CN203788173U - Simple and high-efficiency DC voltage-stabilizing power supply used for laboratory - Google Patents
Simple and high-efficiency DC voltage-stabilizing power supply used for laboratory Download PDFInfo
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- CN203788173U CN203788173U CN201420167550.8U CN201420167550U CN203788173U CN 203788173 U CN203788173 U CN 203788173U CN 201420167550 U CN201420167550 U CN 201420167550U CN 203788173 U CN203788173 U CN 203788173U
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Abstract
Provided is a simple and high-efficiency DC voltage-stabilizing power supply used for a laboratory. The DC voltage-stabilizing power supply is composed of a voltage-reducing transformer, a first rectification filter circuit, a +5V voltage-stabilizing circuit, an output voltage coarse adjustment switch, a second rectification filter circuit, a +1.25-28V adjustable voltage-stabilizing circuit, a first soft start circuit, a -1.25-28V adjustable voltage-stabilizing circuit and a second soft start circuit. The connection relationship is shown in the appended drawings. The voltage-stabilizing circuits adopt a three-end integrated voltage stabilizer with great performance. Output voltage is adjusted by adopting a multi-turn precision linear adjustable potentiometer. Low voltage difference control of an adjusting tube is realized by utilizing the voltage coarse adjustment switch, and +5V stable DC voltage and +/-1.25-28V continuous adjustable DC voltage can be outputted simultaneously with the maximum output current of 1.5A. The positive effects of the DC voltage-stabilizing power supply are that the DC voltage-stabilizing power supply is great in voltage stabilization, high in adjusting precision, low in output ripple voltage, simple in circuit, low in fault rate, complete in protective functions and high in efficiency.
Description
Technical field
The utility model relates to D.C. regulated power supply technical field, is specifically related to a kind of simple use for laboratory D.C. regulated power supply efficiently.
Background technology
D.C. regulated power supply is the most frequently used instrument in electrical type laboratory, and adjustable D. C regulated is widely used in the fields such as the maintenance of teaching, scientific research and electronic product.Switching power supply efficiency is high, but ripple voltage is high, and noise is large, circuit complexity, and failure rate is high, and maintenance difficulty is large.Traditional linear direct current regulated power supply advantage is that voltage regulation performance is good, and output ripple voltage is little, and circuit is simple, and failure rate is low is easy to maintenance, and major defect is that the pressure drop of adjustment pipe is larger, and power consumption is high, and the efficiency of stabilized voltage power supply is lower.
Summary of the invention
For solving the deficiency of existing adjustable D. C regulated, the open a kind of simple use for laboratory D.C. regulated power supply efficiently of the utility model.This D.C. regulated power supply is linear direct current regulated power supply, voltage stabilizing circuit adopts the three terminal integrated voltage stabilizer of function admirable, output voltage adopts multi-turn precision linear adjustable potentiometer to regulate, utilize voltage coarse adjustment switch to realize the low voltage difference control of adjusting pipe, can simultaneously export+5V stable DC voltage and the continuously adjustable direct voltage of ± 1.25～28V, maximum output current is all 1.5A.Can be widely used in the field such as the power supply of teaching, scientific research, electronic product and the maintenance of electronic product.
For achieving the above object, the utility model adopts following technical scheme: the utility model is made up of step-down transformer, the first current rectifying and wave filtering circuit ,+5V voltage stabilizing circuit, output voltage coarse adjustment switch, the second current rectifying and wave filtering circuit ,+1.25～28V is adjustable voltage stabilizing circuit, the first soft starting circuit ,-1.25～28V is adjustable voltage stabilizing circuit and the second soft starting circuit.The input winding L of step-down transformer connects 220V electric main, and output winding L 1 connects the input of the first current rectifying and wave filtering circuit; The output of input termination first current rectifying and wave filtering circuit of+5V voltage stabilizing circuit; The output winding L 2 of step-down transformer connects the input of output voltage coarse adjustment switch, the output of the input termination voltage coarse adjustment switch of the second current rectifying and wave filtering circuit; The positive voltage output end of input termination second current rectifying and wave filtering circuit of the adjustable voltage stabilizing circuit of+1.25～28V, output termination the first soft starting circuit; The negative voltage output of input termination second current rectifying and wave filtering circuit of-1.25～28V is adjustable voltage stabilizing circuit circuit, output termination the second soft starting circuit.Can simultaneously export+5V galvanic current is pressed and the continuously adjustable direct voltage of ± 1.25～28V, and maximum output current is all 1.5A.
Good effect of the present utility model is: voltage regulation performance is good, degree of regulation is high, output ripple voltage is little, circuit is simple, failure rate is low, and defencive function is perfect, efficiency is high.
Brief description of the drawings
Fig. 1 is block diagram of the present utility model.
Fig. 2 is circuit theory diagrams of the present utility model.
Embodiment
As shown in Figure 1, the utility model is made up of step-down transformer, the first current rectifying and wave filtering circuit ,+5V voltage stabilizing circuit, output voltage coarse adjustment switch, the second current rectifying and wave filtering circuit ,+1.25～28V is adjustable voltage stabilizing circuit, the first soft starting circuit ,-1.25～28V is adjustable voltage stabilizing circuit and the second soft starting circuit.The input winding L of step-down transformer connects 220V electric main, and output winding L 1 connects the input of the first current rectifying and wave filtering circuit; The output of input termination first current rectifying and wave filtering circuit of+5V voltage stabilizing circuit; The output winding L 2 of step-down transformer connects the input of output voltage coarse adjustment switch, the output of the input termination voltage coarse adjustment switch of the second current rectifying and wave filtering circuit; The positive voltage output end of input termination second current rectifying and wave filtering circuit of the adjustable voltage stabilizing circuit of+1.25～28V, output termination the first soft starting circuit; The negative voltage output of input termination second current rectifying and wave filtering circuit of-1.25～28V is adjustable voltage stabilizing circuit circuit, output termination the second soft starting circuit.Can simultaneously export+5V galvanic current is pressed and the continuously adjustable direct voltage of ± 1.25～28V, and maximum output current is all 1.5A.
As shown in Figure 2.
The input winding L of step-down transformer T connects 220V electric main, and the alternating voltage that output winding L 1 is exported is 8V, and output winding L 2 has centre cap, the alternating voltage of exportable 6V, 10V, 14V, 18V, 22V, six groups of symmetries of 26V.
The 8V alternating voltage that the output winding L 1 of step-down transformer is exported, through the bridge rectifier bridge BD1 of the first current rectifying and wave filtering circuit rectification, the direct voltage of C1, obtain+9.6V of C2 filtering, through the fixing integrated stabilizator CW7805 voltage stabilizing of three ends, C3 filtering, output+5V stable DC voltage, maximum output current is 1.5A.
Output voltage coarse adjustment K switch 1, K2 are double-pole six throw switches, and regulation output voltage coarse adjustment switch can be the second current rectifying and wave filtering circuit 6V, 10V, 14V, 18V, 22V, six kinds of symmetrical alternating voltages of 26V are provided, through rectifier bridge BD2 rectification, C4, C5; C9, obtain+7～31V of C10 filtering and-direct voltage of six kinds of Symmetricals of 7～31V, be respectively+1.25～+ 28V is adjustable voltage stabilizing circuit and the adjustable voltage stabilizing circuit circuit supply of-1.25～28V.When use, can need according to voltage stabilizing circuit the suitable regulation output voltage of the size coarse adjustment switch of output voltage, make the high 3～5V of input voltage specific output voltage of voltage stabilizing circuit, realize the low voltage difference control of adjusting pipe, in the whole output voltage range of adjustable voltage stabilizing circuit, remain high efficiency.
+ 1.25～28V is adjustable voltage stabilizing circuit is by three end adjustable voltage-regulating ic device LM317; filter capacitor C6, C8; output voltage sample resistance R2, multi-turn precision linear adjustable potentiometer RP1 and protection diode D1, D2 composition, adjusting RP1 can be at the linear adjustable direct voltage of obtain+1.25～28V of the output of voltage stabilizing circuit continuous precision.
-1.25～28V is adjustable voltage stabilizing circuit is by three end adjustable voltage-regulating ic device LM337, filter capacitor C11, C13, and output voltage sample resistance R5, multi-turn precision linear adjustable potentiometer RP2 and protection diode D3, D4 composition, regulate RP2
Can be at the linear adjustable direct voltage of obtain-1.25～28V of the output of voltage stabilizing circuit continuous precision.
C6, C11, for improving the Ripple Suppression ratio of voltage stabilizing circuit, reduce the ripple component of output voltage.C8 and C13 are respectively used to prevent LM317 and LM337 issuable self-oscillation under deep negative feedback operation, also can further reduce the ripple component of output voltage.The effect of D1 and D3 is while being respectively used to prevent the input short circuit of voltage stabilizing circuit, and capacitor C 8 and C13 discharge and damage three end adjustable voltage-regulating ic devices.The effect of D2 and D4 is while being respectively used to prevent the output short circuit of voltage stabilizing circuit, and C6 and C11 electric discharge damage three end adjustable voltage-regulating ic devices.In the time of normal work, protection diode D1, D3, D2, D4 are in cut-off state.
The first soft starting circuit is by triode BG1, and resistance R 3, R4 and capacitor C 7 form, and the positive pole of its input C7 connects the output of LM317, and output BG1 collector electrode connects the output voltage adjustable side of LM317.
The second soft starting circuit is by triode BG2, and resistance R 6, R7 and capacitor C 12 form, and the negative pole of its input C12 connects the output of LM337, and the collector electrode of output BG2 connects the output voltage adjustable side of LM337.
The effect of soft starting circuit is to make the output voltage of voltage stabilizing circuit have a uphill process slowly, to adapt to the starting characteristic of perception or capacitive load, prevents from starting excessive damage voltage stabilizing circuit.In the time that mains input voltage is accessed, because capacitor C 7, C12 have larger charging current, all saturation conductions of BG1 and BG2, make the voltage of output voltage adjustable side of pressurizer LM317 and LM337 all very low, therefore output voltage is all very little, along with the charging of C7, C12, the base current of BG1 and BG2 reduces, and its collector potential raises, the output voltage of pressurizer LM317 and LM337 all raises, when C7, C12 charge when complete, BG1 and BG2 end, and output voltage reaches set point.Can adjust start-up time by the value of change and C7, R4 and C12, R7, and C7 and C12 are all designed to 10 μ F by the utility model, and R4 and R7 are designed to 200K Ω, and the time of startup is all 2 seconds.
The D.C. regulated power supply of the utility model design, voltage stabilizing circuit adopts the three terminal integrated voltage stabilizer of function admirable, and output voltage stability is high, and at load current 1A, when input mains fluctuation ± 10%, the regulation of output voltage is 0.05%, and ripple is less than 1mV
p-P, there is overcurrent, input and output short-circuit protection function, utilize voltage coarse adjustment switch to realize the low voltage difference control of adjusting pipe, efficiency when nominal load is greater than 75%, and efficiency is high.
The D.C. regulated power supply of the utility model design, output+5V stable DC voltage can be digital circuit power supply, and the continuously adjustable direct voltage of ± 1.25～28V can be the circuit that amplifier or OCL power amplifier etc. need Symmetrical Power supply.Can be widely used in the field such as the power supply of teaching, scientific research, electronic product and the maintenance of electronic product, have wide market prospects.
Claims (7)
1. a simple use for laboratory D.C. regulated power supply efficiently, is characterized in that: it is made up of step-down transformer, the first current rectifying and wave filtering circuit ,+5V voltage stabilizing circuit, output voltage coarse adjustment switch, the second current rectifying and wave filtering circuit ,+1.25～28V is adjustable voltage stabilizing circuit, the first soft starting circuit ,-1.25～28V is adjustable voltage stabilizing circuit and the second soft starting circuit; The input winding L of step-down transformer connects 220V electric main, and output winding L 1 connects the input of the first current rectifying and wave filtering circuit; The output of input termination first current rectifying and wave filtering circuit of+5V voltage stabilizing circuit; The output winding L 2 of step-down transformer connects the input of output voltage coarse adjustment switch, the output of the input termination voltage coarse adjustment switch of the second current rectifying and wave filtering circuit; The positive voltage output end of input termination second current rectifying and wave filtering circuit of the adjustable voltage stabilizing circuit of+1.25～28V, output termination the first soft starting circuit; The negative voltage output of input termination second current rectifying and wave filtering circuit of-1.25～28V is adjustable voltage stabilizing circuit circuit, output termination the second soft starting circuit, can simultaneously export+5V galvanic current is pressed and the continuously adjustable direct voltage of ± 1.25～28V, and maximum output current is all 1.5A.
2. the simple use for laboratory D.C. regulated power supply efficiently of one according to claim 1, it is characterized in that: the input winding L of step-down transformer connects 220V electric main, the alternating voltage that output winding L 1 is exported is 8V, output winding L 2 has centre cap, the alternating voltage of exportable 6V, 10V, 14V, 18V, 22V, six groups of symmetries of 26V.
3. the simple use for laboratory D.C. regulated power supply efficiently of one according to claim 1, is characterized in that: output voltage coarse adjustment K switch 1, K2 are double-pole six throw switches.
4. the simple use for laboratory D.C. regulated power supply efficiently of one according to claim 1; it is characterized in that :+1.25～28V is adjustable voltage stabilizing circuit is by three end adjustable voltage-regulating ic device LM317; filter capacitor C6, C8, output voltage sample resistance R2, multi-turn precision linear adjustable potentiometer RP1 and protection diode D1, D2 composition.
5. the simple use for laboratory D.C. regulated power supply efficiently of one according to claim 1; it is characterized in that :-1.25～28V is adjustable voltage stabilizing circuit is by three end adjustable voltage-regulating ic device LM337; filter capacitor C11, C13, output voltage sample resistance R5, multi-turn precision linear adjustable potentiometer RP2 and protection diode D3, D4 composition.
6. the simple use for laboratory D.C. regulated power supply efficiently of one according to claim 1, it is characterized in that: the first soft starting circuit is by triode BG1, resistance R 3, R4 and capacitor C 7 form, the positive pole of its input C7 connects the output of LM317, and output BG1 collector electrode connects the output voltage adjustable side of LM317.
7. the simple use for laboratory D.C. regulated power supply efficiently of one according to claim 1, it is characterized in that: the second soft starting circuit is by triode BG2, resistance R 6, R7 and capacitor C 12 form, the negative pole of its input C12 connects the output of LM337, and the collector electrode of output BG2 connects the output voltage adjustable side of LM337.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420167550.8U CN203788173U (en) | 2014-04-09 | 2014-04-09 | Simple and high-efficiency DC voltage-stabilizing power supply used for laboratory |
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| CN201420167550.8U CN203788173U (en) | 2014-04-09 | 2014-04-09 | Simple and high-efficiency DC voltage-stabilizing power supply used for laboratory |
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| CN203788173U true CN203788173U (en) | 2014-08-20 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103887994A (en) * | 2014-04-09 | 2014-06-25 | 张新安 | Simple and efficient direct-current voltage-stabilized source for laboratory |
| CN104393760A (en) * | 2014-11-27 | 2015-03-04 | 中国兵器工业集团第二一四研究所苏州研发中心 | Positive-negative output low dropout adjusting circuit with short-circuit protection function |
| CN106059266A (en) * | 2016-08-03 | 2016-10-26 | 南京理工大学 | Power supply and distribution module applied to CubeSat |
| CN108196157A (en) * | 2018-01-29 | 2018-06-22 | 昆明理工大学 | The parameter and failure detector and method of a kind of current sensor module |
| CN112737359A (en) * | 2020-12-24 | 2021-04-30 | 中航贵州飞机有限责任公司 | Constant-voltage constant-current direct-current high-power adjustable power supply module |
-
2014
- 2014-04-09 CN CN201420167550.8U patent/CN203788173U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103887994A (en) * | 2014-04-09 | 2014-06-25 | 张新安 | Simple and efficient direct-current voltage-stabilized source for laboratory |
| CN104393760A (en) * | 2014-11-27 | 2015-03-04 | 中国兵器工业集团第二一四研究所苏州研发中心 | Positive-negative output low dropout adjusting circuit with short-circuit protection function |
| CN106059266A (en) * | 2016-08-03 | 2016-10-26 | 南京理工大学 | Power supply and distribution module applied to CubeSat |
| CN106059266B (en) * | 2016-08-03 | 2019-03-05 | 南京理工大学 | A kind of power supply power entry module applied to cube star |
| CN108196157A (en) * | 2018-01-29 | 2018-06-22 | 昆明理工大学 | The parameter and failure detector and method of a kind of current sensor module |
| CN112737359A (en) * | 2020-12-24 | 2021-04-30 | 中航贵州飞机有限责任公司 | Constant-voltage constant-current direct-current high-power adjustable power supply module |
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| Date | Code | Title | Description |
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| 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: 20140820 Termination date: 20150409 |
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| EXPY | Termination of patent right or utility model |