Alternating current switching circuit

Abstract

The invention is a divisional application with the patent application number of 202110545391.5, and relates to the technical field of agricultural machinery. The invention discloses an alternating current switching circuit, which is characterized in that a power input circuit, a linkage tripping switch, an electric leakage detection tripping induction voltage output circuit, a power output circuit, a high-voltage direct current circuit and a low-voltage direct current voltage stabilizing circuit are connected in sequence, the low-voltage direct-current voltage stabilizing circuit is respectively connected with an open-phase detection circuit and a tripping negative current amplification trigger circuit, the tripping negative current amplification trigger circuit, the anti-series interference circuit and the silicon controlled direct-current high-voltage switching circuit are connected in sequence, and the electric leakage detection tripping induction voltage output circuit is connected with the anti-series interference circuit. The silicon controlled rectifier direct-current high-voltage switch circuit is connected with the linkage trip switch, the power output circuit is connected with the open-phase detection circuit, the open-phase detection circuit is connected with the trip negative current amplification trigger circuit, and the high-voltage direct-current circuit is connected with the silicon controlled rectifier direct-current high-voltage switch circuit. The electronic components of the product are integrated on a small circuit board, so that the circuit is simple, the cost is low, the use is sensitive, the application range is wide, and the product is safe, reliable and high in quality through practice test.

Description

[0001] This application is a divisional application. The original patent application number is: 202110545391.5, the original application date is May 19, 2021, and the original invention name is "A kind of AC switching circuit". Technical Field

[0002] The present invention relates to a switching circuit, in particular to an alternating current switching circuit. Background Art

[0003] Three-phase phase loss trip switches are widely used. Mechanical, electrical, and three-phase motors can suffer phase loss due to burnout fuses or poor contact at the terminal terminals. To prevent motor burnout and damage to mechanical equipment, especially high-power motors, they must be equipped with automatic phase loss protection to protect the motor from phase loss. Currently, factories and businesses use three-phase phase loss trip switches assembled by experienced electricians using AC contactors and current transformers for three-phase phase loss detection in conjunction with electrical components. Most current three-phase phase loss trip switches are assembled from loose parts or multiple mechanical and electronic components, making them difficult for novice electricians to install. Failure to install them can easily lead to failures, waste assembly time, and be very expensive. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention provides an AC switching circuit applicable to three phases, which forms a phase loss tripping and leakage tripping by integrating a composite circuit.

[0005] The solutions to the above technical problems are:

[0006] An AC switch circuit comprises a power input circuit (1), a linked tripping switch (2), a leakage tripping detection induction voltage output circuit (21), and a power output circuit (3). The power input circuit (1) is connected to the linked tripping switch (2), the linked tripping switch (2) is connected to the leakage tripping detection induction voltage output circuit (21), the leakage tripping detection induction voltage output circuit (21) is connected to the power output circuit (3), the power output circuit (3) is connected to a high-voltage DC circuit (4), the high-voltage DC circuit (4) is connected to a low-voltage DC voltage stabilizing circuit (5), and the low-voltage DC voltage stabilizing circuit (5) is respectively connected to a phase loss detection circuit (4). The detection circuit (6) and the tripping negative current amplifying trigger circuit (7) are connected to the tripping negative current amplifying trigger circuit (7), the tripping negative current amplifying trigger circuit (7) is connected to the anti-series interference circuit (71), the anti-series interference circuit (71) is connected to the thyristor DC high-voltage switch circuit (8), the leakage tripping induction voltage output circuit (21) is connected to the anti-series interference circuit (71), the thyristor DC high-voltage switch circuit (8) is connected to the linked tripping switch (2), the power output circuit (3) is connected to the phase loss detection circuit (6), the phase loss detection circuit (6) is connected to the tripping negative current amplifying trigger circuit (7), and the high-voltage DC circuit (4) is connected to the thyristor DC high-voltage switch circuit (8).

[0007] The AC switching circuit of the present invention has the following advantages: 1. This product is suitable for phase loss applications in three-phase circuits, based on the circuit's access and output requirements. All electronic components are integrated on a small circuit board, resulting in a simple circuit, low cost, flexible operation, and a wide range of applications. It has been proven safe, reliable, and of high quality in practice. 2. This product features tripping for overload, power outage, leakage, overload protection, and phase loss protection, providing a multifunctional tripping protection circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 This is a circuit block diagram of the phase loss trip switch of the product of the present invention;

[0009] Figure 2 This is a circuit block diagram of the phase loss, power outage, leakage, and overload protection trip switch of the product of the present invention;

[0010] Figure 3 This is a circuit diagram of the phase loss trip switch of the product of the present invention;

[0011] Figure 4 This is a circuit diagram of the phase loss, power outage, leakage, and overload protection trip switch of the product of the present invention;

[0012] Figure 5 This is a circuit diagram of the phase loss trip switch of the product of the present invention;

[0013] Figure 6 This is a circuit diagram of the phase loss, power outage, leakage, and overload protection trip switch of the product of the present invention;

[0014] Figure 7 This is a circuit diagram of the phase loss trip switch of the product of the present invention;

[0015] Figure 8 This is a circuit diagram of the phase loss, power outage, leakage and overload protection trip switch of the product of the present invention. DETAILED DESCRIPTION

[0016] An AC switching circuit includes a power input circuit, a linked trip switch, and a power output circuit. The power input circuit is connected to the linked trip switch, which is connected to the power output circuit. The power output circuit is connected to a high-voltage DC circuit, which is connected to a low-voltage DC voltage stabilizing circuit. The low-voltage DC voltage stabilizing circuit is respectively connected to a phase loss detection circuit and a trip negative current amplification trigger circuit. The trip negative current amplification trigger circuit is connected to a thyristor DC high-voltage switching circuit. The thyristor DC high-voltage switching circuit is connected to the linked trip switch. The power output circuit is connected to the phase loss detection circuit, which is connected to the trip negative current amplification trigger circuit. The high-voltage DC circuit is connected to the thyristor DC high-voltage switching circuit.

[0017] The high-voltage DC circuit is used to convert high-voltage AC into high-voltage DC; the low-voltage DC voltage stabilization circuit is used to convert high-voltage DC into low-voltage DC; the phase loss detection circuit is used to detect whether there is power passing through or whether it is lower than the set voltage; the trip negative current amplification trigger circuit is used to provide backup power in the event of phase loss or power outage to trigger the tripping and power-off operation of the linked tripping switch; the thyristor DC high-voltage switch circuit provides a reasonable trigger circuit for tripping and powering off;

[0018] Furthermore: the high-voltage DC circuit includes at least a diode D9, a diode D10, a diode D12, and a diode D13; the cathodes of the diodes D9 and D10 are connected to the interlocking trip switch, and the anodes are connected to the power output circuit; the cathodes of the diodes D12 and D13 are connected to the power output circuit, and the anodes are connected to the circuit neutral line E.

[0019] Furthermore: the high-voltage DC circuit also includes a diode D8 and a diode D11, the cathode of the diode D8 is connected to the interlocking trip switch, and the anode is connected to the power output circuit; the cathode of the diode D11 is connected to the power output circuit, and the anode is connected to the circuit neutral line E.

[0020] Further: the phase loss detection circuit includes a resistor R5, a diode D7, and a photoelectric switch EDK3; one end of the resistor R5 is connected to the power output circuit, and the other end is connected to the positive electrode of the diode D7, the negative electrode of the diode D7 is connected to pin 1 of the photoelectric switch EDK3, pin 2 of the photoelectric switch EDK3 is connected to the power output circuit, pin 3 of the photoelectric switch EDK3 is connected to the low-voltage DC voltage stabilization circuit, and pin 4 of the photoelectric switch EDK3 is connected to the tripping negative current amplification trigger circuit.

[0021] Further: the phase loss detection circuit includes a diode D4, a diode D5, a resistor R4, a photoelectric switch EDK2, a resistor R5, a diode D6, a diode D7, and a photoelectric switch EDK3;

[0022] One end of the resistor R5 is connected to the power output circuit, and the other end is connected to the anode of the diode D7 and the cathode of the diode D6. The cathode of the diode D7 is connected to pin 1 of the photoelectric switch EDK3. Pin 2 of the photoelectric switch EDK3 is connected to the anodes of the diodes D4 and D6. Pin 3 of the photoelectric switch EDK3 is connected to the low-voltage DC voltage stabilizing circuit. Pin 4 of the photoelectric switch EDK3 is connected to pin 3 of the photoelectric switch EDK2. Pin 4 of the photoelectric switch EDK2 is connected to the trip negative current amplification trigger circuit.

[0023] One end of the resistor R4 is connected to the power output circuit, and the other end is connected to the anode of the diode D5 and the cathode of the diode D4. The cathode of the diode D5 is connected to pin 1 of the photoelectric switch EDK2, and pin 2 of the photoelectric switch EDK2 is connected to the anode of the diode D4.

[0024] Further: the phase loss detection circuit includes a diode D2, a diode D3, a resistor R3, a photoelectric switch EDK1, a diode D4, a diode D5, a resistor R4, a photoelectric switch EDK2, a resistor R5, a diode D6, a diode D7, and a photoelectric switch EDK3;

[0025] One end of the resistor R3 is connected to the power output circuit, and the other end is connected to the anode of the diode D3 and the cathode of the diode D2. The cathode of the diode D3 is connected to pin 1 of the photoelectric switch EDK1, the 2nd pin of the photoelectric switch EDK1 is connected to the anode of the diode D2, and the 4th pin of the photoelectric switch EDK1 is connected to the trip negative current amplification trigger circuit.

[0026] One end of the resistor R4 is connected to the power output circuit, and the other end is connected to the anode of the diode D5 and the cathode of the diode D4. The cathode of the diode D5 is connected to pin 1 of the photoelectric switch EDK2, the pin 2 of the photoelectric switch EDK2 is connected to the anode of the diode D4, and the pin 4 of the photoelectric switch EDK2 is connected to the pin 3 of the photoelectric switch EDK1.

[0027] One end of the resistor R5 is connected to the power output circuit, and the other end is connected to the anode of the diode D7 and the cathode of the diode D6. The cathode of the diode D7 is connected to pin 1 of the photoelectric switch EDK3. Pin 2 of the photoelectric switch EDK3 is connected to the anodes of the diodes D2, D4, and D6. Pin 3 of the photoelectric switch EDK3 is connected to the low-voltage DC voltage stabilizing circuit. Pin 4 of the photoelectric switch EDK3 is connected to pin 3 of the photoelectric switch EDK2.

[0028] Furthermore, the low-voltage DC voltage stabilization circuit includes a resistor R6, a Zener diode W1, and a Zener diode W2, which are connected in series. The end of resistor R6 is connected to the interlocking trip switch, the positive electrode of Zener diode W2 is connected to the circuit neutral line E, the other end of resistor R6 and the negative electrode of Zener diode W1 are connected to the phase loss detection circuit, and the positive electrode of Zener diode W1 and the negative electrode of Zener diode W2 are connected to the trip negative current amplification trigger circuit. The operating voltage of the low-voltage DC voltage stabilization circuit is 3V to 30V.

[0029] Further: the trip negative current amplification trigger circuit includes a capacitor C2, a capacitor C3, a resistor R1, a resistor R7, a resistor R8, a diode D1, a PNP transistor, and an NPN transistor;

[0030] One end of the resistor R7 is connected to the phase loss detection circuit, and the other end is connected to the b-pole of the NPN transistor and the resistor R8, and the other end of the resistor R8 is connected to the circuit neutral line E;

[0031] The NPN transistor's C-pole is connected to a low-voltage DC voltage stabilization circuit; the NPN transistor's E-pole is connected to the positive electrode of diode D1, one end of resistor R1, the PNP transistor's B-pole, and one end of capacitor C2; the PNP transistor's B-pole is connected to one end of capacitor C2; the PNP transistor's E-pole is connected to the negative electrode of diode D1 and one end of capacitor C3; the PNP transistor's C-pole is connected to a thyristor DC high-voltage switching circuit; the other ends of capacitor C2, resistor R1, and capacitor C3 are connected to the circuit neutral line E; the NPN transistor is disposed between resistors R7 and R8 to stabilize the NPN transistor's operating voltage. The operating voltage of the trip negative current amplification trigger circuit is 3V to 30V.

[0032] Further: the thyristor DC high-voltage switch circuit includes a thyristor BT1 and a capacitor C1, and the thyristor BT1 includes a G pole, a K pole, and an A pole; the C pole of the PNP transistor is connected to the G pole of the thyristor BT1, one end of the capacitor C1 is connected to the G pole of the thyristor BT1, and the other end of the capacitor C1 is connected to the circuit neutral line E; the K pole of the thyristor BT1 is connected to the circuit neutral line E, and the A pole of the thyristor BT1 is connected to the interlocking trip switch 2.

[0033] Further: A switching circuit also includes a leakage tripping induction voltage output circuit and an anti-series interference circuit. The linked tripping switch is connected to the leakage tripping induction voltage output circuit, and the leakage tripping induction voltage output circuit is connected to the power supply output circuit; the tripping negative current amplification trigger circuit is connected to the anti-series interference circuit, the anti-series interference circuit is connected to the thyristor DC high-voltage switch circuit, and the leakage tripping induction voltage output circuit is connected to the anti-series interference circuit.

[0034] Capacitors C1, C2, and C3 are low-voltage energy storage capacitors, while capacitor C4 is a high-voltage energy storage capacitor that charges and stores energy when electricity is available. Resistors R1 through R10 are all current-limiting resistors to prevent damage to electronic components connected to their rear ends. Resistors R3, R4, and R5 are used to reduce the current at the load end. Adding a current-limiting resistor to the front end of the corresponding photoelectric switches EDK1, EDK2, and EDK3 can reduce the current flowing through the photoelectric switches and prevent damage. Diodes D2, D4, and D6 prevent the phase loss detection circuit from short-circuiting.

[0035] That is: an AC switch circuit, this circuit is a four-in-one trip switch for three-phase phase loss, power outage, leakage, and overload protection, including a power input circuit 1, a linkage trip switch 2, a leakage trip detection induction voltage output circuit 21, and a power output circuit 3. The power input circuit 1 is connected to the linkage trip switch 2, the linkage trip switch 2 is connected to the leakage trip detection induction voltage output circuit 21, the leakage trip detection induction voltage output circuit 21 is connected to the power output circuit 3, and the power output circuit 3 is connected to a high-voltage DC circuit 4, the high-voltage DC circuit 4 is connected to a low-voltage DC voltage stabilizing circuit 5, and the low The DC voltage stabilizing circuit 5 is respectively connected to the phase loss detection circuit 6 and the tripping negative current amplification trigger circuit 7, the tripping negative current amplification trigger circuit 7 is connected to the anti-series interference circuit 71, the anti-series interference circuit 71 is connected to the thyristor DC high-voltage switch circuit 8, the leakage tripping induction voltage output circuit 21 is connected to the anti-series interference circuit 71, the thyristor DC high-voltage switch circuit 8 is connected to the linked tripping switch 2, the power output circuit 3 is connected to the phase loss detection circuit 6, the phase loss detection circuit 6 is connected to the tripping negative current amplification trigger circuit 7, and the high-voltage DC circuit 4 is connected to the thyristor DC high-voltage switch circuit 8.

[0036] The tripping negative current amplifying trigger circuit 7 is connected to a phase-loss signal lamp 9 .

[0037] The power output circuit 3 is composed of a neutral wire and a live wire or two live wires or three live wires; a neutral wire and a live wire constitute a single-phase power output circuit; two live wires constitute a two-phase power output circuit, for example: live wire L11 and live wire L21; three live wires constitute a three-phase power output circuit, for example: live wire L11, live wire L21, and live wire L31.

[0038] Example 1:

[0039] like Figure 1 、 Figure 3 As shown: an AC switching circuit, which is a three-phase phase loss trip switch, includes a power input circuit 1, a linked trip switch 2, and a power output circuit 3. The power input circuit 1 is connected to the linked trip switch 2, and the linked trip switch 2 is connected to the power output circuit 3. The power output circuit 3 is connected to a high-voltage DC circuit 4, which is connected to a low-voltage DC voltage regulator circuit 5. The low-voltage DC voltage regulator circuit 5 is respectively connected to a phase loss detection circuit 6 and a trip negative current amplification trigger circuit 7. The trip negative current amplification trigger circuit 7 is connected to a thyristor DC high-voltage switch circuit 8. The thyristor DC high-voltage switch circuit 8 is connected to the linked trip switch 2, the power output circuit 3 is connected to the phase loss detection circuit 6, the phase loss detection circuit 6 is connected to the trip negative current amplification trigger circuit 7, and the high-voltage DC circuit 4 is connected to the thyristor DC high-voltage switch circuit 8;

[0040] The tripping negative current amplifying trigger circuit 7 is connected to a phase-loss signal lamp 9;

[0041] The power input circuit 1 includes a live wire L1, a live wire L2, and a live wire L3 for power input;

[0042] The linked trip switch 2 includes a linked switch K1, a linked switch K2, a linked switch K3, and a trip electromagnetic coil VH. The live wire L1, the live wire L2, and the live wire L3 are respectively connected to the linked switch K1, the linked switch K2, and the linked switch K3. The trip electromagnetic coil VH is magnetically connected to the linked switch K1, the linked switch K2, and the linked switch K3 as a whole, and is used to control the conduction and tripping of the three linked switches. The linked switch K1, the linked switch K2, the linked switch K3, and the trip electromagnetic coil VH constitute a trip linkage device QP as a whole.

[0043] The power output circuit 3 includes live wires L11, L21, and L31 for power output, which are connected to the output ends of the corresponding interlocking switches K1, K2, and K3.

[0044] The high-voltage DC circuit 4 includes a diode D8, a diode D9, a diode D10, a diode D11, a diode D12, and a diode D13; the cathodes of the diodes D8, D9, and D10 are connected to one end of the tripping electromagnetic coil VH, the anode of the diode D8 is connected to the live wire L31, the anode of the diode D9 is connected to the live wire L21, and the anode of the diode D10 is connected to the live wire L11; the cathode of the diode D11 is connected to the live wire L31, the cathode of the diode D12 is connected to the live wire L21, the cathode of the diode D13 is connected to the live wire L11, and the anodes of the diodes D11, D12, and D13 are connected to the circuit neutral line E;

[0045] The low-voltage DC voltage stabilizing circuit 5 includes a resistor R6, a voltage stabilizing diode W1, and a voltage stabilizing diode W2, which are connected in series in sequence. The end of the resistor R6 is connected to one end of the tripping electromagnetic coil VH, the positive electrode of the voltage stabilizing diode W2 is connected to the circuit neutral line E, the other end of the resistor R6 and the negative electrode of the voltage stabilizing diode W1 are connected to the 3rd pin of the photoelectric switch EDK3, and the positive electrode of the voltage stabilizing diode W1 and the negative electrode of the voltage stabilizing diode W2 are connected to the C pole of the NPN transistor;

[0046] The phase loss detection circuit 6 includes a diode D2, a diode D3, a resistor R3, a photoelectric switch EDK1, a diode D4, a diode D5, a resistor R4, a photoelectric switch EDK2, a resistor R5, a diode D6, a diode D7, and a photoelectric switch EDK3;

[0047] One end of the resistor R3 is connected to the live wire L31, and the other end is connected to the anode of the diode D3 and the cathode of the diode D2. The cathode of the diode D3 is connected to pin 1 of the photoelectric switch EDK1, pin 2 of the photoelectric switch EDK1 is connected to the anode of the diode D2, and pin 4 of the photoelectric switch EDK1 is connected to the resistor R7.

[0048] One end of the resistor R4 is connected to the live wire L21, and the other end is connected to the anode of the diode D5 and the cathode of the diode D4. The cathode of the diode D5 is connected to pin 1 of the photoelectric switch EDK2, the pin 2 of the photoelectric switch EDK2 is connected to the anode of the diode D4, and the pin 4 of the photoelectric switch EDK2 is connected to the pin 3 of the photoelectric switch EDK1.

[0049] One end of the resistor R5 is connected to the live wire L11, and the other end is connected to the anode of the diode D7 and the cathode of the diode D6. The cathode of the diode D7 is connected to pin 1 of the photoelectric switch EDK3. Pin 2 of the photoelectric switch EDK3 is connected to the anodes of the diodes D2, D4, and D6. Pin 3 of the photoelectric switch EDK3 is connected to one end of the resistor R6 and the cathode of the voltage-stabilizing diode W1. Pin 4 of the photoelectric switch EDK3 is connected to pin 3 of the photoelectric switch EDK2.

[0050] The trip negative current amplification trigger circuit 7 includes a capacitor C2, a capacitor C3, a resistor R1, a resistor R7, a resistor R8, a diode D1, a PNP transistor, and an NPN transistor;

[0051] One end of the resistor R7 is connected to the 4th pin of the photoelectric switch EDK1, and the other end is connected to the b-pole of the NPN transistor and the resistor R8, and the other end of the resistor R8 is connected to the circuit neutral line E;

[0052] The c-pole of the NPN transistor is connected to the positive electrode of the Zener diode W1 and the negative electrode of the Zener diode W2, the e-pole of the NPN transistor is connected to the positive electrode of the diode D1, one end of the resistor R1, the b-pole of the PNP transistor, and one end of the capacitor C2, the b-pole of the PNP transistor is connected to one end of the capacitor C2, the e-pole of the PNP transistor is connected to the negative electrode of the diode D1 and one end of the capacitor C3, the c-pole of the PNP transistor is connected to the G-pole of the thyristor BT1, and the other end of the capacitor C2, the other end of the resistor R1, and the other end of the capacitor C3 are connected to the circuit neutral line E;

[0053] The thyristor DC high-voltage switch circuit 8 includes a thyristor BT1 and a capacitor C1. The thyristor BT1 includes a G pole, a K pole, and an A pole. The C pole of the PNP transistor is connected to the G pole of the thyristor BT1, one end of the capacitor C1 is connected to the G pole of the thyristor BT1, and the other end of the capacitor C1 is connected to the circuit neutral line E. The K pole of the thyristor BT1 is connected to the circuit neutral line E, and the A pole of the thyristor BT1 is connected to the other end of the tripping electromagnetic coil VH.

[0054] The phase loss signal lamp includes a resistor R2 and a light emitting diode DE, which are connected in series. The positive electrode of the light emitting diode DE is connected to the e-pole of the NPN transistor, and the negative electrode is connected to the resistor R2. The other end of the resistor R2 is connected to the circuit neutral line E.

[0055] Working process:

[0056] Under normal circumstances, high-voltage power is input from live wires L1, L2, and L3. Interlocking switches K1, K2, and K3 are magnetically closed and turned on by tripping electromagnetic coil VH. High-voltage electricity is output from live wires L11, L21, and L31 after passing through interlocking switches K1, K2, and K3. This high-voltage AC power is converted into a high-voltage DC voltage by diodes D8, D9, D10, D11, D12, and D13. The three-phase high-voltage DC power supply is obtained by tripping electromagnetic coil VH, one end of resistor R6, and the negative electrodes of diodes D8, D9, and D10. The positive electrodes of diodes D11, D12, and D13 and the circuit neutral line E obtain the negative high-voltage DC power of the three-phase electricity.

[0057] Live wire L11 corresponds to phase A voltage, live wire L21 corresponds to phase B voltage, live wire L31 corresponds to phase C voltage;

[0058] The diode D2, the diode D3, the resistor R3, and the photoelectric switch EDK1 constitute a first phase loss detection circuit; the diode D4, the diode D5, the resistor R4, and the photoelectric switch EDK2 constitute a second phase loss detection circuit; the resistor R5, the diode D6, the diode D7, and the photoelectric switch EDK3 constitute a third phase loss detection circuit. The three phase loss detection circuits are connected in series and in parallel with respect to the live wires L11, L21, and L31.

[0059] The EY neutral line refers to the common line that connects pin 2 of photoelectric switch EDK1, pin 2 of photoelectric switch EDK2, and pin 2 of photoelectric switch EDK3;

[0060] The voltage and current of the live wire L31 (phase C) are connected to the EY neutral line in series and parallel through the resistor R3, diode D2, diode D3, and photoelectric switch EDK1. The voltage and current of the live wire L21 (phase B) are connected to the EY neutral line in series and parallel through the resistor R4, diode D4, diode D5, and photoelectric switch EDK2. The voltage and current of the live wire L11 (phase A) are connected to the EY neutral line in series and parallel through the resistor R5, diode D6, diode D7, and photoelectric switch EDK3. The live wire L31 supplies power to the photoelectric switch EDK1 through the current limiting resistor R3 and diode D3. The live wire L21 supplies power to the photoelectric switch EDK2 through the current limiting resistor R4 and diode D5. The live wire L11 supplies power to the photoelectric switch EDK3 through the current limiting resistor R5 and diode D7. As a result, there is current at pins 1 and 2 of the photoelectric switches EDK1, EDK2, and EDK3. Pins 3 and 4 of the photoelectric switch EDK1, EDK2, and EDK3 all conduct current, so that the low-voltage DC positive voltage at the cathode of the Zener diode W1 is connected to the pin-3 input and pin-4 output of the photoelectric switch EDK3, and then to the pin-3 input of the photoelectric switch EDK2 through the pin-4 output of the photoelectric switch EDK2. The pin-3 input and pin-4 output of the photoelectric switch EDK1 are connected to the resistor R7. The other end of the resistor R7 is connected to the b-pole of the NPN transistor in the trip negative current amplification trigger circuit. The c-pole and e-pole of the NPN transistor are conductive, so that the low-voltage DC positive voltage at the cathode of the Zener diode W2 is transmitted to the anode of the diode D1 and the resistor R1, the capacitor C2, and the b-pole of the PNP transistor. Since the b-pole of the PNP transistor can only work with a negative voltage input, the PNP transistor does not work, and the c-pole and e-pole of the PNP transistor are not conductive.

[0061] When one of the phases of the live wire L11, live wire L21, and live wire L31 of the power output circuit has no power or the voltage is lower than the set value (the voltage lower than the set value is regarded as no power output, for example: the normal voltage is 220V, and below 50V is regarded as no power), the photoelectric switch of the corresponding phase loss detection circuit will have no power (that is: when the live wire L11 has no power, pins 1 and 2 of the photoelectric switch EDK1 are not conducting, and the current between pins 3 and 4 is disconnected; when the live wire L21 has no power, pins 1 and 2 of the photoelectric switch EDK2 are not conducting, and the current between pins 3 and 4 is disconnected; when the live wire L31 has no power, pins 1 and 2 of the photoelectric switch EDK3 are not conducting, and the current between pins 3 and 4 is disconnected), the tripping negative current amplification trigger circuit 7 cannot obtain a positive voltage, When no electricity flows through the resistor R7, the NPN transistor does not work, and the C-pole and the E-pole of the NPN transistor are not conducting, causing the B-pole of the PNP transistor to change from a positive potential to a negative potential. The PNP transistor works, and the C-pole and the E-pole of the PNP transistor are conducting. The positive voltage of the capacitor C3 is sent to the G-pole of the thyristor BT1 through the C-pole and the E-pole of the PNP transistor. The G-pole of the thyristor BT1 is triggered by the positive voltage, and the K-pole and the A-pole of the thyristor BT1 are conducting. The coil of the tripping electromagnetic coil VH receives a rectified high-voltage current, and the tripping electromagnetic coil VH instantly pulls the interlocking switch K1, the interlocking switch K2, and the interlocking switch K3 to trip. The capacitors C1 and C2 provide the instantaneous electric energy required for the triggering, making the trigger circuit work stably.

[0062] When one or two of the live wires (live wire L11, live wire L21, live wire L31) of the power output circuit have no power or the voltage is lower than the set value, at least one of them has normal voltage. Therefore, at least one group of the high-voltage DC circuit has normal voltage. After the G pole of the thyristor BT1 triggers the K pole and the A pole to conduct, the voltage and current have enough electrical energy to provide the tripping electromagnetic coil VH to pull the interlocking switch K1, interlocking switch K2, and interlocking switch K3 to trip in a coordinated manner.

[0063] The light-emitting diode DE is used to indicate the phase loss signal. If it is on, it is normal, and if it is off, it means the phase is lost. The resistor R2 is the current limiting resistor of the light-emitting diode DE.

[0064] This circuit is a three-phase phase loss trip switch. It is used in the same way as a conventional popular toggle switch, but its innovation enables it to automatically trip and cut off power immediately when a phase is lost. This circuit can be used to manufacture phase loss trip switches with various specifications and power requirements. The switch output power can be as low as a few watts, suitable for various automatic circuit controls, and as high as hundreds of kilowatts, suitable for use in industrial and mining enterprises. Without changing any structure or function, the phase loss trip circuit of the present invention can be used to increase the power supply to become a phase loss trip switch, thereby protecting electrical equipment and appliances through phase loss tripping.

[0065] Example 2:

[0066] like Figure 2 、 Figure 4 As shown: An AC switch circuit, this circuit is a four-in-one trip switch with three-phase phase loss, power outage, leakage, and overload protection, including a power input circuit 1, a linked trip switch 2, a leakage trip detection induction voltage output circuit 21, and a power output circuit 3. The power input circuit 1 is connected to the linked trip switch 2, the linked trip switch 2 is connected to the leakage trip detection induction voltage output circuit 21, and the leakage trip detection induction voltage output circuit 21 is connected to the power output circuit 3. The power output circuit 3 is connected to a high-voltage DC circuit 4, and the high-voltage DC circuit 4 is connected to a low-voltage DC voltage stabilizing circuit 5. The low-voltage DC voltage stabilizing circuit 5 is respectively connected to a phase loss detection circuit 6 and a tripping negative current amplification trigger circuit 7, the tripping negative current amplification trigger circuit 7 is connected to an anti-series interference circuit 71, the anti-series interference circuit 71 is connected to a thyristor DC high-voltage switch circuit 8, the leakage tripping induced voltage output circuit 21 is connected to the anti-series interference circuit 71, the thyristor DC high-voltage switch circuit 8 is connected to the linked tripping switch 2, the power output circuit 3 is connected to the phase loss detection circuit 6, the phase loss detection circuit 6 is connected to the tripping negative current amplification trigger circuit 7, and the high-voltage DC circuit 4 is connected to the thyristor DC high-voltage switch circuit 8;

[0067] The tripping negative current amplifying trigger circuit 7 is connected to a phase-loss signal lamp 9;

[0068] The power input circuit 1 includes a live wire L1, a live wire L2, and a live wire L3 for power input;

[0069] The linked trip switch 2 includes a linked switch K1, a linked switch K2, a linked switch K3, and a trip electromagnetic coil VH. The live wire L1, the live wire L2, and the live wire L3 are respectively connected to the linked switch K1, the linked switch K2, and the linked switch K3. The trip electromagnetic coil VH is magnetically connected to the linked switch K1, the linked switch K2, and the linked switch K3 as a whole, and is used to control the conduction and tripping of the three linked switches. The linked switch K1, the linked switch K2, the linked switch K3, and the trip electromagnetic coil VH constitute a trip linkage device QP as a whole.

[0070] The power output circuit 3 includes an overload electromagnetic coil AH, an overload electromagnetic coil BH, an overload electromagnetic coil CH, a live wire L11, a live wire L21, and a live wire L31 for power output. The linkage switch K1, the linkage switch K2, and the linkage switch K3 are connected to one end of the corresponding overload electromagnetic coil AH, the overload electromagnetic coil BH, and the overload electromagnetic coil CH. The other ends of the overload electromagnetic coil AH, the overload electromagnetic coil BH, and the overload electromagnetic coil CH are connected to the corresponding live wire L11, the live wire L21, and the live wire L31 for output; the overload electromagnetic coil AH, the overload electromagnetic coil BH, and the overload electromagnetic coil CH provide overload protection for the power output (the overload electromagnetic coil is also called an overload protector), preventing the electrical equipment connected to the power output circuit 3 from being overloaded, thereby protecting the electrical equipment;

[0071] The leakage tripping induction voltage output circuit 21 includes a voltage induction magnetic ring TE, a leakage detection coil TA, a voltage induction coil TC, a leakage detection switch K4, a resistor R9, and a resistor R10;

[0072] The live wires L11, L21, and L31 pass through the voltage induction magnetic ring TE; the leakage detection coil TA is wound around the voltage induction magnetic ring TE; the voltage induction coil TC is wound around the voltage induction magnetic ring TE; the voltage induction coil TC is located at the other end of the leakage detection coil TA, which is farther away;

[0073] One end of the leakage detection switch K4 is connected to the live wire L21, and the other end is connected to one end of the leakage detection coil TA, the other end of the leakage detection coil TA is connected to one end of the resistor R10, and the other end of the resistor R10 is connected to the live wire L11;

[0074] Pin 2 of the voltage induction coil TC is connected to the circuit neutral line E, and pin 1 of the voltage induction coil TC is connected to one end of the resistor R9;

[0075] The anti-crosstalk circuit 71 includes a diode D14 and a diode D15. The other end of the resistor R9 is connected to the anode of the diode D14, the cathode of the diode D14 is connected to the G electrode of the thyristor BT1, the anode of the diode D15 is connected to the C electrode of the PNP transistor, and the cathode of the diode D15 is connected to the G electrode of the thyristor BT1.

[0076] The high-voltage DC circuit 4 includes a diode D8, a diode D9, a diode D10, a diode D11, a diode D12, and a diode D13; the cathodes of the diodes D8, D9, and D10 are connected to one end of the tripping electromagnetic coil VH, the anode of the diode D8 is connected to the live wire L31, the anode of the diode D9 is connected to the live wire L21, and the anode of the diode D10 is connected to the live wire L11; the cathode of the diode D11 is connected to the live wire L31, the cathode of the diode D12 is connected to the live wire L21, the cathode of the diode D13 is connected to the live wire L11, and the anodes of the diodes D11, D12, and D13 are connected to the circuit neutral line E;

[0077] The low-voltage DC voltage stabilizing circuit 5 includes a resistor R6, a voltage stabilizing diode W1, and a voltage stabilizing diode W2, which are connected in series in sequence. The end of the resistor R6 is connected to one end of the tripping electromagnetic coil VH, the positive electrode of the voltage stabilizing diode W2 is connected to the circuit neutral line E, the other end of the resistor R6 and the negative electrode of the voltage stabilizing diode W1 are connected to the 3rd pin of the photoelectric switch EDK3, and the positive electrode of the voltage stabilizing diode W1 and the negative electrode of the voltage stabilizing diode W2 are connected to the C pole of the NPN transistor;

[0078] The phase loss detection circuit 6 includes a diode D2, a diode D3, a resistor R3, a photoelectric switch EDK1, a diode D4, a diode D5, a resistor R4, a photoelectric switch EDK2, a resistor R5, a diode D6, a diode D7, and a photoelectric switch EDK3;

[0079] One end of the resistor R3 is connected to the live wire L31, and the other end is connected to the anode of the diode D3 and the cathode of the diode D2. The cathode of the diode D3 is connected to pin 1 of the photoelectric switch EDK1, pin 2 of the photoelectric switch EDK1 is connected to the anode of the diode D2, and pin 4 of the photoelectric switch EDK1 is connected to the resistor R7.

[0080] One end of the resistor R4 is connected to the live wire L21, and the other end is connected to the anode of the diode D5 and the cathode of the diode D4. The cathode of the diode D5 is connected to pin 1 of the photoelectric switch EDK2, the pin 2 of the photoelectric switch EDK2 is connected to the anode of the diode D4, and the pin 4 of the photoelectric switch EDK2 is connected to the pin 3 of the photoelectric switch EDK1.

[0081] One end of the resistor R5 is connected to the live wire L11, and the other end is connected to the anode of the diode D7 and the cathode of the diode D6. The cathode of the diode D7 is connected to pin 1 of the photoelectric switch EDK3. Pin 2 of the photoelectric switch EDK3 is connected to the anodes of the diodes D2, D4, and D6. Pin 3 of the photoelectric switch EDK3 is connected to one end of the resistor R6 and the cathode of the voltage-stabilizing diode W1. Pin 4 of the photoelectric switch EDK3 is connected to pin 3 of the photoelectric switch EDK2.

[0082] The trip negative current amplification trigger circuit 7 includes capacitors C2, C3, C4, resistors R1, R7, R8, diode D1, PNP transistor, and NPN transistor;

[0083] One end of the resistor R7 is connected to the 4th pin of the photoelectric switch EDK1, and the other end is connected to the b-pole of the NPN transistor and the resistor R8, and the other end of the resistor R8 is connected to the circuit neutral line E;

[0084] The positive electrode of the capacitor C4 is connected to the tripping electromagnetic coil VH, and the negative electrode is connected to the circuit neutral line E;

[0085] The c-pole of the NPN transistor is connected to the positive electrode of the Zener diode W1 and the negative electrode of the Zener diode W2, the e-pole of the NPN transistor is connected to the positive electrode of the diode D1, one end of the resistor R1, the b-pole of the PNP transistor, and one end of the capacitor C2, the b-pole of the PNP transistor is connected to one end of the capacitor C2, the e-pole of the PNP transistor is connected to the negative electrode of the diode D1 and one end of the capacitor C3, the c-pole of the PNP transistor is connected to the G-pole of the thyristor BT1, and the other end of the capacitor C2, the other end of the resistor R1, and the other end of the capacitor C3 are connected to the circuit neutral line E;

[0086] The thyristor DC high-voltage switch circuit 8 includes a thyristor BT1 and a capacitor C1. The thyristor BT1 includes a G pole, a K pole, and an A pole. The C pole of the PNP transistor is connected to the positive pole of the diode D15, the negative pole of the diode D15 is connected to the G pole of the thyristor BT1, one end of the capacitor C1 is connected to the G pole of the thyristor BT1, and the other end of the capacitor C1 is connected to the circuit neutral line E. The K pole of the thyristor BT1 is connected to the circuit neutral line E, and the A pole of the thyristor BT1 is connected to the other end of the tripping electromagnetic coil VH.

[0087] The phase loss signal lamp 9 includes a resistor R2 and a light emitting diode DE, which are connected in series. The positive electrode of the light emitting diode DE is connected to the e-pole of the NPN transistor, and the negative electrode is connected to the resistor R2. The other end of the resistor R2 is connected to the circuit neutral line E.

[0088] Working process:

[0089] The difference between this embodiment and embodiment 1 is that the tripping of overload power outage, leakage and overload protection is added; the principle of phase loss tripping is the same as that of embodiment 1;

[0090] The working process of the high-voltage DC circuit 4, the low-voltage DC voltage stabilizing circuit 5, the phase loss detection circuit 6, and the trip negative current amplification trigger circuit 7 has been described in the working process of Example 1 and will not be repeated here;

[0091] Power outage tripping process: When the power output circuit 3 has no power output as a whole, the high-voltage DC circuit 4, the low-voltage DC voltage stabilizing circuit 5, and the phase loss detection circuit 6 are all out of power, the tripping negative current amplification trigger circuit 7 cannot obtain a positive voltage, the resistor R7 has no power passing through, the NPN transistor does not work, the C pole and the E pole of the NPN transistor are not conducting, so that the B pole of the PNP transistor changes from a positive potential to a negative potential, and the PNP transistor becomes working, the C pole and the E pole of the PNP transistor are conducting, and the positive voltage of the capacitor C3 is connected to the PNP transistor. The C-pole and E-pole of the NP transistor are connected and sent to the G-pole of the thyristor BT1. The G-pole of the thyristor BT1 is triggered by a positive voltage, and the K-pole and A-pole of the thyristor BT1 are connected. Since the capacitor C4 is a high-voltage energy storage capacitor, the capacitor C4 is the coil of the tripping electromagnetic coil VH and obtains a rectified high-voltage current. The tripping electromagnetic coil VH instantly pulls the interlocking switch K1, the interlocking switch K2, and the interlocking switch K3 to trip. The capacitors C1 and C2 provide the instantaneous electric energy required for the triggering, so that the trigger circuit works stably.

[0092] Leakage tripping process: When one of the live wires of the power output circuit 3 leaks, the leakage detection coil TA and the voltage sensing coil TC are energized, the resistor R9 limits the voltage and current, the diode D14 prevents electric backflow, and the diode D15 prevents electric backflow from damaging the tripping negative current amplification trigger circuit. The voltage after D14 provides power to the G pole of the thyristor BT1 to trigger the K pole and the A pole to conduct. The high-voltage DC circuit 4 provides sufficient power for the tripping electromagnetic coil VH to instantly pull the interlocking switch K1, the interlocking switch K2, and the interlocking switch K3 to trip. Therefore, the interlocking switch K1, the interlocking switch K2, and the interlocking switch K3 trip as a whole.

[0093] Example 3:

[0094] like Figure 1 、 Figure 5 As shown: An AC switching circuit, which is a two-phase phase loss tripping switch and is suitable for two-phase electrical use, includes a power input circuit 1, a linked tripping switch 2, and a power output circuit 3. The power input circuit 1 is connected to the linked tripping switch 2, which is connected to the power output circuit 3. The power output circuit 3 is connected to a high-voltage DC circuit 4, which is connected to a low-voltage DC voltage stabilizing circuit 5. The low-voltage DC voltage stabilizing circuit 5 is respectively connected to a phase loss detection circuit 6 and a tripping negative current amplification trigger circuit 7, which is connected to a thyristor DC high-voltage switch circuit 8. The thyristor DC high-voltage switch circuit 8 is connected to the linked tripping switch 2, the power output circuit 3 is connected to the phase loss detection circuit 6, the phase loss detection circuit 6 is connected to the tripping negative current amplification trigger circuit 7, and the high-voltage DC circuit 4 is connected to the thyristor DC high-voltage switch circuit 8;

[0095] The tripping negative current amplifying trigger circuit 7 is connected to a phase-loss signal lamp 9;

[0096] The power input circuit 1 includes a live wire L1 and a live wire L2 for power input;

[0097] The linked trip switch 2 includes a linked switch K1, a linked switch K2, and a trip electromagnetic coil VH. The live wire L1 and the live wire L2 are respectively connected to the linked switch K1 and the linked switch K2. The trip electromagnetic coil VH is magnetically connected to the linked switch K1 and the linked switch K2 as a whole, and is used to control the conduction and tripping of the two linked switches. The linked switch K1, the linked switch K2, and the trip electromagnetic coil VH constitute a trip linkage device QP as a whole.

[0098] The power output circuit 3 includes a live wire L11 and a live wire L21 for power output, and the live wire L11 and the live wire L21 are connected to the output ends of the corresponding interlocking switches K1 and K2;

[0099] The high-voltage DC circuit 4 includes a diode D9, a diode D10, a diode D12, and a diode D13; the cathodes of the diodes D9 and D10 are connected to one end of the tripping electromagnetic coil VH, the anode of the diode D9 is connected to the live wire L21, and the anode of the diode D10 is connected to the live wire L11; the cathode of the diode D12 is connected to the live wire L21, the cathode of the diode D13 is connected to the live wire L11, and the anodes of the diodes D12 and D13 are connected to the circuit neutral line E;

[0100] The low-voltage DC voltage stabilizing circuit 5 includes a resistor R6, a voltage stabilizing diode W1, and a voltage stabilizing diode W2, which are connected in series in sequence. The end of the resistor R6 is connected to one end of the tripping electromagnetic coil VH, the positive electrode of the voltage stabilizing diode W2 is connected to the circuit neutral line E, the other end of the resistor R6 and the negative electrode of the voltage stabilizing diode W1 are connected to the 3rd pin of the photoelectric switch EDK3, and the positive electrode of the voltage stabilizing diode W1 and the negative electrode of the voltage stabilizing diode W2 are connected to the C pole of the NPN transistor;

[0101] The phase loss detection circuit 6 includes a diode D4, a diode D5, a resistor R4, a photoelectric switch EDK2, a resistor R5, a diode D6, a diode D7, and a photoelectric switch EDK3;

[0102] One end of the resistor R4 is connected to the live wire L21, and the other end is connected to the anode of the diode D5 and the cathode of the diode D4. The cathode of the diode D5 is connected to pin 1 of the photoelectric switch EDK2, the pin 2 of the photoelectric switch EDK2 is connected to the anode of the diode D4, and the pin 4 of the photoelectric switch EDK2 is connected to the resistor R7.

[0103] One end of the resistor R5 is connected to the live wire L11, and the other end is connected to the anode of the diode D7 and the cathode of the diode D6. The cathode of the diode D7 is connected to pin 1 of the photoelectric switch EDK3. Pin 2 of the photoelectric switch EDK3 is connected to the anodes of the diodes D2, D4, and D6. Pin 3 of the photoelectric switch EDK3 is connected to one end of the resistor R6 and the cathode of the voltage-stabilizing diode W1. Pin 4 of the photoelectric switch EDK3 is connected to pin 3 of the photoelectric switch EDK2.

[0104] The trip negative current amplification trigger circuit 7 includes a capacitor C2, a capacitor C3, a resistor R1, a resistor R7, a resistor R8, a diode D1, a PNP transistor, and an NPN transistor;

[0105] One end of the resistor R7 is connected to the 4th pin of the photoelectric switch EDK2, and the other end is connected to the b-pole of the NPN transistor and the resistor R8, and the other end of the resistor R8 is connected to the circuit neutral line E;

[0106] The c-pole of the NPN transistor is connected to the positive electrode of the Zener diode W1 and the negative electrode of the Zener diode W2, the e-pole of the NPN transistor is connected to the positive electrode of the diode D1, one end of the resistor R1, the b-pole of the PNP transistor, and one end of the capacitor C2, the b-pole of the PNP transistor is connected to one end of the capacitor C2, the e-pole of the PNP transistor is connected to the negative electrode of the diode D1 and one end of the capacitor C3, the c-pole of the PNP transistor is connected to the G-pole of the thyristor BT1, and the other end of the capacitor C2, the other end of the resistor R1, and the other end of the capacitor C3 are connected to the circuit neutral line E;

[0107] The thyristor DC high-voltage switch circuit 8 includes a thyristor BT1 and a capacitor C1. The thyristor BT1 includes a G pole, a K pole, and an A pole. The C pole of the PNP transistor is connected to the G pole of the thyristor BT1, one end of the capacitor C1 is connected to the G pole of the thyristor BT1, and the other end of the capacitor C1 is connected to the circuit neutral line E. The K pole of the thyristor BT1 is connected to the circuit neutral line E, and the A pole of the thyristor BT1 is connected to the other end of the tripping electromagnetic coil VH.

[0108] The phase loss signal lamp 9 includes a resistor R2 and a light emitting diode DE, which are connected in series. The positive electrode of the light emitting diode DE is connected to the e-pole of the NPN transistor, and the negative electrode is connected to the resistor R2. The other end of the resistor R2 is connected to the circuit neutral line E.

[0109] Working process:

[0110] Under normal circumstances, high-voltage power is input from live wires L1 and L2. Interlocking switches K1 and K2 are magnetically closed and turned on by tripping electromagnetic coil VH. High-voltage power passes through interlocking switches K1 and K2 and is output from live wires L11 and L21. This high-voltage AC power is converted into high-voltage DC voltage by diodes D9, D10, D12, and D13. High-voltage DC power is generated by tripping electromagnetic coil VH, one end of resistor R6, and the cathode of diodes D9 and D10. High-voltage DC negative power is generated by the anodes of diodes D12 and D13 and the circuit neutral line E. Live wire L11 corresponds to phase A voltage, and live wire L21 corresponds to phase B voltage.

[0111] The diode D4, the diode D5, the resistor R4, and the photoelectric switch EDK2 constitute a first phase loss detection circuit; the resistor R5, the diode D6, the diode D7, and the photoelectric switch EDK3 constitute a second phase loss detection circuit. The two phase loss detection circuits are connected in series and in parallel with respect to the live wires L11 and L21. The neutral line EY refers to the common line to which pin 2 of the photoelectric switch EDK2 and pin 2 of the photoelectric switch EDK3 are connected.

[0112] The voltage and current of the live wire L21 (phase B) are connected to the EY neutral line in series and parallel through the resistor R4, diode D4, diode D5, and photoelectric switch EDK2. The voltage and current of the live wire L11 (phase A) are connected to the EY neutral line in series and parallel through the resistor R5, diode D6, diode D7, and photoelectric switch EDK3. The live wire L21 supplies power to the photoelectric switch EDK2 through the current-limiting resistor R4 and diode D5. The live wire L11 supplies power to the photoelectric switch EDK3 through the current-limiting resistor R5 and diode D7. As a result, pins 1 and 2 of the photoelectric switches EDK2 and EDK3 both have current, so pins 3 and 4 of the photoelectric switches EDK2 and EDK3 both have current conduction. , so that the low-voltage DC positive voltage at the cathode of the Zener diode W1 is connected to the 3-pin input and 4-pin output of the photoelectric switch EDK3 to the 3-pin input of the photoelectric switch EDK2, and is connected to the resistor R7 through the 4-pin output of the photoelectric switch EDK2. The other end of the resistor R7 is connected to the b-pole of the NPN transistor in the trip negative current amplification trigger circuit. The c-pole and e-pole of the NPN transistor are conductive, so that the low-voltage DC positive voltage at the cathode of the Zener diode W2 is transmitted to the anode of the diode D1 and the resistor R1, the capacitor C2, and the b-pole of the PNP transistor. Since the b-pole of the PNP transistor can only work with a negative voltage input, the PNP transistor does not work, and the c-pole and e-pole of the PNP transistor are not conductive;

[0113] When one of the phases of the live wire L11 or the live wire L21 of the power output circuit has no power or the voltage is lower than the set value (the voltage lower than the set value is regarded as no power output, for example: the normal voltage is 220V, and below 50V is regarded as no power), the photoelectric switch of the corresponding phase loss detection circuit has no power (that is: when the live wire L11 has no power or is lower than the set voltage, pins 1 and 2 of the photoelectric switch EDK1 are not conducting, and the current between pins 3 and 4 is disconnected; when the live wire L21 has no power or is lower than the set voltage, pins 1 and 2 of the photoelectric switch EDK2 are not conducting, and the current between pins 3 and 4 is disconnected), the tripping negative current amplification trigger circuit 7 cannot obtain a positive voltage, the resistor R7 has no power passing, the NPN transistor does not work, the C pole and the e pole of the NPN transistor are not conducting, so that the b pole of the PNP transistor changes from a positive potential to a negative potential, the PNP transistor works, and the C pole and the e pole of the PNP transistor conduct. When the power supply is turned on, the positive voltage of capacitor C3 is transmitted to the G pole of thyristor BT1 through the C pole and the e pole of the PNP transistor. The G pole of thyristor BT1 is triggered by the positive voltage, and the K pole and the A pole of the thyristor BT1 are turned on. The coil of the tripping electromagnetic coil VH obtains the rectified high-voltage current. The tripping electromagnetic coil VH instantly pulls the interlocking switch K1 and the interlocking switch K2 to trip. The capacitors C1 and C2 provide the instantaneous electric energy required for the triggering, so that the trigger circuit works stably. When the live wires (live wire L11 and live wire L21) of one of the power output circuits have no power or the voltage is lower than the set value, the other one has normal voltage. Therefore, at least one group in the high-voltage DC circuit has normal voltage. After the G pole of the thyristor BT1 triggers the K pole and the A pole to be turned on, the voltage and current have enough electric energy to provide the tripping electromagnetic coil VH to pull the interlocking switch K1 and the interlocking switch K2 to trip in conjunction.

[0114] Example 4:

[0115] like Figure 2 、 Figure 6As shown: an AC switch circuit, this circuit is a four-in-one trip switch for two-phase phase loss, power outage, leakage, and overload protection, suitable for two-phase electrical use, including a power input circuit 1, a linkage trip switch 2, a leakage trip detection induction voltage output circuit 21, and a power output circuit 3. The power input circuit 1 is connected to the linkage trip switch 2, the linkage trip switch 2 is connected to the leakage trip detection induction voltage output circuit 21, and the leakage trip detection induction voltage output circuit 21 is connected to the power output circuit 3. The power output circuit 3 is connected to a high-voltage DC circuit 4, and the high-voltage DC circuit 4 is connected to a low-voltage DC stabilizing The voltage circuit 5 is connected to the low-voltage DC voltage stabilizing circuit 5, and the phase loss detection circuit 6 and the tripping negative current amplification trigger circuit 7 are connected to the tripping negative current amplification trigger circuit 7, and the tripping negative current amplification trigger circuit 7 is connected to the anti-series interference circuit 71, and the anti-series interference circuit 71 is connected to the thyristor DC high-voltage switch circuit 8. The leakage tripping induced voltage output circuit 21 is connected to the anti-series interference circuit 71, the thyristor DC high-voltage switch circuit 8 is connected to the linked trip switch 2, the power output circuit 3 is connected to the phase loss detection circuit 6, the phase loss detection circuit 6 is connected to the tripping negative current amplification trigger circuit 7, and the high-voltage DC circuit 4 is connected to the thyristor DC high-voltage switch circuit 8;

[0116] The tripping negative current amplifying trigger circuit 7 is connected to a phase-loss signal lamp 9;

[0117] The power input circuit 1 includes a live wire L1 and a live wire L2 for power input;

[0118] The linked trip switch 2 includes a linked switch K1, a linked switch K2, and a trip electromagnetic coil VH. The live wire L1 and the live wire L2 are respectively connected to the linked switch K1 and the linked switch K2. The trip electromagnetic coil VH is magnetically connected to the linked switch K1 and the linked switch K2 as a whole, and is used to control the conduction and tripping of the two linked switches. The linked switch K1, the linked switch K2, and the trip electromagnetic coil VH constitute a trip linkage device QP as a whole.

[0119] The power output circuit 3 includes an overload electromagnetic coil AH, an overload electromagnetic coil BH, a live wire L11, and a live wire L21 for power output. The linkage switch K1 and the linkage switch K2 are connected to one end of the corresponding overload electromagnetic coil AH and the overload electromagnetic coil BH. The other ends of the overload electromagnetic coil AH and the overload electromagnetic coil BH are connected to the corresponding live wire L11 and the live wire L21 for output.

[0120] The leakage tripping induction voltage output circuit 21 includes a voltage induction magnetic ring TE, a leakage detection coil TA, a voltage induction coil TC, a leakage detection switch K4, a resistor R9, and a resistor R10;

[0121] The live wires L11 and L21 pass through the voltage induction magnetic ring TE; the leakage detection coil TA is wound around the voltage induction magnetic ring TE; the voltage induction coil TC is wound around the voltage induction magnetic ring TE; the voltage induction coil TC is located at the other end of the leakage detection coil TA, which is farther away;

[0122] One end of the leakage detection switch K4 is connected to the live wire L21, and the other end is connected to one end of the leakage detection coil TA, the other end of the leakage detection coil TA is connected to one end of the resistor R10, and the other end of the resistor R10 is connected to the live wire L11;

[0123] Pin 2 of the voltage induction coil TC is connected to the circuit neutral line E, and pin 1 of the voltage induction coil TC is connected to one end of the resistor R9;

[0124] The anti-crosstalk circuit 71 includes a diode D14 and a diode D15. The other end of the resistor R9 is connected to the anode of the diode D14, the cathode of the diode D14 is connected to the G electrode of the thyristor BT1, the anode of the diode D15 is connected to the C electrode of the PNP transistor, and the cathode of the diode D15 is connected to the G electrode of the thyristor BT1.

[0125] The high-voltage DC circuit 4 includes a diode D9, a diode D10, a diode D12, and a diode D13; the cathodes of the diodes D9 and D10 are connected to one end of the tripping electromagnetic coil VH, the anode of the diode D9 is connected to the live wire L21, and the anode of the diode D10 is connected to the live wire L11; the cathode of the diode D12 is connected to the live wire L21, the cathode of the diode D13 is connected to the live wire L11, and the anodes of the diodes D12 and D13 are connected to the circuit neutral line E;

[0126] The positive electrode of the capacitor C4 is connected to the tripping electromagnetic coil VH, and the negative electrode is connected to the circuit neutral line E;

[0127] The low-voltage DC voltage stabilizing circuit 5 includes a resistor R6, a Zener diode W1, and a Zener diode W2, which are connected in series in sequence. One end of the resistor R6 is connected to one end of the tripping electromagnetic coil VH, the positive electrode of the Zener diode W2 is connected to the circuit neutral line E, the other end of the resistor R6 and the negative electrode of the Zener diode W1 are connected to pin 3 of the photoelectric switch EDK3, and the positive electrode of the Zener diode W1 and the negative electrode of the Zener diode W2 are connected to the c-pole of the NPN transistor;

[0128] The phase loss detection circuit 6 includes a diode D4, a diode D5, a resistor R4, a photoelectric switch EDK2, a resistor R5, a diode D6, a diode D7, and a photoelectric switch EDK3;

[0129] One end of the resistor R4 is connected to the live wire L21, and the other end is connected to the anode of the diode D5 and the cathode of the diode D4. The cathode of the diode D5 is connected to pin 1 of the photoelectric switch EDK2, the pin 2 of the photoelectric switch EDK2 is connected to the anode of the diode D4, and the pin 4 of the photoelectric switch EDK2 is connected to the resistor R7.

[0130] One end of the resistor R5 is connected to the live wire L11, and the other end is connected to the anode of the diode D7 and the cathode of the diode D6. The cathode of the diode D7 is connected to pin 1 of the photoelectric switch EDK3. Pin 2 of the photoelectric switch EDK3 is connected to the anodes of the diodes D2, D4, and D6. Pin 3 of the photoelectric switch EDK3 is connected to one end of the resistor R6 and the cathode of the voltage-stabilizing diode W1. Pin 4 of the photoelectric switch EDK3 is connected to pin 3 of the photoelectric switch EDK2.

[0131] The trip negative current amplification trigger circuit 7 includes a capacitor C2, a capacitor C3, a resistor R1, a resistor R7, a resistor R8, a diode D1, a PNP transistor, and an NPN transistor;

[0132] One end of the resistor R7 is connected to the 4th pin of the photoelectric switch EDK2, and the other end is connected to the b-pole of the NPN transistor and the resistor R8, and the other end of the resistor R8 is connected to the circuit neutral line E;

[0133] The c-pole of the NPN transistor is connected to the positive electrode of the Zener diode W1 and the negative electrode of the Zener diode W2, the e-pole of the NPN transistor is connected to the positive electrode of the diode D1, one end of the resistor R1, the b-pole of the PNP transistor, and one end of the capacitor C2, the b-pole of the PNP transistor is connected to one end of the capacitor C2, the e-pole of the PNP transistor is connected to the negative electrode of the diode D1 and one end of the capacitor C3, the c-pole of the PNP transistor is connected to the G-pole of the thyristor BT1, and the other end of the capacitor C2, the other end of the resistor R1, and the other end of the capacitor C3 are connected to the circuit neutral line E;

[0134] The thyristor DC high-voltage switch circuit 8 includes a thyristor BT1 and a capacitor C1. The thyristor BT1 includes a G pole, a K pole, and an A pole. The C pole of the PNP transistor is connected to the positive pole of the diode D15, the negative pole of the diode D15 is connected to the G pole of the thyristor BT1, one end of the capacitor C1 is connected to the G pole of the thyristor BT1, and the other end of the capacitor C1 is connected to the circuit neutral line E. The K pole of the thyristor BT1 is connected to the circuit neutral line E, and the A pole of the thyristor BT1 is connected to the other end of the tripping electromagnetic coil VH.

[0135] The phase loss signal lamp 9 includes a resistor R2 and a light emitting diode DE, which are connected in series. The positive electrode of the light emitting diode DE is connected to the e-pole of the NPN transistor, and the negative electrode is connected to the resistor R2. The other end of the resistor R2 is connected to the circuit neutral line E.

[0136] Working process: This embodiment differs from Example 2 in that it lacks a live wire L3, a linkage switch K3, a live wire L31, a diode D8, a diode D11, and a small group of phase loss detection circuits (i.e., the diode D2, the diode D3, the resistor R3, and the photoelectric switch EDK1). However, the working principle of the electronic components for phase loss, power outage, leakage tripping, and overload protection is the same as that of Example 2.

[0137] Example 5:

[0138] like Figure 1 、 Figure 7 As shown: An AC switching circuit, which is a single-phase phase loss tripping switch and is suitable for use with a household 220V power supply, includes a power input circuit 1, a linked tripping switch 2, and a power output circuit 3. The power input circuit 1 is connected to the linked tripping switch 2, which is connected to the power output circuit 3. The power output circuit 3 is connected to a high-voltage DC circuit 4, which is connected to a low-voltage DC voltage regulator circuit 5. The low-voltage DC voltage regulator circuit 5 is respectively connected to a phase loss detection circuit 6 and a tripping negative current amplification trigger circuit 7, which is connected to a thyristor DC high-voltage switch circuit 8. The thyristor DC high-voltage switch circuit 8 is connected to the linked tripping switch 2, the power output circuit 3 is connected to the phase loss detection circuit 6, the phase loss detection circuit 6 is connected to the tripping negative current amplification trigger circuit 7, and the high-voltage DC circuit 4 is connected to the thyristor DC high-voltage switch circuit 8;

[0139] The tripping negative current amplifying trigger circuit 7 is connected to a phase-loss signal lamp 9;

[0140] The power input circuit 1 includes a live wire L1 and a neutral wire N1 for power input;

[0141] The linked trip switch 2 includes a linked switch K1, a linked switch K2, and a trip electromagnetic coil VH. The live wire L1 and the neutral wire N1 are respectively connected to the linked switch K1 and the linked switch K2. The trip electromagnetic coil VH is magnetically connected to the linked switch K1 and the linked switch K2 as a whole, and is used to control the conduction and tripping of the two linked switches. The linked switch K1, the linked switch K2, and the trip electromagnetic coil VH constitute a trip linkage device QP as a whole.

[0142] The power output circuit 3 includes a live wire L11 and a neutral wire N11 for power output, and the live wire L11 and the neutral wire N11 are connected to the output ends of the corresponding interlocking switches K1 and K2;

[0143] The high-voltage DC circuit 4 includes a diode D9, a diode D10, a diode D12, and a diode D13; the cathodes of the diodes D9 and D10 are connected to one end of the tripping electromagnetic coil VH, the anode of the diode D9 is connected to the neutral line N11, and the anode of the diode D10 is connected to the live line L11; the cathode of the diode D12 is connected to the neutral line N11, the cathode of the diode D13 is connected to the live line L11, and the anodes of the diodes D12 and D13 are connected to the circuit neutral line E;

[0144] The low-voltage DC voltage stabilizing circuit 5 includes a resistor R6, a Zener diode W1, and a Zener diode W2, which are connected in series in sequence. One end of the resistor R6 is connected to one end of the tripping electromagnetic coil VH, the positive electrode of the Zener diode W2 is connected to the circuit neutral line E, the other end of the resistor R6 and the negative electrode of the Zener diode W1 are connected to pin 3 of the photoelectric switch EDK3, and the positive electrode of the Zener diode W1 and the negative electrode of the Zener diode W2 are connected to the c-pole of the NPN transistor;

[0145] The phase loss detection circuit 6 includes a resistor R5, a diode D7, and a photoelectric switch EDK3;

[0146] One end of the resistor R5 is connected to the live wire L11, and the other end is connected to the anode of the diode D7. The cathode of the diode D7 is connected to pin 1 of the photoelectric switch EDK3. Pin 2 of the photoelectric switch EDK3 is connected to the neutral wire N11. Pin 3 of the photoelectric switch EDK3 is connected to one end of the resistor R6 and the cathode of the voltage-stabilizing diode W1. Pin 4 of the photoelectric switch EDK3 is connected to the resistor R7.

[0147] The trip negative current amplification trigger circuit 7 includes a capacitor C2, a capacitor C3, a resistor R1, a resistor R7, a resistor R8, a diode D1, a PNP transistor, and an NPN transistor;

[0148] One end of the resistor R7 is connected to the 4th pin of the photoelectric switch EDK3, and the other end is connected to the b-pole of the NPN transistor and the resistor R8, and the other end of the resistor R8 is connected to the circuit neutral line E;

[0149] The c-pole of the NPN transistor is connected to the positive electrode of the Zener diode W1 and the negative electrode of the Zener diode W2, the e-pole of the NPN transistor is connected to the positive electrode of the diode D1, one end of the resistor R1, the b-pole of the PNP transistor, and one end of the capacitor C2, the b-pole of the PNP transistor is connected to one end of the capacitor C2, the e-pole of the PNP transistor is connected to the negative electrode of the diode D1 and one end of the capacitor C3, the c-pole of the PNP transistor is connected to the G-pole of the thyristor BT1, and the other end of the capacitor C2, the other end of the resistor R1, and the other end of the capacitor C3 are connected to the circuit neutral line E;

[0150] The thyristor DC high-voltage switch circuit 8 includes a thyristor BT1 and a capacitor C1. The thyristor BT1 includes a G pole, a K pole, and an A pole. The C pole of the PNP transistor is connected to the G pole of the thyristor BT1, one end of the capacitor C1 is connected to the G pole of the thyristor BT1, and the other end of the capacitor C1 is connected to the circuit neutral line E. The K pole of the thyristor BT1 is connected to the circuit neutral line E, and the A pole of the thyristor BT1 is connected to the other end of the tripping electromagnetic coil VH.

[0151] The phase loss signal lamp 9 includes a resistor R2 and a light emitting diode DE, which are connected in series. The positive electrode of the light emitting diode DE is connected to the e-pole of the NPN transistor, and the negative electrode is connected to the resistor R2. The other end of the resistor R2 is connected to the circuit neutral line E.

[0152] Working process:

[0153] Under normal circumstances, power is input from the power input circuit and output from the power output circuit via the interlocking trip switch. Interlocking switches K1 and K2 are magnetically closed and turned on by the trip electromagnetic coil VH. This high-voltage AC power is converted into a high-voltage DC voltage via diodes D9, D10, D12, and D13. The high-voltage DC power supply is obtained from the trip electromagnetic coil VH, one end of the resistor R6, and the cathode of the diodes D9 and D10. The anodes of the diodes D12 and D13 and the circuit neutral line E obtain a high-voltage DC negative voltage.

[0154] The resistor R5, diode D7 and photoelectric switch EDK3 form a phase loss detection circuit;

[0155] The voltage and current of the live wire L11 pass through resistor R5, diode D7, and photoelectric switch EDK3. Pins 1 and 2 of the photoelectric switch EDK3 both have current flowing through them and return to N11. Therefore, pins 3 and 4 of the photoelectric switch EDK3 both conduct current, causing the low-voltage DC positive voltage at the cathode of the Zener diode W1 to be input through pin 3 and output through pin 4 of the photoelectric switch EDK3 and connected to resistor R7. The other end of resistor R7 is connected to the b-pole of the NPN transistor in the trip negative current amplification trigger circuit. The c-pole and e-pole of the NPN transistor are conductive, causing the low-voltage DC positive voltage at the cathode of the Zener diode W2 to be transmitted to the anode of the diode D1, resistor R1, capacitor C2, and the b-pole of the PNP transistor. Since the b-pole of the PNP transistor can only work with a negative voltage input, the PNP transistor does not work, and the c-pole and e-pole of the PNP transistor are not conductive.

[0156] When the voltage of the live wire L11 of the power output circuit is lower than the set value (the voltage lower than the set value is regarded as no power output, for example: the normal voltage is 220V, and lower than 30V is regarded as no power passing, but there is power passing), the photoelectric switch of the corresponding phase loss detection circuit does not conduct because it does not reach the starting voltage (for example: the starting voltage of the photoelectric switch EDK3 is greater than 30V, and it does not work if it is lower than 30V; that is: pins 1 and 2 of the photoelectric switch EDK1 are not conducting, and the current between pins 3 and 4 is disconnected), the tripping negative current amplification trigger circuit 7 does not obtain a positive voltage, no power passes through the resistor R7, the NPN transistor does not work, and the C pole of the NPN transistor is connected to the When the e-pole is not conducting, the b-pole of the PNP transistor changes from a positive potential to a negative potential, and the PNP transistor works. The c-pole and the e-pole of the PNP transistor are conducting, and the positive voltage of the capacitor C3 is sent to the G-pole of the thyristor BT1 through the c-pole and the e-pole of the PNP transistor. The G-pole of the thyristor BT1 is triggered by the positive voltage, and the K-pole and the A-pole of the thyristor BT1 are conducting. The coil of the tripping electromagnetic coil VH receives a rectified high-voltage current, and the interlocking switches K1 and K2 are tripped. The capacitors C1 and C2 provide the instantaneous electric energy required for the triggering, so that the trigger circuit works stably. The low-voltage electricity of the live wire L11 provides electric energy for the tripping electromagnetic coil VH.

[0157] The light-emitting diode DE is used to indicate the phase loss signal. If it is on, it is normal, and if it is off, it means the phase is lost. The resistor R2 is the current limiting resistor of the light-emitting diode DE.

[0158] Example 6:

[0159] like Figure 2 、 Figure 8 As shown: An AC switching circuit, this circuit is a four-in-one tripping switch with single-phase phase loss, power outage, leakage, and overload protection, including a power input circuit 1, a linked tripping switch 2, a leakage tripping detection induction voltage output circuit 21, and a power output circuit 3. The power input circuit 1 is connected to the linked tripping switch 2, the linked tripping switch 2 is connected to the leakage tripping detection induction voltage output circuit 21, and the leakage tripping detection induction voltage output circuit 21 is connected to the power output circuit 3. The power output circuit 3 is connected to a high-voltage DC circuit 4, and the high-voltage DC circuit 4 is connected to a low-voltage DC voltage stabilizing circuit 5. The low-voltage DC voltage stabilizing circuit 5 is respectively connected to a phase loss detection circuit 6 and a tripping negative current amplification trigger circuit 7, the tripping negative current amplification trigger circuit 7 is connected to an anti-series interference circuit 71, the anti-series interference circuit 71 is connected to a thyristor DC high-voltage switch circuit 8, the leakage tripping induced voltage output circuit 21 is connected to the anti-series interference circuit 71, the thyristor DC high-voltage switch circuit 8 is connected to the linked tripping switch 2, the power output circuit 3 is connected to the phase loss detection circuit 6, the phase loss detection circuit 6 is connected to the tripping negative current amplification trigger circuit 7, and the high-voltage DC circuit 4 is connected to the thyristor DC high-voltage switch circuit 8;

[0160] The tripping negative current amplifying trigger circuit 7 is connected to a phase-loss signal lamp 9;

[0161] The power input circuit 1 includes a live wire L1 and a neutral wire N1 for power input;

[0162] The linked trip switch 2 includes a linked switch K1, a linked switch K2, and a trip electromagnetic coil VH. The live wire L1 and the neutral wire N1 are respectively connected to the linked switch K1 and the linked switch K2. The trip electromagnetic coil VH is magnetically connected to the linked switch K1 and the linked switch K2 as a whole, and is used to control the conduction and tripping of the two linked switches. The linked switch K1, the linked switch K2, and the trip electromagnetic coil VH constitute a trip linkage device QP as a whole.

[0163] The power output circuit 3 includes an overload electromagnetic coil AH, an overload electromagnetic coil BH, a live wire L11, and a neutral wire N11 for power output. The linkage switches K1 and K2 are connected to one end of the corresponding overload electromagnetic coil AH and overload electromagnetic coil BH, and the other ends of the overload electromagnetic coil AH and overload electromagnetic coil BH are connected to the corresponding live wire L11 and neutral wire N11 for output.

[0164] The leakage tripping induction voltage output circuit 21 includes a voltage induction magnetic ring TE, a leakage detection coil TA, a voltage induction coil TC, a leakage detection switch K4, a resistor R9, and a resistor R10;

[0165] The live wire L11 and the neutral wire N11 pass through the voltage induction magnetic ring TE; the leakage detection coil TA is wound around the voltage induction magnetic ring TE; the voltage induction coil TC is wound around the voltage induction magnetic ring TE; the voltage induction coil TC is relatively far away from the other end of the leakage detection coil TA;

[0166] One end of the leakage detection switch K4 is connected to the neutral line N11, and the other end is connected to one end of the leakage detection coil TA, the other end of the leakage detection coil TA is connected to one end of the resistor R10, and the other end of the resistor R10 is connected to the live line L11;

[0167] Pin 2 of the voltage induction coil TC is connected to the circuit neutral line E, and pin 1 of the voltage induction coil TC is connected to one end of the resistor R9;

[0168] The anti-crosstalk circuit 71 includes a diode D14 and a diode D15. The other end of the resistor R9 is connected to the anode of the diode D14, the cathode of the diode D14 is connected to the G electrode of the thyristor BT1, the anode of the diode D15 is connected to the C electrode of the PNP transistor, and the cathode of the diode D15 is connected to the G electrode of the thyristor BT1.

[0169] The high-voltage DC circuit 4 includes a diode D9, a diode D10, a diode D12, and a diode D13; the cathodes of the diodes D9 and D10 are connected to one end of the tripping electromagnetic coil VH, the anode of the diode D9 is connected to the neutral line N11, and the anode of the diode D10 is connected to the live line L11; the cathode of the diode D12 is connected to the neutral line N11, the cathode of the diode D13 is connected to the live line L11, and the anodes of the diodes D12 and D13 are connected to the circuit neutral line E;

[0170] The positive electrode of the capacitor C4 is connected to the tripping electromagnetic coil VH, and the negative electrode is connected to the circuit neutral line E;

[0171] The low-voltage DC voltage stabilizing circuit 5 includes a resistor R6, a Zener diode W1, and a Zener diode W2, which are connected in series in sequence. One end of the resistor R6 is connected to one end of the tripping electromagnetic coil VH, the positive electrode of the Zener diode W2 is connected to the circuit neutral line E, the other end of the resistor R6 and the negative electrode of the Zener diode W1 are connected to pin 3 of the photoelectric switch EDK3, and the positive electrode of the Zener diode W1 and the negative electrode of the Zener diode W2 are connected to the c-pole of the NPN transistor;

[0172] The phase loss detection circuit 6 includes a resistor R5, a diode D7, and a photoelectric switch EDK3;

[0173] One end of the resistor R5 is connected to the live wire L11, and the other end is connected to the anode of the diode D7 and the cathode of the diode D6. The cathode of the diode D7 is connected to pin 1 of the photoelectric switch EDK3, pin 2 of the photoelectric switch EDK3 is connected to the neutral wire N11, pin 3 of the photoelectric switch EDK3 is connected to one end of the resistor R6 and the cathode of the voltage-stabilizing diode W1, and pin 4 of the photoelectric switch EDK3 is connected to the resistor R7.

[0174] The trip negative current amplification trigger circuit 7 includes a capacitor C2, a capacitor C3, a resistor R1, a resistor R7, a resistor R8, a diode D1, a PNP transistor, and an NPN transistor;

[0175] One end of the resistor R7 is connected to the 4th pin of the photoelectric switch EDK3, and the other end is connected to the b-pole of the NPN transistor and the resistor R8, and the other end of the resistor R8 is connected to the circuit neutral line E;

[0176] The c-pole of the NPN transistor is connected to the positive electrode of the Zener diode W1 and the negative electrode of the Zener diode W2, the e-pole of the NPN transistor is connected to the positive electrode of the diode D1, one end of the resistor R1, the b-pole of the PNP transistor, and one end of the capacitor C2, the b-pole of the PNP transistor is connected to one end of the capacitor C2, the e-pole of the PNP transistor is connected to the negative electrode of the diode D1 and one end of the capacitor C3, the c-pole of the PNP transistor is connected to the G-pole of the thyristor BT1, and the other end of the capacitor C2, the other end of the resistor R1, and the other end of the capacitor C3 are connected to the circuit neutral line E;

[0177] The thyristor DC high-voltage switch circuit 8 includes a thyristor BT1 and a capacitor C1. The thyristor BT1 includes a G pole, a K pole, and an A pole. The C pole of the PNP transistor is connected to the positive pole of the diode D15, the negative pole of the diode D15 is connected to the G pole of the thyristor BT1, one end of the capacitor C1 is connected to the G pole of the thyristor BT1, and the other end of the capacitor C1 is connected to the circuit neutral line E. The K pole of the thyristor BT1 is connected to the circuit neutral line E, and the A pole of the thyristor BT1 is connected to the other end of the tripping electromagnetic coil VH.

[0178] The phase loss signal lamp 9 includes a resistor R2 and a light emitting diode DE, which are connected in series. The positive electrode of the light emitting diode DE is connected to the e-pole of the NPN transistor, and the negative electrode is connected to the resistor R2. The other end of the resistor R2 is connected to the circuit neutral line E.

[0179] The phase loss tripping principle and working process of this embodiment are the same as those of embodiment 5;

[0180] This embodiment differs from Example 2 in that the live wires L2, L3, L21, and L31 are missing, a linkage switch K3 is missing, the diodes D8 and D11 are missing, two groups of phase loss detection circuits are missing (i.e., the diodes D2, D3, resistor R3, photoelectric switch EDK1, diode D4, diode D5, resistor R4, photoelectric switch EDK2, and diode D6 are missing), and a neutral wire N1 and a neutral wire N11 are added; however, the principles of the working process of the electronic components for power outage, leakage tripping, and overload protection are the same as those of Example 2.

Claims

1. An AC switching circuit, comprising a power input circuit (1), a linked trip switch (2), a leakage tripping induced voltage output circuit (21), and a power output circuit (3), characterized in that: The power input circuit (1) is connected to the interlocking trip switch (2), the interlocking trip switch (2) is connected to the leakage tripping induction voltage output circuit (21), the leakage tripping induction voltage output circuit (21) is connected to the power output circuit (3), the power output circuit (3) is connected to the high-voltage DC circuit (4), the high-voltage DC circuit (4) is connected to the low-voltage DC voltage stabilizing circuit (5), the low-voltage DC voltage stabilizing circuit (5) is respectively connected to the phase loss detection circuit (6) and the tripping negative current amplification trigger circuit (7), the tripping negative current amplification trigger The circuit (7) is connected to an anti-series interference circuit (71), the anti-series interference circuit (71) is connected to a thyristor DC high-voltage switch circuit (8), the leakage tripping induction voltage output circuit (21) is connected to the anti-series interference circuit (71), the thyristor DC high-voltage switch circuit (8) is connected to the linked tripping switch (2), the power output circuit (3) is connected to the phase loss detection circuit (6), the phase loss detection circuit (6) is connected to the tripping negative current amplification trigger circuit (7), and the high-voltage DC circuit (4) is connected to the thyristor DC high-voltage switch circuit (8).

2. The AC switching circuit according to claim 1, wherein: The power input circuit (1) comprises a live wire L1, a live wire L2, and a live wire L3 for power input; The interlocking trip switch (2) comprises an interlocking switch K1, an interlocking switch K2, an interlocking switch K3, and a tripping electromagnetic coil VH. The live wire L1, the live wire L2, and the live wire L3 are respectively connected to the interlocking switch K1, the interlocking switch K2, and the interlocking switch K3. The tripping electromagnetic coil VH is integrally magnetically connected to the interlocking switch K1, the interlocking switch K2, and the interlocking switch K3, and is used to control the conduction and tripping of the three interlocking switches. The interlocking switch K1, the interlocking switch K2, the interlocking switch K3, and the tripping electromagnetic coil VH constitute a tripping interlocking device QP as a whole.

3. The AC switching circuit according to claim 2, wherein: The power output circuit (3) comprises an overload electromagnetic coil AH, an overload electromagnetic coil BH, an overload electromagnetic coil CH, a live wire L11, a live wire L21, and a live wire L31 for power output; a linkage switch K1, a linkage switch K2, and a linkage switch K3 are connected to one end of the corresponding overload electromagnetic coil AH, overload electromagnetic coil BH, and overload electromagnetic coil CH; and the other ends of the overload electromagnetic coil AH, overload electromagnetic coil BH, and overload electromagnetic coil CH are connected to the corresponding live wire L11, live wire L21, and live wire L31 for output.

4. The AC switching circuit according to claim 3, wherein: The leakage tripping induction voltage output circuit (21) comprises a voltage induction magnetic ring TE, a leakage detection coil TA, a voltage induction coil TC, a leakage detection switch K4, a resistor R9, and a resistor R10; The live wires L11, L21, and L31 pass through the voltage induction magnetic ring TE; the leakage detection coil TA is wound around the voltage induction magnetic ring TE; the voltage induction coil TC is wound around the voltage induction magnetic ring TE; the voltage induction coil TC is located at the other end of the leakage detection coil TA, which is farther away; One end of the leakage detection switch K4 is connected to the live wire L21, and the other end is connected to one end of the leakage detection coil TA, the other end of the leakage detection coil TA is connected to one end of the resistor R10, and the other end of the resistor R10 is connected to the live wire L11; Pin 2 of the voltage induction coil TC is connected to the circuit neutral line E, and pin 1 of the voltage induction coil TC is connected to one end of the resistor R9.

5. The AC switching circuit according to claim 4, wherein: The anti-crosstalk circuit (71) includes a diode D14 and a diode D15, the other end of the resistor R9 is connected to the positive electrode of the diode D14, the negative electrode of the diode D14 is connected to the G electrode of the thyristor BT1, the positive electrode of the diode D15 is connected to the C electrode of the PNP transistor, and the negative electrode of the diode D15 is connected to the G electrode of the thyristor BT1.

6. The AC switching circuit according to claim 5, characterized in that: The high-voltage direct current circuit (4) comprises a diode D8, a diode D9, a diode D10, a diode D11, a diode D12, and a diode D13; the cathodes of the diodes D8, D9, and D10 are connected to one end of the tripping electromagnetic coil VH, the anode of the diode D8 is connected to the live wire L31, the anode of the diode D9 is connected to the live wire L21, and the anode of the diode D10 is connected to the live wire L11; the cathode of the diode D11 is connected to the live wire L31, the cathode of the diode D12 is connected to the live wire L21, the cathode of the diode D13 is connected to the live wire L11, and the anodes of the diodes D11, D12, and D13 are connected to the circuit neutral line E.

7. The AC switching circuit according to claim 6, wherein: The low-voltage DC voltage stabilizing circuit (5) comprises a resistor R6, a voltage stabilizing diode W1, and a voltage stabilizing diode W2, which are connected in series in sequence. The end of the resistor R6 is connected to one end of the tripping electromagnetic coil VH, the positive electrode of the voltage stabilizing diode W2 is connected to the circuit neutral line E, the other end of the resistor R6 and the negative electrode of the voltage stabilizing diode W1 are connected to the 3rd pin of the photoelectric switch EDK3, and the positive electrode of the voltage stabilizing diode W1 and the negative electrode of the voltage stabilizing diode W2 are connected to the C pole of the NPN transistor.

8. The AC switching circuit according to claim 7, wherein: The phase loss detection circuit (6) includes a diode D2, a diode D3, a resistor R3, a photoelectric switch EDK1, a diode D4, a diode D5, a resistor R4, a photoelectric switch EDK2, a resistor R5, a diode D6, a diode D7, and a photoelectric switch EDK3; One end of the resistor R3 is connected to the live wire L31, and the other end is connected to the anode of the diode D3 and the cathode of the diode D2. The cathode of the diode D3 is connected to pin 1 of the photoelectric switch EDK1, pin 2 of the photoelectric switch EDK1 is connected to the anode of the diode D2, and pin 4 of the photoelectric switch EDK1 is connected to the resistor R7. One end of the resistor R4 is connected to the live wire L21, and the other end is connected to the anode of the diode D5 and the cathode of the diode D4. The cathode of the diode D5 is connected to pin 1 of the photoelectric switch EDK2, the pin 2 of the photoelectric switch EDK2 is connected to the anode of the diode D4, and the pin 4 of the photoelectric switch EDK2 is connected to the pin 3 of the photoelectric switch EDK1. One end of the resistor R5 is connected to the live wire L11, and the other end is connected to the anode of the diode D7 and the cathode of the diode D6. The cathode of the diode D7 is connected to pin 1 of the photoelectric switch EDK3. Pin 2 of the photoelectric switch EDK3 is connected to the anodes of the diodes D2, D4, and D6. Pin 3 of the photoelectric switch EDK3 is connected to one end of the resistor R6 and the cathode of the voltage-stabilizing diode W1. Pin 4 of the photoelectric switch EDK3 is connected to pin 3 of the photoelectric switch EDK2.

9. The AC switching circuit according to claim 8, characterized in that: The trip negative current amplification trigger circuit (7) comprises a capacitor C2, a capacitor C3, a capacitor C4, a resistor R1, a resistor R7, a resistor R8, a diode D1, a PNP transistor, and an NPN transistor; One end of the resistor R7 is connected to the 4th pin of the photoelectric switch EDK1, and the other end is connected to the b-pole of the NPN transistor and the resistor R8, and the other end of the resistor R8 is connected to the circuit neutral line E; The positive electrode of the capacitor C4 is connected to the tripping electromagnetic coil VH, and the negative electrode is connected to the circuit neutral line E; The c-pole of the NPN transistor is connected to the positive pole of the Zener diode W1 and the negative pole of the Zener diode W2, the e-pole of the NPN transistor is connected to the positive pole of the diode D1, one end of the resistor R1, the b-pole of the PNP transistor, and one end of the capacitor C2, the b-pole of the PNP transistor is connected to one end of the capacitor C2, the e-pole of the PNP transistor is connected to the negative pole of the diode D1 and one end of the capacitor C3, the c-pole of the PNP transistor is connected to the G-pole of the thyristor BT1, and the other end of the capacitor C2, the other end of the resistor R1, and the other end of the capacitor C3 are connected to the circuit neutral line E.

10. The AC switching circuit according to claim 9, characterized in that: The thyristor DC high-voltage switch circuit (8) comprises a thyristor BT1 and a capacitor C1, wherein the thyristor BT1 comprises a G pole, a K pole, and an A pole; the C pole of the PNP transistor is connected to the positive pole of the diode D15, the negative pole of the diode D15 is connected to the G pole of the thyristor BT1, one end of the capacitor C1 is connected to the G pole of the thyristor BT1, and the other end of the capacitor C1 is connected to the circuit neutral line E; the K pole of the thyristor BT1 is connected to the circuit neutral line E, and the A pole of the thyristor BT1 is connected to the other end of the tripping electromagnetic coil VH.

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