Power supply device and test machine

Abstract

The utility model relates to a power supply device and a test machine, and the power supply device comprises a buck-boost topology module which is connected with a power supply input end and a power supply output end, carries out the boost / buck processing of a voltage connected to the power supply input end according to a received adjustment signal, and outputs the processed voltage through the power supply output end; the voltage sampling module is connected with the power supply output end, samples the voltage output by the power supply output end and outputs the sampled voltage; and the control module is connected with the voltage sampling module and the buck-boost topology module, receives the sampling voltage and the reference voltage, and outputs an adjusting signal to the buck-boost topology module. The boost-buck topology module can be utilized to perform boost or buck processing according to test requirements, so that the output voltage range of the power supply device is expanded, the test requirements of large-range output voltage are met, and the test convenience is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of semiconductor testing, in particular to a power supply device and a test machine. BACKGROUND

[0002] Semiconductor automatic testing refers to detecting various parameter indexes of a device under test (DUT) by using an automatic test equipment (ATE) to eliminate defective products to control the quality of semiconductor devices. A power supply board card is used to provide voltage or current excitation for a device under test in a semiconductor test equipment to realize functions such as voltage and current measurement. A traditional power supply board card adopts a step-down scheme, and the voltage provided can only be lower than the voltage connected, which cannot meet the wide range of output voltage requirements of the automatic test equipment, and has the disadvantage of low test convenience. CONTENT OF THE UTILITY MODEL

[0003] Therefore, it is necessary to provide a power supply device and a test machine which can improve test convenience in view of the above problems.

[0004] The first aspect of the present application provides a power supply device, comprising:

[0005] A step-up / down topology module is connected to a power input end and a power output end, performs step-up / down processing on the voltage connected to the power input end according to a received adjustment signal, and outputs the processed voltage through the power output end.

[0006] A voltage sampling module is connected to the power output end, samples the voltage output by the power output end, and outputs a sampling voltage.

[0007] A control module is connected to the voltage sampling module and the step-up / down topology module, receives the sampling voltage, and outputs an adjustment signal to the step-up / down topology module.

[0008] In one embodiment, the step-up / down topology module includes a switch tube Q1, a switch tube Q2, a switch tube Q3, a switch tube Q4, and an inductor L1. The control ends of the switch tube Q1, the switch tube Q2, the switch tube Q3, and the switch tube Q4 are connected to the control module. The first end of the switch tube Q1 is connected to the power input end. The second end of the switch tube Q1 is connected to the first end of the inductor L1. The first end of the switch tube Q2 is connected to a ground end. The second end of the switch tube Q2 is connected to the first end of the inductor L1. The first end of the switch tube Q3 is connected to the ground end. The second end of the switch tube Q3 is connected to the second end of the inductor L1. The first end of the switch tube Q4 is connected to the second end of the inductor L1. The second end of the switch tube Q4 is connected to the power output end.

[0009] In one of the embodiments, the buck-boost topology module further comprises a capacitor unit C1 and a capacitor unit C2, a first end of the capacitor unit C1 is connected to a first end of the switch tube Q1 and the power input end, a second end of the capacitor unit C1 is connected to a ground end, a first end of the capacitor unit C2 is connected to a second end of the switch tube Q4 and the power output end, and a second end of the capacitor unit C2 is connected to the ground end.

[0010] In one of the embodiments, the switch tube Q1, the switch tube Q2, the switch tube Q3 and the switch tube Q4 are MOS tubes.

[0011] In one of the embodiments, the buck-boost topology module further comprises a first current sampling resistor and a second current sampling resistor, a first end of the switch tube Q2 is connected to the ground end through the first current sampling resistor, and a first end of the switch tube Q3 is connected to the ground end through the second current sampling resistor.

[0012] In one of the embodiments, the voltage sampling module comprises a resistor R6 and an electronic potentiometer, a first end of the resistor R6 is connected to a second end of the switch tube Q4 and the power output end, a second end of the resistor R6 is connected to a first end of the electronic potentiometer and the control module, and a second end of the electronic potentiometer is connected to the ground end.

[0013] In one of the embodiments, the power supply device further comprises:

[0014] a resistance adjusting module connected to the electronic potentiometer, for adjusting a resistance of the electronic potentiometer.

[0015] In one of the embodiments, the resistance adjusting module is an FPGA, an MCU or a CPU.

[0016] In one of the embodiments, the control module is a PWM controller outputting an adjusting signal with different duty cycles to the buck-boost topology module.

[0017] The second aspect of the present application provides a testing machine comprising the power supply device.

[0018] In one of the embodiments, the number of the power supply devices is more than two.

[0019] The power supply device and the test machine, the voltage sampling module samples the voltage output by the power supply output end, and outputs the sampling voltage. The control module receives the sampling voltage and the reference voltage, and outputs the adjustment signal to the boost-buck topology module. The boost-buck topology module can perform boost or buck processing according to the test requirement, expand the output voltage range of the power supply device, meet the test requirement of wide range output voltage, and improve the test convenience. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a structural block diagram of the power supply device in an embodiment.

[0021] Figure 2 It is a structural schematic diagram of the power supply device in an embodiment.

[0022] Figure 3 It is a duty cycle adjustment schematic diagram of the power supply device in an embodiment. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical scheme and advantages of the present application clearer, the present application will be further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0025] It can be understood that, in the following embodiments, "connection" between the circuits, modules, units, etc. connected to each other should be understood as "electrical connection", "communication connection" and the like if there is transmission of electrical signals or data between them.

[0026] As used herein, the singular forms "a", "an" and "the" can include plural forms unless the context clearly indicates otherwise. It should also be understood that the terms "comprise / comprising", "have / having" or "include / including" specify the presence of stated features, integers, operations, components, parts or combinations thereof, but do not exclude the presence or addition of one or more other features, integers, components, parts or combinations thereof. At the same time, the term "and / or" used in the specification includes any and all combinations of the related listed items.

[0027] In one embodiment, as Figure 1As shown, a power supply device is provided, including: a buck-boost topology module 110, a voltage sampling module 120, and a control module 130. The buck-boost topology module 110 is connected to the power input terminal and the power output terminal. It performs buck / boost processing on the voltage VIN input to the power input terminal according to a received adjustment signal, and outputs the processed voltage Vo through the power output terminal. The voltage sampling module 120 is connected to the power output terminal, samples the voltage Vo output from the power output terminal, and outputs a sampled voltage. The control module 130 is connected to the voltage sampling module 120 and the buck-boost topology module 110, receives the sampled voltage, and outputs an adjustment signal to the buck-boost topology module 110.

[0028] Specifically, according to actual needs, the control module 130 can send adjustment signals to the switching transistors in the buck-boost topology module 110 to control the on / off state of the switching transistors, thereby changing the operating mode of the buck-boost topology module 110 to meet the buck or boost requirements. The voltage sampling module 120 samples the voltage V output from the power supply output terminal. O Sampling is performed, and the sampled voltage is sent to the control module 130. The control module 130 compares the sampled voltage with the set reference voltage and changes the duty cycle of the adjustment signal according to the comparison result, thereby adjusting the output voltage amplitude of the buck-boost topology module 110. The reference voltage value can be changed according to actual needs to control the output voltage. The voltage output by the power supply is used to provide an excitation signal to the device under test (DUT) of the test machine for parameter testing. Specifically, the control module 130 outputs adjustment signals with different duty cycles to the PWM (Pulse Width Modulation) controller of the buck-boost topology module 110. The PWM controller can be a finished driver chip or a digital controller implemented through software logic. The PWM controller is mainly used to implement functions such as sampled voltage comparison, voltage regulation, and overcurrent protection.

[0029] It is understood that the structure of the buck-boost topology module 110 is not unique; in one embodiment, such as... Figure 2As shown, the boost-buck topology module 110 includes a switch tube Q1, a switch tube Q2, a switch tube Q3, a switch tube Q4, and an inductor L1. The control terminals of the switch tube Q1, the switch tube Q2, the switch tube Q3, and the switch tube Q4 are connected to the control module 130. The first terminal of the switch tube Q1 is connected to the power input terminal. The second terminal of the switch tube Q1 is connected to the first terminal of the inductor L1. The first terminal of the switch tube Q2 is connected to the ground terminal GND, which can be directly connected to the ground terminal GND or connected to the ground terminal GND through a current sampling resistor. The second terminal of the switch tube Q2 is connected to the first terminal of the inductor L1. The first terminal of the switch tube Q3 is connected to the ground terminal GND, which can be directly connected to the ground terminal GND or connected to the ground terminal GND through a current sampling resistor. The second terminal of the switch tube Q3 is connected to the second terminal of the inductor L1. The first terminal of the switch tube Q4 is connected to the second terminal of the inductor L1. The second terminal of the switch tube Q4 is connected to the power output terminal. The switch tube Q1, the switch tube Q2, the switch tube Q3, and the switch tube Q4 can be a triode, a MOS tube, or other control switch. In this embodiment, the switch tube Q1, the switch tube Q2, the switch tube Q3, and the switch tube Q4 are MOS tubes, the gate is the control terminal, the source is the first terminal, and the drain is the second terminal. The switch tube Q1 and the switch tube Q4 are P-channel MOS tubes, and the switch tube Q2 and the switch tube Q3 are N-channel MOS tubes.

[0030] In this embodiment, the boost-buck topology module 110 further includes a first current sampling resistor and a second current sampling resistor. The first terminal of the switch tube Q2 is connected to the ground terminal GND through the first current sampling resistor. The first terminal of the switch tube Q3 is connected to the ground terminal GND through the second current sampling resistor.

[0031] In addition, the boost-buck topology module 110 can further include a capacitor unit C1 and a capacitor unit C2. The first terminal of the capacitor unit C1 is connected to the first terminal of the switch tube Q1 and the power input terminal. The second terminal of the capacitor unit C1 is connected to the ground terminal GND. The first terminal of the capacitor unit C2 is connected to the second terminal of the switch tube Q4 and the power output terminal. The second terminal of the capacitor unit C2 is connected to the ground terminal GND. The input voltage is filtered by the capacitor unit C1, and the output voltage is filtered by the capacitor unit C2, thereby reducing the interference of spurs and improving the reliability of power supply. The capacitor unit C1 and the capacitor unit C2 can be a single capacitor or multiple parallel capacitors.

[0032] In one embodiment, continuing to refer to Figure 2The voltage sampling module 120 includes a resistor R6 and an electronic potentiometer R7. The first end of the resistor R6 is connected to the second end of the switch tube Q4 and the power supply output end. The second end of the resistor R6 is connected to the first end of the electronic potentiometer R7 and the control module 130. The second end of the electronic potentiometer R7 is connected to the ground end GND. The voltage Vo of the power supply output end is sampled by voltage division through the resistor R6 and the electronic potentiometer R7. The voltage division of the electronic potentiometer R7 is sent to the control module 130 as a sampling voltage. In addition, the power supply device further includes a resistance adjusting module 140 connected to the electronic potentiometer R7 to adjust the resistance of the electronic potentiometer R7. The resistance adjusting module 140 can be a functional device such as an FPGA (Field-Programmable Gate Array), an MCU (Microcontroller Unit), a CPU (Central Processing Unit), etc. The resistance of the electronic potentiometer R7 can be adjusted according to actual needs. The control module 130 compares the voltage division of the electronic potentiometer R7 with the set reference voltage, adjusts the signal duty cycle according to the comparison result, and thus changes the output voltage.

[0033] Specifically, in the boost-buck topology module 110, when the voltage VIN is less than the voltage Vo, the switch tube Q1, the inductor L1, the switch tube Q3, and the switch tube Q4 form a boost topology to achieve the purpose of voltage boost. When the voltage VIN is greater than the voltage Vo, the switch tube Q1, the switch tube Q2, the inductor L1, and the switch tube Q4 form a buck topology to achieve the purpose of voltage buck. By cooperating the boost-buck topology module 110 with the control module 130, real-time dynamic wide-range voltage output is achieved.

[0034] In the boost mode, the control module 130 controls the switch tube Q1 to be always on, the switch tube Q2 to be always off, and the switch tube Q3 and the switch tube Q4 to be complementary on according to the adjustment signal. According to the boost duty cycle formula of the switch tube Q3: Dboost=(1-Vin / Vo)*100%, in the case that the voltage Vin is constant, the voltage Vo can be changed to achieve different voltage outputs. The control module 130 adjusts the duty cycle of the adjustment signal after comparing the voltage division of the electronic potentiometer R7 with the reference voltage Ref. As shown in FIG. 6, the difference between the voltage division of the electronic potentiometer R7 and the reference voltage Ref is amplified by an internal operational amplifier of the control module 130, and then compared with an internal triangular wave to generate different duty cycles. Figure 3 If it is needed to increase the output voltage Vo, the resistance of the electronic potentiometer R7 is reduced. At this time, the voltage division of the electronic potentiometer R7 is reduced, and the difference between the voltage division and the reference voltage Ref is amplified and then compared with the triangular wave to generate a larger duty cycle. According to the boost duty cycle formula, the increase of the duty cycle can increase the output voltage Vo. Finally, the voltage division of the electronic potentiometer R7 is equal to the reference voltage Ref to achieve stability.

[0035] In the process of voltage reduction, the control module 130 controls the switch tube Q3 to be always off, the switch tube Q4 to be always on, and the switch tube Q1 and the switch tube Q2 to be turned on according to the adjustment signal. According to the voltage reduction duty cycle formula of the switch tube Q1: Dbuck = Vo*100% / Vin, the voltage regulation principle is also to change the duty cycle to achieve different voltage outputs, and the voltage regulation process is the same as that of the voltage increase.

[0036] The power supply device provided in the application, the voltage sampling module 120 samples the voltage output from the power supply output end and outputs the sampling voltage. The control module 130 receives the sampling voltage and the reference voltage, outputs the adjustment signal to the boost-buck topology module 110, and the boost-buck topology module 110 performs boost / voltage reduction processing on the voltage input from the power supply input end according to the received adjustment signal. The output voltage can be dynamically adjusted in real time according to the test requirement, the line power loss is reduced, the output voltage range of the power supply device is expanded, a wide range of output voltage is realized, the test requirement of a wide range of output voltage is met, the test convenience is improved, the cost is also reduced, and the circuit board space is saved.

[0037] In one embodiment, a test machine is also provided, which includes the power supply device described above. The number of power supply devices can be one, two or more. In the embodiment, the number of power supply devices is two or more, and each power supply device performs power boost / voltage reduction processing on one channel, so as to realize a low-ripple, multi-channel output voltage adjustable boost-buck power supply, and meet the wide range of output voltage requirements of the test machine.

[0038] The technical features of the above-described embodiments can be combined in any manner. To make the description concise, all possible combinations of the technical features in the above-described embodiments are not described, but as long as the combinations of the technical features do not exist, they should be considered as the scope of the description.

[0039] The above-described embodiments only express several implementation manners of the application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the utility model patent. It should be pointed out that for ordinary skilled persons in the art, without departing from the concept of the application, some modifications and improvements can be made, which are all within the protection scope of the application. Therefore, the protection scope of the patent of the application should be subject to the appended claims.

Claims

1. A power supply device, characterized in that, include: The step-up / step-down topology module connects the power input terminal and the power output terminal. It performs step-up / step-down processing on the voltage connected to the power input terminal according to the received adjustment signal, and outputs the processed voltage through the power output terminal. A voltage sampling module is connected to the power output terminal, samples the voltage output by the power output terminal, and outputs the sampled voltage. The control module is connected to the voltage sampling module and the buck-boost topology module, receives the sampled voltage, and outputs an adjustment signal to the buck-boost topology module; The buck-boost topology module includes switching transistors Q1, Q2, Q3, and Q4, and inductor L1. The control terminals of switching transistors Q1, Q2, Q3, and Q4 are all connected to the control module. The first terminal of switching transistor Q1 is connected to the power input terminal, the second terminal of switching transistor Q1 is connected to the first terminal of inductor L1, the first terminal of switching transistor Q2 is connected to the ground terminal, the second terminal of switching transistor Q2 is connected to the first terminal of inductor L1, the first terminal of switching transistor Q3 is connected to the ground terminal, the second terminal of switching transistor Q3 is connected to the second terminal of inductor L1, the first terminal of switching transistor Q4 is connected to the second terminal of inductor L1, and the second terminal of switching transistor Q4 is connected to the power output terminal. The voltage sampling module includes a resistor R6 and an electronic potentiometer. The first end of the resistor R6 is connected to the second end of the switching transistor Q4 and the power output terminal. The second end of the resistor R6 is connected to the first end of the electronic potentiometer and the control module. The second end of the electronic potentiometer is connected to the ground terminal.

2. The power supply device according to claim 1, characterized in that, The buck-boost topology module also includes capacitor unit C1 and capacitor unit C2. The first end of capacitor unit C1 is connected to the first end of the switching transistor Q1 and the power input terminal, and the second end of capacitor unit C1 is connected to the ground terminal. The first end of capacitor unit C2 is connected to the second end of the switching transistor Q4 and the power output terminal, and the second end of capacitor unit C2 is connected to the ground terminal.

3. The power supply device according to claim 1, characterized in that, The switching transistors Q1, Q2, Q3, and Q4 are all MOSFETs.

4. The power supply device according to claim 1, characterized in that, The buck-boost topology module also includes a first current sampling resistor and a second current sampling resistor. The first terminal of the switch Q2 is connected to the ground terminal through the first current sampling resistor, and the first terminal of the switch Q3 is connected to the ground terminal through the second current sampling resistor.

5. The power supply device according to claim 1, characterized in that, Also includes: A resistance adjustment module is connected to the electronic potentiometer to adjust the resistance of the electronic potentiometer.

6. The power supply device according to any one of claims 1-5, characterized in that, The control module is a PWM controller that outputs adjustment signals with different duty cycles to the buck-boost topology module.

7. A testing machine, characterized in that, Includes the power supply device according to any one of claims 1-6.

8. The testing machine according to claim 7, characterized in that, The number of power supply devices is two or more.

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