CN202309510U - Sampling apparatus for bridge-free PFC system - Google Patents
Sampling apparatus for bridge-free PFC system Download PDFInfo
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- CN202309510U CN202309510U CN2011204540725U CN201120454072U CN202309510U CN 202309510 U CN202309510 U CN 202309510U CN 2011204540725 U CN2011204540725 U CN 2011204540725U CN 201120454072 U CN201120454072 U CN 201120454072U CN 202309510 U CN202309510 U CN 202309510U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The utility model relates to a sampling apparatus for a bridge-free PFC system, comprising a shunt, which is connected between the first power supply input end of the bridge-free PFC system and the first input end of the rectification module of the bridge-free PFC system; an isolation operation amplifier, wherein the first input end of the isolation operation amplifier is connected with the first power supply input end, the second input end of the isolation operation amplifier is connected with the first input end of the rectification module, the output end of the isolation operation amplifier is connected with the control module of the bridge-free PFC system, the control module controls the on and off of the transistor topology module of the bridge-free PFC system based on power supply input current sampling signals output by the isolation operation amplifier, and the transistor topology module comprises a first transistor and a second transistor. The sampling apparatus for a bridge-free PFC system can be used for simply and conveniently obtaining the power supply input current sampling signals of the bridge-free PFC system.
Description
Technical field
The utility model relates to power factor correction (Power Factor Correction, be called for short PFC) system, more particularly, relates to the sampling apparatus of a kind of non-bridge PFC system.
Background technology
In order to improve power factor, reduce Harmonics of Input content, great majority adopt in communication power supply, and APFC (Active Power Factor Correction) system regulates.Compare with the traditional active power factor calibration system, the non-bridge PFC system uses more extensive in communication power supply.Fig. 1 shows the circuit diagram of H bridge non-bridge PFC (H-Bridge bridgeless PFC) system, and it has two major advantages.The one, circuit structure is simple, and the 2nd, efficient is high.This is because do not have the input rectifying bridge in the whole PFC system, therefore can reduce conduction loss.Yet this has also caused the sampling that exchanges input current very difficult.
Still the device that does not have at present the interchange input current of the non-bridge PFC system that can sample simply and effectively.
The utility model content
The technical problem that the utility model will solve is, to the unusual defective of difficulty of the interchange input current of the above-mentioned sampling non-bridge PFC system of prior art, a kind of device of interchange input current of the non-bridge PFC system that can sample simply and effectively is provided.
The utility model solves the technical scheme that its technical problem adopted: construct the sampling apparatus of a kind of non-bridge PFC system, comprising:
Shunt, said shunt are connected between the first input end of rectification module of first power input and said non-bridge PFC system of said non-bridge PFC system;
Isolate operational amplifier; The first input end of said isolation operational amplifier connects said first power input; Second input of said isolation operational amplifier connects the first input end of said rectification module, and the output of said isolation operational amplifier connects the control module of switch that is used for controlling based on the power supply input current sampled signal of said isolation operational amplifier output the transistor topography module of said non-bridge PFC system;
Wherein said transistor topography module comprises the first transistor and transistor seconds; The drain electrode of wherein said the first transistor connects the second source input of said non-bridge PFC system through first inductance; The drain electrode of said the first transistor is connected to second input of said rectification module simultaneously; The source electrode of said the first transistor connects the source electrode of said transistor seconds; The drain electrode of said transistor seconds connects the first input end and the said shunt of said rectification module, and the grid of said the first transistor is connected said control module with the grid of said transistor seconds.
In the sampling apparatus of the described non-bridge PFC of the utility model system; Said transistor topography module further comprises the 3rd transistor and the 4th transistor; Wherein said the 3rd transistor drain connects the second source input of said non-bridge PFC system through second inductance; Said the 3rd transistor drain is connected to second input of said rectification module simultaneously; The said the 3rd transistorized source electrode connects the said the 4th transistorized source electrode, and said the 4th transistor drain connects the first input end of said rectification module, and the said the 3rd transistorized grid is connected said control module with the said the 4th transistorized grid.
In the sampling apparatus of the described non-bridge PFC of the utility model system; Said rectification module comprises first diode, second diode, the 3rd diode and the 4th diode; The anode of wherein said first diode connects the drain electrode of said the first transistor and the negative electrode of said the 3rd diode; The anode of said first diode is second input of said rectification module; The negative electrode of said first diode connects the negative electrode of said second diode; The tie point of the negative electrode of the negative electrode of said first diode and said second diode is the output of said rectification module; The anode of said second diode is the first input end of said rectification module and the negative electrode that connects said the 4th diode, and the anode of said the 4th diode connects the anode of control ground and said the 3rd diode, and the negative electrode of said the 3rd diode connects the anode of said first diode.
In the sampling apparatus of the described non-bridge PFC of the utility model system, the sampling apparatus of said non-bridge PFC system further comprises the output that is connected to said rectification module and the output module between the control ground.
In the sampling apparatus of the described non-bridge PFC of the utility model system, said output module comprises first electric capacity and first resistance, and said first electric capacity and said first resistance are connected in parallel between the output and said control ground of said rectification module.
Implement the sampling apparatus of the non-bridge PFC system of the utility model, can obtain the power supply input current sampled signal of non-bridge PFC system simply and easily.Further, can this power supply input current sampled signal be sent into the non-bridge PFC system control module and be used for follow-up control or processing, thereby make that the control of non-bridge PFC system is more easy.
Description of drawings
To combine accompanying drawing and embodiment that the utility model is described further below, in the accompanying drawing:
Fig. 1 is the circuit diagram of H bridge non-bridge PFC (the H-Bridge bridgeless PFC) system of prior art;
Fig. 2 is the circuit theory diagrams of first embodiment of sampling apparatus of the non-bridge PFC system of the utility model;
Fig. 3 is according to the power supply input current sampled signal of the sampling apparatus sampling of the non-bridge PFC system of first embodiment of the utility model and the actual waveform figure of input voltage sampled signal;
Fig. 4 is the circuit theory diagrams of second embodiment of sampling apparatus of the non-bridge PFC system of the utility model.
Embodiment
Fig. 2 is the circuit theory diagrams of first embodiment of sampling apparatus of the non-bridge PFC system of the utility model.Fig. 2 shows the sampling apparatus of the H bridge non-bridge PFC system of the utility model.As shown in Figure 2, this sampling apparatus comprises shunt and isolates operational amplifier U1.This shunt can be shunt resistance R2 as shown in Figure 2, also can be also can be other any element, circuit or modules that can realize shunting function.
Said H bridge non-bridge PFC system comprises inductance L 1, transistor topography module 200, rectification module 300 and output module 400.
Wherein, this shunt resistance R2 is connected between the first input end C of rectification module 300 of the first power input A and said non-bridge PFC system of AC power VAC.The first input end of said isolation operational amplifier U1 connects the said first power input A, and second input of said isolation operational amplifier U1 connects the first input end C of said rectification module 300.The output of said isolation operational amplifier U1 connects the control module (not shown) of said non-bridge PFC system.Said control module is controlled the switch of the transistor topography module 200 of said non-bridge PFC system based on the power supply input current sampled signal of said isolation operational amplifier U1 output.At this, this isolation operational amplifier U1 can be any suitable isolation computing amplifying device or module, such as the C790 of Avago (AVAGO) company, C784, HCPL7840 or the like.The first input end of this isolation operational amplifier can be an input in the same way, also can be inverting input.In like manner, second input of this isolation operational amplifier can be a reverse input end, also can be in-phase input end.
In this embodiment, said transistor topography module 200 comprises transistor S1 and transistor S2.The drain electrode of said transistor S1 is through the second source input B of the AC power VAC of the said non-bridge PFC of inductance L 1 connection system.The drain electrode of said transistor S1 is connected to the second input E of said rectification module 300 simultaneously.The source electrode of said transistor S1 connects the source electrode of said transistor S2.The drain electrode of said transistor S2 connects the first input end C and the said shunt resistance R2 of said rectification module 300.The grid of the grid of said transistor S1 and said transistor S2 is connected said control module.This transistor is mos field effect transistor preferably.Certainly, this transistor also can be the transistor of other types, like transistor, Schottky-barrier gate field effect transistor, igbt, static induction transistor or the like).
In this embodiment, said rectification module 300 comprises diode D1, diode D2, diode D3 and diode D4.The anode of wherein said diode D1 connects the drain electrode of said transistor S1 and the negative electrode of said diode D3.The negative electrode of said diode D1 connects the negative electrode of said diode D2, and the anode of said diode D2 is the first input end C of said rectification module 300 and the negative electrode that connects said diode D4.The anode of said diode D4 connects the anode of control ground and said diode D3.The negative electrode of said diode D3 connects the anode of said diode D1.
In the present embodiment, said output module 400 comprises capacitor C 1 and resistance R 2, and said capacitor C 1 and resistance R 2 are connected in parallel between the output D and said control ground of said rectification module 300.The output D of said rectification module 300 is the tie point of negative electrode of negative electrode and the said diode D2 of said diode D1.
Those skilled in the art know that the structure of rectification module 300, control module and output module 400 and its operation principle have been well known in the art.Therefore according to the instruction of the utility model, those skilled in the art can be as required, selects and design any suitable rectification module 300, control module and output module 400.At this, the utility model does not receive the concrete structure of these modules and the restriction of composition.
Shown in the embodiment among Fig. 2, in H bridge non-bridge PFC system, shunt resistance R2 connects with power supply VAC and inductance L 1, just can realize the continuous detecting to power supply input current sampled signal.This detection signal is sent into control module through the output of isolating operational amplifier U1.Control module is come the switch of transistor S1 and transistor S2 in the oxide-semiconductor control transistors topography module 200 with regard to this detection signal capable of using, realizes the continuous operation mode of H bridge non-bridge PFC system.Those skilled in the art know that this control method can adopt any method well known in the art, such as average current method, peak current method, current tracking method or the like.Those skilled in the art can realize above-mentioned control fully according to the instruction of the utility model, therefore this have been stated with regard to no longer tiring out.
Generally speaking, the power supply input current sampled signal of PFC system is difficult obtains; And serve as more difficult acquisition of power supply input current sampled signal of the H bridge non-bridge PFC system on control ground with PFC system negative busbar.And adopt the sampling apparatus of the H bridge non-bridge PFC system of the utility model, can obtain the power supply input current sampled signal of H bridge non-bridge PFC system simply and easily.Further, can this power supply input current sampled signal be sent into the non-bridge PFC system control module and be used for follow-up control or processing, thereby make that the control of non-bridge PFC system is more easy.
Adopt the sampling apparatus of the H bridge non-bridge PFC system of the utility model, combine above-mentioned average current method, peak current method, current tracking method that H bridge non-bridge PFC system is controlled again, can realize that the power supply input current follows power input voltage on phase place.Fig. 3 is according to the power supply input current sampled signal (A) of the sampling apparatus sampling of the non-bridge PFC system of first embodiment of the utility model and the actual waveform figure (V) of input voltage sampled signal.Can know that like Fig. 3 the total harmonic distortion of power supply input current sampled signal is 3.9%.Can satisfy of the requirement of various standards to total harmonic distortion.
Fig. 4 is the circuit theory diagrams of second embodiment of sampling apparatus of the non-bridge PFC system of the utility model.Fig. 4 shows the sampling apparatus of the staggered H bridge non-bridge PFC system of the utility model.Adopt the H bridge non-bridge PFC system of crisscross parallel can improve power density, its operation principle is identical with common H bridge non-bridge PFC system.As shown in Figure 4, this sampling apparatus comprises shunt resistance R2 and isolates operational amplifier U1.This shunt can be shunt resistance R2 as shown in Figure 2, also can be also can be other any element, circuit or modules that can realize shunting function.Said staggered H bridge non-bridge PFC system comprises inductance L 1, L2, transistor topography module 200, rectification module 300 and output module 400.Wherein this shunt resistance R2 is connected between the first input end C of rectification module 300 of the first power input A and said non-bridge PFC system of AC power VAC.The first input end of said isolation operational amplifier U1 connects the said first power input A, and second input of said isolation operational amplifier U1 connects the first input end C of said rectification module 300.The output of said isolation operational amplifier U1 connects the control module (not shown) of said non-bridge PFC system.At this, this isolation operational amplifier U1 can be any suitable isolation computing amplifying device or module, such as the C790 of Avago (AVAGO) company, C784, HCPL7840 or the like.The first input end of this isolation operational amplifier can be an input in the same way, also can be inverting input.In like manner, second input of this isolation operational amplifier can be a reverse input end, also can be in-phase input end.Said control module is controlled the switch of the transistor topography module 200 of said non-bridge PFC system based on the power supply input current sampled signal of said isolation operational amplifier U1 output.
In this embodiment, said transistor topography module 200 comprises transistor S1, transistor S2, transistor S3 and transistor S4, and the drain electrode of wherein said transistor S1 is through the second source input B of the said non-bridge PFC of inductance L 1 connection system.The source electrode of said transistor S1 connects the source electrode of said transistor S2.The drain electrode of said transistor S2 connects the first input end C of said rectification module 300.The drain electrode of said transistor S3 is connected to the second input E of said rectification module 300, and the drain electrode of said transistor S3 is through the second source input B of the said non-bridge PFC of inductance L 2 connections system.The source electrode of said transistor S3 connects the source electrode of said transistor S4.The drain electrode of said transistor S4 connects the first input end C of said rectification module 300.The grid of said transistor S1, transistor S2, transistor S3 and transistor S4 is connected said control module.
In this embodiment, said rectification module 300 comprises diode D1, diode D2, diode D3 and diode D4.The anode of wherein said diode D1 connects the drain electrode of the drain electrode of said transistor S3, said transistor S1 and the negative electrode of said diode D3.The negative electrode of said diode D1 is the output D of said rectification module 300 and the negative electrode that connects said diode D2.The anode of said diode D2 is the first input end C of said rectification module 300 and the negative electrode that connects said diode D4.The anode of said diode D4 connects the anode of control ground and said diode D3, and the negative electrode of said diode D3 connects the anode of said diode D1.
In the present embodiment, said output module 400 comprises capacitor C 1 and resistance R 1, and said capacitor C 1 and resistance R 1 are connected in parallel between the output D and said control ground of said rectification module 300.
Shown in the embodiment among Fig. 4, in staggered H bridge non-bridge PFC system, shunt resistance R2 connects with power supply VAC and inductance L 1, just can realize the continuous detecting to power supply input current sampled signal.This detection signal is sent into control module through the output of isolating operational amplifier U1.Control module is come the switch of transistor S1 in the oxide-semiconductor control transistors topography module 200, transistor S2, transistor S3 and transistor S4 with regard to this detection signal capable of using, realizes the continuous operation mode of staggered H bridge non-bridge PFC system.H bridge non-bridge PFC system class shown in its course of work and principle and Fig. 2 has seemingly been stated with regard to no longer tiring out at this.
Therefore, implement the sampling apparatus of the non-bridge PFC system of the utility model, can obtain the power supply input current sampled signal of non-bridge PFC system simply and easily.Further, can this power supply input current sampled signal be sent into the non-bridge PFC system control module and be used for follow-up control or processing, thereby make that the control of non-bridge PFC system is more easy.According to the instruction of the utility model, those skilled in the art also can be applied to the sampling apparatus of the utility model in other active or passive PFC systems.
Though the utility model describes through specific embodiment, it will be appreciated by those skilled in the art that, under the situation that does not break away from the utility model scope, can also carry out various conversion and be equal to alternative the utility model.Therefore, the utility model is not limited to disclosed specific embodiment, and should comprise the whole execution modes that fall in the utility model claim scope.
Claims (5)
1. the sampling apparatus of a non-bridge PFC system is characterized in that, comprising:
Shunt, said shunt are connected between the first input end of rectification module of first power input and said non-bridge PFC system of said non-bridge PFC system;
Isolate operational amplifier; The first input end of said isolation operational amplifier connects said first power input; Second input of said isolation operational amplifier connects the first input end of said rectification module, and the output of said isolation operational amplifier connects the control module of switch that is used for controlling based on the power supply input current sampled signal of said isolation operational amplifier output the transistor topography module of said non-bridge PFC system;
Wherein said transistor topography module comprises the first transistor and transistor seconds; The drain electrode of wherein said the first transistor connects the second source input of said non-bridge PFC system through first inductance; The drain electrode of said the first transistor is connected to second input of said rectification module simultaneously; The source electrode of said the first transistor connects the source electrode of said transistor seconds; The drain electrode of said transistor seconds connects the first input end and the said shunt of said rectification module, and the grid of said the first transistor is connected said control module with the grid of said transistor seconds.
2. the sampling apparatus of non-bridge PFC according to claim 1 system; It is characterized in that; Said transistor topography module further comprises the 3rd transistor and the 4th transistor; Wherein said the 3rd transistor drain connects the second source input of said non-bridge PFC system through second inductance, and said the 3rd transistor drain is connected to second input of said rectification module simultaneously, and the said the 3rd transistorized source electrode connects the said the 4th transistorized source electrode; Said the 4th transistor drain connects the first input end of said rectification module, and the said the 3rd transistorized grid is connected said control module with the said the 4th transistorized grid.
3. the sampling apparatus of non-bridge PFC according to claim 1 system; It is characterized in that; Said rectification module comprises first diode, second diode, the 3rd diode and the 4th diode; The anode of wherein said first diode connects the drain electrode of said the first transistor and the negative electrode of said the 3rd diode; The anode of said first diode is second input of said rectification module; The negative electrode of said first diode connects the negative electrode of said second diode, and the tie point of the negative electrode of the negative electrode of said first diode and said second diode is the output of said rectification module, and the anode of said second diode is the first input end of said rectification module and the negative electrode that connects said the 4th diode; The anode of said the 4th diode connects the anode of control ground and said the 3rd diode, and the negative electrode of said the 3rd diode connects the anode of said first diode.
4. according to the sampling apparatus of the described non-bridge PFC of arbitrary claim system among the claim 1-3, it is characterized in that the sampling apparatus of said non-bridge PFC system further comprises the output that is connected to said rectification module and the output module between the control ground.
5. the sampling apparatus of non-bridge PFC according to claim 4 system; It is characterized in that; Said output module comprises first electric capacity and first resistance, and said first electric capacity and said first resistance are connected in parallel between the output and said control ground of said rectification module.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011204540725U CN202309510U (en) | 2011-11-16 | 2011-11-16 | Sampling apparatus for bridge-free PFC system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011204540725U CN202309510U (en) | 2011-11-16 | 2011-11-16 | Sampling apparatus for bridge-free PFC system |
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| CN202309510U true CN202309510U (en) | 2012-07-04 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103117653A (en) * | 2011-11-16 | 2013-05-22 | 艾默生网络能源***北美公司 | Sampling device and method of bridgeless positive feedback circuit (PFC) system |
| CN103840681A (en) * | 2012-11-20 | 2014-06-04 | 上海儒竞电子科技有限公司 | Single-phase rectification circuit capable of controlling conduction angle |
| CN103840683A (en) * | 2012-11-20 | 2014-06-04 | 上海儒竞电子科技有限公司 | Single-phase rectification circuit capable of controlling capacitor filtering |
| CN106093533A (en) * | 2016-07-28 | 2016-11-09 | 深圳茂硕电子科技有限公司 | A kind of non-bridge PFC current mode sample circuit |
| CN109962632A (en) * | 2017-12-25 | 2019-07-02 | 中国长城科技集团股份有限公司 | A kind of no bridge rectification circuit and Switching Power Supply |
| CN110417251A (en) * | 2019-07-09 | 2019-11-05 | 广东美的制冷设备有限公司 | Pfc circuit and air conditioner |
-
2011
- 2011-11-16 CN CN2011204540725U patent/CN202309510U/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103117653A (en) * | 2011-11-16 | 2013-05-22 | 艾默生网络能源***北美公司 | Sampling device and method of bridgeless positive feedback circuit (PFC) system |
| CN103117653B (en) * | 2011-11-16 | 2016-05-18 | 艾默生网络能源***北美公司 | The sampling apparatus of non-bridge PFC system and method |
| CN103840681A (en) * | 2012-11-20 | 2014-06-04 | 上海儒竞电子科技有限公司 | Single-phase rectification circuit capable of controlling conduction angle |
| CN103840683A (en) * | 2012-11-20 | 2014-06-04 | 上海儒竞电子科技有限公司 | Single-phase rectification circuit capable of controlling capacitor filtering |
| CN106093533A (en) * | 2016-07-28 | 2016-11-09 | 深圳茂硕电子科技有限公司 | A kind of non-bridge PFC current mode sample circuit |
| CN109962632A (en) * | 2017-12-25 | 2019-07-02 | 中国长城科技集团股份有限公司 | A kind of no bridge rectification circuit and Switching Power Supply |
| CN110417251A (en) * | 2019-07-09 | 2019-11-05 | 广东美的制冷设备有限公司 | Pfc circuit and air conditioner |
| WO2021004451A1 (en) * | 2019-07-09 | 2021-01-14 | 广东美的制冷设备有限公司 | Pfc circuit and air conditioner |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: No. 1510, Kansas Avenue, lureen, Ohio, USA Patentee after: Walteff energy systems company Address before: 1122 F street, Los Angeles, Ohio Patentee before: Emerson Network Power Co., Ltd. |
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| CP03 | Change of name, title or address | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120704 |
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| CX01 | Expiry of patent term |