WO2022088403A1 - Low-current wide-range adjustable pulse constant current source circuit - Google Patents

Low-current wide-range adjustable pulse constant current source circuit Download PDF

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WO2022088403A1
WO2022088403A1 PCT/CN2020/134879 CN2020134879W WO2022088403A1 WO 2022088403 A1 WO2022088403 A1 WO 2022088403A1 CN 2020134879 W CN2020134879 W CN 2020134879W WO 2022088403 A1 WO2022088403 A1 WO 2022088403A1
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switch
digital potentiometer
current source
terminal
current
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PCT/CN2020/134879
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French (fr)
Chinese (zh)
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唐德平
孙玉
朱国军
张建一
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合肥科威尔电源系统股份有限公司
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Publication of WO2022088403A1 publication Critical patent/WO2022088403A1/en

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    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F3/00—Non-retroactive systems for regulating electric variables by using an uncontrolled element, or an uncontrolled combination of elements, such element or such combination having self-regulating properties
    • G05F3/02—Regulating voltage or current
    • G05F3/08—Regulating voltage or current wherein the variable is dc

Definitions

  • the invention relates to the technical field of Vgeth testing of static parameters of power devices, in particular to a low-current wide-range adjustable pulse constant current source circuit.
  • IGBT Insulated Gate Field Effect Transistor
  • IGBT In addition to the good functions of semiconductor components, whether their parameters can meet the requirements of the circuit must be measured regularly, otherwise the quality characteristics of the product are difficult to guarantee, especially the larger power components, due to wear and tear, easy to age And the efficiency is reduced, burning due to imbalance, and even explosion in use. Therefore, it is more important to screen and check the parameters of new products and components in use.
  • IGBT IGBT is a mainstream semiconductor switching device widely used in modern medium and high power converters. Among them, IGBT devices are widely used in important electrical equipment such as traction inverters and auxiliary inverters of urban rail transit vehicles. Various static parameters of IGBT devices provide users with a very intuitive reference for reliable selection of devices. Therefore, Accurate measurement of various static parameters of IGBT has extremely important practical significance.
  • the low-current wide-range adjustable pulse constant current source is a key test device specially for the static test of power devices Vgeth (gate-emitter threshold voltage) parameter measurement; as shown in Figure 3, the main function of the constant current source is to After the power device under test C-G is short-circuited, the specified constant current is output between G-E, and Vge is measured. When Vge remains constant, the voltage is Vgeth.
  • Vgeth gate-emitter threshold voltage
  • the Vgeth parameter measurement of the static test of the power device is to apply a rated voltage between C and E, and adjust the voltage step by step through the voltage source.
  • the value of the current detection Ice reaches the preset current value, record the value of the voltage detection Vge at this time, namely Vgeth
  • this circuit has many devices and complex testing methods.
  • the applied constant current source output current can only satisfy multiple fixed values for selectable output, but it cannot meet the requirement of continuous selectable output, and cannot meet the different current values required by different Vgeth parameters of different types of power devices. requirements, which cannot cover the testing of all power devices.
  • the technical problem to be solved by the present invention is that the existing constant current source cannot continuously select the output, cannot meet the different current values required by different Vgeth parameters of different types of power devices, and cannot cover the test of all power devices.
  • a low-current wide-range adjustable pulse constant current source circuit comprising a digital signal isolation circuit, a digital potentiometer output circuit, a switch switching circuit, and a current source circuit; the digital signal isolation circuit is connected with the digital potentiometer output circuit, so the The above-mentioned current source circuit is connected with the digital potentiometer output circuit through the switch switching circuit; the digital signal isolation circuit sends the set current signal value to the digital potentiometer output circuit, and the digital potentiometer output circuit and the switch switching circuit cooperate with each other to output different values. Resistance value, select the output loop of the current source circuit, so as to control the constant current source circuit to continuously adjust the constant current output at 10uA-1A.
  • the constant current source circuit of the present invention ensures fast and high-precision continuous adjustable constant current source output by controlling the high-precision digital potentiometer to output adjustable resistance and selecting high-precision current sources of different ranges;
  • the power device under test can directly obtain the stable Vgeth value of the static parameter of the power device; in the test circuit of the national standard, the measurement of the Vgeth parameter of the static test of the power device requires a continuously adjustable voltage source, and the real-time detection current value reaches the preset current value, at this time
  • the applied voltage value is Vgeth.
  • This method requires synchronous detection of voltage and current values, high sampling rate requirements, relatively high implementation cost, and complicated control.
  • the digital signal isolation circuit includes a four-channel digital signal isolator (U1) and a two-channel digital signal isolator (U2);
  • the digital potentiometer output circuit includes a 100K digital potentiometer (U3), 10K digital potentiometer (U4) and 1K digital potentiometer (U5);
  • the 100K digital potentiometer (U3) is connected to the four-channel digital signal isolator (U1);
  • the 10K digital potentiometer ( U4) are respectively connected with the four-channel digital signal isolator (U1) and the two-channel digital signal isolator (U2);
  • the 1K digital potentiometer (U5) is respectively connected with the four-channel digital signal isolator (U1) and the two-channel digital signal isolator (U2).
  • Signal isolator (U2) connection is a four-channel digital signal isolator (U1) and a two-channel digital signal isolator (U2) connection.
  • the digital potentiometer output circuit also includes a capacitor C1 and a capacitor C3, one end of the capacitor C1 is connected to the 7# pin of the 100K digital potentiometer (U3), and the other end is grounded; One end of the capacitor C3 is connected to the 7# pin of the 10K digital potentiometer (U4), and the other end is grounded.
  • the switch switching circuit includes a first switch (SW1), a second switch (SW2), a fifth switch (SW5), a sixth switch (SW6), and an eighth switch (SW8) , the ninth switch (SW9); the 1# terminal of the first switch (SW1) is connected to the 4# pin of the 100K digital potentiometer (U3), and the 1# terminal of the second switch (SW2) The # terminal is connected to the 5# pin of the 100K digital potentiometer (U3), and the 1# terminal of the fifth switch (SW5) is connected to the 2# pin of the 10K digital potentiometer (U4).
  • the 1# terminal of the sixth switch (SW6) is connected to the 3# pin of the 10K digital potentiometer (U4)
  • the 1# terminal of the eighth switch (SW8) is connected to the 1K
  • the 7# pin of the digital potentiometer (U5) is connected
  • the 1# terminal of the ninth switch (SW9) is connected to the 1# pin of the 1K digital potentiometer (U5);
  • the first switch The 2# terminal of (SW1), the 2# terminal of the fifth switch (SW5), and the 2# terminal of the eighth switch (SW8) are connected together, and the 2# terminal of the second switch (SW2) and the sixth switch
  • the 2# terminal of (SW6) and the 2# terminal of the ninth switch (SW9) are connected together.
  • the switch switching circuit further includes a first selection switch (SW4) and a second selection switch (SW7);
  • the current source circuit includes a current source chip (U6), which can be lowered Voltage drop regulator (U7), resistor R1; the 2# terminal of the first selection switch (SW4), the 2# terminal of the first switch (SW1), and the 2# terminal of the fifth switch (SW5) The terminal and the 2# terminal of the eighth switch (SW8) are connected together, the 1# terminal of the first selection switch (SW4) is connected to the 1# pin of the current source chip (U6), the resistance R1 One end is connected to the 2# pin of the adjustable low dropout voltage regulator (U7), and the other end of the resistor R1 is connected to the 3# terminal of the first selection switch (SW4); the second selection switch (SW7) The 2# terminal is connected with the 2# terminal of the second switch (SW2), the 2# terminal of the sixth switch (SW6), and the 2# terminal of the ninth switch (SW9),
  • the current source circuit further includes an analog selection switch (SW3), a MOSFET power device (Q1), a resistor R2, a power device control signal generator; a capacitor C2 and a capacitor C4;
  • SW3 analog selection switch
  • the 2# terminal of the analog selection switch (SW3) is connected to the 1# pin of the current source chip (U6)
  • the 1# terminal of the analog selection switch (SW3) is connected to the drain of the MOSFET power device (Q1)
  • the analog selection switch The 3# terminal of SW3) is grounded, and the source of the MOSFET power device (Q1) is grounded
  • one end of the capacitor C2 is connected to the 3# pin of the current source chip (U6), and the other end is grounded
  • the capacitor C4 is connected to the ground.
  • One end is connected to the 3# pin of the adjustable low dropout regulator (U7), and the other end is grounded; one end of the resistor R1 is connected to the 2# pin of the adjustable low dropout regulator (U7), The other end of the resistor R1 is connected with the drain of the MOSFET power device (Q1); the resistor R2 is connected in parallel between the gate and the source of the MOSFET power device (Q1), and the power device control signal generator is connected in parallel. across the resistor R2.
  • the described constant current source circuit is continuously adjustable constant current output at 10uA-1A, and is realized by a combination of 5 sections:
  • the four-channel digital signal isolator (U1) selects the 100K digital potentiometer (U3), and sets the D value of the 100K digital potentiometer (U3) through formulas (1) and (2), so that the 100K digital potentiometer (U3) Output the resistance value corresponding to the required current, and select the current source chip (U6) to output the corresponding current value through the first switch (SW1), the second switch (SW2), the first selection switch (SW4), and the second selection switch (SW7) ,Calculated as follows:
  • Iout is the output current value
  • RSET(D) is the set resistance value
  • 67.7 is the rated output value of the current source chip (U6)
  • D is the decimal value, at this time, the value range is 1-69;
  • the four-channel digital signal isolator (U1) and the two-channel digital signal isolator (U2) select the 1K digital potentiometer (U5) and set the D value of the 1K digital potentiometer (U5) through formulas (1) and (3).
  • the 1K digital potentiometer (U5) outputs the resistance value corresponding to the required current, and the current source is selected through the eighth switch (SW8), the ninth switch (SW9), the first selection switch (SW4), and the second selection switch (SW7).
  • the chip (U6) outputs the corresponding current value, and the calculation formula is as follows:
  • the value range of D is 17-256 at this time;
  • the four-channel digital signal isolator (U1) and the two-channel digital signal isolator (U2) select the 1K digital potentiometer (U5) and set the D value of the 1K digital potentiometer (U5) through formulas (3) and (4).
  • the 1K digital potentiometer (U5) outputs the resistance value corresponding to the required current, which can be adjusted through the eighth switch (SW8), the ninth switch (SW9), the first selection switch (SW4), and the second selection switch (SW7).
  • the low dropout voltage regulator (U7) outputs the corresponding current value, and the calculation formula is as follows:
  • 10 is the rated output value of the adjustable low-dropout voltage regulator (U7), and the value range of D is 26-256;
  • the four-channel digital signal isolator (U1) and the two-channel digital signal isolator (U2) select the 10K digital potentiometer (U4) and set the D value of the 10K digital potentiometer (U4) through formulas (4) and (5).
  • the 10K digital potentiometer (U4) outputs the resistance value corresponding to the required current, which can be adjusted through the fifth switch (SW5), the sixth switch (SW6), the first selection switch (SW4), and the second selection switch (SW7).
  • the low dropout voltage regulator (U7) outputs the corresponding current value, and the calculation formula is as follows:
  • the value range of D at this time is 102-1024;
  • the four-channel digital signal isolator (U1) selects the 100K digital potentiometer (U3) and sets the D value of the 100K digital potentiometer (U3) through formulas (2) and (4), so that the 100K digital potentiometer (U3) outputs
  • the resistance value corresponding to the demand current is selected by the first switch (SW1), the second switch (SW2), the first selection switch (SW4), and the second selection switch (SW7) to select the output of the adjustable low-dropout regulator (U7)
  • the corresponding current value, the calculation formula is as follows:
  • the value range of D is 103-1024.
  • the model of the four-channel digital signal isolator (U1) is ADUM141E
  • the model of the two-channel digital signal isolator (U2) is ADUM1200.
  • the model of the 100K digital potentiometer (U3) is AD5293
  • the model of the 10K digital potentiometer (U4) is AD5174
  • the model of the 1K digital potentiometer (U5) is AD8400.
  • the model of the current source chip (U6) is LM334; the model of the adjustable low dropout voltage regulator (U7) is LT3080; the model of the analog selection switch (SW3) is ADG5419 ; The model of the MOSFET power device (Q1) is FQP50N06.
  • the constant current source circuit of the present invention by controlling the high-precision digital potentiometer to output adjustable resistance, combined with the selection of high-precision current sources of different ranges, ensures fast and high-precision continuous adjustable constant current source output; Output to the power device under test can directly obtain the stable Vgeth value of the static parameter of the power device; in the test circuit of the national standard, the measurement of the Vgeth parameter of the static test of the power device requires a continuously adjustable voltage source, and the real-time detection current value reaches the preset current value , the voltage value applied at this time is Vgeth, this method requires synchronous detection of voltage and current values, high sampling rate requirements, relatively high implementation cost, and complicated control.
  • Constant current source output low current 10uA-1A continuously adjustable, high output precision.
  • the output of the constant current source is mostly single non-adjustable or multi-level adjustment.
  • the output continuously adjustable resistance value Through the programming and control of three high-precision digital potentiometers, 1K, 10K, and 100K, the output continuously adjustable resistance value, combined with different combinations of power chips with high and low current ranges, so as to output a wide range of low current continuously adjustable and high precision The constant current source output.
  • FIG. 1 is a digital signal isolation circuit diagram of a low-current wide-range adjustable pulse constant current source circuit according to an embodiment of the present invention
  • FIG. 2 is a main circuit diagram of a low-current wide-range adjustable pulse constant current source circuit according to an embodiment of the present invention
  • Fig. 3 is the circuit schematic diagram of the national standard Vgeth parameter test method
  • Fig. 4 is the circuit schematic diagram of applying the Vgeth parameter test method of wide-range adjustable constant current source.
  • a low-current wide-range adjustable pulse constant current source circuit includes a digital signal isolation circuit, a digital potentiometer output circuit, a switch switching circuit, and a current source circuit; the digital signal isolation circuit It is connected with the digital potentiometer output circuit, and the current source circuit is connected with the digital potentiometer output circuit through the switch switching circuit; the tested IGBT power device DUT1 is connected with the current source circuit through the analog selection switch SW3 or the MOSFET power device Q1.
  • the digital signal isolation circuit includes a four-channel digital signal isolator U1 and a two-channel digital signal isolator U2; the four-channel digital signal isolator U1 is ADUM141E, a two-channel digital signal isolator
  • the model of U2 is ADUM1200; the signal input terminals of the four-channel digital signal isolator U1 and the two-channel digital signal isolator U2 are respectively connected to the DSP controller through SPI communication, and the four-channel digital signal isolator U1 and the two-channel digital signal isolator U1 and the two-channel digital signal isolator.
  • the signal output ends of the digital signal isolator U2 are respectively connected with the 100K digital potentiometer U3, the 10K digital potentiometer U4 and the 1K digital potentiometer U5.
  • the digital potentiometer output circuit includes a 100K digital potentiometer U3 and an external capacitor C1, a 10K digital potentiometer U4 and an external capacitor C3, and a 1K digital potentiometer U5; the model of the 100K digital potentiometer U3 is AD5293, the model of the 10K digital potentiometer U4 is AD5174, and the model of the 1K digital potentiometer U5 is AD8400.
  • the switch switching circuit includes a first switch SW1, a second switch SW2, a fifth switch SW5, a sixth switch SW6, an eighth switch SW8, a ninth switch SW9, a first selection switch SW4, and a second selection switch SW7, which are switched by switch combinations. Match different resistor values and select current source circuits.
  • the current source circuit includes a current source chip U6, an adjustable low-dropout voltage regulator U7, a capacitor C2, a capacitor C4, an analog selection switch SW3, a MOSFET power device Q1, a resistor R1, a resistor R2, and a power device control signal generator; the The model of the current source chip U6 is LM334; the model of the adjustable low dropout voltage regulator U7 is LT3080; the model of the analog selection switch SW3 that controls the output current of the current source chip U6 is ADG5419; the model of the control adjustable low voltage is ADG5419
  • the MOSFET power device Q1 that drops the output current of the voltage regulator U7 is FQP50N06.
  • the 100K digital potentiometer U3 is connected with the four-channel digital signal isolator U1; the 10K digital potentiometer U4 is respectively connected with the four-channel digital signal isolator U1 and the two-channel digital signal isolator U2; the 1K digital The potentiometer U5 is respectively connected with the four-channel digital signal isolator U1 and the two-channel digital signal isolator U2; one end of the capacitor C1 is connected to the 7# pin of the 100K digital potentiometer U3, and the other end is grounded; the capacitor C3 One end is connected to the 7# pin of the 10K digital potentiometer U4, and the other end is grounded.
  • the 1# terminal of the first switch SW1 is connected to the 4# pin of the 100K digital potentiometer U3, and the 1# terminal of the second switch SW2 is connected to the 5# pin of the 100K digital potentiometer U3.
  • the pins are connected, the 1# terminal of the fifth switch SW5 is connected to the 2# pin of the 10K digital potentiometer U4, and the 1# terminal of the sixth switch SW6 is connected to the 10K digital potentiometer.
  • the 3# pin of U4 is connected, the 1# terminal of the eighth switch SW8 is connected to the 7# pin of the 1K digital potentiometer U5, and the 1# terminal of the ninth switch SW9 is connected to the The 1# pin of the 1K digital potentiometer U5 is connected; the 2# terminal of the first switch SW1, the 2# terminal of the fifth switch SW5, and the 2# terminal of the eighth switch SW8 are connected together, and the second The 2# terminal of the switch SW2, the 2# terminal of the sixth switch SW6, and the 2# terminal of the ninth switch SW9 are connected together.
  • the 2# terminal of the first selection switch SW4 is connected with the 2# terminal of the first switch SW1, the 2# terminal of the fifth switch SW5, and the 2# terminal of the eighth switch SW8.
  • the 1# terminal of a selection switch SW4 is connected to the 1# pin of the current source chip U6, and the 3# terminal of the first selection switch SW4 is connected to the drain of the MOSFET power device Q1.
  • the 2# terminal of the second selection switch SW7 is connected with the 2# terminal of the second switch SW2, the 2# terminal of the sixth switch SW6, and the 2# terminal of the ninth switch SW9.
  • the 1# terminal of the second selection switch SW7 is connected to the 2# pin of the current source chip U6, and the 3# terminal of the second selection switch SW7 is connected to the 1# pin of the adjustable low dropout voltage regulator U7.
  • One end of the capacitor C2 is connected to the 3# pin of the current source chip U6, and the other end is grounded; one end of the capacitor C4 is connected to the 3# pin of the adjustable low drop voltage regulator U7, and the other end is grounded ;
  • One end of the described resistor R1 is connected with the 2# pin of the adjustable low-dropout voltage regulator U7, and the other end of the resistor R1 is connected with the drain of the MOSFET power device Q1;
  • the described resistor R2 is connected in parallel with the MOSFET power device Between the gate and the source of Q1, the power device control signal generator is connected in parallel with both ends of the resistor R2, and the source of the MOSFET power device Q1 is grounded;
  • the 2# terminal of the analog selection switch SW3 is connected to the current source
  • the 1# pin of the chip U6 is connected, the 1# terminal of the analog selection switch SW3 is connected to the drain of the MOSFET power device Q1, and the 3# terminal of the analog selection switch SW3 is grounded.
  • the host computer sends the set current signal value to the DSP controller, the DSP controller sends the current signal value to the digital signal isolation circuit through SPI communication, and the digital signal isolation circuit sends the current signal value to the digital potentiometer output circuit.
  • the potentiometer output circuit outputs the resistance value corresponding to the current signal value by selecting the 100K digital potentiometer U3, 10K digital potentiometer U4 or 1K digital potentiometer U5, and selects the current source chip U6 or the adjustable low voltage drop through the switch switching circuit.
  • the voltage regulator U7 realizes 10uA-1A continuously adjustable constant current output.
  • the output of 10uA-1A continuously adjustable constant current source is realized by a combination of 5 sections, which are:
  • the DSP selects the 100K digital potentiometer U3 through the four-channel digital signal isolator U1, and sets the D value of the 100K digital potentiometer U3 through formulas (1) and (2), so that the 100K digital potentiometer U3 outputs the resistance corresponding to the required current value, through the first switch SW1, the second switch SW2, the first selection switch SW4, the second selection switch SW7 to select the current source chip U6 to output the corresponding current value, the calculation formula is as follows:
  • Iout is the output current value
  • RSET(D) is the set resistance value
  • 67.7 is the rated output value of the current source chip U6
  • D is the decimal value, at this time, the value range is 1-69.
  • the DSP selects the 1K digital potentiometer U5 through the four-channel digital signal isolator U1 and the two-channel digital signal isolator U2, and sets the D value of the 1K digital potentiometer U5 through formulas (1) and (3), so that the 1K digital potentiometer U5 outputs the resistance value corresponding to the required current, and selects the current source chip U6 to output the corresponding current value through the eighth switch SW8, the ninth switch SW9, the first selection switch SW4, and the second selection switch SW7, and the calculation formula is as follows:
  • the value range of D is 17-256 at this time.
  • the DSP selects the 1K digital potentiometer U5 through the four-channel digital signal isolator U1 and the two-channel digital signal isolator U2, and sets the D value of the 1K digital potentiometer U5 through formulas (3) and (4), so that the 1K digital potentiometer U5 outputs the resistance value corresponding to the required current, and selects the adjustable low-dropout voltage regulator U7 to output the corresponding current value through the eighth switch SW8, the ninth switch SW9, the first selection switch SW4, and the second selection switch SW7, and the calculation formula is as follows :
  • 10 is the rated output value of the adjustable low-dropout voltage regulator U7, and the value range of D is 26-256 at this time.
  • the DSP selects the 10K digital potentiometer U4 through the four-channel digital signal isolator U1 and the two-channel digital signal isolator U2, and sets the D value of the 10K digital potentiometer U4 through formulas (4) and (5), so that the 10K digital potentiometer U4 outputs the resistance value corresponding to the required current, and selects the adjustable low-dropout voltage regulator U7 to output the corresponding current value through the fifth switch SW5, the sixth switch SW6, the first selection switch SW4, and the second selection switch SW7, and the calculation formula is as follows :
  • the value range of D at this time is 102-1024.
  • the DSP selects the 100K digital potentiometer U3 through the four-channel digital signal isolator U1 and sets the D value of the 100K digital potentiometer U3 through formulas (2) and (4), so that the 100K digital potentiometer U3 outputs the resistance value corresponding to the required current , through the first switch SW1, the second switch SW2, the first selection switch SW4, and the second selection switch SW7 to select the adjustable low-dropout voltage regulator U7 to output the corresponding current value, and the calculation formula is as follows:
  • the value range of D is 103-1024.

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Abstract

A low-current wide-range adjustable pulse constant current source circuit, relating to the technical field of power device static parameter Vgeth testing. The problem that existing constant current sources cannot satisfy the requirement that outputs can be selected continuously, cannot satisfy the requirement that different current values are required because different types of power devices have different Vgeth parameters, and cannot cover all power device tests is solved. The low-current wide-range adjustable pulse constant current source circuit comprises a digital signal isolation circuit, a digital potentiometer output circuit, a switching circuit, and a current source circuit. The digital signal isolation circuit is connected to the digital potentiometer output circuit, and the current source circuit is connected to the digital potentiometer output circuit by means of the switching circuit. The digital signal isolation circuit sends a set current signal value to the digital potentiometer output circuit, the digital potentiometer output circuit cooperates with the switching circuit to output different resistance values, and an output loop of the current source circuit is selected so as to control continuous adjustable constant current output of the constant current source circuit at 10 uA-1 A. The circuit structure is simple, the testing speed is fast, and the output low current 10 uA-1 A is continuous, adjustable, and high-precision.

Description

一种低电流宽范围可调脉冲恒流源电路A Low Current Wide Range Adjustable Pulse Constant Current Source Circuit 技术领域technical field
本发明涉及功率器件静态参数Vgeth测试技术领域，具体来说是一种低电流宽范围可调脉冲恒流源电路。The invention relates to the technical field of Vgeth testing of static parameters of power devices, in particular to a low-current wide-range adjustable pulse constant current source circuit.
背景技术Background technique
现今IGBT(绝缘栅型场效应晶体管)已成为大功率元件的主流，在市场上居于主导地位。由于科技进步，电力电子装置对轻薄短小及高性能之要求，带动及IGBT的发展，尤其应用于电气设备、光电、航天、铁路、电力转换等领域，使半导体开发技术人员在市场需求下，对大功率元件的发展技术，持续在突破。Nowadays, IGBT (Insulated Gate Field Effect Transistor) has become the mainstream of high-power components and occupies a dominant position in the market. Due to scientific and technological progress, the requirements of power electronic devices for light, thin, short, and high performance have driven the development of IGBTs, especially in the fields of electrical equipment, optoelectronics, aerospace, railways, and power conversion. The development technology of high-power components continues to make breakthroughs.
半导体元件除了本身功能要良好之外，其各项参数能否达到电路上的要求，必须定期测量，否则产品的质量特性很难保证，尤其是较大的功率元件，因具有耗损性，易老化及效率降低，因不平衡导致烧毁，甚至在使用中会发生爆炸。所以对新产品及使用中的元件参数的筛选及检查更为重要。针对IGBT而言，IGBT是广泛应用于现代中大功率变换器中的主流半导体开关器件。其中，城市轨道交通车辆的牵引逆变器、辅助逆变器等重要电气设备中，大量使用了IGBT器件，IGBT器件的各种静态参数为使用者可靠选择器件提供了非常直观的参考依据，因此准确测量IGBT的各种静态参数具有极其重要的实际意义。In addition to the good functions of semiconductor components, whether their parameters can meet the requirements of the circuit must be measured regularly, otherwise the quality characteristics of the product are difficult to guarantee, especially the larger power components, due to wear and tear, easy to age And the efficiency is reduced, burning due to imbalance, and even explosion in use. Therefore, it is more important to screen and check the parameters of new products and components in use. For IGBT, IGBT is a mainstream semiconductor switching device widely used in modern medium and high power converters. Among them, IGBT devices are widely used in important electrical equipment such as traction inverters and auxiliary inverters of urban rail transit vehicles. Various static parameters of IGBT devices provide users with a very intuitive reference for reliable selection of devices. Therefore, Accurate measurement of various static parameters of IGBT has extremely important practical significance.
低电流宽范围可调脉冲恒流源是专门针对功率器件静态测试Vgeth(栅 极-发射极阀值电压)参数测量的关键性测试器件；如图3所示，恒流源的主要功能是在被测功率器件C-G短路后输出指定的恒定电流至G-E之间，测量Vge，当Vge保持恒定时的电压即Vgeth。The low-current wide-range adjustable pulse constant current source is a key test device specially for the static test of power devices Vgeth (gate-emitter threshold voltage) parameter measurement; as shown in Figure 3, the main function of the constant current source is to After the power device under test C-G is short-circuited, the specified constant current is output between G-E, and Vge is measured. When Vge remains constant, the voltage is Vgeth.
如图4所示，在目前国标的测试电路中，功率器件静态测试Vgeth参数测量是在C、E之间施加额定电压，通过电压源逐级调压，当电流检测Ice的数值达到预设电流值，记录此时电压检测Vge的数值，即Vgeth，该电路器件多、测试方法复杂。且目前市场上Vgeth测试电路，施加的恒流源输出电流仅满足多个固定值可选择输出，但是不能满足可连续选择输出的要求，无法满足不同型号功率器件Vgeth参数不同而需要的电流值不同的要求，不能覆盖所有功率器件的测试。As shown in Figure 4, in the current national standard test circuit, the Vgeth parameter measurement of the static test of the power device is to apply a rated voltage between C and E, and adjust the voltage step by step through the voltage source. When the value of the current detection Ice reaches the preset current value, record the value of the voltage detection Vge at this time, namely Vgeth, this circuit has many devices and complex testing methods. And the current Vgeth test circuit on the market, the applied constant current source output current can only satisfy multiple fixed values for selectable output, but it cannot meet the requirement of continuous selectable output, and cannot meet the different current values required by different Vgeth parameters of different types of power devices. requirements, which cannot cover the testing of all power devices.
现有技术中，《一种新型连续可调脉冲电流源的设计》(周海兵等，中国科学院半导体研究所)公开了一种新型的数控可调的脉冲电流源，其核心部分是精密恒流源电路和脉冲电流镜电路。精密恒流源电路采用基于运算放大器的深度负反馈技术，提供一个精度高、稳定性好、幅值连续可调的恒定电流输出；脉冲电流镜电路采用高速场效应管实现对恒流源电流的复制和倍乘，降低脉冲电流源输出负载对前级深度负反馈部分的影响，提高电路的稳定性，并利用模拟多路复用器对电流镜栅极的控制，将脉冲信号传递到脉冲电流中，从而输出脉冲电流。In the prior art, "Design of a Novel Continuously Adjustable Pulse Current Source" (Zhou Haibing et al., Institute of Semiconductors, Chinese Academy of Sciences) discloses a new type of numerically controlled adjustable pulse current source, the core part of which is a precision constant current source. source circuit and pulsed current mirror circuit. The precision constant current source circuit adopts the deep negative feedback technology based on the operational amplifier to provide a constant current output with high precision, good stability and continuously adjustable amplitude; Copy and multiply, reduce the impact of the output load of the pulse current source on the negative feedback part of the front stage, improve the stability of the circuit, and use the analog multiplexer to control the gate of the current mirror to transmit the pulse signal to the pulse current , so as to output pulse current.
但是上述文献的技术方案未解决施加的恒流源不能满足可连续选择输出的要求、无法满足不同型号功率器件Vgeth参数不同而需要的电流值不同的要求、以及不能覆盖所有功率器件的测试的问题。However, the technical solutions of the above-mentioned documents do not solve the problems that the applied constant current source cannot meet the requirements of continuous selection of output, cannot meet the requirements of different current values required by different Vgeth parameters of different types of power devices, and cannot cover the test of all power devices. .
发明内容SUMMARY OF THE INVENTION
本发明所要解决的技术问题在于现有恒流源不能连续选择输出、无法满足不同型号功率器件Vgeth参数不同而需要的电流值不同、不能覆盖所有功率器件的测试。The technical problem to be solved by the present invention is that the existing constant current source cannot continuously select the output, cannot meet the different current values required by different Vgeth parameters of different types of power devices, and cannot cover the test of all power devices.
本发明是通过以下技术方案解决上述技术问题的：The present invention solves the above-mentioned technical problems through the following technical solutions:
一种低电流宽范围可调脉冲恒流源电路，包括数字信号隔离电路、数字电位器输出电路、开关切换电路、电流源电路；所述的数字信号隔离电路与数字电位器输出电路连接，所述的电流源电路通过开关切换电路与数字电位器输出电路连接；数字信号隔离电路将设定的电流信号值发送给数字电位器输出电路，数字电位器输出电路与开关切换电路相互配合输出不同的电阻值，选择电流源电路的输出回路，从而控制恒流源电路在10uA-1A持续可调恒定电流输出。A low-current wide-range adjustable pulse constant current source circuit, comprising a digital signal isolation circuit, a digital potentiometer output circuit, a switch switching circuit, and a current source circuit; the digital signal isolation circuit is connected with the digital potentiometer output circuit, so the The above-mentioned current source circuit is connected with the digital potentiometer output circuit through the switch switching circuit; the digital signal isolation circuit sends the set current signal value to the digital potentiometer output circuit, and the digital potentiometer output circuit and the switch switching circuit cooperate with each other to output different values. Resistance value, select the output loop of the current source circuit, so as to control the constant current source circuit to continuously adjust the constant current output at 10uA-1A.
本发明的恒流源电路，通过控制高精度数字电位器输出可调电阻，结合选择不同范围高精度电流源，确保了快速、高精度持续可调恒流源输出；将恒流源输出至被测对象功率器件可直接得到稳定的功率器件静态参数Vgeth值；国标的测试电路中，功率器件静态测试Vgeth参数测量需要持续可调的电压源，并实时检测电流值达到预设电流值，此时施加的电压值即为Vgeth，此方法需要电压及电流值同步检测，对采样速率要求高，实现起来相对成本高，控制复杂。The constant current source circuit of the present invention ensures fast and high-precision continuous adjustable constant current source output by controlling the high-precision digital potentiometer to output adjustable resistance and selecting high-precision current sources of different ranges; The power device under test can directly obtain the stable Vgeth value of the static parameter of the power device; in the test circuit of the national standard, the measurement of the Vgeth parameter of the static test of the power device requires a continuously adjustable voltage source, and the real-time detection current value reaches the preset current value, at this time The applied voltage value is Vgeth. This method requires synchronous detection of voltage and current values, high sampling rate requirements, relatively high implementation cost, and complicated control.
作为本发明技术方案的进一步改进，所述的数字信号隔离电路包括四通道数字信号隔离器(U1)、双通道数字信号隔离器(U2)；所述的数字电位器输出电路包括100K数字电位器(U3)、10K数字电位器(U4)以及1K 数字电位器(U5)；所述的100K数字电位器(U3)与四通道数字信号隔离器(U1)连接；所述的10K数字电位器(U4)分别与四通道数字信号隔离器(U1)和双通道数字信号隔离器(U2)连接；所述的1K数字电位器(U5)分别与四通道数字信号隔离器(U1)和双通道数字信号隔离器(U2)连接。As a further improvement of the technical solution of the present invention, the digital signal isolation circuit includes a four-channel digital signal isolator (U1) and a two-channel digital signal isolator (U2); the digital potentiometer output circuit includes a 100K digital potentiometer (U3), 10K digital potentiometer (U4) and 1K digital potentiometer (U5); the 100K digital potentiometer (U3) is connected to the four-channel digital signal isolator (U1); the 10K digital potentiometer ( U4) are respectively connected with the four-channel digital signal isolator (U1) and the two-channel digital signal isolator (U2); the 1K digital potentiometer (U5) is respectively connected with the four-channel digital signal isolator (U1) and the two-channel digital signal isolator (U2). Signal isolator (U2) connection.
作为本发明技术方案的进一步改进，所述的数字电位器输出电路还包括电容C1，电容C3，所述的电容C1一端连接在100K数字电位器(U3)的7#引脚、另一端接地；所述的电容C3一端连接在10K数字电位器(U4)的7#引脚、另一端接地。As a further improvement of the technical solution of the present invention, the digital potentiometer output circuit also includes a capacitor C1 and a capacitor C3, one end of the capacitor C1 is connected to the 7# pin of the 100K digital potentiometer (U3), and the other end is grounded; One end of the capacitor C3 is connected to the 7# pin of the 10K digital potentiometer (U4), and the other end is grounded.
作为本发明技术方案的进一步改进，所述的开关切换电路包括第一开关(SW1)、第二开关(SW2)、第五开关(SW5)、第六开关(SW6)、第八开关(SW8)、第九开关(SW9)；所述的第一开关(SW1)的1#端子与所述的100K数字电位器(U3)的4#引脚连接，所述的第二开关(SW2)的1#端子与所述的100K数字电位器(U3)的5#引脚连接，所述的第五开关(SW5)的1#端子与所述的10K数字电位器(U4)的2#引脚连接，所述的第六开关(SW6)的1#端子与所述的10K数字电位器(U4)的3#引脚连接，所述的第八开关(SW8)的1#端子与所述的1K数字电位器(U5)的7#引脚连接，所述的第九开关(SW9)的1#端子与所述的1K数字电位器(U5)的1#引脚连接；所述的第一开关(SW1)的2#端子、第五开关(SW5)的2#端子、第八开关(SW8)的2#端子连接在一起，所述的第二开关(SW2)的2#端子、第六开关(SW6)的2#端子、第九开关(SW9)的2#端子连接在一起。As a further improvement of the technical solution of the present invention, the switch switching circuit includes a first switch (SW1), a second switch (SW2), a fifth switch (SW5), a sixth switch (SW6), and an eighth switch (SW8) , the ninth switch (SW9); the 1# terminal of the first switch (SW1) is connected to the 4# pin of the 100K digital potentiometer (U3), and the 1# terminal of the second switch (SW2) The # terminal is connected to the 5# pin of the 100K digital potentiometer (U3), and the 1# terminal of the fifth switch (SW5) is connected to the 2# pin of the 10K digital potentiometer (U4). , the 1# terminal of the sixth switch (SW6) is connected to the 3# pin of the 10K digital potentiometer (U4), and the 1# terminal of the eighth switch (SW8) is connected to the 1K The 7# pin of the digital potentiometer (U5) is connected, and the 1# terminal of the ninth switch (SW9) is connected to the 1# pin of the 1K digital potentiometer (U5); the first switch The 2# terminal of (SW1), the 2# terminal of the fifth switch (SW5), and the 2# terminal of the eighth switch (SW8) are connected together, and the 2# terminal of the second switch (SW2) and the sixth switch The 2# terminal of (SW6) and the 2# terminal of the ninth switch (SW9) are connected together.
作为本发明技术方案的进一步改进，所述的开关切换电路还包括第一选择开关(SW4)、第二选择开关(SW7)；所述的电流源电路包括电流源芯 片(U6)、可调低压降稳压器(U7)、电阻R1；所述的第一选择开关(SW4)的2#端子与所述的第一开关(SW1)的2#端子、第五开关(SW5)的2#端子、第八开关(SW8)的2#端子连接在一起，所述的第一选择开关(SW4)的1#端子连接在电流源芯片(U6)的1#引脚，所述的电阻R1的一端与可调低压降稳压器(U7)的2#引脚连接、电阻R1的另一端与第一选择开关(SW4)的3#端子连接；所述的第二选择开关(SW7)的2#端子与所述的第二开关(SW2)的2#端子、第六开关(SW6)的2#端子、第九开关(SW9)的2#端子连接在一起，所述的第二选择开关(SW7)的1#端子连接在电流源芯片(U6)的2#引脚，第二选择开关(SW7)的3#端子连接在可调低压降稳压器(U7)的1#引脚。As a further improvement of the technical solution of the present invention, the switch switching circuit further includes a first selection switch (SW4) and a second selection switch (SW7); the current source circuit includes a current source chip (U6), which can be lowered Voltage drop regulator (U7), resistor R1; the 2# terminal of the first selection switch (SW4), the 2# terminal of the first switch (SW1), and the 2# terminal of the fifth switch (SW5) The terminal and the 2# terminal of the eighth switch (SW8) are connected together, the 1# terminal of the first selection switch (SW4) is connected to the 1# pin of the current source chip (U6), the resistance R1 One end is connected to the 2# pin of the adjustable low dropout voltage regulator (U7), and the other end of the resistor R1 is connected to the 3# terminal of the first selection switch (SW4); the second selection switch (SW7) The 2# terminal is connected with the 2# terminal of the second switch (SW2), the 2# terminal of the sixth switch (SW6), and the 2# terminal of the ninth switch (SW9), and the second selection switch The 1# terminal of (SW7) is connected to the 2# pin of the current source chip (U6), and the 3# terminal of the second selection switch (SW7) is connected to the 1# pin of the adjustable low drop voltage regulator (U7). .
作为本发明技术方案的进一步改进，所述的电流源电路还包括模拟选择开关(SW3)、MOSFET功率器件(Q1)，电阻R2、功率器件控制信号发生器；电容C2、电容C4；所述的模拟选择开关(SW3)的2#端子与电流源芯片(U6)的1#引脚连接，模拟选择开关(SW3)的1#端子与MOSFET功率器件(Q1)的漏极连接，模拟选择开关(SW3)的3#端子接地，MOSFET功率器件(Q1)的源极接地；所述的电容C2的一端连接在电流源芯片(U6)的3#引脚，另一端接地；所述的电容C4的一端连接在可调低压降稳压器(U7)的3#引脚，另一端接地；所述的电阻R1的一端与可调低压降稳压器(U7)的2#引脚连接，电阻R1的另一端与MOSFET功率器件(Q1)的漏极连接；所述的电阻R2并联在MOSFET功率器件(Q1)的栅极与源极之间，所述的功率器件控制信号发生器并联在电阻R2的两端。As a further improvement of the technical solution of the present invention, the current source circuit further includes an analog selection switch (SW3), a MOSFET power device (Q1), a resistor R2, a power device control signal generator; a capacitor C2 and a capacitor C4; The 2# terminal of the analog selection switch (SW3) is connected to the 1# pin of the current source chip (U6), the 1# terminal of the analog selection switch (SW3) is connected to the drain of the MOSFET power device (Q1), and the analog selection switch ( The 3# terminal of SW3) is grounded, and the source of the MOSFET power device (Q1) is grounded; one end of the capacitor C2 is connected to the 3# pin of the current source chip (U6), and the other end is grounded; the capacitor C4 is connected to the ground. One end is connected to the 3# pin of the adjustable low dropout regulator (U7), and the other end is grounded; one end of the resistor R1 is connected to the 2# pin of the adjustable low dropout regulator (U7), The other end of the resistor R1 is connected with the drain of the MOSFET power device (Q1); the resistor R2 is connected in parallel between the gate and the source of the MOSFET power device (Q1), and the power device control signal generator is connected in parallel. across the resistor R2.
作为本发明技术方案的进一步改进，所述的恒流源电路在10uA-1A持 续可调恒定电流输出，分5段组合的方式实现：As a further improvement of the technical solution of the present invention, the described constant current source circuit is continuously adjustable constant current output at 10uA-1A, and is realized by a combination of 5 sections:
1)10uA-0.06mA持续可调电流输出1) 10uA-0.06mA continuous adjustable current output
四通道数字信号隔离器(U1)选择100K数字电位器(U3)，并通过公式(1)和(2)设定100K数字电位器(U3)的D值，从而使100K数字电位器(U3)输出需求电流对应的电阻值，通过第一开关(SW1)、第二开关(SW2)、第一选择开关(SW4)、第二选择开关(SW7)选择电流源芯片(U6)输出相应的电流值，计算公式如下：The four-channel digital signal isolator (U1) selects the 100K digital potentiometer (U3), and sets the D value of the 100K digital potentiometer (U3) through formulas (1) and (2), so that the 100K digital potentiometer (U3) Output the resistance value corresponding to the required current, and select the current source chip (U6) to output the corresponding current value through the first switch (SW1), the second switch (SW2), the first selection switch (SW4), and the second selection switch (SW7) ,Calculated as follows:
Iout＝67.7/RSET(D)                  (1)Iout=67.7/RSET(D) (1)
RSET(D)＝D*100K/1024                (2)RSET(D)=D*100K/1024 (2)
其中，Iout为输出的电流值，RSET(D)为设置电阻值，67.7为电流源芯片(U6)的额定输出值，D为十进制数值，此时，取值范围为1-69；Among them, Iout is the output current value, RSET(D) is the set resistance value, 67.7 is the rated output value of the current source chip (U6), D is the decimal value, at this time, the value range is 1-69;
2)0.06mA-1mA持续可调电流输出2) 0.06mA-1mA continuous adjustable current output
四通道数字信号隔离器(U1)、双通道数字信号隔离器(U2)选择1K数字电位器(U5)并通过公式(1)和(3)设定1K数字电位器(U5)的D值，从而使1K数字电位器(U5)输出需求电流对应的电阻值，通过第八开关(SW8)、第九开关(SW9)、第一选择开关(SW4)、第二选择开关(SW7)选择电流源芯片(U6)输出相应的电流值，计算公式如下：The four-channel digital signal isolator (U1) and the two-channel digital signal isolator (U2) select the 1K digital potentiometer (U5) and set the D value of the 1K digital potentiometer (U5) through formulas (1) and (3). Thus, the 1K digital potentiometer (U5) outputs the resistance value corresponding to the required current, and the current source is selected through the eighth switch (SW8), the ninth switch (SW9), the first selection switch (SW4), and the second selection switch (SW7). The chip (U6) outputs the corresponding current value, and the calculation formula is as follows:
Iout＝67.7/RSET(D)                  (1)Iout=67.7/RSET(D) (1)
RSET(D)＝D*1K/256                  (3)RSET(D)=D*1K/256 (3)
其中，此时D取值范围为17-256；Among them, the value range of D is 17-256 at this time;
3)1mA-10mA持续可调电流输出3) 1mA-10mA continuously adjustable current output
四通道数字信号隔离器(U1)、双通道数字信号隔离器(U2)选择1K 数字电位器(U5)并通过公式(3)和(4)设定1K数字电位器(U5)的D值，从而使1K数字电位器(U5)输出需求电流对应的电阻值，通过第八开关(SW8)、第九开关(SW9)、第一选择开关(SW4)、第二选择开关(SW7)选择可调低压降稳压器(U7)输出相应的电流值，计算公式如下：The four-channel digital signal isolator (U1) and the two-channel digital signal isolator (U2) select the 1K digital potentiometer (U5) and set the D value of the 1K digital potentiometer (U5) through formulas (3) and (4). Thus, the 1K digital potentiometer (U5) outputs the resistance value corresponding to the required current, which can be adjusted through the eighth switch (SW8), the ninth switch (SW9), the first selection switch (SW4), and the second selection switch (SW7). The low dropout voltage regulator (U7) outputs the corresponding current value, and the calculation formula is as follows:
RSET(D)＝D*1K/256                  (3)RSET(D)=D*1K/256 (3)
Iout＝RSET(D)*10                   (4)Iout=RSET(D)*10 (4)
其中，10为可调低压降稳压器(U7)额定输出值，此时D取值范围为26-256；Among them, 10 is the rated output value of the adjustable low-dropout voltage regulator (U7), and the value range of D is 26-256;
4)10mA-100mA持续可调电流输出4) 10mA-100mA continuous adjustable current output
四通道数字信号隔离器(U1)、双通道数字信号隔离器(U2)选择10K数字电位器(U4)并通过公式(4)和(5)设定10K数字电位器(U4)的D值，从而使10K数字电位器(U4)输出需求电流对应的电阻值，通过第五开关(SW5)、第六开关(SW6)、第一选择开关(SW4)、第二选择开关(SW7)选择可调低压降稳压器(U7)输出相应的电流值，计算公式如下：The four-channel digital signal isolator (U1) and the two-channel digital signal isolator (U2) select the 10K digital potentiometer (U4) and set the D value of the 10K digital potentiometer (U4) through formulas (4) and (5). Thus, the 10K digital potentiometer (U4) outputs the resistance value corresponding to the required current, which can be adjusted through the fifth switch (SW5), the sixth switch (SW6), the first selection switch (SW4), and the second selection switch (SW7). The low dropout voltage regulator (U7) outputs the corresponding current value, and the calculation formula is as follows:
Iout＝RSET(D)*10                   (4)Iout=RSET(D)*10 (4)
RSET(D)＝D*10K/1024                 (5)RSET(D)=D*10K/1024 (5)
其中，此时D的取值范围为102-1024；Among them, the value range of D at this time is 102-1024;
5)100mA-1A持续可调电流输出5) 100mA-1A continuous adjustable current output
四通道数字信号隔离器(U1)选择100K数字电位器(U3)并通过公式(2)和(4)设定100K数字电位器(U3)的D值，从而使100K数字电位器(U3)输出需求电流对应的电阻值，通过第一开关(SW1)、第二开关(SW2)、第一选择开关(SW4)、第二选择开关(SW7)选择可调低压降稳压器(U7) 输出相应的电流值，计算公式如下：The four-channel digital signal isolator (U1) selects the 100K digital potentiometer (U3) and sets the D value of the 100K digital potentiometer (U3) through formulas (2) and (4), so that the 100K digital potentiometer (U3) outputs The resistance value corresponding to the demand current is selected by the first switch (SW1), the second switch (SW2), the first selection switch (SW4), and the second selection switch (SW7) to select the output of the adjustable low-dropout regulator (U7) The corresponding current value, the calculation formula is as follows:
RSET(D)＝D*100K/1024                (2)RSET(D)=D*100K/1024 (2)
Iout＝RSET(D)*10                   (4)Iout=RSET(D)*10 (4)
其中，D取值范围为103-1024。Among them, the value range of D is 103-1024.
作为本发明技术方案的进一步改进，所述四通道数字信号隔离器(U1)型号为ADUM141E，所述双通道数字信号隔离器(U2)型号为ADUM1200。As a further improvement of the technical solution of the present invention, the model of the four-channel digital signal isolator (U1) is ADUM141E, and the model of the two-channel digital signal isolator (U2) is ADUM1200.
作为本发明技术方案的进一步改进，所述100K数字电位器(U3)型号为AD5293，所述10K数字电位器(U4)型号为AD5174，所述1K数字电位器(U5)型号为AD8400。As a further improvement of the technical solution of the present invention, the model of the 100K digital potentiometer (U3) is AD5293, the model of the 10K digital potentiometer (U4) is AD5174, and the model of the 1K digital potentiometer (U5) is AD8400.
作为本发明技术方案的进一步改进，所述电流源芯片(U6)型号为LM334；所述可调低压降稳压器(U7)型号为LT3080；所述的模拟选择开关(SW3)型号为ADG5419；所述的MOSFET功率器件(Q1)的型号为FQP50N06。As a further improvement of the technical solution of the present invention, the model of the current source chip (U6) is LM334; the model of the adjustable low dropout voltage regulator (U7) is LT3080; the model of the analog selection switch (SW3) is ADG5419 ; The model of the MOSFET power device (Q1) is FQP50N06.
本发明的优点在于：The advantages of the present invention are:
(1)本发明的恒流源电路，通过控制高精度数字电位器输出可调电阻，结合选择不同范围高精度电流源，确保了快速、高精度持续可调恒流源输出；将恒流源输出至被测对象功率器件可直接得到稳定的功率器件静态参数Vgeth值；国标的测试电路中，功率器件静态测试Vgeth参数测量需要持续可调的电压源，并实时检测电流值达到预设电流值，此时施加的电压值即为Vgeth，此方法需要电压及电流值同步检测，对采样速率要求高，实现起来相对成本高，控制复杂。(1) The constant current source circuit of the present invention, by controlling the high-precision digital potentiometer to output adjustable resistance, combined with the selection of high-precision current sources of different ranges, ensures fast and high-precision continuous adjustable constant current source output; Output to the power device under test can directly obtain the stable Vgeth value of the static parameter of the power device; in the test circuit of the national standard, the measurement of the Vgeth parameter of the static test of the power device requires a continuously adjustable voltage source, and the real-time detection current value reaches the preset current value , the voltage value applied at this time is Vgeth, this method requires synchronous detection of voltage and current values, high sampling rate requirements, relatively high implementation cost, and complicated control.
(2)恒流源输出低电流10uA-1A连续可调、输出精度高。恒流源输出大多为单一不可调或者分多档调节。通过对1K、10K、100K三种高精度数 字电位器编程控制输出连续可调的电阻值，结合高低两种电流范围的电源芯片不同组合的方式，从而输出宽范围低电流连续可调且精度高的恒流源输出。(2) Constant current source output low current 10uA-1A continuously adjustable, high output precision. The output of the constant current source is mostly single non-adjustable or multi-level adjustment. Through the programming and control of three high-precision digital potentiometers, 1K, 10K, and 100K, the output continuously adjustable resistance value, combined with different combinations of power chips with high and low current ranges, so as to output a wide range of low current continuously adjustable and high precision The constant current source output.
附图说明Description of drawings
图1为本发明实施例的一种低电流宽范围可调脉冲恒流源电路的数字信号隔离电路图；1 is a digital signal isolation circuit diagram of a low-current wide-range adjustable pulse constant current source circuit according to an embodiment of the present invention;
图2为本发明实施例的一种低电流宽范围可调脉冲恒流源电路主电路图；2 is a main circuit diagram of a low-current wide-range adjustable pulse constant current source circuit according to an embodiment of the present invention;
图3为国标Vgeth参数测试方法的电路原理图；Fig. 3 is the circuit schematic diagram of the national standard Vgeth parameter test method;
图4为应用宽范围可调恒流源Vgeth参数测试方法的电路原理图。Fig. 4 is the circuit schematic diagram of applying the Vgeth parameter test method of wide-range adjustable constant current source.
具体实施方式Detailed ways
为使本发明实施例的目的、技术方案和优点更加清楚，下面将结合本发明实施例，对本发明实施例中的技术方案进行清楚、完整地描述。基于本发明中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
下面结合说明书附图以及具体的实施例对本发明的技术方案作进一步描述：The technical solutions of the present invention are further described below in conjunction with the accompanying drawings and specific embodiments:
实施例一Example 1
如图1和图2所示，一种低电流宽范围可调脉冲恒流源电路，包括数字信号隔离电路、数字电位器输出电路、开关切换电路、电流源电路；所 述的数字信号隔离电路与数字电位器输出电路连接，所述的电流源电路通过开关切换电路与数字电位器输出电路连接；被测IGBT功率器件DUT1通过模拟选择开关SW3或者MOSFET功率器件Q1与电流源电路连接。As shown in Figure 1 and Figure 2, a low-current wide-range adjustable pulse constant current source circuit includes a digital signal isolation circuit, a digital potentiometer output circuit, a switch switching circuit, and a current source circuit; the digital signal isolation circuit It is connected with the digital potentiometer output circuit, and the current source circuit is connected with the digital potentiometer output circuit through the switch switching circuit; the tested IGBT power device DUT1 is connected with the current source circuit through the analog selection switch SW3 or the MOSFET power device Q1.
如图1所示，所述的数字信号隔离电路包括包括四通道数字信号隔离器U1、双通道数字信号隔离器U2；所述四通道数字信号隔离器U1型号为ADUM141E，双通道数字信号隔离器U2型号为ADUM1200；所述的四通道数字信号隔离器U1、双通道数字信号隔离器U2的信号输入端分别通过SPI通讯与DSP控制器连接，所述的四通道数字信号隔离器U1、双通道数字信号隔离器U2的信号输出端分别与100K数字电位器U3、10K数字电位器U4以及1K数字电位器U5连接。As shown in FIG. 1 , the digital signal isolation circuit includes a four-channel digital signal isolator U1 and a two-channel digital signal isolator U2; the four-channel digital signal isolator U1 is ADUM141E, a two-channel digital signal isolator The model of U2 is ADUM1200; the signal input terminals of the four-channel digital signal isolator U1 and the two-channel digital signal isolator U2 are respectively connected to the DSP controller through SPI communication, and the four-channel digital signal isolator U1 and the two-channel digital signal isolator U1 and the two-channel digital signal isolator. The signal output ends of the digital signal isolator U2 are respectively connected with the 100K digital potentiometer U3, the 10K digital potentiometer U4 and the 1K digital potentiometer U5.
如图2所示，所述的数字电位器输出电路包括100K数字电位器U3以及外接电容C1，10K数字电位器U4以及外接电容C3，1K数字电位器U5；所述100K数字电位器U3型号为AD5293，所述10K数字电位器U4型号为AD5174，所述1K数字电位器U5型号为AD8400。As shown in Figure 2, the digital potentiometer output circuit includes a 100K digital potentiometer U3 and an external capacitor C1, a 10K digital potentiometer U4 and an external capacitor C3, and a 1K digital potentiometer U5; the model of the 100K digital potentiometer U3 is AD5293, the model of the 10K digital potentiometer U4 is AD5174, and the model of the 1K digital potentiometer U5 is AD8400.
开关切换电路包括第一开关SW1、第二开关SW2、第五开关SW5、第六开关SW6、第八开关SW8、第九开关SW9，第一选择开关SW4、第二选择开关SW7，通过开关组合切换匹配不同的电阻值和选择电流源电路。The switch switching circuit includes a first switch SW1, a second switch SW2, a fifth switch SW5, a sixth switch SW6, an eighth switch SW8, a ninth switch SW9, a first selection switch SW4, and a second selection switch SW7, which are switched by switch combinations. Match different resistor values and select current source circuits.
电流源电路包括电流源芯片U6、可调低压降稳压器U7、电容C2、电容C4、模拟选择开关SW3、MOSFET功率器件Q1、电阻R1、电阻R2、功率器件控制信号发生器；所述电流源芯片U6型号为LM334；所述可调低压降稳压器U7型号为LT3080；所述控制电流源芯片U6输出电流通断的模拟选择开关SW3型号为ADG5419；所述控制可调低压降稳压器U7输出电流通断的 MOSFET功率器件Q1为，其型号为FQP50N06。The current source circuit includes a current source chip U6, an adjustable low-dropout voltage regulator U7, a capacitor C2, a capacitor C4, an analog selection switch SW3, a MOSFET power device Q1, a resistor R1, a resistor R2, and a power device control signal generator; the The model of the current source chip U6 is LM334; the model of the adjustable low dropout voltage regulator U7 is LT3080; the model of the analog selection switch SW3 that controls the output current of the current source chip U6 is ADG5419; the model of the control adjustable low voltage is ADG5419 The MOSFET power device Q1 that drops the output current of the voltage regulator U7 is FQP50N06.
所述的100K数字电位器U3与四通道数字信号隔离器U1连接；所述的10K数字电位器U4分别与四通道数字信号隔离器U1和双通道数字信号隔离器U2连接；所述的1K数字电位器U5分别与四通道数字信号隔离器U1和双通道数字信号隔离器U2连接；所述的电容C1一端连接在100K数字电位器U3的7#引脚、另一端接地；所述的电容C3一端连接在10K数字电位器U4的7#引脚、另一端接地。The 100K digital potentiometer U3 is connected with the four-channel digital signal isolator U1; the 10K digital potentiometer U4 is respectively connected with the four-channel digital signal isolator U1 and the two-channel digital signal isolator U2; the 1K digital The potentiometer U5 is respectively connected with the four-channel digital signal isolator U1 and the two-channel digital signal isolator U2; one end of the capacitor C1 is connected to the 7# pin of the 100K digital potentiometer U3, and the other end is grounded; the capacitor C3 One end is connected to the 7# pin of the 10K digital potentiometer U4, and the other end is grounded.
所述的第一开关SW1的1#端子与所述的100K数字电位器U3的4#引脚连接，所述的第二开关SW2的1#端子与所述的100K数字电位器U3的5#引脚连接，所述的第五开关SW5的1#端子与所述的10K数字电位器U4的2#引脚连接，所述的第六开关SW6的1#端子与所述的10K数字电位器U4的3#引脚连接，所述的第八开关SW8的1#端子与所述的1K数字电位器U5的7#引脚连接，所述的第九开关SW9的1#端子与所述的1K数字电位器U5的1#引脚连接；所述的第一开关SW1的2#端子、第五开关SW5的2#端子、第八开关SW8的2#端子连接在一起，所述的第二开关SW2的2#端子、第六开关SW6的2#端子、第九开关SW9的2#端子连接在一起。The 1# terminal of the first switch SW1 is connected to the 4# pin of the 100K digital potentiometer U3, and the 1# terminal of the second switch SW2 is connected to the 5# pin of the 100K digital potentiometer U3. The pins are connected, the 1# terminal of the fifth switch SW5 is connected to the 2# pin of the 10K digital potentiometer U4, and the 1# terminal of the sixth switch SW6 is connected to the 10K digital potentiometer. The 3# pin of U4 is connected, the 1# terminal of the eighth switch SW8 is connected to the 7# pin of the 1K digital potentiometer U5, and the 1# terminal of the ninth switch SW9 is connected to the The 1# pin of the 1K digital potentiometer U5 is connected; the 2# terminal of the first switch SW1, the 2# terminal of the fifth switch SW5, and the 2# terminal of the eighth switch SW8 are connected together, and the second The 2# terminal of the switch SW2, the 2# terminal of the sixth switch SW6, and the 2# terminal of the ninth switch SW9 are connected together.
所述的第一选择开关SW4的2#端子与所述的第一开关SW1的2#端子、第五开关SW5的2#端子、第八开关SW8的2#端子连接在一起，所述的第一选择开关SW4的1#端子连接在电流源芯片U6的1#引脚，第一选择开关SW4的3#端子与MOSFET功率器件Q1的漏极连接。The 2# terminal of the first selection switch SW4 is connected with the 2# terminal of the first switch SW1, the 2# terminal of the fifth switch SW5, and the 2# terminal of the eighth switch SW8. The 1# terminal of a selection switch SW4 is connected to the 1# pin of the current source chip U6, and the 3# terminal of the first selection switch SW4 is connected to the drain of the MOSFET power device Q1.
所述的第二选择开关SW7的2#端子与所述的第二开关SW2的2#端子、第六开关SW6的2#端子、第九开关SW9的2#端子连接在一起，所述的第二 选择开关SW7的1#端子连接在电流源芯片U6的2#引脚，第二选择开关SW7的3#端子连接在可调低压降稳压器U7的1#引脚。The 2# terminal of the second selection switch SW7 is connected with the 2# terminal of the second switch SW2, the 2# terminal of the sixth switch SW6, and the 2# terminal of the ninth switch SW9. The 1# terminal of the second selection switch SW7 is connected to the 2# pin of the current source chip U6, and the 3# terminal of the second selection switch SW7 is connected to the 1# pin of the adjustable low dropout voltage regulator U7.
所述的电容C2的一端连接在电流源芯片U6的3#引脚，另一端接地；所述的电容C4的一端连接在可调低压降稳压器U7的3#引脚，另一端接地；所述的电阻R1的一端与可调低压降稳压器U7的2#引脚连接，电阻R1的另一端与MOSFET功率器件Q1的漏极连接；所述的电阻R2并联在MOSFET功率器件Q1的栅极与源极之间，所述的功率器件控制信号发生器并联在电阻R2的两端，MOSFET功率器件Q1的源极接地；所述的模拟选择开关SW3的2#端子与电流源芯片U6的1#引脚连接，模拟选择开关SW3的1#端子与MOSFET功率器件Q1的漏极连接，模拟选择开关SW3的3#端子接地。One end of the capacitor C2 is connected to the 3# pin of the current source chip U6, and the other end is grounded; one end of the capacitor C4 is connected to the 3# pin of the adjustable low drop voltage regulator U7, and the other end is grounded ; One end of the described resistor R1 is connected with the 2# pin of the adjustable low-dropout voltage regulator U7, and the other end of the resistor R1 is connected with the drain of the MOSFET power device Q1; the described resistor R2 is connected in parallel with the MOSFET power device Between the gate and the source of Q1, the power device control signal generator is connected in parallel with both ends of the resistor R2, and the source of the MOSFET power device Q1 is grounded; the 2# terminal of the analog selection switch SW3 is connected to the current source The 1# pin of the chip U6 is connected, the 1# terminal of the analog selection switch SW3 is connected to the drain of the MOSFET power device Q1, and the 3# terminal of the analog selection switch SW3 is grounded.
上位机将设定的电流信号值发送给DSP控制器，DSP控制器通过SPI通讯方式将电流信号值发送给数字信号隔离电路，数字信号隔离电路将电流信号值发送给数字电位器输出电路，数字电位器输出电路将电流信号值对应的电阻值通过选择100K数字电位器U3、10K数字电位器U4或1K数字电位器U5输出，并通过开关切换电路选择电流源芯片U6或可调低压降稳压器U7实现10uA-1A持续可调恒定电流输出。The host computer sends the set current signal value to the DSP controller, the DSP controller sends the current signal value to the digital signal isolation circuit through SPI communication, and the digital signal isolation circuit sends the current signal value to the digital potentiometer output circuit. The potentiometer output circuit outputs the resistance value corresponding to the current signal value by selecting the 100K digital potentiometer U3, 10K digital potentiometer U4 or 1K digital potentiometer U5, and selects the current source chip U6 or the adjustable low voltage drop through the switch switching circuit. The voltage regulator U7 realizes 10uA-1A continuously adjustable constant current output.
本发明实施例中分5段组合的方式实现10uA-1A持续可调恒流源输出，分别为：In the embodiment of the present invention, the output of 10uA-1A continuously adjustable constant current source is realized by a combination of 5 sections, which are:
(1)10uA-0.06mA持续可调电流输出(1) 10uA-0.06mA continuous adjustable current output
DSP通过四通道数字信号隔离器U1选择100K数字电位器U3，并通过公式(1)和(2)设定100K数字电位器U3的D值，从而使100K数字电位器U3输出需求电流对应的电阻值，通过第一开关SW1、第二开关SW2、第 一选择开关SW4、第二选择开关SW7选择电流源芯片U6输出相应的电流值，计算公式如下：The DSP selects the 100K digital potentiometer U3 through the four-channel digital signal isolator U1, and sets the D value of the 100K digital potentiometer U3 through formulas (1) and (2), so that the 100K digital potentiometer U3 outputs the resistance corresponding to the required current value, through the first switch SW1, the second switch SW2, the first selection switch SW4, the second selection switch SW7 to select the current source chip U6 to output the corresponding current value, the calculation formula is as follows:
Iout＝67.7/RSET(D)                 (1)Iout=67.7/RSET(D) (1)
RSET(D)＝D*100K/1024                (2)RSET(D)=D*100K/1024 (2)
其中，Iout为输出的电流值，RSET(D)为设置电阻值，67.7为电流源芯片U6的额定输出值，D为十进制数值，此时，取值范围为1-69。Among them, Iout is the output current value, RSET(D) is the set resistance value, 67.7 is the rated output value of the current source chip U6, D is the decimal value, at this time, the value range is 1-69.
(2)0.06mA-1mA持续可调电流输出(2) 0.06mA-1mA continuous adjustable current output
DSP通过四通道数字信号隔离器U1、双通道数字信号隔离器U2选择1K数字电位器U5并通过公式(1)和(3)设定1K数字电位器U5的D值，从而使1K数字电位器U5输出需求电流对应的电阻值，通过第八开关SW8、第九开关SW9、第一选择开关SW4、第二选择开关SW7选择电流源芯片U6输出相应的电流值，计算公式如下：The DSP selects the 1K digital potentiometer U5 through the four-channel digital signal isolator U1 and the two-channel digital signal isolator U2, and sets the D value of the 1K digital potentiometer U5 through formulas (1) and (3), so that the 1K digital potentiometer U5 outputs the resistance value corresponding to the required current, and selects the current source chip U6 to output the corresponding current value through the eighth switch SW8, the ninth switch SW9, the first selection switch SW4, and the second selection switch SW7, and the calculation formula is as follows:
Iout＝67.7/RSET(D)                 (1)Iout=67.7/RSET(D) (1)
RSET(D)＝D*1K/256                  (3)RSET(D)=D*1K/256 (3)
其中，此时D取值范围为17-256。Among them, the value range of D is 17-256 at this time.
(3)1mA-10mA持续可调电流输出(3) 1mA-10mA continuous adjustable current output
DSP通过四通道数字信号隔离器U1、双通道数字信号隔离器U2选择1K数字电位器U5并通过公式(3)和(4)设定1K数字电位器U5的D值，从而使1K数字电位器U5输出需求电流对应的电阻值，通过第八开关SW8、第九开关SW9、第一选择开关SW4、第二选择开关SW7选择可调低压降稳压器U7输出相应的电流值，计算公式如下:The DSP selects the 1K digital potentiometer U5 through the four-channel digital signal isolator U1 and the two-channel digital signal isolator U2, and sets the D value of the 1K digital potentiometer U5 through formulas (3) and (4), so that the 1K digital potentiometer U5 outputs the resistance value corresponding to the required current, and selects the adjustable low-dropout voltage regulator U7 to output the corresponding current value through the eighth switch SW8, the ninth switch SW9, the first selection switch SW4, and the second selection switch SW7, and the calculation formula is as follows :
RSET(D)＝D*1K/256                  (3)RSET(D)=D*1K/256 (3)
Iout＝RSET(D)*10                  (4)Iout=RSET(D)*10 (4)
其中，10为可调低压降稳压器U7额定输出值，此时D取值范围为26-256。Among them, 10 is the rated output value of the adjustable low-dropout voltage regulator U7, and the value range of D is 26-256 at this time.
(4)10mA-100mA持续可调电流输出(4) 10mA-100mA continuous adjustable current output
DSP通过四通道数字信号隔离器U1、双通道数字信号隔离器U2选择10K数字电位器U4并通过公式(4)和(5)设定10K数字电位器U4的D值，从而使10K数字电位器U4输出需求电流对应的电阻值，通过第五开关SW5、第六开关SW6、第一选择开关SW4、第二选择开关SW7选择可调低压降稳压器U7输出相应的电流值，计算公式如下：The DSP selects the 10K digital potentiometer U4 through the four-channel digital signal isolator U1 and the two-channel digital signal isolator U2, and sets the D value of the 10K digital potentiometer U4 through formulas (4) and (5), so that the 10K digital potentiometer U4 outputs the resistance value corresponding to the required current, and selects the adjustable low-dropout voltage regulator U7 to output the corresponding current value through the fifth switch SW5, the sixth switch SW6, the first selection switch SW4, and the second selection switch SW7, and the calculation formula is as follows :
Iout＝RSET(D)*10                  (4)Iout=RSET(D)*10 (4)
RSET(D)＝D*10K/1024                (5)RSET(D)=D*10K/1024 (5)
其中，此时D的取值范围为102-1024。Among them, the value range of D at this time is 102-1024.
(5)100mA-1A持续可调电流输出(5) 100mA-1A continuous adjustable current output
DSP通过四通道数字信号隔离器U1选择100K数字电位器U3并通过公式(2)和(4)设定100K数字电位器U3的D值，从而使100K数字电位器U3输出需求电流对应的电阻值，通过第一开关SW1、第二开关SW2、第一选择开关SW4、第二选择开关SW7选择可调低压降稳压器U7输出相应的电流值，计算公式如下:The DSP selects the 100K digital potentiometer U3 through the four-channel digital signal isolator U1 and sets the D value of the 100K digital potentiometer U3 through formulas (2) and (4), so that the 100K digital potentiometer U3 outputs the resistance value corresponding to the required current , through the first switch SW1, the second switch SW2, the first selection switch SW4, and the second selection switch SW7 to select the adjustable low-dropout voltage regulator U7 to output the corresponding current value, and the calculation formula is as follows:
RSET(D)＝D*100K/1024                (2)RSET(D)=D*100K/1024 (2)
Iout＝RSET(D)*10                   (4)Iout=RSET(D)*10 (4)
其中，D取值范围为103-1024。Among them, the value range of D is 103-1024.
以上实施例仅用以说明本发明的技术方案，而非对其限制；尽管参照 前述实施例对本发明进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本发明各实施例技术方案的精神和范围。The above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: The recorded technical solutions are modified, or some technical features thereof are equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (10)

  1. 一种低电流宽范围可调脉冲恒流源电路，其特征在于，包括数字信号隔离电路、数字电位器输出电路、开关切换电路、电流源电路；所述的数字信号隔离电路与数字电位器输出电路连接，所述的电流源电路通过开关切换电路与数字电位器输出电路连接；数字信号隔离电路将设定的电流信号值发送给数字电位器输出电路，数字电位器输出电路与开关切换电路相互配合输出不同的电阻值，选择电流源电路的输出回路，从而控制恒流源电路在10uA-1A持续可调恒定电流输出。A low-current wide-range adjustable pulse constant current source circuit is characterized in that it includes a digital signal isolation circuit, a digital potentiometer output circuit, a switch switching circuit, and a current source circuit; the digital signal isolation circuit and the digital potentiometer output Circuit connection, the current source circuit is connected with the digital potentiometer output circuit through the switch switching circuit; the digital signal isolation circuit sends the set current signal value to the digital potentiometer output circuit, and the digital potentiometer output circuit and the switch switching circuit are mutually connected. With the output of different resistance values, select the output loop of the current source circuit, so as to control the constant current source circuit to continuously adjust the constant current output at 10uA-1A.
  2. 根据权利要求1所述的一种低电流宽范围可调脉冲恒流源电路，其特征在于，所述的数字信号隔离电路包括包括四通道数字信号隔离器(U1)、双通道数字信号隔离器(U2)；所述的数字电位器输出电路包括100K数字电位器(U3)、10K数字电位器(U4)以及1K数字电位器(U5)；所述的100K数字电位器(U3)与四通道数字信号隔离器(U1)连接；所述的10K数字电位器(U4)分别与四通道数字信号隔离器(U1)和双通道数字信号隔离器(U2)连接；所述的1K数字电位器(U5)分别与四通道数字信号隔离器(U1)和双通道数字信号隔离器(U2)连接。The low-current wide-range adjustable pulse constant current source circuit according to claim 1, wherein the digital signal isolation circuit comprises a four-channel digital signal isolator (U1), a two-channel digital signal isolator (U2); the digital potentiometer output circuit includes a 100K digital potentiometer (U3), a 10K digital potentiometer (U4) and a 1K digital potentiometer (U5); the 100K digital potentiometer (U3) and the four-channel The digital signal isolator (U1) is connected; the 10K digital potentiometer (U4) is respectively connected with the four-channel digital signal isolator (U1) and the two-channel digital signal isolator (U2); the 1K digital potentiometer ( U5) is respectively connected with the four-channel digital signal isolator (U1) and the two-channel digital signal isolator (U2).
  3. 根据权利要求2所述的一种低电流宽范围可调脉冲恒流源电路，其特征在于，所述的数字电位器输出电路还包括电容C1，电容C3，所述的电容C1一端连接在100K数字电位器(U3)的7#引脚、另一端接地；所述的电容C3一端连接在10K数字电位器(U4)的7#引脚、另一端接地。A low-current wide-range adjustable pulse constant current source circuit according to claim 2, wherein the digital potentiometer output circuit further comprises a capacitor C1 and a capacitor C3, and one end of the capacitor C1 is connected to the 100K The 7# pin of the digital potentiometer (U3) and the other end are grounded; one end of the capacitor C3 is connected to the 7# pin of the 10K digital potentiometer (U4), and the other end is grounded.
  4. 根据权利要求2所述的一种低电流宽范围可调脉冲恒流源电路，其特征在于，所述的开关切换电路包括第一开关(SW1)、第二开关(SW2)、第五开关(SW5)、第六开关(SW6)、第八开关(SW8)、第九开关(SW9)； 所述的第一开关(SW1)的1#端子与所述的100K数字电位器(U3)的4#引脚连接，所述的第二开关(SW2)的1#端子与所述的100K数字电位器(U3)的5#引脚连接，所述的第五开关(SW5)的1#端子与所述的10K数字电位器(U4)的2#引脚连接，所述的第六开关(SW6)的1#端子与所述的10K数字电位器(U4)的3#引脚连接，所述的第八开关(SW8)的1#端子与所述的1K数字电位器(U5)的7#引脚连接，所述的第九开关(SW9)的1#端子与所述的1K数字电位器(U5)的1#引脚连接；所述的第一开关(SW1)的2#端子、第五开关(SW5)的2#端子、第八开关(SW8)的2#端子连接在一起，所述的第二开关(SW2)的2#端子、第六开关(SW6)的2#端子、第九开关(SW9)的2#端子连接在一起。The low-current wide-range adjustable pulse constant current source circuit according to claim 2, wherein the switch switching circuit comprises a first switch (SW1), a second switch (SW2), a fifth switch ( SW5), sixth switch (SW6), eighth switch (SW8), ninth switch (SW9); 1# terminal of the first switch (SW1) and 4 of the 100K digital potentiometer (U3) # pin connection, the 1# terminal of the second switch (SW2) is connected to the 5# pin of the 100K digital potentiometer (U3), and the 1# terminal of the fifth switch (SW5) is connected to The 2# pin of the 10K digital potentiometer (U4) is connected, and the 1# terminal of the sixth switch (SW6) is connected to the 3# pin of the 10K digital potentiometer (U4). The 1# terminal of the eighth switch (SW8) is connected to the 7# pin of the 1K digital potentiometer (U5), and the 1# terminal of the ninth switch (SW9) is connected to the 1K digital potentiometer. The 1# pin of (U5) is connected; the 2# terminal of the first switch (SW1), the 2# terminal of the fifth switch (SW5), and the 2# terminal of the eighth switch (SW8) are connected together, so The 2# terminal of the second switch (SW2), the 2# terminal of the sixth switch (SW6), and the 2# terminal of the ninth switch (SW9) are connected together.
  5. 根据权利要求4所述的一种低电流宽范围可调脉冲恒流源电路，其特征在于，所述的开关切换电路还包括第一选择开关(SW4)、第二选择开关(SW7)；所述的电流源电路包括电流源芯片(U6)、可调低压降稳压器(U7)、电阻R1；所述的第一选择开关(SW4)的2#端子与所述的第一开关(SW1)的2#端子、第五开关(SW5)的2#端子、第八开关(SW8)的2#端子连接在一起，所述的第一选择开关(SW4)的1#端子连接在电流源芯片(U6)的1#引脚，所述的电阻R1的一端与可调低压降稳压器(U7)的2#引脚连接、电阻R1的另一端与第一选择开关(SW4)的3#端子连接；所述的第二选择开关(SW7)的2#端子与所述的第二开关(SW2)的2#端子、第六开关(SW6)的2#端子、第九开关(SW9)的2#端子连接在一起，所述的第二选择开关(SW7)的1#端子连接在电流源芯片(U6)的2#引脚，第二选择开关(SW7)的3#端子连接在可调低压降稳压器(U7)的1#引脚。The low-current wide-range adjustable pulse constant current source circuit according to claim 4, wherein the switch switching circuit further comprises a first selection switch (SW4) and a second selection switch (SW7); The current source circuit includes a current source chip (U6), an adjustable low-dropout voltage regulator (U7), and a resistor R1; the 2# terminal of the first selection switch (SW4) and the first switch ( The 2# terminal of SW1), the 2# terminal of the fifth switch (SW5), and the 2# terminal of the eighth switch (SW8) are connected together, and the 1# terminal of the first selection switch (SW4) is connected to the current source. The 1# pin of the chip (U6), one end of the resistor R1 is connected to the 2# pin of the adjustable low drop voltage regulator (U7), and the other end of the resistor R1 is connected to the first selection switch (SW4). 3# terminal is connected; the 2# terminal of the second selection switch (SW7) is connected to the 2# terminal of the second switch (SW2), the 2# terminal of the sixth switch (SW6), the ninth switch (SW9) ) of 2# terminals are connected together, the 1# terminal of the second selection switch (SW7) is connected to the 2# pin of the current source chip (U6), and the 3# terminal of the second selection switch (SW7) is connected to Pin 1# of the Adjustable Low Dropout Regulator (U7).
  6. 根据权利要求5所述的一种低电流宽范围可调脉冲恒流源电路，其特征在于，所述的电流源电路还包括模拟选择开关(SW3)、MOSFET功率器件(Q1)，电阻R2、功率器件控制信号发生器；电容C2、电容C4；所述的模拟选择开关(SW3)的2#端子与电流源芯片(U6)的1#引脚连接，模拟选择开关(SW3)的1#端子与MOSFET功率器件(Q1)的漏极连接，模拟选择开关(SW3)的3#端子接地，MOSFET功率器件(Q1)的源极接地；所述的电容C2的一端连接在电流源芯片(U6)的3#引脚，另一端接地；所述的电容C4的一端连接在可调低压降稳压器(U7)的3#引脚，另一端接地；所述的电阻R1的一端与可调低压降稳压器(U7)的2#引脚连接，电阻R1的另一端与MOSFET功率器件(Q1)的漏极连接；所述的电阻R2并联在MOSFET功率器件(Q1)的栅极与源极之间，所述的功率器件控制信号发生器并联在电阻R2的两端。A low-current wide-range adjustable pulse constant current source circuit according to claim 5, wherein the current source circuit further comprises an analog selection switch (SW3), a MOSFET power device (Q1), a resistor R2, Power device control signal generator; capacitor C2, capacitor C4; the 2# terminal of the analog selection switch (SW3) is connected to the 1# pin of the current source chip (U6), and the 1# terminal of the analog selection switch (SW3) It is connected to the drain of the MOSFET power device (Q1), the 3# terminal of the analog selection switch (SW3) is grounded, and the source of the MOSFET power device (Q1) is grounded; one end of the capacitor C2 is connected to the current source chip (U6) 3# pin, the other end is grounded; one end of the capacitor C4 is connected to the 3# pin of the adjustable low-dropout regulator (U7), and the other end is grounded; one end of the resistor R1 is connected to the adjustable The 2# pin of the low dropout regulator (U7) is connected, and the other end of the resistor R1 is connected to the drain of the MOSFET power device (Q1); the resistor R2 is connected in parallel with the gate of the MOSFET power device (Q1) and the drain of the MOSFET power device (Q1). Between the sources, the power device control signal generator is connected in parallel with both ends of the resistor R2.
  7. 根据权利要求5所述的一种低电流宽范围可调脉冲恒流源电路，其特征在于，所述的恒流源电路在10uA-1A持续可调恒定电流输出，分5段组合的方式实现：A low-current wide-range adjustable pulse constant current source circuit according to claim 5, characterized in that, the constant current source circuit can continuously adjust the constant current output at 10uA-1A, and is realized by a combination of 5 sections :
    1)10uA-0.06mA持续可调电流输出1) 10uA-0.06mA continuous adjustable current output
    四通道数字信号隔离器(U1)选择100K数字电位器(U3)，并通过公式(1)和(2)设定100K数字电位器(U3)的D值，从而使100K数字电位器(U3)输出需求电流对应的电阻值，通过第一开关(SW1)、第二开关(SW2)、第一选择开关(SW4)、第二选择开关(SW7)选择电流源芯片(U6)输出相应的电流值，计算公式如下：The four-channel digital signal isolator (U1) selects the 100K digital potentiometer (U3), and sets the D value of the 100K digital potentiometer (U3) through formulas (1) and (2), so that the 100K digital potentiometer (U3) Output the resistance value corresponding to the required current, and select the current source chip (U6) to output the corresponding current value through the first switch (SW1), the second switch (SW2), the first selection switch (SW4), and the second selection switch (SW7) ,Calculated as follows:
    Iout＝67.7/RSET(D)  (1)Iout=67.7/RSET(D) (1)
    RSET(D)＝D*100K/1024  (2)RSET(D)=D*100K/1024 (2)
    其中，Iout为输出的电流值，RSET(D)为设置电阻值，67.7为电流源芯片(U6)的额定输出值，D为十进制数值，此时，取值范围为1-69；Among them, Iout is the output current value, RSET(D) is the set resistance value, 67.7 is the rated output value of the current source chip (U6), D is the decimal value, at this time, the value range is 1-69;
    2)0.06mA-1mA持续可调电流输出2) 0.06mA-1mA continuous adjustable current output
    四通道数字信号隔离器(U1)、双通道数字信号隔离器(U2)选择1K数字电位器(U5)并通过公式(1)和(3)设定1K数字电位器(U5)的D值，从而使1K数字电位器(U5)输出需求电流对应的电阻值，通过第八开关(SW8)、第九开关(SW9)、第一选择开关(SW4)、第二选择开关(SW7)选择电流源芯片(U6)输出相应的电流值，计算公式如下：The four-channel digital signal isolator (U1) and the two-channel digital signal isolator (U2) select the 1K digital potentiometer (U5) and set the D value of the 1K digital potentiometer (U5) through formulas (1) and (3). Thus, the 1K digital potentiometer (U5) outputs the resistance value corresponding to the required current, and the current source is selected through the eighth switch (SW8), the ninth switch (SW9), the first selection switch (SW4), and the second selection switch (SW7). The chip (U6) outputs the corresponding current value, and the calculation formula is as follows:
    Iout＝67.7/RSET(D)  (1)Iout=67.7/RSET(D) (1)
    RSET(D)＝D*1K/256  (3)RSET(D)=D*1K/256 (3)
    其中，此时D取值范围为17-256；Among them, the value range of D is 17-256 at this time;
    3)1mA-10mA持续可调电流输出3) 1mA-10mA continuously adjustable current output
    四通道数字信号隔离器(U1)、双通道数字信号隔离器(U2)选择1K数字电位器(U5)并通过公式(3)和(4)设定1K数字电位器(U5)的D值，从而使1K数字电位器(U5)输出需求电流对应的电阻值，通过第八开关(SW8)、第九开关(SW9)、第一选择开关(SW4)、第二选择开关(SW7)选择可调低压降稳压器(U7)输出相应的电流值，计算公式如下：The four-channel digital signal isolator (U1) and the two-channel digital signal isolator (U2) select the 1K digital potentiometer (U5) and set the D value of the 1K digital potentiometer (U5) through formulas (3) and (4). Thus, the 1K digital potentiometer (U5) outputs the resistance value corresponding to the required current, which can be adjusted through the eighth switch (SW8), the ninth switch (SW9), the first selection switch (SW4), and the second selection switch (SW7). The low dropout voltage regulator (U7) outputs the corresponding current value, and the calculation formula is as follows:
    RSET(D)＝D*1K/256  (3)RSET(D)=D*1K/256 (3)
    Iout＝RSET(D)*10  (4)Iout=RSET(D)*10 (4)
    其中，10为可调低压降稳压器(U7)额定输出值，此时D取值范围为26-256；Among them, 10 is the rated output value of the adjustable low-dropout voltage regulator (U7), and the value range of D is 26-256;
    4)10mA-100mA持续可调电流输出4) 10mA-100mA continuous adjustable current output
    四通道数字信号隔离器(U1)、双通道数字信号隔离器(U2)选择10K数字电位器(U4)并通过公式(4)和(5)设定10K数字电位器(U4)的D值，从而使10K数字电位器(U4)输出需求电流对应的电阻值，通过第五开关(SW5)、第六开关(SW6)、第一选择开关(SW4)、第二选择开关(SW7)选择可调低压降稳压器(U7)输出相应的电流值，计算公式如下：The four-channel digital signal isolator (U1) and the two-channel digital signal isolator (U2) select the 10K digital potentiometer (U4) and set the D value of the 10K digital potentiometer (U4) through formulas (4) and (5). Thus, the 10K digital potentiometer (U4) outputs the resistance value corresponding to the required current, which can be adjusted through the fifth switch (SW5), the sixth switch (SW6), the first selection switch (SW4), and the second selection switch (SW7). The low dropout voltage regulator (U7) outputs the corresponding current value, and the calculation formula is as follows:
    Iout＝RSET(D)*10  (4)Iout=RSET(D)*10 (4)
    RSET(D)＝D*10K/1024  (5)RSET(D)=D*10K/1024 (5)
    其中，此时D的取值范围为102-1024；Among them, the value range of D at this time is 102-1024;
    5)100mA-1A持续可调电流输出5) 100mA-1A continuous adjustable current output
    四通道数字信号隔离器(U1)选择100K数字电位器(U3)并通过公式(2)和(4)设定100K数字电位器(U3)的D值，从而使100K数字电位器(U3)输出需求电流对应的电阻值，通过第一开关(SW1)、第二开关(SW2)、第一选择开关(SW4)、第二选择开关(SW7)选择可调低压降稳压器(U7)输出相应的电流值，计算公式如下：The four-channel digital signal isolator (U1) selects the 100K digital potentiometer (U3) and sets the D value of the 100K digital potentiometer (U3) through formulas (2) and (4), so that the 100K digital potentiometer (U3) outputs The resistance value corresponding to the demand current is selected through the first switch (SW1), the second switch (SW2), the first selection switch (SW4), and the second selection switch (SW7) to select the output of the adjustable low-dropout regulator (U7) The corresponding current value, the calculation formula is as follows:
    RSET(D)＝D*100K/1024  (2)RSET(D)=D*100K/1024 (2)
    Iout＝RSET(D)*10  (4)Iout=RSET(D)*10 (4)
    其中，D取值范围为103-1024。Among them, the value range of D is 103-1024.
  8. 根据权利要求2所述的一种低电流宽范围可调脉冲恒流源电路，其特征在于，所述四通道数字信号隔离器(U1)型号为ADUM141E，所述双通道数字信号隔离器(U2)型号为ADUM1200。The low-current wide-range adjustable pulse constant current source circuit according to claim 2, wherein the model of the four-channel digital signal isolator (U1) is ADUM141E, and the two-channel digital signal isolator (U2 ) model is ADUM1200.
  9. 根据权利要求2所述的一种低电流宽范围可调脉冲恒流源电路，其 特征在于，所述100K数字电位器(U3)型号为AD5293，所述10K数字电位器(U4)型号为AD5174，所述1K数字电位器(U5)型号为AD8400。A low-current wide-range adjustable pulse constant current source circuit according to claim 2, wherein the model of the 100K digital potentiometer (U3) is AD5293, and the model of the 10K digital potentiometer (U4) is AD5174 , the 1K digital potentiometer (U5) model is AD8400.
  10. 根据权利要求6所述的一种低电流宽范围可调脉冲恒流源电路，其特征在于，所述电流源芯片(U6)型号为LM334；所述可调低压降稳压器(U7)型号为LT3080；所述的模拟选择开关(SW3)型号为ADG5419；所述MOSFET功率器件(Q1)的型号为FQP50N06。The low-current wide-range adjustable pulse constant current source circuit according to claim 6, wherein the current source chip (U6) is a model of LM334; the adjustable low-dropout voltage regulator (U7) The model is LT3080; the model of the analog selection switch (SW3) is ADG5419; the model of the MOSFET power device (Q1) is FQP50N06.
PCT/CN2020/134879 2020-10-27 2020-12-09 Low-current wide-range adjustable pulse constant current source circuit WO2022088403A1 (en)

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