CN104184104B - A kind of overcurrent protection automatic restoring circuit - Google Patents
A kind of overcurrent protection automatic restoring circuit Download PDFInfo
- Publication number
- CN104184104B CN104184104B CN201310201712.5A CN201310201712A CN104184104B CN 104184104 B CN104184104 B CN 104184104B CN 201310201712 A CN201310201712 A CN 201310201712A CN 104184104 B CN104184104 B CN 104184104B
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- circuit
- control circuit
- overcurrent protection
- switching tube
- load
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Abstract
The embodiment of the invention discloses a kind of overcurrent protection automatic restoring circuit, and the embodiment of the invention discloses a kind of overcurrent protection automatic restoring circuit, the on-off circuit is connected with load, for providing operating current to the load；The control circuit is connected with the on-off circuit, for controlling the break-make of the on-off circuit, and then the load overcurrent or it is short-circuit when, close the on-off circuit in time, and after load overcurrent or short circuit eliminate, resetted automatically under outside power drives.It follows that the embodiment of the present invention possesses carries out overcurrent protection and the function of recovering automatically by on-off circuit, it is suitably for all kinds of on-off circuits and does current foldback circuit.
Description
Technical field
The present invention relates to electronic applications, more particularly to a kind of overcurrent protection automatic restoring circuit.
Background technology
When there are the fortuitous events such as load short circuits, overload or control circuit failure, in no overcurrent protective device
In the case of be easily high-power switch tube damage, and the overcurrent protection of many electric equipment products at present is usually to be needed again after protecting
Electrifying startup again is powered off, due to the inconvenient power-off startup manually of limitation of having ready conditions, brings great inconvenience.
The content of the invention
Technical problem to be solved of the embodiment of the present invention is, there is provided a kind of overcurrent protection automatic restoring circuit, possesses
The function that Switching Power Supply is recovered automatically, have the function that overcurrent protection, excessively stream are resumed work automatically after eliminating, be suitably for all kinds of
On-off circuit does current foldback circuit.
In order to solve the above-mentioned technical problem, the embodiments of the invention provide a kind of overcurrent protection automatic restoring circuit, including：
On-off circuit and control circuit, wherein：
The on-off circuit is connected with load, for providing operating current to the load；
The control circuit is connected with the on-off circuit, for controlling the break-make of the on-off circuit, and then described
Load overcurrent or it is short-circuit when, the on-off circuit is closed in time, and after load overcurrent or short circuit eliminate, in outside power drives
Under reset automatically.
Preferably, the control circuit includes power input, current detecting end, dutycycle output end, earth terminal；
The on-off circuit includes：Transformer T1 and switching tube Q1, wherein：
The armature winding one of the transformer T1 terminates external power source VH, the drain electrode phase of the other end and the switching tube Q1
Even；
One end of the first secondary windings of the transformer T1 is connected with the power input of the control circuit, the change
The other end ground connection of depressor T1 the first secondary windings；
The second subprime winding of the transformer T1 connects load；
The grid of the switching tube Q1 is connected with the dutycycle output end of the control circuit, the source electrode of the switching tube Q1
It is connected with the current detecting end；
The power input of the control circuit is connected by divider resistance with external power source VH.
Preferably, the power input of the control circuit by divider resistance R1, R2, R3 for being sequentially connected in series with it is described outer
Portion power supply VH is connected.
Preferably,
The source electrode of the switching tube Q1 is grounded by divider resistance R6.
Preferably,
The source electrode of the switching tube Q1 is connected resistance R7 with the current detecting end of the control circuit；
And the current detecting end and the common port of the resistance R7 are grounded by filter capacitor C2.
Preferably,
Resistance R5 is connected between the grid of the switching tube Q1 and the dutycycle output end of the control circuit.
Preferably, between one end of the first secondary windings of the transformer T1 and the power input of the control circuit
Connect one-way conduction diode D1 and divider resistance R3.
Preferably, the grid of the switching tube Q1 is grounded by divider resistance R4.
The embodiment of the present invention has the following advantages that or beneficial effect：
The embodiment of the invention discloses a kind of overcurrent protection automatic restoring circuit, the on-off circuit is connected with load, uses
In to it is described load provide operating current；The control circuit is connected with the on-off circuit, for controlling the on-off circuit
Break-make, and then the load overcurrent or it is short-circuit when, close the on-off circuit in time, and eliminate in load overcurrent or short circuit
Afterwards, resetted automatically under outside power drives.It follows that the embodiment of the present invention possesses carries out excessively stream guarantor by on-off circuit
Shield and the function of recovering automatically, are suitably for all kinds of on-off circuits and do current foldback circuit.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the modular structure composition schematic diagram of an embodiment of the motor control circuit of the present invention.
Fig. 2 is the circuit structure composition schematic diagram of an embodiment of the motor control circuit of the present invention.
Fig. 3 is the circuit structure composition schematic diagram of another embodiment of the motor control circuit of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of creative work is not made
Embodiment, belong to the scope of protection of the invention.
With reference to figure 1, the embodiment of the invention discloses a kind of overcurrent protection automatic restoring circuit, on-off circuit and control electricity
Road, wherein：The on-off circuit is connected with load, for providing operating current to the load；The control circuit with it is described
On-off circuit is connected, for controlling the break-make of the on-off circuit, and then the load overcurrent or it is short-circuit when, close institute in time
On-off circuit is stated, and after load overcurrent or short circuit eliminate, is resetted automatically under outside power drives.
Opened in the specific implementation, the switching tube Q1 of the embodiment of the present invention can have for N-channel MOS pipe, P-channel metal-oxide-semiconductor etc.
Close the element of function.
With further reference to Fig. 2, the circuit structure of an embodiment of the overcurrent protection automatic restoring circuit of the embodiment of the present invention
It may include power supply VH, transformer T1, metal-oxide-semiconductor Q1, control circuit U1, wherein：The power supply VH is connected with the transformer T1；Institute
Transformer T1 is stated respectively with the power supply VH, the control circuit, the switching tube Q1 to be connected；The switching tube Q1 is metal-oxide-semiconductor,
The metal-oxide-semiconductor Q1 is connected with the control circuit and the transformer T1 respectively, the electricity sent for receiving the transformer T1
Flow signal.Specifically, the of the transformer T1 1. level winding (the first secondary windings) both ends respectively with the control circuit
U1 power input VCC is connected with ground；The of the transformer T1 2. level winding (armature winding) both ends respectively with power supply
VH and the metal-oxide-semiconductor Q1 drain electrode are connected；The 3. both ends of level winding (second subprime winding) and the load of the transformer T1
It is (not shown) to be connected；The grid of the metal-oxide-semiconductor Q1 is connected with the dutycycle output end GD of the control circuit U1 respectively；It is described
Metal-oxide-semiconductor Q1 source electrode is connected with the current detecting end IS of the control circuit U1 respectively, the power input of the control circuit U1
End can be connected by divider resistance R1, R2 with external power source VH.
,, can be Fig. 2's in some feasible embodiments on the basis of example shown in Fig. 2 with further reference to Fig. 3
On the basis of circuit, the one or more in following circuit structures are may also include.
1st, the source electrode of the switching tube Q1 is grounded by divider resistance R6.
2nd, resistance R7 is connected between the source electrode of the switching tube Q1 and the current detecting end IS of the control circuit U1；And institute
The common port for stating current detecting end IS and the resistance R7 is grounded by filter capacitor C2.
3rd, resistance R5 is connected between the grid of the switching tube Q1 and the dutycycle output end GD of the control circuit U1.
The of 4, the transformer T1 1. one end of level winding (the first secondary windings) and the power supply of the control circuit U1
One-way conduction diode D1 and divider resistance R3 is connected between input VCC.
5th, the grid of the switching tube Q1 is grounded by divider resistance R4.
In the specific implementation, the operation principle of the circuit of the embodiment of the present invention approximately as：
In an initial condition, external power source starts control circuit U1 by divider resistance R1 and R2, is driven by control circuit U1
Dynamic transformer T1 the first secondary windings works and provides operating voltage for the control circuit U1, and now, control circuit U1 leads to
Cross dutycycle output end GD and output signal to switching tube Q1, driving switch pipe Q1 work, and then drive the negative of second subprime winding
Carry normal work.
When load occur excessively stream or it is short-circuit when, the electric current on transformer T1 windings can increase immediately, cause metal-oxide-semiconductor Q1 to drain
The electric current of source electrode is uprushed, and current signal is sent to control circuit U1 current detecting pin IS, when being conveyed to current detecting pin IS's
When magnitude of voltage reaches control circuit U1 current detecting pin IS threshold voltage (such as 1v), control circuit U1 dutycycle is defeated
The dutycycle for going out pin GD outputs reduces, by metal-oxide-semiconductor Q1 electric current also with reduction, it is meant that the 2. level winding of the of transformer T1
The electric current of (armature winding) reduces, and the electric current of the 1. level winding (the first secondary windings) of the of the transformer T1 reduces immediately, because
This control circuit U1 power input pin VCC supply voltages reduce and be gradually decrease to below control circuit U1 operating voltage and
It is stopped, now metal-oxide-semiconductor Q1 ends, so as to protect metal-oxide-semiconductor Q1 not to be burned.
And after excessively stream or short circuit eliminate, load restoration is normal, in the case where power supply VH provides voltage, control circuit
U1 can be activated again, and driving transformer T1 works, and then whole circuit can recover normal.
Above disclosure is only preferred embodiment of present invention, can not limit the right model of the present invention with this certainly
Enclose, therefore the equivalent variations made according to the claims in the present invention, still belong to the scope that the present invention is covered.
Claims (7)
- A kind of 1. overcurrent protection automatic restoring circuit, it is characterised in that including：On-off circuit and control circuit, wherein：The on-off circuit is connected with load, for providing operating current to the load；The control circuit is connected with the on-off circuit, for controlling the break-make of the on-off circuit, and then in the load Excessively stream or it is short-circuit when, close the on-off circuit in time, and after load overcurrent or short circuit eliminate, under outside power drives from Dynamic restarting；The control circuit includes power input, current detecting end, dutycycle output end, earth terminal；The on-off circuit includes：Transformer T1 and switching tube Q1, wherein：The armature winding one of the transformer T1 terminates external power source VH, and the other end is connected with the drain electrode of the switching tube Q1；One end of the first secondary windings of the transformer T1 is connected with the power input of the control circuit, the transformer The other end ground connection of T1 the first secondary windings；The second subprime winding of the transformer T1 connects load；The grid of the switching tube Q1 is connected with the dutycycle output end of the control circuit, the source electrode of the switching tube Q1 and institute Current detecting end is stated to be connected；The power input of the control circuit is connected by divider resistance with external power source VH.
- 2. overcurrent protection automatic restoring circuit as claimed in claim 1, it is characterised in that the power input of the control circuit End is connected by divider resistance R1, R2 for being sequentially connected in series, with the external power source VH.
- 3. overcurrent protection automatic restoring circuit as claimed in claim 1 or 2, it is characterised in thatThe source electrode of the switching tube Q1 is grounded by divider resistance R6.
- 4. overcurrent protection automatic restoring circuit as claimed in claim 1 or 2, it is characterised in thatThe source electrode of the switching tube Q1 is connected resistance R7 with the current detecting end of the control circuit；And the current detecting end and the common port of the resistance R7 are grounded by filter capacitor C2.
- 5. overcurrent protection automatic restoring circuit as claimed in claim 1 or 2, it is characterised in thatResistance R5 is connected between the grid of the switching tube Q1 and the dutycycle output end of the control circuit.
- 6. overcurrent protection automatic restoring circuit as claimed in claim 1 or 2, it is characterised in that the first of the transformer T1 One-way conduction diode D1 and divider resistance R3 is connected between the power input of one end of secondary windings and the control circuit.
- 7. overcurrent protection automatic restoring circuit as claimed in claim 1 or 2, it is characterised in that the grid of the switching tube Q1 It is grounded by divider resistance R4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310201712.5A CN104184104B (en) | 2013-05-27 | 2013-05-27 | A kind of overcurrent protection automatic restoring circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310201712.5A CN104184104B (en) | 2013-05-27 | 2013-05-27 | A kind of overcurrent protection automatic restoring circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104184104A CN104184104A (en) | 2014-12-03 |
| CN104184104B true CN104184104B (en) | 2017-11-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310201712.5A Active CN104184104B (en) | 2013-05-27 | 2013-05-27 | A kind of overcurrent protection automatic restoring circuit |
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| CN (1) | CN104184104B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1937383A (en) * | 2005-09-22 | 2007-03-28 | 松下电器产业株式会社 | Switch power supply, semiconductor appatatus and controlling method |
| CN201243197Y (en) * | 2008-07-02 | 2009-05-20 | 通力盛达能源设备（北京）有限公司 | Protection circuit for short circuit of module power supply |
| CN201369674Y (en) * | 2009-01-13 | 2009-12-23 | 深圳创维数字技术股份有限公司 | Switch power supply circuit with short-circuit protection |
| CN201699400U (en) * | 2009-11-10 | 2011-01-05 | 佛山市顺德区瑞德电子实业有限公司 | Short-circuit protection circuit for flyback power supply |
-
2013
- 2013-05-27 CN CN201310201712.5A patent/CN104184104B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1937383A (en) * | 2005-09-22 | 2007-03-28 | 松下电器产业株式会社 | Switch power supply, semiconductor appatatus and controlling method |
| CN201243197Y (en) * | 2008-07-02 | 2009-05-20 | 通力盛达能源设备（北京）有限公司 | Protection circuit for short circuit of module power supply |
| CN201369674Y (en) * | 2009-01-13 | 2009-12-23 | 深圳创维数字技术股份有限公司 | Switch power supply circuit with short-circuit protection |
| CN201699400U (en) * | 2009-11-10 | 2011-01-05 | 佛山市顺德区瑞德电子实业有限公司 | Short-circuit protection circuit for flyback power supply |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104184104A (en) | 2014-12-03 |
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