CN110460012A - A kind of power device isolating and protecting device - Google Patents
A kind of power device isolating and protecting device Download PDFInfo
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- CN110460012A CN110460012A CN201910771454.1A CN201910771454A CN110460012A CN 110460012 A CN110460012 A CN 110460012A CN 201910771454 A CN201910771454 A CN 201910771454A CN 110460012 A CN110460012 A CN 110460012A
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- 238000007689 inspection Methods 0.000 claims description 2
- 238000002955 isolation Methods 0.000 abstract description 33
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- 230000007547 defect Effects 0.000 abstract description 2
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- 239000003990 capacitor Substances 0.000 description 19
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/06—Details with automatic reconnection
- H02H3/066—Reconnection being a consequence of eliminating the fault which caused disconnection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
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Abstract
The present invention relates to a kind of power device isolating and protecting devices.The technical scheme is that 10. 2. power supply connects current foldback circuit, high-voltage power circuit is 3., 2. 3. current foldback circuit connects high-voltage power circuit, 3. 6. high-voltage power circuit connects current detection circuit, 6. 4. current detection circuit is separately connected drive amplification circuit, feedback control circuit is 7., logic control circuit is 8., load equipment is 9., 9. reference end is grounded load equipment, 7. 8. feedback control circuit connects logic control circuit, 8. 5. logic control circuit connects low-voltage control circuit, 4. 2. drive amplification circuit is separately connected current foldback circuit, cross current feedback circuit 1., it crosses current feedback circuit and 1. connects logic control circuit 8..The present invention overcomes power device defects easy to damage.The present invention when short circuit occurs for load equipment can quick response turn off and protects power device, after realizing short circuit disappearance, circuit self- recoverage normal condition；The working condition of isolation control and detection load equipment.
Description
Technical field
The present invention relates to power device isolation drive and protection field, in particular to a kind of power device insulation blocking dress
It sets.
Background technique
As people are to the higher and higher of circuit safety design requirement, device failure caused by equipment short circuit and equipment loss
It is gradually concerned by people, the existing drawbacks such as output overloading and short circuit are gradually difficult to meet to make driving circuit in use
With.In the circuit design field that power device drives and protects, prevent to occur in circuit short circuit using a kind of protective device now
As safety can be improved, reduce permanent damage of the load equipment because power device is damaged, prevented caused by short circuit.
Before making the present invention, the design method of conventionally employed blown fuse device needs to insure using blown fuse device
Silk overcurrent fusing avoids function since the working principle of fuse is that power fever causes metal melt fracture to realize open circuit phenomenon
Rate device is in over-current state for a long time.Defect existing for the method have after blown fuse circuit cannot restore normal condition,
The blown fuse response time is too long.Bring consequence is once short circuit or over-current phenomenon avoidance occurs, power device is largely
On can be damaged because the response time is too long；After circuit is in open circuit, need to re-replace fuse, it is cumbersome.
Summary of the invention
The object of the invention is that overcoming drawbacks described above, a kind of power device isolating and protecting device is developed.
The technical scheme is that
A kind of power device isolating and protecting device, is mainly characterized by, power supply 10. connect current foldback circuit 2.,
3., 2. 3. current foldback circuit connects high-voltage power circuit to high-voltage power circuit, 3. high-voltage power circuit connects current detecting electricity
Road 6., current detection circuit be 6. separately connected drive amplification circuit 4., feedback control circuit 7., logic control circuit 8., load
9., 9. reference end is grounded load equipment equipment, and 7. 8. feedback control circuit connects logic control circuit, 8. logic control circuit connects
Connect low-voltage control circuit 5., 4. drive amplification circuit is separately connected current foldback circuit current feedback circuit 1., feed back by overcurrent 2., excessively
1. 8. circuit connects logic control circuit.
5. the low-voltage control circuit connects common node of the high-voltage power circuit 3. with current foldback circuit 2., low pressure control
The reference end ground connection of circuit processed 5..
The feedback control circuit 7. input terminal connection current detection circuit 6., the common node of load equipment 9., control
The reference end ground connection of feed circuit processed 7..
The beneficial effects of the present invention are:
When short circuit or over-current phenomenon avoidance occur for load equipment, with quick response over-current signal and power device can be carried out
Shutdown, thus effective protection power device；After short circuit disappearance may be implemented, circuit self- recoverage normal condition；It can isolate control
The working condition of system and detection load equipment；Design scheme can be used for the design circuit of other similar function after deformation, and
Load equipment can be effectively controlled.
Detailed description of the invention
Fig. 1 --- circuit block diagram of the invention.
Fig. 2 --- circuit diagram of the invention.
Each label indicates that corresponding component names are as follows in figure:
Cross current feedback circuit 1., current foldback circuit 2., high-voltage power circuit 3., drive amplification circuit 4., low voltage control
Circuit 5., current detection circuit 6., feedback control circuit 7., logic control circuit 8., load equipment 9., power supply 10..
Each label indicates that corresponding signal meaning is as follows in figure:
Overcurrent feedback signal (S1) crosses flow control signals (S2), high-voltage end cut-off signals (S3), high-voltage end power supply signal
(S4), high-voltage end control signal (S5), low-pressure end control signal (S6), high-voltage end reference signal (S7), load detection signal
(S8), overcurrent reset signal (S9), over-current signal (S10), analog current signal (S11), high-voltage end load signal (S12), control
Feedback signal (S13) processed.
Specific embodiment
It is as shown in Figure 1 and Figure 2:
Structure of the invention are as follows:
4. drive amplification circuit connected the input terminal of current feedback circuit 1., mistake with the common node of current foldback circuit 2.
The overcurrent feedback end of output end connection logic control circuit 8. of current feedback circuit 1.；The control output end of logic control circuit 8.
Connect the control signal of low-voltage control circuit 5.；6. the reseting controling end connection current detection circuit of logic control circuit 8.
Control signal, the input terminal of overcurrent output end connection drive amplification circuit 4. of current detection circuit 6., drive amplification circuit
4. output end connection current foldback circuit control signal 2.；The analog output end of current detection circuit 6. connects logic
The analog input end of control circuit 8.；The control of control output end connection logic control circuit 8. of feedback control circuit 7. is anti-
Present end.
The input terminal of feeder ear connection high-voltage power circuit 3. of power supply 10., the output end of high-voltage power circuit 3. connect electricity
The detection input of current detection circuit 6., the input terminal of detection output connection load equipment 9. of current detection circuit 6., bears
Carry the output end ground connection of equipment 9.；The input terminal of feeder ear connection current foldback circuit 2. of power supply 10., current foldback circuit is 2.
Output end connection low-voltage control circuit input terminal 5., the output end ground connection of low-voltage control circuit 5.；High-voltage power circuit is 3.
The control signal connection current foldback circuit 2. common node with low-voltage control circuit 5.；Current detection circuit 6. and load
The input terminal of common node connection feedback control circuit 7. of equipment 9., the output end ground connection of feedback control circuit 7..
Logic control circuit 8. pass through control low-voltage control circuit 5. in isolation optocoupler 05 opening or turn off, control is high
Pressure power circuit 3. in metal-oxide-semiconductor Q1 opening or turning off.
After in high-voltage power circuit, 3. middle metal-oxide-semiconductor Q1 is opened, 6. middle detection chip U4 carries out detection letter to current detection circuit
Breath input (signal (S8), signal (S12)) and state input (signal (S9)), control information output (signal (S11)) and state
Export (signal (S10)), signal (S10) by drive amplification circuit 4. output signal (S2) respectively to current foldback circuit 2. and
Cross current feedback circuit 1., signal (S2) control current foldback circuit 2. in isolation optocoupler 04 opening or turning off, realize short circuit
Defencive function；Signal (S2) controlled current feedback circuit 1. output signal (S1) to logic control circuit 8. in carry out logic control
And judgement.
High-voltage power circuit 3. in metal-oxide-semiconductor Q1 signal (S8) successively through overcurrent sensing circuit 6. and feedback control circuit
After 7., by feedback control circuit 7. in isolation optocoupler 06 opening or turning off, signal (S13) feedback is arrived into logic control
Circuit is 8. middle to carry out logic control and judgement.
8. logic control circuit can receive the current detection circuit signal (S11) that 6. middle detection chip U4 is exported in real time, into
Horizontal high voltage power circuit 3. in metal-oxide-semiconductor Q1 job information.
Concrete principle figure is as shown in Figure 2:
Crossing current feedback circuit 1. includes resistance R13, capacitor C7 and diode D3；One end of the resistance R13 connects control
Power end, the other end connect signal (S1) end；One end connection control power ground of the capacitor C7, other end connection signal
(S1) it holds；The forward end connection signal (S1) of the diode D3 is held, backward end connection signal (S2) end.
2. current foldback circuit includes resistance R14 and isolation optocoupler 04；One end connection signal (S2) of the resistance R14
End, the other end connect the second endpoint of the isolation optocoupler 04；The first end point connection control power end of the isolation optocoupler 04,
Second endpoint connects one end of the resistance R14, third endpoint connection signal (S3) end and the end signal (S5), the connection of the 4th endpoint
Signal (S4) end.
3. high-voltage power circuit includes resistance R15, diode ZD3, resistance R66 and metal-oxide-semiconductor Q1；The one of the resistance R15
Hold the end connection signal (S3) and the end signal (S5), other end connection signal (S4) end；The forward end of the diode ZD3 connects letter
The end number (S3) and the end signal (S5), backward end connection signal (S4) end；One end connection signal (S3) of the resistance R66 is held and letter
The end number (S5), the other end connect the grid of the metal-oxide-semiconductor Q1；One end of the grid connection resistance R66 of the metal-oxide-semiconductor Q1, source electrode
Connection signal (S4) end, drain electrode connection signal (S8) end.
4. drive amplification circuit includes driving chip U3；The first end point of the driving chip U3 connects control with third endpoint
Power ground processed, the 5th endpoint connection control power end, the second endpoint connection signal (S10) end, the 4th endpoint connection signal (S2)
End.
5. low-voltage control circuit includes resistance R17, resistance R16 and isolation optocoupler 05；One end of the resistance R17 connects letter
The end number (S6), the other end connect the second endpoint of the isolation optocoupler 05；One end of the resistance R16 connects the isolation optocoupler
05 the 4th endpoint, other end connection signal (S3) end and the end signal (S5)；The first end point of the isolation optocoupler 05 connects control
Power end processed, the second endpoint connect one end of the resistance R17, third endpoint connection signal (S7) end, and the 4th endpoint connects institute
State one end of resistance R16.
6. current detection circuit includes resistance R21, resistance R19, resistance R20, capacitor C8, capacitor C9, capacitor C10, capacitor
C11 and detection chip U4；One end connection control power end of the resistance R21, the other end connect the of the detection chip U4
15 endpoints；One end of the resistance R19 connects the 15th endpoint of the detection chip U4, other end connection control power supply
Ground；One end connection signal (S10) of the resistance R20 is held, other end connection control power end；One end of the capacitor C8 connects
Control power ground, other end connection control power end；One end connection signal (S10) of the capacitor C9 is held, other end connection control
Power ground processed；One end of the capacitor C10 connects the tenth end point of the detection chip U4, other end connection control power supply
Ground；One end of the capacitor C11 connects the tenth endpoint of the detection chip U4, other end connection control power ground；The inspection
The first, second, third, fourth endpoint of survey chip U4 together hold by connection signal (S8), the five, the six, the seven, the 8th endpoints one
The end connection signal (S12), the 9th endpoint connection control power ground are played, the tenth endpoint connects one end of the capacitor C11, and the 11st
Endpoint connects one end of the capacitor C10, the 12nd endpoint connection signal (S11) end, the 13rd endpoint connection signal (S10)
End, the 14th endpoint connection control power end, the 15th endpoint connect one end of the resistance R21, the 16th endpoint connection letter
The end number (S9).
7. feedback control circuit includes resistance R22, resistance R24, resistance R23, capacitor C12, diode ZD4 and isolation optocoupler
06；One end connection signal (S13) of resistance R22 is held, other end connection control power ground；One end of the resistance R24 connects institute
The first end point of isolation optocoupler 06 is stated, the other end connects the forward end of the diode ZD4；One end of the resistance R23 connects
The forward end of diode ZD4, other end connection signal (S12) end；One end connection signal (S7) of the capacitor C12 is held, another
End connects the forward end of the diode ZD4；One end connection signal (S7) of the diode ZD4 is held, described in other end connection
One end of the capacitor C12；The first end point of the isolation optocoupler 06 connects one end of the resistance R24, the connection of the second endpoint
Signal (S7) end, third endpoint connection signal (S13) end, the 4th endpoint connection control power end.Application process of the present invention is brief
Illustrate:
In this example, as shown in Fig. 2, signal (S6) is 8. exported 5. low pressure control to low-voltage control circuit by logic control circuit
Circuit processed is 5. by signal (S6) by isolation optocoupler 05, output signal (S5),
Wherein the response time of signal (S5) depends on the transmission delay t of isolation optocoupler 051(about 3 is delicate) and isolation light
The size of current I of light emitting diode in coupling 05F, i.e.,
Wherein VDDTo control power end voltage, VDFor diode conduction voltage drop.
Further, low-voltage control circuit 5. output signal (S5) driving high-voltage power circuit metal-oxide-semiconductor Q1 3. open or
Shutdown realizes isolation control and is switched on or off, signal (S4) and signal 10. using power supply are needed during output signal
(S7)；
The wherein metal-oxide-semiconductor Q1 of high-voltage power circuit 3. is opened or is turned off depending between metal-oxide-semiconductor Q1 source electrode and grid
Pressure drop Vgs, i.e.,
Wherein VSSFor the supply voltage of power supply 10..
Diode ZD3 can prevent pressure drop excessively high by pressure drop clamper in a threshold value；When opening or turning off of metal-oxide-semiconductor Q1
Between depend on resistance R66 to CGS(junction capacity of metal-oxide-semiconductor source electrode and grid) charge and discharge time t2。
Further, 3. 6. output signal (S8) arrives current detection circuit to high-voltage power circuit, during output signal
Need the signal (S4) 10. using power supply；9. signal (S12) is 6. respectively outputted to load equipment and controlled by current detection circuit
Feed circuit is 7.；6. current detection circuit passes through the state control of the current acquisition and signal (S9) of detection chip U4, by signal
(S10) be respectively outputted to drive amplification circuit 4. with logic control circuit 8., realize and be galvanically isolated acquisition and curent change is fast
Speed response；
Wherein the response time of signal (S10) depends on the failure output response time t of detection chip U43(about 1.9 is micro-
It is wonderful) and failure output delay time t4, size of the delay time depending on capacitor C9, i.e.,
Wherein VDDControl terminal supply voltage.
Further, 8. signal (S11) is 6. output to logic control circuit by current detection circuit, realizes analog current
Real time monitoring；Drive amplification circuit 4. by signal (S2) be respectively outputted to current feedback circuit 1. with current foldback circuit 2.；
Wherein the response time of signal (S2) depends on the conversion time t of driving chip U35(about 0.01 is delicate).
Further, the isolation optocoupler 04 of current foldback circuit 2. controls signal (S3) further control high-voltage power circuit
3. quick acting realized flow control quick response and isolation control, needed during output signal using power supply 10.
Signal (S4).
Wherein the response time of signal (S3) depends on the transmission delay t depending on isolation optocoupler 046(about 3 is delicate) and
The size of current I of light emitting diode in isolation optocoupler 04F, i.e.,
Wherein VDDTo control power end voltage, VDFor diode conduction voltage drop.
In summary, since the metal-oxide-semiconductor Q1 of high-voltage power circuit 3. generates short-circuit signal, 2. will to current foldback circuit
During the entire process of metal-oxide-semiconductor Q1 is rapidly switched off, Whole Response time t7Depending on t2、t3、t4、t5、t6WithSize, i.e.,
WhereinFor the size of current I of 04 light emitting diode of isolation optocouplerFThe time limited.
Further, it crosses current feedback circuit and 1. 8. signal (S1) is output to logic control circuit, use RDC delay recovery
Circuit can effectively avoid the malfunction of interference signal；
Wherein the response time of signal (S1) depends on resistance R13 and diode D3 to the charge and discharge time of capacitor C7, fills
Electric time t8Depending on the size of resistance R13 and capacitor C7, discharge time t9Depending on diode D3 and capacitor C7 size, i.e.,
Wherein VDDTo control power end voltage, V0For the capacitance voltage started to charge, VtFor t8The capacitance voltage at time point.
Due to only diode D3 in discharge loop, there is no resistance current limliting, therefore, discharge time t9Close to zero.
Further, 8. signal (S13) is output to logic control circuit by the isolation optocoupler 06 of feedback control circuit 7., In
The signal (S7) using power supply 10. is needed during output signal, realizes isolation control and rapid feedback.
Wherein the response time of signal (S13) depends on the transmission delay t depending on isolation optocoupler 066(about 3 is delicate)
With the size of current I of light emitting diode in isolation optocoupler 06F, i.e.,
VRD=IF*R24+VD (8)
WhereinFor the current detection circuit voltage (the about supply voltage of power supply 10.) that 6. output signal (S12) is held, VD
For diode conduction voltage drop, VRDFor the sum of electric resistance partial pressure and diode conduction voltage drop.
Diode ZD4 can be by VRDClamper prevents pressure drop excessively high, works as V in a threshold valueRDGreater than the clamp value of diode ZD4
When, VRDValue is clamp value, works as VRDWhen clamp value less than or equal to diode ZD4, VRDValue is electric resistance partial pressure and diode
The sum of conduction voltage drop, i.e.,
WhereinFor the clamp value of diode ZD4.
Further, it includes: signal (S1), signal (S11) and signal that 8. logic control circuit, which collects input signal,
(S13), after carrying out logic control and diagnosis, low-voltage control circuit is controlled by signal (S6) respectively and is 5. controlled with signal (S9)
Current detection circuit 6., guarantee high-voltage power circuit 3. in the isolation control of metal-oxide-semiconductor Q1, quick response, electric current real time monitoring and
Circuit self- recoverage, works normally device.
Wherein the response processing of signal (S1) uses the interruption controlling mechanism of logic control circuit 8., and guarantee event is quickly rung
It answers, the control of signal (S9) makes current detection circuit 6. can remove fault message, after guaranteeing failure vanishes, circuit self recovery
It works normally.
Further, under normal control working condition, 8. logic control circuit passes through signal (S6) control low voltage control
Circuit 5. in isolation optocoupler 05 be switched on or off, guarantee that two sides signal will not interfere with each other, further control high-voltage power electricity
Road 3. in metal-oxide-semiconductor Q1 be switched on or off.When logic control needs load equipment 9. to export, signal (S6) is low level, control
Signal (S12) processed is high voltage, 9. load equipment works；9. 7. state receives signal by feedback control circuit to load equipment
It (S13) is high level.Conversely, signal (S6) is high level when logic control does not need load equipment and 9. exports, signal is controlled
It (S12) is low-voltage, 9. load equipment does not work；The state of load equipment 9. passes through feedback control circuit 7. output signal
It (S13) is low level.
Further, under abnormal protection working condition, 8. logic control circuit passes through signal (S6) control low voltage control
Circuit 5. in isolation optocoupler 05 it is open-minded, control load equipment 9. work after, if there is overcurrent or short circuit phenomenon, electric current
Detection circuit 6. in detection chip U4 in the case where signal (S9) is high, output signal (S10) is low level, realizes overcurrent
Parameter adjustable section and signal quick response；
The current detection threshold that wherein signal (S10) is adjusted depends on the 15th endpoint of detection chip U4, setting the tenth
The input voltage V of five endpointsOCAdjustable current detection threshold value IOC, i.e.,
Wherein VDDTo control power end voltage, VOCValue is in (0.25--0.4) * VDD, unit mV；IOCFor current detecting threshold
Value, unit A, SensFor the sensitivity coefficient of detection chip U4, depending on the selection of detection chip U4, this example value 85mV/A.
Further, by drive amplification circuit, 4. output signal (S2) is low level to signal (S10) later, is further controlled
Current foldback circuit processed 2. in isolation optocoupler 04 it is open-minded, guarantee two sides signal will not interfere with each other, signal (S3) further control
3. high-voltage power circuit processed rapidly switches off, avoid the 3. middle metal-oxide-semiconductor Q1 damage of high-voltage power circuit；Signal (S2) further passed through
Current feedback circuit 1. in after RDC delay recovery goes out to handle, signal (S1) be output to logic control circuit 8. carry out logic and sentence
Disconnected, control isolation optocoupler 05 executes shutdown movement, 9. load equipment does not work, and realizes after short circuit that protection high-voltage power circuit is 3.
The function of metal-oxide-semiconductor Q1；Further load equipment is after 9. short circuit phenomenon disappears, self recovery normal operating conditions.
Further, in the case where monitoring working condition in real time, 8. 6. logic control circuit can receive in real time current detection circuit
Signal (S11) and feedback control circuit signal (S13) 7., carry out the work of metal-oxide-semiconductor Q1 in judging high-voltage power circuit 3.
State and job information.
Claims (3)
1. a kind of power device isolating and protecting device, which is characterized in that power supply 10. connect current foldback circuit 2., high-voltage power electricity
3., 2. 3. current foldback circuit connects high-voltage power circuit on road, 3. 6. high-voltage power circuit connects current detection circuit, electric current inspection
Slowdown monitoring circuit be 6. separately connected drive amplification circuit 4., feedback control circuit 7., logic control circuit 8., load equipment 9., load
9. reference end is grounded equipment, and 7. 8. feedback control circuit connects logic control circuit, 8. logic control circuit connects low voltage control
Circuit 5., 4. drive amplification circuit is separately connected current foldback circuit 2., excessively 1., cross current feedback circuit and 1. connect by current feedback circuit
Logic control circuit is 8..
2. a kind of power device isolating and protecting device according to claim 1, which is characterized in that the low-voltage control circuit
5. connect high-voltage power circuit 3., the common node of current foldback circuit 2., low-voltage control circuit 5. reference end ground connection.
3. a kind of power device isolating and protecting device according to claim 1, which is characterized in that the feedback control circuit
7. input terminal connection current detection circuit 6., the common node of load equipment 9., feedback control circuit 7. reference end ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910771454.1A CN110460012A (en) | 2019-08-20 | 2019-08-20 | A kind of power device isolating and protecting device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910771454.1A CN110460012A (en) | 2019-08-20 | 2019-08-20 | A kind of power device isolating and protecting device |
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| CN110460012A true CN110460012A (en) | 2019-11-15 |
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| CN201910771454.1A Pending CN110460012A (en) | 2019-08-20 | 2019-08-20 | A kind of power device isolating and protecting device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113839369A (en) * | 2021-10-28 | 2021-12-24 | 山东新一代信息产业技术研究院有限公司 | Robot driver MOS tube parallel protection circuit |
| CN115561560A (en) * | 2022-10-21 | 2023-01-03 | 南京信息工程大学 | Pure hardware implementation control circuit and control method for power device aging test |
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| CN113839369A (en) * | 2021-10-28 | 2021-12-24 | 山东新一代信息产业技术研究院有限公司 | Robot driver MOS tube parallel protection circuit |
| CN113839369B (en) * | 2021-10-28 | 2024-01-30 | 山东新一代信息产业技术研究院有限公司 | Driver MOS tube parallel protection circuit of robot |
| CN115561560A (en) * | 2022-10-21 | 2023-01-03 | 南京信息工程大学 | Pure hardware implementation control circuit and control method for power device aging test |
| CN115561560B (en) * | 2022-10-21 | 2023-09-22 | 南京信息工程大学 | Pure hardware implementation control circuit and control method for power device aging test |
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