Capacitor series voltage-sharing circuit

Abstract

The utility model discloses a capacitor series connection voltage-sharing circuit, which comprises a plurality of capacitors connected in series and a plurality of resistance value adjustable units, the plurality of resistance value adjustable units correspond to the plurality of capacitors, each resistance value adjustable unit is connected in parallel with the corresponding capacitor, and the equivalent resistance value of each resistance value adjustable unit changes according to the voltage change of the corresponding capacitor. And if the voltage of the capacitor is smaller, the equivalent resistance value of the corresponding resistance value adjustable unit is larger.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of capacitor voltage sharing, and in particular to a capacitor series voltage sharing circuit. BACKGROUND

[0002] In some occasions, such as the bus capacitor of PFC, a large-capacity high-voltage capacitor is needed. A single capacitor often cannot meet the demand, and the common solution is to use two or more than two same low-voltage large-capacity capacitors in series to achieve high-voltage large-capacity.

[0003] However, the difference in individual parameters of capacitors will cause uneven voltage distribution of capacitors in series. For example, the smaller the leakage current of the capacitor, the higher the voltage shared by both ends of the capacitor, and vice versa. When multiple capacitors in series are seriously unevenly distributed, the capacitor will fail due to excessive voltage, and even explode. CONTENT OF THE UTILITY MODEL

[0004] The present application aims to provide a capacitor series voltage sharing circuit that can solve the problem of uneven voltage distribution of traditional series capacitors.

[0005] The present application provides a capacitor series voltage sharing circuit, comprising:

[0006] a plurality of capacitors in series;

[0007] a plurality of resistance adjustable units, the plurality of resistance adjustable units corresponding to the plurality of capacitors, each resistance adjustable unit being in parallel with a corresponding capacitor,

[0008] wherein the equivalent resistance of each resistance adjustable unit changes according to the voltage of the corresponding capacitor, and the smaller the voltage of the capacitor, the greater the equivalent resistance of the corresponding resistance adjustable unit.

[0009] According to some embodiments of the present application, the resistance adjustable unit comprises:

[0010] a plurality of first resistors, the plurality of first resistors corresponding to the plurality of capacitors, each first resistor being in parallel with a corresponding capacitor;

[0011] a plurality of current regulating sub-units, the plurality of current regulating sub-units corresponding to the plurality of capacitors, each current regulating sub-unit being in parallel with a corresponding capacitor,

[0012] wherein the current flowing through each current regulating sub-unit changes according to the voltage of the corresponding capacitor, and the smaller the voltage of the capacitor, the smaller the current flowing through the corresponding current regulating sub-unit.

[0013] According to some embodiments of the present application, the current regulating sub-unit comprises:

[0014] a plurality of second resistors, the plurality of second resistors corresponding to the plurality of capacitors, a first end of each of the plurality of second resistors being connected to a first end of a corresponding one of the plurality of capacitors;

[0015] a plurality of optocouplers, the plurality of optocouplers corresponding to the plurality of capacitors, a receiving positive terminal of each of the plurality of optocouplers being connected to a second end of a corresponding one of the plurality of second resistors, a receiving negative terminal of each of the plurality of optocouplers being connected to a second end of a corresponding one of the plurality of capacitors, and a transmitting positive terminal of each of the plurality of optocouplers being connected to a power supply terminal;

[0016] a negative feedback module, the negative feedback module being connected to the plurality of capacitors and to transmitting negative terminals of the plurality of optocouplers,

[0017] wherein the negative feedback module is configured to average voltages of the plurality of capacitors to obtain an average voltage, to obtain a plurality of error voltages based on the average voltage and the voltages of the plurality of capacitors, the plurality of error voltages corresponding to the plurality of capacitors, and to output the plurality of error voltages to the transmitting negative terminals of the corresponding plurality of optocouplers.

[0018] According to some embodiments of the present application, the negative feedback module comprises:

[0019] an average calculation submodule, the average calculation submodule being connected to the plurality of capacitors, the average calculation submodule being configured to average the voltages of the plurality of capacitors to obtain the average voltage;

[0020] a plurality of error calculation submodules, the plurality of error calculation submodules corresponding to the plurality of capacitors, each of the plurality of error calculation submodules being connected to a corresponding one of the plurality of capacitors, each of the plurality of error calculation submodules being connected to the average calculation submodule, and each of the plurality of error calculation submodules being connected to a transmitting negative terminal of a corresponding one of the plurality of optocouplers, each of the plurality of error calculation submodules being configured to obtain a corresponding one of the error voltages based on the average voltage and a voltage of the corresponding one of the plurality of capacitors, and to output the corresponding one of the error voltages to the transmitting negative terminal of the corresponding one of the plurality of optocouplers.

[0021] According to some embodiments of the present application, the average calculation submodule comprises:

[0022] an operational amplifier summation circuit, the operational amplifier summation circuit being connected to the plurality of capacitors, the operational amplifier summation circuit being configured to sum the voltages of the plurality of capacitors to obtain a summation voltage;

[0023] an operational amplifier amplification circuit, the operational amplifier amplification circuit being connected to the operational amplifier summation circuit and to the plurality of error calculation submodules, the operational amplifier amplification circuit being configured to reduce the summation voltage by a factor of N to obtain the average voltage, and to output the average voltage to the plurality of error calculation submodules, N being a total number of the plurality of capacitors.

[0024] According to some embodiments of the present application, the current regulating subunit comprises:

[0025] a plurality of PTC resistors, each of the PTC resistors being connected in parallel with a corresponding capacitor;

[0026] a negative feedback module connected to the plurality of capacitors;

[0027] a plurality of heating resistors, each of the heating resistors being connected to a first end of a corresponding error calculating subunit, each of the heating resistors being connected to a second end of a corresponding error calculating subunit, and each of the heating resistors being connected to a corresponding capacitor;

[0028] wherein the negative feedback module is configured to average voltages of the plurality of capacitors to obtain an average voltage, obtain a plurality of error voltages according to the average voltage and the voltages of the plurality of capacitors, and output the plurality of error voltages to the first ends of the plurality of heating resistors.

[0029] According to some embodiments of the present application, the negative feedback module comprises:

[0030] an average calculating subunit connected to the plurality of capacitors, the average calculating subunit being configured to average voltages of the plurality of capacitors to obtain the average voltage;

[0031] a plurality of error calculating subunits, each of the error calculating subunits being connected to a corresponding capacitor, each of the error calculating subunits being connected to the average calculating subunit, and each of the error calculating subunits being connected to a first end of a corresponding heating resistor, each of the error calculating subunits being configured to obtain a corresponding error voltage according to the average voltage and a voltage of the corresponding capacitor, and output the corresponding error voltage to the first end of the corresponding heating resistor.

[0032] According to some embodiments of the present application, the average calculating subunit comprises:

[0033] an operational amplifier summation circuit connected to the plurality of capacitors, the operational amplifier summation circuit being configured to sum voltages of the plurality of capacitors to obtain a summation voltage;

[0034] an operational amplifier amplification circuit connected to the operational amplifier summation circuit and connected to the plurality of error calculating subunits, the operational amplifier amplification circuit being configured to reduce the summation voltage by N times to obtain the average voltage, and output the average voltage to the plurality of error calculating subunits, N being a total number of the plurality of capacitors.

[0035] According to some embodiments of the present application, the current regulating subunit comprises:

[0036] a plurality of triodes, the plurality of triodes corresponding to the plurality of capacitors, a collector of each of the triodes being connected to a first end of a corresponding capacitor;

[0037] a plurality of third resistors, the plurality of third resistors corresponding to the plurality of capacitors, a first end of each of the third resistors being connected to an emitter of a corresponding triode, a second end of each of the third resistors being connected to a second end of a corresponding capacitor;

[0038] a negative feedback module, the negative feedback module being connected to the plurality of capacitors;

[0039] a plurality of inverting amplification modules, the plurality of inverting amplification modules corresponding to the plurality of capacitors, an input of each of the inverting amplification modules being connected to the negative feedback module;

[0040] a plurality of operational amplification modules, the plurality of operational amplification modules corresponding to the plurality of capacitors, an output of each of the operational amplification modules being connected to a base of a corresponding triode, a non-inverting input of each of the operational amplification modules being connected to an output of a corresponding inverting amplification module, an inverting input of each of the operational amplification modules being connected to an emitter of a corresponding triode;

[0041] wherein the negative feedback module is configured to average voltages of the plurality of capacitors to obtain an average voltage, obtain a plurality of error voltages according to the average voltage and the voltages of the plurality of capacitors, the plurality of error voltages corresponding to the plurality of capacitors, and output the plurality of error voltages to inputs of the corresponding inverting amplification modules.

[0042] According to some embodiments of the present application, the negative feedback module comprises:

[0043] an average calculation sub-module, the average calculation sub-module being connected to the plurality of capacitors, the average calculation sub-module being configured to average voltages of the plurality of capacitors to obtain the average voltage;

[0044] a plurality of error calculation sub-modules, the plurality of error calculation sub-modules corresponding to the plurality of capacitors, each of the error calculation sub-modules being connected to a corresponding capacitor, each of the error calculation sub-modules being connected to the average calculation sub-module, each of the error calculation sub-modules being connected to an input of a corresponding inverting amplification module, each of the error calculation sub-modules being configured to obtain a corresponding error voltage according to the average voltage and a voltage of a corresponding capacitor, and output the corresponding error voltage to the input of the corresponding inverting amplification module.

[0045] In the embodiment of the present application, high voltage and large capacity are realized by multiple series capacitors, since each of the resistance adjustable units is connected in parallel across the corresponding capacitor, and the equivalent resistance of each of the resistance adjustable units varies according to the voltage of the corresponding capacitor, if the leakage current of the capacitor is larger, the voltage shared by the capacitor is smaller, and the equivalent resistance of the corresponding resistance adjustable unit is larger, so that the voltage shared by the resistance adjustable unit is larger, and the voltage applied to the corresponding capacitor is larger, thereby realizing voltage sharing regulation of multiple capacitors.

[0046] Additional aspects and advantages of the present application will be made apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0047] The present application will be further described below in conjunction with the accompanying drawings and embodiments, in which:

[0048] Figure 1 A schematic diagram of an embodiment of the capacitor series voltage sharing circuit provided by the present application is shown in the figure;

[0049] Figure 2 A schematic diagram of a negative feedback module in an embodiment of the capacitor series voltage sharing circuit provided by the present application is shown in the figure;

[0050] Figure 3 A connection schematic diagram of a PTC resistor in an embodiment of the capacitor series voltage sharing circuit provided by the present application is shown in the figure;

[0051] Figure 4 A connection schematic diagram of a triode in an embodiment of the capacitor series voltage sharing circuit provided by the present application is shown in the figure.

[0052] Reference Signs:

[0053] Error calculation sub-module 100, operational amplifier summing circuit 200, operational amplifier amplification circuit 300, isolation operational amplifier module 400, and inverting amplification module 500. DETAILED DESCRIPTION

[0054] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, in which the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation on the present application.

[0055] In the description of the present application, it should be understood that the orientation description, such as the orientation or position relationship indicated by up, down, etc. is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0056] In the description of the present application, multiple refers to more than two. If there is a description of the first, second, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0057] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installing, connecting, etc. should be broadly understood, and those skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0058] The following refers to Figures 1 to 4 A capacitor series voltage sharing circuit is described according to an embodiment of the present application.

[0059] An embodiment of the present application provides a capacitor series voltage sharing circuit, comprising:

[0060] A plurality of series capacitors;

[0061] A plurality of resistance adjustable units, the plurality of resistance adjustable units corresponding to the plurality of capacitors, each resistance adjustable unit being in parallel with a corresponding capacitor,

[0062] Wherein, the equivalent resistance of each resistance adjustable unit changes according to the voltage of the corresponding capacitor, and the smaller the voltage of the capacitor, the greater the equivalent resistance of the corresponding resistance adjustable unit.

[0063] In the present application, high voltage and large capacity are achieved by a plurality of series capacitors. Since each resistance adjustable unit is connected in parallel across the corresponding capacitor, and the equivalent resistance of each resistance adjustable unit changes according to the voltage of the corresponding capacitor, the greater the leakage current of the capacitor, the smaller the voltage shared by the capacitor, and the greater the equivalent resistance of the corresponding resistance adjustable unit, so that the voltage shared by the resistance adjustable unit is greater, and the voltage applied to the corresponding capacitor is greater, achieving voltage sharing regulation of multiple capacitors.

[0064] In some embodiments of the present application, the specifications of the plurality of capacitors are the same.

[0065] In some embodiments of the present application, the resistance adjustable unit comprises:

[0066] A plurality of first resistors, the plurality of first resistors corresponding to the plurality of capacitors, each first resistor being in parallel with a corresponding capacitor;

[0067] A plurality of current regulating sub-units, the plurality of current regulating sub-units corresponding to the plurality of capacitors, each current regulating sub-unit being in parallel with a corresponding capacitor,

[0068] The current flowing through the current regulating sub-units changes according to the voltage of the corresponding capacitor. The smaller the voltage of the capacitor, the smaller the current flowing through the corresponding current regulating sub-unit.

[0069] In the embodiment, the first resistors are connected in parallel across the plurality of capacitors, and the plurality of first resistors have the same resistance. For each capacitor, if the leakage current is the same, the current flowing through the first resistor is the same, and the voltage across each first resistor is the same. Therefore, the voltage across each capacitor is the same, and the voltage of each capacitor is balanced.

[0070] If the leakage current of a certain capacitor is different, the larger the leakage current of the capacitor, the smaller the current flowing through the corresponding first resistor, the smaller the voltage across the first resistor, and the smaller the voltage shared by the capacitor. Since the current flowing through the corresponding current regulating sub-unit decreases as the voltage of the capacitor decreases, the equivalent resistance of the first resistor and the current regulating sub-unit increases, thereby increasing the voltage shared by the capacitor, and balancing the voltage of each capacitor.

[0071] In some embodiments of the present application, the current regulating sub-unit comprises:

[0072] The plurality of second resistors correspond to the plurality of capacitors, and the first end of each second resistor is connected to the first end of the corresponding capacitor.

[0073] The plurality of optocouplers correspond to the plurality of capacitors, the positive receiving end of each optocoupler is connected to the second end of the corresponding second resistor, the negative receiving end of each optocoupler is connected to the second end of the corresponding capacitor, and the positive transmitting end of each optocoupler is connected to the power supply end.

[0074] The negative feedback module is connected to the plurality of capacitors, and the negative feedback module is connected to the negative transmitting end of the plurality of optocouplers.

[0075] The negative feedback module is used to average the voltages of the plurality of capacitors to obtain an average voltage, and then obtain a plurality of error voltages according to the average voltage and the voltages of the plurality of capacitors. The plurality of error voltages correspond to the plurality of capacitors, and the plurality of error voltages are output to the negative transmitting end of the corresponding optocoupler.

[0076] In this embodiment, the average voltage is obtained by averaging the voltages of multiple capacitors in the negative feedback module. Then, based on the average voltage and the voltages of the multiple capacitors, multiple error voltages are obtained. These error voltages correspond to multiple capacitors and are output to the negative terminal of the corresponding optocoupler's transmitter, causing the optocoupler's transmitter to emit light, thus generating current at the optocoupler's receiver. The smaller the capacitor voltage, the larger the error signal, the smaller the current at the optocoupler's transmitter, and the smaller the current generated at the optocoupler's receiver. Therefore, the equivalent resistance of the optocoupler, the first resistor, and the second resistor is larger, and thus the capacitor voltage becomes correspondingly larger. In other words, the larger the capacitor voltage, the larger the current at the corresponding optocoupler's receiver under the adjustment of the negative feedback module, and the smaller the equivalent resistance of the optocoupler, the first resistor, and the second resistor, thereby reducing the voltage across the capacitor.

[0077] In some embodiments of this application, such as Figure 1 As shown, C1, C2, and C3 are all capacitors, R1, R2, and R3 are all first resistors, R4, R5, and R6 are all second resistors, and U1, U2, and U3 are all optocouplers.

[0078] according to Figure 1 From this, we can deduce that:

[0079] V1=(I0-I 1C )*R 11 ,

[0080] V2=(I0-I 2C )*R 12 ,

[0081] V3=(I0-I 3C )*R 13 ,

[0082] Where V1, V2, and V3 are the voltages of C1, C2, and C3 respectively, and I0 is the total current of the adjustable resistance unit and the capacitor branch. 1C I 2C I 3C The leakage currents of C1, C2, and C3 are respectively, and R is the leakage current of C1, C2, and C3. 11 R 12 R 13 The values ​​of R1, R2, and R3 are respectively.

[0083] According to the above formula, since R 11 R 12 R 13 If they are equal in size, and only R is decreased... 11 R 12 R 13 This causes I0 to increase, when I0 is much greater than I. 1C I 2C I3C Thus, we can get:

[0084] I0-I 1C ≈I0-I 2C ≈I0-I 3C ,

[0085] Therefore, V1, V2 and V3 are approximately equal, realizing voltage equalization of multiple capacitors. However, the more the parallel capacitor branches in the same stage, the greater the leakage current, and the smaller the required R 11 , R 12 , R 13 , and the greater I0, the greater the loss in the circuit.

[0086] In the embodiment, an equivalent resistance is formed by using the optocoupler, the first resistor and the second resistor, i.e. Figure 1 Req1, Req2 and Req3 in the equivalent resistance, we can get:

[0087] V1=(I0-I 1C )*R eq11 ,

[0088] V2=(I0-I 2C )*R eq12 ,

[0089] V3=(I0-I 3C )*R eq13 ,

[0090] wherein R eq11 , R eq12 and R eq13 are the resistance values of Req1, Req2 and Req3 respectively.

[0091] According to the above formula, the size of Req1, Req2 and Req3 can be adjusted by the negative feedback adjustment module to adjust the voltage of the capacitor to realize voltage equalization, without I0 being much greater than I 1C , I 2C , I 3C , which can reduce the loss.

[0092] In some embodiments of the present application, referring to Figure 1 , we can get the following relationship:

[0093] I0=I 1A +I 1B +I 1C =I 2A +I 2B +I 2C =I 3A +I 3B +I 3C ,

[0094] V1=I 1A *R 11 ,

[0095] V2=I 2A *R 12 ,

[0096] V3=I 3A *R 13 ,

[0097]

[0098] It can be derived that:

[0099]

[0100] Wherein, I 1A , I 2A and I 3A are the currents flowing through R1, R2 and R3 respectively, I 1B , I 2B and I 3B are the currents flowing through R4, R5 and R6 respectively, I 1D , I 2D and I 3D are the currents flowing through the emitting ends of U1, U2 and U3 respectively, β is the ratio of the current at the emitting end to the current at the receiving end of U1, U2 and U3, VCC is the voltage of the power supply end, VF is the voltage drop at the emitting end of the optocoupler, R7, R8 and R9 are the current limiting resistance values of the emitting end of the optocoupler, VS1, VS2 and VS3 are the error voltages of C1, C2 and C3 respectively.

[0101] From the above formula, V1 and VS1 are positively correlated, V2 and VS2 are positively correlated, and V3 and VS3 are positively correlated. When the voltage across the capacitor is smaller, the error voltage generated by the negative feedback module is larger, so that the voltage of the capacitor is increased, and the voltage regulation is realized.

[0102] In some embodiments of the present application, as shown in Figure 2 , the negative feedback module comprises:

[0103] a mean value calculation submodule, the mean value calculation submodule being connected to the plurality of capacitors, the mean value calculation submodule being configured to calculate the mean value of the voltages of the plurality of capacitors to obtain a mean voltage;

[0104] a plurality of error calculation sub-modules 100, the plurality of error calculation sub-modules 100 correspond to the plurality of capacitors, each error calculation sub-module 100 is connected to a corresponding capacitor, each error calculation sub-module 100 is connected to the mean value calculation sub-module, each error calculation sub-module 100 is connected to the negative electrode of the transmitting end of a corresponding optocoupler, and each error calculation sub-module 100 is configured to obtain a corresponding error voltage according to the mean voltage and the voltage of the corresponding capacitor, and output the corresponding error voltage to the negative electrode of the transmitting end of the corresponding optocoupler.

[0105] In the embodiment, the mean value calculation sub-module is configured to obtain the mean voltage by averaging the voltages of the plurality of capacitors, and each error calculation sub-module 100 is configured to obtain a corresponding error voltage according to the mean voltage and the voltage of the corresponding capacitor, and output the corresponding error voltage to the negative electrode of the transmitting end of the corresponding optocoupler.

[0106] In some embodiments of the present application, the error calculation sub-module 100 adopts a proportional-integral operation circuit to perform error voltage calculation.

[0107] In some embodiments of the present application, as shown in Figure 2 The mean value calculation sub-module includes:

[0108] an operational amplifier summation circuit 200, the operational amplifier summation circuit 200 is connected to the plurality of capacitors, and the operational amplifier summation circuit 200 is configured to sum the voltages of the plurality of capacitors to obtain a summation voltage;

[0109] an operational amplifier amplification circuit 300, the operational amplifier amplification circuit 300 is connected to the operational amplifier summation circuit 200, the operational amplifier summation circuit 200 is connected to the plurality of error calculation sub-modules 100, and the operational amplifier amplification circuit 300 is configured to reduce the summation voltage by N times to obtain the mean voltage, and output the mean voltage to the plurality of error calculation sub-modules 100, where N is the total number of the plurality of capacitors.

[0110] In the embodiment, the operational amplifier summation circuit 200 is configured to sum the voltages of the plurality of capacitors to obtain the summation voltage, and the operational amplifier amplification circuit 300 is configured to reduce the summation voltage by N times to obtain the mean voltage, and output the mean voltage to the plurality of error calculation sub-modules 100.

[0111] In some embodiments of the present application, the current regulation sub-unit includes:

[0112] a plurality of PTC resistors, the plurality of PTC resistors correspond to the plurality of capacitors, and each PTC resistor is connected in parallel to a corresponding capacitor;

[0113] a negative feedback module, the negative feedback module is connected to the plurality of capacitors;

[0114] a plurality of heating resistors, the plurality of heating resistors correspond to the plurality of capacitors, the negative feedback module is connected to the first ends of the plurality of heating resistors, and the second ends of the plurality of heating resistors are all grounded;

[0115] The negative feedback module is configured to average the voltages of the plurality of capacitors to obtain an average voltage, and obtain a plurality of error voltages according to the average voltage and the voltages of the plurality of capacitors, the plurality of error voltages corresponding to the plurality of capacitors, and output the plurality of error voltages to the first ends of the corresponding heating resistors.

[0116] In the embodiment, the negative feedback module averages the voltages of the plurality of capacitors to obtain an average voltage, and obtains a plurality of error voltages according to the average voltage and the voltages of the plurality of capacitors, the plurality of error voltages corresponding to the plurality of capacitors, and outputs the plurality of error voltages to the first ends of the corresponding heating resistors, so that the heating resistors generate heat, thereby changing the current on the PTC resistor. The smaller the voltage of the capacitor, the greater the error signal, the greater the current of the heating resistor, the greater the heat of the heating resistor, and the smaller the current on the PTC resistor, so the equivalent resistance of the optocoupler, the first resistor and the PTC resistor is greater, and therefore the voltage of the capacitor is correspondingly greater. In other words, the greater the voltage of the capacitor, the smaller the current on the corresponding PTC resistor under the regulation of the negative feedback module, and the smaller the equivalent resistance of the first resistor, the heating resistor and the PTC resistor, thereby reducing the voltage of the capacitor.

[0117] In some embodiments of the present application, the current regulating subunit is as shown in the following figure: Figure 3 In the figure, R1 is the first resistor, R2 is the PTC resistor, and R3 is the heating resistor.

[0118] In some embodiments of the present application, the negative feedback module comprises:

[0119] The average calculation sub-module is connected to the plurality of capacitors, and is configured to average the voltages of the plurality of capacitors to obtain an average voltage.

[0120] The plurality of error calculation sub-modules 100 correspond to the plurality of capacitors, each error calculation sub-module 100 is connected to a corresponding capacitor, each error calculation sub-module 100 is connected to the average calculation sub-module, and each error calculation sub-module 100 is connected to the first end of a corresponding heating resistor. Each error calculation sub-module 100 is configured to obtain a corresponding error voltage according to the average voltage and the voltage of the corresponding capacitor, and output the corresponding error voltage to the first end of the corresponding heating resistor.

[0121] In the embodiment, the average calculation sub-module averages the voltages of the plurality of capacitors to obtain an average voltage, and each error calculation sub-module 100 obtains a corresponding error voltage according to the average voltage and the voltage of the corresponding capacitor, and outputs the corresponding error voltage to the negative electrode of the emitting end of the corresponding optocoupler.

[0122] In some embodiments of the present application, a proportional-integral operation circuit is used to calculate the error voltage.

[0123] In some embodiments of the present application, the mean value calculation sub-module comprises:

[0124] The operational amplifier summation circuit 200 is connected to the plurality of capacitors, and is configured to sum the voltages of the plurality of capacitors to obtain a summation voltage.

[0125] The operational amplifier amplification circuit 300 is connected to the operational amplifier summation circuit 200, which is connected to the plurality of error calculation sub-modules 100. The operational amplifier amplification circuit 300 is configured to reduce the summation voltage by N times to obtain a mean voltage, and output the mean voltage to the plurality of error calculation sub-modules 100. N is the total number of the plurality of capacitors.

[0126] In the present embodiment, the operational amplifier summation circuit 200 is configured to sum the voltages of the plurality of capacitors to obtain a summation voltage. The operational amplifier amplification circuit 300 is configured to reduce the summation voltage by N times to obtain a mean voltage, and output the mean voltage to the plurality of error calculation sub-modules 100.

[0127] In some embodiments of the present application, the current regulation sub-unit comprises:

[0128] The plurality of triodes correspond to the plurality of capacitors. The collector of each triode is connected to the first end of the corresponding capacitor.

[0129] The plurality of third resistors correspond to the plurality of capacitors. The first end of each third resistor is connected to the emitter of the corresponding triode, and the second end of each third resistor is connected to the second end of the corresponding capacitor.

[0130] The negative feedback module is connected to the plurality of capacitors.

[0131] The plurality of inverting amplification modules 500 correspond to the plurality of capacitors. The input end of each inverting amplification module 500 is connected to the negative feedback module.

[0132] The plurality of operational amplification modules correspond to the plurality of capacitors. The output end of each operational amplification module is connected to the base of the corresponding triode. The non-inverting input end of each operational amplification module is connected to the output end of the corresponding inverting amplification module 500. The inverting input end of each operational amplification module is connected to the emitter of the corresponding triode.

[0133] The negative feedback module is configured to obtain a mean voltage by averaging the voltages of the plurality of capacitors. Based on the mean voltage and the voltages of the plurality of capacitors, a plurality of error voltages are obtained. The plurality of error voltages correspond to the plurality of capacitors. The plurality of error voltages are output to the input end of the corresponding inverting amplification module 500.

[0134] In the embodiment, the first resistor, the third resistor and the transistor constitute a voltage-controlled constant current source, the error voltage obtained by the negative feedback module is inverted and amplified by the inverting amplifier module 500, and then input to the base of the transistor through the operational amplifier module, so as to control the current size of the voltage-controlled constant current source. The smaller the voltage of the capacitor, the greater the error voltage, and the smaller the voltage input to the base of the transistor after inversion and amplification, so that the current flowing through the third resistor is smaller, and the equivalent resistance of the first resistor, the third resistor and the transistor is greater, so as to increase the voltage of the capacitor, and realize voltage equalization.

[0135] In some embodiments of the present application, the current adjusting subunit is as shown in the figure, wherein R1 is a first resistor, R2 is a third resistor, Q1 is a transistor, and U1 is an operational amplifier module. The operational amplifier module adopts an operational amplifier. Figure 4

[0136] In some embodiments of the present application, the current adjusting subunit further comprises:

[0137] A plurality of isolation operational amplifier modules 400, the plurality of isolation operational amplifier modules 400 correspond to the plurality of capacitors, each isolation operational amplifier module 400 is connected to the non-inverting input end of the corresponding operational amplifier module, and each isolation operational amplifier module 400 is connected to the output end of the corresponding inverting amplifier module 500. The isolation operational amplifier module 400 can adopt a conventional isolation amplifier, for example, an isolation amplifier with a model number of AMC1311.

[0138] In some embodiments of the present application, the negative feedback module comprises:

[0139] A mean value calculation sub-module, the mean value calculation sub-module is connected to the plurality of capacitors, and the mean value calculation sub-module is used for calculating the mean value of the voltages of the plurality of capacitors to obtain a mean voltage;

[0140] A plurality of error calculation sub-modules 100, the plurality of error calculation sub-modules 100 correspond to the plurality of capacitors, each error calculation sub-module 100 is connected to the corresponding capacitor, each error calculation sub-module 100 is connected to the mean value calculation sub-module, each error calculation sub-module 100 is connected to the input end of the corresponding inverting amplifier module 500, and each error calculation sub-module 100 is used for obtaining a corresponding error voltage according to the mean voltage and the voltage of the corresponding capacitor, and outputting to the input end of the corresponding inverting amplifier module 500.

[0141] In the embodiment, the mean value calculation sub-module calculates the mean value of the voltages of the plurality of capacitors to obtain a mean voltage, and each error calculation sub-module 100 obtains a corresponding error voltage according to the mean voltage and the voltage of the corresponding capacitor, and outputs to the input end of the corresponding inverting amplifier module 500. The inverting amplifier module 500 can adopt a conventional inverting amplifier circuit.

[0142] ​In some embodiments of the present application, the error calculation sub-module 100 adopts a proportional integral operation circuit to calculate the error voltage.

[0143] In some embodiments of the present application, the mean value calculation sub-module comprises:

[0144] The operational amplifier summation circuit 200 is connected with the plurality of capacitors, and is configured to sum the voltages of the plurality of capacitors to obtain a summation voltage.

[0145] The operational amplifier amplification circuit 300 is connected with the operational amplifier summation circuit 200, and the operational amplifier summation circuit 200 is connected with the plurality of error calculation sub-modules 100. The operational amplifier amplification circuit 300 is configured to reduce the summation voltage by N times to obtain a mean voltage, and output the mean voltage to the plurality of error calculation sub-modules 100. N is the total number of the plurality of capacitors.

[0146] In the present embodiment, the operational amplifier summation circuit 200 is configured to sum the voltages of the plurality of capacitors to obtain a summation voltage. The operational amplifier amplification circuit 300 is configured to reduce the summation voltage by N times to obtain a mean voltage, and output the mean voltage to the plurality of error calculation sub-modules 100.

[0147] The embodiments of the present application are described in detail above with reference to the accompanying drawings, but the present application is not limited to the above-described embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the purpose of the present application.

Claims

1. A capacitor series voltage equalization circuit, characterized by, The application relates to a voltage stabilizing circuit. The application relates to a voltage stabilizing circuit. The application relates to a voltage stabilizing circuit. The application relates to a voltage stabilizing circuit.

2. The capacitive series voltage sharing circuit of claim 1, wherein, The application relates to a voltage stabilizing circuit. The application relates to a voltage stabilizing circuit. The application relates to a voltage stabilizing circuit. The application relates to a voltage stabilizing circuit.

3. The capacitive series voltage sharing circuit of claim 2, wherein, The application relates to a voltage stabilizing circuit. The application relates to a voltage stabilizing circuit. The application relates to a voltage stabilizing circuit. The application relates to a voltage stabilizing circuit. The application relates to a voltage stabilizing circuit.

4. The capacitive series voltage sharing circuit of claim 3, wherein, The application relates to a voltage stabilizing circuit. The application relates to a voltage stabilizing circuit. The application relates to a voltage stabilizing circuit.

5. The capacitive series voltage sharing circuit of claim 4, wherein, The application relates to a voltage stabilizing circuit. The application relates to a voltage stabilizing circuit. The application relates to a voltage stabilizing circuit. The application relates to a voltage stabilizing circuit. The application relates to a voltage stabilizing circuit. The application relates to a voltage stabilizing circuit. The application relates to a voltage stabilizing circuit. The application relates to a voltage stabilizing circuit. The application relates to a voltage stabilizing circuit. The application relates to a voltage stabilizing circuit. The application relates to a voltage stabilizing circuit. The application relates to a voltage stabilizing circuit. The application relates to a voltage stabilizing circuit. The application relates to a voltage stabilizing circuit. The application relates to a voltage stabilizing circuit. The application relates to a voltage stabilizing circuit. 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The application relates to a voltage stabilizing circuit. The application relates to a voltage stabilizing circuit. The application relates to a voltage stabilizing An operational amplifier (op-amp) amplification circuit is connected to the op-amp summation circuit, the op-amp summation circuit is connected to a plurality of error calculation sub-modules, the op-amp amplification circuit is used to reduce the sum voltage by N times to obtain the mean voltage, and the mean voltage is output to a plurality of error calculation sub-modules, and N is the total number of the plurality of capacitors.

6. The capacitive series voltage sharing circuit of claim 2, wherein, The current regulation subunit comprises: A plurality of PTC resistors corresponding to the plurality of capacitors, each PTC resistor being connected in parallel with a corresponding capacitor; A negative feedback module connected to the plurality of capacitors; A plurality of heating resistors corresponding to the plurality of capacitors, the negative feedback module being connected to first ends of the plurality of heating resistors, and second ends of the plurality of heating resistors being grounded; The negative feedback module is used to average the voltages of the plurality of capacitors to obtain a mean voltage, and then obtain a plurality of error voltages according to the mean voltage and the voltages of the plurality of capacitors, the plurality of error voltages corresponding to the plurality of capacitors, and output the plurality of error voltages to first ends of the corresponding heating resistors.

7. The capacitive series voltage sharing circuit of claim 6, wherein, The negative feedback module comprises: A mean calculation sub-module connected to the plurality of capacitors, the mean calculation sub-module being used to average the voltages of the plurality of capacitors to obtain the mean voltage; A plurality of error calculation sub-modules corresponding to the plurality of capacitors, each error calculation sub-module being connected to a corresponding capacitor, each error calculation sub-module being connected to the mean calculation sub-module, and each error calculation sub-module being connected to a first end of a corresponding heating resistor, each error calculation sub-module being used to obtain a corresponding error voltage according to the mean voltage and the voltage of the corresponding capacitor, and output the corresponding error voltage to the first end of the corresponding heating resistor.

8. The capacitive series voltage sharing circuit of claim 7, wherein, The mean calculation sub-module comprises: An op-amp summation circuit connected to the plurality of capacitors, the op-amp summation circuit being used to sum the voltages of the plurality of capacitors to obtain a sum voltage; An op-amp amplification circuit connected to the op-amp summation circuit, the op-amp summation circuit being connected to a plurality of error calculation sub-modules, the op-amp amplification circuit being used to reduce the sum voltage by N times to obtain the mean voltage, and output the mean voltage to a plurality of error calculation sub-modules, and N being the total number of the plurality of capacitors.

9. The capacitive series voltage sharing circuit of claim 2, wherein, The current regulation subunit comprises: A plurality of triodes corresponding to the plurality of capacitors, a collector of each triode being connected to a first end of a corresponding capacitor; A plurality of third resistors corresponding to the plurality of capacitors, a first end of each third resistor being connected to an emitter of a corresponding triode, and a second end of each third resistor being connected to a second end of a corresponding capacitor; A negative feedback module connected to the plurality of capacitors; A plurality of inverting amplification modules, the plurality of inverting amplification modules correspond to a plurality of capacitors, and input ends of the plurality of inverting amplification modules are connected to the negative feedback module; A plurality of operational amplification modules, the plurality of operational amplification modules correspond to the plurality of capacitors, an output end of each of the plurality of operational amplification modules is connected to a base of a corresponding triode, a non-inverting input end of each of the plurality of operational amplification modules is connected to an output end of a corresponding inverting amplification module, and an inverting input end of each of the plurality of operational amplification modules is connected to an emitter of a corresponding triode. The negative feedback module is configured to obtain a mean voltage by averaging voltages of the plurality of capacitors, obtain a plurality of error voltages according to the mean voltage and the voltages of the plurality of capacitors, the plurality of error voltages correspond to the plurality of capacitors, and output the plurality of error voltages to input ends of the plurality of inverting amplification modules.

10. The capacitive series voltage sharing circuit of claim 9, wherein, The negative feedback module comprises: A mean calculation submodule connected to the plurality of capacitors, the mean calculation submodule is configured to obtain the mean voltage by averaging the voltages of the plurality of capacitors; A plurality of error calculation submodules, the plurality of error calculation submodules correspond to the plurality of capacitors, each of the plurality of error calculation submodules is connected to a corresponding capacitor, each of the plurality of error calculation submodules is connected to the mean calculation submodule, and each of the plurality of error calculation submodules is connected to an input end of a corresponding inverting amplification module, each of the plurality of error calculation submodules is configured to obtain a corresponding error voltage according to the mean voltage and a voltage of a corresponding capacitor, and output the corresponding error voltage to the input end of the corresponding inverting amplification module.

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