CN111736004B - Alternating voltage detection circuit and electronic device - Google Patents

Alternating voltage detection circuit and electronic device Download PDF

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Publication number
CN111736004B
CN111736004B CN202010703101.0A CN202010703101A CN111736004B CN 111736004 B CN111736004 B CN 111736004B CN 202010703101 A CN202010703101 A CN 202010703101A CN 111736004 B CN111736004 B CN 111736004B
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voltage
diode
circuit
voltage detection
resistor
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CN111736004A (en
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黄家根
陈兵
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Dreame Technology Suzhou Co ltd
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Dreame Technology Suzhou Co ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
    • G01R19/2503—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques for measuring voltage only, e.g. digital volt meters (DVM's)
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
    • G01R19/2506—Arrangements for conditioning or analysing measured signals, e.g. for indicating peak values ; Details concerning sampling, digitizing or waveform capturing
    • G01R19/2509—Details concerning sampling, digitizing or waveform capturing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Current Or Voltage (AREA)
  • Rectifiers (AREA)

Abstract

The application relates to an alternating voltage detection circuit and electronic equipment belongs to voltage detection technical field, and alternating voltage detection circuit includes: the voltage input end is used for inputting alternating current to be detected and comprises a first end and a second end; a resistance-capacitance voltage reduction half-wave rectification circuit connected with the voltage input end; the voltage detection circuit is connected with the resistance-capacitance voltage reduction half-wave rectification circuit in parallel and comprises a first diode, and the anode of the first diode is connected with the second end of the voltage input end; a voltage division circuit connected to the cathode of the first diode; the voltage detection chip comprises a voltage input interface, a grounding interface and a voltage detection interface; the voltage input interface is connected with the resistance-capacitance voltage reduction half-wave rectification circuit, the grounding interface is connected with a voltage reference point, and the voltage detection interface is connected with the voltage division circuit; the problem that the existing alternating voltage detection circuit occupies a large installation space can be solved; the installation space of the alternating voltage detection circuit can be saved.

Description

Alternating voltage detection circuit and electronic device
Technical Field
The application relates to an alternating voltage detection circuit and electronic equipment, and belongs to the technical field of voltage detection.
Background
With the development of electronic power technology, more and more electric appliances (such as hair dryer, refrigerator, etc.) are widely used in daily life, and these electric appliances need to be connected to the mains voltage during the use process, and need to detect the mains voltage to protect the electric appliances.
Conventional mains voltage detection schemes include: alternating current-direct current conversion is carried out on mains supply voltage through a transformer to obtain direct current, and the change of the voltage value of the direct current is detected, so that the mains supply voltage is detected.
However, the transformer generally requires a large installation space, which results in an increase in the installation space of the devices for installing the voltage detection circuit.
Disclosure of Invention
The application provides an alternating voltage detection circuit and electronic equipment, can solve when using the transformer to carry out alternating current-direct current conversion in current alternating voltage detection circuit, the great problem of installation space that occupies. The application provides the following technical scheme:
in a first aspect, an ac voltage detection circuit is provided, the ac voltage detection circuit including:
the voltage input end is used for inputting alternating current to be detected and comprises a first end and a second end;
a resistance-capacitance voltage reduction half-wave rectification circuit connected with the voltage input end;
a voltage detection circuit connected in parallel with the resistance-capacitance step-down half-wave rectification circuit, the voltage detection circuit comprising:
the anode of the first diode is connected with the second end of the voltage input end;
the voltage division circuit is connected with the cathode of the first diode;
the voltage detection chip comprises a voltage input interface, a grounding interface and a voltage detection interface; the voltage input interface is connected with the resistance-capacitance voltage reduction half-wave rectifying circuit, the grounding interface is connected with the voltage reference point, and the voltage detection interface is connected with the voltage dividing circuit.
Optionally, the voltage divider circuit includes:
one end of the first resistor is connected with the cathode of the first diode;
one end of the second resistor is connected with the other end of the first resistor, and the other end of the second resistor is connected with a voltage reference point;
the voltage detection interface is connected between the first resistor and the second resistor.
Optionally, the voltage detection circuit further includes a first capacitor for filtering, one end of the first capacitor is connected to the other end of the second resistor, and the other end of the first capacitor is connected to the voltage reference point.
Optionally, when the alternating current to be detected is a positive half cycle, the first diode is reversely biased to be cut off; and when the alternating current to be detected is in a negative half cycle, the first diode is conducted in a positive direction.
Optionally, the theoretical voltage value detected by the voltage detection interface is represented by the following formula:
V C =（V-V’-V D )×（R/R general assembly ）
Wherein, V C The theoretical voltage value detected by the voltage detection interface; v is the alternating voltage of the alternating current to be detected; v' is the output voltage of the RC step-down half-wave rectifier circuit, V D Is the turn-on voltage of the first diode; (R/R) General (1) ) Representing a voltage division percentage of the voltage division circuit.
Optionally, the resistance-capacitance step-down half-wave rectifier circuit includes:
a surge protection circuit comprising a varistor connected to a second terminal of the voltage input;
the resistance-capacitance voltage reduction circuit is connected with the surge protection circuit at one end and comprises a third resistor and a second capacitor which are connected in parallel;
the rectifying circuit with one end connected with the other end of the resistance-capacitance voltage reduction circuit comprises a second diode and a third diode, and the anode of the second diode and the cathode of the third diode are both connected with the other end of the resistance-capacitance voltage reduction circuit; the cathode of the second diode is connected with the first end of the voltage input end; the anode of the third diode is connected with the voltage reference point;
the voltage stabilizing circuit comprises a voltage stabilizing diode, wherein the cathode of the voltage stabilizing diode is connected with the first end of the voltage input end, and the anode of the voltage stabilizing diode is connected with the voltage reference point;
and the filter circuit comprises a third capacitor, one end of the third capacitor is connected with the cathode of the voltage stabilizing diode, and the other end of the third capacitor is connected with the voltage reference point.
Optionally, the voltage input interface is connected to a cathode of the zener diode.
Optionally, during a positive half cycle of the alternating current to be detected, the second diode is reversely biased to be turned off, and the third diode is turned on in a forward direction; and when the negative half cycle of the alternating current to be detected is carried out, the second diode is conducted in the forward direction, and the third diode is cut off in the reverse direction.
Optionally, when the voltage input end stops inputting the alternating current to be detected, the third resistor is used for discharging the second capacitor.
In a second aspect, an electronic device is provided, wherein the electronic device operates with ac power as a power source, and the electronic device includes the ac voltage detection circuit according to the first aspect.
The beneficial effect of this application lies in: the voltage detection circuit is provided with a voltage input end, a resistance-capacitance voltage reduction half-wave rectifying circuit connected with the voltage input end and a voltage detection circuit connected with the resistance-capacitance voltage reduction half-wave rectifying circuit in parallel; the problem that the occupied installation space is large when a transformer is used for alternating current-direct current conversion in the existing alternating voltage detection circuit can be solved; because the resistance-capacitance voltage reduction half-wave rectification circuit is a non-isolated circuit structure, the occupied space is small, and the installation space of the alternating voltage detection circuit can be saved.
The foregoing description is only an overview of the technical solutions of the present application, and in order to make the technical solutions of the present application more clear and clear, and to implement the technical solutions according to the content of the description, the following detailed description is made with reference to the preferred embodiments of the present application and the accompanying drawings.
Drawings
Fig. 1 is a schematic structural diagram of an ac voltage detection circuit according to an embodiment of the present application.
Detailed Description
The following detailed description of embodiments of the present application will be described in conjunction with the accompanying drawings and examples. The following examples are intended to illustrate the present application, but are not intended to limit the scope of the present application.
Fig. 1 is a schematic structural diagram of an ac voltage detection circuit according to an embodiment of the present application, and as shown in fig. 1, the ac voltage detection circuit at least includes: the voltage-stabilizing circuit comprises a voltage input end 1, a resistance-capacitance voltage-reducing half-wave rectifying circuit 2 and a voltage detection circuit 3.
The voltage input 1 is used for inputting alternating current to be detected. The voltage input terminal includes a first terminal 11 and a second terminal 12.
In one example, the ac voltage is a mains voltage, which may be an ac voltage (or effective voltage) of 220 volts (V).
In the positive half period of the alternating current, a first end 11 is a positive pole, and a second end 12 is a negative pole; the first terminal 11 is negative and the second terminal 12 is positive during the negative half-cycle of the alternating current.
The resistance-capacitance voltage reduction half-wave rectification circuit 2 is connected with the voltage input end 1. The resistance-capacitance voltage reduction half-wave rectification circuit 2 is a non-isolated half-wave rectification circuit.
The non-isolated circuit is an isolated circuit, and the isolated circuit is a circuit in which a gap exists in a component and rectification is realized by means of electromagnetic induction, photoelectric induction or the like. Such as: ac-dc conversion is achieved by a transformer (i.e. electromagnetic induction between the primary and secondary coils).
The resistance-capacitance voltage reduction half-wave rectification circuit 2 comprises a surge protection circuit 21, a resistance-capacitance voltage reduction circuit 22, a rectification circuit 23, a voltage stabilizing circuit 24 and a filter circuit 25.
The surge protection circuit 21 suppresses a surge voltage, and prevents an excessive current from affecting a subsequent circuit.
Optionally, surge protection circuit 21 includes a voltage dependent resistor R1 connected to second terminal 12 of voltage input terminal 1. The voltage dependent resistor R1 is a current limiting resistor.
The rc step-down circuit 22 is used to limit the maximum operating current of the circuit based on the capacitive reactance generated by the capacitor under the ac signal. One end of the resistor-capacitor voltage reduction circuit 22 is connected to the surge protection circuit 21, and the other end is connected to the rectifier circuit 23.
The rc step-down circuit 22 includes a third resistor R2 and a second capacitor C1 connected in parallel. The second capacitor C1 is a step-down capacitor. When the voltage input end stops inputting the alternating current to be detected, the third resistor R2 is used for discharging the second capacitor C1.
The rectification circuit 23 adopts a half-wave rectification mode, and the current utilization rate of half-wave rectification is half of that of full-wave rectification. In this embodiment, the rectifying circuit 23 includes a second diode D1 and a third diode D2, and both the anode of the second diode D1 and the cathode of the third diode D2 are connected to the other end of the resistor-capacitor voltage-reducing circuit 22; the cathode of the second diode D1 is connected to the first end 11 of the voltage input terminal; the anode of the third diode D2 is connected to a voltage reference point.
The voltage reference point may also be referred to as a ground point, a relative ground point, or a common reference point, and the present embodiment does not limit the name of the voltage reference point.
The voltage stabilizing circuit 24 is used for stabilizing voltage by the current limiting function of the zener diode. In this embodiment, the voltage stabilizing circuit 24 includes a zener diode ZD1, and a cathode of the zener diode ZD1 is connected to the first end 11 of the voltage input terminal, and an anode thereof is connected to the voltage reference point.
The filter circuit 25 is configured to filter the rectified pulsating direct current. In this embodiment, the filter circuit 25 includes a third capacitor C2, and one end of the third capacitor C2 is connected to the negative electrode of the zener diode ZD1, and the other end is connected to the voltage reference point.
The voltage detection circuit 3 is connected in parallel with the resistance-capacitance voltage reduction half-wave rectification circuit 2. The resistance-capacitance voltage reduction half-wave rectification circuit 2 is used for supplying power to the voltage detection circuit 3; in other words, the voltage detection circuit 3 serves as one of the loads of the resistance-capacitance step-down half-wave rectification circuit 2.
The voltage detection circuit 3 is used to detect the mains voltage by detecting the average value of the voltage of the ac half-cycle. In this embodiment, the voltage detection circuit 3 includes a first diode D3, a voltage division circuit 32, and a voltage detection chip U1.
The first diode D3 has an anode connected to the second terminal 12 of the voltage input terminal 1 and a cathode connected to the voltage divider circuit 32.
The voltage dividing circuit 32 is used to divide the input voltage. In this embodiment, the voltage divider circuit 32 includes a first resistor R3 and a second resistor R4. One end of the first resistor R3 is connected with the cathode of the first diode D3; one end of the second resistor R4 is connected with the other end of the first resistor R3, and the other end of the second resistor R4 is connected with a voltage reference point.
The voltage detection chip U1 is used for voltage detection. The voltage detection chip U1 includes a voltage Input interface, a ground interface, and a voltage detection interface (Input/Output, I/O); the voltage input interface is connected with the resistance-capacitance voltage reduction half-wave rectifying circuit, the grounding interface is connected with a voltage reference point, and the voltage detection interface is connected with the voltage dividing circuit 32. In the present embodiment, the voltage detection interface I/O is connected between the first resistor R3 and the second resistor R4.
The voltage detecting chip U1 is a chip having an Analog-to-Digital Converter (ADC) function. An ADC refers to a device that converts a continuously varying analog signal into a discrete digital signal. The analog signal is a voltage signal in this embodiment. The voltage detection chip U1 may be a single chip microcomputer (or micro controller Unit, MCU)).
The voltage detection circuit 3 further includes a first capacitor C3 for filtering, one end of the first capacitor C3 is connected to the other end of the second resistor R4, and the other end of the first capacitor C3 is connected to a voltage reference point.
The theoretical voltage value detected by the voltage detection interface I/O is represented by the following formula:
V C =（V-V’-V D )×（R/R general assembly ）
Wherein, V C A theoretical voltage value detected for the voltage detection interface I/O; v is the alternating voltage (or effective voltage, such as 220V) of the alternating current to be detected; v' is the output voltage of the RC step-down half-wave rectifier circuit (5V is shown in FIG. 1 as an example), V D Is the turn-on voltage of the first diode; (R/R) General assembly ) Representing the percentage of voltage division by voltage divider circuit 32.
According to the voltage dividing circuit 32 shown in fig. 1, the voltage dividing percentage = R4/(R3 + R4).
The voltage input interface is connected with the cathode of a voltage stabilizing diode ZD1 in the resistance-capacitance voltage reduction half-wave rectification circuit 2.
The working principle of the alternating voltage detection circuit provided by the application comprises the following steps:
in the positive half period of the alternating current to be detected, the second diode D1 is reversely biased to be cut off, the third diode D2 is forwardly conducted, and the first diode D3 is reversely biased to be cut off; at this time, the first terminal 11- > ZD1- > D2- > C1- > R1- > of the voltage input terminal 1 constitutes a half-wave rectification circuit at the second terminal 12 of the voltage input terminal 1; the voltage detection circuit cannot detect the voltage, and the voltage detection result of the voltage detection circuit 3 is 0V. At this time, U1 is connected as a load to both ends of ZD 1.
In the negative half period of the alternating current to be detected, the second diode D1 is conducted in the forward direction, the third diode D2 is reversely biased to be cut off, and the first diode D3 is conducted in the forward direction; at this time, the second terminal 12- > D3- > R3- > R4- > ZD1- > of the voltage input terminal 1 constitutes a voltage detection circuit. The second terminal 12- > R1- > C1- > D1- > of the voltage input terminal 1 constitutes a half-wave rectification circuit. At this time, U1 can detect a voltage, which is the potential at point C.
Taking the example that the mains voltage is 220V, the dc voltage value provided by the rc step-down half-wave rectifier circuit 2 is 5V, the on voltage of D3 is 0.7V, the resistance of R3 is 5.6K Ω, and the resistance of R4 is 510K Ω, the theoretical voltage value detected by U1 is: VC = (220V-5V-0.7V) × (5.6K/(510K + 5.6K)) ≈ 2.259V. For a scene with a mains voltage range of 220V +/-10% (i.e. 210V to 230V), the range of the detected theoretical voltage value corresponding to U1 is [2.150V,2.367V ].
Optionally, the MCU has a voltage comparison function, and a standard voltage range (e.g., [2.150V,2.367V ]) is pre-stored in the MCU. After the MCU detects the voltage, comparing the detected voltage with a voltage standard range, and determining that the mains supply voltage is abnormal when the detected voltage is not in the voltage standard range; and when the detected voltage is within the voltage standard range, determining that the mains voltage is normal.
It should be added that the circuit structure shown in fig. 1 is only schematic, and in practical implementation, the circuit may include more elements to implement the same circuit function, and this embodiment is not listed here.
In summary, the alternating voltage detection circuit provided in this embodiment is configured with a voltage input end, a resistance-capacitance step-down half-wave rectification circuit connected to the voltage input end, and a voltage detection circuit connected in parallel to the resistance-capacitance step-down half-wave rectification circuit; the problem that the occupied installation space is large when a transformer is used for alternating current-direct current conversion in the existing alternating voltage detection circuit can be solved; because the resistance-capacitance voltage reduction half-wave rectification circuit is a non-isolated circuit structure, the occupied space is small, and the installation space of the alternating voltage detection circuit can be saved.
In addition, the voltage detection circuit is arranged to directly detect the alternating current, and the alternating current is not converted into the direct current and then detected; therefore, an alternating current-direct current conversion circuit does not need to be arranged in the voltage detection backflow, the complexity of the circuit structure can be reduced, and the voltage detection efficiency is improved.
Based on the foregoing embodiments, this embodiment further provides an electronic device, which operates with ac power as a power supply, and includes the ac voltage detection circuit provided in each of the foregoing embodiments.
Alternatively, the electronic device may be an electric appliance such as a blower, a refrigerator, a television, or the like, which is connected to the commercial power, and the present embodiment does not limit the device type of the electronic device.
All possible combinations of the technical features of the above embodiments may not be described for the sake of brevity, but should be considered as within the scope of the present disclosure as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (6)

1. An alternating voltage detection circuit, characterized in that the alternating voltage detection circuit comprises:
the voltage input end is used for inputting alternating current to be detected and comprises a first end and a second end;
the resistance-capacitance voltage reduction half-wave rectifying circuit is connected with the voltage input end;
a voltage detection circuit connected in parallel with the resistance-capacitance step-down half-wave rectification circuit, the voltage detection circuit comprising:
the anode of the first diode is connected with the second end of the voltage input end;
a voltage divider circuit connected to a cathode of the first diode, the voltage divider circuit comprising: one end of the first resistor is connected with the cathode of the first diode; one end of the second resistor is connected with the other end of the first resistor, and the other end of the second resistor is connected with a voltage reference point; the voltage detection interface is connected between the first resistor and the second resistor;
the voltage detection chip comprises a voltage input interface, a grounding interface and a voltage detection interface; the voltage input interface is connected with the resistance-capacitance voltage reduction half-wave rectification circuit, the grounding interface is connected with a voltage reference point, and the voltage detection interface is connected with the voltage division circuit;
the resistance-capacitance step-down half-wave rectifier circuit comprises:
a surge protection circuit comprising a varistor connected to the second end of the voltage input;
the resistance-capacitance voltage reduction circuit is connected with the surge protection circuit at one end and comprises a third resistor and a second capacitor which are connected in parallel;
the rectifying circuit is connected with one end of the resistance-capacitance voltage reduction circuit and the other end of the resistance-capacitance voltage reduction circuit, and comprises a second diode and a third diode, wherein the anode of the second diode and the cathode of the third diode are both connected with the other end of the resistance-capacitance voltage reduction circuit; the cathode of the second diode is connected with the first end of the voltage input end; the anode of the third diode is connected with the voltage reference point;
the voltage stabilizing circuit comprises a voltage stabilizing diode, wherein the cathode of the voltage stabilizing diode is connected with the first end of the voltage input end, and the anode of the voltage stabilizing diode is connected with the voltage reference point;
the filter circuit comprises a third capacitor, one end of the third capacitor is connected with the cathode of the voltage stabilizing diode, and the other end of the third capacitor is connected with the voltage reference point;
in the positive half cycle of the alternating current to be detected, the second diode is reversely biased to be cut off, the third diode is positively conducted, and the first diode is reversely biased to be cut off; the first end of the voltage input end, the voltage stabilizing diode, the third diode, the second capacitor, the voltage dependent resistor and the second end of the voltage input end form a half-wave rectification loop; the voltage detection circuit does not detect voltage, and the voltage detection chip is connected to two ends of the piezoresistor as a load;
in the negative half period of the alternating current to be detected, the second diode is in forward conduction, the third diode is in reverse bias cutoff, and the first diode is in forward conduction; the second end of the voltage input end, the first diode, the first resistor, the second diode and the first end of the voltage input end form a voltage detection loop; the second end of the voltage input end, the piezoresistor, the second capacitor, the second diode and the first end of the voltage input end form a half-wave rectification loop; the voltage detection chip detects voltage.
2. The ac voltage detection circuit according to claim 1, further comprising a first capacitor for filtering, one end of the first capacitor being connected to one end of the second resistor, and the other end of the first capacitor being connected to the voltage reference point.
3. The ac voltage detection circuit according to claim 1, wherein the theoretical voltage value detected by the voltage detection interface is represented by the following equation:
V C ＝(V-V’-V D )×(R/R general assembly )
Wherein, V C The theoretical voltage value detected by the voltage detection interface; v is the alternating voltage of the alternating current to be detected; v' is the output voltage of the RC step-down half-wave rectifier circuit, V D Is the turn-on voltage of the first diode; R/R General assembly Representing the percentage of the voltage division circuit.
4. The ac voltage detection circuit according to claim 1, wherein the voltage input interface is connected to a cathode of the zener diode.
5. The ac voltage detection circuit according to claim 1, wherein the third resistor is configured to discharge the second capacitor when the voltage input terminal stops inputting the ac power to be detected.
6. An electronic device operating on ac power, comprising the ac voltage detection circuit according to any one of claims 1 to 5.
CN202010703101.0A 2020-07-21 2020-07-21 Alternating voltage detection circuit and electronic device Active CN111736004B (en)

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CN102012452B (en) * 2010-11-12 2013-03-13 深圳和而泰智能控制股份有限公司 Method, device and circuit for detecting alternating voltage
CN202503439U (en) * 2012-04-27 2012-10-24 佛山市顺德区瑞德电子实业有限公司 Capacitance-resistance voltage reduction circuit of low power supply
CN104500429B (en) * 2014-11-20 2016-08-24 广州腾世智能控制系统有限公司 The speed-regulating control device of the split-pole blower fan of gas-heating water heater and method
CN204610329U (en) * 2015-05-20 2015-09-02 杭州嘉通机械有限公司 A kind of Industrial fan
CN205867119U (en) * 2016-06-14 2017-01-11 苍南东棋电器有限公司 Be applied to medicine decocting device's control circuit and medicine decocting device
CN208270643U (en) * 2018-04-16 2018-12-21 广东美的生活电器制造有限公司 A kind of ac voltage detection circuit, equipment and food cooking machine
JP2019184582A (en) * 2018-03-30 2019-10-24 ダイキン工業株式会社 Voltage detection circuit, voltage monitoring circuit, cooling device, and container cooling device
CN208383974U (en) * 2018-08-01 2019-01-15 周厚祖 A kind of ac detector
CN210038488U (en) * 2019-06-11 2020-02-07 宁波环海电器有限公司 Touch type electric iron control circuit

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