CN102545628A - Conversion circuit for high-voltage input and low-voltage output - Google Patents
Conversion circuit for high-voltage input and low-voltage output Download PDFInfo
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Abstract
The invention discloses a conversion circuit for high-voltage input and low-voltage output, belonging to the technical field of power electronic technology. The conversion circuit comprises a capacitance divider circuit, a switch circuit, a rectifying circuit and a filter circuit, wherein the output end of the capacitance divider circuit is connected with the input end of the filter circuit through the switch circuit and the rectifying circuit; two ends of the divider circuit and the switch circuit are connected with the anode and the cathode of the power supply, respectively; three step down transformers are connected serially at the preceding stage of the rectifying circuit, two ends of the rectifying circuit are connected with the output end of the switch circuit, and three full-wave rectifiers are connected in parallel at the back stage of the rectifying circuit; the filter circuit is a capacitor filter circuit, and two ends of the filter circuit are connected with two output ends of a rectifier, respectively. The conversion circuit inputs high voltage class, outputs stable direct-current voltage, has a simple circuit structure, small switching stress, simplified transformer design, high power supply utilization ratio, good power supply quality, high stability and security coefficient and low cost, and is suitable for high-voltage and high-speed application situations, such as subways, bullet trains, high-speed rails and the like.
Description
Technical field
What the present invention relates to is a kind of step-down conversion circuit of electric and electronic technical field, specifically is a kind of translation circuit of high pressure input-low pressure output.
Background technology
The 24V low-voltage dc power supply that is applied to electronic equipment and control circuit is the important component part of underground engines low-voltage distribution system.Along with the fast development of China's subway, motor-car, high ferro technology, more and more vigorous for the demand of low-voltage dc power supply, require also increasingly high.Volume is little, in light weight, good stability, coefficient of safety high, the low-tension supply of superhigh pressure input meets the demand for development of bullet train, has a good application prospect.
The underground engines power supply of 1500V input-24V output specifically comprises two voltage transformation links, and one is high voltage direct current input-low-voltage AC output element, and another is a low-voltage AC input-low-voltage DC output element.
In order to accomplish high voltage direct current input-low-voltage AC output element, can adopt chopper circuit, half-bridge inversion circuit and full bridge inverter.Chopper circuit is transformed to high-voltage pulse with the high-voltage dc voltage copped wave of input; This voltage is sent into back level LC filter and is obtained low-voltage dc voltage; Circuit structure is simple, and control is easy, but the electric pressure that single power device bears is bigger; The power utilization rate is lower, and input domain output pressure reduction should not adopt when excessive; The half-bridge inversion circuit structure is classical, and control method is ripe, and multiple functional, performance is higher, but the single-stage full bridge inverter also was not suitable for high input voltage, can't be applied to the high-power applications occasion of too high high pressure input-low pressure output.The full bridge inverter structure is classical, and control method is ripe, and multiple functional, performance is higher, but its cost is higher, and the single-stage full bridge inverter also was not suitable for high input voltage, can't directly apply to the high-power applications occasion of high pressure input-low pressure output.
Through the existing retrieval that is fit to the buck converter technology of high-voltage dc voltage input-low-voltage dc voltage output application scenario is found; " design of high voltage input and low-voltage large current output module power supply " (power electronic technology; 2009 the 5th phases 43 rolled up) and " the two-stage type converter of high voltage input and low-voltage multichannel output " (electrotechnics journal; The complex structure of single-phase-blow-up-DC converter of describing 2010 the 1st phases the 25th volume), design difficulty is big, and input voltage is low; Function and poor-performing are difficult to be applied to high pressure occasions such as underground engines; Chinese patent number: 02224999.0, patent name: obtain the low-tension supply of energy from high-voltage line, the buck converter of description has adopted current transformer and storage battery, and cost is higher, and its topological sum operation principle is all extremely complicated, and application difficulty is very high.
In order to accomplish the output of low-voltage ac voltage input-low-voltage dc voltage, adopt full-wave rectifying circuit, the power utilization rate is high, and each power device is only born the half the of output current, has only a tube voltage drop, and output DC stream wave amplitude is little, and power supply quality is high.
In sum, the input voltage grade of existing high pressure input-low pressure out-put supply is lower, structure and control more complicated; And the higher power supply cost height of input voltage; The topology more complicated, output voltage stability is relatively poor, all is not suitable for underground engines etc. at a high speed and the occasion of too high voltages.Along with the expansion of practical application, design a kind of simple in structure, easy, with low cost, the input voltage grade of control is high, buck converter that power supply quality is high has become those skilled in the art task of top priority.
Summary of the invention
The present invention is directed to the above-mentioned deficiency of prior art, the translation circuit of a kind of high pressure input-low pressure output be provided, achieve the DC/DC conversion, have simple in structure, control is easy, with low cost, the input voltage grade high, the power supply quality advantages of higher.
The present invention realizes through following technical scheme, the present invention includes bleeder circuit, switching circuit, rectification circuit and the filter circuit of cascade successively, and the output of bleeder circuit links to each other with the input of rectification circuit and filter circuit through switching circuit.Said bleeder circuit links to each other with negative pole with the positive pole of power supply respectively with the two ends of switching circuit; The output of switching circuit links to each other with the input of rectification circuit; The prime of rectification circuit is three step-down transformer series connection, and two ends link to each other with the output of switching circuit, and the back level is three full-wave rectifier parallel connections; Filter circuit is a capacitor filter, and two ends connect two outputs of rectification circuit respectively.
Described bleeder circuit is the capacitance partial pressure circuit: four electrochemical capacitors are connected successively; Two ends after the series connection link to each other with negative pole with the input positive source respectively; Wherein first electric capacity and second electric capacity are one group; The 3rd electric capacity and the 4th electric capacity are one group, and input voltage is divided equally, and the tie point of second electric capacity and the 3rd electric capacity is first node O1; Each electric capacity is grading resistor of parallel connection all, and first, second, third, fourth resistance is respectively first, second, third, fourth capacitor voltage equalizing; The 5th resistance and the series connection of the 6th resistance, two ends link to each other with first node O1 with the input positive source respectively, are first electric capacity and second capacitor voltage equalizing; The 7th resistance and the series connection of the 8th resistance, two ends link to each other with the input power cathode with first node O1 respectively, are the 3rd electric capacity and the 4th capacitor voltage equalizing.
The structure of described switching circuit is that four contrary switches of leading are connected; Two ends link to each other with negative pole with the input positive source respectively; Wherein the second contrary switch and the 3rd of leading is first node O1 against the tie point of leading switch; The first contrary switch and second of leading is Section Point O2 against the tie point of leading switch, and the 3rd contrary switch and the 4th of leading is the 3rd node O3 against the tie point of leading switch, and the described contrary base stage of leading switch is accepted corresponding pwm pulse control signal.
Described rectification circuit comprises the sub-rectification circuit of three input series connection-output parallel connections; Each sub-rectification circuit comprises: step-down transformer, full-wave rectifier and magnetic reset circuit; Described step-down transformer has a former limit winding and two secondary windings, and wherein three former limit windings and the 5th electric capacity are connected successively, and two ends link to each other with the 3rd node O3 with Section Point O2 respectively; Two secondary windings are with the upper and lower region branch, and link to each other with the magnetic reset circuit with full-wave rectifier respectively.Because the circuit structure of three sub-rectification circuits is identical; Only describe the concrete method of attachment of the first sub-rectification circuit here: the positive pole of first diode links to each other with the positive pole of the last secondary winding of first step-down transformer, and negative pole links to each other with the 4th node O4, and the positive pole of second diode links to each other with the negative pole of the last secondary winding of first step-down transformer; Negative pole links to each other with the 4th node O4; One end of first inductance links to each other with the centre cap of the secondary winding of first step-down transformer, and an other end links to each other with the 5th node O5, and an end of the 9th resistance links to each other with the positive pole of the following secondary winding of first step-down transformer; An other end ground connection; The 3rd diode and the 6th capacitances in series, the positive pole of the 3rd diode links to each other the minus earth of the 6th electric capacity with the negative pole of the following secondary winding of first step-down transformer.First, second, the negative pole of the 4th, the 5th, the 7th, the 8th diode links to each other with the 4th node O4, the right-hand member of first, second, third inductance links to each other with the 5th node O5.
Described filter circuit is a capacitor filter; The 9th electric capacity and the tenth capacitances in series; Two ends are connected with the 5th node O5 with the 4th node O4 respectively; The 9th electric capacity two ends parallel connections the 11 resistance wherein, the tenth electric capacity two ends parallel connection the 12 resistance, the 11 resistance and the 12 resistance are respectively the 9th electric capacity and the tenth capacitor voltage equalizing.The output output dc voltage of described filter circuit.
Adopt technique scheme, the present invention combines bleeder circuit and switching circuit to convert high voltage into low-voltage, and the primary series connection reduces the principle of single transformer pressure drop; Formulated the buck converter of high pressure input-low pressure output, bleeder circuit and switching circuit are simple in structure, and control is convenient; Can the step-down of input high voltage be handled, switch stress is little, and design of transformer is simplified; Full-wave rectifier power utilization rate is high; Output voltage stability is good, and coefficient of safety is high, can adapt to high-speed high-tension application scenarios such as subway motor-car high ferro.The present invention has project organization novelty, highly versatile, low cost and other advantages, can be used as the underground engines power supply of 1500V input-24V output.
Description of drawings
Fig. 1 is circuit theory diagrams of the present invention.
Embodiment
Elaborate in the face of embodiments of the invention down, present embodiment provided detailed execution mode and concrete operating process, but protection scope of the present invention is not limited to following embodiment being to implement under the prerequisite with technical scheme of the present invention.
As shown in Figure 1; Present embodiment provides a kind of translation circuit of high pressure input-low pressure output; The underground engines power supply that can be used for 1500V input-24V output; The bleeder circuit 1, switching circuit 2, rectification circuit 3 and the filter circuit 4 that comprise cascade successively, the output of bleeder circuit 1 links to each other with the input of rectification circuit 3 with filter circuit 4 through switching circuit 2.
Described bleeder circuit 1 is the capacitance partial pressure circuit: four capacitor C 1～C4 connect successively; Two ends link to each other with negative pole N1 with the positive level of input power supply P1 respectively; Wherein first capacitor C 1 and second capacitor C 2 are one group; The 3rd capacitor C 3 and the 4th capacitor C 4 are one group, and input voltage is divided equally, and the tie point of second capacitor C 2 and the 3rd capacitor C 3 is O1; Each electric capacity is grading resistor of parallel connection all, and first, second, third, fourth resistance R, 1～R4 is respectively first, second, third, fourth capacitor C, 1～C4 and all presses; The 5th resistance R 5 and 6 series connection of the 6th resistance R, two ends link to each other with node O1 with input positive source P1 respectively, are that first capacitor C 1 and second capacitor C 2 are all pressed; The 7th resistance R 7 and 8 series connection of the 8th resistance R, two ends link to each other with input power cathode N1 with node O1 respectively, are that the 3rd capacitor C 3 and the 4th capacitor C 4 are all pressed.
Described capacitor C 1～C4 is alminium electrolytic condenser 2200 μ F/450V.
Described resistance R 1～R8 is 120k Ω, 1%, and 2W.
The structure of described switching circuit 2 is that four contrary switch S 1～S4 that lead connect; Two ends link to each other with negative pole N1 with input positive source P1 respectively; Wherein the second contrary switch S 2 and the 3rd of leading is O1 against the tie point of leading switch S 3; The first contrary switch S 1 and second of leading is O2 against the tie point of leading switch S 2, and the 3rd contrary switch S 3 and the 4th of leading is O3 against the tie point of leading switch S 4, and described contrary gate pole of leading switch is accepted the pwm pulse control signal.
Described is power MOSFET 500V/50A/100 ℃ against leading switch S 1～S4, and contrary driving pulse of leading switch S 1～S4 is regulated according to the required output waveform of switching circuit, and switching frequency is 10kHz;
Described rectification circuit 3 comprises the sub-rectification circuit of three input series connection-output parallel connections; Each sub-rectification circuit comprises: step-down transformer, full-wave rectifier and magnetic reset circuit; Described step-down transformer has a former limit winding and two secondary windings, and wherein three former limit windings and the 4th capacitor C 5 are connected successively, and two ends link to each other with the 3rd node O3 with Section Point O2 respectively; Two secondary windings are with the upper and lower region branch, and link to each other with the magnetic reset circuit with full-wave rectifier respectively.Because the circuit structure of three sub-rectification circuits is identical; Only describe the concrete method of attachment of the first sub-rectification circuit here: the positive pole of the first diode D1 links to each other with the positive pole of the last secondary winding of the first step-down transformer T1, and negative pole links to each other with node O4, and the positive pole of the second diode D2 links to each other with the negative pole of the last secondary winding of the first step-down transformer T1; Negative pole links to each other with node O4; One end of first inductance L 1 links to each other with the centre cap of the secondary winding of the first step-down transformer T1, and an other end links to each other with the 5th node O5, and an end of the 9th resistance R 9 links to each other with the positive pole of the following secondary winding of the first step-down transformer T1; Two outer end ground connection; The 3rd diode D3 and 6 series connection of the 6th capacitor C, the positive pole of the 3rd diode D3 links to each other the minus earth of the 6th capacitor C 6 with the negative pole of the following secondary winding of the first step-down transformer T1.First, second, the negative pole of the 4th, the 5th, the 7th, the 8th diode D1, D2, D4, D5, D7, D8 links to each other with the 4th node O4, the right-hand member of first, second, third inductance L 1, L2, L3 links to each other with the 5th node O5.
Described transformer T1, T2, T3 are high-pressure type, voltage-dropping type, and no-load voltage ratio is 5: 1: 1, adopts a plurality of transformer series connection to promote the voltage endurance capability of primary.
Described diode D1～D9 is 50V/75A/100 ℃ on a reverse fast quick-recovery type, many parallel connections.
Described capacitor C 5～C8 is CBB ac capacitor 2.0uF/1200V.
Described inductance L 1～L3 is an amorphous material, and the sense value is 500uH.
Described resistance is that R9～R11 is 2.7k Ω, 1%, and 10W.
Described filter circuit 4 is a capacitor filter; The 9th capacitor C 9 and 10 series connection of the tenth capacitor C; Two ends are connected with the 5th O5 with the 4th node O4 respectively; The 9th capacitor C 9 two ends parallel connections the 11 resistance R 11, the ten capacitor C 10 two ends parallel connection the 12 resistance R 12, the 11 resistance R 11 and the 12 resistance R 12 is respectively the 9th capacitor C 9 and the tenth capacitor C 10 is all pressed wherein.The output output dc voltage of described filter circuit.
Described capacitor C 9, C10 are electrochemical capacitor 6800uF/25V;
Described resistance R 11, R12 are 0.47k Ω, 1%, and 2W.
In the present embodiment, input ac voltage is 1500V, and output dc voltage is 24V, power output 5kW.
Present embodiment carries out work in the following manner: bleeder circuit 1 is imported the voltage averaged two parts that are with HVDC, and filter capacitor makes two parts input voltage steadily smooth, and grading resistor guarantees that two parts stabilized input voltage is balanced.Only adopt three kinds of on off states: (1) state 1:S1 and S3 conducting simultaneously, rectification circuit 3 elementary windings obtain the half the of total input voltage, capacitor C 1 and C2 power supply; (2) state 2:S2 and S3 conducting simultaneously, rectification circuit 3 obtains no-voltage, rectification circuit 3 elementary winding afterflows; (3) state 3:S2 and S4 conducting simultaneously, rectification circuit 3 elementary windings obtain the half the of total input voltage, capacitor C 3 and C4 power supply; Alternately, can input voltage be chopped into pulse, pass through rectification circuit 3 and filter circuit 4 and act on and obtain low-voltage dc voltage with equal time ground user mode 1 and 2, state 3 and 2, as+24V, and DC input voitage is all pressed in a switch periods.Capacitor C 5 plays at a distance from straight effect.In state 2 operational phases, play the magnetic reset effect.The alternating voltage of switching circuit 2 outputs is sent into the step-down transformer of series connection after the 5th electric capacity filtering flip-flop, and is coupled to secondary, and like this, single transformer input terminal voltage reduces, and has simplified the design of transformer greatly.Three step-down transformer output low-voltage ac voltages flow into full-wave rectifier separately respectively in the rectification circuit 3; Full-wave rectifier carries out rectification and the output of output parallel connection generation low-voltage, high-current to low-voltage AC in the rectification circuit 3; The secondary of each step-down transformer all connects a magnetic reset circuit in addition, can prevent the magnetic saturation phenomenon that the former limit of circuit transformer in service occurs like this.
The present invention adopts capacitance partial pressure circuit and switching circuit; The reduction of input high voltage is handled for original half; The further dividing potential drop of transformer cascaded structure realizes being transformed to low-voltage alternating current power supply by high-voltage DC power supply, adopts full-wave rectifier to realize low-voltage ac voltage-low-voltage direct output again; And the output parallel connection can obtain low-voltage, high-current output.This circuit structure is simple, and modern design is converted into small voltage with big voltage dexterously and handles; Switch stress reduces greatly, the design simplification of transformer, and cost descends; The employing of full-wave rectifier has improved the power utilization rate, has guaranteed power supply quality, and the application of magnetic reset circuit can be avoided the transformer magnetic saturation; Improved job stability and coefficient of safety, design of Controller is also also uncomplicated, has obtained simulation analysis and experiment preliminary identification.And the weak point of existing buck converter scheme comprises: the input voltage grade is too low, is difficult to accomplish high-power, and circuit stability is poor, and efficient is lower, and complex structure is controlled loaded down with trivial detailsly, be difficult for to realize.
Although content of the present invention has been done detailed introduction through above-mentioned preferred embodiment, will be appreciated that above-mentioned description should not be considered to limitation of the present invention.After those skilled in the art have read foregoing, for multiple modification of the present invention with to substitute all will be conspicuous.Therefore, protection scope of the present invention should be limited appended claim.
Claims (4)
1. the translation circuit of high pressure input-low pressure output; Comprise: capacitance partial pressure circuit, switching circuit, rectification circuit and filter circuit; Wherein: the output of capacitance partial pressure circuit links to each other with the input of filter circuit with rectification circuit through switching circuit, and the filter circuit two ends connect two outputs of rectifier respectively; It is characterized in that:
Described capacitance partial pressure circuit: four electrochemical capacitors are connected successively; Two ends link to each other with negative pole with the input positive source respectively; Wherein first electric capacity and second electric capacity are one group; The 3rd electric capacity and the 4th electric capacity are one group, and input voltage is divided equally, and the tie point of second electric capacity and the 3rd electric capacity is first node (O1); Each electric capacity is grading resistor of parallel connection all, and first, second, third, fourth resistance is respectively first, second, third, fourth capacitor voltage equalizing; The 5th resistance and the series connection of the 6th resistance, two ends link to each other with first node (O1) with the input positive source respectively, are first electric capacity and second capacitor voltage equalizing; The 7th resistance and the series connection of the 8th resistance, two ends link to each other with the input power cathode with first node (O1) respectively, are the 3rd electric capacity and the 4th capacitor voltage equalizing;
The structure of described switching circuit is that four contrary switches of leading are connected; Two ends link to each other with negative pole with the input positive source respectively; Wherein the second contrary switch and the 3rd of leading is first node (O1) against the tie point of leading switch; The first contrary switch and second of leading is Section Point (O2) against the tie point of leading switch, and the 3rd contrary switch and the 4th of leading is the 3rd node (O3) against the tie point of leading switch, and described contrary gate pole of leading switch is accepted the pwm pulse control signal;
Described rectification circuit comprises the sub-rectification circuit of three input series connection-output parallel connections; Each sub-rectification circuit comprises: step-down transformer, full-wave rectifier and magnetic reset circuit; Described step-down transformer has a former limit winding and two secondary windings, and wherein three former limit windings and the 4th electric capacity are connected successively, and two ends link to each other with the 3rd node (O3) with Section Point (O2) respectively; Two secondary windings are with the upper and lower region branch, and link to each other with the magnetic reset circuit with full-wave rectifier respectively.
2. the translation circuit of high pressure input-low pressure output according to claim 1; It is characterized in that: the concrete connection of said sub-rectification circuit: the positive pole of first diode links to each other with the positive pole of the last secondary winding of first step-down transformer, and negative pole links to each other with the 4th node (O4), and the positive pole of second diode links to each other with the negative pole of the last secondary winding of first step-down transformer; Negative pole links to each other with the 4th node (O4); One end of first inductance links to each other with the centre cap of the secondary winding of first step-down transformer, and an other end links to each other with the 5th node (O5), and an end of the 9th resistance links to each other with the positive pole of the following secondary winding of first step-down transformer; An other end ground connection; The 3rd diode and the 6th capacitances in series, the positive pole of the 3rd diode links to each other the minus earth of the 6th electric capacity with the negative pole of the following secondary winding of first step-down transformer; First, second, the negative pole of the 4th, the 5th, the 7th, the 8th diode links to each other with the 4th node (O4), the right-hand member of first, second, third inductance links to each other with the 5th node (O5).
3. the translation circuit of high pressure input-low pressure output according to claim 1 and 2; It is characterized in that: described filter circuit is a capacitor filter: the 9th electric capacity and the tenth capacitances in series; Two ends are connected with the 5th (O5) with the 4th node (O4) respectively; The 9th electric capacity two ends parallel connections the 11 resistance wherein, the tenth electric capacity two ends parallel connection the 12 resistance, first resistance and the 12 resistance are respectively the 9th electric capacity and the tenth capacitor voltage equalizing.
4. the translation circuit of high pressure input-low pressure output according to claim 3 is characterized in that: the output output dc voltage of described filter circuit.
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| CN104767409A (en) * | 2015-03-13 | 2015-07-08 | 杜心林 | Direct voltage splitting circuit supporting multi-level technology |
| CN104958048A (en) * | 2015-07-02 | 2015-10-07 | 莱克电气股份有限公司 | Structure and method for motor tap to output low voltage |
| CN105896998A (en) * | 2016-06-20 | 2016-08-24 | 杭州电子科技大学 | Isolated bidirectional active full-bridge DC-DC converter |
| CN106300989A (en) * | 2016-09-05 | 2017-01-04 | 南华大学 | High direct voltage high frequency switch power that the variable modulated waveform forward position of a kind of gamut is variable and control method thereof |
| CN106856335A (en) * | 2017-03-01 | 2017-06-16 | 中山市泰峰电气有限公司 | A kind of power supply circuit for high-voltage electric energy meter |
| CN109302072A (en) * | 2018-10-23 | 2019-02-01 | 湖南大学 | The resonant mode DC converter and its control method of series connection input multiport output |
| CN110098725A (en) * | 2019-06-19 | 2019-08-06 | 邢台子中电子科技有限公司 | A kind of DC power supply output rectification tube protective circuit and method |
| CN111525804A (en) * | 2019-02-03 | 2020-08-11 | 台达电子工业股份有限公司 | DC/DC conversion system |
| CN112636599A (en) * | 2020-11-12 | 2021-04-09 | 北京无线电测量研究所 | Direct-current high-voltage to direct-current low-voltage converter circuit and conversion method |
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| CN103066807B (en) * | 2012-12-20 | 2015-12-16 | 韩腊生 | A kind of Efficient electrical energy isolation inverter |
| CN103066807A (en) * | 2012-12-20 | 2013-04-24 | 韩腊生 | Efficient electrical energy isolation inverter |
| CN104767409A (en) * | 2015-03-13 | 2015-07-08 | 杜心林 | Direct voltage splitting circuit supporting multi-level technology |
| CN104958048A (en) * | 2015-07-02 | 2015-10-07 | 莱克电气股份有限公司 | Structure and method for motor tap to output low voltage |
| CN105896998A (en) * | 2016-06-20 | 2016-08-24 | 杭州电子科技大学 | Isolated bidirectional active full-bridge DC-DC converter |
| CN106300989A (en) * | 2016-09-05 | 2017-01-04 | 南华大学 | High direct voltage high frequency switch power that the variable modulated waveform forward position of a kind of gamut is variable and control method thereof |
| CN106300989B (en) * | 2016-09-05 | 2018-11-13 | 南华大学 | A kind of gamut can be changed the variable high direct voltage high frequency switch power in modulated waveform forward position and its control method |
| CN106856335B (en) * | 2017-03-01 | 2024-06-04 | 中山市泰峰电气有限公司 | Power supply circuit for high-voltage electric energy meter |
| CN106856335A (en) * | 2017-03-01 | 2017-06-16 | 中山市泰峰电气有限公司 | A kind of power supply circuit for high-voltage electric energy meter |
| CN109302072A (en) * | 2018-10-23 | 2019-02-01 | 湖南大学 | The resonant mode DC converter and its control method of series connection input multiport output |
| CN109302072B (en) * | 2018-10-23 | 2021-02-02 | 湖南大学 | Series-input multi-port-output resonant DC converter and control method thereof |
| CN111525804A (en) * | 2019-02-03 | 2020-08-11 | 台达电子工业股份有限公司 | DC/DC conversion system |
| US11121627B2 (en) | 2019-02-03 | 2021-09-14 | Delta Electronics, Inc. | DC/DC conversion system |
| CN111525804B (en) * | 2019-02-03 | 2021-10-08 | 台达电子工业股份有限公司 | DC/DC conversion system |
| CN110098725A (en) * | 2019-06-19 | 2019-08-06 | 邢台子中电子科技有限公司 | A kind of DC power supply output rectification tube protective circuit and method |
| CN112636599A (en) * | 2020-11-12 | 2021-04-09 | 北京无线电测量研究所 | Direct-current high-voltage to direct-current low-voltage converter circuit and conversion method |
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Application publication date: 20120704 |