Drive circuit and lamp fixture

Abstract

The embodiments of the invention relate to the illumination field, and provide a drive circuit and a lamp fixture. A low-power stabilized power supply is arranged so that when a lamp fixture is at a dormancy state, the standby power consumption of the drive circuit is quite low, unnecessary energy consumption is saved, and the life of the lamp fixture is prolonged. Besides, a control unit, a current sampling circuit and a DC / DC conversion circuit are arranged so that the current size of a light source can be determined through the control unit according to light source currents obtained by the current sampling circuit, and the DC / DC conversion circuit can be controlled to output stable currents to the light source, thus the stability of a lamp fixture circuit is improved, the drive circuit of the lamp fixture satisfies the reference indicators of high efficiency and low power, a stable, low-power and long-standby time drive circuit is provided for a portable illumination lamp fixture, and the overall electrical efficiency of the drive circuit and the lamp fixture is ensured.

Description

technical field [0001] The present application relates to the lighting field, in particular to a driving circuit and a lamp. Background technique [0002] With the development of lighting technology, LEDs are more and more widely used in the field of general lighting. LED is used as the light source of lighting appliances, and the efficiency of driving power supply and standby power consumption are important reference indicators for testing LED appliances. [0003] At present, in the drive power supply with high voltage input, a linear voltage regulator or a DC / DC voltage regulator circuit is mostly used to provide the constant current required by the LED load. However, when the lighting fixtures are at rest, the lamps using linear voltage regulator or DC / DC voltage regulator circuit will generate large power consumption, quickly consume the power of the battery, reduce the life of the lamps, and cause a great impact on the maintenance cost of the lamps. It is a great burd...

AI Technical Summary

Problems solved by technology

However, when the lighting fixtures are at rest, the lamps using linear voltage regulator or DC / DC voltage regulator circuit will generate large power consumption, quickly consume the power of the battery, reduce the life of the lamps, and cause a great impact on the maintenance cost of the lamps. It is a great burden, especially for portable lighting fixtures. If the battery power is consumed too quickly, it is easy to shorten the use time of the lamps.

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