阅读说明：本技术 负载着火报警电路 (Load fire alarm circuit ) 是由 张立军 赵马锋 吴双龙 于 2019-09-27 设计创作，主要内容包括：本发明涉及电路保护技术领域,特别是公开了一种负载着火报警电路,包括电源电路模块、故障信号采集模块、处理电路模块、触发电路模块、电源指示电路模块和故障报警电路模块,所述故障信号采集模块包括烟雾检测传感器MQ1,电源电路模块给故障信号采集模块供电,所述故障报警电路模块包括RC降压电路、整流滤波稳压电路、复位开关S1、故障指示灯LED2、限流电阻R11、继电器K1以及可控硅SCR1。采用上述结构,提供了一种在断路器负载侧过载或接线松动等原因线路起火后,触发装置触发脱扣器跳闸(也可以设定不跳闸),输出起火报警信号的负载着火报警电路。(The invention relates to the technical field of circuit protection, and particularly discloses a load fire alarm circuit which comprises a power circuit module, a fault signal acquisition module, a processing circuit module, a trigger circuit module, a power indication circuit module and a fault alarm circuit module, wherein the fault signal acquisition module comprises a smoke detection sensor MQ1, the power circuit module supplies power to the fault signal acquisition module, and the fault alarm circuit module comprises an RC voltage reduction circuit, a rectification filtering voltage stabilizing circuit, a reset switch S1, a fault indicator lamp LED2, a current limiting resistor R11, a relay K1 and a silicon controlled rectifier SCR 1. By adopting the structure, the load firing alarm circuit is provided, wherein after the circuit is fired due to overload on the load side of the circuit breaker or loose wiring and other reasons, the trigger device triggers the tripper to trip (can also be set to not trip), and outputs a firing alarm signal.)

1. A load fire alarm circuit, characterized by: the smoke detection circuit comprises a power supply circuit module, a fault signal acquisition module, a processing circuit module, a trigger circuit module, a power supply indicating circuit module and a fault alarm circuit module, wherein the fault signal acquisition module comprises a smoke detection sensor MQ1, the power supply circuit module supplies power to the smoke detection sensor MQ1, the processing circuit module comprises a resistor R8, a resistor R9, a capacitor C8, a potentiometer VR1 and a signal processing chip U1, pins 4 and 6 of the smoke detection sensor MQ1 are connected to pins 6 of the signal processing chip U1, one ends of the resistor R8 and the capacitor C8 are connected to the pin 6 of the signal processing chip U1, the other end of the resistor R9 is grounded, one end of the resistor R9 is connected to the pin 5 of the smoke detection sensor MQ1, the other end of the resistor R9 is connected in an abutting joint, the trigger circuit module comprises an optical coupler OP1, a resistor R7, a capacitor C6 and a capacitor C7, the capacitor C6 is connected to the input side of an optical coupler OP1 in parallel, the resistor, the other end of the capacitor C7 is grounded, the common end of the resistor R7 and the capacitor C7 is connected to the pin 7 of the signal processing chip U1, the fault alarm circuit module comprises an RC voltage reduction circuit, a rectification filtering voltage stabilizing circuit, a reset switch S1, a fault indicator light LED2, a current limiting resistor R11, a relay K1 and a silicon controlled rectifier SCR1, the current limiting resistor R11 and the fault indicator light LED2 are connected in series and then connected in parallel with the relay K1, the anode of the silicon controlled rectifier SCR1 is connected with the fault indicator light LED2, the control electrode is connected with the three pins of the optical coupler OP1, one end of the reset switch S1 is connected with the rectification filtering voltage stabilizing circuit, and the other end is connected with the resistor.

2. The load fire alarm circuit of claim 1, wherein: the power indication circuit module comprises a Light Emitting Diode (LED) 1 and a resistor R6, and the power indication circuit is connected with the input side of an optical coupler OP 1.

3. The load fire alarm circuit according to claim 1 or 2, wherein: a resistor R12 is connected between the control electrode of the controlled silicon SCR1 and the three pins of the optocoupler OP1, a capacitor C14 is also connected to the control electrode of the controlled silicon SCR1, and the other end of the capacitor C14 is grounded.

4. The load fire alarm circuit of claim 3, wherein: the RC voltage reduction circuit comprises a resistor R10 and a capacitor C9, and the rectification filtering voltage stabilizing circuit comprises a rectifier bridge DB1, a voltage regulator tube Z2, a capacitor C10, a capacitor C11, a three-terminal voltage regulator tube Z3, a capacitor C12 and a capacitor C13.

5. The load fire alarm circuit of claim 3, wherein: the power circuit module comprises a rectification filter circuit, an oscillating circuit, a voltage stabilizing output circuit, an overcurrent protection circuit and a voltage output circuit.

6. The load fire alarm circuit of claim 3, wherein: the rectification filter circuit comprises a rectifier diode D1 and a capacitor C1, the rectification filter circuit comprises a resistor R2, a triode Q1, a coil L1, a feedback coil L2, a capacitor C4 and a resistor R5, and the voltage-stabilizing output circuit comprises a voltage-stabilizing tube Z1, a diode D4 and a capacitor C3.

7. The load fire alarm circuit of claim 3, wherein: the positive feedback circuit comprises a resistor R5 and a capacitor C4.

8. The load fire alarm circuit of claim 3, wherein: the overcurrent protection circuit comprises a triode Q2, a diode D3 and a current sampling resistor R4.

9. The load fire alarm circuit of claim 3, wherein: the voltage output circuit comprises a rectifying diode D5 and a filter capacitor C5.

10. The load fire alarm circuit according to any one of claims 4-9, wherein: a trip module is also included, including a trip TQ 1.

Technical Field

The invention relates to the technical field of circuit protection, in particular to a protection circuit for a load circuit to cause faults caused by circuit combustion due to overload or loose wiring and the like.

Background

At present, in current circuit breaker product, after the load side leads to the wire to fire the burning because of transshipping or reason such as wiring is not hard up, because of some overcurrent do not reach the tripping operation condition of circuit breaker, so the circuit breaker does not trip to lead to whole block terminal to be burnt, perhaps the product tripping operation, but no signal feedback leads to the customer to be unknown, and the fault loss enlargements.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention provides a load fire alarm circuit, which is characterized in that after a circuit is on fire due to overload on the load side of a circuit breaker or loose wiring and the like, a trigger device triggers a release to trip (or can be set to not trip), and a fire alarm signal is output.

In order to achieve the purpose, the invention adopts the technical scheme that: a load fire alarm circuit comprises a power supply circuit module, a fault signal acquisition module, a processing circuit module, a trigger circuit module, a power supply indication circuit module and a fault alarm circuit module, wherein the fault signal acquisition module comprises a smoke detection sensor MQ1, the power supply circuit module supplies power to the smoke detection sensor MQ1, the processing circuit module comprises a resistor R8, a resistor R9, a capacitor C8, a potentiometer VR1 and a signal processing chip U1, 4 pins and 6 pins of the smoke detection sensor MQ1 are connected to 6 pins of the signal processing chip U1, one ends of the resistor R8 and the capacitor C8 are connected to 6 pins of the signal processing chip U1, the other end of the resistor R9 is grounded, one end of the resistor R9 is connected to 5 pins of the smoke detection sensor MQ1, the other end of the resistor R9 is connected to the ground, the other end of the trigger circuit module is connected to the ground, the trigger circuit module comprises an optical coupler OP1, a resistor R7, a capacitor C6 and, the fault alarm circuit module comprises an RC voltage reduction circuit, a rectification filtering voltage stabilizing circuit, a reset switch S1, a fault indicator lamp LED2, a current limiting resistor R11, a relay K1 and a controlled silicon SCR1, wherein the current limiting resistor R11 and the fault indicator lamp LED2 are connected in series and then connected in parallel with the relay K1, the anode of the controlled silicon SCR1 is connected with a fault indicator lamp LED2, the control electrode of the controlled silicon SCR1 is connected with three pins of the optical coupler OP1, one end of the reset switch S1 is connected with the rectification filtering voltage stabilizing circuit, and the other end of the reset switch S1 is connected with the resistor R11.

In the structure, the smoke detection sensor MQ1 initiates signal detection, the resistor R8 is a sampling resistor and provides reference voltage for the smoke detection sensor MQ1, the potentiometer VR1 is used for adjusting the sampling precision of the smoke detection sensor MQ1, the optical coupler OP1 is used for controlling whether a silicon controlled rectifier SCR1 on the fault alarm circuit module is conducted or not, other resistors play a current limiting role, and the capacitor plays an anti-interference role.

As a further arrangement of the present invention, the power indication circuit module includes a light emitting diode LED1 and a resistor R6, and the power indication circuit is connected to an input side of the optical coupler OP 1.

In the structure, the power supply indicating circuit module is used for indicating that the working power supply of the smoke detection sensor MQ1 is normal, the resistor R6 is a current-limiting resistor, and when the power supply is normal, the light-emitting diode LED1 emits light.

As a further arrangement of the invention, a resistor R12 is connected between the control electrode of the thyristor SCR1 and the three pins of the optocoupler OP1, a capacitor C14 is further connected to the control electrode of the thyristor SCR1, and the other end of the capacitor C14 is grounded.

In the structure, the controlled silicon SCR1 is used for controlling the relay K1 to be conducted and the fault indicator light LED2 to be bright, the three-pin control controlled silicon SCR1 of the optocoupler OP1 is used as a control pin, the resistor R12 is a current-limiting resistor, and the capacitor C14 plays an anti-interference role and prevents misconduction.

As a further arrangement of the invention, the RC voltage reduction circuit comprises a resistor R10 and a capacitor C9, and the rectification, filtering and voltage stabilizing circuit comprises a rectifier bridge DB1, a voltage regulator tube Z2, a capacitor C10, a capacitor C11, a three-terminal voltage regulator tube Z3, a capacitor C12 and a capacitor C13.

In the structure, the resistor R10 and the capacitor C9 form an RC voltage reduction circuit, the RC voltage reduction circuit is changed into direct current through a rectifier bridge DB1, the direct current is changed into DC24V direct current through a voltage regulator tube Z2, the direct current is filtered through the capacitor C10 and the capacitor C11, 24V is changed into 12V through a three-terminal voltage regulator tube Z3, and the capacitor C12 and the capacitor C13 play a role in filtering.

As a further configuration of the present invention, the power circuit module includes a rectifying and filtering circuit, an oscillating circuit, a voltage stabilizing output circuit, an overcurrent protection circuit, and a voltage output circuit.

As a further configuration of the present invention, the rectifying and filtering circuit includes a rectifying diode D1 and a capacitor C1, the oscillating circuit includes a resistor R2, a transistor Q1, a coil L1, a feedback coil L2, a capacitor C4, and a resistor R5, and the regulated output circuit includes a voltage regulator tube Z1, a diode D4, and a capacitor C3.

In the above structure, the rectifying and filtering circuit belongs to a half-wave rectifying circuit, outputs pulsating direct current voltage, and becomes direct current voltage through capacitance filtering, and the rectifying and filtering circuit is a magnetic field for forming changes in the switching transformer, thereby generating induced voltage in the secondary winding, and the diode D4 is switched on when the triode Q1 is cut off: the positive pole of the feedback coil L2, the positive pole of the capacitor C3 and the positive pole of the diode D4 form a loop; the voltage of the capacitor C3 is up + down-, voltage-6 v, the upper end is connected with the ground potential 0v, the lower end potential-6 v is a sampling voltage, the voltage regulator tube Z1 is required to be conducted, the left end potential of the voltage regulator tube Z1 is 0.2v, when the voltage is increased, the voltage of the capacitor C3 is increased, namely the lower end potential is lower than-6 v, the voltage of the two ends of the voltage regulator tube Z1 is unchanged, so the left end potential is pulled down to be lower than 0.2v, the base potential of the triode Q1 is pulled down, the saturation time of the triode Q1 is shortened, and the voltage-stabilizing output effect is achieved.

According to the invention, as a further arrangement, the overcurrent protection circuit comprises a transistor Q2, a diode D3 and a current sampling resistor R4.

In the structure, when the current of the triode Q1 is larger than 0.16A, the current is changed into voltage through the current sampling resistor R4, and the voltage is added to the base electrode of the triode Q2 to be conducted after passing through the diode D3, so that the base electrode voltage of the triode Q1 is pulled down, the collector current is reduced, the current of the triode Q1 is limited, the current is prevented from being burnt due to overlarge current, and the overcurrent protection effect is achieved.

As a further arrangement of the invention, the voltage output circuit comprises a rectifier diode D5 and a filter capacitor C5.

In the structure, after rectification by the rectifier diode D5 and filtering by the filter capacitor C5, direct current power supply is provided for the following circuit.

As a further arrangement of the present invention, a trip module is further included, and the trip module includes a trip TQ 1.

In the structure, the tripper TQ1 is used for playing the role of pulling and tripping the circuit breaker together with the circuit breaker mechanism to trip the circuit breaker.

By adopting the structure, when the circuit breaker causes circuit burning due to overload or loose wiring and the like, the overload current multiple does not reach the overload multiple of the circuit breaker, the circuit breaker can not trip to cut off a power supply or give an alarm, at the moment, the circuit is electrified, so that the fault is aggravated and a user does not know that the circuit has a fault and can not process the circuit fault in time, and the fault is aggravated to form larger damage and property loss.

The invention is further described below with reference to the accompanying drawings.

Drawings

FIG. 1 is a circuit diagram of a power circuit module according to an embodiment of the present invention;

FIG. 2 is a circuit diagram of a fault signal acquisition module, a processing circuit module, and a trigger circuit module according to an embodiment of the present invention;

fig. 3 is a circuit diagram of a fault alarm circuit module in accordance with an embodiment of the present invention.

Detailed Description

The specific embodiment of the invention is shown in fig. 1-3, a load fire alarm circuit, which comprises a power circuit module, a fault signal acquisition module, a processing circuit module, a trigger circuit module, a power indication circuit module and a fault alarm circuit module, wherein the fault signal acquisition module comprises a smoke detection sensor MQ1, the power circuit module supplies power to the smoke detection sensor MQ1, the processing circuit module comprises a resistor R8, a resistor R9, a capacitor C8, a potentiometer VR1 and a signal processing chip U1, the 4 pins and the 6 pins of the smoke detection sensor MQ1 are connected to the 6 pins of the signal processing chip U1, one ends of the resistor R8 and the capacitor C8 are connected to the 6 pins of the signal processing chip U1, the other end is grounded, one end of the resistor R9 is connected to the 5 pins of the smoke detection sensor MQ1, the other end is abutted, the trigger circuit module comprises an optical coupler OP1, a resistor R7, a smoke detection sensor MQ, The fault alarm circuit module comprises an RC voltage reduction circuit, a rectification filtering voltage stabilizing circuit, a reset switch S1, a fault indicator light LED2, a current limiting resistor R11, a relay K1 and a silicon controlled rectifier SCR1, wherein the resistor R7 and the common end of the capacitor C7 are connected to a pin 7 of a signal processing chip U1, the fault alarm circuit module comprises an RC voltage reduction circuit, a rectification filtering voltage stabilizing circuit, a reset switch S1, a fault indicator light LED2, a current limiting resistor R11, a relay K1 and a silicon controlled rectifier SCR1, the current limiting resistor R11 and the fault indicator light LED2 are connected in series and then connected in parallel with a relay K1, the anode of the silicon controlled rectifier SCR1 is connected with the fault indicator light LED2, the control pole is connected with a three-pin of the optocoupler OP1, one end of the reset switch S1 is connected with the rectification filtering voltage stabilizing circuit, and the other end of the resistor R36. The smoke detection sensor MQ1 initiates signal detection, the resistor R8 is a sampling resistor and provides reference voltage for the smoke detection sensor MQ1, the potentiometer VR1 is used for adjusting the sampling precision of the smoke detection sensor MQ1, the optocoupler OP1 is used for controlling whether a silicon controlled rectifier SCR1 on the fault alarm circuit module is conducted or not, other resistors play a current limiting role, and the capacitor plays an anti-interference role.

The power indication circuit module comprises a Light Emitting Diode (LED) 1 and a resistor R6, and the power indication circuit is connected with the input side of an optical coupler OP 1. The power supply indicating circuit module is used for indicating that the working power supply of the smoke detection sensor MQ1 is normal, the resistor R6 is a current-limiting resistor, and when the power supply is normal, the light-emitting diode LED1 emits light.

A resistor R12 is connected between the control electrode of the controlled silicon SCR1 and the three pins of the optocoupler OP1, a capacitor C14 is also connected to the control electrode of the controlled silicon SCR1, and the other end of the capacitor C14 is grounded. Silicon controlled rectifier SCR1 is used for controlling relay K1 to switch on and fault indicator LED2 is bright, and the tripod control silicon controlled rectifier SCR 1's of opto-coupler OP1 control foot, and resistance R12 is the current-limiting resistor, and electric capacity C14 plays the anti-jamming effect, prevents the misconnection.

The RC voltage reduction circuit comprises a resistor R10 and a capacitor C9, and the rectification, filtering and voltage stabilizing circuit comprises a rectifier bridge DB1, a voltage regulator tube Z2, a capacitor C10, a capacitor C11, a three-terminal voltage regulator tube Z3, a capacitor C12 and a capacitor C13. The resistor R10 and the capacitor C9 form an RC voltage reduction circuit, the RC voltage reduction circuit is changed into direct current through a rectifier bridge DB1, the direct current is changed into DC24V direct current through a voltage regulator tube Z2, the direct current is filtered through a capacitor C10 and a capacitor C11, 24V is changed into 12V through a three-terminal voltage regulator tube Z3, and the capacitor C12 and the capacitor C13 play a role in filtering.

The power circuit module comprises a rectification filter circuit, an oscillating circuit, a voltage stabilizing output circuit, an overcurrent protection circuit and a voltage output circuit.

The rectification filter circuit comprises a rectifier diode D1 and a capacitor C1, the rectification filter circuit comprises a resistor R2, a triode Q1, a coil L1, a feedback coil L2, a capacitor C4 and a resistor R5, and the voltage stabilizing output circuit comprises a voltage stabilizing tube Z1, a diode D4 and a capacitor C3. Rectifier filter circuit belongs to half-wave rectifier circuit, and output pulse direct current voltage becomes direct current voltage through capacitance filtering, and the circuit of making an uproar is for forming the magnetic field of change among the switching transformer to produce induced voltage in secondary winding, diode D4 switches on when triode Q1 ends: the positive pole of the feedback coil L2, the positive pole of the capacitor C3 and the positive pole of the diode D4 form a loop; the voltage of the capacitor C3 is up + down-, voltage-6 v, the upper end is connected with the ground potential 0v, the lower end potential-6 v is a sampling voltage, the voltage regulator tube Z1 is required to be conducted, the left end potential of the voltage regulator tube Z1 is 0.2v, when the voltage is increased, the voltage of the capacitor C3 is increased, namely the lower end potential is lower than-6 v, the voltage of the two ends of the voltage regulator tube Z1 is unchanged, so the left end potential is pulled down to be lower than 0.2v, the base potential of the triode Q1 is pulled down, the saturation time of the triode Q1 is shortened, and the voltage-stabilizing output effect is achieved.

The overcurrent protection circuit comprises a triode Q2, a diode D3 and a current sampling resistor R4. When the current of the triode Q1 is larger than 0.16A, the current is changed into voltage through the current sampling resistor R4, and the voltage is added to the base electrode of the triode Q2 to be conducted after passing through the diode D3, so that the base electrode voltage of the triode Q1 is pulled down, the collector current is reduced, the current of the triode Q1 is limited, the current is prevented from being burnt due to overlarge current, and the overcurrent protection effect is achieved.

The voltage output circuit comprises a rectifying diode D5 and a filter capacitor C5. After being rectified by a rectifying diode D5 and filtered by a filter capacitor C5, the direct current power supply is provided for a following circuit.

A trip module is also included, including a trip TQ 1. The tripper TQ1 is used for pulling and tripping the breaker in cooperation with the breaker mechanism to trip the breaker.

The circuit principle is as follows: the 230V alternating current is subjected to half-wave rectification through a diode D1, after C1 is filtered, the alternating current is transformed through a T1 high-frequency transformer to provide a required power supply for MQ1, when the alternating current is normal, the conductivities of pins 1 and 3 and pins 4 and 6 of the MQ1 are very low and are in a high-resistance state, the pin U1_6 is at a low level, the pin U1_7 outputs a high level at the moment, an optical coupler OP1 is not conducted, the controlled electrode of a silicon controlled rectifier is at a low level and is not conducted, a coil of a relay K1 is not. The tripper is not moved, when the circuit is ignited and burnt due to overload or loose wiring and the like, after the MQ1 detects a fault signal, the resistance values of pins 1, 3 and 4 and 6 of the MQ1 become small, the high level of the pin U1_6 is realized, the low level is output by the pin U1_7 at the moment, the optical coupler OP1 is conducted, the control electrode of the silicon controlled rectifier is conducted by conducting OP1_4 and OP1_3 at the moment, the silicon controlled rectifier is conducted, the coil of the relay K1 is electrified to act, the normally open contact is closed, the normally closed contact is opened, the tripper TQ is electrified, the circuit breaker is tripped (can not trip and outputs an alarm signal), the indicating lamp is turned on to tell a user that the fault is eliminated as soon as possible, and when the user knows the fault, the alarm device.

The present invention is not limited to the above embodiments, and those skilled in the art can implement the present invention in other embodiments according to the disclosure of the present invention, or make simple changes or modifications on the design structure and idea of the present invention, and fall into the protection scope of the present invention.