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Switching tube junction temperature detection method, motor controller, motor control system and medium

A technology of motor control and detection method, which is applied in the direction of control system, motor control, AC motor control, etc. It can solve the problems of affecting the temperature protection of switching devices, inaccurate temperature detection of switching devices, and limited sensing ability of internal temperature changes of switching devices. achieve high accuracy

Pending Publication Date: 2022-04-05
GUANGDONG WELLING ELECTRIC MACHINE MFG
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  • Application Information

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Problems solved by technology

Among them, the conventional temperature protection method for discrete switching devices is usually to use a temperature resistance around the switching device for temperature protection. Although this method provides temperature sensing capability, because the temperature resistance receives the spatial radiation temperature of the switching device, Affected by the installation position of the temperature resistor, this method has limited ability to sense the internal temperature change of the switching device, resulting in inaccurate temperature detection of the switching device, which in turn affects the temperature protection of the switching device

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  • Switching tube junction temperature detection method, motor controller, motor control system and medium
  • Switching tube junction temperature detection method, motor controller, motor control system and medium
  • Switching tube junction temperature detection method, motor controller, motor control system and medium

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Embodiment Construction

[0034] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0035] In an embodiment of the present invention, the motor control system may include: a three-phase inverter bridge, which is used to drive the motor to work.

[0036] Specifically, refer to figure 1 As shown, the three-phase inverter bridge includes a U-phase bridge arm, a V-phase bridge arm and a W-phase bridge arm. The U-phase bridge arm includes an upper tube VT1 and a lower tube VT4, and the V-phase bridge arm includes an upper tube VT3 and a lower tube VT6. The W-phase bridge arm includes an upper transistor VT5 and a lo...

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Abstract

The invention discloses a switching tube junction temperature detection method, a motor controller, a motor control system and a medium, the motor control system comprises a three-phase inverter bridge for driving a motor to work, and the method comprises the following steps: determining tube voltage drop and conduction current when a lower tube of at least one phase bridge arm in the three-phase inverter bridge is conducted; according to the tube voltage drop and the conduction current, determining the conduction resistance when the lower tube of the at least one phase of bridge arm is conducted; and determining the lower tube junction temperature of at least one phase of bridge arm according to the on-resistance. According to the method, the on-resistance is calculated according to the tube voltage drop and the on-current, and the junction temperature of the lower tube is determined based on the on-resistance, so that the obtained junction temperature of the lower tube has relatively high accuracy.

Description

technical field [0001] The invention relates to the technical field of motor control, in particular to a method for detecting junction temperature of a switch tube in a motor control system, a motor controller, a computer-readable storage medium and a motor control system. Background technique [0002] In the field of home appliance motor control or small light electric vehicle control, based on cost and space considerations, motor controllers mostly use single-resistor current sampling to control the motor, and large-scale switching devices are implemented using discrete devices. Among them, the conventional temperature protection method for discrete switching devices is usually to use a temperature resistance around the switching device for temperature protection. Although this method provides temperature sensing capability, because the temperature resistance receives the spatial radiation temperature of the switching device, Affected by the installation position of the te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P29/68H02P27/08
CPCH02P27/08H02P29/68
Inventor 宾宏张凯赵小安申云松
Owner GUANGDONG WELLING ELECTRIC MACHINE MFG
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