Control circuit

Abstract

The utility model provides a control circuit which comprises a fan control circuit which comprises a first filtering and rectifying circuit and a motor driving circuit, the first filtering and rectifying circuit converts alternating current into direct current and supplies the direct current to the motor driving circuit, and the motor driving circuit drives a fan to rotate; the LED control circuit comprises a second filtering and rectifying circuit, a booster circuit and a constant current circuit, the second filtering and rectifying circuit converts alternating current into direct current and supplies the direct current to the booster circuit, the direct current is boosted by the booster circuit and then supplied to the constant current circuit, and then the constant current circuit outputs constant current to the LED; the main control circuit is respectively connected with the fan control circuit and the LED control circuit and is used for controlling the working states of the fan and the LED; and the relay comprises a first relay connected to the first filtering and rectifying circuit and a second relay connected to the second filtering and rectifying circuit, and the first relay and the second relay are controlled by the main control circuit to be switched on and off. Compared with the prior art, the control circuit can control related circuits to stop working according to actual needs, and low power consumption is achieved.

Description

Technical Field

[0001] The utility model relates to a control circuit, which is mainly used for fan lamps, fan heaters, bathroom heaters and air purification lamps, and belongs to the technical field of automatic control. Background Art

[0002] Fan lights, air conditioners, bathroom heaters and air purifier lights are widely used in various technical fields because they have both fan and lighting functions.

[0003] Conventional control circuits for fan lamps, air conditioners, bathroom heaters, and air purifier lamps typically consist of separate fan drive circuits, LED drive circuits, and a main control circuit. While this design can meet general usage requirements, it significantly increases driver costs and, due to the increased number of circuits, causes standby power consumption to exceed requirements. This design fails to meet the Class I energy efficiency requirements for fan lamps, air conditioners, bathroom heaters, and air purifier lamps, or the low standby power consumption requirements of the European ERP.

[0004] In view of this, it is indeed necessary to improve the existing control circuit to solve the above problems. Utility Model Content

[0005] The purpose of the utility model is to provide a control circuit, which can control related circuits to stop working according to actual needs to achieve low power consumption.

[0006] To achieve the above object, the present invention provides a control circuit, comprising:

[0007] The fan control circuit includes a first filtering and rectifying circuit and a motor driving circuit. The first filtering and rectifying circuit is used to convert alternating current into direct current and supply the direct current to the motor driving circuit, which drives the fan to rotate.

[0008] The LED control circuit includes a second filter and rectifier circuit, a boost circuit, and a constant current circuit connected in sequence. The second filter and rectifier circuit is used to convert AC power into DC power and supply it to the boost circuit. The boost circuit boosts the power and supplies it to the constant current circuit. The constant current circuit then outputs a constant current to supply the LED.

[0009] A main control circuit is connected to the fan control circuit and the LED control circuit respectively, and is used to control the working states of the fan and the LED; and

[0010] The relay includes a first relay connected to the first filter and rectifier circuit and a second relay connected to the second filter and rectifier circuit. The first relay and the second relay are both electrically connected to the main control circuit, and the main control circuit controls the on and off of the first relay and the second relay. In this way, the main control circuit can be used to control the fan or LED to stop working, thereby reducing power consumption; the main control circuit can also be used to control the on and off of the first relay and the second relay, further reducing power consumption.

[0011] Optionally, the fan control circuit also includes a constant voltage power supply circuit, the input end of the constant voltage power supply circuit is connected to the output end of the first filter and rectifier circuit, for receiving the high voltage direct current output by the first filter and rectifier circuit, and the output end of the constant voltage power supply circuit is connected to the input end of the motor drive circuit, for providing low voltage direct current to the motor drive circuit.

[0012] Optionally, the main control circuit is connected to at least one of the motor drive circuit and the constant voltage power supply circuit. In this way, the main control circuit can be used to control at least one of the motor drive circuit and the constant voltage power supply circuit to stop working, causing the fan to stop rotating, thereby reducing power consumption.

[0013] Optionally, the main control circuit is connected to at least one of the boost circuit and the constant current circuit. In this way, the main control circuit can be used to control at least one of the boost circuit and the constant current circuit to stop working, so that the LED light is turned off, thereby reducing power consumption.

[0014] Optionally, the control circuit further includes an EMI filter circuit, the input end of which is connected to the mains power supply, and the output end of which is connected to the input end of the first filter and rectifier circuit and the input end of the second filter and rectifier circuit, respectively. In this way, the mains power supply is filtered and interference is processed.

[0015] Optionally, the control circuit further includes a low-voltage power supply circuit, the input of which is connected to the output of the first filter-rectifier circuit and the output of the boost circuit, respectively. The output of the low-voltage power supply circuit is connected to the main control circuit to supply power to the main control circuit. In this way, the low power consumption inherent in the low-voltage power supply circuit can be utilized to achieve lower standby power consumption for the fan light, achieving truly low power consumption.

[0016] Optionally, the output of the first filter and rectifier circuit outputs a first DC power supply, which is transmitted to the input of the low-voltage power supply circuit via diode D5. The output of the boost circuit outputs a second DC power supply, which is transmitted to the input of the low-voltage power supply circuit via diode D6. Diodes D5 and D6 form an OR gate circuit. This can address the issue of the low-voltage power supply circuit affecting lamp harmonics, which may not meet standards.

[0017] Optionally, the control circuit further includes an input signal sampling circuit, wherein the input end of the input signal sampling circuit is connected to the second filter and rectifier circuit, the output end is connected to the main control circuit, and the input end of the input signal sampling circuit is connected between the output end of the second filter and rectifier circuit and the input end of the second relay, so as to sample the voltage before it flows into the second relay. In this way, the disconnection or closing of the mains input can be quickly reflected.

[0018] Optionally, the main control circuit and the motor drive circuit are integrated into the same circuit, and the first relay is in a normally closed state.

[0019] Optionally, the main control circuit is a control signal input interface of an external control module, and the external control module includes one or more of a temperature detection module, a humidity detection module, a PM2.5 detection module, a wireless communication module, a display module, a voice module and a wireless remote control module.

[0020] The beneficial effects of the present invention are as follows: on the one hand, the control circuit of the present invention sets the main control circuit to be connected to the fan control circuit and the LED control circuit respectively, so that the main control circuit can be used to control the working status of the fan and the LED, and the fan or the LED can be controlled to stop working according to actual needs, thereby reducing power consumption; on the other hand, by setting the first relay on the first filtering and rectifying circuit and the second relay on the second filtering and rectifying circuit, the main control circuit can be used to control the on and off of the first relay and the second relay, thereby further reducing power consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a circuit principle diagram of a control circuit in accordance with a preferred embodiment of the present utility model.

[0022] Figure 2 yes Figure 1 Timing logic diagram of the I / O port of the main control circuit.

[0023] Figure 3 This is a circuit principle diagram of the second embodiment of the control circuit of the utility model.

[0024] Figure 4 This is a circuit principle diagram of the third embodiment of the control circuit of the utility model.

[0025] Reference numerals:

[0026] 10-fan control circuit, 11-first filter and rectifier circuit, B1-first bridge rectifier circuit, 12-motor drive circuit, 13-constant voltage power supply circuit, K3-first relay;

[0027] 20-LED control circuit, 21-second filter rectifier circuit, B2-second bridge rectifier circuit, 22-boost circuit, 23-first constant current circuit, 24-second constant current circuit, K1-second relay;

[0028] 30-main control circuit, 40-input signal sampling circuit, 50-external module control interface, K2-third relay, 60-low voltage power supply circuit. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] like Figure 1 As shown, this utility model discloses a control circuit that is primarily used in appliances with both fans and LEDs, such as fan lamps, air conditioners, bathroom heaters, and air purifier lamps. This circuit controls fan rotation and LED on / off, while achieving low power consumption. Because this utility model's control circuit has a wide range of applications, the following description will use a fan lamp as an example to explain the specific structure and operating principle of this utility model's control circuit in detail.

[0031] The control circuit mainly includes a fan control circuit 10, an LED control circuit 20, a main control circuit 30, and a relay. The main control circuit 30 is connected to the fan control circuit 10 and the LED control circuit 20 respectively, so as to control the working status of the fan and the LED and achieve low power consumption.

[0032] The fan control circuit 10 includes a first filter and rectifier circuit 11, a constant voltage power supply circuit 13, and a motor drive circuit 12. The first filter and rectifier circuit 11 is connected to the AC mains power supply and is used to convert the AC mains power supply into high-voltage DC (VD) and supply it to the constant voltage power supply circuit 13. The constant voltage power supply circuit 13 converts the high-voltage DC (VD) into low-voltage DC (DC) and supplies it to the motor drive circuit 12. The motor drive circuit 12 then converts the high-voltage DC (VD) into three-phase AC power and supplies it to the fan motor, which then drives the fan to rotate. In this embodiment, the fan motor is a brushless DC motor. Furthermore, in other embodiments, the constant voltage power supply circuit 13 may not be provided. In this case, the first filter and rectifier circuit 11 directly supplies the high-voltage DC (VD) to the motor drive circuit 12, achieving high-voltage drive.

[0033] Specifically, the first filtering and rectifying circuit 11 includes a first bridge rectifier circuit B1 and a first filtering circuit connected to the first bridge rectifier circuit B1. The first bridge rectifier circuit B1 is composed of four diodes D1 to D4 and is used to rectify AC power into DC power. The first filtering circuit is a first π-type filtering circuit composed of a capacitor C1, an inductor L1, and a capacitor C2. The two ends of the first π-type filtering circuit are respectively connected to the two output terminals of the first bridge rectifier circuit B1 to filter out ripple in the DC power output by the first bridge rectifier circuit B1, thereby reducing the ripple coefficient of the output DC power and making the waveform smoother.

[0034] The input end of the constant voltage power supply circuit 13 is connected to the output end of the first filter circuit, and is used to receive the high-voltage direct current VD after passing through the first filter circuit and reduce the high-voltage direct current VD to a low-voltage direct current DC. The output end of the constant voltage power supply circuit 13 is connected to the input end of the motor drive circuit 12, and is used to provide the low-voltage direct current DC to the motor drive circuit 12. After receiving the low-voltage direct current DC, the motor drive circuit 12 converts it into three-phase alternating current and supplies it to the fan motor, which drives the fan to rotate. Optionally, the specific circuits of the constant voltage power supply circuit 13 and the motor drive circuit 12 can adopt existing technical solutions and are not limited here.

[0035] The LED control circuit 20 includes a second filter and rectifier circuit 21, a boost circuit 22, and a constant current circuit, which are connected in sequence. The second filter and rectifier circuit 21 converts AC power into DC power and supplies it to the boost circuit 22. The boost circuit 22 then boosts the voltage and supplies it to the constant current circuit, which then outputs a constant current to the LEDs.

[0036] Specifically, the second filtering and rectifying circuit 21 includes a second bridge rectifier circuit B2 and a second filtering circuit connected to the second bridge rectifier circuit B2. The second bridge rectifier circuit B2 is composed of four diodes D7-D10 and is used to rectify AC power into DC power. The second filtering circuit is a second π-type filtering circuit composed of a capacitor C3, an inductor L2, and a capacitor C4. The two ends of the second π-type filtering circuit are respectively connected to the two output terminals of the second bridge rectifier circuit B2 to filter out ripple in the DC power output by the second bridge rectifier circuit B2, thereby reducing the ripple factor of the output DC power and making the waveform smoother.

[0037] Optionally, boost circuit 22 is an APFC circuit, or active power factor correction circuit, configured to receive the high-voltage DC power after passing through the second filter circuit and boost it to generate DC power VC. The APFC circuit reduces harmonics generated by rectification and filtering, achieving a higher power factor to comply with the harmonic requirements of GB 17625.1. After boosting, DC power VC is greater than high-voltage DC power VD.

[0038] In this embodiment, the fan control circuit 10 does not include an APFC circuit because fans are electrical appliances and generally only meet harmonic requirements when their input power exceeds 75W. However, fan input power is generally less than 50W, and the national standard stipulates no harmonic requirements for inputs ≤ 75W. However, lighting power exceeding 5W does have harmonic requirements, and an APFC circuit is required when the lighting power exceeds 25W to meet the relevant requirements.

[0039] Optionally, the constant current circuit is provided with two paths, namely a first constant current circuit 23 and a second constant current circuit 24. Direct current VC is supplied to the first constant current circuit 23 and the second constant current circuit 24, respectively, and these two constant current circuits output constant currents to the LEDs, respectively, to control the lighting of the LEDs. The specific circuits of the first constant current circuit 23 and the second constant current circuit 24 can adopt existing technical solutions and are not limited here. Of course, the constant current circuit can also be provided with a third or more paths, all of which are controlled by the main control circuit 30 according to demand. The specific number of paths of the constant current circuit is not limited here.

[0040] Optionally, the control circuit also includes a fuse F connected to the AC mains and an EMI filter circuit connected to the fuse F. The fuse F is connected to the live wire of the AC mains (referred to as the L line) and is also called a current fuse. When the current abnormally rises to a certain height and temperature, the fuse F can melt itself to cut off the current, thereby protecting the safe operation of the control circuit. The input end of the EMI filter circuit is connected to the AC mains for interference processing. The output end of the EMI filter circuit is respectively connected to the input end of the first filter rectifier circuit 11 and the input end of the second filter rectifier circuit 21. That is, the fan control circuit 10 and the LED control circuit 20 of the utility model are integrated into one and share an EMI filter circuit.

[0041] The relays include a first relay K3 connected to the first filter and rectifier circuit 11 and a second relay K1 connected to the second filter and rectifier circuit 21. Both the first relay K3 and the second relay K1 are electrically connected to the main control circuit 30, which controls the on and off of the first relay K3 and the second relay K1.

[0042] Specifically, one end of the first relay K3 is connected between the inductor L1 and the capacitor C2, and the other end is connected to the main control circuit 30. In order to clearly describe the voltage difference before and after the first relay K3, Figure 1In this example, VDC represents the voltage before the first relay K3, and VD represents the voltage after the first relay K3. When the first relay K3 is disconnected, the constant voltage power supply circuit 13 and the motor drive circuit 12 stop operating. At this time, VD = 0V, and VDC is the voltage of the AC power after rectification and filtering. When the first relay K3 is closed, the fan control circuit 10 is turned on, and the constant voltage power supply circuit 13 and the motor drive circuit 12 operate normally. At this time, VDC = VD.

[0043] One end of the second relay K1 is connected between the inductor L2 and the capacitor C4, and the other end is connected to the main control circuit 30. When the second relay K1 is disconnected, the boost circuit 22 and the first and second constant current circuits 23 and 24 stop operating, the DC voltage VC = 0V, and the LED turns off. When the second relay K1 is closed, the LED control circuit 20 turns on, the boost circuit 22 and the first and second constant current circuits 23 and 24 operate normally, and the LED lights up.

[0044] The main control circuit 30 is connected to the fan control circuit 10 and the LED control circuit 20, respectively, thereby controlling fan rotation and adjusting the LED on / off, thereby achieving low power consumption. Specifically, the main control circuit 30 is connected to at least one of the motor drive circuit 12 and the constant voltage power supply circuit 13, thereby enabling the control circuit 30 to stop operating at least one of the motor drive circuit 12 and the constant voltage power supply circuit 13 according to actual conditions, thereby reducing power consumption. The main control circuit 30 is also connected to at least one of the boost circuit 22 and the constant current circuit, thereby enabling the control circuit 30 to stop operating at least one of the boost circuit 22 and the constant current circuit according to actual conditions, thereby reducing power consumption.

[0045] In this embodiment, the main control circuit 30 is connected to the motor drive circuit 12 and the constant voltage power supply circuit 13, respectively. The main control circuit 30 can send a KZ05 signal to the constant voltage power supply circuit 13 to control the operation or shutdown of the constant voltage power supply circuit 13 and the motor drive circuit 12, thereby reducing standby power consumption. Of course, the constant voltage power supply circuit 13 and the motor drive circuit 12 can also be shut down by controlling the first relay K3 to further reduce power consumption. The main control circuit 30 can also send a KZ06 signal to the motor drive circuit 12 to control the speed, shutdown, and forward and reverse rotation of the fan motor. For example, a fixed-frequency PWM signal can be used to control the speed and forward and reverse rotation of the fan motor, while a signal outside the fixed frequency range can be used to shut down the fan motor.

[0046] The main control circuit 30 is also connected to the boost circuit 22, the first constant current circuit 23, and the second constant current circuit 24, respectively. The main control circuit 30 can send a KZ01 signal to the second constant current circuit 24 to control the output current of the second constant current circuit 24 and to stop the operation. The main control circuit 30 can also send a KZ02 signal to the first constant current circuit 23 to control the output current of the first constant current circuit 23 and to stop the operation. The main control circuit 30 can also send a KZ03 signal to the boost circuit 22 and the second relay K1 to control the second relay K1 to close or open, or to control the boost circuit 22 to operate or stop. When the second relay K1 is open, the power supply to the boost circuit 22, the first constant current circuit 23, and the second constant current circuit 24 is disconnected, and no power is generated, thereby achieving the purpose of reducing power consumption.

[0047] It should be noted that when the boost circuit 22, the first constant current circuit 23, and the second constant current circuit 24 are stopped by the KZ03 signal, only the standby power consumption can be appropriately reduced. Because the boost circuit 22, the first constant current circuit 23, and the second constant current circuit 24 have some internal resistance, these internal resistances will still generate a certain amount of power consumption, but the power consumption at this time is relatively low.

[0048] Optionally, the control circuit of the present invention further includes an input signal sampling circuit 40 connected between the second filter and rectifier circuit 21 and the main control circuit 30. Preferably, the input end of the input signal sampling circuit 40 is connected to the second filter and rectifier circuit 21, and the output end is connected to the main control circuit 30. The input end of the input signal sampling circuit 40 is connected between the output end of the second filter and rectifier circuit 21 and the input end of the second relay K1, and DAC sampling is performed on the voltage before it flows into the second relay K1. More specifically, the input end of the input signal sampling circuit 40 is connected between the output end of the inductor L2 and the input end of the second relay K1. This is because the capacitance after rectification of the LED control circuit 20 is much smaller than the capacitance after rectification of the fan control circuit 10, and it can more quickly reflect the disconnection or closing of the mains input. Therefore, the input signal sampling circuit 40 is used to sample the mains input disconnection (generally low level) or closing (generally high level) signal to control the relevant functions of the fan light.

[0049] Of course, in other embodiments, the input signal sampling circuit 40 may not be provided. In this case, a new rectifier and filter circuit may be selected for sampling, which can also quickly reflect the disconnection or closing of the mains input.

[0050] Optionally, the control circuit of the present invention also includes an external module control interface 50 for inserting an external module. This external module can be a plasma, negative ion, or other module requiring mains power. A third relay K2 is connected between the main control circuit 30 and the external module control interface 50. The main control circuit 30 can generate a KZ04 signal to control the third relay K2 to close or open, thereby powering the external module on or off.

[0051] The main control circuit 30 can also receive the remote control signal KZ07 and identify the remote control signal KZ07 so as to issue relevant instructions for control.

[0052] Optionally, the control circuit of the present invention further includes a low-voltage power supply circuit 60. The input end of the low-voltage power supply circuit 60 is respectively connected to the output end of the first filter and rectifier circuit 11 and the output end of the boost circuit 22, and is powered by the first filter and rectifier circuit 11 and the boost circuit 22. The output end of the low-voltage power supply circuit 60 is connected to the main control circuit 30, and is powered by the main control circuit 30. Specifically, the direct current outputted from the output end of the first filter and rectifier circuit 11 is defined as the first direct current VDC, and the direct current outputted from the output end of the boost circuit 22 is defined as the second direct current VC. The first direct current VDC is transmitted to the input end of the low-voltage power supply circuit 60 via a diode D5. The second direct current VC is transmitted to the input end of the low-voltage power supply circuit 60 via a diode D6. The diodes D5 and D6 form an OR gate circuit, which can solve the problem of the low-voltage power supply circuit 60 affecting the lamp harmonics and causing them to fail to meet standards.

[0053] For example, when the LED is lit, the second relay K1 is closed, the second DC voltage VC is greater than the first DC voltage VDC, diode D6 is turned on, and diode D5 is turned off. At this time, the input of the low-voltage power supply circuit 60 is connected to the second DC voltage VC, and the low-voltage power supply circuit 60 does not affect the lamp harmonics. When the LED is in standby mode, the second relay K1 is opened, the second DC voltage VC = 0V, diode D6 is turned off, and diode D5 is turned on. At this time, the input of the low-voltage power supply circuit 60 is connected to the first DC voltage VDC, which maintains the normal operation of the main control circuit 30.

[0054] Of course, to achieve low standby power consumption for the fan light, the low-voltage power supply circuit 60 itself must also be low-power. This ensures truly low power consumption when the low-voltage power supply circuit 60 supplies power to the main control circuit 30 and other related low-voltage circuits (such as the first relay K3, the second relay K1, and the third relay K2). For example, when the fan light is in standby mode, the low-voltage power supply circuit 60 maintains normal operation of the main control circuit 30, resulting in low power consumption for the main control circuit 30.

[0055] like Figure 2As shown in FIG. 1 , it is a timing logic diagram of the I / O port of the main control circuit 30, defining a high level as valid. As can be seen from the figure:

[0056] 1) When powered on, the DAC is at a high level, the main control circuit 30 controls KZ03 to be at a high level, the second relay K1 is closed, and the boost circuit 22 works; after a certain delay (the purpose of the delay is to allow the boost circuit 22 to work first to ensure that the LED light does not flicker when it starts), KZ01 and KZ02 are controlled to be high levels, the first constant current circuit 23 and the second constant current circuit 24 work, and the LED light turns on.

[0057] 2) The remote control sends a fan-on signal, the main control circuit 30 controls KZ04 and KZ05 to high level, delays for a certain time (the purpose of the delay is to make the constant voltage power supply circuit 13 work first and establish normal working voltage), and then controls KZ06 to output PWM, and the fan starts.

[0058] 3) The remote controller sends a fan-off signal, and the main control circuit 30 controls KZ04, KZ05, and KZ06 to a low level, and the fan stops working.

[0059] 4) The remote controller sends a light-off signal, and the main control circuit 30 controls KZ01 and KZ02 to be low level. After a certain delay, it controls KZ03 to be low level to turn off the light.

[0060] 5) After the fan and LED light are turned on, the main control circuit 30 controls KZ01, KZ02, KZ03, KZ04, KZ05, and KZ06 to be low level, and the entire control circuit is powered off.

[0061] It should be noted that: Figure 2 The timing logic diagram shown is made based on the connection of the external module. When the external module is not needed, the main control circuit 30 can control KZ04 to maintain a low level. The high / low level state of KZ04 is not limited here.

[0062] like Figure 3 FIG. 1 is a circuit diagram of a second embodiment of the control circuit of the present utility model. Figure 1 Compared to the first embodiment shown, the only difference between the two is that in the second embodiment, the main control circuit and motor drive circuit 12 are integrated into a single circuit, and the first relay K3 is normally closed. In other words, when the motor drive circuit 12 has sufficient resources, it can replace the main control circuit to perform the corresponding function. In this case, the LED control circuit 20 can achieve self-powered IC power supply by using only the second relay K1, thus minimizing power consumption.

[0063] like Figure 4 FIG. 1 is a circuit diagram of a third embodiment of the control circuit of the present utility model. Figure 1Compared to the first embodiment shown, the only difference between the two is that in the third embodiment, the main control circuit 30 serves as a control signal input interface for an external control module. The external control module may include one or more of a temperature detection module, a humidity detection module, a PM2.5 detection module, a wireless communication module, a display module, a voice module, and a wireless remote control module. Thus, the control circuit of the present invention can simultaneously implement functions such as temperature detection, humidity detection, PM2.5 detection, wireless communication, data display, voice broadcast, and wireless remote control.

[0064] In summary, the control circuit of the present invention connects the main control circuit 30 to the fan control circuit 10 and the LED control circuit 20, and specifically to the constant voltage power supply circuit 13, the motor drive circuit 12, and the boost circuit 22. This allows the main control circuit 30 to control the rotation of the fan and adjust the brightness of the LED. It can also stop the fan or LED as needed, thereby reducing power consumption. Furthermore, by providing a first relay K3 on the first filter and rectifier circuit 11 and a second relay K1 on the second filter and rectifier circuit 21, the main control circuit 30 can control the on / off of the first and second relays K3 and K1, further reducing power consumption.

[0065] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A control circuit, characterized in that: include: The fan control circuit (10) comprises a first filtering and rectifying circuit (11) and a motor driving circuit (12), wherein the first filtering and rectifying circuit (11) is used to convert alternating current into direct current and supply the direct current to the motor driving circuit (12), and the motor driving circuit (12) drives the fan to rotate; The LED control circuit (20) comprises a second filtering and rectifying circuit (21), a boosting circuit (22) and a constant current circuit connected in sequence, wherein the second filtering and rectifying circuit (21) is used to convert alternating current into direct current and supply the direct current to the boosting circuit (22), the boosting circuit (22) boosts the direct current and supplies the direct current to the constant current circuit, and the constant current circuit outputs a constant current to supply the LED; A main control circuit (30) is connected to the fan control circuit (10) and the LED control circuit (20) respectively, and is used to control the working states of the fan and the LED; as well as The relay comprises a first relay connected to a first filtering and rectifying circuit (11) and a second relay connected to a second filtering and rectifying circuit (21), wherein the first relay and the second relay are electrically connected to the main control circuit (30), and the main control circuit (30) controls the on and off of the first relay and the second relay.

2. The control circuit according to claim 1, wherein: The fan control circuit (10) further comprises a constant voltage power supply circuit (13), wherein an input end of the constant voltage power supply circuit (13) is connected to an output end of the first filtering and rectifying circuit (11) for receiving high voltage direct current output by the first filtering and rectifying circuit (11), and an output end of the constant voltage power supply circuit (13) is connected to an input end of the motor driving circuit (12) for providing low voltage direct current to the motor driving circuit (12).

3. The control circuit according to claim 2, wherein: The main control circuit (30) is connected to at least one of the motor drive circuit (12) and the constant voltage power supply circuit (13).

4. The control circuit according to claim 1, wherein: The main control circuit (30) is connected to at least one of the boost circuit (22) and the constant current circuit.

5. The control circuit according to claim 1, wherein: The control circuit further comprises an EMI filter circuit, the input end of the EMI filter circuit being connected to the mains power, and the output end of the EMI filter circuit being respectively connected to the input end of the first filter rectifier circuit (11) and the input end of the second filter rectifier circuit (21).

6. The control circuit according to claim 1, wherein: The invention also includes a low-voltage power supply circuit (60), wherein the input end of the low-voltage power supply circuit (60) is respectively connected to the output end of the first filtering and rectifying circuit (11) and the output end of the boost circuit (22), and the output end of the low-voltage power supply circuit (60) is connected to the main control circuit (30).

7. The control circuit according to claim 6, wherein: The output end of the first filtering and rectifying circuit (11) outputs a first direct current, which is transmitted to the input end of the low-voltage power supply circuit (60) via a diode D5. The output end of the boost circuit (22) outputs a second direct current, which is transmitted to the input end of the low-voltage power supply circuit (60) via a diode D6. The diode D5 and the diode D6 form an OR gate circuit.

8. The control circuit according to claim 1, wherein: The invention also includes an input signal sampling circuit (40), wherein the input end of the input signal sampling circuit (40) is connected to the second filtering and rectifying circuit (21), and the output end is connected to the main control circuit (30), and the input end of the input signal sampling circuit (40) is connected between the output end of the second filtering and rectifying circuit (21) and the input end of the second relay, so as to sample the voltage before flowing into the second relay.

9. The control circuit according to claim 1, wherein: The main control circuit (30) and the motor drive circuit (12) are integrated into the same circuit, and the first relay is in a normally closed state.

10. The control circuit according to claim 1, wherein: The main control circuit (30) is a control signal input interface of an external control module, and the external control module includes one or more of a temperature detection module, a humidity detection module, a PM2.5 detection module, a wireless communication module, a display module, a voice module, and a wireless remote control module.

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