Electronic devices with protective circuits
An electronic device and protection circuit technology, which is applied in the direction of emergency protection circuit device, circuit device, automatic disconnection emergency protection device, etc., can solve the problems of the optical drive system 10 being unable to be used normally, damaged, burned out, etc.
Inactive Publication Date: 2011-12-07
PHILIPS & LITE ON DIGITAL SOLUTIONS
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Problems solved by technology
However, once the second driving voltage is input to the first voltage circuit 12 of the optical drive system 10, since the second driving voltage is greater than the first driving voltage, it often causes the first voltage circuit 12 to be unable to withstand the excessive second driving voltage. Damaged or even burned, so that the optical drive system 10 can no longer be used normally
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[0034] According to the first embodiment of the present invention, the detection unit 226 is used to detect the voltage level input on the first power supply terminal (V1), and determine whether to enable the control unit 222 according to the detected voltage level. . When the voltage level input on the first power supply terminal (V1) is greater than the preset voltage, the detection circuit 226 will enable (enable) the control unit 222, and at this time, the enabling of the control unit 222 will cause the control switch unit 224 to form a An open circuit prevents the voltage level input from the first power terminal ( V1 ) from being input to the first voltage circuit 12 . Conversely, when the voltage level input on the first power terminal (V1) is lower than the preset voltage, the detection circuit 226 will disable the control unit 222, and at this time, the disabling of the control unit 222 will make the switch unit 224 A closed circuit state is formed, so that the volta...
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The invention discloses an electronic device with a protective circuit. The electronic device disclosed by the invention comprises a first power supply end for receiving first driving voltage and second driving voltage, a second power supply end for receiving the second driving voltage or the first driving voltage, the protective circuit connected with the first power supply end, a first voltage circuit connected with the protective circuit and a second voltage circuit connected with the second power supply end, wherein the second driving voltage is larger than the first driving voltage; the first driving voltage is used for driving the first voltage circuit; the second driving voltage is used for driving the second voltage circuit; if the first driving voltage is input by the first power supply end, the protective circuit outputs the first driving voltage to the first voltage circuit; and if the second driving voltage is input by the first power supply end, the protective circuit isolates the second driving voltage to be output to the first voltage circuit.
Description
technical field [0001] The invention relates to an electronic device, in particular to an electronic device with a protection circuit for preventing wrong connection of multiple driving voltages of the electronic device. Background technique [0002] Generally speaking, most electronic devices only need a single driving voltage to operate normally. However, some electronic devices need to receive multiple different driving voltages simultaneously to operate normally. For example, a half-high optical drive or a hard disk drive. The following descriptions all take the optical drive system as an example. The optical drive is driven by two different power supply voltages of 5V and 12V. Please refer to figure 1 , which shows a schematic diagram of an existing optical drive system. The optical drive system 10 includes a first voltage circuit 12 and a second voltage circuit 14, wherein the first voltage circuit 12 is driven by a first power input from a power connector (not show...
Claims
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IPC IPC(8): H02H11/00
CPCH02H3/202
Inventor 李英明
Owner PHILIPS & LITE ON DIGITAL SOLUTIONS