CN217388226U - Protection circuit and electronic equipment - Google Patents

Abstract

The embodiment of the utility model discloses protection circuit and electronic equipment. The protection circuit can solve the problems of damage of protected equipment, even risk of system fire accidents and the like caused by multiple surge impacts or overheating after frequent overvoltage operation in the prior art, the first end of the first discharge circuit is connected with the tripping device through a first welding point, the first end of the second discharge circuit is connected with the tripping device through a second welding point, it can be realized that when the line is subjected to a plurality of surge impacts or the line is overheated due to frequent operation overvoltage, when the temperature reaches the melting point of the first welding point and/or the second welding point, the first discharge circuit and the second discharge circuit are connected, and/or the first discharge circuit is disconnected from the third discharge circuit, and/or the second discharge circuit is disconnected from the third discharge circuit, preventing further damage to the circuit to be protected or the protected equipment.

Description

Protection circuit and electronic equipment

Technical Field

The embodiment of the utility model provides a relate to circuit protection technical field, especially relate to a protection circuit and electronic equipment.

Background

The multi-stage gas discharge tube in the prior art adopts a capacitance or voltage-sensitive ignition circuit, the ignition circuit in the prior art has obvious potential safety hazard, and is mainly free of a thermal protection or separation device, when a circuit is subjected to multiple surge impacts or frequent operation overvoltage, the discharge tube is broken down and short-circuited after frequent action, the protected equipment is damaged, and even the risk of system fire accidents is caused.

SUMMERY OF THE UTILITY MODEL

The utility model provides a protection circuit and electronic equipment to the realization carries out the thermal protection to protection circuit, avoids appearing overheated leading to being damaged by protection equipment, and causes system fire accident etc..

In a first aspect, an embodiment of the present invention provides a protection circuit, which includes: the tripping device comprises a first discharging circuit, a second discharging circuit, a third discharging circuit and a tripping device; the first end of the first discharge circuit is connected with the tripping device through a first welding point, and the second end of the first discharge circuit is connected with the first end of the circuit to be protected; the first end of the second discharge circuit is connected with the tripping device through a second welding point, and the second end of the second discharge circuit is connected with the second end of the circuit to be protected; the first end of the third discharging circuit is connected with the tripping device, and the second end of the third discharging circuit is grounded;

wherein the first discharge circuit is disconnected from the second discharge circuit and/or the first discharge circuit from the third discharge circuit when the temperature of the first bonding pad reaches its melting point; when the temperature of the second welding point reaches the melting point of the second welding point, the second discharge circuit is disconnected with the first discharge circuit and/or the second discharge circuit is disconnected with the third discharge circuit.

Optionally, the trip device at least comprises: the first tripping tension spring mechanism and the second tripping tension spring mechanism; the first tripping tension spring mechanism is connected with the first discharge circuit through the first welding point and is connected with the third discharge circuit through a third welding point; the second tripping tension spring mechanism is connected with the second discharge circuit through the second welding point and is connected with the third discharge circuit through the third welding point.

Optionally, the first discharge circuit, the second discharge circuit, the third discharge circuit and the trip device are arranged on the front surface of the PCB substrate; the tripping device comprises a support frame, wherein the support frame is of an opposite double-V-shaped structure; the first tripping tension spring mechanism comprises a first spring and a first V-shaped structure, and the second tripping tension spring mechanism comprises a second spring and a second V-shaped structure; the support frame is connected with the first discharge circuit through the first welding point, connected with the second discharge circuit through the second welding point and connected with the third discharge circuit through the third welding point; the both ends of first V type structure are connected first welding point with between the third welding point, the both ends of second V type structure are connected the second welding point with between the third welding point, first spring both ends elastic stretching fixes between the both ends of first V type structure, second spring both ends elastic stretching fixes between the both ends of second V type structure.

Optionally, the first discharge circuit, the second discharge circuit, and the third discharge circuit each include: two ends of the at least two switching-type devices after being connected in series are respectively and electrically connected with the first end and the second end of the discharge circuit; the impedance branches are in one-to-one correspondence with the switching device devices and are connected in parallel with the corresponding switching device devices.

Optionally, the impedance branch comprises: one or more combinations of resistive, inductive and capacitive elements.

Optionally, the protection circuit further includes a trip signal detection module, a first input end of the trip signal detection module is electrically connected to a first end of the circuit to be protected, a second input end of the trip signal detection module is electrically connected to a second end of the circuit to be protected, and an output end of the trip signal detection module is connected to an upper computer.

Optionally, the trip signal detection module includes: the device comprises a first tripping detection unit, a second tripping detection unit and an isolation unit; the first end of the first tripping detection unit is electrically connected with the first end of the circuit to be protected, the second end of the first tripping detection unit is electrically connected with the first end of the isolation unit, and the third end of the first tripping detection unit is electrically connected with the second end of the second tripping detection unit and the second end of the isolation unit respectively; the first end of the second tripping detection unit is electrically connected with the second end of the circuit to be protected, and the second end of the second tripping detection unit is electrically connected with the second end of the isolation unit.

Optionally, the isolation unit is an optocoupler.

Optionally, the first trip detection unit at least includes a first diode and a first resistive element; the second trip detection unit includes at least a second resistive element and a second diode.

In a second aspect, an embodiment of the present invention further provides an electronic device, which includes the protection circuit as described in the first aspect.

The utility model provides a protection circuit and electronic equipment, through this protection circuit can solve the problem that the prior art has many times surge impact or overheat after frequently operating overvoltage and causes the protected equipment to damage, even causes the risk of system fire accident, through setting up first discharge circuit, second discharge circuit, third discharge circuit and trip device, can realize when the circuit to be protected appears surge or overvoltage, and through connecting the first end of first discharge circuit with trip device through the first welding point, the first end of second discharge circuit is connected with trip device through the second welding point, can realize when the circuit receives many times surge impact or frequently operating overvoltage and appears overheat, because the circuit overheat leads to the temperature rise, when the temperature reaches the melting point of first welding point and/or second welding point, and the first discharge circuit and the second discharge circuit, and/or the first discharge circuit and the third discharge circuit, and/or the second discharge circuit and the third discharge circuit are disconnected, so that the circuit to be protected or the protected equipment is prevented from being further damaged.

Drawings

Fig. 1 is a block diagram of a protection circuit according to a first embodiment of the present invention;

fig. 2 is a schematic structural diagram of a protection circuit according to a second embodiment of the present invention;

fig. 3 is an enlarged schematic structural view of the trip device in fig. 2;

fig. 4 is a schematic front view of a protection circuit integrated structure according to a second embodiment of the present invention;

fig. 5 is a schematic reverse side view of a protection circuit integrated structure according to a second embodiment of the present invention;

fig. 6 is a schematic structural diagram of a protection circuit in a third embodiment of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures associated with the present invention are shown in the drawings, not all of them.

Example one

Fig. 1 is a block diagram of a protection circuit according to a first embodiment of the present invention. Referring to fig. 1, the protection circuit includes: the first discharge circuit 10, the second discharge circuit 20, the third discharge circuit 30 and the trip device 40; the first end a1 of the first discharge circuit 10 is connected to the trip device 40 through a first welding point a, and the second end a2 is connected to the first end E1 of the circuit to be protected 50; the first end B1 of the second discharge circuit 20 is connected to the trip device 40 through a second welding point B, and the second end B2 is connected to the second end E2 of the circuit to be protected 50; the first end C1 of the third discharging circuit 30 is connected with the tripping device 40, and the second end C2 is grounded;

when the temperature of the first welding point A reaches the melting point, the first discharge circuit 10 is disconnected from the second discharge circuit 20, and/or the first discharge circuit 10 is disconnected from the third discharge circuit 30; when the temperature of the second welding point B reaches its melting point, the second discharge circuit 20 is disconnected from the first discharge circuit 10, and/or the second discharge circuit 20 is disconnected from the third discharge circuit 30.

The protection circuit can be applied to a surge protection circuit or an ignition circuit. Exemplarily, fig. 1 exemplarily shows a case where the protection circuit is applied to surge protection of a single-phase ac circuit. Specifically, the first end E1 of the circuit to be protected 50 and the second end a2 of the first discharge circuit 10 are both electrically connected to the first ac power supply line, the second end E2 of the circuit to be protected 50 and the second end B2 of the second discharge circuit 20 are both electrically connected to the second ac power supply line, and the second end C2 of the third discharge circuit 30 is connected to the ground line PE. Wherein the first ac supply line may be live line L and the second ac supply line may be neutral line N.

Wherein the trip device 40 has a certain pulling force or pulling-off effect. For example, when the temperature of the first welding point a reaches its melting point, the first welding point a melts, and the first welding point a is pulled by the trip device 40, so that the first end a1 of the first discharge circuit 10 is disconnected from the trip device 40, and the first discharge circuit 10 is disconnected from the second discharge circuit 20, and/or the first discharge circuit 10 is disconnected from the third discharge circuit 30. When the temperature of the second welding point B reaches its melting point, the second welding point B melts, and the second welding point B is pulled by the trip device 40, so that the first end B1 of the second discharge circuit 20 is disconnected from the trip device 40, and the second discharge circuit 20 is disconnected from the first discharge circuit 10, and/or the second discharge circuit 20 is disconnected from the third discharge circuit 30.

Surge current may be generated between any two of the first discharge circuit 10, the second discharge circuit 20, and the third discharge circuit 30, and when the surge current causes overheating and the line temperature rises to the melting point of the first welding point a and/or the second welding point B, the first welding point a and/or the second welding point B may be pulled off by the trip device 40, so that the corresponding circuit is disconnected. For example, a surge current may be generated between the first discharge circuit 10 and the third discharge circuit 30, and when the surge current causes overheating and the temperature of the line rises to the melting point of the first welding point a, the first welding point a is pulled off by the trip device 40, so that the first discharge circuit 10 is electrically disconnected from the third discharge circuit 30, and further damage to the protected circuit can be prevented; surge current may be generated between the second discharge circuit 20 and the third discharge circuit 30, and when the surge current causes overheating and the line temperature rises to the melting point of the second welding point B, the second welding point B is pulled off by the trip device 40, so that the second discharge circuit 20 is electrically disconnected from the third discharge circuit 30, and further damage to the protected circuit can be prevented; surge current may be generated between the first discharge circuit 10 and the second discharge circuit 20, and when the surge current causes overheating and the line temperature rises to the melting point of the first welding point a and/or the second welding point B, the first welding point a and/or the second welding point B may be pulled off by the trip device 40, so that the first discharge circuit 10 is electrically disconnected from the second discharge circuit 20, and further damage to the protected circuit may be prevented.

In the technical solution of this embodiment, the implementation process of the protection circuit is as follows: referring to fig. 1, in a normal situation, the temperature of the line may not reach the melting points of the first welding point a and the second welding point B, the first end a1 of the first discharging circuit 10 may be electrically connected to the trip device 40 through the first welding point a, and the first end B1 of the second discharging circuit 20 may be electrically connected to the trip device 40 through the second welding point B, that is, the first discharging circuit 10 is electrically connected to the second discharging circuit 20 and the third discharging circuit 30 through the trip device 40, respectively, and when a surge or overvoltage occurs in the line, the surge or overvoltage protection of the circuit to be protected 50 may be achieved through the first discharging circuit 10, the second discharging circuit 20, and the third discharging circuit 30. However, when the line is subjected to multiple surge impacts or frequent operation overvoltages, a large surge current or even breakdown is easily caused after the discharge circuit is frequently operated, so that the temperature of the line is sharply increased, and when the temperature is increased to the melting point of the first welding point a and/or the second welding point B, the first welding point a and/or the second welding point B is/are melted, and due to the pulling-off action of the tripping device, the first welding point a and/or the second welding point B are/is pulled off, so that the first discharge circuit and the second discharge circuit, and/or the first discharge circuit and the third discharge circuit, and/or the second discharge circuit and the third discharge circuit are/is disconnected, so that the circuit to be protected or the protected equipment can be prevented from being further damaged.

In the technical scheme of the embodiment, a protection circuit is provided, and the protection circuit comprises a first discharge circuit, a second discharge circuit, a third discharge circuit and a tripping device; the first end of the first discharge circuit is connected with the tripping device through a first welding point, and the second end of the first discharge circuit is connected with the first end of the circuit to be protected; the first end of the second discharge circuit is connected with the tripping device through a second welding point, and the second end of the second discharge circuit is connected with the second end of the circuit to be protected; the first end of the third discharging circuit is connected with the tripping device, and the second end of the third discharging circuit is grounded; when the temperature of the first welding point reaches the melting point of the first welding point, the first discharge circuit and the second discharge circuit are disconnected, and/or the first discharge circuit and the third discharge circuit are disconnected; when the temperature of the second welding point reaches the melting point of the second welding point, the second discharge circuit is disconnected with the first discharge circuit and/or the second discharge circuit is disconnected with the third discharge circuit. The protection circuit can solve the problems of damage of protected equipment and even fire accident risk of a system caused by overheating after multiple surge impacts or frequent overvoltage operations in the prior art, and can protect the circuit to be protected when the circuit to be protected surges or overvoltage occurs by arranging the first discharge circuit, the second discharge circuit, the third discharge circuit and the tripping device, and can realize that when the circuit is impacted by multiple surges or overvoltage occurs overheating due to frequent operations, the temperature rises due to overheating of the circuit when the circuit is impacted by multiple surges or the tripping device occurs overheating due to overheating of the circuit, and when the temperature reaches the melting point of the first welding point and/or the second welding point, the first discharge circuit and the second discharge circuit are connected, and/or the first discharge circuit is disconnected from the third discharge circuit, and/or the second discharge circuit is disconnected from the third discharge circuit, preventing further damage to the circuit to be protected or the protected equipment.

Example two

Fig. 2 is a schematic structural diagram of a protection circuit provided in the second embodiment of the present invention, fig. 3 is an enlarged schematic structural diagram of a tripping device in fig. 2, fig. 4 is a schematic front view of a protection circuit integrated structure provided in the second embodiment of the present invention, and fig. 5 is a schematic reverse view of a protection circuit integrated structure provided in the second embodiment of the present invention. On the basis of the first embodiment, optionally, referring to fig. 2 and 3, the trip device 40 at least includes: a first tripping tension spring mechanism K1 and a second tripping tension spring mechanism K2; the first tripping tension spring mechanism K1 is connected with the first discharge circuit 10 through a first welding point a and connected with the third discharge circuit 30 through a third welding point C; the second tripping tension spring mechanism K2 is connected to the second discharging circuit 20 through a second welding point B, and is connected to the third discharging circuit 30 through a third welding point C.

The first tripping tension spring mechanism K1 and the second tripping tension spring mechanism K2 have certain pulling-out functions. Under normal conditions, the temperature of the circuit cannot reach the melting points of the first welding point a and the second welding point B, the first end a1 of the first discharge circuit 10 is connected with the first tripping tension spring mechanism K1 through the first welding point a, the first tripping tension spring mechanism K1 is connected with the third discharge circuit 30 through the third welding point C, and the first tripping tension spring mechanism K1 is compressed between the first discharge circuit 10 and the third discharge circuit 30; similarly, the first end B1 of the second discharge circuit 20 is connected to the second trip tension spring mechanism K2 through a second welding point B, the second trip tension spring mechanism K2 is connected to the third discharge circuit 30 through a third welding point C, and the second trip tension spring mechanism K2 is compressed between the second discharge circuit 20 and the third discharge circuit 30. However, when the temperature of the first welding point a reaches its melting point, the first welding point a melts, and the first end a1 of the first discharge circuit 10 is disconnected from the first release tension spring mechanism K1 due to the first welding point a being pulled by the first release tension spring mechanism K1, so that the first discharge circuit 10 is disconnected from the second discharge circuit 20, and/or the first discharge circuit 10 is disconnected from the third discharge circuit 30. When the temperature of the second welding point B reaches its melting point, the second welding point B melts, and the second welding point B is pulled by the second trip tension spring mechanism K2, so that the first end B1 of the second discharge circuit 20 is disconnected from the second trip tension spring mechanism K2, and the second discharge circuit 20 is disconnected from the first discharge circuit 10, and/or the second discharge circuit 20 is disconnected from the third discharge circuit 30.

Alternatively, referring to fig. 2 to 5, the first discharge circuit 10, the second discharge circuit 20, the third discharge circuit 30 and the trip device 40 are disposed on the front surface of the PCB substrate 1; the tripping device 40 comprises a support frame 11, wherein the support frame 11 is of an opposite double-V-shaped structure; the first tripping tension spring mechanism K1 comprises a first spring 21 and a first V-shaped structure, and the second tripping tension spring mechanism K2 comprises a second spring 22 and a second V-shaped structure; the support frame 11 is connected with the first discharge circuit 10 through a first welding point, connected with the second discharge circuit 20 through a second welding point, and connected with the third discharge circuit 30 through a third welding point; the both ends of first V type structure are connected between first welding point and third welding point, and the both ends of second V type structure are connected between second welding point and third welding point, and first spring 21 both ends elastic stretching fixes between the both ends of first V type structure, and second spring 22 both ends elastic stretching fixes between the both ends of second V type structure.

Wherein, set up support frame 11 to be the two opposite V type structures, and set up the first V type structure of support frame 11 between first discharge circuit 10 and third discharge circuit 30, set up the second V type structure of support frame 11 between second discharge circuit 20 and third discharge circuit 30, can reduce the volume of first dropout extension spring mechanism K1 and second dropout extension spring mechanism K2, be favorable to saving space, and then reduce the volume of whole protection circuit board, reduce the cost. The angle at which the first V-shaped structure and the second V-shaped structure are designed to be V-shaped can be set according to actual conditions, and is not particularly limited herein.

Referring to fig. 4, the joint of the first V-shaped structure and the second V-shaped structure is a "Z" shaped structure, as indicated by the arrow in fig. 4, and the "Z" shaped structure acts as a position-limiting and fixing function. In addition, the first V-shaped structure and the second V-shaped structure may be integrally formed or may be separately formed.

Referring to fig. 5, the connection end of the first discharge circuit 10 and the live wire L, the connection end of the second discharge circuit 20 and the zero wire N, and the connection end of the third discharge circuit 30 and the ground wire PE are disposed on the same side of the PCB substrate 1, that is, the back side, so that wiring can be facilitated, and the circuit clutter can be avoided.

Optionally, the melting points of the first welding point a and the second welding point B are: the surge current between the first discharge circuit 10 and the second discharge circuit 20, between the first discharge circuit 10 and the third discharge circuit 30, and between the second discharge circuit 20 and the third discharge circuit 30 reaches a preset temperature corresponding to a preset current.

The preset current and the preset temperature can be set according to actual conditions, and are not specifically limited herein.

The melting points of the first welding point a and the second welding point B are the same, but the melting points of the first welding point a and the third welding point C may be the same or different. The materials of the first welding point a, the second welding point B and the third welding point C may be the same or different. The material of the first pad a and the second pad B may be solder material.

Optionally, the first discharge circuit, the second discharge circuit and the third discharge circuit each include: the two ends of the at least two switching-type devices after being connected in series are respectively and electrically connected with the first end and the second end of the discharge circuit; the impedance branches correspond to the switching devices one by one, and the impedance branches are connected with the corresponding switching devices in parallel.

The switching device package may be a gas discharge tube, a semiconductor discharge tube, an air gap, a graphite gap, a spark gap, or the like. The number of switching devices and the number of corresponding impedance branches included in each discharge circuit may be set according to actual conditions, and are not specifically limited herein.

Optionally, the impedance branch comprises: one or more combinations of resistive, inductive and capacitive elements.

The resistive element may include a resistor, among other things. The inductive element may comprise an inductance; the inductor can be a magnetic bead inductor, and compared with a common inductor, the inductor is small in size and low in cost. The capacitive element may comprise at least one of: capacitance and elements with inter-pole capacitance. The element with inter-pole capacitance may comprise a varistor or a transient suppression diode.

Illustratively, taking the switching type device as a gas discharge tube as an example, fig. 2 exemplarily shows a case where each discharge circuit includes 5 gas discharge tubes, the impedance branch is a capacitive element, and the capacitive element and the resistive element are combined. Referring to fig. 2, the first discharge circuit 10 includes a first discharge tube F1, a second discharge tube F2, a third discharge tube F3, a fourth discharge tube F4, a fifth discharge tube F5, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a first resistor R1, and a second resistor R2. The first resistor R1 is connected in series with the first capacitor C1 and then connected in parallel with the first discharge tube F1, the second capacitor C2 is connected in parallel with the second discharge tube F2, the third capacitor C3 is connected in parallel with the third discharge tube F3, the fourth capacitor C4 is connected in parallel with the fourth discharge tube F4, and the fifth capacitor C5 is connected in parallel with the fifth discharge tube F5.

The second discharge circuit 20 includes a sixth discharge tube F6, a seventh discharge tube F7, an eighth discharge tube F8, a ninth discharge tube F9, a tenth discharge tube F10, a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9, a tenth capacitor C10, an eleventh capacitor C11, and a third resistor R3. The sixth capacitor C6 is connected in parallel with the sixth discharge tube F6, the seventh capacitor C7 is connected in parallel with the seventh discharge tube F7, the eighth capacitor C8 is connected in parallel with the eighth discharge tube F8, the ninth capacitor C5 is connected in parallel with the ninth discharge tube F9, and the third resistor R3 is connected in series with the tenth capacitor C10 and then connected in parallel with the tenth discharge tube F10.

The third discharge circuit 30 includes an eleventh discharge tube F11, a twelfth discharge tube F12, a thirteenth discharge tube F13, a fourteenth discharge tube F14, a fifteenth discharge tube F15, a twelfth capacitor C12, a thirteenth capacitor C13, a fourteenth capacitor C14, a fifteenth capacitor C15, a sixteenth capacitor C16, and a fourth resistor R4. The twelfth capacitor C12 is connected in parallel with the eleventh discharge tube F11, the thirteenth capacitor C13 is connected in parallel with the twelfth discharge tube F12, the fourteenth capacitor C14 is connected in parallel with the thirteenth discharge tube F13, the fifteenth capacitor C15 is connected in parallel with the fourteenth discharge tube F14, and the fourth resistor R4 is connected in series with the sixteenth capacitor C16 and then connected in parallel with the fifteenth discharge tube F15.

EXAMPLE III

Fig. 6 is a schematic structural diagram of a protection circuit provided in the third embodiment of the present invention. On the basis of the above embodiment, optionally, referring to fig. 6, the protection circuit 100 further includes a trip signal detection module 60, a first input end of the trip signal detection module 60 is electrically connected to the first end E1 of the circuit 50 to be protected, a second input end of the trip signal detection module is electrically connected to the second end E2 of the circuit 50 to be protected, and an output end of the trip signal detection module is connected to an upper computer.

For example, taking the protection circuit applied to the surge protection of a single-phase ac circuit as an example, the first end E1 of the circuit to be protected 50, the second end of the first discharging circuit 10, and the first input end of the trip signal detecting module 60 are all electrically connected to the live line L; the second end E2 of the circuit to be protected 50, the second end of the second discharging circuit 20, and the second input end of the trip signal detecting module 60 are all electrically connected to the neutral line N.

The trip signal detection module 60 is configured to detect whether the first welding point and/or the second welding point is pulled off by the trip device, and send a signal to the upper computer when the first welding point and/or the second welding point is detected to be pulled off, so as to prompt related personnel to perform corresponding processing, for example, to replace a discharge tube damaged by pulling off.

Optionally, with continued reference to fig. 6, the trip signal detection module 60 includes: a first trip detection unit 61, a second trip detection unit 62 and an isolation unit 63; a first end of the first trip detection unit 61 is electrically connected to the first end E1 of the circuit 50 to be protected, a second end is electrically connected to the first end of the isolation unit 63, and a third end is electrically connected to the second end of the second trip detection unit 62 and the second end of the isolation unit 63, respectively; the first end of the second trip detecting unit 62 is electrically connected to the second end of the circuit to be protected 50, and the second end is electrically connected to the second end of the isolating unit 63.

When the first welding point is pulled off, the first discharge circuit 10 and the second discharge circuit 20, and/or the first discharge circuit 10 and the third discharge circuit 30 are disconnected, and the first trip detection unit 61 detects a level change signal, for example, a low level signal, and outputs the level change signal to an upper computer after the isolation action of the isolation unit 63, so as to prompt related personnel. When the second welding point is pulled off, the first discharging circuit 10 and the second discharging circuit 20, and/or the second discharging circuit 20 and the third discharging circuit 30 are disconnected, and the second trip detecting unit 62 detects a level change signal, for example, a low level signal, and outputs the level change signal to the upper computer after the isolation action of the isolating unit 63, so as to prompt related personnel.

Optionally, the isolation unit 63 is an optocoupler U0.

Wherein, the first input end of opto-coupler U0 is connected with first dropout detecting element 61 electricity, and the second input end of opto-coupler U0 is connected with first dropout detecting element 61 and second dropout detecting element 62 electricity respectively, and the first output enable end SEN1 and the second output enable end SEN2 of opto-coupler U0 are connected with the host computer.

Optionally, with continued reference to fig. 6, the first trip detecting unit 61 includes at least a first diode D1 and a first resistive element R01; the second trip detecting unit 62 includes at least a second resistive element R02 and a second diode D2.

A first end of the first resistive element R01 is electrically connected to the live line L, and a second end of the first resistive element R01 is electrically connected to an anode of the first diode D1 and a first input end of the optocoupler U0, respectively; an anode of the second diode D2 is electrically connected to the neutral line N, a cathode of the second diode D2 is electrically connected to a first end of the second resistive element R02, and a second end of the second resistive element R02 is electrically connected to a cathode of the first diode D1 and a second input end of the optocoupler U0, respectively.

It should be noted that, the trip signal detection module can be integrated at the front of the PCB substrate 1 shown in fig. 4, and the first output enable end SEN1 and the second output enable end SEN2 of the optical coupler U0 can be disposed at the back of the PCB substrate 1 shown in fig. 5, namely the first output enable end SEN1 and the second output enable end SEN2 of the optical coupler U0, and the connection end of the first discharge circuit 10 and the live wire L, the connection end of the second discharge circuit 20 and the zero wire N, the connection end of the third discharge circuit 30 and the ground wire PE is disposed at the same face of the PCB substrate 1, namely, the back, which can facilitate wiring and avoid the disordered interference of circuits.

Example four

The embodiment of the utility model provides an in four, this electronic equipment includes the utility model discloses arbitrary embodiment provides a protection circuit.

The electronic device can be a television, a notebook computer, an air conditioner, a communication power supply, a camera, a network switch and the like. The embodiment of the utility model provides an electronic equipment includes the protection circuit in the above-mentioned embodiment, consequently the embodiment of the utility model provides an electronic equipment also possesses the beneficial effect that describes in the above-mentioned embodiment, and here is no longer described any more.

It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.

Claims (10)

1. A protection circuit, comprising: the tripping device comprises a first discharging circuit, a second discharging circuit, a third discharging circuit and a tripping device; the first end of the first discharge circuit is connected with the tripping device through a first welding point, and the second end of the first discharge circuit is connected with the first end of the circuit to be protected; the first end of the second discharge circuit is connected with the tripping device through a second welding point, and the second end of the second discharge circuit is connected with the second end of the circuit to be protected; the first end of the third discharging circuit is connected with the tripping device, and the second end of the third discharging circuit is grounded;

when the temperature of the first welding point reaches the melting point of the first welding point, the first discharge circuit is disconnected with the second discharge circuit and/or the first discharge circuit is disconnected with the third discharge circuit; when the temperature of the second welding point reaches the melting point of the second welding point, the second discharge circuit is disconnected with the first discharge circuit and/or the second discharge circuit is disconnected with the third discharge circuit.

2. The protection circuit according to claim 1, wherein the trip device comprises at least: the first tripping tension spring mechanism and the second tripping tension spring mechanism; the first tripping tension spring mechanism is connected with the first discharge circuit through the first welding point and is connected with the third discharge circuit through a third welding point; the second tripping tension spring mechanism is connected with the second discharge circuit through the second welding point and is connected with the third discharge circuit through the third welding point.

3. The protection circuit of claim 2, wherein the first discharge circuit, the second discharge circuit, the third discharge circuit and the trip device are disposed on a front surface of a PCB substrate; the tripping device comprises a support frame, wherein the support frame is of an opposite double-V-shaped structure; the first tripping tension spring mechanism comprises a first spring and a first V-shaped structure, and the second tripping tension spring mechanism comprises a second spring and a second V-shaped structure; the support frame is connected with the first discharge circuit through the first welding point, connected with the second discharge circuit through the second welding point and connected with the third discharge circuit through the third welding point; the two ends of the first V-shaped structure are connected between the first welding point and the third welding point, the two ends of the second V-shaped structure are connected between the second welding point and the third welding point, the elastic stretching of the two ends of the first spring is fixed between the two ends of the first V-shaped structure, and the elastic stretching of the two ends of the second spring is fixed between the two ends of the second V-shaped structure.

4. The protection circuit of claim 1, wherein the first discharge circuit, the second discharge circuit, and the third discharge circuit each comprise: two ends of the at least two switching-type devices after being connected in series are respectively and electrically connected with the first end and the second end of the discharge circuit; the impedance branches are in one-to-one correspondence with the switching device devices and are connected in parallel with the corresponding switching device devices.

5. The protection circuit of claim 4, wherein the impedance branch comprises: one or more combinations of resistive, inductive and capacitive elements.

6. The protection circuit according to claim 1, further comprising a trip signal detection module, wherein a first input terminal of the trip signal detection module is electrically connected to a first terminal of the circuit to be protected, a second input terminal of the trip signal detection module is electrically connected to a second terminal of the circuit to be protected, and an output terminal of the trip signal detection module is connected to an upper computer.

7. The protection circuit of claim 6, wherein the trip signal detection module comprises: the device comprises a first tripping detection unit, a second tripping detection unit and an isolation unit; the first end of the first tripping detection unit is electrically connected with the first end of the circuit to be protected, the second end of the first tripping detection unit is electrically connected with the first end of the isolation unit, and the third end of the first tripping detection unit is electrically connected with the second end of the second tripping detection unit and the second end of the isolation unit respectively; the first end of the second tripping detection unit is electrically connected with the second end of the circuit to be protected, and the second end of the second tripping detection unit is electrically connected with the second end of the isolation unit.

8. The protection circuit of claim 7, wherein the isolation unit is an optocoupler.

9. The protection circuit of claim 7, wherein the first trip detection unit includes at least a first diode and a first resistive element; the second trip detection unit includes at least a second resistive element and a second diode.

10. An electronic device characterized by comprising a protection circuit according to any one of claims 1 to 9.

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