CN100442189C - Electric current loop control method and system for power supply device - Google Patents
Electric current loop control method and system for power supply device Download PDFInfo
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- CN100442189C CN100442189C CNB2006100343026A CN200610034302A CN100442189C CN 100442189 C CN100442189 C CN 100442189C CN B2006100343026 A CNB2006100343026 A CN B2006100343026A CN 200610034302 A CN200610034302 A CN 200610034302A CN 100442189 C CN100442189 C CN 100442189C
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Abstract
The present invention relates to a current loop control method and a system for a power supply device. In order to solve the contradiction between holding the stability of a current loop and increasing the gain of the current loop in the existing current loop control system, the present invention is added with a wave filter, a subtractor, a voltage regulator and an adder on the basis of the traditional single current regulator, wherein the wave filter is used for carrying out wave filtering on a voltage sampling instantaneous value, and the subtractor is used for working out the voltage sampling error between the sampling average value and the instantaneous value of the output voltage of the wave filter. The voltage regulator realizes voltage regulation according to a given regulation signal of a transformer and a voltage sampling error and outputs a given signal AC component of the current loop. The adder outputs a current regulator given signal according to the superposition of the DC component and the AC component of the given signal of the current loop. Thereafter, the current regulator realizes the current regulation so as to obtain a current regulator output signal. The present invention has the advantage that the phone weighted noise is caused to satisfy the requirement through the regulation of the current regulator and the voltage regulator.
Description
Technical field
The present invention relates to supply unit, more particularly, relate to a kind of current loop control method and system that is used for supply unit.
Background technology
In power supply module for communication, a kind of current limliting duty is arranged usually, promptly when output current reached setting value, module was operated in the constant state of output current.At the limited current state of power module, industry generally adopts the current loop control system of single current regulator, and its principle as shown in Figure 1.
In current regulator shown in Figure 1 101, I-ref is the given signal of current regulator, and I-det is a current sampling signal, and IV is the current regulator output signal.Z1I wherein, Z2I represent the capacitor resistor unit that uses in the current regulator, specifically can be referring to Fig. 5 to Figure 10.Wherein, current regulator 101 is realized Current Regulation according to given signal I-ref of current regulator and current sampling signal I-det, and output current regulator output signal IV.
For the current loop control system that uses this single current regulator, when power supply module for communication when being in the current limliting duty, at the 300-3400Hz frequency band, require the output terminal phone weighted noise of communication power supply to be equal to or less than 2.0mv.In order to satisfy this requirement, must improve the gain of electric current loop at the 300-3400Hz frequency band.But when improving the gain of electric current loop, may improve the bandwidth of electric current loop, influence the phase margin of current loop, thereby the stability of sacrifice electric current loop at the 300-3400Hz frequency band.Like this, between the gain of holding current ring stability and raising electric current loop 300-3400Hz frequency band, just produced conflicting contradiction.
Fig. 2 is that the manual of electric current loop photo of original test drawn, and at this moment, the gain of electric current loop 300-3400Hz frequency band can't make the phone weighted noise index meet the requirements, and can see that in the gain trace zero passage phase margin of current loop is about 81deg.Fig. 3 is manual drawing of the later electric current loop photo of the gain that improves electric current loop 300-3400Hz frequency band, and at this moment, the phone weighted noise index meets the requirements, the 36deg but the phase margin that can see current loop in the gain trace zero passage is only had an appointment.The index of the phase margin phase margin that to be the measurement system have near critical stable state fashion, the stability of the big more system of phase margin is good more; Otherwise the phase margin stability of mini system more is poor more.From the contrast of Fig. 2 and 3, when improving the gain of electric current loop 300-3400Hz frequency band, sacrificed the stability of electric current loop as can be seen.
In order to address the above problem, the method that industry generally adopts is on the basis that guarantees electric current loop stability, and at output port and connect electric capacity, satisfying the requirement to phone weighted noise, but above-mentioned solution can increase cost of products.
Summary of the invention
At the above-mentioned defective of prior art, the present invention will solve the holding current ring stability of existing current loop control system existence and the contradiction between the raising current loop gain effectively with lower cost.
For solving the problems of the technologies described above, the invention provides a kind of current loop control method that is used for supply unit, comprising following steps:
(1) output voltage is sampled, obtain voltage sample instantaneous value and voltage sample mean value;
(2) deduct described voltage sample mean value with described voltage sample instantaneous value, obtain the voltage sample error;
(3) regulate given signal and described voltage sample error according to predetermined voltage regulator, undertaken exporting after the voltage-regulation, obtain the given signal communication component of electric current loop by voltage regulator;
(4) with given signal DC component of electric current loop and the addition of the given signal communication component of described electric current loop, obtain the given signal of current regulator;
(5) according to current sampling signal and the given signal of described current regulator, carry out Current Regulation, to obtain the current regulator output signal by current regulator.
In described step of the present invention (1), can be by the voltage sample instantaneous value being carried out filtering to obtain voltage sample mean value.
In addition, the present invention also provides a kind of current loop control system that is used for supply unit, comprising current regulator, also comprises wave filter, subtracter, voltage regulator and totalizer; Wherein, described wave filter carries out filtering with the output voltage sample mean to the voltage sample instantaneous value; Described subtracter is according to the difference output voltage sampling error of described voltage sample instantaneous value and voltage sample mean value; Described voltage regulator regulates given signal according to predetermined voltage regulator and described voltage sample error realizes voltage-regulation and the given signal communication component of output current ring; Described totalizer is according to the given signal of stack output current regulator of given signal DC component of electric current loop and the given signal communication component of described electric current loop; Described current regulator realizes that according to current sampling signal and the given signal of described current regulator Current Regulation is to obtain the current regulator output signal.
Among the present invention, described voltage regulator comprises first operational amplifier, first capacitor resistor unit and second capacitor resistor unit; Described first capacitor resistor unit is connected between the negative input end of the output terminal of described totalizer and described operational amplifier; Described second capacitor resistor unit is connected between the negative input end and output terminal of described first operational amplifier; The positive input terminal of described first operational amplifier is used to introduce described voltage regulator and regulates given signal; Described current regulator comprises second operational amplifier, the 3rd capacitor resistor unit and the 4th capacitor resistor unit; One end of described the 3rd capacitor resistor unit is used to introduce described current sampling signal, and the other end is connected to the negative input end of described second operational amplifier; Described the 4th capacitor resistor unit is connected between the negative input end and output terminal of described second operational amplifier; The positive input terminal of described second operational amplifier is connected with the output terminal of described totalizer, and output terminal is then exported described current regulator output signal.
Wherein, described first capacitor resistor unit can comprise that resistance R 1, the second capacitor resistor unit can comprise the resistance R 2 and the capacitor C 1 of mutual series connection; Described the 3rd capacitor resistor unit can comprise that resistance R 3, the four capacitor resistor units can comprise the resistance R 4 and the capacitor C 2 of mutual series connection.On this basis, also can increase or reduce electric capacity or resistance at each capacitor resistor unit.
Owing to taked technique scheme, current loop control method of the present invention and system rely on the problem that the adjusting of current regulator is solved phone weighted noise no longer merely, but solve the problem of phone weighted noise by the adjusting to current regulator and voltage regulator.When solving the problem of phone weighted noise, gain that can the regulation voltage regulator, and needn't improve the current regulator gain of electric current loop at the 300-3400Hz frequency band, so just solve holding current ring stability that exists in the prior art and the problem that improves electric current loop mutual contradiction between the gain of 300-3400Hz frequency band.And, to compare with industry scheme at present generally that adopt and that connect electric capacity, the Material Cost of this current loop control system decreases.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is the schematic diagram of single current regulator current loop control of the prior art system;
Fig. 2 is the working waveform figure of current loop control system shown in Figure 1 when the current regulator gain of 300-3400Hz frequency band is low;
Fig. 3 is the oscillogram after the current regulator gain with current loop control shown in Figure 1 system improves;
Fig. 4 is the schematic diagram of current loop control of the present invention system;
Fig. 5 to Figure 10 is respectively the circuit diagram of the different embodiment of current loop control shown in Figure 4 system.
Embodiment
As shown in Figure 4, the present invention adopts wave filter 401, totalizer 402, voltage regulator 403, subtracter 404 and current regulator 405 to constitute a kind of novel current loop control system.Z1I wherein, Z2I represent that the capacitor resistor unit that uses in the current regulator, Z1V, Z2V represent the resistance electric unit that uses in the voltage regulator, specifically can be referring to Fig. 5 to Figure 10.IV among Fig. 4 is the current regulator output signal, I-ref is the given signal of current regulator, I-ref1 is the given signal communication component of electric current loop, I-ref2 is the given signal DC component of electric current loop, I-det is a current sampling signal, and V-ref is the given signal of voltage regulator, and V-sam is the voltage sample instantaneous value, V-avg is a voltage sample mean value, and V-err is the voltage sample error.The principle of work of this current loop control system is as follows:
Earlier output voltage is sampled, sampled result is defined as voltage sample instantaneous value V-sam;
Utilize 401 pairs of voltage sample instantaneous values of wave filter V-sam to carry out filtering then, the result of wave filter output is defined as voltage sample mean value V-avg;
Utilize subtracter 402 to obtain voltage sample error V-err between voltage sample instantaneous value V-sam and the voltage sample mean value V-avg then;
Use voltage regulator 403 to realize voltage-regulation then, obtain the given signal communication component of electric current loop I-ref1 according to given signal V-ref of voltage regulator (this signal is given by whole supply unit system) and voltage sample error V-err;
Utilize totalizer 404 to get the given signal I-ref of the stack amount of the given signal DC component of electric current loop I-ref2 (this signal is also given by whole supply unit system) and the given signal communication component of electric current loop I-ref1 again as current regulator 404;
At last, 404 couples of current sampling signal I-det regulate by current regulator, obtain current regulator output signal IV.
Compare with the current loop control system of single current regulator 101 shown in Figure 1, current loop control of the present invention system can not rely on the problem that the adjusting of current regulator 404 is solved phone weighted noise merely, but solves the problem of phone weighted noise by the adjusting to current regulator 404 and voltage regulator 403.Therefore, when solving the problem of phone weighted noise, gain that can regulation voltage regulator 403, and needn't improve the current regulator gain of electric current loop at the 300-3400Hz frequency band.So just solve the holding current ring stability that exists in the prior art and improved the contradiction of electric current loop between the gain of 300-3400Hz frequency band.
During concrete enforcement, the realization of wave filter 401 wherein, totalizer 402, voltage regulator 403, subtracter 404 and current regulator 405 can adopt hardware circuit or software to realize.
Be illustrated in figure 5 as a preferred embodiment of the present invention, wherein, comprise first operational amplifier in the voltage regulator, first capacitor resistor unit of forming by resistance R 1, and second capacitor resistor unit of forming by resistance R 2 and capacitor C 1; Resistance R 1 is connected between the negative input end of the output terminal of totalizer and first operational amplifier, and resistance R 2 and capacitor C 1 are serially connected with between the negative input end and output terminal of first operational amplifier.Comprise second operational amplifier in the current regulator, the 3rd capacitor resistor unit of forming by resistance R 3, and the 4th capacitor resistor unit of forming by resistance R 4 and capacitor C 2; One of resistance R 3 is terminated at the negative input end of second operational amplifier, and the other end is used to introduce current sampling signal I-det, and resistance R 4 and capacitor C 3 are serially connected with between the negative input end and output terminal of second operational amplifier.
Be illustrated in figure 6 as another preferred embodiment of the present invention, as can be seen from the figure, voltage regulator has wherein increased a capacitor C 5 in parallel with resistance R 1 on the basis of Fig. 5; Current regulator has then increased a capacitor C 6 in parallel with resistance R 3 on the basis of Fig. 5.
Be illustrated in figure 7 as another preferred embodiment of the present invention, as can be seen from the figure, voltage regulator has wherein increased a capacitor C 3 in parallel with resistance R 2 on the basis of Fig. 5; Current regulator has then increased a capacitor C 4 in parallel with resistance R 4 on the basis of Fig. 5.
Be illustrated in figure 8 as another preferred embodiment of the present invention, as can be seen from the figure, voltage regulator has wherein increased the series arm of being made up of resistance R 5 and capacitor C 5 in parallel with resistance R 1 on the basis of Fig. 5, and the capacitor C 3 that is in parallel with the series arm of resistance R 2 and C1; Then increased the series arm of forming by resistance R 6 and capacitor C 6 in parallel with resistance R 3 in the current regulator, and the capacitor C 4 that is in parallel with the series arm of resistance R 4 and C2.
Be illustrated in figure 9 as another preferred embodiment of the present invention, as can be seen from the figure, compare with Fig. 5, resistance R 2 in its voltage regulator and capacitor C 1 are relations in parallel; Resistance R 4 in the current regulator and capacitor C 2 also are relations in parallel.
Be another preferred embodiment of the present invention as shown in figure 10, as can be seen from the figure, compare, lacked capacitor C 1 in its voltage regulator with Fig. 5; Current regulator then remains unchanged.
During concrete enforcement, first, second, third, fourth capacitor resistor unit wherein can also have other distortion.
Claims (10)
1, a kind of current loop control method that is used for supply unit comprises the steps:
(1) output voltage is sampled, obtain voltage sample instantaneous value and voltage sample mean value;
(2) deduct described voltage sample mean value with described voltage sample instantaneous value, obtain the voltage sample error;
It is characterized in that, also comprise the steps:
(3) regulate given signal and described voltage sample error according to predetermined voltage regulator, undertaken exporting after the voltage-regulation, obtain the given signal communication component of electric current loop by voltage regulator;
(4) with given signal DC component of electric current loop and the addition of the given signal communication component of described electric current loop, obtain the given signal of current regulator;
(5) according to current sampling signal and the given signal of described current regulator, carry out Current Regulation, to obtain the current regulator output signal by current regulator;
2, method according to claim 1 is characterized in that: in the described step (1), by the voltage sample instantaneous value being carried out filtering to obtain voltage sample mean value.
3, a kind of current loop control system that is used for supply unit comprises current regulator, also comprises wave filter, subtracter, voltage regulator and totalizer; Wherein,
Described wave filter carries out filtering with the output voltage sample mean to the voltage sample instantaneous value;
Described subtracter is according to the difference output voltage sampling error of described voltage sample instantaneous value and voltage sample mean value;
It is characterized in that described voltage regulator regulates given signal according to predetermined voltage regulator and described voltage sample error realizes voltage-regulation and the given signal communication component of output current ring;
Described totalizer is according to the given signal of stack output current regulator of given signal DC component of electric current loop and the given signal communication component of described electric current loop;
Described current regulator realizes that according to current sampling signal and the given signal of described current regulator Current Regulation is to obtain the current regulator output signal.
4, the current loop control system that is used for supply unit according to claim 3 is characterized in that,
Described voltage regulator comprises first operational amplifier, first capacitor resistor unit and second capacitor resistor unit; Described first capacitor resistor unit is connected between the negative input end of the output terminal of described totalizer and described operational amplifier; Described second capacitor resistor unit is connected between the negative input end and output terminal of described first operational amplifier; The positive input terminal of described first operational amplifier is used to introduce described voltage regulator and regulates given signal;
Described current regulator comprises second operational amplifier, the 3rd capacitor resistor unit and the 4th capacitor resistor unit; One end of described the 3rd capacitor resistor unit is used to introduce described current sampling signal, and the other end is connected to the negative input end of described second operational amplifier; Described the 4th capacitor resistor unit is connected between the negative input end and output terminal of described second operational amplifier; The positive input terminal of described second operational amplifier is connected with the output terminal of described totalizer, and output terminal is then exported described current regulator output signal.
5, the current loop control system that is used for supply unit according to claim 4 is characterized in that,
Described first capacitor resistor unit comprises that resistance R 1, the second capacitor resistor unit comprises the resistance R 2 and the capacitor C 1 of mutual series connection;
Described the 3rd capacitor resistor unit comprises that resistance R 3, the four capacitor resistor units comprise the resistance R 4 and the capacitor C 2 of mutual series connection.
6, the current loop control system that is used for supply unit according to claim 5 is characterized in that,
Described first capacitor resistor unit also comprises the capacitor C 5 in parallel with described resistance R 1;
Described the 3rd capacitor resistor unit also comprises the capacitor C 6 in parallel with described resistance R 3.
7, the current loop control system that is used for supply unit according to claim 5 is characterized in that,
Described second capacitor resistor unit also comprises the capacitor C 3 in parallel with described resistance R 2;
Described the 4th capacitor resistor unit also comprises the capacitor C 4 in parallel with described resistance R 4.
8, the current loop control system that is used for supply unit according to claim 5 is characterized in that,
The series arm that described first capacitor resistor unit also comprises is in parallel with described resistance R 1, be made up of resistance R 5 and capacitor C 5;
Described second capacitor resistor unit also comprises the capacitor C 3 that the series arm with described resistance R 2 and C1 is in parallel;
The series arm that described the 3rd capacitor resistor unit also comprises is in parallel with described resistance R 3, be made up of resistance R 6 and capacitor C 6;
Described the 4th capacitor resistor unit also comprises the capacitor C 4 that the series arm with described resistance R 4 and C2 is in parallel.
9, the current loop control system that is used for supply unit according to claim 4 is characterized in that,
Described first capacitor resistor unit comprises that resistance R 1, the second capacitor resistor unit comprises resistance R parallel with one another 2 and capacitor C 1;
Described the 3rd capacitor resistor unit comprises that resistance R 3, the four capacitor resistor units comprise the resistance R 4 and the capacitor C 2 of mutual series connection.
10, the current loop control system that is used for supply unit according to claim 4 is characterized in that,
Described first capacitor resistor unit comprises that resistance R 1, the second capacitor resistor unit comprises resistance R 2;
Described the 3rd capacitor resistor unit comprises that resistance R 3, the four capacitor resistor units comprise the resistance R 4 and the capacitor C 2 of mutual series connection.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2006100343026A CN100442189C (en) | 2006-03-09 | 2006-03-09 | Electric current loop control method and system for power supply device |
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| CNB2006100343026A CN100442189C (en) | 2006-03-09 | 2006-03-09 | Electric current loop control method and system for power supply device |
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| CN100442189C true CN100442189C (en) | 2008-12-10 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87209231U (en) * | 1987-06-19 | 1987-12-30 | 核工业部北京第五研究所 | Pulse width-modulation & photoelectric coupled analogue signal isolator |
| US5137119A (en) * | 1990-09-28 | 1992-08-11 | Otis Elevator Company | Adaptive digital armature current control method for ward-leonard elevator drives using an SCR generator field converter |
| CN1368788A (en) * | 2001-02-02 | 2002-09-11 | 东芝株式会社 | Power change device |
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2006
- 2006-03-09 CN CNB2006100343026A patent/CN100442189C/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87209231U (en) * | 1987-06-19 | 1987-12-30 | 核工业部北京第五研究所 | Pulse width-modulation & photoelectric coupled analogue signal isolator |
| US5137119A (en) * | 1990-09-28 | 1992-08-11 | Otis Elevator Company | Adaptive digital armature current control method for ward-leonard elevator drives using an SCR generator field converter |
| CN1368788A (en) * | 2001-02-02 | 2002-09-11 | 东芝株式会社 | Power change device |
Non-Patent Citations (2)
| Title |
|---|
| 电流环控制的降压PWM开关电源系统的建模分析. 吴霜菊等.电子器件，第26卷第4期. 2003 |
| 电流环控制的降压PWM开关电源系统的建模分析. 吴霜菊等.电子器件，第26卷第4期. 2003 * |
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Address after: Nanshan District Xueyuan Road in Shenzhen city of Guangdong province 518055 No. 1001 Nanshan Chi Park B2 building 1-4 floor, building 6-10 Patentee after: Vitamin Technology 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. |