CN102931632B - Current leakage protection circuit with working status display and real-time fault display functions - Google Patents

Abstract

The invention provides a leakage protection circuit with the functions of working state display and instant fault display, which includes a combination switch. The combination switch makes the tripping coil form a simulated leakage current generation circuit crossing through the double induction coil at the moment when the reset button is pressed. The moving contact end of the combination switch is in contact with another conductive contact end when the reset button drives the main circuit switch to close and reset successfully, and is used as a tripping coil path switch so that the tripping coil forms a detection circuit that does not cross and pass through the double induction coil; there is also a double-color The display diode, the fault indicator light is connected in parallel with the trip coil, and lights up when the trip coil is open; the working status indicator lights up when the reset is successful through the trip coil access switch. The beneficial effects of the present invention: through the combination of the combination switch and the two-color display diode, the working status is displayed immediately during the working process after the reset is successful and timely reminded when a fault occurs, which is safe and convenient to use; the circuit setting is reasonable, effectively reducing the temperature rise and preventing fire.

Description

Leakage protection circuit with working status display and instant fault display function

technical field

The invention relates to a leakage protection circuit installed in a leakage protection socket with the functions of working state display and instant fault display.

Background technique

With the improvement of electricity safety requirements, leakage protection sockets need to have functions such as leakage protection, reverse wiring protection, mechanical tripping at the end of life, and status indication when reset is successful. The existing leakage protection circuits usually do not have instant Fault display function, that is, in the normal use process after a successful reset, the circuit cannot be displayed immediately when there is a sudden component failure. Usually, the control chip, silicon controlled rectifier, tripping coil and other components in the leakage protection circuit have the highest probability of the tripping coil being blown out in various faults because the tripping coil can only withstand short-term large currents. Damage to the silicon controlled rectifier will often cause the tripping coil to blow out. Therefore, the real-time fault display function can basically be completed by monitoring whether the tripping coil is kept in normal conduction through the display circuit. Some of the existing leakage protection circuits also have the function of displaying working status. For example, the utility model patent No. 201020287432.2 discloses a leakage detection protection circuit, which includes an induction coil for detecting leakage current, and a low-resistance fault detection circuit. Self-excited coil, control chip, tripping coil with built-in iron core, thyristor, main circuit switch linked with reset button, etc.; the leakage detection and protection circuit also includes a display circuit, which consists of two-color light-emitting diodes, Composed of a diode and a current-limiting resistor; after the reset button is reset, only one of the two-color light-emitting diodes is on; after the reset button is tripped, both of the two-color light-emitting diodes are on; when the leakage detection protection When the circuit wiring is correct, the LEDs of the two colors of the two-color LEDs are all bright, and on the contrary, when the wiring of the leakage detection protection circuit is wrong, the LEDs of the two colors in the two-color LEDs are not bright.

Due to the limitation of the shape and structure of mechanical components in the existing leakage protection circuit, there are too many components on the circuit board and the gap between them is small, so it is easy to discharge between the solder joints of electronic components without passing through the discharge sheet In the event of damage to the circuit board, each metal sheet is small in size, slow in heat dissipation, and the temperature rises, and the device is easily strained. The utility model patent with the patent No. 201020287432.2 also has the above situation. Therefore, it is an urgent problem to be solved for the leakage protection circuit to prevent the components from igniting and to display the fault in time during use.

Contents of the invention

Aiming at the above-mentioned problems in the prior art, the present invention provides a leakage protection circuit with the functions of working state display and instant fault display.

In order to realize the above-mentioned purpose of the invention, the present invention adopts the following technical solutions:

Leakage protection circuit with working status display and instant fault display function, including power input terminal, power output terminal, load terminal, double induction coil L1, L2 for detecting leakage current and low resistance fault, control chip IC1, built-in iron The tripping coil S0L of the core, the thyristor V4 and the main circuit switch (KR2-1, KR2-2) linked with the reset button are characterized in that: it also includes a combination switch KR-2 linked with the reset button, the combination switch When the reset button is pressed, the moving contact end contacts with the second conductive contact end 37A as an analog leakage current generating switch, so that the tripping coil SOL forms an analog leakage current generating circuit crossing through the double induction coils, and the moving contact end of the combined switch is in the The reset button drives the main circuit switch to close and when the reset is successful, it contacts with the conductive contact terminal 35B as the tripping coil access switch so that the tripping coil SOL forms a detection circuit that does not cross and pass through the double induction coils; there are also two-color display diodes LED1-R, LED1 -G, the fault indicator LED1-R in the two-color display diode is connected in parallel with the trip coil, and lights up when the trip coil is open; the working status indicator LED1-G in the two-color display diode is successfully reset through the trip coil access switch lights up. the

Further, the moving contact end of the combination switch is connected to one of the output ends of the power supply, the combination switch has a pair of conductive contact ends that are in contact with the moving contact end at the moment when the reset button is pressed, and the first conductive contact end is connected to the same phase The moving contact end of the main circuit switch located at the moving contact end of the combination switch is in contact with the main circuit switch when the main circuit switch is not closed; the second conductive contact end of the combination switch is connected to one of the moving contact ends of the combination switch with a different phase from the input end of the power supply through a current-limiting resistor. Connected to each other, at the moment when the reset button is pressed at the movable contact end of the combination switch, an end-of-life detection circuit crossing through the double induction coil is formed, and the conductive contact end is connected to the thyristor cathode through the I-III diode V1c; The cathode of the power supply input terminal is connected to a phase of the power input terminal that is located at the movable contact end of the combination switch, and the input terminal of the trip coil is connected to a phase of the same phase located at the movable contact end of the combination switch, forming a tripping coil path that does not cross the double induction coil . the

Further, the second conductive contact end 37A used to form the analog leakage current generation switch in the combined switch and a third conductive contact end suspended under one of the moving contact ends of the main circuit switch (KR2-1, KR2-2) The contact terminal 37B is connected, and the second conductive contact terminal 37A of the combination switch is connected to the third conductive contact terminal 37B, one of the movable contact terminals of the main circuit switch (KR2-1, KR2-2) under the state of the main circuit switch disconnecting the switch. Connect to the corresponding power input.

Further, it also includes a test button and a test switch linked with the test button, one end of the test switch is movably connected to one of the power input ends, and the other end is connected to the power output ends of different phases through a current limiting resistor, the power input end and the power supply The output terminal forms a test loop for simulating leakage current through a test switch and a current-limiting resistor.

Preferably, the input end of the tripping coil is connected to the fire wire end of the power supply input end, the output end of the tripping coil is connected to the power supply end of the control chip IC1 through the current limiting resistor R1, the first I-III diode V1a, and the grounding of the control chip end is connected to the moving contact end 36C of the combined switch through the fifth diode V5, and the ground end of the control chip is also connected to the third-II diode V3-II which is opposite to the fifth diode V5 and the first lead-in power supply end of the control chip. The anode of the I-I diode V1a is connected, and the moving contact end 36C of the combination switch is connected with the power supply end of the control chip through the I-II diode V1b; the common cathode of the fault indicator LED1-R and the working status indicator LED1-G is connected to the tripping coil The output terminals are connected to form a state where the contacts overlap up and down.

Preferably, the moving contact end 36C of the combination switch is connected to the input end of the tripping coil, the first conductive contact end 35B of the combination switch is connected to the live line end of the power input end, and the second conductive contact end 37A of the combination switch is connected through a floating The third conductive contact terminal 37B below the live wire switch KR2-1 of the main circuit switch is connected to the live wire end of the power input terminal passing through the double induction coil; the cathode of the thyristor is connected to the neutral wire end of the power input end through a diode; fault indication The anode of the lamp LED1-R is connected to the cathode of the third diode V3 through the sixth resistor R6, the anode of the third diode V3 is connected to the moving contact end of the combination switch and the input end of the tripping coil, and the fault indicator LED1-R The cathode is connected to the output terminal of the tripping coil and the anode of the thyristor, the anode of the working status indicator LED1-G is connected to the cathode of the second diode V2 through the fifth resistor R5, and the anode of the second diode V2 is connected to the cathode of the second diode V2. The zero line terminal of the power input terminal is connected, the cathode of the working status indicator LED1-G is connected with the power supply terminal of the control chip; the output terminal of the power supply and the input terminal are respectively connected with a pair of conductive contact terminals, and the main circuit switch KR2-1, KR2- 2 When it is closed, it is in contact with the moving contact end of the main circuit switch, forming a state of overlapping up and down.

Preferably, the moving contact end 36C of the combined switch is connected to the input end of the tripping coil, the first conductive contact end 35B of the combined switch is connected to the live line end of the power input end, and the second conductive contact end 37A of the combined switch is connected through a floating The third conductive contact terminal 37B below the neutral switch KR2-1 of the main circuit switch is connected to the live wire end of the power input terminal passing through the double induction coil; the cathode of the thyristor is connected to the ground terminal of the control chip; the fault indicator LED1- The anode of R is connected to the cathode of the third diode V3 through the sixth resistor R6, the anode of the third diode V3 is connected to the moving contact terminal 36C of the combined switch, the cathode of the fault indicator LED1-R is connected to the output terminal of the tripping coil and The anode of the thyristor is connected, the anode of the working status indicator LED1-G is connected to the cathode of the second diode V2 through the fifth resistor R5, and the anode of the second diode V2 is connected to the zero line terminal of the power input terminal, and the working The status indicator LED1-G is connected to the common cathode of the fault indicator LED1-R, and the cathode is connected to the output terminal of the tripping coil; the output terminal of the power supply and the load terminal are each provided with a pair of conductive contacts, which are connected to the main circuit when the main circuit switch is closed. The moving contact end of the switch is in contact with conduction, forming a state of overlapping up and down.

Preferably, the moving contact end 36C of the combination switch is connected to the input end of the tripping coil, the first conductive contact end 35B of the combination switch is connected to the power input end through the live wire end of the double induction coil, and the second conductive contact end 35B of the combination switch is connected to the live wire end of the double induction coil. The contact end 37A is connected to the live wire end of the power input end; the cathode of the silicon controlled rectifier is connected to the ground end of the control chip and is connected to the neutral wire end of the power input end passing through the double induction coil through a diode; the anode of the fault indicator LED1-R passes through the first The six resistors R6 are connected to the cathode of the third diode V3, the anode of the third diode V3 is connected to the moving contact end of the combination switch and the input end of the tripping coil, and the cathode of the fault indicator LED1-R is connected to the output of the tripping coil terminal and the anode of the thyristor, the anode of the working status indicator LED1-G is connected to the cathode of the second diode V2 through the fifth resistor R5, and the anode of the second diode V2 is connected to the input terminal of the power supply through the double induction The zero line end of the coil is connected, and the cathode of the working status indicator LED1-G is connected to the power end of the control chip; the power output end and the load end are respectively provided with a pair of conductive contact ends, and the main circuit switch has two pairs respectively connected to the power output end The moving contact end corresponding to the load end is in contact with the output end of the power supply and the load end respectively when closed.

Preferably, the moving contact terminal 36C of the combination switch is connected to the cathode of the thyristor through a diode, the first conductive contact terminal 35B of the combination switch is connected to the power input terminal through the zero line end of the double induction coil, and the first conductive contact terminal 35B of the combination switch is connected to the zero line end of the double induction coil. The two conductive contact terminals 37A are connected to the neutral terminal of the power supply input terminal; the cathode of the thyristor is connected to the ground terminal of the control chip and connected to the moving contact terminal 36C of the combination switch through a diode; the anode of the fault indicator LED1-R is connected to the sixth resistor R6 is connected to the cathode of the third diode V3, the anode of the third diode V3 is connected to the live wire end of the power input terminal passing through the double induction coil and the input terminal of the tripping coil, and the cathode of the fault indicator LED1-R is connected to the tripping coil The output terminal of the coil is connected to the anode of the thyristor, the anode of the working state indicator LED1-G is connected to the cathode of the second diode V2 through the fifth resistor R5, and the anode of the second diode V2 is connected to the dynamic combination switch. The contact terminal 36C is connected, and the cathode of the working status indicator LED1-G is finally connected to the power supply terminal of the control chip; the load terminal is drawn out from the corresponding terminal of the power supply output terminal.

Further, the leakage protection circuit with instant fault display function also includes a timer DSQ for timing detection circuit functional integrity, the power supply terminal Vcc of the timer DSQ is connected with the output terminal of the tripping coil, and the output terminal of the timer DSQ OUT is connected to the gate of the thyristor V4, and the ground terminal of the timer DSQ is connected to the ground terminal of the control chip and the cathode of the thyristor.

Further, a pair of gap-fit metal discharge sheets are provided on the moving contact ends of the main circuit switches (KR2-1, KR2-2), and the front ends of the metal discharge sheets have discharge arc surfaces or discharge tips. The switch plate of the main circuit and the metal discharge plate form a two-in-one state.

Furthermore, one end 35B of the conductive contact end of the combination switch is suspended above the movable contact end 36C, the other end is connected to the power input end, and the middle part has a discharge part 35A which is gap-fitted with another power input end to form a set of discharge conductors.

Further, the first conductive contact end 35B of the combination switch leads to a terminal with a discharge portion 35A, which is connected to one of the power input ends; the test button is linked with a static contact conductor, and one end 25B of the static contact conductor is connected to the combination The terminals drawn from the conductive contact end of the switch can be actively contacted and conducted.

Compared with the prior art, the beneficial effect of the present invention is that: through the combination of the combined switch and the two-color display diode, the working status is displayed immediately during the working process after the reset is successful, and it is reminded in time when a fault occurs, which is safe and convenient to use; the circuit setting Reasonable, effectively reduce the temperature rise and prevent sparking; set the timer to regularly detect the functional integrity of the circuit, and the main circuit switch is equipped with a metal discharge sheet, which can directly dissipate heat and cool down, and can prevent high-voltage impact discharge, reducing the number of molds and assembly processes. Further improve security.

Description of drawings

Fig. 1 is the circuit diagram of embodiment one of the present invention;

Fig. 2 is the circuit diagram of the second embodiment of the present invention;

Fig. 3 is the circuit diagram of the third embodiment of the present invention;

Fig. 4 is the circuit diagram of embodiment four of the present invention;

Fig. 5 is the circuit diagram of Embodiment 5 of the present invention;

FIG. 6 is a circuit diagram of Embodiment 6 of the present invention.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the present invention will be described in further detail:

Implementation one

Referring to Figure 1, the leakage protection circuit with instant fault display function includes power input terminal, power output terminal, load terminal, double induction coils (L1, L2) for detecting leakage current and low resistance fault, and control chip IC1 , a built-in tripping coil S0L with an iron core, a silicon controlled rectifier V4, and a main circuit switch (KR2-1, KR2-2) linked with the reset button, and a combined switch KR-2 linked with the reset button. When the reset button is pressed, the moving contact end contacts with one of the conductive contact ends as an analog leakage current generation switch, so that the tripping coil SOL forms an analog leakage current generation circuit that crosses through the double induction coils, and the moving contact end of the combined switch is reset. The button drives the main circuit switch to close and reset successfully, and contacts with another conductive contact end as the tripping coil access switch so that the tripping coil SOL forms a detection circuit that does not cross and pass through the double induction coil; there are also two-color display diodes (LED1-R, LED1-G), the fault indicator LED1-R in the two-color display diode is connected in parallel with the trip coil, and lights up when the trip coil is open; the working status indicator LED1-G in the two-color display diode passes through the trip coil access switch. Lights up when the reset is successful. The connection methods of the trip coil, thyristor, control chip and double induction coils have been described in detail in patent documents such as patent No. 201020287432.2, and will not be repeated here.

In this embodiment, the movable contact terminal 36C of the combined switch is connected to the cathode of the thyristor V4 through the first I-III diode V1c, and one of the conductive contact terminals 35B of the combined switch is connected to one of the power supply input terminals, and the movable contact terminal 36C is reset. After the button drives the main circuit switch (KR2-1, KR2-2) to close, it remains in contact with the first conductive contact end 35B as a tripping coil path switch; , L2 and the same phase is connected to the power input terminal located at the first conductive contact end 35B, and the movable contact end 36C is in contact with the second conductive contact end 37A when the reset button is pressed, and conducts as an analog leakage current generation switch; the anode of the thyristor V4 passes through The tripping coil L3 is connected to another power input terminal of a different phase; the anode of the fault indicator LED1-R in the two-color display diode is connected to the input terminal of the tripping coil L3 through the sixth resistor R6 and the third diode V3, and the fault The cathode of the indicator light LED1-R is connected to the tripping coil output terminal, the anode of the working status indicator LED1-G is connected to the moving contact terminal 36C of the combination switch through the fifth resistor R5 and the second diode V2, and the working status indicator LED The cathode of LED1-G is connected to the output end of the tripping coil or the power end of the control chip IC1. the

In order to prevent the occurrence of sparking due to the small gap between components, the second conductive contact end 37A used to form the analog leakage current generating switch in the combination switch is in dynamic contact with a floating switch (KR2-1, KR2-2) in the main circuit. The third conductive contact end 37B below one of the ends is connected, and the second conductive contact end 37A of the combined switch passes through the third conductive contact end 37B, the main circuit switch (KR2-1, KR2-2 ) One of the moving contact terminals is connected to the corresponding power input terminal.

In order to facilitate end-of-life detection, the leakage protection circuit with instant fault display function also includes a test button TEST and a test switch KR-5 linked with the test button. In Figure 1, the neutral terminal WHITE is connected, which can be fixed or movable. In this example, a movable connection is used, and the other end is connected to the hot wire terminal HOT of the power output terminal of different phases through a current limiting resistor H2. The power input terminal and the power supply The output terminal forms a test loop for simulating leakage current through a test switch and a current-limiting resistor.

The fault indicator LED1-R in the two-color display diode is usually displayed in red, and the working status indicator LED1-G is usually displayed in green. On, because the trip coil is not open, the voltage loaded on the trip coil is too small to light up the fault indicator LED1-R, when the trip coil is blown during use, the fault indicator LED1-R It will be on immediately, and the working status indicator LED1-G will be off at the same time, reminding the user to replace the leakage protection socket. In this embodiment, in addition to detecting whether the tripping coil is blown, the circuit in this embodiment can also make a corresponding display for the extreme situation that the tripping coil is not damaged but the control chip is damaged. The impedance between the 4 pins increases, and the working status indicator LED1-G cannot be lit, which also indicates that the circuit is faulty.

The combined switch movable contact end 36C is connected to the power supply terminal of the control chip through the I-III diode V1c connected in reverse, the I-IV diode V1d connected in the forward direction, and the I-I diode V1a connected in the forward direction. When the reset button moves upwards, it drives the main circuit switches KR2-1, KR2-2 and contacts with the power output terminal and the load terminal, and the switches KR-3-1 and KR-3-2 are closed. The load terminal has a power output working status indicator light light up.

In order to optimize the spatial structure in the socket, one end 35B of the conductive contact end of the combined switch is suspended above the movable contact end 36C, the other end is connected to the power input end, and the middle part has a discharge part that cooperates with another power input end to form a set of discharge conductors. 35A. The first conductive contact end 35B of the combination switch leads to a terminal with a discharge part 35A, which is connected to one of the power input ends; the test button is linked with a static contact conductor, and one end 25B of the static contact conductor is connected to the terminal drawn from the conductive contact end of the combination switch. Movable contact conduction.

It also includes a test button to force the lock to move through the mechanical structure when the fault indicator LED1-R is on, so that the lock hole and the reset guide column are separated to trip and then cut off the power supply connection of the input terminal and the output terminal. When the working state is being reset, the fault display light LED1-R should light up to prove that the leakage protection circuit has expired. Press the test button to force the lock to move so that the lock hole and the reset guide groove are separated in a straight line to trip, and the connection between the input end and the output end is cut off. Power connection, then pressing the reset button will automatically prevent reset.

When the working state is being reset, the working state indicator light should be off, which proves that the leakage protection circuit integrated block is damaged and has reached the end of its life. Press the test button to force the lock to move so that the lock hole is separated from the reset guide groove in a straight line. The tripping moving contact drops and cuts off The power input terminal is connected to the power supply at the output terminal, and then pressing the reset button will automatically prevent the reset.

Embodiment two

With reference to Fig. 2, the difference between the present embodiment and the first embodiment is that the input end of the tripping coil SOL is connected to the live wire end of the power supply input end, and the output end of the tripping coil is connected to the control circuit through the current-limiting resistor R1 and the first I-I diode V1a. The power supply terminal of the chip IC1 is connected, the ground terminal of the control chip is connected with the movable contact terminal 36C of the combined switch through the fifth diode V5, and the ground terminal of the control chip is also connected through the third -II which is opposite to the fifth diode V5. Diode V3-II is connected to the anode of the first I-I diode V1a introduced into the power supply terminal of the control chip, and the moving contact terminal 36C of the combined switch is connected to the power supply terminal of the control chip through the first I-II diode V1b; the fault indicator LED1-R and the working status indication The common cathode of the lamp LED1-G is connected to the output terminal of the trip coil. In this embodiment, the fault indicator LED1-R and the working status indicator LED1-G in the two-color display diode are connected with a common cathode, and the circuit structure is more concise and the space is saved.

Embodiment three

Referring to Fig. 3, the difference between this embodiment and Embodiment 1 is that the movable contact end 36C of the combination switch is connected to the input end of the tripping coil, the first conductive contact end 35B of the combination switch is connected to the live wire end of the power input end, The second conductive contact end 37A of the combined switch is connected to the live wire end of the power supply input terminal passing through the double induction coil through a third conductive contact end 37B suspended below the live wire switch KR2-1 of the main circuit switch; The diode is connected to the neutral terminal of the power input terminal; the anode of the fault indicator LED1-R is connected to the cathode of the third diode V3 through the sixth resistor R6, and the anode of the third diode V3 is connected to the moving contact terminal of the combination switch and the tripping coil The input terminal of the fault indicator LED1-R is connected with the output terminal of the tripping coil and the anode of the thyristor, and the anode of the working status indicator LED1-G is connected with the second diode V2 through the fifth resistor R5. The cathode is connected, the anode of the second diode V2 is connected to the zero line terminal of the power supply input terminal, the cathode of the working status indicator LED1-G is connected to the power supply terminal of the control chip; a pair of conductive contact terminals are respectively provided at the power supply output terminal and the input terminal , the two pairs of conductive contact terminals conduct with each other, and both contact and conduct with the moving contact terminal of the main circuit switch when the main circuit switch is closed. It constitutes the overlapping state of contacts up and down.

Embodiment four

Referring to Fig. 4, the difference between this embodiment and Embodiment 1 is that the moving contact end 36C of the combined switch is connected to the input end of the tripping coil, the first conductive contact end 35B of the combined switch is connected to the live wire end of the power input end, and the combined switch The second conductive contact end 37A of the switch is connected to the live wire end of the power supply input terminal passing through the double induction coil through a third conductive contact end 37B suspended below the neutral switch KR2-1 of the main circuit switch; the cathode of the thyristor is connected to the The ground terminal of the control chip is connected; the anode of the fault indicator LED1-R is connected to the cathode of the third diode V3 through the sixth resistor R6, and the anode of the third diode V3 is connected to the moving contact terminal 36C of the combination switch. The fault indicator LED1-R The cathode of -R is connected to the output terminal of the tripping coil and the anode of the thyristor, the anode of the working status indicator LED1-G is connected to the cathode of the second diode V2 through the fifth resistor R5, and the second diode V2 The anode of the anode is connected to the zero line terminal of the power input terminal, the working status indicator LED1-G is connected to the common cathode of the fault indicator LED1-R, and the cathode is connected to the output terminal of the tripping coil; the output terminal of the power supply and the load terminal are each provided with a pair of conductive contacts When the main circuit switch is closed, they are in contact with the moving contact end of the main circuit switch. It constitutes the overlapping state of contacts up and down.

Embodiment five

Referring to Fig. 5, the difference between this embodiment and Embodiment 1 is that the moving contact end 36C of the combination switch is connected to the input end of the tripping coil, and the first conductive contact end 35B of the combination switch and the input end of the power supply pass through the double induction The live wire end of the coil is connected, and the second conductive contact end 37A of the combination switch is connected with the live wire end of the power input end; the cathode of the thyristor is connected with the ground end of the control chip and passes through a diode and the power input end through the neutral wire of the double induction coil The anode of the fault indicator LED1-R is connected to the cathode of the third diode V3 through the sixth resistor R6, and the anode of the third diode V3 is connected to the moving contact end of the combination switch and the input end of the trip coil, and the fault indication The cathode of the lamp LED1-R is connected with the output terminal of the tripping coil and the anode of the thyristor, the anode of the working state indicator LED1-G is connected with the cathode of the second diode V2 through the fifth resistor R5, and the second diode V2 The anode of the tube V2 is connected to the power supply input terminal through the zero line terminal of the double induction coil, and the cathode of the working status indicator LED1-G is connected to the power supply terminal of the control chip; the power supply output terminal and the load terminal are respectively provided with a pair of conductive contacts. The switch in the main circuit has two pairs of moving contact ends corresponding to the output end of the power supply and the load end respectively, and is respectively in contact with the output end of the power supply and the load end when it is closed.

Embodiment six

Referring to Fig. 6, the difference between this embodiment and Embodiment 1 is that the movable contact end 36C of the combination switch is connected to the cathode of the silicon controlled rectifier through the first I-III diode V1c, and the first conductive contact end 35B of the combination switch is connected to the power supply The input end is connected to the zero line end of the double induction coil, and the second conductive contact end 37A of the combination switch is connected to the zero line end of the power supply input end; the cathode of the thyristor is connected to the ground end of the control chip and connected to the combination switch through a diode The moving contact terminal 36C is connected; the anode of the fault indicator LED1-R is connected to the cathode of the third diode V3 through the sixth resistor R6, and the anode of the third diode V3 is connected to the input terminal of the power supply through the live terminal of the double induction coil and tripping The input terminal of the coil is connected, the cathode of the fault indicator LED1-R is connected with the output terminal of the tripping coil and the anode of the thyristor, the anode of the working status indicator LED1-G is connected with the second diode V2 through the fifth resistor R5 The cathode of the second diode V2 is connected to the moving contact terminal 36C of the combination switch, the cathode of the working status indicator LED1-G is connected to the power supply terminal of the control chip; the load terminal is drawn from the corresponding terminal of the power supply output terminal.

In order to save energy and reduce consumption, the leakage protection circuit with instant fault display function also includes a timer DSQ for regularly detecting the functional integrity of the circuit. The power supply terminal Vcc of the timer DSQ is connected with the output terminal of the tripping coil, and the The output terminal OUT is connected to the gate of the thyristor V4, and the ground terminal of the timer DSQ is connected to the ground terminal of the control chip. The timer DSQ regularly sends a conduction signal to the gate of the thyristor. If the circuit function is intact, the main circuit switch trips, and the leakage protection circuit is in a power-saving state. If the life has expired, it will not trip normally, prompting the user to replace a new leakage protection circuit Protect the socket.

In order to prevent damage to the circuit caused by instantaneous high voltage, a pair of metal discharge sheets with gap fit are arranged on the moving contact end of the main circuit switch (KR2-1, KR2-2), and the front end of the metal discharge sheet has a discharge arc surface or a discharge tip. The switch plate of the main circuit and the metal discharge plate form a two-in-one state. The settings of the timer DSQ and the discharge sheet are also applicable to the foregoing embodiments.

Although the present invention has been illustrated and described with reference to preferred embodiments, those skilled in the art will understand that it is not limited to the description of the above embodiments, and that forms and details may be made within the scope of the claims. of various changes.

Claims (15)

1. there is the leakage protection circuit of operating state display and instant malfunction coefficient function, comprise power input, power output end, load end, for detecting two induction coil (L1 of leakage current and low resistance fault, L2), control chip (IC1), be built-in with the tripping coil (S0L) of iron core, controllable silicon (V4) and the major loop switch (KR2-1 linked with reset button, KR2-2), it is characterized in that: also comprise a unit switch (KR-2) linked with reset button, the dynamic contact jaw of unit switch is pressed moment in reset button and contact with the second conductive contact end (37A) and produce switch tripping coil (SOL) is formed cross through the simulation leakage current of pair induction coil to produce loop as simulating leakage current, the dynamic contact jaw of unit switch contacts measure loop tripping coil (SOL) being formed do not cross through pair induction coil as tripping coil channel selector with the first conductive contact end (35B) when reset button drives the success of major loop switch closed reduction, also be provided with double-colored display diode (LED1-R, LED1-G), the malfunction indicator lamp (LED1-R) in double-colored display diode is in parallel with tripping coil, lights when tripping coil is opened a way, working station indicator (LED1-G) in double-colored display diode is bright at the successful time point of reset through tripping coil channel selector, the dynamic contact jaw (36C) of described unit switch is connected with controllable silicon (V4) negative electrode through I-III diode (V1c), first conductive contact end (35B) of unit switch is connected with one of power input, and dynamic contact jaw (36C) keeps contacting conducting as tripping coil channel selector with the first conductive contact end (35B) after reset button drives major loop switch (KR2-1, KR2-2) closed, second conductive contact end (37A) of unit switch with through two induction coil (L1, L2) and the power input that homophase is positioned at the first conductive contact end (35B) be connected, dynamic contact jaw (36C) presses instantaneously in reset button that contacting conducting with the second conductive contact end (37A) produces switch as simulating leakage current, controllable silicon (V4) anode is connected with the power input of another out of phase through tripping coil (L3), the anode of the malfunction indicator lamp (LED1-R) in double-colored display diode is connected with tripping coil (L3) input by the 6th resistance (R6), the 3rd diode (V3), the negative electrode of malfunction indicator lamp (LED1-R) is connected with tripping coil output, the anode of working station indicator (LED1-G) is connected with the dynamic contact jaw (36C) of unit switch by the 5th resistance (R5), the second diode (V2), and the negative electrode of working station indicator (LED1-G) is connected to the power end of tripping coil output or control chip (IC1).

2. the leakage protection circuit with operating state display and instant malfunction coefficient function according to claim 1, it is characterized in that: the second conductive contact end (37A) and producing switch in described unit switch for forming simulation leakage current is suspended in major loop switch (KR2-1, 3rd conductive contact end (37B) of one of dynamic contact jaw KR2-2) below is connected, second conductive contact end (37A) of unit switch passes through the 3rd conductive contact end (37B) under major loop switch cut-off switch state, major loop switch (KR2-1, KR2-2) one of dynamic contact jaw is connected with corresponding power input.

3. the leakage protection circuit with operating state display and instant malfunction coefficient function according to claim 1; it is characterized in that: the Test Switchboard also comprising a testing button and link with testing button; one of Test Switchboard one end and power input are movably connected; the other end is connected with the power output end of out of phase by a current-limiting resistance, and power input and power output end form by Test Switchboard and current-limiting resistance the test loop producing simulation leakage current.

4. the leakage protection circuit with operating state display and instant malfunction coefficient function according to claim 1, it is characterized in that: the input of described tripping coil is connected with the live wire end of power input, the output of tripping coil is by current-limiting resistance (R1), I-I diode (V1a) is connected with the power end of control chip (IC1), the earth terminal of control chip is connected with the dynamic contact jaw (36C) of unit switch by the 5th diode (V5), the earth terminal of control chip is also connected with the anode of the I-I diode (V1a) introducing control chip power end by the 3rd-II diode (V3-II) being in reverse to the 5th diode (V5), the dynamic contact jaw (36C) of unit switch is connected with the power end of control chip by I-II diode (V1b), malfunction indicator lamp (LED1-R) is connected with the output of tripping coil with the common cathode of working station indicator (LED1-G).

5. the leakage protection circuit with operating state display and instant malfunction coefficient function according to claim 1, it is characterized in that: the dynamic contact jaw (36C) of described unit switch is connected with the input of tripping coil, first conductive contact end (35B) of unit switch is connected with the live wire end of power input, and the second conductive contact end (37A) of unit switch is connected with the live wire end of power input through two induction coil by the 3rd conductive contact end (37B) that is suspended in live wire switch (KR2-1) below of major loop switch, silicon controlled negative electrode is connected with the zero line side of power input through diode, malfunction indicator lamp (LED1-R) anode is connected with the 3rd diode (V3) negative electrode by the 6th resistance (R6), 3rd diode (V3) anode is connected with the dynamic contact jaw of unit switch and the input of tripping coil, the negative electrode of malfunction indicator lamp (LED1-R) is connected with the output of tripping coil and silicon controlled anode, the anode of working station indicator (LED1-G) is connected with the negative electrode of the second diode (V2) by the 5th resistance (R5), the anode of the second diode (V2) is connected with the zero line side of power input, the negative electrode of working station indicator (LED1-G) is connected with the power end of control chip, power output end is provided with pair of conductive contact jaw with input each being connected, and all contacts conducting with the dynamic contact jaw of major loop switch when major loop switch closes, and forms the upper and lower overlap condition in contact.

6. the leakage protection circuit with operating state display and instant malfunction coefficient function according to claim 1, it is characterized in that: the dynamic contact jaw (36C) of described unit switch is connected with tripping coil input, first conductive contact end (35B) of unit switch is connected with the live wire end of power input, and the second conductive contact end (37A) of unit switch is connected with the live wire end of power input through two induction coil by the 3rd conductive contact end (37B) that is suspended in zero line switch (KR2-1) below of major loop switch, silicon controlled negative electrode is connected with the earth terminal of control chip, malfunction indicator lamp (LED1-R) anode is connected with the 3rd diode (V3) negative electrode by the 6th resistance (R6), 3rd diode (V3) anode is connected with the dynamic contact jaw (36C) of unit switch, the negative electrode of malfunction indicator lamp (LED1-R) is connected with the output of tripping coil and silicon controlled anode, the anode of working station indicator (LED1-G) is connected with the negative electrode of the second diode (V2) by the 5th resistance (R5), the anode of the second diode (V2) is connected with the zero line side of power input, working station indicator (LED1-G) is connected with malfunction indicator lamp (LED1-R) common cathode, negative electrode is connected with tripping coil output, power output end and load end are respectively provided with pair of conductive contact jaw, all contact conducting with the dynamic contact jaw of major loop switch, form upper and lower overlap condition when major loop switch closes.

7. the leakage protection circuit with operating state display and instant malfunction coefficient function according to claim 1, it is characterized in that: the dynamic contact jaw (36C) of described unit switch is connected with the input of tripping coil, first conductive contact end (35B) of unit switch is connected with the live wire end of power input through two induction coil, and the second conductive contact end (37A) of unit switch is connected with the live wire end of power input, silicon controlled negative electrode is connected with control chip earth terminal and is connected with the zero line side of power input through two induction coil by a diode, malfunction indicator lamp (LED1-R) anode is connected with the 3rd diode (V3) negative electrode by the 6th resistance (R6), 3rd diode (V3) anode is connected with the dynamic contact jaw of unit switch and the input of tripping coil, the negative electrode of malfunction indicator lamp (LED1-R) is connected with the output of tripping coil and silicon controlled anode, the anode of working station indicator (LED1-G) is connected with the negative electrode of the second diode (V2) by the 5th resistance (R5), the anode of the second diode (V2) is connected with the zero line side of power input through two induction coil, the negative electrode of working station indicator (LED1-G) is connected with the power end of control chip, power output end and load end are respectively provided with pair of conductive contact jaw, have two to dynamic contact jaw corresponding with power output end and load end respectively, contact conducting respectively time closed with power output end with load end at major loop switch.

8. the leakage protection circuit with operating state display and instant malfunction coefficient function according to claim 7, it is characterized in that: the dynamic contact jaw (36C) of described unit switch is connected with silicon controlled negative electrode through diode, first conductive contact end (35B) of unit switch is connected with the zero line side of power input through two induction coil, and the second conductive contact end (37A) of unit switch is connected with the zero line side of power input, silicon controlled negative electrode is connected with control chip earth terminal and is connected with the dynamic contact jaw (36C) of unit switch by a diode, malfunction indicator lamp (LED1-R) anode is connected with the 3rd diode (V3) negative electrode by the 6th resistance (R6), 3rd diode (V3) anode is connected through two live wire end of induction coil and the input of tripping coil with power input, the negative electrode of malfunction indicator lamp (LED1-R) is connected with the output of tripping coil and silicon controlled anode, the anode of working station indicator (LED1-G) is connected with the negative electrode of the second diode (V2) by the 5th resistance (R5), the anode of the second diode (V2) is connected with the dynamic contact jaw (36C) of unit switch, the negative electrode of working station indicator (LED1-G) is finally connected with the power end of control chip, load end is drawn from power output end respective terminal.

9. the leakage protection circuit with operating state display and instant malfunction coefficient function according to any one of claim 1 to 8; it is characterized in that: also comprise one for the timer (DSQ) of timely checking circuit functional completeness; the power end (Vcc) of timer (DSQ) is connected with tripping coil output; the output (OUT) of timer (DSQ) is connected with the gate pole of controllable silicon (V4); the earth terminal of timer (DSQ) is connected with the earth terminal of control chip, is also connected with controllable silicon negative electrode.

10. the leakage protection circuit with operating state display and instant malfunction coefficient function according to any one of claim 1 to 8; it is characterized in that: the dynamic contact jaw of described major loop switch (KR2-1, KR2-2) is provided with the metal discharge sheet of a pair matched in clearance, the front end of metal discharge sheet has electric discharge cambered surface or discharge tip.

11. according to claim 1ly have operating state display and the leakage protection circuits of instant malfunction coefficient function, it is characterized in that: described unit switch moves contact jaw (36C) through the I-I diode (V1a) of the I-III diode (V1c) of Opposite direction connection, I-IV diode (V1d) that forward connects, forward connection and is connected with the power end of control chip.

12. leakage protection circuits with operating state display and instant malfunction coefficient function according to claim 1; it is characterized in that: drive major loop switch (KR2-1, KR2-2) when described reset button moves up and contact conducting with power output end and load end, the upper and lower overlapping closed load end in contact of switch (KR-3-1, KR-3-2) has power supply output services status indicator lamp to light.

13. leakage protection circuits with operating state display and instant malfunction coefficient function according to claim 1, is characterized in that: be also included in when malfunction indicator lamp (LED1-R) lights and force snap close to move to make lockhole be separated the testing button tripping and then cut off input and be connected with the power supply of output with reset guide post by mechanical structure.

14. leakage protection circuits with operating state display and instant malfunction coefficient function according to claim 1; it is characterized in that: described unit switch conductive contact end one end (35B) is suspended in the top of dynamic contact jaw (36C); the other end is connected with power input, and middle part has the discharge part (35A) forming one group of conductor that discharges with another power input matched in clearance.

15. leakage protection circuits with operating state display and instant malfunction coefficient function according to claim 13, it is characterized in that: described unit switch first conductive contact end (35B) draws the terminal that has discharge part (35A), and this terminal is connected with one of power input; Described testing button is linkedly set with a quiet contact conductor, and the terminal that quiet contact conductor one end (25B) and unit switch conductive contact end are drawn contacts conducting movably.