Led power supply is a kind of power supply. It is a device that provides power to electronic equipment, also known as power supply. It provides lighting power and power required by all components in the computer.
Led power supply protection mode: 1. Half-bridge and full-bridge of straight-through circuit are common topologies of switching power supply, and 'straight-through' poses a great threat to them, through is the phenomenon that two transistors on the same bridge arm conduct at the same time.
During the commutation period, the switching power supply is vulnerable to interference and causes direct current. Excessive direct current will damage the power electronic devices used for inverter.
Once there is a straight-through phenomenon, the drive must be detected as soon as possible and turned off immediately to prevent the PN junction of the switching device from accumulating excessive heat and burning out.
2. Over-current circuit when unexpected situations such as load short circuit, overload or control circuit failure occur, the current flowing through the switch tube will be too large, which will increase the power consumption and heat of the tube. If there is no over-current protection device, the high-power switch tube may be damaged;
Failure of the regulating circuit may also cause LED overcurrent damage.
Over-current protection is generally detected and compared by sampling resistor or Hall sensor, so as to realize protection, but they all have the disadvantages of large volume and high cost.
3. Overload circuit steady current switching power supply is easy to cause current overshoot during startup and shutdown, and loads such as LED are not allowed to cause current overshoot at ms level, the impact of instantaneous large current may damage LED devices, so current overshoot must be strictly prevented.
4. Overvoltage circuit steady-current power supply if the load is disconnected, the voltage at both ends of the current detection resistor will drop to zero. Once the given value is not zero, the regulator will make the output voltage soar to * large value, this is very dangerous when the load connection contact is not good.
For loads such as LED and semiconductor refrigeration, when overvoltage occurs, the primary task is to protect the load, followed by protecting the switch power tube.
In order to solve the above problems, there are two protection methods used at the same time. One is to place bidirectional TVS to realize the protection of instantaneous impulse voltage.
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