CN208782730U - A kind of power driving control circuit that anti-switching surge electric current is big - Google Patents
A kind of power driving control circuit that anti-switching surge electric current is big Download PDFInfo
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- CN208782730U CN208782730U CN201821659173.4U CN201821659173U CN208782730U CN 208782730 U CN208782730 U CN 208782730U CN 201821659173 U CN201821659173 U CN 201821659173U CN 208782730 U CN208782730 U CN 208782730U
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Abstract
The utility model discloses a kind of power driving control circuits that anti-switching surge electric current is big, including AC input, rectification unit, filter unit, isolating transformer, relay, detection unit, start unit, PWM drive control unit and constant pressure and flow control unit, the connection of the input terminal of the AC input and rectification unit, constant-current charge control unit is provided between the rectification unit and filter unit, the constant-current charge control unit is connected in parallel with relay, the output end of the start unit is electrically connected with the input terminal of detection unit, the start unit is electrically connected to the input terminal of 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 by feeding back power supply unit Drive control unit.The utility model can protect boot-strap circuit, it is ensured that electrical equipment is slowly switched on, and avoids to cross to hit because of electric current and brings harm.
Description
Technical field
The utility model relates to overcurrent protection field more particularly to the overcurrent protection fields of Switching Power Supply, specially a kind of
The big power driving control circuit of anti-switching surge electric current.
Background technique
It is well known that all unsuitable frequency the household electrical appliance and its precision instrument (such as clocking error tester) of the prior art
Numerous switch, this be primarily due to these household electrical appliance and precision instrument booting moment can generate one be greater than rated value 5 again with
On dash current, the dash current can very big Ground shock waves electronic component, or even burn these electronic components.Especially use
In some precision instruments in production, switch can be more frequent.Therefore, for these reasons, it would be highly desirable to need a kind of anti-switch
Dash current big power driving control circuit eliminates above-mentioned dash current, to protect these household electrical appliance and accurate instrument
Device.
Utility model content
The purpose of this utility model is to provide a kind of power driving control circuit that anti-switching surge electric current is big, have pair
Boot-strap circuit is protected, it is ensured that electrical equipment is slowly switched on, avoid because electric current cross hit brought by endanger the advantages of, solve
The problem of above-mentioned technical background is proposed.
To achieve the above object, the utility model provides the following technical solutions: a kind of power supply that anti-switching surge electric current is big
Drive control circuit, including AC input, rectification unit, filter unit, isolating transformer, relay, detection unit, starting list
The input terminal of member, PWM drive control unit and constant pressure and flow control unit, the AC input and rectification unit connects, described
Constant-current charge control unit is provided between rectification unit and filter unit, the constant-current charge control unit is in parallel with relay
Connection, the output end of the filter unit are electrically connected with isolating transformer and start unit respectively, the output of the start unit
End is electrically connected with the input terminal of detection unit, and the start unit is electrically connected to the input terminal of PWM drive control unit, described
PWM drive control unit manages the switch work of isolating transformer armature winding processed, the isolating transformer by HF switch
Real-time voltage feed back to PWM drive control unit by feeding back power supply unit, and control isolating transformer and lead to energy is coupled
It crosses output rectification filter and is transferred to output loading power supply, the output end of the output rectification filter is electrically connected to constant pressure and flow control
Unit, the constant pressure and flow control unit is used for the Current Voltage of detection circuit, and is driven by isolation feedback signal back to PWM
Dynamic control unit.
It preferably, include fuse, the fuse is connected on the firewire of AC input.
Preferably, the voltage of the AC input input is 100V-240V.
Compared with prior art, the beneficial effects of the utility model are as follows:
The utility model works as AC input by increasing constant-current charge control unit, relay, detection unit in circuit
When accessing alternating current, will not directly it charge to the electrolytic capacitor in circuit, but by constant-current charge control unit, give circuit
In electrolytic capacitor constant current charging, avoid immediate current mistake caused by the electrolytic capacitor both ends abrupt transients of filter unit
Greatly, after electrolytic capacitor charging to a certain extent, after detection unit detects the starting of power supply, then relay suction is controlled
It closes, constant-current charge control unit, this partial circuit short circuit is gone over, and has both avoided the big problem of immediate current of boot-strap in this way, and not
The output for influencing power supply can make power work get up more secure and reliable, be preferably minimized to the interference of power grid moment.
Detailed description of the invention
Fig. 1 is the circuit block diagram of the utility model；
Fig. 2 is the circuit diagram of an embodiment of the present invention.
Appended drawing reference and title in figure is as follows:
1, AC input；2, rectification unit；3, constant-current charge control unit；4, filter unit；5, isolating transformer；6, defeated
Rectifying and wave-filtering out；7, output loading；8, relay；9, HF switch pipe；10, detection unit；11, start unit；12, feedback supplies
Electric unit；13, PWM drive control unit；14, feedback signal is isolated；15, constant pressure and flow control unit；16, fuse.
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 drives control that anti-switching surge electric current is big
Circuit processed, including AC input 1, rectification unit 2, filter unit 4, isolating transformer 5, relay 8, detection unit 10, starting
Unit 11, PWM drive control unit 13 and constant pressure and flow control unit 15, the input terminal of the AC input 1 and rectification unit 2
Connection, the voltage that the AC input 1 inputs are 100V-240V, are provided with perseverance between the rectification unit 2 and filter unit 4
Current charge control unit 3, the constant-current charge control unit 3 are connected in parallel with relay 8, the output end of the filter unit 4
It is electrically connected respectively with isolating transformer 5 and start unit 11, the output end of the start unit 11 and the input of detection unit 10
End electrical connection, the start unit 11 are electrically connected to the input terminal of PWM drive control unit 13, the PWM drive control unit
13 control the switch work of 5 armature winding of isolating transformer, the real-time voltage of the isolating transformer 5 by HF switch pipe 9
PWM drive control unit 13 is fed back to by feeding back power supply unit 12, and controls isolating transformer 5 and passes through output for energy is coupled
Rectifying and wave-filtering 6 is transferred to the power supply of output loading 7, and it is single that the output end of the output rectification filter 6 is electrically connected to constant pressure and flow control
Member 15, the constant pressure and flow control unit 15 is used for the Current Voltage of detection circuit, and is fed back to by the way that feedback signal 14 is isolated
PWM drive control unit 13.
A kind of big power driving control circuit of anti-switching surge electric current, further includes having fuse 16, described molten
Disconnected device 16 is connected on the firewire of AC input 1.
Fig. 2 is the circuit diagram of an embodiment of the present invention, and alternating current and AC input are connected in figure, AC input
Live wire serial connection has a fuse F1, and No. 2 pins of rectifier bridge stack DB1 connect firewire, No. 3 pins zero curve in succession, No. 1 pin successively with
For electrically connecting, constant current is driven for detection resistance R1, constant flow regulation pipe Q1, isolating transformer T1, output filtered diode D1, output loading
Dynamic detection U1 real-time detection passes through the electric current of detection resistance R1, and controls the closure of relay, and start-up resistor R2 drives to PWM and controls
U2 processed controls HF switch pipe MOS1, and HF switch pipe MOS1 is connect with the armature winding of isolating transformer T1, and controls isolation
The switch work of the armature winding of transformer T1, output loading power supply is connect with above-mentioned constant pressure and flow control unit 15, described
Constant pressure and flow control unit 15 be made of resistance R4, resistance R5 and zener diode U3, constant pressure and flow control unit 15 passes through
Current Voltage in circuit is fed back to PWM drive control U2 by isolation signals U4.
When the utility model is used, electric current of the constant current driving detection U1 by detection detection resistance R1, control after booting
Constant flow regulation pipe Q1's opens depth, charges to electrolytic capacitor C1 constant electric current, and after charging to a certain extent, PWM is driven
Dynamic control U2 starting outputs signal to constant current driving detection U1, and constant current driving detection U1 control relay is attracted, and keeps electric current direct
Circulation, avoids the electrolytic capacitor C1 momentary charge electric current big time.
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 (3)
1. a kind of power driving control circuit that anti-switching surge electric current is big, including AC input (1), rectification unit (2), filtering
Unit (4), isolating transformer (5), relay (8), detection unit (10), start unit (11), PWM drive control unit (13)
With constant pressure and flow control unit (15), it is characterised in that: the AC input (1) connect with the input terminal of rectification unit (2), institute
It states and is provided between rectification unit (2) and filter unit (4) constant-current charge control unit (3), the constant-current charge control unit
(3) be connected in parallel with relay (8), the output end of the filter unit (4) respectively with isolating transformer (5) and start unit
(11) it is electrically connected, the output end of the start unit (11) is electrically connected with the input terminal of detection unit (10), the start unit
(11) it is electrically connected to the input terminal of PWM drive control unit (13), the PWM drive control unit (13) passes through HF switch pipe
(9) the switch work of isolating transformer (5) armature winding is controlled, the real-time voltage of the isolating transformer (5) is supplied by feedback
Electric unit (12) is fed back to PWM drive control unit (13), and controls isolating transformer (5) and coupling energy is passed through output rectification
Filtering (6) is transferred to output loading (7) power supply, and the output end of the output rectification filter (6) is electrically connected to constant pressure and flow control
Unit (15), the constant pressure and flow control unit (15) is used for the Current Voltage of detection circuit, and passes through isolation feedback signal
(14) PWM drive control unit (13) are fed back to.
2. a kind of big power driving control circuit of anti-switching surge electric current according to claim 1, it is characterised in that: also
It include fuse (16), the fuse (16) is connected on the firewire of AC input (1).
3. a kind of big power driving control circuit of anti-switching surge electric current according to claim 1, it is characterised in that: institute
The voltage for stating AC input (1) input is 100V-240V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821659173.4U CN208782730U (en) | 2018-10-13 | 2018-10-13 | A kind of power driving control circuit that anti-switching surge electric current is big |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821659173.4U CN208782730U (en) | 2018-10-13 | 2018-10-13 | A kind of power driving control circuit that anti-switching surge electric current is big |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208782730U true CN208782730U (en) | 2019-04-23 |
Family
ID=66162914
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821659173.4U Active CN208782730U (en) | 2018-10-13 | 2018-10-13 | A kind of power driving control circuit that anti-switching surge electric current is big |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208782730U (en) |
-
2018
- 2018-10-13 CN CN201821659173.4U patent/CN208782730U/en active Active
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