CN202455268U - Small-power switch power supply manufactured by using NE555 - Google Patents
Small-power switch power supply manufactured by using NE555 Download PDFInfo
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- CN202455268U CN202455268U CN2012200393914U CN201220039391U CN202455268U CN 202455268 U CN202455268 U CN 202455268U CN 2012200393914 U CN2012200393914 U CN 2012200393914U CN 201220039391 U CN201220039391 U CN 201220039391U CN 202455268 U CN202455268 U CN 202455268U
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Abstract
The utility model belongs to the technical field of electronic technology and power supplies and relates to a small-power switch power supply manufactured by using NE555. The switch power supply is composed of an 18V direct current power supply, a 9V regulated power supply, a non-steady-state multivibrator circuit, an operational amplifier integrated circuit (IC)2, a sampling circuit and a rectifying and electronic filtering circuit. The small-power switch power supply manufactured by using the NE555 is a non-isolation switch power supply, has the advantages of being small in size, light in weight, large in efficiency, high in power supply converting efficiency and stable in working performance, and overcomes the defects of a series-connection regulated power supply of being large in size, low in converting efficiency and the like.
Description
Technical field
The utility model belongs to electronic technology and switch power technology field, is to make small-power switching power-supply about a kind of with NE555.
Background technology
Common D.C. regulated power supply mainly contains two kinds: the one, and the tandem stabilized voltage power supply; The 2nd, the on-off mode stabilized voltage power supply.The former circuit working principle and simple in structure uses components and parts also less, but that its defective is the loss of adjustment pipe is bigger, moreover filter circuit is required high, and power supply conversion efficiency is low; Latter circuit's operation principle and structure are comparatively complicated, but power supply conversion efficiency is higher, so the Switching Power Supply use is very extensive.
The utility model is described makes small-power switching power-supply with NE555; It is a kind of non-isolation type Switching Power Supply; It has, and volume is little, in light weight, power is big, power supply conversion efficiency is higher, the advantage of stable work in work, and it has overcome defectives such as tandem stabilized voltage power supply volume is big, conversion efficiency is low.
Below specify the described correlation technique content that in implementation process, relates to NE555 making small-power switching power-supply of the utility model.
The utility model content
Goal of the invention and beneficial effect: the utility model is described makes small-power switching power-supply with NE555; It is a kind of non-isolation type Switching Power Supply; It has, and volume is little, in light weight, power is big, power supply conversion efficiency is higher, the advantage of stable work in work, and it has overcome defectives such as tandem stabilized voltage power supply volume is big, conversion efficiency is low.
The operation principle of circuit: the circuit of making small-power switching power-supply with NE555 adopts high-power PNP transistor VT1 as the adjustment pipe; Operational amplifier IC2 constitutes comparison amplifier; Time-base circuit IC1 is connected into the stable multi-oscillation circuit.The stable multi-oscillation circuit produces sawtooth voltage on capacitor C 1, the sawtooth wave frequency confirms that by potentiometer RP and capacitor C 1 sawtooth waveforms is delivered to the in-phase input end of comparator among the operational amplifier IC2, and sampling voltage is delivered to the inverting input of comparator.The duty ratio of operational amplifier IC2 output square waveform is controlled by sampling voltage, and when output voltage was a stationary value, sampling voltage was that 1/3 burning voltage is to a certain value between 2/3 burning voltage.When certain reason rose output voltage or descend, sampling voltage rose thereupon or descends, operational amplifier IC2 output square wave duty ratio is reduced or increases, and ON time shortens or increases, output voltage decline or rising, thus reach regulated output voltage.
Technical scheme: make small-power switching power-supply with NE555, be made up of 18V DC power supply, 9V stabilized voltage power supply, stable multi-oscillation circuit, operational amplifier IC2, sample circuit, rectification and electronic filtering circuit, its characteristic comprises:
The stable multi-oscillation circuit: 4 pin of time-base circuit IC1 and 8 pin connect the negative pole of voltage stabilizing didoe DW; 5 pin of time-base circuit IC1 connect an end of capacitor C 1; The 1 pin connection circuit ground GND of the other end of capacitor C 1 and time-base circuit IC1,7 pin of time-base circuit IC1,6 pin and 2 pin connect the in-phase input end of operational amplifier IC2;
The in-phase input end of operational amplifier IC2 connects 2 pin of time-base circuit IC1; The inverting input of operational amplifier IC2 accesses kind lever arm of potentiometer RP; The positive source of operational amplifier IC2 connects the positive pole of 18V DC power supply; The power cathode connection circuit ground GND of operational amplifier IC2, the signal output part of operational amplifier IC2 connects the base stage of PNP transistor VT1;
Sample circuit, rectification and electronic filtering circuit: form by sampling potentiometer RP, PNP transistor VT1, inductance coil L1 and filter capacitor C2; The collector electrode of PNP transistor VT1 connects the positive pole of 18V DC power supply; The emitter of PNP transistor VT1 connects the end of inductance coil L1; The other end of inductance coil L1 accesses the end of kind potentiometer RP and the positive pole of filter capacitor C2, the negative pole connection circuit ground GND of the other end of sampling potentiometer RP and filter capacitor C2.
9V stabilized voltage power supply: form the positive pole of a termination 18V DC power supply of resistance R 1, the negative pole of another termination voltage stabilizing didoe DW of resistance R 1, the anodal connection circuit ground GND of voltage stabilizing didoe DW by 18V DC power supply, resistance R 1 and voltage stabilizing didoe DW.
Description of drawings
Accompanying drawing 1 is that the utility model provides an embodiment circuit working schematic diagram of making small-power switching power-supply with NE555.
Embodiment
According to circuit working schematic diagram and the description of drawings of making small-power switching power-supply shown in the accompanying drawing 1 with NE555; And according to the annexation between the components and parts in the described each several part circuit of utility model content, and the components and parts technical parameter described in the execution mode requires to implement to realize the utility model.
The selection of components and parts and technical parameter thereof
IC1 is a time-base circuit, and model is: NE555, and it is 8 pin DIP encapsulation, each pin function: 1 pin is circuit ground (GND); 2 pin are trigger end; 3 pin outputs; 4 pin preset ends; 5 pin are control voltage; 6 pin thresholdings (threshold value); 7 pin are discharge end; 8 pin connect positive source (VCC);
IC2 is an operational amplifier, and model is selected the F004B of metallic packaging for use, and this circuit has 8 pins;
DW is a voltage stabilizing didoe, voltage stabilizing value 8.5～9.5V, and power is 250mW, model is selected 2CW16 for use;
L1 is an inductance coil, and inductance value is 2.2mH, the operating current >=1500mA of inductance;
VT1 is high-power PNP transistor, and its model is selected 3AD6A for use;
Resistance uses metalfilmresistor or fixed carbon resister, and power is 1/4W, and the resistance of resistance R 1 is 430 Ω; RP is a potentiometer, and its resistance is 3.3k Ω;
C1 is an electric capacity, and its capacity is 1000PF; C2 is a filter capacitor, and its capacity is 470 μ F/25V.
The making main points and the circuit debugging of circuit
Very simple because of the circuit structure of making small-power switching power-supply with NE555, make than be easier to, it is general that the physical connection of components and parts is correct as long as the components and parts performance of use is intact, circuit need not carry out any debugging promptly can operate as normal;
The sawtooth waveforms frequency of oscillation of stable multi-oscillation circuit confirms that by capacitor C 1 capacity of capacitor C 1 is more little, and the frequency of oscillation of sawtooth waveforms is high more, and the power of voltage stabilizing output is big more; The size of adjustment sampling potentiometer RP may command output voltage stabilizing value, the power of generally exporting the high more output of stable voltage is more little; If the power of this Switching Power Supply output is less than normal a bit, can suitably improve the voltage of the dc power supply DC of this Switching Power Supply.
Claims (2)
1. make small-power switching power-supply with NE555 for one kind, be made up of 18V DC power supply, 9V stabilized voltage power supply, stable multi-oscillation circuit, operational amplifier IC2, sample circuit, rectification and electronic filtering circuit, its characteristic comprises:
4 pin of time-base circuit IC1 in the stable multi-oscillation circuit and 8 pin connect the negative pole of voltage stabilizing didoe DW; 5 pin of time-base circuit IC1 connect an end of capacitor C 1; The 1 pin connection circuit ground GND of the other end of capacitor C 1 and time-base circuit IC1,7 pin of time-base circuit IC1,6 pin and 2 pin connect the in-phase input end of operational amplifier IC2;
The in-phase input end of operational amplifier IC2 connects 2 pin of time-base circuit IC1; The inverting input of operational amplifier IC2 accesses kind lever arm of potentiometer RP; The positive source of operational amplifier IC2 connects the positive pole of 18V DC power supply; The power cathode connection circuit ground GND of operational amplifier IC2, the signal output part of operational amplifier IC2 connects the base stage of PNP transistor VT1;
Sample circuit, rectification and electronic filtering circuit are made up of sampling potentiometer RP, PNP transistor VT1, inductance coil L1 and filter capacitor C2; The collector electrode of PNP transistor VT1 connects the positive pole of 18V DC power supply; The emitter of PNP transistor VT1 connects the end of inductance coil L1; The other end of inductance coil L1 accesses the end of kind potentiometer RP and the positive pole of filter capacitor C2, the negative pole connection circuit ground GND of the other end of sampling potentiometer RP and filter capacitor C2.
2. according to claim 1ly make small-power switching power-supply with NE555; It is characterized in that: the 9V stabilized voltage power supply is made up of 18V DC power supply, resistance R 1 and voltage stabilizing didoe DW; The positive pole of one termination 18V DC power supply of resistance R 1; The negative pole of another termination voltage stabilizing didoe DW of resistance R 1, the anodal connection circuit ground GND of voltage stabilizing didoe DW.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200393914U CN202455268U (en) | 2012-02-08 | 2012-02-08 | Small-power switch power supply manufactured by using NE555 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200393914U CN202455268U (en) | 2012-02-08 | 2012-02-08 | Small-power switch power supply manufactured by using NE555 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202455268U true CN202455268U (en) | 2012-09-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012200393914U Expired - Fee Related CN202455268U (en) | 2012-02-08 | 2012-02-08 | Small-power switch power supply manufactured by using NE555 |
Country Status (1)
| Country | Link |
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| CN (1) | CN202455268U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108111153A (en) * | 2017-11-27 | 2018-06-01 | 海宁海微电子科技有限公司 | A kind of radio-frequency switch circuit |
-
2012
- 2012-02-08 CN CN2012200393914U patent/CN202455268U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108111153A (en) * | 2017-11-27 | 2018-06-01 | 海宁海微电子科技有限公司 | A kind of radio-frequency switch circuit |
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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: 20120926 Termination date: 20130208 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |