1. Technical Field
The present disclosure generally relates to electronic devices and, particularly, to an electronic device with convenient safety testing function.
2. Description of Related Art
Generally, before shipment, many electronic devices undergo safety test to ensure standards of quality have been met. Those electronic devices also have each been equipped with at least one lightning protection member, such as varistors, configured for leading a surge voltage generated by a lightning strike to the ground, thereby to protect the electronic device from being burned out. The safety testing method is providing a Hi-pot tester applying a high voltage power on the electronic device for testing voltage withstanding. However, when a high voltage power is applied to the electronic device, if the lightning protection member has not been disabled, the lightning protection member still works to lead the high voltage power to the ground, which can lead to failure of the safety test.
To avoid the problem mentioned above, in the past, shearing the pins of the lightning protection members to disable the lightning protection members was done before the safety test, and after the safety test was finished, rejoining the pins to the lightning protection members was needed. However, this kind of safety test process is time consuming.
Therefore, it is desirable to provide an electronic device which can overcome the above mentioned problems.
Many aspects of the present electronic device can be better understood with reference to the accompanying drawings. The components in the drawings are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the present electronic device. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the several views, and all the views are schematic.
Embodiments of the present electronic device will now be described in detail below and with reference to the drawings.
Referring to
The lightning protection circuit 10 includes a fire wire 11, a ground wire 12, an Alternating Current (AC) power unit 13, at least two lightning protection elements 14, and a circuit board 15. Both inputs of the fire wire 11 and the ground wire 12 are coupled to the AC power unit 13, and both outputs of the fire wire 11 and the ground wire 12 are coupled to the DC power unit 20. In the present embodiment, the lightning protection circuit 10 includes three lightning protection elements 14 respectively named as a first lightning protection element 14a, a second lightning protection element 14b, and a third lightning protection element 14c. The first lightning protection element 14a is connected between the fire wire 11 and the ground wire 12. The second lightning protection element 14b and the third lightning protection element 14c are serially connected between the fire wire 11 and the ground wire 12, a node A formed between the second lightning protection element 14b and the third lightning protection element 14c is connected to the circuit board 15. In this embodiment, the lightning protection elements 14 are varistors had a high resistance at low voltages and a low resistance at high voltages. The operating principle of the lightning protection elements 14 is that: when a surge voltage generated by lightning is applied to the first, second and third lightning protection elements 14a, 14b, 14c, the first, second and third lightning protection elements 14a, 14b, 14c have not been disabled.
In an alternative embodiment, the first lightning protection element 14a or the second lightning protection element 14b may be omitted.
The housing 50 includes a bottom board 51. The bottom board 51 defines a first threaded hole 510 penetrating through the bottom board 51.
The supporting device 30 includes a plurality of supporting columns 31 extending upward from the bottom board 51 of the housing 50, and a plurality of bolts 32. In this embodiment, the supporting column 31 and the bottom board 51 are integrated with each other and are made of insulation material. Each of the supporting columns 31 defines a second threaded hole 310. The circuit board 15 defines a plurality of third threaded holes 150 correspondingly to the second threaded hole 310. Each of the bolts 32 is screwed into a corresponding second threaded hole 310 and a corresponding threaded hole 150 to firmly fix the circuit board 15 on the supporting column 31.
The safety test switching device 40 includes a conduction block 41 formed on a surface of the circuit board 15 facing the bottom board 51, and a conductive plug 42 detachably plugged into the conduction block 41. In detail, the conduction block 41 defines a fourth threaded hole 410 aligned with the first threaded hole 510 of the bottom board 51. In this embodiment, the conductive plug 42 is a conductive metal bolt detachably engaged with the first threaded hole 510 and the fourth threaded hole 410.
In use, when the conductive plug 42 is disengaged from the fourth threaded hole 410, that is, when the conductive plug 42 is detached from the conductive block 41, the lightning protection circuit 10 and the ground are an open circuit. When a Hi-pot tester 60 supplies a high voltage power to the AC power unit 13, the AC power unit 13 outputs the high voltage power to the DC power unit 20 via the fire wire 11 and the ground wire 12 for testing voltage withstanding. After the safety testing is finished, the conductive plug 42 is screwed into the fourth threaded hole 410. During the time the electronic device 100 is working, because of a surge voltage caused by the lightning strike. The first lightning protection element 14a, the second lightning protection element 14b, and the third lightning protection element 14c have not been disabled thereby leading the power outputted by the AC power unit 13 to the ground via the circuit board 15 and the conductive plug 42. As a result, the surge voltage generated by the lightning is not applied to the DC power unit 20, thus the electronic device 100 is protected from being burned out by the surge voltage.
It will be understood that the above particular embodiments is shown and described by way of illustration only. The principles and the features of the present invention may be employed in various and numerous embodiments thereof without departing from the scope of the invention as claimed. The above described embodiments illustrate the scope of the invention but do not restrict the scope of the invention.
Number | Date | Country | Kind |
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99109741 | Mar 2010 | TW | national |