Smoke automatic detection tooling circuit

Abstract

The utility model discloses a kind of automatic detection tool circuit of smoke sensing, comprising: power supply, isolation voltage stabilizing module, power control module, first switch module, voltage conversion module, second switch module, smoke sensor and control module;Power supply first output end exports 12V direct current voltage, and power supply second output end exports 5V direct current voltage;Power supply first output end is connected to isolation voltage stabilizing module input end, and action control part and switch part are set in power control module, action control part is used to control switch part action, and isolation voltage stabilizing module output end is connected to voltage conversion module input end by switch part in power control module, and power supply second output end is powered for action control part by first switch module.The automatic detection tool circuit of smoke sensing solves the problem that smoke sensing detection circuit in bottom cover circuit board separation type smoke sensing detector cannot be detected in prior art.

Description

Technical Field

[0001] This utility model relates to the field of smoke sensor detection, specifically to an automatic smoke detection tooling circuit. Background Technology

[0002] Chinese patent disclosure discloses a bottom-cover circuit board detachable smoke detector with application number CN202421221675.4. This bottom-cover circuit board detachable smoke detector includes: a detector housing, a button cover, a smoke detection circuit, a circuit board, a support assembly, and a bottom cover. The detector housing has a cover-like structure, and a support assembly is disposed inside the detector housing. The circuit board located inside the detector housing is mounted on the support assembly, and the smoke detection circuit is installed on the circuit board. The detector housing has a vent hole that connects the outside to the smoke detection circuit. A button cover is installed in the middle of the detector housing, aligning with the switch button in the smoke detection circuit. One side of the button cover is fixed to the detector housing, and the other side of the button cover forms a pressing gap with the detector housing. The bottom of the detector housing is sealed by the bottom cover.

[0003] Although this separate bottom cover circuit board smoke detector solves the problem of separating the button cover and the shell cover during mold making, the smoke detection circuit within the detector cannot be tested during production, resulting in the overall quality of the detector being compromised. Utility Model Content

[0004] This utility model provides an automatic smoke detection fixture circuit to solve the problem in the prior art that the smoke detection circuit in a separate smoke detector with a bottom cover circuit board cannot be detected.

[0005] To achieve the above objectives, this utility model adopts the following technical solution: This utility model discloses an automatic smoke detector detection fixture circuit, including: a power supply, an isolation voltage regulator module, a power control module, a first switch module, a voltage conversion module, a second switch module, a smoke sensor, and a control module; the first output terminal of the power supply outputs a 12V DC voltage, and the second output terminal of the power supply outputs a 5V DC voltage; the first output terminal of the power supply is connected to the input terminal of the isolation voltage regulator module; the power control module is provided with an action control unit and a switch unit; the action control unit is used to control the action of the switch unit; the output terminal of the isolation voltage regulator module is connected to the input terminal of the voltage conversion module through the switch unit in the power control module; the second output terminal of the power supply supplies power to the action control unit through the first switch module; the output terminal of the voltage conversion module is connected to the input terminal of the smoke sensor through the second switch module; the power supply terminal of the smoke sensor is powered by the second output terminal of the power supply; the output terminal of the smoke sensor is connected to the input terminal of the control module; the control terminal of the first switch module is connected to the first output terminal of the control module, and the control terminal of the second switch module is connected to the second output terminal of the control module.

[0006] Preferably, the isolation voltage regulator module includes: an isolation voltage regulator chip U1, a capacitor C1, and a capacitor C2. The Vin+ pin of the isolation voltage regulator chip U1 is the input terminal of the isolation voltage regulator module, and the Vin+ pin of the isolation voltage regulator chip U1 is connected to the positive terminal of the capacitor C1. The negative terminal of the capacitor C1 is connected to the Vin- pin of the isolation voltage regulator chip U1. The Vou+ pin of the isolation voltage regulator chip U1 is the output terminal of the isolation voltage regulator module, and the Vou+ pin of the isolation voltage regulator chip U1 is connected to the positive terminal of the capacitor C2. The negative terminal of the capacitor C2 is connected to the Vou- pin of the isolation voltage regulator chip U1.

[0007] Preferably, the power control module is a relay or a contactor, and the action control part of the relay or contactor is a coil.

[0008] Preferably, the switching unit is a single-pole double-throw switch, with the stationary terminal of the single-pole double-throw switch connected to the output terminal of the isolation voltage regulator module, the normally closed terminal of the single-pole double-throw switch left unused, and the normally open terminal of the single-pole double-throw switch connected to the input terminal of the voltage conversion module.

[0009] Preferably, the first switching module includes: a resistor R1, an npn transistor Q1, and a diode D1. The second output terminal of the power supply is connected to the positive terminal of the action control unit and the cathode of the diode D1. The negative terminal of the action control unit and the anode of the diode D1 are connected to the collector of the npn transistor Q1. The emitter of the npn transistor Q1 is grounded. The base of the npn transistor Q1 is connected to the first terminal of the resistor R1. The second terminal of the resistor R1 is the control terminal of the first switching module.

[0010] Preferably, the voltage conversion module includes: capacitors C3, C4, C5, C6, and C7; resistors R2, R3, R4, and R5; a step-down chip U2; an inductor L1; and an LED. The positive terminal of capacitor C3 is the input terminal of the voltage conversion module. The positive terminal of capacitor C3 is connected to the first terminal of resistor R2 and the IN pin of step-down chip U2. The negative terminal of capacitor C3 is grounded. The second terminal of resistor R2 is connected to the EN pin of step-down chip U2. The GND pin of step-down chip U2 is grounded. In step 2, the BST pin is connected to the first terminal of capacitor C4. The second terminal of capacitor C4 is connected to the SW pin of step-down chip U2 and inductor L1. The second terminal of inductor L1 is connected to the first terminal of resistor R3, the positive terminals of capacitors C5, C6, and C7, and the anode of LED. The second terminal of resistor R3 is connected to the FB pin of step-down chip U2 and the first terminal of resistor R4. The second terminal of resistor R4, the negative terminals of capacitors C5, C6, and C7 are all grounded. The cathode of LED is grounded through resistor R5.

[0011] Preferably, the second switching module includes: resistor R6, resistor R7, and npn transistor Q2. The first end of resistor R6 is the control terminal of the second switching module, the second end of resistor R6 is connected to the base of npn transistor Q2, the emitter of npn transistor Q2 is connected to the input terminal of the smoke sensor, the collector of npn transistor Q2 is connected to the first end of resistor R7, and the second end of resistor R7 is connected to the output terminal of the voltage conversion module.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] In this application, firstly, a power supply is set up to provide power, achieving a 12V DC voltage output at the first output terminal and a 5V DC voltage output at the second output terminal to meet the operating needs of different components. Then, an isolation voltage regulator module is designed to apply the stable 12V DC voltage output from the first output terminal of the power supply to the input terminal of the voltage conversion module via a switch in the power control module. This ensures a stable 12V DC voltage input to the voltage conversion module, guaranteeing a more stable voltage applied to the smoke sensor input terminal and preventing unstable voltage from affecting the smoke sensor's detection results, thus improving the reliability of the detection results. Next, a power control module is designed to control whether the 12V DC voltage is connected to the input terminal of the voltage conversion module. Finally, a second switch module is designed to control whether the smoke sensor is activated. After strictly controlling the input voltage of the smoke sensor, the smoke sensor is placed in a smoky environment. The smoke sensor changes its output according to the smoke concentration, and the control module determines the function of the smoke sensor based on the output, thereby achieving smoke sensor detection.

[0014] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0015] Figure 1 This is a circuit diagram of the isolation and voltage regulation module in the automatic smoke detection fixture circuit.

[0016] Figure 2 This is a circuit diagram of the power control module and the first switch module in the automatic smoke detection fixture circuit.

[0017] Figure 3 This is a circuit diagram of the voltage conversion module in the automatic smoke detection fixture circuit.

[0018] Figure 4 This is a circuit diagram of the second switch module and the smoke sensor in the automatic smoke detection fixture circuit. Detailed Implementation

[0019] To make the technical means, creative features, achieved objectives and functions of this utility model clearer and easier to understand, the utility model will be further described below with reference to the accompanying drawings and specific embodiments:

[0020] like Figures 1 to 4 As shown, this utility model discloses an automatic smoke detector detection fixture circuit, including: a power supply, an isolation voltage regulator module, a power control module, a first switch module, a voltage conversion module, a second switch module, a smoke sensor, and a control module; the first output terminal of the power supply outputs a 12V DC voltage, and the second output terminal of the power supply outputs a 5V DC voltage; the first output terminal of the power supply is connected to the input terminal of the isolation voltage regulator module; the power control module is provided with an action control unit and a switch unit, the action control unit is used to control the action of the switch unit; the output terminal of the isolation voltage regulator module is connected to the input terminal of the voltage conversion module through the switch unit in the power control module; the second output terminal of the power supply supplies power to the action control unit through the first switch module; the output terminal of the voltage conversion module is connected to the input terminal of the smoke sensor through the second switch module; the power supply terminal of the smoke sensor is powered by the second output terminal of the power supply; the output terminal of the smoke sensor is connected to the input terminal of the control module; the control terminal of the first switch module is connected to the first output terminal of the control module, and the control terminal of the second switch module is connected to the second output terminal of the control module.

[0021] The control module mainly uses STM32 series control chips, but other control chips can also be used.

[0022] The isolation voltage regulator module includes: an isolation voltage regulator chip U1, capacitors C1 and C2. The Vin+ pin of the isolation voltage regulator chip U1 is the input terminal of the module, connected to the positive terminal of capacitor C1, and the negative terminal of capacitor C1 is connected to the Vin- pin of the isolation voltage regulator chip U1. The Vou+ pin of the isolation voltage regulator chip U1 is the output terminal, connected to the positive terminal of capacitor C2, and the negative terminal of capacitor C2 is connected to the Vou- pin of the isolation voltage regulator chip U1. The isolation voltage regulator chip U1 uses a B1212S model chip, which has functions such as isolation, voltage regulation, overvoltage protection, and short-circuit protection, making the entire system more stable and reliable. Capacitors C1 and C2 mainly serve a voltage stabilization function.

[0023] The power control module RL1 is a relay or contactor, and the action control unit in the relay or contactor is a coil. Of course, it can also be other power control modules RL1 that have both an action control unit and a switching unit.

[0024] The switching section is a single-pole double-throw (SPO) switch. The stationary terminal of the SPO switch is connected to the output of the isolation voltage regulator module, the normally closed terminal is unconnected, and the normally open terminal is connected to the input of the voltage conversion module. The switching section can also be a normally open switch. When the action control unit is not energized, the stationary terminal and normally closed terminal of the SPO switch are connected; if it is a normally open switch, the normally open switch is open. When the action control unit is energized, the stationary terminal and normally open terminal of the SPO switch are connected; if it is a normally open switch, the normally open switch is closed.

[0025] In this application, the first switching module includes a resistor R1, an npn transistor Q1, and a diode D1. The second output terminal of the power supply is connected to the positive terminal of the action control unit and the cathode of the diode D1. The negative terminal of the action control unit and the anode of the diode D1 are connected to the collector of the npn transistor Q1. The emitter of the npn transistor Q1 is grounded, and the base of the npn transistor Q1 is connected to the first terminal of the resistor R1. The second terminal of the resistor R1 is the control terminal of the first switching module. The npn transistor Q1 closes the circuit when the second terminal of the resistor R1 is at a high level and opens the circuit when the second terminal of the resistor R1 is at a low level.

[0026] In this application, the voltage conversion module includes: capacitors C3, C4, C5, C6, and C7; resistors R2, R3, R4, and R5; a step-down chip U2; an inductor L1; and a light-emitting diode (LED). The positive terminal of capacitor C3 is the input terminal of the voltage conversion module. The positive terminal of capacitor C3 is connected to the first terminal of resistor R2 and the IN pin of the step-down chip U2. The negative terminal of capacitor C3 is grounded. The second terminal of resistor R2 is connected to the EN pin of the step-down chip U2. The GND pin of the step-down chip U2 is grounded. In step 2, the BST pin is connected to the first terminal of capacitor C4. The second terminal of capacitor C4 is connected to the SW pin of step-down chip U2 and inductor L1. The second terminal of inductor L1 is connected to the first terminal of resistor R3, the positive terminals of capacitors C5, C6, and C7, and the anode of LED. The second terminal of resistor R3 is connected to the FB pin of step-down chip U2 and the first terminal of resistor R4. The second terminal of resistor R4, the negative terminals of capacitors C5, C6, and C7 are all grounded. The cathode of LED is grounded through resistor R5. Step-down chip U2 uses an ETA8120 chip, but other chips with step-down functionality can also be used. Step-down chip U2 reduces 12V DC voltage to 3V DC voltage.

[0027] The second switching module includes resistors R6 and R7, and an NPN transistor Q2. The first terminal of resistor R6 is the control terminal of the second switching module. The second terminal of resistor R6 is connected to the base of NPN transistor Q2. The emitter of NPN transistor Q2 is connected to the input terminal of the smoke sensor. The collector of NPN transistor Q2 is connected to the first terminal of resistor R7. The second terminal of resistor R7 is connected to the output terminal of the voltage conversion module. When the first terminal of resistor R4 is at a high level, NPN transistor Q2 is closed; when the first terminal of resistor R4 is at a low level, NPN transistor Q2 is open.

[0028] The smoke sensor includes: a smoke sensor chip U3, a capacitor C8, and a resistor R8. The Vin+ pin of the smoke sensor chip U3 is the input terminal, the Vo pin is the output terminal, the VCC pin is the power supply terminal, the Vin- pin is grounded, the VCC pin is connected to the positive terminal of capacitor C8 and the first terminal of resistor R8, the second terminal of resistor R8 is connected to the Vo pin of the smoke sensor chip U3, and the GND pin of the smoke sensor chip U3 and the negative terminal of capacitor C8 are both grounded. The smoke sensor chip U3 can be a 6N137DM model.

[0029] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. An automatic smoke detection fixture circuit, characterized in that, include: The power supply, isolation voltage regulator module, power control module, first switch module, voltage conversion module, second switch module, smoke sensor, and control module; The first output terminal of the power supply outputs 12V DC voltage, and the second output terminal of the power supply outputs 5V DC voltage. The first output terminal of the power supply is connected to the input terminal of the isolation voltage regulator module. The power control module is equipped with an action control unit and a switch unit. The action control unit is used to control the action of the switch unit. The output terminal of the isolation voltage regulator module is connected to the input terminal of the voltage conversion module through the switch unit in the power control module. The second output terminal of the power supply supplies power to the action control unit through the first switch module. The output terminal of the voltage conversion module is connected to the input terminal of the smoke sensor through the second switch module. The power supply terminal of the smoke sensor is powered by the second output terminal of the power supply. The output terminal of the smoke sensor is connected to the input terminal of the control module. The control terminal of the first switch module is connected to the first output terminal of the control module, and the control terminal of the second switch module is connected to the second output terminal of the control module.

2. The automatic smoke detector detection fixture circuit according to claim 1, characterized in that, The isolation voltage regulator module includes: an isolation voltage regulator chip U1, capacitor C1, and capacitor C2. The Vin+ pin of the isolation voltage regulator chip U1 is the input terminal of the isolation voltage regulator module. The Vin+ pin of the isolation voltage regulator chip U1 is connected to the positive terminal of capacitor C1, and the negative terminal of capacitor C1 is connected to the Vin- pin of the isolation voltage regulator chip U1. The Vou+ pin of the isolation voltage regulator chip U1 is the output terminal of the isolation voltage regulator module. The Vou+ pin of the isolation voltage regulator chip U1 is connected to the positive terminal of capacitor C2, and the negative terminal of capacitor C2 is connected to the Vou- pin of the isolation voltage regulator chip U1.

3. The automatic smoke detector detection fixture circuit according to claim 2, characterized in that, The power control module is a relay or contactor, and the action control part of the relay or contactor is a coil.

4. The automatic smoke detector detection fixture circuit according to claim 3, characterized in that, The switching section is a single-pole double-throw switch. The stationary terminal of the single-pole double-throw switch is connected to the output terminal of the isolation voltage regulator module, the normally closed terminal of the single-pole double-throw switch is left unused, and the normally open terminal of the single-pole double-throw switch is connected to the input terminal of the voltage conversion module.

5. The automatic smoke detector detection fixture circuit according to claim 3 or 4, characterized in that, The first switching module includes: a resistor R1, an npn transistor Q1, and a diode D1. The second output terminal of the power supply is connected to the positive terminal of the action control unit and the cathode of the diode D1. The negative terminal of the action control unit and the anode of the diode D1 are connected to the collector of the npn transistor Q1. The emitter of the npn transistor Q1 is grounded. The base of the npn transistor Q1 is connected to the first terminal of the resistor R1. The second terminal of the resistor R1 is the control terminal of the first switching module.

6. The automatic smoke detector detection fixture circuit according to claim 5, characterized in that, The voltage conversion module includes: capacitors C3, C4, C5, C6, and C7; resistors R2, R3, R4, and R5; a step-down chip U2; an inductor L1; and an LED. The positive terminal of capacitor C3 is the input terminal of the voltage conversion module. The positive terminal of capacitor C3 is connected to the first terminal of resistor R2 and the IN pin of the step-down chip U2. The negative terminal of capacitor C3 is grounded. The second terminal of resistor R2 is connected to the EN pin of the step-down chip U2. The GND pin of the step-down chip U2 is grounded. The B pin of the step-down chip U2... The ST pin is connected to the first terminal of capacitor C4. The second terminal of capacitor C4 is connected to the SW pin of the buck converter chip U2 and inductor L1. The second terminal of inductor L1 is connected to the first terminal of resistor R3, the positive terminals of capacitors C5, C6, and C7, and the anode of LED. The second terminal of resistor R3 is connected to the FB pin of the buck converter chip U2 and the first terminal of resistor R4. The second terminal of resistor R4, the negative terminals of capacitors C5, C6, and C7 are all grounded. The cathode of LED is grounded through resistor R5.

7. The automatic smoke detector detection fixture circuit according to claim 6, characterized in that, The second switching module includes: resistor R6, resistor R7, and npn transistor Q2. The first end of resistor R6 is the control terminal of the second switching module, the second end of resistor R6 is connected to the base of npn transistor Q2, the emitter of npn transistor Q2 is connected to the input terminal of the smoke sensor, the collector of npn transistor Q2 is connected to the first end of resistor R7, and the second end of resistor R7 is connected to the output terminal of the voltage conversion module.

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