Permanent magnetic machine controller based on pulse modulation technology
A technology of pulse width modulation and permanent magnet mechanism, which is applied in the direction of electromagnetic relay, protection switch operation/release mechanism, relay, etc., can solve the problems of random program flying, dead cycle damage, and affecting the normal operation of the system, so as to overcome the reduction of reliability , the number of components is small, the effect of simple circuit structure
Inactive Publication Date: 2009-07-22
XI AN JIAOTONG UNIV
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[0005] At present, the research on permanent magnet mechanism controllers is mostly concentrated on traditional permanent magnet mechanism controllers, but because the control principle of the new permanent magnet mechanism that can be automatically broken without opening control is different from that of traditional permanent magnet mechanisms, so for this new type There is still little research on the controller of the permanent magnet mechanism
In addition, the existing controllers generally introduce microprocessors. Although the microprocessor can realize the intelligent control of the opening and closing of the traditional permanent magnet mechanism, there are still some deficiencies, which are mainly manifested when the switching appliances are operating in harsh working environments. , due to many sources of interference may cause the software and hardware of the microprocessor to fail to work normally, for example: the hardware part, usually the microprocessor has a reset pin for system reset, but the reset circuit is susceptible to interference from power fluctuations, when the microprocessor After the processor power supply is disturbed, when the voltage drops to a low level, the potential of the reset terminal also drops to a low level, making the microprocessor unable to work normally; Affected, there will be a phenomenon of dead cycle, or the phenomenon of program "flying randomly", which will affect the normal operation of the system
The above factors will reduce the working stability and reliability of the controller
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[0026] 1. The control principle of the new permanent magnet mechanism and the structural design of the controller
[0027] 1) The control principle of the new permanent magnet mechanism
[0028] Different from the working principle of the traditional permanent magnet mechanism, the new permanent magnet mechanism can realize automatic breaking without opening control, and the above-mentioned improvement mainly lies in the adjustment of the control voltage of the permanent magnet mechanism. figure 1 It is a schematic diagram of the power supply voltage of the new permanent magnet mechanism coil. During the pull-in process of the permanent magnet mechanism, a DC chopping voltage with a high duty ratio or an equivalent DC pull-in voltage U is applied to both ends of the coil. 等效吸合 Make the permanent magnet mechanism complete the closing movement under the action of a large electromagnetic attraction, and then the control voltage will automatically drop to a DC chopping voltage wit...
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The invention discloses a permanent magnet mechanism controller based on pulse width modulation technology, which includes a coil power supply module and a pulse width modulation control module. The coil power supply module is composed of a rectification filter circuit and a connected step-down chopper circuit; The control module is composed of a delay circuit, a control signal adjustment circuit and a PWM control circuit; its working process is: the alternating current is rectified and filtered, and the required adjustable DC chopping voltage is obtained through the step-down chopper circuit, which is added to the permanent magnet mechanism On the operating coil, the PWM control circuit outputs control pulses, and adjusts the control voltage at both ends of the coil by controlling the on-off of the power switching device in the step-down converter; The control of the magnetic mechanism has the advantages of simple circuit structure, small size, stable control process, strong anti-interference ability and low cost.
Description
technical field [0001] The invention belongs to the field of medium and low-voltage electrical appliances of power transmission and distribution equipment, and relates to a permanent magnet mechanism controller, in particular to a permanent magnet mechanism controller based on pulse width modulation technology. Background technique [0002] Due to the unique advantages of the DC grid structure, there is a tendency to transition from the traditional low-voltage AC radial network to the medium-voltage AC / DC ring network in the field of ship power. Therefore, research on medium-voltage DC power systems and supporting equipment has become a worldwide hotspot. For the medium-voltage DC grid, the lack of DC circuit breakers makes it one of the important links in the study of DC network protection actions. Due to the unique advantages of the permanent magnet mechanism and its successful application in the field of vacuum circuit breakers and contactors, the permanent magnet operat...
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IPC IPC(8): H01H71/32H01H51/00H01H47/02H02M7/5395
Inventor荣命哲刘懿莹王小华吴翊潘晨曦
OwnerXI AN JIAOTONG UNIV