Overvoltage protection device, method, electronic equipment and medium for power tube

Abstract

The present application discloses an overvoltage protection device, method, electronic device and medium for a power tube, which are applied to the field of circuit control. In the device provided by the present application, the primary coil of the transformer is connected to the first end of the power tube, the first end of the voltage protection reset module is connected to the first end of the power drive module, the second end of the voltage protection reset module is grounded, the second end of the power drive module is connected to the control end of the power tube, the positive input end of the comparator is connected to the primary coil and the first end of the power tube, the negative input end of the comparator is connected to the preset voltage source, and the output end of the comparator is connected to the first end of the power drive module and the first end of the voltage protection reset module, which is used to reduce the voltage provided by the voltage protection reset module and control the power drive module to send a cutoff signal to the power tube when the voltage value of the primary coil is greater than the voltage value provided by the preset voltage source. It can be seen that the present application provides overvoltage protection for the power tube through a comparator.

Description

Technical Field

[0001] The present application relates to the field of circuit control, and in particular to an overvoltage protection device, method, electronic equipment and medium for a power tube. Background Art

[0002] The voltage resistance of the power tube in the switching power supply is limited. During normal operation, the power tube is already subjected to a very high voltage. When an abnormal state is superimposed, the power tube will superimpose an additional voltage, which will make the actual voltage borne by the power tube much higher than the limit voltage resistance. Exceeding the limit voltage resistance will damage the power tube.

[0003] The working principle of the switching power supply is as follows: the primary coil of the transformer is connected to the IC chip, which includes a power tube inside, and the secondary coil of the transformer is connected to a diode. Under normal circumstances, when the transformer is turned on, the primary coil excitation energy is transmitted through the secondary coil when the transformer is turned off. However, the diode connected to the secondary coil may have welding quality problems due to the prior art. When the diode is disconnected in the secondary coil, the excitation energy on the primary coil of the transformer cannot be transmitted. At this time, the voltage at the connection between the primary coil and the power tube will continue to increase, and the corresponding voltage from one end of the power tube to the other end of the power tube will continue to increase, which will cause the voltage from one end of the power tube to the other end of the power tube to exceed the withstand voltage of the power tube, thereby causing the power tube to fail. In severe cases, the machine will explode.

[0004] In view of the above technology, seeking an overvoltage protection device for a power tube is an urgent problem to be solved by those skilled in the art. Summary of the invention

[0005] The purpose of the present application is to provide an overvoltage protection device, method, electronic device and medium for a power tube, which can solve the problem of burning the power tube or exploding the machine due to the inability to provide overvoltage protection for the power tube in the prior art.

[0006] In order to solve the above technical problems, the present application provides an overvoltage protection device for a power tube, comprising a transformer, a power driving module, a voltage protection reset module, and a power tube, wherein the primary coil of the transformer is connected to the first end of the power tube, the first end of the voltage protection reset module is connected to the first end of the power driving module, the second end of the voltage protection reset module is grounded, and the second end of the power driving module is connected to the control end of the power tube, and further comprising: a comparator and a preset voltage source;

[0007] Among them, the positive input end of the comparator is connected to the original coil and the first end of the power tube, the negative input end of the comparator is connected to the preset voltage source, and the output end of the comparator is connected to the first end of the power driving module and the first end of the voltage protection reset module, and is used to reduce the voltage provided by the voltage protection reset module and control the power driving module to send a cutoff signal to the power tube when the voltage value of the original coil is greater than the voltage value provided by the preset voltage source.

[0008] Preferably, it further comprises: a first voltage-dividing resistor and a second voltage-dividing resistor;

[0009] Wherein, the first end of the first voltage-dividing resistor is connected to the primary coil of the transformer, the second end of the first voltage-dividing resistor is connected to the positive input end of the comparator and the first end of the second voltage-dividing resistor;

[0010] The second end of the second voltage-dividing resistor is grounded.

[0011] Preferably, it also includes: a counting module;

[0012] The first end of the counting module is connected to the output end of the comparator, and the second end of the counting module is connected to the first end of the power driving module and the first end of the voltage protection reset module.

[0013] Preferably, it also includes: an inductor;

[0014] The first end of the inductor is connected to the first end of the power tube, and the second end of the inductor is connected to the bus.

[0015] Preferably, it further comprises: a first capacitor and a second capacitor;

[0016] Wherein, the first end of the first capacitor is connected to the second end of the inductor, and the second end of the first capacitor is grounded;

[0017] The first end of the second capacitor is connected to the second end of the voltage protection reset module, the second end of the second capacitor is connected to the second end of the first capacitor and the second end of the power tube, and is grounded.

[0018] In order to solve the above technical problems, the present application also provides an overvoltage protection method for a power tube, which is applied to an overvoltage protection device for a power tube including a comparator, a transformer, a power driving module, a voltage protection reset module, and a power tube, wherein the primary coil of the transformer is connected to the first end of the power tube, the first end of the voltage protection reset module is connected to the first end of the power driving module, the second end of the voltage protection reset module is grounded, the second end of the power driving module is connected to the control end of the power tube, the positive input end of the comparator is connected to the primary coil and the first end of the power tube, the negative input end of the comparator is connected to a preset voltage source, and the output end of the comparator is connected to the first end of the power driving module and the first end of the voltage protection reset module. The method includes:

[0019] Obtain the voltage value of the primary coil of the transformer;

[0020] Determine the relationship between the voltage value and the preset voltage value;

[0021] When the voltage value is greater than the preset voltage value, the voltage provided by the voltage protection reset module is reduced and the power driving module is controlled to send a cutoff signal to the power tube.

[0022] Preferably, after the voltage value is greater than the preset voltage value, the method further comprises:

[0023] Obtain the number of times the voltage value is greater than a preset voltage value within a preset time;

[0024] If the number of times is greater than the preset number of times, the voltage provided by the voltage protection reset module is reduced and the power driving module is controlled to send a cutoff signal to the power tube.

[0025] Preferably, before obtaining the voltage value of the primary coil of the transformer, the method further includes:

[0026] When the voltage provided by the voltage protection reset module reaches the preset supply voltage, the power driving module is controlled to send a driving signal so that the power tube is turned on according to the driving signal.

[0027] To solve the above technical problems, the present application also provides an electronic device, including a memory for storing a computer program;

[0028] The processor is used to implement the steps of the above-mentioned overvoltage protection method for a power tube when executing a computer program.

[0029] In order to solve the above technical problems, the present application also provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the above-mentioned overvoltage protection method for a power tube are implemented.

[0030] The present application provides an overvoltage protection device for a power tube, comprising a transformer, a power driving module, a voltage protection reset module, and a power tube, wherein the primary coil of the transformer is connected to the first end of the power tube, the first end of the voltage protection reset module is connected to the first end of the power driving module, the second end of the voltage protection reset module is grounded, and the second end of the power driving module is connected to the control end of the power tube, and also includes: a comparator and a preset voltage source; wherein the positive input end of the comparator is connected to the primary coil and the first end of the power tube, the negative input end of the comparator is connected to the preset voltage source, and the output end of the comparator is connected to the first end of the power driving module and the first end of the voltage protection reset module, and is used for reducing the voltage provided by the voltage protection reset module and controlling the power driving module to send a cutoff signal to the power tube when the voltage value of the primary coil is greater than the voltage value provided by the preset voltage source. It can be seen that the present application determines the voltage at the primary coil of the transformer by adding a comparator and a preset voltage source in the circuit. When the voltage value of the primary coil is greater than the voltage value provided by the preset voltage source, the power driving module is controlled to send a cutoff signal to the power tube so that the power tube is cut off, thereby avoiding the phenomenon that the power tube burns out when the voltage value of the primary coil is greater than the voltage value provided by the preset voltage source. At the same time, when the voltage value of the primary coil is greater than the voltage value provided by the preset voltage source, the voltage provided by the voltage protection reset module is also reduced to avoid the voltage provided by the voltage protection reset module from turning on the power tube. The overvoltage protection device for a power tube provided in the present application protects the normal operation of the power tube in the circuit from two aspects, and the effect is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0032] FIG1 is a first schematic diagram of a switching power supply in the prior art;

[0033] FIG2 is a second schematic diagram of a switching power supply in the prior art;

[0034] FIG3 is a voltage waveform diagram of a switching power supply in the prior art when the switching power supply is in a continuous working mode;

[0035] FIG4 is a voltage waveform diagram of a switching power supply in the prior art when the switching power supply is in a discontinuous working mode;

[0036] FIG5 is a schematic diagram of an overvoltage protection device for a power tube provided in an embodiment of the present application;

[0037] FIG6 is a specific schematic diagram of an overvoltage protection device for a power tube provided in an embodiment of the present application;

[0038] FIG7 is a first timing diagram provided in an embodiment of the present application;

[0039] FIG8 is a second timing diagram provided in an embodiment of the present application;

[0040] FIG9 is a specific schematic diagram of a transistor overvoltage protection device provided in an embodiment of the present application;

[0041] FIG10 is a flow chart of an overvoltage protection method for a power tube provided by another embodiment of the present application;

[0042] FIG. 11 is a structural diagram of an electronic device provided in another embodiment of the present application. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0044] The core of this application is to provide an overvoltage protection device, method, electronic equipment and medium for a power tube.

[0045] In order to enable those skilled in the art to better understand the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0046] The voltage resistance of the power tube in the switching power supply is limited. During normal operation, the power tube is already subjected to a very high voltage. When an abnormal state is superimposed, the power tube will superimpose an additional voltage, which will make the actual voltage borne by the power tube much higher than the limit voltage resistance. Exceeding the limit voltage resistance will damage the power tube.

[0047] The specific structural connection mode of the switching power supply is shown in FIG1 and FIG2: the first end of the first diode D11 is connected to the first end of the second diode D12, the first end of the first capacitor C11, the first end of the second capacitor C12, the first end of the first resistor R11, and the first end of the primary coil of the transformer T11; the second end of the first diode D11 is connected to the first end of the third diode D13; the second end of the second diode D12 is connected to the first end of the fourth diode D14; the second end of the third diode D13 is connected to the second end of the fourth diode D14 and the second end of the first capacitor C11, and is grounded. The second end of the second capacitor C12 is connected to the second end of the first resistor R11 and the first end of the fifth diode D15; the second end of the fifth diode D15 is connected to the second end N of the primary coil of the transformer T11 P(C / D), the first end of the IC chip is connected, the second end of the IC chip is connected to the second end of the first capacitor C11, the second end of the third diode D13 and the second end of the fourth diode D14, and grounded. The first end of the sixth diode D16 is connected to the first end N of the secondary coil of the transformer T11. S The second end of the sixth diode D16 is connected to the first end of the third capacitor C13 and the first end of the second resistor R12, and the second end of the third capacitor C13 is connected to the second end of the second resistor R12 and the second end of the secondary coil of the transformer T11, wherein AC is an external power supply, Vo+ is the positive electrode of the output voltage, and Vo- is the negative electrode of the output voltage. The IC chip includes a voltage protection reset module 21, a power drive module 22 and a power tube 23, wherein the first end of the voltage reset module 21 is connected to the first end of the power drive module 22, the second end of the voltage reset module 21 is grounded, and the second end of the power drive module 22 is connected to the power tube 23. The working principle of its switching power supply is: when the voltage provided by the voltage protection reset module 21 reaches a certain voltage value, the power drive module 22 is controlled to send a conduction signal so that the power tube 23 is turned on. Under normal circumstances, when the transformer is turned on, the primary coil excitation energy, and when the transformer is turned off, the energy of the primary coil is transmitted through the secondary coil. However, the sixth diode D16 connected to the secondary coil has welding quality problems due to the prior art. When the sixth diode D16 is disconnected in the secondary coil, the NP excitation energy on the primary coil of the transformer cannot be transmitted, which will cause the voltage on the primary coil to increase, as shown in Figures 3 and 4, where the circuit is divided into two modes, namely, continuous working mode (CCM) and discontinuous working mode (DCM). Switch ON represents that the power tube 23 is turned on, and the primary coil of the transformer excites and stores energy. Switch OFF represents that the power tube 23 is turned off, and the primary coil of the transformer releases the Switch ON excitation storage energy. It can be seen from Figures 3 and 4 that no matter which mode it is in, when the sixth diode D16 is disconnected in the secondary coil, the excitation energy of the primary coil in Switch ON cannot be released when Switch OFF, which will cause the voltage at the second end of the primary coil to increase abnormally when Switch OFF. That is, the first end of the power tube 23 connected to the second end of the primary coil will exceed the withstand voltage of the power tube 23 when Switch OFF, thereby causing the power tube 23 to fail, and in severe cases, the machine will explode.

[0048] In order to solve the above technical problems, the present application provides an overvoltage protection device for a power tube, comprising a transformer, a power driving module, a voltage protection reset module, and a power tube, wherein the primary coil of the transformer is connected to the first end of the power tube, the first end of the voltage protection reset module is connected to the first end of the power driving module, the second end of the voltage protection reset module is grounded, and the second end of the power driving module is connected to the control end of the power tube, and further comprising: a comparator and a preset voltage source;

[0049] Among them, the positive input end of the comparator is connected to the original coil and the first end of the power tube, the negative input end of the comparator is connected to the preset voltage source, and the output end of the comparator is connected to the first end of the power driving module and the first end of the voltage protection reset module, and is used to reduce the voltage provided by the voltage protection reset module and control the power driving module to send a cutoff signal to the power tube when the voltage value of the original coil is greater than the voltage value provided by the preset voltage source.

[0050] In a specific embodiment, as shown in FIG5 , an overvoltage protection device for a power tube is provided, wherein the connection point of the primary coil of the transformer is (C / D), the power driving module 1, the voltage protection reset module 2, the power tube 3, the comparator 4 and the preset voltage source (VREF3). The primary coil (C / D) of the transformer is connected to the first end of the power tube 3, the first end of the voltage protection reset module 2 is connected to the first end of the power driving module 1, the second end of the voltage protection reset module 2 is grounded, the second end of the power driving module 1 is connected to the control end of the power tube 3, the positive input end of the comparator 4 is connected to the primary coil (C / D) and the first end of the power tube 3, the negative input end of the comparator 4 is connected to the preset voltage source (VREF3), and the output end of the comparator 4 is connected to the first end of the power driving module 1 and the first end of the voltage protection reset module 2.

[0051] Among them, the specific working principle of an overvoltage protection device for a power tube is as follows: when the voltage provided by the voltage protection reset device 2 reaches a certain voltage value (V CC-ON ), the power driving module 1 is controlled to send a conduction signal (DRV) to the power tube, so that the power tube 3 is in the conduction state according to the conduction signal. At this time, the circuit, internal components, voltage and current in the protection device are normal. When the transformer fails, the voltage at the primary coil (C / D) end of the transformer increases. At this time, the comparator 4 obtains the voltage at the primary coil (C / D) end of the transformer and compares it with the voltage provided by the preset voltage source (VREF3). When the voltage at the primary coil (C / D) end of the transformer is greater than the voltage provided by the preset voltage source (VREF3), the comparator 4 outputs a control signal. The control signal controls the power driving module 1 to send a cut-off signal to the power tube 3, so that the power tube 3 controls itself to be in the cut-off state according to the cut-off signal. At the same time, the control signal controls the voltage provided by the voltage protection reset module 2 to be reduced to V CC-UVLO , which prevents the original voltage provided by the voltage protection reset module 2 from controlling the power driving module 1 to send a conduction signal to the power tube 3. After that, the overvoltage protection device of the power tube is restarted, and the above working principle is cycled again.

[0052] It should be noted that the power tube can be a triode or a field effect transistor, which is not limited in the present application and can be set according to the needs of the user.

[0053] The present application provides an overvoltage protection device for a power tube, comprising a transformer, a power driving module, a voltage protection reset module, and a power tube, wherein the primary coil of the transformer is connected to the first end of the power tube, the first end of the voltage protection reset module is connected to the first end of the power driving module, the second end of the voltage protection reset module is grounded, and the second end of the power driving module is connected to the control end of the power tube, and also includes: a comparator and a preset voltage source; wherein the positive input end of the comparator is connected to the primary coil and the first end of the power tube, the negative input end of the comparator is connected to the preset voltage source, and the output end of the comparator is connected to the first end of the power driving module and the first end of the voltage protection reset module, and is used for reducing the voltage provided by the voltage protection reset module and controlling the power driving module to send a cutoff signal to the power tube when the voltage value of the primary coil is greater than the voltage value provided by the preset voltage source. It can be seen that the present application determines the voltage at the primary coil of the transformer by adding a comparator and a preset voltage source in the circuit. When the voltage value of the primary coil is greater than the voltage value provided by the preset voltage source, the power driving module is controlled to send a cutoff signal to the power tube so that the power tube is cut off, thereby avoiding the phenomenon that the power tube burns out when the voltage value of the primary coil is greater than the voltage value provided by the preset voltage source. At the same time, when the voltage value of the primary coil is greater than the voltage value provided by the preset voltage source, the voltage provided by the voltage protection reset module is also reduced to avoid the voltage provided by the voltage protection reset module from turning on the power tube. The overvoltage protection device for a power tube provided in the present application protects the normal operation of the power tube in the circuit from two aspects, and the effect is better.

[0054] Based on the above embodiment, as a preferred embodiment, it further includes: a first voltage-dividing resistor and a second voltage-dividing resistor;

[0055] The first end of the first voltage-dividing resistor is connected to the primary coil of the transformer, the second end of the first voltage-dividing resistor is connected to the positive input end of the comparator and the first end of the second voltage-dividing resistor; the second end of the second voltage-dividing resistor is grounded.

[0056] Also includes: a counting module;

[0057] The first end of the counting module is connected to the output end of the comparator, and the second end of the counting module is connected to the first end of the power driving module and the first end of the voltage protection reset module.

[0058] In a specific embodiment, as shown in FIG6 , it includes: a first voltage-dividing resistor R31, a second voltage-dividing resistor R32 and a counting module 5. The first end of the first voltage-dividing resistor R31 is connected to the primary coil (C / D) of the transformer, the second end of the first voltage-dividing resistor R31 is connected to the positive input end of the comparator 4 and the first end of the second voltage-dividing resistor R32; the second end of the second voltage-dividing resistor R32 is grounded. The first end of the counting module 5 is connected to the output end of the comparator 4, and the second end of the counting module 5 is connected to the first end of the power driving module 1 and the first end of the voltage protection reset module 2.

[0059] The purpose of the first voltage-dividing resistor R31 and the second voltage-dividing resistor R32 is to obtain the voltage at the primary coil (C / D) end based on the protection device. The voltage value provided by the preset voltage source is calculated as follows:

[0060] ;

[0061] When the voltage at the primary coil (C / D) is greater than V C / D-OVP When the comparator 4 outputs a control signal (PRE-PRO), the control signal (PRE-PRO) enters the counting module 5 at this time. The counting module 5 obtains the number of control signals (PRE-PRO) within the preset time. If the number reaches the preset number, the counting module 5 sends a target control signal (PRO). The target control signal (PRO) controls the power driving module 1 to send a cut-off signal to the power tube 3, so that the power tube 3 controls itself to be in the cut-off state according to the cut-off signal. At the same time, the target control signal (PRO) controls the voltage provided by the voltage protection reset module 2 to be reduced to V CC-UVLO , which prevents the original voltage provided by the voltage protection reset module 2 from controlling the power driving module 1 to send a conduction signal to the power tube 3. After that, the overvoltage protection device of the power tube is restarted, and the above working principle is cycled again.

[0062] On this basis, as shown in FIG6 , it also includes: an inductor;

[0063] The first end of the inductor is connected to the first end of the power tube, and the second end of the inductor is connected to the bus.

[0064] Also includes: a first capacitor and a second capacitor;

[0065] Wherein, the first end of the first capacitor is connected to the second end of the inductor, and the second end of the first capacitor is grounded;

[0066] The first end of the second capacitor is connected to the second end of the voltage protection reset module, the second end of the second capacitor is connected to the second end of the first capacitor and the second end of the power tube, and is grounded.

[0067] In a specific embodiment, FIG6 also includes: an inductor L, a first capacitor C31, and a second capacitor C32. The first end of the inductor L is connected to the first end of the power tube 3, and the second end of the inductor L is connected to the bus (BUS); the first end of the first capacitor C31 is connected to the second end of the inductor L, and the second end of the first capacitor C31 is grounded (GND); the first end of the second capacitor C32 is connected to the second end of the voltage protection reset module 2, and the second end of the second capacitor C32 is connected to the second end of the first capacitor C31 and the second end of the power tube 3, and is grounded (GND).

[0068] In summary, there are two cases when the power tube is over-voltage. Case 1: The over-voltage protection of the power tube is triggered within n cycles, as shown in Figure 7. The voltage provided by the voltage protection reset module 2 is the starting voltage V CC-ON When the transformer fails, there will be a flyback voltage at the primary coil (C / D). When the flyback voltage of the primary coil (C / D) exceeds V C / D-OVP When the comparator 4 outputs the PRE_PRO signal, the PRE_PRO outputs the PRO signal after passing through the counting module 5, and the PRO signal triggers the power tube overvoltage protection. After the power tube overvoltage protection is triggered, the power tube is cut off and the voltage provided by the voltage protection reset module is reduced to V CC-UVLO Restart. Within the n cycles of startup, as long as there is one cycle of the primary coil (C / D) voltage exceeding V C / D-OVP , a PRO signal will be issued, immediately triggering the power tube overvoltage protection.

[0069] Case 2: After starting n cycles, the power tube overvoltage protection is triggered, as shown in Figure 8. After starting n cycles, the power tube overvoltage protection is triggered, as shown in the timing diagram of Figure 5. After starting n cycles, when the voltage of the original coil (C / D) is greater than V C / D-OVP After counting for m cycles, the PRO signal is output to trigger the power tube overvoltage protection. After the power tube overvoltage protection is triggered, the power tube is cut off and the voltage provided by the voltage protection reset module is reduced to V CC-UVLO Reboot.

[0070] Among them, when the power tube is a triode, as shown in Figure 9, an overvoltage protection device of the power tube includes: an inductor L1, resistors: R61, R62, R63, R64, R65, a comparator 11, a counting module 12, a voltage protection reset module 13, a voltage control module 14, a power driving module 15, a triode Q61, a preset voltage source (VREF6), three voltage nodes A, B and C, and capacitors C61 and C62.

[0071] The connection relationship in the device is as follows: the first end of L1 is connected to the bus BUS, the second end of L1 is connected to the first end of R63 and the collector of Q61, the second end of R63 is connected to the first end of R64 and the first end of R61, the second end of R61 is connected to the positive input end of the comparator 11 and the first end of R62, and the second end of R62 is grounded; the negative input end of the comparator 11 is connected to the preset voltage source (VREF6), the output end of the comparator 11 is connected to the first end of the counting module 12 for transmitting the PRE-PRO signal; the second end of the counting module 12 is connected to the first end of the power driving module 15 and the first end of the voltage protection reset module 14, Used to send PRO signal; the second end of the power driving module 15 is connected to the base of Q61, the second end of R64 and the first end of R65, and is used to send DRV signal, the second end of R65 is connected to the first end of the voltage control module 14, the emitter of Q61 is connected to the second end of the voltage control module 14, the third end of the voltage control module 14 is grounded, and the fourth end of the voltage control module 14 is connected to the second end of the voltage protection reset module 13; the first end of C62 is connected to the second end of the voltage protection reset module 13 and the fourth end of the voltage control module 14, and the second end of C62 is grounded; the first end of C61 is connected to the second end of L1, and the second end of C61 is grounded.

[0072] The voltage at voltage node A is: V CC ;

[0073] The voltage at voltage node B is: ;

[0074] The voltage at the voltage node C is:

[0075] ;

[0076] Among them, the principle of the overvoltage protection device of the power tube shown in Figure 9 is the same as the principle described above, and this application will not elaborate on it here.

[0077] It should also be noted that the overvoltage protection device for the power tube shown in FIG. 9 is only one possible implementation method, but is not limited to this implementation method. The type of power tube can be set according to the needs of the user.

[0078] The present application provides an overvoltage protection device for a power tube, comprising a transformer, a power driving module, a voltage protection reset module, and a power tube, wherein the primary coil of the transformer is connected to the first end of the power tube, the first end of the voltage protection reset module is connected to the first end of the power driving module, the second end of the voltage protection reset module is grounded, and the second end of the power driving module is connected to the control end of the power tube, and also includes: a comparator and a preset voltage source; wherein the positive input end of the comparator is connected to the primary coil and the first end of the power tube, the negative input end of the comparator is connected to the preset voltage source, and the output end of the comparator is connected to the first end of the power driving module and the first end of the voltage protection reset module, and is used for reducing the voltage provided by the voltage protection reset module and controlling the power driving module to send a cutoff signal to the power tube when the voltage value of the primary coil is greater than the voltage value provided by the preset voltage source. It can be seen that the present application determines the voltage at the primary coil of the transformer by adding a comparator and a preset voltage source in the circuit. When the voltage value of the primary coil is greater than the voltage value provided by the preset voltage source, the power driving module is controlled to send a cutoff signal to the power tube so that the power tube is cut off, thereby avoiding the phenomenon that the power tube burns out when the voltage value of the primary coil is greater than the voltage value provided by the preset voltage source. At the same time, when the voltage value of the primary coil is greater than the voltage value provided by the preset voltage source, the voltage provided by the voltage protection reset module is also reduced to avoid the voltage provided by the voltage protection reset module from turning on the power tube. The overvoltage protection device for a power tube provided in the present application protects the normal operation of the power tube in the circuit from two aspects, and the effect is better.

[0079] In the above embodiments, the overvoltage protection device of the power tube is described in detail, and the present application also provides an embodiment corresponding to the overvoltage protection method of the power tube.

[0080] In order to solve the above technical problems, the present application provides an overvoltage protection method for a power tube, which is applied to an overvoltage protection device for a power tube including a comparator, a transformer, a power driving module, a voltage protection reset module, and a power tube, wherein the primary coil of the transformer is connected to the first end of the power tube, the first end of the voltage protection reset module is connected to the first end of the power driving module, the second end of the voltage protection reset module is grounded, the second end of the power driving module is connected to the control end of the power tube, the positive input end of the comparator is connected to the primary coil and the first end of the power tube, the negative input end of the comparator is connected to a preset voltage source, and the output end of the comparator is connected to the first end of the power driving module and the first end of the voltage protection reset module. As shown in FIG10, the method includes the following steps:

[0081] S10: Obtain the voltage value of the primary coil of the transformer.

[0082] S11: Determine the relationship between the voltage value and the preset voltage value.

[0083] S12: When the voltage value is greater than the preset voltage value, the voltage provided by the voltage protection reset module is reduced and the power driving module is controlled to send a cutoff signal to the power tube.

[0084] Specifically, in step S12: when the voltage value is greater than the preset voltage value, the method further includes:

[0085] Obtain the number of times the voltage value is greater than a preset voltage value within a preset time;

[0086] If the number of times is greater than the preset number of times, the voltage provided by the voltage protection reset module is reduced and the power driving module is controlled to send a cutoff signal to the power tube.

[0087] Specifically, in step S10: before obtaining the voltage value of the primary coil of the transformer, the method further includes:

[0088] When the voltage provided by the voltage protection reset module reaches the preset supply voltage, the power driving module is controlled to send a driving signal so that the power tube is turned on according to the driving signal.

[0089] Since the embodiments of the method part correspond to the embodiments of the device part, please refer to the description of the embodiments of the device part for the embodiments of the method part, which will not be repeated here.

[0090] FIG11 is a structural diagram of an electronic device provided by another embodiment of the present application. As shown in FIG11 , the electronic device includes: a memory 20 for storing a computer program;

[0091] The processor 21 is used to implement the steps of the overvoltage protection method for the power tube mentioned in the above embodiment when executing the computer program.

[0092] Among them, the processor 21 may include one or more processing cores, such as a 4-core processor, an 8-core processor, etc. The processor 21 can be implemented in at least one hardware form of a digital signal processor (DSP), a field-programmable gate array (FPGA), and a programmable logic array (PLA). The processor 21 may also include a main processor and a coprocessor. The main processor is a processor for processing data in the awake state, also known as a central processing unit (CPU); the coprocessor is a low-power processor for processing data in the standby state. In some embodiments, the processor 21 may be integrated with a graphics processing unit (GPU), which is responsible for rendering and drawing the content to be displayed on the display screen. In some embodiments, the processor 21 may also include an artificial intelligence (AI) processor, which is used to process computing operations related to machine learning.

[0093] The memory 20 may include one or more computer-readable storage media, which may be non-transitory. The memory 20 may also include a high-speed random access memory, and a non-volatile memory, such as one or more disk storage devices, flash memory storage devices. In this embodiment, the memory 20 is at least used to store the following computer program 201, wherein, after the computer program is loaded and executed by the processor 21, it can implement the relevant steps of the overvoltage protection method of the power tube disclosed in any of the aforementioned embodiments. In addition, the resources stored in the memory 20 may also include an operating system 202 and data 203, etc., and the storage method may be temporary storage or permanent storage. Among them, the operating system 202 may include Windows, Unix, Linux, etc.

[0094] In some embodiments, the electronic device may further include a display screen 22 , an input / output interface 23 , a communication interface 24 , a power source 25 , and a communication bus 26 .

[0095] Those skilled in the art will appreciate that the structure shown in FIG. 11 does not limit the electronic device and may include more or fewer components than those shown in the figure.

[0096] The electronic device provided in the embodiment of the present application includes a memory and a processor. When the processor executes the program stored in the memory, it can implement the above-mentioned overvoltage protection method for the power tube and has the above-mentioned beneficial effects.

[0097] Finally, the present application also provides an embodiment corresponding to a computer-readable storage medium. The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps recorded in the above method embodiment are implemented.

[0098] It is understandable that if the method in the above embodiment is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), disk or optical disk and other media that can store program code.

[0099] The above is a detailed introduction to an overvoltage protection device, method, electronic device and medium for a power tube provided by the present application. The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the embodiments can be referenced to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part description. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

[0100] It should also be noted that, in this specification, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

Claims

1. An overvoltage protection device for a power tube, comprising a transformer, a power drive module, a voltage protection reset module, and a power tube, wherein: The primary coil of the transformer is connected to the first end of the power tube, the first end of the voltage protection reset module is connected to the first end of the power driving module, the second end of the voltage protection reset module is grounded, and the second end of the power driving module is connected to the control end of the power tube, characterized in that it also includes: a comparator and a preset voltage source; The positive input end of the comparator is connected to the primary coil and the first end of the power tube, the negative input end of the comparator is connected to the preset voltage source, and the output end of the comparator is connected to the first end of the power driving module and the first end of the voltage protection reset module, and is used to reduce the voltage provided by the voltage protection reset module and control the power driving module to send a cutoff signal to the power tube when the voltage value of the primary coil is greater than the voltage value provided by the preset voltage source; Among them, it also includes: a counting module; Wherein, a first end of the counting module is connected to the output end of the comparator, and a second end of the counting module is connected to a first end of the power driving module and a first end of the voltage protection reset module.

2. The overvoltage protection device for a power tube according to claim 1, characterized in that: Also includes: A first voltage-dividing resistor and a second voltage-dividing resistor; Wherein, the first end of the first voltage-dividing resistor is connected to the primary coil of the transformer, and the second end of the first voltage-dividing resistor is connected to the positive input end of the comparator and the first end of the second voltage-dividing resistor; The second end of the second voltage-dividing resistor is grounded.

3. The overvoltage protection device for a power tube according to claim 1, characterized in that: Also includes: inductance; Wherein, the first end of the inductor is connected to the first end of the power tube, and the second end of the inductor is connected to the bus.

4. The overvoltage protection device for a power tube according to claim 3, characterized in that: Also includes: a first capacitor and a second capacitor; Wherein, the first end of the first capacitor is connected to the second end of the inductor, and the second end of the first capacitor is grounded; The first end of the second capacitor is connected to the second end of the voltage protection reset module, the second end of the second capacitor is connected to the second end of the first capacitor and the second end of the power tube, and is grounded.

5. A method for overvoltage protection of a power tube, characterized in that: An overvoltage protection device for a power tube is applied to a comparator, a transformer, a power driving module, a voltage protection reset module, a power tube and a counting module, wherein the primary coil of the transformer is connected to the first end of the power tube, the first end of the voltage protection reset module is connected to the first end of the power driving module, the second end of the voltage protection reset module is grounded, the second end of the power driving module is connected to the control end of the power tube, the positive input end of the comparator is connected to the primary coil and the first end of the power tube, the negative input end of the comparator is connected to a preset voltage source, the output end of the comparator is connected to the first end of the power driving module and the first end of the voltage protection reset module, the first end of the counting module is connected to the output end of the comparator, and the second end of the counting module is connected to the first end of the power driving module and the first end of the voltage protection reset module. The method comprises: Obtain the voltage value of the primary coil of the transformer; Determining the relationship between the voltage value and a preset voltage value; When the voltage value is greater than the preset voltage value, the voltage provided by the voltage protection reset module is reduced and the power driving module is controlled to send a cutoff signal to the power tube; Wherein, after the voltage value is greater than the preset voltage value, the method further includes: Obtaining the number of times that the voltage value is greater than the preset voltage value within a preset time; If the number is greater than the preset number, the voltage provided by the voltage protection reset module is reduced and the power driving module is controlled to send a cutoff signal to the power tube.

6. The overvoltage protection method for a power tube according to claim 5, characterized in that: Before obtaining the voltage value of the primary coil of the transformer, the method further includes: When the voltage provided by the voltage protection reset module reaches the preset supply voltage, the power driving module is controlled to send a driving signal so that the power tube is turned on according to the driving signal.

7. An electronic device, characterized in that: comprising a memory for storing a computer program; A processor is used to implement the steps of the overvoltage protection method for a power tube as claimed in claim 5 or 6 when executing the computer program.

8. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the overvoltage protection method for a power tube as claimed in claim 5 or 6 are implemented.

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