CN112527045B - Modular high-current source capable of outputting arbitrary waveforms - Google Patents
Modular high-current source capable of outputting arbitrary waveforms Download PDFInfo
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- CN112527045B CN112527045B CN202011448590.6A CN202011448590A CN112527045B CN 112527045 B CN112527045 B CN 112527045B CN 202011448590 A CN202011448590 A CN 202011448590A CN 112527045 B CN112527045 B CN 112527045B
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
- G05F1/575—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices characterised by the feedback circuit
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Abstract
Disclosed is a modular high-current source capable of outputting arbitrary waveforms, comprising: a plurality of parallel constant current source modules, wherein each constant current source module comprises a positive and negative current sampling resistor RC1、RC2The power supply control circuit comprises a power supply module, a positive current sampling resistor, a negative current sampling resistor, a control reference ground, a power supply output, a power supply module and a control circuit, wherein one end of the positive current sampling resistor and the negative current sampling resistor is connected with a source electrode of an MOS (metal oxide semiconductor) tube, the other end of the positive current sampling resistor and the control reference ground are connected and serve as a positive electrode of the power supply output, and a negative electrode of the power supply output is connected with a central point of an input direct-current power supply. The modularized constant current source modules are connected in parallel to realize final large current output, and the output of the maximum current is adjusted by increasing the number of the parallel constant current source modules.
Description
Technical Field
The application relates to the field of linear power supplies, in particular to the field of power supplies which have high requirements on output current precision, complex waveform requirements and large amplitude.
Background
In some sensor and switch relay contact testing processes, a large current source is used, and the testing of a large-capacity battery or super capacitor application system needs a standard current source to simulate the current characteristics of a battery or a capacitor, so that high-precision large current capable of providing complex current waveforms is needed. In order to ensure the accuracy of the current waveform and reduce system interference, a linear power supply is generally used.
In order to obtain the required current, there are two general approaches, one is to use a high-precision voltage source and a resistance load connected in series to generate the required current, but the change of temperature will change the resistance value to cause the change of the output current, so that it is difficult to obtain the high-precision current. And the load resistance is not flexible to adjust, the continuous adjustment of the current amplitude is difficult to realize, and the power consumption is larger.
The other method is to change the feedback quantity of control into output current on the basis of a linear voltage source circuit so as to realize the control of the output current, and the circuit structure generally adopts a voltage follower structure based on an NMOS tube and a PMOS tube, but when the load impedance is larger, the control voltage of a power tube output by the control circuit is required to be higher, and a complex voltage amplification circuit needs to be designed. In order to enlarge the output current, MOS (metal oxide semiconductor) tubes are generally connected in parallel, but the modular design is difficult to realize, and the increase and decrease of the maximum output current are realized by increasing and decreasing modules.
Disclosure of Invention
The application provides a modular can export heavy current source of arbitrary waveform adopts modular design structure, can adjust the ability of current source output current through the quantity that increases and decreases parallel constant current source module, can improve the reliability of power greatly through increasing redundant module. The modular design also improves current source maintainability.
According to an aspect of the embodiments of the present application, there is provided a modular high-current source capable of outputting an arbitrary waveform, including:
a plurality of parallel constant current source modules, the constant current source modules comprising:
the power circuit comprises a positive power branch and a negative power branch, the positive power branch is connected with a plurality of NMOS tubes in parallel in series, the drain electrodes of the NMOS tubes are connected with the positive electrode of an input power supply, and the source electrodes of the NMOS tubes are connected with a positive current sampling resistor RC1One end of the positive current sampling resistor R is connected with the other end of the positive current sampling resistor RC1The other end is connected with a power supply load RLThe power load R, the positive reference terminal ofLThe negative reference end of the negative power branch circuit is connected with the serial middle point (power ground) of the input power supply, the negative power branch circuit is connected with a plurality of PMOS tubes in parallel, the drain electrodes of the PMOS tubes are connected with the negative electrode of the input power supply, and the source electrodes of the PMOS tubes and the negative current sampling resistor R are connected with each otherC2One end of the negative current sampling resistor R is connected with the negative current sampling resistor RC2And the other end of said power supply load RLA positive reference terminal connected to the power supply load R, a control reference groundLThe positive reference end is connected;
a control circuit including an operational amplifier A1、A2The operational amplifier A1、A2The same current given signal is connected to the same in-phase input terminal of the operational amplifier A1、A2The inverting input end of the operational amplifier is respectively connected with the source electrodes of the NMOS tube and the PMOS tube, and the operational amplifier A1、A2The output end of the power amplifier is respectively connected with the input ends of a first complementary power amplifier and a second complementary power amplifier, and the first complementary power amplifier and the second complementary power amplifier are respectively connected with the grids of the NMOS tube and the PMOS tube through grid driving resistors.
In some examples, the constant current source module further comprises two three-phase step-down transformers, and output ends of the two three-phase step-down transformers are connected in series after passing through a rectifying and filtering circuit to serve as the input power source of the constant current source module.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly described below.
Fig. 1 shows a block diagram of a modular high-current source capable of outputting arbitrary waveforms according to an embodiment of the present application.
Fig. 2 shows a topology of a constant current source module according to an embodiment of the present application.
Fig. 3 shows a block diagram of a system management control module according to an embodiment of the present application.
Detailed Description
Fig. 1 shows a block diagram of a modular high-current source capable of outputting any waveform, which comprises a system management control module and a plurality of parallel constant current source modules. The system management control module is used for completing the functions of man-machine interaction, control management and system monitoring. The constant current source modules have the same input and are two groups of same voltage sources, and the constant current source modules are obtained by rectifying and filtering two independent three-phase step-down transformers. The number of the constant current source modules is not limited, and when 10 constant current source modules capable of outputting +/-100A-level current are connected in parallel, the whole current source can output +/-1000A-level current.
The constant current source module is a core component of the whole current source and needs to solve three key problems: firstly, the input power supply and the control circuit are inconsistent in power supply voltage, and the structure of the traditional linear amplifier needs to be improved; secondly, the MOS tube parallel connection problem is solved, which requires that the MOS tube with better consistency is selected as much as possible and a drive circuit has enough drive capability; thirdly, the problems of control precision and control speed require the control circuit to adopt an amplifier with high gain, high speed and low temperature drift.
Every constant current source module includes positive and negative current sampling resistance, and the source electrode of MOS pipe is connected to positive and negative current sampling resistance one end, and the other end links to each other with the control reference ground and as power output's positive pole, and power output's negative pole then links to each other with input DC power supply's central point, has realized the independent control of the positive and negative current branch road of power like this, makes things convenient for parallelly connected of power module, and control circuit's working power supply and input DC power supply size and load size are irrelevant simultaneously.
Figure 2 shows a topology of a constant current source module. As shown in fig. 2, the positive power branch of the upper half generates a positive current and the negative power branch of the lower half generates a negative current. Q11～Q14And Q21～Q24The NMOS transistors and the PMOS transistors are respectively connected in parallel and are main circuit current adjusting transistors. Q1、Q2And Q3、Q4Respectively forming complementary circuits for driving respective MOS transistors, RC1And RC2The sampling resistor is a positive and negative current sampling resistor, which is a precise high-stability resistor. Vref is given current value, and when Vref is positive, the lower half operational amplifier A2Output high level, Q3Fully opening, outputting high level, quickly cutting off parallel PMOS tube, and operating amplifier A of upper half part1Then pass through Q1And Q2Control Q11～Q14Thereby controlling the positive current to track Vref. On the contrary, when Vref is negative, the NMOS tube of the upper half part is cut off, and the lower half part outputs negative current. It is apparent that changing the waveform and amplitude of Vref changes the waveform and amplitude of the output current. The number of the NMOS tubes connected in parallel in the positive power branch and the number of the PMOS tubes connected in parallel in the negative power branch are not limited in the application.
When positive current is output, the NMOS tube of the positive power branch circuit works, and the PMOS tube of the negative power branch circuit is cut off; when a negative current is output, the PMOS tube of the negative power branch circuit works, the NMOS tube of the positive power branch circuit is cut off, and the positive power branch circuit and the negative power branch circuit work in turn as required, so that the output of any current waveform is realized.
The current source adopts the modularized design, the capacity of adjusting the output current of the system by increasing or decreasing the number of the constant current source modules which are connected in parallel is realized, and the reliability of the system is improved by increasing the redundancy modules. The modular design improves system maintainability. The positive and negative output currents of the constant current source module have independent positive and negative power branches and independent positive and negative current sampling resistors (R)C1，RC2) And an independent positive and negative current closed-loop control circuit. One end of the positive and negative current sampling resistor is connected with the control reference ground, and the other end of the positive and negative current sampling resistor is respectively connected with the source electrodes of the NMOS tube and the PMOS tube. The inverting input ends of the closed-loop control operational amplifiers of positive and negative currents are respectively connected with the source electrodes of the NMOS tube and the PMOS tube, and the two operational amplifiers (A)1、A2) Is connected to the same current reference signal. When the current reference signal is positive, the output of the negative current control operational amplifier is positive, the PMOS tube is cut off, and the positive current sampling resistor RC1The voltage of (2) follows the given voltage, and positive current of a given magnitude is output; on the contrary, when the current reference signal is negative, the positive current control operational amplifier output is negative, the NMOS tube is cut off, and the negative current sampling resistor R is connected with the NMOS tubeC2The voltage changes along with the given current signal, and negative current with given magnitude is output. The output of the operational amplifier is controlled to be connected in series with a complementary power amplifier consisting of MOS tubes, the driving capability of the operational amplifier is increased, and the grid of each MOS tube connected in parallel is connected in series with the same driving resistor, so that the driving consistency of the MOS tubes is ensured.
The block diagram of the system management control module is shown in fig. 3, the control voltage of the output current is generated by a CPU through an FPGA, the CPU transmits corresponding waveform data to the FPGA, the FPGA outputs the waveform data by using a DDS technology, the waveform data is changed into an analog signal by a high-speed DA, and after being filtered by a filter, the same given voltage is transmitted to each constant current source module by using a voltage follower.
Meanwhile, the temperature, the input and output voltage and current, the input and output voltage and the current of the current source radiator and the temperature in the case, and the input and output voltage and current are monitored through a temperature and input and output voltage and current acquisition circuit and an AD converter.
Through setting, the current source can work in a constant voltage, constant current and constant power mode, and various output current waveforms can be edited according to requirements, so that various operation conditions required by the electric energy electrical property test system can be simulated.
Claims (1)
1. A modular high current source capable of outputting arbitrary waveforms, comprising:
a plurality of parallel constant current source modules, the constant current source modules comprising:
the power circuit comprises a positive power branch and a negative power branch, the positive power branch is connected with a plurality of NMOS tubes in parallel in series, the drain electrodes of the NMOS tubes are connected with the positive electrode of an input power supply, and the source electrodes of the NMOS tubes are connected with a positive current sampling resistor RC1One end of the positive current sampling resistor R is connected with the other end of the positive current sampling resistor RC1The other end is connected with a power supply load RLThe power load R, the positive reference terminal ofLThe negative reference end of the negative power branch circuit is connected with the serial middle point of the input power supply, the negative power branch circuit is connected with a plurality of PMOS tubes in parallel, the drain electrodes of the PMOS tubes are connected with the negative electrode of the input power supply, and the source electrodes of the PMOS tubes and the negative current sampling resistor R are connected with each otherC2One end of the negative current sampling resistor R is connected with the negative current sampling resistor RC2And the other end of said power supply load RLA positive reference terminal connected to the power supply load R, a control reference groundLThe positive reference end is connected;
a control circuit including an operational amplifier A1、A2The operational amplifier A1、A2The same current given signal is connected to the same in-phase input terminal of the operational amplifier A1、A2The inverting input end of the operational amplifier is respectively connected with the source electrodes of the NMOS tube and the PMOS tube, and the operational amplifier A1、A2The output end of the first complementary power amplifier is respectively connected with the input ends of a first complementary power amplifier and a second complementary power amplifier, and the first complementary power amplifier and the second complementary power amplifier are respectively connected with the grids of the NMOS tube and the PMOS tube through grid driving resistorsConnecting; and
and the output ends of the two three-phase step-down transformers are connected in series after passing through a rectification filter circuit to be used as the input power supply of the constant current source module.
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Effective date of registration: 20230515 Address after: 430223 4th floor, Hongye Building, 2nd Road, Science Park, Wuhan University, Donghu Development Zone, Wuhan City, Hubei Province Patentee after: WUHAN HAIO ELECTRIC CO.,LTD. Patentee after: WUHAN University Address before: 430223 4th floor, Hongye Building, 2nd Road, Science Park, Wuhan University, Donghu Development Zone, Wuhan City, Hubei Province Patentee before: WUHAN HAIO ELECTRIC CO.,LTD. |
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