Voltage following device, method and variable frequency drive control loop
A technology of voltage following and variable frequency drive, which is applied in the direction of AC motor control, low-speed motor control, control system, etc., can solve the problems of inability to realize real-time adjustment, drive efficiency and reliability reduction, etc., and achieve low implementation cost, optimized service life, The effect of a wide range of load applications
Active Publication Date: 2021-05-11
RUKING EMERSON CLIMATE TECH SHANGHAI CO LTD
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Problems solved by technology
[0004] In view of the above-mentioned shortcomings of the prior art, the object of the present invention is to provide a voltage following device, method and variable frequency drive control circuit, which are used to solve the problem that the bus voltage in the variable frequency drive circuit in the prior art remains higher than the natural rectified voltage for a long time. state, it is impossible to realize real-time adjustment, resulting in the problem of reduced driving efficiency and reliability
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[0036] Embodiments of the present invention are described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes, and various modifications or changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, in the case of no conflict, the following embodiments and features in the embodiments can be combined with each other.
[0037] It should be noted that the diagrams provided in the following embodiments are only schematically illustrating the basic ideas of the present invention, and only the components related to the present invention are shown in the diagrams rather than the number, shape and shape of the compo...
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The present invention provides a voltage following device, method and variable frequency drive control loop; the voltage following device includes a rectifier module, an inverter drive module, a step-down module, a voltage sampling module, a current sampling module and a voltage following control module; the inverter drive The output terminal of the module is connected with the current sampling module; the current sampling module is used to collect the current current; the voltage sampling module is used to collect the current bus voltage; the voltage following control module is used to calculate the current running speed of the load according to the current current, and according to the current running speed and the current bus voltage to perform boost operation or step-down operation; the present invention determines the reference bus voltage for a given control rectifier module to perform boost and step-down module to perform step-down by judging the different rotational speeds of the load, so as to realize real-time regulation of the bus voltage , to ensure that the bus voltage of the variable frequency drive control loop is in the optimal state in real time, thereby improving its drive efficiency and reliability.
Description
technical field [0001] The invention belongs to the field of air conditioners, and in particular relates to a voltage following device, method and frequency conversion drive control loop. Background technique [0002] With the increasing energy efficiency requirements of various commercial air-conditioning inverters, more and more air-conditioning compressor manufacturers are looking for a combination of compressors and variable frequency drives with higher overall efficiency. Compressors with high back EMF have high load efficiency and drive The advantage of small current is gradually being widely used. [0003] In order to drive high back electromotive force compressors, the bus voltage of the variable frequency drive is also designed to be higher accordingly. The frequency converter with three-phase PWM rectifier has the advantage of being able to adjust the bus voltage to a high back electromotive force compressor. The power frequency conversion industry has attracted m...
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IPC IPC(8): H02P27/06H02M5/458H02M3/156H02P23/03H02P25/16
CPCH02M3/156H02M5/4585H02P23/03H02P25/16H02P27/06
Inventor 李浩徐文珍赵云龙
Owner RUKING EMERSON CLIMATE TECH SHANGHAI CO LTD