A switch control method and device
A technology of switch control and controlled switch, which is applied in the direction of circuit devices, emergency protection circuit devices, emergency protection circuit devices for limiting overcurrent/overvoltage, etc., and can solve problems such as arcing in relays and affecting the service life of switching devices , to achieve the effect of easy realization, prolonging the service life and avoiding the generation of arc
Active Publication Date: 2017-12-05
JAECELE ELECTRIC
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Problems solved by technology
Due to product size and other reasons, usually only 5A relays can be selected, so an arc will be generated when the relay is disconnected, which will affect the service life of the switching device
Method used
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Embodiment Construction
[0018] The invention provides a switch control method, such as figure 1 The method shown includes:
[0019] S1: when the controlled switch needs to be turned off, collect the pulsed DC voltage at both ends of the controlled switch. Specifically, the current flowing through the controlled switch must be a pulsed direct current, for example, a direct current signal obtained by rectifying an alternating current signal with a diode, and the controlled switch may be a relay. There are many ways to know that the controlled switch needs to be turned off, for example, it may be receiving a driving signal sent by the controlled switch driving circuit.
[0020] S2: Comparing the response time of the controlled switch with the period of the waveform of the pulsed DC voltage. figure 2 It shows the waveform diagram of the pulsed DC voltage at both ends of the controlled switch. According to the waveform, the periodic characteristics of the pulsed DC voltage signal can be known, for exam...
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The present invention provides a switch control method and device. The method includes: when a controlled switch needs to be disconnected, collecting a pulsed DC voltage across the two ends of the controlled switch; and comparing the response time of the controlled switch with the pulse The cycle of the waveform of the DC voltage is compared; according to the result of the comparison, the moment when a disconnection signal is sent to the controlled switch is determined, so that the controlled switch is disconnected within the time period when the pulsed DC voltage is 0. The switch control method and device provided by the present invention can control the controlled switch to be disconnected within a time period when the voltage at both ends of the controlled switch is 0, completely avoids the generation of arc, realizes the purpose of extinguishing the arc, and improves the safety of the controlled switch , Extend the service life of the controlled switch. Since the present invention provides a time period that allows the controlled switch to perform the disconnection action, the requirements for the hardware parameters of the controlled switch are not very strict, and it is relatively easy to implement in practical applications.
Description
technical field [0001] The invention relates to the field of electric appliance control, in particular to a switch control method and device. Background technique [0002] When the existing circuit breaker is turned on, it relies on connecting a DC coil to generate a magnetic field, and the purpose of turning on the circuit breaker is achieved by the suction force of the magnetic field. The power supply for the DC coil is a pulsed DC power supply obtained by rectifying the 220V AC through a diode. The switching on and off of the DC coil is controlled by a switching device (such as a relay). The resistance of the DC coil is very small, so the current of the coil is very large when it is switched on. Due to product size and other reasons, usually only 5A relays can be selected, so an arc will be generated when the relay is disconnected, which will affect the service life of the switching device. Contents of the invention [0003] Therefore, the technical problem to be solv...
Claims
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IPC IPC(8): H02H9/08
Inventor 刘永华徐军明彭全昌李连昌
Owner JAECELE ELECTRIC