CN205430058U - Double -barrelled clamper of one way self -powered is just swashing keeps apart converter - Google Patents
Double -barrelled clamper of one way self -powered is just swashing keeps apart converter Download PDFInfo
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- CN205430058U CN205430058U CN201520400888.8U CN201520400888U CN205430058U CN 205430058 U CN205430058 U CN 205430058U CN 201520400888 U CN201520400888 U CN 201520400888U CN 205430058 U CN205430058 U CN 205430058U
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Abstract
Because there are two main switch pipes in double -barrelled positive violent change parallel operation to consequently two switch tubes need the drive of two tunnel isolation not not altogether, and common way adopts special isolating driver chip or utilizes impulse transformer isolating driver, this cost and complexity that has all increased the design undoubtedly. The purpose of the utility model is to provide an even if in order to overcome above -mentioned weak point, and provide a double -barrelled clamper of one way self -powered is just swashing keeps apart converter, it is by the double -barrelled just sharp transfer circuit of keeping apart, the PWM circuit, switch tube self -powered circuit and rectification filter circuit constitute, lower effective PWM circuit direct drive, go up the drive of effective switch tube self -powered circuit, only the low tube needs control circuit, the structure can be simplified greatly, and the top tube is earlier more open -minded than the low tube, turn -off the back, the working process is that the zero current is opened and is turn -offed with the zero current basically, be favorable to reducing loss and heat dissipation space, and the efficiency is enhanced.
Description
Technical field
This utility model relates to a kind of single channel self-powered two-tube clamper normal shock isolated converter, belongs to DC/DC and isolates soft switch transducer scope.
Background technology
Double tube positive exciting circuit overcomes the shortcoming that single tube forward converter main switch voltage stress is big.But owing to two-transistor forward converter exists two main switches, and two switching tubes are the most altogether, it is thus desirable to the driving of two-way isolation, it is common practice to use special isolation drive chip or utilize pulse transformer isolation drive, this cost both increasing design undoubtedly and complexity.
Summary of the invention
The purpose of this utility model is contemplated to overcome above-mentioned weak point, and a kind of single channel self-powered two-tube clamper normal shock isolated converter is provided, it is by double tube positive exciting isolated variable circuit, pwm circuit, switching tube self-driving circuit and current rectifying and wave filtering circuit composition, DC voltage input double tube positive exciting isolated variable circuit, the lower switching tube in double tube positive exciting isolated variable circuit is driven by pwm circuit, switching tube self-driving circuit drives the upper switching tube in double tube positive exciting isolated variable circuit, transformer coupled output in double tube positive exciting isolated variable circuit, the output of the most rectified filter circuit obtains controlled galvanic current pressure；
In technique scheme, switching tube self-driving circuit is by auxiliary winding in transformator T1 former limit in double tube positive exciting isolated variable circuit, stabilivolt Z, charging capacitor C, the self-driving circuit of switching tube Q1 on current-limiting resistance RS and driving resistance R composition, producing voltage by transformator auxiliary winding and the self coupling of main winding drives upper switching tube Q1 to turn on and off, switching tube Q4 is only descended to need control circuit, structure can be greatly simplified, and upper switching tube Q1 is more open-minded than lower switching tube Q4, rear shutoff, work process is substantially zero current turning-on and zero-current switching, be conducive to reducing loss and heat-dissipating space, improve efficiency.
This topological structure has the advantage that
(1) this topology remains that the switch tube voltage stress of two-tube clamper forward converter is low, there is not bridge arm direct pass, high reliability.
(2) increasing circuit few, structure simplifies, and frequency is high, and isolating transformer volume is little, all can save more space.
(3) achieve the Sofe Switch of switching tube, reduce loss.
Accompanying drawing explanation
Fig. 1 is circuit structure diagram of the present utility model.
Fig. 2 is initial duty isoboles of the present utility model.
Fig. 3 is duty one isoboles of the present utility model.
Fig. 4 is duty two isoboles of the present utility model.
Fig. 5 is duty three isoboles of the present utility model.
Fig. 6 is duty four isoboles of the present utility model.
Fig. 7 is duty five isoboles of the present utility model.
Fig. 8 is duty six isoboles of the present utility model.
Fig. 9 is duty seven isoboles of the present utility model.
Figure 10 is working waveform figure of the present utility model.
Detailed description of the invention
The utility model will be further described below in conjunction with the accompanying drawings.
As it is shown in figure 1, this utility model mainly comprises: power supply Uin, auxiliary pipe Q1, electric capacity C1, is responsible for Q4, electric capacity C4, clamp diode D2 and D3, power transformer T1, commutation diode D5, sustained diode 6, filter inductance L and output filter capacitor Cout, current-limiting resistance RS, drives resistance R, stabilivolt Z, charging capacitor C.
As shown in Figure 2, initial duty isoboles of the present utility model, two switching tubes of initial state all do not turn on, power supply Uin charges to electric capacity C1, C4, primary side winding voltage begins to decline from Uin, transformer primary side exciting current linear rise, when the voltage on C1 and C4 is charged to Uin/2, transformer primary side winding voltage drops to 0, and exciting current continues constant.
As shown in Figure 3, duty one isoboles of the present utility model, control chip produces PWM ripple makes supervisor Q4 turn on, voltage on C1 is risen by Uin/2, primary side winding voltage begins to decline from Uin/2, exciting current continues to rise, power supply Uin, current-limiting resistance RS, charging capacitor C, transformer primary side auxiliary winding, main winding forms a loop, electric capacity C is charged, when the voltage on C rises to the unlatching threshold value of auxiliary pipe Q1, auxiliary pipe Q1 turns on, transformer primary side winding voltage steps to Uin, exciting current keeps constant, the electric current of rectifier tube D5 rises very rapidly up to I from 0O。
As shown in Figure 4, duty two isoboles of the present utility model, Q4 turns off, owing to the voltage on winding will not drop to 0 at once, auxiliary pipe Q1 still turns on, electric capacity C4 charges, both end voltage starts to rise rapidly, voltage on transformer primary side main winding and auxiliary winding starts to decline rapidly, the rectifier tube D5 of transformer secondary output is held on, and in the drive circuit of auxiliary pipe Q1, auxiliary winding begins through driving resistance R to electric capacity C charging, to the gate pole parasitic capacitance discharge of Q1, electric capacity C both end voltage linear rise, Q1 gate voltage VGSLinear decline.
As it is shown in figure 5, duty three isoboles of the present utility model, auxiliary pipe Q1 ends, and transformer primary side winding voltage is zero, and occurs that reverse trend, sustained diode 6 turn on, and exports electric current IOStarting to change to D6 from D5, exciting current keeps constant, and voltage, beginning on electric capacity C1, C4 rise rapidly.
As shown in Figure 6, duty four isoboles of the present utility model, exciting current starts linear decline, electric capacity C1, C4 charge to Uin, and transformer primary side winding voltage drops to-Uin, and reset diode turns on, voltage on electric capacity C1, C4 is clamped in Uin, transformator magnetic reset.Auxiliary winding voltage starts reversely, and charging capacitor C both end voltage continues to rise.
As it is shown in fig. 7, duty five isoboles of the present utility model, transformator resets and terminates, magnetizing inductance and switching tube capacitor resonance, and exciting current is started from scratch and reversely increased, and to electric capacity C1, C4 reverse charging, the voltage on electric capacity is begun to decline to Uin/2 by Uin；Voltage on main winding also begins to be dropped to zero by-Uin, works as VGSWhen rising to the threshold value that Q1 opens, Q1 turns on, and now Q4 is still off, and the electric charge on C1 is promptly released into zero, and the voltage in Q4 parasitic capacitance is charged to rapidly Uin, and this electric current can form the little spike of voltage of a forward on winding.
As shown in Figure 8, duty six isoboles of the present utility model, supervisor's Q4 conducting, electric capacity C4 is discharged by switching tube, load current IO is transferred to commutation diode D5 by sustained diode 6, and the voltage on main winding rises rapidly, drives the voltage on winding to rise the most rapidly, C is reversed charging, and both end voltage declines rapidly.
As it is shown in figure 9, duty seven isoboles of the present utility model, the change of current terminates, and exciting current starts linear rise, starts to transmit energy to secondary.Voltage on main winding remains Uin.
As shown in Figure 10, working waveform figure of the present utility model, from the beginning of the t4 moment, circuit enters the normal circulation stage, auxiliary pipe Q1 first opens than supervisor Q4, turns off afterwards, the work process of auxiliary pipe Q1 is substantially zero current turning-on and zero-current switching, and the loss on the most auxiliary pipe Q1 is greatly reduced, beneficially the raising of circuit rectifies efficiency.
Claims (1)
1. single channel self-powered two-tube clamper normal shock isolated converter, including double tube positive exciting isolated variable circuit, pwm circuit, switching tube self-driving circuit and current rectifying and wave filtering circuit, it is characterized in that: DC voltage input double tube positive exciting isolated variable circuit, the lower switching tube in double tube positive exciting isolated variable circuit is driven by pwm circuit, switching tube self-driving circuit drives the upper switching tube in double tube positive exciting isolated variable circuit, transformer coupled output in double tube positive exciting isolated variable circuit, more rectified filter circuit output obtain controlled galvanic current pressure；Switching tube self-driving circuit is by transformator T1 former limit auxiliary winding, stabilivolt Z, charging capacitor C, current-limiting resistance RS in double tube positive exciting isolated variable circuit and drives resistance R to constitute, and described charging capacitor C bipod both positive and negative polarity with stabilivolt Z respectively is connected；The positive pole of described stabilivolt Z is connected with transformator T1 auxiliary Motor Winding Same Name of Ends；Described current-limiting resistance RS bipod is connected with the drain electrode of upper switching tube Q1 and the negative pole of stabilivolt Z respectively；Described current-limiting resistance R bipod is connected with the grid of upper switching tube Q1 and the negative pole of stabilivolt Z respectively, constitutes the self-driving circuit of switching tube Q1, produces voltage by transformator auxiliary winding and the self coupling of main winding and drives upper switching tube Q1 to turn on and off.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520400888.8U CN205430058U (en) | 2015-06-11 | 2015-06-11 | Double -barrelled clamper of one way self -powered is just swashing keeps apart converter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520400888.8U CN205430058U (en) | 2015-06-11 | 2015-06-11 | Double -barrelled clamper of one way self -powered is just swashing keeps apart converter |
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| CN205430058U true CN205430058U (en) | 2016-08-03 |
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| CN201520400888.8U Active CN205430058U (en) | 2015-06-11 | 2015-06-11 | Double -barrelled clamper of one way self -powered is just swashing keeps apart converter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110707947A (en) * | 2019-10-16 | 2020-01-17 | 福州物联网开放实验室有限公司 | Bridgeless single-pole PFC circuit |
-
2015
- 2015-06-11 CN CN201520400888.8U patent/CN205430058U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110707947A (en) * | 2019-10-16 | 2020-01-17 | 福州物联网开放实验室有限公司 | Bridgeless single-pole PFC circuit |
| CN110707947B (en) * | 2019-10-16 | 2022-04-05 | 福州物联网开放实验室有限公司 | Bridgeless single-pole PFC circuit |
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| C14 | Grant of patent or utility model | ||
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