Fan light drive circuit, control method and fan light system

Abstract

This invention proposes a fan light driving circuit, control method, and fan light system. The fan light driving circuit includes a motor control circuit and a lamp panel auxiliary power supply circuit. The motor control circuit converts AC power from an AC power source into chopped AC power before applying it to the motor to drive it. The motor control circuit includes a chopper circuit comprising two half-bridges. The lamp panel auxiliary power supply circuit works in conjunction with the motor control circuit to control the on / off state of the power supply circuit containing the lamp panel. The lamp panel auxiliary power supply circuit includes a silicon controlled rectifier (SCR) and a SCR driver circuit. The first terminal of the SCR is coupled to the lamp panel, and the second terminal of the SCR is coupled to either the first or second input terminal of the motor control circuit. The SCR driver circuit is coupled to the gate of the SCR. The fan light driving circuit, control method, and fan light system proposed in this invention can effectively reduce production costs, decrease product size, and increase service life.

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 driving circuit, control method, and fan light system. 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. However, traditional fans use tap-based speed control, which has limitations such as limited speed settings and low efficiency under light loads. To address this issue, a highly efficient, high-power-factor stepless electronic speed control solution will gradually replace the traditional tap-based speed control solution. Currently, traditional fan light controllers use a "two-in, three-out" wiring configuration. 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.

[0003] 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.

[0004] In a novel bridgeless fan light driving scheme, the fan light driving circuit includes a motor control circuit and a lamp panel auxiliary power supply circuit. The motor control circuit is coupled to the first and second terminals of the AC power supply, and also to the first and second terminals of the motor. The motor control circuit converts the AC power from the AC power supply into chopped AC power, which is then applied to the motor to drive it. The lamp panel auxiliary power supply circuit works in conjunction with the motor control circuit to control the on / off state of the power supply circuit containing the lamp panel. This scheme effectively solves many problems related to efficiency, noise, and speed regulation of single-phase motors, and also provides lamp control functionality. The lamp panel auxiliary power supply circuit includes a fifth switch, which is a high-voltage switch. In this application scenario, a relay is typically used as the fifth switch. However, relays suffer from high cost, large size, and short lifespan.

[0005] Therefore, a new topology or control method is needed to solve the above-mentioned technical problems. Summary of the Invention

[0006] To address at least some of the aforementioned problems, this invention proposes a fan light driving circuit, control method, and fan light system, which can effectively reduce production costs, decrease product size, and increase service life.

[0007] One embodiment of the present invention discloses a fan light driving circuit, the fan light driving circuit comprising:

[0008] 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 used to couple to an AC power supply, and the first and second output terminals are used to couple 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; and

[0009] 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. The lamp panel auxiliary power supply circuit includes a thyristor and a thyristor drive circuit. The first end of the thyristor is used to couple to the lamp panel, and the second end of the thyristor is coupled to the first or second input terminal of the motor control circuit. The thyristor drive circuit is coupled to the gate of the thyristor.

[0010] In one embodiment of the present invention, the thyristor driving circuit includes a fifth switch, which is used to control the switching state of the thyristor.

[0011] As one embodiment of the present invention, the thyristor driving circuit includes:

[0012] Auxiliary power supply;

[0013] The fifth switch has its first terminal coupled to the auxiliary power supply;

[0014] The first capacitor has its first terminal coupled to the second terminal of the fifth switch, and its second terminal coupled to the second terminal of the thyristor.

[0015] A first resistor, the first end of which is coupled to the first end of a first capacitor, and the second end of which is coupled to the gate of a thyristor; and

[0016] The fifth diode is coupled between the auxiliary power supply and the first capacitor. The anode of the fifth diode is coupled to the auxiliary power supply, and the cathode of the fifth diode is coupled to the first terminal of the first capacitor.

[0017] As one embodiment of the present invention, the lamp panel auxiliary power supply circuit further includes:

[0018] The sixth diode, whose anode is coupled to the first terminal of the thyristor, and whose cathode is coupled to the first terminal of the lamp panel; and

[0019] The second capacitor has its first end coupled to the cathode of the sixth diode, and its second end coupled to the second end of the lamp panel.

[0020] In one embodiment of the present invention, the thyristor driving circuit further includes a second resistor, which is coupled between the auxiliary power supply and the first capacitor. The first end of the second resistor is coupled to the auxiliary power supply, and the second end of the second resistor is coupled to the first end of the first capacitor.

[0021] In one embodiment of the present invention, the fifth switch is a low-voltage transistor or an optocoupler.

[0022] 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

[0023] 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.

[0024] 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.

[0025] 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.

[0026] 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

[0027] 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.

[0028] 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;

[0029] 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.

[0030] In one embodiment of the present invention, in the second state, the motor is working and the lamp panel is not working, and the lamp panel auxiliary power supply circuit controls the fifth switch to be turned off.

[0031] 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.

[0032] In one embodiment of the present invention, in the third state, the motor is not working, and the lamp panel is working; the lamp panel auxiliary power supply circuit controls the fifth switch to be turned on; and

[0033] The motor control circuit controls the switching of the first, second, third, and fourth switching transistors to keep the motor in a stopped state. The half-bridge containing the thyristor is connected by switching control to replenish the charge of the first capacitor in the thyristor drive circuit.

[0034] 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

[0035] The motor control circuit controls the switching of the first, second, third, and fourth switching transistors to keep the motor in a stopped state.

[0036] One embodiment of the present invention discloses a fan light system, which includes a motor, a lamp panel, and a fan light driving circuit as described above. The first end of the motor is coupled to the first output terminal of the motor control circuit, the second end of the motor is coupled to the second output terminal of the motor control circuit, and the first end of the lamp panel is coupled to the first end of the thyristor.

[0037] One embodiment of the present invention discloses a control method for a fan light driving circuit. The fan light driving circuit includes a motor control circuit and a lamp panel auxiliary power supply circuit. The lamp panel auxiliary power supply circuit includes a thyristor and a thyristor driving circuit. The thyristor driving circuit includes a fifth switch. The control method includes:

[0038] 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

[0039] 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.

[0040] This invention proposes a fan light driving circuit, control method, and fan light system. The fan light driving 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 motor control circuit converts AC power from an AC power source 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. The lamp panel auxiliary power supply circuit works in conjunction with the motor control circuit to control the on / off state of the power supply circuit containing the lamp panel. The lamp panel auxiliary power supply circuit includes a silicon controlled rectifier (SCR) and a SCR driver circuit. The first terminal of the SCR is coupled to the lamp panel, and the second terminal of the SCR is coupled to either the first or second input terminal of the motor control circuit. The SCR driver circuit is coupled to the gate of the SCR. The fan light driving circuit, control method, and fan light system proposed in this invention, by replacing relays with SCRs and SCR driver circuits, can effectively reduce production costs, decrease the size of the driving circuit, and increase its service life. Attached Figure Description

[0041] Figure 1 A wiring diagram of a prior art fan light and controller is shown;

[0042] Figure 2 A circuit diagram of a prior art "two-input, three-output" fan-light system is shown.

[0043] Figure 3 A circuit diagram of a fan-light system according to an embodiment of the present invention is shown;

[0044] Figure 4 A circuit diagram of a fan-light system according to another embodiment of the present invention is shown;

[0045] Figure 5 A circuit diagram of a fan-light system according to yet another embodiment of the present invention is shown. Detailed Implementation

[0046] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0047] 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.

[0048] 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.

[0049] The terms "coupled" or "connected" in this specification include both direct and indirect connections. An indirect connection is a connection made through an intermediate medium, such as an electrically conductive medium, which may have parasitic inductance or capacitance. Indirect connections may also include connections made through other active or passive devices to achieve the same or similar functional purpose, 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.

[0050] One embodiment of the present invention discloses a fan light driving circuit, which 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 and second input terminals of the motor control circuit 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 lamp panel auxiliary power supply circuit works 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. The lamp panel auxiliary power supply circuit includes a silicon controlled rectifier (SCR) and a SCR driving circuit. The first terminal of the SCR is coupled to the lamp panel, the second terminal of the SCR is coupled to either the first or second input terminal of the motor control circuit, and the SCR driving circuit is coupled to the gate of the SCR. In another embodiment, the SCR is a three-terminal bidirectional SCR.

[0051] like Figure 3As shown, in one embodiment of the present invention, the fan light system includes a motor M, a lamp panel L1, and a fan light driving circuit. The fan light driving 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 the AC power supply Vac, 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 M, the second output terminal of the motor control circuit 11 is coupled to the second terminal of the motor M, and the ground potential terminal of the motor control circuit 11 is coupled to a reference ground. The motor control circuit 11 includes a chopper circuit, which includes two half-bridges. A first switch Q1 and a second switch Q2 form the first half-bridge, and a third switch Q3 and a fourth switch Q4 form the second half-bridge. By controlling the switching states of the first switch Q1, the second switch Q2, the third switch Q3, and the fourth switch Q4, the AC power supply Vac can be converted into chopped AC power. Additionally, the lamp panel auxiliary power supply circuit 12 includes a thyristor T1 and a thyristor driving circuit. The first terminal of the thyristor T1 is coupled to the first terminal of the lamp panel L1, the second terminal of the thyristor T1 is coupled to the first input terminal of the motor control circuit, the thyristor drive circuit is coupled to the gate of the thyristor T1, and 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 thyristor T1 is coupled to the first terminal of the lamp panel L1, the second terminal of the thyristor T1 is coupled to the second input terminal of the motor control circuit, the thyristor drive circuit is coupled to the gate of the thyristor T1, and the second terminal of the lamp panel L1 is coupled to the first output terminal of the motor control circuit 11.

[0052] In one embodiment of the present invention, such as Figure 3As shown, the thyristor drive circuit includes an auxiliary power supply Vaux, a fifth switch Q5, a fifth diode D5, a first capacitor C1, and a first resistor R1. The first terminal of the fifth switch Q5 is coupled to the positive terminal of the auxiliary power supply Vaux, and the negative terminal of the auxiliary power supply Vaux is coupled to reference ground. The reference ground of the auxiliary power supply Vaux and the reference ground of the motor control circuit 11 are at the same potential. The anode of the fifth diode D5 is coupled to the second terminal of the fifth switch Q5, the first terminal of the first capacitor C1 is coupled to the cathode of the fifth diode D5, and the second terminal of the first capacitor C1 is coupled to the second terminal of the thyristor T1. The first terminal of the first resistor R1 is coupled to the first terminal of the first capacitor C1, and the second terminal of the first resistor R1 is coupled to the gate of the thyristor T1. In another embodiment, the fifth diode D5 is coupled between the auxiliary power supply Vaux and the fifth switch Q5, with the anode of the fifth diode D5 coupled to the positive terminal of the auxiliary power supply Vaux and the cathode of the fifth diode D5 coupled to the first terminal of the fifth switch Q5. In one embodiment of the present invention, the fifth switch Q5 is a low-voltage switch. Controlling the switching state of the low-voltage switch controls the conduction and cut-off states of the high-voltage path, replacing the relay in the auxiliary power supply circuit of the lamp panel in existing solutions. Replacing the relay with a thyristor and its driver circuit effectively reduces production costs, decreases the size of the driver circuit, reduces the drive current (i.e., the current driving the fifth switch Q5 is less than the current driving the relay), and increases service life. In a specific embodiment, the fifth switch Q5 is a low-voltage transistor or optocoupler. Controlling the switching state of the fifth switch controls the switching state of the thyristor; the specific operation of the fan lamp driver circuit will be further described later.

[0053] In one embodiment of the present invention, such as Figure 3 As shown, the chopper circuit includes a first switch Q1, a second switch Q2, a third switch Q3, and a fourth switch Q4. The chopper circuit is used to convert AC power from an AC source into chopped AC power. The first switch Q1 is coupled between the first input terminal and the first output terminal of the motor control circuit. The second switch Q2 is coupled between the first output terminal of the motor control circuit and ground. The third switch Q3 is coupled between the second input terminal and the second output terminal of the motor control circuit. The fourth switch Q4 is coupled between the second output terminal of the motor control circuit and ground.

[0054] 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, and the cathode of the first body diode D1 being coupled to the first input terminal of the motor control circuit. 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. 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, and the cathode of the third body diode D3 being coupled to the second input terminal of the motor control circuit. 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. In one embodiment, the first switch Q1, the second switch Q2, the third switch Q3, and the fourth switch 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 first switch Q1, the second switch Q2, the third switch Q3, and the fourth switch Q4 may each include a parasitic body diode for asynchronous rectification. In another embodiment of the invention, the first switch Q1, the second switch Q2, the third switch Q3, and the fourth switch Q4 may each be connected in parallel with a discrete diode.

[0055] In one embodiment of the present invention, the operating states of the fan light system can be divided into four types: simultaneous operation of the motor and the light panel, operation of the motor and inoperability of the light panel, operation of the motor and operation of the light panel, and inoperability of both the motor and the light panel. The fan light drive circuit controls the switching between these four operating states.

[0056] In a specific embodiment of the present invention, combined with Figure 3In the first state, motor M and lamp panel L1 operate simultaneously. The lamp panel auxiliary power supply circuit 12 controls the fifth switch Q5 to conduct. When the AC power supply Vac is in the negative half-cycle, motor control circuit 11 controls the first switch Q1 and the second switch Q2 to conduct. At this time, the potential of the second terminal of the thyristor T1 is pulled to reference ground, the fifth diode D5 conducts, the auxiliary power supply Vaux charges the first capacitor C1, and triggers the gate of the thyristor T1 through the first resistor R1, at which point the thyristor T1 conducts. When the AC power supply Vac is in the negative half-cycle, motor control circuit 11 controls the third switch Q3 to switch with the first duty cycle, and controls the switching action of the fourth switch Q4 to be complementary to the switching action of the third switch Q3. When the AC power supply Vac is in the positive half-cycle, motor control circuit 11 controls the third switch Q3 and the fourth switch Q4 to conduct. At this time, the potential of the second terminal of the thyristor T1 is pulled to high voltage, and the fifth diode D5 is cut off. The first capacitor C1 uses its remaining charge to power the first resistor R1, thereby triggering the gate of the thyristor T1, at which point the thyristor T1 is turned on. When the AC power supply Vac is in the positive half-cycle, the motor control circuit 11 controls the first switch Q1 to switch with a first duty cycle, and controls the switching action of the second switch Q2 to be complementary to the switching action of the first switch Q1.

[0057] In a specific embodiment of the present invention, in the second state, the motor M is working and the lamp panel L1 is not working, and the lamp panel auxiliary power supply circuit 12 controls the fifth switch Q5 to turn off. When the charge of the first capacitor C1 is completely released, the thyristor T1 will remain in the off state after the last conduction cycle ends because there is no gate trigger signal, so the lamp panel L1 does not work. When the AC power supply Vac 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 Q1 performs a switching action with the 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 Vac 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 performs a switching action with the first duty cycle, and the switching action of the fourth switch is complementary to the switching action of the third switch.

[0058] In a specific embodiment of the present invention, in the third state, the motor M is not working and the lamp panel L1 is working. The lamp panel auxiliary power supply circuit 12 controls the fifth switch Q5 to be turned on. The motor control circuit 11 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 M in a stopped state. In one 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. At this time, the lamp panel L1 only works for half a power frequency cycle. In another specific embodiment, when the AC power supply Vac 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; and when the AC power supply Vac 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. At this time, lamp panel L1 operates for only half a power frequency cycle.

[0059] In a specific embodiment of the present invention, in the fourth state, neither the motor M nor the lamp panel L1 is working. The lamp panel auxiliary power supply circuit 12 controls the fifth switch Q5 to turn off. The motor control circuit 11 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 one specific embodiment, the motor control circuit 11 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. In another specific embodiment, when the AC power supply Vac is in the positive half-cycle, the motor control circuit 11 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 Vac is in the negative half-cycle, the motor control circuit 11 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.

[0060] In one embodiment of the present invention, such as Figure 4As shown, the auxiliary power supply circuit for the lamp panel also includes a sixth diode D6 and a second capacitor C2. The anode of the sixth diode D6 is coupled to the first terminal of the thyristor T1, the cathode of the sixth diode D6 is coupled to the first terminal of the lamp panel L1, and the second terminal of the lamp panel L1 is coupled to the second output terminal of the motor control circuit 11. The first terminal of the second capacitor C2 is coupled to the cathode of the sixth diode D6, and the second terminal of the second capacitor C2 is coupled to the second terminal of the lamp panel. In the third state, when the motor M is not working and the lamp panel L1 is working, the lamp panel L1 only operates for half a power frequency cycle. The capacitance inside the lamp panel is designed for full-wave rectification. Therefore, when the capacitance inside the lamp panel does not have sufficient margin, the voltage of the lamp panel will be insufficient, resulting in flickering. By adding the second capacitor C2 to compensate for the capacitance, and simultaneously adding the sixth diode D6 to prevent the capacitor from reverse discharging, the flickering problem can be effectively solved.

[0061] In another embodiment of the invention, such as Figure 5 As shown, the thyristor drive circuit also includes a second resistor R2, which is coupled between the fifth diode D5 and the first capacitor C1. The first end of the second resistor R2 is coupled to the cathode of the fifth diode D5, and the second end of the second resistor R2 is coupled to the first end of the first capacitor C1. The thyristor drive circuit adopts the capacitor bootstrap drive principle of the above embodiment. The bootstrap charging cycle of the thyristor drive circuit is the power frequency cycle, and the thyristor operates in the fourth quadrant, resulting in a relatively large gate current. Therefore, the capacitance value of the first capacitor C1, which serves as the bootstrap capacitor, is much larger than that of the capacitor in a conventional half-bridge bootstrap circuit (generally in the tens to hundreds of microfarads range). When the auxiliary power supply Vaux charges the first capacitor C1, there is a large inrush current. Therefore, a second resistor R2 is connected in series with the fifth diode D5 to alleviate this phenomenon and improve the stability of the circuit operation.

[0062] An embodiment of the present invention also discloses a fan light system, which includes a motor, a lamp panel, and a fan light driving circuit as described above. The fan light driving circuit includes a motor control circuit and a lamp panel auxiliary power supply circuit. The first input terminal of the motor control circuit is coupled to the first terminal of an AC power supply, the second input terminal of the motor control circuit is coupled to the second terminal of the AC power supply, the first output terminal of the motor control circuit is coupled to the first terminal of the motor, and the second output terminal of the motor control circuit is coupled to the second terminal of the motor. The voltage at the ground potential terminal of the motor control circuit 11 serves as a reference ground. The motor control circuit includes a chopper circuit, which includes two half-bridges. In a specific embodiment of the present invention, the motor is a single-phase induction motor or other single-phase asynchronous motor after capacitor compensation, and the lamp panel is a lighting subsystem with a driving circuit and lamps.

[0063] An embodiment of the present invention also discloses a control method for a fan light driving circuit. The fan light driving circuit includes a motor control circuit and a lamp panel auxiliary power supply circuit. The lamp panel auxiliary power supply circuit includes a thyristor and a thyristor driving circuit. The thyristor driving circuit includes a fifth switch. The control method includes:

[0064] 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

[0065] 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.

[0066] In one embodiment of the present invention, in the first state, the motor and the lamp panel operate simultaneously; the fifth switch Q5 is turned on; when the AC power supply is in the positive half-cycle, the third switch Q3 and the fourth switch Q4 are turned on, the first switch Q1 switches 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 first switch Q1 and the second switch Q2 are turned on, the third switch Q3 switches 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.

[0067] In one embodiment of the present invention, in the second state, the motor is working and the lamp panel is not working; the fifth switch Q5 is turned off; when the AC power supply is in the positive half-cycle, the third switch Q3 and the fourth switch Q4 are turned on, the first switch Q1 switches 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 first switch Q1 and the second switch Q2 are turned on, the third switch Q3 switches with a first duty cycle, and the switching action of the fourth switch is complementary to the switching action of the third switch.

[0068] 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.

[0069] In one embodiment of the present invention, in the third state, the motor is not working, but the lamp panel is working; the fifth switch Q5 is 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 first switch Q1 and the third switch Q3 are turned off, and the second switch Q2 and the fourth switch Q4 are turned on.

[0070] In another embodiment of the present invention, in the third state, the motor is not working, but the lamp panel is working; the fifth switch Q5 is turned on; and when the AC power supply is in the positive half-cycle, the first switch Q1 is turned off, and the second switch Q2, the third switch Q3 and the fourth switch Q4 are turned on; and when the AC power supply is in the negative half-cycle, the third switch Q3 is turned off, and the first switch Q1, the second switch Q2 and the fourth switch Q4 are turned on.

[0071] In one embodiment of the present invention, in the fourth state, neither the motor nor the lamp panel works; the fifth switch Q5 is turned off; and the first, second, third, and fourth switches are switched on and off to keep the motor in a stopped state. In a specific embodiment, the first switch Q1 and the third switch Q3 are turned off, and the second switch Q2 and the fourth switch Q4 are turned on.

[0072] In another embodiment of the present invention, in the fourth state, neither the motor nor the lamp panel works; the fifth switch Q5 is turned off; and when the AC power supply is in the positive half-cycle, the first switch Q1 is turned off, and the second switch Q2, the third switch Q3 and the fourth switch Q4 are turned on; and when the AC power supply is in the negative half-cycle, the third switch Q3 is turned off, and the first switch Q1, the second switch Q2 and the fourth switch Q4 are turned on.

[0073] The above description and application of the present invention are illustrative and not intended to limit the scope of the invention to the above embodiments. The effects or advantages described in the embodiments may not be apparent in experimental cases due to uncertainties in specific conditions and parameters, and are 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 understood by those skilled in the art that the present 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 driving circuit, characterized by comprising: The fan lamp driving circuit comprises: The motor control circuit has a first input end, a second input end, a first output end, a second output end and a ground potential end; the first input end and the second input end are used to be coupled with an alternating current power supply, and the first output end and the second output end are used to be coupled with a 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 motor control circuit comprises a chopping circuit, and the chopping circuit comprises two half bridges; the chopping circuit comprises a first switch tube, a second switch tube, a third switch tube and a fourth switch tube; the chopping circuit is used to convert alternating current of the alternating current power supply into chopped alternating current; the first switch tube is coupled between the first input end and the first output end of the motor control circuit; the second switch tube is coupled between the first output end and the ground potential end of the motor control circuit; the third switch tube is coupled between the second input end and the second output end of the motor control circuit; the fourth switch tube is coupled between the second output end and the ground potential end of the motor control circuit; and The lamp disc auxiliary power supply circuit is used to control the on-off state of a power supply loop in which the lamp disc is located in cooperation with the motor control circuit; the lamp disc auxiliary power supply circuit comprises a thyristor and a thyristor driving circuit; a first end of the thyristor is used to be coupled with the lamp disc; a second end of the thyristor is coupled with the first input end or the second input end of the motor control circuit; the thyristor driving circuit is coupled with a gate of the thyristor; the thyristor driving circuit comprises an auxiliary power supply, a fifth switch, a first capacitor, a first resistor and a fifth diode; a first end of the fifth switch is coupled with the auxiliary power supply; the fifth switch is used to control the switching state of the thyristor; a first end of the first capacitor is coupled with a second end of the fifth switch; a second end of the first capacitor is coupled with the second end of the thyristor; a first end of the first resistor is coupled with the first end of the first capacitor; a second end of the first resistor is coupled with the gate of the thyristor; the fifth diode is coupled between the auxiliary power supply and the first capacitor; an anode of the fifth diode is coupled with the auxiliary power supply; a cathode of the fifth diode is coupled with the first end of the first capacitor.

2. The fan light drive circuit of claim 1, wherein, The lamp disc auxiliary power supply circuit further comprises: A sixth diode, an anode of which is coupled with the first end of the thyristor, and a cathode of which is used to be coupled with a first end of the lamp disc; and A second capacitor, a first end of which is coupled with the cathode of the sixth diode, and a second end of which is used to be coupled with a second end of the lamp disc.

3. The fan light drive circuit of claim 1, wherein, The thyristor driving circuit further comprises a second resistor, which is coupled between the auxiliary power supply and the first capacitor; a first end of the second resistor is coupled with the auxiliary power supply; a second end of the second resistor is coupled with the first end of the first capacitor.

4. The fan light drive circuit of claim 1, wherein, The fifth switch is a low-voltage transistor or an optical coupler.

5. The fan lamp driving circuit of claim 1, wherein The first switch tube comprises a first body diode in parallel; an anode of the first body diode is coupled with the first output end of the motor control circuit; and a cathode of the first body diode is coupled with the first input end of the motor control circuit. The second switch tube comprises a second body diode in parallel, an anode of the second body diode is coupled to the ground potential, and a cathode of the second body diode is coupled to the first output terminal of the motor control circuit. The third switch tube comprises a third body diode in parallel, an anode of the third body diode is coupled to the second output terminal of the motor control circuit, and a cathode of the third body diode is coupled to the second input terminal of the motor control circuit. The fourth switch tube comprises a fourth body diode in parallel, an anode of the fourth body diode is coupled to the ground potential, and a cathode of the fourth body diode is coupled to the second output terminal of the motor control circuit.

6. The fan lamp driving circuit of claim 1, wherein, in the first state, the motor and the lamp panel work simultaneously, the fifth switch is turned on by the lamp panel auxiliary power supply circuit, and the motor control circuit controls the first switch tube, the second switch tube, the third switch tube and the fourth switch tube to convert the alternating current of the alternating current power supply into chopped alternating current to drive the motor to work.

7. The fan lamp driving circuit of claim 1, wherein, in the second state, the motor works and the lamp panel does not work, the fifth switch is turned off by the lamp panel auxiliary power supply circuit, and the motor control circuit controls the first switch tube, the second switch tube, the third switch tube and the fourth switch tube to convert the alternating current of the alternating current power supply into chopped alternating current to drive the motor to work.

8. The fan lamp driving circuit of claim 1, wherein, in the third state, the motor does not work and the lamp panel works, the fifth switch is turned on by the lamp panel auxiliary power supply circuit, and the motor control circuit controls the first switch tube, the second switch tube, the third switch tube and the fourth switch tube to make the motor in a stop state, and the half-bridge in which the thyristor is located realizes through connection by switching control to supplement the charge of the first capacitor in the thyristor driving circuit.

9. The fan lamp driving circuit of claim 1, wherein, in the fourth state, the motor and the lamp panel do not work, the fifth switch is turned off by the lamp panel auxiliary power supply circuit, and the motor control circuit controls the first switch tube, the second switch tube, the third switch tube and the fourth switch tube to make the motor in a stop state. The fan lamp system comprises a motor, a lamp panel and the fan lamp driving circuit of any one of claims 1-9, a first end of the motor is coupled to the first output terminal of the motor control circuit, a second end of the motor is coupled to the second output terminal of the motor control circuit, and a first end of the lamp panel is coupled to the first end of the thyristor. The fan lamp driving circuit comprises a motor control circuit and a lamp panel auxiliary power supply circuit, the lamp panel auxiliary power supply circuit comprises a thyristor and a thyristor driving circuit, the thyristor driving circuit comprises a fifth switch, and the control method comprises: controlling the on-off state of the power supply loop in which the lamp panel is located by the lamp panel auxiliary power supply circuit and the motor control circuit to control the working state of the lamp panel; and converting the alternating current of the alternating current power supply into chopped alternating current by the motor control circuit and then loading the chopped alternating current to the motor to control the working state of the motor. ​ 10. A fan light system characterized by, ​ 11. A control method for controlling the fan lamp driving circuit according to any one of claims 1 to 9, characterized by, ​ ​ ​

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