Controllable step-down rectification control circuit and blower device

Abstract

The utility model discloses a controllable step-down rectification control circuit and a blower device. The controllable step-down rectification control circuit comprises a main control module, a power supply module, a step-down rectification filtering control module, a voltage detection module, a zero-cross detection module and a false trigger protection module. The step-down rectification filtering control module is electrically connected with the voltage detection module, the zero-cross detection module and the false trigger protection module. The main control module is electrically connected with the power supply module, the voltage detection module and the zero-cross detection module. The power supply module is electrically connected with the step-down rectification filtering control module and the zero cross detection module. According to the utility model, the function of reducing the voltage VBUS when the 100-240 VAC voltage is input can be realized, and the stable work of the blower is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of hair dryers, in particular to a controllable step-down rectification control circuit and a hair dryer device. Background Art

[0002] The hair dryer is composed of a set of electric heating wires and a high-speed small fan. When powered on, the electric heating wires generate heat, and the wind blown out by the fan passes through the electric heating wires and becomes hot air. If only the small fan rotates and the electric heating wires are not hot, the wind blown out is cool air.

[0003] In the prior art, hair dryer products are divided into 100-120Vac voltage represented by US standard products and 220-240Vac represented by European standard / CCC according to voltage. Products with different voltages cannot be used in other countries. The main reason is that the brushless motor inside the high-speed hair dryer usually has an operating voltage of 155VDC or 310VDC, of ​​which the rated voltage of the 155VDC version is 140-170VDC voltage range, suitable for 100-120Vac input voltage; the rated voltage of the 310VDC version is 280-340VDC voltage range, suitable for 220-240VAC input voltage, so it is not compatible with the wide range of DC voltage 140-340VDC after rectification and filtering from 100-240VAC AC input. Too high or too low voltage will cause the motor to not work stably and normally, and may cause damage. At the same time, the motor control board will also be damaged due to excessive voltage, and cause risks such as fire. In addition, the voltage of each country is different, which limits travelers from carrying their own hair dryer products to other countries. Therefore, inventing a controllable step-down rectifier control circuit and a hair dryer device is an urgent problem to be solved by technicians in this field. Utility Model Content

[0004] The purpose of this application is to provide a controllable step-down rectifier control circuit and a hair dryer device. In this solution, the voltage VBUS step-down function can be realized when the voltage input is 100-240VAC, thereby ensuring the stable operation of the hair dryer. In addition, this application can meet the usage requirements of different scenarios and enhance the user experience.

[0005] In order to solve the above technical problems, the present application provides a controllable buck rectifier control circuit, including a main control module, a power supply module, a buck rectifier filter control module, a voltage detection module, a zero-crossing detection module and a false trigger protection module;

[0006] The step-down rectification and filtering control module is electrically connected to the voltage detection module, the zero-crossing detection module and the false trigger protection module respectively;

[0007] The main control module is electrically connected to the power supply module, the voltage detection module and the zero-crossing detection module respectively;

[0008] The power supply module is electrically connected to the step-down rectification and filtering control module and the zero-crossing detection module respectively.

[0009] Preferably, the controllable buck rectifier control circuit further includes an input voltage indication module;

[0010] The input voltage indication module is electrically connected to the step-down rectification and filtering control module.

[0011] Preferably, the step-down rectification and filtering control module includes an AC input unit, an anti-interference unit, a thyristor control unit and a rectification and filtering unit;

[0012] The AC power input unit is electrically connected to the anti-interference unit, the anti-interference unit is electrically connected to the thyristor control unit and the rectifier and filter unit respectively, the rectifier and filter unit is electrically connected to the voltage detection module, and the anti-interference unit is electrically connected to the zero-crossing detection module and the power supply module respectively.

[0013] Preferably, the thyristor control unit comprises a thyristor, a first resistor and a second resistor;

[0014] The first end of the thyristor is electrically connected to the anti-interference unit and the first end of the first resistor respectively, the second end of the first resistor is electrically connected to the false trigger protection module, the second end of the thyristor is electrically connected to the rectification and filtering unit and the first end of the second resistor respectively, and the third end of the thyristor is electrically connected to the second end of the second resistor and the false trigger protection module respectively.

[0015] Preferably, the false trigger protection module includes an optocoupler isolator, a third resistor and a fourth resistor;

[0016] The first end of the optocoupler isolator is electrically connected to the thyristor control unit, the second end of the optocoupler isolator is electrically connected to the first end of the third resistor, the second end of the third resistor is electrically connected to the thyristor control unit, the third end of the optocoupler isolator is electrically connected to the first end of the fourth resistor, the second end of the fourth resistor is electrically connected to the main control module, and the fourth end of the optocoupler isolator is electrically connected to the input voltage indication module.

[0017] Preferably, the voltage detection module includes an input voltage detection unit and an output voltage detection unit;

[0018] The input voltage detection unit is electrically connected to the power supply module and the main control module respectively, and the output voltage detection unit is electrically connected to the step-down rectification and filtering control module and the main control module respectively.

[0019] Preferably, the input voltage indication module includes a first input voltage indication unit and a second input voltage indication unit;

[0020] The first input voltage indication unit is electrically connected to the power supply module and the step-down rectification and filtering control module respectively;

[0021] The second input voltage indicating unit is electrically connected to the power supply module and the step-down rectification and filtering control module respectively.

[0022] Preferably, the power supply module includes an input processing unit, a step-down conversion unit and an output processing unit;

[0023] The input processing unit is electrically connected to the buck rectifier filter control module and the buck conversion unit respectively, the buck conversion unit is electrically connected to the output processing unit, and the output processing unit is electrically connected to the main control module and the zero-crossing detection module respectively.

[0024] In order to solve the above technical problems, the present application provides a hair dryer device, including the controllable step-down rectifier control circuit.

[0025] A controllable buck rectifier control circuit and a hair dryer device of the utility model have the following beneficial effects. A controllable buck rectifier control circuit disclosed in the utility model includes a main control module, a power supply module, a buck rectifier filter control module, a voltage detection module, a zero-crossing detection module and a false trigger protection module; the buck rectifier filter control module is electrically connected to the voltage detection module, the zero-crossing detection module and the false trigger protection module respectively; the main control module is electrically connected to the power supply module, the voltage detection module and the zero-crossing detection module respectively; the power supply module is electrically connected to the buck rectifier filter control module and the zero-crossing detection module respectively. In the present application, the buck rectifier filter control module can receive an AC input voltage of 100-120VAC or 200-240VAC, and output a VBUS voltage after bucking, rectifying and filtering the AC input voltage of 100-120VAC or 200-240VAC, and cooperates with various functional modules to supply the hair dryer device for use. Therefore, the utility model can realize the voltage VBUS step-down function when the voltage input is 100-240VAC, thereby ensuring the stable operation of the hair dryer; the application also meets the usage requirements of different scenarios and improves the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the utility model will be further described below in conjunction with the accompanying drawings and embodiments. The drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work:

[0027] Figure 1 It is a schematic diagram of the principle of a controllable step-down rectifier control circuit of a preferred embodiment of the utility model;

[0028] Figure 2 It is a schematic diagram of the principle of a controllable step-down rectifier control circuit of a preferred embodiment of the utility model;

[0029] Figure 3 This is a circuit schematic diagram of a step-down rectifier filter control module and a false trigger protection module of a preferred embodiment of the utility model;

[0030] Figure 4 This is a circuit schematic diagram of a voltage detection module of a preferred embodiment of the utility model;

[0031] Figure 5 This is a circuit schematic diagram of an input voltage indication module of a preferred embodiment of the utility model;

[0032] Figure 6 This is a circuit schematic diagram of a power supply module of a preferred embodiment of the utility model;

[0033] Figure 7 This is a circuit schematic diagram of a zero-crossing detection module of a preferred embodiment of the utility model. DETAILED DESCRIPTION

[0034] The core of this application is to provide a controllable step-down rectifier control circuit and a hair dryer device. In this solution, the voltage VBUS step-down function can be realized when the voltage input is 100-240VAC, thereby ensuring the stable operation of the hair dryer. In addition, this application can meet the usage requirements of different scenarios and enhance the user experience.

[0035] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0036] See also Figure 1 , Figure 1A schematic diagram of a controllable buck rectifier control circuit provided in the present application, comprising a main control module 1, a power supply module 2, a buck rectifier filter control module 3, a voltage detection module 4, a zero-crossing detection module 5 and a false trigger protection module 6;

[0037] The step-down rectification and filtering control module 3 is electrically connected to the voltage detection module 4, the zero-crossing detection module 5 and the false trigger protection module 6 respectively;

[0038] The main control module 1 is electrically connected to the power supply module 2, the voltage detection module 4 and the zero-crossing detection module 5 respectively;

[0039] The power supply module 2 is electrically connected to the step-down rectification and filtering control module 3 and the zero-crossing detection module 5 respectively.

[0040] In the existing technology, hair dryers are not compatible with the wide range of DC voltage 140-340VDC after rectification and filtering from 100-240VAC AC input. Too high or too low voltage will cause the motor to not work normally and may cause damage. At the same time, the motor control board will also be damaged due to excessive voltage, which may cause fire and other risks. In addition, the voltage of each country is different, which limits travelers from carrying their own hair dryers to other countries.

[0041] In view of the above shortcomings, in this application, the voltage VBUS step-down function when the voltage input is 100-240VAC is realized through the cooperation of the main control module 1, the power supply module 2, the step-down rectifier filter control module 3, the voltage detection module 4, the zero-crossing detection module 5 and the false trigger protection module 6.

[0042] Specifically, in the present embodiment, the main control module 1 is configured as an MCU (Microcontroller Unit). In another preferred embodiment, the main control module 1 may also be configured as a DSP (Digital Signal Process), an FPGA (Field Programmable Gate Array), a SOC (System On Chip), an ARM (Acorn RISC Machine, a microprocessor), etc., which are not specifically limited herein.

[0043] Specifically, in this embodiment, the buck rectifier filter control module 3 is used to receive an AC input voltage of 100-120VAC or 200-240VAC, and output a VBUS voltage after bucking, rectifying, and filtering the AC input voltage of 100-120VAC or 200-240VAC; the power supply module 2 is used to provide a stable power supply voltage for the main control module 1 and the zero-crossing detection module 5; the false trigger protection module 6 is used to prevent the buck rectifier filter control module 3 from being falsely triggered; the voltage detection module 4 is used to detect the VBUS input voltage and the VBUS output voltage, thereby controlling the output of the buck rectifier filter control module 3 to achieve the purpose of closed-loop feedback; the zero-crossing detection module 5 detects the zero point of the AC mains, and controls the conduction of the buck rectifier filter control module 3 by judging and identifying the zero point position of the mains.

[0044] In summary, the present application provides a controllable buck rectifier control circuit, which includes a main control module 1, a power supply module 2, a buck rectifier filter control module 3, a voltage detection module 4, a zero-crossing detection module 5 and a false trigger protection module 6; the buck rectifier filter control module 3 is electrically connected to the voltage detection module 4, the zero-crossing detection module 5 and the false trigger protection module 6 respectively; the main control module 1 is electrically connected to the power supply module 2, the voltage detection module 4 and the zero-crossing detection module 5 respectively; the power supply module 2 is electrically connected to the buck rectifier filter control module 3 and the zero-crossing detection module 5 respectively. Therefore, the utility model can realize the voltage VBUS step-down function when the voltage input is 100-240VAC, and ensure the stable operation of the hair dryer.

[0045] Based on the above embodiments:

[0046] Please refer to Figure 2 , Figure 2 A schematic diagram of the principle block diagram of a controllable buck rectifier control circuit provided in the present application.

[0047] As a preferred embodiment, a controllable buck rectifier control circuit further includes an input voltage indication module 7;

[0048] The input voltage indicating module 7 is electrically connected to the step-down rectifying and filtering control module 3 .

[0049] Specifically, in this embodiment, the input voltage indicating module 7 is used to indicate that the AC input voltage is 220-240VAC or 100-120VAC.

[0050] Please refer to Figure 3 , Figure 3 A circuit schematic diagram of a buck rectifier filter control module and a false trigger protection module provided in this application.

[0051] As a preferred embodiment, the step-down rectification and filtering control module 3 includes an AC input unit 31, an anti-interference unit 32, a thyristor control unit 33 and a rectification and filtering unit 34;

[0052] The AC input unit 31 is electrically connected to the anti-interference unit 32, the anti-interference unit 32 is electrically connected to the thyristor control unit 33 and the rectifier filter unit 34 respectively, the rectifier filter unit 34 is electrically connected to the voltage detection module 4, and the anti-interference unit 32 is electrically connected to the zero-crossing detection module 5 and the power supply module 2 respectively.

[0053] Specifically, in the present embodiment, when a voltage of 100-120VAC is detected, the thyristor control unit 33 is fully turned on; when a voltage of 200-240VAC is detected, the thyristor control unit 33 is half turned on, so that the AC voltage signal entering the rectifier and filter unit 34 is not full-wave, thereby realizing the step-down function and outputting the VBUS voltage; when a voltage of 120-200VAC is detected, the thyristor control unit 33 is half turned on, so that the AC voltage signal entering the rectifier and filter unit 34 is not full-wave, thereby realizing the step-down function and outputting the VBUS voltage; when a voltage of 240-276VAC is detected, the thyristor control unit 33 is half turned on, so that the AC voltage signal entering the rectifier and filter unit 34 is not full-wave, thereby realizing the step-down function and outputting the VBUS voltage.

[0054] As a preferred embodiment, the thyristor control unit 33 includes a thyristor T1, a first resistor R5 and a second resistor R19;

[0055] The first end of the thyristor T1 is electrically connected to the anti-interference unit 32 and the first end of the first resistor R5, respectively, the second end of the first resistor R5 is electrically connected to the false trigger protection module 6, the second end of the thyristor T1 is electrically connected to the rectification and filtering unit 34 and the first end of the second resistor R19, respectively, and the third end of the thyristor T1 is electrically connected to the second end of the second resistor R19 and the false trigger protection module 6, respectively.

[0056] Specifically, in this embodiment, when a voltage of 100-120VAC is detected, the thyristor T1 is fully open, and the VBUS voltage is equal to (100-120V)*1.414=(140-170)VDC; when a voltage of 200-240VAC is detected, the thyristor T1 is half-conducted, so that the current entering the rectifier bridge BD1 is not full-wave, realizing the step-down function, and outputting the VBUS voltage, the VBUS voltage is equal to 220-240V)*1. 414*X=(140-170)VDC, X is the conduction ratio of the thyristor, which is about 50%; when the voltage of 120-200VAC is detected, the thyristor T1 is half-conducted, so that the current entering the rectifier bridge BD1 is not full-wave, and the step-down function is realized, and the VBUS voltage is output, and the VBUS voltage is equal to (120-200V)*1.414*X=(140-170)VDC, and X is the conduction ratio of the thyristor, which is about 50%-100%. When the voltage of 240-276VAC is detected, the thyristor T1 is half-conducted, so that the current entering the rectifier bridge BD1 is not full-wave, and the step-down function is realized, and the VBUS voltage is output, and the VBUS voltage is equal to (120-200V)*1.414*X=(140-170)VDC, and X is the conduction ratio of the thyristor, which is about 30%-50%.

[0057] As a preferred embodiment, the false trigger protection module 6 includes an optocoupler isolator U1, a third resistor R7 and a fourth resistor R6;

[0058] The first end of the optocoupler isolator U1 is electrically connected to the thyristor control unit 33, the second end of the optocoupler isolator U1 is electrically connected to the first end of the third resistor R7, the second end of the third resistor R7 is electrically connected to the thyristor control unit 33, the third end of the optocoupler isolator U1 is electrically connected to the first end of the fourth resistor R6, the second end of the fourth resistor R6 is electrically connected to the main control module 1, and the fourth end of the optocoupler isolator U1 is electrically connected to the input voltage indication module 7.

[0059] Specifically, in this embodiment, in order to ensure that the thyristor T1 is not triggered by mistake, the thyristor T1 is controlled by dual IO ports, the T_Ctrl1 IO port outputs 5V, and the LED_IO IO port is 0V, thereby ensuring that the optocoupler isolator U1 is triggered normally.

[0060] Please refer to Figure 4 , Figure 4 A circuit schematic diagram of a voltage detection module provided in this application.

[0061] As a preferred embodiment, the voltage detection module 4 includes an input voltage detection unit 41 and an output voltage detection unit 42;

[0062] The input voltage detection unit 41 is electrically connected to the power supply module 2 and the main control module 1 respectively, and the output voltage detection unit 42 is electrically connected to the step-down rectification and filtering control module 3 and the main control module 1 respectively.

[0063] Specifically, in this embodiment, VBUS_IN is the input voltage, which is divided by resistors to obtain VAD_IN, and enters the MCU to realize input voltage detection; VBUS is the output voltage after step-down rectification and filtering, which is divided by resistors to obtain VBUS_AD, and enters the MCU to realize output voltage detection.

[0064] It is worth noting that the present application controls the conduction ratio of the thyristor by detecting and determining the voltage values ​​of VAD_IN and VBUS_AD, and finally realizes the stable output of VBUS.

[0065] Please refer to Figure 5 , Figure 5 A circuit schematic diagram of an input voltage indication module provided in this application.

[0066] As a preferred embodiment, the input voltage indication module 7 includes a first input voltage indication unit 71 and a second input voltage indication unit 72;

[0067] The first input voltage indicating unit 71 is electrically connected to the power supply module 2 and the step-down rectification and filtering control module 3 respectively;

[0068] The second input voltage indicating unit 72 is electrically connected to the power supply module 2 and the step-down rectification and filtering control module 3 respectively.

[0069] Specifically, in this embodiment, when the AC input voltage is 220-240VAC, the indicator light of the first input voltage indicating unit 71 lights up; when the AC input voltage is 100-120VAC, the indicator light of the second input voltage indicating unit 72 lights up.

[0070] Please refer to Figure 6 , Figure 6 A circuit schematic diagram of a power supply module provided in this application.

[0071] As a preferred embodiment, the power supply module 2 includes an input processing unit 21, a step-down conversion unit 22 and an output processing unit 23;

[0072] The input processing unit 21 is electrically connected to the buck rectifier filter control module 3 and the buck conversion unit 22 respectively. The buck conversion unit 22 is electrically connected to the output processing unit 23. The output processing unit 23 is electrically connected to the main control module 1 and the zero-crossing detection module 5 respectively.

[0073] Specifically, in this embodiment, the chip model of the buck conversion unit 22 is set to BP8523D. In another preferred embodiment, the chip model of the buck conversion unit 22 is not specifically limited.

[0074] Please refer to Figure 7 , Figure 7 A circuit schematic diagram of a zero-crossing detection module provided in this application.

[0075] Specifically, the zero-crossing detection module detects the zero point of the AC mains, and controls the conduction ratio of the thyristor T1 by judging and identifying the zero point position of the mains. Therefore, the utility model can accurately control the conduction of the thyristor T1, thereby realizing input and output control of different mains voltage ranges, and ensuring the reliable operation of the hair dryer.

[0076] The present application also provides a hair dryer device, comprising a controllable step-down rectifier control circuit.

[0077] For an introduction to a controllable step-down rectifier control circuit provided in the present application, please refer to the above-mentioned embodiment, and the present application will not go into details here.

[0078] It should be noted that, in this specification, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "includes a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0079] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A controllable step-down rectifier control circuit, characterized in that: It includes a main control module, a power supply module, a step-down rectifier filter control module, a voltage detection module, a zero-crossing detection module and a false trigger protection module; The step-down rectification and filtering control module is electrically connected to the voltage detection module, the zero-crossing detection module and the false trigger protection module respectively; The main control module is electrically connected to the power supply module, the voltage detection module and the zero-crossing detection module respectively; The power supply module is electrically connected to the step-down rectification and filtering control module and the zero-crossing detection module respectively.

2. A controllable step-down rectifier control circuit according to claim 1, characterized in that: The controllable step-down rectifier control circuit further includes an input voltage indication module; The input voltage indication module is electrically connected to the step-down rectification and filtering control module.

3. A controllable step-down rectifier control circuit according to claim 2, characterized in that: The step-down rectification and filtering control module includes an AC input unit, an anti-interference unit, a thyristor control unit and a rectification and filtering unit; The AC power input unit is electrically connected to the anti-interference unit, the anti-interference unit is electrically connected to the thyristor control unit and the rectifier and filter unit respectively, the rectifier and filter unit is electrically connected to the voltage detection module, and the anti-interference unit is electrically connected to the zero-crossing detection module and the power supply module respectively.

4. A controllable step-down rectifier control circuit according to claim 3, characterized in that: The thyristor control unit includes a thyristor, a first resistor and a second resistor; The first end of the thyristor is electrically connected to the anti-interference unit and the first end of the first resistor respectively, the second end of the first resistor is electrically connected to the false trigger protection module, the second end of the thyristor is electrically connected to the rectification and filtering unit and the first end of the second resistor respectively, and the third end of the thyristor is electrically connected to the second end of the second resistor and the false trigger protection module respectively.

5. The controllable step-down rectifier control circuit according to claim 3, characterized in that: The false trigger protection module includes an optocoupler isolator, a third resistor and a fourth resistor; The first end of the optocoupler isolator is electrically connected to the thyristor control unit, the second end of the optocoupler isolator is electrically connected to the first end of the third resistor, the second end of the third resistor is electrically connected to the thyristor control unit, the third end of the optocoupler isolator is electrically connected to the first end of the fourth resistor, the second end of the fourth resistor is electrically connected to the main control module, and the fourth end of the optocoupler isolator is electrically connected to the input voltage indication module.

6. The controllable step-down rectifier control circuit according to claim 1, characterized in that: The voltage detection module includes an input voltage detection unit and an output voltage detection unit; The input voltage detection unit is electrically connected to the power supply module and the main control module respectively, and the output voltage detection unit is electrically connected to the step-down rectification and filtering control module and the main control module respectively.

7. The controllable step-down rectifier control circuit according to claim 2, characterized in that: The input voltage indication module includes a first input voltage indication unit and a second input voltage indication unit; The first input voltage indication unit is electrically connected to the power supply module and the step-down rectification and filtering control module respectively; The second input voltage indicating unit is electrically connected to the power supply module and the step-down rectification and filtering control module respectively.

8. The controllable step-down rectifier control circuit according to claim 1, characterized in that: The power supply module includes an input processing unit, a step-down conversion unit and an output processing unit; The input processing unit is electrically connected to the buck rectifier filter control module and the buck conversion unit respectively, the buck conversion unit is electrically connected to the output processing unit, and the output processing unit is electrically connected to the main control module and the zero-crossing detection module respectively.

9. A hair dryer device, characterized in that: A controllable step-down rectifier control circuit comprising any one of claims 1 to 8.

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