一.Electromagnetic compatibility and basic protection requirements

1. The interference generated by switching power supplies is usually higher than that of linear power supplies. For electrical equipment sensitive to common-mode interference, grounding and shielding measures are required. According to EMC standards such as IEC 1000, EN 61000, and FCC, switching power supplies must implement EMC protection measures, and therefore are generally equipped with EMC filters.

2.During the design phase, a switch-mode power supply must integrate protection functions such as overcurrent, overheat, and short circuit to prevent damage to the electrical equipment or the power supply itself under abnormal conditions.

二. Operating Procedures

1. The switching power supply input voltage supports 220V or 110V. The input voltage level should be reasonably selected according to the circuit design requirements, otherwise it may cause damage to the switching power supply.

2. It is necessary to clearly distinguish between the ground terminal and the neutral terminal of the switch power supply output voltage, and ensure that the grounding of the switch power supply is reliable.

3. The metal casing of a switch-mode power supply usually needs to be connected to the ground. It is essential to ensure reliable grounding for safety, and it is strictly forbidden to mistakenly connect the casing to the neutral line.

4.Before powering on and performing a trial run after the switch power supply is installed, it is necessary to recheck and verify the connection status of all wiring terminals. Only after confirming that the input and output, AC and DC, single-phase and multi-phase, positive and negative poles, voltage values, and current values are all correct can the power be applied for operation.

5. High-power switching power supplies generally have two or more "+" output terminals and "-" output terminals. These terminals actually belong to the same output electrode and are only intended to facilitate user wiring, as they are internally connected in parallel.

6. To achieve adequate heat dissipation, the switch-mode power supply should be installed in a location with good air convection, or mounted on the chassis so that the chassis conducts heat to the outside of the device.

7. If the FG terminal of the switching power supply is designed to be grounded, it is normal for users to feel a slight tingling sensation when touching the casing or output terminals. In a floating ground state, an AC voltage of approximately 110V may appear between the FG terminal and the earth, which is determined by the internal structure of the power supply.

8. The switch-mode power supply has undergone 100% rated load aging test before leaving the factory. It is recommended to keep the power usage below 90% during use to significantly extend the service life of the power supply.

9. The ripple and noise of a switching power supply are the AC components superimposed on the DC output voltage, and their values are generally expressed in millivolt peak (mVp).

10. All switching power supplies have a certain response time when the load changes abruptly; during the load transient, the power supply output voltage will momentarily overshoot and then return to the normal output state. This process is called dynamic response.

11.Once the switch power supply fails, please immediately notify our company. We will provide users with free repair services or technical guidance.