CN1728490A - High voltage protective device for input of AC electrical source - Google Patents
High voltage protective device for input of AC electrical source Download PDFInfo
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- CN1728490A CN1728490A CN 200410070673 CN200410070673A CN1728490A CN 1728490 A CN1728490 A CN 1728490A CN 200410070673 CN200410070673 CN 200410070673 CN 200410070673 A CN200410070673 A CN 200410070673A CN 1728490 A CN1728490 A CN 1728490A
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Abstract
The high voltage protective device includes high voltage protective main circuit, control circuit of main relay, control circuit of auxiliary relay, circuit for detecting AC input voltage, and power supply circuit of auxiliary power supply. Connected to main loop, the circuit for detecting AC input voltage outputs detected signal of AC input voltage to control circuit of main relay and control circuit of auxiliary relay. The control circuit of main relay controls on/off of main relay in high voltage protective main circuit. The control circuit of auxiliary relay controls on/off of auxiliary relay in high voltage protective main circuit. AC input in high voltage protective main circuit supplies power for electrolytic capacitor through rectification of rectifying bridge. The power supply circuit of auxiliary power supply supplies DC input source for the auxiliary power. Advantages are: low cost, high protection speed, and high reliability.
Description
Technical field
The present invention relates to field of power supplies, relate in particular to high voltage protective device for input of AC electrical source.
Background technology
Along with the high speed development of industry, also increase day by day for the requirement of electric power supply system.Concrete needs according to types of applications; power supply is formed the electric power system of various capacity usually load is powered; as using in the power supply in communication; the interchange input of power supply directly is connected with AC network by A.C. contactor or air switch; when AC power input produces long-term high pressure or three-phase and falls zero line; though power supply interchange input this moment overvoltage protection does not have power output; but its input circuit does not still break away from electrical network; if power supply or load system are not taken measures; will damage the electrochemical capacitor (normally 450V/470 μ F) of rectifier bridge back output filtering; cause the electrochemical capacitor explosion; even cause that power supply is on fire, cause the work of load system to interrupt.
Because the problem of cost or technology, most of power-supply systems are not taked any safeguard measure to the input high pressure, and more existing power protection measures at present mainly comprise following two kinds:
A kind of is system protection method, when detecting the too high or three-phase of AC-input voltage and fall zero line, utilizes the A.C. contactor of system to disconnect and exchanges input, reaches the purpose of protection power supply.The high voltage protection method of this system level need increase by one and overlap power supply and testing circuit and the control circuit that forever is connected with electrical network, and not only cost increases greatly, and has increased the extra power consumption of system.Another is a power supply autoprotection method (as shown in Figure 1); R shown in Fig. 1 is semistor (positive temperature coefficient thermistor); semistor R is sealed in the startup buffer circuit; after the operate as normal; semistor R is by relay short circuit in parallel with it; when being in high pressure conditions, system main power circuit is disconnected with one or two relay; semistor R is inserted; utilize semistor R adstante febre to be the characteristics of high-impedance state; limit the electric current and the pressure drop of main power circuit, thereby realize overvoltage protection filter capacitor after the main power circuit rectification.Though this method cost is not very high relatively; but the shortcoming of this method also clearly; because generating heat to the high resistant state of semistor R needs the long period; thereby cause protection speed to reach the several seconds, during this period of time be easy to take place the electrochemical capacitor damage of rectifier bridge back to tens of seconds.And the protective value of this method is current related with the size and the overvoltage protection back loading of input overvoltage; if overvoltage or load current are big more; the electric current that then flows through semistor R when overvoltage is protected is also bigger; semistor R heating is also very fast; make that protection speed is very fast; otherwise protection speed is slower.In addition when overvoltage is protected; main loop of power circuit still is connected on the AC network; relay is in the mode of operation of batch (-type) disconnection and adhesive; voltage maintains on the crest voltage that exchanges the input overvoltage and under the electrochemical capacitor overvoltage protection voltage on the electrochemical capacitor of rectifier bridge back; voltage stress on the electrochemical capacitor is higher at this moment, is unfavorable for work reliably and with long-term.
Summary of the invention
Technical problem to be solved by this invention is to overcome that prior art exists that cost is too high, protection speed is slow, load current is relevant and shortcoming that can't long-term stable operation, in the hope of propose a kind of low cost, at a high speed, high voltage protective device for input of AC electrical source that reliability is high.
For achieving the above object; the present invention has constructed a kind of high voltage protective device for input of AC electrical source; comprise auxiliary relay control circuit, AC-input voltage testing circuit, it is characterized in that, also comprise high voltage protection main circuit, main relay control circuit and accessory power supply power supply circuits.
Described high voltage protection main circuit further comprises rectifier bridge, electrochemical capacitor, main relay and auxiliary relay;
Described AC-input voltage testing circuit one end is connected with live wire L, the zero line N line of major loop, respectively to described main relay control circuit and auxiliary relay control circuit output AC input voltage detection signal; Described main relay control circuit is controlled the adhesive or the disconnection of main relay in the described high voltage protection main circuit according to the AC-input voltage detection signal; Described auxiliary relay control circuit is controlled the adhesive or the disconnection of auxiliary relay in the described high voltage protection main circuit according to the AC-input voltage detection signal; The interchange of described high voltage protection main circuit input after the rectifier bridge rectification to the electrochemical capacitor power supply, for the conversion of described accessory power supply power supply circuits and back provides a DC power supply; Described accessory power supply power supply circuits provide direct-current input power supplying to accessory power supply, and the interchange by major loop simultaneously inputs to the accessory power supply power supply.
Device of the present invention is without semistor; power supply itself can cut off immediately, fully main telegram in reply road according to the AC-input voltage situation of power supply; its protection response time is several milliseconds; realize the circuit of power supply input high voltage protection, thus the integrity problem when solving the input of power supply high pressure.Adopt device of the present invention,, have quick, simple, reliable, low cost and other advantages by detecting the interchange input high voltage protection that AC-input voltage realizes power supply.
Description of drawings
Fig. 1 utilizes semistor high pressure protector structure chart in the prior art.
Fig. 2 is a high voltage protective device for input of AC electrical source structure chart of the present invention.
Fig. 3 is a device mesohigh protection main circuit diagram of the present invention.
Fig. 4 is auxiliary relay K2 control circuit figure in the device of the present invention.
Fig. 5 is main relay K1 control circuit figure in the device of the present invention.
Fig. 6 is AC-input voltage testing circuit figure in the device of the present invention.
Fig. 7 is an accessory power supply power supply circuit in the device of the present invention.
Embodiment
Further describe ac high-voltage protective device of the present invention below in conjunction with the drawings and specific embodiments:
Fig. 2 is the structured flowchart of high voltage protective device for input of AC electrical source of the present invention.Comprise high voltage protection main circuit, main relay control circuit, auxiliary relay control circuit, AC-input voltage testing circuit, the accessory power supply power supply circuits.
High voltage protection main circuit: utilize control to seal in the disconnection of two relays in the major loop and the problem that adhesive solves high voltage protection.Have only the AC-input voltage of working as for just often, the just adhesive of auxiliary relay and main relay, otherwise, all disconnect immediately; The first, under the normal working voltage, the adhesive of auxiliary relay elder generation, charge to electrochemical capacitor by fixed resistance, the charging current of this moment is limited in the preset range, main relay delay time when electrochemical capacitor on voltage and AC-input voltage peak value near the time ability adhesive, impulse current is very little at this moment; The second, when AC-input voltage became high pressure during operate as normal, main relay and auxiliary relay all disconnected immediately, realized the overvoltage of major loop is protected fast; The 3rd, when being input as high pressure, interchange inserts power supply again, and auxiliary relay and main relay all keep disconnecting, and high pressure can not be scurried into major loop;
Main relay control circuit: control the adhesive or the disconnection of main relay according to the AC-input voltage detection signal: main relay disconnects when the AC-input voltage detection signal is overvoltage, simultaneously with time-delay reset; The AC-input voltage main relay adhesive of just delaying time is just often guaranteed whenever exchanging input just often, all first adhesive of auxiliary relay, and attract current is excessive when avoiding main relay because of first adhesive causes damage.
Auxiliary relay control circuit: also be adhesive or the disconnection of controlling auxiliary relay according to the AC-input voltage detection signal: when the AC-input voltage overvoltage, auxiliary relay disconnects; When AC-input voltage just often, the auxiliary relay adhesive.
Accessory power supply power supply circuits: provide direct-current input power supplying by rectifier diode, anti-surge resistance and electric capacity to accessory power supply, power to accessory power supply by a diode by the output electrolysis of major loop simultaneously; The first, during power initiation, provide direct-current input power supplying to accessory power supply by rectifier diode, anti-surge resistance and electric capacity; Second, when AC-input voltage normal, after the main relay adhesive, by the power supply of diode, and rectifier diode, anti-surge resistance flow through electric current to accessory power supply hardly by the output electrolysis, for the circuit that has power factor correction (power factor correction) to boost, because of the voltage on the electrochemical capacitor is higher than the peak value of AC-input voltage, rectifier diode is anti-inclined to one side, so rectifier diode, anti-surge resistance do not flow through electric current, therefore, do not increase extra power consumption during operate as normal.The 3rd, during overvoltage protection, the voltage in the output electrolysis drops to zero, and accessory power supply is fully through rectifier diode, anti-surge resistance and capacitances to supply power.The desirable very low capacity of electric capacity that is used for accessory power supply power supply guarantees that the reliable adhesive of relay gets final product when only needing in the AC-input voltage normal range (NR) input minimum voltage, but voltage is higher during because of overvoltage, need select the higher electric capacity of operating voltage.
Fig. 3～7th, specific embodiments of the invention; Fig. 3 is a high voltage protection main circuit schematic diagram of the present invention; to the electrochemical capacitor power supply, for the conversion of back provides a DC power supply, this electrochemical capacitor is exactly that this circuit is claimed after the rectifier bridge rectification in the interchange of high voltage protection main circuit input.It is implemented as follows: the contact of the contact of main relay K1 and auxiliary relay K2 links to each other with the live wire L that exchanges of input, another contact of auxiliary relay K2 links to each other with an end of resistance R 12, the other end of resistance R 12, another contact of main relay K1 links to each other with 1 pin of rectifier bridge VD10,3 pin of rectifier bridge VD10 with exchange zero line N and link to each other, 2 pin of rectifier bridge VD10, the positive pole of electrochemical capacitor C4 links to each other with voltage signal POWER on the electrochemical capacitor, 4 pin of rectifier bridge VD10, the negative pole of electrochemical capacitor C4 links to each other with control ground GND, one end of resistance R 13 links to each other with power supply VCC with an end of resistance R 14, the other end of resistance R 13, one end of main relay K1 line bag links to each other with the negative electrode of rectifier VD6, the other end of main relay K1 line bag, the anode of rectifier VD6 links to each other with main relay control signal RELAY-K1, one end of the other end of resistance R 14 and auxiliary relay K2 line bag links to each other with the negative electrode of rectifier VD7, the other end of auxiliary relay K2 line bag, the anode of rectifier VD7 links to each other with auxiliary relay control signal RELAY-K2.
Fig. 4 is an auxiliary relay K2 control circuit schematic diagram of the present invention, and the control signal RELAY-K2 that sends adhesive of a control auxiliary relay or disconnection after the auxiliary relay control circuit is handled the AC-input voltage detection signal AC-H of input gives the high voltage protection main circuit.It is implemented as follows: an end of resistance R 2 links to each other with power supply VCC, one end of the other end of resistance R 2, resistance R 4 links to each other with the anode of VD3, the negative electrode of VD3 links to each other with AC-input voltage detection signal AC-H, one end of the other end of resistance R 4, resistance R 3 links to each other with the base stage of triode VT1, the emitter of the other end of resistance R 3, triode VT1 links to each other with control ground GND, the collector electrode of triode VT1 links to each other with the control signal RELAY-K2 of auxiliary relay, and the control signal RELAY-K2 of auxiliary relay outputs to the high voltage protection main circuit.
Fig. 5 is a main relay K1 control circuit schematic diagram of the present invention, and the control signal RELAY-K1 that sends adhesive of a control main relay or disconnection after the main relay control circuit is handled the AC-input voltage detection signal AC-H of input gives the high voltage protection main circuit.It is implemented as follows: an end of resistance R 11, the negative electrode of diode VD4, the end of R5 links to each other with power supply VCC with 8 pin of amplifier D1A, the other end of resistance R 11, the anode of diode VD5, the anode of diode VD4, one end of resistance R 6, one end of capacitor C 2, one end of resistance R 8 links to each other with 3 pin of amplifier D1A, the negative electrode of diode VD5 with exchange overvoltage detection signal AC-H and link to each other, the other end of resistance R 5, one end of resistance R 9 links to each other with 2 pin of amplifier D1A, one end of resistance R 7, the other end of resistance R 8, the other end of resistance R 9,4 pin of amplifier D1A, the emitter of triode VT2 links to each other with control ground GND, the other end of R6,1 pin of amplifier D1A links to each other with the end of R10, the other end of R10, the other end of R7 links to each other with the base stage of triode VT2, the collector electrode of triode VT2 links to each other with the control signal RELAY-K1 of main relay K1, and the control signal RELAY-K1 of main relay K1 outputs to the high voltage protection main circuit.
Fig. 6 is an AC-input voltage testing circuit schematic diagram of the present invention, interchange is imported and is obtained a voltage signal with the AC-input voltage linear change after the circuit dividing potential drop after testing, the reference signal of this signal and setting compares, and exports an AC-input voltage detection signal AC-H to main relay control circuit and auxiliary relay control circuit.It is implemented as follows: the anode of diode VD9 links to each other with the live wire L that exchanges input, the anode of diode VD8 with exchange zero line N and link to each other, the negative electrode of diode VD9, the negative electrode of diode VD8 links to each other with an end of resistance R 15, the other end of resistance R 15, one end of resistance R 19, one end of resistance R 16 links to each other with an end of capacitor C 3, the other end of resistance R 19, the other end of capacitor C 3 links to each other with control ground GND, the other end of resistance R 16 links to each other with 6 pin of amplifier D1B, one end of resistance R 17 links to each other with voltage reference signal VREF, the other end of resistance R 17, one end of resistance R 18 links to each other with 5 pin of amplifier D1B, the other end of resistance R 18,7 pin of amplifier D1B link to each other with AC-input voltage detection signal AC-H, and AC-input voltage detection signal AC-H outputs to main relay control circuit and auxiliary relay control circuit.
Fig. 7 is an accessory power supply power supply circuits schematic diagram of the present invention, and the accessory power supply power supply circuits provide the direct current input for accessory power supply.It is implemented as follows: an end of resistance R 1 links to each other with the live wire L that exchanges input, the other end of resistance R 1 links to each other with the anode of diode VD1, the anode of diode VD2 links to each other with voltage signal POWER on the output electrochemical capacitor C4, one end of the negative electrode of the negative electrode of diode VD1, diode VD2, capacitor C 1 links to each other with accessory power supply direct-flow input signal FVIN, and the other end of capacitor C 1 links to each other with control ground GND.
This circuit can be realized the protection to major loop when AC-input voltage is too high.Power to accessory power supply by diode VD1 and resistance R 1 and capacitor C 1 during startup, carrying out AC-input voltage simultaneously detects, first, when AC-input voltage just often, it is low that ac sampling signal is given the given reference voltage (5 pin of amplifier D1B) of the level ratio of 6 pin of amplifier D1B, the output signal AC-H of amplifier D1B is a high level, triode VT1 conducting, the control signal RELAY-K1 of auxiliary relay K1 is a low level, auxiliary relay K1 adhesive, main power circuit is given output electrochemical capacitor C4 charging through resistance R 12, when AC-H is high level, resistance R 11, R8 begins to discharge and recharge to C2, when the voltage on the C2 rises to when being higher than given reference voltage (2 pin of amplifier D1A), amplifier D1A exports high level, the VT2 conducting, the control signal RELAY-K1 of main relay K1 is a low level, main relay K1 adhesive, branch, short-circuit with auxiliary relay crosstalk resistance R12, main loop of power circuit is given rectifier bridge VD10 power supply by main relay K1, and after the main relay K1 adhesive, accessory power supply is powered by POWER, the branch road of diode VD1 crosstalk resistance R1 flows through electric current hardly, and power supply enters normal operating conditions; Second, when AC-input voltage is too high, ac sampling signal is given given reference voltage (5 pin of the amplifier D1B) height of level ratio of 6 pin of amplifier D1B, the output signal AC-H of amplifier D1B is a low level, triode VT1 ends, the control signal RELAY-K1 of auxiliary relay K1 is a high level, auxiliary relay K1 keeps off-state, when AC-H is low level, voltage on the C2 is kept low level, amplifier D1A output low level, VT2 ends, and the control signal RELAY-K1 of main relay K1 is a high level, and main relay K1 keeps off-state, thereby exchange the input high pressure and can not scurry into main loop of power circuit, accessory power supply is by branch road and capacitor C 1 power supply of diode VD1 crosstalk resistance R1; The 3rd, after the power supply operate as normal, exchange input after pressure, ac sampling signal is given given reference voltage (5 pin of the amplifier D1B) height of level ratio of 6 pin of amplifier D1B, the output signal AC-H of amplifier D1B is a low level, triode VT1 ends, the control signal RELAY-K1 of auxiliary relay K1 is a high level, auxiliary relay K1 disconnects, when AC-H is low level, diode VD5 discharges to C2 immediately, promptly give main relay K1 time-delay reset, voltage on the C2 is lower than given reference voltage (2 pin of amplifier D1A), amplifier D1A output low level, and VT2 ends, the control signal RELAY-K1 of main relay K1 is a high level, main relay K1 disconnects, thereby fast, cut off main loop of power circuit fully, realize overvoltage protection, voltage POWER on the output capacitance C4 will descend and directly zero lie prostrate, and accessory power supply is by branch road and the power supply of capacitor C 1 rectifying and wave-filtering of diode VD1 crosstalk resistance R1; The 4th, recover just often again after the interchange input overvoltage, reenter first state.
Device of the present invention is by detecting the interchange input high voltage protection that the AC-input voltage situation realizes power supply; can be to not having power factor correction and having the power supply of power factor correction to protect; this protective device is not only applicable to power supply simultaneously; can be used in simultaneously in the electric equipment products that various uses exchange input main power circuit is carried out high voltage protective; its interchange input promptly can be single-phase in addition; also be applicable to three-phase alternating current input, only need all to make the live wire L among the schematic diagram 2-6 and zero line N into live wire and get final product.Device of the present invention is quick, reliable, and the element that is increased is Resistor-Capacitor Unit, diode, triode, amplifier and auxiliary relay commonly used, and quantity is few, and cost is low, does not increase extra power consumption during operate as normal substantially, has improved the reliability of power supply greatly.
Claims (8)
1, a kind of high voltage protective device for input of AC electrical source comprises auxiliary relay control circuit, AC-input voltage testing circuit, it is characterized in that, also comprises high voltage protection main circuit, main relay control circuit and accessory power supply power supply circuits;
Described high voltage protection main circuit further comprises rectifier bridge, electrochemical capacitor, main relay and auxiliary relay;
Described AC-input voltage testing circuit one end is connected with live wire L, the zero line N line of major loop, respectively to described main relay control circuit and auxiliary relay control circuit output AC input voltage detection signal; Described main relay control circuit is controlled the adhesive or the disconnection of main relay in the described high voltage protection main circuit according to the AC-input voltage detection signal; Described auxiliary relay control circuit is controlled the adhesive or the disconnection of auxiliary relay in the described high voltage protection main circuit according to the AC-input voltage detection signal; The interchange of described high voltage protection main circuit input after the rectifier bridge rectification to the electrochemical capacitor power supply, for the conversion of described accessory power supply power supply circuits and back provides a DC power supply; Described accessory power supply power supply circuits provide direct-current input power supplying to accessory power supply, and the interchange by major loop simultaneously inputs to the accessory power supply power supply.
2, high voltage protective device for input of AC electrical source according to claim 1 is characterized in that, auxiliary relay in the described high voltage protection main circuit and main relay are adhesive just often in AC-input voltage, otherwise all disconnects immediately; Described auxiliary relay elder generation adhesive under the normal working voltage, described main relay delay time voltage on electrochemical capacitor and AC-input voltage peak value near the time adhesive.
3, high voltage protective device for input of AC electrical source according to claim 1 is characterized in that, described accessory power supply power supply circuits further comprise rectifier diode, anti-surge resistance and electric capacity; Provide direct-current input power supplying to accessory power supply by described rectifier diode, anti-surge resistance and electric capacity when the power initiation; After normal, the described main relay adhesive of AC-input voltage, described rectifier diode, anti-surge resistance do not flow through electric current; During overvoltage protection, accessory power supply is fully through described rectifier diode, anti-surge resistance and capacitances to supply power.
4, high voltage protective device for input of AC electrical source according to claim 1, it is characterized in that described high voltage protection main circuit comprises main relay K1, auxiliary relay K2, resistance R 12, rectifier bridge VD10, electrochemical capacitor C4, resistance R 13, resistance R 14, diode VD6, diode VD7;
The contact of the contact of described main relay K1 and described auxiliary relay K2 links to each other with the live wire L that exchanges of input; Another contact of described auxiliary relay K2 links to each other with an end of described resistance R 12; Another contact of the other end of described resistance R 12, described main relay K1 links to each other with 1 pin of described rectifier bridge VD10; 3 pin of described rectifier bridge VD10 with exchange zero line N and link to each other, 2 pin of described rectifier bridge VD10, the positive pole of described electrochemical capacitor C4 link to each other with voltage signal POWER on it, and 4 pin of described rectifier bridge VD10, the negative pole of described electrochemical capacitor C4 and control ground GND link to each other; One end of described resistance R 13 links to each other with power supply VCC with an end of described resistance R 14, and an end of the other end of described resistance R 13, main relay K1 line bag links to each other with the negative electrode of described diode VD6; The other end of described main relay K1 line bag, the anode of described diode VD6 link to each other with the control signal RELAY-K1 of described main relay K1; One end of the other end of described resistance R 14 and described auxiliary relay K2 line bag links to each other with the negative electrode of described diode VD7; The other end of described auxiliary relay K2 line bag, the anode of described diode VD7 link to each other with the control signal RELAY-K2 of described auxiliary relay K2.
5, high voltage protective device for input of AC electrical source according to claim 1 is characterized in that, described auxiliary relay control circuit comprises resistance R 2, resistance R 4, diode VD3 and triode VT1;
One end of described resistance R 2 links to each other with power supply VCC; One end of the other end of described resistance R 2, described resistance R 4 links to each other with the anode of described diode VD3; The negative electrode of described diode VD3 links to each other with AC-input voltage detection signal AC-H; One end of the other end of described resistance R 4, resistance R 3 links to each other with the base stage of described triode VT1; The emitter of the other end of described resistance R 3, described triode VT1 links to each other with control ground GND; The collector electrode of described triode VT1 links to each other with the control signal RELAY-K2 of described auxiliary relay K2, and the control signal RELAY-K2 of described auxiliary relay K2 outputs to described high voltage protection main circuit.
6, high voltage protective device for input of AC electrical source according to claim 1, it is characterized in that described main relay control circuit comprises resistance R 11, resistance R 5, resistance R 6, resistance R 7, resistance R 8, resistance R 9, resistance R 10, diode VD4, diode VD5, amplifier D1A, capacitor C 2, triode VT2;
One end of one end of described resistance R 11, the negative electrode of diode VD4, resistance R 5 and 8 pin of described amplifier D1A link to each other with power supply VCC; One end of one end of the anode of the anode of the other end of described resistance R 11, diode VD5, diode VD4, resistance R 6, an end of capacitor C 2, resistance R 8 links to each other with 3 pin of described amplifier D1A; The negative electrode of described diode VD5 with exchange overvoltage detection signal AC-H and link to each other; One end of the other end of described resistance R 5, resistance R 9 links to each other with 2 pin of described amplifier D1A; The emitter of the other end of one end of described resistance R 7, the other end of resistance R 8, resistance R 9,4 pin of amplifier D1A, triode VT2 links to each other with control ground GND; 1 pin of the other end of described resistance R 6, amplifier D1A links to each other with an end of described resistance R 10; The other end of the other end of described resistance R 10, resistance R 7 links to each other with the base stage of described triode VT2; The collector electrode of described triode VT2 links to each other with the control signal RELAY-K1 of described main relay K1, and the control signal RELAY-K1 of described main relay K1 outputs to described high voltage protection main circuit.
7, high voltage protective device for input of AC electrical source according to claim 1, it is characterized in that described AC-input voltage testing circuit comprises diode VD8, diode VD9, resistance R 15, resistance R 16, resistance R 17, resistance R 18, resistance R 19, capacitor C 3, amplifier D1B;
The anode of described diode VD9 links to each other with the live wire L that exchanges input; The anode of described diode VD8 with exchange zero line N and link to each other; The negative electrode of the negative electrode of described diode VD9, diode VD8 links to each other with an end of described resistance R 15; One end of the other end of described resistance R 15, resistance R 19, an end of resistance R 16 link to each other with an end of described capacitor C 3; The other end of the other end of described resistance R 19, capacitor C 3 links to each other with control ground GND; The other end of described resistance R 16 links to each other with 6 pin of described amplifier D1B; One end of described resistance R 17 links to each other with voltage reference signal VREF; One end of the other end of described resistance R 17, resistance R 18 links to each other with 5 pin of described amplifier D1B; 7 pin of the other end of described resistance R 18, amplifier D1B link to each other with AC-input voltage detection signal AC-H, and AC-input voltage detection signal AC-H outputs to described main relay control circuit and described auxiliary relay control circuit.
8, high voltage protective device for input of AC electrical source according to claim 1 is characterized in that, described accessory power supply power supply circuits comprise resistance R 1, diode VD1, diode VD2, capacitor C 1, output electrochemical capacitor C4;
One end of described resistance R 1 links to each other with the live wire L that exchanges input, and the other end links to each other with the anode of diode VD1; The anode of described diode VD2 links to each other with voltage signal POWER on the described output electrochemical capacitor C4; One end of the negative electrode of the negative electrode of described diode VD1, diode VD2, capacitor C 1 links to each other with accessory power supply direct-flow input signal FVIN; The other end of described capacitor C 1 links to each other with control ground GND.
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| CN113296028A (en) * | 2021-05-25 | 2021-08-24 | 佛山市顺德区美的电子科技有限公司 | Direct current load fault detection circuit and household appliance with same |
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