CN101997432A - Design method for low current output type photoelectric isolating alternating current/direct current voltage conversion circuit - Google Patents
Design method for low current output type photoelectric isolating alternating current/direct current voltage conversion circuit Download PDFInfo
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- CN101997432A CN101997432A CN2010105826397A CN201010582639A CN101997432A CN 101997432 A CN101997432 A CN 101997432A CN 2010105826397 A CN2010105826397 A CN 2010105826397A CN 201010582639 A CN201010582639 A CN 201010582639A CN 101997432 A CN101997432 A CN 101997432A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention relates to a direct current power supply, in particular to a design method for a low current output type photoelectric isolating alternating current/direct current (AC/DC) voltage conversion circuit. The design method is characterized in that: a rectifying circuit and a DC/DC conversion circuit are arranged in a shell, wherein a load circuit of the rectifying circuit is connected in series with a current limiting resistor R0 and a light emitting diode string; silicon photocell packs are arranged along the light emitting direction of the light emitting diode string; the voltage output ends of the silicon photocell packs are electrically connected with the input end of the DC/DC conversion circuit; the output end of the DC/DC conversion circuit is electrically connected with the DC/DC voltage output end of the shell; the silicon photocell packs are divided into a plurality of groups; the plurality of groups of silicon photocell packs are electrically connected with the input ends of a plurality of DC/DC conversion circuits respectively; and the output ends of the plurality of DC/DC conversion circuits are electrically connected with a plurality of DC/DC voltage output ends of the shell. The invention provides the design method for the low current output type photoelectric isolating alternating current/direct current (AC/DC) voltage conversion circuit which can convert 220V alternating current into direct current without a transformer.
Description
Technical field
The present invention relates to a kind of DC power supply, particularly a kind ofly convert the 220V alternating current to galvanic a kind of little current-output type photoelectricity isolated form combined-voltage design of switching circuit method without transformer.
Background technology
In electronic equipment, the required power supply of electronic device is many to be to convert to galvanicly by the 220V alternating current, and this transfer process has by transformer finishes the conversion of high pressure to low pressure, converts into low-voltage alternating-current to stream again.The switching power circuit of employing pattern is also arranged, and is that its volume of which kind of form all is must be bigger.It all needs transformer, and the transformer of Switching Power Supply is smaller.
Summary of the invention
The purpose of this invention is to provide a kind of transformer that do not need and convert the 220V alternating current to galvanic a kind of little current-output type photoelectricity isolated form combined-voltage design of switching circuit method.
The object of the present invention is achieved like this, a kind of little current-output type photoelectricity isolated form combined-voltage design of switching circuit method, it is characterized in that: rectification circuit and DC/DC change-over circuit are arranged in housing, the load circuit of rectification circuit is serially connected with current-limiting resistance R0 and light emitting diode string, the silicon photocell group is arranged on the light emission direction of light emitting diode string, the voltage output end of silicon photocell group is electrically connected with the input of DC/DC change-over circuit, and the output of DC/DC change-over circuit is electrically connected with the DC/DC voltage output end of housing; The silicon photocell component becomes many groups, is divided into many group silicon photocell groups and is electrically connected with the input of a plurality of DC/DC change-over circuits respectively; The output of a plurality of DC/DC change-over circuits is electrically connected with a plurality of DC/DC voltage output ends of housing; The rectifier diode of rectification circuit is a light-emitting diode.
The light emitting diode string number of the load circuit serial connection of described rectification circuit is according to the output current and the voltage parameter decision of DC/DC change-over circuit.
The rectifier diode of described rectification circuit is a light-emitting diode.
Described rectification circuit is bridge rectifier or semibridge system rectification circuit.
Advantage of the present invention is: owing to constitute the AC/DC change-over circuit by photoelectricity coupling circuit, a DC/DC change-over circuit, the diode of the rectification circuit of the input of photoelectricity coupling circuit is a light-emitting diode, the output circuit of photoelectricity coupling circuit is a silicon photocell, that is to say by the 220V alternating current is changeed the driven for emitting lights diode, by silicon photocell transform light energy is become electric energy, by the DC/DC change-over circuit voltage of silicon photocell is being changed into the direct current of needs at last.Direct current is to isolate fully with the 220V alternating current, therefore has the advantage that body is slight, reliability is high, anti-interference is good.
Description of drawings
The invention will be further described below in conjunction with the embodiment accompanying drawing:
Fig. 1 is principle of the invention figure;
Fig. 2 is the embodiment of the invention 1 structural representation;
Fig. 3 is the embodiment of the invention 2 structural representations.
Among the figure, 1, bridge rectifier; 2, DC/DC change-over circuit; 3, rectification circuit; 4, silicon photocell group; 5, housing; 6, light emitting diode string; 7, DC/DC voltage output end; 8, load circuit.
Embodiment
As shown in Figure 1, rectification circuit 3 and DC/DC change-over circuit 2 are arranged in housing 5, the rectifier diode of rectification circuit 3 is light-emitting diodes, the load circuit 8 of rectification circuit 3 is serially connected with current-limiting resistance R0 and light emitting diode string 6, silicon photocell group 4 is arranged on the light emission direction of light emitting diode string 6, the voltage output end of silicon photocell group 4 is electrically connected with the input of DC/DC change-over circuit 2, and the output of DC/DC change-over circuit 2 is electrically connected with the DC/DC voltage output end 7 of housing 5.Rectification circuit 3 is bridge rectifiers 1, and light emitting diode string 6 numbers of load circuit 8 serial connections of bridge rectifier 1 are according to the output current and the voltage parameter decision of DC/DC change-over circuit 2.
As shown in Figure 2, rectification circuit 3 and DC/DC change-over circuit 2 are arranged in housing 5, the load circuit 8 of rectification circuit is serially connected with current-limiting resistance and light emitting diode string 6, silicon photocell group 4 is arranged on the light emission direction of light emitting diode string 6, the voltage output end of silicon photocell group 4 is electrically connected with the input of DC/DC change-over circuit 2, and the output of DC/DC change-over circuit 2 is electrically connected with the DC/DC voltage output end 7 of housing 5.Rectification circuit 3 is bridge rectifiers 1, the number of the light emitting diode string 6 of load circuit 8 serial connections of bridge rectifier 1 is to determine according to DC/DC output current and voltage, embodiment 2 is common rectification two utmost points with the rectifier diode that is not both rectification circuit 3 of embodiment 1, as 1N4001,1N4007 or the like.
As shown in Figure 3, rectification circuit 3 and DC/DC change-over circuit 2 are arranged in housing 5, the load circuit 8 of rectification circuit is serially connected with current-limiting resistance and light emitting diode string 6, silicon photocell group 4 is arranged on the light emission direction of light emitting diode string 6, silicon photocell group 4 is divided into many groups, being divided into many group silicon photocell groups 4 is electrically connected with the input of a plurality of DC/DC change-over circuits 2 respectively, the output of a plurality of DC/DC change-over circuits 2 is electrically connected with a plurality of DC/DC voltage output ends of housing 5, and a plurality of DC/DC voltage output end electricity altogether.Rectification circuit 3 is bridge rectifiers, and the light-emitting diode number of load circuit 8 serial connections of bridge rectifier is determined according to DC/DC output current and voltage.
As shown in Figure 3, rectification circuit 3 and DC/DC change-over circuit 2 are arranged in housing 5, the load circuit 8 of rectification circuit is serially connected with current-limiting resistance and light emitting diode string 6, silicon photocell group 4 is arranged on the light emission direction of light emitting diode string 6, silicon photocell group 4 is divided into many groups, being divided into many group silicon photocell groups 4 is electrically connected with the input of a plurality of DC/DC change-over circuits 2 respectively, the output of a plurality of DC/DC change-over circuits 2 is electrically connected with a plurality of DC/DC voltage output ends of housing 5, and a plurality of DC/DC voltage output end electricity are not altogether.Rectification circuit 3 is bridge rectifiers, and the light-emitting diode number of load circuit 8 serial connections of bridge rectifier is determined according to DC/DC output current and voltage.
Claims (3)
1. little current-output type photoelectricity isolated form combined-voltage design of switching circuit method, it is characterized in that: rectification circuit and DC/DC change-over circuit are arranged in housing, the load circuit of rectification circuit is serially connected with current-limiting resistance R0 and light emitting diode string, the silicon photocell group is arranged on the light emission direction of light emitting diode string, the voltage output end of silicon photocell group is electrically connected with the input of DC/DC change-over circuit, and the output of DC/DC change-over circuit is electrically connected with the DC/DC voltage output end of housing; The silicon photocell component becomes many groups, is divided into many group silicon photocell groups and is electrically connected with the input of a plurality of DC/DC change-over circuits respectively; The output of a plurality of DC/DC change-over circuits is electrically connected with a plurality of DC/DC voltage output ends of housing; The rectifier diode of rectification circuit is a light-emitting diode.
2. little current-output type photoelectricity isolated form combined-voltage design of switching circuit method according to claim 1 is characterized in that: the light emitting diode string number of the load circuit serial connection of described rectification circuit is according to the output current and the voltage parameter decision of DC/DC change-over circuit.
3. little current-output type photoelectricity isolated form combined-voltage design of switching circuit method according to claim 1, it is characterized in that: described rectification circuit is bridge rectifier or semibridge system rectification circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105826397A CN101997432A (en) | 2010-12-10 | 2010-12-10 | Design method for low current output type photoelectric isolating alternating current/direct current voltage conversion circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105826397A CN101997432A (en) | 2010-12-10 | 2010-12-10 | Design method for low current output type photoelectric isolating alternating current/direct current voltage conversion circuit |
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| Publication Number | Publication Date |
|---|---|
| CN101997432A true CN101997432A (en) | 2011-03-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010105826397A Pending CN101997432A (en) | 2010-12-10 | 2010-12-10 | Design method for low current output type photoelectric isolating alternating current/direct current voltage conversion circuit |
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|---|---|
| CN (1) | CN101997432A (en) |
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2010
- 2010-12-10 CN CN2010105826397A patent/CN101997432A/en active Pending
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Application publication date: 20110330 |