CN217362900U - CUK PFC converter adopting variable inductor - Google Patents
CUK PFC converter adopting variable inductor Download PDFInfo
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- CN217362900U CN217362900U CN202220991306.8U CN202220991306U CN217362900U CN 217362900 U CN217362900 U CN 217362900U CN 202220991306 U CN202220991306 U CN 202220991306U CN 217362900 U CN217362900 U CN 217362900U
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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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Abstract
The utility model discloses an adopt CUK PFC converter of variable inductance, converter include main power circuit, output voltage feedback and drive circuit, input voltage sampling circuit, variable inductance control circuit and variable inductance calculating circuit. The output voltage feedback and drive circuit outputs PWM waves according to a series of operations on error values to control the on and off of the switching tube, and the variable inductance in the main power circuit realizes the change of inductance values in a half power frequency period according to different bias currents calculated by the variable inductance calculation circuit through the rectified input voltage collected by the input voltage sampling circuit and the rated value of the bus capacitor voltage. The invention realizes the reduction of the voltage of the intermediate energy storage capacitor, reduces the current stress of the switching tube, simultaneously can keep high power factor and reduce the harmonic distortion of the input current.
Description
Technical Field
The utility model relates to an electric energy conversion device's interchange-DC converter technique especially adopts the DCM CUK converter that the transformer inductance realized the high PF value.
Background
The Power Factor Correction (PFC) technology is widely used in power electronic devices because it can reduce input current harmonics, and can be divided into an active PFC technology and a passive PFC technology according to whether an active device is included in a converter, and the active PFC technology has advantages of small volume, low cost, high power factor, and the like.
The CUK PFC converter is one of active PFC converters, has the advantages of being capable of boosting and reducing voltage, continuous in input current and output current, small in pulsation and the like, and is suitable for occasions such as an LED driving power supply. However, when the CUK PFC converter works in a DCM mode, the harmonic distortion of input current is serious, the power factor is low, the voltage of the intermediate energy storage capacitor is overhigh, and the like.
Disclosure of Invention
To the problem that current DCM CUK PFC converter exists, the utility model provides an adopt CUK PFC converter of variable inductance, when aiming at realizing high power factor, energy storage capacitor voltage in the middle of effectively reducing to rectify input current's harmonic distortion, reduce switch tube current stress.
In order to achieve the above object, the utility model provides an adopt CUK PFC converter of variable inductance includes main power circuit, output voltage feedback and drive circuit, input voltage sampling circuit, variable inductance calculating circuit and variable inductance control circuit; the main power circuit mainly comprises an input voltage sourcev in EMI filter, diode rectifier bridge, variable inductorL V Switch tubeS 1 Intermediate energy storage capacitorC 1 Freewheel diodeD 1 Output inductorL 2 Filter capacitorC 2 Load, and method of operating the sameR O (ii) a The input voltage sourcev in The output port of the EMI filter is connected with the input port of the diode rectifier bridge, and the anode of the output port of the diode rectifier bridge is connected with the variable inductorL V Is connected to one end of a variable inductorL V The other end of the switch tubeS 1 Drain electrode and intermediate energy storage capacitorC 1 The positive electrode of the anode is connected with the anode,intermediate energy storage capacitorC 1 Negative electrode and freewheeling diodeD 1 Anode and output inductor ofL 2 Is connected with an output inductorL 2 Another terminal of (1) and a filter capacitorC 2 And a loadR O Is connected with one end of a switch tubeS 1 Source electrode, free wheel diodeD 1 Cathode and filter capacitorC 2 Another end and a loadR O The other end of the diode rectifier bridge is connected with the cathode of the output port of the diode rectifier bridge, and the port is grounded and is a zero potential point.
Furthermore, the output voltage feedback and driving circuit is composed of an output voltage sampling circuit, an operational amplifier A1, a voltage comparator COMP, an RS trigger and a switching tube drive; the negative input port of the error amplifier is connected with the output voltage sampling circuit, the positive input port and the reference voltageU Ref The output port of the operational amplifier A1 is connected with the negative input port of the voltage comparator COMP, and the positive input port of the voltage comparator COMP inputs the sawtooth wave signalv Saw An output port of the voltage comparator COMP is connected with an R port of the RS trigger, an S port of the RS trigger is connected with a clock signal CLK, a Q port of the RS trigger is connected with a driving input port of the switching tube, and an output end of the switching tube is connected with a grid electrode of the switching tube in the main power circuit.
Furthermore, the input voltage sampling circuit mainly comprises a divider resistorR H 、 R L Composition, voltage dividing resistorR H One end of the resistor is connected with the input voltage behind the rectifier bridge, and the other end of the resistor is connected with the resistorR L Connection, resistanceR L And the other end of the same is connected to a reference ground.
Furthermore, the main component of the variable inductance calculating circuit is a digital calculating unit; voltage dividing resistor from input voltage sampling circuitR H 、 R L The voltage signal collected between the two is connected with an ADC1 port of the digital computing unit, an input signal of an ADC2 port of the digital computing unit is a rated calculation value of the voltage of the intermediate energy storage capacitor, and an output port of the variable inductance computing circuitAnd is connected with the variable inductance control circuit.
Furthermore, the main structure of the variable inductance control circuit is a voltage-controlled current source which mainly comprises an operational amplifier A2 and a switch tubeS 2 Bias resistorR bias And (4) forming. The positive input end of the operational amplifier is connected with the output end of the digital computing unit, and the negative input end of the operational amplifier is connected with one end of the bias resistor and the switching tubeS 2 Is connected with the source electrode of the operational amplifier, the output of the operational amplifier is connected with the switch tubeS 2 Is connected with the grid electrode of the switching tubeS 2 Is connected to the auxiliary winding of the variable inductance.
Compared with the prior art, the utility model, beneficial effect as follows.
The utility model provides a pair of adopt CUK PFC converter of variable inductance for CUK PFC converter realizes still can be when guaranteeing high power factor at input, output inductance equal work under DCM mode, energy storage capacitor's voltage in the middle of effectively reducing, and reduces the current stress of switch tube.
Drawings
Fig. 1 is a schematic circuit diagram of a CUK PFC constant voltage output converter using a variable inductor according to the present invention. Wherein 1 is a main power circuit, 2 is an output voltage feedback and driving circuit, 3 is an input voltage sampling circuit, 4 is a variable inductance calculating circuit, and 5 is a variable inductance control circuit.
Fig. 2 is a schematic diagram of a circuit structure of a CUK PFC constant current output converter using a variable inductor according to the present invention. Wherein 1 is a main power circuit, 2 is an output current feedback and driving circuit, 3 is an input voltage sampling circuit, 4 is a variable inductance calculating circuit, and 5 is a variable inductance control circuit.
Fig. 3 is a basic structure diagram of the variable inductor used in the present invention.
Fig. 4 is a control logic diagram of the variable inductance calculating circuit according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts all belong to the protection scope of the present invention.
The utility model provides an adopt CUK PFC converter of varactor, when can realizing high power factor, energy storage capacitor voltage in the middle of effectively reducing to rectify input current's harmonic distortion, reduce switch tube current stress.
In order to facilitate a further understanding of the present invention, the present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1 output voltage feedback and drive circuit, the utility model discloses an output voltage sampling circuit samples output voltage, this voltage signal and reference voltage input operational amplifier A1 simultaneously carry out error compensation, operational amplifier' S output signal again gets into the comparator with sawtooth wave signal and compares, the PWM waveform of output gets into the R port of RS flip-flop, the PWM waveform from Q end output switch pipe according to the clock signal of S port, get into switch tube drive circuit at last, generate switch tube drive signal, the break-make of control switch pipe, thereby realize constant voltage output.
As shown in the input voltage sampling circuit in fig. 1, the utility model discloses a to the input divider resistanceR L Is sampled and is used as an input signal for a digital calculation unit in the variable inductance calculation circuit.
As shown in the variable inductance calculating circuit of FIG. 1, a voltage signal passing through an input voltage sampling circuit enters the variable inductance calculating circuitk· |v in |Whereink=R L /（R H +R L ) The signal and the rated value of the voltage of the intermediate energy-storage capacitor are simultaneously input into a digital computing unit for real-time inductance calculation, the required inductance under the input voltage is calculated, and then a corresponding offset is output according to a variable inductance calculation circuit shown in figure 4Put voltage signalV bias 。
The bias voltage output from 4 is shown as the variable inductance control circuit in FIG. 1V bias The signal is input into the variable inductance control circuit, passes through the voltage-controlled current source, and passes through the bias resistor in the circuitR bias Thereby obtaining a bias current for controlling the variable inductanceI bias Having a value ofI bias =V bias /R bias 。
The specific working principle of the variable inductor is as follows.
The principle of the variable inductance is that controllable direct current bias current is injected into the auxiliary winding, so that the purpose of controlling the saturation degree of the magnetic material is achieved, under the action of an external magnetic field, the magnetic field intensity around a substance to be magnetized changes, the magnetic induction intensity gradually enters a transition area from an unsaturated area, the magnetic permeability of a magnetic medium is changed under the magnetization effect of different degrees, and namely the magnetic permeability can be changed by injecting the direct current bias current. As shown in fig. 3, the utility model discloses a two E shape variable inductance magnetic core structures and winding mode as the picture, both sides are the auxiliary winding of variable inductance, the utility model discloses an increase the bias current numerical value of auxiliary winding of flowing through, can make the magnetic permeability get into the transition region in the auxiliary winding, and the magnetic permeability reduces along with direct current bias current's increase, can know according to the theoretical formula of two E shape inductances, the magnetic permeability of auxiliary winding reduces, and the inductance value also can reduce simultaneously to realize the change of inductance value.
The utility model discloses in every half power frequency cycle, input voltage and middle energy storage capacitor's rating after the rectification through real-time collection carry out the calculation of inductance value, again according to calculating gained inductance value and bias current's corresponding relation output bias voltage, and then obtain bias current through variable inductance control circuit, through the effect of injecting into the bias current of this moment in order to reach the inductance change to variable inductance auxiliary winding, thereby realize reducing current harmonic distortion, guarantee high power factor and effectively reduce middle energy storage capacitor voltage's function.
The above only is the preferred embodiment of the present invention, not limiting the scope of the present invention, all the equivalent structure changes made by the contents of the specification and the drawings under the inventive concept of the present invention, or the direct/indirect application in other related technical fields are included in the patent protection scope of the present invention.
Claims (5)
1. A CUK PFC converter adopting variable inductance is characterized by comprising a main power circuit and a control circuit;
the main power circuit mainly comprises an input voltage sourcev in EMI filter, diode rectifier bridge, variable inductorL V Switch tubeS 1 Intermediate energy storage capacitorC 1 Freewheel diodeD 1 Output inductorL 2 Filter capacitorC 2 Load, and method of operating the sameR O (ii) a Wherein the input voltage sourcev in The output port of the EMI filter is connected with the input port of the diode rectifier bridge, and the anode of the output port of the diode rectifier bridge is connected with the variable inductorL V Is connected to the variable inductanceL V And the other end of the switch tubeS 1 And said intermediate energy storage capacitorC 1 The intermediate energy storage capacitorC 1 And the freewheeling diodeD 1 And the output inductorL 2 Is connected to the output inductorL 2 And the other end of the filter capacitorC 2 And the loadR O Is connected with one end of the switch tubeS 1 Source electrode of, said freewheeling diodeD 1 And the filter capacitorC 2 And the other end of the loadR O The other end of the diode rectifier bridge is connected with the cathode of the output port of the diode rectifier bridge, and the port is grounded;
the control circuit comprises an output voltage feedback and driving circuit, an input voltage sampling circuit, a variable inductance calculating circuit and a variable inductance control circuit.
2. The CUK PFC converter adopting the variable inductor according to claim 1, wherein the output voltage feedback and driving circuit comprises an output voltage sampling circuit, an operational amplifier A1, a voltage comparator COMP, an RS trigger and a switching tube driver; wherein the negative input port of the operational amplifier A1 is accessed by the output voltage sampling circuit, the positive input port of the operational amplifier A1 and a reference voltageU Ref The output port of the operational amplifier A1 is connected with the negative input port of the voltage comparator COMP, and the positive input port of the voltage comparator COMP is connected with the sawtooth wave signalv Saw And an output port of the voltage comparator COMP is connected with an R port of the RS trigger, an S port of the RS trigger is accessed with a clock signal CLK, a Q port of the RS trigger is connected with a driving input port of the switching tube, and a driving output end of the switching tube is connected with a grid electrode of the switching tube in the main power circuit.
3. The CUK PFC converter with variable inductance according to claim 1, wherein the input voltage sampling circuit comprises a voltage dividing resistorR H 、R L (ii) a Wherein the voltage dividing resistorR H Is connected with the input voltage behind the diode rectifier bridge, and the other end is connected with the resistorR L One end is connected with the resistorR L And the other end of the same is connected to a reference ground.
4. The CUK PFC converter of claim 1, wherein the variable inductance calculation circuit comprises a digital calculation unit; wherein the voltage dividing resistor in the input voltage sampling circuitR H Resistance, and a method for manufacturing the sameR L The voltage signal collected between the two is connected with an ADC1 port of the digital computing unit, and an input signal of an ADC2 port of the digital computing unit is a rated calculated value of the voltage of the intermediate energy storage capacitorAnd the output port of the variable inductance calculating circuit is connected with the variable inductance control circuit.
5. The CUK PFC converter with the variable inductor according to claim 1, wherein the variable inductor control circuit comprises an operational amplifier A2 and a switching tubeS 2 Bias resistorR bias (ii) a Wherein the positive input terminal of the operational amplifier is connected to the output terminal of the variable inductance calculating circuit, and the negative input terminal of the operational amplifier A2 is connected to the bias resistorR bias And the switching tubeS 2 Is connected with the source electrode of the operational amplifier A2, the output of the operational amplifier A2 is connected with the switch tubeS 2 Is connected with the grid electrode of the switching tubeS 2 Is connected to the auxiliary winding of said variable inductance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220991306.8U CN217362900U (en) | 2022-04-27 | 2022-04-27 | CUK PFC converter adopting variable inductor |
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| CN202220991306.8U CN217362900U (en) | 2022-04-27 | 2022-04-27 | CUK PFC converter adopting variable inductor |
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| CN217362900U true CN217362900U (en) | 2022-09-02 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116317528A (en) * | 2023-03-14 | 2023-06-23 | 哈尔滨工业大学 | Single-stage single-phase bridgeless voltage-multiplying CUK type PFC converter |
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- 2022-04-27 CN CN202220991306.8U patent/CN217362900U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116317528A (en) * | 2023-03-14 | 2023-06-23 | 哈尔滨工业大学 | Single-stage single-phase bridgeless voltage-multiplying CUK type PFC converter |
| CN116317528B (en) * | 2023-03-14 | 2024-04-05 | 哈尔滨工业大学 | Single-stage single-phase bridgeless voltage-multiplying CUK type PFC converter |
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Effective date of registration: 20230627 Address after: 610000 No. 912, floor 9, building 1, No. 489, Guanghua East Third Road, Qingyang District, Chengdu, Sichuan Patentee after: Jieyoute Technology Chengdu Co.,Ltd. Address before: 610039 Xihua University, Hongguang Town, Pidu District, Chengdu City, Sichuan Province Patentee before: XIHUA University |
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