发明名称 |
Drive circuit for light emitting diode |
摘要 |
A drive circuit for a light emitting diode, and applications thereof, are disclosed. In one example, the drive circuit includes an input voltage and a ground, and a current control block including a voltage supply connection, a ground connection, a first voltage sense connection, and a second voltage sense connection. The voltage supply connection electrically connects to the input voltage and the ground connection connected to the ground. The drive circuit includes a current sense resistor connected to the first voltage sense connection, a first current adjustment resistor connected between the current sense resistor and the second voltage sense connection, and a second current adjustment resistor connected between the second voltage sense connection and the input voltage. A light emitting diode can connect from a point between the current sense resistor and the first current adjustment resistor to the ground. |
申请公布号 |
US8786210(B2) |
申请公布日期 |
2014.07.22 |
申请号 |
US201012827688 |
申请日期 |
2010.06.30 |
申请人 |
Welch Allyn, Inc. |
发明人 |
Delucia Paul |
分类号 |
H05B37/02 |
主分类号 |
H05B37/02 |
代理机构 |
Merchant & Gould P.C. |
代理人 |
Merchant & Gould P.C. |
主权项 |
1. A drive circuit for a light emitting diode, the drive circuit comprising:
an input voltage and a ground; a current control block including a voltage supply connection, a ground connection, a first voltage sense connection, and a second voltage sense connection, the voltage supply connection electrically connected to the input voltage and the ground connection connected to the ground, the current control block configured to maintain a constant voltage across the first and second voltage sense connections; a current sense resistor connected to the first voltage sense connection; a first current adjustment resistor connected between the current sense resistor and the second voltage sense connection; and a second current adjustment resistor connected between the second voltage sense connection and the input voltage, thereby forming a voltage divider at the second voltage sense connection, such that adjustment of the input voltage proportionally changes a voltage across the light emitting diode at a constant current. |
地址 |
Skaneateles Falls NY US |