CN108469582A - A kind of test circuit - Google Patents
A kind of test circuit Download PDFInfo
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- CN108469582A CN108469582A CN201810112524.8A CN201810112524A CN108469582A CN 108469582 A CN108469582 A CN 108469582A CN 201810112524 A CN201810112524 A CN 201810112524A CN 108469582 A CN108469582 A CN 108469582A
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- module
- electrically connected
- voltage
- reference voltage
- output end
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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
- G01R31/282—Testing of electronic circuits specially adapted for particular applications not provided for elsewhere
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/28—Provision in measuring instruments for reference values, e.g. standard voltage, standard waveform
Abstract
The present invention provides a kind of test circuit, including：The first end of pressure drop module is electrically connected with the first power module；Reference voltage adjustment module is used to export adjustable reference voltage by reference to voltage output end；The first input end of voltage comparison module is electrically connected with the second end of pressure drop module, and the second input terminal is electrically connected with reference voltage output terminal；First voltage adjustment module is used to export adjustable voltage by adjustable voltage output end；The voltage input end of second Voltage stabilizing module is electrically connected with the second end of pressure drop module, and the second reference potential end is electrically connected with adjustable voltage output end；The trigger signal input terminal of control module is electrically connected with comparison result output end；Break-make module by signal receiving terminal is electrically connected with the first control signal output end of control module, and the first connecting pin is electrically connected with the output end of pressure-stabilizing of the second Voltage stabilizing module, and second connection end is electrically connected with electronic equipment to be measured.
Description
Technical field
The present invention relates to electronic technology field more particularly to a kind of test circuits.
Background technology
In the factory, it after a certain electronic product has produced, needs to test the performance parameter of electronic product, to subtract
Few defect ware, improves the quality of manufacture electronic product.Electronic product needs performance parameter to be tested to generally comprise input voltage, work
Make electric current etc., wherein the nominal input voltage of electronic product to be measured is usually the voltage in a certain range, therefore, in test
After needing the voltage in test input nominal range, whether electronic product can work normally.During test, when to be measured
After electronic product input test voltage, the case where which is possible to will produce overcurrent, if long-time overcurrent can be to electricity
Sub- product damages.
Invention content
One of present invention seek to address that the above problem/.
The main purpose of the present invention is to provide a kind of test circuits.
In order to achieve the above objectives, technical scheme of the present invention is specifically realized in：
The present invention provides a kind of test circuit, including the first power module, pressure drop module, reference voltage adjustment module,
Voltage comparison module, control module, the first break-make module, first voltage adjustment module and the second Voltage stabilizing module, wherein the first electricity
Source module, for providing power supply；Pressure drop module, including first end and second end, wherein first end is electrically connected with the first power module
It connects；Reference voltage adjustment module, for exporting adjustable reference voltage by reference to voltage output end；Voltage comparison module,
Including first input end, the second input terminal and comparison result output end, wherein the second end electricity of first input end and pressure drop module
Connection, the second input terminal are electrically connected with reference voltage output terminal；First voltage adjustment module, for passing through adjustable voltage output end
Export adjustable voltage；Second Voltage stabilizing module, including voltage input end, output end of pressure-stabilizing and the second reference potential end, voltage
Input terminal is electrically connected with the second end of pressure drop module, and the second reference potential end is electrically connected with adjustable voltage output end；Control module,
Including trigger signal input terminal and first control signal output end, wherein trigger signal input terminal and comparison result output end electricity
Connection；Control module is additionally operable to touching for sending conductivity control signal to break-make module by first control signal output end
After signalling input terminal receives trigger signal, is sent to break-make module by first control signal output end and disconnect control letter
Number；Break-make module, including the first connecting pin, second connection end and signal receiving end, wherein signal receiving end and control module
First control signal output end is electrically connected, and the first connecting pin is electrically connected with the output end of pressure-stabilizing of the second Voltage stabilizing module, the second connection
End is electrically connected with electronic equipment to be measured；When signal receiving end receives conductivity control signal, the first connecting pin is connect with second
End conducting；When signal receiving end receives disconnection control signal, the access of the first connecting pin and second connection end disconnects.
In addition, reference voltage adjustment module, including second power supply module, the first reference voltage module, the first Voltage stabilizing module
With the first variable resistance module, wherein the first reference voltage module, including the first power input and the output of the first reference voltage
End, wherein the first power input is electrically connected with second power supply module, and the first reference voltage output end output voltage values are fixed
First reference voltage；First Voltage stabilizing module, including the first reference potential end, adjustable end and reference voltage output terminal, wherein first
Reference potential end is electrically connected with the first reference voltage output end, and for receiving the first reference voltage, adjustable end is with first with reference to electricity
Voltage difference between the end of position is a fixed value；First variable resistance module, including the first fixing end, the second fixing end and first are slided
Moved end, wherein the first fixing end is electrically connected with reference voltage output terminal, and the second fixing end is electrically connected with the first reference potential end,
First sliding end is electrically connected with adjustable end；Resistance between first sliding end and the first fixing end is adjustable.
In addition, reference voltage adjustment module further includes first resistor and second resistance, wherein the first fixing end and reference electricity
Output end electrical connection is pressed, including：First fixing end is electrically connected with one end of first resistor, the other end and the reference electricity of first resistor
Press output end electrical connection；Second fixing end is electrically connected with the first reference potential end, including：The one of second fixing end and second resistance
End electrical connection, the other end of second resistance are electrically connected with the first reference potential end.
In addition, first voltage adjustment module include third power module, the 4th power module, the second reference voltage module,
Third reference voltage module, the second adjustable resistance module and third Voltage stabilizing module；Wherein, the second reference voltage module, including the
Two power inputs and the second reference voltage output end, wherein second source input terminal is electrically connected with third power module, and second
Fixed second reference voltage of reference voltage output end output voltage values；Third reference voltage module, including third power input
End and third reference voltage output end, wherein third power input is electrically connected with the 4th power module, and third reference voltage is defeated
The fixed third reference voltage of outlet output voltage values；The second adjustable resistance module, including third fixing end, the 4th fixing end and
Second sliding end, wherein third fixing end is electrically connected with the second reference voltage output end, the 4th fixing end and third reference voltage
Output end is electrically connected, and the resistance between the second sliding end and the 4th fixing end is adjustable；Third Voltage stabilizing module, including third is with reference to electricity
Position end and adjustable voltage output end, wherein third reference potential end is electrically connected with the second sliding end.
In addition, first voltage adjustment module further includes 3rd resistor and the 4th resistance；Third fixing end and the second benchmark electricity
Output end electrical connection is pressed, including：Third fixing end is electrically connected with one end of 3rd resistor, the other end of 3rd resistor and the second base
Quasi- voltage output end electrical connection；4th fixing end is electrically connected with third reference voltage output end, including：4th fixing end and the 4th
One end of resistance is electrically connected, and the other end of the 4th resistance is electrically connected with third reference voltage output end.
In addition, control module further includes second control signal output end；Circuit further includes discharge module, wherein electric discharge mould
Block includes discharge control signal input terminal, signal input part to be discharged and ground terminal, and discharge control signal input terminal and second are controlled
Signal output end electrical connection processed, signal input part to be discharged are electrically connected with second connection end, ground terminal ground connection；Signal to be discharged is defeated
Enter end, for after discharge control signal input terminal receives discharge control signal, being connected with ground terminal.
As seen from the above technical solution provided by the invention, the present invention provides a kind of test circuits, pass through the survey
When examination circuit tests electronic equipment to be measured, on the one hand it can be more than nominally most in the input current of electronic equipment to be measured
The supply access to electronic equipment to be measured is disconnected when big input current, is prevented electronic equipment to be measured from over-current phenomenon avoidance occurs, is caused to wait for
Survey the damage of electronic equipment；On the other hand due to reference voltage adjustment module output reference voltage be it is adjustable, can
It is tested with the electronic equipment to be measured to nominal different maximum input currents, expands the application range of the test circuit；Separately
Outside, since the output voltage of first voltage adjustment module can be adjusted, then the electricity at the reference potential end of the second Voltage stabilizing module is inputted
Pressure can be adjusted, i.e. the second Voltage stabilizing module can provide different supply voltages for electronic equipment to be measured, be waited for test
Survey whether electronic equipment can work normally under different power voltage.
Description of the drawings
In order to illustrate the technical solution of the embodiments of the present invention more clearly, required use in being described below to embodiment
Attached drawing be briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for this
For the those of ordinary skill in field, without creative efforts, other are can also be obtained according to these attached drawings
Attached drawing.
Fig. 1 is the structural schematic diagram for the test circuit that the embodiment of the present invention 1 provides；
Fig. 2 is another structural schematic diagram for the test circuit that the embodiment of the present invention 1 provides
Fig. 3 is a kind of structural schematic diagram for the reference voltage adjustment module that the embodiment of the present invention 1 provides；
Fig. 4 is another structural schematic diagram for the reference voltage adjustment module that the embodiment of the present invention 1 provides；
Fig. 5 is a kind of structural schematic diagram for the first voltage adjustment module that the embodiment of the present invention 1 provides；
Fig. 6 is another structural schematic diagram for the first voltage adjustment module that the embodiment of the present invention 1 provides.
Specific implementation mode
With reference to the attached drawing in the embodiment of the present invention, technical solution in the embodiment of the present invention carries out clear, complete
Ground describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Based on this
The embodiment of invention, every other implementation obtained by those of ordinary skill in the art without making creative efforts
Example, belongs to protection scope of the present invention.
In the description of the present invention, it is to be understood that, term "center", " longitudinal direction ", " transverse direction ", "upper", "lower",
The orientation or positional relationship of the instructions such as "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside" is
It is based on the orientation or positional relationship shown in the drawings, is merely for convenience of description of the present invention and simplification of the description, rather than instruction or dark
Show that signified device or element must have a particular orientation, with specific azimuth configuration and operation, therefore should not be understood as pair
The limitation of the present invention.In addition, term " first ", " second " are used for description purposes only, it is not understood to indicate or imply opposite
Importance or quantity or position.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
Can also be electrical connection to be mechanical connection；It can be directly connected, can also indirectly connected through an intermediary, Ke Yishi
Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood at this with concrete condition
Concrete meaning in invention.
The embodiment of the present invention is described in further detail below in conjunction with attached drawing.
Embodiment 1
The present embodiment provides a kind of test circuits, as shown in Figure 1, including the first power module, pressure drop module, reference voltage
Adjustment module, voltage comparison module, control module, the first break-make module, first voltage adjustment module and the second Voltage stabilizing module,
In, the first power module, for providing power supply；Pressure drop module, including first end and second end, wherein first end and the first electricity
Source module is electrically connected；Reference voltage adjustment module, for exporting adjustable reference voltage by reference to voltage output end；Voltage
Comparison module, including first input end, the second input terminal and comparison result output end, wherein first input end and pressure drop module
Second end electrical connection, the second input terminal is electrically connected with reference voltage output terminal；First voltage adjustment module, for by adjustable
Voltage output end exports adjustable voltage；Second Voltage stabilizing module, including voltage input end, output end of pressure-stabilizing and second are with reference to electricity
Position end, voltage input end are electrically connected with the second end of pressure drop module, and the second reference potential end is electrically connected with adjustable voltage output end；
Control module, including trigger signal input terminal and first control signal output end, wherein trigger signal input terminal and comparison result
Output end is electrically connected；Control module, for sending conductivity control signal to break-make module by first control signal output end, also
For after trigger signal input terminal receives trigger signal, being sent and being disconnected to break-make module by first control signal output end
Control signal；Break-make module, including the first connecting pin, second connection end and signal receiving end, wherein signal receiving end and control
The first control signal output end of module is electrically connected, and the first connecting pin is electrically connected with the output end of pressure-stabilizing of the second Voltage stabilizing module, the
Two connecting pins are electrically connected with electronic equipment to be measured；When signal receiving end receives conductivity control signal, the first connecting pin and the
Two connecting pins are connected；When signal receiving end receives disconnection control signal, the access of the first connecting pin and second connection end is disconnected
It opens.
In the present embodiment, pressure drop module is the device that resistance value determines, for example, resistance or other devices that can be divided
Part.For convenience of description, the resistance value of pressure drop module is denoted as R, and the size of specific resistance value does not limit.
In the present embodiment, break-make module may include one or more physical switch, can also include one or more
Virtual switch can also include other one or more switching devices, can also be above-mentioned three kinds of arbitrary combination, this implementation
Example is not specifically limited.
In the present embodiment, after the power is turned on, the first control signal output end output conducting of control module controls test circuit
Signal, after break-make module receives conductivity control signal, the first connecting pin of break-make module is connected with second connection end.Break-make mould
Behind first connecting pin of block and second connection end conducting, the first power module can be pressure drop module, the second Voltage stabilizing module, break-make mould
Block and power electronic equipment to be measured.For convenience of description, the voltage of the first power module is denoted as Uc, specific voltage value do not limit,
As long as the voltage within the scope of nominal voltage can be provided for electronic equipment to be measured.
In the present embodiment, the second Voltage stabilizing module is for providing stable input voltage for electronic equipment to be measured, to prevent
After electronic equipment access test circuit to be measured, electronic equipment to be measured actually enters voltage not in the specified defeated of electronic equipment to be measured
Enter in voltage range, cause the damage of electronic equipment to be measured, influence of the input voltage to current detecting can also be reduced.
In the present embodiment, after electronic equipment access test circuit to be measured, since electronic equipment to be measured may in production
There are defect wares then in the first power module, pressure drop module, the second Voltage stabilizing module, break-make module and this time of electronic equipment to be measured
Real work electric current in road may be more than the nominal maximum input current I of electronic equipment to be measuredmax, generate over-current phenomenon avoidance.
In the present embodiment, when testing electronic equipment to be measured, the reference electricity of reference voltage adjustment module output
Press VrefIt is set as Uc-Imax* R, specifically can be according to the nominal maximum input current I of electronic equipment to be measuredmaxSetting.
In the present embodiment, the first input end of voltage comparison module is inverting input, and the second input terminal is with mutually defeated
Enter end.Once the electric current that actually enters of electronic equipment to be measured is more than nominal maximum input current namely electronic equipment mistake to be measured
When stream, the voltage of the inverting input input of voltage comparison module is less than the reference voltage of in-phase input end input, and voltage compares
The comparison result output end of module exports high level signal.The trigger signal that the trigger signal input terminal of control module receives is height
Level signal, after trigger signal input terminal receives high level signal, the output of first control signal output end disconnects control signal.
After break-make module receives disconnection control signal, the first connecting pin of break-make module and the access of second connection end disconnect.It can be with
Find out, the test circuit in the present embodiment is more than nominal maximum input current in the real work electric current of electronic equipment to be measured
Afterwards, the supply access to electronic equipment to be measured is disconnected, the protection to electronic equipment to be measured is realized, prevents that electronics to be measured is caused to set
Standby damage.
As a kind of optional embodiment of the present embodiment, control module can realize that trigger signal is defeated by controlling chip
Enter an input port of end chip in order to control, an output port of first control signal output end chip in order to control.Into
When row test, after the power is turned on, whether control chip querying triggering signal input part receives high level signal to control chip, if do not had
High level signal is received, then conductivity control signal is sent to break-make module by the first signal output end；If controlling core
Piece inquires trigger signal input terminal and receives high level signal, then is sent and disconnected to break-make module by the first signal output end
Control signal.
In this optional embodiment, control module further includes second control signal output end, second control signal output
End is electrically connected with discharge module.In concrete application, an output port of second control signal output end chip in order to control is used for
In electronic equipment overcurrent to be measured or after test, second control signal output end sends control of discharge letter to discharge module
Number.
As another optional embodiment of the present embodiment, control module also can be by controlling chip and NE555 chips
It realizes, wherein control chip includes the first control terminal, and the first control terminal is electrically connected with the low level triggering end (2 foot) of NE555；
The high level triggering end (6 foot) of NE555 is electrically connected with the comparison result output end of voltage comparison module, the output end (3 of NE555
Foot) it is electrically connected with the signal receiving end of break-make module as first control signal output end.It controls chip after the power is turned on, controls chip
The first control terminal export high level signal, i.e. the low level triggering end (2 foot) of NE555 receives high level signal, if not
Overcurrent, then the output end (3 foot) of NE555 export high level signal, i.e., control module by first control signal output end to logical
Disconnected module sends high level signal as conductivity control signal, and the first connecting pin of break-make module is connected with second connection end；Such as
Fruit overcurrent, then the high level triggering end (6 foot) of NE555 receive high level signal, then NE555 output end (3 foot) output it is low
Level signal, i.e. control module send low level signal to break-make module by first control signal output end and are used as disconnection control
Signal, the first connecting pin and the second connection end of break-make module disconnect.
In this optional embodiment, when conductivity control signal is high level signal, disconnection control signal is believed for low level
Number when, break-make module can be NMOS tube, and the drain electrode (poles D) of NMOS tube is used as the first connecting pin, the source electrode (poles S) of NMOS tube to make
Grid (poles G) for second connection end, NMOS tube is used as signal input part.As the grid (G of signal input part in NMOS tube
Pole) receive the high level signal of NE555 output ends (3 foot) transmission after, drain electrode (poles D) as the first connecting pin and the second company
Connect source electrode (poles the S) conducting at end.The output end for receiving NE555 in NMOS tube as the grid of signal input part (poles G) is sent
Low level signal after, as the first connecting pin drain electrode (poles D) and second connection end source electrode (poles S) disconnect.It needs to illustrate
, the voltage U of the high level signal of triggering NMOS tube conductinggMeet following condition：Ug-Us>0, and | Ug-Us |>|Ugs
(th) |, wherein Ugs (th) is cut-in voltage.
In this optional embodiment, control chip further includes the second control terminal, the reset terminal of the second control terminal and NE555
(4 foot) is electrically connected.In concrete application, after test, tester controls the second control terminal by switch and exports low level
Signal, after the reset terminal (4 foot) of NE555 receives the low level signal that control chip is sent, the output end (3 foot) of NE555 is defeated
Go out low level signal, i.e. control module is used as disconnection by first control signal output end to break-make module transmission low level signal
Signal is controlled, the first connecting pin and the second connection end of break-make module disconnect.
In this optional embodiment, test circuit further includes reminding module, discharge end (7 foot) and the prompt mould of NE555
Block is electrically connected；Since the discharge end (7 foot) of NE555 is consistent with output end (3 foot) output level, then reminding module can be used for connecing
After the low level signal of discharge end transmission for receiving NE555, tester's electronic equipment overcurrent to be measured is prompted.
In this optional embodiment, control module further includes electric discharge control other than including control chip, NE555 chips
Molding block, wherein control of discharge module includes the first signal end, second signal end and second control signal output end, the first letter
Number end is electrically connected with the first control terminal, and second signal end is electrically connected with the second control terminal, second control signal output end and electric discharge
Module is electrically connected.In concrete application, when electronic equipment overcurrent to be measured or test after, second control signal output end to
Discharge module sends discharge control signal.
As a kind of optional embodiment of the present embodiment, as shown in Fig. 2, test circuit further includes discharge module, wherein
The discharge module includes discharge control signal input terminal, signal input part to be discharged and ground terminal, the discharge control signal
Input terminal is electrically connected with the second control signal output end, and the signal input part to be discharged is electrically connected with the second connection end
It connects, the ground terminal ground connection；The signal input part to be discharged, for receiving electric discharge in the discharge control signal input terminal
After controlling signal, be connected with the ground terminal.In concrete application, the second control signal that discharge module receives control module is defeated
After the discharge control signal that outlet is sent, discharge electronic equipment to be measured, to prevent aftercurrent from being caused to electronic equipment
Damage.
In this optional embodiment, discharge module can be realized by switch module, such as triode, metal-oxide-semiconductor, controllably be opened
Close etc., the present embodiment is not specifically limited, as long as after discharge control signal input terminal receives discharge control signal, letter to be discharged
Number input terminal can be connected within protection scope of the present invention with ground terminal.
As a kind of optional embodiment of the present embodiment, as shown in figure 3, reference voltage adjustment module, including the second electricity
Source module, the first reference voltage module, the first Voltage stabilizing module and the first variable resistance module, wherein the first reference voltage module,
Including the first power input and the first reference voltage output end, wherein the first power input is electrically connected with second power supply module
It connects, fixed first reference voltage of the first reference voltage output end output voltage values；First Voltage stabilizing module, including the first reference electricity
Position end, adjustable end and reference voltage output terminal, wherein the first reference potential end is electrically connected with the first reference voltage output end, is used
In receiving the first reference voltage, the voltage difference between adjustable end and the first reference potential end is a fixed value；First variable resistance
Module, including the first fixing end, the second fixing end and the first sliding end, wherein the first fixing end and reference voltage output terminal electricity
Connection, the second fixing end are electrically connected with the first reference potential end, and the first sliding end is electrically connected with adjustable end；First sliding end and
Resistance between one fixing end is adjustable.
In this optional embodiment, the first fixing end is high resistance end, and the second fixing end is low resistance end；Alternatively, the
One fixing end is low resistance end, and the second fixing end is high resistance end.That is, between adjustable end and the first reference potential end
Resistance can be the resistance between resistance value or the first sliding end and high resistance end between the first sliding end and low resistance end
Value, the present embodiment are not specifically limited.
In this optional embodiment, the first variable resistance module can be slide rheostat, can also be mechanical current potential
Device or digital regulation resistance, the present embodiment are not specifically limited.As a preferred embodiment, the first variable resistance module is
Digital regulation resistance, digital regulation resistance can be by digital control scheme adjusting resistance values, and degree of regulation is high.
In this optional embodiment, the nominal maximum value of the first variable resistance module is denoted as Rmax1Namely first is solid
Resistance between fixed end and the second fixing end is Rmax1, the resistance value R between the first sliding end and the first fixing endw1It is adjustable
, it can specifically adjust one of in the following way：
Mode one：When the first variable resistance module is mechanical potentiometer, the first sliding end is changeable along resistive element sliding
Resistance value between first sliding end and the first fixing end；
Mode two：When the first variable resistance module is digital regulation resistance, the first sliding end can be adjusted by digital control scheme
With the resistance value between the first fixing end.
In this optional embodiment, the voltage difference U between adjustable end and the first reference potential endfFor a fixed value, example
Such as, when the first Voltage stabilizing module is realized by NCP3335, the potential difference U between adjustable end and the first reference potential endfFor 1.25V.The
The voltage U of one reference voltage module outputr1The the first reference potential end for accessing the first Voltage stabilizing module, to raise the first voltage stabilizing mould
The voltage value of block output.
In this optional embodiment, since the potential difference between adjustable end and the first reference potential end is fixed, and
Resistance between adjustable end and the first reference potential end is adjustable, then the electric current in the first variable resistance module is with adjustable
It holds the resistance variations between the first reference potential end and changes, the voltage of reference voltage output terminal output also changes therewith.
In the present embodiment, due to the reference voltage V of reference voltage adjustment module outputrefIt can be variable by adjusting first
Resistance between resistive module and the first fixing end and be adjusted, therefore can be to the to be measured of nominal different maximum input currents
Electronic equipment is tested, and the application range of the test circuit is expanded.
As a kind of preferred embodiment of the present embodiment, reference voltage adjustment module further includes first resistor and the second electricity
Resistance；First fixing end is electrically connected with reference voltage output terminal, including：First fixing end is electrically connected with one end of first resistor, the
The other end of one resistance is electrically connected with reference voltage output terminal；Second fixing end is electrically connected with the first reference potential end, including：The
Two fixing ends are electrically connected with one end of second resistance, and the other end of second resistance is electrically connected with the first reference potential end.
In a presently preferred embodiment, as shown in figure 4, the first fixing end passes through first resistor R1With the first Voltage stabilizing module
Reference voltage output terminal connects, and the second fixing end passes through second resistance R2It is connect with the reference potential end of the first Voltage stabilizing module.It is logical
Setting first resistor and second resistance are crossed, the real work electric current of the first variable resistance module can be prevented excessive, cause device
Damage.
In the preferred embodiment,As can be seen that working as
Rw1When resistance minimum when=0 namely between the first sliding end and the second fixing end, the ginseng of reference voltage output terminal reality output
Examine voltage VrefMaximum isWork as Rw=Rmax1When namely the first sliding end and second solid
When resistance maximum between fixed end, the reference voltage V of reference voltage output terminal reality outputrefMinimum is
In specifically design circuit, it is assumed that the nominal maximum input current I of the electronic equipment of different batches to be measuredmax's
Ranging from I1~I2, then to ensure that all electronic equipments of maximum input current nominally in the range can be tested, join
Examine voltage VrefIt is adjustable ranging from least to ensure in (Uc-I2* R)~(Uc-I1* R) between, namely need to ensure：
As can be seen that during actual design circuit, by the first base for changing the output of the first reference voltage module
Quasi- voltage Ur1, first resistor R1, second resistance R2, and the first different variable resistance module R of nominal maximum valuemax1
To change reference voltage adjustment module actually adjustable voltage range.In the practical adjustable voltage of reference voltage adjustment module
In the case of range is fixed, the resistance R between the first sliding end and the first fixing end by adjusting the first variable resistance modulew1
The reference voltage V of reference voltage adjustment module reality output can be changedref, due to the reference of reference voltage adjustment module output
Voltage VrefAdjustable, thus can detect the different electronic equipment to be measured of nominal maximum input current whether overcurrent, expand
The application range of the test circuit.
In the present embodiment, it is adjusted by the voltage that adjustable voltage output end exports due to first voltage adjustment module,
And the adjustable voltage output end of first voltage adjustment module is electrically connected with the second reference potential end of the second Voltage stabilizing module, then first
The voltage value of VRM Voltage Regulator Module output can raise the voltage value namely second of the output end of pressure-stabilizing output of the second Voltage stabilizing module
The voltage value that the voltage value of the output end of pressure-stabilizing output of Voltage stabilizing module can be exported with first voltage adjustment module changes and changes.
During test, the voltage value of output end of pressure-stabilizing output is adjusted by first voltage adjustment module, can be adjusted to be measured
Whether the supply voltage of electronic equipment can work normally to test in electronic equipment to be measured in a certain input voltage range.
As a kind of optional embodiment of the present embodiment, as shown in figure 5, first voltage adjustment module includes third power supply
Module, the 4th power module, the second reference voltage module, third reference voltage module, the second adjustable resistance module and third are steady
Die block；Wherein, the second reference voltage module, including second source input terminal and the second reference voltage output end, wherein second
Power input is electrically connected with third power module, the fixed second benchmark electricity of the second reference voltage output end output voltage values
Pressure；Third reference voltage module, including third power input and third reference voltage output end, wherein third power input
End is electrically connected with the 4th power module, the fixed third reference voltage of third reference voltage output end output voltage values；Second can
Become resistive module, including third fixing end, the 4th fixing end and the second sliding end, wherein third fixing end and the second benchmark electricity
Output end electrical connection, the 4th fixing end is pressed to be electrically connected with third reference voltage output end, the second sliding end is fixed with the described 4th
Resistance between end is adjustable；Third Voltage stabilizing module, including third reference potential end and adjustable voltage output end, wherein third is joined
Potential end is examined to be electrically connected with the second sliding end.In this optional embodiment, by adjust the second adjustable resistance module second
Resistance value between sliding end and the 4th fixing end can adjust the voltage value of first voltage adjustment module output.
In this optional embodiment, third fixing end is the high resistance end of the second adjustable resistance module, the 4th fixing end
For the low resistance end of the second adjustable resistance module；Alternatively, third fixing end is the low resistance end of the second adjustable resistance module, the 4th
Fixing end is the high resistance end of the second adjustable resistance module, and the present embodiment is not specifically limited.
In this optional embodiment, the second adjustable resistance module can be slide rheostat, can also be mechanical current potential
Device or digital regulation resistance, the present embodiment are not specifically limited.As a preferred embodiment, the second adjustable resistance module is
Digital regulation resistance, digital regulation resistance can be by digital control scheme adjusting resistance values, and degree of regulation is high.
In this optional embodiment, the resistance value R between the second sliding end and the 4th fixing endw2Be it is adjustable, specifically
It can adjust one of in the following way：
Mode one：When the second adjustable resistance module is mechanical potentiometer, the second sliding end is changeable along resistive element sliding
Resistance value between second sliding end and the 4th fixing end；
Mode two：When the second adjustable resistance module is digital regulation resistance, the second sliding end can be adjusted by digital control scheme
With the resistance value between the 4th fixing end.
In this optional embodiment, below only using third fixing end as high resistance end, the 4th fixing end is low resistance end
For illustrate, for convenience of description, the second reference voltage module output the second reference voltage be denoted as Ur2, third reference voltage
The third reference voltage of module output is denoted as Ur3, then the electricity between the second reference voltage output end and third reference voltage output end
Pressure difference is Ur2-Ur3, the nominal maximum value of the second adjustable resistance module is denoted as Rmax2, when the second sliding end and the 4th fixing end it
Between resistance be denoted as Rw2When, then the voltage of the second sliding end output isAs can be seen that passing through
The resistance for adjusting the second sliding end access the second adjustable resistance module, can adjust the output voltage of the second sliding end.
In this optional embodiment, first voltage adjustment module further includes 3rd resistor and the 4th resistance；Third is fixed
End is electrically connected with the second reference voltage output end, including：Third fixing end is electrically connected with one end of 3rd resistor, 3rd resistor
The other end is electrically connected with the second reference voltage output end；4th fixing end is electrically connected with third reference voltage output end, including：The
Four fixing ends are electrically connected with one end of the 4th resistance, and the other end of the 4th resistance is electrically connected with third reference voltage output end.
In concrete application, as shown in fig. 6, third fixing end is connect by 3rd resistor with the second reference voltage output end,
4th fixing end is connect by the 4th resistance with third reference voltage output end.For convenience of description, 3rd resistor is set as R3, the
Four resistance are set as R4, then the second sliding end output voltage value beAs can be seen that logical
Cross the second reference voltage U for changing the output of the second reference voltage moduler2, third reference voltage module output third reference voltage
Ur3, the second adjustable resistance module nominal maximum value Rmax2, 3rd resistor R3, the 4th resistance R4The second sliding can be changed
The voltage value of end output can change above-mentioned parameter according to actual needs when designing circuit, and the present embodiment is not specifically limited.
In Ur2、Ur3、Rmax2、R3And R4In the test circuit determined, by the second sliding for changing the second adjustable resistance module
Resistance value R between end and the 4th fixing endw2The voltage value of the second sliding end output can be changed.
In this optional embodiment, third Voltage stabilizing module can be realized by voltage stabilizing chip (such as AP2210), can also be led to
Regulator circuit realization is crossed, the present embodiment is not specifically limited.
The present embodiment provides a kind of test circuits, when being tested electronic equipment to be measured by the test circuit, a side
Face can disconnect the confession to electronic equipment to be measured when the input current of electronic equipment to be measured is more than nominal maximum input current
Electric pathway prevents electronic equipment to be measured from over-current phenomenon avoidance occurs, causes the damage of electronic equipment to be measured；On the other hand due to reference to electricity
It is adjustable to press the reference voltage of adjustment module output, therefore can be set to the electronics to be measured of nominal different maximum input currents
It is standby to be tested, expand the application range of the test circuit；In addition, due to the reference potential end for inputting the second Voltage stabilizing module
Voltage can be adjusted, then the second Voltage stabilizing module can provide different supply voltages for electronic equipment to be measured, to test
Whether electronic equipment to be measured can work normally under different power voltage.
Embodiment 2
Unlike embodiment 1, the first input end of the voltage comparison module in the present embodiment is in-phase input end,
Second input terminal is inverting input, once the electric current that actually enters of electronic equipment to be measured is more than nominal maximum input current,
Namely when electronic equipment overcurrent to be measured, the voltage of the in-phase input end input of voltage comparison module is less than inverting input input
The comparison result output end of reference voltage, voltage comparison module exports low level signal.The trigger signal input terminal of control module
The trigger signal of reception is low level signal, after trigger signal input terminal receives low level signal, first control signal output
End output disconnects control signal.After break-make module receives disconnection control signal, the first connecting pin of break-make module connects with second
The access for connecing end disconnects.
In addition, control module can be realized by controlling chip in embodiment 1, it also can be common by controlling chip and NE555
It realizes, as different from Example 1, the control module in the present embodiment is realized by controlling chip, when control module passes through control
When coremaking piece is realized, an input port of trigger signal input terminal chip in order to control, first control signal output end is in order to control
One output port of chip, when being tested, after the power is turned on, whether control chip querying triggering signal input part for control chip
Low level signal is received, if being not received by low level signal, is sent to break-make module by the first signal output end
Conductivity control signal；If control chip inquires trigger signal input terminal and receives low level signal, pass through the first signal
Output end is sent to break-make module disconnects control signal.
Other unaccomplished matters are in the same manner as in Example 1, and this embodiment is not repeated.
Any process described otherwise above or method description are construed as in flow chart or herein, and expression includes
It is one or more for realizing specific logical function or process the step of executable instruction code module, segment or portion
Point, and the range of the preferred embodiment of the present invention includes other realization, wherein can not press shown or discuss suitable
Sequence, include according to involved function by it is basic simultaneously in the way of or in the opposite order, to execute function, this should be of the invention
Embodiment person of ordinary skill in the field understood.
It should be appreciated that each section of the present invention can be realized with hardware, software, firmware or combination thereof.Above-mentioned
In embodiment, software that multiple steps or method can in memory and by suitable instruction execution system be executed with storage
Or firmware is realized.It, and in another embodiment, can be under well known in the art for example, if realized with hardware
Any one of row technology or their combination are realized：With the logic gates for realizing logic function to data-signal
Discrete logic, with suitable combinational logic gate circuit application-specific integrated circuit, programmable gate array (PGA), scene
Programmable gate array (FPGA) etc..
Those skilled in the art are appreciated that realize all or part of step that above-described embodiment method carries
Suddenly it is that relevant hardware can be instructed to complete by program, the program can be stored in a kind of computer-readable storage medium
In matter, which includes the steps that one or a combination set of embodiment of the method when being executed.
In addition, each functional unit in each embodiment of the present invention can be integrated in a processing module, it can also
That each unit physically exists alone, can also two or more units be integrated in a module.Above-mentioned integrated mould
Block is both realized in the form of using hardware, can also be realized in the form of software function module.If the integrated module
It is realized in the form of software function module and when sold or used as an independent product, can also be stored in a computer can
It reads in storage medium.
Storage medium mentioned above can be read-only memory, disk or CD etc..
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is contained in one embodiment of the present of invention or example.In the present specification, schematic expression of the above terms are not necessarily
Refer to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be any one
It can be combined in any suitable manner in a or multiple embodiments or example.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art are not departing from the principle of the present invention and objective
In the case of can make changes, modifications, alterations, and variations to the above described embodiments within the scope of the invention.The scope of the present invention
By appended claims and its equivalent limit.
Claims (6)
1. a kind of test circuit, which is characterized in that the circuit includes the first power module, pressure drop module, reference voltage adjusting
Module, voltage comparison module, control module, the first break-make module, first voltage adjustment module and the second Voltage stabilizing module, wherein
First power module, for providing power supply；
The pressure drop module, including first end and second end, wherein the first end is electrically connected with first power module；
The reference voltage adjustment module, for exporting adjustable reference voltage by reference to voltage output end；
The voltage comparison module, including first input end, the second input terminal and comparison result output end, wherein described first
Input terminal is electrically connected with the second end of the pressure drop module, and second input terminal is electrically connected with the reference voltage output terminal；
The first voltage adjustment module, for exporting adjustable voltage by adjustable voltage output end；
Second Voltage stabilizing module, including voltage input end, output end of pressure-stabilizing and the second reference potential end, the voltage input end
It is electrically connected with the second end of the pressure drop module, second reference potential end is electrically connected with the adjustable voltage output end；
The control module, including trigger signal input terminal and first control signal output end, wherein the trigger signal input
End is electrically connected with the comparison result output end；
The control module, for sending conducting control letter to the break-make module by the first control signal output end
Number, it is additionally operable to after the trigger signal input terminal receives trigger signal, by the first control signal output end to institute
It states break-make module and sends disconnection control signal；
The break-make module, including the first connecting pin, second connection end and signal receiving end, wherein the signal receiving end with
The first control signal output end of the control module is electrically connected, the voltage stabilizing of first connecting pin and second Voltage stabilizing module
Output end is electrically connected, and the second connection end is electrically connected with electronic equipment to be measured；Described lead is received in the signal receiving end
When logical control signal, first connecting pin is connected with the second connection end；It is received in the signal receiving end described disconnected
When opening control signal, first connecting pin and the access of the second connection end disconnect.
2. circuit according to claim 1, which is characterized in that the reference voltage adjustment module, including second source mould
Block, the first reference voltage module, the first Voltage stabilizing module and the first variable resistance module, wherein
The first reference voltage module, including first power input and the first reference voltage output end, wherein described
First power input is electrically connected with the second power supply module, and the first reference voltage output end output voltage values are fixed
First reference voltage；
First Voltage stabilizing module, including the first reference potential end, adjustable end and the reference voltage output terminal, wherein described
First reference potential end is electrically connected with first reference voltage output end, for receiving first reference voltage, it is described can
It is a fixed value to adjust the voltage difference between end and first reference potential end；
The first variable resistance module, including the first fixing end, the second fixing end and the first sliding end, wherein described first
Fixing end is electrically connected with the reference voltage output terminal, and second fixing end is electrically connected with first reference potential end, institute
The first sliding end is stated to be electrically connected with the adjustable end；Resistance between first sliding end and first fixing end is adjustable.
3. circuit according to claim 2, which is characterized in that the reference voltage adjustment module further include first resistor and
Second resistance；
First fixing end is electrically connected with the reference voltage output terminal, including：First fixing end and first electricity
One end of resistance is electrically connected, and the other end of the first resistor is electrically connected with the reference voltage output terminal；
Second fixing end is electrically connected with first reference potential end, including：Second fixing end and second electricity
One end of resistance is electrically connected, and the other end of the second resistance is electrically connected with first reference potential end.
4. circuit according to any one of claims 1 to 3, which is characterized in that
The first voltage adjustment module includes third power module, the 4th power module, the second reference voltage module, third base
Quasi- voltage module, the second adjustable resistance module and third Voltage stabilizing module；Wherein,
The second reference voltage module, including second source input terminal and the second reference voltage output end, wherein described second
Power input is electrically connected with the third power module, the second reference voltage output end output voltage values fixed second
Reference voltage；
The third reference voltage module, including third power input and third reference voltage output end, wherein the third
Power input is electrically connected with the 4th power module, the fixed third of third reference voltage output end output voltage values
Reference voltage；
The second adjustable resistance module, including third fixing end, the 4th fixing end and the second sliding end, wherein the third
Fixing end is electrically connected with second reference voltage output end, the 4th fixing end and third reference voltage output end electricity
Connection, the resistance between second sliding end and the 4th fixing end is adjustable；
The third Voltage stabilizing module, including third reference potential end and the adjustable voltage output end, wherein the third reference
Potential end is electrically connected with second sliding end.
5. circuit according to claim 4, which is characterized in that
The first voltage adjustment module further includes 3rd resistor and the 4th resistance；
The third fixing end is electrically connected with second reference voltage output end, including：The third fixing end and described the
One end of three resistance is electrically connected, and the other end of the 3rd resistor is electrically connected with second reference voltage output end；
4th fixing end is electrically connected with the third reference voltage output end, including：4th fixing end and described the
One end of four resistance is electrically connected, and the other end of the 4th resistance is electrically connected with the third reference voltage output end.
6. circuit according to any one of claims 1 to 3, which is characterized in that
The control module further includes second control signal output end；
The circuit further includes discharge module, wherein the discharge module includes discharge control signal input terminal, signal to be discharged
Input terminal and ground terminal, the discharge control signal input terminal is electrically connected with the second control signal output end, described to wait putting
Electric signal input end is electrically connected with the second connection end, the ground terminal ground connection；The signal input part to be discharged is used for
After the discharge control signal input terminal receives discharge control signal, be connected with the ground terminal.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112327144A (en) * | 2021-01-04 | 2021-02-05 | 北京紫光青藤微系统有限公司 | Measurement circuit for measuring chip through IO pin |
| CN112327145A (en) * | 2021-01-04 | 2021-02-05 | 北京紫光青藤微系统有限公司 | Measurement circuit for measuring chip through IO pin |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108459218B (en) * | 2018-02-05 | 2021-05-14 | 天地融电子（天津）有限公司 | Test circuit |
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| CN108469582B (en) | 2020-09-08 |
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