CN201134233Y - Current controlling circuit with phase locked and real power - Google Patents
Current controlling circuit with phase locked and real power Download PDFInfo
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- CN201134233Y CN201134233Y CNU2007201391544U CN200720139154U CN201134233Y CN 201134233 Y CN201134233 Y CN 201134233Y CN U2007201391544 U CNU2007201391544 U CN U2007201391544U CN 200720139154 U CN200720139154 U CN 200720139154U CN 201134233 Y CN201134233 Y CN 201134233Y
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- electronic switch
- phase
- signal
- square
- square wave
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Abstract
The utility model relates to a phase-locked real power current control circuit, which comprises a direct current source, an electronic switch, a driving transformer, a phase sense unit, a current intercepting unit and a square wave controller, wherein the direct current source switches direct current singles into square wave singles to supply the driving transformer to push load through the electronic switch, the electronic switch outputs the square wave singles to the phase sense unit at the same time, phase singles of square wave are sensed through the phase sense unit, and sense singles are output to the current intercepting unit. The sense singles and the current intercepting unit are compared with the current which is intercepted by the electronic switch, the driving transformer or the load, the comparative result is fed back to the square wave controller, further the actuation frequency of the electronic switch is controlled. Through the phase sense unit and the current intercepting unit, using the principle that the square wave and first harmonic have a same phase, the utility model intercepts the current according to the waveform of the square wave, further the square wave controller is controlled to steadily switch the electronic switch, thereby achieving the purpose of controlling and maintaining steady load.
Description
Technical field
The utility model relates to a kind of phase-locked real merit Current Control circuit, particularly a kind of operation circuit of keeping the lighting tube brightness of balance LCD backlight.
Background technology
See also Figure 1A, Figure 1B and Fig. 1 C, be existing load current back coupling control architecture figure, by among the figure as can be known, this direct supply 11 switches to square-wave signal by electronic switch 12 with direct current signal and promotes load 4 for driving transformer 13, and current signal by current sense unit 14 detecting electronic switch 12 (shown in Figure 1A), driving transformer 13 (shown in Figure 1B) or loads 4 (shown in Fig. 1 C), and this signal feedback to square wave controller 15, and then control electronic switch 12 make dynamic frequency.
Though above-mentioned control architecture can reach the purpose of back coupling control, but has following point:
1. because the electric current of the load of flowing through is I
R, I
L, I
CForm, and load if the change will make I
R, I
L, I
CChange synchronously, and then influence back coupling control cause problems such as control is difficult for.
2. above-mentioned control architecture when applying to the control of LCD backlight, often causes the uneven problem of light-source brightness.
Summary of the invention
The purpose of this utility model is to provide a kind of phase-locked real merit Current Control circuit, by phase detection unit and electric current interception unit, the principle that has same phase with square wave and first harmonic, so can intercept electric current according to the waveform of square wave, and then may command square wave controller comes stable switching electronic switch, reaches control and keeps the stable purpose of load.
Another purpose of the present utility model is to provide a kind of phase-locked real merit Current Control circuit, when applying to the control of LCD backlight, but with the active balance lamp tube current, reaches and keeps evenly shinny purpose of fluorescent tube.
Another purpose of the present utility model is to provide a kind of phase-locked real merit Current Control circuit, has the degree of stability that improves product and use, increases the service life and reduce advantages such as cost of products.
For achieving the above object, the utility model provides a kind of phase-locked real merit Current Control circuit, and it is made up of DC current source, electronic switch, driving transformer, phase detection unit, electric current interception unit and square wave controller; This direct supply switches to square-wave signal by electronic switch with direct current signal and promotes load for driving transformer, and this electronic switch can export square-wave signal to phase detection unit simultaneously, and the phase signal by phase detection unit detecting square wave, and export this detection signal to the electric current interception unit, this detection signal can be compared in electronic switch, driving transformer or electric current that load intercepted with the electric current interception unit, and comparative result feedback to the square wave controller, and then the control electronic switch make dynamic frequency.
Another program of the present invention provides a kind of phase-locked real merit Current Control circuit, comprises: a direct current power supply provides a direct current signal to electronic switch; One electronic switch receives the direct current signal of direct supply output, and it is switched to square-wave signal exports driving transformer and phase detection unit to; One driving transformer receives the square-wave signal of electronic switch output, and exports to load and use after the processing of boosting; One phase detection unit receives the square-wave signal of electronic switch output, and can detect the phase signal of square wave, and exports this detection signal to the electric current interception unit; One electric current interception unit, the detection signal that the receiving phase detecting unit is exported, and with compare in the electric current that driving transformer intercepted, and comparative result is feedback to the square wave controller; One square wave controller receives the comparative result of being exported by the electric current interception unit, and controls the dynamic frequency of doing of electronic switch according to this result.
Another scheme of the present invention provides a kind of phase-locked real merit Current Control circuit, comprises: a direct current power supply provides a direct current signal to electronic switch; One electronic switch receives the direct current signal of direct supply output, and it is switched to square-wave signal exports driving transformer and phase detection unit to; One driving transformer receives the square-wave signal of electronic switch output, and exports to load and use after the processing of boosting; One phase detection unit receives the square-wave signal of electronic switch output, and can detect the phase signal of square wave, and exports this detection signal to the electric current interception unit; One electric current interception unit, the detection signal that the receiving phase detecting unit is exported, and with compare in the electric current that load intercepted, and comparative result is feedback to the square wave controller; One square wave controller receives the comparative result of being exported by the electric current interception unit, and controls the dynamic frequency of doing of electronic switch according to this result.
The utility model makes it compared with prior art owing to adopted above-mentioned technical scheme, has following advantage and good effect:
1. phase-locked real merit Current Control circuit of the present utility model, by phase detection unit and electric current interception unit, the principle that has same phase with square wave and first harmonic, so can intercept electric current according to the waveform of square wave, and then may command square wave controller comes stable switching electronic switch, reaches control and keeps the stable purpose of load.
2. phase-locked real merit Current Control circuit of the present utility model when applying to the control of LCD backlight, but with the active balance lamp tube current, reaches and keeps evenly shinny purpose of fluorescent tube.
3. phase-locked real merit Current Control circuit of the present utility model has the degree of stability that improves product and use, increases the service life and reduces advantages such as cost of products.
Description of drawings
Figure 1A, Figure 1B, Fig. 1 C are existing load current back coupling control architecture figure;
Fig. 2 A is the equivalent circuit diagram (1) of load current back coupling control architecture;
Fig. 2 B is the equivalent circuit diagram (2) of load current back coupling control architecture;
Fig. 3 A is the voltage and the amperometry synoptic diagram of load current back coupling control architecture;
Fig. 3 B is that the voltage and the average current of load current back coupling control architecture analyzed synoptic diagram;
Fig. 3 C is that the square-wave voltage and the first harmonic of load current back coupling control architecture analyzed synoptic diagram;
Fig. 4 A is that first of the phase-locked real merit Current Control circuit of the utility model is implemented configuration diagram;
Fig. 4 B is that second of this phase-locked real merit Current Control circuit is implemented configuration diagram; And
Fig. 4 C is the 3rd an embodiment configuration diagram of this phase-locked real merit Current Control circuit.
Embodiment
Below with reference to accompanying drawing phase-locked real merit Current Control circuit of the present utility model is described in further detail.
See also Fig. 2 A, equivalent circuit diagram (1) for load current back coupling control architecture, by among the figure as can be known, this electronic switch 21 can produce square-wave signal 22, and this driving transformer 23 and load 24 will can be considered the combination of resistance (R), inductance (L), electric capacity (C).
See also Fig. 2 B, be that load current feedbacks the equivalent circuit diagram (2) of control architecture, by among the figure as can be known, this square-wave signal 22 is got the first harmonic signal of energy maximum through the Fu Li leaf analysis, is a string ripple signal 25.
See also Fig. 3 A, voltage and amperometry synoptic diagram for load current back coupling control architecture, by among the figure as can be known, this driving transformer and load will can be considered resistance (R), inductance (L), electric capacity (C) combination in parallel in above-mentioned Fig. 2 A, and bestow voltage (V) at two ends, and the electric current of the resistance of flowing through (R), inductance (L), electric capacity (C) is respectively I
R, I
L, I
C, with voltage (V) and I
R, I
L, I
CAfter the amperometry, can find voltage (V) and I
RThe phase place of electric current is identical.
See also Fig. 3 B, be that load current feedbacks the voltage and the average current of control architecture and analyze synoptic diagram, by among the figure as can be known, I
L (on average), I
C (on average)Be all 0, have only I
R (on average)Be real merit electric current.
See also Fig. 3 C, be that load current feedbacks the square-wave voltage and first harmonic analysis synoptic diagram of control architecture, by among the figure as can be known, with square-wave signal and first harmonic signal relatively after, can find that square-wave signal is identical with the phase place of first harmonic signal, so can intercept electric current according to the waveform of square-wave signal.
See also Fig. 4 A, be that first of the phase-locked real merit Current Control circuit of the utility model implemented configuration diagram, by among the figure as can be known, the phase-locked real merit Current Control circuit 3 of the utility model comprises:
One direct current power supply 31 provides a direct current signal to electronic switch 32;
One electronic switch 32 receives the direct current signal of direct supply 31 outputs, and it is switched to square-wave signal exports driving transformer 33 and phase detection unit 34 to;
One driving transformer 33 receives the square-wave signal of electronic switch 32 outputs, and exports to load 4 and use after the processing of boosting;
One phase detection unit 34 receives the square-wave signal of electronic switch 32 outputs, and can detect the phase signal of square wave, and exports this detection signal to electric current interception unit 35;
One electric current interception unit 35, the detection signal that receiving phase detecting unit 34 is exported, and compare with the electric current that is intercepted in electronic switch 32, and comparative result is feedback to square wave controller 36;
One square wave controller 36 receives the comparative result of being exported by electric current interception unit 35, and controls the dynamic frequency of doing of electronic switch 32 according to this result.
See also Fig. 4 B, be that second of the phase-locked real merit Current Control circuit of the utility model implemented configuration diagram, by among the figure as can be known, the phase-locked real merit Current Control circuit 3 of the utility model comprises:
One direct current power supply 31 provides a direct current signal to electronic switch 32;
One electronic switch 32 receives the direct current signal of direct supply 31 outputs, and it is switched to square-wave signal exports driving transformer 33 and phase detection unit 34 to;
One driving transformer 33 receives the square-wave signal of electronic switch 32 outputs, and exports to load 4 and use after the processing of boosting;
One phase detection unit 34 receives the square-wave signal of electronic switch 32 outputs, and can detect the phase signal of square wave, and exports this detection signal to electric current interception unit 35;
One electric current interception unit 35, the detection signal that receiving phase detecting unit 34 is exported, and compare with the electric current that is intercepted in driving transformer 33, and comparative result is feedback to square wave controller 36;
One square wave controller 36 receives the comparative result of being exported by electric current interception unit 35, and controls the dynamic frequency of doing of electronic switch 32 according to this result.
See also Fig. 4 C, be that the 3rd of the phase-locked real merit Current Control circuit of the utility model implements configuration diagram, by among the figure as can be known, the phase-locked real merit Current Control circuit 3 of the utility model comprises:
One direct current power supply 31 provides a direct current signal to electronic switch 32;
One electronic switch 32 receives the direct current signal of direct supply 31 outputs, and it is switched to square-wave signal exports driving transformer 33 and phase detection unit 34 to;
One driving transformer 33 receives the square-wave signal of electronic switch 32 outputs, and exports to load 4 and use after the processing of boosting;
One phase detection unit 34 receives the square-wave signal of electronic switch 32 outputs, and can detect the phase signal of square wave, and exports this detection signal to electric current interception unit 35;
One electric current interception unit 35, the detection signal that receiving phase detecting unit 34 is exported, and compare with the electric current that is intercepted in load 4, and comparative result is feedback to square wave controller 36;
One square wave controller 36 receives the comparative result of being exported by electric current interception unit 35, and controls the dynamic frequency of doing of electronic switch 32 according to this result.
Phase-locked real merit Current Control circuit provided by the utility model when comparing mutually with other prior art, has more following advantage:
1. phase-locked real merit Current Control circuit of the present utility model, by phase detection unit and electric current interception unit, the principle that has same phase with square wave and first harmonic, so can intercept electric current according to the waveform of square wave, and then may command square wave controller comes stable switching electronic switch, reaches control and keeps the stable purpose of load.
2. phase-locked real merit Current Control circuit of the present utility model when applying to the control of LCD backlight, but with the active balance lamp tube current, reaches and keeps evenly shinny purpose of fluorescent tube.
3. phase-locked real merit Current Control circuit of the present utility model has the degree of stability that improves product and use, increases the service life and reduces advantages such as cost of products.
That more than introduces only is based on preferred embodiment of the present utility model, can not limit scope of the present utility model with this.Any the utility model is done replacement, the combination, discrete of step well know in the art, and the utility model implementation step is done well know in the art being equal to change or replace and all do not exceed exposure of the present utility model and protection domain.
Claims (3)
1. a phase-locked real merit Current Control circuit is characterized in that, comprises:
One direct current power supply provides a direct current signal to electronic switch;
One electronic switch receives the direct current signal of direct supply output, and it is switched to square-wave signal exports driving transformer and phase detection unit to;
One driving transformer receives the square-wave signal of electronic switch output, and exports to load and use after the processing of boosting;
One phase detection unit receives the square-wave signal of electronic switch output, and can detect the phase signal of square wave, and exports this detection signal to the electric current interception unit;
One electric current interception unit, the detection signal that the receiving phase detecting unit is exported, and with compare in the electric current that electronic switch intercepted, and comparative result is feedback to the square wave controller;
One square wave controller receives the comparative result of being exported by the electric current interception unit, and controls the dynamic frequency of doing of electronic switch according to this result.
2. a phase-locked real merit Current Control circuit is characterized in that, comprises:
One direct current power supply provides a direct current signal to electronic switch;
One electronic switch receives the direct current signal of direct supply output, and it is switched to square-wave signal exports driving transformer and phase detection unit to;
One driving transformer receives the square-wave signal of electronic switch output, and exports to load and use after the processing of boosting;
One phase detection unit receives the square-wave signal of electronic switch output, and can detect the phase signal of square wave, and exports this detection signal to the electric current interception unit;
One electric current interception unit, the detection signal that the receiving phase detecting unit is exported, and with compare in the electric current that driving transformer intercepted, and comparative result is feedback to the square wave controller;
One square wave controller receives the comparative result of being exported by the electric current interception unit, and controls the dynamic frequency of doing of electronic switch according to this result.
3. a phase-locked real merit Current Control circuit is characterized in that, comprises:
One direct current power supply provides a direct current signal to electronic switch;
One electronic switch receives the direct current signal of direct supply output, and it is switched to square-wave signal exports driving transformer and phase detection unit to;
One driving transformer receives the square-wave signal of electronic switch output, and exports to load and use after the processing of boosting;
One phase detection unit receives the square-wave signal of electronic switch output, and can detect the phase signal of square wave, and exports this detection signal to the electric current interception unit;
One electric current interception unit, the detection signal that the receiving phase detecting unit is exported, and with compare in the electric current that load intercepted, and comparative result is feedback to the square wave controller;
One square wave controller receives the comparative result of being exported by the electric current interception unit, and controls the dynamic frequency of doing of electronic switch according to this result.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201391544U CN201134233Y (en) | 2007-08-31 | 2007-08-31 | Current controlling circuit with phase locked and real power |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201391544U CN201134233Y (en) | 2007-08-31 | 2007-08-31 | Current controlling circuit with phase locked and real power |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201134233Y true CN201134233Y (en) | 2008-10-15 |
Family
ID=40062500
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007201391544U Expired - Fee Related CN201134233Y (en) | 2007-08-31 | 2007-08-31 | Current controlling circuit with phase locked and real power |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201134233Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104797057A (en) * | 2015-04-29 | 2015-07-22 | 宁波摩米创新工场电子科技有限公司 | LED (light emitting diode) energy-saving driving system based on phase-locked loop circuit |
| CN105528998A (en) * | 2014-09-28 | 2016-04-27 | 联想(北京)有限公司 | Background light driving module and electronic device |
-
2007
- 2007-08-31 CN CNU2007201391544U patent/CN201134233Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105528998A (en) * | 2014-09-28 | 2016-04-27 | 联想(北京)有限公司 | Background light driving module and electronic device |
| CN105528998B (en) * | 2014-09-28 | 2019-07-26 | 联想(北京)有限公司 | Bias light drive module and electronic equipment |
| CN104797057A (en) * | 2015-04-29 | 2015-07-22 | 宁波摩米创新工场电子科技有限公司 | LED (light emitting diode) energy-saving driving system based on phase-locked loop circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20081015 Termination date: 20110831 |