CN101090240B - Device and method for converting voltage using switch mode - Google Patents
Device and method for converting voltage using switch mode Download PDFInfo
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- CN101090240B CN101090240B CN2006100612164A CN200610061216A CN101090240B CN 101090240 B CN101090240 B CN 101090240B CN 2006100612164 A CN2006100612164 A CN 2006100612164A CN 200610061216 A CN200610061216 A CN 200610061216A CN 101090240 B CN101090240 B CN 101090240B
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- power supply
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- induced potential
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Abstract
This invention relates to a device and a method for converting voltages by a switch mode, in which, the device includes a switch supply, an inductor, diodes and capacitors, and the inductor includes a primary coil and a secondary coil coupled to each other, both ends of the secondary coil are parallel to two branches with two diodes serial to capacitors to commutate and filter the positive and negative induced voltages to form a DC supply, which can be laminated to generate a voltage meeting the requirement.
Description
Technical field
The invention belongs to power supply change-over device and method, specifically, be based on Switching Power Supply obtains another accessory power supply by conversion device and method.
Background technology:
All to use power of alterating and direct current in the electronic equipment, particularly application integrated circuit has the equipment of Presentation Function simultaneously again, its power type is more, for example, existing 12V, 5V in the television set have 33V power supply etc. again, and wherein the 33V power supply aims at voltage synthesis type tuner (tuner) tuning voltage is provided, it is more special to require: power is little, and voltage is accurate and stable.Because its power is little, can not increase what burden to existing power supply, so, often all be to utilize existing power supply to change.In the past, in the CRT colour TV epoch, it was to obtain through the resistance step-down by the 130V high pressure in the television set.In panel TV, as the LCD colour TV, there has not been the 130V high pressure, have only 12V low pressure, at this time to obtain 33V voltage, also be to utilize existing 12V power supply, by the assembly that boosts the 12V elevate a turnable ladder is finished to 33V.
Point out that at this there are some deficiencies in this scheme: can increase cost on the one hand, not include its peripheral cell, only the price of an assembly (IC) is about 1 yuan at least; Do the complexity that also can improve circuit on the other hand like this, bring disagreeable interference simultaneously, influence the reliability of complete machine work, increase cost again and will overcome interference.Therefore improved necessity arranged very much.
Summary of the invention
The purpose of this invention is to provide a kind of with low cost, utilize the existing power supply of device interior to produce the apparatus and method of utilizing the on-off mode voltage of transformation of new boost voltage, this device and method provides a kind of new departure for utilizing low-tension supply to obtain high voltage source.
Another object of the present invention provides a kind of apparatus and method of utilizing the on-off mode voltage of transformation, and this device and method is that it makes full use of the existing power supply of device interior, only increases several elements seldom and just can obtain suitable voltage.
Based on this, the present invention is achieved in that
A kind of device that utilizes the on-off mode voltage of transformation, comprise Switching Power Supply, it is characterized in that in the major loop (Switching Power Supply loop) inductance being arranged, inductance has N1 and two (intercoupling) windings of N2, N1 is used for major loop, be connected in the major loop, N2 is used for the accessory power supply loop, and its two ends are connected in the accessory power supply loop.Winding N2 produces forward induced potential and negative sense induced potential by closing with the lotus root of winding N1.Winding N2 forward induced potential obtains a voltage U 1 by diode D2 rectification and through capacitor C 2 filtering, the negative sense induced potential of N2 obtains another voltage U 2 by the D3 rectification of another diode and through capacitor C 3 filtering, again the negative pole of the filter capacitor C3 of the negative induced potential anode with the input voltage of Switching Power Supply IC is tied, forms the power supply stack.
The stack of power supply, normally forward stack promptly forward is together in series between the power supply; Or the two-way power supply respectively with the stack of the input voltage of Switching Power Supply, or the three superposes jointly.
A kind of method of utilizing the on-off mode voltage of transformation comprises the steps:
1, on the inductance on the switch power supply output circuit, coupling coil is set, obtains induced potential;
2, respectively the positive and negative induced potential of above-mentioned coupling coil is carried out rectifying and wave-filtering, obtain the two-way DC power supply;
3, above-mentioned two-way DC power supply is used as DC power supply respectively.
In the above-mentioned step 3, or with the use that stacks up of above-mentioned two-way DC power supply, or the input voltage stack of above-mentioned two-way DC power supply and Switching Power Supply used, or the three superposes jointly;
The stack of above-mentioned power supply is forward to superpose, and promptly forward is together in series between the power supply.
According to the voltage that this method obtained, the number of turn that can also be by adjusting coupling coil is the height of regulation voltage recently.
This device is a kind of cheapness, practicality, simple and direct solution, in terms of existing technologies, has tangible cost advantage.It only increases several elements seldom on the basis of original Switching Power Supply just can obtain required voltage, and the value of these elements or several sharing money or a few mao, and cost is very cheap.
In addition, the input voltage that it will have Switching Power Supply now uses, and this brings very big benefit, and it has not only made full use of existing resource, more can effectively reduce the turn ratio of inductance, thereby reduce more because the electromagnetic interference that the number of turn of coil is brought and the waste of material etc. owing to this utilization.
Description of drawings
The typical circuit of Fig. 1 Switching Power Supply,
Fig. 2 circuit theory diagrams of the present invention.
Embodiment
Describe enforcement of the present invention in detail below in conjunction with accompanying drawing.
Generally all use the on-off mode reduction voltage circuit partly to power as digital circuit in the dull and stereotyped colour TV, Fig. 1 is the typical circuit of this scheme.It is by switch integrated circuit IC1, inductance L 1, sustained diode 1, formations such as output capacitance C1.Input voltage is Ui, and output voltage is Uo.
Its operation principle is such:
The conducting of feedback voltage control IC 1 internal switch and ending.
During switch conduction, supply voltage is added to output by inductance L 1, is electric, meanwhile also stored energy in the inductance L 1.
When switch ended, the energy storage of inductance L 1 continued to power to the load through sustained diode 1.
Feedback voltage has just determined conducting and the duty ratio of ending, by the adjusting maintenance output voltage stabilization of duty ratio.
The advantage of this power supply is with on-off mode work, the efficient height, and loss is little.The present invention increases several elements to obtain another different magnitude of voltage in addition on this circuit base, this different voltage can be arbitrary value within the specific limits, for example is used for tuning 33V voltage.
Lifting a most preferred embodiment below specifies the present invention.：
Please referring to Fig. 2.On outputting inductance L1, increase a winding N2, inductance winding originally is N1, the two intercouples, because the effect of mutual inductance, the voltage that is added on the N1 can produce corresponding induced potential on N2, forward induced potential on the N2 is by diode D2 rectification, and obtain a direct voltage U1 through capacitor C 2 filtering, the negative sense induced potential of N2 is by another diode D3 rectification, and obtain another direct voltage U2 through capacitor C 3 filtering, it is voltage after promoting that U1 and U2 and Ui forward connect superimposed, and its value is expressed by following formula
U＝U1+U2+Ui＝(Ui-Uo)*N2/N1+Uo*N2/N1+Ui＝Ui*(1+N2/N1)
By following formula as can be known,, needing just can obtain the magnitude of voltage of lifting as long as select suitable turn ratio N2/N1, very easy.For example input voltage 12V gets N2/N1=2, and output voltage just is 36V, follow-uply just can obtain 33V (herein omit) voltage by the simple parallel voltage-stabilizing of one-level again and is used for tuning for tuner.In like manner can conveniently obtain the power supply of other magnitudes of voltage.
Certainly, also can directly use U1 or U2, as long as regulate N2/N1 on demand.But, the problem that use to exist so points out in front, that be exactly the turn ratio too conference bring interference, and high material consumption, the inductance volume is big, does not more make full use of existing resource---on Ui is of no use.Therefore stack is used and is only preferred plan.
Claims (3)
1. device that utilizes the on-off mode voltage of transformation, comprise Switching Power Supply, it is characterized in that in the loop of Switching Power Supply, being provided with an inductance, inductance has N1 and two windings that intercouple of N2, winding N1 is connected in the loop of Switching Power Supply, and the two ends of winding N2 are connected in the accessory power supply loop; Winding N2 forward induced potential obtains a voltage U 1 by diode D2 rectification and through capacitor C 2 filtering, the negative sense induced potential of winding N2 obtains another voltage U 2 by the D3 rectification of another diode and through capacitor C 3 filtering, the negative pole of the filter capacitor C3 of the negative sense induced potential anode with the input voltage of Switching Power Supply is tied, forms the power supply stack.
2. a method of utilizing the on-off mode voltage of transformation is characterized in that this method comprises the steps:
A, on the inductance on the switch power supply output circuit, coupling coil is set, obtains induced potential;
B, the positive and negative induced potential to above-mentioned coupling coil carries out rectifying and wave-filtering respectively, obtains the two-way DC power supply;
C, above-mentioned two-way DC power supply is used as DC power supply respectively;
Or with the use that stacks up of above-mentioned two-way DC power supply, or above-mentioned two-way DC power supply used with the input voltage stack of Switching Power Supply respectively; Or the three superposes jointly; The stack of power supply is forward to superpose, and promptly forward is together in series between the power supply.
3. the method for utilizing the on-off mode voltage of transformation as claimed in claim 2, it is characterized in that can also be by adjusting coupling coil the number of turn height of regulation voltage recently.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006100612164A CN101090240B (en) | 2006-06-16 | 2006-06-16 | Device and method for converting voltage using switch mode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006100612164A CN101090240B (en) | 2006-06-16 | 2006-06-16 | Device and method for converting voltage using switch mode |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101090240A CN101090240A (en) | 2007-12-19 |
| CN101090240B true CN101090240B (en) | 2010-06-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2006100612164A Expired - Fee Related CN101090240B (en) | 2006-06-16 | 2006-06-16 | Device and method for converting voltage using switch mode |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1129226C (en) * | 1999-09-30 | 2003-11-26 | 索尼公司 | Switch power circuit and isolated variable transformer |
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2006
- 2006-06-16 CN CN2006100612164A patent/CN101090240B/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1129226C (en) * | 1999-09-30 | 2003-11-26 | 索尼公司 | Switch power circuit and isolated variable transformer |
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| CN101090240A (en) | 2007-12-19 |
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