Fire extinguishing device, electrical box and electronic equipment

Abstract

The embodiment of the invention provides a fire extinguishing device, an electrical box and electronic equipment, the fire extinguishing device is arranged above a circuit board of the electrical box, and the fire extinguishing device comprises a fire extinguishing agent storage bin provided with a valve; a fire extinguishing agent is stored in the fire extinguishing agent storage bin, and the valve faces the circuit board of the electrical box. The storage bin control circuit is connected with the valve; the storage bin control circuit is used for opening the valve when it is detected that the temperature of the circuit board of the electrical box exceeds a preset value. And a fire extinguishing agent stored in the fire extinguishing agent storage bin moves from the interior of the fire extinguishing agent storage bin to the circuit board of the electrical box when the valve is opened. According to the embodiment of the invention, the fire can be extinguished at the initial stage of the fire on the circuit board of the electrical box, so that the fire on the circuit board is prevented from causing a larger fire.

Description

Technical Field

[0001] The invention relates to the technical field of circuit board protection, in particular to a fire extinguishing device, an electrical box and an electronic device. Background Art

[0002] As people's living standards improve, many families have a variety of household appliances. During the operation of household appliances, the circuit boards of the appliances may catch fire due to abnormalities. If the user fails to discover it in time, it may cause a fire. Summary of the invention

[0003] In view of the above problems, a fire extinguishing device, an electrical box and an electronic device are proposed to overcome the above problems or at least partially solve the above problems, including:

[0004] A fire extinguishing device is arranged above a circuit board of an electrical box, and comprises:

[0005] The fire extinguishing agent storage bin is provided with a valve; the fire extinguishing agent is stored inside the fire extinguishing agent storage bin, and the valve faces the circuit board of the electrical box;

[0006] A storage bin control circuit is connected to the valve; the storage bin control circuit is used to open the valve when it is detected that the temperature of the circuit board of the electrical box exceeds a preset value; the fire extinguishing agent stored inside the fire extinguishing agent storage bin moves from the inside of the fire extinguishing agent storage bin to the circuit board of the electrical box when the valve is opened.

[0007] Optionally, the fire extinguishing agent includes any one of the following:

[0008] mixture of carbonate, ammonium phosphate and sodium bicarbonate;

[0009] Carbon dioxide gas.

[0010] Optionally, the storage bin control circuit includes:

[0011] The first temperature difference power generation sheet, the output end of which is connected to the voltage comparator;

[0012] a second thermoelectric power generation sheet, the output end of which is connected to the voltage comparator; a distance between the first thermoelectric power generation sheet and the circuit board of the electrical box is smaller than a distance between the second thermoelectric power generation sheet and the circuit board of the electrical box;

[0013] The voltage comparator has an output end connected to the first switch unit; when the voltage output by the first thermoelectric power generation sheet is greater than the voltage output by the second thermoelectric power generation sheet, the voltage comparator outputs a high level signal to the first switch unit;

[0014] The first switch unit is turned on when the voltage comparator outputs a high level; when the first switch unit is turned on, the valve is opened.

[0015] Optionally, the storage bin control circuit further includes:

[0016] The second switch unit has an input end connected to a power source and an output end connected to the valve; the second switch unit is turned on when the first switch unit is turned on, and the valve is opened when the second switch unit is turned on.

[0017] Optionally, the first switch unit is an NPN transistor, and the second switch unit is a PNP transistor;

[0018] Among them, the output end of the voltage comparator is connected to the base of the first switch unit, the collector of the first switch unit is connected to the base of the second switch unit, and the emitter of the first switch unit is grounded; the emitter of the second switch unit is connected to a power supply, and the collector of the second switch unit is connected to the valve.

[0019] Optionally, the storage bin control circuit further includes:

[0020] a sixth resistor, a first end of which is connected to the collector of the first switch unit, and a second end of which is connected to the base of the second switch unit;

[0021] A seventh resistor has a first end connected to the second end of the sixth resistor, and a second end connected to the emitter of the second switch unit.

[0022] Optionally, the storage bin control circuit further includes:

[0023] A fifth resistor has a first end connected to the output end of the voltage comparator, and a second end connected to the base of the first switch unit.

[0024] Optionally, the storage bin control circuit further includes:

[0025] a first resistor, a first end of which is connected to the output end of the first thermoelectric power generation sheet, and a second end of which is connected to the input end of the voltage comparator;

[0026] a second resistor, a first end of which is connected to the second end of the first resistor and a second end of which is grounded;

[0027] a third resistor, a first end of which is connected to the output end of the second thermoelectric power generation sheet, and a second end of which is connected to the input end of the voltage comparator;

[0028] A fourth resistor has a first end connected to the second end of the third resistor and a second end grounded.

[0029] Optionally, the storage bin control circuit further includes:

[0030] The first capacitor has a first end connected to the output end of the second temperature difference power generation sheet and a power supply respectively, and a second end connected to the ground.

[0031] Optionally, the storage bin control circuit further includes:

[0032] The first diode has an anode connected to the output end of the second temperature difference power generation sheet, and a cathode connected to the first end of the first capacitor and the first end of the third resistor respectively.

[0033] An embodiment of the present invention further provides an electrical box, which includes the fire extinguishing device as described above, and a circuit board disposed under the fire extinguishing device.

[0034] An embodiment of the present invention further provides an electronic device, which includes the electrical box as described above, and other components.

[0035] The embodiments of the present invention have the following advantages:

[0036] In the embodiment of the present invention, the fire extinguishing device is arranged above the circuit board of the electrical box, and the fire extinguishing device comprises: a fire extinguishing agent storage bin provided with a valve; the fire extinguishing agent is stored inside the fire extinguishing agent storage bin, and the valve faces the circuit board of the electrical box; a storage bin control circuit connected to the valve; the storage bin control circuit is used to open the valve when it is detected that the temperature of the circuit board of the electrical box exceeds a preset value; the fire extinguishing agent stored inside the fire extinguishing agent storage bin moves from the inside of the fire extinguishing agent storage bin to the circuit board of the electrical box when the valve is opened. Through the embodiment of the present invention, the fire can be extinguished at the early stage of the fire of the circuit board of the electrical box, thereby preventing the circuit board from causing a larger fire. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solution of the present invention, the accompanying drawings required for use in the description of the present invention will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0038] Figure 1 It is a simplified structural diagram of a fire extinguishing device according to an embodiment of the present invention;

[0039] Figure 2 is a structural schematic diagram of a storage bin control circuit according to an embodiment of the present invention;

[0040] Figure 3 is a structural schematic diagram of a storage bin control circuit according to an embodiment of the present invention;

[0041] Figure 4is a structural schematic diagram of a storage bin control circuit according to an embodiment of the present invention;

[0042] Figure 5 is a structural schematic diagram of a storage bin control circuit according to an embodiment of the present invention;

[0043] Figure 6 is a structural schematic diagram of a storage bin control circuit according to an embodiment of the present invention;

[0044] Figure 7 is a structural schematic diagram of a storage bin control circuit according to an embodiment of the present invention;

[0045] Figure 8 is a structural schematic diagram of a storage bin control circuit according to an embodiment of the present invention;

[0046] Fig. 9 is a structural schematic diagram of a storage bin control circuit according to an embodiment of the present invention;

[0047] Fig.10 is a circuit diagram of a storage bin control circuit according to an embodiment of the present invention;

[0048] Fig.11 It is a structural schematic diagram of an electrical box according to an embodiment of the present invention;

[0049] Fig.12 It is a structural schematic diagram of an electronic device according to an embodiment of the present invention.

[0050] Description of reference numerals:

[0051] Fire extinguishing device 100, fire extinguishing agent storage bin 101, valve 102, storage bin control circuit 103, first temperature difference power generation sheet 104, second temperature difference power generation sheet 105, voltage comparator 106, first switch unit 107, second switch unit 108, first resistor R1, second resistor R2, third resistor R3, fourth resistor R4, fifth resistor R5, sixth resistor R6, seventh resistor R7, first diode D1, first capacitor C1, power supply VCC;

[0052] Electrical box-200, circuit board-201;

[0053] Electronic equipment - 10. DETAILED DESCRIPTION

[0054] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0055] In order to promptly extinguish a fire on a circuit board in an electrical box, an embodiment of the present invention provides a fire extinguishing device, which can be arranged above the circuit board of the electrical box; in actual application, the fire extinguishing device can detect whether the temperature of the circuit board of the electrical box exceeds a preset value; the preset value can be used to determine whether the circuit board of the electrical box is on fire.

[0056] When it is detected that the temperature of the circuit board of the electrical box exceeds the preset value, it can be determined that the circuit board has caught fire; at this time, the fire extinguishing device can open the valve and release the fire extinguishing agent stored therein to extinguish the fire in the early stage of the circuit board of the electrical box, thereby avoiding causing a larger fire. Figure 1 , showing a simplified structural diagram of a fire extinguishing device according to an embodiment of the present invention.

[0057] like Figure 1 As shown, the fire extinguishing device 100 may include a fire extinguishing agent storage compartment 101, which is provided with a valve 102; the fire extinguishing agent storage compartment 101 stores fire extinguishing agent inside, and the valve 102 faces the circuit board 201 of the electrical box 200;

[0058] The storage bin control circuit 103 is connected to the valve 102; the storage bin control circuit 103 is used to open the valve 102 when it detects that the temperature of the circuit board 201 of the electrical box 200 exceeds a preset value; the fire extinguishing agent stored inside the fire extinguishing agent storage bin 101 moves from the inside of the fire extinguishing agent storage bin 101 to the circuit board 201 of the electrical box 200 when the valve 102 is opened.

[0059] In the embodiment of the present invention, the electrical box 200 is a structure for installing, protecting and supporting electrical equipment and lines. The electrical box 200 is usually made of metal or plastic and is used in electrical systems in residential, commercial and industrial buildings. The main functions of the electrical box 200 include:

[0060] Provide physical protection for electrical wires and electrical equipment, protecting them from mechanical damage, moisture, dust and other environmental factors.

[0061] Ensure the safe operation of electrical systems and prevent electric shock accidents and fires.

[0062] Helps organize and tidy up wires, making them easier to manage and maintain.

[0063] Provide installation support for switches, receptacles, circuit breakers, and other electrical components.

[0064] There are many types of electrical boxes 200, suitable for different application scenarios, including:

[0065] Junction Box: Used to connect and distribute electrical wires, usually mounted inside a wall or ceiling.

[0066] Switch box: specially used to install light switches and sockets.

[0067] Equipment box: used to install various electrical equipment, such as circuit breakers, relays, etc.

[0068] Surface mount boxes: Designed to be mounted on the surface of a building rather than recessed into a wall or ceiling.

[0069] Flush Box: Designed to be recessed into a wall or ceiling to maintain a clean look for the building.

[0070] In order to extinguish a fire on a circuit board 201 in an electrical box 200, an embodiment of the present invention provides a fire extinguishing device 100, which can be arranged above the circuit board 201 of the electrical box 200; the fire extinguishing device 100 can have a fire extinguishing agent storage bin 101 for storing fire extinguishing agent, and a storage bin control circuit 103 for controlling the fire extinguishing agent storage bin 101.

[0071] Specifically, the fire extinguishing agent storage bin 101 may be a closed space, and the fire extinguishing agent may be stored inside the fire extinguishing agent storage bin 101; illustratively, the fire extinguishing agent may be a mixture of carbonate, ammonium phosphate and sodium bicarbonate, or may be carbon dioxide gas; specifically, the fire extinguishing agent may be a fire extinguishing substance that is non-corrosive and non-toxic to the circuit board 201, and the embodiment of the present invention does not impose any specific limitation on this.

[0072] The fire extinguishing agent storage bin 101 is provided with a valve 102, and the valve 102 can be directed toward the circuit board 201 of the electrical box 200; therefore, when the valve 102 is opened, the fire extinguishing agent in the fire extinguishing agent storage bin 101 can fall onto the burning circuit board 201 through the valve 102, thereby extinguishing the burning circuit board 201.

[0073] Exemplarily, the valve 102 may be a solenoid valve, or may be other valves 102 that can be controlled to switch on or off; this is not limited in the embodiment of the present invention.

[0074] In some feasible embodiments, the storage bin control circuit 103 can be connected to the valve 102; the storage bin control circuit 103 can determine whether the circuit board 201 of the electrical box 200 is on fire based on the temperature of the circuit board 201 of the electrical box 200; and control the valve 102 based on whether the circuit board 201 of the electrical box 200 is on fire; illustratively, when the circuit board 201 of the electrical box 200 is not on fire, the storage bin control circuit 103 can control the valve 102 to close to prevent the fire extinguishing agent from leaking out of the fire extinguishing agent storage bin 101; when the circuit board 201 of the electrical box 200 is on fire, the storage bin control circuit 103 can control the valve 102 to open to release the fire extinguishing agent to the circuit board 201 that is on fire, thereby achieving a fire extinguishing effect.

[0075] Specifically, when the temperature of the circuit board 201 of the electrical box 200 exceeds a preset value, the storage bin control circuit 103 can determine that the circuit board 201 of the electrical box 200 has caught fire; at this time, the storage bin control circuit 103 can open the valve 102 of the fire extinguishing agent storage bin 101 to release the fire extinguishing agent stored in the fire extinguishing agent storage bin 101 to the circuit board 201 that has caught fire; conversely, when the temperature of the circuit board 201 of the electrical box 200 does not exceed the preset value, the storage bin control circuit 103 can determine that the circuit board 201 of the electrical box 200 has not caught fire; at this time, the storage bin control circuit 103 can continue to keep the valve 102 of the fire extinguishing agent storage bin 101 closed.

[0076] For example, when the valve 102 is a solenoid valve: when the temperature of the circuit board 201 of the electrical box 200 exceeds a preset value, the storage bin control circuit 103 can determine that the circuit board 201 of the electrical box 200 has caught fire; at this time, the storage bin control circuit 103 can energize the electromagnetic coil; at this time, the electromagnetic coil generates a magnetic field. This magnetic field attracts the iron core (also called valve stem or piston) in the valve 102.

[0077] The movement of the iron core will change the switch state of the valve 102; specifically, when the iron core moves, the valve 102 will be opened, thereby releasing the fire extinguishing agent in the fire extinguishing agent storage bin 101 onto the circuit board 201 that has caught fire.

[0078] When the temperature of the circuit board 201 of the electrical box 200 does not exceed the preset value, the storage bin control circuit 103 can determine that the circuit board 201 of the electrical box 200 has not caught fire; at this time, the storage bin control circuit 103 may not energize the electromagnetic coil of the solenoid valve to keep the valve 102 closed.

[0079] In the embodiment of the present invention, the fire extinguishing device 100 is arranged above the circuit board 201 of the electrical box 200, and the fire extinguishing device 100 includes: a fire extinguishing agent storage bin 101, which is provided with a valve 102; the fire extinguishing agent storage bin 101 stores fire extinguishing agent, and the valve 102 faces the circuit board 201 of the electrical box 200; a storage bin control circuit 103 connected to the valve 102; the storage bin control circuit 103 is used to open the valve 102 when it is detected that the temperature of the circuit board 201 of the electrical box 200 exceeds a preset value; the fire extinguishing agent stored in the fire extinguishing agent storage bin 101 moves from the inside of the fire extinguishing agent storage bin 101 to the circuit board 201 of the electrical box 200 when the valve 102 is opened. Through the embodiment of the present invention, the fire can be extinguished at the early stage of the fire of the circuit board 201 of the electrical box 200, thereby preventing the circuit board 201 from causing a larger fire.

[0080] In one embodiment of the present invention, Figure 2 As shown, the storage bin control circuit 103 includes:

[0081] The first thermoelectric power generation sheet 104, the output end of which is connected to the voltage comparator 106;

[0082] The second thermoelectric power generation sheet 105, the output end is connected to the voltage comparator 106; the distance between the first thermoelectric power generation sheet 104 and the circuit board 201 of the electrical box 200 is smaller than the distance between the second thermoelectric power generation sheet 105 and the circuit board 201 of the electrical box 200;

[0083] The voltage comparator 106 has an output end connected to the first switch unit 107; when the voltage output by the first thermoelectric power generation sheet 104 is greater than the voltage output by the second thermoelectric power generation sheet 105, the voltage comparator 106 outputs a high level signal to the first switch unit 107;

[0084] The first switch unit 107 is turned on when the voltage comparator 106 outputs a high level; when the first switch unit 107 is turned on, the valve 102 is opened.

[0085] In some feasible embodiments, the storage bin control circuit 103 can be controlled by a thermoelectric generator to control the opening and closing of the valve 102; a thermoelectric generator can be a device that can directly convert temperature difference into electrical energy. The thermoelectric generator can work based on the thermoelectric effect (Seebeck effect), that is, when two different types of semiconductor materials (usually p-type and n-type semiconductors) are connected together and there is a temperature difference between the connection points, a voltage is generated. The basic structure of a thermoelectric generator includes a series of p-type and n-type semiconductor elements, which are connected in series or in parallel through conductive materials (such as copper) to form a thermocouple pair. When one side (hot side) of the thermocouple pair contacts a high temperature source and the other side (cold side) contacts a low temperature source, an electromotive force is generated between the semiconductor elements due to the Seebeck effect, thereby generating a current.

[0086] In an embodiment of the present invention, the storage bin control circuit 103 may include a first temperature difference power generation sheet 104 , a second temperature difference power generation sheet 105 , a voltage comparator 106 and a first switch unit 107 .

[0087] The first thermoelectric power generation sheet 104 and the second thermoelectric power generation sheet 105 can be connected to the voltage comparator 106 respectively; illustratively, the distance between the first thermoelectric power generation sheet 104 and the circuit board 201 of the electrical box 200 is smaller than the distance between the second thermoelectric power generation sheet 105 and the circuit board 201 of the electrical box 200; and one side of the first thermoelectric power generation sheet 104 is closer to the circuit board 201 of the electrical box 200 than the other side of the first thermoelectric power generation sheet 104, and one side of the second thermoelectric power generation sheet 105 is also closer to the circuit board 201 of the electrical box 200 than the other side of the second thermoelectric power generation sheet 105, so that the two sides of the first thermoelectric power generation sheet 104 and the second thermoelectric power generation sheet 105 can generate a temperature difference due to the circuit board 201 on fire, thereby generating an electromotive force, thereby generating a current. The generated current can control the valve 102 of the fire extinguishing agent storage bin 101 to open, thereby releasing the fire extinguishing agent stored in the fire extinguishing agent storage bin 101 to the circuit board 201 on fire.

[0088] Since the positions of the first thermoelectric power generation sheet 104 and the second thermoelectric power generation sheet 105 are different, the voltage output by the first thermoelectric power generation sheet 104 is different from the voltage output by the second thermoelectric power generation sheet 105. Specifically, since the first thermoelectric power generation sheet 104 is closer to the circuit board 201 of the electrical box 200, when the circuit board 201 of the electrical box 200 catches fire, the voltage output by the first thermoelectric power generation sheet 104 will be higher than the voltage output by the second thermoelectric power generation sheet 105.

[0089] Exemplarily, the output end of the first thermoelectric power generation sheet 104 (ie, the positive electrode of the first thermoelectric power generation sheet 104 ) may also be connected to the negative electrode of the second thermoelectric power generation sheet 105 .

[0090] In the embodiment of the present invention, the output end of the voltage comparator 106 may be connected to the first switch unit 107 ; the voltage comparator 106 may compare the voltage output by the first thermoelectric power generation sheet 104 with the voltage output by the second thermoelectric power generation sheet 105 .

[0091] If the voltage outputted by the first thermoelectric power generation sheet 104 received by the voltage comparator 106 is equal to the voltage outputted by the second thermoelectric power generation sheet 105, it can be indicated that the circuit board 201 of the electrical box 200 is not on fire; on the contrary, if the voltage outputted by the first thermoelectric power generation sheet 104 received by the voltage comparator 106 is greater than the voltage outputted by the second thermoelectric power generation sheet 105, it can be indicated that the circuit board 201 of the electrical box 200 is on fire. At this time, the voltage comparator 106 can output a high level signal to the first switch unit 107.

[0092] When the first switch unit 107 receives the high level signal output by the voltage comparator 106, the first switch unit 107 will be in the on state; when the first switch unit 107 is in the on state, the valve 102 will be opened; specifically, when the first switch unit 107 is in the on state, the valve 102 will be energized; at this time, the valve 102 will open to release the fire extinguishing agent stored in the fire extinguishing agent storage compartment 101 to the circuit board 201 that is on fire, thereby extinguishing the fire in the circuit board 201 that is on fire.

[0093] In one embodiment of the present invention, Figure 3 As shown, the storage bin control circuit 103 also includes:

[0094] The second switch unit 108 has an input end connected to a power source VCC and an output end connected to the valve 102 . The second switch unit 108 is turned on when the first switch unit 107 is turned on, and the valve 102 is opened when the second switch unit 108 is turned on.

[0095] In actual applications, the storage bin control circuit 103 may further include a second switch unit 108, an input end of the second switch unit 108 may be connected to a power supply VCC, and an output end of the second switch unit 108 may be connected to the valve 102; in actual applications, when the first switch unit 107 is in an on state, the second switch unit 108 will also be in an on state; when the second switch unit 108 is in an on state, the power supply VCC connected to the input end of the second switch unit 108 will supply power to the valve 102, thereby controlling the valve 102 to open, so as to release the fire extinguishing agent stored in the fire extinguishing agent storage bin 101 to the circuit board 201 that has caught fire, thereby achieving fire extinguishing.

[0096] Specifically, if the voltage output by the first thermoelectric power generation sheet 104 received by the voltage comparator 106 is equal to the voltage output by the second thermoelectric power generation sheet 105, it can be indicated that the circuit board 201 of the electrical box 200 is not on fire; on the contrary, if the voltage output by the first thermoelectric power generation sheet 104 received by the voltage comparator 106 is greater than the voltage output by the second thermoelectric power generation sheet 105, it can be indicated that the circuit board 201 of the electrical box 200 is on fire. At this time, the voltage comparator 106 can output a high level signal to the first switch unit 107.

[0097] When the first switch unit 107 receives the high level signal output by the voltage comparator 106, the first switch unit 107 will be in the on state; when the first switch unit 107 is in the on state, the second switch unit 108 will also be in the on state; when the second switch unit 108 is in the on state, the power supply VCC connected to the input end of the second switch unit 108 will supply power to the valve 102, thereby controlling the valve 102 to open, so as to release the fire extinguishing agent stored in the fire extinguishing agent storage bin 101 onto the circuit board 201 that has caught fire, thereby achieving fire extinguishing.

[0098] Exemplarily, the storage bin control circuit 103 may include a first temperature difference power generation sheet 104, a second temperature difference power generation sheet 105, a first switch unit 107, a second switch unit 108 and a voltage comparator 106; wherein the first temperature difference power generation sheet 104 and the second temperature difference power generation sheet 105 may be connected to the voltage comparator 106 respectively; the output end of the voltage comparator 106 may be connected to the first switch unit 107, the input end of the second switch unit 108 may be connected to a power supply VCC, and the output end of the second switch unit 108 may be connected to the valve 102.

[0099] In this structure, since the first thermoelectric power generation sheet 104 is closer to the circuit board 201, when the circuit board 201 of the electrical box 200 catches fire, the voltage output by the first thermoelectric power generation sheet 104 to the voltage comparator 106 is greater than the voltage output by the second thermoelectric power generation sheet 105 to the voltage comparator 106. When the voltage comparator 106 detects that the voltage output by the first thermoelectric power generation sheet 104 is greater than the voltage output by the second thermoelectric power generation sheet 105, it can output a high level signal to the first switch unit 107.

[0100] When the first switch unit 107 receives the high level signal output by the voltage comparator 106, it will be in the on state; when the first switch unit 107 is in the on state, the second switch unit 108 will also be in the on state. When the second switch unit 108 is in the on state, the power source VCC connected to the input end of the second switch unit 108 will supply power to the valve 102 through the on-state second switch unit 108; the valve 102 in the power supply state will open, and when the valve 102 is opened, the fire extinguishing agent in the fire extinguishing agent storage bin 101 will be released to the circuit board 201 on fire through the opened valve 102 to extinguish the circuit board 201 on fire.

[0101] In one embodiment of the present invention, Figure 4 As shown, the first switch unit 107 is an NPN transistor, and the second switch unit 108 is a PNP transistor;

[0102] Among them, the output end of the voltage comparator 106 is connected to the base of the first switch unit 107, the collector of the first switch unit 107 is connected to the base of the second switch unit 108, and the emitter of the first switch unit 107 is grounded; the emitter of the second switch unit 108 is connected to a power supply VCC, and the collector of the second switch unit 108 is connected to the valve 102.

[0103] Exemplarily, the first switch unit 107 may be an NPN transistor, and the second switch unit 108 may be a PNP transistor; wherein the NPN transistor is a common bipolar transistor, which is composed of three semiconductor materials doped with different types: two N-type semiconductors sandwiching a P-type semiconductor. The PNP transistor is opposite to the NPN transistor, which is composed of two P-type semiconductors sandwiching an N-type semiconductor.

[0104] In some feasible embodiments, the output end of the voltage comparator 106 can be connected to the base of the first switch unit 107, the collector of the first switch unit 107 can be connected to the base of the second switch unit 108, the emitter of the first switch unit 107 is grounded, the emitter of the second switch unit 108 can be connected to a power supply VCC, and the collector of the second switch unit 108 is connected to the valve 102.

[0105] By utilizing the characteristics of the NPN transistor and the PNP transistor, the conduction of the first switch unit 107 and the second switch unit 108 can be controlled, thereby controlling the switch of the valve 102 .

[0106] In practical applications, if the voltage output by the first thermoelectric power generation sheet 104 received by the voltage comparator 106 is equal to the voltage output by the second thermoelectric power generation sheet 105, it can be indicated that the circuit board 201 of the electrical box 200 is not on fire; on the contrary, if the voltage output by the first thermoelectric power generation sheet 104 received by the voltage comparator 106 is greater than the voltage output by the second thermoelectric power generation sheet 105, it can be indicated that the circuit board 201 of the electrical box 200 is on fire. At this time, the voltage comparator 106 can output a high level signal to the base of the first switch unit 107.

[0107] When the voltage comparator 106 outputs a high level signal, the voltage of the base of the first switch unit 107 will be greater than the voltage of the emitter of the first switch unit 107; at this time, the first switch unit 107 will be in a conducting state. When the first switch unit 107 is in a conducting state, the base of the second switch unit 108 will be grounded through the conducting first switch unit 107.

[0108] At this point, the current at the base of the second switch unit 108 will be greater than the quotient of the collector current of the second switch unit 108 and the minimum amplification factor. For example, through circuit design, the current at the base of the second switch unit 108 can be greater than the quotient of 3 times the collector current of the second switch unit 108 and the minimum amplification factor. The minimum amplification factor can be set according to actual conditions, and the embodiment of the present invention does not limit this.

[0109] When the current of the second switch unit 108 is greater than the quotient of (3 times) the collector current of the second switch unit 108 and the minimum amplification factor, the second switch unit 108 will be in a conducting state. When the second switch unit 108 is in a conducting state, the power source VCC connected to the emitter of the second switch unit 108 will provide current to the valve 102, thereby causing the valve 102 to open, so as to release the fire extinguishing agent stored in the fire extinguishing agent storage bin 101 to the circuit board 201 on fire, thereby achieving fire extinguishing.

[0110] Exemplarily, the storage bin control circuit 103 may include a first temperature difference power generation sheet 104, a second temperature difference power generation sheet 105, a first switch unit 107, a second switch unit 108 and a voltage comparator 106; wherein the first temperature difference power generation sheet 104 and the second temperature difference power generation sheet 105 may be connected to the voltage comparator 106 respectively; the output end of the voltage comparator 106 may be connected to the base of the first switch unit 107, the collector of the first switch unit 107 may be connected to the base of the second switch unit 108, the emitter of the first switch unit 107 is grounded, the emitter of the second switch unit 108 may be connected to a power supply VCC, and the collector of the second switch unit 108 is connected to the valve 102. The first switch unit 107 is an NPN transistor, and the second switch unit 108 is a PNP transistor.

[0111] In this structure, since the first thermoelectric power generation sheet 104 is closer to the circuit board 201, when the circuit board 201 of the electrical box 200 catches fire, the voltage output by the first thermoelectric power generation sheet 104 to the voltage comparator 106 is greater than the voltage output by the second thermoelectric power generation sheet 105 to the voltage comparator 106. When the voltage comparator 106 detects that the voltage output by the first thermoelectric power generation sheet 104 is greater than the voltage output by the second thermoelectric power generation sheet 105, it can output a high level signal to the base of the first switch unit 107.

[0112] When the voltage comparator 106 outputs a high level signal, the voltage of the base of the first switch unit 107 will be greater than the voltage of the emitter of the first switch unit 107; at this time, the first switch unit 107 will be in a conducting state. When the first switch unit 107 is in a conducting state, the base of the second switch unit 108 will be grounded through the conducting first switch unit 107.

[0113] At this point, the current at the base of the second switch unit 108 will be greater than the quotient of the collector current of the second switch unit 108 and the minimum amplification factor. For example, through circuit design, the current at the base of the second switch unit 108 can be greater than the quotient of 3 times the collector current of the second switch unit 108 and the minimum amplification factor. The minimum amplification factor can be set according to actual conditions, and the embodiment of the present invention does not limit this.

[0114] When the current of the second switch unit 108 is greater than the quotient of (3 times) the collector current of the second switch unit 108 and the minimum amplification factor, the second switch unit 108 will be in the on state; when the second switch unit 108 is in the on state, the power supply VCC connected to the emitter of the second switch unit 108 will provide current to the valve 102, thereby prompting the valve 102 to open, so as to release the fire extinguishing agent stored in the fire extinguishing agent storage bin 101 to the circuit board 201 that has caught fire, thereby achieving fire extinguishing.

[0115] In one embodiment of the present invention, Figure 5 As shown, the storage bin control circuit 103 also includes:

[0116] a sixth resistor R6, a first end of which is connected to the collector of the first switch unit 107, and a second end of which is connected to the base of the second switch unit 108;

[0117] The seventh resistor R7 has a first end connected to the second end of the sixth resistor R6 , and a second end connected to the emitter of the second switch unit 108 .

[0118] In some feasible embodiments, the storage bin control circuit 103 may further include a sixth resistor R6 and a seventh resistor R7. Specifically, the first end of the sixth resistor R6 may be connected to the collector of the first switch unit 107, and the second end of the sixth resistor R6 may be connected to the base of the second switch unit 108. Exemplarily, the sixth resistor R6 may be used as a current limiting resistor. The sixth resistor R6 limits the current flowing from the collector of the first switch unit 107 to the base of the second switch unit 108. This is to avoid excessive current damaging the base of the second switch unit 108 or causing the collector current of the first switch unit 107 to be too large.

[0119] When the first switch unit 107 is turned on, its collector current flows through the sixth resistor R6, which generates a voltage drop on the resistor. This voltage drop reduces the voltage of the base of the second switch unit 108 relative to its emitter, thereby satisfying the condition for the second switch unit 108 to be turned on. The sixth resistor R6 also protects the base of the second switch unit 108 from damage caused by excessive current. At the same time, it also protects the collector of the first switch unit 107 from power loss and heating problems caused by excessive current.

[0120] The first end of the seventh resistor R7 may be connected to the second end of the sixth resistor R6, and the second end of the seventh resistor R7 may be connected to the emitter of the second switch unit 108. Exemplarily, the seventh resistor R7 may be used as a pull-up resistor to ensure that the base of the second switch unit 108 maintains a higher voltage (close to the voltage of the power supply VCC) when no current passes through the sixth resistor R6, thereby ensuring that the second switch unit 108 is in a cut-off state when the first switch unit 107 is not turned on.

[0121] Exemplarily, the storage bin control circuit 103 may include a first temperature difference power generation sheet 104, a second temperature difference power generation sheet 105, a first switch unit 107, a second switch unit 108, a voltage comparator 106, a sixth resistor R6, and a seventh resistor R7; wherein the first temperature difference power generation sheet 104 and the second temperature difference power generation sheet 105 may be connected to the voltage comparator 106 respectively; the output end of the voltage comparator 106 may be connected to the first switch unit 107, the input end of the second switch unit 108 may be connected to a power supply VCC, and the output end of the second switch unit 108 may be connected to the valve 102. The first switch unit 107 is an NPN transistor, and the second switch unit 108 is a PNP transistor.

[0122] In this structure, since the first thermoelectric power generation sheet 104 is closer to the circuit board 201, when the circuit board 201 of the electrical box 200 catches fire, the voltage output by the first thermoelectric power generation sheet 104 to the voltage comparator 106 is greater than the voltage output by the second thermoelectric power generation sheet 105 to the voltage comparator 106. When the voltage comparator 106 detects that the voltage output by the first thermoelectric power generation sheet 104 is greater than the voltage output by the second thermoelectric power generation sheet 105, it can output a high level signal to the first switch unit 107.

[0123] When the voltage comparator 106 outputs a high level signal, the voltage of the base of the first switch unit 107 will be greater than the voltage of the emitter of the first switch unit 107; at this time, the first switch unit 107 will be in a conducting state. When the first switch unit 107 is in a conducting state, the base of the second switch unit 108 will be grounded through the sixth resistor R6 and the conducting first switch unit 107.

[0124] At this point, the current at the base of the second switch unit 108 will be greater than the quotient of the collector current of the second switch unit 108 and the minimum amplification factor. For example, through circuit design, the current at the base of the second switch unit 108 can be greater than the quotient of 3 times the collector current of the second switch unit 108 and the minimum amplification factor. The minimum amplification factor can be set according to actual conditions, and the embodiment of the present invention does not limit this.

[0125] When the current of the second switch unit 108 is greater than the quotient of (3 times) the collector current of the second switch unit 108 and the minimum amplification factor, the second switch unit 108 will be in the on state; when the second switch unit 108 is in the on state, the power supply VCC connected to the emitter of the second switch unit 108 will provide current to the valve 102, thereby prompting the valve 102 to open, so as to release the fire extinguishing agent stored in the fire extinguishing agent storage bin 101 to the circuit board 201 that has caught fire, thereby achieving fire extinguishing.

[0126] In one embodiment of the present invention, Figure 6 As shown, the storage bin control circuit 103 may further include:

[0127] The fifth resistor R5 has a first end connected to the output end of the voltage comparator 106 , and a second end connected to the base of the first switch unit 107 .

[0128] In some feasible embodiments, the storage bin control circuit 103 may further include a fifth resistor R5; the first end of the fifth resistor R5 may be connected to the output end of the voltage comparator 106, and the second end of the fifth resistor R5 may be connected to the base of the first switch unit 107; exemplarily, the fifth resistor R5 may be a current limiting resistor.

[0129] Exemplarily, the storage bin control circuit 103 may include a first temperature difference power generation sheet 104, a second temperature difference power generation sheet 105, a first switch unit 107, a second switch unit 108, a voltage comparator 106, a fifth resistor R5, a sixth resistor R6, and a seventh resistor R7; wherein the first temperature difference power generation sheet 104 and the second temperature difference power generation sheet 105 may be connected to the voltage comparator 106 respectively; the output end of the voltage comparator 106 may be connected to the first switch unit 107 through the fifth resistor R5, the input end of the second switch unit 108 may be connected to a power supply VCC, and the output end of the second switch unit 108 may be connected to the valve 102. The first switch unit 107 is an NPN transistor, and the second switch unit 108 is a PNP transistor.

[0130] In this structure, since the first thermoelectric power generation sheet 104 is closer to the circuit board 201, when the circuit board 201 of the electrical box 200 catches fire, the voltage output by the first thermoelectric power generation sheet 104 to the voltage comparator 106 is greater than the voltage output by the second thermoelectric power generation sheet 105 to the voltage comparator 106. When the voltage comparator 106 detects that the voltage output by the first thermoelectric power generation sheet 104 is greater than the voltage output by the second thermoelectric power generation sheet 105, it can output a high level signal to the base of the first switch unit 107 through the fifth resistor R5.

[0131] When the voltage comparator 106 outputs a high-level signal, the current at the base of the first switch unit 107 will be greater than the quotient of the collector current of the first switch unit 107 and the minimum amplification factor; illustratively, through circuit design, when the voltage comparator 106 outputs a high-level signal, the current at the base of the first switch unit 107 will be greater than 3 times the quotient of the collector current of the first switch unit 107 and the minimum amplification factor.

[0132] When the current of the first switch unit 107 is greater than the quotient of the collector current of the first switch unit 107 and the minimum gain factor, the first switch unit 107 will be in a conducting state. When the first switch unit 107 is in a conducting state, the base of the second switch unit 108 will be grounded through the sixth resistor R6 and the conducting first switch unit 107.

[0133] At this point, the voltage at the base of the second switch unit 108 will be lower than the voltage at the emitter of the second switch unit 108; when the voltage at the base of the second switch unit 108 is lower than the voltage at the emitter of the second switch unit 108, the second switch unit 108 will be in an on state; when the second switch unit 108 is in an on state, the power supply VCC connected to the emitter of the second switch unit 108 will provide current to the valve 102, thereby causing the valve 102 to open, so as to release the fire extinguishing agent stored in the fire extinguishing agent storage bin 101 onto the circuit board 201 that has caught fire, thereby achieving fire extinguishing.

[0134] In one embodiment of the present invention, Figure 7 As shown, the storage bin control circuit 103 also includes:

[0135] A first resistor R1, a first end of which is connected to the output end of the first thermoelectric power generation sheet 104, and a second end of which is connected to the input end of the voltage comparator 106;

[0136] A second resistor R2, a first end of which is connected to the second end of the first resistor R1, and a second end of which is grounded;

[0137] A third resistor R3, a first end of which is connected to the output end of the second thermoelectric power generation sheet 105, and a second end of which is connected to the input end of the voltage comparator 106;

[0138] The fourth resistor R4 has a first end connected to the second end of the third resistor R3 and a second end grounded.

[0139] In some feasible embodiments, the storage bin control circuit 103 may further include a first resistor R1, a second resistor R2, a third resistor R3 and a fourth resistor R4. The first resistor R1, the second resistor R2, the third resistor R3 and the fourth resistor R4 may be voltage-dividing resistors, and the resistance values ​​of the first resistor R1, the second resistor R2, the third resistor R3 and the fourth resistor R4 may be set according to actual conditions; specifically, the resistance values ​​of the first resistor R1, the second resistor R2, the third resistor R3 and the fourth resistor R4 need to ensure that when the circuit board 201 of the electrical box 200 is not on fire, the voltage output by the first thermoelectric power generation sheet 104 to the voltage comparator 106 is not higher than the voltage output by the second thermoelectric power generation sheet 105 to the voltage comparator 106; and ensure that when the circuit board 201 of the electrical box 200 is on fire, the voltage output by the first thermoelectric power generation sheet 104 to the voltage comparator 106 is greater than the voltage output by the second thermoelectric power generation sheet 105 to the voltage comparator 106.

[0140] In practical applications, the first end of the first resistor R1 can be connected to the output end of the first thermoelectric power generation sheet 104, and the second end of the first resistor R1 can be connected to the input end of the voltage comparator 106; the first end of the second resistor R2 can be connected to the second end of the first resistor R1, and the second end of the second resistor R2 can be grounded; the first end of the third resistor R3 can be connected to the output end of the second thermoelectric power generation sheet 105, and the second end of the third resistor R3 can be connected to the input end of the voltage comparator 106; the first end of the fourth resistor R4 can be connected to the second end of the third resistor R3, and the second end of the fourth resistor R4 can be grounded.

[0141] Exemplarily, the storage bin control circuit 103 may include a first temperature difference power generation sheet 104, a second temperature difference power generation sheet 105, a first switch unit 107, a second switch unit 108, a voltage comparator 106, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6 and a seventh resistor R7; wherein the output end (i.e., the positive electrode) of the first temperature difference power generation sheet 104 may be connected to the first end of the first resistor R1, the second end of the first resistor R1 may be connected to the input end of the voltage comparator 106; the first end of the second resistor R2 may be connected to the positive electrode of the first resistor R1. The second end of the second resistor R2 can be connected, and the second end of the second resistor R2 can be grounded; the output end (i.e., the positive electrode) of the second temperature difference power generation sheet 105 can be connected to the first end of the third resistor R3, and the second end of the third resistor R3 can be connected to the input end of the voltage comparator 106; the first end of the fourth resistor R4 can be connected to the second end of the third resistor R3, and the second end of the fourth resistor R4 can be grounded; the output end of the voltage comparator 106 can be connected to the first switch unit 107 through the fifth resistor R5, the input end of the second switch unit 108 can be connected to a power supply VCC, and the output end of the second switch unit 108 can be connected to the valve 102. The first switch unit 107 is an NPN transistor, and the second switch unit 108 is a PNP transistor.

[0142] In this structure, since the first thermoelectric power generation sheet 104 is closer to the circuit board 201, when the circuit board 201 of the electrical box 200 catches fire, the voltage outputted to the voltage comparator 106 by the first thermoelectric power generation sheet 104 via the first resistor R1 and the second resistor R2 is greater than the voltage outputted to the voltage comparator 106 by the second thermoelectric power generation sheet 105 via the third resistor R3 and the fourth resistor R4. When the voltage comparator 106 detects that the voltage outputted by the first thermoelectric power generation sheet 104 is greater than the voltage outputted by the second thermoelectric power generation sheet 105, it can output a high level signal to the base of the first switch unit 107 via the fifth resistor R5.

[0143] When the voltage comparator 106 outputs a high level signal, the voltage of the base of the first switch unit 107 will be greater than the voltage of the emitter of the first switch unit 107; at this time, the first switch unit 107 will be in a conducting state. When the first switch unit 107 is in a conducting state, the base of the second switch unit 108 will be grounded through the sixth resistor R6 and the conducting first switch unit 107.

[0144] At this point, the current at the base of the second switch unit 108 will be greater than the quotient of the collector current of the second switch unit 108 and the minimum amplification factor. For example, through circuit design, the current at the base of the second switch unit 108 can be greater than the quotient of 3 times the collector current of the second switch unit 108 and the minimum amplification factor. The minimum amplification factor can be set according to actual conditions, and the embodiment of the present invention does not limit this.

[0145] When the current of the second switch unit 108 is greater than the quotient of (3 times) the collector current of the second switch unit 108 and the minimum amplification factor, the second switch unit 108 will be in the on state; when the second switch unit 108 is in the on state, the power supply VCC connected to the emitter of the second switch unit 108 will provide current to the valve 102, thereby prompting the valve 102 to open, so as to release the fire extinguishing agent stored in the fire extinguishing agent storage bin 101 to the circuit board 201 that has caught fire, thereby achieving fire extinguishing.

[0146] In one embodiment of the present invention, Figure 8 As shown, the storage bin control circuit 103 also includes:

[0147] The first capacitor C1 has a first end connected to the output end of the second temperature difference power generation sheet 105 and a power source VCC respectively, and a second end grounded.

[0148] In some feasible embodiments, the storage bin deletion control circuit 103 may further include a first capacitor C1, which may be used for energy storage, filtering, etc.; specifically, the first end of the first capacitor C1 may be respectively connected to the output end of the second temperature difference power generation sheet 105 and a power supply VCC, and the second end of the first capacitor C1 may be grounded.

[0149] As an example, the second end of the first capacitor C1 and the second end of the fourth resistor R4 may be grounded together.

[0150] Exemplarily, the storage bin control circuit 103 may include a first temperature difference power generation sheet 104, a second temperature difference power generation sheet 105, a first switch unit 107, a second switch unit 108, a voltage comparator 106, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7 and a first capacitor C1; wherein the output end (i.e., the positive electrode) of the first temperature difference power generation sheet 104 may be connected to the first end of the first resistor R1, and the second end of the first resistor R1 may be connected to the input end of the voltage comparator 106; the first end of the second resistor R2 may be connected to the second end of the first resistor R1, and the second end of the second resistor R2 may be grounded; the output end (i.e., the positive electrode) of the second temperature difference power generation sheet 105 may be connected to the first end of the first resistor R1, and the second end of the second resistor R2 may be grounded; The first end of the fourth resistor R4 can be connected to the second end of the third resistor R3, and the second end of the fourth resistor R4 can be connected to the input end of the voltage comparator 106; the first end of the fourth resistor R4 can be connected to the second end of the third resistor R3, and the second end of the fourth resistor R4 can be grounded; the output end of the voltage comparator 106 can be connected to the first switch unit 107 through the fifth resistor R5, the input end of the second switch unit 108 can be connected to a power supply VCC, and the output end of the second switch unit 108 can be connected to the valve 102; the first end of the first capacitor C1 can be connected to the output end of the second temperature difference power generation sheet 105 and a power supply VCC respectively, and the second end of the first capacitor C1 can be grounded; the second end of the first capacitor C1 and the second end of the fourth resistor R4 can be grounded together. The first switch unit 107 is an NPN transistor, and the second switch unit 108 is a PNP transistor.

[0151] In this structure, since the first thermoelectric power generation sheet 104 is closer to the circuit board 201, when the circuit board 201 of the electrical box 200 catches fire, the voltage outputted to the voltage comparator 106 by the first thermoelectric power generation sheet 104 via the first resistor R1 and the second resistor R2 is greater than the voltage outputted to the voltage comparator 106 by the second thermoelectric power generation sheet 105 via the third resistor R3 and the fourth resistor R4. When the voltage comparator 106 detects that the voltage outputted by the first thermoelectric power generation sheet 104 is greater than the voltage outputted by the second thermoelectric power generation sheet 105, it can output a high level signal to the base of the first switch unit 107 via the fifth resistor R5.

[0152] When the voltage comparator 106 outputs a high level signal, the voltage of the base of the first switch unit 107 will be greater than the voltage of the emitter of the first switch unit 107; at this time, the first switch unit 107 will be in a conducting state. When the first switch unit 107 is in a conducting state, the base of the second switch unit 108 will be grounded through the sixth resistor R6 and the conducting first switch unit 107.

[0153] At this point, the current at the base of the second switch unit 108 will be greater than the quotient of the collector current of the second switch unit 108 and the minimum amplification factor. For example, through circuit design, the current at the base of the second switch unit 108 can be greater than the quotient of 3 times the collector current of the second switch unit 108 and the minimum amplification factor. The minimum amplification factor can be set according to actual conditions, and the embodiment of the present invention does not limit this.

[0154] When the current of the second switch unit 108 is greater than the quotient of (3 times) the collector current of the second switch unit 108 and the minimum amplification factor, the second switch unit 108 will be in the on state; when the second switch unit 108 is in the on state, the power supply VCC connected to the emitter of the second switch unit 108 will provide current to the valve 102, thereby prompting the valve 102 to open, so as to release the fire extinguishing agent stored in the fire extinguishing agent storage bin 101 to the circuit board 201 that has caught fire, thereby achieving fire extinguishing.

[0155] In one embodiment of the present invention, Fig. 9 As shown, the storage bin control circuit 103 also includes:

[0156] The first diode D1 has an anode connected to the output end of the second thermoelectric power generation sheet 105 , and a cathode connected to the first end of the first capacitor C1 and the first end of the third resistor R3 .

[0157] In some feasible embodiments, the storage bin control circuit 103 may further include a first diode D1, the anode of the first diode D1 being connected to the output end of the second thermoelectric power generation sheet 105, and the cathode of the first diode D1 being connected to the first ends of the first capacitor C1 and the third resistor R3, respectively; the first diode D1 may be used to prevent the current of the first capacitor C1 from returning to the second thermoelectric power generation sheet 105.

[0158] Exemplarily, the storage bin control circuit 103 may include a first temperature difference power generation sheet 104, a second temperature difference power generation sheet 105, a first switch unit 107, a second switch unit 108, a voltage comparator 106, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a first capacitor C1 and a first diode D1; wherein the output end (i.e., the positive electrode) of the first temperature difference power generation sheet 104 may be connected to the first end of the first resistor R1, and the second end of the first resistor R1 may be connected to the input end of the voltage comparator 106; the first end of the second resistor R2 may be connected to the second end of the first resistor R1, and the second end of the second resistor R2 may be grounded; the output end (i.e., the positive electrode) of the second temperature difference power generation sheet 105 may be connected to the first end of the first resistor R1, and the second end of the second resistor R2 may be grounded; ) can be connected to the first end of the third resistor R3 through the first diode D1, and the second end of the third resistor R3 can be connected to the input end of the voltage comparator 106; the first end of the fourth resistor R4 can be connected to the second end of the third resistor R3, and the second end of the fourth resistor R4 can be grounded; the output end of the voltage comparator 106 can be connected to the first switch unit 107 through the fifth resistor R5, the input end of the second switch unit 108 can be connected to a power supply VCC, and the output end of the second switch unit 108 can be connected to the valve 102; the first end of the first capacitor C1 can be connected to the output end of the second temperature difference power generation sheet 105 and a power supply VCC respectively, and the second end of the first capacitor C1 can be grounded; the second end of the first capacitor C1 and the second end of the fourth resistor R4 can be grounded together. The first switch unit 107 is an NPN transistor, and the second switch unit 108 is a PNP transistor.

[0159] In this structure, since the first thermoelectric power generation sheet 104 is closer to the circuit board 201, when the circuit board 201 of the electrical box 200 catches fire, the voltage outputted to the voltage comparator 106 by the first thermoelectric power generation sheet 104 via the first resistor R1 and the second resistor R2 is greater than the voltage outputted to the voltage comparator 106 by the second thermoelectric power generation sheet 105 via the third resistor R3, the fourth resistor R4 and the first diode D1. When the voltage comparator 106 detects that the voltage outputted by the first thermoelectric power generation sheet 104 is greater than the voltage outputted by the second thermoelectric power generation sheet 105, it can output a high level signal to the base of the first switch unit 107 via the fifth resistor R5.

[0160] When the voltage comparator 106 outputs a high level signal, the voltage of the base of the first switch unit 107 will be greater than the voltage of the emitter of the first switch unit 107; at this time, the first switch unit 107 will be in a conducting state. When the first switch unit 107 is in a conducting state, the base of the second switch unit 108 will be grounded through the sixth resistor R6 and the conducting first switch unit 107.

[0161] At this point, the current at the base of the second switch unit 108 will be greater than the quotient of the collector current of the second switch unit 108 and the minimum amplification factor. For example, through circuit design, the current at the base of the second switch unit 108 can be greater than the quotient of 3 times the collector current of the second switch unit 108 and the minimum amplification factor. The minimum amplification factor can be set according to actual conditions, and the embodiment of the present invention does not limit this.

[0162] When the current of the second switch unit 108 is greater than the quotient of (3 times) the collector current of the second switch unit 108 and the minimum amplification factor, the second switch unit 108 will be in the on state; when the second switch unit 108 is in the on state, the power supply VCC connected to the emitter of the second switch unit 108 will provide current to the valve 102, thereby prompting the valve 102 to open, so as to release the fire extinguishing agent stored in the fire extinguishing agent storage bin 101 to the circuit board 201 that has caught fire, thereby achieving fire extinguishing.

[0163] For example, Fig.10 As shown, the positive electrode of the first thermoelectric power generation sheet 104 is connected to the negative electrode of the second thermoelectric power generation sheet 105 and the first end of the first resistor R1 respectively, and the negative electrode of the first thermoelectric power generation sheet 104 is grounded; the second end of the first resistor R1 can be connected to the input end of the voltage comparator 106; the first end of the second resistor R2 can be connected to the second end of the first resistor R1, and the second end of the second resistor R2 can be grounded; the output end (i.e., the positive electrode) of the second thermoelectric power generation sheet 105 can be connected to the first end of the third resistor R3 through the first diode D1, and the second end of the third resistor R3 can be connected to the voltage comparator 106. The first end of the fourth resistor R4 can be connected to the input end of the third resistor R3, and the second end of the fourth resistor R4 can be grounded; the output end of the voltage comparator 106 can be connected to the base of the first switch unit 107 through the fifth resistor R5, the emitter of the first switch unit 107 can be grounded, and the collector of the first switch unit can be connected to the base of the second switch unit through the sixth resistor; the first end of the seventh resistor R7 can be connected to the second end of the sixth resistor R6, and the second end of the seventh resistor R7 can be connected to the emitter of the second switch unit 108. The emitter of the second switch unit 108 can be connected to a power supply VCC, the collector of the second switch unit 108 can be connected to the valve 102, and the other end of the valve can be grounded.

[0164] In one embodiment of the present invention, Fig.11 As shown, an electrical box 200 is also provided, characterized in that the electrical box 200 may include the fire extinguishing device 100 as described above, and a circuit board 201 arranged under the fire extinguishing device 100 .

[0165] In one embodiment of the present invention, Fig.12As shown, an electronic device 10 is also provided. The electronic device 10 may include the above electrical box 200 and other components.

[0166] Exemplarily, the electronic device 10 may be a household appliance, which is not limited in the embodiment of the present invention. Other components may form the electronic device 10 with the electrical box 200; wherein, the other components may be other components in the electronic device 10 except the electrical box 200, such as: microprocessor / microcontroller, sensor, display, input device, output device, power management component, communication interface, storage device, cooling system, housing and structural parts, connector and cable, etc., which is not limited in the embodiment of the present invention.

[0167] Finally, it should be noted that, in this article, 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 "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or terminal 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 terminal device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or terminal device including the elements.

[0168] The fire extinguishing device, the electrical box and the electronic device provided are introduced in detail above. The principle and implementation mode of the present invention are explained by using specific examples in this article. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation mode and the scope of application. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A fire extinguishing device, characterized in that: The fire extinguishing device is arranged above the circuit board of the electrical box, and the fire extinguishing device comprises: The fire extinguishing agent storage bin is provided with a valve; the fire extinguishing agent is stored inside the fire extinguishing agent storage bin, and the valve faces the circuit board of the electrical box; A storage bin control circuit is connected to the valve; the storage bin control circuit is used to open the valve when it is detected that the temperature of the circuit board of the electrical box exceeds a preset value; the fire extinguishing agent stored inside the fire extinguishing agent storage bin moves from the inside of the fire extinguishing agent storage bin to the circuit board of the electrical box when the valve is opened.

2. The fire extinguishing device according to claim 1, characterized in that: The fire extinguishing agent includes any one of the following: mixture of carbonate, ammonium phosphate and sodium bicarbonate; Carbon dioxide gas.

3. The fire extinguishing device according to claim 1, characterized in that: The storage bin control circuit comprises: The first temperature difference power generation sheet, the output end of which is connected to the voltage comparator; a second thermoelectric power generation sheet, the output end of which is connected to the voltage comparator; a distance between the first thermoelectric power generation sheet and the circuit board of the electrical box is smaller than a distance between the second thermoelectric power generation sheet and the circuit board of the electrical box; The voltage comparator has an output end connected to the first switch unit; when the voltage output by the first thermoelectric power generation sheet is greater than the voltage output by the second thermoelectric power generation sheet, the voltage comparator outputs a high level signal to the first switch unit; The first switch unit is turned on when the voltage comparator outputs a high level; when the first switch unit is turned on, the valve is opened.

4. The fire extinguishing device according to claim 3, characterized in that: The storage bin control circuit also includes: The second switch unit has an input end connected to a power source and an output end connected to the valve; the second switch unit is turned on when the first switch unit is turned on, and the valve is opened when the second switch unit is turned on.

5. The fire extinguishing device according to claim 4, characterized in that: The first switch unit is an NPN transistor, and the second switch unit is a PNP transistor; Among them, the output end of the voltage comparator is connected to the base of the first switch unit, the collector of the first switch unit is connected to the base of the second switch unit, and the emitter of the first switch unit is grounded; the emitter of the second switch unit is connected to a power supply, and the collector of the second switch unit is connected to the valve.

6. The fire extinguishing device according to claim 5, characterized in that: The storage bin control circuit also includes: a sixth resistor, a first end of which is connected to the collector of the first switch unit, and a second end of which is connected to the base of the second switch unit; A seventh resistor has a first end connected to the second end of the sixth resistor, and a second end connected to the emitter of the second switch unit.

7. The fire extinguishing device according to claim 5, characterized in that: The storage bin control circuit also includes: A fifth resistor has a first end connected to the output end of the voltage comparator, and a second end connected to the base of the first switch unit.

8. The fire extinguishing device according to claim 3, characterized in that: The storage bin control circuit also includes: a first resistor, a first end of which is connected to the output end of the first thermoelectric power generation sheet, and a second end of which is connected to the input end of the voltage comparator; a second resistor, a first end of which is connected to the second end of the first resistor and a second end of which is grounded; a third resistor, a first end of which is connected to the output end of the second thermoelectric power generation sheet, and a second end of which is connected to the input end of the voltage comparator; A fourth resistor has a first end connected to the second end of the third resistor and a second end grounded.

9. The fire extinguishing device according to claim 8, characterized in that: The storage bin control circuit also includes: The first capacitor has a first end connected to the output end of the second temperature difference power generation sheet and a power supply respectively, and a second end connected to the ground.

10. The fire extinguishing device according to claim 9, characterized in that: The storage bin control circuit also includes: The first diode has an anode connected to the output end of the second temperature difference power generation sheet, and a cathode connected to the first end of the first capacitor and the first end of the third resistor respectively.

11. An electrical box, characterized in that: The electrical box comprises a fire extinguishing device as claimed in any one of claims 1 to 10, and a circuit board arranged under the fire extinguishing device.

12. An electronic device, characterized in that: The electronic device comprises the electrical box as claimed in claim 11, and other components.

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