CN108205100A - A kind of circuit checker - Google Patents
A kind of circuit checker Download PDFInfo
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- CN108205100A CN108205100A CN201611169544.6A CN201611169544A CN108205100A CN 108205100 A CN108205100 A CN 108205100A CN 201611169544 A CN201611169544 A CN 201611169544A CN 108205100 A CN108205100 A CN 108205100A
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- 238000001514 detection method Methods 0.000 claims abstract description 46
- 230000005611 electricity Effects 0.000 claims description 20
- 230000003321 amplification Effects 0.000 claims description 6
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 6
- 230000005856 abnormality Effects 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000000087 stabilizing effect Effects 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/2801—Testing of printed circuits, backplanes, motherboards, hybrid circuits or carriers for multichip packages [MCP]
- G01R31/2806—Apparatus therefor, e.g. test stations, drivers, analysers, conveyors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/2801—Testing of printed circuits, backplanes, motherboards, hybrid circuits or carriers for multichip packages [MCP]
- G01R31/281—Specific types of tests or tests for a specific type of fault, e.g. thermal mapping, shorts testing
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/2801—Testing of printed circuits, backplanes, motherboards, hybrid circuits or carriers for multichip packages [MCP]
- G01R31/281—Specific types of tests or tests for a specific type of fault, e.g. thermal mapping, shorts testing
- G01R31/2812—Checking for open circuits or shorts, e.g. solder bridges; Testing conductivity, resistivity or impedance
Abstract
The present invention relates to circuit detection technique field, more particularly to a kind of circuit checker.Institute's circuit checker includes overcurrent sample circuit, amplifying circuit, level comparison circuit, over-voltage detection circuit, short-circuit detecting circuit and level shifting circuit；The overcurrent sample circuit for acquiring current sample, the amplifying circuit for being amplified to the current sample acquired, the level comparison circuit for the amplified current sample to be compared with reference voltage, detect current sample whether overcurrent；Whether the over-voltage detection circuit and short-circuit detecting circuit are respectively used to detection circuit over-pressed or short-circuit；The level shifting circuit is used to export corresponding level signal according to the testing result of the level comparison circuit, over-voltage detection circuit or/and short-circuit detecting circuit.The present invention can be carried out at the same time overcurrent, overvoltage and the detection of the circuit abnormality of short circuit, so as to fulfill multi-faceted protection.
Description
Technical field
The present invention relates to circuit detection technique field, more particularly to a kind of circuit checker.
Background technology
With advances in technology, current electronic product is more and more accurate, and integration degree is higher and higher, and volume is also more next
Smaller, the requirement of stability, reliability and safety to circuit is also higher and higher.And in order to meet these requirements, it needs
Various protection circuits are added in electronic product.
At present, most common protection circuit includes overcurrent, overvoltage and short-circuit protection circuit, but the prior art in electronic product
In, protect circuit precision not high or adjustment is inconvenient or protection type is few or above-mentioned, and can reach simultaneously
The product price of these purposes is again very high, and the production cost for leading to electronic product is higher.
Invention content
The purpose of the present invention is to provide a kind of circuit checkers, it is intended to solve the prior art at least to a certain extent
In one of above-mentioned technical problem.
To solve the above-mentioned problems, the present invention provides following technical solutions：
A kind of circuit checker, including overcurrent sample circuit, amplifying circuit, level comparison circuit, over-voltage detection circuit,
Short-circuit detecting circuit and level shifting circuit；For acquiring current sample, the amplifying circuit is used for the overcurrent sample circuit
The current sample acquired is amplified, the level comparison circuit is used for the amplified current sample and benchmark electricity
Pressure is compared, detection current sample whether overcurrent；The over-voltage detection circuit and short-circuit detecting circuit are respectively used to detection electricity
Whether road is over-pressed or short-circuit；The level shifting circuit is used for according to the level comparison circuit, over-voltage detection circuit or/and short
The testing result of alignment detection circuit exports corresponding level signal.
The technical solution that the embodiment of the present invention is taken further includes processor, and the processor is used for according to the level conversion
The level signal decision circuitry of circuit output if there is exception, then sends out instruction and performs protection act with the presence or absence of exception.
The technical solution that the embodiment of the present invention is taken further includes：The overcurrent sample circuit includes first resistor, described to put
Big circuit includes second resistance, first resistor one end ground connection, and the other end connects the cathode and second resistance of load respectively；
The electric current of the load is flowed through from first resistor, and pressure drop is generated in first resistor, obtains the current sample of load current.
The technical solution that the embodiment of the present invention is taken further includes：The amplifying circuit further includes 3rd resistor, the 4th resistance
With the first operational amplifier, the level comparison circuit further includes the 5th resistance；One end of the second resistance connects respectively
One resistance and the cathode of load, the other end connect the 3rd foot of the first operational amplifier；One end of the 3rd resistor connects respectively
2nd foot of the first operational amplifier and the 4th resistance, the other end connect the 1st foot and the 5th electricity of the first operational amplifier respectively
Resistance；One end ground connection of 4th resistance, the other end connect the 2nd foot of 3rd resistor and the first operational amplifier respectively；It is described
Second resistance is used to the current sample being delivered to the first operational amplifier, and first operational amplifier is used for the electricity
Stream sample is amplified processing, and exports to the level comparison circuit.
The technical solution that the embodiment of the present invention is taken further includes：The level comparison circuit further includes the 6th resistance, three ends
Voltage-stablizer and second operational amplifier, one end of the 5th resistance connect the 1st foot and third of the first operational amplifier respectively
Resistance, the other end connect the 6th foot of the second operational amplifier；One end connection power supply of 6th resistance, the other end connect
Connect the 2nd foot of three terminal regulator.
The technical solution that the embodiment of the present invention is taken further includes：The level comparison circuit further includes the 7th resistance, the 8th
Resistance and capacitance, the level shifting circuit further include the first diode；One end connection power supply of 7th resistance, the other end
The 6th foot of the 3rd foot of the three terminal regulator, capacitance and second operational amplifier is connected respectively；One end of 8th resistance
Power supply is connected, the other end connects the 7th foot of the second operational amplifier and the anode of the first diode respectively.
The technical solution that the embodiment of the present invention is taken further includes：The 1st foot ground connection of the three terminal regulator, the connection of the 2nd foot
6th resistance, the 3rd foot connect the 6th foot of capacitance, the 7th resistance and second operational amplifier respectively；The second operational amplifier
The 4th foot ground connection, the 5th foot connects the 5th resistance, and the 6th foot connects the 3rd foot of capacitance, the 7th resistance and three terminal regulator respectively,
7th foot connects the anode of the 8th resistance and the first diode respectively, and the 8th foot connects power supply；The three terminal regulator is used to generate base
Quasi- voltage, institute's second operational amplifier is for the amplified current sample to be compared with reference voltage, if described
Amplified current sample voltage is higher than reference voltage, and the second operational amplifier exports high electricity to the level shifting circuit
It is flat；If the amplified current sample voltage is less than reference voltage, the second operational amplifier is to the level conversion
Circuit output low level.
The technical solution that the embodiment of the present invention is taken further includes：The level shifting circuit further includes the 9th resistance, the tenth
Resistance, the second diode and triode, the over-voltage detection circuit further include zener diode；One end of 9th resistance connects
The cathode of the first diode is connect, the other end connects the base stage of the tenth resistance and triode respectively；One end of tenth resistance
The cathode of the second diode is connected, the other end connects the base stage of the 9th resistance and triode respectively；First diode is just
Pole connects the 8th resistance and the 7th foot of second operational amplifier respectively, and cathode connects the 9th resistance；Second diode is just
Pole connects the anode of zener diode, and cathode connects the tenth resistance；The level of the second operational amplifier output passes through first
Diode and the 9th resistance are delivered to triode, defeated to the processor if what the triode received is high level
Go out low level；If what the triode received is low level, high level is exported to the processor.
The technical solution that the embodiment of the present invention is taken further includes：The anode of the zener diode connects the two or two pole
The anode of pipe, the anode of cathode connection load；When the voltage of load is more than the value of the zener diode, two pole of voltage stabilizing
Pipe exports high level, the triode ON to the level shifting circuit, and exports low level to the processor.
The technical solution that the embodiment of the present invention is taken further includes：The short-circuit detecting circuit further includes third diode, institute
The anode for stating third diode connects the collector and processor of the triode, the anode of cathode connection load respectively；If
Short circuit occurs for load, and the cathode of institute's third diode is pulled to low level, and the collector of the triode passes through the described 3rd 2
Pole pipe is pulled to low level, and exports low level to the processor.
Relative to the prior art, the advantageous effect that the embodiment of the present invention generates is：The circuit detection of the embodiment of the present invention
Device and is exported testing result to processor using the state of the electric current of the real-time observation circuit of discrete component, voltage and circuit,
Corresponding protection act is made according to received state by processor.The present invention can be carried out at the same time overcurrent, overvoltage and short circuit
Circuit abnormality detection, so as to fulfill multi-faceted protection；Due to being made of discrete component, various parameters are easy to adjust, inspection
It is high to survey precision, and simple circuit, at low cost, reliability is high.
Description of the drawings
Fig. 1 is the structure diagram of the circuit checker of the embodiment of the present invention；
Fig. 2 is the circuit diagram of the circuit checker of the embodiment of the present invention.
Specific embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to the accompanying drawings and embodiments, it is right
The present invention is further elaborated.It should be appreciated that specific embodiment described herein is only to explain the present invention, not
For limiting the present invention.
Referring to Fig. 1, it is the structure diagram of the circuit checker of the embodiment of the present invention.The circuit of the embodiment of the present invention
Detection device includes overcurrent sample circuit 100, amplifying circuit 200, level comparison circuit 300, over-voltage detection circuit 400, short circuit
Detection circuit 500, level shifting circuit 600 and processor 700；Wherein, (figure is not for a terminating load of overcurrent sample circuit 100
Show) cathode, it is another termination amplifying circuit 200；Stream sample circuit 100 is taken in one end of amplifying circuit 200, and the other end is connected to
Level comparison circuit 300；One termination amplifying circuit 200 of level comparison circuit 300, the other end is connected to level shifting circuit
600；One end of over-voltage detection circuit 400 and short-circuit detecting circuit 500 connects the anode of load respectively, and the other end is connected respectively to electricity
Flat conversion circuit 600；One end of level shifting circuit 600 respectively with level comparison circuit 300, over-voltage detection circuit 400 and short
Alignment detection circuit 500 connects, and the other end is connect with processor 700.
Overcurrent sample circuit 100 is used to obtain current sample at the cathode of load, and exporting current sample into amplification
Circuit 200；Amplifying circuit 200 is used to be amplified current sample, and export to level amplified current sample and compare
Circuit 300；Level comparison circuit 300 for current sample and reference voltage to be compared, detect current sample whether overcurrent,
And according to testing result to 600 outputs level signals of level shifting circuit；Over-voltage detection circuit 400 is used to detect load voltage
No is more than the circuit of setting, and detection level is exported to level shifting circuit 600；Short-circuit detecting circuit 500 is negative for detecting
It whether carries in short-circuit condition, and detection level is exported to level shifting circuit 600；Level shifting circuit 600 is used for basis
The detection level that level comparison circuit 300, over-voltage detection circuit 400 and short-circuit detecting circuit 500 input is exported to processor 700
Whether corresponding level signal, the level signal that processor 700 is used to be inputted according to level shifting circuit 600 judge load circuit
It there are exception, then sends out instruction if there is abnormal and performs protection act, so as to fulfill to the overcurrent of load circuit, overvoltage and short
The detection and protection on road.
It is the circuit diagram of the circuit checker of the embodiment of the present invention also referring to Fig. 2.Specifically, overcurrent sample electricity
Road 100 includes first resistor R1, and to reduce the influence to load circuit, first resistor R1 is a high-power, milliohm rank
Small resistance value sample resistance, first resistor R1 one end ground connection, the other end meets the cathode of load and second resistance R2 respectively.It is negative
The electric current of load is flowed through from first resistor R1, is generated pressure drop on first resistor R1, is converted electrical current into voltage, so as to obtain load
The current sample of electric current.
Amplifying circuit 200 includes second resistance R2,3rd resistor R3, the 4th resistance R4 and the first operational amplifier U1-A；
One end of second resistance R2 connects first resistor R1 and the cathode of load respectively, another to terminate the 3rd of the first operational amplifier U1-A
Foot；The 2nd foot and the 4th resistance R4 of a first operational amplifier U1-A of termination of 3rd resistor R3, the first operation of another termination are put
The 1st foot and the 5th resistance R5 of big device U1-A；One end ground connection of 4th resistance R4, another termination 3rd resistor R3 and the first operation
The 2nd foot of amplifier U1-A；The 1st foot of first operational amplifier U1-A connects 3rd resistor R3 and the 5th resistance R5, the 2nd foot respectively
3rd resistor R3 and the 4th resistance R4 is met respectively, and the 3rd foot meets second resistance R2；Second resistance R2,3rd resistor R3, the 4th resistance
R4 and the first operational amplifier U1-A forms an in-phase voltage amplifying circuit.
Level comparison circuit 300 is steady including the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, the 8th resistance R8, three ends
Depressor U2, capacitance C1, second operational amplifier U1-B；Wherein, the one of the 5th resistance R5 terminates the first operational amplifier U1-A's
1st foot and 3rd resistor R3, the 6th foot of another termination second operational amplifier U1-B；A termination power of 6th resistance R6, separately
The 2nd foot of one termination three terminal regulator U2；A termination power of 7th resistance R7, the other end connect the of three terminal regulator U2 respectively
6th foot of 3 feet, capacitance C1 and second operational amplifier U1-B；A termination power of 8th resistance R8, the other end connect second respectively
The 7th foot of operational amplifier U1-B and the anode of the first diode D1；The 1st foot ground connection of three terminal regulator U2, the 2nd foot connect the
Six resistance R6, the 3rd foot connect the 6th foot of capacitance C1, the 7th resistance R7 and second operational amplifier U1-B respectively；Second operation amplifier
The 4th foot ground connection of device U1-B, the 5th foot meet the 5th resistance R5, and the 6th foot connects capacitance C1, the 7th resistance R7 and three terminal regulator respectively
The 3rd foot, the 7th foot connects the anode of the 8th resistance R8 and the first diode D1, and the 8th foot connects power supply；Three terminal regulator U2, the 6th electricity
Resistance R6, the 7th resistance R7 and capacitance C1 together constitute a reference voltage generating circuit.
Over-voltage detection circuit 400 includes zener diode Z1, and the anode of zener diode Z1 is meeting the second diode D2 just
Pole, cathode connect the anode of load.
Short-circuit detecting circuit 500 includes third diode D3, and the anode of third diode D3 connects the collection of triode Q1 respectively
Electrode and state output (processor 700), cathode connect the anode of load.
Level shifting circuit 600 include the 9th resistance R9, the tenth resistance R10, the first diode D1, the second diode D2 and
Triode Q1.Wherein, the 9th resistance R9 one termination the first diode D1 cathode, the other end connect respectively the tenth resistance R10 and
The base stage of triode Q1；Tenth resistance R10 one termination the second diode D2 cathode, the other end connect respectively the 9th resistance R9 and
The base stage of triode Q1；The anode of first diode D1 connects the 7th foot of the 8th resistance R8 and second operational amplifier U1-B respectively,
Cathode meets the 9th resistance R9；The anode of second diode D2 connects the anode of zener diode Z1, and cathode meets the tenth resistance R10；Three
The base stage of pole pipe Q1 meets the 9th resistance R9 and the tenth resistance R10 respectively, and the collector of triode Q1 meets third diode D3 respectively
Anode and state output (processor 700), triode Q1 emitter ground connection.
The operation principle of the circuit checker of the embodiment of the present invention is：The first resistor R1 of overcurrent sample circuit 100 from
After obtaining current sample at the cathode of load, it is output to amplifying circuit 200；The second electricity that current sample passes through amplifying circuit 200
Resistance R2 is conveyed to the first operational amplifier U1-A, and processing is amplified by the first operational amplifier U1-A；Wherein, current sample
Amplification factor is determined by 3rd resistor R3 and the 4th resistance R4, by adjusting the amplification factor of amplifying circuit, can be set
The current value of stream, in the case where reference voltage determines, amplification factor is bigger, and current sample is just put bigger, easier to be super
Reference voltage is crossed, and once amplified, current sample is more than reference voltage, will be considered in overcurrent, so overcurrent value is got over
It is small.Current sample is output to level comparison circuit 300 after the amplification of amplifying circuit 200；Pass through level comparison circuit 300
Three terminal regulator U2 generates a 2.5V reference voltage (this voltage accuracy is high, is not influenced by power supply voltage variation), by the base
Quasi- control source is to the 6th foot of second operational amplifier U1-B, while amplified current sample also enters into the second operation and puts
The 5th foot of big device U1-B；The two voltages are compared by second operational amplifier U1-B, while the 8th resistance R8 gives second
The 7th foot of operational amplifier U1-B adds in a pull-up level；If the current sample voltage of the 5th foot is higher than the benchmark of the 6th foot
Voltage, the 7th foot of second operational amplifier U1-B just export high level to level shifting circuit 600, will be sentenced by processor 700
Break as overcurrent；If the current sample voltage of the 5th foot is less than the reference voltage of the 6th foot, the 7th foot of second operational amplifier U1-B
Low level just is exported to level shifting circuit 600, will be judged as by processor 700 normally.Second operational amplifier U1-B is defeated
The level gone out is delivered to triode Q1 by the first diode D1 and the 9th resistance R9, if what the base stage of triode Q1 received
It is high level, triode Q1 is connected, its collector can export low level to processor 700, then processor 700 is judged as circuit
It is abnormal, then perform protection act.If what the base stage of triode Q1 received is low level, triode Q1 cut-offs, its collection
Electrode can export high level to processor 700, then processor 700 is judged as that circuit is normal, does not make any action.So as to fulfill right
The detection and protection of the overcurrent of load circuit.In circuit, the first diode D1 and the second diode D2 play buffer action, the
One diode D1, which prevents the level of over-voltage detection circuit 400 to be flowed into the 300, the 2nd 2 pole D2 of level comparison circuit, prevents level ratio
Level compared with circuit 300 is flowed into over-voltage detection circuit 400；The effect of 9th resistance R9 and the tenth resistance R10 is current limliting, respectively
Prevent the electric current that level comparison circuit 300 is exported with over-voltage detection circuit 400 from being damaged to triode Q1.
Simultaneously, the level that over-voltage detection circuit 400 detects can be also exported to level shifting circuit 600；Overvoltage detection electricity
The cathode of the zener diode Z1 on road connects the anode of load, when the voltage of load is more than the value of zener diode Z1, voltage stabilizing two
Pole pipe Z1 is connected, and exports high level to level shifting circuit 600；At this point, triode Q1 is connected, its collector can be to processing
Device 700 exports low level, then processor 700 is judged as circuit abnormality, then performs protection act；So as to fulfill to load circuit
Overvoltage detection and protection.The voltage value of overvoltage detection, voltage stabilizing can be set by the voltage stabilizing value for setting zener diode Z1
The value of diode Z1 is bigger, and overpressure value is higher.
Simultaneously, the level that short-circuit detecting circuit 500 detects can be also exported to level shifting circuit 600, short-circuit detecting electricity
The cathode of the third diode D3 on road 500 connects the anode of load, and the anode of third diode D3 connects the three of level shifting circuit 600
The collector of pole pipe Q1, if short circuit occurs for load, the cathode of third diode D3 is pulled to low level, while triode Q1
Collector is pulled to low level also by third diode D3, and can export low level to processor 700, then processor 700 is sentenced
Break as circuit abnormality, then perform protection act, so as to fulfill the detection and protection of the short circuit to load circuit.
The circuit checker of the embodiment of the present invention is using the electric current of the real-time observation circuit of discrete component, voltage and circuit
State, and testing result is exported to processor, corresponding protection act is made according to received state by processor.This
Invention can be carried out at the same time overcurrent, overvoltage and the detection of the circuit abnormality of short circuit, so as to fulfill multi-faceted protection；Due to using discrete
Element makes, and various parameters are easy to adjust, and accuracy of detection is high, and simple circuit, at low cost, and reliability is high.
The foregoing description of the disclosed embodiments enables professional and technical personnel in the field to realize or use the present invention.
A variety of modifications of these embodiments will be apparent for those skilled in the art, it is as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, it is of the invention
The embodiments shown herein is not intended to be limited to, and is to fit to and the principles and novel features disclosed herein phase one
The most wide range caused.
Claims (10)
1. a kind of circuit checker, which is characterized in that including overcurrent sample circuit, amplifying circuit, level comparison circuit, overvoltage
Detection circuit, short-circuit detecting circuit and level shifting circuit；The overcurrent sample circuit is used to acquire current sample, the amplification
For being amplified to the current sample acquired, the level comparison circuit is used for the amplified current sample circuit
Be compared with reference voltage, detection current sample whether overcurrent；The over-voltage detection circuit and short-circuit detecting circuit are used respectively
It is whether over-pressed or short-circuit in detection circuit；The level shifting circuit is used for according to the level comparison circuit, overvoltage detection electricity
The testing result of road or/and short-circuit detecting circuit exports corresponding level signal.
2. circuit checker according to claim 1, which is characterized in that further include processor, the processor is used for
According to the level signal decision circuitry that the level shifting circuit exports with the presence or absence of exception, if there is exception, then finger is sent out
It enables and performs protection act.
3. circuit checker according to claim 1 or 2, which is characterized in that the overcurrent sample circuit includes first
Resistance, the amplifying circuit include second resistance, described first resistor one end ground connection, the other end connect respectively the cathode of load with
And second resistance；The electric current of the load is flowed through from first resistor, and pressure drop is generated in first resistor, obtains the electricity of load current
Flow sample.
4. circuit checker according to claim 3, which is characterized in that the amplifying circuit further include 3rd resistor,
4th resistance and the first operational amplifier, the level comparison circuit further include the 5th resistance；One end of the second resistance point
Not Lian Jie first resistor and load cathode, the other end connects the 3rd foot of the first operational amplifier；One end of the 3rd resistor
Connect the 2nd foot and the 4th resistance of the first operational amplifier respectively, the other end connect respectively the first operational amplifier the 1st foot and
5th resistance；One end ground connection of 4th resistance, the other end connect the 2nd of 3rd resistor and the first operational amplifier respectively
Foot；The second resistance is used to the current sample being delivered to the first operational amplifier, and first operational amplifier is used for
Processing is amplified to the current sample, and is exported to the level comparison circuit.
5. circuit checker according to claim 4, which is characterized in that the level comparison circuit further includes the 6th electricity
Resistance, three terminal regulator and second operational amplifier, one end of the 5th resistance connect the 1st foot of the first operational amplifier respectively
And 3rd resistor, the other end connect the 6th foot of the second operational amplifier；One end connection power supply of 6th resistance, separately
One end connects the 2nd foot of three terminal regulator.
6. circuit checker according to claim 5, which is characterized in that the level comparison circuit further includes the 7th electricity
Resistance, the 8th resistance and capacitance, the level shifting circuit further include the first diode；One end connection electricity of 7th resistance
Source, the other end connect the 6th foot of the 3rd foot of the three terminal regulator, capacitance and second operational amplifier respectively；8th electricity
One end connection power supply of resistance, the other end connect the 7th foot of the second operational amplifier and the anode of the first diode respectively.
7. circuit checker according to claim 6, which is characterized in that the 1st foot ground connection of the three terminal regulator, the
2 feet connect the 6th resistance, and the 3rd foot connects the 6th foot of capacitance, the 7th resistance and second operational amplifier respectively；Second fortune
The 4th foot ground connection of amplifier is calculated, the 5th foot connects the 5th resistance, and the 6th foot connects capacitance, the 7th resistance and three terminal regulator respectively
The 3rd foot, the 7th foot connects the anode of the 8th resistance and the first diode respectively, and the 8th foot connects power supply；The three terminal regulator is used
In generating reference voltage, institute's second operational amplifier is used to the amplified current sample being compared with reference voltage,
If the amplified current sample voltage is higher than reference voltage, the second operational amplifier is to the level shifting circuit
Export high level；If the amplified current sample voltage is less than reference voltage, the second operational amplifier is to described
Level shifting circuit exports low level.
8. circuit checker according to claim 7, which is characterized in that the level shifting circuit further includes the 9th electricity
Resistance, the tenth resistance, the second diode and triode, the over-voltage detection circuit further include zener diode；9th resistance
One end connect the cathode of the first diode, the other end connects the base stage of the tenth resistance and triode respectively；Tenth electricity
One end of resistance connects the cathode of the second diode, and the other end connects the base stage of the 9th resistance and triode respectively；Described 1st
The anode of pole pipe connects the 8th resistance and the 7th foot of second operational amplifier respectively, and cathode connects the 9th resistance；Described 2nd 2
The anode of the anode connection zener diode of pole pipe, cathode connect the tenth resistance；The level of the second operational amplifier output
Triode is delivered to by the first diode and the 9th resistance, if what the triode received is high level, to described
Processor exports low level；If what the triode received is low level, high level is exported to the processor.
9. circuit checker according to claim 8, which is characterized in that described in the anode connection of the zener diode
The anode of second diode, the anode of cathode connection load；It is described when the voltage of load is more than the value of the zener diode
Zener diode exports high level, the triode ON to the level shifting circuit, and exports low electricity to the processor
It is flat.
10. circuit checker according to claim 9, which is characterized in that the short-circuit detecting circuit further includes third
Diode, the anode of the third diode connect the collector and processor of the triode respectively, cathode connection load
Anode；If short circuit occurs for load, the cathode of institute's third diode is pulled to low level, and the collector of the triode passes through institute
It states third diode and is pulled to low level, and low level is exported to the processor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611169544.6A CN108205100A (en) | 2016-12-16 | 2016-12-16 | A kind of circuit checker |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611169544.6A CN108205100A (en) | 2016-12-16 | 2016-12-16 | A kind of circuit checker |
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| CN108205100A true CN108205100A (en) | 2018-06-26 |
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| CN201611169544.6A Pending CN108205100A (en) | 2016-12-16 | 2016-12-16 | A kind of circuit checker |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109085414A (en) * | 2018-08-10 | 2018-12-25 | 深圳和而泰智能控制股份有限公司 | Voltage detection method and device |
| CN109525206A (en) * | 2018-12-28 | 2019-03-26 | 深圳中创艾宝技术有限公司 | A kind of radio-frequency power amplifier real-time monitoring protection circuit |
| CN110729698A (en) * | 2019-09-24 | 2020-01-24 | 珠海格力电器股份有限公司 | MCU overcurrent protection circuit and control method thereof |
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| CN109525206A (en) * | 2018-12-28 | 2019-03-26 | 深圳中创艾宝技术有限公司 | A kind of radio-frequency power amplifier real-time monitoring protection circuit |
| CN110729698A (en) * | 2019-09-24 | 2020-01-24 | 珠海格力电器股份有限公司 | MCU overcurrent protection circuit and control method thereof |
| CN111308391A (en) * | 2020-03-05 | 2020-06-19 | 南通大学 | Automobile wire harness conduction detection circuit |
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