CN112928903A - Wide voltage input circuit, baking tray, ironing device and electric hair drier - Google Patents

Wide voltage input circuit, baking tray, ironing device and electric hair drier Download PDF

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Publication number
CN112928903A
CN112928903A CN201911237106.2A CN201911237106A CN112928903A CN 112928903 A CN112928903 A CN 112928903A CN 201911237106 A CN201911237106 A CN 201911237106A CN 112928903 A CN112928903 A CN 112928903A
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CN
China
Prior art keywords
resistor
diode
power
switch
terminal
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Pending
Application number
CN201911237106.2A
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Chinese (zh)
Inventor
王进贵
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Tsann Kuen Zhangzhou Enterprise Co Ltd
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Tsann Kuen Zhangzhou Enterprise Co Ltd
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Priority to CN201911237106.2A priority Critical patent/CN112928903A/en
Publication of CN112928903A publication Critical patent/CN112928903A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
    • H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
    • H02M5/06—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using impedances
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J37/00—Baking; Roasting; Grilling; Frying
    • A47J37/01—Vessels uniquely adapted for baking
    • A47J37/015—Vessels uniquely adapted for baking electrically heated
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/10—Arrangements incorporating converting means for enabling loads to be operated at will from different kinds of power supplies, e.g. from ac or dc
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B1/00—Details of electric heating devices
    • H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B1/00—Details of electric heating devices
    • H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
    • H05B1/0227—Applications
    • H05B1/0252—Domestic applications
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B1/00—Details of electric heating devices
    • H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
    • H05B1/0227—Applications
    • H05B1/0252—Domestic applications
    • H05B1/0255—Irons
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B1/00—Details of electric heating devices
    • H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
    • H05B1/0227—Applications
    • H05B1/0252—Domestic applications
    • H05B1/0258—For cooking
    • H05B1/0261—For cooking of food
    • H05B1/0263—Ovens
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/0014—Devices wherein the heating current flows through particular resistances
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/0019—Circuit arrangements

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Power Engineering (AREA)
  • Emergency Protection Circuit Devices (AREA)

Abstract

The embodiment of the invention discloses a wide voltage input circuit, a baking tray, an ironing device and an electric hair drier, and belongs to the technical field of electronics. Wherein the circuit comprises: the detection unit is used for detecting a first electric signal when the input alternating voltage is the first voltage, sending a first control signal to the first control unit and the second control unit according to the detected first electric signal so as to control the first control unit and the second control unit not to work, wherein the power of the output unit is first power, detecting a second electric signal when the input alternating voltage is the second voltage, sending a second control signal to the first control unit and the second control unit according to the detected second electric signal so as to control the first control unit and the second control unit to work, the power of the output unit is second power, and the first power is equal to or close to the second power. The invention can automatically switch according to the input wide voltage so as to ensure that different electric products with wide voltage input circuits can normally work.

Description

Wide voltage input circuit, baking tray, ironing device and electric hair drier
Technical Field
The invention relates to the technical field of electronics, in particular to a wide voltage input circuit, a baking tray, an ironing device and an electric hair drier.
Background
Because the mains voltage of many countries and regions in the world is not uniform, for example, the mains voltage of china is 220V, and the mains voltage of some countries is 110V, in order to ensure that the electric products normally work within the voltage fluctuation range, the working voltage range is usually limited to about 20% fluctuation of the corresponding mains voltage, namely, between 186V and 264V, or between 88V and 132V. Therefore, the same electric appliance products, such as bakeware, ironing device and electric hair drier, cannot be used in different countries using different mains supplies, and the current electric appliance products are not provided with an automatic input voltage switching circuit, so that the problem that the current electric appliance products cannot work normally under the condition of replacing the mains supply voltage can be caused.
In order to ensure that electrical products can normally work under different mains supply voltages, the method adopted at present generally needs a user to purchase a matched transformer for switching, and needs manual operation, so that the method is very inconvenient for manufacturers and consumers, if the user forgets to connect the transformer in advance, the power supply voltage of the electrical products is inconsistent with the rated voltage of the electrical products, the problem that the electrical products cannot normally work is caused, and even the safety and reliability of the electrical products are greatly reduced, and the user experience is poor.
Disclosure of Invention
The invention provides a wide voltage input circuit, a baking tray, an ironing device and a hair drier, which can automatically switch according to the input wide voltage so as to ensure that different electric products with the wide voltage input circuit can normally work.
The technical scheme is as follows:
an embodiment of the present invention provides a wide voltage input circuit, which includes: the detection unit is used for detecting a first electric signal when the input alternating voltage is the first voltage, sending a first control signal to the first control unit and the second control unit according to the detected first electric signal so as to control the first control unit and the second control unit not to work, the power of the output unit is first power, detecting a second electric signal when the input alternating voltage is the second voltage, sending a second control signal to the first control unit and the second control unit according to the detected second electric signal so as to control the first control unit and the second control unit to work, the power of the output unit is the second power, the first power is equal to the second power or the difference between the first power and the second power is in a power range.
In a preferred embodiment of the present invention, the detecting unit includes a detector, a transformer, a first capacitor, and a first diode, the detector includes a detecting end, a first control end, and a second control end, the first input end of the transformer is connected to the output unit, the second input end of the transformer is connected to an ac ground, the first output end of the transformer is connected to an anode of the first diode, the second output end of the transformer is grounded, and is further connected to the detecting end through the first capacitor, and is further connected to a cathode of the first diode through the first capacitor.
In a preferred embodiment of the present invention, the first control unit includes a first switch, a first protection element, a second switch, a first relay, a first resistor, and a second resistor, the first protection element is a second diode, a first end of the first switch is connected to the output unit through the first resistor and is also grounded through the second resistor, a second end of the first switch is grounded, a third end of the first switch is connected to one end of the first relay and is also connected to an anode of the first protection element, a cathode of the first protection element is connected to the power supply and is also connected to the other end of the first relay, a common end of the second switch is connected to the output unit, a first contact end of the second switch is connected to the ac live wire to receive the ac live wire voltage, and a second contact end of the second switch is connected to the ac ground wire.
In a preferred embodiment of the present invention, the first switch is a triode, and the first terminal, the second terminal, and the third terminal of the first switch correspond to a base, an emitter, and a collector of the triode, respectively.
In a preferred embodiment of the present invention, the second control unit includes a third switch, a second protection element, a fourth switch, a second relay, a third resistor, and a fourth resistor, the first protection element is a third diode, a first end of the third switch is connected to the output unit through the third resistor and is also grounded through the fourth resistor, a second end of the third switch is grounded, a third end of the third switch is connected to one end of the second relay and is also connected to an anode of the second protection element, a cathode of the second protection element is connected to the power supply and is also connected to the other end of the second relay, a first contact of the fourth switch is connected to the power-taking end of the output unit, and a second contact of the fourth switch is connected to the ac live wire to receive the ac live wire voltage.
In a preferred embodiment of the present invention, the third switch is a triode, and the first terminal, the second terminal, and the third terminal of the third switch correspond to a base, an emitter, and a collector of the triode, respectively.
In a preferred embodiment of the present invention, the output unit includes a fifth resistor and a sixth resistor, a node between the fifth resistor and the sixth resistor is connected to the power taking end, one end of the fifth resistor is connected to the detection unit, the other end of the fifth resistor is connected to one end of the sixth resistor, the fifth resistor is further connected to the power taking end and the second control unit, and the other end of the sixth resistor is connected to the first control unit.
In a preferred embodiment of the present invention, the output unit includes a fourth diode, a fifth diode, a second capacitor, a third capacitor, an inductor, a seventh resistor, an eighth resistor, and a ninth resistor, an anode of the fourth diode is connected to the ac live wire, a cathode of the fourth diode is connected to an anode of the fifth diode, a cathode of the fifth diode is connected to one end of the second capacitor, another end of the second capacitor is grounded and is connected to the ac ground wire, a cathode of the fifth diode is further connected to one end of the inductor, another end of the inductor is connected to one end of the seventh resistor and is grounded via the third capacitor, another end of the seventh resistor is connected to one end of the fourth capacitor and the detection end via the eighth resistor and is connected to one end of the ninth resistor via the eighth resistor, and another end of the ninth resistor and another end of the fourth capacitor are both grounded.
The embodiment of the invention also provides a baking tray, which comprises: and in the wide voltage input circuit, the fifth resistor and the sixth resistor are heating wires.
An embodiment of the present invention further provides an ironing apparatus, which includes: the wide voltage input circuit, the fifth resistance and the sixth resistance are heating wires, the ironing device further comprises a first motor and water pump equipment, one end of the first motor is connected with an alternating current ground wire, and the other end of the first motor is connected with the water pump equipment and is further connected with a power taking end.
The embodiment of the invention also provides an electric hair drier, which comprises: the electric hair drier further comprises a tenth resistor, a second motor, a sixth diode, a seventh diode, an eighth diode and a ninth diode, one end of the tenth resistor is connected with the power taking end, the other end of the tenth resistor is connected with the cathode of the sixth diode and the anode of the seventh diode, the anode of the sixth diode is connected with the anode of the eighth diode, the seventh diode and the cathode of the ninth diode are further connected through the second motor, and the cathode of the eighth diode and the anode of the ninth diode are connected with the power taking end.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
when the input alternating voltage is the first voltage, a first electric signal is detected, and a first control signal is sent to the first control unit and the second control unit according to the detected first electric signal so as to control the first control unit and the second control unit not to work, the power of the output unit is the first power, when the input alternating voltage is the second voltage, a second electric signal is detected, and a second control signal is sent to the first control unit and the second control unit according to the detected second electric signal so as to control the first control unit and the second control unit to work, the power of the output unit is the second power, and the first power is equal to the second power or the difference between the first power and the second power is within a power range. The invention can automatically switch according to the input wide voltage, can ensure that different electric products with wide voltage input circuits can normally work without replacing electric appliances, and has the advantages of simple circuit structure, lower cost and strong practicability.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented in accordance with the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more clearly understood, the following preferred embodiments are described in detail with reference to the accompanying drawings.
Drawings
Fig. 1 is a block diagram of a wide voltage input circuit according to an embodiment of the present invention;
fig. 2 is a block diagram of a circuit configuration of the wide voltage input circuit of fig. 1;
FIG. 3 is a block diagram of another circuit configuration of the wide voltage input circuit of FIG. 1;
fig. 4 is a block diagram of a circuit structure of an ironing apparatus having a wide voltage input circuit according to an embodiment of the present invention;
fig. 5 is a block diagram of the circuit structure of the hair dryer with a wide voltage input circuit according to the embodiment of the present invention.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description of the embodiments, structures, features and effects of the wide voltage input circuit, the baking tray, the ironing device and the hair dryer according to the present invention will be made with reference to the accompanying drawings and the preferred embodiments.
The foregoing and other technical and scientific aspects, features and advantages of the present invention will be apparent from the following detailed description of preferred embodiments, which is to be read in connection with the accompanying drawings. While the present invention has been described in connection with the preferred embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but is intended to cover various modifications, equivalent arrangements, and specific embodiments thereof.
Fig. 1 is a block diagram of a wide voltage input circuit according to an embodiment of the present invention. The wide voltage input circuit can automatically switch according to the input wide voltage so as to ensure that different electric products with the wide voltage input circuit can normally work. Referring to fig. 1, the wide voltage input circuit of the present embodiment includes: the device comprises a detection unit 10, a first control unit 11, a second control unit 12 and an output unit 13.
Specifically, the output unit 13 has a power taking terminal Out, the detecting unit 10 is connected to the first control unit 11, the second control unit 12 and the output unit 13, the output unit 13 is connected to the first control unit 11 and the second control unit 12, the detecting unit 10 is configured to detect a first electrical signal when the input ac voltage is a first voltage, and send a first control signal to the first control unit 11 and the second control unit 12 according to the detected first electrical signal to control the first control unit 11 and the second control unit 12 not to operate, the power of the output unit 13 is a first power, when the input ac voltage is a second voltage, detect a second electrical signal, and send a second control signal to the first control unit 11 and the second control unit 12 according to the detected second electrical signal to control the first control unit 11 and the second control unit 12 to operate the first control unit 11 and the second control unit 12, the power of the output unit 13 is a second power, the first power is equal to the second power or a difference between the first power and the second power is within a power range, for example, the power range is greater than 0W and less than or equal to 430W, that is, the first power is close to or equal to the second power, wherein the first voltage is greater than the second voltage, the first voltage and the second voltage can both be a voltage range, for example, the first voltage is about 230 volts or so, the second voltage is about 120 volts or so, and the first electrical signal and the second electrical signal can both be voltage signals.
Fig. 2 is a block diagram of a circuit configuration of the wide voltage input circuit in fig. 1. Referring to fig. 2, the detecting unit 10 includes a detector 8, a transformer TR, a first capacitor C and a first diode D1, the detector 8 includes a detecting terminal 101, a first control terminal 102 and a second control terminal 103, a first input terminal of the transformer TR is connected to the output unit 13, a second input terminal of the transformer TR is connected to an ac ground line ACN, a first output terminal of the transformer TR is connected to an anode of the first diode D1, a second output terminal of the transformer TR is grounded, and is further connected to the detecting terminal 101 through the first capacitor C and is further connected to a cathode of the first diode D1 through the first capacitor C.
Wherein, the detecting terminal 101 of the detector detects the first electrical signal, and according to the detected first electrical signal, the first control terminal 102 sends a first control signal (e.g. low level signal) to the first control unit 11, the second control terminal 103 sends a first control signal (e.g. low level signal) to the second control unit 12 to control the first control unit 11 and the second control unit 12 to be out of operation respectively, the power of the output unit 13 is the first power, when the input ac voltage is the second voltage, the detecting terminal 101 detects the second electrical signal, and according to the detected second electrical signal, the first control terminal 102 sends a first control signal (e.g. high level signal) to the first control unit 11, the second control terminal 103 sends a first control signal (e.g. high level signal) to the second control unit 12 to control the first control unit 11 and the second control unit 12 to be operated respectively, the power of the output unit 13 is the second power, and the first power is equal to the second power or the difference between the first power and the second power is within a power range.
The first control unit 11 includes a first switch (e.g. a transistor) Q1, a first protection element (e.g. a second diode) D2, a second switch K1, a first Relay1, a first resistor R1, and a second resistor R2, a first terminal (e.g. a base) of a transistor Q1 is connected to the first control terminal 102 of the output unit through the first resistor R1, and is also connected to ground through the second resistor R2, a second terminal (e.g. an emitter) of a transistor Q1 is connected to ground, a third terminal (e.g. a collector) of the transistor Q1 is connected to one terminal of the first Relay1 and is also connected to an anode of the diode D2, a cathode of the diode D2 is connected to a power source VCC, and is also connected to the other terminal of the first Relay1, a common terminal a1 of the second switch K1 is connected to the output unit 13, a first contact terminal a2 of the second switch K1 is connected to an ac Relay ACL 36, to receive the ac line voltage, the second contact terminal a3 of the second switch K1 is connected to the ac ground ACN.
The first protection element D2 protects the first Relay 1. When the voltage of the ac power line ACL is 120V, the first control terminal 102 provides a high level signal to the first control unit 11, the transistor Q1 of the first control unit 11 is turned on, and the Relay1 is controlled to operate, so that the switch K1 is attracted downward by the magnetic force generated in the Relay1, so that the common terminal a1 is connected to the second contact terminal a3, and the common terminal a1 of the switch K1 is connected to the second contact terminal a3 and to the ac ground line CAN.
When the voltage of the ac live wire ACL is 230V, the first control terminal 102 provides a low level signal to the first control unit 11, the transistor Q1 of the first switching unit 11 is turned off, the Relay1 is controlled to be inoperative, so as not to actuate the switch K1, the switch K1 is released, the common terminal a1 contacts the first contact terminal a2, and the common terminal a1 connects the first contact terminal a2 and the ac live wire ACL.
The second control unit 12 includes a third switch (e.g., a transistor) Q2, a second protection element (e.g., a third diode) D3, a fourth switch K2, a second Relay2, a third resistor R3, and a fourth resistor R4, a first terminal (e.g., a base) of the transistor Q2 is connected to the second control terminal 103 of the output unit through the third resistor R1 and also connected to ground through the fourth resistor R4, a second terminal (e.g., an emitter) of the transistor Q2 is connected to ground, a third terminal (e.g., a collector) of the transistor Q2 is connected to one terminal of the second Relay2 and also connected to an anode of the diode D3, a cathode of the diode D3 is connected to a power supply VCC and also connected to the other terminal of the second Relay2, a first contact b1 of the fourth switch K2 is connected to the power take-Out terminal of the output unit 13, and a second contact b2 of the fourth switch K2 is connected to an ac load Relay for receiving an ac voltage.
The second protection element D3 protects the second Relay 2.
The output unit 13 includes a node connection power taking terminal Out between a fifth resistor R5, a sixth resistor R6, a fifth resistor R5 and a sixth resistor R6, one end of the fifth resistor R5 is connected to a first input terminal of a transformer TR of the detection unit 10, the other end is connected to one end of a resistor R6, the power taking terminal Out is connected to a first contact b1 of a fourth switch K2 of the second control unit 12, and the other end of the sixth resistor R6 is connected to a common terminal a1 of a second switch K1 in the first control unit 11.
When the voltage of the ac live wire ACL is 120V, the second control terminal 103 provides a high level signal to the second control unit 12, the transistor Q2 of the second control unit 12 is turned on, and the Relay2 is controlled to operate, so that the magnetic force generated in the Relay1 pulls the switch K2 downward to make the first contact b1 connect with the second contact b2, and the first contact b1 and the second contact b2 are connected with the ac live wire ACL, because the common terminal a1 of the switch K1 connects with the second contact a3 and with the ac ground wire CAN. Thus, the fifth resistor R5 and the sixth resistor R6 of the output unit 13 form a parallel circuit, and the power of the output unit 13 is the first power, i.e., the sum of the powers of the resistor R5 and the resistor R6 is the first power.
When the voltage of the ac live wire ACL is 230V, the second control terminal 103 provides a low level signal to the second control unit 12, the transistor Q2 of the second control unit 12 is turned off, and the Relay2 is controlled to stop working, so that the switch K2 is not pulled, and the switch K2 is turned off. And because the common terminal a1 is connected to the first contact terminal a2 and the ac power line ACL, the fifth resistor R5 and the sixth resistor R6 form a series circuit, the power of the output unit 13 is the second power, that is, the sum of the powers of the resistor R5 and the resistor R6 is the second power, and the first power is equal to the second power or the difference between the first power and the second power is within a power range, so that various electric appliances connected at the power-taking terminal Out can be guaranteed to work normally regardless of the change of the external ac voltage.
The operation of the wide voltage input circuit is described in detail as follows:
at the moment of power-on, the switch K2 is turned off, the common terminal a1 of the switch K1 is connected to the ac power line ACL, the fifth resistor R5 and the sixth resistor R6 form a series circuit, and the detection terminal 101 of the detection unit 10 can detect the voltage of the node AD between the cathode of the diode D3 and one end of the capacitor C, so that the voltage can be converted into a detection current flowing through the transformer TR according to the detection voltage. If the input voltage of the ac line ACL is 230V, the corresponding detection current is about 3.9A. If the input voltage of the ac line ACL is 120V, the corresponding detection current is about 2.08A. Because when the detection current is 2.08A, the voltage of the ac live wire ACL is 120V, the first control terminal 102 of the detection unit 10 provides a high level signal to the first control unit 11, the transistor Q1 of the first control unit 11 is turned on, the Relay1 is controlled to operate, so that the magnetic force generated in the Relay1 pulls the switch K1 downward to connect the common terminal a1 with the second contact terminal a3, the common terminal a1 of the switch K1 connects the second contact terminal a3 with the ac ground wire ACN, meanwhile, the second control terminal 103 of the detection unit 10 provides a high level signal to the second control unit 12, the transistor Q2 of the second control unit 12 is turned on, the Relay2 is controlled to operate, so that the magnetic force generated in the Relay1 pulls the switch K2 downward to connect the first contact point b1 with the second contact point b2, the first contact point b 638 and the second contact point b 59623 with the ac live wire ACL 23, and thus the sixth resistor R6 are connected in parallel, the sum of the powers of the resistor R5 and the resistor R6 is the first power.
Furthermore, when the detection current is 3.9A, the voltage of the ac power line ACL is 230V, the first control terminal 102 of the detection unit 10 provides a low level signal to the first control unit 11, the transistor Q1 of the first control unit 11 is turned off, the control Relay1 is not operated, so that the switch K1 is not engaged, the switch K1 is released and the common terminal a1 is contacted to the first contact terminal a2, the common terminal a1 is connected to the first contact terminal a2 and connected to the ac power line ACL, at the same time, the second control terminal 103 of the detection unit 10 provides a low level signal to the second control unit 12, the transistor Q2 of the second control unit 12 is turned off, the control Relay2 is not operated, so that the switch K2 is not engaged, the switch K2 is turned off, so that the fifth resistor R5 and the sixth resistor R6 form a series circuit, the sum of the powers of the resistor R5 and the resistor R6 is a second power, and the first power is equal to or the difference between the second power and the first power, therefore, various electric appliances connected at the power taking end Out can work normally no matter how the external alternating voltage changes.
From this, it can be seen that when the input voltage of the ac line is 230V, the switch K1 turns on the ac line ACL, and the switch K2 turns off. The resistor R5 and the resistor R6 are connected in series, and the sum of the powers of the resistor R5 and the resistor R6 is the first power. When the input voltage of the AC live wire is 120V, the switch K1 is connected with the AC ground wire ACN, and the switch K2 is pulled in. The resistor R5 and the resistor R6 are connected in parallel, and the sum of the power of the resistor R5 and the power of the resistor R6 is still unchanged, namely is close to or equal to the first power, so that the electric appliance can work under wide voltage input by changing the series-parallel connection of the resistor R5 and the resistor R6.
Fig. 3 is another circuit configuration block diagram of the wide voltage input circuit of fig. 1. Referring to fig. 3, fig. 3 is similar to the circuit diagram of fig. 2, except that: the output unit in fig. 3 is different from the output unit in fig. 2 in circuit structure, the output unit in fig. 3 includes a fourth diode D4, a fifth diode D5, a second capacitor C2, a third capacitor C3, an inductor L1, a seventh resistor R7, an eighth resistor R8, and a ninth resistor R9, an anode of the fourth diode D4 is connected to the ac line, a cathode of the fourth diode D4 is connected to an anode of the fifth diode D5, a cathode of the fifth diode D5 is connected to one end of the second capacitor C2, the other end of the second capacitor C2 is grounded, and an ac ground line is connected, a cathode of the fifth diode D5 is further connected to one end of the inductor L1, the other end of the inductor L1 is connected to one end of the seventh resistor R7, and is further grounded through the third capacitor C3, the other end of the seventh resistor R7 is connected to one end of the fourth capacitor C56 and the detection end 101 through an eighth resistor R8269553, the other end of the ninth resistor R9 and the other end of the fourth capacitor C4 are both grounded.
In fig. 3, the voltage detection method of the output unit 13 is as follows: the mains voltage is rectified by diodes D4 and D5, filtered by capacitors C2 and C3 and then converted into DC voltage, and the voltage is divided by resistors R7, R8 and R9, so that the voltage of a node AD2 between the resistor R9 and the capacitor C4 can be detected by the detection end 101. For example, the mains voltage of 230VAC, the voltage of node AD2 is detected to be 3.6V by detection terminal 101. The voltage of node AD2 is detected to be 2V by detection terminal 101 at the commercial power voltage of 120 VAC. Different mains voltages can be deduced by detecting the difference in voltage.
The working process of the first control unit 11 and the second control unit 12 is the same as that of fig. 2, and is not described again here. From this, it can be seen that when the input voltage of the ac line is 230V, the switch K1 turns on the ac line ACL, and the switch K2 turns off. The resistor R5 and the resistor R6 are connected in series, and the sum of the powers of the resistor R5 and the resistor R6 is the first power. When the input voltage of the AC live wire is 120V, the switch K1 is connected with the AC ground wire ACN, and the switch K2 is pulled in. The sum of the power of the resistor R5 and the power of the resistor R6 is still kept unchanged, namely is close to or equal to the first power, so that the electric appliance can work under wide voltage input by changing the series-parallel connection of the resistor R5 and the resistor R6.
According to the above embodiment, the embodiment of the present invention further discloses a baking tray, which includes the wide voltage input circuit in the above embodiment, the fifth resistor R5 and the sixth resistor R6 are heating wires, and the baking tray may further include some peripheral components (not shown in the figure), and the peripheral components are connected to the power-taking end Out. When the input voltage of the ac line is 230V, the switch K1 turns on the ac line ACL, and the switch K2 turns off. The heating wire R5 and the heating wire R6 are connected in series, the heating wire R5 and the heating wire R6 generate heat to heat food and the like, and the sum of the heating powers of the heating wire R5 and the heating wire R6 is a first power. When the input voltage of the AC live wire is 120V, the switch K1 is connected with the AC ground wire ACN, and the switch K2 is pulled in. The heating wire R5 and the heating wire R6 are connected in parallel, the heating wire R5 and the heating wire R6 heat to heat food and the like, the sum of the heating powers of the heating wire R5 and the heating wire R6 is still kept unchanged, namely is close to or equal to the first power, the components of the baking tray connected with the power taking end Out do not influence the change of external alternating voltage, and the sum of the heating powers of the heating wire R5 and the heating wire R6 is unchanged, so that the heating power of the baking tray is ensured to be unchanged, and the baking tray can work under wide voltage input by changing the series-parallel connection of the heating wire R5 and the heating wire R6.
Fig. 4 is a block diagram of a circuit structure of an ironing apparatus having the wide voltage input circuit in fig. 1, 2 or 3 according to an embodiment of the present invention. As shown in fig. 4, according to the above embodiment, the embodiment of the present invention further discloses an ironing apparatus, which includes the wide voltage input circuit in the above embodiment, the fifth resistor R5 and the sixth resistor R6 are heating wires, the ironing apparatus further includes a first motor M1 and a water pump device P1, one end of the first motor M1 is connected to an ac ground, and the other end of the first motor M1 is connected to the water pump device and is further connected to the power-taking terminal Out.
When the input voltage of the ac live wire is 230V, the switch K1 is connected to the ac live wire ACL, and the switch K2 is turned off. The resistor R5 and the resistor R6 are connected in series, and the sum of the heating powers of the resistor R5 and the resistor R6 is the first power. When the input voltage of the AC live wire is 120V, the switch K1 is connected with the AC ground wire ACN, and the switch K2 is pulled in. The resistor R5 and the resistor R6 are connected in parallel, and the sum of the heating powers of the resistor R5 and the resistor R6 is still kept unchanged, namely is close to or equal to the first power, so that the ironing device can work under the wide voltage input by changing the series-parallel connection of the resistor R5 and the resistor R6.
Fig. 5 is a block diagram of a circuit structure of the hair dryer having the wide voltage input circuit shown in fig. 1, fig. 2 or fig. 3 according to an embodiment of the present invention. As shown in fig. 5, according to the above embodiment, the embodiment of the present invention further discloses a hair dryer, which includes the wide voltage input circuit in the above embodiment, the fifth resistor R5 and the sixth resistor R6 are heating wires, the hair dryer further includes a tenth resistor R10, a second motor M2, a sixth diode D6, a seventh diode D7, an eighth diode D8, and a ninth diode D9, the resistor R10 is connected to the power-Out terminal Out, the cathode of the diode D6 and the anode of the diode D7 are connected, the anode of the diode D6 is connected to the anode of the diode D8, the cathode of the diode D7 and the cathode of the diode D9 are connected through the second motor M2, and the cathode of the diode D8 is connected to the anode of the diode D9.
When the input voltage of the ac line is 230V, the switch K1 turns on the ac line ACL, and the switch K2 turns off. The resistor R5 and the resistor R6 are connected in series, and the sum of the heating powers of the resistor R5 and the resistor R6 is the first power. When the input voltage of the AC live wire is 120V, the switch K1 is connected with the AC ground wire ACN, and the switch K2 is pulled in. The resistor R5 and the resistor R6 are connected in parallel, and the sum of the heating powers of the resistor R5 and the resistor R6 is still kept unchanged, namely is close to or equal to the first power, so that the hair dryer can work under wide voltage input by changing the series-parallel connection of the resistor R5 and the resistor R6.
In summary, according to the wide voltage input circuit, the baking tray, the ironing device, and the electric hair dryer provided in the embodiments of the present invention, when the input ac voltage is the first voltage, the first electric signal is detected, and the first control signal is sent to the first control unit and the second control unit according to the detected first electric signal, so as to control the first control unit and the second control unit not to operate, the power of the output unit is the first power, when the input ac voltage is the second voltage, the second electric signal is detected, and the second control signal is sent to the first control unit and the second control unit according to the detected second electric signal, so as to control the first control unit and the second control unit to operate, the power of the output unit is the second power, and the first power is equal to the second power or a difference between the first power and the second power is within a power range. The invention can automatically switch according to the input wide voltage, can ensure that different electric products with wide voltage input circuits can normally work without replacing electric appliances, and has the advantages of simple circuit structure, lower cost and strong practicability.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (11)

1. A wide voltage input circuit, comprising: the detection unit is used for detecting a first electric signal when the input alternating voltage is the first voltage, sending a first control signal to the first control unit and the second control unit according to the detected first electric signal so as to control the first control unit and the second control unit not to work, the power of the output unit is first power, detecting a second electric signal when the input alternating voltage is the second voltage, sending a second control signal to the first control unit and the second control unit according to the detected second electric signal so as to control the first control unit and the second control unit to work, the power of the output unit is the second power, the first power is equal to the second power or the difference between the first power and the second power is in a power range.
2. The wide voltage input circuit according to claim 1, wherein the detection unit comprises a detector, a transformer, a first capacitor and a first diode, the detector comprises a detection terminal, a first control terminal and a second control terminal, the first input terminal of the transformer is connected to the output unit, the second input terminal of the transformer is connected to an ac ground, the first output terminal of the transformer is connected to an anode of the first diode, the second output terminal of the transformer is connected to ground, the first output terminal of the transformer is further connected to the detection terminal through the first capacitor, and the second output terminal of the transformer is further connected to a cathode of the first diode through the first capacitor.
3. The wide voltage input circuit according to claim 1, wherein the first control unit comprises a first switch, a first protection element, a second switch, a first relay, a first resistor, and a second resistor, the first protection element is a second diode, a first end of the first switch is connected to the output unit through the first resistor and is also connected to the ground through the second resistor, a second end of the first switch is connected to the ground, a third end of the first switch is connected to one end of the first relay and is also connected to an anode of the first protection element, a cathode of the first protection element is connected to a power supply and is also connected to the other end of the first relay, a common end of the second switch is connected to the output unit, a first contact end of the second switch is connected to the ac live wire to receive the ac live wire voltage, and a second contact end of the second switch is connected to the ac ground wire.
4. The wide voltage input circuit of claim 3, wherein the first switch is a transistor, and the first terminal, the second terminal, and the third terminal of the first switch correspond to a base, an emitter, and a collector of the transistor, respectively.
5. The wide voltage input circuit according to claim 1, wherein the second control unit includes a third switch, a second protection element, a fourth switch, a second relay, a third resistor, and a fourth resistor, the first protection element is a third diode, a first end of the third switch is connected to the output unit through the third resistor and is also connected to the ground through the fourth resistor, a second end of the third switch is connected to the ground, a third end of the third switch is connected to one end of the second relay and is also connected to an anode of the second protection element, a cathode of the second protection element is connected to a power supply and is also connected to the other end of the second relay, a first contact of the fourth switch is connected to a power-taking end of the output unit, and a second contact of the fourth switch is connected to the ac live wire to receive the ac live wire voltage.
6. The wide voltage input circuit of claim 5, wherein the third switch is a transistor, and the first terminal, the second terminal, and the third terminal of the third switch correspond to a base, an emitter, and a collector of the transistor, respectively.
7. The wide voltage input circuit according to claim 1, wherein the output unit comprises a fifth resistor and a sixth resistor, a node between the fifth resistor and the sixth resistor is connected to the power-taking terminal, one end of the fifth resistor is connected to the detection unit, the other end of the fifth resistor is connected to one end of the sixth resistor, the fifth resistor is further connected to the power-taking terminal and the second control unit, and the other end of the sixth resistor is connected to the first control unit.
8. The wide voltage input circuit of claim 1, wherein the output unit comprises a fourth diode, a fifth diode, a second capacitor, and a third capacitor, the inductor, the seventh resistor, eighth resistor and ninth resistor, the positive pole of fourth diode links to each other with exchanging the live wire, the negative pole of fourth diode links to each other with the positive pole of fifth diode, the negative pole of fifth diode links to each other with the one end of second electric capacity, the other end ground connection of second electric capacity, still connect and exchange ground wire, the negative pole of fifth diode still links to each other with the one end of inductor, the other end of inductor links to each other with the one end of seventh resistor, still through third electric capacity ground connection, the other end of seventh resistor passes through the eighth resistor and links to each other with the one end and the sense terminal of fourth electric capacity, still pass through the eighth resistor and link to each other with the one end of ninth resistor, the other end of ninth resistor and the other end of fourth electric capacity all ground connection.
9. A bakeware, which is characterized in that the bakeware comprises: the wide voltage input circuit of any of claims 1-8, wherein the fifth and sixth resistances are both heating wires.
10. Ironing apparatus, characterized in that it comprises: the wide voltage input circuit according to any one of claims 1 to 8, wherein the fifth resistor and the sixth resistor are both heating wires, the ironing device further comprises a first motor and a water pump device, one end of the first motor is connected with an alternating current ground wire, and the other end of the first motor is connected with the water pump device and is further connected with a power taking end.
11. A hair dryer, characterized in that it comprises: the wide voltage input circuit according to any one of claims 1 to 8, wherein the fifth resistor and the sixth resistor are both heating wires, the hair dryer further comprises a tenth resistor, a second motor, a sixth diode, a seventh diode, an eighth diode, and a ninth diode, one end of the tenth resistor is connected to the power-taking terminal, the other end of the tenth resistor is connected to the cathode of the sixth diode and the anode of the seventh diode, the anode of the sixth diode is connected to the anode of the eighth diode, the seventh diode and the cathode of the ninth diode are further connected to the second motor, and the cathode of the eighth diode is connected to the anode of the ninth diode.
CN201911237106.2A 2019-12-05 2019-12-05 Wide voltage input circuit, baking tray, ironing device and electric hair drier Pending CN112928903A (en)

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CN201911237106.2A CN112928903A (en) 2019-12-05 2019-12-05 Wide voltage input circuit, baking tray, ironing device and electric hair drier

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CN104917403A (en) * 2015-05-25 2015-09-16 张家港市华为电子有限公司 Automatic switching circuit in power supply applicable to 220V and 110V power grids
CN104953837A (en) * 2014-03-31 2015-09-30 台达电子企业管理（上海）有限公司 Control device for power converter, control method and switching power supply
CN105811571A (en) * 2016-03-22 2016-07-27 珠海博威智能电网有限公司 Intelligent switching dual-power-supply apparatus and operating method therefor
US20160233720A1 (en) * 2013-12-31 2016-08-11 Lite-On, Inc. Dual input power supply system and method

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101175344A (en) * 2007-11-12 2008-05-07 苏州尼克司建材有限公司 Vehicle mounted electric heating seating washer
CN101471174A (en) * 2007-12-27 2009-07-01 深圳迈瑞生物医疗电子股份有限公司 Isolation transformer
CN201438268U (en) * 2009-06-24 2010-04-14 深圳市思维电器实业有限公司 Dual-power switching control device
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