CN101192069A - Multipath DC voltage-stabilizing output circuit - Google Patents
Multipath DC voltage-stabilizing output circuit Download PDFInfo
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- CN101192069A CN101192069A CNA2006101570718A CN200610157071A CN101192069A CN 101192069 A CN101192069 A CN 101192069A CN A2006101570718 A CNA2006101570718 A CN A2006101570718A CN 200610157071 A CN200610157071 A CN 200610157071A CN 101192069 A CN101192069 A CN 101192069A
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Abstract
A multi-path DC stabilized voltage output circuit comprises a feedback circuit, a sampling circuit, a power supply master control chip, a first path output terminal, a second path output terminal, a first half-wave rectification circuit, a first filtering circuit, a second half-wave rectification circuit, a second filtering circuit, a transformer and a balance control circuit, wherein, the transformer provides a high voltage for the first path terminal in turn through the first half-wave rectification circuit and the first filtering circuit, and provides a low voltage for the second path terminal in turn through the second half-wave rectification circuit and the second filtering circuit; the balance control circuit is used for carrying out balance control of the voltage at the second path output terminal; and the first path output terminal and the second path output terminal carry out feedback adjustment of the transformer in turn through the sampling circuit, the feedback circuit and the power supply master control chip.
Description
Technical field
The present invention relates to a kind of multi-channel DC voltage stabilization output circuit.
Background technology
At present, multi-channel DC voltage stabilization output circuit has been widely used in the various electronic products such as LCD, computer motherboard, notebook computer as driving power.For example, general LCD all adopts multi-channel DC voltage stabilization output circuit as driving power, this backlight liquid crystal display driving circuit is provided by the high-pressure side of this multi-channel DC voltage stabilization output circuit, and the liquid crystal panel drive circuit of this LCD is provided by the low pressure end of this multi-channel DC voltage stabilization output circuit.
Seeing also Fig. 1, is a kind of circuit diagram of multi-channel DC voltage stabilization output circuit of prior art.This multi-channel DC voltage stabilization output circuit 1 comprises a transformer 10, a main power control chip 11, a feedback circuit 12, a sample circuit 19, one first half-wave rectifying circuit 13, one second half-wave rectifying circuit 14, one first filtering circuit 15, one second filtering circuit 16, a first via output terminal 17 and one the second road output terminal 18.
This sample circuit 19 comprises one first resistance 191, one second resistance 192, one the 3rd resistance 193 and a feedback node 194.One end of this first resistance 191, this second resistance 192 and the 3rd resistance 193 is connected to this feedback circuit 12 by this feedback node 194.The other end of this first resistance 191 is connected to this first output terminal 17, and the other end of this second resistance 192 is connected to the other end ground connection of these second output terminal, 18, the three resistance 193.This sample circuit 19 is used for the voltage of this first via output terminal 17 and this second road output terminal 18 is taken a sample, and this feedback node 194 provides a sampling mixed-voltage for this feedback circuit 12.When the sampling mixed-voltage of this feedback node 194 was 2.5V, this feedback circuit 12 was not worked.When the sampling mixed-voltage of this feedback node 194 is greater than or less than 2.5V, these feedback circuit 12 work.This second resistance 192 is bigger, is about 91K ohm, and this first resistance 191 is less, is about 12K ohm.The 3rd resistance 193 is about 8K ohm.
This first half-wave rectifying circuit 13 comprises one first commutation diode 132 and the one one RC series circuit 131 in parallel with this first commutation diode 132.The anode of this first commutation diode 132 (not indicating) is connected to this transformer 10, and negative electrode (not indicating) is connected to this first filtering circuit 15.
This second half-wave rectifying circuit 14 comprises one second commutation diode 142 and the one two RC series circuit 141 in parallel with this second commutation diode 142.The anode of this second commutation diode 142 (not indicating) is connected to this transformer 10, and negative electrode (not indicating) is connected to this second filtering circuit 16.
This transformer 10 provides voltage by this first half-wave rectifying circuit 13 and this first filtering circuit 15 for this first via output terminal 17 successively, and provides voltage by this second half-wave rectifying circuit 14 and this second filtering circuit 16 for this second road output terminal 18 successively.This first via output terminal 17 is used to export one than low dc voltage, 5V for example, and this second road output terminal 18 is used to export one than High Level DC Voltage, for example 18V.
This feedback circuit 12 is used for the variation of the sampling mixed-voltage of this sample circuit 19 is fed back to this main power control chip 11.This main power control chip 11 is adjusted and is outputed to the pulse duty factor of this transformer 10, thereby adjust the output of this transformer 10 according to the variation of these feedback circuit 12 feedback voltages.
During this multi-channel DC voltage stabilization output circuit 1 of liquid crystal display applications, this first via output terminal 17 provides 5V voltage for the liquid crystal panel drive circuit of this LCD, and this second road output terminal 18 provides 18V voltage for this backlight liquid crystal display driving circuit.
When this LCD starts, these first via output terminal 17 bringing onto loads, because this moment, this backlight liquid crystal display driving circuit was not opened as yet, these the second road output terminal, 18 zero loads.Because these first via output terminal 17 bringing onto loads, make the voltage of this first via output terminal 17 be reduced to about 4.3V, in addition, during these first via output terminal 17 bringing onto loads, the pressure drop at these first commutation diode, 132 two ends slightly raises, and further makes the voltage of this first via output terminal 17 be reduced to and is about 4V.These the second road output terminal, 18 zero loads, its voltage is constant.
The voltage of this first via output terminal 17 is reduced to and is about 4V, the electric current of this first resistance 191 of flowing through is reduced, and the electric current of this second resistance 192 of flowing through is constant, by the node current law, the electric current of the 3rd resistance 193 of flowing through reduces, thereby make the sampling mixed-voltage of this feedback node 194 reduce, it is lower than 2.5V, the voltage that this moment, this feedback circuit 12 outputed to this main power control chip 11 reduces, and then make this main power control chip 11 increase the pulse duty factor that outputs to this transformer 10, cause the voltage of this first via output terminal 17 and this second road output terminal 18 to increase.
When the voltage of this first via output terminal 17 was elevated to about 4.5V, the voltage of this second road output terminal 18 waftd high to about 28V.The electric current of this first resistance 191 and this second resistance 192 of flowing through increases, and by calculating as can be known, the electric current of the 3rd resistance 193 of flowing through increases, and makes the sampling mixed-voltage of this feedback node 194 be elevated to 2.5V, and this feedback circuit 12 quits work.But this moment, the voltage of this first via output terminal 17 was 4.5V only, was lower than the necessary 5V voltage of this liquid crystal panel drive circuit work, this LCD cisco unity malfunction, thereby the reliability of this multi-channel DC voltage stabilization output circuit 1 is lower.
Summary of the invention
For solving the lower problem of multi-channel DC voltage stabilization output circuit reliability in the prior art, be necessary the multi-channel DC voltage stabilization output circuit that provides a kind of reliability higher.
A kind of multi-channel DC voltage stabilization output circuit, it comprises a feedback circuit, a sample circuit; One main power control chip, a first via output terminal, one the second road output terminal, one first half-wave rectifying circuit, one first filtering circuit, one second half-wave rectifying circuit, one second filtering circuit, a transformer and a balance control circuit; This transformer provides low-voltage by this first half-wave rectifying circuit and this first filtering circuit for this first via output terminal successively, and provides high voltage by this second half-wave rectifying circuit and this second filtering circuit for this second road output terminal successively; This balance control circuit is used for the voltage of this second road output terminal is carried out Balance Control; This first via output terminal and the second road output terminal carry out feedback regulation by this sample circuit, feedback circuit and main power control chip to the pulse duty factor of this transformer successively, thereby adjust the voltage of this first via output terminal and this second road output terminal.
One multi-channel DC voltage stabilization output circuit, it comprises a first via output terminal, one the second road output terminal and a balance control circuit, this balance control circuit is connected with this second road output terminal with this first via output terminal, is used for the voltage of this second road output terminal is carried out Balance Control.
Compared to prior art, this multi-channel DC voltage stabilization output circuit further comprises this balance control circuit, when the voltage of this second road output terminal wafts when high, this balance control circuit makes the second road output terminal high voltage that wafts reduce, by feedback circuit, make the voltage of this first via output terminal and the second road output terminal attitude that restores balance.So the reliability of this multi-channel DC voltage stabilization output circuit is higher.
Description of drawings
Fig. 1 is a kind of circuit diagram of prior art multi-channel DC voltage stabilization output circuit.
Fig. 2 is the circuit diagram of multi-channel DC voltage stabilization output circuit one better embodiment of the present invention.
Embodiment
Seeing also Fig. 2, is the circuit diagram of multi-channel DC voltage stabilization output circuit one better embodiment of the present invention.Only be output as example with two the tunnel among the figure, the principle of other multichannel output is identical therewith, so no longer further give an example.
This multi-channel DC voltage stabilization output circuit 2 comprises a transformer 20, a sample circuit 30, a main power control chip 21, a feedback circuit 22, one first half-wave rectifying circuit 23, one second half-wave rectifying circuit 24, one first filtering circuit 25, one second filtering circuit 26, a first via output terminal 27 and one the second road output terminal 28 and a balance control circuit 29.
This sample circuit 30 comprises one first resistance 301, one second resistance 302, one the 3rd resistance 303 and a feedback node 304.One end of this first resistance 301, this second resistance 302 and the 3rd resistance 303 is connected to this feedback circuit 22 by this feedback node 304.The other end of this first resistance 301 is connected to this first output terminal 27, and the other end of this second resistance 302 is connected to the other end ground connection of these second output terminal, 28, the three resistance 303.This sample circuit 30 is used for this first via output terminal 27 and the voltage of this second road output terminal 28 are taken a sample, and this feedback node 304 provides a sampling mixed-voltage for this feedback circuit 22.When the sampling mixed-voltage of this feedback node 304 was 2.5V, this feedback circuit 22 was not worked.When the sampling mixed-voltage of this feedback node 304 is greater than or less than 2.5V, these feedback circuit 22 work.This second resistance 302 is bigger, is about 91K ohm, and this first resistance 301 is less, is about 12K ohm, and the 3rd resistance 303 is about 8K ohm.
This first half-wave rectifying circuit 23 comprises one first commutation diode 232 and the one one RC series circuit 231 in parallel with this first commutation diode 232.The anode of this first commutation diode 232 (not indicating) is connected to this transformer 20, and negative electrode (not indicating) is connected to this first filtering circuit 25.This first filtering circuit 25 is a π type filtering circuit.This first commutation diode 232 can be a kind of in germanium diode, silicon rectifier diode and the gallium arsenide diode.
This second half-wave rectifying circuit 24 comprises one second commutation diode 242 and the one two RC series circuit 241 in parallel with this second commutation diode 242.The anode of this second commutation diode 242 (not indicating) is connected to this transformer 20, and negative electrode (not indicating) is connected to this second filtering circuit 26.This second filtering circuit 26 is a π type filtering circuit.This second commutation diode 242 can be a kind of in germanium diode, silicon rectifier diode and the gallium arsenide diode.
This balance control circuit comprises a transistor 291, a clamp diode 292 (Clamping Diode), a current-limiting resistance 293 and a balance resistance 294.The base stage 2911 of this transistor 291 is connected to this second road output terminal 28 by the anode 2921 and the negative electrode 2922 of this current-limiting resistance 293, this clamp diode 292 successively, collector 2912 is connected to this second road output terminal 28 by this balance resistance 294, and emitter 2913 is connected to this first via output terminal 27.This balance resistance 294 is 100 ohm.This current-limiting resistance 293 is 200 ohm, and its electric current of base stage 2911 that is used to prevent this transistor 291 is excessive.This transistor 291 can be a NPN transistor or a N channel depletion type mos field effect transistor.
This transformer 20 provides voltage by this first half-wave rectifying circuit 23 and this first filtering circuit 25 for this first via output terminal 27, and provides voltage by this second half-wave rectifying circuit 24 and this second filtering circuit 26 for this second road output terminal 28.This first via output terminal 27 is used to export one than low dc voltage, 5V for example, and this second road output terminal 28 is used to export one than High Level DC Voltage, for example 18V.
This feedback circuit 22 is used for the variation of the sampling mixed-voltage of this sample circuit 30 is fed back to this main power control chip 21.This main power control chip 21 is adjusted and is outputed to the pulse duty factor of this transformer 20, thereby adjust the output of this transformer 20 according to the variation of these feedback circuit 12 feedback voltages.
During this multi-channel DC voltage stabilization output circuit 2 of liquid crystal display applications, this first via output terminal 27 provides 5V voltage for the liquid crystal panel drive circuit of this LCD, and this second road output terminal 28 provides 18V voltage for this backlight liquid crystal display driving circuit.
When this LCD starts, these first via output terminal 27 bringing onto loads, because this moment, this backlight liquid crystal display driving circuit was not opened as yet, these the second road output terminal, 28 zero loads.Because these first via output terminal 27 bringing onto loads, make the voltage of this first via output terminal 27 be reduced to about 4.3V, in addition, during these first via output terminal 27 bringing onto loads, the pressure drop at these first commutation diode, 232 two ends slightly raises, and further makes the voltage of this first via output terminal 27 be reduced to and is about 4V.These the second road output terminal, 28 zero loads, its voltage is constant.
The voltage of this first via output terminal 27 is reduced to and is about 4V, the electric current of this first resistance 301 of flowing through is reduced, and the electric current of this second resistance 302 of flowing through is constant, by the node current law, the electric current of the 3rd resistance 303 of flowing through reduces, thereby make the sampling mixed-voltage of this feedback node 304 reduce, it is lower than 2.5V, the voltage that this moment, this feedback circuit 22 outputed to this main power control chip 21 reduces, and then make this main power control chip 21 increase the pulse duty factor that outputs to this transformer 20, cause the voltage of this first via output terminal 27 and this second road output terminal 28 to increase.
The voltage of this second road output terminal 28 is elevated to certain altitude, for example during 22V, be added on voltage on this clamp diode 292 greater than its breakdown reverse voltage, these clamp diode 292 reverse-conductings, and then make these transistor 291 conductings, make this balance resistance 294 become a load that loads on this second road output terminal 28, this load makes the output voltage of this second road output terminal 28 drop to about 18V.
The voltage of this first via output terminal 27 is elevated to and is about 4.5V, be lower than 5V, thereby the sampling mixed-voltage of this feedback node 304 is lower than 2.5V, this main power control chip 21 further increases the pulse duty factor that outputs to this transformer 20, make the voltage of this first via output terminal 27 further raise, return to 5V.Because the effect of balancing circuitry 29, the voltage of this second output terminal 28 remains on about 18V.Thereby this first via output terminal 27 and this second output terminal 28 drive this LCD operate as normal, so the reliability of this multi-channel DC voltage stabilization output circuit 2 is higher.
Above-mentioned multi-channel DC voltage stabilization output circuit 2 further comprises this balance control circuit 29, when the voltage of this second road output terminal 28 wafts when high, this balance control circuit 29 makes this second road output terminal 28 high voltage that wafts reduce, by this feedback circuit 22, make the voltage of this first via output terminal 27 and this second road output terminal 28 attitude that restores balance.So the reliability of this multi-channel DC voltage stabilization output circuit 2 is higher.
Multi-channel DC voltage stabilization output circuit 2 of the present invention also can have multiple other design, for example: this multi-channel DC voltage stabilization output circuit 2 may further include a Third Road output terminal, one the four road output terminal and one the five road output terminal, be connected a balance control circuit 29 between each road output terminal and this first via output terminal, 29 pairs of voltages of this balance control circuit high output end voltage that wafts is controlled.
Claims (10)
1. multi-channel DC voltage stabilization output circuit, it comprises a feedback circuit, a sample circuit, a main power control chip, a first via output terminal, one the second road output terminal, one first half-wave rectifying circuit, one first filtering circuit, one second half-wave rectifying circuit, one second filtering circuit and a transformer, this transformer provides low-voltage by this first half-wave rectifying circuit and this first filtering circuit for this first via output terminal successively, and provides high voltage by this second half-wave rectifying circuit and this second filtering circuit for this second road output terminal successively; This first via output terminal and the second road output terminal carry out feedback regulation by this sample circuit, feedback circuit and main power control chip to the pulse duty factor of this transformer successively, thereby adjust the voltage of this first via output terminal and this second road output terminal, it is characterized in that: this multi-channel DC voltage stabilization output circuit further comprises a balance control circuit, and it is used for the voltage of this second road output terminal is carried out Balance Control.
2. multi-channel DC voltage stabilization output circuit as claimed in claim 1, it is characterized in that: this balance control circuit comprises a transistor, a clamp diode, a current-limiting resistance and a balance resistance, this transistorized base stage is connected to this second road output terminal by the anode and the negative electrode of this current-limiting resistance, this clamp diode successively, collector is connected to this second road output terminal by this balance resistance, and emitter is connected to this first via output terminal.
3. multi-channel DC voltage stabilization output circuit as claimed in claim 2 is characterized in that: this transistor is a NPN transistor.
4. multi-channel DC voltage stabilization output circuit as claimed in claim 2 is characterized in that: this transistor is a N channel depletion type mos field effect transistor.
5. multi-channel DC voltage stabilization output circuit as claimed in claim 1, it is characterized in that: this first half-wave rectifying circuit comprises one first commutation diode and the one one RC series circuit in parallel with this first commutation diode, the anode of this first commutation diode is connected to this transformer, and negative electrode is connected to this first filtering circuit; This second half-wave rectifying circuit comprises one second commutation diode and the one two RC series circuit in parallel with this second commutation diode, and the anode of this second commutation diode is connected to this transformer, and negative electrode is connected to this second filtering circuit.
6. multi-channel DC voltage stabilization output circuit as claimed in claim 1, it is characterized in that: this sample circuit comprises one first resistance, one second resistance, one the 3rd resistance and a feedback node, one end of this first resistance, this second resistance and the 3rd resistance is connected to this feedback circuit by this feedback node, the other end of this first resistance is connected to this second output terminal, the other end of this second resistance is connected to this first output terminal, the other end ground connection of the 3rd resistance.
7. a multi-channel DC voltage stabilization output circuit, it comprises a first via output terminal and one the second road output terminal, it is characterized in that: this multi-channel DC voltage stabilization output circuit further comprises a balance control circuit, this balance control circuit is connected with this second road output terminal with this first via output terminal, is used for the voltage of this second road output terminal is carried out Balance Control.
8. multi-channel DC voltage stabilization output circuit as claimed in claim 7, it is characterized in that: this balance control circuit comprises a transistor, a clamp diode, a current-limiting resistance and a balance resistance, this transistorized base stage is connected to this second road output terminal by the anode and the negative electrode of this current-limiting resistance, this clamp diode successively, collector is connected to this second road output terminal by this balance resistance, and emitter is connected to this first via output terminal.
9. multi-channel DC voltage stabilization output circuit as claimed in claim 8, it is characterized in that: this multi-channel DC voltage stabilization output circuit further comprises a transformer, one first half-wave rectifying circuit, one first filtering circuit, one second half-wave rectifying circuit and one second filtering circuit, this first via output terminal provides low-voltage by one first half-wave rectifying circuit and one first filtering circuit successively by a transformer, and this second road output terminal provides high voltage by one second half-wave rectifying circuit and one second filtering circuit successively by a transformer.
10. multi-channel DC voltage stabilization output circuit as claimed in claim 9, it is characterized in that: this multi-channel DC voltage stabilization output circuit further comprises a sample circuit, a feedback circuit and a main power control crystalline substance, this first via output terminal and this second road output terminal carry out feedback regulation by a sample circuit, a feedback circuit and a main power control chip to the pulse duty factor of this transformer successively, thereby adjust the voltage of this first via output terminal and this second road output terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006101570718A CN101192069A (en) | 2006-11-24 | 2006-11-24 | Multipath DC voltage-stabilizing output circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006101570718A CN101192069A (en) | 2006-11-24 | 2006-11-24 | Multipath DC voltage-stabilizing output circuit |
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| CN101192069A true CN101192069A (en) | 2008-06-04 |
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| CNA2006101570718A Pending CN101192069A (en) | 2006-11-24 | 2006-11-24 | Multipath DC voltage-stabilizing output circuit |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101727123B (en) * | 2009-11-18 | 2011-10-12 | 苏州麦格芯微电子有限公司 | Intelligent self-adaption driving stage control system and method of integrated circuit chip |
| CN101894527B (en) * | 2009-05-22 | 2012-05-30 | 纬创资通股份有限公司 | Power supply method and power supply device for liquid crystal display device |
| CN103151006A (en) * | 2013-02-04 | 2013-06-12 | 威海大宇电子有限公司 | Dynamic voltage regulation power supply circuit and displayer using power supply circuit |
| CN110599972A (en) * | 2019-08-14 | 2019-12-20 | 昆山龙腾光电股份有限公司 | Power supply circuit and driving device |
| CN111913421A (en) * | 2020-08-08 | 2020-11-10 | 苏州喻芯半导体有限公司 | Power supply cabin chip internal performance adjusting structure and adjusting method |
-
2006
- 2006-11-24 CN CNA2006101570718A patent/CN101192069A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101894527B (en) * | 2009-05-22 | 2012-05-30 | 纬创资通股份有限公司 | Power supply method and power supply device for liquid crystal display device |
| CN101727123B (en) * | 2009-11-18 | 2011-10-12 | 苏州麦格芯微电子有限公司 | Intelligent self-adaption driving stage control system and method of integrated circuit chip |
| CN103151006A (en) * | 2013-02-04 | 2013-06-12 | 威海大宇电子有限公司 | Dynamic voltage regulation power supply circuit and displayer using power supply circuit |
| CN110599972A (en) * | 2019-08-14 | 2019-12-20 | 昆山龙腾光电股份有限公司 | Power supply circuit and driving device |
| CN110599972B (en) * | 2019-08-14 | 2021-09-10 | 昆山龙腾光电股份有限公司 | Power supply circuit and driving device |
| CN111913421A (en) * | 2020-08-08 | 2020-11-10 | 苏州喻芯半导体有限公司 | Power supply cabin chip internal performance adjusting structure and adjusting method |
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Open date: 20080604 |