CN102013804B - Method for compensating large-current output voltage accuracy of switching power supply in wide temperature range - Google Patents
Method for compensating large-current output voltage accuracy of switching power supply in wide temperature range Download PDFInfo
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- CN102013804B CN102013804B CN 201010526179 CN201010526179A CN102013804B CN 102013804 B CN102013804 B CN 102013804B CN 201010526179 CN201010526179 CN 201010526179 CN 201010526179 A CN201010526179 A CN 201010526179A CN 102013804 B CN102013804 B CN 102013804B
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Abstract
The invention discloses a method for compensating large-current output voltage accuracy of a switching power supply in a wide temperature range. A compensation component, namely a diode is arranged in an output feedback loop of the switching power supply, and the mode of connecting the diode in the output feedback loop is that: when the output voltage of the switching power supply has a positive temperature coefficient, the diode is connected in series with a resister R2 in the feedback loop, so that the positive pole of the diode is connected with the resistor R2, and the negative pole of the diode is connected with a resister R3, a resister R4, and a three-terminal regulator IC2 in the feedback loop respectively; and when the output voltage of the switching power supply has a negative temperature coefficient, the diode is connected in series with a resister R4 in the feedback loop, so that the negative pole of the diode is connected with the resister R4, and the positive pole of the diode is connected with the resister R3, the resister R2 and the three-terminal regulator IC2 in the feedback loop respectively. By the compensation method, the output voltage accuracy of the switching power supply can be compensated in the wide temperature range and the output voltage accuracy of the switching power supply can be guaranteed.
Description
Technical field
The invention belongs to electronic technology field, relate to a kind of compensation method of Switching Power Supply High-current output wide temperature range output voltage precision.
Background technology
In recent years, along with the expansion of aerospace field, the demand of high-performance DC-DC converter is increased day by day, and high-performance DC-DC converter requires to have high power density, large current path, wide in range characteristics such as working temperature.Switching Power Supply has a lot of technical indicators, output voltage precision wherein, and general provision, its index is less than or equal to 1% under the normal temperature.But during High-current output, existing Switching Power Supply can't guarantee that the output voltage precision under the high and low temperature condition is less than or equal to 1%.
Summary of the invention
In order to overcome above-mentioned problems of the prior art, the purpose of this invention is to provide a kind of compensation method of Switching Power Supply High-current output wide temperature range output voltage precision, under the condition of large-temperature range and High-current output, the switch power source output voltage precision is compensated, be less than or equal to 1% so that the output voltage precision of Switching Power Supply remains.
For achieving the above object, the technical solution adopted in the present invention is, the compensation method of Switching Power Supply High-current output wide temperature range output voltage precision, take the output feedback loop of Switching Power Supply as the basis, an end of an end of the first resistance and the second resistance meets respectively positive voltage+Vout in the output feedback loop of this Switching Power Supply; The other end of the first resistance and the positive pole of light-emitting diode join, the negative pole of light-emitting diode is connected with the negative electrode of three terminal regulator and an end of the 3rd electric capacity respectively, the other end of the 3rd electric capacity is connected with an end of the 3rd resistance, the other end of the second resistance is connected with an end of the 4th resistance, contact between the second resistance and the 4th resistance is connected with the other end of the 3rd resistance and the reference edge of three terminal regulator respectively, and the other end of the anode of three terminal regulator and the 4th resistance meets respectively negative voltage-Vout; In the output feedback loop of Switching Power Supply, increase the compensation components and parts.
The compensation components and parts are diode, the method for attachment of this diode in the output feedback loop:
1) when switch power source output voltage has positive temperature coefficient, diode is connected with the second resistance in the feedback loop, positive pole and the second resistance other end of diode are joined, the negative pole of diode respectively with feedback loop in the reference edge of the other end, the 4th resistance one end and three terminal regulator of the 3rd resistance join;
2) when switch power source output voltage has negative temperature coefficient, diode is connected with the 4th resistance in the feedback loop, negative pole and the 4th resistance one end of diode are joined, the positive pole of diode respectively with feedback loop in the reference edge of the other end, the second resistance other end and three terminal regulator of the 3rd resistance join.
Compensation method of the present invention is to increase a diode in the feedback loop of existing Switching Power Supply, utilize the output voltage precision of the negative temperature coefficient compensated switching power supply of diode, so that no matter the output voltage of Switching Power Supply has positive temperature coefficient or negative temperature coefficient, all can carry out the output voltage accuracy compensation, fundamentally solve the problem of switch power source output voltage precise decreasing under the specified conditions, improved the overall performance of Switching Power Supply.
Description of drawings
Fig. 1 is the compensation principle figure that compensation method of the present invention is adopted when Switching Power Supply has positive temperature coefficient.
Fig. 2 is the compensation principle figure that compensation method of the present invention is adopted when Switching Power Supply has negative temperature coefficient.
Embodiment
The present invention is described in detail below in conjunction with the drawings and specific embodiments.
When Switching Power Supply during in the work of wide temperature range and High-current output state, the intrinsic temperature of components and parts is floated the output voltage precise decreasing that characteristic causes Switching Power Supply, can solve because the intrinsic temperature drift of components and parts causes the problem of output voltage precise decreasing by output voltage accuracy compensation technology, namely in the output feedback loop of Switching Power Supply, increase the compensation components and parts, the plus or minus of the temperature coefficient that has according to switch power source output voltage, by different direction respectively access in the output feedback loop of Switching Power Supply with negative pole the positive pole of these compensation components and parts, output voltage precision to Switching Power Supply compensates, and makes it be less than or equal to 1%.For this reason, the inventive method adopts the method that increases a diode D3 in Switching Power Supply output feedback loop, and the output voltage precision is compensated, and concrete grammar is:
1) when switch power source output voltage has positive temperature coefficient, diode D3 is connected with the resistance R 2 in the feedback loop, as shown in Figure 1, positive pole and the resistance R 2 of diode D3 are joined, the negative pole of diode D3 respectively with feedback loop in resistance R 3, resistance R 4 and three terminal regulator IC2 join;
2) when switch power source output voltage has negative temperature coefficient, diode D3 is connected with the resistance R 4 in the feedback loop, as shown in Figure 2, negative pole and the resistance R 4 of diode D3 are joined, the positive pole of diode D3 respectively with feedback loop in resistance R 3, resistance R 2 and three terminal regulator IC2 join.
Compensation method of the present invention utilizes the negative temperature coefficient compensation output voltage precision of diode D3.If the conducting voltage of diode D3 is V
D3, so,
When switch power source output voltage had positive temperature coefficient, the output voltage V out after the compensation by formula (1) calculated:
Vout=V
ref(1+R2/R4+V
d3/V
ref) （1）
When switch power source output voltage had negative temperature coefficient, the output voltage V out after the compensation by formula (2) calculated:
Vout=V
ref+(V
ref-V
d3)R2/R4 （2）
In formula (1) and the formula (2), V
RefThe reference voltage of three terminal regulator IC2 in the expression feedback loop; R2 represents the resistance of resistance R 2 in the feedback loop; R4 represents the resistance of resistance R 4 in the feedback loop.
Can find out from formula (1), if when the output voltage of Switching Power Supply has positive temperature coefficient, under the hot operation state, because diode D3 has negative temperature coefficient, V
D3Reduce, so that Vout reduces, thereby compensated owing to output voltage has switch power source output voltage precision that positive temperature coefficient causes greater than 1% problem, guaranteed that the output voltage precision also can be less than or equal 1% when the hot operation state.
In like manner, can find out from formula (2), if when the output voltage of Switching Power Supply has negative temperature coefficient, under the hot operation state, because diode has negative temperature coefficient, V
D3Reduce, so that Vout increases, compensated owing to output voltage has switch power source output voltage precision that negative temperature coefficient causes greater than 1% problem, guaranteed that the output voltage precision can be less than or equal 1% when the hot operation state.
Can find out from top discussion no matter switch power source output voltage has positive temperature coefficient or negative temperature coefficient, all is at the hot operation state, diode D3 has negative temperature coefficient, V
D3Reduce.When Switching Power Supply is worked under low-temperature condition, because diode D3 has negative temperature coefficient, its conducting voltage V
D3Can increase when low temperature, therefore, formula (1) and formula (2) are equally applicable to the low-temperature working state, and under the low-temperature working state, the connection of diode D3 compensation output voltage precision is constant.
Embodiment
The switch power source output voltage required precision is Vout=36V ± 0.3V, and Iout=4A tests at the output voltage under the different temperatures existing Switching Power Supply, obtains output voltage values as shown in table 1.
The output voltage values of Switching Power Supply under table 1 different temperatures
| Input voltage range (V) | 18 | 24 | 36 |
| Normal temperature (+25 ℃, fully loaded) | 36.06 | 36.06 | 36.05 |
| Low temperature (55 ℃, fully loaded) | 35.61 | 35.61 | 35.61 |
| High temperature (+85 ℃, fully loaded) | 36.33 | 36.32 | 36.32 |
Adopt compensation method of the present invention that above-mentioned Switching Power Supply is carried out the output voltage accuracy compensation, this Switching Power Supply after the compensation is tested at the output voltage under the different temperatures, obtain output voltage values as shown in table 2.
Table 2 adopts the output voltage values of the rear different temperatures Switching Power Supply of the inventive method compensation
| Input voltage range (V) | 18 | 24 | 36 |
| Normal temperature (+25 ℃, fully loaded) | 36.04 | 36.06 | 36.05 |
| Low temperature (55 ℃, fully loaded) | 36.11 | 36.10 | 36.13 |
| High temperature (+85 ℃, fully loaded) | 35.85 | 35.85 | 35.85 |
As can be seen from Table 1, switch power source output voltage has positive temperature coefficient, that is: output voltage increases during high temperature, and output voltage reduces during low temperature, and output voltage has all exceeded ± the output voltage precision of 0.3V during high low temperature, need to carry out temperature-compensating.After adopting compensation method of the present invention to compensate, output voltage values such as table 2, as can be seen from Table 2, after adopting compensation method compensation of the present invention, it is large that the output voltage of this Switching Power Supply becomes when low temperature, diminish during high temperature, and all can satisfy ± the output voltage precision index of 0.3V, reached the purpose of output voltage accuracy compensation.
The inventive method is utilized the negative temperature coefficient of diode, the switch power source output voltage precision is carried out temperature-compensating in wide temperature range, make the output voltage precision and stability of Switching Power Supply higher, guarantee the requirement of aerospace field to the Switching Power Supply high reliability, can adapt to following demand to high-performance DC-DC converter.
Claims (1)
1. the compensation method of Switching Power Supply High-current output wide temperature range output voltage precision, take the output feedback loop of Switching Power Supply as the basis, an end of an end of the first resistance (R1) and the second resistance (R2) meets respectively positive voltage+Vout in the output feedback loop of this Switching Power Supply; The positive pole of the other end of the first resistance (R1) and light-emitting diode (IC1B) joins, the negative pole of light-emitting diode (IC1B) is connected with the negative electrode of three terminal regulator (IC2) and an end of the 3rd electric capacity (C3) respectively, the other end of the 3rd electric capacity (C3) is connected with an end of the 3rd resistance (R3), the other end of the second resistance (R2) is connected with an end of the 4th resistance (R4), contact between the second resistance (R2) and the 4th resistance (R4) is connected with the other end of the 3rd resistance (R3) and the reference edge of three terminal regulator (IC2) respectively, and the other end of the anode of three terminal regulator (IC2) and the 4th resistance (R4) meets respectively negative voltage-Vout; It is characterized in that, in the output feedback loop of this Switching Power Supply, increase by way of compensation components and parts of diode, the method for attachment of this diode in the output feedback loop of Switching Power Supply:
1) when switch power source output voltage has positive temperature coefficient, diode is connected with the second resistance (R2) in the feedback loop, positive pole and the second resistance (R2) other end of diode are joined, the negative pole of diode respectively with feedback loop in the reference edge of the other end, the 4th resistance (R4) end and three terminal regulator (IC2) of the 3rd resistance (R3) join;
2) when switch power source output voltage has negative temperature coefficient, diode is connected with the 4th resistance (R4) in the feedback loop, negative pole and the 4th resistance (R4) end of diode are joined, the positive pole of diode respectively with feedback loop in the reference edge of the other end, the second resistance (R2) other end and three terminal regulator (IC2) of the 3rd resistance (R3) join.
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|---|---|---|---|
| CN 201010526179 CN102013804B (en) | 2010-11-01 | 2010-11-01 | Method for compensating large-current output voltage accuracy of switching power supply in wide temperature range |
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| CN 201010526179 CN102013804B (en) | 2010-11-01 | 2010-11-01 | Method for compensating large-current output voltage accuracy of switching power supply in wide temperature range |
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| CN102013804B true CN102013804B (en) | 2013-04-17 |
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| CN104460815B (en) * | 2014-04-30 | 2016-06-22 | 贵州航天凯山石油仪器有限公司 | A kind of high temperature width input high-precision power |
| CN107681872A (en) * | 2017-09-30 | 2018-02-09 | 厦门理工学院 | A kind of method for suppressing Switching Power Supply temperature drift |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2624193Y (en) * | 2003-05-06 | 2004-07-07 | 北京莱姆电子有限公司 | Temperature compensation circuit |
| CN101330252A (en) * | 2007-06-19 | 2008-12-24 | 钰瀚科技股份有限公司 | DC-DC converter with temperature compensating circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2624193Y (en) * | 2003-05-06 | 2004-07-07 | 北京莱姆电子有限公司 | Temperature compensation circuit |
| CN101330252A (en) * | 2007-06-19 | 2008-12-24 | 钰瀚科技股份有限公司 | DC-DC converter with temperature compensating circuit |
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