Clamping protection circuit

Abstract

The utility model provides a clamping protection circuit. The clamping protection circuit comprises a transformer module, a switch module, a current-limiting energy consumption module, an energy storage module, a discharge module and a control chip, the first end of the transformer module is connected with an input power supply, the second end of the transformer module is connected with the first end of the switch module, and the second end of the transformer module is connected with the first end of the current-limiting energy consumption module; a plurality of power supply output ends of the transformer module output a working power supply to the control chip and the power utilization module; a switch signal end of the control chip is connected with a driving end of the switch module; the second end of the current-limiting energy consumption module is connected with the first end of the energy storage module and the first end of the discharging module. The second end of the energy storage module is connected with the first end of the transformer module, and the second end of the discharge module is connected with the first end of the transformer module, so that heat generated in the circuit in each period can be reduced when the voltage of the primary winding releasing current is clamped, the use safety of the circuit is improved, and the service life of the circuit is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of circuits, and particularly relates to a clamping protection circuit. Background Art

[0002] In a circuit powered by a transformer, the transformer generally includes a primary winding and a secondary winding. It is necessary to conduct and disconnect the circuit where the primary winding is located multiple times, and drive the secondary winding to induce a voltage or current to output through the principle of electromagnetic induction. When the circuit where the primary winding is located is conducting, the primary winding will accumulate current. After the circuit where the primary winding is located is disconnected, there will be residual current in the primary winding, and the residual current will affect the normal operation of the transformer. In the prior art, an RCD (residual current operated protective device) clamping circuit is used to process the residual current of the primary winding to enable the transformer to operate normally. However, due to the simple structure of the traditional RCD clamping circuit, when the voltage input to the primary winding of the transformer is relatively large, after the circuit is disconnected, the voltage when the primary winding releases current will also cause the traditional RCD clamping circuit to generate high temperature, resulting in affecting the use safety and service life of the entire circuit. Summary of the Utility Model

[0003] The purpose of the utility model is to overcome the deficiencies in the prior art, and provide a clamping protection circuit that can reduce the heat generated in each component of the circuit when clamping the voltage when the primary winding releases current, and improve the use safety and service life of the circuit.

[0004] An embodiment of the utility model provides a clamping protection circuit, including: a transformer module, a switch module, a current-limiting and energy-consuming module, an energy storage module, a discharging module, and a control chip; the transformer module includes a first end, a second end, and a plurality of power output terminals; the control chip includes a power input terminal and a switch signal terminal;

[0005] The first end of the transformer module is connected to an input power supply, the second end of the transformer module is connected to the first end of the switch module, the second end of the switch module is grounded, and the second end of the transformer module is connected to the first end of the current-limiting and energy-consuming module; a power output terminal of the transformer module is connected to the power input terminal of the control chip, the other power output terminals of the transformer module are connected to an electrical module, and a plurality of power output terminals of the transformer module output working power to the control chip and the electrical module; the switch signal terminal of the control chip is connected to the driving end of the switch module;

[0006] The second end of the current-limiting and energy-consuming module is respectively connected to the first end of the energy storage module and the first end of the discharge module; the second end of the energy storage module is connected to the first end of the transformer module, and the second end of the discharge module is connected to the first end of the transformer module.

[0007] Compared with the prior art, in the clamping protection circuit of the present utility model, when the switch module is disconnected, causing the input power supply to stop outputting current to the transformer module due to an open circuit, and the transformer module releases the stored electrical energy, the current-limiting and energy-consuming module can cooperate to consume the electrical energy released by the transformer module, so as to reduce the electrical energy output from the transformer module to the energy storage module and the electrical energy that the discharge module needs to consume, reducing the total amount of electrical energy that the energy storage module and the discharge module need to process. When the energy storage module and the discharge module clamp the voltage when the primary winding releases current, the heat generated by multiple devices in the circuit can be reduced, improving the use safety and service life of the circuit.

[0008] In order to understand the present utility model more clearly, the specific embodiments of the present invention will be described below in conjunction with the accompanying drawings. Description of the Drawings

[0009] Figure 1 It is a schematic diagram of the module connection of the clamping protection circuit according to an embodiment of the present utility model.

[0010] Figure 2 It is a schematic diagram of the connection of the transformer module of the clamping protection circuit according to an embodiment of the present utility model.

[0011] Figure 3 It is a schematic diagram of the current-limiting and energy-consuming module of the clamping protection circuit according to an embodiment of the present utility model.

[0012] Figure 4 It is a circuit diagram of the clamping protection circuit according to an embodiment of the present utility model.

[0013] 1. Clamping protection circuit; 11. Transformer module; 12. Switch module; 13. Current-limiting and energy-consuming module; 131. Current-limiting module; 132. Energy-consuming module; 14. Energy storage module; 15. Discharge module; 16. Control chip; 2. Input power supply. Detailed Embodiments

[0014] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0015] Please refer toFigure 1 , which is a schematic diagram of the module connection of the clamping protection circuit 1 according to an embodiment of the present invention. The clamping protection circuit 1 can reduce the heat generated in each period of the circuit when clamping the voltage of the primary winding releasing current, and improve the use safety and service life of the circuit. It includes:

[0016] A transformer module 11, a switch module 12, a current-limiting and energy-consuming module 13, an energy storage module 14, a discharge module 15, and a control chip 16; the transformer module includes a first end, a second end, and several power output terminals; the control chip 16 includes a power input terminal and a switch signal terminal;

[0017] The first end of the transformer module 11 is connected to the input power supply 2, the second end of the transformer module 11 is connected to the first end of the switch module 12, the second end of the switch module 12 is grounded, and the second end of the transformer module 11 is connected to the first end of the current-limiting and energy-consuming module 13; a power output terminal of the transformer module 11 is connected to the power input terminal of the control chip 16, and the second end of the transformer module 11 is grounded; the switch signal terminal of the control chip 16 is connected to the driving end of the switch module 12;

[0018] The second end of the current-limiting and energy-consuming module 13 is respectively connected to the first end of the energy storage module 14 and the first end of the discharge module 15; the second end of the energy storage module 14 is connected to the first end of the primary winding, and the second end of the discharge module 15 is connected to the first end of the primary winding.

[0019] Please refer to Figure 2 , the transformer module 11 includes a primary winding and a secondary winding; the first end of the primary winding is the first end of the transformer module, the second end of the primary winding is the second end of the transformer module, the first end of the secondary winding is connected to the power input terminal of the control chip, and the second end of the secondary winding is grounded.

[0020] The working principle of the clamping protection circuit 1 in this embodiment is as follows: When the switch module 12 is turned on, the current output by the input power supply 2 flows to the first end of the primary winding. At this time, the primary winding stores electrical energy due to electromagnetic induction. After the primary winding stores electrical energy, the current is output from the second end of the primary winding to the first end of the switch module 12, and then flows through the switch module 12 to the ground; When the switch module 12 is turned off, the input power supply 2 stops outputting current to the first end of the primary winding. At this time, the primary winding releases the stored electrical energy, that is, the electrical energy current output from the second end of the primary winding is output to the energy storage module 14 and the discharge module 15 through the current limiting and energy consuming module 13. Among them, when the electrical energy current passes through the current limiting and energy consuming module 13, it will cause the current limiting and energy consuming module 13 to heat up to consume part of the electrical energy; The electrical energy current transmitted to the energy storage module 14 will realize the storage of electrical energy due to the charging and energy storage function of the energy storage module 14; The electrical energy current transmitted to the discharge module 15 will cause the discharge module 15 to be transmitted to the second end of the primary winding, and when the electrical energy current passes through the discharge module, the discharge module will also heat up to consume electrical energy; When the voltage at the first end of the energy storage module 14 is higher than the voltage at the second end of the primary winding, the energy storage module 14 will release the energy storage current, and the energy storage current is transmitted to the second end of the energy storage module 14 through the discharge module. When the energy storage current passes through the discharge module, the discharge module will also heat up to consume electrical energy. In the above working principle, since the current limiting and energy consuming module 13 can cooperate to consume electrical energy to reduce the total amount of electrical energy that the energy storage module 14 and the discharge module 15 need to process, the heat generated by the energy storage module 14 and the discharge module 15 can be reduced.

[0021] Compared with the prior art, for the clamping protection circuit 1 of the present utility model, when the switch module 12 is turned off, resulting in the input power supply stopping outputting current to the primary winding due to an open circuit, causing the primary winding to release the stored electrical energy, the current limiting and energy consuming module 13 can cooperate to consume the electrical energy released by the primary winding, so as to reduce the electrical energy output from the primary winding to the energy storage module 14 and the electrical energy that the discharge module 15 needs to consume, reducing the total amount of electrical energy that the energy storage module 14 and the discharge module 15 need to process. When the energy storage module 14 and the discharge module 15 clamp the voltage when the primary winding releases current, the heat generated by multiple devices in the circuit can be reduced, improving the use safety and service life of the circuit.

[0022] Please refer to Figure 3 , in one embodiment, the current limiting and energy consuming module 13 includes a current limiting module 131 and an energy consuming module 132; The first end of the current limiting module 131 is the first end of the current limiting and energy consuming module 13, the second end of the current limiting module 131 is connected to the first end of the energy consuming module 132, and the second end of the energy consuming module 132 is the second end of the current limiting and energy consuming module 13.

[0023] Among them, the current-limiting module 131 can play a role in restricting the direction of current transmission to prevent the occurrence of current backflow, which can protect the circuit. The energy-consuming module 132 can cooperate to consume electrical energy, reducing the total amount of electrical energy that the energy storage module 14 and the discharge module 15 need to process, thereby reducing the heat generated by the energy storage module 14 and the discharge module 15.

[0024] In this embodiment, by limiting the direction of current transmission through the current-limiting module 131 and reducing the heat generated by the energy storage module 14 and the discharge module 15 when the primary winding releases electrical energy through the energy-consuming module 132, the safety of the circuit operation can be improved.

[0025] Please refer to Figure 4 , in a feasible embodiment, the energy-consuming module 132 includes a plurality of energy-consuming resistors connected in parallel. The first end of each energy-consuming resistor serves as the first end of the energy-consuming module 132, and the second end of each energy-consuming resistor serves as the second end of the energy-consuming module 132.

[0026] As Figure 4 shown, the energy-consuming module 132 can include a plurality of energy-consuming resistors connected in parallel, such as resistor R8, resistor R9, and resistor R10.

[0027] In this embodiment, through a plurality of energy-consuming resistors, the amount of heat generated can be shared, and the technical effect of reducing the heat generated by each energy-consuming resistor can be achieved through joint cooperation. Connecting in parallel is beneficial to improving the flow of current to prevent the first end of the primary winding and the first end of the switch module 12 from being in a high-voltage state for a long time due to too small current.

[0028] In a feasible embodiment, the current-limiting module 131 includes a plurality of rectifier diodes connected in parallel; the positive poles of each of the parallel rectifier diodes serve as the first end of the current-limiting module 131, and the cathodes of each of the parallel rectifier diodes serve as the second end of the current-limiting module 131.

[0029] As Figure 4 shown, the current-limiting module 131 can include parallel rectifier diodes such as DS2 and DS3.

[0030] In this embodiment, through a plurality of parallel rectifier diodes, the current flowing through the current-limiting module 131 can be shunted, and when some of the parallel rectifier diodes are damaged, the circuit can continue to be protected by other parallel rectifier diodes, thereby improving the safety of the circuit.

[0031] In a feasible embodiment, the energy storage module 14 includes an energy storage capacitor. The first end of the energy storage capacitor serves as the first end of the energy storage module 14, and the second end of the energy storage capacitor serves as the second end of the energy storage module 14.

[0032] AsFigure 4 As shown, the energy storage module 14 may include an energy storage capacitor C3. When the primary winding releases electrical energy, the energy storage capacitor C3 can store the electrical energy to clamp the voltage when the primary winding releases current, prevent voltage mutation, and protect each device in the circuit.

[0033] In this embodiment, electrical energy can be stored through the energy storage capacitor to prevent voltage mutation and protect each device in the circuit.

[0034] In a feasible embodiment, the discharge module 15 includes a plurality of discharge resistors connected in parallel. The first end of each discharge resistor serves as the first end of the discharge module 15, and the second end of each discharge resistor serves as the second end of the discharge module 15.

[0035] As Figure 4 shown, the discharge module 15 may include a plurality of discharge resistors such as resistor R1, resistor R2, resistor R3, and resistor R4 connected in parallel.

[0036] In this embodiment, through the plurality of discharge resistors, the amount of heat generated can be shared, and the technical effect of jointly reducing the heat generated by each discharge resistor can be achieved. And parallel connection is beneficial to improving the flow of current to prevent the first end of the primary winding and the first end of the switch module 12 from being in a high-voltage state for a long time due to too small current.

[0037] In a feasible embodiment, the switch module 12 is a triode or a field effect transistor; the collector of the triode or the drain of the field effect transistor serves as the first end of the switch module 12, the emitter of the triode or the source of the field effect transistor serves as the second end of the switch module 12, and the base of the triode or the gate of the field effect transistor serves as the drive end of the switch module 12.

[0038] As Figure 4 shown, the switch module 12 is a field effect transistor, such as an Nmos transistor Q2. Among them, the drain of the field effect transistor serves as the first end of the switch module 12, the source of the field effect transistor serves as the second end of the switch module 12, and the gate of the field effect transistor serves as the drive end of the switch module 12. Therefore, a switch control signal can be sent to the field effect transistor through the switch signal terminal of the control chip 16 to control the conduction or disconnection of the field effect transistor, so as to control the on-off of the circuit where the primary winding is located, so that the transformer can continuously supply power to other power-consuming modules. Among them, an NPN triode can be used instead of the Nmos transistor Q2.

[0039] Among them, it should be noted that the control chip 16 also includes a start pin. The control chip 16 is connected to a start circuit. When the user needs to start the control chip 16, the start circuit temporarily supplies power to the control chip, enabling the control chip 16 to start and send a switch control signal to the field-effect transistor through the switch signal terminal, controlling the conduction or disconnection of the field-effect transistor to control the on / off of the circuit where the primary winding is located, so that the transformer can supply power to the power-consuming modules including the control chip, and the control chip 16 continues to operate based on the power supply of the transformer to continue sending a switch control signal to the field-effect transistor through the switch signal terminal.

[0040] In this embodiment, the on / off of the circuit where the primary winding is located can be controlled by a triode or a field-effect transistor, so that the transformer can continuously supply power to other power-consuming modules.

[0041] In a feasible embodiment, the first end of the secondary winding of the transformer module 11 is connected to the power input terminal of the control chip 16 via a diode.

[0042] As Figure 4 shown, the control chip 16 is the power control chip U2. The first end of the secondary winding is connected to the power input terminal VCC of the power control chip U2 via the diode DS4. The diode DS4 can prevent the reverse flow of current to improve the stability of the power supply of the secondary winding of the transformer module 11 to the power control chip U2.

[0043] In a feasible embodiment, the power input terminal of the control chip 16 is grounded via a plurality of capacitors.

[0044] As Figure 4 shown, the power input terminal of the control chip 16 is grounded via a plurality of capacitors such as the capacitor C6 and the capacitor CE2. Therefore, when the secondary winding of the transformer module 11 supplies power to the power control chip U2, the capacitor C6 and the capacitor CE2 can play a filtering role to increase the stability of the voltage input to the power input terminal VCC of the power control chip U2, and the capacitor C6 and the capacitor CE2 can also play a role in energy storage and can supply power to the power control chip U2 when the secondary winding stops supplying power to the power control chip U2.

[0045] In a feasible embodiment, the first end of the secondary winding of the transformer module 11 is connected to the power input terminal of the control chip 16 via a series resistor.

[0046] As Figure 4 shown, the first end of the secondary winding of the transformer module 11 is connected to the power input terminal of the control chip 16 via the series resistor R14. The series resistor R14 can act as a load to prevent the circuit from short-circuiting and improve the safety of the circuit.

[0047] Although embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A clamping protection circuit, characterized in that, It includes: a transformer module, a switch module, a current-limiting energy-consuming module, an energy storage module, a discharge module, and a control chip; the transformer module includes a first end, a second end, and several power output terminals; the control chip includes a power input terminal and a switch signal terminal; The first end of the transformer module is connected to an input power supply, the second end of the transformer module is connected to the first end of the switch module, the second end of the switch module is grounded, and the second end of the transformer module is connected to the first end of the current-limiting energy-consuming module; one power output terminal of the transformer module is connected to the power input terminal of the control chip, the other power output terminals of the transformer module are connected to an electrical load module, and several power output terminals of the transformer module output working power to the control chip and the electrical load module; the switch signal terminal of the control chip is connected to the driving end of the switch module; The second end of the current-limiting energy-consuming module is respectively connected to the first end of the energy storage module and the first end of the discharge module; the second end of the energy storage module is connected to the first end of the transformer module, and the second end of the discharge module is connected to the first end of the transformer module.

2. The clamping protection circuit according to claim 1, wherein: The current-limiting energy-consuming module includes a current-limiting module and an energy-consuming module; The first end of the current-limiting module is the first end of the current-limiting energy-consuming module, the second end of the current-limiting module is connected to the first end of the energy-consuming module, and the second end of the energy-consuming module is the second end of the current-limiting energy-consuming module.

3. The clamping protection circuit according to claim 2, wherein: The energy-consuming module includes a plurality of energy-consuming resistors connected in parallel, the first end of each energy-consuming resistor is used as the first end of the energy-consuming module, and the second end of each energy-consuming resistor is used as the second end of the energy-consuming module.

4. The clamping protection circuit according to claim 2, wherein: The current-limiting module includes a plurality of rectifying diodes connected in parallel; the positive electrode of each parallel rectifying diode is used as the first end of the current-limiting module, and the cathode of each parallel rectifying diode is used as the second end of the current-limiting module.

5. The clamping protection circuit according to claim 1, characterized in that: The energy storage module includes an energy storage capacitor, the first end of the energy storage capacitor is used as the first end of the energy storage module, and the second end of the energy storage capacitor is used as the second end of the energy storage module.

6. The clamping protection circuit according to claim 1, wherein: The discharge module includes a plurality of discharge resistors connected in parallel, the first end of each discharge resistor is used as the first end of the discharge module, and the second end of each discharge resistor is used as the second end of the discharge module.

7. The clamping protection circuit according to claim 1, characterized in that: The switch module is a triode or a field-effect transistor; the collector of the triode or the drain of the field-effect transistor is used as the first end of the switch module, the emitter of the triode or the source of the field-effect transistor is used as the second end of the switch module, and the base of the triode or the gate of the field-effect transistor is used as the driving end of the switch module.

8. The clamping protection circuit according to claim 1, wherein: The transformer module includes a primary winding and a secondary winding; the first end of the primary winding is the first end of the transformer module, the second end of the primary winding is the second end of the transformer module, the first end of the secondary winding is connected to the power input terminal of the control chip, and the second end of the secondary winding is grounded.

9. The clamping protection circuit according to claim 8, wherein: The first end of the secondary winding of the transformer module is connected to the power input terminal of the control chip via a diode.

10. The clamping protection circuit according to claim 1, wherein: The power input terminal of the control chip is grounded via a plurality of capacitors.

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