CN202889179U - Power switch tube driving circuit applied to synchronous rectification - Google Patents
Power switch tube driving circuit applied to synchronous rectification Download PDFInfo
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- CN202889179U CN202889179U CN 201220511154 CN201220511154U CN202889179U CN 202889179 U CN202889179 U CN 202889179U CN 201220511154 CN201220511154 CN 201220511154 CN 201220511154 U CN201220511154 U CN 201220511154U CN 202889179 U CN202889179 U CN 202889179U
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Abstract
The utility model discloses a power switch tube driving circuit applied to synchronous rectification. The driving circuit includes at least one group of driving sub-circuits. The output terminal V1 of a driving transformer VT of the driving sub-circuit is connected with one terminal of a resistor R1 and one terminal of a resistor R2 respectively. The output terminal V2 of the driving transformer VT is connected with the other terminal of the resistor R2 and one terminal of a resistor R3 respectively. The other terminal of the resistor R1 is connected with the drain electrode of a switch tube M1 and the grid electrode of a switch tube M2 respectively. The other terminal of the resistor R3 is connected with the anode of a voltage stabilizing tube Z1, one terminal of a resistor R4, one terminal of a charging capacitor C1, the source electrode of the switch tube M1, and the source electrode of the switch tube M2 respectively. The cathode of the voltage stabilizing tube Z1 is connected with the anode of a diode D1 and the emitter electrode of a triode N1 respectively. The other terminal of the resistor R4 is connected with the base electrode of the triode N1. The other terminal of the charging capacitor C1 is connected with the collector electrode of the triode N1 and the grid electrode of the switch tube M1 respectively. The cathode of the diode D1 is connected with the grid electrode of the switch tube M1. The driving circuit can effectively improve the driving stability and the load driving capability.
Description
Technical field
The utility model relates to the drive circuit technical field of power electronic product, relates in particular to the power switch tube drives circuit that a kind of synchronous rectification is used.
Background technology
Drive circuit is a requisite functional unit in the switching power circuit, is the bridge that signal transmits between control circuit and the power circuit, by the power amplification of drive circuit realization to switching signal, satisfies switch element to the requirement of input power.Drive circuit requires usually it is had two when design aspect:
The first, satisfy switch element to the control functional requirement of switching signal.The design of drive circuit must require as prerequisite the control of switch element to realize circuit, distortionless control signal is passed to device for power switching.
The second, avoid interference to greatest extent importing into of signal.Drive circuit not only self will pass to power cell to control signal, also will have to the interference signal from outside unit effective protection simultaneously, misleads in order to avoid power device receives wrong control signal and misses and turn-off phenomenon.
In the existing synchronous rectification control, relatively more commonly used is to adopt integrated IC control chip, take IR(International Rectifier) the synchronous rectification IC chip I R11682S of company is example, this chip is by to D(drain electrode) the S(source electrode) the bipod commutating voltage samples, and realizes exporting different driving signals by detecting the change in voltage of commutating voltage in the half period.The typical advantages of this scheme is to adopt integrated IC, and control program is simple, realizes that the used element of circuit function is less.
Yet in the application process of actual drive circuits, the designer finds prior art, and there are the following problems:
Existing integrated IC control chip cost is higher, is subjected to simultaneously the restriction of driving force, and when many switching tubes of demand motive, this scheme can not realize being connected in parallel of control chip, otherwise can cause misleading of switching tube.
The utility model content
The power switch tube drives circuit that embodiment of the present utility model provides a kind of synchronous rectification to use.For achieving the above object, embodiment of the present utility model adopts following technical scheme:
The power switch tube drives circuit that a kind of synchronous rectification that the utility model provides is used comprises: at least one group of drive sub-circuits; Described drive sub-circuits comprises: driving transformer, resistance R 1, resistance R 2, resistance R 3, resistance R 4, voltage-stabiliser tube Z1, diode D1, triode N1, charging capacitor C1, switching tube M1, switching tube M2;
Described driving transformer V
TThe control signal that sends of input connection control circuit;
Described driving transformer V
TOutput V1 link to each other with resistance R 2 one ends with described resistance R 1 respectively;
Described driving transformer V
TOutput V2 respectively with the other end of described resistance R 2, an end of described resistance R 3 links to each other;
Described resistance R 1 other end links to each other with the drain electrode of described switching tube M1, the grid of described switching tube M2 respectively; Described resistance R 3 other ends link to each other with described voltage-stabiliser tube Z1 positive pole, resistance R 4 one ends, charging capacitor C1 one end, the source electrode of switching tube M1, the source electrode of switching tube M2 respectively;
Described voltage-stabiliser tube Z1 negative pole respectively, triode N1 emitter anodal with described diode D1 links to each other;
Described resistance R 4 other ends link to each other with described triode N1 base stage;
The described charging capacitor C1 other end links to each other with the grid of described triode N1 collector electrode, described switching tube M1 respectively;
Described diode D1 negative pole links to each other with the grid of described switching tube M1.
The power switch tube drives circuit that a kind of synchronous rectification that the utility model provides is used drives load by at least one group of drive sub-circuits; The group number of this drive sub-circuits is determined by loading demand; Described drive sub-circuits comprises: driving transformer, resistance R 1, resistance R 2, resistance R 3, resistance R 4, voltage-stabiliser tube Z1, diode D1, triode N1, charging capacitor C1, switching tube M1, switching tube M2; Described driving transformer V
TThe control signal that sends of input connection control circuit; Described driving transformer V
TOutput V1 link to each other with resistance R 2 one ends with described resistance R 1 respectively; Described driving transformer V
TOutput V2 respectively with the other end of described resistance R 2, an end of described resistance R 3 links to each other; Described resistance R 1 other end links to each other with the drain electrode of described switching tube M1, the grid of described switching tube M2 respectively; Described resistance R 3 other ends link to each other with described voltage-stabiliser tube Z1 positive pole, resistance R 4 one ends, charging capacitor C1 one end, the source electrode of switching tube M1, the source electrode of switching tube M2 respectively; Described voltage-stabiliser tube Z1 negative pole respectively, triode N1 emitter anodal with described diode D1 links to each other; Described resistance R 4 other ends link to each other with described triode N1 base stage; The described charging capacitor C1 other end links to each other with the grid of described triode N1 collector electrode, described switching tube M1 respectively; Described diode D1 negative pole links to each other with the grid of described switching tube M1.Adopt this drive circuit to promote load capacity by at least one group of drive sub-circuits of parallel connection, thereby reach the purpose that satisfies loading demand; This drive circuit is because the existence of charging capacitor C1, the stability that can also Effective Raise drives.
Description of drawings
The power switch tube drives circuit diagram that Fig. 1 uses for a kind of synchronous rectification that the utility model embodiment provides;
The driving transformer output level sequential chart of the power switch tube drives circuit that Fig. 2 uses for a kind of synchronous rectification that the utility model embodiment provides.
Embodiment
The power switch tube drives circuit that a kind of synchronous rectification that the utility model embodiment is provided below in conjunction with accompanying drawing is used is described in detail.
The power switch tube drives circuit that a kind of synchronous rectification that the utility model provides is used comprises: at least one group of drive sub-circuits; Described drive sub-circuits comprises: driving transformer, resistance R 1, resistance R 2, resistance R 3, resistance R 4, voltage-stabiliser tube Z1, diode D1, triode N1, charging capacitor C1, switching tube M1, switching tube M2;
Described driving transformer V
TThe control signal that sends of input connection control circuit;
Described driving transformer V
TOutput V1 link to each other with resistance R 2 one ends with described resistance R 1 respectively;
Described driving transformer V
TOutput V2 respectively with the other end of described resistance R 2, an end of described resistance R 3 links to each other;
Described resistance R 1 other end links to each other with the drain electrode of described switching tube M1, the grid of described switching tube M2 respectively; Described resistance R 3 other ends link to each other with described voltage-stabiliser tube Z1 positive pole, resistance R 4 one ends, charging capacitor C1 one end, the source electrode of switching tube M1, the source electrode of switching tube M2 respectively;
Described voltage-stabiliser tube Z1 negative pole respectively, triode N1 emitter anodal with described diode D1 links to each other;
Described resistance R 4 other ends link to each other with described triode N1 base stage;
The described charging capacitor C1 other end links to each other with the grid of described triode N1 collector electrode, described switching tube M1 respectively;
Described diode D1 negative pole links to each other with the grid of described switching tube M1.
Above-described main circuit topology.VT is driving transformer, and Vg is the control signal that control circuit sends, and VDS is the main transformer output voltage.N1 is common NPN triode 4401, and M1 is that NDS351 is MOSFET, and M2 is that 28N08 is MOSFET.
At first, the level state of described control signal Vg, as shown in Figure 2, three level of driving transformer output: positive level V1, the flat V2 of the negative point of zero-sum.Three kinds of respectively corresponding three kinds of on off states of level, namely
The positive level state---open main MOSFET M2;
Negative some level state---turn-off main MOSFET M2;
Nought state---drive free state, should guarantee under this state that main MOSFET M2 is for turn-offing;
The course of work: when driving transformer was output as high level V1, main metal-oxide-semiconductor M2 grid obtained forward voltage and conducting, and voltage-stabiliser tube Z1 two ends dividing potential drop makes triode N1 conducting, the C1 discharge, and M1 turn-offs and is retained to before the next switching signal arrival; When driving transformer is output as the flat V2 of negative point, drive signal and be rapidly the C1 charging by D1, switching tube M1 grid obtains the forward voltage conducting, main metal-oxide-semiconductor M2 grid is by M1 repid discharge (the M1 conducting resistance is very little), thereby enter into rapidly off state, this moment triode N1 the G(grid) the S(source electrode) end owing to bearing negative pressure, C1 is constant owing to there not being discharge loop to keep the M1 grid voltage, thereby M1 is opened until there is switching signal to make its shutoff.
So-called driving free state refers to a kind of like this state, and namely the output voltage of driving transformer is zero.Such state has comprised the driving dead band that artificial setting or driving element itself require, and has also comprised in the design process that element is not controlled simultaneously and driving transformer that form is output as zero.For instance, leading portion control signal Vg such as driving transformer derives from a forward converter, and V1 is driving voltage, and V2 is the voltage that the magnetic reset process forms, do not arrive if still drive signal after V2 resets and finishes so, this moment will occur driving free state.
The utility model is when occurring driving free state, because the existence of C1, the M1 grid bears forward voltage always and keeps open-minded, thereby has guaranteed the reliable turn-off of M2.So signal dutyfactor and Dead Time are variable etc. free state very easily to occur driving when driving, and when responsive to interference signal, but the stability that the design's Effective Raise drives.
In addition, when demand motive variable connector pipe, the utility model only needs the respective drive electronic circuit that increases in parallel to get final product, and is not subjected to the Power Limitation of integrated component, thereby has greatly promoted driving force, has reduced constrained.
The power switch tube drives circuit that a kind of synchronous rectification that the utility model provides is used drives load by at least one group of drive sub-circuits; The group number of this drive sub-circuits is determined by loading demand; Described drive sub-circuits comprises: driving transformer, resistance R 1, resistance R 2, resistance R 3, resistance R 4, voltage-stabiliser tube Z1, diode D1, triode N1, charging capacitor C1, switching tube M1, switching tube M2; Described driving transformer V
TThe control signal that sends of input connection control circuit; Described driving transformer V
TOutput V1 link to each other with resistance R 2 one ends with described resistance R 1 respectively; Described driving transformer V
TOutput V2 respectively with the other end of described resistance R 2, an end of described resistance R 3 links to each other; Described resistance R 1 other end links to each other with the drain electrode of described switching tube M1, the grid of described switching tube M2 respectively; Described resistance R 3 other ends link to each other with described voltage-stabiliser tube Z1 positive pole, resistance R 4 one ends, charging capacitor C1 one end, the source electrode of switching tube M1, the source electrode of switching tube M2 respectively; Described voltage-stabiliser tube Z1 negative pole respectively, triode N1 emitter anodal with described diode D1 links to each other; Described resistance R 4 other ends link to each other with described triode N1 base stage; The described charging capacitor C1 other end links to each other with the grid of described triode N1 collector electrode, described switching tube M1 respectively; Described diode D1 negative pole links to each other with the grid of described switching tube M1.Adopt this drive circuit to promote load capacity by at least one group of drive sub-circuits of parallel connection, thereby reach the purpose that satisfies loading demand; This drive circuit is because the existence of charging capacitor C1 and auxiliary switch M1, the stability that can also Effective Raise drives.
The above; it only is embodiment of the present utility model; but protection range of the present utility model is not limited to this; anyly be familiar with those skilled in the art in the technical scope that the utility model discloses; can expect easily changing or replacing, all should be encompassed within the protection range of the present utility model.Therefore, protection range of the present utility model should be as the criterion by described protection range with claim.
Claims (1)
1. the power switch tube drives circuit that synchronous rectification is used is characterized in that, comprising: at least one group of drive sub-circuits; Described drive sub-circuits comprises: driving transformer, resistance R 1, resistance R 2, resistance R 3, resistance R 4, voltage-stabiliser tube Z1, diode D1, triode N1, charging capacitor C1, switching tube M1, switching tube M2;
Described driving transformer V
TThe control signal that sends of input connection control circuit;
Described driving transformer V
TOutput V1 link to each other with resistance R 2 one ends with described resistance R 1 respectively;
Described driving transformer V
TOutput V2 respectively with the other end of described resistance R 2, an end of described resistance R 3 links to each other;
Described resistance R 1 other end links to each other with the drain electrode of described switching tube M1, the grid of described switching tube M2 respectively; Described resistance R 3 other ends link to each other with described voltage-stabiliser tube Z1 positive pole, resistance R 4 one ends, charging capacitor C1 one end, the source electrode of switching tube M1, the source electrode of switching tube M2 respectively;
Described voltage-stabiliser tube Z1 negative pole respectively, triode N1 emitter anodal with described diode D1 links to each other;
Described resistance R 4 other ends link to each other with described triode N1 base stage;
The described charging capacitor C1 other end links to each other with the grid of described triode N1 collector electrode, described switching tube M1 respectively;
Described diode D1 negative pole links to each other with the grid of described switching tube M1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220511154 CN202889179U (en) | 2012-10-08 | 2012-10-08 | Power switch tube driving circuit applied to synchronous rectification |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220511154 CN202889179U (en) | 2012-10-08 | 2012-10-08 | Power switch tube driving circuit applied to synchronous rectification |
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| Publication Number | Publication Date |
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| CN202889179U true CN202889179U (en) | 2013-04-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220511154 Expired - Lifetime CN202889179U (en) | 2012-10-08 | 2012-10-08 | Power switch tube driving circuit applied to synchronous rectification |
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| CN (1) | CN202889179U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108183617A (en) * | 2018-02-06 | 2018-06-19 | 北京航天发射技术研究所 | A kind of synchronous rectification control method and control device |
-
2012
- 2012-10-08 CN CN 201220511154 patent/CN202889179U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108183617A (en) * | 2018-02-06 | 2018-06-19 | 北京航天发射技术研究所 | A kind of synchronous rectification control method and control device |
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Granted publication date: 20130417 |
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| CX01 | Expiry of patent term |