CN108988299A - Driving circuit and its protection circuit - Google Patents
Driving circuit and its protection circuit Download PDFInfo
- Publication number
- CN108988299A CN108988299A CN201810816537.3A CN201810816537A CN108988299A CN 108988299 A CN108988299 A CN 108988299A CN 201810816537 A CN201810816537 A CN 201810816537A CN 108988299 A CN108988299 A CN 108988299A
- Authority
- CN
- China
- Prior art keywords
- resistance
- triode
- signal
- driving
- driving unit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/125—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for rectifiers
- H02H7/1255—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for rectifiers responsive to internal faults, e.g. by monitoring ripple in output voltage
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Electronic Switches (AREA)
Abstract
A kind of driving circuit; including power input, the protection circuit for loading the driving unit for providing work energy and exporting trigger signal in failure by the power input, persistently exporting control signal for responding the trigger signal, the control unit for controlling the load according to the control signal and the driving unit works and stops; the power input, the driving unit, described control unit and the protection circuit are sequentially connected, the driving unit also with the protection circuit connection.Protection circuit includes rectification unit for converting the trigger signal of input to DC signal output and is used to respond the direct current signal and continues the lock cell of output control signal.Driving circuit responds the trigger signal exported when driving unit breaks down using protection circuit, and lasting output avoids driving unit component failure from bringing further harm, so that driving circuit security performance is higher for closing the control signal of driving unit work.
Description
Technical field
This application involves a kind of driving circuits, more particularly to a kind of driving circuit and its protection circuit.
Background technique
The electronic product touched with the progress of science and technology, in life is also more and more, greatly abundant and conveniently
People's lives, however, with failure caused by the reasons such as the aging and manual operation of component in electronic product be improper,
It is easy to cause the fever of other components in electronic product to damage, or even causes fire, hide biggish security risk.
Loaded work piece usually requires a driving circuit, however, after some component damage of driving circuit or short circuit, if
Do not stop drive circuit works, other is easy to cause not damage the damage of component and load.Traditional solutions are to appearance
One same component of component serial or parallel connection easy to damage, when one of component breaks down, another
Component can also work normally, but still damage there are two components or the risk of short circuit, cannot effectively play guarantor
Shield effect, security performance be not high.
Summary of the invention
Based on this, it is necessary to provide a kind of higher driving circuit of security performance and its protection circuit.
A kind of driving circuit, including power input, for by the power input be load work energy is provided
And the driving unit of trigger signal is exported in failure, persistently exports the protection electricity of control signal for responding the trigger signal
Road, the control unit for controlling the load according to the control signal and the driving unit works and stops, the electricity
Source input terminal, the driving unit, described control unit and the protection circuit are sequentially connected, the driving unit also with it is described
Protect circuit connection.
In one embodiment, the protection circuit includes: for converting direct current for the trigger signal of input
The rectification unit of signal output and the lock cell that the control signal is exported for responding the direct current signal and continuing, it is described
Lock cell includes: the first triode, the second triode, three end adjustable shunt reference sources, first resistor, second resistance, third
Resistance, the 4th resistance, the 5th resistance and the 6th resistance, the rectification unit pass through the 6th resistance and first triode
Base stage connection, first triode emitter ground connection；The collector of first triode is respectively with the described 2nd 3
The base stage of pole pipe is connected with the reference edge of three end adjustable shunt reference source；The grounded collector of second triode, hair
Emitter-base bandgap grading is connect with described control unit；The reference edge and cathode of three end adjustable shunt reference source are connected by the 4th resistance
It connects, the reference edge of three end adjustable shunt reference source is connected with anode by the 5th resistance, three end adjustable shunt
The cathode of a reference source is connect by the first resistor with the external power supply；One end of the 3rd resistor passes through the described 6th
Resistance is connect with the base stage of first triode, also passes through the yin of the second resistance and three end adjustable shunt reference source
Pole connection, the 3rd resistor other end ground connection.
In one embodiment, the lock cell further includes the 7th resistance, and the base stage of second triode passes through
7th resistance is connect with the reference edge of three end adjustable shunt reference source.
In one embodiment, the lock cell further includes the second capacitor, the both ends of second capacitor respectively with
The emitter and collector of second triode connects.
In one embodiment, the rectification unit includes first diode and first capacitor, the first diode
Anode connect with the driving unit, cathode is grounded by the first capacitor, and the cathode of the first diode also passes through
6th resistance is connect with the base stage of first triode.
In one embodiment, the driving unit includes: MOS pipe, third capacitor, the 8th resistance, inductance and second
Diode, the both ends of the inductance are connect with the anode of the power input and second diode respectively；Described second
The cathode of diode and the load connect, and also pass through the third capacity earth；The grid of the MOS pipe and the control
Unit connection, the source electrode of the MOS pipe and the protection circuit connection, also pass through the 8th resistance eutral grounding；The metal-oxide-semiconductor
Drain electrode connect with the positive of second diode.
It in one embodiment, further include for receiving external switch signal and exporting to the switch of described control unit
Unit.
A kind of protection circuit, comprising: for convert the trigger signal of input to DC signal output rectification unit and
For respond the direct current signal and continue output control signal lock cell, the lock cell include: the first triode,
Second triode, three end adjustable shunt reference sources, first resistor, second resistance, 3rd resistor, the 4th resistance, the 5th resistance and
6th resistance, the rectification unit are connect by the 6th resistance with the base stage of first triode, the one or three pole
The emitter of pipe is grounded；The collector of first triode is adjustable with the base stage of second triode and three end respectively
The reference edge of shunt reference source connects；The grounded collector of second triode；The base of three end adjustable shunt reference source
Quasi- end is connected with cathode by the 4th resistance, and the reference edge and anode of three end adjustable shunt reference source pass through described the
The connection of five resistance, the cathode of three end adjustable shunt reference source are connect by the first resistor with external power supply；Described
One end of three resistance is connect by the 6th resistance with the base stage of first triode, and the second resistance and institute are also passed through
State the cathode connection of three end adjustable shunt reference sources, the 3rd resistor other end ground connection.
In one embodiment, the lock cell further includes the 7th resistance, and the base stage of second triode passes through
7th resistance is connect with the reference edge of three end adjustable shunt reference source.
In one embodiment, the lock cell further includes the second capacitor, the both ends of second capacitor respectively with
The emitter and collector of second triode connects.
Above-mentioned driving circuit responds the trigger signal exported when driving unit breaks down using protection circuit, continues defeated
Out for closing the control signal of driving unit work, avoids driving unit component failure or short-circuit bring is further endangered
Evil, so that the security performance of driving circuit is higher.
Detailed description of the invention
Fig. 1 is the functional block diagram of the driving circuit of one preferred embodiment of the application.
Fig. 2 is the circuit diagram of driving circuit shown in Fig. 1.
Specific embodiment
The technical solution of the application is further illustrated with reference to the accompanying drawings and specific embodiments of the specification.It should be appreciated that this
Locate described specific embodiment to be only used to explain the application, is not used to limit the application.
It is the functional block diagram of the driving circuit 20 of one preferred embodiment of the application, the driving circuit as shown in Fig. 1
20 include: power input 11, for providing work energy by power input 11 for load 13 and exporting touching in failure
The driving unit 12 of signalling, is used for basis at the protection circuit 10 that control signal is persistently exported for responding the trigger signal
The control unit 14 of the control signal control load 13 and driving unit 12 work and stopping.
Power input 11, driving unit 12, control unit 14 and protection circuit 10 are sequentially connected, and driving unit 12 is also
It is connect with protection circuit 10.
In the present embodiment, driving circuit 20 further includes for receiving external switch signal and exporting opening to control unit 14
Close unit 15.
Control unit 14 is also used to respond the switching signal and stops load 13 and the work of driving unit 12.
As shown in Fig. 2, it is circuit diagram of driving circuit 20 shown in FIG. 1, in the present embodiment, protection circuit 10 is wrapped
Include rectification unit 101 and lock cell 102.
Rectification unit 101 includes first diode D1 and first capacitor C1, the lock cell 102 include: the one or three pole
Pipe Q1, the second triode Q2, three end adjustable shunt reference source IC, first resistor R1, second resistance R2,3rd resistor R3, the 4th
Resistance R4, the 5th resistance R5 and the 6th resistance R6.In the present embodiment, the first triode Q1 is preferably the triode of NPN, the
Two triode Q2 are preferably the triode of PNP type.
The anode of first diode D1 is connect with driving unit 12, and cathode is grounded by first capacitor C1, first diode
The cathode of D1 also passes through the 6th resistance R6 and connect with the base stage of the first triode Q1.The emitter of first triode Q1 is grounded, the
The collector of one triode Q1 is connect with the reference edge of the base stage of the second triode Q2 and three end adjustable shunt reference source IC respectively；
The grounded collector of second triode Q2, emitter are connect with control unit 14.
The reference edge of three end adjustable shunt reference source IC is connected with cathode by the 4th resistance R4, three end adjustable shunt benchmark
The reference edge of source IC is connected with anode by the 5th resistance R5, and the cathode of three end adjustable shunt reference source IC passes through first resistor R1
It is connect with external power supply, external power supply is that lock cell 102 provides a voltage VCC；One end of 3rd resistor R3 passes through the 6th electricity
Resistance R6 is connect with the base stage of the first triode Q1, is also connected by the cathode of second resistance R2 and three end adjustable shunt reference source IC
It connects, 3rd resistor R3 other end ground connection.
In the present embodiment, lock cell 102 further includes the 7th resistance R7 and the second capacitor C2.The base stage of second triode Q2
It is connect by the 7th resistance R7 with the reference edge of three end adjustable shunt reference source IC, the both ends of the second capacitor C2 are respectively with the two or three
The emitter and collector of pole pipe Q2 connects.7th resistance R7 and the second capacitor C2 is subject to dry for reducing lock cell 102
It disturbs, improves the stability of the output control signal.
In the present embodiment, driving unit 12 be a kind of switch DC booster circuit, comprising: metal-oxide-semiconductor Q3, third capacitor C3,
8th resistance R8, inductance L1 and the second diode D2, in the present embodiment, metal-oxide-semiconductor Q3 is preferably the enhanced metal-oxide-semiconductor of N-channel.
The both ends of inductance L1 are connect with the anode of power input 11 and the second diode D2 respectively；Second diode D2's
Cathode with load 13 for connecting, and the cathode of the second diode D2 is also connect with third capacitor C3 anode, third capacitor C3 cathode
Ground connection；The grid of metal-oxide-semiconductor Q3 is connect with control unit 14, and the source electrode of metal-oxide-semiconductor Q3 is connect with the anode of first diode D1, also logical
Cross the 8th resistance R8 ground connection；The drain electrode of metal-oxide-semiconductor Q3 is connect with the anode of the second diode D2.
The working principle of above-mentioned driving circuit 20 is as follows: under original state, the voltage of metal-oxide-semiconductor Q3 source electrode is smaller, can not make
The cathode output of first diode D1 conducting, first diode D1 is low level, since the cathode of first diode D1 passes through the
Six resistance R6 are connect with the first triode Q1 base stage, so that the first triode Q1 base voltage is low level.Due to NPN type first
The emitter of triode Q1 is grounded, and the voltage between base stage and emitter is less than conducting voltage, and the first triode Q1, which is in, to be cut
Only state, at this point, the current collection extremely high level of the first triode Q1, due to the collector and the second triode of the first triode Q1
The base stage of Q2 connects, and the second triode Q2 base stage is also high level, the grounded collector of the second triode of positive-negative-positive Q2, and the two or three
Pole pipe Q2 is in off state.
At this point, the reference edge of three end adjustable shunt reference source IC is connected by the base stage of the 7th resistance R7 and the first triode Q1
It connects, the voltage of reference edge is higher than the conducting voltage of three end adjustable shunt reference source IC, three end adjustable shunt reference source IC7
In the conductive state, at this point, the second triode Q2 emitter exports and gives control unit 14 high level signal, control unit 14 is responded
13 work of high level signal control load, and PWM signal is exported to the grid of metal-oxide-semiconductor Q3, which constantly controls MOS
The alternate on and off of pipe Q3, and then control inductance L1 accordingly and be alternately charged and discharged, it is provided for load 13 defeated higher than power supply
Enter the electric energy of the need of work of 11 external power supply output voltages of end.
When because of failure short circuit occurs for inductance L1 or the second diode D2.Moment flows through the voltage of metal-oxide-semiconductor Q3 for height
Voltage spikes, the spike flow to the anode of first diode D1 by the source electrode of metal-oxide-semiconductor Q3, first diode D1 and
Direct current signal first capacitor C1 smooth to output waveform after the spike rectifying and wave-filtering gives the base stage of the first triode Q1, makes
Obtaining the first triode Q1 base stage is high level.Since the emitter of the first triode of NPN type Q1 is grounded, base stage and emitter
Between voltage be greater than conducting voltage, the first triode Q1 conducting；After first triode Q1 conducting, current collection extremely low level,
The voltage of the second triode Q2 base stage has been dragged down, and then the second triode Q2 is connected.At this point, the second triode Q2 emitter is defeated
It is out low level to the control signal of control unit 14, control unit 14 responds the output that the low level signal stops pwm signal,
Metal-oxide-semiconductor Q3 cut-off, driving unit 12 stops working, so disconnect between load 13 and power input 11 for being electrically connected.
Since the collector of the first triode Q1 is connect with the reference edge of three end adjustable shunt reference source IC, so that the base of IC
The voltage at quasi- end is low level, and three end adjustable shunt reference source IC are in off state, and external power supply passes through first resistor at this time
It is high level that R1, second resistance R2, the 6th resistance R6, which keep the first triode Q1 base stage, so that the first triode Q1 is held on
State, the second triode Q2 are also tended to remain on, so that the second triode Q2 emitter is maintained at low level state, are made
The control driving unit 12 of control unit 14 is obtained persistently to stop working.
In addition, when switch unit 15 receives low level switching signal, the also correspondingly control load of control unit 14
13 and driving unit 12 stop working.In the present embodiment, switch unit 15 is that artificial control load 13 and driving unit 12 stop
The signal input part of work.
Above-mentioned driving circuit 20 responds the trigger signal exported when driving unit 12 breaks down using protection circuit 10,
Lasting output avoids 12 component failure of driving unit or short circuit band comes for closing the control signal of the work of driving unit 12
Further harm so that the security performance of driving circuit 20 is higher.
Claims (2)
1. a kind of driving circuit, which is characterized in that including power input, for being provided by the power input for load
Work energy and in failure export trigger signal driving unit, for respond the trigger signal persistently export control signal
Protection circuit, for according to it is described control signal control it is described load and the driving unit work and stop control list
Member, the power input, the driving unit, described control unit and the protection circuit are sequentially connected, and the driving is single
Member also with the protection circuit connection.
2. driving circuit according to claim 1, which is characterized in that the protection circuit includes: the institute for that will input
It states trigger signal and is converted into the rectification unit of DC signal output and for responding the direct current signal and continuing to export the control
The lock cell of signal processed, the lock cell include: the first triode, the second triode, three end adjustable shunt reference sources,
One resistance, second resistance, 3rd resistor, the 4th resistance, the 5th resistance and the 6th resistance, the rectification unit pass through the described 6th
Resistance is connect with the base stage of first triode, the emitter ground connection of first triode；The collection of first triode
Electrode is connect with the reference edge of the base stage of second triode and three end adjustable shunt reference source respectively；Described 2nd 3
The grounded collector of pole pipe, emitter are connect with described control unit；The reference edge and yin of three end adjustable shunt reference source
Pole is connected by the 4th resistance, and the reference edge and anode of three end adjustable shunt reference source are connected by the 5th resistance
It connects, the cathode of three end adjustable shunt reference source is connect by the first resistor with external power supply；The 3rd resistor
One end is connect by the 6th resistance with the base stage of first triode, can also by the second resistance and three end
Adjust the cathode connection of shunt reference source IC, the 3rd resistor other end ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810816537.3A CN108988299A (en) | 2018-07-24 | 2018-07-24 | Driving circuit and its protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810816537.3A CN108988299A (en) | 2018-07-24 | 2018-07-24 | Driving circuit and its protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108988299A true CN108988299A (en) | 2018-12-11 |
Family
ID=64550239
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810816537.3A Withdrawn CN108988299A (en) | 2018-07-24 | 2018-07-24 | Driving circuit and its protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108988299A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110599919A (en) * | 2019-09-19 | 2019-12-20 | 威创集团股份有限公司 | Lamp panel lifting control device |
-
2018
- 2018-07-24 CN CN201810816537.3A patent/CN108988299A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110599919A (en) * | 2019-09-19 | 2019-12-20 | 威创集团股份有限公司 | Lamp panel lifting control device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN206225983U (en) | Over-voltage over-current protection circuit | |
| CN102856892B (en) | A kind of power supply | |
| CN104577993A (en) | Input voltage protection circuit of switching power supply | |
| CN107294058A (en) | A kind of overvoltage undervoltage detection circuit applied to solar energy power accumulating power supply | |
| CN104218558B (en) | Anti-surging high tension protection circuit | |
| CN106505513B (en) | A kind of LED drive power and its output end short-circuit protection circuit | |
| CN102801138A (en) | Light-emitting diode (LED) over current protection circuit and light fitting | |
| CN102780199A (en) | Overcurrent protection circuit and lamp | |
| CN202503261U (en) | Protective device of input voltage fluctuation | |
| CN204304965U (en) | A kind of IGBT push-pull driver circuit | |
| CN106533144B (en) | Anti-reverse and current flowing backwards circuit | |
| CN208316566U (en) | Soft start power protecting circuit and Switching Power Supply | |
| CN207541476U (en) | One kind carries the external circuit breaker control circuit of combined floodgate detection function electric energy meter | |
| CN106099842A (en) | A kind of reversal connection or short-circuit protection circuit | |
| CN207265645U (en) | A kind of short-circuit protection circuit of driving load | |
| CN108988299A (en) | Driving circuit and its protection circuit | |
| CN203553906U (en) | Input voltage protection circuit of switching power supply | |
| CN205355776U (en) | Short -circuit protection circuit based on power load is unusual | |
| CN206099293U (en) | High voltage input protection circuit | |
| CN107093886A (en) | It is a kind of to be embedded in solar powered network from the voltage security power supply circuit become in device | |
| CN205248194U (en) | Drive circuit of relay | |
| CN209029914U (en) | A kind of switch power supply under-voltage protecting circuit and Switching Power Supply | |
| CN201307826Y (en) | LCD-TV power supply voltage detecting circuit | |
| CN203617680U (en) | Driving circuit and protection circuit thereof | |
| CN204376382U (en) | For the protective circuit of LED high-voltage light bar |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20181211 |
|
| WW01 | Invention patent application withdrawn after publication |