Power cycle test system for power module

Abstract

The utility model discloses a power cycle test system used for a power module. The power cycle test system comprises a shunting unit used for supplying power to the power module, a detection unit electrically connected with the shunting unit, a trigger unit and an adjusting unit. A resistor R2 and a potentiometer TR2 are used for parallel shunt regulation, so that an output power supply end OUT keeps fixed output power; the thermistor P1 and the thermistor P2 are used for monitoring the temperature of the output path of the parallel shunt of the resistor R2 and the potentiometer TR2, the internal resistance values of the thermistor P1 and the thermistor P2 are reduced according to the increase of the temperature, and the power supply is switched on; the triode Q1 obtains the conduction power supply of the thermistor P1 and the thermistor P2, and enables the relay T to be electrified to control the contact switching of the normally-closed contact S, thereby converting the paths of the input power supply end IN and the output power supply end OUT.

Description

Technical Field

[0001] The utility model relates to the technical field of power regulation, and specifically relates to a power cycling test system for a power module. Background Art

[0002] Power cycling test is one of the tests for evaluating the reliability of power device packages. This test heats through load current and switches on and off to simulate the junction temperature fluctuation of the device during operation, and accelerates aging to a certain extent to expose the weak points of the device package in advance, which helps to evaluate the impact of the difference in the thermal expansion coefficient of packaging materials on the device life and is the most important reliability test for evaluating the reliability of power device packages; for electric power, its magnitude is related to voltage, current, and resistance.

[0003] The existing power cycling test controls the output power by adjusting voltage, current, and resistance. Therefore, it can only adjust the output power value and cannot monitor the temperature of the path in the output power and automatically adjust the output power according to the change of the path temperature. Summary of the Utility Model

[0004] Purpose of the utility model: To provide a power cycling test system for a power module to solve the above problems existing in the prior art.

[0005] Technical solution: A power cycling test system for a power module includes:

[0006] A shunt unit for supplying power to the power module, electrically connected to a detection unit, a trigger unit, and an adjustment unit;

[0007] The shunt unit is adjusted for parallel shunt through a resistor R2 and a potentiometer TR2;

[0008] The detection unit monitors the temperature of the output path of the parallel shunt of the resistor R2 and the potentiometer TR2 through a thermistor P1 and a thermistor P2;

[0009] The trigger unit obtains the conduction power supply of the thermistor P1 and the thermistor P2 through the base terminal of a triode Q1, and controls the switching of the normally closed contact S through a relay T;

[0010] The adjustment unit obtains the voltage drop value of the input power supply terminal IN through the base terminal of the triode Q1 via a resistor R1, and then converts the power transmission path from the input power supply terminal IN to the output power supply terminal OUT.

[0011] In a further embodiment, the shunt unit includes a capacitor C2, a diode D1, a resistor R2, and a potentiometer TR2. One end of the capacitor C2 is connected to one end of the resistor R2, the negative electrode end of the diode D1, and the pin 1 of the potentiometer TR2 respectively. The other end of the capacitor C2 is connected to the ground wire GND and the positive electrode end of the diode D1 respectively. The other end of the resistor R2 is connected to the output power supply terminal OUT, the pin 2 and the pin 3 of the potentiometer TR2 respectively. The output power supply terminal OUT is connected to the power module.

[0012] In a further embodiment, the detection unit includes a thermistor P1, a thermistor P2, a diode D2, and a capacitor C1. One end of the thermistor P1 is connected to one end of the thermistor P2 and one end of the normally closed contact S respectively. The other end of the thermistor P1 is connected to the other end of the thermistor P2. One end of the capacitor C1 is connected to the positive electrode end of the diode D2. The other end of the capacitor C1 is connected to the ground wire GND. The negative electrode end of the diode D2 is connected to the output power supply terminal OUT.

[0013] In a further embodiment, the trigger unit includes a triode Q2, a relay T, a relay T1, a normally closed contact S, and a normally closed contact S1. The collector terminal of the triode Q2 is connected to one end of the thermistor P2. The base terminal of the triode Q2 is connected to the other end of the thermistor P2 and one end of the normally closed contact S1 respectively. The other end of the normally closed contact S1 is connected to one end of the capacitor C1. The emitter terminal of the triode Q2 is connected to one end of the relay T. The other end of the relay T is connected to the ground wire GND. One end of the normally closed contact S is connected to the input power supply terminal IN. The other end of the normally closed contact S is connected to one end of the capacitor C2. One end of the relay T1 is connected to the ground wire GND.

[0014] In a further embodiment, the normally closed contact S is further provided with a pin 1, and the pin 1 is connected to one end of the resistor R1.

[0015] In a further embodiment, the adjustment unit includes a triode Q1, a resistor R1, and a potentiometer TR1. The base terminal of the triode Q1 is connected to one end of the resistor R1 and the other end of the relay T1 respectively. The other end of the resistor R1 is connected to the pin 1 of the normally closed contact S1 and the collector terminal of the triode Q1. The emitter terminal of the triode Q1 is connected to the pin 1 of the potentiometer TR1. The pin 2 and the pin 3 of the potentiometer TR1 are both connected to one end of the resistor R2.

[0016] In a further embodiment, the models of both the triode Q1 and the triode Q2 are NPN. When the relay T is energized, it controls the normally closed contact S to disconnect. When the relay T1 is energized, it controls the normally closed contact S1 to disconnect. The models of both the thermistor P1 and the thermistor P2 are negative temperature coefficient thermistors.

[0017] Beneficial effects: The utility model discloses a power cycle test system for a power module. The utility model adjusts the parallel shunt through the resistor R2 and the potentiometer TR2 to keep the output power of the output power supply terminal OUT fixed; while the thermistors P1 and P2 monitor the temperature of the output path of the parallel shunt of the resistor R2 and the potentiometer TR2. According to the increase in temperature, the internal resistance values of the thermistors P1 and P2 are reduced, and the power supply is turned on; the triode Q1 obtains the conduction power supply of the thermistors P1 and P2, and makes the relay T energized to control the contact switching of the normally closed contact S, thereby converting the path between the input power supply terminal IN and the output power supply terminal OUT. The base terminal of the triode Q1 obtains the step-down value of the input power supply terminal IN through the resistor R1. The conduction of the resistor R1 controls the disconnection of the normally closed contact S1 through the relay T1. Under the conduction of the triode Q1, series-parallel voltage division and shunt are carried out through the potentiometer TR1, the potentiometer TR2 and the resistor R2 to ensure safety under the power cycle adjustment test. Description of the Drawings

[0018] Figure 1 is the circuit distribution diagram of the utility model. Detailed Embodiment

[0019] The utility model discloses a power cycle test system for a power module. The parallel shunt is adjusted through the resistor R2 and the potentiometer TR2 to keep the output power of the output power supply terminal OUT fixed; while the thermistors P1 and P2 monitor the temperature of the output path of the parallel shunt of the resistor R2 and the potentiometer TR2. According to the increase in temperature, the internal resistance values of the thermistors P1 and P2 are reduced, and the power supply is turned on; the following is a specific description of the solution through specific embodiments.

[0020] Referring to Figure 1 shown, a power cycle test system for a power module includes:

[0021] A shunt unit for supplying power to the power module, an inspection unit, a trigger unit, and an adjustment unit electrically connected to the shunt unit;

[0022] The shunt unit includes a capacitor C2, a diode D1, a resistor R2, and a potentiometer TR2.

[0023] One end of the capacitor C2 is respectively connected to one end of the resistor R2, the negative terminal of the diode D1, and the pin 1 of the potentiometer TR2. The other end of the capacitor C2 is respectively connected to the ground wire GND and the positive terminal of the diode D1. The other end of the resistor R2 is respectively connected to the output power supply terminal OUT, the pin 2 and the pin 3 of the potentiometer TR2. The output power supply terminal OUT is connected to the power module, and the resistor R2 and the potentiometer TR2 perform parallel shunt adjustment.

[0024] The detection unit includes a thermistor P1, a thermistor P2, a diode D2, and a capacitor C1.

[0025] One end of the thermistor P1 is respectively connected to one end of the thermistor P2 and one end of the normally closed contact S. The other end of the thermistor P1 is connected to the other end of the thermistor P2. One end of the capacitor C1 is connected to the positive electrode end of the diode D2. The other end of the capacitor C1 is connected to the ground wire GND. The negative electrode end of the diode D2 is connected to the output power supply terminal OUT. The thermistor P1 and the thermistor P2 monitor the temperature of the output path where the resistor R2 and the potentiometer TR2 are connected in parallel for current shunting.

[0026] The trigger unit includes a triode Q2, a relay T, a relay T1, a normally closed contact S, and a normally closed contact S1.

[0027] The collector terminal of the triode Q2 is connected to one end of the thermistor P2. The base terminal of the triode Q2 is respectively connected to the other end of the thermistor P2 and one end of the normally closed contact S1. The other end of the normally closed contact S1 is connected to one end of the capacitor C1. The emitter terminal of the triode Q2 is connected to one end of the relay T. The other end of the relay T is connected to the ground wire GND. One end of the normally closed contact S is connected to the input power supply terminal IN. The other end of the normally closed contact S is connected to one end of the capacitor C2. One end of the relay T1 is connected to the ground wire GND. The normally closed contact S also has a pin 1, and the pin 1 is connected to one end of the resistor R1. The base terminal of the triode Q1 obtains the conduction power supply of the thermistor P1 and the thermistor P2, and controls the switching of the normally closed contact S through the relay T.

[0028] The adjustment unit includes a triode Q1, a resistor R1, and a potentiometer TR1.

[0029] The base terminal of the triode Q1 is respectively connected to one end of the resistor R1 and the other end of the relay T1. The other end of the resistor R1 is connected to the pin 1 of the normally closed contact S1 and the collector terminal of the triode Q1. The emitter terminal of the triode Q1 is connected to the pin 1 of the potentiometer TR1. The pin 2 and the pin 3 of the potentiometer TR1 are both connected to one end of the resistor R2. The base terminal of the triode Q1 obtains the stepped-down value of the input power supply terminal IN through the resistor R1, and then converts the power transmission path from the input power supply terminal IN to the output power supply terminal OUT.

[0030] Principle of operation description: First, adjust the resistance value of the potentiometer TR2, which is connected in parallel with the resistor R2 to form a first shunt circuit. At this time, the input power supply terminal IN supplies the adjusted output power to the output power supply terminal OUT through the normally closed contact S. When the potentiometer TR2 and the resistor R2 are connected in parallel to output a fixed value of current, the thermistor P1 and the thermistor P2 detect the temperature of the fixed value current output path.

[0031] When the detected temperature exceeds the set values of the thermistors P1 and P2, it conducts, and replaces the potentiometer TR2 and the resistor R2 to automatically adjust the output current according to the detected temperature value, and outputs through the diode D2.

[0032] When the triode Q2 obtains the conduction power supply of the thermistors P1 and P2 and conducts, at this time, the relay T is energized to control the normally closed contact S to disconnect and connect to the pin 1. At this time, the resistor R1 is energized.

[0033] When the power supply at the input power supply terminal IN reaches the set value of the resistor R1 and conducts, at this time, the relay T1 is energized to control the normally closed contact S1 to disconnect. At this time, the thermistors P1 and P2 only detect and do not output. Then, the triode Q1 conducts to control the power supply at the input power supply terminal IN to be transmitted to the output power supply terminal OUT through the potentiometer TR1, the potentiometer TR2, and the resistor R2, and then adjusts the conversion of the power according to the requirements of the power test to meet the control, conversion, and output under different power states.

[0034] The preferred embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, various equivalent transformations can be made to the technical solutions of the present invention, and these equivalent transformations all belong to the protection scope of the present invention.

Claims

1. A power cycle test system for a power module, comprising: A shunt unit for providing power to the power module, the detection unit, the trigger unit and the adjustment unit being electrically connected to the shunt unit; It is characterized in that the shunt unit is regulated by parallel shunt through resistor R2 and potentiometer TR2; The detection unit monitors the temperature of the output path of the parallel shunt connection of the resistor R2 and the potentiometer TR2 through the thermistors P1 and P2; The trigger unit obtains the conducting power of thermistor P1 and thermistor P2 through the base terminal of transistor Q1, and controls the switching of normally closed contact S through relay T; The regulating unit obtains the voltage drop value of the input power terminal IN through the base terminal of the transistor Q1 via the resistor R1, and then converts the power transmission path from the input power terminal IN to the output power terminal OUT.

2. A power cycle test system for a power module according to claim 1, characterized in that: The shunt unit includes a capacitor C2, a diode D1, a resistor R2 and a potentiometer TR2, one end of the capacitor C2 is respectively connected to one end of the resistor R2, the negative end of the diode D1 and the pin 1 of the potentiometer TR2, the other end of the capacitor C2 is respectively connected to the ground wire GND and the positive end of the diode D1, the other end of the resistor R2 is respectively connected to the output power supply terminal OUT, the pin 2 and the pin 3 of the potentiometer TR2, and the output power supply terminal OUT is connected to the power module.

3. A power cycle test system for a power module according to claim 1, characterized in that: The detection unit includes a thermistor P1, a thermistor P2, a diode D2 and a capacitor C1, one end of the thermistor P1 is respectively connected to one end of the thermistor P2 and one end of a normally closed contact S, the other end of the thermistor P1 is connected to the other end of the thermistor P2, one end of the capacitor C1 is connected to the positive end of the diode D2, the other end of the capacitor C1 is connected to the ground wire GND, and the negative end of the diode D2 is connected to the output power supply end OUT.

4. A power cycle test system for a power module according to claim 1, characterized in that: The trigger unit includes a transistor Q2, a relay T, a relay T1, a normally closed contact S and a normally closed contact S1. The collector end of the transistor Q2 is connected to one end of the thermistor P2, the base end of the transistor Q2 is respectively connected to the other end of the thermistor P2 and one end of the normally closed contact S1, the other end of the normally closed contact S1 is connected to one end of the capacitor C1, the emitter end of the transistor Q2 is connected to one end of the relay T, the other end of the relay T is connected to the ground wire GND, one end of the normally closed contact S is connected to the input power supply end IN, and the other end of the normally closed contact S is connected to one end of the capacitor C2; one end of the relay T1 is connected to the ground wire GND.

5. A power cycle test system for a power module according to claim 4, characterized in that: The normally closed contact S is further provided with a pin 1, and the pin 1 is connected to one end of the resistor R1.

6. A power cycle test system for a power module according to claim 1, characterized in that: The regulating unit includes a transistor Q1, a resistor R1 and a potentiometer TR1, the base end of the transistor Q1 is respectively connected to one end of the resistor R1 and the other end of the relay T1, the other end of the resistor R1 is connected to the pin 1 of the normally closed contact S1 and the collector end of the transistor Q1, the emitter end of the transistor Q1 is connected to the pin 1 of the potentiometer TR1, and the pins 2 and 3 of the potentiometer TR1 are both connected to one end of the resistor R2.

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