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AC follow current circuit

A freewheeling circuit, AC power technology, applied in electrical components, output power conversion devices, etc., can solve problems such as not necessarily feasible

Inactive Publication Date: 2003-08-06
郑曙明
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing way to reduce this power loss is to connect capacitors in parallel. In situations such as speed and direction change, this method may not be feasible

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Example 1: image 3 It is a schematic diagram of the circuit principle of the present invention. One end of the single-phase AC power supply ~U~Ua(1) is connected to one end of the AC power on-off switch K(2), and the other end of the switch K(2) is connected to one end of the AC freewheeling switch Sw(4). Then connect to one end of the inductive load L (3), the other end of the inductive load L (3) is connected to the other end of the AC freewheeling switch Sw (4), and then connected to the other end of the AC power supply ~ U ~ Ug ( 5) on. In practical application, image 3 The circuits shown can be transformed into other forms.

Embodiment 2

[0058] Example 2: Figure 10 The circuit shown is one of them. It uses 4 AC power on-off switches and an AC freewheeling switch to realize the function of the freewheeling circuit. Because this circuit can realize the inversion of the AC voltage ~ UL on the load, it can realize such as Figure 11 waveform. In this way, in addition to realizing single-phase AC frequency reduction and voltage regulation, it can also output DC to realize the adjustment and polarity conversion of the DC voltage on the load. This circuit can realize the speed regulation and direction change of the DC motor. Compared with the speed regulating circuit of the existing DC motor, this circuit just replaces the DC freewheeling circuit (usually a freewheeling diode) in the existing DC motor speed regulating circuit with an AC freewheeling switch. The DC freewheeling circuit is very important to the speed regulation circuit of the existing DC motor, and its function will not be mentioned here. However,...

Embodiment 3

[0059] Example 3: Figure 10 In order to reduce the electrical impact of the switching action, the AC freewheeling switch Sw can be connected in series with a resistor R (the resistance value is from zero ohms to thousands of ohms), and a capacitor C (usually thousands of picofarads to several microfarads) can be connected in parallel on the load side. , the circuit at this time is as Figure 12 shown.

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PUM

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Abstract

A AC follow current circuit characterizes in the connection of an end of single phase AC power U with one end of AC power on-off switch K, the other end of K is linked to an end of AC follow current switch then to connect with an end of an inductor load, while the other end of which links to the other end of the AC continous current switch then to connect to the other end of the AC power U. The induced current of circuit induced load can reduce AC power loss by the back flow of AC follow current circuit, having characters of stable voltage, low rising temperature, and small impact on power on-off switch.

Description

Technical field: [0001] The invention relates to an AC freewheeling circuit. The circuit structure includes an AC power on-off switch and an AC freewheeling switch. Background technique: [0002] The loads driven by AC power generally have inductive and capacitive characteristics. Especially inductive loads, such as motors, magnetic saturation power supplies, electric welding machines, transformers, induction heating furnaces, etc. are more common. There will be reactive power consumption when the AC power supply drives the inductive load. Width-adjustable square wave inverter power supply, pulse width modulation type sine wave inverter power supply, variable frequency speed regulation power supply, chopper power supply for speed regulation and direction change of DC motors, and there will also be cut-off induced voltage shocks and AC voltage on the inductive load side. Abnormally high and other conditions, these will impact the running equipment and power supply, and even...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/32
Inventor 郑曙明
Owner 郑曙明
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