Switching power supplies generate more interference than linear power supplies. For electrical equipment sensitive to common-mode interference, grounding and shielding measures should be taken. According to EMC limits such as ICE1000,EN61000, and FCC, switching power supplies all adopt EMC electromagnetic compatibility measures. Therefore, switching power supplies generally should be equipped with EMC electromagnetic compatibility filters. For the HA series switching power supply of Lidehua Fu Technology, the FG terminal should be connected to the ground or to the user's casing to meet the above electromagnetic compatibility requirements.
Switching power supplies must be designed with protection functions such as overcurrent, overheating and short circuit to prevent damage to electrical equipment or the switching power supply.
The input voltage of a switching power supply can be 220V or 110V. Select the input voltage range reasonably according to the circuit design. Otherwise, it will cause damage to the switching power supply.
2. Pay attention to distinguishing the ground terminal and the neutral terminal of the output voltage terminal of the switching power supply. And ensure that the switching power supply is reliably grounded.
3. Metal casing of switching power supply: The power supply casing is generally connected to the ground and must be reliably grounded to ensure safety. Do not mistakenly connect the casing to the neutral wire.
4. Before the switch power supply is installed and powered on for a trial run, please recheck and calibrate the connections on each terminal to ensure that the input and output, AC and DC, single-phase and multi-phase, positive and negative poles, voltage and current values, etc. are all correct and without doubt. Only then can it be powered on for operation.
5. For high-power switching power supplies, there are usually two or more "+" output terminals and "-" output terminals. In fact, they all belong to the same output electrode. It's just that for the convenience of users' wiring, multiple terminals are connected in parallel inside.
6. To achieve adequate heat dissipation, general switching power supplies should be installed in locations with good air convection conditions or on the chassis shell to transfer heat to the outside through the shell.
7. Before leaving the factory, the switching power supply is tested with a resistive load. If it needs to be used with a capacitive or inductive load, it should be specified in advance in the purchase contract.
8. For dual-channel switching power supply output symmetrical loads, symmetrical output power supplies should be given priority.
9.For users with the FG of the switching power supply grounded, it is a normal phenomenon to feel a tingling sensation when touching the casing or the output. When the ground is floating, the FG has an AC output of about 110V to the ground, which is determined by the internal structure of the power supply.
10.Before leaving the factory, the switching power supply drill is 100% filled with negative energy for aging. Generally, the power supply utilization rate is controlled within 80% or even lower, which can greatly increase the service life of the power supply. Under normal circumstances, for every 10 ℃ increase in power supply temperature, the capacitor life is reduced by half.
11.The ripple and noise of a switching power supply are AC components superimposed on the DC output voltage and are generally represented by millivolt peaks.
12.For all switching power supplies, when the load undergoes a sudden change, there will be a certain response time. During this sudden change period, the output voltage of the power supply will have a brief overshoot process instantaneously, and then return to the normal output state. This is the dynamic response.
13.In the event of a malfunction of the switching power supply, please notify our factory as soon as possible. Our factory will be responsible for free repair or provide technical guidance, except for those who disassemble the power supply privately.