Pulse controller of control and protection switching device
A technology of pulse controller and protection switch, which is applied in the direction of overcurrent protection, instrumentation, and measuring power, which can solve problems such as tripping malfunction and incomplete release of electric energy, and achieve high reliability and low cost , small size effect
Active Publication Date: 2014-01-29
SEARI ELECTRIC TECH +1
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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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[0019] In general, the solution of the present invention is: when the circuit unit in the control and protection switching device is in the process of rapid change of power supply, such as during power-on and power-off, the output signal of the pulse trigger circuit is prohibited; when the circuit unit is in During normal working conditions, the output signal of the above-mentioned pulse trigger circuit is recovered.
[0020] The function of the prohibition / restoration pulse trigger circuit can be realized by a level conversion circuit. When in the process of power-on and power-off, the level conversion circuit sets the level signal at the output end of the above-mentioned pulse trigger circuit to low level; when in normal working condition, the microprocessor circuit outputs a high-level signal, Control the level conversion circuit, and set the signal at the output end of the pulse trigger circuit as low level.
[0021] figure 1 A circuit structure diagram of a pulse contro...
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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...
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Login to View More IPC IPC(8): H02H3/08G01R31/02
Inventor 顾长恂张地余飞季慧玉曾萍贾峰奚泓
Owner SEARI ELECTRIC TECH