CN100403640C - Electrical power control unit - Google Patents
Electrical power control unit Download PDFInfo
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- CN100403640C CN100403640C CNB021450749A CN02145074A CN100403640C CN 100403640 C CN100403640 C CN 100403640C CN B021450749 A CNB021450749 A CN B021450749A CN 02145074 A CN02145074 A CN 02145074A CN 100403640 C CN100403640 C CN 100403640C
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Abstract
The present invention relates to a power supply control device used for a display, which can make voltage stored in a secondary level outputted after a certain delaying time. The power supply control device does not need a buffering loop and is capable of inhibiting a switching terminal from generating pulse voltage during switching on. The present invention is composed of the following parts: a transformer, a switching part, a switching control loop, a rectification part, a smooth part and a pulse voltage control part, wherein the transformer can make voltage which is inputted to a primary level stored into the secondary level; the switching part regulates the voltage of the transformer; the switching control loop controls the switching on and the switching off of the switching part; the rectification part and the smooth part rectify and smooth the voltage at the secondary level of the transformer; the pulse voltage control part is used for inhibiting the pulse voltage of the switching part and is connected in the fixed position at the secondary level of the transformer. When the switching terminal is switched off, the stored voltage is delayed for a certain time through the transformer; thus, an output current can not circulate in a certain time. Therefore, the present invention can inhibit overvoltage at an initial stage during switching. Besides, the present invention can not generate retrace voltage in the instant time when the switching terminal is switched on. Therefore, the present invention can reduce the effect of the pulse voltage.
Description
(1) technical field
The present invention relates to a kind of supply unit of display, particularly about suppressing the power control of the switch terminal pulse voltage of Switching Power Supply in the display.
(2) background technology
Technology below with reference to the power control of description of drawings prior art.
The loop diagram of the power control that is to use prior art shown in Figure 1.
The power control of prior art is by forming as the lower part:
Input is stored into secondary transformer T1 at elementary voltage; Adjust the switch portion Q1 of above-mentioned transformer T1 voltage; The switch control circuit 20 of the above-mentioned switch portion Q1 of control "on" and "off"; Be connected the elementary two ends of above-mentioned transformer T1, absorb the buffer loop 10 of the pulse voltage of above-mentioned switch portion Q1; Rectification is stored in the rectification part 30 of the secondary voltage of above-mentioned transformer T1; And the partes glabra 40 of the voltage of level and smooth above-mentioned rectification part 30 rectifications output.
Above-mentioned transformer T1 is made up of following part:
The first coil NP of elementary reception direct voltage, and input at the voltage of the above-mentioned first coil NP, according to coil than being stored in secondary second, third and the 4th coil Ns1, Ns2 and Ns3.
Above-mentioned rectification part 30 is made up of first, second and third triode D1, D2 and the D3 of second, third and the 4th coil Ns1, Ns2 and the Ns3 that are connected on above-mentioned transformer T1 respectively, and above-mentioned partes glabra 40 is made up of second, third and the 4th capacitor C2, the C3 that are connected on first, second and third triode D1, D2 and D3 respectively and C4.
So the operating principle of the power control of the prior art of forming is as follows:
At first, direct voltage VIDC is input to the first coil Np1 by the first capacitor C1, according to the voltage of input at the above-mentioned first coil Np1, at the drain of above-mentioned switch portion Q1 terminal input current Id.
At the drain of above-mentioned switch portion Q1 terminal feeding during electric current I d, according to from above-mentioned switch control circuit 20 to the signal that the gate of above-mentioned switch portion Q1 terminal sends, determine whether opening of above-mentioned switch portion Q1.
When the gate of above-mentioned switch portion Q1 terminal has been imported low (Low) signal that above-mentioned switch control circuit 20 sends, open above-mentioned switch portion Q1.
At this moment, open above-mentioned switch portion 1, the crest voltage V that the inductance that 10 above-mentioned transformer T1 of inhibition of above-mentioned buffer loop reveal causes
LKFunction.
Do not have above-mentioned buffer loop 10 in other words, shown in Fig. 2 a, can know the crest voltage V of input at the voltage Vds of the drain of switch portion terminal
LKVery big, during if any above-mentioned buffer loop 10, shown in Fig. 2 b, can see crest voltage V
LKBe reduced.
In addition, input is that coil according to second to the 4th coil Ns1, Ns2, Ns3 is than storing at the voltage of the above-mentioned first coil Np1, be stored in the voltage of the above-mentioned second coil Ns1 afterwards, by the first diode D1 rectification, and by the level and smooth back output of the second capacitor C2 first voltage Vo1.
The voltage that is stored in above-mentioned tertiary coil Ns2 is to be exported the second voltage Vo2. by the second diode D2 and the 3rd capacitor C3 by rectification and level and smooth back
The voltage that is stored in above-mentioned the 4th coil Ns3 is to be exported tertiary voltage Vo3 by the 3rd diode D3 and the 4th capacitor C4 by rectification and level and smooth back.
Power control according to the prior art manufacturing as described above has following problem: reduce at the crest voltage of the drain of switch portion terminal in order to make input, should use buffer loop to suppress crest voltage, but such consequence is the switch terminal heating that causes switch portion.
(3) summary of the invention
The present invention is the design that proposes in order to solve problem as above, its purpose is exported the power control of the pulse voltage that takes place when not needing other buffer loop just can suppress to open switch terminal after being to provide a kind of handle to be stored in secondary power supply delay certain hour.
The object of the present invention is achieved like this:
A kind of power control comprises:
Input is stored in the first secondary transformer at elementary voltage, and this first transformer comprises that an end is connected first coil of first capacitor, and according to coil than being stored in secondary second, third, the 4th coil;
Adjust the switch portion of the stored voltage of described first transformer;
Control the switch control circuit of the "on" and "off" of described switch portion;
Rectification and the rectification part and the partes glabra that smoothly are stored in the voltage of described first transformer secondary output, described rectification part by be connected on respectively above-mentioned first transformer second, third, first, second, third triode of the 4th coil forms, described partes glabra by be connected on respectively first, second, third triode second, third, the 4th capacitor forms; And,
In order to suppress the pulse voltage of described switch portion, be connected the pulse voltage control part of described first transformer secondary output, described pulse voltage control part comprises following parts: rectification is stored in the 4th diode of voltage of the secondary tertiary coil of described transformer; Be connected the negative electrode of above-mentioned the 4th diode, store second transformer of the voltage of described the 4th diode rectification; An elementary end of described second transformer connects the collector electrode of a transistor seconds; One end of the base stage of described transistor seconds connects one the 5th capacitor and a resistance; An other end ground connection of above-mentioned the 5th capacitor; The other end of above-mentioned resistance is connected the end that second transformer is connected with above-mentioned the 4th diode cathode; Second of a secondary end of above-mentioned second transformer and the secondary coil of above-mentioned first transformer is connected the secondary other end ground connection of above-mentioned second transformer with the tie point of the 4th coil.
Aforesaid power control of the present invention has following effect.
The first, when opening switch terminal, the voltage delay certain hour that stores is stopped certain hour to output current by transformer, effectively suppress the initial stage overvoltage of switch terminal.
The second, the moment of opening switch terminal the voltage that flybacks can not occur, and can reduce the pulse voltage of switch terminal.
The 3rd, deleted the buffer loop that prior art is used, the heating that has increased the efficient of switch terminal and reduced switch terminal.
For further specifying above-mentioned purpose of the present invention, design feature and effect, the present invention is described in detail below with reference to accompanying drawing.
(4) description of drawings
Fig. 1 is the power control loop diagram of prior art;
Fig. 2 a, 2b be respectively the buffer loop in the presentation graphs 1 have, when no, input is at the figure of the voltage waveform of the drain of switch portion terminal;
Fig. 3 is the loop diagram of power control constructed in accordance;
Fig. 4 is the voltage oscillogram of the switch portion among Fig. 3;
Fig. 5 is the figure of the output input waveform of the pulse voltage control part in the presentation graphs 3;
Fig. 6 is the loop diagram according to the operation embodiment of power control of the present invention.
(5) embodiment
Below, the accompanying drawing of reference example describes the structure of controller for power supply of display of the present invention in detail.
Fig. 3 is the loop diagram of controller for power supply of display constructed in accordance.
Controller for power supply of display is as shown in Figure 3 made in accordance with the present invention, by constituting as the lower part; Input is stored into the first secondary transformer T11 at elementary voltage; Adjust the switch portion Q11 of the above-mentioned first transformer T11 voltage; The switch control circuit 100 of the above-mentioned switch portion Q11 of control "on" and "off"; Rectification is stored in the rectification part 300 of the secondary voltage of the above-mentioned first transformer T11; The partes glabra 400 of the voltage that level and smooth above-mentioned rectification part 300 rectifications go out; And, be connected the pulse voltage control part 200 of above-mentioned transformer secondary output institute allocation in order to suppress the pulse voltage of above-mentioned switch portion.
The above-mentioned first transformer T11 is made up of following part:
One end be connected the first capacitor C11 the first coil Np11 and, according to coil than being stored in secondary second to the 4th coil Ns11, Ns12 and Ns13.
Above-mentioned rectification part 300 is made up of first to the 3rd triode D11, D12 and the D13 of second to the 4th coil Ns11, the Ns12 that are connected on the above-mentioned first transformer T11 respectively and Ns13, and above-mentioned partes glabra 400 is made up of second to the 4th capacitor C12, the C13 and the C14 that are connected on first to the 3rd triode D11, D12 and D13 respectively.
Above-mentioned pulse voltage control part 200 is made up of following parts:
The inductor 201 that connects the end of the above-mentioned second and the 4th coil Ns11 and Ns13; Receive the voltage of the tie point output of the above-mentioned the 3rd and the 4th coil Ns12 and Ns13, and this voltage is delayed the delay loop 202 of certain hour; And the signal that receives above-mentioned delay loop 202 comes inductive switching device 201, and switch loop 203 parts such as grade of phase saturation induction device are formed weekly.
The following describes the operating principle of power control constructed in accordance.
At first, direct voltage VIDC is input to the first coil Np11 by the first capacitor C11, according to the voltage of input at the above-mentioned first coil Np11, at the drain of above-mentioned switch portion Q11 terminal input current Id.
At the drain of above-mentioned switch portion Q11 terminal feeding during electric current, according to from above-mentioned switch control circuit 100 to the signal that above-mentioned switch portion Q11gate terminal sends, determine whether opening of above-mentioned switch portion Q11.
When the gate of above-mentioned switch portion Q11 terminal has been imported low (Low) signal that above-mentioned switch control circuit 100 sends, open above-mentioned switch portion Q11.
Moreover, input is that coil according to second to the 4th coil Ns11, Ns12 and Ns13 is than storing at the voltage of the above-mentioned first coil Np11, be stored in the voltage of the above-mentioned second coil Ns11 afterwards, by the first diode D11 rectification, and by the level and smooth back output of the second capacitor C12 first voltage Vo11.
The voltage that is stored in above-mentioned tertiary coil Ns12 is to be exported the second voltage Vo2 by the second diode D12 and the 3rd capacitor C13 by rectification and level and smooth back.
The voltage that is stored in above-mentioned the 4th coil Ns13 is to be exported tertiary voltage Vo3 by the 3rd diode D13 and the 4th capacitor C14 by rectification and level and smooth back.
Here, above-mentioned pulse voltage control part 200 is above-mentioned tertiary coil Ns12 and the 4th coil Ns13, and the above-mentioned second coil Ns11 ground wire terminal tie together after through above-mentioned inductor 201 back ground connection.
Then, from the secondary coil of the above-mentioned first transformer T11 one draws switching signal and is input to above-mentioned delay loop 202, delays generating the signal Vds that drives above-mentioned switch loop behind the certain hour td, carries out saturated at each to above-mentioned inductor 201.
Below, the voltage oscillogram during with reference to 4 couples in figure above-mentioned switch portion Q11 of the present invention describes;
In the moment that above-mentioned switch portion Q11 opens, because above-mentioned inductor 201, td can not flow in the electric current certain hour of output, thus the voltage that can not flyback, and only flow into direct voltage at above-mentioned switch portion Q11, and pulse voltage can suppress the initial stage overvoltage.
After having postponed above-mentioned certain hour td, when saturated above-mentioned inductor 201 connects electric current, the voltage that flybacks can flow on the switch terminal, but be in pulse voltage and be reduced to very low state this moment, so the voltage of above-mentioned switch portion Q11 can not rise again, only remaining flyback voltage Vfb and input voltage VIN dc's (VIDC) is synthetic.
The output input oscillogram of the above-mentioned pulse voltage control part 200 of power control of the present invention is described below with reference to Fig. 5.
At first, the voltage Vs input that stores by the secondary tertiary coil Ns12 as the above-mentioned first transformer T11 of Fig. 5 a is when above-mentioned delay loop 202, and above-mentioned delay loop 202 can output have postponed the drive signal Vsd of certain hour td as Fig. 5 b.
Above-mentioned switch loop 203 is as Fig. 5 c (switch), according to the above-mentioned signal of delaying the drive signal Vsd output "on" and "off" of portion's 202 outputs.
When the signal of "on" and "off" had been exported in above-mentioned switch loop 203, the elementary inductance L sat of above-mentioned transformer (shown in Fig. 5 d) can export and the opposite signal of signal of the "on" and "off" that export in above-mentioned switch loop 203.
According to this signal,,, be imported into the anode of the above-mentioned first diode D11 as the form ID1 of Fig. 5 e from the primary coil Np11 of the above-mentioned first transformer T11 according to the electric current of the secondary second coil Ns11 voltage that is stored in the above-mentioned first transformer T11.
Thereupon, power control is when the moment of opening above-mentioned switch portion Q11 made in accordance with the present invention, by the above-mentioned first transformer T11 voltage of input is stored in secondaryly, output current 201 can not taken place by the moment inductor of above-mentioned pulse voltage control part 200 in the voltage that is stored in T11 time grade in above-mentioned first transformer this moment in certain hour td.
The operation embodiment of power control constructed in accordance is as shown in Figure 6, gives the numbering identical with Fig. 3 to the component part identical with Fig. 3.
The operation embodiment of power control is by forming with the lower part:
Input is stored in the first secondary transformer T11 at elementary voltage; Adjust the switch portion Q11 of the voltage storage of the above-mentioned first transformer T11; Control the switch control circuit 100 of above-mentioned switch portion Q11 "on" and "off"; Rectification is stored in the rectification part 300 of the secondary voltage of the above-mentioned first transformer T11; The partes glabra 400 of the voltage of level and smooth above-mentioned rectification part 300 rectifications; And, be connected the pulse voltage control part 210 of T11 level of above-mentioned first transformer institute allocation in order to suppress the pulse voltage of above-mentioned switch portion Q11.
Above-mentioned pulse voltage control part 210 is by forming as lower member:
Rectification is stored in the 4th diode D14 of voltage of the secondary tertiary coil Ns12 of the above-mentioned first transformer T11; Be connected and work the second transformer T12 that stores the commutating voltage function on the negative electrode of above-mentioned the 4th diode D14; The elementary end of the above-mentioned second transformer T12 connects the collector electrode of a transistor seconds Q12; End in the base stage of above-mentioned transistor seconds Q12 connects one the 5th a capacitor C15 and a resistance R 11; The other end ground connection of above-mentioned the 5th capacitor C15; The other end of above-mentioned resistance R 11 is connected the end that the above-mentioned second transformer T12 is connected with above-mentioned the 4th diode D14 negative electrode.Second of the secondary end of the above-mentioned second transformer T12 and the secondary coil of the above-mentioned first transformer T11 is connected the secondary other end ground connection of the above-mentioned second transformer T12 with the tie point of the 4th coil Ns11, Ns13.
Power control made in accordance with the present invention as top parts composition, be the main coil ground connection of the whole ground wire terminal of secondary coil second to the 4th coil Ns11, the Ns12 of the above-mentioned first transformer T11 and Ns13 by the above-mentioned second transformer T12 after secondary, stream is postponed certain hour td in the primary current of the above-mentioned second transformer T12 by above-mentioned resistance R 11 and the 5th capacitor C15, determine the "on" and "off" of transistor seconds Q12 with this.
So, the saturated above-mentioned second transformer T12 when opening above-mentioned transistor seconds Q12, after the second above-mentioned transformer T12 was saturated, the primary inductance Lsat of the above-mentioned second transformer T12 almost approached " 0 ", just can the proper flow output current.
Because the delay of such output current the voltage Vfb that flybacks can not occur in the moment of opening above-mentioned switch portion Q11, just can reduce the pulse voltage of switch portion Q11.
Those of ordinary skill in the art will be appreciated that, above embodiment is used for illustrating the present invention, and be not to be used as limitation of the invention, as long as in connotation scope of the present invention, all will drop in the scope of claims of the present invention variation, the modification of the above embodiment.
Claims (1)
1. power control is characterized in that described device comprises:
Input is stored in the first secondary transformer at elementary voltage, and this first transformer comprises that an end is connected first coil of first capacitor, and according to coil than being stored in secondary second, third, the 4th coil;
Adjust the switch portion of the stored voltage of described first transformer;
Control the switch control circuit of the "on" and "off" of described switch portion;
Rectification and the rectification part and the partes glabra that smoothly are stored in the voltage of described first transformer secondary output, described rectification part by be connected on respectively above-mentioned first transformer second, third, first, second, third triode of the 4th coil forms, described partes glabra by be connected on respectively first, second, third triode second, third, the 4th capacitor forms; And,
In order to suppress the pulse voltage of described switch portion, be connected the pulse voltage control part of described first transformer secondary output, described pulse voltage control part comprises following parts: rectification is stored in the 4th diode of voltage of the secondary tertiary coil of described transformer; Be connected the negative electrode of above-mentioned the 4th diode, store second transformer of the voltage of described the 4th diode rectification; An elementary end of described second transformer connects the collector electrode of a transistor seconds; One end of the base stage of described transistor seconds connects one the 5th capacitor and a resistance; An other end ground connection of above-mentioned the 5th capacitor; The other end of above-mentioned resistance is connected the end that second transformer is connected with above-mentioned the 4th diode cathode; Second of a secondary end of above-mentioned second transformer and the secondary coil of above-mentioned first transformer is connected the secondary other end ground connection of above-mentioned second transformer with the tie point of the 4th coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021450749A CN100403640C (en) | 2002-11-06 | 2002-11-06 | Electrical power control unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021450749A CN100403640C (en) | 2002-11-06 | 2002-11-06 | Electrical power control unit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1499705A CN1499705A (en) | 2004-05-26 |
| CN100403640C true CN100403640C (en) | 2008-07-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021450749A Expired - Fee Related CN100403640C (en) | 2002-11-06 | 2002-11-06 | Electrical power control unit |
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| CN (1) | CN100403640C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105096857B (en) * | 2015-07-24 | 2018-03-27 | 深圳市华星光电技术有限公司 | A kind of gate driving circuit and liquid crystal display |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08266049A (en) * | 1995-03-22 | 1996-10-11 | Sanken Electric Co Ltd | Switching power supply |
| JPH10248255A (en) * | 1997-02-28 | 1998-09-14 | Toshiba Lighting & Technol Corp | Power-supply apparatus |
| JP2000341941A (en) * | 1999-05-26 | 2000-12-08 | Fuji Elelctrochem Co Ltd | Switching power supply |
-
2002
- 2002-11-06 CN CNB021450749A patent/CN100403640C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08266049A (en) * | 1995-03-22 | 1996-10-11 | Sanken Electric Co Ltd | Switching power supply |
| JPH10248255A (en) * | 1997-02-28 | 1998-09-14 | Toshiba Lighting & Technol Corp | Power-supply apparatus |
| JP2000341941A (en) * | 1999-05-26 | 2000-12-08 | Fuji Elelctrochem Co Ltd | Switching power supply |
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| Publication number | Publication date |
|---|---|
| CN1499705A (en) | 2004-05-26 |
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