CN202906767U - Switching power supply with continuously adjustable output voltage - Google Patents
Switching power supply with continuously adjustable output voltage Download PDFInfo
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- CN202906767U CN202906767U CN 201220440548 CN201220440548U CN202906767U CN 202906767 U CN202906767 U CN 202906767U CN 201220440548 CN201220440548 CN 201220440548 CN 201220440548 U CN201220440548 U CN 201220440548U CN 202906767 U CN202906767 U CN 202906767U
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Abstract
A switching power supply with continuously adjustable output voltage comprises an input rectifier and filter circuit, a transformer and a reactive circuit. One end of the input rectifier and filter circuit is connected with a power supply, the other end of the input rectifier and filter circuit is connected with an input end of the transformer, the input end and an output end of the transformer are connected through the reactive circuit. The reactive circuit comprises an integrated chip U1, an optoelectronic coupler U2, a resistor R9 and a voltage stabilization reference source U3, wherein the resistor R9 is a slide rheostat. Different sampling resistors are accessed by changing accessing resistance value of the R9 further to adjust the input signal duty factor of a primary coil of a transformer circuit, and thus the continuous adjustment of output voltage is realized. Compared with the prior art, the switching power supply has beneficial effects that: the switching power supply replaces a toggle switch and a sampling resistor in the prior art with the slide rheostat, the output voltage of the switching power supply is realized to be freely adjusted within 3 V-6 V, and a product is enabled to meet requirements of a client better.
Description
Technical field
The utility model relates to electricity field, is specifically related to the continuously adjustable Switching Power Supply of a kind of energy-efficient output voltage.
Background technology
In the industry, (for example AC100V～AC240V), extra low voltage output (for example 3V voltage), to require the continuously adjustable Switching Power Supply of output voltage be very difficult to develop the input of large alternating voltage.
According to existing technology, design such power supply has two kinds of methods: the one, adopt the high frequency switch power scheme of present comparative maturity, and three end adjustable shunt reference sources of this scheme dependence output provide feedback, thereby can regulated output voltage; Another kind method is to select sampling resistor in shunt reference source reference voltage terminal access parallel resistance series by toggle switch, thereby change the output voltage of Switching Power Supply, but this kind method output voltage can only be several finite values of fixing, and is limited to the Test Application effect.And only have two kinds according to three end adjustable shunt reference sources commonly used on the present market, minimum benchmark output voltage is respectively 1.25V and 2.5V, we are a reference source of 1.25V with minimum benchmark, if link to each other with toggle switch 3 resistance are arranged, Switching Power Supply can only be exported three fixing magnitudes of voltage so, the client needs more output voltage values, and present Power Management Design scheme just can not meet the demands.
The utility model content
In order to address the above problem, the utility model provides a kind of output voltage energy-efficient, simple in structure continuously adjustable Switching Power Supply.
The utility model solves by the following technical solutions:
The continuously adjustable Switching Power Supply of a kind of output voltage, comprise the input rectifying filter circuit, transformer, output rectifier and filter, feedback circuit, described input rectifying filter circuit one termination power, the other end is connected input and is connected with transformer, connect by feedback circuit between described transformer input and the output, described feedback circuit comprises integrated chip U1, photoelectrical coupler U2, resistance R 9, voltage stabilizing a reference source U3, wherein resistance R 9 is slide rheostats, 4 source lead of described integrated chip U1 connect, the bypass pin is connected the induction output of photoelectrical coupler U2 with feedback pin, integrated chip U1 drain lead is positive output end and the negative output terminal of connection transformer simultaneously, the positive output end of the anodal connection transformer of the photodiode of the input of photoelectrical coupler U2, the negative pole of photodiode connects the negative electrode of voltage stabilizing a reference source U3, slide rheostat R9 two ends are positive output end and the ground of connection transformer respectively, voltage stabilizing a reference source U3 plus earth, the sliding end of slide rheostat is connected with the reference edge of voltage stabilizing a reference source, and the negative electrode of voltage stabilizing a reference source U3 and the positive output end of transformer are connected.
Be connected with the bypass pin after 4 source lead of described integrated chip U1 connect, between source lead and the bypass pin filter capacitor C4 arranged.
Be connected to divider resistance R4 between the positive pole of the photodiode of the induction input of described photoelectrical coupler U2 and the transformer positive output end, be connected to divider resistance R8 between negative pole and the transformer positive output end.
Be connected to divider resistance R6 between described slide rheostat R9 and the transformer positive output end.
Described integrated chip U1 model is LNK363.
Compared with prior art, the beneficial effects of the utility model are: the utility model replaces toggle switch in the prior art and sampling resistor with slide rheostat, realize that switch power source output voltage from adjustable arbitrarily between 3V～36V, makes product can satisfy better client's demand.
Description of drawings
The continuously adjustable switching power circuit principle schematic of a kind of output voltage of Fig. 1 the utility model.
Embodiment
Defective for prior art exists is described in further detail of the present utility model for the ease of it will be appreciated by those skilled in the art that below in conjunction with accompanying drawing:
Understanding for the ease of those skilled in the art is described in further detail the utility model below in conjunction with accompanying drawing:
As shown in Figure 1, the continuously adjustable Switching Power Supply of described a kind of output voltage comprises input rectifying filter circuit 1, transformer 2, feedback circuit 3 and output rectifier and filter.
Each the electric circuit constitute is as follows: input rectifying filter circuit 1 is comprised of diode D1 ~ D4, capacitor C 1 ~ C2, inductance L 1, and wherein diode D1 ~ D4 consists of bridge rectifier, and capacitor C 1 ~ C2, inductance L 1 consist of filter circuit; Transformer 2 is comprised of diode D5, resistance R 1, resistance R 2, capacitor C 3, coupled inductor T; Output rectifier and filter is comprised of diode D7, capacitor C 5 ~ C6, and diode D7 plays rectified action, and capacitor C 5 ~ C6 consists of filter circuit; Feedback circuit 3 is by integrated chip U1, photoelectrical coupler U2, resistance R 4, resistance R 6, resistance R 8, resistance R 9, voltage stabilizing a reference source U3, capacitor C 4 form, wherein resistance R 9 is slide rheostats, realize the access of different sampling resistors and then regulate transformer circuit primary coil input signal duty ratio by the access resistance that changes resistance R 9, realize the continuous adjusting of output voltage.
Integrated chip U1 model is LNK363, a low-power consumption switch I C, integrated high-voltage power MOSFET, oscillator, ON/OFF control circuit, high-voltage switch gear current source, frequency jitter circuit, Cycle by Cycle current limliting and hot breaking circuit in it, power when startup and work is directly produced by the MOSFET drain lead, need not to use biasing winding and interlock circuit.
The a reference source of voltage stabilizing described in the embodiment adopts three end adjustable shunt reference source U3.
The operation principle of the continuously adjustable Switching Power Supply of output voltage is as follows: when slide rheostat R9 slides, because the resistance ratio at resistance R 6 and resistance R 9 two ends changes, cause the reference edge current potential of voltage stabilizing a reference source to change, and then cause the photodiode voltage of the input of photoelectrical coupler U2 to change, feeding back to integrated chip U1 changes its output signal duty ratio, transformer circuit primary coil input signal duty ratio changes, and has realized the variation of transformer output voltage.And resistance of the every variation of slide rheostat R9, just corresponding transformer output voltage, thus realize a continuously adjustable switch power source function of output voltage.
The above embodiment has only expressed execution mode of the present utility model, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the utility model claim.Should be pointed out that for the person of ordinary skill of the art without departing from the concept of the premise utility, can also make some distortion and improvement, these all belong to protection range of the present utility model.
Claims (5)
1. continuously adjustable Switching Power Supply of output voltage, comprise input rectifying filter circuit (1), transformer (2), feedback circuit (3), one termination power of described input rectifying filter circuit (1), the other end is connected 2 with transformer) input connect, connect by feedback circuit between the input of described transformer (2) and the output, it is characterized in that: described feedback circuit (3) comprises integrated chip U1, photoelectrical coupler U2, resistance R 9, voltage stabilizing a reference source U3, wherein resistance R 9 is slide rheostats, 4 source lead of described integrated chip U1 connect, the bypass pin is connected the induction output of photoelectrical coupler U2 with feedback pin, the drain lead of integrated chip U1 is positive output end and the negative output terminal of connection transformer simultaneously, the positive output end of the anodal connection transformer of the photodiode of the input of photoelectrical coupler U2, the negative pole of photodiode connects the negative electrode of voltage stabilizing a reference source U3, slide rheostat R9 two ends are positive output end and the ground of connection transformer respectively, voltage stabilizing a reference source U3 plus earth, the sliding end of slide rheostat is connected with the reference edge of voltage stabilizing a reference source, and the negative electrode of voltage stabilizing a reference source U3 and the positive output end of transformer are connected.
2. the continuously adjustable Switching Power Supply of a kind of output voltage according to claim 1 is characterized in that: be connected with the bypass pin after 4 source lead of described integrated chip U1 connect, between source lead and the bypass pin filter capacitor C4 arranged.
3. the continuously adjustable Switching Power Supply of a kind of output voltage according to claim 1, it is characterized in that: be connected to divider resistance R4 between the positive pole of the photodiode of the induction input of described photoelectrical coupler U2 and the transformer positive output end, be connected to divider resistance R8 between negative pole and the transformer positive output end.
4. the continuously adjustable Switching Power Supply of a kind of output voltage according to claim 1 is characterized in that: be connected to divider resistance R6 between described slide rheostat R9 and the transformer positive output end.
5. the continuously adjustable Switching Power Supply of a kind of output voltage according to claim 1, it is characterized in that: described integrated chip U1 model is LNK363.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220440548 CN202906767U (en) | 2012-08-31 | 2012-08-31 | Switching power supply with continuously adjustable output voltage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220440548 CN202906767U (en) | 2012-08-31 | 2012-08-31 | Switching power supply with continuously adjustable output voltage |
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| Publication Number | Publication Date |
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| CN202906767U true CN202906767U (en) | 2013-04-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220440548 Expired - Fee Related CN202906767U (en) | 2012-08-31 | 2012-08-31 | Switching power supply with continuously adjustable output voltage |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103326577A (en) * | 2013-07-11 | 2013-09-25 | 台达电子电源(东莞)有限公司 | Regulating equipment for output voltage of switching power supply, regulating method and integrated chip |
| CN104183343A (en) * | 2014-07-15 | 2014-12-03 | 常州大学 | Current sampling resistor and regulation method of same of large-current driving motor |
| CN104300779A (en) * | 2014-10-21 | 2015-01-21 | 陕西华经微电子股份有限公司 | DC/DC converter with output voltage and regulating voltage meeting equation y=kx+b |
| CN105720836A (en) * | 2016-04-25 | 2016-06-29 | 南昌大学 | Rectifier circuit |
| WO2023155260A1 (en) * | 2022-02-18 | 2023-08-24 | 长鑫存储技术有限公司 | Power supply circuit |
-
2012
- 2012-08-31 CN CN 201220440548 patent/CN202906767U/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103326577A (en) * | 2013-07-11 | 2013-09-25 | 台达电子电源(东莞)有限公司 | Regulating equipment for output voltage of switching power supply, regulating method and integrated chip |
| CN103326577B (en) * | 2013-07-11 | 2015-09-02 | 台达电子电源(东莞)有限公司 | The conditioning equipment of switch power source output voltage, method of adjustment and integrated chip |
| TWI501517B (en) * | 2013-07-11 | 2015-09-21 | Delta Electronics Power Dong Guan Co Ltd | Regulating apparatus for output voltage of switched-mode power supply, adjusting method, and integrated chip |
| US9618585B2 (en) | 2013-07-11 | 2017-04-11 | Delta Electronics Power (Dong Guan) Co., Ltd. | Adjusting device of an output voltage of a switch power supply, an adjusting method thereof and an integrated chip |
| CN104183343A (en) * | 2014-07-15 | 2014-12-03 | 常州大学 | Current sampling resistor and regulation method of same of large-current driving motor |
| CN104300779A (en) * | 2014-10-21 | 2015-01-21 | 陕西华经微电子股份有限公司 | DC/DC converter with output voltage and regulating voltage meeting equation y=kx+b |
| CN104300779B (en) * | 2014-10-21 | 2017-07-21 | 陕西华经微电子股份有限公司 | Output voltage meets the DC/DC converters of y=kx+b relations with regulation voltage |
| CN105720836A (en) * | 2016-04-25 | 2016-06-29 | 南昌大学 | Rectifier circuit |
| CN105720836B (en) * | 2016-04-25 | 2019-05-24 | 南昌大学 | A kind of rectification circuit |
| WO2023155260A1 (en) * | 2022-02-18 | 2023-08-24 | 长鑫存储技术有限公司 | Power supply 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: 20130424 Termination date: 20190831 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |