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What is a good capacitor--Zhizhong Electronics specializes in producing high-quality capacitors

1. The larger the capacitance, the better?

Many people tend to use large-capacity capacitors in the replacement of capacitors. We know that although the larger the capacitance, the current compensation capability provided by the IC

The stronger the force. Not to mention the increase in capacitance brought about by the increase in volume, which increases the cost and also affects air flow and heat dissipation. The key is electricity

There is parasitic inductance on the capacitor, and the capacitor discharge circuit will resonate at a certain frequency. At the resonance point, the impedance of the capacitor is small. So the discharge circuit

The impedance is the smallest, and the effect of supplementing energy is the best. But when the frequency exceeds the resonance point, the impedance of the discharge circuit begins to increase, and the capacitor provides electricity.

Flow capacity began to decline. The larger the capacitance of the capacitor, the lower the resonance frequency, and the smaller the frequency range in which the capacitor can effectively compensate for the current. From the guarantee

From the point of view of the ability of capacitors to provide high-frequency current, the larger the capacitor, the better it is wrong. There is a reference in general circuit design.

worth it.

2. For capacitors of the same capacity, the more small capacitors in parallel, the better?

Voltage resistance value, temperature resistance value, capacitance value, ESR (equivalent resistance), etc. are several important parameters of a capacitor. Naturally, the lower the ESR, the better. ESR and

Capacitor capacity, frequency, voltage, temperature, etc. are all related. When the voltage is fixed, the larger the capacity, the lower the ESR. Used in board design

Multiple small capacitors connected in parallel are mostly due to the limitation of PCB space, so some people think that the more small resistors in parallel, the lower the ESR, the better the effect.

. Theoretically, this is the case, but considering the impedance of the solder joints of the capacitor pins, using multiple small capacitors in parallel may not necessarily be outstanding.

3. The lower the ESR, the better the effect?

Combined with our improved power supply circuit above, for the input capacitor, the capacity of the input capacitor should be larger. Relative capacity

Requirements, the requirements for ESR can be appropriately reduced. Because the input capacitance is mainly the withstand voltage, followed by absorbing the switching pulse of the MOSFET. For lose

In terms of capacitors, the withstand voltage requirements and capacity can be appropriately reduced a bit. The ESR requirement is a bit higher, because what must be guaranteed here is sufficient

Current throughput. But it should be noted here that ESR is not as low as possible. Low ESR capacitors will cause the switching circuit to oscillate. And the damping circuit is complicated

At the same time it will lead to an increase in costs. In the board design, there is generally a reference value here, which is used as a component selection parameter to avoid the impact of the anti-vibration circuit.

Lead to an increase in costs.

4. Good capacitors represent high quality?

The "capacitance-only theory" once flourished, and some manufacturers and media deliberately made this thing a selling point. In the board design,

The level of circuit design is the key. Just as some manufacturers can use two-phase power supply to make products that are more stable than some manufacturers use four-phase power supply, one

The use of high-priced capacitors does not necessarily make a good product. To measure a product, it must be considered from all angles and from all angles.

The role of content is exaggerated intentionally or unintentionally.

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