CN104009739B - The on-off control method thereof of a kind of standby automatic power-off switch and device - Google Patents

Abstract

Standby automatic switching-off device of electric disclosed by the invention, the ingredient such as including switch, button, on-off control mnemon, D.C. regulated power supply, holding state judgement unit, after AC load standby a period of time being detected, it is possible to automatic control switch disconnects, cut off all power；When the switches are opened, press the button and can make switch connection；When the switch is closed, press the button, can make to switch off.Described switch, for needing to automatically cut off the long-term work electrical equipment at holding state or the occasion of equipment, may be mounted in socket, it is also possible to be connected to before electrical equipment.

Description

A method and device for on-off control of a standby automatic power-off switch

technical field

The invention relates to a switch technology, in particular to a method and device for on-off control of a standby automatic power-off switch.

Background technique

The electrical equipment consumes energy in standby during the standby period, and the unsafe problem of "standby" electrical equipment is brought about because the power supply is not completely turned off.

In 2000, the International Energy Agency launched the "1W Plan" energy-saving initiative to electrical product manufacturers and sellers in its member countries. my country has also issued relevant energy-saving certification for standby energy consumption, but many electrical equipment still fail to achieve zero power consumption, Even 1W power consumption standby.

Contents of the invention

The purpose of the present invention is to provide a switch device that can automatically cut off the power when the electric equipment is in the standby state without being controlled by a microcontroller, and can manually cut off the power when the electric equipment is in normal operation.

In order to achieve the above object, the present invention also provides an on-off control method of the standby automatic power-off switch.

A standby automatic power-off switch device, comprising a switch control memory unit, a switch closing drive unit, a switch power supply unit, a button power supply unit, a dual-way isolated power supply unit, a power-on detection unit, a trigger pulse shaping unit, and a standby state discrimination unit unit composition.

The switch control memory unit has an asynchronous setting input terminal, an asynchronous reset input terminal, an edge trigger pulse input terminal, and a switch control signal output terminal.

The switch closing drive unit is composed of a relay coil and a drive circuit; the input of the drive circuit is connected to the switch control signal output end of the switch control memory unit, and the output of the drive circuit is connected to the relay coil.

The switching power supply unit is composed of a switch and a first DC power supply voltage stabilizing circuit, and has an AC power input terminal, an AC power output terminal, and a first DC power supply output terminal; the first terminal and the second terminal of the switch are respectively connected to AC power input terminal, AC power output terminal; the input of the first DC power supply voltage stabilizing circuit is connected to the second terminal of the switch; the output of the first DC power supply voltage stabilizing circuit is the first DC power supply output terminal; the switch Normally open switch for the relay.

The button power supply unit is composed of a button and a second DC power supply voltage stabilizing circuit, and has an AC power supply input terminal and a second DC power supply output terminal; the first terminal of the button is connected to the AC power supply input terminal; the second DC power supply voltage stabilizing circuit The input of the button is connected to the second terminal of the button; the output of the second DC power supply voltage stabilizing circuit is the output terminal of the second DC power supply.

The dual-channel isolated power supply unit is composed of a diode dual-channel isolated power supply circuit, and has a first DC power supply input terminal, a second DC power supply input terminal and a DC working power supply output terminal; the first DC power supply input terminal is connected to a switching power supply The first DC power output terminal of the unit; the second DC power input terminal is connected to the second DC power output terminal of the button power supply unit; the DC working power output terminal outputs DC working power.

The input end of the power-on detection unit is connected to the DC working power supply, and the output is connected to the asynchronous setting input end of the switch control memory unit.

The input end of the trigger pulse shaping unit is connected to the second DC power supply, and the output is connected to the edge trigger pulse input end of the switch control memory unit.

The standby state judging unit is composed of a current inversion amplifier circuit, a standby threshold current given circuit, and a standby current comparison circuit; the two comparison signal input terminals of the standby current comparison circuit are connected to the output terminal of the current inversion amplifier circuit and the standby threshold value respectively. The output end of the current given circuit; the output end of the standby current comparison circuit is connected to the asynchronous reset input end of the switch control memory unit.

The switch control memory unit is a D flip-flop 74HC74.

The switch closing drive unit is composed of a relay coil, a first diode, a first resistor, and a triode; the two ends of the first resistor are respectively connected to the switch control signal output end of the switch control memory unit and the base of the triode; the relay coil It is the collector load of the triode; the first diode is connected in antiparallel to both ends of the relay coil, the cathode is connected to the DC working power supply, and the anode is connected to the collector of the triode.

The switching power supply unit is composed of a switch, a first capacitor, a first regulator tube, and a second resistor; the first terminal of the switch is connected to the AC phase line, and the second terminal is the output terminal of the AC power supply; the first capacitor, the second The resistor and the first voltage regulator tube form a capacitive step-down half-wave rectifier circuit; the first capacitor and the second resistor are connected in parallel, and then connected in series with the first voltage regulator tube to the output terminal of the AC power supply and the AC neutral line; the first voltage regulator tube The cathode of the first DC power supply is the output terminal, and the anode of the first regulator tube is connected to the common ground; the common ground is connected to the neutral line of the alternating current.

The button power supply unit is composed of a button, a second capacitor, a second voltage regulator tube, and a third resistor; the first terminal of the button is connected to the AC phase line, and the second capacitor, the third resistor, and the second voltage regulator tube form a capacitor Step-down half-wave rectification circuit; the second capacitor is connected in parallel with the third resistor, and then connected in series with the second voltage regulator tube to the second terminal of the button and the AC neutral line; the cathode of the second voltage regulator tube is the output of the second DC power supply terminal, and the anode of the second regulator tube is connected to the common ground.

The two-way isolated power supply unit is composed of a second diode, a third diode, and a third capacitor; the cathodes of the second diode and the third diode are connected to become the output terminal of a DC working power supply; the second diode The anode of the tube is connected to the output terminal of the first DC power supply; the anode of the third diode is connected to the output terminal of the second DC power supply; the third capacitor is connected in parallel between the output terminal of the DC working power supply and the common ground.

The power-on detection unit is composed of a fourth resistor and a fourth capacitor; after the fourth resistor and the fourth capacitor are connected in series, the other end of the fourth resistor is connected to the DC working power supply, and the other end of the fourth capacitor is connected to the common ground ; The series connection point of the fourth resistor and the fourth capacitor is connected to the asynchronous setting input terminal of the switch control memory unit.

The trigger pulse shaping unit is composed of a fourth diode, a fifth capacitor, and a fifth resistor; the anode of the fourth diode is connected to the second DC power supply, and the cathode is connected to the edge trigger pulse input terminal of the switch control memory unit; After the fifth capacitor is connected in parallel with the fifth resistor, both ends are respectively connected to the cathode of the fourth diode and the common ground.

The current inverting amplifying circuit is composed of a current transformer, an operational amplifier, a sixth resistor, a sixth capacitor, and a fifth diode; the non-inverting output terminal of the current transformer is connected to the inverting input terminal of the operational amplifier, and the current transformer The inverting output terminal of the op amp is connected to the non-inverting input terminal of the operational amplifier; the non-inverting input terminal of the operational amplifier is connected to the common ground; the sixth resistor and the sixth capacitor are connected in parallel to form the feedback branch of the current inverting amplifier circuit; the fifth diode anode connected to the inverting input terminal of the operational amplifier, and the cathode connected to the common ground; the standby current comparison circuit is composed of a comparator, a sixth diode, a seventh capacitor, and a seventh resistor; the standby threshold current given circuit is composed of The potentiometer is composed; the potentiometer output comparison voltage is connected to the inverting input terminal of the comparator; the non-inverting input terminal of the comparator is connected to the output terminal of the operational amplifier; the cathode of the sixth diode, one terminal of the seventh capacitor, and the terminal of the seventh resistor One end is connected to the output end of the standby reset signal, which is connected to the asynchronous reset input end of the flip-flop; the anode of the sixth diode is connected to the output end of the comparator; the other end of the seventh capacitor is connected to the DC working power supply.

A method for on-off control of a standby automatic power-off switch realized by the aforementioned device, comprising:

A. When the switch is turned off, press the button, the DC power supply is powered on, and a set signal is generated to set the switch control signal output by the switch control memory unit, and the switch is turned on;

B. When the switch is closed, press the button to generate an edge trigger pulse to reset the switch control signal output by the switch control memory unit, and the switch is turned off;

C. When the switch is closed, the AC load current is lower than the standby threshold current for a period of time, and a reset signal is generated to reset the switch control signal output by the switch control memory unit, and the switch is turned off;

D. When the switch is off and the button is not pressed, both the AC load and the AC power of the device are cut off.

The beneficial effects of the present invention are: (1) the function of automatic power-off in standby, after the load is in standby for a certain period of time, the switch will automatically cut off the power supply of the load to ensure the safety of electricity consumption; Or turn off the switch; (3) after the switch is turned off, the load and the AC power of the device are all cut off, realizing zero power consumption standby, and also ensuring the safety of the device itself.

Description of drawings

Fig. 1 is a structural schematic diagram of the present invention.

Fig. 2 is an embodiment of the switch control memory unit and the switch closing drive unit of the present invention.

Fig. 3 is an embodiment of a switching power supply unit, a button power supply unit, and a dual-way isolated power supply unit in the present invention.

FIG. 4 is an embodiment of a power-on detection unit of the present invention.

FIG. 5 is an embodiment of the trigger pulse shaping unit of the present invention.

FIG. 6 is an embodiment of the standby state judging unit of the present invention.

FIG. 7 is a second embodiment of the standby state judging unit of the present invention.

detailed description

As shown in Figure 1, a standby automatic power-off switch device is composed of a switch control memory unit 100, a switch closing drive unit 200, a switch power supply unit 300, a button power supply unit 400, a dual-way isolated power supply unit 500, and a power supply unit 500. The detection unit 600, the trigger pulse shaping unit 700, and the standby state determination unit 800 are composed.

The switch control memory unit 100 has an asynchronous setting input terminal, an asynchronous reset input terminal, an edge trigger pulse input terminal, and a switch control signal output terminal, which are used to realize the state control and memory of the switch; its function is that the output switch control signal is set When the position is set, the switch is closed; when the output switch control signal is reset, the switch is opened. The switch control signal is set and reset, which can be positive logic, setting corresponds to output high level, reset outputs low level; it can also be negative logic, setting corresponds to output low level, reset outputs high level; The asynchronous setting input terminal and the asynchronous reset input terminal can be positive logic, and the input is high-level active; they can also be negative logic, and the input is low-level active.

The switch closing drive unit 200 is made up of a relay coil and a drive circuit; the input of the drive circuit is connected to the switch control signal output end of the switch control memory unit 100, and the output of the drive circuit is connected to the relay coil; its function is that the switch control signal is set When the relay coil is energized, the switch is closed; when the switch control signal is reset, the relay coil is de-energized and the switch is opened.

An embodiment of the switch control memory unit 100 and the switch closing drive unit 200 is shown in FIG. 2 . The switch control memory unit 100 is composed of a trigger 101, and the trigger 101 is a D flip-flop; the switch closing drive unit 200 is composed of a relay coil 201, a first diode 202, a first resistor 203, and a triode 204; the switch control memory unit 100 The asynchronous set input terminal, asynchronous reset input terminal, edge trigger pulse input terminal, and switch control signal output terminal of the flip-flop 101 respectively correspond to the asynchronous set input terminal S, asynchronous reset input terminal R, rising edge trigger pulse input terminal CLK, The output terminal Q; the input terminal D of the trigger 101 is connected to the common ground; the two ends of the first resistor 203 are respectively connected to the output terminal Q of the trigger 101 and the base of the triode 204; the relay coil 201 is the collector load of the triode 204 ; The first diode 202 is a freewheeling diode, which is connected in antiparallel to both ends of the relay coil 201 .

When the trigger 101 is set, the output terminal Q is at a high level, the transistor 204 is saturated and turned on, and the relay coil 201 is energized; when the trigger 101 is reset, the output terminal Q is at a low level, the transistor 204 is cut off, and the relay coil 201 is de-energized .

The model of the flip-flop 101 is preferably a D flip-flop 74HC74, which is triggered by a rising edge, and the asynchronous set input S and the asynchronous reset input R are active at low level.

The type of flip-flop 101 can also choose D flip-flop CD4013, which is triggered by a rising edge, and the asynchronous set input S and the asynchronous reset input R are active at high level.

The flip-flop 101 can also choose counters and registers with similar functions.

The switching power supply unit 300 is composed of a switch and a first DC power supply voltage stabilizing circuit, and has an AC power input terminal, an AC power output terminal, and a first DC power output terminal; the first terminal and the second terminal of the switch are connected to the AC power supply respectively. Power supply input terminal, AC power supply output terminal; the input of the first DC power supply voltage stabilizing circuit is connected to the second terminal of the switch; the output of the first DC power supply voltage stabilizing circuit is the first DC power supply output terminal. The function of the switching power supply unit 300 is: when the switch is closed, it provides AC power to the AC load, and at the same time outputs an effective first DC power; when the switch is turned off, the AC load loses power, and the voltage of the first DC power is 0V.

The button power supply unit 400 is made up of a button and a second DC power supply voltage stabilizing circuit, and has an AC power supply input terminal and a second DC power supply output terminal; the first terminal of the button is connected to the AC power supply input terminal; the second DC power supply voltage stabilizing circuit The input is connected to the second terminal of the button; the output of the second DC power supply voltage stabilizing circuit is the output terminal of the second DC power supply. The function of the button power supply unit 400 is to output a valid second DC power supply when the button is closed; when the button is turned off, the voltage of the second DC power supply is 0V.

The dual-channel isolated power supply unit 500 is composed of a diode dual-channel isolated power supply circuit, and has a first DC power supply input terminal, a second DC power supply input terminal and a DC working power supply output terminal; the first DC power supply input terminal is connected to the switching power supply unit The first DC power supply output terminal of 300; the second DC power supply input terminal is connected to the second DC power supply output terminal of the button power supply unit 400; the DC working power output terminal directly outputs DC working power, or, in the first DC power supply When the ripples of the power supply and the second DC power supply are relatively large, the output terminal of the DC working power supply passes through the capacitor filter circuit and then outputs the DC working power supply. The function of the dual-channel isolated power supply unit 500 is: as long as one of the input first DC power supply and the second DC power supply is effective, then an effective DC working power supply is output; when the input first DC power supply and the second DC power supply When the voltages are all 0V, the output DC working power is 0V.

The switching power supply unit 300 , the button power supply unit 400 , and the dual-channel isolated power supply unit 500 together form a DC stabilized power supply, an embodiment of which is shown in FIG. 3 .

The switching power supply unit 300 is composed of a switch 301, a first capacitor 302, a first regulator tube 304, and a second resistor 303; the first terminal of the switch 301 is connected to the AC phase line L, and the second terminal is the AC power output terminal L1; The first capacitor 302, the second resistor 303, and the first regulator tube 304 form a capacitive step-down half-wave rectifier circuit; the first capacitor 302 is connected in parallel with the second resistor 303, and then connected in series with the first regulator tube 304 to the AC power supply The output terminal L1 and the AC neutral line N; the cathode of the first voltage regulator tube 304 is the output terminal of the first DC power supply VCC1, and the anode of the first voltage regulator tube 304 is connected to the common ground; the common ground is connected to the AC neutral line N.

The switch 301 is a normally open switch of the relay, and the switch 301 and the relay coil 201 are components in the same relay. When the relay coil 201 is energized, the switch 301 is closed; when the relay coil 201 is de-energized, the switch 301 is opened.

The button power supply unit 400 is composed of a button 401, a second capacitor 402, a second regulator tube 404, and a third resistor 403; the first terminal of the button 401 is connected to the AC phase line L, the second capacitor 402, the third resistor 403, and the third resistor 403. Two voltage regulator tubes 404 form a capacitive step-down half-wave rectifier circuit; the second capacitor 402 is connected in parallel with the third resistor 403, and then connected in series with the second voltage regulator tube 404 to the second terminal of the button 401 and the AC neutral line N; The cathode of the second voltage regulator tube 404 is the output terminal of the second DC power supply VCC2, and the anode of the second voltage regulator tube 404 is connected to the common ground.

The switching power supply unit 300 and the button power supply unit 400 can also select a capacitor step-down full-wave rectification circuit at the same time; at this time, the common ground should be connected to the DC negative output terminal of the rectifier bridge. The switch power supply unit 300 and the button power supply unit 400 can also select a transformer isolation step-down rectification circuit simultaneously or separately.

The dual-channel isolated power supply unit 500 is composed of a second diode 501, a third diode 502, and a third capacitor 503; the cathodes of the second diode 501 and the third diode 502 are connected to form the output terminal of the DC power supply VCC ; The anode of the second diode 501 is connected to the output terminal of the first DC power supply VCC1; the anode of the third diode 502 is connected to the output terminal of the second DC power supply VCC2; the third capacitor 503 is connected in parallel between the output terminal of the DC working power supply VCC and the common between the ground.

The input terminal of the power-on detection unit 600 is connected to the DC working power supply, and the output is the set signal generated by power-on, which is connected to the asynchronous setting input terminal of the switch control memory unit 100; its function is, only when the DC working power supply is powered on When , a set signal is generated, so that the switch control signal output by the switch control memory unit 100 is set, and the switch is closed.

The embodiment of the power-on detection unit 600 is shown in FIG. 4, which is composed of a fourth resistor 601 and a fourth capacitor 602; after the fourth resistor 601 and the fourth capacitor 602 are connected in series, the other end of the fourth resistor 601 is connected to a DC working The power supply VCC, the other end of the fourth capacitor 602 is connected to the common ground; the series connection point of the fourth resistor 601 and the fourth capacitor 602 outputs an asynchronous set signal US, which is connected to the asynchronous set input terminal S of the flip-flop 101, power-on At this time, an effective low-level set signal is output, so that the switch control signal UK output by the switch control memory unit 100 is set, and the switch is closed.

If it is necessary to output an active-high set signal when powering on, the positions of the fourth resistor 601 and the fourth capacitor 602 in FIG. 4 can be exchanged.

The input terminal of the trigger pulse shaping unit 700 is connected to the second DC power supply, and the output is an edge-triggered pulse signal, which is connected to the edge-triggered pulse input terminal of the switch control memory unit 100; its function is to output an edge-triggered pulse only when the button is pressed The effective edge of the signal enables the switch to control the output of the memory unit 100 . Therefore, when the second DC power supply is very stable and the ripple is small, the second DC power supply can be directly used as an edge trigger pulse signal; the ripple of the second DC power supply is large, especially when the second DC power supply is a half-wave pulsating DC power supply, The trigger pulse shaping unit 700 needs to isolate the second DC power supply before performing filtering.

The embodiment of the trigger pulse shaping unit 700 is shown in FIG. 5, which is composed of a fourth diode 701, a fifth capacitor 702, and a fifth resistor 703; the anode of the fourth diode 701 is connected to the second DC power supply VCC2, and the cathode outputs The edge trigger pulse CP is connected to the rising edge trigger pulse input terminal CLK of the flip-flop 101; after the fifth capacitor 702 is connected in parallel with the fifth resistor 703, both ends are respectively connected to the cathode of the fourth diode 701 and the common ground. Its working principle is that when the switch 301 is closed and the button is released, both the asynchronous set input terminal S and the asynchronous reset input terminal R of the flip-flop 101 input a high level and are in a hold state; A rising edge is input to the trigger pulse input terminal CLK, which triggers the output terminal Q=D=0, resets the switch control signal UK, and turns off the switch.

Standby state judging unit 800 is made up of current inversion amplifier circuit, standby threshold current given circuit, standby current comparison circuit; two comparison signal input ends of standby current comparison circuit are connected to current inversion amplifier circuit output end, standby threshold current respectively. The output terminal of the given circuit; the output terminal of the standby current comparison circuit outputs a standby reset signal, which is connected to the asynchronous reset input terminal of the switch control memory unit 100; its function is to detect the AC load current, and when it is continuously less than the standby threshold current reaches a certain After a period of time, confirm that the AC load enters the standby state, output a reset signal, reset the switch control signal output by the switch control memory unit 100, and turn off the switch.

An embodiment of the standby state judging unit 800 is shown in FIG. 6 .

The current inverting amplifying circuit is composed of a current transformer 801, an operational amplifier 802, a sixth resistor 803, a sixth capacitor 804, and a fifth diode 805; the non-inverting output terminal "+" of the current transformer 801 is connected to the The inverting input terminal, the inverting output terminal "-" of the current transformer 801 is connected to the non-inverting input terminal of the operational amplifier 802; the non-inverting input terminal of the operational amplifier 802 is connected to the common ground; the sixth resistor 803 and the sixth capacitor 804 are connected in parallel to form The feedback branch of the current inverting amplifier circuit; the anode of the fifth diode 805 is connected to the inverting input terminal of the operational amplifier 802, and the cathode is connected to the common ground. The operational amplifier 502 is a single-supply operational amplifier with rail-to-rail input/output.

The standby current comparison circuit is composed of a comparator 806, the sixth diode 808, the seventh capacitor 809, and the seventh resistor 810; the standby threshold current given circuit is composed of a potentiometer 807; the potentiometer 807 outputs a comparison voltage UF1 and is connected to the comparator The inverting input terminal of 806; the non-inverting input terminal of comparator 806 is connected to the output terminal of operational amplifier 802; the cathode of the sixth diode 808, one end of the seventh capacitor 809, and one end of the seventh resistor 810 are connected as the standby reset signal UR The output end is connected to the asynchronous reset input end R of the flip-flop 101; the anode of the sixth diode 808 is connected to the output end of the comparator 806; the other end of the seventh capacitor 809 is connected to the DC power supply VCC; the seventh resistor 810 Connect the other end to common ground.

The AC load shown in FIG. 6 is a device or electrical appliance that needs to automatically cut off the power supply when it is in standby, and its two ends are respectively connected to the AC power output terminal L1 and the AC power neutral line N.

The current transformer 801 is arranged on the phase line connecting the output end L1 of the AC power supply to the AC load, and is used to detect the magnitude of the current flowing through the AC load. The current transformer can be a finished product with a suitable detection range, or an electromagnetic induction coil can be wound by itself.

The working principle of the circuit shown in FIG. 6 is that the current transformer 801 outputs the negative half-wave of the current signal, and its output current flows through the sixth resistor 803, and the current detection signal U0 at the output terminal of the operational amplifier 802 is proportional to the AC load current; The current transformer 801 outputs the positive half wave of the current signal, and its output current forms a loop through the fifth diode 805 , and the current detection signal U0 at the output terminal of the operational amplifier 802 is 0V. The seventh resistor 810 charges the seventh capacitor 809, and the charging time is long; when the AC load current is large, the variation of U0 is large, as long as its peak voltage is partly higher than the comparison voltage UF1, the comparator 806 outputs a high level Pulse, quickly discharges the seventh capacitor 809 through the sixth diode 808, and the output standby reset signal UR is high level; only the AC load is in the standby state for a period of time, that is, the current is small and lasts for a period of time, and the AC load enters the standby state state, for example, the duration can be 15 seconds, 30 seconds, or more than 1 minute, the peak voltage of U0 is also lower than the comparison voltage UF1 for the same period of time, and the comparator 806 continues to output low level. The six diodes 808 are continuously cut off, the seventh capacitor 809 is charged by the seventh resistor 810, and the potential of the output standby reset signal UR continues to decrease until it becomes low level, so that the switch control signal output by the memory unit 100 UK is reset and the control switch is disconnected.

Changing the charging time constant of the seventh resistor 810 to the seventh capacitor 809 can change the length of time that the AC load is in the standby state.

Adjusting the potentiometer 807 to change the magnitude of the comparison voltage UF1 can change the magnitude of the standby threshold current. If it is necessary to limit the adjustment range of the standby threshold current, a resistor can be connected in series with both ends of the potentiometer 807 .

If the output standby reset signal UR needs to be active at a high level, the component connection method of the standby current comparison circuit shown in FIG. 6 can be changed. The second embodiment is shown in FIG. 7. Compared with FIG. 6, the positions of the seventh capacitor 809 and the seventh resistor 810 are interchanged, the cathode and anode of the sixth diode 808 are interchanged, and the voltage signal U0 and the comparison voltage UF1 are respectively Connect to the inverting input and the non-inverting input of the comparator 806.

When the switch is disconnected and the button is not pressed, the AC load and the AC power of the device are cut off, and the switch is closed only when the button is pressed again.

The above description is only an embodiment of the present invention, and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of the claims of the present invention.

Claims (8)

1. a standby automatic switching-off device of electric, it is characterised in that:

By on-off control mnemon, switch Guan Bi driver element, switch power supply unit, button power supply unit, double Road insulating power supply unit, power supply electrifying detector unit, triggering pulse shaping unit, holding state judgement unit composition；

Described on-off control mnemon have asynchronous set input, asynchronous reset inputs, edging trigger pulse input end, Switch controlling signal outfan；

Described switch Guan Bi driver element is made up of relay coil and drive circuit；The input of drive circuit is connected to switch control The switch controlling signal outfan of mnemon processed, the output of drive circuit is connected to relay coil；

Described switch power supply unit by switching, the first DC power voltage stabilizing circuit forms, and has ac power input end, friendship Stream power output end, the first DC power output end；The first terminal of switch, the second terminal are respectively connecting to alternating current power supply input End, ac power output；The input of the first DC power voltage stabilizing circuit is connected to the second terminal of switch；First DC source Mu balanced circuit is output as the first DC power output end；Described switch is the normal open switch of relay；

Described button power supply unit is made up of button, the second DC power voltage stabilizing circuit, have ac power input end, Two DC power output ends；The first terminal of button is connected to ac power input end；Second DC power voltage stabilizing circuit defeated Enter to be connected to the second terminal of button；Second DC power voltage stabilizing circuit is output as the second DC power output end；

Described dual path isolation power subsystem is made up of diode dual path isolation power supply circuits, have the first DC supply input, Second DC supply input and DC supply outfan；First DC supply input is connected to switch power supply list First DC power output end of unit；Second DC supply input is connected to the second DC source of button power supply unit Outfan；DC supply outfan output DC supply；

The input of described power supply electrifying detector unit is connected to DC supply, and output is connected to on-off control mnemon Asynchronous set input；

Described triggering pulse shaping unit input is connected to the second DC source, and output is connected to on-off control mnemon Edging trigger pulse input end；

Described holding state judgement unit is compared by anti-phase amplifying circuit, standby threshold given value of current circuit, standby current Circuit forms；Two comparison signal inputs of standby current comparison circuit are respectively connecting to the output of anti-phase amplifying circuit End, standby threshold given value of current circuit output end；Standby current comparison circuit outfan is connected to on-off control mnemon Asynchronous reset inputs；

Described switch power supply unit by switching, the first electric capacity, the first stabilivolt, the second resistance form；First end of switch Son is connected to alternating current phase line, and the second terminal is ac power output；First electric capacity, the second resistance, the first stabilivolt composition Capacitance decompression half-wave rectifying circuit；First electric capacity and the second resistor coupled in parallel, then it is connected to alternating current after connecting with the first stabilivolt Source output terminal and alternating current zero line；The negative electrode of the first stabilivolt is the first DC power output end, and the anode of the first stabilivolt is even It is connected to publicly；It is connected to alternating current zero line publicly；

Described button power supply unit is made up of button, the second electric capacity, the second stabilivolt, the 3rd resistance；First end of button Son is connected to alternating current phase line, the second electric capacity, the 3rd resistance, the second stabilivolt composition capacitance decompression half-wave rectifying circuit；Second Electric capacity and the 3rd resistor coupled in parallel, then it is connected to the second terminal and the alternating current zero line of button with the second stabilivolt after connecting；Second The negative electrode of stabilivolt is the second DC power output end, and the anode of the second stabilivolt is connected to publicly.

Standby automatic switching-off device of electric the most as claimed in claim 1, it is characterised in that described on-off control mnemon is D type flip flop 74HC74.

Standby automatic switching-off device of electric the most as claimed in claim 1, it is characterised in that described switch Guan Bi driver element by Relay coil, the first diode, the first resistance, audion form；The two ends of the first resistance are respectively connecting to on-off control note Recall switch controlling signal outfan and the base stage of audion of unit；Relay coil is the collector load of audion；First Diode reverse is connected in parallel on the two ends of relay coil, and negative electrode is connected to DC supply, and anode is connected to the collection of audion Electrode.

Standby automatic switching-off device of electric the most as claimed in claim 1, it is characterised in that described dual path isolation power subsystem by Second diode, the 3rd diode, the 3rd electric capacity composition；Second diode, the negative electrode connection of the 3rd diode become direct current work Make power output end；Second diode anode is connected to the first DC power output end；3rd diode anode is connected to second DC power output end；3rd electric capacity be connected in parallel on DC supply outfan and publicly between.

Standby automatic switching-off device of electric the most as claimed in claim 1, it is characterised in that described power supply electrifying detector unit by 4th resistance, the 4th electric capacity composition；After 4th resistance and the connection of the 4th capacitances in series, the other end of the 4th resistance is connected to directly Stream working power, the other end of the 4th electric capacity is connected to publicly；The series connection tie-point of the 4th resistance and the 4th electric capacity connects Asynchronous set input to on-off control mnemon.

Standby automatic switching-off device of electric the most as claimed in claim 1, it is characterised in that described triggering pulse shaping unit by 4th diode, the 5th electric capacity, the 5th resistance composition；The anode of the 4th diode is connected to the second DC source, and negative electrode connects Edging trigger pulse input end to on-off control mnemon；After 5th electric capacity and the 5th resistor coupled in parallel, two ends connect respectively To the 4th diode cathode and publicly.

Standby automatic switching-off device of electric the most as claimed in claim 1, it is characterised in that described anti-phase amplifying circuit by Current transformer, amplifier, the 6th resistance, the 6th electric capacity, the 5th diode composition；The in-phase output end of current transformer is connected to The inverting input of amplifier, the reversed-phase output of current transformer is connected to the in-phase input end of amplifier；The homophase input of amplifier End is connected to publicly；6th resistance, the 6th electric capacity compose in parallel the feedback branch of anti-phase amplifying circuit；5th diode Anode is connected to the inverting input of amplifier, and negative electrode is connected to publicly；Described standby current comparison circuit by comparator, the 6th Diode, the 7th electric capacity, the 7th resistance composition；Described standby threshold given value of current circuit is made up of potentiometer；Potentiometer exports Relatively voltage is connected to the inverting input of comparator；The in-phase input end of comparator is connected to the outfan of amplifier；Six or two Pole tube cathode, one end of the 7th electric capacity, a client link of the 7th resistance are standby reset signal outfan, are connected to trigger Asynchronous reset inputs；6th diode anode is connected to the outfan of comparator；The other end of the 7th electric capacity is connected to directly Stream working power.

8. an on-off control method thereof for standby automatic power-off switch, including utilizing treating according to any one of claim 1 to 7 Machine automatic switching-off device of electric, it is characterised in that:

A, when switching off, pressing the button, DC supply powers on, and produces set signal and makes on-off control mnemon export Switch controlling signal set, switch connection；

When B, switch Guan Bi, press the button, produce the on-off control letter that edging trigger pulse makes on-off control mnemon export Number reset, switch off；

When C, switch Guan Bi, AC load electric current continues for some time less than standby threshold electric current, produces reset signal and makes switch The switch controlling signal controlling mnemon output resets, and switches off；

D, switching off and time button does not presses, the alternating current power supply of AC load and described device is the most cut-off.