CN209296877U - A kind of circuit board automated test device - Google Patents
A kind of circuit board automated test device Download PDFInfo
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- CN209296877U CN209296877U CN201822165764.2U CN201822165764U CN209296877U CN 209296877 U CN209296877 U CN 209296877U CN 201822165764 U CN201822165764 U CN 201822165764U CN 209296877 U CN209296877 U CN 209296877U
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Abstract
The embodiment of the present application discloses a kind of circuit board automated test device, which includes: communication interface, main circuit board and the detection needle for connecting circuit board under test；Communication interface is connected with main circuit board, for receiving test control signal from test host computer, and test control signal is transferred to main circuit board；Main circuit board includes linear rectification circuit, analog to digital conversion circuit, governor circuit and power circuit；Linear rectification circuit is connected with detection needle, and linear rectification circuit is also connected with analog to digital conversion circuit, and analog to digital conversion circuit is also connected with governor circuit；Governor circuit is used to send test instruction to circuit board under test by detection needle according to test control signal, and the testing result for corresponding to test instruction is obtained according to the feedback of linear rectification circuit and analog to digital conversion circuit；Governor circuit will test result and send PC by communication interface to judge testing result.The accurate and comprehensive test to circuit board may be implemented in the circuit board automated test device.
Description
Technical field
The invention relates to testing field more particularly to a kind of circuit board automated test devices.
Background technique
In the production process of household electrical appliance, in order to guarantee final product quality, require to carry out quality test, especially
It is to be related to the circuit board of household electrical appliance function realization, it is main using artificial at present in the circuit board testing field of household electrical appliance
Mode carries out functional test to circuit board, and manually-operated content main someone's craft dial-up, manually checks correspondence at remote manual control
Test lamp and display and decision circuitry plate it is whether working properly, inevitably will appear in this way test error or function point leakage
It surveys.
Utility model content
This application provides a kind of circuit board automated test device, may be implemented to the accurate of the circuit of household electrical appliance and
Test comprehensively.
In a first aspect, providing a kind of circuit board automated test device, comprising: communication interface, main circuit board and for connecting
Connect the detection needle of circuit board under test；
The communication interface is connected with the main circuit board, for receiving test control signal from test host computer, and will
The test control signal is transferred to the main circuit board；
The main circuit board includes linear rectification circuit, analog to digital conversion circuit, governor circuit and power circuit；It is described linear
Rectification circuit is connected with the detection needle, and the linear rectification circuit is also connected with analog-digital conversion circuit as described, and the modulus turns
Circuit is changed also to be connected with the governor circuit；The governor circuit is used to pass through the detection needle according to the test control signal
Test instruction is sent to the circuit board under test, and is obtained pair according to the feedback of the linear rectification circuit and analog to digital conversion circuit
The testing result of instruction is tested described in Ying Yu；
The governor circuit is also used to that the testing result is sent PC to judge the detection by the communication interface
As a result.
Wherein, the linear rectification circuit include first resistor, second resistance, transformer, 3rd resistor, the 4th resistance,
5th resistance, the operational amplifier of model LM358, the second diode, third diode, the 6th resistance, the 7th resistance, the 8th
Resistance, the 9th resistance, the tenth resistance, eleventh resistor, twelfth resistor, the 9th capacitor, the first variable resistance and second are variable
Resistance；
The first end of the first resistor is connected with firewire inlet wire, the second end of the first resistor and the transformer
First input end is connected；The first end of the second resistance is connected with zero curve inlet wire, the second end of the second resistance with it is described
Second input terminal of transformer is connected；The first end of first output end of the transformer and the 3rd resistor, the described 4th
The first end of resistance and the first end of the 8th resistance are connected；The second end of 4th resistance and the operational amplifier
Pin 6, second diode cathode and the 6th resistance first end be connected, the first end of the 5th resistance
It is connected with the pin 5 of the operational amplifier；The anode and institute of the pin 7 of the operational amplifier and second diode
The cathode for stating third diode is connected；The second end and the described 7th of the anode of the third diode and the 6th resistance
The first end of resistance is connected；The second end of 7th resistance, the second end of the 8th resistance, the operational amplifier draw
Foot 2, the pin 4 of the operational amplifier, the first end of the twelfth resistor, the first end of the 9th capacitor access-
5V；The second end of the twelfth resistor, the second end of the 9th capacitor, the operational amplifier pin 1 with it is described
First fixing terminal of the second adjustable resistance is connected；The movable terminal of the second adjustable resistance accesses power supply；The fortune
The pin 3 for calculating amplifier is connected with the first end of the eleventh resistor；The second end of the eleventh resistor and the described tenth
The first end of resistance and the first end of the 9th resistance are connected；The second end and described first of 9th resistance can power transformation
The movable terminal of resistance is connected, the first fixing terminal access -5V of first variable resistance, and the second of first variable resistance
The pin 8 of fixing terminal and the operational amplifier is connected with analog-digital conversion circuit as described；The second of the transformer is defeated
Outlet, the second end of the 3rd resistor, the second end of the 5th resistance, the second end of the tenth resistance and described
Second fixing terminal of two variable resistances is grounded.
Wherein, analog-digital conversion circuit as described includes the first chip, thirteenth resistor, the 14th electricity of model ICL7107
Resistance, the 15th resistance, the 16th resistance, the 17th resistance, the tenth capacitor, the 11st capacitor, the 12nd capacitor, the 13rd electricity
Appearance, the 14th capacitor and the 19th capacitor；
The first of the pin 31 and the 11st capacitor of the first end of the thirteenth resistor and first chip
End is connected, and the second end of the thirteenth resistor exports power supply；The first end and the described 15th of 14th resistance
The pin 35 of the first end of resistance and first chip is connected, the second end of the 15th resistance and first chip
Pin 32 and pin 35 be connected；The first end of the second end of 14th resistance and the 19th capacitor, described the
Second fixing terminal of one variable resistance and the pin 8 of the operational amplifier are connected；The first end of 16th resistance
It is connected with the pin 39 of first chip, the second end of the 16th resistance and the pin 40 of first chip and institute
The first end for stating the tenth capacitor is connected, and the second end of the tenth capacitor is connected with the pin 38 of first chip；Described
The first end of 17 resistance is connected with the pin 28 of first chip, the second end and the described 12nd of the 17th resistance
The first end of capacitor and the first end of the 13rd capacitor are connected；The second end of 12nd capacitor and first core
The pin 29 of piece is connected, and the second end of the 13rd capacitor is connected with the pin 27 of first chip；14th electricity
The first end of appearance is connected with the pin 33 of first chip, the 14th second end of capacitor and drawing for first chip
Foot 34 is connected；The second end of 11st capacitor and the second end of the 19th capacitor are grounded.
Wherein, the 12nd capacitor, the 13rd capacitor and the 14th capacitor are CBB20 capacitor.
Wherein, the 4th resistance is identical as the resistance value of the 6th resistance.
Wherein, the resistance value of the 8th resistance is 2 times of the resistance value of the 7th resistance.
Wherein, the resistance value of the twelfth resistor is 39K Ω.
Wherein, the spacing on the main circuit board between weak current part circuit and strong power part circuit is greater than 3.5mm.
Wherein, the linear rectification circuit, analog to digital conversion circuit and governor circuit are independently grounded.
Wherein, decoupling capacitance is connected between the power supply and ground of the governor circuit.
The circuit board automated test device of the embodiment of the present application include: communication interface, main circuit board and for connect to
The detection needle of slowdown monitoring circuit plate；Communication interface is connected with main circuit board, for receiving test control signal from test host computer, and will
Test control signal is transferred to main circuit board；Main circuit board includes linear rectification circuit, analog to digital conversion circuit, governor circuit and electricity
Source circuit；Linear rectification circuit is connected with detection needle, and linear rectification circuit is also connected with analog to digital conversion circuit, analog to digital conversion circuit
Also it is connected with governor circuit；Governor circuit, which is used to send test to circuit board under test by detection needle according to test control signal, to be referred to
It enables, and obtains the testing result for corresponding to test instruction according to the feedback of linear rectification circuit and analog to digital conversion circuit；The master
Control circuit is also used to that the testing result is sent PC to judge the testing result by the communication interface.The circuit board is certainly
The accurate and comprehensive test to circuit board may be implemented in dynamicization test equipment.
Detailed description of the invention
By reading a detailed description of non-restrictive embodiments in the light of the attached drawings below, the application's is other
Feature, objects and advantages will become more apparent upon:
Fig. 1 is a kind of structural block diagram of circuit board automated test device provided by the embodiments of the present application；
Fig. 2 is the circuit theory of the linear rectification circuit of circuit board automated test device provided by the embodiments of the present application
Figure；
Fig. 3 is the simplified equivalent circuit diagram of circuit diagram in Fig. 2；
Fig. 4 is the positive half cycle circuit state figure of Fig. 3 electrical equivalent；
Fig. 5 is the negative half period circuit state figure of Fig. 3 electrical equivalent；
Fig. 6 is the circuit theory of the analog to digital conversion circuit of circuit board automated test device provided by the embodiments of the present application
Figure.
Specific embodiment
It is specifically real to the application with reference to the accompanying drawing in order to keep the purposes, technical schemes and advantages of the application clearer
Example is applied to be described in further detail.It is understood that specific embodiment described herein is used only for explaining the application,
Rather than the restriction to the application.It also should be noted that illustrating only for ease of description, in attached drawing related to the application
Part rather than full content.
Fig. 1 is a kind of structural block diagram of circuit board automated test device provided by the embodiments of the present application, the circuit board
Automated test device can be used for carrying out automated function test to circuit board, and circuit board under test is accessed the electricity when specifically used
Road plate automated test device carries out functional test according to testing process.With reference to Fig. 1, the circuit board automated test device, packet
It includes: communication interface 110, main circuit board 120 and the detection needle 130 for connecting circuit board under test；
The communication interface 110 is connected with the main circuit board 120, for receiving testing and control letter from test host computer
Number, and the test control signal is transferred to the main circuit board 120；
The main circuit board 120 includes linear rectification circuit 121, analog to digital conversion circuit 122, governor circuit 123 and power supply
Circuit 124；The linear rectification circuit 121 is connected with the detection needle 130, the linear rectification circuit 121 also with the mould
Number conversion circuit 122 is connected, and analog-digital conversion circuit as described 122 is also connected with the governor circuit 123；The governor circuit 123
It is instructed for sending test to the circuit board under test by the detection needle 130 according to the test control signal, and according to
The feedback of the linear rectification circuit 121 and analog to digital conversion circuit 122 obtains the testing result for corresponding to the test instruction；
The governor circuit is also used to that the testing result is sent PC to judge the detection by the communication interface
As a result.
The circuit board automated test device includes: communication interface, main circuit board and the inspection for connecting circuit board under test
Stylus；Communication interface is connected with main circuit board, for receiving test control signal from test host computer, and by test control signal
It is transferred to main circuit board；Main circuit board includes linear rectification circuit, analog to digital conversion circuit, governor circuit and power circuit；Linearly
Rectification circuit is connected with detection needle, and linear rectification circuit is also connected with analog to digital conversion circuit, and analog to digital conversion circuit is also electric with master control
Road is connected；Governor circuit, which is used to be sent by detection needle to circuit board under test according to test control signal, tests instruction, and according to
The feedback of linear rectification circuit and analog to digital conversion circuit obtains the testing result for corresponding to test instruction；The governor circuit is also used
In by the communication interface by the testing result send PC to judge the testing result.The circuit board automatic test is set
The standby accurate and comprehensive test that may be implemented to circuit board.
Referring to FIG. 2, it is the circuit diagram of analog to digital conversion circuit, as shown, the linear rectification circuit 121
Including first resistor R1, second resistance R2, transformer T2,3rd resistor R3, the 4th resistance R4, the 5th resistance R5, model
The operational amplifier of LM358, the second diode VD2, third diode VD3, the 6th resistance R6, the 7th resistance R7, the 8th resistance
R8, the 9th resistance R9, the tenth resistance R10, eleventh resistor R11, twelfth resistor R12, the 9th capacitor C9, the first variable resistance
RP1 and the second adjustable resistance RP2；
The first end of the first resistor R1 is connected with firewire inlet wire, the second end and the transformation of the first resistor R1
The first input end of device T2 is connected；The first end of the second resistance R2 is connected with zero curve inlet wire, and the of the second resistance R2
Two ends are connected with the second input terminal of the transformer T2；The first output end of the transformer T2 is with the 3rd resistor R3's
The first end of first end, the first end of the 4th resistance R4 and the 8th resistance R8 is connected；The 4th resistance R4's
Second end and the first of the pin 6 of the operational amplifier, the cathode of the second diode VD2 and the 6th resistance R6
End is connected, and the first end of the 5th resistance R5 is connected with the pin 5 of the operational amplifier；The pin of the operational amplifier
7 are connected with the cathode of the anode of the second diode VD2 and the third diode VD3；The third diode VD3's
Anode is connected with the first end of the second end of the 6th resistance R6 and the 7th resistance R7；The of the 7th resistance R7
Two ends, the second end of the 8th resistance R8, the pin 2 of the operational amplifier, the operational amplifier pin 4, described
The first end access -5V of the first end of twelfth resistor R12, the 9th capacitor C9；The second of the twelfth resistor R12
End, the second end of the 9th capacitor C9, the operational amplifier pin 1 with the second adjustable resistance RP2 first
Fixing terminal is connected；The movable terminal of the second adjustable resistance RP2 accesses power supply；The pin 3 of the operational amplifier
It is connected with the first end of the eleventh resistor R11；The second end of the eleventh resistor R11 is with the tenth resistance R10's
First end and the first end of the 9th resistance R9 are connected；The second end of the 9th resistance R9 and first variable resistance
The movable terminal of RP1 is connected, the first fixing terminal access -5V of the first variable resistance RP1, first variable resistance
The second fixing terminal of RP1 and the pin 8 of the operational amplifier are connected with analog-digital conversion circuit as described 122；The change
The second output terminal of depressor T2, the second end of the 3rd resistor R3, the second end of the 5th resistance R5, the tenth resistance
The second end of R10 and the second fixing terminal of the second adjustable resistance RP2 are grounded.
During specific implementation, the resistance value of wherein resistance can be constrained, the 4th resistance R4 and described the
The resistance value of six resistance R6 is identical, and the resistance value that the 8th resistance R8 also can be set is 2 times of resistance value of the 7th resistance R7.
For other resistance, the parameter adjusted design of corresponding test equipment can be carried out according to the design parameter of circuit board under test, such as
The resistance value of the twelfth resistor R12 is 39K Ω.
The model LM358, LM358 of the operational amplifier used in the present embodiment are dual operational amplifiers, and inside includes
There are two the operational amplifiers that independent, high-gain, internal frequency compensate.It, will in linear rectification circuit shown in Fig. 2
Two operation independent amplifiers of LM358 are individually identified as N3A and N3B, and the input impedance for designing operational amplifier is infinity,
Input current is 0；The voltage of operational amplifier positive-negative input end is equal, i.e., empty short；The Open loop gain cofficient of operational amplifier is
It is infinitely great；Assume that flowing into electric current is positive when calculating, outflow is negative, and on this basis, carries out circuit letter for linear rectification circuit
Change, wherein the negative terminal of N3A is voltage bias, and general bias voltage is 0, it is simplified to Gnd here, the anode resistance eutral grounding of N3B, this
In be simplified to Gnd, simplified circuit is as shown in Figure 3.
For the positive half cycle circuit of simplified linear rectification circuit 121, referring to FIG. 4, for amplifier N3B, it is just defeated
Enter end ground connection, according to empty short principle, P1 point voltage is 0.
∵ Ii1=Vi/Ri1, direction are to flow into
According to Kirchhoff's theorem, P1 point electric current is 0, then Ii1+If1=0
∴ If1=Ii1, direction are outflow
=> Uo1=Ii1 × Rf1, because of current direction, Uo1=-Vi
For amplifier N3A
The direction Ii2a=Uo1/Ri2a=-Vi/Ri2a is outflow
The direction Ii2b=Vi/Ri2b is to flow into
So P2 point electric current Ii2a+Ii2b+If2=0
=> If2=- (Ii2a+Ii2b)
Here the resistance value for enabling Ri2b is 2 times of Ri2a
If2=- (- Vi/Ri2a+Vi/Ri2b)
Here the resistance value of Ri2a is set as R, then the resistance value of Ri2b is 2R, is substituted into
If2=- (- Vi/R+Vi/2R)
=Vi/R-Vi/2R
=Vi/2R, direction are to flow into
Last Vo=If2 × Rf2
Because the resistance value of Rf2 is set as 2R
So Vo=If2 × 2R=Vi/2R × 2R=Vi
For the positive half cycle circuit of simplified linear rectification circuit, referring to FIG. 5, for amplifier N3B
∵ Ii1=Vi/Ri1, direction are outflow
∴ If1=Ii1, direction are to flow into
At this point, VD1 be connected, VD2 cut-off, a point voltage be VD1 saturation voltage drop (about 0.6V) so, due to VD2 cut
Only, Uo1=0
For amplifier N3A
Ii2a=Uo1/Ri2a=0
Ii2b=Vi/Ri2b.Direction is outflow
So P2 point electric current Ii2a+Ii2b+If2=0
=> If2=- (Ii2a+Ii2b)
If2=- (- Vi/Ri2a+Vi/Ri2b)
Here the resistance value of Ri2a is set as R, then the resistance value of Ri2b is 2R, is substituted into
If2=- (- Vi/R-Vi/2R)
=0+Vi/2R
=Vi/2R, direction are to flow into
Last Vo=If2 × Rf2
Because the resistance value of Rf2 is set as 2R
So Vo=If2 × 2R=Vi/2R × 2R=Vi.
The amplification factor of final circuit depends on Rf2, i.e. twelfth resistor R12.
Referring to FIG. 6, it is the circuit diagram of analog to digital conversion circuit, as shown, the analog to digital conversion circuit includes type
Number be ICL7107 the first chip N4, thirteenth resistor R13, the 14th resistance R14, the 15th resistance R15, the 16th resistance
R16, the 17th resistance R17, the tenth capacitor C10, the 11st capacitor C11, the 12nd capacitor C12, the 13rd capacitor C13, the tenth
Four capacitor C14 and the 19th capacitor C19A；
The pin 31 and the 11st capacitor of the first end of the thirteenth resistor R13 and the first chip N4
The first end of C11 is connected, and the second end of the thirteenth resistor R13 exports power supply；The first of the 14th resistance R14
End is connected with the pin 35 of the first end of the 15th resistance R15 and the first chip N4, the 15th resistance R15
Second end be connected with the pin 32 of the first chip N4 and pin 35；The second end of the 14th resistance R14 and institute
State the first end of the 19th capacitor C19A, the second fixing terminal of the first variable resistance RP1 and the operational amplifier
Pin 8 be connected；The first end of the 16th resistance R16 is connected with the pin 39 of the first chip N4, and the described 16th
The second end of resistance R16 is connected with the first end of the pin 40 of the first chip N4 and the tenth capacitor C10, and described
The second end of ten capacitor C10 is connected with the pin 38 of the first chip N4；The first end of the 17th resistance R17 with it is described
The pin 28 of first chip N4 is connected, the first end of the second end of the 17th resistance R17 and the 12nd capacitor C12 with
And the first end of the 13rd capacitor C13 is connected；12nd second end of capacitor C12 and drawing for the first chip N4
Foot 29 is connected, and the second end of the 13rd capacitor C13 is connected with the pin 27 of the first chip N4；14th capacitor
The first end of C14 is connected with the pin 33 of the first chip N4, the second end of the 14th capacitor C14 and first core
The pin 34 of piece N4 is connected；The second end of the 11st capacitor C11 and the second end of the 19th capacitor C19A connect
Ground.
Wherein, the 12nd capacitor C12, the 13rd capacitor C13 and the 14th capacitor C14 are CBB20 capacitor.
In addition, having carried out the design in various details to reduce the interference between component as far as possible, can specifically having there is control
What spacing, grounding scheme between weak current part circuit and strong power part circuit processed were designed between main power source anti-interference sets
Meter.
Wherein, the spacing on the main circuit board 120 between weak current part circuit and strong power part circuit is greater than 3.5mm.
Wherein weak current part refers mainly to the corresponding numerical portion of governor circuit 123, in the present solution, master control core in governor circuit 123
Piece uses M0516LAN, in the specific course of work, when the REQ of main control chip is the level that is lower by high level, sends a survey
Amount is as a result, the P36 pin of main control chip can connect a light emitting diode, the light emitting diode point when measurement result is sent
It is bright, light emitting diode extinguishing is sent, the level change of REQ is determined by external equipment, when the REQ of voltage to be read is by high electricity
The flat level that is lower, resets to high level after 0.1ms, external equipment has received the judgement that voltage can be carried out after measurement result.?
In grounding scheme, the linear rectification circuit 121, analog to digital conversion circuit 122 and governor circuit 123 are independently grounded, also,
121 land used of linear rectification circuit enclose covering.Decoupling capacitance is connected between the power supply and ground of the governor circuit 123.Even
In line design, the line of each pin part is as short as possible and thick.
Note that above are only the preferred embodiment and institute's application technology principle of the application.It will be appreciated by those skilled in the art that
The application is not limited to specific embodiment described here, be able to carry out for a person skilled in the art it is various it is apparent variation,
The protection scope readjusted and substituted without departing from the application.Therefore, although being carried out by above embodiments to the application
It is described in further detail, but the application is not limited only to above embodiments, in the case where not departing from the application design, also
It may include more other equivalent embodiments, and scope of the present application is determined by the scope of the appended claims.
Claims (10)
1. a kind of circuit board automated test device characterized by comprising communication interface, main circuit board and for connect to
The detection needle of slowdown monitoring circuit plate；
The communication interface is connected with the main circuit board, for receiving test control signal from test host computer, and will be described
Test control signal is transferred to the main circuit board；
The main circuit board includes linear rectification circuit, analog to digital conversion circuit, governor circuit and power circuit；The line rectification
Circuit is connected with the detection needle, and the linear rectification circuit is also connected with analog-digital conversion circuit as described, the analog-to-digital conversion electricity
Road is also connected with the governor circuit；The governor circuit is used to pass through the detection needle to institute according to the test control signal
It states circuit board under test and sends test instruction, and corresponded to according to the feedback of the linear rectification circuit and analog to digital conversion circuit
The testing result of the test instruction；
The governor circuit is also used to that the testing result is sent PC to judge the testing result by the communication interface.
2. circuit board automated test device according to claim 1, which is characterized in that the linear rectification circuit includes
First resistor, second resistance, transformer, 3rd resistor, the 4th resistance, the 5th resistance, model LM358 operational amplifier,
Second diode, third diode, the 6th resistance, the 7th resistance, the 8th resistance, the 9th resistance, the tenth resistance, the 11st electricity
Resistance, twelfth resistor, the 9th capacitor, the first variable resistance and the second adjustable resistance；
The first end of the first resistor is connected with firewire inlet wire, and the first of the second end of the first resistor and the transformer
Input terminal is connected；The first end of the second resistance is connected with zero curve inlet wire, the second end of the second resistance and the transformation
Second input terminal of device is connected；First output end of the transformer and first end, the 4th resistance of the 3rd resistor
First end and the 8th resistance first end be connected；4th second end of resistance and drawing for the operational amplifier
The first end of foot 6, the cathode of second diode and the 6th resistance is connected, the first end of the 5th resistance and institute
The pin 5 for stating operational amplifier is connected；The anode of the pin 7 of the operational amplifier and second diode and described the
The cathode of three diodes is connected；The second end and the 7th resistance of the anode of the third diode and the 6th resistance
First end be connected；The second end of 7th resistance, the second end of the 8th resistance, the operational amplifier pin 2,
The pin 4 of the operational amplifier, the first end of the twelfth resistor, the 9th capacitor first end access -5V；Institute
State the second end of twelfth resistor, the second end of the 9th capacitor, the operational amplifier pin 1 can with described second
First fixing terminal of power transformation resistance is connected；The movable terminal of the second adjustable resistance accesses power supply；The operation amplifier
The pin 3 of device is connected with the first end of the eleventh resistor；The second end of the eleventh resistor and the tenth resistance
First end and the first end of the 9th resistance are connected；The second end of 9th resistance and the work of first variable resistance
Moved end is connected, the first fixing terminal access -5V of first variable resistance, the second fixing end of first variable resistance
The pin 8 of the sub and described operational amplifier is connected with analog-digital conversion circuit as described；The second output terminal of the transformer, institute
State the second end of 3rd resistor, the second end of the 5th resistance, the second end of the tenth resistance and described second variable
Second fixing terminal of resistance is grounded.
3. circuit board automated test device according to claim 2, which is characterized in that analog-digital conversion circuit as described includes
The first chip, thirteenth resistor, the 14th resistance, the 15th resistance, the 16th resistance, the 17th electricity of model ICL7107
Resistance, the tenth capacitor, the 11st capacitor, the 12nd capacitor, the 13rd capacitor, the 14th capacitor and the 19th capacitor；
The first end of the thirteenth resistor and the pin 31 of first chip and the first end phase of the 11st capacitor
Even, the second end of the thirteenth resistor exports power supply；The first end of 14th resistance and the 15th resistance
First end and first chip pin 35 be connected, the 15th second end of resistance and drawing for first chip
Foot 32 and pin 35 are connected；The second end of 14th resistance and the first end of the 19th capacitor, described first can
Second fixing terminal of power transformation resistance and the pin 8 of the operational amplifier are connected；The first end of 16th resistance and institute
The pin 39 for stating the first chip is connected, the second end of the 16th resistance and the pin 40 of first chip and described the
The first end of ten capacitors is connected, and the second end of the tenth capacitor is connected with the pin 38 of first chip；Described 17th
The first end of resistance is connected with the pin 28 of first chip, the second end of the 17th resistance and the 12nd capacitor
First end and the 13rd capacitor first end be connected；The second end of 12nd capacitor and first chip
Pin 29 is connected, and the second end of the 13rd capacitor is connected with the pin 27 of first chip；14th capacitor
First end is connected with the pin 33 of first chip, the second end of the 14th capacitor and the pin 34 of first chip
It is connected；The second end of 11st capacitor and the second end of the 19th capacitor are grounded.
4. circuit board automated test device according to claim 3, which is characterized in that the 12nd capacitor, the tenth
Three capacitors and the 14th capacitor are CBB20 capacitor.
5. circuit board automated test device according to claim 2, which is characterized in that the 4th resistance and described the
The resistance value of six resistance is identical.
6. circuit board automated test device according to claim 2, which is characterized in that the resistance value of the 8th resistance is
2 times of the resistance value of 7th resistance.
7. circuit board automated test device according to claim 2, which is characterized in that the resistance value of the twelfth resistor
For 39K Ω.
8. circuit board automated test device according to claim 1, which is characterized in that light current portion on the main circuit board
Spacing between parallel circuit and strong power part circuit is greater than 3.5mm.
9. circuit board automated test device according to claim 1, which is characterized in that the linear rectification circuit, mould
Number conversion circuit and governor circuit are independently grounded.
10. circuit board automated test device according to claim 9, which is characterized in that the power supply of the governor circuit
Decoupling capacitance is connected between ground.
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| CN201822165764.2U CN209296877U (en) | 2018-12-20 | 2018-12-20 | A kind of circuit board automated test device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201822165764.2U CN209296877U (en) | 2018-12-20 | 2018-12-20 | A kind of circuit board automated test device |
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| CN209296877U true CN209296877U (en) | 2019-08-23 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113206608A (en) * | 2021-04-26 | 2021-08-03 | 四川优力源电子科技有限公司 | Special processing device for signal mechanical room power safety |
| CN113419160A (en) * | 2021-06-18 | 2021-09-21 | 珠海美佳音科技有限公司 | Chip detection interface circuit |
-
2018
- 2018-12-20 CN CN201822165764.2U patent/CN209296877U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113206608A (en) * | 2021-04-26 | 2021-08-03 | 四川优力源电子科技有限公司 | Special processing device for signal mechanical room power safety |
| CN113419160A (en) * | 2021-06-18 | 2021-09-21 | 珠海美佳音科技有限公司 | Chip detection interface circuit |
| CN113419160B (en) * | 2021-06-18 | 2023-09-29 | 珠海美佳音科技有限公司 | Chip detection interface circuit |
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