CN107742983A - Share constant current constant voltage control module, reduction voltage circuit and the compensation method of compensation - Google Patents
Share constant current constant voltage control module, reduction voltage circuit and the compensation method of compensation Download PDFInfo
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- CN107742983A CN107742983A CN201711224604.4A CN201711224604A CN107742983A CN 107742983 A CN107742983 A CN 107742983A CN 201711224604 A CN201711224604 A CN 201711224604A CN 107742983 A CN107742983 A CN 107742983A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of DC power input into DC power output
- H02M3/02—Conversion of DC power input into DC power output without intermediate conversion into AC
- H02M3/04—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters
- H02M3/10—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
-
- 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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The present invention provides a kind of constant current constant voltage control module, reduction voltage circuit and the compensation method of shared compensation, including：Voltage input module；Export the inductance of regulated power；Load；Produce the output current sampling module of output current sampled signal；Produce the output voltage feedback module of output voltage feedback signal；Compensation electric current is produced according to output current sampled signal and output voltage feedback signal, and carries out the constant current constant voltage control module of constant current constant voltage control；Produce the loop compensation module of offset voltage.Output voltage feedback signal and output current sampled signal are obtained, by both the greater under same operating voltage compared with reference voltage, and obtains sharing offset voltage, the pulsewidth of switch controlling signal is adjusted with this, control output is constant.The present invention shares by handling current loop signal and voltage loop signal and compensates network all the way, realize that the decompression with constant current constant voltage output characteristics is changed so that the component number of offset peripheral network halves, cost-effective.
Description
Technical field
The present invention relates to the driving of switching mode buck and switch technology, more particularly to a kind of perseverance of shared compensation
Flow Isobarically Control module, reduction voltage circuit and compensation method.
Background technology
For many years, the control IC (integrated circuit) of various voltage dropping power supplies has been developed and applied, with realize constant current or
The control of person's constant pressure output, its application include the stand-by power supply of LED driver, charger and mobile device.
The information of voltage that prior art obtains output end by carrying out partial pressure sampling to output end, electricity of having been connected to output end
Flow sampling resistor and the information of output end current is obtained according to the pressure difference at current sampling resistor both ends, it is each by amplifying two paths of signals
From the error with calibration point and the dutycycle of controlling switch, the control of constant current constant voltage output is realized using the afterflow characteristic of inductance
System.In the loop control that two paths of signals is formed, in order that loop stability, two loops have each carried out loop compensation so that
Component for compensating network is more, and circuit overall volume is big, is unfavorable for integrated.
In summary, current loop signal and voltage loop signal are respectively adopted and compensate network all the way so that compensation network
Component is more, the problems such as circuit structure is cumbersome, volume is big, it has also become one of those skilled in the art's urgent problem to be solved.
The content of the invention
In view of the above the shortcomings that prior art, it is an object of the invention to provide a kind of constant current constant voltage of shared compensation
Control module, reduction voltage circuit and compensation method, the component for solving to compensate network in the prior art is more, and circuit structure is numerous
It is trivial, the problems such as volume is big.
In order to achieve the above objects and other related objects, the present invention provides a kind of constant current constant voltage control mould of shared compensation
Block, the constant current constant voltage control module comprise at least：
Voltage conversion unit, signal behavior unit, voltage turn current amplification unit, pwm unit, first switch and
Second switch；
The voltage conversion unit receives the output current sampled signal of reduction voltage circuit, by the output current sampled signal
Zoom in or out as output current conversion signal, the operating voltage of the output current conversion signal is defeated with the reduction voltage circuit
The operating voltage for going out voltage feedback signal is consistent；
The signal behavior unit connects the output end of the voltage conversion unit and receives the output voltage feedback letter
Number, it is used as output signal to select larger in the output current conversion signal and the output voltage feedback signal one；
The input that the voltage turns current amplification unit connects the signal behavior unit and a reference signal respectively, will
The output signal of the signal behavior unit is compared with the reference signal, and after comparative result is converted into current signal
Output compensation electric current, the compensation electric current connect external loop compensation module and are converted into offset voltage；
The pwm unit is connected to the output end that the voltage turns current amplification unit, according to the offset voltage
Adjust the dutycycle of the first switch or the control signal of the second switch；
The first switch is connected between the input voltage of the reduction voltage circuit and the inductance of the reduction voltage circuit, is used for
Control storage and the release electric energy of the inductance, so control the reduction voltage circuit output current and output voltage it is constant；
One end of the second switch connects the connecting node of the first switch and the inductance, the other end is grounded, and uses
In control loss is reduced by ground to the afterflow passage of the inductance to reduce pressure drop.
Preferably, a filter unit, institute are also connected between the voltage conversion unit and the output current sampled signal
It is RC filter units to state filter unit.
Preferably, the voltage conversion unit includes operational amplifier, NMOS tube, current source, first resistor and the second electricity
Resistance；Normal phase input end connection prime output signal, the output end of the operational amplifier connect the grid end of the NMOS tube, described
Current source is grounded after being sequentially connected in series with the first resistor and the second resistance, and the drain terminal of the NMOS tube connects the electric current
The output end in source simultaneously exports the output current conversion signal, source ground connection；The company of the first resistor and the second resistance
Connect the inverting input that node connects the operational amplifier.
Preferably, the signal behavior unit includes comparator, the first transmission gate, the second transmission gate, the comparator
Normal phase input end connects the output current conversion signal, inverting input connects the output voltage feedback signal；Described
The input of one transmission gate connects the output current conversion signal, output end connects the output end and work of second transmission gate
The output signal of the comparator, inverted control signal are connected for the output end of the signal behavior unit, positive control signal
Connect the inverted signal of the comparator output signal；The input of second transmission gate connects the output voltage feedback letter
Number, output end connects the output end of first transmission gate, positive control signal connects the anti-letter of the comparator output signal
Number, inverted control signal connect the output signal of the comparator.
In order to achieve the above objects and other related objects, the present invention also provides a kind of reduction voltage circuit of shared compensation, described
The reduction voltage circuit for sharing compensation comprises at least：
Voltage input module, above-mentioned constant current constant voltage control module, loop compensation module, inductance, output voltage feedback module,
Load and output current sampling module；
The voltage input module provides input voltage；
One end of the inductance is connected to the constant current constant voltage control module, the other end as voltage output end, for defeated
Go out stable output voltage and output current；
One end connection output voltage, the other end of the load are grounded after the output current sampling module, described
Output current sampling module produces output current sampled signal；
The output voltage feedback module is connected between the output voltage and ground, for producing output voltage feedback letter
Number；
The constant current constant voltage control module is connected to the voltage input module, the output voltage feedback module and described
The output end of output current sampling module, benefit is produced according to the output current sampled signal and the output voltage feedback signal
Electric current is repaid, and constant control is carried out to the output voltage and the output current by the control of the loop compensation module；
The loop compensation module is connected to the constant current constant voltage control module, for producing phase according to the compensation electric current
The offset voltage answered.
Preferably, the output voltage feedback module includes the first sampling resistor and the second sampling resistor of series connection, described
First sampling resistor and second sampling resistor carry out partial pressure to the output voltage and then obtain the output voltage feedback
Signal.
Preferably, the loop compensation module includes compensation resistance and the first compensating electric capacity, one end of the compensation resistance
Connect the constant current constant voltage control module, the other end is connected with first compensating electric capacity, first compensating electric capacity it is another
End ground connection.
Preferably, the loop compensation module also includes the second compensating electric capacity, one end connection of second compensating electric capacity
The constant current constant voltage control module, other end ground connection.
Preferably, the reduction voltage circuit of the shared compensation also includes an output capacitance, one end connection of the output capacitance
The voltage output end, other end ground connection.
In order to achieve the above objects and other related objects, the present invention provides a kind of shared compensation method of reduction voltage circuit, institute
The shared compensation method for stating reduction voltage circuit comprises at least：
Output current and output voltage are sampled, output voltage feedback signal and output current sampled signal are obtained, by institute
State output voltage feedback signal and the greater and a reference voltage of the output current sampled signal under same operating voltage
It is compared, is obtained sharing offset voltage accordingly according to comparative result, switch controlling signal is carried out with the offset voltage
Pulsewidth modulation, and then control output constant pressure and constant current.
Preferably, voltage conversion is carried out to the output current sampled signal and obtains output current conversion signal, so that institute
State output voltage feedback signal with the output current conversion signal to be located under same operating voltage, meet equation below：SENBF
=KSEN；Wherein, SENBF is output current conversion signal；K is fixed constant, andVFBIt is anti-when being exported for constant pressure
Feedthrough voltage calibration point, VCSFor constant current output when sampled voltage calibration point.
Preferably, output current constant current is adjusted by the control of the offset voltage, meets following relational expression：Wherein, IOUTFor output current, VCSFor constant current output when sampled voltage calibration point, R16For the output current
Sampling resistor.
Preferably, output voltage constant current is adjusted by the control of the offset voltage, meets following relational expression：Wherein, VOUTFor output voltage, VFBFeedback voltage calibration point when being exported for constant pressure,For institute
State the divider resistance ratio of output voltage.
Preferably, constant current or Isobarically Control further comprise：
When the output voltage feedback signal and the greater of the output current sampled signal under same operating voltage
During more than the reference voltage, the offset voltage reduces；When the output voltage feedback signal and the output current sample
When the greater of signal under same operating voltage is less than the reference voltage, the offset voltage increase.
As described above, the present invention shared compensation constant current constant voltage control module, reduction voltage circuit and compensation method, have with
Lower beneficial effect：
Constant current constant voltage control module, reduction voltage circuit and the compensation method of the shared compensation of the present invention are by believing current loop
Number and voltage loop signal handled, then share and compensate network all the way, realize the decompression with constant current constant voltage output characteristics
Conversion so that the component number as offset peripheral network halves, can be more if compensation network is built in chip
Reduction chip area, so as to save application cost.
Brief description of the drawings
Fig. 1 is shown as the structural representation of the reduction voltage circuit of the shared compensation of the present invention.
Fig. 2 is shown as the structural representation of the filter unit of the present invention.
Fig. 3 is shown as the structural representation of the voltage conversion unit of the present invention.
Fig. 4 is shown as the structural representation of the signal behavior unit of the present invention.
Component label instructions
1 shares the reduction voltage circuit of compensation
11 voltage input modules
12 constant current constant voltage control modules
121 filter units
1211 filter resistances
1212 filter capacitors
122 voltage conversion units
1221 operational amplifiers
1222 NMOS tubes
1223 current sources
1224 first resistors
1225 second resistances
123 signal behavior units
1231 comparators
1232 first transmission gates
1233 second transmission gates
1234 phase inverters
124 voltages turn current amplification unit
125 pwm units
126 first switches
127 second switches
13 inductance
14 output voltage feedback modules
141 first sampling resistors
142 second sampling resistors
15 loads
16 output current sampling modules
17 output capacitances
18 loop compensation modules
181 compensation resistance
182 first compensating electric capacities
183 second compensating electric capacities
Embodiment
Illustrate embodiments of the present invention below by way of specific instantiation, those skilled in the art can be by this specification
Disclosed content understands other advantages and effect of the present invention easily.The present invention can also pass through specific realities different in addition
The mode of applying is embodied or practiced, the various details in this specification can also be based on different viewpoints with application, without departing from
Various modifications or alterations are carried out under the spirit of the present invention.
Refer to Fig. 1~Fig. 4.It should be noted that the diagram provided in the present embodiment only illustrates this in a schematic way
The basic conception of invention, the component relevant with the present invention is only shown in schema then rather than according to package count during actual implement
Mesh, shape and size are drawn, and kenel, quantity and the ratio of each component can be a kind of random change during its actual implementation, and its
Assembly layout kenel may also be increasingly complex.
As shown in figure 1, the present invention provides a kind of reduction voltage circuit 1 of shared compensation, the reduction voltage circuit 1 of the shared compensation wraps
Include：
Voltage input module 11, constant current constant voltage control module 12, inductance 13, output voltage feedback module 14, load 15, it is defeated
Go out current sample module 16, output capacitance 17 and loop compensation module 18.
As shown in figure 1, the voltage input module 11 connects the input of the constant current constant voltage control module 12, for carrying
For input voltage VIN.
Specifically, in the present embodiment, the voltage input module 11 is voltage source.The voltage input module 11 also may be used
AC power is converted to by the input voltage VIN using rectification circuit, is not limited with the present embodiment.
As shown in figure 1, one end of the inductance 13 is connected to the constant current constant voltage control module 12, other end output stabilization
Output voltage VO UT and output current IO UT.
As shown in figure 1, the output voltage feedback module 14 is connected between the output voltage VO UT and ground, for producing
Raw output voltage feedback signal VFB.
Specifically, the output voltage feedback module 14 includes the first sampling resistor 141 and the second sampling resistor 142, institute
State the first sampling resistor 141 and second sampling resistor 142 and partial pressure is carried out to the output voltage VO UT, and then obtain described
Output voltage feedback signal VFB.
As shown in figure 1, one end of the load 15 connects the output voltage VO UT, the other end passes through the output current
It is grounded after sampling module 16.
Specifically, the output current sampling module 16 is connected with the load 15, will flow through the electric current of the load 15
It is voltage signal to be converted to output current sampled signal VCS, the output current sampled signal VCS.In the present embodiment, it is described
Output current sampling module 16 is the 3rd sampling resistor.
As shown in figure 1, one end of the output capacitance 17 connects the output voltage VO UT, other end ground connection.
As shown in figure 1, the constant current constant voltage control module 12 is connected to the voltage input module 11, the output voltage
The output end of feedback module 14 and the output current sampling module 16, according to the output voltage feedback signal VFB and described
Output current sampled signal VCS produce compensation electric current, and by the loop compensation module 18 control to the output voltage
VOUT or described output current IOs UT carries out constant control.
Specifically, the constant current constant voltage control module 12 includes filter unit 121, voltage conversion unit 122, signal behavior
Unit 123, voltage turn current amplification unit 124, pwm unit 125, first switch 126 and second switch 127.
More specifically, as shown in Fig. 2 the filter unit 121 receives the output current sampled signal VCS, to described
Output current sampled signal VCS is filtered.The filter unit 121 includes but is not limited to RC filter units.In the present embodiment
In, the filter unit 121 includes filter resistance 1211 and filter capacitor 1212；One end connection institute of the filter resistance 1211
State output current sampled signal VCS, output end of the other end as the filter unit 121；The one of the filter capacitor 1212
End connects the output end of the filter unit 121, other end ground connection.
More specifically, as shown in figure 3, the voltage conversion unit 122 receives the output voltage of the filter unit 121
SEN, the output voltage SEN of the filter unit 121 is zoomed in or out (equivalent to the output current sampled signal VCS) for
Output current conversion signal SENBF, the output current conversion signal SENBF operating voltage and the output voltage feedback letter
Number VFB operating voltage is consistent.In the present embodiment, the voltage conversion unit 122 include operational amplifier 1221,
NMOS tube 1222, current source 1223, first resistor 1224 and second resistance 1225.The positive input of the operational amplifier 1221
End connects the output voltage SEN of the filter unit 121, output end connects the grid end of the NMOS tube 1222；The current source
1223 be sequentially connected in series with the first resistor 1224 and the second resistance 1225 after be grounded；The drain terminal of the NMOS tube 1222 connects
Connect the output end of the current source 1223 and export the output current conversion signal SENBF, source ground connection；The first resistor
1224 and the connecting node of the second resistance 1225 connect the inverting input of the operational amplifier 1221.The output electricity
Stream conversion signal SENBF meets following relation：SENBF=KSEN；Wherein, K is fixed constant, andVFBFor constant pressure
Feedback voltage calibration point during output, VCSFor constant current output when sampled voltage calibration point；SEN is output current sampled signal.At this
It is strong according to empty short empty disconnected principle, the connecting node of the first resistor 1224 and the second resistance 1225 in embodiment
System is equal to the output voltage SEN of the filter unit 121, thenBy setting described first
Resistance 1224 and the second resistance 1225, makeThe output current conversion signal that can be needed
SENBF。
More specifically, as shown in figure 4, the signal behavior unit 123 connects the output end of the voltage conversion unit 122
And the output voltage feedback signal VFB is received, it is anti-to select the output current conversion signal SENBF and the output voltage
Larger one is used as output signal DS in feedback signal VFB.The signal behavior unit 123 can pass through the alternative of arbitrary structures
Circuit realiration, it is not limited to the concrete structure enumerated in the present embodiment.In the present embodiment, the signal behavior unit 123 includes
Comparator 1231, the first transmission gate 1232, the second transmission gate 1233 and phase inverter 1234.The positive input of the comparator 1231
End connects the output current conversion signal SENBF, inverting input connects the output voltage feedback signal VFB, output end
Connect the phase inverter 1234.The input of first transmission gate 1232 connects the output current conversion signal SENBF, defeated
Go out end and connect the output end of second transmission gate 1233 and output end, positive phase control as the signal behavior unit 123
Signal connects the output signal of the comparator 1231, inverted control signal connects the output end of the phase inverter 1234；It is described
The input of second transmission gate 1233 connects the output voltage feedback signal VFB, output end connects first transmission gate
1232 output end, positive control signal connects the output end of the phase inverter 1234, inverted control signal connects the comparison
The output signal of device 1231.
More specifically, the input that the voltage turns current amplification unit 124 connects the signal behavior unit 123 respectively
And a reference signal VREF, by the output signal DS of the signal behavior unit 123 compared with the reference signal VREF,
And comparative result is converted into after current signal and exports compensation electric current, the compensation electric current connects external loop compensation module and turned
Turn to offset voltage VCOMP.In the present embodiment, the voltage turns described in the inverting input connection of current amplification unit 124
The output end of signal behavior unit 123, normal phase input end connect the reference voltage VREF.In actual applications, the voltage
Turning the input polarity of current amplification unit 124 can be exchanged by increasing phase inverter, be not limited with the present embodiment.
More specifically, the pwm unit 125 is connected to the output end that the voltage turns current amplification unit 124,
The dutycycle of the first switch 126 or the control signal of the second switch 127 is adjusted according to the offset voltage VCOMP.
More specifically, the first switch 126 is connected between the input voltage VIN and the inductance 13, for controlling
Storage and the release electric energy of the inductance 13 are made, and then controls the output current IO UT and output voltage of the reduction voltage circuit 1
VOUT's is constant.When the first switch 126 turns on, the input voltage VIN is that the inductance 13 charges；When described first
During the shut-off of switch 126, the inductance 13 discharges.The first switch 126 can use MOS switch to realize, include but is not limited to
NMOS and PMOS.
More specifically, one end of the second switch 127 connects the first switch 126 and the connection section of the inductance 13
Point, other end ground connection, loss is reduced by ground to the afterflow passage of the inductance 13 to reduce pressure drop for controlling.Described second opens
Closing 127 can use MOS switch to realize, including but not limited to NMOS and PMOS, in the present embodiment, the second switch 127 is
NMOS tube.
As shown in figure 1, the loop compensation module 18 is connected to the constant current constant voltage control module 12, for according to
Compensate electric current and produce corresponding offset voltage VCOM.
Specifically, the loop compensation module 18 includes compensation resistance 181, the first compensating electric capacity 182 and the second compensation electricity
Hold 183, one end of the compensation resistance 181 connects the constant current constant voltage control module 12, the other end and the described first compensation electricity
Hold 182 connections, the other end ground connection of first compensating electric capacity 182；One end of second compensating electric capacity 183 connects the perseverance
Flow Isobarically Control module 12, other end ground connection.In some practical applications, second compensating electric capacity 183 can be omitted.
The present invention also provides a kind of shared compensation method of reduction voltage circuit, the shared compensation method bag of the reduction voltage circuit
Include：
Output current and output voltage are sampled, output voltage feedback signal and output current sampled signal are obtained, by institute
State output voltage feedback signal and the greater and a reference voltage of the output current sampled signal under same operating voltage
It is compared, is obtained sharing offset voltage accordingly according to comparative result, switch controlling signal is carried out with the offset voltage
Pulsewidth modulation, and then control output constant pressure and constant current.
In the present embodiment, the reduction voltage circuit 1 based on the shared compensation, which is realized, shares compensation method.
Specifically, described in being obtained respectively based on the output voltage feedback module 14 and the output current sampling module 16
Output voltage feedback signal VFB and output current sampled signal VCS.
Specifically, the output current sampled signal VCS is filtered based on the filter unit 121, obtained described
The filtered signal SEN of output current sampled signal VCS.
Specifically, based on the voltage conversion unit 122 by the filtered signals of the output current sampled signal VCS
SEN (or described output current sampled signal VCS) is zoomed in or out as output current conversion signal SENBF, the output current
Conversion signal SENBF operating voltage and the operating voltage of the output voltage feedback signal VFB are consistent, in order to follow-up
The comparison of circuit.In the present embodiment, according to empty short empty disconnected principle, the first resistor 1224 and the second resistance 1225
Connecting node be forced output voltage SEN equal to the filter unit 121, thenIt is logical
Cross and set the first resistor 1224 and the second resistance 1225, makeThe output electricity that can be needed
Conversion signal SENBF is flowed, and then the two-way input signal of the signal behavior unit 123 is located at same rank.The institute needed
State output current conversion signal SENBF and meet following relation：SENBF=KSEN；Wherein, K is fixed constant, and
VFBFeedback voltage calibration point, V when being exported for constant pressureCSFor constant current output when sampled voltage calibration point.
Specifically, it is based on the signal behavior unit 123 that the output current conversion signal SENBF and the output is electric
Selected for larger one in pressure feedback signal VFB, and as output signal DS.
Specifically, current amplification unit 124 is turned by the output signal DS of the signal behavior unit 123 based on the voltage
Compared with reference signal VREF, and comparative result is converted into after current signal and exports compensation electric current.
Specifically, the compensation electric current is received based on the loop compensation module 18 and is converted into offset voltage VCOMP.When
The output voltage feedback signal VFB and output current conversion signal SENBF the greater is more than the reference voltage
During VREF, the offset voltage VCOMP reduces；As the output voltage feedback signal VFB and the output current conversion signal
When SENBF the greater is less than the reference voltage VREF, the offset voltage VCOMP increases.
Specifically, the pwm unit 125 is adjusted the first switch by the control of the offset voltage VCOMP
126 and the ON time of the second switch 127, to realize the output voltage VO UT's of the reduction voltage circuit 1 of the shared compensation
Output current IO UT's constant and by the load 15 is constant.In the present embodiment, the output voltage VO UT meets such as
Lower relational expression：Wherein, VOUTFor output voltage, VFBFeedback voltage calibration point when being exported for constant pressure,For the divider resistance ratio of the output voltage；Output current IO UT meets following relational expression：Wherein,
IOUTFor output current, VCSFor constant current output when sampled voltage calibration point, R16For the sampling resistor of the output current.
More specifically, the first switch control signal HS of the pwm unit 125 controls the first switch 126,
Within each cycle, according to the difference of the offset voltage VCOMP values, the first switch control signal HS can adjust described
The ON time of one switch 126, there is positive relationship in both.The second switch control signal LS controls of the pwm unit 125
Make the second switch 127, the second switch control signal LS and the first switch 126 and the work shape of the inductance 13
State is relevant.The first switch 126 and the second switch 127 can form two kinds of current loops：The first loop, described first
The switch controlling signal HS controls first switch 126 turns on and the second switch control signal LS controls the second switch
During 127 disconnection, the voltage input module 11 is pressurized to the inductance 13 through the first switch 126, and LX ends are high level,
First switch 126 described in VOU and the inductance 13, the load 15 and the output current sampling module 16 are then passed through,
It is returned to the ground terminal of the voltage input module 11；Second of loop, the first switch control signal HS controls described first
After the shut-off of switch 126, because the afterflow characteristic of the inductance 13 so that the voltage reversal at the both ends of inductance 13, VOUT ends are
High level, LX ends are low level, and electric current is gradually reduced, and electric current passes through described in the second switch 127 to LX ends and inflow from ground
Inductance 13, then ground is returned to through the load 15 and the output current sampling module 16, when electric current is reduced to zero namely LX ends
Voltage it is identical with ground when, the second switch control signal LS controls the second switch 127 is disconnected to close.I.e. described first opens
Close the spy that the control signal HS and second switch control signal LS controls the first switch 126 and the second switch 127
Levy and be：When the first switch 126 turns on, the second switch 127 turns off；The second switch 127 is only opened described first
The shut-off of pass 126 and LX voltages just turn on when being less than ground.
Constant current constant voltage control module, reduction voltage circuit and the compensation method of the shared compensation of the present invention are by believing current loop
Number and voltage loop signal handled, share and compensate network all the way, realize that the decompression with constant current constant voltage output characteristics is changed,
So that halved with the component number of offset peripheral network, the more reduction chip face of energy when compensating network and being built in chip
Product.
In summary, the present invention provides a kind of constant current constant voltage control module, reduction voltage circuit and the compensation method of shared compensation,
Including：The voltage input module of input voltage is provided；Export the inductance of regulated power；Load；Produce output current sampled signal
Output current sampling module；Produce the output voltage feedback module of output voltage feedback signal；Sampled and believed according to output current
Number and output voltage feedback signal produce compensation electric current, and by loop compensation module control progress constant current constant voltage control constant current
Isobarically Control module；The loop compensation module of corresponding offset voltage is produced according to compensation electric current.To output current and output electricity
Pressure sampling, obtains output voltage feedback signal and output current sampled signal, by the output voltage feedback signal with it is described defeated
Go out the greater of current sampling signal under same operating voltage compared with a reference voltage, phase is obtained according to comparative result
The shared offset voltage answered, with the offset voltage to switch controlling signal carry out pulsewidth modulation, and then control output constant pressure or
Constant current.Constant current constant voltage control module, reduction voltage circuit and the compensation method of the shared compensation of the present invention pass through to current loop signal
And voltage loop signal is handled, share and compensate network all the way, realize that the decompression with constant current constant voltage output characteristics is changed, make
It must halve as the component number of offset peripheral network, the more reduction chip face of energy when compensating network and being built in chip
Product.So the present invention effectively overcomes various shortcoming of the prior art and has high industrial utilization.
The above-described embodiments merely illustrate the principles and effects of the present invention, not for the limitation present invention.It is any ripe
Know the personage of this technology all can carry out modifications and changes under the spirit and scope without prejudice to the present invention to above-described embodiment.Cause
This, those of ordinary skill in the art is complete without departing from disclosed spirit and institute under technological thought such as
Into all equivalent modifications or change, should by the present invention claim be covered.
Claims (14)
- A kind of 1. constant current constant voltage control module of shared compensation, it is characterised in that：The constant current constant voltage control module comprises at least：Voltage conversion unit, signal behavior unit, voltage turn current amplification unit, pwm unit, first switch and second Switch；The voltage conversion unit receives the output current sampled signal of reduction voltage circuit, and the output current sampled signal is amplified Or output current conversion signal is reduced into, the operating voltage of the output current conversion signal and the output electricity of the reduction voltage circuit The operating voltage of pressure feedback signal is consistent；The signal behavior unit connects the output end of the voltage conversion unit and receives the output voltage feedback signal, with Select larger in the output current conversion signal and the output voltage feedback signal one and be used as output signal；The input that the voltage turns current amplification unit connects the signal behavior unit and a reference signal respectively, by described in The output signal of signal behavior unit exports compared with the reference signal after comparative result is converted into current signal Electric current is compensated, the compensation electric current connects external loop compensation module and is converted into offset voltage；The pwm unit is connected to the output end that the voltage turns current amplification unit, is adjusted according to the offset voltage The dutycycle of the first switch or the control signal of the second switch；The first switch is connected between the input voltage of the reduction voltage circuit and the inductance of the reduction voltage circuit, for controlling Inductance storage and release electric energy, so control the reduction voltage circuit output current and output voltage it is constant；One end of the second switch connects the connecting node of the first switch and the inductance, the other end is grounded, for controlling System reduces loss by ground to the afterflow passage of the inductance to reduce pressure drop.
- 2. constant current constant voltage control module according to claim 1, it is characterised in that：The voltage conversion unit with it is described defeated Go out between current sampling signal and be also connected with a filter unit, the filter unit is RC filter units.
- 3. constant current constant voltage control module according to claim 1 or 2, it is characterised in that：The voltage conversion unit includes Operational amplifier, NMOS tube, current source, first resistor and second resistance；Before the normal phase input end connection of the operational amplifier Level output signal, output end connect the grid end of the NMOS tube, the current source and the first resistor and the second resistance It is grounded after being sequentially connected in series, the drain terminal of the NMOS tube connects the output end of the current source and exports the output current conversion letter Number, source ground connection；The connecting node of the first resistor and the second resistance connects the anti-phase input of the operational amplifier End.
- 4. constant current constant voltage control module according to claim 1, it is characterised in that：The signal behavior unit includes comparing Device, the first transmission gate, the second transmission gate, the normal phase input end of the comparator connect the output current conversion signal, anti-phase Input connects the output voltage feedback signal；The input of first transmission gate connects the output current conversion letter Number, output end connects the output end of second transmission gate and output end, positive phase control as the signal behavior unit are believed The output signal of number connection comparator, inverted control signal connect the inverted signal of the comparator output signal；Described The inputs of two transmission gates connects the output voltage feedback signal, output end connects the output end, just of first transmission gate Phase control signal connects the inverted signal of the comparator output signal, the output letter of the inverted control signal connection comparator Number.
- 5. a kind of reduction voltage circuit of shared compensation, it is characterised in that the reduction voltage circuit of the shared compensation comprises at least：Voltage input module, the constant current constant voltage control module as described in Claims 1 to 4 any one, loop compensation module, electricity Sense, output voltage feedback module, load and output current sampling module；The voltage input module provides input voltage；One end of the inductance is connected to the constant current constant voltage control module, the other end as voltage output end, steady for exporting Fixed output voltage and output current；One end connection output voltage, the other end of the load are grounded after the output current sampling module, the output Current sample module produces output current sampled signal；The output voltage feedback module is connected between the output voltage and ground, for producing output voltage feedback signal；The constant current constant voltage control module is connected to the voltage input module, the output voltage feedback module and the output The output end of current sample module, compensation electricity is produced according to the output current sampled signal and the output voltage feedback signal Stream, and constant control is carried out to the output voltage and the output current by the control of the loop compensation module；The loop compensation module is connected to the constant current constant voltage control module, corresponding for being produced according to the compensation electric current Offset voltage.
- 6. the reduction voltage circuit of shared compensation according to claim 5, it is characterised in that：The output voltage feedback module bag The first sampling resistor and the second sampling resistor of series connection are included, first sampling resistor and second sampling resistor are to described defeated Go out voltage to carry out partial pressure and then obtain the output voltage feedback signal.
- 7. the reduction voltage circuit of shared compensation according to claim 5, it is characterised in that：The loop compensation module includes mending Repay resistance and the first compensating electric capacity, one end of the compensation resistance connect the constant current constant voltage control module, the other end with it is described First compensating electric capacity connects, the other end ground connection of first compensating electric capacity.
- 8. the reduction voltage circuit of shared compensation according to claim 7, it is characterised in that：The loop compensation module also includes Second compensating electric capacity, one end of second compensating electric capacity connect the constant current constant voltage control module, other end ground connection.
- 9. the reduction voltage circuit of shared compensation according to claim 5, it is characterised in that：The reduction voltage circuit of the shared compensation Also include an output capacitance, one end of the output capacitance connects the voltage output end, other end ground connection.
- 10. the shared compensation method of a kind of reduction voltage circuit, it is characterised in that the shared compensation method of the reduction voltage circuit is at least wrapped Include：Output current and output voltage are sampled, obtain output voltage feedback signal and output current sampled signal, will be described defeated Go out the greater and a reference voltage of voltage feedback signal and the output current sampled signal under same operating voltage to carry out Compare, obtained sharing offset voltage accordingly according to comparative result, pulsewidth is carried out to switch controlling signal with the offset voltage Modulation, and then control output constant pressure and constant current.
- 11. the shared compensation method of reduction voltage circuit according to claim 10, it is characterised in that：The output current is adopted Sample signal carries out voltage conversion and obtains output current conversion signal, so that the output voltage feedback signal and the output current Conversion signal is located under same operating voltage, meets equation below：SENBF=KSEN；Wherein, SENBF turns for output current Change signal；K is fixed constant, andVFBFeedback voltage calibration point, V when being exported for constant pressureCSTo be sampled during constant current output Voltage calibration point；SEN is output current sampled signal.
- 12. the shared compensation method of reduction voltage circuit according to claim 10, it is characterised in that：Pass through the offset voltage Control adjustment output current constant current, meet following relational expression：Wherein, IOUTFor output current, VCSFor constant current Sampled voltage calibration point during output, R16For the sampling resistor of the output current.
- 13. the shared compensation method of reduction voltage circuit according to claim 10, it is characterised in that：Pass through the offset voltage Control adjustment output voltage constant current, meet following relational expression：Wherein, VOUTFor output electricity Pressure, VFBFeedback voltage calibration point when being exported for constant pressure,For the divider resistance ratio of the output voltage.
- 14. the shared compensation method of reduction voltage circuit according to claim 10, it is characterised in that：Constant current or Isobarically Control enter One step includes：When the greater of the output voltage feedback signal with the output current sampled signal under same operating voltage is more than During the reference voltage, the offset voltage reduces；When the output voltage feedback signal and the output current sampled signal When the greater under same operating voltage is less than the reference voltage, the offset voltage increase.
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