Safety capacitors, as a special type of capacitor, are often used in various electronic devices to ensure that they do not cause harm to people when they fail and to comply with safety certification standards. This type of capacitor has passed inspection and testing by national authoritative agencies, and is marked with the certification mark of each country on the body. But when a safety capacitor fails, what effect does it have on other components in the board? This is a question that concerns many people.
First, let's explore whether other components will be damaged when the safety capacitors in the circuit board fail. Generally speaking, the answer is no. The main function of a capacitor is to charge and discharge, similar to a battery that charges and discharges quickly. In the circuit, capacitors are mainly used for filtering, blocking DC traffic and storing electricity to boost voltage. When these functions fail, it may cause the circuit to stop working, reduce working efficiency, or work abnormally, but it usually does not cause damage to other components.
Secondly, damage to the safety capacitor may result in increased output ripple and voltage instability. Assuming that the safety capacitor you use is a qualified product, then even if it is damaged, it will not cause danger.
So, how do we judge the quality of safety capacitors? Usually, we can use a multimeter to test the quality of safety capacitors. First, select the appropriate ohmic block based on the capacitor capacity. For example, capacitors below 1UF can use the "20k" block, capacitors from 1UF to 100UF can use the "2k" block, and capacitors over 100UF can use the "200" block. Next, touch the red and black test leads of the multimeter to the positive and negative terminals of the capacitor respectively. If the multimeter displays a value that gradually increases from 0 and finally displays the overflow symbol 1, it indicates that the capacitor is normal; if it always displays 0, it may mean an internal short circuit in the capacitor; and if it always displays 1, it may be an internal short circuit in the capacitor. Through these steps, we can effectively judge the quality of safety capacitors and ensure the safe operation of the circuit.