Direct current variable frequency drive control system for air-conditioning coil pipe draught fan

Abstract

The invention discloses a direct current variable frequency drive control system for an air-conditioning coil pipe draught fan. The system comprises a coil pipe draught fan, a three-speed thermostat and a direct current variable frequency drive control system body; the three-speed thermostat is used for converting received alternate current voltage ACL into three sections of alternate current highvoltage signals respectively; the direct current variable frequency drive control system includes a rotate speed code circuit, a controller, an alternate current input combination circuit and a direct current variable frequency driver; the direct current variable frequency drive control system is used for converting the three sections of the alternate current high voltage signals into a direct current power supply of the direct current variable frequency driver; the direct current variable frequency drive control system is also used for converting the three sections of the alternate current high voltage signals into speed control signals and sends the signals to the controller; the controller converts the speed control signals into drive logic codes and sends the codes to the direct current variable frequency driver, and the direct current variable frequency driver converts the drive logic codes into drive control current and acts on the coil pipe draught fan. The system achieves theseamless connection between the thermostat and the direct current variable frequency driver through a current sensing circuit.

Description

technical field [0001] The invention relates to the field of drive control of an air-conditioning coil fan, in particular to a DC variable frequency drive control system for an air-conditioning coil fan. Background technique [0002] In the prior art, the main principle of the air conditioner temperature controller with three-stage speed regulation signal control is: [0003] The three-speed thermostat uses the three different wind speeds selected by the user on the panel to control different electronic switches through the internal controller, and switches the live line ACL of the AC power supply voltage into three-stage AC high-voltage signals ACL_L and ACL_M representing different speed information Together with ACL_H, these three AC high-voltage signals and the neutral line ACN are supplied to the driver of the coil fan to control the different speeds of the coil fan. [0004] In addition, the current air-conditioning coil fan DC variable frequency control driver on the...

AI Technical Summary

Problems solved by technology

However, the three-speed thermostat is often used in conjunction with the traditional AC coil fan. The application of the three-speed thermostat and the DC variable frequency drive coil fan has not yet been developed, which makes it difficult to meet the technological innovation of the fan in the market. , high efficiency and energy saving, strong environmental adaptability and diverse application requirements

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