Compensation device for motor drive circuit

Abstract

The invention provides a compensation device of a motor driving circuit, which belongs to the technical field of motor control and comprises a peak voltage elimination circuit connected between a positive power line and a negative power line of the motor driving circuit. In the peak voltage elimination circuit, a first end of a low-pass filtering module, a first end of a high-pass filtering module and a first end of a negative peak voltage discharge module are connected to a positive power line, and a second end of the low-pass filtering module and a second end of the high-pass filtering module are connected to a negative power line. The third end of the low-pass filtering module is connected with the third end of the high-pass filtering module; the energy consumption resistor (RW1) and a first resistor (RL1) in the low-pass filtering module are connected in series between the positive power line and the negative power line, the interconnection end of the energy consumption resistor (RW1) and the first resistor (RL1) is connected with the second end of the negative peak voltage discharging module, and the resistance value of the energy consumption resistor (RW1) is not smaller than a first resistance threshold value.

Description

Technical Field

[0001] The invention belongs to the technical field of motor control, and in particular relates to a compensation device for a motor drive circuit. Background Art

[0002] The motor drive currently used in vehicles is mainly based on the pulse width modulation (PWM) drive mode. The PWM drive mode transmits a set of PWM carriers to the motor input end and drives the motor to rotate by controlling the duty cycle of the carrier. However, during the driving process, a series of spike voltages may be superimposed on the PWM carrier due to external factors. These spike voltage pulses can cause serious failures and damage to the motor.

[0003] In the related art, a low-pass filter circuit is used to filter out spike voltages, and a high-power resistor connected in parallel to the power supply bus of the motor is used to consume the spike voltages generated by the circuit. However, the high-power resistor has a small resistance value, which results in a large volume, and the energy consumption of the high-power resistor runs through the entire power supply cycle, with a long energy consumption time and a large energy consumption. In addition, the parameters of the low-pass filter circuit are difficult to match, and the amount of spike voltage pulses filtered out is low. Summary of the invention

[0004] In order to solve the above technical problems, the first aspect of the present invention proposes a compensation device for a motor drive circuit, the compensation device includes a peak voltage elimination circuit connected between a positive power line and a negative power line of the motor drive circuit, the peak voltage elimination circuit includes an energy-consuming resistor (RW1), a low-pass filter module, a high-pass filter module and a negative peak voltage discharge module, the low-pass filter module and the high-pass filter module each include at least one resistor and at least one capacitor; wherein,

[0005] The first end of the low-pass filter module, the first end of the high-pass filter module, and the first end of the negative peak voltage discharge module are connected to the positive power line, the second end of the low-pass filter module and the second end of the high-pass filter module are connected to the negative power line, and the third end of the low-pass filter module is connected to the third end of the high-pass filter module;

[0006] The energy dissipation resistor (RW1) and the first resistor (RL1) in the low-pass filter module are connected in series between the positive power line and the negative power line, and the interconnected end of the energy dissipation resistor (RW1) and the first resistor (RL1) is connected to the second end of the negative peak voltage discharge module, and the resistance value of the energy dissipation resistor (RW1) is not less than a first resistance value threshold.

[0007] As described in the compensation device of the present invention, the low-pass filtering module includes a second-order low-pass filter.

[0008] As described in the compensation device of the present invention, the second-order low-pass filter comprises the first resistor (RL1), the second resistor (RL2), the first capacitor (CL1), and the second capacitor (CL2); wherein,

[0009] A first end of the first resistor (RL1) is connected to the positive power line, and a second end of the first resistor (RL1) is connected to a first end of the energy dissipation resistor (RW1), a first end of the second resistor (RL2), a first end of the first capacitor (CL1), and a second end of the negative peak voltage discharge module;

[0010] The second end of the second resistor (RL2) and the first end of the second capacitor (CL2) are connected to the third end of the high-pass filter module, and the second end of the first capacitor (CL1) and the second end of the second capacitor (CL2) are connected to the negative power line.

[0011] As described in the compensation device of the present invention, the high-pass filtering module includes a T-shaped high-pass filter.

[0012] According to the compensation device of the present invention, the T-shaped high-pass filter comprises a third resistor (RL3), a third capacitor (CH1) and a fourth capacitor (CH2); wherein,

[0013] A first end of the third capacitor (CH1) is connected to the positive power line, a second end of the third capacitor (CH1) is connected to a first end of the fourth capacitor (CH2) and a first end of the third resistor (RL3), a second end of the fourth capacitor (CH2) is connected to a third end of the low-pass filter module, and a second end of the third resistor (RL3) is connected to the negative power line.

[0014] According to the compensation device of the present invention, the negative peak voltage discharge module comprises a first diode (D1) and a second diode (D2); wherein:

[0015] The anode of the first diode (D1) and the cathode of the second diode (D2) are connected to the positive power line, and the cathode of the first diode (D1) and the anode of the second diode (D2) are connected to the interconnection end of the energy dissipation resistor (RW1) and the first resistor (RL1).

[0016] As described in the compensation device of the present invention, the resistance value range of the resistors in the low-pass filter module and the high-pass filter module is: 20-150Ω; the first resistance threshold is 1KΩ.

[0017] As described in the compensation device of the present invention, the resistance value range of the resistors in the low-pass filter module and the high-pass filter module is 50-80Ω; and the first resistance threshold is 10KΩ.

[0018] As described in the compensation device of the present invention, the resistors in the low-pass filtering module and the high-pass filtering module are composed of a plurality of sub-resistors connected in parallel, and the resistance values ​​of the plurality of sub-resistors are the same.

[0019] In the compensation device of the present invention, the capacitance value of the capacitor in the low-pass filter module is ≥3uF; and the capacitance value of the capacitor in the high-pass filter module is ≤0.5uF.

[0020] As described in the compensation device of the present invention, the capacitance value range of the capacitor in the low-pass filter module is: 10uF ~ 16uF; the capacitance value of the capacitor in the high-pass filter module is ≤0.1uF.

[0021] As described in the compensation device of the present invention, the capacitor in the low-pass filtering module is composed of a plurality of sub-capacitors connected in parallel, and the capacitance values ​​of the plurality of sub-capacitors are the same or different.

[0022] As described in the compensation device of the present invention, the motor drive circuit is a multi-phase bridge drive circuit, the midpoint of each bridge arm is connected to a terminal of any one of the drive coils of the motor, and the other ends of the three drive coils are interconnected; the high potential end of each bridge arm is connected to the positive power line, and the low potential end of each bridge arm is connected to the negative power line.

[0023] As described in the compensation device of the present invention, the motor drive circuit does not have a high-power low-resistance resistor connected across the positive power line and the negative power line.

[0024] The compensation device for the motor drive circuit designed by the present invention connects an energy-consuming resistor (RW1) and a first resistor (RL1) in a low-pass filter module in series between a positive power line and a negative power line. Since the resistance value of the energy-consuming resistor (RW1) is not less than the first resistance value threshold, this resistor series circuit is generally equivalent to a high-resistance consumption load resistor. This resistor series circuit can overcome the technical problems of large volume and high energy consumption caused by the use of small-resistance high-power resistors in the related art; secondly, by adding a high-pass filter module and a negative spike voltage discharge module on the basis of the low-pass filter module, the technical problems of difficult parameter matching and low filtering amount of spike voltage pulses caused by only using a low-pass filter module in the related art can be overcome. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 The present invention is a circuit diagram of a motor drive including a large-power energy-consuming resistor;

[0026] Figure 2 is a schematic diagram of a motor drive circuit including a spike voltage elimination circuit of the present invention;

[0027] Figure 3 The present invention is a circuit diagram of a motor drive circuit including a spike voltage elimination circuit. DETAILED DESCRIPTION

[0028] It should be noted that Figure 1 This is an existing motor drive circuit diagram including a high-power energy-consuming resistor. Figure 1 As shown, the three groups of switch devices Q1-Q2, Q3-Q4, Q5-Q6 are controlled by the phase-splitting switch signals VH, VL, UH, UL, WH and WL provided by the control component. Q1-Q6 are turned on in turn to provide three-phase PWM drive signals to the three windings of the motor to drive the motor to rotate. In most cases, the three-phase drive signals provided by the above three groups of switch devices are connected to the three windings of the motor through wires. When the connection line between the drive control component and the motor is long, the charging and discharging process generated by the combined action of the distributed capacitance of the cable and the motor winding inductance will generate a series of spike voltages. This series of spike voltages will be superimposed on the PWM fundamental wave, although the amount of spike pulse current coupled at the input end of the motor is not large. In other words, the energy contained in the spike voltage pulse is not large, but it can still cause the commutation spark to increase when the motor rotates, and in severe cases, it may burn the motor coil or break through the insulation layer of the coil. These spike voltage pulses can cause serious failures and damage to the motor. The causes and solutions of the motor-end coupled spike pulses are currently hot research directions in the field of motor drive. Traditionally, there are two ways to overcome spike pulses: reducing the length of the transmission line as much as possible and using an absorption circuit to suppress the spike voltage.

[0029] Among them, reducing the length of the transmission line can effectively reduce the peak voltage, but because people require the comfort of the vehicles they use, the size of electric vehicles cannot be greatly reduced. Instead, the current personal cars have the requirement of increasing space. Especially for heavy-duty electric transport vehicles. Under most design conditions, the connection line between the motor and the drive mechanism is limited by the overall structural layout, and a long transmission line is an unchangeable reality.

[0030] If the absorption circuit used is a spike pulse absorption circuit, it is usually an RC absorption circuit composed of resistors and capacitors. This type of absorption circuit includes a first-order RC filter absorption circuit, or a second-order LRC filter absorption circuit composed of an inductor L, a resistor R and a capacitor C. The working principle of the RC filter absorption circuit and the LRC filter absorption circuit are the same, both of which use a low-pass filter circuit to filter out the spike voltage. These two absorption circuits have the following problems:

[0031] The energy consumption of the system increases. Since the current at the rising or falling edge of the PWM fundamental wave output by the transistor switch is large, the energy contained in its high-frequency component is much greater than the energy of the peak voltage. The above-mentioned filter circuit cannot distinguish the high-frequency component at the rising or falling edge of the PWM fundamental wave from the peak voltage generated by the transmission line. The filter circuit usually absorbs the high-frequency component of the PWM fundamental wave and the peak voltage pulse together. In order to effectively filter out the high-frequency peak wave, the absorption filter circuit will cause a large loss of the high-frequency energy of the PWM fundamental wave. In addition, the filter circuit generates a large amount of heat. The power value of the resistor R in the filter circuit generally needs to be tens of watts to hundreds of watts, which is not conducive to thermal effect design and energy consumption design. A high-power resistor is connected in parallel to the power supply bus of the motor to consume the peak voltage generated by the circuit. The power resistor itself is large in size, and the toothed heat sink attached to the high-power resistor is large in size and occupies internal space.

[0032] At the same time, the power resistor consumes energy for a long time. The power resistor consumes energy throughout the entire power supply cycle. For battery-powered vehicles, the filter circuit consumes the battery's energy and shortens the vehicle's mileage.

[0033] Moreover, high-power resistors have small resistance values ​​and high energy consumption. Usually, the ratio of power consumption to useful work of power resistors is close to 25%. High-power resistors generate a lot of heat, requiring additional conduction heat dissipation devices, which increases the complexity of the vehicle's internal structure, increases the assembly workload, and reduces the reliability of the system.

[0034] The high-power resistors used in filter circuits are generally installed on or near the circuit board. If the heat energy of the high-power resistor cannot be conducted in time, the temperature around the circuit board will rise rapidly. The increased temperature will reduce the resistance of the power resistor, further increase the power dissipated by the resistor, and thus further increase the thermal power of the resistor, resulting in the circuit not working properly and an increase in the defective rate of the product.

[0035] Moreover, the absorption filter circuit parameters are also difficult to match. There are two reasons for this. First, when the peak voltage pulse width is large, the corresponding main frequency is close to the fundamental frequency, and the parameters cannot be configured. Second, the filter parameter setting is related to the distributed parameters of the actual transmission cable. The transmission environment of the instrument debugging site and the installation site is difficult to be completely consistent. The debugged parameters may not be suitable after the instrument is installed. Therefore, it is difficult to completely eliminate the peak voltage pulse. This is due to the nature of the filter circuit, which can only suppress the amplitude of the interference. The second-order filter circuit has better filtering quality, but the inductance L is added to the armature circuit, which will have a greater impact on the dynamic performance of the motor. The implementation cost of the LRC absorption filter circuit is also high. Although inductors, resistors, and capacitors are commonly used devices, inductors involve large currents; resistors are high-power non-inductive resistors; capacitors require high frequency response and high withstand voltage; these devices usually need to be customized separately.

[0036] In order to solve the above technical problems, the present invention provides a circuit design scheme with a small circuit volume, which consumes useless work, suppresses overshoot and undershoot voltage, generates very little heat and does not waste useful work. The circuit can consume the attenuated overshoot voltage generated by the motor through the peak voltage elimination circuit, improve the reliability of the circuit operation, reduce the circuit volume, and significantly reduce the heat energy generated by the circuit.

[0037] The specific implementation modes of the present invention are described in detail below with reference to the accompanying drawings.

[0038] As attached Figure 2 As shown, Figure 2 The diagram is a schematic diagram of a motor drive circuit including the spike voltage elimination circuit of the present invention.

[0039] A first aspect of the present invention provides a compensation device for a motor drive circuit, the compensation device comprising a spike voltage elimination circuit connected between a positive power line and a negative power line of the motor drive circuit, the spike voltage elimination circuit comprising an energy dissipation resistor (RW1), a low-pass filter module, a high-pass filter module and a negative spike voltage discharge module, the low-pass filter module and the high-pass filter module each comprising at least one resistor and at least one capacitor; wherein,

[0040] The first end of the low-pass filter module, the first end of the high-pass filter module, and the first end of the negative peak voltage discharge module are connected to the positive power line, the second end of the low-pass filter module and the second end of the high-pass filter module are connected to the negative power line, and the third end of the low-pass filter module is connected to the third end of the high-pass filter module;

[0041] The energy dissipation resistor (RW1) and the first resistor (RL1) in the low-pass filter module are connected in series between the positive power line and the negative power line, and the interconnection end of the energy dissipation resistor (RW1) and the first resistor (RL1) is connected to the second end of the negative peak voltage discharge module, and the resistance value of the energy dissipation resistor (RW1) is not less than the first resistance value threshold.

[0042] According to some embodiments, an energy-consuming resistor (RW1) and a first resistor (RL1) in a low-pass filter module are connected in series between a positive power line and a negative power line. Since the resistance value of the energy-consuming resistor (RW1) is not less than a first resistance value threshold, this series resistor circuit is generally equivalent to a high-resistance consumption load resistor. This series resistor circuit can overcome the technical problems of large volume and high energy consumption caused by the use of high-power resistors with small resistance values ​​in related technologies. It generates very little heat, does not generate a large amount of heat, has almost zero useful work loss, does not waste useful work, can improve the reliability of circuit operation, reduce the volume of the circuit, and significantly reduce the heat energy generated by the circuit.

[0043] In some embodiments, the low-pass filter module is used to filter out the high-frequency components of the spike voltage, and the high-pass filter module is used to filter out the low-frequency components of the spike voltage. Therefore, the technical problems of difficult parameter matching and low filtering amount of spike voltage pulses caused by only using the low-pass filter module in the prior art can be overcome, useless work can be consumed, overshoot and undershoot voltages can be suppressed, and the attenuated overshoot voltage generated by the circuit consumption motor can be eliminated.

[0044] In some embodiments, the negative spike voltage discharge module is used to provide a discharge channel for the negative spike voltage, thereby further improving the filtering amount of the spike voltage pulse, preventing the negative spike voltage from affecting the operation of the motor, and improving the reliability of the circuit operation.

[0045] Example 1

[0046] As attached Figure 3 As shown, Figure 3 The present invention is a motor drive circuit diagram including the spike voltage elimination circuit of the present invention. The low-pass filter module in the spike voltage elimination circuit of the present invention includes a second-order low-pass filter, and the second-order low-pass filter includes a first resistor (RL1), a second resistor (RL2), a first capacitor (CL1), and a second capacitor (CL2); wherein,

[0047] A first end of the first resistor (RL1) is connected to a positive power line, and a second end of the first resistor (RL1) is connected to a first end of an energy dissipation resistor (RW1), a first end of a second resistor (RL2), a first end of a first capacitor (CL1), and a second end of a negative peak voltage discharge module;

[0048] The second end of the second resistor (RL2) and the first end of the second capacitor (CL2) are connected to the third end of the high-pass filter module, and the second end of the first capacitor (CL1) and the second end of the second capacitor (CL2) are connected to the negative power line.

[0049] Among them, the positive power line and the negative power line can be powered by a battery. In this case, the potential of the positive power line can be, for example, the power potential of the battery, and the potential of the negative power line can be, for example, a low potential. The first resistor (RL1) and the energy consumption resistor (RW1) can be regarded as connected between the power potential and the low potential. Since the resistance value of their series connection is very large, the current flowing through it is small. Under the normal operating voltage of 36-72V for electric vehicles, the current flowing through the resistor series circuit is small, and the power consumed in the load resistor is also very small.

[0050] According to some embodiments, by using a second-order low-pass filter, since the filtering effect of the second-order low-pass filter is better than that of the first-order RC low-pass filter, the filtering effect of the spike voltage can be improved.

[0051] In some embodiments, the second-order low-pass filter is composed of a first resistor (RL1), a second resistor (RL2), a first capacitor (CL1), and a second capacitor (CL2). The selection requirement of the resistance or capacitance value can be to cover the high-frequency component of the peak voltage generated by the transmission line of this vehicle model.

[0052] For example, in the present invention, the resistance value selected by the first resistor (RL1) can be smaller than the second resistance threshold, the second resistance threshold is not greater than the first resistance threshold, and the capacitance values ​​of the first capacitor (CL1) and the second capacitor (CL2) can be greater than the first capacitance threshold, so that the high-frequency components of the main peak voltage can be filtered out by this second-order low-pass filter.

[0053] As described in the compensation device of the present invention, the high-pass filter module in the peak voltage elimination circuit of the present invention comprises a T-shaped high-pass filter, and the T-shaped high-pass filter comprises a third resistor (RL3), a third capacitor (CH1) and a fourth capacitor (CH2); wherein,

[0054] A first end of the third capacitor (CH1) is connected to the positive power line, a second end of the third capacitor (CH1) is connected to a first end of the fourth capacitor (CH2) and a first end of the third resistor (RL3), a second end of the fourth capacitor (CH2) is connected to a third end of the low-pass filter module, and a second end of the third resistor (RL3) is connected to the negative power line.

[0055] As described in the compensation device of the present invention, the negative peak voltage discharge module in the peak voltage elimination circuit of the present invention comprises a first diode (D1) and a second diode (D2); wherein,

[0056] The anode of the first diode (D1) and the cathode of the second diode (D2) are connected to the positive power line, and the cathode of the first diode (D1) and the anode of the second diode (D2) are connected to the interconnection end of the energy loss resistor (RW1) and the first resistor (RL1).

[0057] In the compensation device of the present invention, the resistance value range of the resistors in the low-pass filter module and the high-pass filter module is: 20-150Ω; the first resistance threshold is 1KΩ, that is, the resistance value of the energy-consuming resistor (RW1) is ≥1KΩ.

[0058] For example, the resistance value range of the first resistor (RL1), the second resistor (RL2), and the third resistor (RL3) in the circuit of Example 1 is 20-150Ω. The peak voltage is mainly consumed in the circuit.

[0059] In the compensation device of the present invention, the resistance value range of the resistors in the low-pass filter module and the high-pass filter module is: 50-80Ω; the first resistance threshold is 10KΩ, that is, the resistance value of the energy-consuming resistor (RW1) is ≥10KΩ.

[0060] For example, the resistance value of the energy dissipation resistor (RW1) in the circuit of Embodiment 1 is greater than 10KΩ, and its function in the circuit is to provide a discharge channel for the first capacitor (CL1), the second capacitor (CL2), the third capacitor (CH1) and the fourth capacitor (CH2), thereby further improving the reliability of the low-pass filter module and the high-pass filter module.

[0061] As in the compensation device of the present invention, the resistors in the low-pass filter module and the high-pass filter module are composed of a plurality of sub-resistors connected in parallel, and the resistance values ​​of the plurality of sub-resistors are the same.

[0062] For example, each of the first resistor (RL1), the second resistor (RL2), and the third resistor (RL3) may be formed by connecting a plurality of sub-resistors in parallel, and the resistance values ​​of the plurality of sub-resistors are the same.

[0063] For example, the first resistor (RL1) can be connected in parallel with a plurality of sub-resistors according to actual requirements; by connecting a plurality of sub-resistors in parallel, a larger power margin can be obtained.

[0064] In the compensation device of the present invention, the capacitance value of the capacitor in the low-pass filter module is ≥3uF; and the capacitance value of the capacitor in the high-pass filter module is ≤0.5uF.

[0065] For example, in the circuit of Example 1, the first capacitor (CL1) and the second capacitor (CL2) are: multi-layer ceramic capacitors (MLCC) with a rated voltage of 100V and a capacitance of 10uF to 16uF; the typical value is 16uF. The third capacitor (CH1) and the fourth capacitor (CH2) are capacitors with a rated voltage of 100V and a capacitance of 0.1uF.

[0066] As in the compensation device of the present invention, the capacitance value range of the capacitor in the low-pass filter module is: 10uF ~ 16uF; the capacitance value of the capacitor in the high-pass filter module is ≤0.1uF.

[0067] As in the compensation device of the present invention, the capacitor in the low-pass filter module is composed of a plurality of sub-capacitors connected in parallel, and the capacitance values ​​of the plurality of sub-capacitors are the same or different.

[0068] For example, the first capacitor (CL1) and the second capacitor (CL2) may be formed by connecting a plurality of sub-capacitors in parallel.

[0069] For example, the first capacitor (CL1) can be connected in parallel with sub-capacitors of different capacitances or sub-capacitors of the same capacitance according to actual conditions, in order to obtain a larger capacitance without causing the volume of a single capacitor on the circuit board to be too large.

[0070] As described in the compensation device of the present invention, the motor drive circuit is a multi-phase bridge drive circuit, typically with Figure 3 In the three-phase bridge drive circuit shown, the midpoint of each bridge arm in the three-phase bridge drive circuit is connected to a terminal of any drive coil of the motor, and the other ends of the three drive coils are interconnected; the high potential end of each bridge arm is connected to the positive power line, and the low potential end of each bridge arm is connected to the negative power line.

[0071] In the compensation device of the present invention, the motor drive circuit does not have a high-power low-resistance resistor connected across the positive power line and the negative power line.

[0072] Finally, it should be noted that the above implementation modes are only used to illustrate the technical solutions of the embodiments of the present invention and are not intended to limit them. Although the embodiments of the present invention have been described in detail with reference to the above preferred implementation modes, those skilled in the art should understand that the technical solutions of the embodiments of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A compensation device for a motor drive circuit, characterized in that: The compensation device comprises a spike voltage elimination circuit connected between a positive power line and a negative power line of a motor drive circuit, wherein the spike voltage elimination circuit comprises an energy-consuming resistor (RW1), a low-pass filter module, a high-pass filter module and a negative spike voltage discharge module, wherein each of the low-pass filter module and the high-pass filter module comprises at least one resistor and at least one capacitor; wherein, The first end of the low-pass filter module, the first end of the high-pass filter module, and the first end of the negative peak voltage discharge module are connected to the positive power line, the second end of the low-pass filter module and the second end of the high-pass filter module are connected to the negative power line, and the third end of the low-pass filter module is connected to the third end of the high-pass filter module; The energy dissipation resistor (RW1) and the first resistor (RL1) in the low-pass filter module are connected in series between the positive power line and the negative power line, and the interconnected end of the energy dissipation resistor (RW1) and the first resistor (RL1) is connected to the second end of the negative peak voltage discharge module, and the resistance value of the energy dissipation resistor (RW1) is not less than a first resistance value threshold.

2. The compensation device according to claim 1, characterized in that: The low-pass filtering module includes a second-order low-pass filter.

3. The compensation device according to claim 2, characterized in that: The second-order low-pass filter comprises the first resistor (RL1), the second resistor (RL2), the first capacitor (CL1), and the second capacitor (CL2); wherein, A first end of the first resistor (RL1) is connected to the positive power line, and a second end of the first resistor (RL1) is connected to a first end of the energy dissipation resistor (RW1), a first end of the second resistor (RL2), a first end of the first capacitor (CL1), and a second end of the negative peak voltage discharge module; The second end of the second resistor (RL2) and the first end of the second capacitor (CL2) are connected to the third end of the high-pass filter module, and the second end of the first capacitor (CL1) and the second end of the second capacitor (CL2) are connected to the negative power line.

4. The compensation device according to claim 1, characterized in that: The high-pass filter module includes a T-shaped high-pass filter.

5. The compensation device according to claim 4, characterized in that: The T-shaped high-pass filter comprises a third resistor (RL3), a third capacitor (CH1) and a fourth capacitor (CH2); wherein, A first end of the third capacitor (CH1) is connected to the positive power line, a second end of the third capacitor (CH1) is connected to a first end of the fourth capacitor (CH2) and a first end of the third resistor (RL3), a second end of the fourth capacitor (CH2) is connected to a third end of the low-pass filter module, and a second end of the third resistor (RL3) is connected to the negative power line.

6. The compensation device according to claim 1, characterized in that: The negative peak voltage discharge module comprises a first diode (D1) and a second diode (D2); wherein, The anode of the first diode (D1) and the cathode of the second diode (D2) are connected to the positive power line, and the cathode of the first diode (D1) and the anode of the second diode (D2) are connected to the interconnection end of the energy dissipation resistor (RW1) and the first resistor (RL1).

7. The compensation device according to claim 1, characterized in that: The resistance value range of the resistors in the low-pass filter module and the high-pass filter module is: 20-150Ω; the first resistance threshold is 1KΩ.

8. The compensation device according to claim 7, characterized in that: The resistance value range of the resistors in the low-pass filter module and the high-pass filter module is 50-80Ω; the first resistance threshold is 10KΩ.

9. The compensation device according to claim 1, characterized in that: The capacitance value of the capacitor in the low-pass filter module is ≥3uF; the capacitance value of the capacitor in the high-pass filter module is ≤0.5uF.

10. The compensation device according to claim 9, characterized in that The capacitance value range of the capacitor in the low-pass filter module is: 10uF~16uF; the capacitance value of the capacitor in the high-pass filter module is ≤0.1uF.

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