CN109936286B - Constant-current module series output voltage equalizing control circuit and parameter determining method - Google Patents

Constant-current module series output voltage equalizing control circuit and parameter determining method Download PDF

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CN109936286B
CN109936286B CN201910218348.0A CN201910218348A CN109936286B CN 109936286 B CN109936286 B CN 109936286B CN 201910218348 A CN201910218348 A CN 201910218348A CN 109936286 B CN109936286 B CN 109936286B
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constant current
voltage
control circuit
information
output
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CN109936286A (en
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周立功
彭浩
魏小忠
黎宇
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Guangzhou Zhiyuan Electronics Co Ltd
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Guangzhou Zhiyuan Electronics Co Ltd
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Abstract

The invention relates to a constant-current module serial output voltage-sharing control circuit and a parameter determination method. The voltage equalizing control circuit is used for acquiring the reference voltage information and the output voltage information of the constant current module, and outputting a constant current control reference signal to the constant current control circuit according to the output voltage information and the reference voltage information. The constant current control circuit is used for acquiring a constant current control reference signal and output current information of the constant current module, sending a control signal to the constant current module according to the constant current control reference signal and the output current information, and controlling the constant current module to output constant current and output voltage matched with the reference voltage information by the control signal.

Description

Constant-current module series output voltage equalizing control circuit and parameter determining method
Technical Field
The invention relates to the field of circuit control, in particular to a constant current module series output voltage equalizing control circuit and a parameter determining method.
Background
With the explosive development of the electronic circuit industry, test power supplies play an increasingly important role in research and production. In order to meet the requirements of different outputs, the test power supply not only needs to be capable of achieving high-voltage output, but also needs to be capable of achieving constant-current output.
In the production and development process, in order to obtain higher voltage output, a plurality of constant current test power supplies are usually connected in series for output. And because of the difference of parameters among the constant current test power supply modules or because of the difference of each constant current test power supply module and an external connecting line, when the constant current test power supply modules are output in series, the output voltage among the constant current test power supply modules is not equal easily. For a long time, when the voltage difference between each constant current test power supply module exceeds a certain limit, the constant current test power supply module is easy to damage.
Disclosure of Invention
Based on this, it is necessary to provide a voltage equalizing control circuit for serial output of the constant current modules, aiming at the technical problem that the constant current modules are not equalized when being output in serial.
The embodiment of the invention provides a constant current module serial output voltage-sharing control circuit, which comprises a voltage-sharing control circuit and a constant current control circuit, wherein the voltage-sharing control circuit and the constant current control circuit are respectively corresponding to the constant current module;
the voltage equalizing control circuit is used for acquiring reference voltage information and output voltage information of the constant current module and outputting a constant current control reference signal to the constant current control circuit according to the output voltage information and the reference voltage information;
The constant current control circuit is used for acquiring a constant current control reference signal and output current information of the constant current module, sending a control signal to the constant current module according to the constant current control reference signal and the output current information, and controlling the constant current module to output constant current and output voltage matched with the reference voltage information by the control signal.
In one embodiment, the voltage equalizing control circuit comprises a voltage acquisition unit, a voltage equalizing acquisition unit and a voltage equalizing compensation unit which correspond to each other;
The voltage acquisition unit is used for acquiring output voltage information of the corresponding constant current module and outputting the output voltage information to the corresponding voltage equalizing acquisition unit; the voltage-sharing bus is also used for outputting the output voltage information to the voltage acquisition units corresponding to other constant current modules;
The voltage-sharing acquisition unit is used for acquiring output voltage information of the corresponding voltage acquisition unit and voltage information of a voltage-sharing bus, determining reference voltage information according to the output voltage information and the voltage information of the bus, and outputting the reference voltage information to the voltage-sharing compensation unit;
the voltage equalizing compensation unit is used for acquiring reference current information, output voltage information and reference voltage information, compensating the reference current information according to the output voltage information and the reference voltage information to obtain a constant-current control reference signal, and outputting the constant-current control reference signal to the constant-current control circuit.
In one embodiment, the voltage acquisition unit comprises a differential amplifying circuit and a first voltage follower circuit;
The differential amplifying circuit is used for acquiring output voltage information of the corresponding constant current module, performing differential operation on the output voltage information to obtain first voltage information, and outputting the first voltage information to the first voltage follower circuit;
The first voltage follower circuit is used for acquiring first voltage information and outputting the first voltage information to the voltage equalizing acquisition unit and the voltage equalizing bus.
In one embodiment, the voltage equalizing acquisition unit comprises a second voltage follower circuit;
The second voltage follower circuit is used for acquiring the first voltage information and the voltage information of the voltage equalizing bus, determining the electric information corresponding to the maximum value as the reference voltage information according to the first voltage information and the voltage information of the voltage equalizing bus, and outputting the reference voltage information to the voltage equalizing compensation unit.
In one embodiment, the voltage equalizing compensation unit comprises an addition circuit and a transconductance arithmetic unit;
the transconductance arithmetic unit is used for obtaining first voltage information and reference voltage information, performing transconductance operation on the first voltage information and the reference voltage information to obtain current compensation information, and outputting the current compensation information to the addition arithmetic circuit;
The addition operation circuit is used for obtaining reference current information and current compensation information, carrying out addition operation on the reference current information and the current compensation information to obtain a constant-current control reference signal, and outputting the constant-current control reference signal to the constant-current control circuit.
In one embodiment, the differential amplifying circuit includes a first operational amplifier, and the first voltage follower circuit includes a second operational amplifier;
The first input end of the first operational amplifier is connected with the first voltage input end of the constant current module through a resistor R1, and is connected with the output end of the first operational amplifier through a resistor R2 and a first capacitor which are connected in parallel; the second input end of the first operational amplifier is connected with the second output end of the constant current module through a resistor R3 and grounded through a resistor R4 and a second capacitor which are connected in parallel; the output end of the first operational amplifier is connected with the second operational amplifier;
The first input end of the second operational amplifier is connected with the output end of the second operational amplifier, the second input end of the second operational amplifier is connected with the output end of the first operational amplifier, and the output end of the second operational amplifier is connected with the input end of the second voltage follower circuit and is used for being connected with the voltage equalizing bus.
In one embodiment, the second voltage follower circuit includes a third operational amplifier; the first input end of the third operational amplifier is connected with the output end of the third operational amplifier, and the second input end of the third operational amplifier is used for being respectively connected with the output end of the second operational amplifier and the voltage equalizing bus.
In one embodiment, a first input terminal of the transconductance operator is connected to an output terminal of the third operational amplifier, a second input terminal of the transconductance operator is connected to an output terminal of the first operational amplifier, an output terminal of the transconductance operator is connected to the addition circuit and is grounded through a third capacitor, and is grounded through a resistor R5 and a fourth capacitor connected in series.
In one embodiment, the adding operation circuit includes a fourth operational amplifier, a first input end of the fourth operational amplifier is used for obtaining the reference current information and is connected with an output end of the transconductance operation device; the second input end of the fourth operational amplifier is connected with the output end of the fourth operational amplifier through a resistor R6 and is grounded through a resistor R7; the output end of the fourth operational amplifier is used for being connected with the constant current control circuit.
The embodiment of the invention also provides a constant current output power supply system which comprises a plurality of constant current modules connected in series and a plurality of constant current module series output voltage-sharing control circuits corresponding to the constant current modules one by one, wherein the constant current module series output voltage-sharing control circuits are the constant current module series output voltage-sharing control circuits provided by the embodiments.
The embodiment of the invention also provides a method for determining the component parameters of the voltage equalizing control circuit, which comprises the following steps:
Obtaining a pole value of the constant current control circuit, a zero value of the constant current control circuit, gain at a low frequency of the constant current control circuit and maximum output voltage of the constant current control circuit, and simulating a transfer function of the constant current control circuit to obtain a simulation curve;
Compensating the analog curve, and determining a compensation zero value, a compensation pole value and the crossing frequency of the constant current control circuit;
And determining the resistance values of the resistor R1 and the resistor R2 and the capacitance value of the first capacitor according to the crossing frequency of the constant current control circuit and the maximum output voltage of the constant current module, and determining the capacitance values of the third capacitor and the fourth capacitor and the resistance value of the resistor R5 according to the compensation zero value and the compensation pole value.
In one embodiment, the process of obtaining the pole value of the constant current control circuit, the zero value of the constant current control circuit, and the gain at the low frequency of the constant current control circuit includes the steps of:
acquiring a baud graph curve of a constant current control circuit on a phase analyzer;
and obtaining a pole value of the constant current control circuit, a zero value of the constant current control circuit and a gain of the constant current control circuit at a low frequency according to the Bode graph curve.
In one embodiment, the process of determining the capacitance values of the third capacitor, the fourth capacitor and the resistance value of the resistor R5 according to the compensation zero value and the compensation pole value is obtained by the following expression:
Wherein fz is a zero value and fp is a pole value; c 3 is the capacitance value of the third capacitor, C 4 is the capacitance value of the fourth capacitor, and R 5 is the resistance value of the fifth resistor.
In one embodiment, the process of determining the resistance values of the resistor R1 and the resistor R2 and the capacitance value of the first capacitor according to the crossing frequency of the constant current control circuit and the maximum output voltage of the constant current module is obtained by the following expression:
Wherein f cross is the crossing frequency, C 1 is the capacitance value of the first capacitor, V max is the maximum output voltage, V is the maximum voltage of the constant current module, R 1 is the capacitance value of the resistor R1, and R 2 is the resistance value of the resistor R2.
The embodiment of the invention also provides a computing device for the component parameters of the voltage equalizing control circuit, which comprises:
the simulation module is used for obtaining the pole value of the constant current control circuit, the zero value of the constant current control circuit, the gain at the low frequency of the constant current control circuit and the maximum output voltage of the constant current control circuit, and simulating the transfer function of the constant current control circuit to obtain a simulation curve;
The compensation module is used for compensating the analog curve and determining a compensation zero value, a compensation pole value and the crossing frequency of the constant current control circuit;
The calculation module is used for determining the resistance values of the resistor R1 and the resistor R2 and the capacitance value of the first capacitor according to the crossing frequency of the constant current control circuit and the maximum output voltage of the constant current module, and determining the capacitance values of the third capacitor and the fourth capacitor and the resistance value of the resistor R5 according to the compensation zero value and the compensation pole value.
The embodiment of the invention also provides a storage medium, on which a computer program is stored, which when executed by a processor implements the steps of any of the method embodiments described above.
The constant current module series output voltage equalizing control circuit performs output control on the constant current modules by taking the acquired reference voltage information as the reference voltage, so that each constant current module realizes voltage equalizing control. The design is simple, and when any one constant current module has a problem, the maximum output voltage of the rest normal modules can be automatically selected for voltage equalizing control.
Drawings
FIG. 1 is a block diagram of a constant current module series output voltage equalizing control circuit according to an embodiment of the present invention;
fig. 2 is a block diagram of a constant current module series output voltage equalizing control circuit according to another embodiment of the present invention;
Fig. 3 is a circuit diagram of a series output voltage equalizing control circuit of three series constant current modules according to an embodiment of the present invention;
fig. 4 is a circuit diagram of a constant current module series output voltage equalizing control circuit according to an embodiment of the present invention;
FIG. 5 is a block diagram illustrating steps of a method for controlling series output voltage equalizing of constant current modules according to an embodiment of the present invention;
FIG. 6 is a block diagram illustrating steps for obtaining reference voltage information according to one embodiment of the present invention;
FIG. 7 is a block diagram illustrating steps for obtaining a constant current control reference signal according to reference voltage information and output voltage information according to an embodiment of the present invention;
FIG. 8 is a block diagram illustrating steps for obtaining a constant current control reference signal according to the first compensation information according to an embodiment of the present invention;
FIG. 9 is a block diagram illustrating the steps of sending a control signal to a constant current module according to output current information and a constant current control reference signal according to an embodiment of the present invention;
FIG. 10 is a block diagram of a constant current module series output voltage equalizing control device according to an embodiment of the present invention;
FIG. 11 is a block diagram illustrating steps of a method for determining parameters of components of a voltage equalizing control circuit according to an embodiment of the present invention;
FIG. 12 is a block diagram of steps for obtaining the pole and zero values of the transfer function of the constant current module according to one embodiment of the present invention.
Detailed Description
For a better understanding of the objects, technical solutions and technical effects of the present invention, the present invention will be further explained below with reference to the drawings and examples. Meanwhile, it is stated that the embodiments described below are only for explaining the present invention and are not intended to limit the present invention.
As shown in fig. 1, the embodiment of the invention provides a constant current module output series voltage equalizing control circuit, which comprises a voltage equalizing control circuit 1 and a constant current control circuit 2, wherein each constant current module 3 corresponds to one voltage equalizing control circuit 1 and one constant current control circuit 2 for control. The voltage equalizing control circuit 1 is connected with the constant current control circuit 2, the voltage equalizing control circuit 1 obtains output voltage information and reference voltage information of the constant current module, and a constant current control reference signal is output to the constant current control circuit 2 according to the output voltage information and the reference voltage information. The constant current control circuit 2 obtains a constant current control reference signal and output current of the constant current module, and sends a control signal to the constant current module according to the constant current control reference signal and the output current so as to control the constant current module to output constant current and output voltage corresponding to the reference voltage.
The constant current module 3 may be a DC/DC constant current module or an AC/DC constant current module. The voltage equalizing control circuit 1 is correspondingly arranged on each constant current module 3, and the process of acquiring the output voltage information of the constant current modules by the voltage equalizing control circuit 1 can be directly acquired by being connected with the output end of the constant current module 3, or indirectly acquire the output voltage information corresponding to the constant current module 3 by being connected with an intermediate operational amplifier circuit. After the voltage equalizing control circuit 1 processes the output voltage information, a constant current control reference signal is generated, and the constant current control reference signal is output to the constant current control circuit 2. The voltage equalizing control circuit 1 may perform an increasing process or a decreasing process on the output voltage information according to a certain scaling factor, or may perform a difference or an integration operation on the output voltage information to generate information that can be directly processed in a subsequent processing step.
The process of obtaining the output current of the constant current module 3 by the constant current control circuit 2 can be directly obtained by being connected with the current output end of the constant current module 3, or indirectly obtaining the output current information corresponding to the constant current module by being connected with an intermediate operational amplifier circuit. The constant current control circuit 2 processes the output current information and the constant current control reference signal to obtain a control signal, and the output current information and the constant current control reference signal may be processed by modulation operation or compensation operation, so long as the corresponding control signal can be obtained, and the constant current module 3 may be controlled. The control signal is used for controlling the constant current module to output constant current and controlling the constant current module 3 to output voltage matched with the reference voltage, so that voltage equalizing output is realized. The constant current control signal may be an analog control signal or a digital control signal.
According to the constant current module series output voltage equalizing control circuit, the constant current control circuit 2 outputs a constant current control reference signal to control through collecting reference voltage information as a control reference, so that each constant current module 3 realizes voltage equalizing control. The design is simple, and when any module has a problem, the maximum output voltage of the rest normal modules can be automatically selected for voltage equalizing control.
In one embodiment, as shown in fig. 2, the voltage equalizing control circuit 1 includes a voltage acquisition unit 11, a voltage equalizing acquisition unit 12, and a voltage equalizing compensation unit 13.
Wherein, the voltage equalizing acquisition unit 12 is respectively connected with the voltage acquisition unit 11 and the voltage equalizing compensation unit 13. The voltage acquisition unit 11 is used for acquiring output voltage information of the constant current module 3 corresponding to the output voltage information, and outputting the output voltage information to the voltage equalizing acquisition unit 12. The voltage acquisition unit 11 is further used for sending output voltage information to the voltage acquisition units 11 of other constant current modules through the voltage equalizing bus 100. The voltage acquisition unit 11 may process the output voltage information and output the processed output voltage information to the voltage equalizing acquisition unit 12, or may directly transfer the output voltage information to the voltage equalizing acquisition unit 12. The voltage-equalizing collecting unit 12 obtains the output voltage information sent from the voltage collecting unit 11, and obtains the voltage information of the voltage-equalizing bus 100. The voltage information of the voltage-sharing bus 100 is obtained, namely, the voltage information output by the voltage acquisition unit 11 of other constant current modules transmitted from the voltage-sharing bus 100 is obtained. After acquiring these pieces of information, the voltage-equalizing acquisition unit 12 determines one piece of voltage information therefrom as reference voltage information to output to the voltage-equalizing compensation unit 13. The reference voltage information may be obtained by selecting, as the reference voltage information, voltage information having the minimum voltage value from the voltage information outputted by the voltage-sharing collection unit 12 and the voltage information of the voltage-sharing bus 100, or by selecting, as the reference voltage information, voltage information having the maximum voltage value, and may be designed according to the actual requirements and circuit characteristics. The voltage equalizing compensation unit 13 is connected with the voltage equalizing acquisition unit 12 and the voltage acquisition unit 11 respectively, and is used for acquiring reference voltage information, output voltage information and reference current information, compensating the reference current information according to the reference voltage information and the output voltage information to obtain a constant current control reference signal, and outputting the constant current control reference signal to the constant current control circuit 2.
In some embodiments, the voltage acquisition unit 11 may be a digital chip, a voltage follower circuit, or a combination of multiple analog circuits, such as a multi-stage combination circuit of a differential amplifier circuit and a voltage follower circuit.
As shown in fig. 3 and 4, the present embodiment is described in detail with a multi-stage combination circuit in which the voltage acquisition unit 11 includes a differential amplifying circuit and a first voltage follower circuit. The differential amplifying circuit obtains output voltage information of the constant current module corresponding to the differential amplifying circuit, performs voltage proportion operation processing on the output voltage information, performs proper attenuation and environmental interference suppression to obtain first voltage information, and outputs the first voltage information to the first voltage follower circuit. The first voltage follower circuit outputs first voltage information to the voltage equalizing acquisition unit 12 and the voltage equalizing bus 100, respectively.
Optionally, the differential amplifying circuit includes a first operational amplifier U1, and the first voltage follower circuit includes a second operational amplifier U2. The first input end of the first operational amplifier U1 is connected with the first voltage output end of the corresponding constant current module through a resistor R1, and is connected with the output end of the first operational amplifier U1 through a resistor R2 and a first capacitor which are connected in parallel. The second input end of the first operational amplifier U1 is connected with the second output end of the corresponding constant current module through a resistor R3 and grounded through a resistor R4 and a second capacitor which are connected in parallel. The output end of the first operational amplifier U1 is connected with the second operational amplifier U2. The first operational amplifier U1 is configured to perform differential operation on the input current and then output first voltage information to the second operational amplifier U2.
The first input end of the second operational amplifier U2 is connected with the output end of the second operational amplifier U2, and the second input end of the second operational amplifier U2 is connected with the output end of the first operational amplifier U1. Optionally, the output terminal of the first operational amplifier U1 is grounded through a first grounding resistor R00, and the remote terminal of the first grounding resistor R00 is connected to the second input terminal of the second operational amplifier U2, so as to perform voltage input to the second operational amplifier U2. The output end of the second operational amplifier U2 is connected with the voltage-sharing acquisition circuit and is also connected with the voltage-sharing bus 100, and is used for outputting first voltage information to the voltage-sharing acquisition unit 12 and outputting the first voltage information of the constant current module to the voltage-sharing control circuit 1 of other constant current modules through the voltage-sharing bus 100 so as to drive the voltage-sharing bus 100.
In some embodiments, the voltage equalizing acquisition unit 12 may be a comparison circuit or a selection circuit. Optionally, the embodiment is described in detail with the voltage equalizing acquisition unit 12 including a second voltage follower circuit. The second voltage follower circuit obtains the first voltage information output by the first voltage follower circuit and obtains the voltage information of the voltage equalizing bus 100, and the second voltage follower circuit outputs one of the first voltage information and the voltage information of the voltage equalizing bus 100, which corresponds to the largest voltage value, as the reference voltage information to the voltage equalizing compensation circuit. Alternatively, the second voltage follower circuit may be the third operational amplifier U3. The first input end of the third operational amplifier U3 is connected with the output end of the third operational amplifier U3, the second input end of the third operational amplifier U3 is connected with the output end of the second operational amplifier U2, and the second input end of the third operational amplifier U3 is also used for being connected with the equalizing bus 100 and grounded through the second grounding resistor R01.
In some embodiments, the voltage equalizing compensation unit 13 may be a transconductance operator gm1 and an addition operation circuit. The transconductance arithmetic unit gm1 is configured to obtain first voltage information and reference voltage information, perform a first compensation operation on the first voltage information and the reference voltage information, convert an input voltage into a current, output the current, obtain first compensation information, and output the first compensation information to the addition arithmetic circuit. The addition operation circuit obtains the first compensation information and the reference current information, performs superposition operation on the first compensation information and the reference current information to obtain a constant current control reference signal, and outputs the constant current control reference signal to the constant current control circuit 2. The superposition operation may be simple addition of the current values indicated by the first compensation information and the reference current information, or addition after performing inversion processing on one of the current values, or addition after performing inversion processing on both of the current values, and may be set according to design requirements, which may be implemented by a person skilled in the art through setting an addition circuit, for example, setting the addition circuit as an addition operator, which will not be described herein. Optionally, a first input terminal of the transconductance operator gm1 is connected to an output terminal of the third operational amplifier U3, a second input terminal of the transconductance operator gm1 is connected to an output terminal of the first operational amplifier U1, and an output terminal of the transconductance operator gm1 is connected to an addition operational circuit. Optionally, the output terminal of the transconductance operator gm1 is further grounded through a third capacitor, and through a resistor R5 and a fourth capacitor connected in series.
Alternatively, the addition operation circuit may be the fourth operational amplifier U4. The first input terminal of the fourth operational amplifier U4 is connected to the output terminal of the transconductance operator gm1, and the second input terminal of the fourth operational amplifier U4 is grounded and connected to the output terminal of the fourth operational amplifier U4. Optionally, the second input terminal of the fourth operational amplifier U4 is connected to the output terminal of the fourth operational amplifier U4 through a resistor R6 and is grounded through a resistor R7. The first input terminal of the fourth operational amplifier U4 is connected to the output terminal of the transconductance operator gm1 through a resistor R8, and receives the reference current information through a resistor R9.
As shown in fig. 4, in one embodiment, the constant current control circuit 2 includes a current acquisition unit, a reference signal acquisition unit, a current compensation unit, and a control unit. The current acquisition unit is used for acquiring output current information of the constant current module and outputting the output current information to the current compensation unit. Alternatively, the current collecting unit may be configured to directly output the output current information to the current compensating unit, or may be configured to process the output current information and then output the processed output current information to the current compensating unit, for example, to perform filtering processing or arithmetic processing on the output current. The reference signal acquisition unit is connected with the voltage equalizing control circuit 1 and is used for acquiring a constant current control reference signal generated by the voltage equalizing control circuit 1 and outputting the constant current control reference signal to the current compensation unit. Alternatively, the reference signal collecting unit may be configured to directly output the constant current control reference signal to the current compensating unit, or may be configured to process the constant current control reference signal and then output the processed constant current control reference signal to the current compensating unit, for example, to perform filtering processing or performing arithmetic processing on the constant current control reference signal. The current compensation unit is respectively connected with the reference signal acquisition unit and the current acquisition unit and is used for compensating output current information transmitted from the current acquisition unit according to the constant current control reference signal transmitted from the reference signal acquisition unit to obtain current compensation information and outputting the current compensation information to the control unit. The control unit processes the current compensation information to obtain a control signal, outputs the control signal to the value constant current module, controls the constant current module to output constant current, and controls the constant current module to output voltage corresponding to the reference voltage information.
In some embodiments, the current acquisition unit may be a fifth operational amplifier U5. The first input terminal of the fifth operational amplifier U5 is connected with the first circuit output terminal of the constant current module through a resistor R10, and is connected with the output terminal of the fifth operational amplifier U5 through a resistor R11 and a fifth capacitor which are connected in parallel. The second output end of the fifth operational amplifier U5 is connected with the second current output end of the constant current module through a resistor R12 and grounded through a resistor R13 and a sixth capacitor which are connected in parallel. The output end of the fifth operational amplifier U5 is connected with the current compensation unit. The fifth operational amplifier U5 is configured to perform a second proportion operation on the output current information of the constant current module, obtain second current information, and output the second current information to the current compensation unit.
In some embodiments, the reference signal acquisition unit may be a sixth operational amplifier U6. The first input terminal of the sixth operational amplifier U6 is connected to the voltage equalizing control circuit 1 through a resistor R14. Optionally, the first input of the sixth operational amplifier U6 is connected to the output of the fourth operational amplifier U4 through a resistor R14. The first input terminal of the sixth operational amplifier U6 is further connected to the output terminal of the sixth operational amplifier U6 through a resistor R15 and a seventh capacitor connected in parallel. The second input of the sixth operational amplifier U6 is grounded through a resistor R16. The output end of the sixth operational amplifier U6 is connected with the current compensation unit through a resistor R16. The sixth operational amplifier U6 is configured to perform a first proportional operation on the constant current control reference signal to obtain first current information, and output the first current information to the current compensation unit.
In some embodiments, the current compensation unit may be a seventh operational amplifier. The first input end of the seventh operational amplifier is connected with the output end of the fifth operational amplifier U5 through a resistor R17, is connected with the output end of the seventh operational amplifier through an eighth capacitor, and is also connected with the output end of the seventh operational amplifier through a resistor R18 and a ninth capacitor which are connected in series. The second input of the seventh operational amplifier is connected to the output of the sixth operational amplifier U6 via a resistor R19. The output end of the seventh operational amplifier is connected with the control unit. The seventh operational amplifier performs compensation operation on the first current information and the second current information to obtain current compensation information, and outputs the current compensation information to the control unit.
In some embodiments, the control unit may be a control chip capable of implementing output control. The control chip modulates the current compensation information to obtain a control signal, and outputs the control signal to the constant current module. The control signal may be an analog control signal or a digital control signal. Optionally, the control chip performs pulse width modulation according to the current compensation information to obtain a duty ratio signal for controlling the output current and the output voltage of the constant current module.
The embodiment of the invention also provides a constant current output power supply system which comprises a plurality of constant current modules connected in series and a plurality of constant current module series output voltage equalizing control circuits 1 corresponding to the constant current modules one by one. The constant current module serial output voltage equalizing control circuit 1 is the control circuit provided by any one of the embodiments.
In some embodiments, as shown in fig. 3, the present embodiment is described by taking three constant current modules as an example of serial output, but the present invention is not limited to the case where three constant current modules are connected in series. The embodiment comprises a first constant current module, a second constant current module and a third constant current module. Each module is provided with a corresponding control circuit, the first constant current module corresponds to the first control circuit, the second constant current module corresponds to the second control circuit, and the third constant current module corresponds to the third control circuit. The output ends of the second operational amplifiers U2 corresponding to the control circuits are connected together through voltage equalizing buses. If the output voltages of the three constant current modules are different, taking the example that the output voltage of the first constant current module is larger than the output voltage of the second constant current module, and the output voltage of the second constant current module is larger than the output voltage of the third constant current module, the voltage equalizing control circuit of the first control circuit outputs the highest voltage value to the voltage equalizing bus. Therefore, the second voltage-equalizing control circuit and the third voltage-equalizing control circuit detect the reference voltage, and the second voltage-equalizing compensation unit and the third voltage-equalizing compensation unit respectively compensate the reference current information, that is, the output of the transconductance arithmetic unit of the second voltage-equalizing compensation unit and the transconductance arithmetic unit of the third voltage-equalizing compensation unit is increased, so that the current value corresponding to the constant current control reference information received by the corresponding constant current control circuit 2 is increased, and the control signal with increased duty ratio is obtained when the corresponding constant current control circuit of the second constant current module and the corresponding constant current control circuit of the third constant current module respectively modulates the control signal of the received constant current control reference information. And because the three constant current modules are connected in series, the output current of each constant current module is the same, and at the moment, the output current of the second constant current module and the output current of the third constant current module are constantly equal to the output circuit of the first constant current module, so that the increase of the duty ratio of the second constant current module and the duty ratio of the third constant current module can lead the respective output voltage value to rise, and when the output voltage values of the three constant current modules are equal, the voltage difference does not exist on the output of the voltage-sharing bus by each voltage-sharing control circuit, and the compensation of the voltage-sharing compensation unit corresponding to each constant current module to the reference current is zero, so that the voltage-sharing output of each constant current module is kept.
In one embodiment, the number of series of constant current modules can be obtained by the following expression:
Wherein, N is the serial number of the constant current modules, R D2 is the resistance value of the second grounding resistor, I min is the minimum current of the voltage-sharing bus, and V max is the maximum voltage on the voltage-sharing bus.
As shown in fig. 5, the embodiment of the invention further provides a method for controlling voltage equalizing output of the series connection of the constant current modules, which is applied to controlling any one of the series connection of the constant current modules. The method comprises the following steps:
Step S100, obtaining reference voltage information, output voltage information of a constant current module to be controlled and output current information of the constant current module to be controlled.
The reference voltage information may be any information capable of representing a target output voltage of the control constant current module. For example, the voltage value of the target voltage finally output by the constant current module can be controlled, or other electric signals which can represent the voltage value can be used. The output voltage information of the constant current module to be controlled can be the actual output voltage value of the constant current module, or can be other electrical information which can reflect the actual output voltage of the constant current module, such as a voltage value which is filtered and amplified or attenuated according to a preset coefficient, or a current value, etc. The output current information of the constant current module to be controlled can be the actual output current value of the constant current module, or other electrical information which can reflect the actual output current of the constant current module, such as a voltage value which is filtered and amplified or attenuated according to a preset coefficient, or a current value, etc.
Step S200, a constant current control reference signal is obtained according to the reference voltage information and the output voltage information.
The constant current control reference signal is used for providing reference value information for controlling output parameters of the constant current module. The output parameters of the constant current module include output voltage and output current. The constant current control reference signal can be obtained according to a set operation method of the reference voltage, for example, can be obtained through analog logic circuit operation, or can be obtained through computer software algorithm calculation.
And step S300, a control signal is sent to the constant current module according to the output current information and the constant current control reference signal, wherein the control signal is used for controlling the constant current module to output constant current and outputting voltage matched with the reference voltage information.
The control signal can be obtained by performing software calculation on the output current information and the constant current control reference signal, or can be obtained by performing operation through an analog logic circuit. The control signal may be an analog control signal or a digital control signal, so long as the constant current module can be controlled to output a constant current and output a voltage matched with the reference voltage.
According to the constant current module series output voltage equalizing control method provided by the embodiment of the invention, the control signals capable of controlling the output current and the output voltage of the series constant current module are obtained by acquiring the reference voltage information, the output voltage information and the output current information, and the output parameters of the constant current module are controlled. And when any one constant current module fails, the rest normal constant current modules can be selected for voltage equalizing control.
As shown in fig. 6, in one embodiment, the process of acquiring the reference voltage information includes the steps of:
Step S110, voltage proportion operation is carried out on output voltage information corresponding to the constant current module to be controlled, and first voltage information is obtained.
And performing voltage proportion operation on output voltage information corresponding to the constant current module to be controlled so as to perform proper attenuation or filtering and obtain first voltage value information suitable for performing next operation. The first voltage value information may be a specific voltage value, or may be other electrical information, such as current information or power information, which can represent a reference voltage value. The first voltage information of the constant current module to be controlled is used for showing the output voltage of the constant current module to be controlled.
Step S111, obtaining first voltage information corresponding to other constant current modules.
The control method of the embodiment performs voltage equalizing control on the output voltages of the plurality of constant current modules connected in series, so that besides the constant current module to be controlled, other constant current modules connected in series with the constant current module to be controlled exist. And the first voltage information corresponding to the other constant current modules, namely the electric information corresponding to the first voltage information of the constant current module to be controlled. For example, the first voltage information of the constant current module to be controlled is the actual specific output voltage of the constant current module, and the first voltage information corresponding to the constant current module is also the output voltage corresponding to other constant current modules one by one. For another example, the first voltage information of the constant current module to be controlled is voltage information obtained by processing the actual output voltage of the constant current module according to a certain coefficient, and the first voltage information corresponding to other constant current modules is also obtained by processing the actual output voltage of the other constant current modules according to a certain coefficient.
Step S112, selecting the first voltage information corresponding to the maximum voltage value from the first voltage information and determining the first voltage information as the reference voltage information. In this step, it is necessary to select each piece of the obtained first voltage information. There are many methods of selection, for example, if the first voltage information is a specific voltage value, comparison may be directly performed, and the first voltage information representing the maximum value may be selected as the reference voltage information. If the first voltage information is the processed voltage information, the first voltage information representing the maximum output voltage value may be found by the algorithm processing, and the first voltage information may be determined as the reference voltage information.
As shown in fig. 7, in one embodiment, a process of obtaining a constant current control reference signal according to reference voltage information and output voltage information includes the steps of:
step S210, a first compensation operation is performed on the reference voltage information and the first voltage information to obtain first compensation information.
The compensation operation is performed on the reference voltage information and the first voltage information, and the compensation operation is performed on the first voltage information according to the reference voltage information. The reference voltage is determined by selecting one of the first voltage information corresponding to each of the plurality of series-connected constant current modules as the reference voltage, so that the voltage value corresponding to the first voltage information corresponding to each constant current module is not larger than the reference voltage. The reference voltage represents a target value for controlling the output voltage of the constant current module, so that the difference between the first voltage information corresponding to the constant current module to be controlled and the reference voltage information represents the voltage difference required to be regulated by the constant current module. The control amount for controlling the voltage output of the constant current module can be obtained from the difference between the first voltage information and the reference voltage information. The control amount may be voltage information or current information. In one embodiment, the first voltage information is compensated according to the reference voltage information, so as to obtain first compensation information for representing the voltage output control quantity of the control constant current module. The compensation method can be various, and the voltage difference value can be obtained by simply subtracting the voltage values corresponding to the reference voltage information and the first voltage information, and then the voltage difference value is converted into current information, namely the first compensation information. The reference voltage information and the first voltage information may be superimposed to obtain a superimposed signal, and the first compensation information may be correspondingly output according to a predetermined method.
Step S211, a constant current control reference signal is obtained according to the first compensation information.
The constant current control reference signal is used for providing reference value information for controlling the output of the constant current module. And processing the first compensation information to obtain a constant current control reference signal output by the corresponding control constant current module. For example, the constant current control reference signal may be obtained by compensating with the first compensation information based on a certain preset reference signal. The constant current control reference signal can also be obtained by converting the type of the first compensation information based on the processing of the first compensation information.
As shown in fig. 8, in one embodiment, a process of obtaining a constant current control reference signal according to first compensation information includes the steps of:
step S221, acquiring reference current information.
The reference current information provides a base for a processing process of obtaining the constant current control reference signal according to the first compensation information. The reference current information may be any information indicating a basis of a reference. For example, the reference current information may be a current having a specific magnitude or a voltage capable of indicating the reference current value, as long as the compensation process is performed according to a set reference value capable of being recognized as a compensation process.
Step S222, the reference current information and the first compensation information are subjected to superposition operation to obtain a constant current control reference signal. The superposition operation of the reference current information and the first compensation information may be performed by simply adding the current value indicated by the reference current information and the current value indicated by the first compensation information, or by performing inversion processing on one of them and then adding them, or by performing inversion processing on both them and then adding them. The constant current control reference signal can be set according to actual design requirements, and the purpose is to compensate the reference current information according to the first compensation information, so that the constant current control reference signal is obtained.
As shown in fig. 9, in one embodiment, a process of sending a control signal to a constant current module according to output current information and a constant current control reference signal includes the steps of:
in step S231, a first proportional operation is performed on the constant current control reference signal to obtain first current information.
And performing first proportional operation on the constant current control reference signal, and performing proper gain adjustment to obtain first current information suitable for operation. The first current value information is not limited to the current, but may be other electrical information that can embody constant current control reference information, such as voltage information, current information, and the like.
Step S232, performing a second proportional operation on the output current information to obtain second current information.
And performing second proportion operation on the output current information, performing proper gain adjustment and filtering interference to obtain second current information suitable for performing next operation. The second current information may be a specific current value, or may be other electrical information, such as voltage information or power information, which can represent an output current value.
Step S233, performing a second compensation operation on the first current information and the second current information to obtain current compensation information. And compensating the output current information according to the constant current control reference signal, namely compensating the second current information according to the first current information to obtain current compensation information. There are various ways of compensation, such as simple signal superposition, addition of current values indicated by the electrical information, and the like.
Step S234, a control signal is obtained according to the current compensation information.
The control signal can be obtained by processing the current compensation information. The control signal may be various, for example, an analog control signal or a digital control signal. The output current and the output voltage of the constant current module can be controlled only by matching with the constant current module.
In one embodiment, the process of obtaining the control signal according to the current compensation information includes the steps of:
and step S240, pulse width modulation is carried out on the current compensation information, and a duty ratio signal for controlling the output voltage of the constant current module is obtained.
The duty ratio signal is used for controlling the on-off time of the switching device of the constant current module, and the on-off time is changed by the change of the duty ratio, so that the change of the output voltage of the constant current module is influenced. Since the constant current modules are connected in series, the current is constant, and only the output voltage of the constant current module to be controlled is changed.
In some of these embodiments, the first compensation operation may be PID (Proportion Integration Differentiation, proportional-integral-derivative) compensation. Alternatively, the second compensation operation may also be PID compensation. Alternatively, the first compensation operation and the second compensation operation may be control operations of a multi-Pole multi-Zero digital controller such as 3P3Z (3-Pole 3Zero, 3 Pole 3 Zero), 2P3Z (2-Pole 3Zero,2 Pole 3 Zero), and the like.
As shown in fig. 10, the embodiment of the present invention further provides a constant current module series output voltage equalizing control device, including:
The acquisition module 10 is used for acquiring reference voltage information, output voltage information of the constant current module to be controlled and output current information of the constant current module;
The operation module 20 is used for obtaining a constant current control reference signal according to the reference voltage information and the output voltage information;
the control output module 30 is configured to send a control signal to the constant current module according to the output current information and the constant current control reference signal, where the control signal is used to control the constant current module to output a constant current and output a voltage matched with the reference voltage information.
The functions of the above modules correspond to the steps in the embodiment of the constant current module serial output voltage equalizing control method, and are not described herein.
The embodiment of the invention also provides a chip, on which a computer program is stored, which when being executed by a processor, implements the steps of any of the method embodiments described above. Specifically, the steps described in the embodiments of the method of the present invention are implemented to integrate a circuit into a chip, so that the chip can operate the constant current module series output voltage equalizing control method described in the embodiments of the method of the present invention.
In each embodiment of the chip, the integrated control method in the chip not only can improve the calculation precision and the convergence speed, but also can reduce the realization cost and improve the control efficiency.
As shown in fig. 11, the embodiment of the invention further provides a method for determining component parameters of a voltage equalizing control circuit, wherein the voltage equalizing control circuit comprises a first operational amplifier U1, a second operational amplifier U2, a third operational amplifier U3, a fourth operational amplifier U4, a transconductance operational amplifier gm1 and peripheral connection circuits of the operational amplifiers. The method for determining the parameters of the components of the equalizing control circuit comprises the following steps:
Step S400, obtaining a pole value of the constant current control circuit, a zero value of the constant current control circuit, gain at a low frequency of the constant current control circuit and maximum output voltage of the constant current control circuit, and simulating a transfer function of the constant current control circuit to obtain a simulation curve.
Wherein, zero point represents the signal of a certain frequency, and the output response of the constant current control circuit is zero. The pole represents the signal of a certain frequency output by the constant current control circuit to be infinity. The pole value and the zero value can be obtained by solving and calculating the expression of the transfer function of the constant current control circuit. The constant current control circuit can also be obtained by measuring the phase analyzer. The gain at low frequency can determine the specific position of the transfer function curve of the constant current control circuit in the baud chart. The transfer function of the constant current control circuit is simulated according to the zero value of the constant current control circuit, the pole value of the constant current control circuit and the gain of the low frequency part of the constant current control circuit, so as to obtain a simulation curve corresponding to the transfer function of the constant current control circuit.
And S500, compensating the analog curve, and determining a compensation zero value, a compensation pole value and the crossing frequency of the constant current control circuit.
And compensating the analog curve, and compensating the zero value of the constant current control circuit and the pole value of the constant current control circuit by using a compensation unit, so that the analog curve is highly matched with the transfer function curve of the constant current control circuit, and the crossing frequency of the constant current control circuit, the zero value of the compensation unit, namely the compensation zero value, and the pole value of the compensation unit, namely the compensation pole value, are determined.
And step S600, determining the resistance values of the resistor R1 and the resistor R2 and the capacitance value of the first capacitor according to the crossing frequency of the constant current control circuit and the maximum output voltage of the constant current module, and determining the capacitance values of the third capacitor and the fourth capacitor and the resistance value of the resistor R5 according to the compensation zero value and the compensation pole value.
The crossing frequency of the voltage equalizing control circuit can be determined according to the crossing frequency of the constant current control circuit, and the gain of the differential amplifying circuit can be determined by combining the maximum output voltage of the constant current control circuit, so that the resistor R1, the resistor R2 and the first capacitor are determined. And according to the compensation zero value and the compensation pole value, the capacitance values of the third capacitor and the fourth capacitor and the resistance value of the resistor R5 can be calculated by combining a specific circuit.
As shown in fig. 12, in one embodiment, a process of obtaining a pole value of the constant current control circuit, a zero value of the constant current control circuit 2, and a gain at a low frequency of the constant current control circuit includes the steps of:
Step S410, a Bode graph curve of the constant current control circuit on the phase analyzer is obtained.
The baud graph curve of the constant current control circuit can be determined according to the transfer function of the constant current control circuit. Of course, the baud graph curve can be obtained relatively quickly by measuring the constant current module through the phase analyzer.
Step S411, obtaining a pole value of the constant current control circuit, a zero value of the constant current control circuit and a gain at a low frequency of the constant current control circuit according to the Bode graph curve.
The baud graph is a semilogarithmic graph of transfer function versus frequency of a linear time-invariant system, and the frequency response of the system can be seen by using the baud graph. From the baud diagram of the constant current module, the pole value of the constant current control circuit 2, the zero value of the constant current control circuit 2, and the gain at the low frequency of the constant current control circuit 2 can be determined.
In one embodiment, the process of determining the capacitance values of the third capacitor, the fourth capacitor and the resistance value of the resistor R5 according to the compensation zero value and the compensation pole value is obtained by the following expression:
Wherein fz is a compensation zero value, fp is a compensation pole value; c 3 is the capacitance of the third capacitor, C 4 is the capacitance of the fourth capacitor, and R 5 is the resistance of the resistor R5.
After the compensation zero value and the compensation pole value are obtained through compensation, a third capacitor, a fourth capacitor and a resistor R5 can be calculated by combining calculation expressions of the zero value and the pole value of a specific circuit of the compensation unit. Specifically, in the present embodiment, the description is made in connection with the circuit configuration shown in fig. 3. The analog curve is compensated, and the analog curve can be compensated by using a transconductance operator gm 1. The transfer function G comp of the compensation circuit formed by the transconductance operator gm1 is:
where g m is transconductance, s is Laplace complex variable, C 3 is capacitance of capacitor C 3, C 4 is capacitance of capacitor C 4, and R 5 is resistance of resistor R 5. From expression (1), the zero and the pole of the transfer function G comp can be obtained as
Where f comp-p0 is the first pole of transfer function G comp, f comp-p1 is the second pole of transfer function G comp, and f comp-z is the zero of transfer function G comp. Wherein the expression (3) and the expression (4) are combined, the pole of the simulation curve is compensated by the zero point of the transfer function G comp, and the zero point of the simulation curve is compensated by the pole of the transfer function G comp, so that the simulation curve is highly matched with the transfer function curve of the constant current control circuit 2
fcomp-p1＝fz (5)
fcomp-z＝fp (6)
Combining expression (3), expression (4), expression (5) and expression (6) to obtainAndThus, the relation among the capacitor C 3, the capacitor C 4 and the resistor R 5 is obtained, and the circuit parameters are determined.
In one embodiment, the process of determining the resistance value of the resistor R1 and the resistor R2 and the capacitance value of the first capacitor by the crossing frequency of the constant current control circuit and the maximum output voltage of the constant current module is obtained by the following expression:
Wherein f cross is the crossing frequency, C 1 is the capacitance value of the first capacitor, V max is the maximum output voltage of the constant current module, V is the maximum output voltage of the first operational amplifier U1 in the constant current module, R 1 is the resistance value of the resistor R1, and R 2 is the resistance value of the resistor R2.
Generally, the crossing frequency of the equalizing control circuit is at least less than 1/6 of the crossing frequency of the constant current control circuit, and can be selected to be 1/10, and the crossing frequency of the constant current control circuit is f cross, so that the bandwidth of the equalizing ring is f cross/10, and therefore, in order to ensure that the phase lag of differential filtering does not influence the loop stability, the pole f dif of the differential filtering is selected to be 20 times f cross, the maximum voltage output by the constant current module is considered, and a proper attenuation value is selected to ensure that the output of the operating voltage is in a linear output range. The maximum output voltage of the constant current module is V max, and optionally, if the maximum output voltage of the first operational amplifier U1 is set to 9V, the attenuation multiple k diffop＝V/Vmax＝9/Vmax is selected, so that parameters of the differential attenuation circuit can be obtained. Knowing that the pole of the transfer function of the constant current module is fp and the zero is fz, the zero of the compensator is set to: f comp_z =fp, the pole of the compensator is set to: f comp_p1 =fz, and the corresponding resistance and capacitance of the compensator are calculated according to the f comp_p1 =fz.
Wherein,
The embodiment of the invention also provides a computing device for the component parameters of the voltage equalizing control circuit, which comprises:
the simulation module is used for obtaining the pole value of the constant current control circuit, the zero value of the constant current control circuit, the gain at the low frequency of the constant current control circuit and the maximum output voltage of the constant current control circuit, and simulating the transfer function of the constant current control circuit to obtain a simulation curve.
And the compensation module is used for compensating the analog curve and determining a compensation zero value, a compensation pole value and the crossing frequency of the constant current control circuit 2.
And the calculation module is used for determining the resistance values of the resistor R1 and the resistor R2 and the capacitance value of the first capacitor according to the crossing frequency of the constant current control circuit and the maximum output voltage of the constant current module, and determining the capacitance values of the third capacitor and the fourth capacitor and the resistance value of the resistor R5 according to the compensation zero value and the compensation pole value.
The calculating module comprises a first calculating module and a second calculating module, wherein the first calculating module is used for calculating capacitance values of the third capacitor and the fourth capacitor and resistance values of the resistor R5 according to the expression.
The calculation module further comprises a second calculation module for calculating the resistance values of the resistor R1 and the resistor R2 and the capacitance value of the first capacitor according to the expression
The functions of the above modules correspond to the steps in the embodiment of the constant current module serial output voltage equalizing control method, and are not described herein.
The embodiment of the invention also provides a storage medium which stores a computer program, and the computer program realizes the steps of each embodiment of the method for determining the parameters of the components of the equalizing control circuit when being executed by a processor. Those skilled in the art will appreciate that the implementation of all or part of the above-described embodiments of the method for determining parameters of components of a voltage equalizing control circuit may be implemented by a computer program for instructing relevant hardware, and the program may be stored in a computer readable storage medium, where the program may include the steps of the embodiments of the above-described methods when executed. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), or a random access Memory (Random Access Memory: RAM). The computer readable storage medium is used for storing a program (instruction) of the voltage equalizing control circuit component parameter determining method provided by the embodiment of the invention, wherein the program can be executed to execute the steps of the voltage equalizing control circuit component parameter determining method provided by the embodiment of the invention, and the method has the corresponding beneficial effects of the executing method. Reference may be made to the description of the above method embodiments, and no further description is given here.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.

Claims (12)

1. The constant current module series output voltage equalizing control circuit is characterized by comprising a voltage equalizing control circuit and a constant current control circuit which are all corresponding to the constant current module;
the voltage equalizing control circuit is used for acquiring reference voltage information and output voltage information of the constant current module, and outputting a constant current control reference signal to the constant current control circuit according to the output voltage information and the reference voltage information;
The constant current control circuit is used for acquiring the constant current control reference signal and the output current information of the constant current module, sending a control signal to the constant current module according to the constant current control reference signal and the output current information, and controlling the constant current module to output constant current and output voltage matched with the reference voltage information;
The voltage equalizing control circuit comprises a voltage acquisition unit, a voltage equalizing acquisition unit and a voltage equalizing compensation unit which correspond to each other;
The voltage acquisition unit is used for acquiring output voltage information of the corresponding constant current module and outputting the output voltage information to the corresponding voltage equalizing acquisition unit; the voltage-sharing bus is also used for outputting the output voltage information to the voltage acquisition units corresponding to other constant current modules;
The voltage-sharing acquisition unit is used for acquiring output voltage information of the corresponding voltage acquisition unit and voltage information of the voltage-sharing bus, determining reference voltage information according to the output voltage information and the voltage information of the bus, and outputting the reference voltage information to the voltage-sharing compensation unit;
The voltage equalizing compensation unit is used for acquiring reference current information, the output voltage information and the reference voltage information, compensating the reference current information according to the output voltage information and the reference voltage information to obtain a constant current control reference signal, and outputting the constant current control reference signal to the constant current control circuit;
the voltage acquisition unit comprises a differential amplifying circuit and a first voltage follower circuit;
the differential amplifying circuit is used for acquiring output voltage information of the corresponding constant current module, performing differential operation on the output voltage information to obtain first voltage information, and outputting the first voltage information to the first voltage follower circuit;
The first voltage follower circuit is used for acquiring the first voltage information and outputting the first voltage information to the voltage equalizing acquisition unit and the voltage equalizing bus;
The voltage equalizing acquisition unit comprises a second voltage follower circuit;
the second voltage follower circuit is used for acquiring the first voltage information and the voltage information of the voltage-sharing bus, determining the electric information corresponding to the maximum value as reference voltage information according to the first voltage information and the voltage information of the voltage-sharing bus, and outputting the reference voltage information to the voltage-sharing compensation unit;
The voltage equalizing compensation unit comprises an addition operation circuit and a transconductance operation unit;
The transconductance arithmetic unit is used for obtaining the first voltage information and the reference voltage information, performing transconductance operation on the first voltage information and the reference voltage information to obtain current compensation information, and outputting the current compensation information to the addition operation circuit;
the addition circuit is used for obtaining the reference current information and the current compensation information, carrying out addition operation on the reference current information and the current compensation information to obtain a constant current control reference signal, and outputting the constant current control reference signal to the constant current control circuit.
2. The constant current module series output voltage equalizing control circuit according to claim 1, wherein the differential amplifying circuit comprises a first operational amplifier, and the first voltage follower circuit comprises a second operational amplifier;
The first input end of the first operational amplifier is connected with the first voltage input end of the constant current module through a resistor R1, and is connected with the output end of the first operational amplifier through a resistor R2 and a first capacitor which are connected in parallel; the second input end of the first operational amplifier is connected with the second output end of the constant current module through a resistor R3 and grounded through a resistor R4 and a second capacitor which are connected in parallel; the output end of the first operational amplifier is connected with the second operational amplifier;
the first input end of the second operational amplifier is connected with the output end of the second operational amplifier, the second input end of the second operational amplifier is connected with the output end of the first operational amplifier, and the output end of the second operational amplifier is connected with the input end of the second voltage follower circuit and is used for being connected with the voltage equalizing bus.
3. The constant current module series output voltage equalizing control circuit according to claim 2, wherein the second voltage follower circuit comprises a third operational amplifier; the first input end of the third operational amplifier is connected with the output end of the third operational amplifier, and the second input end of the third operational amplifier is used for being respectively connected with the output end of the second operational amplifier and the voltage equalizing bus.
4. The constant current module series output voltage equalizing control circuit according to claim 3, wherein,
The first input end of the transconductance arithmetic unit is connected with the output end of the third operational amplifier, the second input end of the transconductance arithmetic unit is connected with the output end of the first operational amplifier, and the output end of the transconductance arithmetic unit is connected with the addition circuit and grounded through a third capacitor and grounded through a resistor R5 and a fourth capacitor which are connected in series.
5. The constant current module series output voltage equalizing control circuit according to claim 4, wherein said adding operation circuit comprises a fourth operation amplifier, a first input end of said fourth operation amplifier is used for obtaining said reference current information and is connected with an output end of said transconductance operation device; the second input end of the fourth operational amplifier is connected with the output end of the fourth operational amplifier through a resistor R6 and is grounded through a resistor R7; and the output end of the fourth operational amplifier is used for being connected with the constant current control circuit.
6. The constant current output power supply system comprises a plurality of constant current modules connected in series and a plurality of constant current module series output voltage-sharing control circuits corresponding to the constant current modules one by one, and is characterized in that the constant current module series output voltage-sharing control circuit is the constant current module series output voltage-sharing control circuit according to any one of claims 1-5.
7. The method for determining component parameters of the voltage equalizing control circuit is characterized in that the method is applied to the constant current module series output voltage equalizing control circuit as claimed in any one of claims 1 to 5, and comprises the following steps:
Obtaining a pole value of the constant current control circuit, a zero value of the constant current control circuit, gain at a low frequency of the constant current control circuit and maximum output voltage of the constant current control circuit, and simulating a transfer function of the constant current control circuit to obtain a simulation curve;
Compensating the analog curve, and determining a compensation zero value, a compensation pole value and the crossing frequency of the constant current control circuit;
And determining the resistance values of the resistor R1 and the resistor R2 and the capacitance value of the first capacitor according to the crossing frequency of the constant current control circuit and the maximum output voltage of the constant current module, and determining the capacitance values of the third capacitor and the fourth capacitor and the resistance value of the resistor R5 according to the compensation zero value and the compensation pole value.
8. The method for determining component parameters of a voltage equalizing control circuit according to claim 7, wherein the process of obtaining the pole value of the constant current control circuit, the zero value of the constant current control circuit, and the gain at the low frequency of the constant current control circuit comprises the steps of:
acquiring a baud graph curve of a constant current control circuit on a phase analyzer;
and obtaining a pole value of the constant current control circuit, a zero value of the constant current control circuit and a gain of the constant current control circuit at a low frequency according to the Bode graph curve.
9. The method for determining parameters of components of a voltage equalizing control circuit according to claim 8, wherein the process of determining the capacitance values of the third capacitor, the fourth capacitor and the resistance value of the resistor R5 according to the compensation zero value and the compensation pole value is obtained by the following expression:
Wherein fz is the zero value and fp is the pole value; c 3 is the capacitance value of the third capacitor, C 4 is the capacitance value of the fourth capacitor, and R 5 is the resistance value of the fifth resistor.
10. The method for determining component parameters of a voltage equalizing control circuit according to claim 9, wherein the process of determining the resistance values of the resistor R1 and the resistor R2 and the capacitance value of the first capacitor according to the crossing frequency of the constant current control circuit and the maximum output voltage of the constant current module is obtained by the following expression:
Wherein f cross is the crossing frequency, C 1 is the capacitance value of the first capacitor, V max is the maximum output voltage, V is the maximum voltage of the constant current module, R 1 is the capacitance value of the resistor R1, and R 2 is the resistance value of the resistor R2.
11. A calculation device for component parameters of a voltage equalizing control circuit, wherein the device is applied to the constant current module series output voltage equalizing control circuit according to any one of claims 1-5, and the device comprises:
the simulation module is used for obtaining the pole value of the constant current control circuit, the zero value of the constant current control circuit, the gain at the low frequency of the constant current control circuit and the maximum output voltage of the constant current control circuit, and simulating the transfer function of the constant current control circuit to obtain a simulation curve;
The compensation module is used for compensating the analog curve and determining a compensation zero value, a compensation pole value and the crossing frequency of the constant current control circuit;
And the calculation module is used for determining the resistance values of the resistor R1 and the resistor R2 and the capacitance value of the first capacitor according to the crossing frequency of the constant current control circuit and the maximum output voltage of the constant current module, and determining the capacitance values of the third capacitor and the fourth capacitor and the resistance value of the resistor R5 according to the compensation zero value and the compensation pole value.
12. A storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the method of any of claims 7 to 10.
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