CN202455266U - Buck-Boost voltage-regulating voltage balance converter - Google Patents

Buck-Boost voltage-regulating voltage balance converter Download PDF

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Publication number
CN202455266U
CN202455266U CN2012200800516U CN201220080051U CN202455266U CN 202455266 U CN202455266 U CN 202455266U CN 2012200800516 U CN2012200800516 U CN 2012200800516U CN 201220080051 U CN201220080051 U CN 201220080051U CN 202455266 U CN202455266 U CN 202455266U
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voltage
power
power switch
diode
switch pipe
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Expired - Fee Related
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CN2012200800516U
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Chinese (zh)
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郑欢
江道灼
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Zhejiang University ZJU
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Zhejiang University ZJU
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Abstract

The utility model discloses a Buck-Boost voltage-regulating voltage balance converter. In the conventional converter, the output direct-current voltage is unstable when the input direct-current voltage fluctuates greatly. The Buck-Boost voltage-regulating voltage balance converter comprises an input voltage source, a voltage-regulating switch circuit, a voltage balance circuit, a first state selection circuit and a second state selection circuit, wherein a first power switch tube S1 is connected in parallel with a diode D1; a second power switch tube S2 is connected with in parallel with a diode D2; a third power switch tube S3 is connected in parallel with a diode D3, a fourth power switch tube S4 is connected with in parallel with a diode D4; a fifth power switch tube S5 is connected in parallel with a diode D5, a sixth diode D6 and a second inductor L2; and a sixth power switch tube S6 is connected in parallel with a diode D7, an eighth diode D8, a ninth diode D9 and a third inductor L3. Due to the adoption of the Buck-Boost voltage-regulating voltage balance converter, voltages at the two ends of a direct-current dividing capacitor can still be kept equal when loads on the two poles of a direct-current power distribution network are unbalanced, and the output direct-current voltage is stable when the input direct-current voltage fluctuates greatly.

Description

A kind of Buck-Boost pressure-adjusting type voltage balance converter
Technical field
The utility model belongs to the power electronics application, relates in particular to a kind of Buck-Boost pressure-adjusting type voltage balance converter.
Background technology
Tremendous development and extensive use along with new forms of energy, new material, information technology and power electronic technology; And the user is to the improving constantly of requirements such as need for electricity, the quality of power supply and power supply reliability, and will obtain increasing concern based on the power distribution network of direct current.In the DC distribution net, adopt two ac line electric energy transmittings (being one pole DC distribution net) often can't satisfy the requirement of various power inverters and power consumption equipment to input voltage.For example for output voltage identical half-bridge inverter and full-bridge inverter, the input voltage of half-bridge inverter is about the twice of full-bridge inverter, inserts the comparatively inconvenience of one pole DC distribution net simultaneously; The household lighting circuit required voltage is lower, and the required input voltage of household electrical appliance such as refrigerator, air-conditioning is then higher relatively, and one pole DC distribution net also can't satisfy the requirement of various power consumption equipments to input voltage simultaneously.Therefore; Insert the DC distribution net for the ease of various power inverters and power consumption equipment; Improve the application flexibility of DC distribution net; Solve all pressures problem of dc capacitor simultaneously, must design independently voltage balance converter, convert two ac line distribution systems (one pole DC distribution net) into three line distribution systems (bipolar DC power distribution network).
Summary of the invention
The purpose of the utility model is the deficiency to prior art, and a kind of Buck-Boost pressure-adjusting type voltage balance converter is provided.
The utility model comprises input voltage source, pressure regulating on-off circuit, voltage balancing circuit, first state selecting circuit, second state selecting circuit.
Pressure regulating on-off circuit comprises first power switch pipe S 1, first power diode D 1, second power switch pipe S 2, second power diode D 2First power switch pipe S 1The collector electrode and first power diode D 1Second inductance in negative electrode, first state selecting circuit L 2One end is connected, first power switch pipe S 1The emitter and first power diode D 1Anode, second power switch pipe S 2Collector electrode, second power diode D 2The 3rd inductance in negative electrode, second state selecting circuit L 3One end is connected, second power switch pipe S 2The emitter and second power diode D 2Anode, input voltage source negative pole are connected.
First state selecting circuit comprises the 5th power switch pipe S 5, the 5th power diode D 5, the 6th power diode D 6, second inductance L 2.The 5th power switch pipe S 5Collector electrode and the 5th power diode D 5Negative electrode, second inductance L 2The other end, input voltage source positive pole are connected; The 5th power switch pipe S 5Emitter and the 5th power diode D 5Anode, the 6th power diode D 6Anode is connected; The 6th power diode D 6The negative electrode and second inductance L 2First power diode in one end, the pressure regulating on-off circuit D 1Negative electrode is connected.
Second state selecting circuit comprises the 6th power switch pipe S 6, the 7th power diode D 7, the 8th power diode D 8, the 9th power diode D 9, the 3rd inductance L 3The 6th power switch pipe S 6Collector electrode and the 7th power diode D 7Negative electrode, the 3rd inductance L 3One end is connected, the 6th power switch pipe S 6Emitter and the 7th power diode D 7Anode, the 8th power diode D 8Anode is connected, the 8th power diode D 8Negative electrode and the 3rd inductance L 3The other end, the 9th power diode D 9Anode is connected, the 9th power diode D 9The 3rd power diode in negative electrode and the voltage balancing circuit D 3Negative electrode is connected.
Voltage balancing circuit comprises the 3rd power switch pipe S 3, the 3rd power diode D 3, the 4th power switch pipe S 4, the 4th power diode D 4, first inductance L 1, first electric capacity C 1, second electric capacity C 2.The 3rd power switch pipe S 3Collector electrode and the 3rd power diode D 3Negative electrode, first electric capacity C 1One end is connected, the 3rd power switch pipe S 3Emitter and the 3rd power diode D 3Anode, first inductance L 1One end is connected, the 4th power switch pipe S 4The collector electrode and first inductance L 1One end, the 4th power diode D 4Negative electrode is connected, the 4th power switch pipe S 4Emitter and the 4th power diode D 4Anode, second electric capacity C 2One end, input voltage source negative pole are connected, first inductance L 1The other end and first electric capacity C 1The other end, second electric capacity C 2The other end is connected.
The utility model workflow is following:
To input direct voltage V InSample, with the input direct voltage of sampling acquisition V InAnd DC reference voltage V DcrefDifference △ VWith permission difference △ V RefCompare, the utility model operating state is judged and selected through comparative result:
(1) if △ VAbsolute value less than allowing difference △ V Ref, then judge input direct voltage V InBe in normal range (NR), control first state selecting circuit and second state selecting circuit this moment, converts the circuit structure of the utility model into normal operating conditions, and only the PWM control strategy of voltage balancing circuit employing fixed frequency 20khz guarantees first electric capacity C 1With second electric capacity C 2Voltage equates.
(2) if △ VGreater than △ V Ref, then judge input direct voltage V InBe higher than upper voltage limit, control first state selecting circuit and second state selecting circuit this moment, converts the circuit structure of the utility model into the Buck operating state, and pressure regulating on-off circuit is worked under Buck circuit control strategy, the assurance output dc voltage V InBe in normal range (NR); Voltage balancing circuit adopts the PWM control strategy of fixed frequency 20kHz, guarantees first electric capacity C 1With second electric capacity C 2Voltage equates.
(3) if △ VLess than-△ V Ref, then judge input direct voltage V InBe lower than lower voltage limit, control first state selecting circuit and second state selecting circuit this moment, converts the circuit structure of the utility model into the Boost operating state, and pressure regulating on-off circuit is worked under Boost circuit control strategy, the assurance output dc voltage V InBe in normal range (NR); Voltage balancing circuit adopts the PWM control strategy of fixed frequency 20khz, guarantees first electric capacity C 1With second electric capacity C 2Voltage equates.
Described upper voltage limit is a DC reference voltage V DcrefWith permission difference △ V RefWith;
Described lower voltage limit is a DC reference voltage V DcrefWith permission difference △ V RefPoor.
The beneficial effect of the utility model is: a kind of Buck-Boost pressure-adjusting type voltage balance converter not only can be constructed a stable output neutral voltage; Convert two ac line distribution systems (one pole DC distribution net) of DC distribution net into three line distribution systems (bipolar DC power distribution network), and it is equal under the situation of DC distribution net the two poles of the earth laod unbalance, to keep dc partial voltage electric capacity voltage constantly; Can also be when converter input direct voltage fluctuation; It is stable to keep output dc voltage; The voltage fluctuation of isolated DC power distribution network medium voltage side is to the influence of low-pressure side voltage, and control principle is simply effective, has improved the application flexibility and the operational reliability of DC distribution net.
Description of drawings
Fig. 1 is the circuit diagram of this utility model;
Fig. 2 is this utility model control flow chart;
Fig. 3 is the voltage balancing circuit PWM control principle figure of the utility model;
Fig. 4 is the Buck circuit control principle figure of the utility model Buck operating state;
Fig. 5 is the Boost circuit control principle figure of the utility model Boost operating state;
Fig. 6 is the equivalent circuit diagram of the utility model normal operating conditions;
Fig. 7 is the equivalent circuit diagram of the utility model Buck operating state;
Fig. 8 is the equivalent circuit diagram of the utility model Boost operating state;
Fig. 9 is circuit mode 1 sketch map of the utility model normal operating conditions;
Figure 10 is circuit mode 2 sketch mapes of the utility model normal operating conditions;
Figure 11 is circuit mode 3 sketch mapes of the utility model normal operating conditions;
Figure 12 is circuit mode 4 sketch mapes of the utility model normal operating conditions;
Figure 13 is circuit mode 1 sketch map of the utility model Buck operating state;
Figure 14 is circuit mode 2 sketch mapes of the utility model Buck operating state;
Figure 15 is circuit mode 1 sketch map of the utility model Boost operating state;
Figure 16 is circuit mode 2 sketch mapes of the utility model Boost operating state;
Figure 17 is the utility model artificial circuit figure;
Figure 18 is the main simulation waveform Fig. 1 of the utility model;
Figure 19 is the main simulation waveform Fig. 2 of the utility model.
Embodiment
Below in conjunction with accompanying drawing the utility model is described further.
As shown in Figure 1, the utility model comprises input voltage source, pressure regulating on-off circuit, voltage balancing circuit, first state selecting circuit, second state selecting circuit.
Pressure regulating on-off circuit comprises first power switch pipe S 1, first power diode D 1, second power switch pipe S 2, second power diode D 2First power switch pipe S 1The collector electrode and first power diode D 1Second inductance in negative electrode, first state selecting circuit L 2One end is connected, first power switch pipe S 1The emitter and first power diode D 1Anode, second power switch pipe S 2Collector electrode, second power diode D 2The 3rd inductance in negative electrode, second state selecting circuit L 3One end is connected, second power switch pipe S 2The emitter and second power diode D 2Anode, input voltage source negative pole are connected.
First state selecting circuit comprises the 5th power switch pipe S 5, the 5th power diode D 5, the 6th power diode D 6, second inductance L 2.The 5th power switch pipe S 5Collector electrode and the 5th power diode D 5Negative electrode, second inductance L 2The other end, input voltage source positive pole are connected; The 5th power switch pipe S 5Emitter and the 5th power diode D 5Anode, the 6th power diode D 6Anode is connected; The 6th power diode D 6The negative electrode and second inductance L 2First power diode in one end, the pressure regulating on-off circuit D 1Negative electrode is connected.
Second state selecting circuit comprises the 6th power switch pipe S 6, the 7th power diode D 7, the 8th power diode D 8, the 9th power diode D 9, the 3rd inductance L 3The 6th power switch pipe S 6Collector electrode and the 7th power diode D 7Negative electrode, the 3rd inductance L 3One end is connected, the 6th power switch pipe S 6Emitter and the 7th power diode D 7Anode, the 8th power diode D 8Anode is connected, the 8th power diode D 8Negative electrode and the 3rd inductance L 3The other end, the 9th power diode D 9Anode is connected, the 9th power diode D 9The 3rd power diode in negative electrode and the voltage balancing circuit D 3Negative electrode is connected.
Voltage balancing circuit comprises the 3rd power switch pipe S 3, the 3rd power diode D 3, the 4th power switch pipe S 4, the 4th power diode D 4, first inductance L 1, first electric capacity C 1, second electric capacity C 2.The 3rd power switch pipe S 3Collector electrode and the 3rd power diode D 3Negative electrode, first electric capacity C 1One end is connected, the 3rd power switch pipe S 3Emitter and the 3rd power diode D 3Anode, first inductance L 1One end is connected, the 4th power switch pipe S 4The collector electrode and first inductance L 1One end, the 4th power diode D 4Negative electrode is connected, the 4th power switch pipe S 4Emitter and the 4th power diode D 4Anode, second electric capacity C 2One end, input voltage source negative pole are connected, first inductance L 1The other end and first electric capacity C 1The other end, second electric capacity C 2The other end is connected.
Shown in Fig. 2 ~ 17, control principle, the course of work of utility model described.
As shown in Figure 2, with input direct voltage V InSampled value V In(k) compare with the direct voltage upper limit and lower limit, thereby the operating state that the utility model should be taked is judged and selected.
Normal operating conditions: if V In(k), then judge input direct voltage less than upper voltage limit and greater than lower voltage limit V InBe in normal range (NR), control first power switch pipe this moment S 1, the 5th power switch pipe S 5And the 6th power switch pipe S 6Open-minded, second power switch pipe S 2Turn-off, convert the circuit structure of converter into normal operating conditions, as shown in Figure 6; Get first electric capacity C 1Voltage V C1With second electric capacity C 2Voltage V C2As feedback signal, after the proportion of utilization link was regulated its control sensitivity, input comparator and triangular wave compared, and one road signal directly drives the 3rd power switch pipe in its output signal S 3, another road signal negate rear drive the 4th power switch pipe S 4, as shown in Figure 3.
When first load resistance R L1 Greater than second load resistance R L2 The time, the 3rd power switch pipe S 3ON time greater than the 4th power switch pipe S 4ON time, first electric capacity C 1Through first inductance L 1Transfer portion electric energy to the second electric capacity C 2On, make first electric capacity C 1Voltage V C1With second electric capacity C 2Voltage V C2Equate.This moment, converter had two kinds of circuit mode: as shown in Figure 9, and the 3rd power switch pipe S 3Conducting, the 4th power switch pipe S 4Turn-off the 3rd power diode D 3With the 4th power diode D 4End first electric capacity C 1Portion of energy is through the 3rd power switch pipe S 3To first inductance L 1Shift first inductive current i L1 Linear rising, first electric capacity C 1Voltage V C1Descend; Shown in figure 10, the 3rd power switch pipe S 3With the 4th power switch pipe S 4Turn-off the 3rd power diode D 3End the 4th power diode D 4Conducting, first inductance L 1Middle energy stored is through the 4th power diode D 4To second electric capacity C 2Transmit first inductive current i L1 Linear decline, second electric capacity C 2Voltage V C2Rise.
When first load resistance R L1 Less than second load resistance R L2 The time, control the 3rd power switch pipe S 3ON time less than the 4th power switch pipe S 4ON time, first inductive current i L1 Be negative value, second electric capacity C 2Through first inductance L 1Transfer portion electric energy to the first electric capacity C 1On, make the first electric capacity voltage V C1With the second electric capacity voltage V C2Equate.This moment, converter also had two kinds of circuit mode: shown in figure 11, and the 3rd power switch pipe S 3Turn-off the 4th power switch pipe S 4Conducting, the 3rd power diode D 3With the 4th power diode D 4End second electric capacity C 2Portion of energy is through the 4th power switch pipe S 4To first inductance L 1Shift ,- i L1 Linear rising, second electric capacity C 2Voltage V C2Descend; Shown in figure 12, the 3rd power switch pipe S 3With the 4th power switch pipe S 4Turn-off the 3rd power diode D 3Conducting, the 4th power diode D 4End first inductance L 1Middle energy stored is through the 3rd power diode D 3To second electric capacity C 2Transmit ,- i L1 Linear decline, first electric capacity C 1Voltage V C1Rise.
The Buck operating state: if V In(k), then judge input direct voltage greater than upper voltage limit V InBe higher than the direct voltage upper limit, control the 5th power switch pipe this moment S 5Open-minded, second power switch pipe S 2With the 6th power switch pipe S 6Turn-off, convert the circuit structure of converter into the Buck operating state, as shown in Figure 7; Get the converter output dc voltage V OutAs feedback signal, input comparator and DC reference voltage V DcrefCompare, its output signal directly drives first power switch pipe S 1, as shown in Figure 4; Voltage balancing circuit still adopts the PWM control described in normal operating conditions, and its control principle and the course of work repeat no more at this.
Under the Buck operating state, the utility model has two kinds of circuit mode (voltage balancing circuit is not discussed): shown in figure 13, and first power switch pipe S 1Conducting, second power diode D 2End the 3rd inductive current i L3 Linear rising, output dc voltage V OutRise; Shown in figure 14, first power switch pipe S 1Turn-off second power diode D 2Conducting, the 3rd inductive current i L3 Linear decline, output dc voltage V OutDescend.Along with the variation of load resistance, the Buck circuit is if produce the semiconductor switch DCM, and its principle is no longer described at this.
The Boost operating state: if V In(k), then judge input direct voltage less than lower voltage limit V InBe lower than the direct voltage lower limit, control the 5th power switch pipe this moment S 5Turn-off first power switch pipe S 1With the 6th power switch pipe S 6Open-minded, convert the utility model circuit structure into the Boost operating state, as shown in Figure 8; With output dc voltage V OutAs feedback signal, utilize outer voltage control output dc voltage V OutEqual DC reference voltage V Dcref, the direct input comparator of output signal and second inductive current of outer voltage i L2 Compare the formation current inner loop, the output signal of current inner loop directly drives second power switch pipe S 2, as shown in Figure 5; Voltage balancing circuit still adopts the PWM control described in normal operating conditions.
Under the Boost operating state, the utility model has two kinds of circuit mode (voltage balancing circuit is not discussed): shown in figure 15, and second power switch pipe S 2Conducting, the 9th power diode D 9End second inductive current i L2 Linear rising, output dc voltage V OutDescend; Shown in figure 16, second power switch pipe S 2Turn-off the 9th power diode D 9Conducting, second inductive current i L2 Linear decline, output dc voltage V OutRise.Along with the variation of load resistance, the Boost circuit is if produce the semiconductor switch DCM, and its principle is no longer described at this.
Described upper voltage limit is a DC reference voltage V DcrefWith permission difference △ V RefWith;
Described lower voltage limit is a DC reference voltage V DcrefWith permission difference △ V RefPoor.
Shown in Figure 17 ~ 19, utility model is carried out emulation.
Artificial circuit figure is shown in figure 17, and its simulation parameter is following: sample frequency 20kHz, input direct voltage V InBe the 400V DC power supply, at 250 ~ 400ms stack 40V/50Hz sine ac power supply, first inductance L 1, second inductance L 2, the 3rd inductance L 3Get 50mH, 0.8mH, 0.5mH respectively, first electric capacity C 1, second electric capacity C 2Be respectively 1000 μ F, DC reference voltage V Dcref, direct voltage allows difference △ V RefBe respectively 400V, 8V, first electric capacity C 1Two ends parallel connection first load resistance R L1 , second electric capacity C 2Two ends parallel connection second load resistance R L2
It is shown in figure 18, R L1 =100 Ω, R L2 =10 Ω.Because R L1 > R L2 And differ bigger, therefore first inductive current i L1 Perseverance is on the occasion of, first electric capacity C 1Through first inductance L 1Transfer portion electric energy to the second electric capacity C 2On, make the first electric capacity voltage V C1With the second electric capacity voltage V C2Equate.At input direct voltage V InWhen fluctuation took place, the utility model switched between normal operating conditions, Buck operating state and Boost operating state, second inductance L 2, the 3rd inductance L 3Take turns to operate, make output dc voltage V OutBe stabilized in about 400V, fluctuating range is no more than direct voltage and allows difference △ V RefIn the process of switching in working order, first inductive current i L1 Basically unaffected.
It is shown in figure 19, R L1 =10 Ω, R L2 =100 Ω.Because R L1 < R L2 And differ bigger, therefore first inductive current i L1 Perseverance is a negative value, second electric capacity C 2Through first inductance L 1Transfer portion electric energy to the first electric capacity C 1On, make the first electric capacity voltage V C1With the second electric capacity voltage V C2Equate.At input direct voltage V InWhen fluctuation took place, the utility model switched between normal operating conditions, Buck operating state and Boost operating state, second inductance L 2, the 3rd inductance L 3Take turns to operate, make output dc voltage V OutBe stabilized in about 400V, fluctuating range is no more than direct voltage and allows difference △ V RefIn the process of switching in working order, first inductive current i L1 Basically unaffected.
Figure 18,19 simulation result show; The utility model not only can convert two ac line distribution systems of DC distribution net into three line distribution systems; Keep the stable of output neutral voltage; It is stable under the situation of input direct voltage fluctuation, to keep output dc voltage, and the voltage fluctuation of isolated DC power distribution network medium voltage side is to the influence of low-pressure side voltage.

Claims (1)

1. a Buck-Boost pressure-adjusting type voltage balance converter is characterized in that: comprise input voltage source, pressure regulating on-off circuit, voltage balancing circuit, first state selecting circuit, second state selecting circuit;
Pressure regulating on-off circuit comprises first power switch pipe S 1, first power diode D 1, second power switch pipe S 2, second power diode D 2First power switch pipe S 1The collector electrode and first power diode D 1Second inductance in negative electrode, first state selecting circuit L 2One end is connected, first power switch pipe S 1The emitter and first power diode D 1Anode, second power switch pipe S 2Collector electrode, second power diode D 2The 3rd inductance in negative electrode, second state selecting circuit L 3One end is connected, second power switch pipe S 2The emitter and second power diode D 2Anode, input voltage source negative pole are connected;
First state selecting circuit comprises the 5th power switch pipe S 5, the 5th power diode D 5, the 6th power diode D 6, second inductance L 2;The 5th power switch pipe S 5Collector electrode and the 5th power diode D 5Negative electrode, second inductance L 2The other end, input voltage source positive pole are connected; The 5th power switch pipe S 5Emitter and the 5th power diode D 5Anode, the 6th power diode D 6Anode is connected; The 6th power diode D 6The negative electrode and second inductance L 2First power diode in one end, the pressure regulating on-off circuit D 1Negative electrode is connected;
Second state selecting circuit comprises the 6th power switch pipe S 6, the 7th power diode D 7, the 8th power diode D 8, the 9th power diode D 9, the 3rd inductance L 3The 6th power switch pipe S 6Collector electrode and the 7th power diode D 7Negative electrode, the 3rd inductance L 3One end is connected, the 6th power switch pipe S 6Emitter and the 7th power diode D 7Anode, the 8th power diode D 8Anode is connected, the 8th power diode D 8Negative electrode and the 3rd inductance L 3The other end, the 9th power diode D 9Anode is connected, the 9th power diode D 9The 3rd power diode in negative electrode and the voltage balancing circuit D 3Negative electrode is connected;
Voltage balancing circuit comprises the 3rd power switch pipe S 3, the 3rd power diode D 3, the 4th power switch pipe S 4, the 4th power diode D 4, first inductance L 1, first electric capacity C 1, second electric capacity C 2;The 3rd power switch pipe S 3Collector electrode and the 3rd power diode D 3Negative electrode, first electric capacity C 1One end is connected, the 3rd power switch pipe S 3Emitter and the 3rd power diode D 3Anode, first inductance L 1One end is connected, the 4th power switch pipe S 4The collector electrode and first inductance L 1One end, the 4th power diode D 4Negative electrode is connected, the 4th power switch pipe S 4Emitter and the 4th power diode D 4Anode, second electric capacity C 2One end, input voltage source negative pole are connected, first inductance L 1The other end and first electric capacity C 1The other end, second electric capacity C 2The other end is connected.
CN2012200800516U 2012-03-06 2012-03-06 Buck-Boost voltage-regulating voltage balance converter Expired - Fee Related CN202455266U (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102611302A (en) * 2012-03-06 2012-07-25 浙江大学 Buck-Boost voltage-regulating type voltage balance converter
CN103490632A (en) * 2013-10-10 2014-01-01 淮海工学院 Step-up step-down type output voltage balancing circuit
CN107800295A (en) * 2016-09-07 2018-03-13 国民技术股份有限公司 A kind of type of voltage step-up/down converter and its method of work and terminal device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102611302A (en) * 2012-03-06 2012-07-25 浙江大学 Buck-Boost voltage-regulating type voltage balance converter
CN103490632A (en) * 2013-10-10 2014-01-01 淮海工学院 Step-up step-down type output voltage balancing circuit
CN107800295A (en) * 2016-09-07 2018-03-13 国民技术股份有限公司 A kind of type of voltage step-up/down converter and its method of work and terminal device

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