CN107070441A - A kind of soft switch circuit of Switching Power Supply - Google Patents
A kind of soft switch circuit of Switching Power Supply Download PDFInfo
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- CN107070441A CN107070441A CN201710178902.8A CN201710178902A CN107070441A CN 107070441 A CN107070441 A CN 107070441A CN 201710178902 A CN201710178902 A CN 201710178902A CN 107070441 A CN107070441 A CN 107070441A
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- resistance
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- circuit
- soft switch
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
- H03K17/687—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being field-effect transistors
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Abstract
A kind of soft switch circuit of Switching Power Supply, including power samples circuit, load current decision circuitry, auxiliary soft switch circuit.Power samples circuit is connected to load current size decision circuitry, and power resistor both end voltage value is read by sample circuit and judges load current size cases.Load current size decision circuitry connection auxiliary underloading Sofe Switch realizes circuit, and by judging that opening auxiliary underloading Sofe Switch realizes circuit to load current size cases, accessory system realizes underloading Sofe Switch state.
Description
Technical field
The present invention relates to power electronics professional domain, a kind of specific involved underloading that solves is difficult to realize soft switch circuit.
Full-load range soft switch circuit principle suitable for Switching Power Supply, frequency converter, driver constant power circuit is realized.
Background technology
With the development of Power Electronic Technique, many fields need to use high power density, efficient Switching Power Supply.Carry
High switching frequency can reduce the volume of transformer, inductance, electric capacity, be that one kind of current Switching Power Supply raising power density becomes
Gesture.But, the raising of switching frequency, the loss of Switching Power Supply is consequently increased.In order to reduce the switching loss of Switching Power Supply, carry
High switching frequency, soft switch technique arises at the historic moment.Resonant type soft-switch can provide ZVT and zero electricity for power device switch
Stream switch.
In order to while circulating energy is not increased, set up the Sofe Switch condition of switch, develop many soft-switch PWM skills
Art.They return to conventional PWM working methods again after using some form of resonant type soft-switch process, switch conversion end,
But its resonant inductance is connected in main circuit, therefore zero Switching Condition is relevant with the excursion of supply voltage, load current,
It is possible to lose Sofe Switch condition under underloading.Due to Sofe Switch can not be realized under light condition, cause power device loss big,
Heating is serious, reduces system reliability.So realizing that Sofe Switch is Switching Power Supply miniaturization high power density in full-load range
The key issue of design.
The conventional underloading that solves realizes that the technological means of Sofe Switch has by increasing dead load at output, and avoidance system is light
Load situation.Due to needing to increase many dead loads, the Sofe Switch under light condition is realized, but in heavy condition due to solid
Fixed load is present, and reduces system effectiveness, increase heating.And increase resonant inductance also by various means, when increasing dead band
Between etc. mode, but the optimization of this mode systematic parameter is complicated, it is difficult to realizes, can also reduce heavy condition resonant type soft-switch and realize effect
Really.
The content of the invention
The technology of the present invention solves problem：Overcome the deficiencies in the prior art, propose a kind of Sofe Switch electricity of Switching Power Supply
Road, solves system light condition and realizes Sofe Switch, reduce switching loss, and influence system reload state whole efficiency is avoided that again.
The technical solution adopted by the present invention is：
A kind of soft switch circuit of Switching Power Supply, including power samples circuit, load current decision circuitry, auxiliary Sofe Switch
Circuit；
Power samples circuit is connected in the power output loop of Switching Power Supply, the load for gathering power output loop
Electric current, the load current signal collected is sent into load current decision circuitry, and load current decision circuitry will be received
The load current signal is compared with predetermined threshold value, so that it is determined that the power output loop is still weighed in light condition
Load state, and by status signal feeding auxiliary soft switch circuit, auxiliary soft switch circuit judges whether according to the status signal
Sofe Switch is realized, if what is received is heavy condition signal, does not aid in realizing Sofe Switch, if what is received believes for light condition
Number, then by aiding in soft switch circuit to realize the Sofe Switch in power output loop.
The power samples circuit includes resistance R1 and electric capacity C3；
Series resistance R1 and electric capacity C3 between the output plus terminal and output negative terminal in power output loop, electric capacity C3 two ends are drawn
Go out to export positive signal and output negative signal；Between the output negative terminal and resistance R1 in power output loop, power samples letter is drawn
Number CS.
Load current decision circuitry includes：Electric capacity C1, C2, resistance R2, R3, R4 and operational amplifier V3；
The output negative signal of power samples circuit is connected to operational amplifier V3 input negative terminal by resistance R2, and power is adopted
Sample signal CS is connected to operational amplifier V3 input positive terminal by resistance R3, and electric capacity C1 is connected in parallel on resistance R2 two ends, and computing is put
Big device V3 input negative terminal is also connected to VCC power supplys by resistance R4, and resistance R2 and R4 carries out partial pressure to VCC power supplys, realizes pre-
If the setting of threshold value；
Operational amplifier V3 input positive terminal is also by the output negative signal of electric capacity C2 connection power samples circuits, and computing is put
Big device V3 output signal is control level signal, and is sent into auxiliary soft switch circuit.
The control level signal is to characterize the state letter that power output loop is in light condition or heavy condition
Number.
Auxiliary soft switch circuit includes：Resistance R5~R10, triode V1 and metal-oxide-semiconductor V2；
The control level signal of load current decision circuitry output is connected to triode V1 base stage by resistance R5, together
When, triode V1 emitter stage is connected to the output negative signal of the power samples circuit, and resistance R7 is connected in parallel on triode V1's
Between base stage and emitter stage；
Triode V1 colelctor electrode by resistance R6 connection VCC power supplys, meanwhile, triode V1 colelctor electrode is also connected to
Metal-oxide-semiconductor V2 grid, metal-oxide-semiconductor V2 source electrode is connected to the output negative signal of the power samples circuit, and resistance R8 is connected in parallel on MOS
Between pipe V2 source electrode and grid；Metal-oxide-semiconductor V2 drain electrode is connected to the power by the resistance R9 and R10 that are connected in parallel and adopted
The output positive signal of sample circuit.
Resistance R9 and R10 are power resistor.The resistance R1 is power samples resistance.
Compared with the prior art, the invention has the advantages that：
(1) a kind of underloading that solves provided by the present invention is difficult to realize soft switch circuit, by surveying in parallel in system output
The mode resistance system light condition of dead load is present, and prevents some underloadings from realizing that soft switch circuit is deposited without light condition
Realizing that whole system full-load range realizes Sofe Switch, to improve heating power device reliability.
(2) present invention reads system power loop band by power samples circuit and load current size decision circuitry and carries shape
State, by the way that to judging that abundant value is set in load current size decision circuitry, whether design system underloading scope and reading system are located
In underloading situation.Flexible control of the invention circuit to system is realized, simple and practical property is strong.
(3) present invention makes system be automatically cut off under case of heavy load defeated by judging system output load current size
Go out side dead load loop, realize that dead load can not work, solve, because dead load is present, to make effect in the case of system reload
Rate is low, reduces caloric value, improves global reliability.
Brief description of the drawings
Fig. 1 soft switch circuit entire block diagrams of the present invention；
Fig. 2 present system power samples circuit theory diagrams；
Fig. 3 present system load current size decision circuitry schematic diagrams；
Fig. 4 present invention auxiliary underloading Sofe Switch realizes circuit theory diagrams；
Embodiment
The present invention will be described below in conjunction with the accompanying drawings.
As shown in figure 1, the present invention proposes a kind of soft switch circuit of Switching Power Supply, including power samples circuit, load
Electric current decision circuitry, auxiliary soft switch circuit, Sofe Switch can not be realized under light condition by solving some soft switch circuits.Power
Sample circuit is connected in the power output loop of Switching Power Supply, the load current for gathering power output loop, will be gathered
To load current signal feeding load current decision circuitry in, load current decision circuitry is by the load current received
Signal is compared with predetermined threshold value, so that it is determined that the power output loop is in light condition or heavy condition, and will
Status signal feeding auxiliary soft switch circuit, aids in soft switch circuit to judge whether to realize Sofe Switch according to the status signal,
If what is received is heavy condition signal, do not aid in realizing Sofe Switch, if receive for light condition signal, by auxiliary
Soft switch circuit is helped to realize the Sofe Switch in power output loop.
The present invention realizes that auxiliary switching power supply power circuit realizes Sofe Switch in light condition, is avoided that again in heavy condition
Lower influence Switching Power Supply overall efficiency, realizes that whole system full-load range realizes Sofe Switch, can to improve heating power device
By property.And simple and practical property is strong.
As shown in Fig. 2 power samples circuit includes resistance R1 and electric capacity C3；The resistance R1 is power samples resistance.
Series resistance R1 and electric capacity C3, electricity between the output plus terminal and output negative terminal in the power output loop in Switching Power Supply
Draw output positive signal and output negative signal in the two ends for holding C3；Between the output negative terminal and resistance R1 in power output loop, draw
Go out power samples signal CS.Resistance R1 is power samples resistance, the feature such as resistance reduced parasitic inductances are small, it is ensured that power resistor not shadow
Switch power supply system whole efficiency is rung, and power attenuation is low when flowing through high current.Collection R1 two ends electricity is ensured by C3 electric capacity
The stability of pressure prevents influence rear end from judging and control circuit erroneous action to ensure that data are reliable.
As shown in figure 3, load current decision circuitry includes：Electric capacity C1, C2, resistance R2, R3, R4 and operational amplifier
V3；
The output negative signal of power samples circuit is connected to operational amplifier V3 input negative terminal by resistance R2, and computing is put
Big device V3 input negative terminal reads R1 both end voltage values in power output loop, and input power sampled signal CS is connected by resistance R3
Operational amplifier V3 input positive terminal is connected to, electric capacity C1 is connected in parallel on resistance R2 two ends, and operational amplifier V3 input negative terminal is also led to
Cross resistance R4 and be connected to VCC power supplys, resistance R2 and R4 carries out partial pressure to VCC power supplys, the setting of predetermined threshold value realized, to determine to bear
Electric current underloading and the heavily loaded decision threshold of heavy duty are carried, it is steady to ensure that operational amplifier V3 input negative terminal gathers signal by electric capacity C1
Property, filter out interference signal and place misoperation；Operational amplifier V3 input positive terminal also passes through electric capacity C2 connection power samples circuits
Output negative signal, the input positive terminal for ensureing operational amplifier V3 by electric capacity C2 gathers signal stationarity, filters out interference signal
Place misoperation.Operational amplifier V3 output signal is control level signal, and is sent into auxiliary soft switch circuit.
Control level signal is to characterize the status signal that power output loop is in light condition or heavy condition.
As shown in figure 4, auxiliary soft switch circuit includes：Resistance R5~R10, triode V1 and metal-oxide-semiconductor V2；Load current
The control level signal of decision circuitry output is connected to triode V1 base stage by resistance R5, meanwhile, triode V1 transmitting
Pole is connected to the output negative signal of the power samples circuit, and resistance R7 is connected in parallel between triode V1 base stage and emitter stage；
The abundant value of triode V1 cut-in voltages can be set by resistance R5 and resistance R7 resistance size, it is ensured that switch reliability.Three poles
Pipe V1 colelctor electrode is by resistance R6 connection VCC power supplys, by R6 to triode V1 collector current current limlitings.Meanwhile, triode
V1 colelctor electrode is also connected to metal-oxide-semiconductor V2 grid, and metal-oxide-semiconductor V2 source electrode is connected to the negative letter of output of the power samples circuit
Number, resistance R8 is connected in parallel between metal-oxide-semiconductor V2 source electrode and grid, and resistance R6 and resistance R8 set metal-oxide-semiconductor V2 to VCC power supplys partial pressure
Grid highest cut-in voltage, is quickly released metal-oxide-semiconductor V2 sources grid voltage by resistance R8；Metal-oxide-semiconductor V2 drain electrode is by being connected in parallel on
Resistance R9 and R10 together is connected to the output positive signal of the power samples circuit.Resistance R9 and R10 are power resistor,
During loop of power circuit light condition, by between resistance R9 and R10 parallel connection and the output plus terminal and output negative terminal in power output loop, advise
Keep away power circuit light condition.
Embodiment：
One embodiment that the present invention is provided, R1 selection resistance 100m Ω power collecting resistance, power resistor R9 and R10
Select power 5W cement lead resistance, resistance R2 selection 0.1K resistance, resistance R4 selection 30K resistance, V1 selection NPN types three pole
Pipe, the low conducting internal resistance NMOS tube of V2 selections, V3 selections LM2904.
Power collecting resistance R1 can be replaced into current transformer and related peripheral device, when flowing through main loop of power circuit electric current
R1 voltage signals can be taken to be amplified after processing when very big in the power samples circuit to collection in feeding load current to sentence
Deenergizing.
Circuit of the present invention is simple, safe and reliable, easy to operate, with low cost, is applicable not only to solution underloading and is difficult to realize
Soft switch circuit, can be also used for other wide fields.
The content not being described in detail in description of the invention belongs to the known technology of those skilled in the art.
Claims (7)
1. a kind of soft switch circuit of Switching Power Supply, it is characterised in that：Including power samples circuit, load current decision circuitry,
Aid in soft switch circuit；
Power samples circuit is connected in the power output loop of Switching Power Supply, the load electricity for gathering power output loop
Stream, the load current signal collected is sent into load current decision circuitry, and load current decision circuitry is by the institute received
State load current signal to be compared with predetermined threshold value, so that it is determined that the power output loop is in light condition or heavy duty
State, and by status signal feeding auxiliary soft switch circuit, auxiliary soft switch circuit judges whether reality according to the status signal
Existing Sofe Switch, if what is received is heavy condition signal, does not aid in realizing Sofe Switch, if what is received believes for light condition
Number, then by aiding in soft switch circuit to realize the Sofe Switch in power output loop.
2. a kind of soft switch circuit of Switching Power Supply according to claim 1, it is characterised in that：The power samples circuit
Including resistance R1 and electric capacity C3；
Series resistance R1 and electric capacity C3 between the output plus terminal and output negative terminal in power output loop, electric capacity C3 two ends draw defeated
Go out positive signal and output negative signal；Between the output negative terminal and resistance R1 in power output loop, power samples signal CS is drawn.
3. a kind of soft switch circuit of Switching Power Supply according to claim 2, it is characterised in that：Load current decision circuitry
Including：Electric capacity C1, C2, resistance R2, R3, R4 and operational amplifier V3；
The output negative signal of power samples circuit is connected to operational amplifier V3 input negative terminal, power samples letter by resistance R2
Number CS is connected to operational amplifier V3 input positive terminal by resistance R3, and electric capacity C1 is connected in parallel on resistance R2 two ends, operational amplifier
V3 input negative terminal is also connected to VCC power supplys by resistance R4, and resistance R2 and R4 carries out partial pressure to VCC power supplys, realizes default threshold
The setting of value；
Operational amplifier V3 input positive terminal also passes through the output negative signal of electric capacity C2 connection power samples circuits, operational amplifier
V3 output signal is control level signal, and is sent into auxiliary soft switch circuit.
4. a kind of soft switch circuit of Switching Power Supply according to claim 3, it is characterised in that：The control level signal
As characterize the status signal that power output loop is in light condition or heavy condition.
5. a kind of soft switch circuit of Switching Power Supply according to claim 3, it is characterised in that：Aid in soft switch circuit bag
Include：Resistance R5~R10, triode V1 and metal-oxide-semiconductor V2；
The control level signal of load current decision circuitry output is connected to triode V1 base stage by resistance R5, meanwhile, three
Pole pipe V1 emitter stage is connected to the output negative signal of the power samples circuit, resistance R7 be connected in parallel on triode V1 base stage and
Between emitter stage；
Triode V1 colelctor electrode by resistance R6 connection VCC power supplys, meanwhile, triode V1 colelctor electrode is also connected to metal-oxide-semiconductor
V2 grid, metal-oxide-semiconductor V2 source electrode is connected to the output negative signal of the power samples circuit, and resistance R8 is connected in parallel on metal-oxide-semiconductor V2
Source electrode and grid between；Metal-oxide-semiconductor V2 drain electrode is connected to the power samples electricity by the resistance R9 and R10 that are connected in parallel
The output positive signal on road.
6. a kind of soft switch circuit of Switching Power Supply according to claim 5, it is characterised in that：Resistance R9 and R10 are work(
Rate resistance.
7. a kind of soft switch circuit of Switching Power Supply according to claim 2, it is characterised in that：The resistance R1 is power
Sampling resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710178902.8A CN107070441B (en) | 2017-03-23 | 2017-03-23 | Soft switching circuit of switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710178902.8A CN107070441B (en) | 2017-03-23 | 2017-03-23 | Soft switching circuit of switching power supply |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107070441A true CN107070441A (en) | 2017-08-18 |
| CN107070441B CN107070441B (en) | 2020-09-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710178902.8A Active CN107070441B (en) | 2017-03-23 | 2017-03-23 | Soft switching circuit of switching power supply |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108933520A (en) * | 2018-07-19 | 2018-12-04 | 启攀微电子（上海）有限公司 | A kind of super low-power consumption DCDC Switching Power Supply |
| CN112821726A (en) * | 2021-01-19 | 2021-05-18 | 张亚尔 | Switching power supply circuit and method |
| CN113252970A (en) * | 2021-04-23 | 2021-08-13 | 长城电源技术有限公司 | Load detection circuit and power supply system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203596603U (en) * | 2013-12-10 | 2014-05-14 | 北京易世恒电子技术有限责任公司 | Power supply control circuit |
| CN105871213A (en) * | 2015-01-21 | 2016-08-17 | 南京航空航天大学 | Control method and device in contactless electric energy transmission system |
-
2017
- 2017-03-23 CN CN201710178902.8A patent/CN107070441B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203596603U (en) * | 2013-12-10 | 2014-05-14 | 北京易世恒电子技术有限责任公司 | Power supply control circuit |
| CN105871213A (en) * | 2015-01-21 | 2016-08-17 | 南京航空航天大学 | Control method and device in contactless electric energy transmission system |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108933520A (en) * | 2018-07-19 | 2018-12-04 | 启攀微电子（上海）有限公司 | A kind of super low-power consumption DCDC Switching Power Supply |
| CN112821726A (en) * | 2021-01-19 | 2021-05-18 | 张亚尔 | Switching power supply circuit and method |
| CN113252970A (en) * | 2021-04-23 | 2021-08-13 | 长城电源技术有限公司 | Load detection circuit and power supply system |
| CN113252970B (en) * | 2021-04-23 | 2022-11-18 | 长城电源技术有限公司 | Load detection circuit and power supply system |
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| Publication number | Publication date |
|---|---|
| CN107070441B (en) | 2020-09-18 |
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