Control circuit and device for double-AC-seat single-phase power supply

Abstract

The invention discloses a double-AC-seat single-phase power supply control circuit, which comprises a first voltage input end, a second voltage input end, an AC voltage output end, a control signal output end and a working voltage input end, and is characterized in that the working voltage input end is used for supplying power to the whole control circuit; the control circuit further comprises a phase comparison module, a voltage detection module, a voltage control unit, a first switch module and a second switch module. According to the design, when phases of the first voltage input end and the second voltage input end are out of phase, or when metal loss is caused by poor contact of any one of the voltage input ends, connection and disconnection between the alternating current voltage end and the external working circuit can be effectively avoided through the second switch module, and the problem that the alternating current voltage end is damaged due to short circuit is avoided. And a safety accident caused by overload of the working load of a single voltage input end is avoided.

Description

Technical Field

[0001] This application relates to the field of power supply technology, and in particular to a control circuit and device for single-phase power supply with dual AC sockets. Background Technology

[0002] In the current power supply industry, high-power power supplies are becoming the application trend, and the existing single-phase single AC input power supply has become a limitation for high-power power supplies. Internationally, the maximum input current that a single-phase single AC input can provide is 16A, and for safety reasons, it is usually used in the range of 10A. Therefore, adopting a design with two AC inputs connected in parallel to achieve higher power supply, reduce AC input losses, and improve product efficiency has become a trend.

[0003] However, direct parallel application of dual AC connectors carries risks: First, when the AC input plugs of dual AC connectors are in use, if the L and N terminals of the AC connectors are out of phase (i.e., the two voltage input terminals are out of phase), it can cause an AC input short circuit, which can easily lead to safety accidents. Second, if one AC connector is not properly connected (i.e., one voltage input terminal has poor contact), it becomes a situation where the other single AC connector is supplying power in real time. In this case, the load on the AC power line increases exponentially, the metal contact loss of the AC connector increases exponentially, the overall energy efficiency of the product decreases, and the AC power line may overheat and be damaged, potentially leading to safety accidents. Therefore, those skilled in the art urgently need to address the aforementioned issues. Summary of the Invention

[0004] To address the technical deficiencies mentioned in the background section, this application provides a control circuit and device for single-phase power supply with dual AC sockets. This effectively prevents the connection between the AC voltage terminal and other operating voltage terminals from being interrupted when the first voltage input terminal and the second voltage input terminal are out of phase, or when poor contact of either terminal causes metal loss. This avoids safety accidents caused by short circuits.

[0005] The present invention adopts the following technical solutions: In a first aspect, this application provides a control circuit with dual AC sockets and single-phase power supply, including a first voltage input terminal, a second voltage input terminal, an AC voltage output terminal, a control signal output terminal, and a working voltage input terminal, wherein the working voltage input terminal is used to power the entire control circuit, and further includes: The phase comparison module is electrically connected to the working voltage terminal, the first voltage input terminal and the second voltage input terminal respectively, and is used to compare the phase of the AC current input to the first voltage input terminal and the second voltage input terminal. When the comparison result is out of phase, the module outputs a voltage control signal. The voltage detection module is electrically connected between the second voltage input terminal and the voltage control unit. When a voltage input is detected, it simultaneously outputs a first conduction signal and a second conduction signal. The voltage control unit is electrically connected to the phase comparison module and the second voltage input terminal, respectively. When it receives a voltage control signal, it directs the voltage flowing to the voltage detection module to ground. A first switching module, electrically connected between the first voltage input terminal and the second voltage input terminal, and electrically connected to the voltage detection module, is used to disconnect the connection between the first voltage input terminal and the second voltage input terminal when no first conduction signal is received; and The second switch module is electrically connected to the voltage detection module, the working voltage input terminal, and the control signal output terminal, respectively. It is used to disconnect the connection between the working voltage input terminal and the control signal output terminal when the second conduction signal is not received. The control signal output terminal is used to control the on / off connection between the AC voltage output terminal and the external working circuit.

[0006] Optionally, the phase comparison module includes: The rectifier bridge is electrically connected to the N1 line of the first voltage input terminal and the N2 line of the second voltage input terminal, respectively; wherein, when the rectifier bridge has no voltage output, the first voltage input terminal and the second voltage input terminal are in phase; when the rectifier bridge has voltage output, the first voltage input terminal and the second voltage input terminal are out of phase. An opto-isolator is provided, wherein the input side of the opto-isolator is electrically connected to the output terminal of the rectifier bridge, and the output side of the opto-isolator is electrically connected to the voltage detection module. The opto-isolator is used to output a voltage control signal based on the voltage output by the rectifier bridge. A first resistor, the first end of which is electrically connected to the rectifier bridge, and the second end of which is electrically connected to the opto-isolator. A first capacitor, one end of which is electrically connected to the rectifier bridge, and the second end of which is grounded.

[0007] Optionally, the voltage control unit includes: The voltage control unit includes: A current-limiting resistor, wherein the first end of the current-limiting resistor is electrically connected to the output side of the opto-isolator, and the second end of the current-limiting resistor is electrically connected to the first switching transistor; The first switching transistor has a control terminal, an input terminal, and an output terminal. The control terminal is electrically connected to the second terminal of the current-limiting resistor, the input terminal is electrically connected to the second voltage input terminal, and the output terminal is grounded.

[0008] Optionally, the voltage detection module includes: The first switching transistor has its gate electrically connected to the output side of the opto-isolator, its source grounded, and its drain electrically connected to the second voltage input terminal. The comparator has its 3rd pin electrically connected between the second voltage input terminal and the control terminal of the first switching transistor; its 2nd and 5th pins are reference voltage pins; its 1st pin is electrically connected to the first switching module; its 4th pin is grounded; and its 6th pin is electrically connected to the second voltage input terminal. Its 1st pin controls the on / off state of the first switching transistor, and its 7th pin controls the on / off state between the operating voltage input terminal and the control signal output terminal. When the first switch is turned on, the voltage supplied to pin 3 of the comparator from the second voltage input terminal is guided to ground by the first switch, so that pin 1 of the comparator does not output the first turn-on signal and the second turn-on signal.

[0009] Optionally, the first switch module includes: The first switch module includes: The first relay has a first terminal electrically connected to the L2 line of the second voltage input terminal, a second terminal connected to the L1 line of the first voltage input terminal, and a fourth terminal electrically connected to the working voltage input terminal. The second relay has its first terminal electrically connected to the N2 line of the second voltage input terminal, and its second terminal connected to the N1 line of the first voltage input terminal. The fifth terminal of the second relay is electrically connected to the working voltage input terminal, and the fourth terminal of the first relay is electrically connected to the fifth terminal of the second relay. When the working voltage input terminal supplies working voltage to the fifth terminal of the second relay, both the first and second relays simultaneously engage, causing the L1 line of the first voltage input terminal and the L2 line of the second voltage input terminal to be connected in parallel, as well as the N1 line of the first voltage input terminal and the N2 line of the second voltage input terminal to be connected in parallel. The first transistor has its collector electrically connected to the working voltage input terminal, its emitter electrically connected to the first relay and the second relay, and its base electrically connected to pin 1 of the comparator. When pin 1 of the comparator outputs a first conduction signal, the first transistor conducts, so that the working voltage supplied by the working voltage input terminal passes through the first transistor to the first relay and the second relay.

[0010] Optionally, the second switch module includes: The second switch module includes: The base of the second transistor is electrically connected to pin 7 of the comparator, the collector of the second transistor is electrically connected to the working voltage input terminal, and the emitter of the second transistor is electrically connected to the control signal output terminal. The third transistor has its base electrically connected to the emitter of the second transistor, its collector electrically connected to the working voltage input terminal, and its emitter electrically connected to the control signal output terminal. The second resistor has its first end electrically connected to pin 7 of the comparator and its second end electrically connected to the base of the second transistor. The third resistor has its first end electrically connected to the emitter of the second transistor and its second end electrically connected to the base of the third transistor. The second capacitor has one end electrically connected to the working voltage input terminal and the other end electrically connected between the second transistor and the third resistor.

[0011] Optionally, the first voltage input terminal is electrically connected to the input terminal of the external auxiliary power supply circuit, and the working voltage input terminal is electrically connected to the output terminal of the external auxiliary power supply circuit. When there is no AC power input at the first voltage input terminal, the external auxiliary power supply circuit has no voltage supply, and the working voltage input terminal has no voltage input.

[0012] Optionally, it also includes a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, and a first diode. The input terminal of the fourth resistor is electrically connected to the second voltage input terminal, the output terminal of the fourth resistor is electrically connected to the fifth resistor, the output terminal of the fifth resistor is electrically connected to the sixth resistor, the output terminal of the sixth resistor is electrically connected to the seventh resistor, the anode of the first diode is electrically connected to one end of the seventh resistor, and the cathode of the first diode is electrically connected to pin 3 of the comparator and the input terminal of the first switching transistor, respectively.

[0013] Optionally, the first voltage input terminal and the AC voltage output terminal are further electrically connected by: The first fuse has its input terminal electrically connected to the L1 line of the first voltage input terminal; The third capacitor has its two ends connected between the L1 line and the N1 line of the first voltage input terminal, respectively. The first common-mode inductor is electrically connected to the two ends of the third capacitor. The second common-mode inductor has its input terminal electrically connected to the output terminal of the first common-mode inductor. The third common-mode inductor has its input terminal electrically connected to the output terminal of the second common-mode inductor.

[0014] Secondly, this application provides a control device for single-phase power supply with dual AC sockets, including the control circuit for single-phase power supply with dual AC sockets as described above; The control circuit for the single-phase power supply of the dual AC connectors is etched onto the circuit board.

[0015] In summary, the beneficial effects of the present invention are as follows: 1. By setting a phase comparison module, the phase of the voltages at the first and second voltage input terminals can be detected. When the phases are in phase, it indicates that both the first and second voltage input terminals have voltage inputs and their AC currents are in phase. At this time, the phase comparison module will output a voltage control signal to the voltage control unit. Since the voltage control signal is a low-level signal, the voltage control unit will not conduct, and therefore will not guide the voltage flowing to the voltage detection module to ground. The voltage detection module will receive the voltage supplied by the second voltage input terminal and output a first conduction signal and a second conduction signal. By setting a first switch module and a second switch module to receive the first conduction signal and the second conduction signal in sequence, the entire circuit will work normally.

[0016] 2. When both the first and second voltage input terminals have voltage input, and the phase comparison module finds that the phases of the voltages at the first and second voltage input terminals are out of phase, the phase comparison module will output a voltage control signal to the switch control unit. At this time, the voltage control signal is a high-level control signal, so the switch control unit will be turned on due to the high-level signal, and the voltage flowing to the voltage detection module will be guided to ground. At this time, the voltage detection module will not detect any voltage input, so the voltage detection module will not output the first and second turn-on signals. Therefore, the AC voltage output port will be disconnected from other external working circuits, and the entire circuit will not work, thus avoiding short circuits caused by the phase difference of the two AC currents and improving the safety of the circuit. 3. When either the first voltage input terminal or the second voltage input terminal has poor contact, the voltage detection module will not detect the voltage supplied by the second voltage input terminal. Therefore, the voltage detection module will not output the second conduction signal, and the AC voltage output port will be disconnected from other external working circuits through the second switch module. When the first voltage input terminal has poor contact, since power cannot be supplied to the external auxiliary power circuit, there is no voltage supply to the working voltage input terminal. Therefore, the voltage detection module cannot receive the working voltage and cannot work, thus it cannot output the first and second conduction signals. Therefore, the AC voltage output terminal still cannot conduct with other external circuits, and the first switch module is also disconnected due to the lack of the first conduction signal. Therefore, the entire control circuit does not work. Therefore, by using the above method, it is possible to effectively avoid the situation where one voltage input terminal has poor contact and the other voltage input terminal is supplied with power in real time, which would increase the load on the power line and prevent safety accidents. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the architecture of an embodiment of the present invention; Figure 2 This is a circuit schematic diagram of an embodiment of the present invention. Attached image description: 100. First voltage input terminal; 200. Second voltage input terminal; Vac, AC voltage output terminal; VCC1, control signal output terminal; STBY_VCC, operating voltage input terminal; 300, Phase Comparison Module; BD1, Rectifier Bridge; U2, Opto-isolation Device; R1, First Resistor; EC1, First Capacitor; 400, Voltage detection module; U1, Comparator; 500, First switch module; RL1, First relay; RL2, Second relay; Q1, First transistor; 600, Second switch module; Q5, Second transistor; Q2, Third transistor; R9, Second resistor; R16, Third resistor; C2, Second capacitor; R18, Fourth resistor; R19, Fifth resistor; R20, Sixth resistor; R21, Seventh resistor; D2, First diode; F1, First fuse; F2, Second fuse; DA1, Second diode; CX1, third capacitor; CX3, fourth capacitor; CX2, fifth capacitor; LF1, first common-mode inductor; LF2, second common-mode inductor; LF3, third common-mode inductor; 610, overheat protection unit; NTC1, thermistor; Q3, second switching transistor; 700, Voltage control unit; R4, Current limiting resistor; Q4, First switching transistor. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0021] like Figure 1As shown, this application provides a control circuit for single-phase power supply of an AC socket, including a first voltage input terminal 100, a second voltage input terminal 200, an AC voltage output terminal Vac, a control signal output terminal VCC1, and a working voltage input terminal STBY_VCC electrically connected to an external auxiliary power supply circuit. The first voltage input terminal 100 is electrically connected to the external auxiliary power supply circuit, and the working voltage input terminal STBY_VCC is connected to the external auxiliary power supply circuit and provides working voltage for the entire control circuit. It also includes a phase comparison module 300, a voltage detection module 400, a voltage control unit 700, a first switch module 500, and a second switch module 600. The phase comparison module 300 is electrically connected to the working voltage terminal, the first voltage input terminal 100, and the second voltage input terminal 200, respectively, and is used to compare the phase of the AC power input to the first voltage input terminal 100 and the second voltage input terminal 200. When the comparison result is out of phase, it outputs a voltage control signal. The voltage detection module 400 is electrically connected to the second voltage input terminal 200 and the voltage control unit 700. When a voltage input is detected, a first conduction signal and a second conduction signal are simultaneously output. The voltage control unit 700 is electrically connected to the phase comparison module 300 and the second voltage input terminal 200, respectively. When a voltage control signal is received, the voltage flowing to the voltage detection module 400 is directed to ground. The first switch module 500 is electrically connected between the first voltage input terminal 100 and the second voltage input terminal 200, and is also electrically connected to the voltage detection module 400. It is used to disconnect the connection between the first voltage input terminal 100 and the second voltage input terminal 200 when the first conduction signal is not received. The second switch module 600 is electrically connected to the voltage detection module 400, the working voltage input terminal STBY_VCC, and the control signal output terminal VCC1, respectively. It is used to disconnect the connection between the working voltage input terminal STBY_VCC and the control signal output terminal VCC1 when the second conduction signal is not received. The control signal output terminal VCC1 is used to control the on / off state between the AC voltage output terminal Vac and the external working circuit.

[0022] In this embodiment, both the first voltage input terminal 100 and the second voltage input terminal 200 are composed of L-line and N-line. Specifically, the first voltage input terminal 100 consists of L1-line and N1-line, and the second voltage input terminal 200 consists of L2-line and N2-line. The first voltage input terminal 100 provides operating voltage to the external auxiliary power supply circuit, while the operating voltage input terminal STBY_VCC is electrically connected to the external auxiliary power supply circuit, thereby providing operating voltage to the control circuit of this embodiment. The AC voltage output terminal Vac is connected to the external downstream circuit, which can be the load terminal of the external operating circuit.

[0023] When the first voltage input terminal 100 has poor contact, i.e., when AC voltage cannot be input through the first voltage input terminal 100, the external auxiliary power circuit has no power supply, and therefore cannot provide working voltage to the working voltage input terminal STBY_VCC. As a result, the voltage detection module 400 will not output the first conduction signal and the second conduction signal. Since the second switch module 600 requires the second conduction signal to conduct, the working voltage input terminal STBY_VCC and the control signal output terminal VCC1 cannot conduct. The control signal output terminal VCC1 has no voltage output. When the control signal output terminal VCC1 does not output a control signal, the AC voltage output terminal Vac will not conduct with the external working circuit. Therefore, the entire control circuit is in a closed state.

[0024] When there is voltage input at the first voltage input terminal 100, and there is poor contact at the second voltage input terminal 200 (i.e., no voltage input at the second voltage input terminal 200), the voltage detection module 400 cannot detect any voltage input. Therefore, the voltage detection module 400 will not output the first conduction signal and the second conduction signal. Consequently, the second switch module 600 cannot connect the working voltage input terminal STBY_VCC and the control signal output terminal VCC1, thus shutting off the voltage output at the AC voltage output terminal Vac. Since the first voltage input terminal 100 and the AC voltage output terminal Vac are also not connected, the entire circuit stops working. This prevents the circuit from burning out due to excessive load current and voltage caused by poor contact at either the first voltage input terminal 100 or the second voltage input terminal 200, thus avoiding safety accidents. Furthermore, it reduces metal contact losses and improves the overall energy efficiency of the product.

[0025] Furthermore, when both the first voltage input terminal 100 and the second voltage input terminal 200 have voltage input, the phase comparison module 300 is set to detect whether there is a phase difference between the first voltage input terminal 100 and the second voltage input terminal 200. If there is a phase difference, the phase comparison module 300 will send a high-level signal to the voltage control unit 700, and the voltage control unit 700 will be turned on. The voltage range of the turned-on voltage is AC 90-265V. If it is lower than this value, it will not be turned on. If it is turned on, the voltage flowing to the voltage detection module 400 will be guided to ground. Specifically, when the control terminal of the first switching transistor Q4 receives a high-level signal, it will conduct, causing the voltage originally supplied to comparator U1 from the second voltage input terminal 200 to be supplied to ground through the first switching transistor Q4. Consequently, comparator U1 has no voltage input and therefore will not output the first conduction signal. When the first switching module 500 has no input of the first conduction signal, it will disconnect the parallel connection between the first voltage input terminal 100 and the second voltage input terminal 200. Simultaneously, the voltage detection module 400 of comparator U1 will not output the second conduction signal to the control signal output terminal VCC1. It should be noted that there is also a control unit between the AC signal output terminal and the external working circuit. The conduction condition of this control unit is achieved through the control signal output from the control signal output terminal VCC1. Therefore, the external working circuit cannot obtain the operating voltage, causing the entire control circuit to cease operation. This effectively prevents a short circuit caused by the first voltage input terminal 100 and the second voltage input terminal 200 being out of phase, thus avoiding a dangerous situation.

[0026] When both the first voltage input terminal 100 and the second voltage input terminal 200 have voltage inputs, and when the phase comparison module 300 compares the phases of the first voltage input terminal 100 and the second voltage input terminal 200, if the phases are in phase, the phase comparison module 300 will output a low-level signal. This low-level signal cannot turn on the first switch Q4. Therefore, the voltage supplied by the second voltage input terminal 200 cannot flow to ground through the first switch Q4, but instead flows to comparator U1. When comparator U1 has a voltage input, comparator U1 will simultaneously output... The circuit outputs a first conduction signal and a second conduction signal. The first conduction signal turns on the first switch module 500, thereby connecting the first voltage input terminal 100 and the second voltage input terminal 200 in parallel. The second conduction signal turns on the second switch module 600. By turning on the second switch module 600 through the second conduction signal, the voltage supplied by the control signal output terminal VCC1 through the working voltage input terminal STBY_VCC is used to output a control signal. This enables the AC voltage output terminal Vac to conduct with the external working circuit, forming an AC loop, and the entire circuit enters the normal working state.

[0027] Optional, such as Figure 2As shown, the phase comparison module 300 includes a rectifier bridge BD1 and an opto-isolator U2. The rectifier bridge BD1 is electrically connected to the N1 line of the first voltage input terminal 100 and the N2 line of the second voltage input terminal 200. When the rectifier bridge BD1 has no voltage output, the first voltage input terminal 100 and the second voltage input terminal 200 are in phase. When the rectifier bridge BD1 has a voltage output, the first voltage input terminal 100 and the second voltage input terminal 200 are out of phase. The input side of the opto-isolator U2 is electrically connected to the output terminal of the rectifier bridge BD1, and the output side of the opto-isolator U2 is electrically connected to the voltage detection module 400. The opto-isolator U2 is used to output a voltage signal according to the voltage output by the rectifier bridge BD1. In this embodiment, the rectifier bridge BD1 has an input terminal and an output terminal. The input terminal is electrically connected to the N1 line of the first voltage input terminal 100 and the N2 line of the second voltage input terminal 200. The output terminal is electrically connected to the input side of the opto-isolator U2. When the voltages supplied by the first voltage input terminal 100 and the second voltage input terminal 200 are in phase, since the voltage between the N1 and N2 lines is 0, N1 and N2 are completely in phase. According to the formula, VN1(t) = VN2(t), where VN1 represents the voltage of the first voltage input terminal 100. VN2 represents the voltage at the first voltage input terminal 100, and t represents time. Therefore, the rectifier bridge BD1 has no voltage supplied to the input side of the opto-isolator U2. When there is no voltage at the input side of the opto-isolator U2, there is no voltage signal output at the output side of the opto-isolator U2. At this time, the first switch Q4 in the voltage detection module 400 will not be turned on. However, when the first switch Q4 is not turned on, the voltage supplied by the second voltage input terminal 200 will be supplied to the comparator U1. Therefore, the comparator U1 can output the first turn-on signal and the second turn-on signal.

[0028] When the voltages supplied by the first voltage input terminal 100 and the second voltage input terminal 200 are out of phase, a voltage difference will be generated because the waveforms of the N1 line and the N2 line are inconsistent. This will result in a voltage input on the input side of the opto-isolator U2, and a voltage output on the output side of the opto-isolator U2, which will turn on the first switch Q4. As a result, the working voltage output by the second voltage output terminal will be output to the ground line through the first switch Q4. Since the comparator U1 cannot receive the working voltage, it will not output the first turn-on signal and the second turn-on signal.

[0029] Furthermore, the phase comparison module 300 also includes a first resistor R1 and a second resistor R9. The first end of the first resistor R1 is electrically connected to the rectifier bridge BD1, and the second end of the first resistor R1 is electrically connected to the opto-isolator U2. One end of the first capacitor EC1 is electrically connected to the rectifier bridge BD1, and the second end of the first capacitor EC1 is grounded.

[0030] In this embodiment, the phase comparison module 300 may further include a first resistor R1 and a second capacitor C2. The first resistor R1 can prevent the current output by the rectifier bridge BD1 from being too large and burning out the opto-isolation device U2, and the second capacitor C2 can filter the current output by the rectifier bridge BD1.

[0031] Optional, such as Figure 2 As shown, the voltage control unit 700 includes a current-limiting resistor R4 and a first switching transistor Q4. The first end of the current-limiting resistor R4 is electrically connected to the output side of the opto-isolator U2, and the second end of the current-limiting resistor R4 is electrically connected to the first switching transistor Q4. The first switching transistor Q4 has a control terminal, an input terminal, and an output terminal. The control terminal is electrically connected to the second end of the current-limiting resistor R4, the input terminal is electrically connected to the second voltage input terminal 200, and the output terminal is grounded.

[0032] In this embodiment, by setting a current-limiting resistor R4, the current supplied to the opto-isolator U2 can be limited to prevent excessive current from burning out the first switching transistor Q4. Specifically, the first switching transistor Q4 can be a MOSFET, with the control terminal being the gate, the input terminal being the drain, and the output terminal being the source. By setting the first switching transistor Q4, it can receive the high-level signal supplied by the opto-isolator U2 and thus turn it on, guiding the voltage flowing to the comparator U1 to ground, thereby preventing the comparator U1 from having any voltage input and thus preventing the comparator U1 from outputting the first and second conduction signals.

[0033] Optional, such as Figure 2 As shown, the voltage detection module 400 includes a comparator U1. Pin 3 of the comparator U1 is electrically connected between the second voltage input terminal 200 and the control terminal of the first switching transistor Q4. Pins 2 and 5 of the comparator U1 are reference voltage pins. Pin 1 of the comparator U1 is electrically connected to the first switching module 500. Pin 4 of the comparator U1 is grounded. Pin 6 of the comparator U1 is electrically connected to the second voltage input terminal 200. Pin 1 of the comparator U1 is used to control the on / off state of the first switching transistor Q4. Pin 7 of the comparator U1 is used to control the on / off state between the working voltage input terminal STBY_VCC and the control signal output terminal VCC1. When the first switch Q4 is turned on, the voltage supplied from the second voltage input terminal 200 to pin 3 of the comparator U1 is guided to ground by the first switch Q4, so that pin 1 of the comparator U1 does not output the first turn-on signal and the second turn-on signal.

[0034] In this embodiment, the voltage detection module 400 may include a comparator U1, which may be a dual comparator U1. The control terminal of the first switch Q4 is electrically connected to the output side of the opto-isolator U2, and the output terminal is grounded. The input terminal is electrically connected to the second voltage input terminal 200. By setting the first switch Q4, the voltage delivered by the second voltage input terminal 200 can be guided. When the first switch Q4 is turned on, that is, when the opto-isolator U2 outputs voltage (when the first voltage input terminal 100 and the second voltage input terminal 200 are out of phase), the voltage output by the second voltage input terminal 200 will be grounded through the first switch Q4. The 3rd and 6th pins of the comparator U1 will not receive any voltage. Since the 2nd and 5th pins of the comparator U1 are reference voltage pins, when the 3rd pin is compared with the 2nd pin, and the 6th pin is compared with the 5th pin, the 3rd and 6th pins are not within the input voltage range of the 2nd and 5th pins. Therefore, pin 1 of comparator U1 will not output the first conduction signal, and pin 7 of comparator U1 will not output the second conduction signal, which will cause the first switch module 500 to not receive the first conduction signal, and the second switch module 600 will not receive the second conduction signal.

[0035] Optional, such as Figure 2 As shown, the first switch module 500 includes a first relay RL1 and a second relay RL2. The first terminal of the first relay RL1 is electrically connected to the L2 line of the second voltage input terminal 200, the second terminal of the first relay RL1 is connected to the L1 line of the first voltage input terminal 100, and the fourth terminal of the first relay RL1 is electrically connected to the working voltage input terminal STBY_VCC. The first terminal of the second relay RL2 is electrically connected to the N2 line of the second voltage input terminal 200, and the second terminal of the second relay RL2 is connected to the N1 line of the first voltage input terminal 100. The fifth terminal of the second relay RL2 is electrically connected to the working voltage input terminal STBY_VCC, and the fourth terminal of the first relay RL1 is electrically connected to the fifth terminal of the second relay RL2. When the working voltage input terminal STBY_VCC supplies working voltage to the fifth terminal of the second relay RL2, the first relay RL1 and the second relay RL2 are respectively energized, so that the first voltage input terminal 100L1 line and the second voltage input terminal 200L2 line are connected in parallel, and the N1 line of the first voltage input terminal 100 and the N2 line of the second voltage input terminal 200 are connected in parallel.

[0036] In this embodiment, the first terminal (pin 1) of the first relay RL1 is connected to the L2 line of the second voltage input terminal 200, the second terminal is electrically connected to the input terminal of the second fuse F2, the fourth terminal (pin 4) is electrically connected to the emitter of the first transistor Q1, and the fifth terminal (pin 5) is grounded; the first terminal (pin 1) of the second relay RL2 is electrically connected to the N2 line of the second voltage input terminal 200, the second terminal (pin 2) is electrically connected to the N1 line of the first voltage input terminal 100, the fourth terminal (pin 4) is grounded, and the fifth terminal (pin 5) is electrically connected to the emitter of the first transistor Q1. When the first transistor Q1... Upon receiving the first conduction signal, the operating voltage input terminal STBY_VCC will supply the operating voltage to the fourth terminal (pin 4) of the first relay RL1 and the fifth terminal (pin 5) of the second relay RL2 through the first transistor Q1. This allows the first relay RL1 to electrically connect the L2 line of the second voltage input terminal 200 and the L1 line of the first voltage input terminal 100, and the second relay RL2 to electrically connect the N2 line of the second voltage input terminal 200 and the N2 line of the first voltage input terminal 100, thereby enabling the first voltage input terminal 100 and the second voltage input terminal 200 to be connected in parallel.

[0037] The first switching module 500 further includes a first transistor Q1. The collector of the first transistor Q1 is electrically connected to the working voltage input terminal STBY_VCC. The emitter of the first transistor is electrically connected to the first relay RL1 and the second relay RL2, respectively. The base of the first transistor Q1 is electrically connected to pin 1 of the comparator U1. When pin 1 of the comparator U1 outputs a first conduction signal, the first transistor Q1 is turned on, so that the working voltage supplied by the working voltage input terminal STBY_VCC is transmitted to the first relay RL1 and the second relay RL2 through the first transistor Q1.

[0038] In this embodiment, by setting a first transistor Q1, it can receive a first conduction signal, making the first transistor a switch for the first relay RL1 and the second relay RL2 to engage, thus improving the flexibility of this application.

[0039] Optional, such as Figure 2As shown, it also includes a second switching module 600, which includes a second transistor Q5, a third transistor Q2, a second resistor R9, a third resistor R16, and a second capacitor C2. The base of the second transistor Q5 is electrically connected to pin 7 of the comparator U1, the collector of the second transistor Q5 is electrically connected to the operating voltage input terminal STBY_VCC, and the emitter of the second transistor Q5 is electrically connected to the control signal output terminal VCC1. The base of the third transistor Q2 is electrically connected to the emitter of the second transistor Q5, and the collector of the third transistor Q2 is electrically connected to the operating voltage input terminal STBY_VCC1. The emitter of the third transistor Q2 is electrically connected to the control signal output terminal VCC1; the first end of the second resistor R9 is electrically connected to pin 7 of the comparator U1, and the second end of the second resistor R9 is electrically connected to the base of the second transistor Q5; the first end of the third resistor R16 is electrically connected to the emitter of the second transistor Q5, and the second end of the third resistor R16 is electrically connected to the base of the third transistor Q2; one end of the second capacitor C2 is electrically connected to the working voltage input terminal STBY_VCC, and the other end is electrically connected between the second transistor Q5 and the third resistor R16.

[0040] In this embodiment, when the second transistor Q5 is turned on, it pulls the voltage originally supplied to the base of the third transistor Q2 from the working voltage input terminal STBY_VCC to ground. Therefore, the third transistor Q2 is not turned on. When the third transistor Q2 is not turned on, the voltage originally supplied from the working voltage input terminal STBY_VCC cannot be supplied to the control signal output terminal VCC1 through the third transistor Q2, thus preventing control of the conduction between the AC voltage output terminal Vac and the external working circuit. The second resistor R9 prevents excessive current output from pin 7 of comparator U1 from damaging the second transistor Q5. The third resistor R16 prevents excessive current from the working voltage supply from damaging the third transistor Q2. The second capacitor C2 filters the voltage supplied from the working voltage input terminal STBY_VCC.

[0041] In one example, such as Figure 2As shown, the second switching module 600 also includes an overheat protection unit 610, which may include a thermistor NTC1 and a second switching transistor Q3. The second switching transistor Q3 may also be a MOSFET. The first terminal of the thermistor NTC1 is electrically connected to the output side of the opto-isolator U2, and the second terminal is electrically connected to the gate of the second switching transistor Q3. The drain of the second switching transistor Q3 is electrically connected to pin 7 of the comparator U1, and the source of the second switching transistor Q3 is grounded. When the thermistor NTC1 is affected by a heat source, i.e., when the circuit overheats, its resistance changes, creating a voltage difference. This causes the gate of the second switch Q3 to reach its threshold voltage, turning on Q3. This pulls the current to pin 7 of comparator U1 to ground, resulting in no current input to the base of the second transistor Q5 (i.e., no second conduction signal input). Consequently, Q5 does not conduct, and its collector has no current output. Therefore, the third transistor Q2 does not conduct. At this time, the operating voltage input terminal STBY_VCC is disconnected from the control signal output terminal VCC1, resulting in no control signal output from VCC1. This disconnects the AC voltage output terminal Vac from the external operating circuit. This method ensures that the AC output of the AC voltage output terminal Vac is promptly cut off when the circuit overheats, further protecting the control circuit and improving safety performance.

[0042] Optional, such as Figure 2 As shown, the control circuit in this embodiment may further include a fourth resistor R18, a fifth resistor R19, a sixth resistor R20, a seventh resistor R21, a first diode D2D2, and a second diode DA1DA1. The input terminal of the fourth resistor R18 is electrically connected to the second voltage input terminal 200, the output terminal of the fourth resistor R18 is electrically connected to the fifth resistor R19, the output terminal of the fifth resistor R19 is electrically connected to the sixth resistor R20, the output terminal of the sixth resistor R20 is electrically connected to the seventh resistor R21, the anode of the first diode D2 is electrically connected to one end of the seventh resistor R21, the cathode of the first diode D2 is electrically connected to the drain of the first switching transistor Q4, the cathode of the second diode DA1 is electrically connected to the base of the second transistor Q5, and the anode is electrically connected to the fifth terminal of the second relay RL2.

[0043] In this embodiment, the fourth resistor R18, the fifth resistor R19, the sixth resistor R20, and the seventh resistor R21 are connected in series. By setting these four resistors, the voltage supplied to the second voltage input terminal 200 can be current-limited, preventing excessive current from damaging the first switching transistor Q4 and the comparator U1. By setting the first diode D2, reverse current can be prevented. By setting the second diode DA1, the second relay RL2 can be associated with the control signal output terminal VCC1. Thus, the low impedance characteristic of the second relay RL2 when it is not working pulls down the base voltage of the second transistor Q5, making the second transistor Q5 conduct. This grounds the voltage at the working voltage input terminal STBY_VCC, and there is no control signal output at this time. Through the above method, when the second relay RL2 is turned off, the AC voltage output terminal Vac is disconnected from the external working circuit, improving safety performance.

[0044] Optional, such as Figure 2 As shown, a first fuse F1, a third capacitor CX1, a first common-mode inductor LF1, a second common-mode inductor LF2, and a third common-mode inductor LF3 are electrically connected between the first voltage input terminal 100 and the AC voltage output terminal Vac. The input terminal of the first fuse F1 is electrically connected to the L1 line of the first voltage input terminal 100. The two ends of the third capacitor CX1 are respectively connected between the L1 line and the N1 line of the first voltage input terminal 100. The input terminal of the first common-mode inductor LF1 is electrically connected to the two ends of the third capacitor CX1. The input terminal of the second common-mode inductor LF2 is electrically connected to the output terminal of the first common-mode inductor LF1. The input terminal of the third common-mode inductor LF3 is electrically connected to the output terminal of the second common-mode inductor LF2.

[0045] In this embodiment, by setting a first fuse F1, it is possible to prevent the current and voltage supplied by the first voltage input terminal 100 from being too large and burning out other components. By setting a third capacitor CX1, a first common-mode inductor LF1, a second common-mode inductor LF2, and a third common-mode inductor LF3, it is possible to filter the AC power supplied by the first voltage input terminal 100 and / or the second voltage input terminal 200, thereby improving the embodiment of this application.

[0046] In this embodiment, the two input terminals of the second common-mode inductor LF2 are also connected to a fourth capacitor CX3, and the two input terminals of the third common-mode inductor LF3 are also connected in parallel to a fifth capacitor CX2. By connecting the third capacitor CX1, the fourth capacitor CX3, and the fifth capacitor CX2 to the input terminals of the first common-mode inductor LF1, the second common-mode inductor LF2, and the third common-mode inductor LF3 respectively, the AC current input to each common-mode inductor can be filtered.

[0047] The second aspect of this application discloses a control device for a single-phase power supply with dual AC sockets, comprising a control circuit and a circuit board as described above. The control circuit for the single-phase power supply with dual AC sockets is etched onto the circuit board (not shown in the figure). By setting up a control device for a single-phase power supply with dual AC sockets, it is possible to prevent short circuits caused by phase mismatch between the first voltage input terminal and the second voltage input terminal when voltage is input simultaneously. Furthermore, it is possible to prevent overheating and damage to the AC power cord caused by poor contact at either the first voltage input terminal or the second voltage input terminal when there is only one AC load, thus avoiding safety accidents.

[0048] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this application, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, they are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the accompanying drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0049] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A control circuit with dual AC sockets and single-phase power supply, characterized in that, It includes a first voltage input terminal, a second voltage input terminal, an AC voltage output terminal, a control signal output terminal, and a working voltage input terminal, wherein the working voltage input terminal is used to power the entire control circuit, and also includes: The phase comparison module is electrically connected to the working voltage terminal, the first voltage input terminal and the second voltage input terminal respectively, and is used to compare the phase of the AC current input to the first voltage input terminal and the second voltage input terminal. When the comparison result is out of phase, the module outputs a voltage control signal. The voltage detection module is electrically connected between the second voltage input terminal and the voltage control unit. When a voltage input is detected, it simultaneously outputs a first conduction signal and a second conduction signal. The voltage control unit is electrically connected to the phase comparison module and the second voltage input terminal, respectively. When it receives a voltage control signal, it directs the voltage flowing to the voltage detection module to ground. The first switch module is electrically connected between the first voltage input terminal and the second voltage input terminal, and electrically connected to the voltage detection module, and is used to disconnect the connection between the first voltage input terminal and the second voltage input terminal when no first conduction signal is received; The second switch module is electrically connected to the voltage detection module, the working voltage input terminal, and the control signal output terminal, respectively. It is used to disconnect the connection between the working voltage input terminal and the control signal output terminal when the second conduction signal is not received. The control signal output terminal is used to control the on / off connection between the AC voltage output terminal and the external working circuit.

2. The control circuit for single-phase power supply with dual AC sockets as described in claim 1, characterized in that, The phase comparison module includes: The rectifier bridge is electrically connected to the N1 line of the first voltage input terminal and the N2 line of the second voltage input terminal, respectively; wherein, when the rectifier bridge has no voltage output, the first voltage input terminal and the second voltage input terminal are in phase; when the rectifier bridge has voltage output, the first voltage input terminal and the second voltage input terminal are out of phase. An opto-isolator is provided, wherein the input side of the opto-isolator is electrically connected to the output terminal of the rectifier bridge, and the output side of the opto-isolator is electrically connected to the voltage detection module. The opto-isolator is used to output a voltage control signal based on the voltage output by the rectifier bridge. A first resistor, the first end of which is electrically connected to the rectifier bridge, and the second end of which is electrically connected to the opto-isolator. A first capacitor, one end of which is electrically connected to the rectifier bridge, and the second end of which is grounded.

3. The control circuit for single-phase power supply with dual AC sockets as described in claim 2, characterized in that, The voltage control unit includes: A current-limiting resistor, wherein the first end of the current-limiting resistor is electrically connected to the output side of the opto-isolator, and the second end of the current-limiting resistor is electrically connected to the first switching transistor; The first switching transistor has a control terminal, an input terminal, and an output terminal. The control terminal is electrically connected to the second terminal of the current-limiting resistor, the input terminal is electrically connected to the second voltage input terminal, and the output terminal is grounded.

4. The control circuit for single-phase power supply with dual AC sockets as described in claim 3, characterized in that, The voltage detection module includes: The comparator has its 3rd pin electrically connected between the second voltage input terminal and the control terminal of the first switching transistor; its 2nd and 5th pins are reference voltage pins; its 1st pin is electrically connected to the first switching module; its 4th pin is grounded; and its 6th pin is electrically connected to the second voltage input terminal. Its 1st pin controls the on / off state of the first switching transistor, and its 7th pin controls the on / off state between the operating voltage input terminal and the control signal output terminal. When the first switch is turned on, the voltage supplied to pin 3 of the comparator from the second voltage input terminal is guided to ground by the first switch, so that pin 1 of the comparator does not output the first turn-on signal and the second turn-on signal.

5. The control circuit for single-phase power supply with dual AC sockets as described in any one of claims 1-4, characterized in that, The first switch module includes: The first relay has a first terminal electrically connected to the L2 line of the second voltage input terminal, a second terminal connected to the L1 line of the first voltage input terminal, and a fourth terminal electrically connected to the working voltage input terminal. The second relay has its first terminal electrically connected to the N2 line of the second voltage input terminal, and its second terminal connected to the N1 line of the first voltage input terminal. The fifth terminal of the second relay is electrically connected to the working voltage input terminal, and the fourth terminal of the first relay is electrically connected to the fifth terminal of the second relay. When the working voltage input terminal supplies working voltage to the fifth terminal of the second relay, both the first and second relays simultaneously engage, causing the L1 line of the first voltage input terminal and the L2 line of the second voltage input terminal to be connected in parallel, as well as the N1 line of the first voltage input terminal and the N2 line of the second voltage input terminal to be connected in parallel. The first transistor has its collector electrically connected to the working voltage input terminal, its emitter electrically connected to the first relay and the second relay, and its base electrically connected to pin 1 of the comparator. When pin 1 of the comparator outputs a first conduction signal, the first transistor conducts, so that the working voltage supplied by the working voltage input terminal passes through the first transistor to the first relay and the second relay.

6. The control circuit for single-phase power supply with dual AC sockets as described in claim 4, characterized in that, The second switch module includes: The base of the second transistor is electrically connected to pin 7 of the comparator, the collector of the second transistor is electrically connected to the working voltage input terminal, and the emitter of the second transistor is electrically connected to the control signal output terminal. The third transistor has its base electrically connected to the emitter of the second transistor, its collector electrically connected to the working voltage input terminal, and its emitter electrically connected to the control signal output terminal. The second resistor has its first end electrically connected to pin 7 of the comparator and its second end electrically connected to the base of the second transistor. The third resistor has its first end electrically connected to the emitter of the second transistor and its second end electrically connected to the base of the third transistor. The second capacitor has one end electrically connected to the working voltage input terminal and the other end electrically connected between the second transistor and the third resistor.

7. The control circuit for single-phase power supply with dual AC sockets as described in any one of claims 1-4, characterized in that, The first voltage input terminal is electrically connected to the input terminal of the external auxiliary power supply circuit, and the working voltage input terminal is electrically connected to the output terminal of the external auxiliary power supply circuit. When there is no AC power input at the first voltage input terminal, the external auxiliary power supply circuit has no voltage supply, and the working voltage input terminal has no voltage input.

8. The control circuit for single-phase power supply with dual AC sockets as described in any one of claims 4, characterized in that, It also includes a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, and a first diode. The input terminal of the fourth resistor is electrically connected to the second voltage input terminal. The output terminal of the fourth resistor is electrically connected to the fifth resistor. The output terminal of the fifth resistor is electrically connected to the sixth resistor. The output terminal of the sixth resistor is electrically connected to the seventh resistor. The anode of the first diode is electrically connected to one end of the seventh resistor. The cathode of the first diode is electrically connected to pin 3 of the comparator and the input terminal of the first switching transistor, respectively.

9. The control circuit for single-phase power supply with dual AC sockets as described in claim 1, characterized in that, The first voltage input terminal and the AC voltage output terminal are also electrically connected by: The first fuse has its input terminal electrically connected to the L1 line of the first voltage input terminal; The third capacitor has its two ends connected between the L1 line and the N1 line of the first voltage input terminal, respectively. The first common-mode inductor is electrically connected to the two ends of the third capacitor. The second common-mode inductor has its input terminal electrically connected to the output terminal of the first common-mode inductor. The third common-mode inductor has its input terminal electrically connected to the output terminal of the second common-mode inductor.

10. A control device for single-phase power supply with dual AC sockets, characterized in that, Includes the control circuit for single-phase power supply with dual AC sockets as described in any one of claims 1-9; The control circuit for the single-phase power supply of the dual AC connectors is etched onto the circuit board.

Images