CN202634269U - Low-voltage wide-range input power circuit - Google Patents
Low-voltage wide-range input power circuit Download PDFInfo
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- CN202634269U CN202634269U CN 201220316553 CN201220316553U CN202634269U CN 202634269 U CN202634269 U CN 202634269U CN 201220316553 CN201220316553 CN 201220316553 CN 201220316553 U CN201220316553 U CN 201220316553U CN 202634269 U CN202634269 U CN 202634269U
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Abstract
The utility model discloses a low-voltage wide-range input power circuit which utilizes a non-isolation pulse width modulation (PWM) voltage-reduction method. The low-voltage wide-range input power circuit mainly comprises an input rectifying filter circuit (1), a closed-loop feedback pulse width control circuit (2) and an output filter circuit (3), and is characterized in that PWM equivalent voltage reduction is directly carried out on input voltage, a traditional transformer is not needed, the low-voltage wide-range input power circuit is small in size, high in efficiency, high in response speed and low in cost, and extra-wide voltage input of alternating current of 18-265 volts or direct current of 24-380 volts can be achieved under the condition that alternating current can be output stably. The low-voltage wide-range input power circuit is widely applied to power supply to low-power equipment under the conditions of large voltage fluctuation and low service voltage.
Description
Technical field
The utility model can be widely used in the small-power power supply occasion of the ultra wide supply districts of needs such as various household electrical appliance, control system, power equipment and Medical Instruments.
Background technology
Progress along with science and technology; Various new-type electric equipments emerge in large numbers like the mushrooms after rain, and these equipment often insert in different electric power systems, and various electric power system voltage differences are very big; Low to tens volts; High to two or three hectovolt, and power supply often has big voltage fluctuation, and the conventional linear transformer can't satisfy the demands.A kind of super wide voltage adaptive power supply is disclosed in Chinese utility model patent CN200720124415.5; This power supply can be adjusted to the input minimum voltage and exchange 85V; But in some field; Need input voltage is lower and power transmission range is wider power supply adapting to the user demand of different electric equipments, such as: zones of different high-low pressure power supply etc. on reserve power supply, AC/DC universal circuit, the equipment; This moment, minimum input voltage just seemed powerless for the power supply that exchanges 85V, and it is wide and can adapt to the power circuit of low-voltage input therefore to be necessary to develop a kind of input voltage range, also possesses the characteristic of AC/DC universal simultaneously.
Summary of the invention
To the deficiency of above-mentioned prior art, the utility model provides a kind of input voltage range for exchanging 18 ~ 265 volts, the low-voltage wide region power supply circuit that equivalent compatible direct current is 24 ~ 380 volts.
The utility model solves its technical problem; The technical scheme that is adopted is: a kind of power circuit of low-voltage wide region input; Form by input rectifying filter circuit, close-loop feedback pulse width control circuit and output filter circuit, it is characterized in that: the input rectifying filter circuit of step voltage before EMC filter circuit and current rectifying and wave filtering circuit are composed in series; Pwm control circuit is connected with the LC filter circuit, composes in parallel the close-loop feedback pulse width control circuit with the close-loop feedback circuit again; Smoothed filter circuit and overload protecting circuit be composed in series output filter circuit.
EMC filtering is carried out through the filter circuit of being made up of safety capacitor C 7, semistor RT1, common mode filtering inductance L 2, piezo-resistance RV1 in power supply input back; Carry out rectification through rectifier bridge U2 again, send into the pin Vcc (1 pin) of pulse width control chip U3 through capacitor C 8 once more after the filtering; Pulse width control chip U3 and peripheral circuit thereof are formed the pwm control circuit (2-1) in the close-loop feedback pulse width control circuit (2).The circuit that diode D1, resistance R 2, capacitor C 1 and inductance L 1 are formed can be pulse width control chip U3 provides the self-powered that powers on; Optocoupler U1, clamping diode TVS1, resistance R 1, capacitor C 2 are formed the close-loop feedback circuit; Capacitor C 6 is formed smoothed filter circuit with resistance R 3, triode T1.
This circuit working principle is 18 ~ 265 volts of input input ACs, or behind 24 ~ 380 volts of voltages of direct current, carries out rectifying and wave-filtering through input rectifying filter circuit (1).After signal after the rectification carried out pwm control circuit (2-1) pulse-width modulation, by pin GND (8 pin) output of pulse width control chip U3, and output voltage was a square-wave signal; Again through exporting by two-way respectively after the LC filter circuit filtering of forming by inductance L 1, capacitor C 3 ~ 5; The close-loop feedback circuit (2-3) be made up of resistance R 1, optocoupler U1, clamping diode TVS1, capacitor C 2 of leading up to feeds back to output voltage the pin FB (4 pin) of pulse width control chip U3; Pulse width control chip U3 adjusts the duty ratio of pin GND (8 pin) output square wave through feedback voltage, thereby reaches the purpose of adjustment output voltage; The smoothed filter circuit that the triode T1, resistance R 3, capacitor C 6 of leading up in addition forms carries out filtering once more, further reduces the ripple of output voltage, finally exports stable voltage.
Compared with prior art, the beneficial effect of the utility model is:
(1) use of this circuit can realize the super wide range input of low-voltage, and the range expansion of input voltage is to exchanging 18 ~ 265V, and the small-power power supply occasion that is particularly useful for ultra wide supply district is used.
(2) adopt pulse width control chip U3 to realize the core of input voltage regulation having replaced the use of transformer, make equipment miniaturization more, stabilisation as circuit.
Description of drawings
Below in conjunction with accompanying drawing and specific embodiment the utility model is explained further details.
Fig. 1 is the utility model circuit frame figure
Fig. 2 is the utility model circuit theory diagrams
Embodiment
The utility model physical circuit is made up of input rectifying filter circuit (1), close-loop feedback pulse width control circuit (2) and (3) three parts of output filter circuit.The input rectifying filter circuit (1) of step voltage before EMC filter circuit (1-1) is composed in series with current rectifying and wave filtering circuit (1-2).Wherein EMC filter circuit (1-1) is made up of the safety capacitor C 7 that can eliminate the input voltage burr, semistor RT1, common mode filtering inductance L 2, pressure-sensitive protective resistance RV1.When circuit produced fault or other any element and short circuit occurs, semistor RT1 made that the power on resistance R T1 becomes very big because transcient short circuit time produces very big electric current, and simultaneous temperature raises.Because resistance R T1 is a semistor, its resistance can become very big when temperature is too high, thereby plays the effect of open circuit, can effectively protect subsequent conditioning circuit; After circuit recovered normally, resistance R T1 returned to initial condition.After rectifier bridge U2, capacitor C 8 are accomplished the rectifying and wave-filtering of voltage, output dc voltage.Direct voltage is delivered to the pin D (5 pin) of pulse width control chip U3 again.Pulse width control chip U3 model is NCP1012, is a kind of low-power consumption off-line type pulse width control chip, in entire circuit, mainly plays the effect of PWM control.When the pin D of pulse width control chip U3 (5 pin) switches on moment; Pulse width control chip U3 internal current source can be passed through the electric current of 8 milliamperes of pin GND (8 pin) outputs, and electric current gives capacitor C 1 charging through the self-powered circuit of being made up of inductance L 1, diode D1, resistance R 2 that powers on.When capacitor C 1 voltage reaches pulse width control chip U3 operating voltage promptly 8.5 volts the time; Pulse width control chip U3 gets into normal operating conditions; The pin GND of pulse width control chip U3 (8 pin) stops output current; Internal circuit wakes up automatically, and activation pulse width control chip U3 makes it begin operate as normal.Close-loop feedback circuit (2-3) is by linear optical coupling U1, clamping diode TVS1, and resistance R 1, capacitor C 2 is formed.When pin GND (8 pin) output square-wave signal among the pulse width control chip U3 and the smooth dc voltage that obtains after through inductance L 1, capacitor C 3, C4, C5 filtering be the output voltage of LC filter circuit (2-2); When surpassing clamping diode TVS1 puncture voltage; Linear optical coupling U1 increases the electric current of optocoupler transmitting terminal along with the increase of output voltage; Reduce at optocoupler receiving terminal dynamic electric resistor accordingly; Thereby dynamically adjust the pin FB (4 pin) of pulse width control chip U3 and the voltage between the pin GND (8 pin), finally adjust the pulse duration of pin GND (8 pin) output voltage.This voltage pulse output carries out filtering through LC filter circuit 2-2 once more, and equivalent step-down obtains direct voltage comparatively stably.Pass through afterwards by triode T1, resistance R 3, capacitor C 6 is formed smoothed filter circuit (3-1), reduces the ripple of BUCK reduction voltage circuit with this.Output voltage is pressed through the final output in overload protecting circuit (3-2) back galvanic current through smoothed filter circuit (3-1) filtering again.
Claims (2)
1. the power circuit of low-voltage wide region input; Comprise input rectifying filter circuit (1), close-loop feedback pulse width control circuit (2), output filter circuit (3), it is characterized in that: the input rectifying filter circuit (1) of step voltage before EMC filter circuit (1-1) is composed in series with current rectifying and wave filtering circuit (1-2); Pwm control circuit (2-1) is connected with LC filter circuit (2-2), composes in parallel close-loop feedback pulse width control circuit (2) with close-loop feedback circuit (2-3) again; Smoothed filter circuit (3-1) and overload protecting circuit (3-2) be composed in series output filter circuit (3).
2. the power circuit of low-voltage wide region input according to claim 1; It is characterized in that: in the close-loop feedback pulse width control circuit (2) resistance (R1), clamping diode (TVS1), linear optical coupling (U1) with being connected of electric capacity (C2) linear feedback is carried out in the output of pulse width control chip (U3), and to pulse width control chip (U3) starting resistor is provided by electric capacity (C1), resistance (R2), inductance (L1) and diode (D1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220316553 CN202634269U (en) | 2012-07-03 | 2012-07-03 | Low-voltage wide-range input power circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220316553 CN202634269U (en) | 2012-07-03 | 2012-07-03 | Low-voltage wide-range input power circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202634269U true CN202634269U (en) | 2012-12-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220316553 Expired - Lifetime CN202634269U (en) | 2012-07-03 | 2012-07-03 | Low-voltage wide-range input power circuit |
Country Status (1)
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| CN (1) | CN202634269U (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103595269A (en) * | 2013-11-18 | 2014-02-19 | 合肥美的电冰箱有限公司 | Refrigeration equipment and power source used for control system of refrigeration equipment |
| CN104104227A (en) * | 2014-07-18 | 2014-10-15 | 合肥美的电冰箱有限公司 | Non-isolated power supply for refrigerator main control panel, refrigerator main control panel and refrigerator |
| CN104467420A (en) * | 2014-12-04 | 2015-03-25 | 洛阳市黄河软轴控制器股份有限公司 | Voltage stabilizing circuit of switching power supply |
| CN104778943A (en) * | 2014-01-13 | 2015-07-15 | 严国嶂 | Improved mining explosion-proof electronic horn |
| CN105790560A (en) * | 2016-03-21 | 2016-07-20 | 成都天进仪器有限公司 | Power supply circuit applied to relay protection testing device for smart power grid transformer substation |
| CN105932892A (en) * | 2016-05-31 | 2016-09-07 | 中国电子科技集团公司第四十研究所 | Input-output common ground based high-voltage adjustable step-down circuit |
-
2012
- 2012-07-03 CN CN 201220316553 patent/CN202634269U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103595269A (en) * | 2013-11-18 | 2014-02-19 | 合肥美的电冰箱有限公司 | Refrigeration equipment and power source used for control system of refrigeration equipment |
| CN104778943A (en) * | 2014-01-13 | 2015-07-15 | 严国嶂 | Improved mining explosion-proof electronic horn |
| CN104104227A (en) * | 2014-07-18 | 2014-10-15 | 合肥美的电冰箱有限公司 | Non-isolated power supply for refrigerator main control panel, refrigerator main control panel and refrigerator |
| CN104467420A (en) * | 2014-12-04 | 2015-03-25 | 洛阳市黄河软轴控制器股份有限公司 | Voltage stabilizing circuit of switching power supply |
| CN105790560A (en) * | 2016-03-21 | 2016-07-20 | 成都天进仪器有限公司 | Power supply circuit applied to relay protection testing device for smart power grid transformer substation |
| CN105932892A (en) * | 2016-05-31 | 2016-09-07 | 中国电子科技集团公司第四十研究所 | Input-output common ground based high-voltage adjustable step-down circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20161111 Address after: Keyuan Road in Wenjiang District of Chengdu City, Sichuan Province, No. 589 610000 Patentee after: Chengdu AI laiensi Electric Co.,Ltd. Address before: Qingyang District of Chengdu City, 610091 West Rui Sichuan province No. 66 Patentee before: CHENGDU RELIANCE ELECTRIC Co.,Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20121226 |