CN204794060U - Surge current protection circuit and air conditioner supply circuit - Google Patents
Surge current protection circuit and air conditioner supply circuit Download PDFInfo
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- CN204794060U CN204794060U CN201520442723.7U CN201520442723U CN204794060U CN 204794060 U CN204794060 U CN 204794060U CN 201520442723 U CN201520442723 U CN 201520442723U CN 204794060 U CN204794060 U CN 204794060U
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- protection circuit
- switching device
- air conditioner
- surge current
- current protection
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Abstract
The utility model discloses a surge current protection circuit and air conditioner supply circuit, wherein surge current protection circuit includes current -limiting resistor, first switching element and second switch device, just surge current protection circuit has power input end and power output end, the first end of first switching element with the power input end is connected, the second of first switching element end with power output holds the connection, current -limiting resistor with the second switch device is established ties, and the current circuit who constitutes and first switching element is parallelly connected. The utility model discloses a second switch device in the surge current protection circuit is only worked when the start, can adopt the relay or the silicon controlled rectifier of undercurrent, therefore the cost of circuit is lower, and the life -span of device is longer, the reliability is better. And simultaneously, the utility model provides an use the air conditioner supply circuit of above -mentioned surge current protection circuit, possess similar technological effect.
Description
Technical field
The utility model relates to household electrical appliance technical field, is specifically related to a kind of surge current protection circuit and air conditioner power supply circuits.
Background technology
Surge current refers to that power supply connects moment, flows into the peak current of power-supply device.Because input filter capacitor charges rapidly, so this peak current is far longer than stable state input current, it probably makes circuit burning out in a flash at surge, and as capacitance of PN junction punctures, resistance blows etc.
Existing transducer air conditioning because its refrigerating/heating is effective and have energy-conservation feature, and is widely used in family and business scope.
Due to the Structure and Properties feature of transducer air conditioning own control systems, initially can cause higher surge current powering on, in addition the alternating voltage of some areas or time period is also unstable in addition, therefore requires to be designed with in air conditioner control system the protecting component suppressing power supply initial current overload.
For the electrochemical capacitor in circuit, (capacitance is generally not less than 470uF to prior art, for the convertible frequency air-conditioner of 1.5, capacitance is more than 1000uF) charging current peak value, be in series with current-limiting resistance and the first relay for control circuit break-make in circuit, described current-limiting resistance is also parallel with the second relay for controlling described current-limiting resistance short circuit.
The shortcoming existing for air conditioner power supply circuits of prior art is:
1, circuit reliability is poor, and the first relay and the second relay two relays are all long-term opening states when normal work, and long-term work, affects the life-span;
2, cost is high, and during energising work, the first relay and the second relay two relays are all the big current flowing through normal work, need two relays of big current.
Utility model content
The purpose of this utility model is, provides a kind of surge current protection circuit and power supply circuits, can prevent from damaging circuit at the initial caused surge current that powers on, and possess higher reliability, cost is low simultaneously.
For solving above technical problem, the utility model embodiment provides a kind of surge current protection circuit, comprises current-limiting resistance, the first switching device and second switch device, and described surge current protection circuit has power input and power output end; The first end of described first switching device is connected with described power input, and the second end of described first switching device is connected with described power output end; Described current-limiting resistance and described second switch devices in series, and the series circuit formed is in parallel with described first switching device.
Preferably, described first switching device is relay or controllable silicon.
Preferably, described second switch device is relay or controllable silicon.
Preferably, described current-limiting resistance is PTC (PositiveTemperatureCoefficient, positive temperature coefficient) thermistor or NTC (NegativeTemperatureCoefficient, negative temperature coefficient) thermistor or cement resistor.
Simultaneously, in order to reach identical object, the utility model embodiment also provides a kind of air conditioner power supply circuits, comprises rectifier bridge, electrochemical capacitor, current-limiting resistance, the first switching device and second switch device, and has interchange N line input, interchange L line input and DC output end;
Described interchange N line input is connected to the first ac input end of described rectifier bridge; Described interchange L line input is connected to the second ac input end of described rectifier bridge by described first switching device; Described current-limiting resistance and described second switch devices in series, and the series circuit formed is in parallel with described first switching device; First DC output end of described rectifier bridge is connected to the positive pole of described electrochemical capacitor, and is connected with the DC output end of described air conditioner power supply circuits; Second DC output end of described rectifier bridge is connected to the negative pole of described electrochemical capacitor and ground connection.
Preferably, described first switching device is relay or controllable silicon.
Preferably, described second switch device is relay or controllable silicon.
Preferably, described current-limiting resistance is PTC (PositiveTemperatureCoefficient, positive temperature coefficient) thermistor or NTC (NegativeTemperatureCoefficient, negative temperature coefficient) thermistor or cement resistor.
Compared to prior art, the beneficial effect of a kind of surge current protection circuit of the present utility model is: the structure of the utility model to the protection circuit of prior art is improved, in circuit structure wherein after improvement, the initial caused surge current that powers on is limited in by the resistance of current-limiting resistance, can protective circuit effectively; The only work when starting shooting of second switch device, can adopt relay or the controllable silicon of small area analysis, thus the cost of circuit is lower, and the life-span of device is longer, better reliability.Meanwhile, the utility model also provides a kind of air conditioner power supply circuits, comprises above-mentioned starting protection circuit, can possess similar technique effect.
Accompanying drawing explanation
Fig. 1 is the structural representation of this kind of surge current protection circuit of the present utility model;
Fig. 2 is the structural representation of a kind of air conditioner power supply circuits of the present utility model.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
Refer to Fig. 1, it is the structural representation of a kind of surge current protection circuit of the present utility model.Described surge current protection circuit, comprises current-limiting resistance R1, the first switching device and second switch device, and described surge current protection circuit has power input and power output end; The first end of described first switching device is connected with described power input, and the second end of described first switching device is connected with described power output end; Described current-limiting resistance and described second switch devices in series, and the series circuit formed is in parallel with described first switching device.
Preferably, described first switching device is relay or controllable silicon.In the present embodiment, described first switching device adopts relay, as the RL1 in Fig. 1.
Preferably, described second switch device is relay or controllable silicon.In the present embodiment, described second switch device adopts relay, as the RL2 in Fig. 1.
Preferably, described current-limiting resistance R1 is PTC (PositiveTemperatureCoefficient, positive temperature coefficient) thermistor or NTC (NegativeTemperatureCoefficient, negative temperature coefficient) thermistor or cement resistor.
Described surge current protection circuit is when just switching on power, and the first switching device disconnects, and second switch device closes, and thus can carry out limit inrush currents by the resistance of current-limiting resistance; After circuit stability, the first switching device closes, and second switch device disconnects.Due to the only work when starting shooting of second switch device, can adopt relay or the controllable silicon of small area analysis, thus the cost of circuit is lower, and the life-span of device is longer, better reliability.
Above-mentioned surge current protection circuit can be applied in air conditioner power supply circuits, thus in embodiment of the present utility model, additionally provides a kind of air conditioner power supply circuits.
Refer to Fig. 2, it is the structural representation of a kind of air conditioner power supply circuits of the present utility model.The air conditioner power supply circuits that the utility model provides comprise rectifier bridge BD1, electrochemical capacitor C1, current-limiting resistance R1, the first switching device and second switch device, and have interchange N line input, interchange L line input and DC output end; Wherein, described interchange N line input is for being connected to the interchange N line of civil power; Described interchange L line input is for being connected to the interchange L line of civil power; Described DC output end is used for being connected to successive load, for described successive load provides DC power supply.
Described interchange N line input is connected to first ac input end of described rectifier bridge BD1; Described interchange L line input is connected to second ac input end of described rectifier bridge BD1 by described first switching device; Described current-limiting resistance R1 and described second switch devices in series, and the series circuit formed is in parallel with described first switching device; First DC output end of described rectifier bridge BD1 is connected to the positive pole of described electrochemical capacitor C1, and is connected with the DC output end of described air conditioner power supply circuits; Second DC output end of described rectifier bridge BD1 is connected to the negative pole of described electrochemical capacitor C1 and ground connection.
Preferably, described first switching device is relay or controllable silicon.In the present embodiment, described first switching device adopts relay, as the RL1 in Fig. 2.
Preferably, described second switch device is relay or controllable silicon.In the present embodiment, described second switch device adopts relay, as the RL2 in Fig. 2.
Preferably, described current-limiting resistance R1 is PTC (PositiveTemperatureCoefficient, positive temperature coefficient) thermistor or NTC (NegativeTemperatureCoefficient, negative temperature coefficient) thermistor or cement resistor.
The operation principle of air conditioner power supply circuits of the present utility model is as follows: when air conditioner is started shooting, described first switching device disconnects, described second switch device closes, L/N alternating current is that described electrochemical capacitor C1 charges through described current-limiting resistance R1 and described second switch device, described rectifier bridge BD1, resistance by described current-limiting resistance R1 is come to described electrochemical capacitor C1 current limliting, thus surge current when limiting starting up; After described electrochemical capacitor C1 is full of electricity, described first switching device closes, and described second switch device disconnects, L N alternating current be input to described rectifier bridge BD1 through described first relay, and to be converted to direct current be successive load circuit supply.
Compared to prior art, the beneficial effect of a kind of surge current protection circuit of the present utility model is: the structure of the utility model to the protection circuit of prior art is improved, in circuit structure wherein after improvement, the initial caused surge current that powers on is limited in by the resistance of current-limiting resistance, can protective circuit effectively; The only work when starting shooting of second switch device, can adopt relay or the controllable silicon of small area analysis, thus the cost of circuit is lower, and the life-span of device is longer, better reliability.Meanwhile, the utility model also provides a kind of air conditioner power supply circuits, comprises above-mentioned starting protection circuit, can possess similar technique effect.
The above is preferred implementation of the present utility model; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the utility model principle; can also make some improvements and modifications, these improvements and modifications are also considered as protection range of the present utility model.
Claims (8)
1. a surge current protection circuit, is characterized in that, comprises current-limiting resistance, the first switching device and second switch device, and described surge current protection circuit has power input and power output end; The first end of described first switching device is connected with described power input, and the second end of described first switching device is connected with described power output end; Described current-limiting resistance and described second switch devices in series, and the series circuit formed is in parallel with described first switching device.
2. surge current protection circuit as claimed in claim 1, it is characterized in that, described first switching device is relay or controllable silicon.
3. surge current protection circuit as claimed in claim 1, it is characterized in that, described second switch device is relay or controllable silicon.
4. as claimed in claim 2 or claim 3 surge current protection circuit, is characterized in that, described current-limiting resistance is PTC thermistor or NTC thermistor or cement resistor.
5. air conditioner power supply circuits, is characterized in that, comprise rectifier bridge, electrochemical capacitor, current-limiting resistance, the first switching device and second switch device, and have interchange N line input, interchange L line input and DC output end;
Described interchange N line input is connected to the first ac input end of described rectifier bridge; Described interchange L line input is connected to the second ac input end of described rectifier bridge by described first switching device; Described current-limiting resistance and described second switch devices in series, and the series circuit formed is in parallel with described first switching device; First DC output end of described rectifier bridge is connected to the positive pole of described electrochemical capacitor, and is connected with the DC output end of described air conditioner power supply circuits; Second DC output end of described rectifier bridge is connected to the negative pole of described electrochemical capacitor and ground connection.
6. air conditioner power supply circuits as claimed in claim 5, it is characterized in that, described first switching device is relay or controllable silicon.
7. air conditioner power supply circuits as claimed in claim 5, it is characterized in that, described second switch device is relay or controllable silicon.
8. air conditioner power supply circuits as claimed in claims 6 or 7, is characterized in that, described current-limiting resistance is PTC thermistor or NTC thermistor or cement resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520442723.7U CN204794060U (en) | 2015-06-24 | 2015-06-24 | Surge current protection circuit and air conditioner supply circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520442723.7U CN204794060U (en) | 2015-06-24 | 2015-06-24 | Surge current protection circuit and air conditioner supply circuit |
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| CN204794060U true CN204794060U (en) | 2015-11-18 |
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| CN201520442723.7U Active CN204794060U (en) | 2015-06-24 | 2015-06-24 | Surge current protection circuit and air conditioner supply circuit |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107143964A (en) * | 2016-03-01 | 2017-09-08 | 珠海格力电器股份有限公司 | Start-up circuit and air conditioner for starting air-conditioning |
| CN107317315A (en) * | 2017-08-18 | 2017-11-03 | 安图实验仪器(郑州)有限公司 | Surge current suppression circuit module |
| CN108539836A (en) * | 2018-05-31 | 2018-09-14 | 奥克斯空调股份有限公司 | Include the charging circuit and air conditioner of anti-short-circuit protection circuit |
| CN108539722A (en) * | 2018-04-27 | 2018-09-14 | 北京航天自动控制研究所 | One kind is avoided for electrically connecting moment charger transient fault circuit and method |
| CN109524950A (en) * | 2018-12-28 | 2019-03-26 | 广东美的厨房电器制造有限公司 | Filter circuit, timer and cooking apparatus |
-
2015
- 2015-06-24 CN CN201520442723.7U patent/CN204794060U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107143964A (en) * | 2016-03-01 | 2017-09-08 | 珠海格力电器股份有限公司 | Start-up circuit and air conditioner for starting air-conditioning |
| CN107317315A (en) * | 2017-08-18 | 2017-11-03 | 安图实验仪器(郑州)有限公司 | Surge current suppression circuit module |
| CN108539722A (en) * | 2018-04-27 | 2018-09-14 | 北京航天自动控制研究所 | One kind is avoided for electrically connecting moment charger transient fault circuit and method |
| CN108539836A (en) * | 2018-05-31 | 2018-09-14 | 奥克斯空调股份有限公司 | Include the charging circuit and air conditioner of anti-short-circuit protection circuit |
| CN108539836B (en) * | 2018-05-31 | 2024-03-22 | 奥克斯空调股份有限公司 | Charging circuit comprising short-circuit protection circuit and air conditioner |
| CN109524950A (en) * | 2018-12-28 | 2019-03-26 | 广东美的厨房电器制造有限公司 | Filter circuit, timer and cooking apparatus |
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