Driving protection circuit and inverter

Abstract

The utility model relates to the technical field of power electronics, in particular to a driving protection circuit and an inverter, and the driving protection circuit comprises a sampling module, a first comparison module, a second comparison module and a driving module. According to the embodiment of the invention, a sampling module collects a current signal of an inverter circuit and converts the current signal into a voltage signal; when the voltage signal is greater than the first preset voltage, the first comparison module outputs a first control signal to the driving module; when the voltage signal is smaller than a second preset voltage, the second comparison module outputs a first control signal to the driving module; wherein the first preset voltage is greater than the second preset voltage; when the first control signal is received, the driving module locks the driving signal output to the switching tube at a low level, so that the switching tube stops working, the switching tube in the inverter circuit is turned off when the current signal in the inverter circuit is too large or too small, components in the circuit are protected from being damaged, and the safety of the circuit is improved.

Description

Technical Field

[0001] The present application relates to the field of power electronics technology, and in particular to a drive protection circuit and an inverter. Background Art

[0002] In recent years, energy storage bidirectional inverters are developing towards high frequency, high power density, small size, light weight and digitalization.

[0003] As the operating frequency of the switching converter continues to increase, two problems arise. First, the switch tube will generate very high di / dt (rate of change of current) and du / dt (rate of change of voltage), which will greatly increase the electromagnetic interference in the converter and affect the operation of surrounding electronic equipment. Second, the inductive turn-off voltage spike of the switch tube in the converter is large, and the sudden change of current will cause the inductive element to induce a voltage spike. The higher the switching frequency, the greater the voltage and current spikes, and the easier it is to damage the switching devices in the circuit. Utility Model Content

[0004] The embodiments of the present application provide a drive protection circuit and an inverter, which can stop the operation of the inverter circuit when the current in the inverter circuit is too large, thereby improving the safety of the circuit.

[0005] In a first aspect, an embodiment of the present application provides a driving protection circuit, comprising: a sampling module, a first comparison module, a second comparison module and a driving module; the sampling module is respectively connected to the first comparison module, the second comparison module and the inverter circuit, the first comparison module and the second comparison module are both connected to the driving module, and the driving module is connected to the switch tube of the inverter circuit; the sampling module is used to collect the current signal of the inverter circuit and convert the current signal into a voltage signal; the first comparison module is used to output a first control signal to the driving module when the voltage signal is greater than a first preset voltage; the second comparison module is used to output a first control signal to the driving module when the voltage signal is less than a second preset voltage; wherein the first preset voltage is greater than the second preset voltage; the driving module is used to lock the driving signal output to the switch tube to a low level when receiving the first control signal, so as to stop the switch tube from working.

[0006] In some embodiments, the driving module includes: a switching unit and a driving unit; the switching unit is respectively connected to the driving unit, the first comparison module, and the second comparison module, and the driving unit is connected to the switching tube of the inverter circuit; the switching unit is used to be turned on when receiving the first control signal to output a first level signal to the driving unit; the driving unit is used to lock the driving signal output to the switching tube to a low level when receiving the first level signal.

[0007] In some embodiments, the switch unit includes: a switch tube Q1, a resistor R15 and a resistor R21; the base of the switch tube Q1 is connected to the first comparison module and the second comparison module through the resistor R15, the first end of the resistor R21 is connected to the base of the switch tube Q1, the second end of the resistor R21 is grounded, the emitter of the switch tube Q1 is grounded, and the collector of the switch tube Q1 is connected to the driving unit.

[0008] In some embodiments, the driving unit includes: a resistor R7, a capacitor C8 and at least one driving sub-unit; the driving sub-unit includes: an AND gate U2A, a resistor R8, a resistor R9, a resistor R10, and a resistor R11; the first input end of the AND gate U2A is respectively connected to the second end of the resistor R7, the first end of the capacitor C8 and the switch unit, the first end of the resistor R7 is connected to the first power supply, the second end of the capacitor C8 is grounded, the second input end of the AND gate U2A is connected to the second end of the resistor R9, the first end of the resistor R9 is connected to the first end of the resistor R10 and the controller, the second end of the resistor R10 is grounded, the output end of the AND gate U2A is connected to the first end of the resistor R8 and the first end of the resistor R11, the second end of the resistor R11 is grounded, and the second end of the resistor R8 is connected to the switch tube of the inverter circuit.

[0009] In some embodiments, the first comparison module includes: a comparator U3A, a resistor R12, a resistor R14, a resistor R20, and a resistor R22; the non-inverting input terminal of the comparator U3A is connected to the second end of the resistor R14 and the first end of the resistor R20, the first end of the resistor R14 is connected to the sampling module, the second end of the resistor R20 is grounded, the inverting input terminal of the comparator U3A is connected to the second end of the resistor R12 and the first end of the resistor R22, the first end of the resistor R12 is connected to the first power supply, the second end of the resistor R22 is grounded, and the output terminal of the comparator U3A is connected to the driving module.

[0010] In some embodiments, the second comparison module includes: a comparator U3B, a resistor R27, and a resistor R29; the inverting input terminal of the comparator U3B is connected to the sampling module through the first comparison module, the non-inverting input terminal of the comparator U3B is connected to the second end of the resistor R27 and the first end of the resistor R29, the first end of the resistor R27 is connected to the first power supply, the second end of the resistor R29 is grounded, and the output terminal of the comparator U3B is connected to the driving module.

[0011] In some embodiments, the sampling module includes: an amplifier U1A, a resistor R1, a resistor R3, a resistor R5, a resistor R6, and a capacitor C6; the in-phase input terminal of the amplifier U1A is connected to the second end of the resistor R1 and the second end of the resistor R3, the first end of the resistor R1 is connected to the second power supply, the first end of the resistor R3 is connected to the inverter circuit, the inverting input terminal of the amplifier U1A is connected to the second end of the resistor R5, the first end of the resistor R6 and the first end of the capacitor C6, the first end of the resistor R5 is connected to the inverter circuit, and the output terminal of the amplifier U1A is connected to the second end of the resistor R6, the second end of the capacitor C6, the first comparison module and the second comparison module.

[0012] In some embodiments, the driving protection circuit further includes an anti-reverse module, the first comparison module is connected to the driving module through the anti-reverse module, and the second comparison module is connected to the driving module through the anti-reverse module.

[0013] In some embodiments, the anti-reverse module includes: a diode D1 and a diode D2; the anode of the diode D1 is connected to the first comparison module, the cathode of the diode D1 is connected to the driving module, the anode of the diode D2 is connected to the second comparison module, and the cathode of the diode D2 is connected to the driving module.

[0014] In the second aspect, an embodiment of the present application provides an inverter, comprising: an inverter circuit and a drive protection circuit as described above, wherein the inverter circuit is connected to the drive protection circuit; the drive protection circuit is used to collect the current signal of the inverter circuit and convert the current signal into a voltage signal, and when the voltage signal is greater than a first preset voltage, or when the voltage signal is less than a second preset voltage, the drive signal output to the switch tube of the inverter circuit is locked to a low level.

[0015] The embodiment of the present application provides a driving protection circuit and an inverter, and the driving protection circuit includes: a sampling module, a first comparison module, a second comparison module and a driving module. The sampling module is connected to the first comparison module, the second comparison module and the inverter circuit respectively, the first comparison module and the second comparison module are both connected to the driving module, and the driving module is connected to the switch tube of the inverter circuit. The embodiment of the present application collects the current signal of the inverter circuit through the sampling module and converts the current signal into a voltage signal; when the voltage signal is greater than the first preset voltage, the first comparison module outputs a first control signal to the driving module; when the voltage signal is less than the second preset voltage, the second comparison module outputs a first control signal to the driving module; wherein the first preset voltage is greater than the second preset voltage; when receiving the first control signal, the driving module locks the driving signal output to the switch tube to a low level, so that the switch tube stops working, thereby realizing that when the current signal in the inverter circuit is too large or too small, the switch tube in the inverter circuit is turned off to protect the components in the circuit from being damaged, thereby improving the safety of the circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] One or more embodiments are exemplarily described by corresponding drawings, which do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and the figures in the drawings do not constitute proportional limitations unless otherwise stated.

[0017] Figure 1 is a structural block diagram of an inverter provided in an embodiment of the present application;

[0018] Figure 2 is a structural block diagram of a driving protection circuit provided by an embodiment of the present application;

[0019] Figure 3 It is a circuit structure diagram of an inverter circuit;

[0020] Figure 4 is a schematic diagram of the circuit structure of a sampling module provided in an embodiment of the present application;

[0021] Figure 5 It is a circuit structure diagram of a first comparison module, a second comparison module, an anti-reverse module and a filtering module provided in an embodiment of the present application;

[0022] Figure 6 is a structural block diagram of a driving module provided in an embodiment of the present application;

[0023] Figure 7 is a schematic diagram of a circuit structure of a switch unit provided in an embodiment of the present application;

[0024] Figure 8 Schematic diagram of the circuit structure of a driving unit provided in one embodiment of the present application. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and in detail in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0026] The technical features involved in the various embodiments of the present application described below do not conflict with each other and can be combined with each other.

[0027] When an element is referred to as being “connected to” another element, it can be directly connected to the other element, or one or more intervening elements may be present therebetween.

[0028] The terms "first", "second", etc. in the specification and claims of this application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally of the same type, and the number of objects is not limited. For example, the first object can be one or more.

[0029] In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the previously and subsequently associated objects are in an "or" relationship.

[0030] See also Figure 1 , Figure 1 It is a structural block diagram of an inverter 1000 provided in an embodiment of the present application.

[0031] The embodiment of the present application provides an inverter 1000 , including: an inverter circuit 200 and the following drive protection circuit 100 . The inverter circuit 200 is connected to the drive protection circuit 100 .

[0032] Specifically, the driving protection circuit 100 is used to collect the current signal of the inverter circuit 200 and convert the current signal into a voltage signal, and when the voltage signal is greater than the first preset voltage, or when the voltage signal is less than the second preset voltage, the driving signal output to the switch tube of the inverter circuit 200 is locked to a low level. The first preset voltage and the second preset voltage are determined by the connection relationship between the components of the circuit and are not specifically limited here.

[0033] See also Figure 2 , Figure 2 1 is a structural block diagram of a driving protection circuit 100 provided in an embodiment of the present application.

[0034] The embodiment of the present application provides a driving protection circuit 100, including: a sampling module 10, a first comparison module 20, a second comparison module 30 and a driving module 40. Specifically, the sampling module 10 is connected to the first comparison module 20, the second comparison module 30 and the inverter circuit 200 respectively, the first comparison module 20 and the second comparison module 30 are both connected to the driving module 40, and the driving module 40 is connected to the switch tube of the inverter circuit 200.

[0035] Among them, the sampling module 10 collects the current signal of the inverter circuit 200 and converts the current signal into a voltage signal; then, when the voltage signal is greater than the first preset voltage, the first comparison module 20 outputs a first control signal to the driving module 40; when the voltage signal is less than the second preset voltage, the second comparison module 30 outputs a first control signal to the driving module 40; wherein the first preset voltage is greater than the second preset voltage; when the driving module 40 receives the first control signal, the driving module 40 locks the driving signal output to the switch tube to a low level to stop the switch tube from working.

[0036] In this embodiment, the inverter circuit 200 can convert direct current into alternating current, or convert alternating current into direct current.

[0037] See also Figure 3 , Figure 3 It is a circuit structure diagram of the inverter circuit.

[0038] like Figure 3 As shown, the inverter circuit 200 includes a switch tube Q1, a switch tube Q2, a switch tube Q4, a switch tube Q5, an inductor L1, a current sensor U1, a transformer, etc. Specifically, the switch tube Q1, the switch tube Q2, the switch tube Q4, and the switch tube Q5 form a full-bridge inverter circuit. The control end of the switch tube Q1, the control end of the switch tube Q2, the control end of the switch tube Q4, and the control end of the switch tube Q5 are all connected to the drive protection circuit 100, and the drive protection circuit 100 controls the on and off of the switch tubes Q1, Q2, Q4, and Q5. The Hall sensor is also connected to the drive protection circuit 100, and the drive protection circuit 100 obtains the current signal in the inverter circuit 200 through the Hall sensor.

[0039] See also Figure 4 , Figure 4 Schematic diagram of the circuit structure of the sampling module 10 provided in one embodiment of the present application.

[0040] In some embodiments, Figure 4As shown, the sampling module 10 includes: an amplifier U1A, a resistor R1, a resistor R3, a resistor R5, a resistor R6, and a capacitor C6. Specifically, the in-phase input terminal of the amplifier U1A is connected to the second end of the resistor R1 and the second end of the resistor R3, the first end of the resistor R1 is connected to the second power supply, the first end of the resistor R3 is connected to the inverter circuit 200, the inverting input terminal of the amplifier U1A is connected to the second end of the resistor R5, the first end of the resistor R6 and the first end of the capacitor C6, the first end of the resistor R5 is connected to the inverter circuit 200, and the output terminal of the amplifier U1A is connected to the second end of the resistor R6, the second end of the capacitor C6, the first comparison module 20 and the second comparison module 30.

[0041] In this embodiment, when the inverter circuit 200 converts direct current into alternating current, or converts alternating current into direct current, the sampling module 10 reduces the current of the current signal through the resistor R2 and the resistor R4, and forms a voltage signal after passing through the amplifier U1A. The voltage signal is output to the first comparison module 20, the second comparison module 30 and the controller (not shown).

[0042] The controller can calculate the current based on the voltage signal and perform corresponding control. For example, when the controller calculates that the current of the inverter circuit 200 is too large based on the voltage signal, the controller no longer outputs a drive signal to the drive module, and the drive signal is usually a PWM (Pulse Width Modulation) signal.

[0043] See also Figure 5 , Figure 5 It is a circuit structure diagram of a first comparison module 20, a second comparison module 30, an anti-reverse module and a filtering module provided in an embodiment of the present application.

[0044] In some embodiments, the first comparison module 20 includes: a comparator U3A, a resistor R12, a resistor R14, a resistor R20, and a resistor R22. Specifically, the in-phase input terminal of the comparator U3A is connected to the second end of the resistor R14 and the first end of the resistor R20, the first end of the resistor R14 is connected to the sampling module 10, the second end of the resistor R20 is grounded, the inverting input terminal of the comparator U3A is connected to the second end of the resistor R12 and the first end of the resistor R22, the first end of the resistor R12 is connected to the first power supply, the second end of the resistor R22 is grounded, and the output terminal of the comparator U3A is connected to the driving module 40.

[0045] In this embodiment, a voltage signal is input at I_INV, and the voltage signal is sent to the non-inverting input terminal of the comparator U3A through the resistor R14 and the capacitor C13. The inverting input terminal of the comparator U3A is connected to the first power supply, such as 3.3V DC, through the resistor R12, so that the comparator U3A presets a first preset voltage. When the voltage of the voltage signal is greater than or equal to the first preset voltage, the output of the comparator U3A changes from a low level to a high level, that is, the first control signal. When the voltage of the voltage signal is less than the first preset voltage, the output of the comparator U3A changes from a high level to a low level.

[0046] In some embodiments, the second comparison module 30 includes: a comparator U3B, a resistor R27, and a resistor R29. Specifically, the inverting input terminal of the comparator U3B is connected to the sampling module 10 through the first comparison module 20, the non-inverting input terminal of the comparator U3B is connected to the second end of the resistor R27 and the first end of the resistor R29, the first end of the resistor R27 is connected to the first power supply, the second end of the resistor R29 is grounded, and the output terminal of the comparator U3B is connected to the driving module 40.

[0047] In this embodiment, a voltage signal is input at I_INV, and the voltage signal is sent to the inverting input terminal of the comparator U3B through the resistor R14 and the capacitor C13. The non-inverting input terminal of the comparator U3B is connected to the first power supply, such as 3.3V DC, through the resistor R27, so that the comparator U3B presets the second preset voltage. When the voltage of the voltage signal is less than the second preset voltage, the output of the comparator U3B changes from a low level to a high level, that is, the first control signal. When the voltage of the voltage signal is greater than or equal to the second preset voltage, the output of the comparator U3B changes from a high level to a low level, that is, the first control signal.

[0048] It should be noted that the first preset voltage is greater than the second preset voltage, and the first preset voltage and the second preset voltage are determined by the connection relationship between components of the circuit and the components, and are not specifically limited here.

[0049] In some embodiments, Figure 5 As shown, the driving protection circuit 100 further includes an anti-reverse module, the first comparison module 20 is connected to the driving module 40 via the anti-reverse module, and the second comparison module 30 is connected to the driving module 40 via the anti-reverse module.

[0050] The anti-reverse module includes: a diode D1 and a diode D2. Specifically, the anode of the diode D1 is connected to the first comparison module 20, the cathode of the diode D1 is connected to the driving module 40, the anode of the diode D2 is connected to the second comparison module 30, and the cathode of the diode D2 is connected to the driving module 40.

[0051] When one of the comparators U3A and U3B outputs a high level and the other outputs a low level, the anti-reverse module can prevent the high level of the output from being pulled low, so as to ensure reliable operation of the switch unit 401.

[0052] In some embodiments, Figure 5 As shown, the driving protection circuit 100 further includes a filtering module. The filtering module includes: a capacitor C11 and a capacitor C15. The capacitor C11 filters the signal output by the comparator U3A, and the capacitor 15 filters the signal output by the comparator U3B.

[0053] See also Figure 6 , Figure 6 It is a structural block diagram of a driving module provided in one embodiment of the present application.

[0054] In some embodiments, Figure 6 As shown, the driving module 40 includes: a switch unit 401 and a driving unit 402. Specifically, the switch unit 401 is connected to the driving unit 402, the first comparison module 20, and the second comparison module 30 respectively, and the driving unit 402 is connected to the switch tube of the inverter circuit 200. The switch unit 401 is used to turn on when receiving the first control signal to output a first level signal to the driving unit 402; the driving unit 402 is used to lock the driving signal output to the switch tube to a low level when receiving the first level signal. In some embodiments, the first level signal is a low level signal.

[0055] See also Figure 7 , Figure 7 Schematic diagram of the circuit structure of the switch unit 401 in the driving module 40 provided in an embodiment of the present application.

[0056] In some embodiments, the switch unit 401 includes: a switch tube Q1, a resistor R15 and a resistor R21. Specifically, the base of the switch tube Q1 is connected to the first comparison module 20 and the second comparison module 30 through the resistor R15, the first end of the resistor R21 is connected to the base of the switch tube Q1, the second end of the resistor R21 is grounded, the emitter of the switch tube Q1 is grounded, and the collector of the switch tube Q1 is connected to the driving unit 402. Among them, the resistance value of the resistor R21 needs to be set to a larger value, and the purpose of grounding the resistor R21 is to prevent Q1 from being mis-conducted.

[0057] In this embodiment, when the first control signal, i.e., a high level signal, is input to the base of the switch tube Q1, the switch tube Q1 is turned on, and the collector of the switch tube Q1 outputs a low level. When a low level signal is input to the base of the switch tube Q1, the switch tube Q1 is turned off.

[0058] See also Figure 8 , Figure 8Schematic diagram of the circuit structure of the driving unit 402 in the driving module 40 provided in one embodiment of the present application.

[0059] In some embodiments, Figure 8 As shown, the driving unit 402 includes: a resistor R7, a capacitor C8 and at least one driving sub-unit, Figure 8 Take four driving sub-units as an example. Specifically, the driving sub-units include: an AND gate U2A, a resistor R8, a resistor R9, a resistor R10, and a resistor R11. Specifically, the first input end of the AND gate U2A is respectively connected to the second end of the resistor R7, the first end of the capacitor C8, and the switch unit 401, the first end of the resistor R7 is connected to the first power supply, the second end of the capacitor C8 is grounded, the second input end of the AND gate U2A is connected to the second end of the resistor R9, the first end of the resistor R9 is connected to the first end of the resistor R10 and the controller (not shown), the second end of the resistor R10 is grounded, the output end of the AND gate U2A is connected to the first end of the resistor R8 and the first end of the resistor R11, the second end of the resistor R11 is grounded, and the second end of the resistor R8 is connected to the switch tube of the inverter circuit 200.

[0060] Figure 8 Taking four driving sub-units as an example, the principle of one of the driving sub-units is summarized below. In this embodiment, after the controller (not shown) sends a driving signal to the driving sub-unit, it is output through the driving sub-unit. The second power supply, for example, 3.3V voltage, is connected to the pin of the AND gate U2A through the resistor R7 and the capacitor C8 to serve as a reference level. At the same time, the reference voltage is connected to the collector of the switch tube Q1, that is, Figure 8 The OCP_INV terminal in the circuit. When the switch tube Q1 is turned on, the OCP_INV terminal is grounded through the switch tube Q1, pulling down the reference voltage of the gate U2A. At this time, the output of the controller's drive signal will be pulled down, so that the drive voltage of the switch tube in the inverter circuit 200 connected to the gate U2A is turned off, which can protect the switch tube from failure due to excessive current in the inverter circuit 200. The OCP_INV terminal is also connected to the controller (not shown), and the controller can use the signal of the OCP_INV terminal as a brake control signal. When the signal of the OCP_INV terminal is detected as a low-level signal multiple times in the same cycle, it can be determined that the system is overcurrent, and the controller can turn off the output drive signal.

[0061] Figure 5 The capacitors C11 and C15 in the circuit can prevent the output of the comparator U2 from repeatedly flipping due to sudden changes in current. Figure 8As shown, the resistor R7 and the capacitor C8 are set, and the charging and discharging time of the capacitor is T=RC. The capacitance values ​​of the capacitors C7 and C15 need to be set much smaller than the capacitance value of the capacitor C8, so that the charging and discharging time of the capacitors C7 and C15 is shorter than that of C8. When the overcurrent of the current signal of the inverter circuit is eliminated, the output of the AND gate U2A changes to a low level. At this time, the capacitors C7 and C15 are discharged to 0, and the switch tube Q1 is turned off, then the voltage at the OCP_INV end is no longer pulled down, and the second power supply, such as a 3.3V power supply, charges the capacitor C8 through the resistor R7. When the capacitor C8 is charged to above the opening threshold of the AND gate U2A, the output of the AND gate U2A will be pulled high to reopen the driving signal to drive the switch tube in the inverter circuit 200. At the same time, the charging and discharging time T can be adjusted by adjusting the parameters of the resistor R7 and the capacitor C8, which can not only avoid the damage of the switch tube in the inverter circuit 200 caused by too slow chopping speed, but also avoid the problem of excessive switching loss caused by multiple chopping in the same cycle.

[0062] The embodiment of the present application provides a driving protection circuit and an inverter, and the driving protection circuit includes: a sampling module, a first comparison module, a second comparison module and a driving module. The sampling module is connected to the first comparison module, the second comparison module and the inverter circuit respectively, the first comparison module and the second comparison module are both connected to the driving module, and the driving module is connected to the switch tube of the inverter circuit. The embodiment of the present application collects the current signal of the inverter circuit through the sampling module and converts the current signal into a voltage signal; when the voltage signal is greater than the first preset voltage, the first comparison module outputs a first control signal to the driving module; when the voltage signal is less than the second preset voltage, the second comparison module outputs a first control signal to the driving module; wherein the first preset voltage is greater than the second preset voltage; when receiving the first control signal, the driving module locks the driving signal output to the switch tube to a low level to stop the switch tube from working, thereby realizing that when the current signal in the inverter circuit is too large or too small, the switch tube in the inverter circuit is turned off to protect the components in the circuit from being damaged, thereby improving the safety of the circuit.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Based on the idea of ​​the present application, the technical features in the above embodiments or different embodiments may also be combined, and there are many other changes in different aspects of the present application as described above, which are not provided in detail for the sake of simplicity. Although the present application has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A driving protection circuit, characterized in that: include: A sampling module, a first comparing module, a second comparing module and a driving module; The sampling module is connected to the first comparison module, the second comparison module and the inverter circuit respectively, the first comparison module and the second comparison module are both connected to the driving module, and the driving module is connected to the switch tube of the inverter circuit; The sampling module is used to collect the current signal of the inverter circuit and convert the current signal into a voltage signal; The first comparison module is used for outputting a first control signal to the driving module when the voltage signal is greater than a first preset voltage; The second comparison module is used for outputting a first control signal to the driving module when the voltage signal is less than a second preset voltage; wherein the first preset voltage is greater than the second preset voltage; The driving module is used for locking the driving signal output to the switch tube to a low level when receiving the first control signal, so as to stop the switch tube from working.

2. The driving protection circuit according to claim 1, characterized in that: The driving module comprises: a switch unit and a driving unit; The switch unit is connected to the drive unit, the first comparison module, and the second comparison module respectively, and the drive unit is connected to the switch tube of the inverter circuit; The switch unit is used to be turned on when receiving the first control signal, so as to output a first level signal to the driving unit; The driving unit is used for locking the driving signal output to the switch tube to a low level when receiving the first level signal.

3. The driving protection circuit according to claim 2, characterized in that: The switch unit includes: a switch tube Q1, a resistor R15 and a resistor R21; The base of the switch tube Q1 is connected to the first comparison module and the second comparison module through the resistor R15, the first end of the resistor R21 is connected to the base of the switch tube Q1, the second end of the resistor R21 is grounded, the emitter of the switch tube Q1 is grounded, and the collector of the switch tube Q1 is connected to the driving unit.

4. The driving protection circuit according to claim 2, characterized in that: The driving unit includes: a resistor R7, a capacitor C8 and at least one driving sub-unit; The driving subunit includes: an AND gate U2A, a resistor R8, a resistor R9, a resistor R10, and a resistor R11; The first input end of the AND gate U2A is respectively connected to the second end of the resistor R7, the first end of the capacitor C8 and the switch unit, the first end of the resistor R7 is connected to the first power supply, the second end of the capacitor C8 is grounded, the second input end of the AND gate U2A is connected to the second end of the resistor R9, the first end of the resistor R9 is connected to the first end of the resistor R10 and the controller, the second end of the resistor R10 is grounded, the output end of the AND gate U2A is connected to the first end of the resistor R8 and the first end of the resistor R11, the second end of the resistor R11 is grounded, and the second end of the resistor R8 is connected to the switch tube of the inverter circuit.

5. The driving protection circuit according to claim 1, characterized in that: The first comparison module includes: a comparator U3A, a resistor R12, a resistor R14, a resistor R20, and a resistor R22; The non-inverting input terminal of the comparator U3A is connected to the second end of the resistor R14 and the first end of the resistor R20, the first end of the resistor R14 is connected to the sampling module, the second end of the resistor R20 is grounded, the inverting input terminal of the comparator U3A is connected to the second end of the resistor R12 and the first end of the resistor R22, the first end of the resistor R12 is connected to the first power supply, the second end of the resistor R22 is grounded, and the output terminal of the comparator U3A is connected to the driving module.

6. The driving protection circuit according to claim 1, characterized in that: The second comparison module includes: a comparator U3B, a resistor R27, and a resistor R29; The inverting input terminal of the comparator U3B is connected to the sampling module through the first comparison module, the non-inverting input terminal of the comparator U3B is connected to the second end of the resistor R27 and the first end of the resistor R29, the first end of the resistor R27 is connected to the first power supply, the second end of the resistor R29 is grounded, and the output terminal of the comparator U3B is connected to the driving module.

7. The driving protection circuit according to claim 1, characterized in that: The sampling module includes: an amplifier U1A, a resistor R1, a resistor R3, a resistor R5, a resistor R6, and a capacitor C6; The non-inverting input terminal of the amplifier U1A is connected to the second end of the resistor R1 and the second end of the resistor R3, the first end of the resistor R1 is connected to the second power supply, the first end of the resistor R3 is connected to the inverter circuit, the inverting input terminal of the amplifier U1A is connected to the second end of the resistor R5, the first end of the resistor R6 and the first end of the capacitor C6, the first end of the resistor R5 is connected to the inverter circuit, and the output terminal of the amplifier U1A is connected to the second end of the resistor R6, the second end of the capacitor C6, the first comparison module and the second comparison module.

8. The driving protection circuit according to any one of claims 1 to 7, characterized in that: The driving protection circuit further includes an anti-reverse module, the first comparison module is connected to the driving module via the anti-reverse module, and the second comparison module is connected to the driving module via the anti-reverse module.

9. The driving protection circuit according to claim 8, characterized in that: The anti-reverse module includes: a diode D1 and a diode D2; The anode of the diode D1 is connected to the first comparison module, the cathode of the diode D1 is connected to the driving module, the anode of the diode D2 is connected to the second comparison module, and the cathode of the diode D2 is connected to the driving module.

10. An inverter, characterized in that: include: An inverter circuit and a drive protection circuit as claimed in any one of claims 1 to 9, wherein the inverter circuit is connected to the drive protection circuit; The drive protection circuit is used to collect the current signal of the inverter circuit and convert the current signal into a voltage signal, and when the voltage signal is greater than a first preset voltage, or when the voltage signal is less than a second preset voltage, the drive signal output to the switch tube of the inverter circuit is locked to a low level.

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