Direct current compressor drive circuit

A technology of DC compressor and drive circuit, applied in the direction of DC motor speed/torque control, AC motor control, electrical components, etc., can solve the problems of high hardware cost and high product competition pressure, so as to reduce hardware cost and ensure control Quality and the effect of improving market competitiveness

Inactive Publication Date: 2010-09-29
HISENSE (SHANDONG) AIR CONDITIONING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem that the existing DC compressor driving circuit must use an MCU chip with at least 6 PWM output ports to realize the driving control, the hardware cost is high and the product competition pressure is high, and a new DC compressor is provided. The motor drive circuit adopts the port expansion design to reduce the requirements on the port resources of the MCU chip, so that the 120-degree drive control of the DC compressor can be realized only by using the MCU chip with at least 2 PWM output ports, which greatly reduces the Reduced hardware costs and enhanced the market competitiveness of products

Method used

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Examples

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Embodiment 1

[0034] Example 1, see Figure 5 As shown, this embodiment takes the MCU chip IC101 with four PWM output ports as an example to specifically describe the connection structure between it and the inverter circuit IPM.

[0035] The MCU chip IC101 itself has four PWM output ports, namely RC5, RC4, RC3, RC2. The four PWM outputs cannot meet the control requirements of the three-phase DC motor. Therefore, one of the PWM output ports needs to be expanded to Realize 6-way PWM output.

[0036] like Figure 5 As shown, the 3 PWM output ports RC3, RC4 and RC5 of the MCU chip IC101 are directly connected to the three-phase DC positive terminals Up, Vp and Wp of the inverter circuit IPM in a one-to-one correspondence, and the fourth PWM output port RC2 is connected to a multi-channel Select the common terminal of the circuit. The multi-channel selection circuit can be implemented by a 4-channel selection chip IC102, whose common terminal CY is connected to the fourth PWM output port RC2 ...

Embodiment 2

[0037] Example 2, see Image 6 As shown, this embodiment specifically describes the implementation structure of the DC compressor rotor position detection circuit.

[0038] The three-phase electromotive force voltages S_W, S_V, S_U sampled from the three-phase terminals of the DC compressor are limited by the voltage divider and current limiting network composed of resistors R301 / R302 / R303, R304 / R305 / R306, R307 / R308 / R309 respectively. After the summation and voltage division processing, the non-inverting input terminal of the comparator IC03 is connected, and the comparator IC03 can be specifically implemented by an operational amplifier chip. The inverting input terminal of the comparator IC03 is connected to the DC bus through a voltage divider and current limiting network composed of resistors R312, R316, and R317, and the DC bus voltage DC+ is divided and used as a reference voltage. Since the rotation of the compressor rotor will generate back EMF, and the magnitude of t...

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Abstract

The invention discloses a direct current compressor driving circuit, which comprises an MCU and an inversing circuit, wherein the inversing circuit comprises two groups of controlling signal ends which are six paths, namely three-phase direct current positive pole ends Up, Vp, Wp and three-phase direct current negative pole ends Un, Vn, Wn, the MCU comprise at least two paths of PWM output end mouths, at least one way of PWM output end mouth is connected with a multi-channel selective circuit, the PWM output end mouth which carries out multipath expansion is correspondingly connected with thecorresponding controlling signal end of the inversing circuit, and a gating controlling end of the multi-channel selective circuit is used to receive channel selective signals which are output by theMCU. The PWM output end mouth of the MCU chip carries out the multipath expansion through designing an end mouth expanding circuit on the driving circuit, therefore driving control for 120 degrees ona direct current compressor can be realized through adopting the MCU chip with low end mouth resource and low cost, hardware cost is greatly reduced, and market competitiveness of products is increased.

Description

technical field [0001] The invention belongs to the technical field of DC compressors, and in particular relates to a circuit design for realizing 120-degree drive control of a DC compressor. Background technique [0002] The DC compressor 120-degree drive scheme is a commonly used drive technology. With the advancement of technology and the in-depth understanding of the DC compressor drive algorithm, this drive technology is no longer a technical problem. However, the current drive technology uses MCU chips dedicated to motors to achieve drive control. Such MCU chips have at least 6 PWM output ports, 3 rotor position detection and capture ports, and internal PWM timers and other resources. The high price of resource chips and the great pressure of competition in the product market are not conducive to promotion. SUMMARY OF THE INVENTION [0003] In order to solve the problems of high hardware cost and high product competition pressure caused by the fact that the existing...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P7/292H02P27/04H02P6/18
Inventor 尹发展李明波汪韬
Owner HISENSE (SHANDONG) AIR CONDITIONING CO LTD
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