Four-quadrant power supply circuit based on ATE and four-quadrant power supply

Abstract

The application provides a four-quadrant power supply circuit and a four-quadrant power supply based on ATE, which comprises a digital-to-analog converter, a feedback compensation module, an output adjustment module and a load output end, and the digital-to-analog converter is provided with multiple output channels; the feedback compensation module comprises a first operational amplifier, a first non-inverting terminal of the first operational amplifier is connected with a second output channel, and a first inverting terminal of the first operational amplifier is connected with a first output terminal of the first operational amplifier; the output adjustment module comprises a second operational amplifier, a current control terminal of the second operational amplifier is connected with a first output channel, a second output terminal of the second operational amplifier is connected with a second inverting terminal of the second operational amplifier, and a second non-inverting terminal of the second operational amplifier is connected with the first output terminal; and the load output end is connected with the second output terminal to provide power supply for a load. The application can adjust an output voltage, realize real-time compensation function and improve the accuracy of power supply.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electronic circuit, in particular to a four-quadrant power supply circuit and four-quadrant power supply based on ATE. BACKGROUND

[0002] When the automatic test machine (ATE) of integrated circuit tests the function of the chip to be tested, the chip needs to be powered first. This power supply requirement is stable and adjustable. In the industry, a programmable device power supply (DPS) chip is mostly used. Most existing solutions use independent power supply chips to power the chip to be tested. However, the voltage of the independent power supply chip cannot be adjusted in real time, and can only be used for special purposes. Moreover, the voltage accuracy is limited by the precision of the voltage dividing resistor, and the accuracy is not high. SUMMARY

[0003] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application provides a four-quadrant power supply circuit and four-quadrant power supply based on ATE, which can adjust the output voltage, realize real-time compensation function, and improve the accuracy of power supply.

[0004] The first aspect of the present application provides a four-quadrant power supply circuit based on ATE, comprising a digital-to-analog converter, a feedback compensation module, an output adjustment module and a load output end. The digital-to-analog converter is used to receive and convert input signals to output corresponding control signals. The digital-to-analog converter includes a first output channel for outputting a current control signal and a second output channel for outputting a voltage control signal. The feedback compensation module includes a first operational amplifier. The first non-inverting terminal of the first operational amplifier is connected with the second output channel, and the first inverting terminal of the first operational amplifier is connected with the first output terminal of the first operational amplifier. The output adjustment module includes a second operational amplifier. The current control terminal of the second operational amplifier is connected with the first output channel, the second output terminal of the second operational amplifier is connected with the second inverting terminal of the second operational amplifier, and the second non-inverting terminal of the second operational amplifier is connected with the first output terminal. The load output end is connected with the second output terminal to provide power supply to the load.

[0005] The ATE-based four-quadrant power supply circuit provided by the embodiment of the present application has at least the following beneficial effects: the digital-to-analog converter, the feedback compensation module, the output adjustment module and the load output end are arranged, the first operational amplifier of the feedback compensation module is connected with the second output channel at the first non-inverting input terminal, the first non-inverting input terminal of the first operational amplifier is connected with the first output terminal of the first operational amplifier, the output adjustment module comprises a second operational amplifier, the current control terminal of the second operational amplifier is connected with the first output channel, the second output terminal of the second operational amplifier is connected with the second non-inverting input terminal of the second operational amplifier, and the second non-inverting input terminal of the second operational amplifier is connected with the first output terminal. Since the current control terminal of the second operational amplifier is arranged and connected with the first output channel, the second operational amplifier can control the output current according to the current control signal of the first output channel; meanwhile, since the first non-inverting input terminal of the first operational amplifier is connected with the second output channel and the second non-inverting input terminal of the second operational amplifier is connected with the first output terminal, the first operational amplifier can control the output voltage according to the voltage control signal output by the second output channel and output the corresponding voltage to the second operational amplifier, since the second output terminal of the second operational amplifier is connected with the load output end, the second operational amplifier can output stable voltage to the load output end and supply power to the load. Moreover, the first output terminal of the first operational amplifier is connected with the first non-inverting input terminal of the first operational amplifier, and the second output terminal of the second operational amplifier is connected with the second non-inverting input terminal of the second operational amplifier, so that the negative feedback configuration is formed, thereby ensuring the stable operation of the circuit. In addition, the current control terminal of the second operational amplifier can control the output current, thereby adjusting the output voltage and realizing the real-time compensation function, which can avoid the voltage drop caused by the large current in the circuit and improve the accuracy of power supply.

[0006] According to some embodiments of the present application, the power supply detection module is arranged with a sampling resistor and an analog-to-digital converter, and the second output terminal is connected with the analog-to-digital converter, the first non-inverting input terminal and the load output end through the sampling resistor.

[0007] According to some embodiments of the present application, the power supply detection module comprises a current sampling operational amplifier, the current sampling non-inverting input terminal of the current sampling operational amplifier is connected with the connection point of the second output terminal and the sampling resistor, the current sampling non-inverting input terminal of the current sampling operational amplifier is connected with the connection point of the sampling resistor and the load output end, and the current sampling output terminal of the current sampling operational amplifier is connected with the analog-to-digital converter.

[0008] According to some embodiments of the present application, the power detection module comprises a plurality of sampling resistors with different resistance values and a plurality of current sampling operational amplifiers corresponding to the sampling resistors one by one, each of the sampling resistors is connected in series with each other, both ends of all the sampling resistors are connected to the current sampling input terminals of the corresponding current sampling operational amplifiers respectively, and the current sampling output terminals of all the current sampling operational amplifiers are connected to the analog-to-digital converter, wherein (N-1) of the sampling resistors are connected with short-circuit switches at both ends, and N represents the total number of all the sampling resistors.

[0009] According to some embodiments of the present application, the power detection module further comprises a voltage sampling operational amplifier, a voltage sampling non-inverting terminal of the voltage sampling operational amplifier is connected to the sampling resistor, a voltage sampling inverting terminal of the voltage sampling operational amplifier is connected to a voltage sampling output terminal of the voltage sampling operational amplifier, and the voltage sampling output terminal is connected to the analog-to-digital converter.

[0010] According to some embodiments of the present application, the feedback compensation module comprises a feedback operational amplifier module, the feedback operational amplifier module is provided with a third operational amplifier, a third non-inverting terminal of the third operational amplifier is connected to the second output terminal, a third inverting terminal of the third operational amplifier is connected to a third output terminal of the third operational amplifier, and the third output terminal is connected to the first inverting terminal.

[0011] According to some embodiments of the present application, the feedback compensation module is provided with a first capacitor, a first resistor, a second resistor, a third resistor, a fourth resistor and a fifth resistor, one end of the first capacitor is connected to the first inverting terminal, the other end of the first capacitor is connected to the first output terminal, the first inverting terminal is grounded through the first resistor, one end of the second resistor is connected to the first inverting terminal, the other end of the second resistor is connected to the third output terminal, the third inverting terminal is grounded through the third resistor, the first output terminal is connected to the fifth resistor through the fourth resistor, the fifth resistor is connected to the load output terminal, and the third non-inverting terminal is connected to the connection point of the fourth resistor and the fifth resistor.

[0012] According to some embodiments of the present application, an integral operational module for preventing overshoot is arranged between the second output channel and the first non-inverting terminal, the integral operational module comprises a fourth operational amplifier, a fourth non-inverting terminal of the fourth operational amplifier is grounded, a fourth inverting terminal of the fourth operational amplifier is connected to the second output channel, and a fourth output terminal of the fourth operational amplifier is connected to the first non-inverting terminal.

[0013] According to some embodiments of the present application, the integral operation module is further provided with a second capacitor, a sixth resistor, a seventh resistor and an eighth resistor, the fourth non-inverting terminal is connected with the second output channel through the sixth resistor, the fourth inverting terminal is grounded through the seventh resistor, the fourth output terminal is connected with the fourth non-inverting terminal through the second capacitor, and the eighth resistor is connected with the second capacitor in parallel.

[0014] The second aspect of the present application provides a four-quadrant power supply, which comprises the four-quadrant power supply circuit based on ATE as described in the first aspect of the present application.

[0015] The four-quadrant power supply provided by the embodiments of the present application has at least the following beneficial effects: by arranging a digital-to-analog converter, a feedback compensation module, an output adjustment module and a load output terminal, the feedback compensation module is provided with a first operational amplifier, the first inverting terminal of the first operational amplifier is connected with the second output channel, the first non-inverting terminal of the first operational amplifier is connected with the first output terminal of the first operational amplifier, the output adjustment module comprises a second operational amplifier, the current control terminal of the second operational amplifier is connected with the first output channel, the second output terminal of the second operational amplifier is connected with the second non-inverting terminal of the second operational amplifier, and the second inverting terminal of the second operational amplifier is connected with the first output terminal. Since the second operational amplifier is provided with the current control terminal and the current control terminal of the second operational amplifier is connected with the first output channel, the second operational amplifier can limit the size of the output current according to the current control signal of the first output channel. At the same time, since the first inverting terminal of the first operational amplifier is connected with the second output channel and the second inverting terminal of the second operational amplifier is connected with the first output terminal, the first operational amplifier can control the size of the output voltage according to the voltage control signal output by the second output channel and output the corresponding voltage to the second operational amplifier. Since the second output terminal of the second operational amplifier is connected with the load output terminal, the second operational amplifier can output stable voltage to the load output terminal and be used for supplying power to the load. Moreover, the first output terminal of the first operational amplifier is connected with the first non-inverting terminal of the first operational amplifier, and the second output terminal of the second operational amplifier is connected with the second non-inverting terminal of the second operational amplifier, so that the configuration of negative feedback is formed, thereby ensuring the stable operation of the circuit. In addition, the size of the current output can be limited through the current control terminal of the second operational amplifier, thereby adjusting the size of the output voltage and realizing the real-time compensation function, which can avoid the voltage drop caused by the large current in the circuit, thereby improving the accuracy of power supply. Therefore, the present application can adjust the output voltage, realize the real-time compensation function and improve the accuracy of power supply. BRIEF DESCRIPTION OF DRAWINGS

[0016] Additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments with reference to the following drawings, in which:

[0017] Figure 1 is a schematic diagram of a circuit structure of an embodiment of the present application;

[0018] Figure 2 is a schematic diagram of a circuit of an embodiment of the present application;

[0019] Figure 3 is a schematic diagram of a feedback compensation module of an embodiment of the present application;

[0020] Figure 4 is a schematic diagram of a feedback compensation module of an embodiment of the present application;

[0021] Figure 5 is a schematic diagram of an integral operation module of an embodiment of the present application;

[0022] Figure 6 is a schematic diagram of an integral operation module of an embodiment of the present application;

[0023] Figure 7 is a schematic diagram of an integral operation module of an embodiment of the present application;

[0024] Figure 8 is a schematic diagram of an integral operation module of an embodiment of the present application; DETAILED DESCRIPTION

[0025] Embodiments of the present application are described in detail below with reference to the attached drawings. The embodiments described below are examples of the present application and are not intended to limit the present application. The same or similar components are denoted by the same or similar reference numerals throughout the drawings.

[0026] In the description of the present application, it should be understood that the orientation description, such as up, down, front, back, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or component must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0027] In the description of the present application, the meaning of several is one or more, the meaning of multiple is two or more, greater than, less than, more than, etc. are understood as not including the number, above, below, etc. are understood as including the number. If the first, second, etc. are described, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the order of indicated technical features.

[0028] In the description of the present application, unless otherwise explicitly defined, the words such as setting, installing, connecting and the like should be understood in a broad sense, and the person skilled in the art can determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0029] As shown in Figure 1 and Figure 2 , the first aspect embodiment of the present application provides a four-quadrant power supply circuit based on ATE, which comprises a digital-to-analog converter DAC, a feedback compensation module, an output adjustment module and a load output end. The digital-to-analog converter DAC is used to receive and convert input signals to output corresponding control signals. The first output channel CH1 of the digital-to-analog converter DAC receives a digital input signal for adjusting current, and can output a current control signal after conversion. The second output channel CH2 of the digital-to-analog converter DAC receives a digital input signal for adjusting voltage, and can output a voltage control signal after conversion. That is, the digital-to-analog converter DAC comprises a first output channel CH1 for outputting a current control signal and a second output channel CH2 for outputting a voltage control signal. The feedback compensation module comprises a first operational amplifier U1, the first non-inverting terminal of the first operational amplifier U1 is connected with the second output channel CH2, and the first inverting terminal of the first operational amplifier U1 is connected with the first output terminal of the first operational amplifier U1. The output adjustment module comprises a second operational amplifier U2, the current control terminal of the second operational amplifier U2 is connected with the first output channel CH1, the second output terminal of the second operational amplifier U2 is connected with the second inverting terminal of the second operational amplifier U2, and the second non-inverting terminal of the second operational amplifier U2 is connected with the first output terminal. The load output end is connected with the second output terminal, and is used to provide power supply to the load.

[0030] It can be understood that the present application can adjust the output voltage, realize the real-time compensation function, and improve the accuracy of power supply by setting the digital-to-analog converter (DAC), the feedback compensation module, the output adjustment module and the load output end. The feedback compensation module is provided with the first operational amplifier U1, the first non-inverting terminal of the first operational amplifier U1 is connected with the second output channel CH2, the first inverting terminal of the first operational amplifier U1 is connected with the first output terminal of the first operational amplifier U1, the output adjustment module comprises the second operational amplifier U2, the current control terminal of the second operational amplifier U2 is connected with the first output channel CH1, the second output terminal of the second operational amplifier U2 is connected with the second inverting terminal of the second operational amplifier U2, and the second non-inverting terminal of the second operational amplifier U2 is connected with the first output terminal. Since the second operational amplifier U2 is provided with the current control terminal and the current control terminal of the second operational amplifier U2 is connected with the first output channel CH1, the second operational amplifier U2 can limit the size of the output current according to the current control signal of the first output channel CH1. At the same time, since the first non-inverting terminal of the first operational amplifier U1 is connected with the second output channel CH2 and the second non-inverting terminal of the second operational amplifier U2 is connected with the first output terminal, the first operational amplifier U1 can control the size of the output voltage according to the voltage control signal output by the second output channel CH2 and output the corresponding voltage to the second operational amplifier U2. Since the second output terminal of the second operational amplifier U2 is connected with the load output end, the second operational amplifier U2 can output stable voltage to the load output end and be used for supplying power to the load. Moreover, the first output terminal of the first operational amplifier U1 is connected with the first inverting terminal of the first operational amplifier U1, and the second output terminal of the second operational amplifier U2 is connected with the second inverting terminal of the second operational amplifier U2, so that the negative feedback configuration can be formed, thereby ensuring the stable operation of the circuit. In addition, the size of the current output can be limited through the current control terminal of the second operational amplifier U2, so as to adjust the output voltage, realize the real-time compensation function, avoid the voltage drop caused by the large current on the circuit, and improve the accuracy of power supply. Therefore, the present application can adjust the output voltage, realize the real-time compensation function, and improve the accuracy of power supply.

[0031] It should be noted that the digital-to-analog converter DAC of the present application is provided with a plurality of channels, which are respectively a first output channel CH1 for outputting a current control signal and a second output channel CH2 for outputting a voltage control signal. The present application is provided with three different product models of operational amplifiers, which are respectively an operational amplifier A1, an operational amplifier A2 and an operational amplifier A3; wherein the operational amplifier A1 is a large current operational amplifier with overheat and overload protection, which has a current control end, i.e. an ILIM pin, the ILIM pin being a selectable current limiting pin, and the size of the output current can be limited by limiting the voltage or current of this pin, so in this embodiment the size of the output current can be controlled by a resistor or a digital-to-analog converter DAC, specifically the product model of the operational amplifier A1 can be OPA541; the operational amplifier A2 is an operational amplifier supporting a power supply voltage of 60V, specifically the product model of the operational amplifier A1 can be OPA551; and the operational amplifier A3 is a current detection amplifier, which can measure the voltage drop on the current sampling resistor and output a voltage proportional to the measured current, specifically the product model of the operational amplifier A3 can be INA240.

[0032] It can be understood that the first output channel CH1 of the digital-to-analog converter DAC of the present application is connected with the current control end ILIM pin of the second operational amplifier U2, and the current control signal can be output to the second operational amplifier U2 to limit the size of the current output; and the second output channel CH2 of the digital-to-analog converter DAC is connected with the second non-inverting terminal of the first operational amplifier U1 and the second operational amplifier U2, and the voltage control signal of the second output channel CH2 can be output to the voltage load end to provide power supply to the load; since the first operational amplifier U1 and the second operational amplifier U2 can support high voltage and large current output, the circuit can also meet the output demand of high voltage and large current. The first operational amplifier U1 is provided as a component of the feedback compensation module, the first inverting terminal of the first operational amplifier U1 is connected with the first output terminal, and the voltage drop caused by the line impedance can be compensated by the feedback compensation module to realize real-time compensation function; the ILIM pin of the second operational amplifier U2 is provided to limit the size of the voltage or current, and the voltage or current can be adjusted according to the actual situation to realize continuous adjustment of the output voltage and improve the accuracy of power supply.

[0033] As shown in Figure 1 and Figure 2 According to some embodiments of the present application, a power supply detection module is further included, which is provided with a sampling resistor and an analog-to-digital converter ADC, and the second output terminal is connected with the analog-to-digital converter ADC, the first inverting terminal and the load output terminal through the sampling resistor.

[0034] It can be understood that the power detection module can realize the measurement of the current and the voltage, the sampling resistor of the power detection module can sample the current or the voltage output by the circuit and transmit to the analog-to-digital converter ADC for signal conversion, so as to realize the measurement of the current or the voltage.

[0035] As shown in Figure 1 and Figure 2 According to some embodiments of the present application, the power detection module comprises a current sampling operational amplifier, the current sampling non-inverting terminal of the current sampling operational amplifier is connected to the connection point of the second output end and the sampling resistor, the current sampling inverting terminal of the current sampling operational amplifier is connected to the connection point of the sampling resistor and the load output end, and the current sampling output terminal of the current sampling operational amplifier is connected to the analog-to-digital converter ADC.

[0036] It should be noted that the current sampling operational amplifier of the present application can be provided with multiple or one, which can measure the voltage drop on the current sampling resistor and output a voltage proportional to the measured current. The current sampling operational amplifier detects the voltage across the sampling resistor and amplifies it to a certain multiple, and then inputs it to the analog-to-digital converter ADC to measure the voltage. According to the voltage value and the resistance value, the current value can be converted, so as to realize the measurement of the current value.

[0037] It can be understood that in one embodiment of the present application, the current sampling operational amplifier is provided with one, which is the current sampling operational amplifier U5, the current sampling non-inverting terminal of the current sampling operational amplifier U5 is connected to the connection point of the second output end and the sampling resistor, the current sampling inverting terminal of the current sampling operational amplifier U5 is connected to the connection point of the sampling resistor and the load output end, and the current sampling output terminal of the current sampling operational amplifier U5 is connected to the analog-to-digital converter ADC. In the case that the second output channel CH2 of the digital-to-analog converter DAC outputs a voltage and the first output channel CH1 acts as a current clamping, the current sampling operational amplifier U5 can measure the current of the circuit through the sampling resistor.

[0038] As shown in Figure 1 and Figure 2 According to some embodiments of the present application, the power detection module comprises multiple sampling resistors with different resistances and multiple current sampling operational amplifiers corresponding to the sampling resistors one by one, each sampling resistor is connected in series with each other, both ends of all the sampling resistors are connected to the current sampling input terminals of the corresponding current sampling operational amplifiers, and the current sampling output terminals of all the current sampling operational amplifiers are connected to the analog-to-digital converter ADC, wherein (N-1) sampling resistors are respectively connected with short-circuit switches, and N represents the total number of all the sampling resistors.

[0039] It can be understood that the power detection module of the present application can be provided with a plurality of sampling resistors with different resistance values, specifically, the present application is provided with three sampling resistors, which are the first sampling resistor R8, the second sampling resistor R9 and the third sampling resistor R10. The present application is also provided with a plurality of current sampling operational amplifiers corresponding to the sampling resistors one by one, which are the fifth operational amplifier U5, the sixth operational amplifier U6 and the seventh operational amplifier U7. Among them, each sampling resistor is connected in series with each other, that is, the first sampling resistor R8, the second sampling resistor R9 and the third sampling resistor R10 are connected in series with each other; and the two ends of all the sampling resistors are respectively connected with the current sampling input ends of the corresponding current sampling operational amplifiers, that is, one end of the first sampling resistor R8 is connected with the fifth non-inverting terminal of the fifth operational amplifier U5, the other end of the first sampling resistor R8 is connected with the fifth inverting terminal of the fifth operational amplifier U5, one end of the second sampling resistor R9 is connected with the sixth non-inverting terminal of the sixth operational amplifier U6, the other end of the second sampling resistor R9 is connected with the sixth inverting terminal of the sixth operational amplifier U6, one end of the third sampling resistor R10 is connected with the seventh non-inverting terminal of the seventh operational amplifier U7, and the other end of the third sampling resistor R10 is connected with the seventh inverting terminal of the seventh operational amplifier U7.

[0040] It should be noted that the analog-to-digital converter ADC can be provided with a plurality of input channels, for example, the analog-to-digital converter ADC of the present embodiment is provided with four input channels, which are the first input channel CH1, the second input channel CH2, the third input channel CH3 and the fourth input channel CH4; the current sampling output ends of each current sampling operational amplifier are connected with the analog-to-digital converter ADC, specifically, the fifth output end of the fifth operational amplifier U5 is connected with the first input channel CH1, the sixth output end of the sixth operational amplifier U6 is connected with the second input channel CH2, and the seventh output end of the seventh operational amplifier U7 is connected with the third input channel CH3; the current values passing through the first operational amplifier U1 and the second operational amplifier U2 are measured by means of the current sampling operational amplifiers U5, U6 and U7, and are input to the analog-to-digital converter ADC for digital signal conversion, which can realize the measurement of the current value of the circuit.

[0041] It can be understood that the power detection module is also provided with short-circuit switches, wherein the two ends of (N-1) sampling resistors are respectively connected with short-circuit switches, N represents the total number of all sampling resistors, and the switching of the current gear can be realized by the closing of the short-circuit switches to realize the measurement of different gear currents.

[0042] It can be understood that in one embodiment of the present application, the number of sampling resistors is set to three, namely the first sampling resistor R8, the second sampling resistor R9 and the third sampling resistor R10, and the number of short-circuit switches is set to two, namely the first switch S1 and the second switch S2, wherein one end of the first switch S1 is connected to the connection point of the second output end and the first sampling resistor R8, the other end of the first switch S1 is connected to the connection point of the first sampling resistor R8 and the second sampling resistor R9, one end of the second switch S2 is connected to the connection point of the second output end and the first sampling resistor R8, and the other end of the second switch S2 is connected to the connection point of the second sampling resistor R9 and the third sampling resistor R10.

[0043] It should be noted that the short-circuit switch can realize the measurement of different current levels, and the sampling resistors with different resistance values can improve the accuracy of current measurement. In one embodiment of the present application, the resistance values of the sampling resistors are all different, specifically, the resistance values of the sampling resistors R8, R9 and R10 are in a multiple relationship, the first sampling resistor R8 is 5 ohms, the second sampling resistor R9 is 0.5 ohms, and the third sampling resistor R10 is 0.05 ohms. During the current measurement of the circuit, different current levels can be measured by closing different short-circuit switches: for example, when the first switch S1 is closed, the first sampling resistor R8 is short-circuited, and the circuit can use the second sampling resistor R9 or the third sampling resistor R10 to detect current, because the resistance values of the second sampling resistor R9 and the third sampling resistor R10 are small, 0.5 ohms and 0.05 ohms respectively, and the voltage of the second output channel CH2 is fixed, so the measurement of large current level can be realized; for another example, when the second switch S2 is closed, the first sampling resistor R8 and the second sampling resistor R9 are short-circuited, and the circuit uses the third resistor R10 to detect current, because the resistance value of the third resistor R10 is the smallest, 0.05 ohms, and the voltage of the second output channel CH2 is fixed, so the measurement of larger current level can be realized, for example, the measurement of 1A current; and when neither the first switch S1 nor the second switch S2 is closed, the circuit uses the first sampling resistor R8 to detect current, because the resistance value of the first sampling resistor R8 is the largest, 5 ohms, and the voltage of the second output channel CH2 is fixed, so the measurement of small current level can be realized, for example, the measurement of 10mA current.

[0044] Specifically, in the case of measuring 1A current, the second switch S2 needs to be closed to short-circuit the first sampling resistor R8 and the second sampling resistor R9, and the circuit detects current through the third sampling resistor R10 (0.05 ohms), which can realize the measurement of large current level and avoid the case that large current passes through large resistance, resulting in excessive power on the large resistance.

[0045] As Figure 1 and Figure 2As shown, according to some embodiments of the present application, the power detection module further comprises a voltage sampling operational amplifier U8, a voltage sampling non-inverting terminal of the voltage sampling operational amplifier U8 is connected with a sampling resistor, a voltage sampling inverting terminal of the voltage sampling operational amplifier U8 is connected with a voltage sampling output terminal of the voltage sampling operational amplifier U8, and the voltage sampling output terminal is connected with an analog-to-digital converter ADC.

[0046] It can be understood that the power detection module is further provided with the voltage sampling operational amplifier U8, the voltage sampling non-inverting terminal of the voltage sampling operational amplifier U8 is connected with the sampling resistor, the voltage sampling inverting terminal of the voltage sampling operational amplifier U8 is connected with the voltage sampling output terminal of the voltage operational amplifier, voltage reduction operation can be performed through the voltage sampling operational amplifier U8, and the voltage sampling output terminal inputs voltage to the analog-to-digital converter ADC to perform digital signal conversion, so as to realize measurement of the voltage value of the circuit.

[0047] As shown in Figure 1 and Figure 2 As shown, according to some embodiments of the present application, the feedback compensation module comprises a feedback operational amplifier module, the feedback operational amplifier module is provided with a third operational amplifier U3, a third non-inverting terminal of the third operational amplifier U3 is connected with a second output terminal, a third inverting terminal of the third operational amplifier U3 is connected with a third output terminal of the third operational amplifier U3, and the third output terminal is connected with a first inverting terminal.

[0048] As shown in Figure 3 As shown, according to some embodiments of the present application, the feedback compensation module is provided with a first capacitor C1, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4 and a fifth resistor R5, one end of the first capacitor C1 is connected with the first inverting terminal, the other end of the first capacitor C1 is connected with a first output terminal, the first inverting terminal is grounded through the first resistor R1, one end of the second resistor R2 is connected with the first inverting terminal, the other end of the second resistor R2 is connected with a third output terminal, the third inverting terminal is grounded through the third resistor R3, the first output terminal CH1 is connected with the fifth resistor R5 through the fourth resistor R4, the fifth resistor R5 is connected with a load output terminal, and the third non-inverting terminal is connected to a connection point of the fourth resistor R4 and the fifth resistor R5.

[0049] It can be understood that the ATE device in the related art adopts the scheme of supplying power to the measured chip by using the DPS chip, the output power of the single chip of the DPS chip is limited, high-voltage output cannot be realized, the output voltage cannot be adjusted in real time, the output precision is also affected by the resistor, and the universality of the ATE device is seriously affected. The feedback compensation module of the present application can be used to compensate voltage drop caused by line impedance of the ATE device, current detection resistor, connection line impedance of the ATE device and the DUT board, and also compensate deviation of the output of the next operational amplifier.

[0050] As Figure 4 shown, Figure 4 is a circuit schematic diagram of a non-feedback compensation module in the related art, specifically, in the case of the circuit as an output voltage measurement current circuit, if the impedance of the line is the fourth resistance R4, the upper output is 2V, the second stage amplification five times output is 10V, but due to the existence of line impedance, the actual voltage output to the DUT board will be pulled down, and the greater the current, the more obvious, at this time, analysis:

[0051] According to the virtual short Un=Up=2V

[0052] According to the virtual break (U2OUT*(R4+R5) / R5-Un) / R2=Un / R1

[0053] (U2OUT*(R4+R5) / R5-Un) / 30K=Un / 7.5K

[0054] U2OUT=5Un*R5 / (R4+R5)=5Up*R5 / (R4+R5)=9.804V

[0055] Wherein, Up is the voltage of the non-inverting terminal, Un is the voltage of the inverting terminal, and U2OUT is the voltage of the second output terminal, the resistance of the first resistor is 7.5K, and the resistance of the second resistor is 30K.

[0056] However, in actual use, the impedance of the fourth resistance R4 is affected by the line impedance of the tester itself, the impedance of the cable, the impedance of the DUT board, and the impedance of the test seat, which cannot be calculated in practice, and is also affected by various aging, so the voltage drop is not easy to compensate by other means.

[0057] As Figure 3 shown, in this embodiment, a feedback compensation module is added to compensate for the voltage drop caused by the line impedance of the ATE device, the current sensing resistor, the impedance of the connection line between the ATE device and the DUT board, and the deviation of the output of the next stage of operational amplifier, and the voltage drop is fed back as a feedback compensation by the third operational amplifier U3, at this time, analysis:

[0058] According to the virtual short Un=Up=2V

[0059] According to the virtual break (U2OUT-Un) / R2=Un / R1

[0060] (U2OUT-Un) / 30K=Un / 7.5K

[0061] U2OUT=5Un=5Up

[0062] Wherein, Up is the voltage of the non-inverting terminal, Un is the voltage of the inverting terminal, and U2OUT is the voltage of the second output terminal, the resistance of the first resistor is 7.5K, and the resistance of the second resistor is 30K.

[0063] At this time, the output is compensated back by the third operational amplifier U3, the voltage drop caused by the large current on the line impedance can be avoided, and the real-time compensation function is realized. Since the line in the middle is long, the first capacitor C1 is added in the embodiment, which can be used as high-frequency negative feedback, thereby avoiding the open-loop phenomenon of the operational amplifier.

[0064] As shown in Figure 1 and Figure 2 According to some embodiments of the present application, an integral operation module for preventing overshoot is arranged between the second output channel CH2 and the first non-inverting terminal, the integral operation module comprises a fourth operational amplifier U4, the fourth non-inverting terminal of the fourth operational amplifier U4 is connected to the ground, the fourth inverting terminal of the fourth operational amplifier U4 is connected to the second output channel CH2, and the fourth output terminal of the fourth operational amplifier U4 is connected to the first non-inverting terminal.

[0065] As shown in Figure 5 According to some embodiments of the present application, the integral operation module further comprises a second capacitor C2, a sixth resistor R6, a seventh resistor R7 and an eighth resistor R8, the fourth inverting terminal is connected to the second output channel CH2 through the sixth resistor R6, the fourth non-inverting terminal is connected to the ground through the seventh resistor R7, the fourth output terminal is connected to the fourth inverting terminal through the second capacitor C2, and the eighth resistor R8 is connected to the second capacitor C2 in parallel.

[0066] It can be understood that, in the case that the circuit is an output voltage measurement current circuit, the integral operation module can be arranged to realize the ramp up and down, and avoid the overshoot of the later stage. Specifically, the second output channel CH2 of the digital-to-analog converter DAC is used to output the voltage of the front stage, and the settable level is provided for the circuit of the later stage. The fourth operational amplifier U4 is a specific component of the integral operation module. In the case that the level of the output of the digital-to-analog converter DAC rises, the second capacitor C2 can perform the charging operation until the second capacitor C2 is fully charged, and the level can be maintained as the level of the output of the digital-to-analog converter DAC, that is, the effect is slow charging rising.

[0067] As shown in Figure 6 , Figure 6 is a boost simulation effect diagram of the integral operation module of one embodiment of the present application. When the voltage of the second output channel CH2 of the digital-to-analog converter DAC rises from 0V to -2V, the output waveform U1-OUT of the integral circuit slowly charges from 0V to 2V, and the later stage slowly powers on to avoid the large overshoot when the later stage has a large capacitor and a large load.

[0068] As shown in Figure 7 , Figure 7The diagram shows the voltage reduction simulation effect of the integral operation module according to an embodiment of the present invention. When the level of the digital-to-analog converter (DAC) decreases, the voltage of the second output channel CH2 of the DAC decreases from -2V to 0V. The second capacitor C2 can be slowly discharged through R2 until it decreases to 0V.

[0069] like Figure 2 As shown, in another embodiment of the present invention, the four-quadrant power supply circuit based on ATE includes a digital-to-analog converter (DAC), an analog-to-digital converter (ADC), an integration module, a feedback compensation module, an adjustment output module, a load output terminal, and a power detection module; wherein, both the DAC and ADC have multiple channels; the integration module includes a fourth operational amplifier U4, a first integrating resistor R1 (the sixth resistor of the integration module), a second integrating resistor R2 (the seventh resistor of the integration module), and an integrating capacitor C1 (the second capacitor of the integration module); the feedback compensation module includes a first operational amplifier U1, a second integrating resistor R2 (the seventh resistor of the integration module), and an integrating capacitor C1 (the second capacitor of the integration module); The system includes three operational amplifiers: U3, C2 (the first capacitor of the aforementioned feedback compensation module), R3, R4 (the first resistor of the aforementioned feedback compensation module), and R5 (the second resistor of the aforementioned feedback compensation module); the output adjustment module is equipped with a second operational amplifier U2, which has a current control terminal, i.e., the ILIM pin; the power supply detection module is equipped with multiple current sampling operational amplifiers, namely the fifth operational amplifier U5, the sixth operational amplifier U6, and the seventh operational amplifier U7, as well as a voltage sampling operational amplifier U8; the load output terminal is connected to a load resistor RDUT.

[0070] like Figure 1 As shown, it can be understood that the first output channel CH1 of the digital-to-analog converter (DAC) is connected to the output adjustment module, the second output channel CH2 of the DAC is connected to the integration module, the integration module is connected to the feedback compensation module, the feedback compensation module is connected to the output adjustment module, the output adjustment module is connected to the power supply detection module, the feedback compensation module and the load output terminal through sampling resistors, and the power supply detection module is connected to the analog-to-digital converter (ADC).

[0071] like Figure 2As shown, specifically, the first output channel CH1 of the digital-to-analog converter DAC is used for outputting the current control signal, the first output channel CH1 is connected with the current control end ILIM pin of the second operational amplifier U2, and the second output channel CH2 of the digital-to-analog converter DAC is used for outputting the voltage control signal, the second output channel CH2 is connected with the fourth inverting end of the fourth operational amplifier U4 of the integral operational module through the first integral resistor R1, the fourth non-inverting end is grounded, one end of the integral capacitor C1 is connected to the connection point of the first integral resistor R1 and the fourth inverting end, and the other end of the integral capacitor C1 is connected to the fourth output end of the fourth operational amplifier U4, the output voltage passes through the fourth operational amplifier U4 of the integral operational module, and the ramp up and down can be realized, so that the overshoot of the later stage is avoided; in addition, the fourth output end is connected with the first non-inverting end of the first operational amplifier U1 through the first compensation resistor R3, so that the output voltage of the second output channel CH2 can be transmitted to the first operational amplifier U1 for real-time compensation; and the first output end of the first operational amplifier U1 is connected with the second non-inverting end of the second operational amplifier U2 of the adjustment output module, so that the voltage can be output to the second operational amplifier U2 for adjustment, the current can be enhanced, and the current output capability can be improved. Therefore, the output voltage and current of the present application can output the voltage value to the load output end through the fourth operational amplifier U4, the first operational amplifier U1 and the third operational amplifier U3, the real-time compensation function can be realized through the hardware circuit, and the stable voltage is output for providing the power supply to the load.

[0072] In addition, the line impedance of the tester itself, the impedance of the wire, the impedance of the DUT board, and the impedance influence of the test seat are compensated and fed back through the compensation feedback module, including the first operational amplifier U1 and the third operational amplifier U3, so that the output voltage can be fed back and compensated through the third operational amplifier U3 and output to the first operational amplifier U1 through the third compensation resistor R5, which can be used for compensating the voltage drop caused by the line impedance of the ATE device, the current detection resistor, the connection line impedance of the ATE device and the DUT board, and the deviation of the output of the next stage operational amplifier; in addition, the present application also sets the compensation capacitor C2 as high-frequency negative feedback, which can avoid the loss caused by the long line in the middle and the open loop of the operational amplifier.

[0073] As Figure 1 and Figure 2As shown, the embodiment of the present application can realize the measurement of current based on hardware circuit. Specifically, the process of outputting voltage to measure current is as follows: outputting voltage through the second output channel CH2 of the digital-to-analog converter DAC, taking the first output channel CH1 of the digital-to-analog converter DAC as current clamping, realizing current gear switching through the opening or closing of the first switch S1 and the second switch S2, and converting signals through the first input channel CH1, the second input channel CH2 and the third input channel CH3 of the analog-to-digital converter ADC to realize the measurement of different gear currents. That is, using the second output channel CH2 of the digital-to-analog converter DAC as a voltage regulating means; setting the first stage circuit as an integral operation module to realize slope up and down to avoid overshoot in the later stage, and the specific process can refer to the description of the above integral operation module embodiment; setting the second stage circuit as a feedback compensation circuit to compensate the deviation of line loss and amplification, and the specific process can refer to the description of the above feedback compensation module embodiment; setting the third stage circuit as an output adjustment module to expand the current and increase the voltage multiple; and setting a power supply detection circuit to detect the voltage across the sampling resistor through the current sampling operational amplifier, amplify to a certain multiple, and then measure the voltage through each channel of the analog-to-digital converter ADC, and then convert the voltage and resistance into current. It should be noted that at this time, the first input channel CH1 of the digital-to-analog converter DAC mainly limits the current of the amplification output circuit to realize clamping current.

[0074] The embodiment of the present application can realize the measurement of voltage based on hardware circuit. Specifically, the process of outputting current to measure voltage is as follows: outputting voltage through the first output channel CH1 of the digital-to-analog converter DAC to limit the size of the output current of the first operational amplifier U1, taking the second output channel CH2 of the digital-to-analog converter DAC as voltage clamping, and inputting to the fourth input channel CH4 of the analog-to-digital converter ADC through the sampling resistor and the voltage sampling operational amplifier U8 to realize the measurement of voltage. It should be noted that at this time, the voltage set by the second output channel CH2 of the digital-to-analog converter DAC is the clamping voltage, that is, the maximum level that can be reached in the output current process, which can limit the voltage output by the circuit.

[0075] The embodiment of the present application can realize real-time compensation through hardware circuit, which is fast and stable, can adjust the output voltage, and improves the stability of power supply; setting the integral operation module can realize no overshoot with different capacitive loads; moreover, the embodiment has the clamping function that ordinary power supply does not have, which can protect the load; in addition, the embodiment sets the current gear to improve the accuracy of different gear current measurement. The present application is proved to be feasible through experiments, simulation and use, and the specific effect diagram is as shown in Figure 8 , Figure 8 The waveform diagram of 0V rising to 42V, specifically, 0V rises to 42V, the later stage has a 47uF capacitor and a 42Ω resistor, the rising time is 0.9 milliseconds, and there is no obvious overshoot.

[0076] The second aspect embodiment of the present application provides a four-quadrant power supply, comprising the ATE-based four-quadrant power supply circuit of the first aspect embodiment.

[0077] The four-quadrant power supply provided by the embodiment of the present application comprises a digital-to-analog converter (DAC), a feedback compensation module, an output adjustment module and a load output end. The feedback compensation module is provided with a first operational amplifier (U1). The first non-inverting terminal of the first operational amplifier (U1) is connected with the second output channel (CH2), and the first inverting terminal of the first operational amplifier (U1) is connected with the first output terminal of the first operational amplifier (U1). The output adjustment module comprises a second operational amplifier (U2). The current control terminal of the second operational amplifier (U2) is connected with the first output channel (CH1), the second output terminal of the second operational amplifier (U2) is connected with the second inverting terminal of the second operational amplifier (U2), and the second non-inverting terminal of the second operational amplifier (U2) is connected with the first output terminal. Since the second operational amplifier (U2) is provided with the current control terminal and the current control terminal of the second operational amplifier (U2) is connected with the first output channel (CH1), the second operational amplifier (U2) can limit the size of the output current according to the current control signal of the first output channel (CH1). At the same time, since the first non-inverting terminal of the first operational amplifier (U1) is connected with the second output channel (CH2) and the second non-inverting terminal of the second operational amplifier (U2) is connected with the first output terminal, the first operational amplifier (U1) can control the size of the output voltage according to the voltage control signal output by the second output channel (CH2) and output the corresponding voltage to the second operational amplifier (U2). Since the second output terminal of the second operational amplifier (U2) is connected with the load output end, the second operational amplifier (U2) can output stable voltage to the load output end and be used for supplying power to the load. Moreover, the first output terminal of the first operational amplifier (U1) is connected with the first inverting terminal of the first operational amplifier (U1), and the second output terminal of the second operational amplifier (U2) is connected with the second inverting terminal of the second operational amplifier (U2), so that the negative feedback configuration is formed, thereby ensuring the stable operation of the circuit. In addition, the size of the current output can be limited through the current control terminal of the second operational amplifier (U2), and the size of the output voltage is adjusted, so that the real-time compensation function is realized, the voltage drop caused by the large current in the circuit is avoided, and the accuracy of the power supply is improved. Therefore, the output voltage can be adjusted, the real-time compensation function is realized, and the accuracy of the power supply is improved.

[0078] It should be noted that the embodiment of the present application can realize the functions of adjusting the output voltage, realizing the real-time compensation function and improving the accuracy of the power supply through the hardware structure, and does not involve the improvement of the method.

[0079] The embodiments of the present application are described in detail above with reference to the drawings, but the present application is not limited to the above-described embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present application.

Claims

1. An ATE-based four-quadrant power supply circuit, characterized by, include: A digital-to-analog converter (DAC) is used to receive and convert input signals to output corresponding control signals. The DAC includes a first output channel for outputting current control signals and a second output channel for outputting voltage control signals. The feedback compensation module includes a first operational amplifier, wherein the first non-inverting input of the first operational amplifier is connected to the second output channel, and the first inverting input of the first operational amplifier is connected to the first output terminal of the first operational amplifier. The output adjustment module includes a second operational amplifier, the current control terminal of the second operational amplifier is connected to the first output channel, the second output terminal of the second operational amplifier is connected to the second inverting terminal of the second operational amplifier, and the second non-inverting terminal of the second operational amplifier is connected to the first output terminal. The load output terminal is connected to the second output terminal to provide power to the load; The power detection module includes a sampling resistor and an analog-to-digital converter. The second output terminal is connected to the analog-to-digital converter, the first inverting terminal, and the load output terminal through the sampling resistor.

2. The ATE-based four-quadrant power supply circuit of claim 1, wherein, The power supply detection module includes a current sampling operational amplifier. The non-inverting current sampling input of the current sampling operational amplifier is connected to the connection point between the second output terminal and the sampling resistor. The inverting current sampling input of the current sampling operational amplifier is connected to the connection point between the sampling resistor and the load output terminal. The current sampling output terminal of the current sampling operational amplifier is connected to the analog-to-digital converter.

3. The ATE-based four-quadrant power supply circuit of claim 2, wherein, The power detection module includes multiple sampling resistors with different resistance values ​​and multiple current sampling operational amplifiers corresponding to each sampling resistor. The sampling resistors are connected in series. The two ends of each sampling resistor are connected to the current sampling input terminal of the corresponding current sampling operational amplifier. The current sampling output terminal of each current sampling operational amplifier is connected to the analog-to-digital converter. The two ends of N-1 sampling resistors are connected to short-circuit switches, where N represents the total number of sampling resistors.

4. The ATE-based four-quadrant power supply circuit of claim 1, wherein, The power detection module further includes a voltage sampling operational amplifier. The non-inverting input of the voltage sampling operational amplifier is connected to the sampling resistor, the inverting input of the voltage sampling operational amplifier is connected to the voltage sampling output terminal of the voltage sampling operational amplifier, and the voltage sampling output terminal is connected to the analog-to-digital converter.

5. The ATE-based four-quadrant power supply circuit of claim 1, wherein, The feedback compensation module includes a feedback operational amplifier module, which is equipped with a third operational amplifier. The third non-inverting input of the third operational amplifier is connected to the second output terminal, the third inverting input of the third operational amplifier is connected to the third output terminal of the third operational amplifier, and the third output terminal is connected to the first inverting input.

6. The ATE-based four-quadrant power supply circuit of claim 5, wherein, The feedback compensation module is provided with a first capacitor, a first resistor, a second resistor, a third resistor, a fourth resistor and a fifth resistor, one end of the first capacitor is connected with the first inverting terminal, the other end of the first capacitor is connected with the first output terminal, the first inverting terminal is grounded through the first resistor, one end of the second resistor is connected with the first inverting terminal, the other end of the second resistor is connected with the third output terminal, the third inverting terminal is grounded through the third resistor, the first output terminal is connected with the fifth resistor through the fourth resistor, the fifth resistor is connected with the load output terminal, and the third non-inverting terminal is connected to the connection point of the fourth resistor and the fifth resistor.

7. The ATE-based four-quadrant power supply circuit of claim 1, wherein, An integral operation module for preventing overshoot is arranged between the second output channel and the first non-inverting terminal, the integral operation module comprises a fourth operational amplifier, the fourth non-inverting terminal of the fourth operational amplifier is grounded, the fourth inverting terminal of the fourth operational amplifier is connected with the second output channel, and the fourth output terminal of the fourth operational amplifier is connected with the first non-inverting terminal.

8. The ATE-based four-quadrant power supply circuit of claim 7, wherein, The integral operation module is further provided with a second capacitor, a sixth resistor, a seventh resistor and an eighth resistor, the fourth inverting terminal is connected with the second output channel through the sixth resistor, the fourth non-inverting terminal is grounded through the seventh resistor, the fourth output terminal is connected with the fourth inverting terminal through the second capacitor, and the eighth resistor is connected with the second capacitor in parallel.

9. A four quadrant power supply characterized by, The four-quadrant power supply circuit based on ATE comprises the four-quadrant power supply circuit based on ATE as claimed in any one of claims 1 to 8.

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