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CN202034903U - Soft switching pressure rising direct current to direct current (DC-DC) convertor - Google Patents

Soft switching pressure rising direct current to direct current (DC-DC) convertor Download PDF

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Publication number
CN202034903U
CN202034903U CN2011201166006U CN201120116600U CN202034903U CN 202034903 U CN202034903 U CN 202034903U CN 2011201166006 U CN2011201166006 U CN 2011201166006U CN 201120116600 U CN201120116600 U CN 201120116600U CN 202034903 U CN202034903 U CN 202034903U
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diode
switching device
power
converter
capacitor
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卜树坡
曹建东
章雯
钱涛
吴冬燕
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Suzhou Vocational Institute of Industrial Technology
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Suzhou Vocational Institute of Industrial Technology
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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

本实用新型揭示了一种软开关升压型DC-DC变换器，其组成包括滤波电容C1、C2、C3，滤波电感L1、L2，开关器件S1、S2，二极管D1、D2、D3，直流电压检测电路、驱动电路以及控制器；其中电感L2和电容C2、二极管D2、开关器件S2构成缓冲回路。并在每个采样周期首先开通开关器件S1，利用辅助缓冲回路实现主功率回路开关器件S1的软开关。本实用新型变换器的应用实施，无需在主功率回路额外放置辅助元件，有效降低了系统损耗、体积和成本。

Figure 201120116600

The utility model discloses a soft switch step-up DC-DC converter, which comprises filter capacitors C 1 , C 2 , C 3 , filter inductors L 1 , L 2 , switching devices S 1 , S 2 , diodes D 1. D 2 , D 3 , DC voltage detection circuit, drive circuit and controller; wherein inductance L 2 , capacitor C 2 , diode D 2 , and switching device S 2 form a buffer circuit. In each sampling period, the switching device S 1 is first turned on, and the auxiliary buffer circuit is used to realize the soft switching of the switching device S 1 in the main power loop. The application and implementation of the converter of the utility model does not need to place additional auxiliary components in the main power circuit, effectively reducing system loss, volume and cost.

Figure 201120116600

Description

A kind of soft boost switching type DC-DC converter
Technical field
The utility model relates to a kind of soft boost switching type DC-DC converter, belongs to the transformation of electrical energy field.
Background technology
The booster type DC-DC converter adopts the high frequency chopping technology, and lower direct voltage is risen to higher direct voltage, has obtained extensive use in fuel cell, photovoltaic generating system.But traditional circuit adopts the working method of hard switching, in the turn-on and turn-off process of device for power switching and power diode, produce bigger switching loss, because switching frequency is very high, cause system effectiveness to descend, be unfavorable for reducing the wastage, volume and cost.
The soft switch technique of Ti Chuing promptly by additional active or passive buffer circuit, made device for power switching and power diode conducting or shutoff when no-voltage, zero current of main circuit in recent years, and then reduced switching loss, improved system effectiveness.A kind of principle of existing scheme is that an additional auxiliary circuit realizes that the no-voltage of main switch is open-minded on main circuit as shown in Figure 1.This scheme can not realize the soft switch of the device for power switching in the auxiliary circuit, and at main loop of power circuit series resonance inductance, cause loss to strengthen, the capacity of resonant inductance is also consistent with the filter inductance of major loop, causes therefore that its efficient is low, cost and volume all increase to some extent.Patent " soft-switching process of DC converter power switch pipe and soft switch DC converter (Granted publication CN1123962C) " discloses a kind of soft switch solution (as shown in Figure 2), its principle is to increase auxiliary power switching tube, resonant capacitance, resonant inductance on the basis of DC converter, three and master power switch pipe S constitute resonant tank, diode of reverse parallel connection respectively on main and auxiliary power switch pipe, and on the master power switch pipe charge and discharge capacitance in parallel.The characteristic of utilizing the resonance characteristic of above-mentioned resonant tank, characteristic that the resonant inductance electric current can not suddenly change and charge and discharge capacitance voltage not to suddenly change, and control main and auxiliary assist rate switching tube by pulse-width modulation circuit and periodically turn on and off, realize that the zero-voltage current of switching tube is opened, no-voltage is closed.The zero current of auxiliary power switching tube is opened, no-voltage is closed, and the no-voltage of rectifier diode pass, and then has effectively improved system effectiveness.But there is the problem of series resonance inductance in the loop of power circuit equally in this scheme, and its additional device that needs is more simultaneously, and above-mentioned factor causes its inferior position aspect volume and cost.
The utility model content
Defective in view of above-mentioned prior art existence, the purpose of this utility model is to propose a kind of soft boost switching type DC-DC converter, to solve big, the additional problem that the soft switch circuit volume is big, cost is high of switching loss of the main switching device that existing DC-DC converter exists.
The utility model above-mentioned purpose, a kind of soft boost switching type DC-DC converter is characterized in that: the structure of described converter is formed and is comprised capacitor C 1, C 2, C 3, filter inductance L 1, L 2, switching device S 1, S 2, diode D 1, D 2, D 3, direct voltage testing circuit, drive circuit and controller;
Its syndeton is: the filter capacitor C of converter input 1Be in parallel with the DC power supply positive and negative electrode; Filter inductance L 1An end and dc power anode, C 1An end and switching device S 2Power take-off link to each other; Filter inductance L 1The other end and diode D 1Positive pole, diode D 3Positive pole and switching device S 1The power input link to each other; Diode D 1Negative pole and the output head anode and the filter capacitor C of converter 3An end link to each other; Diode D 3Negative pole and capacitor C 2An end, inductance L 2An end link to each other; Inductance L 2The other end and diode D 2Positive pole link to each other diode D 2Negative pole and switching device S 2The power input link to each other; The dc power cathode of converter input and the power cathode of output and capacitor C 2The other end, switching device S 1Power take-off and capacitor C 3The other end link to each other; The input of direct voltage testing circuit connects capacitor C 3Two ends, and the output of direct voltage testing circuit connects the analog quantity input interface of controller, the output of controller connects drive circuit, an output of drive circuit
Figure BSA00000477300200021
Connect switching device S 1Signal end, another output
Figure BSA00000477300200022
Connect switching device S 2Signal end.
Further, above-mentioned switching device S 1, S 2Be full control property power device, diode D 1, D 2, D 3Be the fast recovery type power diode.
The application implementation of the soft boost switching type of the utility model DC-DC converter, its outstanding effect is:
By in original DC-DC converter, introducing soft switch circuit, realized no-voltage, the zero current operation of main switching device in switching process, effectively reduced power loss, reduced heating, improved system effectiveness, can improve operate power, improve its integrated level, this programme need not in main loop of power circuit series resonance device or additional switch circuit simultaneously, and the supplementary load loss of corresponding introducing are also little.
Following constipation closes the embodiment accompanying drawing, embodiment of the present utility model is described in further detail, so that technical solutions of the utility model are easier to understand, grasp.
Description of drawings
Fig. 1 is the schematic diagram of a kind of converter of prior art;
Fig. 2 is the schematic diagram of the another kind of converter of prior art;
Fig. 3 is the schematic diagram of the utility model converter;
Fig. 4 is the principle schematic of direct voltage testing circuit;
Fig. 5 is the principle schematic of drive circuit;
Fig. 6 is the principle schematic of controller;
Fig. 7 is the utility model converter is realized control in a sampling period a schematic flow sheet;
Fig. 8 is the work wave schematic diagram of the utility model converter in a sampling period.
Embodiment
Realize the schematic flow sheet of control and the work wave schematic diagram in sampling period to converter principle figure shown in Figure 8, the sampling period below in conjunction with Fig. 3, further specify a kind of soft boost switching type DC-DC converter of the present utility model and control method thereof.Fig. 3 is the structural representation of the utility model embodiment, and its composition comprises filter capacitor C 1, C 2, C 3, filter inductance L 1, L 2, switching device S 1, S 2, diode D 1, D 2, D 3, direct voltage testing circuit, drive circuit and controller;
The filter capacitor C of converter input 1, be in parallel with the DC power supply positive and negative electrode of input; Filter inductance L 1An end and dc power anode, the C of converter input 1An end and switching device S 2Power take-off link to each other filter inductance L 1The other end and diode D 1Positive pole, diode D 3Positive pole and switching device S 1The power input link to each other; Diode D 1Negative pole and the output and the filter capacitor C of converter 3An end link to each other; Diode D 3Negative pole and capacitor C 2An end, inductance L 2An end link to each other; Inductance L 2The other end and diode D 2Positive pole link to each other diode D 2Negative pole and switching device S 2The power input link to each other; The dc power cathode of converter input and the power cathode of output and capacitor C 2The other end, switching device S 1Power take-off and capacitor C 3The other end link to each other; The input of direct voltage testing circuit connects capacitor C 3Two ends, be used to detect the output voltage of converter, the output of direct voltage testing circuit connects the analog quantity input interface of controller, the output of controller connects drive circuit, an output of drive circuit
Figure BSA00000477300200031
Connect switching device S 1Signal end, another output
Figure BSA00000477300200032
Connect switching device S 2Signal end, be respectively applied for control switch device S 1And S 2Conducting and shutoff.
Wherein, inductance L 1Be the filter inductance and the diode D of loop of power circuit 1, switching device S 1, capacitor C 3Constitute DC booster converter.Inductance L 2Be the filter inductance of auxiliary buffer circuit, and capacitor C 2, diode D 2, switching device S 2Constitute buffer loop.Diode D 3Be used to prevent switching device S 1Capacitor C during conducting 2The both positive and negative polarity short circuit.Switching device S wherein 1, S 2Be full control property power device, diode D 1, D 2, D 3Be the fast recovery type power diode.
In addition, wherein the direct voltage testing circuit is composed in series by resistance R DC1 and resistance R DC2, as shown in Figure 4.The end of RDC1 links to each other with the positive pole of dc voltage output end (being the positive source of converter output terminal), the other end links to each other with the end of RDC2 and the input of controller, and the other end of RDC2 links to each other with the negative pole of dc voltage output end (being the power cathode of converter output terminal).This direct voltage testing circuit is a principle of utilizing resistance series connection dividing potential drop, direct voltage is converted to the weak electric signal that is directly proportional with it.
Drive circuit comprises circuit 1 and circuit 2, and as shown in Figure 5, circuit 1 is used for driving switch pipe S1, and circuit 2 is used for driving switch pipe S2; Circuit 1 adopts chip for driving 1, and its model is IR2110, and the input of chip for driving 1 (12 pin) links to each other with first output of controller, and the output of chip for driving 1 (1 pin) links to each other with the signal end of switching tube S1; Circuit 2 adopts chip for driving 2, and its model is IR2110, and the input of chip for driving 2 (12 pin) links to each other with second output of controller, and the output of chip for driving 2 (1 pin) links to each other with the signal end of switching tube S2.
Controller comprises single-chip microcomputer 1 and peripheral circuit, and its schematic diagram as shown in Figure 6.One of model is optional is the single-chip microcomputer 30F2010 of PIC company.Peripheral circuit comprises clock circuit and reset circuit.Clock circuit is used to single-chip microcomputer that clock signal is provided, and comprises crystal oscillator X1 and capacitor C X1, CX2.The power supply ground of the end of capacitor C X1 and the end of CX2 and controller links to each other, the other end of capacitor C X1 links to each other with the end of crystal oscillator X1 and first input end of clock of single-chip microcomputer 1, and the other end of capacitor C X2 links to each other with the other end of crystal oscillator X1 and the second clock input of single-chip microcomputer 1.Reset circuit is used to single-chip microcomputer 1 that reset signal is provided when powering on, comprise resistance R S1 and capacitor C S1, the end of resistance R S1 links to each other with the positive source of controller, the other end of resistance R S1 links to each other with the end of capacitor C S1 and the reset signal input of single-chip microcomputer 1, and the other end of capacitor C S1 links to each other with the power supply ground of controller.
The control method of above-mentioned soft boost switching type DC-DC converter, its control flow is provided with the sampling period as shown in Figure 7, in each sampling period, comprises the steps:
I, at first open switching device S 2
II, setting-up time t 1, at S 2ON time equal t 1The time, open switching device S 1
III, in controller, the output voltage reference value of converter is set, gather the output signal of direct voltage testing circuit, through the AD conversion, obtain and the proportional digital quantity signal of converter output voltage, the output voltage reference value with converter deducts and the proportional digital quantity signal of converter output voltage again, after its result regulates through ratio-integration, multiply by the sampling period value again, obtain switching device S 1Service time;
IV, at switching device S 1Service time and during the coming to the same thing of step 3, stopcock device S 1And S 2
When each follow-up sampling period arrived, repeating step I was to step IV.
Make a concrete analysis of the course of work in a sampling period below.Be divided into four processes, Fig. 8 has provided the work wave schematic diagram of the utility model proposed scheme.First process in each zero hour in sampling period, is at first opened switching device S 2, corresponding drive signal
Figure BSA00000477300200051
Become high level, owing to capacitor C this moment 2The voltage at two ends is higher than input supply voltage, capacitor C 2Will be through inductance L 2, diode D 2, switching device S 2Capacitor C to input side 1Reverse charging, along with time lengthening, reverse current i 2Reduce until zero gradually, this section period corresponds to t 1Second process opened switching device S 1, corresponding drive signal
Figure BSA00000477300200052
Become high level, the DC power supply of input side, inductance L 1With switching device S 1Constitute the loop, produce current i 1Flow through switching device S 1Current i 1Because inductance L 1Existence, increase gradually by zero, realize switching device S 1Zero current turning-on, corresponding S 1ON time be the time t of direct voltage closed-loop regulator output OnThe 3rd process flows through inductance L 1With switching device S 1Current i 1Continue to increase; The 4th process is at S 1ON time equal t OnThe time, stopcock device S 1, corresponding drive signal
Figure BSA00000477300200053
Become low level, flow through inductance L 1An electric current part through diode D 3Be capacitor C 2Charging, switching device S 1The voltage at two ends
Figure BSA00000477300200054
Raise gradually, can be similar to open and do the no-voltage shutoff, effectively reduce the change in voltage stress of turn off process, reduced turn-off power loss, this section period corresponds to t 2Last process is a capacitor C 3Charging process, time corresponding is t remaining time in this sampling period Off, flow through inductance L 1Electric current another part through diode D 1Capacitor C for outlet side 3Charging realizes boosting control, simultaneously, and stopcock device S 2, corresponding drive signal
Figure BSA00000477300200055
Become low level, owing to flow through switching device S this moment 2Electric current be zero, therefore realized switching device S 2Zero-current switching.
As seen from the figure, in the switching process of primary power switch device, realized no-voltage, zero current work, and then improved system effectiveness.And this programme need not series resonance device in major loop, it is lower that the capacity of the device of all auxiliary soft switch circuits can select, greatly reduce loss, volume and the cost of auxiliary soft switch circuit like this, and then improved system effectiveness, and help the highly integrated and high power density design of system, make it be adapted to strict more application scenario.

Claims (2)

1. soft boost switching type DC-DC converter is characterized in that: the structure of described converter is formed and is comprised capacitor C 1, C 2, C 3, filter inductance L 1, L 2, switching device S 1, S 2, diode D 1, D 2, D 3, direct voltage testing circuit, drive circuit and controller;
Its syndeton is: the filter capacitor C of converter input 1Be in parallel with the DC power supply positive and negative electrode; Filter inductance L 1An end and dc power anode, C 1An end and switching device S 2Power take-off link to each other; Filter inductance L 1The other end and diode D 1Positive pole, diode D 3Positive pole and switching device S 1The power input link to each other; Diode D 1Negative pole and the output head anode and the filter capacitor C of converter 3An end link to each other; Diode D 3Negative pole and capacitor C 2An end, inductance L 2An end link to each other; Inductance L 2The other end and diode D 2Positive pole link to each other diode D 2Negative pole and switching device S 2The power input link to each other; The dc power cathode of converter input and the power cathode of output and capacitor C 2The other end, switching device S 1Power take-off and capacitor C 3The other end link to each other; The input of direct voltage testing circuit connects capacitor C 3Two ends, and the output of direct voltage testing circuit connects the analog quantity input interface of controller, the output of controller connects drive circuit, an output of drive circuit
Figure FSA00000477300100011
Connect switching device S 1Signal end, another output Connect switching device S 2Signal end.
2. a kind of soft boost switching type DC-DC converter according to claim 1 is characterized in that: switching device S 1, S 2Be full control property power device, diode D 1, D 2, D 3Be the fast recovery type power diode.
CN2011201166006U 2011-04-19 2011-04-19 Soft switching pressure rising direct current to direct current (DC-DC) convertor Expired - Fee Related CN202034903U (en)

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