CN220585973U

CN220585973U - Novel ground zero live wire dual supply circuit protection system

Info

Publication number: CN220585973U
Application number: CN202320996202.0U
Authority: CN
Inventors: 杨林
Original assignee: Individual
Current assignee: Individual
Priority date: 2023-04-27
Filing date: 2023-04-27
Publication date: 2024-03-12
Anticipated expiration: 2033-04-27

Abstract

The utility model relates to the technical field of power supply circuits, in particular to a ground zero and live wire dual-power circuit protection system. The technical scheme is as follows: the device comprises a live wire, a zero wire, an overload breaker, a direct current power supply module, a central control module and a circuit protection module, wherein the direct current positive electrode of the direct current power supply module is connected to the output zero wire, and the direct current negative electrode is used as a ground wire; the central control module comprises a relay and a coil control circuit, and a plurality of trigger protection circuits of the circuit protection module are connected with coils of the relay through the coil control circuit to control on-off of alternating current. The beneficial effects are that: the zero line and the ground wire are utilized to output low-voltage direct current, the ground zero line and the ground wire are utilized to output double power supplies, meanwhile, the low-voltage direct current and the relay are utilized to control an alternating current circuit, detection circuits of various abnormal conditions are convenient to integrate, the power-off protection for various abnormal conditions is realized through the on-off control of the relay, and the overall safety and the practicability of the power supply circuit are effectively improved.

Description

Novel ground zero live wire dual supply circuit protection system

Technical Field

The utility model relates to the technical field of power supply circuits, in particular to a novel ground zero and live wire dual-power circuit protection system.

Background

At present, a three-wire system power supply system consisting of a live wire, a zero wire and a ground wire is basically adopted for household power supply, in the existing common household power supply system, protection of an alternating current power supply system is only stopped at the live wire and the zero wire input to the front end, and a circuit breaking protector is arranged, so that protection functions of overcurrent, overload, overvoltage and undervoltage, short circuit, surge prevention, phase failure, contact leakage and the like are required to be added in a module mode, and a user only can select a part for addition under the limitation of space of a distribution box. Meanwhile, other abnormal conditions of a power supply circuit system, such as electric leakage, zero line disconnection, partial line overload and the like, cannot be effectively protected. The following problems are presented in detail: 1. when a distribution line with low bearing power is connected to a high-power load by mistake in the circuit, overload condition can occur in the line, and an overload open-circuit protector at the front end can not trigger disconnection because the overload open-circuit protector can not reach protection current, and continuous power supply can cause the overload line to have fire hazard. 2. When the circuit is broken by the aging virtual connection of the zero line, the loose line resistance is increased to heat and damage the opposite joint point, the zero line in the circuit is electrified, and the connected electric equipment is electrified, so that the danger of electric shock to a human body is caused; when the zero line connected to the mains supply is disconnected, the follow-up circuit is electrified in the circuit without phase-failure protection, so that the personal safety and the danger are caused. 3. The power supply circuit is not provided with an abnormal self-checking function and three-wire ground zero fire reverse connection preventing capability, and the ground protection cannot identify whether the power supply circuit is induction current or leakage current of equipment, so that the leakage protector is easy to trip, and dangerous overcurrent can occur due to short circuit between a live wire and a ground shell. 4. In a common household power supply system, the ground wire is only used for protecting the ground wire, the purpose is single, the protection of the ground wire by a user can be achieved, part of users even abandon to install the ground wire, and only use a two-wire system power supply system of a live wire and a zero wire, so that induced currents exist in some electric equipment to enable a metal shell to be electrified, a current loop can be released through a human body, the probability of electric shock accidents is improved, and in some places with larger ground insulation capability, the electric shock leakage current of the human body is smaller, and the action of a circuit leakage protector cannot be triggered. 5. The environment detection sensing capability can not be expanded, and when gas leakage occurs, the fire accident provides the functions of breaking and alarming. 6. The existing protection device is single in protectiveness, limited in user selection and lacks comprehensive safety protection capability for a circuit.

Disclosure of Invention

The utility model aims to provide a novel ground zero-live wire dual-power circuit protection system, in particular to a dual-power circuit protection system which can simultaneously provide alternating current and low-voltage direct current and can perform self-checking and trigger protection on leakage current or other abnormal conditions in an integral power supply circuit system.

In order to achieve the above purpose, the utility model adopts the following technical scheme: the novel ground zero-fire wire double-power-supply circuit protection system comprises an input fire wire, an input zero wire, an overload breaker, a direct-current power supply module, a central control module and a circuit protection module, wherein the input fire wire and the input zero wire are connected with the input zero wire and then output a first output fire wire and a first output zero wire; the central control module comprises a relay and a coil control circuit, and the circuit protection module comprises a plurality of trigger protection circuits of different types; the switch of the relay is connected with a first output live wire, the first output live wire is connected with the switch of the relay and then is used as a power supply output live wire, and a plurality of trigger protection circuits of the circuit protection module are respectively connected with a coil of the relay through a coil control circuit; and the power supply output zero line and the power supply output ground line supply power for the circuit protection module and the central control module.

Specifically, the coil control circuit of the central control module adopts a triode switch circuit, and the trigger protection circuit controls the on-off of the triode switch circuit of the coil control circuit by controlling the base potential of the triode switch circuit of the coil control circuit so as to control the on-off of the coil of the relay.

Specifically, the circuit protection module at least comprises a leakage current detection module, the leakage current detection module comprises a voltage clamping circuit and an optical coupler detection circuit, the voltage clamping circuit is connected between a power supply output ground wire and a first output zero line, two ends of the voltage clamping circuit are connected to the input end of the optical coupler detection circuit, and the output end of the optical coupler detection circuit is connected to the base electrode of the triode switch circuit of the coil control circuit and the base electrode potential of the transmitting electrode pair triode switch circuit.

Specifically, a pulse width driving circuit and a switching tube circuit are arranged in the direct current power supply module, the switching tube circuit is connected between the negative electrode of the direct current and a power supply output ground wire, a power supply output live wire and a power supply output zero line are connected with the pulse width driving circuit in an input mode, and the pulse width driving circuit outputs pulse switching signals with certain frequency and a duty ratio of not less than 90% to the control end of the switching tube circuit to control on-off of the negative electrode of the direct current and the power supply output ground wire.

Specifically, a direct current control circuit is further arranged in the direct current power supply module, the direct current control circuit comprises a control trigger circuit and a switch control circuit, the control trigger circuit adopts a triode switch circuit, the switch control circuit adopts a triode interlocking switch circuit, the switch control circuit triggers the triode switch circuit of the control trigger circuit to be turned on or off through a triode for controlling the triode interlocking switch circuit to be conducted, and the on/off of the triode switch circuit of the control trigger circuit controls the electric potential of the control end of the switch circuit to realize the on/off control of the direct current power supply module.

Further, the circuit protection module further comprises an overvoltage and undervoltage trigger protection circuit, the overvoltage and undervoltage trigger protection circuit is composed of two groups of optocoupler switch circuits, wherein the input end of a light emitting source of one group of optocoupler switch circuits is connected with a zener diode ZD1 in series to serve as an undervoltage trigger circuit, and the input end of a light emitting source of the other group of optocoupler switch circuits is connected with a zener diode ZD2 in series to serve as an overvoltage trigger circuit; and the under-voltage trigger circuit and the over-voltage trigger circuit are respectively connected with the triode switch circuit of the coil control circuit.

Further, the circuit protection module further comprises a residual current trigger protection circuit, the residual current trigger protection circuit comprises a transformer PT1 and a residual current trigger circuit, an induction coil of the transformer PT1 is arranged at a first output live wire and a first output zero line to detect residual current, the transformer PT1 is output and connected to the residual current trigger circuit, and the residual current trigger circuit adopts a triode switch circuit and is output and connected to a triode switch circuit of the coil control circuit.

Further, the circuit protection module further comprises an overcurrent overload trigger protection circuit, the overcurrent overload trigger protection circuit comprises a transformer PT2 and an overcurrent overload trigger circuit, an induction coil of the transformer PT2 is arranged at a first output live wire to detect total current of the circuit, the output of the transformer PT2 is connected to the overcurrent overload trigger circuit, and the overcurrent overload trigger circuit adopts a triode switch circuit and is output to be connected to a triode switch circuit of the coil control circuit.

Further, the environment monitoring trigger circuit comprises a monitoring sensor and a switch circuit, wherein the output of the monitoring sensor is connected to the switch circuit to control the on or off of the switch circuit, and the switch circuit is connected between a power supply output live wire and a power supply output ground wire.

Further, the power supply circuit further comprises a tail end overload protection circuit, the tail end overload protection circuit adopts a bimetallic strip thermosensitive trigger element RT2, two normally conducted ends of the bimetallic strip thermosensitive trigger element RT2 are connected to a power supply output fire wire in series, and an overheat trigger end of the bimetallic strip thermosensitive trigger element RT2 is connected to a power supply output ground wire.

Further, the power supply circuit further comprises a zero line detection circuit, wherein the zero line detection circuit is connected between a power supply output zero line and a power supply output ground line at a load end, and the zero line detection circuit is formed by connecting a rectifier diode D12, a transient diode ZD8 and a current limiting resistor R50 in series.

Specifically, a power supply output zero line and a power supply output ground line are connected with a low-voltage direct current load through rectifier diode output.

Specifically, the voltage dependent resistor is connected in parallel to the two ends of the power supply output zero line and the power supply output ground line and then output to be connected to the low-voltage direct current load.

The utility model has the beneficial effects that: the zero line and the ground wire are utilized to output low-voltage direct current, the ground zero line and the ground wire are utilized to output double power supplies, meanwhile, the low-voltage direct current and the relay are utilized to control an alternating current circuit, detection circuits of various abnormal conditions are convenient to integrate, and power-off protection for various abnormal conditions is realized through on-off control of the relay, so that the overall safety and practicability of a power supply circuit are effectively improved.

Drawings

FIG. 1 is a circuit diagram of the overall connection of a ground zero-fire wire dual power circuit protection system in an embodiment;

FIG. 2 is a circuit diagram showing the connection of the central control module and the over-voltage and under-voltage trigger protection circuit of FIG. 1;

FIG. 3 is a circuit diagram showing the connection of the AC switch circuit and the audible alarm circuit of FIG. 1;

FIG. 4 is a circuit diagram showing the residual current trigger protection circuit of FIG. 1;

FIG. 5 is a circuit diagram showing the overcurrent overload trigger protection circuit of FIG. 1;

FIG. 6 is a circuit diagram showing the leakage current detection module of FIG. 1;

FIG. 7 is a circuit diagram showing the pulse width driving circuit of FIG. 1;

FIG. 8 is a circuit diagram showing the DC control circuit of FIG. 1;

FIG. 9 is a schematic diagram showing specific circuit connections of the heat sink circuit, the under-voltage protection circuit, the switching tube circuit, the AC-DC circuit UD1 and the battery GB1 shown in FIG. 1;

FIG. 10 is a schematic circuit diagram showing the connection of the portion A of FIG. 1;

FIG. 11 is a schematic circuit diagram showing the connection of the circuit of section B of FIG. 1;

FIG. 12 is a circuit diagram showing a specific connection of an environmental monitoring trigger circuit;

fig. 13 is a specific circuit connection diagram of the portion C in fig. 1.

Description of the embodiments

1, referring to fig. 1-13, a novel ground zero-line dual-power circuit protection system comprises an input live line L0, an input neutral line N0, an overload breaker QF1, a direct-current power module 1, a central control module 2 and a circuit protection module 3, wherein the input live line L0 and the input neutral line N0 are connected with the overload breaker QF1 and then output a first output live line L1 and a first output neutral line N1, the first output live line L1 and the first output neutral line N1 supply power for the direct-current power module 1, the direct-current power module 1 outputs a direct-current positive electrode v+ and a direct-current negative electrode V-, and the direct-current positive electrode v+ is connected to the first output neutral line N1 as a power supply output neutral line n+ and the direct-current negative electrode V-is used as a power supply output ground line PE-; the central control module 2 comprises a relay MK1 and a coil control circuit 21, and the circuit protection module 3 comprises a plurality of trigger protection circuits of different types; the switch of the relay MK1 is connected to a first output live wire L1, the first output live wire L1 is connected with a switch 23 of the relay MK1 and then is used as a power supply output live wire L, and a plurality of trigger protection circuits of the circuit protection module 3 are respectively connected with a coil 22 of the relay MK1 through a coil control circuit 21; the power supply output zero line N+ and the power supply output ground line PE-supply power for the circuit protection module 3 and the central control module 2.

In this embodiment, the input live wire L0 and the input neutral wire N0 are the live wire and the neutral wire of the utility power input, the input live wire L0 and the input neutral wire N0 are connected with the overload circuit breaker QF1 and output the first output live wire L1 and the first output neutral wire N1, the first output live wire L1 and the first output neutral wire N1 passing through the overload circuit breaker QF1 are equivalent to the household circuit conventionally used at present, the dc power supply module 1, the central control module 2 and the circuit protection module 3 in this embodiment can be integrated together, and the first output live wire L1 and the first output neutral wire N1 are taken as inputs, and the power supply output live wire L, the power supply output neutral wire n+ and the power supply output ground wire PE-are taken as outputs to be connected with each electrical load. The direct current power supply module 1 takes household alternating current provided by the first output live wire L1 and the first output zero line N1 as input, and outputs low-voltage direct current to the power supply output zero line N+ and the power supply output ground line PE-, so that the power supply output zero line N+ and the power supply output ground line PE-can be used as low-voltage direct current power supplies to supply power to corresponding electric equipment, and specifically, the direct current power supply module 1 comprises an alternating current-to-direct current circuit UD1 and a storage battery GB1, the alternating current-to-direct current circuit UD1 converts the alternating current into the low-voltage direct current and charges the storage battery GB1, and the storage battery GB1 outputs the low-voltage direct current and can still output the low-voltage direct current as a standby power supply for use when power fails. Meanwhile, the dc power supply module 1 may supply power to the central control module 2 and the circuit protection module 3, where the central control module 2 is configured to control ac power output by the power supply output live wire L and the power supply output zero line n+, and specifically, the central control module 2 includes a relay MK1 and a coil control circuit 21, where the coil control circuit 21 is configured to control on-off of a coil 22 of the relay MK1, the first output live wire L1 is connected to a switch 23 of the relay MK1 and outputs as the power supply output live wire L, and the coil control circuit 21 controls on-off of the switch 23 of the relay MK1 by switching on-off of the coil 22 of the relay MK1, so as to control on-off of the power supply output live wire L; the trigger protection circuits of different types included in the circuit protection module 3 can detect various abnormal conditions occurring in the power supply circuit and trigger the control of the coil control circuit 21, so that the power utilization safety of the power supply circuit is effectively realized.

Specifically, the coil control circuit 21 of the central control module 2 adopts a triode switch circuit, and the trigger protection circuit 3 controls the on-off of the triode switch circuit of the coil control circuit 21 by controlling the base potential of the triode switch circuit of the coil control circuit 21 so as to control the on-off of the coil 22 of the relay MK 1. Specifically, the triode switch circuit of the coil control circuit 21 includes triodes Q4, Q5, Q6, current limiting resistors R7, R8, R9, a power supply output zero line n+ is connected to the collector of Q4 after passing through the coil 22 of the relay MK1, the power supply output zero line n+ is connected to the base of Q4 and the collector of Q5 after passing through R7, the power supply output zero line is connected to the base of Q5 and the collector of Q6 after passing through R8, the power supply output zero line n+ is connected to the base of the triode Q6 after passing through the current limiting resistor R9, the emitters of the triodes Q4, Q5, Q6 are connected to the power supply output ground line PE-, a capacitor C3 is connected between the base and the emitter of Q4 together, and the two ends of the coil 22 of the relay MK1 are connected with a freewheeling diode D7; when the coil control circuit 21 needs to be triggered to be turned on or off, the control can be realized by controlling the base potential of the Q4 or the base potential of the Q6, and the Q4 can be turned off by triggering the base potential of the Q4 or the Q6 to be reduced to a low level, so that the coil control circuit 21 is turned off and the coil 22 is powered off. In addition, the current limiting resistor R3 and the light emitting diode LED3 can be connected to two ends of the coil 22 of the relay MK1 to display the on-off state of the coil, when the coil 22 is turned on, the power supply output live wire L is turned on, the alternating current works normally, and at this time, the light emitting diode LED3 is turned on to emit light.

The circuit protection module 3 at least comprises a leakage current detection module 31, wherein the leakage current detection module 31 comprises a voltage clamping circuit and an optical coupler detection circuit, the voltage clamping circuit is connected between a power supply output ground line PE-and a first output zero line N1, two ends of the voltage clamping circuit are connected to the input end of the optical coupler detection circuit, and the output end of the optical coupler detection circuit is connected to the base electrode of a triode switch circuit of the coil control circuit 21 and the base electrode potential of the triode switch circuit is controlled by an emission electrode; the leakage current in the circuit is absorbed by the first output zero line N1 through the power supply output ground wire PE-through the voltage clamping circuit, and because the leakage current comprises positive current and negative current, the voltage clamping circuit also comprises two groups of corresponding forward conduction and reverse conduction, the optocoupler detection circuit also comprises a trigger circuit for triggering the turn-off of the coil control circuit, the trigger circuit comprises a current limiting resistor R23, a current limiting resistor R24, a triode Q15 and a triode Q16, the forward conduction voltage clamping circuit consists of a power rectifying diode D4 and a power rectifying diode D5 which are connected in series, the voltage clamping circuit which is connected in series by the power rectifying diode D6 and a piezoresistor VDR2 which is connected in reverse, and the optocoupler detection circuit which is connected in series by the power rectifying diode D6 and the piezoresistor VDR2 is also composed of the optocoupler U3, the current limiting resistor R25 and the piezoresistor ZD 4. In addition, in the central control module 2, an ac switch circuit 24 and a sound alarm circuit 25 may be further provided, where the ac switch circuit 24 is used to control the switching of the ac, the sound alarm circuit 25 may sound to alarm when the ac is turned off, specifically, the ac switch circuit 24 may be composed of tact switches SW1 and SW2, triodes Q7 and Q8, and resistors R10, R11, R12 and R13, where the triodes Q7 and Q8 are connected in an interlocking manner, the tact switch SW1 triggers the Q8 to turn off when pressed, so that the Q7 is turned on, the collector output of the Q7 is connected to the base of the Q6 of the coil control circuit, and when the Q7 is turned on, the Q6 is turned off, so that the Q4 is turned off, the coil is turned off, and the ac is turned off, so that the tact switch SW1 is used to turn off the ac; when the tact switch SW2 is pressed, Q7 is triggered to be turned off, so that Q8 is turned on, and Q7 is turned off, Q6 of the coil control circuit is triggered to be turned on, Q4 is turned on, the coil 22 is electrified, and the alternating current is turned on, so that the tact switch SW2 is used for turning on the alternating current. In addition, the audible alarm circuit 25 includes a resistor R14, a triode Q9 and a buzzer FM1, where the base of the triode Q9 is connected with the base of the Q7 through the resistor R14, so that the conducting state of the triode Q9 is consistent with that of the Q7, when the conducting alternating current of the Q7 is turned off, the Q9 is turned on to trigger the buzzer to conduct and send out audible alarm, meanwhile, the resistor R15 and the light emitting diode LED4 can be connected to two ends of the buzzer, and when the buzzer is turned on, the light emitting diode LED4 is also turned on to emit light and can be used as an indicator lamp for turning off the alternating current.

Because the low-voltage direct current is connected between the power supply output zero line N+ and the power supply output ground line PE-, in order to detect leakage current on the power supply output ground line PE-in real time and avoid damage to the direct current power supply module 1 caused by the leakage current, a pulse width driving circuit 11 and a switching tube circuit 12 are arranged in the direct current power supply module 1, the switching tube circuit 12 is connected between a direct current negative electrode V-and the power supply output ground line PE-, the power supply output live wire L and the power supply output zero line N+ are input and connected with the pulse width driving circuit 11, and the pulse width driving circuit 11 outputs a pulse switching signal with a certain frequency and a duty ratio of not less than 90% to a control end of the switching tube circuit 12 to control on-off of the negative electrode of the direct current and the power supply output ground line; specifically, the pulse width driving circuit 11 rectifies the alternating current input by the power supply output live wire L and the power supply output zero wire n+ by using the rectifier bridge DC4 to output a forward pulse signal with twice the mains frequency, namely 100HZ, and outputs the forward pulse signal to the light emitting source input end of the optocoupler U5, the light emitting source input end of the optocoupler U5 is simultaneously connected with the current limiting resistor R27 and the voltage stabilizing tube ZD5 in series, the on-time of the optocoupler U5 can be controlled by setting the on-voltage of the voltage stabilizing tube ZD5, the operating state of the pulse width driving circuit 11 can be displayed by connecting the light emitting diode LED5 in series, in addition, the pulse width driving circuit 11 uses the resistors R28, R29, R30 and R31 and the triodes Q17, Q18 and the capacitor C10, and uses the output end of the optocoupler U5 as a switch, so as to output a pulse switch signal with the same on-frequency as the optocoupler U5, when the output end of the optocoupler U5 is turned on, Q18 is conducted, when the optocoupler U5 is turned off, the triode Q17 is conducted, the triode Q18 is turned off, and the collector of Q18 is turned on, so that the duty ratio of the pulse switching signal output by the pulse width driving circuit 11 is the proportion of the turn-off time of the optocoupler U5, the pulse switching signal output by the pulse width driving circuit 11 controls the on-off of the switching tube circuit 12, the switching tube circuit 12 is composed of a power field effect tube Q30 capable of being frequently switched and a Schottky diode D9 in series connection, the pulse switching signal is output to the G electrode control end of the power field effect tube Q30, when the pulse switching signal is high, the trigger Q30 is conducted to enable low-voltage direct current to be communicated with a power supply output zero line N+ and a power supply output ground line PE-, when the pulse switching signal is low-level, the Q30 is turned off to enable the low-voltage direct current to be disconnected with the power supply output zero line N+ and the power supply output ground line PE-, the short time of low level output by the pulse switch signal is utilized to enable the power supply output ground line PE-to be disconnected with the direct current negative electrode briefly, so that the detection of leakage current on the power supply output ground line PE-is realized. Preferably, the duty ratio of the pulse switching signal output by the pulse width driving circuit 11 is 97% -98%.

In addition, a dc control circuit 13 is further disposed in the dc power module 1, where the dc control circuit 13 includes a control trigger circuit and a switch control circuit, the control trigger circuit uses a triode switch circuit, the switch control circuit uses a triode interlock switch circuit, the switch control circuit triggers the triode switch circuit of the control trigger circuit to turn on or off through a triode that controls the triode interlock switch circuit to turn on/off, and the control terminal of the switch circuit 12 is controlled by the on/off of the triode switch circuit of the control trigger circuit to control the on/off of the dc power module 1. Specifically, the triode interlocking switch circuit adopted by the switch control circuit is connected by a triode Q21 and a triode Q22 in an interlocking mode, only one of the Q21 and the Q22 can be conducted, when one of the Q21 and the Q22 is conducted, the other is turned off, the control trigger circuit consists of resistors R32 and R33 and triodes Q19 and Q20, when the Q21 is conducted, the Q20 is triggered to be turned off, the Q19 is conducted, the collector electrode of the Q19 is connected to the control end of the switch circuit, when the Q19 is conducted, the control end of the switch circuit 12 is in a low level, the switch circuit 12 is disconnected, so that low-voltage direct current output between a power supply output zero line N+ and a power supply output ground line PE-is turned off, otherwise, when the Q21 is turned off, the Q20 is turned on, the Q19 is turned off, and the switch circuit 12 is turned on to enable low-voltage direct current output between the power supply output zero line N+ and the power supply output ground line PE-to be turned on. By arranging a light touch switch SW3 between the base electrode and the emitter electrode of the Q22, after the light touch switch SW3 is pressed, the Q22 is triggered to be turned off, the Q21 is triggered to be turned on, and the light touch switch SW3 is used for controlling the low-voltage direct current to be turned off; when the base electrode of Q21 is connected with a triode switch circuit consisting of triodes Q24 and Q25, resistors R40, R41 and R42 and a tact switch SW4, and the SW4 is pressed down, the Q25 is triggered to be turned off, the Q24 is turned on, so that the Q21 is turned off, the Q22 is turned on, the low-voltage direct current is turned on, and the tact switch SW4 is used for starting the low-voltage direct current output between a power supply output zero line N+ and a power supply output ground line PE-. In addition, a heat dissipation circuit 14 and an under-voltage protection circuit 15 may be further disposed in the dc power module 1, where the heat dissipation circuit 14 is composed of a thermistor RT1, resistors R43 and R44, a triode Q26 and Q27, and a heat dissipation fan M1, where the R44 and RT1 are connected in series and then connected between the low-voltage dc, and two ends of the RT1 are connected between the base and the emitter of the Q27, the conduction of the Q27 is controlled by using the resistance value of the RT1 changing with temperature, when the temperature increases, the resistance value of the RT1 decreases, so that the Q27 is turned off, the Q26 is turned on, the heat dissipation fan M1 connected in series with the Q26 is triggered to perform heat dissipation, after the temperature decreases, the Q26 is turned off to turn off the heat dissipation fan M1, and two ends of the heat dissipation fan M1 are also connected with a freewheeling diode D7 for absorbing the induced electromotive current generated when the heat dissipation fan M1 is turned on or off, so as to avoid interference caused by detection of the leakage current, and an inductive load connected to a power supply output zero line and a power output ground line is also required, such as a freewheeling diode is connected in parallel to two ends of a load, such as a freewheeling diode 14D 2 parallel to two ends of a coil MK 1. The undervoltage protection circuit 15 is composed of resistors R45, R46, R47 and triodes Q28, Q29, when the voltage of the low-voltage direct current decreases, the R46 and R47 output low level to turn Q29 off, Q28 on, the collector of Q28 connected to the base of Q20, when Q28 on, Q20 off, Q19 on will be triggered to turn off, thereby turning off the low-voltage direct current between the power supply output zero line n+ and the power supply output ground line PE-.

Further, the circuit protection module 3 further includes an over-voltage and under-voltage trigger protection circuit 32, where the over-voltage and under-voltage trigger protection circuit 32 is composed of two groups of optocoupler switch circuits, where the light-emitting source input end of one group of optocoupler switch circuits is connected in series with a zener diode ZD1 as an under-voltage trigger circuit, and the light-emitting source input end of the other group of optocoupler switch circuits is connected in series with a zener diode ZD2 as an over-voltage trigger circuit; and the under-voltage trigger circuit and the over-voltage trigger circuit are respectively connected with the triode switch circuit of the coil control circuit. The over-voltage and under-voltage triggering protection circuit 32 rectifies alternating current output by the first output live wire L1 and the first output zero line N1 by utilizing a rectifier bridge DC1 to output forward pulse voltage, wherein an under-voltage triggering generation circuit is composed of a voltage stabilizing diode ZD1 and a resistor R1 which are connected in series at the input end of an optocoupler U1, an over-voltage triggering generation circuit is composed of a voltage stabilizing diode ZD2 and a resistor R2 which are connected in series at the output end of the optocoupler U2, when the voltage of the first output live wire and the first output zero line is lower than a set lower limit voltage, the voltage stabilizing diode ZD1 is not conducted, so that the optocoupler U1 is turned off, and when the voltage of the first output live wire and the second output zero line is not beyond the set upper limit voltage, the voltage stabilizing diode ZD2 is also not conducted, and the optocoupler U2 is turned off; by selecting the zener diodes ZD1 and ZD2 of appropriate on-voltages, the upper limit voltage and the lower limit voltage can be controlled. The over-voltage and under-voltage trigger protection circuit 32 controls the on-off of the coil control circuit 21 by setting a switch circuit formed by resistors R5, R6 and R7 and triodes Q1, Q2 and Q3, specifically, when U1 is conducted, the switch circuit triggers Q1 to be turned off, Q2 to be turned on, and Q3 to be turned off, so that Q4 can be turned on, alternating current is normally turned on, and when U1 is turned off, the switch circuit triggers Q1 to be turned on, Q2 to be turned off, and Q4 to be turned off, and alternating current to be turned off, so that under-voltage protection is realized; similarly, when U2 is turned off, Q2 is turned on, Q3 is turned off, the alternating current is normally turned on, when the voltage is too high to cause U2 to be turned on, Q2 is turned off, Q3 is turned on, and therefore Q4 is turned off, the alternating current is turned off, and overvoltage protection is achieved. And when the voltage is recovered to be normal, the alternating current energy is automatically recovered to be normal. In addition, the input end of the optocoupler U1 may be connected in series with the light emitting diode LED1, the input end of the optocoupler U2 may be connected in series with the light emitting diode LED2, when the voltage is normal, the light emitting diode LED1 is turned on to emit light, when the voltage is under-voltage abnormal, the light emitting diode LED1 is turned off, when the voltage is over-voltage abnormal, the light emitting diode LED2 is turned on to emit light.

Further, the circuit protection module 3 further includes a residual current trigger protection circuit 33, the residual current trigger protection circuit 33 includes a transformer PT1 and a residual current trigger circuit, an induction coil of the transformer PT1 is disposed at the first output live wire L1 and the first output neutral wire N1 to detect the residual current, the transformer PT1 output is connected to the residual current trigger circuit, and the residual current trigger circuit adopts a triode switch circuit and outputs a triode switch circuit connected to the coil control circuit 21. The residual current trigger protection circuit 33 is used for detecting the residual current of the circuit, and when the residual current is too large, the transformer PT1 triggers the coil control circuit 21 to turn off through the residual current trigger circuit, thereby playing a role of protection. The residual current trigger circuit consists of a rectifier bridge DC2, resistors R16, R17 and R18, capacitors C6 and C7, triodes Q10, Q11 and Q12, a transformer PT1 senses residual current and outputs the residual current to the position between a base electrode and an emitter electrode of the triode Q12, when the residual current is overlarge, the DC2 triggers the Q12 to be conducted, so that the Q11 is triggered to be turned off, the Q10 is conducted, a collector electrode of the triode Q10 is connected to a base electrode of the Q6 of the coil control circuit 21, and when the Q10 is conducted, the Q6 is triggered to be turned off, so that the alternating current is turned off; the capacitors C6 and C7 can realize delay triggering by using charging time, and the induced current generated by PT1 can be shielded by using the delay triggering of the capacitors C6 and C7 when the load in the circuit is switched on or the inductive load in the circuit is switched off, so that the circuit has certain anti-interference capability.

Further, the circuit protection module 3 further includes an over-current overload trigger protection circuit 34, where the over-current overload trigger protection circuit 34 includes a transformer PT2 and an over-current overload trigger circuit, the induction coil of the transformer PT2 is disposed at the first output live wire to detect the total current of the circuit, the output of the transformer PT2 is connected to the over-current overload trigger circuit, and the over-current overload trigger circuit adopts a triode switch circuit and outputs a triode switch circuit connected to the coil control circuit 21. The overload triggering circuit can be composed of a rectifier bridge DC3, resistors R19, R20, R21 and R22, capacitors C8 and C9 and triodes Q13 and Q14, the transformer PT2 is used for detecting current on a first output fire wire and outputting the current to the rectifier bridge DC3, when a circuit is in short circuit, such as a fire zero wire short circuit or a fire ground wire short circuit, the PT2 can instantaneously generate larger induction voltage and output the current through the rectifier bridge DC3, the conduction of the Q13 or the Q14 is triggered, the collectors of the Q13 and the Q14 are both connected to the base of the Q6 of the coil control circuit 21, and the conduction of the Q13 or the Q14 can trigger the disconnection of the coil control circuit so as to realize power-off protection.

In a further embodiment, the environment monitoring trigger circuit 4 is further included, the environment monitoring trigger circuit 4 includes a monitoring sensor 41 and a switching circuit 42, the output of the monitoring sensor 41 is connected to the switching circuit 42 to control the on or off of the switching circuit 42, and the switching circuit 42 is connected between the power supply output live wire L and the power supply output ground wire PE-. The environment detection trigger circuit 4 can detect abnormal conditions in the environment, and can select a corresponding monitoring sensor 41 according to needs, such as a gas monitoring sensor for monitoring natural gas leakage or a smoke sensor for detecting smoke, when the abnormal conditions occur in the environment, the monitoring sensor 41 triggers the switch circuit 42 to be conducted, the switch circuit 42 is connected between the power supply output live wire L and the power supply output ground wire PE-, when the switch circuit 42 is conducted, the power supply output ground wire PE is enabled to carry leakage current, and the alternating current power-off protection is triggered through the leakage current detection module 31.

In addition, an end overload protection circuit 5 can be arranged on the end load according to the requirement, the end overload protection circuit 5 adopts a bimetallic thermal trigger element RT2, two normally conducted ends of the bimetallic thermal trigger element RT2 are connected to a power supply output live wire L in series, and an overheat trigger end of the bimetallic thermal trigger element RT2 is connected to a power supply output ground wire PE-. For example, when the low-load power distribution line is connected with a high-power load, the low-load power distribution line is overloaded, but the overload trigger protection circuit 34 is not triggered at this time, if the low-load power distribution line is used for a long time, the low-load power distribution line is overheated and has fire hazard; through setting up terminal overload protection circuit 5 on low bearing power's distribution line, when the overload appears, can make bimetallic strip thermosensitive trigger element RT2 turn on from the AC end under the normal condition and turn into ABC three terminal and switch on to make power supply output live wire and power supply output ground wire intercommunication, power supply output ground wire area leakage current, thereby trigger leakage current detection module 31 and carry out the power-off protection.

In addition, other abnormal conditions appearing at the load end lead to electrification of electric equipment, the corresponding circuit is arranged at the load end to lead current into the power supply output ground wire, so that the leakage current detection module is triggered to conduct power-off protection, for example, when abnormality occurs, such as virtual connection or disconnection of a zero line, the situation that the load electric equipment is electrified is caused, the rectifier diode D12, the transient diode ZD8 and the current limiting resistor R50 can be connected between the power supply output zero line N+ and the power supply output ground wire PE-at the load end, when virtual connection disconnection of the zero line occurs, or disconnection occurs at the zero line input by mains supply, the live wire is connected to the electric equipment of the load, so that the current is released to the power supply output ground wire through the rectifier diode D12, the transient diode and the current limiting resistor R50, and the leakage current detection module is triggered to conduct power-off protection. In addition, if a capacitive load or an inductive load is directly connected between the power supply output zero line and the power supply output ground line, detection and processing of leakage current by the power supply output ground line are affected, so that a series rectifier diode is required to be connected on the capacitive load or the inductive load in series to play a role of isolation, for example, in the drawing, the capacitive load C13 is connected with the rectifier diode D11 in series, and the inductive load L1 is connected with the rectifier diode D13 in series. Meanwhile, in order to protect the low-voltage direct current load connected between the power supply output zero line and the power supply output ground line, piezoresistors can be connected in parallel at two ends of the low-voltage direct current load, so that the protection of the low-voltage direct current load can be realized, for example, in the drawing, the piezoresistors VDR3 are connected in parallel at two ends of the load RL1, and the piezoresistors VDR4 are connected in parallel at two ends of the inductive load L1.

Of course, the above embodiments are only preferred embodiments of the present utility model, and the scope of the present utility model is not limited thereto, so that all equivalent modifications made in the principles of the present utility model are included in the scope of the present utility model.

Claims

1. Novel ground zero live wire dual supply circuit protection system, its characterized in that: the overload circuit breaker comprises an input live wire, an input zero wire, an overload circuit breaker, a direct current power supply module, a central control module and a circuit protection module, wherein the input live wire and the input zero wire are connected with the overload circuit breaker and then output a first output live wire and a first output zero wire; the central control module comprises a relay and a coil control circuit, and the circuit protection module comprises a plurality of trigger protection circuits of different types; the switch of the relay is connected with a first output live wire, the first output live wire is connected with the switch of the relay and then is used as a power supply output live wire, and a plurality of trigger protection circuits of the circuit protection module are respectively connected with a coil of the relay through a coil control circuit; and the power supply output zero line and the power supply output ground line supply power for the circuit protection module and the central control module.

2. The novel ground zero line double-power circuit protection system according to claim 1, wherein: the coil control circuit of the central control module adopts a triode switch circuit, and the trigger protection circuit controls the on-off of the triode switch circuit of the coil control circuit by controlling the base potential of the triode switch circuit of the coil control circuit so as to control the on-off of the coil of the relay.

3. The novel ground zero line double-power circuit protection system according to claim 2, wherein: the circuit protection module at least comprises a leakage current detection module, the leakage current detection module comprises a voltage clamping circuit and an optocoupler detection circuit, the voltage clamping circuit is connected between a power supply output ground wire and a first output zero line, two ends of the voltage clamping circuit are connected to the input end of the optocoupler detection circuit, and the output end of the optocoupler detection circuit is connected to the base electrode of the triode switch circuit of the coil control circuit and the base electrode potential of the triode switch circuit of the emitting electrode pair.

4. A novel ground zero line dual power circuit protection system according to claim 3, wherein: the direct-current power supply module is internally provided with a pulse width driving circuit and a switching tube circuit, the switching tube circuit is connected between the negative electrode of direct current and a power supply output ground wire, the power supply output live wire and the power supply output zero line are connected with the pulse width driving circuit, and the pulse width driving circuit outputs pulse switching signals with certain frequency and a duty ratio of not less than 90% to the control end of the switching tube circuit to control the on-off of the negative electrode of direct current and the power supply output ground wire.

5. The novel ground zero line double-power circuit protection system according to claim 4, wherein: the direct current power supply module is characterized in that a direct current control circuit is further arranged in the direct current power supply module, the direct current control circuit comprises a control trigger circuit and a switch control circuit, the control trigger circuit adopts a triode switch circuit, the switch control circuit adopts a triode interlocking switch circuit, the switch control circuit triggers the triode switch circuit of the control trigger circuit to be turned on or off through a triode for controlling the triode interlocking switch circuit to be turned on or off, and the on/off of the triode switch circuit of the control trigger circuit controls the electric potential of the control end of the switch circuit to realize the control on/off of the direct current power supply module.

6. A novel ground zero line dual power circuit protection system according to claim 3, wherein: the circuit protection module further comprises an overvoltage and undervoltage trigger protection circuit, the overvoltage and undervoltage trigger protection circuit is composed of two groups of optocoupler switch circuits, wherein the input end of a light-emitting source of one group of optocoupler switch circuits is connected with a voltage stabilizing diode ZD1 in series to serve as an undervoltage trigger circuit, and the input end of a light-emitting source of the other group of optocoupler switch circuits is connected with a voltage stabilizing diode ZD2 in series to serve as an overvoltage trigger circuit; and the under-voltage trigger circuit and the over-voltage trigger circuit are respectively connected with the triode switch circuit of the coil control circuit.

7. A novel ground zero line dual power circuit protection system according to claim 3, wherein: the circuit protection module further comprises a residual current trigger protection circuit, the residual current trigger protection circuit comprises a transformer PT1 and a residual current trigger circuit, an induction coil of the transformer PT1 is arranged at a first output live wire and a first output zero wire to detect residual current, the transformer PT1 is output and connected to the residual current trigger circuit, and the residual current trigger circuit adopts a triode switch circuit and is output and connected to a triode switch circuit of the coil control circuit.

8. A novel ground zero line dual power circuit protection system according to claim 3, wherein: the circuit protection module further comprises an overcurrent overload trigger protection circuit, the overcurrent overload trigger protection circuit comprises a transformer PT2 and an overcurrent overload trigger circuit, an induction coil of the transformer PT2 is arranged at a first output live wire to detect total current of the circuit, the output of the transformer PT2 is connected to the overcurrent overload trigger circuit, and the overcurrent overload trigger circuit adopts a triode switch circuit and is output to be connected to a triode switch circuit of the coil control circuit.

9. A novel ground zero line dual power circuit protection system according to claim 3, wherein: the environment monitoring trigger circuit comprises a monitoring sensor and a switch circuit, wherein the output of the monitoring sensor is connected to the switch circuit to control the on or off of the switch circuit, and the switch circuit is connected between a power supply output live wire and a power supply output ground wire.

10. A novel ground zero line dual power circuit protection system according to claim 3, wherein: the power supply circuit further comprises a tail end overload protection circuit, the tail end overload protection circuit adopts a bimetallic strip thermosensitive trigger element RT2, two normally conducted ends of the bimetallic strip thermosensitive trigger element RT2 are connected to a power supply output fire wire in series, and an overheat trigger end of the bimetallic strip thermosensitive trigger element RT2 is connected to a power supply output ground wire.

11. A novel ground zero line dual power circuit protection system according to claim 3, wherein: the power supply circuit further comprises a zero line detection circuit, wherein the zero line detection circuit is connected between a power supply output zero line and a power supply output ground line of a load end, and the zero line detection circuit is formed by connecting a rectifier diode D12, a transient diode ZD8 and a current limiting resistor R50 in series.

12. A novel ground zero line dual power circuit protection system according to claim 3, wherein: and the power supply output zero line and the power supply output ground line are connected with a low-voltage direct current load through the output of the rectifier diode.

13. A novel ground zero line dual power circuit protection system according to claim 3, wherein: and voltage dependent resistors are connected in parallel at two ends of the power supply output zero line and the power supply output ground wire and then output and are connected to a low-voltage direct current load.