CN117908614A

CN117908614A - Control circuit of pulse current source and control method thereof

Info

Publication number: CN117908614A
Application number: CN202410084126.5A
Authority: CN
Inventors: 钱城晖; 毛赛君; 刘弘耀
Original assignee: Chenxin Technology Shanghai Co ltd
Current assignee: Chenxin Technology Shanghai Co ltd
Priority date: 2024-01-19
Filing date: 2024-01-19
Publication date: 2024-04-19

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 a plurality of linear control groups, a first capacitor and a controller, wherein each linear control group is used for controlling output current, each linear control group is connected in parallel, each linear control group comprises a plurality of linear control units, and each linear control unit is connected in parallel; one end of the first capacitor is connected with the input device, and the other end of the first capacitor is connected with each linear control unit respectively; the controller is respectively connected with each linear control unit; the controller is used for acquiring a preset standard voltage, controlling the linear control unit to sample, and comparing the sampled voltage with the standard voltage to obtain a comparison result; and regulating the working states of each linear control group and each linear control unit according to the comparison result, and controlling the linear control units in the working states to output current, so that the current can be quickly increased in the whole current range.

Description

Control circuit of pulse current source and control method thereof

Technical Field

The application relates to the technical field of current sources, in particular to a control circuit of a pulse current source and a control method thereof.

Background

The pulse current source is an important device for testing static parameters such as Rdson and Vsd of a power device or a module, and when in measurement, the measurement accuracy can be influenced by the temperature of the device to be measured, and reducing the temperature rise of the device to be measured is an effective means for improving the measurement accuracy, so that the rising speed of the pulse current source is required to be as high as possible. In the related art, the pulse current source rises fast when outputting large current, and the current rising speed is obviously slowed down when outputting small current, so that the full-range fast rising cannot be realized.

Disclosure of Invention

The application provides a control circuit of a pulse current source and a control method thereof, which can realize rapid rising in a full current range.

The technical scheme of the embodiment of the application is as follows:

In a first aspect, an embodiment of the present application provides a control circuit for a pulse current source, the control circuit including:

A plurality of linear control groups, each of the linear control groups being for controlling an output current, each of the linear control groups being connected in parallel, each of the linear control groups comprising a plurality of linear control units, each of the linear control units being connected in parallel;

One end of the first capacitor is connected with the input device, the other end of the first capacitor is respectively connected with each linear control unit, and the first capacitor is used for providing voltage for each linear control unit;

The controllers are respectively connected with the linear control units;

The controller is used for acquiring preset standard voltage and controlling the linear control unit to sample so as to obtain sampling voltage; comparing the sampling voltage with the standard voltage to obtain a comparison result; and regulating the working states of each linear control group and each linear control unit according to the comparison result, and controlling the linear control units in the working states to output currents corresponding to the standard voltages.

In the technical scheme, the control circuit of the pulse current source comprises a plurality of linear control groups, a first capacitor and a controller, wherein each linear control group is used for controlling output current, each linear control group is connected in parallel, each linear control group comprises a plurality of linear control units, each linear control unit is connected in parallel, and the plurality of linear control units are arranged in the plurality of linear control groups and each linear control group, so that the follow-up control of the operation of the plurality of linear control units is facilitated, and the rapid rising of current output in different ranges can be met; one end of the first capacitor is connected with the input device, the other end of the first capacitor is connected with each linear control unit respectively, the first capacitor is used for providing voltage for each linear control unit, and the voltage provided by the first capacitor is input into each linear control unit so as to meet the current output in different ranges; the controller is respectively connected with each linear control unit; the controller is used for acquiring preset standard voltage and controlling the linear control unit to sample so as to obtain sampling voltage; comparing the sampling voltage with a standard voltage to obtain a comparison result; according to the comparison result, the working states of each linear control group and each linear control unit are adjusted, and according to different current output requirements, the linear control units are adjusted to be in the working states so as to meet the requirements of rapid rising in different current output ranges, and the linear control units in the working states are controlled to output currents corresponding to standard voltages, so that rapid rising can be realized in the whole current range.

In some embodiments of the present application, the linear control unit includes a first resistor, a MOS transistor, and a compensation circuit, where one end of the first resistor is connected to the first capacitor, the other end of the resistor is connected to a first port of the MOS transistor, the compensation circuit is configured to sample two ends of the first resistor to output a signal to adjust impedance of the MOS transistor, and a second port of the MOS transistor is connected to an output device.

In the technical scheme, the compensation circuit collects the current at two ends of the first resistor, outputs the adjusting signal after being processed by the compensation circuit, and adjusts the impedance of the MOS tube so as to realize the rapid rising of the output current.

In some embodiments of the present application, the compensation circuit includes a sampling module, a second resistor, a third resistor, a first operation module, a second operation module, and a fourth resistor, where a first port and a second port of the sampling module are respectively connected to two ends of the first resistor, an output end of the sampling module is connected to one end of the second resistor, a first input end of the first operation module is connected to a voltage generating module, a second input end of the first operation module and an output end of the second operation module are respectively connected to one end of the third resistor, another end of the second resistor and another end of the third resistor, one end of the second capacitor is respectively connected to a first input end of the second operation module, a second input end of the second operation module is grounded, an output end of the second operation module and another end of the second capacitor are connected to one end of the fourth resistor, and another end of the fourth resistor is connected to the MOS tube.

According to the technical scheme, the output adjusting signal is calculated and output through the second operation according to the current and the standard voltage at the two ends of the first resistor, the impedance of the MOS tube is adjusted, and the output current is quickly increased.

In some embodiments of the present application, the sampling module includes a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, and a third operation module, where 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 end of the third operation 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 end of the third operation module, and the other ends of the third operation module and the eighth resistor are respectively connected to one end of the second resistor.

In the technical scheme, the currents at the two ends of the first resistor can be rapidly and accurately measured through differential sampling, and the currents are calculated through the third operation module, so that the output currents are accurate.

In some embodiments of the present application, the sampling module is a differential sampling module, and differential sampling is performed by using the differential sampling module, so that the current difference at two ends of the first resistor can be rapidly and accurately measured by differential sampling, so that the output current is more accurate.

In a second aspect, an embodiment of the present application provides a control method of a pulse current source, which is applied to the control circuit of the pulse current source in any one of the first aspects, where the control circuit includes a plurality of linear control groups, each of the linear control groups includes a plurality of linear control units, and the control method includes:

Acquiring preset standard voltage, and controlling each linear control unit to sample to obtain sampling voltage;

Comparing the sampling voltage with the standard voltage to obtain a comparison result;

and regulating the working states of each linear control group and each linear control unit according to the comparison result, and controlling the linear control units in the working states to output currents corresponding to the standard voltages.

In the technical scheme, a preset standard voltage is obtained, and the linear control unit is controlled to sample to obtain a sampling voltage; comparing the sampling voltage with a standard voltage to obtain a comparison result; according to the comparison result, the working states of each linear control group and each linear control unit are adjusted, and according to different current output requirements, the linear control units are adjusted to be in the working states so as to meet the requirements of rapid rising in different current output ranges, and the linear control units in the working states are controlled to output currents corresponding to standard voltages, so that rapid rising can be realized in the whole current range.

In some embodiments of the present application, the adjusting the operation state of each of the linear control groups and each of the linear control units according to the comparison result, controlling the linear control unit in the operation state to output a current corresponding to the standard voltage, includes:

When the comparison result is that the standard voltage is larger than the sampling voltage, carrying out voltage distribution on the standard voltage according to the number of the linear control groups to obtain grouping voltages corresponding to the linear control groups;

Distributing the grouping voltages according to the number of the linear control units to obtain unit voltages corresponding to the linear control units;

And adjusting the linear control group and the linear control unit to be in a working state, and compensating the sampling voltage so that the sampling voltage is the same as the standard voltage, and controlling the linear control unit in the working state to output a current corresponding to the standard voltage.

According to the technical scheme, the linear control groups and the linear control units are adjusted to be in a working state according to the voltage obtained by distribution of each linear control group and each linear control unit, and the linear control units in the working state are controlled to output currents corresponding to the standard voltages, so that rapid rising in the whole current range is realized.

In some embodiments of the present application, before the acquiring the preset standard voltage, the control method further includes:

Acquiring a trigger signal and a chip selection signal;

performing operation processing on the trigger signal and the chip selection signal to obtain an operation result;

and under the condition that the operation result is in a connection state, acquiring the standard voltage.

In the technical scheme, the pulse current source is started according to the trigger signal and the chip selection signal so as to test the tested device.

In some embodiments of the present application, the performing an operation process on the trigger signal and the chip select signal to obtain an operation result includes:

And carrying out parallel operation processing on the trigger signal and the chip selection signal to obtain the operation result.

In the technical scheme, the trigger signal and the chip selection signal are combined and operated so as to meet the starting condition of the pulse current source.

In some embodiments of the application, each of the linear control units comprises a first resistor and a compensation circuit, the compensation circuit comprising a sampling module, the sampling module being a differential sampling module;

The controlling each linear control unit to sample to obtain a sampling voltage includes:

controlling the differential sampling module to sample the current at two ends of the first resistor to obtain the sampling current;

and obtaining a sampling voltage according to the sampling current and the first resistor.

In the technical scheme, the difference of the currents at the two ends of the first resistor can be rapidly and accurately measured through differential sampling, so that the output current is accurate.

In summary, one or more technical solutions provided in the embodiments of the present application at least have the following technical effects or advantages:

1. Because a plurality of linear control groups are arranged, each linear control group is connected in parallel, each linear control group comprises a plurality of linear control units, each linear control unit is connected in parallel, a controller obtains preset standard voltage according to voltage provided by a first capacitor, the working states of the linear control groups and the linear control units are adjusted according to the standard voltage so as to meet the rapid rise when output currents in different ranges are output, the technical means for controlling the linear control units in the working states to output currents corresponding to the standard voltage is adopted, the problem that full-range rapid rise cannot be realized in the related art is solved, and the embodiment of the application can realize rapid rise in the full-current range.

2. The differential sampling module is utilized for differential sampling, and the current difference at two ends of the first resistor can be rapidly and accurately measured through differential sampling, so that the output current is accurate.

Drawings

FIG. 1 is a schematic diagram of a control circuit for a pulsed current source provided in one embodiment of the present application;

FIG. 2 is a schematic diagram of a linear control unit of a control circuit of a pulsed current source according to one embodiment of the present application;

FIG. 3 is a flow chart of a control method of a pulse current source according to an embodiment of the present application;

FIG. 4 is a schematic flow chart showing a sub-step of step S130 in FIG. 3;

fig. 5 is a flowchart of a control method of a pulse current source according to another embodiment of the present application.

Detailed Description

In order that those skilled in the art will better understand the technical solutions in the present specification, the technical solutions in the embodiments of the present specification will be clearly and completely described below with reference to the drawings in the embodiments of the present specification, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments.

In describing embodiments of the present application, words such as "for example" or "for example" are used to mean serving as examples, illustrations, or descriptions. Any embodiment or design described herein as "such as" or "for example" in embodiments of the application should not be construed as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "or" for example "is intended to present related concepts in a concrete fashion.

In the description of embodiments of the application, the term "plurality" means two or more. For example, a plurality of systems means two or more systems, and a plurality of screen terminals means two or more screen terminals. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating an indicated technical feature. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless expressly specified otherwise.

The embodiment of the application provides a control circuit of a pulse current source and a control method thereof, wherein the control circuit of the pulse current source comprises a plurality of linear control groups, a first capacitor and a controller, wherein each linear control group is used for controlling output current, each linear control group is connected in parallel, each linear control group comprises a plurality of linear control units, each linear control unit is connected in parallel, and the plurality of linear control units are arranged in each linear control group, so that the control circuit is beneficial to the follow-up control of the operation of the plurality of linear control units and can meet the rapid rise of current output in different ranges; one end of the first capacitor is connected with the input device, the other end of the first capacitor is connected with each linear control unit respectively, the first capacitor is used for providing voltage for each linear control unit, and the voltage provided by the first capacitor is input into each linear control unit so as to meet the current output in different ranges; the controller is respectively connected with each linear control unit; the controller is used for acquiring preset standard voltage and controlling the linear control unit to sample so as to obtain sampling voltage; comparing the sampling voltage with a standard voltage to obtain a comparison result; according to the comparison result, the working states of each linear control group and each linear control unit are regulated, and according to different current output requirements, the quick rise of current output in different ranges can be met by regulating which linear control groups and which linear control units are in the working states, and the linear control units in the working states are controlled to output currents corresponding to standard voltages, so that the quick rise can be realized in the whole current range. Compared with the prior art that the full-range rapid rise cannot be realized, the embodiment of the application can realize the rapid rise within the full current range.

It should be noted that, the control circuit of the pulse current source tests static parameters such as Rdson and Vsd of the power device or module to be tested, so that rapid rise can be realized in a full current range, and inaccurate test caused by temperature influence of the power device or module can be avoided.

The technical scheme provided by the embodiment of the application is further described below with reference to the accompanying drawings.

Referring to fig. 1, fig. 1 shows a schematic diagram of a control circuit of a pulse current source provided by an embodiment of the present application, where the control circuit of the pulse current source includes a plurality of linear control groups, a first capacitor C1, and a controller, each of the linear control groups is used for controlling an output current, each of the linear control groups is connected in parallel, each of the linear control groups includes a plurality of linear control units, each of the linear control units is connected in parallel, and by setting the plurality of linear control groups and setting the plurality of linear control units in each of the linear control groups, it is beneficial to subsequently control the operation of the plurality of linear control units, and rapid rising in different current output ranges can be satisfied; one end of a first capacitor C1 is connected with the input device, the other end of the first capacitor C1 is connected with each linear control unit respectively, the first capacitor C1 is used for providing voltage for each linear control unit, and the voltage provided by the first capacitor C1 is input into each linear control unit so as to meet current output in different ranges. Illustratively, the linear control groups have n groups, with m linear control units in each group.

In one embodiment, the controller is connected to each linear control unit; the controller is used for acquiring preset standard voltage and controlling the linear control unit to sample so as to obtain sampling voltage; comparing the sampling voltage with a standard voltage to obtain a comparison result; according to the comparison result, the working states of each linear control group and each linear control unit are adjusted, and according to different current output requirements, the linear control units are adjusted to be in the working states so as to meet the requirements of rapid rising in different current output ranges, and the linear control units in the working states are controlled to output currents corresponding to standard voltages, so that rapid rising can be realized in the whole current range.

As shown in fig. 1, the linear control unit includes a first resistor R1, an MOS tube, and a compensation circuit, one end of the first resistor R1 is connected to the first capacitor C1, and according to the voltage provided by the first capacitor C1 and the first resistor R1, the current at two ends of the first resistor R1 is obtained, the other end of the first resistor R1 is connected to a first port of the MOS tube, the compensation circuit is used for sampling two ends of the first resistor R1, so as to adjust the impedance of the MOS tube by using an output signal, and by adjusting the impedance of the MOS tube, the output of a current corresponding to a standard voltage is facilitated, a second port of the MOS tube is connected to an output device, and a relatively accurate current generated by the linear control unit is input to the output device, so as to support the parameter test of the output device. Wherein the output device is a test power device or module.

As shown in fig. 2, the compensation circuit includes a sampling module, a second resistor R2, a third resistor R3, a first operation module A1, a second operation module A2, and a fourth resistor R4, where a first port and a second port of the sampling module are respectively connected to two ends of the first resistor R1, and are used for sampling a current value of the first resistor R1, and the sampling can be used for obtaining a voltage value actually provided, that is, a sampling voltage, and according to the sampling voltage, the regulation of a linear control group is facilitated, so as to realize rapid rise when outputting a current. The output end of the sampling module is connected with one end of a second resistor R2, the first input end of a first operation module A1 is connected with a voltage generation module, standard voltage can be generated, the second input end of the first operation module A1 and the output end of the second operation module A2 are respectively connected with one end of a third resistor R3, the other end of the second resistor R2, the other end of the third resistor R3 and one end of a second capacitor C2 are respectively connected with the first input end of the second operation module A2, the second input end of the second operation module A2 is grounded, the output end of the second operation module A2 and the other end of the second capacitor C2 are connected with one end of a fourth resistor R4, the other end of the fourth resistor R4 is connected with an MOS tube, calculation is performed through the first operation module A1 and the second operation module A2, and a signal for adjusting the impedance of the MOS tube is output, so that rapid rising of current output is realized.

It should be noted that, the controller obtains Trigger signal Trigger and chip selection signal CS, controls the pulse current source to start, starts the pulse current source according to Trigger signal Trigger and chip selection signal CS, obtains standard voltage REF, and then according to standard voltage and sampling voltage, the second operation module A2 outputs an adjusting signal for adjusting the impedance of the MOS tube, so as to realize rapid rise in current output.

As shown in fig. 2, the sampling module includes a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, and a third operation module A3, one end of the fifth resistor R5 is connected to one end of the first resistor R1, one end of the sixth resistor R6 is connected to the other end of the first resistor R1, the current values at two ends of the first resistor R1 are sampled, one end of the fifth resistor R5 and one end of the seventh resistor R7 are respectively connected to the first input end of the third operation module A3, the other end of the seventh resistor R7 is grounded, one end of the sixth resistor R6 and one end of the eighth resistor R8 are respectively connected to the second input end of the third operation module A3, and the other ends of the third operation 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 a third operation module A3, and the sampled current is output through operation, so that the sampled voltage is conveniently obtained through subsequent calculation by using the sampled current. The first operation module A1, the second operation module A2 and the third operation module A3 are all operation amplifiers, a first input end of the first operation module A1 is a forward input end, and a second input end of the first operation module A1 is a reverse input end; the second input end of the second operation module A2 is a forward input end, and the first input end is a reverse input end; the first input end of the third operation module A3 is a forward input end, and the second input end is a reverse input end.

In an embodiment, the sampling module is a differential sampling module, and the differential sampling module is utilized to perform differential sampling on the first resistor R1, so that the current difference at two ends of the first resistor R1 can be rapidly and accurately measured through differential sampling, and the output current is accurate. The sampling module can also be an average sampling module and the like, average sampling is carried out by utilizing the first resistor R1 of the average sampling module, and the output current is effectively controlled and regulated by sampling the current provided by the sampling module.

Referring to fig. 3, fig. 3 is a flow chart of a control method of a pulse current source according to an embodiment of the present application. The control method of the pulse current source is applied to a control circuit of the pulse current source, the control circuit comprises a plurality of linear control groups, each linear control group comprises a plurality of linear control units, the control method of the pulse current source is executed by a controller, and the control method of the pulse current source comprises the steps S110, S120 and S130.

Step S110, obtaining preset standard voltage, and controlling each linear control unit to sample to obtain sampling voltage.

In an embodiment, the standard voltage is a reference voltage REF of the device under test, and the voltage generation module provides the standard voltage, so that the standard voltage is obtained to facilitate rapid rising adjustment during current output according to the standard voltage. Each linear control unit comprises a first resistor R1 and a compensation circuit, the compensation circuit comprises a sampling module, the sampling module is a differential sampling module, each linear control unit is controlled to sample, and the obtained sampling voltage is particularly controlled to sample the currents at two ends of the first resistor R1 by the differential sampling module, so that the obtained sampling current is favorable for obtaining the sampling voltage according to the sampling current. The differential sampling control module comprises a third operation module A3, the current sampled by one end of the first resistor R1 is recorded as isense_n, the current sampled by the other end of the first resistor R1 is recorded as isense_n, and differential calculation is carried out through the third operation module A3 to obtain the sampled current isense.

In another embodiment, the sampling module may be an average sampling module, and controls each linear control unit to sample, so as to obtain a sampled voltage, specifically, controls the average sampling module to sample the currents at two ends of the first resistor R1, so as to obtain a sampled current, which is favorable for obtaining the sampled voltage according to the sampled current.

In an embodiment, according to the obtained sampling current, the sampling current is multiplied by the first resistor R1 to obtain a sampling voltage, which is favorable for subsequent adjustment of the output current according to the sampling voltage, so that the output current rises rapidly.

Step S120, comparing the sampling voltage with the standard voltage to obtain a comparison result.

In an embodiment, the second operation module A2 is used to compare the sampled voltage with the standard voltage, so as to obtain a comparison result that the sampled voltage is smaller than the standard voltage and corresponds to a large current output, or a comparison result that the sampled voltage is greater than the standard voltage and corresponds to a small current output, so as to realize a full-range current output.

And step S130, adjusting the working states of each linear control group and each linear control unit according to the comparison result, and controlling the linear control unit in the working state to output current corresponding to the standard voltage.

As shown in fig. 4, the operation states of each linear control group and each linear control unit are adjusted according to the comparison result, and the linear control unit in the operation state is controlled to output a current corresponding to the standard voltage, including but not limited to the following steps:

Step S131, when the comparison result is that the standard voltage is larger than the sampling voltage, the standard voltage is distributed according to the number of each linear control group, and the grouping voltage corresponding to each linear control group is obtained.

In some possible embodiments of the present application, when the comparison result is that the standard voltage is greater than the sampling voltage, for high current output, the standard voltage is first distributed according to the number of each linear control group to obtain the grouping voltage corresponding to each linear control group, so that the voltages of each linear control group are the same. By calculating the voltage corresponding to each linear control group, when compensation is performed, it is determined which linear control groups need to work and which linear control groups do not need to work, so that the output current of the full range rises rapidly.

In other possible embodiments of the present application, when the comparison result is that the standard voltage is smaller than the sampling voltage, for small current output, the standard voltage is first distributed according to the number of each linear control group to obtain the grouping voltage corresponding to each linear control group, so that the voltages of each linear control group are the same. By calculating the voltage corresponding to each linear control group, it is determined which linear control groups need to operate and which linear control groups do not need to operate, so that the output current of the full range rises rapidly.

For example, assuming a sampling voltage of 55V, a standard voltage of 100V, there are 10 linear control groups, i.e., n is 10, the 10 linear control groups are numbered 1 to 10, and the voltage of each linear control group is 10V, at which time the sampling voltage is smaller than the standard voltage. In order to quickly rise the output current, the time consumption is short, the compensation circuit is used for compensation, the output current value is 100V corresponding current, 45V is needed to be supplemented because the sampling voltage is 55V, and the working state of the linear control group is adjusted according to the voltage.

Step S132, the grouping voltage is distributed according to the number of each linear control unit, and the unit voltage corresponding to each linear control unit is obtained.

In some possible embodiments of the present application, the grouping voltages are distributed evenly according to the number of the linear control units, so that the voltages distributed by the novel control units in each linear control group are the same, and the unit voltages corresponding to the linear control units are obtained, which is favorable for rapid rising of the output current in a full range.

For example, assuming that the sampling voltage is 55V, the standard voltage is 100V, there are 10 linear control groups, the 10 linear control groups are numbered, i.e., n is 10, numbered 1 to 10, the voltage of each linear control group is 10V, each linear control group includes 10 linear control units, i.e., m is 10, the linear control units are numbered, numbered 1 to 10, and the sampling voltage is smaller than the standard voltage. In order to quickly rise the output current, the time consumption is short, the compensation circuit is used for compensation, the output current value is 100V corresponding current, 45V is needed to be supplemented because the sampling voltage is 55V, and the working states of the linear control group and the linear control unit are adjusted according to the voltage.

And step S133, adjusting the linear control group and the linear control unit to be in an operating state, and compensating the sampling voltage so that the sampling voltage is the same as the standard voltage, and controlling the linear control unit in the operating state to output a current corresponding to the standard voltage.

In some possible embodiments of the application, in order to meet the requirements of the device to be measured for the output current, it is adjusted which of the linear control units is in operation and which is not in operation, according to the above-mentioned allocation. The specific adjustment mode is to determine the linear control group firstly, then determine that each linear control unit in the linear control group is in a working state, and compensate the sampling voltage so that the sampling voltage is the same as the standard voltage, and further meet the current requirement of the tested device. After the working state is adjusted, the linear control unit in the working state is controlled to output current corresponding to the standard voltage, and the linear control unit in the working state is adjusted to be suitable for the provided voltage in different ranges, so that the rapid rise of the output current in the whole range is met.

For example, assuming a sampling voltage of 55V, a standard voltage of 100V, 10 linear control groups are numbered, the 10 linear control groups are numbered 1 to 10, the voltage of each linear control group is 10V, each linear control group includes 10 linear control units, the linear control units are numbered 1 to 10, and the sampling voltage is smaller than the standard voltage. In order to quickly rise the output current, the time consumption is short, the compensation circuit is utilized to compensate the output current value to be the current corresponding to 100V, 45V is needed to be supplemented because the sampling voltage is 55V, the linear control groups 1 to 5 are adjusted to work, the linear control groups 6 to 10 are not operated, 50V can be supplemented, the linear control units in the linear control groups 1 to 5 are adjusted to be in the working state, and the linear control units 1 to 5 in the linear control groups can be satisfied to supplement 45V. The rapid rise in full range current output can be satisfied by adjusting the linear control group and the linear control unit.

As shown in fig. 5, the control method of the pulse current source further includes, but is not limited to, the following steps:

in step S210, a trigger signal and a chip select signal are acquired.

In one embodiment, the trigger signal controls the timing and frequency of the pulse generated by the pulse current source, and the pulse current source may be activated to output a specific pulse current by activating or triggering the trigger signal. The trigger signal may be an external signal, such as a pulse or trigger pulse from other system components; or may 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 enabling and disabling operations of the current source, and when the chip select signal is in an enabled state, the pulsed current source is in an enabled state and can accept control commands from other system components. The pulse current source can be selectively enabled or disabled by controlling the state of the chip select signal, so as to realize the control of the output current, and the control mode and the interface protocol of the chip select signal are determined according to the specific pulse current source design. And the trigger signal and the chip selection signal are acquired through the interface, so that the pulse current source can be started conveniently.

Step S220, the trigger signal and the chip selection signal are subjected to operation processing to obtain an operation result.

In an embodiment, the trigger signal and the chip selection signal are combined and operated, when the trigger signal is in a trigger state and the chip selection signal is in a connection state, the pulse current source can be started, and if one aspect is not satisfied, the pulse current source can not be started, an operation result is obtained through parallel operation, and the pulse current source is started according to the operation result so as to satisfy the measurement condition of the device to be measured.

In step S230, when the operation result is the connection state, the standard voltage is obtained.

In an embodiment, under the condition that the operation result is the connection state, the condition that the pulse current source is started is indicated to be satisfied, and the standard voltage corresponding to the tested device is obtained according to the specific tested device so as to realize parameter measurement. The standard voltage may be provided by a voltage generating means, which will not be described here in detail.

Also to be described is: in the device provided in the above embodiment, when implementing the functions thereof, only the division of the above functional modules is used as an example, in practical application, the above functional allocation may be implemented by different functional modules according to needs, that is, the internal structure of the device is divided into different functional modules, so as to implement all or part of the functions described above. In addition, the embodiments of the apparatus and the method provided in the foregoing embodiments belong to the same concept, and specific implementation processes of the embodiments of the method are detailed in the method embodiments, which are not repeated herein.

The above are merely exemplary embodiments of the present disclosure and are not intended to limit the scope of the present disclosure. That is, equivalent changes and modifications are contemplated by the teachings of this disclosure, which fall within the scope of the present disclosure. Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure.

This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a scope and spirit of the disclosure being indicated by the claims.

Claims

1. A control circuit for a pulsed current source, the control circuit comprising:

The controllers are respectively connected with the linear control units;

2. The control circuit of the pulse current source according to claim 1, wherein the linear control unit comprises a first resistor, a MOS tube, and a compensation circuit, one end of the first resistor is connected with the first capacitor, the other end of the resistor is connected with a first port of the MOS tube, the compensation circuit is used for sampling two ends of the first resistor to output signals to adjust impedance of the MOS tube, and a second port of the MOS tube is connected with an output device.

3. The pulse current source control circuit according to claim 2, wherein the compensation circuit comprises a sampling module, a second resistor, a third resistor, a first operation module, a second operation module and a fourth resistor, wherein a first port and a second port of the sampling module are respectively connected to two ends of the first resistor, an output end of the sampling module is connected to one end of the second resistor, a first input end of the first operation module is connected to a voltage generating module, a second input end of the first operation module and an output end of the second operation 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 end of the second operation module, a second input end of the second operation module is grounded, an output end of the second operation module and the other end of the second capacitor are connected to one end of the fourth resistor, and the other end of the fourth resistor is connected to the MOS tube.

4. The pulse current source control circuit according to claim 3, wherein the sampling module comprises a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor and a third operation module, one end of the fifth resistor is connected with one end of the first resistor, one end of the sixth resistor is connected with the other end of the first resistor, one end of the fifth resistor and one end of the seventh resistor are respectively connected with the first input end of the third operation module, the other end of the seventh resistor is grounded, one end of the sixth resistor and one end of the eighth resistor are respectively connected with the second input end of the third operation module, and the other ends of the third operation module and the eighth resistor are respectively connected with one end of the second resistor.

5. The control circuit of the pulse current source according to claim 4, wherein the sampling module is a differential sampling module.

6. A control method of a pulse current source, characterized by being applied to a control circuit of a pulse current source according to any one of claims 1 to 5, 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:

7. The method according to claim 6, wherein said adjusting the operation states of each of the linear control groups and each of the linear control units based on the comparison result, controlling the linear control units in the operation states to output currents corresponding to the standard voltages, comprises:

8. The control method of the pulse current source according to claim 6, wherein before the acquisition of the preset standard voltage, the control method further comprises:

Acquiring a trigger signal and a chip selection signal;

9. The method for controlling a pulse current source according to claim 8, wherein the performing an operation on the trigger signal and the chip select signal to obtain an operation result comprises:

10. The method of claim 6, wherein 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;