CN210780540U - Power circuit for parallel-connection staggered PFC power supply - Google Patents
Power circuit for parallel-connection staggered PFC power supply Download PDFInfo
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- CN210780540U CN210780540U CN201921573203.4U CN201921573203U CN210780540U CN 210780540 U CN210780540 U CN 210780540U CN 201921573203 U CN201921573203 U CN 201921573203U CN 210780540 U CN210780540 U CN 210780540U
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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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Abstract
The utility model provides a power circuit for a parallel-connection interlaced PFC power supply, which is used for the parallel-connection interlaced PFC power supply and comprises a filter circuit, a rectifier bridge, a booster circuit and a detection unit; the input end of the filter circuit is connected with an alternating current power supply, and the filter circuit comprises at least two common-mode inductors which are connected in series and used for filtering common-mode electromagnetic interference signals; the rectifier bridge is connected with the output end of the filter circuit and used for converting input alternating-current voltage into direct-current voltage; the input end of the booster circuit is connected with the output end of the rectifier bridge and is used for boosting the direct current output by the rectifier bridge; the detection unit is connected with the booster circuit and used for detecting an input voltage value, a current value and an output voltage value of the booster circuit. Based on the mutual matching of the modules, the effect of improving the stability and the reliability of the power circuit can be realized while improving the power factor.
Description
Technical Field
The utility model relates to a power supply unit technical field, concretely relates to parallelly connected crisscross power circuit for PFC power.
Background
Due to the wide application of power electronic devices, the quality of the electric energy caused by the power electronic devices is receiving much attention. Therefore, it is one of the research hotspots in the industry to effectively improve the influence of Power Factor Correction (PFC) technology on the quality of power in power electronic devices. The parallel-connection interleaved PFC power supply which occupies a large position in the power supply field at present effectively improves the whole power level of the power supply and simultaneously improves various performances of the power supply on the aspect of power factor correction, thereby becoming a popular research and use object. The power circuit is used as an important module in a parallel interleaving PFC power supply, plays a crucial role in the aspect of power factor correction, the development of the technology is not mature at present, and although various power circuits on the market can achieve certain improvement in power factors at present, the stability of the power circuit is still deficient to a certain extent.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a connect in parallel crisscross power circuit for PFC power realizes improving the effect of its stability and reliability when promoting the power factor.
The utility model provides a power circuit for a parallel-connection interlaced PFC power supply, which is used for the parallel-connection interlaced PFC power supply and comprises a filter circuit, a rectifier bridge, a booster circuit and a detection unit;
the input end of the filter circuit is connected with an alternating current power supply, and the filter circuit comprises at least two common-mode inductors which are connected in series and used for filtering common-mode electromagnetic interference signals;
the rectifier bridge is connected with the output end of the filter circuit and used for converting input alternating-current voltage into direct-current voltage;
the input end of the booster circuit is connected with the output end of the rectifier bridge and is used for boosting the direct current output by the rectifier bridge;
the detection unit is connected with the booster circuit and used for detecting an input voltage value, a current value and an output voltage value of the booster circuit.
Preferably, the boost circuit is specifically composed of two groups of boost branches which are mutually connected in parallel and staggered, the output end of the boost circuit is connected with a load, and each group of boost branches comprises an inductor, a diode and two switching tubes;
the inductor is connected with the diode and the two switching tubes in series;
each switching tube is connected in series with a driving circuit for changing a grid driving waveform.
Preferably, the switching tube is an MOS tube.
Preferably, the number of the driving circuits is four, each driving circuit is formed by connecting a driving resistor and a driving diode in parallel, the cathode of the driving diode is the input end of the driving circuit, and the input end of the driving circuit is connected with a current driver;
the driving resistor is used for slowing down the opening time of the switching tube, and the driving diode is used for accelerating the closing time of the switching tube.
Preferably, the detection unit includes an input voltage detection unit and an output voltage detection unit;
the input voltage detection unit is formed by connecting a plurality of resistors in series, the detection end of the input voltage detection unit is connected with the input end of the booster circuit, and the output end of the input voltage detection unit is connected with a control circuit;
the output voltage detection unit is composed of a plurality of resistors connected in series, the detection end of the output voltage detection unit is connected with the output end of the booster circuit, and the output end of the output voltage detection unit is connected with the control circuit.
Preferably, the detection unit further comprises a current sampling unit, the detection ends of two groups of current sampling units with the same structure are respectively connected with the two boosting branches, the output end of each current sampling unit is connected with the control circuit, and each current sampling unit is provided with a sampling inductor, a plurality of diodes and a resistor;
the primary coil of the sampling inductor is connected in series in the boost circuit, particularly in series with the switching tube, the secondary coil of the sampling inductor is connected in series in the current sampling unit, and the sampling inductor is used for sampling the current passing through the boost circuit.
Preferably, the parallel interleaving PFC power supply further comprises a filter capacitor bank, and the filter capacitor bank is connected with the output end of the boost circuit and used for filtering an alternating current component, so that the output voltage is more stable.
The utility model has the advantages that:
the utility model provides a power circuit for a parallel staggered PFC power supply, which comprises a filter circuit, a rectifier bridge, a booster circuit and a detection unit; the input end of the filter circuit is connected with an alternating current power supply, and the filter circuit comprises at least two common-mode inductors which are connected in series and used for filtering common-mode electromagnetic interference signals; the rectifier bridge is connected with the output end of the filter circuit and used for converting input alternating-current voltage into direct-current voltage; the input end of the booster circuit is connected with the output end of the rectifier bridge and is used for boosting the direct current output by the rectifier bridge; the detection unit is connected with the booster circuit and used for detecting an input voltage value, a current value and an output voltage value of the booster circuit. Based on the mutual matching of the modules, the effect of improving the stability and the reliability of the power circuit can be realized while improving the power factor.
Drawings
Fig. 1 is a block diagram of the present invention;
fig. 2 is a schematic diagram of the filter circuit of the present invention;
fig. 3 is a schematic diagram of the structure of the rectifier bridge, the boost circuit, the detection unit and the filter capacitor set of the present invention.
Detailed Description
For a better understanding of the present invention, the following further description is given in conjunction with the following embodiments and accompanying drawings.
As shown in fig. 1, fig. 2 and fig. 3, the utility model provides a parallel-connection interleaved power circuit for PFC power supply, which is used for parallel-connection interleaved PFC power supply, and comprises a filter circuit, a rectifier bridge, a boost circuit and a detection unit;
the input end of the filter circuit is connected with an alternating current power supply, and comprises at least two common-mode inductors L3 and L4 which are connected in series, and capacitors C1, C2 and C4 are connected in parallel at two ends of the common-mode inductors L3 and L4 and used for filtering common-mode electromagnetic interference signals;
the rectifier bridges are provided with two groups of DB1 and DB2 with the same structure, and the two groups of rectifier bridges DB1 and DB2 are respectively connected with the output end of the filter circuit and used for converting input alternating-current voltage into direct-current voltage;
the input end of the booster circuit is connected with the output end of the rectifier bridge and is used for boosting the direct current output by the rectifier bridge;
the detection unit is connected with the booster circuit and used for detecting an input voltage value, a current value and an output voltage value of the booster circuit.
Further, as shown in fig. 3, the boost circuit is specifically composed of two groups of boost branches which are mutually connected in parallel and staggered, and is divided into a first boost branch and a second boost branch, the two groups of boost branches have the same structure, the output end of the boost circuit is connected with a load, and each group of boost branch comprises an inductor, a diode and two switching tubes;
in the first boost branch circuit, the inductor LM1 is connected in series with the diode D1, the two switching tubes Q1 and Q2, and the drain end of each switching tube is connected with one end of the inductor LM1 and one end of the diode D1, one end of the inductor LM1 is the input end of the boost circuit, and is connected with the output end of the rectifier bridge DB1, and is used for receiving the dc voltage output by the rectifier bridge DB 1.
Each switching tube is connected in series with a driving circuit, specifically, the gate end of the switching tube is connected with the driving circuit, and the driving circuit is used for changing the driving waveform of the gate.
Further, as shown in fig. 3, the switching tube is a MOS tube.
Further, as shown in fig. 3, the gate terminal of each switching tube in the boost circuit is connected in series with the driving circuit, that is, there are four sets of driving circuits with the same structure, taking the driving circuit connected to the switching tube Q1 as an example, the driving circuit is composed of a driving resistor R4 and a driving diode D4 connected in parallel, the cathode of the driving diode D4 is the input terminal of the driving circuit, the input terminal of the driving circuit is connected to the output pin 4 of a current driver, the anode of the driving diode D4 is the output terminal of the driving circuit, and the output terminal of the driving circuit is connected to the gate terminal of the switching tube Q1, and the design of the driving circuit can change the gate driving waveform of the switching tube Q1, thereby affecting the time for opening or closing the switching tube Q1.
Specifically, in an embodiment of the present invention, there is a large parasitic capacitance between the gate and the source of the switching tube Q1, when the current driver opens the release signal of the switching tube Q1, the current limiting function of the driving resistor R4 makes the voltage jump of the capacitor on the switching tube Q1 relatively gentle, so as to slow down the on-time of the switching tube, which is beneficial to reducing its interference, when the current driver closes the release signal of the switching tube Q1, the parasitic capacitance discharges, the driving diode D4 turns on, and accelerates the off-time of the switching tube Q1, thereby reducing power consumption.
Further, as shown in fig. 3, the detection unit includes an input voltage detection unit, an output voltage detection unit;
the input voltage detection unit is composed of a plurality of resistors connected in series, the detection end of the input voltage detection unit is connected with the input end of the booster circuit, the output end of the input voltage detection unit is connected with a control circuit, and the input voltage detection unit is used for detecting the input voltage of the booster circuit and transmitting data to the control circuit;
the output voltage detection unit is formed by connecting a plurality of resistors in series, the detection end of the output voltage detection unit is connected with the output end of the booster circuit, the output end of the output voltage detection unit is connected with the control circuit, and the output voltage detection unit is used for detecting the output voltage of the booster circuit and transmitting data to the control circuit.
Further, as shown in fig. 3, the detection unit further includes a current sampling unit, two sets of current sampling units with the same structure are respectively connected to the two voltage boosting branches, a detection end of the current sampling unit is connected to the voltage boosting circuit, and an output end of the current sampling unit is connected to the control circuit. Taking one of the groups as an example, the current sampling unit specifically includes a sampling inductor L2 and several diodes and resistors; the current sampling unit is provided with a sampling inductor L6, a plurality of diodes and resistors;
the primary coil of the sampling inductor L2 is connected in series in the voltage boost circuit, in particular, in series with the switching tube Q1, the secondary coil of the sampling inductor L2 is connected in series in the current sampling unit, and the sampling inductor L6 is used for sampling the current passing through the voltage boost circuit.
Further, as shown in fig. 3, the parallel-interleaved PFC power supply further includes a filter capacitor bank, where the filter capacitor bank is composed of three capacitors C5, C6, and C43 connected in parallel, and one end of the filter capacitor bank is connected to the output end of the boost circuit, and the other end of the filter capacitor bank is connected to the input end of the load, so as to filter out an alternating current component, and make the output voltage more stable.
Specifically, in an embodiment of the present invention, the ac power supply outputs ac power to the filter circuit, the filter circuit is configured to filter common-mode electromagnetic interference signals and output processed voltage to the rectifier bridge, the rectifier bridge is composed of four diodes, and is configured to receive ac power output by the filter circuit and convert the ac power into dc power, and output dc power to the voltage boost circuit, the voltage boost circuit is connected to the input voltage detection unit, the output voltage detection unit, and the current sampling unit, the input voltage detection unit, the output voltage detection unit, and the current sampling unit are configured to detect input voltage, current, and output voltage of the voltage boost circuit and transmit the detected input voltage, current, and output voltage to a control module, the current driver is configured to output corresponding current to the switching tube in the voltage boost circuit through the driving circuit, so as to control the switching of the switching tube, the direct current output by the rectifier bridge can be boosted by controlling the on-off state of the switch tube, and the boosted direct current is output to a load through the filter capacitor bank.
It should be emphasized that the embodiments described herein are illustrative and not restrictive, and thus the present invention is not limited to the embodiments described in the detailed description, but also falls within the scope of the present invention, in any other embodiments derived by those skilled in the art according to the technical solutions of the present invention.
Claims (7)
1. A power circuit for a parallel interleaved PFC power supply is used for the parallel interleaved PFC power supply, and is characterized in that: the power circuit for the parallel interleaved PFC power supply comprises a filter circuit, a rectifier bridge, a booster circuit and a detection unit;
the input end of the filter circuit is connected with an alternating current power supply, and the filter circuit comprises at least two common-mode inductors which are connected in series and used for filtering common-mode electromagnetic interference signals;
the rectifier bridge is connected with the output end of the filter circuit and used for converting input alternating-current voltage into direct-current voltage;
the input end of the booster circuit is connected with the output end of the rectifier bridge and is used for boosting the direct current output by the rectifier bridge;
the detection unit is connected with the booster circuit and used for detecting an input voltage value, a current value and an output voltage value of the booster circuit.
2. The power circuit for a parallel interleaved PFC power supply of claim 1, wherein: the boost circuit is composed of two groups of boost branches which are mutually connected in parallel and staggered, the output end of the boost circuit is connected with a load, and each group of boost branches comprises an inductor, a diode and two switching tubes;
the inductor is connected with the diode and the two switching tubes in series;
each switching tube is connected in series with a driving circuit for changing a grid driving waveform.
3. The power circuit for a parallel interleaved PFC power supply of claim 2, wherein: the switch tube is an MOS tube.
4. The power circuit for a parallel interleaved PFC power supply of claim 2, wherein: the driving circuit comprises four groups, each group of driving circuits is formed by connecting a driving resistor and a driving diode in parallel, the cathode of the driving diode is the input end of the driving circuit, and the input end of the driving circuit is connected with a current driver;
the driving resistor is used for slowing down the opening time of the switching tube, and the driving diode is used for accelerating the closing time of the switching tube.
5. The power circuit for a parallel interleaved PFC power supply of claim 2, wherein: the detection unit comprises an input voltage detection unit and an output voltage detection unit;
the input voltage detection unit is formed by connecting a plurality of resistors in series, the detection end of the input voltage detection unit is connected with the input end of the booster circuit, and the output end of the input voltage detection unit is connected with a control circuit;
the output voltage detection unit is composed of a plurality of resistors connected in series, the detection end of the output voltage detection unit is connected with the output end of the booster circuit, and the output end of the output voltage detection unit is connected with the control circuit.
6. The power circuit for a parallel interleaved PFC power supply of claim 5, wherein: the detection unit also comprises a current sampling unit, the detection ends of two groups of current sampling units with the same structure are respectively connected with the two boosting branches, the output end of the current sampling unit is connected with the control circuit, and each group of current sampling unit is provided with a sampling inductor, a plurality of diodes and resistors;
the primary coil of the sampling inductor is connected in series in the boost circuit, particularly in series with the switching tube, the secondary coil of the sampling inductor is connected in series in the current sampling unit, and the sampling inductor is used for sampling the current passing through the boost circuit.
7. The power circuit for a parallel interleaved PFC power supply of claim 1, wherein: the power circuit for the parallel connection staggered PFC power supply further comprises a filter capacitor bank, wherein the filter capacitor bank is connected with the output end of the booster circuit and used for filtering alternating current components, and the output voltage is more stable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921573203.4U CN210780540U (en) | 2019-09-20 | 2019-09-20 | Power circuit for parallel-connection staggered PFC power supply |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921573203.4U CN210780540U (en) | 2019-09-20 | 2019-09-20 | Power circuit for parallel-connection staggered PFC power supply |
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| CN210780540U true CN210780540U (en) | 2020-06-16 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113271025A (en) * | 2021-07-05 | 2021-08-17 | 深圳前海云充科技有限公司 | Alternating current-to-direct current circuit and charging converter |
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2019
- 2019-09-20 CN CN201921573203.4U patent/CN210780540U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113271025A (en) * | 2021-07-05 | 2021-08-17 | 深圳前海云充科技有限公司 | Alternating current-to-direct current circuit and charging converter |
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