CN1450431A - Compensation circuit and method for diode voltage drop of power supply output terminal - Google Patents
Compensation circuit and method for diode voltage drop of power supply output terminal Download PDFInfo
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- CN1450431A CN1450431A CN 03113587 CN03113587A CN1450431A CN 1450431 A CN1450431 A CN 1450431A CN 03113587 CN03113587 CN 03113587 CN 03113587 A CN03113587 A CN 03113587A CN 1450431 A CN1450431 A CN 1450431A
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Abstract
The invention suggests a compensating circuit and method for the drop in the diode on the output end of a power supply. Its characters, directly collecting the drop in the isolating diode, using the compensating end to superpose the drop in the diode upon output voltage, to make the adjusted output voltage into the needed voltage value, meanwhile, using 1:1 amplifier to isolate the sampling point and the compensating end. Because there is no backward-flowing return between Dc bus line and the power supply, therefore they can't interfere with each other when several power supply modules are paralle. Because the external isolated diode isn't brought into the compensating loop in the power supply, no changes for the parameters of the compensating loop is ncessary, assuring stable operation of the power supply to avoid external interference.
Description
Technical field
The present invention relates to a kind of compensating circuit and compensation method of power output end diode drop, the pressure drop (V ') that is used for the output terminal isolating diode (D) of power supply with closed loop compensation function compensates.
Background technology
In order to improve the reliability of electric power system, often need backup in parallel of a plurality of power supplies and isolation could be guaranteed can withdraw from this electric power system automatically behind certain power fail in the electric power system like this, do not influence the operate as normal of system.Isolating diode of output terminal series connection at power supply is considered to the most simple and reliable isolation method.But because there is pressure drop in diode itself, the voltage that causes load end zero load during to fully loaded the variation difference bigger, i.e. load regulation big (occasion particularly low for output voltage, that output power is big) can't satisfy the power requirement of load end; Therefore must carry out voltage compensation, the precision of ability proof load terminal voltage.As nonlinear device, how diode drop accurately compensates the pressure drop of this isolating diode along with load, variation of temperature and change, and becomes technological difficulties.
Adopt the mode of diode-isolated power supply, be of long duration.Power supply on from the large-scale electric power system of tens of kw of power to general plate all can make in this way, particularly in modular power source backup output in parallel.To the compensation of diode drop, roughly can be divided into two kinds:
1) open-loop compensation: according to the data of diode, determine the change in pressure drop scope under the concrete applicable cases, compensate according to intermediate value then.Export adjustable power supply and all be provided with the adjusting pin, general identifications is TRIM.By outer meeting resistance the TRIM end is linked to each other with output, raise the voltage at modular power source output pin place, just can reach the adjusting purpose.Synoptic diagram as shown in Figure 1.This kind mode is fairly simple, but compensation effect is relatively poor.
2) closed loop compensation: the voltage to load end is sampled, and diode is included in the compensation loop of power supply inside.This kind mode can compensate comparatively accurately according to the actual pressure drop of diode.Have the power supply of this function all to be provided with special-purpose compensation pins, general identifications is Sense (comprising Sense+, Sense-), receives the close-loop feedback signal.Synoptic diagram as shown in Figure 2.
The pressure drop of diode to be accurately compensated, the mode of closed loop adjustment must be adopted.At present, mode commonly used is directly sampled point to be linked to each other with the Sense end, perhaps is connected in series a small resistor as buffering.Circuit diagram as shown in Figure 3.
The shortcoming of this kind closed-loop control is:
1) voltage of load end is sampled, include external isolating diode the feedback control loop of power supply itself in, increased the instability of power supply feedback control loop, cause power supply output concussion easily.Can reduce the antijamming capability (EMS index) of power supply.
2) value of series resistor R need be determined according to modular power source internal compensation parameter, and relevant factor is more, and different power supplys need be got different resistance values.Directly substituting of different brands power supply is restricted.
3) application of power is in the middle of system's power supply, and output need link to each other with dc bus.When the backup in parallel of several power modules was exported, owing to open the difference of machine time and output voltage precision, the electric power output voltage that opens machine earlier can directly pour into the compensation end of other power supplys by dc bus, feedback resistance R, and synoptic diagram as shown in Figure 4.At this moment, the degree of regulation of other power supplys can be affected, and may cause the machine that can't normally open when serious.If power supply has adopted synchronous rectification, also may damage power supply.
Summary of the invention
Purpose of the present invention just provides a kind of compensating circuit and compensation method of power output end diode drop, the pressure drop (V ') that is used for the output terminal isolating diode (D) of power supply with closed loop compensation function compensates, dc bus interference and voltage pour in down a chimney problem in the solution prior art, improve the stability of power work.
Described compensating circuit comprises sampling apparatus, spacer assembly and regulating device, is respectively applied for the isolated DC bus and pours in down a chimney the loop and regulate compensation rate; The sampled point of described sampling apparatus is located at the two ends of isolating diode (D), the output termination spacer assembly of sampling apparatus, the output termination regulating device of spacer assembly, the compensation end of the output termination power of regulating device (Sense+, Sense-or Trim).
Described compensation method comprises the steps: directly to gather the pressure drop (V ') at isolating diode (D) two ends; With the pressure drop at isolating diode (D) two ends that collect (V ') through spacer assembly isolate out on the straight edge line pour in down a chimney the loop, regulating device feeds back to output voltage (Vo+) after regulating its amplitude and polarity, obtains adjusted output voltage (Vo+V '); Adjusted output voltage (Vo+V ') through becoming needed magnitude of voltage (Vo) after isolating diode (D) step-down.
According to one embodiment of present invention, described spacer assembly and regulating device are made up of 1: 1 amplifier, and the sampling apparatus output terminal connects two input ends of amplifier respectively; The negative compensation end of the output termination of amplifier (Sense-), power supply output plus terminal (Vo+) is connected to and just compensates end (Sense+), the power supply negative terminal directly or by negative supply (Vee) connect power supply output negative terminal (Vo-), with the output negative terminal of power supply as reference.
According to one embodiment of present invention, described 1: 1 amplifier is 1: 1 differential amplifier, and perhaps by 1: N amplifier and N: 1 reducing transformer or voltage divider combine, and wherein N is the natural number greater than 1.
Adopt such scheme to have following advantage: 1) because the loop is not poured in down a chimney in the isolation of amplifier between dc bus and the power supply.In the time of the output in parallel of several power modules, the phase mutual interference can not appear, cause the situation of the machine that can't open.2) the isolating diode of outside is not included in the compensation loop of power supply inside, guaranteed that power supply can steady operation, avoid external disturbance.3) the pressure drop of Direct Sampling isolating diode (V '), it is a definite value, offset and compensation precision are not subjected to the influence of power supply inner parameter, and be only relevant with the precision of differential amplifier; Better compatible.
Description of drawings
Fig. 1 is an open-loop compensation circuit diagram in the prior art.
Fig. 2 is a closed loop compensation circuit diagram in the prior art.
Fig. 3 is the compensating circuit synoptic diagram of available technology adopting small resistor buffering.
Fig. 4 is that prior art shown in Figure 3 causes the principle schematic of pouring in down a chimney.
Fig. 5 is a block diagram of the present invention.
Fig. 6 is the embodiment of the invention one synoptic diagram.
Fig. 7 is the embodiment of the invention two synoptic diagram.
Fig. 8 is the embodiment of the invention three synoptic diagram.
Fig. 9 is the embodiment of the invention four synoptic diagram.
Embodiment
Power supply with compensation end, the sampled point of inner loop of voltage regulation are just to compensate end Sense+ and negative compensation end Sense-.Under any circumstance, the voltage between Sense+ and the Sense-all is nominal output voltage (Vo), and this is the inherent characteristic of power supply.
Design philosophy of the present invention is: the pressure drop of directly gathering the isolating diode two ends, utilize 1: 1 differential amplifier, this Voltage Feedback is arrived Sense-, simultaneously with Sense+ and output cathode short circuit, thereby the pressure drop of diode is superimposed upon on the output voltage, accurately compensates diode drop; Isolate the compensation end of sampled point and power supply with differential amplifier, do not pour in down a chimney the loop, avoided the interference of dc bus.This way can solve three big shortcomings of prior art, improves the stability of power work.
Embodiment one: its theory diagram is (isolation and the compensating circuit of the single power supply that only drawn, other backup batteries in parallel are in like manner) as shown in Figure 5, and principle of work is:
The enlargement factor of differential amplifier is 1, and its output voltage is exactly the sampled voltage v ' on the diode.With the output cathode of power supply power supply Vcc as amplifier, with the output negative pole of power supply as with reference to ground (need insert during dual power supply-the Vee negative supply).As between Fig. 5: Sense+ and the Sense-being rated output voltage Vo (power supply characteristic decision), the voltage between Sense-and the Vo-is diode drop v ' (enlargement factor by differential amplifier is 1 decision).Voltage between Vo+ and the Vo-is Vo+v ' so, behind diode D step-down v ', has just obtained accurate rated voltage Vo at load end.
Wherein differential amplifier also can adopt the other types amplifier.
Embodiment two: as shown in Figure 6, situation when it is suitable for isolating diode D and is serially connected in power supply negative terminal, the difference of it and embodiment one need to be a negative supply-Vee, the power supply negative terminal (Vee) connects power supply output negative terminal (Vo-) by negative supply, negative supply-Vee can be 0, can not be OV also.
Embodiment three: as shown in Figure 7, it is similar to the situation of embodiment two, the situation when also being suitable for isolating diode D and being serially connected in power supply negative terminal, thereby it also needs a negative supply-Vee.Different is that sampled point is reverse, and amplifier is exported again oppositely once.
Embodiment four: as shown in Figure 8, it is similar to the situation of embodiment one, and different is that sampled point is reverse, and amplifier is exported again oppositely once.
From embodiment three, four we as can be seen, do not breaking away under the prerequisite that the present invention conceives substantially, the scheme of multiple variation can be proposed, these all should belong to protection scope of the present invention.For example: though the present invention needs differential amplifiers of 1: 1, with 1: the differential amplifier of N is again in conjunction with a N: 1 step-down or voltage divider equally also can achieve the goal (wherein N is the natural number greater than 1); And for example, the working power of amplifier can be from being introduced by the output of the power supply that compensated, but it also can introduce by any power supply that satisfies condition from system, or the like.
Claims (10)
1, a kind of compensating circuit of power output end diode drop is characterized in that: comprise sampling apparatus, spacer assembly and regulating device are respectively applied for the isolated DC bus and pour in down a chimney the loop and regulate compensation rate; The sampled point of described sampling apparatus is located at the two ends of isolating diode (D), the output termination spacer assembly of sampling apparatus, the output termination regulating device of spacer assembly, the compensation end of the output termination power of regulating device (Sense+, Sense-or Trim).
2, the compensating circuit of power output end diode drop as claimed in claim 1 is characterized in that: described spacer assembly and regulating device are made up of 1: 1 amplifier, and the sampling apparatus output terminal connects two input ends of amplifier respectively; The negative compensation end of the output termination of amplifier (Sense-), power supply output plus terminal (Vo+) is connected to and just compensates end (Sense+), the power supply negative terminal directly or by negative supply (Vee) connect power supply output negative terminal (Vo-), with the output negative terminal of power supply as reference.
3, the compensating circuit of power output end diode drop as claimed in claim 1 is characterized in that: described 1: 1 amplifier is 1: 1 differential amplifier, and perhaps by 1: N amplifier and N: 1 reducing transformer or voltage divider combine, and wherein N is the natural number greater than 1.
4, the compensating circuit of power output end diode drop as claimed in claim 1 is characterized in that: amplifier power supply anode (Vcc) connects power supply output plus terminal (Vo+).
5, the compensating circuit of power output end diode drop as claimed in claim 1 is characterized in that: described isolating diode (D) is serially connected in power supply output plus terminal (Vo+), and the power supply negative terminal of 1: 1 amplifier directly connects power supply output negative terminal (Vo-); The sampled point that is positioned at isolating diode (D) anode connects the normal phase input end of 1: 1 amplifier, and the sampled point that is positioned at isolating diode (D) negative electrode connects 1: 1 amplifier's inverting input; Perhaps:
The sampled point that is positioned at isolating diode (D) anode connects 1: 1 amplifier's inverting input, and the sampled point that is positioned at isolating diode (D) negative electrode connects the normal phase input end of 1: 1 amplifier, and comprises a phase inverter in the final stage of 1: 1 amplifier.
6, the compensating circuit of power output end diode drop as claimed in claim 1, it is characterized in that: described isolating diode (D) is serially connected in power supply output negative terminal (Vo-), and the power supply negative terminal of 1: 1 amplifier (Vee) connects power supply output negative terminal (Vo-) by negative supply; The sampled point that is positioned at isolating diode (D) anode connects the normal phase input end of 1: 1 amplifier, and the sampled point that is positioned at isolating diode (D) negative electrode connects 1: 1 amplifier's inverting input; Perhaps:
The sampled point that is positioned at isolating diode (D) anode connects 1: 1 amplifier's inverting input, and the sampled point that is positioned at isolating diode (D) negative electrode connects the normal phase input end of 1: 1 amplifier, and comprises a phase inverter in the final stage of 1: 1 amplifier.
7, a kind of compensation method of power output end diode drop is characterized in that comprising the steps:
The directly pressure drop at collection isolating diode (D) two ends (V ');
With the pressure drop at isolating diode (D) two ends that collect (V ') through spacer assembly isolate out on the straight edge line pour in down a chimney the loop, regulating device feeds back to output voltage (Vo+) after regulating its amplitude and polarity, obtains adjusted output voltage (Vo+V ');
Adjusted output voltage (Vo+V ') through becoming needed magnitude of voltage (Vo) after isolating diode (D) step-down.
8, the compensation method of power output end diode drop as claimed in claim 7, it is characterized in that described control method is: utilize the positive and negative compensation end (Sense+, Sense-) of power supply that the pressure drop of diode (V ') is superimposed upon on the output voltage, make output voltage directly be adjusted into (Vo+V ').
9, the compensation method of power output end diode drop as claimed in claim 7 is characterized in that described partition method is: utilize 1: 1 amplifier to isolate the just compensation end (Sense+) of sampled point and power supply.
10, the compensation method of power output end diode drop as claimed in claim 7, it is characterized in that described partition method is: utilize 1: 1 amplifier to isolate the just compensation end (Sense+) of sampled point and power supply, this differential amplifier feeds back to negative compensation end (Sense-) with the diode drop that samples (V '), to just compensate end (Sense+) and output cathode short circuit simultaneously, and the power supply negative terminal of differential amplifier is direct or (Vee) connect power supply output negative terminal (Vo-), the power supply end of differential amplifier (Vcc) connects power supply output plus terminal (Vo+) by negative supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031135870A CN100442190C (en) | 2003-01-13 | 2003-01-13 | Compensation circuit and method for diode voltage drop of power supply output terminal |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031135870A CN100442190C (en) | 2003-01-13 | 2003-01-13 | Compensation circuit and method for diode voltage drop of power supply output terminal |
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| CN1450431A true CN1450431A (en) | 2003-10-22 |
| CN100442190C CN100442190C (en) | 2008-12-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB031135870A Expired - Fee Related CN100442190C (en) | 2003-01-13 | 2003-01-13 | Compensation circuit and method for diode voltage drop of power supply output terminal |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101741224B (en) * | 2009-12-30 | 2011-11-30 | 北京东土科技股份有限公司 | Voltage-drop compensation method for power output lines and switch power supply |
| CN107314830A (en) * | 2016-04-26 | 2017-11-03 | Ls 产电株式会社 | Equipment for correcting temperature measurement signal |
| CN109120159A (en) * | 2018-10-16 | 2019-01-01 | 广州金升阳科技有限公司 | A kind of power circuit and power sources in parallel system |
| CN113760033A (en) * | 2021-09-08 | 2021-12-07 | 中国电子科技集团公司第二十四研究所 | Packaging structure of voltage reference chip and output voltage temperature compensation method |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107465181B (en) * | 2017-08-16 | 2018-11-27 | 艾德克斯电子（南京）有限公司 | A kind of high-power DC power supply of band SENSE self-test defencive function |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4000643A (en) * | 1976-03-29 | 1977-01-04 | Honeywell Inc. | Apparatus for producing a compensating voltage |
| WO1989001200A1 (en) * | 1987-07-30 | 1989-02-09 | Hasler Ag | Circuit with compensated internal impedance |
| CN1021682C (en) * | 1990-07-21 | 1993-07-21 | 南昌三星电器厂 | Reactive power compensating system for both high and low voltages |
| CN2290079Y (en) * | 1997-05-16 | 1998-09-02 | 南宁微控高技术有限责任公司 | Combination compensating voltage stabilizer |
| CN2508447Y (en) * | 2001-09-10 | 2002-08-28 | 盛晓义 | High-efficiency power-saver |
-
2003
- 2003-01-13 CN CNB031135870A patent/CN100442190C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101741224B (en) * | 2009-12-30 | 2011-11-30 | 北京东土科技股份有限公司 | Voltage-drop compensation method for power output lines and switch power supply |
| CN107314830A (en) * | 2016-04-26 | 2017-11-03 | Ls 产电株式会社 | Equipment for correcting temperature measurement signal |
| CN107314830B (en) * | 2016-04-26 | 2019-09-03 | Ls 产电株式会社 | Equipment for correcting temperature measurement signal |
| CN109120159A (en) * | 2018-10-16 | 2019-01-01 | 广州金升阳科技有限公司 | A kind of power circuit and power sources in parallel system |
| CN113760033A (en) * | 2021-09-08 | 2021-12-07 | 中国电子科技集团公司第二十四研究所 | Packaging structure of voltage reference chip and output voltage temperature compensation method |
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| Publication number | Publication date |
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| CN100442190C (en) | 2008-12-10 |
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Owner name: YADA POWER SUPPLY PRODUCTS (SHENZHEN) CO., LTD. Free format text: FORMER OWNER: AIMOSHENG NETWORK ENERGY SOURCE CO LTD Effective date: 20150216 |
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Effective date of registration: 20150216 Address after: 518000 Guangdong city of Shenzhen province Baoan District Xin'an road two North 68 Street office Honglang District Industrial Park plant Patentee after: Astec power supply (Shenzhen) Co., Ltd. Patentee after: Huawei Technologies Co., Ltd. Address before: 518057 Nanshan District science and Technology Industrial Park, Guangdong, Shenzhen Branch Road, No. Patentee before: Aimosheng Network Energy Source Co., Ltd. Patentee before: Huawei Technologies Co., Ltd. |
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Granted publication date: 20081210 Termination date: 20170113 |
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