Title:
ALTERNATING-CURRENT (AC) MOTOR SPEED REGULATING CIRCUIT AND AIR CONDITIONER
Document Type and Number:
WIPO Patent Application WO/2018/171003
Kind Code:
A1
Abstract:
An alternating-current (AC) motor speed regulating circuit and an air conditioner. The AC motor speed regulating circuit comprises AC input terminals (L, N), a first rectifier module (10), a load (20), a second rectifier module (30), a switch module (40), and a first freewheeling module (50), a second freewheeling module (60), and an MCU (70). The first freewheeling module or the second freewheeling module provide a freewheeling loop for an induced electromotive force on winding coils of an AC motor, and the freewheeling loop passes through the existing first rectifier module and the load in the circuit, such that it is not needed to add an electronic switch for freewheeling. The first freewheeling module and the second freewheeling module in the circuit are composed of devices having a one-way conduction function, thereby greatly reducing costs. Furthermore, the MCU is not required for control during freewheeling, and freewheeling is completely implemented by a simple hardware circuit, achieving a high degree of circuit operation reliability, avoiding the problem in the prior art of device damage caused by control, and improving EMC performance of the circuit.
Inventors:
LI HONGTAO (CN)
Application Number:
PCT/CN2017/082565
Publication Date:
September 27, 2018
Filing Date:
April 28, 2017
Export Citation:
Assignee:
GUANGDONG MIDEA REFRIGERATION APPLIANCES CO LTD (CN)
International Classes:
H02P29/032
Foreign References:
| CN202385049U | 2012-08-15 | |||
| CN103633910A | 2014-03-12 | |||
| JP2014045563A | 2014-03-13 |
Attorney, Agent or Firm:
CENFO INTELLECTUAL PROPERTY AGENCY (CN)
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