CN202713162U - Low-voltage large-current direct current power supply - Google Patents
Low-voltage large-current direct current power supply Download PDFInfo
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- CN202713162U CN202713162U CN 201220197598 CN201220197598U CN202713162U CN 202713162 U CN202713162 U CN 202713162U CN 201220197598 CN201220197598 CN 201220197598 CN 201220197598 U CN201220197598 U CN 201220197598U CN 202713162 U CN202713162 U CN 202713162U
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Abstract
The utility model relates to a low-voltage large-current direct current power supply, so as to solve the problems that the existing straight down type on-load voltage regulation power supply way is complicated in the control method and troublesome in operation, and designing a trigger circuit and a protection circuit at the large current side is different and high in cost. An alternating current (alternating-alternating) voltage regulation circuit is added at the primary side (small current side), the primary side voltage is controlled and regulated by changing the trigger angle of a switch tube, and the on-load voltage regulation does not need to be carried out any longer. The control method and steps of the power supply are simplified, and as control is carried out at the small current side, designing the trigger circuit and the protection circuit is comparatively simple. In addition, as three single-phase three-winding transformers are adopted to replace an original one three-phase transformer, the problems of unbalanced magnetic flux of the transformer, further unequal output voltage and the like caused by three-phase alternating current voltage regulation can be solved. In the entire circuit, a controllable device is used at the lower current side, and the higher current side only needs diode rectification, thereby simplifying the structure and reducing the cost.
Description
Technical field
The utility model relates to a kind of low-voltage, high-current DC power supply, particularly a kind of controllable direct current power supply of exporting the above electric current of several kiloamperes.
Background technology
Along with semiconductor technology develop rapidly and shortcoming that alternating current produces in industrial production becomes increasingly conspicuous, the low-voltage, high-current direct current energy obtains people's attention.At present, the low-voltage, high-current DC power supply extensively adopts the structure of linear descending loaded switch rectifier transformer power supply, the tap of rectifier transformer primary side band, and the wiring of secondary side double reverse-stars type, loaded switch is as there being a grade coarse adjustment, and thyristor is as fine tuning in the level.This structure power control method is complicated, troublesome poeration, and is large in large electric current side design triggering and protective circuit difficulty thereof; And rectifying device employing controllable devices impact meeting power supply capacity, cost is very high.
The utility model content
The purpose of this utility model provides a kind of low-voltage, high-current DC power supply, and existing linear descending on-load voltage regulation supply power mode control method is complicated in order to solve, troublesome poeration, in the problem that large electric current side design triggers and the protective circuit difficulty is large, cost is high.
For achieving the above object, scheme of the present utility model is: a kind of low-voltage, high-current DC power supply, comprise three AC voltage adjusting circuit that connect respectively three-phase alternating-current supply, each AC voltage adjusting circuit connects a single-phase rectifier transformer, each single-phase rectifier transformer has a former limit and two equal turn numbers, opposite polarity secondary winding, and six secondary windings of three single-phase rectifier transformers connect the double reverse-stars type rectification circuits; Described AC voltage adjusting circuit comprises two inverse parallel controlled tr tubes with corresponding mutually former limit windings in series.
Described controlled tr tube is IGBT.
Described double reverse-stars type rectification circuit is with the double reverse-stars type of interphase reactor control rectifying circuit not.
The former limit winding of each single-phase rectifier transformer all is parallel with the RC resistance capaciting absorpting circuit.
Each secondary winding of each single-phase rectifier transformer all is parallel with the RC resistance capaciting absorpting circuit.
The utility model (hand over-hand over) regulating circuit of increasing exchanges at primary side (little electric current side) is adjusted primary side voltage by changing the switching tube trigger angle control, need not carry out on-load voltage regulation again.Simplified control method and the step of power supply, and control is placed on little electric current side has carried out, triggered and protecting circuit designed is easier to.And the utility model adopts three single-phase three-winding transformers, replaces an original three-phase transformer, can solve the problem that transformer flux is uneven and then output voltage that cause does not wait that three phase ac voltage regulation causes.Whole circuit uses controllable devices in the reduced-current side, and the high current side only need be used diode rectification, thereby simplified structure, reduces cost.
In addition, in the double reverse-stars type rectification circuit, replace controlled tr tube with diode, simplified interlock circuit, and can not affect power supply capacity, cost is also lower.
Description of drawings
Fig. 1 is structured flowchart of the present utility model;
Fig. 2 is circuit diagram of the present utility model;
Fig. 3 be the utility model in the specified 30V/2000A of being output as situation, pure resistive load is in the electric current output waveform of different pilot angles;
Fig. 4 be the utility model in the specified 30V/2000A of being output as situation, the electric current output waveform of different pilot angles during inductive load.
Embodiment
The utility model is described in more detail below in conjunction with accompanying drawing.
Low-voltage, high-current DC power supply as shown in Figure 1 comprises the AC voltage adjusting circuit 1 that connects successively, single-phase rectifier transformer 2, double reverse-stars type rectification circuit.Such as Fig. 2, AC voltage adjusting circuit 1 is divided into three-phase (A phase regulating circuit 4, B phase regulating circuit 5 and C be regulating circuit 6 mutually), and is corresponding with three single-phase rectifier transformers 2.Mutually as example, A phase regulating circuit 4 is made of two inverse parallel IGBT that are connected on A commutating phase transformer T1 take A.As other execution modes, also can adopt other controlled tr tube to substitute IGBT, such as GTO, MOSFET etc.Circuit is realized control to output current, voltage by the angle of flow that changes IGBT.
Single-phase rectifier transformer 2 is step-down transformer, A commutating phase transformer T1, B commutating phase transformer T2, C commutating phase transformer T3, their script T1-1, T1-2, T1-3 are connected respectively regulating circuit 4,5,6, each single-phase rectifier transformer has two secondary windings, and (number of turn is relevant, polarity is opposite, T1-2, T1-3, T2-2, T2-3, T3-2, T3-3), connect into double reverse-stars type, form not control rectifying circuit of double reverse-stars type with corresponding rectifier diode (D1-D6).Every group of secondary winding connects rectifier diode, form two three-plase half wave rectifier circuits, be equipped with interphase reactor Lp between the neutral point of two three-plase half wave rectifier circuits, the negative electrode of each rectifier diode links together and consists of the not positive pole of control rectifying circuit of double reverse-stars type, the centre tap of interphase reactor Lp consists of the not negative pole b of control rectifying circuit of double reverse-stars type, is load such as Rd among Fig. 2.Adopt three single-phase three-winding transformers can solve the problem that transformer flux is uneven and then output voltage that cause does not wait that three phase ac voltage regulation causes.Whole circuit uses controllable devices in the reduced-current side, and the high current side only need be used diode rectification, thereby simplified structure, reduces cost.
The former limit of single-phase rectifier transformer, secondary winding all are parallel with RC resistance capaciting absorpting circuit (RC1-RC9).Clamper is carried out to the self induction electromotive force that winding produces when the current transients in RC resistance-capacitance absorption loop, and in the circuit because dV/dt suppresses the impact that power device causes, make the level and smooth voltage of single-phase rectifier transformer secondary output waveform.Rectifying bridge arm D1, D3, D5 are one group of three-plase half wave rectifier circuit, rectifier bridge wall D4, D6, D2 are another group three-plase half wave rectifier circuit, these two groups of three-plase half wave rectifier circuits have formed the double reverse-stars type rectification circuit, interphase reactor Lp assurance any time, two groups of three-plase half wave rectifier circuits can conduct electricity simultaneously, bear a half load for every group, therefore the selection of diode and single-phase rectifier transformer secondary winding rated capacity is definite as long as press half calculating of rated current.
The present invention is applicable to vitreous silica stove, resistance furnace, metallide, the low-voltage, high-current DC power supply in the fields such as experiment test platform.Fig. 3, Fig. 4 are the current waveform figures that circuit is exported under the heterogeneity load during with the specified 30V/2000A of being output as.Because this circuit three-phase electricity is not controlled at 0 °～30 °, so with 30 ° of starting points that are designated as AC voltage regulator delay angle а, namely should а=0 °, place.Fig. 3 is the output waveform of pure resistive load electric current when pilot angle is 0 °, 30 °, 60 °, and Fig. 4 is the output waveform of inductive load electric current when pilot angle is 0 °, 30 °, 60 °.As seen the present invention is simple to operate, adaptable, dynamic effect is good, use diode rectification so that being greatly improved of circuit capacity has very large using value in practice.
Claims (5)
1. low-voltage, high-current DC power supply, it is characterized in that, comprise three AC voltage adjusting circuit that connect respectively three-phase alternating-current supply, each AC voltage adjusting circuit connects a single-phase rectifier transformer, each single-phase rectifier transformer has a former limit and two equal turn numbers, opposite polarity secondary winding, and six secondary windings of three single-phase rectifier transformers connect the double reverse-stars type rectification circuits; Described AC voltage adjusting circuit comprises two inverse parallel controlled tr tubes with corresponding mutually former limit windings in series.
2. a kind of low-voltage, high-current DC power supply according to claim 1 is characterized in that, described controlled tr tube is IGBT.
3. a kind of low-voltage, high-current DC power supply according to claim 2 is characterized in that, described double reverse-stars type rectification circuit is with the double reverse-stars type of interphase reactor control rectifying circuit not.
4. a kind of low-voltage, high-current DC power supply according to claim 3 is characterized in that, the former limit winding of each single-phase rectifier transformer all is parallel with the RC resistance capaciting absorpting circuit.
5. according to claim 3 or 4 described a kind of low-voltage, high-current DC power supply, it is characterized in that, each secondary winding of each single-phase rectifier transformer all is parallel with the RC resistance capaciting absorpting circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220197598 CN202713162U (en) | 2012-05-04 | 2012-05-04 | Low-voltage large-current direct current power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220197598 CN202713162U (en) | 2012-05-04 | 2012-05-04 | Low-voltage large-current direct current power supply |
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| Publication Number | Publication Date |
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| CN202713162U true CN202713162U (en) | 2013-01-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220197598 Expired - Fee Related CN202713162U (en) | 2012-05-04 | 2012-05-04 | Low-voltage large-current direct current power supply |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107852093A (en) * | 2015-07-03 | 2018-03-27 | 日立汽车***株式会社 | Power inverter |
| CN112803787A (en) * | 2019-10-28 | 2021-05-14 | 株洲中车机电科技有限公司 | Locomotive traction transformer and application thereof |
| CN113109702A (en) * | 2020-01-09 | 2021-07-13 | 苏州电器科学研究院股份有限公司 | Test loop and test method for breaking large current |
-
2012
- 2012-05-04 CN CN 201220197598 patent/CN202713162U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107852093A (en) * | 2015-07-03 | 2018-03-27 | 日立汽车***株式会社 | Power inverter |
| CN112803787A (en) * | 2019-10-28 | 2021-05-14 | 株洲中车机电科技有限公司 | Locomotive traction transformer and application thereof |
| CN113109702A (en) * | 2020-01-09 | 2021-07-13 | 苏州电器科学研究院股份有限公司 | Test loop and test method for breaking large current |
| CN113109702B (en) * | 2020-01-09 | 2023-03-03 | 苏州电器科学研究院股份有限公司 | Test loop and test method for breaking large current |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130130 Termination date: 20160504 |
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| CF01 | Termination of patent right due to non-payment of annual fee |