CN211603493U - DC power supply aging degree detection device - Google Patents
DC power supply aging degree detection device Download PDFInfo
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- CN211603493U CN211603493U CN201921421606.7U CN201921421606U CN211603493U CN 211603493 U CN211603493 U CN 211603493U CN 201921421606 U CN201921421606 U CN 201921421606U CN 211603493 U CN211603493 U CN 211603493U
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- 238000001514 detection method Methods 0.000 title claims abstract description 21
- 230000032683 aging Effects 0.000 title claims abstract description 15
- 238000005070 sampling Methods 0.000 claims abstract description 30
- 238000012806 monitoring device Methods 0.000 claims abstract description 5
- 239000003990 capacitor Substances 0.000 claims description 59
- 230000000087 stabilizing effect Effects 0.000 claims description 7
- 230000015556 catabolic process Effects 0.000 claims 3
- 238000006731 degradation reaction Methods 0.000 claims 3
- 238000012360 testing method Methods 0.000 abstract description 4
- 238000007599 discharging Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000005611 electricity Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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Abstract
The utility model discloses a DC power supply ageing degree detection device, including exchanging millivoltmeter, direct-current voltmeter, working power supply, direct current ammeter, sampling resistor, zener diode, selector switch, first electric capacity and load resistance, signal input part positive pole, first electric capacity, sampling resistor, direct current ammeter and signal input part negative pole are established ties in proper order, zener diode, sampling resistor and exchanging millivoltmeter's sample end is parallelly connected each other and is formed parallel circuit, load resistance connects in parallel in the series circuit that first electric capacity and sampling resistor establish ties into, and direct-current voltmeter's sample end is parallelly connected with monitoring devices's signal input part, and working power supply and exchanging millivoltmeter, direct-current voltmeter and direct-current ammeter's work power end are parallelly connected. The device detects the output ripple size of the power supply module through the test circuit, compares the output ripple size with a set threshold value, judges the aging degree of the switching power supply, ensures the normal operation of equipment, and improves the reliability of the equipment.
Description
Technical Field
The utility model relates to a power protection equipment especially relates to a DC power supply ageing testing arrangement.
Background
Compared with the traditional linear voltage-stabilized power supply, the switching power supply module has the advantages of small volume, high efficiency, low cost and high automation degree, and is widely applied to the field of industrial control. However, the switching power supply also has the obvious disadvantage of fast aging speed, which may bring hidden trouble to the power supply equipment. The direct current voltage output by the switching power supply is a series of pulse voltages with a certain duty ratio, and can be changed into smooth direct current voltage for load use only after being smoothed by the filter capacitor at the output end. After the capacitor is aged, the dielectric loss angle of the capacitor is greatly increased, so that the capacity of passing high-order alternating-current components is reduced, the capacitance of the capacitor is also reduced, and the discharge speed is increased. Therefore, once the filter capacitor of the switching power supply is aged, the increase of the fluctuation degree of the output voltage waveform of the switching power supply can be obviously seen, and the output ripple of the power supply module cannot be detected to judge the aging degree of the direct-current power supply in the prior art, so that the hidden danger caused by the aging of the switching power supply is difficult to effectively solve.
Disclosure of Invention
The utility model discloses mainly solve prior art and can't carry out the technical problem that detects to power module output ripple, provide a DC power supply degree of ageing detection device, detect power module's output ripple size through test circuit, judge switching power supply degree of ageing with setting for the threshold value comparison, guarantee equipment normal operating, improve equipment reliability.
The above technical problem of the present invention can be solved by the following technical solutions: the utility model discloses an exchange millivoltmeter, direct current voltmeter, working power supply, direct current ammeter, sampling resistor, zener diode, selector switch, first electric capacity and load resistance, signal input part positive pole, first electric capacity, sampling resistor, direct current ammeter and signal input part negative pole are established ties in proper order, zener diode, sampling resistor and the mutual parallelly connected parallel circuit that forms of the sample terminal of exchanging millivoltmeter, load resistance connects in parallel in the series circuit that first electric capacity and sampling resistor establish ties into, and the sample terminal of direct current voltmeter is parallelly connected with monitoring devices's signal input part, and working power supply is parallelly connected with the working power end of exchanging millivoltmeter, direct current voltmeter and direct current ammeter. The load resistor is used for providing different loads so as to compare the ripple value of the output voltage and accurately distinguish bad power modules. The voltage stabilizing diode is used for preventing the impulse current charged by the capacitor at the moment of meter access from damaging the alternating-current millivoltmeter. The first capacitor is used for isolating the direct current component so as to measure the alternating current component. The sampling resistor is used for discharging the conductance current of the capacitor and completing sampling. The alternating current millivoltmeter is used for measuring the ripple voltage.
Preferably, the circuit comprises a second capacitor, a selection switch is arranged between the first capacitor and the positive electrode of the signal input end, a stationary contact of the selection switch is connected with the positive electrode of the signal input end, two moving contacts of the selection switch are respectively connected with one end of the first capacitor and one end of the second capacitor, the other end of the second capacitor is connected with the other end of the first capacitor, and the capacities of the first capacitor and the second capacitor are different. The two capacitors have different capacities, so that voltage ripple values with different frequencies can be measured, one is used for measuring power frequency, and the other is used for measuring high frequency, and the detection effect is further improved.
Preferably, the working power supply comprises a solar panel and a storage battery. The working power supply generates electricity through the solar cell panel, the continuous working time of the detection device is prolonged, and the storage battery ensures the current stability of the detection device.
Preferably, the first capacitor and the second capacitor are electrolytic capacitors. The anode of the electrolytic capacitor is connected with the selection switch, and the cathode of the electrolytic capacitor is connected with the sampling resistor and used for dealing with high-frequency current.
Preferably, the resistance value of the load resistor is freely adjusted within 0 ohm to 200 ohm. The load resistor provides different loads for the detection circuit so as to compare the ripple value of the output voltage and accurately distinguish bad power modules.
The utility model has the advantages that: the output ripple magnitude of the power supply module is detected through the test circuit, and the aging degree of the switching power supply is judged by comparing the output ripple magnitude with a set threshold value, so that the normal operation of equipment is ensured, and the reliability of the equipment is improved.
Drawings
Fig. 1 is a circuit diagram of the present invention.
In the figure, 1 is an alternating-current millivoltmeter, 2 is a direct-current voltmeter, 3 is a working power supply, 4 is a direct-current ammeter, 5 is a sampling resistor, 6 is a voltage stabilizing diode, 7 is a first capacitor, 8 is a second capacitor, 9 is a load resistor, 10 is a selective switch, and 20 is a signal input end
Detailed Description
The technical solution of the present invention is further specifically described below by way of examples and with reference to the accompanying drawings.
Example (b): as shown in fig. 1, the device for detecting aging degree of a dc power supply of this embodiment includes an ac millivoltmeter 1, a dc voltmeter 2, a working power supply 3, a dc ammeter 4, a sampling resistor 5, a zener diode 6, a selection switch 10, a first capacitor 7, a second capacitor 8, and a load resistor 9. The voltage stabilizing diode 6, the sampling resistor 5 and the sampling end of the alternating-current millivoltmeter 1 are connected in parallel to form a parallel circuit, and the voltage stabilizing diode 6 is used for preventing the impact current of the meter connected to the instant capacitor for charging from damaging the alternating-current millivoltmeter; the sampling resistor 5 is used for discharging the conductance current of the capacitor and completing sampling; the alternating current millivoltmeter is used for measuring the ripple voltage. A selective switch 10 is arranged between a sampling resistor 1.5 and the positive pole of a signal input end 20, a static contact of the selective switch 10 is connected with the positive pole of the signal input end 20, two movable contacts of the selective switch 10 are respectively connected with a first capacitor 7 and a second capacitor 8, the first capacitor 7 and the second capacitor 8 are used for isolating a direct current component so as to measure an alternating current component, the capacities of the first capacitor 7 and the second capacitor 8 are different and are used for measuring voltage ripple values of different frequencies, one measuring power frequency and one measuring high frequency, the detection effect is further improved, a load resistor 9 is used for providing different loads for a detection circuit, the sizes of the voltage ripple values are compared, and bad power modules are accurately distinguished. The DC ammeter 4 is connected in series between the sampling resistor 5 and the negative electrode of the signal input end 20 of the monitoring device, and the sampling end of the DC voltmeter 2 is connected in parallel with the signal input end 20 of the detection device and is used for measuring the values of the DC current and the DC voltage. Working power supply 3 is parallelly connected with the work power end of exchanging millivoltmeter 1, direct-current voltmeter 2 and direct-current ammeter 4 for exchanging millivoltmeter 1, direct-current voltmeter 2 and direct-current ammeter 4 provide the power, working power supply 3 includes solar cell panel and battery, and working power supply 3 passes through the solar cell panel electricity generation, increases detection device's continuous operating time, and detection device's electric current stability has been guaranteed to the battery.
The direct current voltage output by the switching power supply is a series of pulse voltages with a certain duty ratio, and can be changed into smooth direct current voltage for load use only after being smoothed by the filter capacitor at the output end. After the capacitor is aged, the dielectric loss of the capacitor can be greatly increased, so that the capacity of the capacitor through high-order alternating current components is reduced, the capacitance of the capacitor is also reduced, the discharging speed is increased, the fluctuation degree of the output voltage waveform of the switching power supply is obviously increased once the filter capacitor is aged, and the aging degree of the direct-current power supply can be judged by detecting the output ripple wave size of the power supply module.
During operation, the first capacitor 7 and the second capacitor 8 are used for isolating direct current components, the load resistor 9 is added into the detection circuit to provide different loads for the detection circuit, the sampling resistor 5 is used for discharging the conductive current of the discharge container and completing sampling, and the ripple voltage can be measured through the alternating current millivoltmeter 1 which is connected with the sampling resistor 5 in parallel. Meanwhile, a voltage stabilizing diode 6 is added in the monitoring circuit and used for preventing the alternating-current millivoltmeter from being damaged by the impact current generated when the meter is connected into the capacitor to be charged instantly, and the first capacitor 7 and the second capacitor 8 are different in capacity and are respectively connected with two contacts of the selector switch and used for measuring voltage ripple values with different frequencies, one for measuring power frequency and one for measuring high frequency, so that the detection effect is further improved. The direct current meter 4 connected in series between the sampling resistor 1.5 and the negative electrode of the signal input end 10 of the monitoring device and the direct current voltmeter 2 connected in parallel with the signal input end 20 are used for measuring the direct current and direct current voltage values.
Claims (5)
1. A direct-current power supply aging degree detection device is characterized by comprising an alternating-current millivoltmeter (1), a direct-current voltmeter (2), a working power supply (3), a direct-current ammeter (4), a sampling resistor (5), a voltage stabilizing diode (6), a selection switch (10), a first capacitor (7), a signal input end (20) and a load resistor (9), wherein the anode of the signal input end (20), the first capacitor (7), the sampling resistor (5), the direct-current ammeter (4) and the cathode of the signal input end (20) are sequentially connected in series, the voltage stabilizing diode (6), the sampling resistor (5) and the sampling end of the alternating-current millivoltmeter (1) are connected in parallel to form a parallel circuit, the load resistor (9) is connected in parallel to a series circuit formed by the first capacitor (7) and the sampling resistor (5) in series, the sampling end of the direct-current voltmeter (2) is connected in parallel to the signal input end (20) of a monitoring device, the working power supply (3) is connected in parallel with the working power supply ends of the alternating-current millivoltmeter (1), the direct-current voltmeter (2) and the direct-current ammeter (4).
2. The direct current power supply aging degree detection device according to claim 1, characterized by comprising a second capacitor (8), wherein a selection switch (10) is arranged between the first capacitor (7) and the positive electrode of the signal input end (20), a fixed contact of the selection switch (10) is connected with the positive electrode of the signal input end (20), two movable contacts of the selection switch (10) are respectively connected with one end of the first capacitor (7) and one end of the second capacitor (8), the other end of the second capacitor is connected with the other end of the first capacitor, and the first capacitor (7) and the second capacitor (8) have different capacities.
3. The direct current power supply degradation detection device according to claim 1, wherein the operating power supply (3) comprises a solar panel and a storage battery.
4. A dc power supply degradation detection device according to claim 2, wherein the first capacitor (7) and the second capacitor (8) are electrolytic capacitors.
5. The dc power supply degradation detection device according to claim 2, wherein the resistance of the load resistor (9) is freely adjustable within a range of 0 ohm to 200 ohm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921421606.7U CN211603493U (en) | 2019-08-29 | 2019-08-29 | DC power supply aging degree detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921421606.7U CN211603493U (en) | 2019-08-29 | 2019-08-29 | DC power supply aging degree detection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211603493U true CN211603493U (en) | 2020-09-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921421606.7U Active CN211603493U (en) | 2019-08-29 | 2019-08-29 | DC power supply aging degree detection device |
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| Country | Link |
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| CN (1) | CN211603493U (en) |
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2019
- 2019-08-29 CN CN201921421606.7U patent/CN211603493U/en active Active
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