Power supply device and test machine

Abstract

The utility model relates to a power supply device and a test machine, the power supply device comprises a control module and a plurality of power supply output channels, and each power supply output channel comprises a digital-to-analog conversion unit, a driving unit, an output stage unit, a sampling unit and an analog-to-digital conversion unit; the digital-to-analog conversion unit receives the driving digital signal transmitted by the control module for digital-to-analog conversion and outputs a driving analog signal to the driving unit, and the driving unit amplifies the driving analog signal and then transmits the driving analog signal to a load through the output stage unit; the sampling unit carries out parameter sampling on a load through the output stage unit to obtain a sampling analog signal and transmits the sampling analog signal to the analog-to-digital conversion unit, the analog-to-digital conversion unit carries out analog-to-digital conversion on the sampling analog signal to obtain a sampling digital signal and transmits the sampling digital signal to the control module, and the control module adjusts an output driving digital signal according to the sampling digital signal. The feedback regulation of the output signal is realized, the output is ensured to meet the requirement, and the output reliability is improved.

Description

Technical Field

[0001] The present application relates to the field of semiconductor testing technology, and in particular to a power supply device and a testing machine. Background Art

[0002] With the development of the new energy industry, the demand for high-current testing of power semiconductors is growing. As an indispensable part of integrated circuit ATE (Automatic Test Equipment) testing, the VI (voltage and current) source is used to provide test excitation to the device under test. In order to meet these needs, the design of a high-current VI source is particularly important. The traditional VI source amplifies the output current of the high-voltage application line through the power amplifier part, and outputs the amplified output current through the high-voltage application line after the current is expanded. After the amplified output current is attenuated according to the set attenuation ratio by the current positive feedback part, a positive feedback current is provided to the power amplifier part, so that the VI source can obtain the amplified output current based on the attenuated current and the attenuation ratio. In this VI source, the current expansion circuit feedback and the VI source feedback are not directly connected, which is equivalent to two independent power supplies working in series. It is insufficient in dynamic response, output accuracy and loop stability, and has the disadvantage of low output reliability. Utility Model Content

[0003] Based on this, it is necessary to provide a power supply device and a tester that can improve output reliability in order to address the above problems.

[0004] A first aspect of the present application provides a power supply device, comprising a control module and a plurality of power output channels, wherein the power output channels comprise a digital-to-analog conversion unit, a drive unit, an output stage unit, a sampling unit, and an analog-to-digital conversion unit, wherein the digital-to-analog conversion unit is connected to the control module and the drive unit, the drive unit is connected to the output stage unit, the analog-to-digital conversion unit is connected to the control module and the sampling unit, the sampling unit is connected to the output stage unit, and the output stage unit is connected to a load;

[0005] The digital-to-analog conversion unit receives the driving digital signal transmitted by the control module and performs digital-to-analog conversion, and outputs a driving analog signal to the driving unit. The driving unit amplifies the driving analog signal and then drives the output stage unit to supply power to the load. The sampling unit samples the parameters of the load through the output stage unit, obtains a sampled analog signal and transmits it to the analog-to-digital conversion unit. The analog-to-digital conversion unit performs analog-to-digital conversion on the sampled analog signal, obtains a sampled digital signal and transmits it to the control module. The control module adjusts the output driving digital signal according to the sampled digital signal.

[0006] In one embodiment, the control module includes an instruction parsing unit, an operation control unit and an operation unit, the operation control unit is connected to the instruction parsing unit, and the operation control unit is connected to the digital-to-analog conversion unit and the analog-to-digital conversion unit in the corresponding power supply output channel through the operation unit; the instruction parsing unit parses the external instruction received and transmits the parsing result to the operation control unit, and the operation control unit controls the operation unit according to the parsing result to adjust the output drive digital signal according to the received sampled digital signal.

[0007] In one embodiment, the sampling unit includes a voltage sampling unit and a current sampling unit, the analog-to-digital conversion unit includes a voltage analog-to-digital conversion unit and a current analog-to-digital conversion unit, the voltage sampling unit is connected to the output stage unit and the voltage analog-to-digital conversion unit, the voltage analog-to-digital conversion unit is connected to the operation unit, the current sampling unit is connected to the output stage unit and the current analog-to-digital conversion unit, and the current analog-to-digital conversion unit is connected to the operation unit; the operation unit adjusts the output drive digital signal according to the voltage digital signal output by the voltage analog-to-digital conversion unit or the current digital signal output by the current analog-to-digital conversion unit.

[0008] In one embodiment, the operation unit includes a target value selection switch, a voltage loop processing unit, a current loop processing unit and a loop selection switch. The target value selection switch connects the operation control unit, the voltage loop processing unit and the current loop processing unit, and transmits the received voltage target value / clamp target value to the voltage loop processing unit, and transmits the received clamp target value / current target value to the current loop processing unit. The current loop processing unit is connected to the current analog-to-digital conversion unit in the corresponding power supply output channel. The voltage loop processing unit is connected to the voltage analog-to-digital conversion unit in the corresponding power supply output channel. The loop selection switch connects the voltage loop processing unit, the current loop processing unit and the digital-to-analog conversion unit in the corresponding power supply output channel, and sends the driving digital signal output by the voltage loop processing unit / the current loop processing unit to the digital-to-analog conversion unit.

[0009] In one embodiment, the voltage loop processing unit and the current loop processing unit both include a filter, a subtractor and an algorithm processing unit. In the voltage loop processing unit, the filter is connected to the voltage analog-to-digital conversion unit in the corresponding power supply output channel, the subtractor is connected to the target value selection switch, the filter and the algorithm processing unit, and the algorithm processing unit is connected to the loop selection switch; in the current loop processing unit, the filter is connected to the current analog-to-digital conversion unit in the corresponding power supply output channel, the subtractor is connected to the target value selection switch, the filter and the algorithm processing unit, and the algorithm processing unit is connected to the loop selection switch.

[0010] In one embodiment, the driving unit includes an operational amplifier U1, an operational amplifier U2, a resistor R1, a resistor R2, a resistor R3, a resistor R4 and a resistor R5, the non-inverting input terminal of the operational amplifier U1 is connected to the digital-to-analog conversion unit through the resistor R1, the inverting input terminal of the operational amplifier U1 is connected to the output terminal of the operational amplifier U1 through the resistor R2, the output terminal of the operational amplifier U1 is connected to the inverting input terminal of the operational amplifier U2 through the resistor R3, the inverting input terminal of the operational amplifier U2 is connected to the output stage unit through the resistor R4, the non-inverting input terminal of the operational amplifier U2 is grounded, and the output terminal of the operational amplifier U2 is connected to the output stage unit through the resistor R5.

[0011] In one embodiment, the output stage unit includes a switching tube, a diode, a resistor R6, a resistor R7 and a current sampling resistor. The first end of the switching tube is connected to the power supply bus, the second end of the switching tube is connected to the driving unit, the anode of the diode and the first end of the resistor R6, the third end of the switching tube is connected to the driving unit, the cathode of the diode is connected to the first end of the load through the high potential application line HF, the second end of the resistor R6 is connected to the first input end of the voltage sampling unit and connected to the first end of the load through the high potential detection line HS, the first end of the resistor R7 is connected to the second input end of the voltage sampling unit and connected to the second end of the load through the low potential detection line LS, the second end of the resistor R7 is connected to the second end of the load through the low potential application line LF, the first end of the current sampling resistor is connected to the second end of the resistor R7 and the first input end of the current sampling unit, and the second end of the current sampling resistor is grounded and connected to the second input end of the current sampling unit.

[0012] In one embodiment, the output stage unit further includes a fuse and a capacitor, the first end of the switch tube is connected to the power supply bus through the fuse, one end of the capacitor is connected to the power supply bus, and the other end of the capacitor is grounded.

[0013] In one embodiment, the power output channel further includes an alarm unit, which is connected to the output stage unit and the control module; the alarm unit monitors the status parameters of the output stage unit and outputs an alarm signal to the control module when the status parameters meet the corresponding alarm conditions; after receiving the enable signal sent by the control module, the alarm unit controls the output stage unit to shut down.

[0014] In one embodiment, the output stage unit further includes a switch K4, a first end of the switch K4 is connected to the third end of the switch tube in the output stage unit, a second end of the switch K4 is connected to the second end of the switch tube in the output stage unit, and a control end of the switch K4 is connected to the alarm unit; and / or, the alarm unit is further connected to the first end of the current sampling resistor in the output stage unit and to the power supply bus.

[0015] A second aspect of the present application provides a testing machine, comprising the above-mentioned power supply device.

[0016] The above-mentioned power supply device and test machine, the power supply device includes a control module and several power output channels, the power output channels include a digital-to-analog conversion unit, a drive unit, an output stage unit, a sampling unit and an analog-to-digital conversion unit; the digital-to-analog conversion unit receives the drive digital signal transmitted by the control module for digital-to-analog conversion, and outputs the drive analog signal to the drive unit, the drive unit amplifies the drive analog signal and transmits it to the load through the output stage unit; the sampling unit samples the parameters of the load through the output stage unit, obtains the sampled analog signal and transmits it to the analog-to-digital conversion unit, the analog-to-digital conversion unit performs analog-to-digital conversion on the sampled analog signal, obtains the sampled digital signal and transmits it to the control module, the control module adjusts the output drive digital signal according to the sampled digital signal, realizes feedback adjustment of the output signal, ensures that the output meets the requirements, and improves the output reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a structural block diagram of a power supply device in one embodiment;

[0018] Figure 2 is a schematic structural diagram of a power supply device in one embodiment;

[0019] Figure 3 is a schematic structural diagram of a power supply device in another embodiment;

[0020] Figure 4 A schematic diagram of signal conditioning of a computing unit in one embodiment;

[0021] Figure 5 FIG. 4 is a schematic structural diagram of a driving unit and an output stage unit in one embodiment. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application.

[0024] It can be understood that the “connection” in the following embodiments should be understood as “electrical connection”, “communication connection”, etc. if there is transmission of electrical signals or data between the connected circuits, modules, units, etc.

[0025] When used herein, the singular forms "a", "an", and "the" may also include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" and the like specify the presence of stated features, integers, operations, components, parts, or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, integers, operations, components, parts, or combinations thereof.

[0026] In one embodiment, Figure 1 As shown, a power supply device is provided, including a control module 100 and several power output channels 200, the power output channels 200 including a digital-to-analog conversion unit 210, a drive unit 220, an output stage unit 230, a sampling unit 240 and an analog-to-digital conversion unit 250, the digital-to-analog conversion unit 210 is connected to the control module 100 and the drive unit 220, the drive unit 220 is connected to the output stage unit 230, the analog-to-digital conversion unit 250 is connected to the control module 100 and the sampling unit 240, the sampling unit 240 is connected to the output stage unit 230, and the output stage unit 230 is connected to a load. The digital-to-analog conversion unit 210 receives the driving digital signal transmitted by the control module 100 and performs digital-to-analog conversion, and outputs the driving analog signal to the driving unit 220. The driving unit 220 amplifies the driving analog signal and drives the output stage unit 230 to supply power to the load; the sampling unit 240 samples the parameters of the load through the output stage unit 230, and obtains a sampled analog signal and transmits it to the analog-to-digital conversion unit 250. The analog-to-digital conversion unit 250 performs analog-to-digital conversion on the sampled analog signal, obtains a sampled digital signal and transmits it to the control module 100. The control module 100 adjusts the output driving digital signal according to the sampled digital signal.

[0027] The load can be a test product such as a semiconductor chip, and the power output channel 200 can specifically be a VI source output channel. The number of power output channels 200 can be one or more, and the specific number can be automatically or manually configured according to actual needs. The control module 100 can be a device such as an FPGA, a CPU, or an MCU. In this embodiment, the control module 100 is an FPGA. The control module 100 can communicate with a host computer, receive external instructions, analyze and determine operating parameters, and adjust the driving digital signal output to the digital-to-analog conversion unit 210 based on the operating parameters and the collected sampled digital signals. Furthermore, the power output channel 200 can also include an alarm unit 270, which is connected to the output stage unit 230 and the control module 100. The alarm unit 270 monitors the status parameters of the output stage unit 230 and outputs an alarm signal to the control module 100 when the status parameters meet the corresponding alarm conditions. After receiving the enable signal sent by the control module 100, the alarm unit 270 controls the output stage unit 230 to shut down. Among them, the state parameters may include temperature, voltage, current, etc. When the alarm unit 270 determines that a state parameter is greater than the corresponding set threshold, it sends an alarm signal to the control module 100, and after receiving the enable signal sent by the control module 100, it shuts down the output stage unit 230, so that the output stage unit 230 is not controlled by the drive unit 220 and does not output a signal to the load.

[0028] like Figure 2 As shown, the power supply output channel 200 includes channels 1 to n. The digital-to-analog conversion unit 210, analog-to-digital conversion unit 250, and alarm unit 270 in each channel are connected to the control module 100, and the output stage unit 230 is connected to the load. The digital-to-analog conversion unit 210 is constructed based on a digital-to-analog conversion chip and converts the transmitted driving digital signal into a driving analog signal. The driving unit 220 receives the driving analog signal output by the digital-to-analog conversion unit 210, amplifies it, and then drives the output stage unit 230 for output. The sampling unit 240 may include a voltage sampling unit and / or a current sampling unit, converting the output voltage / output current of the output stage unit 230 into a voltage within the input range of the analog-to-digital conversion unit 250 and outputting a sampled analog signal. The analog-to-digital conversion unit 250 is constructed based on an analog-to-digital conversion chip and converts the sampled analog signal output by the sampling unit 240 into a sampled digital signal and transmits it to the control module 100. The alarm unit 270 samples the voltage, current, temperature and other status parameters of the output stage unit 230. If any status parameter exceeds the threshold, it outputs a corresponding alarm signal to the control module 100, receives the enable signal of the control module 100, and outputs an enable control signal to the output stage unit 230 to control the output stage unit 230 to shut down.

[0029] In one embodiment, Figure 3As shown, the control module 100 includes an instruction parsing unit 110, an operation control unit 120, and an operation unit 130. The operation control unit 120 is connected to the instruction parsing unit 110, and the operation control unit 120 is connected to the digital-to-analog conversion unit 210 and the analog-to-digital conversion unit 250 in the corresponding power output channel through the operation unit 130. The instruction parsing unit 110 parses the external instruction received and transmits the parsing result to the operation control unit 120. The operation control unit 120 controls the operation unit 130 based on the parsing result to adjust the output drive digital signal according to the received sampled digital signal.

[0030] The operation control unit 120 may determine the operating mode based on the analysis results, configure the operating parameters and switch the operation unit 130 so that the operation unit 130 performs feedback adjustment according to the corresponding operating mode. The operating mode may include a voltage loop mode, a current loop mode, etc., and the operating parameters may include a voltage target value, a current target value, a clamping target value, etc. Furthermore, the control module 100 may also include a control unit 140, and the operation control unit 120 is connected to the alarm unit 270 in the corresponding power output channel through the control unit 140. The control unit 140 is connected to the alarm unit 270 in the power output channel, receives the alarm signal from the alarm unit 270, and sends an enable signal to the alarm unit 270.

[0031] In one embodiment, Figure 4 As shown, the sampling unit 240 includes a voltage sampling unit 242 and a current sampling unit 244, and the analog-to-digital conversion unit 250 includes a voltage analog-to-digital conversion unit 252 and a current analog-to-digital conversion unit 254. The voltage sampling unit 242 is connected to the output stage unit 230 and the voltage analog-to-digital conversion unit 252, and the voltage analog-to-digital conversion unit 252 is connected to the operation unit 130. The current sampling unit 244 is connected to the output stage unit 230 and the current analog-to-digital conversion unit 254, and the current analog-to-digital conversion unit 254 is connected to the operation unit 130. The operation unit 130 adjusts the output drive digital signal according to the voltage digital signal output by the voltage analog-to-digital conversion unit 252 or the current digital signal output by the current analog-to-digital conversion unit 254.

[0032] Furthermore, if Figure 4As shown, the operation unit 130 includes a target value selection switch K1, a voltage loop processing unit 132, a current loop processing unit 134 and a loop selection switch K2. The target value selection switch K1 connects the operation control unit 120, the voltage loop processing unit 132 and the current loop processing unit 134, and transmits the received voltage target value / clamp target value to the voltage loop processing unit 132, and transmits the received clamp target value / current target value to the current loop processing unit 134. The current loop processing unit 134 is connected to the current analog-to-digital conversion unit 254 in the corresponding power output channel, and the voltage loop processing unit 132 is connected to the voltage analog-to-digital conversion unit 252 in the corresponding power output channel. The loop selection switch K2 connects the voltage loop processing unit 132, the current loop processing unit 134 and the digital-to-analog conversion unit 210 in the corresponding power output channel, and sends the driving digital signal output by the voltage loop processing unit 132 / current loop processing unit 134 to the digital-to-analog conversion unit 210.

[0033] The voltage loop processing unit 132 is similar to the current loop processing unit 134, both including a filter, a subtractor, and an algorithm processing unit. In the voltage loop processing unit 132, the filter is connected to the voltage analog-to-digital conversion unit 252 in the corresponding power output channel, the subtractor is connected to the target value selection switch K1, the filter, and the algorithm processing unit, which is then connected to the loop selection switch K2. In the current loop processing unit 134, the filter is connected to the current analog-to-digital conversion unit 254 in the corresponding power output channel, the subtractor is connected to the target value selection switch K1, the filter, and the algorithm processing unit, which is then connected to the loop selection switch K2. The target value selection switch K1 includes two switches: one of which is connected to the subtractor in the voltage loop processing unit 132 and receives the voltage target value / clamp target value, and the other is connected to the subtractor in the current loop processing unit 134 and receives the clamp target value / current target value.

[0034] Specifically, the feedback loop of each power supply output channel includes a voltage loop and a current loop. The target value input of the current loop is a current target value or a clamping target value. The feedback of the current loop is the current sampling of the output stage unit 230. After conversion by the current analog-to-digital conversion unit 254 and filtering by the current loop processing unit 134, the current is processed with the target value input of the current loop by an algorithm. The processing result is output to the digital-to-analog conversion unit 210, converted into an analog voltage, and input as a driving analog signal to the driver unit 220, which then drives the output of the output stage unit 230. The target value input of the voltage loop is a voltage target value or a clamping target value. The feedback of the voltage loop is the voltage sampling of the output stage unit 230. After conversion by the voltage analog-to-digital conversion unit 252 and filtering by the voltage loop processing unit 132, the current is processed with the target value input of the voltage loop by an algorithm. The processing result is output to the digital-to-analog conversion unit 210, converted into an analog voltage, and input as a driving analog signal to the driver unit 220, which then drives the output of the output stage unit 230.

[0035] like Figure 4 As shown in the figure, the target input values ​​for the voltage and current loops are selected by the target value selection switch K1. Each channel output has two output modes: constant voltage clamp current and constant current clamp voltage. The current target value, voltage target value, and clamp target value must be set. If the constant current clamp voltage output mode is selected for the channel output, the current loop input selects the current target value, and the voltage loop input selects the clamp target value. If the constant voltage clamp current output mode is selected for the channel output, the clamp target value is selected for the current loop input, and the voltage loop input selects the current target value.

[0036] The input of the digital-to-analog converter unit 210 is selected by the loop selection switch K2. In the constant current clamping mode, the loop selection switch K2 first selects the current loop. The current target value is subtracted from the current sampling feedback value. After the difference is processed by the algorithm, the output of the digital-to-analog converter unit 210 is controlled. Then, the output current of the output stage unit 230 is controlled by the driver unit 220 to reach the current target value. If the voltage sampling feedback value exceeds the clamping target value, the loop selection switch K2 switches to the voltage loop. The clamping target value is subtracted from the voltage sampling feedback value. After the difference is processed by the algorithm, the output of the digital-to-analog converter unit 210 is controlled. Then, the output voltage of the output stage unit 230 is controlled by the driver unit 220 to remain at the clamping target value.

[0037] Similarly, in the constant voltage clamping mode, the loop selection switch K2 first selects the voltage loop, and the voltage target value is subtracted from the voltage sampling feedback value. After the difference is processed by the algorithm, the output of the digital-to-analog conversion unit 210 is controlled, and then the output voltage of the output stage unit 230 is controlled by the driver unit 220 to reach the voltage target value. If the current sampling feedback value exceeds the clamping target value, the loop selection switch K2 switches to the current loop, and the clamping target value is subtracted from the current sampling feedback value. After the difference is processed by the algorithm, the output of the digital-to-analog conversion unit 210 is controlled, and then the output current of the output stage unit 230 is controlled by the driver unit 220 to remain at the clamping target value.

[0038] The specific structure of the driving unit 220 is not unique. In one embodiment, Figure 5 As shown, the driving unit 220 includes an operational amplifier U1, an operational amplifier U2, a resistor R1, a resistor R2, a resistor R3, a resistor R4 and a resistor R5. The non-inverting input terminal + of the operational amplifier U1 is connected to the digital-to-analog conversion unit 210 through the resistor R1, the inverting input terminal - of the operational amplifier U1 is connected to the output terminal of the operational amplifier U1 through the resistor R2, the output terminal of the operational amplifier U1 is connected to the inverting input terminal - of the operational amplifier U2 through the resistor R3, the inverting input terminal - of the operational amplifier U2 is connected to the output stage unit 230 through the resistor R4, the non-inverting input terminal + of the operational amplifier U2 is grounded, and the output terminal of the operational amplifier U2 is connected to the output stage unit 230 through the resistor R5.

[0039] The output gain of the operational amplifier U2 of the driving unit 220 is determined by the ratio between the resistors R4 and R3. The output voltage of the digital-to-analog conversion unit 210 is recorded as Vset. It passes through the operational amplifier U1 to the operational amplifier U2. The operational amplifier U1 is a proportional operational amplifier. The second-stage voltage Vs of the switch tube Q1 is: V S =-Vset*R4 / R3.

[0040] Furthermore, the output stage unit 230 includes a switch tube Q1, a diode D1, a resistor R6, a resistor R7 and a current sampling resistor R S The first end of the switch tube Q1 is connected to the power supply bus Vbus, the second end of the switch tube Q1 is connected to the drive unit 220, the anode of the diode D1 and the first end of the resistor R6, the third end of the switch tube Q1 is connected to the drive unit 220, the cathode of the diode D1 is connected to the first end of the load through the high potential application line HF, the second end of the resistor R6 is connected to the first input end of the voltage sampling unit 242, and is connected to the first end of the load through the high potential detection line HS, the first end of the resistor R7 is connected to the second input end of the voltage sampling unit 242, and is connected to the second end of the load through the low potential detection line LS, the second end of the resistor R7 is connected to the second end of the load through the low potential application line LF, the current sampling resistor R SThe first end of the current sampling resistor R is connected to the second end of the resistor R7 and the first input end of the current sampling unit 244. S The second end of is grounded and connected to the second input of the current sampling unit 244. The current sampling resistor Rs is used to sample the output current and convert it into a voltage signal. The diode D1 is used to protect the output terminal to prevent external current from flowing back and damaging the output stage. The high potential application line HF, the high potential detection line HS, the low potential detection line LS, and the low potential application line LF can be wires alone or with switches connected in series.

[0041] The output stage unit 230 may further include a switch K4 , wherein a first end of the switch K4 is connected to the third end of the switch tube Q1 , a second end of the switch K4 is connected to the second end of the switch tube Q1 , and a control end of the switch K4 is connected to the alarm unit 270 .

[0042] Among them, the power supply bus Vbus provides the power bus voltage for the output stage, and the switch tube Q1 can be a controlled switch such as a triode or a MOS tube. The second end of the switch tube Q1 is specifically connected to the resistor R4 in the drive unit 220, and the third end of the switch tube Q1 is specifically connected to the resistor R5 in the drive unit 220. The output stage unit 230 may also include a fuse F1 and a capacitor Cbus. The first end of the switch tube Q1 is connected to the power supply bus Vbus through the fuse F1, one end of the capacitor Cbus is connected to the power supply bus Vbus, and the other end of the capacitor Cbus is grounded. The fuse F1 is used to protect the output stage power circuit and will melt when the output is overcurrent for a long time. The alarm unit 270 is also connected to the current sampling resistor R S The first end of the bus and the power supply bus are used for overcurrent detection and bus voltage detection.

[0043] In addition, the output stage unit 230 may also include a temperature sensor connected to the alarm unit 270 to detect the output stage temperature. The alarm unit 270 is connected to the switch K4. When it detects that the temperature value, voltage value, and current value exceed the threshold value, the alarm unit 270 outputs an enable control signal to the switch K4, which can control the closing of the switch K4. When the switch K4 is closed, the second and third poles of the switch tube Q1 are short-circuited through the switch K4, the switch tube Q1 is turned off, and is no longer controlled by the drive unit 220, and the output stage is disabled. Of course, according to the design, in normal mode, the switch K4 is disconnected, the switch tube Q1 is controlled by the drive unit 220 to work, and the output voltage is transmitted to the diode D1 and the resistor R6 to the load and the resistor R7 and the current sampling resistor Rs.

[0044] Of course, designers in this field will appreciate that the alarm unit 270 controls the switch tube Q1 to turn off based on the alarm information, and the output stage disabling method is not limited thereto.

[0045] In one embodiment, the output stage unit 230 includes a temperature sensor and a switch K4 connected to an alarm unit 270. The temperature sensor is used to detect the output stage temperature. The alarm unit 270 is connected to the switch K4, and the alarm unit 270 is disconnected from the first end of the current sampling resistor RS and the power bus. When the temperature value is detected to exceed a threshold, the alarm unit 270 outputs an enable control signal to the switch K4, controlling the closure of the switch K4. When the switch K4 is closed, the second and third terminals of the switch Q1 are short-circuited through the switch K4, turning off the switch Q1 and removing it from the control of the driver unit 220, thus disabling the output stage.

[0046] In one embodiment, the output stage unit 230 includes a temperature sensor connected to an alarm unit 270 to detect the output stage temperature. The alarm unit 270 is connected to the first end of the current sampling resistor RS and the power bus to perform overcurrent detection and bus voltage detection. When the temperature, voltage, or current values ​​detected exceed a threshold, the alarm unit 270 controls the first end of the switch Q1 to disconnect from the power bus Vbus, thereby shutting down the switch Q1, removing it from control by the drive unit 220, and disabling the output stage. All of the above embodiments can achieve the purpose of the alarm unit 270 controlling the switch Q1 to shut down.

[0047] The output end of the output stage unit 230 is a Kelvin four-wire connection, connected to the load through a high potential application line HF, a high potential detection line HS, a low potential application line LF, and a low potential detection line LS. The high potential application line HF and the high potential detection line HS are connected to the first end of the load, and the low potential application line LF and the low potential detection line LS are connected to the second end of the load. The two ends of the resistor R6 are connected to the high potential application line HF and the high potential detection line HS, and the two ends of the resistor R7 are connected to the low potential application line LF and the low potential detection line LS. This is used to prevent the output end from being unloaded (no load condition), causing the high potential application line HF, the high potential detection line HS, the low potential application line LF, and the low potential detection line LS to be suspended, resulting in abnormal voltage sampling.

[0048] In one embodiment, a test machine is provided, comprising the aforementioned power supply device. The test machine may further include a host computer connected to the control module, which communicates with the control module to issue commands. The host computer may be, but is not limited to, various personal computers, laptops, smartphones, tablet computers, and portable wearable devices. The portable wearable devices may be smart watches, smart bracelets, head-mounted devices, and the like.

[0049] Specifically, the host computer communicates with the control module to send target values ​​and channel selections. The target values ​​are current target values, voltage target values, and clamping target values. The channel selection is manual configuration of output channels or automatic configuration of output channels. Manual configuration of output channels means manually selecting a specific channel from the 1-n channels for output.

[0050] The above power supply device and test machine have the following advantages:

[0051] 1. Multi-channel VI sources can break through link impedance limitations, reduce link loss, and apply larger current test stimulus to the test product with larger link impedance.

[0052] 2. The VI source loop is a parallel type, and the output loops of each channel are independent and do not interfere with each other, which will increase the output stability and accuracy.

[0053] 3. The VI source current is more detectable. Since the resolution and accuracy of a large current probe are not high, a small current probe with higher resolution and accuracy can be used to measure each channel separately and finally sum the results to obtain the total current.

[0054] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0055] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that a person skilled in the art could make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A power supply device, characterized in that: The power supply output channel includes a control module and several power supply output channels, wherein the power supply output channel includes a digital-to-analog conversion unit, a drive unit, an output stage unit, a sampling unit, and an analog-to-digital conversion unit. The digital-to-analog conversion unit is connected to the control module and the drive unit, the drive unit is connected to the output stage unit, the analog-to-digital conversion unit is connected to the control module and the sampling unit, the sampling unit is connected to the output stage unit, and the output stage unit is connected to a load. The digital-to-analog conversion unit receives the driving digital signal transmitted by the control module and performs digital-to-analog conversion, and outputs a driving analog signal to the driving unit. The driving unit amplifies the driving analog signal and then drives the output stage unit to supply power to the load. The sampling unit samples the parameters of the load through the output stage unit, obtains a sampled analog signal and transmits it to the analog-to-digital conversion unit. The analog-to-digital conversion unit performs analog-to-digital conversion on the sampled analog signal, obtains a sampled digital signal and transmits it to the control module. The control module adjusts the output driving digital signal according to the sampled digital signal.

2. The device according to claim 1, characterized in that The control module includes an instruction parsing unit, an operation control unit and an operation unit, the operation control unit is connected to the instruction parsing unit, and the operation control unit is connected to the digital-to-analog conversion unit and the analog-to-digital conversion unit in the corresponding power supply output channel through the operation unit; the instruction parsing unit parses the external instruction received and transmits the parsing result to the operation control unit, and the operation control unit controls the operation unit according to the parsing result to adjust the output drive digital signal according to the received sampled digital signal.

3. The device according to claim 2, characterized in that The sampling unit includes a voltage sampling unit and a current sampling unit, and the analog-to-digital conversion unit includes a voltage analog-to-digital conversion unit and a current analog-to-digital conversion unit. The voltage sampling unit is connected to the output stage unit and the voltage analog-to-digital conversion unit, and the voltage analog-to-digital conversion unit is connected to the operation unit. The current sampling unit is connected to the output stage unit and the current analog-to-digital conversion unit, and the current analog-to-digital conversion unit is connected to the operation unit. The operation unit adjusts the output drive digital signal according to the voltage digital signal output by the voltage analog-to-digital conversion unit or the current digital signal output by the current analog-to-digital conversion unit.

4. The device according to claim 3, characterized in that The operation unit includes a target value selection switch, a voltage loop processing unit, a current loop processing unit and a loop selection switch. The target value selection switch connects the operation control unit, the voltage loop processing unit and the current loop processing unit, and transmits the received voltage target value / clamp target value to the voltage loop processing unit, and transmits the received clamp target value / current target value to the current loop processing unit. The current loop processing unit is connected to the current analog-to-digital conversion unit in the corresponding power output channel, and the voltage loop processing unit is connected to the voltage analog-to-digital conversion unit in the corresponding power output channel. The loop selection switch connects the voltage loop processing unit, the current loop processing unit and the digital-to-analog conversion unit in the corresponding power output channel, and sends the driving digital signal output by the voltage loop processing unit / the current loop processing unit to the digital-to-analog conversion unit.

5. The device according to claim 4, characterized in that The voltage loop processing unit and the current loop processing unit both include a filter, a subtractor, and an algorithm processing unit. In the voltage loop processing unit, the filter is connected to the voltage analog-to-digital conversion unit in the corresponding power supply output channel, the subtractor is connected to the target value selection switch, the filter, and the algorithm processing unit, and the algorithm processing unit is connected to the loop selection switch; in the current loop processing unit, the filter is connected to the current analog-to-digital conversion unit in the corresponding power supply output channel, the subtractor is connected to the target value selection switch, the filter, and the algorithm processing unit, and the algorithm processing unit is connected to the loop selection switch.

6. The device according to claim 1, characterized in that The driving unit includes an operational amplifier U1, an operational amplifier U2, a resistor R1, a resistor R2, a resistor R3, a resistor R4 and a resistor R5. The non-inverting input terminal of the operational amplifier U1 is connected to the digital-to-analog conversion unit through the resistor R1, the inverting input terminal of the operational amplifier U1 is connected to the output terminal of the operational amplifier U1 through the resistor R2, the output terminal of the operational amplifier U1 is connected to the inverting input terminal of the operational amplifier U2 through the resistor R3, the inverting input terminal of the operational amplifier U2 is connected to the output stage unit through the resistor R4, the non-inverting input terminal of the operational amplifier U2 is grounded, and the output terminal of the operational amplifier U2 is connected to the output stage unit through the resistor R5.

7. The device according to claim 3, characterized in that The output stage unit includes a switching tube, a diode, a resistor R6, a resistor R7 and a current sampling resistor. The first end of the switching tube is connected to the power supply bus, the second end of the switching tube is connected to the drive unit, the anode of the diode and the first end of the resistor R6, the third end of the switching tube is connected to the drive unit, the cathode of the diode is connected to the first end of the load through the high potential application line HF, the second end of the resistor R6 is connected to the first input end of the voltage sampling unit and the first end of the load through the high potential detection line HS, the first end of the resistor R7 is connected to the second input end of the voltage sampling unit and the second end of the load through the low potential detection line LS, the second end of the resistor R7 is connected to the second end of the load through the low potential application line LF, the first end of the current sampling resistor is connected to the second end of the resistor R7 and the first input end of the current sampling unit, and the second end of the current sampling resistor is grounded and connected to the second input end of the current sampling unit.

8. The device according to claim 7, characterized in that The output stage unit further includes a fuse and a capacitor. The first end of the switch tube is connected to the power supply bus through the fuse, one end of the capacitor is connected to the power supply bus, and the other end of the capacitor is grounded.

9. The device according to any one of claims 1 to 8, characterized in that The power output channel also includes an alarm unit, which is connected to the output stage unit and the control module; the alarm unit monitors the status parameters of the output stage unit and outputs an alarm signal to the control module when the status parameters meet the corresponding alarm conditions. After receiving the enable signal sent by the control module, the alarm unit controls the output stage unit to shut down.

10. The device according to claim 9, characterized in that The output stage unit further includes a switch K4, a first end of the switch K4 being connected to the third end of the switch tube in the output stage unit, a second end of the switch K4 being connected to the second end of the switch tube in the output stage unit, and a control end of the switch K4 being connected to the alarm unit; and / or the alarm unit is further connected to the first end of the current sampling resistor in the output stage unit and to the power supply bus.

11. A testing machine, characterized in that: A power supply device comprising any one of claims 1 to 10.

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