Fan light control circuit, fan light system and control method thereof

Abstract

The application discloses a fan lamp control circuit, a fan lamp system and a control method thereof, wherein the fan lamp control circuit comprises a motor control circuit and a lamp plate auxiliary power supply circuit. A first input end of the motor control circuit is used to be coupled with a first end of an alternating current power supply, a second input end of the motor control circuit is used to be coupled with a second end of the alternating current power supply, a first output end of the motor control circuit is used to be coupled with a first end of a motor, and a second output end of the motor control circuit is used to be coupled with a second end of the motor. The motor control circuit is used to convert alternating current of the alternating current power supply into chopped alternating current and then load the chopped alternating current to the motor to drive the motor to work. The lamp plate auxiliary power supply circuit is used to cooperate with the motor control circuit to control on-off states of a power supply loop where the lamp plate is located. The application can make a single-phase induction motor stepless electronic speed regulator compatible with current "two-in-three-out" fan lamp controller wiring, and the motor and the lamp plate can be independently controlled.

Description

Technical Field

[0001] This invention belongs to the field of electronic circuit technology, and relates to a control circuit technology, particularly to a fan light control circuit, a fan light system, and a control method thereof. Background Technology

[0002] Fan lights combine the functions of a fan and lighting, are aesthetically pleasing, and are quite popular in the domestic appliance market. Traditional fans use tap-based speed control, which has limitations such as limited speed settings and low efficiency under light loads, and these drawbacks are becoming increasingly apparent. To address this issue, stepless electronic speed control solutions with high efficiency and high power factor will gradually replace traditional tap-based speed control solutions.

[0003] At the current stage, the traditional fan light controller uses a "two-in, three-out" wiring method. Figure 1 For a wiring diagram of the existing fan light and controller, please refer to... Figure 1 and Figure 2 It can be seen that the fan light remote control 2 has two input terminals, namely the first input terminal 21 and the second input terminal 23, which are connected to the live wire and neutral wire of the mains power, respectively. The fan light remote control 2 has three output terminals, namely the first output terminal 25, the second output terminal 27, and the third output terminal 29. The first output terminal 25 is connected to the lamp panel live wire 41, the second output terminal 27 is connected to the motor live wire 43, and the third output terminal 29 is connected to the fan light's common neutral wire 45. The motor's neutral wire and the lamp's neutral wire are shared; the motor's live wire is connected to the motor, and the lamp panel's live wire is connected to the lamp panel.

[0004] Currently, the fan light market widely adopts Figure 2 This "two-in, three-out" wiring method allows the fan-light controller to independently control the operation of both the fan and the light, and also provides some speed adjustment for the fan. However, ordinary fan-light controllers still use traditional tap-based or thyristor-based speed control. Tap-based speed control is inefficient and cannot provide deep speed adjustment. While thyristor chopper speed controllers solve the problem of wide-range speed adjustment to some extent, the distortion of voltage and current waveforms generates electromagnetic noise. Although bridgeless AC speed control solutions have solved many problems related to single-phase motor efficiency, noise, and speed adjustment, they lack the function of controlling the lights. Furthermore, they are incompatible with existing "two-in, three-out" wiring methods to meet the independent control functions of the fan and light panel.

[0005] In view of this, there is an urgent need to design a new fan light control circuit in order to overcome at least some of the aforementioned defects of existing fan light control circuits. Summary of the Invention

[0006] This invention provides a fan light control circuit, a fan light system, and a control method thereof, which enables a single-phase induction motor stepless electronic speed controller to be compatible with the current "two-input three-output" fan light controller wiring, and allows the motor and the light panel to be controlled independently.

[0007] To solve the above-mentioned technical problems, according to one aspect of the present invention, the following technical solution is adopted:

[0008] One embodiment of the present invention discloses a fan light control circuit, the fan light control circuit comprising:

[0009] A motor control circuit has a first input terminal, a second input terminal, a first output terminal, a second output terminal, and a ground potential terminal. The first and second input terminals are coupled to an AC power supply, and the first and second output terminals are coupled to a motor. The motor control circuit converts the AC power from the AC power supply into chopped AC power and applies it to the motor to drive the motor. The motor control circuit includes a chopper circuit, which comprises two half-bridges.

[0010] The lamp panel auxiliary power supply circuit is used in conjunction with the motor control circuit to control the on / off state of the power supply circuit in which the lamp panel is located; wherein, the first end of the lamp panel auxiliary power supply circuit is coupled to the second input end of the motor control circuit, and the second end of the lamp panel is coupled to the first output end of the motor control circuit; or, the first end of the lamp panel auxiliary power supply circuit is coupled to the first input end of the motor control circuit, and the second end of the lamp panel is coupled to the second output end of the motor control circuit; the second end of the lamp panel auxiliary power supply circuit is coupled to the first end of the lamp panel.

[0011] In one embodiment of the present invention, the auxiliary power supply circuit for the lamp panel includes a fifth switch; the first end of the fifth switch is coupled to the first input terminal or the second input terminal of the motor control circuit, and the second end of the fifth switch is used to couple to the lamp panel.

[0012] In one embodiment of the present invention, the auxiliary power supply circuit for the lamp panel includes a fifth switch and a fifth diode; wherein...

[0013] The anode of the fifth diode is coupled to the first or second input terminal of the motor control circuit, and the cathode of the fifth diode is coupled to the first terminal of the fifth switch. The second terminal of the fifth switch is used to couple to the lamp panel; or, the first terminal of the fifth switch is coupled to the first or second input terminal of the motor control circuit, the second terminal of the fifth switch is coupled to the anode of the fifth diode, and the cathode of the fifth diode is used to couple to the lamp panel.

[0014] As one embodiment of the present invention, the auxiliary power supply circuit for the lamp panel further includes a first capacitor, which is connected in parallel with the lamp panel.

[0015] In one embodiment of the present invention, the chopper circuit includes a first switching transistor, a second switching transistor, a third switching transistor, and a fourth switching transistor; the chopper circuit is used to convert the alternating current from an AC power source into chopped alternating current; and

[0016] The first switch is coupled between the first input terminal and the first output terminal of the motor control circuit; the second switch is coupled between the first output terminal of the motor control circuit and the ground potential terminal; the third switch is coupled between the second input terminal and the second output terminal of the motor control circuit; and the fourth switch is coupled between the second output terminal of the motor control circuit and the ground potential terminal.

[0017] In one embodiment of the present invention, the first end of the lamp panel auxiliary power supply circuit is coupled to the first input end of the motor control circuit, and the second end of the lamp panel is used to couple to the second output end of the motor control circuit; or, the first end of the lamp panel auxiliary power supply circuit is coupled to the second input end of the motor control circuit, and the second end of the lamp panel is used to couple to the first output end of the motor control circuit.

[0018] In one embodiment of the present invention, the first switching transistor includes a first body diode connected in parallel, the anode of the first body diode being coupled to the first output terminal of the motor control circuit, and the cathode of the first body diode being coupled to the first input terminal of the motor control circuit.

[0019] The second switching transistor includes a second body diode connected in parallel, with the anode of the second body diode coupled to the ground potential terminal and the cathode of the second body diode coupled to the first output terminal of the motor control circuit.

[0020] The third switching transistor includes a third-body diode connected in parallel, with the anode of the third-body diode coupled to the second output terminal of the motor control circuit, and the cathode of the third-body diode coupled to the second input terminal of the motor control circuit; and

[0021] The fourth switching transistor includes a fourth body diode connected in parallel. The anode of the fourth body diode is coupled to the ground potential terminal, and the cathode of the fourth body diode is coupled to the second output terminal of the motor control circuit.

[0022] In one embodiment of the present invention, in the first state, the motor and the lamp panel work simultaneously; the lamp panel auxiliary power supply circuit controls the fifth switch to be turned on.

[0023] The motor control circuit controls the switching of the first, second, third, and fourth switching transistors to convert the AC power from the AC power supply into chopped AC power to drive the motor.

[0024] In one embodiment of the present invention, in the second state, the motor is working, the lamp panel is not working, and the lamp panel auxiliary power supply circuit controls the fifth switch to be turned off.

[0025] The motor control circuit controls the switching of the first, second, third, and fourth switching transistors to convert the AC power from the AC power supply into chopped AC power to drive the motor.

[0026] As one embodiment of the present invention, a dead zone period is set in the transition interval between the positive half-cycle and the negative half-cycle of the AC power supply. When the AC power supply is in the dead zone period, the motor control circuit controls the second and fourth switching transistors to turn on, and the first and third switching transistors to turn off.

[0027] When the AC power supply is in the positive half-cycle excluding the dead zone, the motor control circuit controls the third and fourth switching transistors to conduct, the first switching transistor switches with a first duty cycle, and the switching action of the second switching transistor is complementary to that of the first switching transistor; and

[0028] When the AC power supply is in the negative half-cycle excluding the dead zone, the motor control circuit controls the first and second switching transistors to turn on, the third switching transistor to switch with the first duty cycle, and the switching action of the fourth switching transistor is complementary to the switching action of the third switching transistor.

[0029] In one embodiment of the present invention, in the third state, the motor is not working, but the lamp panel is working; the lamp panel auxiliary power supply circuit controls the fifth switch to be turned on; and

[0030] The motor control circuit controls the switching of the first, second, third, and fourth switching transistors to keep the motor in a stopped state.

[0031] In one embodiment of the present invention, in the fourth state, neither the motor nor the lamp panel is working; the lamp panel auxiliary power supply circuit controls the fifth switch to turn off; and

[0032] The motor control circuit controls the switching of the first, second, third, and fourth switching transistors to keep the motor in a stopped state.

[0033] In one embodiment of the present invention, the motor control circuit controls the first and third switching transistors to turn off, and the second and fourth switching transistors to turn on; or, when the AC power supply is in the positive half-cycle, the motor control circuit controls the first switching transistor to turn off, and the second, third and fourth switching transistors to turn on, and when the AC power supply is in the negative half-cycle, the motor control circuit controls the third switching transistor to turn off, and the first, second and fourth switching transistors to turn on.

[0034] One embodiment of the present invention discloses a fan light system, which includes a motor, a light panel, and a fan light control circuit as described above. The first end of the motor is coupled to the first output end of the motor control circuit, and the second end of the motor is coupled to the second output end of the motor control circuit.

[0035] An embodiment of the present invention discloses a control method for a fan light system. The fan light system includes a motor, a lamp panel, and a fan light control circuit. The fan light control circuit includes a motor control circuit and a lamp panel auxiliary power supply circuit. A first end of the lamp panel is coupled to the lamp panel auxiliary power supply circuit, and a second end of the lamp panel is coupled to the motor control circuit. The lamp panel auxiliary power supply circuit includes a fifth switch. The motor control circuit includes a chopper circuit. The chopper circuit is used to convert the AC power from the AC power source into chopped AC power. The chopper circuit includes a first switch, a second switch, a third switch, and a fourth switch. The control method includes:

[0036] The on / off state of the power supply circuit to which the lamp panel is located is controlled by the auxiliary power supply circuit and the motor control circuit, thereby controlling the working state of the lamp panel; and

[0037] The motor control circuit converts the AC power from the AC power source into chopped AC power, which is then applied to the motor to control the motor's operating state.

[0038] As one embodiment of the present invention, the control method further includes:

[0039] In the first state, the motor and the lamp panel work simultaneously; the fifth switch is activated.

[0040] The first, second, third, and fourth switching transistors are switched to convert the AC power from the AC power supply into chopped AC power to drive the motor.

[0041] As one embodiment of the present invention, the control method further includes:

[0042] In the second state, the motor is working, but the lamp panel is not working; the fifth control switch is turned off.

[0043] The first, second, third, and fourth switching transistors are switched to convert the AC power from the AC power supply into chopped AC power to drive the motor.

[0044] As one embodiment of the present invention, the control method further includes:

[0045] In the third state, the motor is not working, but the lamp panel is working; the fifth control switch is turned on; and

[0046] The first, second, third, and fourth switching transistors are switched to keep the motor in a stopped state.

[0047] As one embodiment of the present invention, the control method further includes:

[0048] In the fourth state, neither the motor nor the lamp panel works; the fifth control switch is turned off; and

[0049] The first, second, third, and fourth switching transistors are switched to keep the motor in a stopped state.

[0050] The beneficial effects of this invention are as follows: The fan light control circuit, fan light system, and control method proposed in this invention enable the single-phase induction motor stepless electronic speed controller to be compatible with the current "two-input, three-output" fan light controller wiring. The motor and light panel can be controlled independently, and the motor speed can be deeply steplessly adjusted. In this invention, the rectifier circuit is eliminated between the AC power supply and the motor control circuit, further simplifying the system, reducing the number of passive components, resulting in a smaller size, higher efficiency, and easier integration with higher power modules. This invention effectively reduces system complexity and cost, has a high power factor, and can greatly improve the efficiency of the motor at low speeds while reducing motor noise. Attached Figure Description

[0051] Figure 1 Wiring diagram for existing fan lights and controllers.

[0052] Figure 2 This is a circuit diagram of an existing "two-input, three-output" fan-light system.

[0053] Figure 3 This is a circuit diagram of a fan-light system in one embodiment of the present invention.

[0054] Figure 4 This is a schematic diagram of the lamp panel power supply circuit of the fan lamp system in one state according to an embodiment of the present invention.

[0055] Figure 5 This is a schematic diagram of the lamp panel power supply circuit of the fan lamp system in another state according to one embodiment of the present invention.

[0056] Figure 6 This is a schematic diagram of the lamp panel power supply circuit of the fan lamp system in another state according to an embodiment of the present invention.

[0057] Figure 7 This is a circuit diagram of a fan-light system in another embodiment of the present invention.

[0058] Figure 8 This is a circuit diagram of a fan-light system in another embodiment of the present invention.

[0059] Figure 9 This is a schematic diagram of the working logic waveform of a fan-light system in one embodiment of the present invention. Detailed Implementation

[0060] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0061] To further understand the present invention, preferred embodiments of the present invention are described below in conjunction with examples. However, it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention, and not for limiting the scope of the claims of the present invention.

[0062] The description in this section pertains to only a few typical embodiments, and the present invention is not limited to the scope of the embodiments described. Substitution of identical or similar prior art methods with some technical features in the embodiments is also within the scope of the description and protection of this invention.

[0063] The terms "coupled" or "connected" in this specification include both direct and indirect connections, such as connections made through active devices, passive devices, or electrical conduction media; they may also include connections made by other active or passive devices that achieve the same or similar functional purpose, as known to those skilled in the art, such as connections through switches, follower circuits, or other circuits or components. In this invention, the term "lamp panel" refers to the lamp in the fan-light system and is not used to limit the style or structure of the lamp in the fan-light system.

[0064] An embodiment of the present invention discloses a fan light control circuit for a fan light system. The fan light control circuit includes a motor control circuit and a lamp panel auxiliary power supply circuit. The motor control circuit has a first input terminal, a second input terminal, a first output terminal, a second output terminal, and a ground potential terminal. The first input terminal of the motor control circuit is coupled to a first terminal of an AC power supply, the second input terminal of the motor control circuit is coupled to a second terminal of the AC power supply, the first output terminal of the motor control circuit is coupled to a first terminal of the motor, and the second output terminal of the motor control circuit is coupled to a second terminal of the motor. The motor control circuit is used to convert the AC power from the AC power supply into chopped AC power and then apply it to the first and second input terminals of the motor to drive the motor. The motor control circuit includes a chopper circuit, which includes two half-bridges.

[0065] The first terminal of the lamp panel auxiliary power supply circuit is coupled to either the first or second input terminal of the motor control circuit, and the second terminal of the lamp panel auxiliary power supply circuit is coupled to the first terminal of the lamp panel. The lamp panel auxiliary power supply circuit is used in conjunction with the motor control circuit to control the on / off state of the power supply circuit in which the lamp panel is located. In one embodiment of the present invention, the first terminal of the lamp panel auxiliary power supply circuit is coupled to the second input terminal of the motor control circuit, and the second terminal of the lamp panel is coupled to the first output terminal of the motor control circuit. In another embodiment of the present invention, the first terminal of the lamp panel auxiliary power supply circuit is coupled to the first input terminal of the motor control circuit, and the second terminal of the lamp panel is coupled to the second output terminal of the motor control circuit.

[0066] like Figure 3As shown, in one embodiment of the present invention, the fan light system includes a motor, a lamp panel L1, and a fan light control circuit. The fan light control circuit includes a motor control circuit 11 and a lamp panel auxiliary power supply circuit 12. The first input terminal of the motor control circuit 11 is coupled to the first terminal of an AC power supply Vac, and the second input terminal of the motor control circuit 11 is coupled to the second terminal of the AC power supply Vac. The first output terminal of the motor control circuit 11 is coupled to the first terminal of the motor, and the second output terminal of the motor control circuit 11 is coupled to the second terminal of the motor. The motor control circuit 11 converts the AC power output from the AC power supply Vac into chopped AC power and outputs it to the motor, thereby driving the motor to work. The first terminal of the lamp panel auxiliary power supply circuit 12 is coupled to the first input terminal of the motor control circuit, and the second terminal of the lamp panel auxiliary power supply circuit 12 is coupled to the first terminal of the lamp panel L1. The second terminal of the lamp panel L1 is coupled to the second output terminal of the motor control circuit 11. In another embodiment, the first terminal of the lamp panel auxiliary power supply circuit 12 is coupled to the second input terminal of the motor control circuit, the second terminal of the lamp panel auxiliary power supply circuit 12 is coupled to the first terminal of the lamp panel L1, and the second terminal of the lamp panel L1 is coupled to the first output terminal of the motor control circuit 11. In one embodiment of the present invention, the AC power supply Vac is the mains power supply and is a sinusoidal AC signal.

[0067] In one embodiment of the present invention, such as Figure 3 As shown, the auxiliary power supply circuit 12 for the lamp panel includes a fifth switch K5. The first terminal of the fifth switch K5 is coupled to the first input terminal of the motor control circuit, and the second terminal of the fifth switch K5 is coupled to the lamp panel L1. The auxiliary power supply circuit 12 for the lamp panel also includes a switching control circuit for the fifth switch K5 (…). Figure 3 (not shown in the image) to control the switching state of the fifth switch K5.

[0068] In another embodiment of the invention, such as Figure 7As shown, the auxiliary power supply circuit for the lamp panel includes a fifth switch K5 and a fifth diode D5. The anode of the fifth diode D5 is coupled to the first input terminal of the motor control circuit, the cathode of the fifth diode is coupled to the first terminal of the fifth switch, and the second terminal of the fifth switch is used to couple to the lamp panel L1. In another embodiment, the auxiliary power supply circuit for the lamp panel includes a fifth switch K5 and a fifth diode D5. The first terminal of the fifth switch K5 is coupled to the first input terminal of the motor control circuit, the second terminal of the fifth switch K5 is coupled to the anode of the fifth diode D5, and the cathode of the fifth diode D5 is used to couple to the lamp panel L1. The purpose of using a fifth diode is that the lamp panel includes a power frequency rectifier bridge. If the third switch Q3 supplies power to the lamp panel during the chopping half-cycle, there is a serious reverse recovery of the power frequency rectifier, which may potentially affect the lifespan of the lamp panel. To solve this problem, a fifth diode can be coupled into the lamp panel power supply circuit. The direction of the current allowed through the fifth diode is consistent with the direction of the current allowed through the body diode of the upper arm of the bridge where the lamp panel is located (such as the third switch Q3). That is, the third switch Q3 is only allowed to supply power to the lamp panel during the continuous conduction half-cycle of the power frequency, while the third switch Q3 will prevent power supply to the lamp panel when it is in the chopping half-cycle, thereby eliminating the reverse recovery problem of the rectifier bridge inside the lamp panel.

[0069] In one embodiment of the present invention, such as Figure 8 As shown, the auxiliary power supply circuit for the lamp panel also includes a first capacitor C1, which is connected in parallel with the lamp panel L1. Since the lamp panel is only powered for half a cycle of the mains frequency, while the internal capacitors of the lamp panel are generally designed for a full cycle of mains frequency power supply, this increases capacitor ripple and reduces capacitor lifespan. Furthermore, the internal voltage of the lamp panel decreases, and in severe cases, the lamp panel may fail to operate. Therefore, a first capacitor can be connected in parallel with the lamp panel to increase the overall capacitance value, thereby improving the internal bus voltage and ripple withstand capability of the lamp panel.

[0070] In one embodiment of the present invention, such as Figure 3 As shown, the motor control circuit 11 includes a chopper circuit, which comprises a first switching transistor Q1, a second switching transistor Q2, a third switching transistor Q3, and a fourth switching transistor Q4. The chopper circuit is used to convert the AC power supply Vac into chopped AC power. Figure 3As shown, the voltage at the first output terminal of the motor control circuit 11 is VOL, and the voltage at the second output terminal of the motor control circuit 11 is VON. The motor control circuit controls the switching states of switching transistors Q1-Q4 to create a voltage difference between the first and second output terminals, thereby driving the motor. The motor control circuit in this invention is a bridgeless AC chopper circuit, directly coupling the AC power supply to the bridge arm of the motor control circuit. It alternately chops according to the positive and negative half-cycles of the input voltage, eliminating the rectifier bridge circuit between the AC power supply and the motor control circuit. This eliminates the additional conduction losses caused by the rectifier bridge, providing a better direction for the integration of higher power modules. Figure 3 As shown, the first switch Q1 is coupled between the first input terminal and the first output terminal of the motor control circuit 11. The second switch Q2 is coupled between the first output terminal of the motor control circuit 11 and the ground potential terminal. The third switch Q3 is coupled between the second input terminal and the second output terminal of the motor control circuit 11. The fourth switch Q4 is coupled between the second output terminal of the motor control circuit 11 and the ground potential terminal.

[0071] In one embodiment of the present invention, the first switch Q1 includes a first body diode D1 connected in parallel, the anode of the first body diode D1 being coupled to the first output terminal of the motor control circuit 11, and the cathode of the first body diode D1 being coupled to the first input terminal of the motor control circuit 11. The second switch Q2 includes a second body diode D2 connected in parallel, the anode of the second body diode D2 being coupled to ground, and the cathode of the second body diode D2 being coupled to the first output terminal of the motor control circuit 11. The third switch Q3 includes a third body diode D3 connected in parallel, the anode of the third body diode D3 being coupled to the second output terminal of the motor control circuit 11, and the cathode of the third body diode D3 being coupled to the second input terminal of the motor control circuit 11. The fourth switch Q4 includes a fourth body diode D4 connected in parallel, the anode of the fourth body diode D4 being coupled to ground, and the cathode of the fourth body diode D4 being coupled to the second output terminal of the motor control circuit 11. In one embodiment, the switching transistors Q1, Q2, Q3, and Q4 can be one of a metal-oxide-semiconductor field-effect transistor (MOSFET), a junction field-effect transistor (JFET), and an insulated-gate bipolar transistor (IGBT). Preferably, the switching transistors Q1, Q2, Q3, and Q4 may include parasitic body diodes for implementing asynchronous rectification. In another embodiment of the invention, the switching transistors Q1, Q2, Q3, and Q4 may each be connected in parallel with discrete diodes.

[0072] In one embodiment of the present invention, the fan light system is controlled by a fan light control circuit, which can independently control the working state of the fan and the light panel. The working state of the fan light system can be divided into four working states: the motor and the light panel work simultaneously; the motor works and the light panel does not work; the light panel works and the motor does not work; and neither the motor nor the light panel works. In another embodiment, the motor control circuit controls the switching states of switching transistors Q1-Q4 based on switch control signals PWM1-PWM4, wherein the first switch control signal PWM1 is used to control the switching state of the first switching transistor Q1, the second switch control signal PWM2 is used to control the switching state of the second switching transistor Q2, the third switch control signal PWM3 is used to control the switching state of the third switching transistor Q3, and the fourth switch control signal PWM4 is used to control the switching state of the fourth switching transistor Q4.

[0073] In one embodiment of the present invention, in a first state, the fan light control circuit controls the motor and the light panel to work simultaneously. For example... Figure 4 As shown, the auxiliary power supply circuit 12 of the lamp panel controls the fifth switch K5 to be turned on. (As indicated...) Figure 9 As shown, when the AC power supply is in the positive half-cycle (Vac>0), the motor control circuit 11 controls the third switch Q3 to turn on based on the PWM3 signal, controls the fourth switch Q4 to turn on based on the PWM4 signal, controls the first switch Q1 to switch with a first duty cycle based on the PWM1 signal, and controls the second switch Q2 to switch based on the PWM2 signal. The PWM2 signal is a PWM signal complementary to the PWM1 signal, so the switching action of the second switch Q2 is complementary to the switching action of the first switch Q1. Furthermore, when the AC power supply is in the negative half-cycle (Vac<0), the motor control circuit 11 controls the first switch Q1 to turn on based on the PWM1 signal, controls the second switch Q2 to turn on based on the PWM2 signal, controls the third switch Q3 to switch with a first duty cycle based on the PWM3 signal, and controls the fourth switch Q4 to switch based on the PWM4 signal. The PWM4 signal is a PWM signal complementary to the PWM3 signal, so the switching action of the fourth switch Q4 is complementary to the switching action of the third switch Q3. By adjusting the first duty cycle, the average amplitude of the output voltage to the motor can be adjusted, thereby achieving stepless speed regulation of the motor.

[0074] In one embodiment of the present invention, such as Figure 9As shown, a dead time period is also set within the transition interval between the positive and negative half-cycles of the AC power supply. When the AC power supply is in the dead time period, the motor control circuit controls the second and fourth switching transistors to turn on, and the first and third switching transistors to turn off. By setting the dead time period and controlling the switching of transistors Q1-Q4, the failure rate of the fan light control circuit can be effectively reduced, thereby improving the stability of the fan light system.

[0075] In the first state, the motor control circuit 11 can control the motor to operate throughout the entire cycle of the AC power supply. When the AC power supply is in the positive half-cycle, such as... Figure 4 As shown, when the auxiliary power supply circuit 12 of the lamp panel controls the fifth switch K5 to conduct, the AC power source Vac, the fifth switch K5, the lamp panel L1, and the third switch Q3 (through the body diode) form a power supply circuit, causing the lamp panel L1 to operate. When the AC power supply is in the negative half-cycle, as... Figure 5 As shown, when the auxiliary power supply circuit 12 controls the fifth switch K5 to turn on, and the motor control circuit 11 controls the third switch Q3 to turn on, the AC power source Vac, the third switch Q3, the lamp panel L1, and the fifth switch K5 form a power supply circuit, enabling the lamp panel L1 to operate. Therefore, under the coordinated control of the motor control circuit 11 and the auxiliary power supply circuit 12, the on / off state of the power supply circuit for the lamp panel L1 is controlled. When the AC power supply is in the positive half-cycle, the lamp panel L1 can operate continuously. When the AC power supply is in the negative half-cycle, the power supply capability of the lamp panel L1 depends on the first duty cycle of the PWM3 signal used to control the third switch Q3. Even if the first duty cycle of the PWM3 signal is small during the negative half-cycle of the AC power supply, resulting in a weaker power supply capability, the positive half-cycle of the AC power supply is sufficient to provide enough power to ensure the normal power supply of the lamp panel.

[0076] In one embodiment of the present invention, in the second state, the fan light control circuit controls the motor to work, and the lamp panel does not work. The lamp panel auxiliary power supply circuit 12 controls the fifth switch K5 to turn off, at which time the power supply circuit of the lamp panel L1 is in an open circuit state, and the lamp panel L1 does not work. In addition, when the AC power supply is in the positive half-cycle, the motor control circuit 11 controls the third switch Q3 and the fourth switch Q4 to conduct, the first switch operates with the first duty cycle, and the switching action of the second switch is complementary to the switching action of the first switch. When the AC power supply is in the negative half-cycle, the motor control circuit 11 controls the first switch Q1 and the second switch Q2 to conduct, the third switch Q3 operates with the first duty cycle, and the switching action of the fourth switch is complementary to the switching action of the third switch. A dead zone is also set within the transition interval between the positive and negative half-cycles of the AC power supply. When the AC power supply is in the dead zone, the motor control circuit controls the second and fourth switching transistors to turn on, and the first and third switching transistors to turn off.

[0077] In one embodiment of the present invention, such as Figure 6 As shown, in the third state, the fan light control circuit controls the motor to not work, while the lamp panel works. The lamp panel auxiliary power supply circuit 12 controls the fifth switch K5 to be turned on. The motor control circuit controls the switching of the first switch Q1, the second switch Q2, the third switch Q3, and the fourth switch Q4 to keep the motor in a stopped state. In a specific embodiment, the motor control circuit 11 controls the first switch Q1 and the third switch Q3 to be turned off, and the second switch Q2 and the fourth switch Q4 to be turned on. In the above switching states of switches Q1-Q4, the motor does not work. When the AC power supply is in the positive half-cycle, the AC source Vac, the fifth switch K5, the lamp panel L1, and the third switch Q3 form a power supply circuit, causing the lamp panel L1 to work.

[0078] In another embodiment of the invention, in the third state, the fan light control circuit controls the motor to not work, while the lamp panel works. The lamp panel auxiliary power supply circuit 12 controls the fifth switch K5 to be turned on. When the AC power supply is in the positive half-cycle, the motor control circuit 11 controls the first switch Q1 to be turned off, and the second switch Q2, the third switch Q3, and the fourth switch Q4 to be turned on. When the AC power supply is in the negative half-cycle, the motor control circuit 11 controls the third switch Q3 to be turned off, and the first switch Q1, the second switch Q2, and the fourth switch Q4 to be turned on. The specific working principle is as follows: when the AC power supply is in the positive half-cycle, the first switch Q1 is turned off, so the motor does not work, while the AC source Vac, the fifth switch K5, the lamp panel L1, and the third switch Q3 form a power supply circuit, making the lamp panel L1 work.

[0079] In one embodiment of the present invention, in the fourth state, the fan light control circuit controls both the motor and the lamp panel to be inactive. The lamp panel auxiliary power supply circuit 12 controls the fifth switch K5 to be turned off. The motor control circuit controls the switching of the first switch Q1, the second switch Q2, the third switch Q3, and the fourth switch Q4 to keep the motor in a stopped state. In a specific embodiment, the motor control circuit 11 controls the first switch Q1 and the third switch Q3 to be turned off, and the second switch Q2 and the fourth switch Q4 to be turned on.

[0080] In another embodiment of the invention, in the fourth state, the fan light control circuit controls both the motor and the lamp panel to be inactive. The lamp panel auxiliary power supply circuit 12 controls the fifth switch K5 to be turned off. Furthermore, when the AC power supply is in the positive half-cycle, the motor control circuit 11 controls the first switch Q1 to be turned off, and the second switch Q2, the third switch Q3, and the fourth switch Q4 to be turned on. When the AC power supply is in the negative half-cycle, the motor control circuit 11 controls the third switch Q3 to be turned off, and the first switch Q1, the second switch Q2, and the fourth switch Q4 to be turned on.

[0081] An embodiment of the present invention also discloses a fan light system, which includes a motor, a light panel, and a fan light control circuit as described above. The first end of the motor is coupled to the first output end of the motor control circuit, and the second end of the motor is coupled to the second output end of the motor control circuit.

[0082] An embodiment of the present invention also discloses a control method for a fan light system. The fan light system includes a motor, a lamp panel, and a fan light control circuit. The fan light control circuit includes a motor control circuit and a lamp panel auxiliary power supply circuit. The first and second input terminals of the motor control circuit are respectively coupled to an AC power supply, and the first and second output terminals of the motor control circuit are respectively coupled to the motor. The first terminal of the lamp panel auxiliary power supply circuit is coupled to either the first or second input terminal of the motor control circuit, and the second terminal of the lamp panel auxiliary power supply circuit is coupled to the first terminal of the lamp panel. The second terminal of the lamp panel is coupled to either the first or second output terminal of the motor control circuit. The lamp panel auxiliary power supply circuit includes a fifth switch K5. The motor control circuit includes a chopper circuit for converting the AC power from the AC power supply into chopped AC power. The chopper circuit includes a first switch Q1, a second switch Q2, a third switch Q3, and a fourth switch Q4. The first switch Q1 is coupled between the first input terminal and the first output terminal of the motor control circuit 11. The second switch Q2 is coupled between the first output terminal and the ground potential terminal of the motor control circuit 11. The third switch Q3 is coupled between the second input terminal and the second output terminal of the motor control circuit 11. The fourth switch Q4 is coupled between the second output terminal of the motor control circuit 11 and the ground potential terminal. The control method of the fan light system includes:

[0083] The on / off state of the power supply circuit to the lamp panel is controlled by the auxiliary power supply circuit and the motor control circuit, thereby controlling the working state of the lamp panel; and

[0084] The motor control circuit converts the AC power from the AC power supply into chopped AC power, which is then applied to the first and second input terminals of the motor to control the motor's operating state.

[0085] In one embodiment of the present invention, in the first state, the motor and the lamp panel operate simultaneously; the lamp panel auxiliary power supply circuit controls the fifth switch K5 to be turned on; when the AC power supply is in the positive half-cycle, the motor control circuit controls the third switch Q3 and the fourth switch Q4 to be turned on, the first switch Q1 performs a switching action with a first duty cycle, and the switching action of the second switch Q2 is complementary to the switching action of the first switch Q1; and when the AC power supply is in the negative half-cycle, the motor control circuit controls the first switch Q1 and the second switch Q2 to be turned on, the third switch Q3 performs a switching action with a first duty cycle, and the switching action of the fourth switch Q4 is complementary to the switching action of the third switch Q3.

[0086] In one embodiment of the present invention, in the second state, the motor is working and the lamp panel is not working; the lamp panel auxiliary power supply circuit controls the fifth switch K5 to turn off; when the AC power supply is in the positive half-cycle, the motor control circuit controls the third switch Q3 and the fourth switch Q4 to turn on, the first switch Q1 performs a switching action with a first duty cycle, and the switching action of the second switch Q2 is complementary to the switching action of the first switch Q1; and when the AC power supply is in the negative half-cycle, the motor control circuit controls the first switch Q1 and the second switch Q2 to turn on, the third switch Q3 performs a switching action with a first duty cycle, and the switching action of the fourth switch is complementary to the switching action of the third switch.

[0087] In one embodiment of the present invention, a dead zone period is further provided within the transition interval between the positive half-cycle and the negative half-cycle of the AC power supply. When the AC power supply is in the dead zone period, the second and fourth switches are controlled to turn on, and the first and third switches are controlled to turn off.

[0088] In one embodiment of the present invention, in the third state, the motor is not working, but the lamp panel is working; the lamp panel auxiliary power supply circuit controls the fifth switch K5 to be turned on; and the first, second, third, and fourth switches are switched to keep the motor in a stopped state. In a specific embodiment, the motor control circuit controls the first switch Q1 and the third switch Q3 to be turned off, and the second switch Q2 and the fourth switch Q4 to be turned on.

[0089] In another embodiment of the present invention, in the third state, the motor is not working, but the lamp panel is working; the lamp panel auxiliary power supply circuit controls the fifth switch K5 to be turned on; and when the AC power supply is in the positive half-cycle, the motor control circuit controls the first switch Q1 to be turned off, and the second switch Q2, the third switch Q3 and the fourth switch Q4 to be turned on, and when the AC power supply is in the negative half-cycle, the motor control circuit controls the third switch Q3 to be turned off, and the first switch Q1, the second switch Q2 and the fourth switch Q4 to be turned on.

[0090] In one embodiment of the present invention, in the fourth state, neither the motor nor the lamp panel works; the lamp panel auxiliary power supply circuit controls the fifth switch K5 to turn off; and the first, second, third, and fourth switches are switched to keep the motor in a stopped state. In a specific embodiment, the motor control circuit controls the first switch Q1 and the third switch Q3 to turn off, and the second switch Q2 and the fourth switch Q4 to turn on.

[0091] In another embodiment of the present invention, in the fourth state, neither the motor nor the lamp panel works; the lamp panel auxiliary power supply circuit controls the fifth switch K5 to turn off; and when the AC power supply is in the positive half-cycle, the motor control circuit controls the first switch Q1 to turn off, and the second switch Q2, the third switch Q3 and the fourth switch Q4 to turn on; and when the AC power supply is in the negative half-cycle, the motor control circuit controls the third switch Q3 to turn off, and the first switch Q1, the second switch Q2 and the fourth switch Q4 to turn on.

[0092] The fan light control circuit, fan light system, and control method proposed in this invention enable a single-phase induction motor stepless electronic speed controller to be compatible with the current "two-input, three-output" fan light controller wiring. The motor and light panel can be controlled independently, and the motor speed can be deeply steplessly adjusted. This invention eliminates the rectifier circuit between the AC power supply and the motor control circuit, further simplifying the system, reducing the number of passive components, resulting in a smaller size, higher efficiency, and easier integration with higher power modules. This invention effectively reduces system complexity and cost, has a high power factor, and can significantly improve the motor's efficiency at low speeds while reducing motor noise.

[0093] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0094] The description and application of the present invention herein are illustrative and not intended to limit the scope of the invention to the embodiments described above. Effects or advantages involved in the embodiments may not be apparent due to various factors, and the description of effects or advantages is not intended to limit the embodiments. Variations and modifications of the embodiments disclosed herein are possible, and various substitutions and equivalents of the components in the embodiments are well known to those skilled in the art. It should be apparent to those skilled in the art that the invention can be implemented in other forms, structures, arrangements, proportions, and with other components, materials, and parts without departing from the spirit or essential characteristics of the invention. Other variations and modifications can be made to the embodiments disclosed herein without departing from the scope and spirit of the invention.

Claims

1. A fan light control circuit, characterized in that, The fan light control circuit includes: A motor control circuit has a first input terminal, a second input terminal, a first output terminal, a second output terminal, and a ground potential terminal. The first and second input terminals are coupled to an AC power supply, and the first and second output terminals are coupled to a motor. The motor control circuit converts the AC power from the AC power supply into chopped AC power and applies it to the motor to drive the motor. The motor control circuit includes a chopper circuit, which includes two half-bridges. The chopper circuit includes a first switch, a second switch, a third switch, and a fourth switch. The chopper circuit converts the AC power from the AC power supply into chopped AC power. The first switch is coupled between the first input terminal and the first output terminal of the motor control circuit. The second switch is coupled between the first output terminal and the ground potential terminal of the motor control circuit. The third switch is coupled between the second input terminal and the second output terminal of the motor control circuit. The fourth switch is coupled between the second output terminal and the ground potential terminal of the motor control circuit. An auxiliary power supply circuit for the lamp panel is used in conjunction with the motor control circuit to control the on / off state of the power supply circuit in which the lamp panel is located; wherein, the first end of the auxiliary power supply circuit for the lamp panel is coupled to the second input end of the motor control circuit, and the second end of the lamp panel is coupled to the first output end of the motor control circuit; or, the first end of the auxiliary power supply circuit for the lamp panel is coupled to the first input end of the motor control circuit, and the second end of the lamp panel is coupled to the second output end of the motor control circuit; the second end of the auxiliary power supply circuit for the lamp panel is coupled to the first end of the lamp panel.

2. The fan light control circuit according to claim 1, characterized in that, The auxiliary power supply circuit for the lamp panel includes a fifth switch; the first end of the fifth switch is coupled to the first or second input end of the motor control circuit, and the second end of the fifth switch is used to couple to the lamp panel.

3. The fan light control circuit according to claim 1, characterized in that, The auxiliary power supply circuit for the lamp panel includes a fifth switch and a fifth diode; in The anode of the fifth diode is coupled to the first or second input terminal of the motor control circuit, the cathode of the fifth diode is coupled to the first terminal of the fifth switch, and the second terminal of the fifth switch is used to couple to the lamp panel. Alternatively, the first end of the fifth switch is coupled to the first or second input end of the motor control circuit, the second end of the fifth switch is coupled to the anode of the fifth diode, and the cathode of the fifth diode is used to couple to the lamp panel.

4. The fan light control circuit according to claim 3, characterized in that, The auxiliary power supply circuit for the lamp panel also includes a first capacitor, which is connected in parallel with the lamp panel.

5. The fan light control circuit according to claim 1, characterized in that, The first switching transistor includes a first body diode connected in parallel, the anode of the first body diode is coupled to the first output terminal of the motor control circuit, and the cathode of the first body diode is coupled to the first input terminal of the motor control circuit. The second switching transistor includes a second body diode connected in parallel, the anode of the second body diode is grounded, and the cathode of the second body diode is coupled to the first output terminal of the motor control circuit; The third switching transistor includes a third body diode connected in parallel. The anode of the third body diode is coupled to the second output terminal of the motor control circuit, and the cathode of the third body diode is coupled to the second input terminal of the motor control circuit. as well as The fourth switching transistor includes a fourth body diode connected in parallel, with the anode of the fourth body diode coupled to the ground potential terminal and the cathode of the fourth body diode coupled to the second output terminal of the motor control circuit.

6. The fan light control circuit according to claim 1, characterized in that, In the first state, the motor and the lamp panel work simultaneously; the auxiliary power supply circuit of the lamp panel controls the fifth switch to be turned on; The motor control circuit controls the switching of the first, second, third, and fourth switching transistors to convert the AC power from the AC source into chopped AC power to drive the motor.

7. The fan light control circuit according to claim 1, characterized in that, In the second state, the motor is working, the lamp panel is not working, and the lamp panel auxiliary power supply circuit controls the fifth switch to turn off. The motor control circuit controls the switching of the first, second, third, and fourth switching transistors to convert the AC power from the AC source into chopped AC power to drive the motor.

8. The fan light control circuit according to claim 6 or 7, characterized in that, A dead zone is set in the transition interval between the positive half-cycle and the negative half-cycle of the AC power supply. When the AC power supply is in the dead zone, the motor control circuit controls the second and fourth switching transistors to turn on, and the first and third switching transistors to turn off. When the AC power supply is in a positive half-cycle excluding the dead zone, the motor control circuit controls the third and fourth switching transistors to conduct, the first switching transistor switches with a first duty cycle, and the switching action of the second switching transistor is complementary to that of the first switching transistor; and When the AC power supply is in the negative half-cycle excluding the dead zone, the motor control circuit controls the first and second switching transistors to turn on, the third switching transistor to switch with the first duty cycle, and the switching action of the fourth switching transistor is complementary to the switching action of the third switching transistor.

9. The fan light control circuit according to claim 1, characterized in that, In the third state, the motor is not working, but the lamp panel is working; the lamp panel auxiliary power supply circuit controls the fifth switch to be turned on; and The motor control circuit controls the switching of the first, second, third, and fourth switching transistors to keep the motor in a stopped state.

10. The fan light control circuit according to claim 1, characterized in that, In the fourth state, neither the motor nor the lamp panel is working; the lamp panel auxiliary power supply circuit controls the fifth switch to turn off; and The motor control circuit controls the switching of the first, second, third, and fourth switching transistors to keep the motor in a stopped state.

11. The fan light control circuit according to claim 9 or 10, characterized in that, The motor control circuit controls the first and third switching transistors to turn off, and the second and fourth switching transistors to turn on; or, when the AC power supply is in the positive half-cycle, the motor control circuit controls the first switching transistor to turn off, and the second, third, and fourth switching transistors to turn on, and when the AC power supply is in the negative half-cycle, the motor control circuit controls the third switching transistor to turn off, and the first, second, and fourth switching transistors to turn on.

12. A fan-light system, characterized in that, The fan light system includes a motor, a light panel, and a fan light control circuit as described in any one of claims 1-7 and 9-10, wherein a first end of the motor is coupled to a first output end of the motor control circuit, and a second end of the motor is coupled to a second output end of the motor control circuit.

13. A control method for a fan-light system, characterized in that, The fan light system includes a motor, a lamp panel, and a fan light control circuit as described in claim 1. The fan light control circuit includes a motor control circuit and a lamp panel auxiliary power supply circuit. The first end of the lamp panel is used to couple to the lamp panel auxiliary power supply circuit, and the second end of the lamp panel is used to couple to the motor control circuit. The auxiliary power supply circuit for the lamp panel includes a fifth switch; The motor control circuit includes a chopper circuit; the chopper circuit is used to convert the AC power from the AC power source into chopped AC power; the chopper circuit includes a first switch, a second switch, a third switch, and a fourth switch; the control method includes: The on / off state of the power supply circuit of the lamp panel is controlled by the lamp panel auxiliary power supply circuit and the motor control circuit, thereby controlling the working state of the lamp panel; as well as The AC power from the AC power supply is converted into chopped AC power by a motor control circuit and then applied to the motor to control the working state of the motor.

14. The control method according to claim 13, characterized in that, The control method further includes: In the first state, the motor and the lamp panel work simultaneously; the fifth switch is activated. The first, second, third, and fourth switching transistors are switched to convert the AC power from the AC power supply into chopped AC power to drive the motor.

15. The control method according to claim 13, characterized in that, The control method further includes: In the second state, the motor is working, but the lamp panel is not working; the fifth control switch is turned off. The first, second, third, and fourth switching transistors are switched to convert the AC power from the AC power supply into chopped AC power to drive the motor.

16. The control method according to claim 13, characterized in that, The control method further includes: In the third state, the motor is not working, but the lamp panel is working; the fifth control switch is turned on; and The first, second, third, and fourth switching transistors are switched to keep the motor in a stopped state.

17. The control method according to claim 13, characterized in that, The control method further includes: In the fourth state, neither the motor nor the lamp panel works; the fifth control switch is turned off; and The first, second, third, and fourth switching transistors are switched to keep the motor in a stopped state.

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