Fan light sub-control driving circuit and fan light

Abstract

The utility model provides a kind of lamp fan sub-control drive circuit and lamp fan, it is related to luminaire technical field.The lamp fan sub-control drive circuit includes: switch, main power module, lamp drive module, fan drive module, switch detection module and main control module;Switch is connected on live wire or zero line, lamp drive module, fan drive module are respectively used to drive lamp or fan;Switch detection module detects switch action, and main control module controls lamp or fan according to switch action;The single-direction conducting element in the main power module of the application is multiplexed, and the detection of switch state can be realized by connecting any one node before the single-direction conducting element of switch detection module;And the output end of main power module is provided with energy storage module, even if switch is opened, energy storage module discharges, still can guarantee that main control module normally works, only using one switch can realize the independent control of lamp and fan, circuit structure is simple, and cost is low.

Description

Technical Field

[0001] This utility model relates to the field of lighting technology, and in particular to a lamp fan control drive circuit and a lamp fan. Background Technology

[0002] A light fan is a type of home appliance that integrates lighting and air circulation. With the increasing demand for integrated and simplified home furnishings, light fans have been widely used.

[0003] In existing technologies, to achieve independent control of lights and fans, two independent control switches are typically required to control the live wires. One set of control switches is connected in series with the live wire of the light load, and the other set of switches is connected in series with the live wire of the fan load, together with a common neutral wire, forming a "two live wires and one neutral wire" wiring and control structure to achieve independent control of the light load and the fan load. However, this method has high wiring costs, cannot be compatible with single live wire scenarios, and requires two switches, resulting in high hardware costs. Utility Model Content

[0004] This utility model embodiment provides a separate control drive circuit for a light fan and a light fan, to solve the problems of high cost and poor scene compatibility in the prior art where light fans need to be controlled by two switches.

[0005] In a first aspect, this utility model provides a lamp and fan control drive circuit, including: a switch, a main power module, a lamp drive module, a fan drive module, a switch detection module, and a main control module; The first and second input terminals of the main power module are connected to the external neutral and live wires, respectively. The output terminals of the main power module are connected to the input terminals of the lamp driver module, the fan driver module, and the power supply terminal of the main control module, respectively. The switch is connected between the first input terminal of the main power module and the neutral wire, or between the second input terminal of the main power module and the live wire. The output of the lamp driver module is used to drive the lamp to emit light, and the output of the fan driver module is used to drive the fan to rotate. The control terminal of the lamp driver module is connected to the main control module and is used to receive lamp control signals sent by the main control module; The control terminal of the fan drive module is connected to the main control module and is used to receive the fan control signals sent by the main control module; The input terminal of the switch detection module is connected to the main power module to detect the operation of the switch, and sends the detected switch operation signal to the main control module through the output terminal of the switch detection module; the main control module generates lamp control signal and fan control signal based on the switch operation signal. The connection point between the input terminal of the switch detection module and the main power module, and the output terminal of the main power module are provided with a unidirectional conduction element. The connection point conducts unidirectionally to the output terminal of the main power module, and the output terminal of the main power module is provided with an energy storage module.

[0006] Optionally, the main power module includes: a rectifier unit, a buck unit, an RC absorption unit, and an output filter unit; The two input terminals of the rectifier unit are connected to the first and second input terminals of the main power module, respectively, and the two output terminals of the rectifier unit are connected to the two input terminals of the buck unit, respectively. The positive output terminal of the step-down unit is connected to the input terminal of the RC absorption unit, and the negative output terminal of the step-down unit is connected to the negative input terminal of the output filter unit. The positive input terminal of the output filter unit is connected to the output terminal of the RC absorption unit, the positive output terminal of the output filter unit is connected to the output terminal of the main power module, and the negative output terminal of the output filter unit is connected to the first ground terminal. The RC absorption unit includes a unidirectional conduction element, the output filter unit includes an energy storage module, and the connection point is located before the RC absorption unit, including the input terminal of the RC absorption unit.

[0007] Optionally, the RC absorption unit includes: a first resistor, a first capacitor, and a first diode; wherein, the unidirectional conducting element includes the first diode; The anode of the first diode is connected to the first terminal of the first resistor and the input terminal of the RC absorption unit, respectively, and the cathode of the first diode is connected to the first terminal of the first capacitor and the output terminal of the RC absorption unit, respectively. The second terminal of the first resistor is connected to the second terminal of the first capacitor.

[0008] Optionally, the output filtering unit includes: a first common-mode inductor, a first electrolytic capacitor, a second electrolytic capacitor, a third electrolytic capacitor, and a second resistor; wherein, the energy storage module includes the first electrolytic capacitor, the second electrolytic capacitor, and the third electrolytic capacitor; The first input terminal of the first common-mode inductor is connected to the first terminal of the first electrolytic capacitor, the first terminal of the second electrolytic capacitor, and the positive input terminal of the output filter unit. The second input terminal of the first common-mode inductor is connected to the second terminal of the first electrolytic capacitor, the second terminal of the second electrolytic capacitor, the negative input terminal of the output filter unit, and the second ground terminal. The first output terminal of the first common-mode inductor is connected to the first terminal of the third electrolytic capacitor, the first terminal of the second resistor, and the positive output terminal of the output filter unit. The second output terminal of the first common-mode inductor is connected to the second terminal of the third electrolytic capacitor, the second terminal of the second resistor, and the negative output terminal of the output filter unit.

[0009] Optionally, the connection point is the input terminal of the RC snubber unit; the switch detection module includes: a second diode, a third diode, a second capacitor, a third resistor, and a fourth resistor; The anode of the second diode is connected to the input terminal of the switch detection module, and the cathode of the second diode is connected to the first terminal of the third resistor and the first terminal of the second capacitor, respectively. The second end of the third resistor is connected to the cathode of the third diode and the first end of the fourth resistor, respectively. The anode of the third diode, the second terminal of the fourth resistor, and the second terminal of the second capacitor are all connected to the first ground terminal.

[0010] Optionally, the buck unit is a flyback switching power supply topology.

[0011] Optionally, the main control module includes: a main control power supply unit and a main control chip; The input terminal of the main control power supply unit is connected to the power supply terminal of the main control module, and the output terminal of the main control power supply unit supplies power to the main control chip; The main control chip is also connected to the control terminals of the lamp driver module, the fan driver module, and the switch detection module.

[0012] Optionally, the lamp driver module is a BUCK-type constant current drive topology.

[0013] Optionally, the fan drive module is a brushless DC motor drive topology.

[0014] In a second aspect, this utility model provides a lamp fan, including: a lamp, a fan, and a lamp fan control drive circuit as provided in the first aspect embodiment above; The separate control circuit for lights and fans is used to drive the lights and fans.

[0015] This utility model embodiment provides a lamp-fan split-control drive circuit and a lamp fan. The lamp-fan split-control drive circuit includes: a switch, a main power module, a lamp drive module, a fan drive module, a switch detection module, and a main control module; the first and second input terminals of the main power module are respectively connected to an external neutral wire and a live wire, and the output terminal of the main power module is respectively connected to the input terminals of the lamp drive module, the fan drive module, and the power supply terminal of the main control module; wherein, the switch is connected between the first input terminal of the main power module and the neutral wire, or the switch is connected between the second input terminal of the main power module and the live wire; the output terminal of the lamp drive module is used to drive the lamp to emit light, and the output terminal of the fan drive module is used to drive the fan to rotate; the control terminal of the lamp drive module is connected to the main control module. The main control module receives lighting control signals from the main control module; the control terminal of the fan drive module is connected to the main control module to receive fan control signals from the main control module; the input terminal of the switch detection module is connected to the main power module to detect the switch action and send the detected switch action signal to the main control module through the output terminal of the switch detection module; the main control module generates lighting control signals and fan control signals based on the switch action signal; wherein, a one-way conduction element is provided between the connection point of the input terminal of the switch detection module and the main power module and the output terminal of the main power module, and the connection point conducts unidirectionally to the output terminal of the main power module, and an energy storage module is provided at the output terminal of the main power module. The main power module is equipped with a unidirectional conducting element. This application reuses the unidirectional conducting element in the main power module. The switch detection module can be connected to any node before the unidirectional conducting element to realize the detection of the switch status. In addition, the output terminal of the main power module is equipped with an energy storage module. Even if the switch is opened and the energy storage module discharges, the main control module can still be guaranteed to work normally. The main control module controls the lamp or fan according to the switch action signal fed back by the switch detection module. Only one switch is used to realize the independent control of the lamp and fan. The circuit structure is simple and the cost is low. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the circuit structure of a lamp fan control drive circuit provided in an embodiment of the present utility model; Figure 2 This is a schematic diagram of the circuit structure of a main power module provided in an embodiment of the present utility model; Figure 3 This is a circuit diagram of an RC absorption unit and an output filter unit provided in an embodiment of the present invention; Figure 4 This is a circuit diagram of a switch detection module provided in an embodiment of the present invention; Figure 5 This is a circuit schematic diagram of a main power module provided in an embodiment of the present invention; Figure 6This is a circuit diagram of a main control power supply unit provided in an embodiment of this utility model; Figure 7 This is a circuit schematic diagram of a main control chip provided in an embodiment of this utility model; Figure 8 This is a circuit diagram of a lamp driver module provided in an embodiment of the present invention; Figure 9 This is a circuit diagram of a fan drive module provided in an embodiment of the present invention; Figure 10 This is a circuit diagram of a remote control signal receiving module provided in an embodiment of this utility model. Detailed Implementation

[0017] To enable those skilled in the art to better understand this solution, the technical solutions in the embodiments of this solution will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this solution, not all of them. Based on the embodiments of this solution, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this solution.

[0018] The term "comprising" and any other variations thereof in the specification, claims, and accompanying drawings of this invention mean "including but not limited to," and are intended to cover a non-exclusive inclusion, not limited to the examples listed herein. Furthermore, the terms "first" and "second," etc., are used to distinguish different objects, not to describe a specific order.

[0019] The implementation of this utility model will be described in detail below with reference to the accompanying drawings: Figure 1 This is a schematic diagram of a lamp fan control drive circuit provided in an embodiment of the present utility model. (Refer to...) Figure 1 The light and fan control drive circuit includes: switch K1, main power module 1, light drive module 2, fan drive module 3, switch detection module 4, and main control module 5; The first and second input terminals of the main power module 1 are connected to the external neutral wire (N) and live wire (L) respectively. The output terminal of the main power module 1 is connected to the input terminal of the lamp driver module 2, the input terminal of the fan driver module 3, and the power supply terminal of the main control module 5 respectively. The switch K1 is connected between the first input terminal of the main power module 1 and the neutral wire, or the switch K1 is connected between the second input terminal of the main power module 1 and the live wire. The output of lamp driver module 2 is used to drive lamp 6 to emit light, and the output of fan driver module 3 is used to drive fan 7 to rotate. The control terminal of the lamp driver module 2 is connected to the main control module 5 and is used to receive the lamp control signals sent by the main control module 5; The control terminal of the fan drive module 3 is connected to the main control module 5 and is used to receive the fan control signal sent by the main control module 5; The input terminal of the switch detection module 4 is connected to the main power module 1 to detect the action of switch K1, and sends the detected switch action signal to the main control module 5 through the output terminal of the switch detection module 4; the main control module 5 generates lamp control signal and fan control signal according to the switch action signal. Among them, a one-way conduction element is provided between the connection point of the input terminal of the switch detection module 4 and the connection point of the main power module 1 and the output terminal of the main power module 1. The connection point conducts unidirectionally to the output terminal of the main power module 1, and an energy storage module is provided at the output terminal of the main power module 1.

[0020] The main power module 1 converts the input AC power into a suitable stable voltage, providing operating power to the lamp driver module 2, fan driver module 3, and main control module 5. The input terminal of the switch detection module 4 is connected to the main power module 1, monitoring the on / off state of switch K1 in real time. When the user operates switch K1, the voltage or current state at the input terminal of the main power module 1 changes. The switch detection module 4 captures this change, converts it into a switch action signal, and sends it to the main control module 5. Upon receiving the switch action signal, the main control module 5 generates lamp control signals and fan control signals according to preset logic. Specifically, when the user closes switch K1, the lamp and fan operate according to the previously memorized state; if the user operates switch K1 "close-open-close" within a preset time, the state of lamp 6 (or fan 7) changes; if the user continues to operate switch K1 "open-close" within the preset time, the state of fan 7 (or lamp 6) changes; if the final lamp / fan state is "lamp off + fan stopped," the lamp / fan will automatically start in the initial operating state of "lamp on + fan running" the next time it runs. This application allows for independent control of both light 6 and fan 7 with a single switch K1, significantly reducing the amount of wiring required. Even when switch K1 is far from the light or fan, only one neutral and one live wire are needed, without increasing the amount of cabling. Furthermore, since no additional live wire is required, existing building wiring can be reused, adapting to current single-switch home wiring scenarios. The use of only one switch eliminates the need for creating new wiring channels for a second switch, reducing installation difficulty, wiring costs, and switch costs.

[0021] Meanwhile, by reusing the unidirectional conduction element of the main power module 1, the switch detection module 4 can be connected to any node before the unidirectional conduction element to detect the switch action, ensuring accurate switch action detection. The energy storage module can provide short-term power to the main control module 5 when the switch K1 switches instantaneously, preventing circuit abnormalities due to momentary power outages, ensuring normal circuit operation, and improving the stability and reliability of the circuit.

[0022] In one possible implementation, refer to Figure 2The main power module 1 may include: a rectifier unit 11, a step-down unit 12, an RC absorption circuit (RC absorption circuit, resistor-capacitor absorption unit) 13, and an output filter unit 14. The two input terminals of the rectifier unit 11 are connected to the first input terminal and the second input terminal of the main power module 1, respectively, and the two output terminals of the rectifier unit 11 are connected to the two input terminals of the step-down unit 12, respectively. The positive output terminal of the step-down unit 12 is connected to the input terminal of the RC absorption unit 13, and the negative output terminal of the step-down unit 12 is connected to the negative input terminal of the output filter unit 14. The positive input terminal of the output filter unit 14 is connected to the output terminal of the RC absorption unit 13, the positive output terminal of the output filter unit 14 is connected to the output terminal of the main power module 1, and the negative output terminal of the output filter unit 14 is connected to the first ground terminal (SG). The RC absorption unit 13 includes a unidirectional conduction element, the output filter unit 14 includes an energy storage module, and the connection point is located before the RC absorption unit 13, including the input terminal of the RC absorption unit 13.

[0023] The input terminal of the rectifier unit 11 is connected to the live wire and neutral wire interfaces of the main power module 1 for rectification; The input terminal of the step-down unit 12 is connected to the output terminal of the rectifier unit 11, and is used to convert the rectified high-voltage pulsating DC voltage into the low-voltage DC voltage (such as +24V) required by the circuit to meet the power supply requirements of the lamp driver module 2, the fan driver module 3 and the main control module 5.

[0024] The RC absorption unit 13 typically includes a resistor, a capacitor, and a unidirectional conducting element, which is used to absorb voltage spikes and electromagnetic interference generated when the step-down unit 12 is working, so as to avoid high-frequency interference signals from affecting the detection accuracy of the switch detection module 4. At the same time, the unidirectional conducting element can also limit the current to flow only from the connection point to the output filter unit 14, prevent the energy storage module of the output filter unit 14 from discharging in reverse to the connection point, and prevent reverse current from interfering with the switch detection module 4's judgment of the mains power on / off state.

[0025] In one possible implementation, refer to Figure 3 The RC absorption unit 13 includes: a first resistor R1, a first capacitor C1, and a first diode D1; wherein, the unidirectional conducting element includes the first diode D1; The anode of the first diode D1 is connected to the first terminal of the first resistor R1 and the input terminal of the RC absorption unit 13, respectively, and the cathode of the first diode D1 is connected to the first terminal of the first capacitor C1 and the output terminal of the RC absorption unit 13, respectively. The second terminal of the first resistor R1 is connected to the second terminal of the first capacitor C1.

[0026] The first resistor R1 and the first capacitor C1 are connected in series to form an RC filter. When there is a voltage spike, the first capacitor C1 is charged through the first resistor R1 to quickly store the spike energy. The first resistor R1 limits the charging current to prevent the capacitor from being damaged by the instantaneous large current charging. The first diode D1 is unidirectionally conductive. When the buck unit 12 outputs a normal operating voltage, the current can pass through the first diode D1 and through the series RC circuit (which has a high impedance and serves as an auxiliary path), without affecting the main power module 1's power supply to subsequent circuits. At the same time, the first diode D1 also provides a discharge path for the first capacitor C1, ensuring that the first capacitor C1 is in an unloaded state for absorption in each cycle, thereby improving the peak suppression effect.

[0027] This application reuses the first diode D1. The energy storage module of the output filter unit 14 stores stable DC power. If the capacitor discharges in reverse to the input terminal, the first diode D1 is reverse cut off, interrupting the reverse discharge path. The output filter unit 14 can then provide short-term power to the main control module 5, ensuring normal circuit operation. Simultaneously, the voltage or current at the front end of the first diode D1 changes due to the switching of switch K1, which can be detected by the switch detection module 4. The switch detection module 4 can be connected to any point at the front end of the first diode D1, including the anode of the first diode D1, improving the circuit's adaptability.

[0028] In one possible implementation, refer to Figure 3 The output filtering unit 14 may include: a first common-mode inductor LF1, a first electrolytic capacitor EC1, a second electrolytic capacitor EC2, a third electrolytic capacitor EC3, and a second resistor R2; wherein, the energy storage module includes the first electrolytic capacitor EC1, the second electrolytic capacitor EC2, and the third electrolytic capacitor EC3. The first input terminal of the first common-mode inductor LF1 is connected to the first terminal of the first electrolytic capacitor EC1, the first terminal of the second electrolytic capacitor EC2, and the positive input terminal of the output filter unit 14. The second input terminal of the first common-mode inductor LF1 is connected to the second terminal of the first electrolytic capacitor EC1, the second terminal of the second electrolytic capacitor EC2, the negative input terminal of the output filter unit 14, and the second ground terminal (G1). The first output terminal of the first common-mode inductor LF1 is connected to the first terminal of the third electrolytic capacitor EC3, the first terminal of the second resistor R2, and the positive output terminal of the output filter unit 14. The second output terminal of the first common-mode inductor LF1 is connected to the second terminal of the third electrolytic capacitor EC3, the second terminal of the second resistor R2, and the negative output terminal of the output filter unit 14.

[0029] This application adopts a multi-stage filtering architecture using electrolytic capacitors and common-mode inductors, which can effectively improve the quality of the power output from the main power module 1 and ensure the stable operation of the lamps, fans and main control module 5.

[0030] Meanwhile, the energy stored in the three electrolytic capacitors ensures the stability of the power supply to the main control module 5 when switch K1 is briefly disconnected, thus ensuring the normal operation of the circuit.

[0031] In one possible implementation, refer to Figure 4 The connection point is the input terminal of the RC absorption unit 13; the switch detection module 4 includes: a second diode D2, a third diode D3, a second capacitor C2, a third resistor R3 and a fourth resistor R4; The anode of the second diode D2 is connected to the input terminal of the switch detection module 4, and the cathode of the second diode D2 is connected to the first terminal of the third resistor R3 and the first terminal of the second capacitor C2 respectively. The second end of the third resistor R3 is connected to the cathode of the third diode D3 and the first end of the fourth resistor R4, respectively. The anode of the third diode D3, the second terminal of the fourth resistor R4, and the second terminal of the second capacitor C2 are all connected to the first ground terminal (SG).

[0032] The second diode D2 conducts unidirectionally, allowing forward voltage signals to pass through while blocking reverse interference current. The third resistor R3 and the fourth resistor R4 form a voltage divider to match the signal acquisition threshold of the main control module 5; the third diode D3 clamps the signal, providing reverse clamping protection when the input voltage of the main power module 1 is overvoltage.

[0033] In this application, the switch detection module 4 can be connected to the input terminal of the RC absorption unit 13, see reference. Figure 4 and Figure 5 When the user operates switch K1 to close or open, the voltage at the input terminal of the main power module 1 will change abruptly, and the input terminal of the RC absorption unit 13 will also change abruptly: when switch K1 is closed, the mains power is rectified and stepped down to output DC voltage, and the switch detection module 4 outputs a high level; when switch K1 is open, the voltage at the input terminal of the RC absorption unit 13 drops, and the switch detection module 4 outputs a low level. Therefore, the main control module 5 determines the action of switch K1 based on the amplitude of the voltage signal, for the independent control of lamp 6 and fan 7.

[0034] In one possible implementation, refer to Figure 5 The step-down unit 12 can be a flyback switching power supply topology.

[0035] The circuit schematics of each unit in main control module 5 are for reference. Figure 5 The specifics will not be elaborated here.

[0036] In one possible implementation, the main control module 5 may include: a main control power supply unit and a main control chip; The input terminal of the main control power supply unit is connected to the power supply terminal of the main control module 5, and the output terminal of the main control power supply unit supplies power to the main control chip; The main control chip is also connected to the control terminal of the lamp driver module 2, the control terminal of the fan driver module 3, and the output terminal of the switch detection module 4.

[0037] Circuit schematic diagram reference for main control power supply unit Figure 6 Reference to the circuit schematic of the main control chip Figure 7 The specifics will not be elaborated here.

[0038] In one possible implementation, the lamp driver module 2 is a BUCK-type constant current drive topology.

[0039] Circuit schematic reference for lamp driver module 2 Figure 8 The specifics will not be elaborated here.

[0040] In one possible implementation, the fan drive module 3 can be a brushless DC motor drive topology.

[0041] Circuit schematic reference for fan drive module 3 Figure 9 The specifics will not be elaborated here.

[0042] In one possible implementation, the light and fan control drive circuit may further include: a remote control signal receiving module; The remote control signal receiving module is used to receive external control commands sent by the user and send the external control commands to the main control module 5.

[0043] Circuit schematic diagram reference for remote control signal receiving module Figure 10 The specifics will not be elaborated here.

[0044] Corresponding to the above embodiments, this utility model embodiment also provides a lamp fan, including: a lamp, a fan, and a lamp fan control drive circuit provided in any of the above embodiments; The separate control circuit for lights and fans is used to drive the lights and fans.

[0045] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, 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. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A light fan control drive circuit, characterized in that, include: Switch, main power module, lamp driver module, fan driver module, switch detection module and main control module; The first and second input terminals of the main power module are respectively connected to the external neutral wire and live wire. The output terminal of the main power module is respectively connected to the input terminal of the lamp driver module, the input terminal of the fan driver module, and the power supply terminal of the main control module. The switch is connected between the first input terminal of the main power module and the neutral wire, or the switch is connected between the second input terminal of the main power module and the live wire. The output of the lamp driver module is used to drive the lamp to emit light, and the output of the fan driver module is used to drive the fan to rotate. The control terminal of the lamp driver module is connected to the main control module and is used to receive lamp control signals sent by the main control module; The control terminal of the fan drive module is connected to the main control module and is used to receive the fan control signal sent by the main control module; The input terminal of the switch detection module is connected to the main power module to detect the operation of the switch, and sends the detected switch operation signal to the main control module through the output terminal of the switch detection module; the main control module generates the lamp control signal and the fan control signal according to the switch operation signal. The connection point between the input terminal of the switch detection module and the main power module, and the output terminal of the main power module are provided with a unidirectional conduction element. The connection point conducts unidirectionally to the output terminal of the main power module, and the output terminal of the main power module is provided with an energy storage module.

2. The light and fan control drive circuit as described in claim 1, characterized in that, The main power module includes: a rectifier unit, a step-down unit, an RC absorption unit, and an output filter unit; The two input terminals of the rectifier unit are respectively connected to the first input terminal and the second input terminal of the main power module, and the two output terminals of the rectifier unit are respectively connected to the two input terminals of the buck unit. The positive output terminal of the step-down unit is connected to the input terminal of the RC absorption unit, and the negative output terminal of the step-down unit is connected to the negative input terminal of the output filter unit. The positive input terminal of the output filter unit is connected to the output terminal of the RC absorption unit, the positive output terminal of the output filter unit is connected to the output terminal of the main power module, and the negative output terminal of the output filter unit is connected to the first ground terminal. The RC absorption unit includes the unidirectional conduction element, the output filtering unit includes the energy storage module, and the connection point is located before the RC absorption unit, including the input terminal of the RC absorption unit.

3. The light and fan control drive circuit as described in claim 2, characterized in that, The RC absorption unit includes: a first resistor, a first capacitor, and a first diode; wherein, the unidirectional conducting element includes the first diode; The anode of the first diode is connected to the first terminal of the first resistor and the input terminal of the RC absorption unit, respectively, and the cathode of the first diode is connected to the first terminal of the first capacitor and the output terminal of the RC absorption unit, respectively. The second end of the first resistor is connected to the second end of the first capacitor.

4. The light and fan control drive circuit as described in claim 2, characterized in that, The output filtering unit includes: a first common-mode inductor, a first electrolytic capacitor, a second electrolytic capacitor, a third electrolytic capacitor, and a second resistor; wherein, the energy storage module includes the first electrolytic capacitor, the second electrolytic capacitor, and the third electrolytic capacitor; The first input terminal of the first common-mode inductor is connected to the first terminal of the first electrolytic capacitor, the first terminal of the second electrolytic capacitor, and the positive input terminal of the output filter unit. The second input terminal of the first common-mode inductor is connected to the second terminal of the first electrolytic capacitor, the second terminal of the second electrolytic capacitor, the negative input terminal of the output filter unit, and the second ground terminal. The first output terminal of the first common-mode inductor is connected to the first terminal of the third electrolytic capacitor, the first terminal of the second resistor, and the positive output terminal of the output filter unit. The second output terminal of the first common-mode inductor is connected to the second terminal of the third electrolytic capacitor, the second terminal of the second resistor, and the negative output terminal of the output filter unit.

5. The light and fan control drive circuit as described in claim 2, characterized in that, The connection point is the input terminal of the RC absorption unit; the switch detection module includes: a second diode, a third diode, a second capacitor, a third resistor, and a fourth resistor; The anode of the second diode is connected to the input terminal of the switch detection module, and the cathode of the second diode is connected to the first terminal of the third resistor and the first terminal of the second capacitor, respectively. The second end of the third resistor is connected to the cathode of the third diode and the first end of the fourth resistor, respectively. The anode of the third diode, the second terminal of the fourth resistor, and the second terminal of the second capacitor are all connected to the first ground terminal.

6. The light and fan control drive circuit as described in claim 2, characterized in that, The step-down unit is a flyback switching power supply topology.

7. The lamp / fan control drive circuit as described in any one of claims 1 to 6, characterized in that, The main control module includes: a main control power supply unit and a main control chip; The input terminal of the main control power supply unit is connected to the power supply terminal of the main control module, and the output terminal of the main control power supply unit supplies power to the main control chip. The main control chip is also connected to the control terminal of the lamp driver module, the control terminal of the fan driver module, and the output terminal of the switch detection module.

8. The lamp / fan control drive circuit as described in any one of claims 1 to 6, characterized in that, The lamp driver module is a BUCK-type constant current drive topology.

9. The lamp / fan control drive circuit as described in any one of claims 1 to 6, characterized in that, The fan drive module is a brushless DC motor drive topology.

10. A lamp fan, characterized in that, include: Lamp, fan, and lamp / fan control drive circuit as described in any one of claims 1 to 9; The lamp and fan control drive circuit is used to drive the lamp and the fan.

Images