CN113937738B - Overvoltage protection unit for input alternating current power supply, overvoltage protection method and air conditioner - Google Patents
Overvoltage protection unit for input alternating current power supply, overvoltage protection method and air conditioner Download PDFInfo
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- CN113937738B CN113937738B CN202111197453.4A CN202111197453A CN113937738B CN 113937738 B CN113937738 B CN 113937738B CN 202111197453 A CN202111197453 A CN 202111197453A CN 113937738 B CN113937738 B CN 113937738B
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- 238000000034 method Methods 0.000 title claims abstract description 12
- 238000001514 detection method Methods 0.000 claims abstract description 31
- 239000003990 capacitor Substances 0.000 claims description 39
- 230000000087 stabilizing effect Effects 0.000 claims description 39
- 230000006641 stabilisation Effects 0.000 claims description 3
- 238000011105 stabilization Methods 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
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- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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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
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Abstract
The application relates to the technical field of overvoltage protection of alternating current power supplies, in particular to an overvoltage protection unit, an overvoltage protection method and an air conditioner of an input alternating current power supply. An input ac power overvoltage protection unit comprising: the device comprises a power supply voltage reducing module, a voltage detecting module and a load protecting module. The power supply voltage reducing module inputs external alternating voltage and outputs 12V voltage through the first output end; the voltage detection module inputs an external power supply voltage V ac After passing through the voltage detection module, the voltage detection module generates a comparison output voltage V s The method comprises the steps of carrying out a first treatment on the surface of the 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; by comparing output voltage V s Comparing the voltage value with the specified voltage value to obtain an external power supply voltage V ac And (5) controlling the electric connection and disconnection of the on-off device according to the judgment result of whether the overvoltage exists. The overvoltage protection unit for the input alternating current power supply has the following advantages: and voltage overvoltage is avoided, and damage to the electric appliance is prevented.
Description
Technical Field
The application relates to the technical field of overvoltage protection of alternating current power supplies, in particular to an overvoltage protection unit, an overvoltage protection method and an air conditioner of an input alternating current power supply.
Background
Nowadays, electric appliances such as air conditioners have been widely popularized, and with the development of technology, the variety of electric appliances is increasing, for example, in the home, many households that have been manually operated in the past, performed by gas furnaces, etc. are now realized 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, as well as some urban commercial centers and residential home-entry power supplies are currently three-phase power supplies, whether household or public power supplies, with a line voltage of 380V and a phase voltage of 220V. Most of air conditioners sold in the market adopt a single-phase power supply mode, and often the three-phase power supply is connected by mistake during after-sale installation due to misoperation and the like, so that the power supply voltage of the input air conditioner is 380V, which is far higher than the rated voltage of 220V, and the internal working circuit of the air conditioner is damaged due to the fact that the three-phase voltage cannot be born.
Disclosure of Invention
In view of the above, the present application aims to provide an input ac power supply overvoltage protection unit, which adopts an input ac power supply overvoltage protection unit, and a voltage detection and comparison circuit is arranged in the input ac power supply overvoltage protection unit, so as to monitor and determine whether the voltage exceeds a specified voltage in real time, and perform overvoltage protection operation according to the situation, thereby solving the problems of overvoltage, damage to electrical appliances, etc.
In order to achieve the above purpose, the technical scheme of the application is realized as follows:
an input ac power overvoltage protection unit comprising: the power supply voltage reducing 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 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;
an external power supply voltage V is input through the second input end ac After passing through the voltage detection module, the voltage detection module generates a comparison output voltage V s ；
And the load protection module is electrically connected with the external power supply and is electrically connected with the first output end and the second output end. The load protection module is provided with a power output end, and is connected with a load through the power 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 V s Comparing the result with the appointed voltage value to obtain the external power supply voltage V ac And (5) controlling the electric connection and disconnection actions of the on-off device according to the judgment result of whether the overvoltage exists.
Further, the external power supply voltage V ac The peak voltage V is obtained after voltage stabilization through a first capacitor by a first rectifying element dc 。
Further, the first capacitor is connected in parallel with the first resistor and the second resistor which are connected in series, and is connected between the two resistorsThe junction between the resistors obtains a voltage detection output signal V s ；
V s And V ac The relation of (2) is:
further, the voltage detection module further comprises a controllable precise voltage stabilizing source, and the voltage detection output signal V s Outputting the output signal to the controllable precise voltage stabilizing source, wherein the other end of the controllable precise voltage stabilizing source is the second output end;
by comparison of V s And controlling the on-off of the controllable precise voltage stabilizing source according to the comparison result of the designated voltage value.
Further, the power supply voltage reducing module comprises a second capacitor, a second rectifying element, a third rectifying element, an electrolytic capacitor and a 12V voltage stabilizing diode;
and one end of the third rectifying element, the electrolytic capacitor and the 12V voltage stabilizing diode which are connected in parallel is electrically connected with ground.
Further, the on-off device is a normally closed relay.
Further, 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 electrode 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 connecting end of the second end of the fourth resistor are connected with the base electrode of the triode.
An input ac power overvoltage protection method, characterized in that the method for overvoltage protection by the input ac power overvoltage protection unit according to any one of the above claims comprises:
s100, generating 12V voltage, limiting and reducing the current of an input external power supply through a second capacitor (C1) in a power supply voltage reducing module (100), half-wave rectifying alternating current through a second rectifying element (D1), and reversely puncturing the voltage stabilizing tube when the voltage at two ends of the voltage stabilizing tube (Q1) is higher than 12V, so that the voltage of the voltage stabilizing tube (Q1) is clamped at 12V;
s200, detecting an external power supply voltage, detecting a power supply voltage value input from 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, stabilizing voltage through a first capacitor (C2), wherein the voltage value Vdc at two ends of the first capacitor (C2) is an alternating voltage V ac Peak value, voltage detection output signal is V s Measuring V dc 、V s 、V ac The relation between the two is:
obtaining a formula (1) through a formula (2) and a formula (3);
s230, when the reference voltage V is input s At > 2.5V, the cathode and anode are on; when the reference electrode voltage V is input s And when 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, wherein 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 input alternating current power supply overvoltage protection unit 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 the situation, voltage overvoltage is avoided, and damage to an electric appliance is prevented.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. 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 application.
Reference numerals illustrate:
100-power supply voltage reducing module, 200-voltage detecting module, 300-load protecting 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 stabilizing tube, Q2-triode, R2-third resistor, R3-fourth resistor, R4-first resistor, R5-second resistor, TL 431-controllable precise voltage stabilizing source, E-R4 and R5 connection point, f-second output end, g-first output end, connection point between h-R2 and R3.
Detailed Description
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other.
The description of "first," "second," "upper," "lower," etc. in this disclosure is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or the number of technical features indicated. Thus, a feature defining "first", "second", "upper", "lower" may include at least one such feature, either explicitly or implicitly. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to be based on the fact that those skilled in the art can implement the combination between the embodiments, and all the technical solutions are within the scope of protection claimed by the present application.
The application will be described in detail below with reference to the drawings in connection with embodiments.
As shown in fig. 1, an input ac power overvoltage protection unit is characterized by comprising:
the power supply voltage reducing 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 voltage is input through the first input end and is output through the first output end g to 12V;
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 voltage Vac is input through the second input end, and a comparison output voltage Vs is generated after the external power voltage Vac passes through the voltage detection module;
the load protection module 300 is electrically connected to the external power source and electrically connected 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 is electrically connected with the load;
and obtaining a judging result of whether the external power supply voltage Vac is overpressured or not according to a result of comparing the comparison output voltage Vs with the designated voltage value, and controlling the electric connection and disconnection actions of the on-off device.
The input external power voltage is stepped down to 12V by the power step-down module 100 to be input to the load protection module 300 for controlling the on-off of the on-off device 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 determined to be less than or equal to 12V, it indicates that the external power voltage is kept within the allowable threshold range of 22V mains supply, and keeps the on-off switch 310 closed. If the voltage is determined to be greater than 12V, which means that the external power supply voltage exceeds the allowable threshold range of 220V commercial power, the input voltage is considered to be over-voltage, the on-off device 310 is controlled to be turned off through the load protection module 300, and the power supply of the external power supply to the load is cut off. An input alternating current power supply overvoltage protection unit is adopted, a voltage detection and comparison circuit is arranged in the unit, whether the voltage exceeds a specified voltage or not is monitored and judged in real time, overvoltage protection operation is carried out according to the situation, voltage overvoltage is avoided, and damage to an electric appliance is prevented.
Specifically, the external power supply voltage V ac The peak voltage V is obtained after the voltage is stabilized by the first rectifying element D2 and the first capacitor C2 dc 。
The first rectifying element D2 is used for rectifying the alternating voltage V ac Half-wave rectification is performed, the first capacitor C2 is used for voltage stabilization, and the voltage value Vdc of the first capacitor C2 is the peak value of the alternating voltage Vac.
The first capacitor C2 is connected in parallel with the first resistor R4 and the 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 resistors s 。
V s And V ac The relation of (2) is:
wherein V is measured dc And V is equal to s And V ac The relationship between them is as shown in the following equations 2 and 3
Equation 1 is derived from equations 2 and 3.
Further, the method comprises the steps of,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 V s And the comparison result with the designated voltage value controls the on-off of the controllable precision voltage stabilizing source TL 431.
According to the characteristics of the controllable precision voltage-stabilizing source TL431, when the reference electrode voltage V is input s At > 2.5V, the cathode and anode are on; when the reference electrode voltage V is input s And when the voltage is less than or equal to 2.5V, the cathode and the anode are disconnected. As an example, R4 selects 5.1K and R5 selects 700K, calculated by equation 1, i.e., when V ac TL431 cathode and anode are conductive at > 244V; when V is ac And at 244V or less, the cathode and the anode of the TL431 are disconnected.
Specifically, the power supply voltage reducing module includes a second capacitor C1, a second rectifying element D1, a third rectifying element D3, an electrolytic capacitor E1, and a 12V zener diode Q1. Wherein, one end of the third rectifying element D3, the electrolytic capacitor E1 and the 12V zener diode are connected in parallel and electrically connected.
The second capacitor C1 is a thin film capacitor, and the equivalent impedance of the second capacitor C1 when the alternating voltage is applied across the second capacitor C1 is z=1/2 pi fC. In this embodiment, C1 takes 1uF, calculates C1 impedance z=1/2 pi, 50hz, 1 uf=3.185 kΩ, and when the voltage V between the zero and live wires is input ac At 220V, a maximum current i=220V/z=220V/3.185 k=69 mA is flowing through C1. Thus, the second capacitor C1 acts as a current limiter and a voltage reducer in the present circuit.
The second rectifying element D1 functions to half-wave rectify the ac power after the step-down. When the voltage at two ends of the voltage stabilizing tube Q1 is higher than 12V, the voltage stabilizing tube breaks down reversely, so that the voltage of the voltage stabilizing tube Q1 is clamped at 12V. Because the second capacitor C1 has the current limiting function, the reverse breakdown peak current of the voltage stabilizing tube Q1 is smaller than Vac/Z, and therefore the voltage stabilizing tube Q1 cannot be broken down due to overcurrent. The electrolytic capacitor E1 is used for stabilizing and filtering, so that 12V voltage is prevented from generating larger fluctuation, the size of the electrolytic capacitor E1 is selected according to actual requirements, and 470uF is selected. The third rectifying element D3 functions to provide a conductive loop in the negative half cycle of the ac voltage. The second rectifying elements D1, ZD2 may be conventional rectifying diodes such as 1N4007 or the like.
Preferably, the on-off device 310 is a normally closed relay.
The load protection module 300 further includes a transistor Q2 and third and fourth resistors R2 and R3 connected in series. The emitter of the transistor Q2 and the 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 on-off device 310. And the first end of the fourth resistor R3 is connected with the second output end f. And a connecting end h, which is connected with the second end of the third resistor R2 and the second end of the fourth resistor R3, is connected with the base electrode of the triode Q2.
The load on the zero live wire 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 to disconnect, and the load cannot be electrified, so that overvoltage protection is realized. Whether the normally closed relay operates 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 the voltage into the base electrode of the triode, and the voltage of the base electrode of the triode Q2 is lower than that of the emitter, so that the normally-closed relay is conducted, the electric shock is disconnected, and the load is not electrified, so that overvoltage protection is realized;
when the AC voltage is lower than the 244V protection voltage, 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 the attraction state, and the load is normally powered on.
An input ac power overvoltage protection method, which is performed by the input ac power overvoltage protection unit according to any one of the above, comprising:
s100, generating 12V voltage, limiting and reducing the current of an input external power supply through a second capacitor C1 in the power supply voltage reducing module 100, half-wave rectifying alternating current through a second rectifying element D1, and reversely puncturing the voltage stabilizing tube when the voltage at two ends of the voltage stabilizing tube Q1 is higher than 12V, so that the voltage of the voltage stabilizing tube Q1 is clamped at 12V;
s200, detecting an external power supply voltage, detecting a power supply voltage value input from outside through a voltage detection module, and judging whether the external power supply voltage exceeds a specified voltage value;
s210, half-wave rectification is carried out on alternating voltage Vac through a first rectifying element D2;
s220, stabilizing voltage through a first capacitor C2, wherein voltage values V at two ends of the first capacitor C2 dc Is of alternating voltage V ac Peak value, voltage detection output signal is V s Measuring V dc 、V s 、V ac The relation between the two is:
obtaining formula 1 through formula 2 and formula 3;
s230, when the reference voltage V is input s At > 2.5V, the cathode and anode are on; when the reference electrode voltage V is input s And when 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 ac power overvoltage protection unit is an input ac power overvoltage protection unit according to any one of the above.
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, wherein 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 a role in overvoltage protection 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 the situation, overvoltage of the voltage is avoided, and damage to an electric appliance is prevented.
In the preferred mode, the input alternating current power supply overvoltage protection unit can be arranged in the air conditioner as a circuit board, the input end of the input alternating current power supply overvoltage protection unit is connected with a power plug and the mains supply, and the other end of the input alternating current power supply overvoltage protection unit is connected with an input power supply terminal of the air conditioner, so that the on-off of the input power supply terminal is controlled through a relay.
The input AC power overvoltage protection unit can also be made into a single device, one end of the single device is connected with a power plug, the other end of the single device is made into a power jack mode, and a power line of the air conditioner is inserted into the power jack for use.
The input alternating current power supply overvoltage protection unit can also be applied to any electrical appliance.
As another embodiment, the input ac power overvoltage protection unit may also be provided in a wall outlet, a patch panel, or the like.
Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of the application following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the application pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.
It is to be understood that the application is not limited to the precise arrangements and instrumentalities shown in the drawings, which have been described above, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the application is limited only by the appended claims.
Claims (6)
1. An input ac power overvoltage protection unit, comprising:
the power supply voltage reducing 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 voltage is input through the first input end and is output through the first output end (g) to 12V;
a voltage detection module (200) comprising a second input and a second output (f), the second input being electrically connected to the external power source;
an external power supply voltage V is input through the second input end ac After passing through the voltage detection module, a voltage detection output signal V is generated s ；
A load protection module (300) electrically connected to the external power source and electrically connected to the first output terminal (g) and the second output terminal (f); the load protection module (300) is provided with a power output end, and is connected with a load through the power output end;
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 is electrically connected with the load;
the load protection module further comprises a triode (Q2) and a third resistor (R2) and a fourth resistor (R3) which are connected in series, wherein an emitter of the triode (Q2) and a first end of the third resistor (R2) are connected to the first output end (g);
the collector of the triode (Q2) is electrically connected with the on-off device (310);
-a connection of a first end of the fourth resistor (R3) to the second output (f);
a connecting end (h) connected with the second end of the third resistor (R2) and the second end of the fourth resistor (R3) is connected with the base electrode of the triode (Q2);
by detecting the output signal V s Comparing the result with the appointed voltage value to obtain the external power supply voltage V ac Whether the over-voltage is judged, and controlling the electric connection and the cutting-off action of the on-off device;
wherein the external power supply voltage V ac The peak voltage V is obtained after voltage stabilization by the first capacitor C2 through the first rectifying element (D2) dc ；
The first capacitor C2 is connected in parallel with the first resistor R4 and the second resistor R5 which are connected in series, and a voltage detection output signal V is obtained at a connection point e between the first resistor R4 and the second resistor R5 s ；
V s And V ac The relation of (2) is:
the voltage detection module further comprises a controllable precision voltage stabilizing source (TL 431) which is controlled by comparing V s Controlling the on-off of the controllable precision voltage stabilizing source (TL 431) according to the comparison result of the designated voltage value;
the power supply voltage reducing module comprises a second capacitor (C1), a second rectifying element (D1), a third rectifying element (D3), an electrolytic capacitor (E1) and a voltage stabilizing tube (Q1);
one end of the third rectifying element (D3), the electrolytic capacitor (E1) and the voltage stabilizing tube are connected in parallel and are electrically connected with one another, alternating-current voltage is applied to two ends of the second capacitor (C1), and the second rectifying element (D1) is used for half-wave rectification of the alternating current subjected to voltage reduction; when the voltage at two ends of the voltage stabilizing tube (Q1) is higher than 12V, the voltage of the voltage stabilizing tube (Q1) is clamped at 12V, the voltage stabilizing tube breaks down reversely, the electrolytic capacitor (E1) acts as voltage stabilizing and filtering to prevent the voltage of 12V from generating larger fluctuation, and the third rectifying element (D3) acts to provide a conducting loop in the negative half cycle of the alternating voltage.
2. The input ac power overvoltage protection unit according to claim 1, wherein,
the voltage detection output signal V s And the output is to the controllable precise voltage stabilizing source (TL 431), and the other end of the controllable precise voltage stabilizing source (TL 431) is the second output end (f).
3. The input ac power overvoltage protection unit according to claim 1, wherein,
the on-off device (310) is a normally closed relay.
4. A method of overvoltage protection of an input ac power supply by an input ac power supply overvoltage protection unit according to any one of claims 1 to 3, comprising:
s100, generating 12V voltage, limiting and reducing the current of an input external power supply through a second capacitor (C1) in a power supply voltage reducing module (100), half-wave rectifying alternating current through a second rectifying element (D1), and reversely puncturing the voltage stabilizing tube when the voltage at two ends of the voltage stabilizing tube (Q1) is higher than 12V, so that the voltage of the voltage stabilizing tube (Q1) is clamped at 12V;
s200, detecting the external power supply voltage V ac Detecting an externally input power supply voltage value through a voltage detection module, and judging whether the external power supply voltage exceeds a specified voltage value or not;
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.
5. The method of overvoltage protection for an input ac power source of claim 4,
in step S200, it includes:
s210, half-wave rectification is carried out on the alternating voltage Vac through a first rectifying element (D2);
s220, stabilizing voltage through a first capacitor C2, wherein the voltage value Vdc at two ends of the first capacitor C2 is an alternating voltage V ac Peak value, voltage detection output signal is V s Measuring V dc 、V s 、V ac The relation between the two is:
obtaining a formula (1) through a formula (2) and a formula (3);
s230, when the reference voltage V of the voltage stabilizing tube is input s At > 2.5V, the cathode and anode are on; when the reference voltage V of the voltage stabilizing tube is input s And when the voltage is less than or equal to 2.5V, the cathode and the anode are disconnected.
6. An air conditioner, comprising:
an input ac power overvoltage protection unit according to any one of claims 1 to 3;
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, wherein 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 | AC overvoltage protection circuit with self-locking 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 | AC overvoltage protection circuit with self-locking 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 |
|---|---|
| CN113937738A (en) | 2022-01-14 |
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Effective date of registration: 20230414 Address after: 315191 No. 1166 Mingguang North Road, Jiangshan Town, Ningbo, Zhejiang, Yinzhou District Applicant after: NINGBO AUX ELECTRIC Co.,Ltd. Address before: 519000 202, floor 2, building B, high tech Zone headquarters base, No. 2 Qianwan Second Road, Tangjiawan Town, high tech Zone, Zhuhai, Guangdong Applicant before: ZHUHAI TUOXIN TECHNOLOGY Co.,Ltd. Applicant before: NINGBO AUX ELECTRIC Co.,Ltd. |
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