CN201035985Y - Power control circuit - Google Patents
Power control circuit Download PDFInfo
- Publication number
- CN201035985Y CN201035985Y CNU2007201190780U CN200720119078U CN201035985Y CN 201035985 Y CN201035985 Y CN 201035985Y CN U2007201190780 U CNU2007201190780 U CN U2007201190780U CN 200720119078 U CN200720119078 U CN 200720119078U CN 201035985 Y CN201035985 Y CN 201035985Y
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- CN
- China
- Prior art keywords
- signal
- resistance
- laser diode
- output terminal
- potential drop
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Abstract
The utility model relates to a power controlling circuit, which comprises a laser diode module, a photoelectric diode as well as a first resistor, wherein the input terminal of the photoelectric diode receives optical signals transmitted by the laser diode module, to further convert the received optical signals to be electrical signals, the input terminal of the first resistor is connected with the output terminal of the photoelectric diode, the output terminal of the first resistor is connected with a voltage dividing compensation circuit, which is connected with a signal input terminal, the signals input by the signal output terminal correspond to the optical signals transmitted by the laser diode module. A signal output terminal is arranged between the output terminal of the first resistor and the voltage dividing compensation circuit. Because the voltage dividing compensation circuit with the signal input terminal is arranged, the voltage dividing compensation circuit consists of a resistance element, the electric circuit stability is high, the electric circuit is not easy to be damaged, the cost is low, and the electric circuit has higher competitive market advantage.
Description
Technical field
The utility model relates to a kind of control circuit, relates in particular to a kind of power control circuit.
Background technology
At present, the electronic product of abstract the recreational consumption is quite universal.And along with the develop rapidly of science and technology, the function of these electronic products constantly increases, and performance improves constantly, and volume is constantly reducing.Wherein, the size of consumption electronic products volume depends on the size of its internal circuit scale to a great extent, and the quantity and the volume of the circuit component that the size of circuit scale depends on is thereon settled.
Some relate to the electronic product of optical information class, as DVD (Digital video disc) player because when reading CD data and DVD data respectively, employing be different laser diodes, so the operating characteristic of laser diode exists difference.The difference of this operating characteristic can influence the serviceability of DVD player, thus need adjust the laser diode emissive power, to eliminate the influence that two kinds of laser diode characteristics differences are brought.Existingly address the above problem the power control circuit that adopted as shown in Figure 1, the optical signals photodiode PD that laser diode LD is launched receives, and converts thereof into electric signal V
Pd, V
PdThrough resistance R
0With R
Cd, or R
0With R
DvdDividing potential drop after obtain MD, via comparator C 1 comparative result is fed back to laser diode LD again.R
CdAnd R
DvdThe other end be connected with metal-oxide-semiconductor Q respectively
2And Q
4, Q
2And Q
4Other end ground connection respectively.When reading the CD data, Q
2Conducting, Q
4End; When reading the DVD data, Q
4Conducting, Q
2End.Like this, MD can be remained on about 0.2V, and then the power of laser diode LD is remained in the normal range.Since when reading CD data and DVD data, V
PdInequality, thus to keep MD about 0.2V, then can be with R
CdValue be set to 1-2 kilohm, and R
DvdValue be set to 2-4 kilohm.
This circuit has adopted 2 metal-oxide-semiconductors, and the emissive power of laser tube CD-LD and DVD-LD because the cost of metal-oxide-semiconductor is higher, causes the cost up of whole DVD player when reading CD data and DVD data to adjust respectively; In addition, metal-oxide-semiconductor stability is not high, damages easily, thereby can influence the performance of entire machine.
The utility model content
Technical problem to be solved in the utility model is to provide a kind of power control circuit, and this circuit stability height is not fragile, and cost is low.
For solving the problems of the technologies described above, the technical scheme that the utility model adopted is: a kind of power control circuit is provided, comprise a laser diode module, a photodiode, the input end of this photodiode receives the light signal of being launched by this laser diode module, and then convert the light signal of its reception to electric signal, one first resistance, the input end of this first resistance is connected with this photodiode output, the output terminal of described first resistance is connected with a dividing potential drop compensating circuit, described dividing potential drop compensating circuit is connected with a signal input part, the signal that described signal input part is imported is corresponding with the light signal that described laser diode module is launched, between the output terminal of described first resistance and the described dividing potential drop compensating circuit signal output part is set, described by electric signal that photodiode produced under the control of described signal input part and after the dividing potential drop of the described dividing potential drop compensating circuit and first resistance, obtain an output signal in described signal output part, this output signal after the comparison via a comparer that is connected in described signal output part, is fed to described laser diode module again.
Described dividing potential drop compensating circuit comprises one second resistance, one end of described second resistance is connected with the output terminal of described first resistance, the other end is connected with the 3rd resistance and the 4th resistance respectively, the other end of described the 3rd resistance connects described signal input part, the other end ground connection of described the 4th resistance.
When the light signal of launching when described laser diode was more weak, the signal that described signal input part is imported was a low level, and when the light signal of launching when described laser diode module was strong, the signal that described signal input part is imported was a high level.
Described laser diode module comprises first laser diode and second laser diode, and the emissive power of this first laser diode and second laser diode is inequality.
Further improvement in the technical proposal is: a dividing potential drop compensating circuit with signal input part is set.
The beneficial effects of the utility model are: because power control circuit of the present utility model is owing to be provided with a dividing potential drop compensating circuit with signal input part, this dividing potential drop compensating circuit is made up of resistive element, therefore, the circuit stability height, not fragile, and cost is low, has higher market competition advantage.
Description of drawings
Fig. 1 is the electrical block diagram of existing a kind of power control circuit;
Fig. 2 is the electrical block diagram of a kind of embodiment of a kind of power control circuit of the utility model.
Embodiment
A kind of laser class device that is applicable to of the utility model is as DVD player etc.
Please refer to shown in Figure 2ly, it is the electrical block diagram of a kind of embodiment of the utility model power control circuit.The utility model power control circuit comprises laser diode module LD, receives the photodiode PD of the light signal of being launched by laser diode module LD, first resistance R that is connected with photodiode PD
0, first resistance R
0The other end be connected with a dividing potential drop compensating circuit, this dividing potential drop compensating circuit has a signal input part CD_DVDCT, and comprises and first resistance R
0Second resistance R that is connected
Cd, second resistance R
CdThe other end be connected with the 3rd resistance R respectively
1And the 4th resistance R
2The 3rd resistance R
1The other end be used to receive an input signal CD_DVDCT, this input signal CD_DVDCT can be provided by the decoding chip as DVD player.The 4th resistance R
2Other end ground connection.This laser diode module LD comprises the laser diode CD-LD of an emission CD signal and the laser diode DVD-LD of an emission DVD signal.Photodiode PD is used for converting the light signal of its reception to electric signal V
PdFirst resistance R
0With second resistance R
CdBetween be provided with an output terminal MD.This output terminal MD is connected with a comparator C 2,, is fed to laser diode module LD after the comparison of comparator C 2 by the signal of output terminal MD output.
Generally, when the voltage of output terminal MD is about 0.2V, can guarantee the operate as normal of laser diode module LD.Wherein, when laser diode CD-LD emission CD signal, the voltage of signal input end CD_DVDCT is 0V.According to the output situation of comparator C 2, carry out the adjustment of resistance.Under a kind of embodiment, can be with second resistance R
CdBe set to 1～2 kilohm, the 4th resistance R
2Resistance be set to 0.1 kilohm, like this, the voltage of output terminal MD is about through first resistance R
0And second resistance R
CdResulting voltage is about 0.2V after the dividing potential drop, its in normal range of operation, so, need not carry out dividing potential drop compensation.At this moment, its power influences to emission CD signal is little.
When laser diode DVD-LD emission DVD signal, the voltage of signal input end CD_DVDCT is 3.3V, and at this moment, the magnitude of voltage of output terminal MD should be:
V
MD＝I
dvd*R
cd+VR_CD＝0.2V
So,,, carry out the adjustment of resistance according to the output situation of comparator C 2 for satisfying following formula.Under a kind of embodiment, with the 3rd resistance R
1Be set to 2～4 kilohms.Because the 3rd resistance R
1And the 4th resistance R
2The dividing potential drop effect, make the voltage of VR_CD be promoted to about 0.1V, in addition, V during normal power
PdAt R
CdOn pressure drop between 0.05V to 0.15V, therefore, output terminal MD powers on and is pressed between the 0.15V to 0.25V.So when reading the DVD data, power can fluctuate 25%, again because the photodiode signal emissive power allows to fluctuate 30%, so little to the influence of DVD light signal emissive power.When producing laser head, by regulating R
CdResistance, make when reading CD and DVD signal, MD is remained on about 0.2V.Therefore, laser diode LD is when emission CD and DVD signal, and its power all can be controlled in the normal range.
Be appreciated that the utility model power control circuit can be arranged at the laser head outside, also can be integrated in laser head inside, with further raising circuit level.In addition, input signal CD_DVDCT can be by the decoding chip output as DVD player, and it is the anti-level of CD_DVD signal, if this decoding chip only provides the CD_DVD signal, then can be earlier with the CD_DVD signal inversion, and input again.As realizing by triode of arrangement.This input signal also can be provided by other source, as long as the voltage when voltage ratio when reading the DVD signal reads the CD signal greatly, correspondingly, suitably adjusts the resistance of the 3rd resistance R 1.
Claims (4)
1. power control circuit, comprise a laser diode module, a photodiode, the input end of this photodiode receives the light signal of being launched by this laser diode module, and then convert the light signal of its reception to electric signal, one first resistance, the input end of this first resistance is connected with this photodiode output, it is characterized in that: the output terminal of described first resistance is connected with a dividing potential drop compensating circuit, described dividing potential drop compensating circuit is connected with a signal input part, the signal that described signal input part is imported is corresponding with the light signal that described laser diode module is launched, between the output terminal of described first resistance and the described dividing potential drop compensating circuit signal output part is set, described by electric signal that photodiode produced under the control of described signal input part and after the dividing potential drop of the described dividing potential drop compensating circuit and first resistance, obtain an output signal in described signal output part, this output signal after the comparison via a comparer that is connected in described signal output part, is fed to described laser diode module again.
2. power control circuit as claimed in claim 1, it is characterized in that: described dividing potential drop compensating circuit comprises one second resistance, one end of described second resistance is connected with the output terminal of described first resistance, the other end is connected with the 3rd resistance and the 4th resistance respectively, the other end of described the 3rd resistance connects described signal input part, the other end ground connection of described the 4th resistance.
3. power control circuit as claimed in claim 1, it is characterized in that: when the light signal of launching when described laser diode is more weak, the signal that described signal input part is imported is a low level, when the light signal of launching when described laser diode was strong, the signal that described signal input part is imported was a high level.
4. power control circuit as claimed in claim 1 is characterized in that: described laser diode module comprises first laser diode and second laser diode, and the emissive power of this first laser diode and second laser diode is inequality.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201190780U CN201035985Y (en) | 2007-03-21 | 2007-03-21 | Power control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201190780U CN201035985Y (en) | 2007-03-21 | 2007-03-21 | Power control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201035985Y true CN201035985Y (en) | 2008-03-12 |
Family
ID=39196874
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007201190780U Expired - Fee Related CN201035985Y (en) | 2007-03-21 | 2007-03-21 | Power control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201035985Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101930767B (en) * | 2009-06-19 | 2012-09-05 | 鸿富锦精密工业（深圳）有限公司 | Electronic equipment with optical module |
-
2007
- 2007-03-21 CN CNU2007201190780U patent/CN201035985Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101930767B (en) * | 2009-06-19 | 2012-09-05 | 鸿富锦精密工业（深圳）有限公司 | Electronic equipment with optical module |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| DD01 | Delivery of document by public notice |
Addressee: Wang Yanling Document name: Notification to Pay the Fees |
|
| DD01 | Delivery of document by public notice |
Addressee: Wang Yanling Document name: Notification of Termination of Patent Right |
|
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080312 Termination date: 20100321 |