CN201699600U - AC-DC regulated power supply - Google Patents
AC-DC regulated power supply Download PDFInfo
- Publication number
- CN201699600U CN201699600U CN2009201772579U CN200920177257U CN201699600U CN 201699600 U CN201699600 U CN 201699600U CN 2009201772579 U CN2009201772579 U CN 2009201772579U CN 200920177257 U CN200920177257 U CN 200920177257U CN 201699600 U CN201699600 U CN 201699600U
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- voltage
- power supply
- switch element
- bridge rectifier
- bridge
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Abstract
An AC-DC regulated power supply comprises a bridge-type rectifier, a switch element, a capacitor and a voltage detection and control circuit. The AC-DC regulated power supply is characterized in that alternate current is connected with two AC input terminals of the bridge-type rectifier; the switch element and the capacitor are connected in series between the positive terminal and the negative terminal of the bridge-type rectifier; the input terminal of the voltage detection and control circuit is connected with the positive terminal of the bridge-type rectifier; the negative terminal of the voltage detection and control circuit is connected with the negative terminal of the bridge-type rectifier; the control terminal of the voltage detection and control circuit is connected with the control terminal of the switch element; and two DC output terminals are connected with two ends of the capacitor. The AC-DC regulated power supply has the characteristics of simple structure, small high-frequency interference and high efficiency.
Description
Affiliated technical field
The utility model relates to a kind of interchange changes D.C. regulated power supply.
Background technology
Direct current regulation circuit is changeed in the interchange of present known mains frequency, be converted to direct current by exchanging by bridge rectifier, adopt the dual mode voltage stabilizing after becoming more stable direct current through capacitor filtering, a kind of is to produce the electronic switching element of pwm signal modulation string on current supply circuit by oscillating circuit, through finishing lowering and stabilizing blood pressure after the inductance capacitance energy storage filtering, there is complex structure in this voltage regulating mode, the problem that electromagnetic interference is bigger, another kind comes lowering and stabilizing blood pressure by being modulated at the electronic variable impedance of connecting on the current supply circuit, this voltage regulating mode exists efficient low, the big problem of generating heat.Thereby above dual mode voltage detecting circuit all is to detect switch or the electronic variable impedance realization voltage stabilizing that output voltage is adjusted electronic component.
Summary of the invention
Change DC decompression voltage stabilizing circuit complex structure in order to overcome existing interchange, the high-frequency electromagnetic interference ratio is bigger, or efficient is low, the big problem of generating heat, the utility model provide a kind of interchange to change the DC decompression voltage stabilizing circuit, and this circuit structure is simple, high-frequency electromagnetic disturbs little, the efficient height.
The technical scheme that its technical problem that solves the utility model adopts is: the alternating current of mains frequency is connected the interchange input two ends of bridge rectifier, switch element and capacitors in series are connected between the anode and negative terminal of bridge rectifier, the input of voltage detecting and controling circuit is connected the anode of bridge rectifier, the negative pole end of voltage detecting and controling circuit is connected the bridge rectifier negative terminal, the control end of voltage detecting and controling circuit is connected the control end of switch element, and the electric capacity two ends are connecting the two ends of output DC.
The alternating current of input has been exported the direct current of a non-filtered through the bridge rectifier rectification, and this galvanic amplitude is the just profound half-wave voltage that changes with ac period.The input of voltage detecting and controling circuit is monitored this galvanic amplitude in real time, when this galvanic amplitude when being lower than the voltage of our demand, voltage detecting and controling circuit system end output opening signal makes the switch element conducting, charges to load and while electric capacity with power supply.When this galvanic amplitude when being higher than the voltage of our demand, voltage detecting and controling circuit control end output shutdown signal disconnects switch element, at this moment continues powering load by capacitor discharge, has so just realized interior step-down and the voltage regulation result of certain limit.
The beneficial effects of the utility model, because of voltage detecting and controling circuit is that the positive and negative two ends of detecting bridge rectifier change the switch that voltage comes the control switch element, the direct current amplitude period of change of switching frequency and bridge rectifier output is synchronous, switching frequency is low, and switch element is on off state, and loss is low, there are not high-frequency oscillator and inductance element, so simple in structure, High-frequency Interference is little, the efficient height.
Description of drawings
Below in conjunction with drawings and Examples the utility model is further specified.
Accompanying drawing is a kind of enforcement circuit diagram of the present utility model.
Embodiment
In the accompanying drawing illustrated embodiment, D1 D2 D3 D4 is four diodes, and they form a bridge rectifier, as when the 100V peak value, and the direct current that has just become the amplitude of 100HZ to change after the AC rectification of 50HZ from 0 to 100V cycle.IC1 R1 R2 R3 D6 forms voltage detecting and controling circuit, IC1 is the integrated circuit of built-in reference voltage and comparator, the R pin of IC1 is to detect the voltage input pin, the A pin is the lower margin of IC1, the C pin is the control output pin of IC1, the function of IC1 is that the C pin is with regard to output low level when R pin input voltage is higher than inner reference voltage, and it is that the integrated circuit of TL431 meets this function that model is arranged at present.R2 and R1 form a bleeder circuit, and R3 provides control end voltage, D5 be voltage stabilizing didoe with restriction control end voltage, Q1 is a N-channel MOS pipe.C1 is a capacitor.The direct current that amplitude changes compares by R pin and the inner reference voltage that the R1R2 dividing potential drop is input to IC1, when R pin voltage during less than the reference voltage of inside IC1 C pin be high, drive the Q1 conducting, with power supply to load and simultaneously C1 charge.When R pin voltage during greater than the reference voltage of inside IC1 C pin be low, drive Q1 and close, at this moment continue powering load by the C1 discharge, so just realized interior step-down and the voltage regulation result of certain limit.The direct current of the frequency of Q1 switch and amplitude cycle variation is synchronous like this, far below the frequency more than the 20K of high frequency switch power.
Withstand voltage and the current value that can select Q1 according to the input voltage and the output current of power supply, detect drive circuit and can replace usefulness with the circuit of other same functions, C1 can come the selection capacity according to the electric current of loading demand and the voltage fluctuation of permission, the withstand voltage output voltage that is greater than at least.The ratio of adjusting R1R2 just can be adjusted the size of output voltage.
Claims (1)
1. one kind exchanges the commentaries on classics D.C. regulated power supply, comprise bridge rectifier, switch element, capacitor, voltage detecting and controling circuit, it is characterized in that: alternating current is connected the interchange input two ends of bridge rectifier, switch element and capacitors in series are connected between the anode and negative terminal of bridge rectifier, the input of voltage detecting and controling circuit is connected the anode of bridge rectifier, the negative pole end of voltage detecting and controling circuit is connected the bridge rectifier negative terminal, the control end of voltage detecting and controling circuit is connected the control end of switch element, and the two ends of output DC are connected the capacitor two ends.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201772579U CN201699600U (en) | 2009-08-24 | 2009-08-24 | AC-DC regulated power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201772579U CN201699600U (en) | 2009-08-24 | 2009-08-24 | AC-DC regulated power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201699600U true CN201699600U (en) | 2011-01-05 |
Family
ID=43400845
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009201772579U Expired - Fee Related CN201699600U (en) | 2009-08-24 | 2009-08-24 | AC-DC regulated power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201699600U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104022639A (en) * | 2013-02-28 | 2014-09-03 | 林万炯 | Micro control unit power supplying circuit |
| CN113765387A (en) * | 2020-06-02 | 2021-12-07 | 上海芯熠微电子有限公司 | Method and apparatus for broadening voltage range of AC-DC converter |
-
2009
- 2009-08-24 CN CN2009201772579U patent/CN201699600U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104022639A (en) * | 2013-02-28 | 2014-09-03 | 林万炯 | Micro control unit power supplying circuit |
| CN113765387A (en) * | 2020-06-02 | 2021-12-07 | 上海芯熠微电子有限公司 | Method and apparatus for broadening voltage range of AC-DC converter |
| CN113765387B (en) * | 2020-06-02 | 2024-04-26 | 上海芯熠微电子有限公司 | Method and device for widening voltage range of alternating current-direct current converter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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: 20110105 Termination date: 20120824 |