Multi-power garment steamer control circuit based on MCU and multi-power garment steamer

Abstract

The utility model provides an MCU-based multi-power garment steamer control circuit and a multi-power garment steamer, the MCU-based multi-power garment steamer control circuit comprises a power switch, a load circuit, a bridge rectifier module and an MCU control circuit, the power switch is connected with the load circuit, the load circuit comprises a first branch circuit and a second branch circuit which are connected in parallel, the first branch circuit is connected in series with a water supply part, and the second branch circuit is connected in series with a water supply part; the second branch is connected with a bridge rectifier module and a heating part, the load circuit is connected with the MCU control circuit, the MCU control circuit is connected with the bridge rectifier module to form the MCU-based multi-power garment steamer control circuit, and the MCU control circuit is used for determining whether to disconnect the load circuit or not according to whether a detected high-voltage signal exceeds a set threshold value or not. Normal work of the multi-power-supply garment steamer under different power supply voltages is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of garment steamer design, and in particular to an MCU-based multi-power garment steamer control circuit and a multi-power garment steamer. Background Art

[0002] A garment steamer is a household appliance used for ironing clothes. It helps remove wrinkles from clothes by generating hot steam or hot air, making clothes look neater. The voltage of AC power supply in the world is distributed in two sections: 100V-120V or 220V-240V. For example, Asia, Europe and other regions use 220V AC with a frequency of 50 Hz, while North America, Japan and other regions use 110V AC with a frequency of 60 Hz.

[0003] In today's globalized world, manufacturers need to design garment steamers that can adapt to these two different voltages and improve the applicability of garment steamers in different power supply voltage environments. However, it is obviously inappropriate to design garment steamers with components of different rated working voltages for different power supply voltage environments. This will not only increase the design cost, but also the product is corresponding to one of the power supply voltage environments, and the same garment steamer cannot adapt to two different power supply voltage environments at the same time. Utility Model Content

[0004] The purpose of the embodiments of the present application is to provide a multi-power supply garment steamer control circuit and a multi-power supply garment steamer based on an MCU to adapt to different power supply voltages and improve the applicability of the garment steamer in different power supply voltage environments.

[0005] In order to achieve the above purpose, the embodiments of the present application are implemented in the following manner:

[0006] In the first aspect, an embodiment of the present application provides a multi-power supply garment steamer control circuit based on MCU, including a power switch, a load circuit, a bridge rectifier module and an MCU control circuit, the power switch is connected to the load circuit, the load circuit includes a first branch and a second branch in parallel, the water supply part is connected in series on the first branch, the bridge rectifier module and the heating part are connected on the second branch, the load circuit is connected to the MCU control circuit, and the MCU control circuit is connected to the bridge rectifier module to form a multi-power supply garment steamer control circuit based on MCU, wherein the MCU control circuit is used to determine whether to disconnect the load circuit according to whether the detected high-voltage signal exceeds a set threshold value, so as to realize the normal operation of the multi-power supply garment steamer under different power supply voltages.

[0007] In combination with the first aspect, in a first possible implementation of the first aspect, the MCU-based multi-power garment steamer control circuit also includes a power connector, and the power connector includes a first contact piece and a second contact piece; the first contact piece is connected in series with the power switch, and the second contact piece is connected to the bridge rectifier module.

[0008] In combination with the first possible implementation manner of the first aspect, in a second possible implementation manner of the first aspect, the bridge rectifier module includes 4 diodes and has two power connection terminals and two load connection terminals, the power switch is connected between the first contact piece and the first power connection terminal, and the second contact piece is connected to the second power connection terminal; the MCU control circuit is connected between the first load connection terminal and the second load connection terminal; the heating part is connected between the first load connection terminal and the MCU control circuit.

[0009] In combination with the second possible implementation manner of the first aspect, in a third possible implementation manner of the first aspect, the MCU control circuit includes an MCU controller, a DC high-voltage detection circuit, a power supply circuit, a switch control circuit and a diode, a diode is connected in series to the first load connection end of the bridge rectifier module, the diode is connected to the DC high-voltage detection circuit, and the DC high-voltage detection circuit is connected to the MCU controller to detect the high-voltage signal after rectification of the working voltage; the power supply circuit is connected to the MCU controller to power the MCU controller; the MCU controller is used to generate a corresponding control signal according to a comparison result between the detected high-voltage signal and a set threshold value, when the high-voltage signal exceeds the set threshold value, the control signal is disconnected, and when the high-voltage signal does not exceed the set threshold value, the control signal is connected; the switch control circuit is connected to the MCU controller, and is connected between the load circuit and the second load connection end of the bridge rectifier module, and is used to realize the connection and disconnection between the load circuit and the second load connection end of the bridge rectifier module according to the control signal of the MCU controller.

[0010] In combination with the third possible implementation manner of the first aspect, in a fourth possible implementation manner of the first aspect, the power supply circuit is powered by an external DC power supply or internally powered. When powered internally, a diode is connected in series to the first load connection end of the bridge rectifier module, and the diode is connected to the power supply circuit. The power supply circuit steps down the voltage and connects to the VCC port of the MCU controller to power the MCU controller.

[0011] In combination with the third possible implementation of the first aspect, in a fifth possible implementation of the first aspect, the MCU control circuit also includes a zero-crossing detection circuit, which is connected between the first load connection terminal of the bridge rectifier module and the MCU controller to realize zero-crossing detection.

[0012] In combination with the third possible implementation manner of the first aspect, in a sixth possible implementation manner of the first aspect, one end of the switch control circuit connected to the first load connection end of the bridge rectifier module is grounded.

[0013] In combination with the sixth possible implementation of the first aspect, in the seventh possible implementation of the first aspect, the switch control circuit is a relay circuit, a thyristor control circuit, a MOS tube control circuit, an IGBT control circuit or other weak-current control of high-current switch control circuits.

[0014] In combination with the first aspect, in an eighth possible implementation manner of the first aspect, the heating unit includes a heating element, a temperature fuse, and a temperature controller connected in series.

[0015] In combination with the first aspect, in a ninth possible implementation manner of the first aspect, the water supply unit includes a diode and a water pump connected in series.

[0016] In a second aspect, an embodiment of the present application provides a multi-power supply garment steamer, comprising a multi-power supply garment steamer control circuit based on an MCU as described in any one of the first aspect or possible implementation methods of the first aspect, wherein the multi-power supply garment steamer control circuit based on an MCU is built into the multi-power supply garment steamer, and the multi-power supply garment steamer can operate normally under different power supply voltages through the multi-power supply garment steamer control circuit based on an MCU.

[0017] Beneficial effects:

[0018] The load circuit (including the first branch and the second branch in parallel) is connected by the power switch of the multi-power supply garment steamer control circuit based on MCU, the water supply part is connected in series on the first branch, the bridge rectifier module and the heating part are connected on the second branch, the load circuit is connected to the MCU control circuit, and the MCU control circuit is connected to the bridge rectifier module, forming a multi-power supply garment steamer control circuit based on MCU, which is used to determine whether to disconnect the load circuit according to whether the detected high-voltage signal exceeds the set threshold value, so as to realize the normal operation of the multi-power supply garment steamer under different power supply voltages. Under the condition of high voltage power supply, by using the characteristics of the AC sine wave (periodic gradual increase and gradual decrease), when the peak voltage after rectification at the current moment does not exceed the set threshold value, the load circuit is kept working, and when the peak voltage after rectification at the current moment exceeds the set threshold value, the load circuit is not working. Under the condition of low voltage power supply, under normal circumstances, the peak voltage after rectification at any moment will not exceed the set threshold value, and it can work normally. Therefore, the multi-power supply garment steamer control circuit based on MCU can be used to select components that can meet the normal operation under the set power supply voltage, so as to realize the normal operation of the multi-power supply garment steamer under different power supply voltages.

[0019] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 A schematic diagram of a multi-power garment steamer control circuit based on an MCU provided in an embodiment of the present application.

[0022] Icons: 11-power connector; 12-power switch; 13-heating part; 131-heating element; 132-temperature fuse; 133-thermostat; 14-water supply part; 141-diode; 142-water pump; 15-bridge rectifier module; 16-MCU control circuit; 161-MCU controller; 162-DC high voltage detection circuit; 163-power supply circuit; 164-switch control circuit; 165-zero-crossing detection circuit. DETAILED DESCRIPTION

[0023] The technical solutions 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.

[0024] In the description of this application, it should be noted that the terms "inside", "outside", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the application is usually placed when in use, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0025] It should also be noted that, unless otherwise clearly specified and limited, the terms "set" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be a connection between the two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances. In addition, when introducing the connection relationship between the components in the circuit in this embodiment, in order to facilitate understanding and make the current flow direction clearer, the description method of "first" and "later" to indicate the order is used, which should not be regarded as a limitation of this application. The order of connection of components in actual products is not prioritized.

[0026] The present embodiment provides a multi-power garment steamer, in which a multi-power garment steamer control circuit based on MCU is built into the multi-power garment steamer, and the multi-power garment steamer control circuit based on MCU enables the multi-power garment steamer to operate normally under different power supply voltages.

[0027] See also Figure 1 , Figure 1 A schematic diagram of a multi-power garment steamer control circuit based on an MCU provided in an embodiment of the present application. In this embodiment, the multi-power garment steamer control circuit based on an MCU may include a power connector 11, a power switch 12, a load circuit, a bridge rectifier module 15 and an MCU control circuit 16.

[0028] The power switch 12 is connected to the load circuit, and the load circuit includes a first branch and a second branch connected in parallel. The first branch is connected in series with a water supply unit 14, and the second branch is connected with a bridge rectifier module 15 and a heating unit 13. The load circuit is connected to an MCU control circuit 16, and the MCU control circuit 16 is connected to the bridge rectifier module 15 to form a multi-power garment steamer control circuit based on an MCU. The MCU control circuit 16 is used to determine whether to disconnect the load circuit according to whether the detected high-voltage signal exceeds a set threshold, so as to achieve normal operation of the multi-power garment steamer under different power supply voltages.

[0029] Exemplarily, the power connector 11 may include a first contact piece (i.e., a contact connected to the power supply) and a second contact piece (another contact connected to the power supply). After the first contact piece is connected in series with the power switch 12, it is connected to the load circuit. The load circuit includes a first branch and a second branch connected in parallel. The first branch is connected in series with a water supply part 14, and the second branch is connected to a bridge rectifier module 15. Then, the heating part 13, the load circuit and the MCU control circuit 16 are connected in series, and then return to the second contact piece through the bridge rectifier module 15, forming a multi-power supply garment steamer control circuit based on MCU.

[0030] The MCU control circuit 16 is used to detect the high-voltage signal after the rectification of the working voltage. When the high-voltage signal exceeds the set threshold, the connection between the load circuit and the second contact piece is disconnected. When the high-voltage signal does not exceed the set threshold, the connection between the load circuit and the second contact piece is maintained. Therefore, using the MCU control circuit 16, the MCU-based multi-power supply hanging ironing machine control circuit can use the characteristics of the AC sine wave (periodic gradual increase and gradual decrease) under the condition of a high-voltage power supply. When the peak voltage after rectification at the current moment does not exceed the set threshold, the load circuit is kept working, and when the peak voltage after rectification at the current moment exceeds the set threshold, the load circuit is stopped from working. Under the condition of a low-voltage power supply, under normal circumstances, the peak voltage after rectification at any moment will not exceed the set threshold, and it can work normally. Therefore, the MCU-based multi-power supply hanging ironing machine control circuit can be used to select components that can meet the normal operation under the set power supply voltage, so as to achieve the normal operation of the multi-power supply hanging ironing machine under different power supply voltages.

[0031] First, the bridge rectifier module 15 includes 4 diodes (high current diodes), and has two power connection terminals (two power connection terminals are opposite, and two diodes are spaced on both sides) and two load connection terminals (two load connection terminals are opposite, and two diodes are spaced on both sides), which are distributed around the first power connection terminal, the first load connection terminal, the second power connection terminal, and the second load connection terminal. The first contact piece is connected to the power switch 12 and then connected to the first power connection terminal, and the second contact piece is connected to the second power connection terminal; the MCU control circuit 16 is connected between the first load connection terminal and the second load connection terminal; the heating part 13 is connected between the first load connection terminal and the MCU control circuit 16.

[0032] The MCU control circuit 16 may include an MCU controller 161 , a DC high voltage detection circuit 162 , a power supply circuit 163 , a switch control circuit 164 and a diode.

[0033] After the first load connection end of the bridge rectifier module 15 is connected in series with a diode, it is connected to the DC high-voltage detection circuit 162, and then connected to the MCU controller 161 through the DC high-voltage detection circuit 162 to detect the high-voltage signal after the working voltage is rectified. For example, the DC high-voltage detection circuit 162 can divide the high voltage rectified by the mains (i.e., the AC power provided by the working power supply) through multiple resistors (i.e., voltage divider resistors) (connected in series), and the MCU controller 161 can collect the voltage V on the resistor with a small resistance value (i.e., the sampling resistor), perform ADC conversion, and select the maximum value V max , as a high voltage signal (the corresponding set threshold is a DC voltage signal). Of course, the peak value of the current mains network can also be further calculated to compare with the set threshold (the corresponding set threshold needs to be set as the converted AC voltage signal):

[0034] U max =V max *(R 采样 +R 分压 ) / R 采样 , (1)

[0035] U max is the peak value of the current mains network (i.e., working power supply) detected, V max is a high voltage signal, R 采样 is the sampling resistor, R 分压 is the voltage divider resistor.

[0036] The power supply circuit 163 is connected to the MCU controller 161 to supply power to the MCU controller 161. The power supply circuit 163 can be supplied by an external DC power supply or internal power supply. When the power supply is internally supplied, the first load connection end of the bridge rectifier module 15 is connected to the power supply circuit 163 after a diode is connected in series, and then connected to the VCC port of the MCU controller 161 after the power supply circuit 163 steps down the voltage to supply power to the MCU controller 161.

[0037] The MCU controller 161 is used to generate a corresponding control signal according to the comparison result between the detected high-voltage signal and the set threshold value. When the high-voltage signal exceeds the set threshold value, the control signal is disconnected, and when the high-voltage signal does not exceed the set threshold value, the control signal is connected. There are many optional models of the MCU controller 161, and the corresponding components can be selected according to the needs.

[0038] The switch control circuit 164 is connected to the MCU controller 161 and connected between the load circuit and the second load connection terminal of the bridge rectifier module 15, and is used to control the connection and disconnection between the load circuit and the second load connection terminal of the bridge rectifier module 15 according to the control signal of the MCU controller 161. One end of the switch control circuit 164 connected to the first load connection terminal of the bridge rectifier module 15 is grounded. The switch control circuit 164 is a relay circuit, a thyristor control circuit, a MOS tube control circuit, an IGBT control circuit or other weak current control strong current switch control circuit 164.

[0039] For ease of understanding, the following is a supplementary explanation of the method for determining the threshold value of a high voltage signal. For ease of understanding, the following is an example of the threshold value of a converted AC voltage signal:

[0040] Take the load with rated working voltage of 120V (frequency 60Hz) and power supply of 220V, 50Hz as an example calculation:

[0041] Heat generation: Q = I 2 Rt=U 2 *t / R;

[0042] Under 120V AC power supply, the peak Frequency f 1 =60Hz, the heat generated within 1s is:

[0043]

[0044] Under 220V AC power supply, the peak Frequency f 2 =50Hz, according to the symmetry characteristics of the circuit and the sine wave, the heat generated in 1s is:

[0045]

[0046] Let Q1 = Q2, calculate a is about 0.8105, the corresponding voltage is 225.45V, that is, set the threshold to 225.45V (this is U max , that is, the converted AC voltage signal). If a DC voltage signal is needed as the threshold value, it needs to be calculated using the following formula:

[0047] V max = U max * R 采样 / (R 采样 +R 分压 ), (4)

[0048] This enables the determination of the set threshold value.

[0049] In order to ensure the safety of the heating part 13, the heating part 13 may include a heating element 131 and a temperature fuse 132 connected in series. The temperature fuse 132 may be fused when the heating part 13 is overheated, thereby protecting the multi-power supply garment steamer.

[0050] In order to maintain a certain temperature level when the multi-power garment steamer is working, the heating part 13 also includes a thermostat 133. The thermostat 133 is connected in series with the heating element 131 and the temperature fuse 132 to achieve temperature control.

[0051] The water supply unit 14 may include a diode 141 and a water pump 142 . The diode 141 and the water pump 142 (pulse pump) of the water supply unit 14 are connected in series. The diode 141 allows half a cycle of the alternating current (sine wave) to pass through to power the water pump 142 and ensure the normal operation of the water pump 142 .

[0052] In summary, the embodiment of the present application provides a multi-power garment steamer control circuit based on MCU and a multi-power garment steamer. After the first contact piece of the power connector 11 in the multi-power garment steamer control circuit based on MCU is connected in series with the power switch 12, the load circuit is connected. The load circuit includes a first branch in parallel (the first branch is connected in series with the water supply part 14) and a second branch (the second branch is connected to the bridge rectifier module 15 and then connected in series with the heating part 13). The load circuit is connected to the MCU control circuit 16 and then returns to the second contact piece through the bridge rectifier module 15 to form a multi-power garment steamer control circuit based on MCU. The MCU control circuit 16 can be used to The over-DC high-voltage detection circuit 162 detects the high-voltage signal after the working voltage is rectified, and the MCU controller 161 generates a corresponding control signal according to the comparison result between the detected high-voltage signal and the set threshold value. When the high-voltage signal exceeds the set threshold value, the control signal is disconnected, and when the high-voltage signal does not exceed the set threshold value, the control signal is connected, and the switch control circuit 164 is connected to the MCU controller 161, and is connected between the load circuit and the second load connection end of the bridge rectifier module 15, and can realize the connection and disconnection between the load circuit and the second load connection end of the bridge rectifier module 15 according to the control signal of the MCU controller 161. Thus, under the condition of a high-voltage power supply, the characteristics of the alternating current sine wave (periodic gradual increase and gradual decrease) can be used. When the peak voltage after rectification at the current moment does not exceed the set threshold value, the load circuit is kept working, and when the peak voltage after rectification at the current moment exceeds the set threshold value, the load circuit is not working. Under the condition of a low-voltage power supply, under normal circumstances, the peak voltage after rectification at any moment will not exceed the set threshold value, and it can work normally. In this way, the MCU-based multi-power garment steamer control circuit can be utilized to select components that can meet the normal operation under the set power supply voltage, thereby achieving normal operation of the multi-power garment steamer under different power supply voltages.

[0053] The heating part 13 includes a heating element 131, a temperature fuse 132, and a thermostat 133 connected in series. The temperature fuse 132 can be blown when overheated to protect the multi-power hanging iron, and the thermostat 133 can control the temperature of the heating element 131 to maintain a relatively stable level. The diode of the water supply part 14 is connected in series with the water pump 142 (pulse pump). The diode can allow half a cycle of the alternating current (sine wave) to pass through to power the water pump 142 and ensure the normal operation of the water pump 142, so no rectification is required. The bridge rectifier module 15 is 4 high-current diodes that rectify the AC waveform into a unidirectional waveform for easy power supply and MCU control. The power supply circuit 163 in the MCU control circuit 16 can step down the high-voltage current to power the MCU (of course, an external power supply can also be selected). The zero-crossing detection circuit 165 can be used to detect the 0V voltage of the AC, and switch high-power loads on and off when the AC is 0V, which can avoid arcing and avoid affecting the AC network, and is beneficial to improving EMC. Zero-crossing detection can be achieved through components such as optocouplers, transistors, and MOS tubes.

[0054] The above description is only an embodiment of the present application and is not intended to limit the protection scope of the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A multi-power supply garment steamer control circuit based on MCU, characterized in that: Including power switch, load circuit, bridge rectifier module and MCU control circuit, The power switch is connected to the load circuit, and the load circuit includes a first branch and a second branch connected in parallel. The first branch is connected in series with a water supply part, and the second branch is connected with a bridge rectifier module and a heating part. The load circuit is connected to the MCU control circuit, and the MCU control circuit is connected to the bridge rectifier module to form a multi-power supply garment steamer control circuit based on MCU, wherein the MCU control circuit is used to determine whether to disconnect the load circuit according to whether the detected high-voltage signal exceeds a set threshold, so as to realize the normal operation of the multi-power supply garment steamer under different power supply voltages.

2. The MCU-based multi-power steamer control circuit according to claim 1, characterized in that: The MCU-based multi-power garment steamer control circuit also includes a power connector. The power connector includes a first contact piece and a second contact piece; The first contact piece is connected in series with the power switch, and the second contact piece is connected with the bridge rectifier module.

3. The MCU-based multi-power steamer control circuit according to claim 2, characterized in that: The bridge rectifier module includes four diodes and has two power connection terminals and two load connection terminals. The power switch is connected between the first contact piece and the first power connection terminal, and the second contact piece is connected to the second power connection terminal; The MCU control circuit is connected between the first load connection terminal and the second load connection terminal; The heating part is connected between the first load connection terminal and the MCU control circuit.

4. The MCU-based multi-power steamer control circuit according to claim 3, characterized in that: The MCU control circuit includes an MCU controller, a DC high voltage detection circuit, a power supply circuit, a switch control circuit and a diode. The first load connection end of the bridge rectifier module is connected in series with the diode, the diode is connected to the DC high voltage detection circuit, and the DC high voltage detection circuit is connected to the MCU controller to detect the high voltage signal after the working voltage is rectified; The power supply circuit is connected to the MCU controller to supply power to the MCU controller; The MCU controller is used to generate a corresponding control signal according to the comparison result between the detected high-voltage signal and the set threshold value, and when the high-voltage signal exceeds the set threshold value, the control signal is disconnected, and when the high-voltage signal does not exceed the set threshold value, the control signal is connected; The switch control circuit is connected to the MCU controller and connected between the load circuit and the second load connection end of the bridge rectifier module, and is used to achieve connection and disconnection between the load circuit and the second load connection end of the bridge rectifier module according to the control signal of the MCU controller.

5. The MCU-based multi-power supply garment steamer control circuit according to claim 4, characterized in that: The power supply circuit is powered by an external DC power supply or an internal power supply. When powered internally, the first load connection end of the bridge rectifier module is connected in series with the diode, the diode is connected to the power supply circuit, and is connected to the VCC port of the MCU controller after being stepped down by the power supply circuit to power the MCU controller.

6. The MCU-based multi-power steamer control circuit according to claim 4, characterized in that: The MCU control circuit also includes a zero-crossing detection circuit. The zero-crossing detection circuit is connected between the first load connection terminal of the bridge rectifier module and the MCU controller to achieve zero-crossing detection.

7. The MCU-based multi-power steamer control circuit according to claim 4, characterized in that: One end of the switch control circuit connected to the first load connection end of the bridge rectifier module is grounded.

8. The MCU-based multi-power garment steamer control circuit according to claim 1, characterized in that: The heating unit comprises a heating element, a temperature fuse and a temperature controller connected in series.

9. The MCU-based multi-power steamer control circuit according to claim 1, characterized in that: The water supply unit includes a diode and a water pump connected in series.

10. A multi-power garment steamer, characterized in that: It comprises the MCU-based multi-power garment steamer control circuit described in any one of claims 1-9, wherein the MCU-based multi-power garment steamer control circuit is built into the multi-power garment steamer, and the multi-power garment steamer can operate normally under different power supply voltages through the MCU-based multi-power garment steamer control circuit.

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