Novel high-power inverter power supply

Abstract

The utility model relates to a novel high-power inverter power supply. Comprising a battery access module, a pre-stage circuit module, a post-stage circuit module, a protection module, a heat dissipation module, a control module and a state display module, wherein the pre-stage circuit module mainly comprises a pulse width modulation signal generation circuit, a push-pull circuit, a switch switching circuit, a booster circuit, a rectification filter circuit and an auxiliary power supply circuit. According to the utility model, the contradiction that the current inverter power supply cannot be compatible to start an impact load and ensure long-time work under high power is solved, the service life is prolonged, the stability is improved, and the inverter power supply is energy-saving, environment-friendly and low in noise.

Description

TECHNICAL FIELD

[0001] The utility model belongs to inverter power supply field relates to a novel high -power inverter power supply. BACKGROUND

[0002] Inverter power supply is also called inverter, it is a kind of device that converts DC power (battery, storage battery) into AC power (generally 220V, 50Hz sine wave), generally includes battery input circuit, auxiliary power supply, front stage circuit, back stage circuit, protection circuit, state indicating circuit, control circuit etc..With the development of science and technology and the increasing demand of people on mobile power, portable inverter power supply plays an increasingly important role in outdoor activities, emergency rescue, construction site and home standby etc..The existing portable inverter power supply, especially high -power inverter power supply, has problems such as unstable work, often false protection under impact load etc..Because the electric equipment will have instantaneous high power when starting, especially the power consumed by impact load in starting moment is larger than nominal power, if inverter power supply still takes nominal power as the threshold of starting protection circuit, it is difficult to start such impact load.Taking conventional 3000W high -power inverter power supply as an example, the threshold of its protection circuit is 3000W, therefore it can only connect the electric equipment whose peak power is below 3000W, and the actual power of such equipment when working stably can be 2500W, i.e. the actual load capacity of the inverter power supply when working stably for a long time is 2500W, and it cannot reach 3000W.If connecting the equipment whose working power is 3000W for a long time, the instantaneous power consumption can reach 3500W, but because it exceeds the protection threshold of conventional inverter power supply, the inverter voltage will start protection function, and cannot start such equipment;Meanwhile, the existing high -power inverter power supply has the following problems in existing anti-reverse connection circuit, under-voltage protection circuit, overcurrent protection and product heat dissipation:

[0003] Firstly, the existing anti-reverse connection circuit mainly has two kinds.The first kind is reverse parallel schottky diode scheme, as shown in Figure 1 BAT2 is battery, F1 is fuse, L8 is inductor, C22 is capacitor, D17 is schottky diode.The cathode of schottky diode is connected with F1 and L8, the anode is connected with C22 and the negative pole of battery.When battery is not connected reversely, D17 is reverse cut-off, the circuit works normally, when battery is connected reversely, the anode of schottky diode D17 is connected with the positive pole of battery, forward conduction, fuse F1 is burned out, which plays a protective role to other circuits.The biggest disadvantage of this circuit is that fuse F1 will be burned out once battery is connected reversely, and it needs to be replaced to work normally again.The second kind of anti-reverse connection circuit is anti-reverse connection protection circuit using relay, as shown in Figure 2As shown, K1 is a relay, when the battery is normally connected to the circuit, diode D18 is turned on, the coil of relay K1 has current through, causing the contacts of the relay to close, the circuit works normally, when the battery polarity is reversed, due to the one-way conductivity of diode D18, the coil of relay K1 has no current through, the contacts cannot be closed, the circuit does not work, and will not cause damage to the circuit and fuse, the disadvantage is that the relay is generally bulky, and its contacts are closed by mechanical means, with limited life.

[0004] Secondly, the under-voltage protection circuit. The battery under-voltage protection circuit is a circuit for protecting the battery from over-discharge, which monitors the voltage of the battery and automatically cuts off the load circuit of the battery when the voltage is lower than the set threshold, thereby avoiding over-discharge of the battery and protecting the service life of the battery. The conventional battery under-voltage protection circuit is often composed of a simple resistance voltage dividing circuit and a comparator. The disadvantage of this scheme is that it is easy to cause under-voltage protection and cannot start such loads when facing starting impact loads, especially when the battery power is not very sufficient.

[0005] Thirdly, the existing inverter power supply mostly uses single threshold over-current protection, that is, the same threshold value is compared with the sampling value whether in the design of the power supply or in the continuous working period. The disadvantage of this scheme is that it cannot simultaneously consider the over-current protection in the starting moment and the continuous working state of the power device.

[0006] Fourthly, the product heat dissipation of the inverter power supply is generally a combination of metal sheet heat dissipation and fan heat dissipation, but the control of the fan in the existing scheme mostly adopts a single threshold control method, that is, the fan starts at a fixed speed when the sampling temperature exceeds the set value, and stops when it is lower than the set value. There is no scheme for different speeds at different temperatures, no energy saving and noise reduction consideration, and no real-time monitoring of the running state of the fan.

[0007] Therefore, the utility model provides a novel high-power inverter power supply to solve the above problems. Utility model content

[0008] In view of the problems existing in the prior art, the utility model discloses a novel high -power inverter power supply, adopts the technical scheme, including battery access module, front stage circuit module, back stage circuit module, protection module, heat dissipation module, control module, state display module, the front stage circuit module mainly includes pulse width modulation signal generation circuit, push -pull circuit, switch switching circuit, boost circuit, rectifier filter circuit, auxiliary power supply circuit, the pulse width modulation signal generation circuit adopts pulse width modulation signal chip model number for KA3525, and the bit number is U1, mainly used to produce two way PWM signal for driving push -pull circuit, the capacitor C1 is the oscillator timing capacitor, is connected with U1's 5th pin CT and GND respectively, and R2 is the oscillator timing resistance, is connected with U1's 6th pin and GND respectively, and R1 control dead zone's resistance, is connected with U1's 5th pin and 7th pin respectively, and C1, R1 and R2 commonly determine the oscillation frequency of oscillator, and the oscillation frequency f=1 / [(0.7R2+R1)*C1], and C2 is the capacitor of slow start setting, is connected with U1's 8th pin and GND respectively, and U1's 12th pin is ground pin, and 15th pin is power supply pin, and a filter capacitor C4 is connected between power supply and GND, in the utility model, power supply pin connects 12V power supply, and the 12V power supply is generated by auxiliary power supply circuit, and U1's 13th pin is output stage bias voltage input end, and is connected with 12V, and U1's 16th pin is the 5.1V reference voltage VREF of chip output, and a filter capacitor C3 is connected between 16th pin and GND, and 10th pin is shutdown pin, and is external shutdown signal input end, when this end is connected with high level, the output of U1 is forbidden, in the scheme, the pin is connected with the CPU of control module, and CPU will output high level to U1 when the circuit needs protection, and U1's 11th pin and 14th pin are two drive outputs OUTA and OUTB respectively, and output a pair of high low level complementary signals to push -pull circuit, the push -pull circuit is composed of two groups of identical circuits, and taking the first group as an example, and each push -pull circuit is composed of a resistance R5, an NPN triode Q1 and a PNP triode Q2, and one end of R5 is connected with the drive output OUTA of pulse width modulation signal generation circuit, and the other end is connected with the base of Q1 and Q2, and the collector of Q1 is connected with 12V power supply, and the emitter of Q2 is connected with GND, and the emitter of Q1 and Q2 is connected as the output of push -pull circuit, when OUTA is high (12V), Q1 is turned on, and Q2 is cut off, and the push -pull circuit outputs high level, and conversely when OUTA is low (0V), Q1 is cut off, and Q2 is turned on, and the push -pull circuit outputs low level, since OUTA and OUTB are a pair of high low level complementary signals, so the output signals of two push -pull circuits also have complementary relationship, and send to switch switching circuit.The switch switching circuit comprises R6-R9, R11-R14, and Q3, Q4, Q7, Q8, wherein Q3, Q4, Q7, Q8 are N-channel enhancement mode MOS tubes, Q3 and Q4 are connected in parallel, and Q7 and Q8 are connected in parallel, and the parallel connection is for increasing working current; when OUTA outputs a high level, the push-pull circuit in which Q1 and Q2 are located outputs high, Q3 and Q4 are turned on, and Q7 and Q8 are cut off due to the complementary relationship between OUTA and OUTB; the boost circuit mainly comprises a transformer T1, the left side of the transformer T1 is a primary coil, the right side of the transformer T1 is a secondary coil, the center tap C of the primary coil is connected to the positive pole BAT+ of the battery, and the other two ends A and B are connected to two groups of switch switching circuits; when Q3 and Q4 are turned on and Q7 and Q8 are cut off, the current direction of the primary coil is from C to A; when Q3 and Q4 are cut off and Q7 and Q8 are turned on, the current direction of the primary coil is from C to B; in this way, the primary coil of the transformer generates an alternating magnetic field; according to the principle of electromagnetic induction, a direction-alternating induced voltage is generated between the secondary coil D and E; when the number of turns of the coil DE is higher than that of the coil AB, a high-voltage alternating current is generated between the two ends of DE; the voltage is subjected to a rectifier filter circuit to obtain a high-voltage direct current; the rectifier filter circuit comprises four diodes D1, D2, D3 and D4 and a capacitor C11; when the induced voltage between D and E is positive at D and negative at E, diodes D1 and D4 are turned on; when the induced voltage between D and E is negative at D and positive at E, diodes D2 and D3 are turned on; the auxiliary power supply circuit comprises a step-down circuit, a rectifier filter circuit and a voltage stabilizing circuit; the step-down circuit generates an alternating voltage by means of another inductive coil FG of the transformer; the alternating voltage is subjected to the rectifier filter circuit composed of D5, D6, D7, D8 and C7 to change the alternating current into a direct current; the voltage stabilizing circuit comprises 12V voltage stabilization, 5V voltage stabilization and 3.3V voltage stabilization, generates a more flat and smooth direct current signal, device 7812 generates a 12V power supply for the H-bridge of the front-stage circuit module and the rear-stage circuit module, device 7805 generates a 5V power supply for the half-bridge driving chip IR2110S, and TPS7A2033 generates a 3.3V power supply for the single-chip microcomputer and peripheral circuit of the control module; capacitors C8, C9, C10, C5 and C11 have the power filter effect and filter out useless noise signals.

[0009] As a preferred scheme of the utility model, the battery access module comprises a large-capacity battery (BAT), a fuse (F), a filter inductor (L) and a filter capacitor (C), the large-capacity battery selects a storage battery with a rated power of 3000W and a battery capacity of 1700WH, the battery output voltage is 48V, the rated current of the fuse is selected as 80A, the filter inductor L and the filter capacitor C constitute a filter circuit, and filter out the noise signal output by the battery, and the filter capacitor selects four capacitors with a capacitance of 4700uF and a voltage resistance of 63V to be connected in parallel.

[0010] As a preferred scheme of the utility model, the post-stage circuit module is mainly composed of SPWM controller circuit, H bridge circuit and filter circuit, the SPWM controller circuit is mainly composed of two half bridge drive chips IR2110S, including low frequency drive and high frequency drive, the 11th pin of IR2110S is connected with 5V power supply and is grounded through filter capacitor, the 3rd pin is connected with 12V power supply and is grounded through filter capacitor, SPWM1~SPWM4 signal is given by the CPU of the control module, SPWM1 and SPWM2 are a group of high-low level complementary square wave signals, the frequency is 23KHz, and respectively decides the output of HO1 and LO1, SPWM3 and SPWM4 are a group of high-low level complementary square wave signals, the frequency is 50Hz, and respectively decides the output of HO2 and LO2, the H bridge circuit is composed of four groups of IGBT circuits named A, B, C and D respectively, each group includes a diode D11, two resistors R16 and R17, an insulated gate bipolar transistor (IGBT for short) Q9, wherein the three terminals of IGBT are gate (G), collector (C) and emitter (E), the collectors of A and B two groups of IGBT are connected with the high-voltage direct-current signal HV+ after rectification filtering, the emitters of C and D two groups of IGBT are connected with the high-voltage direct-current signal ground PGND after rectification filtering, and the control signals (HO1, HO2, LO1 and LO2 respectively) of four groups of IGBT are generated by the SPWM controller circuit, taking A group as an example, when the control input signal HO1 is high level, the C and E poles of IGBT are turned on, the waveforms of four control signals HO1, HO2, LO1 and LO2 output by the SPWM controller can realize the output of different width waveforms, and the waveforms are filtered by the filter circuit to obtain 50Hz, 220V alternating current power supply for use in electrical equipment, the filter circuit is composed of two inductors L2 and L3, common mode inductor L4 and four capacitors C12, C13, C14 and C15, L2, L3 and C12 convert the square wave signal output by H bridge into sine wave, the common mode inductor L4 filters the common mode signal of two signals, and C13, C14 and C15 further filter to make the sine wave signal more smooth and stable.

[0011] As a preferred scheme of the utility model, the protection module comprises anti-reverse connection circuit, under-voltage protection circuit, over-voltage protection circuit and over-current protection circuit, the anti-reverse connection circuit prevents input voltage polarity from being connected reversely and causing circuit burnout, Q15 is an N-channel enhancement mode MOS tube, the gate (G) thereof is connected with the common terminal of resistor R26 and resistor R27, the source (S) thereof is connected with capacitor C24, the drain (D) thereof is connected with R27 and the negative electrode of battery, a diode is integrated between the source S and the drain D, and the direction points to D, when the battery polarity is not connected reversely, the diode integrated in Q15 is turned on, the voltage between the gate G and the drain D is the voltage divided on R27, and the voltage between the gate G and the source S is lower than the voltage on R27 by a diode voltage drop, as long as the resistance values of R26 and R27 are properly selected, the voltage between the gate G and the source S can reach the opening threshold of the MOS tube to make the MOS tube conduct, since the conduction resistance is very low, the voltage between the source S and the drain D is almost zero after conduction, and the circuit works normally, when the battery polarity is connected reversely, the diode integrated in Q15 is cut off due to reverse bias, the voltage between the gate G and the source S of Q15 is also cut off due to reverse bias, the inverter power supply cannot be started, and protection is achieved; the under-voltage protection circuit is a circuit for protecting the battery from over-discharge, which monitors the voltage of the battery, and when the voltage is lower than the set threshold, the load circuit of the battery is automatically cut off, thereby avoiding over-discharge of the battery and protecting the service life of the battery; the over-voltage protection circuit mainly comprises voltage dividing resistor R30 and R31, a comparator and a single-chip microcomputer, voltage dividing resistor R30 is connected with R31 and high voltage direct current HV+, the voltage dividing value of R31 is compared with the set threshold of the comparator, when the voltage dividing value is higher than the set threshold, the output state of the comparator is reversed, and the signal is sent to the single-chip microcomputer, and the single-chip microcomputer is responsible for controlling the shutdown of the inverter power supply; the over-current protection circuit comprises current sampling circuit, double threshold value comparison circuit and software protection circuit, the current sampling circuit can convert the current into voltage through resistance sampling and send the voltage into the double threshold value comparison circuit, or can sample through current transformer and convert into voltage and send into the double threshold value comparison circuit, the double threshold value comparison circuit is composed of two groups of comparators U5 and U6, threshold value one set by the comparator U5 is relatively high, and is mainly set for protecting the use equipment in the case that there is transient large current during starting moment or working process, threshold value two set by the comparator U6 is relatively low, and is mainly set for protecting the use equipment in the case that there is continuous large current during stable working, the circuit composed of the comparator U5 and the comparator U6 is hardware protection, that is, as long as the voltage signal output by the sampling circuit exceeds the corresponding set threshold value, the comparator will output signal reversal signal, and the software protection circuit is mainly composed of a single-chip microcomputer, can protect for different time according to the triggering of different threshold values, and the delay time can be set and modified through software.

[0012] As a preferred scheme of the utility model, the heat dissipation module comprises temperature sampling circuit, PWM fan and single-chip microcomputer circuit, the temperature sampling circuit is composed of resistance R35 and thermistor RT1 in series, the resistance value of thermistor RT1 changes with temperature change, and then the voltage value divided on RT1 also changes, the voltage value divided by temperature sampling circuit on RT1 is sent to the single-chip microcomputer circuit, the single-chip microcomputer circuit is also connected with the 4th pin and the 3rd pin of PWM fan through PWM control pin and speed monitoring pin TACH respectively, the 2nd pin of PWM fan is connected with 12V power supply, and the 1st pin is connected with GND, the 4th pin of PWM fan is fan speed control pin, and input signal is square wave signal, when the single-chip microcomputer circuit outputs PWM signal of different duty cycles, the fan can rotate at different speeds, and the speed signal is output through the 3rd pin of PWM fan, the speed signal is a square wave signal, different frequencies correspond to different speeds, and the single-chip microcomputer can obtain the working state of the fan by calculating the speed signal frequency output by the fan, the thermistor RT1 is installed on the heat dissipation fin of the inverter power supply, and the heat dissipation fin is fixed by being closely attached to IGBT and high-power MOS tube through high-thermal-conductivity rubber pad, so that the heat generated in the working process of the inverter power supply can be promptly dissipated to air.

[0013] As a preferred scheme of the utility model, the control module mainly plays signal monitoring and signal control functions, and is mainly composed of STM32 single-chip microcomputer circuit, the STM32 single-chip microcomputer is powered by 3.3V, and is responsible for receiving temperature monitoring circuit signal, under-voltage protection signal, over-voltage protection signal, over-current protection signal and PWM fan speed signal when being used as a signal monitoring function, and is connected with chip KA3525 of pulse width modulation signal generation circuit when being used as a signal control function, is responsible for outputting shutdown signal to KA3525, the STM32 single-chip microcomputer is connected with low-frequency drive chip IR2110S (U3), is responsible for outputting SPWM1 and SPWM2 signals, and then controls low-frequency arm output signals HO1 and LO1, is connected with high-frequency drive chip IR2110S (U4), is responsible for outputting SPWM3 and SPWM4 signals, and then controls high-frequency arm output signals HO2 and LO2, the STM32 single-chip microcomputer is also connected with comparator outputs of under-voltage protection, over-voltage protection and over-current protection circuit, and is responsible for monitoring voltage and current states of the circuit in real time, the STM32 single-chip microcomputer is also connected with the heat dissipation module, is connected with the output of temperature monitoring circuit on one hand, monitors the temperature of the heat dissipation fin in real time, is connected with the PWM fan on the other hand, controls and monitors the running state of the fan, and the STM32 single-chip microcomputer is also connected with the state display module, controls the output of light indication, sound indication and display screen.

[0014] As a preferred scheme of the utility model, the state display module includes light indicating circuit, sound indicating circuit and display screen, the light indicating circuit includes resistance R36, resistance R37, emitting diode D20, NPN triode Q16, resistance R36 is connected with the base of control signal LED1 and Q16 respectively, R37 is connected with the emitter of Q16 and GND respectively, D20 is connected with the collector of Q16 and 12V power supply respectively, the control signal LED1 is given by control module, Q16 is turned on when LED1 signal is high level, then diode D20 is turned on, diode emits light, through the state of control LED1 signal, diode can realize bright, off, flicker and other functions, for indicating the working state of inverter power supply;The sound indicating circuit includes resistance R38, resistance R39, diode D21, NPN triode Q17, buzzer B1, one end of resistance R38 is connected with control signal BEEP1, the other end is connected with the base of Q17 and R39, the other end of R39 and the emitter of Q17 are connected with GND, one end of buzzer B1 is connected with 5V power supply and the cathode of diode D21, the other end is connected with the collector of Q17 and the anode of diode D21, the control signal BEEP1 is given by control module, Q17 is turned on when BEEP1 signal is high level, then buzzer B1 is turned on, buzzer emits sound, through the state of control BEEP1 signal, whether the buzzer emits sound is controlled, often when the circuit has abnormal state, the buzzer is controlled to emit sound, causing the user's attention;The display screen mainly displays the working state of circuit, including battery voltage, output voltage, load power and other state quantities, plays the role of intuitive display.

[0015] The utility model discloses a beneficial effect: the utility model mainly solves the contradiction that current inverter power supply can not be compatible with starting impact load and guaranteeing long -time work under high -power,

[0016] Optimize the anti-reverse connection circuit, avoid the problem that the fuse is burnt by the conventional circuit using the Schottky diode scheme, and the problem that the service life is short due to mechanical contact problems caused by the relay protection circuit;

[0017] Optimize the under-voltage protection and over-current protection scheme to avoid the problem of unstable work caused by false protection when using impact loads such as motors;

[0018] Adopt the PWM fan control strategy, control the air volume according to different temperatures, achieve the purpose of energy saving and environmental protection and reduce noise. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is the schematic diagram of the existing anti-reverse connection circuit one;

[0020] Figure 2 It is the schematic diagram of the existing anti-reverse connection circuit two;

[0021] Figure 3 The utility model discloses a battery access module schematic diagram;

[0022] Figure 4 The utility model discloses a front stage circuit module composition schematic diagram.

[0023] Figure 5 The utility model discloses a front stage circuit module circuit form schematic diagram;

[0024] Figure 6 The utility model discloses a pulse width modulation signal generation circuit schematic diagram;

[0025] Figure 7 The utility model discloses a push-pull circuit schematic diagram;

[0026] Figure 8 The utility model discloses a switch circuit, boost circuit and rectification filter circuit schematic diagram;

[0027] Figure 9 The utility model discloses an auxiliary power supply circuit schematic diagram;

[0028] Figure 10 The utility model discloses a SPWM controller circuit schematic diagram;

[0029] Figure 11 The utility model discloses a H bridge drive circuit and filter circuit schematic diagram;

[0030] Figure 12 The utility model discloses a reverse connection prevention circuit schematic diagram;

[0031] Figure 13 The utility model discloses a battery undervoltage protection circuit schematic diagram;

[0032] Figure 14 The utility model discloses an overvoltage protection circuit schematic diagram;

[0033] Figure 15 The utility model discloses an overcurrent protection circuit schematic diagram;

[0034] Figure 16 The utility model discloses a heat dissipation module schematic diagram;

[0035] Figure 17 The utility model discloses a light indication circuit schematic diagram;

[0036] Figure 18 The utility model discloses a sound indication circuit schematic diagram;

[0037] Figure 19 The utility model discloses a control module schematic diagram. DETAILED DESCRIPTION

[0038] Embodiment 1

[0039] As Figures 3-4 shown, the utility model discloses a novel high -power inverter power supply adopts the technical scheme is including battery access module, former stage circuit module, after stage circuit module, protection module, heat dissipation module, control module, state display module, the former stage circuit module mainly includes pulse width modulation signal generation circuit, push -pull circuit, switch switching circuit, boost circuit, rectifier filter circuit, auxiliary power supply circuit.

[0040] As Figure 6 shown, the pulse width modulation signal generation circuit adopts the pulse width modulation signal chip model number for KA3525, and the bit number is U1, mainly used to produce two road PWM signal, for driving push -pull circuit, the capacitor C1 is the oscillator timing capacitor, is connected with U1's 5th pin CT and GND respectively, and R2 is the oscillator timing resistance, is connected with U1's 6th pin and GND respectively, and R1 control dead zone's resistance, is connected with U1's 5th pin and 7th pin respectively, and C1, R1 and R2 commonly determine the oscillation frequency of oscillator, and oscillation frequency f=1 / [(0.7R2+R1) *C1], and C2 is the capacitor of slow start setting, is connected with U1's 8th pin and GND respectively, and U1's 12th pin is ground pin, and 15th pin is power supply pin, and a filter capacitor C4 is connected between power supply and GND, and in the utility model, power supply pin connects 12V power supply, and the 12V power supply is produced by auxiliary power supply circuit, and U1's 13th pin is output stage bias voltage input end, and access 12V, and U1's 16th pin is the 5.1V reference voltage VREF of chip output, and 16 pin is connected with a filter capacitor C3 between GND, and 10th pin is shutdown pin, and is the external shutdown signal input end, when this end connects high level, the output of U1 is forbidden, in the scheme, the pin is connected with the CPU of control module, and when the circuit needs protection, CPU will output high level to U1, and U1's 11th pin and 14th pin are two drive outputs OUTA and OUTB respectively, and output a pair of high low level complementary signals to push -pull circuit.

[0041] As Figure 7As shown, the push-pull circuit consists of two sets of identical circuit, taking the first group as an example, each push-pull circuit consists of a resistor R5, a NPN transistor Q1, a PNP transistor Q2, R5 one end of the pulse width modulation signal generation circuit drive output OUTA, the other end of Q1 and Q2 base, Q1 collector connected 12V power supply, Q2 emitter GND, Q1 and Q2 emitter connected as the output of the push-pull circuit, when OUTA is high (12V), Q1 is on, Q2 is off, the output of the push-pull circuit high, otherwise when OUTA is low (0V), Q1 is off, Q2 is on, the output of the push-pull circuit low, since OUTA and OUTB is a pair of high and low complementary signals, so the output signal of the two push-pull circuit also complementary relationship, and sent to the switch switching circuit.

[0042] As shown in Figure 8 , the switch switching circuit includes R6-R9, R11-R14, and Q3, Q4, Q7, Q8, wherein Q3, Q4, Q7, Q8 are N-channel enhancement mode MOS tube, Q3 and Q4 are connected in parallel, Q7 and Q8 are connected in parallel, and the parallel connection is to increase the working current. When OUTA outputs high level, the push-pull circuit output high where Q1 and Q2 are located, Q3 and Q4 are turned on, and at the same time, Q7 and Q8 are turned off due to the complementary relationship between OUTA and OUTB.

[0043] As shown in Figure 8 , the boost circuit mainly consists of transformer T1, the left side is the primary coil, and the right side is the secondary coil. The center tap C of the primary coil is connected to the positive electrode BAT+ of the battery. The other two ends A and B are connected to two groups of switch switching circuits. When Q3 and Q4 are turned on and Q7 and Q8 are turned off, the current direction of the primary coil is from C to A. When Q3 and Q4 are turned off and Q7 and Q8 are turned on, the current direction of the primary coil is from C to B. In this way, the primary coil of the transformer generates an alternating magnetic field. According to the principle of electromagnetic induction, a directionally alternating induced voltage is generated between the secondary coil D and E. When the number of turns of coil DE is higher than that of coil AB, a high-voltage alternating current is generated between DE. After the voltage passes through the rectifier filter circuit, a high-voltage direct current is obtained.

[0044] As shown in Figure 8 , the rectifier filter circuit consists of four diodes D1, D2, D3, D4 and a capacitor C11. When the induced voltage between D and E is positive at D and negative at E, diodes D1 and D4 are turned on. When the induced voltage between D and E is negative at D and positive at E, diodes D2 and D3 are turned on. In this way, no matter what the voltage polarity is at D and E, a direct current voltage with positive on top and negative on bottom can be generated on C11. The function of C11 is to filter out the high-frequency components of the direct current, obtaining a smoother voltage signal.

[0045] AsFigure 9 As shown, the auxiliary power supply circuit includes a step-down circuit, a rectifier filter circuit, a voltage stabilizing circuit, the step-down circuit generates AC voltage by another inductor FG of the transformer, the AC voltage is converted into DC voltage by the rectifier filter circuit composed of D5, D6, D7, D8 and C7, the voltage stabilizing circuit includes 12V voltage stabilizing, 5V voltage stabilizing and 3.3V voltage stabilizing, generates more flat and smooth DC signal, device 7812 generates 12V power supply for the H-bridge of the front-stage circuit module and the rear-stage circuit module, 7805 generates 5V power supply for the half-bridge driving chip IR2110S, TPS7A2033 generates 3.3V power supply for the single-chip microcomputer and peripheral circuit of the control module, capacitors C8, C9, C10, C5 and C11 have power filter function and filter out useless noise signal.

[0046] As shown in the figure, Figure 3 As shown, the battery access module includes a large-capacity battery (BAT), a fuse (F), a filter inductor (L) and a filter capacitor (C), the large-capacity battery selects an energy storage battery with rated power of 3000W and battery capacity of 1700WH, the battery output voltage is 48V, the rated current of the fuse is selected as 80A, the filter inductor L and the filter capacitor C constitute a filter circuit to filter out noise signal of the battery output, the filter capacitor selects four capacitors with 4700uF and 63V voltage resistance connected in parallel.

[0047] As shown in the figure, Figures 10-11As shown, the post-stage circuit module is mainly composed of an SPWM controller circuit, an H-bridge circuit and a filter circuit, the SPWM controller circuit is mainly composed of two half-bridge driving chips IR2110S, including low-frequency driving and high-frequency driving, the 11th pin of IR2110S is connected with a 5V power supply and grounded through a filter capacitor, the 3rd pin is connected with a 12V power supply and grounded through a filter capacitor, SPWM1-SPWM4 signals are given by the CPU of the control module, SPWM1 and SPWM2 are a group of high-low level complementary square wave signals with a frequency of 23KHz, respectively determining the output of HO1 and LO1, SPWM3 and SPWM4 are a group of high-low level complementary square wave signals with a frequency of 50Hz, respectively determining the output of HO2 and LO2; the H-bridge circuit is composed of four groups of IGBT circuits named A, B, C and D respectively, each group includes a diode D11, two resistors R16 and R17, and an insulated gate bipolar transistor (IGBT) Q9, wherein the three terminals of the IGBT are gate (G), collector (C) and emitter (E), the collectors of the A and B groups of IGBTs are connected with a rectified and filtered high-voltage direct current signal HV+, the emitters of the C and D groups of IGBTs are connected with a rectified and filtered high-voltage direct current signal ground PGND, and the control signals (HO1, HO2, LO1 and LO2) of the four groups of IGBTs are generated by the SPWM controller circuit, for example, when the control input signal HO1 is high, the C and E terminals of the IGBT are turned on, and through the waveforms of the four control signals HO1, HO2, LO1 and LO2 output by the SPWM controller, different width waveforms can be realized, and the waveforms are filtered by the filter circuit to obtain a 50Hz, 220V alternating current power supply for use by electrical equipment; the filter circuit is composed of two inductors L2 and L3, a common-mode inductor L4, and four capacitors C12, C13, C14 and C15, L2, L3 and C12 convert the square wave signal output by the H-bridge into a sine wave, the common-mode inductor L4 filters out the common-mode signal of the two signals, and C13, C14 and C15 further filter to make the sine wave signal smoother and more stable.

[0048] As Figures 12-15As shown, the protection module includes reverse connection prevention circuit, under-voltage protection circuit, over-voltage protection circuit, over-current protection circuit, the reverse connection prevention circuit is to prevent the input voltage polarity from being reversed to cause the circuit to burn out, Q15 is an N-channel enhancement mode MOS tube, the gate (G) thereof is connected with the common end of resistor R26 and resistor R27, the source (S) thereof is connected with capacitor C24, the drain (D) thereof is connected with R27 and the negative electrode of the battery, a diode is integrated between the source S and the drain D, and the direction points to D, when the battery polarity is not reversed, the diode integrated in Q15 is turned on, the voltage between the gate G and the drain D is the voltage divided on R27, the voltage between the gate G and the source S is lower than the voltage on R27 by a diode voltage drop, as long as the resistance values of R26 and R27 are properly selected, the voltage between the gate G and the source S can reach the opening threshold of the MOS tube to make the MOS tube conduct, since the conduction resistance is very low, the voltage between the source S and the drain D is almost zero after conduction, and the circuit works normally, when the battery polarity is reversed, the diode integrated in Q15 is cut off due to reverse bias, the voltage between the gate G and the source S of Q15 is also cut off due to reverse bias, the inverter power supply cannot be started, and the protection function is achieved, thus the situation that the fuse is burned out when the battery polarity is reversed in the existing reverse connection prevention circuit one shown in the figure, and the problem of the relay contact life in the existing reverse connection prevention circuit two shown in the figure will not occur Figure 1 , and the problem of the relay contact life in the existing reverse connection prevention circuit two shown in the figure will not occur Figure 2 The under-voltage protection circuit is a circuit for protecting the battery from over-discharge, which automatically cuts off the load circuit of the battery when the voltage is lower than the set threshold, so as to avoid over-discharge of the battery and protect the service life of the battery, the conventional battery under-voltage protection circuit is often composed of a simple resistance dividing circuit and a comparator, the disadvantage of this scheme is that it is easy to cause under-voltage protection and cannot start such loads when facing starting impact loads, which is particularly obvious when the battery power is not very sufficient, in order to solve this problem, a diode and a capacitor are added in the design of the battery under-voltage protection circuit, and intelligent judgment is made through a single-chip microcomputer, as shown in the attached Figure 13The battery under-voltage protection circuit is composed of diode D19, capacitor C25, voltage dividing resistors R28 and R29, a comparator, and a single-chip microcomputer. The voltage divided on R29 is sent to the comparator. When the voltage is lower than the threshold value set by the comparator, the comparator output signal will be reversed, and the reversed signal is sent to the single-chip microcomputer, which controls the shutdown of the inverter power supply. When the battery is started with an impact load or when the power consumption device has a transient high power, the battery voltage will drop for a short time. However, due to the unidirectional conductivity of diode D19 and the energy storage characteristics of capacitor C25, the monitored voltage will not immediately drop, i.e., a delay protection function is achieved. When the impact load is started and the battery voltage is restored, the battery sampling voltage can be quickly established due to the unidirectional conductivity of the diode. On the one hand, the hardware delay circuit avoids the comparator from giving a reversed signal during the impact load starting moment. On the other hand, the single-chip microcomputer is used for software delay. After receiving the reversed signal from the comparator, the single-chip microcomputer delays for a certain time before performing the shutdown action. The over-voltage protection circuit is mainly composed of voltage dividing resistors R30 and R31, a comparator, and a single-chip microcomputer. Voltage dividing resistor R30 is connected to R31 and high-voltage direct current HV+. The voltage dividing value of R31 is compared with the threshold value set by the comparator. When the voltage dividing value is higher than the threshold value, the output state of the comparator is reversed, and the signal is sent to the single-chip microcomputer, which controls the shutdown of the inverter power supply. The over-current protection circuit includes a current sampling circuit, a double-threshold value comparison circuit, and a software protection circuit. The current sampling circuit can convert the current into a voltage signal sent to the double-threshold value comparison circuit through resistance sampling or through a current transformer. The double-threshold value comparison circuit is composed of two comparators U5 and U6. The threshold value one of comparator U5 is set relatively high, mainly for protection when the power consumption device has a transient high current during the starting moment or during the working process. The threshold value two of comparator U6 is set relatively low, mainly for protection when the power consumption device continuously generates a high current during the stable working process. The circuit composed of comparator U5 and comparator U6 is a hardware protection circuit. As long as the voltage signal output by the sampling circuit exceeds the corresponding set threshold value, the comparator will output a reversed signal. The software protection circuit is mainly composed of a single-chip microcomputer. The single-chip microcomputer can delay for different times for protection according to the triggering of different threshold values. The delay time can be set and modified through software.

[0049] As Figure 16As shown, the heat dissipation module includes temperature sampling circuit, PWM fan and single-chip microcomputer circuit, the temperature sampling circuit is composed of resistance R35 and thermistor RT1 in series, the resistance value of thermistor RT1 changes with temperature, and the voltage value of RT1 also changes, the temperature sampling circuit sends the voltage value of RT1 to the single-chip microcomputer circuit, the single-chip microcomputer circuit is connected with the fourth pin and the third pin of the PWM fan through PWM control pin and speed monitoring pin TACH respectively, the second pin of the PWM fan is connected with 12V power supply, and the first pin is connected with GND, the fourth pin of the PWM fan is the fan speed control pin, the input signal is a square wave signal, when the single-chip microcomputer circuit outputs PWM signals with different duty cycles, the fan can rotate at different speeds, and the speed signal is output through the third pin of the PWM fan, the speed signal is a square wave signal, different frequencies correspond to different speeds, the single-chip microcomputer calculates the frequency of the speed signal output by the fan, and the working state of the fan can be obtained, the thermistor RT1 is installed on the heat sink of the inverter power supply, the heat sink is fixed to the IGBT and the high-power MOS tube through the high-thermal-conductivity rubber pad, and the heat generated by the inverter power supply during the working process is dissipated to the air in time.

[0050] As shown in Figure 19 As shown, the control module mainly plays a signal monitoring and signal control function, and is mainly composed of an STM32 single-chip microcomputer circuit, the STM32 single-chip microcomputer is powered by 3.3V, and is responsible for receiving temperature monitoring circuit signals, under-voltage protection signals, over-voltage protection signals, over-current protection signals and PWM fan speed signals when used as a signal monitoring function, and is connected with a pulse width modulation signal generation circuit chip KA3525 when used as a signal control function, and is responsible for outputting an SD (shutdown) signal to the KA3525, the STM32 single-chip microcomputer is connected with a low-frequency drive chip IR2110S (U3), and is responsible for outputting SPWM1 and SPWM2 signals, and then controls low-frequency arm output signals HO1 and LO1, and is connected with a high-frequency drive chip IR2110S (U4), and is responsible for outputting SPWM3 and SPWM4 signals, and then controls high-frequency arm output signals HO2 and LO2, the STM32 single-chip microcomputer is also connected with comparator outputs of under-voltage protection, over-voltage protection and over-current protection circuits, and monitors the voltage and current states of the circuit in real time, the STM32 single-chip microcomputer is also connected with the heat dissipation module, and on one hand receives the output of the temperature monitoring circuit to monitor the temperature of the heat sink in real time, and on the other hand is connected with the PWM fan to control and monitor the running state of the fan, the STM32 single-chip microcomputer is also connected with the state display module to control the output of light indication, sound indication and display screen.

[0051] As shown in Figures 17-18As shown, the state display module includes light indicating circuit, sound indicating circuit and display screen, the light indicating circuit includes resistance R36, resistance R37, light emitting diode D20, NPN triode Q16, resistance R36 is connected with control signal LED1 and the base of Q16 respectively, R37 is connected with GND and the emitter of Q16 respectively, D20 is connected with 12V power supply and the collector of Q16 respectively, the control signal LED1 is given by control module, Q16 is turned on when LED1 signal is high level, then diode D20 is turned on, diode emits light, through the state of control LED1 signal, diode can realize bright, off, flicker and other functions, for indicating the working state of inverter power supply;The sound indicating circuit includes resistance R38, resistance R39, diode D21, NPN triode Q17, buzzer B1, one end of resistance R38 is connected with control signal BEEP1, the other end is connected with the base of Q17 and R39, the other end of R39 and the emitter of Q17 are connected with GND, one end of buzzer B1 is connected with 5V power supply and the cathode of diode D21, the other end is connected with the collector of Q17 and the anode of diode D21, the control signal BEEP1 is given by control module, Q17 is turned on when BEEP1 signal is high level, then buzzer B1 is turned on, buzzer emits sound, through the state of control BEEP1 signal, whether the buzzer emits sound is controlled, often when the circuit has abnormal state, the buzzer emits sound, causes the attention of user;The display screen mainly displays the working state of circuit, including battery voltage, output voltage, load power and other state quantities, plays the role of intuitive display.

[0052] The electrical connection mode or structure not described in detail in the present application is prior art.

[0053] Although the specific embodiments of the present application have been described in detail above, the present application is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present application, and modifications or deformations without creative labor are still within the protection scope of the present application.

Claims

1. A novel high-power inverter power supply, characterized by: The battery access module, the front-stage circuit module, the rear-stage circuit module, the protection module, the heat dissipation module, the control module and the state display module are included, and the front-stage circuit module mainly includes a pulse width modulation signal generation circuit, a push-pull circuit, a switch switching circuit, a voltage boosting circuit, a rectification filtering circuit and an auxiliary power supply circuit. The pulse width modulation signal chip model of the pulse width modulation signal generation circuit is KA3525, and the bit number is U1. The pulse width modulation signal generation circuit is mainly used to generate two PWM signals for driving the push-pull circuit. The capacitor C1 is an oscillator timing capacitor, and is connected to the 5th pin CT and the GND of U1 respectively. R2 is an oscillator timing resistor, and is connected to the 6th pin and the GND of U1 respectively. R1 is a resistance for controlling the dead zone, and is connected to the 5th pin and the 7th pin of U1 respectively. C1, R1 and R2 jointly determine the oscillation frequency of the oscillator, and the oscillation frequency f = 1 / [(0.7R2 + R1) * C1]. C2 is a slow start setting capacitor, and is connected to the 8th pin and the GND of U1 respectively. The 12th pin of U1 is a ground pin, and the 15th pin is a power supply pin. A filtering capacitor C4 is connected between the power supply and the GND. In the circuit, the 12V power supply is connected to the power supply pin. The 12V power supply is generated by the auxiliary power supply circuit. The 13th pin of U1 is an output stage bias voltage input end, and is connected to 12V. The 16th pin of U1 is a 5.1V reference voltage VREF output by the chip. A filtering capacitor C3 is connected between the 16th pin and the GND. The 10th pin is a shutdown pin, which is an external shutdown signal input end. When the end is connected to a high level, the output of U1 is prohibited. In the scheme, the pin is connected to the CPU of the control module. When the circuit needs to be protected, the CPU outputs a high level to U1. The 11th pin and the 14th pin of U1 are two drive outputs OUTA and OUTB respectively, and output a pair of high-low complementary signals to the push-pull circuit. The push-pull circuit is composed of two groups of identical circuits. Taking the first group as an example, each push-pull circuit is composed of a resistor R5, an NPN transistor Q1 and a PNP transistor Q2. One end of R5 is connected to the drive output OUTA of the pulse width modulation signal generation circuit, and the other end is connected to the bases of Q1 and Q2. The collector of Q1 is connected to the 12V power supply, and the emitter of Q2 is connected to the ground. The emitters of Q1 and Q2 are connected to each other as the output of the push-pull circuit. When OUTA is high (12V), Q1 is turned on and Q2 is turned off, and the push-pull circuit outputs a high level. Conversely, when OUTA is low (0V), Q1 is turned off and Q2 is turned on, and the push-pull circuit outputs a low level. Since OUTA and OUTB are a pair of high-low complementary signals, the output signals of the two push-pull circuits also have a complementary relationship, and are sent to the switch switching circuit. The switch switching circuit comprises R6-R9, R11-R14, and Q3, Q4, Q7, Q8, wherein Q3, Q4, Q7, and Q8 are N-channel enhancement mode MOS tubes, Q3 and Q4 are connected in parallel, and Q7 and Q8 are connected in parallel, and the parallel connection is for increasing working current; when OUTA outputs a high level, the push-pull circuit in which Q1 and Q2 are located outputs high, Q3 and Q4 are turned on, and Q7 and Q8 are cut off due to the complementary relationship between OUTA and OUTB; The boost circuit mainly comprises a transformer T1, the left side of which is a primary coil, and the right side is a secondary coil; the center tap C of the primary coil is connected to the positive electrode BAT+ of the battery; and the other two ends A and B are connected to two groups of switch switching circuits; when Q3 and Q4 are turned on and Q7 and Q8 are cut off, the current direction of the primary coil is from C to A; when Q3 and Q4 are cut off and Q7 and Q8 are turned on, the current direction of the primary coil is from C to B; and the primary coil of the transformer generates an alternating magnetic field in this way; according to the principle of electromagnetic induction, a direction-alternating induced voltage is generated between the secondary coils D and E; when the number of turns of the coil DE is higher than that of the coil AB, a high-voltage alternating current is generated between the two ends of DE; and the voltage is rectified and filtered to obtain a high-voltage direct current. The rectification and filtering circuit comprises four diodes D1, D2, D3, and D4 and a capacitor C11; when the induced voltage between D and E is positive at D and negative at E, diodes D1 and D4 are turned on; and when the induced voltage between D and E is negative at D and positive at E, diodes D2 and D3 are turned on. The auxiliary power supply circuit comprises a step-down circuit, a rectification and filtering circuit, and a voltage stabilizing circuit; the step-down circuit generates an alternating voltage from another inductive coil FG of the transformer; the alternating voltage is converted into a direct current through the rectification and filtering circuit comprising D5, D6, D7, D8, and C7; the voltage stabilizing circuit comprises 12V voltage stabilization, 5V voltage stabilization, and 3.3V voltage stabilization, generates a more flat and smooth direct current signal, device 7812 generates a 12V power supply for the H-bridge of the front-stage circuit module and the rear-stage circuit module, device 7805 generates a 5V power supply for the half-bridge driving chip IR2110S, and TPS7A2033 generates a 3.3V power supply for the single-chip microcomputer and peripheral circuit of the control module; capacitors C8, C9, C10, C5, and C11 have a power filtering effect and filter out useless noise signals.

2. A novel high-power inverter power supply according to claim 1, characterized in that: The battery access module comprises a large-capacity battery (BAT), a fuse (F), a filter inductor (L), and a filter capacitor (C); the large-capacity battery is selected to be a storage battery with a rated power of 3000W and a battery capacity of 1700WH, and the battery output voltage is 48V; the rated current of the fuse is selected to be 80A; the filter inductor L and the filter capacitor C form a filter circuit to filter out noise signals output by the battery; and the filter capacitor is selected to be four capacitors with a capacitance of 4700uF and a voltage resistance of 63V connected in parallel.

3. A novel high-power inverter power supply according to claim 1, characterized in that: The post-stage circuit module is mainly composed of an SPWM controller circuit, an H-bridge circuit and a filter circuit. The SPWM controller circuit is mainly composed of two half-bridge driving chips IR2110S, including low-frequency driving and high-frequency driving. The 11th pin of the IR2110S is connected to a 5V power supply and grounded through a filter capacitor, the 3rd pin is connected to a 12V power supply and grounded through a filter capacitor, SPWM1-SPWM4 signals are given by the CPU of the control module, SPWM1 and SPWM2 are a group of high-low complementary square wave signals with a frequency of 23KHz, which respectively determine the output of HO1 and LO1, SPWM3 and SPWM4 are a group of high-low complementary square wave signals with a frequency of 50Hz, which respectively determine the output of HO2 and LO2; the H-bridge circuit is composed of four groups of IGBT circuits named A, B, C and D respectively, each group includes a diode D11, two resistors R16 and R17, and an insulated gate bipolar transistor Q9, wherein the three terminals of the IGBT are gate (G), collector (C) and emitter (E), the collectors of the A and B groups of IGBTs are connected to the high-voltage direct-current signal HV+ after rectification and filtering, the emitters of the C and D groups of IGBTs are connected to the high-voltage direct-current signal ground PGND after rectification and filtering, and the control signals of the four groups of IGBTs are generated by the SPWM controller circuit. Taking the A group as an example, when the control input signal HO1 is high, the C and E electrodes of the IGBT are turned on, and the waveforms of the four control signals HO1, HO2, LO1 and LO2 output by the SPWM controller are used to realize output of different width waveforms. The waveforms are filtered by the filter circuit to obtain a 50Hz, 220V alternating current power supply for use in electrical equipment; the filter circuit is composed of two inductors L2 and L3, a common-mode inductor L4, and four capacitors C12, C13, C14 and C15. L2, L3 and C12 convert the square wave signal output by the H-bridge into a sine wave, the common-mode inductor L4 filters out the common-mode signal of the two signals, and C13, C14 and C15 further filter to make the sine wave signal smoother and more stable.

4. A novel high-power inverter power supply according to claim 1, characterized in that: The protection module includes reverse connection prevention circuit, under-voltage protection circuit, over-voltage protection circuit and over-current protection circuit, the reverse connection prevention circuit prevents the circuit from being burnt due to reverse connection of input voltage, Q15 is an N-channel enhancement mode MOS tube, the gate (G) of which is connected with the common terminal of resistor R26 and resistor R27, the source (S) of which is connected with capacitor C24, the drain (D) of which is connected with R27 and the negative electrode of the battery, a diode is integrated between the source S and the drain D, pointing to D, when the battery polarity is not reversed, the internal integrated diode of Q15 is turned on, the voltage between the gate G and the drain D is the voltage divided on R27, the voltage between the gate G and the source S is lower than the voltage on R27 by a diode voltage drop, as long as the resistance values of R26 and R27 are properly selected, the voltage between the gate G and the source S reaches the turn-on threshold of the MOS tube to make the MOS tube conduct, since the on-resistance is very low, the voltage between the source S and the drain D is almost zero after conduction, and the circuit works normally, when the battery polarity is reversed, the internal integrated diode of Q15 is cut off due to reverse bias, the voltage between the gate G and the source S of Q15 is also cut off due to reverse bias, the inverter power supply cannot be started, and protection is achieved; the under-voltage protection circuit is a circuit for protecting the battery from over-discharge, which monitors the voltage of the battery, and when the voltage is lower than the set threshold, the load circuit of the battery is automatically cut off, thereby avoiding over-discharge of the battery and protecting the service life of the battery; the over-voltage protection circuit mainly consists of voltage dividing resistors R30 and R31, a comparator and a single-chip microcomputer, voltage dividing resistor R30 is connected with R31 and high voltage DC HV+, the voltage dividing value of R31 is compared with the set threshold of the comparator, when the voltage dividing value is higher than the set threshold, the output state of the comparator is reversed, and the signal is sent to the single-chip microcomputer, which is responsible for controlling the shutdown of the inverter power supply; The over-current protection circuit includes current sampling circuit, double threshold value comparison circuit and software protection circuit, the current sampling circuit converts the current into voltage through resistance sampling and sends it to the double threshold value comparison circuit, or samples through a current transformer and converts it into voltage and sends it to the double threshold value comparison circuit, the double threshold value comparison circuit is composed of two groups of comparators U5 and U6, the threshold value one of the comparator U5 is set higher, mainly for protection when the electrical equipment has a large instantaneous current during startup or working process, the threshold value two of the comparator U6 is set lower, mainly for protection when the electrical equipment continuously generates a large current during stable working, the circuit composed of the comparator U5 and the comparator U6 is a hardware protection, that is, as long as the voltage signal output by the sampling circuit exceeds the corresponding set threshold value, the comparator will output a signal reversal signal, the software protection circuit is mainly composed of a single-chip microcomputer, which can protect for different time delays according to the triggering of different threshold values, the delay time can be set and modified through software.

5. A novel high-power inverter power supply according to claim 1, characterized in that: The heat dissipation module comprises a temperature sampling circuit, a PWM fan and a single-chip microcomputer circuit, the temperature sampling circuit is composed of a resistor R35 and a thermistor RT1 in series, the resistance value of the thermistor RT1 changes with the change of temperature, and then the voltage value distributed on the RT1 also changes, the temperature sampling circuit sends the voltage value distributed on the RT1 to the single-chip microcomputer circuit, the single-chip microcomputer circuit is connected with the 4th pin and the 3rd pin of the PWM fan through a PWM control pin and a speed monitoring pin TACH respectively, the 2nd pin of the PWM fan is connected with a 12V power supply, and the 1st pin is connected with the ground, the 4th pin of the PWM fan is a fan speed control pin, and the input signal is a square wave signal, when the single-chip microcomputer circuit outputs PWM signals with different duty cycles, the fan rotates at different speeds, and at the same time, the speed signal is output through the 3rd pin of the PWM fan, the speed signal is a square wave signal, different frequencies correspond to different speeds, and the single-chip microcomputer obtains the working state of the fan by calculating the frequency of the speed signal output by the fan, the thermistor RT1 is mounted on the heat sink of the inverter power supply, the heat sink is fixed to the IGBT and the high-power MOS tube through a high-thermal-conductivity rubber pad, and the heat generated by the inverter power supply in the working process is dissipated to the air in time.

6. A novel high-power inverter power supply according to claim 1, characterized in that: The control module mainly plays a signal monitoring and signal control function, and is mainly composed of an STM32 single-chip microcomputer circuit, the STM32 single-chip microcomputer is powered by 3.3V, and is used as a signal monitoring function and is responsible for receiving temperature monitoring circuit signals, under-voltage protection signals, over-voltage protection signals, over-current protection signals and PWM fan speed signals, and is used as a signal control function and is connected with a chip KA3525 of a pulse width modulation signal generation circuit, and is responsible for outputting a shutdown signal to the KA3525, the STM32 single-chip microcomputer is connected with a low-frequency drive chip IR2110S (U3), is responsible for outputting SPWM1 and SPWM2 signals, and then controls low-frequency arm output signals HO1 and LO1, and is connected with a high-frequency drive chip IR2110S (U4), is responsible for outputting SPWM3 and SPWM4 signals, and then controls high-frequency arm output signals HO2 and LO2, the STM32 single-chip microcomputer is also connected with comparator outputs of under-voltage protection, over-voltage protection and over-current protection circuits, and monitors the voltage and current states of the circuit in real time, the STM32 single-chip microcomputer is also connected with the heat dissipation module, on one hand, receives the output of the temperature monitoring circuit and monitors the temperature of the heat sink in real time, and on the other hand, is connected with the PWM fan and controls and monitors the running state of the fan, and the STM32 single-chip microcomputer is also connected with a state display module and controls the output of light indication, sound indication and a display screen.

7. A novel high-power inverter power supply according to claim 1, characterized in that: The state display module comprises a light indication circuit, a sound indication circuit and a display screen. The light indication circuit comprises resistors R36 and R37, a light emitting diode D20 and an NPN transistor Q16. The resistor R36 is connected to a control signal LED1 and the base of the Q16, the resistor R37 is connected to GND and the emitter of the Q16, and the diode D20 is connected to a 12V power supply and the collector of the Q16. The control signal LED1 is given by the control module. When the LED1 signal is high, the Q16 is turned on, and then the diode D20 is turned on, and the diode emits light. By controlling the state of the LED1 signal, the diode realizes the functions of bright, off and flicker, and is used for indicating the working state of the inverter power supply. The sound indication circuit comprises resistors R38 and R39, a diode D21, an NPN transistor Q17 and a buzzer B1. One end of the resistor R38 is connected to a control signal BEEP1, and the other end is connected to the base of the Q17 and the resistor R39. The other end of the resistor R39 and the emitter of the Q17 are connected to GND. One end of the buzzer B1 is connected to a 5V power supply and the cathode of the diode D21, and the other end is connected to the collector of the Q17 and the anode of the diode D21. The control signal BEEP1 is given by the control module. When the BEEP1 signal is high, the Q17 is turned on, and then the buzzer B1 is turned on, and the buzzer emits sound. By controlling the state of the BEEP1 signal, whether the buzzer emits sound is controlled. Usually, when the circuit has an abnormal state, the buzzer is controlled to emit a sound, so as to attract the attention of the user. The display screen mainly displays the working state of the circuit, including the battery voltage, the output voltage, the load power state quantity, and plays a role of intuitive display.

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