CN116204034A - Dynamic adjustment system and method for excitation voltage of power amplifier source - Google Patents
Dynamic adjustment system and method for excitation voltage of power amplifier source Download PDFInfo
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- CN116204034A CN116204034A CN202310472776.2A CN202310472776A CN116204034A CN 116204034 A CN116204034 A CN 116204034A CN 202310472776 A CN202310472776 A CN 202310472776A CN 116204034 A CN116204034 A CN 116204034A
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/389—Measuring internal impedance, internal conductance or related variables
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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
- G05F1/561—Voltage to current converters
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Abstract
The invention belongs to the field of battery internal resistance testing, and relates to a dynamic adjustment system and method for excitation voltage of a power amplifier source, wherein in the dynamic adjustment system, a digital control and voltage adjustment circuit is added between the power amplifier source and a battery to be tested, the power amplifier source voltage is dynamically controlled through voltage collection feedback, and the power amplifier source outputs excitation voltage U to the battery to be tested o And excitation current I o The digital control and voltage adjustment circuit is respectively and electrically connected with the power amplification source and the battery to be tested, and is used for controlling the positive excitation voltage V of the power amplification source a+ And a negative excitation voltage V a‑ . In the dynamic adjustment method, the digital control module is used for controlling the excitation voltage U output by the power amplifier source o The power supply voltage V of the input power amplifier source is dynamically controlled in real time through the voltage adjusting module a Is a variation of (c). The output power of the power amplifier source in the invention is dynamically reduced, the power consumption on the internal resistance of the battery is basically unchanged, and the systemThe efficiency is greatly improved, and meanwhile, the system loss is reduced and the reliability is improved.
Description
Technical Field
The invention belongs to the technical field of battery internal resistance testing, and particularly relates to a dynamic adjustment system and method for excitation voltage of a power amplifier source.
Background
IEC61960/62620 stipulates that the internal resistance test of the battery needs to electrify the battery or the battery pack for 1 to 5 seconds by adopting an alternating current constant current injection method, and the frequency is 1.0+/-0.1 kHz; the alternating current constant current source (i.e. power amplifier source) is realized by adopting a linear power amplifier, and high current is required during the test of small internal resistance, so that the increase of the loss of a test system and the reduction of the reliability are brought.
As shown in fig. 1, a schematic diagram of a power amplifier source control system in the prior art for testing the internal resistance of a battery is shown; fig. 2 is a schematic diagram of a power amplifier source control system in the conventional battery internal resistance test. The power amplification source is an AB power amplification source, the power amplification source provides excitation voltage and excitation current to the battery to be tested to test the internal resistance of the battery, and the test system outputs constant alternating current through constant current feedback control.
During the test, the supply voltage V a Comprising a positive excitation voltage V a+ And a negative excitation voltage V a- ，V a+ And V a- The fixed positive and negative voltages are input to the power amplifier source; u (U) o For the excitation voltage applied to the battery; i o For the excitation current applied to the battery; u (U) i Is used for inputting a control signal; u (U) r The constant current feedback signal is the voltage value on the sampling resistor R; u (U) g For a given control signal of the system, U g Is a constant value.
The resistance value of the internal resistance R of the high-capacity battery is very small, so that a high-current alternating-current excitation constant current source (more than A) is required to perform the battery internal resistance test, and the accuracy and precision of signal sampling are ensured. Output power P of power amplifier source a =V a ×I o The exciting current I is required under small internal resistance o Increase of supply voltage V a The output power of the power amplifier source is increased as the output power is unchanged. And power consumption P on internal resistance of battery b =（U o -Ur） 2 /R，P b Is essentially unchanged (according to IEC61960/62620: alternating voltage peaks do not exceed 20mV, typically 7-8 mV). Output power P of power amplifier source a Enlargement, P b Invariable, system efficiency = P b /P a Greatly reduces the lost energy P a -P b The conversion to heat has the consequences of high test system losses and reduced reliability.
In the existing battery internal resistance test process, the power supply voltage V of a power amplifier source a Are all fixed at the excitation current I o Under the condition of constant, the power amplifier source voltage control system is powered onThe consumption is constant; the power amplifier source voltage control system cannot realize dynamic adjustment of power consumption according to different batteries to be tested, so that the power amplifier source voltage control system has large loss and high heat generation, and if physical heat dissipation is carried out only through a radiator or a fan, the problem of overhigh temperature can occur in the process of testing the internal resistance of the battery, and the accuracy and the safety of testing the internal resistance of the battery are affected.
Disclosure of Invention
In order to solve the technical problems, the invention provides a dynamic adjustment system and a dynamic adjustment method for the excitation voltage of a power amplifier source, which can greatly improve the efficiency and the reliability of the system by dynamically controlling the change of the power amplifier source voltage. The technical scheme adopted by the invention is as follows:
dynamic adjustment system of power amplifier source excitation voltage, the emitter of NPN triode V1 is electrically connected with the emitter of PNP triode V2, and positive excitation voltage V is applied to the collector of V1 a+ The collector of V2 is applied with a negative excitation voltage V a- The method comprises the steps of carrying out a first treatment on the surface of the One end of the battery to be tested is electrically connected with the emitters of V1 and V2, the other end of the battery to be tested is connected with one end of the sampling resistor R, and the other end of the sampling resistor R is grounded; one input end of the voltage acquisition module A1 is connected with the battery to be tested and the sampling resistor R, and the other input end of the voltage acquisition module A1 is applied with a desired voltage value U g The output end of A1 and the input control signal U i Are connected; one end of the resistor R1 is connected with the base electrode of the V1, and the other end of the resistor R1 is connected with the collector electrode of the V1; the cathode of the diode D1 is connected with an input control signal Ui, and the anode is connected with the base electrode of the V1; one end of the resistor R2 is connected with the base electrode of the V1, and the other end of the resistor R2 is connected with the collector electrode of the V2; the anode of the diode D2 is connected with an input control signal Ui, and the cathode is connected with the base electrode of the V2; the input end of the digital control and voltage regulation circuit is connected with the battery to be tested and R, A1, and the output end is respectively connected with the collectors of V1 and V2;
the digital control and voltage regulation circuit comprises a digital control module and a voltage regulation module, wherein the digital control module adopts a control chip, and three sub-modules of effective value conversion, set value comparison and step value output are operated in the control chip, and are used for realizing the acquisition of peak voltage Ur on a sampling resistor R as a constant current feedback signal and the setting value of an upper computerCalculating and adjusting the exciting current I output by the power amplifier source according to the calculation result o Thereby controlling the excitation voltage U output by the power amplifier source o The method comprises the steps of carrying out a first treatment on the surface of the The circuit structure of the voltage adjusting module is as follows: one end of the sampling resistor R is grounded, the other end of the sampling resistor R is used as an input of a digital control module, the output of the digital control module is differential, and the positive output end of the sampling resistor R is connected with the forward diode D + Anode of the forward diode D + Cathode and forward resistance R of (2) a+ Connected with forward resistor R a+ Respectively with the other end of the pull-up resistor R up And pull-down resistor R lo Is connected with a pull-up resistor R up The other end of the pull-down resistor R is connected with the positive output end of the power amplifier source lo The other end of the first electrode is grounded; negative output end of digital control module and negative diode D - Cathode of the negative diode D - Anode and negative resistance R of (2) a- Connected with negative resistance R a- Respectively with the other end of the pull-up resistor R up- And pull-down resistor R lo- Is connected with a pull-up resistor R up- The other end of the pull-down resistor R is grounded lo- The other end of the power amplifier is connected with the negative output end of the power amplifier source.
Preferably, the control chip has digital processing and operation functions and adopts FPGA, DSP, ARM or a singlechip.
A dynamic adjustment method for excitation voltage of a power amplifier source, which is applied to the dynamic adjustment system for excitation voltage of the power amplifier source, comprises the following steps:
step 1, collecting peak voltage U on a sampling resistor R through a digital control module r As a constant current feedback signal, the constant current feedback signal is operated with the set value of the upper computer, and the exciting current I output by the power amplifier source is adjusted according to the operation result o Thereby controlling the excitation voltage U output by the power amplifier source o ；
2.1 Forward direction adjustment): step value V f+ Through a forward diode D + And a forward resistor R a+ Generating a forward current I a+ Injected into the feedback network according to the dyvans theorem and ohm's law:
I a+ = I up+ + I lo+
I’ a+ =（V f+ –V d –V fb+ ）/ R a+
I up+ =（V a+ –V fb+ ）/ R up
I lo+ = V fb+ / R lo
wherein V is d For diode forward conduction voltage drop, V fb+ Is V (V) a+ Generating a reference voltage of the circuit, wherein the reference voltage is a constant k; i a+ Is the current defined by the Thevenin current theorem, I' a+ Is the current defined by ohm's theorem, R up 、R lo Representing the resistance of the circuit, I up+ 、I lo+ Representing the branch current value;
2.2 Negative direction adjustment): step value V f- Through negative diode D - And negative resistance R a- Generating a negative current I a- Injected into the feedback network according to the dyvans theorem and ohm's law:
I a- = I up- +I lo-
I’ a- =（V fb- –V d –V f- ）/ R a-
I up- =（V fb- – V a- ）/ R up-
I lo- =（0 -V fb- ）/ R lo-
wherein V is d For diode forward conduction voltage drop, V fb- Is V (V) a- Generating a reference voltage of the circuit, wherein the reference voltage is a constant-k; i a- Is the current defined by the Thevenin current theorem, I' a- Is the current defined by ohm's theorem, R up- 、R lo- Representing the resistance of the circuit, I up- 、I lo- Indicating the branch current value.
Preferably, in step 1:
1.1 Collecting peak voltage U on sampling resistor R in real time r ，U r Is the alternating current flow, controls the collectionThe values in one or more whole periods are converted into effective values V through root mean square extraction rms Conversion relation V 2 rms =（U 2 r1 + U 2 r2 +…+ U 2 rn ) N; wherein U is r1… U rn The peak voltage is acquired in real time on the resistor R;
1.2）V rms comparing with the setting value input by the upper computer to generate an error voltage V err Wherein V is err =V rms - U r The method comprises the steps of carrying out a first treatment on the surface of the If V is err Within the design allowable range DeltaV err In, starting to output successively according to the designed minimum stepping value; if V is err Is not within the design allowable range DeltaV err In, step value output is not carried out;
1.3 Gradually outputting the output stepping value Vf according to the set minimum stepping value to realize successive approximation until the system adjusts to DeltaV err The step output is stopped without being within the design allowable range.
The invention has the beneficial effects that:
the excitation voltage in the invention can be dynamically reduced and adjusted according to different internal resistances of the batteries, so that the output power of the power amplifier source is dynamically reduced. The output power of the power amplifier source is dynamically reduced, the power consumption on the internal resistance of the battery is basically unchanged, the system efficiency is greatly improved, and meanwhile, the system loss is reduced and the reliability is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention, or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It is apparent that the drawings in the following description are specific embodiments of the invention and that other drawings within the scope of the application can be obtained from these drawings by those skilled in the art without inventive effort.
FIG. 1 is a schematic diagram of a power amplifier source control system in the prior art for testing the internal resistance of a battery;
fig. 2 is a diagram of a power amplifier source control system in the prior art for testing the internal resistance of a battery;
fig. 3 is a schematic diagram of a power amplifier source control system during a battery internal resistance test according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a power amplifier source control system during a battery internal resistance test according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a digital control and voltage adjustment circuit according to an embodiment of the invention.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and complete in conjunction with the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the present invention.
Fig. 3 is a schematic diagram of a power amplifier source control system during a battery internal resistance test according to an embodiment of the present invention. A dynamic adjustment system for power amplifier source excitation voltage, comprising: the power amplifier comprises a power amplifier source and a battery to be tested, wherein a digital control and voltage adjustment circuit is added between the power amplifier source and the battery to be tested, and the power amplifier source voltage is dynamically controlled through voltage collection feedback.
Fig. 4 is a schematic diagram of a power amplifier source control system during a battery internal resistance test according to an embodiment of the present invention. In FIG. 4, the battery to be tested is represented by a battery equivalent model, and the power amplifier source outputs an excitation voltage U to the battery to be tested o And excitation current I o The digital control and voltage adjustment circuit is respectively and electrically connected with the power amplification source and the battery to be tested, and is used for controlling the positive excitation voltage V of the power amplification source a+ And a negative excitation voltage V a- . The circuit structure of the dynamic adjustment system of the excitation voltage of the power amplifier source is as follows: the emitter of NPN triode V1 is electrically connected with the emitter of PNP triode V2, and the collector of V1 is applied with positive excitation voltage V a+ The collector of V2 is applied with a negative excitation voltage V a- The method comprises the steps of carrying out a first treatment on the surface of the One end of the battery to be tested is electrically connected with the emitters of V1 and V2, the other end of the battery to be tested is connected with one end of the sampling resistor R, and the other end of the sampling resistor R is grounded; one input end of the voltage acquisition module A1 is connected with the battery to be tested and the sampling resistor R, and the other input end of the voltage acquisition module A1 is applied with a given control signal U of the system g (desired voltage value), output terminal and input control of A1System signal U i Are connected; one end of the resistor R1 is connected with the base electrode of the V1, and the other end of the resistor R1 is connected with the collector electrode of the V1; cathode of diode D1 and input control signal U i The anode is connected with the base electrode of V1; one end of the resistor R2 is connected with the base electrode of the V1, and the other end of the resistor R2 is connected with the collector electrode of the V2; anode of diode D2 and input control signal U i The cathode is connected with the base electrode of V2; the input end of the digital control and voltage regulation circuit is connected with the battery to be tested and R, A1, and the output end is respectively connected with the collectors of V1 and V2. The voltage acquisition module A1 is in the prior art, and an analog circuit (possibly including difference, follow, PID operation and the like) is built to feed back the voltage on R to the input end of the voltage acquisition module A1, so as to adjust the input control signal U in real time i Is a value of (2).
In the embodiment of the invention, a voltage feedback dynamic control link (digital control and voltage regulation circuit) is added in a power amplifier source voltage control system to output an excitation voltage U to a power amplifier source o And carrying out real-time dynamic adjustment. The invention provides a dynamic adjustment system and a method for excitation voltage of a power amplifier source, which are used for collecting a voltage value U on a sampling resistor R in real time r I.e. constant current feedback signal, the added digital control and voltage regulation circuit provides power supply voltage V a And the efficiency of the test system is improved by performing real-time adjustment.
Fig. 5 is a schematic diagram of a digital control and voltage adjustment circuit according to an embodiment of the invention. The digital control and voltage regulation circuit comprises a digital control module and a voltage regulation module.
1. The digital control module part adopts FPGA, DSP, ARM, singlechip and other control chips with digital processing and operation functions, such as: and the STM32F407 processor is used for controlling three sub-modules of effective value conversion, set value comparison and step value output in the chip. The three sub-modules are software functional modules and can be written in C or C++ language, and the three sub-modules run on a control chip hardware platform. The digital control module is used for realizing that the peak voltage Ur on the sampling resistor R is taken as a constant current feedback signal, operating with the set value of the upper computer, and adjusting the excitation output by the power amplifier source according to the operation resultExcitation current I o Thereby controlling the excitation voltage U output by the power amplifier source o 。
2. The voltage adjusting module part is realized by adopting a hardware circuit structure.
One end of the sampling resistor R is grounded, the other end of the sampling resistor R is used as an input of a digital control module, the output of the digital control module is differential, and the positive output end of the sampling resistor R is connected with the forward diode D + Anode of the forward diode D + Cathode and forward resistance R of (2) a+ Connected with forward resistor R a+ Respectively with the other end of the pull-up resistor R up And pull-down resistor R lo Is connected with a pull-up resistor R up The other end of the pull-down resistor R is connected with the positive output end of the power amplifier source lo The other end of the first electrode is grounded; negative output end of digital control module and negative diode D - Cathode of the negative diode D - Anode and negative resistance R of (2) a- Connected with negative resistance R a- Respectively with the other end of the pull-up resistor R up- And pull-down resistor R lo- Is connected with a pull-up resistor R up- The other end of the pull-down resistor R is grounded lo- The other end of the power amplifier is connected with the negative output end of the power amplifier source.
A dynamic adjustment method for excitation voltage of a power amplifier source, which is applied to the dynamic adjustment system for excitation voltage of the power amplifier source, comprises the following steps:
step 1, the method is realized through a digital control module. Collecting peak voltage U on sampling resistor R r As a constant current feedback signal, the constant current feedback signal is operated with the set value of the upper computer, and the exciting current I output by the power amplifier source is adjusted according to the operation result o Thereby controlling the excitation voltage U output by the power amplifier source o 。
1.1 Collecting peak voltage U on sampling resistor R in real time r ，U r Is an alternating current quantity, thus controlling the acquisition of one or more values over a whole period, converted into an effective value V by root mean square extraction rms Conversion relation V 2 rms =（U 2 r1 + U 2 r2 +…+ U 2 rn ) N; wherein U is r1… U rn Is the peak voltage picked up in real time across resistor R.
1.2）V rms Comparing with the setting value input by the upper computer to generate an error voltage V err Wherein V is err =V rms - U r The method comprises the steps of carrying out a first treatment on the surface of the If V is err Within the design allowable range DeltaV err In, starting to output successively according to the designed minimum stepping value; if V is err Is not within the design allowable range DeltaV err And if the step value is not output.
1.3 Outputting step value V f Gradually outputting according to the set minimum stepping value, and realizing successive approximation until the system is regulated to delta V err The step output is stopped without being within the design allowable range.
In FIG. 5, the voltage adjustment module realizes the supply voltage V to the power amplifier source a Real-time adjustment of (forward decrease V) a+ Negative increase in V a- ) The current references the positive direction (left to right, top to bottom); the current references the negative direction (right to left, down to up), the detailed principle is as follows:
2.1 Forward direction adjustment principle): step value V f+ Through a forward diode D + And a forward resistor R a+ Generating a forward current I a+ Injected into the feedback network according to the dyvans theorem and ohm's law:
I a+ = I up+ + I lo+
I’ a+ =（V f+ –V d –V fb+ ）/ R a+
I up+ =（V a+ –V fb+ ）/ R up
I lo+ = V fb+ / R lo
wherein V is d The forward voltage drop of the diode is constant, and the value is changed according to different diode materials; v (V) fb+ Is V (V) a+ Generating a reference voltage of the circuit, wherein the reference voltage is a constant k; the circuit can output positive excitation voltage V from the power amplifier source a+ Realize the adjustment of forward reduction, thereby realizing the forward direction of the systemThe half cycle efficiency is improved. I a+ Is the current defined by the Thevenin current theorem, I' a+ Is the current defined by the ohm's theorem. R is R up 、R lo Representing the resistance of the circuit, I up+ 、I lo+ Indicating the branch current value.
2.2 Negative direction adjustment principle): step value V f- Through negative diode D - And negative resistance R a- Generating a negative current I a- Injected into the feedback network according to the dyvans theorem and ohm's law:
I a- = I up- +I lo-
I’ a- =（V fb- –V d –V f- ）/ R a-
I up- =（V fb- – V a- ）/ R up-
I lo- =（0 -V fb- ）/ R lo-
wherein V is d For diode forward voltage drop, V fb- Is V (V) a- Generating a reference voltage of the circuit, wherein the reference voltage is a constant-k; the circuit can output the negative excitation voltage V from the power amplifier source a- And negative increasing adjustment is realized, so that the negative half cycle efficiency of the system is improved. I a- Is the current defined by the Thevenin current theorem, I' a- Is the current defined by the ohm's theorem. R is R up- 、R lo- Representing the resistance of the circuit, I up- 、I lo- Indicating the branch current value.
In the embodiment of the invention, the output power P of the power amplifier source a =V a ×I o Supply voltage V a And the power amplifier source output power is dynamically reduced according to the dynamic diminishing and adjustment of different internal resistances of the batteries. And power consumption P on internal resistance of battery b =（U o -Ur） 2 R, is also substantially unchanged (according to IEC61960/62620: alternating voltage peak does not exceed 20mV, typically 7-8 mV). Output power P of power amplifier source a Dynamic reduction, P b Invariable, system efficiency = P b /P a Greatly improves, reduces system loss and improves reliability.
In the embodiments of the present invention, technical features that are not described in detail are all existing technologies or conventional technical means, and are not described herein.
Finally, it should be noted that: the above examples are only specific embodiments of the present invention, and are not intended to limit the scope of the present invention. Those skilled in the art will appreciate that: any person skilled in the art may modify or easily conceive of changes to the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention, and are intended to be included in the scope of the present invention.
Claims (4)
1. A dynamic regulation system of power amplifier source excitation voltage is characterized in that an emitter of an NPN triode V1 is electrically connected with an emitter of a PNP triode V2, and a positive excitation voltage V is applied to a collector of the triode V1 a+ The collector of V2 is applied with a negative excitation voltage V a- The method comprises the steps of carrying out a first treatment on the surface of the One end of the battery to be tested is electrically connected with the emitters of V1 and V2, the other end of the battery to be tested is connected with one end of the sampling resistor R, and the other end of the sampling resistor R is grounded; one input end of the voltage acquisition module A1 is connected with the battery to be tested and the sampling resistor R, and the other input end of the voltage acquisition module A1 is applied with a desired voltage value U g The output end of A1 and the input control signal U i Are connected; one end of the resistor R1 is connected with the base electrode of the V1, and the other end of the resistor R1 is connected with the collector electrode of the V1; the cathode of the diode D1 is connected with an input control signal Ui, and the anode is connected with the base electrode of the V1; one end of the resistor R2 is connected with the base electrode of the V1, and the other end of the resistor R2 is connected with the collector electrode of the V2; the anode of the diode D2 is connected with an input control signal Ui, and the cathode is connected with the base electrode of the V2; the input end of the digital control and voltage regulation circuit is connected with the battery to be tested and R, A1, and the output end is respectively connected with the collectors of V1 and V2;
the digital control and voltage regulation circuit comprises a digital control module and a voltage regulation module, wherein the digital control module adoptsThe control chip is used for operating three sub-modules of effective value conversion, set value comparison and stepping value output in the control chip, and is used for realizing the acquisition of peak voltage Ur on the sampling resistor R as a constant current feedback signal, operating with the set value of the upper computer, and adjusting the excitation current I output by the power amplification source according to the operation result o Thereby controlling the excitation voltage U output by the power amplifier source o The method comprises the steps of carrying out a first treatment on the surface of the The circuit structure of the voltage adjusting module is as follows: one end of the sampling resistor R is grounded, the other end of the sampling resistor R is used as an input of a digital control module, the output of the digital control module is differential, and the positive output end of the sampling resistor R is connected with the forward diode D + Anode of the forward diode D + Cathode and forward resistance R of (2) a+ Connected with forward resistor R a+ Respectively with the other end of the pull-up resistor R up And pull-down resistor R lo Is connected with a pull-up resistor R up The other end of the pull-down resistor R is connected with the positive output end of the power amplifier source lo The other end of the first electrode is grounded; negative output end of digital control module and negative diode D - Cathode of the negative diode D - Anode and negative resistance R of (2) a- Connected with negative resistance R a- Respectively with the other end of the pull-up resistor R up- And pull-down resistor R lo- Is connected with a pull-up resistor R up- The other end of the pull-down resistor R is grounded lo- The other end of the power amplifier is connected with the negative output end of the power amplifier source.
2. The system for dynamically adjusting the excitation voltage of a power amplifier according to claim 1, wherein the control chip has digital processing and operation functions and adopts FPGA, DSP, ARM or a single chip microcomputer.
3. A method for dynamically adjusting the excitation voltage of a power amplifier source, which is characterized by applying the dynamic adjustment system for the excitation voltage of the power amplifier source according to claim 1, comprising the following steps:
step 1, collecting peak voltage U on a sampling resistor R through a digital control module r As a constant current feedback signal, the constant current feedback signal is operated with the set value of the upper computer, and the exciting current I output by the power amplifier source is adjusted according to the operation result o Thereby controlling the excitation voltage U output by the power amplifier source o ；
Step 2, dynamically controlling the power supply voltage V of the input power amplifier source in real time through a voltage adjusting module a Is positively reduced by V a+ Negative increase in V a- ；
2.1 Forward direction adjustment): step value V f+ Through a forward diode D + And a forward resistor R a+ Generating a forward current I a+ Injected into the feedback network according to the dyvans theorem and ohm's law:
I a+ = I up+ + I lo+
I’ a+ =（V f+ –V d –V fb+ ）/ R a+
I up+ =（V a+ –V fb+ ）/ R up
I lo+ = V fb+ / R lo
wherein V is d For diode forward conduction voltage drop, V fb+ Is V (V) a+ Generating a reference voltage of the circuit, wherein the reference voltage is a constant k; i a+ Is the current defined by the Thevenin current theorem, I' a+ Is the current defined by ohm's theorem, R up 、R lo Representing the resistance of the circuit, I up+ 、I lo+ Representing the branch current value;
2.2 Negative direction adjustment): step value V f- Through negative diode D - And negative resistance R a- Generating a negative current I a- Injected into the feedback network according to the dyvans theorem and ohm's law:
I a- = I up- +I lo-
I’ a- =（V fb- –V d –V f- ）/ R a-
I up- =（V fb- – V a- ）/ R up-
I lo- =（0 -V fb- ）/ R lo-
wherein V is d For diode forward conduction voltage drop, V fb- Is V (V) a- Generating a reference voltage of the circuit, wherein the reference voltage is a constant-k; i a- Is the current defined by the Thevenin current theorem, I' a- Is the current defined by ohm's theorem, R up- 、R lo- Representing the resistance of the circuit, I up- 、I lo- Indicating the branch current value.
4. The method for dynamically adjusting the excitation voltage of a power amplifier according to claim 3, wherein in step 1:
1.1 Collecting peak voltage U on sampling resistor R in real time r ，U r Is the alternating current quantity, controls and collects one or more values in the whole period, and converts the values into an effective value V through root mean square extraction rms Conversion relation V 2 rms =（U 2 r1 + U 2 r2 +…+ U 2 rn ) N; wherein U is r1… U rn The peak voltage is acquired in real time on the resistor R;
1.2）V rms comparing with the setting value input by the upper computer to generate an error voltage V err Wherein V is err =V rms - U r The method comprises the steps of carrying out a first treatment on the surface of the If V is err Within the design allowable range DeltaV err In, starting to output successively according to the designed minimum stepping value; if V is err Is not within the design allowable range DeltaV err In, step value output is not carried out;
1.3 Gradually outputting the output stepping value Vf according to the set minimum stepping value to realize successive approximation until the system adjusts to DeltaV err The step output is stopped without being within the design allowable range.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310472776.2A CN116204034A (en) | 2023-04-28 | 2023-04-28 | Dynamic adjustment system and method for excitation voltage of power amplifier source |
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| CN202310472776.2A CN116204034A (en) | 2023-04-28 | 2023-04-28 | Dynamic adjustment system and method for excitation voltage of power amplifier source |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08292236A (en) * | 1995-04-21 | 1996-11-05 | Yokogawa Electric Corp | Set value current feed circuit |
| CN206281902U (en) * | 2016-08-31 | 2017-06-27 | 上海电科臻和智能科技有限公司 | A kind of automatic checkout equipment of earth resistance |
| CN210609073U (en) * | 2019-12-30 | 2020-05-22 | Tcl通力电子（惠州）有限公司 | Power supply voltage dynamic adjustment circuit and electronic equipment |
| CN115309228A (en) * | 2022-08-10 | 2022-11-08 | 上海精积微半导体技术有限公司 | Source meter and precision control method thereof |
| CN115825788A (en) * | 2022-12-21 | 2023-03-21 | 广东电网有限责任公司 | Battery measuring system |
-
2023
- 2023-04-28 CN CN202310472776.2A patent/CN116204034A/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08292236A (en) * | 1995-04-21 | 1996-11-05 | Yokogawa Electric Corp | Set value current feed circuit |
| CN206281902U (en) * | 2016-08-31 | 2017-06-27 | 上海电科臻和智能科技有限公司 | A kind of automatic checkout equipment of earth resistance |
| CN210609073U (en) * | 2019-12-30 | 2020-05-22 | Tcl通力电子（惠州）有限公司 | Power supply voltage dynamic adjustment circuit and electronic equipment |
| CN115309228A (en) * | 2022-08-10 | 2022-11-08 | 上海精积微半导体技术有限公司 | Source meter and precision control method thereof |
| CN115825788A (en) * | 2022-12-21 | 2023-03-21 | 广东电网有限责任公司 | Battery measuring system |
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