Output overvoltage protection method and system of indirect output voltage division setting circuit
A technology of output voltage and overvoltage protection, applied in the direction of protection against overvoltage, measuring current/voltage, measuring devices, etc., can solve the problems of large output changes, the influence of overvoltage protection voltage, and the addition of peripheral components, etc., to achieve Reduce the overall cost and ensure the effect of output accuracy
Active Publication Date: 2019-01-25
CRM ICBG (WUXI) CO LTD
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Problems solved by technology
[0007] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide an output overvoltage protection method and system for an indirect output voltage division setting circuit, which is used to solve the problem of the overvoltage protection voltage being affected by the inductance in the prior art , resulting in large output changes, poor accuracy, and the need to increase external components, high cost
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Embodiment
[0047] This embodiment provides an output overvoltage protection method of an indirect output voltage division setting circuit, such as figure 2 As shown, the output overvoltage protection method of the non-direct output voltage divider setting circuit includes:
[0048] S201. Obtain equivalent relational expressions of the output voltage, input voltage, turn-on time, and turn-off time of the indirect output voltage divider setting circuit according to the principle of magnetic balance. For example, if the topological structure of the indirect output voltage divider setting circuit is a step-down structure, then its relational expression obtained according to the principle of magnetic balance is (V IN -V O )×T ON =V O × T OFF , and then the output voltage of the topology is obtained, where, V IN is the input voltage of the topology, T ON is the turn-on time of the topology, T OFF is the turn-off time of the topology. If the topological structure of the indirect output...
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The invention provides an output overvoltage protection method and an output overvoltage protection system of a non-direct output voltage voltage division setting circuit. The above mentioned method is characterized in that the equivalent relation of the output voltage, the input voltage, the switching-on time, and the switching-off time of the non-direct output voltage voltage division setting circuit can be acquired according to the magnetic balance principle; the input voltage can be acquired by adopting the voltage division way; the output voltage detection value related to the switching-on time or / and the switching-off time can be acquired by adopting the input voltage in a controlled manner; the overvoltage protection voltage setting value related to the switching-on time or / and the switching-off time can be acquired by adopting the overvoltage protection resistance in a controller manner; and the output voltage detection value can be compared with the overvoltage protection voltage setting value; when the output voltage detection value is greater than the overvoltage protection voltage setting value, the overvoltage protection can be trigged. The acquired output voltage protection precision is only relevant to the chip and the set resistance precision, and is not relevant to other devices.
Description
technical field [0001] The invention belongs to the technical field of electronic circuits, and relates to an overvoltage protection method and system, in particular to an output overvoltage protection method and system of an indirect output voltage division setting circuit. Background technique [0002] When the power supply voltage of the protected line is higher than a certain value, the protector cuts off the line; when the power supply voltage returns to the normal range, the protector automatically turns on. This protection process can be called overvoltage protection (OVP). The purpose of overvoltage protection is to protect subsequent circuits from being damaged by load dump or instantaneous high voltage. [0003] Usually, the detection signal of the output voltage is collected through resistor voltage division, and then the detection signal is used for overvoltage protection control. However, in some floating output occasions, it is impossible to directly perform o...
Claims
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IPC IPC(8): H02H3/20G01R19/00
Inventor 刘军吴泉清卢圣晟任会远吴校民
Owner CRM ICBG (WUXI) CO LTD