The device for protecting over voltage of AC and method for controlling the same
A technology of a protection device and a control method, which is applied in the directions of emergency protection circuit devices for limiting overcurrent/overvoltage, protection reacting to overvoltage, emergency protection circuit devices, etc., and can solve problems such as capacitor heating, capacitor oil leakage, Problems such as capacitor overcharging
Inactive Publication Date: 2007-03-14
LG ELECTRONICS(NANJING) PLASMA CO LTD
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[0008] As mentioned above, in the prior art, the AC overvoltage protection device 101 is realized by increasing the capacity value of the smoothing capacitor 104, so that the required cost of the smoothing capacitor 104 will increase geometrically; The larger the capacity value, the larger the size of the parts, and the problem of inefficiency in space utilization.
[0009] Also, when the AC overvoltage is input, if the temperature of the header reaches 150 degrees or more due to the heat generated by the main power supply IC (Integrated Circuit) 102, the power supply will be turned off due to the TSD (Thermal Protection Device) function, and the During this period of time, the capacitor will be overcharged, which will lead to problems such as heating of the capacitor and oil leakage around the capacitor.
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[0042] The present invention will be described in detail below with reference to the accompanying drawings.
[0043] Referring to FIG. 2, the AC voltage protection device in the present invention will be described as follows.
[0044] AC overvoltage protection device 201 implements the present invention, and includes electrolytic capacitor 204, standby start time delay unit 205, reverse voltage prevention unit 206, standby power supply IC 203, main power supply IC 202, and the like. However, there is no limitation on the characteristics of the AC overvoltage protection device 201 , for example, it can be implemented in video devices such as televisions.
[0045] When the first rectified voltage, that is, the positive terminal voltage of the electrolytic capacitor 204 exceeds the critical voltage, the reverse voltage prevention unit 206 judges this to output a predetermined voltage to the standby power supply IC 203 .
[0046] However, the critical voltage here is preferably t...
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Disclosed is an AC overvoltage protective device and method for controlling the same relating to an overvoltage protective device and method for controlling the same. The protective device comprises the following parts: a back voltage preventing part for outputting assigned voltage; an on call power source supplying integrated circuit for switching to lock status; an on call starting time delaying part containing more than one resistance; a main power source supplying integrated circuit for terminating the power source supplying to all the integrated circuits. The control method comprises the following steps:(a) a step of outputting assigned voltage; (b) a step of switching the on call power source supplying integrated circuit to lock status; (c) a step of prolonging the starting time of the on call power source supplying integrated circuit with more than one resistance; (d) a step of stopping the power source supplying to all the integrated circuits. The present invention is capable of preventing the problems caused by overcharging of the capacitor, and has favorable advantages in the aspects of cost and space efficiency.
Description
technical field [0001] The invention relates to an overvoltage protection device and a control method thereof, in particular to a high-efficiency AC overvoltage protection device and a control method thereof. Background technique [0002] In imaging devices and the like, the power source for starting the circuit may be AC (alternating current) voltage. [0003] However, the allowable AC voltage of the above-mentioned imaging devices is not always constant, and unexpected AC overvoltages are allowed due to changes in the use environment. In addition, AC overvoltages can also be allowed due to abnormal detection during the production process. . [0004] FIG. 1 is a block diagram of an AC overvoltage protection device in the prior art. Next, referring to FIG. 1 , an AC overvoltage protection device in the prior art will be described. [0005] First, in the past there was no protection circuit, but in many cases overcurrent based protection circuits and devices were used. ...
Claims
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Login to View More IPC IPC(8): H02H7/20H02H9/04
CPCH02H3/20H04N5/63
Inventor李南昊
OwnerLG ELECTRONICS(NANJING) PLASMA CO LTD