CN108173248A - Switch protecting circuit - Google Patents
Switch protecting circuit Download PDFInfo
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- CN108173248A CN108173248A CN201810049404.8A CN201810049404A CN108173248A CN 108173248 A CN108173248 A CN 108173248A CN 201810049404 A CN201810049404 A CN 201810049404A CN 108173248 A CN108173248 A CN 108173248A
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- circuit
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- 230000005611 electricity Effects 0.000 claims description 6
- 238000003745 diagnosis Methods 0.000 description 6
- 230000008859 change Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 230000001960 triggered effect Effects 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000013024 troubleshooting Methods 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
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
- H02H7/22—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 distribution gear, e.g. bus-bar systems; for switching devices
- H02H7/222—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 distribution gear, e.g. bus-bar systems; for switching devices for switches
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/08—Modifications for protecting switching circuit against overcurrent or overvoltage
- H03K17/081—Modifications for protecting switching circuit against overcurrent or overvoltage without feedback from the output circuit to the control circuit
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- Electronic Switches (AREA)
Abstract
The present invention provides a kind of switch protecting circuit, switch protecting circuit includes comparator, AND gate circuit and controllable switch, and first control signal is provided to the positive input terminal of comparator and the input terminal of lower edge switch；Lower edge switch is closed or disconnects according to first control signal, so that lower edge switch exports second control signal；Second control signal replaces variation with first control signal current potential height；Comparator exports third control signal according to first control signal, and under normal circumstances, third control signal keeps low level, and in case of a fault, third control signal keeps high level；Second control signal and third control signal are provided to AND gate circuit, and AND gate circuit is provided to controllable switch according to the 4th control signal of second control signal and the output of third control signal, the 4th control signal；The controllable switch is closed or disconnects according to the described 4th control signal, and when the controllable switch is closed, one the 5th control signal is provided to the input terminal of the lower edge switch.
Description
Technical field
The present invention relates to analog electronics technique field, more particularly to a kind of switch protecting circuit.
Background technology
Fig. 1 is the low side driver circuit schematic diagram of PWM types, mainly by two part groups of low side driving circuit and diagnostic circuit
Into.Low side driving circuit is when the pwm signal S1 of master controller output is high level and passes through pull down resistor R3 and R4, C2 group
Into filter circuit, be provided to switch K1 input terminal 11 when, the load end 12 for switching K1 is connected over the ground, load 10 one end connection
Power supply Vbat, the other end 13 is since ground connection, load 10 are provided power, when S1 is low level, switchs the load end of K1
12 disconnect with ground, and for the electric current in load 10 by diode D1 afterflows, diode D1 provides afterflow for the high potential at node 13
Access, R1 are pull down resistor, for when switch K1 disconnections (switch off state when load is not in afterflow) and the load end
During 13 generation open fault, a stable low level is provided for load end 12, C1 is Electro-static Driven Comb capacitance.
The failure of low side driving circuit mainly has SCB (load end 13 is shorted to power supply), the SCG (load ends 13
It is shorted to ground) and OL (load end 13 is opened a way), for different switch fault states, diagnostic requirements are also different.
When low side driving circuit switch K1 is disconnected and (loaded the not switch off state in afterflow), master is provided to by signal S2 voltages
Controller, (S2 is high electricity to the SCG failures and OL failures that master controller is exported according to the low side of the level state of signal S2 diagnosis at this time
It is flat, but the load end 13 makes S2 be the low level close to zero with being shorted to, and since R1 pulls down original during the open circuit of load end 13
Because S2 is also made to be the low level close to zero)；(low side driving circuit PWM state, i.e., K1 is according to certain rule for lower edge switch K1 conductings
It is alternate to be closed and turn off) when, pass through SCB failures, SCG failures and OL failures that the diagnosable low side in master controller S2 ports exports
(S2 should be high and low level and alternately change at this time, but the load end 13 is shorted to power supply and S2 is made to be permanent High level, described negative
Carry terminal shortcircuit makes S2 be the lasting low level close to zero to ground or open circuit).
Damages of the SCB to master controller in this three classes failure during low side PWM state is maximum, and what the diagnosis on low side used
It is that the I/O port of MCU is connected to node 12 by R2, Diagnostic Strategy is by judging that the I/O port of MCU continues several PWM cycles
Low and high level changes to determine whether faulty presence.When there is low and high level variation in the sampling period, it is judged as normal condition；
If I/O port level is continues high in the sampling period, it is judged as that SCB failures occur；If I/O port level is low to continue in the sampling period
When, it is judged as that SCG failures or OL failures occurs (two failures of SCG and OL cannot be distinguished).If SCB failures really occur,
Acknowledging time is diagnosed as several milliseconds of even a few tens of milliseconds, short circuit current during which can reach tens of amperes, more than millisecond rank
Heavy current impact has following risk：It burns out lower edge switch, burn out PCB trace, more than the shutdown required by functional safety
Other security risk problems that time is caused.So for current Diagnostic Strategy, the timeliness of fault recognition and shutdown is very
Difference has the risk of damage controller.
Invention content
The purpose of the present invention is to provide a kind of switch protecting circuits, are shorted to solving existing lower edge switch output terminal
The problem of power failure diagnosing overlong time.
In order to solve the above technical problems, the present invention provides a kind of switch protecting circuit, the switch protecting circuit include than
Compared with device, AND gate circuit and controllable switch, wherein：
One first control signal is provided to the positive input terminal of the comparator and the input terminal of a lower edge switch；
The lower edge switch is closed or disconnects according to the first control signal, so that the second control of lower edge switch output
Signal processed；Under normal circumstances, the difference of the second control signal and the first control signal is more than first threshold；
The comparator exports third control signal, under normal circumstances, the third according to the first control signal
Signal is controlled to keep the first current potential, in case of a fault, the third control signal keeps the second current potential, and first current potential is low
In second current potential；
The second control signal and third control signal are provided to the AND gate circuit, the AND gate circuit according to
The 4th control signal of the second control signal and the output of third control signal, the 4th control signal is provided to described
Controllable switch；
The controllable switch is closed or disconnects according to the described 4th control signal, and the output terminal of the controllable switch is according to closing
The state closed or disconnected, the input terminal of one the 5th control signal of output to the lower edge switch.
Optionally, in the switch protecting circuit, the positive input terminal of the comparator connects the lower edge switch
Input terminal, the negative input end of the comparator input a reference voltage, and the reference voltage is more than the unlatching of the lower edge switch
Threshold voltage, and less than the voltage of first control signal after lower edge switch closure；The output terminal of the comparator passes through
Six resistance connect the AND gate circuit.
Optionally, in the switch protecting circuit, the output terminal of the comparator connects institute by a first resistor
State the output terminal of lower edge switch.
Optionally, in the switch protecting circuit, the lower edge switch further includes filter circuit and 3rd resistor, institute
It states filter circuit and includes the 4th resistance and the second capacitance, wherein：
One end input first control signal of the 3rd resistor, other end ground connection；
One end input first control signal of 4th resistance, the other end connect the input terminal of the lower edge switch；
One end of second capacitance connects the input terminal of the lower edge switch, other end ground connection.
Optionally, in the switch protecting circuit, the first control signal is exported by the first of a master controller
End provides, and the second output terminal of the master controller provides the 6th control signal.
Optionally, in the switch protecting circuit, the first input end of the AND gate circuit is connected by the 7th resistance
The output terminal of the lower edge switch is connect, the second input terminal of the AND gate circuit passes through the two or two by the 4th capacity earth
Pole pipe connects the second output terminal of the master controller.
Optionally, in the switch protecting circuit, the first input end of the AND gate circuit passes through third diode
Supply voltage is connected, the second input terminal of the AND gate circuit connects supply voltage by the 4th diode.
Optionally, in the switch protecting circuit, the output terminal of the AND gate circuit connects the sun of the 5th diode
Pole, the second input terminal of the AND gate circuit connect the cathode of the 5th diode.
Optionally, in the switch protecting circuit, the input terminal of the controllable switch connects institute by the 8th resistance
The output terminal of AND gate circuit is stated, the output terminal of the controllable switch connects the output terminal of the lower edge switch.
Optionally, in the switch protecting circuit, the second end of one load of output terminal connection of the lower edge switch,
The first end connection battery supply of the load, the second end of the load is by one first capacity earth, and the of the load
One end connects the cathode of one first diode, and the second end of the load connects the anode of first diode.
In switch protecting circuit provided by the invention, under normal circumstances, second control signal and first control signal
Difference be more than first threshold, i.e. second control signal and first control signal current potential height replace variation, controls and believes when first
Number be high level when, second control signal is low level, and vice versa；Under normal circumstances, third control signal keeps first
Current potential (low potential), the second control signal and third control signal are provided to the AND gate circuit, and AND gate circuit is defeated
The 4th control signal gone out is necessarily low level, and controllable switch remains open；When lower edge switch output terminal is shorted to power failure
During appearance, since third control signal keeps the second current potential (high potential) in case of a fault, since second control signal is
High level failing edge can't occur with the rising edge of first control signal, then AND gate circuit output high level, controllably
Switch is closed, the output terminal ground connection of controllable switch, is formed low level 5th control signal and is provided to the lower edge switch
Input terminal, lower edge switch output disconnect, and protect lower edge switch and entire circuit.
Description of the drawings
Fig. 1 is existing lower edge switch drive circuit schematic diagram；
Fig. 2 is one embodiment of the invention lower edge switch drive circuit schematic diagram.
Specific embodiment
Switch protecting circuit proposed by the present invention is described in further detail below in conjunction with the drawings and specific embodiments.Root
According to following explanation and claims, advantages and features of the invention will become apparent from.It should be noted that attached drawing is using very simple
The form of change and using non-accurate ratio, only for the purpose of facilitating and clarifying the purpose of the embodiments of the invention.
The core concept of the present invention is to provide a kind of switch protecting circuit, short to solve existing lower edge switch output terminal
Road is to power failure diagnosing overlong time, the problem of so as to damage load.
To realize above-mentioned thought, the present invention provides a kind of switch protecting circuit, the switch protecting circuit includes comparing
Device, AND gate circuit and controllable switch, wherein：One first control signal is provided to the positive input terminal of the comparator and a low side is opened
The input terminal of pass；The lower edge switch is closed or disconnects according to the first control signal, so that lower edge switch output the
Two control signals；Under normal circumstances, the difference of the second control signal and the first control signal is more than first threshold；
The comparator exports third control signal according to the first control signal, and under normal circumstances, the third controls signal
The first current potential is kept, in case of a fault, third control signal keeps the second current potential, and first current potential is less than described the
Two current potentials；The second control signal and third control signal are provided to the AND gate circuit, the AND gate circuit according to
The 4th control signal of the second control signal and the output of third control signal, the 4th control signal is provided to described
Controllable switch；The controllable switch is closed or disconnects according to the described 4th control signal, the output terminal of the controllable switch according to
The state for being closed or disconnecting, the input terminal of one the 5th control signal of output to the lower edge switch.
High level in the present embodiment refers to level value for 5V or so or higher than 5V, and low level refers to 0V or ground connection.
The present embodiment provides a kind of switch protecting circuit, as shown in Fig. 2, the switch protecting circuit include comparator U1,
AND gate circuit U2 and controllable switch K2, wherein：One first control signal S1 is provided to 15 He of positive input terminal of the comparator U1
The input terminal 11 of one lower edge switch K1；The lower edge switch K1 is closed or disconnects according to the first control signal S1, so that institute
State lower edge switch K1 output second control signals S2；Under normal circumstances, the second control signal S2 and the described first control
The difference of signal S1 is more than first threshold；The comparator U1 exports third control signal according to the first control signal S1
S3, under normal circumstances, the third control signal S3 keep the first current potential (low level), in case of a fault, the third
Signal S3 is controlled to keep the second current potential (high level), first current potential is less than second current potential；The second control signal
S2 and third control signal S3 are provided to the AND gate circuit U2, and the AND gate circuit U2 is according to the second control signal
S2 and third control signal S3 outputs the 4th control signal S4, the 4th control signal S4 are provided to the controllable switch
K2；The controllable switch K2 is closed or disconnects according to the described 4th control signal S4, and the output terminal of the controllable switch is according to closing
The state closed or disconnected, the input terminal 11 of one the 5th control signal S5 to the lower edge switch K1 of output.
In switch protecting circuit in the present embodiment, the output terminal of comparator U1 is open collector (OC) structure, just defeated
The transistor collector for entering outlet internal when being less than negative input is conducting to ground, that is, exports low level；Positive input is more than negative input
When outlet internal transistor close, i.e. for high-impedance state, output voltage needs pull-up electricity by external circuit structures shape for output
Resistance can just have the ability of external output current.Therefore, when first control signal is high level, the output terminal of comparator U1 is height
Resistance state, under normal circumstances, second control signal are low level, then the output terminal of comparator U1 is also low level, in failure feelings
Under condition, second control signal is high level, then the output terminal of comparator U1 is high level.
In switch protecting circuit provided in this embodiment, under normal circumstances, the controls of second control signal S2 and first
The difference of signal S1 is more than first threshold, i.e. second control signal S2 replaces variation with first control signal S1 current potentials height, when
When first control signal S1 is high level, second control signal S2 is low level, and vice versa；Under normal circumstances, third control
Signal S3 processed keeps the first current potential (low potential), and the second control signal S2 and third control signal S3 are provided to described
4th control signal S4 of AND gate circuit U2, AND gate circuit U2 output is necessarily low level, and controllable switch K2 is remained open；When low
When side switch K1 output terminals are shorted to power failure and occur, since third control signal S3 keeps the second current potential in case of a fault
(high potential) since second control signal S2 is high level, can't go out with the rising edge of first control signal S1
Existing failing edge, then AND gate circuit U2 outputs high level, controllable switch K2 closures, the output terminal ground connection of controllable switch K2 are formed low
5th control signal S5 of level is provided to the input terminal of the lower edge switch K1, and lower edge switch K1 outputs are disconnected, protected
Lower edge switch K1 and entire circuit.
Specifically, in the switch protecting circuit, the positive input terminal 15 of the comparator U1 connects the low side and opens
The input terminal 11 of K1 is closed, the negative input end 14 of the comparator U1 inputs a reference voltage, and the reference voltage is by being connected to power supply
What second resistance R2 and the 5th resistance R5 between voltage VDD and ground were divided and were formed, the negative input end 14 of the comparator U1
The junction of second resistance R2 and the 5th resistance R5 is connected, the output terminal of the comparator U1 passes through described in the 6th resistance R6 connections
AND gate circuit U2.
Further, the reference voltage should be slightly larger than the turn on voltage threshold of lower edge switch K1, in circuit design easily
Problem arises in that it is possible that caused by " competition " accidentally during the first control signal of master controller is by low increase
Diagnosis, i.e., when master controller is when providing first control signal S1, due to comparator U1 reference voltage choosing it is too low, lead to S1
The output terminal that comparator is first triggered in signal uphill process is converted to high-impedance state, and lower edge switch does not have enough time also becoming at this time
Change, S2 signals are also maintained at high level, therefore S3 also becomes high level, then AND gate circuit U2 exports high level, and control is controllably opened
It closes K2 to be closed, entire circuit is made to be locked in the state of lower edge switch disconnection, and AND gate circuit output terminal passes through the 5th transistor D5
Its second input terminal is locked on high level.By the way that the negative input end voltage of comparator is arranged to a little higher than lower edge switch
Turn on voltage threshold can effectively avoid the problem that wrong diagnosis, i.e., described reference voltage is more than the unlatching threshold of the lower edge switch
Threshold voltage, and less than the voltage of first control signal after lower edge switch closure, first control signal S1 is opened in master controller
When opening by low level, reach the turn-on threshold voltage of lower edge switch first, lower edge switch is closed, and then just reaches comparator
Turnover voltage, effectively prevent wrong diagnosis.
Specifically, in the switch protecting circuit, the output terminal of the comparator U1 is connected by a first resistor R1
Connect the output terminal 12 of the lower edge switch K1.The lower edge switch K1 further includes filter circuit and 3rd resistor R3, R3 are drop-downs
Resistance, when ensureing master controller non-output signal, S1 keeps low potential due to the effect of third pull down resistor, the filtered electrical
Road includes the 4th resistance R4 and the second capacitance C2, wherein：One end input first control signal S1 of the 3rd resistor R3, it is another
End ground connection；One end input first control signal S1 of the 4th resistance R4, the other end connect the input of the lower edge switch K1
End 11；One end of the second capacitance C2 connects the input terminal 11 of the lower edge switch K1, other end ground connection.
In addition, in the switch protecting circuit, the first control signal S1 is exported by the first of a master controller
End provides, and the second output terminal of the master controller provides the 6th control signal S6.The first input end of the AND gate circuit U2
16 are passed through by the output terminal 12 of the 7th resistance R7 connections lower edge switch K1, the second input terminal 17 of the AND gate circuit U2
4th capacitance C4 is grounded, and by the second output terminal of the second diode D2 connections master controller, that is, inputs the 6th control
Signal S6, the 6th controls signal S6 to keep high level under normal circumstances, after failure and trouble shooting, needs main control
The low level 6th control signal of second output terminal output of device, when the 6th control signal is low level, AND gate circuit second
The current potential of input terminal 17 is also for low level, a diode turn-on voltage higher than the 6th control signal, then AND gate circuit U2 is again
Restore output low level.
Further, in the switch protecting circuit, the first input end 16 of the AND gate circuit U2 passes through
The second input terminal 17 of three diode D3 connection supply voltages VDD, the AND gate circuit U2 passes through the 4th diode D4 connections electricity
Source voltage VDD.When the current potential of first input end 16 is excessively high, pass through the clamper of third diode D3, the electricity of first input end 16
Position is maintained near supply voltage VDD, and the voltage of protection AND gate circuit input terminal prevents AND gate circuit from damaging less than certain threshold value
It is bad.When the current potential of the second input terminal 17 is excessively high, by the clamper of the 4th diode D4, the current potential of the second input terminal 17 is maintained at
Near supply voltage VDD, the second output terminal of AND gate circuit and master controller is protected not impacted by high current, prevented and door
Circuit and the damage of master controller I/O port.
In addition, in the switch protecting circuit, the output terminal of the AND gate circuit U2 connects the 5th diode D5's
Anode, the second input terminal 17 of the AND gate circuit U2 connect the cathode of the 5th diode D5.When AND gate circuit exports height
During level, high level signal is provided to the second input terminal 17 by the 5th diode D5, and the second input terminal 17 is made to keep high level,
If the 16 of U2 are also high level (SCB failures) at this time, then the output voltage of AND gate circuit is locked on high level.
As shown in Fig. 2, in the switch protecting circuit, the input terminal of the controllable switch K2 passes through the 8th resistance R8
The output terminal of the AND gate circuit U2 is connected, the output terminal of the controllable switch K2 connects the input terminal of the lower edge switch K1.
The second end 13 of one load 10 of output terminal connection of the lower edge switch K1, the first end connection battery supply of the load 10
Vbat, battery supply Vbat provide power input for load 10, and the second end 13 of the load 10 is connect by one first capacitance C1
Ground, the first end of the load 10 connect the cathode of one first diode D1, the second end connection described first of the load 10
The anode of diode D1.Supply voltage VDD is 5V voltage sources.
After circuit being rapidly switched off by low side of the increase based on comparator, SCB fault diagnosises processing when working for PWM
Microsecond grade is shorten to by former Millisecond, the PCB trace of lower edge switch and entire circuit is protected, avoids the damage of controller, together
When can also meet the strict demands of ISO26262 functional safeties.
Master controller can monitor whether to break down by the level state of S7.Low side driving circuit switch K1 is disconnected
When (loading the not switch off state in afterflow), master controller is provided to by signal S7 voltages, master controller is according to letter
The level state of number S7 diagnose low side output SCG failures and OL failures (normal condition S7 is high level, but the load end 13
Making S7 with being shorted to is the low level close to zero, and since S3 is the low level and resistance close to zero during the open circuit of load end 13
Also it is the low level close to zero to make S7 the reason of R1 are connected with S3)；Lower edge switch K1 conductings (low side driving circuit PWM state,
That is K1 is alternately closed and turns off according to certain rule) when, pass through the SCB events of the diagnosable low side output in master controller S7 ports
(S7 should be high and low level and alternately change at this time, but the load end 13 is shorted to power supply and makes the S7 be for barrier, SCG failures and OL failures
High level, the load end, which is shorted to ground or open circuit, makes S7 be the low level close to zero).SCB failures can be triggered and be rapidly switched off
And the state that failure is kept to lock.After failure vanishes, master controller can by S6 export low level be resetted, at this time with door
Input pin 17 is pulled low, and realizes fault unlock, you can shutdown controllable switch K2, low side driving continue to work normally.
To sum up, the various configuration of switch protecting circuit is described in detail in above-described embodiment, and certainly, the present invention includes
But be not limited in above-mentioned implementation cited configuration, converted on the basis of any configuration provided in above-described embodiment in
Hold, belong to the range that the present invention is protected.Those skilled in the art can draw inferences about other cases from one instance according to the content of above-described embodiment.
Foregoing description is only the description to present pre-ferred embodiments, not to any restriction of the scope of the invention, this hair
Any change, the modification that the those of ordinary skill in bright field does according to the disclosure above content, belong to the protection of claims
Range.
Claims (10)
1. a kind of switch protecting circuit, which is characterized in that the switch protecting circuit includes comparator, AND gate circuit and controllably opens
It closes, wherein：
One first control signal is provided to the positive input terminal of the comparator and the input terminal of a lower edge switch；
The lower edge switch is closed or disconnects according to the first control signal, so that lower edge switch output the second control letter
Number；Under normal circumstances, the difference of the second control signal and the first control signal is more than first threshold；
The comparator exports third control signal according to the first control signal, under normal circumstances, the third control
Signal keeps the first current potential, and in case of a fault, the third control signal keeps the second current potential, and first current potential is less than institute
State the second current potential；
The second control signal and third control signal are provided to the AND gate circuit, and the AND gate circuit is according to
The 4th control signal of second control signal and the output of third control signal, the 4th control signal is provided to described controllable
Switch；
The controllable switch is closed or disconnects according to the described 4th control signal, the output terminal of the controllable switch according to being closed or
The state of disconnection, the input terminal of one the 5th control signal of output to the lower edge switch.
2. switch protecting circuit as described in claim 1, which is characterized in that the positive input terminal connection of the comparator is described low
The input terminal of side switch, the negative input end of the comparator input a reference voltage, and the reference voltage is opened more than the low side
The turn-on threshold voltage of pass, and less than the voltage of first control signal after lower edge switch closure；The output of the comparator
End connects the AND gate circuit by the 6th resistance.
3. switch protecting circuit as described in claim 1, which is characterized in that the output terminal of the comparator passes through one first electricity
Resistance connects the output terminal of the lower edge switch.
4. switch protecting circuit as described in claim 1, which is characterized in that the lower edge switch further includes filter circuit and
Three resistance, the filter circuit include the 4th resistance and the second capacitance, wherein：
One end input first control signal of the 3rd resistor, other end ground connection；
One end input first control signal of 4th resistance, the other end connect the input terminal of the lower edge switch；
One end of second capacitance connects the input terminal of the lower edge switch, other end ground connection.
5. switch protecting circuit as described in claim 1, which is characterized in that the first control signal is by a master controller
First output terminal provides, and the second output terminal of the master controller provides the 6th control signal.
6. switch protecting circuit as claimed in claim 5, which is characterized in that the first input end of the AND gate circuit passes through
Seven resistance connect the output terminal of the lower edge switch, and the second input terminal of the AND gate circuit is led to by the 4th capacity earth
Cross the second output terminal that the second diode connects the master controller.
7. switch protecting circuit as claimed in claim 6, which is characterized in that the first input end of the AND gate circuit passes through
Three diodes connect supply voltage, and the second input terminal of the AND gate circuit connects supply voltage by the 4th diode.
8. switch protecting circuit as claimed in claim 7, which is characterized in that the output terminal connection the five or two of the AND gate circuit
The anode of pole pipe, the second input terminal of the AND gate circuit connect the cathode of the 5th diode.
9. switch protecting circuit as described in claim 1, which is characterized in that the input terminal of the controllable switch passes through the 8th electricity
Resistance connects the output terminal of the AND gate circuit, and the output terminal of the controllable switch connects the output terminal of the lower edge switch.
10. switch protecting circuit as described in claim 1, which is characterized in that the output terminal connection one of the lower edge switch is negative
The second end of load, the first end connection battery supply of the load, the second end of the load pass through one first capacity earth, institute
The first end for stating load connects the cathode of one first diode, and the second end of the load connects the sun of first diode
Pole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810049404.8A CN108173248B (en) | 2018-01-18 | 2018-01-18 | Switch protection circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810049404.8A CN108173248B (en) | 2018-01-18 | 2018-01-18 | Switch protection circuit |
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| CN108173248A true CN108173248A (en) | 2018-06-15 |
| CN108173248B CN108173248B (en) | 2023-11-10 |
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| CN108173248B (en) | 2023-11-10 |
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