CN208971130U - A kind of power circuit of anti-AC over-and under-voltage - Google Patents
A kind of power circuit of anti-AC over-and under-voltage Download PDFInfo
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- CN208971130U CN208971130U CN201821700869.7U CN201821700869U CN208971130U CN 208971130 U CN208971130 U CN 208971130U CN 201821700869 U CN201821700869 U CN 201821700869U CN 208971130 U CN208971130 U CN 208971130U
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Abstract
The utility model discloses a kind of power circuits of anti-AC over-and under-voltage, the power circuit includes AC input, rectifying and wave-filtering, isolating transformer, constant pressure and flow control unit, PWM drive control unit, starting and detection control unit, switching tube is provided between the AC input and the rectifying and wave-filtering, the switching tube is connect with detection control unit, the output end of the rectifying and wave-filtering is electrically connected with isolating transformer and starting respectively, it is described to start the input terminal for being electrically connected to PWM drive control unit, the PWM drive control unit manages the switch work of isolating transformer armature winding processed by HF switch, the real-time voltage of the isolating transformer feeds back to PWM drive control unit by feeding back power supply, the output end of the output rectification filter is electrically connected to constant pressure and flow control unit.The utility model can control the start and stop of working power, caused damaged products, improve product reliability when effectively avoiding input supply voltage too high or too low by judging the height of input voltage.
Description
Technical field
The utility model relates to power circuit technical field, specially a kind of power circuit of anti-AC over-and under-voltage.
Background technique
Current Switching Power Supply voltage rating is usually 100-240V, and operating voltage range is usually 90-264V, but by
In the unstability (loss in such as transmission process) of alternating current, voltage is possible to not in this range, especially in backwardness
Country, the stability of power grid are excessively poor (such as India), it is possible to and for input voltage as low as only 70V, what is had is even lower, if
Power supply works long hours at this moment, that temperature will be very high, and it is easy to appear safety accidents.It is also possible to the voltage of input
Height is even higher to 300V, if voltage be raised to it is so high, voltage after rectification circuit of voltage of that input be multiplied by
1.414 times, reform into 424V.Because the primary capacitor of power supply is typically all 400V withstanding voltage, when voltage is more than specified model
When enclosing, it would be possible to that electrolytic capacitor explosion occurs, so as to cause security risk.
Utility model content
The purpose of this utility model is to provide a kind of power circuits of anti-AC over-and under-voltage, can be by judging input voltage
Height, control the start and stop of working power, caused damaged products when effectively avoiding input supply voltage too high or too low, improve
The advantages of product reliability, solve the problems, such as that above-mentioned technical background is proposed.
To achieve the above object, the utility model provides the following technical solutions: a kind of power circuit of anti-AC over-and under-voltage,
The power circuit includes AC input, rectifying and wave-filtering, isolating transformer, constant pressure and flow control unit, PWM drive control list
Member, starting and detection control unit are provided with switching tube, the switching tube and inspection between the AC input and the rectifying and wave-filtering
Control unit connection is surveyed, the output end of the rectifying and wave-filtering is electrically connected with isolating transformer and starting respectively, and the starting is electrically connected
It is connected to the input terminal of PWM drive control unit, at the beginning of the PWM drive control unit manages isolating transformer processed by HF switch
The switch work of grade winding, the real-time voltage of the isolating transformer feed back to PWM drive control unit by feeding back power supply, and
Isolating transformer will couple energy and be transferred to output loading power supply, the output of the output rectification filter by output rectification filter
End is electrically connected to constant pressure and flow control unit, and the constant pressure and flow control unit is used for the Current Voltage of detection circuit, and passes through
Isolation feedback signal back gives PWM drive control unit.
Preferably, the power circuit further includes having detection resistance, and the detection resistance is connect with detection control unit.
Preferably, the detection control unit is PIC single chip microcomputer, model PIC16F877.
Preferably, the PWM drive control unit is power supply IC, model FAN6920MR.
Compared with prior art, the beneficial effects of the utility model are as follows:
The utility model is first passed through when inputting AC electricity by increasing switching tube and detection control unit two parts
Detection control unit removes to judge input voltage whether within specified voltage range, if it is just control is opened in rated range
Close pipe and be attracted conducting, to circuit power supply behind rectifying and wave-filtering, if detect during the work time input voltage be over-voltage or
When under-voltage, pipe is turned off the switch at once, the circulation of circuit is cut away, achievees the purpose that safeguard protection, is avoided because network voltage is unstable
Surely some security risks caused.
Detailed description of the invention
Fig. 1 is the principles of the present invention block diagram；
Fig. 2 is the circuit diagram of the utility model.
Appended drawing reference and title in figure is as follows:
1, AC input；2, switching tube；3, rectifying and wave-filtering；4, isolating transformer；5, output rectification filter；6, constant pressure and constant flow control
Unit processed；7, feedback signal is isolated；8, PWM drive control unit；9 HF switch pipes；10, start；11, detection control unit；
12, feedback power supply；13, detection resistance.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
Every other embodiment obtained, fall within the protection scope of the utility model.
Referring to Fig. 1, a kind of embodiment provided by the utility model: a kind of power circuit of anti-AC over-and under-voltage, it is described
Power circuit includes AC input 1, rectifying and wave-filtering 3, isolating transformer 4, constant pressure and flow control unit 6, PWM drive control unit
8, starting 10 and detection control unit 11, are provided with switching tube 2, the switch between the AC input 1 and the rectifying and wave-filtering 3
Pipe 2 is connect with detection control unit 11, and the output end of the rectifying and wave-filtering 3 is electrically connected with isolating transformer 4 and starting 10 respectively,
The starting 10 is electrically connected to the input terminal of PWM drive control unit 8, and the PWM drive control unit 8 passes through HF switch pipe
The real-time voltage of the switch work of 9 control 4 armature windings of isolating transformer, the isolating transformer 4 is anti-by feedback power supply 12
It feeds PWM drive control unit 8, and isolating transformer 4 will couple energy and be transferred to output loading by output rectification filter 5 and supplies
Electricity, the output end of the output rectification filter 5 are electrically connected to constant pressure and flow control unit 6, and the constant pressure and flow control unit 6 is used
PWM drive control unit 8 is fed back in the Current Voltage of detection circuit, and by the way that feedback signal 7 is isolated.
The power circuit further includes having detection resistance 13, and the detection resistance 13 is connect with detection control unit 11, inspection
The circuit voltage Real-time Feedback that measuring resistance 13 detects is to detection control unit 11.
Fig. 2 is the circuit diagram of the present embodiment, and the firewire of power supply AC input connect with fuse F1, later with rectifying and wave-filtering bridge
No. 2 pins of heap DB1 connect, and the zero curve of No. 3 pins connection AC input of rectifying and wave-filtering bridge heap DB1, No. 4 pin ground connection, No. 1 is drawn
Foot is connect with detection resistance (R10, R11) and switching tube respectively, and detection resistance (R10, R11) is connect with detection control unit U1,
Detection control unit U1 is connect with switching tube, and the conducting and cut-off of control switch pipe, and switching tube is first with isolating transformer T1's
Grade winding connection, after transformation is isolated in isolating transformer T1, the output rectification filter formed through diode D1 and capacitor C3 is to defeated
Load supplying out；Another way controls HF switch pipe MOS1 to PWM drive control unit U2 by start-up resistor R2, controls transformation
The switch work of device T1 armature winding, above-mentioned constant pressure and flow control unit 6 is by resistance R4, resistance R5 and zener diode U3 group
At the Current Voltage in circuit is fed back to PWM drive control unit U2 by isolation signals U4 by constant pressure and flow control unit 6.
In the present embodiment, detection control unit 11 is PIC single chip microcomputer, model PIC16F877, PWM drive control
Unit is power supply IC, model FAN6920MR.
The utility model by increasing switching tube and detection control unit two parts in circuit, when inputting AC voltage
It waits, first passes through detection control unit and remove to judge input voltage whether within specified voltage range, if it is in rated range
Interior ability control switch pipe is attracted conducting, to circuit power supply behind rectifying and wave-filtering, if detecting input voltage during the work time
For over-voltage or it is under-voltage when, turn off the switch pipe at once, cut away the circulation of circuit, achieve the purpose that safeguard protection, avoid because electricity
Some security risks that net spread of voltage causes.
It is obvious to a person skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and
And without departing substantially from the spirit or essential attributes of the utility model, it can realize that this is practical new in other specific forms
Type.Therefore, in all respects, the present embodiments are to be considered as illustrative and not restrictive, this is practical new
The range of type is indicated by the appended claims rather than the foregoing description, it is intended that containing for the equivalent requirements of the claims will be fallen in
All changes in justice and range are embraced therein.It should not treat any reference in the claims as limiting
Related claim.
Claims (4)
1. a kind of power circuit of anti-AC over-and under-voltage, which is characterized in that the power circuit includes AC input (1), rectification
Filter (3), isolating transformer (4), constant pressure and flow control unit (6), PWM drive control unit (8), starting (10) and detection control
Unit (11) processed, it is characterised in that: it is provided between the AC input (1) and the rectifying and wave-filtering (3) switching tube (2), it is described
Switching tube (2) is connect with detection control unit (11), the output end of the rectifying and wave-filtering (3) respectively with isolating transformer (4) and
Start (10) electrical connection, the starting (10) is electrically connected to the input terminal of PWM drive control unit (8), the PWM drive control
Unit (8) controls the switch work of isolating transformer (4) armature winding, the isolating transformer (4) by HF switch pipe (9)
Real-time voltage fed back to PWM drive control unit (8) by feedback power supply (12), and isolating transformer (4) will couple energy
It is transferred to output loading power supply by output rectification filter (5), the output end of the output rectification filter (5) is electrically connected to constant pressure
Constant-current control unit (6), the constant pressure and flow control unit (6) is used for the Current Voltage of detection circuit, and passes through isolation feedback
Signal (7) feeds back to PWM drive control unit (8).
2. a kind of power circuit of anti-AC over-and under-voltage according to claim 1, it is characterised in that: the power circuit is also
It include detection resistance (13), the detection resistance (13) connect with detection control unit (11).
3. a kind of power circuit of anti-AC over-and under-voltage according to claim 1 or 2, it is characterised in that: the detection control
Unit (11) processed is PIC single chip microcomputer, model PIC16F877.
4. a kind of power circuit of anti-AC over-and under-voltage according to claim 1, it is characterised in that: the PWM driving control
Unit (8) processed is power supply IC, model FAN6920MR.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821700869.7U CN208971130U (en) | 2018-10-19 | 2018-10-19 | A kind of power circuit of anti-AC over-and under-voltage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821700869.7U CN208971130U (en) | 2018-10-19 | 2018-10-19 | A kind of power circuit of anti-AC over-and under-voltage |
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| Publication Number | Publication Date |
|---|---|
| CN208971130U true CN208971130U (en) | 2019-06-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821700869.7U Active CN208971130U (en) | 2018-10-19 | 2018-10-19 | A kind of power circuit of anti-AC over-and under-voltage |
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| CN (1) | CN208971130U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110265881A (en) * | 2019-06-24 | 2019-09-20 | 廊坊新奥泛能网络科技服务有限公司 | Distribution box |
-
2018
- 2018-10-19 CN CN201821700869.7U patent/CN208971130U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110265881A (en) * | 2019-06-24 | 2019-09-20 | 廊坊新奥泛能网络科技服务有限公司 | Distribution box |
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