KR20160057289A - Feedback control device, feedback control method and power supply - Google Patents
Feedback control device, feedback control method and power supply Download PDFInfo
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- KR20160057289A KR20160057289A KR1020150079677A KR20150079677A KR20160057289A KR 20160057289 A KR20160057289 A KR 20160057289A KR 1020150079677 A KR1020150079677 A KR 1020150079677A KR 20150079677 A KR20150079677 A KR 20150079677A KR 20160057289 A KR20160057289 A KR 20160057289A
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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
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Abstract
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a feedback control apparatus, a feedback control method, and a power supply apparatus, and more particularly, To a feedback control method and a power supply device.
Description
The present invention relates to a feedback control device, a feedback control method, and a power supply device.
Recently, various types of electronic devices such as a computer, a display device, a lighting device, and various control devices are used in various spaces of a home, an office, a factory, etc. in accordance with various needs of users.
These electronic devices are essentially employed with a power supply device that supplies driving power required internally or externally to perform various operations in accordance with various needs of the user.
Particularly, when the above-described power supply device is used in a lighting device utilizing a light emitting diode (LED), it is necessary for the user to adjust the brightness of the LED according to conditions.
However, due to inherent tolerances inherent in internal and external components of the power supply, such as transformers, control ICs, sensing resistors, error amplifiers, etc., used in the circuit, An output current amount may be generated, thereby causing a deviation of brightness among a plurality of LEDs. In particular, at low light output, this brightness variation can be more easily perceived by the user.
It is an object of the present invention to provide a feedback control device, a feedback control method, and a power supply device capable of minimizing a variation in output current amount between power supply devices.
The above object of the present invention can be achieved by providing a feedback circuit for compensating a voltage according to an external input signal based on a compensation signal for compensating for a difference between an output current value corresponding to an external input signal and a detected load output current value, A control device, a feedback control method, and a power supply device.
According to the present invention as described above, it is possible to compensate for variations in the amount of output current caused by internal and external components of the power supply device, environmental factors, and the like.
In addition, according to the present invention as described above, it is possible to minimize the deviation of the amount of output current between power supply devices.
Also, according to the present invention as described above, the driving currents can be outputted at the same amount of current as the load connected to each power source device.
In addition, according to the present invention as described above, it is possible to minimize a brightness deviation of a lighting apparatus connected to each power supply apparatus.
However, the scope of the present invention is not limited by the above-mentioned effects.
1 is a circuit block diagram for explaining a cause of an output current amount deviation generated in a power supply apparatus;
FIGS. 2A and 2B are diagrams for explaining contents of output current amount deviation caused by the errors described in FIG. 1; FIG.
3 is a configuration diagram of a power supply device that is currently employed.
4 is a schematic view showing a power supply device according to an embodiment of the present invention;
5 is an exemplary configuration diagram of a feedback control unit according to the present embodiment;
6 is a diagram for explaining a dimming signal corresponding current value set by a user as an example;
FIG. 7 is a view for explaining a compensation reference voltage generated in the reference voltage compensating unit of the present embodiment; FIG.
The matters relating to the operational effects including the technical features of the feedback control device, the feedback control method, and the power supply device according to the present invention, including the technical structure of the above-described objects, according to the present invention will be clearly understood from the following description with reference to the drawings, will be.
In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail. Additionally, elements of the drawings are not necessarily drawn to scale. For example, to facilitate understanding of embodiments of the present invention, the dimensions of some of the elements in the figures may be exaggerated relative to other elements. In addition, like reference numerals in different drawings denote like elements, and like reference numerals can indicate similar elements, although not necessarily.
In this specification, the terms first, second, etc. are used to distinguish one element from another element, and the element is not limited by these terms.
Need to compensate output current deviation according to internal and external components of power supply
1 is a circuit block diagram for explaining the cause of the output current amount deviation generated in the power supply apparatus.
Generally, the power supply unit has its tolerance, as shown in FIG. 1, with each of its internal and external components.
For example, (1) represents the error of the input power of the power supply unit.
Also, (2) represents the time constant error of a resistor, a capacitor, an inductor, and a transformer used in a circuit. In this case, although the degree varies depending on the type of circuit used, the difference between the winding ratio, inductance, leakage inductance, and capacitance and series equivalent resistance of the transformer, in particular, can greatly affect the transient and steady state output characteristics.
(3) corresponds to the time constant error of the current detecting element, and is a value obtained by subtracting a tolerance of the sensing resistor for detecting the output current and an amplifier stage for attenuating / amplifying a signal input from the outside (for example, Is due to the tolerance of the device used.
④ shows the time constant error of passive elements, amplifiers, control ICs, etc. used in the control section for controlling the output current according to the external input signal.
In addition, there is also a change in device characteristics with respect to an environmental change (for example, temperature) depending on each installation place, and a physical error due to influence of parasitic components due to component mounting state, assembling state, and the like.
As described above, errors due to the internal and external components cause a variation in the amount of output current, which causes different amounts of output currents even with power supplies of the same design specifications.
Assuming that there is no external input noise, the error of ③ described above can be most intuitively confirmed as a measurement error of a simple signal and the deviation between power supply devices of the same design specification.
However, the errors of ①, ②, and ④ are not intuitively identifiable, although they are factors that can change the control system characteristics of the power supply, and the above-mentioned physical errors are not intuitively confirmed.
FIGS. 2A and 2B are diagrams for explaining the output current amount deviation caused by the error shown in FIG.
For example, when the power supply unit drives the LED module, if it is desired to control the LED current to the size of 1A, the dimming signal voltage Vdimmmer corresponding to 1A is provided as shown in FIG. 2A, You can do it.
However, in the case of a general power supply device, although the dimming signal voltage Vdimmer corresponding to 1A is provided, the desired output value can not be controlled due to the errors described in FIG. In other words, although the deviation of the output current due to the errors in FIG. 1 occurs, the control loop does not recognize such an error.
For example, as shown in FIG. 2B, when the error of 5% of the power supply unit, the error of the
3 schematically shows a configuration diagram of a
As shown in FIG. 3, the currently used
In such a structure, for example, when a plurality of lighting LED modules are driven, the same signal is inputted from the outside (for example, a signal output section such as a dimmer) for brightness control, Not only the error but also errors due to the internal and external components described above with reference to FIGS. 1 and 2, the currents of different sizes are output between the power supply units having the same design specification.
Therefore, despite the space in which a plurality of lighting power supply units having the same design specifications are installed, the respective lighting apparatuses output light of different brightness due to the output current deviation between the power supply units. Such a deviation may be larger especially at low light output.
Thus, in this embodiment, a configuration example of a power source device capable of minimizing a deviation in output current amount between each power source device by compensating an output current amount deviation according to internal and external components of the power source device, environmental factors, and the like will be adopted. Hereinafter, this will be described in detail.
The invention Example
4 is a schematic diagram illustrating a
Referring to FIG. 4, the
First, the
Therefore, in this embodiment, power can be supplied at a power transfer ratio between the primary and secondary windings of the transformer to provide an output voltage Vo for driving the
That is, in the primary winding, a power switching device is connected, and the power switching device is controlled by a PWM signal. When the width of the PWM signal is varied, the power transfer ratio between the primary and secondary windings can be controlled.
In this case, the
Meanwhile, the
The
The
For example, the
The
On the other hand, the
The
At this time, the
In this case, the compensation reference voltage is a compensation control value for minimizing the output current amount deviation of each power supply device due to internal and external components, environmental factors, and the like so that each power supply device outputs the driving current of LED or the like with the same amount of current .
Therefore, the
5 shows an exemplary configuration of the
5, the
The external signal corresponding current
6 is a diagram for explaining an external signal corresponding current value Icmd set by the user, and particularly shows a case of a source dimmer for outputting a voltage.
If the signal input from the outside is a dimming signal, the external signal corresponding current value Icmd can be changed according to the brightness change request (dimming voltage Vdimmer according to the dimming signal) of the user, The external signal corresponding current value Icmd can be set in advance in the form of a lookup table as shown in Table 1 below. At this time, the lookup table can be implemented in both analog and digital form.
5, the signal input to the external signal corresponding current
5, the
In this case, the load output current value VI_sensing input to the
The
5, the
As a result, the
The reference
When an error signal is outputted from the
For example, the error compensating section 143-1 may add the error signal output from the
As a result, the error compensator 143-1 compares the current error signal indicating the difference between the external signal corresponding current value set by the user and the currently detected load output current value, and the external signal corresponding current value set by the user And a method of adding a previous error signal indicating the difference between the output current values of the load and the load current.
The error compensation unit 143-1 may be implemented as a PI, ground, or terrestrial compensator. However, the present invention is not limited thereto, and the error compensation unit 143-1 may be configured to detect the load output current value VI_sensing, It is needless to say that the present invention can be implemented in any form as long as it is a controller for compensating an error of a value.
5, the compensation reference voltage generating section 143-2 supplies the voltage (Vdimmmer) corresponding to a signal (for example, a dimming signal inputted from an external dimmer or the like) inputted from the outside to the voltage And the compensation signal Verr output from the comparator 143-1 to generate the compensation reference voltage Vref.
That is, the compensation reference voltage generating section 143-2 generates a compensated reference voltage Vout based on the compensation signal Verr that compensates for the difference between the external signal corresponding current value set by the user and the detected load output current value VI_sensing, The compensated reference voltage Vref is compensated for the compensated reference voltage Vdimmer and the generated compensated reference voltage Vref is supplied to the
In the case of the conventional
7 is a diagram for explaining the compensation reference voltage Vref generated by the reference
Therefore, the compensation reference voltage Vref provided through the reference
5, the
That is, the
5, the
The functions of the various elements shown in the drawings of the present invention may be provided through use of dedicated hardware as well as hardware capable of executing software in association with appropriate software. When provided by a processor, such functionality may be provided by a single dedicated processor, a single shared processor, or a plurality of individual processors, some of which may be shared.
Further, explicit use of the term "control portion " should not be construed to refer exclusively to hardware capable of executing software, and includes, without limitation, microprocessor (MCU), digital signal processor But may implicitly include read-only memory (ROM), random access memory (RAM), and non-volatile storage.
In the claims hereof, the elements depicted as means for performing a particular function encompass any way of performing a particular function, such elements being intended to encompass a combination of circuit elements that perform a particular function, Microcode, etc., coupled with suitable circuitry to perform the software for the
Reference throughout this specification to " one embodiment ", etc. of the principles of the invention, and the like, as well as various modifications of such expression, are intended to be within the spirit and scope of the appended claims, it means.
Thus, the appearances of the phrase " in one embodiment " and any other variation disclosed throughout this specification are not necessarily all referring to the same embodiment.
Where the method is described herein as including a series of steps, the order of such steps presented herein is not necessarily the order in which such steps may be performed, any of the described steps may be omitted and / Any other step not described will be additive to the method.
The use of the term " connected " or " connecting " herein, and the various variations of such expressions, are used herein to mean connecting directly or indirectly, electrically or non-electrically, other components.
Also, objects described herein as "adjacent" may be in physical contact with each other, in close proximity to one another, or in the same general range or region as the context in which they are used.
Also, the singular forms in this specification include plural forms unless the context clearly dictates otherwise. Also, components, steps, operations, and elements referred to in the specification as " comprises " or " comprising " refer to the presence or addition of one or more other components, steps, operations, elements, and / or devices.
The present invention has been described with reference to the preferred embodiments. It is to be understood that all embodiments and conditional statements disclosed herein are intended to assist the reader in understanding the principles and concepts of the present invention to those skilled in the art, It will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the following claims. The scope of the present invention is defined by the appended claims rather than by the foregoing description, and all differences within the scope of equivalents thereof should be construed as being included in the present invention.
100: power supply unit 110: power supply unit
120: current detection unit 130: current detection unit
140: feedback circuit section 141: external signal corresponding current value generating section
142: Error amplifier 143: Reference voltage compensator
143-1: Error Compensation Unit 143-2: Compensation Reference Voltage Generation Unit
144: feedback signal generator 150:
Claims (46)
The compensation signal may comprise:
A current error signal indicating a difference between the preset output current value and the currently detected load output current value and a previous error signal indicating a difference between the previously set output current value and the previously detected load output current value are generated / RTI >
Wherein the compensation reference voltage is generated by adding a voltage according to the external input signal and the compensation signal.
The feedback control device includes:
An external signal corresponding current value generation unit for generating an output current value corresponding to an external input signal and corresponding to a voltage according to the external input signal;
An error amplifier for outputting an error signal indicating a difference between the output current value generated from the external signal corresponding current value generator and the detected load output current value;
A reference voltage compensator for generating and outputting the compensation signal based on the error signal output from the error amplifier and generating the compensation reference voltage based on the compensation signal and the voltage according to the external input signal; And
A feedback signal generator for generating the feedback signal by comparing the compensation reference voltage generated by the reference voltage compensator with the detected load output current value;
.
Wherein the reference voltage compensator comprises:
An error compensator configured to generate and output the compensation signal based on the error signal output from the error amplifier; And
A compensation reference voltage generator for generating the compensation reference voltage based on the compensation signal output from the error compensation unit and the voltage according to the external input signal;
.
Wherein the error compensator comprises:
A current error signal indicating a difference between the output current value generated from the external signal corresponding current value generation unit and the currently detected load output current value and the output current value generated from the external signal corresponding current value generation unit, And adding a previous error signal indicating a difference between the detected load output current value and the detected load output current value to generate the compensation signal.
Wherein the compensation reference voltage generator comprises:
And generates a compensation reference voltage by adding a voltage according to the external input signal and the compensation signal.
Wherein the load is an LED module composed of one or more LEDs.
Wherein the voltage according to the external input signal is a dimming voltage according to the dimming signal.
The compensation signal may comprise:
A current error signal indicating a difference between the preset output current value and the currently detected load output current value and a previous error signal indicating a difference between the previously set output current value and the previously detected load output current value are generated / RTI >
Wherein the compensation reference voltage is generated by adding a voltage according to the external input signal and the compensation signal.
The feedback control device includes:
An external signal corresponding current value generation unit for generating an output current value corresponding to an external input signal and corresponding to a voltage according to the external input signal;
An error amplifier for outputting an error signal indicating a difference between the output current value generated from the external signal corresponding current value generator and the detected load output current value;
A reference voltage compensator for generating and outputting the compensation signal based on the error signal output from the error amplifier and generating the compensation reference voltage based on the compensation signal and the voltage according to the external input signal; And
A feedback signal generator for generating the feedback signal by comparing the compensation reference voltage generated by the reference voltage compensator with the detected load output current value;
.
Wherein the reference voltage compensator comprises:
An error compensator configured to generate and output the compensation signal based on the error signal output from the error amplifier; And
A compensation reference voltage generator for generating the compensation reference voltage based on the compensation signal output from the error compensation unit and the voltage according to the external input signal;
.
Wherein the error compensator comprises:
A current error signal indicating a difference between the output current value generated from the external signal corresponding current value generation unit and the currently detected load output current value and the output current value generated from the external signal corresponding current value generation unit, And adding a previous error signal indicating a difference between the detected load output current value and the detected load output current value to generate the compensation signal.
Wherein the compensation reference voltage generator comprises:
And generates a compensation reference voltage by adding a voltage according to the external input signal and the compensation signal.
Wherein the load is an LED module composed of one or more LEDs.
Wherein the voltage according to the external input signal is a dimming voltage according to the dimming signal.
An output current value corresponding to an external input signal is preset and a compensation reference voltage is generated based on a compensation signal compensating for a difference between the output current value and a detected load output current value set in advance and a voltage corresponding to the external input signal A feedback control unit for comparing the compensation reference voltage with the detected load output current value to provide a feedback signal for controlling power supply of the power supply unit;
≪ / RTI >
The compensation signal may comprise:
A current error signal indicating a difference between the preset output current value and the currently detected load output current value and a previous error signal indicating a difference between the previously set output current value and the previously detected load output current value are generated Power supply.
Wherein the compensation reference voltage is generated by adding a voltage according to the external input signal and the compensation signal.
Wherein the feedback control unit includes:
An external signal corresponding current value generation unit for generating an output current value corresponding to an external input signal and corresponding to a voltage according to the external input signal;
An error amplifier for outputting an error signal indicating a difference between the output current value generated from the external signal corresponding current value generator and the detected load output current value;
A reference voltage compensator for generating and outputting the compensation signal based on the error signal output from the error amplifier and generating the compensation reference voltage based on the compensation signal and the voltage according to the external input signal; And
A feedback signal generator for generating the feedback signal by comparing the compensation reference voltage generated by the reference voltage compensator with the detected load output current value;
≪ / RTI >
Wherein the reference voltage compensator comprises:
An error compensator configured to generate and output the compensation signal based on the error signal output from the error amplifier; And
A compensation reference voltage generator for generating the compensation reference voltage based on the compensation signal output from the error compensation unit and the voltage according to the external input signal;
≪ / RTI >
Wherein the error compensator comprises:
A current error signal indicating a difference between the output current value generated from the external signal corresponding current value generation unit and the currently detected load output current value and the output current value generated from the external signal corresponding current value generation unit, And adding a previous error signal indicative of a difference from the detected load output current value to generate the compensation signal.
Wherein the compensation reference voltage generator comprises:
And generates a compensation reference voltage by adding a voltage according to the external input signal and the compensation signal.
Wherein the load is an LED module composed of one or more LEDs.
Wherein the voltage according to the external input signal is a dimming voltage according to the dimming signal.
A current detector for detecting the load output current value; And
A current control unit for controlling power supply of the power supply unit by the feedback signal;
Further comprising:
A first amplifier amplifying a voltage according to the external input signal and outputting the amplified voltage to the external signal corresponding current value generator; And
A second amplifier for amplifying the detected load output current value and outputting the amplified value to the error amplifier;
Further comprising:
A power supply unit for supplying power for driving the load by a power transfer ratio between the windings of the primary side and the secondary side; And
An output current value corresponding to an external input signal is preset and a compensation reference voltage is generated based on a compensation signal compensating for a difference between the output current value and a detected load output current value set in advance and a voltage corresponding to the external input signal A feedback control unit for providing a feedback signal to the primary to control power supply of the power supply unit by comparing the compensation reference voltage with the detected load output current value;
≪ / RTI >
The compensation signal may comprise:
A current error signal indicating a difference between the preset output current value and the currently detected load output current value and a previous error signal indicating a difference between the previously set output current value and the previously detected load output current value are generated and generated Power supply.
Wherein the compensation reference voltage is generated by adding a voltage according to the external input signal and the compensation signal.
Wherein the feedback control unit includes:
An external signal corresponding current value generation unit for generating an output current value corresponding to an external input signal and corresponding to a voltage according to the external input signal;
An error amplifier for outputting an error signal indicating a difference between the output current value generated from the external signal corresponding current value generator and the detected load output current value;
A reference voltage compensator for generating and outputting the compensation signal based on the error signal output from the error amplifier and generating the compensation reference voltage based on the compensation signal and the voltage according to the external input signal; And
A feedback signal generator for generating the feedback signal by comparing the compensation reference voltage generated by the reference voltage compensator with the detected load output current value;
≪ / RTI >
Wherein the reference voltage compensator comprises:
An error compensator configured to generate and output the compensation signal based on the error signal output from the error amplifier; And
A compensation reference voltage generator for generating the compensation reference voltage based on the compensation signal output from the error compensation unit and the voltage according to the external input signal;
≪ / RTI >
Wherein the error compensator comprises:
A current error signal indicating a difference between the output current value generated from the external signal corresponding current value generation unit and the currently detected load output current value and the output current value generated from the external signal corresponding current value generation unit, And adding a previous error signal indicative of a difference from the detected load output current value to generate the compensation signal.
Wherein the compensation reference voltage generator comprises:
And generates a compensation reference voltage by adding a voltage according to the external input signal and the compensation signal.
Wherein the load is an LED module composed of one or more LEDs.
Wherein the voltage according to the external input signal is a dimming voltage according to the dimming signal.
A current detector for detecting the load output current value;
A current control unit for controlling power supply of the power supply unit by the feedback signal; And
A signal transmission unit for transmitting the feedback signal to the current control unit;
Further comprising:
A first amplifier amplifying a voltage according to the external input signal and outputting the amplified voltage to the external signal corresponding current value generator; And
A second amplifier for amplifying the detected load output current value and outputting the amplified value to the error amplifier;
Further comprising:
Generating a compensation signal to compensate for a difference between the preset output current value and the detected load output current value;
Generating a compensation reference voltage based on the generated compensation signal and the voltage according to the external input signal; And
Comparing the generated compensation reference voltage with the detected load output current value to generate a feedback signal for controlling power supply to the load;
/ RTI >
In the step of generating the compensation signal,
A current error signal indicating a difference between the output current value and a currently detected load output current value and a previous error signal indicating a difference between a preset output current value and a previously detected load output current value, A feedback control method for generating a compensation signal.
In the step of generating the compensation reference voltage,
Wherein the compensation reference voltage is generated by adding the voltage according to the external input signal and the compensation signal.
Wherein the load is an LED module composed of one or more LEDs.
Wherein the voltage according to the external input signal is a dimming voltage according to the dimming signal.
Setting an output current value corresponding to an external input signal in advance;
Generating a compensation signal to compensate for a difference between the preset output current value and the detected load output current value;
Generating a compensation reference voltage based on the generated compensation signal and the voltage according to the external input signal; And
Comparing the generated compensation reference voltage with the detected load output current value to generate a feedback signal for controlling power supply to the load;
/ RTI >
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR20140158007 | 2014-11-13 | ||
| KR1020140158007 | 2014-11-13 |
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| KR20160057289A true KR20160057289A (en) | 2016-05-23 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101723431B1 (en) * | 2016-06-23 | 2017-04-05 | 성신전기공업(주) | High precision voltage control apparatus based on dual current feedback with virtually weighted reactance method thereof |
-
2015
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101723431B1 (en) * | 2016-06-23 | 2017-04-05 | 성신전기공업(주) | High precision voltage control apparatus based on dual current feedback with virtually weighted reactance method thereof |
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