CN101764526A - Switching mode power supply - Google Patents
Switching mode power supply Download PDFInfo
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- CN101764526A CN101764526A CN201010105698A CN201010105698A CN101764526A CN 101764526 A CN101764526 A CN 101764526A CN 201010105698 A CN201010105698 A CN 201010105698A CN 201010105698 A CN201010105698 A CN 201010105698A CN 101764526 A CN101764526 A CN 101764526A
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Abstract
The invention provides a switching mode power supply. In the power supply, two input ends of a bridge rectifier (Z) are connected with an alternating current power supply; the positive input end of the bridge rectifier (Z) is connected with an unidirection silicon controlled rectifier (SCR); a cathode of the unidirection silicon controlled rectifier (SCR) is the positive output end (V+) of a power supply; the negative output end of the bridge rectifier (Z) is the negative output end (V-) of the power supply; a filter capacitor (C) is connected in parallel between the positive output end (V+) and the negative output end (V-) of the power supply; a control electrode of the unidirection silicon controlled rectifier (SCR) is connected with the negative end of a voltage-regulator tube (DW); the positive end of the voltage-regulator tube (DW) is connected with the negative output end (V-) of the power supply; and a current limit resistor (R) is connected between the positive output end of the bridge rectifier (Z) and the negative end of the voltage-regulator tube (DW). The power supply has the advantages of low cost, high efficiency, small volume, convenient production and debugging, wide input voltage range and no high-frequency high-voltage pulse radiation, and is particularly applicable to driving power supply of various semiconductor lamps.
Description
Technical field
The present invention relates to a kind of switching power supply.
Background technology
Existing switching power supply is all complicated, cost is high, volume is big, working condition requires height, versatility is poor, very strong impulse disturbances is arranged.As positive and negative sharp formula switching power supply commonly used, wherein all include inductance element, therefore there is leakage field in the circuit, the high-voltage pulse of its generation impacts the impact that causes drive circuit and semiconductor light-emitting elements, and cause problems such as components and parts electric stresss such as switching tube are too high, the life-span and the reliability of electrical appliance, the power supply of especially uncomfortable cooperation Semiconductor light-emitting diode lamp will obviously be shortened.Though the stabilized voltage power supply that adopts controllable silicon and do not have inductance element is arranged at present, includes voltage sampling and comparison circuit, coupling circuit and circuits for triggering usually, circuit structure complexity, cost height.It as publication number 1057914 patent " thyristor voltage stabilized source ", must not only adopt voltage-stabiliser tube to do reference voltage but be used the electric resistance partial pressure sampling, adopt flip-flop circuit, adopt optocoupler or transformer relatively the triggering signal that produces of back deliver to controllable silicon, too complex.And for example publication number is the patent " one-way SCR AC voltage regulator " of CN101256419, uses complicated adjusting circuit, telemetry circuit, function circuit to constitute.Though indivedual thyristor voltage stabilized sources have been realized some simplification of circuit, can not be applicable to the differ greatly occasion of (as input 220V power supply output 12V voltage stabilizing direct current time) of input supply voltage and output direct voltage of voltage regulation value; When input voltage differs greatly with output direct voltage of voltage regulation value, must cooperate heavy huge ordinary silicon appendiron core transformer to use, thereby seriously limit its scope of application.
Summary of the invention
Purpose of the present invention just provides a kind of switching power supply, and this switching power supply cost is low, efficient is high, volume is little, produce debugging conveniently; Wide input voltage range, no hf and hv pulse radiation is particularly useful for the driving power of various semiconductor lamps.
The present invention realizes its goal of the invention, and the technical scheme that is adopted is, a kind of switching power supply, and its composition is:
Two inputs of bridge rectifier link to each other with AC power; The positive output end of bridge rectifier links to each other with the anode of one-way SCR, and the negative electrode of one-way SCR is the positive output end of power supply; The negative output terminal of bridge rectifier is the negative output terminal of power supply, and filter capacitor is connected in parallel between the positive and negative output of power supply;
The control utmost point of one-way SCR links to each other with the negative terminal of voltage-stabiliser tube, and the anode of voltage-stabiliser tube links to each other with the negative output terminal of power supply; Current-limiting resistance is connected between the negative terminal of the positive output end of bridge rectifier and voltage-stabiliser tube.
Operation principle of the present invention is:
Through the pulsating direct current that alternating current is exported behind bridge rectifier, the controllable silicon of leading up to charges to electric capacity, and powering load, and the current-limiting resistance of leading up to is powered to voltage stabilizing didoe, makes that the control voltage of the control utmost point of one-way SCR is fixed voltage.When the near zero-point voltage of pulsating direct current, controllable silicon automatically shuts down, and continues as electric by electric capacity; When the half-wave pulsating direct current is higher than the voltage of voltage-stabiliser tube and is higher than the electric capacity both end voltage, be forward voltage between the SCR control utmost point and negative electrode, the trigger current SCR control utmost point of flowing through is arranged, the controllable silicon conducting is to electric capacity charging and powering load; Equal voltage-stabiliser tube voltage when capacitance voltage is higher than, then the SCR control pole tension is a reverse voltage or for approaching zero, does not have electric current to flow through the control utmost point, i.e. triggerless electric current, and not conducting of controllable silicon, electric capacity is electric, and voltage descends to some extent.Above process constantly repeats, and makes that the voltage of output is stable within the specific limits, realizes voltage stabilizing function.
Compared with prior art, the invention has the beneficial effects as follows:
One, utilize and to be connected on the voltage stabilizing didoe of the SCR control utmost point and the voltage difference of filter capacitor is controlled voltage as silicon controlled, whether the control controllable silicon triggering and conducting, thus control output voltage, and need not any other triggering and circuit such as coupling; Connect a resistance between the controllable silicon positive pole and the control utmost point, both supplied with trigger current and also supplied with the voltage stabilizing didoe operating current, also limit the excessive damage controllable silicon of trigger current simultaneously, the realization circuit is simplified to greatest extent.All circuit only need be with repertoires such as several common separation elements, realization rectification that just can be complete, step-down, voltage stabilizing, filtering, make apparatus of the present invention simple in structure, volume is little, produce to debug and make things convenient for;
Two, owing to do not contain inductance element in the circuit, so magnetic leakage free, no hf and hv pulse radiation.Impact to drive circuit and semiconductor light-emitting elements is little, helps improving the life-span and the reliability of electrical appliance.
Three, the supply voltage scope of Shi Yonging is extremely wide, allows to import AC power or the pulsating direct current that is lower than the components and parts withstand voltage and is higher than any magnitude of voltage of output voltage; And the selection by voltage-stabiliser tube then can realize exporting the needed various voltage of voltage regulation of various electrical works easily.
Four, because Switching Power Supply of the present invention is little to the impact of semiconductor light-emitting elements, and its wide input voltage range, output voltage can conveniently be set, therefore it is luminous that it can cooperate to come high efficiency driving semiconductor lamp with the linear constant current circuit of simple and easy cheap reliably low pressure reduction, thereby especially be suitable for the driving power of various semiconductor lamps.
Go back differential concatenation between the tie point of the control utmost point of above-mentioned one-way SCR and current-limiting resistance and voltage-stabiliser tube negative terminal the protection diode is arranged.
The reverse voltage of the control utmost point of one-way SCR and negative electrode was too high when the protection diode can prevent work, avoided controllable silicon to puncture, and controllable silicon is played protection utilization.
The present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.
Description of drawings
Fig. 1 is the circuit diagram of the embodiment of the invention.
Embodiment
Embodiment
Fig. 1 illustrates, and a kind of embodiment of the present invention is: a kind of switching power supply, and its composition is:
Two inputs of bridge rectifier Z link to each other with AC power; The positive output end of bridge rectifier Z links to each other with the anode of unidirectional controllable silicon S CR, and the negative electrode of unidirectional controllable silicon S CR is the positive output end V+ of power supply; The negative output terminal of bridge rectifier Z is the negative output terminal V-of power supply, and filter capacitor C is connected in parallel between positive and negative output V+, the V-of power supply;
The control utmost point of unidirectional controllable silicon S CR links to each other with the negative terminal of voltage-stabiliser tube DW, and the anode of voltage-stabiliser tube DW links to each other with the negative output terminal V-of power supply; Current-limiting resistance R is connected between the negative terminal of the positive output end of bridge rectifier Z and voltage-stabiliser tube DW.
Go back differential concatenation between the tie point of the control utmost point of unidirectional controllable silicon S CR and current-limiting resistance R and voltage-stabiliser tube DW negative terminal protection diode D is arranged.
Claims (2)
1. switching power supply, its composition is:
Two inputs of bridge rectifier (Z) link to each other with AC power; The positive output end of bridge rectifier (Z) links to each other with the anode of one-way SCR (SCR), and the negative electrode of one-way SCR (SCR) is the positive output end (V+) of power supply; The negative output terminal of bridge rectifier (Z) is the negative output terminal (V-) of power supply, and filter capacitor (C) is connected in parallel between the positive and negative output (V+, V-) of power supply;
The control utmost point of one-way SCR (SCR) links to each other with the negative terminal of voltage-stabiliser tube (DW), and the anode of voltage-stabiliser tube (DW) links to each other with the negative output terminal (V-) of power supply; Current-limiting resistance (R) is connected between the negative terminal of the positive output end of bridge rectifier (Z) and voltage-stabiliser tube (DW).
2. a kind of switching power supply as claimed in claim 1 is characterized in that: going back differential concatenation between the tie point of the control utmost point of described one-way SCR (SCR) and current-limiting resistance (R) and voltage-stabiliser tube (DW) negative terminal has protection diode (D).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010105698A CN101764526A (en) | 2010-02-04 | 2010-02-04 | Switching mode power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010105698A CN101764526A (en) | 2010-02-04 | 2010-02-04 | Switching mode power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101764526A true CN101764526A (en) | 2010-06-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010105698A Pending CN101764526A (en) | 2010-02-04 | 2010-02-04 | Switching mode power supply |
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| CN (1) | CN101764526A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103696742A (en) * | 2013-11-26 | 2014-04-02 | 中国石油集团川庆钻探工程有限公司 | Ignition control circuit of downhole electric detonator for perforation |
| CN103701319A (en) * | 2013-11-26 | 2014-04-02 | 中国石油集团川庆钻探工程有限公司 | Wide-range inputting and voltage stabilizing power supply circuit for downhole perforation ignition control circuit |
-
2010
- 2010-02-04 CN CN201010105698A patent/CN101764526A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103696742A (en) * | 2013-11-26 | 2014-04-02 | 中国石油集团川庆钻探工程有限公司 | Ignition control circuit of downhole electric detonator for perforation |
| CN103701319A (en) * | 2013-11-26 | 2014-04-02 | 中国石油集团川庆钻探工程有限公司 | Wide-range inputting and voltage stabilizing power supply circuit for downhole perforation ignition control circuit |
| CN103701319B (en) * | 2013-11-26 | 2017-04-05 | 中国石油集团川庆钻探工程有限公司 | For the wide scope input voltage-stabilized power supply circuit of circuit for downhole perforation ignition control circuit |
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| PB01 | Publication | ||
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20100630 |