Control method of relay for one-phase smart electric meter
A relay control, smart meter technology, applied in electrical program control, program control in sequence/logic controllers, instruments, etc., can solve problems such as adhesion, high failure rate, easy burnout of thyristor, and reduce failures. rate, improve reliability, reduce inrush current and the effect of arcing
Active Publication Date: 2014-03-19
SHANGHAI BEILING
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Problems solved by technology
The problem with this control method is that when the user has a certain load, the contacts of the magnetic latching relay are easily burned out or stuck, and the failure rate is high
[0003] In the traditional zero-crossing switching method, the zero-crossing control is mostly realized by using a thyristor and a magnetic latching relay in parallel. When the harmonics on the power line are relatively large, the thyristor is easy to burn out. In addition, due to material limitations and cost reasons, it cannot be used in smart relays. Meters are used in
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[0035] see figure 1 To and Figure 4 In order to better understand the technical solution of the present invention, the inventors of the present invention will describe in detail below through specific embodiments in conjunction with the accompanying drawings:
[0036] see figure 1 , single-phase smart meters such as figure 1 As shown: it includes a metering chip 1, a main controller 2, a drive circuit 3, a relay 4, a current sampling circuit 5, a voltage sampling circuit 6, a transformer 7 and a power failure detection circuit 8. The input ends of the current sampling circuit 5 and the voltage sampling circuit 6 are respectively connected to the mains power supply for collecting current signals and voltage signals of the mains power supply. The input terminal of the metering chip 1 is connected to the output terminals of the current sampling circuit 5 and the voltage sampling circuit 6 , and the output terminal is connected to the pulse signal input terminal of the main co...
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The invention discloses a control method of a relay for a one-phase smart electric meter. The control method comprises the steps that a metering chip of the one-phase smart electric meter acquires a voltage zero crossing point and a power factor angle of a mains supply, and then a voltage and current zero crossing time interval Tj of the mains supply is obtained; a controller of the one-phase smart electric meter outputs a turn-off control signal to a driving circuit of the one-phase smart electric meter at T-Toff+Tj after the voltage zero crossing point, or the controller of the one-phase smart electric meter outputs a turn-on control signal to the driving circuit of the one-phase smart electric meter at T-Ton after the voltage zero crossing point, and the turn-off or turn-on of the relay can be achieved. The control method has the advantages that the relay for the one-phase smart electric meter can be turned off at the time of a current zero crossing point and turned on at the time of the voltage zero crossing point, occurrence of instantaneous flashy flow and electric arc of a contact switch of the relay for the one-phase smart electric meter is reduced, the failure rate of the relay for the one-phase smart electric meter is decreased, and reliability of the one-phase smart electric meter is improved.
Description
technical field [0001] The invention relates to the field of smart meters, in particular to a relay control method for a single-phase smart meter. Background technique [0002] The single-phase smart meters used in China generally have a control function, which can cut off the power to the user when the user is in arrears. At present, the common implementation method is to directly control the magnetic latching relay through the driving circuit. After receiving the power off or power transmission command, the single-phase smart meter immediately sends a pulse signal to the magnetic latching relay, and the magnetic latching relay is turned off or closed. The problem with this control method is that when the user has a certain load, the contacts of the magnetic latching relay are easily burned out or stuck, and the failure rate is high. [0003] In the traditional zero-crossing switching method, the zero-crossing control is mostly realized by using a thyristor and a magnetic ...
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Login to View More IPC IPC(8): G05B19/04G01R22/06
Inventor 石飞靳磊傅代军
Owner SHANGHAI BEILING