CN201868933U - Control circuit for primary-side feedback constant-voltage current-limiting RCC charger - Google Patents
Control circuit for primary-side feedback constant-voltage current-limiting RCC charger Download PDFInfo
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- CN201868933U CN201868933U CN2010205906607U CN201020590660U CN201868933U CN 201868933 U CN201868933 U CN 201868933U CN 2010205906607 U CN2010205906607 U CN 2010205906607U CN 201020590660 U CN201020590660 U CN 201020590660U CN 201868933 U CN201868933 U CN 201868933U
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Abstract
The utility model provides a control circuit for a primary-side feedback constant-voltage current-limiting RCC (Ringing Choke Converter) charger. The control circuit comprises an AC input terminal, a DC output terminal, and a transformer with both a primary winding and a secondary winding, wherein the primary winding consists of a main winding and an auxiliary winding; the AC input terminal is connected with the primary winding; and the DC output terminal is connected with the secondary winding. Constant-voltage output is realized by directly utilizing a voltage stabilizing diode Z1, a resistor R7, an electrolytic capacitor C4, a rectifying diode D2 and the auxiliary winding of the transformer. Current limitation is realized by a resistor R3, a non-polar capacitor C3, a resistor R5, a triode Q2 and the auxiliary winding of the transformer. Meanwhile, in the utility model, the emitting electrode of a primary switch triode can be used for detecting whether the resistors are grounded or not without the need of current, the phenomenon that explosion of a switch tube is easily caused is avoided, and the conversion efficiency of the whole product is improved. The control circuit has the advantages of simplicity, low production and assembly costs, convenience in use and strong universality.
Description
Technical field
The utility model relates to a kind of circuit design of battery charger, relates to a kind of constant voltage and current limiting RCC charger control circuit that contains former limit feedback particularly.
Background technology
The constant voltage of general battery charger control circuit all is to utilize photoelectrical coupler to gather secondary voltage and current signal feedback to come the stable of control output voltage to elementary, the words of current limliting also need to increase other control circuit, and the complicated cost of The whole control line construction is higher like this.Just be to use integrated circuit to come the stable of control output voltage, but integrated circuit have the cost height, shortcomings such as antistatic effect difference.
The emitter of general RCC charger control circuit primary switch triode or the source electrode of field effect transistor all have a current sense resistor over the ground; this resistance is to be used for the operating current of sense switch pipe; the voltage at resistance two ends will raise when the operating current of switching tube is big, with this size (perhaps as overcurrent protection) as overpower protection control power output.This control mode detection speed is slow, causes the aircraft bombing phenomenon of switching tube explosion easily, because increased this current sense resistor, makes the conversion efficiency of entire product reduce greatly again, and cost also increases accordingly.
The utility model content
The utility model is the shortcoming that overcomes above-mentioned prior art, and the constant voltage and current limiting RCC charger control circuit of a kind of former limit feedback is provided.
The utility model realizes that the technical scheme that goal of the invention adopts is, the constant voltage and current limiting RCC charger control circuit of a kind of former limit feedback, comprise ac input end, dc output end, transformer with elementary winding and secondary winding, described elementary winding is made up of main winding and auxiliary winding, described ac input end connects elementary winding, described dc output end connects described secondary winding, it is characterized in that: the input of described main winding connects the live wire end of ac input end by insurance resistance R 1, the output of described main winding is connected with the collector electrode of a switch triode Q1, the zero line side of described ac input end is provided with a rectifier diode D1, be provided with an electrochemical capacitor C1 between described insurance resistance R 1 and the rectifier diode D1, the negative pole of described electrochemical capacitor C1 connects the positive pole of rectifier diode D1, the base stage of switch triode Q1 is connected to the collector electrode of a triode Q2 by resistance R 4, the emitter of switch triode Q1 is connected to the positive pole of rectifier diode D1, the base stage of triode Q2 is connected to the positive pole of rectifier diode D1 successively by resistance R 5 and polarity free capacitor C3, the base stage of triode Q2 is connected to the input of auxiliary winding successively by resistance R 5 and resistance R 6 simultaneously, and the emitter of triode Q2 is connected to the positive pole of rectifier diode D1; Also be provided with a rectifier diode D2 and a resistance R 7 between the input of described auxiliary winding and the zero line side, one end of described resistance R 7 connects ground terminal, the other end connects the positive pole of rectifier diode D2, the negative pole of rectifier diode D2 is connected to the input of auxiliary winding, the output head grounding of described auxiliary winding; The two ends of described resistance R 7 an electrochemical capacitor C4 in parallel, the positive pole of described electrochemical capacitor C4 is connected with ground terminal, and negative pole is connected with the positive pole of rectifier diode D2; The negative pole of voltage stabilizing didoe Z1 connects the collector electrode of triode Q2, the anodal positive pole that connects described rectifier diode D2; Be connected with resistance R 2, polarity free capacitor C2 and resistance R 3 between the input of described insurance resistance R 1 and described auxiliary winding in turn, the collector electrode of described triode Q2 is connected between resistance R 2 and the polarity free capacitor C2 simultaneously.
Dc output end of the present utility model can adopt following circuit design, one end of described secondary winding is connected to the positive pole of described dc output end by a rectifier diode D3, be connected with an electrochemical capacitor C5 between the negative pole of described rectifier diode D3 and the negative pole of described dc output end, the positive pole of described electrochemical capacitor C5 connects the negative pole of described rectifier diode D3, also is provided with a resistance R 8 and a LED between the positive pole of described dc output end and the negative pole.
Better, described rectifier diode D3 is Schottky rectifier diode or fast recovery rectifier diode.
The beneficial effects of the utility model are:
1, saved and utilize photoelectrical coupler to gather the voltage and current signal of secondary winding and feed back to elementary winding to come regulated output voltage, directly utilized the auxiliary winding of voltage stabilizing didoe Z1, resistance R 7, electrochemical capacitor C4, rectifier diode D2 and transformer to realize constant voltage output.When output voltage raises, the auxiliary winding energy stored of transformer strengthens, puncture voltage stabilizing didoe Z1 by the rising of the negative pressure after the reverse rectification of rectifier diode D2, the base voltage that has dragged down switch triode Q1 makes the switching speed of switch triode Q1 slow down, duty ratio reduces, and has come output voltage thereby reduce.Otherwise when output voltage reduced, the auxiliary winding energy stored of transformer reduced.Because the auxiliary winding and the transformer main winding of transformer are in the same way, make the auxiliary winding of transformer accelerate like this by the charging rate of 3 couples of polarity free capacitor C2 of resistance R, make the switching speed of switch triode Q1 accelerate, thereby output voltage is raise.Resistance R 7 is the electric currents that are used for limiting rectifier diode D2, the charging rate of control electrochemical capacitor C4, the height of adjustable output voltage.
2, need not integrated circuit with high costs or other control circuits come current limliting, carry out current limliting by resistance R 3, polarity free capacitor C3, resistance R 5, triode Q2 and transformer auxiliary winding.The energy that the transformer secondary output winding provides when output current strengthens strengthens, correspondingly the energy of transformer auxiliary winding also strengthens, accelerate triode Q2 ON time (Ton) for capacitor C 3 charging rates by resistance R 6 and shorten, the ON time of switching tube Q1 (Ton) also shortens and makes output current reduce.Otherwise the energy that the transformer secondary output winding provides when output current reduces reduces, correspondingly the energy of transformer auxiliary winding also reduces, it is elongated to reduce triode Q2 ON time (Ton) for polarity free capacitor C3 charging rate by resistance R 6, and the also elongated output current that makes of the ON time of switching tube Q1 (Ton) strengthens.But when resistance R 6 resistances are adjusted to the limit when big, the charging rate of polarity free capacitor C3 is also become very slow, can not make triode Q2 normally and shutoff.Thereby the capacity of regulating the resistance size of resistance R 3 and polarity free capacitor C3 can regulate the height of RC time constant control output current, and the while also can be limited the size of power output, thereby has overcome integrated circuit cost height, shortcomings such as antistatic effect difference;
Simultaneously, the emitter of primary switch triode of the present utility model need not by current sense resistor ground connection, has avoided causing easily the aircraft bombing phenomenon of switching tube explosion, improved the conversion efficiency of entire product, not only circuit is simple, and the production assembly cost is low, and product is easy to use, highly versatile.
Description of drawings
Fig. 1, the utility model circuit theory diagrams.
Embodiment
Below in conjunction with accompanying drawing the utility model is elaborated, referring to accompanying drawing 1, the constant voltage and current limiting RCC charger control circuit of a kind of former limit feedback, comprise ac input end, dc output end, transformer with elementary winding and secondary winding, elementary winding is made up of main winding and auxiliary winding, ac input end connects elementary winding, dc output end connects secondary winding, the input of main winding connects the live wire end of ac input end by insurance resistance R 1, the output of main winding is connected with the collector electrode of a switch triode Q1, the zero line side of ac input end is provided with rectifier diode D1, be provided with electrochemical capacitor C1 between insurance resistance R 1 and the rectifier diode D1, the negative pole of electrochemical capacitor C1 connects the positive pole of rectifier diode D1, the base stage of switch triode Q1 is connected to the collector electrode of a triode Q2 by resistance R 4, the emitter of switch triode Q1 is connected to zero line side, the base stage of triode Q2 is connected to zero line side by resistance R 5 and polarity free capacitor C3 successively, the base stage of triode Q2 is connected to the input of auxiliary winding successively by resistance R 5 and resistance R 6 simultaneously, and the emitter of triode Q2 directly connects zero line side; Be provided with rectifier diode D2 and resistance R 7 between the input of auxiliary winding and the zero line side, one end of resistance R 7 connects zero line side, the other end connects the positive pole of rectifier diode D2, and the negative pole of rectifier diode D2 is connected to the input of auxiliary winding, the output head grounding of auxiliary winding; Electrochemical capacitor C4 is connected in parallel on the two ends of resistance R 7, and the positive pole of electrochemical capacitor C4 is connected with zero line side, and negative pole is connected with the positive pole of rectifier diode D2; The negative pole of voltage stabilizing didoe Z1 connects the collector electrode of triode Q2, the anodal positive pole that connects described rectifier diode D2; Be connected with resistance R 2 in turn between the input of insurance resistance R 1 and auxiliary winding, polarity free capacitor C2 and resistance R 3, the collector electrode of triode Q3 is connected between resistance R 2 and the polarity free capacitor C2 simultaneously, one end of secondary winding is connected to the positive pole of dc output end by rectifier diode D3, be connected with electrochemical capacitor C5 between the negative pole of Schottky rectifier diode D3 and the negative pole of dc output end, the positive pole of electrochemical capacitor C5 connects the negative pole of Schottky rectifier diode D3, also be provided with resistance R 8 and LED between the positive pole of dc output end and the negative pole, LED is arranged between the negative pole of resistance R 8 and dc output end.
When the input supply voltage step-down arrives to a certain degree, the base stage that offers switch triode Q1 by resistance R 2 can not get the supply voltage and the electric current of normally, switch triode Q1 is in off state, thus whole power supply no-output voltage, and circuit is in the under-voltage locking state.When input supply voltage is elevated to a certain degree; input voltage strengthens for the voltage rising electric current of voltage stabilizing didoe Z1 by resistance R 2; thereby voltage stabilizing didoe Z1 is punctured; the base voltage of switch triode Q1 is pulled down to can not the normally state; making switching tube turn-off quits work; thereby whole power supply no-output voltage, circuit is in the overvoltage protection state.
This circuit can be realized overcurrent protection, overpower protection by resistance R 3, polarity free capacitor C3, resistance R 5, triode Q2 and transformer auxiliary winding.The energy that the transformer secondary output winding provides when output current strengthens strengthens, correspondingly the energy of transformer auxiliary winding also strengthens, accelerate triode Q2 ON time (Ton) for polarity free capacitor C3 charging rate by resistance R 6 and shorten, the ON time of switch triode Q1 (Ton) also shortens and makes output current reduce.Otherwise the energy that the transformer secondary output winding provides when output current reduces reduces, correspondingly the energy of transformer auxiliary winding also reduces, it is elongated to reduce triode Q2 ON time (Ton) for polarity free capacitor C3 charging rate by resistance R 6, and the also elongated output current that makes of the ON time of switch triode Q1 (Ton) strengthens.But when resistance R 6 resistances are adjusted to the limit when big, the charging rate of polarity free capacitor C3 is also become very slow, can not make triode Q2 normally and shutoff.Thereby the capacity of regulating the resistance size of resistance R 3 and polarity free capacitor C3 can regulate the height of RC time constant control output current, and the while also can be limited the size of power output.
Control circuit described in the utility model can be applied to battery chargers such as mobile phone, cordless telephone, PDA, digital camera, small-power adapter, PC, accessory power supplys such as TV etc.
It should be noted that at last: above embodiment only in order to the explanation the utility model and and the described technical scheme of unrestricted the utility model; Therefore, it will be understood by those of skill in the art that still and can make amendment or be equal to replacement the utility model although this specification has been described in detail the utility model with reference to each above-mentioned embodiment; And all do not break away from the technical scheme and the improvement thereof of spirit and scope of the present utility model, and it all should be encompassed in the claim scope of the present utility model.
Claims (3)
1. the constant voltage and current limiting RCC charger control circuit of a former limit feedback, comprise ac input end, dc output end, transformer with elementary winding and secondary winding, described elementary winding is made up of main winding and auxiliary winding, described ac input end connects elementary winding, described dc output end connects described secondary winding, it is characterized in that: the input of described main winding connects the live wire end of ac input end by insurance resistance (R1), the output of described main winding is connected with the collector electrode of a switch triode (Q1), the zero line side of described ac input end is provided with a rectifier diode (D1), be provided with an electrochemical capacitor (C1) between described insurance resistance (R1) and the rectifier diode (D1), the negative pole of described electrochemical capacitor (C1) connects the positive pole of rectifier diode (D1), the base stage of switch triode (Q1) is connected to the collector electrode of a triode (Q2) by resistance (R4), the emitter of switch triode (Q1) is connected to zero line side by rectifier diode (D1), the base stage of triode (Q2) is connected to the positive pole of rectifier diode (D1) successively by resistance (R5) and polarity free capacitor (C3), the base stage of triode (Q2) is connected to the input of auxiliary winding successively by resistance (R5) and resistance (R6) simultaneously, and the emitter of triode (Q2) is connected to the positive pole of rectifier diode (D1); Also be provided with a rectifier diode (D2) and a resistance (R7) between the input of described auxiliary winding and the zero line side, one end of described resistance (R7) connects zero line side, the other end connects the positive pole of rectifier diode (D2), the negative pole of rectifier diode (D2) is connected to the input of auxiliary winding, the output head grounding of described auxiliary winding; The two ends of described resistance (R7) electrochemical capacitor (C4) in parallel, the positive pole of described electrochemical capacitor (C4) is connected with the positive pole of rectifier diode (D1), and negative pole is connected with the positive pole of rectifier diode (D2); The negative pole of voltage stabilizing didoe (Z1) connects the collector electrode of triode (Q2), the anodal positive pole that connects described rectifier diode (D2); Be connected with resistance (R2), polarity free capacitor (C2) and resistance (R3) between the input of described insurance resistance (R1) and described auxiliary winding in turn, the collector electrode of described triode (Q2) is connected between resistance (R2) and the polarity free capacitor (C2) simultaneously.
2. according to the constant voltage and current limiting RCC charger control circuit of the described a kind of former limit of claim 1 feedback, it is characterized in that: an end of described secondary winding is connected to the positive pole of described dc output end by a rectifier diode (D3), be connected with an electrochemical capacitor (C5) between the negative pole of described rectifier diode (D3) and the negative pole of described dc output end, the positive pole of described electrochemical capacitor (C5) connects the negative pole of described rectifier diode (D3), also is provided with resistance (R8) and light-emitting diode (LED) between the positive pole of described dc output end and the negative pole.
3. according to the constant voltage and current limiting RCC charger control circuit of the described a kind of former limit of claim 2 feedback, it is characterized in that: described rectifier diode (D3) is Schottky rectifier diode or fast recovery rectifier diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205906607U CN201868933U (en) | 2010-11-03 | 2010-11-03 | Control circuit for primary-side feedback constant-voltage current-limiting RCC charger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205906607U CN201868933U (en) | 2010-11-03 | 2010-11-03 | Control circuit for primary-side feedback constant-voltage current-limiting RCC charger |
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| Publication Number | Publication Date |
|---|---|
| CN201868933U true CN201868933U (en) | 2011-06-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010205906607U Expired - Fee Related CN201868933U (en) | 2010-11-03 | 2010-11-03 | Control circuit for primary-side feedback constant-voltage current-limiting RCC charger |
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| Country | Link |
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| CN (1) | CN201868933U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102769976A (en) * | 2012-07-18 | 2012-11-07 | 东莞市领冠半导体照明有限公司 | GU10 dimming power supply |
| CN103108438A (en) * | 2011-11-15 | 2013-05-15 | 东林科技股份有限公司 | Light source supplying module |
-
2010
- 2010-11-03 CN CN2010205906607U patent/CN201868933U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103108438A (en) * | 2011-11-15 | 2013-05-15 | 东林科技股份有限公司 | Light source supplying module |
| CN103108438B (en) * | 2011-11-15 | 2015-02-04 | 东林科技股份有限公司 | Light source supplying module |
| CN102769976A (en) * | 2012-07-18 | 2012-11-07 | 东莞市领冠半导体照明有限公司 | GU10 dimming power supply |
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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: 20110615 Termination date: 20121103 |