CN101764578B - Dual-path synchronous SS (soft start) control circuit - Google Patents
Dual-path synchronous SS (soft start) control circuit Download PDFInfo
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- CN101764578B CN101764578B CN2009101177328A CN200910117732A CN101764578B CN 101764578 B CN101764578 B CN 101764578B CN 2009101177328 A CN2009101177328 A CN 2009101177328A CN 200910117732 A CN200910117732 A CN 200910117732A CN 101764578 B CN101764578 B CN 101764578B
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Abstract
The invention discloses a dual-path synchronous SS (soft start) control circuit which is composed of a constant current source, a time delay capacitor, a voltage follower and a current amplifier. The constant current source charges the time delay capacitor, a first output voltage signal (Vout1) and an output current signal (Iout) of the voltage follower connected with the time delay capacitor synchronously and slowly drop in a linear manner; the current amplifier converts the output current signal (Iout) of the voltage follower into a second output voltage signal (Vout2) for synchronous, linear and slow drop; and corresponding signals are controlled by the synchronously/linearly/slowly-dropped first and second output voltage signals (Vout1, Vout2). The dual-path synchronous SS control circuit has the following characteristics: the starting current of the control circuit is reduced to 1/3 to 1/2 of that of a like product so that the starting characteristic of the control circuit is improved; the most obvious characteristic is that the requirement for output dynamic power of an input power supply is greatly lowered so as to exert the function of protecting a pre-stage circuit to certain degree.
Description
Technical field relates to a kind of start-up control circuit, belongs to a kind of dual-path synchronous SS (soft start) control circuit.
Background technology generally to not altogether the two paths of signals on ground carry out Synchronization Control, need to adopt the circuit of relative complex to realize.Such as in the class AB power amplification circuit, input power supply, signal section are powering up moment, all need soft start to a certain degree to delay time.If the input power supply obtains soft start, and signal section does not have soft start, can cause the distortion of output signal like this.If signal obtains soft start, and the input power supply does not have soft start, can cause power supply input starting current very big, and loss increases, and like this input power supply load capacity is had relatively high expectations.In circuit, under the situation of utilization distributed power source and long Distance Transmission, this requirement is just more obvious, and this is for also very unfavorable in the Circuits System that requirement is arranged aspect the volume.
Summary of the invention the objective of the invention is to avoid the deficiencies in the prior art and a kind of starting characteristic of improving circuit of providing, the requirement and the loss that have reduced input power supply output dynamic power reduce, to not altogether the two paths of signals on ground carry out dual-path synchronous SS (soft start) control circuit.
Technical solution of the present invention is: be made up of constant-current source, delay capacitor, voltage follower, current amplifier, constant-current source charges to delay capacitor, and the first output voltage signal Vout1, the output current signal Iout of the voltage follower that delay capacitor connects is linear synchronously slowly to descend; Current amplifier converts voltage follower output current signal Iout to the second output voltage signal Vout2 linear synchronously slowly decline, with linear slowly first, second output voltage signal Vout1, the Vout2 of decline control corresponding signal synchronously.
The invention has the beneficial effects as follows: described dual-path synchronous SS (soft start) control circuit; realization to not altogether the two paths of signals on ground carry out Synchronization Control; by improvement to circuit; make starting current reduce to 1/3～1/2 of like product starting current; improved the starting characteristic of circuit; wherein the most tangible is exactly the requirement that greatly reduces input power supply output dynamic power, can play a protective role to front stage circuits to a certain extent.Stability of the present invention is high, temperature float little, circuit structure is simple, with low cost, can be used on the field that some are had relatively high expectations to control precision.
Description of drawings Fig. 1 is the block diagram of dual-path synchronous SS (soft start) control circuit of the present invention
Fig. 2 is constant-current source, the delay capacitor among Fig. 1, the circuit theory diagrams of voltage follower
Fig. 3 is the circuit theory diagrams of the current amplifier among Fig. 1
Among the figure: 5 one earth signal Gnd1 of first output voltage signal Vout1 output current signal Iout the first operational amplifier IC1 first FET T1 the first resistance R 1 second resistance R 2 the 3rd resistance R 3 delay capacitor C1 the second operational amplifier T2 the first diode D1 the 4th resistance R 4 the 5th resistance R anti-phase input pin, 2 homophase input pins, 3 negative input pin, 4 positive input pin, 7 second operational amplifier IC2 the second diode D2 the 6th resistance R, 6 second positive supply Vcc2 negative supply Vee, second another earth signal of output voltage signal Vout2 Gnd2 the first positive supply Vcc1
Below in conjunction with accompanying drawing and most preferred embodiment technical scheme of the present invention is described in further detail.
Embodiment is with reference to Fig. 1, embodiment is made up of constant-current source, delay capacitor, voltage follower, current amplifier, constant-current source charges to delay capacitor, and the first output voltage signal Vout1, the output current signal Iout of the voltage follower that delay capacitor connects is linear synchronously slowly to descend; Current amplifier converts voltage follower output current signal Iout to the second output voltage signal Vout2 linear synchronously slowly decline, with linear slowly first, second output voltage signal Vout1, the Vout2 of decline control corresponding signal synchronously.With reference to Fig. 2, form constant-current source by the first operational amplifier IC1 and the first field effect transistor T1, first resistance R 1, second resistance R 2, the 3rd resistance R 3.Delay capacitor C1.Form voltage follower by the second field effect transistor T2, the first diode D1, the 4th resistance R 4, the 5th resistance R 5.Wherein, the positive input pin 7 of the first operational amplifier IC1 meets the first positive supply Vcc1, the negative input pin 4 of the first operational amplifier IC1 meets an earth signal Gnd1, the homophase input pin 3 of the first operational amplifier IC1 links to each other with the first positive supply Vcc1 by first resistance R 1, homophase input pin 3 pin of the first operational amplifier IC1 link to each other with an earth signal Gnd1 by second resistance R 2, the anti-phase input pin 2 of the first operational amplifier IC1 links to each other with the source electrode of the first field effect transistor T1, the anti-phase input pin 2 of the first operational amplifier IC1 links to each other with an earth signal Gnd1 by the 3rd resistance R 3, the output pin 6 of the first operational amplifier IC1 links to each other with the grid of the first field effect transistor T1, the drain electrode of the first field effect transistor T1 links to each other with the first positive supply Vcc1 by capacitor C 1, the drain electrode of the first field effect transistor T1 links to each other with the grid of the second field effect transistor T2, the drain electrode of the first field effect transistor T1 links to each other with the negative pole of the first diode D1, the positive pole of the first diode D1 links to each other with an earth signal Gnd1, the drain electrode of the second field effect transistor T2 links to each other with output current signal Iout, the source electrode of the second field effect transistor T2 links to each other with an earth signal Gnd1 by the 4th resistance R 4, and the source electrode of the second field effect transistor T2 links to each other with the first output voltage signal Vout1 by the 5th resistance R 5.Among Fig. 3, current amplifier is that the positive input pin 7 of the second operational amplifier IC2 meets the second positive supply Vcc2, the negative input pin 4 of the second operational amplifier IC2 meets negative supply Vee, the homophase input pin 3 of the second operational amplifier IC2 links to each other with the second output voltage V out2 by the 6th resistance R 6, the homophase input pin 3 of the second operational amplifier IC2 links to each other with output current signal Iout, the homophase input pin 3 of the second operational amplifier IC2 links to each other with the negative pole of the second diode D2, the anti-phase input pin 2 of the second operational amplifier IC2 links to each other with another earth signal Gnd2, the output pin 6 of the second operational amplifier IC2 links to each other the plus earth of the second diode D2 with the second output voltage signal Vout2.
Operation principle of the present invention: in Fig. 2,, charge for delay capacitor C1 by the constant-current source that the first operational amplifier IC1 and the first field effect transistor T1, first resistance R 1, second resistance R 2, the 3rd resistance R 3 are formed.The second field effect transistor T2 grid voltage slowly descends, and the source voltage of the corresponding with it second field effect transistor T2 is linear synchronously slowly to descend, and the while second field effect transistor T2 leaks also linear synchronously slow decline of level output current signal Iout.In Fig. 3, the current amplifier of forming by the second operational amplifier IC2 and the 6th resistance R 6, the second diode D2, convert output current signal Iout to second output voltage signal Vout2 signal, the second output voltage signal Vout2 signal slowly descends along with output current signal Iout is linear synchronously.Gnd1, Gnd2 are two different earth signals, current potential differs about 20V, first, second output voltage signal Vout1, the Vout2 that slowly descend with synchronous linearity control corresponding signal, reach to not altogether the two paths of signals on ground carry out dual-path synchronous SS (soft start) control.
Selection of components of the present invention and parameter are as follows: the model of the first field effect transistor T1 and the second field effect transistor T2 is IRF7130 among Fig. 2, Fig. 3, the model of the first operational amplifier IC1 and the second operational amplifier IC2 is LM741, and the model of the first diode D1 and the second diode D2 is IN4148; Vcc1=18V Vcc2=15V Vee=-15V R1=16k Ω R2=1k Ω R3=100k Ω R4=2k Ω R5=10k Ω R6=2k Ω C1=100 μ F/25V.
Claims (1)
1. dual-path synchronous SS (soft start) control circuit, it is characterized in that: form by constant-current source, delay capacitor, voltage follower, current amplifier, constant-current source charges to delay capacitor, and first output voltage signal (Vout1) of the voltage follower that delay capacitor connects, output current signal (Iout) are linear synchronously slowly to descend; Current amplifier converts voltage follower output current signal (Iout) to second output voltage signal (Vout2) linear synchronously slowly decline, uses linear synchronously slowly first, second output voltage signal (Vout1, Vout2) of decline to control corresponding signal;
Described constant-current source is that the positive input pin (7) of first operational amplifier (IC1) connects first positive supply (Vcc1), the negative input pin (4) of first operational amplifier (IC1) connects an earth signal (Gnd1), the homophase input pin (3) of first operational amplifier (IC1) links to each other with first positive supply (Vcc1) by first resistance (R1), homophase input pin (3) pin of first operational amplifier (IC1) links to each other with an earth signal (Gnd1) by second resistance (R2), the anti-phase input pin (2) of first operational amplifier (IC1) links to each other with the source electrode of first field effect transistor (T1), the anti-phase input pin (2) of first operational amplifier (IC1) links to each other with an earth signal (Gnd1) by the 3rd resistance (R3), the output pin (6) of first operational amplifier (IC1) links to each other with the grid of first field effect transistor (T1), the drain electrode of first field effect transistor (T1) links to each other with first positive supply (Vcc1) by delay capacitor (C1), and the drain electrode of first field effect transistor (T1) links to each other with the grid of second field effect transistor (T2);
Described voltage follower is that the negative pole of first diode (D1) links to each other with the drain electrode of first field effect transistor (T1), the positive pole of first diode (D1) links to each other with an earth signal (Gnd1), the drain electrode of second field effect transistor (T2) links to each other with output current signal (Iout), the source electrode of second field effect transistor (T2) links to each other with an earth signal (Gnd1) by the 4th resistance (R4), and the source electrode of second field effect transistor (T2) links to each other with first output voltage signal (Vout1) by the 5th resistance (R5);
Described current amplifier is that the positive input pin (7) of second operational amplifier (IC2) connects second positive supply (Vcc2); The negative input pin (4) of second operational amplifier (IC2) connects negative supply (Vee), the homophase input pin (3) of second operational amplifier (IC2) links to each other with second output voltage signal (Vout2) by the 6th resistance (R6), the homophase input pin (3) of second operational amplifier (IC2) links to each other with output current signal (Iout), the homophase input pin (3) of second operational amplifier (IC2) links to each other with the negative pole of second diode (D2), the anti-phase input pin (2) of second operational amplifier (IC2) links to each other with another earth signal (Gnd2), the output pin (6) of second operational amplifier (IC2) links to each other with second output voltage signal (Vout2), the plus earth of second diode (D2).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101177328A CN101764578B (en) | 2009-12-15 | 2009-12-15 | Dual-path synchronous SS (soft start) control circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009101177328A CN101764578B (en) | 2009-12-15 | 2009-12-15 | Dual-path synchronous SS (soft start) control circuit |
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| CN101764578A CN101764578A (en) | 2010-06-30 |
| CN101764578B true CN101764578B (en) | 2011-11-16 |
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| CN2009101177328A Expired - Fee Related CN101764578B (en) | 2009-12-15 | 2009-12-15 | Dual-path synchronous SS (soft start) control circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105305800B (en) * | 2015-11-18 | 2018-08-28 | 明纬(广州)电子有限公司 | A kind of surge current suppression circuit |
| CN107565809B (en) * | 2017-09-04 | 2019-11-29 | 北京遥测技术研究所 | A kind of control polymorphic type line lock starter |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0532263A1 (en) * | 1991-09-13 | 1993-03-17 | Motorola, Inc. | DC/DC voltage converting device |
| US6067241A (en) * | 1996-12-11 | 2000-05-23 | International Power Devices, Inc. | Dual-output DC-DC power supply |
| JP2007028732A (en) * | 2005-07-13 | 2007-02-01 | Rohm Co Ltd | Switching circuit and switching power unit |
| CN201007805Y (en) * | 2007-01-08 | 2008-01-16 | 深圳市国冶星光电子有限公司 | Digital type adjustable constant-current constant voltage source |
| CN201185392Y (en) * | 2008-04-23 | 2009-01-21 | 上海奉天电子有限公司 | Accurate follow insulation power supply with protection function |
-
2009
- 2009-12-15 CN CN2009101177328A patent/CN101764578B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0532263A1 (en) * | 1991-09-13 | 1993-03-17 | Motorola, Inc. | DC/DC voltage converting device |
| US6067241A (en) * | 1996-12-11 | 2000-05-23 | International Power Devices, Inc. | Dual-output DC-DC power supply |
| JP2007028732A (en) * | 2005-07-13 | 2007-02-01 | Rohm Co Ltd | Switching circuit and switching power unit |
| CN201007805Y (en) * | 2007-01-08 | 2008-01-16 | 深圳市国冶星光电子有限公司 | Digital type adjustable constant-current constant voltage source |
| CN201185392Y (en) * | 2008-04-23 | 2009-01-21 | 上海奉天电子有限公司 | Accurate follow insulation power supply with protection function |
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| CN101764578A (en) | 2010-06-30 |
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Effective date of registration: 20160823 Address after: 741000 No. 14 Shuangqiao Road, Gansu, Tianshui Patentee after: Tianshui Alex Hua Tian electronic group Limited by Share Ltd Address before: 741000 No. 14 Shuangqiao Road, Gansu, Tianshui Patentee before: Tianshui Huatian Microelectronic Co., Ltd. |
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