CN103219016B - A kind of Compact disk player circuit - Google Patents
A kind of Compact disk player circuit Download PDFInfo
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- CN103219016B CN103219016B CN201310132139.7A CN201310132139A CN103219016B CN 103219016 B CN103219016 B CN 103219016B CN 201310132139 A CN201310132139 A CN 201310132139A CN 103219016 B CN103219016 B CN 103219016B
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- resistance
- triode
- diode
- drive unit
- laser instrument
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Abstract
The invention discloses a kind of Compact disk player circuit, comprise laser instrument, control chip, laser drive unit, first resistance, 3rd resistance, 4th resistance, 6th resistance, first triode, second triode, diode and electric capacity, the size of current control signal output terminal of control chip and control port are connected with the size of current control signal input end of laser drive unit and laser instrument Enable Pin respectively, the base stage of the first triode is connected with second source by the first resistance, the emitter grounding of the first triode, the collector of the first triode is by the 4th resistance eutral grounding, the anode of diode is connected with the first power supply, the negative electrode of diode is connected with the collector of the first triode by the 3rd resistance, the negative electrode of diode is connected to ground by electric capacity, the collector of the first triode is connected with the base stage of the second triode by the 6th resistance, the collector of the second triode is connected with ground with the laser instrument Enable Pin of laser drive unit respectively with emitter-base bandgap grading.
Description
Technical field
The present invention relates to optical disc player field, be specifically related to Compact disk player circuit.
Background technology
In the servo-drive system of existing optical disc player, loader optical head assembly has a laser drive unit, this laser drive unit is used for controlling and drive laser luminescence, and laser drive unit has a laser instrument Enable Pin.When laser instrument Enable Pin is high level, laser drive unit output current is to laser instrument, then laser instrument is luminous; When laser instrument Enable Pin is low level, output current is not to laser instrument for laser drive unit, and laser instrument then can not be luminous.When the unexpected power down of optical disc player, often there will be laser instrument and damage or become bad phenomenon.
Summary of the invention
Find through research, when system power failure, control chip size of current control signal output terminal, control port not acceptor's core chip controls when, if control port still exports high level and laser drive unit is also in the state that effective operating voltage is powered, size of current control signal output terminal likely exports the numerical value representing larger current signal, and then cause laser drive unit to export big 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 Compact disk player circuit.
A kind of Compact disk player circuit, comprise laser instrument, control chip and laser drive unit, described laser drive unit is for driving described laser instrument, also comprise the first resistance, 3rd resistance, 4th resistance, 6th resistance, first triode, second triode, diode and electric capacity, the size of current control signal output terminal of described control chip and control port are connected with the size of current control signal input end of described laser drive unit and laser instrument Enable Pin respectively, described first triode and the second triode are 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 the first power supply, the negative electrode of described diode is connected with the collector of the first triode by the 3rd resistance, the negative electrode of described diode is connected to ground by electric capacity, the collector of described first triode is connected with the base stage of the second triode by the 6th resistance, the collector of the second triode is connected with ground with the laser instrument Enable Pin of laser drive unit respectively with emitter-base bandgap grading, when Compact disk player circuit power down, described second source is faster than the speed of the first power supply power-fail.
Also comprise the 5th resistance, the first end of described 5th resistance is connected with the negative electrode of diode, and the second end of described 5th resistance is connected with the 3rd resistance respectively at electric capacity.
Also comprise the second resistance, the base stage of described first triode is by the second resistance eutral grounding.
Resistance is serially connected with between described control port and laser instrument Enable Pin.
Described diode is schottky diode.
When power down, laser-enabled end can be pulled to low level by this Compact disk player circuit in time, thus laser drive unit is quit work, even if the size of current control signal output terminal of acceptor's core chip controls does not export the current signal representing bigger numerical, laser drive unit also cannot export larger current and damage laser instrument.
Accompanying drawing explanation
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, a kind of Compact disk player circuit of embodiment, comprise laser instrument, control chip and laser drive unit, described laser drive unit is for driving described laser instrument, control chip have size of current control signal output terminal and control port, laser drive unit has size of current control signal input end and laser instrument Enable Pin, the size of current control signal output terminal of control chip and control port are connected with the size of current control signal input end of laser drive unit and laser instrument Enable Pin respectively.
When control port exports high level, after there is high level in laser instrument Enable Pin, laser drive unit is then started working, control chip is after decoding, the current signal controlling value of corresponding size can be exported to size of current control signal input end at size of current control signal output terminal, laser drive unit exports the electric current of corresponding size to laser instrument according to this current signal controlling value, makes laser instrument luminous.
Control chip is made up of main core chip and peripheral circuit, the operating voltage of usual main core chip is not identical with the operating voltage of peripheral circuit, and the operating voltage of laser drive unit is not identical with the operating voltage of control chip yet, such as a rule, the operating voltage lower (as 1.2V) of the main core chip of control chip, the operating voltage of its peripheral circuit is higher (as 3.3V), and the operating voltage of laser drive unit the highest (as 5V or 8V).
Compact disk player circuit also comprises the first resistance R1, second resistance R2, 3rd resistance R3, 4th resistance R4, 5th resistance R5, 6th resistance R6, first triode Q1, second triode Q2, diode D and electric capacity C, first triode Q1 and the second triode Q2 is NPN triode, the base stage of the first triode Q1 is connected with second source VDD2 by the first resistance R1, simultaneously by the second resistance R2 ground connection, the emitter grounding of the first triode Q1, the collector of the first triode Q1 is by the 4th resistance R4 ground connection, the anode of diode D is connected with the first power vd D1, the negative electrode of diode D is connected with the first end of the 5th resistance R5, second end of the 5th resistance R5 is connected with the collector of the first triode Q1 by the 3rd resistance R3, second end of the 5th resistance R5 is by electric capacity C ground connection, 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, and power supply that in system, power down is the fastest can be selected as second source VDD2, and the slowest power supply of power down is as the first power vd D1.
When Compact disk player circuit has power supply to supply, second source VDD2 makes the first triode Q1 conducting, thus the current potential of the collector of the first triode Q1 is pulled to low level, thus the second triode Q2 is ended, the at this moment controlled chip controls of laser instrument Enable Pin.
When Compact disk player circuit starts power down, due to the power down speed of second source VDD2, so the first triode Q1 ends soon, after Q1 cut-off, first power vd D1 just starts power down, at this moment electric capacity C starts electric discharge, and a discharge path is: through the 3rd resistance R3, the 6th resistance R6 and the second triode Q2, another discharge path is: through the 3rd resistance R3 and the 4th resistance R4.By adjustment electric capacity C, 3rd resistance R3, the parameter of the 6th resistance R6 makes within longer a period of time, the base stage of the second triode Q2 all maintains high level, thus the second triode Q2 conducting, the collector of the second triode Q2 is pulled to low level, thus laser instrument Enable Pin remains on low level state, and laser drive unit quits work.
Simultaneously, the power supply of control chip and laser drive unit also starts power down, when the supply voltage of the main core chip of control chip falls to its operating voltage, even if the level signal of the control port of the peripheral circuit of control chip and size of current control signal output terminal not acceptor's core chip controls, and there is high level or low level at random, if now the supply voltage of laser drive unit is also on effective voltage, when namely still can normally work, if and control port exports high level, the signal that so size of current control signal output terminal exports may export the current signal representing bigger numerical and control numerical value, thus laser drive unit can export big current is burnt by laser instrument or damage.
And because laser instrument Enable Pin has been pulled to low level by the second triode Q2 after power down, so laser drive unit cannot work, available protecting laser instrument.
If do not have diode D, during power down, the electricity of electric capacity C also can to the electric discharge of the first power vd D1 place, thus make the time of the second triode Q2 constant conduction shorten simultaneously.Wherein diode D can adopt schottky diode, can reduce the pressure drop of diode D like this.
Operationally VDD1 is by diode D, and the 5th resistance R5 charges to electric capacity C, thus the charging rate of adjustment electric capacity C; The 5th resistance R5 can certainly be saved.By adjusting the second resistance R2, the parameter of the first resistance R1, can make the first triode Q1 end faster when power down.Resistance R is serially connected with to play the effect of isolation between control port and laser-enabled end.
Claims (5)
1. a Compact disk player circuit, comprise laser instrument, control chip and laser drive unit, described laser drive unit is for driving described laser instrument, it is characterized in that: also comprise the first resistance, 3rd resistance, 4th resistance, 6th resistance, first triode, second triode, diode and electric capacity, the size of current control signal output terminal of described control chip and control port are connected with the size of current control signal input end of described laser drive unit and laser instrument Enable Pin respectively, described first triode and the second triode are 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 the first power supply, the negative electrode of described diode is connected with the collector of the first triode by the 3rd resistance, the negative electrode of described diode is connected to ground by electric capacity, the collector of described first triode is connected with the base stage of the second triode by the 6th resistance, the collector of the second triode is connected with ground with the laser instrument Enable Pin of laser drive unit respectively with emitter-base bandgap grading, when Compact disk player circuit power down, described second source is faster than the speed of the first power supply power-fail.
2. Compact disk player circuit as claimed in claim 1, it is characterized in that: also comprise the 5th resistance, the first end of described 5th resistance is connected with the negative electrode of diode, and the second end of described 5th resistance is connected with electric capacity and the 3rd resistance respectively.
3. Compact disk player circuit as claimed in claim 1 or 2, is characterized in that: also comprise the second resistance, and the base stage of described first triode is by the second resistance eutral grounding.
4. Compact disk player circuit as claimed in claim 1 or 2, is characterized in that: be serially connected with resistance between described control port and laser instrument Enable Pin.
5. Compact disk player circuit as claimed in claim 1 or 2, is characterized in that: described diode is 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 |
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| Publication Number | Publication Date |
|---|---|
| CN103219016A CN103219016A (en) | 2013-07-24 |
| CN103219016B true 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 |
|---|---|
| CN103219016A (en) | 2013-07-24 |
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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. |