CN2888739Y - A switch power supply - Google Patents
A switch power supply Download PDFInfo
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- CN2888739Y CN2888739Y CN 200620039706 CN200620039706U CN2888739Y CN 2888739 Y CN2888739 Y CN 2888739Y CN 200620039706 CN200620039706 CN 200620039706 CN 200620039706 U CN200620039706 U CN 200620039706U CN 2888739 Y CN2888739 Y CN 2888739Y
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- power supply
- switching power
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Abstract
The utility model relates to a switch power, which comprises an input rectifier circuit connected to the input end of the power, an output rectifier circuit connected to the output end of the power. The rectifier circuit is connected to the high-frequency oscillation circuit, the high-frequency oscillation circuit is coupling connected to the output rectifier circuit, the output rectifier circuit is coupling connected to the protection circuit, the protection circuit is connected to the high-frequency oscillation circuit. The utility model has the advantages of high reliability, low ripple, low conduction and low radiation interference.
Description
Technical field:
The present invention relates to a kind of Switching Power Supply.
Background technology:
The technology of Switching Power Supply is developed by leaps and bounds along with scientific technological advance, and present specification requirement Switching Power Supply has more high-tech performance, as high reliability, not fragile, the dependability that do not influence miscellaneous equipment.The code requirement of low ripple, low conduction interference and radiated interference is also strict day by day, and U.S. FCC, West Germany VDE-0871 standard testing all have the specific targets requirement.Switching Power Supply lacks special measure to above-mentioned technical index design at present, thereby causes various bad phenomenon easily, and is fragile as Switching Power Supply, influences equipment dependability, and ripple pollutes signal source, conduct radiation interference power, equipment, electric equipment etc.
Summary of the invention:
The object of the present invention is to provide the Switching Power Supply of a kind of high reliability, low ripple, low conduction, low radiated interference.
To achieve these goals; technical scheme of the present invention is as follows: a kind of Switching Power Supply; comprise the input rectifying filter circuit that is connected with power input; the output rectifier and filter that is connected with power output end; it is characterized in that current rectifying and wave filtering circuit is connected with high-frequency oscillating circuits; high-frequency oscillating circuits and output rectifier and filter are of coupled connections, and output rectifier and filter also is of coupled connections with protective circuit, and protective circuit is connected with high-frequency oscillating circuits.Wherein the circuit of input rectifying filter circuit is as follows: the power supply first input end is connected with an end of first thermistor, the other end of first thermistor is connected with an end of filter transformer first winding, power supply second input is connected with an end of second thermistor, be connected with piezo-resistance between the other end of the other end of first thermistor and second thermistor, the other end of second thermistor also is connected with an end of filter transformer second winding, the other end of first winding of filter transformer is connected with an input of rectification module, the other end of second winding of filter transformer is connected with another input of rectification module, also be connected with first electric capacity between two inputs of rectification module, the output of rectification module is connected with high-frequency oscillating circuits, and second electric capacity is connected in the output of rectification module in parallel.The circuit of high-frequency oscillating circuits is as follows: the positive output end of rectification module is connected with the anode of second breakdown diode, the negative terminal of second breakdown diode is connected with the anode of first diode, the negative terminal of first diode is connected with the 3rd end of Switching Power Supply voltage stabilizing chip, second end of Switching Power Supply voltage stabilizing chip is connected with the negative output terminal of rectification module, the anode of second breakdown diode is connected with the tail end of high frequency transformer primary coil, and the head end of high frequency transformer first coil is connected with the anode of first diode.The circuit of output rectifier and filter is as follows: the head end of high frequency transformer secondary coil is connected with the anode of the 3rd diode, the negative terminal of the 3rd diode is connected with the power supply positive output end, the 3rd diode and the 9th electric capacity are connected in parallel, the tail end of high frequency transformer secondary coil is connected with an end of inductance coil, the other end of inductance coil is connected with the power-output, the negative terminal of first voltage-stabiliser tube is connected with the power supply positive output end, the anode of first voltage-stabiliser tube is connected with the tail end of high frequency transformer secondary coil, the 7th electric capacity and the 6th resistance and first voltage-stabiliser tube are connected in parallel, and the 8th electric capacity is connected in parallel on the power output end two ends.The circuit of protective circuit is as follows: an end of the 5th resistance is connected with the power supply positive output end; the other end of the 5th resistance is connected with the positive input terminal of optocoupler; the negative input end of optocoupler is connected with the negative terminal of voltage-reference diode; the anode of voltage-reference diode is connected with the power-input; the head end of high frequency transformer feedback coil is connected with the anode of second diode; the negative terminal of second diode is connected with the positive output end of optocoupler; the negative output terminal of optocoupler is connected with first end of Switching Power Supply voltage stabilizing chip; the tail end of high frequency transformer feedback coil is connected with second end of Switching Power Supply voltage stabilizing chip; one end of the 6th electric capacity is connected with the negative terminal of second diode; the other end of the 6th electric capacity is connected with the tail end of high frequency transformer feedback coil; one end of the 4th resistance is connected with first end of Switching Power Supply voltage stabilizing chip; the other end of the 4th resistance is connected with an end of the 5th electric capacity; the other end of the 5th electric capacity is connected with second end of Switching Power Supply voltage stabilizing chip; one end of the 4th electric capacity is connected first end of Switching Power Supply voltage stabilizing chip; the other end of the 4th electric capacity is connected second end of Switching Power Supply voltage stabilizing chip; the negative terminal of second voltage-stabiliser tube is connected with first end of Switching Power Supply voltage stabilizing chip, and the anode of second voltage-stabiliser tube is connected with second end of Switching Power Supply voltage stabilizing chip.
The invention has the advantages that it has characteristics such as high reliability, low ripple, low conduction, low radiated interference.
Description of drawings:
Fig. 1 is a structured flowchart of the present invention
Fig. 2 is the circuit diagram of one embodiment of the invention
Embodiment:
Below in conjunction with drawings and Examples the present invention is elaborated.
A kind of Switching Power Supply; comprise the input rectifying filter circuit 1 that is connected with power input; the output rectifier and filter 3 that is connected with power output end; it is characterized in that current rectifying and wave filtering circuit 1 is connected with high-frequency oscillating circuits 2; high-frequency oscillating circuits 2 is of coupled connections with output rectifier and filter 3; output rectifier and filter 3 also is connected with protective circuit 4, and protective circuit 4 is connected with high-frequency oscillating circuits 2.Wherein the circuit of input rectifying filter circuit 1 is as follows: the power supply first input end is connected with the end of the first thermistor R1, the other end of the first thermistor R1 is connected with an end of filter transformer NF1 first winding, power supply second input is connected with the end of the second thermistor R2, be connected with piezo-resistance Z1 between the other end of the other end of the first thermistor R1 and the second thermistor R2, the other end of the second thermistor R2 also is connected with an end of filter transformer NF1 second winding, the other end of first winding of filter transformer NF1 is connected with the input of rectification module BD1, the other end of second winding of filter transformer NF1 is connected with another input of rectification module BD1, also be parallel with first capacitor C 1 between two inputs of rectification module BD1, the output of rectification module BD1 is connected with high-frequency oscillating circuits 2, and second capacitor C 2 is connected in the output of rectification module BD1 in parallel.The circuit of high-frequency oscillating circuits 2 is as follows: the positive output end of rectification module BD1 is connected with the anode of second breakdown diode Z2, the negative terminal of second breakdown diode Z2 is connected with the anode of the first diode D1, the negative terminal of the first diode D1 is connected with the 3rd end of Switching Power Supply voltage stabilizing chip IC 1, second end of Switching Power Supply voltage stabilizing chip IC 1 is connected with the negative output terminal of rectification module BD1, the anode of second breakdown diode Z2 is connected with the tail end of high frequency transformer T1 primary coil, and the head end of high frequency transformer T1 primary coil is connected with the anode of the first diode D1.The circuit of output rectifier and filter 3 is as follows: the head end of high frequency transformer T1 secondary coil is connected with the anode of the 3rd diode D3, the negative terminal of the 3rd diode D3 is connected with the power supply positive output end, the 9th capacitor C 9 and the 3rd diode D3 are connected in parallel, the tail end of high frequency transformer T1 secondary coil is connected with the end of inductance coil L1, the other end of inductance coil L1 is connected with the power-output, the negative terminal of the first voltage-stabiliser tube ZD1 is connected with the power supply positive output end, the anode of the first voltage-stabiliser tube ZD1 is connected with the tail end of high frequency transformer secondary coil, the 7th capacitor C 7 and the 6th resistance R 6 and the first voltage-stabiliser tube ZD1 are connected in parallel, and the 8th capacitor C 8 is connected in parallel on the power output end two ends.The circuit of protective circuit 4 is as follows: an end of the 5th resistance R 5 is connected with the power supply positive output end; the other end of the 5th resistance R 5 is connected with the positive input terminal of optocoupler PC1; the negative input end of optocoupler PC1 is connected with the negative terminal of voltage-reference diode SHR; the anode of voltage-reference diode SHR is connected with the power-input; the head end of high frequency transformer T1 feedback coil is connected with the anode of the second diode D2; the negative terminal of the second diode D2 is connected with the positive output end of optocoupler PC1; the negative output terminal of optocoupler PC1 is connected with first end of Switching Power Supply voltage stabilizing chip IC 1; the tail end of high frequency transformer T1 feedback coil is connected with second end of Switching Power Supply voltage stabilizing chip IC 1; one end of the 6th capacitor C 6 is connected with the negative terminal of the second diode D2; the other end of the 6th capacitor C 6 is connected with the tail end of high frequency transformer T1 feedback coil; one end of the 4th resistance R 4 is connected with first end of Switching Power Supply voltage stabilizing chip IC 1; the other end of the 4th resistance R 4 is connected with an end of the 5th capacitor C 5; the other end of the 5th capacitor C 5 is connected with second end of Switching Power Supply voltage stabilizing chip IC 1; one end of the 4th capacitor C 4 is connected first end of Switching Power Supply voltage stabilizing chip IC 1; the other end of the 4th capacitor C 4 is connected second end of Switching Power Supply voltage stabilizing chip IC 1; the negative terminal of the second voltage-stabiliser tube ZD2 is connected with first end of Switching Power Supply voltage stabilizing chip IC 1, and the anode of the second voltage-stabiliser tube ZD2 is connected with second end of Switching Power Supply voltage stabilizing chip IC 1.
Difference with the prior art of the present invention is: finish the full-wave rectifier filter function by the input rectifying filter circuit that R1, R2, Z1, NF1, C1, BD1, C2 form, R1, R2 adopt the NTC thermistor, resistance equates, but the loop current direction is opposite, therefore hot property phase isoequilibrium is offset, form filtering with Z1, NF1, C1, the alternating current source conducted interference is played effective inhibition; High-frequency oscillating circuits is selected the IC1 Switching Power Supply voltage stabilizing chip TOP221YN of overheated overcurrent protection for use, and major loop selects for use Z2, D1 to form moment surge voltage absorber, can effectively protect the IC1 power chip, effectively improves operational reliability of switch power supply; Output rectifier and filter has designed D3, C9, C7, C8, L1, high-frequency rectification is finished in the ZD1 loop, and the high frequency secondary filtering has effectively suppressed ripple and radiated interference.
Following table is that Switching Power Supply of the present invention compares with general Switching Power Supply performance test.
Claims (5)
1, a kind of Switching Power Supply; comprise the input rectifying filter circuit that is connected with power input; the output rectifier and filter that is connected with power output end; it is characterized in that current rectifying and wave filtering circuit is connected with high-frequency oscillating circuits; high-frequency oscillating circuits and output rectifier and filter are of coupled connections; output rectifier and filter also is of coupled connections with protective circuit, and protective circuit is connected with high-frequency oscillating circuits.
2, by the described Switching Power Supply of claim 1, the circuit that it is characterized in that the input rectifying filter circuit is as follows: the power supply first input end is connected with an end of first thermistor, the other end of first thermistor is connected with an end of filter transformer first winding, power supply second input is connected with an end of second thermistor, be connected with piezo-resistance between the other end of the other end of first thermistor and second thermistor, the other end of second thermistor also is connected with an end of filter transformer second winding, the other end of first winding of filter transformer is connected with an input of rectification module, the other end of second winding of filter transformer is connected with another input of rectification module, also be connected with first electric capacity between two inputs of rectification module, the output of rectification module is connected with high-frequency oscillating circuits, and second electric capacity is connected in the output of rectification module in parallel.
3, by the described Switching Power Supply of claim 1, the circuit that it is characterized in that high-frequency oscillating circuits is as follows: the positive output end of rectification module is connected with the anode of second breakdown diode, the negative terminal of second breakdown diode is connected with the anode of first diode, the negative terminal of first diode is connected with the 3rd end of Switching Power Supply voltage stabilizing chip, second end of Switching Power Supply voltage stabilizing chip is connected with the negative output terminal of rectification module, the anode of second breakdown diode is connected with the tail end of high frequency transformer primary coil, and the head end of high frequency transformer first coil is connected with the anode of first diode.
4, by the described Switching Power Supply of claim 1, the circuit that it is characterized in that output rectifier and filter is as follows: the head end of high frequency transformer secondary coil is connected with the anode of the 3rd diode, the negative terminal of the 3rd diode is connected with the power supply positive output end, the 3rd diode and the 9th electric capacity are connected in parallel, the tail end of high frequency transformer secondary coil is connected with an end of inductance coil, the other end of inductance coil is connected with the power-output, the negative terminal of first voltage-stabiliser tube is connected with the power supply positive output end, the anode of first voltage-stabiliser tube is connected with the tail end of high frequency transformer secondary coil, the 7th electric capacity and the 6th resistance and first voltage-stabiliser tube are connected in parallel, and the 8th electric capacity is connected in parallel on the power output end two ends.
5; by the described Switching Power Supply of claim 1; the circuit that it is characterized in that protective circuit is as follows: an end of the 5th resistance is connected with the power supply positive output end; the other end of the 5th resistance is connected with the positive input terminal of optocoupler; the negative input end of optocoupler is connected with the negative terminal of voltage-reference diode; the anode of voltage-reference diode is connected with the power-input; the head end of high frequency transformer feedback coil is connected with the anode of second diode; the negative terminal of second diode is connected with the positive output end of optocoupler; the negative output terminal of optocoupler is connected with first end of Switching Power Supply voltage stabilizing chip; the tail end of high frequency transformer feedback coil is connected with second end of Switching Power Supply voltage stabilizing chip; one end of the 6th electric capacity is connected with the negative terminal of second diode; the other end of the 6th electric capacity is connected with the tail end of high frequency transformer feedback coil; one end of the 4th resistance is connected with first end of Switching Power Supply voltage stabilizing chip; the other end of the 4th resistance is connected with an end of the 5th electric capacity; the other end of the 5th electric capacity is connected with second end of Switching Power Supply voltage stabilizing chip; one end of the 4th electric capacity is connected first end of Switching Power Supply voltage stabilizing chip; the other end of the 4th electric capacity is connected second end of Switching Power Supply voltage stabilizing chip; the negative terminal of second voltage-stabiliser tube is connected with first end of Switching Power Supply voltage stabilizing chip, and the anode of second voltage-stabiliser tube is connected with second end of Switching Power Supply voltage stabilizing chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620039706 CN2888739Y (en) | 2006-02-23 | 2006-02-23 | A switch power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620039706 CN2888739Y (en) | 2006-02-23 | 2006-02-23 | A switch power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2888739Y true CN2888739Y (en) | 2007-04-11 |
Family
ID=38047310
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620039706 Expired - Fee Related CN2888739Y (en) | 2006-02-23 | 2006-02-23 | A switch power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2888739Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101889211A (en) * | 2007-12-08 | 2010-11-17 | 赖茵豪森机械制造公司 | Device for testing transformers |
-
2006
- 2006-02-23 CN CN 200620039706 patent/CN2888739Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101889211A (en) * | 2007-12-08 | 2010-11-17 | 赖茵豪森机械制造公司 | Device for testing transformers |
| CN101889211B (en) * | 2007-12-08 | 2013-04-17 | 赖茵豪森机械制造公司 | Device for testing transformers |
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| 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: 20070411 Termination date: 20130223 |