The LED lamp drive circuit
(1) technical field
The utility model relates to a kind of drive circuit of LED lamp.
(2) background technology
The power supply of general driving LED lamp load is provided with two joint dry cells in the prior art, but the electric weight in the two joint dry cells can not utilize fully, i.e. discharge reaches at 70% o'clock, and supply power voltage just can not reach the requirement of LED lamp starting resistor, the LED lamp can not start, and battery is no longer power supply also.
(3) summary of the invention
In order to overcome above-mentioned deficiency of the prior art, the utility model provides a kind of LED lamp drive circuit that a joint dry cell is set and can makes full use of the electric weight in the dry cell.
The technical scheme in the invention for solving the technical problem is:
A kind of LED lamp drive circuit comprises battery supply, and the LED lamp string that connects battery supply and be cascaded, described battery supply only are provided with a joint dry cell, and described battery supply connects LED lamp string by a booster circuit.
As preferably, booster circuit comprises the IC that boosts.
As improvement, be connected in series with a switch between battery supply and the booster circuit.
One joint dry cell only is set in battery supply, and boost in voltage is arrived the needed voltage of LED lamp string by booster circuit.Dry cell after boosting can make full use of the electric weight in the dry cell.Booster circuit realizes by the IC that boosts, the break-make that switch can control circuit.
The beneficial effects of the utility model are: the utility model only is provided with a joint dry cell, and connects LED lamp string by the booster circuit back of boosting, and then can make full use of the electric weight in the dry cell, and only need a joint dry cell, has saved cost.
(4) description of drawings
Fig. 1 is an electrical block diagram of the present utility model.
(5) embodiment
Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.
As shown in Figure 1, a kind of LED lamp drive circuit, comprise battery supply 1, the LED lamp string that connects battery supply and be cascaded, the output of described battery supply connects a booster circuit 3 by a switch 2, booster circuit boosts by the IC that boosts, and the output of booster circuit connects the LED lamp string 4 of being connected in series, and 1 of battery supply is provided with a joint dry cell.The voltage of one joint dry cell has only 1.5V, offers LED lamp string after boosting through booster circuit.
One joint dry cell only is set in battery supply, and boost in voltage is arrived the needed voltage of LED lamp string by booster circuit.Dry cell after boosting can make full use of the electric weight in the dry cell.