Indicative switch

Abstract

The utility model provides an indicating switch which comprises a switch body and an indicating unit, and the indicating unit comprises an induction coil, a rectification filtering module, a voltage stabilizing circuit, a work indicating module, an energy storage capacitor, a fault indicating module and a switching control module. The induction coil is arranged on a live wire of a tested power supply loop, the dotted terminal of the induction coil is connected to the input end of the rectification filtering module, the other end of the induction coil is grounded, the output end of the rectification filtering module is connected to the input end of the voltage stabilizing circuit through the switching control module, and the output end of the voltage stabilizing circuit is grounded through the energy storage capacitor. A common connection point between the output end of the voltage stabilizing circuit and the energy storage capacitor is connected to the work indication module and the fault indication module through the switching control module; the switching control circuit detects a short-circuit fault of the detected power supply loop according to the output current of the rectification filtering module, controls the work indication module to work when the detected power supply loop is normal, and controls the fault indication module to work when the detected power supply loop is short-circuited.

Description

Technical Field

[0001] This utility model relates to an electricity usage indication and early warning system, and more particularly to an indicator switch. Background Technology

[0002] In household electricity use, circuit breakers, which serve as power supply protection, are typically connected in parallel to multiple power supply circuits, such as lighting power supply circuits, with one switch installed for each lighting power supply circuit.

[0003] When a short circuit fault occurs in one of the many parallel circuits under the jurisdiction of an air switch, the air switch will activate short circuit protection. At this time, all power supply circuits under the jurisdiction of the air switch are de-energized, making it difficult to determine which power supply circuit has a short circuit fault. To identify the specific power supply circuit with a short circuit fault, certain specialized equipment and expertise are required for identification and confirmation, resulting in low identification efficiency and affecting short circuit fault repair.

[0004] Therefore, in order to solve the above-mentioned technical problems, it is urgent to propose a new technical approach. Utility Model Content

[0005] In view of this, the purpose of this utility model is to provide an indicative switch that can promptly detect which of the many parallel circuits under the jurisdiction of the air switch has a short circuit fault after the air switch performs short circuit protection, and can accurately warn of the short circuit fault, so as to notify the user in time, facilitate subsequent maintenance, and avoid the safety hazards that exist when troubleshooting short circuit faults in traditional technology.

[0006] This utility model provides an indicator switch, including a switch body and an indicator unit. The indicator unit includes an induction coil, a rectifier filter module, a voltage regulator circuit, a working indicator module, an energy storage capacitor C2, a fault indicator module, and a switching control module.

[0007] The induction coil is set on the live wire of the switch. The same-name end of the induction coil is connected to the input end of the rectifier and filter module. The other end of the induction coil is grounded. The output end of the rectifier and filter module is connected to the input end of the voltage regulator circuit through the switching control module. The output end of the voltage regulator circuit is grounded through the energy storage capacitor C2. The common connection point between the output end of the voltage regulator circuit and the energy storage capacitor C2 is connected to the working indicator module and the fault indicator module through the switching control module.

[0008] The switching control module detects short-circuit faults in the power supply circuit under test based on the output current of the rectifier and filter module. When the power supply circuit under test is normal, the switching control circuit controls the operation indicator module to work. When the power supply circuit under test is short-circuited, the switching control circuit controls the fault indicator module to work.

[0009] Furthermore, the switching control module includes a short-circuit detection circuit and a switching control circuit;

[0010] The input terminal of the short-circuit detection circuit is connected to the output terminal of the rectifier filter module, the output terminal of the short-circuit detection circuit is connected to the input terminal of the voltage regulator circuit, the control output terminal of the short-circuit detection circuit is connected to the control input terminal of the switching control circuit, the first power input terminal and the second power input terminal of the switching control circuit are both connected to the common connection point between the output terminal of the voltage regulator circuit and the energy storage capacitor C2, the first power output terminal of the switching control circuit supplies power to the working indicator module, and the second power output terminal of the switching control circuit supplies power to the fault indicator module.

[0011] Furthermore, the short-circuit detection circuit includes resistor R1, inductor L1, resistor R3, resistor R4, transistor T3, and resistor R6;

[0012] One end of resistor R1 serves as the input terminal of the short-circuit detection circuit, and the other end of resistor R1 is connected to one end of inductor L1, with the other end of inductor L1 serving as the output terminal of the short-circuit detection circuit.

[0013] One end of resistor R3 is connected to the common connection point between resistor R1 and inductor L1. The other end of resistor R3 is connected to the base of transistor T3. The emitter of transistor T3 is connected to inductor L1 through resistor R4 as one end of the output terminal of the short circuit detection circuit. The collector of transistor T3 is connected to one end of resistor R6. The other end of resistor R6 serves as the control output terminal of the short circuit detection circuit.

[0014] Among them, transistor T3 is a P-type transistor.

[0015] Furthermore, the switching control circuit includes a transistor T2, a silicon controlled rectifier Q2, and a resistor R8;

[0016] The collector of transistor T2 serves as the first power input terminal of the switching control circuit, the emitter of transistor T2 serves as the first power output terminal of the switching control circuit, and the base of transistor T2 is connected to the output terminal of the rectifier filter circuit through resistor R8;

[0017] The anode of the thyristor Q2 serves as the second power input terminal of the switching control circuit, the cathode of the thyristor Q2 serves as the second power output terminal of the switching control circuit, and the controller of the thyristor Q2 serves as the control output terminal of the switching control circuit.

[0018] Furthermore, the rectifier and filter module includes a rectifier diode D1 and a filter capacitor C1;

[0019] The anode of rectifier diode D1 is connected to the same terminal of the induction coil, and the cathode of rectifier diode D1 is grounded through filter capacitor C1. The common connection point between the cathode of rectifier diode D1 and filter capacitor C1 serves as the output terminal of the rectifier filter module.

[0020] Furthermore, the switching control circuit also includes a discharge circuit, which includes a thyristor Q1 and a resistor R2. The anode of the thyristor Q1 is connected to the common connection point between the cathode of the rectifier diode D1 and the filter capacitor C1. The cathode of the thyristor Q1 is grounded through the resistor R2. The control electrode of the thyristor Q1 is connected to the control output terminal of the short-circuit detection circuit.

[0021] Furthermore, the voltage regulator circuit includes resistor R5, resistor R6, transistor T1, and Zener diode DW2;

[0022] The collector of transistor T1 serves as the input terminal of the voltage regulator circuit, and the emitter of transistor T1 serves as the output terminal of the voltage regulator circuit. The collector of transistor T1 is connected to the base of transistor T1 through resistor R5. The base of transistor T1 is connected to the cathode of Zener diode DW2, and the anode of Zener diode DW2 is grounded.

[0023] Furthermore, the working indicator module includes a resistor R7 and an indicator LED2;

[0024] One end of resistor R7 serves as the input terminal of the working indicator module, and the other end of resistor R7 is connected to the positive terminal of indicator LED2. The negative terminal of indicator LED2 is grounded.

[0025] Furthermore, the fault indication module includes a resistor R2, an indicator LED1, and a buzzer SP;

[0026] One end of resistor R2 serves as the input terminal of the fault indication module, and the other end of resistor R2 is connected to the positive terminal of indicator LED1 and the input terminal of buzzer SP. The negative terminal of indicator LED1 is grounded, and the output terminal of buzzer SP is grounded.

[0027] The beneficial effects of this utility model are as follows: This utility model can promptly detect which of the many parallel circuits under the jurisdiction of the air switch has a short circuit fault after the air switch performs short circuit protection, and can accurately warn of the short circuit fault, thereby notifying the user in a timely manner, facilitating subsequent maintenance and handling, and avoiding the safety hazards that exist when troubleshooting short circuit faults in traditional technologies. Attached Figure Description

[0028] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0029] Figure 1 This is a schematic diagram of the principle of this utility model.

[0030] Figure 2 This is the circuit schematic diagram of this utility model.

[0031] Figure 3 This is a schematic diagram of the switch of this utility model.

[0032] Figure 4 This is a schematic diagram of the induction coil structure of this utility model. Detailed Implementation

[0033] The present invention will be further described in detail below:

[0034] This utility model provides an indicator switch, including a switch body and an indicator unit. The indicator unit includes an induction coil, a rectifier filter module, a voltage regulator circuit, a working indicator module, an energy storage capacitor C2, a fault indicator module, and a switching control module.

[0035] The induction coil is set on the live wire of the switch. The same-name end of the induction coil is connected to the input end of the rectifier and filter module. The other end of the induction coil is grounded. The output end of the rectifier and filter module is connected to the input end of the voltage regulator circuit through the switching control module. The output end of the voltage regulator circuit is grounded through the energy storage capacitor C2. The common connection point between the output end of the voltage regulator circuit and the energy storage capacitor C2 is connected to the working indicator module and the fault indicator module through the switching control module.

[0036] The switching control module detects short-circuit faults in the tested power supply circuit based on the output current of the rectifier and filter module. When the tested power supply circuit is normal, the switching control circuit controls the operation indicator module to work. When the tested power supply circuit is short-circuited, the switching control circuit controls the fault indicator module to work. Through the above structure, it is possible to detect in a timely manner which of the many parallel circuits under the jurisdiction of the air switch has a short-circuit fault after the air switch performs short-circuit protection, and to provide accurate early warning of the short-circuit fault. This allows for timely notification to the user, facilitating subsequent maintenance and avoiding the safety hazards that exist when troubleshooting short-circuit faults in traditional technologies.

[0037] Among them, Figure 2 The induction coil is denoted by LC, and the induction coil is wound on a toroidal iron core, such as... Figure 4 As shown, 1 is the iron core, 2 is the induction coil, and 201 and 202 are two output terminals. One of them is defined as the same-name terminal and the other as the opposite-name terminal. Through the action of the toroidal iron core, the magnetic field can be effectively concentrated and guided, reducing the loss of magnetic flux and thus improving the current utilization rate. The live wire of the circuit under test passes through the toroidal iron core.

[0038] In this embodiment, the switching control module includes a short-circuit detection circuit and a switching control circuit;

[0039] The input terminal of the short-circuit detection circuit is connected to the output terminal of the rectifier filter module, the output terminal of the short-circuit detection circuit is connected to the input terminal of the voltage regulator circuit, the control output terminal of the short-circuit detection circuit is connected to the control input terminal of the switching control circuit, the first power input terminal and the second power input terminal of the switching control circuit are both connected to the common connection point between the output terminal of the voltage regulator circuit and the energy storage capacitor C2, the first power output terminal of the switching control circuit supplies power to the working indicator module, and the second power output terminal of the switching control circuit supplies power to the fault indicator module.

[0040] Specifically: the short-circuit detection circuit includes resistor R1, inductor L1, resistor R3, resistor R4, transistor T3, and resistor R6;

[0041] One end of resistor R1 serves as the input terminal of the short-circuit detection circuit, and the other end of resistor R1 is connected to one end of inductor L1, with the other end of inductor L1 serving as the output terminal of the short-circuit detection circuit.

[0042] One end of resistor R3 is connected to the common connection point between resistor R1 and inductor L1. The other end of resistor R3 is connected to the base of transistor T3. The emitter of transistor T3 is connected to inductor L1 through resistor R4 as one end of the output terminal of the short circuit detection circuit. The collector of transistor T3 is connected to one end of resistor R6. The other end of resistor R6 serves as the control output terminal of the short circuit detection circuit.

[0043] Among them, transistor T3 is a P-type transistor; resistor R1 serves as a voltage reduction and current limiting resistor.

[0044] The switching control circuit includes a transistor T2, a silicon controlled rectifier Q2, and a resistor R8;

[0045] The collector of transistor T2 serves as the first power input terminal of the switching control circuit, the emitter of transistor T2 serves as the first power output terminal of the switching control circuit, and the base of transistor T2 is connected to the output terminal of the rectifier filter circuit through resistor R8;

[0046] The anode of the thyristor Q2 serves as the second power input terminal of the switching control circuit, the cathode of the thyristor Q2 serves as the second power output terminal of the switching control circuit, and the controller of the thyristor Q2 serves as the control output terminal of the switching control circuit.

[0047] The above structure enables accurate switching of indications between normal and fault conditions, thus ensuring the high reliability of the entire early warning system.

[0048] The switching control circuit also includes a Zener diode DW1. The anode of the Zener diode DW1 is grounded, and the cathode of the Zener diode DW1 is connected to the output terminal of the rectifier filter circuit. The Zener diode DW1 can play a good clamping role. Although the stability of the mains power on the market is relatively high, fluctuations are inevitable, thus protecting the transistor T2.

[0049] In this embodiment, the rectifier and filter module includes a rectifier diode D1 and a filter capacitor C1;

[0050] The anode of rectifier diode D1 is connected to the same terminal of the induction coil, and the cathode of rectifier diode D1 is grounded through filter capacitor C1. The common connection point between the cathode of rectifier diode D1 and filter capacitor C1 serves as the output terminal of the rectifier filter module. Filter capacitor C1 is used for AC filtering and also provides continuous current. That is to say, diode rectification is half-wave rectification. When diode D1 is in the positive half-cycle, its cathode has an output. However, when the anode of the diode is in the negative half-cycle of AC, the cathode of the diode has no output and is powered by capacitor C1, thus forming a stable DC current.

[0051] In this embodiment, the switching control circuit further includes a discharge circuit, which includes a thyristor Q1 and a resistor R2. The anode of the thyristor Q1 is connected to the common connection point between the cathode of the rectifier diode D1 and the filter capacitor C1. The cathode of the thyristor Q1 is grounded through the resistor R2. The control electrode of the thyristor Q1 is connected to the control output terminal of the short-circuit detection circuit. As mentioned above, the capacitor C1 can supply power to the subsequent circuit. Therefore, when a short circuit occurs, a timely warning is needed. If the capacitor C1 continues to supply power, it will cause LED2 and LED1 to light up simultaneously, which will cause interference in the accurate warning. Therefore, as mentioned above, the short-circuit detection circuit triggers the thyristor Q1 to conduct, thereby rapidly releasing the charge of the filter capacitor C1. The resistor R2 is a small resistor of no more than 10 ohms, which allows the capacitor C1 to discharge quickly.

[0052] In this embodiment, the voltage regulator circuit includes resistor R5, resistor R6, transistor T1, and Zener diode DW2;

[0053] The collector of transistor T1 serves as the input terminal of the voltage regulator circuit, and the emitter of transistor T1 serves as the output terminal of the voltage regulator circuit. The collector of transistor T1 is connected to the base of transistor T1 through resistor R5. The base of transistor T1 is connected to the cathode of Zener diode DW2, and the anode of Zener diode DW2 is grounded. Through this structure, the DC power output from the rectifier and filter circuit can be regulated, thereby ensuring the stable operation of the indicator light.

[0054] In this embodiment, the working indicator module includes a resistor R7 and an indicator LED2;

[0055] One end of resistor R7 serves as the input terminal of the working indicator module, and the other end of resistor R7 is connected to the positive terminal of indicator LED2. The negative terminal of indicator LED2 is grounded. The indicator LED2 is located on the panel of the switch body 4.

[0056] The fault indication module includes a resistor R2, an indicator LED1, and a buzzer SP;

[0057] One end of resistor R2 serves as the input terminal of the fault indication module, and the other end of resistor R2 is connected to the positive terminal of indicator LED1 and the input terminal of buzzer SP, respectively. The negative terminal of indicator LED1 is grounded, and the output terminal of buzzer SP is grounded; indicator LED2 is located on the panel of switch body 4. Figure 3 As shown, for ease of arrangement, indicator lights LED2, LED1, and buzzer SP are all mounted on the panel of the switch body. This invention also applies to sockets; for socket circuits, the indicator lights are mounted on the socket panel (see attached diagram). Figure 4 The following description uses a lighting switch panel as an example (socket panels are not shown). In this description, 4 represents the switch body, 3 represents the buzzer, 5 represents the fault indicator LED1, and 6 represents the working indicator LED2.

[0058] In this embodiment, when the circuit under test is normal, the current induced by the LC coil is processed by the rectifier and filter module, and then regulated by the voltage regulator circuit after passing through resistor R1 and inductor L1. At the same time, the DC power of the rectifier and filter module controls the transistor T2 to conduct. Since neither the thyristor Q1 nor Q2 has a trigger condition, and because the current flowing through L1 is DC, there is no reverse bias voltage between the emitter and base of transistor T1, so it is cut off. Therefore, the fault indication module does not work, and the operation indication module works.

[0059] When a short circuit occurs in the circuit, the live wire current will increase instantaneously. At this time, the induced current in the inductor LC will also increase accordingly. This increased instantaneous large current is processed by the rectifier and filter circuit and then flows into L1. Since the DC current flowing through L1 is stable when the live wire current of the circuit under test is normal, the large instantaneous current flowing into L1 causes a higher induced electromotive force (EMF) to be generated on the right side of inductor L1 (shown in the diagram) due to the current-holding characteristic of the inductor. The current formed by this EMF flows from right to left inside L1, hindering the inductor L1. A large current supplied by the LC circuit flows through L1 on the left side. This induced electromotive force causes the voltage of L1 to be higher on the right and lower on the left. As a result, a reverse bias voltage is formed between the emitter and base of transistor T3, and transistor T3 turns on. This triggers the simultaneous conduction of thyristors Q1 and Q2. When Q1 turns on, it provides a discharge circuit for the large current supplied by the LC circuit and the charge on capacitor C1. This causes transistor T2 to turn off quickly, and the working indicator LED2 turns off. Meanwhile, the fault indicator LED1 is powered by the energy storage capacitor C1 and turns on, and the buzzer SP sounds an alarm.

[0060] Although both the induction coil LC and the inductor L1 have inductive characteristics, the induction coil LC senses the live wire of the circuit being measured, which carries alternating current. The magnetic flux changes, and when the alternating current in the live wire increases, the magnetic flux of the magnetic field it generates also increases, thus the induced current in the induction coil LC will also increase instantaneously. However, L1 carries direct current, and its electromagnetic field is constant. When a large direct current arrives, it will maintain the current.

[0061] It should be noted that LED1 and LED2 use LEDs of different colors. For example, LED2 lights up green, while LED1 lights up red.

[0062] 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 indicative switch, characterized by: The switch body and an indicating unit are included, the indicating unit includes an induction coil, a rectification filter module, a voltage stabilizing circuit, a working indicating module, an energy storage capacitor C2, a fault indicating module and a switching control module; The induction coil is arranged on the live wire of the switch, the same name end of the induction coil is connected to the input end of the rectification filter module, the other end of the induction coil is grounded, the output end of the rectification filter module is connected to the input end of the voltage stabilizing circuit through the switching control module, the output end of the voltage stabilizing circuit is grounded through the energy storage capacitor C2, and the common connection point between the output end of the voltage stabilizing circuit and the energy storage capacitor C2 is connected to the working indicating module and the fault indicating module through the switching control module; The switching control module detects the short circuit fault of the measured power supply circuit according to the output current of the rectification filter module, and controls the working indicating module to work when the measured power supply circuit is normal, and controls the fault indicating module to work when the measured power supply circuit is short-circuited.

2. The indicating switch of claim 1 wherein: The switching control module includes a short circuit detection circuit and a switching control circuit; The input end of the short circuit detection circuit is connected to the output end of the rectification filter module, the output end of the short circuit detection circuit is connected to the input end of the voltage stabilizing circuit, the control output end of the short circuit detection circuit is connected to the control input end of the switching control circuit, the first power input end and the second power input end of the switching control circuit are both connected to the common connection point between the output end of the voltage stabilizing circuit and the energy storage capacitor C2, the first power output end of the switching control circuit supplies power to the working indicating module, and the second power output end of the switching control circuit supplies power to the fault indicating module.

3. The indicating switch of claim 2 wherein: The short circuit detection circuit includes a resistor R1, an inductor L1, a resistor R3, a resistor R4, a triode T3 and a resistor R6; One end of the resistor R1 serves as the input end of the short circuit detection circuit, the other end of the resistor R1 is connected to one end of the inductor L1, and the other end of the inductor L1 serves as the output end of the short circuit detection circuit; One end of the resistor R3 is connected to the common connection point between the resistor R1 and the inductor L1, the other end of the resistor R3 is connected to the base of the triode T3, the emitter of the triode T3 is connected to one end of the inductor L1 through the resistor R4, the collector of the triode T3 is connected to one end of the resistor R6, and the other end of the resistor R6 serves as the control output end of the short circuit detection circuit; The triode T3 is a P-type triode.

4. The indicating switch of claim 2 wherein: The switching control circuit includes a triode T2, a thyristor Q2 and a resistor R8; The collector of the triode T2 serves as the first power input end of the switching control circuit, the emitter of the triode T2 serves as the first power output end of the switching control circuit, and the base of the triode T2 is connected to the output end of the rectification filter circuit through the resistor R8; The anode of the thyristor Q2 serves as the second power input end of the switching control circuit, the cathode of the thyristor Q2 serves as the second power output end of the switching control circuit, and the control electrode of the thyristor Q2 serves as the control output end of the switching control circuit.

5. The indicating switch of claim 2 wherein: The rectification filter module includes a rectification diode D1 and a filter capacitor C1; Anode of rectifier diode D1 is connected to the same end of inductive coil, cathode of rectifier diode D1 is connected to ground through filter capacitor C1, and the common connection point between cathode of rectifier diode D1 and filter capacitor C1 is the output end of rectification and filtering module.

6. The indicating switch of claim 5 wherein: The switching control circuit further comprises a bleeder circuit, the bleeder circuit comprises a thyristor Q1 and a resistor R2, anode of the thyristor Q1 is connected to the common connection point between cathode of rectifier diode D1 and filter capacitor C1, cathode of the thyristor Q1 is connected to ground through the resistor R2, and control electrode of the thyristor Q1 is connected to the control output end of the short circuit detection circuit.

7. The indicating switch of claim 1 wherein: The voltage stabilizing circuit comprises a resistor R5, a resistor R6, a triode T1 and a voltage stabilizing tube DW2. The collector of the triode T1 is the input end of the voltage stabilizing circuit, the emitter of the triode T1 is the output end of the voltage stabilizing circuit, the collector of the triode T1 is connected to the base of the triode T1 through the resistor R5, the base of the triode T1 is connected to the cathode of the voltage stabilizing tube DW2, and the anode of the voltage stabilizing tube DW2 is connected to ground.

8. The indicating switch of claim 1 wherein: The working indication module comprises a resistor R7 and an indication lamp LED2. One end of the resistor R7 is the input end of the working indication module, the other end of the resistor R7 is connected to the positive electrode of the indication lamp LED2, the negative electrode of the indication lamp LED2 is connected to ground, and the indication lamp LED2 is arranged on the panel of the switch body.

9. The indicating switch of claim 1 wherein: The fault indication module comprises a resistor R2, an indication lamp LED1 and a buzzer SP. One end of the resistor R2 is the input end of the fault indication module, the other end of the resistor R2 is connected to the positive electrode of the indication lamp LED1 and the input end of the buzzer SP respectively, the negative electrode of the indication lamp LED1 is connected to ground, the output end of the buzzer SP is connected to ground, and the indication lamp LED1 is arranged on the panel of the switch body.

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