CN203326889U - Chained large power step down DC converter - Google Patents

Chained large power step down DC converter Download PDF

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Publication number
CN203326889U
CN203326889U CN2013202746455U CN201320274645U CN203326889U CN 203326889 U CN203326889 U CN 203326889U CN 2013202746455 U CN2013202746455 U CN 2013202746455U CN 201320274645 U CN201320274645 U CN 201320274645U CN 203326889 U CN203326889 U CN 203326889U
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output
power
transformer
converter
recovery diode
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CN2013202746455U
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刘建华
高海燕
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Aerospace Changfeng Chaoyang Power Supply Co Ltd
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Aerospace Changfeng Chaoyang Power Supply Co Ltd
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Abstract

The utility model relates to a chained large power step down DC converter. The chained large power step down DC converter comprises a voltage input end, a voltage output end, an energy storage inductor L and an output capacitor C. The circuit of the DC converter also comprises a first power switch MOS transistor Q1, a second power switch MOS transistor Q2, a no-coupling high frequency chained step down transformer B, a first output quick recovery diode D1 and a second output quick recovery diode D2, wherein the voltage input end is connected with the no-coupling high frequency chained step down transformer B, the no-coupling high frequency chained step down transformer B is connected with the first power switch MOS transistor Q1, the second power switch MOS transistor Q2, the first output quick recovery diode D1 and the second output quick recovery diode D2, and the energy storage inductor L is connected with the first output quick recovery diode D1, the second output quick recovery diode D2 and the output capacitor C. According to the utility model, and under the same power and electrical parameters, the size of a step down power supply is reduced by 50%, the output power is increased by 100%, the efficiency is improved by 10%, and the highest transmission efficiency can reach 96%.

Description

The high-power step down DC converter of a kind of chain type
Technical field
The utility model belongs to electric and electronic power converter technique field, is specifically related to the high-power step down DC converter of a kind of chain type
Background technology
At present both at home and abroad the circuit of step-down switching power supply is commonly used BOOST reduction voltage circuit and the reduction voltage circuit topology based on flyback etc.
The main circuit diagram of BOOST reduction voltage circuit as shown in Figure 1, operation principle is: input power passes to output capacitance (C) by energy storage inductor (L) energy storage and with the input voltage stack by the fast isolating diode (D) that recovers by the break-make of power switch pipe (Q), completes the step-down process.
Based on flyback buck topology main circuit diagram as shown in Figure 2, when switching tube (Q) conducting, the primary coil energy storage of transformer B, when switching tube ends, primary energy is coupled to secondary through high frequency transformer again, by the design of the primary and secondary turn ratio, realizes the step-down process.High frequency transformer has energy loss in the primary and secondary coupling process, can reduce overall efficiency.
That BOOST reduction voltage circuit or flyback topology reduction voltage circuit are all the circuit structures of single power tube, even if can adopt the form of branched power tube parallel connection, but the factor differences such as ptc characteristics due to the current-sharing between power tube in parallel and power tube self, be difficult in actual use expand power, therefore these two kinds of common maximums of circuit can only be exported the power of several hectowatts, are difficult to the demand of satisfying the market to high-power voltage dropping power supply.
Both by carrying out again the energy transmission after the primary inductance energy storage, the restriction of the aspects such as magnetic material and permeability at present, make the magnetic material size of energy storage inductor and flyback transformer larger, magnetic material utilance is lower, overall power density is lower, and it is saturated and cause the circuit damaged condition that product is prone to the magnetic material when the limit is applied.
The utility model content
For above-mentioned deficiency of the prior art, the purpose of this utility model is to provide the high-power step down DC converter of a kind of chain type and control method thereof, the drawback low with the power output that solves traditional buck DC converter, that volume large, fault mode endangers load.
In order to realize above-mentioned utility model purpose, the application provides following technical scheme:
The high-power step down DC converter of a kind of chain type, comprise voltage input end, voltage output end, energy storage inductor L, output capacitance C, described circuit also comprises the first power switch metal-oxide-semiconductor Q1, the second power switch metal-oxide-semiconductor Q2, without coupling high frequency chain type step-down transformer B, the first output fast recovery diode D1, the second output fast recovery diode D2, wherein, voltage input end is connected with nothing coupling high frequency chain type step-down transformer B, without coupling high frequency chain type step-down transformer B and the first power switch metal-oxide-semiconductor Q1, the second power switch metal-oxide-semiconductor Q2, the first output fast recovery diode D1 is connected with the second output fast recovery diode D2, energy storage inductor L and the first output fast recovery diode D1, the second output fast recovery diode D2 is connected with output capacitance C.
Wherein, the two-tube Drive Structure of the high-power output of described converter using, every switching tube duty ratio is 0-50%.
Wherein, the described winding mode that adopts Double-wire parallel wound or tap output without coupling high frequency chain type step-down transformer B, magnetic core is without air gap.
Wherein, with the first metal-oxide-semiconductor P1, substitute the first power switch metal-oxide-semiconductor Q1, the second metal-oxide-semiconductor P2 substitutes the second power switch metal-oxide-semiconductor Q2.
Wherein, the circuit main control chip adopts TL494, and described TL494 operating frequency is set as 280KHz, and described transformer B selects the EE55 magnetic core, and described Q1, Q2 select IPP05CN10L, and described D1, D2 select MUR3020.
A kind of control method of converter, the input power anode, from a pin input without coupling high frequency chain type step-down transformer B, flows back to the input negative terminal through Q1, Q2 respectively by b, c pin; The input power anode is from a pin input without coupling high frequency chain type step-down transformer B, by after d, the step-down of e pin respectively through D1, D2 rectification, L, C filtering, then flow back to successively the negative terminal of input through output loading anode, negative terminal.
Wherein, when the Q1 conducting, the Q2 cut-off, the high frequency transformer sense of current is by a to b, and the D2 conducting, for L, C energy storage filtering, provide output voltage, output voltage=K * D * Vin, due to turn ratio K>1, so output voltage is high than input voltage.
Wherein, when the Q1 cut-off, the Q2 conducting, the high frequency transformer sense of current is by a to c, and the D1 conducting, for L, C energy storage filtering, provide output voltage.
Wherein, for fear of Q1, Q2 conducting simultaneously, cause input " short circuit ", in Q1, Q2 alternate conduction, in interval, be provided with Dead Time, Q1, Q2 end in the Dead Time domestic demand simultaneously.
Wherein, high frequency transformer is with conducting and the staggered driving of the cut-off bipolarity magnetic polarization work of Q1, Q2, for output provides the step-down voltage value.
" the high-power decompression DC converter technique of chain type " created the brand-new circuit topology of " the staggered power drive that increases each other ", " without coupling high frequency chain type step-down transformer ".The theory diagram of " the high-power decompression DC converter technique of chain type " is as Fig. 3.
In this topological schematic diagram, " the staggered power drive that increases each other " set up the two-tube Drive Structure of high-power output, interlock every the switching tube duty ratio of mode of conducting of take is 0-50%, and this circuit topological structure, make power output promote one times than the power output of single-tube circuit topology.
" without coupling high frequency chain type step-down transformer " broken through traditional design, and according to electromagnetic induction principle, directly traditional two coil heights of primary and secondary are integrated into a step-down energy " chain " with symmetrical structure at present.Step-down " chain " formula high frequency transformer characteristics are to have saved one group of coil, integrated and shared primary coil, can to greatest extent prime power be passed to after step-down to output." without coupling high frequency chain type step-down transformer " changed current traditional high frequency transformer needs the primary and secondary coupling to carry out energy exchange.Through design with great concentration for many years, produce and compare, should the integrated high frequency transformer of " chain " formula, its efficiency of transmission at home and abroad in the high frequency transformer field for the highest, and saved coil copper cash used, reduce volume and the materials of magnetic material.
Beneficial effect
Present technique has realized that voltage dropping power supply is under the requirement of equal-wattage and electric parameter, and volume reduces 50%, and power output has increased by one times, and efficiency improves 10%, most effectively can reach 96%, and fault mode can not make the load overvoltage.
Fig. 4 a-Fig. 4 c is single tube and the contrast of the two-tube course of work, as can be seen from Figure, two-tube driving, i.e. two staggered work of power tubes, the duty ratio of every power tube is nearly 50%, and power can promote one times.The model machine of developing, its separate unit power output easily realizes 1.5KW, the output parameters meets the requirement of " performance characteristics of GB/T 17478-2004 DC power supply device ".
Output electric property can be excellent:
Through calculation and test checking repeatedly, the design of two-tube staggered driving makes the circuit output voltage waveform can full symmetric in the circuit working process, under the same frequency state, the output transient response speed is high, and the output voltage after step-down and current regulation all are less than 0.5%.
High power density:
Two-tube staggered driving makes high frequency transformer magnetic core in the III operating state, high frequency transformer belongs to the bipolarity magnetic polarization, the magnetic induction excursion is more than the twice of unipolarity magnetic polarization, and the magnetic core utilance is high, and core volume only needs half of the circuit magnetic cores used such as above-mentioned flyback.
" without coupling high frequency chain type step-down transformer " improved conversion efficiency:
Structure that high frequency transformer is designed to non-coupling " chain type ", eliminate the loss of power of coupling process between the primary and secondary of current conventional topological structure high frequency transformer, improved the conversion efficiency of transformer, and efficiency improves 10%, most effectively can reach 96%.High frequency transformer is this without coupling " chain type " structure simultaneously, according to electromagnetic induction principle, average voltage is distributed in winding inside, eliminated thoroughly the unfavorable factor of coupling, realized that power rows has for input and output the decompression DC converting power source that " greatly no-load voltage ratio " requires in the industry, still there is very high efficiency ideal, energy savings.
" without coupling high frequency chain type step-down transformer " production technology is easily controlled:
" the high-power decompression DC converter technique of chain type " designs succinct, novel, and directly traditional two coils of primary and secondary integrate at present, make transformer winding easier.
The technique for coiling complexity of current conventional topological structure high frequency transformer, in order to increase the coupling between coil, have to adopt complicated " sandwich " winding usually, and the coil utilance reduces, and the technology controlling and process consistency is poor.
Non-coupling " chain type " structure, fully by the turn ratio of high frequency transformer, input voltage is increased to desirable value, when winded coil of transformer, need the wire winding of " Double-wire parallel wound " and " tap output " to get final product, and magnetic core does not need out air gap, production technology is more easily controlled, and Fig. 5 is high frequency transformer coiling comparison chart.
The utility model at home and abroad field of switch power has been created a kind of brand-new circuit topology, has solved traditional drawback that buck DC converter power output is low, volume is large, efficiency is low, reliability is low.
The power output, output electric property that has promoted reduction voltage circuit can be excellent, have high power density, " without coupling high frequency chain type step-down transformer " improved conversion efficiency, production technology is easily controlled.
Present technique has realized that voltage dropping power supply is under the requirement of equal-wattage and electric parameter, and volume reduces 50%, and efficiency improves 10%, most effectively can reach 96%.These utility model market prospects are wide, mainly comprise vehicle-mounted decompression transformation, laser powered sensor power supply, electrostatic precipitation, LED illumination, solar energy power generating, field of wind power generation.
The accompanying drawing explanation
Fig. 1 BOOST reduction voltage circuit;
Fig. 2 flyback reduction voltage circuit;
Fig. 3 " the high-power decompression DC converter technique of chain type " circuit diagram;
Fig. 4 a BOOST single tube work schematic diagram;
Fig. 4 b forward converter single tube work schematic diagram;
The two-tube work schematic diagram of Fig. 4 c chain type reduction voltage circuit;
Fig. 5 high frequency transformer coiling comparison chart;
Fig. 6 " the high-power decompression DC converter technique of chain type " extends topological diagram;
Fig. 7 " the high-power decompression DC converter technique of chain type " DC24V step-down DC12V example schematic diagram.
Embodiment
Embodiment 1
To export the rectification diode and be expanded into the secondary synchronization rectification circuit with metal-oxide-semiconductor on the technical program basis, Fig. 6 is shown in by winding diagram, and in figure, P1, P2 are metal-oxide-semiconductor, substituted original rectifying tube D1, D2, realizes synchronous rectification.
Application in vehicle-mounted decompression transformation field:
Vehicle-mounted power supply is generally DC12V, a lot of powerful electronic equipments need to provide the voltage of DC24V, its power output of original circuit form is 0-600W, but adopt " the high-power decompression DC converter technique of chain type " power output can be promoted to 3000W, and volume is little, lightweight, be more suitable in vehicle-mounted environment for use.
The topological form of circuit adopts " the high-power decompression DC converter technique of chain type ", and the circuit main control chip adopts TL494, and main transformer B has selected the EE55 magnetic core, and Q1, Q2 select IPP05CN10L, and D1, D2 select MUR3020.The TL494 operating frequency is set as to 280KHz, and main transformer B adopts Double-wire parallel wound tap lead-out mode as shown in Figure 5, and power output is 2000W, and efficiency by inputoutput test is 95.8%.

Claims (5)

1. the high-power step down DC converter of chain type, comprise voltage input end, voltage output end, energy storage inductor L, output capacitance C, it is characterized in that: described circuit also comprises the first power switch metal-oxide-semiconductor Q1, the second power switch metal-oxide-semiconductor Q2, without coupling high frequency chain type step-down transformer B, the first output fast recovery diode D1, the second output fast recovery diode D2, wherein, voltage input end is connected with nothing coupling high frequency chain type step-down transformer B, without coupling high frequency chain type step-down transformer B and the first power switch metal-oxide-semiconductor Q1, the second power switch metal-oxide-semiconductor Q2, the first output fast recovery diode D1 is connected with the second output fast recovery diode D2, energy storage inductor L and the first output fast recovery diode D1, the second output fast recovery diode D2 is connected with output capacitance C.
2. converter according to claim 1, it is characterized in that: the two-tube Drive Structure of the high-power output of described converter using, every switching tube duty ratio is 0-50%.
3. converter according to claim 1 is characterized in that: the described winding mode that adopts Double-wire parallel wound or tap output without coupling high frequency chain type step-down transformer B, magnetic core is without air gap.
4. converter according to claim 1 is characterized in that: substitute the first power switch metal-oxide-semiconductor Q1 with the first metal-oxide-semiconductor P1, the second metal-oxide-semiconductor P2 substitutes the second power switch metal-oxide-semiconductor Q2.
5. according to the described converter of claim 1-3 any one claim, it is characterized in that: the circuit main control chip adopts TL494, described TL494 operating frequency is set as 280KHz, described transformer B selects the EE55 magnetic core, described Q1, Q2 select IPP05CN10L, and described D1, D2 select MUR3020.
CN2013202746455U 2013-05-20 2013-05-20 Chained large power step down DC converter Active CN203326889U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103259410A (en) * 2013-05-20 2013-08-21 航天长峰朝阳电源有限公司 Chain type high-power voltage-reducing direct-current converter and control method thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103259410A (en) * 2013-05-20 2013-08-21 航天长峰朝阳电源有限公司 Chain type high-power voltage-reducing direct-current converter and control method thereof
CN103259410B (en) * 2013-05-20 2015-11-04 航天长峰朝阳电源有限公司 A kind of chain type high-power step down DC converter and control method thereof

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