Load control circuits and electronic equipment

Abstract

This application discloses a load control circuit and electronic device. The load control circuit includes a controller and two load control modules, or a controller, two load control modules, and two level conversion modules. Each load control module includes a signal selection unit, a rectification unit, an energy storage unit, and a switching unit. The controller outputs a control signal; the signal selection unit selects an AC signal for output; the rectification unit rectifies the AC signal; the energy storage unit generates a drive voltage; and the switching unit turns on in response to the drive voltage. The two level conversion modules include a first level conversion module and a second level conversion module. The first level conversion module converts a high level at a first connection point to a low level and inputs it to the corresponding switching unit; the second level conversion module converts a high level at a second connection point to a low level and inputs it to the corresponding switching unit; the switching unit turns off in response to a low level. This design allows for application in various scenarios and provides strong anti-interference capabilities.

Description

Technical Field

[0001] This application relates to the field of electronic circuit technology, and in particular to a load control circuit and electronic device. Background Technology

[0002] For some electronic devices with two loads (such as two heaters), like air fryers, there are usually two versions: European and American. The European version requires both loads to work simultaneously, while the American version requires each load to work independently, i.e., they cannot work simultaneously.

[0003] Currently, to meet European and American standards, software is typically used to control the power supply to the loads, allowing two loads to operate simultaneously or at different times. However, this method has poor interference immunity. Utility Model Content

[0004] This application provides a load control circuit and electronic device that can be applied to various application scenarios and has strong anti-interference capabilities.

[0005] In a first aspect, embodiments of this application provide a load control circuit, comprising: a controller and two load control modules, or a controller, two load control modules, and two level conversion modules; the load control module includes a signal selection unit, a rectifier unit, an energy storage unit, and a switching unit; the controller is connected to a first terminal of the signal selection unit, a second terminal of the signal selection unit is connected to a first terminal of the rectifier unit, a second terminal of the rectifier unit is connected to the first terminal of the energy storage unit and the first terminal of the switching unit, a second terminal of the switching unit is connected to an input power supply, and a third terminal of the switching unit is connected to the load; the controller is used to output a control signal; the signal selection unit is used to select an AC signal from the control signal for output; the rectifier unit is used to rectify the AC signal and output a DC signal; the energy storage unit is used to store energy based on the DC signal to generate a driving voltage; the switching unit is used to conduct in response to the driving voltage to establish a connection between the input power supply and the load; the two load control modules include a first load control module and a second load control module, in which the second terminal of the rectifier unit is connected to the first terminal of the energy storage unit. The first terminal of the rectifier unit and the first terminal of the switching unit are connected to the first connection point. In the second load control module, the second terminal of the rectifier unit is connected to the first terminal of the energy storage unit and the first terminal of the switching unit at the second connection point. The two level conversion modules include a first level conversion module and a second level conversion module. The first level conversion module is connected to the first connection point and the switching unit in the second load control module, respectively. The first level conversion module is used to convert the high level of the first connection point to a low level and input it to the switching unit in the second load control module. The second level conversion module is connected to the second connection point and the switching unit in the first load control module, respectively. The second level conversion module is used to convert the high level of the second connection point to a low level and input it to the switching unit in the first load control module. In the first load control module, the switching unit is turned off in response to the low level output by the second level conversion module to disconnect the connection between the input power supply and the load. In the second load control module, the switching unit is turned off in response to the low level output by the first level conversion module to disconnect the connection between the input power supply and the load.

[0006] In one or more embodiments, the signal selection unit includes a first capacitor; the first capacitor is connected between the controller and a first terminal of the rectifier unit.

[0007] In one or more embodiments, the rectifier unit includes a first diode; the anode of the first diode is connected to a second terminal of the signal selection unit, and the cathode of the first diode is connected to a first terminal of the energy storage unit and the switching unit, respectively; wherein, in the first load control module, the cathode of the first diode is connected to the first terminal of the energy storage unit and the switching unit at the first connection point, and in the second load control module, the cathode of the first diode is connected to the first terminal of the energy storage unit and the switching unit at the second connection point.

[0008] In one or more embodiments, the energy storage unit includes a second capacitor; the second capacitor is connected between a first terminal of the rectifier unit and ground.

[0009] In one or more embodiments, the switching unit includes a first switch and a relay; a first end of the first switch is connected to a second end of the rectifier unit and the energy storage unit respectively; a second end of the first switch is connected to a first end of the coil of the relay; a second end of the coil of the relay is connected to a first power supply; a first end of a pair of normally open contacts of the relay is connected to the live wire of the input power supply; and a second end of a pair of normally open contacts of the relay is connected to a first end of the load.

[0010] In one or more embodiments, the switching unit further includes a second switch; a first end of the second switch is connected to a second end of the rectifier unit and the energy storage unit respectively, a second end of the second switch is connected to a first end of the coil of the relay, and a third end of the second switch is connected to a second end of the first switch; wherein, the first end of the first switch is the first end of the switching unit, the first end of a pair of normally open contacts of the relay is the second end of the switching unit, the second end of a pair of normally open contacts of the relay is the third end of the switching unit, the first end of the second switch is the fourth end of the switching unit, the first end of the coil of the relay is the fifth end of the switching unit, and the second end of the coil of the relay is the sixth end of the switching unit.

[0011] In one or more embodiments, both the first switch and the second switch are NPN transistors; the first terminal of the first switch and the first terminal of the second switch are the bases of the NPN transistors, the second terminal of the first switch and the second terminal of the second switch are the collectors of the NPN transistors, and the third terminal of the first switch and the third terminal of the second switch are the emitters of the NPN transistors.

[0012] In one or more embodiments, the load control module further includes a second diode, a third diode, a first resistor, a second resistor, a third resistor, a fourth resistor, a third capacitor, and a fourth capacitor; the anode of the second diode is grounded, the cathode of the second diode is connected to the second terminal of the signal selection unit and the first terminal of the rectifier unit, the first terminal of the first resistor is connected to the first terminal of the second resistor, the second terminal of the rectifier unit, and the energy storage unit at the first connection point, the second terminal of the first resistor is grounded, the second terminal of the second resistor is connected to the first terminal of the third resistor and the first terminal of the fourth resistor, the second terminal of the third resistor is connected to the first terminal of the third capacitor and the first terminal of the switching unit, the second terminal of the fourth resistor is connected to the fourth terminal of the switching unit, the first terminal of the fourth capacitor is connected to the fifth terminal of the switching unit and the anode of the third diode, and the second terminal of the fourth capacitor is connected to the sixth terminal of the switching unit and the cathode of the third diode.

[0013] In one or more embodiments, the level conversion module includes a third switch, a fifth resistor, and a sixth resistor; the sixth resistor is connected between a first terminal and a third terminal of the third switch, and the third terminal of the third switch is grounded; in the first level conversion module, the first terminal of the third switch is connected to a first connection point through the fifth resistor, and the second terminal of the third switch is connected to a fourth connection point, wherein, in the second load control module, the connection point between the second terminal of the second resistor, the first terminal of the third resistor, and the first terminal of the fourth resistor is the fourth connection point; in the second level conversion module, the first terminal of the third switch is connected to the second connection point through the fifth resistor, and the second terminal of the third switch is connected to a third connection point, wherein, in the first load control module, the connection point between the second terminal of the second resistor, the first terminal of the third resistor, and the first terminal of the fourth resistor is the third connection point.

[0014] Secondly, embodiments of this application provide an electronic device, including a first load, a second load, and a load control circuit as described above; a first load control module in the load control circuit is connected to the first load to control the first load to be powered on or de-powered; a second load control module in the load control circuit is connected to the second load to control the second load to be powered on or de-powered.

[0015] The beneficial effects of this application are as follows: The load control circuit of this application embodiment includes a controller and two load control modules, or a controller, two load control modules, and two level conversion modules. The load control module includes a signal selection unit, a rectifier unit, an energy storage unit, and a switching unit. The controller is connected to the first terminal of the signal selection unit, the second terminal of the signal selection unit is connected to the first terminal of the rectifier unit, the second terminal of the rectifier unit is connected to the first terminals of the energy storage unit and the switching unit, the second terminal of the switching unit is connected to the input power supply, and the third terminal of the switching unit is connected to the load. When two loads need to work simultaneously, the load control circuit includes a controller and two load control modules. In the first and second load control modules, the controller outputs a control signal, the signal selection unit selects an AC signal from the control signal for output, the rectifier unit rectifies the AC signal and outputs a DC signal, and the switching unit responds to the driving voltage to establish a connection between the input power supply and the load. That is, the connection between the input power supply and both loads is established, and the two loads work simultaneously. When two loads need to work only individually, the load control circuit includes a controller, two load control modules, and two level conversion modules. When a load control module receives a control signal first, its signal selection unit selects the AC signal output from the control signal. The rectifier unit rectifies the AC signal and outputs a DC signal. The switching unit turns on in response to the drive voltage to establish a connection between the input power supply and the load. Simultaneously, the level conversion module corresponding to the load control module that received the control signal first outputs a low level to the load control module that received the control signal later, causing the switching unit in the latter load control module to turn off. Thus, only the switching unit in the load control module that received the control signal first establishes a connection between the input power supply and the load. Through this process, this load control circuit can be applied to scenarios where two loads operate simultaneously, as well as scenarios where only one load can operate. Therefore, this load control circuit can be applied to various application scenarios. Furthermore, since the signal selection unit only selects the AC signal output, when the controller output signal is interfered with and remains at a high or low level, the switching unit will not establish a connection between the input power supply and the load, meaning the load will not malfunction. This demonstrates that the load control circuit has strong anti-interference capabilities. Attached Figure Description

[0016] One or more embodiments are illustrated by way of example with reference to the accompanying drawings, which are not intended to limit the embodiments, and elements having the same reference numerals in the drawings are designated as similar elements.

[0017] Figure 1 This is a schematic diagram of the electronic device provided in the embodiments of this application. Figure 1 ;

[0018] Figure 2 This is a schematic diagram of the electronic device provided in the embodiments of this application. Figure 2 ;

[0019] Figure 3 This is a schematic diagram of the circuit structure of the load control circuit provided in the embodiments of this application. Figure 1 ;

[0020] Figure 4 This is a schematic diagram of the electronic device provided in the embodiments of this application. Figure 3 ;

[0021] Figure 5 This is a schematic diagram of the electronic device provided in the embodiments of this application. Figure 4 ;

[0022] Figure 6 This is a schematic diagram of the circuit structure of the load control circuit provided in the embodiments of this application. Figure 2 ;

[0023] Figure 7 It is a schematic diagram of a circuit structure used in related technologies to enable two loads to work simultaneously or at different times. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and thoroughly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0025] It should be noted that when an element is described as "connected" to another element, it can be directly connected to the other element, or there can be one or more intermediate elements between them.

[0026] Furthermore, the technical features involved in the various embodiments of this application described below can be combined with each other as long as they do not conflict with each other.

[0027] Please refer to Figure 1 , Figure 1 This is a schematic diagram of an electronic device provided in an embodiment of this application. For example... Figure 1 As shown, the electronic device 1000 includes a load control circuit 100, a first load 200, and a second load 300. In some embodiments, the electronic device 1000 is an air fryer.

[0028] Here, the first load 200 and the second load 300 refer to electrical loads, specifically devices or apparatuses that consume electrical energy to perform a certain task. In some embodiments, both the first load 200 and the second load 300 are heaters.

[0029] The load control circuit 100 includes two load control modules and a controller 130. The two load control modules include a first load control module 110, a second load control module 120, and a controller 130. The first load control module 110 is connected to the first load 200 and is used to control the first load 200 to be powered on or off. The second load control module 120 is connected to the second load 200 and is used to control the second load 300 to be powered on or off.

[0030] The controller 130 can be a microcontroller unit (MCU) or a digital signal processing (DSP) controller, etc.

[0031] In this embodiment, when the first load control module 110 controls the first load 200 to be powered, the second load control module 120 also controls the second load 300 to be powered, thereby enabling the first load 200 and the second load 300 to be powered at the same time and to work simultaneously.

[0032] In some embodiments, any load control module includes a signal selection unit, a rectification unit, an energy storage unit, and a switching unit. A controller is connected to a first terminal of the signal selection unit, a second terminal of the signal selection unit is connected to a first terminal of the rectification unit, a second terminal of the rectification unit is connected to the first terminals of both the energy storage unit and the switching unit, a second terminal of the switching unit is connected to the input power supply, and a third terminal of the switching unit is connected to the load. The controller outputs a control signal. The signal selection unit selects an AC signal from the control signal for output. The rectification unit rectifies the AC signal and outputs a DC signal. The energy storage unit stores energy based on the DC signal to generate a drive voltage. The switching unit turns on in response to the drive voltage to establish a connection between the input power supply and the load.

[0033] Specifically, such as Figure 2As shown, the first load control module 110 includes a first signal selection unit 111, a first rectifier unit 112, a first energy storage unit 113, and a first switch unit 114. A controller 130 is connected to the first terminal of the first signal selection unit 111. The second terminal of the first signal selection unit 111 is connected to the first terminal of the first rectifier unit 112. The second terminal of the first rectifier unit 112 is connected to the first terminals of both the first energy storage unit 113 and the first switch unit 114, and is connected to a first connection point P1. The second terminal of the first switch unit 114 is connected to the input power supply 2000, and the third terminal of the first switch unit 114 is connected to the first load 200. The controller 130 outputs a control signal, which includes a first sub-signal and a second sub-signal. The first sub-signal is input to the first signal selection unit 111. The first signal selection unit 111 selects the AC signal (denoted as the first AC signal) from the first sub-signal for output. The first rectifier unit 112 rectifies the first AC signal and outputs a DC signal (denoted as the first DC signal). The first energy storage unit 113 is used to store energy based on the first DC signal to generate a driving voltage (denoted as the first driving voltage). The first switching unit 114 is used to turn on in response to the first driving voltage to establish a connection between the input power supply 2000 and the first load 200.

[0034] The second load control module 120 includes a second signal selection unit 121, a second rectification unit 122, a second energy storage unit 123, and a second switching unit 124. The controller 130 is connected to the first terminal of the second signal selection unit 121. The second terminal of the second signal selection unit 121 is connected to the first terminal of the second rectification unit 122. The second terminal of the second rectification unit 122 is connected to the first terminals of the second energy storage unit 123 and the second switching unit 124, respectively, and connected to the second connection point P2. The second terminal of the second switching unit 124 is connected to the input power supply 2000, and the third terminal of the second switching unit 124 is connected to the second load 300. A second sub-signal output by the controller 130 is input to the second signal selection unit 121. The second signal selection unit 121 is used to select the AC signal (denoted as the second AC signal) from the second sub-signal for output. The second rectification unit 122 is used to rectify the second AC signal and output a DC signal (denoted as the second DC signal). The second energy storage unit 123 is used to store energy based on the second DC signal to generate a driving voltage (denoted as the second driving voltage). The second switching unit 124 is turned on in response to the second driving voltage to establish a connection between the input power supply 2000 and the second load 300.

[0035] When the controller 130 outputs the first sub-signal and the second sub-signal, the above process enables the establishment of a connection between the input power supply 2000 and the first load 200, as well as a connection between the input power supply 2000 and the second load 300. Thus, both the first load 200 and the second load 300 are powered, and both the first load 200 and the second load 300 work simultaneously.

[0036] Figure 3 An example is shown with Figure 2 The block diagram of the load control circuit shown corresponds to one type of circuit structure. For example... Figure 3 As shown, both the first signal selection unit 111 and the second signal selection unit 121 include a first capacitor C1. In the first load control module 110, the first capacitor C1 is connected between the controller 130 and the first terminal of the first rectifier unit 112; in the second load control module 120, the first capacitor C1 is connected between the controller 130 and the first terminal of the second rectifier unit 122.

[0037] In some embodiments, both the first rectifier unit 112 and the second rectifier unit 122 include a first diode D1. In the first load control module 110, the anode of the first diode D1 is connected to the second terminal of the first signal selection unit 111, and the cathode of the first diode D1 is connected to the first terminals of the first energy storage unit 113 and the first switching unit 114, respectively. The cathode of the first diode D1 is connected to the first terminals of the first energy storage unit 113 and the first switching unit 114 at a first connection point P1. In the second load control module 120, the anode of the first diode D1 is connected to the second terminal of the second signal selection unit 121, and the cathode of the first diode D1 is connected to the first terminals of the second energy storage unit 123 and the second switching unit 124, respectively. The cathode of the first diode D1 is connected to the first terminals of the second energy storage unit 123 and the second switching unit 124 at a second connection point P2.

[0038] In some embodiments, both the first energy storage unit 113 and the second energy storage unit 123 include a second capacitor C2. In the first load control module 110, the second capacitor C2 is connected between the first terminal of the first rectifier unit 112 and ground GND; in the second load control module 120, the second capacitor C2 is connected between the first terminal of the second rectifier unit 122 and ground GND.

[0039] In some embodiments, both the first switching unit 114 and the second switching unit 124 include a first switch Q1 and a relay KM1. In the first load control module 110, the first end of the first switch Q1 is connected to the second end of the first rectifier unit 112 and the first energy storage unit 113, respectively. The second end of the first switch Q1 is connected to the first end of the coil M1 of the relay KM1. The second end of the coil M1 of the relay KM1 is connected to the first power supply V1. The first end of a pair of normally open contacts K1 of the relay KM1 is connected to the live wire ACL of the input power supply 2000. The second end of a pair of normally open contacts K1 of the relay KM1 is connected to the first end of the first load 200. The second end of the first load 200 is connected to the neutral wire of the input power supply 2000. In the second load control module 120, the first end of the first switch Q1 is connected to the second end of the second rectifier unit 122 and the second energy storage unit 123 respectively. The second end of the first switch Q1 is connected to the first end of the coil M1 of the relay KM1. The second end of the coil M1 of the relay KM1 is connected to the first power supply V1. The first end of a pair of normally open contacts K1 of the relay KM1 is connected to the live wire ACL of the input power supply 2000. The second end of a pair of normally open contacts K1 of the relay KM1 is connected to the first end of the second load 300. The second end of the second load 300 is connected to the neutral wire of the input power supply 2000.

[0040] In some embodiments, both the first switching unit 114 and the second switching unit 124 further include a second switch Q2. In the first load control module 110, the first end of the second switch Q2 is connected to the second end of the first rectifier unit 112 and the first energy storage unit 113, respectively. The second end of the second switch Q2 is connected to the first end of the coil M1 of the relay KM1. The third end of the second switch Q2 is connected to the second end of the first switch Q1. The first end of the first switch Q1 is the first end of the first switching unit 114. The first end of a pair of normally open contacts K1 of the relay KM1 is the second end of the first switching unit 114. The second end of a pair of normally open contacts K1 of the relay KM1 is the third end of the first switching unit 114. The first end of the second switch Q2 is the fourth end of the first switching unit 114. The first end of the coil M1 of the relay KM1 is the fifth end of the first switching unit 114. The second end of the coil M1 of the relay KM1 is the sixth end of the first switching unit 114. In the second load control module 120, the first end of the second switch Q2 is connected to the second end of the second rectifier unit 122 and the second energy storage unit 123, respectively. The second end of the second switch Q2 is connected to the first end of the coil M1 of the relay KM1. The third end of the second switch Q2 is connected to the second end of the first switch Q1. The first end of the first switch Q1 is the first end of the second switch unit 124. The first end of the pair of normally open contacts K1 of the relay KM1 is the second end of the second switch unit 124. The second end of the pair of normally open contacts K1 of the relay KM1 is the third end of the second switch unit 124. The first end of the second switch Q2 is the fourth end of the second switch unit 124. The first end of the coil M1 of the relay KM1 is the fifth end of the second switch unit 124. The second end of the coil M1 of the relay KM1 is the sixth end of the second switch unit 124.

[0041] In this embodiment, taking an example where both the first switch Q1 and the second switch Q2 are NPN transistors, the base of the NPN transistor is the first terminal of the first switch Q1 and the second switch Q2, the collector of the NPN transistor is the second terminal of the first switch Q1 and the second switch Q2, and the emitter of the NPN transistor is the third terminal of the first switch Q1 and the second switch Q2.

[0042] In addition, the first switch Q1 and the second switch Q2 can be any controllable switch, such as an insulated gate bipolar transistor (IGBT) device, an integrated gate commutated thyristor (IGCT) device, a gate turn-off thyristor (GTO) device, a silicon controlled rectifier (SCR) device, a junction gate field-effect transistor (JFET) device, a MOS controlled thyristor (MCT) device, etc.

[0043] In some embodiments, the first load control module 110 and the second load control module 120 both further include a second diode D2, a third diode D3, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a third capacitor C3, and a fourth capacitor C4.

[0044] In the first load control module 110, the anode of the second diode D2 is grounded to GND, and the cathode of the second diode D2 is connected to the second terminal of the first signal selection unit 111 and the first terminal of the first rectifier unit 112. The first terminal of the first resistor R1 is connected to the first terminal of the second resistor R2, the second terminal of the first rectifier unit 112, and the first energy storage unit 113 at the first connection point P1. The second terminal of the first resistor R1 is grounded to GND. The second terminal of the second resistor R2 is connected to the first terminal of the third resistor R3 and the first terminal of the fourth resistor R4. The second terminal of the third resistor R3 is connected to the first terminal of the third capacitor C3 and the first terminal of the first switch unit 114. The second terminal of the fourth resistor R4 is connected to the fourth terminal of the first switch unit 114. The first terminal of the fourth capacitor C4 is connected to the fifth terminal of the first switch unit 114 and the anode of the third diode D3. The second terminal of the fourth capacitor C4 is connected to the sixth terminal of the first switch unit 114 and the cathode of the third diode D3.

[0045] In the second load control module 120, the anode of the second diode D2 is grounded to GND, and the cathode of the second diode D2 is connected to the second terminal of the second signal selection unit 121 and the first terminal of the second rectifier unit 122. The first terminal of the first resistor R1 is connected to the first terminal of the second resistor R2, the second terminal of the second rectifier unit 122, and the second energy storage unit 123 at the first connection point P1. The second terminal of the first resistor R1 is grounded to GND. The second terminal of the second resistor R2 is connected to the first terminal of the third resistor R3 and the first terminal of the fourth resistor R4. The second terminal of the third resistor R3 is connected to the first terminal of the third capacitor C3 and the first terminal of the second switch unit 124. The second terminal of the fourth resistor R4 is connected to the fourth terminal of the second switch unit 124. The first terminal of the fourth capacitor C4 is connected to the fifth terminal of the second switch unit 124 and the anode of the third diode D3. The second terminal of the fourth capacitor C4 is connected to the sixth terminal of the second switch unit 124 and the cathode of the third diode D3.

[0046] The following are Figure 3 The working principle of the circuit structure shown will be explained.

[0047] The control unit 130 outputs a first sub-signal and a second sub-signal, both of which are AC signals, such as PWM signals. It is understood that, in the embodiments of this application, the input power supply 2000 is taken as an AC power supply.

[0048] In the first load control module 110, the first sub-signal passes through the first capacitor C1 and is rectified into a first DC signal by the first diode D1. The first DC signal then charges the second capacitor C2 to generate a first driving voltage on the second capacitor C2. The first driving voltage drives the first switch Q1 and the second switch Q2 to conduct. The first power supply V1, the coil M1 of the relay KM1, the first switch Q1, and the second switch Q2 form a circuit. The first power supply V1 supplies power to the coil M1 of the relay KM1, and a pair of normally open contacts K1 of the relay KM1 close. The input power supply 2000 and the first load 200 form a circuit, and the input power supply 2000 supplies power to the first load 200, causing the first load 200 to operate.

[0049] In the second load control module 120, the second sub-signal passes through the first capacitor C1 and is rectified into a first DC signal by the first diode D1. The first DC signal then charges the second capacitor C2, generating a first driving voltage on the second capacitor C2. This first driving voltage turns on the first switch Q1 and the second switch Q2. The first power supply V1, the coil M1 of the relay KM1, the first switch Q1, and the second switch Q2 form a circuit. The first power supply V1 supplies power to the coil M1 of the relay KM1, causing a pair of normally open contacts K1 of the relay KM1 to close. The input power supply 2000 and the second load 300 form a circuit, supplying power to the second load 300, which then operates.

[0050] In summary, this means that the first load 200 and the second load 300 can work simultaneously.

[0051] Please refer to Figure 4 and Figure 5 , Figure 4 and Figure 5 This is another schematic diagram of the electronic device provided in an embodiment of this application. Wherein, Figure 4 The electronic device shown is Figure 1 The electronic device shown is obtained by adding two level conversion modules (i.e., the first level conversion module 140 and the second level conversion module 150) to it. Figure 5 The electronic device shown is Figure 2 The electronic device shown is obtained by adding two level conversion modules (i.e., the first level conversion module 140 and the second level conversion module 150) to it. Figure 4 Zhongyu Figure 1 The same parts are implemented in the same way and produce the same effect. Figure 5 Zhongyu Figure 2 The implementation and effects of the same parts are the same; for details, please refer to the specific implementation details. Figure 1 and Figure 2 The explanation will not be repeated here.

[0052] like Figure 4and Figure 5 As shown, the first level conversion module 140 is connected to the first connection point P1 and the first switch unit 124 in the second load control module 120, respectively. The first level conversion module 140 is used to convert the high level of the first connection point P1 (the first connection point P1 is high when the voltage of the first connection point P1 is the first driving voltage) to a low level and input it to the first switch unit 124 in the second load control module 120. In the second load control module 120, the first switch unit 124 is turned off in response to the low level output by the first level conversion module 140, thereby disconnecting the connection between the input power supply 2000 and the second load 300.

[0053] The second level conversion module 150 is connected to the second connection point P2 and the first switch unit 114 in the first load control module 110. The second level conversion module 150 is used to convert the high level of the second connection point P2 (the second connection point P2 is high when the voltage of the second connection point P2 is the second driving voltage) to a low level and input it to the first switch unit 114 in the first load control module 110. In the first load control module 110, the first switch unit 114 is turned off in response to the low level output by the second level conversion module 150, thereby disconnecting the connection between the input power supply 2000 and the first load 200.

[0054] Specifically, one of the first load control module 110 and the second load control module 120 receives the signal output by the controller 130 first, and the other receives the signal output by the controller 130 later.

[0055] If the first load control module 110 receives the first sub-signal first, and the second load control module 120 receives the second sub-signal later, then the first energy storage unit 113 first generates the first driving voltage. On the one hand, the first driving voltage drives the first switching unit 114 to conduct, and the connection between the input power supply 2000 and the first load 200 is established, and the first load 200 works. On the other hand, the first connection point P1 is initially at a high level, and the first level conversion module 140 converts the high level to a low level and sends it to the second switching unit 124 so that the second switching unit 124 remains off, the connection between the input power supply 2000 and the second load 300 remains off, and the second load 300 does not work.

[0056] If the second load control module 120 receives the second sub-signal first, and the first load control module 110 receives the first sub-signal later, then the second energy storage unit 123 first generates the second driving voltage. On the one hand, the second driving voltage drives the second switching unit 124 to conduct, and the connection between the input power supply 2000 and the second load 300 is established, and the second load 300 works. On the other hand, the second connection point P2 is initially at a high level, and the second level conversion module 150 converts the high level to a low level and sends it to the first switching unit 114 so that the first switching unit 114 remains off, the connection between the input power supply 2000 and the first load 200 remains off, and the first load 200 does not work.

[0057] In summary, this means that only one load is working between the first load 200 and the second load 300.

[0058] Please refer to Figure 6 , Figure 6 An example is shown with Figure 5 The block diagram of the load control circuit shown corresponds to one type of circuit structure. Among them, Figure 6 The circuit structure shown is in Figure 3 The circuit structure shown is obtained by adding two level conversion modules (i.e., the first level conversion module 140 and the second level conversion module 150) to the circuit structure shown. Figure 6 Zhongyu Figure 3 The implementation and effects of the same parts are the same; for details, please refer to the specific implementation details. Figure 3 The explanation will not be repeated here.

[0059] In some embodiments, such as Figure 6 As shown, both the first level conversion module 140 and the second level conversion module 150 include a third switch Q3, a fifth resistor R5, and a sixth resistor R6. The sixth resistor R6 is connected between the first and third terminals of the third switch Q3, and the third terminal of the third switch Q3 is grounded.

[0060] In the first level conversion module 140, the first end of the third switch Q3 is connected to the first connection point P1 through the fifth resistor R5, the second end of the third switch Q3 is connected to the fourth connection point P4, and the second end of the third switch Q3 is connected to the second switch unit 124 through the third resistor R3 and the fourth resistor R4. In the second load control module 120, the connection point between the second end of the second resistor R2, the first end of the third resistor R3, and the first end of the fourth resistor R4 is the fourth connection point P4. In the second level conversion module 150, the first end of the third switch Q3 is connected to the second connection point P2 through the fifth resistor R5, the second end of the third switch Q3 is connected to the third connection point P3, and the second end of the third switch Q3 is connected to the first switch unit 114 through the third resistor R3 and the fourth resistor R4. In the first load control module 110, the connection point between the second end of the second resistor R2, the first end of the third resistor R3, and the first end of the fourth resistor R4 is the third connection point P3.

[0061] In this embodiment, the third switch Q3 is an NPN transistor. The base of the NPN transistor is the first terminal of the third switch Q3, the collector of the NPN transistor is the second terminal of the third switch Q3, and the emitter of the NPN transistor is the third terminal of the third switch Q3.

[0062] In addition, the third switch Q3 can be any controllable switch, such as an insulated gate bipolar transistor (IGBT) device, an integrated gate commutated thyristor (IGCT) device, a gate turn-off thyristor (GTO) device, a silicon controlled rectifier (SCR) device, a junction gate field-effect transistor (JFET) device, a MOS controlled thyristor (MCT) device, etc.

[0063] The following are Figure 6 The working principle of the circuit structure shown will be explained.

[0064] The control unit 130 outputs a first sub-signal and a second sub-signal, wherein both the first sub-signal and the second sub-signal are AC signals, such as PWM signals.

[0065] If the first load control module 110 receives the first sub-signal first, and the second load control module 120 receives the second sub-signal later, then the second capacitor C2 in the first load control module 110 generates a first driving voltage. On one hand, the first driving voltage drives the first switch Q1 and the second switch Q2 in the first switching unit 114 to conduct, energizing the coil M1 of the relay KM1 in the first switching unit 114, closing a pair of normally open contacts K1 of the relay KM1 in the first switching unit 114, establishing a connection between the input power supply 2000 and the first load 200, and the first load 200 begins to operate; on the other hand, the first connection point... When P1 is high, the third switch Q3 in the first level conversion module 140 is turned on, pulling the fourth connection point P4 low, which corresponds to converting the high level to a low level. The low level is input to the first switch Q1 and the second switch Q2 in the second switch unit 124, so that the first switch Q1 and the second switch Q2 in the second switch unit 124 are turned off. The coil M1 of the relay KM1 in the second switch unit 124 is de-energized, and the pair of normally open contacts K1 of the relay KM1 in the second switch unit 124 are turned off. The connection between the input power supply 2000 and the second load 300 remains off, and the second load 300 does not work.

[0066] If the second load control module 120 receives the second sub-signal first, and the first load control module 110 receives the first sub-signal later, then the second capacitor C2 in the first load control module 110 generates a second driving voltage. On one hand, the second driving voltage drives the first switch Q1 and the second switch Q2 in the second switching unit 124 to conduct, energizing the coil M1 of the relay KM1 in the second switching unit 124, closing a pair of normally open contacts K1 of the relay KM1 in the second switching unit 124, establishing a connection between the input power supply 2000 and the second load 300, and the second load 300 begins operation; on the other hand, the second connection point... When P2 is high, the third switch Q3 in the second level conversion module 150 is turned on, pulling the third connection point P3 low, which corresponds to converting the high level to a low level. The low level is input to the first switch Q1 and the second switch Q2 in the first switch unit 114, so that the first switch Q1 and the second switch Q2 in the first switch unit 114 are turned off. The coil M1 of the relay KM1 in the first switch unit 114 is de-energized, and the pair of normally open contacts K1 of the relay KM1 in the first switch unit 114 are turned off. The connection between the input power supply 2000 and the first load 200 remains off, and the first load 200 does not work.

[0067] In summary, this means that only one load is working between the first load 200 and the second load 300.

[0068] It should be noted that, as Figure 3 and Figure 6The hardware structure of the load control circuit 100 shown is only an example, and the load control circuit 100 may have more or fewer components than those shown in the figure, may combine two or more components, or may have different component configurations. The various components shown in the figure may be implemented in hardware, software, or a combination of hardware and software, including one or more signal processing and / or application-specific integrated circuits.

[0069] For example, in some embodiments, the first level conversion module 140 and the second level conversion module 150 include NOT gates. In the first level conversion module 140, the input terminal of the NOT gate is connected to the first connection point P1, the output terminal of the NOT gate is connected to the fourth connection point P4, and the output terminal of the NOT gate is connected to the second switching unit 124 through the third resistor R3 and the fourth resistor R4; in the second level conversion module 150, the input terminal of the NOT gate is connected to the second connection point P2, the output terminal of the NOT gate is connected to the third connection point P3, and the output terminal of the NOT gate is connected to the first switching unit 114 through the third resistor R3 and the fourth resistor R4.

[0070] In related technologies, to meet European and American standards, software is typically used to control the power supply to the loads, enabling two loads to operate simultaneously or at different times. The specific implementation circuit is as follows: Figure 7 As shown. Figure 7 As shown, when both loads 40 need to operate simultaneously, the control unit 10 controls both switching transistors 20 to conduct, and the pair of normally open contacts of the two relays 30 to close, so both loads 40 operate. When the two loads 40 need not to operate simultaneously, the control unit 10 controls one of the two switching transistors 20 to conduct, and the pair of normally open contacts of one of the two relays 30 to close, so one of the loads 40 operates. However, this method is prone to producing the opposite control result due to abnormal signals output by the control unit 10. For example, when the two loads 40 need not to operate simultaneously, an abnormal signal output by the control unit 10 may cause both loads 40 to operate simultaneously. Therefore, this method has poor anti-interference capability.

[0071] In this application, firstly, by setting a first capacitor C1, which is used for DC blocking and AC passing, even if the first and second sub-signals output by the controller 130 are abnormal, for example, if the first and second sub-signals remain at a high level, the first and second sub-signals cannot charge the subsequent second capacitor C2 through the first capacitor C1. Therefore, the normally open contacts K1 of the relay KM1 will not close erroneously. This demonstrates that the load control circuit 100 of this application has strong anti-interference capabilities. Secondly, a first level conversion module 140 and a second level conversion module 150 are provided to achieve simultaneous operation of the first load 200 and the second load 300 through hardware. Compared to the software control method used in related technologies, this provides stronger anti-interference capabilities and higher reliability.

[0072] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

[0073] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Within the framework of this application, the technical features of the above embodiments or different embodiments can also be combined, and the steps can be implemented in any order. Those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A load control circuit, characterized by, include: A controller and two load control modules, or a controller, two load control modules, and two level conversion modules; The load control module includes a signal selection unit, a rectification unit, an energy storage unit, and a switching unit; The controller is connected to the first terminal of the signal selection unit, the second terminal of the signal selection unit is connected to the first terminal of the rectifier unit, the second terminal of the rectifier unit is connected to the first terminals of the energy storage unit and the switching unit respectively, the second terminal of the switching unit is connected to the input power supply, and the third terminal of the switching unit is connected to the load. The controller is used to output control signals; The signal selection unit is used to select the AC signal output from the control signal; The rectifier unit is used to rectify the AC signal and output a DC signal; The energy storage unit is used to store energy based on the DC signal to generate a driving voltage; The switching unit is used to turn on in response to the driving voltage to establish a connection between the input power supply and the load; The two load control modules include a first load control module and a second load control module. In the first load control module, the second end of the rectifier unit is connected to the first end of the energy storage unit and the first end of the switch unit at a first connection point. In the second load control module, the second end of the rectifier unit is connected to the first end of the energy storage unit and the first end of the switch unit at a second connection point. The two level conversion modules include a first level conversion module and a second level conversion module. The first level conversion module is connected to the first connection point and the switching unit in the second load control module, respectively. The first level conversion module is used to convert the high level of the first connection point to a low level and then input it to the switching unit in the second load control module. The second level conversion module is connected to the second connection point and the switching unit in the first load control module respectively. The second level conversion module is used to convert the high level of the second connection point to a low level and then input it to the switching unit in the first load control module. In the first load control module, the switching unit is turned off in response to the low level output by the second level conversion module, thereby disconnecting the connection between the input power supply and the load; In the second load control module, the switching unit is turned off in response to a low level output by the first level conversion module, thereby disconnecting the input power supply from the load.

2. The load control circuit of claim 1, wherein, The signal selection unit includes a first capacitor; The first capacitor is connected between the controller and the first terminal of the rectifier unit.

3. The load control circuit of claim 1, wherein, The rectifier unit includes a first diode; The anode of the first diode is connected to the second terminal of the signal selection unit, and the cathode of the first diode is connected to the first terminal of the energy storage unit and the first terminal of the switching unit, respectively. In the first load control module, the cathode of the first diode is connected to the first terminal of the energy storage unit and the switching unit at the first connection point. In the second load control module, the cathode of the first diode is connected to the first terminal of the energy storage unit and the switching unit at the second connection point.

4. The load control circuit of claim 1, wherein, The energy storage unit includes a second capacitor; The second capacitor is connected between the first terminal of the rectifier unit and ground.

5. The load control circuit according to claim 1, characterized in that, The switching unit includes a first switch and a relay; The first end of the first switch is connected to the second end of the rectifier unit and the energy storage unit respectively. The second end of the first switch is connected to the first end of the coil of the relay. The second end of the coil of the relay is connected to the first power supply. The first end of a pair of normally open contacts of the relay is connected to the live wire of the input power supply. The second end of a pair of normally open contacts of the relay is connected to the first end of the load.

6. The load control circuit of claim 5, wherein, The switching unit further includes a second switch; The first end of the second switch is connected to the second end of the rectifier unit and the energy storage unit, the second end of the second switch is connected to the first end of the coil of the relay, and the third end of the second switch is connected to the second end of the first switch. Wherein, the first end of the first switch is the first end of the switch unit, the first end of a pair of normally open contacts of the relay is the second end of the switch unit, the second end of a pair of normally open contacts of the relay is the third end of the switch unit, the first end of the second switch is the fourth end of the switch unit, the first end of the coil of the relay is the fifth end of the switch unit, and the second end of the coil of the relay is the sixth end of the switch unit.

7. The load control circuit of claim 6, wherein, Both the first switch and the second switch are NPN transistors; The first terminal of the first switch and the first terminal of the second switch are the base of the NPN transistor, the second terminal of the first switch and the second terminal of the second switch are the collector of the NPN transistor, and the third terminal of the first switch and the third terminal of the second switch are the emitter of the NPN transistor.

8. The load control circuit of any of claims 1-7, wherein, The load control module further includes a second diode, a third diode, a first resistor, a second resistor, a third resistor, a fourth resistor, a third capacitor, and a fourth capacitor; The anode of the second diode is grounded, and the cathode of the second diode is connected to the second terminal of the signal selection unit and the first terminal of the rectifier unit, respectively. The first terminal of the first resistor is connected to the first terminal of the second resistor, the second terminal of the rectifier unit, and the energy storage unit at the first connection point, respectively. The second terminal of the first resistor is grounded, and the second terminal of the second resistor is connected to the first terminal of the third resistor and the first terminal of the fourth resistor, respectively. The second terminal of the third resistor is connected to the first terminal of the third capacitor and the first terminal of the switching unit, respectively. The second terminal of the fourth resistor is connected to the fourth terminal of the switching unit, respectively. The first terminal of the fourth capacitor is connected to the fifth terminal of the switching unit and the anode of the third diode, respectively. The second terminal of the fourth capacitor is connected to the sixth terminal of the switching unit and the cathode of the third diode, respectively.

9. The load control circuit according to claim 8, characterized in that, The level conversion module includes a third switch, a fifth resistor, and a sixth resistor; The sixth resistor is connected between the first and third terminals of the third switch, and the third terminal of the third switch is grounded. In the first level conversion module, the first end of the third switch is connected to the first connection point through the fifth resistor, and the second end of the third switch is connected to the fourth connection point. In the second load control module, the connection point between the second end of the second resistor, the first end of the third resistor, and the first end of the fourth resistor is the fourth connection point. In the second level conversion module, the first end of the third switch is connected to the second connection point through the fifth resistor, and the second end of the third switch is connected to the third connection point. In the first load control module, the connection point between the second end of the second resistor, the first end of the third resistor, and the first end of the fourth resistor is the third connection point.

10. An electronic device, characterized in that, Includes a first load, a second load, and a load control circuit as described in any one of claims 1-9; The first load control module in the load control circuit is connected to the first load to control the first load to be powered on or de-powered. The second load control module in the load control circuit is connected to the second load to control whether the second load is powered on or de-powered.

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