A contactor power saver
A contactor and power saver technology, which is applied in the direction of electrical components, high-efficiency power electronic conversion, output power conversion devices, etc., can solve the problem of low power factor and achieve the effect of improving power factor value and constant current
Active Publication Date: 2020-02-14
SHENZHEN NANYUN MICROELECTRONICS CO LTD +1
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Problems solved by technology
For example, in the patent application number 200510029373.2, the electromagnetic coil is powered in the form of a pulse, so that the electromagnetic coil works with a constant small current; using this method will not only generate a large number of harmonics, but also the effective value of the input current does not follow the input voltage , leading to a very low power factor, according to the technology to make a prototype, the actual PF value is less than 0.3
Method used
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[0042] A contactor power saver includes a main power circuit, a bus voltage sampling circuit and a PWM control circuit. The bus voltage sampling circuit samples the bus voltage peak value after rectification, and outputs a bus voltage peak signal; the PWM control circuit detects the bus voltage peak signal, and outputs a driving signal to control the switching on and off of the switching tube in the main power circuit . The characteristics of the driving signal are: the frequency is constant, and the duty ratio is inversely proportional to the peak signal of the bus voltage.
[0043] The main power circuit includes a rectifier bridge DB1, an inductor L2, a capacitor C1, a contactor coil L1, a diode D1 and a MOS transistor Q1. The two AC input ends of DB1 are respectively connected to the AC power, the rectified positive output end of DB1 is connected to one end of L2, and the rectified negative output end of DB1 is grounded; the other end of L2 is connected to one end of C1, ...
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The invention provides an electricity saving appliance of a contactor. The electricity saving appliance comprises a main power circuit, a bus voltage sampling circuit and a PWM control circuit. The bus voltage sampling circuit samples a rectified bus voltage peak and outputs a bus voltage peak signal. The PWM control circuit detects the bus voltage peak signal, and outputs a driving signal to control ON / OFF of a switch tube in the main power circuit. The bus voltage peak is detected so that a product of a driving duty ratio and the bus voltage peak is invariant, a power factor (PF) value of the electricity saving appliance of the contactor is improved, and a current of a contactor coil is invariant within a wide voltage input range.
Description
technical field [0001] The invention relates to the field of AC contactors, in particular to a contactor power saver with power factor correction function. Background technique [0002] The traditional contactor operating system consists of a coil, a static iron core, an armature and a reaction spring. When the contactor coil is energized, a suction force is generated between the static iron core and the armature. When the suction force is greater than the spring reaction force, the armature is attracted to the static iron core until it contacts the static iron core. At this time, the main contact is closed. This process is called suction. combined process. The process in which the coil is continuously energized, the armature is in contact with the static iron core, and the main contacts are in a closed state is called the holding process. When the current in the coil is reduced or interrupted, the suction force of the static iron core to the armature decreases. When the s...
Claims
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IPC IPC(8): H02M1/42
CPCH02M1/4225Y02B70/10
Inventor 尹向阳苏俊熙
Owner SHENZHEN NANYUN MICROELECTRONICS CO LTD