CN203850916U - A dual-channel AC power switcher - Google Patents

Abstract

The utility model discloses a dual-channel AC power switch, which comprises a control circuit, an interlock circuit, a switch control circuit connected with the interlock circuit, and a device for detecting the power supply voltages of the first AC power supply and the second AC power supply respectively. The first voltage detection circuit and the second voltage detection circuit; the first on-off control element and the second on-off control element are respectively connected in series in the power supply circuit between the first AC power supply and the second AC power supply and the load, and the first on-off control element Both the element and the second on-off control element are thyristors, the first on-off control element is triggered by the first thyristor trigger circuit, the second on-off control element is triggered by the second thyristor trigger circuit, the first controllable Both the silicon trigger circuit and the second thyristor trigger circuit are connected to the switching control circuit. The utility model has the advantages of simple circuit, reasonable design and good use effect, and can effectively solve the problems of complicated circuit, low power detection accuracy and slow switching speed existing in the existing dual-way power switching device.

Description

A dual-channel AC power switcher

technical field

The utility model belongs to the technical field of dual-channel power switching, and in particular relates to a dual-channel AC power switch.

Background technique

The dual-channel AC power switching device is a device for switching and controlling two AC power sources. One of the switched two-channel AC power sources is the normal power source, and the other is the backup power source. The power switching device automatically switches to the backup power supply so that the load can still operate normally. The dual-channel AC power switching device mainly includes a power detection circuit for detecting the power supply status of the two-way AC power supply and a switching control circuit for realizing the switching of the two-way AC power supply. The power detection circuit is the most important in the development of the AC power switcher. In the link, the real-time monitoring and fault judgment of the power supply status of the switcher are based on the power detection, and the accuracy of the power detection directly affects the performance of the switching device.

Nowadays, the hardware circuit of the dual-way AC switching device mainly has the following two problems: first, in order to improve the accuracy of power detection, it is necessary to design a complex power detection circuit, but the use of a complex power detection circuit will inevitably reduce the switching device. The reliability of the circuit affects the switching speed; second, the design of the switching control circuit is unreasonable, and the response speed of some devices is slow, which affects the switching speed. In addition, most of the currently used dual-channel AC power switchers provide reliable power for low-power IT or industrial control equipment, and are difficult to apply to power switching for high-power electrical equipment. If you want to provide power switching for high-power equipment, A dual power switch is required. To sum up, existing dual-channel AC power switching devices have problems such as complex circuits, low power detection accuracy, and slow switching speed to varying degrees.

Utility model content

The technical problem to be solved by the utility model is to provide a two-way AC power switcher for the above-mentioned deficiencies in the prior art. There are problems such as complex circuit, low power detection accuracy, and slow switching speed.

In order to solve the above technical problems, the technical solution adopted by the utility model is: a dual-channel AC power switch, characterized in that it includes a control circuit, an interlock circuit connected to the control circuit, and a switch connected to the interlock circuit A control circuit, a first voltage detection circuit for detecting the supply voltage of the first AC power supply, and a second voltage detection circuit for detecting the supply voltage of the second AC power supply, the first voltage detection circuit and the second voltage detection circuit Both are connected to the control circuit; both the first AC power supply and the second AC power supply are connected to the load, and the power supply circuit between the first AC power supply and the load is connected in series with a first on-off control element, A second on-off control element is connected in series in the power supply circuit between the second AC power supply and the load, the first on-off control element and the second on-off control element are thyristors, and the first on-off control element An on-off control element is triggered by the first thyristor trigger circuit and connected to the first thyristor trigger circuit, and the second on-off control element is triggered by the second thyristor trigger circuit and connected to the first thyristor trigger circuit. The second thyristor trigger circuit is connected, and both the first thyristor trigger circuit and the second thyristor trigger circuit are connected to the switching control circuit; the first voltage detection circuit and the second voltage detection circuit The circuits all include a rectifier circuit, a resistor divider circuit connected to the rectifier circuit and a clamp circuit connected to the resistor divider circuit; the switching control circuit includes a photoelectric isolation circuit connected to the interlock circuit and two A switch circuit that is connected to the photoelectric isolation circuit, the two switch circuits are respectively connected to the first thyristor trigger circuit and the second thyristor trigger circuit, and both of the switch circuits are triode switch circuits .

The above-mentioned dual-channel AC power switch is characterized in that: the two switch circuits are respectively a first switch circuit connected to the first thyristor trigger circuit and a first switch circuit connected to the second thyristor trigger circuit. A connected second switch circuit; the first switch circuit includes a triode Q1, the base of the triode Q1 is connected to the photoelectric isolation circuit through a resistor R7, the emitter of the triode Q1 is grounded and its collector is connected to the first A thyristor trigger circuit; the second switch circuit includes a triode Q2, the base of the triode Q2 is connected to the photoelectric isolation circuit through a resistor R8, the emitter of the triode Q2 is grounded and its collector is connected to the second SCR trigger circuit.

The above-mentioned dual-channel AC power switch is characterized in that: the control circuit is a chip LPC2214.

The above-mentioned dual-way AC power switch is characterized in that: the interlock circuit is composed of a chip 74HC125 and a chip 74HC14; the second pin and the fifth pin of the chip 74HC125 are respectively connected with the 24th pin and the first pin of the chip LPC2214 The 15 pins are connected, the 1st pin and the 10th pin of the chip 74HC125 are connected with the 2nd pin of the chip 74HC14, the 4th pin and the 13th pin of the chip 74HC125 are connected with the 6th pin of the chip 74HC14 The first and third pins of the chip 74HC14 are connected to the 82nd pin of the chip LPC2214, and the fourth and fifth pins of the chip 74HC14 are connected.

The above-mentioned dual-way AC power switch is characterized in that: the first on-off control element is composed of a first thyristor module and a second thyristor module; the first thyristor module is composed of a one-way thyristor Composed of silicon controlled rectifier G1 and G2, the cathode of the one-way thyristor G1 is connected to the anode of the one-way thyristor G2, and the connection point between the two is the connection point L1, and the anode of the one-way thyristor G1 is connected to the one-way silicon controlled rectifier G1 The cathodes of the thyristor G2 are connected, and the connection point between them is the connection point L2, and the first thyristor module is connected in series to the live line LA of the first AC power supply through the connection point L1 and the connection point L2 ; The second thyristor module is composed of one-way thyristor G3 and G4, the cathode of one-way thyristor G3 is connected to the anode of one-way thyristor G4 and the connection point between the two is a connection point N1, the anode of the one-way thyristor G3 is connected to the cathode of the one-way thyristor G4 and the junction point between them is the junction point N2, and the second thyristor module passes through the junction point N1 and the junction point N2 connected in series to the neutral line NA of the first AC power supply;

The second on-off control element is composed of a third thyristor module and a fourth thyristor module; the third thyristor module is composed of one-way thyristor G5 and G6, and the one-way thyristor G5 The cathode is connected to the anode of the one-way thyristor G6 and the junction point between them is the junction point L3, the anode of the one-way thyristor G5 is connected to the cathode of the one-way thyristor G6 and the connection point between the two is The junction point is junction point L4, and the third thyristor module is connected in series with the live wire LB of the second AC power supply through junction point L5 and junction point L6; the fourth thyristor module is controlled by a unidirectional Composed of silicon G7 and G8, the cathode of the one-way thyristor G7 is connected to the anode of the one-way thyristor G8, and the junction point between the two is the junction point N3, and the anode of the one-way thyristor G7 is connected to the one-way thyristor G8. The cathodes of the thyristor G8 are connected and the junction point between them is the junction point N4, and the fourth thyristor module is connected in series with the neutral line NB of the second AC power supply through the junction point N3 and the junction point N4 .

The above-mentioned dual-channel AC power switch is characterized in that: the two switch circuits are respectively a first switch circuit connected to the first thyristor trigger circuit and a first switch circuit connected to the second thyristor trigger circuit. A connected second switch circuit; the output terminal of the first switch circuit is A_IN, and the output terminal of the second switch circuit is B_IN;

The first thyristor trigger circuit includes a first trigger circuit connected to the first thyristor module and a second trigger circuit connected to the second thyristor module; the first trigger circuit It includes a first trigger chip connected to the one-way thyristor G1 and a second trigger chip connected to the one-way thyristor G2, both of the first trigger chip and the second trigger chip are chip MOC3083; The above-mentioned output terminal is A_IN divided into three ways, one way is connected with the first pin of the first trigger chip after passing through the resistor R16, and the other way is connected with the second pin of the second trigger chip after passing through the resistor R18 and the light-emitting diode D22. The pins are connected, and the third path is connected to the base of the triode Q3 after passing through the resistor R19; the second pin of the first trigger chip is connected to the first pin of the second trigger chip, and the first pin of the trigger chip is connected to the first pin of the second trigger chip. The second pin of the trigger chip is connected to the collector of the transistor Q3, the emitter of the transistor Q3 is grounded, the base of the transistor Q3 is connected to the cathode of the diode D23, the anode of the diode D23 is connected to the cathode of the diode D24, and the diode The anode of D24 is grounded; a resistor R17 is connected between the 4th pin and the 6th pin of the first trigger chip, and a resistor R20 is connected between the 4th pin and the 6th pin of the second trigger chip, so The 4th pin of the first trigger chip is connected with the 6th pin of the second trigger chip, and the 6th pin of the first trigger chip is connected with the control pole of the one-way thyristor G1, so The 4th pin of the second trigger chip is connected to the control pole of the one-way thyristor G2 through the resistor R21;

The second trigger circuit includes a third trigger chip connected to the one-way thyristor G3 and a fourth trigger chip connected to the one-way thyristor G4, the third trigger chip and the fourth trigger chip Both are chip MOC3083; the output terminal is A_IN divided into three ways, one way is connected to the first pin of the third trigger chip after passing through the resistor R36, and the other way is connected to the first pin of the third trigger chip after passing through the resistor R38 and the light-emitting diode D32. The second pin of the fourth trigger chip is connected, and the third circuit is connected to the base of the triode Q4 after passing through the resistor R39; the second pin of the third trigger chip is connected to the first pin of the fourth trigger chip The second pin of the fourth trigger chip is connected to the collector of the transistor Q4, the emitter of the transistor Q4 is grounded, the base of the transistor Q4 is connected to the cathode of the diode D33, and the anode of the diode D33 is connected to the cathode of the diode D34. The cathode of the diode D34 is connected to the ground, and the anode of the diode D34 is grounded; a resistor R37 is connected between the 4th pin and the 6th pin of the third trigger chip, and a resistor R37 is connected between the 4th pin and the 6th pin of the fourth trigger chip. There is a resistor R30 indirectly, the 4th pin of the third trigger chip is connected to the 6th pin of the fourth trigger chip, the 6th pin of the third trigger chip is connected to the one-way thyristor G3 The control poles are connected, and the fourth pin of the fourth trigger chip is connected to the control pole of the one-way thyristor G4 after passing through the resistor R31;

The second thyristor trigger circuit includes a third trigger circuit connected to the third thyristor module and a fourth trigger circuit connected to the fourth thyristor module; the third trigger circuit It includes a fifth trigger chip connected to the one-way thyristor G5 and a sixth trigger chip connected to the one-way thyristor G6, both of the fifth trigger chip and the sixth trigger chip are chip MOC3083; The above-mentioned output terminal is divided into three routes for B_IN, one route is connected to the first pin of the fifth trigger chip after passing through the resistor R56, and the other route is connected to the second pin of the sixth trigger chip after passing through the resistor R58 and the light-emitting diode D52. The pins are connected, and the third path is connected to the base of the transistor Q54 after passing through the resistor R59; the second pin of the fifth trigger chip is connected to the first pin of the sixth trigger chip, and the first pin of the fifth trigger chip is connected to the first pin of the sixth trigger chip. The second pin of the six-trigger chip is connected to the collector of the transistor Q54, the emitter of the transistor Q54 is grounded, the base of the transistor Q54 is connected to the cathode of the diode D53, the anode of the diode D53 is connected to the cathode of the diode D54, and the diode The anode of D54 is grounded; a resistor R57 is connected between the 4th pin and the 6th pin of the fifth trigger chip, and a resistor R50 is connected between the 4th pin and the 6th pin of the sixth trigger chip, so The 4th pin of the fifth trigger chip is connected with the 6th pin of the sixth trigger chip, and the 6th pin of the fifth trigger chip is connected with the control pole of the one-way thyristor G5, so The fourth pin of the sixth trigger chip is connected to the control pole of the one-way thyristor G6 through the resistor R51;

The fourth trigger circuit includes a seventh trigger chip connected to the one-way thyristor G7 and an eighth trigger chip connected to the one-way thyristor G8, the seventh trigger chip and the eighth trigger chip Both are chips MOC3083; the output terminal is B_IN divided into three routes, one route is connected to the first pin of the seventh trigger chip after passing through the resistor R66, and the other route is connected to the first pin of the seventh trigger chip after passing through the resistor R68 and the light emitting diode D62. The second pin of the eighth trigger chip is connected, and the third circuit is connected to the base of the triode Q64 after passing through the resistor R69; the second pin of the seventh trigger chip is connected to the first pin of the eighth trigger chip The second pin of the eighth trigger chip is connected to the collector of the transistor Q64, the emitter of the transistor Q64 is grounded, the base of the transistor Q64 is connected to the cathode of the diode D63, and the anode of the diode D63 is connected to the cathode of the diode D64. The cathode of the diode D64 is connected to the ground, and the anode of the diode D64 is grounded; a resistor R67 is connected between the 4th pin and the 6th pin of the seventh trigger chip, and a resistor R67 is connected between the 4th pin and the 6th pin of the eighth trigger chip. Indirect resistor R60, the 4th pin of the seventh trigger chip is connected to the 6th pin of the eighth trigger chip, the 6th pin of the seventh trigger chip is connected to the one-way thyristor G7 The control electrodes are connected, and the fourth pin of the eighth trigger chip is connected to the control electrode of the one-way thyristor G8 after passing through the resistor R61.

Compared with the prior art, the utility model has the following advantages:

1. The circuit is simple, the design is reasonable, the wiring is convenient, and the input cost is low.

2. The voltage detection circuit used is simple and has high detection accuracy. The voltage detection circuit is mainly composed of a rectifier circuit, a resistor divider circuit and a diode clamp circuit. First, the input AC power is converted to It is rectified into a steamed bun wave, and then divided by a resistor voltage divider circuit, and the output voltage of the resistor voltage divider circuit is clamped by a diode clamp circuit, so it has the following advantages: first, directly detect the rectified power supply, Compared with the power detection after converting the steamed bread waveform into DC, the detection speed is fast and the detection accuracy is high; second, the circuit is simple, and the influence of complex circuits on the power detection speed is avoided; third, according to the principle of resistance voltage division, the use of sliding The rheostat and fixed resistor can effectively adjust the peak value of the steamed bread waveform, which is flexible and convenient; fourth, the diode clamp circuit forms a protection circuit, which limits the peak voltage of the steamed bread waveform within a certain range (specifically 0-3.3V), which can effectively Protect the back-stage circuit and avoid damage to the back-stage circuit due to the high input AC voltage of the front stage.

3. The switching control circuit used is mainly composed of photoelectric isolation circuit and triode, which has the following advantages: first, the circuit is simple, the design is reasonable and the wiring is convenient; second, the signal output by the previous stage circuit (that is, the interlock circuit) is small voltage signal, and the signal required by the subsequent stage circuit (i.e., the thyristor trigger circuit) is a large voltage signal. Through this switching control circuit, the conversion from small voltage signal to large voltage signal can be realized, which well connects the previous stage circuit and the latter stage. circuit; third, use the photoelectric coupling circuit to realize photoelectric isolation, and prevent the front-stage circuit from damaging the post-stage circuit; fourth, use the triode to control the opening and closing of the post-stage circuit. Compared with the use of relays, the operating frequency response is faster, which is helpful It is easy to realize fast switching, and has low cost and strong practicability.

4. The adopted interlock circuit is mainly composed of a NOT gate integrated circuit chip and a three-state gate integrated circuit chip. In actual use, when two AC power sources are connected at the same time and there is a phase difference and voltage difference between them, it will cause a short circuit of the power supply, which will bring disastrous consequences to the power supply safety. Therefore, it is necessary to design an interlock circuit to prevent the two AC power sources from turn on at the same time. The interlocking circuit adopted in the utility model has the following advantages: first, the circuit is simple, and the wiring is convenient; second, the interlocking of dual-way control is realized by using a non-gate integrated circuit and a three-state gate integrated circuit, which is safe and reliable, and controls the response speed Fast, and can effectively avoid the simultaneous conduction of two channels; third, the use of tri-state gate integrated circuits enhances the signal drive capability of the module, which is conducive to suppressing the interference on the signal transmission line.

5. It has good use effect and high practical value. It has the advantages of high power detection accuracy and fast switching speed, and is suitable for power switching of high-power electrical equipment. It has strong practicability and is easy to promote and use.

To sum up, the utility model has a simple circuit, reasonable design and good use effect, and can effectively solve the existing problems of the existing dual-channel AC power switching device, such as complicated circuits, low power detection accuracy, slow switching speed, and low switching reliability. Bad question.

The technical solutions of the present utility model will be further described in detail through the drawings and embodiments below.

Description of drawings

Fig. 1 is the block diagram of circuit principle of the utility model.

Fig. 2 is the circuit schematic diagram of the utility model control circuit.

Fig. 3 is a schematic circuit diagram of the first voltage detection circuit and the second voltage detection circuit of the present invention.

Fig. 4 is the circuit schematic diagram of the utility model interlock circuit.

Fig. 5 is a schematic circuit diagram of the switching control circuit of the present invention.

FIG. 6 is a schematic circuit diagram of the first thyristor trigger circuit of the present invention.

FIG. 7 is a schematic circuit diagram of the second thyristor trigger circuit of the present invention.

Explanation of reference signs:

1—control circuit; 1-1—first voltage detection circuit; 1-2—second voltage detection circuit;

2—load; 3-1—the first on-off control element; 3-2—the second on-off control element;

4—interlock circuit; 5-1—the first thyristor trigger circuit;

5-2—Second thyristor trigger circuit; 6—Switching control circuit.

Detailed ways

As shown in Figure 1, the utility model includes a control circuit 1, an interlock circuit 4 connected to the control circuit 1, a switching control circuit 6 connected to the interlock circuit 4, and a device for detecting the supply voltage of the first AC power supply. The first voltage detection circuit 1-1 and the second voltage detection circuit 1-2 for detecting the supply voltage of the second AC power supply, the first voltage detection circuit 1-1 and the second voltage detection circuit 1-2 are both connected to The control circuit 1 is connected. Both the first AC power supply and the second AC power supply are connected to the load 2, a first on-off control element is connected in series in the power supply circuit between the first AC power supply and the load 2, and the second AC power supply The power supply circuit between the power supply and the load 2 is connected in series with a second on-off control element, both of the first on-off control element and the second on-off control element are thyristors, and the first on-off control element The element is triggered by the first thyristor trigger circuit and connected to the first thyristor trigger circuit, and the second on-off control element is triggered by the second thyristor trigger circuit and connected to the second thyristor trigger circuit. The thyristor trigger circuit is connected, and both the first thyristor trigger circuit and the second thyristor trigger circuit are connected to the switching control circuit 6 . Both the first voltage detection circuit 1-1 and the second voltage detection circuit 1-2 include a rectification circuit, a resistor divider circuit connected to the rectifier circuit, and a clamp circuit connected to the resistor divider circuit. The switching control circuit 6 includes a photoelectric isolation circuit connected with the interlock circuit 4 and two switch circuits that are all connected with the photoelectric isolation circuit, and the two switch circuits are respectively connected to the first thyristor trigger circuit and the first SCR trigger circuit. The second thyristor trigger circuit is connected, and the two switching circuits are triode switching circuits.

As shown in FIG. 2 , in this embodiment, the control circuit 1 is a chip LPC2214.

In actual use, the control circuit 1 can also use other types of control chips, which have the same function and function as the control chip used in the existing dual-way AC power switching device, only for the first voltage detection circuit 1- 1 and the voltage value detected by the second voltage detection circuit 1-2 to judge, and output a switching control signal to the outside.

As shown in Figure 3, in this embodiment, the rectification circuit of the first voltage detection circuit 1-1 is a bridge rectification circuit D20, and the two AC input ends of the bridge rectification circuit D20 are respectively connected to the first AC power supply The live line LA and the neutral line NA are connected; the first voltage detection circuit 1-1 is composed of a sliding rheostat R1 and a resistor R2, and the positive output terminal of the bridge rectifier D20 is connected to a fixed end of the sliding rheostat R1 after passing through the resistor R2. Both the sliding end and the other fixed end of the sliding rheostat R1 are grounded, and the negative output end of the bridge rectifier D20 is grounded. The clamping circuit of the first voltage detection circuit 1-1 is composed of diodes D5 and D6. The cathode of diode D5 is connected to the +3.3V power supply terminal and its anode is connected to the cathode of diode D6. The anode of diode D6 is grounded. The connection point between the sliding rheostat R1 and the resistor R2 is connected to the connection point between the anode of the diode D5 and the cathode of the diode D6. A capacitor C5 is connected between the anode of the diode D5 and the anode of the diode D6. The connection point between the anode of the diode D5 and the cathode of the diode D6 is connected to the 23rd pin of the chip LPC2214.

The rectifier circuit of the second voltage detection circuit 1-2 is a bridge rectifier circuit D21, and the two AC input terminals of the bridge rectifier circuit D21 are respectively connected to the live wire LB and the neutral wire NB of the second AC power supply; The second voltage detection circuit 2-1 is composed of a sliding rheostat R3 and a resistor R4. The positive output terminal of the bridge rectifier D21 is connected to a fixed end of the sliding rheostat R3 after passing through the resistor R4, and the sliding end of the sliding rheostat R3 is connected to the other fixed end. Both are grounded, and the negative output end of the bridge rectifier D21 is grounded. The clamping circuit of the second voltage detection circuit 1-2 is composed of diodes D7 and D8. The cathode of the diode D7 is connected to the +3.3V power supply terminal and its anode is connected to the cathode of the diode D8. The anode of the diode D8 is grounded. The connection point between the sliding rheostat R3 and the resistor R4 is connected to the connection point between the anode of the diode D7 and the cathode of the diode D8. A capacitor C8 is connected between the anode of the diode D7 and the anode of the diode D7. The connection point between the anode of the diode D7 and the cathode of the diode D8 is connected to the 25th pin of the chip LPC2214.

As shown in FIG. 5, the two switch circuits are respectively a first switch circuit connected to the first thyristor trigger circuit and a second switch circuit connected to the second thyristor trigger circuit; The first switch circuit includes a triode Q1, the base of the triode Q1 is connected to the photoelectric isolation circuit through a resistor R7, the emitter of the triode Q1 is grounded and its collector is connected to the first thyristor trigger circuit. The second switch circuit includes a triode Q2, the base of the triode Q2 is connected to the photoelectric isolation circuit through a resistor R8, the emitter of the triode Q2 is grounded and its collector is connected to the second thyristor trigger circuit.

In this embodiment, the photoelectric isolation circuit is a chip TLP521-2.

In actual wiring, the first pin of the chip TLP521-2 is connected to the +3.3V power supply terminal after passing through the resistor R5, and the third pin of the chip TLP521-2 is connected to the +3.3V power supply terminal after passing through the resistor R6. The 2nd pin and the 4th pin of the chip TLP521-2 are respectively connected with the 3rd pin and the 6th pin of the chip 74HC125, and the 8th pin of the chip TLP521-2 is connected with the base of the transistor Q1 after passing through the resistor R7 Connected, the 8th pin of the chip TLP521-2 is connected to the +15V power supply terminal through the resistor R9, the collector of the transistor Q1 is connected to the +15V power supply terminal through the resistor R11, and the collector of the transistor Q1 is its output terminal, and the chip TLP521- The 5th and 7th pins of 2 are grounded.

The sixth pin of the chip TLP521-2 is connected to the base of the transistor Q2 through the resistor R8, the sixth pin of the chip TLP521-2 is connected to the +15V power supply terminal through the resistor R10, and the collector of the transistor Q2 The +15V power supply terminal is connected after the resistor R12, and the collector of the triode Q2 is its output terminal.

As shown in Fig. 6 and Fig. 7, the first on-off control element is composed of a first thyristor module 3-1 and a second thyristor module 3-2. The first thyristor module 3-1 is composed of one-way thyristor G1 and G2, the cathode of one-way thyristor G1 is connected to the anode of one-way thyristor G2, and the connection point between the two is Connection point L1, the anode of the one-way thyristor G1 is connected to the cathode of the one-way thyristor G2 and the connection point between the two is the connection point L2, and the first thyristor module 3-1 passes through the connection point L1 and connection point L2 are connected in series to the live line LA of the first AC power supply. The second thyristor module 3-2 is composed of one-way thyristor G3 and G4, the cathode of one-way thyristor G3 is connected to the anode of one-way thyristor G4 and the connection point between the two is Connection point N1, the anode of the one-way thyristor G3 is connected to the cathode of the one-way thyristor G4 and the connection point between the two is the connection point N2, and the second thyristor module 3-2 passes through the connection point N1 and connection point N2 are connected in series to the neutral line NA of the first AC power supply.

The second on-off control element is composed of a third thyristor module 3-3 and a fourth thyristor module 3-4. The third thyristor module 3-3 is composed of one-way thyristor G5 and G6, the cathode of one-way thyristor G5 is connected to the anode of one-way thyristor G6 and the connection point between the two is Connection point L3, the anode of the one-way thyristor G5 is connected to the cathode of the one-way thyristor G6 and the connection point between the two is the connection point L4, and the third thyristor module 3-3 passes through the connection point L5 and connection point L6 are connected in series in the live line LB of the second AC power supply. The fourth thyristor module 3-4 is composed of one-way thyristor G7 and G8, the cathode of one-way thyristor G7 is connected to the anode of one-way thyristor G8 and the connection point between the two is Connection point N3, the anode of the one-way thyristor G7 is connected to the cathode of the one-way thyristor G8 and the connection point between the two is the connection point N4, and the fourth thyristor module 3-4 passes through the connection point N3 and connection point N4 are connected in series in the neutral line NB of the second AC power supply.

In this embodiment, the two switch circuits are respectively a first switch circuit connected to the first thyristor trigger circuit and a second switch circuit connected to the second thyristor trigger circuit; The output terminal of the first switch circuit is A_IN, and the output terminal of the second switch circuit is B_IN.

The first thyristor trigger circuit includes a first trigger circuit 5-1 connected to the first thyristor module 3-1 and a second trigger circuit connected to the second thyristor module 3-2. Trigger circuit 5-2. The first trigger circuit 5-1 includes a first trigger chip connected to the one-way thyristor G1 and a second trigger chip connected to the one-way thyristor G2, and the first trigger chip and the first trigger chip are connected to the one-way thyristor G2. The two trigger chips are all chip MOC3083. The output terminal is divided into three ways for A_IN, one way is connected to the first pin of the first trigger chip after passing through the resistor R16, and the other way is connected to the first pin of the second trigger chip after passing through the resistor R18 and the light-emitting diode D22. 2 pins are connected, and the third path is connected to the base of the triode Q3 after passing through the resistor R19; the second pin of the first trigger chip is connected to the first pin of the second trigger chip, and the The second pin of the second trigger chip is connected to the collector of the transistor Q3, the emitter of the transistor Q3 is grounded, the base of the transistor Q3 is connected to the cathode of the diode D23, and the anode of the diode D23 is connected to the cathode of the diode D24. The anode of the diode D24 is grounded; a resistor R17 is connected between the 4th pin and the 6th pin of the first trigger chip, and a resistor R20 is connected between the 4th pin and the 6th pin of the second trigger chip, The 4th pin of the first trigger chip is connected to the 6th pin of the second trigger chip, and the 6th pin of the first trigger chip is connected to the control pole of the one-way thyristor G1, The fourth pin of the second trigger chip is connected to the control electrode of the one-way thyristor G2 through the resistor R21.

The second trigger circuit 5-2 includes a third trigger chip connected to the one-way thyristor G3 and a fourth trigger chip connected to the one-way thyristor G4, the third trigger chip and the first The four trigger chips are chip MOC3083. The output terminal is divided into three ways for A_IN, one way is connected to the first pin of the third trigger chip after passing through the resistor R36, and the other way is connected to the first pin of the fourth trigger chip after passing through the resistor R38 and the light-emitting diode D32. 2 pins are connected, and the third circuit is connected to the base of the triode Q4 after passing through the resistor R39; the second pin of the third trigger chip is connected to the first pin of the fourth trigger chip, and the The second pin of the fourth trigger chip is connected to the collector of the transistor Q4, the emitter of the transistor Q4 is grounded, the base of the transistor Q4 is connected to the cathode of the diode D33, and the anode of the diode D33 is connected to the cathode of the diode D34. The anode of the diode D34 is grounded; a resistor R37 is connected between the 4th pin and the 6th pin of the third trigger chip, and a resistor R30 is connected between the 4th pin and the 6th pin of the fourth trigger chip, The 4th pin of the third trigger chip is connected to the 6th pin of the fourth trigger chip, and the 6th pin of the third trigger chip is connected to the control pole of the one-way thyristor G3, The fourth pin of the fourth trigger chip is connected to the control pole of the one-way thyristor G4 after passing through the resistor R31;

The second SCR trigger circuit includes a third SCR trigger circuit 5-3 connected to the third SCR module 3-3 and a fourth SCR module connected to the fourth SCR module 3-4. Trigger circuit 5-4. The third trigger circuit 5-3 includes a fifth trigger chip connected to the one-way thyristor G5 and a sixth trigger chip connected to the one-way thyristor G6, the fifth trigger chip and the first The six trigger chips are chip MOC3083. The output terminal is divided into three routes for B_IN, one route is connected to the first pin of the fifth trigger chip after passing through the resistor R56, and the other route is connected to the first pin of the sixth trigger chip after passing through the resistor R58 and the light-emitting diode D52. 2 pins are connected, and the third circuit is connected to the base of the triode Q54 after passing through the resistor R59; the second pin of the fifth trigger chip is connected to the first pin of the sixth trigger chip, and the The second pin of the sixth trigger chip is connected to the collector of the transistor Q54, the emitter of the transistor Q54 is grounded, the base of the transistor Q54 is connected to the cathode of the diode D53, and the anode of the diode D53 is connected to the cathode of the diode D54. The anode of the diode D54 is grounded; a resistor R57 is connected between the 4th pin and the 6th pin of the fifth trigger chip, and a resistor R50 is connected between the 4th pin and the 6th pin of the sixth trigger chip, The 4th pin of the fifth trigger chip is connected to the 6th pin of the sixth trigger chip, and the 6th pin of the fifth trigger chip is connected to the control pole of the one-way thyristor G5, The fourth pin of the sixth trigger chip is connected to the control electrode of the one-way thyristor G6 through the resistor R51.

The fourth trigger circuit 5-4 includes a seventh trigger chip connected to the one-way thyristor G7 and an eighth trigger chip connected to the one-way thyristor G8, the seventh trigger chip and the first Eight trigger chips are chip MOC3083. The output end is B_IN divided into three routes, one route is connected to the first pin of the seventh trigger chip after passing through the resistor R66, and the other route is connected to the first pin of the eighth trigger chip after passing through the resistor R68 and the light-emitting diode D62. 2 pins are connected, and the third circuit is connected with the base of the triode Q64 after passing through the resistor R69. The second pin of the seventh trigger chip is connected to the first pin of the eighth trigger chip, the second pin of the eighth trigger chip is connected to the collector of the transistor Q64, and the emitter of the transistor Q64 The base of the transistor Q64 is connected to the cathode of the diode D63, the anode of the diode D63 is connected to the cathode of the diode D64, and the anode of the diode D64 is connected to the ground; the fourth pin and the sixth pin of the seventh trigger chip A resistor R67 is connected between them, a resistor R60 is connected between the 4th pin and the 6th pin of the eighth trigger chip, and the 4th pin of the seventh trigger chip is connected to the 6th pin of the eighth trigger chip. The pins are connected, the 6th pin of the seventh trigger chip is connected with the control pole of the one-way thyristor G7, and the fourth pin of the eighth trigger chip is connected with the one-way thyristor G8 through the resistor R61. The control poles are connected.

In actual wiring, the output terminal of the first switch circuit is the collector of the transistor Q1, and the output terminal of the second switch circuit is the collector of the transistor Q2.

As shown in Figure 4, in the present embodiment, described interlock circuit 4 is made up of chip 74HC125 and chip 74HC14; The first pin and the tenth pin of the chip 74HC125 are connected with the second pin of the chip 74HC14, the fourth pin and the thirteenth pin of the chip 74HC125 are connected with the sixth pin of the chip 74HC14 Connect, the 1st pin and the 3rd pin of the chip 74HC14 are connected with the 82nd pin of the chip LPC2214, and the 4th pin and the 5th pin of the chip 74HC14 are connected.

In actual wiring, the 7th pin of the chip 74HC125 is grounded, the 14th pin of the chip 74HC125 is connected to the +3.3V power supply, the 7th pin of the chip 74HC14 is grounded, and the 14th pin of the chip 74HC14 is connected to the +3.3V power supply connected end to end.

In this embodiment, the first on-off control element is connected in series to the live line LA of the first AC power supply, and the second on-off control element is connected in series to the live line LB of the second AC power supply.

The above are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any simple modifications, changes and equivalent structural changes made to the above embodiments according to the technical essence of the present utility model still belong to Within the scope of protection of the technical solution of the utility model.

Claims (6)

1. A two-way AC power switcher, characterized in that: comprising a control circuit (1), an interlock circuit (4) connected to the control circuit (1), a switching control circuit connected to the interlock circuit (4) circuit (6), a first voltage detection circuit (1-1) for detecting the supply voltage of the first AC power supply, and a second voltage detection circuit (1-2) for detecting the supply voltage of the second AC power supply, the Both the first voltage detection circuit (1-1) and the second voltage detection circuit (1-2) are connected to the control circuit (1); the first AC power supply and the second AC power supply are connected to the load (2 ) is connected, a first on-off control element is connected in series in the power supply circuit between the first AC power supply and the load (2), and a first on-off control element is connected in series in the power supply circuit between the second AC power supply and the load (2). There is a second on-off control element, the first on-off control element and the second on-off control element are thyristors, the first on-off control element is triggered by a first thyristor trigger circuit and its connected to the first thyristor trigger circuit, the second on-off control element is triggered by the second thyristor trigger circuit and connected to the second thyristor trigger circuit, the first Both the silicon-controlled trigger circuit and the second thyristor trigger circuit are connected to the switching control circuit (6); the first voltage detection circuit (1-1) and the second voltage detection circuit (1-2) both include A rectifier circuit, a resistor divider circuit connected to the rectifier circuit, and a clamp circuit connected to the resistor divider circuit; the switching control circuit (6) includes a photoelectric isolation circuit connected to the interlock circuit (4) and two switch circuits that are both connected to the photoelectric isolation circuit, the two switch circuits are respectively connected to the first thyristor trigger circuit and the second thyristor trigger circuit, and the two switch circuits are Triode switch circuit. 2. A dual-way AC power switcher according to claim 1, wherein the two switching circuits are respectively a first switching circuit connected to the first thyristor trigger circuit and a first switching circuit connected to the first thyristor trigger circuit. The second switch circuit connected to the second thyristor trigger circuit; the first switch circuit includes a triode Q1, the base of the triode Q1 is connected to the photoelectric isolation circuit through a resistor R7, and the emitter of the triode Q1 is grounded And its collector is connected to the first thyristor trigger circuit; the second switch circuit includes a triode Q2, the base of the triode Q2 is connected to the photoelectric isolation circuit through a resistor R8, and the emitter of the triode Q2 is grounded and Its collector is connected to the second thyristor trigger circuit. 3. A dual-channel AC power switcher according to claim 1 or 2, characterized in that the control circuit (1) is a chip LPC2214. 4. A dual-way AC power switch according to claim 3, characterized in that: the interlock circuit (4) is composed of a chip 74HC125 and a chip 74HC14; the second pin and the fifth pin of the chip 74HC125 Connect with the 24th pin and the 15th pin of the chip LPC2214 respectively, the 1st pin and the 10th pin of the chip 74HC125 are connected with the 2nd pin of the chip 74HC14, the 4th pin of the chip 74HC125 and the 1st pin The 13 pins are all connected to the 6th pin of the chip 74HC14, the 1st pin and the 3rd pin of the chip 74HC14 are connected to the 82nd pin of the chip LPC2214, the 4th pin and the 5th pin of the chip 74HC14 Feet meet. 5. A dual-way AC power switch according to claim 1 or 2, characterized in that: the first on-off control element is composed of a first thyristor module (3-1) and a second thyristor module (3-2); the first thyristor module (3-1) is composed of one-way thyristor G1 and G2, and the cathode of one-way thyristor G1 is in phase with the anode of one-way thyristor G2 The connection point between the two is connection point L1, the anode of the one-way thyristor G1 is connected to the cathode of the one-way thyristor G2 and the connection point between the two is connection point L2, the first The thyristor module (3-1) is connected in series with the live wire LA of the first AC power supply through the junction point L1 and the junction point L2; the second thyristor module (3-2) is composed of a one-way thyristor Composed of G3 and G4, the cathode of the one-way thyristor G3 is connected to the anode of the one-way thyristor G4, and the junction point between the two is the junction point N1, and the anode of the one-way thyristor G3 is connected to the one-way thyristor G4 The cathodes of the silicon G4 are connected and the connection point between the two is the connection point N2, and the second thyristor module (3-2) is connected in series to the first AC power supply through the connection point N1 and the connection point N2. Neutral line NA; The second on-off control element is composed of a third thyristor module (3-3) and a fourth thyristor module (3-4); the third thyristor module (3-3) is composed of a one-way The thyristor G5 and G6 are composed of the cathode of the one-way thyristor G5 and the anode of the one-way thyristor G6, and the junction point between the two is the junction point L3, and the anode of the one-way thyristor G5 is connected to the one-way thyristor G5. It is connected to the negative electrode of the silicon controlled rectifier G6 and the connection point between the two is the connection point L4, and the third silicon controlled rectifier module (3-3) is connected in series with the second silicon controlled rectifier module (3-3) through the connection point L5 and the connection point L6. In the fire wire LB of AC power supply; the fourth thyristor module (3-4) (3-4) is made up of one-way thyristor G7 and G8, and the cathode of one-way thyristor G7 and one-way thyristor The anodes of G8 are connected and the connection point between them is connection point N3, the anode of one-way thyristor G7 is connected to the cathode of one-way thyristor G8 and the connection point between them is connection point N4, The fourth thyristor module (3-4) is connected in series to the neutral line NB of the second AC power supply through the connection point N3 and the connection point N4. 6. A dual-channel AC power switch according to claim 5, wherein the two switching circuits are respectively a first switching circuit connected to the first thyristor trigger circuit and a first switching circuit connected to the first thyristor trigger circuit. The second switch circuit connected to the second thyristor trigger circuit; the output terminal of the first switch circuit is A_IN, and the output terminal of the second switch circuit is B_IN; The first thyristor trigger circuit includes a first trigger circuit (5-1) connected to the first thyristor module (3-1) and a first trigger circuit (5-1) connected to the second thyristor module (3-2) ) the second trigger circuit (5-2) connected; the first trigger circuit (5-1) includes the first trigger chip connected with the one-way thyristor G1 and connected with the one-way thyristor G2 The second trigger chip, the first trigger chip and the second trigger chip are chips MOC3083; the output terminal is divided into three ways for A_IN, and one way is connected with the first trigger chip of the first trigger chip after passing through the resistor R16. Pins are connected, the other path is connected to the second pin of the second trigger chip after passing through the resistor R18 and the light-emitting diode D22, and the third path is connected to the base of the triode Q3 after passing through the resistor R19; the first The second pin of the trigger chip is connected to the first pin of the second trigger chip, the second pin of the second trigger chip is connected to the collector of the triode Q3, the emitter of the triode Q3 is grounded, and the triode The base of Q3 is connected to the cathode of diode D23, the anode of diode D23 is connected to the cathode of diode D24, and the anode of diode D24 is grounded; a resistor is connected between the 4th pin and the 6th pin of the first trigger chip R17, a resistor R20 is connected between the 4th pin and the 6th pin of the second trigger chip, the 4th pin of the first trigger chip is connected to the 6th pin of the second trigger chip, The 6th pin of the first trigger chip is connected to the control pole of the one-way thyristor G1, and the fourth pin of the second trigger chip is connected to the control pole of the one-way thyristor G2 through the resistor R21. catch; The second trigger circuit (5-2) includes a third trigger chip connected to the one-way thyristor G3 and a fourth trigger chip connected to the one-way thyristor G4, the third trigger chip and the The fourth trigger chip is the chip MOC3083; the output terminal is A_IN divided into three ways, one way is connected to the first pin of the third trigger chip after passing through the resistor R36, and the other way is connected to the first pin of the third trigger chip through the resistor R38 and the light-emitting diode D32 is then connected to the second pin of the fourth trigger chip, and the third circuit is connected to the base of the triode Q4 after passing through the resistor R39; the second pin of the third trigger chip is connected to the fourth pin of the fourth trigger chip The first pin of the fourth trigger chip is connected to the collector of the transistor Q4, the emitter of the transistor Q4 is grounded, the base of the transistor Q4 is connected to the cathode of the diode D33, and the diode D33 The anode of the diode D34 is connected to the cathode of the diode D34, and the anode of the diode D34 is grounded; a resistor R37 is connected between the 4th pin and the 6th pin of the third trigger chip, and the 4th pin and the 6th pin of the fourth trigger chip A resistor R30 is connected between the 6th pins, the 4th pin of the third trigger chip is connected to the 6th pin of the fourth trigger chip, the 6th pin of the third trigger chip is connected to the unidirectional The control pole of the thyristor G3 is connected, and the fourth pin of the fourth trigger chip is connected with the control pole of the one-way thyristor G4 after passing through the resistor R31; The second thyristor trigger circuit includes a third trigger circuit (5-3) connected to the third thyristor module (3-3) and a third trigger circuit (5-3) connected to the fourth thyristor module (3-4) ) the fourth trigger circuit (5-4) connected; the third trigger circuit (5-3) includes the fifth trigger chip connected with the one-way thyristor G5 and the fifth trigger chip connected with the one-way thyristor G6 The sixth trigger chip, the fifth trigger chip and the sixth trigger chip are chips MOC3083; the output terminal is divided into three ways for B_IN, and one way is connected to the first pin of the fifth trigger chip after passing through the resistor R56. Pins are connected, the other path is connected to the second pin of the sixth trigger chip after passing through the resistor R58 and the light-emitting diode D52, and the third path is connected to the base of the triode Q54 after passing through the resistor R59; the fifth The second pin of the trigger chip is connected to the first pin of the sixth trigger chip, the second pin of the sixth trigger chip is connected to the collector of the triode Q54, the emitter of the triode Q54 is grounded, and the triode The base of Q54 is connected to the cathode of diode D53, the anode of diode D53 is connected to the cathode of diode D54, and the anode of diode D54 is grounded; a resistor is connected between the 4th pin and the 6th pin of the fifth trigger chip R57, a resistor R50 is connected between the 4th pin and the 6th pin of the sixth trigger chip, the 4th pin of the fifth trigger chip is connected to the 6th pin of the sixth trigger chip, The 6th pin of the fifth trigger chip is connected to the control pole of the one-way thyristor G5, and the fourth pin of the sixth trigger chip is connected to the control pole of the one-way thyristor G6 through the resistor R51. catch; The fourth trigger circuit (5-4) includes the seventh trigger chip connected with the one-way thyristor G7 and the eighth trigger chip connected with the one-way thyristor G8, the seventh trigger chip and the The eighth trigger chip is chip MOC3083; the output terminal is B_IN divided into three ways, one way is connected to the first pin of the seventh trigger chip after passing through the resistor R66, and the other way is connected to the first pin of the seventh trigger chip through the resistor R68 and the light-emitting diode D62 is then connected to the second pin of the eighth trigger chip, and the third circuit is connected to the base of the triode Q64 after passing through the resistor R69; the second pin of the seventh trigger chip is connected to the eighth trigger chip The first pin of the eighth trigger chip is connected to the collector of the transistor Q64, the emitter of the transistor Q64 is grounded, the base of the transistor Q64 is connected to the cathode of the diode D63, and the diode D63 The anode of the diode D64 is connected to the cathode of the diode D64, and the anode of the diode D64 is grounded; a resistor R67 is connected between the 4th pin and the 6th pin of the seventh trigger chip, and the 4th pin and the 6th pin of the eighth trigger chip are connected to each other. A resistor R60 is connected between the 6th pins, the 4th pin of the seventh trigger chip is connected to the 6th pin of the eighth trigger chip, and the 6th pin of the seventh trigger chip is connected to the unidirectional The control electrode of the thyristor G7 is connected, and the fourth pin of the eighth trigger chip is connected with the control electrode of the one-way thyristor G8 after passing through the resistor R61.