a power source

Abstract

The invention discloses a power supply, which includes a constant current power supply; at least two current limiting protection branches are connected in parallel on the output circuit of the constant current power supply, and the current limiting protection branches include at least one load and a current limiting protector; each The design current limiting value of one of the current limiting protectors is greater than the design working current value of the current limiting protection branch where it is located; when the current of any one of the current limiting protection branches is equal to or less than the design of the circuit When the working current, the current-limiting protector in this circuit works in a saturated conduction state; when the current of any one of the current-limiting protection branches is greater than the design operating current of the circuit and reaches the When the design current limiting value of the current limiting protector is set, the current limiting protector in this circuit works in the current limiting state. Compared with the prior art, the short-circuit fault in the load can be effectively controlled, and when the load does not have a short-circuit fault, the current-limiting protector works in a state of low power consumption, which is beneficial to energy saving and environmental protection.

Description

technical field [0001] The invention relates to a power supply. Background technique [0002] At present, loads that need to be driven by a constant current usually work in series with multiple loads, and due to reliability and operating voltage, the number of loads in series cannot be too large, so in some high-power applications, it is generally used combination of series and parallel. [0003] figure 1 It is a kind of power supply in the prior art. As shown in the figure, it includes a constant current power supply, and multiple strings of load branches connected to the constant current power supply and connected in parallel with each other. The load is a load that needs to be driven by a constant current. Specifically, The load is LED, and the output current of the constant current power supply will be naturally distributed by these light strips during operation. However, when this series-parallel combination of LED lamps is working, if one of the loads has an LED sho...

AI Technical Summary

Problems solved by technology

However, when this series-parallel combination of LED lamps is working, if one of the loads has an LED short-circuit (short circuit is one of the most common failure forms of LEDs), the sum of the Vf of each LED in this branch is smaller than that of other circuits. , will lead to a substantial increase in the branch current, which often exceeds the maximum operating current of the LED, which can easily cause the LED to overheat and burn out

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