I. Basic concept of variant air conditioning
(i) conventional air conditioning (rf air conditioning)
1. Use of general fixed frequency compressors
2. Compressors operate at a fixed frequency of 50 hz or 60 hz
3. Refrigeration, heat retention of output
4. Control methods are simple and are controlled and activated using relays, compressors
Control circuit charts:
(ii) variable frequency air conditioning
1. Use of variable-frequency compressors (subsequently divided into three-phase communication sensors, non-swipe current machines and inert synchronized exchange machines, etc.)
2. Compressor frequency between 20 hz and 130 hz mutable
3. Refrigeration, heat preparation capabilities of output vary according to frequency of operation
4 control methods are complex and require a dedicated variable frequency drive circuit and the corresponding drive control core snippets
Fac control circuit framework:
Modular compressor control principles:
Mob compressor rationale: n=60f(1-s)/p
(n-compressor velocity, f-compressor power frequency, p-engine polar logarithm, s-turn rate)
By changing the frequency of the compressor,f the rate of operation of the compressor will change as the frequency of the compressor changes。
(iii) exchange-frequency air conditioners
1. Compressors use a three-phase communication sensory aerodynamics
2-drive voltage using cross-direct-turning
3. A voltage space vector control approach
4. The frequency of operation of the compressor changes according to the driver's voltage, forming a v-f conic。
(iv) straight current frequency air conditioning
1. Compressors employ a straight current without a brush (or a constant magnetic synchronized exchange)
2. The unbrushed straight current circuits are distributed around them; the constant magnetic synchronized exchange circuits are centralized around them
3. Driver voltage is also a cross-direct-turner
4. The driver approach is based on a square wave drive (distribution volts) and a sine drive (concentrated volume)
Location testing and electronic re-engineering are required。
(v) full current frequency air conditioners
Compressors use straight-flow frequency compressors, and indoor and outdoor winders use no-brush straight-flow machines, known as 3d air conditioners, and also indoor or outdoor wind machines are common exchange machines. The aim of ac is to save electricity, save energy and increase energy efficiency ratio, while the performance of a direct-flower is better than that of a general exchange machine, such as a high starter rectangular and low noise. The control circuits of direct currents are complex and the control of inappropriate machines is prone to burning, and therefore the quality risks are greater and more expensive than those of traditional communication machines. When technology for the control of circuits and controls has matured, full-current fcf is one of the directions of the high-end ac。
Ii. Elements for various flight control
In contrast to the frequency sets, the transmissions have more electrical controls than the outdoor and communications components. The electrical controls of the variants are therefore more complex, and the focus is on outdoors。
In general, the basic components of the electrical controls of the variants are as follows:
Iii. Relationship of the variant module to compressor
Frequency module:
The variable frequency module, also known as the intelligent power module module, is a key device for achieving the transition from direct current to communication and thus driving the operation of the compressor. It is an intelligent power module that binds six igbt tubes together with their drive circuits and multiple protective circuit seals, thus simplifying the design and improving the reliability of the entire system。
Main manufacturers: mitsubishi, sanyang, fairy boy
Iv. Summary of ipm modules
