具体实施方式detailed description

以下通过特定的具体实例说明本发明的实施方式，本领域技术人员可由本说明书所揭露的内容轻易地了解本发明的其他优点与功效。本发明还可以通过另外不同的具体实施方式加以实施或应用，本说明书中的各项细节也可以基于不同观点与应用，在没有背离本发明的精神下进行各种修饰或改变。Embodiments of the present invention are described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes, and various modifications or changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention.

请参阅图1～图3。需要说明的是，本实施例中所提供的图示仅以示意方式说明本发明的基本构想，遂图式中仅显示与本发明中有关的组件而非按照实际实施时的组件数目、形状及尺寸绘制，其实际实施时各组件的型态、数量及比例可为一种随意的改变，且其组件布局型态也可能更为复杂。Please refer to Figure 1 to Figure 3. It should be noted that the diagrams provided in this embodiment are only schematically illustrating the basic idea of the present invention, and only the components related to the present invention are shown in the diagrams rather than the number, shape and shape of the components in actual implementation. Dimensional drawing, the type, quantity and proportion of each component can be changed arbitrarily during actual implementation, and the component layout type may also be more complicated.

实施例一Embodiment one

如图1所示，本发明提供一种电压电流测试自动切换电路1，所述电压电流测试自动切换电路至少包括1：As shown in Figure 1, the present invention provides a voltage and current test automatic switching circuit 1, the voltage and current test automatic switching circuit at least includes 1:

脉冲电流源模块11，上位机12、单电源电平转换模块13、微处理模块14、开关驱动模块15、测试状态切换模块16及接口模块17。Pulse current source module 11 , upper computer 12 , single power level conversion module 13 , microprocessing module 14 , switch drive module 15 , test state switching module 16 and interface module 17 .

如图1所示，所述脉冲电流源模块11接收负直流电流信号及单脉冲电压信号，在所述单脉冲电压信号的驱动下所述负直流电流信号转化为所述单脉冲电流信号。As shown in FIG. 1 , the pulse current source module 11 receives a negative direct current signal and a single pulse voltage signal, and the negative direct current signal is converted into the single pulse current signal driven by the single pulse voltage signal.

具体地，在本实施例中，所述脉冲电流源模块11包括第一输入端Rext1、第二输入端Rext2、第一输出端Idata1、第二输出端Idata2、驱动端Data，使能端En、电源端Vdd及地端Gnd，其中，第一输入端Rext1及第二输入端Rext2分别接收负直流电流，驱动端Data接收单脉冲电压信号，并于第一输出端Idata1及第二输出端Idata2产生单脉冲电流信号；电源端Vdd连接电源电压，设定为2.6V～6.5V，在本实施例中，所述电源电压设定为5V；在本实施例中，使能端En在高电平时起效，高电平设定为所述电源电压；地端Gnd接地；在本实施例中，仅需要使用一路单脉冲电流信号，因此，第二输入端Rext2接地，第二输出端Idata2悬空。负直流电流信号基于单脉冲电压信号得到单脉冲电流信号，一个输入电流对应一个输出电流，以此确保输出脉冲电流源的稳定性，Specifically, in this embodiment, the pulse current source module 11 includes a first input terminal Rext1, a second input terminal Rext2, a first output terminal Idata1, a second output terminal Idata2, a driving terminal Data, an enabling terminal En, The power supply terminal Vdd and the ground terminal Gnd, wherein the first input terminal Rext1 and the second input terminal Rext2 respectively receive negative DC current, and the driving terminal Data receives a single pulse voltage signal, which is generated at the first output terminal Idata1 and the second output terminal Idata2 Single pulse current signal; the power supply terminal Vdd is connected to the power supply voltage and is set to 2.6V～6.5V. In this embodiment, the power supply voltage is set to 5V; in this embodiment, when the enable terminal En is at a high level To take effect, the high level is set as the power supply voltage; the ground terminal Gnd is grounded; in this embodiment, only one single pulse current signal needs to be used, therefore, the second input terminal Rext2 is grounded, and the second output terminal Idata2 is suspended. The negative DC current signal is based on a single pulse voltage signal to obtain a single pulse current signal, one input current corresponds to one output current, so as to ensure the stability of the output pulse current source,

更具体地，单脉冲电压信号控制单脉冲电流信号的开启和关闭，以形成脉冲信号，当所述单脉冲电压为高电平时，单脉冲电流信号开启；当所述单脉冲电压信号为低电平时，所述单脉冲电流信号关闭，进而确定所述单脉冲电流信号的脉冲宽度。所述单脉冲电流信号的脉冲宽度与所述单脉冲电压信号的脉冲宽度相同。通过设定所述单脉冲电压信号的脉冲宽度来得到预设的单脉冲电流信号的脉冲宽度，在本实施例中，所述单脉冲电压信号为纳秒级电压脉冲，其控制频率设定为10MHz，脉冲宽度为200ns。More specifically, the single-pulse voltage signal controls the opening and closing of the single-pulse current signal to form a pulse signal. When the single-pulse voltage is high, the single-pulse current signal is turned on; when the single-pulse voltage signal is low Normally, the single pulse current signal is turned off, and then the pulse width of the single pulse current signal is determined. The pulse width of the single pulse current signal is the same as the pulse width of the single pulse voltage signal. The pulse width of the preset single pulse current signal is obtained by setting the pulse width of the single pulse voltage signal. In this embodiment, the single pulse voltage signal is a nanosecond voltage pulse, and its control frequency is set to 10MHz with a pulse width of 200ns.

更具体地，所述单脉冲电流信号的大小与所述负直流电流信号的大小有关，可通过比值的设定得到预设的输出电流值，在本实施例中，所述单脉冲电流信号的大小与所述负直流电流信号的大小比值为4：1。可根据不同的需要设定比值，不以本实施例为限。More specifically, the magnitude of the single pulse current signal is related to the magnitude of the negative direct current signal, and the preset output current value can be obtained by setting the ratio. In this embodiment, the magnitude of the single pulse current signal The ratio of the magnitude to the magnitude of the negative direct current signal is 4:1. The ratio can be set according to different needs, and is not limited to this embodiment.

在本实施例中，所述脉冲电流源模块11输出的单脉冲电流信号的电流可高至10mA，输出脉冲宽度低至100ns，适于PCRAM器件单元的电流测试分析。所述脉冲电流源模块11可采用任意在单脉冲电压信号的驱动下产生单脉冲电流信号的硬件电路或软件实现，可根据不同的应用场合设置所述单脉冲电流信号的大小及脉冲宽度，不以本实施例为限。In this embodiment, the current of the single pulse current signal output by the pulse current source module 11 can be as high as 10 mA, and the output pulse width is as low as 100 ns, which is suitable for current test and analysis of PCRAM device units. The pulse current source module 11 can be implemented by any hardware circuit or software that generates a single pulse current signal driven by a single pulse voltage signal, and the size and pulse width of the single pulse current signal can be set according to different applications. This example is limited.

如图1所示，所述上位机12用于发出控制命令。As shown in FIG. 1 , the host computer 12 is used to issue control commands.

具体地，在本实施例中，所述上位机12采用电脑实现。Specifically, in this embodiment, the host computer 12 is implemented by a computer.

如图1所示，所述单电源电平转换模块13连接于所述上位机12及所述微处理模块14之间，用于进行电平转换。As shown in FIG. 1 , the single power supply level conversion module 13 is connected between the host computer 12 and the micro-processing module 14 for level conversion.

具体地，在本实施例中，所述单电源电平转换模块13采用MAX232芯片实现，适于RS232标准的串口。Specifically, in this embodiment, the single power supply level conversion module 13 is realized by using a MAX232 chip, which is suitable for serial ports of the RS232 standard.

如图1所示，所述微处理模块14连接于所述单电源电平转换模块13，接收经电平转换后的所述上位机12发出的控制指令，根据所述上位机12的指令控制所述开关驱动模块15根据不同的测试模式输出相应的开关控制信号。As shown in Figure 1, the micro-processing module 14 is connected to the single power supply level conversion module 13, receives the control command sent by the host computer 12 after the level conversion, and controls according to the command of the host computer 12 The switch driving module 15 outputs corresponding switch control signals according to different test modes.

具体地，在本实施例中，所述微处理模块14采用89C51单片机实现。Specifically, in this embodiment, the micro-processing module 14 is realized by 89C51 single-chip microcomputer.

如图1所示，所述开关驱动模块15连接所述微处理模块14，用于产生开关控制信号。As shown in FIG. 1 , the switch driving module 15 is connected to the micro-processing module 14 for generating switch control signals.

具体地，在本实施例中，所述开关驱动模块15为光耦继电器驱动模块，采用ULN2003芯片实现。所述开关驱动模块15接收所述89C51单片机输出的控制信号，产生驱动所述测试状态切换模块16的开关控制信号。由于所述89C51单片机的带负载能力比较弱，因此需要ULN2003芯片来实现驱动功能，另外在ULN2003芯片的输入端外接上拉电阻，在本实施例中，上拉电阻的阻值设定为10Kohm，在实际使用中可根据需要设定上拉电阻的阻值，不以本实施例为限。在本实施例中，ULN2003芯片是高耐压、大电流达林顿系列，由七个硅NPN达林顿管组成，具有电流增益高、工作电压高、温度范围宽、带负载能力强等特点，适应于各类要求高速大功率驱动的系统。Specifically, in this embodiment, the switch driving module 15 is an optocoupler relay driving module, which is realized by using a ULN2003 chip. The switch driving module 15 receives the control signal output by the 89C51 microcontroller, and generates a switch control signal to drive the test state switching module 16 . Because the load capacity of the 89C51 single-chip microcomputer is relatively weak, the ULN2003 chip is needed to realize the driving function. In addition, the input terminal of the ULN2003 chip is externally connected with a pull-up resistor. In this embodiment, the resistance value of the pull-up resistor is set to 10Kohm. In actual use, the resistance value of the pull-up resistor can be set as required, and is not limited to this embodiment. In this embodiment, the ULN2003 chip is a high withstand voltage and high current Darlington series, which is composed of seven silicon NPN Darlington tubes, and has the characteristics of high current gain, high working voltage, wide temperature range, and strong load capacity. , suitable for various systems requiring high-speed and high-power drive.

如图1所示，所述测试状态切换模块16连接于所述脉冲电流源模块11及所述开关驱动模块15，受各开关控制信号的控制切换测试通路；电压测试时输出单脉冲电压信号，电流测试时输出单脉冲电流信号，测量时提供测量通路。As shown in Figure 1, the test state switching module 16 is connected to the pulse current source module 11 and the switch drive module 15, and is controlled by each switch control signal to switch the test path; output a single pulse voltage signal during the voltage test, Output a single pulse current signal during current testing, and provide a measurement path during measurement.

具体地，所述测试状态切换模块16包括6个开关，在本实施例中，各开关采用光耦继电器实现，任意可实现开关功能的器件均适用于本发明，不以本实施例为限。更具体地，所述测试状态切换模块包括第一光耦继电器R1、第二光耦继电器R2、第三光耦继电器R3、第四光耦继电器R4、第五光耦继电器R5及第六光耦继电器R6。所述第一光耦继电器R1的第一端连接单脉冲电压信号、作为单脉冲电压输入端PULSEH，所述第一光耦继电器R1第二端连接所述第二光耦继电器R2的第一端、并作为单脉冲电压输出端PROBE1；所述第二光耦继电器R2的第二端连接所述脉冲电流源模块11的驱动端Data；所述第三光耦继电器R3的第一端连接单脉冲电流信号、作为单脉冲电流输出端PROBE3，所述第三光耦继电器R3的第二端作为第一测量端SMUH；所述第四光耦继电器R4的第一端与所述第一光耦继电器R2的第二端连接，所述第四光耦继电器R4的第二端与所述第一测量端SMUH连接；所述第五光耦继电器R5的第一端作为第二测量端SMUL，第二端作为接地端PROBE2；所述第六光耦继电器R6的第一端连接所述接地端PROBE2，第二端接地。各光耦继电器的控制端外接一个上拉电阻，并与所述光耦继电器驱动模块的输出端连接，各光耦继电器的第一端及第二端提供信号切换的通路；各光耦继电器的第一端及第二端的开通与关断由光耦继电器驱动模块的输出决定，当所述光耦继电器驱动模块输出(即光耦继电器的控制端输入)为低电平，则光耦继电器的第一端及第二端关断，相当于断路；当所述光耦继电器驱动模块输出(即光耦继电器的控制端输入)为高电平，则光耦继电器的第一端及第二端闭合，相当于导通。Specifically, the test state switching module 16 includes 6 switches. In this embodiment, each switch is implemented by an optocoupler relay. Any device that can realize the switching function is applicable to the present invention, not limited to this embodiment. More specifically, the test state switching module includes a first optocoupler relay R1, a second optocoupler relay R2, a third optocoupler relay R3, a fourth optocoupler relay R4, a fifth optocoupler relay R5 and a sixth optocoupler relay Relay R6. The first end of the first optocoupler relay R1 is connected to a single pulse voltage signal as a single pulse voltage input terminal PULSEH, and the second end of the first optocoupler relay R1 is connected to the first end of the second optocoupler relay R2 , and as a single pulse voltage output terminal PROBE1; the second end of the second optocoupler relay R2 is connected to the drive terminal Data of the pulse current source module 11; the first end of the third optocoupler relay R3 is connected to the single pulse The current signal is used as the single pulse current output terminal PROBE3, the second terminal of the third optocoupler relay R3 is used as the first measurement terminal SMUH; the first terminal of the fourth optocoupler relay R4 is connected with the first optocoupler relay The second end of R2 is connected, the second end of the fourth optocoupler relay R4 is connected to the first measurement terminal SMUH; the first end of the fifth optocoupler relay R5 is used as the second measurement terminal SMUL, and the second terminal as the ground terminal PROBE2; the first terminal of the sixth optocoupler relay R6 is connected to the ground terminal PROBE2, and the second terminal is grounded. The control end of each optocoupler relay is externally connected with a pull-up resistor, and is connected with the output end of the optocoupler relay drive module, and the first end and the second end of each optocoupler relay provide a path for signal switching; each optocoupler relay The opening and closing of the first end and the second end are determined by the output of the optocoupler relay drive module. When the output of the optocoupler relay drive module (ie, the control terminal input of the optocoupler relay) is low level, the The first end and the second end are turned off, which is equivalent to an open circuit; when the output of the optocoupler relay drive module (that is, the control terminal input of the optocoupler relay) is high level, the first end and the second end of the optocoupler relay Closing is equivalent to conduction.

如图1所示，所述接口模块17引出所述电压电流测试自动切换电路的输入信号及输出信号。As shown in FIG. 1 , the interface module 17 leads out the input signal and output signal of the voltage and current test automatic switching circuit.

具体地，所述接口模块17包括单脉冲电压输入端PULSEH、单脉冲电压输出端PROBE1、接地端PROBE2、单脉冲电流输出端PROBE3、负直流电流输入端PROBE4以及阻抗测量设备的测量端P0。其中，所述单脉冲电压输入端PULSEH、所述单脉冲电压输出端PROBE1、所述接地端PROBE2、所述单脉冲电流输出端PROBE3及所述负直流电流输入端PROBE4为卡扣配合型连接器(Bayonet Nut Connector，BNC)。Specifically, the interface module 17 includes a single pulse voltage input terminal PULSEH, a single pulse voltage output terminal PROBE1, a ground terminal PROBE2, a single pulse current output terminal PROBE3, a negative DC current input terminal PROBE4, and a measurement terminal P0 of an impedance measurement device. Wherein, the single pulse voltage input terminal PULSEH, the single pulse voltage output terminal PROBE1, the ground terminal PROBE2, the single pulse current output terminal PROBE3 and the negative DC current input terminal PROBE4 are snap fit connectors (Bayonet Nut Connector, BNC).

实施例二Embodiment two

如图2所示，本发明提供一种相变单元测试系统，所述相变单元测试系统包括：As shown in Figure 2, the present invention provides a kind of phase-change unit test system, and described phase-change unit test system comprises:

所述电压电流测试自动切换电路1、单脉冲电压信号发生器2、GPIB总线3、数字源表4、探针台5以及器件6。在本实施例中，所述器件6包括第一待测相变电阻61及第二待测相变电阻62。The voltage and current test automatic switching circuit 1 , single pulse voltage signal generator 2 , GPIB bus 3 , digital source meter 4 , probe station 5 and device 6 . In this embodiment, the device 6 includes a first phase-change resistor to be tested 61 and a second phase-change resistor to be tested 62 .

如图2所示，单脉冲电压信号发生器2用于产生单脉冲电压信号。As shown in FIG. 2 , the single-pulse voltage signal generator 2 is used to generate a single-pulse voltage signal.

具体地，所述单脉冲电压信号发生器2通过所述GPIB总线3与所述上位机12连接，受所述上位机12的控制输出单脉冲电压信号。在本实施例中，所述单脉冲电压信号发生器2采用AWG5000B任意波形发生器实现。Specifically, the single-pulse voltage signal generator 2 is connected to the host computer 12 through the GPIB bus 3 , and is controlled by the host computer 12 to output a single-pulse voltage signal. In this embodiment, the single pulse voltage signal generator 2 is realized by using an AWG5000B arbitrary waveform generator.

如图2所示，所述数字源表4用于测量所述器件6的电阻，并产生负直流电流信号。As shown in FIG. 2 , the digital source meter 4 is used to measure the resistance of the device 6 and generate a negative direct current signal.

具体地，所述数字源表4通过所述GPIB总线3与所述上位机12连接，受所述上位机12的控制提供负直流电流信号或进行电阻的测量。在本实施例中，所述数字源表4采用2602A数字源表实现。Specifically, the digital source meter 4 is connected to the host computer 12 through the GPIB bus 3 , and is controlled by the host computer 12 to provide a negative DC current signal or perform resistance measurement. In this embodiment, the digital source meter 4 is implemented by a 2602A digital source meter.

如图2所示，所述电压电流测试自动切换电路1连接所述单脉冲电压信号发生器2、所述数字源表4及所述探针台5，根据测试需求进行自动切换，满足了自动化测试的需求。As shown in Figure 2, the voltage and current test automatic switching circuit 1 is connected to the single pulse voltage signal generator 2, the digital source meter 4 and the probe station 5, and automatically switches according to the test requirements, which meets the requirements of automation. testing needs.

具体地，所述电压电流测试自动切换电路1接收单脉冲电压信号及负直流电流信号，并通过所述探针台5与所述第一待测相变电阻61及所述第二待测相变电阻62连接.Specifically, the voltage and current test automatic switching circuit 1 receives a single pulse voltage signal and a negative DC current signal, and passes through the probe station 5 and the first phase-change resistor 61 to be tested and the second phase-change resistor to be tested. The variable resistor 62 is connected.

更具体地，所述电压电流测试自动切换电路1的单脉冲电压输入端PULSEH接收单脉冲电压信号，负直流电流输入端PROBE4接收负直流电流信号，单脉冲电压输出端PROBE1连接所述探针台5的脉冲电压输入端，单脉冲电流输出端PROBE3连接所述探针台5的脉冲电流输入端，第一测试端SMUH连接所述数字源表的第一端，第二测试端SMUL连接所述数字源表的第二端，接地端PROBE2连接所述探针台5的接地端。所述第一待测相变电阻61连接于所述探针台5的脉冲电压输入端与所述探针台5的接地端之间，所述第二待测相变电阻62连接于所述探针台5的脉冲电流输入端与所述探针台5的接地端之间。在电压测试时，所述电压电流测试自动切换电路1向所述第一待测相变电阻61提供单脉冲电压信号；在电流测试时，所述电压电流测试自动切换电路1向所述第二待测相变电阻62提供单脉冲电流信号；在测量时，所述电压电流测试自动切换电路1将所述数字源表4连接于所述第一待测相变电阻61或所述第二待测相变电阻62的两端。More specifically, the single pulse voltage input terminal PULSEH of the voltage and current test automatic switching circuit 1 receives a single pulse voltage signal, the negative direct current input terminal PROBE4 receives a negative direct current signal, and the single pulse voltage output terminal PROBE1 is connected to the probe station The pulse voltage input terminal of 5, the single pulse current output terminal PROBE3 is connected to the pulse current input terminal of the probe station 5, the first test terminal SMUH is connected to the first terminal of the digital source meter, and the second test terminal SMUL is connected to the The second terminal of the digital source meter, the ground terminal PROBE2 is connected to the ground terminal of the probe station 5 . The first phase-change resistor 61 to be tested is connected between the pulse voltage input terminal of the probe station 5 and the ground terminal of the probe station 5, and the second phase-change resistor 62 to be tested is connected to the Between the pulse current input terminal of the probe station 5 and the ground terminal of the probe station 5 . During the voltage test, the voltage and current test automatic switching circuit 1 provides a single pulse voltage signal to the first phase change resistance 61 to be tested; during the current test, the voltage and current test automatic switching circuit 1 supplies the second The phase-change resistance 62 to be measured provides a single-pulse current signal; when measuring, the voltage and current test automatic switching circuit 1 connects the digital source meter 4 to the first phase-change resistance 61 to be measured or the second phase-change resistance to be measured. Measure the two ends of the phase change resistor 62.

如图2所示，所述探针台5与所述电压电流测试自动切换电路1、所述数字源表4、所述第一待测相变电阻61及所述第二待测相变电阻62连接，用于通过探针将所述第一待测相变电阻61或所述第二待测相变电阻62与所述电压电流测试自动切换电路1或所述数字源表连接4。As shown in Figure 2, the probe station 5 and the voltage and current test automatic switching circuit 1, the digital source meter 4, the first phase-change resistance to be measured 61 and the second phase-change resistance to be measured 62 connection, used to connect the first phase-change resistor 61 to be tested or the second phase-change resistor 62 to be tested with the voltage and current test automatic switching circuit 1 or the digital source meter through a probe.

实施例三Embodiment three

如图3所示，本发明提供一种相变单元测试系统的测试方法，所述相变单元测试系统方法包括：As shown in Fig. 3, the present invention provides a kind of testing method of phase change unit test system, and described phase change unit test system method comprises:

电压测试时，所述电压电流测试自动切换电路接收单脉冲电压信号，并将所述单脉冲电压信号加载到第一待测相变电阻的两端，然后将数字源表并联于所述第一待测相变电阻的两端，测量所述第一待测相变电阻的阻值。During the voltage test, the voltage and current test automatic switching circuit receives a single-pulse voltage signal, and loads the single-pulse voltage signal to both ends of the first phase-change resistance to be tested, and then connects a digital source meter in parallel to the first Measure the resistance value of the first phase-change resistor to be tested at both ends of the phase-change resistor to be tested.

具体地，在电压测试时，所述第一光耦继电器R1和第六光耦继电器R6导通，其他光耦继电器断开。单脉冲电压信号从单脉冲电压输入端PULSEH进入，并经过所述第一光耦继电器R1从单脉冲电压输出端PROBE1进入所述第一待测相变电阻61，穿过所述第一待测相变电阻61之后，经过接地端PROBE2流入大地。Specifically, during the voltage test, the first optocoupler relay R1 and the sixth optocoupler relay R6 are turned on, and the other optocoupler relays are turned off. The single-pulse voltage signal enters from the single-pulse voltage input terminal PULSEH, and enters the first phase-change resistor 61 to be measured from the single-pulse voltage output terminal PROBE1 through the first optocoupler relay R1, and passes through the first After the phase change resistor 61, it flows into the ground through the ground terminal PROBE2.

具体地，在单脉冲电压信号作用所述第一待测相变电阻61之后，下一个单脉冲电压信号来到之前，要测量出此时所述第一待测相变电阻61的阻值，就要把所述数字源表4接入。此时，所述第四光耦继电器R4及所述第五光耦继电器R5导通，其他光耦继电器断开。所述数字源表4接入到所述第一待测相变电阻61的两端，所述数字源表4通过施加一个小直流电压，并读取负直流电流来获得所述第一待测相变电阻61的阻值。Specifically, after the single-pulse voltage signal acts on the first phase-change resistor 61 to be tested, and before the next single-pulse voltage signal arrives, the resistance value of the first phase-change resistor 61 to be tested at this time should be measured, The digital source meter 4 will be connected. At this time, the fourth optocoupler relay R4 and the fifth optocoupler relay R5 are turned on, and the other optocoupler relays are turned off. The digital source meter 4 is connected to both ends of the first phase-change resistance 61 to be tested, and the digital source meter 4 obtains the first measured voltage by applying a small DC voltage and reading a negative DC current. The resistance value of the phase change resistor 61.

电流测试时，所述电压电流测试自动切换电路接收所述单脉冲电压信号及负直流电流信号，基于所述单脉冲电压信号及所述负直流电流信号产生单脉冲电流信号，将所述单脉冲电流信号加载到第二待测相变电阻，然后将所述数字源表并联于所述第二待测相变电阻的两端，测量所述第二待测相变电阻的阻值。During the current test, the voltage and current test automatic switching circuit receives the single pulse voltage signal and the negative direct current signal, generates a single pulse current signal based on the single pulse voltage signal and the negative direct current signal, and converts the single pulse The current signal is loaded to the second phase-change resistance to be measured, and then the digital source meter is connected in parallel to both ends of the second phase-change resistance to be measured, and the resistance value of the second phase-change resistance to be measured is measured.

具体地，在电流测试时，所述第一光耦继电器R1、所述第二光耦继电器R2及所述第六光耦继电器R6导通，其他光耦继电器断开。单脉冲电压信号从单脉冲电压输入端PULSEH进入，并经过所述第一光耦继电器R1、所述第二光耦继电器R2进入所述脉冲电流源模块11的驱动端Data；负直流电流信号从所述负直流电流输入端PROBE4进入所述脉冲电流源模块11的第一输入端Rext1，所述脉冲电流源模块11产生单脉冲电流信号，并从单脉冲电流输出端PROBE3输出，穿过所述第二待测相变电阻62之后，经过所述接地端PROBE2流入大地。Specifically, during the current test, the first optocoupler relay R1 , the second optocoupler relay R2 and the sixth optocoupler relay R6 are turned on, and the other optocoupler relays are turned off. The single-pulse voltage signal enters from the single-pulse voltage input terminal PULSEH, and enters the driving terminal Data of the pulse current source module 11 through the first optocoupler relay R1 and the second optocoupler relay R2; The negative DC current input terminal PROBE4 enters the first input terminal Rext1 of the pulse current source module 11, and the pulse current source module 11 generates a single pulse current signal, and outputs it from the single pulse current output terminal PROBE3, passing through the After the second phase-change resistor 62 to be tested, it flows into the ground through the ground terminal PROBE2.

具体地，在单脉冲电流信号作用所述第二待测相变电阻62之后，下一个单脉冲电流信号来到之前，要测量出此时所述第二待测相变电阻62的阻值，就要把所述数字源表4接入。此时，所述第三光耦继电器R3及所述第五光耦继电器R5导通，其他光耦继电器断开。所述数字源表4接入到所述第二待测相变电阻62的两端，所述数字源表4通过施加一个小直流电压，并读取负直流电流来获得所述第二待测相变电阻62的阻值。Specifically, after the single-pulse current signal acts on the second phase-change resistor 62 to be measured, before the next single-pulse current signal arrives, the resistance value of the second phase-change resistor 62 to be measured at this time should be measured, The digital source meter 4 will be connected. At this time, the third optocoupler relay R3 and the fifth optocoupler relay R5 are turned on, and the other optocoupler relays are turned off. The digital source meter 4 is connected to both ends of the second phase-change resistance 62 to be measured, and the digital source meter 4 obtains the second measured voltage by applying a small DC voltage and reading a negative DC current. The resistance value of the phase change resistor 62.

本发明的电压电流测试自动切换电路、相变单元测试系统及方法将分立的电压和电流测试系统合成到一起，通过电压和电流的自动切换实现工程测试的自动化，同时减小噪音干扰。The voltage and current test automatic switching circuit, phase change unit test system and method of the present invention combine discrete voltage and current test systems together, realize automation of engineering tests through automatic switching of voltage and current, and reduce noise interference at the same time.

综上所述，本发明提供一种电压电流测试自动切换电路、相变单元测试系统及方法，电压电流测试自动切换电路包括：脉冲电流源模块，用于产生单脉冲电流信号；开关驱动模块，用于产生开关控制信号；测试状态切换模块，连接于所述脉冲电流源模块及所述开关驱动模块，受各开关控制信号的控制切换测试通路；电压测试时输出单脉冲电压信号，电流测试时输出单脉冲电流信号，测量时提供测量通路；接口模块，引出所述电压电流测试自动切换电路的输入信号及输出信号。相变单元测试系统包括数字源表、探针台、第一待测相变电阻及第二待测相变电阻。电压测试时，所述电压电流测试自动切换电路接收单脉冲电压信号，并将所述单脉冲电压信号加载到第一待测相变电阻的两端，然后将数字源表并联于所述第一待测相变电阻的两端，测量所述第一待测相变电阻的阻值；电流测试时，所述电压电流测试自动切换电路接收所述单脉冲电压信号及负直流电流信号，基于所述单脉冲电压信号及所述负直流电流信号产生单脉冲电流信号，将所述单脉冲电流信号加载到第二待测相变电阻，然后将所述数字源表并联于所述第二待测相变电阻的两端，测量所述第二待测相变电阻的阻值。本发明的电压电流测试自动切换电路、相变单元测试系统及方法将分立的电压和电流测试系统合成到一起，通过电压和电流的自动切换实现工程测试的自动化，同时减小噪音干扰。所以，本发明有效克服了现有技术中的种种缺点而具高度产业利用价值。In summary, the present invention provides an automatic switching circuit for voltage and current testing, a phase change unit testing system and method, the automatic switching circuit for voltage and current testing includes: a pulse current source module for generating a single pulse current signal; a switch drive module, Used to generate switch control signals; the test state switching module is connected to the pulse current source module and the switch drive module, and is controlled by each switch control signal to switch the test path; output a single pulse voltage signal during a voltage test, and output a single pulse voltage signal during a current test. Output a single pulse current signal, and provide a measurement path during measurement; the interface module leads to the input signal and output signal of the automatic switching circuit for voltage and current testing. The phase change unit test system includes a digital source meter, a probe station, a first phase change resistor to be tested and a second phase change resistor to be tested. During the voltage test, the voltage and current test automatic switching circuit receives a single-pulse voltage signal, and loads the single-pulse voltage signal to both ends of the first phase-change resistance to be tested, and then connects a digital source meter in parallel to the first Measure the resistance value of the first phase-change resistance to be measured at both ends of the phase-change resistance to be measured; during the current test, the voltage-current test automatic switching circuit receives the single-pulse voltage signal and the negative DC current signal, and based on the The single-pulse voltage signal and the negative DC current signal generate a single-pulse current signal, and the single-pulse current signal is loaded to the second phase-change resistance to be tested, and then the digital source meter is connected in parallel to the second to-be-tested The two ends of the phase change resistor are used to measure the resistance value of the second phase change resistor to be tested. The voltage and current test automatic switching circuit, phase change unit test system and method of the present invention combine discrete voltage and current test systems together, realize automation of engineering tests through automatic switching of voltage and current, and reduce noise interference at the same time. Therefore, the present invention effectively overcomes various shortcomings in the prior art and has high industrial application value.

上述实施例仅例示性说明本发明的原理及其功效，而非用于限制本发明。任何熟悉此技术的人士皆可在不违背本发明的精神及范畴下，对上述实施例进行修饰或改变。因此，举凡所属技术领域中具有通常知识者在未脱离本发明所揭示的精神与技术思想下所完成的一切等效修饰或改变，仍应由本发明的权利要求所涵盖。The above-mentioned embodiments only illustrate the principles and effects of the present invention, but are not intended to limit the present invention. Anyone skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those skilled in the art without departing from the spirit and technical ideas disclosed in the present invention shall still be covered by the claims of the present invention.