CN201917839U - Automatic maintaining voltage adjusting circuit for PDP (Plasma Display Panel) display screen - Google Patents
Automatic maintaining voltage adjusting circuit for PDP (Plasma Display Panel) display screen Download PDFInfo
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- CN201917839U CN201917839U CN2010206482838U CN201020648283U CN201917839U CN 201917839 U CN201917839 U CN 201917839U CN 2010206482838 U CN2010206482838 U CN 2010206482838U CN 201020648283 U CN201020648283 U CN 201020648283U CN 201917839 U CN201917839 U CN 201917839U
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Abstract
The utility model relates to a switch power technology, in particular to an automatic maintaining voltage adjusting circuit for a PDP (Plasma Display Panel) display screen. According to the defects in a traditional technology that in the adjustment of a maintaining voltage of the PDP display screen, the manual intervention is needed, the efficiency is low, and the reliability is bad, the novel automatic maintaining voltage adjusting circuit for the PDP (Plasma Display Panel) display screen is disclosed and used for automatically adjusting the maintaining voltage. The key points of the technical scheme adopted by the circuit are as follows: on the basis of a traditional maintaining voltage adjusting circuit, a constant-current circuit is additionally arranged, and a constant-current value is controlled by PWM (Pulse-Width Modulation) wave output by a microprocessor to act on a feedback circuit, thereby achieving the aim of adjusting an output voltage. The automatic maintaining voltage adjusting circuit has the beneficial effects that the maintaining voltage of the PDP display screen can be adjusted automatically, the efficiency is high, the flexibility is strong, the reliability is high, and the circuit is applicable to adjusting the maintaining voltage of the PDP display screen.
Description
Technical field
The utility model relates to switch power technology, and what relate to a kind of PDP display screen specifically keeps the voltage automatic circuit.
Background technology
Along with the raising day by day of people's living standard, panel TV set spreads in the average family.Panel TV set in the market comprises liquid crystal (LCD) panel TV set, plasma (PDP) televisor and the ultra-thin panel TV set of LED etc.For panel TV set work provides the Switching Power Supply of the necessary energy is one of its core component.Enter 21st century, along with the development that flat panel display is advanced by leaps and bounds, Switching Power Supply is had higher requirement, particularly in PDP TV power supply design a lot of specific (special) requirements are arranged, it is adjustable within the specific limits that one of them is that voltage Vsus is kept in requirement.Keep voltage Vsus promptly after the PDP display screen is lighted, keep it and continue luminous voltage.And, make the voltage of keeping of every display screen also exist difference because the property difference of PDP display screen is bigger, it is adjustable within the specific limits therefore to need this to keep voltage, to meet the different needs.
PDP display screen in the conventional art keep voltage-regulating circuit as shown in Figure 1, it comprises power management IC, feedback circuit and coupled bleeder circuit, and wherein feedback circuit comprises optocoupler Q1, stabilivolt Q2, first resistance R 1, second resistance R 2, the 3rd resistance R 3 and first capacitor C 1; Described bleeder circuit comprises the 4th resistance R 4, the 5th resistance R 5; One of them is adjustable resistance for the 4th resistance R 4 and the 5th resistance R 5, and the negative electrode of described stabilivolt Q2 connects power supply VCC, plus earth by the optocoupler Q1 and first resistance R 1; Described optocoupler Q1 second resistance R 2 in parallel is also passed through the 3rd resistance R 3 connection power management IC; One end of first capacitor C 1 connects the negative electrode of stabilivolt Q2, and the other end connects the reference edge of stabilivolt Q2, and by the 4th resistance R 4 ground connection; The 5th resistance R 5 connects the 4th resistance R 4 and voltage output end Vout.Stabilivolt Q2 generally adopts TL431, and during operate as normal, reference voltage terminal is 2.5V.Therefore in the time of can the counting circuit operate as normal, output end voltage Vout=2.5* (R4+R5)/R4; When output end voltage Vout is higher than setting voltage value, the reference voltage terminal of TL431 is higher than 2.5V, this moment, the TL431 negative electrode was to the anode reverse-conducting, therefore optocoupler Q1 internal body diodes conducting, then its elementary triode conducting, thereby the feedback pin level of power management IC is dragged down, need this moment the manual shift adjustable resistance to make output end voltage Vout reduce.When the output voltage of Vout is lower than setting voltage value, the voltage of TL431 reference edge is lower than 2.5V, and this moment, the TL431 negative pole ended to positive pole, so optocoupler can not conducting, thereby the feedback pin of power management IC is a high level, needs this moment the manual shift adjustable resistance to make output end voltage Vout raise.This shows that the adjusting of keeping voltage at the PDP display screen in the conventional art needs manual intervention, the low and poor reliability of efficient.
The utility model content
Technical problem to be solved in the utility model is: manual intervention, efficient are low, the defective of poor reliability in the conventional art adjusting of keeping voltage of PDP display screen being needed, what propose a kind of novel PDP display screen keeps the voltage automatic circuit, adjusts automatically and keeps voltage.
The utility model solves the problems of the technologies described above the technical scheme that is adopted: the PDP display screen keep the voltage automatic circuit, comprise feedback circuit and coupled bleeder circuit, feedback circuit comprises optocoupler, stabilivolt, first resistance, second resistance and first electric capacity; Described bleeder circuit comprises the 4th resistance, the 5th resistance; The negative electrode of described stabilivolt connects power supply, plus earth by the optocoupler and first resistance; Described optocoupler second resistance in parallel; One end of first electric capacity connects the negative electrode of stabilivolt, and the other end connects the reference edge of stabilivolt, and by the 4th resistance eutral grounding; The 5th resistance connects the 4th resistance and voltage output end; Also comprise constant-current circuit, described constant-current circuit connects bleeder circuit.
Described constant-current circuit comprises microprocessor, operational amplifier, triode, second electric capacity, the 6th resistance, the 7th resistance, the 8th resistance; The electrode input end of described operational amplifier connects microprocessor by the 8th resistance, and by second capacity earth, negative input is by the 6th resistance eutral grounding; The output terminal of the base stage concatenation operation amplifier of described triode, collector connects the reference edge of stabilivolt, and emitter connects the 6th resistance; Described the 7th resistance second electric capacity in parallel.
Further, described constant-current circuit also comprises diode, and described diode cathode is connected with the emitter of triode, and negative pole connects the base stage of triode.
Described stabilivolt is TL431.
The beneficial effects of the utility model are: adjust the voltage of keeping of PDP display screen automatically, the efficient height, dirigibility is strong, reliability is high.
Description of drawings
Fig. 1 is the voltage-regulating circuit of keeping of traditional PDP display screen;
Fig. 2 keeps the voltage automatic circuit for the PDP display screen of embodiment.
Embodiment
The utility model will be further described below in conjunction with drawings and Examples.
Manual intervention, efficient are low, the defective of poor reliability in the conventional art adjusting of keeping voltage of PDP display screen being needed for the utility model, and what propose a kind of novel PDP display screen keeps the voltage automatic circuit, adjusts automatically and keeps voltage.With respect to conventional art, its improvement is: increased constant-current circuit, PWM (pulse-length modulation) the ripple control constant current value by microprocessor output acts on feedback circuit, thereby reaches the purpose of adjusting output voltage.
Its specific implementation is: the PDP display screen keep the voltage automatic circuit, comprise feedback circuit and coupled bleeder circuit, feedback circuit comprises optocoupler, stabilivolt, first resistance, second resistance and first electric capacity; Described bleeder circuit comprises the 4th resistance, the 5th resistance; The negative electrode of described stabilivolt connects power supply, plus earth by the optocoupler and first resistance; Described optocoupler second resistance in parallel; One end of first electric capacity connects the negative electrode of stabilivolt, and the other end connects the reference edge of stabilivolt, and by the 4th resistance eutral grounding; The 5th resistance connects the 4th resistance and voltage output end; Also comprise constant-current circuit, described constant-current circuit connects bleeder circuit.
Embodiment:
As shown in Figure 2, the PDP display screen that this is routine keep the voltage automatic circuit, comprise feedback circuit, bleeder circuit and constant-current circuit; Wherein feedback circuit comprises optocoupler Q1, stabilivolt Q2, first resistance R 1, second resistance R 2 and first capacitor C 1; Described bleeder circuit comprises the 4th resistance R 4, the 5th resistance R 5; Constant-current circuit comprises microprocessor, operational amplifier Q3, triode T1, diode D1, second capacitor C 2, the 6th resistance R 6, the 7th resistance R 7, the 8th resistance R 8; The negative electrode of described stabilivolt Q2 connects power supply VCC, plus earth by the optocoupler Q1 and first resistance R 1; Described optocoupler Q1 second resistance R 2 in parallel; One end of first capacitor C 1 connects the negative electrode of stabilivolt Q2, and the other end connects the reference edge of stabilivolt Q2, and by the 4th resistance R 4 ground connection; The 5th resistance R 5 connects the 4th resistance R 4 and voltage output end Vout; The electrode input end of described operational amplifier Q3 connects microprocessor by the 8th resistance R 8, and by second capacitor C, 2 ground connection, negative input is by the 6th resistance R 6 ground connection; The output terminal of the base stage concatenation operation amplifier Q3 of described triode T1, collector connects the reference edge of stabilivolt Q2, and emitter connects the 6th resistance R 6; Described the 7th resistance R 7 second capacitor C 2 in parallel; Described diode D1 is anodal to be connected with the emitter of triode T1, and negative pole connects the base stage of triode T1.
In this circuit, first resistance R 1 is a current-limiting resistance, required minimum current when second resistance R 2 guarantees stabilivolt Q2 conductings, the 4th resistance R 4, the 5th resistance R 5 play the dividing potential drop effect, be sampling resistor simultaneously, first capacitor C 1 is a feedback compensation electric capacity, the response speed of Control and Feedback.Second capacitor C 2 is a filter capacitor, and diode D1 protection triode T1 is not launched the back-pressure of the utmost point-base stage and damages.
The principle of work of this circuit is: microprocessor is according to the voltage adjustment signal that receives, according to predefined pulsewidth output PWM ripple, when the electrode input end voltage of operational amplifier Q3 was higher than negative input voltage, operational amplifier Q3 exported high level, triode T1 conducting; When the negative input voltage of operational amplifier Q3 is higher than electrode input end voltage, operational amplifier Q3 output low level, triode T1 ends, thereby makes the negative input voltage of operational amplifier Q3 equal electrode input end voltage.When the pulsewidth of PWM is identical, be that operational amplifier Q3 cathode voltage is when constant, the voltage of operational amplifier Q3 negative pole is also constant, and the electric current I that therefore flows through the 6th resistance R 6 is constant: I=(Vpwm*R8)/((R7+R8) * R6), wherein Vpwm is the voltage effective value of the PWM ripple of microprocessor output.Because the voltage of the reference edge of stabilivolt Q2 is stabilized in 2.5V, the equivalent resistance that resistance is Rd that has been equivalent to 4 parallel connections of the 4th resistance R, Rd=2.5/I is Rd=2.5*R6* (R7+R8)/(Vpwm*R8).Therefore, can calculate the final output voltage V out=2.5* of this circuit (R5+ (R4//Rd))/(R4//Rd), wherein, R4//Rd represents the resistance in parallel of the 4th resistance R 4 and equivalent resistance Rd.
Therefore, microprocessor gets final product control output voltage Vout by control pwm pulse width, thereby realizes adjusting automatically the purpose of keeping voltage of PDP display screen.
Claims (4)
1.PDP display screen keep the voltage automatic circuit, comprise feedback circuit and coupled bleeder circuit, feedback circuit comprises optocoupler, stabilivolt, first resistance, second resistance and first electric capacity; Described bleeder circuit comprises the 4th resistance, the 5th resistance; The negative electrode of described stabilivolt connects power supply, plus earth by the optocoupler and first resistance; Described optocoupler second resistance in parallel; One end of first electric capacity connects the negative electrode of stabilivolt, and the other end connects the reference edge of stabilivolt, and by the 4th resistance eutral grounding; The 5th resistance connects the 4th resistance and voltage output end; It is characterized in that: also comprise constant-current circuit, described constant-current circuit connects bleeder circuit.
2. PDP display screen as claimed in claim 1 keep the voltage automatic circuit, it is characterized in that: described constant-current circuit comprises microprocessor, operational amplifier, triode, second electric capacity, the 6th resistance, the 7th resistance, the 8th resistance; The electrode input end of described operational amplifier connects microprocessor by the 8th resistance, and by second capacity earth, negative input is by the 6th resistance eutral grounding; The output terminal of the base stage concatenation operation amplifier of described triode, collector connects the reference edge of stabilivolt, and emitter connects the 6th resistance; Described the 7th resistance second electric capacity in parallel.
3. PDP display screen as claimed in claim 2 keep the voltage automatic circuit, it is characterized in that: described constant-current circuit also comprises diode, described diode cathode is connected with the emitter of triode, negative pole connects the base stage of triode.
As any described PDP display screen of claim 1 to 3 keep the voltage automatic circuit, it is characterized in that: described stabilivolt is TL431.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206482838U CN201917839U (en) | 2010-12-08 | 2010-12-08 | Automatic maintaining voltage adjusting circuit for PDP (Plasma Display Panel) display screen |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206482838U CN201917839U (en) | 2010-12-08 | 2010-12-08 | Automatic maintaining voltage adjusting circuit for PDP (Plasma Display Panel) display screen |
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| CN201917839U true CN201917839U (en) | 2011-08-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010206482838U Expired - Lifetime CN201917839U (en) | 2010-12-08 | 2010-12-08 | Automatic maintaining voltage adjusting circuit for PDP (Plasma Display Panel) display screen |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102404625A (en) * | 2011-11-09 | 2012-04-04 | 北京赛科世纪数码科技有限公司 | Set-top box and standby control method thereof |
| CN103840441A (en) * | 2012-11-23 | 2014-06-04 | 上海空间电源研究所 | Ultra-stable quick-response linear shunting circuit |
| CN104716847A (en) * | 2013-12-12 | 2015-06-17 | 深圳市海洋王照明工程有限公司 | Small-power switching power source circuit and small-power switching power source |
| CN105375785A (en) * | 2015-10-22 | 2016-03-02 | 珠海格力电器股份有限公司 | Household appliance and control circuit and method of switching power supply thereof |
| CN107277978A (en) * | 2017-07-12 | 2017-10-20 | 欧普照明股份有限公司 | A kind of constant current output circuit and lighting device |
| CN108153368A (en) * | 2017-11-22 | 2018-06-12 | 珠海格力电器股份有限公司 | Closed loop feedback voltage stabilizing circuit |
| WO2022199626A1 (en) * | 2021-03-23 | 2022-09-29 | 西安青松光电技术有限公司 | Power supply apparatus and electronic device |
-
2010
- 2010-12-08 CN CN2010206482838U patent/CN201917839U/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102404625A (en) * | 2011-11-09 | 2012-04-04 | 北京赛科世纪数码科技有限公司 | Set-top box and standby control method thereof |
| CN103840441A (en) * | 2012-11-23 | 2014-06-04 | 上海空间电源研究所 | Ultra-stable quick-response linear shunting circuit |
| CN104716847A (en) * | 2013-12-12 | 2015-06-17 | 深圳市海洋王照明工程有限公司 | Small-power switching power source circuit and small-power switching power source |
| CN105375785A (en) * | 2015-10-22 | 2016-03-02 | 珠海格力电器股份有限公司 | Household appliance and control circuit and method of switching power supply thereof |
| CN107277978A (en) * | 2017-07-12 | 2017-10-20 | 欧普照明股份有限公司 | A kind of constant current output circuit and lighting device |
| CN108153368A (en) * | 2017-11-22 | 2018-06-12 | 珠海格力电器股份有限公司 | Closed loop feedback voltage stabilizing circuit |
| WO2022199626A1 (en) * | 2021-03-23 | 2022-09-29 | 西安青松光电技术有限公司 | Power supply apparatus and electronic device |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110803 |
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| CX01 | Expiry of patent term |