CN117434358A - Dynamic characteristic test circuit and method for T-shaped three-level converter unit - Google Patents

Dynamic characteristic test circuit and method for T-shaped three-level converter unit Download PDF

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Publication number
CN117434358A
CN117434358A CN202210837340.4A CN202210837340A CN117434358A CN 117434358 A CN117434358 A CN 117434358A CN 202210837340 A CN202210837340 A CN 202210837340A CN 117434358 A CN117434358 A CN 117434358A
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China
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power device
capacitor
diode
inductor
current
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Chinese (zh)
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丁继
唐开锋
马荣耀
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China Resources Microelectronics Chongqing Ltd
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China Resources Microelectronics Chongqing Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/26—Testing of individual semiconductor devices
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/26—Testing of individual semiconductor devices
    • G01R31/2601—Apparatus or methods therefor
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/26—Testing of individual semiconductor devices
    • G01R31/2607—Circuits therefor
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/26—Testing of individual semiconductor devices
    • G01R31/2607—Circuits therefor
    • G01R31/2632—Circuits therefor for testing diodes

Abstract

The invention provides a dynamic characteristic test circuit and method of a T-shaped three-level converter unit, comprising the following steps: a charge-discharge control unit for providing a charge current or a discharge path for the first and second capacitors; a series connection of a first capacitor and the second capacitor; the T-shaped three-level converter unit adjusts the current flow direction and the output level through a switch time sequence; and the first end of the inductor is connected with the voltage output end of the T-shaped three-level converter unit, and the second end of the inductor is connected with the connecting nodes of the first capacitor and the second capacitor. The test circuit has the advantages of simple structure, high efficiency and comprehensive functions, and is convenient for realizing automatic test; different working conditions can be tested without switching the inductance position in the same circuit, and the operation is convenient; the consistency of the circuit is prevented from being changed due to the switching of the inductance position, and the test accuracy is high; when the inductor enters the follow current, the voltage at the two ends of the inductor is 0V, so that the actual application working condition is reduced, and the test accuracy is further improved; overcurrent protection is adopted to avoid damaging devices or circuits when the current is excessive.

Description

Dynamic characteristic test circuit and method for T-shaped three-level converter unit
Technical Field
The invention relates to the field of integrated circuit testing, in particular to a dynamic characteristic testing circuit and method of a T-shaped three-level converter unit.
Background
The power device is widely applied in different application fields, so that a designer needs to design the dynamic characteristics of the power device according to the characteristics of different application fields so as to better meet different requirements, and the application personnel needs to design different peripheral circuits according to the dynamic characteristics of the power device so as to enable the power device to work in an optimal state. For a converter unit formed by power devices in bridge type application, the dynamic characteristics of the devices can be tested through a double-pulse circuit; however, the working conditions of the converter unit formed by the power devices in the T-shaped three-level are different from those of the bridge type application, and the conventional double-pulse circuit cannot be directly adopted for testing, so that a new circuit is required to be designed for testing the dynamic characteristics of the T-shaped three-level converter unit.
In the prior art, different test circuits are designed aiming at different working states of T-shaped three levels, the switching of the test circuits is realized by switching the inductance positions in the test process, and the test process is relatively complex; connecting an inductor at the middle position of a direct current bus and a switching device, wherein when the inductor enters freewheeling, the voltage at two ends of the inductor is not 0V and has a certain difference with the actual operation; meanwhile, the inductance is not an ideal device, parasitic capacitance exists, and the inductances at different positions can change the consistency of the circuit, so that the test accuracy is reduced.
Therefore, how to simplify the testing process, ensure the consistency of the testing and the working state in practical application, and improve the testing accuracy has become one of the problems to be solved by those skilled in the art.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, the present invention aims to provide a dynamic characteristic testing circuit and method for a T-type three-level converter unit, which are used for solving the problems of complex dynamic characteristic testing process, consistent working state and poor accuracy in actual application of the T-type three-level converter unit in the prior art.
To achieve the above and other related objects, the present invention provides a dynamic characteristic test circuit of a T-type three-level converter unit, the dynamic characteristic test circuit of the T-type three-level converter unit at least includes:
the device comprises a charge-discharge control unit, a first capacitor, a second capacitor, a T-shaped three-level converter unit and an inductor;
the charge-discharge control unit provides a charge current or a discharge path for the first capacitor and the second capacitor;
the upper polar plate of the first capacitor is connected with the positive electrode of the output end of the charge-discharge control unit, the lower polar plate of the first capacitor is connected with the upper polar plate of the second capacitor, and the lower polar plate of the second capacitor is connected with the negative electrode of the output end of the charge-discharge control unit;
the T-shaped three-level current conversion unit adjusts current flow direction and output level through a switch time sequence and comprises a first power device, a second power device, a third power device, a fourth power device, a first diode, a second diode, a third diode and a fourth diode; the first end of the first power device is connected with the positive electrode of the output end of the charge-discharge control unit, and the second end of the first power device is connected with the first end of the second power device and is used as the output end of the T-shaped three-level converter unit; the second end of the second power device is connected with the negative electrode of the output end of the charge-discharge control unit; the second end of the third power device is connected with a connecting node of the first capacitor and the second capacitor, and the first end of the third power device is connected with the first end of the fourth power device; the second end of the fourth power device is connected with the output end of the T-shaped three-level converter unit; each diode is respectively connected in parallel with two ends of the corresponding power device, wherein the cathode of the diode is connected with the first end of the corresponding power device, and the anode of the diode is connected with the second end of the corresponding power device;
and a first end of the inductor is connected with a voltage output end of the T-shaped three-level converter unit, and a second end of the inductor is connected with a connecting node of the first capacitor and the second capacitor.
Optionally, the charge-discharge control unit includes a dc power supply, a first switch, and a second switch; the first end of the first switch is connected with the positive electrode of the direct current power supply, and the second end of the first switch is connected with the upper polar plate of the first capacitor; the first end of the second switch is connected with the second end of the first switch, and the second end of the second switch is connected with the negative electrode of the direct current power supply.
More optionally, the charge-discharge control unit further includes a resistor, and the resistor is connected between the second end of the second switch and the negative electrode of the dc power supply.
Optionally, the dynamic characteristic test circuit of the T-type three-level converter unit further includes a first overcurrent protection unit and a second overcurrent protection unit, where the first overcurrent protection unit is connected between the positive electrode of the output end of the charge-discharge control unit and the upper electrode plate of the first capacitor, and the second overcurrent protection unit is connected between the lower electrode plate of the first capacitor and the upper electrode plate of the second capacitor.
More optionally, each diode is a body diode or a separate device.
In order to achieve the above and other related objects, the present invention provides a method for testing the dynamic characteristics of a T-type three-level converter unit, which is implemented by using the dynamic characteristics testing circuit of a T-type three-level converter unit, and the method for testing the dynamic characteristics of a T-type three-level converter unit at least includes:
testing based on the working condition of positive voltage and positive current to evaluate the dynamic characteristics of the first power device and the third diode connected in parallel at two ends of the third power device;
and testing based on the working condition of positive voltage and negative current to evaluate the dynamic characteristics of the third power device and the first diodes connected in parallel at two ends of the first power device.
Optionally, the method for evaluating the dynamic characteristics of the first power device and the third diode includes:
11 The first power device is turned on, the second power device and the third power device are turned off, and current flows from the upper polar plate of the first capacitor to the lower polar plate of the first capacitor through the first power device and the inductor;
12 Turning off the first power device and the second power device, turning on the fourth power device, turning on the follow current by the third diode, and returning the current from the second end of the inductor to the first end of the inductor through the third diode and the fourth power device;
13 The first power device is turned on, the second power device and the third power device are turned off, reverse recovery occurs to the third diode, and current flows from the upper electrode plate of the first capacitor through the first power device and the inductor to the lower electrode plate of the first capacitor.
More optionally, in step 11), the fourth power device is turned on or off; in step 12) the third power device is turned on or off; the fourth power device is turned on or off in step 13).
Optionally, the method for evaluating the dynamic characteristics of the third power device and the first diode includes:
21 The second power device is turned on, the first power device, the third power device and the fourth power device are turned off, and current flows from the upper polar plate of the second capacitor, through the inductor and the second power device, and returns to the lower polar plate of the second capacitor;
22 The second power device and the third power device are turned off, the first diode turns on freewheeling, and current returns to the second end of the inductor from the first end of the inductor through the first diode and the first capacitor;
23 The first power device and the second power device are turned off, the third power device is turned on, reverse recovery occurs in the first diode, and current flows from the first end of the inductor, through the fourth diode connected in parallel to the two ends of the fourth power device, and the third power device returns to the second end of the inductor.
More optionally, in step 22), the first power device is turned on or off and the fourth power device is turned on or off; the fourth power device is turned on or off in step 23).
As described above, the dynamic characteristic test circuit and method of the T-shaped three-level converter unit have the following beneficial effects:
1. the dynamic characteristic test circuit and the method for the T-shaped three-level converter unit can test the dynamic characteristic of the T-shaped three-level converter unit, and the test circuit has the advantages of simple structure, high efficiency, comprehensive functions and convenience in realizing automatic test.
2. The dynamic characteristic test circuit and the method of the T-shaped three-level converter unit can realize different working condition tests without switching the inductance position in the same circuit, and are convenient to operate; and the consistency of the circuit is prevented from being changed due to the switching of the inductance position, and the testing accuracy is high.
3. In the dynamic characteristic test circuit and method of the T-shaped three-level converter unit, when the inductor enters the follow current, the voltage at the two ends of the inductor is 0V, so that the actual application working condition is restored, and the test accuracy is further improved.
4. The dynamic characteristic test circuit and method of the T-shaped three-level converter unit adopt overcurrent protection, so that devices or circuits are prevented from being damaged when the current is overlarge.
Drawings
Fig. 1 is a schematic diagram of a dynamic characteristic test circuit of a T-type three-level converter unit according to the present invention.
Fig. 2 is a schematic diagram showing the control timing of the present invention under positive voltage and positive current conditions.
Fig. 3 shows a schematic diagram of the current trend under positive voltage and positive current conditions.
Fig. 4 is a schematic diagram showing simulation results of the present invention under positive voltage and positive current conditions.
Fig. 5 is a schematic diagram showing the control timing sequence of the present invention under the positive voltage and negative current conditions.
Fig. 6 shows a schematic diagram of the current trend under the positive voltage and negative current conditions.
Fig. 7 is a schematic diagram showing simulation results of the present invention under positive voltage and negative current conditions.
Description of element reference numerals
Dynamic characteristic test circuit of 1T type three-level converter unit
11. Charge-discharge control unit
12 T-shaped three-level converter unit
13. First overcurrent protection unit
14. Second overcurrent protection unit
Detailed Description
Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention.
Please refer to fig. 1-7. It should be noted that, the illustrations provided in the present embodiment merely illustrate the basic concept of the present invention by way of illustration, and only the components related to the present invention are shown in the drawings and are not drawn according to the number, shape and size of the components in actual implementation, and the form, number and proportion of the components in actual implementation may be arbitrarily changed, and the layout of the components may be more complex.
As shown in fig. 1, the present embodiment provides a dynamic characteristic test circuit 1 of a T-type three-level converter unit, the dynamic characteristic test circuit 1 of the T-type three-level converter unit includes:
the charge-discharge control unit 11, the first capacitor C1, the second capacitor C2, the T-type three-level converter unit 12 and the inductor L1.
As shown in fig. 1, the charge/discharge control unit 11 provides a charge current or a discharge path for the first capacitor C1 and the second capacitor C2.
Specifically, in the present embodiment, the charge/discharge control unit 11 includes a dc power supply VDD, a first switch SW1, and a second switch SW2. The first switch SW1 has a first end connected to the positive electrode of the dc power supply VDD, and a second end (serving as the positive electrode of the output end of the charge/discharge control unit 11) connected to the upper electrode plate of the first capacitor C1. The first end of the second switch SW2 is connected to the second end of the first switch SW1, and the second end is connected to the negative electrode of the dc power supply VDD (as the negative electrode of the output end of the charge/discharge control unit 11). When the first switch SW1 is turned on and the second switch SW2 is turned off, the dc power supply VDD charges the first capacitor C1 and the second capacitor C2 through the first switch SW 1. When the first switch SW1 is turned off and the second switch SW2 is turned on, the first capacitor C1 and the second capacitor C2 are discharged through the second switch SW2.
As another implementation manner of the present invention, the charge-discharge control unit 11 further includes a resistor R1, where the resistor R1 is connected between the second end of the second switch SW2 and the negative electrode of the dc power supply VDD, and is used for controlling the discharging currents of the first capacitor C1 and the second capacitor C2, so that the voltages of the first capacitor C1 and the second capacitor C2 can be safely discharged after the experiment is finished.
As shown in fig. 1, an upper electrode plate of the first capacitor C1 is connected with an anode of the output end of the charge-discharge control unit 11, a lower electrode plate of the first capacitor C1 is connected with an upper electrode plate of the second capacitor C2, and a lower electrode plate of the second capacitor C2 is connected with a cathode of the output end of the charge-discharge control unit 11.
As another implementation manner of the present invention, the dynamic characteristic test circuit 1 of the T-type three-level converter unit further includes a first overcurrent protection unit 13 and a second overcurrent protection unit 14, so as to avoid damaging devices and circuits during overcurrent. The first overcurrent protection unit 13 is connected between the positive electrode of the output end of the charge-discharge control unit 11 and the upper polar plate of the first capacitor C1; the first overcurrent protection unit 13 detects the charge and discharge current of the first capacitor C1, and disconnects the upper electrode plate of the first capacitor C1 from the positive electrode of the output end of the charge and discharge control unit 11 when the charge and discharge current exceeds a corresponding preset value, thereby realizing overcurrent protection. The second overcurrent protection unit 14 is connected between the lower plate of the first capacitor C1 and the upper plate of the second capacitor C2; the second overcurrent protection unit 14 detects the charge and discharge current of the second capacitor C2, and disconnects the upper plate of the second capacitor C2 from the lower plate of the first capacitor C1 when the charge and discharge current exceeds a corresponding preset value, thereby realizing overcurrent protection. The first overcurrent protection unit 13 and the second overcurrent protection unit 14 may be implemented by detecting a sampling resistor or directly measuring a current, which is not described in detail herein.
As shown in fig. 1, the T-type three-level converter unit 12 adjusts the current flow direction and the output level by adjusting the switching timing.
Specifically, the T-type three-level converter unit 12 includes a first power device S1, a second power device S2, a third power device S3, a fourth power device S4, a first diode D1, a second diode D2, a third diode D3, and a fourth diode D4. The first end of the first power device S1 is connected to the positive electrode of the output end of the charge-discharge control unit 11, the second end of the first power device S1 is connected to the first end of the second power device S2 and is used as the output end of the T-type three-level converter unit 12, and the control end receives a first control signal CTL1; a second end of the second power device S2 is connected to the negative electrode of the output end of the charge-discharge control unit 11, and a control end receives a second control signal CTL2; a second end of the third power device S3 is connected to a connection node of the first capacitor C1 and the second capacitor C2, a first end is connected to a first end of the fourth power device S4, and a control end receives a third control signal CTL3; the second end of the fourth power device S4 is connected to the output end of the T-type three-level converter unit 12, and the control end receives the fourth control signal CTL4. Each diode is respectively connected in parallel with two ends of a corresponding power device, in this example, the cathode of the first diode D1 is connected with the first end of the first power device S1, and the anode is connected with the second end of the first power device S1; the cathode of the second diode D2 is connected with the first end of the second power device S2, and the anode of the second diode D2 is connected with the second end of the second power device S2; the cathode of the third diode D3 is connected with the first end of the third power device S3, and the anode of the third diode D3 is connected with the second end of the third power device S3; the cathode of the fourth diode D2 is connected to the first end of the fourth power device S4, and the anode is connected to the second end of the fourth power device S4.
In this embodiment, the first power device S1, the second power device S2, the third power device S3, and the fourth power device S4 are implemented by NMOS transistors, and at this time, the first end of each power device is a drain, the second end is a source, and the gate is used as a control end to receive a control signal (high-level conduction). In practical use, the types of the power devices can be set according to the needs, including, but not limited to, MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) and IGBT (Insulated Gate Bipolar Transistor ), and any power device with a controllable switching function is suitable for the present invention, and is not described herein in detail.
It should be noted that, the first diode D1, the second diode D2, the third diode D3, and the fourth diode D4 are body diodes of corresponding power devices, or are independent devices connected in parallel at two ends of the corresponding power devices.
As shown in fig. 1, a first end of the inductor L1 is connected to the voltage output end of the T-type three-level converter unit 12, and a second end is connected to a connection node between the first capacitor C1 and the second capacitor C2.
Specifically, the inductor L1 is a load inductor, and provides a current required by a load. In the invention, the connection mode of the inductor L1 can restore the working condition of the T-shaped three-level converter unit 12 in practical application, meanwhile, the inductor position does not need to be switched in the test process, and the accuracy and convenience of the test are effectively improved.
As shown in fig. 1, the T-type three-level converter 12 is mainly used for an inverter circuit, and the meaning of three levels is that the output voltage can be three voltage values of 0.5U, 0 and-0.5U, and U is the voltage value of the dc power supply VDD. For a voltage type inverter, when a non-resistive load is applied, a phase difference exists between output voltage and current, so four working conditions of positive voltage positive current, positive voltage negative current, negative voltage positive current and negative voltage negative current exist.
The positive and negative currents are realized by controlling the current polarity of the inductor L1. When the first power device S1 is turned on, the second power device S2 and the third power device S3 are turned off, the voltage on the first capacitor C1 is applied to the inductor L1, the current flows through the C1-S1-L1-C1 and gradually increases under the action of the capacitor, and the inductor current at this time is defined as the forward direction. When the second power device S2 is turned on and the other switches are turned off, the voltage on the second capacitor C2 is reversely applied to the inductor L1, and the current flows through the capacitor C2-L1-S2-C2 and gradually increases under the action of the capacitor, so as to define that the inductor current at the moment is negative. Therefore, the positive current or the negative current of the inductor can be realized by controlling the S1 to S4, and the position of the inductor does not need to be switched. When the third power device S3 is turned on, the voltage at two ends of the inductor L1 is positive; when the third power device S3 and the fourth power device S4 are turned on, the voltage at two ends of the inductor L1 is 0V, which is the same as the working condition of the T-type three-level converter unit in practical application.
The positive voltage output is realized by controlling the first power device S1, the negative voltage output is realized by controlling the second power device S2, and the working conditions of positive and negative voltages are mirror symmetry, so that the dynamic characteristics of the power device can be mastered by only testing two working conditions of positive voltage positive current and positive voltage negative current for the test of the three-level converter unit. The method for testing the dynamic characteristics of the T-shaped three-level converter unit comprises the following steps:
and testing based on the working condition of positive voltage and positive current to evaluate the dynamic characteristics of the first power device S1 and the third diode D3 connected in parallel at two ends of the third power device S3.
Specifically, the method comprises the following steps, as shown in fig. 2-4:
11 The first power device S1 is turned on, the second power device S2 and the third power device S3 are turned off, the fourth power device S4 is turned on or off, and current flows from the upper electrode plate of the first capacitor C1, through the first power device S1 and the inductor L1, and returns to the lower electrode plate of the first capacitor C1. As shown in fig. 2, in this example, the control signal is 1001 (corresponding to the first control signal CTL1, the second control signal CTL2, the third control signal CTL3, and the fourth control signal CTL4 in order), that is, the first power device S1 and the fourth power device S4 are turned on, and the second power device S2 and the third power device S3 are turned off; at this time, the current of the inductor L1 gradually increases under the voltage across the first capacitor C1, energy is stored in the inductor L1, the current trend is shown as 1001 in fig. 3, and the output voltage Vo is a positive voltage (the maximum value is 0.5U).
12 The first power device S1 and the second power device S2 are turned off, the fourth power device S4 is turned on, the third power device S3 is turned on or off, current flows through the third diode D3, and the current flows from the second end of the inductor L1 through the third diode D3 and the fourth power device S4 back to the first end of the inductor L1. As shown in fig. 2, in this example, the control signal is 0011, that is, the first power device S1 and the second power device S2 are turned off, and the third power device S3 and the fourth power device S4 are turned on; at this time, during the process of turning off the first power device S1, the third diode D3 turns on freewheeling due to the characteristic that the inductor current does not suddenly change, and the current trend is shown as 0011 in fig. 3, and the output voltage Vo is switched from positive voltage to 0V. And starting the third power device S3 (the third power device S3 is not required to be started) in the follow current process to realize the synchronous rectification function.
13 The first power device S1 is turned on, the second power device S2 and the third power device S3 are turned off, and the fourth power device S4 is turned on or off. The current flows from the upper plate of the first capacitor C1 through the first power device S1 and the inductor L1 back to the lower plate of the first capacitor C1. As shown in fig. 2, in this example, the control signal is 1001, that is, the first power device S1 and the fourth power device S4 are turned on, and the second power device S2 and the third power device S3 are turned off; since the third diode D3 passes a current in the previous stage, reverse recovery of the third diode D3 occurs when the first power device S1 is turned on. The current trend is shown as 1001 in fig. 3, and the output voltage Vo is switched from 0V to positive voltage.
As shown in fig. 4, the dynamic characteristic simulation result under the positive voltage and positive current working condition is shown, wherein the solid line is the drain-source voltage curve of the first power device S1, the dotted line is the current curve flowing through the first power device S1, and the peak of the current curve is the reverse recovery current of the third diode D3. It can be seen that the dynamic characteristics of the first power device S1 and the third diode D3 are evaluated by two switching operations of the first power device S1.
And testing based on the working condition of positive voltage and negative current to evaluate the dynamic characteristics of the third power device S3 and the first diode D1 connected in parallel at two ends of the first power device S1.
Specifically, the method comprises the following steps, as shown in fig. 5 to 7:
21 The second power device S2 is turned on, the first power device S1, the third power device S3 and the fourth power device S4 are turned off, and current flows from the upper electrode plate of the second capacitor C2 through the inductor L1 and the second power device S2 to the lower electrode plate of the second capacitor C2. As shown in fig. 5, in this example, the control signal is 0100, at this time, the inductor L1 is charged by the voltage across the capacitor C2, the current of the inductor L1 gradually increases, the current trend is 0100 in fig. 6, and the output voltage Vo is a positive voltage (the maximum value is 0.5U).
22 The second power device S2 and the third power device S3 are turned off, the first power device S1 is turned on or turned off, the fourth power device S4 is turned on or turned off, the first diode D1 turns on the freewheeling, and the current flows from the first end of the inductor L1 through the first diode D1 and the first capacitor C1 back to the second end of the inductor L1. As shown in fig. 5, in this example, the control signal is 1001, that is, the second power device S2 and the third power device S3 are turned off, and the first power device S1 and the fourth power device S4 are turned on; at this time, the inductor L1 charges the first capacitor C1, and during the process of turning off the second power device S2, according to the characteristic that the inductor current does not break, the inductor current freewheels through the first diode D1, and the current trend is as shown by 1001 in fig. 6, and the output voltage Vo is switched from the positive voltage to 0V. Turning on the first power device S1 in this process (turning on the first power device S1 is not necessary) enters synchronous rectification.
23 The first power device S1 and the second power device S2 are turned off, the third power device S3 is turned on, the fourth power device S4 is turned on or off, reverse recovery occurs to the first diode D1, and current flows from the first end of the inductor L1 through the fourth diode D4 connected in parallel to the two ends of the fourth power device S4, and the third power device S3 returns to the second end of the inductor L1. As shown in fig. 5, in this example, the control signal is 0011, that is, the first power device S1 and the second power device S2 are turned off, and the third power device S3 and the fourth power device S4 are turned on; at this time, due to the freewheeling of the first diode D1, the first diode D1 will reverse recovery when the third power device S3 is turned on, and the current flow is shown as 0011 in fig. 6, and the output voltage Vo is switched from the positive voltage to 0V.
As shown in fig. 7, the dynamic characteristic simulation result under the positive voltage and negative current conditions is shown, wherein the solid line is the drain-source voltage curve of the third power device S3, the dotted line is the current curve flowing through the third power device S3, and the peak of the current curve is the reverse recovery current of the first diode D1. As can be seen from this, the evaluation of the dynamic characteristics of the third power device S3 and the first diode D1 is achieved through the above-described switching operation.
In summary, the present invention provides a dynamic characteristic test circuit and method for a T-type three-level converter unit, including: the device comprises a charge-discharge control unit, a first capacitor, a second capacitor, a T-shaped three-level converter unit and an inductor; the charge-discharge control unit provides a charge current or a discharge path for the first capacitor and the second capacitor; the upper polar plate of the first capacitor is connected with the positive electrode of the output end of the charge-discharge control unit, the lower polar plate of the first capacitor is connected with the upper polar plate of the second capacitor, and the lower polar plate of the second capacitor is connected with the negative electrode of the output end of the charge-discharge control unit; the T-shaped three-level current conversion unit adjusts current flow direction and output level by adjusting switch time sequence, and comprises a first power device, a second power device, a third power device, a fourth power device, a first diode, a second diode, a third diode and a fourth diode; the first end of the first power device is connected with the positive electrode of the output end of the charge-discharge control unit, and the second end of the first power device is connected with the first end of the second power device and is used as the output end of the T-shaped three-level converter unit; the second end of the second power device is connected with the negative electrode of the output end of the charge-discharge control unit; the second end of the third power device is connected with a connecting node of the first capacitor and the second capacitor, and the first end of the third power device is connected with the first end of the fourth power device; the second end of the fourth power device is connected with the output end of the T-shaped three-level converter unit; each diode is respectively connected in parallel with two ends of the corresponding power device, wherein the cathode of the diode is connected with the first end of the corresponding power device, and the anode of the diode is connected with the second end of the corresponding power device; and a first end of the inductor is connected with a voltage output end of the T-shaped three-level converter unit, and a second end of the inductor is connected with a connecting node of the first capacitor and the second capacitor. The dynamic characteristic test circuit and the method of the T-shaped three-level converter unit have the advantages of simple structure, high efficiency and comprehensive functions, and are convenient for realizing automatic test; different working conditions can be tested without switching the inductance position in the same circuit, and the operation is convenient; the consistency of the circuit is prevented from being changed due to the switching of the inductance position, and the test accuracy is high; when the inductor enters the follow current, the voltage at the two ends of the inductor is 0V, so that the actual application working condition is reduced, and the test accuracy is further improved; overcurrent protection is adopted to avoid damaging devices or circuits when the current is excessive. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.
The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications and variations of the invention be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.

Claims (10)

1. The dynamic characteristic test circuit of the T-shaped three-level converter unit is characterized by at least comprising:
the device comprises a charge-discharge control unit, a first capacitor, a second capacitor, a T-shaped three-level converter unit and an inductor;
the charge-discharge control unit provides a charge current or a discharge path for the first capacitor and the second capacitor;
the upper polar plate of the first capacitor is connected with the positive electrode of the output end of the charge-discharge control unit, the lower polar plate of the first capacitor is connected with the upper polar plate of the second capacitor, and the lower polar plate of the second capacitor is connected with the negative electrode of the output end of the charge-discharge control unit;
the T-shaped three-level current conversion unit adjusts current flow direction and output level through a switch time sequence and comprises a first power device, a second power device, a third power device, a fourth power device, a first diode, a second diode, a third diode and a fourth diode; the first end of the first power device is connected with the positive electrode of the output end of the charge-discharge control unit, and the second end of the first power device is connected with the first end of the second power device and is used as the output end of the T-shaped three-level converter unit; the second end of the second power device is connected with the negative electrode of the output end of the charge-discharge control unit; the second end of the third power device is connected with a connecting node of the first capacitor and the second capacitor, and the first end of the third power device is connected with the first end of the fourth power device; the second end of the fourth power device is connected with the output end of the T-shaped three-level converter unit; each diode is respectively connected in parallel with two ends of the corresponding power device, wherein the cathode of the diode is connected with the first end of the corresponding power device, and the anode of the diode is connected with the second end of the corresponding power device;
and a first end of the inductor is connected with a voltage output end of the T-shaped three-level converter unit, and a second end of the inductor is connected with a connecting node of the first capacitor and the second capacitor.
2. The dynamic characteristic test circuit of a T-type three-level converter cell according to claim 1, wherein: the charge-discharge control unit comprises a direct-current power supply, a first switch and a second switch; the first end of the first switch is connected with the positive electrode of the direct current power supply, and the second end of the first switch is connected with the upper polar plate of the first capacitor; the first end of the second switch is connected with the second end of the first switch, and the second end of the second switch is connected with the negative electrode of the direct current power supply.
3. The dynamic characteristic test circuit of a T-type three-level converter cell according to claim 2, wherein: the charging and discharging control unit further comprises a resistor, and the resistor is connected between the second end of the second switch and the negative electrode of the direct-current power supply.
4. The dynamic characteristic test circuit of a T-type three-level converter cell according to claim 1, wherein: the dynamic characteristic test circuit of the T-shaped three-level current conversion unit further comprises a first overcurrent protection unit and a second overcurrent protection unit, wherein the first overcurrent protection unit is connected between the positive electrode of the output end of the charge-discharge control unit and the upper polar plate of the first capacitor, and the second overcurrent protection unit is connected between the lower polar plate of the first capacitor and the upper polar plate of the second capacitor.
5. The dynamic characteristic test circuit of a T-type three-level converter cell according to any one of claims 1 to 4, wherein: each diode is a body diode or an independent device.
6. The method for testing the dynamic characteristics of the T-type three-level converter unit is implemented by adopting the dynamic characteristics testing circuit of the T-type three-level converter unit according to any one of claims 1 to 5, and is characterized in that the method for testing the dynamic characteristics of the T-type three-level converter unit at least comprises the following steps:
testing based on the working condition of positive voltage and positive current to evaluate the dynamic characteristics of the first power device and the third diode connected in parallel at two ends of the third power device;
and testing based on the working condition of positive voltage and negative current to evaluate the dynamic characteristics of the third power device and the first diodes connected in parallel at two ends of the first power device.
7. The method for testing the dynamic characteristics of the T-type three-level converter cell according to claim 6, wherein: the method for evaluating the dynamic characteristics of the first power device and the third diode comprises the following steps:
11 The first power device is turned on, the second power device and the third power device are turned off, and current flows from the upper polar plate of the first capacitor to the lower polar plate of the first capacitor through the first power device and the inductor;
12 Turning off the first power device and the second power device, turning on the fourth power device, turning on the follow current by the third diode, and returning the current from the second end of the inductor to the first end of the inductor through the third diode and the fourth power device;
13 The first power device is turned on, the second power device and the third power device are turned off, reverse recovery occurs to the third diode, and current flows from the upper electrode plate of the first capacitor through the first power device and the inductor to the lower electrode plate of the first capacitor.
8. The method for testing the dynamic characteristics of the T-type three-level converter cell according to claim 7, wherein: in step 11), the fourth power device is turned on or off; in step 12) the third power device is turned on or off; the fourth power device is turned on or off in step 13).
9. The method for testing the dynamic characteristics of the T-type three-level converter cell according to claim 6, wherein: the method for evaluating the dynamic characteristics of the third power device and the first diode comprises the following steps:
21 The second power device is turned on, the first power device, the third power device and the fourth power device are turned off, and current flows from the upper polar plate of the second capacitor, through the inductor and the second power device, and returns to the lower polar plate of the second capacitor;
22 The second power device and the third power device are turned off, the first diode turns on freewheeling, and current returns to the second end of the inductor from the first end of the inductor through the first diode and the first capacitor;
23 The first power device and the second power device are turned off, the third power device is turned on, reverse recovery occurs in the first diode, and current flows from the first end of the inductor, through the fourth diode connected in parallel to the two ends of the fourth power device, and the third power device returns to the second end of the inductor.
10. The method for testing the dynamic characteristics of the T-type three-level converter cell according to claim 9, wherein: in step 22) the first power device is turned on or off and the fourth power device is turned on or off; the fourth power device is turned on or off in step 23).
CN202210837340.4A 2022-07-15 2022-07-15 Dynamic characteristic test circuit and method for T-shaped three-level converter unit Pending CN117434358A (en)

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