Pressure and response of solar LED lighting lamps and lanterns

Leakage current setting of the leakage current here specifically to withstand voltage test of leakage current, for us in the test set of alarm thresholds. The body for the reaction of the current situation is: current perception: 1. 1 ma, female 0. 7mA; Get rid of the current: male 9 ma, female 6 ma

( Rate is 99. 5%) ; Deadly current ( Ventricular fibrillation current) ：50mA( Current lasting more than a heartbeat cycle) ，500mA( Current duration at 0. Within 1 second) 。 Current through the human body as more than 10 ma, there is the risk of electric shock. So in general, the leakage current of the type testing standard is defined as 5 ma. GB

7000。 1, the type test section is not clearly stipulated stress test the leakage current, in appendix factory pilot testing, specified the size of the value. Withstand voltage test and breakdown test standard will specify when testing the specific voltage value. After pressure test can only indicate the insulation of the product structure to withstand the test voltage, could not indicate the insulation structure of the product can withstand the high voltage. If the application research of the insulating material and electrical equipment design, dielectric strength, must be tested to breakdown test. Breakdown test is to test the dielectric is breakdown voltage. When the electric field intensity exceeds a certain limit, through the medium of the voltage of electric current and applied to medium relation does not conform to the ohm's law, but the sudden increase. As shown in figure 1, insulation insulation performance was damaged and lost. For electric products, if its insulation breakdown, it loses the use function. Some customer inspection request according to the type of test standards, do a minute test, the product 'bring nothing to harm' : first, may reduce the percent of pass of the products; Second, although through the test, can damage part of the insulation structure, reduce product safety; Third, some may damage the components, reduce the quality of the product, shorten service life. Compression tests pass, not on behalf of the lamps and lanterns is in good condition. In many cases, the LED lamp bead can through pressure type test, but will cause the delay of lamps and lanterns, but will be greatly reduced because of the delay destroy the life of the lamps and lanterns. Test methods of typical pressure test method: 1, check to determine whether the withstand voltage tester is the main power switch is in 'off' position; 2, unless special instrument design, all is not charged metal parts must be reliable grounding; 3, all of the equipment under test power lines or at the input terminal connected; 4, all of the equipment under test on the power switch, relay, etc. ; 5, adjusted the test voltage withstand voltage tester is zero; 6, the hipot tester of high voltage output line ( Usually red) Power input end is connected to the device under test; 7, the hipot tester circuit grounding line ( Usually a black) To connect to the device under test can't hit a charged metal parts; 8, the withstand voltage tester is the main power switch is closed, the slow rise of the instrument secondary voltage to the required value, average pressure rise rate no more than 500

the speed of the V/SEC; 9, to maintain the test voltage within the specified time; 10 and the test voltage slow down; 11, disconnect the withstand voltage tester is the main power switch. Disconnect withstand voltage tester is high voltage output line, and then disconnect hipot tester circuit grounding line. Said device under test is not pass the test in the following circumstances: 1, when a test voltage can't rise to the specified voltage or voltage drop instead; 2, the withstand voltage tester is a warning signal. It is important to note that because of the pressure tests on the personal danger of high voltage, must be particularly careful when testing. Special attention should be paid to the items: 1, must be prescribed only trained and authorized personnel can enter the test area operation instrument; 2, must be placed around the test area of fixed and obvious warning signs, to prevent others come into the danger zone; 3,

when tested, including operators, all personnel must be far away from the test instrument and equipment under test; 4,

test equipment starts up, don't touch the output line. Common way to improve the compression capacity, adding isolation transformer, effectively reduce the secondary circuit through transformer under the pressure of value; Increase the dielectric strength, such as glue, add insulation gasket; Improve PCB compression capacity: a, choose high dielectric layer compression capacity of circuit board; B, increased circuit board creepage distance. As a lamp bead configuration of circuit board, creepage distance and wiring space is contradictory. To increase the creepage distance, can only be compressed wiring space as far as possible. As far as possible avoid the use of sharp objects, in order to reduce its piercing insulation material, or the pressure breakdown caused by point discharge. Such as to minimize the use self tapping screw; Appropriate application of copper circuit board design, right Angle and excessive treatment etc.