Control circuit for a pulsed current source, and control method thereof

Abstract

The application provides a control circuit of a pulse current source and a control method thereof, and relates to the field of current sources. The control circuit comprises multiple linear control groups, a first capacitor and a controller. Each linear control group is used for controlling an output current, and each linear control group is connected in parallel. Each linear control group comprises multiple linear control units, and each linear control unit is connected in parallel. One end of the first capacitor is connected with an input device, and the other end of the first capacitor is connected with each linear control unit respectively. The controller is connected with each linear control unit respectively. The controller is used for acquiring a preset standard voltage, controlling the linear control units to sample, comparing the sampling voltage with the standard voltage, and obtaining a comparison result. According to the comparison result, the working states of each linear control group and each linear control unit are adjusted, and the linear control units in the working state are controlled to output the current, so that the rapid rising can be realized in the full current range.

Description

Technical Field

[0001] This application relates to the field of current source technology, specifically to a control circuit and control method for a pulse current source. Background Technology

[0002] Pulsed current sources are crucial devices for testing static parameters such as Rdson and Vsd of power devices or modules. During measurement, accuracy is affected by the temperature of the device under test (DUT). Reducing the temperature rise of the DUT is an effective way to improve measurement accuracy, which requires the pulsed current source to have a rapid rise rate. In related technologies, pulsed current sources exhibit a fast rise rate at high current outputs, but the rise rate slows significantly at low current outputs, making it impossible to achieve a rapid rise across the entire range. Summary of the Invention

[0003] This application provides a control circuit and control method for a pulse current source, which enables rapid rise across the entire current range.

[0004] The technical solution of this application embodiment is as follows: In a first aspect, embodiments of this application provide a control circuit for a pulse current source, the control circuit comprising: Multiple linear control groups, each of which is used to control the output current, are connected in parallel, and each linear control group includes multiple linear control units, which are connected in parallel. A first capacitor, one end of which is connected to the input device, and the other end of which is connected to each of the linear control units, the first capacitor being used to provide voltage to each linear control unit; Controllers, each of which is connected to one of the linear control units; The controller is used to acquire a preset standard voltage, control the linear control unit to sample, and obtain a sampled voltage; compare the sampled voltage with the standard voltage to obtain a comparison result; adjust the working state of each linear control group and each linear control unit according to the comparison result, and control the linear control unit in the working state to output a current corresponding to the standard voltage.

[0005] In the above technical solution, the control circuit of the pulse current source includes multiple linear control groups, a first capacitor, and a controller. Each linear control group is used to control the output current. The linear control groups are connected in parallel, and each linear control group includes multiple linear control units, which are also connected in parallel. By setting multiple linear control groups and multiple linear control units in each linear control group, it is beneficial to control the operation of multiple linear control units and meet the rapid rise of current output in different ranges. One end of the first capacitor is connected to the input device, and the other end of the first capacitor is connected to each linear control unit. The first capacitor is used to provide voltage to each linear control unit. The voltage provided by the first capacitor is input to each linear control unit to meet the current output in different ranges. The controller is connected to each linear control unit. The controller is used to acquire a preset standard voltage, control the linear control units to sample, and obtain the sampled voltage. The sampled voltage is compared with the standard voltage to obtain the comparison result. The working state of each linear control group and each linear control unit is adjusted according to the comparison result. According to different current output requirements, by adjusting which linear control units are in the working state, the rapid rise of current output in different ranges can be met. The linear control units in the working state are controlled to output current corresponding to the standard voltage, so that rapid rise can be achieved in the entire current range.

[0006] In some embodiments of this application, the linear control unit includes a first resistor, a MOSFET, and a compensation circuit. One end of the first resistor is connected to the first capacitor, and the other end of the resistor is connected to the first port of the MOSFET. The compensation circuit is used to sample the two ends of the first resistor to output a signal to adjust the impedance of the MOSFET. The second port of the MOSFET is connected to an output device.

[0007] In the above technical solution, the compensation circuit collects the current across the first resistor, processes it, and outputs an adjustment signal to adjust the impedance of the MOSFET, thereby achieving a rapid increase in the output current.

[0008] In some embodiments of this application, the compensation circuit includes a sampling module, a second resistor, a third resistor, a first arithmetic module, a second arithmetic module, and a fourth resistor. The first port and the second port of the sampling module are respectively connected to the two ends of the first resistor. The output terminal of the sampling module is connected to one end of the second resistor. The first input terminal of the first arithmetic module is connected to a voltage generation module. The second input terminal and the output terminal of the first arithmetic module are respectively connected to one end of the third resistor. The other end of the second resistor, the other end of the third resistor, and one end of the second capacitor are respectively connected to the first input terminal of the second arithmetic module. The second input terminal of the second arithmetic module is grounded. The output terminal of the second arithmetic module and the other end of the second capacitor are connected to one end of the fourth resistor. The other end of the fourth resistor is connected to the MOS transistor.

[0009] In the above technical solution, the output adjustment signal is calculated based on the current across the first resistor and the standard voltage through the second operation, and the impedance of the MOS transistor is adjusted to achieve a rapid increase in the output current.

[0010] In some embodiments of this application, the sampling module includes a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, and a third arithmetic module. One end of the fifth resistor is connected to one end of the first resistor, one end of the sixth resistor is connected to the other end of the first resistor, the other end of the fifth resistor and one end of the seventh resistor are respectively connected to the first input terminal of the third arithmetic module, the other end of the seventh resistor is grounded, the other end of the sixth resistor and one end of the eighth resistor are respectively connected to the second input terminal of the third arithmetic module, and the other ends of the third arithmetic module and the eighth resistor are respectively connected to one end of the second resistor.

[0011] In the above technical solution, differential sampling can quickly and accurately measure the current across the first resistor, and the third calculation module performs the calculation, making the output current more accurate.

[0012] In some embodiments of this application, the sampling module is a differential sampling module. Differential sampling is performed using the differential sampling module. Differential sampling can quickly and accurately measure the current difference across the first resistor, making the output current more accurate.

[0013] Secondly, embodiments of this application provide a control method for a pulse current source, applied to a control circuit of the pulse current source described in any one of the first aspects, wherein the control circuit includes multiple linear control groups, each of the linear control groups includes multiple linear control units, and the control method includes: A preset standard voltage is obtained, and each of the linear control units is controlled to sample the voltage to obtain the sampled voltage. The sampled voltage is compared with the standard voltage to obtain the comparison result; Based on the comparison results, adjust the operating state of each of the linear control groups and each of the linear control units, and control the linear control unit in the operating state to output a current corresponding to the standard voltage.

[0014] In the above technical solution, a preset standard voltage is obtained, and the linear control unit is controlled to sample the voltage to obtain the sampled voltage. The sampled voltage is compared with the standard voltage to obtain the comparison result. The working state of each linear control group and each linear control unit is adjusted according to the comparison result. According to different current output requirements, the linear control units are adjusted to be in the working state to meet the rapid rise of current output in different ranges. The linear control units in the working state are controlled to output the current corresponding to the standard voltage, so that rapid rise can be achieved in the full current range.

[0015] In some embodiments of this application, adjusting the operating state of each of the linear control groups and each of the linear control units according to the comparison result, and controlling the linear control unit in the operating state to output a current corresponding to the standard voltage, includes: If the comparison result shows that the standard voltage is greater than the sampling voltage, the standard voltage is distributed according to the number of each linear control group to obtain the group voltage corresponding to each linear control group. The grouped voltages are allocated according to the number of each linear control unit to obtain the unit voltage corresponding to each linear control unit; The linear control group and the linear control unit are adjusted to be in working state, and the sampled voltage is compensated so that the sampled voltage is the same as the standard voltage. The linear control unit in working state is controlled to output a current corresponding to the standard voltage.

[0016] In the above technical solution, based on the voltage allocated to each linear control group and each linear control unit, the linear control group and linear control unit are adjusted to be in working state according to the sampled voltage and the standard voltage. The linear control unit in working state is controlled to output current corresponding to the standard voltage, thereby achieving rapid rise across the entire current range.

[0017] In some embodiments of this application, before obtaining the preset standard voltage, the control method further includes: Get the trigger signal and chip select signal; The trigger signal and chip select signal are processed to obtain the calculation result; If the calculation result indicates a connected state, the standard voltage is obtained.

[0018] In the above technical solution, a pulse current source is activated based on the trigger signal and the chip select signal in order to perform the test on the device under test.

[0019] In some embodiments of this application, the step of performing calculations on the trigger signal and the chip select signal to obtain the calculation result includes: The trigger signal and the chip select signal are combined to obtain the result.

[0020] In the above technical solution, the trigger signal and the chip select signal are processed by parallel operation to meet the start-up conditions of the pulse current source.

[0021] In some embodiments of this application, each of the linear control units includes a first resistor and a compensation circuit, the compensation circuit including a sampling module, the sampling module being a differential sampling module; The process of controlling each of the linear control units to sample and obtain the sampled voltage includes: The differential sampling module is controlled to sample the current across the first resistor to obtain the sampled current; The sampling voltage is obtained based on the sampling current and the first resistor.

[0022] In the above technical solution, differential sampling can quickly and accurately measure the current difference across the first resistor, making the output current more accurate.

[0023] In summary, one or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages: 1. By employing multiple linear control groups connected in parallel, each linear control group including multiple linear control units connected in parallel, and the controller acquiring a preset standard voltage based on the voltage provided by the first capacitor, adjusting the operating state of the linear control groups and linear control units according to the standard voltage to meet the rapid rise of output current in different ranges, and controlling the output current of the linear control units in the operating state to correspond to the standard voltage, the problem of not being able to achieve rapid rise across the entire range in related technologies is solved. The embodiments of this application can achieve rapid rise across the entire current range.

[0024] 2. Differential sampling is performed using a differential sampling module. Differential sampling can quickly and accurately measure the current difference across the first resistor, resulting in a more accurate output current. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the control circuit of a pulse current source provided in one embodiment of this application; Figure 2 This is a schematic diagram of the linear control unit of the control circuit of the pulse current source provided in one embodiment of this application; Figure 3 This is a schematic flowchart of a pulse current source control method provided in one embodiment of this application; Figure 4 yes Figure 3 A flowchart illustrating a sub-step of step S130; Figure 5 This is a flowchart illustrating a control method for a pulse current source provided in another embodiment of this application. Detailed Implementation

[0026] To enable those skilled in the art to better understand the technical solutions in this specification, the technical solutions in the embodiments of this specification will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0027] In the description of the embodiments of this application, the words "for example" or "for instance" are used to indicate examples, illustrations, or explanations. Any embodiment or design that is described as "for example" or "for instance" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design options. Rather, the use of the words "for example" or "for instance" is intended to present the relevant concepts in a specific manner.

[0028] In the description of the embodiments of this application, the term "multiple" means two or more. For example, multiple systems means two or more systems, and multiple screen terminals means two or more screen terminals. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. The terms "comprising," "including," "having," and variations thereof all mean "including but not limited to," unless otherwise specifically emphasized.

[0029] This application provides a control circuit and control method for a pulsed current source. The control circuit includes multiple linear control groups, a first capacitor, and a controller. Each linear control group controls the output current, and the linear control groups are connected in parallel. Each linear control group includes multiple linear control units, which are also connected in parallel. By setting multiple linear control groups and multiple linear control units in each linear control group, it is beneficial to control the operation of multiple linear control units and to meet the rapid rise of current at different ranges. One end of the first capacitor is connected to an input device, and the other end of the first capacitor is connected to each linear control unit. The first capacitor is used to provide voltage to each linear control unit. The voltage provided by the first capacitor is input to each linear control unit to meet different current output ranges. A controller is connected to each linear control unit. The controller acquires a preset standard voltage and controls the linear control units to sample the voltage, obtaining a sampled voltage. The sampled voltage is compared with the standard voltage to obtain a comparison result. Based on the comparison result, the operating state of each linear control group and each linear control unit is adjusted. Depending on different current output requirements, by adjusting which linear control groups and which linear control units are in operation, rapid current rise can be achieved for different current output ranges. The linear control units in operation are controlled to output current corresponding to the standard voltage, enabling rapid current rise across the entire current range. Compared to related technologies that cannot achieve rapid current rise across the entire range, this embodiment of the application can achieve rapid current rise across the entire current range.

[0030] It should be noted that the control circuit of the pulse current source tests the static parameters such as Rdson and Vsd of the power device or module, and can achieve rapid rise across the entire current range, thus avoiding inaccurate testing caused by temperature effects on the power device or module.

[0031] The technical solutions provided in the embodiments of this application will be further described below with reference to the accompanying drawings.

[0032] Reference Figure 1 , Figure 1A schematic diagram of the control circuit for a pulse current source provided in an embodiment of this application is shown. The control circuit includes multiple linear control groups, a first capacitor C1, and a controller. Each linear control group is used to control the output current. The linear control groups are connected in parallel, and each linear control group includes multiple linear control units, which are also connected in parallel. By setting multiple linear control groups and multiple linear control units in each linear control group, it is beneficial to control the operation of multiple linear control units and meet the rapid rise of current output in different ranges. One end of the first capacitor C1 is connected to the input device, and the other end of the first capacitor C1 is connected to each linear control unit. The first capacitor C1 is used to provide voltage to each linear control unit. The voltage provided by the first capacitor C1 is input to each linear control unit to meet the current output in different ranges. For example, there are n linear control groups, and each linear control group has m linear control units.

[0033] In one embodiment, the controller is connected to each linear control unit. The controller is used to acquire a preset standard voltage, control the linear control units to sample, and obtain a sampled voltage. The sampled voltage is compared with the standard voltage to obtain a comparison result. The controller adjusts the working state of each linear control group and each linear control unit according to the comparison result. According to different current output requirements, the controller adjusts which linear control units are in the working state to meet the rapid rise of current output in different ranges. The controller controls the linear control units in the working state to output the current corresponding to the standard voltage, so that rapid rise can be achieved in the full current range.

[0034] like Figure 1 As shown, the linear control unit includes a first resistor R1, a MOSFET, and a compensation circuit. One end of the first resistor R1 is connected to a first capacitor C1. The current across the first resistor R1 is obtained based on the voltage provided by the first capacitor C1 and the voltage across the first resistor R1. The other end of the first resistor R1 is connected to the first port of the MOSFET. The compensation circuit samples the voltage across the first resistor R1 to adjust the impedance of the MOSFET using an output signal. By adjusting the impedance of the MOSFET, it is easier to output a current corresponding to a standard voltage. The second port of the MOSFET is connected to an output device. The more accurate current generated by the linear control unit is input to the output device to support parameter testing of the output device. The output device is a test power device or module.

[0035] like Figure 2As shown, the compensation circuit includes a sampling module, a second resistor R2, a third resistor R3, a first operational module A1, a second operational module A2, and a fourth resistor R4. The first and second ports of the sampling module are respectively connected to the two ends of the first resistor R1 to sample the current value of the first resistor R1. By sampling, the actual voltage value provided can be obtained, i.e., the sampling voltage. Based on this sampling voltage, it is beneficial to adjust the linear control group in the subsequent process to achieve a rapid rise in the output current. The output of the sampling module is connected to one end of the second resistor R2. The first input of the first arithmetic module A1 is connected to the voltage generation module, which can generate a standard voltage. The second input of the first arithmetic module A1 and the output of the second arithmetic module A2 are respectively connected to one end of the third resistor R3. The other ends of the second resistor R2, the other ends of the third resistor R3, and one end of the second capacitor C2 are respectively connected to the first input of the second arithmetic module A2. The second input of the second arithmetic module A2 is grounded. The output of the second arithmetic module A2 and the other end of the second capacitor C2 are connected to one end of the fourth resistor R4. The other end of the fourth resistor R4 is connected to the MOSFET. The first arithmetic module A1 and the second arithmetic module A2 perform calculations and output a signal to adjust the impedance of the MOSFET to achieve a rapid rise in current output.

[0036] It should be noted that the controller acquires the trigger signal Trigger and the chip select signal CS to control the pulse current source to start. The pulse current source is started according to the trigger signal Trigger and the chip select signal CS to acquire the standard voltage REF. Subsequently, based on the standard voltage and the sampled voltage, the second operation module A2 outputs an adjustment signal to adjust the impedance of the MOSFET in order to achieve a rapid rise in current output.

[0037] like Figure 2As shown, the sampling module includes a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, and a third arithmetic module A3. One end of the fifth resistor R5 is connected to one end of the first resistor R1, and one end of the sixth resistor R6 is connected to the other end of the first resistor R1 to sample the current value across the first resistor R1. The other ends of the fifth resistor R5 and the seventh resistor R7 are respectively connected to the first input terminal of the third arithmetic module A3, and the other end of the seventh resistor R7 is grounded. The other ends of the sixth resistor R6 and the eighth resistor R8 are respectively connected to the second input terminal of the third arithmetic module A3, and the other ends of the third arithmetic module A3 and the eighth resistor R8 are respectively connected to one end of the second resistor R2. The sampled current value is input into the third arithmetic module A3, and after calculation, the sampled current is output, which is then used to calculate the sampled voltage. Among them, the first operational module A1, the second operational module A2 and the third operational module A3 are all operational amplifiers. The first input terminal of the first operational module A1 is the positive input terminal and the second input terminal is the inverting input terminal; the second input terminal of the second operational module A2 is the positive input terminal and the first input terminal is the inverting input terminal; the first input terminal of the third operational module A3 is the positive input terminal and the second input terminal is the inverting input terminal.

[0038] In one embodiment, the sampling module is a differential sampling module, which uses a first resistor R1 to perform differential sampling. Differential sampling allows for quick and accurate measurement of the current difference across the first resistor R1, resulting in a more accurate output current. The sampling module can also be an average sampling module, which uses the first resistor R1 to perform average sampling. The output current is effectively controlled and adjusted based on the sampled current.

[0039] Reference Figure 3 , Figure 3 This is a flowchart illustrating the control method for a pulsed current source provided in an embodiment of this application. The control method for the pulsed current source is applied to the control circuit of the pulsed current source. The control circuit includes multiple linear control groups, and each linear control group includes multiple linear control units. The control method for the pulsed current source is executed by the controller. The control method for the pulsed current source includes steps S110, S120, and S130.

[0040] Step S110: Obtain a preset standard voltage, control each linear control unit to sample, and obtain the sampled voltage.

[0041] In one embodiment, the standard voltage is the reference voltage REF of the device under test. The voltage generation module provides the standard voltage, which facilitates rapid rise adjustment of the current output based on the standard voltage. Each linear control unit includes a first resistor R1 and a compensation circuit. The compensation circuit includes a sampling module, which is a differential sampling module. It controls each linear control unit to sample the current across the first resistor R1 to obtain the sampled voltage. Specifically, it controls the differential sampling module to sample the current across the first resistor R1 to obtain the sampled current, which facilitates the subsequent determination of the sampled voltage based on the sampled current. The differential sampling module includes a third arithmetic module A3, which records the sampled current at one end of the first resistor R1 as isense_n and the sampled current at the other end of the first resistor R1 as isense_n. After differential calculation by the third arithmetic module A3, the sampled current isense is obtained.

[0042] In another embodiment, the sampling module can also be an average sampling module, which controls each linear control unit to perform sampling. Specifically, the average sampling module is controlled to sample the current across the first resistor R1 to obtain the sampling current, which is beneficial for obtaining the sampling voltage based on the sampling current in the future.

[0043] In one embodiment, the sampled current is multiplied by the first resistor R1 to obtain the sampled voltage, which is beneficial for adjusting the output current according to the sampled voltage, so that the output current rises rapidly.

[0044] Step S120: Compare the sampled voltage with the standard voltage to obtain the comparison result.

[0045] In one embodiment, the second arithmetic module A2 is used to compare the sampled voltage with the standard voltage. The comparison result is either a large current output corresponding to a sampled voltage that is less than the standard voltage, or a small current output corresponding to a sampled voltage that is greater than the standard voltage, so as to achieve a full range of current output.

[0046] Step S130: Adjust the working state of each linear control group and each linear control unit according to the comparison result, and control the linear control unit in the working state to output the current corresponding to the standard voltage.

[0047] like Figure 4 As shown, the operating state of each linear control group and each linear control unit is adjusted according to the comparison results, and the linear control unit in the operating state is controlled to output a current corresponding to the standard voltage, including but not limited to the following steps: Step S131: If the comparison result shows that the standard voltage is greater than the sampling voltage, the standard voltage is distributed according to the number of each linear control group to obtain the group voltage corresponding to each linear control group.

[0048] In some possible embodiments of this application, when the comparison result shows that the standard voltage is greater than the sampling voltage, a large current output is achieved. First, the standard voltage is evenly distributed according to the number of linear control groups, resulting in grouped voltages for each linear control group, ensuring that the voltage of each linear control group is the same. By calculating the voltage corresponding to each linear control group, during compensation, it is determined which linear control groups need to operate and which do not, thereby enabling a rapid increase in output current across the entire range.

[0049] In other possible embodiments of this application, when the comparison result shows that the standard voltage is less than the sampling voltage, a small current output is achieved. First, the standard voltage is evenly distributed according to the number of linear control groups, resulting in grouped voltages for each linear control group, ensuring that the voltage of each linear control group is the same. By calculating the voltage corresponding to each linear control group, it is determined which linear control groups need to operate and which do not, thereby enabling a rapid increase in output current across the entire range.

[0050] For example, suppose the sampling voltage is 55V, the standard voltage is 100V, and there are 10 linear control groups, i.e., n=10. These 10 linear control groups are numbered from 1 to 10, and the voltage of each linear control group is 10V. At this time, the sampling voltage is less than the standard voltage. In order to make the output current rise quickly and in a short time, a compensation circuit is used to compensate so that the output current value is the current corresponding to 100V. Since the sampling voltage is 55V, 45V needs to be supplemented. The operating state of the linear control group is then adjusted according to this voltage.

[0051] Step S132: Distribute the grouped voltages according to the number of each linear control unit to obtain the unit voltage corresponding to each linear control unit.

[0052] In some possible embodiments of this application, the group voltages are then evenly distributed according to the number of each linear control unit, so that each novel control unit in each linear control group is allocated the same voltage, thus obtaining the unit voltage corresponding to each linear control unit, which is beneficial for the rapid increase of the output current across the entire range.

[0053] For example, suppose the sampling voltage is 55V, the standard voltage is 100V, and there are 10 linear control groups. These 10 linear control groups are numbered from 1 to 10 (n = 10). Each linear control group has a voltage of 10V, and each linear control group includes 10 linear control units (m = 10). The linear control units are also numbered from 1 to 10. At this time, the sampling voltage is less than the standard voltage. To ensure a rapid rise in output current with a short time, a compensation circuit is used to compensate, making the output current value the current corresponding to 100V. Since the sampling voltage is 55V, 45V needs to be supplemented. The operating state of the linear control groups and linear control units is then adjusted based on this voltage.

[0054] Step S133: Adjust the linear control group and linear control unit to be in working state, compensate the sampling voltage so that the sampling voltage is the same as the standard voltage, and control the linear control unit in working state to output the current corresponding to the standard voltage.

[0055] In some possible embodiments of this application, in order to ensure that the output current meets the requirements of the device under test, the linear control units are adjusted according to the above allocation to determine which are in an active state and which are not. Specifically, the adjustment method involves first determining the linear control group, then determining that each linear control unit in the linear control group is in an active state, and compensating for the sampling voltage to make it the same as the standard voltage, thereby meeting the current requirements of the device under test. After adjusting the operating state, the linear control units in the active state are controlled to output a current corresponding to the standard voltage. By adjusting the linear control units to be in an active state, it is possible to adapt to different ranges of provided voltage, thereby meeting the rapid rise of the output current across the entire range.

[0056] For example, assuming the sampling voltage is 55V, the standard voltage is 100V, and there are 10 linear control groups (numbered 1 to 10), each with a voltage of 10V, and each group includes 10 linear control units (numbered 1 to 10). The sampling voltage is less than the standard voltage. To achieve a rapid rise in output current with a short time, a compensation circuit is used to ensure the output current corresponds to 100V. Since the sampling voltage is 55V, 45V needs to be supplemented. Linear control groups 1 to 5 are activated, while groups 6 to 10 are deactivated, allowing for a supplement of 50V. Within linear control groups 1 to 5, all linear control units in groups 1 to 4 are activated, and linear control units 1 to 5 within each group are also activated, thus providing the 45V supplement. By adjusting the linear control groups and control units, a rapid rise in current across the entire output range can be achieved.

[0057] like Figure 5 As shown, before obtaining the preset standard voltage, the control method of the pulse current source also includes, but is not limited to, the following steps: Step S210: Obtain the trigger signal and chip select signal.

[0058] In one embodiment, a trigger signal controls the timing and frequency of pulse generation by the pulse current source. By activating or triggering the trigger signal, the pulse current source can be started, causing it to output a specific pulse current. The trigger signal can be an external signal, such as a pulse or trigger pulse from other system components; or it can be an internally generated signal, such as a timing trigger signal based on an internal timer or counter. The chip select signal is used to control the enable and disable operation of the current source. When the chip select signal is in the enabled state, the pulse current source is in an available state and can accept control commands from other system components. By controlling the state of the chip select signal, the pulse current source can be selectively enabled or disabled to control the output current. The control method and interface protocol of the chip select signal are determined according to the specific pulse current source design. Obtaining the trigger signal and chip select signal through the interface is beneficial for starting the pulse current source.

[0059] Step S220: Perform calculations on the trigger signal and chip select signal to obtain the calculation result.

[0060] In one embodiment, the trigger signal and the chip select signal are processed by parallel operation. The pulse current source can only be started when the trigger signal is in the triggered state and the chip select signal is in the connected state. If one aspect is not met, it cannot be started. The operation result is obtained through parallel operation, and the pulse current source is started according to the operation result to meet the measurement conditions of the device under test.

[0061] Step S230: If the calculation result indicates a connected state, obtain the standard voltage.

[0062] In one embodiment, if the calculation result indicates a connection transition, it means that the conditions for starting the pulse current source are met. Based on the specific device under test (DUT), the corresponding standard voltage is obtained to achieve parameter measurement. This standard voltage can be provided by a voltage generating device, which will not be elaborated here.

[0063] It should also be noted that the apparatus provided in the above embodiments is only illustrated by the division of the above functional modules. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above. In addition, the apparatus and method embodiments provided in the above embodiments belong to the same concept, and their specific implementation process can be found in the method embodiments, which will not be repeated here.

[0064] The above are merely exemplary embodiments of this disclosure and should not be construed as limiting the scope of this disclosure. Any equivalent changes and modifications made in accordance with the teachings of this disclosure shall still fall within the scope of this disclosure. Other embodiments of this disclosure will readily conceive of those skilled in the art upon consideration of the specification and the disclosure of practical truths.

[0065] This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not described in this disclosure. The specification and embodiments are to be considered exemplary only, and the scope and spirit of this disclosure are defined by the claims.

Claims

1. A control circuit for a pulse current source, characterized in that, The control circuit includes: Multiple linear control groups, each of which is used to control the output current, are connected in parallel, and each linear control group includes multiple linear control units, which are connected in parallel. A first capacitor, one end of which is connected to the input device, and the other end of which is connected to each of the linear control units, the first capacitor being used to provide voltage to each linear control unit; Controllers, each of which is connected to one of the linear control units; The controller is used to acquire a preset standard voltage, control the linear control unit to sample, and obtain a sampled voltage; compare the sampled voltage with the standard voltage to obtain a comparison result; adjust the working state of each linear control group and each linear control unit according to the comparison result, and control the linear control unit in the working state to output a current corresponding to the standard voltage, so that it can achieve rapid rise in the full current range; The linear control unit includes a first resistor, a MOSFET, and a compensation circuit. One end of the first resistor is connected to the first capacitor, and the other end of the first resistor is connected to the first port of the MOSFET. The compensation circuit is used to sample the two ends of the first resistor to output a signal to adjust the impedance of the MOSFET. The second port of the MOSFET is connected to an output device. The compensation circuit includes a sampling module, a second resistor, a third resistor, a first arithmetic module, a second arithmetic module, and a fourth resistor. The first and second ports of the sampling module are respectively connected to the two ends of the first resistor. The output terminal of the sampling module is connected to one end of the second resistor. The first input terminal of the first arithmetic module is connected to a voltage generation module. The second input terminal and the output terminal of the first arithmetic module are respectively connected to one end of the third resistor. The other end of the second resistor, the other end of the third resistor, and one end of the second capacitor are respectively connected to the first input terminal of the second arithmetic module. The second input terminal of the second arithmetic module is grounded. The output terminal of the second arithmetic module and the other end of the second capacitor are connected to one end of the fourth resistor. The other end of the fourth resistor is connected to the MOS transistor.

2. The control circuit for the pulse current source according to claim 1, characterized in that, The sampling module includes a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, and a third arithmetic module. One end of the fifth resistor is connected to one end of the first resistor, one end of the sixth resistor is connected to the other end of the first resistor, the other end of the fifth resistor and one end of the seventh resistor are respectively connected to the first input terminal of the third arithmetic module, the other end of the seventh resistor is grounded, the other end of the sixth resistor and one end of the eighth resistor are respectively connected to the second input terminal of the third arithmetic module, and the other ends of the third arithmetic module and the eighth resistor are respectively connected to one end of the second resistor.

3. The control circuit for the pulse current source according to claim 2, characterized in that, The sampling module is a differential sampling module.

4. A control method for a pulse current source, characterized in that, The control circuit applied to the pulse current source as described in any one of claims 1-3, the control circuit comprising a plurality of linear control groups, each of the linear control groups comprising a plurality of linear control units, the control method comprising: A preset standard voltage is obtained, and each of the linear control units is controlled to sample the voltage to obtain the sampled voltage. The sampled voltage is compared with the standard voltage to obtain the comparison result; Based on the comparison results, adjust the operating state of each of the linear control groups and each of the linear control units, and control the linear control unit in the operating state to output a current corresponding to the standard voltage.

5. The control method for the pulse current source according to claim 4, characterized in that, The step of adjusting the operating state of each of the linear control groups and each of the linear control units according to the comparison result, and controlling the linear control unit in the operating state to output a current corresponding to the standard voltage, includes: If the comparison result shows that the standard voltage is greater than the sampling voltage, the standard voltage is distributed according to the number of each linear control group to obtain the group voltage corresponding to each linear control group. The grouped voltages are allocated according to the number of each linear control unit to obtain the unit voltage corresponding to each linear control unit; The linear control group and the linear control unit are adjusted to be in working state, and the sampled voltage is compensated so that the sampled voltage is the same as the standard voltage. The linear control unit in working state is controlled to output a current corresponding to the standard voltage.

6. The control method for the pulse current source according to claim 4, characterized in that, Before acquiring the preset standard voltage, the control method further includes: Get the trigger signal and chip select signal; The trigger signal and chip select signal are processed to obtain the calculation result; If the calculation result indicates a connected state, the standard voltage is obtained.

7. The control method for the pulse current source according to claim 6, characterized in that, The step of processing the trigger signal and chip select signal to obtain the calculation result includes: The trigger signal and the chip select signal are combined to obtain the result.

8. The control method for the pulse current source according to claim 4, characterized in that, Each of the linear control units includes a first resistor and a compensation circuit, the compensation circuit including a sampling module, the sampling module being a differential sampling module; The process of controlling each of the linear control units to sample and obtain the sampled voltage includes: The differential sampling module is controlled to sample the current across the first resistor to obtain the sampled current; The sampling voltage is obtained based on the sampling current and the first resistor.

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