Certification

Q1

Why does the product specification indicate Input Voltage 88-264Vac and the machine specification sticker indicates 100-240V?

Ans

The user sees the marked input voltage range on the machine. In fact, during safety certification, the so-called tightening ± 10% test (IEC60950 tightening + 6% -10%), so the voltage range defined in the power supply specification There is no problem in use; and the marking on the machine is to meet safety regulations and ensure that the user can correctly input power.

Q2

Is your CE-marked product installed in our system and sure to meet EMC requirements?

Ans

Not necessarily, the location of the general power supply in the system, the arrangement of the line group, and the design of the system grounding, etc., will cause some impact. The same power supply often has different results in different usage environments or applications. Our test results are based on the settings in the EMC test report.

Q3

What is the difference between the information (EN60950-1) and medical (EN60601-1) safety standards?

Ans

According to safety standards, the maximum leakage current of EN60950-1 ClassI cannot exceed 3.5mA; the maximum leakage current of EN60601-1 cannot exceed 0.3mA. There are many different safety distances and the number of fuses when measuring. The related differences are listed in the following table:

Q4

What is CLASS 2, CLASS II and LPS? What is the difference between CLASS I and CLASS II?

Ans

CLASS I: This type of equipment is protected against electric shock through the use of basic insulation, and also provides a protective ground impedance to the building. When the basic insulation fails, this ground impedance will withstand dangerous voltages to ground. In other words, the CLASS I switching power supply will provide a pair of ground connection terminals.
CLASS II: This type of equipment not only relies on basic insulation to prevent electric shock protection, but also must provide additional safety measures for double insulation or reinforced insulation, and it does not rely on ground protection. In other words, the CLASS II switching power supply does not provide a pair of grounding terminals.
LPS: Its main purpose is that when the electronic circuit is powered by LPS, the current and energy of this circuit can be lower than the specified standard value according to the requirements of IEC60950-1 Table 2B standard, and the danger of fire is great. Reduced. Therefore, the pitch on the circuit and the fire rating of the parts are greatly reduced. Therefore, the material of the casing of these circuits can be HB-grade plastic material to achieve the purpose of cost savings. It should be from ITE products (IEC / EN / UL60950-1).

Class 2: The main purpose is that when the electronic circuit is powered by Class 2, the current and energy of this circuit can be lower than the specified standard value according to the requirements of UL1310 Table 30.1 standard, and the danger of fire is great. Reduced. Therefore, the pitch on the circuit and the fire rating of the parts are greatly reduced. Therefore, the material of the casing of these circuits can be HB-grade plastic material to achieve the purpose of cost savings. It shall be from UL class 2 Power units (UL1310).



Q5

What is SELV for information products?

Ans

SELV refers to the secondary circuit, which is designed and protected under normal conditions, between any two accessible locations, or for Class I equipment, between any accessible location and the protective ground terminal of the equipment The voltage should not exceed 42.4Vpeak or 60Vdc; under a single error condition, it can allow more than 42.4V peak or 60Vdc, but the time should not exceed 0.2sec, and it should not exceed 71V peak or 120Vdc. According to the requirements of the following regulations, as long as Mingwei's switching power supply that complies with this regulation can comply with SELV. IEC 60950-1 (ITE SPS): The voltage of the output circuit is lower than 60VDC under normal conditions. IEC 61347-2-13 (LED SPS): The voltage of the output circuit is lower than 120VDC under normal conditions.

Q6

What is LPS and how can LPS-compliant products help system applications?

Ans

LPS (Limited Power Source) requirements come from IEC 60950 (ITE SPS), which means that under normal and abnormal conditions, the output of the product must be less than 60V / 8A / 100W. When the power source of the system supplier comes from the SPS that complies with LPS, the system enclosure does not need to provide a fireproof enclosure.

Q7

What is LVLE and how can LVLE-compliant products help system applications?

Ans

The definition of UL8750 is as follows:
a. The output voltage is below 30Vdc (inclusive): the maximum output current is 8A
b. Output voltage 30Vdc ~ 60Vdc: output current max. 150 / Vo (max)
When the system supplier's power source comes from LVLE-compliant SPS, the system enclosure does not need to provide a fireproof enclosure.

Q8

What is MOOP and MOPP?

Ans

a. MOOP (Mean Of Operator Protection): Provide adequate protection for operators
b. MOPP (Mean Of Patient Protection): Provide adequate protection for patients
c. MOP (Mean Of Protection) layer of protection 2MPP products are announced, which means that the input and output of the product provide 2 adequate protection for patients, minimize the danger of the product, and can be applied to patients.

Q9

The LED driver also has SELV. Is this the same as IEC60950 (ITE)?

Ans

The corresponding SELV requirements for LED drivers come from IEC 61347 (LED). This is not the same as IEC60950 (ITE). The SELV mentioned by the LED driver means that the product itself uses an isolation transformer for double isolation, and the output voltage will be less than 120V DC. LED driver with SELV output has better isolation and safer voltage output, which will help the isolation requirements of the lighting equipment connected at the back end.

Q10

What is Type HL?

Ans

Type HL comes from UL8750 and conforms to Type HL, which means that this LED driver can be directly applied to C1, D2 explosion-proof lamps. This application will greatly simplify the review process for manufacturers applying for explosion-proof lamps.