CN106712210B - Power supply device and charging control method thereof - Google Patents
Power supply device and charging control method thereof Download PDFInfo
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- CN106712210B CN106712210B CN201710083063.1A CN201710083063A CN106712210B CN 106712210 B CN106712210 B CN 106712210B CN 201710083063 A CN201710083063 A CN 201710083063A CN 106712210 B CN106712210 B CN 106712210B
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
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- H02J7/0077—
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
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- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a power supply device and a charging control method thereof, which consider the control and adjustment of an adapter under various power supply deficiency conditions, adjust the current limiting value of a current limiting switch according to the judgment of input voltage under the power supply deficiency conditions, and distinguish and control according to whether the current limiting value is enough to provide load current or not in a charge-while-discharge mode. The invention can provide protection measures in different working states and special working states of adapter load such as insufficient power supply, overlarge power pulling and the like.
Description
Technical Field
The present invention relates to the field of charging technologies, and more particularly, to a power supply apparatus and a charging control method thereof.
Background
In the prior art, an adapter is typically used to power or charge a power device. As shown in fig. 1, the power supply device in the prior art comprises a power stage circuit and a current limiting switch, wherein an input current of the power supply device is sampled by a current detection circuit, and a current control circuit adjusts the current limiting switch according to the input current and simultaneously controls a drive control circuit, wherein the drive control circuit is used as a control circuit of the power stage circuit. The adapter is adopted to charge power supply equipment in the prior art, under the condition that the power supply capacity of the adapter is insufficient, the output voltage VIN of the adapter can be reduced to be very low when the charging pull current is too large, the adapter can always work in an overcurrent state, and the adapter is easy to overheat. Some adapters may be pulled down below the undervoltage protection threshold, and the adapters are repeatedly turned on and off, so that the power supply equipment is repeatedly turned on and off, and cannot be charged and discharged normally.
The basic working principle is as follows: when the output capacity of the adapter can meet the current required by the power supply equipment, the adapter shows Constant Voltage (CV) characteristics and is in a normal working state, as shown in FIG. 2; when the power supply capability of the adapter is insufficient to maintain the current required by the power supply device, the adapter exhibits a Constant Current (CC) characteristic, as shown in fig. 3, the output voltage VIN thereof decreases, and the adapter may always operate in such a state, triggering over-temperature protection; after the output voltage of the adapter with partial constant-current-free CC characteristic is lower than a certain threshold value, the adapter can be automatically turned off and turned on again after waiting for a period of time, so that the power supply equipment can be turned off and turned on again, and the phenomenon of repeated switching occurs, as shown in fig. 4.
In the prior art, under the condition of insufficient power supply, the normal work is easy to occur, namely the over-temperature protection is started or the power is repeatedly turned on and off, the protection measures are single, the protection measures are difficult to be applied to a plurality of special working states, and the power supply or the charge and discharge are not facilitated.
Disclosure of Invention
In view of this, the present invention provides a power supply device and a charging control method thereof, which can adjust the working state of the power supply device according to the power supply capability of the adapter, and can provide protection measures in different working states and special working states of the adapter, such as insufficient power supply and overlarge power pulling.
A power supply apparatus according to the present invention includes: the control circuit is respectively connected with the control ends of the power stage circuit and the current-limiting switch, the control circuit adjusts the current-limiting switch by sampling the input current of the power supply device, and the control circuit controls the power supply conversion of the power stage circuit so as to charge the battery;
under-powering of the adapter occurs in a mode in which the adapter charges the power supply device singly: when the input voltage of the power supply device drops to a first threshold value, the power stage circuit is regulated by the control circuit to reduce the inductance current, so that the charging current of the battery by the power stage circuit is reduced.
Further, in a mode in which the adapter charges the power supply device and the power supply device simultaneously discharges the load, a case occurs in which the adapter power supply is insufficient to simultaneously supply the battery charging current and the load current, but exceeds the load current: when the input voltage of the power supply device drops to a first threshold value, the power stage circuit is regulated by the control circuit to reduce the inductance current, so that the charging current of the battery by the power stage circuit is reduced.
Further, in a mode in which the adapter charges the power supply device and the power supply device simultaneously discharges the load, a case occurs in which the adapter power supply is insufficient to supply the load current: when the input voltage drops to a first threshold value, the power stage circuit is regulated by the control circuit to enable the inductance current to be zero, so that the charging current of the battery is zero.
Further, when the input voltage is below a second threshold and its duration exceeds a threshold time, the control circuit decreases the current limit reference of the current limit switch, the second threshold being higher than the first threshold, and if the input voltage is still below the second threshold and its duration exceeds a threshold time, continues to decrease the current limit reference of the current limit switch until the input voltage is above the second threshold or the current limit reference decreases to zero.
Further, when the input voltage is lower than a third threshold value, the third threshold value is lower than the first threshold value, the adapter is judged to be disconnected, the current limiting reference of the flow switch is reduced by one step, the current limiting reference is latched, after the current limiting reference is restarted, if the power supply capacity of the adapter is insufficient to cause the input voltage to be lower than the third threshold value, the adapter is judged to be disconnected again, and the current limiting reference of the latched current limiting reference is continuously reduced by one step until the adapter is not confirmed to be disconnected any more or the current limiting reference of the current limiting switch is reduced to zero; and if the duration of the disconnection of the adapter exceeds the set time, the power supply equipment exits the charging mode and resets the current limiting reference of the current limiting switch to the maximum value.
Further, when the input voltage rises from below the second threshold and reaches the second threshold, the control circuit continues the current limiting reference of the current limiting switch to decrease by a certain amplitude.
Further, the adapter output capability is sufficient to provide the current required by the power supply device in a mode in which the adapter charges the power supply device singly: the input voltage is larger than a second threshold value, the current-limiting switch is controlled to be in a complete conduction state, and the current-limiting reference of the current-limiting switch is the maximum value; the control circuit controls the power stage circuit to charge the battery with the set charging current.
Further, in a mode in which the adapter charges the power supply device and the power supply device simultaneously discharges the load, the adapter output capability is sufficient to provide a sum of currents required by both the power supply device and the load: a. if the sum of the battery charging current and the load current is lower than the current limiting value of the current limiting switch, the adapter charges the battery with the set charging current of the power supply device and simultaneously provides the load current; b. if the battery charging current and the load current are higher than the current limiting value of the current limiting switch, the control circuit is used for adjusting the average current of the inductor so as to reduce the battery charging current and maintain the input current at the current limiting value; when the battery charging current drops to 0, the load current is still higher than the maximum current limiting value, the current limiting switch triggers overcurrent protection, and after the threshold time is exceeded, the current limiting switch is turned off.
Further, the control circuit comprises a current limiting control circuit, a control driving circuit and an inductance current control circuit, wherein the current limiting control circuit adjusts the current limiting value of the current limiting switch according to a voltage sampling signal representing the input voltage and the sampling current of the input current flowing through the current limiting switch so as to adjust the input current; the control driving circuit is connected with the control end of the power stage circuit, and the conduction state of a switching tube in the power stage circuit is regulated; the inductor current control circuit is used for adjusting the inductor current in the power stage circuit by controlling the driving circuit.
Further, the control circuit further comprises a temperature control circuit, when the temperature of the power supply equipment exceeds a set value, the temperature control circuit reduces the inductance current through the inductance current control circuit so as to reduce the charging current of the battery and reduce the temperature of the power supply equipment; in the discharge mode, when the power supply device temperature exceeds the threshold, the inductor current is also reduced, so that the output voltage is reduced, and the output power is reduced to control the temperature to further rise.
According to the invention, a charging control method comprises the following steps:
under-powering of the adapter occurs in a mode in which the adapter charges the power supply device singly: when the input voltage of the power supply device drops to a first threshold value, the power stage circuit is regulated by the control circuit to reduce the inductance current, so that the charging current of the battery by the power stage circuit is reduced.
In a mode in which the adapter charges the power supply device and the power supply device simultaneously discharges the load, a situation occurs in which the adapter power supply is insufficient to simultaneously supply the battery charging current and the load current, but exceeds the load current: when the input voltage of the power supply device drops to a first threshold value, the power stage circuit is regulated by the control circuit to reduce the inductance current, so that the charging current of the battery by the power stage circuit is reduced.
In a mode in which the adapter charges the power supply device and the power supply device simultaneously discharges the load, a situation occurs in which the adapter power supply is insufficient to supply the load current: when the input voltage drops to a first threshold value, the power stage circuit is regulated by the control circuit to enable the inductance current to be zero, so that the charging current of the battery is zero.
Further, when the input voltage is below a second threshold and the duration thereof exceeds a threshold time, the control circuit decreases the current limit reference of the current limit switch, the second threshold is higher than the first threshold, and if the input voltage is still below the second threshold and the duration thereof exceeds the threshold time, the current limit reference of the current limit switch is continuously decreased until the input voltage is higher than the second threshold or the current limit reference is decreased to zero.
A further power supply device according to the present invention includes: the control circuit is respectively connected with the control ends of the power stage circuit and the current-limiting switch, the control circuit adjusts the current-limiting switch by sampling the input current of the power supply device, and the control circuit controls the power supply conversion of the power stage circuit so as to charge the battery;
under the condition that the power supply is insufficient in the mode of single charging or simultaneous charging and discharging of the power supply equipment by the adapter:
when the current limiting reference of the current limiting switch is started, the current limiting reference of the current limiting switch is gradually increased from a preset minimum value until the input voltage is reduced to a first threshold value, the current limiting reference of the current limiting switch is reduced by one step from the current value, if the input voltage is still lower than the first threshold value, the current limiting reference is reduced by one step again until the input voltage is higher than a second threshold value or the current limiting reference is reduced to zero, and the second threshold value is higher than the first threshold value.
Further, under the condition that the adapter can appear repeatedly switching because of the power shortage: when the adapter is disconnected, the current limiting reference is reduced by one step from the current value and is latched to the maximum value of the current limiting reference; when the adapter is powered back, the current limiting reference of the current limiting switch is gradually increased from a preset minimum value, but the maximum value does not exceed the maximum value of the previous latching, and if the adapter is disconnected again in the process, the maximum value is updated to the current value, and the current value is reduced by one step and latched; until the adapter is no longer disconnected or the current limit reference is reduced to zero.
The advantage of the approach of stepping up the current limit reference from the minimum value is that the maximum power capacity of the adapter can be found faster, typically with one or several starts.
In summary, according to the power supply apparatus and the charging control method thereof of the present invention, control and adjustment of the adapter under various power supply shortage conditions are considered, the current limit value of the current limit switch is adjusted according to judgment of the input voltage under the power supply shortage conditions, and in the charge-while-discharge mode, the control is distinguished according to whether the current limit value is sufficient to supply the load current. The invention can provide protection measures in different working states and special working states of adapter load such as insufficient power supply, overlarge power pulling and the like.
Drawings
Fig. 1 is a schematic diagram showing a structure of a power supply device in the prior art;
FIG. 2 is a schematic diagram showing a state in which the adapter is normally supplying power to the power supply device;
FIG. 3 is a schematic diagram showing an adapter in a power-starved condition;
FIG. 4 is a schematic diagram showing the state of the adapter with repeated power on and power off;
fig. 5 is a schematic diagram showing the structure of the power supply device of the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention is not limited to these embodiments only. The invention is intended to cover any alternatives, modifications, equivalents, and variations that fall within the spirit and scope of the invention.
In the following description of preferred embodiments of the invention, specific details are set forth in order to provide a thorough understanding of the invention, and the invention will be fully understood to those skilled in the art without such details.
Referring to fig. 5, the power supply device based on fig. 5 comprises a power stage circuit, a current limiting switch and a control circuit, wherein the control circuit is respectively connected with control ends of the power stage circuit and the current limiting switch, the control circuit adjusts the current limiting switch by sampling input current of the power supply device, and the control circuit controls power supply conversion of the power stage circuit so as to charge a battery.
The control circuit comprises a current limiting control circuit, a control driving circuit and an inductance current control circuit, wherein the current limiting control circuit adjusts the current limiting value of the current limiting switch according to a voltage sampling signal representing the input voltage and the sampling current of the input current flowing through the current limiting switch so as to adjust the input current of the current limiting switch; the control driving circuit is connected with the control end of the power stage circuit, and the conduction state of a switching tube in the power stage circuit is regulated; the inductor current control circuit is used for adjusting the inductor current in the power stage circuit by controlling the driving circuit. Specific control methods are described below in various cases, respectively.
Single charge mode (adapter only charges battery, no power to load):
state one: the adapter operates in a constant voltage state when the adapter output capability is sufficient to provide the current required by the power supply device. Sampling by a voltage dividing circuit to obtain a voltage dividing signal representing the input voltage VIN, wherein the voltage dividing circuit is formed by connecting a resistor R1 and a resistor R2 in series, the common end of the resistor R1 and the resistor R2 is used as the output end of the voltage dividing circuit, when the voltage dividing signal is larger than a reference voltage VREF1 representing a second threshold value, the comparator 1 outputs a signal to a current limiting control circuit of a current limiting switch, the current limiting control circuit enables the current limiting switch Q1 to be in a complete conduction state, and the current limiting reference of the current limiting switch is maximum; the operational amplifier 1 outputs a signal so that the inductance average current control circuit acts on the control driving circuit to enable the circuit to charge the battery with the set charging current.
State two: when the power supply capacity of the adapter is insufficient and the pull current of the power supply equipment is overlarge, the output voltage of the adapter is reduced to work in a constant current state. When VIN drops to a first threshold VINDROOP voltage, the instantaneous value on the divider resistor R2 equals the reference voltage VREF0 that characterizes the first threshold, the output of the op amp 1 drops, the inductor current control circuit quickly down-regulates the inductor command current (i.e., the desired current), the inductor current drops, and the charging current drops, which keeps the adapter output voltage from being pulled down further. Meanwhile, if VIN is lower than VINDROOP+DeltaV voltage, VINDROOP+DeltaV is a second threshold, the voltage value on the divider resistor R2 is lower than a reference voltage VREF1 representing the second threshold, wherein VREF1 is larger than VREF0 and exceeds a threshold time t, a current-limiting reference of the current-limiting switch is reduced by DeltaI by a current-limiting control circuit of the current-limiting switch, and the current-limiting reference is latched; if VIN is still lower than VINDROOP+DeltaV, the voltage on the divider resistor R2 is still lower than the reference voltage VREF1, and after the same time period t is exceeded, the current limiting reference latched by the current limiting switch is reduced by DeltaI; and so on until the VIN voltage rises above vingloop + av or the current limit reference of the current limit switch decreases to 0. It can be seen that, in this embodiment, after the input voltage is lower than the second threshold voltage, the adjustment of the current-limiting reference is implemented in a digital monotonically stepwise manner, and the step Δi of each decrease is uniform, however, other manners may be implemented, for example, the step Δi may be monotonically decreased in an analog manner, and the step Δi may be set to be inconsistent.
If VIN voltage rises to be higher than VINDROOP+DeltaV, the current limiting reference of the current limiting switch can be continuously reduced by DeltaI and latched, so that the adapter is ensured to work in a constant voltage CV state. If the adapter is in a repeated switching phenomenon due to insufficient power supply, when the adapter is turned off once, the current limiting reference of the current limiting switch is reduced by delta I and is latched until the current limiting switch is always turned on and is not turned off any more, or the current limiting reference of the current limiting switch is reduced to 0, so that the adapter without constant current CC characteristics can normally charge the power supply equipment. In state two, the current limiting switch Q1 remains in a fully conductive state at all times.
Charging and discharging mode (adapter charging load and battery simultaneously)
State one: the power device input voltage VIN does not drop when the adapter output capability is sufficient to provide the sum of the currents required by both the power device and the load. In this state, the circuit operation can be divided into 2 cases: a. if the current sampling circuit 1 of the current limiting switch Q1 detects that the sum of the battery charging current and the load current is lower than the current limiting value of the current limiting switch, the adapter charges the battery with the charging current set by the power supply device while supplying the load current. b. If the current sampling circuit 1 of the current-limiting switch Q1 detects that the battery charging current and the load current are higher than the current-limiting value of the current-limiting switch, the current-limiting control circuit of the current-limiting switch plays a role in regulating the average current of the inductor, namely reducing the battery charging current, so that the input current is maintained at the current-limiting value; when the battery charging current drops to 0, the load current is still higher than the maximum current limiting value, the current limiting switch triggers overcurrent protection, and after a certain time is exceeded, the current limiting switch is turned off.
State two: the adapter power supply capability is insufficient to provide both battery charging current and load current, but beyond the load current, the power device input voltage VIN will drop, and the op-amp 1 will drop the battery charging current when VIN drops to VINDROOP. Meanwhile, if VIN is continuously lower than VINDROOP+DeltaV and reaches a threshold time t, the current limiting reference of the current limiting switch is reduced by DeltaI, and latching is carried out; if VIN is still lower than VINDROOP+DeltaV and the threshold time t is continuously reached, the current limiting reference latched by the current limiting switch is reduced by DeltaI again; and so on until the VIN voltage rises above vingloop + av or the current limit reference of the current limit switch decreases to 0. If VIN voltage rises to be higher than VINDROOP+DeltaV, the current limit reference of the current limit switch can be continuously reduced by DeltaI and latched, so that the adapter can be ensured to work in a constant voltage CV state.
If the adapter is in a repeated switching phenomenon due to insufficient power supply, when the adapter is turned off once, the current limiting reference of the current limiting switch is reduced by delta I and is latched until the current limiting switch is always turned on and is not turned off any more, or the current limiting reference of the current limiting switch is reduced to 0, so that the adapter without CC characteristics can normally charge the power supply equipment. In state two, the current limiting switch Q1 is always kept in a fully conductive state.
State three: the adapter power supply capability is insufficient to provide the load current, the power device input voltage VIN will drop, and when VIN drops to the first threshold VINDROOP, the op-amp 1 loop will drop the battery charging current to 0. Meanwhile, if VIN is continuously lower than a second threshold VINDROOP+DeltaV for a threshold time t, the current limiting reference of the current limiting switch is reduced by DeltaI, and latching is carried out; if the input voltage VIN is still lower than the VINDROOP+DeltaV threshold time t, the current limiting reference latched by the current limiting switch is reduced by DeltaI; and so on until the VIN voltage rises above vingloop + av or the current limit reference of the current limit switch decreases to 0. If the VIN voltage rises to be higher than VINDROOP+DeltaV, the current limiting reference of the current limiting switch can be continuously reduced by DeltaI and latched, so that the adapter works in a constant voltage CV state, but the current limiting switch can work in a current limiting state due to insufficient power supply capacity of the adapter, overcurrent protection is triggered, and the current limiting switch is turned off after a certain time is exceeded.
If the adapter is in a repeated switching phenomenon due to insufficient power supply, reducing the current limiting reference of the current limiting switch by delta I and latching when the adapter is turned off once, until the current limiting switch is always turned on and is not turned off, or the current limiting reference of the current limiting switch is reduced to 0; because the power supply capability of the adapter is insufficient to provide load current, the current limiting switch can work in a current limiting state to trigger overcurrent protection, and the current limiting switch is turned off after a certain time is exceeded.
Aiming at the phenomenon of repeated switching, the following scheme also exists, and the adapter can appear under the condition of repeated switching due to insufficient power supply: when the adapter is disconnected, the current limiting reference is reduced by one step from the current value and is latched to the maximum value of the current limiting reference; when the adapter is powered back, the current limiting reference of the current limiting switch is gradually increased from a preset minimum value, but the maximum value does not exceed the maximum value of the previous latching, and if the adapter is disconnected again in the process, the maximum value is updated to the current value, and the current value is reduced by one step and latched; until the adapter is no longer disconnected or the current limit reference is reduced to zero.
The repeated switching-on/off condition is mainly that when the input voltage is lower than a third threshold value, the third threshold value is lower than the first threshold value, the adapter is judged to be disconnected, at the moment, the adapter is not necessarily disconnected completely or is not output completely, the power supply equipment confirms and judges the condition as the adapter to be disconnected, the current limiting reference of the current limiting switch is lowered by one step, the current limiting reference is latched, after the current limiting reference is restarted, if the power supply capacity of the adapter is insufficient, the adapter is judged to be disconnected again, and the adapter is continuously lowered by one step on the latched current limiting reference until the adapter is not confirmed to be disconnected any more or the current limiting reference of the current limiting switch is reduced to zero. This part of the embodiments is equally applicable to other embodiments and applications.
On the basis of the scheme, the following improvement scheme is also available, and is suitable for the condition of insufficient power supply in the mode of single charging or simultaneous charging and discharging of the power supply equipment by the adapter:
when the current limiting reference of the current limiting switch is started, the current limiting reference of the current limiting switch is gradually increased from a preset minimum value until the input voltage is reduced to a first threshold value, the current limiting reference of the current limiting switch is reduced by one step from the current value, if the input voltage is still lower than the first threshold value, the current limiting reference is reduced by one step again until the input voltage is higher than a second threshold value or the current limiting reference is reduced to zero, and the second threshold value is higher than the first threshold value. The current limit reference may be reduced further when the input voltage rises above the second threshold from below the second threshold.
The invention provides a battery charge and discharge control strategy, which is also added with temperature control, thereby further improving the performance and reliability of the system. When the chip is in a single charging mode or a charging-discharging-while-charging mode, and when the temperature of the chip exceeds a set value, the temperature control circuit participates in the control of the inductance current limiting loop, so that the charging current of the battery is reduced, and the temperature of the chip is in a controlled range. In the discharging mode, when the chip temperature exceeds the threshold value, the control circuit also reduces the average current limit of the inductor, so that the output voltage VOUT is reduced, the output power is reduced, and the chip temperature is prevented from further rising.
In addition, although the embodiments are described and illustrated separately above, it will be apparent to those skilled in the art that some common techniques may be substituted and integrated between the embodiments, and that reference may be made to another embodiment without explicitly recited in one of the embodiments.
While the preferred embodiments in accordance with the present invention have been described in detail, the circuitry and advantages of the patent should not be construed as limited to the above description, but the disclosed embodiments and drawings can be better understood, therefore, the above-described embodiments and the accompanying drawings are for better understanding of the present invention, the present invention is not limited to the scope of the embodiments disclosed, and alterations and modifications to the embodiments of the present invention will be within the scope of the invention by those skilled in the art.
Claims (11)
1. A power supply apparatus comprising: the control circuit is respectively connected with the control ends of the power stage circuit and the current-limiting switch, the control circuit adjusts the current-limiting switch by sampling the input current of the power supply device, and the control circuit controls the power supply conversion of the power stage circuit so as to charge the battery;
under-powering of the adapter occurs in a mode in which the adapter charges the power supply device singly: when the input voltage drops to a first threshold value, the power stage circuit is regulated by the control circuit to reduce the inductance current, so that the charging current of the power stage circuit to the battery is reduced;
when the input voltage is lower than a second threshold value and the duration exceeds a threshold time, the control circuit reduces the current limiting reference of the current limiting switch, wherein the second threshold value is higher than a first threshold value, and if the input voltage is still lower than the second threshold value and the duration exceeds the threshold time, the current limiting reference of the current limiting switch is continuously reduced until the input voltage is higher than the second threshold value or the current limiting reference is reduced to zero;
when the input voltage rises from below the second threshold and reaches the second threshold, the control circuit continues to reduce the current limiting reference of the current limiting switch by a certain amplitude.
2. The power supply apparatus according to claim 1, wherein in a mode in which the power supply apparatus is charged by the adapter and the load is discharged by the power supply apparatus at the same time, a case occurs in which the adapter power supply is insufficient to supply the battery charging current and the load current at the same time, but exceeds the load current: when the input voltage of the power supply device drops to a first threshold value, the power stage circuit is regulated by the control circuit to reduce the inductance current, so that the charging current of the battery by the power stage circuit is reduced.
3. The power supply apparatus according to claim 2, wherein in a mode in which the adapter charges the power supply apparatus and the power supply apparatus simultaneously discharges the load, a case occurs in which the adapter power supply is insufficient to supply the load current: when the input voltage drops to a first threshold value, the power stage circuit is regulated by the control circuit to enable the inductance current to be zero, so that the charging current of the battery is zero.
4. A power supply device according to claim 1, 2 or 3, wherein when the input voltage is lower than a third threshold value, the third threshold value is lower than the first threshold value, the adapter is judged to be disconnected, the current limit reference of the current limit switch is lowered by one step, the current limit reference is latched, after the current limit switch is restarted, if the input voltage is lower than the third threshold value due to insufficient power supply capacity of the adapter, the adapter is judged to be disconnected again, and the lowering is continued by one step on the latched current limit reference until the adapter is no longer confirmed to be turned off or the current limit reference of the current limit switch is reduced to zero; and if the duration of the disconnection of the adapter exceeds the set time, the power supply equipment exits the charging mode and resets the current limiting reference of the current limiting switch to the maximum value.
5. A power supply device according to claim 1 or 2 or 3, wherein the adapter output capability is sufficient to provide the current required by the power supply device in a mode in which the adapter charges the power supply device singly: the input voltage is larger than a second threshold value, the current-limiting switch is controlled to be in a complete conduction state, and the current-limiting reference of the current-limiting switch is the maximum value; the control circuit controls the power stage circuit to charge the battery with the set charging current.
6. A power supply device as claimed in claim 1, 2 or 3, wherein in a mode in which the power supply device is charged by the adapter and the load is discharged by the power supply device simultaneously, the adapter output capability is sufficient to provide the sum of the currents required by both the power supply device and the load: a. if the sum of the battery charging current and the load current is lower than the current limiting reference of the current limiting switch, the adapter charges the battery with the charging current set by the power supply device and simultaneously provides the load current; b. if the sum of the battery charging current and the load current is higher than the current limiting value of the current limiting switch, the average current of the inductor is regulated by the control circuit so as to reduce the battery charging current and maintain the input current at the current limiting value; when the charging current of the battery drops to zero, the load current is still higher than the maximum current limiting value, the current limiting switch triggers overcurrent protection, and the current limiting switch is turned off after the threshold time is exceeded.
7. A power supply apparatus according to claim 1, 2 or 3, wherein the control circuit comprises a current limit control circuit, a control drive circuit and an inductor current control circuit, the current limit control circuit adjusting a current limit reference of the current limit switch in dependence on a voltage sample signal representative of the input voltage and a sample current of the input current flowing through the current limit switch to adjust the input current of the current limit switch; the control driving circuit is connected with the control end of the power stage circuit and used for adjusting the conduction state of a switching tube in the power stage circuit; the inductor current control circuit is used for adjusting the inductor current in the power stage circuit by controlling the driving circuit.
8. The power supply apparatus according to claim 7, wherein the control circuit further comprises a temperature control circuit, and when the temperature of the power supply apparatus exceeds a set value, the temperature control circuit decreases the inductor current through the inductor current control circuit to decrease the charging current of the battery, so that the temperature of the power supply apparatus is decreased; in the discharging mode, when the temperature of the power supply device exceeds a threshold value, the inductance current is reduced, so that the output voltage is reduced, and the output power is reduced.
9. A charging control method of a power supply apparatus, comprising the steps of:
the condition that the power supply of the adapter is insufficient occurs in the mode that the adapter charges the power supply device singly: when the input voltage drops to a first threshold value, the power stage circuit is regulated by the control circuit to reduce the inductance current, so that the charging current of the power stage circuit to the battery is reduced;
in a mode in which the adapter charges the power supply device and the power supply device simultaneously discharges the load, a situation occurs in which the adapter power supply is insufficient to simultaneously supply the battery charging current and the load current, but exceeds the load current: when the input voltage drops to a first threshold value, the power stage circuit is regulated by the control circuit to reduce the inductance current, so that the charging current of the power stage circuit to the battery is reduced;
in a mode in which the adapter charges the power supply device and the power supply device simultaneously discharges the load, a situation occurs in which the adapter power supply is insufficient to supply the load current: when the input voltage drops to a first threshold value, the power stage circuit is regulated by the control circuit to enable the inductance current to be zero, so that the charging current to the battery is zero;
when the input voltage is lower than a second threshold value and the duration exceeds a threshold time, the control circuit reduces the current limiting reference of the current limiting switch, wherein the second threshold value is higher than the first threshold value, and if the input voltage is still lower than the second threshold value and the duration exceeds the threshold time, the current limiting reference of the current limiting switch is continuously reduced until the input voltage is higher than the second threshold value or the current limiting reference is reduced to zero;
when the input voltage rises from below the second threshold and reaches the second threshold, the control circuit continues to reduce the current limiting reference of the current limiting switch by a certain amplitude.
10. A power supply apparatus comprising: the control circuit is respectively connected with the control ends of the power stage circuit and the current-limiting switch, the control circuit adjusts the current-limiting switch by sampling the input current of the power supply device, and the control circuit controls the power supply conversion of the power stage circuit so as to charge the battery;
under the condition that the power supply is insufficient in the mode of single charging or simultaneous charging and discharging of the power supply equipment by the adapter:
when the current limiting reference of the current limiting switch is started, the current limiting reference of the current limiting switch is gradually increased from a preset minimum value until the input voltage is reduced to a first threshold value, the current limiting reference of the current limiting switch is reduced by one step from the current value, if the input voltage is still lower than the first threshold value, the current limiting reference is reduced by one step again until the input voltage is higher than a second threshold value or the current limiting reference is reduced to zero, and the second threshold value is higher than the first threshold value.
11. The power supply apparatus according to claim 10, characterized in that:
under the condition that the adapter can appear repeatedly switching because of the power supply is not enough: when the adapter is disconnected, the current limiting reference is reduced by one step from the current value and is latched to the maximum value of the current limiting reference; when the adapter is powered back, the current limiting reference of the current limiting switch is gradually increased from a preset minimum value, but the maximum value does not exceed the maximum value of the previous latching, and if the adapter is disconnected again in the process, the maximum value is updated to the current value, and the current value is reduced by one step and latched; until the adapter is no longer disconnected or the current limit reference is reduced to zero.
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| CN109888897B (en) * | 2019-02-21 | 2021-08-31 | 深圳市电将军科技有限公司 | Charging control method, charging control device and power adapter |
| CN109995114B (en) * | 2019-04-17 | 2023-09-01 | 南京矽力微电子技术有限公司 | Self-adaptive charging circuit and charging method |
| CN110456147B (en) * | 2019-08-29 | 2021-12-24 | 无锡睿勤科技有限公司 | Wattage information acquisition method and device of power adapter and electronic equipment |
| EP4191816A4 (en) * | 2020-08-17 | 2023-09-20 | Huawei Digital Power Technologies Co., Ltd. | Charging circuit, terminal device, adapter, and charging system and method |
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