CN-111509955-B - Switch control circuit, intelligent switch and switch control method

CN111509955BCN 111509955 BCN111509955 BCN 111509955BCN-111509955-B

Abstract

The application provides a switch control circuit, an intelligent switch and a switch control method. The switch control circuit comprises a transformation circuit, a power management circuit and a control circuit, wherein the transformation circuit is connected with a rectifying circuit and is used for providing power for a power supply by means of a rectified electric signal output by the rectifying circuit, the transformation circuit comprises a primary side input unit and a secondary side output unit, the primary side input unit is connected with the rectifying circuit, the power management circuit is at least connected with the primary side input unit and is used for acquiring a first sampling signal used for reflecting the power supply during the disconnection period of the switch circuit and controlling current flowing through the primary side input unit based on the first sampling signal so that the power supply provided by the secondary side output unit is stable, the control circuit is used for providing power for the power supply by means of the rectified electric signal continuously during the conduction period of the switch circuit, and the control circuit is used for controlling the switch circuit to conduct or break the power supply after receiving control information under the power supply support of the power supply. The application achieves the object of providing an internal supply of power both during the off-period and during the on-period of the switching circuit.

Inventors

SUN SHUNGEN
HANG ZHONGJIAN
JIANG RULONG
WU SHENGHONG

Assignees

上海晶丰明源半导体股份有限公司
上海晶丰明源半导体股份有限公司

Dates

Publication Date: 20260421
Application Date: 20190131
Priority Date: 20190131

Claims (20)

1. A switch control circuit for controlling a switch circuit, said switch circuit being connected to a line loop in which a load is located, said switch control circuit comprising: the power supply circuit comprises a rectifying circuit, a voltage transformation circuit and a power supply circuit, wherein the voltage transformation circuit is connected with the rectifying circuit and is used for supplying power to the power supply by means of a rectified electrical signal output by the rectifying circuit; The power supply management circuit is connected with at least the primary side input unit, and is used for acquiring a first sampling signal for reflecting a power supply signal output by the power supply during the disconnection period of the switch circuit, controlling current flowing through the primary side input unit based on the first sampling signal so that the power supply output by the secondary side output unit is stable, and continuously providing power supply for the power supply by means of the rectified electric signal during the connection period of the switch circuit; The control circuit is used for controlling the switching circuit to be switched on or off after receiving control information under the power supply support of the power supply; The rectified electrical signal received by the power management circuit comprises a second rectified electrical signal obtained by rectifying alternating current flowing through the switch circuit based on the rectifying circuit; the power management circuit correspondingly comprises a continuous power supply unit which is used for continuously providing power supply for the power supply by utilizing the second rectified electrical signal during the conduction period of the switch circuit.
2. The switch control circuit according to claim 1, wherein the rectified electrical signal received by the primary side input unit includes a first rectified electrical signal obtained by rectifying an alternating current flowing to the switch circuit by the rectifying circuit; The power management circuit correspondingly comprises a control unit, is electrically connected with the primary side input unit and is used for acquiring the first sampling signal during the disconnection period of the switch circuit and controlling the current flowing through the primary side input unit based on the first sampling signal.
3. The switch control circuit according to claim 2, wherein the control unit includes: the adjusting module is positioned on the line between the primary side input unit and the voltage ground and is used for controlling the on-off or current change of the line between the primary side input unit and the voltage ground; and the control module is connected with the adjusting module and used for controlling the adjusting module based on the first sampling signal.
4. A switch control circuit according to claim 3, wherein the control module comprises: the detection sub-module is used for outputting a detection signal by detecting the first sampling signal; And the control sub-module is connected with the detection sub-module and used for controlling the adjusting module based on the detection signal.
5. The switch control circuit of claim 4, wherein the detection sub-module comprises any one of: A comparison sub-circuit for comparing the voltage of the first sampling signal with a preset reference voltage and outputting a detection signal based on the comparison result; And the differential sub-circuit is used for generating an error signal of a voltage difference between the voltage of the first sampling signal and a preset reference voltage and outputting a detection signal based on the error signal.
6. The switch control circuit of claim 4, wherein the control submodule controls at least one of a current change frequency, an on-off frequency, an on-time period, and an off-time period of the regulation module based on the detection signal.
7. The switch control circuit according to claim 2, wherein the control unit further acquires a third sampling signal reflecting a line electrical signal in a line where the primary side input unit is located, and controls a current flowing in the primary side input unit based on the first sampling signal and the third sampling signal.
8. The switch control circuit of claim 7, wherein the control unit controls the line on which the primary input unit is located to be on based on the first sampling signal, and controls the line on which the primary input unit is located to be off based on the first sampling signal and the third sampling signal.
9. The switch control circuit of claim 1 wherein the secondary side output unit comprises a secondary side winding connected to a voltage ground and a unidirectional conduction module connected to an output of the secondary side winding.
10. The switch control circuit of claim 9, wherein the unidirectional conduction module comprises a diode or the unidirectional conduction module comprises a diode and a capacitance connected between the diode and voltage ground.
11. The switch control circuit of claim 1, further comprising a first self-powered circuit for powering the power management circuit via the power supply during an off-period of the switch circuit.
12. The switch control circuit of claim 11, wherein the first self-powered circuit comprises a diode connected to the output of the secondary side output unit and a capacitor connected between the diode and voltage ground.
13. The switch control circuit of claim 11, wherein the first self-powered circuit is external between the secondary side output unit and a power pin of the power management circuit, or wherein at least a portion of the devices in the first self-powered circuit are integrated in the power management circuit.
14. The switch control circuit of claim 2, further comprising a first sampling circuit coupled between the secondary side output unit and the power management circuit for sampling an output side of the secondary side output unit and generating a first sampled signal.
15. The switch control circuit according to claim 14, wherein the first sampling circuit is integrated in the power management circuit, and outputs the sampled first sampling signal to the control unit.
16. The switching control circuit according to claim 1, further comprising a selection circuit provided on an ac line on an output side of the switching circuit for selectively switching the switching circuit on the first line or the second line during a switching-on period of the switching circuit to constitute respective energizing circuits, respectively; and the continuous power supply unit is used for converting the acquired second rectified electric signal into a power supply signal when the selection circuit is switched to the second circuit so as to continuously supply power to the power supply.
17. The switch control circuit according to claim 16, further comprising a second sampling circuit for sampling an electric signal reflecting an alternating current electric signal in the second line or a power supply signal of a sampling power supply to generate a second sampling signal and outputting the second sampling signal to the successive power supply unit, wherein the successive power supply unit includes, correspondingly: The shunt control module is connected with the selection circuit and used for outputting a shunt control signal to the selection circuit by detecting the second sampling signal so as to control the selection circuit to switch between the first circuit and the second circuit; And the output module is connected with the rectifying circuit and is used for continuously providing power for the power supply based on the received second rectified electrical signal.
18. The switch control circuit of claim 17, wherein the shunt control module comprises: the comparison sub-circuit is used for comparing the voltage of the second sampling signal with a reference voltage interval and generating a corresponding comparison result; And the control sub-circuit is connected with the comparison sub-circuit and is used for outputting the shunt control signal based on the comparison result so as to control the selection circuit to switch from the second circuit to the first circuit.
19. The switch control circuit of claim 18 wherein the control sub-circuit includes a timer for counting based on the received comparison and adjusting the shunt control signal to control the switching of the selection circuit from the first line to the second line when the count reaches a count threshold.
20. The switch control circuit of claim 19, wherein the timing threshold is a fixed time threshold or is set based on the selection circuit selecting the duration of the first line during at least one switching period.

Description

Switch control circuit, intelligent switch and switch control method Technical Field The present application relates to the field of circuit control technologies, and in particular, to a switch control circuit, an intelligent switch, and a switch control method. Background The intelligent household appliance is a household appliance product formed by introducing a microprocessor, a sensor technology and a network communication technology into household appliances, has the functions of automatically sensing the space state of the house and the state of the household appliance, automatically controlling and receiving control information of a house user in the house or remotely, and simultaneously, the intelligent household appliance is used as a component part of the intelligent household appliance, can be interconnected with other household appliances, houses and facilities in the house to form a system, and realizes the function of the intelligent household appliance. At present, common remote control devices for intelligent home appliances, such as universal remote controllers and mobile terminals, are controlled by integrating control information, and the remote control devices do not relate to an installation circuit of the intelligent home appliance, so that the intelligent home appliance has a standby state so as to process the received control information in time. Along with the increase of intelligent household electrical appliances, a panel type intelligent switch integrates control management on intelligent household electrical appliances and traditional household electrical appliances, thereby overcoming the defect that a remote control device cannot control the traditional household electrical appliances, but also generating a new internal power supply problem. Disclosure of Invention In view of the above-mentioned drawbacks of the prior art, an object of the present application is to provide a switch control circuit, an intelligent switch and a switch control method for solving the power supply problem of the intelligent switch during the operation and non-operation of the electric appliance controlled by the intelligent switch in the prior art. To achieve the above and other related objects, a first aspect of the present application provides a switch control circuit for controlling a switch circuit connected to a line loop where a load is located, wherein the switch control circuit includes a transformer circuit connected to a rectifier circuit for supplying power to a power supply by a rectified electrical signal output by the rectifier circuit, wherein the transformer circuit includes a primary input unit and a secondary output unit, wherein the primary input unit is connected to the rectifier circuit, a power management circuit connected to at least the primary input unit, the power management circuit for acquiring a first sampling signal reflecting a power supply signal output by the power supply during a period when the switch circuit is turned off, and controlling a current flowing through the primary input unit based on the first sampling signal so that the power supply output by the secondary output unit is stable, and for supplying power to the power supply by the rectified electrical signal during a period when the switch circuit is turned on, and a control circuit for controlling the switch circuit to be turned on or off after receiving control information of the power supply. The second aspect of the application provides an intelligent switch, wherein the intelligent switch is used for being connected to an alternating current wire where a load is located, and the intelligent switch comprises a switching circuit, a rectifying circuit and a switch control circuit, wherein the switching circuit is connected to the alternating current wire and is controlled to be conducted or disconnected, the rectifying circuit is used for rectifying the connected alternating current and outputting a rectified electric signal respectively during the disconnection period and the conduction period of the switching circuit, and the switch control circuit is connected to the rectifying circuit and controls the switching circuit. The third aspect of the application provides a switch control method for controlling a switch circuit, the switch circuit and a load are connected to an alternating current circuit, wherein the switch control method comprises the steps of acquiring a first sampling signal for reflecting a power supply provided by a secondary side output unit of a transformer circuit during the disconnection period of the switch circuit, and controlling current in a primary side input unit of the transformer circuit based on the first sampling signal, wherein the transformer circuit provides power for the power supply by means of a rectified electrical signal provided by a rectifying circuit, and provides power for the power supply by means of the received rectified electrical signal during the con