Surge protection circuit and surge protection method
A technology of surge protection and surge voltage, applied in the electronic field, can solve problems such as surge voltage rise and filter circuit unable to protect against surge
Active Publication Date: 2018-08-28
SIEMENS AG
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Problems solved by technology
[0004] This prior art generally takes measures when the surge is small, but in some environments, the surge voltage may increase, and a simple filter circuit cannot perform more effective surge protection
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[0055] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Apparently, the described embodiments are only some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0056] An embodiment of the present invention provides a surge protection circuit, the surge protection circuit may include: a first series circuit and at least one second series circuit, wherein,
[0057] The first series circuit is composed of at least two TVS (Transient Voltage Suppressors) connected in series, one end of the first series circuit is connected to a positive terminal, and the other end is connected to a negative terminal;
[0058] The se...
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The present invention provides a surge protection circuit and a surge protection method. The surge protection circuit may include: a first series-connected line formed by at least two TVSs connected in series, wherein one end of the first series-connected line is connected to a positive terminal and the other end is connected to a negative terminal; and at least one second series-connected line formed by at least one TSS, wherein one end of the second series-connected line is connected between the at least two TVSs in the first series-connected line, and the other end is grounded. The first series-connected line is connected in parallel to a protected circuit of a device; when a differential-mode surge voltage appears at the two ends of the first series-connected line, by using the first series-connected line, a voltage of a backend connection circuit is clamped to a first voltage value; and when a common-mode surge voltage appears at the two ends of the first series-connected line tothe ground end, respectively, by using the first series-connected line and the second series-connected line, voltages to ground of the positive terminal and the negative terminal are reduced to a second voltage value. More effective surge protection can be provided according to this solution.
Description
technical field [0001] The invention relates to the field of electronic technology, in particular to a surge protection circuit and a surge protection method. Background technique [0002] In some power or signal circuits, surges often occur. Surges are caused by switching and lightning transient overvoltages. Surges may cause abnormal operation or even damage to equipment in the circuit. [0003] For industrial measurement and control equipment under normal use conditions, such as field instruments, the surge voltage that may be caused by the environment is relatively low. For example, the surge voltage required for industrial measurement and control equipment specified in IEC61326 is 1kV. In order to achieve surge protection, a filter circuit can be used to protect the equipment. When a surge voltage occurs, the filter circuit will filter the surge voltage to avoid excessive voltage of the protected circuit at the back end, thereby realizing surge protection. [0004] Thi...
Claims
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IPC IPC(8): H02H9/04H04M1/00H04M1/18
CPCH02H9/042H02H9/044
Inventor 埃里克·谢米斯凯胡飞凰闵令宝卓越
Owner SIEMENS AG