Bus capacitor voltage regulation circuit, voltage regulation method and electronic equipment

Abstract

The invention discloses a bus capacitor voltage regulation circuit, a voltage regulation method and electronic equipment, and relates to the technical field of circuits, the circuit comprises a flyback auxiliary power supply circuit and a voltage regulation load circuit, and the flyback auxiliary power supply circuit is connected with a first capacitor and a second capacitor; the flyback auxiliary power supply circuit is used for responding to the control signal and adjusting the output power according to the voltage of the first capacitor and the voltage of the second capacitor; wherein the control signal is a duty ratio empty signal generated after the control chip is triggered under the condition that the voltage difference between the first capacitor and the second capacitor is greater than a preset threshold value; and the voltage regulating load circuit is connected with the flyback auxiliary power supply circuit and is used for consuming the output power of the flyback auxiliary power supply circuit so as to regulate the voltage of the first capacitor or the voltage of the second capacitor. The problem of voltage imbalance caused by series connection of high-voltage bus capacitors can be solved.

Description

Technical Field

[0001] The present application relates to the field of circuit technology, and in particular to a bus capacitor voltage regulation circuit, a voltage regulation method and an electronic device. Background Art

[0002] In three-phase variable frequency drive systems, three-phase uncontrolled rectifier topologies or three-phase PFC (Power Factor Correction) rectifier topologies are commonly used. The bus voltage obtained after rectification is generally above 540V, while the withstand voltage of commonly used electrolytic capacitors does not exceed 450V. Therefore, the bus capacitors in the three-phase system need to be connected in series to increase the withstand voltage. However, since the positive and negative bus capacitors cannot be completely consistent, the voltages of the upper and lower bus capacitors will be uneven in actual use.

[0003] In the prior art, two methods are usually used to adjust the voltage of the upper and lower bus capacitors. One method is to adjust the duty cycle of the two capacitors through a software algorithm to make up for the voltage difference between the two capacitors between the upper and lower buses, but this method will increase the complexity of the algorithm and affect the total harmonic distortion rate of the current; the other method is to connect a voltage-equalizing resistor in parallel to the capacitor, but this method has the defects of difficult resistor matching and limited adjustment ability. Therefore, how to obtain a bus capacitor voltage regulation circuit with a larger voltage difference adjustment range and no impact on the total harmonic distortion rate of the current has become a problem that needs to be solved urgently. Summary of the invention

[0004] In view of the above-mentioned defects or deficiencies in the related art, the purpose of the present application is to provide a bus capacitor voltage regulation circuit, a voltage regulation method and an electronic device, which can solve the voltage imbalance problem caused by the series connection of high-voltage bus capacitors.

[0005] To achieve the above objectives, this application provides the following solutions: In a first aspect, the present application provides a bus capacitor voltage regulation circuit method, wherein the bus capacitor includes a first capacitor and a second capacitor connected in series between a positive bus and a negative bus, and the bus capacitor voltage regulation circuit includes: a flyback auxiliary power supply circuit, connected to the first capacitor and the second capacitor respectively, and used to respond to a control signal and adjust the output power according to the voltage of the first capacitor and the voltage of the second capacitor; the control signal is a duty cycle signal generated after the control chip is triggered when the voltage difference between the first capacitor and the second capacitor is greater than a preset threshold; A voltage regulating load circuit is connected to the flyback auxiliary power supply circuit and is used to consume the output power of the flyback auxiliary power supply circuit to regulate the voltage of the first capacitor or the voltage of the second capacitor.

[0006] Optionally, the flyback auxiliary power supply circuit includes: a first auxiliary loop, a second auxiliary loop and a flyback transformer; the input end of the first auxiliary loop is connected to the first capacitor, and the output end of the first auxiliary loop is connected to the first primary winding of the flyback transformer; the input end of the second auxiliary loop is connected to the second capacitor, and the output end of the second auxiliary loop is connected to the second primary winding of the flyback transformer; the secondary winding of the flyback transformer is connected to the voltage regulating load circuit; wherein, when the voltage difference between the first capacitor and the second capacitor is greater than a preset threshold, the flyback transformer generates induced electromotive forces of different values ​​according to the voltage of the first capacitor or the voltage of the second capacitor to adjust the output power of the flyback transformer.

[0007] Optionally, the first auxiliary circuit includes a first MOS tube; the first end of the first primary winding of the flyback transformer is connected to one end of the first capacitor, and the tail end of the first primary winding of the flyback transformer is connected to the drain of the first MOS tube; the source of the first MOS tube is connected to the other end of the first capacitor; wherein the first MOS tube is used to respond to the control signal to turn on or off the first auxiliary circuit.

[0008] Optionally, the first auxiliary circuit also includes a first diode for preventing the induced current generated by the flyback transformer from flowing in reverse; the first end of the first primary winding of the flyback transformer is connected to one end of the first capacitor through the first diode; wherein the anode of the first diode is connected to one end of the first capacitor, the cathode of the first diode is connected to the first end of the first primary winding of the flyback transformer, and the tail end of the first primary winding of the flyback transformer is connected to the drain of the first MOS tube; the source of the first MOS tube is connected to the other end of the first capacitor.

[0009] Optionally, the second auxiliary circuit includes a second MOS tube; the head end of the second primary winding of the flyback transformer is connected to one end of the second capacitor, and the tail end of the second primary winding of the flyback transformer is connected to the drain of the second MOS tube; the source of the second MOS tube is connected to the other end of the second capacitor; wherein the second MOS tube is used to respond to the control signal to turn on or off the second auxiliary circuit; the second MOS tube and the first MOS tube are turned on or off at the same time.

[0010] Optionally, the second auxiliary circuit also includes a second diode for preventing the induced current generated by the flyback transformer from flowing in reverse; the first end of the second primary winding of the flyback transformer is connected to one end of the second capacitor through the second diode; wherein the anode of the second diode is connected to one end of the second capacitor, the cathode of the second diode is connected to the first end of the second primary winding of the flyback transformer, and the tail end of the second primary winding of the flyback transformer is connected to the drain of the second MOS tube; the source of the second MOS tube is connected to the other end of the second capacitor.

[0011] Optionally, the voltage regulating load circuit includes: a third diode and a power-consuming component; the anode of the third diode is connected to the head end of the secondary winding of the flyback transformer, the cathode of the third diode is connected to the positive electrode of the power-consuming component, and the negative electrode of the power-consuming component is connected to the tail end of the secondary winding of the flyback transformer; wherein the power consumption of the power-consuming component is proportional to the output power of the flyback transformer.

[0012] In a second aspect, the present application provides a bus capacitor voltage regulation method, which is applied to a bus capacitor voltage regulation circuit as described in any one of the above items, wherein the bus capacitor includes a first capacitor and a second capacitor connected in series between a positive bus and a negative bus, and the bus capacitor voltage regulation method includes: In response to a control signal, the output power is adjusted according to the voltage of the first capacitor and the voltage of the second capacitor; the control signal is a duty cycle signal generated after the control chip is triggered when the voltage difference between the first capacitor and the second capacitor is greater than a preset threshold; The power consumption of the power-consuming component is adjusted based on the output power to adjust the voltage of the first capacitor or the voltage of the second capacitor.

[0013] Optionally, the response control signal adjusts the output power according to the voltage of the first capacitor and the voltage of the second capacitor, including: responding to the control signal, simultaneously turning on or off the first auxiliary circuit and the second auxiliary circuit, and generating induced electromotive forces of different values ​​according to the voltage of the first capacitor and the voltage of the second capacitor to adjust the output power of the flyback transformer; the adjustment of the power consumption of the power-consuming component based on the output power to adjust the voltage of the first capacitor or the voltage of the second capacitor includes: adjusting the power consumption of the power-consuming component based on the output power of the flyback transformer to adjust the voltage of the first capacitor or the voltage of the second capacitor.

[0014] In a third aspect, the present application provides an electronic device, wherein the electronic device comprises the bus capacitor voltage regulating circuit described in any one of the above.

[0015] The present application provides a bus capacitor voltage regulation circuit, a voltage regulation method and an electronic device, wherein the bus capacitor voltage regulation circuit includes a flyback auxiliary power supply circuit and a voltage regulation load circuit, wherein the flyback auxiliary power supply circuit is connected to a first capacitor and a second capacitor respectively, and the voltage regulation load circuit is connected to the flyback auxiliary power supply circuit; wherein, when the voltage difference between the first capacitor and the second capacitor is greater than a preset threshold value, the control chip is triggered to send a control signal to the flyback auxiliary power supply circuit, and the flyback auxiliary power supply circuit responds to the control signal and adjusts the output power according to the voltage of the first capacitor and the voltage of the second capacitor; the voltage regulation load circuit consumes the output power of the flyback auxiliary power supply circuit, thereby realizing The voltage of the first capacitor and the voltage of the second capacitor are now adjusted so that the voltage of the first capacitor is almost equal to the voltage of the second capacitor, thereby improving the voltage balancing capability of the positive and negative busbars. Compared with the prior art, the busbar capacitor voltage regulating circuit can actively regulate the capacitor voltages above and below the busbar within a wider voltage range, thereby solving the voltage imbalance problem caused by the series connection of high-voltage busbar capacitors. The busbar capacitor voltage regulating circuit solves the voltage imbalance problem caused by the series connection of high-voltage busbar capacitors without increasing the voltage balancing resistor, adopting a complex algorithm, or affecting the total harmonic distortion rate of the current, thereby effectively improving the reliability and efficiency of adjusting the busbar capacitor voltage. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 A bus capacitor voltage regulating circuit provided in one embodiment of the present application; Figure 2 A schematic diagram of a busbar capacitor voltage regulation circuit provided in an embodiment of the present application Figure 1 ; Figure 3 A schematic diagram of a busbar capacitor voltage regulation circuit provided in an embodiment of the present application Figure 2 ; Figure 4 A schematic diagram of a busbar capacitor voltage regulation circuit provided in an embodiment of the present application Figure 3 ; Figure 5 A flow chart of a bus capacitor voltage regulation method provided in one embodiment of the present application; Figure 6 A schematic diagram of the structure of an electronic device provided in one embodiment of the present application.

[0018] Description of reference numerals: 10. Positive bus; 20. Negative bus; 30. Bus capacitor voltage regulation circuit; 301. Flyback auxiliary power supply circuit; 3011. First auxiliary circuit; 3012. Second auxiliary circuit; 302. Voltage regulation load circuit; 40. Three-phase six-switch tube power factor correction circuit. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0020] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0021] In an exemplary embodiment, a bus capacitor voltage regulating circuit is provided, such as Figure 1 As shown, the bus capacitor voltage regulating circuit 30 includes: a flyback auxiliary power supply circuit 301 and a voltage regulating load circuit 302 .

[0022] Among them, the three-phase six-switch power factor correction (PFC) circuit 40 is connected to the positive and negative busbars, and the first capacitor C1 and the second capacitor C2 are connected in series between the positive busbar 10 and the negative busbar 20; the three-phase six-switch power factor correction (PFC) circuit 40 converts the three-phase AC power into high-voltage DC power and forms a high-voltage DC busbar through the first capacitor C1 and the second capacitor C2; the flyback auxiliary power supply circuit 301 is connected to the first capacitor C1 and the second capacitor C2 respectively, and the flyback auxiliary power supply circuit 301 is used to respond to the control signal and adjust the output power according to the voltage of the first capacitor C1 and the voltage of the second capacitor C2; the control signal is a duty cycle signal generated after the control chip is triggered when the voltage difference between the first capacitor C1 and the second capacitor C2 is greater than the preset threshold. The voltage regulating load circuit 302 is connected to the flyback auxiliary power supply circuit 301; the voltage regulating load circuit 302 is used to consume the output power of the flyback auxiliary power supply circuit 301 to adjust the voltage of the first capacitor C1 or the voltage of the second capacitor C2.

[0023] It should be noted that the control chip involved in the embodiments of the present application can be a microcontroller unit (MCU) responsible for monitoring the voltage of the first capacitor C1 and the voltage of the second capacitor C2; it can also be an industrial control chip responsible for monitoring the voltage of the first capacitor C1 and the voltage of the second capacitor C2, and the industrial control chip integrates control algorithms, data storage, input and output interfaces and other functions.

[0024] And the three-phase six-switch power factor correction (PFC) circuit 40 of the embodiment of the present application includes Figure 1 and Figure 2 The three-phase six-switch tube power factor correction (PFC) circuit 40 shown is used to convert three-phase alternating current into high-voltage direct current, and form a high-voltage direct current bus through two upper and lower series-connected first capacitors C1 and second capacitors C2, which provide the necessary basis for the subsequent solution of the voltage imbalance of the positive and negative buses. At the same time, combined with the bus capacitor voltage regulation circuit 30, it can reduce harmonic distortion and improve the reliability and efficiency of the entire bus capacitor voltage regulation circuit 30.

[0025] In the bus capacitor voltage regulating circuit 30 of the embodiment of the present application, when the voltage difference between the first capacitor C1 and the second capacitor C2 is greater than a preset threshold, the control chip is triggered to send a control signal to the flyback auxiliary power supply circuit 301, and the flyback auxiliary power supply circuit 301 responds to the control signal and adjusts the output power according to the voltage of the first capacitor C1 and the voltage of the second capacitor C2; the voltage regulating load circuit 302 consumes the output power of the flyback auxiliary power supply circuit 301 to adjust the voltage of the first capacitor C1 or the voltage of the second capacitor C2; compared with the prior art, the bus capacitor voltage regulating circuit 30 can actively adjust the capacitor voltages above and below the bus within a wider voltage range, solving the voltage imbalance problem caused by the series connection of high-voltage bus capacitors; and the bus capacitor voltage regulating circuit 30 solves the voltage imbalance problem caused by the series connection of high-voltage bus capacitors without increasing the voltage equalizing resistor, without using complex algorithms, and without affecting the total harmonic distortion rate of the current, and can effectively improve the reliability and efficiency of adjusting the bus capacitor voltage.

[0026] In a specific embodiment, Figure 3 As shown, Figure 1 Taking the three-phase six-switch power factor correction (PFC) circuit 40 shown as an example, the above-mentioned flyback auxiliary power supply circuit 301 includes a first auxiliary circuit 3011, a second auxiliary circuit 3012 and a flyback transformer T1; wherein, the input end of the first auxiliary circuit 3011 is connected to the first capacitor C1, and the output end of the first auxiliary circuit 3011 is connected to the first primary winding of the flyback transformer T1; the input end of the second auxiliary circuit 3012 is connected to the second capacitor C2, and the output end of the second auxiliary circuit 3012 is connected to the second primary winding of the flyback transformer T1; the secondary winding of the flyback transformer T1 is connected to the voltage regulating load circuit 302; Among them, when the voltage difference between the first capacitor C1 and the second capacitor C2 is greater than the preset threshold, the flyback transformer T1 generates induced electromotive forces of different values ​​according to the voltage of the first capacitor C1 or the voltage of the second capacitor C2 to adjust the output power of the flyback transformer T1. It can be understood that when the positive and negative bus voltages are detected to be unbalanced, due to the voltage clamping effect of the transformer, the primary winding corresponding to the bus on the side with higher voltage will output more power, causing the capacitor voltage corresponding to the bus on that side to drop, thereby achieving passive voltage balancing.

[0027] It should be noted that the preset thresholds in the embodiments of the present application have different values ​​according to different usage scenarios, which are mainly based on the actual application scenarios and are not specifically limited in the embodiments of the present application.

[0028] Furthermore, if Figure 3 or Figure 4 As shown, the first auxiliary loop 3011 includes a first MOS transistor S1. The first primary winding head end of the flyback transformer T1 is connected to one end of the first capacitor C1, and the tail end of the first primary winding of the flyback transformer T1 is connected to the drain of the first MOS transistor S1; the source of the first MOS transistor S1 is connected to the other end of the first capacitor C1; wherein the first MOS transistor S1 is used to respond to the control signal to turn on or off the first auxiliary loop 3011.

[0029] Furthermore, the first auxiliary circuit 3011 also includes a first diode D1; the first end of the first primary winding of the flyback transformer T1 is connected to one end of the first capacitor C1 through the first diode D1, wherein the anode of the first diode D1 is connected to one end of the first capacitor C1, and the cathode of the first diode D1 is connected to the first end of the first primary winding of the flyback transformer T1. The tail end of the first primary winding of the flyback transformer T1 is connected to the drain of the first MOS tube S1; the source of the first MOS tube S1 is connected to the other end of the first capacitor C1; wherein the first diode D1 is used to prevent the induced current generated by the flyback transformer T1 from flowing in reverse.

[0030] Furthermore, if Figure 3 or Figure 4 As shown, the second auxiliary circuit 3012 includes a second MOS transistor S2; the first end of the second primary winding of the flyback transformer T1 is connected to one end of the second capacitor C2, and the tail end of the second primary winding of the flyback transformer T1 is connected to the drain of the second MOS transistor S2; the source of the second MOS transistor S2 is connected to the other end of the second capacitor C2; wherein the second MOS transistor S2 is used to respond to the control signal to turn on or off the second auxiliary circuit 3012; the second MOS transistor S2 and the first MOS transistor S1 are turned on or off at the same time.

[0031] Furthermore, the second auxiliary loop 3012 also includes a second diode D2; the first end of the second primary winding of the flyback transformer is connected to one end of the second capacitor C2 through the second diode D2, wherein the anode of the second diode D2 is connected to one end of the second capacitor C2, and the cathode of the second diode D2 is connected to the first end of the second primary winding of the flyback transformer T1. The tail end of the second primary winding of the flyback transformer T1 is connected to the drain of the second MOS tube S2; the source of the second MOS tube S2 is connected to the other end of the second capacitor C2; wherein the second diode D2 is used to prevent the induced current generated by the flyback transformer T1 from flowing in reverse.

[0032] As can be understood from the above embodiments, the control chip monitors the voltage of the first capacitor C1 and the voltage of the second capacitor C2. When there is a voltage difference between the voltage of the first capacitor C1 and the voltage of the second capacitor C2, the control chip simultaneously sends a duty cycle signal to the first MOS tube S1 and the second MOS tube S2 to turn on the first MOS tube S1 and the second MOS tube S2. The flyback transformer T1 stores the electric energy of the first capacitor C1 through the first primary winding and stores the electric energy of the second capacitor C2 through the second primary winding. Due to the voltage clamping effect of the flyback transformer T1, the primary winding corresponding to the capacitor with a higher voltage will output more power. The flyback transformer T1 transfers more electric energy from the capacitor on the high-voltage side to the voltage regulating load circuit 302, thereby reducing the capacitor voltage on the high-voltage side, thereby achieving the purpose of balancing the positive and negative bus voltages.

[0033] Furthermore, if Figure 3 or Figure 4 As shown, the voltage regulating load circuit 302 includes: a third diode and a power-consuming component; the anode of the third diode is connected to the head end of the secondary winding of the flyback transformer T1, the cathode of the third diode is connected to the positive electrode of the power-consuming component, and the negative electrode of the power-consuming component is connected to the tail end of the secondary winding of the flyback transformer T1; wherein the power consumption of the power-consuming component is proportional to the output power of the flyback transformer T1.

[0034] In combination with actual application scenarios, the above-mentioned power-consuming component can be a fan with adjustable speed, and the above-mentioned voltage-regulating load circuit 302 is specifically: the anode of the third diode is connected to the beginning of the secondary winding of the flyback transformer T1, the cathode of the third diode is connected to the positive pole of the fan, and the negative pole of the fan is connected to the tail end of the secondary winding of the flyback transformer T1; wherein, the speed of the fan is adjustable and the speed of the fan is proportional to the output power of the flyback transformer T1.

[0035] It can be further understood in combination with the above embodiments that the flyback transformer T1 has two primary windings and one secondary winding, one primary winding of the flyback transformer T1 is connected to the positive bus 10 capacitor, that is, the first capacitor C1, and the other primary winding is connected to the negative bus 20 capacitor, that is, the second capacitor C2; during the period when the first MOS tube S1 and the second MOS tube S2 are simultaneously turned on and off, the flyback transformer T1 stores and releases electric energy, and outputs the capacitor voltage on the high-voltage side to the voltage regulating load circuit 302. The power of the power-consuming components of the voltage regulating load circuit 302 is adjustable. By adjusting the power consumption of the power-consuming components, the output power of the flyback transformer T1 is consumed, so that the flyback transformer T1 always maintains a wider adjustment range. Such a design can actively adjust the capacitor voltages above and below the bus within a wider voltage range, without increasing the voltage balancing resistor, without using complex algorithms, and without affecting the total harmonic distortion rate of the current, and can effectively improve the reliability and efficiency of adjusting the bus capacitor voltage.

[0036] It should be noted that, in other embodiments, Figure 4 As shown, four capacitors can be set between the positive and negative bus bars, wherein the first capacitor C1 and the third capacitor are connected in parallel, the second capacitor C2 and the fourth capacitor are connected in parallel, and the first capacitor C1 and the second capacitor C2 are connected in series. The bus capacitor voltage regulating circuit 30 provided in the embodiment of the present application is used to balance the voltage on the positive and negative bus bars, which can further reflect that the bus capacitor voltage regulating circuit 30 provided in the embodiment of the present application can actively adjust the capacitor voltages on the upper and lower bus bars within a wider voltage range, so that the voltage difference between the capacitors on the upper and lower bus bars is almost zero.

[0037] And in other embodiments, in order to further improve the bus capacitor voltage regulation circuit 30's regulation capability for the voltage on the positive and negative bus, the secondary winding of the flyback transformer T1 can be set to multiple, and the load component in the voltage regulation load circuit 302 can be a power-adjustable fan or a power-adjustable load, such as a water cooling system. And in this embodiment, for example, when the load component is a fan, the speed of the fan can be regulated and controlled by the control chip according to the voltage difference between the first capacitor C1 and the second capacitor C2.

[0038] On the other hand, an embodiment of the present application provides a bus capacitor voltage regulation method, which is applied to the bus capacitor voltage regulation circuit 30 provided in the above embodiment. Figure 5 FIG. 2 is a flow chart of a busbar capacitor voltage regulation method according to an embodiment of the present application. Figure 5 As shown, the method includes: Step S510, responding to a control signal, adjusting the output power according to the voltage of the first capacitor C1 and the voltage of the second capacitor C2; the control signal is a duty cycle signal generated after the control chip is triggered when the voltage difference between the first capacitor C1 and the second capacitor C2 is greater than a preset threshold.

[0039] Step S520 , adjusting the power consumption of the power-consuming component based on the output power to adjust the voltage of the first capacitor C1 or the voltage of the second capacitor C2 .

[0040] As an optional implementation, the above-mentioned response control signal adjusts the output power according to the voltage of the first capacitor C1 and the voltage of the second capacitor C2, including: responding to the control signal, simultaneously turning on or off the first auxiliary circuit 3011 and the second auxiliary circuit 3012, and generating induced electromotive forces of different values ​​according to the voltage of the first capacitor C1 and the voltage of the second capacitor C2, so as to adjust the output power of the flyback transformer T1; the above-mentioned adjustment of the power consumption of the power-consuming component based on the output power to adjust the voltage of the first capacitor C1 or the voltage of the second capacitor C2, including: adjusting the power consumption of the power-consuming component based on the output power of the flyback transformer T1 to adjust the voltage of the first capacitor C1 or the voltage of the second capacitor C2.

[0041] Among them, when this implementation method is implemented, when the voltage difference between the first capacitor C1 and the second capacitor C2 is greater than the preset threshold, the control chip is triggered to send a control signal to the flyback auxiliary power supply circuit 301, and the flyback auxiliary power supply circuit 301 responds to the control signal and adjusts the output power according to the voltage of the first capacitor C1 and the voltage of the second capacitor C2; the voltage regulating load circuit 302 consumes the output power of the flyback auxiliary power supply circuit 301 to adjust the voltage of the first capacitor C1 or the voltage of the second capacitor C2; compared with the prior art, the bus capacitor voltage regulating circuit 30 can actively adjust the capacitor voltages above and below the bus within a wider voltage range, solving the voltage imbalance problem caused by the series connection of high-voltage bus capacitors; and the bus capacitor voltage regulating circuit 30 solves the voltage imbalance problem caused by the series connection of high-voltage bus capacitors without increasing the voltage equalizing resistor, without using complex algorithms, and without affecting the total harmonic distortion rate of the current, and can effectively improve the reliability and efficiency of adjusting the bus capacitor voltage.

[0042] It should be noted that a bus capacitor voltage regulation method provided in an embodiment of the present application is implemented based on the above-mentioned bus capacitor voltage regulation circuit 30, belongs to the same inventive concept, and is similar to the working principle of the above-mentioned bus capacitor voltage regulation circuit 30. Therefore, the specific limitations of the bus capacitor voltage regulation method provided in an embodiment of the present application can refer to the specific limitations of the bus capacitor voltage regulation circuit 30 in one or more embodiments above, and will not be repeated here.

[0043] On the other hand, an embodiment of the present application provides an electronic device, including the bus capacitor voltage regulating circuit 30 provided in the above embodiment, Figure 6 The figure is a schematic diagram of the process of the electronic device of the embodiment of the present application. Figure 6As shown, the electronic device includes a bus capacitor voltage regulating circuit 30, and the bus capacitor voltage regulating circuit 30 is the bus capacitor voltage regulating circuit 30 described in the above embodiment.

[0044] It should be noted that the bus capacitor voltage regulating circuit 30 has been described in detail in the above embodiment. Please refer to the above embodiment for specific details, which will not be repeated here.

[0045] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0046] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and core ideas of this application. At the same time, for those skilled in the art, according to the ideas of this application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting this application.

Claims

1. A busbar capacitor voltage regulating circuit, characterized in that: The bus capacitor includes a first capacitor and a second capacitor connected in series between the positive bus and the negative bus, and the bus capacitor voltage regulating circuit includes: a flyback auxiliary power supply circuit, connected to the first capacitor and the second capacitor respectively, and used to respond to a control signal and adjust the output power according to the voltage of the first capacitor and the voltage of the second capacitor; the control signal is a duty cycle signal generated after the control chip is triggered when the voltage difference between the first capacitor and the second capacitor is greater than a preset threshold; A voltage regulating load circuit is connected to the flyback auxiliary power supply circuit and is used to consume the output power of the flyback auxiliary power supply circuit to regulate the voltage of the first capacitor or the voltage of the second capacitor.

2. The busbar capacitor voltage regulating circuit according to claim 1, characterized in that: The flyback auxiliary power supply circuit comprises: a first auxiliary circuit, a second auxiliary circuit and a flyback transformer; The input end of the first auxiliary loop is connected to the first capacitor, and the output end of the first auxiliary loop is connected to the first primary winding of the flyback transformer; the input end of the second auxiliary loop is connected to the second capacitor, and the output end of the second auxiliary loop is connected to the second primary winding of the flyback transformer; the secondary winding of the flyback transformer is connected to the voltage regulating load circuit; Among them, when the voltage difference between the first capacitor and the second capacitor is greater than a preset threshold, the flyback transformer generates induced electromotive forces of different values ​​according to the voltage of the first capacitor or the voltage of the second capacitor to adjust the output power of the flyback transformer.

3. The busbar capacitor voltage regulating circuit according to claim 2, characterized in that: The first auxiliary circuit includes a first MOS tube; The first end of the first primary winding of the flyback transformer is connected to one end of the first capacitor, and the tail end of the first primary winding of the flyback transformer is connected to the drain of the first MOS transistor; the source of the first MOS transistor is connected to the other end of the first capacitor; The first MOS transistor is used to respond to the control signal to turn on or off the first auxiliary loop.

4. The busbar capacitor voltage regulating circuit according to claim 3, characterized in that: The first auxiliary loop further includes a first diode for preventing the induced current generated by the flyback transformer from flowing in reverse; the first end of the first primary winding of the flyback transformer is connected to one end of the first capacitor through the first diode; Among them, the anode of the first diode is connected to one end of the first capacitor, the cathode of the first diode is connected to the beginning of the first primary winding of the flyback transformer, the tail end of the first primary winding of the flyback transformer is connected to the drain of the first MOS tube; the source of the first MOS tube is connected to the other end of the first capacitor.

5. The busbar capacitor voltage regulating circuit according to claim 3, characterized in that: The second auxiliary circuit includes a second MOS tube; The first end of the second primary winding of the flyback transformer is connected to one end of the second capacitor, and the tail end of the second primary winding of the flyback transformer is connected to the drain of the second MOS transistor; the source of the second MOS transistor is connected to the other end of the second capacitor; The second MOS transistor is used to respond to the control signal to turn on or off the second auxiliary loop; the second MOS transistor and the first MOS transistor are turned on or off at the same time.

6. The busbar capacitor voltage regulating circuit according to claim 5, characterized in that: The second auxiliary loop also includes a second diode for preventing the induced current generated by the flyback transformer from flowing in reverse; the first end of the second primary winding of the flyback transformer is connected to one end of the second capacitor through the second diode; Among them, the anode of the second diode is connected to one end of the second capacitor, the cathode of the second diode is connected to the head end of the second primary winding of the flyback transformer, the tail end of the second primary winding of the flyback transformer is connected to the drain of the second MOS tube; the source of the second MOS tube is connected to the other end of the second capacitor.

7. The busbar capacitor voltage regulating circuit according to claim 2, characterized in that: The voltage regulating load circuit comprises: a third diode and a power consumption component; The anode of the third diode is connected to the head end of the secondary winding of the flyback transformer, the cathode of the third diode is connected to the positive electrode of the power-consuming component, and the negative electrode of the power-consuming component is connected to the tail end of the secondary winding of the flyback transformer; The power consumption of the power-consuming component is proportional to the output power of the flyback transformer.

8. A busbar capacitor voltage regulation method, characterized in that: Applied to the bus capacitor voltage regulating circuit according to any one of claims 1 to 7, the bus capacitor includes a first capacitor and a second capacitor connected in series between a positive bus and a negative bus, and the bus capacitor voltage regulating method includes: In response to a control signal, the output power is adjusted according to the voltage of the first capacitor and the voltage of the second capacitor; the control signal is a duty cycle signal generated after the control chip is triggered when the voltage difference between the first capacitor and the second capacitor is greater than a preset threshold; The power consumption of the power-consuming component is adjusted based on the output power to adjust the voltage of the first capacitor or the voltage of the second capacitor.

9. The busbar capacitor voltage regulation method according to claim 8, characterized in that: The responding control signal adjusts the output power according to the voltage of the first capacitor and the voltage of the second capacitor, including: In response to the control signal, the first auxiliary circuit and the second auxiliary circuit are turned on or off at the same time, and induced electromotive forces of different values ​​are generated according to the voltage of the first capacitor and the voltage of the second capacitor to adjust the output power of the flyback transformer; The adjusting the power consumption of the power-consuming component based on the output power to adjust the voltage of the first capacitor or the voltage of the second capacitor includes: The power consumption of the power-consuming component is adjusted based on the output power of the flyback transformer to adjust the voltage of the first capacitor or the voltage of the second capacitor.

10. An electronic device, characterized in that: The electronic device comprises the bus capacitor voltage regulating circuit as described in any one of claims 1 to 7.

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