CN208445482U - Inhibit the control circuit of phase-shifting full-bridge secondary-side voltage oscillation - Google Patents
Inhibit the control circuit of phase-shifting full-bridge secondary-side voltage oscillation Download PDFInfo
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- CN208445482U CN208445482U CN201821065257.5U CN201821065257U CN208445482U CN 208445482 U CN208445482 U CN 208445482U CN 201821065257 U CN201821065257 U CN 201821065257U CN 208445482 U CN208445482 U CN 208445482U
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- 230000010355 oscillation Effects 0.000 title claims abstract description 23
- 230000009466 transformation Effects 0.000 claims abstract description 21
- 230000007246 mechanism Effects 0.000 claims abstract description 20
- 230000002401 inhibitory effect Effects 0.000 claims abstract 6
- 230000005669 field effect Effects 0.000 claims description 11
- 229910044991 metal oxide Inorganic materials 0.000 claims description 11
- 150000004706 metal oxides Chemical class 0.000 claims description 11
- 238000000034 method Methods 0.000 abstract description 6
- 230000008901 benefit Effects 0.000 abstract description 4
- 230000005764 inhibitory process Effects 0.000 description 6
- 230000003071 parasitic effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
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- 238000004519 manufacturing process Methods 0.000 description 1
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Abstract
A kind of control circuit inhibiting the oscillation of phase-shifting full-bridge secondary-side voltage, includes at least rectifier bridge, transformation mechanism, active-clamp driving circuit and active clamping circuir；Wherein transformation mechanism includes: resonant inductor Lr, and one end of resonant inductor Lr is connect with rectifier bridge；The primary coil Lm of transformer, transformer is connect with the other end of resonant inductor Lr, and the secondary side of transformer is connect with active-clamp driving circuit and active clamping circuir respectively；The output end of active-clamp driving circuit is connect with active clamping circuir.Compared with prior art, the utility model inhibits the control circuit of phase-shifting full-bridge secondary-side voltage oscillation to have the advantage that reduction circuit cost；Traditional primary side can be overcome to add the method for diode clamp that can only clamp the oscillation generated by additional resonant inductor and rectification junction capacitance, and the problem of transformer leakage inductance cannot be inhibited and rectify the oscillation that junction capacitance generates, and loss of the resonant energy on primary loop is eliminated, improve the efficiency of system.
Description
Technical field
The utility model relates to electricity field more particularly to switching power source control circuit, especially a kind of inhibition phase shift is complete
The control circuit of bridge secondary-side voltage oscillation.
Background technique
Compared with traditional power supply, Switching Power Supply has the advantages that small in size, light-weight, high-efficient, working frequency is high, because
This gets more and more people's extensive concerning and generally studies.In field of switch power, phase-shifted full-bridge converter is in middle high-power applications
Occasion is favored by everybody.Wherein the leakage inductance of transformer can be used as resonant inductor generated with power tube parasitic capacitance it is humorous
Vibration, may be implemented switch tube zero voltage switch, effectively improves the conversion efficiency of full-bridge phase-shifted topology.
But due to primary side transformer leakage inductance or resonant inductor and parasitic capacitance and secondary side rectifier diode
The oscillation of phase whole-bridging circuit secondary-side voltage caused by parasitic parameter and due to voltage spikes, it will serious electromagnetic interference is generated, and
Increase the voltage stress and conduction loss of rectifier diode.In order to reduce these detrimental effects, people are used in primary side
The mode for adding clamp diode between resonant inductor and transformer, reduces the oscillation of primary side.
However, primary side adds the mode of clamp diode to can be only applied to the topological structure of individual resonant inductor,
It is not suitable for the topological structure that resonant inductor and main transformer integrate, and there are duty-cycle loss, soft-switching ranges to narrow,
Primary side adds circulation loss caused by clamp diode etc., affects the promotion of full-bridge phase-shifted topology efficiency.
Utility model content
For the defects in the prior art, the utility model aim is to provide a kind of inhibition for solving above-mentioned technical problem
The control circuit of phase-shifting full-bridge secondary-side voltage oscillation.
In order to solve the above technical problems, the utility model provides a kind of control of inhibition phase-shifting full-bridge secondary-side voltage oscillation
Circuit includes at least rectifier bridge, transformation mechanism, active-clamp driving circuit and active clamping circuir；Wherein
The transformation mechanism includes:
Resonant inductor Lr, one end of the resonant inductor Lr are connect with the rectifier bridge；
Transformer, the primary coil Lm of the transformer are connect with the other end of the resonant inductor Lr, the transformation
The secondary side of device is connect with the active-clamp driving circuit and the active clamping circuir respectively；
The output end of the active-clamp driving circuit is connect with the active clamping circuir.
The active-clamp driving circuit includes:
The input terminal of driving unit, the driving unit is connect with driving single-chip microcontroller；
Comparison amplifier U2, the input terminal of the comparison amplifier U2 are connect with the secondary side of the transformation mechanism；
Driving chip, the input terminal of the driving chip respectively with the output end of the driving unit and it is described compared with amplify
The output end of device U2 connects, and the output end of the driving chip is connect with the active clamping circuir.
The driving unit includes:
Driving amplifier U1, the normal phase input end of the driving amplifier U1 are connect with the driving single-chip microcontroller, the drive
The inverting input terminal of dynamic amplifier U1 is connect with digital power, output end and the driving chip of the driving amplifier U1
Input terminal connection.
The normal phase input end of the comparison amplifier U2 is connect with the secondary side of the transformation mechanism, the comparison amplifier U2
Inverting input terminal connect to power supply, the output end of the comparison amplifier U2 is connect with the input terminal of the driving chip.
The active clamping circuir includes:
The enhanced metal-oxide half field effect transistor of N-channel, the grid of the enhanced metal-oxide half field effect transistor of N-channel and institute
State the output end connection of driving chip, source electrode and the transformation mechanism of the enhanced metal-oxide half field effect transistor of N-channel
Secondary side connection, the drain electrode of the enhanced metal-oxide half field effect transistor of N-channel are grounded by clamping capacitance C.
Compared with prior art, the utility model inhibits the control circuit of phase-shifting full-bridge secondary-side voltage oscillation to have following
Advantage: circuit cost is reduced；The method that traditional primary side can be overcome to add diode clamp can only be clamped by additional resonance
The oscillation that inductor and rectification junction capacitance generate, and transformer leakage inductance cannot be inhibited and rectify the oscillation that junction capacitance generates
Problem, and loss of the resonant energy on primary loop is eliminated, improve the efficiency of system.
Detailed description of the invention
Upon reading the detailed description of non-limiting embodiments with reference to the following drawings, other spies of the utility model
Sign objects and advantages will become more apparent upon.
Fig. 1 is the principles of the present invention block diagram.
Fig. 2 is the functional block diagram of the active-clamp driving circuit of the utility model.
Fig. 3 is the active-clamp driving circuit timing diagram of the utility model.
Specific embodiment
The utility model is described in detail combined with specific embodiments below.Following embodiment will be helpful to this field
Technical staff further understands the utility model, but does not limit the utility model in any form.It should be pointed out that ability
For the those of ordinary skill in domain, without departing from the concept of the premise utility, several changes and improvements can also be made.
The utility model is inhibited by the way of active-clamp due to primary side resonant inductor and parasitic capacitance and secondary
Phase whole-bridging circuit secondary-side voltage caused by the parasitic parameter of grade side rectifier diode vibrates.The circuit is mainly organized as 1) humorous
The transformation mechanism 1 that the inductor Lr and main transformer Lm that shakes is integrated；2) active-clamp driving circuit 2；3) active clamping circuir 3.Its
In, the key of the utility model is the control sequential of active-clamp driving circuit 2, i.e. the controlling party of active-clamp driving circuit 2
Method.Using this method, solve the problems, such as other inhibit secondary-side voltages oscillation method exist, it can be achieved that main transformer with it is humorous
Shake the integrated of inductor, advantageously reduces cost, meets the requirement of inexpensive Switching Power Supply.
As shown in Figure 1 and Figure 2, the utility model provides a kind of control circuit of inhibition phase-shifting full-bridge secondary-side voltage oscillation,
Including at least rectifier bridge 4, transformation mechanism 1, active-clamp driving circuit 2 and active clamping circuir 3.
Active-clamp driving circuit 2 includes driving unit, comparison amplifier U2 and driving chip 5.Wherein
Active_clamp_DRV is the active clamp control signal for driving single-chip microcontroller to issue, the positive of driving amplifier U1
Input terminal is connect with driving single-chip microcontroller, and the inverting input terminal of driving amplifier U1 is connect with digital power, driving amplifier U1's
Output end is connect with the input terminal of driving chip 5.
The normal phase input end of comparison amplifier U2 is connect with the secondary side of transformation mechanism 1, and it is centre tapped to receive transformation mechanism 1
The inverting input terminal of voltage signal TSM, comparison amplifier U2 connect to power supply, the output end and driving chip of comparison amplifier U2
5 input terminal connection.
The two signals using line and by the way of carry out operation after, obtain actual active-clamp driving signal through overdriving
Chip 5 drives active clamping circuir 3, realizes active-clamp function.
The transformation mechanism 1 that resonant inductor Lr and main transformer Lm is integrated, the production method is as follows:
When main transformer coiling, deliberately increase the distance between primary coil and secondary coil, makes primary coil and secondary
The distance between coil farther out, should not be too close when coiling, reduces the coupling between main transformer primary coil and secondary coil,
To generate biggish leakage inductance.Using the leakage inductance of main transformer as resonant inductor Lr, resonant inductor Lr and main transformer are realized
Depressor integrates.
Active clamping circuir 3, active clamping circuir 3 is by an enhanced metal-oxide half field effect transistor of N-channel (NMOSFET)
It being formed with a clamping capacitance C, the grid of the enhanced metal-oxide half field effect transistor of N-channel is connect with the output end of driving chip 5,
The source electrode of the enhanced metal-oxide half field effect transistor of N-channel is connect with the secondary side of transformation mechanism 1, the enhanced OH of N-channel
The drain electrode of transistor passes through capacity earth.The shutdown of opening that NMOSFET is controlled by active-clamp driving circuit 2 is realized secondary
The inhibition of side voltage oscillation.Particularly, clamping capacitance C and resonant inductor Lr row at resonant tank resonance frequency it is remote small
In the switching frequency fsw of phase-shifting full-bridge.I.e.
Capacitance of the C for resonant capacitance, the inductance value of Lr resonant inductor Lr, C meet:
Active-clamp driving circuit 2 includes Active_clamp_DRV drive part and TSM signal processing.Wherein,
The driving signal of Active_clamp_DRV drive part is generated by driving single-chip microcontroller, TSM signal processing according to it is current when
The centre cap output voltage for carving transformation mechanism 1 determines the height of the section output levels.Active_clamp_DRV driving portion
Point and TSM signal processing line and by way of, generation active-clamp driving signal, driven by driving chip 5 active
Clamp circuit 3.
The driving signal of Active_clamp_DRV drive part is generated by driving single-chip microcontroller, and specific timing is referring to Fig. 3's
The timing of VAC.Through figure three as can be seen that at the beginning of primary side driving signal Qb, Qc or Qa, Qd are simultaneously high level
It carving, Active_clamp_DRV driving signal VAC becomes high level, two after Qb, Qc or Qa, Qd are high level simultaneously/
One moment, Active_clamp_DRV driving signal VAC become low level.To obtain the driving of Active_clamp_DRV
Signal waveform is the VAC driver' s timing in figure three.
TSM signal processing determines that the part exports according to the centre cap output voltage of current time transformation mechanism 1
The height of level, the timing of TSM signal processing output level are shown in the Vrec timing diagram in Fig. 3.
After obtaining the timing of Active_clamp_DRV driving signal and the output timing of TSM signal processing, by two
A signal using line and by the way of carry out operation, so that it may obtain active-clamp driving signal, driven by driving chip 5 active
Clamp circuit 3 realizes the inhibition of phase-shifting full-bridge secondary-side voltage oscillation.
Specific embodiment of the utility model is described above.It is to be appreciated that the utility model not office
It is limited to above-mentioned particular implementation, those skilled in the art can make a variety of changes or modify within the scope of the claims,
This has no effect on the substantive content of the utility model.In the absence of conflict, the spy in embodiments herein and embodiment
Sign can be arbitrarily combined with each other.
Claims (5)
1. a kind of control circuit for inhibiting the oscillation of phase-shifting full-bridge secondary-side voltage, which is characterized in that include at least rectifier bridge, transformation
Mechanism, active-clamp driving circuit and active clamping circuir；Wherein
The transformation mechanism includes:
Resonant inductor Lr, one end of the resonant inductor Lr are connect with the rectifier bridge；
Transformer, the primary coil Lm of the transformer are connect with the other end of the resonant inductor Lr, the transformer
Secondary side is connect with the active-clamp driving circuit and the active clamping circuir respectively；
The output end of the active-clamp driving circuit is connect with the active clamping circuir.
2. the control circuit according to claim 1 for inhibiting the oscillation of phase-shifting full-bridge secondary-side voltage, which is characterized in that described
Active-clamp driving circuit includes:
The input terminal of driving unit, the driving unit is connect with driving single-chip microcontroller；
Comparison amplifier U2, the input terminal of the comparison amplifier U2 are connect with the secondary side of the transformation mechanism；
Driving chip, the input terminal of the driving chip respectively with the output end of the driving unit and the comparison amplifier U2
Output end connection, the output end of the driving chip connect with the active clamping circuir.
3. the control circuit according to claim 2 for inhibiting the oscillation of phase-shifting full-bridge secondary-side voltage, which is characterized in that described
Driving unit includes:
Driving amplifier U1, the normal phase input end of the driving amplifier U1 are connect with the driving single-chip microcontroller, and the driving is put
The inverting input terminal of big device U1 is connect with digital power, the input of the output end and the driving chip of the driving amplifier U1
End connection.
4. the control circuit according to claim 2 for inhibiting the oscillation of phase-shifting full-bridge secondary-side voltage, which is characterized in that
The normal phase input end of the comparison amplifier U2 is connect with the secondary side of the transformation mechanism, and the comparison amplifier U2's is anti-
Phase input terminal connects to power supply, and the output end of the comparison amplifier U2 is connect with the input terminal of the driving chip.
5. the control circuit according to claim 2 for inhibiting the oscillation of phase-shifting full-bridge secondary-side voltage, which is characterized in that described
Active clamping circuir includes:
The enhanced metal-oxide half field effect transistor of N-channel, the grid of the enhanced metal-oxide half field effect transistor of N-channel and the drive
The output end connection of dynamic chip, the source electrode of the enhanced metal-oxide half field effect transistor of N-channel and the secondary side of the transformation mechanism
Connection, the drain electrode of the enhanced metal-oxide half field effect transistor of N-channel are grounded by clamping capacitance C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821065257.5U CN208445482U (en) | 2018-07-06 | 2018-07-06 | Inhibit the control circuit of phase-shifting full-bridge secondary-side voltage oscillation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821065257.5U CN208445482U (en) | 2018-07-06 | 2018-07-06 | Inhibit the control circuit of phase-shifting full-bridge secondary-side voltage oscillation |
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| Publication Number | Publication Date |
|---|---|
| CN208445482U true CN208445482U (en) | 2019-01-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821065257.5U Withdrawn - After Issue CN208445482U (en) | 2018-07-06 | 2018-07-06 | Inhibit the control circuit of phase-shifting full-bridge secondary-side voltage oscillation |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108712082A (en) * | 2018-07-06 | 2018-10-26 | 华域汽车电动系统有限公司 | A kind of control circuit inhibiting the oscillation of phase-shifting full-bridge secondary-side voltage |
| CN109921649A (en) * | 2019-03-28 | 2019-06-21 | 苏州汇川联合动力系统有限公司 | A kind of bridge-type DC converter |
| CN110719019A (en) * | 2019-09-29 | 2020-01-21 | 广州金升阳科技有限公司 | Secondary active clamping control circuit |
-
2018
- 2018-07-06 CN CN201821065257.5U patent/CN208445482U/en not_active Withdrawn - After Issue
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108712082A (en) * | 2018-07-06 | 2018-10-26 | 华域汽车电动系统有限公司 | A kind of control circuit inhibiting the oscillation of phase-shifting full-bridge secondary-side voltage |
| CN108712082B (en) * | 2018-07-06 | 2024-02-06 | 华域汽车电动系统有限公司 | Control circuit for inhibiting phase-shifting full-bridge secondary side voltage oscillation |
| CN109921649A (en) * | 2019-03-28 | 2019-06-21 | 苏州汇川联合动力系统有限公司 | A kind of bridge-type DC converter |
| CN110719019A (en) * | 2019-09-29 | 2020-01-21 | 广州金升阳科技有限公司 | Secondary active clamping control circuit |
| CN110719019B (en) * | 2019-09-29 | 2021-05-18 | 广州金升阳科技有限公司 | Secondary active clamping control circuit |
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Granted publication date: 20190129 Effective date of abandoning: 20240206 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20190129 Effective date of abandoning: 20240206 |
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| AV01 | Patent right actively abandoned |