JP6499981B2 - Power supply deterioration measurement device - Google Patents

Description

  The present invention relates to a power supply device deterioration measuring apparatus used for measuring deterioration of circuit components in a power supply device.

  AC-DC converters (hereinafter referred to as AC adapters) used as one of the switching power supplies generally rectify the AC voltage of the commercial power supply using a diode bridge and store it in the primary smoothing capacitor. After the converted voltage is converted into a DC voltage of a rated value by a switching transformer, the voltage is supplied to an electronic device that is a load unit.

  By the way, in this type of power supply device, the current is repeatedly turned on and off at a switching frequency of 50 kHz to 100 kHz in the switching transformer. For this reason, voltage fluctuations due to noise in the switching frequency and its harmonic frequency band occur, and this is superimposed on the commercial power supply voltage. The primary smoothing capacitor sucks and sweeps the switching current, and plays a role of suppressing the voltage fluctuation of the commercial power source caused by the switching current. For this reason, when the primary smoothing capacitor is deteriorated and the internal impedance is increased, the switching current sucking and sweeping capability is decreased, and the fluctuation range of the commercial power supply voltage is increased. Therefore, according to the JEITA switching power supply test standard (AC-DC), the deterioration of the primary smoothing capacitor is determined by measuring the fluctuation of the noise terminal voltage with respect to the ground potential (see, for example, Non-Patent Document 1). ).

  However, in order to measure the noise terminal voltage in accordance with the switching power supply test standard, an expensive spectrum analyzer is required. Also, when using a pseudo power supply network in this measurement, it is necessary to connect to the reference ground (ground). If it is not connected to the appropriate ground, the measured value will not be stable, but it may be difficult to connect to the appropriate ground depending on the measurement site.

  On the other hand, as an alternative to measuring the noise terminal voltage of the ground voltage, there is a method of measuring the line voltage of the power line. According to this method, since the line voltage is measured, the quality of the ground does not affect the measurement result. Moreover, an expensive spectrum analyzer is not required by measuring the peak voltage of the AC component that vibrates at the switching frequency using an inexpensive measuring instrument such as an oscilloscope.

"Switching power supply test method", created by the Technical Committee on Switching Power Supply Technology, Japan Electronics and Information Technology Industries Association, revised in November 2012, Internet <URL: http://www.jeita.or.jp/japanese/standard/ book / RC-9131C>

  However, a commercial power source (with a peak voltage of about 141 V in Japan) is connected between the power lines to be measured. Since the voltage range of the switching frequency to be evaluated is as wide as several meters to several tens of mV, if you try to measure it as it is, give the measuring instrument a resolution of 15 bits or more, or have an offset of 141 V or more and 10 mV / DIV It is necessary to set a measurement range of about. In addition, it is necessary for the measurer to have the technology to make full use of the above-mentioned oscilloscope range, offset switching, and trigger adjustment function. It takes about a minute.

  The present invention has been made paying attention to the above circumstances, and the purpose of the present invention is to make it easy to determine the state of deterioration of the power supply device without requiring an expensive measuring instrument and without requiring skill. It is an object of the present invention to provide a power supply device degradation measuring apparatus that can be evaluated in a short time.

In order to solve the above problems, a first aspect of the present invention is a degradation measurement of a power supply device that is arranged between a commercial power supply terminal and a power supply device to be measured and detects noise generated due to the degradation of the power supply device. A low-pass filter for attenuating a frequency component higher than the frequency of the commercial power supply voltage included in the commercial power supply voltage input from the commercial power supply terminal; and a commercial power supply between the low-pass filter and the power supply device A high-pass filter that separates and extracts the noise generated by the power supply device from the commercial power supply voltage, and a direct-current voltage generator that generates a direct-current voltage corresponding to the amplitude value of the noise extracted by the high-pass filter. wherein the DC voltage generating unit comprises a rectifier for rectifying the noise extracted by the high-pass filter, low capacitance value and the resistance value Both of them have a capacitance element and a resistance element that are configured to be variable, and the rectified waveform of the noise obtained by the rectification unit is smoothed according to a time constant determined by the capacitance value of the capacitance element and the resistance value of the resistance element. to, and is characterized in Rukoto a smoothing circuit unit which generates the DC voltage.

According to a second aspect of the present invention , there is provided a deterioration measuring apparatus for a power supply device that is arranged between a commercial power supply terminal and a power supply device to be measured and detects noise generated due to the deterioration of the power supply device. A low-pass filter for attenuating a frequency component higher than the frequency of the commercial power supply voltage included in the commercial power supply voltage input from the power supply terminal, and a commercial power supply line between the low-pass filter and the power supply device, by the power supply device A high-pass filter that separates and extracts the generated noise from the commercial power supply voltage; a direct-current voltage generator that generates a direct-current voltage according to an amplitude value of the noise extracted by the high-pass filter; the low-pass filter and the power supply The noise generated with the deterioration of the power supply device from the commercial power supply voltage or the commercial power supply current flowing through the commercial power supply line to the device. Characterized means for identifying the occurrence period of drawing, the only identified generation period of the noise, in that it comprises means for causing the generation of the DC voltage corresponding to the amplitude value of the noise to the DC voltage generator It is what.

According to a third aspect of the present invention , there is provided a deterioration measuring apparatus for a power supply device that is arranged between a commercial power supply terminal and a power supply device to be measured and detects noise generated due to deterioration of the power supply device. A low-pass filter for attenuating a frequency component higher than the frequency of the commercial power supply voltage included in the commercial power supply voltage input from the power supply terminal, and a commercial power supply line between the low-pass filter and the power supply device, by the power supply device A high-pass filter that separates and extracts the generated noise from the commercial power supply voltage; a direct-current voltage generator that generates a direct-current voltage according to an amplitude value of the noise extracted by the high-pass filter; the low-pass filter and the power supply The noise generated with the deterioration of the power supply device from the commercial power supply voltage or the commercial power supply current flowing through the commercial power supply line to the device. It means for identifying the occurrence period of drawing, the only identified generation period of the noise, and means for causing the generation of the DC voltage corresponding to the amplitude value of the noise to the DC voltage generator, the DC The voltage generation unit includes a rectification unit that rectifies noise extracted by the high-pass filter, and a capacitance element and a resistance element that are configured to be capable of changing at least one of a capacitance value and a resistance value, and are obtained by the rectification unit. and the rectified waveform of the noise, smoothes accordance a time constant determined by the resistance value of the capacitance value and the resistance element of the capacitor, is characterized in Rukoto a smoothing circuit section for generating the DC voltage .

  The fourth aspect of the present invention is characterized by further comprising means for outputting information representing a DC voltage corresponding to the amplitude value of the noise generated by the DC voltage generator.

  According to a fifth aspect of the present invention, the DC voltage generated by the DC voltage generator is compared with a DC voltage corresponding to the amplitude value of the noise and a value representing a preset normal range, and information indicating the comparison result Is further provided with means for outputting.

According to the first , second, and third aspects of the present invention, it is possible to measure noise generated by the deterioration of the power supply device as a DC voltage value corresponding to the amplitude. For this reason, it becomes possible to use a simple measuring device such as a tester for measuring a DC voltage, and an expensive spectrum analyzer for measuring noise itself can be dispensed with. Further, it becomes possible to measure noise even if the measurer is not proficient in handling the measuring device, and noise can be measured easily and in a short time.

According to the first and third aspects of the present invention, after the noise extracted by the high-pass filter is rectified by the rectifying unit, the variable capacitance element and the variable capacitance element and the variable resistance element are The DC voltage is generated by smoothing according to a time constant determined by the capacitance value and resistance value of the variable resistance element. Therefore, it is possible to generate a DC voltage with an appropriate time constant according to the noise frequency.

According to the second and third aspects of the present invention, the noise component includes a component that is not correlated with the deterioration of the power supply device, and even when the component is larger than the component correlated with the deterioration of the power supply device, It is possible to extract only components having a correlation with the deterioration of the power supply device and measure the DC voltage value. Therefore, it becomes possible to evaluate deterioration of the power supply device more accurately.

  According to the fourth aspect of the present invention, by providing means for outputting information representing the DC voltage generated by the DC voltage generator, the DC voltage corresponding to the amplitude of the noise is displayed on the display, for example. It is possible to wirelessly transmit and display on other terminals. This eliminates the need for the measurer to measure the DC voltage value of noise using a tester or the like, thereby reducing the work load on the measurer.

  According to the fifth aspect of the present invention, it is determined whether or not the DC voltage generated by the DC voltage generator is within the normal range, and the result is output. For this reason, the measurer does not need to evaluate himself / herself for the deterioration of the power supply device based on the direct-current voltage value, thereby further reducing the work load on the measurer.

  That is, according to the present invention, it is possible to evaluate the degree of deterioration of the power supply apparatus in a short time without requiring an expensive measuring instrument and without requiring skill. An apparatus can be provided.

The block diagram which shows the structure of the degradation measuring apparatus of the power supply device which concerns on 1st Embodiment of this invention. The block diagram which shows the structure of the degradation measuring apparatus of the power supply device which concerns on 2nd Embodiment of this invention. The figure for using it for operation | movement description of the degradation measuring apparatus of the power supply device shown in FIG.

Embodiments according to the present invention will be described below with reference to the drawings.
[First Embodiment]
(Constitution)
FIG. 1 is a block diagram showing the configuration of a power supply device degradation measuring apparatus according to a first embodiment of the present invention. Denotes an AC adapter that is a power supply device to be measured, and 3 denotes an electronic device as a load. The electronic device 3 is composed of, for example, a personal computer or a router. The AC adapter 2 generates a predetermined DC power supply voltage DC based on the commercial power supply voltage AC100V (50 Hz / 60 Hz) and supplies it to the electronic device 3.

  A deterioration measuring device 4 is connected between the commercial power plug 1 and the AC adapter 2. The degradation measuring device 4 includes a low-pass filter 41, a high-pass filter 42, an amplitude amplifying unit 43, a rectifying unit 44, and a charge storage unit 45.

  The low-pass filter 41 is inserted in series between the commercial power plug 1 and the AC adapter 2 and blocks high frequency components higher than the commercial power frequency (50 Hz / 60 Hz). Other electric devices and the like are also connected to the commercial power supply system, and noise generated by these electric devices may be superimposed on the commercial power supply voltage. The low-pass filter 41 prevents noise generated from the other electric devices from being input to the AC adapter 2 via the commercial power supply system.

  The high-pass filter 42 is branched and connected to the commercial power line, attenuates frequency components below the commercial power frequency (50 Hz / 60 Hz), and passes higher frequency components than the commercial power frequency. Among the high frequency components to be passed, noise components generated due to deterioration of the circuit devices in the AC adapter 2 are included.

  The amplitude amplifying unit 43 amplifies a noise component included in the high frequency component that has passed through the high pass filter 42. The amplitude of the noise component is considered to be about 10 mV to 100 mV for an AC adapter having a DC output of about 10 W to several tens of watts. In order to convert the amplitude of this noise component into a DC voltage, it is necessary to rectify by a rectifying element such as a diode. However, since the threshold voltage of the rectifying element is generally about several hundred mV, rectification cannot be performed as it is. Therefore, the amplitude amplifying unit 43 amplifies the amplitude of the noise component to about several volts so that the rectifying unit 44 can rectify the amplitude.

  The rectifying unit 44 rectifies the noise component amplified by the amplitude amplifying unit 43 using a rectifying circuit including a rectifying element such as a diode. The charge storage unit 45 is constituted by, for example, a parallel circuit of a capacitor and a resistor, and obtains a DC voltage by smoothing the noise component rectified by the rectification unit 44. The parallel circuit of the capacitor and the resistor can change at least one of the capacitance and the resistance value. By adjusting these circuit constants and setting the time constant to an arbitrary value, the noise component can be rectified. It is possible to set how long the subsequent amplitude is smoothed (averaged).

  The charge storage unit 45 is provided with an output terminal (not shown), and for example, a tester can be connected to the output terminal.

(Operation)
With this configuration, the noise component generated from the primary smoothing capacitor in the AC adapter 2 superimposed on the commercial power supply voltage is separated and extracted from the commercial power supply voltage by the high-pass filter 42 in the degradation measuring device 4. . The separated and extracted noise component is amplified to an amplitude value necessary for rectification by the amplitude amplifying unit 43, then rectified by the rectifying unit 44, and further smoothed by the charge storage unit 45 and converted into a DC voltage. The

  Therefore, for example, a tester is connected to the output terminal provided in the charge storage unit 45 to measure the DC voltage value of the noise component, and the measurer compares the measured DC voltage value of the noise component with a normal value. Thus, it is possible to evaluate the deterioration of the AC adapter 2. As the normal value, a DC voltage value of a noise component measured when the AC adapter 2 is new may be used.

(effect)
As described in detail above, in the power supply device deterioration measuring apparatus 4 according to the first embodiment, the noise component generated by the deterioration of the AC adapter 2 is extracted from the commercial power supply line through the high-pass filter 42, and the amplitude of this noise component is calculated. After being amplified to a value that can be rectified by the amplitude amplifying unit 43, it is converted into a DC voltage by the rectifying unit 44 and the charge storage unit 45 and output from the output terminal.

  Therefore, it is possible to measure the voltage value of the noise component generated by the characteristic deterioration of the primary smoothing capacitor from the AC adapter 2 as a DC voltage value. This eliminates the need for an expensive spectrum analyzer and allows the measurer to handle the oscilloscope. The noise component can be measured even if the user is not familiar with the above. Further, since it is not necessary to switch the range and offset and adjust the trigger as in the case of using an oscilloscope, the time required for measurement can be shortened.

[Second Embodiment]
The noise superimposed on the commercial power line from the AC adapter 2 includes not only a component that has a correlation with the deterioration of the AC adapter 2 but also a component that has no correlation with the deterioration of the AC adapter 2. May be larger than the correlated components. In this case, in the configuration shown in the first embodiment, the DC voltage value of the noise component smoothed by the charge storage unit 45 is dominated by a component that has no correlation with the deterioration of the AC adapter 2, and as a result, the AC adapter 2 There is a risk that it will be difficult to confirm the deterioration of the material.

  As a result of investigation, the inventor has found that noise that has no correlation with the deterioration of the AC adapter 2 occurs when the commercial power supply current starts and ends, and the noise that has a correlation with the deterioration of the AC adapter 2 is generated by the commercial power supply current. The knowledge that it often occurs in the flowing period was obtained.

  Therefore, in the second embodiment of the present invention, the commercial power supply current is monitored, and only the period in which noise having a correlation with the deterioration of the AC adapter 2 is generated is set as the noise voltage measurement period.

  FIG. 2 is a block diagram showing a configuration of a power supply device deterioration measuring apparatus according to the second embodiment of the present invention. In the figure, the same parts as those in FIG.

  The degradation measuring device 5 includes a commercial power supply voltage / current monitoring unit 46 and a switch 47 in addition to the low-pass filter 41, the high-pass filter 42, the amplitude amplification unit 43, the rectification unit 44, and the charge storage unit 45. The switch 47 is a semiconductor switch, and is disposed between the amplitude amplifying unit 43 and the rectifying unit 44. The commercial power supply voltage / current monitoring unit 46 detects the commercial power supply current flowing through the commercial power supply line, compares it with a preset threshold value, and conducts the switch 47 only during a period when the absolute value of the commercial power supply current exceeds the threshold value. The threshold value is set to the minimum value of the commercial power supply current that flows during a period in which noise having a correlation with the deterioration of the AC adapter 2 is occurring.

(Operation)
Next, the operation of the deterioration measuring apparatus 5 configured as described above will be described. FIG. 3 is a waveform diagram for explaining the operation, where Iw represents the waveform of the commercial power supply current, Ew represents the waveform of the commercial power supply voltage, and T represents the half cycle of the commercial power supply.
As shown in FIG. 3, the noise component Nw superimposed on the commercial power line from the AC adapter 2 includes a noise component Nwb correlated with the deterioration of the AC adapter 2, and a noise component Nwa uncorrelated with the deterioration of the AC adapter 2. It is included. Of these, the noise component Nwa that has no correlation with the deterioration of the AC adapter 2 occurs when the commercial power supply current starts and ends, and the noise component Nwb that has a correlation with the deterioration of the AC adapter 2 has a predetermined commercial power supply current. Occurs during the period when the value is flowing.

  In the deterioration measuring apparatus according to the second embodiment, the amplitude of the commercial power supply current is monitored by the commercial power supply voltage / current monitoring unit 46, and the switch 47 is turned on only during a period when the commercial power supply current value exceeds the threshold value. At this time, the threshold value is set to the minimum value of the commercial power supply current that flows during the period in which the noise component Nwb having a correlation with the deterioration of the AC adapter 2 is generated as described above. For this reason, only the noise component Nwb correlated with the deterioration of the AC adapter 2 among the noise components amplified by the amplitude amplifying unit 43 passes through the switch 47 and is input to the rectifying unit 44 and rectified by the rectifying unit 44. After that, it is smoothed by the charge storage unit 45 and converted into a DC voltage value.

  Therefore, if a tester is connected to the output terminals provided at both ends of the charge storage unit 45, the DC voltage value of the noise component Nwb having a correlation with the deterioration of the AC adapter 2 can be measured.

(effect)
As described above in detail, according to the second embodiment, the noise component includes the noise component Nwa that has no correlation with the deterioration of the AC adapter 2, and the noise component Nwa has a correlation with the deterioration of the AC adapter 2. Even when the noise component is larger than the noise component Nwb, it is possible to extract only the noise component Nwb correlated with the deterioration of the AC adapter 2 and measure the DC voltage value. Therefore, it becomes possible to evaluate the deterioration of the AC adapter 2 more accurately.

  Further, since the switch 47 is disposed between the amplitude amplifying unit 43 and the rectifying unit 44, it is possible to prevent a problem that noise caused by the on / off of the switch 47 is mixed into the measurement result. Note that the switch 47 can be disposed between the high-pass filter 42 and the amplitude amplifying unit 43, or between the rectifying unit 44 and the charge accumulating unit 45. Of these, the high-pass filter 42, the amplitude amplifying unit 43, The switching noise of the switch 47 is amplified by the amplitude amplifying unit 43, and the influence of the switching noise on the measurement result is increased. Further, if the switch 47 is disposed between the rectifying unit 44 and the charge storage unit 45, the switching noise directly affects the smoothing process by the charge storage unit 45, so that the DC voltage value becomes unstable.

[Other Embodiments]
In each of the above-described embodiments, the case where a function for obtaining a DC voltage value of the noise component Nwb generated due to deterioration of the AC adapter 2 is provided is described as an example. However, the present invention is not limited to this, and an indicator for displaying the DC voltage value of the noise component Nwb is provided in the degradation measuring devices 4 and 5, and the DC voltage value of the noise component Nwb is compared with a normal value. The information indicating the comparison result may be displayed on the display.

  Further, the degradation measuring devices 4 and 5 are provided with a wireless interface function, and the wireless interface function allows the DC voltage value of the noise component Nwb and information indicating the comparison result between the DC voltage value of the noise component Nwb and the normal value to be displayed by the user. Alternatively, it may be transmitted to a personal computer of a maintenance manager and displayed.

  In the second embodiment, the commercial power supply current value is monitored by the commercial power supply voltage / current monitoring unit 46, but the commercial power supply voltage value may be monitored instead. In this case, the phase relationship between the commercial power supply current amount and the commercial power supply voltage may be examined in advance, and the switch 47 may be configured to conduct only when the commercial power supply current is flowing in a phase greater than a certain threshold.

In addition, the position and configuration of the deterioration measuring device can be variously modified and implemented without departing from the gist of the present invention.
In short, the present invention is not limited to the above-described embodiments as they are, and can be embodied by modifying the components without departing from the scope of the invention in the implementation stage. Moreover, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the above embodiments. For example, some components may be deleted from all the components shown in each embodiment. Furthermore, you may combine suitably the component covering different embodiment.

  DESCRIPTION OF SYMBOLS 1 ... Commercial power plug, 2 ... AC adapter, 3 ... Electronic equipment, 4 ... Degradation measuring device, 41 ... Low pass filter, 42 ... High pass filter, 43 ... Amplitude amplification part, 44 ... Rectification part 44 ... Charge storage part, 46 ... Commercial power supply voltage / current monitoring unit, 47... Switch.

Claims (5)

A degradation measuring device for a power supply device that is arranged between a commercial power supply terminal and a power supply device to be measured, and detects noise generated with the degradation of the power supply device,
A low-pass filter that attenuates a frequency component higher than the frequency of the commercial power supply voltage included in the commercial power supply voltage input from the commercial power supply terminal;
A high-pass filter that separates and extracts the noise generated by the power supply device from the commercial power supply voltage from a commercial power supply line between the low-pass filter and the power supply device;
A DC voltage generation unit that generates a DC voltage according to the amplitude value of the noise extracted by the high-pass filter ,
The DC voltage generator is
A rectifying unit that rectifies noise extracted by the high-pass filter;
A capacitance element and a resistance element configured to be capable of varying at least one of a capacitance value and a resistance value; A smoothing circuit unit that generates the DC voltage by smoothing according to a time constant determined by
An apparatus for measuring deterioration of a power supply device, comprising: A degradation measuring device for a power supply device that is arranged between a commercial power supply terminal and a power supply device to be measured, and detects noise generated with the degradation of the power supply device,
A low-pass filter that attenuates a frequency component higher than the frequency of the commercial power supply voltage included in the commercial power supply voltage input from the commercial power supply terminal;
A high-pass filter that separates and extracts the noise generated by the power supply device from the commercial power supply voltage from a commercial power supply line between the low-pass filter and the power supply device;
A DC voltage generator that generates a DC voltage according to the amplitude value of the noise extracted by the high-pass filter;
Means for specifying the generation period of the noise generated with deterioration of the power supply device from a commercial power supply voltage or a commercial power supply current flowing through a commercial power supply line between the low-pass filter and the power supply device;
Means for causing the DC voltage generator to generate a DC voltage corresponding to the amplitude value of the noise only during the specified noise generation period;
An apparatus for measuring deterioration of a power supply device, comprising: Means for specifying the generation period of the noise generated with deterioration of the power supply device from a commercial power supply voltage or a commercial power supply current flowing through a commercial power supply line between the low-pass filter and the power supply device;
According to claim 1, characterized in that the generation period of the identified said noise only, and means for causing the generation of the DC voltage corresponding to the amplitude value of the noise to the DC voltage generator further comprises Deterioration measuring device for power supply equipment.   4. The power supply device according to claim 1, further comprising means for outputting information representing a DC voltage corresponding to an amplitude value of the noise generated by the DC voltage generation unit. 5. Deterioration measuring device.   A means for comparing the DC voltage generated by the DC voltage generation unit according to the amplitude value of the noise with a value representing a preset normal range and outputting information representing the comparison result; The deterioration measuring apparatus for a power supply device according to any one of claims 1 to 4.