CN113030608B - Power device flow equalizing characteristic evaluation experimental device - Google Patents
Power device flow equalizing characteristic evaluation experimental device Download PDFInfo
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- CN113030608B CN113030608B CN202110207863.6A CN202110207863A CN113030608B CN 113030608 B CN113030608 B CN 113030608B CN 202110207863 A CN202110207863 A CN 202110207863A CN 113030608 B CN113030608 B CN 113030608B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The invention discloses an experimental device for evaluating the current sharing characteristic of a power device, which comprises: the PCB board and the power device test circuit; an even number of power device sockets which are symmetrically distributed are arranged on the PCB; a plurality of tested power devices of a power circuit of the power device test circuit can be selectively inserted into a plurality of power device sockets in an even number of power device sockets, so that the power circuit can be symmetrically and asymmetrically arranged on a PCB (printed circuit board); according to the invention, through setting the even number of the power device sockets which are symmetrically distributed, the plurality of tested power devices can be selectively inserted into the plurality of power device sockets in the even number of the power device sockets, so that the power circuit can be symmetrically distributed and asymmetrically distributed on the PCB, and further, the research of influence of circuit arrangement asymmetry on the current sharing characteristic of the power devices and the comparison test of parameter consistency of different power devices in actual work are realized.
Description
Technical Field
The invention relates to the technical field of power device testing, in particular to a power device current sharing characteristic evaluation experimental device.
Background
Power semiconductor devices, i.e., Power Electronic devices, are high-Power (usually, currents of several tens to several thousands of amperes and voltages of several hundred volts or more) Electronic devices used in Power conversion and Power control circuits. The power semiconductor devices are classified into bipolar type and unipolar type power semiconductors according to the types of carriers, and may be classified into conventional silicon-based power semiconductor devices and wide bandgap material power semiconductor devices according to the types of materials.
With the increasing demand for power transmission, the product cost and the complexity of the driving circuit are greatly increased by simply using a single chip with high power level, so that the industrial demand is met by using multiple chips connected in parallel to increase the current rating. With the increase of the number of chips connected in parallel, many challenges are also provided for the research and development of power chips and the package integration technology, and one of the difficulties is the problem of parallel current sharing among a large number of chips in the device. Under the high-voltage high-power environment, when the parameters of the chips are not consistent or the circuit arrangement is asymmetric, the current distribution among the chips connected in parallel is not uniform, and in severe cases, the device fails or even the circuit is damaged. In general, chips in a device are selected from the same wafer as much as possible, or from the same production batch and the same production date, so that the parameters of the selected chips are as consistent as possible. However, even if the same batch of chips is selected, the actual parallel current sharing result may not meet the requirement.
The existing power device evaluation device mainly focuses on the characteristics of the device, reduces the loop inductance of a test circuit as much as possible, provides a relatively pure working environment for the power device, and focuses on how to quickly extract device parameters. The AMPEC off-line test platform can extract parameters of a power device, slightly changes software and hardware and can test the characteristics of a circuit system; various power device test platforms are developed at Zhejiang university, and switching dynamic waveforms of devices can be rapidly and accurately measured. Many power device testing platforms are also currently available in the commercial industry. However, the existing test platform focuses on studying parameters of a single power device, determines consistency of parameters of different power devices through parameter comparison, does not consider influence of circuit arrangement asymmetry on current sharing characteristics of the devices, and does not perform comparison test of consistency of parameters of different power devices in actual work.
Disclosure of Invention
The invention aims to provide a power device current sharing characteristic evaluation experimental device to realize the research of influence of circuit arrangement asymmetry on the current sharing characteristic of a power device and the comparison test of parameter consistency of different power devices in actual work.
In order to achieve the purpose, the invention provides the following scheme:
the invention provides a power device current sharing characteristic evaluation experimental device, which comprises: the PCB board and the power device test circuit; an even number of power device sockets are arranged on the PCB; the even number of power device sockets are sequentially distributed along the perpendicular line of the long edge of the PCB and are symmetrically distributed on two sides of the central axis of the long edge of the PCB;
the power device test circuit comprises a capacitor charge-discharge loop and a test circuit, and the test circuit comprises a drive circuit and a power circuit; two ends of a capacitor of the capacitor charging and discharging loop are respectively connected with the input end and the output end of the driving circuit;
the capacitor charging and discharging loop and the power circuit are arranged on the PCB;
the output end of the driving circuit is connected with the control end of the power circuit through a driving connecting terminal arranged on the PCB;
the power circuit to be tested is selectively inserted into a plurality of power device sockets in an even number of power device sockets, so that the power circuit can be symmetrically and asymmetrically arranged on the PCB;
a plurality of symmetrically distributed test terminals are arranged on the PCB.
Optionally, the capacitor charging and discharging loop comprises a direct-current power supply, a charging resistor, a rectifier diode, a remote-controllable IGBT, a discharging resistor and a capacitor;
one end of the capacitor is connected with the cathode of the rectifier diode, and the other end of the capacitor is connected with the cathode of the direct-current power supply; one end of the charging resistor is connected with the anode of the rectifying diode, and the other end of the charging resistor is connected with the anode of the direct-current power supply;
one end of the discharging resistor is connected with one end of the capacitor, and the other end of the discharging resistor is connected with the collector electrode of the remote-controllable IGBT; the emitting electrode of the remote-control IGBT is connected with the negative electrode of the direct-current power supply, and the grid electrode of the remote-control IGBT is connected with a remote controller in a wireless mode.
Optionally, the dc power supply is an adjustable dc power supply.
Optionally, the power circuit includes a plurality of power devices to be tested, a plurality of driving resistors, a freewheeling diode and a load inductor;
one end of the capacitor is connected with one end of the load inductor; one end of the load inductor is also connected with the cathode of the fly-wheel diode, and the other end of the load inductor is connected with the anode of the fly-wheel diode;
the collectors of the power devices to be tested are connected with the anodes of the freewheeling diodes; the grid electrodes of the tested power devices are respectively connected with one ends of the driving resistors in a one-to-one correspondence mode, and the other ends of the driving resistors are connected with the driving circuit through driving connecting terminals arranged on the PCB; the emitters of the tested power devices are connected with the other end of the capacitor;
the power device sockets are connected with the power device sockets in a one-to-one correspondence mode;
the freewheeling diode and the load inductor are positioned on the central axis of the long side of the PCB and are positioned on one side of the perpendicular line; the freewheeling diode and the load inductor are respectively welded on the front surface and the back surface of the PCB.
Optionally, the driving circuit includes a signal generator and an adjustable driving board;
the signal generator is connected with the adjustable driving plate;
the adjustable driving board is connected with the other ends of the driving resistors through driving connecting terminals arranged on the PCB;
the driving connecting terminal is positioned on the central axis of the PCB and positioned on the other side of the perpendicular line.
Optionally, the plurality of test terminals includes an even number of collector test terminals and an even number of gate test terminals;
the even number of collector test terminals and the even number of grid test terminals are respectively arranged in a preset range of the even number of power device sockets and are respectively connected with the collectors and the grids of the even number of power device sockets in a one-to-one correspondence mode.
Optionally, the plurality of test terminals further include a plurality of current test terminals, and the plurality of current test terminals are respectively disposed on two sides of a connection line between the emitter of the even number of power device sockets and the other end of the capacitor.
Optionally, the plurality of test terminals further include a plurality of voltage test terminals, and the plurality of voltage test terminals are distributed on a connection line between an emitter of an even number of the power device sockets and the other end of the capacitor.
Optionally, when the influence of the parameters of the power device to be tested on the parallel current sharing is studied, the number of the power device to be tested is two, and the two power devices to be tested are inserted into 2 symmetrically-distributed power device sockets in the even number of power device sockets.
Optionally, when the influence of the parameters of the driving circuit on the parallel current sharing is studied, the multiple measured power devices include two measured power devices with the same parameters, and the two measured power devices are respectively arranged on 2 asymmetrically-distributed power device sockets among an even number of power device sockets.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
the invention discloses an experimental device for evaluating the current sharing characteristic of a power device, which comprises: the PCB board and the power device test circuit; an even number of power device sockets are arranged on the PCB; the even number of power device sockets are sequentially distributed along the perpendicular line of the long edge of the PCB and are symmetrically distributed on two sides of the central axis of the long edge of the PCB; the power device test circuit comprises a capacitor charge-discharge loop and a test circuit, and the test circuit comprises a drive circuit and a power circuit; two ends of a capacitor of the capacitor charging and discharging loop are respectively connected with the input end and the output end of the driving circuit; the capacitor charging and discharging loop and the power circuit are arranged on the PCB; the output end of the driving circuit is connected with the control end of the power circuit through a driving connecting terminal arranged on the PCB; the power circuit to be tested is selectively inserted into a plurality of power device sockets in an even number of power device sockets, so that the power circuit can be symmetrically and asymmetrically arranged on the PCB; a plurality of symmetrically distributed test terminals are arranged on the PCB. According to the invention, through setting the even number of the power device sockets which are symmetrically distributed, the plurality of tested power devices can be selectively inserted into the plurality of power device sockets in the even number of the power device sockets, so that the power circuit can be symmetrically distributed and asymmetrically distributed on the PCB, and further, the research of influence of circuit arrangement asymmetry on the current sharing characteristic of the power devices and the comparison test of parameter consistency of different power devices in actual work are realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a schematic diagram of a power device test circuit provided by the present invention;
FIG. 2 is a diagram of a PCB package provided by the present invention;
fig. 3 is a model diagram of an experimental apparatus for evaluating current sharing characteristics of a power device according to the present invention;
fig. 4 is a schematic diagram of a test result of the experimental apparatus for evaluating current sharing characteristics of a power device provided in the present invention;
wherein 11-14 are 4 gate test terminals; 21-24 are 4 collector test terminals; 31-34 are 4 power device sockets; 4 is a rectifier diode (D1); 5 is a freewheeling diode (FRD); 61 is a charging resistor (R)1) (ii) a 62 is a discharge resistor (R)2) (ii) a 71-78 are 8 voltage test terminals; 81-86 are 6 current test terminals 1; 9 is a capacitor; and 10 is a remote-controlled IGBT.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a power device current sharing characteristic evaluation experimental device to realize the research of influence of circuit arrangement asymmetry on the current sharing characteristic of a power device and the comparison test of parameter consistency of different power devices in actual work.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
As shown in fig. 1 to 3, the present invention provides an experimental apparatus for evaluating current sharing characteristics of a power device, the experimental apparatus includes: the PCB board and the power device test circuit; an even number of power device sockets are arranged on the PCB; the even number of power device sockets are sequentially distributed along the perpendicular line of the long edge of the PCB and are symmetrically distributed on two sides of the central axis of the long edge of the PCB; the power device test circuit comprises a capacitor charge-discharge loop and a test circuit, and the test circuit comprises a drive circuit and a power circuit; two ends of a capacitor of the capacitor charging and discharging loop are respectively connected with the input end and the output end of the driving circuit; the capacitor charging and discharging loop and the power circuit are arranged on the PCB; the output end of the driving circuit is connected with the control end of the power circuit through a driving connecting terminal arranged on the PCB; the power circuit to be tested is selectively inserted into a plurality of power device sockets in an even number of power device sockets, so that the power circuit can be symmetrically and asymmetrically arranged on the PCB; a plurality of symmetrically distributed test terminals are arranged on the PCB.
The capacitor charging and discharging loop comprises a direct-current power supply, a charging resistor, a rectifier diode, a remote-controllable IGBT, a discharging resistor and a capacitor; one end of the capacitor is connected with the cathode of the rectifier diode, and the other end of the capacitor is connected with the cathode of the direct-current power supply; one end of the charging resistor is connected with the anode of the rectifying diode, and the other end of the charging resistor is connected with the anode of the direct-current power supply; one end of the discharging resistor is connected with one end of the capacitor, and the other end of the discharging resistor is connected with the collector electrode of the remote-controllable IGBT; the emitting electrode of the remote-control IGBT is connected with the negative electrode of the direct-current power supply, and the grid electrode of the remote-control IGBT is connected with a remote controller in a wireless mode. The direct current power supply is an adjustable direct current power supply.
The power circuit comprises a plurality of tested power devices, a plurality of driving resistors, a freewheeling diode and a load inductor; one end of the capacitor is connected with one end of the load inductor; one end of the load inductor is also connected with the cathode of the fly-wheel diode, and the other end of the load inductor is connected with the anode of the fly-wheel diode; the collectors of the power devices to be tested are connected with the anodes of the freewheeling diodes; the grid electrodes of the tested power devices are respectively connected with one ends of the driving resistors in a one-to-one correspondence mode, and the other ends of the driving resistors are connected with the driving circuit through driving connecting terminals arranged on the PCB; the emitters of the tested power devices are connected with the other end of the capacitor; the power device sockets are connected with the power device sockets in a one-to-one correspondence mode; the freewheeling diode and the load inductor are positioned on the central axis of the long side of the PCB and are positioned on one side of the perpendicular line; the freewheeling diode and the load inductor are respectively welded on the front surface and the back surface of the PCB.
The driving circuit comprises a signal generator and an adjustable driving plate; the signal generator is connected with the adjustable driving plate; the adjustable driving board is connected with the other ends of the driving resistors through driving connecting terminals arranged on the PCB; the driving connecting terminal is positioned on the central axis of the PCB and positioned on the other side of the perpendicular line.
The plurality of test terminals include an even number of collector test terminals and an even number of gate test terminals; the even number of collector test terminals and the even number of grid test terminals are respectively arranged in a preset range of the even number of power device sockets and are respectively connected with the collectors and the grids of the even number of power device sockets in a one-to-one correspondence mode.
The plurality of test terminals further comprise a plurality of current test terminals, and the plurality of current test terminals are respectively arranged on two sides of a connecting line between the emitter of the even number of power device sockets and the other end of the capacitor.
The plurality of test terminals further comprise a plurality of voltage test terminals, and the plurality of voltage test terminals are distributed on the connection line of the emitter of the even number of power device sockets and the other end of the capacitor.
When the influence of the parameters of the tested power device on the parallel current sharing is researched, the number of the tested power devices is two, and the two tested power devices are inserted into 2 symmetrically-distributed power device sockets in the even number of power device sockets. When the influence of the parameters of the driving circuit on the parallel current sharing is researched, the tested power devices comprise two tested power devices with the same parameters, and the two tested power devices are respectively arranged on 2 asymmetrically distributed power device sockets in an even number of power device sockets.
Specifically, fig. 1 is a schematic circuit diagram of a power device testing circuit provided by the present invention, and referring to fig. 1, the power device testing circuit of the power device current sharing characteristic evaluation experimental apparatus provided by the present invention includes two parts, namely a capacitor charging and discharging loop and a testing circuit. The capacitor charge-discharge circuit comprises: adjustable DC power supply VDCCharging resistor R1Discharge resistor R2Rectifier diode D1The IGBT and the capacitor C can be remotely controlled; the test circuit includes: load inductance LloadA free wheel diode FRD, 4 tested power devices DUT1-DUT4 (taking IGBT as an example in FIG. 1), and 4 driving resistors Rg1-Rg4And a signal generator V-pulse.
One end of the capacitor C and the rectifier diode D1Is connected with the cathode of the capacitor C, and the other end of the capacitor C is connected with an adjustable direct current power supply VDCThe negative electrode of (1) is connected; charging resistor R1And the rectifying diode D1Anode connection of, charging resistor R1The other end of the DC power supply VDCConnecting the positive electrode; discharge resistor R2One end of the resistor is connected with a capacitor C and a discharge resistor R2The other end of the gate is connected with a drain electrode of the remote-controllable IGBT; DC power supply VDCThe negative electrode of the IGBT is connected with the source electrode of the remote-controllable IGBT; one end of the capacitor C is connected with one end of the load inductor; load inductance LloadIs connected with the cathode of a freewheeling diode FRD, and a load inductor LloadThe other end of the diode is connected with the anode of a free-wheeling diode FRD; the drain electrode of the power device DUT1-DUT4 is connected with the anode electrode of the freewheeling diode FRD, and the gate electrode of the power device DUT1-DUT4 is connected with the driving resistor Rg1-Rg4Connecting, driving resistor Rg1-Rg4A source electrode of the power device under test DUT1-DUT4 connected with the signal generator V-pulse and the DC power supply VDCIs connected to the negative electrode of (1). The tested power device takes a tested TO packaging type power device as an example.
Fig. 2 is a schematic diagram of a PCB board of the device for measuring current sharing characteristics of a power device provided by the present invention, and fig. 3 is a schematic diagram of a model of the device for measuring current sharing characteristics of a power device provided by the present invention; as shown in fig. 2 and 3, the PCB board has 6 current test terminals 81-86), 8 voltage test terminals 71-78, and a current probe (rogowski coil) of the current measuring device is placed at the current test terminal of the PCB board for measuring the current flowing through the power device to be measured; the passive voltage probe of the voltage measuring device is arranged on a voltage testing terminal of the PCB and used for measuring the voltage of the power device to be measured.
The power device sockets are 4 in total, 31, 32, 33 and 34 in fig. 2 respectively, and 4 sockets are symmetrically distributed on two sides by taking a central line parallel TO the long edge of the PCB as an axis, are suitable for placing the TO-packaged power devices TO be tested, and can conveniently change the number and the positions of the TO-packaged power devices TO be tested. Gate test terminals (11, 12, 13, 14 in fig. 2) and collector test terminals (21, 22, 23, 24 in fig. 2) are provided at each power device socket, facilitating the measurement of the TO package type power device.
The 4 power device sockets are convenient for researching the influence of two factors of power device parameters and driving resistance on parallel current sharing. When the influence of device parameters on parallel current sharing is to be researched, the parallel connection of 31 and 34 or 32 and 33 is selected, so that the consistency of the parameters of the driving loops can be ensured; when the influence of the driving loop parameters on parallel current sharing is to be researched, under the condition that the device parameters are the same, the driving loop parameters are different by selecting 31 and 32 or 33 and 34 to be connected in parallel.
A freewheeling diode (FRD)5 provides a freewheeling loop for the current of the load inductor after the power device under test is turned off.
The one-time double-pulse experiment of the experimental device for evaluating the current sharing characteristic of the power device comprises two parts of experiment preparation and experiment implementation. The experimental preparation part is shown in figure 1, the IGBT is controlled to be turned off through remote control, and the direct-current power supply charges the capacitor. When the capacitor is charged, the power chip to be measured is in a turn-off state, so that only a charging loop, namely a loop formed by the direct current power supply, the charging resistor, the rectifying diode and the capacitor exists in a capacitor charging and discharging loop, and the voltage of the capacitor rapidly rises to the same voltage as the direct current power supply.
See FIG. 4 for experimental specific waveforms, where iCIs the current V flowing through the power device to be measuredGEIs the voltage between the gate and emitter of the power device under test, VCEThe control signal generator is used for realizing the on-off of the measured power device for the voltage between the collector and the emitter of the measured power device. At t0At the moment, the rising edge of the first driving pulse of the signal generator comes, the power device to be measured is conducted, the capacitor charges the load inductor at the moment, and the current passes through t0-t1Establishing current required by the characteristic test of the tested power device; at t1At the moment, the first driving signal of the signal generator disappears, the tested power device is turned off, and because the load inductance current can not change suddenly, the current flows from the tested power device to the anti-parallel freewheeling diode FRD; at t2At the moment, the second driving pulse of the signal generator comes, the tested power device is switched on again, the current flows to the tested power device from the free wheel diode FRD, and the current passes through t2-t3Time, DUT current continues to rise to t3And (6) at the moment, the tested power device is turned off again, and the double-pulse test experiment is ended. And simultaneously, the current probe and the voltage probe respectively measure the current flowing through the power device to be measured and the voltage drop on the power device to be measured.
The invention discloses a power device current sharing characteristic evaluation experimental device which comprises a PCB (printed circuit board), a direct-current power supply, a rectifier diode, a capacitor, a charging resistor, a discharging resistor, a remote-controllable IGBT (insulated gate bipolar translator) chip, a tested power device, an adjustable driving board, a power device socket, a signal generator, a load inductor, a freewheeling diode, a current measuring device, a voltage measuring device and a testing terminal. The experimental device uses the charge-discharge circuit capable of being controlled by the remote control IGBT to realize the charge-discharge of the capacitor, the test loop is based on a double-trigger pulse test circuit, a plurality of voltage test terminals and current test terminals are arranged on a PCB, four power device sockets are symmetrically arranged on the PCB and used for placing tested power devices, the current-sharing characteristic test of at most four chips in parallel can be realized by changing the distribution positions of the tested power devices, and the effect of simply and quickly analyzing the current-sharing characteristic of the power devices is achieved.
In addition, the charging voltage of the capacitor is controlled by the adjustable direct current power supply, the driving resistor is flexibly adjusted, and the working parameters of the power device to be measured under different voltage levels and different driving resistors can be conveniently obtained.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (8)
1. An experimental device for evaluating current sharing characteristics of a power device, the experimental device comprising:
the PCB board and the power device test circuit; an even number of power device sockets are arranged on the PCB; the even number of power device sockets are sequentially distributed along the perpendicular line of the long edge of the PCB and are symmetrically distributed on two sides of the central axis of the long edge of the PCB;
the power device test circuit comprises a capacitor charge-discharge loop and a test circuit, and the test circuit comprises a drive circuit and a power circuit; two ends of a capacitor of the capacitor charging and discharging loop are respectively connected with the input end and the output end of the driving circuit;
the capacitor charging and discharging loop and the power circuit are arranged on the PCB;
the output end of the driving circuit is connected with the control end of the power circuit through a driving connecting terminal arranged on the PCB;
the power circuit to be tested is selectively inserted into a plurality of power device sockets in an even number of power device sockets, so that the power circuit can be symmetrically and asymmetrically arranged on the PCB;
the PCB is provided with a plurality of symmetrically distributed test terminals;
when the influence of the parameters of the tested power devices on parallel current sharing is researched, the number of the tested power devices is two, and the two tested power devices are inserted into 2 symmetrically-distributed power device sockets in the even number of power device sockets;
when the influence of the parameters of the driving circuit on the parallel current sharing is researched, the tested power devices comprise two tested power devices with the same parameters, and the two tested power devices are respectively arranged on 2 asymmetrically distributed power device sockets in the even number of power device sockets.
2. The power device current sharing characteristic evaluation experimental device according to claim 1, wherein the capacitor charge-discharge loop comprises a direct current power supply, a charge resistor, a rectifier diode, a remote-controllable IGBT, a discharge resistor and a capacitor;
one end of the capacitor is connected with the cathode of the rectifier diode, and the other end of the capacitor is connected with the cathode of the direct-current power supply; one end of the charging resistor is connected with the anode of the rectifying diode, and the other end of the charging resistor is connected with the anode of the direct-current power supply;
one end of the discharging resistor is connected with one end of the capacitor, and the other end of the discharging resistor is connected with the collector electrode of the remote-controllable IGBT; the emitting electrode of the remote-control IGBT is connected with the negative electrode of the direct-current power supply, and the grid electrode of the remote-control IGBT is connected with a remote controller in a wireless mode.
3. The experimental apparatus for evaluating current sharing characteristics of power devices according to claim 2, wherein the dc power supply is an adjustable dc power supply.
4. The power device current sharing characteristic evaluation experimental device according to claim 1, wherein the power circuit comprises a plurality of tested power devices, a plurality of driving resistors, a freewheeling diode and a load inductor;
one end of the capacitor is connected with one end of the load inductor; one end of the load inductor is also connected with the cathode of the fly-wheel diode, and the other end of the load inductor is connected with the anode of the fly-wheel diode;
the collectors of the power devices to be tested are connected with the anodes of the freewheeling diodes; the grid electrodes of the tested power devices are respectively connected with one ends of the driving resistors in a one-to-one correspondence mode, and the other ends of the driving resistors are connected with the driving circuit through driving connecting terminals arranged on the PCB; the emitters of the tested power devices are connected with the other end of the capacitor;
the power device sockets are connected with the power device sockets in a one-to-one correspondence mode;
the freewheeling diode and the load inductor are positioned on the central axis of the long side of the PCB and are positioned on one side of the perpendicular line; the freewheeling diode and the load inductor are respectively welded on the front surface and the back surface of the PCB.
5. The experimental device for evaluating current sharing characteristics of power devices according to claim 4, wherein the driving circuit comprises a signal generator and an adjustable driving board;
the signal generator is connected with the adjustable driving plate;
the adjustable driving board is connected with the other ends of the driving resistors through driving connecting terminals arranged on the PCB;
the driving connecting terminal is positioned on the central axis of the PCB and positioned on the other side of the perpendicular line.
6. The power device current sharing characteristic evaluation experiment device according to claim 4, wherein the plurality of test terminals comprise an even number of collector test terminals and an even number of gate test terminals;
the even number of collector test terminals and the even number of grid test terminals are respectively arranged in a preset range of the even number of power device sockets and are respectively connected with the collectors and the grids of the even number of power device sockets in a one-to-one correspondence mode.
7. The power device current sharing characteristic evaluation experiment device according to claim 6, wherein the plurality of test terminals further include a plurality of current test terminals, and the plurality of current test terminals are respectively disposed on two sides of a connecting line between an emitter of an even number of power device sockets and the other end of the capacitor.
8. The power device current sharing characteristic evaluation experimental apparatus according to claim 6, wherein the plurality of test terminals further include a plurality of voltage test terminals, and the plurality of voltage test terminals are distributed on a connection line between an emitter of an even number of the power device sockets and the other end of the capacitor.
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