CN219833791U

CN219833791U - Power supply control device and charging and discharging system

Info

Publication number: CN219833791U
Application number: CN202320671093.5U
Authority: CN
Inventors: 请求不公布姓名
Original assignee: Guangdong Shunshi Measurement and Control Equipment Co Ltd
Current assignee: Guangdong Shunshi Measurement and Control Equipment Co Ltd
Priority date: 2023-03-30
Filing date: 2023-03-30
Publication date: 2023-10-13
Anticipated expiration: 2033-03-30

Abstract

The utility model provides a power supply control device and a charging and discharging system, wherein the power supply control device comprises: the resistive shunt is arranged in a charge-discharge loop, and the charge-discharge loop is formed by a power supply and a load; a temperature detection circuit for detecting the temperature of the resistive shunt and outputting a temperature detection signal; a voltage detection circuit electrically connected to the resistive shunt for detecting a voltage of the resistive shunt and outputting a voltage detection signal; the singlechip control circuit is electrically connected with the temperature detection circuit and the voltage detection circuit respectively and is used for being electrically connected with a power supply; the singlechip control circuit is used for calculating a real-time current value of the charge-discharge loop according to the temperature detection signal and the voltage detection signal, and outputting a power supply driving signal to the power supply based on the real-time current value so as to control the output voltage or the output current of the power supply. By adopting the scheme of the utility model, the cost can be reduced.

Description

Power supply control device and charging and discharging system

Technical Field

The present utility model relates to the field of power control technologies, and in particular, to a power control device and a charging and discharging system.

Background

With the rising and wide application of new energy industry, in order to avoid the damage of devices caused by unstable battery charging current, a digital power supply arranged in charging and discharging equipment needs to meet higher current precision requirements. To achieve this, the charging and discharging device needs to monitor the real-time current in the charging loop to dynamically adjust the output of the digital power supply according to the real-time current, so that the charging current can fluctuate within a safe range.

Currently, the charging and discharging device generally samples real-time current through a resistive shunt. However, since the device temperature of the resistive shunt increases with the increase of the charging current or the charging voltage, and the actual resistance value thereof changes with the change of the device temperature, there is a large deviation between the sampling current value and the actual current value calculated by the charging and discharging device according to the fixed resistance value, thereby affecting the current stability and the accuracy of the charging current.

For the problem of inaccurate sampling current caused by the change of the resistance value of the resistive shunt, two modes are generally adopted to solve the problem in the prior art. One of the ways is to arrange a heat radiation component such as a fan in the charge-discharge equipment, and the heat radiation component is used for enhancing the heat radiation of the resistance type shunt, so that the device temperature of the resistance type shunt is prevented from being changed greatly as much as possible. However, this approach requires either an increase in power of the original heat sink assembly or a separate provision of the heat sink assembly for the flow splitter, and requires consideration of the specific design of the heat sink channels in the early design layout of the device, which increases costs. And the other mode is to perform reasonable device type selection in the design stage, and control precision is improved by selecting a low-temperature-drift resistance type shunt. However, this approach requires significant time and cost for device model selection on the one hand and low temperature drift devices on the other hand, which corresponds to high costs.

It can be seen that the prior art has the problem of excessive cost.

Disclosure of Invention

The object of the present utility model is to solve at least one of the above-mentioned technical drawbacks, in particular the technical drawbacks of the prior art which are too costly.

In a first aspect, an embodiment of the present utility model provides a power control apparatus, including:

the resistive shunt is arranged in a charge-discharge loop, and the charge-discharge loop is formed by a power supply and a load;

a temperature detection circuit for detecting the temperature of the resistive shunt and outputting a temperature detection signal;

the voltage detection circuit is electrically connected with the resistive shunt and is used for detecting the voltage of the resistive shunt and outputting a voltage detection signal;

the singlechip control circuit is electrically connected with the temperature detection circuit and the voltage detection circuit respectively and is used for being electrically connected with the power supply;

the singlechip control circuit is used for calculating a real-time current value of the charge-discharge loop according to the temperature detection signal and the voltage detection signal, and outputting a power supply driving signal to the power supply based on the real-time current value so as to control the output voltage or the output current of the power supply.

In one embodiment, the temperature detection circuit includes:

a temperature detection sensor for sampling the temperature of the resistive shunt and outputting a temperature sampling signal;

and the analog-to-digital conversion module is respectively and electrically connected with the temperature detection sensor and the singlechip control circuit and is used for performing analog-to-digital conversion on the temperature sampling signal so as to obtain the temperature detection signal.

In one embodiment, the analog-to-digital conversion module includes:

the first voltage following unit is used for being electrically connected with a reference power supply; the first voltage following unit is used for carrying out voltage following on the reference voltage provided by the reference power supply and outputting a first following voltage;

the second voltage following unit is electrically connected with the temperature detection sensor and is used for carrying out voltage following on the temperature sampling signal and outputting a second following voltage;

the analog-to-digital conversion chip is electrically connected with the first voltage following unit, the second voltage following unit and the singlechip control circuit respectively and is used for carrying out differential analog-to-digital conversion on the first following voltage and the second following voltage so as to obtain the temperature detection signal.

In one embodiment, the first voltage follower unit includes a first resistor, a second resistor, a third resistor, a fourth resistor, and a first operational amplifier;

the first end of the first resistor is used for being electrically connected with the reference power supply, the second end of the first resistor is electrically connected with the normal phase input end of the first operational amplifier and the first end of the second resistor respectively, and the second end of the second resistor is used for being grounded;

the output end of the first operational amplifier is electrically connected with the inverting input end of the first operational amplifier, the first end of the third resistor and the first end of the fourth resistor respectively; the second end of the third resistor is electrically connected with the first input end of the second voltage following unit, and the second end of the fourth resistor is electrically connected with the analog-to-digital conversion chip.

In one embodiment, the first voltage follower unit further includes a first capacitor and a second capacitor;

the first end of the first capacitor is electrically connected with the first power supply connection end of the first operational amplifier, and the second end of the first capacitor is used for being grounded; the first end of the second capacitor is electrically connected with the second power supply connection end of the first operational amplifier, and the second end of the second capacitor is used for being grounded.

In one embodiment, the second voltage follower unit includes a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, and a second operational amplifier;

the first end of the fifth resistor is electrically connected with the second end of the third resistor, and the second end of the fifth resistor is respectively and electrically connected with the first end of the sixth resistor, the first end of the seventh resistor and the non-inverting input end of the second operational amplifier;

the output end of the second operational amplifier is electrically connected with the inverting input end of the second operational amplifier and the first end of the eighth resistor respectively, and the second end of the eighth resistor is electrically connected with the analog-to-digital conversion chip; the second end of the sixth resistor is used for being grounded, and the second end of the seventh resistor is electrically connected with the temperature detection sensor.

In one embodiment, the second voltage follower unit includes a third capacitor and a fourth capacitor;

the first end of the third capacitor is electrically connected with the first power supply connection end of the second operational amplifier, and the second end of the third capacitor is used for being grounded; the first end of the fourth capacitor is electrically connected with the second power supply connection end of the second operational amplifier, and the second end of the fourth capacitor is used for being grounded.

In one embodiment, the analog-to-digital conversion chip is a CS1239 model chip.

In one embodiment, the temperature detection sensor is attached to a surface of the resistive shunt.

In a second aspect, an embodiment of the present utility model provides a charging and discharging system, including:

the power supply is used for electrically connecting a load and forming a charge-discharge loop with the load so as to charge the load;

the power supply control device according to any one of the embodiments, wherein the single-chip microcomputer control circuit of the power supply control device is electrically connected with the power supply.

In the power supply control device and the charge-discharge system of the present utility model, a temperature detection circuit may be employed to detect the temperature of the resistive shunt and output a temperature detection signal, and a voltage detection circuit may be employed to detect the voltage of the resistive shunt and output a voltage detection signal. Therefore, the singlechip control circuit can determine the real-time resistance of the resistive shunt according to the temperature detection signal and the temperature drift coefficient of the resistive shunt, calculate the real-time current value of the charge-discharge loop according to the real-time resistance and the voltage detection signal, and regulate and control the charge-discharge loop based on the real-time current value. Therefore, the current stability and the accuracy can be ensured without depending on a heat radiation component or a high-cost low-temperature drift shunt, so that the time cost and the device cost of the power supply control device can be reduced. In addition, the utility model realizes the power supply control by adopting the singlechip control circuit with lower cost, thereby further reducing the cost of the device.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the utility model, and that other drawings can be obtained from these drawings without inventive faculty for a person skilled in the art.

FIG. 1 is a schematic block diagram of a power control device in one embodiment;

FIG. 2 is a circuit diagram of a first voltage follower cell in one embodiment;

FIG. 3 is a circuit diagram of a second voltage follower cell in one embodiment;

FIG. 4 is a circuit diagram of a voltage detection circuit in one embodiment;

FIG. 5 is a circuit diagram of a level shifting block in one embodiment;

fig. 6 is a circuit diagram of a first switch driving module and/or a second switch driving module in one embodiment.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In one embodiment, the present utility model provides a power control device. As shown in fig. 1, the power control device may include a resistive shunt 110, a temperature detection circuit 120, a voltage detection circuit 130, and a single chip microcomputer control circuit 140. The resistive shunt 110 is a device capable of shunting based on the principle of resistance, and may be implemented by directly using one or more resistors, for example. The temperature detection circuit 120 is a circuit block that can be used for real-time temperature detection, and the voltage detection circuit 130 is a circuit block that can be used for real-time voltage detection. It will be appreciated that the specific circuit structures of the temperature detection module and the voltage detection module may be determined according to practical situations, and may be implemented by any circuit structure in the prior art, which is not specifically limited herein.

The single-chip microcomputer control circuit 140 is a circuit module which is realized by a single-chip microcomputer and has a control function. It will be appreciated that the present utility model may be implemented using any principle and any type of single-chip microcomputer to implement the single-chip microcomputer control circuit 140, which is not specifically limited herein. In one example, the SCM control circuit 140 may be implemented based on an STM32 SCM, or based on a digital core controller, which may be a TMS320 series of SCMs.

In the power supply control device of the present utility model, the resistive shunt 110 may be provided in the charge-discharge circuit. The charge-discharge loop refers to a loop formed by a power supply and a load. Specifically, when the charge-discharge system charges and discharges the load, the power supply in the system and the load form a loop to charge and discharge the load. And the resistive shunt 110 may be disposed in this loop such that the voltage of the resistive shunt 110 may reflect the charge-discharge current in the charge-discharge loop. It will be appreciated that the specific location of the resistive shunt 110 in the charge-discharge loop may be determined according to practical situations, for example, according to the connection relationship between the power supply and the load, which is not limited herein.

The temperature detection circuit 120 may be configured to detect a temperature of the resistive shunt 110 and output a temperature detection signal according to the detected temperature data, such that the temperature detection signal may reflect a real-time temperature of the resistive shunt 110. And the voltage detection circuit 130 may be electrically connected to the resistive shunt 110 to detect a voltage drop across the resistive shunt 110 and output a corresponding voltage detection signal. In one embodiment, the voltage detection circuit 130 may obtain the voltage detection signal by proportional conversion of the current signal sampled by the resistive shunt 110.

The single chip microcomputer control circuit 140 is electrically connected to the temperature detection circuit 120 and the voltage detection circuit 130, respectively, so that the temperature detection signal output by the temperature detection circuit 120 and the voltage detection signal output by the voltage detection circuit 130 can be obtained, respectively. Because the real-time resistance of the resistive shunt 110 is related to the device temperature thereof, the singlechip control circuit 140 can determine the real-time resistance of the resistive shunt 110 according to the temperature detection signal and the temperature drift coefficient after acquiring the temperature detection signal, and determine the real-time current value in the charge-discharge loop according to the real-time resistance and the voltage detection signal.

The single-chip microcomputer control circuit 140 is also used for being connected with a power supply. After determining the real-time current value of the charge-discharge loop, the singlechip control circuit 140 may determine a power driving signal according to the real-time current value, and output the power driving signal to the power supply to control the output voltage and/or the output current of the power supply, so as to implement current compensation, thereby ensuring that the error between the real-time current value in the charge-discharge loop and the set value is within a preset range.

It should be noted that, herein, the calculation of the real-time current value according to the temperature detection signal and the voltage detection signal, and the determination of the power driving signal according to the real-time current value may be implemented by any algorithm or control procedure disclosed in the prior art, which is not specifically limited herein.

The present utility model employs the temperature detection circuit 120 to detect the temperature of the resistive shunt 110 and output a temperature detection signal, and employs the voltage detection circuit 130 to detect the voltage of the resistive shunt 110 and output a voltage detection signal. Thus, the single-chip microcomputer control circuit 140 can determine the real-time resistance of the resistive shunt 110 according to the temperature detection signal and the temperature drift coefficient of the resistive shunt 110, calculate the real-time current value of the charge-discharge loop according to the real-time resistance and the voltage detection signal, and regulate and control based on the real-time current value. Therefore, the current stability and the accuracy can be ensured without depending on a heat radiation component or a high-cost low-temperature drift shunt, so that the time cost and the device cost of the power supply control device can be reduced. In addition, the utility model realizes the power supply control by adopting the singlechip control circuit 140 with lower cost, thereby further reducing the cost of the device.

In one embodiment, the temperature detection circuit 120 may include a temperature detection sensor and an analog-to-digital conversion module. The temperature detection sensor refers to a sensor device capable of being used for temperature detection, and the specific model of the temperature detection sensor can be selected according to actual requirements such as cost, detection precision and/or device size, and the like, and the temperature detection sensor is not particularly limited herein. The analog-to-digital conversion module refers to a module for being able to convert an analog signal into a digital signal. It will be appreciated that the specific arrangement relationship of the temperature detecting sensor may also be determined according to the actual situation, and in one example, the temperature detecting sensor may be attached to the surface of the resistive shunt 110, so as to more accurately collect the temperature of the resistive shunt 110.

Specifically, the temperature detection sensor may be used to sample the temperature of the resistive shunt 110 and output a temperature sampling signal. Wherein the temperature sampling signal is an analog signal. The analog-to-digital conversion module is electrically connected to the temperature detection sensor and the single-chip microcomputer control circuit 140, respectively, and is configured to obtain a temperature sampling signal output by the temperature detection sensor, and perform analog-to-digital conversion on the temperature sampling signal to obtain a temperature detection signal. The temperature detection signal is a digital signal. The analog-to-digital conversion module can output a temperature detection signal to the singlechip control circuit 140, so that the singlechip control circuit 140 can perform subsequent calculation and control based on the digital signal, thereby avoiding the problem that information cannot be identified due to improper input signals, ensuring the normal operation of the control process, and further improving the stability of current.

In one embodiment, the analog-to-digital conversion module may include a first voltage follower unit, a second voltage follower unit, and an analog-to-digital conversion chip. The first voltage following unit and the second voltage following unit are both circuit structures for voltage following, and the analog-to-digital conversion chip is a chip with a differential analog-to-digital conversion function.

It will be appreciated that the specific model of the analog-to-digital conversion chip may be determined according to actual requirements, and this is not particularly limited herein. In one example, the analog-to-digital conversion chip may be a CS1239 model chip. The CS1230 chip is provided with a plurality of voltage input ends, so that the analog-to-digital conversion chip can perform analog-to-digital conversion on a plurality of analog signals, and the expansion is finished, thereby being convenient for connection. On the other hand, the CS1239 model chip can finish more accurate data conversion, and can further improve the stability and the precision of current while reducing the cost.

In particular, the first voltage follower unit may be adapted to be electrically connected to a reference power supply for providing a reference voltage for reference of the differential analog-to-digital conversion. The first voltage follower unit may voltage-follow the reference voltage and output a first follow voltage. The second voltage following unit is electrically connected with the temperature detection sensor and is used for carrying out voltage following on the temperature sampling signal output by the temperature detection sensor and outputting a second following voltage. The analog-to-digital conversion chip can be electrically connected with the first voltage following unit, the second voltage following unit and the single chip microcomputer control circuit 140 respectively, so that the first following voltage and the second following voltage can be obtained, and differential analog-to-digital conversion is performed on the first following voltage and the second following voltage to obtain a temperature detection signal.

In this embodiment, the first voltage following unit is used to follow the reference voltage, and the second voltage following unit is used to follow the temperature sampling signal, so that stability of the reference voltage and the temperature sampling signal can be improved, and accuracy of the analog-to-digital conversion result can be improved. On the other hand, compared with the scheme of directly converting the level of the temperature sampling signal, the temperature detection signal obtained by conversion can more accurately reflect the real-time temperature of the resistive shunt 110 by adopting differential analog-to-digital conversion.

In one embodiment, the first voltage follower unit may include a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, and a first operational amplifier U1. As shown in fig. 2, the first terminal ref_1 of the first resistor R1 may be used to electrically connect to a reference power supply, and when the first resistor R1 is connected to the reference power supply, the voltage at the first terminal ref_1 is the reference voltage. The second end of the first resistor R1 may be electrically connected to the first end of the second resistor R2 and the non-inverting input end of the first operational amplifier U1, respectively, and the second end of the second resistor R2 may be used for grounding.

The inverting input end of the first operational amplifier U1 is connected to the output end of the first operational amplifier U1, and the output end of the first operational amplifier U1 is electrically connected to the first end of the third resistor R3 and the first end of the fourth resistor R4, respectively. The second terminal ref_2 of the third resistor R3 may be connected to the first input terminal of the second voltage follower cell. The second terminal ref_3 of the fourth resistor R4 may be electrically connected to the analog-to-digital conversion chip, and further may be connected to a reference voltage input terminal of the analog-to-digital conversion chip.

Therefore, the first voltage following unit can be realized through the operational amplifier and the resistor, the circuit structure is simple, the realization cost is low, and the device cost can be further reduced.

In one embodiment, the first operational amplifier U1 may include two power supply connections, a first power supply connection and a second power supply connection, respectively. One of the first power supply connection terminal and the second power supply connection terminal is used for connecting a positive power supply, and the other is used for connecting a negative power supply, so that the first operational amplifier U1 can work based on a positive voltage provided by the positive power supply and a negative voltage provided by the negative power supply.

As shown in fig. 2, the first voltage follower unit may further include a first capacitor C1 and a second capacitor C2. The first end of the first capacitor C1 is electrically connected to the first power connection end of the first operational amplifier U1, and the first end of the second capacitor C2 is electrically connected to the second power connection end of the first operational amplifier U1. The second end of the first capacitor C1 and the second end of the second capacitor C2 are both used for grounding. Therefore, the first capacitor C1 and the second capacitor C2 can be used for carrying out power supply filtering on the first operation discharger, and then the voltage following effect is improved.

In one embodiment, as shown in fig. 2, the first voltage follower unit may further include a fifth capacitor C5 and a sixth capacitor C6, where a first end of the fifth capacitor C5 is connected to the second end of the first resistor R1, a first end of the sixth capacitor C6 is connected to the first end of the third resistor R3, and both the second end of the fifth capacitor C5 and the second end of the sixth capacitor C6 are used for grounding. In this way, the non-inverting input of the first operational amplifier U1 may be filtered by the fifth capacitor C5, and the output of the first operational amplifier U1 may be filtered by the sixth capacitor C6, so as to further improve the voltage following effect.

In one embodiment, the second voltage following unit may include a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, and a second operational amplifier U2. As shown in fig. 3, the first end of the fifth resistor R5 is electrically connected to the second end of the third resistor R3, and the second end of the fifth resistor R5 is electrically connected to the first end of the sixth resistor R6, the first end of the seventh resistor R7, and the non-inverting input terminal of the second operational amplifier U2, respectively. The second end ts_1 of the seventh resistor R7 is electrically connected to the temperature detection sensor.

The inverting input terminal of the second operational amplifier U2 is electrically connected to the output terminal of the second operational amplifier U2, and the output terminal of the second operational amplifier U2 is electrically connected to the first terminal of the eighth resistor R8. The second terminal ts_2 of the eighth resistor R8 is used as an output terminal of the second following voltage, and is electrically connected to the analog-to-digital conversion chip.

Therefore, the second voltage following unit can be realized through the operational amplifier and the resistor, the circuit structure is simple, the realization cost is low, and the device cost can be further reduced.

In one embodiment, the second operational amplifier U2 may include two power supply terminals, namely a first power supply terminal and a second power supply terminal, and the specific description of the two power supply terminals of the second operational amplifier U2 may refer to the related description of the first operational amplifier U1, which is not repeated herein.

As shown in fig. 3, the second voltage follower unit may further include a third capacitor C3 and a fourth capacitor C4. The first end of the third capacitor C3 is electrically connected to the first power supply connection end of the second operational amplifier U2, and the first end of the fourth capacitor C4 is electrically connected to the second power supply connection end of the second operational amplifier U2. The second end of the third capacitor C3 and the second end of the fourth capacitor C4 are both used for grounding. Therefore, the third capacitor C3 and the fourth capacitor C4 can be used for carrying out power supply filtering on the second operation discharger, and further the voltage following effect is improved.

In one embodiment, as shown in fig. 3, the third voltage follower unit may further include a seventh capacitor C7 and an eighth capacitor C8, wherein a first end of the seventh capacitor C7 is electrically connected to the non-inverting input terminal of the second operational amplifier U2, a first end of the eighth capacitor C8 is electrically connected to the output terminal of the second operational amplifier U2, and a second end of the seventh capacitor C7 and a second end of the eighth capacitor C8 are both used for grounding. In this way, the non-inverting input of the second operational amplifier U2 may be filtered by the seventh capacitor C7, and the output of the second operational amplifier U2 may be filtered by the eighth capacitor C8, so as to further improve the voltage following effect.

In one embodiment, the specific circuit structure of the voltage detection circuit 130 may be as shown in fig. 4. The voltage detection circuit 130 is implemented based on the fully differential operational amplifier U3 to suppress common mode interference and reduce distortion so that the voltage detection circuit 130 can more accurately collect the voltage of the resistive shunt 110. As shown in fig. 4, the first input terminal VOCM of the fully differential operational amplifier U3 is used as a reference voltage input terminal, and the voltage thereof may be 5V. The second input in+ of the fully differential operational amplifier U3 may be a positive current input and the third input IN-of the fully differential operational amplifier U3 may be a negative current input. The positive current input terminal and the negative current input terminal can be connected into a charge-discharge loop to obtain a positive current and a reverse current respectively. The voltage difference between the first output terminal OUT+ and the second output terminal OUT-of the fully-differential operational amplifier U3 may be used as a voltage detection signal as described herein to reflect the voltage across the resistive shunt 110.

In one embodiment, the single chip microcomputer control circuit 140 may include a single chip microcomputer, a level conversion module, a first switch, a second switch, a first switch driving unit, and a second switch driving unit. The single chip microcomputer is respectively and electrically connected with the first switch driving unit and the second switch driving unit, the first switch driving unit is respectively and electrically connected with the level conversion module and the driving end of the first switch tube, the first end of the first switch tube is used as a pulse high-level input end, and the second end of the first switch tube is used for being connected with a power supply. The second switch driving unit is respectively and electrically connected with the level conversion module and the driving end of the second switch tube, the first end of the second switch tube is used as a pulse low-level input end, and the second end of the second switch tube is used for being connected with a power supply.

The specific description of the single chip microcomputer can refer to the above embodiments, and is not repeated herein. The level conversion module, the first driving unit and the second driving unit form a pulse regulating circuit. The level conversion module refers to a circuit structure for converting a first voltage input from the outside into a second voltage and a third voltage, respectively, wherein the second voltage is not equal to the third voltage, for example, the second voltage may be 15 volts, and the third voltage may be-5 volts.

In one example, the circuit structure of the level shift module may be as shown in fig. 5. As shown in fig. 5, the first input terminal V1 and the second input terminal V2 of the level shift module are available as the first voltage input terminal. The level conversion module may include 2 level conversion subunits, wherein the voltages of the first output terminals of the two level conversion subunits are 15V, and the voltages of the second output terminals of the two level conversion subunits are-5V. In the two level conversion subunits, the two output terminal voltages of one level conversion subunit are used for driving the first switching tube, and the two output terminal voltages of the other level conversion subunit are used for driving the second switching tube.

The singlechip can output a high-level control signal to the first switch driving unit and a low-level control signal to the second switch driving unit respectively according to the real-time current value. The first switch driving unit is used for outputting corresponding on-off control signals to the first switch according to the high-level control signals, and further controlling the output of the high-level signals. Similarly, the second switch driving unit is used for outputting a corresponding on-off control signal to the second switch according to the low-level control signal, and further controlling the output of the low-level signal. The singlechip can output corresponding pulse signals to the power supply by alternately conducting the first switch and the second switch, so that the output voltage and/or the output current of the power supply can be controlled.

In one example, the circuit structures of the first switch driving unit and the second switch driving unit may both refer to fig. 6. Further, the switch driving chip U4 can be realized by adopting a single-channel isolation driving chip compatible with an optocoupler, such as a chip of the model SLM343 CK-DG. In fig. 6, ctrl is a port connected to a single chip microcomputer, and Gate is a port connected to a switching tube.

In an embodiment, the embodiment of the utility model further provides a charging and discharging system, which comprises a power supply and the power supply control device in any embodiment. The power supply is used for electrically connecting with a load and forming a charge-discharge loop with the load so as to charge the load. Further, the power supply may be a digital power supply. The singlechip control circuit in the power supply control device is electrically connected with the power supply. The specific description of each component of the power control device can refer to the above embodiment, and will not be repeated here.

Therefore, the current stability and the accuracy can be ensured without depending on a heat radiation component or a high-cost low-temperature drift shunt, so that the time cost and the device cost of the power supply control device can be reduced. In addition, the utility model realizes the power supply control by adopting the singlechip control circuit with lower cost, thereby further reducing the cost of the device.

Finally, it is further noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

Herein, "a," "an," "the," and "the" may also include plural forms, unless the context clearly indicates otherwise. Plural means at least two cases such as 2, 3, 5 or 8, etc. "and/or" includes any and all combinations of the associated listed items. Reference herein to "connected" is to be understood as "electrically connected," "communicatively connected," etc., if the connected circuits, modules, units, etc., have electrical or data transfer between them.

In the present specification, each embodiment is described in a progressive manner, and each embodiment focuses on the difference from other embodiments, and may be combined according to needs, and the same similar parts may be referred to each other.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present utility model is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A power control apparatus, the apparatus comprising:

2. The power supply control device according to claim 1, wherein the temperature detection circuit includes:

3. The power control device of claim 2, wherein the analog-to-digital conversion module comprises:

4. The power supply control device according to claim 3, wherein the first voltage following unit includes a first resistor, a second resistor, a third resistor, a fourth resistor, and a first operational amplifier;

5. The power control device of claim 4, wherein the first voltage follower unit further comprises a first capacitor and a second capacitor;

6. The power supply control device according to claim 4, wherein the second voltage following unit includes a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, and a second operational amplifier;

7. The power control device according to claim 6, wherein the second voltage following unit includes a third capacitor and a fourth capacitor;

8. The power supply control device according to any one of claims 3 to 7, wherein the analog-to-digital conversion chip is a CS1239 model chip.

9. The power supply control device according to any one of claims 2 to 7, wherein the temperature detection sensor is attached to a surface of the resistive shunt.

10. A charge-discharge system, the system comprising:

the power supply control device according to any one of claims 1 to 9, wherein a single-chip microcomputer control circuit of the power supply control device is electrically connected to the power supply.