Patent ID: 7846066
Filing Date: 2010-12-07
Classification: A63B,H05B,Y02B

Abstract:
1. A light-emitting control circuit, for receiving a voltage source, the light-emitting control circuit comprising: a first transistor, having a first node, a second node, and a control node; a second transistor, having a first node, a second node, and a control node, wherein the first node of the second transistor receives the voltage source, and the second node of the second transistor is electrically connected to the control node of the first transistor; a first resistor, having a first node and a second node, wherein the first node of the first resistor receives the voltage source, and the second node of the first resistor is electrically connected to the first node of the first transistor; a second resistor, having a first node and a second node, wherein the first node of the second resistor receives the voltage source, and the second node of the second resistor is electrically connected to the control node of the second transistor; a third resistor, having a first node and a second node, wherein the first node of the third resistor is electrically connected to the second node of the second transistor and the control node of the first transistor, and the second node of the third resistor is grounded; a first light-emitting diode (LED), having a first anode and a first cathode, wherein the first anode is electrically connected to the second node of the first transistor, and the first cathode is grounded; and a second LED, having a second anode and a second cathode, wherein the second anode is electrically connected to the second node of the second transistor and the control node of the second transistor, the second cathode is grounded, and a forward bias of the second LED is greater than a forward bias of the first LED; wherein when a voltage value of the voltage source is greater than a first threshold value, the first LED is turned on, when the voltage value is greater than a second threshold value, the first LED and the second LED are turned on at the same time, and when the voltage value is greater than a third threshold value, the first LED is not turned on and the voltage value is increased instantly.