Intelligent single-live-wire switch circuit

Abstract

The utility model discloses an intelligent single-fire switch circuit, which is characterized in that an auxiliary power supply circuit is additionally arranged in the intelligent single-fire switch circuit, so that the current passing through a load is reduced when an intelligent switch is in an off state, and if the load is a lamp, the condition that the lamp flickers after being turned off can be effectively avoided in the mode. Moreover, the auxiliary power supply circuit can store electric energy when the intelligent switch is in a closed state, and transmit the electric energy to the power supply circuit when the intelligent switch is in an open state, so that the power supply circuit provides more electric energy for components (such as an MCU and the like) needing to maintain current.

Description

Technical Field

[0001] The utility model belongs to the technical field of smart home, and in particular relates to an intelligent single-fire switch circuit. Background Art

[0002] A smart single-fire switch is a smart home device typically used to turn lights or appliances on and off. It offers remote control, timer control, and voice control, and can be operated via smartphone apps or smart voice assistants. It typically connects to a home wireless network and connects to a smart home system via Bluetooth or other communication protocols, allowing users to remotely control and monitor connected appliances, enhancing the intelligence of their homes and improving convenience and comfort.

[0003] However, when the smart single-fire switch is in the off state, its own circuit still requires a certain holding current to maintain standby mode, and the energy-saving lamp or LED lamp is connected in series with the switch. If the holding current is greater than 40uA when passing through the lamp circuit, a voltage will be generated on the ballast inductor, causing the lamp to flicker.

[0004] To avoid this situation, the holding current must be strictly controlled so that it is not too large. However, insufficient holding current can easily limit some functions of the smart single-fire switch, or even cause the module in the smart single-fire switch to lose connection with the network, making it impossible to intelligently control the smart single-fire switch. Utility Model Content

[0005] The present invention provides an intelligent single-fire switch circuit to solve the problems in the prior art of intelligent single-fire switches that easily flicker when in the off state, and that some functions are limited or even the network connection is lost due to insufficient maintenance current.

[0006] In order to solve the above technical problems, the present invention discloses the following technical solutions:

[0007] One aspect of the present invention provides an intelligent single-fire switch circuit, comprising a load and a power supply circuit connected in series, a main power supply that provides electrical energy to the power supply circuit, and an intelligent switch arranged between the power supply circuit and the main power supply, further comprising a micro control unit MCU and an auxiliary power supply circuit, wherein:

[0008] One input terminal of the MCU is connected to the output terminal of the power supply circuit, so that the MCU obtains electric energy from the power supply circuit; another input terminal of the MCU is connected to the output terminal of the intelligent switch, and the output terminal is connected to the control terminal of the auxiliary power supply circuit, and is configured to control the auxiliary power supply circuit to store or release electric energy according to the state of the intelligent switch;

[0009] The auxiliary power supply circuit is arranged between the power supply circuit and the intelligent switch, and includes an energy storage and discharge circuit and a battery charging circuit, wherein:

[0010] The output end of the energy storage circuit is connected to the input end of the power supply circuit, and the input end is connected to the output end of the battery charging circuit. The energy storage circuit is configured to deliver stored electrical energy to the power supply circuit when the intelligent switch is in an open state, and to receive and store electrical energy through the battery charging circuit when the intelligent switch is in a closed state.

[0011] The battery charging circuit is connected to the main power supply via an intelligent switch, and is configured to transmit the electric energy of the main power supply to the lithium battery energy storage and discharge circuit when the intelligent switch is in a closed state.

[0012] Optionally, the energy storage and discharge circuit includes a lithium battery energy storage and discharge circuit, which includes a lithium battery and a battery protection circuit; the battery protection circuit is arranged between the lithium battery and the power supply circuit, and includes a lithium battery protection module and a DCDC converter, the lithium battery protection module is configured to protect the lithium battery, and the DCDC converter is configured to adjust the voltage delivered to the power supply circuit.

[0013] Optionally, the lithium battery protection module is connected to the MCU, and includes a protection integrated circuit, an overvoltage protection circuit, an undervoltage protection circuit, an overcurrent protection circuit and an overtemperature protection circuit. The lithium battery protection module is configured to control the corresponding protection circuit to perform protection operations on the lithium battery when the voltage value, current value or temperature value of the lithium battery exceeds the corresponding preset range, and to send a battery fault signal to the MCU through the protection integrated circuit.

[0014] Optionally, the battery charging circuit includes a DCDC converter and a filter, wherein the DCDC converter is connected to the lithium battery energy storage and discharge circuit and is configured to adjust the voltage delivered to the lithium battery energy storage and discharge circuit; the filter is connected to the DCDC converter and is configured to smooth the output voltage and current of the DCDC converter.

[0015] Optionally, the battery charging circuit further includes a rectifier, the input end of the rectifier is connected to the main power supply, the output end is connected to the DCDC converter, and is configured to convert alternating current into direct current; the rectifier includes a diode bridge consisting of four diodes.

[0016] Optionally, the battery charging circuit further includes a current control device arranged between the rectifier and the DCDC converter, configured to adjust the current according to the state of the lithium battery; the current control device includes a current sensor and a control transistor; the current sensor is connected to the MCU, configured to monitor the current flowing out of the rectifier, and transmit the current value to the MCU, so that the MCU generates a current control signal based on the current value and sends it to the control transistor; the control transistor is configured to adjust the current according to the received current control signal.

[0017] Optionally, the lithium battery protection module further includes a voltage monitoring circuit connected to the lithium battery and the protection integrated circuit, and is configured to monitor the voltage value of the lithium battery and send it to the protection integrated circuit.

[0018] Optionally, the lithium battery protection module also includes a current monitoring circuit connected to the lithium battery and the protection integrated circuit, and the current monitoring circuit is provided with a shunt resistor connected in series with the lithium battery; the current monitoring circuit is configured to use the shunt resistor to monitor the current value of the lithium battery and send it to the protection integrated circuit.

[0019] Optionally, the lithium battery protection module further includes a temperature sensor connected to the lithium battery and the protection integrated circuit, and is configured to monitor the temperature value of the lithium battery and send it to the protection integrated circuit.

[0020] Optionally, the protection integrated circuit is respectively connected to the overvoltage protection circuit, undervoltage protection circuit, overcurrent protection circuit and over-temperature protection circuit, and is configured to send control signals to the overvoltage protection circuit, undervoltage protection circuit, overcurrent protection circuit and / or over-temperature protection circuit according to the voltage value, current value and temperature value of the lithium battery, and to receive feedback signals sent by the overvoltage protection circuit, undervoltage protection circuit, overcurrent protection circuit and over-temperature protection circuit.

[0021] An embodiment of the present utility model discloses an intelligent single-fire switch circuit. By adding an auxiliary power supply circuit to the intelligent single-fire switch circuit, the current passing through the load is reduced when the intelligent switch is in the off state. If the load is a lamp, this method can effectively prevent the lamp from flickering after being turned off.

[0022] Moreover, the auxiliary power supply circuit can store electrical energy when the smart switch is in the closed state.

[0023] Furthermore, when the intelligent switch is in the off state, electric energy is delivered to the power supply circuit, so that the power supply circuit provides more electric energy to components (such as MCU, etc.) that need to maintain current. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic structural diagram of an intelligent single fire switch circuit provided by an embodiment of the present utility model;

[0025] Figure 2 This is a structural diagram of another intelligent single fire switch circuit provided in an embodiment of the present utility model. DETAILED DESCRIPTION

[0026] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0027] Figure 1 This is a schematic diagram of the structure of an intelligent single-fire switch circuit provided by an embodiment of the present utility model, comprising a load 1 and a power supply circuit 2 connected in series, a main power supply 3 that provides power to the power supply circuit 2, and an intelligent switch 4 disposed between the power supply circuit 2 and the main power supply 3. The intelligent switch 4 can conduct the main power supply 3 and the power supply circuit 2, so that the power supply circuit 2 can provide power to the load 1. Figure 1 As shown, the intelligent single fire switch circuit disclosed in the present invention further includes a micro control unit MCU5 and an auxiliary power supply circuit 6. Each component will be introduced in detail below.

[0028] 1. Micro Control Unit MCU

[0029] One input terminal of the MCU 5 is connected to the output terminal of the power supply circuit 2, and it obtains power from the power supply circuit 2. Another input terminal of the MCU 5 is connected to the output terminal of the smart switch 4, and the output terminal of the MCU 5 is connected to the control terminal of the auxiliary power supply circuit 6. The MCU 5 is configured to control the auxiliary power supply circuit 6 to store power when the smart switch 4 is closed, and to discharge power to the auxiliary power supply circuit 6 when the smart switch 4 is open.

[0030] In one embodiment disclosed in the present invention, the MCU5 comprises at least a central processing unit (CPU), a memory, an input / output interface (I / O), a communication interface, and a signal transceiver module.

[0031] The central processing unit (CPU) is the brain of the MCU5, responsible for executing program instructions and handling logic and computing tasks.

[0032] Memory can include random access memory (RAM), and read-only memory (ROM) or flash memory. RAM is used to store temporary data and variables during program execution; ROM or flash memory is used to store firmware and program code, which is usually written only once or can be reprogrammed multiple times during the life of the device.

[0033] The input / output interface (I / O) includes a GPIO (general purpose input / output) port for connecting external devices such as buttons, touch panels, and LED indicators. In the disclosed embodiment of the present invention, one input pin of the MCU 5 is connected to the output terminal of the smart switch 4, and one output pin is connected to the control terminal of the auxiliary power supply circuit 6.

[0034] The communication interface may include UART, I2C or SPI for communication between MCU5 and other devices or modules, and may also include wireless communication modules such as Wi-Fi, Bluetooth, ZigBee, etc., for integration with smart home systems.

[0035] The signal transceiver module is connected to the CPU and is configured to send a charging signal to the auxiliary power supply circuit 6 when the smart switch 4 is in a closed state, and to send a discharging signal to the auxiliary power supply circuit 6 when the smart switch 4 is in an open state.

[0036] When the smart switch 4 is in a closed state, it sends a smart switch 4 closing signal to the signal transceiver module, and the signal transceiver module sends the signal to the CPU. The CPU generates a signal to charge the auxiliary power supply circuit 6 and sends it to the signal transceiver module. The signal transceiver module sends the charging signal to the control end of the auxiliary power supply circuit 6 to enable the auxiliary power supply circuit 6 to start storing electrical energy.

[0037] When the intelligent switch 4 is in the off state, it sends an off signal to the signal transceiver module. The signal transceiver module sends the signal to the CPU. The CPU generates a signal to discharge the auxiliary power supply circuit 6 and sends it to the signal transceiver module. The signal transceiver module sends the discharge signal to the control end of the auxiliary power supply circuit 6 to enable the auxiliary power supply circuit 6 to start discharging electrical energy.

[0038] 2. Auxiliary power supply circuit

[0039] The auxiliary power supply circuit 6 is provided between the power supply circuit 2 and the intelligent switch 4, and includes an energy storage circuit 62 and a battery charging circuit 61, wherein:

[0040] The output of the energy storage circuit 62 is connected to the input of the power supply circuit 2, and the input of the energy storage circuit 62 is connected to the output of the battery charging circuit 61. The energy storage circuit 62 is configured to deliver stored electrical energy to the power supply circuit 2 when the smart switch 4 is in the open state, and to receive and store electrical energy through the battery charging circuit 61 when the smart switch 4 is in the closed state.

[0041] The energy storage and discharge circuit 62 includes a lithium battery energy storage and discharge circuit. Figure 2As shown, the lithium battery energy storage and discharge circuit includes a lithium battery 21 and a battery protection circuit 22. The lithium battery 21 is capable of storing and releasing electrical energy. The battery protection circuit 22 is disposed between the lithium battery 21 and the power supply circuit 2 and includes a lithium battery protection module 23 and a DC-DC converter 24. The lithium battery protection module 23 is configured to protect the lithium battery 21, ensuring safe and stable operation. The DC-DC converter 24 is configured to adjust the voltage supplied from the lithium battery 21 to the power supply circuit 2.

[0042] The lithium battery protection module 23 is connected to the MCU5 and includes a protection integrated circuit, an overvoltage protection circuit, an undervoltage protection circuit, an overcurrent protection circuit, and an overtemperature protection circuit. When the voltage, current, or temperature of the lithium battery 21 exceeds a corresponding preset range, the lithium battery protection module 23 controls the corresponding protection circuit to perform a protective operation on the lithium battery 21. Furthermore, the protection integrated circuit transmits a battery fault signal to the MCU5, causing the MCU5 to react accordingly to the battery fault signal to protect the lithium battery 21.

[0043] The protection integrated circuit is the core component of the lithium battery protection module 23 and consists of a dedicated integrated circuit. It is responsible for monitoring the battery voltage, current, and temperature, and taking measures to protect the battery when abnormal conditions are detected.

[0044] The overvoltage protection circuit is used to operate when the voltage value of the lithium battery 21 exceeds the upper limit of the preset voltage range to protect the lithium battery 21; the undervoltage protection circuit is used to operate when the voltage value of the lithium battery 21 is lower than the lower limit of the preset voltage range; the overcurrent protection circuit is used to operate when the current value of the lithium battery 21 exceeds the upper limit of the preset current range; the overtemperature protection circuit is used to operate when the temperature of the lithium battery 21 exceeds the upper limit of the preset temperature range.

[0045] The protection integrated circuit monitors the voltage, current, and temperature of the lithium battery 21 in real time. When the voltage, current, or temperature falls outside the corresponding preset range, it controls the corresponding protection circuit to start operating, thereby protecting the lithium battery 21. Simultaneously, the protection integrated circuit sends a battery fault signal to the MCU5, which reacts accordingly to protect the lithium battery 21. For example, when an overcurrent condition occurs in the lithium battery 21, the protection integrated circuit sends an overcurrent fault signal to the MCU5, which then shuts down the circuit based on the signal to prevent the lithium battery 21 from malfunctioning, thereby protecting the battery's safety.

[0046] In one embodiment disclosed in the present invention, the lithium battery protection module 23 further includes a voltage monitoring circuit connected to the lithium battery 21 and the protection integrated circuit, and is configured to monitor the voltage value of the lithium battery 21 and send it to the protection integrated circuit.

[0047] When an abnormal voltage condition occurs, the protection integrated circuit controls the overvoltage protection circuit or the undervoltage protection circuit to protect the battery.

[0048] In one embodiment disclosed herein, the lithium battery protection module 23 further includes a current monitoring circuit connected to the lithium battery 21 and the protection integrated circuit. The current monitoring circuit includes a shunt resistor connected in series with the lithium battery 21. The current monitoring circuit is configured to monitor the current value of the lithium battery 21 using the shunt resistor and transmit the current value to the protection integrated circuit. This allows the protection integrated circuit to control the overcurrent protection circuit to protect the lithium battery 21 when an abnormal current condition occurs.

[0049] In one embodiment disclosed in the present invention, the lithium battery protection module 23 also includes a temperature sensor connected to the lithium battery 21 and the protection integrated circuit, which is configured to monitor the temperature value of the lithium battery 21 and send it to the protection integrated circuit, so that the protection integrated circuit controls the over-temperature protection circuit to perform protection operations on the lithium battery 21 when the battery temperature is abnormal.

[0050] In one embodiment disclosed in the present invention, the protection integrated circuit is connected to the overvoltage protection circuit, the undervoltage protection circuit, the overcurrent protection circuit and the overtemperature protection circuit, respectively, and is configured to send control signals to the overvoltage protection circuit, the undervoltage protection circuit, the overcurrent protection circuit and / or the overtemperature protection circuit, and to receive feedback signals sent by the overvoltage protection circuit, the undervoltage protection circuit, the overcurrent protection circuit and the overtemperature protection circuit.

[0051] The DCDC converter 24 is used to convert electrical energy into the voltage, current, or frequency required by the power supply circuit 2. For example, the DCDC converter 24 can step up or down the input voltage to a level suitable for the power supply circuit 2. It can also ensure that the output current meets the requirements of the power supply circuit 2, ensuring that the power supply circuit 2 receives the required power and providing a stable power supply under various operating conditions.

[0052] The battery charging circuit 61 is connected to the main power source 3 via the intelligent switch 4 and is configured to transmit the electric energy of the main power source 3 to the lithium battery energy storage and discharge circuit when the intelligent switch 4 is in a closed state.

[0053] like Figure 2 As shown, the battery charging circuit 61 includes a DCDC converter 11 and a filter 12, wherein the DCDC converter 11 is different from the DCDC converter 24 in the aforementioned embodiment. The DCDC converter 11 is connected to the lithium battery energy storage and discharge circuit and is configured to adjust the voltage transmitted to the lithium battery energy storage and discharge circuit; the filter 12 is connected to the DCDC converter 11 and is configured to smooth the output voltage and current of the DCDC converter 11.

[0054] Since lithium batteries require direct current for charging, in one embodiment disclosed herein, the battery charging circuit 61 further includes a rectifier. The input end of the rectifier is connected to the main power supply 3, and the output end is connected to the DC-DC converter 11. The main function of the rectifier is to convert alternating current (AC) into direct current (DC), and the rectifier includes a diode bridge composed of four diodes. The diodes allow current to flow in only one direction, thereby converting the bidirectional flow of alternating current into a unidirectional flow. In each AC cycle, the diode bridge allows the positive portion of each half-wave to pass while blocking the negative portion, thereby generating a pulsed DC output.

[0055] In one embodiment disclosed herein, the battery charging circuit 61 further includes a current control device disposed between the rectifier and the DC-DC converter 11, configured to adjust the current according to the state of the lithium battery 21. The current control device ensures that the lithium battery 21 is charged with a safe current to prevent damage to the battery due to overcharging current.

[0056] The current control device includes a current sensor and a control transistor; the current sensor is connected to MCU5 and is configured to monitor the current flowing out of the rectifier and transmit the current value to MCU5 so that MCU5 generates a current control signal based on the current value; the control transistor is configured to adjust the current according to the received current control signal.

[0057] It is understood that the above embodiments are merely exemplary embodiments for illustrating the principles of the present invention, and the present invention is not limited thereto. Those skilled in the art may make various modifications and improvements without departing from the spirit and substance of the present invention, and such modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. An intelligent single-fire switch circuit, comprising a load and a power supply circuit connected in series, a main power supply for providing electric energy to the power supply circuit, and an intelligent switch arranged between the power supply circuit and the main power supply, characterized in that: It also includes a micro control unit MCU and an auxiliary power supply circuit, wherein: One input end of the MCU is connected to the output end of the power supply circuit, so that the MCU obtains electric energy from the power supply circuit; another input end of the MCU is connected to the output end of the intelligent switch, and the output end is connected to the control end of the auxiliary power supply circuit, and is configured to control the auxiliary power supply circuit to store or release electric energy according to the state of the intelligent switch; The auxiliary power supply circuit is arranged between the power supply circuit and the intelligent switch, and includes an energy storage circuit and a battery charging circuit, wherein: The output end of the energy storage circuit is connected to the input end of the power supply circuit, and the input end is connected to the output end of the battery charging circuit, and is configured to deliver stored electric energy to the power supply circuit when the intelligent switch is in an open state, and receive and store electric energy through the battery charging circuit when the intelligent switch is in a closed state; The battery charging circuit is connected to the main power supply via an intelligent switch, and is configured to transmit the electric energy of the main power supply to the lithium battery energy storage and discharge circuit when the intelligent switch is in a closed state.

2. The intelligent single fire switch circuit according to claim 1, characterized in that: The energy storage and discharge circuit includes a lithium battery energy storage and discharge circuit; the lithium battery energy storage and discharge circuit includes a lithium battery and a battery protection circuit; the battery protection circuit is arranged between the lithium battery and the power supply circuit, and includes a lithium battery protection module and a DCDC converter, the lithium battery protection module is configured to protect the lithium battery, and the DCDC converter is configured to adjust the voltage delivered to the power supply circuit.

3. The intelligent single fire switch circuit according to claim 2, characterized in that: The lithium battery protection module is connected to the MCU, and includes a protection integrated circuit, an overvoltage protection circuit, an undervoltage protection circuit, an overcurrent protection circuit and an overtemperature protection circuit. The lithium battery protection module is configured to control the corresponding protection circuit to perform protection operations on the lithium battery when the voltage value, current value or temperature value of the lithium battery exceeds the corresponding preset range, and to send a battery fault signal to the MCU through the protection integrated circuit.

4. The intelligent single fire switch circuit according to claim 1, characterized in that: The battery charging circuit includes a DCDC converter and a filter, wherein the DCDC converter is connected to the lithium battery energy storage and discharge circuit and is configured to adjust the voltage transmitted to the lithium battery energy storage and discharge circuit; the filter is connected to the DCDC converter and is configured to smooth the output voltage and current of the DCDC converter.

5. The intelligent single fire switch circuit according to claim 4, characterized in that: The battery charging circuit also includes a rectifier, the input end of the rectifier is connected to the main power supply, the output end is connected to the DCDC converter, and is configured to convert alternating current into direct current; the rectifier includes a diode bridge composed of four diodes.

6. The intelligent single fire switch circuit according to claim 5, characterized in that: The battery charging circuit also includes a current control device arranged between the rectifier and the DCDC converter, which is configured to adjust the current according to the state of the lithium battery; the current control device includes a current sensor and a control transistor; the current sensor is connected to the MCU, and is configured to monitor the current flowing out of the rectifier and transmit the current value to the MCU, so that the MCU generates a current control signal according to the current value and sends it to the control transistor; the control transistor is configured to adjust the current according to the received current control signal.

7. The intelligent single fire switch circuit according to claim 3, characterized in that: The lithium battery protection module also includes a voltage monitoring circuit connected to the lithium battery and the protection integrated circuit, and is configured to monitor the voltage value of the lithium battery and send it to the protection integrated circuit.

8. The intelligent single fire switch circuit according to claim 3, characterized in that: The lithium battery protection module also includes a current monitoring circuit connected to the lithium battery and the protection integrated circuit, wherein the current monitoring circuit is provided with a shunt resistor connected in series with the lithium battery; the current monitoring circuit is configured to monitor the current value of the lithium battery using the shunt resistor and send it to the protection integrated circuit.

9. The intelligent single fire switch circuit according to claim 3, characterized in that: The lithium battery protection module also includes a temperature sensor connected to the lithium battery and the protection integrated circuit, and is configured to monitor the temperature value of the lithium battery and send it to the protection integrated circuit.

10. The intelligent single fire switch circuit according to claim 3, characterized in that: The protection integrated circuit is respectively connected to the overvoltage protection circuit, the undervoltage protection circuit, the overcurrent protection circuit and the over-temperature protection circuit, and is configured to send control signals to the overvoltage protection circuit, the undervoltage protection circuit, the overcurrent protection circuit and / or the over-temperature protection circuit according to the voltage value, current value and temperature value of the lithium battery, and to receive feedback signals sent by the overvoltage protection circuit, the undervoltage protection circuit, the overcurrent protection circuit and the over-temperature protection circuit.

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