Power supply control circuit

Abstract

The utility model provides a power supply control circuit. The power supply control circuit comprises a power supply connecting end, a switch module, an isolating circuit and a driving control circuit, the power supply connecting end is used for connecting a power supply, and the power supply is alternating current; the switch module is electrically connected with the power supply connecting end; the isolating circuit is electrically connected with the power supply connecting end; the isolating circuit isolates and converts the alternating current into direct current; and the driving control circuit is electrically connected with the isolating circuit and the switch module, and the driving control circuit generates a driving signal when receiving the direct current, adjusts an output driving voltage and controls the on-off of the switch module so as to control the on-off of the power supply. According to the power supply control circuit, the output driving voltage is adjusted through the isolated direct current to control the on-off of the switch module, so that the on-off of the alternating current is controlled, the isolation and safety are high, the response speed is high, the precision is high, the size is small, the service life is long, and stability and reliability are achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power supply control, in particular to a power supply control circuit. BACKGROUND

[0002] The popularity and widespread application of alternating current have greatly promoted the development of modern society. Alternating current is not only a form of electric current, but also the core of modern power systems, supporting global power supply and infrastructure construction. Through the progress of semiconductor technology and control systems, the control and management of alternating current have become more efficient and intelligent, covering a wide range of needs from household electricity to industry, transportation and other fields. Traditional alternating current usually uses mechanical switch control, which has slow response speed, large size, limited life and low reliability. CONTENT OF THE INVENTION

[0003] The present application provides an improved power supply control circuit.

[0004] The present application provides a power supply control circuit, comprising:

[0005] A power connection end for connecting a power supply, wherein the power supply is alternating current;

[0006] A switch module electrically connected to the power connection end;

[0007] An isolation circuit electrically connected to the power connection end; the isolation circuit converts the alternating current into direct current;

[0008] A drive control circuit electrically connected to the isolation circuit and the switch module, the drive control circuit generates a drive signal when receiving the direct current and adjusts the output drive voltage to control the on-off of the switch module, thereby controlling the on-off of the power supply.

[0009] Preferably, the drive control circuit comprises:

[0010] A signal generation circuit electrically connected to the isolation circuit; the signal generation circuit generates a drive signal and a control signal;

[0011] A voltage regulation circuit electrically connected to the signal generation circuit; the signal generation circuit drives the voltage regulation circuit through the drive signal to adjust the output drive voltage;

[0012] An isolation switch electrically connected to the voltage regulation circuit and the signal generation circuit; the signal generation circuit controls the on-off of the isolation switch through the control signal; and

[0013] The switch driving circuit is electrically connected with the isolating switch and the switch module. The signal generating circuit drives the voltage regulating circuit through the driving signal, and outputs the driving voltage to the isolating switch. When the control signal is used to control the isolating switch to be turned on, the driving voltage drives the switch driving circuit, and the switch module is controlled to be turned on, so as to control the power supply to be turned on.

[0014] Preferably, the signal generating circuit comprises a controller and a driver. The controller is electrically connected with the isolating circuit and the driver. The driver is electrically connected with the voltage regulating circuit. The controller sends a square wave signal to the driver to control the driver to generate the driving signal. The controller is also electrically connected with the isolating switch. The controller sends a control signal to the isolating switch to control the on-off of the isolating switch.

[0015] Preferably, the signal generating circuit comprises a driving signal generating circuit and a control signal generating circuit. The driving signal generating circuit is electrically connected with the isolating circuit and the voltage regulating circuit. The control signal generating circuit is electrically connected with the isolating switch. The driving signal generating circuit generates the driving signal to drive the voltage regulating circuit to output the driving voltage. The control signal generating circuit generates the control signal to control the on-off of the isolating switch.

[0016] Preferably, the driving signal generating circuit comprises a square wave signal source electrically connected with the voltage regulating circuit. The square wave signal source generates the driving signal, which is a square wave signal. The control signal generating circuit comprises a control signal source and a switching switch electrically connected with the control signal source. The switching switch is electrically connected with the isolating switch. The control signal source generates the control signal. The switching switch controls the on-off of the control signal source to control the on-off of the isolating switch.

[0017] Preferably, the voltage regulating circuit comprises a magnetic ring transformer and a resonance capacitor. The magnetic ring transformer comprises a primary winding and a double secondary winding. The primary winding is electrically connected with the resonance capacitor. The double secondary winding is electrically connected with the isolating switch. The resonance capacitor is electrically connected with the signal generating circuit.

[0018] Preferably, the voltage regulating circuit further comprises a pair of rectifier diodes. One of the rectifier diodes is electrically connected with one of the double secondary windings. The other rectifier diode is electrically connected with the other secondary winding.

[0019] Preferably, the voltage regulating circuit further comprises a filter capacitor electrically connected between the double secondary windings and a ground terminal.

[0020] Preferably, the isolating switch includes an isolating optocoupler, which has an input terminal and an output terminal. The input terminal is electrically connected to the signal generation circuit, and the output terminal is electrically connected to the voltage regulation circuit and the switch driving circuit.

[0021] Preferably, the switch module includes a pair of switching transistors, which are electrically connected back-to-back.

[0022] Preferably, each of the switching transistors includes a first terminal, a second terminal, and a third terminal; the first terminal of a pair of switching transistors is electrically connected to the switch driving circuit, the second terminal of a pair of switching transistors is connected to the ground terminal, and the third terminal of a pair of switching transistors is electrically connected to the power supply connection terminal.

[0023] Preferably, the switching transistor includes an N-type MOS transistor.

[0024] Preferably, the switch driving circuit includes a pair of driving resistors, which are connected in parallel between the disconnect switch and the switch module.

[0025] Preferably, the switch driving circuit further includes a bleed resistor and a pair of driving resistors, wherein the bleed resistor is electrically connected between the pair of driving resistors and the ground terminal.

[0026] Preferably, the isolation circuit includes a voltage conversion circuit and a voltage regulator circuit electrically connected to the voltage conversion circuit. The voltage conversion circuit is electrically connected to the power supply connection terminal, and the voltage regulator circuit is electrically connected to the drive control circuit.

[0027] The power control circuit of this application includes a switching module, an isolation circuit, and a drive control circuit. The switching module is electrically connected to the power supply connection terminal, the isolation circuit is electrically connected to the power supply connection terminal, and the drive control circuit is electrically connected to the isolation circuit and the switching module. The isolation circuit converts AC power into DC power. When the drive control circuit receives the DC power, it generates a drive signal and adjusts the output drive voltage to control the switching of the switching module, thereby controlling the power supply. With this configuration, the power control circuit of this application controls the switching of the switching module by adjusting the output drive voltage using isolated DC power, thus controlling the AC power supply. It offers high isolation and safety, fast response speed, high accuracy, small size, long lifespan, and stable reliability. Attached Figure Description

[0028] Figure 1 The diagram shown is a schematic block diagram of one embodiment of the power control circuit of this application.

[0029] Figure 2 As shown Figure 1 A schematic block diagram of another embodiment of the power control circuit shown.

[0030] Figure 3 As shown Figure 2 The schematic diagram shows another embodiment of the power control circuit.

[0031] Figure 4 As shown Figure 3 The circuit diagram of the power control circuit shown is shown.

[0032] Figure 5 As shown Figure 2 A schematic block diagram of another embodiment of the power control circuit shown.

[0033] Figure 6 As shown Figure 5 The circuit diagram of the power control circuit shown is shown. Detailed Implementation

[0034] The power control circuit of this application will now be described in detail with reference to the accompanying drawings. Unless otherwise specified, the features of the following embodiments and implementations can be combined with each other.

[0035] Figure 1 The diagram shown is a schematic block diagram of one embodiment of the power control circuit 1 of this application. Figure 1 As shown, the power control circuit 1 includes a power connection terminal 10, a switching module 20, an isolation circuit 30, and a drive control circuit 40. The power connection terminal 10 is used to connect to a power source, specifically alternating current (AC). The power connection terminal 10 includes a live wire (L) and a neutral wire (N), used to connect to 220V AC. The switching module 20 is electrically connected to the power connection terminal 10. The switching module 20 is connected to the live wire (L) and is used to control the on / off state of the AC power, i.e., controlling the on / off state of the live wire (L). The isolation circuit 30 is electrically connected to the power connection terminal 10. The isolation circuit 30 is electrically connected to both the live wire (L) and the neutral wire (N). The isolation circuit 30 is used to convert AC power to DC power, serving as both voltage isolation and voltage conversion. The drive control circuit 40 is electrically connected to the isolation circuit 30 and the switching module 20. The DC power provided by the isolation circuit 30 powers the subsequent drive control circuit 40. The drive control circuit 40 generates a drive signal upon receiving DC power and adjusts the output drive voltage to control the on / off state of the switching module 20, thereby controlling the power supply's on / off state. The drive control circuit 40 controls the on / off state of the live wire L by controlling the on / off state of the switching module 20, thus controlling the power supply's on / off state. The power control circuit 1 of this application controls the on / off state of the switching module 20 by adjusting the output drive voltage using isolated DC power, thereby controlling the AC power supply's on / off state. It offers high isolation and safety, fast response, high precision, small size, long lifespan, and stable reliability. The power control circuit 1 of this application can be applied to power strip products, effectively controlling AC power supply and protecting downstream products and designs.

[0036] Figure 2 As shown Figure 1 A schematic block diagram of another embodiment of the power control circuit 1 shown. Figure 2 The illustrated embodiments and Figure 1 The illustrated embodiment is similar, with the main difference being that the drive control circuit 40 includes a signal generation circuit 41, a voltage regulation circuit 42, an isolating switch 43, and a switch drive circuit 44. The signal generation circuit 41 is electrically connected to the isolating circuit 30 and generates both drive and control signals. The voltage regulation circuit 42 is electrically connected to the signal generation circuit 41. The voltage regulation circuit 42 can receive the drive signal output from the signal generation circuit 41. The signal generation circuit 41 drives the voltage regulation circuit 42 through the drive signal, adjusting the output drive voltage. The isolating switch 43 is electrically connected to both the voltage regulation circuit 42 and the signal generation circuit 41. The isolating switch 43 can receive both the drive voltage output from the voltage regulation circuit 42 and the control signal output from the signal generation circuit 41. The signal generation circuit 41 controls the on / off state of the isolating switch 43 through the control signal. The switch drive circuit 44 is electrically connected to the isolating switch 43 and the switch module 20. The signal generation circuit 41 controls the on / off state of the isolating switch 43 through the control signal, thereby controlling whether the switch drive circuit 44 receives the drive voltage.

[0037] In this embodiment, when power supply needs to be turned on, the signal generation circuit 41 first outputs a drive signal, which preferentially drives the voltage regulation circuit 42 to adjust the output drive voltage. Then, the signal generation circuit 41 outputs a control signal that enables the isolating switch 43 to turn on, so that the drive voltage drives the switch drive circuit 44, controlling the switch module 20 to turn on, thereby controlling power supply to be turned on. When power supply needs to be turned off, the signal generation circuit 41 first outputs a control signal that enables the isolating switch 43 to turn off, preferentially controlling the isolating switch 43 to turn off, so that the drive voltage stops driving the switch drive circuit 44. Then, the signal generation circuit 41 stops outputting the drive signal, so that the voltage regulation circuit 42 stops outputting the drive voltage, thereby turning off the entire power control circuit 1.

[0038] Specifically, when the power needs to be turned on, the signal generating circuit 41 drives the voltage regulating circuit 42 through the driving signal, and outputs the driving voltage to the isolating switch 43. The isolating switch 43 is turned on by the control signal, and the driving voltage drives the switch driving circuit 44, and the switch module 20 is turned on to control the power to be turned on. When the power needs to be turned off, the signal generating circuit 41 controls the isolating switch 43 to be turned off through the control signal, so as to disconnect the switch driving circuit 44 and the voltage regulating circuit 42. Then, the signal generating circuit 41 stops generating the driving signal, and the voltage regulating circuit 42 stops outputting the driving voltage, so as to turn off the whole power control circuit 1. Moreover, the power control circuit 1 of the embodiment can be integrated on the same circuit board, and can be connected on the power line which needs to be controlled. The integration degree is high. The control of the on-off of the alternating current is effectively solved through the semiconductor device circuit, the service life, the reliability and the volume are improved.

[0039] It should be noted that, in the process of controlling the power to be turned on and turned off, the high and low levels of the control signal output by the signal generating circuit 41 are different, and the signal states are complementary, so as to turn on or turn off the isolating switch 43. Moreover, the signal generating circuit 41, the voltage regulating circuit 42, the isolating switch 43 and the switch driving circuit 44 jointly form the driving control circuit 40. Before the power is controlled to be turned on, the driving control circuit 40 can receive the direct current provided by the isolating circuit 30. After the power is controlled to be turned off, the isolating circuit 30 also continuously supplies power to the driving control circuit 40, so as to ensure that the driving control circuit 40 can normally work when the power needs to be turned on.

[0040] Figure 3 Another embodiment of the power control circuit 1 is shown in the principle block diagram. Figure 2 Another embodiment of the power control circuit 1 is shown in the principle block diagram. Figure 3 The embodiment shown in the principle block diagram Figure 2The illustrated embodiment is similar, the main difference is that the signal generating circuit 41 includes a controller 411 and a driver 412, the controller 411 is electrically connected with the isolation circuit 30, the driver 412 is electrically connected with the voltage regulating circuit 42, the controller 411 sends a square wave signal to the driver 412 to control the driver 412 to generate a driving signal. The controller 411 is also electrically connected with the isolation switch 43, and the controller 411 sends a control signal to the isolation switch 43 to control the on-off of the isolation switch 43. In this embodiment, the controller 411 can provide a square wave driving signal with fixed frequency and duty cycle to the driver 412 on the one hand; on the other hand, it can also output a control signal with high and low levels to the isolation switch 43. The driver 412 can be a driving chip that inputs a 3.3V square wave with fixed frequency and outputs a 5V square wave signal with the same frequency. The driver 412 is used to provide driving force to drive the switch driving circuit 44 to adjust the output driving voltage. When it is needed to control the power supply to be turned on, the controller 411 controls the driver 412 first, and then controls the isolation switch 43 to be turned on. When it is needed to turn off the power supply, the controller 411 controls the isolation switch 43 to be turned off first, and then stops controlling the driver 412. In this way, the isolation and safety are better.

[0041] Figure 4 As shown Figure 3 The circuit diagram of the power supply control circuit 1 is shown. As Figure 4 As shown, the isolation circuit 30 includes a voltage conversion circuit 31 and a voltage stabilizing circuit 32 electrically connected with the voltage conversion circuit 31, the voltage conversion circuit 31 is electrically connected with the power supply connection end 10, and the voltage stabilizing circuit 32 is electrically connected with the driving control circuit 40. In this embodiment, the voltage conversion circuit 31 can be an ACDC isolation power supply for converting alternating current into direct current, which is used to convert 220V alternating current into isolated 5V direct current and output to the voltage stabilizing circuit 32 to supply power to the voltage stabilizing circuit 32. The voltage stabilizing circuit 32 is electrically connected with the controller 411, and the voltage stabilizing circuit 32 can be a linear voltage stabilizer LDO, which is used to convert 5V direct current into 3.3V direct current and output to the controller 411 to supply power to the controller 411. In this way, the voltage conversion circuit 31 plays a main isolation role, and the voltage stabilizing circuit 32 plays a voltage conversion role. Through the cooperation of the voltage conversion circuit 31 and the voltage stabilizing circuit 32, stable 3.3V direct current is output to the controller 411, which ensures the stable operation of the controller 411, has high isolation and safety, is easy to implement, and has low cost.

[0042] In Figure 4In the shown embodiment, the voltage regulating circuit 42 comprises a magnetic ring transformer T1 and a resonance capacitor C1, the magnetic ring transformer T1 comprises a primary winding T11 and double secondary windings T12 and T13, the primary winding T11 is electrically connected with the resonance capacitor C1, the double secondary windings T12 and T13 are electrically connected with the isolating switch 43, and the resonance capacitor C1 is electrically connected with the signal generating circuit 41. In the embodiment, one end of the resonance capacitor C1 is electrically connected with the driver 412, the other end of the resonance capacitor C1 is electrically connected with the primary winding T11 of the magnetic ring transformer T1, and the primary winding T11 of the magnetic ring transformer T1 is further electrically connected with the ground terminal GND.

[0043] In the embodiment, the number of turns of each of the secondary windings T12 or T13 of the magnetic ring transformer T1 is consistent and greater than the number of turns of the primary winding T11 of the magnetic ring transformer T1. For example, the number of turns of the primary winding T11 of the magnetic ring transformer T1 can be 5 turns, and the number of turns of each of the secondary windings T12 or T13 can be 27 turns. The ratio of the number of turns of the primary winding T11 of the magnetic ring transformer T1 to the number of turns of the double secondary windings T12 and T13 can be 5:27:27. In actual application, the magnetic ring transformer T1 is under high frequency, when the driver 412 inputs a 5V square wave signal to the primary winding T11 of the magnetic ring transformer T1 through the resonance capacitor C1, the resonance capacitor C1 and the primary winding T11 of the magnetic ring transformer T1 form a resonance effect, so that the double secondary windings T12 and T13 of the magnetic ring transformer T1 output a voltage of 13.2V. In this way, the resonance capacitor C1 plays a role of direct current isolation. The magnetic ring transformer T1 plays a role of voltage increase. Through the cooperation of the resonance capacitor C1 and the magnetic ring transformer T1, a certain value of driving voltage can be output according to the square wave signal, so as to drive the switch driving circuit 44, thereby controlling the on-off of the switch module 20, and the isolation and safety are high, the circuit is simplified, the volume is miniaturized, and the implementation is easy and low in cost.

[0044] In other embodiments, the ratio of the number of turns of the primary winding T11 of the magnetic ring transformer T1 to the number of turns of the double secondary windings T12 and T13 can be other values, which can be set according to actual needs and are not limited in the present application.

[0045] In Figure 4In the embodiment shown, the voltage regulating circuit 42 further comprises a rectifier circuit, which functions as a rectifier and a protector. The rectifier circuit prevents the magnetic ring transformer T1 from being damaged by reverse current or overvoltage generated by the load. In the embodiment, the rectifier circuit comprises a pair of rectifier diodes D1 and D2. One of the rectifier diodes D1 is electrically connected to one of the secondary windings T12 of the double secondary windings T12 and T13, and the other rectifier diode D2 is electrically connected to the other secondary winding T13. Specifically, the anode of the rectifier diode D1 is electrically connected to the output terminal of the secondary winding T12, and the cathode of the rectifier diode D1 is electrically connected to the ground terminal GND. The anode of the rectifier diode D2 is electrically connected to the output terminal of the secondary winding T13, and the cathode of the rectifier diode D2 is electrically connected to the isolating switch 43 and the cathode of the rectifier diode D1. The pair of rectifier diodes D1 and D2 functions as a rectifier, which makes the circuit more stable.

[0046] In Figure 4 In the embodiment shown, the voltage regulating circuit 42 further comprises a filter capacitor C2, which is electrically connected between the double secondary windings T12 and T13 and the ground terminal GND. One end of the filter capacitor C2 is electrically connected to the double secondary windings T12 and T13 through the pair of rectifier diodes D1 and D2, and the other end of the filter capacitor C2 is electrically connected to the ground terminal GND. Specifically, the filter capacitor C2 is electrically connected between the cathodes of the pair of rectifier diodes D1 and D2 and the ground terminal GND. The filter capacitor C2 reduces the fluctuations and noise in the rectified voltage, provides stable and smooth direct current, and ensures that the voltage output by the power supply is as little affected by external interference as possible, meeting the needs of the circuit.

[0047] In Figure 4 In the embodiment shown, the isolating switch 43 comprises an isolating optocoupler U1, which comprises an input terminal U11 and an output terminal U12. The input terminal U11 is electrically connected to the signal generating circuit 41, and the output terminal U12 is electrically connected to the voltage regulating circuit 42 and the switch driving circuit 44. In the embodiment, the isolating optocoupler U1 comprises a light-emitting diode and a phototransistor. The light-emitting diode serves as the signal source of the input terminal U11 and is electrically connected to the controller 411. The phototransistor serves as the output terminal U12. The collector of the phototransistor is electrically connected to the secondary winding T13 of the magnetic ring transformer T1, and the emitter of the phototransistor is electrically connected to the switch driving circuit 44. The light-emitting diode and the phototransistor have an optical coupling medium between them, which transmits the light signal emitted by the light-emitting diode. The optical coupling medium is usually air or optically transparent material, which is not limited in the present application.

[0048] In actual application, when the controller 411 outputs a control signal capable of making the light-emitting diode emit light, the light-emitting diode can be driven to emit light. When the light-emitting diode emits light, the phototransistor receives the optical signal after passing through the optical coupling medium and converts it into an electrical signal, so that the isolation optical coupler U1 is turned on. After the isolation optical coupler U1 is turned on, the switch driving circuit 44 has a driving voltage, which can drive the switch module 20 to turn on, thereby controlling the power supply to turn on. Similarly, when the controller 411 outputs a control signal capable of making the light-emitting diode stop emitting light, the light-emitting diode can be controlled to be turned off, so that the isolation optical coupler U1 is turned off. At this time, the switch driving circuit 44 and the voltage regulating circuit 42 are turned off, and the switch driving circuit 44 has no driving voltage, so it cannot drive the switch module 20 to turn on, thereby controlling the power supply to turn off. The isolation optical coupler U1 plays an isolation role to isolate the high and low ends, and is driven from the low end and outputs a high voltage for driving the switch driving circuit 44. Here, the low end can be understood as a low voltage, and the high end can be understood as a high voltage, that is, the isolation optical coupler U1 is used to isolate the high voltage and the low voltage, and the driving voltage is output through the low voltage. In this way, the isolation optical coupler U1 realizes electrical isolation of the input and output circuits through light, which can effectively protect the circuit, has high signal isolation and safety, and can suppress noise interference.

[0049] In Figure 4 In the embodiment shown in the figure, the switch driving circuit 44 includes a pair of driving resistors R1 and R2, which are connected in parallel between the isolation switch 43 and the switch module 20. Specifically, the pair of driving resistors R1 and R2 are connected in parallel, one end of which is electrically connected to the emitter of the phototransistor, and the other end of which is electrically connected to the control end of the switch module 20. The resistance values of the pair of driving resistors R1 and R2 in this embodiment are the same. The switch driving circuit 44 adjusts the driving capability of the switch module 20 by arranging the pair of driving resistors R1 and R2, so that the switch module 20 generates less interference when it is turned on or turned off. Figure 4 In the embodiment shown in the figure, the switch driving circuit 44 further includes a bleeder resistor R3, which is electrically connected between the pair of driving resistors R1 and R2 and the ground terminal GND. The bleeder resistor R3 can safely consume or discharge the residual charge in the circuit, ensuring that the circuit will not be dangerous or unstable due to residual charge after power-off or shutdown, and has better safety.

[0050] In Figure 4In the illustrated embodiment, the switching module 20 includes a pair of switching transistors Q1 and Q2, which are electrically connected back-to-back. With the pair of transistors Q1 and Q2 connected back-to-back, one of them is turned on while the other is turned off. Each transistor operates for half a cycle, used to control the switching of AC power throughout the entire cycle. In this embodiment, the switching transistors are N-type MOSFETs. N-type MOSFETs have low on-resistance, fast switching speed, low power loss, and higher efficiency. Figure 4 In the illustrated embodiment, each switch Q1 or Q2 includes a first terminal, a second terminal, and a third terminal. The first terminal of a pair of switches Q1 and Q2 is electrically connected to the switch drive circuit 44, the second terminals of both switches Q1 and Q2 are connected to the ground terminal GND, and the third terminals of both switches Q1 and Q2 are electrically connected to the power supply connection terminal 10. Specifically, the first terminal of a pair of switches Q1 and Q2 can be the gate, and the gate of a pair of switches Q1 and Q2 is electrically connected to a pair of drive resistors R1 and R2. The second terminal of a pair of switches Q1 and Q2 can be the source, and the sources of a pair of switches Q1 and Q2 are interconnected and both connected to the ground terminal GND. The third terminal of a pair of switches Q1 and Q2 can be the drain, and the drain of a pair of switches Q1 and Q2 is electrically connected to the live wire L. A pair of switches Q1 and Q2 can be connected in series with the live wire L and controlled by the drive voltage to control the switching on and off of the live wire L.

[0051] When power supply needs to be controlled, voltage conversion circuit 31 generates an auxiliary source, isolating and generating 5V DC for use by voltage regulator circuit 32. Simultaneously, voltage regulator circuit 32 generates 3.3V DC for use by controller 411. Controller 411 first controls driver 412 to generate a pulsed square wave signal, driving resonant capacitor C1 and magnetic ring transformer T1, thus isolating the output drive voltage. Controller 411 then controls isolation optocoupler U1 to control the drive voltage entering switch drive circuit 44. Through the control of isolation optocoupler U1, switch drive circuit 44 is controlled to control a pair of switching transistors Q1 and Q2 to conduct, thereby controlling power supply conduction. Similarly, when power supply needs to be controlled to be disconnected, controller 411 first controls isolation optocoupler U1 to disconnect, stopping the drive voltage from entering switch drive circuit 44. Then, controller 411 controls driver 412 to stop generating pulsed square wave signals, causing magnetic ring transformer T1 to stop outputting drive voltage, controlling a pair of switching transistors Q1 and Q2 to disconnect, thereby controlling power supply disconnection. This setup provides high isolation and safety.

[0052] Figure 5 As shown Figure 2 A schematic block diagram of another embodiment of the power control circuit 1 shown. Figure 5 The illustrated embodiments and Figure 3The illustrated embodiment is similar, with the main difference being that the signal generation circuit 41 includes a drive signal generation circuit 413 and a control signal generation circuit 414. The drive signal generation circuit 413 is electrically connected to the isolation circuit 30 and the voltage regulation circuit 42. The control signal generation circuit 414 is electrically connected to the isolating switch 43. Specifically, the drive signal generation circuit 413 generates a drive signal to drive the voltage regulation circuit 42 to adjust the output drive voltage, and the control signal generation circuit 414 generates a control signal to control the on / off state of the isolating switch 43. Figure 3 Compared to the previous embodiment, the voltage regulation circuit 42 and the isolating switch 43 in this embodiment are controlled by different circuits, which provides greater flexibility.

[0053] Figure 6 As shown Figure 5 The circuit diagram of power control circuit 1 is shown. Figure 6 The illustrated embodiments and Figure 4 The illustrated embodiment is similar, with the main difference being that the drive signal generation circuit 413 includes a square wave signal source V1, electrically connected to the voltage regulation circuit 42. The square wave signal source V1 generates a drive signal, which is a square wave signal. The control signal generation circuit 414 includes a control signal source V2 and a switching switch K1 electrically connected to the control signal source V2. The switching switch K1 is electrically connected to the isolating switch 43. The control signal source V2 generates a control signal, and the switching switch K1 controls the on / off state of the control signal source V2 to control the on / off state of the isolating switch 43. Figure 4 Compared to the illustrated embodiment, in this embodiment, the square wave signal source V1 is electrically connected between the resonant capacitor C1 and the ground terminal GND. The square wave signal source V1 generates a square wave signal to drive the magnetic ring transformer T1. The control signal source V2, the switching switch K1, and the current-limiting resistor R4 are sequentially electrically connected between the input terminal U11 of the isolation optocoupler U1 and the ground terminal GND. The control signal source V2 generates a control signal, and the switching switch K1 controls the connection or disconnection of the control signal to control the on / off state of the isolation optocoupler U1. The current-limiting resistor R4 limits the current to control the magnitude of the current flowing through it, protecting other components in the circuit and preventing overcurrent damage to the isolation optocoupler U1, thus improving safety. Compared to the controller 411 and driver 412, the circuit structure is simpler, easier to implement, and lower in cost.

[0054] In practical application, square wave signal source V1 instead of the controller 411 output square wave 50us pulse, 100us cycle, amplitude 5V. Square wave signal source V1 output square wave, through the resonant capacitor C1 and the primary winding of magnetic ring transformer T1, so that the secondary winding produces a voltage of 13.2V. Switching switch K1 instead of the output port of the controller 411, closed, then control isolation optocoupler U1 conduction, control isolation optocoupler U1 input voltage, thereby controlling the output end of the on-off. When the isolation optocoupler U1 conduction, switch drive circuit 44 voltage, and then can drive a pair of switch Q1, Q2 conduction. The entire process described above on the connection of the AC switch Q1, Q2 pair of on-off, using completely isolated safety measures to control, isolation and security, improve the life and reliability of the product, reduce the product size.

[0055] It should be understood that the present application is not limited to what has been described herein above and illustrated in the drawings. The application can be modified in various ways which will be recognized by persons skilled in the art without departing from the scope of the application. The scope of the application is limited only by the claims which follow.

Claims

1. A power control circuit, characterized by comprising: The application relates to a power supply connection terminal for connecting a power supply, wherein the power supply is an alternating current; a switch module electrically connected to the power supply connection terminal; an isolation circuit electrically connected to the power supply connection terminal; the isolation circuit converts the alternating current into direct current; and a drive control circuit electrically connected to the isolation circuit and the switch module, the drive control circuit generates a drive signal when receiving the direct current, adjusts an output drive voltage, controls the on-off of the switch module, and controls the on-off of the power supply. The drive control circuit comprises: a signal generation circuit electrically connected to the isolation circuit, the signal generation circuit generates a drive signal and a control signal; a voltage adjustment circuit electrically connected to the signal generation circuit, the signal generation circuit drives the voltage adjustment circuit through the drive signal to adjust an output drive voltage; an isolation switch electrically connected to the voltage adjustment circuit and the signal generation circuit, the signal generation circuit controls the on-off of the isolation switch through the control signal; and a switch drive circuit electrically connected to the isolation switch and the switch module, the signal generation circuit drives the voltage adjustment circuit through the drive signal, and when the isolation switch outputs the drive voltage, the control signal is used to control the isolation switch to be turned on, the drive voltage is used to drive the switch drive circuit, the switch module is controlled to be turned on, and the power supply is controlled to be turned on. The signal generation circuit comprises a controller and a driver, the controller is electrically connected to the isolation circuit and the driver, the driver is electrically connected to the voltage adjustment circuit, the controller sends a square wave signal to the driver to control the driver to generate the drive signal; the controller is also electrically connected to the isolation switch, and the controller sends a control signal to the isolation switch to control the on-off of the isolation switch. The signal generation circuit comprises a drive signal generation circuit and a control signal generation circuit, the drive signal generation circuit is electrically connected to the isolation circuit and the voltage adjustment circuit, and the control signal generation circuit is electrically connected to the isolation switch; wherein the drive signal generation circuit generates the drive signal to drive the voltage adjustment circuit to adjust the output of the drive voltage, and the control signal generation circuit generates the control signal to control the on-off of the isolation switch. The drive signal generation circuit comprises a square wave signal source electrically connected to the voltage adjustment circuit, the square wave signal source generates the drive signal, and the drive signal is a square wave signal; the control signal generation circuit comprises a control signal source and a switching switch electrically connected to the control signal source, the switching switch is electrically connected to the isolation switch, the control signal source generates the control signal, and the switching switch controls the on-off of the control signal source to control the on-off of the isolation switch. ​ 2. The power control circuit of claim 1, wherein ​ ​ ​ ​ ​ 3. The power control circuit of claim 2, wherein ​ ​ 4. The power control circuit of claim 2, wherein ​ 5. The power control circuit of claim 4, wherein, ​ 6. The power control circuit of claim 2, wherein The voltage regulating circuit comprises a magnetic ring transformer and a resonance capacitor, the magnetic ring transformer comprises a primary winding and a double secondary winding, the primary winding is electrically connected with the resonance capacitor, the double secondary winding is electrically connected with the isolating switch, and the resonance capacitor is electrically connected with the signal generating circuit.

7. The power control circuit of claim 6, wherein, The voltage regulating circuit further comprises a pair of rectifier diodes, one of the rectifier diodes is electrically connected with one of the secondary windings, and the other rectifier diode is electrically connected with the other secondary winding; and / or The voltage regulating circuit further comprises a filter capacitor electrically connected between the double secondary winding and a ground terminal.

8. The power control circuit of claim 2, wherein, The isolating switch comprises an isolating optocoupler, the isolating optocoupler comprises an input terminal and an output terminal, the input terminal is electrically connected with the signal generating circuit, and the output terminal is electrically connected with the voltage regulating circuit and the switch driving circuit.

9. The power control circuit of claim 2, wherein, The switch module comprises a pair of switch tubes, the pair of switch tubes are electrically connected back to back; Each of the switch tubes comprises a first terminal, a second terminal and a third terminal, the first terminals of the pair of switch tubes are electrically connected with the switch driving circuit, the second terminals of the pair of switch tubes are both connected to a ground terminal, and the third terminals of the pair of switch tubes are both electrically connected with the power supply connection terminal; and / or The switch tubes comprise N-type MOS tubes.

10. The power control circuit of claim 2, wherein, The switch driving circuit comprises a pair of driving resistors, the pair of driving resistors are connected in parallel between the isolating switch and the switch module; and / or The switch driving circuit further comprises a bleeder resistor and a pair of driving resistors, the bleeder resistor is electrically connected between the pair of driving resistors and a ground terminal; and / or The isolating circuit comprises a voltage conversion circuit and a voltage stabilizing circuit electrically connected with the voltage conversion circuit, the voltage conversion circuit is electrically connected with the power supply connection terminal, and the voltage stabilizing circuit is electrically connected with the driving control circuit.

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