CN102368664B - Chip frequency conversion control circuit - Google Patents
Chip frequency conversion control circuit Download PDFInfo
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- CN102368664B CN102368664B CN201110327087.XA CN201110327087A CN102368664B CN 102368664 B CN102368664 B CN 102368664B CN 201110327087 A CN201110327087 A CN 201110327087A CN 102368664 B CN102368664 B CN 102368664B
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Abstract
The invention discloses a chip frequency conversion control circuit which comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a diode, a PNP triode, a first operational amplifier and a second operational amplifier, wherein one end of the first resistor is connected with a second pin of the chip UCC25600, and the other end of the first resistor is connected with the anode of the diode; the cathode of the diode is connected with an output end of the second operational amplifier; and an inverting input end of the second operational amplifier is connected with a feedback current end of a high-voltage lamp tube through the third resistor. The chip frequency conversion control circuit disclosed by the invention is connected with the second pin of the chip UCC25600; and by adjusting the resistance of the second pin, the working frequency of the chip UCC25600 is changed, so that two MOS (metal oxide semiconductor) tubes in a half-bridge circuit work in a soft switch state and the efficiency is high.
Description
[technical field]
The present invention relates to television set, relate in particular to a kind of chip frequency conversion control circuit.
[background technology]
In prior art, adopt the chip UCC25600 of LLC control circuit to be applied in high-voltage inverted control circuit, the PIN5 of this chip UCC25600 and PIN8 output drive signal, driving transformer drives 2 metal-oxide-semiconductor alternations in half-bridge circuit, phase phasic difference 180 is spent, again by the seemingly sinusoidal wave high frequency voltage of high-voltage inverted output class of inverter, drive work backlight afterwards.
But the operating frequency of chip UCC25600 can not change, can not effectively drive two metal-oxide-semiconductors in half-bridge circuit, make these two metal-oxide-semiconductor efficiency lower.
[summary of the invention]
The invention provides a kind of chip frequency conversion control circuit, change the operating frequency of chip UCC25600 by adjusting the resistance sizes of crus secunda of chip UCC25600, two metal-oxide-semiconductors in half-bridge circuit are operated in soft on off state, and efficiency is high.
Technical scheme of the present invention is:
A kind of chip frequency conversion control circuit, comprising: the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance, the tenth resistance, the first electric capacity, the second electric capacity, the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity, diode, PNP triode, the first operational amplifier and the second operational amplifier;
The crus secunda of one chip termination UCC25600 of the first resistance, the anodic bonding of the other end and diode, the negative electrode of diode is connected with the output of the second operational amplifier, the second resistance and the first electric capacity are connected between the inverting input and output of the second operational amplifier, the inverting input of the second operational amplifier is connected with the feedback current end of high pressure fluorescent tube by the 3rd resistance, this inverting input also passes through the second capacity earth, the in-phase input end of the second operational amplifier is by the 3rd electric capacity ground connection respectively, and be connected with one of them power end of the first operational amplifier, the in-phase input end of the second operational amplifier also respectively with one end of the 5th resistance, one end of the 4th resistance connects, the other end ground connection of the 5th resistance, the other end of the 4th resistance is connected with the output of the first operational amplifier, the inverting input of the first operational amplifier is connected with output, and another power end of the first operational amplifier is by the 4th capacity earth, one termination dim signal end of the tenth resistance, the other end of the tenth resistance is connected with one end of the 5th electric capacity and the in-phase input end of the first operational amplifier respectively, the other end ground connection of the 5th electric capacity, one end of one end of the 6th resistance and the 8th resistance connects respectively same power supply, the other end of the 6th resistance is by the 7th grounding through resistance, the other end of the 8th resistance is connected with the base stage of PNP triode and one end of the 9th resistance respectively, the other end ground connection of the 9th resistance, the in-phase input end of the first operational amplifier also respectively with the emitter of PNP triode, the 6th resistance is connected with the tie point of the 7th resistance, the grounded collector of PNP triode.
Chip frequency conversion control circuit of the present invention, be connected with the crus secunda of chip UCC25600, can adjust the resistance sizes of crus secunda, thereby can change the operating frequency of chip UCC25600, make two metal-oxide-semiconductors in half-bridge circuit be operated in soft on off state, efficiency is high.
[brief description of the drawings]
Fig. 1 is chip frequency conversion control circuit of the present invention circuit theory diagrams in one embodiment.
[embodiment]
Below in conjunction with accompanying drawing, specific embodiments of the invention are done to a detailed elaboration.
As Fig. 1, chip frequency conversion control circuit of the present invention, comprising: the first resistance R 1, the 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 7th resistance R 7, the 8th resistance R 8, the 9th resistance R 9, the tenth resistance R 10, the first capacitor C 1, the second capacitor C 2, the 3rd capacitor C 3, the 4th capacitor C 4, the 5th capacitor C 5, diode D1, PNP triode Q1, the first operational amplifier U3A and the second operational amplifier U3B;
The crus secunda of one chip termination UCC25600 of the first resistance R 1, the other end is connected with the anode 1 of diode D1, the negative electrode 2 of diode D1 is connected with the output 7 of the second operational amplifier U3B, the second resistance R 2 and the first capacitor C 1 are connected between the inverting input 6 and output 7 of the second operational amplifier U3B, the inverting input 6 of the second operational amplifier U3B is connected with the feedback current end IS of high pressure fluorescent tube by the 3rd resistance R 3, this inverting input 6 also passes through the second capacitor C 2 ground connection, the in-phase input end 5 of the second operational amplifier U3B is by the 3rd capacitor C 3 ground connection respectively, and be connected with one of them power end 4 of the first operational amplifier U3A, the in-phase input end 5 of the second operational amplifier U3B also respectively with one end of the 5th resistance R 5, one end of the 4th resistance R 4 connects, the other end ground connection of the 5th resistance R 5, the other end of the 4th resistance R 4 is connected with the output 1 of the first operational amplifier U3A, the inverting input 2 of the first operational amplifier U3A is connected with output 1, and another power end 8 (power end 8 in figure connects 5V power supply) of the first operational amplifier U3A is by the 4th capacitor C 4 ground connection, one termination dim signal end DM of the tenth resistance R 10, the other end of the tenth resistance R 10 is connected with one end of the 5th capacitor C 5 and the in-phase input end 3 of the first operational amplifier U3A respectively, the other end ground connection of the 5th capacitor C 5, one end of one end of the 6th resistance R 6 and the 8th resistance R 8 connects respectively same power supply (5V shown in figure), the other end of the 6th resistance R 6 is by the 7th resistance R 7 ground connection, the other end of the 8th resistance R 8 is connected with the base stage 1 of PNP triode Q1 and one end of the 9th resistance R 9 respectively, the other end ground connection of the 9th resistance R 9, the in-phase input end 3 of the first operational amplifier U3A also respectively with the emitter 3 of PNP triode Q1, the 6th resistance R 6 is connected with the tie point of the 7th resistance R 7, collector electrode 2 ground connection of PNP triode Q1.
Feedback current end IS receives the high-voltage lamp tube current detecting, and feeds back to the inverting input 6 of the second operational amplifier U3B, dim signal end DM receives the dim signal that TV SKD is sent, through R10, C5, R8, R9, Q1, R6, the filtering of R7, dividing potential drop and clamped after deliver to the in-phase input end 3 of the first operational amplifier U3A, the output 1 of the first operational amplifier U3A is connected with inverting input 2, form voltage follower, it is the change in voltage that the output voltage of output 1 is followed in-phase input end 3, the change in voltage of in-phase input end 3 is followed the variation of dim signal end DM, the change in voltage of the in-phase input end 5 of the voltage follow second operational amplifier U3B of the inverting input 6 (feedback current of high pressure fluorescent tube) of the second operational amplifier U3B, now the output 7 of the second operational amplifier U3B can be swum the voltage of a variation, this voltage can cause the variation of the crus secunda electric current that flows through chip UCC25600, thereby change the operating frequency of chip UCC25600, control the operating frequency of Inverter, thereby reach the size of controlling operating current backlight, make two metal-oxide-semiconductors in half-bridge circuit be operated in soft on off state, efficiency is high.
Above-described embodiment of the present invention, does not form limiting the scope of the present invention.Any amendment of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in claim protection range of the present invention.
Claims (1)
1. a chip frequency conversion control circuit, it is characterized in that, comprising: the first resistance, the second resistance, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance, the tenth resistance, the first electric capacity, the second electric capacity, the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity, diode, PNP triode, the first operational amplifier and the second operational amplifier;
The crus secunda of one chip termination UCC25600 of the first resistance, the anodic bonding of the other end and diode, the negative electrode of diode is connected with the output of the second operational amplifier, the second resistance and the first electric capacity are connected between the inverting input and output of the second operational amplifier, the inverting input of the second operational amplifier is connected with the feedback current end of high pressure fluorescent tube by the 3rd resistance, this inverting input also passes through the second capacity earth, the in-phase input end of the second operational amplifier is by the 3rd electric capacity ground connection respectively, and be connected with one of them power end of the first operational amplifier, the in-phase input end of the second operational amplifier also respectively with one end of the 5th resistance, one end of the 4th resistance connects, the other end ground connection of the 5th resistance, the other end of the 4th resistance is connected with the output of the first operational amplifier, the inverting input of the first operational amplifier is connected with the output of the first operational amplifier, and another power end of the first operational amplifier is by the 4th capacity earth, one termination dim signal end of the tenth resistance, the other end of the tenth resistance is connected with one end of the 5th electric capacity and the in-phase input end of the first operational amplifier respectively, the other end ground connection of the 5th electric capacity, one end of one end of the 6th resistance and the 8th resistance connects respectively same power supply, the other end of the 6th resistance is by the 7th grounding through resistance, the other end of the 8th resistance is connected with the base stage of PNP triode and one end of the 9th resistance respectively, the other end ground connection of the 9th resistance, the in-phase input end of the first operational amplifier also respectively with the emitter of PNP triode, the 6th resistance is connected with the tie point of the 7th resistance, the grounded collector of PNP triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110327087.XA CN102368664B (en) | 2011-10-25 | 2011-10-25 | Chip frequency conversion control circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110327087.XA CN102368664B (en) | 2011-10-25 | 2011-10-25 | Chip frequency conversion control circuit |
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| Publication Number | Publication Date |
|---|---|
| CN102368664A CN102368664A (en) | 2012-03-07 |
| CN102368664B true CN102368664B (en) | 2014-07-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201110327087.XA Active CN102368664B (en) | 2011-10-25 | 2011-10-25 | Chip frequency conversion control circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116708997B (en) * | 2023-08-09 | 2023-10-27 | 深圳市锐斯特科技有限公司 | Remote shutter control device of automobile data recorder |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101951137A (en) * | 2010-10-12 | 2011-01-19 | 苏州大学 | High-voltage start-up circuit |
| CN202309508U (en) * | 2011-10-25 | 2012-07-04 | 深圳麦格米特电气股份有限公司 | Frequency conversion control circuit for chip |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6898093B2 (en) * | 2003-06-24 | 2005-05-24 | Toshiba International Corporation | Power conversion circuit with clamp and soft start |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101951137A (en) * | 2010-10-12 | 2011-01-19 | 苏州大学 | High-voltage start-up circuit |
| CN202309508U (en) * | 2011-10-25 | 2012-07-04 | 深圳麦格米特电气股份有限公司 | Frequency conversion control circuit for chip |
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| CN102368664A (en) | 2012-03-07 |
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