CN104467117A - Charging method and device and charger - Google Patents
Charging method and device and charger Download PDFInfo
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- CN104467117A CN104467117A CN201410852049.XA CN201410852049A CN104467117A CN 104467117 A CN104467117 A CN 104467117A CN 201410852049 A CN201410852049 A CN 201410852049A CN 104467117 A CN104467117 A CN 104467117A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E60/10—Energy storage using batteries
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Abstract
The invention discloses a charging method and device and a charger. The charging method includes the steps that when a signal, representing a needed voltage value, transmitted by equipment to be charged is received, the current needed voltage value of the equipment to be charged is obtained; according to the needed voltage value of the equipment to be charged, the output voltage of the charger is adjusted; a signal representing a current rated output current value is transmitted to the equipment to be charged so that the equipment to be charged can adjust a preset charging current value of the equipment to be charged according to the current rated output current value, and charging can be performed at an adjusted charging current value. By the adoption of the charging method and device and the charger, the charging capacity of the charger can be sufficiently utilized for achieving rapid charging.
Description
Technical field
The present invention relates to charging field, particularly relate to a kind of charging method, device and charger.
Background technology
In existing GB charger, the output voltage of charger is 5V, and output current is then different and different according to the nominal value of charger, is generally between 300mA ~ 1800mA.
Existing USB GB charger generally comprises four ports: VBUS port, DP port, DM port and GND port, and wherein, VBUS port is the output port of charger, and DP port and DM port are two signal ports of USB interface.By charger to charging equipment, such as, when the mobile terminals such as mobile phone charge, by detecting DM and the DP port of charger, whether short circuit judges whether current charger is GB charger to charging equipment.When determining that current charger is GB charger, charging equipment charges according to the fixing output voltage preset.
But due to the size of the no matter output voltage of charger in such scheme, charging equipment all adopts fixing output voltage to charge, and in some cases, cannot make full use of the charging ability of charger.
Summary of the invention
The problem that the embodiment of the present invention solves is the charging ability how making full use of charger, realizes quick charge.
For solving the problem, the embodiment of the present invention provides a kind of charging method, comprising:
When receiving the signal of the expression demand voltage value that charging equipment sends, obtain described charging equipment current demand magnitude of voltage;
According to the demand voltage value of described charging equipment, the output voltage of adjustment charger;
The signal representing current nominal output current value is sent to described charging equipment, make described charging equipment adjust the preset charged current value of described charging equipment according to described current nominal output current value, and charge with the charging current value after adjustment.
Optionally, described in receive the signal of expression demand voltage value that charging equipment sends, obtain described charging device current demand magnitude of voltage, comprising:
Receive the PWM ripple that described charging equipment sends, the duty ratio of a described PWM ripple is corresponding with described demand voltage value;
Obtain the duty ratio of a described PWM ripple, according to the magnitude of voltage preset and the corresponding relation of PWM ripple duty ratio, obtain described charging device current demand magnitude of voltage.
Optionally, the described demand voltage value according to described charging equipment, the output voltage of adjustment charger, comprise: when the demand voltage value of described charging equipment is greater than the maximum output voltage of described charger, the output voltage of described charger is adjusted to the maximum output voltage of described charger.
Optionally, in the demand voltage value according to described charging equipment, after the output voltage of adjustment charger, also comprise: obtain the output-current rating value corresponding with the charger output voltage after described adjustment, and the signal of the output-current rating value representing described correspondence is sent to described charging equipment, make described charging equipment obtain described current nominal output current value, adjust the preset charged current value of described charging equipment, and charge with the charging current value after adjustment.
Optionally, the described signal sending expression current nominal output current value to described charging equipment, make described charging equipment adjust the preset charged current value of described charging equipment according to described current nominal output current value, and charge with the charging current value after adjustment, comprising:
The 2nd PWM ripple is sent to described charging equipment, the duty ratio of described 2nd PWM ripple is corresponding with the current nominal output current value of described charger, make described charging equipment according to the current value preset and the corresponding relation of PWM ripple duty ratio, obtain the current nominal output current value of described charger, adjust the preset charged current value of described charging equipment according to described current nominal output current value, and charge with the charging current value after adjustment.
Optionally, before the signal receiving the expression demand voltage value that charging equipment sends, also comprise: receive the detection signal that described charging equipment sends, corresponding feedback signal is sent to described charging equipment, making described charging equipment when receiving described feedback signal, sending the signal representing demand voltage value.
Optionally, in the demand voltage value according to described charging equipment, after the output voltage of adjustment charger, also comprise: when the signal of expression demand voltage value that described charging equipment sends not detected, the output voltage of charger is reset to acquiescence output voltage values.
Optionally, described charging equipment comprises following at least one: mobile terminal, charger baby.
For solving the problem, the embodiment of the present invention additionally provides a kind of charging device, comprising:
Acquiring unit, for when receiving the signal of the expression demand voltage value that charging equipment sends, obtains described charging equipment current demand magnitude of voltage;
Adjustment unit, for the demand voltage value according to described charging equipment, the output voltage of adjustment charger;
Transmitting element, for sending the signal representing current nominal output current value to described charging equipment, make described charging equipment adjust the preset charged current value of described charging equipment according to described current nominal output current value, and charge with the charging current value after adjustment.
Optionally, the PWM ripple that described acquiring unit sends for receiving described charging equipment, the duty ratio of a described PWM ripple is corresponding with described demand voltage value; Obtain the duty ratio of a described PWM ripple, according to the magnitude of voltage preset and the corresponding relation of PWM ripple duty ratio, obtain described charging device current demand magnitude of voltage.
Optionally, described adjustment unit is used for when the demand voltage value of described charging equipment is greater than the maximum output voltage of described charger, the output voltage of described charger is adjusted to the maximum output voltage of described charger.
Optionally, described transmitting element also for: obtain the output-current rating value corresponding with the charger output voltage after described adjustment, and the signal of the output-current rating value representing described correspondence is sent to described charging equipment, described charging equipment is made to obtain described current nominal output current value, adjust the preset charged current value of described charging equipment, and charge with the charging current value after adjustment.
Optionally, described transmitting element is used for sending the 2nd PWM ripple to described charging equipment, the duty ratio of described 2nd PWM ripple is corresponding with the current nominal output current value of described charger, make described charging equipment according to the current value preset and the corresponding relation of PWM ripple duty ratio, obtain the current nominal output current value of described charger, adjust the preset charged current value of described charging equipment according to described current nominal output current value, and charge with the charging current value after adjustment.
Optionally, described charging device also comprises: reset cell, for when the signal of expression demand voltage value that described charging equipment sends not detected, the output voltage of charger is reset to acquiescence output voltage values.
The embodiment of the present invention additionally provides a kind of charger, comprising: comprise PWM feedback circuit, electric pressure converter and PWM output circuit, wherein:
Described PWM feedback circuit, is suitable for the PWM ripple receiving charging equipment transmission, obtains the demand voltage value of described charging equipment corresponding to a described PWM ripple;
Described electric pressure converter, is suitable for the current demand magnitude of voltage according to described charging equipment, adjusts the output voltage of described charger;
Described PWM output circuit, be suitable for the corresponding relation according to the current value preset and PWM ripple duty ratio, the current nominal output current value of described charger is converted to the 2nd PWM ripple of duty ratio corresponding, and be sent to described charging equipment, described charging equipment is made to obtain described current nominal output current value, adjust the preset charged current value of described charging equipment, and charge with the charging current value after adjustment.
Optionally, described charger also comprises: control circuit and switching circuit, wherein:
Described control circuit, is suitable for, when the detection signal receiving the transmission of described charging equipment reaches preset duration, sending open command to described switching circuit;
Described switching circuit, is arranged between the DP port of described charger and DM port, is suitable for, when receiving the open command that described control circuit sends, disconnecting the connection between described DP port and described DM port.
Optionally, described electric pressure converter is AC-DC converter or dc-dc.
Optionally, when described electric pressure converter is AC-DC converter, isolator is set between described AC-DC converter and described PWM feedback circuit, is suitable for described AC-DC converter and described PWM feedback circuit physical isolation.
Optionally, described isolator is Light Coupled Device.
Optionally, described PWM feedback circuit comprises: sample circuit, is suitable for sampling to a described PWM ripple, to obtain the duty ratio of a described PWM ripple.
Optionally, described sample circuit comprises adc circuit.
Optionally, described PWM feedback circuit comprises: low pass filter; With ADC or the operation amplifier circuit of described low pass filter coupled.
Optionally, described low pass filter comprise following any one: low-pass first order filter, second-order low-pass filter.
Optionally, described PWM output circuit comprises: comparator; The saw-toothed wave generator coupled with described comparator input terminal.
Embodiments provide a kind of charging method, comprising:
When receiving the signal representing demand voltage value, obtain described current demand magnitude of voltage;
According to described demand voltage value, the output voltage of adjustment charger;
Send the signal representing current nominal output current value.
Optionally, described when receiving the signal representing demand voltage value, obtain described current demand magnitude of voltage, comprising: receive a PWM ripple, the duty ratio of a described PWM ripple is corresponding with described demand voltage value; Obtain the duty ratio of a described PWM ripple, according to the magnitude of voltage preset and the corresponding relation of PWM ripple duty ratio, obtain described demand voltage value.
Optionally, described according to described demand voltage value, the output voltage of adjustment charger, comprising: when described demand voltage value is greater than the maximum output voltage of described charger, the output voltage of described charger is adjusted to the maximum output voltage of described charger.
Optionally, the described signal sending expression current nominal output current value, comprising: send the 2nd PWM ripple, the duty ratio of described 2nd PWM ripple is corresponding with the current nominal output current value of described charger.
Optionally, described charging equipment comprises following at least one: mobile terminal, charger baby.
The embodiment of the present invention additionally provides a kind of charging device, comprising:
Acquiring unit, for when receiving the signal representing demand voltage value, obtains described charging equipment current demand magnitude of voltage;
Adjustment unit, for the demand voltage value according to described charging equipment, the output voltage of adjustment charger;
Transmitting element, for sending the signal representing current nominal output current value.
Optionally, described acquiring unit is used for receiving a PWM ripple, obtains the duty ratio of a described PWM ripple, according to the magnitude of voltage preset and the corresponding relation of PWM ripple duty ratio, obtains described demand voltage value.
Optionally, described adjustment unit is used for when described demand voltage value is greater than the maximum output voltage of described charger, the output voltage of described charger is adjusted to the maximum output voltage of described charger.
Optionally, described transmitting element is for sending the 2nd PWM ripple, and the duty ratio of described 2nd PWM ripple is corresponding with the current nominal output current value of described charger.
The embodiment of the present invention additionally provides a kind of charger, comprises PWM feedback circuit, electric pressure converter and PWM output circuit, wherein:
Described PWM feedback circuit, is suitable for reception the one PWM ripple, obtains the demand voltage value that a described PWM ripple is corresponding;
Described electric pressure converter, is suitable for, according to described demand voltage value, adjusting the output voltage of described charger;
Described PWM output circuit, is suitable for the corresponding relation according to the current value preset and PWM ripple duty ratio, the current nominal output current value of described charger is converted to the 2nd PWM ripple of duty ratio corresponding and send.
Optionally, described electric pressure converter is AC-DC converter or dc-dc.
Optionally, when described electric pressure converter is AC-DC converter, isolator is set between described AC-DC converter and described PWM feedback circuit, is suitable for described AC-DC converter and described PWM feedback circuit physical isolation.
Optionally, described isolator is Light Coupled Device.
Optionally, described PWM feedback circuit comprises: sample circuit, is suitable for sampling to a described PWM ripple, to obtain the duty ratio of a described PWM ripple.
Optionally, described sample circuit comprises adc circuit.
Optionally, described PWM feedback circuit comprises: low pass filter; With ADC or the operation amplifier circuit of described low pass filter coupled.
Optionally, described low pass filter comprise following any one: low-pass first order filter, second-order low-pass filter.
Optionally, described PWM output circuit comprises: comparator; The saw-toothed wave generator coupled with described comparator input terminal.
Compared with prior art, the technical scheme of the embodiment of the present invention has the following advantages:
Sent the signal representing demand voltage by charging equipment to charger, adjust the output voltage of charger, make charger export higher voltage, the power output of charger increases, and the power be namely input in charging equipment increases.And the charging current of charging equipment and the power proportional be input in charging equipment, therefore the power output increase of charger can improve charging current, realizes quick charge.
The current nominal output current value of charger is obtained by charging equipment, charging current is adjusted, instead of only charge with fixing preset charged current value, when the charging current value that the current nominal output current value of charger is corresponding is greater than the charging current of fixing of charging equipment, the charging current of adjustment charging equipment, the charging current value after adjusting is made to be greater than fixing preset charged current value, the output current of charger can be made full use of, thus realize charging more fast.
Accompanying drawing explanation
Fig. 1 is the flow chart of a kind of charging method in the embodiment of the present invention;
Fig. 2 is the structural representation of a kind of charging device in the embodiment of the present invention;
Fig. 3 is the structural representation of a kind of charger in the embodiment of the present invention;
Fig. 4 is the structural representation of a kind of PWM feedback circuit in the embodiment of the present invention;
Fig. 5 is the structural representation of the another kind of PWM feedback circuit in the embodiment of the present invention;
Fig. 6 is the structural representation of a kind of PWM output circuit in the embodiment of the present invention;
Fig. 7 is the structural representation of the another kind of charger in the embodiment of the present invention;
Fig. 8 is the flow chart of the another kind of charging method in the embodiment of the present invention.
Embodiment
Adopt USB charger be charging equipment charge time, charging equipment according to preset fixing output voltage charge.Such as, and when the output voltage of charger is adjustable, the output voltage range of charger is 5V ~ 20V, and charger only exports with fixing 5V voltage, cannot make full use of the fan-out capability of charger, cause charge efficiency lower.
In embodiments of the present invention, sent the signal representing demand voltage by charging equipment to charger, the output voltage of charger is adjusted, make charger export higher voltage, the power output of charger increases, and the power be namely input in charging equipment increases.And the charging current of charging equipment and the power proportional be input in charging equipment, therefore the power output increase of charger can improve charging current, realizes quick charge.
For enabling above-mentioned purpose, the feature and advantage of the embodiment of the present invention more become apparent, below in conjunction with accompanying drawing, specific embodiments of the invention are described in detail.
Embodiments provide a kind of charging method, with reference to Fig. 1, be described in detail below by way of concrete steps.
Step S101, when receiving the signal of the expression demand voltage value that charging equipment sends, obtains described charging equipment current demand magnitude of voltage.
In concrete enforcement, charging equipment can the equipment of device of storage of electrical energy for including arbitrarily, and charger can for comprising arbitrarily the charger of USB interface.Such as, charging equipment can be mobile phone terminal, panel computer etc., and also can be that charger baby, portable power source etc. can the equipment of storage of electrical energy, can also be other equipment, can the device of storage of electrical energy as long as comprise, and does not repeat herein.
In embodiments of the present invention, in charging process, charging equipment can detect the current output voltage value of charger in real time.When detecting that the current output voltage value of charger is less, such as, when the output voltage of charger is only 5V, for realizing quick charge, charging equipment can send the request signal of a Voltage Cortrol to charger, can comprise the signal of the demand voltage value representing charging equipment in request signal.Charger, when receiving the signal of the expression demand voltage value that charging equipment sends, obtains the demand voltage of charging equipment, and performs step S102 from this signal.
In embodiments of the present invention, the output voltage values of charger can be between 5V ~ 20V, such as, can be 5V, 9V, 12V, 20V etc.Corresponding to different chargers, when output voltage values is different, the output-current rating value of charger can be equal, also can be unequal.
Such as, corresponding to a certain charger, its power output is fixed, and therefore, when the output voltage of charger changes, corresponding change occurs corresponding output-current rating value.And for example, corresponding to another charger, its power output is variable, and corresponding output-current rating value can be fixed value, does not change with the change of the output voltage of charger.And for example, corresponding to another charger, its power output is variable, and the output-current rating value of charger can be fixed value within the scope of certain voltage, can change with voltage and change in other voltage ranges.
Corresponding to the charger that power output is variable, the output voltage of adjustment charger, means and adjusts the power output of charger.When being heightened by the output voltage of charger, the corresponding increase of power output of charger, means that the power being input to charging equipment increases.Due to charging current and the power proportional being input to charging equipment of charging equipment, therefore, the increase of the power output of charger causes the charging current of charging equipment to increase.
Corresponding to the charger that power output is fixing, the output voltage of adjustment charger, although the power output of charger does not change, according to P=I
2r, the power consumed on the equivalent electric circuit of electric power transfer approach reduces, and means that the effective output of charger increases, and correspondingly, the effective power being input to charging equipment increases, therefore, the charging current also corresponding increase of charging equipment.
In embodiments of the present invention, the signal that charging equipment sends to charger can signal to include numerous forms, as long as meet the demand voltage value that charger can get charging equipment.
In an embodiment of the present invention, the signal of the expression demand voltage value of charging equipment transmission is a PWM ripple of certain duty ratio.PWM ripple generating apparatus can be set in charging equipment, according to the corresponding relation of the magnitude of voltage be set in advance in charger and charging equipment and PWM ripple duty ratio, by PWM ripple generating apparatus, the demand voltage value of charging equipment is converted to a PWM ripple of duty ratio corresponding, and a PWM ripple is sent to charger.
In an embodiment of the present invention, the PWM ripple generating apparatus arranged in charging equipment comprises comparator and saw-toothed wave generator, and comparator, by comparing the magnitude of voltage of two input inputs, exports corresponding high level or low level.According to the corresponding relation of magnitude of voltage and the PWM ripple duty ratio preset, the duty ratio of the PWM ripple that the demand voltage value of acquisition charging equipment is corresponding.The first input end input sawtooth waveforms of comparator, the second input inputs a corresponding magnitude of voltage V1, by comparing the magnitude of voltage that magnitude of voltage V1 is corresponding with sawtooth waveforms in the same time mutually, exports high level or low level.By adjustment magnitude of voltage V1, namely produce a PWM ripple of duty ratio corresponding by comparator.
In an embodiment of the present invention, the corresponding relation of magnitude of voltage V1 and PWM ripple duty ratio can be set up in advance, such as, PWM ripple duty ratio corresponding during magnitude of voltage V1=1.6V is 80%, PWM ripple duty ratio corresponding during magnitude of voltage V1=1.2V is 60% etc., thus, when the duty ratio of a PWM ripple corresponding to the demand voltage value getting charging equipment is 60%, the magnitude of voltage V1=1.2V of the second input input of comparator, thus generate the PWM ripple that duty ratio is 60%.
In other embodiments of the present invention, the PWM ripple generating apparatus arranged in charging equipment also can be that other can generate the device of PWM ripple, does not repeat herein.
PWM wave receiving device can be set at charger end, a PWM ripple of charging equipment transmission is received by PWM wave receiving device, obtain the duty ratio that a PWM ripple is corresponding, according to the corresponding relation of magnitude of voltage and PWM ripple duty ratio, the demand voltage value of charging equipment can be obtained.
In an embodiment of the present invention, the PWM ripple signal that the PWM ripple generating apparatus that charging equipment end is arranged generates is exported by the DP port of charging inlet, and the PWM wave receiving device of charger end receives a PWM ripple of PWM ripple generating apparatus output on the DP port of USB charger.
With reference to table 1, give the mapping table of a kind of magnitude of voltage in the embodiment of the present invention and PWM ripple duty ratio.
| Magnitude of voltage | PWM ripple duty ratio |
| 20V | 80％ |
| 15V | 60％ |
| 12V | 48％ |
| 9V | 36％ |
| 7V | 28％ |
| 5V | 20％ |
Table 1
Such as, the demand voltage value of charging equipment is 12V, known according to table 1, and the PWM ripple duty ratio that 12V is corresponding is 48%.Charging equipment sends to charger the PWM ripple that a duty ratio is 48%.Charger is after the PWM ripple receiving charging equipment transmission, and the duty ratio being obtained PWM ripple by PWM wave receiving device is 48%.According to table 1, table look-up and can know that the demand voltage value of charging equipment is 12V, perform step S102.
Step S102, according to the demand voltage value of described charging equipment, the output voltage of adjustment charger.
In concrete enforcement, charger, after getting the demand voltage value of charging equipment, first can judge whether the demand voltage value of charging equipment is within the operating voltage range of charger.When the demand voltage value of charging equipment is within the rated operational voltage scope of charger, output voltage can be adjusted to the demand voltage of charging equipment by charger.
Such as, the rated operational voltage of charger is 20V, and the demand voltage value of the charging equipment received is 12V, and because demand voltage value is within the rated operational voltage scope of charger, therefore current output voltage can be adjusted to 12V by charger.
When the demand voltage value of charging equipment is greater than within the rated operational voltage scope of charger, charger can not adjust output voltage, also output voltage can be adjusted to rated operational voltage.
Such as, the rated operational voltage of charger is 20V, the demand voltage value of the charging equipment received is 25V, due to 25V > 20V, namely the demand voltage value of charging equipment is greater than the rated operational voltage of charger, therefore current output voltage can be adjusted to rated operational voltage by charger, is adjusted to 20V by current output voltage.
Step S103, the signal representing current nominal output current value is sent to described charging equipment, make described charging equipment adjust the preset charged current value of described charging equipment according to described current nominal output current value, and charge with the charging current value after adjustment.
In concrete enforcement, charger is when to charging equipment output current, and the current value of output can be the output-current rating value of charger.Charger, while charging equipment output current, can send to charging equipment the signal representing current nominal output current value, make charging equipment upon receipt of the signal, can obtain the current nominal output current value of charger.The signal that charger sends to charging equipment can signal to include numerous forms, as long as meet the current nominal output current value that charging equipment can obtain charger.
In embodiments of the present invention, when charger is in holding state, the DP port of charger and DM port short circuit.Charger detects the magnitude of voltage on DP port in real time, when detecting that the duration of the magnitude of voltage on DP port higher than preset voltage value reaches preset duration, DM port and DP port disconnect by charger, are sent the signal representing current nominal output current value by DM port to charging equipment.
In an embodiment of the present invention, charger detects the magnitude of voltage on DP port in real time.When charging equipment is connected with charger, charging equipment sends signal to charger, such as, send the mode of request signal or enable signal, the voltage on the DP port of charger is raised.When the duration that the voltage on DP port is elevated to Vth reaches preset duration, the DM port of short circuit and DP port disconnect by charger, and are sent the signal representing current nominal output current value to charging equipment by DM port.
In embodiments of the present invention, according to step S101 ~ step S102, charger is after adjusting output voltage, and the output-current rating value before the output-current rating value that the output voltage values after adjustment is corresponding can adjust with output voltage is equal, also can not wait.That is, when the output-current rating value of charger changes with the change of output voltage values, can by controlling the output voltage values of charger to control the output-current rating value of charger.After the output voltage values of charger has adjusted, charger has sent the signal of the output-current rating value representing corresponding with the output voltage values after adjustment to charging equipment.
Such as, the output voltage of charger is 5V, and corresponding output-current rating value is 2A.After the signal receiving the expression demand voltage value that charging equipment sends, the output voltage of charger is adjusted to 9V, the output-current rating value that 9V is corresponding is 1.5A, then, after output voltage has adjusted, it is the signal of 1.5A that charger sends current nominal output current value to charging equipment.
In an embodiment of the present invention, the signal of the expression current nominal output current value of charger transmission is the 2nd PWM ripple of certain duty ratio.PWM ripple generating apparatus is set in charger, according to the current value preset and the corresponding relation of PWM ripple duty ratio, the current nominal output current value of charger is converted to the 2nd PWM ripple of duty ratio corresponding, and the 2nd PWM ripple is sent to charging equipment.When the output-current rating value of charger changes with the change of output voltage, the 2nd PWM ripple that charger sends to charging equipment also can change with the change of output voltage.
In an embodiment of the present invention, the PWM ripple generating apparatus arranged in charger comprises comparator and saw-toothed wave generator, and comparator compares the magnitude of voltage of two input inputs, exports corresponding high level or low level.According to the corresponding relation of current value and the PWM ripple duty ratio preset, the duty ratio of the 2nd PWM ripple that the current nominal output current value of acquisition charger is corresponding.Saw-toothed wave generator generates sawtooth waveforms and is input to the first input end of comparator, at the second end input voltage value V2 of comparator, by comparing the magnitude of voltage that V2 is corresponding with sawtooth waveforms in the same time mutually, exports high level or low level.By adjustment magnitude of voltage V2, namely produce the 2nd PWM ripple of duty ratio corresponding by comparator.
In an embodiment of the present invention, the corresponding relation of magnitude of voltage V2 and PWM ripple duty ratio can be set up in advance, such as, PWM ripple duty ratio corresponding during magnitude of voltage V2=1.6V is 80%, PWM ripple duty ratio corresponding during magnitude of voltage V2=1.2V is 60% etc., thus, when the duty ratio of the 2nd PWM ripple corresponding to the output-current rating value getting current charger is 80%, the magnitude of voltage V2=1.6V of the second input input of comparator, thus generate the 2nd PWM ripple that duty ratio is 80%.
In other embodiments of the present invention, the PWM ripple generating apparatus in charger also can be that other can generate the device of PWM ripple, does not repeat herein.
PWM wave receiving device can be set at charging equipment end, receive the 2nd PWM ripple of charger transmission at PWM wave receiving device after, obtain the duty ratio that the 2nd PWM ripple is corresponding, according to the current value preset and the corresponding relation of PWM ripple duty ratio, the current nominal output current value of charger can be obtained.
The maximum current bearing capacity of setting generic USB interface is maxoutA, be the current value of 100% correspondence as PWM ripple duty ratio using maxoutA, charger current nominal output current value is maxA, and maxA < maxoutA, be then (maxA/maxoutA) × 100% by the duty ratio of PWM ripple corresponding for current nominal output current value.Charging equipment, after the PWM ripple receiving charger transmission, can obtain the duty ratio of the PWM ripple received, the corresponding relation of the current value preset according to charger end and PWM ripple duty ratio, can know the current nominal output current value of charger.
Such as, the maximum current bearing capacity of generic USB interface is 2.5A, charger current nominal output current value and load current value are 2A, then the duty ratio of the PWM ripple that current nominal output current value is corresponding is: 2/2.5 × 100%=80%, and namely charger sends to charging equipment the PWM ripple that duty ratio is 80%.Charging equipment is after receiving the PWM ripple that charger sends, and the duty ratio getting PWM ripple is 80%, according to the current value preset and the corresponding relation of PWM ripple duty ratio, can know that charger current nominal output current value is 2A.
In other embodiments of the present invention, PWM ripple duty ratio corresponding to charger current nominal output current value can also be obtained by other compute mode, not repeat herein.
In embodiments of the present invention, the charging modes for charging equipment is different, when the output current value of charger is identical, and the charging current I of corresponding charging equipment
cHGcan not be identical.In actual applications, the charging modes of charging equipment can charge for switching regulator.When the charging modes of charging equipment is switching regulator charging, I
cHGrelevant to the conversion efficiency of the DCDC in charging equipment.
At the charging current value I that the output-current rating value getting charger is corresponding
cHGafterwards, can by I
cHGwith the preset charged current value I of charging equipment
0compare.Work as I
cHG> I
0time, the preset charged electric current of charging equipment can be adjusted to I
cHGor be slightly less than I
cHG, and with I
cHGor be slightly less than I
cHGcurrent value charge, thus realize quick charge.Work as I
cHG≤ I
0time, can with I
cHGor be slightly less than I
cHGcurrent value charge, thus protection charger, and quick charge in situation as much as possible.
In an embodiment of the present invention, be charged as example with existing switching regulator, the charging current of adjustment charging equipment is described.
Charging equipment obtains charger current nominal output current value I
vBUSand current output voltage value U
vBUS, calculating charger current output power value is Pc=I
vBUS× U
vBUS.According to the design conditions of charging equipment, such as, in the charging equipment efficiency eta of DCDC, according to P=I
cHG× U
dCDC=I
vBUS× U
vBUS× η, can calculate the charging current value I of the charging equipment corresponding with current charger output-current rating value
cHG.
Such as, charger current nominal output current value I
vBUS=2A, charger current output voltage value U
vBUS=5V, then charger current output power value is Pc=I
vBUS× U
vBUS=10W.Efficiency eta=80% of DCDC in charging equipment, the preset charged current value I of charging equipment
0=600mA.According to P=I
cHG× U
dCDC=I
vBUS× U
vBUS× η, can calculate the charging current value I corresponding with current charger output-current rating value
cHG.In actual applications, U
dCDCcan be adjusted by the charge loop of charging equipment, adjust to and can maintain corresponding charging current.Such as, U
dCDCcan obtain by measuring, such as, the U got
dCDC=4V, then I
cHG=2A, I
cHG=2A > I
0=600mA, is adjusted to 2A by the preset charged current value of charging equipment.
Be understandable that, in actual applications, sequencing direct, unfixing between step S103 and step S101.Before step S101 performs, first can perform step S103, also after step S101 ~ step S102 is complete, step S103 can be performed again.
In an embodiment of the present invention, the 2nd PWM ripple signal that the PWM ripple generating apparatus that charger end is arranged generates can be exported by the DM port of USB charger, and the PWM wave receiving device of charging equipment end can receive the 2nd PWM ripple of PWM ripple generating apparatus output on the DM port of charging inlet.
As can be seen here, sent the signal representing demand voltage, adjust the output voltage of charger by charging equipment to charger, make charger export higher voltage, the power output of charger increases, and the power be namely input in charging equipment increases.And the charging current of charging equipment and the power proportional be input in charging equipment, therefore the power output increase of charger can improve charging current, realizes quick charge.
In addition, sent the signal representing current nominal output current value to charging equipment by charger, make charging equipment obtain the current nominal output current value of charger, and charging current is adjusted, instead of only charge with fixing preset charged current value.When the charging current value that the current nominal output current value of charger is corresponding is greater than the charging current of fixing of charging equipment, the charging current of adjustment charging equipment, the charging current value after adjusting is made to be greater than fixing preset charged current value, the output current of charger can be made full use of, thus realize charging more fast.
In embodiments of the present invention, before charging equipment represents the signal of demand voltage value to charger transmission, when charger is in holding state, the DP port of charger and DM port short circuit.Charging equipment can send detection signal by DM port to charger, and DM port exists voltage.Due to DM port and DP port short circuit, therefore, the voltage on DP port is equal with the voltage on DM port.Charger detects the magnitude of voltage on DP port in real time, when detecting that the duration of the magnitude of voltage on DP port higher than preset voltage value reaches preset duration, DM port and DP port disconnect by charger, voltage on DP port is 0, now, charging equipment can send to charger the signal representing demand voltage value.
In an embodiment of the present invention, when charging equipment is connected with charger, charging equipment sends detection signal by DM port to charger, such as, send the mode of request signal or enable signal, the voltage on the DM port of charger is raised.Because DM port and DP port couple, the voltage therefore on DP port is equal with the voltage on DM port.Charger detects the magnitude of voltage on DP port in real time.When the duration that the voltage on DP port is elevated to Vth reaches preset duration, the DM port of short circuit and DP port disconnect by charger, and the voltage now on DP port is 0, and now, charging equipment can send to charger the signal representing demand voltage value.
In concrete enforcement, at the signal of the expression demand voltage value that charger sends according to charging equipment, output voltage is adjusted.Terminate in charging process, such as, when the charging inlet of charging equipment and charger disconnects, the output voltage values of charger can be adjusted to a higher magnitude of voltage, and such as, at the end of charging, the output voltage values of charger is 12V.When charger charges for another charging equipment again, output voltage values due to charger is 12V, and the specified input voltage value of charging equipment is 5V, then cannot be charged to this charging device by charger, even cause damage to charging equipment.
For solving the problem, in embodiments of the present invention, when charger does not detect the signal of the expression demand voltage value that charging equipment sends, judge that current charging equipment and charger disconnect, therefore, charger can be reverted to initial condition, the voltage of charger is reset to acquiescence output voltage values.
With reference to Fig. 2, the embodiment of the present invention additionally provides a kind of charging device 20, comprising: acquiring unit 201, adjustment unit 202 and transmitting element 203, wherein:
Acquiring unit 201, for when receiving the signal of the expression demand voltage value that charging equipment sends, obtains described charging equipment current demand magnitude of voltage;
Adjustment unit 202, for the demand voltage value according to described charging equipment, the output voltage of adjustment charger;
Transmitting element 203, for sending the signal representing current nominal output current value to described charging equipment, make described charging equipment obtain described current nominal output current value, adjust the preset charged current value of described charging equipment, and charge with the charging current value after adjustment.
In concrete enforcement, described acquiring unit 201 may be used for the PWM ripple receiving the transmission of described charging equipment, and the duty ratio of a described PWM ripple is corresponding with described demand voltage value; Obtain the duty ratio of a described PWM ripple, according to the magnitude of voltage preset and the corresponding relation of PWM ripple duty ratio, obtain described charging device current demand magnitude of voltage.
In concrete enforcement, described adjustment unit 202 may be used for, when the demand voltage value of described charging equipment is greater than the maximum output voltage of described charger, the output voltage of described charger being adjusted to the maximum output voltage of described charger.
In concrete enforcement, described transmitting element 203 can also be used for obtaining the output-current rating value corresponding with the charger output voltage after described adjustment, and the signal of the output-current rating value representing described correspondence is sent to described charging equipment, described charging equipment is made to obtain described output-current rating value, adjust the preset charged current value of described charging equipment, and charge with the charging current value after adjustment.
In concrete enforcement, described transmitting element 203 may be used for sending the 2nd PWM ripple to described charging equipment, the duty ratio of described 2nd PWM ripple is corresponding with the current nominal output current value of described charger, make described charging equipment according to the current value preset and the corresponding relation of PWM ripple duty ratio, obtain the current nominal output current value of described charger, adjust the preset charged current value of described charging equipment according to described current nominal output current value, and charge with the charging current value after adjustment.
In concrete enforcement, described charging device can also comprise: reset cell, for when the signal of expression demand voltage value that described charging equipment sends not detected, the output voltage of charger is reset to acquiescence output voltage values.
With reference to Fig. 3, the embodiment of the present invention additionally provides a kind of charger 30, comprising: PWM feedback circuit 301, electric pressure converter 302 and PWM output circuit 303, wherein:
Described PWM feedback circuit 301, is suitable for the PWM ripple receiving charging equipment transmission, obtains the demand voltage value of charging equipment corresponding to a described PWM ripple.
In embodiments of the present invention, in charging process, can send by charging equipment the PWM ripple representing demand voltage value to charger.Demand voltage value according to the magnitude of voltage preset and the corresponding relation of PWM ripple duty ratio, can be converted to a PWM ripple of duty ratio corresponding, and is sent to charger by charging equipment.
Such as, the demand voltage value of charging equipment is 12V, and according to the corresponding relation of magnitude of voltage and the PWM ripple duty ratio preset, the PWM ripple duty ratio that 12V is corresponding is 48%, and therefore charging equipment is the PWM ripple of 48% to charger transmission duty ratio.
Charger detects the duty ratio of a PWM ripple by PWM feedback circuit 301, according to the magnitude of voltage preset and the corresponding relation of PWM ripple duty ratio, can know the demand voltage value of charging equipment, and demand voltage value is sent to electric pressure converter 302.
In embodiments of the present invention, PWM feedback circuit 301 can comprise sample circuit, is sampled to a PWM ripple by sample circuit, thus can obtain the duty ratio of a PWM ripple, and then obtains the demand voltage value of charging equipment corresponding to a PWM ripple.
Such as, in an embodiment of the present invention, sample circuit can comprise high frequency clock circuit, produces high-frequency impulse by high frequency clock, carries out step-by-step counting to the high level of a PWM ripple and low level.The umber of pulse corresponding according to high level and umber of pulse corresponding to low level, can know the duty ratio of a PWM ripple.The magnitude of voltage that basis is default again and the corresponding relation of PWM ripple duty ratio, can know the demand voltage value of charging equipment, and demand voltage value is sent to electric pressure converter 302.
PWM feedback circuit 301 can also be the circuit of other types.In an embodiment of the present invention, PWM feedback circuit 301 comprises low pass filter and the ADC with low pass filter coupled, by low pass filter, the one PWM ripple is converted to the direct current signal of corresponding voltage value, obtain magnitude of voltage corresponding to direct current signal by ADC, and magnitude of voltage corresponding for direct current signal is sent to electric pressure converter 302.
With reference to Fig. 4, give the structural representation of a kind of PWM feedback circuit in the embodiment of the present invention, comprising: low pass filter and an ADC, low pass filter is made up of resistance R1 and electric capacity C1.Below the workflow of said PWM feedback circuit is illustrated.
The duty ratio of the one PWM ripple is 60%, and corresponding magnitude of voltage is 15V.The high level of the one PWM ripple is 3V, and low level is 0V.Carry out filtering by low pass filter to a PWM ripple, convert a PWM ripple to a direct current signal, and be sent to ADC, the magnitude of voltage of direct current signal is 3V × 60%=1.8V.The voltage that ADC collects the direct current signal of current input is 1.8V, can know that the duty ratio of a PWM ripple is 60%, according to the magnitude of voltage preset and the corresponding relation of PWM ripple duty ratio, can know that the magnitude of voltage that a PWM ripple is corresponding is 15V, sending magnitude of voltage corresponding to a PWM ripple to electric pressure converter 302 is the signal of 15V.
In an alternative embodiment of the invention, PWM feedback circuit 301 comprises low pass filter and the operational amplifier with low pass filter coupled.By low pass filter, the one PWM ripple is converted to the direct current signal of corresponding voltage value, by operational amplifier, in proportion convergent-divergent is carried out to the magnitude of voltage of direct current signal, magnitude of voltage after convergent-divergent is within the working range of electric pressure converter 302, and is sent to electric pressure converter 302.Such as, by operational amplifier, in proportion convergent-divergent is carried out to the magnitude of voltage of direct current signal, the magnitude of voltage after convergent-divergent is within the working range of the Circuit tuning of electric pressure converter 302.Electric pressure converter 302, according to the ratio transformational relation preset, can know the demand voltage value that a PWM ripple is corresponding.
With reference to Fig. 5, give the structural representation of the another kind of PWM feedback circuit in one embodiment of the invention, comprise: low pass filter and an operation amplifier circuit, low pass filter can be made up of resistance R2 and electric capacity C2, operation amplifier circuit can comprise operational amplifier A 1 and resistance R3 and R4 forms, and is illustrated below to the workflow of said PWM feedback circuit.
The duty ratio of the one PWM ripple is 60%, and corresponding magnitude of voltage is 15V.The high level of the one PWM ripple is 3V, and low level is 0V.Carry out filtering by RC low pass filter to a PWM ripple, convert a PWM ripple to a direct current signal, and be sent to "+" input of operational amplifier A 1, the magnitude of voltage of direct current signal is 3V × 60%=1.8V.The working range of the Circuit tuning of electric pressure converter 302 is 0.5V ~ 1V, then by operational amplifier A 1, the magnitude of voltage of input is scaled to 0.9V, and is input to electric pressure converter 302.When electric pressure converter 302 Circuit tuning be input as 0.9V time, electric pressure converter exports the voltage of 15V.
State on the invention in embodiment, low pass filter can be low-pass first order filter, also can be the low pass filter of second-order low-pass filter or other types.Such as, in an embodiment of the present invention, adopt low-pass first order filter as low pass filter, filtering process is carried out to the PWM ripple received.And in an alternative embodiment of the invention, then adopt second-order low-pass filter as low pass filter.
Be understandable that, in concrete enforcement, the structure of PWM feedback circuit is not limited in several structures provided in the above embodiment of the present invention, other forms of structure can also be comprised, as long as charging equipment demand voltage value corresponding to a PWM ripple can be obtained and be sent to electric pressure converter, do not repeat herein.
Electric pressure converter 302, is suitable for the current demand magnitude of voltage according to described charging equipment, adjusts the output voltage of described charger.
In embodiments of the present invention, electric pressure converter 302 is after the demand voltage value receiving the charging equipment that PWM feedback circuit 301 sends, the output voltage of charger can be adjusted by magnitude of voltage according to demand, make the output voltage of charger meet the demand of charging equipment.
Such as, PWM feedback circuit 301 comprises low pass filter and operational amplifier, and the voltage that the Circuit tuning of electric pressure converter 302 receives is 0.9V, and electric pressure converter 302, according to the corresponding relation preset, exports the voltage of 15V.
And for example, PWM feedback circuit 301 comprises low pass filter and ADC, and the demand voltage value that the ADC that electric pressure converter 302 receives sends charging equipment is the signal of 15V, the output voltage of charger is adjusted to 15V and exports.
In embodiments of the present invention, electric pressure converter 302 can be AC-DC converter, also can be dc-dc.When electric pressure converter is AC-DC converter, because the voltage at PWM feedback circuit 301 two ends is lower, be generally less than and equal 20V, and the magnitude of voltage of AC-DC side is higher, for the sake of security, isolating device can be set between AC-DC converter and PWM feedback circuit, by AC-DC converter and PWM feedback circuit physical isolation, thus the dangerous hidden danger that exists because human body contacts by mistake can be avoided.
In an embodiment of the present invention, isolator is Light Coupled Device.Isolator can also be the device of other types, as long as meet AC-DC change-over circuit and PWM feedback circuit physical isolation, repeats no more herein.
PWM output circuit 303, be suitable for the corresponding relation according to the current value preset and PWM ripple duty ratio, the current nominal output current value of described charger is converted to the 2nd PWM ripple of duty ratio corresponding, and be sent to described charging equipment, control the charging current of described charging equipment.
In concrete enforcement, PWM output circuit 303 can comprise comparator and saw-toothed wave generator, according to the corresponding relation of the current value preset with PWM ripple duty ratio, and the duty ratio of the 2nd PWM ripple that the current nominal output current value of acquisition charger is corresponding.Saw-toothed wave generator generates sawtooth waveforms and is input to the first input end of comparator, at the second end input voltage value V2 of comparator, by comparing the magnitude of voltage that V2 is corresponding with sawtooth waveforms in the same time mutually, exports high level or low level.By adjustment magnitude of voltage V2, namely produce the 2nd PWM ripple of duty ratio corresponding by comparator.
In an embodiment of the present invention, the corresponding relation of magnitude of voltage V2 and PWM ripple duty ratio can be set up in advance, such as, PWM ripple duty ratio corresponding during magnitude of voltage V2=1.6V is 80%, PWM ripple duty ratio corresponding during magnitude of voltage V2=1.2V is 60% etc., thus, when the duty ratio of the 2nd PWM ripple corresponding to the output-current rating value getting current charger is 80%, the magnitude of voltage V2=1.6V of the second input input of comparator, thus generate the 2nd PWM ripple that duty ratio is 80%.
With reference to Fig. 6, give the structural representation of a kind of PWM output circuit 303 in the embodiment of the present invention, comprise comparator A2 and saw-toothed wave generator."-" input of saw-toothed wave generator and comparator A2 couples, and after producing sawtooth waveforms, sawtooth waveforms is sent to comparator A2."+" input of comparator A2 inputs voltage value signal corresponding to load current value, can generate the 2nd PWM ripple by comparator A2.
Such as, the current nominal output current value of charger is 2A, according to the current value preset and the corresponding relation of PWM ripple duty ratio, learn that the PWM ripple duty ratio that 2A is corresponding is 80%, then PWM output circuit 303 produces the 2nd PWM ripple that a duty ratio is 80%, and be sent to charging equipment, make described charging equipment according to the current nominal output current value of charger, charging current value is adjusted accordingly.
In other embodiments of the present invention, PWM output circuit 303 also can be that charger current nominal output current value can be converted to the device of the 2nd PWM ripple of duty ratio corresponding by other, does not repeat herein.
In embodiments of the present invention, after electric pressure converter 302 is according to the output voltage of the demand voltage value adjustment charger of charging equipment, according to the present output power of charger, can obtain after Voltage Cortrol completes, the output-current rating value of corresponding charger, and according to the current value preset and the corresponding relation of PWM ripple duty ratio, the output-current rating value of the charger of correspondence is converted to the 2nd PWM ripple of duty ratio corresponding.
Such as, before the output voltage of charger does not adjust, the output voltage values of charger is 5V, and output-current rating value is 2A, then the duty ratio of the 2nd corresponding PWM ripple is 80%.The output voltage of charger is adjusted, output voltage values after adjustment is 12V, output-current rating value is 1.5A, the duty ratio of the 2nd PWM ripple that the output-current rating value then after adjustment is corresponding is 60%, namely produces a duty ratio by PWM output circuit 303 and is the 2nd PWM ripple of 60% and sends to charging equipment.
Be understandable that, when the output-current rating value of charger changes with the change of output voltage values, by adjusting the output voltage values of charger, can realize adjusting the output-current rating value of charger, thus make PWM output circuit 303 export the two PWM ripple corresponding with current value, to realize making full use of electric current.
In an embodiment of the present invention, PWM feedback circuit 301 is arranged in charger, is connected with the DP port of charger, receives the PWM ripple that charging equipment sends.PWM output circuit 303 is arranged in charger, is connected with the DM port of charger, sends the 2nd PWM ripple by DM port to charging equipment.
In embodiments of the present invention, can also arrange controller and switching circuit in charger, wherein, switching circuit is arranged between the DP port of charger and DM port, is disconnected by controller control switch circuit.
In an embodiment of the present invention, corresponding to GB charger, give tacit consent in charging process, DP port is connected with DM port.Charging equipment, before send the signal representing demand voltage value to charger, sends detection signal to charger.The controller of charger receives detection signal, and when the duration receiving detection signal reaches preset duration, controller control switch circuit disconnects, thus DP port and DM port are disconnected.When charging equipment detects DP port and DM port disconnects, send the signal representing demand voltage value to charger.
With reference to Fig. 7, give the structural representation of a kind of charger in one embodiment of the invention, comprising: PWM feedback circuit 701, AC-DC converter 702, PWM output circuit 703, control circuit 704, isolating device 705, switching power circuit 706 and switching circuit S1.
The PWM feedback circuit 701 of charger, by a PWM ripple of DP port accepts charging equipment transmission, obtains the duty ratio of a PWM ripple, thus obtains current demand magnitude of voltage.Current voltage value signal is sent to AC-DC converter 702 by isolating device 705, AC-DC converter 702 is according to current demand magnitude of voltage, obtain the output voltage of corresponding charger, control switch power circuit 706 is generated corresponding output voltage and is exported by VBUS port.
The two PWM ripple corresponding with charger current nominal output current value is exported, by the disconnection of control circuit 704 control DP port and DM port by PWM output circuit 703.Concrete function and the operation principle of PWM feedback circuit 701, AC-DC converter 702, PWM output circuit 703, control circuit 704, isolating device 705 with reference to the above embodiment of the present invention, can repeat no more herein.
Be understandable that, in embodiments of the present invention, dc-dc can also be adopted to substitute AC-DC converter 702.When adopting dc-dc to substitute AC-DC converter 702, isolating device 705 can correspondingly save.Feedback circuit is set between dc-dc and PWM feedback circuit 701, is fed back the demand voltage value of charging equipment by feedback circuit to DC-DC.
Embodiments provide and additionally provide another kind of charging method, with reference to Fig. 8, be described in detail below by way of concrete steps.
Step S801, when receiving the signal representing demand voltage value, obtains described current demand magnitude of voltage.
In concrete enforcement, the signal of the expression demand voltage value that charger receives is a PWM ripple, and the duty ratio of a PWM ripple is corresponding with demand voltage value.After receiving a PWM ripple, the duty ratio that can obtain a PWM ripple according to the corresponding relation of the magnitude of voltage preset with PWM ripple duty ratio, acquisition demand voltage value.
In embodiments of the present invention, the detailed process obtaining demand voltage value with reference to the step S101 in the above embodiment of the present invention, can not repeat herein.
Step S802, according to described demand voltage value, the output voltage of adjustment charger.
In embodiments of the present invention, after step S801 gets demand voltage value, the maximum output voltage value of demand voltage value and charger can be judged, i.e. the magnitude relationship of the rated output voltage value of charger.When demand voltage value is less than the maximum output voltage value of charger, the output voltage of charger can be adjusted to demand voltage value.When demand voltage value is greater than the maximum output voltage value of charger, the output voltage values of charger can be adjusted to the maximum output voltage of charger.
In embodiments of the present invention, the idiographic flow adjusting the output voltage of charger with reference to the step S102 in the above embodiment of the present invention, can not repeat herein.
Step S803, sends the signal representing current nominal output current value.
In embodiments of the present invention, current nominal output current value can be the second PWM ripple, and the duty ratio of the 2nd PWM ripple is corresponding with the output-current rating value of charger.Idiographic flow current nominal output current value being converted to the 2nd PWM ripple of duty ratio corresponding with reference to the step S103 in the above embodiment of the present invention, can not repeat herein.
Embodiments provide a kind of charging device, with reference to Fig. 2, can comprise:
Acquiring unit, for when receiving the signal representing demand voltage value, obtains described demand voltage value;
Adjustment unit, for according to described demand voltage value, adjusts the output voltage of charger;
Transmitting element, for sending the signal representing current nominal output current value.
In concrete enforcement, described acquiring unit is used for receiving a PWM ripple, obtains the duty ratio of a described PWM ripple, according to the corresponding relation of the magnitude of voltage preset and PWM ripple duty ratio, obtains described demand voltage value.
In concrete enforcement, described adjustment unit is used for when described demand voltage value is greater than the maximum output voltage of described charger, the output voltage of described charger is adjusted to the maximum output voltage of described charger.
In concrete enforcement, described transmitting element is for sending the 2nd PWM ripple, and the duty ratio of described 2nd PWM ripple is corresponding with the current nominal output current value of described charger.
The embodiment of the present invention additionally provides a kind of charger, with reference to Fig. 3, can comprise: PWM feedback circuit, electric pressure converter and PWM output circuit, wherein:
Described PWM feedback circuit, is suitable for reception the one PWM ripple, obtains the demand voltage value that a described PWM ripple is corresponding;
Described electric pressure converter, is suitable for, according to described demand voltage value, adjusting the output voltage of described charger;
Described PWM output circuit, is suitable for the corresponding relation according to the current value preset and PWM ripple duty ratio, the current nominal output current value of described charger is converted to the 2nd PWM ripple of duty ratio corresponding and send.
In concrete enforcement, described electric pressure converter is AC-DC converter or dc-dc.
In concrete enforcement, when described electric pressure converter is AC-DC converter, isolator is set between described AC-DC converter and described PWM feedback circuit, is suitable for described AC-DC converter and described PWM feedback circuit physical isolation.
In concrete enforcement, described isolator is Light Coupled Device.
In concrete enforcement, described PWM feedback circuit comprises: sample circuit, is suitable for sampling to a described PWM ripple, to obtain the duty ratio of a described PWM ripple.
In concrete enforcement, described sample circuit comprises adc circuit.
In concrete enforcement, described PWM feedback circuit comprises: low pass filter; With ADC or the operation amplifier circuit of described low pass filter coupled.
In concrete enforcement, described low pass filter comprise following any one: low-pass first order filter, second-order low-pass filter.
In concrete enforcement, described PWM output circuit comprises: comparator; The saw-toothed wave generator coupled with described comparator input terminal.
One of ordinary skill in the art will appreciate that all or part of step in the various methods of above-described embodiment is that the hardware that can carry out instruction relevant by program has come, this program can be stored in a computer-readable recording medium, and storage medium can comprise: ROM, RAM, disk or CD etc.
Although the present invention discloses as above, the present invention is not defined in this.Any those skilled in the art, without departing from the spirit and scope of the present invention, all can make various changes or modifications, and therefore protection scope of the present invention should be as the criterion with claim limited range.
Claims (41)
1. a charging method, is characterized in that, comprising:
When receiving the signal of the expression demand voltage value that charging equipment sends, obtain described charging equipment current demand magnitude of voltage;
According to the demand voltage value of described charging equipment, the output voltage of adjustment charger;
The signal representing current nominal output current value is sent to described charging equipment, make described charging equipment adjust the preset charged current value of described charging equipment according to described current nominal output current value, and charge with the charging current value after adjustment.
2. charging method as claimed in claim 1, is characterized in that, described in receive the signal of the expression demand voltage value that charging equipment sends, obtain described charging device current demand magnitude of voltage, comprising:
Receive the PWM ripple that described charging equipment sends, the duty ratio of a described PWM ripple is corresponding with described demand voltage value;
Obtain the duty ratio of a described PWM ripple, according to the magnitude of voltage preset and the corresponding relation of PWM ripple duty ratio, obtain described charging device current demand magnitude of voltage.
3. charging method as claimed in claim 1, it is characterized in that, the described demand voltage value according to described charging equipment, the output voltage of adjustment charger, comprise: when the demand voltage value of described charging equipment is greater than the maximum output voltage of described charger, the output voltage of described charger is adjusted to the maximum output voltage of described charger.
4. charging method as claimed in claim 1, it is characterized in that, in the demand voltage value according to described charging equipment, after the output voltage of adjustment charger, also comprise: obtain the output-current rating value corresponding with the charger output voltage after described adjustment, and the signal of the output-current rating value representing described correspondence is sent to described charging equipment, described charging equipment is made to obtain described current nominal output current value, adjust the preset charged current value of described charging equipment, and charge with the charging current value after adjustment.
5. charging method as claimed in claim 1, it is characterized in that, the described signal sending expression current nominal output current value to described charging equipment, described charging equipment is made to adjust the preset charged current value of described charging equipment according to described current nominal output current value, and charge with the charging current value after adjustment, comprising:
The 2nd PWM ripple is sent to described charging equipment, the duty ratio of described 2nd PWM ripple is corresponding with the current nominal output current value of described charger, make described charging equipment according to the current value preset and the corresponding relation of PWM ripple duty ratio, obtain the current nominal output current value of described charger, adjust the preset charged current value of described charging equipment according to described current nominal output current value, and charge with the charging current value after adjustment.
6. charging method as claimed in claim 1, it is characterized in that, before the signal receiving the expression demand voltage value that charging equipment sends, also comprise: receive the detection signal that described charging equipment sends, corresponding feedback signal is sent to described charging equipment, making described charging equipment when receiving described feedback signal, sending the signal representing demand voltage value.
7. charging method as claimed in claim 1, it is characterized in that, in the demand voltage value according to described charging equipment, after the output voltage of adjustment charger, also comprise: when the signal of expression demand voltage value that described charging equipment sends not detected, the output voltage of charger is reset to acquiescence output voltage values.
8. charging method as claimed in claim 1, it is characterized in that, described charging equipment comprises following at least one: mobile terminal, charger baby.
9. a charging device, is characterized in that, comprising:
Acquiring unit, for when receiving the signal of the expression demand voltage value that charging equipment sends, obtains described charging equipment current demand magnitude of voltage;
Adjustment unit, for the demand voltage value according to described charging equipment, the output voltage of adjustment charger;
Transmitting element, for sending the signal representing current nominal output current value to described charging equipment, make described charging equipment adjust the preset charged current value of described charging equipment according to described current nominal output current value, and charge with the charging current value after adjustment.
10. charging device as claimed in claim 9, is characterized in that, the PWM ripple that described acquiring unit sends for receiving described charging equipment, and the duty ratio of a described PWM ripple is corresponding with described demand voltage value; Obtain the duty ratio of a described PWM ripple, according to the magnitude of voltage preset and the corresponding relation of PWM ripple duty ratio, obtain described charging device current demand magnitude of voltage.
11. charging devices as claimed in claim 9, it is characterized in that, described adjustment unit is used for when the demand voltage value of described charging equipment is greater than the maximum output voltage of described charger, the output voltage of described charger is adjusted to the maximum output voltage of described charger.
12. charging devices as claimed in claim 9, it is characterized in that, described transmitting element also for: obtain the output-current rating value corresponding with the charger output voltage after described adjustment, and the signal of the output current value representing described correspondence is sent to described charging equipment, described charging equipment is made to obtain described current nominal output current value, adjust the preset charged current value of described charging equipment, and charge with the charging current value after adjustment.
13. charging devices as claimed in claim 9, it is characterized in that, described transmitting element is used for sending the 2nd PWM ripple to described charging equipment, the duty ratio of described 2nd PWM ripple is corresponding with the current nominal output current value of described charger, make described charging equipment according to the current value preset and the corresponding relation of PWM ripple duty ratio, obtain the current nominal output current value of described charger, adjust the preset charged current value of described charging equipment according to described current nominal output current value, and charge with the charging current value after adjustment.
14. charging devices as claimed in claim 9, is characterized in that, also comprise: reset cell, for when the signal of expression demand voltage value that described charging equipment sends not detected, the output voltage of charger are reset to acquiescence output voltage values.
15. 1 kinds of chargers, is characterized in that, comprise PWM feedback circuit, electric pressure converter and PWM output circuit, wherein:
Described PWM feedback circuit, is suitable for the PWM ripple receiving charging equipment transmission, obtains the demand voltage value of described charging equipment corresponding to a described PWM ripple;
Described electric pressure converter, is suitable for the current demand magnitude of voltage according to described charging equipment, adjusts the output voltage of described charger;
Described PWM output circuit, be suitable for the corresponding relation according to the current value preset and PWM ripple duty ratio, the current nominal output current value of described charger is converted to the 2nd PWM ripple of duty ratio corresponding, and be sent to described charging equipment, described charging equipment is made to obtain described current nominal output current value, adjust the preset charged current value of described charging equipment, and charge with the charging current value after adjustment.
16. chargers as claimed in claim 15, is characterized in that, also comprise: control circuit and switching circuit, wherein:
Described control circuit, is suitable for, when the detection signal receiving the transmission of described charging equipment reaches preset duration, sending open command to described switching circuit;
Described switching circuit, is arranged between the DP port of described charger and DM port, is suitable for, when receiving the open command that described control circuit sends, disconnecting the connection between described DP port and described DM port.
17. chargers as claimed in claim 15, it is characterized in that, described electric pressure converter is AC-DC converter or dc-dc.
18. chargers as claimed in claim 17, it is characterized in that, when described electric pressure converter is AC-DC converter, isolator is set between described AC-DC converter and described PWM feedback circuit, is suitable for described AC-DC converter and described PWM feedback circuit physical isolation.
19. chargers as claimed in claim 18, it is characterized in that, described isolator is Light Coupled Device.
20. chargers as claimed in claim 15, it is characterized in that, described PWM feedback circuit comprises: sample circuit, is suitable for sampling to a described PWM ripple, to obtain the duty ratio of a described PWM ripple.
21. chargers as claimed in claim 20, it is characterized in that, described sample circuit comprises adc circuit.
22. chargers as claimed in claim 15, it is characterized in that, described PWM feedback circuit comprises: low pass filter; With ADC or the operation amplifier circuit of described low pass filter coupled.
23. chargers as claimed in claim 22, is characterized in that, described low pass filter comprise following any one: low-pass first order filter, second-order low-pass filter.
24. chargers as claimed in claim 15, it is characterized in that, described PWM output circuit comprises: comparator; The saw-toothed wave generator coupled with described comparator input terminal.
25. 1 kinds of charging methods, is characterized in that, comprising:
When receiving the signal representing demand voltage value, obtain described current demand magnitude of voltage;
According to described demand voltage value, the output voltage of adjustment charger;
Send the signal representing current nominal output current value.
26. charging methods as claimed in claim 25, is characterized in that, described when receiving the signal representing demand voltage value, obtain described current demand magnitude of voltage, comprising:
Receive a PWM ripple, the duty ratio of a described PWM ripple is corresponding with described demand voltage value;
Obtain the duty ratio of a described PWM ripple, according to the magnitude of voltage preset and the corresponding relation of PWM ripple duty ratio, obtain described demand voltage value.
27. charging methods as claimed in claim 25, it is characterized in that, described according to described demand voltage value, the output voltage of adjustment charger, comprise: when described demand voltage value is greater than the maximum output voltage of described charger, the output voltage of described charger is adjusted to the maximum output voltage of described charger.
28. charging methods as claimed in claim 25, is characterized in that, the described signal sending expression current nominal output current value, comprising: send the 2nd PWM ripple, the duty ratio of described 2nd PWM ripple is corresponding with the current nominal output current value of described charger.
29. 1 kinds of charging devices, is characterized in that, comprising:
Acquiring unit, for when receiving the signal representing demand voltage value, obtains described demand voltage value;
Adjustment unit, for according to described demand voltage value, adjusts the output voltage of charger;
Transmitting element, for sending the signal representing current nominal output current value.
30. charging devices as claimed in claim 29, is characterized in that, described acquiring unit is used for receiving a PWM ripple, obtain the duty ratio of a described PWM ripple, according to the magnitude of voltage preset and the corresponding relation of PWM ripple duty ratio, obtain described demand voltage value.
31. charging devices as claimed in claim 29, is characterized in that, described adjustment unit is used for when described demand voltage value is greater than the maximum output voltage of described charger, the output voltage of described charger is adjusted to the maximum output voltage of described charger.
32. charging devices as claimed in claim 29, is characterized in that, described transmitting element is for sending the 2nd PWM ripple, and the duty ratio of described 2nd PWM ripple is corresponding with the current nominal output current value of described charger.
33. 1 kinds of chargers, is characterized in that, comprise PWM feedback circuit, electric pressure converter and PWM output circuit, wherein:
Described PWM feedback circuit, is suitable for reception the one PWM ripple, obtains the demand voltage value that a described PWM ripple is corresponding;
Described electric pressure converter, is suitable for, according to described demand voltage value, adjusting the output voltage of described charger; Described PWM output circuit, is suitable for the corresponding relation according to the current value preset and PWM ripple duty ratio, the current nominal output current value of described charger is converted to the 2nd PWM ripple of duty ratio corresponding and send.
34. chargers as claimed in claim 33, it is characterized in that, described electric pressure converter is AC-DC converter or dc-dc.
35. chargers as claimed in claim 34, it is characterized in that, when described electric pressure converter is AC-DC converter, isolator is set between described AC-DC converter and described PWM feedback circuit, is suitable for described AC-DC converter and described PWM feedback circuit physical isolation.
36. chargers as claimed in claim 35, it is characterized in that, described isolator is Light Coupled Device.
37. chargers as claimed in claim 33, it is characterized in that, described PWM feedback circuit comprises: sample circuit, is suitable for sampling to a described PWM ripple, to obtain the duty ratio of a described PWM ripple.
38. chargers as claimed in claim 37, it is characterized in that, described sample circuit comprises adc circuit.
39. chargers as claimed in claim 33, it is characterized in that, described PWM feedback circuit comprises: low pass filter; With ADC or the operation amplifier circuit of described low pass filter coupled.
40. chargers as claimed in claim 39, is characterized in that, described low pass filter comprise following any one: low-pass first order filter, second-order low-pass filter.
41. chargers as claimed in claim 33, it is characterized in that, described PWM output circuit comprises: comparator; The saw-toothed wave generator coupled with described comparator input terminal.
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