Power supply circuit for driving insulated gate bipolar transistor

Abstract

The utility model discloses a power supply circuit for driving an insulated gate bipolar transistor, and belongs to the technical field of insulated gate bipolar transistor driving. The input end of the input filtering module is connected with an input power supply; the clock module is connected with the output end of the input filtering module; the signal processing module is connected with the output end of the clock module; the power driving module is connected with the output end of the signal processing module; the primary side of the isolation transformer is connected with the output end of the power driving module; the rectifier module is connected with the secondary side of the isolation transformer; the output filtering module is connected with the output end of the rectification module. The beneficial effects of the technical scheme are that front-stage and back-stage high voltage isolation is realized, the voltage-resistant isolation performance is relatively high, the magnitude of current flowing through the isolation transformer can be controlled, the output voltage is more stable, the circuit structure is simple, and the cost is low.

Description

TECHNICAL FIELD

[0001] The utility model relates to the insulated gate bipolar transistor drive technical field, especially to a power supply circuit. BACKGROUND

[0002] DC-DC (Direct Current-Direct Current, DC-DC) power supply is widely used in electronic equipment, in order to prevent the influence of high voltage on the former stage, the former stage circuit and the latter stage circuit are isolated, and an isolation power supply is needed, especially for the power supply of 3000V and above high-voltage IGBT (Insulate-Gate Bipolar Transistor, IGBT) drive unit, the closed-loop control circuit will reduce the overall voltage resistance, under the influence of high voltage, the safety and signal stability of the devices between the former stage and the latter stage cannot be guaranteed.

[0003] In the prior art, the Chinese utility model patent with publication number CN211859952U discloses an isolation DC-DC power supply, as shown in Figure 1 The control circuit assembly 1 includes a power supply network 11, a PWM controller 12, a power tube driver 13, a resistance-capacitance biasing network 14 and an isolation feedback module 15, the power circuit assembly 2 includes an input network 21, a transformer 22, a power assembly 23 and an output network 24, the input end of the PWM controller 12 is electrically connected with the isolation feedback module 15, and the output voltage is fed back to the PWM (pulse width modulation) signal end in the form of stabilizing the voltage output, but it cannot withstand high voltage, and if high-voltage feedback devices are used, the manufacturing cost will increase, which is not conducive to the production and promotion of products; the power supply network 11 and the input network 21 are divided into two input ends, which increases the complexity of the circuit and is inconvenient in actual application. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a power supply circuit for insulated gate bipolar transistor drive, solving the above technical problems.

[0005] A power supply circuit for insulated gate bipolar transistor drive, comprising,

[0006] An input filter module, the input end of the input filter module is connected with an input power supply;

[0007] A clock module, connected with the output end of the input filter module;

[0008] A signal processing module, connected with the output end of the clock module;

[0009] a power driving module connected to an output end of the signal processing module;

[0010] an isolation transformer, a primary side of the isolation transformer being connected to an output end of the power driving module;

[0011] a rectifying module connected to a secondary side of the isolation transformer;

[0012] an output filtering module connected to an output end of the rectifying module.

[0013] Preferably, the input filtering module comprises,

[0014] a voltage-dependent resistor connected in parallel with the input power supply;

[0015] a first electrolytic capacitor connected in parallel with the voltage-dependent resistor.

[0016] Preferably, the clock module comprises,

[0017] a signal generator connected to an output end of the input filtering module;

[0018] a timer connected to an output end of the signal generator;

[0019] a timer connected to an output end of the signal generator;

[0020] a crystal oscillator connected to the signal generator for driving the signal generator to generate a waveform signal.

[0021] Preferably, a magnetic core of the isolation transformer is a ferrite magnetic core, a primary winding and a secondary winding of the isolation transformer are both wound by multi-layer insulation enameled wire, and an insulation layer is arranged between the primary winding and the secondary winding.

[0022] Preferably, the signal processing module comprises,

[0023] a transistor, a base of the transistor being connected to an output end of the clock module, for amplifying the waveform signal to obtain an amplified signal;

[0024] a first integrated circuit chip, an input end of the first integrated circuit chip being connected to a collector of the transistor, for receiving the amplified signal and performing filtering and signal amplification processing to output an analog signal;

[0025] a second integrated circuit chip, an input end of the second integrated circuit chip being connected to an output end of the first integrated circuit chip, for receiving and converting the analog signal into the pulse width modulation signal and then outputting.

[0026] Preferably, the first integrated circuit chip is an analog signal integrated circuit chip, and the second integrated circuit chip is a digital signal integrated circuit chip.

[0027] Preferably, the rectifier module is a diode.

[0028] Preferably, the output filter module comprises,

[0029] an inductor, a first end of the inductor being connected to a first output end of the rectifier module;

[0030] a second electrolytic capacitor, a first end of the second electrolytic capacitor being connected to a second end of the inductor, and a second end of the second electrolytic capacitor being connected to a second output end of the rectifier module.

[0031] Preferably, the power supply module comprises,

[0032] a power supply module, an input end of the power supply module being connected to the input filter module, and output ends of the power supply module being respectively connected to the clock module and the signal processing module, for converting a voltage of the input power supply and transmitting the voltage to the clock module and the signal processing module.

[0033] Preferably, the power supply module is a voltage converter.

[0034] The utility model discloses a beneficial effect is: through the isolation transformer realizes high voltage isolation of former stage and rear stage, has higher voltage isolation performance, can control the current of flowing through the isolation transformer, makes output voltage more stable, and circuit structure is simple, and the cost is low. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 is the schematic diagram of the isolation DC-DC power supply in the prior art;

[0036] Figure 2 is the schematic diagram of the power supply circuit for the insulated gate bipolar transistor drive of the utility model;

[0037] Figure 3 is the circuit diagram of the input filter module of the utility model;

[0038] Figure 4 is the circuit diagram of the output filter module of the utility model.

[0039] In the drawing: 1, control circuit assembly; 11, power supply network; 12, PWM controller; 13, power tube driver; 14, resistance-capacitance bias network; 15, isolation feedback module; 2, power circuit assembly; 21, input network; 22, transformer; 23, power assembly; 24, output network; 3, input filter module; 31, power supply module; 4, clock module; 5, signal processing module; 6, power drive module; 7, isolation transformer; 8, rectifier module; 9, output filter module; 10, load. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0041] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0042] The present application will be further described below with reference to the drawings and specific embodiments, but is not limited to the present application.

[0043] A power supply circuit for insulated gate bipolar transistor driving, as shown in Figure 2 includes,

[0044] An input filter module 3, the input end of the input filter module 3 is connected to an input power supply;

[0045] A clock module 4, connected to the output end of the input filter module 3, for outputting a waveform signal;

[0046] A signal processing module 5, connected to the output end of the clock module 4, for processing the waveform state of the waveform signal, and outputting a pulse width modulation signal;

[0047] A power drive module 6, connected to the output end of the signal processing module 5, receiving the pulse width modulation signal, and being turned off and turned on under the action of the pulse width modulation signal;

[0048] An isolation transformer 7, the primary side of the isolation transformer 7 is connected to the output end of the power drive module 6;

[0049] A rectifier module 8, connected to the secondary side of the isolation transformer 7, for rectifying the alternating current output by the isolation transformer 7 into direct current;

[0050] An output filter module 9, connected to the output end of the rectifier module 8.

[0051] Specifically, the utility model provides a kind of power supply circuit for insulated gate bipolar transistor drive, the output end of output filter module 9 is connected load 10, load 10 can be the IGBT drive unit of rear stage, can also be drive substrate, by isolating transformer 7 to make high voltage side and low voltage side isolation, guarantee the safety and anti-interference ability of circuit, using open loop control mode, with the square wave signal of fixed frequency sent by clock module 4, after signal processing module 5 control transmission to power drive module 6 on the current variation of isolating transformer 7 is controlled, the change of voltage is realized, again after rectification and filtering, it is output to become stable signal, with higher withstand voltage performance, circuit structure is simple, output voltage is more stable.

[0052] In a preferred embodiment, referring to Figure 3 Input filter module 3 includes,

[0053] The voltage of the input power supply is filtered by the input filter module 3, and the input signal is more stable, and the device is prevented from being damaged due to voltage mutation.

[0054] The first electrolytic capacitor C1 is connected in parallel with the voltage-dependent resistor R.

[0055] Specifically, the input power supply is directly connected to the input filter module 3, and the power input voltage signal is filtered to make the input signal more stable and avoid damage to the device due to voltage mutation.

[0056] The input filter module 3 includes, but is not limited to, the voltage-dependent resistor R and the first electrolytic capacitor C1.

[0057] When the input voltage ripple is large, the first electrolytic capacitor C1 can reduce the input power supply voltage ripple.

[0058] When the voltage value of the input voltage has a large mutation upward, the voltage-dependent resistor R can consume the part of energy, and protect the subsequent circuit from being damaged by the high voltage.

[0059] In a preferred embodiment, the clock module 4 includes,

[0060] The signal generator is connected to the output end of the input filter module 3 and is used to send a waveform signal.

[0061] The timer is connected to the output end of the signal generator and is used to receive the waveform signal and count.

[0062] The timer is connected to the output end of the signal generator and is used to count the waveform signal.

[0063] The crystal oscillator is connected to the signal generator and is used to drive the signal generator to send a waveform signal.

[0064] Specifically, the output of the signal generator is directly connected to the clock input of the timer and the clock input of the timer, providing a reference clock signal for the timer and the timer.

[0065] At the same time, in some cases (such as when the frequency needs to be adjusted in cooperation with the crystal oscillator), the output of the signal generator is connected to the oscillator input of the crystal oscillator.

[0066] The signal generator generates an electrical signal with a specific frequency and waveform (such as the commonly seen square wave, sine wave, etc.), serving as the basic signal source for the entire clock module 4.

[0067] For example, the signal generator can generate a square wave signal with a frequency of 50 kHz, which is the time reference for subsequent circuit timing, timing, and signal processing operations.

[0068] The accuracy and stability of the square wave signal frequency are crucial for the timing control of the entire circuit. If the signal generator output frequency is unstable, it will cause the timer and the timer to be inaccurate, thereby affecting the timing of the entire circuit, causing the timing of the IGBT drive signal to be chaotic, affecting the normal switching of the IGBT, and even damaging the IGBT and other power devices.

[0069] The clock input of the timer is connected to the output of the signal generator to receive the reference clock signal for timing operation.

[0070] The output of the timer is connected to the start end of the timer (when sequential control of timing operation is required).

[0071] The timer generates a timing signal or performs a specific operation based on the clock signal provided by the signal generator after a preset time interval.

[0072] For example, set a 1ms timing period, when the timing reaches 1ms, the timer outputs a trigger signal. The trigger signal can be used to control the start or stop time of the operation in the signal processing module 5, ensuring that each operation in the circuit is performed in the predetermined time sequence, improving the reliability and predictability of the circuit operation.

[0073] For example, during the IGBT drive process, the rising and falling edges of the IGBT gate voltage need to be controlled by timing, and the timer can provide accurate time reference to ensure that the switching operation of the IGBT is performed at the correct time, avoiding problems such as increased power consumption or device damage caused by timing errors.

[0074] The clock input of the timer is connected to the output of the signal generator to obtain the reference clock signal for counting operation. The output of the timer is connected to the oscillator of the crystal oscillator.

[0075] A timer counts clock signals to measure time intervals or accumulate time.

[0076] For example, the timer can count the number of cycles that the signal processing module 5 processes signals, and when a certain count value is reached, a signal is triggered to notify the system to operate, such as adjusting the parameters of the signal processing module 5 or optimizing the output of the power driving module 6.

[0077] The timer provides a time-based control means, which helps to adjust the working state of the circuit according to time-related conditions during the operation of the circuit, ensuring that the circuit can correctly respond in different working stages, and improving the adaptability and stability of the circuit to various working conditions.

[0078] For example, in the current control process of the primary side of the isolation transformer 7, the output current of the power driving module is adjusted according to the count value of the timer to achieve precise control of the input current of the isolation transformer 7, thereby ensuring that the secondary side of the isolation transformer 7 can output stable voltage and current to meet the power supply requirements of high-voltage IGBT driving.

[0079] The crystal oscillator is connected to an oscillation circuit (including elements such as amplifiers), and the output of the oscillation circuit is fed back to the crystal oscillator itself to maintain stable oscillation of the crystal oscillator, and on the other hand, the output of the oscillation circuit is connected to the signal processing module 5 to provide a stable clock frequency signal for the signal processing module 5.

[0080] The crystal oscillator uses the piezoelectric effect of the crystal to generate a highly stable clock frequency signal.

[0081] For example, the crystal oscillator frequency is 1MHz, 10MHz, etc.

[0082] In this power supply circuit, the stable frequency signal provided by the crystal oscillator is crucial to ensure the timing accuracy and stability of the entire circuit.

[0083] When the signal processing module 5 processes the waveform signal input by the clock module 4, it needs a stable clock reference to accurately perform signal processing operations such as data sampling and signal conversion.

[0084] The stable frequency provided by the crystal oscillator allows various digital circuits (such as logic circuits in IC chips) in the signal processing module 5 to work according to precise timing, avoiding signal processing errors caused by clock frequency drift.

[0085] In the power driving module 6, a stable clock frequency also helps to accurately control the switching frequency of the IGBT, improve the driving efficiency, and reduce power loss and electromagnetic interference.

[0086] The stability of the crystal oscillator is generally higher than that of a common signal generator, and can maintain a relatively stable frequency output under environmental conditions such as temperature change, power voltage fluctuation, etc., thereby providing a reliable clock basis for the entire high-voltage IGBT driving power supply circuit.

[0087] The clock module 4 includes but is not limited to a signal generator, a timer, a clock, and a crystal oscillator. By outputting a signal waveform of a certain frequency, the clock module 4 serves as a stable source input signal for the signal processing module 5.

[0088] In a preferred embodiment, the magnetic core of the isolation transformer 7 is made of ferrite material, and the primary winding and the secondary winding of the isolation transformer 7 are both wound with multi-layer insulation enameled wire, and an insulation layer is provided between the primary winding and the secondary winding.

[0089] Specifically, the magnetic core of the isolation transformer 7 is made of high-frequency ferrite material, which has the characteristics of high magnetic permeability, low loss, and high resistivity, to meet the requirements of high-frequency working environment.

[0090] The primary winding and the secondary winding are wound with multi-layer insulation enameled wire, and an insulation layer composed of high-performance insulation materials such as polyimide film is provided between the windings, which can efficiently transmit electrical energy under high-frequency signals, effectively isolate the electrical connection between the input side and the output side, realize high-voltage isolation between the front and rear stages, and ensure stable and reliable operation of the power supply circuit in high-frequency and high-isolation demand scenarios. It has high voltage isolation performance and can control the amount of current flowing through the isolation transformer 7, making the output voltage more stable.

[0091] In a preferred embodiment, the signal processing module 5 includes,

[0092] a transistor, the base of the transistor being connected to the output of the clock module 4, for amplifying the waveform signal to obtain an amplified signal;

[0093] a first integrated circuit chip, the input of the first integrated circuit chip being connected to the collector of the transistor, for receiving the amplified signal and performing filtering and signal amplification processing to output an analog signal;

[0094] a second integrated circuit chip, the input of the second integrated circuit chip being connected to the output of the first integrated circuit chip, for receiving and converting the analog signal into a pulse width modulation signal and then outputting the pulse width modulation signal;

[0095] The first integrated circuit chip is an analog signal integrated circuit chip, and the second integrated circuit chip is a digital signal integrated circuit chip.

[0096] Specifically, the transistor can be a bipolar junction transistor (BJT) or a field effect transistor (FET). When the transistor is a BJT, the base of the transistor is connected to the output of the clock module 4 to receive the input signal from the clock module 4, the collector of the transistor is connected to the input of the subsequent first integrated circuit chip, and the emitter of the transistor is grounded.

[0097] When the transistor is a FET, the gate of the transistor is connected to the output of the clock module 4 to receive the input signal from the clock module 4, the drain of the transistor is connected to the input of the subsequent first integrated circuit chip, and the source of the transistor is grounded.

[0098] The transistor mainly plays a role of signal amplification and switching control in the signal processing module 5. When receiving the waveform signal transmitted by the clock module 4, the transistor can amplify the current of the signal according to the change of the signal level (for example, for a BJT, the change of the base voltage controls the change of the collector current), so as to enhance the driving ability of the signal and enable the subsequent circuit to better receive and process the signal.

[0099] The transistor can also serve as an electronic switch to control the on-off of the signal according to the high and low levels of the input signal, and to preliminarily shape or modulate the input waveform.

[0100] For example, the weak input signal is converted into a signal waveform with certain driving ability and suitable for subsequent chip processing, thereby laying a foundation for the processing of the subsequent analog signal integrated circuit chip.

[0101] The input of the analog signal integrated circuit chip is connected to the output of the transistor to receive the signal processed by the transistor. The output of the analog signal integrated circuit chip is connected to the input of the digital signal integrated circuit chip.

[0102] The analog signal integrated circuit chip can realize functions such as filtering of the signal (removing unnecessary frequency components to further stabilize the signal), linear amplification of the signal (enhancing the signal amplitude by a certain proportion while maintaining the linear characteristic of the signal), modulation of the signal (for example, adjusting the frequency, phase, etc. of the signal), and the like.

[0103] For example, the analog signal integrated circuit chip filters and accurately amplifies the analog signal output by the transistor, which contains certain noise or has an inappropriate amplitude, so as to make the waveform of the signal more regular and the amplitude more suitable for the subsequent digital signal processing, thereby converting the analog signal to a stable and appropriate waveform state expected finally, and providing a high-quality analog input signal for the subsequent digital signal integrated circuit chip to accurately perform the operation of analog-digital conversion and the like.

[0104] The input end of the digital signal integrated circuit chip is connected to the output end of the analog signal integrated circuit chip to receive the processed analog signal, and then the processed analog signal is processed by the internal digital circuit (such as an analog-to-digital converter, a logic circuit, etc.) of the digital signal integrated circuit chip, and finally a PWM (pulse width modulation signal) signal is output from the output end of the digital signal integrated circuit chip and sent to the power driving module 6.

[0105] The digital signal integrated circuit chip first converts the received analog signal into a digital signal by the internal analog-to-digital converter (ADC), and then processes the digital signal according to a pre-set algorithm and logic by the internal digital logic circuit (such as a counter, a comparator, a register, etc.).

[0106] For example, the digital signal levels at different times are compared by the comparator, the output digital signal state is adjusted according to the comparison result, and finally a PWM signal is generated after appropriate encoding and other operations. This PWM signal can accurately control the switching action of the power driving module 6, thereby realizing effective control of the current in the isolation transformer 7, and is a key link for the entire circuit to realize power conversion and driving control, ensuring that the entire high-voltage IGBT driving power supply circuit can work in the desired manner and provide stable and appropriate power supply for the driving substrate.

[0107] The clock module 4 outputs a 150kHz square wave signal, which enters the signal processing module 5. The signal processing module 5 is processed by the internal transistor, analog signal integrated circuit chip and digital signal integrated circuit chip. Among them, the digital signal integrated circuit chip will perform frequency division operation on the 150kHz signal.

[0108] After receiving the 30kHz PWM signal, the power driving module 6 performs conduction and shutdown operations according to the high and low levels of the PWM signal. When the PWM signal is high, the power driving module 6 outputs a current of a certain size, so that the primary side of the isolation transformer 7 has a current passing through; when the PWM signal is low, the power driving module 6 changes the size of the output current or turns off, so that the current in the primary side of the isolation transformer 7 changes. A current change signal with a frequency of 30kHz is generated at the primary side of the isolation transformer 7, and through the principle of electromagnetic induction, the corresponding alternating current is generated at the secondary side of the isolation transformer 7. The rectifier module 8 rectifies the alternating current into direct current, and the output filter module 9 filters the direct current to provide stable direct current power for the IGBT driving substrate, finally realizes effective driving of the IGBT, and meets the power supply requirements of industrial motor driving.

[0109] In a more preferred embodiment, the rectifier module 8 is a diode.

[0110] Specifically, the rectifier module 8 uses a diode to rectify the alternating signal generated at the secondary side of the isolation transformer 7 into a direct current signal.

[0111] In the half-wave rectification embodiment, the anode of the diode is connected to the first end of the alternating current signal output by the secondary side of the isolation transformer 7, and the cathode of the diode is connected to the first end of the input end of the output filter module 9. At the same time, the second end of the alternating current signal output by the secondary side of the isolation transformer 7 is directly connected to the second end of the input end of the output filter module 9.

[0112] When the alternating current signal output by the secondary side of the isolation transformer 7 makes the anode potential of the diode higher than the cathode potential (positive half cycle), the diode is turned on, and the current flows through the diode to the output filter module 9; when the alternating current signal is in the negative half cycle, the anode potential of the diode is lower than the cathode potential, and the diode is cut off, at this time no current passes through the diode. Only the positive half cycle of the alternating current signal can pass through the diode to reach the output filter module 9, realizing half-wave rectification, which can be used in simple application scenarios with low DC output requirements and small power. The isolation transformer 7 realizes the isolation of the signals on the primary side and the secondary side, realizes different voltage transformation ratios through different turns ratios, and the isolation transformer 7 adopts a larger size to realize a higher withstand voltage value.

[0113] The signal output by the clock module 4 is adjusted into a PWM signal by the signal processing module 5 to control the turn-on and turn-off of the power driving module 6, change the current passing through the isolation transformer 7, and finally affect the output voltage of the isolation transformer 7. Through rectification and filtering, the final output voltage is more stable and reliable. By using an open-loop control method, the circuit has a high isolation withstand voltage value, and is simple in structure, easy to implement and low in cost.

[0114] In a more preferred embodiment, with reference to Figure 4 , the output filter module 9 comprises,

[0115] an inductor L, a first end of the inductor L being connected to the first output end of the rectification module 8;

[0116] a second electrolytic capacitor C2, a first end of the second electrolytic capacitor C2 being connected to a second end of the inductor L, and a second end of the second electrolytic capacitor C2 being connected to the second output end of the rectification module 8.

[0117] Specifically, the output filter module 9 comprises the inductor L and the second electrolytic capacitor C2, the direct current signal obtained by rectifying the rectification module 8 is filtered through the inductor L to reduce the ripple current, and then filtered again through the second electrolytic capacitor C2 to make the output capacitor more stable without excessive ripple.

[0118] In a more preferred embodiment, further comprising,

[0119] The input end of the power supply module 13 is connected to the input filter module 3, and the output end of the power supply module 13 is respectively connected to the clock module 4 and the signal processing module 5, for converting the voltage of the input power supply and transmitting to the clock module 4 and the signal processing module 5.

[0120] Specifically, since the voltage value range of the input voltage fluctuates greatly, it cannot be applied to the integrated circuit chip, so the power supply module 13 needs to supply power to avoid the case that the integrated circuit chip is damaged due to the overshoot voltage.

[0121] In a preferred embodiment, the power supply module 13 is a voltage converter (DC / DC converter), which converts the input voltage into a power supply voltage suitable for the input of the integrated circuit chip, and provides a stable power supply input for the integrated circuit chip.

[0122] Specifically, when the input power supply voltage is 40V, the power supply voltage of the integrated circuit chip is 24V, and the power supply module 13 changes the voltage of 40V to 24V to supply power to the integrated circuit chip.

[0123] The power drive module 6 receives the PWM signal processed by the signal processing module 5, wherein when the PWM signal is at a high level output signal, the power drive module 6 outputs a first current, and when the PWM signal is at a low level output signal, the power drive module 6 changes the size of the first current, and through the continuous change of the high and low levels in the PWM signal, the current flowing through the isolation transformer 7 is also continuously changing, and through the continuously changing current, the magnetic flux passing through the isolation transformer 7 is continuously changing, and finally the current at the secondary side of the isolation transformer 7 is output, generating a certain voltage to the load 10 at the back end, realizing the control and output of the isolation transformer 7.

[0124] In an embodiment, the clock module 4 generates a raw waveform signal of a specific frequency and waveform (square wave) based on its own circuit structure (oscillation circuit) after receiving the power supply signal output by the input filter module 3.

[0125] This waveform signal serves as the basic signal source of the entire clock module 4, providing input signals for subsequent timers, timers, and the entire signal processing module 7.

[0126] The timer uses the waveform signal output by the signal generator as a clock reference for timing operation.

[0127] When a 10ms timing period is set, the timer will count according to the pulses of the received waveform signal, and each pulse represents a time unit (depending on the frequency of the signal generator). When the count reaches the number of pulses corresponding to 10ms, the timer will output a timing signal.

[0128] This timing signal can be used to control the start or stop time of the operation in the signal processing module 5, ensuring that each operation in the circuit is performed in a predetermined time sequence, improving the reliability and predictability of the circuit operation.

[0129] The timer performs counting operations on the waveform signal output by the signal generator, for measuring time intervals or accumulating time.

[0130] The timer can count the number of cycles of the signal processed by the signal processing module 5, and when the count value is reached, trigger a signal to inform the system to operate, such as adjusting the parameters of the signal processing module 5 or optimizing the output of the power driving module 6.

[0131] The timer provides a time-based control means, which helps to adjust the working state of the circuit according to time-related conditions during the operation of the circuit, ensuring that the circuit can correctly respond in different working stages, and improving the adaptability and stability of the circuit to various working conditions.

[0132] The base of the transistor is connected to the output of the clock module 4, receiving the waveform signal from the clock module 4. The collector of the transistor is connected to the input of the first integrated circuit chip (analog signal IC chip), and the emitter is grounded (or connected to a suitable bias circuit, depending on the specific circuit design).

[0133] When the waveform signal from the clock module 4 is input to the base of the transistor:

[0134] Taking BJT as an example, when the voltage between the base and the emitter changes, it will cause the change of the collector current, thereby amplifying the input waveform signal in current.

[0135] The transistor can also be used as an electronic switch to control the on-off of the signal according to the high and low levels of the input signal, and to perform preliminary shaping of the input waveform.

[0136] The analog signal IC chip first performs filtering processing on the received signal, removes high-frequency noise or unwanted frequency components in the input signal through internal filtering circuit, and makes the signal more pure.

[0137] Then, the signal is accurately linearly amplified according to a certain gain multiple, and the amplitude of the signal is adjusted to make the waveform of the signal more regular and the amplitude more consistent with the requirements of subsequent digital signal processing.

[0138] In addition, the analog signal IC chip can also modulate the signal, such as changing the frequency, phase or amplitude of the signal, etc., to convert the analog signal to the final desired stable and appropriate waveform state, providing high-quality analog input signal for subsequent digital signal IC chip to accurately perform analog-to-digital conversion and other operations.

[0139] The second integrated circuit chip (digital signal IC chip) input end is connected with the output end of the analog signal IC chip, and receives the processed analog signal.

[0140] The digital signal IC chip firstly converts the received analog signal into a digital signal through an internal analog-to-digital converter (ADC).

[0141] The digital output signal is converted into a PWM signal through encoding and modulation, etc.

[0142] The power supply circuit of the high-voltage IGBT drive has a high isolation withstand voltage value, can satisfy the isolation of the front-stage and rear-stage circuits under high-voltage conditions, and can stabilize the voltage value of the output voltage in a certain range to provide a relatively stable voltage value for the IGBT drive unit, and has a low manufacturing cost, which is beneficial to the production and promotion of the product.

[0143] The above only describes the preferred embodiments of the utility model, and does not limit the implementation and protection scope of the utility model, and those skilled in the art should realize that any equivalent replacement and obvious change obtained by applying the contents of the utility model specification and drawings should be included in the protection scope of the utility model.

Claims

1. A power supply circuit for an insulated gate bipolar transistor drive, characterized by, The utility model relates to a kind of power supply circuit, including, Input filter module, the input end of the input filter module is connected input power supply; Clock module, the output end of the input filter module is connected; Signal processing module, the output end of the clock module is connected; Power drive module, the output end of the signal processing module is connected; Isolation transformer, the output end of the power drive module is connected to the primary side of the isolation transformer; Rectifier module, the secondary side of the isolation transformer is connected; Output filter module, the output end of the rectifier module is connected.

2. The power supply circuit for an insulated gate bipolar transistor drive according to claim 1, characterized by, The input filter module includes, Zinc oxide varistor, the zinc oxide varistor is parallelly connected with the input power supply; First electrolytic capacitor, the first electrolytic capacitor is parallelly connected with the zinc oxide varistor.

3. The power supply circuit for an insulated gate bipolar transistor drive according to claim 1, wherein The clock module includes, Signal generator, the output end of the input filter module is connected; Timer, the output end of the signal generator is connected; Timer, the output end of the signal generator is connected; Crystal oscillator, the signal generator is connected, for driving the signal generator to send waveform signal.

4. The power supply circuit for an insulated gate bipolar transistor drive according to claim 1, wherein The magnetic core of the isolation transformer is ferrite magnetic core, the primary winding and the secondary winding of the isolation transformer are wound with multilayer insulating enamel wire, and the primary winding and the secondary winding are provided with an insulating layer.

5. The power supply circuit for an insulated gate bipolar transistor drive according to claim 1, wherein The signal processing module includes, Transistor, the base of the transistor is connected with the output end of the clock module; First integrated circuit chip, the input end of the first integrated circuit chip is connected with the collector of the transistor; Second integrated circuit chip, the input end of the second integrated circuit chip is connected with the output end of the first integrated circuit chip.

6. The power supply circuit for an insulated gate bipolar transistor driven according to claim 5, wherein The first integrated circuit chip is analog signal integrated circuit chip, and the second integrated circuit chip is digital signal integrated circuit chip.

7. The power supply circuit for an insulated gate bipolar transistor drive according to claim 1, wherein The rectifier module is diode.

8. The power supply circuit for an insulated gate bipolar transistor drive according to claim 1, wherein The output filter module includes, Inductor, the first end of the inductor is connected with the first output end of the rectifier module; Second electrolytic capacitor, the first end of the second electrolytic capacitor is connected with the second end of the inductor, and the second end of the second electrolytic capacitor is connected with the second output end of the rectifier module.

9. The power supply circuit for an insulated gate bipolar transistor driven according to claim 1, characterized by, Further including, Power supply module, the input end of the power supply module is connected with the input filter module, and the output end of the power supply module is connected with the clock module and the signal processing module respectively.

10. The power supply circuit for an insulated gate bipolar transistor driven according to claim 9, characterized in that, The power supply module is voltage converter.

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