CN202424555U - Power supply based on three-winding transformer - Google Patents
Power supply based on three-winding transformer Download PDFInfo
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- CN202424555U CN202424555U CN2011205487311U CN201120548731U CN202424555U CN 202424555 U CN202424555 U CN 202424555U CN 2011205487311 U CN2011205487311 U CN 2011205487311U CN 201120548731 U CN201120548731 U CN 201120548731U CN 202424555 U CN202424555 U CN 202424555U
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Abstract
The utility model discloses a power supply based on a three-winding transformer. The power supply comprises a three-winding transformer (T1), a first triode (Q1), a second triode (Q2) and a voltage regulator tube (ZD1), wherein a second winding and a third winding are in a same phase position, voltage relationships are in a direct proportion, when an output voltage rises, a current flows through the ZD1 to form an electric potential at the position of a R10, when the electric potential of the R10 is higher than a Q2 base electrode break-over voltage, a collector electrode and an emitter electrode (CE electrodes) of the Q2 are on, and a Q1 base electrode is pulled down to be turned off, and output over voltage protection is achieved. According to the power supply based on the three-winding transformer, the number of the utilized components is small, the structure is simple, and the power supply is easy to implement, and has an over voltage protection (OVP) function.
Description
Technical field
The utility model relates to a kind of power supply based on three-winding transformer, and being applicable to the LED lamp provides power supply.
Background technology
Existing power supply based on three-winding transformer, the device of employing is many, cost is high, therefore be necessary to design a kind of cheaply, device is few and the power supply based on three-winding transformer of good stability.
The utility model content
The utility model technical problem to be solved provides a kind of novel power supply based on three-winding transformer, and the device that should adopt based on the power supply of three-winding transformer is few, simple in structure, easy to implement, has overvoltage protection (OVP) function.
The technical solution of utility model is following:
A kind of power supply based on three-winding transformer comprises three-winding transformer (T1), first triode (Q1), second triode (Q2) and voltage-stabiliser tube (ZD1);
Three-winding transformer (T1) comprises first winding, second winding and the tertiary winding, and first winding is the input winding, and second winding is the output winding;
The positive voltage output end of the first termination rectification circuit of first winding, the C utmost point of second termination, first triode (Q1) of first winding, the e utmost point of first triode (Q1) is through first resistance (R8) ground connection;
Second resistance (R5), electric capacity (C3), three resistance (R0) and four resistance (R9) ground connection of first end of the tertiary winding through being connected in series successively; First end of the tertiary winding is through voltage-stabiliser tube (ZD1), the 6th resistance (R6), the 5th resistance (R10) of serial connection connect the e utmost point of first triode (Q1) successively; The second end ground connection of the tertiary winding;
The b utmost point of first triode (Q1) connects the tie point of the 3rd resistance (R0) and the 4th resistance (R9);
The c utmost point of second triode (Q2) connects the tie point of electric capacity (C3) and the 3rd resistance (R0); The c utmost point of second triode (Q2) also connects first end of first winding through the 7th resistance (R2B); The b utmost point of second triode (Q2) connects the tie point of the 5th resistance (R10) and the 6th resistance (R6); The e utmost point ground connection of second triode (Q2);
First end of second end of first winding, the positive voltage output end of second winding and the tertiary winding is an end of the same name.
Described first triode (Q1) and second triode (Q2) are NPN type triode.Beneficial effect:
The power supply based on three-winding transformer of the utility model adopts a three-winding transformer, 2 triodes, a voltage-stabiliser tube and some resistance promptly to realize overvoltage protection dexterously, and the device of employing is few, and cost is low, and reliable operation, good stability.
Description of drawings
Fig. 1 is the schematic diagram based on the power supply of three-winding transformer of the utility model.
Embodiment
Below will combine accompanying drawing and specific embodiment that the utility model is explained further details:
Embodiment 1:
As shown in Figure 1, a kind of power supply based on three-winding transformer comprises three-winding transformer T1, the first triode Q1, the second triode Q2 and voltage-stabiliser tube ZD1;
Three-winding transformer T1 comprises first winding, second winding and the tertiary winding, and first winding is the input winding, and second winding is the output winding; Second winding connects the LED lamp.
The positive voltage output end of the first termination rectification circuit of first winding, the C utmost point of second termination, the first triode Q1 of first winding, the e utmost point of the first triode Q1 is through first resistance R, 8 ground connection;
First end of the tertiary winding is through second resistance R 5, capacitor C 3, the 3rd resistance R 0 and the 4th resistance R 9 ground connection of serial connection successively; First end of the tertiary winding connects the e utmost point of the first triode Q1 through the voltage-stabiliser tube ZD1 of serial connection successively, the 6th resistance R 6, the 5th resistance R 10; The second end ground connection of the tertiary winding;
The b utmost point of the first triode Q1 connects the tie point of the 3rd resistance R 0 and the 4th resistance R 9;
The c utmost point of the second triode Q2 connects the tie point of capacitor C 3 and the 3rd resistance R 0; The c utmost point of the second triode Q2 also connects first end of first winding through the 7th resistance R 2B; The b utmost point of the second triode Q2 connects the tie point of the 5th resistance R 10 and the 6th resistance R 6; The e utmost point ground connection of the second triode Q2;
First end of second end of first winding, the positive voltage output end of second winding and the tertiary winding is an end of the same name.
The described first triode Q1 and the second triode Q2 are NPN type triode.
For the device and the circuit that have nothing to do with overvoltage protection in the circuit diagram, do not introduce.
The operation principle explanation:
This circuit is fit to be used in low-cost Switching Power Supply output OVP protection, forms Primary Component and comprises: D3 ZD1 Q2 R10.
Operation principle: second winding and the tertiary winding be the position in the same way, and voltage relationship is a direct ratio, when output voltage raises; ZD1 has electric current to flow through; On the position of R10, form a current potential, when the current potential on the R10 exceeds the Q2 base-on voltage, the CE utmost point conducting of Q2; Drag down the Q1 base stage its is turn-offed, realize output over-voltage protection.
Claims (2)
1. the power supply based on three-winding transformer is characterized in that, comprises three-winding transformer (T1), first triode (Q1), second triode (Q2) and voltage-stabiliser tube (ZD1);
Three-winding transformer (T1) comprises first winding, second winding and the tertiary winding, and first winding is the input winding, and second winding is the output winding;
The positive voltage output end of the first termination rectification circuit of first winding, the C utmost point of second termination, first triode (Q1) of first winding, the e utmost point of first triode (Q1) is through first resistance (R8) ground connection;
Second resistance (R5), electric capacity (C3), three resistance (R0) and four resistance (R9) ground connection of first end of the tertiary winding through being connected in series successively; First end of the tertiary winding is through voltage-stabiliser tube (ZD1), the 6th resistance (R6), the 5th resistance (R10) of serial connection connect the e utmost point of first triode (Q1) successively; The second end ground connection of the tertiary winding;
The b utmost point of first triode (Q1) connects the tie point of the 3rd resistance (R0) and the 4th resistance (R9);
The c utmost point of second triode (Q2) connects the tie point of electric capacity (C3) and the 3rd resistance (R0); The c utmost point of second triode (Q2) also connects first end of first winding through the 7th resistance (R2B); The b utmost point of second triode (Q2) connects the tie point of the 5th resistance (R10) and the 6th resistance (R6); The e utmost point ground connection of second triode (Q2);
First end of second end of first winding, the positive voltage output end of second winding and the tertiary winding is an end of the same name.
2. the power supply based on three-winding transformer according to claim 1 is characterized in that, described first triode (Q1) and second triode (Q2) are NPN type triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205487311U CN202424555U (en) | 2011-12-23 | 2011-12-23 | Power supply based on three-winding transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205487311U CN202424555U (en) | 2011-12-23 | 2011-12-23 | Power supply based on three-winding transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202424555U true CN202424555U (en) | 2012-09-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011205487311U Expired - Fee Related CN202424555U (en) | 2011-12-23 | 2011-12-23 | Power supply based on three-winding transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202424555U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107579657A (en) * | 2017-09-11 | 2018-01-12 | 深圳市创芯技术有限公司 | One kind is without Y without common mode high energy efficiency power circuit |
-
2011
- 2011-12-23 CN CN2011205487311U patent/CN202424555U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107579657A (en) * | 2017-09-11 | 2018-01-12 | 深圳市创芯技术有限公司 | One kind is without Y without common mode high energy efficiency power circuit |
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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: 20120905 Termination date: 20121223 |