JP2016201934A - Deterioration detection device and deterioration detection method of power supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely detect a deterioration of a power supply device by recognizing a precursor of a deterioration of a smoothing capacitor of an auxiliary power supply circuit before occurence of a situation in which the power supply device cannot be activated.SOLUTION: A deterioration detection device for detecting a deterioration of a direct current power supply device having an auxiliary power supply circuit for rectifying and smoothing voltage inducted by an auxiliary coil of a transformer to generate an operation power supply voltage includes: a terminal block provided with a terminal to which the input voltage and the output voltage of the direct current power supply device are applied; rising timing detection means which can detect the rising timing of the input voltage and the output voltage; timing means which can time a power supply startup delay time until the output voltage is started; measurement value information application means which can store or set the existing power supply startup delay time that has already been acquired by the timing means; and determination means which compares the power supply startup delay time timed by the timing means with the existing power supply startup delay time applied from the measurement value information application means, and detects that the power supply startup delay time has changed from decease to increase to determine deterioration.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a technique effective for use in detecting deterioration of an insulation type DC power supply device including a transformer, particularly a low voltage power supply device.

In recent years, various types of electronic devices are mounted on railcars, and a low-voltage power supply device is also mounted as a power supply device that supplies power to these electronic devices.
While power supply devices are required to stably supply power to various electronic devices, it is difficult to grasp the deterioration state of power supply devices. As deterioration progresses, power supply devices cannot start up, and power is supplied to electronic devices. Since there is a possibility that a situation in which the power supply cannot be performed may occur, development of a technique for detecting deterioration of the power supply device is desired.

  By the way, the deterioration of the low voltage power supply device mounted on the railway vehicle is often caused by an aluminum electrolytic capacitor constituting the auxiliary power supply device provided in the power supply device. Therefore, an invention for detecting or discriminating deterioration of an aluminum electrolytic capacitor has been conventionally proposed as detection of deterioration of a power supply device. Examples of such an invention include those disclosed in Patent Document 1 and Patent Document 2.

JP 63-165770 A JP 2004-320870 A

Among the prior inventions, the invention relating to the electrolytic capacitor deterioration detection circuit disclosed in Patent Document 1 pays attention to the fact that the amplitude of the ripple voltage of the electrolytic capacitor gradually increases. The deterioration is detected by comparing with a threshold value.
However, although it is known that the lifetime of an electrolytic capacitor depends on electrical conditions (use environment) such as temperature, humidity, and vibration, each power supply device is disclosed in Patent Document 1 because the use situation is different. In the method of uniformly determining with the same threshold value as in the electrolytic capacitor deterioration detection circuit, there is a problem that it is difficult to determine the optimal deterioration according to the characteristics of each capacitor.

On the other hand, the electrolytic capacitor degradation determination device disclosed in Patent Document 2 counts the cumulative operating time corresponding to the ambient temperature used, and determines the lifetime based on this count value.
Although the determination method of the invention disclosed in Patent Document 2 has an advantage of being able to make a determination according to the usage status of the power supply device, a circuit for counting the cumulative operating time, a determination circuit, and a memory for storing the count value Since the device is necessary, there are problems that the number of parts constituting the device is large and the cost is increased, and if the count value stored in the storage device is lost for some reason, accurate life determination cannot be performed.

  The present invention has been made in order to solve the above-described problems. Before the occurrence of the situation where the power supply device cannot be started up, the deterioration of the power supply device can be reliably detected by detecting the signs of deterioration of the smoothing capacitor of the auxiliary power supply circuit. It is an object of the present invention to provide a deterioration detection device and a deterioration detection method that can be detected easily.

In order to solve the above problems, the present invention provides:
A transformer for voltage conversion, a switching element for intermittently passing a current through the primary winding of the transformer, a voltage proportional to the current flowing through the primary winding of the transformer, and a secondary side of the transformer A power supply control circuit that generates and outputs a drive pulse for controlling on / off of the switching element by inputting an output voltage detection signal, and a smoothing capacitor, rectifies the voltage induced in the auxiliary winding of the transformer In a deterioration detection device that detects deterioration of an insulation type DC power supply device having an auxiliary power supply circuit that generates an operating power supply voltage of the power supply control circuit by smoothing,
A terminal block having terminals to which the input voltage and the output voltage acquired from the DC power supply device are applied separately;
Rising detection means capable of detecting the rising timing of each of the input voltage and the output voltage applied to the terminal;
Based on the detection result by the rise detection means, the clock means capable of timing the power supply start delay time from the rise of the input voltage to the rise of the output voltage;
Measurement value information providing means capable of storing or setting the already-started power-on delay time already acquired by the time measuring means,
When the power supply start delay time measured by the time measuring means is compared with the existing power supply start delay time given from the measurement value information giving means, and when it is detected that the power start delay time has changed from decrease to increase, Determining means for determining that the DC power supply device is deteriorated;
Is provided.

  According to the deterioration detection device having the above-described configuration, it is possible to detect the deterioration of the power supply device by detecting a sign of the deterioration of the smoothing capacitor of the auxiliary power supply circuit before the situation where the power supply device cannot be started up. In addition, since the power supply startup delay time is affected by the characteristics of the smoothing capacitors of each power supply device, by determining the deterioration by detecting the conversion point where the power supply startup delay time turns from decreasing to increasing, respectively, An accurate determination result according to the usage status of the power supply apparatus can be obtained. In addition, since deterioration can be detected without providing a storage device that stores the accumulated operating time, the measurement value stored in the storage device may be lost for some reason and an accurate life determination cannot be performed. Thus, it is possible to reliably detect the deterioration of the power supply device and to configure the deterioration detection device at a low cost.

Preferably, the terminal block includes a terminal to which the operation power supply voltage generated by the auxiliary power supply circuit and supplied to the power supply control circuit is applied.
The time measuring means can time the control circuit operation start time from the time when the input voltage rises to the time when the operating power supply voltage reaches a predetermined level,
The determination means can determine that the DC power supply device has deteriorated when a control circuit operation repetition time, which is a difference between the power supply activation delay time and the control circuit operation start time, exceeds a predetermined time. Configure to be.
According to such a configuration, it is possible to determine that the DC power supply device has deteriorated when the control circuit operation repetition time exceeds a predetermined time set in advance, so even if the previous measurement value is missing or lost, the deterioration determination is made. The result can be obtained.

Further preferably, the determination means includes:
A first determination mode for determining that the DC power supply device is deteriorated when the power supply activation delay time is changed from decrease to increase;
A second determination mode for determining that the DC power supply device is deteriorated when the control circuit operation repetition time exceeds a predetermined time set in advance;
And is configured to be able to execute the determination by operating in one of the first determination mode and the second determination mode.
This makes it possible to determine that the power supply device has deteriorated when the power-on delay time has changed from decrease to increase, and to determine that the power supply device has deteriorated when the control circuit operation repetition time exceeds a preset time. Since any one of the modes to be selected can be selected, the determination mode can be properly used according to the type and usage status of the power supply device to be detected, and a highly convenient deterioration detection device can be realized.

Furthermore, it is desirable to comprise a mode switching means for setting whether the determination means operates in the first determination mode or the second determination mode.
Thereby, the determination mode which a deterioration detection apparatus performs can be selected easily from the outside.

In addition, another invention of the present application is proportional to a voltage conversion transformer, a switching element for passing a current intermittently through the primary winding of the transformer, and a current flowing through the primary winding of the transformer. A power supply control circuit for generating and outputting a drive pulse for controlling on and off of the switching element by inputting a voltage and an output voltage detection signal from the secondary side of the transformer, and a smoothing capacitor. In a deterioration detection method for detecting deterioration of an insulated DC power supply device having an auxiliary power supply circuit that rectifies and smoothes a voltage induced in the auxiliary winding to generate an operation power supply voltage of the power supply control circuit,
A first time measuring step of measuring a control circuit operation start time from the rise of the input voltage acquired from the DC power supply device until the operating power supply voltage reaches a predetermined level;
A second time measuring step of measuring a power supply activation delay time from the rise of the input voltage acquired from the DC power supply device to the rise of the output voltage of the DC power supply device;
A storage step of storing the power-on delay time measured by the second timing step as a previous measurement value;
A first determination step of determining whether or not the control circuit operation repetition time measured by the first time measurement step exceeds a predetermined time set in advance;
A second determination step of comparing whether the power activation delay time measured in the second timing step is compared with the previous measurement value, and determining whether the power activation delay time has shifted from a decrease to an increase;
A deterioration determination step of determining deterioration of the power supply device based on the determination result of the first determination step and the determination result of the second determination step;
A determination result output step for outputting a determination result of the deterioration determination step;
It is made to have.

  According to the above-described method, it is possible to detect the deterioration of the power supply device by detecting a sign of the deterioration of the smoothing capacitor of the auxiliary power supply circuit before the situation where the power supply device cannot be started up. In addition, the detection of deterioration by detecting the phenomenon that the control circuit operation repetition time has exceeded a predetermined time set in advance and the phenomenon that the power-on delay time has changed from decreasing to increasing, and more accurate deterioration detection Is possible.

  According to the present invention, there is an effect that the deterioration of the power supply device can be reliably detected by detecting the sign of the deterioration of the smoothing capacitor of the auxiliary power supply circuit before the situation that the power supply device cannot be started up occurs. .

1 is a circuit configuration diagram showing a configuration example of a low-voltage power supply device as an example of a DC power supply device suitable for application of a deterioration detection device and a deterioration detection method for a DC power supply device according to the present invention. This figure shows how the input voltage, output voltage, and charging voltage of the smoothing capacitor change when the input voltage is turned on. (A) shows the change of each voltage in the new low-voltage power supply device, and (B) shows the low operating voltage for a long time. It is a figure which shows the change of each voltage in a voltage power supply device. It is a graph which shows the relationship between the operation time of a low voltage power supply device, IC operation start time Ts for power supply control, operation repetition time Tr at the time of start-up of power supply control IC, and power supply start delay time Td. It is a block diagram which shows one Example of the deterioration detection apparatus of the power supply device which concerns on this invention.

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a deterioration detection device and a deterioration detection method for a power supply device according to the present invention will be described with reference to the drawings.
First, the configuration of a low-voltage power supply device as an example of a suitable DC power supply device to which the power supply device deterioration detection device and the deterioration detection method according to the present invention are applied will be described with reference to FIG.

  A low voltage power supply device 10 shown in FIG. 1 includes a filter circuit 11 that is connected to an input terminal IN and blocks noise included in the input voltage Vin, a primary winding Np, a secondary winding Ns, and an auxiliary winding Nb. A voltage converting transformer 12 for converting the input voltage Vin input through the filter circuit 11 into a different voltage, and a FET (field effect transistor) connected in series with the primary winding Np of the transformer 12 And a power supply control circuit 13 that generates and outputs a signal GT for turning on and off the switching SW. The power supply control circuit 13 is formed as a semiconductor integrated circuit (hereinafter referred to as a power supply control IC).

In the low-voltage power supply device of this embodiment, a DC voltage such as DC100V is input to the input terminal IN. By connecting a rectifier circuit composed of a diode bridge to the subsequent stage of the filter circuit 11, an AC100V AC voltage is input to the input terminal IN. It is also possible to configure as an AC-DC converter to which such an AC voltage is input.
The secondary side of the transformer 12 is connected between a rectifying diode D2 connected in series with the secondary winding Ns, and between the cathode terminal of the diode D2 and the other terminal of the secondary winding Ns. The smoothing capacitor C2 is provided, and the primary side switching element SW is turned on and off, and an alternating current voltage is induced in the secondary side winding Ns by intermittently passing a current through the primary side winding Np. By rectifying and smoothing, a DC voltage Vout corresponding to the winding ratio between the primary winding Np and the secondary winding Ns is output. In a power supply device mounted on a railway vehicle, a low voltage power supply device that outputs a voltage such as 5 V or 24 V as an output voltage Vout is used.

  Furthermore, in the low-voltage power supply device 10 of the present embodiment, the output voltage detection circuit 14 for detecting the voltage value of the output voltage Vout on the secondary side of the transformer 12 and the output voltage detection circuit 14 connected to the detection A photodiode 15a is provided as a light-emitting side element of a photocoupler that transmits a signal corresponding to the voltage to the power supply control IC 13 on the primary side. On the primary side, a phototransistor 15b is provided as a light receiving side element of a photocoupler that is connected to the feedback terminal FB of the power supply control IC 13, is driven by the output voltage detection circuit 14, and transmits a signal to the feedback terminal FB. Based on the voltage fed back from the output voltage detection circuit 14 via the photocoupler, the power supply control IC 13 generates a signal GT for turning on / off the switching SW so that the output voltage Vout is constant. .

In the low-voltage power supply device of this embodiment, on the primary side of the transformer 12, there is a rectifying diode D0 connected in series with the auxiliary winding Nb, and between the cathode terminal of the diode D0 and the ground point GND. An auxiliary power supply circuit 16 including a smoothing capacitor C0 connected to the power supply IC 16 is provided, and a voltage rectified and smoothed by the auxiliary power supply circuit 16 is applied to the power supply voltage terminal VCC of the power supply control IC 13.
At the same time, a diode D1 and a resistor R1 are connected in series between the input terminal IN and the power supply terminal VCC of the power supply control IC 13. When the power is turned on, the input voltage Vin passes through the diode D1 and the resistor R1. Thus, the power supply control IC 13 is operated even when the power supply is started before the voltage is induced in the auxiliary winding Nb by charging the smoothing capacitor C0 connected to the power supply terminal VCC. It is configured to be able to. When the capacitor C0 is charged, the power supply control IC 13 starts a switching operation, and the voltage converted by the transformer 12 is output. When switching is started, a voltage is induced in the auxiliary winding, and thereafter, an operating voltage is supplied to the power supply control IC 13 by the auxiliary power supply circuit 16.

The diode D1 prevents current from flowing backward to the input terminal IN due to the voltage induced in the auxiliary winding Nb. The resistor R1 is composed of a high-resistance element, and prevents a current from flowing from the input terminal IN to the power supply terminal VCC of the power supply control IC 13 when a voltage starts to be supplied from the auxiliary power supply circuit 16 to the power supply voltage terminal VCC. Work.
In the low-voltage power supply device of FIG. 1, an aluminum electrolytic capacitor is used as the smoothing capacitor C0 constituting the auxiliary power supply circuit 16, and the deterioration (life) of the aluminum electrolytic capacitor is used to determine the deterioration of the power supply device. It is a big factor. Specifically, when an aluminum electrolytic capacitor deteriorates due to repeated operation of a low-voltage power supply device, the capacitance value gradually decreases, and after the input voltage is turned on, the time until the output voltage of the auxiliary power supply rises becomes long, and finally The output voltage will not rise. Therefore, it is necessary to replace the aluminum electrolytic capacitor with a new one before such a situation occurs, and it is effective to make a judgment by grasping a sign of deterioration as in this embodiment.

Next, how the inventors have developed the deterioration detection technology according to the present invention will be described.
In order to investigate in detail what kind of change has occurred in the phenomenon until the output voltage rises after the input voltage is turned on by repeated operation of the low-voltage power supply device, the present inventors have accelerated the low-voltage power supply device. The test was performed, and changes in the input voltage Vin, the output voltage Vout, and the charging voltage (output of the auxiliary power supply circuit) Vc of the smoothing capacitor (aluminum electrolytic capacitor) Cc immediately after the input voltage was applied were observed.

2A is a waveform diagram showing changes in Vin, the output voltage Vout, and the charging voltage Vc of the smoothing capacitor C0 in a new low-voltage power supply device, and FIG. 2B is a low-voltage power supply device used for a long time. It is a wave form diagram which shows the mode of the change of Vin, the output voltage Vout, and the charging voltage Vc of the capacitor | condenser C0 for smoothing.
As can be seen by comparing FIG. 2A and FIG. 2B, in the case of the new low-voltage power supply device of FIG. 2A, the smoothing capacitor C0 is charged to a predetermined voltage, and the power supply control IC 13 is When the operation is started, the output voltage Vout rises after a while, and then Vout is maintained at a constant voltage.

  On the other hand, in the case of the old low-voltage power supply device shown in FIG. 2B, even if the smoothing capacitor C0 is charged to a predetermined voltage and the power supply control IC 13 starts operating, the charge voltage Vc decreases, so that the startup fails. Then, after repeating this several times, it became clear that the output voltage Vout rose, and then Vout was maintained at a constant voltage. This is because when the smoothing capacitor C0 deteriorates, the amount of charge decreases, so even if the power supply control IC 13 starts operating once, the voltage of the capacitor decreases due to consumption of the charge charge, and the power supply control IC 13 performs switching control. It is because it cannot start. A period Tr in FIG. 2B is an operation repetition time when the power supply control IC 13 is activated, and this time is zero in FIG.

The operation start time Ts until the charging voltage Vc of the smoothing capacitor C0 first rises to a predetermined voltage (IC operation voltage) is higher than that of the new low-voltage power supply device of FIG. It can also be seen from the fact that the old low-voltage power supply is shorter.
Therefore, the present inventors conducted an acceleration test to determine a power supply start delay time Td from when the input voltage Vin rises to when the output voltage Vout rises, an IC operation start time Ts until the charge voltage Vc rises, The secular change of the operation repetition time Tr at the start-up of the power supply control IC 13 was examined. The result is shown in FIG.

In FIG. 3, the solid line A indicates the change in the IC operation start time Ts, the broken line B indicates the change in the operation repetition time Tr when the IC starts up, and the alternate long and short dash line C indicates that the input voltage Vin rises and the output voltage Vout rises. The state of change of the power supply activation delay time Td is shown. In FIG. 3, the power supply activation delay time Td is the sum of the IC operation start time Ts and the operation repetition time Tr during activation of the power supply control IC, that is, Td = Ts + Tr.
Accordingly, each of the times Td, Ts, and Tr may be obtained by measuring with a timer, but any two times, for example, the power-on delay time Td and the start-up operation repetition time Tr are measured to start the IC operation. The time Ts may be obtained by calculation using the equation Ts = Td−Tr.

  From FIG. 3, the operation repetition time Tr at the start-up of the power supply control IC suddenly increases from a certain point in time, and the power supply start delay time Td is initially shortened depending on the operation period, but is reversed after a certain period of time has elapsed. It turned out to increase. Therefore, when the start-up operation repetition time Tr is monitored and it is detected that the threshold value Th has been exceeded, it is determined that the deterioration has occurred, or the power-on start-up delay time Td is monitored to detect that it has reversed from decrease to increase. In this case, the conclusion was reached that it should be judged as degraded. Even if such an event occurs, the power supply can still start up. At this point, replacing the smoothing capacitor of the auxiliary power supply circuit with a new one causes a situation where the power supply cannot suddenly start up. Can be avoided.

The present invention has been made based on the above findings. Embodiments of a power supply device degradation detection device and degradation detection method according to the present invention will be described below.
FIG. 4 shows an embodiment of a power supply device deterioration detection device according to the present invention.
The deterioration detection device 20 of this embodiment is operated according to a base board B1 having a terminal block 21 to which a terminal of a cable for connection to a low voltage power supply device to be detected is coupled, and a deterioration detection program, and is low in detection target. A microcomputer board B2 having a data processing device 25 such as a one-chip microcomputer that detects time based on a voltage input from the voltage power supply device to the base board B1 and determines deterioration, and supplies a power supply voltage to each board. A battery 31, a power on / off switch 32, a display lamp 33 including an LED (light emitting diode) for displaying an operation state, a display switching slide switch 34, a mode switching switch 35 for switching a judgment mode, and the like are provided. .

  In addition to the terminal block 21, the base board B1 includes a photocoupler 22 for transmitting a voltage acquired from the low voltage power supply device to be detected to the data processing device 25 on the microcomputer board B2 via the terminal block 21 and a cable. An operational amplifier (amplifier) 23 that amplifies the acquired voltage and inputs it to the data processing device 25, a rotary switch 24 for setting detection conditions, and the like are mounted. The data processing device 25 includes an AD converter, and converts an analog signal input from the operational amplifier (amplifier) 23 into digital data. The set value of the rotary switch 24 is input to the data processor 25 as, for example, 12-bit parallel data.

  On the other hand, on the microcomputer board B2, in addition to the data processing device 25, a display device 26 such as an LCD (Liquid Crystal Panel) for displaying determination results and the like is mounted. In this embodiment, the terminal block 21 is provided with three terminals, and these terminals are connected to the input voltage Vin and output voltage Vout of the low-voltage power supply device to be detected and the charging voltage of the smoothing capacitor C0 via a cable. Vc is applied. The one-chip microcomputer constituting the data processing device 25 has a built-in ROM (read-only memory: read-only memory), a deterioration detection program is stored in the ROM, and operates according to the program.

  The deterioration detection device 20 of this embodiment has a timing (t1 in FIG. 2B) when the input voltage Vin acquired from the low-voltage power supply device to be detected and supplied to the base board B1 rises, and the smoothing capacitor C0. The timing at which the charging voltage Vc increases to the predetermined voltage Von (t2 in FIG. 2 (B)) and the timing at which the output voltage Vout rises (t3 in FIG. 2 (B)) are detected. The data processing device 25 is configured to have a timer function for measuring time (IC operation start time Ts) and time t1 to t3 (power activation delay time Td).

When the above-described deterioration detection device is configured to be portable, the base board B1, the microcomputer board B2, and the battery 31 among the above components are built in the case of the deterioration detection device, and the terminal block 21, the power supply The on / off switch 32, the status display lamp 33, the display switching slide switch 34, and the determination mode switching switch 35 can be mounted on the case so that a part thereof is exposed on the surface of the case to constitute the apparatus. .
In addition, in the case of a method of detecting deterioration by determining the conversion point of the power-on delay time Td, an EEROM (electrically erasable and programmable read / write) connected to the microcomputer for storing the previous measurement value is used. A non-volatile memory 27 such as an only memory (a read-only memory that can be electrically written and erased) may be provided. However, in the deterioration detection device, the memory 27 can be omitted by setting the previous measurement value in the rotary switch 24. The deterioration detection device can be configured as a built-in device that can be built in a low-voltage power supply device or a portable device.

  Furthermore, although the battery 31 is provided in the deterioration detection device shown in FIG. 4, the deterioration detection device according to the present invention detects deterioration by detecting a sign of deterioration before a situation where the power supply device cannot start up occurs. Therefore, in the case of a built-in type, it is possible to omit the battery 31 by configuring the power supply device to receive power supply voltage from the detection target power supply device. In this case, for example, an electrolytic capacitor connected to the auxiliary winding of the transformer 12 is separately provided for the detection device, so that it can be configured to operate by receiving power supply from the primary side of the transformer.

Next, each of the two determination modes executed by the deterioration detection device 20 of the present embodiment by switching the mode changeover switch 35 will be described.
The first determination mode is a mode in which deterioration is determined when the operation repetition time Tr of the power supply control IC 13 exceeds a preset threshold value Th. The second determination mode is a mode for determining deterioration when the power supply activation delay time Td has changed from decrease to increase, that is, when a conversion point is detected.

The threshold value Th used in the first determination mode is stored in a ROM built in a one-chip microcomputer as the data processing device 25, and can be implemented by comparing with the time measured this time. it can. On the other hand, in the case of the second determination mode, the measured time is stored in the non-volatile memory, and compared with the previous measurement time or the set value of the rotary switch 24 at the time of the next determination, It is possible to detect the conversion to increase. As described above, the setting value of the rotary switch 24 may be a previous measurement value, or a detection condition prepared in advance may be used as the setting value.
In the second determination mode, deterioration detection is realized by monitoring the input / output voltage change timing from the outside without any special additions or changes to the AVR (low voltage power supply). it can. That is, it can be applied to existing general AVR.

In the deterioration detection apparatus of the above embodiment, the mode for determining deterioration when the operation repetition time Tr of the power supply control IC 13 exceeds a preset threshold Th and the power supply activation delay time Td increase from a decrease. It has been described that it is equipped with a mode that determines that it has deteriorated when it is detected that it has been converted to, and it can be selected with the mode selector switch to operate in which determination mode, but it operates only in one of the determination modes It is also possible to configure as a deterioration detecting device.
Further, a function for determining whether or not the power activation delay time Td has been converted from decrease to increase and a function for determining whether or not the operation repetition time Tr has exceeded a preset threshold Th are provided. You may make it determine with deterioration by taking the logical product of a result. Further, the above-described three determination modes may be provided in the deterioration detection device, and the deterioration detection device may be configured to be operable in any one of the determination modes in response to a mode switch or an external command.

  Further, since the operation repetition time Tr and the operation start time Ts of the power supply control IC have different characteristics depending on the capacitor to be used, a mode in which a determination is made by detecting a conversion point of the power supply start delay time reflecting both characteristics. The determination result with higher accuracy is obtained. On the other hand, in order to implement this determination mode, a non-volatile memory for storing the previous measurement value is required, which increases the cost of the apparatus. Therefore, when configuring a deterioration detection device that operates in any one of the determination modes, the determination mode to be applied may be determined according to whether the cost is prioritized or the determination system is prioritized.

  As mentioned above, although this invention was demonstrated based on the Example, this invention is not limited to the said Example. For example, in the above embodiment, the power supply device using the aluminum electrolytic capacitor as the smoothing capacitor constituting the auxiliary power supply circuit has been described. However, the power supply device using a capacitor other than the aluminum electrolytic capacitor may be applied. . Moreover, although the said Example demonstrated the case where it applied to the low voltage power supply device mounted in a railway vehicle, if it is a power supply device which uses an aluminum electrolytic capacitor, it will be a general low voltage power supply other than a railway vehicle mounting The present invention can also be applied to devices and AC-DC converters.

DESCRIPTION OF SYMBOLS 10 Low voltage power supply device 11 Filter circuit 12 Transformer 13 Power supply control circuit (IC for power supply control)
14 Output Voltage Detection Circuit 16 Auxiliary Power Supply Circuit 20 Deterioration Detection Device 21 Terminal Block 25 Data Processing Device

Claims (5)

A transformer for voltage conversion, a switching element for intermittently passing a current through the primary winding of the transformer, a voltage proportional to the current flowing through the primary winding of the transformer, and a secondary side of the transformer A power supply control circuit that generates and outputs a drive pulse for controlling on / off of the switching element by inputting an output voltage detection signal, and a smoothing capacitor, rectifies the voltage induced in the auxiliary winding of the transformer A deterioration detection device for detecting deterioration of an insulation type DC power supply device having an auxiliary power supply circuit that smoothes and generates an operation power supply voltage of the power supply control circuit,
A terminal block having terminals to which the input voltage and the output voltage acquired from the DC power supply device are applied separately;
Rising detection means capable of detecting the rising timing of each of the input voltage and the output voltage applied to the terminal;
Based on the detection result by the rise detection means, the clock means capable of timing the power supply start delay time from the rise of the input voltage to the rise of the output voltage;
Measurement value information providing means capable of storing or setting the already-started power-on delay time already acquired by the time measuring means,
When the power supply start delay time measured by the time measuring means is compared with the existing power supply start delay time given from the measurement value information giving means, and when it is detected that the power start delay time has changed from decrease to increase, Determining means for determining that the DC power supply device is deteriorated;
A deterioration detection device for a power supply device, comprising: The terminal block includes a terminal to which the operation power supply voltage generated by the auxiliary power supply circuit and supplied to the power supply control circuit is applied.
The time measuring means can time the control circuit operation start time from the time when the input voltage rises to the time when the operating power supply voltage reaches a predetermined level,
The determination means can determine that the DC power supply device has deteriorated when a control circuit operation repetition time, which is a difference between the power supply activation delay time and the control circuit operation start time, exceeds a predetermined time. The deterioration detection device for a power supply device according to claim 1, wherein The determination means includes
A first determination mode for determining that the DC power supply device is deteriorated when the power supply activation delay time is changed from decrease to increase;
A second determination mode for determining that the DC power supply device is deteriorated when the control circuit operation repetition time exceeds a predetermined time set in advance;
The deterioration detection device for a power supply device according to claim 2, further comprising a first determination mode and a second determination mode, wherein the determination can be performed.   4. The deterioration detection device for a power supply device according to claim 3, further comprising a mode switching unit for setting whether the determination unit operates in the first determination mode or the second determination mode. A transformer for voltage conversion, a switching element for intermittently passing a current through the primary winding of the transformer, a voltage proportional to the current flowing through the primary winding of the transformer, and a secondary side of the transformer A power supply control circuit that generates and outputs a drive pulse for controlling on / off of the switching element by inputting an output voltage detection signal, and a smoothing capacitor, rectifies the voltage induced in the auxiliary winding of the transformer A deterioration detection method for detecting deterioration of an insulation type DC power supply device having an auxiliary power supply circuit that smoothes and generates an operation power supply voltage of the power supply control circuit,
A first time measuring step of measuring a control circuit operation start time from the rise of the input voltage acquired from the DC power supply device until the operating power supply voltage reaches a predetermined level;
A second time measuring step of measuring a power supply activation delay time from the rise of the input voltage acquired from the DC power supply device to the rise of the output voltage of the DC power supply device;
A storage step of storing the power-on delay time measured by the second timing step as a previous measurement value;
A first determination step of determining whether or not the control circuit operation repetition time measured by the first time measurement step exceeds a predetermined time set in advance;
A second determination step of comparing whether the power activation delay time measured in the second timing step is compared with the previous measurement value, and determining whether the power activation delay time has shifted from a decrease to an increase;
A deterioration determination step of determining deterioration of the power supply device based on the determination result of the first determination step and the determination result of the second determination step;
A determination result output step for outputting a determination result of the deterioration determination step;
A method for detecting deterioration of a power supply device, comprising:

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