Protection circuit for instantaneous surge overvoltage when starting up
A protection circuit and instantaneous shock technology, which is applied in the field of protection circuit for instantaneous shock and overvoltage at startup
Active Publication Date: 2019-01-15
HUIZHOU SANGNIWEI SOLAR ENERGY TECH CO LTD
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Problems solved by technology
According to the driver chip specification, the AC (Alternating Current) input voltage range of the MP4001 driver chip is 85V-305V, but when the AC input voltage is 305V, the peak voltage at the moment of power-on is higher than 500V, and it is easy to burn out if the voltage is too high MP4001 drives the internal high-voltage LDO (Low Dropout Regulator, low dropout linear regulator) component of the chip. Therefore, it is necessary to provide a protection circuit to prevent the internal LDO component of the drive chip from being burned when the instantaneous voltage is too high.
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[0024] Hereinafter, a number of embodiments of the present invention will be disclosed in drawings. For clear description, many practical details will be described in the following description. However, it should be understood that these practical details should not be used to limit the present invention. In other words, in some embodiments of the present invention, these practical details are unnecessary. In addition, in order to simplify the drawings, some conventionally used structures and components will be shown in simple schematic ways in the drawings.
[0025] It should be noted that all the directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the difference between components in a specific posture (as shown in the accompanying drawings). If the relative positional relationship, movement situation, etc. change, the directional indication will change accordingly.
[0026] In addition, in...
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The present invention discloses a protective circuit for instantaneous overvoltage when starting up, which includes a rectification and filtering branch, which receives a first voltage signal and rectifies and filters the first voltage signal to output a second voltage signal; a passive power factor correction branch has a Electric point, the second voltage signal is adjusted to the third voltage signal and output from the power-taking point, the voltage value of the third voltage signal is half of the second voltage signal; and the driving branch, including the driving chip and the peripheral driver connected to the driving chip branch; the power supply pin of the driver chip is connected to the power-taking point; the peripheral driver sub-branch drives the load connected to it under the control of the driver chip. The first voltage signal is first rectified and filtered into a second voltage signal, and the passive power factor correction branch adjusts the second voltage signal to a third voltage signal, so that the voltage value of the third voltage signal is reduced to half of the voltage value of the second voltage signal , the third voltage signal is input into the driver chip, and the LDO component in the driver chip will not be burned.
Description
Technical field [0001] The present invention relates to the technical field of technical LED driving, in particular to a protection circuit for impact overvoltage at the moment of startup. Background technique [0002] MP4001 driver chip usually drives the load LED together with the driver circuit connected to its periphery to make the LED work normally. According to the driver chip specification, the AC (Alternating Current) input voltage range of the MP4001 driver chip is 85V-305V, but when the AC input voltage is 305V, the peak voltage is higher than 500V at the moment of startup, and the voltage is too high and it is easy to burn MP4001 drives the internal high-voltage LDO (Low Dropout Regulator) components of the chip. Therefore, it is necessary to provide a protection circuit to prevent the internal LDO components of the drive chip from being burned when the voltage is too high at the moment of startup. Summary of the invention [0003] Aiming at the shortcomings of the pri...
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IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/50Y02B20/30
Inventor 陈泽雄
Owner HUIZHOU SANGNIWEI SOLAR ENERGY TECH CO LTD