CN108957210A - Electrolytic capacitor polarity detection circuit and detection device - Google Patents
Electrolytic capacitor polarity detection circuit and detection device Download PDFInfo
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- CN108957210A CN108957210A CN201810910340.6A CN201810910340A CN108957210A CN 108957210 A CN108957210 A CN 108957210A CN 201810910340 A CN201810910340 A CN 201810910340A CN 108957210 A CN108957210 A CN 108957210A
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- 239000003990 capacitor Substances 0.000 title claims abstract description 116
- 238000001514 detection method Methods 0.000 title claims abstract description 62
- 238000012360 testing method Methods 0.000 claims description 115
- 230000001681 protective effect Effects 0.000 claims description 24
- 230000005611 electricity Effects 0.000 claims description 18
- 239000000523 sample Substances 0.000 claims description 17
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/64—Testing of capacitors
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Abstract
The invention discloses an electrolytic capacitor polarity detection circuit, which comprises a power circuit, a detection circuit, a comparison circuit and a control indication circuit, wherein the detection circuit is used for accessing a capacitor to be detected; the power supply circuit comprises a first voltage division circuit; the detection circuit is coupled with the first voltage division circuit and is connected with the inverting input end of the comparison circuit so as to be compared with the preset voltage of the non-inverting input end of the comparison circuit, and the comparison circuit outputs a level signal; the control indicating circuit is connected with the output end of the comparison circuit, and the working state of the control indicating circuit is controlled by the level signal output by the comparison circuit. The invention also discloses an electrolytic capacitor polarity detection device applying the circuit. The method is applied to detecting whether the capacitor on the circuit board is reversely inserted or not, solves the problem of inaccurate detection, and has the advantages of accurate result, no damage to devices and the like.
Description
Technical field
The present invention relates to capacitance detecting field more particularly to electrolytic capacitor polarity detection circuit and check device fields.
Background technique
Electrolytic capacitor divides positive polarity and negative polarity, it is possible that polarity is anti-when electrolytic capacitor integrates on circuit boards
It inserts, the polarity anti-plug of electrolytic capacitor may cause circuit board reliability decrease and disabler.It is in detection electrolytic capacitor at present
Mainly or by artificial detection or by AO equipment compared and analyzed when no anti-plug, be in addition exactly using positive and negative anodes with outside
It leaks electricity between shell different detected.
A kind of online capacitor polarity tester is disclosed in Chinese invention patent CN202443090U.The patent is utilized just
Different principles of leaking electricity between cathode and shell, the electric signal of acquisition and testing capacitance are handled by single-chip microcontroller, are completed
Detection to positive anti-plug is carried out.
Although above-mentioned tester is able to detect capacitance detecting polarity, but detected using electric leakage is different, and probe is needed
It is contacted with shell, capacitance shell may be caused to damage, and it is difficult to ensure that well contact with shell, cause detection inaccurate.
The tester is only capable of testing capacitor, not can be carried out subsequent conditioning circuit functional test, and efficiency is lower.
Summary of the invention
The present invention is directed to above-mentioned electrolytic capacitor Check up polarity, proposes a kind of quasi- with testing result
Really, affected by environment small and can be applied to electrolytic capacitor polarity detection circuit and detection that FCT device is completely tested
Device.
To achieve the goals above, the present invention provides the following technical scheme that
A kind of electrolytic capacitor polarity detection circuit, it is characterised in that: including power circuit, for accessing the inspection of testing capacitance
Slowdown monitoring circuit, just inserting in testing capacitance, anti-plug when export the comparison circuit of varying level, and for loaded work piece in control circuit
State and indicative control instructions circuit；
Power circuit includes the first bleeder circuit；
Detection circuit is coupled with first bleeder circuit, and connects comparison circuit inverting input terminal, with comparison circuit
The preset voltage of non-inverting input terminal compares and outputs level signals；
Control instructions circuit is connected with the output end of comparison circuit, and the working condition of control instructions circuit is defeated by comparison circuit
Level signal control out.
Preferably, power circuit includes the first bleeder circuit, rectification circuit and filter circuit of pressure-stabilizing；
First bleeder circuit includes resistance R1 and resistance R2, and the first end of resistance R2 is connected with ground wire, and the second of resistance R2
End is connected with the first end of resistance R1；
Rectification circuit is the bridge type rectification circuit of four ports, and the both ends of alternating current steady voltage plug are connected to bridge type rectification circuit
The second input terminal of rectification circuit first input end and rectification circuit, wherein rectification circuit first input end and rectification circuit second
Input terminal is to be oppositely arranged, and the first output end of rectification circuit connects the first end of resistance R1, the connection of rectification circuit second output terminal
Ground wire；
Filter circuit of pressure-stabilizing includes voltage stabilizing chip N101 and filter capacitor C1, voltage stabilizing chip N101 input terminal and rectification circuit
First output end is connected, and voltage stabilizing chip N101 ground terminal is connected with ground wire, and voltage stabilizing chip N101 output end and filter capacitor C1 are just
Extremely it is connected, filter capacitor C1 cathode is connected with ground wire.
Preferably, comparison circuit includes the second bleeder circuit, voltage comparator chip N102, pull-up resistor R3 and first
Protective resistance R4；
Second bleeder circuit includes resistance R5 and resistance R6, and resistance R5 first end is connected with the first output end of rectification circuit,
Resistance R5 second end is connected with resistance R6 first end, and resistance R6 second end is connected with ground wire；
Voltage comparator chip N102 power end is connected with DC power supply, voltage comparator chip N102 ground terminal and ground wire
It is connected, voltage comparator chip N102 non-inverting input terminal is connected with resistance R5 second end, and voltage comparator chip N102 reverse phase is defeated
Entering end to be connected with detection circuit, the output end of voltage comparator chip N102 is connected with the first protective resistance R4 first end, and first
Protective resistance R4 second end is connected with control instructions circuit；
Pull-up resistor R3 first end is connected with power supply, pull-up resistor R3 second end and voltage comparator chip N102 output end
It is connected.
Preferably, detection circuit includes the first tooling testing needle, the second tooling testing needle and electrolytic capacitor CX to be measured；To
The both ends for surveying electrolytic capacitor CX are separately connected the first tooling testing needle end of probe and the second tooling testing needle end of probe；Second tooling
Testing needle connecting pin is connected with ground wire, the first tooling testing needle connecting pin and voltage comparator chip N102 reverse input end phase
Even.
Preferably, control instructions circuit includes control relay circuit and indicating circuit；Control relay circuit includes
The triode B1 of relay K1 and voltage comparator chip N102 control；Indicating circuit includes connecting with relay K1 electric signal
First switch S1 and second switch S2, indicating circuit further include the LED light V5 being connected with second switch S2.
Preferably, control relay circuit further includes power supply and the second protective resistance R8, relay K1 first end and electricity
Source connection, relay K1 second end are connect with the second protective resistance R8 first end, the second end of the second protective resistance R8 and three poles
The collector of pipe B1 is connected, and the emitter of triode B1 is connected with ground wire；The base stage of triode B1 through the first protective resistance R4 with
Voltage comparator chip N102 is connected；
The both ends first switch S1 are separately connected the second end of the first tooling testing needle connecting pin and resistance R2, second switch S2
Both ends are separately connected LED light V5 and power supply, and the LED light V5 other end is connected with ground wire；First switch S1 and second is opened
Close S2 setting are as follows: first switch S1 and second switch S2 is disconnected when relay K1 is attracted, and first opens in relay K1 release
Close S1 and second switch S2 closure.
Preferably, control relay circuit further includes protection diode V6, the cathode and relay of protection diode V6
K1 first end is connected, and the anode of protection diode V6 is connected with relay K1 second end.
A kind of electrolytic capacitor device for detecting polarity, it is characterised in that: above-mentioned electrolytic capacitor polarity detection circuit further includes
FCT testing jig and it is arranged on FCT testing jig that the testing jig of circuit board under test buckles, FCT testing jig power supply opens to limit
Pass, attaching plug, third tooling testing needle and the 4th tooling testing needle.
Preferably, the first tooling testing needle and the second tooling testing needle are electric with the electrolysis to be measured on circuit board under test respectively
Hold the both ends CX to be connected, third tooling testing needle and the 4th tooling testing needle are connected with circuit under test feeder ear.
Preferably, the third switch S3 is connected with relay K1 electric signal, the both ends third switch S3 are surveyed with FCT respectively
Examination frame is connected with firewire；Third switch S3 is set as third switch S3 when relay K1 is attracted and is closed, the when relay K1 release
Three switch S3 are disconnected.
The invention has the benefit that the present invention is coupled using testing capacitance with current rectifying and wave filtering circuit, the voltage of output
It is compared with preset voltage, completes the test to testing capacitance；It is affected by environment smaller when the present invention tests electrolytic capacitor.
The pin at capacitor both ends is accessed circuit by probe by the present invention, and contacts the tester phase tested with shell using probe
Than, this invention ensures that good contact, and do not damage capacitor.Present invention can also apply to FCT devices, carry out complete electricity
The test of road plate, has the advantages that efficient.
Detailed description of the invention
Fig. 1 is the schematic diagram of electrolytic capacitor polarity detection circuit provided by the invention；
Fig. 2 is the circuit diagram of electrolytic capacitor device for detecting polarity provided by the invention；
Fig. 3 is the tooling schematic diagram of electrolytic capacitor device for detecting polarity provided by the invention.
Wherein: 1, power circuit；2, comparison circuit；3, detection circuit；4, control instructions circuit；31, the first tooling is tested
Needle；32, the second tooling testing needle；51, FCT testing jig；52, testing jig buckles；53, circuit board under test；54, FCT testing jig electricity
Source switch；55, attaching plug；56, third tooling testing needle；57, the 4th tooling testing needle.
Specific embodiment
Hereinafter, a specific embodiment of the invention is further described in conjunction with attached drawing.
The present invention provides a kind of electrolytic capacitor polarity detection circuit and check devices, can be used for electrolytic capacitor Check up polarity
Field.Present invention utilizes alternating currents, and its size is original 1.2-1.4 times after family's electrolysis capacitor filtering after diode rectification
Principle, have many advantages, such as result it is accurate, it is affected by environment it is smaller, do not damage component.
Electrolytic capacitor polarity detection circuit provided by the invention is as shown in Figure 1, mainly include power circuit 1, comparison circuit
2, detection circuit 3 and control instructions circuit 4.
Present invention utilizes alternating currents be powered on after diode rectification solution capacitor filtering after its size be original 1.2-1.4 times
Principle, corresponding power circuit 1 include alternating current steady voltage plug, diode constitute rectification circuit, be electrolytic capacitor CX to be measured
Distribute the bleeder circuit and filter circuit of pressure-stabilizing of reasonable voltage.
Wherein there are four the bridge type rectified currents of connectivity port using the tool that four diode annulars connect and compose for rectification circuit
Road, as shown in Fig. 1 power circuit part, two of them diode, the positive port with positive connecting place is rectification circuit first
Output end；The port of other two opposite diode of position, cathode and cathode connecting place is rectification circuit second output terminal；Bridge
Other two port of type rectification circuit is respectively the second input terminal of rectification circuit first input end and finishing circuit.AC voltage-stabilizing
The both ends of circuit connect the second input terminal of rectification circuit first input end and rectification circuit in bridge type rectification circuit respectively, make bridge type
The first output end of rectification circuit and rectification circuit second output terminal of rectification circuit export Full wave shape DC voltage.Above-mentioned rectified current
The first output end of road is connected with other loads, is other load supplyings；Rectification circuit second output terminal is connected with ground wire.
As shown in figure 1 shown in power circuit part, the first bleeder circuit is made of resistance R1 and resistance R2, rectification circuit first
Output end is connected with resistance R1 second end, and resistance R1 first end is connected with resistance R2 second end, resistance R2 first end and ground wire phase
Even, resistance R1 and resistance R2 is series relationship, and the resistance value of the two can be set according to specific partial pressure.In the present embodiment,
The voltage that alternating current steady voltage plug is arranged is 12V, and the partial pressure on resistance R2 is set as 5V, then correspondingly setting resistance R1 resistance value is
4.7K Ω, resistance R2 resistance value are 3.3K Ω, and the partial pressure on corresponding resistance R2 is 12 X, 3.3/ (4.7+3.3) ≈ 5V.Exchange is steady
The voltage of voltage source may be set to be other values, such as 9V or 36V；Partial pressure on resistance R2 may be set to be other
Less than the voltage value of regulated power supply, such as when regulated power supply is 9V, the partial pressure on resistance R2 can be set to 3V, also can be set
For 6V；According to the partial pressure on regulated power supply voltage and resistance R2, resistance R1 and resistance R2 resistance value are configured accordingly.
Any one resistance being previously mentioned in the application, if resistance is horizontally disposed in circuit diagram, from left to right successively
For the first end of resistance and the second end of resistance；If resistance in circuit diagram perpendicular to horizontally arranged, from top to bottom
It is followed successively by the first end of resistance and the second end of resistance.
Power circuit part as shown in Figure 1, filter circuit of pressure-stabilizing part is by voltage stabilizing chip N101 and filter capacitor C1 group
At using 7812 three-terminal regulator chips, three of them port is respectively input terminal, connects the voltage stabilizing chip N101 in the present embodiment
Ground terminal and output end.Voltage stabilizing chip N101 interface 1 is input terminal in Fig. 1, and interface 2 is ground terminal, and interface 3 is output end.
The input terminal of 7812 three-terminal regulator chips is connected with the first output end of rectification circuit, voltage stabilizing chip N101 output termination filter capacitor
The anode of C1；Voltage stabilizing chip N101 ground terminal is connected with ground wire, and the cathode of filter capacitor C1 is connected with ground wire；By voltage regulation filtering
After obtain 12V DC electricity.Filter circuit of pressure-stabilizing is connect in parallel in a power with the first bleeder circuit.
As shown in Figure 1, comparison circuit 2 is by voltage comparator chip N102, pull-up resistor R3, the first protective resistance R4, electricity
R5 and resistance R6 is hindered to constitute.The first end of resistance R5 is connected with voltage stabilizing chip N101 output end, the second end and resistance of resistance R5
The first end of R6 is connected, and the second end of resistance R6 is connected with ground wire；Resistance R5 and resistance R6 is composed in series the second bleeder circuit, the
Two bleeder circuits are connected between voltage stabilizing chip N101 output end and ground wire；Resistance R5 is connected with voltage stabilizing chip N101 output end,
Resistance R6 is connected with ground wire.Resistance R5 resistance value is 5K Ω in the present embodiment, and resistance R6 resistance value is 4.2K Ω, and the partial pressure of resistance R6 is
12ⅹ4.2/(5+4.2)≈5.5V.Resistance R5, resistance R6 resistance value be also configurable to other numerical value so that on resistance R6
Partial pressure be greater than on resistance R2 and divide, but be less than on resistance R2 divide 1.2 times.Such as it is arranged in other one embodiment
When regulated power supply is 9V, the partial pressure on resistance R2 can be set to 6V, can set resistance R5 resistance value to 6K Ω, resistance R6 resistance
Value is set as 2.3K Ω, and the partial pressure on resistance R6 is 9 X, 6/ (6+2.3) ≈ 6.5V
Voltage comparator chip N102 in the present embodiment uses LM393 voltage comparator chip, as shown in figure 1 comparison circuit
Shown in part, 1 foot, 2 feet, 3 feet, 4 feet and 8 feet of voltage comparator chip N102, respectively output end, reversed input are chosen
End, non-inverting input terminal, ground terminal and power end.Voltage comparator chip N102 ground terminal is connected with ground wire, power end and power supply
The output end of voltage-stablizer is connected in circuit, provides the direct-current working volts of 12V for voltage comparator chip N102.The of resistance R5
Two ends are connected with voltage comparator chip N102 non-inverting input terminal, then voltage comparator chip N102 non-inverting input terminal voltage is R6
On partial pressure, be 5.5V.When voltage comparator chip N102 reverse input end voltage is greater than non-inverting input terminal voltage, voltage ratio
High level is exported compared with device chip N102 output end；When voltage comparator chip N102 reverse input end voltage is less than non-inverting input terminal
When voltage, voltage comparator chip N102 output end exports low level.Voltage comparator chip N102 output end and the first protection
Resistance R4 first end is connected, and the first protective resistance R4 second end is connected with control instructions circuit.In addition, voltage comparator chip
N102 normal work must be provided with pull-up resistor.The both ends pull-up resistor R3 be separately connected voltage comparator chip N102 power section and
Output end, resistance R3 is pulled up in the present embodiment as voltage comparator chip N102 pull-up resistor in comparison circuit part
Resistance R3 resistance value is set as 1K Ω, and the first protective resistance R4 resistance value is 1K Ω.Pull-up resistor R3 resistance value is also configurable to 1.5K
Ω 2K Ω or other resistance values；First protective resistance R4 resistance value be also configurable to 1.2K Ω or 2.1K Ω or its
His resistance value.
As shown in Fig. 1 detection circuit part, detection circuit 3 is by the first tooling testing needle 31,32 and of the second tooling testing needle
Electrolytic capacitor CX composition to be measured.First tooling testing needle 31 is used to connect electrolytic capacitor CX to be measured with the second tooling testing needle 32
Into circuit；First tooling testing needle, 31 end of probe is connected with the one end electrolytic capacitor CX to be measured, and the first tooling testing needle 31 connects
Line end ground connection；Second tooling testing needle, 32 end of probe is connected with the other end of electrolytic capacitor CX to be measured, the second tooling testing needle 32
Terminals the second end of resistance R2 is connected to by second switch S2；Electrolytic capacitor CX and resistance R2 to be measured are simultaneously in circuit
Connection relationship.The terminals of second tooling testing needle 32 are also connected with the reverse input end of voltage comparator chip N102, and second opens
When closing S2 closure, the voltage in the second end of resistance R2 is electric by the input as voltage comparator chip N102 reverse input end
Pressure.
When electrolytic capacitor CX to be measured just connects, that be connected with 31 end of probe of the first tooling testing needle is electrolytic capacitor CX to be measured
Cathode, what is be connected with 32 end of probe of the second tooling testing needle is the anode of electrolytic capacitor CX to be measured.The electrolysis to be measured electricity just connect
It is in parallel with resistance R2 to hold CX, under the action of electrolytic capacitor, the partial pressure on resistance R2 will improve 1.2-1.4 times, in the model of 6V-7V
In enclosing；Corresponding voltage comparator chip N102 reverse input end voltage is greater than non-inverting input terminal voltage in the range of 6V-7V
5.5V, voltage comparator chip N102 output end export high level.When electrolytic capacitor CX to be measured reversal connection, surveyed with the first tooling
What 31 end of probe of test point was connected is the anode of electrolytic capacitor CX to be measured, and what is be connected with 32 end of probe of the second tooling testing needle is to be measured
The cathode of electrolytic capacitor CX.The electrolytic capacitor CX to be measured of reversal connection is in parallel with resistance R2, and the partial pressure on resistance R2 is still maintained at 5V；
Corresponding voltage comparator chip N102 reverse input end voltage is 5V, and less than the 5.5V of non-inverting input terminal voltage, voltage compares
Device chip N102 output end exports low level.
The function of control instructions circuit be mainly loaded come control section by the actuation of relay K1 and release energization/
Power loss situation, just slotting/anti-plug situation of instruction testing capacitance.Control instructions circuit is by control relay circuit and indicating circuit two
Part forms.
Control relay circuit includes power supply, relay K1, the second protective resistance R8, triode B1 and protection diode
V6.DC power supply, relay K1, the second protective resistance R8 and triode B1 are sequentially connected in series；The cathode of protection diode V6 with after
Junction between electric appliance K1, power supply is connected, the junction between the anode of protection diode V6 and relay K1, triode B1
It is connected, both ends are connected to the both ends of relay K1, and protection diode V6 is in parallel with relay K1.Relay K1 obtains electric actuation
When protection diode V6 be off state, relay K1 power loss discharge when protection diode V6 be on state, protection diode
V6 is used to that relay K1 is prevented to be attracted to puncture with electromotive force during release.The specific connection type of above-mentioned triode B1 is as follows,
The collector of triode B1 is connected with the second protective resistance R8, and the emitter of triode B1 does grounding (emitter and ground wire
It is connected), the base stage of triode B1 is connected with the first protective resistance R4 first end, and the first protective resistance R4 second end is compared with voltage
Device chip N102 voltage comparator chip N102 output end is connected.First protective resistance R4 is played in circuit as protective resistance
The effect of electric current is limited, voltage comparator chip N102 voltage comparator chip N102 output end voltage controls triode B1's
On-off；When voltage comparator chip N102 output end exports high level, it is between triode B1 collector and emitter
State, control relay circuit conducting, relay K1 obtain electric and in actuation state；Voltage comparator chip N102 output end
When exporting low level, off state is between the collector and emitter of triode B1, control relay circuit is not turned on, after
Electric appliance K1 power loss and in release state.
First switch S1 and second switch S2 that indicating circuit is regulated and controled by relay K1 is controlled.First switch S1 and
Two switch S2 are normally closed switch；In relay K1 release, first switch S1 and second switch S2 closure；Relay K1 is attracted
When, first switch S1 and second switch S2 are disconnected.In the present embodiment, the both ends of first switch S1 are separately connected the first tooling electricity
The terminals on road and the second end of resistance R2, control electrolytic capacitor CX to be measured obtains electric or power loss；When relay K1 is attracted, the
One switch S1 is disconnected, electrolytic capacitor CX power loss to be measured；When relay K1 release, second switch S2 closure, electrolytic capacitor to be measured
CX obtains electric.Indicating circuit passes through the control of second switch S2, and 12V DC power supply, resistance R7, (LED refers to Light-Emitting Diode indicator light
Showing lamp) V5 and ground wire be sequentially connected in series；Wherein the cathode of LED light V5 is connect with ground wire, and anode is connected with the 7th resistance.When after
When electric appliance K1 is attracted, second switch S2 is disconnected, indicating circuit power loss, and LED light V5 extinguishes；When relay K1 release, the
Two switch S2 closure, indicating circuit obtains electric, and LED light V5 is lighted.
Electrolytic capacitor CX to be measured is not accessed, and electrolytic capacitor polarity detection circuit no power is equivalent to electricity all in circuit
Source voltage is 0；Relay K1 power loss discharges at this time, and first switch S1 and second switch S2 are all in closed state.Access to
It after surveying electrolytic capacitor CX, is powered to electrolytic capacitor polarity detection circuit, there are two types of states for electrolytic capacitor polarity checking circuit: to be measured
Electrolytic capacitor CX just connects, electrolytic capacitor CX to be measured is reversely connected.
When electrolytic capacitor CX to be measured just connects, that be connected with 31 end of probe of the first tooling testing needle is electrolytic capacitor CX to be measured
Cathode, what is be connected with 32 end of probe of the second tooling testing needle is the anode of electrolytic capacitor CX to be measured.The electrolysis to be measured electricity just connect
It is in parallel with resistance R2 to hold CX, under the action of electrolytic capacitor, the voltage of the second end of resistance R2 will be improved, so that voltage comparator
Chip N102 reverse input end voltage is greater than non-inverting input terminal voltage, and voltage comparator chip N102 output end exports high level.
Voltage comparator chip N102 output end exports high level, so that being on shape between triode B1 collector and emitter
State, control relay circuit conducting, relay K1 obtain electric and in actuation state.When relay K1 is attracted, first switch
S1 and second switch S2 are disconnected, electrolytic capacitor CX power loss to be measured, and indicating circuit power loss LED light V5 extinguishes.Circuit is broken
Electricity, detection terminate.
When electrolytic capacitor CX to be measured reversal connection, that be connected with 31 end of probe of the first tooling testing needle is electrolytic capacitor CX to be measured
Anode, what is be connected with 32 end of probe of the second tooling testing needle is the cathode of electrolytic capacitor CX to be measured.The electrolysis to be measured electricity of reversal connection
Appearance CX is in parallel with resistance R2, and the voltage of the second end of resistance R2 is constant at this time, so that voltage comparator chip N102 is reversely inputted
Voltage is held to be less than non-inverting input terminal voltage, voltage comparator chip N102 output end exports low level.Voltage comparator chip
N102 output end exports low level, so that off state is between triode B1 collector and emitter, relay control electricity
Road disconnect, relay K1 power loss and in release state.In relay K1 release, first switch S1, second switch S2 are equal
Closure, electrolytic capacitor CX power loss to be measured, indicating circuit obtain electric, and LED light V5 is lighted.By down circuitry, detection terminates.
To sum up, when electrolytic capacitor is reversely connected, the LED light V5 of electrolytic capacitor polarity detection circuit is lighted；Electrolytic capacitor is just
When connecing, the LED light V5 of electrolytic capacitor polarity detection circuit extinguishes.
The present invention also provides a kind of electrolytic capacitor device for detecting polarity, below with reference to Fig. 2 and Fig. 3 to specific embodiment into
Row description.
Electrolytic capacitor device for detecting polarity of the invention uses above-mentioned electrolytic capacitor polarity detection circuit, and adds
The components such as FCT testing jig 51, FCT testing jig power switch 55 and attaching plug 55, form a set of FCT test device, circuit
Schematic diagram is as shown in Figure 2.Compared to electrolytic capacitor polarity detection circuit, electrolytic capacitor device for detecting polarity is in control instructions circuit
Third switch S3 is added in part, and the both ends third switch S3 are connected with firewire, FCT testing jig 51 respectively；Third switch S3 and first
Acknowledging relay K1 is controlled together by switch S1, second switch S2.When relay K1 obtains electric actuation, third switch S3 closure, FCT is surveyed
The electric test for carrying out next step is set to obtain in trial assembly；When relay K1 power loss discharges, third switch S3 is disconnected, FCT test device power loss,
Detection terminates.
As shown in figure 3, FCT testing jig power switch 55, attaching plug 55, electrolytic capacitor polarity detection circuit, the first work
Fill testing needle 31, the second tooling testing needle 32, third tooling testing needle 56, the 4th tooling testing needle 57 and testing jig buckle 52
It is arranged on FCT testing jig 51, forms FCT test device.Attaching plug 55 and the setting of 51 power supply of FCT testing jig are tested in FCT
On frame 51, power supply is provided for FCT test device；Circuit board under test 53 to be detected is fixed on FCT test by testing jig buckle 52
On frame 51, and circuit board under test 53 is limited, facilitates testing needle to position electrolytic capacitor CX to be measured, by electrolytic capacitor
Access circuit 3；First tooling testing needle 31 and the effect of the second tooling testing needle 32 are that electrolytic capacitor CX to be measured is connected to electrolysis
In capacitor polarity detection circuit, test electrolytic capacitor whether anti-plug；Electrolytic capacitor device for detecting polarity is tested by third tooling
Needle 56 and the 4th tooling testing needle 57 are circuit board power supply, carry out next step test.
It is as follows that electrolytic capacitor device for detecting polarity carries out detection process to electrolytic capacitor in circuit board under test 53:
Attaching plug 55 is connected into power supply first, buckles 52 pairs of circuit board under test 53 by testing jig and is fixed and limits,
Guarantee that the electrolytic capacitor of circuit board under test 53 is formed and well contacted with the first tooling testing needle 31 and the second tooling testing needle 32, to
The supply port of slowdown monitoring circuit plate 53 forms good contact with third tooling testing needle 56, the 4th tooling testing needle 57.Next,
It is closed FCT testing jig power switch 55, is powered for electrolytic capacitor device for detecting polarity, corresponding electrolytic capacitor CX to be measured passes through the
One tooling testing needle 31 and the second tooling testing needle 32 access electrolytic capacitor detection circuit, carry out electrolytic capacitor Check up polarity.
When electrolytic capacitor CX anti-plug to be measured, electrolytic capacitor polarity detection circuit controls relay K1 release；Accordingly, third
Switch S3 is disconnected, and without the detection of next step, while first switch S1 and second switch S2 closure, LED light V5 are lighted,
Prompt electrolytic capacitor error-polarity connection.When electrolytic capacitor CX to be measured is just inserted, electrolytic capacitor polarity detection circuit controls relay K1 and inhales
It closes；Correspondingly, third switch S3 is closed, the detection of next step is carried out, while first switch S1 and second switch S2 is disconnected, LED
Indicator light V5 extinguishes.
To sum up, the electrolytic capacitor polarity detection circuit and detection device that the present invention designs, can complete be to electrolytic capacitor
No anti-plug is detected, and can be indicated by LED light V5 when anti-plug, and circuit board caused by polarity anti-plug is avoided
Reliability decrease, disabler.
The above described is only a preferred embodiment of the present invention, being not that the invention has other forms of limitations, appoint
What those skilled in the art changed or be modified as possibly also with the technology contents of the disclosure above equivalent variations etc.
It imitates embodiment and is applied to other fields, but without departing from the technical solutions of the present invention, according to the technical essence of the invention
Any simple modification, equivalent variations and remodeling to the above embodiments, still fall within the protection scope of technical solution of the present invention.
Claims (10)
1. a kind of electrolytic capacitor polarity detection circuit, it is characterised in that: including power circuit, for accessing the detection of testing capacitance
Circuit, just inserting in testing capacitance, anti-plug when export the comparison circuit of varying level, and for loaded work piece shape in control circuit
State and indicative control instructions circuit；
Power circuit includes the first bleeder circuit；
Detection circuit is coupled with first bleeder circuit, and connects comparison circuit inverting input terminal, with the same phase of comparison circuit
The preset voltage of input terminal compares and outputs level signals；
Control instructions circuit is connected with the output end of comparison circuit, what the working condition of control instructions circuit was exported by comparison circuit
Level signal control.
2. electrolytic capacitor polarity detection circuit as described in claim 1, it is characterised in that: power circuit includes the first partial pressure electricity
Road, rectification circuit and filter circuit of pressure-stabilizing；
First bleeder circuit includes resistance R1 and resistance R2, and the first end of resistance R2 is connected with ground wire, the second end of resistance R2 with
The first end of resistance R1 is connected；
Rectification circuit is the bridge type rectification circuit of four ports, and the both ends of alternating current steady voltage plug are connected to the rectification of bridge type rectification circuit
The second input terminal of circuit first input end and rectification circuit, wherein rectification circuit first input end and rectification circuit second input
End is is oppositely arranged, and the first output end of rectification circuit connects the first end of resistance R1, rectification circuit second output terminal connects ground wire；
Filter circuit of pressure-stabilizing includes voltage stabilizing chip N101 and filter capacitor C1, voltage stabilizing chip N101 input terminal and rectification circuit first
Output end is connected, and voltage stabilizing chip N101 ground terminal is connected with ground wire, voltage stabilizing chip N101 output end and filter capacitor C1 anode phase
Even, filter capacitor C1 cathode is connected with ground wire.
3. electrolytic capacitor polarity detection circuit as described in claim 1, it is characterised in that: comparison circuit includes the second partial pressure electricity
Road, voltage comparator chip N102, pull-up resistor R3 and the first protective resistance R4；
Second bleeder circuit includes resistance R5 and resistance R6, and resistance R5 first end is connected with the first output end of rectification circuit, resistance
R5 second end is connected with resistance R6 first end, and resistance R6 second end is connected with ground wire；
Voltage comparator chip N102 power end is connected with DC power supply, voltage comparator chip N102 ground terminal and ground wire phase
Even, voltage comparator chip N102 non-inverting input terminal is connected with resistance R5 second end, voltage comparator chip N102 anti-phase input
End is connected with detection circuit, and the output end of voltage comparator chip N102 is connected with the first protective resistance R4 first end, and first protects
Shield resistance R4 second end is connected with control instructions circuit；
Pull-up resistor R3 first end is connected with power supply, pull-up resistor R3 second end and voltage comparator chip N102 output end phase
Even.
4. electrolytic capacitor polarity detection circuit as described in claim 1, it is characterised in that: detection circuit is surveyed including the first tooling
Test point, the second tooling testing needle and electrolytic capacitor CX to be measured；The both ends of electrolytic capacitor CX to be measured are separately connected the test of the first tooling
Needle end of probe and the second tooling testing needle end of probe；Second tooling testing needle connecting pin is connected with ground wire, the first tooling testing needle
Connecting pin is connected with voltage comparator chip N102 reverse input end.
5. electrolytic capacitor polarity detection circuit as described in claim 1, it is characterised in that: control instructions circuit includes relay
Control circuit and indicating circuit；Control relay circuit includes the triode of relay K1 and voltage comparator chip N102 control
B1；Indicating circuit includes the first switch S1 and second switch S2 connecting with relay K1 electric signal, indicating circuit further include with
Second switch S2 connected LED light V5.
6. electrolytic capacitor polarity detection circuit as claimed in claim 5, it is characterised in that: control relay circuit further includes electricity
Source and the second protective resistance R8, relay K1 first end connect to power supply, relay K1 second end and the second protective resistance R8 the
One end connection, the second end of the second protective resistance R8 are connected with the collector of triode B1, the emitter and ground wire of triode B1
It is connected；The base stage of triode B1 is connected through the first protective resistance R4 with voltage comparator chip N102；
The both ends first switch S1 are separately connected the second end of the first tooling testing needle connecting pin and resistance R2, the both ends second switch S2
It is separately connected LED light V5 and power supply, the LED light V5 other end is connected with ground wire；First switch S1 and second switch S2
Setting are as follows: first switch S1 and second switch S2 is disconnected when relay K1 is attracted, the first switch S1 in relay K1 release
It is closed with second switch S2.
7. electrolytic capacitor polarity detection circuit as claimed in claim 5, it is characterised in that: control relay circuit further includes protecting
Diode V6 is protected, the cathode of protection diode V6 is connected with relay K1 first end, the anode and relay of protection diode V6
K1 second end is connected.
8. a kind of electrolytic capacitor device for detecting polarity, it is characterised in that: including electrolysis electricity of any of claims 1-7
Hold polarity detection circuit, further includes FCT testing jig and the testing jig on FCT testing jig to limit circuit board under test is set
Buckle, FCT testing jig power switch, attaching plug, third tooling testing needle and the 4th tooling testing needle.
9. electrolytic capacitor polarity detection circuit as claimed in claim 8, it is characterised in that: the first tooling testing needle and the second work
Dress testing needle is connected with the both ends electrolytic capacitor CX to be measured on circuit board under test respectively, and third tooling testing needle and the 4th tooling are surveyed
Test point is connected with circuit under test feeder ear.
10. electrolytic capacitor polarity detection circuit as claimed in claim 8, it is characterised in that: the third switch S3 and relay
Device K1 electric signal is connected, and the both ends third switch S3 are connected with FCT testing jig and firewire respectively；Third switch S3 is set as relay
Third switch S3 is closed when K1 is attracted, and third switch S3 is disconnected when relay K1 discharges.
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| CN201810910340.6A CN108957210B (en) | 2018-08-10 | 2018-08-10 | Electrolytic capacitor polarity detection circuit and detection device |
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|---|---|---|---|
| CN201810910340.6A CN108957210B (en) | 2018-08-10 | 2018-08-10 | Electrolytic capacitor polarity detection circuit and detection device |
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Cited By (5)
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| CN110988752A (en) * | 2019-12-27 | 2020-04-10 | 常州同惠电子股份有限公司 | Capacitance polarity testing method for wire tester |
| CN113296030A (en) * | 2021-05-28 | 2021-08-24 | 南通华裕电子有限公司 | Electrolytic capacitor polarity detection circuit and detection device |
| CN113589200A (en) * | 2021-07-30 | 2021-11-02 | 宁波三星医疗电气股份有限公司 | Supercapacitor connection fault detection method and system |
| CN117761514A (en) * | 2023-12-29 | 2024-03-26 | 扬州江新电子有限公司 | High-voltage packaging polarity test circuit and test method thereof |
| WO2024108514A1 (en) * | 2022-11-24 | 2024-05-30 | 惠州视维新技术有限公司 | Protection circuit, display device, and detection method |
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| CN113589200B (en) * | 2021-07-30 | 2023-12-01 | 宁波三星医疗电气股份有限公司 | Super capacitor connection fault detection method and system |
| WO2024108514A1 (en) * | 2022-11-24 | 2024-05-30 | 惠州视维新技术有限公司 | Protection circuit, display device, and detection method |
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| CN117761514B (en) * | 2023-12-29 | 2024-05-31 | 扬州江新电子有限公司 | High-voltage packaging polarity test circuit and test method thereof |
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