CN201315484Y - Surge voltage suppressing circuit and air conditioner comprising same - Google Patents
Surge voltage suppressing circuit and air conditioner comprising same Download PDFInfo
- Publication number
- CN201315484Y CN201315484Y CNU2008202242151U CN200820224215U CN201315484Y CN 201315484 Y CN201315484 Y CN 201315484Y CN U2008202242151 U CNU2008202242151 U CN U2008202242151U CN 200820224215 U CN200820224215 U CN 200820224215U CN 201315484 Y CN201315484 Y CN 201315484Y
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- air conditioner
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- surge voltage
- silicon bridge
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Abstract
The utility model discloses a surge voltage suppressing circuit and an air conditioner comprising the circuit. The surge voltage suppressing circuit comprises an AC power supply input end and a rectification silicon bridge, wherein, an AC input end of the rectification silicon bridge is in parallel connection with a voltage dependent resistor or a capacitor. The surge voltage suppressing circuit has the advantages of simple structure and remarkable effect, and can effectively protect the weak link in a main power supply loop, thereby improving the reliability of the circuit. When the surge voltage suppressing circuit is applied in the air conditioner, the surge impulse endurance capacity of the air conditioner can be increased to third level (2000V between L and N), and a PFC (passive frequency conversion) air conditioner can be further improved in the aspect of standards conforming, thereby improving the competitiveness of air conditioning products and extending the using range of air conditioners.
Description
Technical field
The utility model belongs to the power circuit technical field, specifically, relates to a kind of treatment circuit that the surge impact voltage that seals in the power circuit is effectively suppressed and has the air conditioner that described surge voltage suppresses circuit.
Background technology
Because the harmonic problem of electric network source is more and more paid attention to by people, so the power factor correction pfc circuit also is used in the various power circuits more and more.
At present, the PFC scheme that power factor correction is adopted in transducer air conditioning can be divided into active, passive two big classes.For the split type wall hanging air conditioner of the less relatively family expenses of input power, the overwhelming majority adopts passive PFC scheme to carry out the correction of power factor.The major advantage of passive PFC mode is: cost is relatively low, and reliability is higher.The main mode of its realization is at the AC side of the full-bridge rectification major loop of air-conditioner outdoor unit and the DC side inductance coil of respectively connecting, and to improve the quality factor of main circuit power supply, reaches the purpose that improves power factor.
But; the problem of bringing thus is to adopt the air conditioner of passive PFC mode at present when carrying out the surge impact test; because the effect of inductance coil causes breakdown, the inefficacy of rectification silicon bridge through regular meeting; therefore; the tolerance level of power circuit is lower; only can reach 2 grades of levels (1000V between L-N) that GB requires, make passive PFC scheme transducer air conditioning relatively poor aspect meeting, thereby cause the application region limited in standard.
The utility model content
The utility model provides a kind of surge voltage to suppress circuit in order to solve the existing low problem of power circuit tolerance surge impact level that adopts passive PFC mode to design, and has effectively protected the weak link in the power supply major loop.
For solving the problems of the technologies described above, the utility model is achieved by the following technical solutions:
A kind of surge voltage suppresses circuit, comprises ac power input end and rectification silicon bridge, is parallel with piezo-resistance or electric capacity at the ac input end of described rectification silicon bridge.
Further, be in series with an inductance respectively, to realize correction to the main circuit power supply power factor at the ac input end and the dc output end of described rectification silicon bridge.
The single-phase full bridge rectification circuit further again, that described rectification silicon bridge is made up of four diodes.
Further again, when being struck by lightning, the high pressure thunder and lightning causes damage to late-class circuit for fear of ac power input end, is parallel with another piezo-resistance at described ac power input end, to realize the protection to late-class circuit.
Further, one of them terminal of described ac power input end is through discharge tube and a piezo-resistance ground connection, to prevent that sealing in thunderstorm hour between ac power input end and the ground causes damage to late-class circuit.
Suppress circuit structure based on above-mentioned surge voltage, the utility model provides a kind of air conditioner that described surge voltage suppresses circuit that has again, by described inhibition circuit is set in the main circuit power supply of air conditioner internal circuit board, the i.e. ac input end of rectification silicon bridge piezo-resistance in parallel or electric capacity in power circuit, thus surge impact problem in the passive PFC scheme of transducer air conditioning solved.
Compared with prior art, advantage of the present utility model and good effect are: surge voltage inhibition circuit structure of the present utility model is simple, and effect is remarkable, can effectively protect the weak link in the main circuit power supply, and then reaches the purpose that improves circuit reliability.Described surge voltage is suppressed circuit application in air conditioner, the surge impact tolerance of air conditioner can be brought up to 3 grades of levels (2000V between L-N), make passive PFC scheme transducer air conditioning be further enhanced aspect meeting in standard, thereby increased the air-conditioning competitiveness of product in market, and the scope of application of air conditioner is expanded.
After reading the detailed description of the utility model execution mode in conjunction with the accompanying drawings, other characteristics of the present utility model and advantage will become clearer.
Description of drawings
Fig. 1 is the circuit theory diagrams that the surge voltage that proposes of the utility model suppresses a kind of embodiment of circuit.
Embodiment
Below in conjunction with accompanying drawing embodiment of the present utility model is described in detail.
Surge voltage of the present utility model suppresses circuit by the AC side of the rectification silicon bridge in power supply major loop piezo-resistance in parallel or capacitor element, realized inhibitory action with simple circuit configuration to surge voltage, thereby significantly improved the anti-surge impact ability of the power circuit that adopts passive PFC conceptual design, made that the power circuit reliability of operation is strengthened.
Be example with the air conditioner that adopts passive PFC mode below, elaborate the concrete composition structure and the course of work that described surge voltage suppresses circuit.
Embodiment one, and referring to shown in Figure 1, present embodiment is that example is specifically set forth the syndeton that described surge voltage suppresses circuit with a kind of typical electrical source circuit in the passive PFC scheme transducer air conditioning.
Among Fig. 1, CN01, CN02 are ac power input end, the power supply of reception external communication, connect fuse F01 by common mode inductance L01, connect inductance L 02 through soft starting circuit, and then the AC side of connection rectification silicon bridge, promptly ac input end is converted to direct current by its DC side output by rectification silicon bridge with the alternating current of importing.The DC side of described rectification silicon bridge, promptly dc output end connects back level load by inductance L 03, for back level load provides dc supply.
In the present embodiment, described rectification silicon bridge can adopt the single-phase full bridge rectification circuit of being made up of four diode D01～D04 to realize, to finish the full-wave rectification task.Direct voltage by rectification silicon bridge output is applied to back level load (in the present embodiment, the level load of described back can specifically refer to compressor of air conditioner) through the electric capacity E01 and the capacitor C 05 of parallel connection, to realize that a grade load provides stable direct current supply backward.Wherein, described electric capacity E01 plays flat ripple effect to the direct voltage of rectification silicon bridge output, makes the voltage waveform of output more level and smooth; Capacitor C 05 is a filter capacitor, can play the make an uproar effect of wave interference of effective inhibition high frequency.
In the present embodiment, described soft starting circuit can be composed in parallel by the normally opened contact of thermistor PTC01 and main relay RY01.When the air conditioner energising starts, the external communication power supply of introducing by ac power input end CN01, CN02 through common mode inductance L01 and the capacitor C 3, the C04 that are connected in parallel on its rear and front end respectively carry out that common mode disturbances suppresses and Filtering Processing after, be input to rectification silicon bridge by thermistor PTC01, inductance L 02, and then be converted into direct current supply, the level load drives its operation that powers on after inductance L 03, electric capacity E01, C05 are applied to.Because during air conditioner start operation, starting current is very big, design thermal resistance PTC01 can effectively reduce starting current, reaches the purpose of protection air conditioner internal circuit board.After air conditioner started a period of time, control main relay RY01 adhesive, and then bypass thermistor PTC01 made complete machine enter normal operating condition.
In the circuit, inductance L 02, L03 constitute passive PFC power factor correction scheme, when improving the power circuit quality factor, the antisurge impact capacity of power circuit are reduced, and usually can cause the puncture of rectification silicon bridge.For head it off, present embodiment is at the ac input end of rectification silicon bridge piezo-resistance Z03 in parallel, playing the effective inhibitory action to surge voltage, and then realizes the protection to rectification silicon bridge.
Operation principle to this circuit is described in detail below.
Before piezo-resistance Z03 not in parallel, when ac power input end CN01, the CN02 of this power circuit were connected the 220V AC power and carry out full angle between Live line Zero line+1000V surge impact laboratory, rectification silicon bridge was often breakdown.Concrete reason is analyzed as follows:
When exchanging input string ripple at 270 °, the sense of current that flows through rectification silicon bridge internal power diode D01 is b → a, and at this moment, the voltage at inductance L 02 two ends is: a end is negative potential for positive potential, c end.When+1000V surge impact voltage is next interim, and the c terminal potential of inductance L 02 raises rapidly, and b → a potential difference reduces rapidly simultaneously, and oppositely final, promptly current direction transfers a → b to.At this moment, because the junction capacitance characteristic of rectification silicon bridge internal power diode D01 has determined a → b can produce a big recoil electric current, and described recoil electric current has a little → big → little spike process.When after the recoil electric current reaches peak value, beginning to reduce, because the existence of inductance L 02 can stop reducing of this recoil electric current.At this moment, a terminal potential raises, and can produce a Kickback voltage to power diode D01, thereby cause power diode D01 thermal breakdown.
Present embodiment is at the problems referred to above; ac input end at rectification silicon bridge; be between a, the d; piezo-resistance Z03 in parallel is when Kickback voltage comes temporarily piezo-resistance Z03 conducting; at this moment; provide a low-impedance path to shunt the part that the recoil electric current is diminished by peak value by piezo-resistance Z03, thereby reduced to be applied to the gross energy of the recoil electric current on the power diode D01, played weak link in the passive pfc circuit of effective protection---the effect of rectification silicon bridge.
Actual tests proves: after adopting this measure, the antisurge impact capacity of new designing power supply circuit does not have the primary circuit of piezo-resistance Z03 to compare to have improved 1000V, thereby can be so that the anti-surge impact ability of transducer air conditioning is brought up to 3 grade standards for 2 grades by GB.
As another one embodiment, described piezo-resistance Z03 also can adopt a capacitor element to replace, and is connected in parallel on the ac input end of rectification silicon bridge, promptly between a, the d, plays the shunting action to the recoil electric current, and is not shown.The appearance value of described capacitor may be selected in about 1 microfarad, can realize the effective inhibition to surge voltage equally.
In addition, damage, between described ac power input end CN01, CN02, also be parallel with a piezo-resistance Z02 for fear of air conditioner overvoltage when being struck by lightning.Seal in thunderstorm hour between live wire and zero line, piezo-resistance Z02 short circuit to cut off late-class circuit, realizes the overvoltage protection to air conditioner.
In order to realize further protection, in the present embodiment, the live wire end CN01 of AC power is connected earth terminal EARTH through the discharge tube SA101 of series connection with piezo-resistance Z01 to air conditioner.When sealing in thunderstorm hour between live wire and the ground or between zero line and the ground, discharge tube SA101 closure, electric current flows to the earth by discharge tube SA101 and piezo-resistance Z01, thereby realizes the effective protection to the air conditioner late-class circuit.After thunder and lightning disappeared, piezo-resistance Z01 control discharge tube SA101 turn-offed, thereby makes late-class circuit reenter normal operating conditions.
The utility model is by analyzing the parameters of power circuit when bearing surge impact; design a kind of novel surge voltage and suppressed circuit; effectively protected the weak link in the main circuit power supply; thereby transducer air conditioning surge impact tolerance is brought up to 3 grades of levels (2000V between L-N); make passive PFC scheme transducer air conditioning obtain further raising aspect meeting in standard; increase the competitiveness of product in market, and further expanded the scope of application of air conditioner.
Certainly; the above only is a kind of preferred implementation of the present utility model; should be understood that; for those skilled in the art; under the prerequisite that does not break away from the utility model principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection range of the present utility model.
Claims (10)
1, a kind of surge voltage suppresses circuit, comprises ac power input end and rectification silicon bridge, and it is characterized in that: the ac input end at described rectification silicon bridge is parallel with piezo-resistance or electric capacity.
2, surge voltage according to claim 1 suppresses circuit, and it is characterized in that: ac input end and dc output end at described rectification silicon bridge are in series with an inductance respectively.
3, surge voltage according to claim 1 and 2 suppresses circuit, it is characterized in that: the single-phase full bridge rectification circuit that described rectification silicon bridge is made up of four diodes.
4, surge voltage according to claim 1 and 2 suppresses circuit, it is characterized in that: be parallel with another piezo-resistance at described ac power input end.
5, surge voltage according to claim 4 suppresses circuit, and it is characterized in that: one of them terminal of described ac power input end is through discharge tube and a piezo-resistance ground connection.
6, a kind of air conditioner, the internal circuit board of described air conditioner is provided with power circuit, comprises ac power input end and rectification silicon bridge, it is characterized in that: the ac input end at described rectification silicon bridge is parallel with piezo-resistance or electric capacity.
7, air conditioner according to claim 6 is characterized in that: ac input end and dc output end at described rectification silicon bridge are in series with an inductance respectively.
8, according to claim 6 or 7 described air conditioners, it is characterized in that: the single-phase full bridge rectification circuit that described rectification silicon bridge is made up of four diodes.
9, according to claim 6 or 7 described air conditioners, it is characterized in that: be parallel with another piezo-resistance at described ac power input end.
10, air conditioner according to claim 9 is characterized in that: one of them terminal of described ac power input end is through discharge tube and a piezo-resistance ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008202242151U CN201315484Y (en) | 2008-11-25 | 2008-11-25 | Surge voltage suppressing circuit and air conditioner comprising same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008202242151U CN201315484Y (en) | 2008-11-25 | 2008-11-25 | Surge voltage suppressing circuit and air conditioner comprising same |
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| CN201315484Y true CN201315484Y (en) | 2009-09-23 |
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| CNU2008202242151U Expired - Fee Related CN201315484Y (en) | 2008-11-25 | 2008-11-25 | Surge voltage suppressing circuit and air conditioner comprising same |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102519114A (en) * | 2011-12-13 | 2012-06-27 | Tcl空调器(中山)有限公司 | Surge-resisting inverter air conditioner |
| CN104134983A (en) * | 2014-07-02 | 2014-11-05 | 邯郸美的制冷设备有限公司 | Overvoltage protection device and overvoltage protection method for air conditioner and air conditioner |
| CN104134982A (en) * | 2014-07-02 | 2014-11-05 | 邯郸美的制冷设备有限公司 | Overvoltage protection device for air conditioner, overvoltage protection method and air conditioner |
| CN105353851A (en) * | 2015-11-23 | 2016-02-24 | 浪潮电子信息产业股份有限公司 | Fan board and connection system of fan board |
| CN107591783A (en) * | 2017-08-28 | 2018-01-16 | 广东美的暖通设备有限公司 | A kind of control method of three phase mains protection circuit and three phase mains protection circuit |
| CN109713767A (en) * | 2017-10-20 | 2019-05-03 | 奥克斯空调股份有限公司 | A kind of charging circuit and convertible frequency air-conditioner with overvoltage crowbar |
| CN110417250A (en) * | 2019-08-05 | 2019-11-05 | 深圳市搏世通用科技开发有限公司 | A kind of adaptive power supply soft-start control system |
| CN111550912A (en) * | 2020-04-09 | 2020-08-18 | 海信（山东）空调有限公司 | Air conditioner filter circuit, air conditioner controller and air conditioner |
| CN111641334A (en) * | 2020-06-05 | 2020-09-08 | 广东美的制冷设备有限公司 | Variable frequency control device and air conditioner |
| WO2022267220A1 (en) * | 2021-06-22 | 2022-12-29 | 中山大洋电机股份有限公司 | Power supply circuit for motor controller, and motor controller |
-
2008
- 2008-11-25 CN CNU2008202242151U patent/CN201315484Y/en not_active Expired - Fee Related
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102519114A (en) * | 2011-12-13 | 2012-06-27 | Tcl空调器(中山)有限公司 | Surge-resisting inverter air conditioner |
| CN104134982B (en) * | 2014-07-02 | 2017-06-06 | 邯郸美的制冷设备有限公司 | Overvoltage protection, over-voltage protection method and air-conditioner for air-conditioner |
| CN104134982A (en) * | 2014-07-02 | 2014-11-05 | 邯郸美的制冷设备有限公司 | Overvoltage protection device for air conditioner, overvoltage protection method and air conditioner |
| WO2016000327A1 (en) * | 2014-07-02 | 2016-01-07 | 美的集团股份有限公司 | Overvoltage protection apparatus for air conditioner, overvoltage protection method, and air conditioner |
| CN104134983B (en) * | 2014-07-02 | 2017-05-31 | 邯郸美的制冷设备有限公司 | Overvoltage protection, over-voltage protection method and air-conditioner for air-conditioner |
| CN104134983A (en) * | 2014-07-02 | 2014-11-05 | 邯郸美的制冷设备有限公司 | Overvoltage protection device and overvoltage protection method for air conditioner and air conditioner |
| CN105353851A (en) * | 2015-11-23 | 2016-02-24 | 浪潮电子信息产业股份有限公司 | Fan board and connection system of fan board |
| CN107591783A (en) * | 2017-08-28 | 2018-01-16 | 广东美的暖通设备有限公司 | A kind of control method of three phase mains protection circuit and three phase mains protection circuit |
| CN109713767A (en) * | 2017-10-20 | 2019-05-03 | 奥克斯空调股份有限公司 | A kind of charging circuit and convertible frequency air-conditioner with overvoltage crowbar |
| CN110417250A (en) * | 2019-08-05 | 2019-11-05 | 深圳市搏世通用科技开发有限公司 | A kind of adaptive power supply soft-start control system |
| CN111550912A (en) * | 2020-04-09 | 2020-08-18 | 海信（山东）空调有限公司 | Air conditioner filter circuit, air conditioner controller and air conditioner |
| CN111641334A (en) * | 2020-06-05 | 2020-09-08 | 广东美的制冷设备有限公司 | Variable frequency control device and air conditioner |
| CN111641334B (en) * | 2020-06-05 | 2021-11-23 | 广东美的制冷设备有限公司 | Variable frequency control device and air conditioner |
| WO2022267220A1 (en) * | 2021-06-22 | 2022-12-29 | 中山大洋电机股份有限公司 | Power supply circuit for motor controller, and motor controller |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090923 Termination date: 20151125 |