EN45545-2 is UIC and Europe's Fire protection on railway vehicles. This standard according to the Requirement for fire behaviour of materials and components, smoke impermeability and toxicity from gas, to formulate the standard for the material selection.

Why does POWERGOOD use ceramic capacitors (MLCC) instead of tantalum capacitors or electrolytic capacitors ?
 

Compared with tantalum capacitors and electrolytic capacitors, ceramic capacitors are small in size, long in life and have a wider working temperature.

Moreover, electrolytic capacitors are prone to failure after volatilization. In contrast, ceramic capacitors have higher stability, which is why we use ceramic capacitors.

Why does POWERGOOD use six-sided metal design？

Six-sided metal case  packaging can provide 100% RFI shielding, no radiation interference, but also can make the product has better heat radiation effect.

What is PFC？

Power factor refers to the relationship between effective power and total power consumption, that is, the ratio of effective power divided by total power consumption. Basically, the power factor can measure the degree of power standby effective utilization. The higher the power factor value is, the higher the power utilization rate will be. POWERGOOD's upcoming 3-phase PFC has an efficiency of 97% and provides 3K-5K watts without cooling tools, and can be used in harsh environments.

What is the difference between Class A and Class B？

EMI measures the radiation and conduction of a device when it is in normal operation. Generally, it is divided into Class A and Class B. Class A is the industrial grade and Class B is the civil grade. Civilian one is stricter than industrial one because industrial one allows a wider range of radiation.

What are the differences between Positive logic and Negative logic？

Negative logic: after the module is powered on, it will not operate, the switch needs to be turned on to operate. Ex. The TV will not start up automatically when it is plugged in, the power button will not start up until it is pressed.
Positive logic: when the module is powered on, it will operate automatically. Ex. The clock will work as soon as it is plugged in.

What protection modes do POWERGOOD products have？

POWERGOOD products include OCP, OVP, OVLO, UVLO, OTP.
Over Current Protection (OCP): A protective mechanism that shuts off the power supply when the output current exceeds a preset value.
Over Voltage Protection (OVP): A protective mechanism that shuts off the power supply when the output voltage exceeds a preset value.
Over-Voltage Lockout (OVLO): When the power supply voltage in an electronic device is higher than a certain standard value, the power supply circuit will be cut off to protect the circuit.
Under-Voltage Lockout (UVLO): When the input current is lower than the preset value, no output current will be generated.
Over Temperature Protection (OTP): When the internal temperature of the power supply is too high, the OTP will be started to shut off the power supply immediately, so as not to burn out due to the internal parts overheating.

What are the differences of operating case temperature between POWERGOOD modules and other brands？

The operating temperature of the POWERGOOD converter is widely available from other brands. The bricks can operate at -45°C~105°C, while the encapsulated can operate at -45°C~115°C. Our modules can work in harsh environments and can be used in railways, aviation and... And so on.
 

How many kinds of Short Circuit Protection(SCP) do POWERGOOD modules have ?

POWERGOOD products come in two protection modes:
1. Current Limit: When the output current exceeds a certain value, the voltage will be limited and the module will continue to operate. However, the module will continue to burning hot during the operation.
2. Hiccup Mode: When the output wattage exceeds a certain value, the module will enter protection and will no longer work, it will need to be turned on again to work. In this case, the module will not be hot.

How do POWERGOOD's brick modules dissipate heat ?

POWERGOOD's brick modules have a six-sided metal design that allows customers to affix them to the machine table or affix heat sinks to the product to dissipate heat. If the customer is unwilling to affix the module to the machine or put a heat sink on the product, they can only be used at a derating rate to prevent the module from overheating.