Half-bus voltage balance control circuit and electronic equipment

Abstract

The invention relates to a half-bus voltage balance control circuit and electronic equipment. The half-bus voltage balance control circuit comprises a voltage sampling module, a comparison module, a driving module and a balance power module, the voltage sampling module is used for sampling the positive and negative bus voltages to obtain a half-bus voltage signal; the comparison module compares the voltage value of the half-bus voltage signal with a reference voltage and outputs a first control signal and a second control signal; the driving module generates a first driving signal according to the first control signal and controls the balance power module to be started through the first driving signal; or generating a second driving signal according to the second control to control the balance power module to be closed; controlling the balance power module to balance voltage according to the driving signal source. According to the invention, self-balancing of bus voltage can be realized by adopting a hardware circuit of the comparison module, the stability and reliability of the system are ensured, a chip is not required to participate in regulation and control, the complexity of a software system is prevented from being increased, and meanwhile, the problem of chip hardware resource pressure does not exist.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage converters, and more specifically, to a half-bus voltage balancing control circuit and electronic equipment. Background Art

[0002] In the field of energy storage converters, the neutral point clamped three-level circuit (NPC) is a commonly used topology. As customers' demand for unbalanced loads increases, traditional converter designs need to add balancing circuits. Among them, balancing circuits are divided into two categories, namely active and passive. The most common active balancing circuits are Figure 1 As shown in the figure, when the half bus is unbalanced, Q1 or Q2 is turned on, and R3 or R4 discharges the half bus to balance the voltage. The power balanced by this method is very small, the application range is relatively narrow, and the energy will be converted into heat and dissipated, affecting the overall efficiency. The passive balancing circuit adjusts the half bus voltage by adding an additional bridge arm. This method requires the core chip to participate in the control, which will inevitably make the software system more complicated. In addition, since at least two driver ports need to be added, the pressure on the hardware resources of the core chip will also increase. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a half-bus voltage balancing control circuit and an electronic device in view of the problems existing in the prior art.

[0004] The technical solution adopted by the present invention to solve the technical problem is: constructing a half-bus voltage balancing control circuit, including: a voltage sampling module, a comparison module, a driving module and a balancing power module;

[0005] The input end of the comparison module is connected to the output end of the voltage sampling module, the output end of the comparison module is connected to the input end of the driving module, and the output end of the driving module is connected to the balancing power module;

[0006] The voltage sampling module is used to sample the positive bus voltage and the negative bus voltage to obtain a half bus voltage signal, and send the half bus voltage signal to the comparison module;

[0007] The comparison module is used to compare the voltage value of the half-bus voltage signal with a reference voltage, and output a first control signal and a second control signal according to the comparison result; the first control signal is used to control the balancing power module to turn on, and the second control signal is used to control the balancing power module to turn off;

[0008] The driving module is used to generate a first driving signal according to the first control signal to control the balanced power module to turn on through the first driving signal; or, the driving module is used to generate a second driving signal according to the second control to control the balanced power module to turn off through the second driving signal; or, the driving module is used to control the balanced voltage of the balanced power module according to the driving signal source.

[0009] In the half-bus voltage balancing control circuit of the present invention, the voltage sampling module comprises: a positive bus voltage sampling circuit, a negative bus voltage sampling circuit and a half-bus voltage comparison circuit;

[0010] The positive bus voltage sampling circuit is connected to the positive bus and is used to collect the voltage of the positive bus to obtain a positive bus voltage sampling signal;

[0011] The negative bus voltage sampling circuit is connected to the negative bus and is used to collect the voltage of the negative bus to obtain a negative bus voltage sampling signal;

[0012] The half-bus voltage comparison circuit is connected to the positive bus voltage sampling circuit and the negative bus voltage sampling circuit respectively, and is used to perform comparison operations based on the positive bus voltage sampling signal and the negative bus voltage sampling signal to obtain the half-bus voltage.

[0013] In the half-bus voltage balancing control circuit described in the present invention, the positive bus voltage sampling circuit is composed of a resistor voltage divider network; the negative bus voltage sampling circuit is composed of a resistor voltage divider network; and the half-bus voltage comparison circuit is composed of a comparator or an operational amplifier.

[0014] In the half-bus voltage balancing control circuit of the present invention, the reference voltage includes: a first reference voltage and a second reference voltage;

[0015] The comparison module includes: a first comparison circuit, a second comparison circuit and a first logic circuit;

[0016] A first input end of the first comparison circuit is connected to the first reference voltage, a second input end of the first comparison circuit and a first input end of the second comparison circuit are connected to an output end of the voltage sampling module, a second end of the second comparison circuit is connected to the first reference voltage, an output end of the first comparison circuit is connected to a first input end of the first logic circuit, an output end of the second comparison circuit is connected to a second input end of the first logic circuit, and an output end of the first logic circuit is connected to the driving module.

[0017] In the half-bus voltage balancing control circuit described in the present invention, the first comparison circuit is composed of an operational amplifier or a comparator; the second comparison circuit is composed of an operational amplifier or a comparator; the first logic circuit includes any one of an AND gate, an inverter and a push-pull circuit.

[0018] In the half-bus voltage balancing control circuit of the present invention, the driving module includes: a second logic circuit and a third logic circuit;

[0019] The first input end of the second logic circuit is connected to the output end of the comparison module, the output end of the second logic circuit is connected to the first input end of the third logic circuit, and the output end of the third logic circuit is connected to the balancing power module.

[0020] In the half-bus voltage balancing control circuit described in the present invention, the second logic circuit includes: any one of an AND gate, an inverter and a push-pull circuit; the third logic circuit includes: any one of an AND gate, an inverter and a push-pull circuit.

[0021] The half-bus voltage balancing control circuit of the present invention further includes: a peak limiting module;

[0022] The peak limiting module is connected to the driving module, and is used for sampling the current of the balancing power module to obtain a current sampling signal, and generating an overcurrent trigger signal based on the current sampling signal.

[0023] The half-bus voltage balance control circuit of the present invention further includes: a voltage control signal source;

[0024] The voltage-controlled signal source is connected to the voltage sampling module and the driving module respectively, and is used to generate the driving signal source to the driving module according to the half-bus voltage signal, so as to control the balanced power module.

[0025] The present invention also provides an electronic device, comprising: the above-mentioned half-bus voltage balancing control circuit.

[0026] The half-bus voltage balancing control circuit and electronic device implementing the present invention have the following beneficial effects: including: a voltage sampling module, a comparison module, a driving module and a balancing power module; the voltage sampling module samples and processes the positive and negative bus voltages to obtain a half-bus voltage signal; the comparison module compares the voltage value of the half-bus voltage signal with the reference voltage, and outputs a first control signal and a second control signal; the driving module generates a first driving signal according to the first control signal, and controls the balancing power module to turn on through the first driving signal; or, generates a second driving signal according to the second control to control the balancing power module to turn off; and controls the balancing power module to balance the voltage according to the driving signal source. The hardware circuit of the comparison module used in the present invention can realize the self-balancing of the bus voltage, ensure the stability and reliability of the system, do not need the chip to participate in the regulation and control, avoid increasing the complexity of the software system, and do not have the problem of chip hardware resource pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0028] Figure 1 It is a circuit schematic diagram of an existing half-bus voltage balancing circuit;

[0029] Figure 2 It is a principle block diagram of a half-bus voltage balancing control circuit provided by the present invention;

[0030] Figure 3 It is a circuit diagram of a half-bus voltage balancing control circuit provided by the present invention. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] refer to Figure 2 , Figure 2 The principle block diagram of the half-bus voltage balancing control circuit provided by the present invention. The half-bus voltage balancing control circuit can be applied to all circuit topologies that require half-bus balancing. The present invention achieves a high power balancing capability in a pure hardware manner.

[0033] Specifically, Figure 2As shown, the half-bus voltage balance control circuit includes: a voltage sampling module 10, a comparison module 20, a drive module 30 and a balance power module 40. The input end of the comparison module 20 is connected to the output end of the voltage sampling module 10, the output end of the comparison module 20 is connected to the input end of the drive module 30, and the output end of the drive module 30 is connected to the balance power module 40.

[0034] In the embodiment of the present invention, the voltage sampling module 10 is used to sample the positive bus voltage and the negative bus voltage to obtain a half bus voltage signal, and send the half bus voltage signal to the comparison module 20 .

[0035] Optionally, the voltage sampling module 10 includes: a positive bus voltage sampling circuit, a negative bus voltage sampling circuit and a half bus voltage comparison circuit; the positive bus voltage sampling circuit is connected to the positive bus, and is used to collect the voltage of the positive bus to obtain a positive bus voltage sampling signal; the negative bus voltage sampling circuit is connected to the negative bus, and is used to collect the voltage of the negative bus to obtain a negative bus voltage sampling signal; the half bus voltage comparison circuit is respectively connected to the positive bus voltage sampling circuit and the negative bus voltage sampling circuit, and is used to perform comparison operations based on the positive bus voltage sampling signal and the negative bus voltage sampling signal to obtain the half bus voltage.

[0036] Among them, the positive bus voltage sampling circuit is composed of a resistor voltage divider network; the negative bus voltage sampling circuit is composed of a resistor voltage divider network; and the half bus voltage comparison circuit is composed of a comparator or an operational amplifier. That is, in the embodiment of the present invention, the positive and negative bus voltage sampling circuits can be implemented by, but not limited to, a resistor voltage divider network, and the half bus voltage comparison circuit can be implemented by, but not limited to, an operational amplifier or a comparator.

[0037] In an embodiment of the present invention, the comparison module 20 is used to compare the voltage value of the half-bus voltage signal with the reference voltage, and output a first control signal and a second control signal according to the comparison result. The first control signal is used to control the balance power module 40 to turn on, and the second control signal is used to control the balance power module 40 to turn off. The reference voltage includes: a first reference voltage and a second reference voltage. Optionally, in an embodiment of the present invention, the comparison module 20 includes: a first comparison circuit, a second comparison circuit and a first logic circuit;

[0038] The first input end of the first comparison circuit is connected to the first reference voltage, the second input end of the first comparison circuit and the first input end of the second comparison circuit are connected to the output end of the voltage sampling module 10, the second end of the second comparison circuit is connected to the first reference voltage, the output end of the first comparison circuit is connected to the first input end of the first logic circuit, the output end of the second comparison circuit is connected to the second input end of the first logic circuit, and the output end of the first logic circuit is connected to the driving module 30. The first comparison circuit is composed of an operational amplifier or a comparator; the second comparison circuit is composed of an operational amplifier or a comparator; the first logic circuit includes any one of an AND gate, an inverter and a push-pull circuit. That is, in the embodiment of the present invention, the first comparison circuit and the second comparison circuit can be implemented by, but not limited to, an operational amplifier or a comparator, and the first logic circuit can be implemented by, but not limited to, an AND gate, an inverter, and a push-pull circuit.

[0039] In an embodiment of the present invention, the driving module 30 is used to generate a first driving signal according to a first control signal, so as to control the balancing power module 40 to turn on through the first driving signal; or, the driving module 30 is used to generate a second driving signal according to a second control, so as to control the balancing power module 40 to turn off through the second driving signal; or, the driving module 30 is used to control the balancing voltage of the balancing power module 40 according to the driving signal source. Optionally, the driving module 30 includes: a second logic circuit and a third logic circuit; the first input end of the second logic circuit is connected to the output end of the comparison module 20, the output end of the second logic circuit is connected to the first input end of the third logic circuit, and the output end of the third logic circuit is connected to the balancing power module 40. Among them, the second logic circuit includes: any one of an AND gate, an inverter and a push-pull circuit; the third logic circuit includes: any one of an AND gate, an inverter and a push-pull circuit. That is, the second logic circuit and the third logic circuit can both use but are not limited to an AND gate, an inverter or a push-pull circuit.

[0040] The present invention realizes the balance of the half bus voltage through the comparison module 20, that is, the balancing power module 40 is turned on or off through voltage comparison.

[0041] Furthermore, if Figure 2As shown, the half-bus voltage balancing control circuit also includes: a peak limiting module 50; the peak limiting module 50 is connected to the driving module 30, and is used to sample the current of the balancing power module 40 to obtain a current sampling signal, and generate an overcurrent trigger signal based on the current sampling signal. Optionally, the peak limiting module 50 can be implemented by, but not limited to, a current sensor, an operational amplifier, a comparator, and a trigger. In a preferred embodiment, the peak limiting module 50 includes: a current sampling circuit, a third comparison circuit, and a trigger. Among them, the input end of the third comparison circuit is connected to the current sampling circuit, the output end of the third comparison circuit is connected to the input end of the trigger, and the trigger is respectively connected to the second input end of the second logic circuit and the second input end of the third logic circuit. Optionally, the third comparison circuit can be implemented by, but not limited to, a comparator or an operational amplifier.

[0042] The peak limiting module 50 samples and monitors the current of the balancing power module 40 , so that when the current of the balancing power module 40 is too large, the balancing power module 40 can be triggered to be shut down.

[0043] Furthermore, if Figure 2 As shown, the half-bus voltage balance control circuit also includes: a voltage-controlled signal source 60; the voltage-controlled signal source 60 is connected to the voltage sampling module 10 and the driving module 30 respectively, and is used to generate a driving signal source to the driving module 30 according to the half-bus voltage signal to control the balanced power module 40. Among them, the driving signal source is a driving control signal (such as a PWM signal) with different duty cycles, and its duty cycle is adjusted with the half-bus voltage signal. Through the driving signal source and in conjunction with the driving module 30, the voltage, current, opening, and closing logic control of the balanced power module 40 can be achieved.

[0044] In an embodiment of the present invention, the balanced power module 40 can adopt an existing solution, for example, it may include a driving chip and a push-pull circuit, a half-bridge power circuit, an inductor, etc. The balanced power module 40 is used to turn on different power tubes according to the comparison result of the comparison module 20, the comparison result of the peak limiting module 50 and the drive of the voltage-controlled signal source 60, thereby balancing the bus voltage.

[0045] In a preferred embodiment, if Figure 3 As shown, in this embodiment, the first comparison circuit includes: a first comparator U1B; the second comparison circuit includes: a second comparator U1C; the first logic circuit includes: a first AND gate U2A; the second logic circuit includes: a second AND gate U2B; the third logic circuit includes: a third AND gate U2C; the third comparison circuit includes: a third comparator U3A. The half-bus voltage signal is the voltage difference between the positive bus voltage and the negative bus voltage.

[0046] like Figure 3As shown, the negative input terminal of the first comparator U1B is connected to the first reference voltage through the first potentiometer R2, the positive input terminal of the first comparator U1B and the negative input terminal of the second comparator U1C are connected to the output terminal of the voltage sampling module 10 to access the half-bus voltage signal, and the positive input terminal of the second comparator U1C is connected to the second reference voltage through the second potentiometer R7. Specifically, when the voltage value of the half-bus voltage signal is greater than the first reference voltage, the first comparator U1B outputs a high level, and the second comparator U1C outputs a high level. At this time, the first AND gate U2A outputs a high level, the second AND gate U2B outputs a high level, and the third AND gate U2C also outputs a high level, so that the balanced power module 40 is turned on. Among them, the first potentiometer R2 can adjust the voltage difference value for turning on the balanced power module 40 according to the requirements of different systems for the bus. When the voltage value of the half-bus voltage signal is greater than the second reference voltage, the first comparator U1B outputs a high level, and the second comparator U1C outputs a low level. At this time, the first AND gate U2A outputs a low level, and the second AND gate U2B and the third AND gate U2C both output a low level, and the balanced power module 40 is turned off. At this time, the system also synchronously detects the abnormal state, and then controls the balanced power module 40 to no longer adjust the bus voltage. The system also outputs an abnormal alarm, thereby shutting down to protect the system safety. Among them, when the voltage value of the half-bus voltage signal is greater than the first reference voltage and less than the second reference voltage, the first comparator U1B and the second comparator U1C both output a high level. At this time, the bus voltage difference meets the working requirements, and the subsequent circuit works normally.

[0047] like Figure 3 As shown, the current sampling circuit samples the current signal of the inductor through the sensor, and then transmits it to the negative input terminal of the third comparator U3A, and compares it with the current limit value I_limit through the third comparator U3A. The output terminal of the third comparator U3A is connected to the zero pin of the trigger, and the clock signal is connected to the second input terminal of the second AND gate U2B. When the circuit of the balanced power module 40 works normally, the sampled current value is less than I_limit. At this time, the output terminal of the third comparator U3A outputs a high level, and the output of the trigger remains high, and does not affect the output; when the circuit current of the balanced power module 40 is too large, the sampled current value is greater than I_limit. At this time, the output terminal of the third comparator U3A outputs a low level, and the output of the trigger is forced to output a low level, thereby turning off the balanced power module 40. Since the trigger is triggered by the rising edge, the balanced power module 40 will only be turned on when a new drive switching cycle comes. Therefore, the balanced power module 40 will not be triggered repeatedly, ensuring the stability and reliability of the system. As shown Figure 3As shown, the output of the trigger is connected to the second AND gate U2B, the output signal of the trigger is ANDed with the output signal of the first AND gate U2A, and the output signal of the trigger is in the upper position by default. When the voltage value of the half-bus voltage signal meets the working conditions, that is, when the first AND gate U2A outputs a high level, the inductor current is small (that is, no overcurrent occurs), the trigger outputs a high level, the second AND gate U2B outputs a high level, and the subsequent circuit works normally. When the inductor current is too large, the trigger outputs a low level, the second AND gate U2B outputs a low level, and the subsequent circuit is locked and does not work.

[0048] like Figure 3 As shown, the voltage-controlled signal source 60 generates a driving signal source with different duty cycles according to the half-bus voltage signal output by the half-bus voltage comparison circuit. Among them, when the voltage difference value of the half-bus voltage signal is small, the duty cycle is low, and when the voltage difference value of the half-bus voltage signal is large, the duty cycle is high. The driving signal source is used to control the subsequent balanced power module 40, and it cooperates with the third AND gate U2C to realize the logic control of the voltage, current, opening and closing of the balanced power module 40. Specifically, when the bus voltage difference meets the working requirements and the inductor current does not exceed the limit value, the second AND gate U2B outputs a high level. At this time, the driving signal source can normally output the third AND gate U2C, thereby controlling the power tube in the balanced power module 40 to act to achieve a balanced voltage; otherwise, the second AND gate U2B outputs a low level, and the driving signal source cannot drive and control the subsequent stage through the third AND gate U2C.

[0049] The core of the present invention is to balance the half bus voltage by comparison, turn on the balancing power module 40 by voltage comparison, and limit the maximum current by current comparison. The main principle is that when the bus voltage is high, the corresponding power tube is turned on to release the bus voltage, wherein the power tube opening time is determined by the voltage difference of the bus voltage, and the maximum working current is limited by current monitoring, thereby ensuring the safety and reliability of the system.

[0050] The present invention uses comparators, triggers, etc. to build hardware circuits to achieve self-balancing of the bus voltage. When the bus voltage difference is higher than the set point, the balancing circuit (i.e., the balancing power module 40) is turned on, and the working state of the balancing circuit is adjusted by the bus voltage difference. In this way, closed-loop voltage regulation ensures the stability of the system. In addition, in order to prevent overcurrent problems that may occur during voltage regulation, the present invention applies current as feedback to the control, and turns off the balancing circuit when overcurrent occurs. Due to the action of the trigger, it is ensured that the balancing circuit can only work again in a new switching cycle, and the balancing circuit will not be frequently started and stopped.

[0051] The present invention further provides an electronic device, wherein the electronic device comprises: the half-bus voltage balancing control circuit disclosed in the embodiment of the present invention. Optionally, the electronic device may be an energy storage converter.

[0052] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0053] Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in the above description according to function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0054] The steps of the method or algorithm described in conjunction with the embodiments disclosed herein may be implemented directly using hardware, a software module executed by a processor, or a combination of the two. The software module may be placed in a random access memory (RAM), a memory, a read-only memory (ROM), an electrically programmable ROM, an electrically erasable programmable ROM, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

[0055] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot limit the scope of protection of the present invention. All equivalent changes and modifications made to the scope of the claims of the present invention should fall within the scope of the claims of the present invention.

Claims

1. A half-bus voltage balancing control circuit, characterized in that: include: Voltage sampling module, comparison module, drive module and balanced power module; The input end of the comparison module is connected to the output end of the voltage sampling module, the output end of the comparison module is connected to the input end of the driving module, and the output end of the driving module is connected to the balancing power module; The voltage sampling module is used to sample the positive bus voltage and the negative bus voltage to obtain a half bus voltage signal, and send the half bus voltage signal to the comparison module; The comparison module is used to compare the voltage value of the half-bus voltage signal with a reference voltage, and output a first control signal and a second control signal according to the comparison result; the first control signal is used to control the balancing power module to turn on, and the second control signal is used to control the balancing power module to turn off; The driving module is used to generate a first driving signal according to the first control signal to control the balanced power module to turn on through the first driving signal; or, the driving module is used to generate a second driving signal according to the second control to control the balanced power module to turn off through the second driving signal; or, the driving module is used to control the balanced voltage of the balanced power module according to the driving signal source.

2. The half-bus voltage balancing control circuit according to claim 1, characterized in that: The voltage sampling module includes: a positive bus voltage sampling circuit, a negative bus voltage sampling circuit and a half bus voltage comparison circuit; The positive bus voltage sampling circuit is connected to the positive bus and is used to collect the voltage of the positive bus to obtain a positive bus voltage sampling signal; The negative bus voltage sampling circuit is connected to the negative bus and is used to collect the voltage of the negative bus to obtain a negative bus voltage sampling signal; The half-bus voltage comparison circuit is connected to the positive bus voltage sampling circuit and the negative bus voltage sampling circuit respectively, and is used to perform comparison operations based on the positive bus voltage sampling signal and the negative bus voltage sampling signal to obtain the half-bus voltage.

3. The half-bus voltage balancing control circuit according to claim 2, characterized in that: The positive bus voltage sampling circuit is composed of a resistor voltage divider network; the negative bus voltage sampling circuit is composed of a resistor voltage divider network; and the half bus voltage comparison circuit is composed of a comparator or an operational amplifier.

4. The half-bus voltage balancing control circuit according to claim 1, characterized in that: The reference voltage includes: a first reference voltage and a second reference voltage; The comparison module includes: a first comparison circuit, a second comparison circuit and a first logic circuit; A first input end of the first comparison circuit is connected to the first reference voltage, a second input end of the first comparison circuit and a first input end of the second comparison circuit are connected to an output end of the voltage sampling module, a second end of the second comparison circuit is connected to the first reference voltage, an output end of the first comparison circuit is connected to a first input end of the first logic circuit, an output end of the second comparison circuit is connected to a second input end of the first logic circuit, and an output end of the first logic circuit is connected to the driving module.

5. The half-bus voltage balancing control circuit according to claim 4, characterized in that: The first comparison circuit is composed of an operational amplifier or a comparator; the second comparison circuit is composed of an operational amplifier or a comparator; the first logic circuit includes any one of an AND gate, an inverter and a push-pull circuit.

6. The half-bus voltage balancing control circuit according to claim 1, characterized in that: The driving module includes: a second logic circuit and a third logic circuit; The first input end of the second logic circuit is connected to the output end of the comparison module, the output end of the second logic circuit is connected to the first input end of the third logic circuit, and the output end of the third logic circuit is connected to the balancing power module.

7. The half-bus voltage balancing control circuit according to claim 6, characterized in that: The second logic circuit includes: any one of an AND gate, an inverter and a push-pull circuit; the third logic circuit includes: any one of an AND gate, an inverter and a push-pull circuit.

8. The half-bus voltage balancing control circuit according to claim 1, characterized in that: Also includes: Peak limit module; The peak limiting module is connected to the driving module, and is used for sampling the current of the balanced power module to obtain a current sampling signal, and generating an overcurrent trigger signal based on the current sampling signal.

9. The half-bus voltage balancing control circuit according to claim 1, characterized in that: Also includes: Voltage controlled signal source; The voltage-controlled signal source is connected to the voltage sampling module and the driving module respectively, and is used to generate the driving signal source to the driving module according to the half-bus voltage signal, so as to control the balanced power module.

10. An electronic device, characterized in that: include: A half-bus voltage balancing control circuit as described in any one of claims 1 to 9.

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