Pulse Controller for Control and Protection of Switching Appliances

Abstract

The invention discloses a pulse controller of a control and protection switching device. The pulse controller comprises a pulse trigger circuit, a control circuit and a level converting circuit. The pulse trigger circuit outputs pulse trigger signals. The control circuit outputs control signals. In a normal working stage, the control signals are high level; in power-on and power-off stages, the control signals are high level. The level converting circuit is connected to the pulse trigger circuit and the control circuit. The level converting circuit receives the pulse trigger signals and the control signals and performs level conversion. Signals subjected to level conversion are output to a tripping circuit. On the basis that quick judgment of short circuit signals is guaranteed, mistaken tripping of the control and protection switching device due to malfunction of a tripper caused by mistaken signal output is avoided fundamentally during quick change of a power supply. The pulse controller used in the control and protection switching device has the advantages of high reliability, low cost and small size.

Description

technical field [0001] The invention relates to the field of low-voltage electrical appliances, and more specifically relates to a pulse controller suitable for controlling and protecting switching electrical appliances. Background technique [0002] Control and protection switchgear is a switchgear that can be automatically controlled in addition to manual control, with or without local manual operation devices, and can be connected, loaded and broken under normal conditions including specified operating overload conditions. And it can connect, carry and break the current under the specified abnormal conditions within the specified time, such as short-circuit current, that is, the control and protection switching device integrates the functions of circuit breaker, contactor and thermal relay. [0003] The Chinese patent application with application number 201010258781.6 discloses a multifunctional circuit for controlling and protecting switching devices, including a micropr...

AI Technical Summary

Problems solved by technology

Since the capacitor is used to determine the delay time, and the capacitor may have a phenomenon that the electric energy has not been fully released after the last circuit power-off during the frequent power-on and power-off of the circuit, so in the next power-on process, the delay time determined by it The delay time will be shorter than the estimated time required in the literature, resulting in premature output of the input signal processed by the steady state to the drive circuit, causing the trip unit to malfunction

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