Output control circuit, method and device and electronic load

Abstract

The invention discloses an output control circuit, method and device and an electronic load, the electronic load comprises a plurality of MOS transistors connected in parallel, and the circuit comprises a control unit and a plurality of differential input units. The plurality of differential input units correspond to the plurality of MOS tubes, the first input ends of the plurality of differential input units are connected with the output end of the control unit, and the output ends of the plurality of differential input units are correspondingly connected with the grid electrodes of the plurality of MOS tubes; the control unit is used for outputting a first control quantity to the first input ends of the plurality of differential input units under the condition that the electronic load is powered on, so that the output ends of the plurality of differential input units correspondingly output first control voltages to the grid electrodes of the plurality of MOS tubes, and the plurality of MOS tubes are controlled to be switched on; and under the condition of electronic load output, on the basis of outputting the first control quantity, a second control quantity is output to the first input ends of the plurality of differential input units, so that the output current of the plurality of MOS tubes is controlled.

Description

Technical Field

[0001] The present application relates to the technical field of electronic loads, and in particular to an output control circuit, method, device and electronic load. Background Art

[0002] Electronic load is a commonly used instrument in measurement and control technology. Electronic load controls the conduction of the internal MOS tube and consumes electrical energy by relying on the power dissipation of the MOS tube. It plays a very important role in the field of power supply testing.

[0003] When testing products such as GPU chip power supplies, Hall current sensors, and high-speed switching power supplies, the current response speed of the electronic load is required to be at the level of several μs. However, due to the existence of the MOS tube gate capacitance inside the electronic load, it takes a certain amount of time for the MOS tube to turn on. When the electronic load outputs current, the response speed is not fast enough and it is difficult to meet the requirements. Summary of the invention

[0004] The present application aims to provide an output control circuit, method, device and electronic load, which can improve the output current response speed of the electronic load.

[0005] In a first aspect, an embodiment of the present application provides an output control circuit, which is applied to an electronic load, wherein the electronic load includes a plurality of MOS tubes connected in parallel, and the circuit includes:

[0006] Control unit;

[0007] A plurality of differential input units, wherein the plurality of differential input units correspond to the plurality of MOS tubes, the first input ends of the plurality of differential input units are all connected to the output end of the control unit, and the output ends of the plurality of differential input units are correspondingly connected to the gates of the plurality of MOS tubes;

[0008] The control unit is used to output a first control amount to the first input ends of the plurality of differential input units when the electronic load is powered on, so that the output ends of the plurality of differential input units correspond to outputting a first control voltage to the gates of the plurality of MOS tubes, thereby controlling the plurality of MOS tubes to be turned on, and the first control voltage is a threshold voltage corresponding to the plurality of MOS tubes; when the electronic load is output, on the basis of outputting the first control amount, outputting a second control amount to the first input ends of the plurality of differential input units, so that the output ends of the plurality of differential input units correspond to outputting a second control voltage to the gates of the plurality of MOS tubes, thereby controlling the output currents of the plurality of MOS tubes.

[0009] According to some embodiments of the present application, the control unit includes an MCU, a first DAC and a second DAC, the first output end of the MCU is connected to the input end of the first DAC, the output end of the first DAC is connected to the first input ends of the plurality of differential input units, the second output end of the MCU is connected to the input end of the second DAC, the second DAC has a plurality of third output ends, the plurality of third output ends correspond to the plurality of differential input units, and the plurality of third output ends are correspondingly connected to the first input ends of the plurality of differential input units.

[0010] According to some embodiments of the present application, the control unit includes an MCU, a first DAC and a second DAC, the first output end of the MCU is connected to the input end of the first DAC, the output end of the first DAC is connected to the first input ends of multiple differential input units, the second output end of the MCU is connected to the input end of the second DAC, and the output end of the second DAC is connected to the first input ends of multiple differential input units.

[0011] According to some embodiments of the present application, there are multiple negative feedback units, the multiple negative feedback units correspond to the multiple MOS tubes, the multiple negative feedback units are correspondingly connected to the source electrodes of the multiple MOS tubes, the multiple negative feedback units are correspondingly connected to the first input terminals of the multiple differential input units, and the multiple negative feedback units are correspondingly connected to the second input terminals of the multiple differential input units.

[0012] According to some embodiments of the present application, it further includes:

[0013] A current detection unit, the current detection unit is connected to the control unit, and the current detection unit is used to respectively detect the output currents of the plurality of MOS tubes.

[0014] In a second aspect, an embodiment of the present application provides an output control method, which is applied to the output control circuit as described above, and the method includes:

[0015] When the electronic load is powered on, a first control quantity is output to the first input terminals of the plurality of differential input units, so that the output terminals of the plurality of differential input units correspond to output a first control voltage to the gates of the plurality of MOS transistors, thereby controlling the plurality of MOS transistors to be turned on, wherein the first control voltage is a threshold voltage corresponding to the plurality of MOS transistors;

[0016] In the case of the electronic load output, on the basis of outputting the first control quantity, the second control quantity is output to the first input ends of the plurality of differential input units, so that the output ends of the plurality of differential input units correspond to outputting the second control voltage to the gates of the plurality of MOS tubes, thereby controlling the output currents of the plurality of MOS tubes.

[0017] According to some embodiments of the present application, the control unit includes an MCU, a first DAC and a second DAC, the first output end of the MCU is connected to the input end of the first DAC, the output end of the first DAC is connected to the first input ends of the plurality of differential input units, the second output end of the MCU is connected to the input end of the second DAC, the second DAC has a plurality of third output ends, the plurality of third output ends correspond to the plurality of differential input units, and the plurality of third output ends are correspondingly connected to the first input ends of the plurality of differential input units;

[0018] The outputting of the first control amount to the first input terminals of the plurality of differential input units comprises:

[0019] The MCU outputs the first control amount to the first input terminals of the plurality of differential input units correspondingly through the plurality of third output terminals of the second DAC;

[0020] The outputting the second control amount to the first input terminals of the plurality of differential input units comprises:

[0021] The MCU outputs a second control amount to the first input terminals of the plurality of differential input units through the first DAC.

[0022] According to some embodiments of the present application, the output control circuit further includes a current detection unit, the current detection unit is connected to the control unit, and the current detection unit is used to respectively detect the output currents of the plurality of MOS tubes; the method further includes:

[0023] Outputting a third control amount to the plurality of MOS tubes, wherein the third control amount increases linearly from a preset initial value;

[0024] The output currents of the plurality of MOS tubes are obtained, and the third control amount corresponding to each output current of the MOS tube reaching a preset current threshold is used as the first control amount corresponding to the MOS tube.

[0025] In a third aspect, an embodiment of the present application provides an output control device, which is applied to the output control circuit as described above, comprising:

[0026] A first output module, used for outputting a first control quantity to first input ends of a plurality of differential input units when the electronic load is powered on, so that the output ends of the plurality of differential input units correspond to outputting a first control voltage to gates of a plurality of MOS transistors, thereby controlling the plurality of MOS transistors to be turned on, wherein the first control voltage is a threshold voltage corresponding to the plurality of MOS transistors;

[0027] The second output module is used to output a second control quantity to the first input ends of the plurality of differential input units on the basis of outputting the first control quantity when the electronic load is output, so that the output ends of the plurality of differential input units correspond to outputting a second control voltage to the gates of the plurality of MOS tubes, thereby controlling the output currents of the plurality of MOS tubes.

[0028] In a fourth aspect, an embodiment of the present application provides an electronic load, comprising the output control circuit as described above.

[0029] In a fifth aspect, an embodiment of the present application provides an electronic device, including:

[0030] at least one processor;

[0031] at least one memory for storing at least one program;

[0032] When at least one of the programs is executed by at least one of the processors, the output control method as described above is implemented.

[0033] In a sixth aspect, an embodiment of the present application provides a computer-readable storage medium, which stores a program executable by a processor, and the program executable by the processor is used to implement the output control method as described above when executed by the processor.

[0034] In the embodiment of the present application, when the electronic load is powered on, the first control amount is output first, thereby providing a threshold voltage to the gates of multiple MOS tubes, so that the multiple MOS tubes are in a conducting state. When the electronic load needs to output current, the second control amount is superimposed on the first control zero, and the output current of the MOS tube is controlled by the second control amount without waiting for the conduction time of the MOS tube. Compared with traditional electronic load technology, the embodiment of the present application improves the output current response speed.

[0035] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The present application is further described below with reference to the accompanying drawings and embodiments, wherein:

[0037] Figure 1 A circuit diagram of an embodiment of an output control circuit provided by the present application;

[0038] Figure 2 A flowchart of an output control method embodiment provided by the present application;

[0039] Figure 3 A schematic diagram of the structure of an embodiment of the output control device provided by the present application;

[0040] Figure 4 A schematic diagram of the structure of an embodiment of the electronic device provided in this application.

[0041] Reference numerals:

[0042] Output control device 100 , first output module 110 , second output module 120 , electronic device 200 , processor 210 , memory 220 . DETAILED DESCRIPTION

[0043] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0044] In the description of the present application, it should be understood that the descriptions involving orientation, such as the orientation or positional relationship indicated as up, down, etc., are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0045] In the description of this application, "a plurality" means more than two. If there is a description of "first" or "second", 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 the indicated technical features or implicitly indicating the order of the indicated technical features.

[0046] In the description of this application, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in this application based on the specific content of the technical solution.

[0047] Refer to the following Figures 1 to 4 An output control circuit, method, device and electronic load according to an embodiment of the present application are described.

[0048] The embodiment of the present application provides an output control circuit, which is applied to an electronic load. The electronic load includes a plurality of MOS tubes connected in parallel. The circuit includes:

[0049] Control unit;

[0050] A plurality of differential input units, the plurality of differential input units correspond to the plurality of MOS tubes, the first input ends of the plurality of differential input units are all connected to the output end of the control unit, and the output ends of the plurality of differential input units are correspondingly connected to the gates of the plurality of MOS tubes;

[0051] The control unit is used to output a first control amount to the first input ends of multiple differential input units when the electronic load is powered on, so that the output ends of the multiple differential input units correspond to outputting a first control voltage to the gates of multiple MOS tubes, thereby controlling the conduction of the multiple MOS tubes, and the first control voltage is a threshold voltage corresponding to the multiple MOS tubes; when the electronic load is output, on the basis of outputting the first control amount, outputting a second control amount to the first input ends of the multiple differential input units, so that the output ends of the multiple differential input units correspond to outputting the second control voltage to the gates of the multiple MOS tubes, thereby controlling the output currents of the multiple MOS tubes.

[0052] In the embodiment of the present application, when the electronic load is powered on, the first control amount is output first, thereby providing a threshold voltage to the gates of multiple MOS tubes, so that the multiple MOS tubes are in a conducting state. When the electronic load needs to output current, the second control amount is superimposed on the first control zero, and the output current of the MOS tube is controlled by the second control amount, without waiting for the conduction time of the MOS tube, thereby improving the output current response speed.

[0053] In some embodiments of the present application, each differential input unit includes a differential amplifier, the first input end of the differential input unit is the non-inverting input end of the differential amplifier, and the second input end of the differential input unit is the inverting input end of the differential amplifier. The output end of each differential amplifier is connected to the inverting input end through a corresponding capacitor, and the inverting input end of each differential amplifier is grounded through a corresponding first resistor. The inverting input end of each differential amplifier is connected to the reference voltage end through a corresponding second resistor, and the reference voltage end is used to provide a reference voltage to the second input end. The output end of each differential amplifier is connected to the gate of the MOS tube through a corresponding third resistor.

[0054] Some implementation methods of the present application, such as Figure 1 As shown, AMP1, AMP2, AMP3, and AMPn are all differential amplifiers, Q1, Q2, Q3, and Qn are all MOS tubes, R11, R21, R31, and Rn1 are all first resistors, R13, R23, R33, and Rn3 are all second resistors, REF is a reference voltage terminal, and R15, R25, R35, and Rn5 are all third resistors.

[0055] In one embodiment of the present application, a control unit includes an MCU, a first DAC and a second DAC, wherein a first output terminal of the MCU is connected to an input terminal of the first DAC, an output terminal of the first DAC is connected to first input terminals of a plurality of differential input units, a second output terminal of the MCU is connected to an input terminal of the second DAC, and the second DAC has a plurality of third output terminals, the plurality of third output terminals correspond to the plurality of differential input units, and the plurality of third output terminals are correspondingly connected to the first input terminals of the plurality of differential input units.

[0056] In this embodiment, the MCU outputs the first control amount to the first input ends of the plurality of differential input units through the plurality of third output ends of the second DAC. The MCU outputs the second control amount to the first input ends of the plurality of differential input units through the first DAC.

[0057] In some embodiments of the present application, since the second DAC is a multi-channel output DAC, the second DAC has multiple third output terminals, and the multiple third output terminals can independently output multiple first control quantities to corresponding MOS tubes, thereby independently controlling the corresponding MOS to turn on or off.

[0058] In some embodiments of the present application, since multiple third output terminals can independently output multiple first control quantities to corresponding MOS tubes, the specifications of the MOS tubes can be the same or different. It is only necessary to output the threshold voltage corresponding to the MOS tube model as the first control quantity to control the conduction of the corresponding MOS tube.

[0059] In some embodiments of the present application, the output terminal of the first DAC is connected to the non-inverting input terminal of each differential amplifier via a fourth resistor. The plurality of third output terminals of the second DAC are connected to the non-inverting input terminal of each differential amplifier via a fifth resistor.

[0060] like Figure 1 As shown, U1 is the MCU, U2 is the first DAC, and U3 is the second DAC. R12, R22, R32, and Rn2 are all fourth resistors. R14, R24, R34, and Rn4 are all fifth resistors.

[0061] In one embodiment of the present application, a control unit includes an MCU, a first DAC, and a second DAC, wherein a first output end of the MCU is connected to an input end of the first DAC, an output end of the first DAC is connected to first input ends of a plurality of differential input units, a second output end of the MCU is connected to an input end of the second DAC, and an output end of the second DAC is connected to first input ends of a plurality of differential input units.

[0062] In this embodiment, the MCU outputs the first control amount to the first input ends of the plurality of differential input units through the output end of the second DAC. The MCU outputs the second control amount to the first input ends of the plurality of differential input units through the first DAC.

[0063] In one embodiment of the present application, multiple negative feedback units correspond to multiple MOS tubes, multiple negative feedback units are correspondingly connected to the source electrodes of multiple MOS tubes, and multiple negative feedback units are correspondingly connected to the first input end and the second input end of multiple differential input units.

[0064] In this embodiment, the negative feedback unit uses the output current of the MOS tube to perform negative feedback regulation on the input quantity of the differential input unit, thereby improving the stability of the circuit.

[0065] In some embodiments of the present application, each negative feedback unit includes a sixth resistor, a first end of the sixth resistor is connected to the source of the MOS tube, a second end of the sixth resistor is grounded, the first end of the sixth resistor is connected to the second input end of the differential input unit through a seventh resistor, and the second end of the sixth resistor is connected to the first input end of the differential input unit through an eighth resistor.

[0066] Some implementation methods of the present application, such as Figure 1 As shown, R1s, R2s, R3s, and Rns are all sixth resistors, R16, R26, R36, and Rn6 are all seventh resistors, and R17, R27, R37, and Rn7 are all eighth resistors.

[0067] An embodiment of the present application further includes:

[0068] A current detection unit is connected to the control unit and is used to detect output currents of multiple MOS tubes respectively.

[0069] In this embodiment, since the differential input unit includes a differential amplifier, each differential amplifier has an offset voltage. When the offset voltage of the differential amplifier is negative, even if the first control amount is output according to the threshold voltage of the MOS tube, after the first control amount passes through the differential amplifier, the first control voltage output by the differential amplifier will be less than the threshold voltage, so that the MOS tube cannot be turned on in time.

[0070] In this embodiment, the second DAC is controlled to output the third control amount to multiple MOS tubes respectively, the third control amount increases linearly with a preset initial value, and the output current of each MOS tube is detected in real time by the current detection unit. The output current of each MOS tube reaches the third control amount corresponding to the preset current threshold as the first control amount corresponding to the MOS tube.

[0071] In some implementations of the present application, if the output current of the MOS tube reaches a preset current threshold, the MOS tube is considered to be in the on state. The preset current threshold can be set according to the actual application scenario, for example, the preset current threshold is set to 0.1 mA.

[0072] In some embodiments of the present application, the current detection unit includes multiple current sampling resistors, the multiple current sampling resistors correspond one-to-one to the multiple MOS tubes, the MCU is connected to the multiple MOS tubes through the multiple current sampling resistors, and the output currents of the multiple MOS tubes are obtained through the multiple current sampling resistors.

[0073] In some implementations of the present application, the current detection unit may also use a current sensor or an ammeter to detect the output currents of the plurality of MOS tubes.

[0074] In addition, an embodiment of the present application provides an output control method, which is applied to the output control circuit as described above. Figure 2 As shown, the method includes:

[0075] Step S100: when the electronic load is powered on, output a first control value to the first input terminals of the plurality of differential input units, so that the output terminals of the plurality of differential input units correspond to output a first control voltage to the gates of the plurality of MOS transistors, thereby controlling the plurality of MOS transistors to be turned on, wherein the first control voltage is a threshold voltage corresponding to the plurality of MOS transistors;

[0076] Step S200: In the case of electronic load output, on the basis of outputting the first control quantity, outputting the second control quantity to the first input end of multiple differential input units, so that the output ends of the multiple differential input units correspond to outputting the second control voltage to the gates of multiple MOS tubes, thereby controlling the output currents of the multiple MOS tubes.

[0077] In one embodiment of the present application, the control unit includes an MCU, a first DAC and a second DAC, wherein the first output end of the MCU is connected to the input end of the first DAC, the output end of the first DAC is connected to the first input ends of the plurality of differential input units, the second output end of the MCU is connected to the input end of the second DAC, the second DAC has a plurality of third output ends, the plurality of third output ends correspond to the plurality of differential input units, and the plurality of third output ends are correspondingly connected to the first input ends of the plurality of differential input units;

[0078] The step of “outputting the first control variable to the first input terminals of the plurality of differential input units” in step S100 includes:

[0079] Step S110: the MCU outputs the first control amount to the first input terminals of the plurality of differential input units via the plurality of third output terminals of the second DAC;

[0080] The step of “outputting the second control amount to the first input terminals of the plurality of differential input units” in step S200 includes:

[0081] Step S210: the MCU outputs a second control variable to first input terminals of a plurality of differential input units via a first DAC.

[0082] In one embodiment of the present application, the output control circuit further includes a current detection unit, the current detection unit is connected to the control unit, and the current detection unit is used to detect the output currents of the plurality of MOS tubes respectively; the method further includes:

[0083] Step S300: outputting a third control value to a plurality of MOS tubes, wherein the third control value increases linearly from a preset initial value;

[0084] Step S400: obtaining output currents of a plurality of MOS tubes, and taking a third control amount corresponding to when the output current of each MOS tube reaches a preset current threshold as a first control amount corresponding to the MOS tube.

[0085] The output control method provided in the application embodiment can implement each process implemented by the above-mentioned circuit embodiment and achieve the same beneficial effects. To avoid repetition, it will not be described here.

[0086] In addition, the embodiment of the present application provides an output control device 100, which is applied to the output control circuit as described above. Figure 3 As shown, including:

[0087] The first output module 110 is used to output a first control quantity to the first input terminals of the plurality of differential input units when the electronic load is powered on, so that the output terminals of the plurality of differential input units correspond to output a first control voltage to the gates of the plurality of MOS transistors, thereby controlling the plurality of MOS transistors to be turned on, and the first control voltage is a threshold voltage corresponding to the plurality of MOS transistors;

[0088] The second output module 120 is used to output a second control quantity to the first input ends of multiple differential input units on the basis of outputting the first control quantity when the electronic load is output, so that the output ends of the multiple differential input units correspond to outputting the second control voltage to the gates of the multiple MOS tubes, thereby controlling the output currents of the multiple MOS tubes.

[0089] The output control device 100 provided in the application embodiment can implement each process implemented by the above-mentioned circuit embodiment and achieve the same beneficial effects. To avoid repetition, it will not be described here.

[0090] In addition, an embodiment of the present application provides an electronic load, including the output control circuit as described above.

[0091] The electronic load provided in the application embodiment can implement each process implemented in the above circuit embodiment and achieve the same beneficial effects. To avoid repetition, it will not be described here.

[0092] In addition, an embodiment of the present application further discloses an electronic device 200, such as Figure 4 As shown, including:

[0093] at least one processor 210;

[0094] At least one memory 220, used to store at least one program;

[0095] When at least one program is executed by at least one processor 210 , the output control method as described above is implemented.

[0096] The electronic device provided in the application embodiment can implement each process implemented by the above-mentioned circuit embodiment and achieve the same beneficial effects. To avoid repetition, it will not be described here.

[0097] In addition, an embodiment of the present application provides a computer-readable storage medium, which stores a program executable by a processor. When the program executable by the processor is executed by the processor, it is used to implement the output control method as described above.

[0098] The computer-readable storage medium provided in the embodiment of the present application can implement the various processes implemented in the above-mentioned circuit embodiment and achieve the same beneficial effects. To avoid repetition, it will not be described here.

[0099] It will be appreciated by those skilled in the art that all or some of the steps and systems in the disclosed method above may be implemented as software, firmware, hardware and appropriate combinations thereof. Some physical components or all physical components may be implemented as software executed by a processor, such as a central processing unit, a digital signal processor or a microprocessor, or may be implemented as hardware, or may be implemented as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on a computer-readable medium, which may include a computer storage medium (or a non-transitory medium) and a communication medium (or a temporary medium). As known to those skilled in the art, the term computer storage medium includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program circuits or other data). Computer storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tapes, disk storage or other magnetic storage devices, or any other medium that may be used to store desired information and may be accessed by a computer. Furthermore, it is well known to those skilled in the art that communication media typically embodies computer readable instructions, data structures, program circuits, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media.

[0100] The embodiments of the present application are described in detail above in conjunction with the accompanying drawings, but the present application is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present application.

Claims

1. An output control circuit, characterized in that: Applied to an electronic load, the electronic load includes a plurality of MOS tubes connected in parallel, and the circuit includes: Control unit; A plurality of differential input units, wherein the plurality of differential input units correspond to the plurality of MOS tubes, the first input ends of the plurality of differential input units are all connected to the output end of the control unit, and the output ends of the plurality of differential input units are correspondingly connected to the gates of the plurality of MOS tubes; The control unit is used to output a first control amount to the first input ends of the plurality of differential input units when the electronic load is powered on, so that the output ends of the plurality of differential input units correspond to outputting a first control voltage to the gates of the plurality of MOS tubes, thereby controlling the plurality of MOS tubes to be turned on, and the first control voltage is a threshold voltage corresponding to the plurality of MOS tubes; when the electronic load is output, on the basis of outputting the first control amount, outputting a second control amount to the first input ends of the plurality of differential input units, so that the output ends of the plurality of differential input units correspond to outputting a second control voltage to the gates of the plurality of MOS tubes, thereby controlling the output currents of the plurality of MOS tubes.

2. The output control circuit according to claim 1, characterized in that: The control unit includes an MCU, a first DAC and a second DAC, wherein the first output end of the MCU is connected to the input end of the first DAC, the output end of the first DAC is connected to the first input ends of the plurality of differential input units, the second output end of the MCU is connected to the input end of the second DAC, the second DAC has a plurality of third output ends, the plurality of third output ends correspond to the plurality of differential input units, and the plurality of third output ends are correspondingly connected to the first input ends of the plurality of differential input units.

3. The output control circuit according to claim 1, characterized in that: The control unit includes an MCU, a first DAC and a second DAC, wherein the first output end of the MCU is connected to the input end of the first DAC, the output end of the first DAC is connected to the first input ends of the plurality of differential input units, the second output end of the MCU is connected to the input end of the second DAC, and the output end of the second DAC is connected to the first input ends of the plurality of differential input units.

4. The output control circuit according to claim 1, characterized in that: Also includes: Multiple negative feedback units, the multiple negative feedback units correspond to the multiple MOS tubes, the multiple negative feedback units are correspondingly connected to the source electrodes of the multiple MOS tubes, the multiple negative feedback units are correspondingly connected to the first input ends of the multiple differential input units, and the multiple negative feedback units are correspondingly connected to the second input ends of the multiple differential input units.

5. The output control circuit according to claim 1, characterized in that: Also includes: A current detection unit, the current detection unit is connected to the control unit, and the current detection unit is used to respectively detect the output currents of the plurality of MOS tubes.

6. An output control method, characterized in that: Applied to the output control circuit as claimed in claim 1, the method comprises: When the electronic load is powered on, a first control quantity is output to the first input terminals of the plurality of differential input units, so that the output terminals of the plurality of differential input units correspond to output a first control voltage to the gates of the plurality of MOS transistors, thereby controlling the plurality of MOS transistors to be turned on, wherein the first control voltage is a threshold voltage corresponding to the plurality of MOS transistors; In the case of the electronic load output, on the basis of outputting the first control quantity, the second control quantity is output to the first input ends of the plurality of differential input units, so that the output ends of the plurality of differential input units correspond to outputting the second control voltage to the gates of the plurality of MOS tubes, thereby controlling the output currents of the plurality of MOS tubes.

7. The output control method according to claim 6, characterized in that: The control unit includes an MCU, a first DAC and a second DAC, wherein the first output end of the MCU is connected to the input end of the first DAC, the output end of the first DAC is connected to the first input ends of the plurality of differential input units, the second output end of the MCU is connected to the input end of the second DAC, the second DAC has a plurality of third output ends, the plurality of third output ends correspond to the plurality of differential input units, and the plurality of third output ends are correspondingly connected to the first input ends of the plurality of differential input units; The outputting of the first control amount to the first input terminals of the plurality of differential input units comprises: The MCU outputs the first control amount to the first input terminals of the plurality of differential input units correspondingly through the plurality of third output terminals of the second DAC; The outputting the second control amount to the first input terminals of the plurality of differential input units comprises: The MCU outputs a second control amount to the first input terminals of the plurality of differential input units through the first DAC.

8. The output control method according to claim 6, characterized in that: The output control circuit further includes a current detection unit, which is connected to the control unit and is used to detect the output currents of the plurality of MOS tubes respectively; the method further includes: Outputting a third control amount to the plurality of MOS tubes, wherein the third control amount increases linearly from a preset initial value; The output currents of the plurality of MOS tubes are obtained, and the third control amount corresponding to each output current of the MOS tube reaching a preset current threshold is used as the first control amount corresponding to the MOS tube.

9. An output control device, applied to the output control circuit as claimed in claim 1, characterized in that: include: A first output module, used for outputting a first control quantity to first input ends of a plurality of differential input units when the electronic load is powered on, so that the output ends of the plurality of differential input units correspond to outputting a first control voltage to gates of a plurality of MOS transistors, thereby controlling the plurality of MOS transistors to be turned on, wherein the first control voltage is a threshold voltage corresponding to the plurality of MOS transistors; The second output module is used to output a second control quantity to the first input ends of the plurality of differential input units on the basis of outputting the first control quantity when the electronic load is output, so that the output ends of the plurality of differential input units correspond to outputting a second control voltage to the gates of the plurality of MOS tubes, thereby controlling the output currents of the plurality of MOS tubes.

10. An electronic load, characterized in that: The invention comprises the output control circuit as claimed in any one of claims 1 to 5.

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