Control circuit and damper assembly comprising the same

Abstract

The utility model discloses a control circuit and including the air door subassembly of this control circuit, and this control circuit includes: rectifier circuit is connected to voltage input end to receive input voltage, and exports bus voltage, voltage conversion circuit is connected to rectifier circuit to receive bus voltage, and bus voltage receiving is converted to motor drive voltage, energy storage circuit is connected to rectifier circuit to receive bus voltage and is connected to voltage conversion circuit to store energy, voltage detection circuit is connected to the output of rectifier circuit to detect bus voltage, control unit is connected to voltage detection circuit, and the output motor control signal, motor drive circuit is connected to control unit to receive motor control signal, and the output motor drive signal.

Description

Technical Field

[0001] This utility model relates to a motor control circuit, and more specifically to a motor control circuit for a damper assembly. Background Technology

[0002] In existing ventilation systems, ducts are typically connected to damper assemblies, which play a crucial role in regulating airflow. A traditional damper control technology usually uses a hysteresis motor as a power source, and the damper is opened and closed via a belt and lever or other transmission components. In this structure, a torsion spring or tension spring is installed at the lever position. The purpose of this design is that when the external power is cut off and the hysteresis motor stops working, the transmission components utilize the elastic restoring force of the torsion spring or tension spring to close the damper. This ensures that the ventilation system maintains a certain level of safety and stability during normal operation and in emergencies such as power outages, avoiding a series of problems caused by open dampers, such as airflow turbulence, energy loss, and foreign object entry.

[0003] However, this traditional approach has some inherent drawbacks. First, the hysteresis motor itself has a complex structure, is difficult to manufacture, and is costly. Second, the transmission structure of the hysteresis motor, combined with belts, levers, and torsion springs, is quite complex. The numerous transmission components not only increase the manufacturing cost of the product, but also, during long-term use, are prone to failure due to friction, wear, and mechanical fatigue between the components, reducing the reliability and service life of the system, and also increasing the workload and cost of later maintenance.

[0004] Therefore, there is a need in the field for a damper assembly and its control circuit that is simple in structure, lower in cost, and more stable in operation. Utility Model Content

[0005] In response to the problems and needs mentioned above, this utility model proposes a novel technical solution that solves the above problems and brings other technical effects by adopting the following technical features.

[0006] According to one aspect of the present invention, a control circuit for a damper assembly is provided. The control circuit includes: a rectifier circuit connected to a voltage input terminal to receive an input voltage and output a bus voltage; a voltage conversion circuit connected to the rectifier circuit to receive the bus voltage and convert the received bus voltage into a motor drive voltage; an energy storage circuit connected to the rectifier circuit to receive the bus voltage for energy storage and connected to the voltage conversion circuit; a voltage detection circuit connected to the output terminal of the rectifier circuit to detect the bus voltage; a control unit connected to the voltage detection circuit and outputting a motor control signal; and a motor drive circuit connected to the control unit to receive the motor control signal and output a motor drive signal. When the voltage detection circuit detects that the bus voltage reaches a first predetermined value, the control unit provides a motor control signal to the motor drive circuit, causing the motor of the damper assembly to rotate in a first direction to open the damper assembly.

[0007] According to an embodiment of the present invention, the voltage detection circuit is also connected to the voltage input terminal to detect the input voltage at the voltage input terminal. When the voltage detection circuit detects that there is no input voltage at the voltage input terminal, the energy storage circuit outputs the stored electrical energy to the voltage conversion circuit, and the control unit provides a motor control signal to the motor drive circuit, so that the motor rotates in the second direction to close the damper.

[0008] According to an embodiment of the present invention, after the damper is opened, the control unit outputs a motor control signal that turns on the two-phase coils of the motor to keep the damper open.

[0009] According to an embodiment of the present invention, after the damper is opened, the control unit stops outputting motor control signals, so that the motor maintains the damper in the open state by means of self-positioning torque.

[0010] According to an embodiment of the present invention, the motor drive circuit includes a microstepping drive circuit or a non-microstepping drive circuit.

[0011] According to an embodiment of the present invention, the rectifier circuit includes: a rectifier bridge, a thermistor, a first end of the thermistor connected to a voltage input terminal, a second end of the thermistor connected to the input terminal of the rectifier bridge, and a normally open relay, the first contact and the second contact of the normally open relay being respectively connected to the two ends of the thermistor. When an input voltage is initially provided at the voltage input terminal, the normally open relay is opened, and the bus voltage is output via the thermistor and the rectifier bridge. When the bus voltage reaches a second predetermined value, the control unit outputs a signal to close the normally open relay, and the bus voltage is output only through the rectifier bridge.

[0012] According to an embodiment of the present invention, the signal output by the control unit for closing the normally open relay is input to the motor drive circuit, and the motor drive circuit outputs a relay closing signal to the coil of the normally open relay.

[0013] According to an embodiment of the present invention, the signal output by the control unit for closing the normally open relay is input to the control terminal of the first switching element, the output terminal of the first switching element is grounded, and the relay closing signal is provided to the coil of the normally open relay through the input terminal of the first switching element.

[0014] According to an embodiment of the present invention, the control circuit further includes a step-down circuit, which is connected to a voltage conversion circuit to receive the motor drive voltage and convert the motor drive voltage into a power supply voltage for the control unit.

[0015] According to an embodiment of the present invention, the voltage detection circuit includes a bus voltage detection circuit, wherein the bus voltage detection circuit includes a first resistor and a second resistor connected in series between the bus voltage and ground, and a clamping module, wherein the clamping module includes an anode, a cathode, and a common connection terminal, wherein the connection point between the first resistor and the second resistor is the detection signal output node of the bus voltage detection circuit, and the detection signal output node is connected to the common connection terminal of the control unit and the clamping module.

[0016] According to an embodiment of the present invention, the voltage detection circuit includes an input detection circuit, wherein the input detection circuit includes an optocoupler unit, the two input terminals of the light-emitting side of the optocoupler unit are connected between the two input terminals of the rectifier circuit, and the output terminal of the light-receiving side of the optocoupler unit is connected to the control unit.

[0017] According to an embodiment of the present invention, the voltage conversion circuit includes a second switching element, the input terminal of which is connected to a rectifier circuit to receive the bus voltage, the control terminal of which is connected to a control unit, and the output terminal of which outputs the motor drive voltage.

[0018] According to an embodiment of the present invention, the voltage conversion circuit includes a third resistor and a fourth resistor connected in series between the output terminal of the second switching element and ground. The connection point between the third resistor and the fourth resistor is the output voltage sampling node of the voltage conversion circuit. The output voltage sampling node is connected to the control unit, and the control unit outputs a PWM control signal for the second switching element based on the voltage of the voltage sampling node.

[0019] According to an embodiment of the present invention, the PWM control signal of the second switching element output by the control unit is output to the control terminal of the second switching element through the motor drive circuit.

[0020] According to an embodiment of the present invention, the motor drive circuit is connected to the voltage conversion circuit to receive the motor drive voltage, or connected to the output terminal of the rectifier circuit to receive the bus voltage.

[0021] According to another aspect of the present invention, a damper assembly is provided, including a damper, a motor, and a control circuit according to the present invention.

[0022] The circuit of this invention enables the motor to rotate forward and charge the energy storage circuit when power is on. After power is off, the stored energy in the energy storage circuit, under the control of the control circuit, powers the motor to reverse, thereby closing the damper. This invention uses a simple mechanism and control to achieve rapid, accurate, and smooth movement of the damper in the opening and closing directions, and in particular, it achieves automatic closing of the damper in the event of a power outage. Attached Figure Description

[0023] Figure 1 A perspective view of a damper assembly according to an embodiment of the present invention is shown;

[0024] Figure 2 An exploded view of a damper assembly according to an embodiment of the present invention is shown;

[0025] Figure 3 A block diagram of a control circuit according to an embodiment of the present invention is shown;

[0026] Figure 4 A block diagram of a control circuit according to an embodiment of the present invention is shown;

[0027] Figure 5 A circuit diagram of an input rectifier circuit and an energy storage circuit according to an embodiment of the present invention is shown;

[0028] Figure 6 A schematic diagram of a DC-DC switching power supply step-down circuit according to an embodiment of the present invention is shown;

[0029] Figure 7 A schematic diagram of an LDO step-down circuit according to an embodiment of the present invention is shown;

[0030] Figure 8 A circuit diagram of a relay control circuit according to an embodiment of the present invention is shown;

[0031] Figure 9 This is a circuit diagram of the input detection circuit according to an embodiment of the present invention;

[0032] Figure 10 This is a circuit diagram of a bus voltage detection circuit according to an embodiment of the present invention;

[0033] Figure 11 This is a schematic diagram of a microcontroller unit according to an embodiment of the present invention;

[0034] Figure 12This is a schematic diagram of a motor drive circuit according to an embodiment of the present invention;

[0035] Figure 13 A circuit diagram of a DC-DC switching power supply buck circuit according to another embodiment of the present invention is shown;

[0036] Figure 14 A circuit diagram of a relay control circuit according to another embodiment of the present invention is shown;

[0037] Figure 15 This is a schematic diagram of a microcontroller unit according to another embodiment of the present invention;

[0038] Figure 16 This is a schematic diagram of a motor drive circuit according to another embodiment of the present invention. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. The same reference numerals in the drawings represent the same components. It should be noted that the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0040] Compared to the embodiments shown in the accompanying drawings, feasible embodiments within the scope of protection of this utility model may have fewer components, have other components not shown in the drawings, different components, components arranged differently, or components with different connections, etc. Furthermore, two or more components shown in the drawings may be implemented in a single component, or a single component shown in the drawings may be implemented as multiple separate components.

[0041] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning understood by those skilled in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. When the number of components is not specified, the number of components may be one or more; similarly, terms such as "a," "the," etc., do not necessarily indicate a quantity limitation. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the element or object listed after the word and its equivalents, without excluding other elements or objects. Terms such as "install," "set," "connect," or "link" are not limited to physical or mechanical installation, setting, or connection, but may include electrical installation, setting, or connection, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are only used to indicate the relative positional relationship when the equipment is in use or as shown in the accompanying drawings; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0042] The control circuit of a damper assembly according to the present invention is described below with reference to the accompanying drawings.

[0043] Figure 1-2 A damper assembly according to an embodiment of the utility model is shown, which includes a damper 1 and a damper actuator 2.

[0044] Specifically, the damper 1 has a damper shaft 10 and the damper 1 is rotatable about the damper shaft 10. It should be understood that the damper 1 can be, for example, a circular shape as shown in the figure, or it can be any other suitable shape. The damper shaft 10 can be integrally formed with the damper 1, or it can be a shaft-like component mounted to the damper 1 by any suitable means. When the damper 1 is formed as a circle, the damper shaft 10 can be arranged along the diameter of the damper 1.

[0045] The damper actuator 2 includes: a control circuit electrically connected to a power source (not shown); a motor 3 electrically connected to the control circuit and mounted inside a housing 21, the output shaft 30 of the motor 3 being connected to the damper shaft 10 to drive the damper shaft 10 to rotate; and an energy storage circuit 4 electrically connected to the motor 3 and the control circuit. The control circuit is configured such that, during the damper 1 opening phase, the power source supplies power to the motor 3, causing the motor 3 to drive the damper shaft 10 to rotate in the direction that opens the damper 1, and the power source charges the energy storage circuit 4; during the damper 1 closing phase, the power to the motor 3 is cut off, and the energy storage circuit 4 is controlled to discharge to the motor 3, causing the motor 3 to drive the damper shaft 10 to rotate in the direction that closes the damper 1.

[0046] Preferably, motor 3 is a stepper motor. A stepper motor is an electric motor that converts electrical pulse signals into corresponding angular or linear displacement. Its speed is proportional to the pulse frequency. It has precise step angle control characteristics and can accurately control the opening angle and closing action of the damper. Whether it is opened with power on or closed with power off, it can ensure the high precision of the damper's action, greatly improving the control accuracy and stability of the ventilation system.

[0047] This invention abandons the complex belt and lever transmission and the easily changeable spring structure in the prior art, and adopts a simpler and more direct way of connecting the motor and the damper. This not only reduces the number of parts, lowers manufacturing costs and installation difficulty, but also significantly reduces the number of failure points, improves the reliability and durability of the system, and makes later maintenance more convenient.

[0048] Furthermore, this invention charges the energy storage circuit while the motor is energized and rotating forward. After the motor is powered off, the stored energy in the energy storage circuit powers the motor under the control of the control circuit, enabling the motor to automatically reverse and thus automatically close the damper. This invention uses a simple mechanism and control to achieve rapid and accurate movement of the damper in the opening and closing directions, and in particular, it achieves automatic closure of the damper in the event of a power outage.

[0049] Therefore, this invention overcomes the problems of low energy efficiency, complex structure and high cost in the prior art, and not only maintains low energy consumption but also achieves high control precision.

[0050] Figure 3 A block diagram of a control circuit 300 according to an embodiment of the present invention is shown. The control circuit 300 can implement... Figure 2 The control circuit of the damper driver 2 shown.

[0051] According to an embodiment of the present invention, the control circuit 300 may include a rectifier circuit 310, a voltage conversion circuit 320, an energy storage circuit 330, a voltage detection circuit 340, a control unit 350, and a motor drive circuit 360.

[0052] According to an embodiment of this utility model, the rectifier circuit 310 receives the input voltage from the voltage input terminal and rectifies the input voltage to output the bus voltage. The voltage received at the voltage input terminal can be 24V AC voltage, any suitable DC voltage, etc.

[0053] According to an embodiment of this utility model, the voltage conversion circuit 320 is connected to the rectifier circuit 310 to receive the bus voltage output by the rectifier circuit 310, and converts the received bus voltage into a motor drive voltage for the motor and outputs it. The motor can be... Figure 2 The motor 3 shown. According to an embodiment of this utility model, the motor can be a stepper motor.

[0054] According to an embodiment of the present invention, the energy storage circuit 330 is connected to the rectifier circuit 310 to receive the bus voltage for energy storage, and is also connected to the voltage conversion circuit 320. The energy storage circuit 330 may include one or more capacitors. Here, the energy storage circuit 330 may be... Figure 2 4. Energy storage circuit.

[0055] According to an embodiment of the present invention, the voltage detection circuit 340 is connected to the voltage input terminal and the output terminal of the rectifier circuit 310 to detect the input voltage and bus voltage at the voltage input terminal.

[0056] According to an embodiment of the present invention, the control unit 350 is connected to the voltage detection circuit and outputs a motor control signal based on the detection result of the voltage detection circuit.

[0057] According to an embodiment of this utility model, the motor drive circuit 360 is connected to the voltage conversion circuit 320 to receive the motor drive voltage or to the rectifier circuit to receive the bus voltage, and is also connected to the control unit 350 to receive the motor control signal. The motor drive circuit 360 can output a motor drive signal for driving the motor based on the motor drive voltage and the motor control signal.

[0058] According to an embodiment of the present invention, when the bus voltage is detected to reach a first predetermined value, the control unit 350 provides a motor control signal to the motor drive circuit 360, causing the motor to rotate in a first direction to open the damper.

[0059] When the absence of input voltage is detected at the voltage input terminal, the energy storage circuit 330 outputs the stored electrical energy to the voltage conversion circuit 320, and the control unit 350 provides a motor control signal to the motor drive circuit 360, causing the motor to rotate in a second direction opposite to the first direction to close the damper.

[0060] According to an embodiment of this utility model, after the damper is opened, the control unit 350 stops outputting control signals, and the motor maintains the damper in the open state by using self-positioning torque, thereby reducing energy consumption and heat generation. Alternatively, the control unit 350 outputs control signals to turn on the two-phase coils of the motor, so that the motor locks the phase, thereby maintaining the damper in the open state.

[0061] Figure 4 A block diagram of a control circuit 400 according to an embodiment of the present invention is shown.

[0062] like Figure 4According to an embodiment of the present invention, the control circuit 400 includes: an input rectifier circuit 410, an energy storage circuit 420, a DC-DC switching power supply step-down circuit 430, an LDO step-down circuit 440, an input detection circuit 450, a bus voltage detection circuit 460, a microcontroller unit 470, and a motor drive circuit 480.

[0063] According to an embodiment of this utility model, the input rectifier circuit 410 is connected to the voltage input terminal to receive the input voltage and rectifies the input voltage to output the bus voltage. The input rectifier circuit 410 can be a full-bridge rectifier circuit, a half-bridge rectifier circuit, or a synchronous rectifier circuit.

[0064] According to an embodiment of the present invention, the DC-DC switching power supply step-down circuit 430 is connected to the input rectifier circuit 410 to receive the bus voltage output by the input rectifier circuit 410, and converts the received bus voltage into the motor drive voltage VCC of the motor and outputs it.

[0065] According to an embodiment of the present invention, the energy storage circuit 420 is connected to the input rectifier circuit 410 to receive the bus voltage for energy storage, and is also connected to the DC-DC switching power supply buck circuit 430. Here, the energy storage circuit 420 may include one or more capacitors, and the multiple capacitors may be connected in parallel and / or in series.

[0066] According to an embodiment of the present invention, the LDO step-down circuit 440 is connected to the DC-DC switching power supply step-down circuit 430 to receive the motor drive voltage and convert the motor drive voltage into a power supply voltage VDD for the microcontroller unit 470.

[0067] According to an embodiment of the present invention, the input detection circuit 450 is connected to the voltage input terminal to detect the input voltage of the AC / DC voltage input terminal, and provides the detection result of the input voltage to the microcontroller unit 470.

[0068] According to an embodiment of the present invention, the bus voltage detection circuit 460 is connected to the output terminal of the input rectifier circuit 410 to detect the bus voltage at the output terminal of the input rectifier circuit 410, and provides the detection result of the bus voltage to the microcontroller unit 470.

[0069] According to an embodiment of the present invention, the microcontroller unit 470 receives the detection results from the input detection circuit 450 and the bus voltage detection circuit 460, and outputs the motor control signal of the motor to the motor drive circuit 480 according to the detection results.

[0070] According to an embodiment of the present invention, the motor drive circuit 480 is connected to the DC-DC switching power supply step-down circuit 430 to receive the motor drive voltage VCC, and is connected to the microcontroller unit 470 to receive the motor control signal, and outputs a motor drive signal for driving the motor according to the motor drive voltage and the motor control signal. According to an embodiment of the present invention, the motor can be a stepper motor.

[0071] According to an embodiment of the present invention, when the bus voltage detection circuit 460 detects that the bus voltage has reached a first predetermined value, the microcontroller unit 470 provides a motor control signal to the motor drive circuit 480, causing the motor to rotate in a first direction to open the damper.

[0072] When the input detection circuit 450 detects that there is no input voltage at the voltage input terminal, the energy storage circuit 420 outputs the stored electrical energy to the DC-DC switching power supply step-down circuit 430, and the microcontroller unit 470 provides a motor control signal to the motor drive circuit 480, so that the motor rotates in a second direction opposite to the first direction to close the damper.

[0073] According to an embodiment of this utility model, after the damper is opened, the microcontroller unit 470 stops outputting control signals, and the motor maintains the damper in the open state by using self-positioning torque, thereby reducing energy consumption and heat generation. Alternatively, the microcontroller unit 470 outputs control signals to turn on the two-phase coils of the motor, so that the motor locks the phase, thereby maintaining the damper in the open state.

[0074] Figure 5 A circuit diagram of an input rectifier circuit and an energy storage circuit 500 according to an embodiment of the present invention is shown.

[0075] like Figure 5 According to an embodiment of this utility model, the rectifier circuit and energy storage circuit 500 include a thermistor RT1, a rectifier bridge D1 composed of multiple diodes, and capacitors CE1 and CE2. Thermistor RT1 is connected between the voltage input terminal L1 and the input terminal L2 of rectifier bridge D1, and rectifier bridge D1 outputs a bus voltage +HV. Capacitors CE1 and CE2 are connected in parallel between the output terminal of rectifier bridge D1 and ground. Those skilled in the art will understand that rectifier bridge D1 is merely an example, and this utility model is not limited thereto.

[0076] Figure 6 A schematic diagram of a DC-DC switching power supply buck circuit 600 according to an embodiment of the present invention is shown.

[0077] like Figures 5-6As shown, according to an embodiment of this utility model, the DC-DC switching power supply buck circuit 600 can use a buck converter integrated module U1. The buck converter integrated module U1 receives the bus voltage +HV output by the rectifier circuit and the energy storage circuit 500 and converts it into voltage VCC. Voltage VCC can be the drive voltage of the motor of the damper assembly.

[0078] Figure 7 A schematic diagram of an LDO buck circuit 700 according to an embodiment of the present invention is shown.

[0079] like Figures 5-7 As shown, according to an embodiment of the present invention, the LDO step-down circuit 700 can use a linear regulator integrated circuit U2. The linear regulator integrated circuit U2 can receive voltage VCC and output the power supply voltage VDD used by the microcontroller unit.

[0080] Figure 8 A circuit diagram of a relay control circuit 800 according to an embodiment of the present invention is shown.

[0081] like Figures 5-8 As shown, according to an embodiment of the present invention, the relay control circuit 800 includes a relay K1 and a first switching element Q1. The relay K1 is a normally open relay, with its first contact (3) and second contact (4) connected to the two ends (i.e., L1 and L2) of the thermistor RT1. The control terminal of the first switching element Q1 receives the control signal RELAYC, and the output terminal of the first switching element Q1 is grounded. A relay closing signal for closing the relay K1 is provided to the coil of the relay K1 through the input terminal of the first switching element Q1, for example, by providing it to the coil terminal (e.g., 1) of the relay K1.

[0082] Figure 9 This is a circuit diagram of the input detection circuit 900 according to an embodiment of the present invention.

[0083] like Figures 5-9 As shown, according to an embodiment of the present invention, the input detection circuit 900 includes an optocoupler unit U3. This optocoupler unit U3 can be a bidirectional optocoupler unit, capable of detecting both DC and AC input voltages. The two input terminals on the light-emitting side of the optocoupler unit are respectively connected between the two input terminals L1 and N of the input rectifier circuit 500. One output terminal on the light-receiving side of the optocoupler unit outputs a signal ZERO to the microcontroller unit. According to an embodiment of the present invention, when there is no input voltage at the voltage input terminal L1, the signal ZERO output by the optocoupler unit is high, thereby indicating to the microcontroller unit that the input voltage at the voltage input terminal is absent.

[0084] Figure 10This is a circuit diagram of a bus voltage detection circuit 1000 according to an embodiment of the present invention.

[0085] like Figures 5-10 As shown, according to an embodiment of the present invention, the bus voltage detection circuit 1000 includes multiple resistors R6-R9 connected in series between the bus voltage and ground, and a clamping module D3. The clamping module D3 is composed of two diodes connected in series, with the anode of one diode connected to the cathode of the other. Accordingly, the clamping module D3 includes an anode terminal, a cathode terminal, and a common connection terminal. The connection point between resistors R8 and R9 is the detection signal output node of the bus voltage detection circuit 1000, which outputs a voltage V-BUS to the microcontroller unit. Furthermore, the detection signal output node is connected to the common connection point in the clamping module D3 to limit the voltage of the detection signal output node, thereby protecting the microcontroller unit.

[0086] Figure 11 This is a schematic diagram of a microcontroller unit 1100 according to an embodiment of the present invention.

[0087] like Figures 5-11 As shown, according to an embodiment of the present invention, the microcontroller unit 1100 receives the signal ZERO output from an output terminal of the optocoupler unit U3 on the light-receiving side of the input detection circuit 900, the voltage V-BUS output from the detection signal output node of the bus voltage detection circuit 1000, and the power supply voltage VDD output from the LDO step-down circuit 440.

[0088] According to an embodiment of this utility model, the microcontroller unit outputs a control signal RELAYC to the relay control circuit 800 for closing relay K1 based on the voltage V-BUS output by the detection signal output node of the bus voltage detection circuit 1000. Furthermore, the microcontroller unit 1100 outputs a motor control signal to the motor drive circuit, which may include a motor PWM control signal PWM IN and a motor rotation direction signal DIR. For example, the microcontroller unit 1100 may output the motor control signal based on the signal ZERO output by the input detection circuit 900.

[0089] Figure 12 This is a schematic diagram of a motor drive circuit 1200 according to an embodiment of the present invention.

[0090] like Figures 5-12As shown, according to an embodiment of this utility model, the motor drive circuit 1200 is a microstepping drive circuit. The motor drive circuit 1200 receives the motor PWM control signal PWM IN and the motor rotation direction signal DIR output from the microcontroller unit 1100, as well as the motor drive voltage VCC output from the DC-DC switching power supply buck circuit 600. Furthermore, the motor drive circuit 1200 outputs motor drive signals OA, OB, OC, and OD to the motor based on the motor PWM control signal PWM IN and the motor rotation direction signal DIR.

[0091] refer to Figures 5-12 According to an embodiment of this utility model, when the control circuit is powered on, i.e., after the voltage input terminal receives the input voltage, capacitors CE1 and CE2 are charged through the thermistor RT1 and the rectifier bridge D1. When the bus voltage +HV rises above 12V, the DC-DC switching power supply step-down circuit 600 and the LDO step-down circuit 700 start working, for example, outputting 12V VCC and 5V VDD respectively. At this time, the microcontroller unit 1100 is powered on and initialized. When the microcontroller unit 1100 determines that the bus voltage +HV has risen to a first predetermined value based on the detection result of the bus voltage detection circuit 1000, it outputs a control signal RELAYC to control the relay K1 to close, so that capacitors CE1 and CE2 are not charged through the thermistor RT1 until they are charged to the maximum voltage.

[0092] refer to Figures 5-12 According to an embodiment of this utility model, when the microcontroller unit 1100 determines that the bus voltage has reached its maximum value based on the detection result of the bus voltage detection circuit 1000, it sends a motor PWM control signal PWM IN and a motor rotation direction signal DIR to the motor drive circuit 1200, driving the stepper motor to rotate in the first direction at a first rotational speed, thus opening the damper. When the damper reaches the designated position, the microcontroller unit 1100 stops outputting control signals, and the stepper motor maintains the damper in the open state using a self-positioning torque, thereby reducing energy consumption and heat generation. Alternatively, when the damper reaches the designated position, the microcontroller unit 1100 outputs a control signal to turn on the two-phase coils of the motor, that is, to lock the phase of the motor, thereby maintaining the damper in the open state.

[0093] refer to Figures 5-12 According to an embodiment of the present invention, when the external power supply has been disconnected, that is, when the input detection circuit 900 detects that the input voltage on the voltage input terminal is not present, the microcontroller unit 1100 sends a motor PWM control signal PWM IN and a motor rotation direction signal DIR to the motor drive circuit 1200, driving the stepper motor to rotate in the second direction at a second rotation speed that is the same as or faster than the first rotation speed, so as to close the damper.

[0094] According to an embodiment of this utility model, the motor drive circuit 1200 uses microstepping drive to ensure that the stepper motor runs smoothly and with very little vibration and noise.

[0095] Figure 13 A circuit diagram of a DC-DC switching power supply buck circuit 1300 according to another embodiment of the present invention is shown.

[0096] like Figure 5 , Figure 7 , Figure 9 , Figure 10 and Figure 13 As shown, according to an embodiment of this utility model, the DC-DC switching power supply step-down circuit 1300 may include a switching element Q2. The input terminal of the switching element Q2 is connected to the rectifier circuit to receive the bus voltage +HV. The control terminal of the switching element Q2 receives the control signal DC-DC. The output terminal of the switching element Q2 outputs a voltage VCC, which can be used as a motor drive voltage. Resistors R15 and R16 are connected in series between the output terminal of the switching element Q2 and ground. The connection point between resistors R15 and R16 is the output voltage sampling node of the DC-DC switching power supply step-down circuit 1300. The output voltage sampling node outputs a sampling signal SAMP_12.

[0097] Figure 14 A circuit diagram of a relay control circuit 1400 according to another embodiment of the present invention is shown.

[0098] like Figure 5 , Figure 7 , Figure 9 , Figure 10 , Figure 13 , Figure 14 As shown, according to an embodiment of the present invention, the relay control circuit 1400 includes a relay K2. Relay K2 is a normally open relay, with its first contact (3) and second contact (3) connected to the two ends (L1 and L2) of the thermistor RT1. The coil of relay K2 receives a control signal RELAY for closing relay K2, for example, by providing the control signal RELAY to the coil end of relay K2 (e.g., 1).

[0099] Figure 15 This is a schematic diagram of a microcontroller unit 1500 according to another embodiment of the present invention.

[0100] like Figure 5 , Figure 7 , Figure 9 , Figure 10 , Figures 13-15As shown, according to another embodiment of the present invention, the microcontroller unit 1500 receives the signal ZERO output from an output terminal of the optocoupler unit of the input detection circuit 900, the voltage V-BUS output from the detection signal output node of the bus voltage detection circuit 1000, the sampling signal SAMP_12 output from the output voltage sampling node of the DC-DC switching power supply step-down circuit 1300, and the power supply voltage VDD output from the LDO step-down circuit 440.

[0101] According to another embodiment of the present invention, the microcontroller unit 1500 outputs motor control signals A, B, C, and D. For example, the microcontroller unit 1500 outputs motor control signals A, B, C, and D based on the signal ZERO from the input detection circuit 900. The microcontroller unit 1500 outputs the control signal RELAYC for closing the relay K2 based on the voltage V-BUS output by the detection signal output node of the bus voltage detection circuit 1000. The microcontroller unit 1500 outputs the control signal DC-DC PWM for the switching element Q2 based on the sampling signal SAMP_12 output by the output voltage sampling node, thereby adjusting the output voltage VCC of the DC-DC switching power supply buck circuit 1300.

[0102] Figure 16 This is a schematic diagram of a motor drive circuit 1600 according to another embodiment of the present invention.

[0103] like Figure 5 , Figure 7 , Figure 9 , Figure 10 , Figures 13-16 As shown, according to an embodiment of the present invention, the motor drive circuit 1600 is a non-microstepping stepper drive circuit, such as a Darlington transistor module. According to an embodiment of the present invention, the motor drive circuit 1600 can receive either the bus voltage +HV or the motor drive voltage VCC to drive the motor. When receiving the bus voltage +HV to drive the motor, the losses caused by the step-down circuit can be reduced. The motor drive circuit 1200 receives motor control signals A, B, C, and D, and outputs motor drive signals OA, OB, OC, and OD to the stepper motor.

[0104] Since the motor drive circuit 1600 has remaining drive capability / drive ports, the microcontroller unit 1500 can output a control signal RELAYC for the relay K2 to the motor drive circuit 1600. This allows the motor drive circuit 1600 to output a relay control signal RELAY to the coil of the relay K2, for example, to the coil terminal (1) of K2. The microcontroller unit 1500 can also output a control signal DC-DC PWM for the switching element Q2 to the motor drive circuit 1600. This allows the motor drive circuit 1600 to output a control signal DC-DC to the control terminal of the switching element Q2. Therefore, the relay and switching element do not require additional discrete components for driving.

[0105] Reference Figure 5 , Figure 7 , Figure 9 , Figure 10 , Figures 13-16 According to an embodiment of this utility model, when the control circuit is powered on, that is, after the voltage input terminal receives the input voltage, capacitors CE1 and CE2 are charged through the thermistor RT1 and the rectifier bridge D1. When the bus voltage +HV rises above 6V, the DC-DC switching power supply buck circuit 1300 and the LDO buck circuit 700 start working. At this time, the microcontroller unit 1500 is powered on and initialized. The microcontroller unit 1500 sends the DC-DC PWM control signal of the switching element Q2 to the motor drive circuit 1600 according to the sampling signal SAMP_12 output by the DC-DC switching power supply buck circuit 1300. The motor drive circuit 1600 outputs a DC-DC control signal to the control terminal of the switching element Q2 to control the on and off of Q2 until the 12V voltage output by the DC-DC switching power supply buck circuit 1300 reaches a stable state. Meanwhile, when the microcontroller unit 1500 determines, based on the detection result of the bus voltage detection circuit 1000, that the bus voltage +HV has risen to the second predetermined value, it sends a control signal RELAYC to the relay K2 to the motor drive circuit 1600. The motor drive circuit 1600 outputs a control signal RELAY to the coil of the relay K2 to control the relay K2 to close, so as to continue charging capacitors CE1 and CE2 until the highest voltage.

[0106] Reference Figure 5 , Figure 7 , Figure 9 , Figure 10 , Figures 13-16According to an embodiment of this utility model, when the microcontroller unit 1500 detects that the bus voltage +HV has reached its maximum value, it sends PWM signals A, B, C, and D to the motor drive circuit 1600 to drive the stepper motor to rotate in the first direction at a first rotational speed, thus opening the damper. When the damper reaches the designated position, the microcontroller unit 1500 stops outputting control signals, and the stepper motor maintains the damper in the open state using self-positioning torque, thereby reducing energy consumption and heat generation. Alternatively, when the damper reaches the designated position, the microcontroller unit 1500 outputs control signals to turn on the two-phase coils of the motor, that is, to lock the phase of the motor, thereby maintaining the damper in the open state.

[0107] refer to Figure 5 , Figure 7 , Figure 9 , Figure 10 , Figures 13-16 According to an embodiment of the present invention, when the external power supply has been disconnected, that is, when the input detection circuit 900 detects that the input voltage on the voltage input terminal is not present, the microcontroller unit 1500 sends PWM signals A, B, C, and D to the motor drive circuit 1600 to drive the motor to rotate in the second direction at a second rotation speed that is the same as or faster than the first rotation speed, so as to close the damper.

[0108] According to another embodiment of this utility model, the stepper motor drive circuit adopts a non-microstepping drive module, which is inexpensive. When the bus voltage is lower than 12V, the switching element Q2 is in a fully conducting state, which can greatly improve the utilization rate of the energy stored in the capacitor, thereby reducing the capacitance of the capacitor and lowering the cost.

[0109] The exemplary embodiments of the present invention have been described in detail above with reference to preferred embodiments. However, those skilled in the art will understand that various modifications and alterations can be made to the above specific embodiments without departing from the concept of the present invention, and various combinations can be made to the various technical features and structures proposed by the present invention without exceeding the protection scope of the present invention, which is determined by the appended claims.

Claims

1. A control circuit for a damper assembly, characterized in that, The control circuit includes: The rectifier circuit is connected to the voltage input terminal to receive the input voltage and output the bus voltage. A voltage conversion circuit is connected to the rectifier circuit to receive the bus voltage and convert the received bus voltage into a motor drive voltage; An energy storage circuit is connected to the rectifier circuit to receive the bus voltage for energy storage, and is also connected to the voltage conversion circuit. A voltage detection circuit is connected to the output terminal of the rectifier circuit to detect the bus voltage; The control unit is connected to the voltage detection circuit and outputs motor control signals; A motor drive circuit is connected to the control unit to receive the motor control signal and output the motor drive signal. When the voltage detection circuit detects that the bus voltage reaches a first predetermined value, the control unit provides a motor control signal to the motor drive circuit, causing the motor of the damper assembly to rotate in a first direction to open the damper assembly.

2. The control circuit according to claim 1, characterized in that, The voltage detection circuit is also connected to the voltage input terminal to detect the input voltage at the voltage input terminal. When the voltage detection circuit detects that there is no input voltage at the voltage input terminal, the energy storage circuit outputs the stored electrical energy to the voltage conversion circuit, and the control unit provides a motor control signal to the motor drive circuit, so that the motor rotates in the second direction to close the damper.

3. The control circuit according to claim 2, characterized in that, After the damper is opened, the control unit outputs a motor control signal that turns on the two-phase coils of the motor to keep the damper open.

4. The control circuit according to claim 2, characterized in that, After the damper is opened, the control unit stops outputting motor control signals, so that the motor maintains the damper in the open state with self-positioning torque.

5. The control circuit as described in any one of claims 1-4, characterized in that, The motor drive circuit includes a microstepping drive circuit or a non-microstepping drive circuit.

6. The control circuit according to any one of claims 2-4, characterized in that, The rectifier circuit includes: Rectifier bridge, A thermistor, wherein the first terminal of the thermistor is connected to the voltage input terminal, and the second terminal of the thermistor is connected to the input terminal of the rectifier bridge, and A normally open relay, wherein the first contact and the second contact of the normally open relay are respectively connected to the two ends of the thermistor. in, When an input voltage is initially supplied to the voltage input terminal, the normally open relay opens, and the output bus voltage is supplied via the thermistor and the rectifier bridge. When the bus voltage reaches a second predetermined value, the control unit outputs a signal to close the normally open relay, and outputs the bus voltage only through the rectifier bridge.

7. The control circuit according to claim 6, characterized in that, The control unit outputs a signal for closing the normally open relay, which is then input to the motor drive circuit. The motor drive circuit outputs a relay closing signal to the coil of the normally open relay.

8. The control circuit according to claim 6, characterized in that, The control unit outputs a signal for closing the normally open relay, which is input to the control terminal of the first switching element. The output terminal of the first switching element is grounded, and a relay closing signal is provided to the coil of the normally open relay through the input terminal of the first switching element.

9. The control circuit according to any one of claims 1-4, characterized in that, It also includes a step-down circuit connected to the voltage conversion circuit to receive the motor drive voltage and convert the motor drive voltage into a power supply voltage for the control unit.

10. The control circuit according to any one of claims 1-4, characterized in that, The voltage detection circuit includes a bus voltage detection circuit. The bus voltage detection circuit includes a first resistor and a second resistor connected in series between the bus voltage and ground, as well as a clamping module. The clamping module includes a male terminal, a female terminal, and a common connection terminal. The connection point between the first resistor and the second resistor is the detection signal output node of the bus voltage detection circuit, and the detection signal output node is connected to the common connection terminal of the control unit and the clamping module.

11. The control circuit according to any one of claims 2-4, characterized in that, The voltage detection circuit includes an input detection circuit. The input detection circuit includes an optocoupler unit. The two input terminals of the optocoupler unit on the light-emitting side are connected between the two input terminals of the rectifier circuit, and the output terminal of the optocoupler unit on the light-receiving side is connected to the control unit.

12. The control circuit according to claim 1, characterized in that, The voltage conversion circuit includes a second switching element, the input terminal of which is connected to the rectifier circuit to receive the bus voltage, the control terminal of which is connected to the control unit, and the output terminal of which outputs the motor drive voltage.

13. The control circuit according to claim 12, characterized in that, The voltage conversion circuit further includes a third resistor and a fourth resistor connected in series between the output terminal of the second switching element and ground. The connection point between the third resistor and the fourth resistor is the output voltage sampling node of the voltage conversion circuit. The output voltage sampling node is connected to the control unit, and the control unit outputs the PWM control signal of the second switching element according to the voltage of the voltage sampling node.

14. The control circuit according to claim 13, characterized in that, The PWM control signal of the second switching element output by the control unit is output to the control terminal of the second switching element through the motor drive circuit.

15. The control circuit as described in claim 1, characterized in that, The motor drive circuit is connected to the voltage conversion circuit to receive the motor drive voltage, or connected to the output terminal of the rectifier circuit to receive the bus voltage.

16. A damper assembly, characterized in that, It includes a damper, a motor, and a control circuit as described in any one of claims 1-15.

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