CN2783625Y - Small inductance boosting type DC converter - Google Patents
Small inductance boosting type DC converter Download PDFInfo
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- CN2783625Y CN2783625Y CN 200520041251 CN200520041251U CN2783625Y CN 2783625 Y CN2783625 Y CN 2783625Y CN 200520041251 CN200520041251 CN 200520041251 CN 200520041251 U CN200520041251 U CN 200520041251U CN 2783625 Y CN2783625 Y CN 2783625Y
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Abstract
A small inductance step-up DC converter is prepared as using multivibrator to generate square-wave signal with adjustable frequency and duty ratio to drive switch transistor to be switched on and off, connecting inductance current in collector loop of transistor in series to make relevant change along with switching on and off of transistor, generating instantaneous high voltage at one end of inductance when switching on and off according to self-inductance effect, obtaining stable high voltage and small current output by rectification and filtering. The utility model discloses be fit for providing the biasing high pressure for portable equipment, the advantage is light in weight, small.
Description
Technical field
The utility model relates to DC converter, and the small inductance boost type DC converter of the little electric current output of particularly a kind of high voltage is applicable to electrooptical device in the small portable product, transducer biasing circuit and avalanche photodide detector.
Background technology
Along with the development of microelectric technique, electronic equipment improves to integrated, portable and digitlization direction, thereby requires more and more miniaturization and the low-power consumption of module in the system.Therefore, except stability, reliability, high efficiency, miniaturization and lightweight also are very urgent demands in the specification requirement that electronic system proposes supply unit.
At present a lot of electronic systems are all directly with battery or only by a kind of basic voltage power supply, but many detectors, transducer and module all need than the high a lot of bias voltage of basic voltage, simple three end line pressurizers can't meet the demands, and have only the booster switcher of employing power supply.But traditional booster switcher power supply design circuit complexity, bulky, oneself power consumption and weight are all bigger, can't use in the strict portable product of volume, weight and power consumption.Though it is very little, very light that existing integrated-type boost type DC/DC converter can be accomplished on volume and weight, output voltage is difficult to reach the required high pressure of general biasing circuit.
Formerly boost type DC in the technology/DC converting method normally utilizes oscillator to direct current signal copped wave, rectification again, filtering produce dc high voltage output after the step-up transformer transformation then, its circuit theory as shown in Figure 1, utilize 555 integrated timers to constitute square-wave generator, square-wave signal driving switch triode VT overturns in conducting or by between two states, thereby driving transformer T work, after the output process diode VD rectification of transformer, the output high direct voltage.Be generally the high pressure that needing to obtain and exported, also will do voltage multiplying rectifier with electric capacity.This method is owing to use transformer as boosting element, and its volume and weight can not be accomplished very little.
Also having a kind of DC converting method is pulse width modulation (PWM) switch converters that extensively adopts at present, by the high frequency power switch to input direct voltage copped wave, utilize energy-storage travelling wave tubes such as electric capacity, inductance, obtain the energy of separation from input voltage source, temporarily energy is stored in the inductor with field form, or be stored in the capacitor with the electric field form, then with power conversion to load, realize the DC/DC conversion.Adopt the duty factor of PWM technology by output FEEDBACK CONTROL switching pulse, regulated output voltage is by improving the physical size that switching frequency can reduce energy-storage travelling wave tube.Stability is high, efficient is high because of having for switch converters, positive-negative polarity and ascending, descending flexibly presses the characteristics of mode to enjoy people's favor, but its circuit relative complex, during as booster converter, energy-storage travelling wave tube or transformer and complicated circuit will make miniaturization be restricted.Have again a kind of be with power switch, integrate with leg speed stream device and control circuit, energy storage inductor and I/O filter capacitor are external, thereby volume and weight is reduced greatly, but the output voltage of this series products still can not reach requirement in some occasion at present.
In a word, formerly boost type DC in the technology/DC converting method has been owing to adopted step-up transformer, multiplication of voltage electric capacity, elements such as storage capacitor, inductance, and the weight and volume of transformer is bigger.And often can not provide higher output voltage with the method that control circuit integrates.
Summary of the invention
The technical problems to be solved in the utility model is to overcome the deficiency of above-mentioned technology formerly, and a kind of small inductance boost type DC converter is provided, and to realize high pressure, the output of little electric current, has advantage in light weight, that volume is little simultaneously.
Basic principle of the present utility model is to produce switching signal by square-wave generator, utilizes the self-induction characteristic of inductance element to produce high-voltage pulse, again through over commutation, the required high direct voltage of filtering output.
Technical solution of the present utility model is as follows:
A kind of small inductance boost type DC converter, adopt 555 integrated timers as square-wave generator, first resistance and second resistance are connected on respectively between the 6th pin of 555 integrated timers and the 7th pin and between the 7th pin and the power supply, the node of the 6th pin of this 555 integrated timer and the 2nd pin and second resistance is by first capacity earth, the 1st pin ground connection, the 5th pin passes through capacity earth, the the 4th and the 8th pin connects power supply, the 3rd pin connects the control utmost point of switch triode, the collector electrode of this switch triode connects power supply by a stepup transformer, the grounded emitter of this switch triode is characterized in that described first resistance and second resistance are adjustable resistance; Described stepup transformer is a boost inductance, the node of the collector electrode of this boost inductance and this switch triode links to each other with the positive pole of a rectifier diode, the negative pole of this rectifier diode passes through high-voltage filtering capacitor ground connection again, and the negative pole of this rectifier diode and the node of high-voltage filtering capacitor are made the output of high direct voltage.
Described switch triode employing withstand voltage height, the high-speed switch triode MMBAT42 that saturated tube voltage drop is low help reducing power consumption.
Described boost inductance 3 should adopt as far as possible that volume is little, inductance value and the bigger inductance of saturation current.
Described high-voltage filtering capacitor is the polarity free capacitor of withstand voltage greater than 300V.
Advantage of the present utility model and characteristics are:
(1) the utility model square-wave generator frequency and duty ratio are utilized the adjustment of first variable resistor and the second adjustable resistance and adjustable, thereby realize that the output voltage wide region is adjustable.
(2) the utility model adopts boost inductance directly to boost, the conversion efficiency height, and volume and weight reduces significantly.
(3) the utility model volume is little, in light weight.
Description of drawings
Fig. 1 is boost type DC transform method circuit theory diagrams in the technology formerly
Fig. 2 is the circuit theory diagrams of a kind of inductance boost type DC converter specific embodiment of the utility model
Embodiment
See also Fig. 2, Fig. 2 is the circuit theory diagrams of the utility model inductance boost type DC converter specific embodiment.As seen from the figure, the utility model small inductance boost type DC converter, adopt 555 integrated timers as square-wave generator, first resistance R 1 and second resistance R 2 are connected on respectively between 555 the 6th pin and the 7th pin and between the 7th pin and the power Vcc, the node of the 6th pin of this 555 integrated timer and the 2nd pin and second resistance R 2 is by first capacitor C, 1 ground connection, the 1st pin ground connection, the 5th pin is by second capacitor C, 2 ground connection, the the 4th and the 8th pin connects power Vcc, the 3rd pin connects the control utmost point of switch triode T, the collector electrode of this switch triode T connects power Vcc by a stepup transformer, the grounded emitter of this switch triode T is characterized in that described first resistance R 1 and second resistance R 2 are adjustable resistance; Described stepup transformer is boost inductance L, the node of the collector electrode of this boost inductance L and this switch triode T and the positive pole of a rectifier diode D join, the negative pole of this rectifier diode D passes through high-voltage filtering capacitor C3 ground connection again, and the negative pole of this rectifier diode D and the node of high-voltage filtering capacitor C3 are made the output of the utility model high direct voltage.
Described switch triode T employing withstand voltage height, the high-speed switch triode MMBAT42 that saturated tube voltage drop is low.The inductance value of described boost inductance L is 2.2MH.
Described high-voltage filtering capacitor C4 is the polarity free capacitor of withstand voltage greater than 300V.The equivalent serial resistance of filter capacitor is the principal element that causes output Wen Bo, also can influence conversion efficiency, should select the electric capacity of low equivalent serial resistance for use.
Constitute the square-wave generator of frequency and EDM Generator of Adjustable Duty Ratio by 555 integrated timers and adjustable resistance R1, R2, through dividing potential drop rear drive switch triode T, when input high level, triode T conducting is connected in the boost inductance L charging in the collector loop, when low level arrives, triode T ends, and this moment is because the self inductance effect of boost inductance L produces high-voltage pulse, give output filter capacitor C4 charging by fast recovery rectifier diode D, produce high pressure, little current DC output Vout.
In sum, the utility model inductance boost type DC converter has the advantage that volume is little, in light weight, conversion efficiency is high and the little electric current output of high voltage can be provided.
Claims (4)
1, a kind of small inductance boost type DC converter, adopt 555 integrated timers as square-wave generator (1), first resistance (R1) and second resistance (R2) are connected on respectively between 555 the 6th pin and the 7th pin and between the 7th pin and the power supply (Vcc), the node of the 6th pin of this 555 integrated timer and the 2nd pin and second resistance (R2) is by first electric capacity (C1) ground connection, the 1st pin ground connection, the 5th pin is by second electric capacity (C2) ground connection, the the 4th and the 8th pin connects power supply (Vcc), the 3rd pin connects the control utmost point of switch triode (T), the collector electrode of this switch triode (T) connects power supply (Vcc) by a stepup transformer, the grounded emitter of this switch triode (T) is characterized in that described first resistance (R1) and second resistance (R2) are adjustable resistance; Described stepup transformer is boost inductance (L), the node of this boost inductance (L) and the collector electrode of this switch triode (T) links to each other with the positive pole of rectifier diode (D), the negative pole of this rectifier diode (D) passes through a high-voltage filtering capacitor (C3) ground connection again, and the node of negative pole of this rectifier diode (D) and high-voltage filtering capacitor (C3) is made the output of high direct voltage.
2, small inductance boost type DC converter according to claim 1 is characterized in that described switch triode (T) employing withstand voltage height, the high-speed switch triode MMBAT42 that saturated tube voltage drop is low.
3, small inductance boost type DC converter according to claim 1, the inductance value that it is characterized in that described boost inductance (L) is 2.2MH.
4,, it is characterized in that described high-voltage filtering capacitor (C3) is the polarity free capacitor of withstand voltage greater than 300V according to each described small inductance boost type DC converter of claim 1 to 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520041251 CN2783625Y (en) | 2005-04-29 | 2005-04-29 | Small inductance boosting type DC converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520041251 CN2783625Y (en) | 2005-04-29 | 2005-04-29 | Small inductance boosting type DC converter |
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| Publication Number | Publication Date |
|---|---|
| CN2783625Y true CN2783625Y (en) | 2006-05-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 200520041251 Expired - Fee Related CN2783625Y (en) | 2005-04-29 | 2005-04-29 | Small inductance boosting type DC converter |
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| CN (1) | CN2783625Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102664521A (en) * | 2012-05-02 | 2012-09-12 | 洪珍 | Direct current (DC) boosted circuit made from time base circuit |
| CN107688122A (en) * | 2017-09-28 | 2018-02-13 | 武汉博泰电力自动化设备有限责任公司 | A kind of circuit resistance tester |
-
2005
- 2005-04-29 CN CN 200520041251 patent/CN2783625Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102664521A (en) * | 2012-05-02 | 2012-09-12 | 洪珍 | Direct current (DC) boosted circuit made from time base circuit |
| CN107688122A (en) * | 2017-09-28 | 2018-02-13 | 武汉博泰电力自动化设备有限责任公司 | A kind of circuit resistance tester |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20060524 |