CN103117658A - Method and circuit of series control voltage fine controlling power source - Google Patents
Method and circuit of series control voltage fine controlling power source Download PDFInfo
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- CN103117658A CN103117658A CN2013100264471A CN201310026447A CN103117658A CN 103117658 A CN103117658 A CN 103117658A CN 2013100264471 A CN2013100264471 A CN 2013100264471A CN 201310026447 A CN201310026447 A CN 201310026447A CN 103117658 A CN103117658 A CN 103117658A
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Abstract
The invention relates to a method of series control voltage fine controlling a power source. The method is characterized of being suitable for a switch power source, and providing a shifting latch. Series transmission control signals are utilized to control the shifting latch to adjust access resistance values of a plurality of divider resistors at an output end of the switch power source so as to adjust output voltage of the switch power source. According to the method and the circuit, a concise low-cost scheme is adopted. The shifting latch is utilized to realize adjustment of the series signals on output voltage of the switch power source, and the method and the device have the advantages of being high in adjusting accuracy, stable in output voltage, and the like.
Description
Technical field
The present invention relates to power technique fields, particularly a kind of method and circuit of Serial Control voltage fine tuning power supply.
Background technology
Existing Switching Power Supply is because its stability is high, and circuit structure simply is widely used in all kinds of electric equipments, and wherein the Switching Power Supply of multichannel adjustable output voltage is all generally to realize by a plurality of voltage regulating modules being set at power output end or increasing tap at switching mode power supply transformer.Not only the high circuit structure of cost is complicated for it, and the voltage control precision is inaccurate.
In addition, in the LED light fixture, LED drive circuit is namely the Switching Power Supply of an output constant current, and it is with an automatic light meter that existing circuit often adopts controllable silicon dimmer to realize, it is poor stability not only, and does not possess versatility, and design cost is high.
Summary of the invention
In view of this, the purpose of this invention is to provide a kind of method of utilizing serial transmit control signal to come the by-pass cock electric power output voltage.
The method adopts following scheme to realize: a kind of method of Serial Control voltage fine tuning power supply, it is characterized in that: be applicable to Switching Power Supply, the method provides a displacement latch, utilize serial transmit control signal to control this displacement latch and regulate a plurality of divider resistances in the access resistance of this Switching Power Supply output, to regulate the output voltage of this Switching Power Supply.
In an embodiment of the present invention, described displacement latch also is provided with the ratio step-up/step-down circuit, in order to realize that output voltage is by rising or fall than row.
In an embodiment of the present invention, described displacement latch is 8 bit shift latchs.
In an embodiment of the present invention, described divider resistance is 8, is respectively 1/2 in low level to high-order resistance ratio
7, 1/2
6, 1/2
5, 1/2
4, 1/2
3, 1/2
2, 1/2,1 times.
In an embodiment of the present invention, described Switching Power Supply is a LED pipe driving power.
Another object of the present invention is to provide a circuit of realizing said method.
This circuit comprises a Switching Power Supply, characterized by further comprising:
One displacement latch, the feeder ear of this displacement latch is connected with the output of described Switching Power Supply;
A plurality of divider resistances, an end of these a plurality of resistance is connected to output corresponding to latch separately, and the other end is connected to the output of described Switching Power Supply and the Voltage Feedback input of this Switching Power Supply;
One basic divider resistance R1, the end of this basic divider resistance R1 is connected with the output of described Switching Power Supply;
One basic divider resistance R2, the end of this basic divider resistance R2 and the other end of described basic divider resistance R1 are connected to the Voltage Feedback input of described Switching Power Supply, the other end ground connection of described basic divider resistance R2; And
One controls data wire and clock line, controls described displacement latch in order to serial transmit control signal, regulates described a plurality of divider resistances in the access resistance of this Switching Power Supply output.
In an embodiment of the present invention, also comprise a ratio step-up/step-down circuit, this ratio step-up/step-down circuit is connected between described Switching Power Supply output and displacement latch feeder ear, in order to realize that output voltage is by rising or fall than row.
In an embodiment of the present invention, described displacement latch is 8 bit shift latchs.
In an embodiment of the present invention, described divider resistance is 8, is respectively 1/2 in low level to high-order resistance ratio
7, 1/2
6, 1/2
5, 1/2
4, 1/2
3, 1/2
2, 1/2,1 times.
In an embodiment of the present invention, described Switching Power Supply is a LED pipe driving power.
The inventive method and circuit adopt succinct lower cost solution, utilize the displacement latch to realize that serial signal regulates switch power source output voltage, have the characteristics such as degree of regulation is high, output voltage stabilization.
Description of drawings
Fig. 1 is the circuit catenation principle schematic diagram of the embodiment of the present invention.
Fig. 2 is the circuit catenation principle schematic diagram of another embodiment of the present invention.
Embodiment
The present invention will be further described below in conjunction with drawings and Examples.
The embodiment of the present invention provides a kind of method of Serial Control voltage fine tuning power supply, it is characterized in that: be applicable to Switching Power Supply, the method provides a displacement latch, utilize serial transmit control signal to control this displacement latch and regulate a plurality of divider resistances in the access resistance of this Switching Power Supply output, to regulate the output voltage of this Switching Power Supply.Described displacement latch also is provided with the ratio step-up/step-down circuit, in order to realize that output voltage is by rising or fall than row.
In an embodiment of the present invention, described displacement latch is 8 bit shift latchs.When this displacement latch was 8, described divider resistance was 8, was respectively 1/2 in low level to high-order resistance ratio
7, 1/2
6, 1/2
5, 1/2
4, 1/2
3, 1/2
2, 1/2,1 times.
Concrete, seeing also Fig. 1, Fig. 1 is the circuit catenation principle schematic diagram of the present embodiment, in figure, this circuit comprises a Switching Power Supply, characterized by further comprising:
One displacement latch, the feeder ear of this displacement latch is connected with the output of described Switching Power Supply;
A plurality of divider resistances 4, an end of these a plurality of resistance is connected to output corresponding to latch 3 separately, and the other end is connected to the output of described Switching Power Supply and the Voltage Feedback input of this Switching Power Supply;
One basic divider resistance R1, the end of this basic divider resistance R1 is connected with the output of described Switching Power Supply;
One basic divider resistance R2, the end of this basic divider resistance R2 and the other end of described basic divider resistance R1 are connected to the Voltage Feedback input of described Switching Power Supply, the other end ground connection of described basic divider resistance R2; And
One controls data wire 1 and clock line 2, controls described displacement latch in order to serial transmit control signal, regulates described a plurality of divider resistances in the access resistance of this Switching Power Supply output.
See also Fig. 2, the present embodiment is by the two-wire serial signal, when clock line 2 rising edges (or trailing edge) latch data wire 1 data into the displacement latch, displacement latch output pin 3 is exported respectively high level or low level through divider resistance 4 access Switching Power Supply major loop regulation output voltages.Better, in figure, to be basic divider resistance control as voltage range under limiting condition for resistance R 1, R2.For example: if the displacement latch is output as 8, when being output as 11111111 or 00000000, the ratio of this resistance R 1, R2 and divider resistance will determine minimum output voltage and maximum output voltage.
In the present embodiment, divider resistance can distribute by power, when for example being 8 bit shift latch, can be respectively 1/2 in low level to high-order resistance ratio
7, 1/2
6, 1/2
5, 1/2
4, 1/2
3, 1/2
2, 1/2,1 times.The voltage control precision can reach 2 like this
8Be 256 resolution.Can use with a plurality of displacement latch serial connections as improving precision.
Circuit of the present invention is specially adapted to LED pipe driving power, because of output voltage between 3V ~ 5V, output voltage V out directly can be connected on displacement latch VCC, in addition, better can also arrange a ratio step-up/step-down circuit between described Switching Power Supply output and displacement latch feeder ear, in order to realize that output voltage is by rising or fall than row; As output voltage＜3V or to adopt during 5V this than row step-up/step-down circuit with output voltage by rise or be down to 3V ~ 5V(displacement latch operating voltage than row).
It is worth mentioning that, the method and circuit can be applicable in various AC/DC or DC/DC circuit, switch power source output voltage be regulated control, particularly finely tune as the LED light tube electric voltage in the LED constant-current circuit, can play and optimize efficiency and the different LED tube coupling is pressed not Regulation Control simultaneously.
The above is only preferred embodiment of the present invention, and all equalizations of doing according to the present patent application the scope of the claims change and modify, and all should belong to covering scope of the present invention.
Claims (10)
1. the method for a Serial Control voltage fine tuning power supply, it is characterized in that: be applicable to Switching Power Supply, the method provides a displacement latch, utilize serial transmit control signal to control this displacement latch and regulate a plurality of divider resistances in the access resistance of this Switching Power Supply output, to regulate the output voltage of this Switching Power Supply.
2. the method for Serial Control voltage fine tuning power supply according to claim 1, it is characterized in that: described displacement latch also is provided with the ratio step-up/step-down circuit, in order to realize that output voltage is by rising or fall than row.
3. the method for Serial Control voltage fine tuning power supply according to claim 1, it is characterized in that: described displacement latch is 8 bit shift latchs.
4. the method for Serial Control voltage fine tuning power supply according to claim 3, it is characterized in that: described divider resistance is 8, is respectively 1/2 in low level to high-order resistance ratio
7, 1/2
6, 1/2
5, 1/2
4, 1/2
3, 1/2
2, 1/2,1 times.
5. the method for Serial Control voltage fine tuning power supply according to claim 1 is characterized in that: described Switching Power Supply is a LED pipe driving power.
6. the circuit of a Serial Control voltage fine tuning power supply, comprise a Switching Power Supply, characterized by further comprising:
One displacement latch, the feeder ear of this displacement latch is connected with the output of described Switching Power Supply;
A plurality of divider resistances, an end of these a plurality of resistance is connected to output corresponding to latch separately, and the other end is connected to the output of described Switching Power Supply and the Voltage Feedback input of this Switching Power Supply;
One basic divider resistance R1, the end of this basic divider resistance R1 is connected with the output of described Switching Power Supply;
One basic divider resistance R2, the end of this basic divider resistance R2 and the other end of described basic divider resistance R1 are connected to the Voltage Feedback input of described Switching Power Supply, the other end ground connection of described basic divider resistance R2; And
One controls data wire and clock line, controls described displacement latch in order to serial transmit control signal, regulates described a plurality of divider resistances in the access resistance of this Switching Power Supply output.
7. the circuit of Serial Control voltage fine tuning power supply according to claim 6, it is characterized in that: also comprise a ratio step-up/step-down circuit, this ratio step-up/step-down circuit is connected between described Switching Power Supply output and displacement latch feeder ear, in order to realize that output voltage is by rising or fall than row.
8. the circuit of Serial Control voltage fine tuning power supply according to claim 6, it is characterized in that: described displacement latch is 8 bit shift latchs.
9. the circuit of Serial Control voltage fine tuning power supply according to claim 8, it is characterized in that: described divider resistance is 8, is respectively 1/2 in low level to high-order resistance ratio
7, 1/2
6, 1/2
5, 1/2
4, 1/2
3, 1/2
2, 1/2,1 times.
10. the circuit of Serial Control voltage fine tuning power supply according to claim 6 is characterized in that: described Switching Power Supply is a LED pipe driving power.
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| CN201310026447.1A CN103117658B (en) | 2013-01-24 | 2013-01-24 | A kind of method of Serial Control voltage fine power supply and circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310026447.1A CN103117658B (en) | 2013-01-24 | 2013-01-24 | A kind of method of Serial Control voltage fine power supply and circuit |
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| CN103117658A true CN103117658A (en) | 2013-05-22 |
| CN103117658B CN103117658B (en) | 2015-10-28 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103702494A (en) * | 2014-01-09 | 2014-04-02 | 广德利德光电有限公司 | Two-pin RGB-LED (Red Green Blue-Light Emitting Diode) control circuit |
| CN109728721A (en) * | 2017-10-27 | 2019-05-07 | 北京嘉楠捷思信息技术有限公司 | Output voltage adjustable switching power supply and power supply system |
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| CN201130907Y (en) * | 2007-11-20 | 2008-10-08 | 至宝电脑兴业股份有限公司 | Power supply booster start circuit |
| CN101795062A (en) * | 2009-02-04 | 2010-08-04 | 恩益禧电子股份有限公司 | Booster circuit and display unit |
| CN101795071A (en) * | 2009-12-28 | 2010-08-04 | 福建星网锐捷网络有限公司 | DC-DC power supply device, voltage regulation method and network equipment |
| CN102064704A (en) * | 2010-12-27 | 2011-05-18 | 东莞市奇立电源有限公司 | Single-path multiple-voltage output power supply control method and device |
| CN201985759U (en) * | 2011-02-28 | 2011-09-21 | 广州视源电子科技有限公司 | DCDC (direct current direct current) output circuit |
| CN203056972U (en) * | 2013-01-24 | 2013-07-10 | 福州欣联达电子科技有限公司 | Circuit of serial control voltage accurately-adjusted power supply |
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2013
- 2013-01-24 CN CN201310026447.1A patent/CN103117658B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201130907Y (en) * | 2007-11-20 | 2008-10-08 | 至宝电脑兴业股份有限公司 | Power supply booster start circuit |
| CN101795062A (en) * | 2009-02-04 | 2010-08-04 | 恩益禧电子股份有限公司 | Booster circuit and display unit |
| CN101795071A (en) * | 2009-12-28 | 2010-08-04 | 福建星网锐捷网络有限公司 | DC-DC power supply device, voltage regulation method and network equipment |
| CN102064704A (en) * | 2010-12-27 | 2011-05-18 | 东莞市奇立电源有限公司 | Single-path multiple-voltage output power supply control method and device |
| CN201985759U (en) * | 2011-02-28 | 2011-09-21 | 广州视源电子科技有限公司 | DCDC (direct current direct current) output circuit |
| CN203056972U (en) * | 2013-01-24 | 2013-07-10 | 福州欣联达电子科技有限公司 | Circuit of serial control voltage accurately-adjusted power supply |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103702494A (en) * | 2014-01-09 | 2014-04-02 | 广德利德光电有限公司 | Two-pin RGB-LED (Red Green Blue-Light Emitting Diode) control circuit |
| CN109728721A (en) * | 2017-10-27 | 2019-05-07 | 北京嘉楠捷思信息技术有限公司 | Output voltage adjustable switching power supply and power supply system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103117658B (en) | 2015-10-28 |
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