CN101217256A - Power converter control method - Google Patents
Power converter control method Download PDFInfo
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- CN101217256A CN101217256A CNA2007100005147A CN200710000514A CN101217256A CN 101217256 A CN101217256 A CN 101217256A CN A2007100005147 A CNA2007100005147 A CN A2007100005147A CN 200710000514 A CN200710000514 A CN 200710000514A CN 101217256 A CN101217256 A CN 101217256A
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Abstract
A control method for a power converter is suitable for modulating a power signal output to the load from the power converter according to a feedback signal of the load. The method comprises the following steps: a reference signal is received to determine to output a modulating signal; the modulating signal is received and is corresponding to the working condition of a voltage transformation unit in the power converter so as to determine to output a power conducting signal; the power conducting signal is received so as to determine to output an oscillator signal of the voltage transformation unit in the power converter; when inputting the feedback signal, the duty period and frequency of the modulating signal is changed according to the feedback signal; the modulating signal is received after modulating the wave, duty period and frequency and the power motion time interval of the output power conducting signal is changed; the power conducting signal is received after changing the power motion time interval so as to determine to output the oscillator signal of the voltage transformation unit in the power converter.
Description
Technical field
The present invention relates to a kind of control method, especially relate to the control method of electric power converter.
Background technology
Module one backlight is to the key part and component that is the display screen driving light source, and module backlight is except providing light illumination, how the dimming function that changes module actual illumination effect backlight according to the backlight mode feedback signal most basic function in the practical application especially.
The high pressure inverter is adopted in the driving electric source of the module backlight that adopt the existing market more, and inverter is used to drive the oscillator signal of load according to the feedback signal adjustment of load, wherein, the adjustment mode of inverter is broadly divided into frequency modulation type and transfers the work period formula.Transferring work period formula inverter is to change the electric power variation of the width of oscillator signal with corresponding load according to feedback signal; And the frequency modulation type inverter belongs to high-order and complicated processing mode, its working method is: under the situation of steady job periodic width (common mode is that the work period is made as 50%), the situation that defines equivalent frequency adjustment table (Frequency Table) according to feedback signal utilization IC chip to be changing oscillator signal, thereby reaches and the identical effect of accent work period formula inverter.
Yet, under the real work situation of inverter, when driving load, inverter still need consider the operating frequency of other circuit elements, in order to avoid produce other circuit element frequencies and inverter or the load problem of mutual interference mutually, need to limit the frequency variation of inverter driving electric for this reason, cause interference to prevent that frequency variation is excessive, thereby make the relevant people in the industry of electric power be devoted to overcome this problem invariably.
Summary of the invention
Main purpose of the present invention is to provide a kind of control method of electric power converter, its utilization modulation circuit makes the frequency of electric power converter output power signal be unlikely because of changing excessive other electronic component runnings that influences with the work period and the frequency of time modulation oscillator signal.
For reaching above-mentioned purpose, according to the control method of electric power converter of the present invention, be applicable to the electric power signal that exports load according to the feedback signal modulation electric power converter of load to, comprising:
Receive reference signal with decision output modulating signal;
Receive the interior voltage transformation unit condition of work of this modulating signal and corresponding electric power converter with decision output power Continuity signal;
Receive this electric power Continuity signal with voltage transformation unit oscillator signal in this electric power converter of decision output;
When feedback signal is imported, change the work period and the frequency of modulating signal simultaneously according to this feedback signal;
Modulating signal after receiving this and changing work period and frequency simultaneously, distance when changing the electric power action of output power Continuity signal; And
Electric power Continuity signal when receiving this change electric power action after the distance is with voltage transformation unit oscillator signal in this electric power converter of decision output.
Thus, according to the control method of electric power converter of the present invention, it uses work period and the frequency of modulation circuit with the time modulation oscillator signal, thereby makes the frequency of electric power converter output power signal be unlikely because of changing excessive other electronic components runnings that influences.
Description of drawings
Fig. 1 is the circuit framework schematic diagram of a preferred embodiment of the present invention;
Fig. 2 is the load resonant curve synoptic diagram of a preferred embodiment of the present invention;
Fig. 3 is the preceding waveform schematic diagram of feedback of a preferred embodiment of the present invention;
Fig. 4 is waveform schematic diagram and the STRUCTURE DECOMPOSITION schematic diagram after the feedback of a preferred embodiment of the present invention;
Fig. 5 is the circuit framework schematic diagram of another preferred embodiment of the present invention; And
Fig. 6 is the waveform schematic diagram after the feedback of another preferred embodiment of the present invention.
Embodiment
Relevant detailed description of the present invention and technology contents, existing accompanying drawings is as follows:
Please refer to Fig. 1 to shown in Figure 4, be respectively the circuit framework schematic diagram, load resonant curve synoptic diagram of a preferred embodiment of the present invention, the waveform schematic diagram before the feedback, waveform schematic diagram and the STRUCTURE DECOMPOSITION schematic diagram after the feedback, as shown in the figure: the present invention is a kind of control method of electric power converter, be applicable to the electric power signal that exports load 1 according to the feedback signal modulation electric power converter of load 1 to, electric power converter is to be that embodiment describes with the inverter in the enforcement circuit of the present invention, and control method of the present invention and enforcement circuit comprise:
A. receive the reference signal (A) that produced by oscillator 4 signal generating circuit with decision output modulating signal (B), in the present embodiment, this signal generating circuit is resistance R 1 and capacitor C, and wherein resistance R 1 with the formula that discharges and recharges of capacitor C is
This oscillator 4 collocation resistance R 1 with the characteristics of signals that capacitor C is produced are, when the voltage of modulating signal (B) greater than (2/3) V
HIGHThe time then reference signal (A) by V
HIGHReduce to 0 volt, and when the voltage of modulating signal (B) less than (1/3) V
HIGHThe time then reference signal (A) be upgraded to V by 0 volt
HIGHWherein this oscillator 4 can be integrated into PWM controller (PWM) with resistance R 1, capacitor C, and load 1 is 51.2KHz at the resonance frequency F0 of present embodiment, for making explanation simpler, the equiva lent impedance frequency of oscillation that resistance R 1, resistance R 2, diode D and capacitor C are produced is considered as greater than 51.2KHz, and make its working region be positioned at the Y district of Fig. 2 load resonant curve, present load 1 operating frequency and be inversely proportional to the gain of load 1 driving electric, and signal work period (DUTY) D before feedback signal (G) input is 50%;
B. receive this modulating signal (B), and voltage transformation unit 6 conditions of work of corresponding electric power converter are with decision output power Continuity signal (C), (D) control unit, wherein, electric power Continuity signal (C), the property value of distance when (D) having the electric power action, distance when distance was ended with electric power when distance comprised the electric power conducting during this electric power action, in the present embodiment, this control unit is an oscillator 4, enforcement circuit of the present invention is to be that embodiment describes with the magnetic transformer, in Fig. 1, corresponding 50% modulating signal (B), then electric power Continuity signal (C), (D) also be 50%ON and 50%OFF;
C. receive this electric power Continuity signal (C), (D) export voltage transformation unit 6 oscillator signals (F) in this electric power converter with decision driver 5, in the present embodiment, this driver 5 is power transistors of two diverter switches, and to utilize the leakage inductance of voltage transformation unit 6 and the resonance of load 1 be the oscillator signal (F) of the wavy attitude of string with electric power signal (E) by the square wave state exchange, and then drive load 1;
D. when feedback signal (G) that this load 1 transmits via comparison amplifier 2, according to this feedback signal (G), under reference signal (A) benchmark, the utilization modulation circuit changes the waveform of modulating signal (B) simultaneously, work period and frequency, in the present embodiment, this modulation circuit is by the optical coupling unit 3 of obtaining feedback signal (G), the resistance R 2 of this optical coupling unit 3 of connecting constitutes with diode D, when feedback signal (G) was imported, then the circuit characteristic that discharges and recharges of capacitor C can cause the charge circuit impedance constant and the discharge loop impedance changes 1/[(1/R1+1/ (R2+R into by R1 originally
FB)], R wherein
FBIt is the equiva lent impedance of optical coupling unit 3, so make accelerate discharge time because of the discharge loop impedance increases, thereby make modulating signal (B) first o'clock apart from the Ton reduction and second o'clock constant apart from Toff, make the same time modulation of waveform, work period and frequency of modulating signal (B);
Distance when E. receiving this modulating signal (B) after with time modulation waveform, work period and frequency and changing the electric power action of output power Continuity signal (C), (D), wherein, during the electric power conducting apart from electric power by the time apart from be decided by respectively first o'clock of modulating signal (B) apart from Ton and second o'clock apart from Toff; And
Electric power Continuity signal (C) when F. receiving this change electric power action after the distance, (D) with voltage transformation unit 6 oscillator signals (F) in this electric power converter of decision output, wherein, during the positive half cycle of voltage transformation unit 6 oscillator signals (F) apart from negative half period the time apart from being decided by electric power Continuity signal (C), during (D) electric power conducting apart from electric power by the time distance, and during the electric power conducting apart from electric power by the time apart from being determined apart from Toff apart from Ton and second o'clock by first o'clock of modulating signal (B), so according to formula work period Duty=Ton/ (Ton+Toff) and frequency Frequency=1/ (Ton+Toff), then in modulation electric power when action, reach 58.79KHz apart from also reaching 42.8% with the work period of time modulation oscillator signal (F) with frequency, thereby reach the effect that reduces the gain of load 1 driving electric, and, by the frequency that work period and frequency with time modulation oscillator signal (F) make load 1 working signal, be unlikely because of changing excessive other electronic component runnings that influences.
Please refer to Fig. 5 and shown in Figure 6, is the circuit framework schematic diagram of another preferred embodiment of the present invention and the waveform schematic diagram after the feedback, refers again to Fig. 2 and Fig. 3 simultaneously, as shown in the figure:
Present embodiment is with the difference part of previous embodiment: modulation circuit is that the resistance R 2 by the optical coupling unit 3 of obtaining feedback signal (G) and this optical coupling unit 3 of connecting is constituted, and the feedback point of optical coupling unit 3 is to be electrically connected on capacitor C by resistance R 2, and the resonance frequency F0 of load 1 still is 51.2KHz, resistance R 1, resistance R 2 is considered as less than 51.2KHz with the equiva lent impedance frequency of oscillation that capacitor C is produced, thereby make its working region be positioned at the X district of Fig. 2 load resonant curve, present load 1 operating frequency and be proportional to the gain of load 1 driving electric, so when feedback signal (G) is imported, the work period of modulation oscillator signal (F) reaches 34.42% and reaches 45.3KHz with frequency, thereby reaches the effect that reduces the gain of load 1 driving electric equally.
Thus, the electric power converter that the working region is positioned at the X district of Fig. 2 load resonant curve drives the circuit of load and when presenting load 1 operating frequency and gaining proportional the relation with load 1 driving electric, also can be when feedback signal (G) be imported, presenting the circuit characteristic that discharges and recharges causes the charging interval to increase and reduction discharge time, thereby make modulating signal (B) first o'clock increase apart from Toff at second o'clock apart from the Ton reduction, make modulation electric power when action apart from also reaching the effect of minimizing load 1 driving electric gain with frequency with the work period of time modulation oscillator signal (F), and, make the frequency of load 1 working signal also be unlikely because of changing excessive other electronic component runnings that influences by work period and frequency with time modulation oscillator signal (F).
Be noted that, in above-mentioned two execution modes of the present invention, electric power converter is to be that embodiment describes with inverter (Inverter), but in fact also can be DC-DC power supply converter (DC/DC Converter), pressurizer (Voltage Regulator).
In sum, no matter be that the working region is positioned at the X district of Fig. 2 load resonant curve or Y district and presents gain any electric power converter of proportional relation or inverse relation of load 1 operating frequency and load 1 driving electric and drive the circuit of load, when feedback signal (G) is imported, all can make the work period of load 1 working signal (being the oscillator signal (F) of voltage transformation unit 6) and frequency be unlikely by modulation mode of the present invention and modulation circuit because of changing excessive other electronic component runnings that influences.
The above is the preferred embodiments of the present invention only, is not limited to the present invention.In the above-described embodiments, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (11)
1. the control method of an electric power converter is applicable to the electric power signal that exports load (1) according to feedback signal (G) the modulation electric power converter of load (1) to, it is characterized in that described control method comprises:
A. receive reference signal (A) with decision output modulating signal (B);
B. receive interior voltage transformation unit (6) condition of work of described modulating signal (B) and corresponding electric power converter with decision output power Continuity signal (C), (D);
C. receive described electric power Continuity signal (C), (D) with voltage transformation unit (6) oscillator signal (F) in the described electric power converter of decision output;
D. when feedback signal (G) is imported, change the work period and the frequency of modulating signal (B) simultaneously according to described feedback signal (G);
E. receive the described modulating signal (B) that changes simultaneously after work period and the frequency, distance when changing the electric power action of output power Continuity signal (C), (D); And
When F. receiving the action of described change electric power apart from after electric power Continuity signal (C), (D) with voltage transformation unit (6) oscillator signal (F) in the described electric power converter of decision output.
2. the control method of electric power converter according to claim 1, it is characterized in that: the electric power converter of making according to described control method is by voltage transformation unit (6) and provides the control circuit of voltage transformation unit (6) oscillator signal (F) to be constituted, receive input voltage by described voltage transformation unit (6) and drive rear end load (1) action with described oscillator signal (F) action power conversion, described control circuit comprises:
Receive the signal generating circuit of reference signal (A) with decision output modulating signal (B);
Receive the control unit of interior voltage transformation unit (6) condition of work of modulating signal (B) and corresponding electric power converter with decision output power Continuity signal (C), (D);
Receive electric power Continuity signal (C), (D) export voltage transformation unit (6) oscillator signal (F) in the described electric power converter with decision driver (5); And
Change the work period of modulating signal (B) and the modulation circuit of frequency simultaneously according to feedback signal (G).
3. the control method of electric power converter according to claim 2 is characterized in that: described signal generating circuit is to receive the resistance (R1) of reference signal (A) and the electric capacity (C) of connect described resistance (R1) and output modulating signal in parallel (B).
4. the control method of electric power converter according to claim 2, it is characterized in that: described control unit is oscillator (4).
5. the control method of electric power converter according to claim 2, it is characterized in that: described signal generating circuit and described control unit are integrated into PWM controller.
6. the control method of electric power converter according to claim 2 is characterized in that: described driver (5) is the power transistor of two diverter switches.
7. the control method of electric power converter according to claim 3, it is characterized in that: described D step is when feedback signal (G) is imported, and changes the work period and the frequency of modulating signal (B) when changing according to the electric capacity (C) of the signal generating circuit time that discharges and recharges.
8. according to the control method of each described electric power converter in the claim 2 to 7, it is characterized in that: described modulation circuit is made of the resistance (R2) of the optical coupling unit of obtaining feedback signal (G) (3), described optical coupling unit (3) of connecting and diode (D).
9. according to the control method of each described electric power converter in the claim 2 to 7, it is characterized in that: described modulation circuit is that the resistance (R2) by the optical coupling unit of obtaining feedback signal (G) (3) and described optical coupling unit (3) of connecting is constituted.
10. the control method of electric power converter according to claim 1 is characterized in that: when described D step is imported in feedback signal (G), except that the work period and frequency that change modulating signal (B), also adjust the waveform of modulating signal (B).
11. the control method of electric power converter according to claim 1 is characterized in that: described electric power converter is selected from one of the following: inverter, pressurizer and DC-DC power supply converter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100005147A CN101217256A (en) | 2007-01-05 | 2007-01-05 | Power converter control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100005147A CN101217256A (en) | 2007-01-05 | 2007-01-05 | Power converter control method |
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| Publication Number | Publication Date |
|---|---|
| CN101217256A true CN101217256A (en) | 2008-07-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007100005147A Pending CN101217256A (en) | 2007-01-05 | 2007-01-05 | Power converter control method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107066064A (en) * | 2015-09-10 | 2017-08-18 | Nec平台株式会社 | Supply unit, power control method and recording medium for supply unit |
-
2007
- 2007-01-05 CN CNA2007100005147A patent/CN101217256A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107066064A (en) * | 2015-09-10 | 2017-08-18 | Nec平台株式会社 | Supply unit, power control method and recording medium for supply unit |
| CN107066064B (en) * | 2015-09-10 | 2020-06-23 | Nec平台株式会社 | Power supply device, power supply control method for power supply device, and recording medium |
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