CN103219016A - Compact disk player circuit - Google Patents
Compact disk player circuit Download PDFInfo
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- CN103219016A CN103219016A CN2013101321397A CN201310132139A CN103219016A CN 103219016 A CN103219016 A CN 103219016A CN 2013101321397 A CN2013101321397 A CN 2013101321397A CN 201310132139 A CN201310132139 A CN 201310132139A CN 103219016 A CN103219016 A CN 103219016A
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- triode
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Abstract
The invention discloses a compact disk player circuit which comprises a laser, a controlling chip, a laser driving unit, a first resistor, a third resistor, a fourth resistor, a sixth resistor, a first triode, a second triode, a diode and a capacitor. A current size controlling signal output end and a controlling port of the controlling chip are respectively connected with a current size controlling signal input end of the laser driving unit and an enable terminal of the laser, a base of the first triode is connected with a second power supply through the first resistor, a emitter of the first triode is connected with the ground, a collector of the first triode is connected with the ground through the fourth resistor, a positive pole of the diode is connected with a first power supply, a negative pole of the diode is connected with a collector of the first triode through the third resistor, a negative pole of the diode is connected with the ground through the capacitor, the collector of the first triode is connected with the base of the second triode through the sixth resistor, and the collector of the second triode and the emitter of the second triode are respectively connected with the enable terminal of the laser driving unit and the ground.
Description
Technical field
The present invention relates to the optical disc player field, be specifically related to the optical disc player circuit.
Background technology
In the servo-drive system of existing optical disc player, a Laser Drive unit is arranged on the movement head assemblies, it is luminous that this Laser Drive unit is used for control and drive laser, and there is a laser instrument Enable Pin Laser Drive unit.When the laser instrument Enable Pin was high level, Laser Drive unit output current was given laser instrument, and then laser instrument is luminous; When the laser instrument Enable Pin was low level, laser instrument was given in Laser Drive unit not output current, and laser instrument then can not be luminous.When the unexpected power down of optical disc player, the laser instrument damage occurs or become bad phenomenon through regular meeting.
Summary of the invention
Through discovering, when system's power down, control chip size of current control signal output ends, control port are not subjected under the situation of main nuclear chip controls, the Laser Drive unit also is in the state of effective operating voltage power supply if control port is still exported high level, the size of current control signal output ends might be exported the numerical value of the big current signal of representative, and then cause the Laser Drive unit to export big electric current to laser instrument, probably make this laser instrument damage or become bad.
In order to overcome the deficiencies in the prior art, the invention provides a kind of optical disc player circuit.
A kind of optical disc player circuit, comprise laser instrument, control chip and Laser Drive unit, described Laser Drive unit is used to drive described laser instrument, also comprise first resistance, the 3rd resistance, the 4th resistance, the 6th resistance, first triode, second triode, diode and electric capacity, the size of current control signal output ends of described control chip is connected with the laser instrument Enable Pin with the size of current signal input end of described Laser Drive unit respectively with control port, described first triode and second triode are the NPN triodes, the base stage of described first triode is connected with second source by described first resistance, the emitter grounding of described first triode, the collector of described first triode is by the 4th resistance eutral grounding, the anode of described diode is connected with first power supply, the negative electrode of described diode is connected with the collector of first triode by the 3rd resistance, the negative electrode of described diode is connected with ground by electric capacity, the collector of described first triode is connected with the base stage of second triode by the 6th resistance, and the collector of second triode is connected with ground with the laser instrument Enable Pin of Laser Drive unit respectively with emitter-base bandgap grading; When the power down of optical disc player circuit, described second source is faster than the speed of first power supply power-fail.
Also comprise the 5th resistance, first end of described the 5th resistance is connected with the negative electrode of diode, and second end of described the 5th resistance is connected with the 3rd resistance respectively at electric capacity.
Also comprise second resistance, the base stage of described first triode is by second resistance eutral grounding.
Be serially connected with resistance between described control port and the laser instrument Enable Pin.
Described diode is a schottky diode.
When power down, this optical disc player circuit can in time be pulled to low level with the laser-enabled end, thereby the Laser Drive unit is quit work, even be not subjected to the size of current control signal output ends output of main nuclear chip controls to represent the current signal of bigger numerical, the Laser Drive unit also can't be exported big electric current and damage laser instrument.
Description of drawings
Fig. 1 is the circuit theory diagrams of an embodiment of the present invention.
Embodiment
Below with reference to accompanying drawing, specific embodiments of the invention are described in further detail.
As shown in Figure 1, the optical disc player circuit of a kind of embodiment, comprise laser instrument, control chip and Laser Drive unit, described Laser Drive unit is used to drive described laser instrument, have size of current control signal output ends and control port on the control chip, have size of current signal input end and laser instrument Enable Pin on the Laser Drive unit, the size of current control signal output ends of control chip is connected with the laser instrument Enable Pin with the size of current signal input end of Laser Drive unit respectively with control port.
When control port output high level, after high level appears in the laser instrument Enable Pin, then start working in the Laser Drive unit, control chip is through after decoding, can export the current signal controlling value of corresponding size to the size of current signal input end in the size of current control signal output ends, the electric current that corresponding size is exported according to this current signal controlling value in the Laser Drive unit makes laser instrument luminous to laser instrument.
Control chip is made of main nuclear chip and peripheral circuit, the operating voltage of main usually nuclear chip and the operating voltage of peripheral circuit are inequality, and the operating voltage of Laser Drive unit is also inequality with the operating voltage of control chip, for example as a rule, the operating voltage lower (as 1.2V) of the main nuclear chip of control chip, the operating voltage of its peripheral circuit higher (as 3.3V), and the operating voltage of Laser Drive unit the highest (as 5V or 8V).
The optical disc player circuit also comprises first resistance R 1, second resistance R 2, the 3rd resistance R 3, the 4th resistance R 4, the 5th resistance R 5, the 6th resistance R 6, the first triode Q1, the second triode Q2, diode D and capacitor C, the first triode Q1 and the second triode Q2 are the NPN triodes, the base stage of the first triode Q1 is connected with second source VDD2 by first resistance R 1, simultaneously by second resistance R, 2 ground connection, the emitter grounding of the first triode Q1, the collector of the first triode Q1 is by the 4th resistance R 4 ground connection, the anode of diode D is connected with the first power vd D1, the negative electrode of diode D is connected with first end of the 5th resistance R 5, second end of the 5th resistance R 5 is connected with the collector of the first triode Q1 by the 3rd resistance R 3, second end of the 5th resistance R 5 is by capacitor C ground connection, and the collector of the second triode Q2 is connected with ground with the laser instrument Enable Pin of Laser Drive unit respectively with emitter-base bandgap grading.
During power down, the power down speed of the power down velocity ratio first power vd D1 of second source VDD2 is fast, can select for use power down is the fastest in the system power supply as second source VDD2, and the slowest power supply of power down is as the first power vd D1.
When the optical disc player circuit all has power supply to supply with, second source VDD2 makes the triode Q1 conducting of winning, thereby the current potential of the collector of the first triode Q1 is pulled to low level, thereby makes the second triode Q2 end, at this moment the controlled chip controls of laser instrument Enable Pin.
When the optical disc player circuit begins power down, because the power down speed of second source VDD2 is very fast, so the first triode Q1 ends soon, after Q1 ends, the first power vd D1 just begins power down, at this moment capacitor C begins discharge, and a discharge path is: through the 3rd resistance R 3, the 6th resistance R 6 and the second triode Q2, another discharge path is: through the 3rd resistance R 3 and the 4th resistance R 4.By adjusting capacitor C, the 3rd resistance R 3, the parameter of the 6th resistance R 6 made in longer a period of time, the base stage of the second triode Q2 all maintains high level, thereby the second triode Q2 conducting, the collector of the second triode Q2 is pulled to low level, thereby the laser instrument Enable Pin remains on low level state, and the Laser Drive unit quits work.
Simultaneously, the power supply of control chip and Laser Drive unit also begins power down, when the supply voltage of the main nuclear chip of control chip falls to its operating voltage when following, even the level signal of the control port of the peripheral circuit of control chip and size of current control signal output ends is not subjected to main nuclear chip controls, and high level or low level appear at random, if this moment, the supply voltage of Laser Drive unit also was on the effective voltage, in the time of promptly still can operate as normal, if and control port is exported high level, the signal of size of current control signal output ends output may be exported the current signal of represent bigger numerical and control numerical value so, thereby the Laser Drive unit can be exported big electric current and laser instrument is burnt or damages.
And the laser instrument Enable Pin has been pulled to low level owing to the second triode Q2 after the power down, so can't work in the Laser Drive unit, effectively protected laser instrument.
If there is not diode D, the electric weight of capacitor C also can discharge to the first power vd D1 place simultaneously during power down, thereby the time that makes the second triode Q2 continue conducting shortens.Wherein diode D can adopt schottky diode, can reduce the pressure drop of diode D like this.
VDD1 is by diode D when work, and the 5th resistance R 5 is to the capacitor C charging, thus the charging rate of adjustment capacitor C; Can certainly save the 5th resistance R 5.By adjusting the parameter of second resistance R, 2, the first resistance R 1, the first triode Q1 is ended faster.Be serially connected with resistance R between control port and the laser-enabled end to play the effect of isolation.
Claims (5)
1. optical disc player circuit, comprise laser instrument, control chip and Laser Drive unit, described Laser Drive unit is used to drive described laser instrument, it is characterized in that: also comprise first resistance, the 3rd resistance, the 4th resistance, the 6th resistance, first triode, second triode, diode and electric capacity, the size of current control signal output ends of described control chip is connected with the laser instrument Enable Pin with the size of current signal input end of described Laser Drive unit respectively with control port, described first triode and second triode are the NPN triodes, the base stage of described first triode is connected with second source by described first resistance, the emitter grounding of described first triode, the collector of described first triode is by the 4th resistance eutral grounding, the anode of described diode is connected with first power supply, the negative electrode of described diode is connected with the collector of first triode by the 3rd resistance, the negative electrode of described diode is connected with ground by electric capacity, the collector of described first triode is connected with the base stage of second triode by the 6th resistance, and the collector of second triode is connected with ground with the laser instrument Enable Pin of Laser Drive unit respectively with emitter-base bandgap grading; When the power down of optical disc player circuit, described second source is faster than the speed of first power supply power-fail.
2. optical disc player circuit as claimed in claim 1 is characterized in that: also comprise the 5th resistance, first end of described the 5th resistance is connected with the negative electrode of diode, and second end of described the 5th resistance is connected with the 3rd resistance respectively at electric capacity.
3. optical disc player circuit as claimed in claim 1 or 2 is characterized in that: also comprise second resistance, the base stage of described first triode is by second resistance eutral grounding.
4. optical disc player circuit as claimed in claim 1 or 2 is characterized in that: be serially connected with resistance between described control port and the laser instrument Enable Pin.
5. optical disc player circuit as claimed in claim 1 or 2 is characterized in that: described diode is a schottky diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310132139.7A CN103219016B (en) | 2013-04-16 | 2013-04-16 | A kind of Compact disk player circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310132139.7A CN103219016B (en) | 2013-04-16 | 2013-04-16 | A kind of Compact disk player circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103219016A true CN103219016A (en) | 2013-07-24 |
| CN103219016B CN103219016B (en) | 2015-08-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310132139.7A Active CN103219016B (en) | 2013-04-16 | 2013-04-16 | A kind of Compact disk player circuit |
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| Country | Link |
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| CN (1) | CN103219016B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1564583A (en) * | 2004-03-15 | 2005-01-12 | 四川长虹电器股份有限公司 | Protection circuit of TV |
| CN201039106Y (en) * | 2007-04-03 | 2008-03-19 | 青岛海信电器股份有限公司 | Shutdown silence circuit |
| TW200849697A (en) * | 2007-06-01 | 2008-12-16 | Hon Hai Prec Ind Co Ltd | Protection circuit for battery charge |
| CN201369777Y (en) * | 2009-01-20 | 2009-12-23 | 福建捷联电子有限公司 | On-off noise elimination circuit of LCD (liquid crystal display) TV |
| CN202455057U (en) * | 2012-02-01 | 2012-09-26 | 深圳市同洲电子股份有限公司 | Power supply protecting circuit |
-
2013
- 2013-04-16 CN CN201310132139.7A patent/CN103219016B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1564583A (en) * | 2004-03-15 | 2005-01-12 | 四川长虹电器股份有限公司 | Protection circuit of TV |
| CN201039106Y (en) * | 2007-04-03 | 2008-03-19 | 青岛海信电器股份有限公司 | Shutdown silence circuit |
| TW200849697A (en) * | 2007-06-01 | 2008-12-16 | Hon Hai Prec Ind Co Ltd | Protection circuit for battery charge |
| CN201369777Y (en) * | 2009-01-20 | 2009-12-23 | 福建捷联电子有限公司 | On-off noise elimination circuit of LCD (liquid crystal display) TV |
| CN202455057U (en) * | 2012-02-01 | 2012-09-26 | 深圳市同洲电子股份有限公司 | Power supply protecting circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103219016B (en) | 2015-08-19 |
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Address after: Changan town in Guangdong province Dongguan 523860 usha Beach Road No. 18 Patentee after: GUANGDONG OPPO MOBILE TELECOMMUNICATIONS Corp.,Ltd. Address before: Changan town in Guangdong province Dongguan 523860 usha Beach Road No. 18 Patentee before: GUANGDONG OPPO MOBILE TELECOMMUNICATIONS Corp.,Ltd. |