CN201699598U - Switch power adapter - Google Patents
Switch power adapter Download PDFInfo
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- CN201699598U CN201699598U CN2010202366236U CN201020236623U CN201699598U CN 201699598 U CN201699598 U CN 201699598U CN 2010202366236 U CN2010202366236 U CN 2010202366236U CN 201020236623 U CN201020236623 U CN 201020236623U CN 201699598 U CN201699598 U CN 201699598U
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Abstract
The utility model relates to a switch power adapter which comprises a circuit board provided in a switch power housing. The circuit board comprises a voltage adjustment unit and a positive-negative pole transfer unit. A transfer switch SW1 of the voltage adjustment unit is used for selecting a pull-down resistor of a present three-terminal-adjustable shunt reference source IC1. The change to voltage stabilization value of IC1 is realized through changing the pull-down resistor of IC1. The loop feedback of a switch tube is controlled through a four-pin optical coupler for obtaining a purpose of adjustable output voltage. The positive-negative pole transfer unit realizes positive-negative pole transfer through selecting the connection mode of a double-pole double-throw six-pin two-wire toggle switch SW2. The switch power adapter of the utility model has adjustable output voltage and positive-negative pole, and can adjust to appropriate voltages (3V,5V,6V,7.5V,9V,12V,19V,24V) through the selection of two toggle switches on the switch power adapter without any modification to the circuit. The applicability of the switch power adapter is effectively improved.
Description
Technical field
The utility model relates to the switch power technology field, is a kind of switch power source adapter specifically.
Background technology
In the switchette power-supply system of output less than 50W, have a variety ofly at present in design, but can be described as of being used of RCC (Ringing choke convertor, vibration suppresses code converter) mode is maximum.Above RCC such as its name, its title all be attached to elemental motion, this circuit also was called the auto-excitation type flyback converter.
The RCC circuit does not need the control of external clock, just can produce vibration by switch transformer and switching tube, so very simple of the structure of circuit, so just causes with low cost.So, can with among circuit make the power supply adaptor of low price.And the Miniature Power Unit supply on the market also adopts RCC to design.The main pluses and minuses of RCC circuit are as follows:
1, circuit structure is simple, and Costco Wholesale is low.
2, auto-excitation type vibration does not need to design accessory power supply.
3, along with the variation of output voltage or electric current, after the startup, frequency period alters a great deal.
4, Zhuan Huan efficient is not high, can not make large power supply.
5, noise mainly concentrates on low-frequency range.
6, output voltage fixed single.
7, the output both positive and negative polarity is fixed.
Can see that from above several respects in the evolution of switch power technology, not improvement and the development that the output voltage and the both positive and negative polarity of Switching Power Supply are done adjustment at any time is to adapt to the use of different electrical appliances.And in fact, there are apparent in view weak point in the output voltage of conventional switch power supply and both positive and negative polarity tunable arrangement, cause all electrical appliances just can use with corresponding power supply.
The utility model content
At the defective that exists in the prior art, the purpose of this utility model is to provide a kind of switch power source adapter, and output voltage and both positive and negative polarity are adjustable, can adapt to the external power supply of different low-power electrical devices.
For reaching above purpose, the technical scheme that the utility model is taked is:
A kind of switch power source adapter comprises the Switching Power Supply housing, is provided with circuit board in the Switching Power Supply housing, it is characterized in that, described circuit board comprises: voltage-adjusting unit and both positive and negative polarity converting unit,
Described voltage-adjusting unit comprises the change over switch SW1 that is connected with the reference utmost point R of the adjustable shunting a reference source of three ends IC1, and described change over switch SW1 one the tunnel changes five road change over switches,
Five output pins of change over switch SW1 connect the end of resistance R 13, R16, R15, R14, R17 respectively, and resistance R 13, R16, R15, R14, R17 are the pull down resistor of the adjustable shunting a reference source of three ends IC1,
The other end of resistance R 13, R16, R15, R14, R17 all is connected with output ground;
One end of capacitor C 11 connects output ground, another termination high pressure ground;
The negative electrode K of three ends are adjustable shunting a reference source IC1 connects an end of four footlights coupling IC2, capacitor C 10 respectively;
The other end of capacitor C 10 behind series resistance R11, the R12, is connected to the positive pole of capacitor C 8 successively, and the negative pole of capacitor C 8 connects the anode A of the adjustable shunting a reference source of three ends IC1, and the anode A of three ends are adjustable shunting a reference source IC1 is connected with output ground;
Described both positive and negative polarity converting unit comprises a dpdt double-pole double-throw (DPDT) six pin duplex toggle switch SW2,
Output DC line is connected to 2,5 pins of dpdt double-pole double-throw (DPDT) six pin duplex toggle switch SW2,
1,4 pins of dpdt double-pole double-throw (DPDT) six pin duplex toggle switch SW2 are received the output ground polar curve of switch transformer T respectively, and 1,4 pins are connected with the negative pole of capacitor C 8,
3,6 pins of dpdt double-pole double-throw (DPDT) six pin duplex toggle switch SW2 are received the output cathode line of switch transformer T respectively, and 3,6 pins are connected with the positive pole of capacitor C 8.
On the basis of technique scheme, the model of the adjustable shunting a reference source of described three ends IC1 is TL431.
On the basis of technique scheme, the resistance of described resistance R 13, R16, R15, R14, R17 is followed successively by 18K Ω, 15K Ω, 39K Ω, 27K Ω, 9.5K Ω.
On the basis of technique scheme, the model of described four footlights coupling IC2 is PC817, and the negative electrode K of three ends are adjustable shunting a reference source IC1 connects No. 2 pins of four footlights coupling IC2.
On the basis of technique scheme, be parallel with LED and resistance R 18 between capacitor C 8 and dpdt double-pole double-throw (DPDT) six pin duplex toggle switch SW2, the positive pole of LED is connected to the positive pole of capacitor C 8.
On the basis of technique scheme, be provided with diode in series D7 and inductance L 2 between capacitor C 8 and switch transformer T, diode D7 and capacitor C 9 parallel connections,
Capacitor C 7 is in parallel with capacitor C 8, and the positive pole of capacitor C 7 is connected with the negative pole of diode D7,
The positive pole of capacitor C 7 is connected with an end of resistance R 9, and the other end of resistance R 9 is connected with an end, the four footlights coupling IC2 of resistance R 8 respectively; The model of described four footlights coupling IC2 is PC817, and the other end of resistance R 9 connects No. 1 pin of four footlights coupling IC2;
The other end of resistance R 8 is connected with the negative electrode K of the adjustable shunting a reference source of three ends IC1.
Switch power source adapter described in the utility model, output voltage and both positive and negative polarity are adjustable, need not circuit is done any change, only need to select just to be transferred to suitable to comprise both positive and negative polarity conversion, effectively raise applicability of the present utility model with voltage (3V, 5V, 6V, 7.5V, 9V, 12V, 19V, 24V) by two toggle switches on the utility model.
Description of drawings
The utility model has following accompanying drawing:
The circuit theory diagrams of Fig. 1 switch power source adapter.
Embodiment
Below in conjunction with accompanying drawing the utility model is described in further detail.
Switch power source adapter described in the utility model comprises the Switching Power Supply housing, is provided with circuit board in the Switching Power Supply housing, and the circuit theory diagrams of this circuit board is characterized in that as shown in Figure 1 described circuit board comprises:
Voltage-adjusting unit, described voltage-adjusting unit comprise the change over switch SW1 that is connected with the reference utmost point R of the adjustable shunting a reference source of three ends IC1, and the model of the adjustable shunting a reference source of described three ends IC1 is TL431, and described change over switch SW1 one the tunnel changes five road change over switches,
Five output pins of change over switch SW1 connect the end of resistance R 13, R16, R15, R14, R17 respectively, and the resistance of resistance R 13, R16, R15, R14, R17 is followed successively by 18K Ω, 15K Ω, 39K Ω, 27K Ω, 9.5K Ω; Resistance R 13, R16, R15, R14, R17 are the pull down resistor of the adjustable shunting a reference source of three ends IC1,
The other end of resistance R 13, R16, R15, R14, R17 all is connected with output ground;
One end of capacitor C 11 connects output ground, another termination high pressure ground; This electric capacity is called Y electric capacity;
The negative electrode K of three ends are adjustable shunting a reference source IC1 connects an end of four footlights coupling IC2, capacitor C 10 respectively; The model of described four footlights coupling IC2 is PC817, and the negative electrode K of three ends are adjustable shunting a reference source IC1 connects No. 2 pins of four footlights coupling IC2;
The other end of capacitor C 10 behind series resistance R11, the R12, is connected to the positive pole of capacitor C 8 successively, and the negative pole of capacitor C 8 connects the anode A of the adjustable shunting a reference source of three ends IC1, and the anode A of three ends are adjustable shunting a reference source IC1 is connected with output ground;
Both positive and negative polarity converting unit, described both positive and negative polarity converting unit comprise a dpdt double-pole double-throw (DPDT) six pin duplex toggle switch SW2,
Output DC line is connected to 2,5 pins of dpdt double-pole double-throw (DPDT) six pin duplex toggle switch SW2,
1,4 pins of dpdt double-pole double-throw (DPDT) six pin duplex toggle switch SW2 are received the output stage ground wire of switch transformer T respectively, and 1,4 pins are connected with the negative pole of capacitor C 8,
3,6 pins of dpdt double-pole double-throw (DPDT) six pin duplex toggle switch SW2 are received the output cathode line of switch transformer T respectively, and 3,6 pins are connected with the positive pole of capacitor C 8, by selecting the connected mode of dpdt double-pole double-throw (DPDT) six pin duplex toggle switch SW2, realize the both positive and negative polarity conversion.
On the basis of technique scheme, be parallel with LED and resistance R 18 between capacitor C 8 and dpdt double-pole double-throw (DPDT) six pin duplex toggle switch SW2, the positive pole of LED is connected to the positive pole of capacitor C 8.
On the basis of technique scheme, be provided with diode in series D7 and inductance L 2 between capacitor C 8 and switch transformer T, diode D7 and capacitor C 9 parallel connections,
Capacitor C 7 is in parallel with capacitor C 8, and the positive pole of capacitor C 7 is connected with the negative pole of diode D7,
The positive pole of capacitor C 7 is connected with an end of resistance R 9, and the other end of resistance R 9 is connected with an end, the four footlights coupling IC2 of resistance R 8 respectively; The model of described four footlights coupling IC2 is PC817, and the other end of resistance R 9 connects No. 1 pin of four footlights coupling IC2;
The other end of resistance R 8 is connected with the negative electrode K of the adjustable shunting a reference source of three ends IC1.
The course of work of voltage-adjusting unit is: change over switch SW1 is used to select to work as the pull down resistor of the adjustable shunting a reference source of first three end IC1, pull down resistor (R13, R14, R15, R16, R17) by changing the adjustable shunting a reference source of three ends IC1 thus realize changing the voltage stabilizing value of the adjustable shunting a reference source of three ends IC1, through the loop feedback of four footlights coupling IC2 control switch pipes, to reach the purpose of Adjustable Output Voltage.
The course of work of circuit board shown in Figure 1 is:
After AC IN interface is connected 220V city voltage, produce the 300V direct voltage by current rectifying and wave filtering circuit, described current rectifying and wave filtering circuit comprises: resistance R 1, capacitor C 1, L1 (model is UU98), diode D1-D4 (model is 4007), capacitor C 2;
The 300V direct voltage that current rectifying and wave filtering circuit produces divides two-way output: the elementary winding of switch transformer T of leading up to is added to the drain D of switching tube Q1; Another road is added to switching tube Q1 grid G by resistance R 6, makes switching tube Q1 conducting; Resistance R 6 is used as starting resistance in this circuit;
After the switching tube Q1 conducting, its drain D conducting electric current stored magnetic energy in switch transformer T because mutual inductance, the corresponding generation 3 of switch transformer T positive feedback winding just, 4 negative induced electromotive forces.So the positive pulse voltage on switch transformer T the 3rd pin is added to the grid (the G utmost point) of Q1 by C4, R4, another road is added to Q3 base stage (the B utmost point) and Q2 collector electrode (the C utmost point) by divider resistance R2, because Q3 emitter (the E utmost point) connects Q1 source electrode (the S utmost point) Q1 drain electrode (the D utmost point) electric current is further increased, so switching tube Q1 under the effect of positive feedback avalanche process, enters saturation condition rapidly.Switching tube Q1 is between the period of saturation, and current rectifying and wave filtering circuit D7, C9, C7, L2, C8 that switch transformer T secondary winding is connect end because of induced electromotive force is anti-phase, so electric energy just is stored in the elementary winding of transformer T inside in the mode of magnetic energy.Because compole is short during the positive feedback avalanche process, timing capacitor C4 has little time charging (being equivalent to short circuit).After Q1 entered saturation condition, the induced voltage on the positive feedback winding charged to C4, and along with constantly carrying out of C5 charging, its two ends potential difference raises.So the conducting loop of Q1 is cut off, and makes Q1 withdraw from saturation condition.After switching tube Q1 withdrawed from saturation condition, its internal resistance increased, and causes drain current further to descend.Because the electric current in the inductance can not suddenly change,, after the voltage stack that pulse voltage that positive feedback winding 3 ends are negative and timing capacitor C4 are filled, Q1 is ended rapidly so the induced electromotive force of each winding of switch transformer T is anti-phase.Switching tube Q1 between the off period, switch transformer T releasing magnetic energy, current rectifying and wave filtering circuit D7, the C9, C7, L2, the C8 that are connect by switch transformer T secondary winding provide electric energy to load.
Because producing induced voltage, switch transformer T secondary winding charges to C7, C8 through D7, through after several cycles of oscillation, C7, C8 charging voltage are elevated to more than the setting voltage, this output voltage is through R19, optical coupler IC2 (1-2 pin) light-emitting diode punctures voltage-stabiliser tube IC1, and optical coupler IC2 (3-4 pin) conducting simultaneously makes the feedback winding of switch transformer T be added to the base stage (the B utmost point) of Q2 by the D6 rectified output voltage, the Q2 saturation conduction, switching tube Q1 failure of oscillation.Another road then the positive and negative selection by L2, SW2 to powering to the load.This moment, C7, C8 discharged to load circuit, and as C7, when the C8 discharge voltage is lower than setting voltage, voltage-stabiliser tube IC1 ends, and Q2, Q3 end immediately, and switching tube Q1 starting oscillation again repeats said process.Its result keeps the stable of output voltage by vibration one process of inhibition.
Because switch transformer T exists leakage inductance and parasitic oscillation, cause the winding spike distortion of the former limit of switch transformer T, switching tube Q1 electric current is increased, increase the circuit unsteadiness, in order to reduce the spike distortion, this circuit is provided with R7, C3, D5 absorption circuit, thereby promotes the reliability and stability of this circuit.
More than show and described basic principle of the present utility model and principal character and advantage.The technical staff of the industry should understand, the utility model is not restricted to the described embodiments, that describes in the foregoing description and the specification just illustrates principle of the present utility model, under the prerequisite that does not break away from the utility model spirit and scope, the utility model also has various changes and modifications, and these changes and improvements all fall in the utility model scope.The claimed scope of the utility model has appending claims and equivalent thereof to define.
Claims (6)
1. a switch power source adapter comprises the Switching Power Supply housing, is provided with circuit board in the Switching Power Supply housing, it is characterized in that, described circuit board comprises: voltage-adjusting unit and both positive and negative polarity converting unit,
Described voltage-adjusting unit comprises the change over switch SW1 that is connected with the reference utmost point R of the adjustable shunting a reference source of three ends IC1, and described change over switch SW1 one the tunnel changes five road change over switches,
Five output pins of change over switch SW1 connect the end of resistance R 13, R16, R15, R14, R17 respectively, and resistance R 13, R16, R15, R14, R17 are the pull down resistor of the adjustable shunting a reference source of three ends IC1,
The other end of resistance R 13, R16, R15, R14, R17 all is connected with output ground;
One end of capacitor C 11 connects output ground, another termination high pressure ground;
The negative electrode K of three ends are adjustable shunting a reference source IC1 connects an end of four footlights coupling IC2, capacitor C 10 respectively;
The other end of capacitor C 10 behind series resistance R11, the R12, is connected to the positive pole of capacitor C 8 successively, and the negative pole of capacitor C 8 connects the anode A of the adjustable shunting a reference source of three ends IC1, and the anode A of three ends are adjustable shunting a reference source IC1 is connected with output ground;
Described both positive and negative polarity converting unit comprises a dpdt double-pole double-throw (DPDT) six pin duplex toggle switch SW2,
Output DC line is connected to 2,5 pins of dpdt double-pole double-throw (DPDT) six pin duplex toggle switch SW2,
1,4 pins of dpdt double-pole double-throw (DPDT) six pin duplex toggle switch SW2 are received the output ground polar curve of switch transformer T respectively, and 1,4 pins are connected with the negative pole of capacitor C 8,
3,6 pins of dpdt double-pole double-throw (DPDT) six pin duplex toggle switch SW2 are received the output cathode line of switch transformer T respectively, and 3,6 pins are connected with the positive pole of capacitor C 8.
2. switch power source adapter as claimed in claim 1 is characterized in that: the model of the adjustable shunting a reference source of described three ends IC1 is TL431.
3. switch power source adapter as claimed in claim 1 is characterized in that: the resistance of described resistance R 13, R16, R15, R14, R17 is followed successively by 18K Ω, 15K Ω, 39K Ω, 27K Ω, 9.5K Ω.
4. switch power source adapter as claimed in claim 1 is characterized in that: the model of described four footlights coupling IC2 is PC817, and the negative electrode K of three ends are adjustable shunting a reference source IC1 connects No. 2 pins of four footlights coupling IC2.
5. switch power source adapter as claimed in claim 1 is characterized in that: be parallel with LED and resistance R 18 between capacitor C 8 and dpdt double-pole double-throw (DPDT) six pin duplex toggle switch SW2, the positive pole of LED is connected to the positive pole of capacitor C 8.
6. switch power source adapter as claimed in claim 1 is characterized in that: be provided with diode in series D7 and inductance L 2 between capacitor C 8 and switch transformer T, and diode D7 and capacitor C 9 parallel connections,
Capacitor C 7 is in parallel with capacitor C 8, and the positive pole of capacitor C 7 is connected with the negative pole of diode D7,
The positive pole of capacitor C 7 is connected with an end of resistance R 9, and the other end of resistance R 9 is connected with an end, the four footlights coupling IC2 of resistance R 8 respectively; The model of described four footlights coupling IC2 is PC817, and the other end of resistance R 9 connects No. 1 pin of four footlights coupling IC2;
The other end of resistance R 8 is connected with the negative electrode K of the adjustable shunting a reference source of three ends IC1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202366236U CN201699598U (en) | 2010-06-25 | 2010-06-25 | Switch power adapter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202366236U CN201699598U (en) | 2010-06-25 | 2010-06-25 | Switch power adapter |
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| Publication Number | Publication Date |
|---|---|
| CN201699598U true CN201699598U (en) | 2011-01-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010202366236U Expired - Fee Related CN201699598U (en) | 2010-06-25 | 2010-06-25 | Switch power adapter |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103124144A (en) * | 2011-10-21 | 2013-05-29 | 三星电子株式会社 | Power supplier and image forming apparatus including the power supplier |
| CN103428949A (en) * | 2012-05-24 | 2013-12-04 | 海洋王照明科技股份有限公司 | Constant current drive circuit and light fixture |
| CN105471227A (en) * | 2015-12-31 | 2016-04-06 | 深圳市迈思普电子有限公司 | Power supply and output voltage conversion control circuit therefor |
| CN108322018A (en) * | 2018-02-09 | 2018-07-24 | 佛山市和富创电子科技有限公司 | A kind of novel power adapter |
| CN116316503A (en) * | 2023-01-18 | 2023-06-23 | 广东工业大学 | Bridge arm switch tube gate-source voltage spike adjusting device and implementation method |
| US20230268840A1 (en) * | 2022-02-18 | 2023-08-24 | Changxin Memory Technologies, Inc. | Power supply circuit |
| WO2023155260A1 (en) * | 2022-02-18 | 2023-08-24 | 长鑫存储技术有限公司 | Power supply circuit |
-
2010
- 2010-06-25 CN CN2010202366236U patent/CN201699598U/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103124144A (en) * | 2011-10-21 | 2013-05-29 | 三星电子株式会社 | Power supplier and image forming apparatus including the power supplier |
| CN103124144B (en) * | 2011-10-21 | 2018-03-06 | 爱思打印解决方案有限公司 | Charger and the image processing system including charger |
| CN103428949A (en) * | 2012-05-24 | 2013-12-04 | 海洋王照明科技股份有限公司 | Constant current drive circuit and light fixture |
| CN105471227A (en) * | 2015-12-31 | 2016-04-06 | 深圳市迈思普电子有限公司 | Power supply and output voltage conversion control circuit therefor |
| CN108322018A (en) * | 2018-02-09 | 2018-07-24 | 佛山市和富创电子科技有限公司 | A kind of novel power adapter |
| US20230268840A1 (en) * | 2022-02-18 | 2023-08-24 | Changxin Memory Technologies, Inc. | Power supply circuit |
| WO2023155260A1 (en) * | 2022-02-18 | 2023-08-24 | 长鑫存储技术有限公司 | Power supply circuit |
| CN116316503A (en) * | 2023-01-18 | 2023-06-23 | 广东工业大学 | Bridge arm switch tube gate-source voltage spike adjusting device and implementation method |
| CN116316503B (en) * | 2023-01-18 | 2023-09-22 | 广东工业大学 | Bridge arm switch tube gate-source voltage spike adjusting device and implementation method |
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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: 20110105 Termination date: 20140625 |
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| EXPY | Termination of patent right or utility model |