Patent Application
20140285353
1. Technical Field
The present disclosure relates to an electronic device with an indicating circuit.
2. Description of Related Art
Electronic devices include a power supply, a load, and a fuse connected between the power supply and the load. When a current is in an over current state, the fuse is melted disabling the electronic device and preventing the load from being destroyed. However, there are different reasons that cause the electronic device to become disabled, a multimeter is needed for manually determining whether the fuse is melted, therefore the operations are complicated.
Therefore, there is room for improvement in the art.
Many aspects of the embodiments can be better understood with reference to the following drawings. The components in the drawings are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the embodiments. Moreover, in the drawings, like reference numerals designate corresponding parts throughout two views.
The disclosure is illustrated by way of example and not by way of limitation in the figures of the accompanying drawings in which like references indicate similar elements. It should be noted that references to “an” or “one” embodiment in this disclosure are not necessarily to the same embodiment, and such references mean at “least one.”
The electronic device 100 includes a protection module 20, an indicating circuit 30, and a load 50.
The protection module 20 is connected between the power supply 200 and the load 50. The protection module 20 establishes a connection between the power supply 200 and the load 50 when the current passing through the protection module 20 is less than a predetermined value, further generates a first control signal to the indicating circuit 30. The protection module 20 cuts off the connection between the power supply 200 and the load 50 when the current passing through the protection module 20 is more than the predetermined value, and further generates a second control signal to the indicating circuit 30.
The indicating circuit 30 is connected to the power supply 200 and the protection module 20. The indicating circuit 30 outputs first indicating information in response to the first control signal, and outputs second indicating information in response to the second control signal. The indicating circuit 30 includes a first indicating module 31 and a second indicating module 32.
The first indicating module 31 is connected between the protection module 20 and the second indicating module 32. The first indicating module 31 outputs first indicating information and controls the second indicating module 32 to be disabled for outputting second indicating information when the first control signal from the protection module 20 is received, and is disabled for outputting the first indicating information when the second control signal from the protection module 20 is received. In the embodiment, the first indicating information is a green light, and the second indicating information is a red light.
The second indicating module 30 is connected to the power supply 200 and the first indicating module 31. The second indicating module 32 outputs the second indicating information when the first indicating module 31 is disabled.
The protection unit 20 includes a fuse F1. Opposite terminals of the fuse F1 are connected to the power source V1 and the load 50.
The first indicating module 31 includes a first light-emitting diode D1. An anode of the first light-emitting diode D1 is connected between the fuse F1 and the load 50. A cathode of the first light-emitting diode D1 is grounded through the resistor R1.
The second indicating module 32 includes a second light-emitting diode D2, a diode D3, and a resistor R1. An anode of the second light-emitting diode D1 is connected to the power source V1 through the diode D3. A cathode of the second light-emitting diode D2 is connected between the cathode of the first light-emitting diode D1 and the resistor R1. An anode of the diode D3 is connected to the power source V1. A cathode of the diode D3 is connected to the anode of the second light-emitting diode D2.
The principle of the electronic device 100 is described, when the current passing through the fuse F1 is less than the predetermined value, the power terminal V1 outputs the working voltage to the load 50. The voltage difference between the anode and the cathode of the first light-emitting diode D1 is more than 0.7 volt (V), the first light-emitting diode D1 turns on and emits light in a first color. Because of the diode D3 and the resistor R1, the voltage difference between the anode and the cathode of the second light-emitting diode D2 is less than 0.7V, the second light-emitting diode D2 turns off and does not emit light in a second color.
When the current passing through the fuse F1 is more than the predetermined value, the fuse F1 is blown and cuts off the connection between the power terminal V1 and the load 50. The voltage difference between the anode and the cathode of the first light-emitting diode D1 is less than 0.7V, the first light-emitting diode D1 turns off and stops emitting light in the first color. The voltage difference between the anode and the cathode of the second light-emitting diode D2 is more than 0.7V, the second light-emitting diode D2 turns on and emits light in the second color. As a result, the different states of the fuse F1 are indicated by the different indicating information of the indicating circuit 20.
It is to be understood, however, that even though information and advantages of the present embodiments have been set forth in the foregoing description, together with details of the structures and functions of the present embodiments, the disclosure is illustrative only; and changes may be made in detail, especially in the matters of shape, size, and arrangement of parts within the principles of the present embodiments to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2013100938065 | Mar 2013 | CN | national |
