Zero standby power consumption non-contact switch circuit and electronic equipment

Abstract

The present invention proposes a non-contact switch circuit and electronic device with zero standby power consumption. The switch circuit includes a wireless charging transmitter, a wireless charging receiver and a controller. The rectifier bridge output end of the wireless charging receiver is connected to a MOS tube Q1 and a MOS tube Q2; the gate of the MOS tube Q2 is connected to the first output end of the controller; the source of the MOS tube Q3 is connected to the positive electrode of the battery, and the drain is used as the circuit output end of the switch circuit to power the controller; the drain of the MOS tube Q4 is connected to the gate of the MOS tube Q3, and the gate is connected to the second output end of the controller; the collector of the triode Q5 is connected to the input end of the controller, and after the controller detects the waveform signal input by Q5, it outputs a low-level signal through the second output end; the capacitor C1: its positive electrode is connected to the drain of the MOS tube Q1, and the negative electrode is grounded; the input end of the controller is configured as a pull-up input, the first output end is configured as an open-drain output, and the second output end is configured as a push-pull output. In the standby state, the switch circuit does not need to be powered, and a true zero standby power consumption is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic circuits, and in particular to a zero-standby power consumption non-contact switch circuit and electronic equipment. Background Art

[0002] Battery-powered electronic devices operate for extended periods in harsh conditions, such as underwater, in salt spray, dust, and high humidity. This makes maintenance difficult and requires long maintenance cycles. In the absence of manual maintenance, mechanical switches may malfunction, preventing them from turning on and off. To ensure reliable on / off functionality, non-contact technologies such as radio, infrared, capacitive sensing, and magnetic induction are commonly used.

[0003] Considering the economic cost and operational complexity of deploying recovery equipment under harsh conditions, low-power control technology is usually used to reduce the standby power consumption of the equipment and extend the service life of electronic equipment. Taking underwater equipment as an example, some of this equipment needs to work continuously underwater for one to two years, so energy saving and non-contact control are particularly important. In the existing technology, the circuit system is generally controlled by a microcontroller to enter sleep mode. Although this can reduce most of the current consumption, due to the use of non-contact switching technology, the signal receiving or sensing circuit will always be in an active state, and current will still flow. The loss cannot be ignored. If it works for a long time, it may cause the battery to run out and fail to start.

[0004] In addition, in environments where maintenance by personnel is inconvenient, such as underwater, the controlled status of electronic equipment is often invisible. During repeated operations, it is not easy to confirm the power on and off status of underwater equipment, and there is a risk of accidental power on and off. Summary of the Invention

[0005] The present invention aims to overcome the shortcomings of the prior art by providing a zero-standby-power-consumption contactless switch circuit and its application in electronic equipment. The switch circuit is highly reliable and particularly suitable for working environments such as underwater where direct human control is inconvenient, achieving true zero-standby-power consumption.

[0006] In order to achieve the above object, the present invention first provides a zero standby power consumption non-contact switch circuit, which adopts the following technical solution:

[0007] A zero-standby power consumption contactless switch circuit includes: a wireless charging transmitter, a wireless charging receiver, and a controller. The wireless charging receiver includes:

[0008] Receiver coil L2: interacts with the transmitter coil L1 of the wireless charging transmitter;

[0009] Battery:

[0010] Rectifier bridge: Its two input terminals are connected to the first terminal and the second terminal of the receiving coil L2 respectively; its negative output terminal is grounded;

[0011] MOS tube Q1: its source is connected to the positive output terminal of the rectifier bridge;

[0012] MOS transistor Q2: Its gate is connected to the positive output terminal of the rectifier bridge via resistor R2 and to the first output terminal of the controller to receive the on / off control signal; its drain is connected to the gate of MOS transistor Q1 and to the positive output terminal of the rectifier bridge via resistor R1; its source is grounded;

[0013] MOS tube Q3: Its source is connected to the positive electrode of the battery, and its drain serves as the circuit output end of the switching circuit, used to power the controller;

[0014] MOS transistor Q4: Its drain is connected to the gate of MOS transistor Q3 and is connected to the positive electrode of the battery through resistor R3. Its source is grounded, and its gate is connected to the second output terminal of the controller to receive the on / off control signal. Its gate is further connected to the drain of MOS transistor Q1.

[0015] Transistor Q5: Its base is connected to the source of MOS tube Q1 via circuit R7, and its base is grounded via resistor R8. Its collector is connected to the input terminal of the controller, and inputs a waveform signal to the controller. After detecting the waveform signal, the controller outputs a low-level signal through the second output terminal. Its emitter is grounded;

[0016] Capacitor C1: its positive electrode is connected to the drain of MOS tube Q1, and its negative electrode is grounded;

[0017] The input terminal of the controller is configured as a pull-up input, the first output terminal is configured as an open-drain output, and the second output terminal is configured as a push-pull output.

[0018] In some embodiments of the present invention, the rectifier bridge includes:

[0019] It includes a diode D1, a diode D2, a diode D3 and a diode D4. The anode of diode D1 is connected to the anode of diode D2, the cathode of diode D1 is connected to the first end of the receiving end coil and the anode of diode D3, and the cathode of diode D2 is connected to the second end of the receiving end coil L2 and the anode of diode D4. The anode of diode D1 and the anode of diode D4 are further grounded, and the cathode of diode D3 and the cathode of diode D4 are further connected to the source of MOS transistor Q1.

[0020] In some embodiments of the present invention, a diode D5 is further included, which is arranged between the controller and the MOS transistor Q4: its anode is connected to the second output terminal of the controller to receive the conduction control signal, and its cathode is connected to the gate of the MOS transistor Q4.

[0021] In some embodiments of the present invention, a diode D6 is further included, which is disposed between the drain of the MOS transistor Q1 and the MOS transistor Q4 : its anode is connected to the drain of the MOS transistor Q1 , and its cathode is connected to the gate of the MOS transistor Q4 .

[0022] In some embodiments of the present invention, a diode D7 is further included, with an anode connected to the drain of the MOS transistor Q1 and a cathode connected to the positive electrode of the battery.

[0023] In some embodiments of the present invention, a capacitor C2 is further included: its positive electrode is connected to the anode of the diode D5, and its negative electrode is grounded.

[0024] In some embodiments of the present invention, a capacitor C3 is further included: its positive electrode is connected to the anode of the diode D6, and its negative electrode is grounded.

[0025] In some embodiments of the present invention, a capacitor C4 is further included: a positive electrode of the capacitor C4 is connected to the drain of the MOS transistor Q3, and a negative electrode of the capacitor C4 is grounded.

[0026] In some embodiments of the present invention, the drain of the MOS transistor Q3 is connected to a controller via a voltage stabilizing circuit.

[0027] Some embodiments of the present invention further provide an electronic device, which adopts the above-mentioned zero standby power consumption non-contact switch circuit.

[0028] Compared with the prior art, the advantages and positive effects of the present invention are:

[0029] The circuit features a simple structure, small size, low cost, and ease of integration. It also boasts high reliability and strong environmental adaptability, helping to improve the sealing level of electronic equipment in environments such as underwater and salt spray, and possesses excellent application value. The entire power-on / off circuit requires no power supply in standby mode, achieving true zero standby power consumption and significantly extending the lifespan of electronic devices. The switching circuit utilizes a contactless switching method, triggered by an external wireless charger, to achieve power-on / off functionality, avoiding issues such as aging and failure of mechanical switches. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the switch circuit structure of the first embodiment of the present invention;

[0031] Figure 2 This is a schematic diagram of the switch circuit structure of the second embodiment of the present invention;

[0032] Figure 3 This is a schematic diagram of the input and output structure of the controller of the present invention. DETAILED DESCRIPTION

[0033] The present invention is described in detail below by way of exemplary embodiments, but it should be understood that elements, structures, and features of one embodiment may be beneficially combined in other embodiments without further description.

[0034] The first embodiment of the present invention provides a contactless switching circuit with zero standby power consumption. The circuit can be installed in electronic devices, particularly those operating in harsh conditions such as underwater. This circuit can be used for contactless control of electronic devices. When the device is not operating, the circuit is in standby mode, consuming zero power.

[0035] First reference Figure 1 The zero-standby power, contactless switching circuit includes a wireless charging transmitter, a wireless charging receiver, and a controller. The wireless charging transmitter includes a transmitter coil L1, and the wireless charging receiver includes a receiver coil L2. Electromagnetic interaction between the two coils generates induced electrical energy. The operating principles of the wireless charging transmitter and receiver are well-known and will not be further described.

[0036] The controller also includes two output terminals (CTRL1 and CTRL2) and one input terminal (INPUT). The INPUT terminal is configured as a pull-up input, the CTRL1 terminal is configured as an open-drain output, and the CTRL2 terminal is configured as a push-pull output.

[0037] The switch circuit also includes the following functional units.

[0038] Battery: As an energy storage device, it can power electronic devices when the switch circuit is on. It can be a rechargeable battery or a disposable battery.

[0039] The rectifier bridge has two input terminals connected to the first and second terminals of the receiving coil L2, respectively; its negative output terminal is grounded. The rectifier bridge is used to convert the AC power output by the wireless charging coil L2 into DC power.

[0040] In some specific embodiments of the present invention, the specific structure of the rectifier bridge is as follows.

[0041] It includes a diode D1, a diode D2, a diode D3 and a diode D4. The anode of diode D1 is connected to the anode of diode D2, the cathode of diode D1 is connected to the first end of the receiving end coil and the anode of diode D3, and the cathode of diode D2 is connected to the second end of the receiving end coil L2 and the anode of diode D4. The anode of diode D1 and the anode of diode D4 are further grounded, and the cathode of diode D3 and the cathode of diode D4 serve as the positive output end of the rectifier bridge.

[0042] MOS tube Q1: Its source is connected to the positive output end of the rectifier bridge, that is, the cathode connection end of the diode D3 and the cathode connection end of the diode D4.

[0043] MOS transistor Q2: Its gate is connected to the positive output of the rectifier bridge and to the first output terminal (CTRL1) of the controller, receiving the on / off control signal. Its drain is connected to the gate of MOS transistor Q1, and its source is grounded. Resistor R1 can be placed between the source of MOS transistor Q1 and the drain of MOS transistor Q2, and resistor R2 can be placed between the gate of MOS transistor Q2 and the positive output of the rectifier bridge. The rectifier bridge output is pulled high by resistor R2 and transmitted to MOS transistor Q2, controlling its conduction.

[0044] MOS tube Q3: Its source is connected to the positive electrode of the battery, and its drain serves as the circuit output end of the switching circuit, used to power the controller.

[0045] MOS transistor Q4: Its drain is connected to the gate of MOS transistor Q3 and to the positive electrode of the battery. Its source is grounded. Its gate is connected to the second output terminal of the controller to receive the on / off control signal. Its gate is further connected to the drain of MOS transistor Q1. Resistor R3 can be provided between the gate of MOS transistor Q4 and the positive electrode of the battery.

[0046] Transistor Q5: Its base is connected to the source of the MOS transistor Q1 and to ground, and its collector is connected to the input terminal (INPUT) of the controller to input a waveform signal to the controller. After detecting the waveform signal, the controller outputs a low-level signal through the second output terminal. Its emitter is grounded. Resistor R7 can be set between its base and the source of the MOS transistor Q1, and resistor R8 can be set between its base and ground.

[0047] Capacitor C1: Its positive electrode is connected to the drain of MOS tube Q1, and its negative electrode is grounded; it plays the role of stabilizing voltage;

[0048] The input terminal (INPUT) of the controller is configured as a pull-up input, the first output terminal (CTRL1) is configured as an open-drain output, and the second output terminal (CTRL2) is configured as a push-pull output.

[0049] Some embodiments of the present invention further include a diode D5 disposed between the controller and the MOS transistor Q4. Its anode is connected to the controller's second output terminal (CTRL2) and receives the conduction control signal, and its cathode is connected to the gate of the MOS transistor Q4. A resistor R5 may be disposed between the controller's second output terminal and the anode of the diode D5.

[0050] In some embodiments of the present invention, a diode D6 is further provided between the drain of MOS transistor Q1 and MOS transistor Q4. The diode D6 has an anode connected to the drain of MOS transistor Q1 and a cathode connected to the gate of MOS transistor Q4. A resistor R6 may be further provided between the drain of MOS transistor Q1 and the anode of diode D6.

[0051] refer to Figure 2 Considering that the battery can be a rechargeable battery, some embodiments of the present invention further include a diode D7 to enable battery charging. Its anode is connected to the drain of MOS transistor Q1, and its cathode is connected to the positive terminal of the battery. When the wireless charging transmitter unit is activated, the current output from the drain of MOS transistor Q1 can both turn on MOS transistors Q3 and Q4 to enable the power-on function and charge battery BAT to improve battery life.

[0052] Some embodiments of the present invention further include a capacitor C2, with its positive electrode connected to the anode of diode D5 and its negative electrode connected to the source and gate of MOS transistor Q4. This capacitor C2 provides voltage stabilization and filtering. A resistor R4 may be provided between C2 and the gate of MOS transistor Q4.

[0053] In some embodiments of the present invention, a capacitor C3 is further included, with its positive electrode connected to the anode of the diode D6 and its negative electrode grounded, to play a filtering role.

[0054] In some embodiments of the present invention, a capacitor C4 is further included: a positive electrode of the capacitor C4 is connected to the drain of the MOS transistor Q3, and a negative electrode of the capacitor C4 is grounded.

[0055] refer to Figure 3 In some embodiments of the present invention, the drain of the MOS tube Q3 is connected to the controller via a voltage stabilizing circuit for voltage stabilization of the controller power supply.

[0056] A second embodiment of the present invention provides an electronic device, which includes the zero-standby power consumption non-contact switch circuit provided by the first embodiment.

[0057] The working process of the zero standby power consumption non-contact switch circuit provided by the present invention is as follows.

[0058] In the initial state, the controller is not powered on, the output terminals CTRL1 and CTRL2 and the input terminal INPUT are all in high-impedance state, the MOS terminals Q1, Q2, Q3, and Q4 are all in the cut-off state, and VOUT has no voltage output.

[0059] After the wireless charging transmitter is started, it transmits a wireless charging signal without specific modulation, causing interaction between the wireless transmitting coil L1 and the receiving coil L2 of the wireless receiving end. AC voltage is generated across the receiving coil L2 and converted into DC power through a rectifier bridge.

[0060] The positive output of the rectifier bridge is connected to MOS transistors Q1 and Q2, respectively. Resistor R2 raises the gate voltage of MOS transistor Q2, turning it on. This lowers the gate voltage of MOS transistor Q1, turning it on. After MOS transistor Q1 turns on, current flows through resistor R6 and diode D6, raising the gate voltage of MOS transistor Q4. Capacitors C1 and C3 stabilize the voltage and provide filtering. MOS transistor Q4 turns on, lowering the gate voltage of MOS transistor Q3, turning it on. At this point, the battery circuit is conducting, and a high voltage level is output through the drain of MOS transistor Q3. The battery voltage (BAT) flows through MOS transistor Q3 to the voltage output terminal (VOUT). The voltage regulator circuit then powers the microcontroller, which then starts operating.

[0061] After voltage division by resistors R7 and R8, the base voltage of transistor Q5 is raised, turning on transistor Q5 and bringing the microcontroller's INPUT input to a low level. The microcontroller then controls CTRL2 to output a high level. If the wireless charging transmitter is turned off at this time, MOS transistors Q4 and Q3 remain on, maintaining the voltage output at output VOUT. As the charge stored in capacitors C1 and C3 gradually discharges, the base voltage of transistor Q5 decreases, turning off transistor Q5. The pull-up function of INPUT causes the output to be high. The microcontroller then configures output CTRL1 as an open-drain output and controls its output to be low, preparing for shutdown detection.

[0062] When the wireless charging transmitter unit is restarted, MOS transistors Q2 and Q1 are unable to conduct because the microcontroller's CTRL1 is at a low level, preventing current from flowing through MOS transistor Q1. However, transistor Q5 is on, and the INPUT input is at a low level. When the wireless charging transmitter unit is turned off, the INPUT input becomes high. By adjusting the time interval between the wireless charging transmitter's startup and shutdown, the INPUT generates a waveform with a specific pulse width. When the microcontroller detects this waveform, it controls CTRL2 to output a low level, releasing the charge from capacitor C2 until MOS transistor Q4 and Q3 are turned off, and VOUT stops outputting voltage. When the voltage of capacitor C4 drops to the point where the voltage regulator circuit stops outputting, the microcontroller shuts down, and CTRL1, CTRL2, and INPUT return to a high-impedance state.

[0063] When the electronic device is powered on, transmitting a wireless charging signal without specific modulation multiple times will not change its power-on state. Therefore, if you are unsure whether the electronic device is powered on or off, you can first transmit a wireless charging signal without specific modulation to turn it on before proceeding to the next step.

[0064] In the off state, the circuit is in standby mode and does not require power supply, achieving zero standby power consumption.

[0065] The above description is merely a preferred embodiment of the present invention and does not constitute any other form of limitation to the present invention. Any person skilled in the art may utilize the technical contents disclosed above to change or modify them into equivalent embodiments with equivalent changes for application in other fields. However, any simple modification, equivalent change, and modification of the above embodiments made in accordance with the technical essence of the present invention without departing from the technical solution of the present invention shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. Zero standby power consumption non-contact switch circuit, characterized in that, include: A wireless charging transmitter, a wireless charging receiver and a controller, wherein the wireless charging receiver comprises: Receiving coil L2: interacts with the transmitting coil L1 of the wireless charging transmitting end; Battery: Rectifier bridge: its two input ends are respectively connected to the first end and the second end of the receiving end coil L2; its negative output end is grounded; MOS tube Q1: its source is connected to the positive output terminal of the rectifier bridge; MOS tube Q2: Its gate is connected to the positive output end of the rectifier bridge through the resistor R2, and is connected to the first output end of the controller to receive the on / off control signal; its drain is connected to the gate of the MOS tube Q1, and is connected to the positive output end of the rectifier bridge through the resistor R1; its source is grounded; MOS tube Q3: Its source is connected to the positive electrode of the battery, and its drain serves as the circuit output end of the switch circuit, which is used to power the controller; MOS transistor Q4: its drain is connected to the gate of MOS transistor Q3 and connected to the positive electrode of the battery via resistor R3, its source is grounded, its gate is connected to the second output terminal of the controller, receives the on / off control signal, and its gate is further connected to the drain of MOS transistor Q1; Transistor Q5: Its base is connected to the source of MOS tube Q1 through circuit R7, its base is connected to ground through resistor R8, its collector is connected to the input end of the controller, and the controller inputs a waveform signal. After detecting the waveform signal, the controller outputs a low-level signal through the second output end, and its emitter is grounded; Capacitor C1: Its positive electrode is connected to the drain of MOS tube Q1, and its negative electrode is grounded; The input terminal of the controller is configured as a pull-up input, the first output terminal is configured as an open-drain output, and the second output terminal is configured as a push-pull output.

2. The zero standby power consumption non-contact switch circuit according to claim 1, characterized in that: The rectifier bridge comprises: It includes a diode D1, a diode D2, a diode D3 and a diode D4, wherein the anode of the diode D1 is connected to the anode of the diode D2, the cathode of the diode D1 is connected to the first end of the receiving end coil and the anode of the diode D3, and the cathode of the diode D2 is connected to the second end of the receiving end coil L2 and the anode of the diode D4; the anode of the diode D1 and the anode of the diode D2 are further grounded, and the cathode of the diode D3 and the cathode of the diode D4 are further connected to the source of the MOS tube Q1.

3. The zero standby power consumption non-contact switch circuit according to claim 1, characterized in that: It further includes a diode D5, which is arranged between the controller and the MOS tube Q4: its anode is connected to the second output terminal of the controller to receive the conduction control signal, and its cathode is connected to the gate of the MOS tube Q4.

4. The zero standby power consumption non-contact switch circuit according to claim 1, characterized in that: The device further comprises a diode D6 which is arranged between the drain of the MOS transistor Q1 and the MOS transistor Q4 : its anode is connected to the drain of the MOS transistor Q1 , and its cathode is connected to the gate of the MOS transistor Q4 .

5. The zero standby power consumption non-contact switch circuit according to claim 1, characterized in that: It further comprises a diode D7, an anode of which is connected to the drain of the MOS tube Q1, and a cathode of which is connected to the positive electrode of the battery.

6. The zero standby power consumption non-contact switch circuit according to claim 3, characterized in that: A capacitor C2 is further included: its anode is connected to the anode of the diode D5, and its cathode is grounded.

7. The zero standby power consumption non-contact switch circuit according to claim 4, characterized in that: The device further comprises a capacitor C3 : a positive electrode of the capacitor C3 is connected to the anode of the diode D6 , and a negative electrode of the capacitor C3 is grounded.

8. The zero standby power consumption non-contact switch circuit according to claim 1, characterized in that: It further includes a capacitor C4: a positive electrode of which is connected to the drain of the MOS tube Q3, and a negative electrode of which is grounded.

9. The zero standby power consumption non-contact switch circuit according to claim 1 or 7, characterized in that: The drain of the MOS tube Q3 is connected to the controller via a voltage stabilizing circuit.

10. An electronic device, characterized in that: The invention comprises the zero standby power consumption non-contact switch circuit as claimed in any one of claims 1 to 9.

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