Double-voltage heating wire silicon controlled rectifier series and parallel alternating control circuit

Abstract

The utility model discloses a double-voltage heating wire silicon controlled rectifier series-parallel alternating control circuit, and relates to the technical field of heating wires. According to the circuit provided by the utility model, through the on-off adjustment of the bidirectional silicon controlled rectifier T1, the bidirectional silicon controlled rectifier T2 and the bidirectional silicon controlled rectifier T3, equipment can operate with a quarter of power, a half of power and a full power; the heating wires are controlled by the main control circuit to independently heat or heat in a combined manner; different heating wires are controlled, so that the output power of the heating wires in the heating load circuit is controlled under the condition of two different external voltages, and the practical value is met; double voltages can be used; a finished product manufacturing process is simple in procedure management and control, simple in design and low in cost; two groups of four-wire heating wires with the same resistance are connected in series and in parallel, and the problem that high-power electric appliances generate large current to interfere with components due to overlarge current is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of heating wires, in particular to a dual-voltage heating wire thyristor series-parallel alternating control circuit. Background Art

[0002] With the improvement of people's living standards, hair dryers have become widely used. After washing their hair, people can use hair dryers to quickly dry their hair, reducing the time it takes for it to dry. Hair dryers are also used to assist with hair styling. As a household appliance, hair dryers have greatly facilitated people's lives.

[0003] In the existing technology, the electronic hair dryer uses voltage to control two voltage circuits separately. The two circuits are controlled separately by thyristors to control different voltage heating wires for heating power, and the step-down wire drives the rectifier voltage to control the motor drive circuit. Figure 1 , its working principle is: the driver chip IC turns on / off, and controls the heating wire conversion by controlling the thyristor; Figure 1 In the process, the driver chip IC needs to set the Triac1 and Triac2 pins to control the on / off state. This solution is limited to certain areas and is not convenient for travel. The design cost increases because the voltages of different countries need to be considered, which also complicates the material control cost of the finished product. Utility Model Content

[0004] The purpose of the present invention is to provide a dual-voltage heating wire thyristor series-parallel alternating control circuit to solve the problems raised in the above background technology.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0006] The dual-voltage heating wire thyristor series-parallel alternating control circuit includes a power supply circuit that provides an adaptive power supply, a main control circuit for control, and a first heating wire and a second heating wire that provide heat.

[0007] It also includes a first switch circuit, a second switch circuit, and a third switch circuit that are electrically connected to the main control circuit and controlled by the main control circuit, and the first switch circuit, the second switch circuit, and the third switch circuit are connected in parallel; the first heating wire is connected in parallel to the first switch circuit and the second switch circuit, and the second heating wire is connected in parallel to the second switch circuit and the third switch circuit.

[0008] Preferably, the first switching circuit includes a bidirectional thyristor T1, the second switching circuit includes a bidirectional thyristor T2, and the third switching circuit includes a bidirectional thyristor T3. The bidirectional thyristor T1, bidirectional thyristor T2, and bidirectional thyristor T3 are connected in series in sequence. The first heating wire is connected in parallel to the bidirectional thyristor T1 and the bidirectional thyristor T2; the second heating wire is connected in parallel to the bidirectional thyristor T2 and the bidirectional thyristor T3.

[0009] Preferably, the power supply circuit has a live wire access terminal AC-L and a neutral wire access terminal AC-N; the live wire access terminal AC-L is sequentially connected in series with the main electrode 1 and main electrode 2 of the bidirectional thyristor T1, the main electrode 2 and main electrode 1 of the bidirectional thyristor T2, and the main electrode 1 and main electrode 2 of the bidirectional thyristor T3, and then connected to the neutral wire access terminal AC-N;

[0010] One end of the first heating wire is electrically connected between the live wire input terminal AC-L and the main electrode 1 of the bidirectional thyristor T1, and the other end of the first heating wire is electrically connected between the main electrode 1 of the bidirectional thyristor T2 and the main electrode 1 of the bidirectional thyristor T3. One end of the second heating wire is electrically connected between the main electrode 2 of the bidirectional thyristor T1 and the main electrode 2 of the bidirectional thyristor T2, and the other end of the second heating wire is electrically connected between the main electrode 2 of the bidirectional thyristor T3 and the neutral wire input terminal AC-N; and the connection line between the main electrode 1 of the bidirectional thyristor T2 and the main electrode 1 of the bidirectional thyristor T3 is electrically connected to the second heating wire;

[0011] A grounding process is performed between the main electrode 2 of the bidirectional thyristor T3 and the neutral line access terminal AC-N.

[0012] Preferably, an optical coupler U1 is provided between the bidirectional thyristor T1 and the main control circuit; an optical coupler U2 is provided between the bidirectional thyristor T2 and the main control circuit; and an optical coupler U3 is provided between the bidirectional thyristor T3 and the main control circuit.

[0013] Preferably, the output end of the optocoupler U1 is connected to the control electrode 3 of the bidirectional thyristor T1 after forming a filter circuit through a resistor R23 and a capacitor C6; the output end of the optocoupler U2 is connected to the control electrode 3 of the bidirectional thyristor T2 after forming a filter circuit through a capacitor C7 and a resistor R30; the output end of the optocoupler U3 is connected to the control electrode 3 of the bidirectional thyristor T3 after forming a filter circuit through a capacitor C8 and a resistor R38.

[0014] Preferably, the input end of the optocoupler U1 forms a protection circuit through resistors R19 and R20 and is externally connected to the Triac3 pin of the chip IC1 of the main control circuit; the input end of the optocoupler U2 forms a protection circuit through resistors R29 and R32 and is externally connected to the Triac4 pin of the chip IC1 of the main control circuit; the input end of the optocoupler U3 forms a protection circuit through resistors R36 and R39 and is externally connected to the Triac5 pin of the chip IC1 of the main control circuit.

[0015] Preferably, it also includes a fourth switching circuit, a fifth switching circuit, and a third heating wire and a fourth heating wire that provide heat, which are electrically connected to the main control circuit and controlled by the main control circuit; the third heating wire and the fourth heating wire are connected in series, and the fourth switching circuit and the fifth switching circuit are connected in parallel and connected to the two ends of the fourth heating wire; the fourth switching circuit includes a bidirectional thyristor T4, and the fifth switching circuit includes a bidirectional thyristor T5.

[0016] Preferably, it also includes a motor control circuit, which includes a motor MD1 and a bridge rectifier circuit; the live wire access terminal AC-L of the power supply circuit is electrically connected to the motor MD1 and the third heating wire through the bridge rectifier circuit.

[0017] Preferably, it further includes a key circuit and an indicator light circuit, and the key circuit and the indicator light circuit are both electrically connected to the main control circuit.

[0018] Preferably, it further includes a voltage detection circuit and a zero-crossing trigger circuit, one end of the voltage detection circuit and the zero-crossing trigger circuit is electrically connected to the power supply circuit, and the other end is electrically connected to the main control circuit.

[0019] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0020] The circuit of the present invention enables the device to operate at one-quarter power, one-half power, or full power by adjusting the switches of the first switch circuit, the second switch circuit, and the third switch circuit; each heating wire generates heat individually or in combination under the control of the main control circuit; by controlling different heating wires, the output power of the heating wires in the heating load circuit is controlled under two different external voltages to meet practical value; dual voltage can be used; universal voltage can be used, the process control of the finished product is simple, the design is simple and the cost is low; when the first heating wire and the second heating wire are controlled to work in parallel, they are used in the low voltage range of 100-125V, and when the first heating wire and the second heating wire are connected in series to form group C, they are used in the high voltage range of 220-24 It is used in the 0 voltage area, and the series-parallel mode is used in two groups of 4-wire heating wires with the same resistance value, and the problem of high-power electrical appliances and excessive current generating high-current interference components is solved; when the three bidirectional thyristors open T2, R29 controls the external high-voltage heating, and the bidirectional thyristors bear the load current evenly and are least affected by the current impact. When T1 / T3 is opened, the external low-voltage heating is controlled. The chip adopts a single-line control bidirectional thyristor corresponding voltage opening and closing mode. The same heating wire carries power, and the equal current heating power can be shared by the dual-way bidirectional thyristors using a parallel mode. The two AC voltages can be calculated by the voltage divider identification of the two voltages of R19 and R36, and two AC voltages can be used. The utility model is suitable for hairdressing appliances, such as high-speed hair dryers / electronic hair dryers / curling iron heating wires. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0022] Figure 1 It is the circuit diagram recorded in the background technology of this utility model;

[0023] Figure 2 This is a circuit diagram of the entire utility model;

[0024] Figure 3 This is a circuit diagram of the first mode of the utility model;

[0025] Figure 4 This is a circuit diagram of the second mode of the utility model;

[0026] Figure 5 This is a circuit diagram of the third mode of the utility model;

[0027] Figure 6 This is a circuit diagram of the first switch circuit, the second switch circuit, the third switch circuit, the first heating wire and the second heating wire of the utility model;

[0028] Figure 7 It is a circuit diagram of the power supply circuit of the utility model;

[0029] Figure 8 This is a circuit diagram of the fourth switch circuit, the fifth switch circuit, and the motor control circuit of the present invention;

[0030] Figure 9 This is a circuit diagram of the main control circuit of the utility model;

[0031] Figure 10 This is a circuit diagram of the key circuit of the utility model;

[0032] Figure 11 This is a circuit diagram of the voltage detection circuit and the zero-crossing trigger circuit of the utility model;

[0033] Figure 12 This is a circuit diagram of the indicator light circuit of the utility model;

[0034] Figure 13 It is a circuit diagram of the entire utility model;

[0035] In the figure: 10, power supply circuit; 20, main control circuit; 31, first heating wire; 32, second heating wire; 33, third heating wire; 34, fourth heating wire; 41, first switching circuit; 42, second switching circuit; 43, third switching circuit; 44, fourth switching circuit; 45, fifth switching circuit; 50, motor control circuit; 51, bridge rectifier circuit; 60, button circuit; 70, indicator light circuit; 80, voltage detection circuit; 90, zero-crossing trigger circuit. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0037] like Figure 2As shown, the voltage heating wire thyristor series-parallel alternating control circuit of the utility model includes a power supply circuit 10 for providing an adaptive power supply, a main control circuit 20 for control, and a first heating wire 31 and a second heating wire 32 for providing heat. It also includes a first switch circuit 41, a second switch circuit 42, and a third switch circuit 43 that are electrically connected to the main control circuit 20 and controlled by the main control circuit 20, and the first switch circuit 41, the second switch circuit 42, and the third switch circuit 43 are connected in parallel; the first heating wire 31 is connected in parallel to the first switch circuit 41 and the second switch circuit 42, and the second heating wire 32 is connected in parallel to the second switch circuit 42 and the third switch circuit 43.

[0038] When working, Figure 3-Figure 5 As shown, the first mode: when the first switching circuit 41 controls the first heating wire 31 to be energized, only the first heating wire 31 generates heat, and the second heating wire 32 does not generate heat at this time; the second mode: when the second switching circuit 42 controls the second heating wire 32 to be energized, only the second heating wire 32 generates heat, and the first heating wire 31 does not generate heat at this time; the third mode: the first heating wire 31 and the second heating wire 32 are connected in series, and when the third switching circuit 43 controls the third heating wire 33 to be energized, the first heating wire 31 and the second heating wire 32 generate heat at the same time; and there is also a fourth mode: the first mode and the second mode can exist at the same time, so that the first heating wire 31 and the second heating wire 32 can generate heat independently, so that the heating power is the sum of the heating power of the first heating wire 31 and the second heating wire 32.

[0039] like Figure 6 As shown, the first switch circuit 41 includes a bidirectional thyristor T1, the second switch circuit 42 includes a bidirectional thyristor T2, and the third switch circuit 43 includes a bidirectional thyristor T3. The bidirectional thyristor T1, bidirectional thyristor T2, and bidirectional thyristor T3 are connected in series in sequence. The first heating wire 31 is connected in parallel to the bidirectional thyristor T1 and the bidirectional thyristor T2; the second heating wire 32 is connected in parallel to the bidirectional thyristor T2 and the bidirectional thyristor T3. Through the bidirectional thyristor T1, bidirectional thyristor T2, and bidirectional thyristor T3, the first heating wire 31 and the second heating wire 32 can be heated independently or simultaneously. In addition, when the first heating wire 31 is heated simultaneously, there are two different output powers: parallel heating and series heating.

[0040] like Figure 6 and Figure 7 As shown, the power supply circuit 10 has a live wire input terminal AC-L and a neutral wire input terminal AC-N; the live wire input terminal AC-L is sequentially connected in series with the main electrode 1 and main electrode 2 of the bidirectional thyristor T1, the main electrode 2 and main electrode 1 of the bidirectional thyristor T2, and the main electrode 1 and main electrode 2 of the bidirectional thyristor T3, and then connected to the neutral wire input terminal AC-N;

[0041] One end of the first heating wire 31 is electrically connected between the live wire input terminal AC-L and the main electrode 1 of the bidirectional thyristor T1, and the other end of the first heating wire 31 is electrically connected between the main electrode 1 of the bidirectional thyristor T2 and the main electrode 1 of the bidirectional thyristor T3. One end of the second heating wire 32 is electrically connected between the main electrode 2 of the bidirectional thyristor T1 and the main electrode 2 of the bidirectional thyristor T2, and the other end of the second heating wire 32 is electrically connected between the main electrode 2 of the bidirectional thyristor T3 and the neutral wire input terminal AC-N; and the connection line between the main electrode 1 of the bidirectional thyristor T2 and the main electrode 1 of the bidirectional thyristor T3 is electrically connected to the second heating wire 32.

[0042] The main electrode 2 of the bidirectional thyristor T3 is grounded to the neutral line input terminal AC-N. Therefore, in different on / off states of the bidirectional thyristor T1, the bidirectional thyristor T2, and the bidirectional thyristor T3, current will flow through different heating wires.

[0043] like Figure 6 As shown, in order to further prevent the interference of peaks and surges on the control so as to obtain a smooth control signal after isolation, an optocoupler U1 is provided between the bidirectional thyristor T1 and the main control circuit 20; an optocoupler U2 is provided between the bidirectional thyristor T2 and the main control circuit 20; and an optocoupler U3 is provided between the bidirectional thyristor T3 and the main control circuit 20.

[0044] More specifically, in this embodiment, the output end of the optocoupler U1 is connected to the control electrode 3 of the bidirectional thyristor T1 after forming a filter circuit through the resistor R23 and the capacitor C6; the output end of the optocoupler U2 is connected to the control electrode 3 of the bidirectional thyristor T2 after forming a filter circuit through the capacitor C7 and the resistor R30; the output end of the optocoupler U3 is connected to the control electrode 3 of the bidirectional thyristor T3 after forming a filter circuit through the capacitor C8 and the resistor R38.

[0045] The input end of the optocoupler U1 forms a protection circuit through resistors R19 and R20 and is externally connected to the Triac3 pin of the chip IC1 of the main control circuit 20; the input end of the optocoupler U2 forms a protection circuit through resistors R29 and R32 and is externally connected to the Triac4 pin of the chip IC1 of the main control circuit 20; the input end of the optocoupler U3 forms a protection circuit through resistors R36 and R39 and is externally connected to the Triac5 pin of the chip IC1 of the main control circuit 20.

[0046] like Figure 8As shown, the device further includes a fourth switch circuit 44 and a fifth switch circuit 45 electrically connected to and controlled by the main control circuit 20, and a third heating wire 33 and a fourth heating wire 34 for providing heat. The third heating wire 33 and the fourth heating wire 34 are connected in series, and the fourth switch circuit 44 and the fifth switch circuit 45 are connected in parallel and connected to both ends of the fourth heating wire 34. The fourth switch circuit 44 includes a bidirectional thyristor T4, and the fifth switch circuit 45 includes a bidirectional thyristor T5. Depending on the on / off state of the fourth switch circuit 44 and the fifth switch circuit 45, the third heating wire 33 and the fourth heating wire 34 are controlled to be in different heating states.

[0047] At this time, there is a fifth mode: when the fourth switch circuit 44 controls the third heating wire 33 to be energized, current flows through the third heating wire 33 and generates heat; and there is also a sixth mode: when the fourth switch circuit 44 is disconnected and the fifth switch circuit 45 is closed, current flows through the third heating wire 33 and the fourth heating wire 34 connected in series, and at this time the third heating wire 33 and the fourth heating wire 34 are connected in series to generate heat.

[0048] like Figure 2-13 As shown, the utility model provides a technical solution: a dual-voltage heating wire thyristor series-parallel alternating control circuit, including a power supply circuit 10, a main control circuit 20, a first switch circuit 41, a second switch circuit 42, a third switch circuit 43, a fourth switch circuit 44, a fifth switch circuit 45, and a motor control circuit 50. The power supply circuit 10, the first switch circuit 41, the second switch circuit 42, the third switch circuit 43, the fourth switch circuit 44, the fifth switch circuit 45, and the motor control circuit 50 are all electrically connected to the main control circuit 20 respectively; the first switch circuit 41, the second switch circuit 42, and the third switch circuit 43 are connected in parallel; the main control circuit 20 includes a chip IC1.

[0049] like Figure 9 As shown, the main control circuit 20 includes a chip IC1, the VDD pin of the chip IC1, the capacitor C3 and the GND pin of the chip IC1 are connected in series in sequence, an external 5V terminal is connected between the VDD pin of the chip IC1 and the capacitor C3, and the connection between the capacitor C3 and the GND pin of the chip IC1 is grounded.

[0050] like Figure 6 As shown, the first switch circuit 41 includes an optocoupler U1 and a bidirectional thyristor T1; the second switch circuit 42 includes an optocoupler U2 and a bidirectional thyristor T2; the third switch circuit 43 includes an optocoupler U3 and a bidirectional thyristor T3;

[0051] The live wire access terminal AC-L, the main electrode 1 of the bidirectional thyristor T1, the main electrode 2 of the bidirectional thyristor T1, the main electrode 2 of the bidirectional thyristor T2, the main electrode 1 of the bidirectional thyristor T2, the main electrode 1 of the bidirectional thyristor T3, the main electrode 2 of the bidirectional thyristor T3 and the neutral wire access terminal AC-N are connected in series in sequence;

[0052] One end of the first heating wire 31 is electrically connected between the live wire input terminal AC-L and the main electrode 1 of the bidirectional thyristor T1, and the other end of the first heating wire 31 is electrically connected between the main electrode 1 of the bidirectional thyristor T2 and the main electrode 1 of the bidirectional thyristor T3. One end of the second heating wire 32 is electrically connected between the main electrode 2 of the bidirectional thyristor T1 and the main electrode 2 of the bidirectional thyristor T2, and the other end of the second heating wire 32 is electrically connected between the main electrode 2 of the bidirectional thyristor T3 and the neutral wire input terminal AC-N; and the connection line between the main electrode 1 of the bidirectional thyristor T2 and the main electrode 1 of the bidirectional thyristor T3 is electrically connected to the second heating wire 32.

[0053] Grounding is performed between the main electrode 2 of the bidirectional thyristor T3 and the neutral line access terminal AC-N;

[0054] The four interfaces of the optical coupler U1, the resistor R23, the capacitor C6, and the control electrode 3 of the bidirectional thyristor T1 are connected in series in sequence; the three interfaces of the optical coupler U1 are electrically connected between the main electrode 2 of the bidirectional thyristor T1 and the main electrode 2 of the bidirectional thyristor T2; the four interfaces of the optical coupler U2, the capacitor C7, the resistor R30, and the control electrode 3 of the bidirectional thyristor T2 are connected in series in sequence; the control electrode 3 of the optical coupler U2 is electrically connected between the main electrode 2 of the bidirectional thyristor T1 and the main electrode 2 of the bidirectional thyristor T2; the four interfaces of the optical coupler U3, the capacitor C8, the resistor R38, and the control electrode 3 of the bidirectional thyristor T3 are connected in series in sequence; the control electrode 3 of the optical coupler U3 is electrically connected between the main electrode 2 of the bidirectional thyristor T3 and the neutral line access terminal AC-N;

[0055] Interface 1 of the optocoupler U1 is connected to the Triac3 pin of the external chip IC1 through a resistor R19, and interface 2 of the optocoupler U1 is grounded. Interface 2 of the optocoupler U1 is electrically connected between interface 1 of the optocoupler U1 and resistor R19 through a resistor R20. Main electrode 1 of the optocoupler U2 is connected to the Triac4 pin of the external chip IC1 through a resistor R29, and main electrode 2 of the optocoupler U2 is grounded. Main electrode 2 of the optocoupler U2 is electrically connected between main electrode 1 of the optocoupler U2 and resistor R29 through a resistor R32. Main electrode 1 of the optocoupler U3 is connected to the Triac5 pin of the external chip IC1 through a resistor R36, and main electrode 2 of the optocoupler U3 is grounded. Main electrode 2 of the optocoupler U2 is electrically connected between main electrode 1 of the optocoupler U3 and resistor R36 through a resistor R39.

[0056] like Figure 8 As shown, the fourth switch circuit 44 includes a bidirectional thyristor T4 and a third heating wire 33 connected in series, and the fifth switch circuit 45 includes a bidirectional thyristor T5 and a fourth heating wire 34 connected in series; the third heating wire 33 and the fourth heating wire 34 are connected in series, the bidirectional thyristor T4 and the bidirectional thyristor T5 are connected in parallel, and one end of the third heating wire 33 is connected to the bridge rectifier circuit 51 of the motor control circuit 50; one end of the third heating wire 33 is connected to the bridge rectifier circuit 51 of the motor control circuit 50, and the other end of the third heating wire 33 is connected to the cathode of the bidirectional thyristor T4, and the anode of the bidirectional thyristor T4 is grounded. The control electrode of the bidirectional thyristor T4 is connected to the Triac1 pin of the external chip IC1 through the series resistor R25 and the capacitor C9, and the anode of the bidirectional thyristor T4 is electrically connected between the control electrode of the bidirectional thyristor T4 and the resistor R25 through the resistor R27;

[0057] One end of the fourth heating wire 34 is connected to one end of the third heating wire 33, and the other end of the fourth heating wire 34 is connected to the cathode of the bidirectional thyristor T5. The anode of the bidirectional thyristor T5 is grounded. The control electrode of the bidirectional thyristor T5 is connected to the Triac2 pin of the external chip IC1 through the series resistor R26 and the capacitor C10. The anode of the bidirectional thyristor T5 is electrically connected between the control electrode of the bidirectional thyristor T5 and the resistor R26 through the resistor R28.

[0058] Power is supplied to the third heating wire 33 via the power supply terminal ACL-L through the bridge rectifier circuit 51. Pin Triac1 of the control chip IC1 controls the on / off switching of the bidirectional thyristor T4 to enable or disable the third heating wire 33. Power is supplied to the fourth heating wire 34 via the power supply terminal ACL-L through the bridge rectifier circuit 51 and the third heating wire 33. Pin Triac2 of the control chip IC1 controls the on / off switching of the bidirectional thyristor T5 to enable or disable the fourth heating wire 34. Because the third and fourth heating wires 33 and 34 are connected in series, when the bidirectional thyristor T5 is turned on, the third and fourth heating wires 33 and 34 generate heat simultaneously.

[0059] like Figure 8 As shown, the present invention further includes a motor control circuit 50 , which includes a motor MD1 and a bridge rectifier circuit 51 ; the live wire access terminal AC-L of the power supply circuit 10 is electrically connected to the motor MD1 and the third heating wire 33 via the bridge rectifier circuit 51 .

[0060] The bridge rectifier circuit 51 includes a diode D01, a diode D02, a diode D03, and a diode D04. The connection point 1 between the diode D01 and the diode D02 is electrically connected to the power supply terminal AC-L of the power supply circuit 10, the connection point 4 between the diode D01 and the diode D03 is connected to the negative pole of the motor MD1, the connection point 3 between the diode D02 and the diode D04 is connected to the positive pole of the motor MD1, and the connection point 2 between the diode D03 and the diode D04 is connected to the third heating wire 33; the bridge rectifier circuit 51 realizes DC drive of the motor MD1.

[0061] like Figure 7 As shown, in one embodiment, the power supply circuit 10 includes a live wire input terminal AC-L and a neutral wire input terminal AC-N, a switch OFF / NO, a fuse F1, a diode D1, a resistor R1, a chip IC2, a resistor R2, a capacitor C4, a resistor R7, an electrolytic capacitor EC1, an electrolytic capacitor EC2 and an adjustable resistor VAR1;

[0062] The live wire access terminal AC-L, fuse F1, fuse F2, diode D1, resistor R1 and the Drain pin of the chip IC2 are connected in series in sequence, and the Drain pins of the chip IC2 are connected in parallel; the neutral wire access terminal AC-N is connected in series with the VOUT pin of the chip IC2 through the capacitor C4, and the connection between the neutral wire access terminal AC-N and the capacitor C4 is grounded. The capacitor C4 is connected to the VOUT pin of the chip IC2 with an external 5V terminal, and the outside of the capacitor C4 is connected in parallel with a resistor R2 and an electrolytic capacitor EC1, and the resistor R2 and the electrolytic capacitor EC1 are connected in parallel; the SEL pin of the chip IC2 is electrically connected to the electrolytic capacitor through the resistor R7. Between capacitor EC1 and the neutral line access terminal AC-N, the GND pin of the chip IC2 is electrically connected between the electrolytic capacitor EC1 and the neutral line access terminal AC-N; the VDD pin of the chip IC2 is electrically connected between the electrolytic capacitor EC1 and the neutral line access terminal AC-N through the electrolytic capacitor EC2; the connection between the neutral line access terminal AC-N and the capacitor C4 is externally connected to an adjustable resistor VAR1, a capacitor C2, a resistor R3, a resistor R45 and two reverse-connected diodes D2 and a diode D3; the adjustable resistor VAR1, the capacitor C2, the resistor R3 and the diode D2 are electrically connected between the fuse F1 and the diode D1, and the resistor R3 and the resistor R45 are connected in series;

[0063] Capacitor C2, resistor R3 and two reverse-connected diodes D2 and D3 form a power protection circuit to prevent lightning strikes, overvoltage, interference, and surge power absorption, thus protecting the circuit.

[0064] The power supply terminal AC-L is electrically connected to the fuse F1 to ensure safe operation of the circuit; the voltage passing through the fuse F1, the adjustable resistor VAR1, the resistor R1, and the diode D1 is used by the AC-DC conversion chip IC2.

[0065] like Figure 10 and Figure 12 As shown, in one embodiment, a key circuit 60 and an indicator light circuit 70 are further included. Both the key circuit 60 and the indicator light circuit 70 are electrically connected to the main control circuit 20. The key circuit 60 includes an on / off key OFF / ON and a key COOL. One end of each of the on / off key OFF / ON and the key COOL is grounded, and the other end of the on / off key OFF / ON is connected to the OFF / ON pin of the external chip IC1 via a resistor R44. The other end of the key COOL is connected to the COOL pin of the external chip IC1 via a resistor R14. The key circuit 60 controls the hair dryer.

[0066] The indicator light circuit 70 includes an indicator light LED1, an indicator light LED2, an indicator light LED3 and a resistor R5; the indicator light LED1, the indicator light LED2 and the indicator light LED3 are connected in parallel, and the indicator light LED1, the indicator light LED2 and the indicator light LED3 are electrically connected to the resistor R5 respectively, the resistor R5 is connected to the SEG6 pin of the external chip IC1, the indicator light LED1 is connected to the SEG4 pin of the external chip IC1, the indicator light LED2 is connected to the SEG3 pin of the external chip IC1, and the indicator light LED3 is connected to the SEG5 pin of the external chip IC1; the LED indication circuit is used to indicate information such as the switch status, hot and cold air gears, temperature, and air flow rate.

[0067] like Figure 11 As shown, in one embodiment, it also includes a voltage detection circuit 80 and a zero-crossing trigger circuit 90, one end of the voltage detection circuit 80 and the zero-crossing trigger circuit 90 is electrically connected to the power supply circuit 10, and the other end is electrically connected to the main control circuit 20.

[0068] The voltage detection circuit 80 includes a resistor R4, one end of which is externally connected to the power supply terminal AC-L of the power supply circuit 10, and the other end of which is externally connected to the Vcheck pin of the chip IC1. A resistor R6 and a capacitor C7 are externally connected between the resistor R4 and the Vcheck pin of the chip IC1. The resistor R6 and the capacitor C1 are connected in parallel, and both the resistor R6 and the capacitor C1 are externally connected to the 5V terminal. The zero-crossing trigger circuit 90 includes a resistor R8, one end of which is externally connected to the power supply terminal AC-L of the power supply circuit 10, and the other end of which is externally connected to the Zero pin of the chip IC1. A capacitor C5 is externally connected between the resistor R8 and the Zero pin of the chip IC1, and the capacitor C5 is grounded.

[0069] The voltage detection circuit 80 is used to detect the input voltage of the hair dryer used in this country, and transmits the input voltage value to the main control circuit 20, and then the main control circuit 20 adjusts the operation of different heating wires according to the set mode; the zero-crossing trigger circuit 90 is used for AC load control when the main control circuit 20 controls the control chip IC1. When the voltage detection circuit 80 detects that the voltage exceeds the set value, an interrupt request is generated. Only by sending a trigger pulse at the corresponding trigger pin in the interrupt service program of the main control circuit 20 control chip IC1 can the bidirectional thyristor be triggered to turn on, so as to achieve the effect of different heating wires working individually and / or in combination.

[0070] Specific working principle:

[0071] In the circuit of the present invention, the bidirectional thyristor T1 is controlled by the Triac3 pin of the chip IC1, the bidirectional thyristor T2 is controlled by the Triac4 pin of the chip IC1, and the bidirectional thyristor T3 is controlled by the Triac5 pin of the chip IC1;

[0072] When only the bidirectional thyristor T3 is turned on and the bidirectional thyristor T2 and the bidirectional thyristor T1 are not turned on, the heating wire in the first heating wire 31 heats up alone;

[0073] When only the bidirectional thyristor T1 is turned on and the bidirectional thyristor T2 and the bidirectional thyristor T3 are not turned on, the heating wire in the second heating wire 32 generates heat alone;

[0074] When only the bidirectional thyristor T2 is turned on and the bidirectional thyristor T1 and the bidirectional thyristor T3 are not turned on, the first heating wire 31 and the second heating wire 32 are connected in series to form a heating wire circuit of group C. The two heating wires of the first heating wire 31 and the second heating wire 32 are connected in series to generate heat together.

[0075] When only the bidirectional thyristor T3 and the bidirectional thyristor T1 are turned on and the bidirectional thyristor T2 is not turned on, the first heating wire 31 and the second heating wire 32 are connected in parallel, and the two heating wires of the first heating wire 31 and the second heating wire 32 generate heat in parallel.

[0076] Assume that the maximum heating power is 1000W, and the heating wire resistances of the first heating wire 31 and the second heating wire 32 are equal;

[0077] When the first heating wire 31 or the second heating wire 32 is heating alone, the heating power of the device is 500W;

[0078] The first heating wire 31 and the second heating wire 32 are connected in series. When the two heating wires 31 and 32 are connected in series to generate heat together, the power is 250W.

[0079] The first heating wire 31 and the second heating wire 32 are connected in parallel. When the two heating wires 31 and 32 are connected in parallel to generate heat, the maximum power reaches 1000W.

[0080] By adjusting the opening and closing of the bidirectional thyristor T1, bidirectional thyristor T2 and bidirectional thyristor T3, the device can be operated at one-quarter power, one-half power or full power.

[0081] In different countries, the AC voltage that can be input to the power supply circuit 10 is between 100-240V. The main control circuit 20 controls the first switch circuit 41, the second switch circuit 42, and the third switch circuit 43 to generate heat according to the different input voltages. The fourth switch circuit 44 and the fifth switch circuit 45 control the heating wire to reduce the voltage to supply power to the motor. The heating wire is a resistive load, and its power calculation is mainly determined by the voltage and the resistance of the heating wire. Each heating wire generates heat individually or in combination under the control of the main control circuit 20; by controlling different heating wires, the output power of the heating wire in the heating load circuit is controlled when two different external voltages are reached to meet practical value; dual voltage can be used; it can be used with universal voltage worldwide, and the production process of the finished product is simple to control, with a simple design and low cost;

[0082] Working principle of the circuit: The power supply supplies power to the driver chip IC1 and the control circuit. The chip adopts a single-line communication mode and adopts different external AC power to control A and the second heating wire 32 to achieve two different external voltages. The heating wire power in the heating load circuit is controlled by alternating series and parallel connections to control the output power of the heating wire. After the present invention adopts the above circuit, it can be used in two different AC voltages of 100-240V in the external AC wide voltage. If necessary, Figure 2 The display shows that in actual use, the drive circuit of the utility model is used to control the A and B groups to work in parallel for the low voltage 100-125V voltage area, and the A and B groups are connected in series to form the C group for the high voltage 220-240 voltage area. The two groups of 4 wires and two groups of heating wires with the same resistance value are connected in series and parallel, and the problem of high-power electrical appliances and excessive current generating high-current interference components is solved; when the three bidirectional thyristors turn on T2, R29 controls the external high voltage heating, and the bidirectional thyristors bear the load current evenly and are least affected by the current impact. When T1 / T3 is turned on, the external low voltage heating is controlled. The chip adopts a single-line control bidirectional thyristor corresponding voltage opening and closing method. The same heating wire load power can be shared by the dual-way bidirectional thyristors in parallel. The two AC voltages can be calculated by the voltage divider identification of the two voltages of R19 and R36, and two AC voltages can be used.

[0083] The utility model is suitable for the heating wire of a hairdressing appliance high-speed hair dryer / electronic hair dryer / curling iron.

[0084] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A dual-voltage heating wire thyristor series-parallel alternating control circuit, comprising a power supply circuit (10) for providing an adaptive power supply, a main control circuit (20) for control, and a first heating wire (31) and a second heating wire (32) for providing heat, characterized in that: The invention also includes a first switch circuit (41), a second switch circuit (42), and a third switch circuit (43) electrically connected to the main control circuit (20) and controlled by the main control circuit (20), wherein the first switch circuit (41), the second switch circuit (42), and the third switch circuit (43) are connected in parallel; the first heating wire (31) is connected in parallel to the first switch circuit (41) and the second switch circuit (42), and the second heating wire (32) is connected in parallel to the second switch circuit (42) and the third switch circuit (43).

2. The dual-voltage heating wire thyristor series-parallel alternating control circuit according to claim 1, characterized in that: The first switch circuit (41) includes a bidirectional thyristor T1, the second switch circuit (42) includes a bidirectional thyristor T2, and the third switch circuit (43) includes a bidirectional thyristor T3. The bidirectional thyristor T1, the bidirectional thyristor T2, and the bidirectional thyristor T3 are connected in series in sequence. The first heating wire (31) is connected in parallel to the bidirectional thyristor T1 and the bidirectional thyristor T2; the second heating wire (32) is connected in parallel to the bidirectional thyristor T2 and the bidirectional thyristor T3.

3. The dual-voltage heating wire thyristor series-parallel alternating control circuit according to claim 2, characterized in that: The power supply circuit (10) has a live wire access terminal AC-L and a neutral wire access terminal AC-N; the live wire access terminal AC-L is connected in series with the main electrode 1 and main electrode 2 of the bidirectional thyristor T1, the main electrode 2 and main electrode 1 of the bidirectional thyristor T2, and the main electrode 1 and main electrode 2 of the bidirectional thyristor T3, and then connected to the neutral wire access terminal AC-N; One end of the first heating wire (31) is electrically connected between the live wire access terminal AC-L and the main electrode 1 of the bidirectional thyristor T1, and the other end of the first heating wire (31) is electrically connected between the main electrode 1 of the bidirectional thyristor T2 and the main electrode 1 of the bidirectional thyristor T3. One end of the second heating wire (32) is electrically connected between the main electrode 2 of the bidirectional thyristor T1 and the main electrode 2 of the bidirectional thyristor T2, and the other end of the second heating wire (32) is electrically connected between the main electrode 2 of the bidirectional thyristor T3 and the neutral wire access terminal AC-N; and the connection line between the main electrode 1 of the bidirectional thyristor T2 and the main electrode 1 of the bidirectional thyristor T3 is electrically connected to the second heating wire (32); A grounding process is performed between the main electrode 2 of the bidirectional thyristor T3 and the neutral line access terminal AC-N.

4. The dual-voltage heating wire thyristor series-parallel alternating control circuit according to claim 2, characterized in that: An optical coupler U1 is provided between the bidirectional thyristor T1 and the main control circuit (20); an optical coupler U2 is provided between the bidirectional thyristor T2 and the main control circuit (20); and an optical coupler U3 is provided between the bidirectional thyristor T3 and the main control circuit (20).

5. The dual-voltage heating wire thyristor series-parallel alternating control circuit according to claim 4, characterized in that: The output end of the optocoupler U1 is connected to the control electrode 3 of the bidirectional thyristor T1 after forming a filter circuit through the resistor R23 and the capacitor C6; the output end of the optocoupler U2 is connected to the control electrode 3 of the bidirectional thyristor T2 after forming a filter circuit through the capacitor C7 and the resistor R30; the output end of the optocoupler U3 is connected to the control electrode 3 of the bidirectional thyristor T3 after forming a filter circuit through the capacitor C8 and the resistor R38.

6. The dual-voltage heating wire thyristor series-parallel alternating control circuit according to claim 4 or 5, characterized in that: The input end of the optical coupler U1 forms a protection circuit through resistors R19 and R20 and is externally connected to the Triac3 pin of the chip IC1 of the main control circuit (20); the input end of the optical coupler U2 forms a protection circuit through resistors R29 and R32 and is externally connected to the Triac4 pin of the chip IC1 of the main control circuit (20); the input end of the optical coupler U3 forms a protection circuit through resistors R36 and R39 and is externally connected to the Triac5 pin of the chip IC1 of the main control circuit (20).

7. The dual-voltage heating wire thyristor series-parallel alternating control circuit according to claim 1, characterized in that: The invention also includes a fourth switch circuit (44) and a fifth switch circuit (45) electrically connected to the main control circuit (20) and controlled by the main control circuit (20), and a third heating wire (33) and a fourth heating wire (34) for providing heat; the third heating wire (33) and the fourth heating wire (34) are connected in series, and the fourth switch circuit (44) and the fifth switch circuit (45) are connected in parallel and connected to the two ends of the fourth heating wire (34); the fourth switch circuit (44) includes a bidirectional thyristor T4, and the fifth switch circuit (45) includes a bidirectional thyristor T5.

8. The dual-voltage heating wire thyristor series-parallel alternating control circuit according to claim 7, characterized in that: The motor control circuit (50) further comprises a motor MD1 and a bridge rectifier circuit (51); the live wire access terminal AC-L of the power supply circuit (10) is electrically connected to the motor MD1 and the third heating wire (33) via the bridge rectifier circuit (51).

9. The dual-voltage heating wire thyristor series-parallel alternating control circuit according to claim 1, characterized in that: It also includes a key circuit (60) and an indicator light circuit (70), both of which are electrically connected to the main control circuit (20).

10. The dual-voltage heating wire thyristor series-parallel alternating control circuit according to claim 1, characterized in that: It also includes a voltage detection circuit (80) and a zero-crossing trigger circuit (90), one end of the voltage detection circuit (80) and the zero-crossing trigger circuit (90) being electrically connected to the power supply circuit (10), and the other end being electrically connected to the main control circuit (20).

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