CN208423767U - A kind of alternating current-direct current leakage current detection protection circuit - Google Patents

Abstract

The utility model discloses a kind of alternating current-direct current leakage current detection protection circuits, belong to protection circuit field.A kind of alternating current-direct current leakage current detection protection circuit; including current protecting circuit, rectification circuit, voltage protection circuit, ghyristor circuit, reduction voltage circuit, filter circuit and leakage current detection circuit; the current protecting circuit includes R6, R12, the R15 for being connected on resistance in three phase mains respectively; varistor RV1 in parallel between described resistance R6, R12, varistor RV2 in parallel between described resistance R6, R15；The utility model is connected R6, R12, R15 tri- resistance respectively in every circuitry phase; it prevents from burning out element in circuit because electric current is excessive in circuit; and connect tri- resistance of varistor RV1, RV2, RV3 respectively between every two-phase voltage; it protects circuit not burnt out by high voltage, it is anti-interference to absorb lightning surge.

Description

A kind of alternating current-direct current leakage current detection protection circuit

Technical field

The utility model relates to protect field of circuit technology more particularly to a kind of alternating current-direct current leakage current detection protection circuit.

Background technique

In view of power circuit, there are some unstable factors, and are designed to prevent such unstable factor from influencing circuit effect The circuit of fruit, which is referred to as, protects circuit, than if any overcurrent protection, overvoltage protection, overheating protection, no-load protection, short-circuit protection etc..

With the development of technology, various high current electric appliances need to input high current AC DC electricity, new-energy automobile it is fast Speed development, various outdoor charging piles are more and more, and in addition for some outdoor Solar lamp electrical equipments, earth leakage protective is very heavy It wants, earth leakage protective device is used widely at present, is primarily used to when leak current fault occurs for equipment and to there is fatal risk Personal electrical shock protection；But the electric leakage of existing market is only used for alternating current, as market is more and more extensive to electric electricity demanding, than Such as direct-current charging post, solar power generation requires DC leakage protection.

In addition circuit for electric leakage protector conveying is transported on Rechargeable socket row by high-tension bus-bar, and lightning surge is due to dodging High voltage transient or high current phenomenon are generated when electric, electric switch motion, the electrical part in circuit can be damaged, sternly It may be caused an accident when weight, and the protection circuit of current earth leakage protective device is difficult to meet and detects in time and play current protection Effect, it is difficult to the safety for reaching the protection person or equipment, so that a kind of alternating current-direct current leakage current detection protection circuit is very necessary.

Utility model content

Purpose of the utility model is to solve problem of the prior art, and a kind of alternating current-direct current detection of electrical leakage proposed is protected Protection circuit.

To achieve the goals above, the utility model adopts the technical scheme that

A kind of alternating current-direct current leakage current detection protection circuit, including current protecting circuit, rectification circuit, voltage protection circuit, can Silicon circuit, reduction voltage circuit, filter circuit and leakage current detection circuit are controlled, the current protecting circuit includes being connected on three-phase respectively R6, R12, R15 of resistance in power supply, varistor RV1 in parallel between described resistance R6, R12, between described resistance R6, R15 simultaneously Join varistor RV2, varistor RV3 in parallel between described resistance R12, R15.

Preferably, the rectification circuit includes diode D2, D3, D4, D6, D7, D8, diode D2, D3, D4 output It holds and is connected after being connected with voltage protection circuit input terminal, the connected rear and silicon-controlled output end of diode D6, D7, D8 input terminal It is connected, the diode D2 input terminal, diode D6 output end are connected after being connected with the power supply for being in series with R6, the diode D3 input terminal, diode D7 output end are connected after being connected with the power supply for being in series with R12, the diode D4 input terminal, two poles Pipe D8 output end is connected after being connected with the power supply for being in series with R15.

Preferably, the voltage protection circuit includes buckle releaser L1, and the buckle releaser L1 input terminal and D2, D3, D4 are exported End is connected, and the buckle releaser L1 output end is connected with ghyristor circuit input terminal.

Preferably, the voltage protection circuit further includes diode D1, and the diode D1 input terminal and buckle releaser L1 are defeated Outlet be connected after is connected with ghyristor circuit input terminal, the diode D1 output end be connected with buckle releaser L1 input terminal afterwards with D2, D3, D4 output end are connected.

Preferably, the ghyristor circuit includes controlled silicon chip CR1, CR2, capacitor C1, C4, resistance R3, R7 and R16, The controlled silicon chip CR1 Shangyang is extremely connected with voltage protection circuit output end, under the controlled silicon chip CR1 cathode terminal with Controlled silicon chip CR2 Shangyang is extremely connected, and cathode terminal is connected with rectification circuit input end under the controlled silicon chip CR2, described Capacitor C1 and resistance R7 is connected in parallel on the control of CR1 extremely between lower cathode terminal, and the capacitor C4 and resistance R16 are connected in parallel on controllably The control of silicon chip CR2 is extremely extremely connected on voltage by resistance R3 and protects with lower cathode terminal, the controlled silicon chip CR1 control Protection circuit output end.

Preferably, the reduction voltage circuit includes resistance R1, R2, R4, R5, R8, R9, R10, R11, R13, R14, the resistance Be connected after R1, R2 are in parallel with voltage protection circuit output end, the R1 and R2 it is in parallel after, R4 and R5 it is in parallel after, R8 and R9 parallel connection Afterwards, it is sequentially connected in series after R10 and R11 is in parallel, after R13 and R14 parallel connection, it is defeated with filter circuit after described resistance R13, R14 are in parallel Enter end to be connected.

Preferably, the filter circuit includes that capacitor C3 and the both ends electrolytic capacitor C2, the capacitor C3 are connected in parallel on pressure stabilizing two The cathode terminal and anode tap of pole pipe D5, the electrolytic capacitor C2 positive terminal are connected with the output end of reduction voltage circuit, the electrolysis electricity Hold C2 negative pole end to be connected with rectification circuit input end.

Preferably, the leakage current detection circuit include all phase high speed earth leakage protective chip CS6122, resistance R17, R18, capacitor C5, C6, C7, C8, C10 and input coil, the both ends the resistance R18 are connect respectively on two leads of input coil, No. 2 input signal pins and No. 3 electricity of the resistance R18 and the both ends capacitor C7 and all phase high speed earth leakage protective chip CS6122 Source capsule foot is connected, the both ends the capacitor C6 No. 2 input signal pins with all phase high speed earth leakage protective chip CS6122 respectively Be connected with No. 1 pin, described capacitor C10, C8 be connected to all phase high speed earth leakage protective chip CS6122 No. 3 power pins and Between No. 7 pins, the capacitor C5 be connected to all phase high speed earth leakage protective chip CS6122 No. 4 pins and No. 8 pins it Between, the resistance R17 is connected between No. 4 pins and No. 7 pins of all phase high speed earth leakage protective chip CS6122.

Compared with prior art, the utility model provides a kind of alternating current-direct current leakage current detection protection circuit, and having following has Beneficial effect:

1, the three phase mains that 380V is obtained from power grid, R6, R12, R15 tri- electricity of connecting respectively in every circuitry phase Resistance prevents from burning out element in circuit because electric current is excessive in circuit, and between every two-phase voltage respectively and couple RV1, Tri- varistors of RV2, RV3, protect circuit not burnt out by high voltage, and it is anti-interference to absorb lightning surge.

2, the three-phase electricity exported from current protecting circuit is still alternating current, utilizes D2, D3, D4, D6, D7, D8 six The rectifier circuit of diode composition, sampling halfwave rectifier method are that the voltage of output always keeps a forward voltage.

3, voltage protection circuit is mainly made of buckle releaser L1 and diode D1, when rectification circuit output voltage it is excessive or When electric current is excessive, buckle releaser L1 cuts off the power rapidly, to protect circuit and prevent from getting an electric shock, the cathode of diode D1 is connected to rectification On circuit output voltage, anode is connected to the output end of buckle releaser L1, and the voltage of output is made to be less than Output Voltage in Rectified Circuits forever, Diode D1 prevents voltage from flowing back, and burns out circuit.

4, the voltage of voltage protection circuit output controls the on-off of subsequent conditioning circuit by two controlled silicon chips CR1 and CR2； By the on-off of the external all phase high speed earth leakage protective chip CS6122 SCRT instruction control CR1 and CR2 generated, when having To control electrode when SCRT is instructed, first passes through C4 and R16 and filter out noise jamming caused by transmission instructs, CR2 is connected, makes CR2's Anode A is pulled to level, i.e. the cathode K of CR1 is low level, and CR1 is connected, and C1, R7 filter out silicon-controlled CR1, and CR2 is produced when being connected Raw noise.

5, reduction voltage circuit: including resistance R1, R2, R4, R5, R8, R9, R10, R11, R13, R14, the voltage protection circuit Input terminal after the voltage of output is in parallel with resistance R1, R2 is connected, R1 and R2 it is in parallel after, R4 and R5 it is in parallel after, R8 and R9 parallel connection Afterwards, it after R10 and R11 is in parallel, after R13 and R14 parallel connection, then is sequentially connected in series and is depressured, increase the driving capability to circuit, it is ensured that Circuit can bear bigger electric current, and resistance R13, R14 parallel connection are connected with the input terminal of filter circuit.

6, filter circuit: stablize the voltage 5V of output, by electrolytic capacitor C2, the shunt capacitance of C3 filters out noise, passes through Zener diode D5 makes the voltage stabilization of output, and supply voltage is cleaner.

7, leakage current detection circuit: it can detecte AC signal also and can detecte pulsating direct current signal；This circuit can be applied In A type and AC type open circuit, SCR instruction is generated, all phase high speed earth leakage protective chip CS6122, resistance R17, R18, capacitor are passed through C5, C6, C7, C8, C10 and input coil generate SCR instruction；It is leaked electricity by resistance R18 and the both ends capacitor C7 and all phase high speed No. 2 input signal pins and No. 3 power pins for protecting chip CS6122 are connected, and filter out input signal and what power supply generated makes an uproar Sound；By all phase high speed earth leakage protective chip CS6122 No. 2 input signal pins and No. 3 power pins connect filter respectively Wave capacitor C6 and C10, filter out the noise that input pin and power pin itself generate, and pass through all phase high speed earth leakage protective chip No. 8 pins of CS6122 are connect by capacitor C5 filters out DC voltage in the steady dc voltage caused by filter circuit again The ripple of generation interferes, and No. 6 pins of all phase high speed earth leakage protective chip CS6122 is made to generate SCR instruction.

Detailed description of the invention

Fig. 1 be the utility model proposes a kind of alternating current-direct current leakage current detection protection circuit circuit diagram；

Fig. 2 be the utility model proposes a kind of alternating current-direct current leakage current detection protection circuit current protecting circuit, rectified current Road, voltage protection circuit schematic diagram；

Fig. 3 be the utility model proposes a kind of alternating current-direct current leakage current detection protection circuit ghyristor circuit, reduction voltage circuit With filter circuit schematic diagram；

Fig. 4 be the utility model proposes a kind of alternating current-direct current leakage current detection protection circuit leakage current detection circuit signal Figure.

Specific embodiment

The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole Embodiment.

In the description of the present invention, it should be understood that term " on ", "lower", "front", "rear", "left", "right", The orientation or positional relationship of the instructions such as "top", "bottom", "inner", "outside" is to be based on the orientation or positional relationship shown in the drawings, and is only For ease of description the utility model and simplify description, rather than the device or element of indication or suggestion meaning must have it is specific Orientation, be constructed and operated in a specific orientation, therefore should not be understood as limiting the present invention.

Embodiment 1:

Referring to Fig.1-2, a kind of alternating current-direct current leakage current detection protection circuit, including current protecting circuit, rectification circuit, voltage are protected Protection circuit, ghyristor circuit, reduction voltage circuit, filter circuit and leakage current detection circuit, current protecting circuit include connecting respectively R6, R12, R15 of resistance in three phase mains, varistor RV1 in parallel, in parallel between resistance R6, R15 between resistance R6, R12 Varistor RV2, varistor RV3 in parallel, obtains the three phase mains of 380V, in every phase from power grid between resistance R12, R15 Series connection R6, R12, R15 tri- resistance is distinguished in circuit, prevents from burning out element in circuit because electric current is excessive in circuit, And respectively and couple tri- varistors of RV1, RV2, RV3 between every two-phase voltage.

Rectification circuit includes diode D2, D3, D4, D6, D7, D8, the connected rear and voltage of diode D2, D3, D4 output end Circuit input end is protected to be connected, diode D6, D7, D8 input terminal is connected after being connected with silicon-controlled output end, diode D2 input End, diode D6 output end are connected after being connected with the power supply for being in series with R6, diode D3 input terminal, diode D7 output end phase It is connected after even with the power supply for being in series with R12, after diode D4 input terminal, diode D8 output end are connected and is in series with R15's Power supply is connected, and the three-phase electricity exported from current protecting circuit is still alternating current, utilizes D2, D3, D4, D6, D7, D8 six The rectifier circuit of diode composition, sampling halfwave rectifier method are that the voltage of output always keeps a forward voltage.

Voltage protection circuit includes buckle releaser L1, and buckle releaser L1 input terminal is connected with D2, D3, D4 output end, buckle releaser L1 Output end is connected with ghyristor circuit input terminal.

Voltage protection circuit further includes diode D1, after diode D1 input terminal is connected with buckle releaser L1 output end and controllable Silicon circuit input terminal is connected, and diode D1 output end is connected after being connected with buckle releaser L1 input terminal with D2, D3, D4 output end, electricity Voltage protection circuit is mainly made of buckle releaser L1 and diode D1, when the voltage of rectification circuit output is excessive or electric current is excessive, Buckle releaser L1 cuts off the power rapidly, to protect circuit and prevent from getting an electric shock, the cathode of diode D1 is connected to rectification circuit output electricity In pressure, anode is connected to the output end of buckle releaser L1, and the voltage of output is made to be less than Output Voltage in Rectified Circuits forever, and diode D1 is anti- Only voltage flows back, and burns out circuit.

Embodiment 2:

Referring to Fig.1-4: a kind of alternating current-direct current leakage current detection protection circuit, it is substantially the same manner as Example 1, it further, can Controlling silicon circuit includes controlled silicon chip CR1, CR2, capacitor C1, C4, resistance R3, R7 and R16, and controlled silicon chip CR1 Shangyang is extreme It is connected with voltage protection circuit output end, cathode terminal is extremely connected with controlled silicon chip CR2 Shangyang under controlled silicon chip CR1, can Cathode terminal is connected with rectification circuit input end under control silicon chip CR2, and capacitor C1 and resistance R7 are connected in parallel on the control of CR1 extremely under Between cathode terminal, capacitor C4 and resistance R16 are connected in parallel on the control of controlled silicon chip CR2 extremely and lower cathode terminal, controlled silicon chip CR1 control is extreme to be connected on voltage protection circuit output end by resistance R3, and the voltage of voltage protection circuit output passes through two The on-off of controlled silicon chip CR1 and CR2 control subsequent conditioning circuit；It is produced by external all phase high speed earth leakage protective chip CS6122 The on-off of raw SCRT instruction control CR1 and CR2 first passes through C4 and R16 and filters out transmission and refer to when there is SCRT instruction to control electrode Noise jamming caused by enabling, is connected CR2, so that the anode A of CR2 is pulled to level, i.e. the cathode K of CR1 is low level, and makes CR1 Conducting, C1, R7 filter out silicon-controlled CR1, the noise that CR2 is generated when being connected.

Reduction voltage circuit includes resistance R1, R2, R4, R5, R8, R9, R10, R11, R13, R14, after resistance R1, R2 are in parallel with electricity Voltage protection circuit output end is connected, after R1 and R2 are in parallel, R4 and R5 it is in parallel after, R8 and R9 it is in parallel after, R10 and R11 it is in parallel after, It is sequentially connected in series after R13 and R14 is in parallel, is connected after resistance R13, R14 are in parallel with the input terminal of filter circuit, reduction voltage circuit: including Resistance R1, R2, R4, R5, R8, R9, R10, R11, R13, R14, after the voltage of voltage protection circuit output is in parallel with resistance R1, R2 Input terminal be connected, after R1 and R2 are in parallel, R4 and R5 it is in parallel after, R8 and R9 it is in parallel after, R10 and R11 it is in parallel after, R13 and R14 simultaneously It after connection, then is sequentially connected in series and is depressured, increase the driving capability to circuit, it is ensured that circuit can bear bigger electric current, resistance R13, R14 parallel connection are connected with the input terminal of filter circuit.

Filter circuit includes capacitor C3 and electrolytic capacitor C2, the both ends capacitor C3 be connected in parallel on zener diode D5 cathode terminal and Anode tap, electrolytic capacitor C2 positive terminal are connected with the output end of reduction voltage circuit, and electrolytic capacitor C2 negative pole end and rectification circuit input End is connected, and stablizes the voltage 5V of output, by electrolytic capacitor C2, the shunt capacitance of C3 filters out noise, passes through zener diode D5 Make the voltage stabilization of output, supply voltage is cleaner.

Leakage current detection circuit include all phase high speed earth leakage protective chip CS6122, resistance R17, R18, capacitor C5, C6, C7, C8, C10 and input coil, input coil are wrapped on three phase mains, and the both ends resistance R18 are connect respectively at input coil two On lead, No. 2 input signal pins and 3 of resistance R18 and the both ends capacitor C7 and all phase high speed earth leakage protective chip CS6122 Number power pin is connected, the both ends capacitor C6 No. 2 input signal pins with all phase high speed earth leakage protective chip CS6122 respectively Be connected with No. 1 pin, capacitor C10, C8 be connected to all phase high speed earth leakage protective chip CS6122 No. 3 power pins and No. 7 Between pin, capacitor C5 is connected between No. 4 pins and No. 8 pins of all phase high speed earth leakage protective chip CS6122, resistance R17 is connected between No. 4 pins and No. 7 pins of all phase high speed earth leakage protective chip CS6122, leakage current detection circuit: can It can detecte pulsating direct current signal to detect AC signal also；This circuit can be applied to A type and AC type open circuit, generate SCR instruction, By all phase high speed earth leakage protective chip CS6122, resistance R17, R18, capacitor C5, C6, C7, C8, C10 and input coil are produced Raw SCR instruction；Pass through No. 2 input signals of resistance R18 and the both ends capacitor C7 and all phase high speed earth leakage protective chip CS6122 Pin and No. 3 power pins are connected, and filter out the noise of input signal and power supply generation；By all phase high speed earth leakage protective core No. 2 input signal pins of piece CS6122 and No. 3 power pins connect filter capacitor C6 and C10 respectively, filter out input pin and The noise that power pin itself generates is connect by No. 8 pins of all phase high speed earth leakage protective chip CS6122 by capacitor C5 The ripple interference for filtering out DC voltage generation in the steady dc voltage caused by filter circuit again, makes all phase high speed No. 6 pins of earth leakage protective chip CS6122 generate SCR instruction.

The preferable specific embodiment of the above, only the utility model, but the protection scope of the utility model is not It is confined to this, anyone skilled in the art is within the technical scope disclosed by the utility model, practical according to this Novel technical solution and its utility model design are subject to equivalent substitution or change, should all cover the protection model in the utility model Within enclosing.

Claims (8)

1. a kind of alternating current-direct current leakage current detection protection circuit, which is characterized in that protected including current protecting circuit, rectification circuit, voltage Protection circuit, ghyristor circuit, reduction voltage circuit, filter circuit and leakage current detection circuit, the current protecting circuit include difference It is connected on R6, R12, R15 of resistance in three phase mains, varistor RV1 in parallel, the resistance between described resistance R6, R12 Varistor RV2 in parallel between R6, R15, varistor RV3 in parallel between described resistance R12, R15.

2. a kind of alternating current-direct current leakage current detection protection circuit according to claim 1, which is characterized in that the rectification circuit packet Include diode D2, D3, D4, D6, D7, D8, the connected rear and voltage protection circuit input terminal of diode D2, D3, D4 output end It is connected, diode D6, D7, D8 input terminal is connected after being connected with silicon-controlled output end, the diode D2 input terminal, two poles Pipe D6 output end is connected after being connected with the power supply for being in series with R6, and the diode D3 input terminal, diode D7 output end are connected It is connected afterwards with the power supply for being in series with R12, the diode D4 input terminal, diode D8 output end are connected rear and are in series with R15 Power supply be connected.

3. a kind of alternating current-direct current leakage current detection protection circuit according to claim 2, which is characterized in that the voltage protection electricity Road includes buckle releaser L1, and the buckle releaser L1 input terminal is connected with D2, D3, D4 output end, the buckle releaser L1 output end with can Silicon circuit input terminal is controlled to be connected.

4. a kind of alternating current-direct current leakage current detection protection circuit according to claim 3, which is characterized in that the voltage protection electricity Road further includes diode D1, the diode D1 input terminal be connected with buckle releaser L1 output end after and ghyristor circuit input terminal phase Even, the diode D1 output end is connected after being connected with buckle releaser L1 input terminal with D2, D3, D4 output end.

5. a kind of alternating current-direct current leakage current detection protection circuit according to claim 1, which is characterized in that the ghyristor circuit Including controlled silicon chip CR1, CR2, capacitor C1, C4, resistance R3, R7 and R16, the controlled silicon chip CR1 Shangyang extremely with electricity Voltage protection circuit output end is connected, and cathode terminal is extremely connected with controlled silicon chip CR2 Shangyang under the controlled silicon chip CR1, institute It states cathode terminal under controlled silicon chip CR2 to be connected with rectification circuit input end, the capacitor C1 and resistance R7 are connected in parallel on the control of CR1 Extremely between lower cathode terminal, the capacitor C4 and resistance R16 are connected in parallel on the control of controlled silicon chip CR2 extremely and lower cathode End, the controlled silicon chip CR1 control is extreme to be connected on voltage protection circuit output end by resistance R3.

6. a kind of alternating current-direct current leakage current detection protection circuit according to claim 1 or 5, which is characterized in that the decompression electricity Road includes resistance R1, R2, R4, R5, R8, R9, R10, R11, R13, R14, after described resistance R1, R2 are in parallel with voltage protection circuit Output end is connected, after the R1 and R2 are in parallel, R4 and R5 it is in parallel after, R8 and R9 it is in parallel after, R10 and R11 it is in parallel after, R13 and R14 It is sequentially connected in series after parallel connection, is connected after described resistance R13, R14 are in parallel with the input terminal of filter circuit.

7. a kind of alternating current-direct current leakage current detection protection circuit according to claim 6, which is characterized in that the filter circuit packet It includes capacitor C3 and the both ends electrolytic capacitor C2, the capacitor C3 is connected in parallel on the cathode terminal and anode tap of zener diode D5, the electricity Solution capacitor C2 positive terminal is connected with the output end of reduction voltage circuit, the electrolytic capacitor C2 negative pole end and rectification circuit input end phase Even.

8. a kind of alternating current-direct current leakage current detection protection circuit according to claim 1, which is characterized in that the leakage current test Circuit includes all phase high speed earth leakage protective chip CS6122, resistance R17, R18, capacitor C5, C6, C7, C8, C10 and input line Circle, the both ends the resistance R18 connect respectively on two leads of input coil, the resistance R18 and the both ends capacitor C7 and all phase No. 2 input signal pins of high speed earth leakage protective chip CS6122 and No. 3 power pins are connected, the both ends the capacitor C6 respectively with No. 2 input signal pins of all phase high speed earth leakage protective chip CS6122 and No. 1 pin are connected, capacitor C10, C8 connection Between No. 3 power pins and No. 7 pins of all phase high speed earth leakage protective chip CS6122, the capacitor C5 is connected to full phase Between No. 4 pins and No. 8 pins of position high speed earth leakage protective chip CS6122, the resistance R17 is connected to all phase high speed and leaks Between No. 4 pins and No. 7 pins of electric protection chip CS6122.