CN206698107U - The active clamp circuit of DC/DC converters - Google Patents
The active clamp circuit of DC/DC converters Download PDFInfo
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- CN206698107U CN206698107U CN201720406872.7U CN201720406872U CN206698107U CN 206698107 U CN206698107 U CN 206698107U CN 201720406872 U CN201720406872 U CN 201720406872U CN 206698107 U CN206698107 U CN 206698107U
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- absorption capacitance
- driver
- voltage
- converters
- clamp circuit
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Abstract
The utility model provides a kind of active clamp circuit of DC/DC converters, including the first diode, the second diode, the first Absorption Capacitance, the second Absorption Capacitance, switching device, comparison module and driver；First diode, one end of the converter vice-side winding is connected to, is charged for first Absorption Capacitance；Second diode, the other end of the converter vice-side winding is connected to, is charged for second Absorption Capacitance；The comparison module, in the case where the voltage of first Absorption Capacitance and the second Absorption Capacitance exceeds setting value, the driver is driven to work；The driver, by driving work in the case of, the voltage of output is adjusted according to pwm signal, and controls the break-make of the switching device；The switching device, driven and turn on by the driver, so as to by the voltage output of first Absorption Capacitance and the second Absorption Capacitance；First Absorption Capacitance is mutually in parallel with the second Absorption Capacitance.
Description
Technical field
The present invention relates to DC/DC converters, more particularly to a kind of active clamp circuit of DC/DC converters.
Background technology
The vehicle-mounted DC/DC converters of EV/HEV are to realize the conversion assembling device that high-tension battery charges to low-voltage-powered battery,
Power grade is typically between 1KW~3KW.High-tension battery voltage power supply scope typically has two kinds, for have 100V~200V and
Between 200V~430V, high-tension battery voltage causes voltage range fluctuation wider with SOC state changes；And A-battery inputs
It is general stable between 11V~16V.Matched according to power grade and DC/DC overall performances with vehicle, general topology selection moves
FSFB ZVS PWM DC/DC converters or LLC.LLC needs larger gain to meet in the case where input voltage is relatively low
DC/DC output voltage, circuit performance are not easy to optimize, and generally require by prime voltage stabilizing to make up, increase main circuit control journey
Degree and cost.FSFB ZVS PWM DC/DC converters equally have the characteristics of working frequency is high, and transducer effciency is excellent, and can
To meet the vehicle-mounted DC/DC designs of wide input voltage range, main circuit structure is simple, easy to control.
But traditional FSFB ZVS PWM DC/DC converter secondary commutation diodes or synchronous rectification MOSFET shut-off
When can produce very big due to voltage spikes.The due to voltage spikes Producing reason mainly by the anti-phase recovery characteristics of device and resonant inductance/
Transformer leakage inductance and diode or MOSFET parasitic capacitances resonance and it is caused.The due to voltage spikes can cause device loss to increase
Add, the problem of influenceing device lifetime and bring harsh electromagnetic interference.
The content of the invention
In order to solve the part or all of of above-mentioned technical problem, the invention provides a kind of DC/DC converters
Active clamp circuit, including the first diode, the second diode, the first Absorption Capacitance, the second Absorption Capacitance, switching device, ratio
Compared with module and driver；
First diode, one end of the converter vice-side winding is connected to, is charged for first Absorption Capacitance；
Second diode, the other end of the converter vice-side winding is connected to, is charged for second Absorption Capacitance；
The comparison module, exceed the situation of setting value in the voltage of first Absorption Capacitance and the second Absorption Capacitance
Under, drive the driver to work；
The driver, by driving work in the case of, according to pwm signal adjust output voltage, and control described in open
Close the break-make of device；
The switching device, driven and turn on by the driver, so as to which first Absorption Capacitance and second are absorbed into electricity
The voltage output of appearance
First Absorption Capacitance is mutually in parallel with the second Absorption Capacitance.
Optionally, the active clamp circuit of described DC/DC converters also includes microcontroller, the microcontroller foundation
The size output pwm signal of output current and/or output voltage is to the driver.
Optionally, the active clamp circuit of described DC/DC converters also includes the first resistor and second being mutually in series
Resistance, the both ends of the first resistor and second resistance are parallel to first Absorption Capacitance and the second Absorption Capacitance, the ratio
An input compared with module is terminated between the first resistor and second resistance, another input access reference voltage, institute
The output end for stating comparison module is connected to the driver.
Optionally, the comparison module uses hysteresis analog comparator.
Optionally, the switching device uses FET, and the grid of the FET connects the driver, described
The source electrode of FET connects first Absorption Capacitance and the second Absorption Capacitance, the drain electrode output voltage of the FET.
Optionally, the active clamp circuit of described DC/DC converters also includes the filtered electrical for being connected to the switching device
Sense.
In the present invention, energy caused by depressor leakage inductance or resonant inductance absorbs electricity by two clamp diodes to first
Hold and the second Absorption Capacitance charges, after voltage exceedes setting value on Absorption Capacitance, pass through mould comparison module and produce enable signal
Drive driver normal work.Now the voltage on Absorption Capacitance is transferred to vehicle-mounted DC/DC output ends by first switch device,
Voltage on output end load consumption electric capacity, resets Absorption Capacitance.
Brief description of the drawings
Fig. 1 is the schematic diagram of the active clamp circuit of DC/DC converters in an alternate embodiment of the present invention.
Embodiment
Detailed retouch is carried out to the active clamp circuit of DC/DC converters provided by the utility model below with reference to Fig. 1
State, it is optional embodiment of the present invention, it is believed that those skilled in the art are not changing the model of spirit and content of the invention
In enclosing, it is modified and polished.
The invention provides a kind of active clamp circuit of DC/DC converters, including the first diode D1, the second diode
D2, the first Absorption Capacitance C3, the second Absorption Capacitance C4, switching device, comparison module and driver Driver；
The first diode D1, one end of the converter vice-side winding is connected to, is filled for the first Absorption Capacitance C3
Electricity；
The second diode D2, the other end of the converter vice-side winding is connected to, is the second Absorption Capacitance C4
Charging；
The comparison module, exceed the feelings of setting value in the first Absorption Capacitance C3 and the second Absorption Capacitance C4 voltage
Under condition, the driver Driver is driven to work；
The driver, by driving work in the case of, according to pwm signal adjust output voltage, and control described in open
Close the break-make of device；
The switching device, driven and turn on by the driver, so as to which the first Absorption Capacitance C3 and second be absorbed
Electric capacity C4 voltage output
The first Absorption Capacitance C3 is mutually in parallel with the second Absorption Capacitance C4.
In one of which embodiment, the active clamp circuit of described DC/DC converters also includes microcontroller, described
Microcontroller is according to the size output pwm signal of output current and/or output voltage to the driver.Pwm signal is sent out by MCU
Go out, and PWM Duty sizes are adjusted according to output current.It is according to DC/DC output currents by software adjustment PWM Duty sizes
Size/input voltage height.Because input voltage is higher, output current is bigger, and energy is bigger caused by leakage inductance, now needs more
Big dutycycle puts the voltage on Absorption Capacitance toward load end, if dutycycle is too small, Absorption Capacitance voltage can be caused to continue
Increase and can not reset, ultimately result in maximum operating range of the rectifying device voltage stress more than device and cause component failure.
In one of which embodiment, the active clamp circuits of described DC/DC converters also include mutually being in series the
One resistance R3 and second resistance R4, the first resistor R3 and second resistance R4 both ends are parallel to the first Absorption Capacitance C3
With the second Absorption Capacitance C4, an input of the comparison module is terminated between the first resistor R3 and second resistance R4,
Another input accesses reference voltage Vref, the output end of the comparison module is connected to the driver.The comparison module
Using hysteresis analog comparator,
In one of which embodiment, the switching device uses FET Q_Buck, the FET Q_Buck
Grid connect the driver, the source electrode of the FET Q_Buck connects the first Absorption Capacitance C3 and second and absorbed
Electric capacity C4, the drain electrode output voltage of the FET Q_Buck.Control signal depends primarily on the output of hysteresis loop comparator, rings
Speed is answered, Absorption Capacitance voltage will not be made because of overdischarge so as to cause transformer secondary short circuit phenomenon.
In one of which embodiment, the active clamp circuit of described DC/DC converters also includes being connected to the switch
The filter inductance L_buck of device.
Operating circuit is described as follows：Energy caused by transformer leakage inductance or resonant inductance passes through clamp diode, i.e.,
One diode D1 and the second diode D2 charges to the first Absorption Capacitance C3 and the second Absorption Capacitance C4, when voltage on Absorption Capacitance
After setting value, an Enb signal is produced by analog comparator and gives driver normal work.The now electricity on Absorption Capacitance
Pressure is transferred to vehicle-mounted DC/DC output ends, output end load consumption electric capacity by FET Q_Buck and filter inductance L_buck
Upper voltage, resets Absorption Capacitance.
In the specific embodiment of the invention, in order to which under any operating mode, vehicle-mounted DC/DC converters can effectively absorb pair
Side rectifying device voltage stress, absorbing circuit control is simple, and reduces PCB volumes and improve DC/DC efficiency.The present invention is optional
The clamp circuit combination FSFB full-wave rectification converter features that scheme is related to, without with main circuit switch sequential coupling, Ke Yidan
A module is solely made, integrated level is high, can effectively absorb transformer leakage inductance, resonant inductance energy and the anti-phase recovery energy of device
Amount.Innovation point is mainly reflected in numeral and is combined simultaneously multistage control active absorption circuit with simulation, and circuit is that work can
With in " open loop " pattern, and " closed loop " pattern can be operated in simultaneously, hardware and software simultaneously participate in control, response speed compared with
It hurry up, reliability is higher.
" open loop " pattern refers to active clamp circuit discharge power than being fixed, discharge power in certain loading range
Size depends on the dutycycle size of discharge circuit；" closed loop " pattern refers to that whether active clamp circuit works and determined by hardware circuit
It is fixed, and software can make active clamp circuit according to load current and the discharge power of input voltage regulation active clamp circuit
Work be in optimization model, i.e., while clamping effect is excellent the loss of circuit can be preferably minimized.
Alternative of the present invention can also have the advantages that：
1), using active clamp scheme can reduce because passive absorption band come clamp capacitor loss it is excessive the drawbacks of, and
Clamping effect is better than passive absorption；
2), active clamp control signal is using simulation hysteresis comparison circuit, has that control accuracy is high, fast excellent of dynamic response
Point；Along with software adjustment discharge power size, the loss of clamp circuit can be effectively reduced；
3), operating mode loads during vehicle-mounted DC/DC operations, larger to the impact of secondary rectifying device when DC/DC starts shooting, can be effective
Respond and by rectifying device clamper in the operating voltage range of safety.
4), can effectively solve the problems, such as that large power supply secondary rectifying device voltage stress is too high, and reduce RC or
RCD resistance losses, improve DC/DC whole efficiencies；Be advantageous to DC/DC higher frequencies, miniaturization；
5), independently of the active clamp circuit of main circuit, main circuit work schedule, clamp circuit control letter can be mismatched
It is single effective, it can be transplanted in a variety of DC/DC topological circuits.
In summary, in the present invention, energy caused by depressor leakage inductance or resonant inductance passes through two clamp diodes pair
First Absorption Capacitance and the charging of the second Absorption Capacitance, after voltage exceedes setting value on Absorption Capacitance, are produced by mould comparison module
Raw enable signal driving driver normal work.Now the voltage on Absorption Capacitance is transferred to vehicle-mounted by first switch device
DC/DC output ends, voltage on output end load consumption electric capacity, reset Absorption Capacitance.
Claims (6)
- A kind of 1. active clamp circuit of DC/DC converters, it is characterised in that：Including the first diode, the second diode, first Absorption Capacitance, the second Absorption Capacitance, switching device, comparison module and driver；First diode, one end of the converter vice-side winding is connected to, is charged for first Absorption Capacitance；Second diode, the other end of the converter vice-side winding is connected to, is charged for second Absorption Capacitance；The comparison module, in the case where the voltage of first Absorption Capacitance and the second Absorption Capacitance exceeds setting value, drive The dynamic driver work；The driver, by driving work in the case of, the voltage of output is adjusted according to pwm signal, and controls the derailing switch The break-make of part；The switching device, driven and turn on by the driver, so as to by first Absorption Capacitance and the second Absorption Capacitance Voltage output；First Absorption Capacitance is mutually in parallel with the second Absorption Capacitance.
- 2. the active clamp circuit of DC/DC converters as claimed in claim 1, it is characterised in that：Also include microcontroller, institute Microcontroller is stated according to the size output pwm signal of output current and/or output voltage to the driver.
- 3. the active clamp circuit of DC/DC converters as claimed in claim 1, it is characterised in that：Also include what is be mutually in series First resistor and second resistance, the both ends of the first resistor and second resistance are parallel to first Absorption Capacitance and second and inhaled Electric capacity is received, an input of the comparison module is terminated between the first resistor and second resistance, another input termination Enter reference voltage, the output end of the comparison module is connected to the driver.
- 4. the active clamp circuit of DC/DC converters as claimed in claim 1, it is characterised in that：The comparison module uses Hysteresis analog comparator.
- 5. the active clamp circuit of DC/DC converters as claimed in claim 1, it is characterised in that：The switching device uses FET, the grid of the FET connect the driver, and the source electrode connection described first of the FET absorbs Electric capacity and the second Absorption Capacitance, the drain electrode output voltage of the FET.
- 6. the active clamp circuit of DC/DC converters as claimed in claim 1, it is characterised in that：Also include being connected to described open Close the filter inductance of device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720406872.7U CN206698107U (en) | 2017-04-18 | 2017-04-18 | The active clamp circuit of DC/DC converters |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720406872.7U CN206698107U (en) | 2017-04-18 | 2017-04-18 | The active clamp circuit of DC/DC converters |
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| Publication Number | Publication Date |
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| CN206698107U true CN206698107U (en) | 2017-12-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720406872.7U Withdrawn - After Issue CN206698107U (en) | 2017-04-18 | 2017-04-18 | The active clamp circuit of DC/DC converters |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107425706A (en) * | 2017-04-18 | 2017-12-01 | 上海逸伏汽车电子科技有限公司 | The active clamp circuit of DC/DC converters |
-
2017
- 2017-04-18 CN CN201720406872.7U patent/CN206698107U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107425706A (en) * | 2017-04-18 | 2017-12-01 | 上海逸伏汽车电子科技有限公司 | The active clamp circuit of DC/DC converters |
| CN107425706B (en) * | 2017-04-18 | 2023-05-05 | 刘孝涛 | Active clamp circuit of DC/DC converter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: SHENZHEN V&T TECHNOLOGIES Co.,Ltd. Assignor: SHANGHAI YIFU AUTOMOTIVE ELECTRONICS TECHNOLOGY CO.,LTD. Contract record no.: X2019440020010 Denomination of utility model: Active clamp circuit of DC/DC converter Granted publication date: 20171201 License type: Common License Record date: 20190911 |
|
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20191120 Address after: Room 2, No. 495, Tongji New Village, Zhangwu Road, Yangpu District, Shanghai 200092 Patentee after: Liu Xiaotao Address before: 201203, Room 401, block E, 501 Jingang Road, Shanghai, Pudong New Area Patentee before: SHANGHAI YIFU AUTOMOTIVE ELECTRONICS TECHNOLOGY CO.,LTD. |
|
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20171201 Effective date of abandoning: 20230505 |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20171201 Effective date of abandoning: 20230505 |