CN207488440U - Pulse generating circuit and power tube test device - Google Patents

Pulse generating circuit and power tube test device Download PDF

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Publication number
CN207488440U
CN207488440U CN201721667299.1U CN201721667299U CN207488440U CN 207488440 U CN207488440 U CN 207488440U CN 201721667299 U CN201721667299 U CN 201721667299U CN 207488440 U CN207488440 U CN 207488440U
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China
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circuit
pulse
master controller
signal
power
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CN201721667299.1U
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江雪晨
冯宇翔
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Midea Group Co Ltd
GD Midea Air Conditioning Equipment Co Ltd
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Midea Group Co Ltd
Guangdong Midea Refrigeration Equipment Co Ltd
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Abstract

The utility model discloses a kind of pulse generating circuit and power tube test device, the pulse generating circuit includes key control circuit, master controller and power driving circuit, master controller has pulse signal output end mouth and I/O mouthfuls multiple, multiple push button signalling output terminals of multiple I/O mouthfuls and key control circuit connect one to one, the input terminal of pulse signal output end mouth and power driving circuit connects, and the output terminal of power driving circuit and the controlled end of power tube connect;Wherein, key control circuit receives key command input by user, and the corresponding push button signalling of key command is exported, so that master controller is according to the push button signalling received, it exports corresponding pulse signal and carrys out the work of driving power pipe, realize the parameter testing to power tube;The type of pulse signal includes at least single pulse signal, dipulse signal, continuous impulse signal.The utility model, which solves impulse generator, can only fix output dipulse signal, the problem of can not being in due course adjusted according to test case.

Description

Pulse generating circuit and power tube test device
Technical field
The utility model is related to electronic circuit technology field, more particularly to a kind of pulse generating circuit and power tube test dress It puts.
Background technology
IGBT is widely used in motor variable-frequency speed-regulating, high-performance electric as a kind of high power semi-conductor device for power switching The fields such as source and industrial electric automation, have wide market.In order to optimize the design of IGBT device, how accurately to test Parameters during IGBT practical applications become particularly significant, wherein, parameter test method is to export arteries and veins using impulse generator Control IGBT is brought, then every test is realized by test circuit or test device etc..
At present, IGBT tests are mostly based on what dipulse measuring technology designed with impulse generator, and this generator can only Fixed output dipulse signal, in due course can not be adjusted pulse according to test case, function is limited.
Utility model content
The main purpose of the utility model is to propose a kind of pulse generating circuit and power tube test device, it is intended to solve arteries and veins Output dipulse signal can only be fixed by rushing generator, pulse can not be adjusted in due course according to test case, function is limited Problem.
To achieve the above object, the utility model proposes a kind of pulse generating circuit, applied in power tube test device, The pulse generating circuit includes key control circuit, master controller and power driving circuit, and the master controller has pulse Signal output port and I/O mouthfuls multiple, multiple described I/O mouthfuls with multiple push button signalling output terminals one of the key control circuit One is correspondingly connected with, and the pulse signal output end mouth is connect with the input terminal of the power driving circuit, the power drive electricity The output terminal on road and the controlled end of power tube connect;Wherein,
The key control circuit for receiving key command input by user, and is pressed the key command is corresponding Key signals are exported to the master controller;
The master controller, for according to the push button signalling received, exporting corresponding pulse signal, the pulse The type of signal includes at least single pulse signal, dipulse signal, continuous impulse signal;
The power driving circuit, for by the pulse signal be amplified processing after output to the power tube by End is controlled, the power tube to be driven to work, realizes the parameter testing to the power tube.
Preferably, the key control circuit include for set the pulse signal type type setting button branch Road tunes up button branch and for reducing the pulse width and/or institute for increase width between pulse width and/or pulse That states width between pulse turns button branch, the start button branch for triggering the master controller output pulse signal, institute down It states type setting button branch, described tune up button branch, the output for turning button branch and the start button branch down End connects one to one with the multiple described I/O mouthfuls.
Preferably, the type setting button branch, described tune up button branch, described turn button branch down and described open Dynamic button branch includes a key switch and a pull-up resistor, and the first end of each pull-up resistor accesses the first direct current Source, the output terminal of the second end of each pull-up resistor respectively with corresponding key switch are connect;Each button The input terminal of switch is grounded.
Preferably, the power driving circuit includes driving chip, adjustable resistor, the first capacitance and leading-out terminal, institute The input terminal for stating driving chip is the input terminal of the power driving circuit, the output terminal of the driving chip and the adjustable electric Hinder the first end connection of device, the power end of the driving chip first end with the second DC power supply and first capacitance respectively Interconnection;The ground terminal of the driving chip and the second end of first capacitance are grounded;The common end of the adjustable resistor It is connected through the controlled end of the leading-out terminal and power tube.
Preferably, pulse generating circuit further include be used to implement the master controller and the power driving circuit signal every From signal isolation circuit, the signal isolation circuit be arranged in series pulse signal output end in the master controller with it is described Between the input terminal of power driving circuit.
Preferably, the signal isolation circuit includes optocoupler and first resistor, the input terminal of the optocoupler and the master control The pulse signal output end connection of device processed, the input terminal and described first of the output terminal of the optocoupler and the power driving circuit The first end interconnection of resistance;First power end of the optocoupler is connect with the first DC power supply;The second source end of the optocoupler It is connect with third DC power supply, with the master controller altogether, the second of the optocoupler is grounded the first ground terminal of the optocoupler End and the driving chip are altogether.
Preferably, the pulse generating circuit further includes current foldback circuit, the test side of the current foldback circuit with The output terminal connection of the power tube, the output terminal of the current foldback circuit and the over-current detection port of the master controller connect It connects;
The current foldback circuit is used to detect the over-current signal of the power tube, and output overcurrent detection signal, so that The master controller controls the power tube to work according to the over-current detection signal.
Preferably, the current foldback circuit include comparator and with door, the normal phase input end of the comparator is for connecing Enter reference voltage, the inverting input of the comparator is the test side of the current foldback circuit, the output of the comparator End is connect with described with the first input end of door, described to be exported with the second input terminal of door and the status signal of the master controller End connection, the output terminal with door are the output terminal of the current foldback circuit.
Preferably, the pulse generating circuit further includes display circuit, the input terminal of the display circuit and the master control Device connection processed;The master controller is additionally operable to according to the push button signalling, and the display circuit is controlled to work.
The utility model also proposes a kind of power tube test device, including pulse generating circuit as described above;The arteries and veins Punching occurs circuit and includes key control circuit, master controller and power driving circuit, and the master controller is defeated with pulse signal Exit port and I/O mouthfuls multiple, multiple push button signalling output terminals of multiple described I/O mouthfuls and the key control circuit correspond Connection, the pulse signal output end mouth connect with the input terminal of the power driving circuit, the power driving circuit it is defeated The controlled end of outlet and power tube connects;Wherein, the key control circuit, for receiving key command input by user, and The corresponding push button signalling of the key command is exported to the master controller;The master controller receives for basis The push button signalling exports corresponding pulse signal, and the type of the pulse signal includes at least single pulse signal, dipulse is believed Number, continuous impulse signal;The power driving circuit, for output after the pulse signal is amplified processing to the work( The controlled end of rate pipe the power tube to be driven to work, realizes the parameter testing to the power tube.
The utility model pulse generating circuit is by setting the key control circuit to refer to receive button input by user It enables, and the corresponding push button signalling of the key command is exported to the master controller, so that master controller is according to receiving The push button signalling exports a kind of pulse signal in single pulse signal, dipulse signal, continuous impulse signal;And pass through work( Rate driving circuit is exported after the pulse signal is amplified processing to the controlled end of the power tube, to drive the power Pipe works, and realizes the parameter testing to the power tube.The utility model, which solves impulse generator, can only fix the double arteries and veins of output Signal is rushed, pulse can not be adjusted in due course according to test case, the problem of function is limited.
Description of the drawings
It in order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only It is some embodiments of the utility model, for those of ordinary skill in the art, in the premise not made the creative labor Under, other attached drawings can also be obtained according to the structure shown in these attached drawings.
Fig. 1 is the function module signal that the utility model pulse generating circuit is applied to one embodiment of power tube test device Figure;
Fig. 2 is the electrical block diagram of one embodiment of key control circuit in Fig. 1 pulse generating circuits;
Fig. 3 is the electrical block diagram of one embodiment of the utility model pulse generating circuit.
Drawing reference numeral explanation:
Label Title Label Title
10 Key control circuit U1 Driving chip
11 Type setting button branch U2 Optocoupler
12 Tune up button branch U3 Comparator
13 Turn button branch down U4 With door
14 Start button branch VCC1 First DC power supply
20 Master controller VCC2 Second DC power supply
30 Power driving circuit VCC3 Third DC power supply
40 Signal isolation circuit C1 First capacitance C1
50 Current foldback circuit VR1 Adjustable resistor
TC1 Leading-out terminal R1 First resistor
The embodiments will be further described with reference to the accompanying drawings for the realization, functional characteristics and advantage of the utility model aim.
Specific embodiment
The following is a combination of the drawings in the embodiments of the present utility model, and the technical scheme in the embodiment of the utility model is carried out It clearly and completely describes, it is clear that described embodiment is only the part of the embodiment rather than whole of the utility model Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not making creative work premise Lower all other embodiments obtained, shall fall within the protection scope of the present invention.
If it is to be appreciated that related in the utility model embodiment directionality instruction (such as upper and lower, left and right, it is preceding, Afterwards ...), then directionality instruction be only used for explain it is opposite between each component under a certain particular pose (as shown in drawings) Position relationship, motion conditions etc., if the particular pose changes, directionality instruction also correspondingly changes correspondingly.
It if, should " first ", " the in addition, relate to the description of " first ", " second " etc. in the utility model embodiment Two " etc. description is only used for description purpose, and it is not intended that instruction or implying its relative importance or implicit indicating meaning The quantity of the technical characteristic shown." first " is defined as a result, the feature of " second " can express or implicitly include at least one A this feature.In addition, the technical solution between each embodiment can be combined with each other, but must be with ordinary skill Personnel can be implemented as basis, and this technical side is will be understood that when the combination appearance of technical solution is conflicting or can not realize The combination of case is not present, also not within the protection domain of the requires of the utility model.
The utility model proposes a kind of pulse generating circuit, applied in power tube test device.
As the high-power semiconductor switch such as IGBT, field-effect tube, thyristor device is in motor variable-frequency speed-regulating, high-performance electric The extensive use in the fields such as source and industrial electric automation, especially IGBT, since it is fast with switching speed, conduction voltage drop is low Etc. characteristics, used by more and more electrical equipments, therefore, how to optimize the design of IGBT device, also become it is more and more important Research topic.Every ginsengs such as shutdown leakage current, trigger current, trigger voltage during accurate test IGBT power tube practical applications Number also becomes more and more important, tests these parameters, more effective method is pulse method.At present, test pulse generation Device is mostly based on the design of dipulse measuring technology, and this generator can only fix output dipulse signal, can not be according to test Situation is in due course adjusted pulse, and function is limited.
Referring to figs. 1 to Fig. 3, in one embodiment of the utility model, the pulse generating circuit include key control circuit 10, Master controller 20 and power driving circuit 30, the master controller 20 has pulse signal output end mouth and I/O mouthfuls multiple, multiple Multiple push button signalling output terminals of described I/O mouthfuls and the key control circuit 10 connect one to one, and the pulse signal is defeated Exit port is connect with the input terminal of the power driving circuit 30, the output terminal of the power driving circuit 30 and power tube by Control end connection;Wherein,
The key control circuit 10, for receiving key command input by user, and the key command is corresponding Push button signalling is exported to the master controller 20;
The master controller 20 for the push button signalling received in basis, exports corresponding pulse signal, described The type of pulse signal includes at least single pulse signal, dipulse signal, continuous impulse signal;
The power driving circuit 30, for output after the pulse signal is amplified processing to the power tube Controlled end the power tube to be driven to work, realizes the parameter testing to the power tube.
In the present embodiment, power tube can be with IGBT, field-effect tube, thyristor etc., and the present embodiment is said by taking IGBT as an example It is bright.Master controller 20 can be the integrated control chip that DSP, FPGA, microcontroller etc. can realize output of pulse signal, this implementation Example is preferably realized using microcontroller, and timer is integrated in microcontroller, is generated using the Interruption of timer corresponding Pulse signal.It is understood that memory, data processor are also integrated in microcontroller and is stored in the memory Software program and/or module upper and can be run on the data processor, are stored in by running or performing in memory Software program and/or module, according to key control circuit 10 export push button signalling and call be stored in memory Data realize the output of pulse signal.
Key control circuit 10 receives key command input by user, and key command is converted to corresponding button and is believed Number, so that master controller 20 exports the pulse signal of respective type according to the push button signalling.For example, master controller 20 can basis Within a certain period of time, the user detected pushes button the number of button in control circuit 10, to generate corresponding pulse signal, It can specifically be presented as:When detecting user by next time, master controller 20 then generates single pulse signal and exports, when detecting use Family is pressed twice, and master controller 20 then generates dipulse signal and exports, when detecting that user presses three times, master controller 20 It then generates continuous impulse signal and exports.
Alternatively, master controller 20 can also detect the duration that user pushes button button in control circuit 10, to generate phase The pulse signal answered can be specifically presented as:A length of 1-5s when detecting that user pushes button, master controller 20 then generate simple venation It rushes signal and exports, a length of 8-10s when detecting that user pushes button, master controller 20 then generates dipulse signal and defeated Go out, a length of 12-14s when detecting that user pushes button, master controller 20 then generates continuous impulse signal and exports.Certainly, The present embodiment is not limited to judge the type of pulse signal by detecting touch potential and button duration, specifically can be according to reality Situation and use habit are set, and are not limited herein.
The pulse amplitude of 20 output pulse signal of master controller is generally 5V, and because its internal resistance is bigger so bringing onto load energy Power is very low, and the driving voltage of IGBT is mostly 10~35V, in order to improve the driving force to power tube, power driving circuit 30 the pulse signal that master controller 20 exports is amplified after output to the controlled end of power tube namely the grid of IGBT, with Driving power pipe works.
The utility model pulse generating circuit receives button input by user by setting the key control circuit 10 Instruction, and the corresponding push button signalling of the key command is exported to the master controller 20, so that master controller 20 is according to connecing The push button signalling received exports a kind of pulse signal in single pulse signal, dipulse signal, continuous impulse signal;And The pulse signal is amplified after processing by power driving circuit 30 and is exported to the controlled end of the power tube, with driving The power tube work, realizes the parameter testing to the power tube.The utility model solves impulse generator and can only fix The problem of output dipulse signal, in due course can not be adjusted pulse according to test case, and function is limited.
Referring to figs. 1 to Fig. 3, further, the key control circuit 10 includes the class for setting the pulse signal The type setting button branch 11 of type, for increasing tuning up button branch 12 and being used for for width between pulse width and/or pulse Reduce width between the pulse width and/or the pulse turns button branch 13, defeated for triggering the master controller 20 down Go out the start button branch 14 of pulse signal, the type setting button branch 11 described tune up button branch 12, described turns down The output terminal of button branch 13 and the start button branch 14 connects one to one with the multiple described I/O mouthfuls.
In the present embodiment, type setting button branch 11 is correspondingly arranged pulse according to key command input by user, output The type push button signalling of type, in the key command of 11 accessing user of type setting button branch input, and output is pressed accordingly After key type.It tunes up button branch 12/ to turn down under setting of the button branch 13 based on type setting button branch 11, according to user The key command of input, width and/or pulse width between increase/reduction pulse.Hereafter, start button branch 14 is defeated according to user The key command entered, export start button signal, with trigger master controller 20 according to type setting button branch 11, tune up/adjust The push button signalling that small button branch 13 is set, exports corresponding pulse signal.
Referring to figs. 1 to Fig. 3, further, the type setting button branch 11, the button branch 12, described of tuning up It turns button branch 13 and the start button branch 14 down and includes a key switch and a pull-up resistor, each pull-up resistor First end access the first DC power supply VCC1, the second end of each pull-up resistor respectively with corresponding button The output terminal connection of switch;The input terminal of each key switch is grounded.
In the present embodiment, key switch corresponding types setting button branch 11 described tune up button branch 12, described turns down 14 4 branches of button branch 13 and the start button branch, the quantity of setting for four and respectively button K1, K2, K3 and K4, the quantity of corresponding pull-up resistor setting is also four, and respectively resistance R11, R12, R13 and R14.Pull-up resistor is used for When button K1, K2, K3 and K4 are not pressed, the level of 20 each I/O mouthfuls of master controller is pulled up, in button K1, K2, K3 and When K4 is pressed, low level push button signalling can be exported to 20 each I/O mouthfuls of master controller, and trigger master controller 20 and work.
Specifically, button K1, K2, K3 and K4 are respectively defined as type set key " SET ", plus key " UP ", subtract key " DOWN " and start key " RUN ".By pressing Types Below set key " SET " setting signal type, the wherein type of pulse signal extremely Include pulse, dipulse and continuous impulse less, certainly in the program module in master controller 20, each corresponding signal type The width parameter of acquiescence is both provided with, if at this point, user does not carry out next step button operation, master controller 20, which is in, " to be waited for Send out signal condition ";Type set key " SET " is continued through, master controller 20 is made to be in " pulse-width regulated state ", it at this time can be with By plus key " UP " or subtract width between key " DOWN " adjustment pulsewidth and pulse;After adjusting pulsewidth, then by pressing Types Below setting Key " SET " makes master controller 20 be restored to " waiting sends out signal condition ";Under " waiting sends out signal condition ", start key is pressed " RUN ", the outputs such as width between pulse signal type, pulse width and pulse that master controller 20 is set according to more than button operation Go out corresponding pulse signal.
Referring to figs. 1 to Fig. 3, in a preferred embodiment, the power driving circuit 30 includes driving chip U1, adjustable electric The input terminal for hindering device VR1, the first capacitance C1 and leading-out terminal TC1, the driving chip U1 is the power driving circuit 30 Input terminal, the output terminal of the driving chip U1 are connect with the first end of the adjustable resistor VR1, the driving chip U1's Power end interconnects respectively with the first end of the second DC power supply VCC1 and the first capacitance C1;The ground connection of the driving chip U1 The second end with the first capacitance C1 is held to be grounded;The common end of the adjustable resistor VR1 through the leading-out terminal TC1 with The controlled end connection of power tube.
In the present embodiment, driving chip U1 is used to after the pulse signal of input is amplified processing export to adjustable resistance One end of device VR1.Slidingtype rheostat may be used to realize in adjustable resistor VR1, can also using rotary rheostat come It realizes, the present embodiment is preferably slidingtype rheostat, and the other end of adjustable resistor VR1 is hanging, public contact and tested IGBT Grid connection, so as to adjust the output to the rising edge arrival time of IGBT grid impulse signals, it is to be understood that adjustable The resistance value of resistor VR1 is bigger, and the rising edge arrival time exported to IGBT grid impulse signals is then slower;Adjustable resistor The resistance value of VR1 is smaller, and the rising edge arrival time exported to IGBT grid impulse signals is then faster.
Referring to figs. 1 to Fig. 3, in a preferred embodiment, pulse generating circuit, which further includes, is used to implement the master controller 20 are arranged in series with the signal isolation circuit 40 of 30 signal isolation of power driving circuit, the signal isolation circuit 40 in institute It states between the pulse signal output end of master controller 20 and the input terminal of the power driving circuit 30.
In the present embodiment, 40 user of signal isolation circuit realizes that master controller 20 is exported to the pulse of power driving circuit 30 Signal unidirectionally exports, and is scurried into avoid the interference signal of power side by power driving circuit 30 to master controller 20, and influences Master controller 20 works normally.
Referring to figs. 1 to Fig. 3 further, the signal isolation circuit 40 includes optocoupler U2 and first resistor R1, the light The input terminal of coupling U2 is connect with the pulse signal output end of the master controller 20, output terminal and the power of the optocoupler U2 The first end of the input terminal of driving circuit 30 and the first resistor R1 interconnect;The first power end of the optocoupler U2 and first is directly The VCC1 connections of galvanic electricity source;The second source end of the optocoupler U2 is connect with third DC power supply VCC3, and the first of the optocoupler U2 With the master controller 20 altogether, the second ground terminal of the optocoupler U2 and the driving chip U1 are altogether for ground terminal.
In the present embodiment, using the unidirectional transmission property of optocoupler U2, the pulse signal that master controller 20 is exported is through optocoupler U2 is exported after carrying out signal isolation, and certainly in other embodiments, signal isolation circuit 40 can also use other one-way conductions Element is realized, is not herein limited.
Referring to figs. 1 to Fig. 3, in a preferred embodiment, the pulse generating circuit further includes current foldback circuit 50, institute The test side for stating current foldback circuit 50 is connect with the output terminal of the power tube, the output terminal of the current foldback circuit 50 with The over-current detection port connection of the master controller 20;
The current foldback circuit 50 is used to detect the over-current signal of the power tube, and output overcurrent detection signal, with The master controller 20 is made the power tube to be controlled to work according to the over-current detection signal.
In the present embodiment, in order to avoid causing to burn when the electric current for flowing through power tube is excessive when reasons because power tube is short-circuited Measured power pipe, the present embodiment detect the output current of power tube, and the electric current that will be detected by current foldback circuit 50 Output is to the over-current detection port of master controller 20 after signal is converted to voltage signal corresponding with current signal size, so that main Controller 20 controls power tube to work according to the over-current detection signal received.
Further, the current foldback circuit 50 include comparator U3 and with door U4, the positive of the comparator U3 is defeated Enter end for accessing reference voltage Vref, the inverting input Vc of the comparator U3 is the inspection of the current foldback circuit 50 End is surveyed, the output terminal of the comparator U3 is connect with the first input end with door U4, second input terminal with door U4 It is connect with the status signal output of the master controller 20, the output terminal with door U4 is the current foldback circuit 50 Output terminal.
In the present embodiment, the sampled circuit of inverting input of comparator U3 and the emitter of IGBT connect, sample circuit Tested IGBT emitter currents are converted into voltage signal, when the voltage signal is more than the reference of comparator U3 normal phase input ends During voltage, the output terminal of comparator U3 exports high level to the input terminal with door U4.In IGBT conducting states, master controller The level of 20 status signal output be high level, at this time with the level of another input terminal of door U4 also for height, thus with door U4 outputs are logic 1, and it is high level to represent logical signal z, which feeds back to the over-current detection port of master controller 20. When receiving high logical signal z, the counter being integrated in master controller 20 starts timing, when logical signal z maintains high electricity The flat time is more than the overcurrent protection time of setting, then judges that IGBT is operated in risk status, then the output phase should for master controller 20 Pulse signal, to control tested IGBT shutdowns, realize IGBT overcurrent protections.
Referring to figs. 1 to Fig. 3, based on above-described embodiment, the pulse generating circuit still further comprises display circuit, and (figure is not Show), the input terminal of the display circuit is connect with the master controller 20;The master controller 20 be additionally operable to according to it is described by Key signals control the display circuit to work.
In the present embodiment, the display devices such as LED display, LCD liquid crystal display screen may be used to realize in display circuit, main The push button signalling that controller 20 is inputted according to button controller circuit, exports corresponding display drive signals, with driving display electricity Road works, and so as to the current user's operation state of real-time display, by display circuit, user can intuitively obtain current etc. Signal condition to be sent out, pulse-width regulated status signal type and width parameter.
The utility model also proposes a kind of power tube test device, and the power tube test device includes arteries and veins as described above Circuit occurs for punching.The detailed construction of the pulse generating circuit can refer to above-described embodiment, and details are not described herein again;It is appreciated that It is, due to having used above-mentioned pulse generating circuit in the utility model power tube test device, the utility model power The embodiment of pipe test device includes whole technical solutions of above-mentioned pulse generating circuit whole embodiments, and the technology reached Effect is also identical, and details are not described herein.
The above is only the preferred embodiment of the present invention, and it does not limit the scope of the patent of the present invention, Under every utility model in the utility model is conceived, equivalent structure made based on the specification and figures of the utility model Transformation or directly/be used in other related technical areas indirectly and be included in the scope of patent protection of the utility model.

Claims (10)

1. a kind of pulse generating circuit, applied in power tube test device, which is characterized in that the pulse generating circuit includes Key control circuit, master controller and power driving circuit, the master controller have pulse signal output end mouth and multiple I/O Mouthful, multiple push button signalling output terminals of multiple described I/O mouthful and the key control circuit connect one to one, and the pulse is believed Number output port is connect with the input terminal of the power driving circuit, the output terminal of the power driving circuit and power tube by Control end connection;Wherein,
The key control circuit for receiving key command input by user, and the corresponding button of the key command is believed Number output is to the master controller;
The master controller, for according to the push button signalling received, exporting corresponding pulse signal, the pulse signal Type include at least single pulse signal, dipulse signal, continuous impulse signal;
The power driving circuit, it is controlled to the power tube for output after the pulse signal is amplified processing The parameter testing to the power tube the power tube to be driven to work, is realized in end.
2. pulse generating circuit as described in claim 1, which is characterized in that the key control circuit is included for setting It states the type setting button branch of the type of pulse signal, tune up button for increase width between pulse width and/or pulse Branch and turn button branch down, for reduce width between the pulse width and/or the pulse for triggering the master control The start button branch of device output pulse signal processed, the type setting button branch described tune up button branch, described turn down The output terminal of button branch and the start button branch connects one to one with the multiple described I/O mouthfuls.
3. pulse generating circuit as claimed in claim 2, which is characterized in that the type setting button branch described tunes up Button branch, button branch and the start button branch turned down include a key switch and a pull-up resistor, each institute The first end for stating pull-up resistor accesses the first DC power supply, the second end of each pull-up resistor respectively with corresponding institute State the output terminal connection of key switch;The input terminal of each key switch is grounded.
4. pulse generating circuit as described in claim 1, which is characterized in that the power driving circuit include driving chip, Adjustable resistor, the first capacitance and leading-out terminal, the input terminal of the driving chip are the input terminal of the power driving circuit, The output terminal of the driving chip is connect with the first end of the adjustable resistor, and the power end of the driving chip is respectively with The first end of two DC power supplies and first capacitance interconnects;The ground terminal of the driving chip and the second of first capacitance End is grounded;The common end of the adjustable resistor is connected through the controlled end of the leading-out terminal and power tube.
5. pulse generating circuit as claimed in claim 4, which is characterized in that pulse generating circuit further include be used to implement it is described Master controller and the signal isolation circuit of the power driving circuit signal isolation, the signal isolation circuit are arranged in series in institute It states between the pulse signal output end of master controller and the input terminal of the power driving circuit.
6. pulse generating circuit as claimed in claim 5, which is characterized in that the signal isolation circuit includes optocoupler and first Resistance, the input terminal of the optocoupler are connect with the pulse signal output end of the master controller, the output terminal of the optocoupler and institute State the input terminal of power driving circuit and the first end interconnection of the first resistor;First power end of the optocoupler and first is directly Galvanic electricity source connects;The second source end of the optocoupler is connect with third DC power supply, the first ground terminal of the optocoupler with it is described Altogether, the second ground terminal and the driving chip of the optocoupler are altogether for master controller.
7. pulse generating circuit as described in claim 1, which is characterized in that the pulse generating circuit further includes overcurrent protection Circuit, the test side of the current foldback circuit are connect with the output terminal of the power tube, the output of the current foldback circuit End is connect with the over-current detection port of the master controller;
The current foldback circuit is used to detect the over-current signal of the power tube, and output overcurrent detection signal, so that described Master controller controls the power tube to work according to the over-current detection signal.
8. pulse generating circuit as claimed in claim 7, which is characterized in that the current foldback circuit include comparator and with Door, the normal phase input end of the comparator for accessing reference voltage, for the overcurrent protect by the inverting input of the comparator The test side of protection circuit, the output terminal of the comparator are connect with described with the first input end of door, described second defeated with door Enter end to connect with the status signal output of the master controller, the output terminal with door is the defeated of the current foldback circuit Outlet.
9. the pulse generating circuit as described in claim 1 to 8 any one, which is characterized in that the pulse generating circuit is also Including display circuit, the input terminal of the display circuit is connect with the master controller;The master controller is additionally operable to according to institute Push button signalling is stated, the display circuit is controlled to work.
10. a kind of power tube test device, which is characterized in that including the pulse generation as described in claim 1 to 9 any one Circuit.
CN201721667299.1U 2017-12-04 2017-12-04 Pulse generating circuit and power tube test device Active CN207488440U (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108776313A (en) * 2018-06-15 2018-11-09 广东美的制冷设备有限公司 Dynamic characteristic test circuit and IPM test devices
CN109839581A (en) * 2019-03-21 2019-06-04 王举贵 A kind of semiconductor device testing apparatus and system
CN111426927A (en) * 2018-12-24 2020-07-17 东南大学 Dynamic electrical stress applying device and testing method for power semiconductor device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108776313A (en) * 2018-06-15 2018-11-09 广东美的制冷设备有限公司 Dynamic characteristic test circuit and IPM test devices
CN111426927A (en) * 2018-12-24 2020-07-17 东南大学 Dynamic electrical stress applying device and testing method for power semiconductor device
CN111426927B (en) * 2018-12-24 2022-06-21 东南大学 Dynamic electrical stress applying device and testing method for power semiconductor device
CN109839581A (en) * 2019-03-21 2019-06-04 王举贵 A kind of semiconductor device testing apparatus and system

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