CN207368898U - LLC synchronous rectification driving circuits - Google Patents
LLC synchronous rectification driving circuits Download PDFInfo
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- CN207368898U CN207368898U CN201721377006.6U CN201721377006U CN207368898U CN 207368898 U CN207368898 U CN 207368898U CN 201721377006 U CN201721377006 U CN 201721377006U CN 207368898 U CN207368898 U CN 207368898U
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- synchronous rectification
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Abstract
A kind of LLC synchronous rectification driving circuits, including transformer output circuit, sample circuit, circuit of synchronous rectification and load output circuit are the utility model is related to；The winding both ends of the transformer output circuit are electrically connected with the circuit of synchronous rectification respectively, the output terminal of the transformer output circuit is electrically connected with the sample circuit, the sample circuit is electrically connected with the input terminal of the circuit of synchronous rectification, and the output terminal of the circuit of synchronous rectification is electrically connected with the input terminal of the load output circuit.The circuit by the capacitance connection of sample circuit transformer winding output terminal and circuit of synchronous rectification metal-oxide-semiconductor drain connections on, change the level height of the base stage junction of the triode of circuit of synchronous rectification using the change in polarity of transformer winding voltage, with shut-off so as to control the Push And Release of the metal-oxide-semiconductor of circuit of synchronous rectification, driving force is strong for control transistor base conducting；The circuit design is simple, and manufacture cost is low, highly practical.
Description
Technical field
It the utility model is related to Switching Power Supply electronics technical field, and in particular, to LLC synchronous rectification driving circuits.
Background technology
The LLC resonant switching powers of low-voltage and high-current are using increasingly extensive, synchronous rectification MOSFET pipe replacement two at present
The rectification circuit of pole pipe can substantially reduce the loss of rectifier, so as to improve the efficiency of converter, meet low pressure, high current rectification
Needs and be widely used.But current LLC synchronous rectification driving circuits are complicated, and of high cost or applicability is not wide, and drives
Ability is weak.
Therefore, a kind of LLC synchronous rectification driving circuits need to be provided, to solve the deficiencies in the prior art.
Utility model content
For overcome the deficiencies in the prior art, the utility model provides a kind of LLC synchronous rectification driving circuits, the circuit
The turn-on and turn-off of the working frequency Synchronization Control secondary rectification metal-oxide-semiconductor of Switching Power Supply can be effectively followed in real time.
The technical solution of the utility model is as follows：
A kind of LLC synchronous rectification driving circuits, including transformer output circuit, sample circuit, circuit of synchronous rectification and negative
Carry output circuit；The winding both ends of the transformer output circuit are electrically connected with the circuit of synchronous rectification respectively, the transformation
The output terminal of device output circuit is electrically connected with the sample circuit, the input terminal of the sample circuit and the circuit of synchronous rectification
It is electrically connected, the output terminal of the circuit of synchronous rectification is electrically connected with the input terminal of the load output circuit.
The transformer output circuit, for providing voltage to the sample circuit, the transformer output circuit includes
The transformer of first winding N1 and the second winding N2.
The sample circuit, for obtaining and exporting the sampling for the input voltage size for characterizing the transformer output circuit
Voltage, the sample circuit include capacitance series resistance, including the first sample circuit and the second sample circuit.
The circuit of synchronous rectification includes triode and metal-oxide-semiconductor, including the first circuit of synchronous rectification and the second synchronous rectification
Circuit.
The load output circuit includes power capacitor CE1, power capacitor CE2 and capacitance C415 in parallel.
Preferably, two groups of winding output terminals of the transformer also distinguish shunt capacitance C401 and C402.First winding
The output port of N1 output voltages is the first output port VDS2, and the output port of the second winding N2 output voltages is defeated for second
Exit port VDS1.
Preferably, first sample circuit includes capacitance C1 series resistances R4, and the first of the first winding N1 is defeated
Exit port VDS2 is electrically connected to capacitance C1；Second sample circuit includes capacitance C2 series resistances R8, the second winding N2
The second output port VDS1 be electrically connected to capacitance C2.The design of the sample circuit can effectively prevent the circuit of synchronous rectification
Mistake through and off.
Preferably, first circuit of synchronous rectification includes the second triode Q2, the 3rd triode Q3 and the first metal-oxide-semiconductor
QW1；The one resistance R1 of collector terminal series connection of the second triode Q2 is electrically connected with a power output end VOUT+, and described second
The base stage of triode Q2 and the base stage of the 3rd triode Q3 are electrically connected with resistance R4 respectively, the hair of the second triode Q2
The emitter of emitter-base bandgap grading and the 3rd triode Q3 are electrically connected with the grid of the first metal-oxide-semiconductor QW1, the first metal-oxide-semiconductor QW1
Drain electrode be electrically connected with the second output port VDS1 of the second winding N2, and the source electrode of the first metal-oxide-semiconductor QW1 respectively with it is described
The collector and load output circuit of 3rd triode Q3 is electrically connected.
Preferably, second circuit of synchronous rectification includes the first triode Q1, the 4th triode Q4 and the second metal-oxide-semiconductor
QW2；The one resistance R2 of collector terminal series connection of the first triode Q1 is electrically connected with power output end VOUT+, and the described 1st
The base stage of pole pipe Q1 and the base stage of the 4th triode Q4 are electrically connected with resistance R8 respectively, the transmitting of the first triode Q1
The emitter of pole and the 4th triode Q4 are electrically connected with the grid of the second metal-oxide-semiconductor QW2, the second metal-oxide-semiconductor QW2's
Drain electrode is electrically connected with the first output port VDS2 of the first winding N1, and the source electrode of the second metal-oxide-semiconductor QW2 is respectively with described the
The collector and load output circuit of four triode Q4 is electrically connected.
The beneficial effects of the utility model are：Compared with prior art, the LLC synchronous rectification driving circuits are by sampling electricity
The capacitance connection on road the transformer winding of transformer output circuit output terminal and circuit of synchronous rectification metal-oxide-semiconductor drain electrode connect
Connect in place, change the triode of circuit of synchronous rectification using the change in polarity of the transformer winding voltage of transformer output circuit
The level height of base stage junction, the conducting of control transistor base is with turning off so as to control opening for the metal-oxide-semiconductor of circuit of synchronous rectification
It is strong with pass, driving force；The circuit design is simple, and manufacture cost is low, highly practical.
Brief description of the drawings：
Fig. 1 is the frame diagram of LLC synchronous rectification driving circuits described in the utility model.
Fig. 2 is the circuit diagram of LLC synchronous rectification driving circuits described in the utility model.
Embodiment
In order to make the goal of the invention of the utility model, technical solution and technique effect are more clearly understood, with reference to tool
Body embodiment is described further the utility model.It is to be understood that specific embodiment described herein, is only used for explaining
The utility model, is not used to limit the utility model.
It should be noted that when element is referred to as " being fixed on " another element, it can be directly on another element
Or there may also be element placed in the middle.When an element is considered as " connection " another element, it can be directly connected to
To another element or it may be simultaneously present centering elements.Term as used herein " vertical ", " horizontal ", " left side ",
For illustrative purposes only, it is unique embodiment to be not offered as " right side " and similar statement.
Unless otherwise defined, all of technologies and scientific terms used here by the article is led with belonging to the technology of the utility model
The normally understood implication of technical staff in domain is identical.It is simply in the term used in the description of the utility model herein
The purpose of description specific embodiment, it is not intended that in limitation the utility model.Term as used herein " and/or " bag
Include the arbitrary and all combination of one or more relevant Listed Items.
Referring to Figures 1 and 2, the LLC synchronous rectification driving circuits of the utility model, including transformer output circuit 100, adopt
Sample circuit 200, circuit of synchronous rectification 300 and load output circuit 400；The winding both ends of the transformer output circuit 100 point
It is not electrically connected with the circuit of synchronous rectification 300, the output terminal of the transformer output circuit 100 and the sample circuit 200
It is electrically connected, the sample circuit 200 is electrically connected with the input terminal of the circuit of synchronous rectification 300, the circuit of synchronous rectification 300
Output terminal be electrically connected with the input terminal of the load output circuit 400.
Referring to Figures 1 and 2, the transformer output circuit 100 includes the transformer of the first winding N1 and the second winding N2,
For providing voltage to the sample circuit 200.In order to provide DC voltage, the winding output terminal of the transformer is also parallel with electricity
Hold.The output port of the first winding N1 output voltages is the first output port VDS2, the second winding N2 output voltages it is defeated
Exit port is the second output port VDS1.
Referring to Figures 1 and 2, the sample circuit 200 is used to obtaining and exporting the characterization transformer output circuit 100
The sampled voltage of input voltage size, the sample circuit 200 include the first sample circuit 210 and the second sample circuit 220, institute
Stating the first sample circuit 210 includes the first output port VDS2 electrical connections of capacitance C1 series resistances R4, the first winding N1
In capacitance C1；Second sample circuit 220 includes capacitance C2 series resistances R8, the second output port of the second winding N2
VDS1 is electrically connected to capacitance C2.The design of the sample circuit 200 can effectively prevent the mistake of the circuit of synchronous rectification 300 lead to
It is disconnected.
Referring to Figures 1 and 2, it is defeated according to the first winding N1 of transformer output circuit 100 and the second winding N2 output ports
The voltage gone out, the circuit of synchronous rectification 300 include the first circuit of synchronous rectification 310 and the second circuit of synchronous rectification 320；It is described
First circuit of synchronous rectification 310 includes the second triode Q2, the 3rd triode Q3 and the first metal-oxide-semiconductor QW1；Second triode
The one resistance R1 of collector terminal series connection of Q2 is electrically connected with a power output end VOUT+, the base stage of the second triode Q2 and institute
The base stage for stating the 3rd triode Q3 is electrically connected with resistance R4 respectively, the emitter of the second triode Q2 and the three or three pole
The emitter of pipe Q3 is electrically connected with the grid of the first metal-oxide-semiconductor QW1, drain electrode and the second winding N2 of the first metal-oxide-semiconductor QW1
The second output port VDS1 be electrically connected, and the source electrode of the first metal-oxide-semiconductor QW1 current collection with the 3rd triode Q3 respectively
Pole and load output circuit 400 are electrically connected.
Referring to Figures 1 and 2, second circuit of synchronous rectification 320 includes the first triode Q1, the 4th triode Q4 and the
Two metal-oxide-semiconductor QW2；The one resistance R2 of collector terminal series connection of the first triode Q1 is electrically connected with power output end VOUT+, described
The base stage of first triode Q1 and the base stage of the 4th triode Q4 are electrically connected with resistance R8 respectively, the first triode Q1
Emitter and the emitter of the 4th triode Q4 be electrically connected with the grid of the second metal-oxide-semiconductor QW2, the 2nd MOS
The drain electrode of pipe QW2 is electrically connected with the first output port VDS2 of the first winding N1, and the source electrode of the second metal-oxide-semiconductor QW2 is distinguished
It is electrically connected with the collector and load output circuit 400 of the 4th triode Q4.
With reference to Fig. 2, the load output circuit 400 includes power capacitor CE1, power capacitor CE2 and electricity in parallel
Hold C415.
The operation principle of the LLC synchronous rectification driving circuits is：
When the circuit works, when the first winding N1 pin 9 for+, the pin 8 of the first winding N1 for-, correspondingly second around
The pin 8 of group N2 for+, the pin 7 of the second winding N2 for-；The capacitance C1 of the first sample circuit 210 detects the first winding at this time
The pin 9 of N1 for+, and the base stage junction of resistance R4 and the second triode Q2 are high level, are the first circuit of synchronous rectification
The base stage of 310 the second triode Q2 turns on the second triode Q2 for high level, so that power output end VOUT+ voltages be added
Grid to the first metal-oxide-semiconductor QW1 turns on the first metal-oxide-semiconductor QW1, reaches synchronous rectification.
When the voltage of the first winding N1 inverts, the pin 9 of the first winding N1 will by+become-, the first winding N1's draws
Foot 8 will by-become+, correspondingly the pin 8 of the second winding N2 will by+become-, the pin 7 of the second winding N2 will by-become+；At this time, by
In the first winding N1 9 voltage of pin from+be changed into-, the capacitance C1 of the first sample circuit 210 detects the first winding N1's at this time
Pin 9 for-, the base stage junction of resistance R4 and the second triode Q2 are low level, be the second triode Q2 base stage be it is low
Level makes to turn on the second triode Q2, and because the transmitting collecting voltage of the 3rd triode Q3 is more than the 3rd triode Q3
Collector voltage, the 3rd triode Q3 conducting, so as to rapidly switch off the first metal-oxide-semiconductor QW1.Correspondingly the second sample circuit 220
Capacitance C2 detect the pin 7 of the second winding N2 by-become+, the base stage junction of resistance R8 and the first triode Q1 are high electric
It is flat, it is that the base stage of the first triode Q1 turns on the first triode Q1 for high level, so that by power output end VOUT+ voltages
Being added to the grid of the second metal-oxide-semiconductor QW2 turns on the second metal-oxide-semiconductor QW2, reaches synchronous rectification.
The utility model is connected to the first winding N1, the second winding N2 and the first metal-oxide-semiconductor by capacitance C1 and capacitance C2
Resistance R4, resistance R8 are changed respectively with the using the change in polarity of transformer winding voltage on the tie point of the drain electrode of QW1, QW2
The level height of the base stage junction of two triode Q2 and the first triode Q1, so as to control the first triode Q1 and the two or three pole
The base stage conducting of pipe Q2 controls the Push And Release of the first metal-oxide-semiconductor QW1 and the second metal-oxide-semiconductor QW2 of synchronous rectification with turning off；The circuit
Design is simple, and manufacture cost is low, and driving force is strong, highly practical.
Above content is to combine specific preferred embodiment further detailed description of the utility model, it is impossible to
Assert that the specific implementation of the utility model is confined to these explanations.For the ordinary skill of the utility model technical field
For personnel, without departing from the concept of the premise utility, its framework form can be flexible and changeable, can be produced with subseries
Product.Some simple deduction or replace are simply made, it is true by the claims submitted should to be all considered as belonging to the utility model
Fixed scope of patent protection.
Claims (5)
1. a kind of LLC synchronous rectification driving circuits, including transformer output circuit, sample circuit, circuit of synchronous rectification and load
Output circuit, it is characterised in that：The winding both ends of the transformer output circuit are electrically connected with the circuit of synchronous rectification respectively,
The output terminal of the transformer output circuit is electrically connected with the sample circuit, the sample circuit and the circuit of synchronous rectification
Input terminal be electrically connected, the output terminal of the circuit of synchronous rectification is electrically connected with the input terminal of the load output circuit；
The transformer output circuit, for providing voltage to the sample circuit, the transformer output circuit includes first
The transformer of winding (N1) and the second winding (N2)；
The sample circuit, for obtaining and exporting the sampling electricity for the input voltage size for characterizing the transformer output circuit
Pressure, the sample circuit include capacitance series resistance, and including the first sample circuit and the second sample circuit；
The circuit of synchronous rectification includes triode and metal-oxide-semiconductor, and including the first circuit of synchronous rectification and the second synchronous rectification electricity
Road；
The load output circuit includes power capacitor (CE1), power capacitor (CE2) and capacitance (C415) in parallel.
2. LLC synchronous rectification driving circuits according to claim 1, it is characterised in that the first winding (N1) output
The output port of voltage is the first output port (VDS2), and the output port of the second winding (N2) output voltage is defeated for second
Exit port (VDS1).
3. LLC synchronous rectification driving circuits according to claim 2, it is characterised in that first sample circuit includes
Capacitance (C1) series resistance (R4), the first output port (VDS2) of first winding (N1) are electrically connected to capacitance (C1)；Institute
Stating the second sample circuit includes capacitance (C2) series resistance (R8), the second output port (VDS1) electricity of second winding (N2)
It is connected to capacitance (C2).
4. LLC synchronous rectification driving circuits according to claim 3, it is characterised in that first circuit of synchronous rectification
Including the second triode (Q2), the 3rd triode (Q3) and the first metal-oxide-semiconductor (QW1)；The collector of second triode (Q2)
End one resistance of series connection (R1) is electrically connected with a power output end (VOUT+), the base stage of second triode (Q2) and described the
The base stage of three triodes (Q3) is electrically connected with resistance (R4) respectively, the emitter and the described 3rd 3 of second triode (Q2)
The emitter of pole pipe (Q3) is electrically connected with the grid of first metal-oxide-semiconductor (QW1), the drain electrode of first metal-oxide-semiconductor (QW1) and the
The second output ports (VDS1) of two windings (N2) is electrically connected, and the source electrode of first metal-oxide-semiconductor (QW1) is respectively with the described 3rd
The collector and load output circuit of triode (Q3) are electrically connected.
5. LLC synchronous rectification driving circuits according to claim 4, it is characterised in that second circuit of synchronous rectification
Including the first triode (Q1), the 4th triode (Q4) and the second metal-oxide-semiconductor (QW2)；The collector of first triode (Q1)
End one resistance of series connection (R2) is electrically connected with power output end (VOUT+), the base stage and the described 4th of first triode (Q1)
The base stage of triode (Q4) is electrically connected with resistance (R8) respectively, the emitter of first triode (Q1) and the four or three pole
The emitter of pipe (Q4) is electrically connected with the grid of second metal-oxide-semiconductor (QW2), the drain electrode and first of second metal-oxide-semiconductor (QW2)
The first output port (VDS2) of winding (N1) is electrically connected, and the source electrode of second metal-oxide-semiconductor (QW2) is respectively with the described 4th 3
The collector and load output circuit of pole pipe (Q4) are electrically connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721377006.6U CN207368898U (en) | 2017-10-23 | 2017-10-23 | LLC synchronous rectification driving circuits |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721377006.6U CN207368898U (en) | 2017-10-23 | 2017-10-23 | LLC synchronous rectification driving circuits |
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| Publication Number | Publication Date |
|---|---|
| CN207368898U true CN207368898U (en) | 2018-05-15 |
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ID=62420065
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| Application Number | Title | Priority Date | Filing Date |
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| CN201721377006.6U Active CN207368898U (en) | 2017-10-23 | 2017-10-23 | LLC synchronous rectification driving circuits |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114785167A (en) * | 2022-03-23 | 2022-07-22 | 电子科技大学 | Controllable rectifying circuit and voltage stabilization control method thereof |
-
2017
- 2017-10-23 CN CN201721377006.6U patent/CN207368898U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114785167A (en) * | 2022-03-23 | 2022-07-22 | 电子科技大学 | Controllable rectifying circuit and voltage stabilization control method thereof |
| CN114785167B (en) * | 2022-03-23 | 2023-04-07 | 电子科技大学 | Controllable rectification circuit and voltage stabilization control method thereof |
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