CN201122903Y - Electric power of switch - Google Patents
Electric power of switch Download PDFInfo
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- CN201122903Y CN201122903Y CNU2007200562589U CN200720056258U CN201122903Y CN 201122903 Y CN201122903 Y CN 201122903Y CN U2007200562589 U CNU2007200562589 U CN U2007200562589U CN 200720056258 U CN200720056258 U CN 200720056258U CN 201122903 Y CN201122903 Y CN 201122903Y
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Abstract
The utility model relates to a switching power supply, which belongs to the technical field of the power supply. The switching power supply comprises an input rectifying and filtering circuit connected with the input terminal of the power supply, an output rectifying and filtering circuit connected with the output terminal of the power supply, a self-excited oscillation circuit, a voltage stabilizing circuit and a starting circuit, wherein one terminal of the starting circuit is connected with the output terminal of the input rectifying and filtering circuit, the other terminal of the starting circuit is connected with the input terminal of the self-excited oscillation circuit, the output terminal of the self-excited oscillation circuit is connected with the input terminal of the output rectifying and filtering circuit, the input terminal of the voltage stabilizing circuit is connected with the output rectifying and filtering circuit, and the output terminal of the voltage stabilizing circuit is connected with the self-excited oscillation circuit. The switching power supply has the advantages that the stability is high, the output ripple is low, the performance of electromagnetic interference resistance can be improved, and the capability of static electricity resistance can be enhanced.
Description
Technical field:
The utility model relates to power technique fields, refers in particular to a kind of Switching Power Supply.
Background technology:
Along with fast development of society, increasing household electrical appliance have entered each family, and these household electrical appliance much all adopt Switching Power Supply, to increase work efficiency and the needs that adapt to different input voltages.Simultaneously, in order to satisfy the requirement of various electrical equipment high-performance and high target, these electrical equipment also require higher to the technical performance of the Switching Power Supply of use.But, at present the Switching Power Supply of using all ubiquity that stability is not high, output ripple is big, problems such as anti-electromagnetic interference and antistatic effect difference.
The utility model content:
The purpose of this utility model is exactly to provide a kind of Switching Power Supply that can reduce output ripple, the anti-electromagnetic interference performance of improvement and improve antistatic effect at the deficiency of prior art existence.
To achieve these goals, the technical solution adopted in the utility model is: it comprises the input rectifying filter circuit that is connected with power input, the output rectifier and filter that is connected with power output end, self-maintained circuit, voltage stabilizing circuit, it is characterized in that it also comprises start-up circuit, one end of start-up circuit is connected with the output of input rectifying filter circuit, the other end of start-up circuit is connected with the input of self-maintained circuit, the output of self-maintained circuit is connected with the input of output rectifier and filter, the input of voltage stabilizing circuit is connected with output rectifier and filter, and the output of voltage stabilizing circuit is connected with self-maintained circuit.
Described input rectifying filter circuit is made up of diode bridge rectifier circuit and filter circuit, and the output of diode bridge rectifier circuit is connected with the input of filter circuit.
Described filter circuit is made up of resistance R 1, capacitor C 1, C2 and inductance L 1, is serially connected in after resistance R 1 and inductance L 1 are in parallel between the positive pole of the positive pole of capacitor C 1 and C2.
Described start-up circuit comprises resistance R 2, R3, R4, R12, capacitor C 3, C11 and diode D5, capacitor C 11 is attempted by the two ends of elementary winding N1, the end ground connection of elementary winding N1, the positive pole of the other end and diode D5 joins, the negative pole of diode D5 is connected with an end of resistance R 12, be serially connected between the other end and ground of R12 after resistance R 2 and capacitor C 3 parallel connections, be connected between the input and ground of self-maintained circuit after resistance R 3, the R4 series connection.
Described self-maintained circuit comprises triode Q1, diode D6, resistance R 5, R7, R8, R11 and capacitor C 5, the collector electrode of triode Q1 is connected with start-up circuit, the emitter of triode Q1 is connected with the end of elementary winding N3, the other end of elementary winding N3 is connected with the positive pole of diode D6, the negative pole of diode D6 is successively through resistance R 8, R7, R5 is connected with the base stage of triode Q1, capacitor C 5 is attempted by the two ends of diode D6, one end of resistance R 11 and diode D6 positive pole join, the other end is connected with the positive pole of voltage stabilizing didoe Z1, and the negative pole of voltage stabilizing didoe Z1 is connected with resistance R 10 and R6.
Described output rectifier and filter comprises resistance R 13, capacitor C 7, C8, C9 and diode D7, resistance R 13 be attempted by between the positive pole and negative pole of diode D7 after capacitor C 8 is connected, the positive pole of diode D7 is connected with the end of secondary winding N2, the negative pole of diode D7 is connected with the positive pole of capacitor C 7, the other end of the negative pole of capacitor C 7 and secondary winding N2 joins, the positive pole of capacitor C 7 is connected with an end of inductance L 2, the other end of inductance L 2 is connected capacitor C 9 with an end of resistance R 15, resistance R 18 series connection R17, voltage stabilizing didoe Z2 is attempted by the two ends of power output end.
Described voltage stabilizing circuit comprises triode Q2, photoelectrical coupler U1, voltage-stabiliser tube U2, capacitor C 6 is to be connected between the base stage and emitter of triode Q2, the collector electrode of triode Q2 is connected with self-maintained circuit, first pin of photoelectrical coupler U1, second pin are connected with the base stage of self-maintained circuit with triode Q2 respectively, resistance R 14 is connected between the three-prong and the 4th pin of photoelectrical coupler U1, between capacitor C 10 and the negative electrode that is connected on voltage-stabiliser tube U2 after resistance R 16 is connected and the control utmost point, the anode of voltage-stabiliser tube U2 is connected with output rectifier and filter.
The utility model beneficial effect is: an end of the utility model start-up circuit is connected with the output of input rectifying filter circuit, the other end of start-up circuit is connected with the input of self-maintained circuit, the output of self-maintained circuit is connected with the input of output rectifier and filter, the input of voltage stabilizing circuit is connected with output rectifier and filter, the output of voltage stabilizing circuit is connected with self-maintained circuit, the utlity model has the characteristics of high stability, reduction output ripple, the anti-electromagnetic interference performance of improvement and raising antistatic effect.
Description of drawings:
Fig. 1 is a theory diagram of the present utility model;
Fig. 2 is circuit theory diagrams of the present utility model.
Embodiment:
Below in conjunction with accompanying drawing the utility model is further described, see accompanying drawing 1, shown in 2, the utility model comprises the input rectifying filter circuit 1 that is connected with power input, the output rectifier and filter 4 that is connected with power output end, self-maintained circuit 3, voltage stabilizing circuit 5 and start-up circuit 2, one end of start-up circuit 2 is connected with the output of input rectifying filter circuit 1, the other end of start-up circuit 2 is connected with the input of self-maintained circuit 3, the output of self-maintained circuit 3 is connected with the input of output rectifier and filter 4, the input of voltage stabilizing circuit 5 is connected with output rectifier and filter 4, and the output of voltage stabilizing circuit 5 is connected with self-maintained circuit 3.
Described input rectifying filter circuit 1 is made up of diode bridge rectifier circuit and filter circuit, and the output of diode bridge rectifier circuit is connected with the input of filter circuit.
Described filter circuit is made up of resistance R 1, capacitor C 1, C2 and inductance L 1, is serially connected in after resistance R 1 and inductance L 1 are in parallel between the positive pole of the positive pole of capacitor C 1 and C2, can reduce the impedance of L1, helps improving anti-electromagnetic interference performance and improves antistatic effect.
Described start-up circuit 2 comprises resistance R 2, R3, R4, R12, capacitor C 3, C11 and diode D5, capacitor C 11 is attempted by the two ends of elementary winding N1, can improve anti-electromagnetic interference performance and reduce output ripple, the end ground connection of elementary winding N1, the positive pole of the other end and diode D5 joins, the negative pole of diode D5 is connected with an end of resistance R 12, be serially connected between the other end and ground of R12 after resistance R 2 and capacitor C 3 parallel connections, be connected between the input and ground of self-maintained circuit 3 after resistance R 3, the R4 series connection.
Described self-maintained circuit 3 comprises triode Q1; diode D6; resistance R 5; R7; R8; R11 and capacitor C 5; the collector electrode of triode Q1 is connected with start-up circuit 2; the emitter of triode Q1 is connected with the end of elementary winding N3; the other end of elementary winding N3 is connected with the positive pole of diode D6; the negative pole of diode D6 is successively through resistance R 8; R7; R5 is connected with the base stage of triode Q1; capacitor C 5 is attempted by the two ends of diode D6; one end of resistance R 11 and diode D6 positive pole join; the other end is connected with the negative pole of voltage stabilizing didoe Z1; the positive pole of voltage stabilizing didoe Z1 is connected with resistance R 10 and R6; defencive function be can strengthen, fail safe and stability had more.
Described output rectifier and filter 4 comprises resistance R 13, capacitor C 7, C8, C9 and diode D7, resistance R 13 be attempted by between the positive pole and negative pole of diode D7 after capacitor C 8 is connected, can reduce the stability of output ripple and maintenance terminal equipment, the positive pole of diode D7 is connected with the end of secondary winding N2, the negative pole of diode D7 is connected with the positive pole of capacitor C 7, the other end of the negative pole of capacitor C 7 and secondary winding N2 joins, the positive pole of capacitor C 7 is connected with an end of inductance L 2, the other end of inductance L 2 is connected capacitor C 9 with an end of resistance R 15, resistance R 18 series connection R17, voltage stabilizing didoe Z2 is attempted by the two ends of power output end.
Described voltage stabilizing circuit 5 comprises triode Q2, photoelectrical coupler U1, voltage-stabiliser tube U2, capacitor C 6 is to be connected between the base stage and emitter of triode Q2, the collector electrode of triode Q2 is connected with self-maintained circuit 3, first pin of photoelectrical coupler U1, second pin are connected with the base stage of self-maintained circuit 3 with triode Q2 respectively, resistance R 14 is connected between the three-prong and the 4th pin of photoelectrical coupler U1, between capacitor C 10 and the negative electrode that is connected on voltage-stabiliser tube U2 after resistance R 16 is connected and the control utmost point, the anode of voltage-stabiliser tube U2 is connected with output rectifier and filter 4.
Operation principle: AC1, the AC2 of power input connect AC network, the AC1 of power input is through fuse RF1, diode bridge rectifier circuit D1～D4 rectification, the astable direct voltage of exporting after the filter circuit filtering, the one tunnel is added to the elementary winding N1 of T1 and the collector electrode of triode Q1, and another road is through resistance R 3, R4, be added to the base stage of Q1, the moment of power connection, R3, R4 provide electric current to the base stage of Q1, make the Q1 conducting; After the Q1 conducting, the collector current of Q1 rises, on the elementary winding N1 of transformer T1, produce negative just down voltage, to elementary winding N3, produce negative positive induced voltage down through transformer coupled, this voltage is through C5, R5, R7, be added to the base stage of Q1 behind the R8, the base potential of Q1 is risen, collector current further increases, the voltage at elementary winding N1 two ends raises, the voltage at N3 two ends also raises, the Q1 base voltage further raises again, the effect of positive feedback makes the Q1 saturation conduction, at Q1 between the period of saturation, the current rectifying and wave filtering circuit at T1 secondary winding N2 place ends because of induced electromotive force is anti-phase, induced voltage during the Q1 saturation conduction on the N3 is through C5, R5, R7, R8 continues to provide base current to Q1, this electric current charges to C5, polarity is last negative just down, the voltage of C5 negative terminal is through R5, R7, R8 is added to the Q1 base stage, the base current of Q1 is descended, cause the Q1 collector current to descend, Q1 changes magnifying state over to from the saturation conduction state, and base current and collector current further reduce, and the effect of last positive feedback ends Q1; When Q1 ends, electric current among the elementary winding N1 can not transition, continue to keep former direction circulation, so producing negative positive voltage down on the N1, coupling through T1, this voltage makes the D7 conducting, energy stored among the elementary group of N1 is coupled to secondary winding N2 after D7 powers to the load, when Q1 ends, make that the induced voltage on the N3 is last negative just down, the D6 conducting, charging voltage on the C5 is released, and by N3, the D6 reverse charging, the last reverse charging voltage of C5 is through R5, R7, R8 is added to the Q1 base stage, makes Q1 conducting again, collector current rises, it is positive induced voltage that elementary group of N1 produces end of the same name, and it is positive induced voltage that N3 also produces end of the same name, and this voltage is through C5, R5, R7, R8 is added to the Q1 base stage, base current also further increases, collector current further increases, and Q1 is because of the positive feedback saturation conduction, and circuit is in self oscillating regime again and again; Behind output voltage, the difference that obtains voltage on the reference voltage of U2 and the R17 produces electric current, and act on photoelectrical coupler U1 through resistance R 15, electric current increase along with U1, the voltage that R8 is offered Q1 reduces, and Q1 is transferred to by conducting in advance end, otherwise, the voltage that offers Q1 increases, thereby reaches the purpose of voltage stabilizing.
Certainly, the embodiment of the above, it is preferred embodiments of the present utility model, be not to limit the utility model practical range, so all equivalences of doing according to the described structure of the utility model claim, feature and principle change or modify, and are included in the utility model claim.
Claims (7)
1, a kind of Switching Power Supply, it comprises the input rectifying filter circuit (1) that is connected with power input, the output rectifier and filter that is connected with power output end (4), self-maintained circuit (3), voltage stabilizing circuit (5), it is characterized in that: it also comprises start-up circuit (2), one end of start-up circuit (2) is connected with the output of input rectifying filter circuit (1), the other end of start-up circuit (2) is connected with the input of self-maintained circuit (3), the output of self-maintained circuit (3) is connected with the input of output rectifier and filter (4), the input of voltage stabilizing circuit (5) is connected with output rectifier and filter (4), and the output of voltage stabilizing circuit (5) is connected with self-maintained circuit (3).
2, a kind of Switching Power Supply according to claim 1 is characterized in that: described input rectifying filter circuit (1) is made up of diode bridge rectifier circuit and filter circuit, and the output of diode bridge rectifier circuit is connected with the input of filter circuit.
3, a kind of Switching Power Supply according to claim 2 is characterized in that: described filter circuit is made up of resistance R 1, capacitor C 1, C2 and inductance L 1, is serially connected in after resistance R 1 and inductance L 1 are in parallel between the positive pole of the positive pole of capacitor C 1 and C2.
4, a kind of Switching Power Supply according to claim 1, it is characterized in that: described start-up circuit (2) comprises resistance R 2, R3, R4, R12, capacitor C 3, C11 and diode D5, capacitor C 11 is attempted by the two ends of elementary winding N1, the end ground connection of elementary winding N1, the positive pole of the other end and diode D5 joins, the negative pole of diode D5 is connected with an end of resistance R 12, be serially connected between the other end and ground of R12 after resistance R 2 and capacitor C 3 parallel connections, be connected between the input and ground of self-maintained circuit (3) after resistance R 3, the R4 series connection.
5, a kind of Switching Power Supply according to claim 1, it is characterized in that: described self-maintained circuit (3) comprises triode Q1, diode D6, resistance R 5, R7, R8, R11 and capacitor C 5, the collector electrode of triode Q1 is connected with start-up circuit (2), the emitter of triode Q1 is connected with the end of elementary winding N3, the other end of elementary winding N3 is connected with the positive pole of diode D6, the negative pole of diode D6 is successively through resistance R 8, R7, R5 is connected with the base stage of triode Q1, capacitor C 5 is attempted by the two ends of diode D6, one end of resistance R 11 and diode D6 positive pole join, the other end is connected with the negative pole of voltage stabilizing didoe Z1, and the positive pole of voltage stabilizing didoe Z1 is connected with resistance R 10 and R6.
6, a kind of Switching Power Supply according to claim 1, it is characterized in that: described output rectifier and filter (4) comprises resistance R 13, capacitor C 7, C8, C9 and diode D7, resistance R 13 be attempted by between the positive pole and negative pole of diode D7 after capacitor C 8 is connected, the positive pole of diode D7 is connected with the end of secondary winding N2, the negative pole of diode D7 is connected with the positive pole of capacitor C 7, the other end of the negative pole of capacitor C 7 and secondary winding N2 joins, the positive pole of capacitor C 7 is connected with an end of inductance L 2, the other end of inductance L 2 is connected capacitor C 9 with an end of resistance R 15, resistance R 18 series connection R17, voltage stabilizing didoe Z2 is attempted by the two ends of power output end.
7, a kind of Switching Power Supply according to claim 1, it is characterized in that: described voltage stabilizing circuit (5) comprises triode Q2, photoelectrical coupler U1, voltage-stabiliser tube U2, capacitor C 6 is to be connected between the base stage and emitter of triode Q2, the collector electrode of triode Q2 is connected with self-maintained circuit (3), first pin of photoelectrical coupler U1, second pin is connected with the base stage of self-maintained circuit 3 with triode Q2 respectively, resistance R 14 is connected between first pin and second pin of photoelectrical coupler U1, between capacitor C 10 and the negative electrode that is connected on voltage-stabiliser tube U2 after resistance R 16 is connected and the control utmost point, the anode of voltage-stabiliser tube U2 is connected with output rectifier and filter (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200562589U CN201122903Y (en) | 2007-08-28 | 2007-08-28 | Electric power of switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200562589U CN201122903Y (en) | 2007-08-28 | 2007-08-28 | Electric power of switch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201122903Y true CN201122903Y (en) | 2008-09-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200562589U Expired - Fee Related CN201122903Y (en) | 2007-08-28 | 2007-08-28 | Electric power of switch |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201122903Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104427687A (en) * | 2013-08-23 | 2015-03-18 | 深圳市海洋王照明工程有限公司 | Voltage output circuit and lamp |
| CN117118244A (en) * | 2023-10-23 | 2023-11-24 | 国仪量子(合肥)技术有限公司 | High-voltage power supply device |
-
2007
- 2007-08-28 CN CNU2007200562589U patent/CN201122903Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104427687A (en) * | 2013-08-23 | 2015-03-18 | 深圳市海洋王照明工程有限公司 | Voltage output circuit and lamp |
| CN117118244A (en) * | 2023-10-23 | 2023-11-24 | 国仪量子(合肥)技术有限公司 | High-voltage power supply device |
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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: 20080924 Termination date: 20090928 |