False triggering prevention circuit for fire extinguisher in battery charging and replacing cabinet

Abstract

The utility model discloses a fire extinguisher false triggering prevention circuit in a battery charging and swapping cabinet, which comprises a single chip microcomputer, the single chip microcomputer is electrically connected with a first pin of a fire extinguisher terminal CN through a high level output circuit, the first pin is electrically connected with a positive electricity end of a fire extinguisher trigger, and the single chip microcomputer is electrically connected with a second pin of the fire extinguisher terminal CN through a low level output circuit. The second pin is electrically connected with the trigger end of the fire extinguisher trigger; the fire extinguisher terminal CN is further provided with a fourth pin, and the fourth pin is electrically connected with the negative electricity end of the fire extinguisher trigger and is grounded. According to the utility model, a double-level circuit is adopted, that is, the fire extinguisher can be normally started only when two signals of the single chip microcomputer are different, i.e., the FIRE-AMCU is high and the RIREMCU is low. In the initialization process, the same single-chip microcomputer sends high levels or low levels at the same time, but one high level and one low level cannot be sent at all, and the circuit ensures reliable triggering of the fire extinguisher.

Description

Technical field:

[0001] The utility model belongs to the field of electricity, and in particular relates to a circuit for preventing a fire extinguisher in a charging and swapping cabinet from being triggered by mistake. Background technology:

[0002] In order to prevent the rechargeable battery from catching fire, each battery swap cabinet is equipped with an aerosol fire extinguisher. Most fire extinguishers are electrically activated. The fire extinguisher circuits commonly used in the battery swap cabinet control panel are as follows: Figure 1 As shown in the figure, when FIRE_MCU is at a high level, the fire extinguisher pin 2 is pulled low, triggering the fire extinguisher. However, when the MCU is powered on or off, due to MCU initialization or interference, the MCU output level should be low, but it is mistakenly triggered high, causing the fire extinguisher to spray inadvertently. This mistriggered fire extinguisher will cause the entire power exchange cabinet to lose power and damage the batteries in the battery compartment where it is located. This is a relatively serious accident and needs to be improved. Utility model content:

[0003] The purpose of the utility model is to provide a circuit for preventing a fire extinguisher in a charging and swapping cabinet from being triggered by mistake.

[0004] In order to solve the above problems, the technical solution of the present utility model is:

[0005] A circuit for preventing false triggering of a fire extinguisher in a charging and swapping cabinet includes a single-chip microcomputer, wherein the single-chip microcomputer is electrically connected to a first pin of a fire extinguisher terminal CN through a high-level output circuit, and the first pin is electrically connected to a positive terminal of a fire extinguisher trigger; the single-chip microcomputer is electrically connected to a second pin of the fire extinguisher terminal CN through a low-level output circuit, and the second pin is electrically connected to a triggering terminal of the fire extinguisher trigger; the fire extinguisher terminal CN is also provided with a fourth pin, which is electrically connected to a negative terminal of the fire extinguisher trigger and is grounded.

[0006] In a further improvement, the high-level output circuit includes a third resistor at one end electrically connected to the microcontroller, the other end of the third resistor electrically connected to one end of a fourth resistor and a gate of a third MOS transistor; the source of the third MOS transistor is electrically connected to the other end of the fourth resistor and is grounded, and the drain of the third MOS transistor is electrically connected to the first pin and the power supply voltage VCC through a relay.

[0007] In a further improvement, the low-level output circuit includes one end electrically connected to a sixth resistor of the single-chip microcomputer, the other end of the sixth resistor electrically connected to one end of a seventh resistor and the gate of a second MOS transistor, the source of the second MOS transistor electrically connected to the other end of the seventh resistor, one end of the eighth resistor, and the source of the fourth MOS transistor and grounded; the drain of the second MOS transistor electrically connected to one end of the fifth resistor, the other end of the eighth resistor, and the gate of the fourth MOS transistor; the other end of the fifth resistor electrically connected to a power supply; and the drain of the fourth MOS transistor electrically connected to the second pin through a ninth resistor.

[0008] As a further improvement, the voltage of the power supply is 3.3V.

[0009] As a further improvement, the fire extinguisher terminal CN is further provided with a third pin, the third pin is electrically connected to the single chip microcomputer, and the single chip microcomputer is electrically connected to the alarm.

[0010] Advantages of this utility model:

[0011] This utility model uses a dual-level circuit, meaning the fire extinguisher activates only when two signals from the microcontroller are different: FIRE-A_MCU is high and RIRE_MCU is low. During initialization, it's common for the same microcontroller to send both high and low signals simultaneously, but it's impossible for one high and one low signal to occur simultaneously. This circuit ensures reliable triggering of the fire extinguisher. Description of the drawings:

[0012] Figure 1 This is a schematic diagram of the existing fire extinguisher trigger circuit structure;

[0013] Figure 2 This is a schematic diagram of the fire extinguisher's circuit for preventing false triggering. Specific implementation method:

[0014] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be understood as limiting the present application.

[0015] Example 1

[0016] like Figure 2 A fire extinguisher anti-false triggering circuit in a charging and swapping cabinet shown in the figure includes a fire extinguisher terminal CN2, and the fire extinguisher terminal CN2 includes a first pin 1, a second pin 2, a third pin 3 and a fourth pin 4; the first pin 1 is electrically connected to the positive end of the fire extinguisher trigger, the fourth pin 4 is electrically connected to the negative end of the fire extinguisher trigger and is grounded; the second pin 2 is electrically connected to the trigger end of the fire extinguisher trigger, and the third pin 3 is electrically connected to the feedback end of the fire extinguisher trigger and directly electrically connected to the RIRE_FB end of the microcontroller to feedback the signal that the fire extinguisher has been triggered.

[0017] The FIRE-A_MCU terminal of the single chip microcomputer is electrically connected to the first pin 1 of the fire extinguisher terminal CN2 through a high level output circuit, and the RIRE_MC terminal is electrically connected to the second pin 2 of the fire extinguisher terminal CN2 through a low level output circuit.

[0018] like Figure 2 As shown, the high-level output circuit includes one end electrically connected to a third resistor R3 of the single-chip microcomputer, the other end of the third resistor R3 electrically connected to one end of a fourth resistor R4 and a gate of a third MOS transistor Q3; the source of the third MOS transistor Q3 is electrically connected to the other end of the fourth resistor R4 and is grounded, the drain of the third MOS transistor Q3 is electrically connected to the second pin of the relay RY1, the second pin of the relay RY1 is electrically connected to the third pin of the relay RY1 and the power supply voltage VCC, the third pin of the relay RY1 is electrically connected to the fourth pin of the relay RY1 through a switch, and the fourth pin of the relay RY1 is electrically connected to the first pin 1 of the fire extinguisher terminal CN2. The low-level output circuit includes one end electrically connected to a sixth resistor R6 of the single-chip microcomputer, the other end of the sixth resistor R6 electrically connected to one end of a seventh resistor R7 and the gate of the second MOS transistor Q2, the source of the second MOS transistor Q2 electrically connected to the other end of the seventh resistor R7, one end of the eighth resistor R8, and the source of the fourth MOS transistor Q4, and grounded; the drain of the second MOS transistor Q2 electrically connected to one end of the fifth resistor R5, the other end of the eighth resistor R8, and the gate of the fourth MOS transistor Q4; the other end of the fifth resistor R5 electrically connected to the power supply V3.3; and the drain of the fourth MOS transistor Q4 electrically connected to the second pin 2 via a ninth resistor R9.

[0019] The usage principle is as follows:

[0020] When FIRE-A_MCU is high, the coil of relay RY1 is powered, and pins 3 and 4 of relay RY1 are shorted, allowing the fire extinguisher to function normally. When RIRE_MCU is low, meaning Q2 is off and Q4 is on, the second pin of the fire extinguisher is pulled low, causing the fire extinguisher to fire. This means the fire extinguisher will fire only when both FIRE-A_MCU and RIRE_MCU are simultaneously high or low. While it's common for the same microcontroller to simultaneously send high or low signals during initialization, it's completely impossible for one high and one low signal to occur simultaneously. This circuit ensures reliable triggering of the fire extinguisher, effectively preventing false triggering.

[0021] The above embodiment is only a specific implementation of the present invention and is not intended to limit the present invention. Any simple improvements and replacements thereto are within the scope of protection of the present invention.

Claims

1. A circuit for preventing mis-triggering of a fire extinguisher in a charging and swapping cabinet, characterized in that: The invention comprises a single chip microcomputer, wherein the single chip microcomputer is electrically connected to a first pin (1) of a fire extinguisher terminal (CN2) through a high-level output circuit, the first pin (1) is electrically connected to a positive electric end of a fire extinguisher trigger, the single chip microcomputer is electrically connected to a second pin (2) of the fire extinguisher terminal (CN2) through a low-level output circuit, the second pin (2) is electrically connected to a trigger end of the fire extinguisher trigger; the fire extinguisher terminal (CN2) is further provided with a fourth pin (4), the fourth pin (4) is electrically connected to a negative electric end of the fire extinguisher trigger and is grounded.

2. The circuit for preventing mis-triggering of a fire extinguisher in a charging and swapping cabinet according to claim 1, characterized in that: The high-level output circuit comprises a third resistor (R3) of the single-chip computer having one end electrically connected thereto, the other end of the third resistor (R3) electrically connected to one end of a fourth resistor (R4) and a gate of a third MOS tube (Q3); a source of the third MOS tube (Q3) electrically connected to the other end of the fourth resistor (R4) and grounded, and a drain of the third MOS tube (Q3) electrically connected to a first pin (1) and a power supply voltage (VCC) via a relay (RY1).

3. The circuit for preventing mis-triggering of a fire extinguisher in a charging and swapping cabinet according to claim 1, characterized in that: The low-level output circuit comprises a sixth resistor (R6) of the single-chip computer electrically connected at one end, the other end of the sixth resistor (R6) electrically connected to one end of the seventh resistor (R7) and the grid of the second MOS transistor (Q2), the source of the second MOS transistor (Q2) electrically connected to the other end of the seventh resistor (R7), one end of the eighth resistor (R8) and the source of the fourth MOS transistor (Q4) and grounded; the drain of the second MOS transistor (Q2) electrically connected to one end of the fifth resistor (R5), the other end of the eighth resistor (R8) and the grid of the fourth MOS transistor (Q4); the other end of the fifth resistor (R5) electrically connected to the power supply (V3.3); and the drain of the fourth MOS transistor (Q4) electrically connected to the second pin (2) via a ninth resistor (R9).

4. The circuit for preventing mis-triggering of a fire extinguisher in a charging and swapping cabinet according to claim 3, characterized in that: The voltage of the power supply (V3.3) is 3.3V.

5. The circuit for preventing mis-triggering of a fire extinguisher in a charging and swapping cabinet according to claim 1, characterized in that: The fire extinguisher terminal (CN2) is further provided with a third pin (3), the third pin (3) is electrically connected to the single chip microcomputer, and the single chip microcomputer is electrically connected to the alarm.

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