CN102055324A - Power control device and method using integral circuit - Google Patents
Power control device and method using integral circuit Download PDFInfo
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- CN102055324A CN102055324A CN2011100046764A CN201110004676A CN102055324A CN 102055324 A CN102055324 A CN 102055324A CN 2011100046764 A CN2011100046764 A CN 2011100046764A CN 201110004676 A CN201110004676 A CN 201110004676A CN 102055324 A CN102055324 A CN 102055324A
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Abstract
The invention discloses a power control device and method using an integral circuit. The power control device comprises a driving circuit which comprises an error amplifier and a PWM (pulse-width modulation) comparator; the output end of the PWM comparator is connected with an RS (reset-set) trigger; the input end of the error amplifier is connected with a detecting voltage and a reference voltage; the output end of the error amplifier is connected with the input end of the PWM comparator via the integral circuit. The method comprises the following steps: comparing an average value of a signal after comparing the detecting voltage and the reference voltage with a ramp signal; and controlling a switch tube by driving so as to control a power circuit. According to the invention, the precision of the control signal can be improved, and the performance and service life of the integral power supply can be improved.
Description
Technical field
The present invention relates to a kind of power control circuit, relate in particular to a kind of power control and method that adopts integrating circuit.
Background technology
Along with the concern of new forms of energy and energy-saving and emission-reduction, more and more higher requirement has been proposed for the service efficiency and the precision of power supply.For example, for cold light source, high-power H BLED lamp is compared with traditional fluorescent lamp, its energy-saving and environmental protection, characteristics such as efficient form the focus of paying close attention to into people, along with the day by day rising of people to HB LED attention degree, the performance requirement of led drive circuit is also more and more higher, and is because the variation in output current size can influence the life-span of LED lamp, therefore also apparent more important to the precision of output current.
The chip for driving circuit of comparative maturity in the prior art mostly adopts the control model of peak current.
As shown in Figure 1, be the application of peak current control model in common BUCK topological structure, the pairing transient current of different induction value L, inductance L is big more as can be seen from Figure, and its average current is just more near peak current.
As shown in Figure 2, it is the control circuit module schematic diagram of peak current control model correspondence, the signal Vsense put-into error amplifier EA that feeds back, compare with reference voltage Vref, Shu Chu signal directly inserts the PWM comparator then, after comparing with ramp signal, split through overdriving and to close pipe and control, this is the major control principle of peak-current mode.
There is following shortcoming at least in above-mentioned prior art:
The current precision error generally about 30%, can influence the life-span of power supply;
Output current can be limited by inductance value and the input voltage of inductor L simultaneously, not only can reduce the accuracy of output current, and the actual current that provides is less than the peak current in when design.For the average current that makes system output equals the current value of its design, inductance must be infinitely great, obviously very unrealistic in theory.
Summary of the invention
The purpose of this invention is to provide a kind of power control and method that can improve the control signal precision, improve the whole power source performance and the employing integrating circuit in life-span.
The objective of the invention is to be achieved through the following technical solutions:
The power control of employing integrating circuit of the present invention, comprise drive circuit, described drive circuit comprises error amplifier and PWM comparator, the output of described PWM comparator is connected with rest-set flip-flop, the input of described error amplifier inserts and detects voltage and reference voltage, and the output of described error amplifier is connected by the input of integrating circuit with the PWM comparator.
The power control of above-mentioned employing integrating circuit of the present invention is realized the method for power supply control, with after detecting the average of voltage and the reference voltage signal after relatively and ramp signal and comparing, split the pass pipe through overdriving and control, realize control power circuit.
As seen from the above technical solution provided by the invention, the power control and the method for the employing integrating circuit that the embodiment of the invention provides, because the output of error amplifier is connected by the input of integrating circuit with the PWM comparator, with after detecting the average of voltage and the reference voltage signal after relatively and ramp signal and comparing, split the pass pipe through overdriving and control, realize control power circuit.The control signal precision be can improve, whole power source performance and life-span improved.
Description of drawings
In order to be illustrated more clearly in the technical scheme of the embodiment of the invention, the accompanying drawing of required use is done to introduce simply in will describing embodiment below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite of not paying creative work, can also obtain other accompanying drawings according to these accompanying drawings.
Fig. 1 is a peak current control model schematic diagram in the prior art;
Fig. 2 is the control circuit module schematic diagram of peak current control model correspondence in the prior art;
Fig. 3 is average current control mode schematic diagram among the present invention;
Fig. 4 is the drive circuit schematic diagram among the present invention;
Fig. 5 is the main oscillogram of the drive circuit among the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on embodiments of the invention, those of ordinary skills belong to protection scope of the present invention not making the every other embodiment that is obtained under the creative work prerequisite.
The power control of employing integrating circuit of the present invention, its preferable embodiment is: comprise drive circuit, described drive circuit comprises error amplifier and PWM comparator, the output of described PWM comparator is connected with rest-set flip-flop, the input of described error amplifier inserts and detects voltage and reference voltage, and the output of described error amplifier is connected by the input of integrating circuit with the PWM comparator.
Described integrating circuit can comprise a resistance and two electric capacity of the output that is connected described error amplifier, one of them electric capacity directly is connected with the output of described error amplifier, and another electric capacity is connected with the output of described error amplifier with described resistance series connection back.Also can adopt other integrating circuit.
The power control of above-mentioned employing integrating circuit of the present invention is realized the method for power supply control, its preferable embodiment is: after will detecting the average of voltage and the reference voltage signal after relatively and ramp signal and comparing, split the pass pipe through overdriving and control, realize control power circuit.
The average of described detection voltage and the reference voltage signal after relatively obtains by described detection voltage and the reference voltage signal after is relatively carried out integration.
Described detection voltage and the reference voltage signal after relatively can be current signal or other signal.
Introduce integrating circuit at error amplifier EA output among the present invention, can regard average current as through the output signal behind the integration like this, adopt this average current to carry out circuit control, can significantly improve current precision, improve the whole power source performance and the purpose in life-span thereby reach.Compare peak-current mode, precision is improved under the average-current mode, and is insensitive to inductance, can improve the life-span of LED lamp greatly.
Below control principle of the present invention is described in detail:
As shown in Figure 3, under average current control mode, no matter the size of inductance L value, its average current value all equates.Can find out and utilize average current control mode, the electric current and the actual electric current that the provides problem devious of design under the former peak value current control mode can be provided, thereby can guarantee the precision of output current.
As shown in Figure 4, schematic diagram for drive circuit of the present invention, among Fig. 4 shown in the oval frame of broken lines for providing average current to regulate the core circuit part of pattern, adopt integrating circuit, error is carried out time integral, promptly detect voltage Vsense (t) and the integration of reference voltage Vref difference on electric capacity, because reference voltage Vref is a steady state value, so be equivalent to the time of integration T*D (D is a duty cycle of switching, T is the cycle) in the time, make the mean value of Vsense (t) and the error between the reference voltage drop to minimum.Mainly contain two operating states:
First operating state begins to chip power, rest-set flip-flop set (Q is a high level), the switching tube conducting, detect voltage Vsense (t) because the effect approximately linear of inductance L rising in the peripheral topological structure is controlled voltage Vref with benchmark and carried out the difference integration, be i.e. V among Fig. 4
EA(t) be its integral result.Shown in Fig. 5 (b), V
EA(t) rising along with Vsense (t) diminishes after the change greatly earlier, and when the average voltage of Vsense (t) equaled reference voltage V ref, circuit entered second operating state;
Second operating state, rest-set flip-flop reset (Q is a low level), and the OFF time period shown in Fig. 5 (d), promptly switching tube turn-offs, V
EA(t) remain unchanged, maintain power tube and turn-off pairing V constantly
EA(t) value, V as shown in Fig. 5 (b)
EA(t) waveform changes up to next operating state.
Switch turn-offs constantly by V
EA(t) and Vslope (t) decision, the whole system operation process can be described by two top states.This is the conducting control mode of a kind of fixed cycle, in this way can be so that when stable state, shown in Fig. 5 (a), detect the mean value of voltage Vsense (t) during switch conduction and equal reference voltage Vref, thereby can realize the control of average-current mode.
Again as shown in Figure 4, the output of error amplifier EA is made up of a resistance R 2 and two capacitor C 1, C2, forms two limits and a zero point, and its frequency domain characteristic can be expressed as with following formula:
Can find out that from formula (1) be pairing zero point:
Limit is: 0 He
Zeroaxial reasonable insertion can be eliminated the phase margin of the difference that time limit brings to circuit, thereby can regulate for the stability of loop, so the circuit stability of correspondence of the present invention is higher.By reasonable setting,, thereby circuit stability is guaranteed to the adjustment of dead-center position to capacitor C 1, C2 and resistance R 2.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claims.
Claims (5)
1. power control that adopts integrating circuit, comprise drive circuit, described drive circuit comprises error amplifier and PWM comparator, the output of described PWM comparator is connected with rest-set flip-flop, the input of described error amplifier inserts and detects voltage and reference voltage, it is characterized in that the output of described error amplifier is connected by the input of integrating circuit with the PWM comparator.
2. the power control of employing integrating circuit according to claim 1, it is characterized in that, described integrating circuit comprises a resistance and two electric capacity of the output that is connected described error amplifier, one of them electric capacity directly is connected with the output of described error amplifier, and another electric capacity is connected with the output of described error amplifier with described resistance series connection back.
3. the power control of claim 1 or 2 described employing integrating circuit is realized the method for power supply control, it is characterized in that, with after detecting the average of voltage and the reference voltage signal after relatively and ramp signal and comparing, split the pass pipe through overdriving and control, realize control power circuit.
4. the method for realization power supply according to claim 3 control is characterized in that, the average of described detection voltage and the reference voltage signal after relatively obtains by described detection voltage and the reference voltage signal after is relatively carried out integration.
5. the method for realization power supply according to claim 4 control is characterized in that, described detection voltage and the reference voltage signal after relatively is a current signal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011100046764A CN102055324A (en) | 2011-01-11 | 2011-01-11 | Power control device and method using integral circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011100046764A CN102055324A (en) | 2011-01-11 | 2011-01-11 | Power control device and method using integral circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103987150A (en) * | 2013-02-08 | 2014-08-13 | 朗捷科技股份有限公司 | Anti-flicker double-loop LED drive circuit |
| CN104219832A (en) * | 2014-07-22 | 2014-12-17 | 易美芯光（北京）科技有限公司 | Constant-power feedback structure of segmented LED driving circuit |
| TWI766314B (en) * | 2020-07-21 | 2022-06-01 | 茂達電子股份有限公司 | Power converter with automatic balance mechanism of flying capacitor |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030227265A1 (en) * | 2002-06-10 | 2003-12-11 | Patent-Treuhand-Gesellschaft Fur Elektrisch Gluhlampen Mbh | Drive circuit for at least one LED strand |
| CN101106850A (en) * | 2006-07-12 | 2008-01-16 | 鸿富锦精密工业（深圳）有限公司 | LED drive circuit |
| CN101652004A (en) * | 2009-04-10 | 2010-02-17 | 成都芯源系统有限公司 | White light LED circuit and method for controlling average current of white light LED |
-
2011
- 2011-01-11 CN CN2011100046764A patent/CN102055324A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030227265A1 (en) * | 2002-06-10 | 2003-12-11 | Patent-Treuhand-Gesellschaft Fur Elektrisch Gluhlampen Mbh | Drive circuit for at least one LED strand |
| CN101106850A (en) * | 2006-07-12 | 2008-01-16 | 鸿富锦精密工业（深圳）有限公司 | LED drive circuit |
| CN101652004A (en) * | 2009-04-10 | 2010-02-17 | 成都芯源系统有限公司 | White light LED circuit and method for controlling average current of white light LED |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103987150A (en) * | 2013-02-08 | 2014-08-13 | 朗捷科技股份有限公司 | Anti-flicker double-loop LED drive circuit |
| CN104219832A (en) * | 2014-07-22 | 2014-12-17 | 易美芯光（北京）科技有限公司 | Constant-power feedback structure of segmented LED driving circuit |
| CN104219832B (en) * | 2014-07-22 | 2017-04-26 | 易美芯光（北京）科技有限公司 | Constant-power feedback structure of segmented LED driving circuit |
| TWI766314B (en) * | 2020-07-21 | 2022-06-01 | 茂達電子股份有限公司 | Power converter with automatic balance mechanism of flying capacitor |
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Application publication date: 20110511 |