Control circuit

Abstract

The utility model provides a control circuit, which is applied to a clothes airing machine and comprises a rectifier module, a conversion module, a control module, a high-voltage motor drive axle module and a light source module. The rectifier module is used for converting accessed mains supply into direct current and outputting first bus voltage; the conversion module is used for receiving the first bus voltage and converting the first bus voltage into a constant second bus voltage; the control module is connected with the conversion module and is used for receiving the second bus voltage and outputting a PWM signal; the high-voltage motor drive axle module comprises an input end connected with the rectifier module and an output end connected with the control module, the input end is used for receiving the first bus voltage to start the high-voltage motor, and the output end is used for transmitting the output voltage and / or current of the high-voltage motor for the control module to collect; and the light source module is connected with the control module and is used for receiving the PWM signal and adjusting a voltage parameter output to the load according to the PWM signal. Compared with the prior art, the control circuit not only can control the lifting of the clothes airing machine, but also can control the light emitting brightness of the light source module of the clothes airing machine.

Description

Technical Field

[0001] The utility model relates to a control circuit, belonging to the field of electronic circuits. Background Art

[0002] The DC brushless motor has both good speed regulation performance, stable operation and simple control method of DC motors, and also has the advantages of no brushes, small volume and stable operation in relatively harsh environments of AC servo systems. Therefore, it has a wide range of applications in the fields of aerospace, electric vehicles, household appliances, etc.

[0003] When the existing DC brushless motor control is applied to a clothes dryer, it can usually only be used to control the lifting of the clothes dryer, and the function is extremely single.

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

[0005] The purpose of the utility model is to provide a control circuit, which not only has a simple structure, but also can control the light output brightness of the light source module of the clothes dryer while controlling the lifting of the clothes dryer, and has a wider application range.

[0006] To achieve the above purpose, the utility model provides a control circuit, which is applied to a clothes dryer and includes:

[0007] A rectification module, which is used to convert the input mains power into direct current and output a first bus voltage;

[0008] A conversion module, connected to the rectification module, which is used to receive the first bus voltage and convert the first bus voltage into a constant second bus voltage, and the first bus voltage is greater than the second bus voltage;

[0009] A control module, connected to the conversion module, which is used to receive the second bus voltage and output a PWM signal;

[0010] A high-voltage motor drive bridge module, including an input end connected to the rectification module and an output end connected to the control module. The input end is used to receive the first bus voltage to start the high-voltage motor; the output end is used to transmit the output voltage and / or current of the high-voltage motor for the control module to collect; and

[0011] A light source module, connected to the control module, which is used to receive the PWM signal and adjust the voltage parameter output to the load according to the PWM signal.

[0012] As a further improvement of the present utility model, the high-voltage motor is a three-phase motor. The high-voltage motor drive bridge module includes independent U-phase circuit, V-phase circuit, and W-phase circuit. The U-phase circuit, V-phase circuit, and W-phase circuit respectively output their output voltages and / or currents to the control module.

[0013] As a further improvement of the present utility model, a plurality of pins are correspondingly provided on the control module. The plurality of pins are respectively connected to the output ends of the U-phase circuit, V-phase circuit, and W-phase circuit, and sequentially receive the output voltages and / or currents of the U-phase circuit, V-phase circuit, and W-phase circuit.

[0014] As a further improvement of the present utility model, the output end of the high-voltage motor drive bridge module includes a high-voltage output end and a low-voltage output end. Voltage-dividing resistors are connected in series between the high-voltage output end and the control module, and between the low-voltage output end and the control module.

[0015] As a further improvement of the present utility model, the conversion module includes a first conversion circuit and a second conversion circuit connected to each other. The first conversion circuit is connected to the rectification module and is used to convert the first bus voltage output by the rectification module into a constant first drive voltage. The second conversion circuit is used to convert the first drive voltage into a constant second drive voltage, and the value of the second drive voltage is greater than or equal to the value of the second bus voltage.

[0016] As a further improvement of the present utility model, the high-voltage motor drive bridge module further includes a drive voltage input end connected to the first conversion circuit. The drive voltage input end is used to receive the first drive voltage output by the first conversion circuit to drive the operation of the high-voltage motor drive bridge module.

[0017] As a further improvement of the present utility model, a capacitor is connected in parallel between the first conversion circuit and the drive voltage input end. One end of the capacitor is connected to the first conversion circuit, and the other end is grounded.

[0018] As a further improvement of the present utility model, the control module includes a collected voltage input end connected to the conversion module. A first voltage-dividing resistor is connected in series between the collected voltage input end and the conversion module. A second voltage-dividing resistor is connected in parallel between the first voltage-dividing resistor and the collected voltage input end, so that the value of the second bus voltage collected by the control module through the collected voltage input end is always less than the value of the second drive voltage.

[0019] As a further improvement of the present utility model, the control module further includes a function restart end connected to the second conversion circuit. The function restart end is used to receive the second drive voltage output by the second conversion circuit, and a third voltage-dividing resistor is connected in series between the function restart end and the second conversion circuit.

[0020] As a further improvement of the present utility model, the light source module further includes a voltage input terminal connected to the rectification module. The voltage input terminal is used to receive the first bus voltage output by the rectification module and supply power to the load.

[0021] The beneficial effects of the present utility model are as follows: By connecting the output terminal of the high-voltage motor drive bridge module to the control module, the control circuit of the present utility model enables the control module to receive and collect the voltage and / or current output from the output terminal. In this way, the entire control circuit is made simpler. At the same time, by connecting the light source module to the control module, the light source module can receive the PWM signal output by the control module and adjust the parameters of the voltage output to the load according to the received PWM signal, thereby adjusting the brightness of the load. Description of the Drawings

[0022] Figure 1 is a block diagram of the control circuit according to the preferred embodiment of the present utility model.

[0023] Figure 2 is Figure 1 the circuit diagram of the rectification module in

[0024] Figure 3 is Figure 1 the circuit diagram of the conversion module in

[0025] Figure 4 is Figure 1 the circuit diagram of the control module in

[0026] Figure 5 is Figure 1 the circuit diagram of the high-voltage motor drive bridge module in

[0027] Figure 6 is Figure 5 the enlarged circuit diagram of the U-phase circuit in

[0028] Figure 7 is Figure 5 the enlarged circuit diagram of the V-phase circuit in

[0029] Figure 8 is Figure 5 the enlarged circuit diagram of the W-phase circuit in

[0030] Figure 9 is Figure 1 the circuit diagram of the light source module in

[0031] Reference Signs:

[0032] 1 - Rectifier module, 2 - Conversion module, 21 - First conversion circuit, 22 - Second conversion circuit, 3 - Control module, 4 - High - voltage motor drive bridge module, 41 - U - phase circuit, 42 - V - phase circuit, 43 - W - phase circuit, 5 - Light source module, 51 - Light source drive circuit, 52 - Load, a - First drive voltage, b - Second drive voltage, c - Second bus voltage. Detailed implementation

[0033] In order to make the objectives, technical solutions and advantages of the present utility model clearer, the present utility model will be described in detail below with reference to the drawings and specific embodiments.

[0034] The present utility model discloses a control circuit applicable to a clothes dryer. The clothes dryer adopts a DC brushless motor to increase the stability of use.

[0035] Specifically, please refer to Figure 1 As shown, the control circuit includes a rectifier module 1, a conversion module 2, a control module 3, a high - voltage motor drive bridge module 4, and a light source module 5. The control module 3, the high - voltage motor drive bridge module 4, and the light source module 5 operate through the voltages provided by the rectifier module 1 and the conversion module 2 to control the working state of the clothes dryer.

[0036] The rectifier module 1 is used to connect to the mains power and convert the connected mains power into direct current, and this direct current serves as the starting voltage for the high - voltage motor drive bridge module 4 and the light source module 5.

[0037] Please refer to Figure 2 As shown, the rectifier module 1 includes an externally connected live wire N1 and a neutral wire L3. The live wire N1 and the neutral wire L3 are connected in parallel and jointly output the first bus voltage VBUS after passing through the rectifier bridge DB1. A fuse SW1 is connected in series between the neutral wire L3 and the rectifier bridge DB1. One end of the rectifier bridge DB1 outputs the first bus voltage VBUS, and the other end is grounded. The first bus voltage VBUS is preferably a high voltage. In this way, it can ensure the startup of high - voltage modules such as the high - voltage motor drive bridge module 4 and the light source module 5. In this embodiment, the first bus voltage VBUS can be 300v, 310v, 330v, etc., and there is no limitation on this.

[0038] Preferably, the rectifier module 1 is also provided with a filter capacitor EC1 connected in parallel with the rectifier bridge DB1, so that the output of the first bus voltage VBUS is more stable.

[0039] Please refer to Figure 3 As shown, the conversion module 2 includes a first conversion circuit 21 and a second conversion circuit 22 connected to each other. The first conversion circuit 21 is connected to the rectifier module 1 and is used to convert the first bus voltage VBUS output by the rectifier module 1 into a constant first drive voltage a. The second conversion circuit 22 is used to convert the first drive voltage a into a constant second drive voltage b.

[0040] Optionally, the conversion module 2 is preferably a DC-DC circuit for stepping down the first bus voltage VBUS. Therefore, the first driving voltage a is always less than the first bus voltage VBUS, and the second driving voltage b is always less than the first driving voltage a. In this way, the high voltage is converted into a low voltage to adapt to subsequent low-voltage control chips, etc. Generally speaking, the voltage that the chip can withstand is between 2V and 5V. Therefore, the second driving voltage b and the second bus voltage c can be 3V, 3.3V, etc., and there is no limitation on this. Since the value of the first bus voltage VBUS and the value of the second bus voltage c differ greatly, the first driving voltage a is used for transfer. The first driving voltage a can be preferably 12V.

[0041] Optionally, the first driving voltage a is used to drive the high-voltage motor drive bridge module 4 to work, and the second driving voltage b is used to drive the control module 3 to work. The second transfer circuit 22 also outputs the converted second bus voltage c to the control module 3 at the same time. Generally speaking, the value of the second driving voltage b is equal to the value of the second bus voltage c. However, when a voltage-dividing resistor is provided between the second conversion circuit 22 and the control module 3, the value of the second bus voltage c will be less than the value of the second driving voltage b. Therefore, the value of the second driving voltage b is always greater than or equal to the value of the second bus voltage c.

[0042] Please refer to Figure 4 As shown, the control module 3 includes a control chip U1, and the control chip U1 includes a first voltage input terminal AVDD connected to the conversion module 2. The first voltage input terminal AVDD is used to receive the second driving voltage b output by the conversion module 2 to start the control chip U1. A capacitor C4 is connected in parallel between the conversion module 2 and the first voltage input terminal AVDD to filter the second driving voltage b. One end of the capacitor C4 is connected to the first voltage input terminal AVDD, and the other end is grounded.

[0043] The control module 3 further includes an acquisition voltage input terminal P2.7 connected to the conversion module 2. A first voltage-dividing resistor R3 is connected in series between the acquisition voltage input terminal P2.7 and the conversion module 2, and a second voltage-dividing resistor R5 is connected in parallel between the first voltage-dividing resistor R3 and the acquisition voltage input terminal P2.7. Due to the existence of the first voltage-dividing resistor R3 and the second voltage-dividing resistor R5, the value of the second bus voltage c collected by the control module 3 through the acquisition voltage input terminal P2.7 is always less than the value of the second driving voltage b, ensuring that the control chip U1 can operate / work normally.

[0044] The control module 3 is also integrated with a comparison module, in which a preset range of the bus voltage is preset. By comparing the value c of the second bus voltage collected by the acquisition voltage input terminal P2.7 with the preset range of the bus voltage, it is ensured that the value of the second bus voltage c collected is always within the preset range of the bus voltage, thereby ensuring the stable operation of the control chip U1.

[0045] The control module 3 is also provided with a plurality of acquisition terminals, including a first high-voltage acquisition input terminal P1.4, a first low-voltage acquisition input terminal P1.5, a second high-voltage acquisition input terminal P1.6, a second low-voltage acquisition input terminal P1.7, a third high-voltage acquisition input terminal P1.8, a third low-voltage acquisition input terminal P1.9, a first current acquisition input terminal P3.10, a second current acquisition input terminal P3.11, a third current acquisition input terminal P3.14, and a fourth current acquisition input terminal P3.15. These acquisition terminals are respectively used to acquire the data of the voltage and current output by the high-voltage motor drive bridge module 4.

[0046] In this embodiment, the plurality of acquisition terminals acquire data in a preset order, and when all acquisitions are completed, it is counted as one round. Each time a round of acquisition is completed, it is accumulated inside the control chip U1 until the acquisition stops.

[0047] When the control circuit of the present utility model is used in a clothes dryer, it will drive the gear to rotate through the forward and reverse rotation of the high-voltage motor to control the lifting of the clothes dryer. Therefore, by setting the time for the control chip U1 to acquire one round as the time for the small gear to rotate one week, and then according to the circumference of the gear and the number of acquisition rounds, the rising or falling distance of the clothes dryer can be obtained. Considering the acquisition duration and facilitating the realization of this effect, the gears can be a large gear and a small gear that mesh with each other. Presetting the circumference ratio of the large gear and the small gear and making the time for controlling one round of acquisition the same as the time for the small gear to rotate one circle can achieve this technical effect.

[0048] Inside the control chip U1, preset values corresponding to each acquisition terminal are also respectively preset. When each acquisition terminal acquires the data of the voltage and current output by the high-voltage motor drive bridge module 4, as long as the data obtained by one acquisition port is different from the preset value, it can be determined whether the current clothes dryer is overloaded or encounters resistance. Subsequently, the working state of the high-voltage motor can be controlled by means of restarting or stopping the operation, etc.

[0049] For example, the current signal generated by the high-voltage motor drive bridge circuit 4 is converted from an analog signal to a digital signal through the A / D converter integrated in the control chip U1, and is compared with a preset value inside the control chip U1 through the digital signal. Multiple preset values can be set. When it is greater than a certain preset value, the digital signal is an overload signal. When it is greater than another preset value, the digital signal is a signal indicating encountering an obstacle. In this way, it can be judged that the clothes dryer has an overload or an obstacle encounter situation, and then the control chip U1 controls the high-voltage motor to stop rotating to prevent accidents from occurring.

[0050] The control chip U1 also has a function restart terminal RSTN connected to the conversion module 2. The function restart terminal RSTN is used to receive the second driving voltage b output by the conversion module 2, and a third voltage-dividing resistor R4 is connected in series between the function restart terminal RSTN and the conversion module 2. The function restart terminal RSTN can be used to restart the control chip U1. A capacitor C5 is also connected in parallel between the third voltage-dividing resistor R4 and the function restart terminal RSTN. One end of the capacitor C5 is connected to the function restart terminal RSTN, and the other end is grounded.

[0051] The control chip U1 also has a hardware overcurrent protection terminal TIM0. The hardware overcurrent protection terminal TIM0 is connected in series with the voltage-dividing resistor R1 to virtually ground. A capacitor C1 is also connected in parallel between the hardware overcurrent protection terminal TIM0 and the voltage-dividing resistor R1. One end of the capacitor C1 is connected to the hardware overcurrent protection terminal TIM0, and the other end is grounded. The grounded end of the capacitor C1 and the virtually grounded end of the voltage-dividing resistor R1 are connected in parallel with a voltage-dividing resistor R2. In this way, by setting double grounding, it can play a protective role when the voltage or current is overcurrent.

[0052] The control chip U1 also has a signal output terminal LED-PWM. The signal output terminal LED-PWM is used to output a PWM signal to the light source module 5 to control the light output brightness of the light source module 5.

[0053] Please refer to Figures 5 - 8 As shown, the high-voltage motor drive bridge module 4 includes an input terminal P connected to the rectification module 1 and an output terminal connected to the control module 3. The input terminal P is used to receive the first bus voltage VBUS output by the rectification module 1, and the output terminal is used to output the output voltage and / or current for the control module 3 to collect.

[0054] In this embodiment, the high-voltage motor is a three-phase motor. The high-voltage motor drive bridge module 4 includes independent and basically identical U-phase circuit 41, V-phase circuit 42, and W-phase circuit 43. The U-phase circuit 41, V-phase circuit 42, and W-phase circuit 43 respectively output their own output voltage and / or current to the control module 3.

[0055] The high-voltage motor drive bridge module 4 includes a drive voltage input terminal VCC connected to the conversion module 2. This drive voltage input terminal VCC is used to receive the first drive voltage a output by the conversion module 2. In this embodiment, the first bus voltage VBUS received by the input terminal P enables the high-voltage motor drive bridge module 4 to start, and the first drive voltage a received by the drive voltage input terminal VCC can drive the high-voltage motor drive bridge module 4 to operate.

[0056] A capacitor C11 is connected in parallel between the conversion module 2 and the drive voltage input terminal VCC. This capacitor C11 is used to filter the first drive voltage a input to the drive voltage input terminal VCC to make it more stable. One end of the capacitor C11 is connected to the conversion module 2, and the other end is grounded.

[0057] The U-phase circuit 41, the V-phase circuit 42, and the W-phase circuit 43 are all provided with a high-voltage output terminal HIN and a low-voltage output terminal LIN connected to the control module 3. Voltage-dividing resistors are connected in series between the high-voltage output terminal HIN and the control module 3, and between the low-voltage output terminal LIN and the control module 3. By setting the high-voltage output terminal HIN and the low-voltage output terminal LIN, high voltage and low voltage are output separately and collected individually. In this way, it is more convenient for the comparison of the control chip U1.

[0058] The U-phase circuit 41, the V-phase circuit 42, and the W-phase circuit 43 are each provided with two current output terminals N. One of the current output terminals N is used to output current to the control module 3, and the other current output terminal N is used to ground.

[0059] Please refer to Figure 9 As shown, the light source module 5 includes a light source drive circuit 51 and a load 52. The light source drive circuit 51 is provided with a voltage input terminal connected to the rectification module 1. This voltage input terminal is used to receive the first bus voltage VBUS output by the rectification module 1 and output voltage to the load 52.

[0060] In this embodiment, the load 52 is preferably a lamp bead. After the voltage input terminal of the light source drive circuit 51 outputs voltage to the load 52, the load 52 can emit light.

[0061] The light source drive circuit 51 further includes a signal input terminal connected to the control module 3. This signal input terminal is used to receive the PWM signal output by the control module 3 and adjust the parameters of the voltage output to the load 52 according to the PWM signal, so as to change the light emission brightness of the load 52.

[0062] In summary, the control circuit of the present utility model connects the output end of the high-voltage motor drive bridge module 4 to the control module 3, enabling the control module 3 to receive and collect the voltage and / or current output from the output end. Thus, the entire control circuit becomes simpler. At the same time, by connecting the light source module 5 to the control module 3, the light source module 5 can receive the PWM signal output by the control module 3 and adjust the parameters of the voltage output to the load 52 according to the received PWM signal, thereby adjusting the light output brightness of the load 52.

[0063] The above embodiments are only used to illustrate the technical solutions of the present utility model and not to limit them. Although the present utility model has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present utility model can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present utility model.

Claims

1. A control circuit, applied to a clothes drying machine, characterized in that: The control circuit comprises: A rectifier module (1) is used to convert the incoming mains electricity into direct current and output a first bus voltage; A conversion module (2), connected to the rectifier module (1), configured to receive the first bus voltage and convert the first bus voltage into a constant second bus voltage, wherein the first bus voltage is greater than the second bus voltage; A control module (3), connected to the conversion module (2), configured to receive the second bus voltage and output a PWM signal; A high-voltage motor drive bridge module (4), comprising an input end connected to the rectifier module (1) and an output end connected to the control module (3), wherein the input end is used to receive the first bus voltage to start the high-voltage motor; and the output end is used to transmit the output voltage and / or current of the high-voltage motor for collection by the control module (3); and The light source module (5) is connected to the control module (3) and is used to receive the PWM signal and adjust the voltage parameters output to the load (52) according to the PWM signal.

2. The control circuit according to claim 1, characterized in that: The high-voltage motor is a three-phase motor, and the high-voltage motor drive bridge module (4) comprises a U-phase circuit (41), a V-phase circuit (42), and a W-phase circuit (43) that are independent of each other. The U-phase circuit (41), the V-phase circuit (42), and the W-phase circuit (43) respectively output their own output voltage and / or current to the control module (3).

3. The control circuit according to claim 2, characterized in that: The control module (3) is provided with a plurality of pins correspondingly, the plurality of pins being respectively connected to the output ends of the U-phase circuit (41), the V-phase circuit (42) and the W-phase circuit (43), and receiving the output voltage and / or current of the U-phase circuit (41), the V-phase circuit (42) and the W-phase circuit (43) in sequence.

4. The control circuit according to claim 1, characterized in that: The output end of the high-voltage motor drive bridge module (4) comprises a high-voltage output end and a low-voltage output end, and a voltage dividing resistor is connected in series between the high-voltage output end and the control module (3), and between the low-voltage output end and the control module (3).

5. The control circuit according to claim 1, characterized in that: The conversion module (2) comprises a first conversion circuit (21) and a second conversion circuit (22) which are connected to each other, wherein the first conversion circuit (21) is connected to the rectifier module (1) and is used to convert a first bus voltage output by the rectifier module (1) into a constant first drive voltage, and the second conversion circuit (22) is used to convert the first drive voltage into a constant second drive voltage, wherein the value of the second drive voltage is greater than or equal to the value of the second bus voltage.

6. The control circuit according to claim 5, characterized in that: The high-voltage motor drive bridge module (4) further comprises a drive voltage input terminal connected to the first conversion circuit (21), wherein the drive voltage input terminal is used to receive a first drive voltage output by the first conversion circuit (21) to drive the high-voltage motor drive bridge module (4) to operate.

7. The control circuit according to claim 6, characterized in that: A capacitor is connected in parallel between the first conversion circuit (21) and the driving voltage input terminal, one end of the capacitor is connected to the first conversion circuit (21), and the other end is grounded.

8. The control circuit according to claim 5, characterized in that: The control module (3) comprises a voltage collection input terminal connected to the conversion module (2), a first voltage-dividing resistor being connected in series between the voltage collection input terminal and the conversion module (2), and a second voltage-dividing resistor being connected in parallel between the first voltage-dividing resistor and the voltage collection input terminal, so that the value of the second bus voltage collected by the control module (3) through the voltage collection input terminal is always smaller than the value of the second drive voltage.

9. The control circuit according to claim 5, characterized in that: The control module (3) further comprises a function restart terminal connected to the second conversion circuit (22), the function restart terminal being used to receive the second drive voltage output by the second conversion circuit (22), and a third voltage-dividing resistor being connected in series between the function restart terminal and the conversion module (2).

10. The control circuit according to claim 1, characterized in that: The light source module (5) further comprises a voltage input terminal connected to the rectifier module (1), the voltage input terminal being used to receive a first bus voltage output by the rectifier module (1) to supply power to the load (52).

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