CN202679264U - Switching power supply device - Google Patents
Switching power supply device Download PDFInfo
- Publication number
- CN202679264U CN202679264U CN 201220371705 CN201220371705U CN202679264U CN 202679264 U CN202679264 U CN 202679264U CN 201220371705 CN201220371705 CN 201220371705 CN 201220371705 U CN201220371705 U CN 201220371705U CN 202679264 U CN202679264 U CN 202679264U
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- control chip
- transformer
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- switching power
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Abstract
The utility model discloses a switching power supply device. The device comprises a transformer, an input rectifier-filter circuit connected with the primary side of the transformer, and an output voltage stabilizing circuit connected with the secondary side of the transformer, and further comprises a control circuit which is connected to the primary side of the transformer, the control circuit can control the transformer to convert input voltage and output voltage in a flyback mode and perform over-current, over-voltage and over-temperature protection function. According to the utility model, the switching power supply device can integrate the voltage stabilizing output circuit together and control the transformer to work in the flyback mode through the control circuit, so that the problems that a conventional switching power supply has large weight by adopting a silicon steel sheet transformer and the silicon steel sheet transformer frequently drops off due to vibration in an impact test to result in direct damage of the whole device because of the large weight; simultaneously, the stability of the output voltage is ensured; and in addition, the device has the characteristic of small size.
Description
Technical field
The utility model relates to power technique fields, specifically a kind of switching power unit.
Background technology
Electrical equipment is used as the Switching Power Supply of standby power at present, generally is to be made of silicon steel sheet transformer and voltage stabilizing circuit.Because there is the large problem of weight in the silicon steel sheet transformer, often when machine product is done the impact shock test, because silicon steel sheet transformer weight is large, transformer when shock test, often occurs and shaken and take off, cause machine product directly to damage.In addition, owing to there being voltage stabilizing circuit, in the production process production technology, element control etc. is had very high requirement, otherwise during debugging, power unit is easy to go wrong.
The utility model content
Technical problem to be solved in the utility model provides that a kind of volume is little, lightweight, the switching power unit of dependable performance.
The technical solution adopted in the utility model is as follows:
A kind of switching power unit; comprise transformer, the input rectifying filter circuit that is connected with described transformer primary, the output voltage stabilizing circuit that is connected with the primary side of described transformer; also comprise control circuit; be connected on the primary side of described transformer, be used for controlling described transformer by anti-sharp mode and carry out the conversion of input and output voltage and carry out overcurrent, overvoltage and over-temperature protection function.
Described control circuit comprises control chip IC1 and switching tube Q1; The collector electrode of described switching tube Q1 connects described transformer, and the base stage of switching tube Q1 connects 5 pin of control chip IC1, and the emitter part of switching tube Q1 connects 4 pin of control chip IC1, part ground connection after resistance R 9; 1 pin of control chip IC1 connects described transformer behind resistance R 5 and diode D2,2 pin of control chip IC1 connect described transformer grounding, and 3 pin of control chip IC1 connect described transformer after resistance R 8 and resistance R 6; 1 pin of capacitor C 6 one termination control chip IC1,2 pin of a termination control chip IC1; 1 pin of capacitor C 5 one termination control chip IC1,2 pin of a termination control chip IC1; 3 pin of capacitor C 4 one termination control chip IC1,2 pin of a termination control chip IC1; Resistance R 7 one terminating resistor R8,2 pin of a termination control chip IC1.
Described control chip IC1 is the IWAT1706 control chip.
Switching power unit described in the utility model is by integrating voltage-stabilizing output circuit, work by anti-sharp mode control transformer by control circuit, thereby solved existing Switching Power Supply adopt the large problem of weight that the silicon steel sheet transformer exists and because of silicon steel sheet transformer weight large, transformer when shock test, often occurs and shaken and take off, the problem that causes machine product directly to damage; Also guaranteed simultaneously the stable of output voltage; In addition, also have the little characteristics of volume.
Description of drawings
Fig. 1 is the circuit theory diagrams of the switching power unit that provides of the utility model.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with accompanying drawing, the utility model is further elaborated.
Referring to Fig. 1; a kind of switching power unit; comprise transformer 2, the input rectifying filter circuit 1 that is connected with the primary side of described transformer 2, the output voltage stabilizing circuit 3 that is connected with the primary side of described transformer 2; also comprise control circuit 4; be connected with the primary side of described transformer 2, be used for controlling that described transformer is inputted and the conversion of output voltage and carry out overcurrent, overvoltage, overcurrent protection function by anti-energisation mode.
Be provided with by resistance R 3, resistance R 4, capacitor C 3 and diode D1 in the primary side of described transformer 2 and consist of the RCD absorption circuit.Capacitor C 3 is used for the leakage inductance energy of temporary transformer 2, resistance R 3, resistance R 4 be used for the dissipating leakage inductance energy of transformer 2, and diode D1 keeps the unilateral conduction of electric current.
Described input rectifying filter circuit is used for input ac voltage is rectified into direct current, and by inductance, capacitor filtering, makes direct voltage supply with very stably late-class circuit; Comprise resistance R F1, rectifier bridge BD1, inductance L 1, inductance L 2 capacitor C 1 and capacitor C 2; The live wire L of three-phase electricity connects the AC end of rectifier bridge BD1 through resistance R F1, the zero line N of three-phase electricity connects the AC end of rectifier bridge BD1, "+" termination inductance L 1 of rectifier bridge BD1, capacitor C 1, "-" termination inductance L 2 of rectifier bridge BD1, capacitor C 1, inductance L 1 part connects late-class circuit, part ground connection after capacitor C 2, ground connection after inductance L 2 other ends are connected with capacitor C 2.
Output voltage stabilizing circuit becomes DC12V output with transformer 2 low pressure winding output voltage stabilizations, includes diode D3, capacitor C 8, capacitor C Y1 and resistance R 10, resistance R 11; Voltage is exported after transformer 2 transformations are by diode D3 rectification, and one part of current is returned transformer 2 after capacitor C 8, and one part of current is returned transformer 2 after resistance R 11; It is in parallel with diode D3 after capacitor C 7 is connected with resistance R 10; The low pressure winding of capacitor C Y1 one termination transformer 2, an end ground connection.
Described control circuit comprises control chip IC1, switching tube Q1; Be used for providing control signal; transformer 2 is operated under high frequency, the optimum environment such as efficient; swash the conversion that principle makes the energy efficient of output, input by anti-, and guarantee the voltage conforms requirement of output, realize simultaneously the defencive functions such as overvoltage protection, overcurrent protection, overheat protector.
Among the utility model embodiment, described control chip IC1 is the IWAT1706 control chip.
The collector electrode of the switching tube Q1 of this control circuit connects transformer 2, and the base stage of switching tube Q1 connects 5 pin of control chip IC1, and the emitter part of switching tube Q1 connects 4 pin of control chip IC1, part ground connection after resistance R 9; 1 pin of control chip IC1 connects transformer 2 behind resistance R 5 and diode D2,2 pin of control chip IC1 connect transformer 2 and ground connection, and 3 pin of control chip IC1 connect transformer 2 after resistance R 8 and resistance R 6; 1 pin of capacitor C 6 one termination control chip IC1,2 pin of a termination control chip IC1; 1 pin of capacitor C 5 one termination control chip IC1,2 pin of a termination control chip IC1; 3 pin of capacitor C 4 one termination control chip IC1,2 pin of a termination control chip IC1; Resistance R 7 one terminating resistor R8,2 pin of a termination control chip IC1.
Wherein, resistance R 9 consists of the output overcurrent protective circuit, can turn-off output when output surpasses specified cut-off current, and protection power source is not damaged; Resistance R 8, resistance R 6, resistance R 7 consist of thermal-shutdown circuit.
Described control circuit also includes by resistance R 1, R2 series connection and consists of protection circuit against input over-voltage, resistance R 1 one termination inductance L 1, one terminating resistor R2; Resistance R 2 one terminating resistor R1,1 pin of a termination control chip IC1; When input voltage exceeded prescribed limit, control chip IC1 can turn-off output, and whole circuit is in a safe condition.
The principle of whole circuit is as follows:
The AC signal of input becomes high direct voltage by the input rectifying filter circuit, then by transformer high direct voltage is become low pressure, exports after the output voltage stabilizing circuit voltage stabilizing.In change procedure, control circuit has played very important effect, and the control circuit cardinal principle is as follows: 1), 5 pin of control chip IC1 are for driving signal output, control switch pipe Q1 switch under the high frequency state, that finishes transformer instead swashs work; 2), 4 pin of control chip IC1 are the current sense function end, come the overcurrent protection function of completing circuit by detecting input current; 3), resistance R 1, R2 be powered on moment control circuit power end, when the input high pressure is too high, can play the input over-voltage protecting function.4), diode D2 powers 5 to the output voltage rectifying and voltage-stabilizing of transformer low voltage winding to control circuit), resistance R 6, R7, the R8 voltage stabilizing of output voltage by control circuit, regulate, output voltage is changed.
Switching power unit described in the utility model is by integrating voltage-stabilizing output circuit, work by anti-sharp mode control transformer by control circuit, thereby solved existing Switching Power Supply adopt the large problem of weight that the silicon steel sheet transformer exists and because of silicon steel sheet transformer weight large, transformer when shock test, often occurs and shaken and take off, cause machine product directly to decrease; Also guaranteed simultaneously the stable of output voltage; In addition, also have the little characteristics of volume.
The above only is preferred implementation of the present utility model; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the utility model principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection range of the present utility model.
Claims (3)
1. switching power unit; it is characterized in that; comprise transformer, the input rectifying filter circuit that is connected with described transformer primary, the output voltage stabilizing circuit that is connected with the primary side of described transformer; also comprise control circuit; be connected on the primary side of described transformer, be used for controlling described transformer by anti-sharp mode and carry out the conversion of input and output voltage and carry out overcurrent, overvoltage and over-temperature protection function.
2. switching power unit according to claim 1 is characterized in that, described control circuit comprises control chip IC1 and switching tube Q1; The collector electrode of described switching tube Q1 connects described transformer, and the base stage of switching tube Q1 connects 5 pin of control chip IC1, and the emitter part of switching tube Q1 connects 4 pin of control chip IC1, part ground connection after resistance R 9; 1 pin of control chip IC1 connects described transformer behind resistance R 5 and diode D2,2 pin of control chip IC1 connect described transformer grounding, and 3 pin of control chip IC1 connect described transformer after resistance R 8 and resistance R 6; 1 pin of capacitor C 6 one termination control chip IC1,2 pin of a termination control chip IC1; 1 pin of capacitor C 5 one termination control chip IC1,2 pin of a termination control chip IC1; 3 pin of capacitor C 4 one termination control chip IC1,2 pin of a termination control chip IC1; Resistance R 7 one terminating resistor R8,2 pin of a termination control chip IC1.
3. switching power unit according to claim 2 is characterized in that, described control chip IC1 is the IWAT1706 control chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220371705 CN202679264U (en) | 2012-07-30 | 2012-07-30 | Switching power supply device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220371705 CN202679264U (en) | 2012-07-30 | 2012-07-30 | Switching power supply device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202679264U true CN202679264U (en) | 2013-01-16 |
Family
ID=47500136
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220371705 Expired - Fee Related CN202679264U (en) | 2012-07-30 | 2012-07-30 | Switching power supply device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202679264U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104617793A (en) * | 2015-01-31 | 2015-05-13 | 深圳市美吉星集成科技有限公司 | BUCK current-double topology without bridge rectifier and DC magnetic bias |
-
2012
- 2012-07-30 CN CN 201220371705 patent/CN202679264U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104617793A (en) * | 2015-01-31 | 2015-05-13 | 深圳市美吉星集成科技有限公司 | BUCK current-double topology without bridge rectifier and DC magnetic bias |
| CN104617793B (en) * | 2015-01-31 | 2017-02-22 | 深圳市美吉星集成科技有限公司 | BUCK current-double topology without bridge rectifier and DC magnetic bias |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130116 Termination date: 20150730 |
|
| EXPY | Termination of patent right or utility model |