Multi-path flow equalizing capacitor durability tester

Abstract

The invention discloses a multi-path flow equalizing capacitor durability tester, belongs to electronic test equipment, and particularly relates to a capacitor durability tester. The tester comprises a plurality of transformers; the primary windings of the transformers are connected in series; a constant alternating-current power supply is connected at the head and the tail of the serially-connected primary windings; two ends of the secondary main winding of each transformer are connected at two ends of the normally-open contact of a contactor respectively; the central points of the secondarymain windings of the transformers are all connected with the anode of the same direct-current power supply; the cathode of the direct-current power supply is connected in parallel with resistors respectively; the resistors and the transformers have the same number, each resistor corresponds to one transformer, and the other ends of the resistors are separated from one another; and the secondary windings of the transformers are provided with a voltage sampling winding respectively. The tester can continuously work; if a certain tested capacitor fails, continuous test of other capacitors cannotbe affected; and alternating-current ripple current applied to each tested capacitor has small error.

Description

technical field [0001] The invention belongs to electronic test equipment, in particular to a capacitor durability tester. Background technique [0002] my country is the largest producer of electrolytic capacitors in the world. The main function of the electrolytic capacitor in the circuit is filtering, and its physical meaning is to repeatedly charge and discharge the electrolytic capacitor. The more the charge and discharge times, the greater the change in the physical characteristics of the electrolytic capacitor, for example, its capacity will gradually decrease, and the heat will be generated inside the electrolytic capacitor due to continuous charge and discharge, and the accumulation of this heat will make the capacitor inside Raising the temperature too high eventually vaporizes the electrolyte inside the capacitor and can explode, so this creates a problem with life testing electrolytic capacitors. Since the electrolytic capacitor is a polarized component, when w...

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Problems solved by technology

[0005] And because the capacitors to be tested are connected in parallel in a group of ten capacitors, because there is an error in the capacity of each capacitor, the national standard stipulates that this error can be within ± 20%, that is, their AC impedance can exist ± 20% error, so the AC current flowing through each capacitor also has a ±20% error

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