CN113937738A - Overvoltage protection unit and overvoltage protection method for input alternating-current power supply and air conditioner - Google Patents
Overvoltage protection unit and overvoltage protection method for input alternating-current power supply and air conditioner Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/20—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess voltage
Abstract
The invention relates to the technical field of alternating current power supply overvoltage protection, in particular to an input alternating current power supply overvoltage protection unit, an overvoltage protection method and an air conditioner. An input AC power supply overvoltage protection unit includes: the device comprises a power supply voltage reduction module, a voltage detection module and a load protection module. The power supply voltage reduction module inputs external alternating-current voltage and outputs 12V voltage through a first output end; the voltage detection module inputs an external power supply voltage VacAfter passing through the voltage detection module, a comparison output voltage V is generateds(ii) a And the load protection module is electrically connected with an external power supply and is connected with a load through a power output end. The load protection module comprises an on-off device for comparing the output voltage VsObtaining the external power supply voltage V according to the comparison result with the specified voltage valueacThe judgment result of whether the overvoltage exists controls the electric connection and disconnection of the on-off device. The invention relates to an overvoltage protection unit for an input alternating current power supply, which is provided withThe following advantages are: and voltage overpressure is avoided, and electric appliances are prevented from being damaged.
Description
Technical Field
The invention relates to the technical field of alternating current power supply overvoltage protection, in particular to an input alternating current power supply overvoltage protection unit, an overvoltage protection method and an air conditioner.
Background
At present, electric appliances such as air conditioners have been widely spread and the kinds of electric appliances have been increasing with the development of science and technology, and for example, in homes, many of the housework that has been performed by manual operation, by gas burners, and the like are now performed by various electric appliances. However, as the number of home appliances increases, the amount of electricity used is also increased, resulting in unstable voltage.
Most industrial areas and some urban business centers and residential household power supplies, whether for household or public use, are currently three-phase power supplies with 380V line voltage and 220V phase voltage. Most of air conditioners sold in the market adopt a single-phase power supply mode, often can be mistakenly connected with a three-phase power supply during after-sale installation due to misoperation and the like, the input air conditioner power supply voltage is 380V and is far higher than the rated voltage 220V, and an internal working circuit of the air conditioner is damaged due to the fact that the internal working circuit of the air conditioner cannot bear the three-phase voltage.
Disclosure of Invention
In view of the above, the present invention is directed to an input ac power overvoltage protection unit, which adopts an input ac power overvoltage protection unit, and a voltage detection and comparison circuit is disposed in the input ac power overvoltage protection unit, so as to monitor and determine whether a voltage exceeds a specified voltage in real time, perform an overvoltage protection operation according to a situation, and solve the problems of voltage overvoltage, damage to an electrical appliance, and the like.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
an input ac power supply overvoltage protection unit, comprising: the power supply voltage reduction module comprises a first input end and a first output end, wherein the first input end is electrically connected with an external power supply, and external alternating-current voltage is input through the first input end and 12V voltage is output through the first output end;
the voltage detection module comprises a second input end and a second output end, and the second input end is electrically connected with the external power supply;
through the second input endVoltage V of external power supplyacA comparison output voltage V is generated after passing through the voltage detection modules；
A load protection module electrically connected to the external power source and electrically connected to the first output terminal and the second output terminal. The load protection module is provided with a power supply output end and is connected with a load through the power supply output end;
the load protection module comprises an on-off device, one end of the on-off device is connected with a live wire of the external power supply, and the other end of the on-off device is electrically connected with the load;
by comparing the output voltage VsObtaining the external power supply voltage V according to the comparison result with the specified voltage valueacAnd controlling the electric connection and disconnection of the on-off device according to the judgment result of whether the overvoltage exists.
Further, the external power supply voltage VacThe peak voltage V is obtained after the voltage is stabilized by a first capacitor through a first rectifying elementdc。
Further, a first capacitor is connected in parallel with a first resistor and a second resistor connected in series, and a voltage detection output signal V is obtained at a connection point between the two resistorss；
VsAnd VacThe relationship of (1) is:
furthermore, the voltage detection module also comprises a controllable precise voltage stabilization source, and the voltage detection output signal VsThe voltage is output to the controllable precise voltage-stabilizing source, and the other end of the controllable precise voltage-stabilizing source is the second output end;
by comparison of VsAnd controlling the on-off of the controllable precise voltage-stabilizing source according to the result of the comparison with the specified voltage value.
Further, the power supply voltage reduction module comprises a second capacitor, a second rectifying element, a third rectifying element, an electrolytic capacitor and a 12V voltage stabilizing diode;
one end of the third rectifying element, one end of the electrolytic capacitor and one end of the 12V voltage stabilizing diode which are connected in parallel are connected with the ground.
Further, the on-off device is a normally closed relay.
Furthermore, the load protection module further comprises a triode and a third resistor and a fourth resistor which are connected in series;
the emitter of the triode and the first end of the third resistor are connected to the first output end;
the collector of the triode is electrically connected with the on-off device;
the first end of the fourth resistor is connected with the second output end;
and the connecting end of the second end of the third resistor and the second end of the fourth resistor is connected with the base electrode of the triode.
An input alternating current power supply overvoltage protection method is characterized in that the method for performing overvoltage protection through the input alternating current power supply overvoltage protection unit comprises the following steps:
s100, generating 12V voltage, limiting and reducing the voltage of an input external power supply through a second capacitor (C1) in a power supply voltage reduction module (100), performing half-wave rectification on alternating current through a second rectification element (D1), and performing reverse breakdown on a voltage regulator tube (Q1) when the voltage of two ends of the voltage regulator tube is higher than 12V, so that the voltage of the voltage regulator tube (Q1) is clamped at 12V;
s200, detecting external power supply voltage, detecting a power supply voltage value input from the outside through a voltage detection module, and judging whether the external power supply voltage exceeds a specified voltage value;
and S300, controlling the on-off of the normally closed relay according to the judged overvoltage result of the external power supply voltage, and realizing overvoltage protection.
Further, in step S200, the method includes:
s210, half-wave rectification is carried out on the alternating voltage Vac through a first rectifying element (D2);
s220, voltage stabilization is carried out through a first capacitor (C2), and the voltage value Vdc of two ends of the first capacitor (C2) is alternating voltage VacPeak, voltage sense output signal ofVsMeasure Vdc、Vs、VacThe relationship between them is:
obtaining formula (1) through formula (2) and formula (3);
s230, inputting a reference voltage VsWhen the voltage is more than 2.5V, the cathode and the anode are conducted; when the reference voltage V is inputtedsWhen the voltage is less than or equal to 2.5V, the cathode and the anode are disconnected.
An air conditioner comprising:
the input alternating current power supply overvoltage protection unit is any one of the input alternating current power supply overvoltage protection units;
the input alternating current power supply overvoltage protection unit is arranged in the air conditioner and comprises a power supply input end and a power supply output end, the power supply input end is connected with an external power supply, the power supply output end is a third output end, and the third output end is electrically connected with the power supply input end of the air conditioner.
Compared with the prior art, the overvoltage protection unit for the input alternating-current power supply has the following advantages:
the technical scheme has the advantages that the input alternating current power supply overvoltage protection unit is adopted, the voltage detection and comparison circuit is arranged in the unit, whether the voltage exceeds the specified voltage or not is monitored and judged in real time, overvoltage protection operation is carried out according to conditions, voltage overvoltage is avoided, and electric appliances are prevented from being damaged.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic circuit diagram of an input ac power supply overvoltage protection unit according to an embodiment of the present invention.
Description of reference numerals:
100-power supply voltage reduction module, 200-voltage detection module, 300-load protection module, 310-on-off device, C1-second capacitor, C2-first capacitor, D1-second rectifying element, D2-first rectifying element, D3-third rectifying element, E1-electrolytic capacitor, Q1-voltage regulator tube, Q2-triode, R2-third resistor, R3-fourth resistor, R4-first resistor, R5-second resistor, TL 431-controllable precise voltage regulation source, connection point of E-R4 and R5, f-second output end, g-first output end, and connection point between h-R2 and R3.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The descriptions in this document referring to "first", "second", "upper", "lower", etc. are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," "upper," "lower," may explicitly or implicitly include at least one of the feature. In addition, the technical solutions in the embodiments may be combined with each other, but it is necessary that a person skilled in the art can realize the combination, and the technical solutions in the embodiments are within the protection scope of the present invention.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
As shown in fig. 1, an input ac power supply overvoltage protection unit is characterized by comprising:
the power supply voltage reduction module 100 comprises a first input end and a first output end g, wherein the first input end is electrically connected with an external power supply, and external alternating-current voltage is input through the first input end and 12V voltage is output through the first output end g;
the voltage detection module 200 comprises a second input end and a second output end f, wherein the second input end is electrically connected with the external power supply;
an external power supply voltage Vac is input through the second input end, and a comparison output voltage Vs is generated after the external power supply voltage Vac passes through the voltage detection module;
and a load protection module 300 electrically connected to the external power source and to the first output terminal g and the second output terminal f. The load protection module 300 is provided with a power output terminal through which a load is connected.
The load protection module comprises an on-off device 310, wherein one end of the on-off device 310 is connected with a live wire of the external power supply, and the other end of the on-off device 310 is electrically connected with the load;
and obtaining a judgment result of whether the external power supply voltage Vac is over-voltage or not according to a comparison result of the comparison output voltage Vs and a specified voltage value, and controlling the electric connection and disconnection action of the on-off device.
The input external power voltage is stepped down to 12V by the power step-down module 100 and input to the load protection module 300, for controlling the on/off of the on/off switch 310. The voltage detection module 200 detects and compares whether the voltage input to the load protection module 300 exceeds 12V, and if the voltage is judged to be less than or equal to 12V, it indicates that the external power voltage is kept within the range of the commercial power allowable threshold of 22V, and the on-off device 310 is kept closed. If the voltage is judged to be greater than 12V, which indicates that the external power supply voltage exceeds the 220V commercial power allowable threshold range, the input voltage is considered to be in overvoltage, and the load protection module 300 controls the on-off device 310 to be switched off, so that the power supply of the external power supply to the load is cut off. The overvoltage protection unit of the input alternating-current power supply is adopted, the voltage detection and comparison circuit is arranged in the overvoltage protection unit, whether the voltage exceeds the specified voltage or not is monitored and judged in real time, overvoltage protection operation is carried out according to conditions, voltage overvoltage is avoided, and electric appliances are prevented from being damaged.
Specifically, the external power supply voltage VacThe peak voltage V is obtained after the voltage is stabilized by the first capacitor C2 through the first rectifying element D2dc。
The first rectifying element D2 is used for rectifying the alternating voltage VacThe voltage value Vdc of the first capacitor C2 is the peak value of the ac voltage Vac by performing half-wave rectification and stabilizing the voltage by the first capacitor C2.
The first capacitor C2 is connected in parallel with a first resistor R4 and a second resistor R5 which are connected in series, and a voltage detection output signal V is obtained at a connection point e between the two resistorss。
VsAnd VacThe relationship of (1) is:
wherein V is measureddcAnd VsAnd VacThe relationship between them is as shown in the following equations 2 and 3
Equation 1 is derived from equations 2 and 3.
Further, the voltage detection module further includes a controllable precision voltage-stabilizing source TL431, the voltage detection output signal Vs is output to the controllable precision voltage-stabilizing source TL431, and the other end of the controllable precision voltage-stabilizing source TL431 is the second output end f. By comparison of VsAnd controlling the on-off of the controllable precise voltage-stabilizing source TL431 according to the comparison result of the specified voltage value.
According to the characteristics of the controllable precise voltage-stabilizing source TL431, when the reference voltage V is inputsWhen the voltage is more than 2.5V, the cathode and the anode are conducted; when the reference voltage V is inputtedsWhen the voltage is less than or equal to 2.5V, the cathode and the anode are disconnected. As an example, R4 may be 5.1K and R5 may be 700K, as calculated by equation 1, i.e., when V isacTL431 cathode and anode are conducted when the voltage is more than 244V; when V isacWhen the voltage is less than or equal to 244V, the TL431 cathode and the TL431 anode are disconnected.
Specifically, the power supply voltage reduction module comprises a second capacitor C1, a second rectifying element D1, a third rectifying element D3, an electrolytic capacitor E1 and a 12V voltage stabilizing diode Q1. One end of the third rectifying element D3, one end of the electrolytic capacitor E1 and one end of the 12V voltage stabilizing diode which are connected in parallel are connected with the ground.
The second capacitor C1 is a film capacitor, and since the second capacitor C1 can pass an alternating current, its equivalent impedance when an alternating voltage is applied across its two ends is 1/2 Π fC. Wherein f is an ac power frequency, a common commercial power is 50Hz, a C1 capacitor is selected according to actual requirements, as an embodiment, in this embodiment, 1uF is taken as C1, and C1 impedance Z is calculated to 1/2 Π 50Hz 1uF is 3.185K Ω, when a line voltage V between zero and live lines is inputacAt 220V, the maximum current I flowing through C1 is 220V/Z220V/3.185K 69 mA. Therefore, the second capacitor C1 functions as a current limiting and voltage reducing circuit in the present circuit.
The second rectifying element D1 functions to half-wave rectify the stepped-down alternating current. When the voltage at the two ends of the voltage regulator tube Q1 is higher than 12V, the voltage regulator tube breaks down reversely, so that the voltage of the Q1 is clamped at 12V. Due to the current limiting effect of the second capacitor C1, the reverse breakdown peak current of the voltage regulator tube Q1 is smaller than Vac/Z, so that the breakdown due to overcurrent is avoided. The electrolytic capacitor E1 is used for voltage stabilization and filtering, and prevents the 12V voltage from generating large fluctuation, and the size of the electrolytic capacitor E1 is selected according to actual requirements, and 470uF is selected in the column. The third rectifying element D3 is used to provide a conducting loop during the negative half cycle of the ac voltage. The second rectifying elements D1, ZD2 may be selected from conventional rectifying diodes such as 1N 4007.
Preferably, the on-off device 310 is a normally closed relay.
The load protection module 300 further includes a transistor Q2 and a third resistor R2 and a fourth resistor R3 connected in series. An emitter of the transistor Q2 and a first terminal of the third resistor R2 are connected to the first output terminal g. The collector of the transistor Q2 is electrically connected to the switch 310. The first end of the fourth resistor R3 is connected to the second output terminal f. A connection end h where the second end of the third resistor R2 and the second end of the fourth resistor R3 are connected is connected with the base of the transistor Q2.
The load on the zero line of the external input power supply is controlled by a normally closed relay, when the input alternating voltage is overvoltage, the normally closed relay acts and is disconnected, the load is not electrified, and overvoltage protection is realized. Whether the normally closed relay acts or not is controlled by a PNP triode Q2.
When the AC voltage is higher than the protection voltage value 244V: the cathode and the anode of the TL431 are conducted, the resistors R2 and R3 divide the voltage of a 12V power supply and then input into the base electrode of the triode, and the base voltage of the triode Q2 is lower than the emitting electrode, so that the conduction is realized, the normally closed relay acts, an electric shock is cut off, the load cannot be electrified, and the overvoltage protection is realized;
when the AC voltage is lower than the protection voltage value 244V, the cathode and the anode of the TL431 are disconnected, the voltage of the base electrode of the triode Q2 is equal to the voltage of the emitter, the triode is not conducted, the normally closed relay keeps a pull-in state, and the load is normally electrified.
An input alternating-current power supply overvoltage protection method, which is a method for performing overvoltage protection through any one of the input alternating-current power supply overvoltage protection units, includes:
s100, generating 12V voltage, limiting and reducing the voltage of an input external power supply through a second capacitor C1 in the power supply voltage reduction module 100, performing half-wave rectification on alternating current through a second rectification element D1, and performing reverse breakdown on a voltage regulator tube when the voltage of two ends of the voltage regulator tube Q1 is higher than 12V, so that the voltage of the voltage regulator tube Q1 is clamped at 12V;
s200, detecting external power supply voltage, detecting a power supply voltage value input from the outside through a voltage detection module, and judging whether the external power supply voltage exceeds a specified voltage value;
s210, half-wave rectifying the ac voltage Vac by the first rectifying element D2;
s220, stabilizing voltage through a first capacitor C2, wherein the voltage value V at two ends of the first capacitor C2dcIs an alternating voltage VacPeak value, voltage detection output signal is VsMeasure Vdc、Vs、VacThe relationship between them is:
obtaining formula 1 through formula 2 and formula 3;
s230, inputting a reference voltage VsWhen the voltage is more than 2.5V, the cathode and the anode are conducted; when the reference voltage V is inputtedsWhen the voltage is less than or equal to 2.5V, the cathode and the anode are disconnected.
And S300, controlling the on-off of the normally closed relay according to the judged overvoltage result of the external power supply voltage, and realizing overvoltage protection.
An air conditioner comprising: the input alternating current power supply overvoltage protection unit is the input alternating current power supply overvoltage protection unit.
The input alternating current power supply overvoltage protection unit is arranged in the air conditioner and comprises a power supply input end and a power supply output end, the power supply input end is connected with an external power supply, the power supply output end is a third output end, and the third output end is electrically connected with the power supply input end of the air conditioner.
The overvoltage protection unit of the input alternating-current power supply plays an overvoltage protection role for the air conditioner, a voltage detection and comparison circuit is arranged in the unit, whether the voltage exceeds the specified voltage or not is monitored and judged in real time, overvoltage protection operation is carried out according to conditions, voltage overvoltage is avoided, and electric appliances are prevented from being damaged.
Preferably, the input ac power overvoltage protection unit can be arranged in the air conditioner as a circuit board, an input end of the input ac power overvoltage protection unit is connected with a power plug and connected with the mains supply, and the other end of the input ac power overvoltage protection unit is connected with an input power terminal of the air conditioner, so that the input power terminal is controlled to be powered on or powered off through a relay.
Or the input alternating current power supply overvoltage protection unit can be manufactured into an independent device, one end of the device is connected with a power plug, the other end of the device is manufactured into a power jack mode, and a power line of the air conditioner is plugged into the power jack for use.
The overvoltage protection unit for the input alternating current power supply can also be applied to any electric appliance.
As another embodiment, the input ac power overvoltage protection unit may be disposed in a wall outlet, a patch panel, or the like.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (10)
1. An input alternating current power supply overvoltage protection unit, comprising:
the power supply voltage reduction module (100) comprises a first input end and a first output end (g), wherein the first input end is electrically connected with an external power supply, and an external alternating current voltage is input through the first input end and a 12V voltage is output through the first output end (g);
a voltage detection module (200) comprising a second input and a second output (f), the second input being electrically connected to the external power supply;
inputting an external power supply voltage V through the second input terminalacA comparison output voltage V is generated after passing through the voltage detection modules；
And a load protection module (300) electrically connected to the external power source and to the first output terminal g and the second output terminal f. The load protection module (300) is provided with a power supply output end, and is connected with a load through the power supply output end;
the load protection module comprises an on-off device (310), one end of the on-off device (310) is connected with a live wire of the external power supply, and the other end of the on-off device is electrically connected with the load;
by comparing the output voltage VsObtaining the external power supply power according to the comparison result with the specified voltage valuePressure VacAnd controlling the electric connection and disconnection of the on-off device according to the judgment result of whether the overvoltage exists.
2. The input AC power supply overvoltage protection unit according to claim 1,
the external power supply voltage VacThe peak voltage V is obtained after the voltage is stabilized by a first capacitor (C2) through a first rectifying element (D2)dc。
3. The input AC power supply overvoltage protection unit according to claim 2,
a first capacitor (C2) is connected in parallel with a first resistor (R4) and a second resistor (R5) connected in series, and a voltage detection output signal V is obtained at a connection point (e) between the two resistorss；
VsAnd VacThe relationship of (1) is:
4. the input AC power supply overvoltage protection unit according to claim 3,
the voltage detection module further comprises a controllable precise voltage-stabilizing source (TL431), and the voltage detection output signal VsThe voltage is output to the controllable precise voltage-stabilizing source (TL431), and the other end of the controllable precise voltage-stabilizing source (TL431) is the second output end (f);
by comparison of VsAnd the result of the comparison with the specified voltage value controls the on-off of the controllable precise voltage-stabilizing source (TL 431).
5. The input AC power supply overvoltage protection unit according to claim 4,
the power supply voltage reduction module comprises a second capacitor (C1), a second rectifying element (D1), a third rectifying element (D3), an electrolytic capacitor (E1) and a 12V voltage stabilizing diode (Q1);
wherein one end of the third rectifying element (D3), one end of the electrolytic capacitor (E1) and one end of the 12V voltage stabilizing diode which are connected in parallel are electrically connected with the ground.
6. The input AC power supply overvoltage protection unit according to claim 1,
the on-off device (310) is a normally closed relay.
7. The input AC power supply overvoltage protection unit according to claim 6,
the load protection module further comprises a triode (Q2) and a third resistor (R2) and a fourth resistor (R3) which are connected in series;
an emitter of the transistor (Q2) and a first terminal of the third resistor (R2) are connected to the first output terminal (g);
a collector of the transistor (Q2) is electrically connected with the on-off device (310);
-the connection of the first terminal of the fourth resistor (R3) to the second output terminal (f);
the connection end (h) of the second end of the third resistor (R2) and the second end of the fourth resistor (R3) is connected with the base of the triode (Q2).
8. An input alternating current power supply overvoltage protection method is characterized in that the method for performing overvoltage protection through the input alternating current power supply overvoltage protection unit according to any one of claims 1 to 7 comprises the following steps:
s100, generating 12V voltage, limiting and reducing the voltage of an input external power supply through a second capacitor (C1) in a power supply voltage reduction module (100), performing half-wave rectification on alternating current through a second rectification element (D1), and performing reverse breakdown on a voltage regulator tube (Q1) when the voltage of two ends of the voltage regulator tube is higher than 12V, so that the voltage of the voltage regulator tube (Q1) is clamped at 12V;
s200, detecting external power supply voltage, detecting a power supply voltage value input from the outside through a voltage detection module, and judging whether the external power supply voltage exceeds a specified voltage value;
and S300, controlling the on-off of the normally closed relay according to the judged overvoltage result of the external power supply voltage, and realizing overvoltage protection.
9. The input AC power supply overvoltage protection method according to claim 8,
in step S200, the method includes:
s210, half-wave rectification is carried out on the alternating voltage Vac through a first rectifying element (D2);
s220, voltage stabilization is carried out through a first capacitor (C2), and the voltage value Vdc of two ends of the first capacitor (C2) is alternating voltage VacPeak value, voltage detection output signal is VsMeasure Vdc、Vs、VacThe relationship between them is:
obtaining formula (1) through formula (2) and formula (3);
s230, inputting a reference voltage VsWhen the voltage is more than 2.5V, the cathode and the anode are conducted; when the reference voltage V is inputtedsWhen the voltage is less than or equal to 2.5V, the cathode and the anode are disconnected.
10. An air conditioner, characterized by comprising:
the input alternating current power supply overvoltage protection unit is the input alternating current power supply overvoltage protection unit according to any one of claims 1 to 7;
the input alternating current power supply overvoltage protection unit is arranged in the air conditioner and comprises a power supply input end and a power supply output end, the power supply input end is connected with an external power supply, the power supply output end is a third output end, and the third output end is electrically connected with the power supply input end of the air conditioner.
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| CN205304215U (en) * | 2015-12-30 | 2016-06-08 | 芜湖美智空调设备有限公司 | Contactor protection control circuit and air conditioning equipment |
| CN206323125U (en) * | 2016-12-28 | 2017-07-11 | 广州视源电子科技股份有限公司 | A kind of AC overvoltage crowbars with auto-lock function |
| CN106972769A (en) * | 2017-05-16 | 2017-07-21 | 国网河南省电力公司平顶山供电公司 | A kind of light current electrical load overvoltage crowbar |
| CN207677431U (en) * | 2017-11-22 | 2018-07-31 | 合肥惠科金扬科技有限公司 | A kind of overvoltage crowbar and Switching Power Supply |
| US10044285B1 (en) * | 2018-01-16 | 2018-08-07 | Shenzhen Segre Electronic Co., Ltd | Alternating current conversion circuit |
-
2021
- 2021-10-14 CN CN202111197453.4A patent/CN113937738B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205304215U (en) * | 2015-12-30 | 2016-06-08 | 芜湖美智空调设备有限公司 | Contactor protection control circuit and air conditioning equipment |
| CN206323125U (en) * | 2016-12-28 | 2017-07-11 | 广州视源电子科技股份有限公司 | A kind of AC overvoltage crowbars with auto-lock function |
| CN106972769A (en) * | 2017-05-16 | 2017-07-21 | 国网河南省电力公司平顶山供电公司 | A kind of light current electrical load overvoltage crowbar |
| CN207677431U (en) * | 2017-11-22 | 2018-07-31 | 合肥惠科金扬科技有限公司 | A kind of overvoltage crowbar and Switching Power Supply |
| US10044285B1 (en) * | 2018-01-16 | 2018-08-07 | Shenzhen Segre Electronic Co., Ltd | Alternating current conversion circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113937738B (en) | 2023-11-28 |
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