The application of the second copy power source in the lighting system is one of the important factors to lower the cost and improve the flexibility. The inherent limited power sources such as the transformer, power supply and batteries can contain the protection components, as long as they don’t depend on these components to limit the output of the second type power source.
Non-inherent limited power source has one discrete protection component. According to its definition, when the current and power output arrives at the index value, it will automatically interrupt the input. All kinds of circuit protection components are conductive to provide the safe operation of LED lighting application of the second type power source. Figure 1 indicates the operating principle of the collaborative protection scheme. It has adopted a MOV on AC input a PolySwitch component on the branch of output circuit, which can help the manufacturers to meet the requirement of the section 35.1 of UL 1310 aiming at the over-load test of the switch and control device.
Figure 1 the collaborative protection scheme of the second type power source
Reset of PPTC components can prevent the damage caused by over current and over temperature fault. MOV over-voltage protection components are conductive to the manufacturers to meet the requirement of all kinds of security mechanism, can provide large current transport and have the energy absorption capability, and can rapidly respond to the over-voltage transient. Compared to most ESD protection components, PESD component capacity is very low, about 0.25, and has the most common form factor in the electronics industry.
PolyZen components not only has provided the simplification of the traditional clamping diode, but has also avoided the large demands of heat sink. This kind of single component scheme can provide the protection for the damage caused by the misuse of the power source, and has the protection ability of transient suppression and reverse biased voltage to prevent the damage caused by over current. The application of these components in the collaborative protection scheme can help the designer decrease the component number, provide the safe and reliable products to meet the requirement of the regulatory body, also can reduce the warranty and maintenance costs.
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