CN103701095B - A kind of test equipment protection circuit - Google Patents
A kind of test equipment protection circuit Download PDFInfo
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- CN103701095B CN103701095B CN201310694091.9A CN201310694091A CN103701095B CN 103701095 B CN103701095 B CN 103701095B CN 201310694091 A CN201310694091 A CN 201310694091A CN 103701095 B CN103701095 B CN 103701095B
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Abstract
The present invention provides a kind of test equipment protection circuit, to solve current test equipment and be devices under shortage to be effectively protected the technical problems such as measure.The test equipment protection circuit includes management and control circuit, hot plug protection circuit and ID Acquisition Circuit；Hot plug protection circuit described in equipment power supply Jing is connected with adapter, or described in Jing, hot plug protection circuit is directly connected with tested module in the case where adapter is not provided with；The management and control circuit include clamp circuit, comparison circuit, decoding circuit, gate circuit combination, triggers circuit and counting/timing circuit；The outfan of counting/timing circuit separates multiple signals respectively as corresponding switch controlling signal, feedback protection signal and driver/buffer/isolator control signal.The present invention can shield harmful effect of the extreme operating conditions to test equipment in real time, enable test equipment preferably to bear these extreme conditions.
Description
Technical field
The present invention relates to a kind of test equipment protection circuit, for ATE（ATE, Automatic Test
Equipment）Or to equipment itself, adapter in other test equipment courses of work（TUA, Test Unit Adapter,
ITA, Interface Test Adapter）And tested module（UUT, Unit Under Test）Protected.
Background technology
Test equipment is the core component of production line of batch, and its price is typically costly.In Design of Test System,
Protection to equipment and UUT is usually ignored.Most of test equipments are only capable of carrying out simply mistake in the course of the work at present
Stream, overvoltage protection, some are even wholly without protection.But the test equipment in modern times is frequently necessary to choosing in the face of mal-condition
War, these severe conditions often derive from user, UUT and external environment.Test equipment is often operated in overvoltage, excessively stream
And under hot conditionss.Many external factor Jing often occur these extreme cases.Such as, current anomaly（Including operator
Excessively stream that surge current, device failure or the circuit question that powered plug causes causes etc.）, power supply mistake（Including abnormity of power supply,
Module wrong plug causes plant-grid connection bus, device failure etc.）, high temperature（Equipment exceedes normal working temperature scope）Deng.More not
It is fortunately that, when various test equipments are actually used, test equipment often goes to test a UUT for having damaged.It is logical at present
Normal situation is, in Design of Test System, the protection to equipment and UUT is poorly efficient and unilateral, to various extreme work bars
Equipment protection under part has no effectively synthesis solution.
During design test system, if the probability worked under extreme conditions in view of equipment, effectively can increase
The mean free error time of test equipment（MTTF）.A kind of test equipment protection circuit according to the present invention can enable test equipment
It is enough preferably to bear these extreme conditions, so as to improve the long-term reliability of test equipment.
In field tests, when various test equipments are actually used, often it is operated in that voltage/current is abnormal, work people
Under the extreme conditions such as member's faulty operation, high temperature, the situation that equipment and UUT are damaged is caused to happen occasionally.At present typically,
In Design of Test System, the protection to equipment and UUT is poorly efficient and unilateral, and the equipment under various extreme operating conditions is prevented
Shield has no effectively synthesis solution.
Modern test equipment emphasizes versatility to minimize cost.As shown in fig. 6, the test system one of modernization
As include 3 major parts：Test equipment itself, adapter（TUA, Test Unit Adapter, ITA, Interface
Test Adapter）And tested module（UUT, Unit Under Test）.UUT protection circuits can be set in adapter（Referring to
The scheme of Chinese patent ZL200910254541.6）.In the case where equipment own resource meets requirement, this mode can allow
One test equipment meets the testing requirement of various different measured pieces by changing different adapters and test program.For example,
If equipment own resource meets the testing requirement of new UUT, it is not necessary to buy new equipment again, it is only necessary to set according to new demand
The new adapter of meter, changes corresponding software, it is possible to test new UUT.The cost of test is greatly lowered so.
Also test equipment and tested module are only included in having test system, there is no the situation of adapter.In some special surveys
In examination equipment, its test equipment only has a kind of measured piece（Or a small amount of several measured pieces）, it is direct that test equipment passes through electric interfaces
Connect with tested module, so avoiding the need for adapter.The test system adopted in this way is difficult to extend and upgrades.
The content of the invention
The present invention provides a kind of test equipment protection circuit, to solve current test equipment and be devices under lacking effective
The technical problem such as protective measure.
The present invention provides following basic solution：
A kind of test equipment protection circuit, including management and control circuit, hot plug protection circuit and No. ID collection electricity
Road；Hot plug protection circuit described in equipment power supply Jing is connected with adapter, or in the case where adapter is not provided with
Described in Jing, hot plug protection circuit is directly connected with tested module；
The management and control circuit include clamp circuit, comparison circuit, decoding circuit, gate circuit combination, triggers circuit
With counting/timing circuit；
Three inputs of the clamp circuit connect equipment power supply, safe voltage upper limit signal and safe voltage respectively
Low-limit signal, these three signals access comparison circuit, comparison circuit outut device power supply difference Jing after clamp circuit process
With the safe voltage upper limit and the comparative result of safe voltage low-limit signal；
The input of the decoding circuit is connected with the outfan of ID Acquisition Circuit；
The output signal of comparison circuit, the output signal of decoding circuit, heat alarm are connect as three class input signals
Enter the gate circuit combination, the outfan of gate circuit combination is connected to the input of triggers circuit, and triggers circuit output is asynchronous to put
The input of zero-signal to counting/timing circuit so that
When the input of gate circuit combination is all consistent with desired value, counting/timing circuit is not counted；Gate circuit combination
When any one or several inputs are not inconsistent with expection, triggers circuit activation counting/timing circuit is counted；
The outfan of counting/timing circuit separate multiple signals be respectively connected to hot plug protection circuit gate outfan,
Gate circuit combination and/or feedback protection end and the driving/buffering/isolation circuit of counting/timing circuit itself, respectively as
Corresponding switch controlling signal, feedback protection signal and driver/buffer/isolator control signal, wherein feedback protection
It is for producing rear defence abnormal that signal accesses the gate circuit combination and/or the feedback protection end of counting/timing circuit itself
Power supply is frequently switched on only；
The GATE signals of the gate outfan of the hot plug protection circuit also access the gate circuit combination, insert for heat
Forbid the management and control circuit work when pulling out protection circuit control on and off switch, prevent conflict situation；
The test equipment protection circuit is additionally provided with, and forbids input block output to forbid manually
Signal also accesses the gate circuit combination, for forbidding the test equipment protection circuit to work manually.
With regard to above-described clamp circuit and comparison circuit, it is contemplated that equipment power supply may provide various different volts
The voltage signal of value is used for adapter and tested module, if power supply provides only a kind of output signal of volt value, clamp
Circuit and comparison circuit are usually all the way, if power supply provides the power supply signal of various different volt values, clamp circuit
Multichannel is should be mutually with comparison circuit.Include one kind that equipment power supply is provided per the input of clamp circuit and comparison circuit all the way
Power supply signal and the corresponding safe voltage upper limit of this kind of power supply signal and safe voltage low-limit signal, a pair of level of final output
Signal.
Based on above-mentioned basic solution, the present invention also does following optimization and limits and improve：
Above-mentioned gate circuit combination is mainly by one or more OR circuits, an OR-NOT circuit and one and gate circuit group
Into；The output signal of the comparison circuit, the output signal of decoding circuit and heat alarm are used as nor gate electricity
The input signal on road；The output signal of the OR-NOT circuit, the feedback protection signal of counting/timing circuit output（The signal
It is identical with the GATE signals of gate output）, and forbid manually input block output disable signal as described and gate circuit
Input signal, the input that triggers circuit is connected to gate circuit output signal.
For the power supply signal of each volt value, the comparison circuit is provided with a pair of comparators, and this is to comparator point
Equipment power supply and the safe voltage upper limit, the comparison of safe voltage low-limit signal are not completed, this two to comparator is defeated
Go out the input as the OR gate in gate circuit combination.
Possibility described herein arranges multiple OR circuits, mainly believes in view of the power supply for various different volt values
Number, it is each to comparator（A kind of power supply signal of volt value of correspondence）An OR gate, the electricity of so various volt values can be respectively connected to
The multiple OR gates of source signal correspondence, multiple OR gates are respectively connected to nor gate again.Certainly, actually can also all comparators output
（The power supply signal of the various volt values of multigroup correspondence）An OR gate is all accessed, an output is re-formed and is accessed nor gate.
Above-mentioned ID Acquisition Circuit includes being connected between equipment power supply VCC and management and control circuit input
Pull-up resistor, arranges discrete magnitude information to recognize each adapter or tested module using pull-up resistor.
The number of above-mentioned pull-up resistor is corresponding with the number of tested module：If tested module only has one kind, pull-up electricity
Resistance is one, and the pull-up resistor is series between equipment power supply and the input of decoding circuit；If there is various tested modules,
Then pull-up resistor is multiple, and multiple pull-up resistors correspond to the multiple inputs for being series at equipment power supply and decoding circuit respectively
Between.
Above-mentioned hot plug protection circuit is with ADM4210, ADM1170, ADM1171, ADM1172, LTC4218, TPS2300
Or the hot-swapping controller of UCC2919 models is what core was constituted.
Compared with prior art, advantage is the present invention：
1st, the present invention in management and control circuit, hot plug protection circuit and ID Acquisition Circuit be combined into one it is whole
Body, shields various extreme operating conditions in real time（Over-pressed, under-voltage, current anomaly, high temperature and personnel's maloperation）To test equipment（Bag
Include test equipment itself, and TUA/ITA and UUT）Harmful effect, when effectively increasing the Mean of test equipment
Between, improve the reliability of safety during test equipment use and test equipment, extend the use longevity of test equipment
Life.
2nd, circuit of the present invention is practical succinct, and reliability is preferable；The cost of implementation of whole circuit is relatively low, has preferable economy
Property；In addition circuit implementing method flexibly, both can be realized using FPGAs such as FPGA, CPLD, it would however also be possible to employ trigger,
The discrete component such as enumerator and gate circuit is realized.
Description of the drawings
Fig. 1 is the test equipment protection circuit theory diagram of the present invention；
Fig. 2 is the hot plug protection circuit schematic diagram of model ADM4210；
Fig. 3 is the hot plug protection circuit schematic diagram of model LTC4218：
Fig. 4 is ID Acquisition Circuit schematic diagrams.
Fig. 5 is the logic schematic diagram of one embodiment of the present of invention.
Fig. 6 is each component annexation schematic diagram of test equipment.
Specific embodiment
As shown in figure 1, the test equipment protection circuit of the present invention include management and control circuit, hot plug protection circuit with
And ID Acquisition Circuit；Wherein hot plug protection circuit and ID Acquisition Circuit by management and control circuit electrical connection, by managing
Reason and control circuit the function synthesized of each several part circuit is got up, formed one have automatic data collection, judgement, processing function it is whole
Body.
Management and control circuit include clamp circuit, comparison circuit, decoding circuit, gate circuit combination, triggers circuit and meter
Number/timing circuit；Three of clamp circuit inputs respectively with equipment power supply, the safe voltage upper limit and safe voltage under
Limit signal connection, these three signals are connected with comparison circuit Jing after clamp circuit process, comparison circuit outut device power supply
Respectively with the safe voltage upper limit and the comparative result of safe voltage low-limit signal.The input of the decoding circuit and No. ID collection electricity
Road connects；One input of the gate circuit combination is connected with the output of comparison circuit, an input is connected with ID Acquisition Circuit
Connect, another input is connected with heat alarm；The outfan of the gate circuit combination is used as data input and triggers circuit
It is connected；Clock signal is input into the gate circuit combination, triggers circuit and counting/timing circuit simultaneously；The triggers circuit it is defeated
Go out and be connected with the input of counting/timing circuit as asynchronous zero setting signal；When the gate circuit combination input all with expection
When value is consistent（Normally）, counting/timing circuit do not count；When gate circuit combination any one or several inputs with it is expected
When not being inconsistent（It is abnormal）, triggers circuit activation counting/timing circuit, start counting up；When counting reaches preset value, the counting/
Timing circuit output switch control signal, driver/isolator control signal and feedback protection signal；Switch controlling signal passes through
Not gate is connected with hot plug protection circuit, for controlling on and off switch；Driver/isolator control signal is selected for control sheet
（CS, Chip Select）, enable（OE, Output Enable）Deng signal, can be with various drivers, isolator, relay
It is connected, makes management and control circuit that other classes such as number bus, emulation bus can also be protected in addition to protecting supply line
The signal line of type；Feedback protection signal unrolls and accesses aforementioned gate circuit combination, for after abnormal generation entering protection circuit
Enter waiting state, prevent from frequently switching on power supply.ID Acquisition Circuit and hot plug protection circuit are existed by management and control circuit
Functionally it is integrated into a whole.The grid gate output GATE signals of hot-swapping controller access aforementioned gate circuit combination, use
Forbid management and control circuit when hot-swapping controller controls on and off switch, prevent conflict situation.Additionally, there is one to prohibit manually
Stop signal accesses gate circuit combination, for when necessary（Maintenance, fix a breakdown when）The circuit is forbidden to work.
ID Acquisition Circuit includes the electricity of the input for being connected to equipment power supply VCC and management and control circuit
Resistance, is coordinated with management and control circuit and realizes automatic defect preventing installation, be ensure that between adapter, UUT and test equipment
Secure match.
Resistance is one or more, and the number of the resistance is corresponding with the number of tested module UUT；When UUT only has one
When planting, resistance is one, and the resistance is series between equipment power supply and management and the input of control circuit；Work as UUT
When having various, resistance be it is multiple, the resistance be connected to equipment power supply and management and control circuit and its corresponding to
Between input.
Hot plug control circuit be with ADM4210, ADM1170, ADM1171, ADM1172, LTC4218, TPS2300 or
The hot-swapping controller of the models such as UCC2919 is what core was constituted, it is possible to achieve the safe hot plug between UUT and test equipment.
Referring to Fig. 2, the hot plug protection circuit includes that model is the hot-swapping controller of ADM4210, the first partial pressure electricity
Resistance R1, the second divider resistance R2, inductive reactance R3, first resistor R4, second resistance R5, timer capacitor C1, filter capacitor C2, electricity
Hold C3, load filter capacitor C4 and N-channel power field effect pipe N-MOSFET；The energization input Vcc of the hot-swapping controller
Pin connects equipment power supply VCC；The enable of the hot-swapping controller and the input ON pins that reset pass through the first divider resistance
R1 is grounded, and connects VCC by the second divider resistance R2；And ON pins are connected with filter capacitor C2 earth terminals by resistance R1
Connect, ON pins connect VCC ends by resistance R2 and filter capacitor C2 and are connected, constitute RC filter circuits；The hot-swapping controller is determined
When setting input TIMER pins be grounded by timer capacitor C1；The GND pins ground connection of the hot-swapping controller；The hot plug control
The load current sensing SENSE pins of device processed are connected with the drain D end of power MOSFET, power supply Vsys（Vsys both can for UUT and
Adapter is powered, also dependent on needing to power for the other instruments in test equipment, equipment or subsystem）With power MOSFET's
Source S end connects, and SENSE pins are connected with the energization input VCC pins of the hot-swapping controller by inductive reactance R3
Connect；The grid gate output GATE pins of the hot-swapping controller are by first resistor R4 and N-channel power field effect pipe N-
The grid G end connection of MOSFET, and the second resistance R5 and electric capacity C3 ground connection by connecting；UUT power supplies Vsys is by negative
Carry filter capacitor C4 ground connection.
Referring to Fig. 3, the hot plug protection circuit include the hot-swapping controller of model LTC4218, first resistor R1,
First divider resistance R2, the second divider resistance R3, the 3rd divider resistance R4, inductive reactance R5, second resistance R6,3rd resistor
R7, the 4th resistance R8, the 5th resistance R9, the 6th resistance R10, timer capacitor C1, electric capacity C2, load filter capacitor C3, decoupling electricity
Hold C4 and N-channel power field effect pipe N-MOSFET；The model of hot-swapping controller is LTC4218, running voltage 2.9-
26.5V；The supply input VDD pin connection equipment power supply VCC of the hot-swapping controller；The power supply of the hot-swapping controller
Good instruction input PG pins connect VCC by first resistor R1；The hot-swapping controller it is under-voltage compare input UV pins with
Excessively stream indicates that FLT pins are directly connected to, and connects VCC by the first divider resistance R2；The overvoltage of the hot-swapping controller is compared
Input OV pins are grounded by the 3rd divider resistance R4；Second divider resistance R3 is connected between R2 and R4；The hot plug is controlled
The timing setting input TIMER pins of device are grounded by timer capacitor C1；The builtin voltage output of the hot-swapping controller
INTVCC pins are grounded by decoupling capacitor C4；The GND pins ground connection of the hot-swapping controller；The electric current of the hot-swapping controller
Sensing anode SENSE+ pins are connected with VCC, and the electric current of the hot-swapping controller senses negative terminal SENSE- pins and power
The drain D end of MOSFET connects, and inductive reactance R5 is series between SENSE+ and SENSE-；Power supply Vsys and power
The source S end connection of MOSFET；The source S connection end SOURCE pins of the hot-swapping controller and the source S of power MOSFET
End connection；The grid gate output GATE pins of the hot-swapping controller are by 3rd resistor R7 and N-channel power field effect pipe
The grid G end connection of N-MOSFET, and the 4th resistance R8 and electric capacity C2 ground connection by connecting；The electric current of the hot-swapping controller
Monitor output IMON pins are grounded by second resistance R6；The electric current of the hot-swapping controller is turned back well more defeated with power supply
Enter FB pins and UUT power supply Vsys are connected by the 5th resistance R9, and be grounded by the 6th resistance R10；UUT power supplies
Vsys is by loading filter capacitor C3 ground connection.
The model of hot-swapping controller is not limited only to ADM4210（Running voltage 2.7-16.5V）And LTC4218（Work electricity
Pressure 2.9-26.5V）, can also be ADM1170（Running voltage 1.6-16.5V）、ADM1171（Running voltage 2.7-16.5V）、
ADM1172（Running voltage 2.7-16.5V）、TPS2300（Running voltage 3-13V）Or UCC2919（Running voltage 3-8V）Deng
The hot-swapping controller of model, is also capable of achieving the+3.3V/+5V hot plug protection circuits of UUT.Such as need to isolate and manage various electricity
Pressure, can be with by the way of being controlled using every kind of voltage respectively or from the hot-swapping controller with multivoltage management function.Heat is inserted
Pulling out the specific connected mode of control circuit can need adjustment according to which, and can also use includes enumerator, comparator and gate circuit etc.
The circuit that discrete component is constituted replaces hot-swapping controller.
Under normal circumstances, when powered circuit board is extracted from the base plate for working, on circuit board, shunt capacitance will
Low impedance path by being now likely to form on circuit board is produced larger transient current by electric discharge, discharge current, and this is larger
Transient current is referred to as surge.It makes base plate power supply occur instantaneously falling, so as to cause working condition mistake, even more serious meeting to lead
Cause the damage of the parts such as adapter, component, the metal connecting line of circuit board or device.By an external N-channel power field
Effect pipe（N-MOSFET）With other peripheral cells, coordinate certain control strategy eliminate surge current, realize UUT and survey
The safe hot plug of examination equipment room.The peripheral cell is exactly resistance needed for circuit, electric capacity, enumerator or comparator
Deng.Due to circuit being constituted using discrete component and small scale integration, have the shortcomings that reliability is low, maintenance cost is high, and adopt
Hot-swapping controller realize then having small volume, lightweight, circuit structure it is simple, with higher safety, reliability and compared with
The advantages of low holistic cost, it is therefore proposed that realizing the UUT protection devices from hot-swapping controller outer meeting resistance, condenser network
Hot plug protection circuit.
Referring to Fig. 4, ID Acquisition Circuit is to identify different UUT by using pull-up resistor circuit setting discrete magnitude information
Circuit realiration.Including being connected on equipment power supply VCC and manage and control circuit（Referred to as：Management and control circuit）Input
Pull-up resistor.The number of the pull-up resistor is corresponding with the number of tested module UUT, and the resistance can be one can also be
Multiple, when UUT is only a kind of, resistance is one, is the input for being serially connected with power supply VCC and management and control circuit；When UUT has various
When resistance for multiple, be the input for being connected to power supply VCC and management and control circuit corresponding to which.When tested, UUT and test equipment
After correct connection, in multiple resistance is ground connection with that resistance corresponding to current tested module.
Generally, if UUT wrong plug groove positions in test, UUT and test equipment and adapter power supply circuits be will result in not
Matching, it is possible to can cause to damage to UUT and test equipment.This circuit solution is, the discrete on adapter and UUT
Amount identification signal, i.e., No. ID.No. ID is corresponded with every kind of UUT.As tested module a, tested module b, tested module c it is discrete
Amount ID is 110,101,011 respectively.ID0 is in UUT（Tested module a）After adapter and the correct physical connection of test equipment
Can be connected with a ground pin on tested module a（In the same manner ID1, ID2 after correctly connecting with test equipment also respectively with quilt
The ground pin surveyed in module b, c is connected）, so when module a is correctly accessed, the discrete magnitude state of ID0, ID1, ID2
It is respectively low, high, high（I.e. No. ID is 110）, thus can acquisition module a it is corresponding No. ID（That is discrete magnitude identification information）.Surveying
In examination equipment running process, manage and this discrete magnitude identification information of control circuit meeting real-time judgment, when discrete magnitude identification information
When reading wrong, management and control circuit can be cut off UUT in real time and power, and test system is provided also dependent on management and control circuit
The state of switch controlling signal proceed to exception handles, falsely drop so as to be automatically prevented from UUT or TUA/ITA, to test equipment
Play a protective role.
Referring to Fig. 5, the management and control circuit include decoder, the first toggle switch, the first Schottky diode,
Two Schottky diodes, first comparator, the second comparator, gate circuit combination（Mainly constitute by OR gate, nor gate and with door）、
Second toggle switch, d type flip flop, enumerator, the first not gate and the second not gate；The input of the decoder and No. ID collection electricity
Road connects；One input of the ID Acquisition Circuit can be connect with UUT after UUT and test equipment correctly connect
Ground pin is connected；3 outfans 011,101 and 110 of the decoder one-to-one company with one end of the first toggle switch respectively
Connect；The other end of the toggle switch all links together, and is connected with an input of the nor gate；Described
The negative electrode attachment security upper voltage limit datum of one Schottky diode, anode connection equipment power supply；Second Xiao
The negative electrode connection equipment power supply of special based diode, anode attachment security lower voltage limit datum；The first comparator
Positive input terminal connection equipment power supply, negative input end attachment security upper voltage limit level；Second comparator it is just defeated
Enter to hold attachment security lower voltage limit level, negative input end connection equipment power supply；The input of the OR gate connects respectively
The outfan of one comparator and the second comparator；The outfan of the OR gate is connected with another input of the nor gate；
The outfan of the nor gate is connected with an input of door with described；Described another input and described second with door
Wherein 2 toggle switch connections of toggle switch, the other end of this 2 switches are driven high respectively and drag down；It is described another with door
One input is connected with the GATE outfans of hot-swapping controller；It is described to be connected with the data input pin D pins of d type flip flop；
The input end of clock C pin input clock pulse signals of the d type flip flop, while the clock pulse signal is used as counting clock
The counting input end CLK of input enumerator；Draw high at the preset input PR ends of the d type flip flop；The clearing input of the d type flip flop
CLR ends are connected with reset signal RESET of system；The outfan Q of the d type flip flop and the asynchronous zero setting input of enumerator
RST is connected；The number of putting of the enumerator is input into PE pins, input of energizing（CET and CEP）Pin is drawn high, preset input P0 to P3
Can drag down or need to arrange according to timing；The outfan Q3 of the enumerator accesses hot-swapping controller by the first not gate
GATE pins, while being unrolled by the second not gate accesses energizing for enumerator（CEP or CET）Pin；The output of the enumerator
End Q3 accesses bus driver/transceiver as enable signal OE；The outfan Q3 cut-in relays switch of the enumerator is made
For switch controlling signal.The circuit suggestion is realized using CPLD or FPGA, to improve reliability.
Referring to Fig. 5, No. ID, heat alarm, voltage monitoring signal all Jing OR gates and with door input trigger, No. ID,
Any one abnormal signal of temperature, voltage all can trigger test equipment protection circuit in real time.
Referring to Fig. 5, the connected mode 3-8 decoder can provide 3 ID positions, when the quantity of UUT or TUA/ITA exceedes
8, when needing more ID, the model of replaceable decoder, such as 4-10 decoders etc..When tested module a is tested, it is assumed that
No. ID during correct connection is 110, then stir 110 corresponding switches, turn on S1, connects Y6 and nor gate.When module a and survey
After the correct physical connection of examination equipment, ID0 can be connected with a ground pin in module a, and ID0 is drop-down for low level, and now
ID1, ID2 are still pulled up as high level by Vsys.When so correctly connecting, corresponding ID discrete magnitudes information is 110.In the same manner, quilt
When surveying the test of module b, after module b and test equipment correct physical connection, ID1 can be with module b a ground pin phase
Even, ID1 is drop-down for low level, and now ID0, ID2 are still high level by Vsys pull-up.Corresponding No. ID when so correctly connecting
Discrete magnitude information is 101.101 corresponding switches are stirred, turns on S1, connect Y6 and nor gate.When tested module c is tested,
After module c and test equipment correct physical connection, ID2 can be connected with a ground pin in module c, and ID2 is drop-down for low
Level, and now ID0, ID1 are still pulled up as high level by Vsys.When so correctly connecting, corresponding ID discrete magnitudes information is
011,011 corresponding switch is stirred, turns on S1, connect Y6 and nor gate.
The switch conduction of the second toggle switch correspondence pull-up referring to Fig. 5, when test equipment is used, is stirred, taboo manually is made
Only Hold signal is driven high, now test equipment protection circuit normal work；Need repairing or go out when test equipment appearance is abnormal
When existing other situations need shielding protection circuit, the drop-down switch conduction of the second toggle switch correspondence is stirred, makes to forbid manually
Hold signal is pulled low, and now test equipment protection circuit quits work.
Referring to Fig. 5, the power supply Jing clamp diodes difference safe voltage upper limit of equipment and safe voltage low-limit signal
Connection, is clamped to power supply output in the negative voltage range of positive voltage and a safety of one safety first.Then will
The power supply of equipment is compared with the safe voltage upper limit and safe voltage low-limit signal, if voltage is within the normal range, electricity
Pressure monitoring signal Vcc_Monitor output low level, if voltage exceeds normal range, voltage monitoring signal Vcc_
Monitor exports high level.Voltage monitoring signal Vcc_Monitor as control signal input once OR gate and with door be input into
Trigger.
Referring to Fig. 5, No. ID, heat alarm, voltage monitoring signal all Jing OR gates input and door, with door output with one
D type flip flop is connected, and the output of d type flip flop is connected with the asynchronous zero setting input RST of one 42 system coincidence counters, control
Enumerator keeps reset cleared condition（Normally）Or enter count status（It is abnormal）.Clock pulse signal CLK is both as d type flip flop
Clock input, also serve as the counting clock input of enumerator, frequency can be arranged according to actual needs.When test equipment protection electricity
When the signal of road monitoring is normal（No. ID is that desired value, temperature are not reported to the police, voltage is within the normal range）, d type flip flop data are defeated
The low level for entering D is delivered to Q output on the just edge of clock, forms a low level signal and enumerator is maintained at reset clearing
State, this hour counter disregard number, and the state of Gate signals is determined by hot-swapping controller（Gate signals control N-channel power
The on off operating mode of field effect transistor N-MOSFET, N-MOSFET control power supply Vsys）；When test equipment protection circuit monitoring it is any
When one signal occurs abnormal, the high level of d type flip flop data input D is delivered to Q output on the just edge of clock, and enumerator is opened
Begin to count, meter is full n time（N can be arranged according to actual needs, and this example is 8）Afterwards Gate signals are drawn as low level, N-channel power field
Effect pipe N-MOSFET disconnects, and cut off the electricity supply Vsys, while stopping rolling counters forward, makes enumerator enter hold mode；Now
Hot-swapping controller does not work.Hot-swapping controller is by external inductive reactance monitor in real time UUT, adapter or miscellaneous equipment
Electric current, when its electric current, voltage are normal, the state of Gate signals is by the state for managing the input signal monitored with control circuit
Determine.When hot-swapping controller detect current/voltage burr, surge, short circuit, overvoltage/under-voltage etc. it is abnormal when, management and control
Circuit does not work, and hot-swapping controller directly determines the state of Gate signals according to own hardware logic.Abnormal conditions are once
Occur, hot-swapping controller immediately enters current-limit mode and powers, if current limliting time delay expires（Time delay determined by timing capacitor,
Can arrange according to actual needs）Abnormal to eliminate not yet, then it is low level to draw Gate signals, disconnects N-MOSFET, cuts off the electricity supply
Vsys.The now Gate signal-inhibitings unrolled by management and control circuit, do not work.The model of hot-swapping controller can basis
It is actually needed selection.In figure, VCC is equipment power supply, and Vsys is UUT, adapter, other instruments/equipment/subsystem are powered
Power supply, clock pulse signals of the CLK for control logic, RESET are management and control circuit reset signal, and Gate is control N-
The gate-control signal of MOSFET break-makes.
The present invention can shield various extreme operating conditions in real time（Over-pressed, under-voltage, current anomaly, high temperature and personnel grasp by mistake
Make）To test equipment（Including test equipment itself, and adapter and UUT）Harmful effect, effectively increase test equipment
Mean free error time, improve safety and reliability during test equipment use, extend making for test equipment
Use the life-span.
Claims (6)
1. a kind of test equipment protection circuit, it is characterised in that：Including management and control circuit, hot plug protection circuit and ID
Number Acquisition Circuit；Hot plug protection circuit described in equipment power supply Jing is connected with adapter, or is being not provided with adapter
In the case of hot plug protection circuit described in Jing be directly connected with tested module；
The management and control circuit include clamp circuit, comparison circuit, decoding circuit, gate circuit combination, triggers circuit and meter
Number/timing circuit；
Three inputs of the clamp circuit connect equipment power supply, safe voltage upper limit signal and safe voltage lower limit respectively
Signal, these three signals access comparison circuit Jing after clamp circuit process, comparison circuit outut device power supply respectively with peace
The comparative result of the full voltage upper limit and safe voltage low-limit signal；
The input of the decoding circuit is connected with the outfan of ID Acquisition Circuit；
The output signal of comparison circuit, the output signal of decoding circuit, heat alarm access institute as three class input signals
Gate circuit combination is stated, the outfan of gate circuit combination is connected to the input of triggers circuit, and triggers circuit exports asynchronous zero setting letter
Number to counting/timing circuit input so that
When the input of gate circuit combination is all consistent with desired value, counting/timing circuit is not counted；It is any that gate circuit is combined
When one or several inputs are not inconsistent with expection, triggers circuit activation counting/timing circuit is counted；
The outfan of counting/timing circuit separates multiple signals and is respectively connected to the gate outfan of hot plug protection circuit, door electricity
Road combination and/or feedback protection end and the driving/buffering/isolation circuit of counting/timing circuit itself, respectively as corresponding
Switch controlling signal, feedback protection signal and driver/buffer/isolator control signal, wherein feedback protection signal
The feedback protection end for accessing the gate circuit combination and/or counting/timing circuit itself is for preventing frequency after abnormal generation
Numerous Switching Power Supply；
The GATE signals of the gate outfan of the hot plug protection circuit also access the gate circuit combination, protect for hot plug
Forbid the management and control circuit work during protection circuit control on and off switch, prevent conflict situation；
The test equipment protection circuit is additionally provided with, and forbids input block output disable signal manually
Also the gate circuit combination is accessed, for forbidding the test equipment protection circuit to work manually.
2. test equipment protection circuit according to claim 1, it is characterised in that：The gate circuit is combined mainly by one
Or multiple OR circuits, an OR-NOT circuit and one are constituted with gate circuit；The output signal of the comparison circuit, decoding
Input signal of the output signal and heat alarm of circuit as the OR-NOT circuit；The OR-NOT circuit
Feedback protection signal and forbid the disable signal of input block output to make manually that output signal, counting/timing circuit is exported
For described and gate circuit input signal, the input that triggers circuit is connected to gate circuit output signal.
3. test equipment protection circuit according to claim 2, it is characterised in that：
For the power supply signal of each volt value, the comparison circuit are provided with a pair of comparators, this has been distinguished to comparator
Forming apparatus power supply and the safe voltage upper limit, the comparison of safe voltage low-limit signal, this two output to comparator are made
For the input of the OR gate in gate circuit combination.
4. according to the arbitrary described test equipment protection circuit of claims 1 to 3, it is characterised in that：The ID Acquisition Circuit
Including the pull-up resistor being connected between equipment power supply VCC and management and control circuit input, set using pull-up resistor
Put discrete magnitude information to recognize each adapter or tested module.
5. test equipment protection circuit according to claim 4, it is characterised in that：The number of the pull-up resistor with it is tested
The number of module is corresponding：If tested module only one of which, pull-up resistor is one, and the pull-up resistor is series at equipment and powers
Between power supply and the input of decoding circuit；If there is multiple tested modules, pull-up resistor is multiple, multiple pull-up resistor difference
Correspondence is series between equipment power supply and multiple inputs of decoding circuit.
6. test equipment protection circuit according to claim 5, it is characterised in that：The hot plug protection circuit be with
The hot-swapping controller of ADM4210, ADM1170, ADM1171, ADM1172, LTC4218, TPS2300 or UCC2919 model
Constitute for core.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310694091.9A CN103701095B (en) | 2013-12-16 | 2013-12-16 | A kind of test equipment protection circuit |
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| CN201310694091.9A CN103701095B (en) | 2013-12-16 | 2013-12-16 | A kind of test equipment protection circuit |
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| CN103701095A CN103701095A (en) | 2014-04-02 |
| CN103701095B true CN103701095B (en) | 2017-03-29 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105717378B (en) * | 2014-12-01 | 2018-09-21 | 中国航空工业集团公司第六三一研究所 | A kind of ATE dynamic power managements method |
| CN107045849B (en) * | 2017-02-20 | 2020-09-04 | 昆山龙腾光电股份有限公司 | Time sequence control device and method and display device |
| CN109100671B (en) * | 2018-07-05 | 2021-06-22 | 北京华峰测控技术股份有限公司 | Monitoring method and monitoring system for testing system in integrated circuit electronic component testing |
| CN113156221A (en) * | 2021-03-26 | 2021-07-23 | 上海上大鼎正软件股份有限公司 | Monitoring device and monitoring system based on electromagnetic leakage |
| CN113363955B (en) * | 2021-05-30 | 2024-08-30 | 西北工业大学 | Hot plug interface circuit of CAN bus measurement and control module |
| CN118297011B (en) * | 2024-06-06 | 2024-09-13 | 天水天光半导体有限责任公司 | Simulation optimization method of D trigger and D trigger |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101764403A (en) * | 2009-12-28 | 2010-06-30 | 中国航空工业集团公司第六三一研究所 | UUT protective circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US8255707B2 (en) * | 2008-03-06 | 2012-08-28 | Fujitsu Limited | System and method for providing a one-step testing architecture |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101764403A (en) * | 2009-12-28 | 2010-06-30 | 中国航空工业集团公司第六三一研究所 | UUT protective circuit |
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| Title |
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| PCB自动测试通用适配器设计技术;许斌等;《宇航计测技术》;20051031;第25卷(第5期);55-58 * |
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