CN113485503A - Power supply and method for automatically calibrating output value - Google Patents
Power supply and method for automatically calibrating output value Download PDFInfo
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- CN113485503A CN113485503A CN202110753848.1A CN202110753848A CN113485503A CN 113485503 A CN113485503 A CN 113485503A CN 202110753848 A CN202110753848 A CN 202110753848A CN 113485503 A CN113485503 A CN 113485503A
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- power supply
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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
Abstract
The invention discloses a power supply capable of automatically calibrating an output value, which is characterized in that the actual output value of the power supply is detected and compared with a load demand value, and an output reference value in an adjusting module in the power supply is adjusted according to a comparison result, so that the actual output value of the power supply is changed to approach the load demand value. The invention realizes the purpose of further automatically calibrating the output voltage or current of the power supply, so that the power supply meets the high-precision output requirement.
Description
Technical Field
The present invention relates to the field of power supplies, and more particularly, to a method for adjusting the output accuracy of a power supply.
Background
With the development of science and technology, the requirement on the accuracy of the voltage and current output of the electronic power supply is higher and higher. In the prior art, a simple controller is used for outputting a stable reference, and a voltage dividing resistor is used for obtaining required voltage or current. The precision of the currently and generally used controller is about +/-0.5%, the precision of the voltage dividing resistor is mostly about +/-1%, and thus the precision of the output voltage and current is not higher than +/-0.5%, for example, the current lithium battery charger has the requirements on the voltage of 84V +/-0.2V mostly, the precision requirement of +/-0.23%, and the precision requirement cannot be met by the prior art scheme. In the prior art, an adjustable resistor is added in a simple controller or a divider resistor to realize the fine adjustment of output voltage or the resistor. However, the mechanical characteristics of the varistor require manual adjustment, and the performance is unstable due to vibration or the like. Is not suitable for use under the condition of glue pouring.
Disclosure of Invention
The invention provides a power supply capable of automatically calibrating an output value and a control method thereof, and aims to realize calibration of output voltage or current of the power supply.
In order to achieve the purpose, the invention adopts the technical scheme that:
a power supply capable of automatically calibrating an output value comprises a power circuit, a regulating module and a communication module, wherein the output end of the power circuit is connected with a load, the regulating module controls the power circuit and regulates the output value of the power circuit, the communication module collects a first output value and a load demand value which are provided for the load by the power circuit and outputs the first output value and the load demand value to the regulating module, and the regulating module corrects an output reference value and regulates the first output value to approach the load demand value according to the output reference value.
The first output value is a voltage value or a current value.
The adjusting module comprises a driving signal generator, an arithmetic unit and an error adjuster, wherein the error adjuster samples a second output value and an output reference value of the output end of the power circuit to calculate an error signal, the arithmetic unit calculates an adjusting signal, and the driving signal generates a driving signal for controlling a switching device in the power circuit according to the adjusting signal.
The adjusting module uses the difference value between the first output value and the load demand value as the calibration offset of the output reference value, and corrects the output reference value according to the calibration offset.
The regulation module reduces the output reference value when the first output value is greater than the load demand value, and increases the output reference value when the first output value is less than the load demand value.
The load is an electronic load, detects a first output value provided by the power supply, and transmits the first output value to the communication module of the power supply.
The invention also provides a control method of the power supply for automatically calibrating the output value, which comprises the following steps,
setting a load demand value;
detecting a first output value output to a load end by a power supply;
calculating a difference between the first output value and the load demand value as a calibration offset,
the calibration offset is used to correct the output reference value in the power supply control loop,
the first output value of the power supply is adjusted according to the output reference value.
The method for correcting the output reference value comprises single-point difference value calculation correction, two-point linear equation calculation correction or multi-point piecewise curve fitting correction.
In the control method for the power supply capable of automatically calibrating the output value, when the power supply is subjected to factory reset, the output reference value is restored to a value before the output reference value is not calibrated.
In order to make the aforementioned and other features and advantages of the invention more comprehensible, embodiments accompanied with figures are described in detail below.
Drawings
FIG. 1 is a diagram of an embodiment of the present invention.
Fig. 2 is a diagram illustrating an embodiment of controlling the output voltage of the power supply 11 of fig. 1.
Fig. 3 is a diagram illustrating an embodiment of controlling the output voltage of the power supply 11 of fig. 1.
FIG. 4 is a flow chart of the technical solution of the present invention.
Detailed Description
In order to make the purpose and technical solution of the embodiments of the present invention clearer, the technical solution of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without any inventive step, are within the scope of protection of the invention.
The terms "first," "second," "third," and the like (if any) in this description are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the subject matter described herein are, for example, capable of operation in other sequences than those illustrated or otherwise described herein. Further, wherever possible, the same reference numbers are used in the drawings and the description to refer to the same or like parts.
The invention aims to provide a method for automatically adjusting the output precision of a power supply.
As shown in fig. 1, the power source 11 is connected to the load 12 to accomplish the adjustment of the output accuracy of the power source 11. The load 12 is an electronic load in one embodiment, and includes a load module and a communication module (not shown), the load 12 provides a load for the power source 11, and detects the output Vo1 from the power source 11 to the load. The power source 11 comprises a power circuit 111, a regulation module 112 and a communication module 113, wherein an output end of the power circuit 111 is connected with a load 12, the communication module 113 collects an output value Vo1 output by the power circuit 111 to the load 12, the communication module 113 simultaneously collects a load demand value, an output end of the communication module 313 is connected with a correction module 3121, the collected output value Vo1 and the load demand value are output to the regulation module 112, the regulation module obtains a calibration offset according to a difference value between the output value Vo1 and the load demand value, corrects an output reference value by using the calibration offset, outputs a control signal to a switching device in the power circuit 111, and controls the output value Vo2 of the power circuit 111 to change, so that the output value Vo1 approaches the load demand value.
The adjusting module 112, which is a digital control unit in one embodiment, includes: HT66F004RM, the communication module 113 is GPIO communication, UART communication, CAN communication and the like.
Fig. 2 shows an embodiment of the adjusting module 112 in fig. 1, and the adjusting module 212 in fig. 2 includes a corrector 2121, an error adjuster 2122, an operator 2123 and a driving signal generator 2124, which can be implemented by analog circuits, preferably by digital calculation. The corrector 2121 subtracts the output value Vo1 from the load demand value to obtain a calibration offset, corrects the output reference value Vref using the calibration offset, and outputs the output reference value Vref to the error regulator 2122, the error regulator 2122 calculates a difference between the output value Vo2 and the output reference value Vref to obtain an error signal Δ V, the operator 2323 converts the error signal Δ V into a control signal S, the operator 2323 is a proportional-integral regulator or other control method, the driving signal generator 2124 converts the control signal into a driving signal Vd, and the driving signal generator 2124 is, for example, a PWM or SVPWM generator.
As shown in fig. 3, a control manner when the output value is a current is shown, different from fig. 2, in this embodiment, the output current needs to be adjusted, the communication module 313 collects an output current value of the load, and the error regulator 3122 samples a current Io2 at the output end of the power circuit 311.
Fig. 4 is a flow chart of the method for automatically calibrating the output value of the power supply according to the present invention, which includes the following steps:
s41 setting a load demand value;
s42, detecting a first output value from the power supply to the load end;
s43 calculates a difference between the first output value and the load demand value as a calibration offset,
s44 corrects the output reference in the power supply control loop using the calibration offset and adjusts the first output value of the power supply based on the output reference.
The method for correcting the output reference value comprises single-point difference value calculation correction, two-point linear equation calculation correction or multi-point piecewise curve fitting correction.
And when the power supply is subjected to factory reset, the output reference value is restored to the state before the calibration.
The output value of the invention can be output voltage and output current, the output value of the power supply after the reference value is changed is up to a first step value, and the step value can generally reach 0.1 percent of the target value.
As an example of the process of adjusting the output accuracy of a charging power supply of a 48Vdc lithium battery, the full charge voltage of the 48Vdc lithium battery is 54.3Vdc ± 0.2V, and thus the accuracy requirement for the power supply is 0.3%.
The load reads the output value and sends the output value to a communication module of the power supply, the power supply calculates the calibration offset after receiving the signal, and adjusts the reference signal Vref of the power supply to a higher level (the corresponding change step value of the output voltage is about 0.1V) by adopting multipoint piecewise curve fitting correction, and the reference signal Vref is once more if the detection is still low until the output voltage reaches the load demand value set by a user.
Although the present invention has been described with reference to the above embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention.
Claims (9)
1. A power supply capable of automatically calibrating an output value is characterized by comprising a power circuit, a regulating module and a communication module, wherein the output end of the power circuit is connected with a load, the regulating module controls the power circuit and regulates the output value of the power circuit, the communication module collects a first output value provided by the power circuit for the load and a load demand value and outputs the first output value and the load demand value to the regulating module, and the regulating module corrects an output reference value and regulates the first output value to approach the load demand value according to the output reference value.
2. The power supply for automatically calibrating output value according to claim 1, wherein the adjusting module comprises a driving signal generator, an operator and an error adjuster, the error adjuster samples the second output value and the output reference value at the output end of the power circuit to calculate the error signal, the operator calculates the adjusting signal, and the driving signal generates the driving signal for controlling the switching device in the power circuit according to the adjusting signal.
3. The power supply for automatically calibrating an output value of claim 2, wherein said regulation module uses the difference between said first output value and said load demand value as a calibration offset for said output reference value, and corrects said output reference value based on said calibration offset.
4. The power supply for automatically calibrating an output value of claim 3 wherein said regulation module decreases said output reference value when said first output value is greater than a load demand value and wherein said regulation module increases said output reference value when said first output value is less than said load demand value.
5. The power supply for automatically calibrating output values according to claim 4, wherein said first output value is a voltage value or a current value.
6. The power supply for automatically calibrating an output value according to claim 1, wherein the load is an electronic load, which detects the first output value provided by the power supply and transmits the first output value to the communication module of the power supply.
7. A control method of a power supply for automatically calibrating an output value, comprising the steps of,
setting a load demand value;
detecting a first output value output to a load end by a power supply;
calculating a difference between the first output value and the load demand value as a calibration offset,
the calibration offset is used to correct the output reference value in the power supply control loop,
the first output value of the power supply is adjusted according to the output reference value.
8. The method of claim 7, wherein the method of correcting the output reference value is a single point difference calculation correction, a two point linear equation calculation correction, or a multi-point piecewise curve fitting correction.
9. The method as claimed in claim 8, wherein the calibration offset is stored, and the output reference value is restored to a value before the calibration when the power supply is factory reset.
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