CN207559857U - A kind of high voltage inputs soft switch BUCK circuit - Google Patents
A kind of high voltage inputs soft switch BUCK circuit Download PDFInfo
- Publication number
- CN207559857U CN207559857U CN201721572419.XU CN201721572419U CN207559857U CN 207559857 U CN207559857 U CN 207559857U CN 201721572419 U CN201721572419 U CN 201721572419U CN 207559857 U CN207559857 U CN 207559857U
- Authority
- CN
- China
- Prior art keywords
- diode
- capacitance
- switching tube
- circuit
- anode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Dc-Dc Converters (AREA)
- Rectifiers (AREA)
Abstract
The utility model is related to a kind of high voltages to input soft switch BUCK circuit,Including main power BUCK circuits,Auxiliary no-voltage opens circuit and auxiliary zero voltage turn-off circuit,The main power BUCK circuits include switching tube M1,The grid of the switching tube M1 is connected with control circuit,Its drain electrode is connected with the anode of diode D1,Its source electrode is grounded,The cathode of the diode D1 is connected with positive pole,The plus earth of diode D6,The cathode of diode D6 is connected with the drain of switching tube M1,The capacitance C5 is connected in parallel on the both ends of diode D6,One end of inductance L1 is connect with the anode of diode D1,The other end of inductance L1 is connect with loading the negative pole end of R1,Capacitance C2 is connected in parallel on the both ends of load R1,One end of capacitance C1 is connected with positive pole,The other end ground connection of capacitance C1.The utility model can make master power switch pipe be operated in no-voltage open with zero voltage turn-off state, improve the reliability of power device.
Description
Technical field
The utility model is related to switch power technology fields, and in particular to a kind of high voltage inputs soft switch BUCK circuit.
Background technology
Switching Power Supply and DC/DC converters as secondary system power supply be widely used in space flight, aviation, ship, weapons,
In the military-civil electronic system such as electronics, railway, communication, medical electronics, industrial automation equipment.With electronic system complexity
Raising, the demand of power-supply system power supply capacity is continuously increased, in order to reduce the weight of connection cable inside machine system
And volume, while reducing line loss, more and more machine systems use the power supply mode of 180V~375V high voltages input.
High voltage input switch power supply need to use high-voltage power MOSFET, high voltage power diode device, high-voltage MOSFET
Conducting resistance and gate charge it is all larger, the reverse recovery characteristic of high-voltage diode is poor.As switching frequency improves, high pressure
The switching loss of MOSFET drastically becomes larger, and conduction loss caused by excessive conducting resistance can not become smaller, and leads to switching frequency
Limited, magnetic device volume is limited, and then causes power-efficient that can not improve, and power supply reliability reduces；High-voltage diode is serious
Reverse recovery characteristic can also generate very high electric stress, generate more thermal losses, and then influence power device reliability, and
EMI is made to become severe.
Utility model content
The purpose of this utility model is to provide a kind of high voltages to input soft switch BUCK circuit, makes master power switch plumber
Make no-voltage open with zero voltage turn-off state, improve the reliability of power device.
To achieve the above object, the utility model employs following technical scheme：
A kind of high voltage inputs soft switch BUCK circuit, is connected including main power BUCK circuits and with main power BUCK circuits
Auxiliary no-voltage open circuit and auxiliary zero voltage turn-off circuit, the main power BUCK circuits include switching tube M1, two poles
Pipe D1, D6, capacitance C1, C2, C5 and inductance L1, the grid of the switching tube M1 are connected with control circuit, drain electrode and diode
The anode of D1 is connected, and source electrode ground connection, the cathode of the diode D1 is connected with positive pole, and the anode of the diode D6 connects
Ground, cathode are connected with the drain of switching tube M1, and the capacitance C5 is connected in parallel on the both ends of diode D6, one end of the inductance L1
It is connect with the anode of diode D1, the other end is connect with loading the negative pole end of R1, and the capacitance C2 is connected in parallel on the two of load R1
End, one end of the capacitance C1 are connected with positive pole, other end ground connection.
Further, the auxiliary no-voltage opens circuit and includes switching tube M2, diode D2, D5, inductance L2 and capacitance
The drain electrode of C4, the switching tube M2 are connect with auxiliary zero voltage turn-off circuit, source electrode ground connection, grid and control circuit phase
Even, the cathode of the diode D2 is connect with the drain electrode of switching tube M2, and cathode is connect through inductance L2 with the drain electrode of switching tube M1,
The anode of the diode D5 is connected with the source electrode of switching tube M2, and cathode is connect with the drain electrode of switching tube M2, the capacitance C4
It is connected in parallel on the both ends of diode D5.
Further, the auxiliary zero voltage turn-off circuit includes diode D3, D4 and capacitance C3, the diode D3's
Anode is connected with the cathode of diode D4, and cathode is connected with the anode of power supply, anode and zero electricity of auxiliary of the diode D4
It presses off circuit passband to be connected, one end of the capacitance C3 is connect with the anode of diode D3, and the other end is connected to inductance L2 and master
At the connecting node of power BUCK circuits.
As shown from the above technical solution, high voltage input soft switch BUCK circuit described in the utility model, circuit structure
Simply, main power Buck circuit efficiencies, the high voltage larger especially suitable for switching loss input can be greatly improved in easily debugging
Adjusting and voltage-reduction switch power supply.Master power switch pipe be operated in no-voltage open with zero voltage turn-off state, circuit can be greatly improved
Efficiency, and then improve the reliability of power device.
Description of the drawings
Fig. 1 is the circuit diagram of the utility model.
Specific embodiment
The utility model is described further below in conjunction with the accompanying drawings：
As shown in Figure 1, the present embodiment high voltage input soft switch BUCK circuit, including main power BUCK circuits and with master
The auxiliary no-voltage that power BUCK circuits are connected opens circuit and auxiliary zero voltage turn-off circuit, and main power BUCK circuits include opening
Pipe M1, diode D1, D6 are closed, capacitance C1, C2, C5 and inductance L1, the grid of switching tube M1 are connected with control circuit, switching tube M1
Drain electrode be connected with the anode of diode D1, source electrode ground connection, the cathode of diode D1 is connected with positive pole, diode D6's
Plus earth, the cathode of diode D6 are connected with the drain of switching tube M1, and capacitance C5 is connected in parallel on the both ends of diode D6, inductance L1
One end connect with the anode of diode D1, the other end of inductance L1 is connect with loading the negative pole end of R1, and capacitance C2 is connected in parallel on negative
The both ends of R1 are carried, one end of capacitance C1 is connected with positive pole, the other end ground connection of capacitance C1.
When switching tube M1 is connected, inductance L1 starts to store energy in the form of magnetic field, while to output capacitance
C2 charges, and provides load current, and diode D1 is reverse biased and ends.When switching tube M1 ends, inductance L1 polarity top
, diode D1 adds forward bias and is connected, and inductance L1 and output capacitance C2 provide load current when switching tube M1 ends.It is auxiliary
Switching tube M2 control resonant inductance L2 is helped to recycle charge and discharge to resonant capacitance C3 by diode D2, D3 and D4, utilize capacitance C3
The characteristic that the voltage at both ends cannot be mutated realizes that the no-voltage of switching tube M1 turns on and off.
The present embodiment, which opens circuit and includes switching tube M2, diode D2, D5, inductance L2 and capacitance
C4, the auxiliary zero voltage turn-off circuit include diode D3, D4 and capacitance C3；The drain electrode of switching tube M2 and the anode of diode D4
It is connected, the source electrode ground connection of switching tube M2, the grid of switching tube M2 is connected with control circuit, cathode and the switching tube M2 of diode D2
Drain electrode connection, the cathode of diode D2 connect through inductance L2 with the drain electrode of switching tube M1, the anode and switching tube of diode D5
The source electrode of M2 is connected, and the cathode of diode D5 is connect with the drain electrode of switching tube M2, and capacitance C4 is connected in parallel on the both ends of diode D5.Two
The anode of pole pipe D3 is connected with the cathode of diode D4, and the cathode of diode D3 is connected with the anode of power supply, the sun of diode D4
Pole is connect with the drain electrode of switching tube M2, and one end of capacitance C3 is connect with the anode of diode D3, and the other end of capacitance C3 is connected to
At the connecting node of inductance L2 and main power BUCK circuits.
As input power is connected, switching tube M1 start it is open-minded, input power to load resistance R1 provide energy, inductance L1
Electric current starts to increase, resonant inductance L2 current synchronizations increase, when inductance L2 electric currents increase to load current, under A point voltages start
Drop, diode D1 reversely ends, and diode D1 is nature commutation at this time, reverse recovery loss very little；Resonant inductance L2, D2, M2
Forming the discharge loop of junction capacity C5, A point voltages drop to 0 by Vin+0.7V, junction capacity C5 stored energy transfers to resonant inductance L2,
Switching tube M1 is open-minded for no-voltage.Due to resonant capacitance C3（Capacitance requirement is more than 100 times of junction capacity C5 capacitances or more）Presence,
Resonant inductance L2 charges to capacitance C3 by diode D2, D3, when capacitance C3 voltages gradually rise up to Vin+0.7V by 0V, two
Pole pipe D4 is connected, and resonant inductance L2 energy is fully transferred to C3 and load resistance R1, and switching tube M1 is in junction capacity C5 both end voltages
It is turned off during close to 0, is zero voltage turn-off.
The utility model is suitable for 180V-375V high voltages and inputs soft switch BUCK circuit, and master power switch pipe is operated in
No-voltage open with zero voltage turn-off state, circuit efficiency can be greatly improved, and then improve power device reliability.
Embodiment described above is only that the preferred embodiment of the utility model is described, not to this practicality
Novel range is defined, and under the premise of the spirit of the design of the utility model is not departed from, those of ordinary skill in the art are to this
The various modifications and improvement that the technical solution of utility model is made should all fall into the protection that the utility model claims book determines
In the range of.
Claims (3)
1. a kind of high voltage inputs soft switch BUCK circuit, it is characterised in that：Including main power BUCK circuits and with main power
The auxiliary no-voltage that BUCK circuits are connected opens circuit and auxiliary zero voltage turn-off circuit, and the main power BUCK circuits include opening
Pipe M1, diode D1, D6 are closed, capacitance C1, C2, C5 and inductance L1, the grid of the switching tube M1 are connected with control circuit, leak
Pole is connected with the anode of diode D1, and source electrode ground connection, the cathode of the diode D1 is connected with positive pole, the diode
The plus earth of D6, cathode are connected with the drain of switching tube M1, and the capacitance C5 is connected in parallel on the both ends of diode D6, the electricity
One end of sense L1 is connect with the anode of diode D1, and the other end is connect with loading the negative pole end of R1, and the capacitance C2 is connected in parallel on
The both ends of R1 are loaded, one end of the capacitance C1 is connected with positive pole, other end ground connection.
2. high voltage according to claim 1 inputs soft switch BUCK circuit, it is characterised in that：The auxiliary no-voltage is opened
Circuit passband includes switching tube M2, diode D2, D5, drain electrode and the auxiliary no-voltage of inductance L2 and capacitance C4, the switching tube M2
Breaking circuit connects, and source electrode ground connection, grid is connected with control circuit, the cathode of the diode D2 and the leakage of switching tube M2
Pole connects, and cathode is connect through inductance L2 with the drain electrode of switching tube M1, the anode of the diode D5 and the source electrode of switching tube M2
It is connected, cathode is connect with the drain electrode of switching tube M2, and the capacitance C4 is connected in parallel on the both ends of diode D5.
3. high voltage according to claim 1 inputs soft switch BUCK circuit, it is characterised in that：The auxiliary no-voltage is closed
Deenergizing includes diode D3, D4 and capacitance C3, the anode of the diode D3 and is connected with the cathode of diode D4, cathode and
The anode of power supply is connected, and the anode of the diode D4 opens circuit with auxiliary no-voltage and is connected, one end of the capacitance C3 with
The anode connection of diode D3, the other end are connected at the connecting node of inductance L2 and main power BUCK circuits.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721572419.XU CN207559857U (en) | 2017-11-22 | 2017-11-22 | A kind of high voltage inputs soft switch BUCK circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721572419.XU CN207559857U (en) | 2017-11-22 | 2017-11-22 | A kind of high voltage inputs soft switch BUCK circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207559857U true CN207559857U (en) | 2018-06-29 |
Family
ID=62680633
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721572419.XU Active CN207559857U (en) | 2017-11-22 | 2017-11-22 | A kind of high voltage inputs soft switch BUCK circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207559857U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107834851A (en) * | 2017-11-22 | 2018-03-23 | 中国电子科技集团公司第四十三研究所 | A kind of high voltage inputs soft switch BUCK circuit |
-
2017
- 2017-11-22 CN CN201721572419.XU patent/CN207559857U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107834851A (en) * | 2017-11-22 | 2018-03-23 | 中国电子科技集团公司第四十三研究所 | A kind of high voltage inputs soft switch BUCK circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203261235U (en) | High-gain SEPIC converter | |
| CN203942447U (en) | A kind of ZVT crisscross parallel high-gain formula DC/DC converter | |
| CN102946199A (en) | Direct current insulation buck converter and matrix voltage detection circuit thereof | |
| CN103929058B (en) | The control method of the biphase interleaved parallel converter based on coupling inductance | |
| CN203859682U (en) | Low-input current ripple single-switch high-gain converter | |
| CN108183603B (en) | A kind of single-stage is without bridge Sofe Switch resonance isolated form circuit of power factor correction | |
| CN105720817A (en) | PFC soft switching circuit of BOOST circuit | |
| CN103825457A (en) | Quasi-Z-source DC-DC boost converter circuit | |
| CN105939108A (en) | Switch inductor type quasi-switch voltage-boosting DC-DC converter | |
| CN105939112A (en) | High-gain quasi-switch boost DC-DC converter | |
| CN102005920B (en) | Three-level buck type conversion circuit and method | |
| CN202940733U (en) | Direct current insulation buck converter and matrix voltage detection circuit thereof | |
| CN207559857U (en) | A kind of high voltage inputs soft switch BUCK circuit | |
| CN103944399A (en) | Low-input-current-ripple single-switch high-gain converter | |
| CN106787736A (en) | A kind of biswitch high step-up ratio PWM DC converters | |
| CN204696953U (en) | A kind of Z-source inverter being applicable to photovoltaic generation | |
| CN108023471A (en) | A kind of soft upper electric system, equipment and its soft powering method | |
| CN107834851A (en) | A kind of high voltage inputs soft switch BUCK circuit | |
| CN204696955U (en) | A kind of photovoltaic DC-to-AC converter adopting transformer auxiliary resonance | |
| CN103746564A (en) | High-gain active lossless clamping converter including built-in transformer and voltage-multiplying structure | |
| CN103762852B (en) | High-efficiency high-gain DC-DC converter with double coupling inductors | |
| CN203691247U (en) | High-efficiency high-gain DC-DC converter with double coupling inductors | |
| CN206807284U (en) | A kind of non-bridge PFC circuits | |
| CN201839203U (en) | Three-level voltage dropping conversion circuit | |
| CN103647452B (en) | A kind of single tube soft switch BUCK converter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |