CN105262326B - A kind of switch power source output voltage linearly starts control circuit - Google Patents
A kind of switch power source output voltage linearly starts control circuit Download PDFInfo
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- CN105262326B CN105262326B CN201510784767.2A CN201510784767A CN105262326B CN 105262326 B CN105262326 B CN 105262326B CN 201510784767 A CN201510784767 A CN 201510784767A CN 105262326 B CN105262326 B CN 105262326B
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Abstract
The present invention relates to a kind of switch power source output voltage linearly to start control circuit, including error amplifying unit, output sampling unit, reference voltage unit, current control unit, discharge circuit unit and the first electric capacity C1, one end of the electric capacity C1 is connected with the input of error amplifying unit, its other end ground connection；The input of the output sampling unit is connected with electric power output voltage, its output end is connected with the input of error amplifying unit, the output end of the reference voltage unit is connected with the input of error amplifying unit, the output end of the current control unit is connected with the input of error amplifying unit, and the input of the discharge circuit unit is connected with the output end of reference voltage unit.The present invention can realize to be controlled when Switching Power Supply is started shooting to output voltage waveforms, is made it have linear rise characteristic, is improved circuit safety and adaptability, and guarantee is provided safely for load system.
Description
Technical field
The present invention relates to switch power technology field, and in particular to a kind of switch power source output voltage linearly starts control electricity
Road.
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.In Switching Power Supply starting up
When i.e. electric on input power, the output voltage waveforms of Switching Power Supply have a significant impact to load machine system.Output voltage rises
Time, slope difference can cause different impacts to load, as produced larger surge current during large capacitive load.If output
Voltage has larger startup overshoot, load overvoltage can be caused to damage when serious.In some application scenarios, power supply repeatedly can frequently be held
Machine, shutdown, if voltage is not discharged circuit within the unused time on the first electric capacity in this state, when starting shooting again
Output voltage will be unable to by linear rise, and to cause load failure there may be overshoot or damage.
The content of the invention
It is an object of the invention to provide a kind of switch power source output voltage linearly to start control circuit, can realize and open
Output voltage waveforms are controlled during powered-down source start, make it have linear rise characteristic, circuit safety is improved and fits
Ying Xing, guarantee is provided safely for load system.
To achieve the above object, present invention employs following technical scheme：It is single including error amplifying unit, output sampling
Member, reference voltage unit, current control unit, discharge circuit unit and the first electric capacity C1, one end of the electric capacity C1 and error
The inverting input of amplifying unit is connected, its other end ground connection；
The input of the output sampling unit is connected with electric power output voltage, and its output end is same with error amplifying unit
Phase input is connected, for error amplifying unit to be sampled and be sent to output voltage；
The output end of the reference voltage unit is connected with the inverting input of error amplifying unit, for producing a height
The reference voltage of precision, and the reference voltage using the reference voltage as error amplifying unit；
The output end of the current control unit is connected with the inverting input of error amplifying unit, can for producing one
The continuous current power supply of control charges to electric capacity C1, the voltage linear on electric capacity C1 is increased；
The discharge circuit unit, for the voltage on electric capacity C1 to be released rapidly when power supply shuts down, to open next time
Voltage is started from scratch and prepared on electric capacity C1 during machine.
Further improvement as above-mentioned technical proposal：
The error amplifying unit includes error amplifier N1, decoupling capacitor C2, compensating electric capacity C4, C5, and compensation electricity
R7 is hindered, the output end of the error amplifier N1 is connected with the input of output feedback ontrol circuit, and its in-phase input end is successively
It is connected by resistance R7 and compensating electric capacity C5 with error amplifier N1 output end, the compensating electric capacity C4 is connected in parallel on compensation resistance
R7 and compensating electric capacity C5 both ends, error amplifier N1 inverting input are grounded through electric capacity C1, and the one of the decoupling capacitor C2
End is connected with error amplifier N1 in-phase input end, and its other end is connected with error amplifier N1 inverting input.
The output sampling unit includes resistance R1, R2, R3 and electric capacity C3, the resistance R1 one end and power supply output electricity
Pressure is connected, and its other end is grounded by resistance R2, and one end of the electric capacity C3 is connected to the node between resistance R1 and resistance R2
Place, its other end are connected through resistance R3 with electric power output voltage, the node between the resistance R1 and R2 and error amplifying unit
In-phase input end be connected.
The reference voltage unit includes standard of precision voltage source D3 and soft opens electric capacity C6, the standard of precision voltage source D3
Plus earth, its negative electrode is connected through resistance R4 with the inverting input of error amplifying unit, described soft one end for opening electric capacity C6
It is connected with the input of current control unit, its other end ground connection.
The current control unit includes triode Q1, biasing resistor R6 and current-limiting resistance R5, the discharge circuit unit
Including diode D1 and D2, the base stage of the triode Q1 is connected through biasing resistor R6 with power supply VCC, and its colelctor electrode is through resistance R5
It is connected with power supply VCC, its emitter stage is connected with the inverting input of error amplifying unit, the anode of the diode D1 and three poles
Pipe Q1 base stage is connected, and its negative electrode is connected with power supply VCC, the anode of the diode D2 and the anti-phase input of error amplifying unit
End is connected, and its negative electrode is connected with power supply VCC.
As shown from the above technical solution, the switch power source output voltage of (1) present invention linearly starts control circuit and passes through control
Triode base current processed is so that the reference voltage of error amplifier linearly rises, so that control circuit output voltage in start
Phenomena such as linear rising is not in depression, restarting and overshoot during rising on the output voltage.Whole control
Circuit principle structure processed is simple, only has more a transistor, two resistance and two electric capacity, occupies little space, debugging side
Just.(2) rate of rise of the reference voltage of error amplifier and time are determined by charging capacitor capacity and charging current
, and the two parameters are all easy to calculate and set, by setting suitable parameter to obtain with load system more
Add the output voltage waveforms of matching, improve the system suitability of product.
Brief description of the drawings
Fig. 1 is the circuit block diagram of the present invention；
Fig. 2 is the circuit theory diagrams of the present invention.
Embodiment
The present invention will be further described below in conjunction with the accompanying drawings：
As shown in figure 1, the switch power source output voltage of the present embodiment linearly starts control circuit, including error amplifying unit
1st, sampling unit 2, reference voltage unit 3, current control unit 4, discharge circuit unit 5 and first electric capacity C1, electric capacity C1 are exported
One end be connected with the inverting input of error amplifying unit 1, its other end ground connection；Export the input and electricity of sampling unit 2
Source output voltage is connected, and its output end is connected with the in-phase input end of error amplifying unit 1, for being sampled to output voltage
And it is sent to error amplifying unit 1；The output end of reference voltage unit 3 is connected with the inverting input of error amplifying unit 1,
For producing a high-precision reference voltage, and the reference voltage using the reference voltage as error amplifying unit 1；Electric current control
The output end of unit 4 processed is connected with the inverting input of error amplifying unit 1, for producing a controllable continuous current electricity
Source is charged to electric capacity C1, the voltage linear on electric capacity C1 is increased；Discharge circuit unit 5, for fast when power supply shuts down
Speed releases the voltage on electric capacity C1, and voltage is started from scratch and prepared on electric capacity C1 during to start shooting next time.
As shown in Fig. 2 output feedback ontrol circuit includes photoelectrical coupler N2, error amplifying unit 1 is put including error
Big device N1, decoupling capacitor C2, compensating electric capacity C4, C5, and compensation resistance R7, error amplifier N1 output end pass through resistance R8
It is connected with photoelectrical coupler N2 input, its in-phase input end passes sequentially through resistance R7 and compensating electric capacity C5 and error amplifier
N1 output end is connected, and compensating electric capacity C4 is connected in parallel on compensation resistance R7 and compensating electric capacity C5 both ends, and error amplifier N1's is anti-
Phase input is grounded through electric capacity C1, and decoupling capacitor C2 one end is connected with error amplifier N1 in-phase input end, its other end
It is connected with error amplifier N1 inverting input.
Output sampling unit 2 includes resistance R1, R2, R3 and electric capacity C3, and resistance R1 one end is connected with electric power output voltage,
Its other end is grounded by resistance R2, and electric capacity C3 one end is connected at the node between resistance R1 and resistance R2, its other end
It is connected through resistance R3 with electric power output voltage, the in-phase input end phase of the node between resistance R1 and R2 and error amplifier N1
Even.
Reference voltage unit 3 includes standard of precision voltage source D3 and soft opens electric capacity C6, standard of precision voltage source D3 anode
Ground connection, its negative electrode are connected through resistance R4 with error amplifier N1 inverting input, the soft one end for opening electric capacity C6 and electric current control
The input of unit 4 processed is connected, its other end ground connection.
Current control unit 4 includes triode Q1, biasing resistor R6 and current-limiting resistance R5, and discharge circuit unit 5 includes two
Pole pipe D1 and D2, triode Q1 base stage are connected through biasing resistor R6 with power supply VCC, and its colelctor electrode is through resistance R5 and power supply VCC
It is connected, its emitter stage is connected through resistance R4 with error amplifier N1 inverting input, diode D1 anode and triode Q1
Base stage be connected, its negative electrode is connected with power supply VCC, and diode D2 anode is connected with the inverting input of error amplifying unit 1,
Its negative electrode is connected with power supply VCC.
Operation principle：When Switching Power Supply has just started start power-up, VCC voltages are charged by R6 to C6, and the upper voltages of C6 delay
Slow to rise, when the voltage on C6 is less than when opening be junction voltages of triode Q1, standard of precision voltage source D3 voltage is zero, by mistake
Poor amplifier N1 output is low level, and the electric current at this moment flowing through light emitting diode in photoelectrical coupler N2 is maximum, and its is anti-
It is fed to primary PWM controller and closes PWM pulsewidth output signals, it is zero to make output of products voltage, in circuit output start delay
Stage.When voltage rises to when opening be junction voltages of triode Q1 on C6, triode Q1 is open-minded, at this moment resistance R6 both end voltages
It is invariable, so the electric current for flowing into triode Q1 base stages is constant current, flow through triode Q1 Ic electric currents also substantially constant
It is constant.Now constant Ic electric currents are charged by resistance R4 to electric capacity C1 electric capacity, and the voltage linear at electric capacity C1 both ends rises, error
Amplifier N1 output voltage also with linear rise, cause to flow through the electric current of light emitting diode in photoelectrical coupler N2 also with
Linear reduction, thus control circuit output voltage linear rising.When down circuitry, electric capacity C1 and the soft voltage opened on electric capacity C6
By diode D2, D1 repid discharge, preferably prepare for circuit power-up next time start.
Switch power source output voltage of the present invention linearly starts control circuit, suitable for various isolation type switch powers or
DC/DC converters, can start when effective controlling switch electric power output voltage startup output waveform, make its rise time,
Slope is controllable, and output overshoot is small.In the presence of output voltage linearly starts control circuit, can make output voltage it is linear slowly on
Rise, greatly reducing output overshoot even can accomplish no overshoot, and the impact greatly reduced on load is influenceed, avoids output voltage from surpassing
Overload safe voltage requires and damages load system.Its discharge circuit can be in gsec by the voltage on the first electric capacity
It has been released that, far smaller than the start-up study time of power supply start, can guarantee that power supply is repeatedly frequently started shooting, shut down output voltage all lines
Property rise, improve circuit safety and adaptability, provide guarantee safely for load system.
Embodiment described above is only that the preferred embodiment of the present invention is described, not to the model of the present invention
Enclose and be defined, on the premise of design spirit of the present invention is not departed from, technical side of the those of ordinary skill in the art to the present invention
The various modifications and improvement that case is made, it all should fall into the protection domain of claims of the present invention determination.
Claims (4)
1. a kind of switch power source output voltage linearly starts control circuit, it is characterised in that：Including error amplifying unit（1）, it is defeated
Go out sampling unit（2）, reference voltage unit（3）, current control unit（4）, discharge circuit unit（5）With the first electric capacity C1, institute
State electric capacity C1 one end and error amplifying unit（1）Inverting input be connected, its other end ground connection；
The output sampling unit（2）Input be connected with electric power output voltage, its output end and error amplifying unit（1）'s
In-phase input end is connected, for error amplifying unit to be sampled and be sent to output voltage（1）；
The reference voltage unit（3）Output end and error amplifying unit（1）Inverting input be connected, for produce one
High-precision reference voltage, and using the reference voltage as error amplifying unit（1）Reference voltage；
The current control unit（4）Output end and error amplifying unit（1）Inverting input be connected, for produce one
Controllable continuous current power supply charges to electric capacity C1, the voltage linear on electric capacity C1 is increased；
The discharge circuit unit（5）, for the voltage on electric capacity C1 to be released rapidly when power supply shuts down, to start shooting next time
When electric capacity C1 on voltage start from scratch and prepare；
The current control unit（4）Including triode Q1, biasing resistor R6 and current-limiting resistance R5, the discharge circuit unit
（5）Including diode D1 and D2, the base stage of the triode Q1 is connected through biasing resistor R6 with power supply VCC, and its colelctor electrode is through limit
Leakage resistance R5 is connected with power supply VCC, its emitter stage and error amplifying unit（1）Inverting input be connected, the diode D1
Anode be connected with triode Q1 base stage, its negative electrode is connected with power supply VCC, and the anode of the diode D2 and error amplification are single
Member（1）Inverting input be connected, its negative electrode is connected with power supply VCC.
2. switch power source output voltage according to claim 1 linearly starts control circuit, it is characterised in that：The error
Amplifying unit（1）Including error amplifier N1, decoupling capacitor C2, compensating electric capacity C4, C5, and compensation resistance R7, the error
Amplifier N1 output end is connected with the input of output feedback ontrol circuit, and its in-phase input end passes sequentially through resistance R7 and benefit
The output end that electric capacity C5 is repaid with error amplifier N1 is connected, and the compensating electric capacity C4 is connected in parallel on compensation resistance R7 and compensating electric capacity C5
Both ends, error amplifier N1 inverting input is grounded through electric capacity C1, one end of the decoupling capacitor C2 and error amplifier
N1 in-phase input end is connected, and its other end is connected with error amplifier N1 inverting input.
3. switch power source output voltage according to claim 1 linearly starts control circuit, it is characterised in that：The output
Sampling unit（2）Including resistance R1, R2, R3 and electric capacity C3, one end of the resistance R1 is connected with electric power output voltage, and its is another
End is grounded by resistance R2, and one end of the electric capacity C3 is connected at the node between resistance R1 and resistance R2, its other end warp
Resistance R3 is connected with electric power output voltage, the node between the resistance R1 and R2 and error amplifying unit（1）Homophase input
End is connected.
4. switch power source output voltage according to claim 1 linearly starts control circuit, it is characterised in that：The benchmark
Voltage cell（3）Including standard of precision voltage source D3 and it is soft open electric capacity C6, the plus earth of the standard of precision voltage source D3, its
Negative electrode is through resistance R4 and error amplifying unit（1）Inverting input be connected, described soft one end for opening electric capacity C6 and triode Q1
Base stage connection, its other end ground connection.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510784767.2A CN105262326B (en) | 2015-11-16 | 2015-11-16 | A kind of switch power source output voltage linearly starts control circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510784767.2A CN105262326B (en) | 2015-11-16 | 2015-11-16 | A kind of switch power source output voltage linearly starts control circuit |
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| Publication Number | Publication Date |
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| CN105262326A CN105262326A (en) | 2016-01-20 |
| CN105262326B true CN105262326B (en) | 2018-03-09 |
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| CN201510784767.2A Active CN105262326B (en) | 2015-11-16 | 2015-11-16 | A kind of switch power source output voltage linearly starts control circuit |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107462762B (en) * | 2017-09-06 | 2023-07-18 | 中国电子科技集团公司第四十三研究所 | Combined power supply output end current conversion voltage telemetry circuit and implementation method thereof |
| CN107947557B (en) * | 2017-12-05 | 2023-07-04 | 合肥华耀电子工业有限公司 | Soft start circuit for resisting overvoltage and undervoltage surges |
| CN108832667B (en) * | 2018-05-03 | 2020-09-25 | 许继电源有限公司 | Soft start control circuit applied to control of DC output of switching power supply |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US8907643B2 (en) * | 2011-11-15 | 2014-12-09 | International Rectifier Corporation | Power supply circuitry and adaptive transient control |
| CN202907263U (en) * | 2012-09-20 | 2013-04-24 | 肖应梅 | Slow-starting constant-current control circuit for LED driving power supply |
| CN202906730U (en) * | 2012-09-20 | 2013-04-24 | 肖应梅 | Self-switching-on-off starting control circuit used for LED flyback driving power supply |
| CN205160347U (en) * | 2015-11-16 | 2016-04-13 | 中国电子科技集团公司第四十三研究所 | Linear start control circuit of switching power supply output voltage |
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