Control circuit

Abstract

Provided in the present invention is a control circuit, comprising: a fan driving circuit, which is used for driving rotation of a fan, and comprises a first filtering and rectification circuit, the first filtering and rectification circuit being used for converting an alternating current into a direct current; an LED driving circuit, which is used for driving a LED, and comprises a second filtering and rectification circuit, the second filtering and rectification circuit being used for converting an alternating current into a direct current; a main control circuit, which is separately connected to the fan driving circuit and the LED driving circuit; a first relay, which is connected to the first filtering and rectification circuit; and a second relay, which is connected to the second filtering and rectification circuit, wherein both the first relay and the second relay are electrically connected to the main control circuit, and the main control circuit controls the operating states of the first relay and the second relay, so as to control the operating states of the fan and the LED. Compared with the prior art, the control circuit of the present invention can, according to actual needs, control the related circuits to stop operating, thus achieving low power consumption.

Description

control circuit

[0001] Cross-references to related applications

[0002] This application claims priority to Chinese Patent Application No. 202411546289.7, filed on October 31, 2024, entitled "Control Circuit", and to Chinese Patent Application No. 202422656475.8, filed on October 31, 2024, entitled "Control Circuit", the entire contents of which are incorporated herein by reference. Technical Field

[0003] This invention relates to a control circuit, mainly used in fan lights, cooling fans, bathroom heaters, and air purifying lights, and belongs to the field of automatic control technology. Background Technology

[0004] Fan lights, cooling fans, bathroom heaters, and air purifying lights are widely used in various technical fields because they combine fan and lighting functions.

[0005] In existing technologies, the control circuits for fan lights, cooling fans, bathroom heaters, and air purifying lights all consist of separate fan drive circuits, LED drive circuits, and main control circuits. While this can meet general usage requirements, this design not only significantly increases the cost of the driver but also leads to excessive standby power consumption due to the large number of circuits, failing to meet the Level 1 energy efficiency requirements or the low standby power consumption requirements of European ERP standards for fan lights, cooling fans, bathroom heaters, and air purifying lights.

[0006] In view of this, it is indeed necessary to improve the existing control circuit to solve the above problems. Summary of the Invention

[0007] The purpose of this invention is to provide a control circuit that can control related circuits to stop working according to actual needs, thereby achieving low power consumption.

[0008] To achieve the above objectives, the present invention provides a control circuit, comprising:

[0009] A fan drive circuit for driving a fan to rotate includes a first filter and rectifier circuit for converting alternating current (AC) into direct current (DC).

[0010] LED driver circuit for driving LEDs, including a second filter and rectifier circuit for converting AC power into DC power;

[0011] The main control circuit is connected to the fan drive circuit and the LED drive circuit respectively; and

[0012] The first relay is connected to the first filter and rectifier circuit;

[0013] The second relay is connected to the second filter and rectifier circuit;

[0014] Both the first and second relays are electrically connected to the main control circuit, which controls their operating states, thereby controlling the operation of the fan and LED. This allows the main control circuit to either stop the fan or LED from operating, reducing power consumption, or to control the on / off state of the first and second relays, further reducing power consumption.

[0015] Optionally, the fan drive circuit also includes a motor drive circuit and a power regulation circuit. The input terminal of the power regulation circuit is connected to the output terminal of the first filter and rectifier circuit to receive the high-voltage DC power output by the first filter and rectifier circuit. The output terminal of the power regulation circuit is connected to the input terminal of the motor drive circuit to provide low-voltage DC power to the motor drive circuit, which then drives the fan to rotate.

[0016] Optionally, the main control circuit is connected to at least one of the motor drive circuit and the power regulation circuit. In this way, the main control circuit can control at least one of the motor drive circuit and the power regulation circuit to stop operating, causing the fan to stop rotating and reducing power consumption.

[0017] Optionally, the LED driver circuit also includes a boost circuit and a constant current circuit. The input terminal of the boost circuit is connected to the output terminal of the second filter and rectifier circuit to receive the DC power output from the second filter and rectifier circuit, boost it, and then supply it to the constant current circuit. The constant current circuit outputs a constant current to supply the LED. 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 control at least one of the boost circuit and the constant current circuit to stop working, thus turning off the LED and reducing power consumption.

[0018] Optionally, the control circuit also includes an EMI filter circuit. The input terminal of the EMI filter circuit is connected to the mains power, and the output terminal is connected to the input terminals of the first filter rectifier circuit and the second filter rectifier circuit, respectively. In this way, it serves to filter and process interference from the mains power.

[0019] Optionally, the control circuit also includes a low-voltage power supply circuit. The input terminals of the low-voltage power supply circuit are connected to the output terminals of the first filter and rectifier circuit and the boost circuit, respectively, receiving DC power from either the first filter and rectifier circuit or the boost circuit. The output terminal 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 characteristics of the low-voltage power supply circuit itself can be utilized to achieve low standby power consumption for the fan light, realizing true low power consumption.

[0020] Optionally, the output of the first filter rectifier circuit outputs a first DC current, 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 current, 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. In this way, the problem of the low-voltage power supply circuit affecting lamp harmonics and causing them to not meet standards can be solved.

[0021] Optionally, the control circuit also includes an input signal sampling circuit, which is connected between the second filter and rectifier circuit and the main control circuit. The input signal sampling circuit is used to sample the voltage output by the second filter and rectifier circuit and output it to the main control circuit.

[0022] Optionally, the input terminal of the input signal sampling circuit is connected to the second filter and rectifier circuit, and the output terminal is connected to the main control circuit. Furthermore, the input terminal of the input signal sampling circuit is connected between the output terminal of the second filter and rectifier circuit and the input terminal of the second relay, sampling the voltage before it flows into the second relay. This allows for rapid response to whether the mains input is open or closed.

[0023] Optionally, the main control circuit and the motor drive circuit can be integrated into the same circuit.

[0024] 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 drive circuit and the LED drive circuit respectively, so that the main control circuit can be used to control the working state of the fan and the LED, and can control the fan or the LED to stop working according to actual needs, thereby reducing power consumption; on the other hand, by setting a first relay on the first filter rectifier circuit and a second relay on the second filter rectifier 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. Attached Figure Description

[0025] Figure 1 is a circuit diagram of a control circuit according to a preferred embodiment of the present invention.

[0026] Figure 2 is the I / O port timing logic diagram of the main control circuit in Figure 1.

[0027] Figure 3 is a circuit diagram of a second embodiment of the control circuit of the present invention.

[0028] Figure 4 is a circuit diagram of the third embodiment of the control circuit of the present invention.

[0029] Reference numerals: 10-Fan drive circuit, 11-First filter and rectifier circuit, B1-First bridge rectifier circuit, 12-Motor drive circuit, 13-Power supply regulation circuit, K3-First relay; 20-LED drive circuit, 21-Second filter and rectifier circuit, B2-Second bridge rectifier circuit, 22-Boost circuit, 23-First constant current circuit, 24-Second constant current circuit, K1-Second relay; 30-Main control circuit, 40-Input signal sampling circuit, 50-External module control interface, K2-Third relay, 60-Low voltage power supply circuit. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] As shown in Figure 1, this invention discloses a control circuit, mainly applied to appliances such as fan lights, cooling fans, bathroom heaters, and air purifying lights that simultaneously have fans and LEDs, to control fan rotation and LED on / off states, while achieving low power consumption. Because the control circuit of this invention has many applications, the following description will use a fan light as an example to provide a detailed explanation of the specific structure and working principle of the control circuit.

[0032] The control circuit mainly includes a fan drive circuit 10, an LED drive circuit 20, a main control circuit 30, and a relay. The main control circuit 30 is connected to both the fan drive circuit 10 and the LED drive circuit 20, thereby controlling the operating status of the fan and the LED and achieving low power consumption.

[0033] The fan drive circuit 10 includes a first filter and rectifier circuit 11, a power regulation circuit 13, and a motor drive circuit 12. The first filter and rectifier circuit 11 is connected to the AC mains power supply and converts the AC mains power into high-voltage DC power VD, which is then supplied to the power regulation circuit 13. The power regulation circuit 13 converts the high-voltage DC power VD into low-voltage DC power DC, which is then supplied to the motor drive circuit 12. The motor drive circuit 12 then converts the DC power VD into three-phase AC power for the fan motor, which drives the fan to rotate. In this embodiment, the fan motor is a brushless DC motor. Alternatively, in other embodiments, the power regulation circuit 13 may be omitted, in which case the high-voltage DC power VD is directly supplied to the motor drive circuit 12 by the first filter and rectifier circuit 11, achieving high-voltage drive.

[0034] It should be noted that the power supply regulation circuit 13 here can be a constant voltage source circuit. It can not only receive the high voltage DC VD output by the first filter rectifier circuit 11, but also use its own regulating element to regulate the high voltage DC VD to output a constant low voltage DC. Here, "constant" refers to a pre-set constant voltage value, which can be determined according to the signal received by the regulating element. No restrictions are imposed here.

[0035] Specifically, the first filter rectifier circuit 11 includes a first bridge rectifier circuit B1 and a first filter circuit connected to the first bridge rectifier circuit B1. The first bridge rectifier circuit B1 consists of four diodes D1 to D4, used to rectify AC power into DC power. The first filter circuit is a first π-type filter circuit composed of capacitor C1, inductor L1, and capacitor C2. The two ends of the first π-type filter circuit are respectively connected to the two output terminals of the first bridge rectifier circuit B1, used to filter out the 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.

[0036] The input terminal of the power supply regulating circuit 13 is connected to the output terminal of the first filter circuit, used to receive the high-voltage DC power VD after passing through the first filter circuit, and reduce the high-voltage DC power VD to low-voltage DC power. The output terminal of the power supply regulating circuit 13 is connected to the input terminal of the motor drive circuit 12, used to provide the low-voltage DC power to the motor drive circuit 12. After receiving the low-voltage DC power, the motor drive circuit 12 converts it into three-phase AC power for the fan motor, which drives the fan to rotate. Optionally, the specific circuits of the power supply regulating circuit 13 and the motor drive circuit 12 can adopt existing technical solutions, which are not limited here.

[0037] The LED driver circuit 20 includes a second filter and rectifier circuit 21, a boost circuit 22, and a constant current circuit connected in sequence. The second filter and rectifier circuit 21 converts AC power into DC power. The input terminal of the boost circuit 22 is connected to the output terminal of the second filter and rectifier circuit 21, receiving the DC power output from the second filter and rectifier circuit 21, boosting it, and then supplying it to the constant current circuit. The constant current circuit outputs a constant current to supply the LED.

[0038] Specifically, the second filter rectifier circuit 21 includes a second bridge rectifier circuit B2 and a second filter circuit connected to the second bridge rectifier circuit B2. The second bridge rectifier circuit B2 consists of four diodes D7 to D10, used to rectify AC power into DC power. The second filter circuit is a second π-type filter circuit composed of capacitor C3, inductor L2, and capacitor C4. The two ends of this second π-type filter circuit are respectively connected to the two output terminals of the second bridge rectifier circuit B2, used to filter out the ripple in the DC power output of the second bridge rectifier circuit B2, thereby reducing the ripple coefficient of the output DC power and making the waveform smoother.

[0039] Optionally, the boost circuit 22 is an APFC circuit, i.e., an active power factor correction circuit, used to receive the high-voltage DC power after the second filter circuit and boost it to obtain DC power VC. The function of the APFC circuit is to reduce the harmonics generated by rectification and filtering, thereby obtaining a higher power factor that meets the harmonic requirements of GB17625.1. After boosting, the DC power VC is greater than the high-voltage DC power VD.

[0040] In this embodiment, the fan drive circuit 10 does not have an APFC circuit because fans are electrical appliances, and harmonic-related requirements are typically only in place when the input power is greater than 75W. Since the input power of a fan is generally less than 50W, the national standard requires that there are no harmonic requirements for input power ≤75W. However, lighting power greater than 5W has harmonic requirements, and an APFC circuit is required when the lighting power is greater than 25W to meet the relevant requirements.

[0041] Optionally, the constant current circuit is configured with two paths: a first constant current circuit 23 and a second constant current circuit 24. A DC current VC is supplied to both the first and second constant current circuits, which then output a constant current to the LED to control its illumination. The specific circuitry of the first and second constant current circuits 23 and 24 can utilize existing technologies and is not limited here. Of course, a third or more constant current circuits can also be configured, all controlled by the main control circuit 30 as needed; the specific number of constant current circuits is not limited here.

[0042] Optionally, the control circuit also includes a fuse F connected to the AC mains power and an EMI filter circuit connected to the fuse F. The fuse F is connected to the live wire (L wire) of the AC mains power and is also called a current fuse. When the current abnormally rises to a certain level and temperature, the fuse F can melt and cut off the current, thereby protecting the control circuit for safe operation. The input terminal of the EMI filter circuit is connected to the AC mains power to process interference. The output terminal of the EMI filter circuit is connected to the input terminals of the first filter rectifier circuit 11 and the second filter rectifier circuit 21, respectively. That is, the fan drive circuit 10 and the LED drive circuit 20 of this invention are integrated into one unit, sharing a single EMI filter circuit.

[0043] The relays include a first relay K3 connected to the first filter rectifier circuit 11 and a second relay K1 connected to the second filter rectifier circuit 21. Both the first relay K3 and the second relay K1 are electrically connected to the main control circuit 30, and the main control circuit 30 controls the working state (i.e., on / off) of the first relay K3 and the second relay K1, thereby controlling the working state of the fan and the LED.

[0044] Specifically, one end of the first relay K3 is connected between inductor L1 and capacitor C2, and the other end is connected to the main control circuit 30. To clearly illustrate the voltage difference before and after the first relay K3, VDC represents the voltage before the first relay K3 in Figure 1, and VD represents the voltage after the first relay K3. When the first relay K3 is open, the power supply regulation circuit 13 and the motor drive circuit 12 stop working, and VD = 0V, while VDC is the voltage after rectification and filtering of the mains power. When the first relay K3 is closed, the fan drive circuit 10 is turned on, and the power supply regulation circuit 13 and the motor drive circuit 12 operate normally, and VDC = VD.

[0045] One end of the second relay K1 is connected between inductor L2 and capacitor C4, and the other end is connected to the main control circuit 30. When the second relay K1 is open, the boost circuit 22, the first constant current circuit 23, and the second constant current circuit 24 stop working, the DC current VC = 0V, and the LED is off. When the second relay K1 is closed, the LED driver circuit 20 is turned on, the boost circuit 22, the first constant current circuit 23, and the second constant current circuit 24 work normally, and the LED lights up.

[0046] The main control circuit 30 is connected to both the fan drive circuit 10 and the LED drive circuit 20, thereby controlling the fan rotation and adjusting the LED brightness to achieve low power consumption. Specifically, the main control circuit 30 is connected to at least one of the motor drive circuit 12 and the power regulation circuit 13, allowing it to stop operating at least one of these circuits as needed, thus 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, allowing it to stop operating at least one of these circuits as needed, further reducing power consumption.

[0047] In this embodiment, the main control circuit 30 is connected to both the motor drive circuit 12 and the power regulation circuit 13. The main control circuit 30 can send a KZ05 signal to the power regulation circuit 13 to control the operation or shutdown of both the power regulation circuit 13 and the motor drive circuit 12, thereby reducing standby power consumption. Alternatively, the power regulation circuit 13 and the motor drive circuit 12 can 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 fan motor's speed, shutdown, and forward / reverse rotation. For example, a fixed-frequency PWM signal can be used to control the fan motor's speed and rotation, while a signal outside the fixed-frequency range can be used to stop the fan motor.

[0048] 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. The main control circuit 30 can send a KZ01 signal to the second constant current circuit 24 to control the output current and stop its operation. The main control circuit 30 can also send a KZ02 signal to the first constant current circuit 23 to control the output current and stop its 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, resulting in no power consumption and achieving the goal of reducing power consumption.

[0049] 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, the standby power consumption can only be reduced appropriately. This is because the boost circuit 22, the first constant current circuit 23, and the second constant current circuit 24 have some internal resistance, which will still generate some power consumption, but the power consumption at this time is relatively low.

[0050] Optionally, the control circuit of the present invention further includes an input signal sampling circuit 40 connected between the second filter rectifier circuit 21 and the main control circuit 30, used to sample the voltage output by the second filter rectifier circuit 21 and output it to the main control circuit 30. Preferably, the input terminal of the input signal sampling circuit 40 is connected to the second filter rectifier circuit 21, and the output terminal is connected to the main control circuit 30. The input terminal of the input signal sampling circuit 40 is also connected between the output terminal of the second filter rectifier circuit 21 and the input terminal of the second relay K1, performing DAC sampling on the voltage before it flows into the second relay K1. More specifically, the input terminal of the input signal sampling circuit 40 is connected between the output terminal of the inductor L2 and the input terminal of the second relay K1. This is because the capacitance after rectification by the LED driver circuit 20 is much smaller than the capacitance after rectification by the fan driver circuit 10, and can more quickly reflect the status of the mains input being open or closed. Therefore, the input signal sampling circuit 40 samples the mains input open (generally low level) or closed (generally high level) signal to control the relevant functions of the fan light.

[0051] Of course, in other embodiments, the input signal sampling circuit 40 may not be provided. In this case, a new rectifier and filter circuit can be used for sampling, which can also quickly reflect the situation of the mains input being disconnected or closed.

[0052] Optionally, the control circuit of the present invention also provides an external module control interface 50 for inserting an external module. The external module can be a plasma, negative ion, or other module that requires connection to 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 send a KZ04 signal to control the third relay K2 to close or open, thereby energizing or de-energizing the external module.

[0053] The main control circuit 30 can also receive the remote control signal KZ07 and identify the remote control signal KZ07 in order to issue relevant commands for control.

[0054] Optionally, the control circuit of the present invention further includes a low-voltage power supply circuit 60. The input terminal of the low-voltage power supply circuit 60 is connected to the output terminal of the first filter rectifier circuit 11 and the output terminal of the boost circuit 22, respectively, receiving the DC power output from either the first filter rectifier circuit 11 or the boost circuit 22, and being powered by one of them. The output terminal of the low-voltage power supply circuit 60 is connected to the main control circuit 30, supplying power to the main control circuit 30. Specifically, the DC power output from the output terminal of the first filter rectifier circuit 11 is defined as the first DC power VDC, and the DC power output from the output terminal of the boost circuit 22 is defined as the second DC power VC. The first DC power VDC is transmitted to the input terminal of the low-voltage power supply circuit 60 via diode D5. The second DC power VC is transmitted to the input terminal of the low-voltage power supply circuit 60 via diode D6. Diodes D5 and D6 form an OR gate circuit, which can solve the problem of the low-voltage power supply circuit 60 affecting lamp harmonics and failing to meet standards.

[0055] For example, when the LED is lit, the second relay K1 is closed, the second DC current VC > the first DC current VDC, diode D6 conducts, and diode D5 is cut off. At this time, the input terminal of the low-voltage power supply circuit 60 is connected to the second DC current 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 open, the second DC current VC = 0V, diode D6 is cut off, and diode D5 conducts. At this time, the input terminal of the low-voltage power supply circuit 60 is connected to the first DC current VDC, which maintains the normal operation of the main control circuit 30.

[0056] Of course, in order for the fan light to achieve low standby power consumption, the low-voltage power supply circuit 60 itself must also have low power consumption characteristics. Only then can true low power consumption be achieved 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 the normal operation of the main control circuit 30, at which time the power consumption of the main control circuit 30 is low.

[0057] Figure 2 shows the I / O port timing logic diagram of the main control circuit 30, defined as active high. From this figure, we can see that:

[0058] 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 is working; after a certain delay (the purpose of the delay is to allow the boost circuit 22 to work first, so that the LED will not flicker when it starts), KZ01 and KZ02 are both controlled to be at a high level, the first constant current circuit 23 and the second constant current circuit 24 are working, and the LED lights up.

[0059] 2) When the remote control sends a signal to turn on the fan, the main control circuit 30 controls KZ04 and KZ05 to be at a high level. After a certain delay (the purpose of the delay is to allow the power regulation circuit 13 to work first and establish the normal working voltage), it controls KZ06 to output PWM, and the fan starts working.

[0060] 3) When the remote control sends a signal to turn off the fan, the main control circuit 30 controls KZ04, KZ05, and KZ06 to be at a low level, and the fan stops working.

[0061] 4) When the remote control sends a signal to turn off the lights, the main control circuit 30 controls KZ01 and KZ02 to be at a low level. After a certain delay, it controls KZ03 to be at a low level, thus turning off the lights.

[0062] 5) After the fan and LED lights are turned on, the main control circuit 30 controls KZ01, KZ02, KZ03, KZ04, KZ05, and KZ06 to be at a low level, and the entire control circuit is powered off.

[0063] It should be noted that the timing logic diagram shown in Figure 2 is based on the connection of external modules. When no external modules are needed, the main control circuit 30 can control KZ04 to remain at a low level. No restrictions are placed on the high / low level states of KZ04 here.

[0064] Figure 3 shows a circuit diagram of the second embodiment of the control circuit of the present invention. Compared with the first embodiment shown in Figure 1, the only difference is that in the second embodiment, the main control circuit and the motor drive circuit 12 are integrated into the same circuit, and the first relay K3 is in a normally closed state. In other words, when the motor drive circuit 12 has sufficient resources, it can replace the main control circuit to perform the corresponding functions. At this time, because the first constant current circuit 23 and the second constant current circuit 24 can achieve IC self-powering, the LED drive circuit 20 can minimize power consumption using only the second relay K1.

[0065] Figure 4 shows a circuit diagram of the third embodiment of the control circuit of the present invention. Compared with the first embodiment shown in Figure 1, the only difference is that in the third embodiment, the main control circuit 30 is a control signal input interface for an external control module. The external control module includes one or more of the following: 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 realize functions such as temperature detection, humidity detection, PM2.5 detection, wireless communication, data display, voice broadcasting, and wireless remote control.

[0066] In summary, the control circuit of the present invention, on the one hand, connects the main control circuit 30 to the fan drive circuit 10 and the LED drive circuit 20 respectively, and specifically to the power regulation circuit 13, the motor drive circuit 12, and the boost circuit 22. This allows the main control circuit 30 to control the fan rotation and adjust the LED's brightness, and can also control the fan or LED to stop working as needed, reducing power consumption. On the other hand, by setting a first relay K3 on the first filter rectifier circuit 11 and a second relay K1 on the second filter rectifier circuit 21, the main control circuit 30 can control the on / off state of the first relay K3 and the second relay K1, further reducing power consumption.

[0067] It should be noted that the fan drive circuit in any of the above embodiments is also called a fan control circuit, the LED drive circuit is also called an LED control circuit, and the power supply regulation circuit is also called a constant voltage power supply circuit.

[0068] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A control circuit, wherein, include: A fan drive circuit (10) is used to drive the fan to rotate, including a first filter rectifier circuit (11) for converting AC power into DC power. LED driving circuit (20) for driving LED, including a second filter rectifier circuit (21) for converting AC power into DC power; The main control circuit (30) is connected to the fan drive circuit (10) and the LED drive circuit (20) respectively; and The first relay is connected to the first filter rectifier circuit (11); The second relay is connected to the second filter rectifier circuit (21); The first relay and the second relay are electrically connected to the main control circuit (30), and the main control circuit (30) controls the working state of the first relay and the second relay, thereby controlling the working state of the fan and the LED.

2. The control circuit according to claim 1, wherein: The fan drive circuit (10) further includes a motor drive circuit (12) and a power regulation circuit (13). The input terminal of the power regulation circuit (13) is connected to the output terminal of the first filter rectifier circuit (11) to receive the high voltage DC power output by the first filter rectifier circuit (11). The output terminal of the power regulation circuit (13) is connected to the input terminal of the motor drive circuit (12) to provide low voltage DC power to the motor drive circuit (12), which drives the fan to rotate.

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 power regulation circuit (13).

4. The control circuit according to claim 1, wherein: The LED driving circuit (20) further includes a boost circuit (22) and a constant current circuit. The input terminal of the boost circuit (22) is connected to the output terminal of the second filter rectifier circuit (21) to receive the DC power output by the second filter rectifier circuit (21), boost it, and supply it to the constant current circuit. The constant current circuit outputs a constant current to supply the LED. 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 also includes an EMI filter circuit, the input of which is connected to the mains power, and the output of which is connected to the input of the first filter rectifier circuit (11) and the input of the second filter rectifier circuit (21), respectively.

6. The control circuit according to claim 4, wherein: It also includes a low-voltage power supply circuit (60), the input terminal of which is connected to the output terminal of the first filter rectifier circuit (11) and the output terminal of the boost circuit (22) respectively, to receive the DC power output by the first filter rectifier circuit (11) or the boost circuit (22), and the output terminal of the low-voltage power supply circuit (60) is connected to the main control circuit (30) to supply power to the main control circuit (30).

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

8. The control circuit according to claim 1, wherein: It also includes an input signal sampling circuit (40), which is connected between the second filter rectifier circuit (21) and the main control circuit (30) to sample the voltage output by the second filter rectifier circuit (21) and output it to the main control circuit (30).

9. The control circuit according to claim 8, wherein: The input terminal of the input signal sampling circuit (40) is connected to the second filter rectifier circuit (21), and the output terminal is connected to the main control circuit (30). The input terminal of the input signal sampling circuit (40) is connected between the output terminal of the second filter rectifier circuit (21) and the input terminal of the second relay to sample the voltage before it flows into the second relay.

10. The control circuit according to claim 2, wherein: The main control circuit (30) and the motor drive circuit (12) are integrated in the same circuit.

11. A control circuit, wherein, include: The fan control circuit (10) includes a first filter rectifier circuit (11) and a motor drive circuit (12). The first filter rectifier circuit (11) is used to convert AC power into DC power and supply it to the motor drive circuit (12), which drives the fan to rotate. The LED control circuit (20) includes a second filter rectifier circuit (21), a boost circuit (22) and a constant current circuit connected in sequence. The second filter rectifier circuit (21) is used to convert AC power into DC power and supply it to the boost circuit (22). After being boosted by the boost circuit (22), it is supplied to the constant current circuit, and then the constant current circuit outputs a constant current to supply the LED. The 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 state of the fan and the LED; as well as The relay includes a first relay connected to the first filter rectifier circuit (11) and a second relay connected to the second filter rectifier circuit (21). 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.

12. The control circuit according to claim 11, wherein: The fan control circuit (10) further includes a constant voltage power supply circuit (13). The input terminal of the constant voltage power supply circuit (13) is connected to the output terminal of the first filter rectifier circuit (11) to receive the high voltage DC power output by the first filter rectifier circuit (11). The output terminal of the constant voltage power supply circuit (13) is connected to the input terminal of the motor drive circuit (12) to provide low voltage DC power to the motor drive circuit (12).

13. The control circuit according to claim 12, 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).

14. The control circuit according to claim 11, wherein: The main control circuit (30) is connected to at least one of the boost circuit (22) and the constant current circuit.

15. The control circuit according to claim 11, wherein: The control circuit also includes an EMI filter circuit, the input of which is connected to the mains power, and the output of which is connected to the input of the first filter rectifier circuit (11) and the input of the second filter rectifier circuit (21), respectively.

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