KR101732938B1 - Smart Power Supply Unit - Google Patents

Abstract

The smart power supply unit of the present invention includes a power input unit for receiving AC power from the outside, a power output unit for rectifying AC power supplied from the power input unit to supply rectified power to the load, And a power consumption calculation unit for calculating a power consumed in the load, a monitoring information including a presence / absence of a defect detected by the power detection unit, and an amount of power calculated by the power usage calculation unit, And a control unit for transmitting the monitoring information stored in the monitoring unit to the management server and controlling the power input unit or the power output unit according to the monitoring information received from the monitoring unit or the control information received from the management server, And Therefore, it is possible to estimate life span, parts replacement, inspection and the like easily by grasping the presence or absence of defects that may arise from various problems such as ripple voltage generation, output voltage and current which may be caused by failure of the power supply unit You can expect.

Description

[0001] Smart power supply unit [0002]

The present invention relates to a smart power supply unit.

A power supply unit (PSU) that can be easily accessed in real life is a device that rectifies AC power to a rectified power source and supplies it to various electronic devices using rectified power. The power supply unit is a linear type and a switching Switching type power supplies.

Among the above methods, a switching power supply (SMPS, hereinafter referred to as "switching power supply") has a small size, high efficiency, and stable output, unlike the linear type.

In general, a smoothing capacitor uses an aluminum electrolytic capacitor capable of producing a large capacity capacitor at a low cost. The capacitor used in a switching power supply has a lifetime of about 7 to 10 years in an environment of 25 degrees, There is a large gap in capacitor life over temperature for about two years.

When such an aluminum electrolytic capacitor is used in a high-temperature sealed environment such as a switching power supply, the electrolytic solution filled therein is evaporated by the heat generated in the capacitor.

The evaporation of the electrolyte reduces the capacitance of the capacitor, so that the capacity of the capacitor decreases with time, thereby increasing the ripple of the output voltage of the rectifier.

That is, when the switching power supply is used for a certain period of time, the capacity of the smoothing capacitor is reduced, and an excessive ripple voltage is generated. Excessive ripple voltage is a main cause of failure of the system by changing characteristics of the switching power supply .

Accordingly, a method for minimizing the ripple voltage has been sought, and this is disclosed in Korean Patent Laid-Open Publication No. 10-1995-0015939.

However, it is possible to minimize the ripple voltage, but it is impossible to eliminate the source from the source. Therefore, it is necessary to monitor the life of the power supply device by monitoring the state of the smoothing capacitor in real time.

Therefore, in order to predict the lifetime of the switching power supply, a technique for measuring and monitoring voltage ripple of the smoothing capacitor in real time should be sought.

An object of the present invention is to provide a power supply unit capable of detecting whether or not a capacitor has failed and a lifetime based on a ripple voltage generated by an electric element to detect whether or not the power supply unit normally operates.

The above object of the present invention can be achieved by a power supply apparatus comprising: a power input unit for receiving AC power from the outside; a power output unit for rectifying AC power supplied from the power input unit to supply rectified power to the load; A power detector for detecting the presence or absence of a defect, a power usage calculator for calculating a power consumed in the load,

A monitoring unit for storing monitoring information including a presence / absence of a defect detected by the power detecting unit and an amount of power calculated by the power usage calculating unit; and a monitoring unit for transmitting monitoring information stored in the monitoring unit to a management server, And a control unit for controlling the power input unit or the power output unit according to received monitoring information or control information received from the management server.

Wherein the power detection unit includes a voltage detection unit that detects a voltage value of the AC power input to the power input unit and a voltage value of the rectified power source rectified by the power output unit, A ripple voltage detecting portion for detecting the presence or absence of a defect in the ripple voltage, and a current detecting portion for detecting the presence or absence of a defect in the current of the rectified power supply rectified by the power output portion.

The voltage detection unit may include a first amplification stage for amplifying the voltage value of the AC power input to the power input unit and the rectified power rectified by the power output unit and amplifying the rectified power with a predetermined gain, A first filter stage for removing a high frequency band of the AC power source and a rectified power source, and a first filter stage for detecting the presence or absence of a defect by comparing the AC power source and the rectified power source, And a detection stage.

The ripple voltage detection section may include a coupling stage for removing a direct current component from a signal rectified by the power output section, a second amplification stage for amplifying a rectified power source from which the direct current component is removed by the coupling stage, A ripple voltage is extracted from a rectified power source amplified by the second amplification stage to remove a high frequency band and a rectified power source in which a high frequency band is removed by the second filter stage and then compared with a normal ripple voltage value, And a second detection stage for detecting the first detection signal.

A third filter stage for removing a high frequency band of the rectified power source amplified by the third amplification stage and a third filter stage for removing a high frequency band amplified by the third amplification stage, And a third detection stage for detecting the presence or absence of a defect by comparing a rectified power source in which a high frequency band has been removed by a stage with a normal current value.

The monitoring unit accumulates the voltage value detected by the voltage detecting unit, the ripple voltage detecting unit, and the current detecting unit, the ripple voltage value, and the current value every predetermined time unit, and, based on the rate of change of the accumulated value, And estimates the life of the output section.

If the control unit detects that the voltage value, the ripple voltage value, and the current value are defective by the voltage detection unit, the ripple voltage detection unit, and the current detection unit, the control unit detects the detected voltage value, the ripple voltage value, And provides monitoring information to the management server at different alarm levels according to the magnitude of the current value.

The control section controls the power input section to stop the operation of the power input section when it is detected that a defect has occurred in at least one of the voltage detection section, the ripple voltage detection section, and the current detection section.

The control unit receives the normal voltage value, the normal ripple voltage value, and the normal current value, which are the criteria for detecting the presence or absence of a defect in the voltage detecting portion, the ripple voltage detecting portion, or the current detecting portion, And to detect the presence or absence of a defect in the power supply according to the received normal value.

The power usage calculation unit may store the power usage of the load at predetermined time intervals, and may transmit power usage information for each period to the monitoring unit.

The present invention can expect the effect of quickly replacing parts by monitoring the occurrence of ripple voltage which may be caused by a failure of the power supply unit in real time.

Further, it is possible to detect the presence or absence of a defect in the ripple voltage, and to detect abnormality of the input power source, such as a fluctuation of the output voltage and the output current value rectified by the rectifying circuit, Various problems are detected at the same time, so that it is possible to expect an effect that the power supply unit can be easily checked by approaching the generated problem in various angles.

1 is a block diagram illustrating a smart power supply unit of the present invention.
2 is a block diagram showing the power detector of the present invention.

The preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings, in which the technical parts already known will be omitted or compressed for the sake of brevity.

1, the smart power supply unit 100 of the present invention includes a power input unit 110, a power output unit 111, a power detection unit 120, a power usage calculation unit 130, a monitoring unit 140 And a control unit 150, as shown in FIG.

The power input unit 110 is a component that receives AC power from the outside.

The power output unit 111 is a component that rectifies the DC power supplied from the power input unit 110 and supplies the rectified power to the load L.

The commercial power supply generally supplied is an AC power supply of 220 to 230 V, and a large number of DC power supplies are used in various electrical equipments.

Accordingly, the power output unit 110 is provided with a rectifying circuit for rectifying the AC power to a DC voltage using a plurality of diode elements, and a smoothing capacitor or the like for further maintaining the rectified power source closer to DC.

The description of the rectifier circuit and the smoothing capacitor described above is omitted because it is a well-known technique.

The power detecting unit 120 detects the presence or absence of a defect in the AC power supplied from the power input unit 110 and the rectified power supplied from the power output unit 111. In the embodiment of the present invention, The voltage value of the supplied AC power, the voltage value, the current value and the ripple voltage value of the rectified power supply rectified by the power output unit 111 are detected.

The power detection unit 120 for this purpose includes a voltage detection unit 121, a ripple voltage detection unit 122, and a current detection unit 123.

The voltage detection part 121 is provided for detecting the presence of a voltage defect by receiving the AC power applied from the power input part 110 and the rectified power rectified by the power output part 111. The voltage detection part 121 includes a first amplification stage 121A, And includes a first filter stage 121B and a first detection stage 121C.

The first amplification stage 121A is a component for amplifying the AC power supplied from the power input unit 110 and the rectified power rectified by the power output unit 111 to gain a predetermined gain.

According to the embodiment of the present invention, the first amplification stage 121A is provided with a non-inverting amplification circuit using an operational amplifier (OP AMP).

The first filter stage 121B removes high frequency bands of the AC power and the rectified power amplified by the first amplification stage 121A. The first filter stage 121B removes electrical noise in the high frequency band generated by the circuit, And it is provided to improve the accuracy of detection by removing unnecessary portions.

The first detection stage 121C is a component for detecting the presence or absence of a defect by comparing an AC power source or a rectified power source in which a high frequency band is removed by a first filter stage with a normal voltage value.

At this time, the first detection stage 121C judges that a defect has occurred when the measured AC power supply voltage or the voltage of the rectified power supply is larger than the preset normal voltage range.

For example, the voltage value of the AC power source applied to the power input unit 110 (here, the voltage value uses an RMS (Root Mean Square) value that is an average value of commonly used AC signals) or a power output unit 111 If the voltage value of the rectified power supply rectified by the power supply unit 110 is out of the range of 90% to 110% of the normal voltage, there is a problem in the power supply output unit 111 for rectifying the alternating- If it is detected that there is a defect, the voltage detection information is transmitted to the monitoring unit 140.

The ripple voltage detecting portion 122 is a component for detecting the presence or absence of a defect in the ripple voltage by extracting the ripple voltage of the rectified power supplied from the power source output portion 111. For this purpose, A first amplification stage 122A, a second amplification stage 122B, a second filter stage 122C and a second detection stage 122D.

The coupling stage 122A removes a direct current component (meaning a direct current component, which means an offset value) from the rectified power source applied from the power output unit 110. [

At this time, the coupling terminal 122A is provided with a capacitor having a predetermined capacitance connected in series with the power output unit 111. [

That is, the coupling stage 122A of the present invention is a component for AC coupling of an input signal, and a resistor capacitor (RC) filter having a single-pole and high-pass frequency for the positive and negative signal paths The ripple voltage of the rectified signal is remained by the above-described process. [0051] In the above-described embodiment,

The second amplifying stage 122B is a component that amplifies the rectified power source from which the DC component has been removed by the coupling stage 122A with a predetermined gain.

In general, since the ripple voltage has a very small size of several tens of mV, it is difficult to detect from a general signal, so that the second amplification stage 122B amplifies the ripple voltage.

The second filter stage 122C is a component that removes the high frequency band from the rectified power source amplified by the second amplification stage 122B, like the first filter stage 121B described above.

The second detection stage 122D is a component that detects the presence or absence of a defect by extracting the ripple voltage from the rectified power source from which the high frequency band is removed by the second filter stage 122C and comparing the ripple voltage with a normal ripple voltage value.

At this time, the second detection stage 122D determines that a defect has occurred when the measured ripple voltage is larger than a predetermined ripple size.

According to the embodiment of the present invention, the second detection stage 122D is separated from the rectified power source by a predetermined frequency, and then the magnitude of the ripple voltage is calculated as a root mean square (RMS) value.

Since the frequency of the commercial power supply is 60 Hz, the ripple voltage by the rectifying unit 140 appears near the integer frequency of the commercial power supply. Therefore, the second detection stage 122D is a frequency (120 Hz, 240 Hz) It is preferable to calculate the ripple voltage in the vicinity of the above-mentioned frequency.

The current detection section 123 is a component for detecting the presence or absence of a defect in the current of the rectified power supply rectified by the power supply output section 111. For this purpose, the third amplification stage 123A, the third filter stage 123B, And a detection stage 123C.

Like the second amplification stage 122B, the third amplification stage 123A receives a rectified power rectified by the power output unit 111 and amplifies the amplified power by a predetermined gain.

The third filter stage 123B is a component that removes a high frequency band of the rectified power source amplified by the third amplification stage 123A. Like the first filter stage 123B and the second filter stage 123C, To eliminate electrical noise in the high frequency band generated by the defects, and to remove unnecessary portions in determining the presence or absence of defects, thereby enhancing the accuracy of detection.

The third detection stage 123C is a component that detects the presence or absence of a defect by comparing the rectified power source in which the high frequency band is removed by the third filter stage 123B with a normal current value.

For example, when the current value of the rectified power source rectified by the power output unit 111 is out of the range of 90% to 110% of the steady voltage, it is determined that there is a problem with the rectified power source rectified by the power input unit 110 do.

The power consumption calculation unit 130 calculates power to be consumed in the load L and calculates power consumed in the load L by calculating the standby power of the load L and consumed power consumed in a predetermined time unit, And transmits it to the monitoring unit 140.

As described above, the power consumption calculation unit 130 can estimate the power consumption per period by storing the power consumption of the load L at predetermined time intervals, and obtains information about the power consumption at which time can do.

Furthermore, by calculating and accumulating the standby power of the load L, it is also possible to acquire information that can determine the presence or absence of a defect by increasing or decreasing the standby power.

The monitoring unit 140 monitors the input voltage (AC power) applied to the power input unit 110 detected by the power detecting unit 120, the output voltage (current) that is rectified by the power output unit 111 and applied to the load L A rectification power source), the presence or absence of a ripple voltage and an output current, and the power information calculated by the power consumption calculation unit 140 to collect monitoring information.

At this time, the monitoring unit 140 accumulates the voltage value, the ripple voltage value, and the current value detected by the voltage detecting unit 121, the ripple voltage detecting unit 122, and the current detecting unit 123 every predetermined time unit And estimates the life of the power output unit 111 according to the rate of change of the accumulated value.

In general, there may be a slight change in the voltage value, the ripple voltage value, and the current value due to various factors such as the use time of the power output unit 111 and the like.

Particularly, since the change of the ripple voltage value is closely related to the lifetime, it is possible to estimate the lifetime by accumulating the above values and analyzing the rate of change of the accumulated values.

The control unit 150 provides the monitoring information received from the monitoring unit 140 to the management server 200 and provides the monitoring information to the power management unit 200 according to the control information received from the management server 200 or the monitoring information received from the monitoring unit 140. [ The voltage detection part 121, the ripple voltage detection part 122, or the current detection part 123 is a component for controlling whether the power supply part 110 or the power output part 111 is operated. And controls the power input unit 110 or the power output unit 111 to shut down.

Furthermore, the control unit 150 determines that the voltage value, the ripple voltage value, and the current value detected by the voltage detection unit 121, the ripple voltage detection unit 122, and the current detection unit 123 are defective The monitoring server 200 provides monitoring information to the management server 200 at different alarm levels according to the detected voltage values, the ripple voltage values, and the current values.

At this time, the alert level may be adjusted based on the control information received from the management server 200, and a separate input unit (not shown) may be provided for direct input.

In addition, the control unit 150 can differentiate the steady-state values to be compared, from which the voltage detection unit 121, the ripple voltage detection unit 122, or the current detection unit 123 detects the presence or absence of a defect, Can be controlled to detect the presence or absence of a defect in the power supply based on a normal value received from the management server 200 or from a separate input unit (not shown).

For example, as described above, a criterion for generating a defect in the ripple voltage of the ripple voltage detecting portion 122 is provided as several tens of mV, and when a ripple voltage value higher than the above value is detected, it is detected that a defect occurs.

Accordingly, the control unit 150 receives the normal or smaller normal ripple voltage value to be newly applied from the management server 200, and detects the presence or absence of the ripple voltage with the normal ripple voltage value at the second detection stage 122D .

Therefore, according to the present invention as described above, the occurrence of ripple voltage, which may be generated by a failure, is monitored in real time, so that an effect of quickly replacing parts can be expected.

Furthermore, it is possible to detect the presence or absence of a defect in the ripple voltage, and to detect an abnormal input power source that can be generated due to the life of the power supply unit or the installation environment, the fluctuation of the output voltage and output current value rectified by the rectification circuit It is possible to expect the effect that the power supply unit can be easily checked by approaching the generated problem in various angles.

The embodiments disclosed in the present invention are not intended to limit the scope of the present invention and are not intended to limit the scope of the present invention. The scope of protection is to be construed in accordance with the following claims, and all technical ideas within the scope of equivalents thereof should be construed as being included in the scope of the present invention.

L: Load
100: Smart power supply unit
110: power input unit 111: power output unit
120: Power detector
121: Power detection part
121A: first amplification stage 121B: first filter stage
121C: first detection stage
122: ripple voltage detection portion
122A: coupling stage 122B: second amplification stage
122C: second filter stage 122D: second detection stage
123: current detection portion
123A: third amplification stage 123B: third filter stage
123C: third detection stage
130: power consumption calculation unit 140: monitoring unit
150:
200: management server

Claims (10)

As a smart power supply unit,
A power input unit for receiving AC power from the outside;
A power output unit for rectifying the AC power supplied from the power input unit and supplying rectified power to the load;
A power detector for detecting the presence or absence of a defect in the power supplied from the power input unit and the power output unit;
A power usage calculation unit for calculating a power consumed in the load;
A monitoring unit for storing monitoring information including the presence or absence of a defect detected by the power detection unit and the amount of power calculated by the power usage calculation unit; And
And a control unit for transmitting the monitoring information stored in the monitoring unit to the management server and controlling the power input unit or the power output unit according to the monitoring information received from the monitoring unit or the control information received from the management server,
The power detection unit may include:
A voltage detecting portion for detecting a voltage value of the AC power inputted to the power input portion and a voltage value of the rectified power rectified by the power output portion;
A ripple voltage detecting portion for extracting a ripple voltage from the rectified power source rectified by the power output portion and detecting the presence or absence of a defect in the ripple voltage; And
And a current detecting section for detecting the presence or absence of a defect in the current of the rectified power supply rectified by the power output section,
The voltage detecting portion includes:
A first amplifying stage for receiving a voltage value of an AC power input to the power input unit and a rectified power rectified by the power output unit and amplifying the rectified power with a predetermined gain;
A first filter stage for removing high frequency bands of the AC power and the rectified power amplified by the first amplification stage; And
And a first detection stage for detecting the presence or absence of a defect by comparing the AC power source and the rectified power source, from which the high frequency band is removed by the first filter stage, with respective normal voltage values,
The ripple voltage detection portion
A coupling terminal for removing a DC component from a signal rectified by the power output unit;
A second amplifying stage for amplifying a rectified power source from which a DC component has been removed by the coupling stage with a predetermined gain;
A second filter stage for removing a high frequency band from the rectified power source amplified by the second amplification stage; And
And a second detection stage that detects the presence or absence of a defect by extracting a ripple voltage from a rectified power source in which a high frequency band is removed by the second filter stage and comparing the ripple voltage with a normal ripple voltage value. delete delete delete The method according to claim 1,
The current detection portion
A third amplifying stage receiving the rectified power from the power output unit and amplifying the rectified power with a predetermined gain;
A third filter stage for removing a high frequency band of the rectified power source amplified by the third amplification stage; And
And a third detection stage for detecting the presence or absence of a defect by comparing a rectified power source in which a high frequency band is removed by the third filter stage with a normal current value. The method according to claim 1,
The monitoring unit,
The ripple voltage value and the current value detected by the voltage detection portion, the ripple voltage detection portion, and the current detection portion are accumulated every predetermined time unit, and the lifetime of the power output portion is determined according to the rate of change of the accumulated value The smart power supply unit comprising: The method according to claim 6,
Wherein,
The ripple voltage value, and the current value are detected by the voltage detection section, the ripple voltage detection section, and the current detection section as a defect in the voltage value, the ripple voltage value, and the current value, And provides the monitoring information to the management server at different alarm levels according to the alarm level. The method according to claim 1,
Wherein,
Wherein the controller controls to stop the operation of the power input unit when it is detected that a defect has occurred in at least one of the voltage detection portion, the ripple voltage detection portion, and the current detection portion. The method according to claim 1,
Wherein,
A steady ripple voltage value and a steady current value, which are the reference for detecting the presence or absence of a defect in the voltage detecting portion, the ripple voltage detecting portion, or the current detecting portion, from the management server, And controls to detect the presence / absence of a defect in the power supply. The method according to claim 1,
The power usage calculation unit may calculate,
Wherein the power consumption amount of the load is stored in a predetermined time unit, and the power consumption amount information for each period is transmitted to the monitoring unit.

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