CN103117653A - Sampling device and method of bridgeless positive feedback circuit (PFC) system - Google Patents
Sampling device and method of bridgeless positive feedback circuit (PFC) system Download PDFInfo
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- CN103117653A CN103117653A CN2011103628023A CN201110362802A CN103117653A CN 103117653 A CN103117653 A CN 103117653A CN 2011103628023 A CN2011103628023 A CN 2011103628023A CN 201110362802 A CN201110362802 A CN 201110362802A CN 103117653 A CN103117653 A CN 103117653A
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- 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 invention relates to a sampling device and a method of a bridgeless positive feedback circuit (PFC) system. The sampling device of the bridgeless PFC system comprises a diverter and an isolation operational amplifier. The diverter is connected between a first power source input end of the bridgeless PFC system and a first input end of a rectifier module of the bridgeless PFC system. A first input end of the isolation operational amplifier is connected with the first power source input end. A second input end of the isolation operational amplifier is connected with the first input end of the rectifier module. An output end of the isolation operational amplifier is connected with a control module of the bridgeless PFC system. Based on a power source input current sampling signal output by the isolation operational amplifier, the control module controls opening and closing of a transistor topology module of the bridgeless PFC system. The transistor topology module comprises a first transistor and a second transistor. Through the sampling device and the method of the bridgeless PFC system, the power source input current sampling signal of the bridgeless PFC system can be easily and conveniently obtained.
Description
Technical field
The present invention relates to power factor correction (Power Factor Correction, be called for short PFC) system, more particularly, relate to sampling apparatus and the method for 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 Active Power Factor Correction (Active Power Factor Correction) system regulates.Compare with traditional Active Power Factor Correction 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.
There is no at present the device of the interchange input current of the non-bridge PFC system that can sample simply and effectively.
Summary of the invention
The technical problem to be solved in the present invention is, for the very difficult defective of interchange input current of the above-mentioned sampling non-bridge PFC system of prior art, provides a kind of device of interchange input current of the non-bridge PFC system that can sample simply and effectively.
The technical solution adopted for the present invention to solve the technical problems is: construct the sampling apparatus of a kind of non-bridge PFC system, comprising:
Shunt, described shunt are connected between the first input end of rectification module of the first power input of described non-bridge PFC system and described non-bridge PFC system;
The isolation operational amplifier, the first input end of described isolation operational amplifier connects described the first power input, the second input of described isolation operational amplifier connects the first input end of described rectification module, the output of described isolation operational amplifier connects the control module of described non-bridge PFC system, and described control module is controlled the switch of the transistor topography module of described non-bridge PFC system based on the power supply input current sampled signal of described isolation operational amplifier output;
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 described non-bridge PFC system through the first inductance, the drain electrode of described the first transistor is connected to the second input of described rectification module simultaneously, the source electrode of described the first transistor connects the source electrode of described transistor seconds, the drain electrode of described transistor seconds connects first input end and the described shunt of described rectification module, the grid of described the first transistor be connected the grid of transistor seconds and connect described control module.
In the sampling apparatus of non-bridge PFC of the present invention system, described transistor topography module further comprises the 3rd transistor and the 4th transistor, the wherein said the 3rd transistorized drain electrode connects the second source input of described non-bridge PFC system through the second inductance, the described the 3rd transistorized drain electrode is connected to the second input of described rectification module simultaneously, the described the 3rd transistorized source electrode connects the described the 4th transistorized source electrode, the described the 4th transistorized drain electrode connects the first input end of described rectification module, the described the 3rd transistorized grid be connected the 4th transistorized grid and connect described control module.
In the sampling apparatus of non-bridge PFC of the present invention system, described rectification module comprises the first diode, the second diode, the 3rd diode and the 4th diode, the drain electrode of the described the first transistor of anodic bonding of wherein said the first diode and the negative electrode of described the 3rd diode, the anode of described the first diode is the second input of described rectification module, the negative electrode of described the first diode connects the negative electrode of described the second diode, the tie point of the negative electrode of the negative electrode of described the first diode and described the second diode is the output of described rectification module, the anode of described the second diode is the first input end of described rectification module and the negative electrode that connects described the 4th diode, the anodic bonding control ground of described the 4th diode and the anode of described the 3rd diode, the negative electrode of described the 3rd diode connects the anode of described the first diode.
In the sampling apparatus of non-bridge PFC of the present invention system, the sampling apparatus of described non-bridge PFC system further comprises the output that is connected to described rectification module and the output module between the control ground.
In the sampling apparatus of non-bridge PFC of the present invention system, described output module comprises the first electric capacity and the first resistance, and described the first electric capacity and described the first resistance are connected in parallel between the output and described control ground of described rectification module.
The technical solution adopted for the present invention to solve the technical problems is: construct the method for sampling of a kind of non-bridge PFC system, comprising:
S1, use the input current of the described non-bridge PFC of the sampling apparatus continuous sampling system of above-mentioned arbitrary non-bridge PFC system;
The input current of S2, sample-based is controlled transistorized switch in the described non-bridge PFC system to realize the continuous operation mode of described non-bridge PFC system.
In the method for sampling of non-bridge PFC of the present invention system, in described step S2, adopt the average current method to control transistorized switch in the described non-bridge PFC system to realize the continuous operation mode of described non-bridge PFC system.
Implement sampling apparatus and the method for non-bridge PFC of the present invention system, can obtain simply and easily the power supply input current sampled signal of non-bridge PFC system.Further, this power supply input current sampled signal can be sent into the non-bridge PFC system control module and be used for follow-up control or processing, thereby so that the control of non-bridge PFC system is more easy.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples, 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 the first embodiment of the sampling apparatus of non-bridge PFC of the present invention system;
Fig. 3 is according to the power supply input current sampled signal of the sampling apparatus sampling of the non-bridge PFC system of the first embodiment of the present invention and the actual waveform figure of input voltage sampled signal;
Fig. 4 is the circuit theory diagrams of the second embodiment of the sampling apparatus of non-bridge PFC of the present invention system.
Embodiment
Fig. 2 is the circuit theory diagrams of the first embodiment of the sampling apparatus of non-bridge PFC of the present invention system.Fig. 2 shows the sampling apparatus of H bridge non-bridge PFC of the present invention system.As shown in Figure 2, this sampling apparatus comprises shunt and isolation 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 diverter function.Described 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 of AC power VAC and described non-bridge PFC system.The first input end of described isolation operational amplifier U1 connects described the first power input A, and the second input of described isolation operational amplifier U1 connects the first input end C of described rectification module 300.The output of described isolation operational amplifier U1 connects the control module (not shown) of described non-bridge PFC system.Described control module is controlled the switch of the transistor topography module 200 of described non-bridge PFC system based on the power supply input current sampled signal of described isolation operational amplifier U1 output.At this, this isolation operational amplifier U1 can be any suitable isolation operation amplifier device or module, such as C790, the C784 of Avago (AVAGO) company, HCPL7840 etc.The first input end of this isolation operational amplifier can be input in the same way, also can be inverting input.In like manner, the second input of this isolation operational amplifier can be reverse input end, also can be in-phase input end.
In this embodiment, described transistor topography module 200 comprises transistor S1 and transistor S2.The drain electrode of described transistor S1 is through the second source input B of the AC power VAC of the described non-bridge PFC of inductance L 1 connection system.The drain electrode of described transistor S1 is connected to the second input E of described rectification module 300 simultaneously.The source electrode of described transistor S1 connects the source electrode of described transistor S2.The drain electrode of described transistor S2 connects first input end C and the described shunt resistance R2 of described rectification module 300.The grid of described transistor S1 be connected the grid of transistor S2 and connect described control module.This transistor is mos field effect transistor preferably.Certainly, this transistor also can be the transistor of other types, such as transistor, Schottky-barrier gate field effect transistor, igbt, static induction transistor etc.).
In this embodiment, described rectification module 300 comprises diode D1, diode D2, diode D3 and diode D4.The drain electrode of the described transistor S1 of the anodic bonding of wherein said diode D1 and the negative electrode of described diode D3.The negative electrode of described diode D1 connects the negative electrode of described diode D2, and the anode of described diode D2 is the first input end C of described rectification module 300 and the negative electrode that connects described diode D4.The anodic bonding control ground of described diode D4 and the anode of described diode D3.The negative electrode of described diode D3 connects the anode of described diode D1.
In the present embodiment, described output module 400 comprises capacitor C 1 and resistance R 2, and described capacitor C 1 and resistance R 2 are connected in parallel between the output D and described control ground of described rectification module 300.The output D of described rectification module 300 is the tie point of the negative electrode of the negative electrode of described diode D1 and described diode D2.
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 instruction of the present invention, those skilled in the art can be as required, any suitable rectification module 300 of Choice and design, control module and output module 400.At this, the present invention is not subjected to 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 isolation operational amplifier U1.Control module just can utilize this detection signal to control the switch of transistor S1 and transistor S2 in the transistor topography module 200, 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 etc.Those skilled in the art can realize above-mentioned control fully according to instruction of the present invention, therefore this have been stated with regard to no longer tiring out.
Generally speaking, the difficult acquisition of the power supply input current sampled signal of PFC system; And take the power supply input current sampled signal more difficult acquisition of PFC system negative busbar as the H bridge non-bridge PFC system on control ground.And adopt the sampling apparatus of H bridge non-bridge PFC of the present invention system, can obtain simply and easily the power supply input current sampled signal of H bridge non-bridge PFC system.Further, this power supply input current sampled signal can be sent into the non-bridge PFC system control module and be used for follow-up control or processing, thereby so that the control of non-bridge PFC system is more easy.
Adopt the sampling apparatus of H bridge non-bridge PFC of the present invention system, in conjunction with above-mentioned average current method, peak current method, current tracking method H bridge non-bridge PFC system is controlled again, can realize that the power supply input current follows power input voltage in 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 the first embodiment of the present invention and the actual waveform figure (V) of input voltage sampled signal.As shown in Figure 3, the total harmonic distortion of power supply input current sampled signal is 3.9%.Can satisfy various standards to the requirement of total harmonic distortion.
Fig. 4 is the circuit theory diagrams of the second embodiment of the sampling apparatus of non-bridge PFC of the present invention system.Fig. 4 shows the sampling apparatus of staggered H bridge non-bridge PFC of the present invention system.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 isolation 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 diverter function.Described 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 of AC power VAC and described non-bridge PFC system.The first input end of described isolation operational amplifier U1 connects described the first power input A, and the second input of described isolation operational amplifier U1 connects the first input end C of described rectification module 300.The output of described isolation operational amplifier U1 connects the control module (not shown) of described non-bridge PFC system.At this, this isolation operational amplifier U1 can be any suitable isolation operation amplifier device or module, such as C790, the C784 of Avago (AVAGO) company, HCPL7840 etc.The first input end of this isolation operational amplifier can be input in the same way, also can be inverting input.In like manner, the second input of this isolation operational amplifier can be reverse input end, also can be in-phase input end.Described control module is controlled the switch of the transistor topography module 200 of described non-bridge PFC system based on the power supply input current sampled signal of described isolation operational amplifier U1 output.
In this embodiment, described 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 described non-bridge PFC of inductance L 1 connection system.The source electrode of described transistor S1 connects the source electrode of described transistor S2.The drain electrode of described transistor S2 connects the first input end C of described rectification module 300.The drain electrode of described transistor S3 is connected to the second input E of described rectification module 300, and the drain electrode of described transistor S3 is through the second source input B of the described non-bridge PFC of inductance L 2 connections system.The source electrode of described transistor S3 connects the source electrode of described transistor S4.The drain electrode of described transistor S4 connects the first input end C of described rectification module 300.Described transistor S1, transistor S2, transistor S3 and transistor S4 are connected grid and are connected described control module.
In this embodiment, described rectification module 300 comprises diode D1, diode D2, diode D3 and diode D4.The negative electrode of the drain electrode of the described transistor S3 of the anodic bonding of wherein said diode D1, the drain electrode of described transistor S1 and described diode D3.The negative electrode of described diode D1 is the output D of described rectification module 300 and the negative electrode that connects described diode D2.The anode of described diode D2 is the first input end C of described rectification module 300 and the negative electrode that connects described diode D4.The anodic bonding control ground of described diode D4 and the anode of described diode D3, the negative electrode of described diode D3 connects the anode of described diode D1.
In the present embodiment, described output module 400 comprises capacitor C 1 and resistance R 1, and described capacitor C 1 and resistance R 1 are connected in parallel between the output D and described control ground of described 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 isolation operational amplifier U1.Control module just can utilize this detection signal to control the switch of transistor S1 in the transistor topography module 200, transistor S2, transistor S3 and transistor S4, 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 seemingly just has been not repeated at this.
Therefore, implement the sampling apparatus of non-bridge PFC of the present invention system, can obtain simply and easily the power supply input current sampled signal of non-bridge PFC system.Further, this power supply input current sampled signal can be sent into the non-bridge PFC system control module and be used for follow-up control or processing, thereby so that the control of non-bridge PFC system is more easy.According to instruction of the present invention, those skilled in the art also can be applied to sampling apparatus of the present invention in other active or passive PFC systems.
Further, the present invention also provides the method for sampling of a kind of non-bridge PFC system.The method can comprise the input current of the described non-bridge PFC of the sampling apparatus continuous sampling system that adopts aforementioned any one non-bridge PFC system, and the input current of sample-based is controlled transistorized switch in the described non-bridge PFC system to realize the continuous operation mode of described non-bridge PFC system.When introducing the sampling apparatus of non-bridge PFC of the present invention system, to how adopting this device to realize that the method for sampling of this non-bridge PFC system is described in detail.Based on above-mentioned introduction, those skilled in the art can understand and realize the method for sampling of this non-bridge PFC system, just have been not repeated at this.
Although the present invention describes by specific embodiment, it will be appreciated by those skilled in the art that, without departing from the present invention, can also carry out various conversion and be equal to alternative the present invention.Therefore, the present invention is not limited to disclosed specific embodiment, and should comprise the whole execution modes that fall in the claim scope of the present invention.
Claims (7)
1. the sampling apparatus of a non-bridge PFC system is characterized in that, comprising:
Shunt, described shunt are connected between the first input end of rectification module of the first power input of described non-bridge PFC system and described non-bridge PFC system;
The isolation operational amplifier, the first input end of described isolation operational amplifier connects described the first power input, the second input of described isolation operational amplifier connects the first input end of described rectification module, the output of described isolation operational amplifier connects the control module of described non-bridge PFC system, and described control module is controlled the switch of the transistor topography module of described non-bridge PFC system based on the power supply input current sampled signal of described isolation operational amplifier output;
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 described non-bridge PFC system through the first inductance, the drain electrode of described the first transistor is connected to the second input of described rectification module simultaneously, the source electrode of described the first transistor connects the source electrode of described transistor seconds, the drain electrode of described transistor seconds connects first input end and the described shunt of described rectification module, the grid of described the first transistor be connected the grid of transistor seconds and connect described control module.
2. the sampling apparatus of non-bridge PFC according to claim 1 system, it is characterized in that, described transistor topography module further comprises the 3rd transistor and the 4th transistor, the wherein said the 3rd transistorized drain electrode connects the second source input of described non-bridge PFC system through the second inductance, the described the 3rd transistorized drain electrode is connected to the second input of described rectification module simultaneously, the described the 3rd transistorized source electrode connects the described the 4th transistorized source electrode, the described the 4th transistorized drain electrode connects the first input end of described rectification module, the described the 3rd transistorized grid be connected the 4th transistorized grid and connect described control module.
3. the sampling apparatus of non-bridge PFC according to claim 1 system, it is characterized in that, described rectification module comprises the first diode, the second diode, the 3rd diode and the 4th diode, the drain electrode of the described the first transistor of anodic bonding of wherein said the first diode and the negative electrode of described the 3rd diode, the anode of described the first diode is the second input of described rectification module, the negative electrode of described the first diode connects the negative electrode of described the second diode, the tie point of the negative electrode of the negative electrode of described the first diode and described the second diode is the output of described rectification module, the anode of described the second diode is the first input end of described rectification module and the negative electrode that connects described the 4th diode, the anodic bonding control ground of described the 4th diode and the anode of described the 3rd diode, the negative electrode of described the 3rd diode connects the anode of described the first diode.
4. the sampling apparatus of the described non-bridge PFC of arbitrary claim system is characterized in that according to claim 1-3, and the sampling apparatus of described non-bridge PFC system further comprises the output that is connected to described 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, described output module comprises the first electric capacity and the first resistance, and described the first electric capacity and described the first resistance are connected in parallel between the output and described control ground of described rectification module.
6. the method for sampling of a non-bridge PFC system is characterized in that, comprising:
The input current of the described non-bridge PFC of the sampling apparatus continuous sampling system of the described non-bridge PFC of any one system in S1, the use according to claim 1-5;
The input current of S2, sample-based is controlled transistorized switch in the described non-bridge PFC system to realize the continuous operation mode of described non-bridge PFC system.
7. the method for sampling of non-bridge PFC according to claim 6 system is characterized in that, in described step S2, adopts the average current method to control transistorized switch in the described non-bridge PFC system to realize the continuous operation mode of described non-bridge PFC system.
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| CN106655838A (en) * | 2016-12-06 | 2017-05-10 | 珠海清英加德智能装备有限公司 | Bridgeless isolated soft-switching AC-DC conversion power supply |
| CN106685209A (en) * | 2017-02-26 | 2017-05-17 | 合肥科威尔电源系统有限公司 | Interlaced parallel bridge-less PFC circuit controller and control method therefor |
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| CN103117653B (en) | 2016-05-18 |
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