Unlock instant, AI-driven research and patent intelligence for your innovation.

Power frequency synchronization follow current control device of AC chopper circuit

A control device, the technology of AC chopper, applied in the output power conversion device, the AC power input is converted into the AC power output, the electrical components and other directions, which can solve the effect of the AC chopper freewheeling effect, the increase of the AC chopper frequency, the continuous The problem of untimely flow, etc., achieves the effect of simple structure, improved reliability and good effect.

Inactive Publication Date: 2015-03-25
韩亚兰
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

figure 2 and image 3 t0 is the start time of each chopping current, t1 is the cut-off time of each chopping current, t2 is the start time of each freewheeling current, and Δt is the delay between the start time of the freewheeling current and the cutoff time of the chopping current Time, the start time of the freewheeling current lags behind the cut-off time of the chopping current, which causes the untimely freewheeling, which affects the freewheeling effect of the AC chopping, and because it is necessary to set the "dead time" Δt, the AC chopping The further increase in frequency is limited by the
When performing three-phase AC chopping, it is also necessary to control the phase of the control signal of the chopping switch and the freewheeling switch more precisely and complexly

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Power frequency synchronization follow current control device of AC chopper circuit
  • Power frequency synchronization follow current control device of AC chopper circuit
  • Power frequency synchronization follow current control device of AC chopper circuit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] See Figure 4 , Figure 5 and Figure 6 As shown, this embodiment is composed of chopper switch IGBT components, freewheel switches T1 and T2, power frequency synchronous freewheel control device Q, filter inductor L, filter capacitor C and AC load RL, and the input end of the chopper switch IGBT component Connected to the power supply phase line, the output end of the chopper switch IGBT component is connected to one end of the filter inductor L, and the other end of the inductor L is connected to one end of the filter capacitor and one end of the AC load. The output end of the chopper switch IGBT component is also connected to the collector of the freewheeling switch T2, the emitter of T2 is connected to the emitter of T1, the collector of T1 is connected to the neutral line of the power supply, and the neutral line of the power supply is also connected to the filter capacitor The other end is connected to the other end of the load RL. The state when the power phas...

Embodiment 2

[0034] See Figure 4 , Figure 5 As shown in Figure 7, this embodiment consists of a chopper switch IGBT assembly, a freewheel switch T1, a diode D1, a freewheel switch T2, a diode D2, a power frequency synchronous freewheel control device Q, a filter inductor L, a filter capacitor C and AC load RL constitutes. The input end of the chopper switch IGBT component is connected to the power phase line, the output end of the chopper switch IGBT component is connected to one end of the filter inductor L, and the other end of the inductance L is connected to one end of the filter capacitor and one end of the AC load. The output terminal of the chopper switch IGBT component is also connected to the positive pole of D2 and the negative pole of D1, the positive pole of D1 is connected to the emitter of the freewheeling switch T1, the negative pole of D2 is connected to the collector of the freewheeling switch T2, and the neutral line of the power supply Connect with the emitter of T1,...

Embodiment 3

[0037] See Figure 4 , Figure 5 and Figure 8 As shown, Embodiment 3 is similar to Embodiment 1, the difference is that this embodiment uses three AC chopper circuits of the same power frequency synchronous freewheeling control device Q as Embodiment 1 on the three-phase line, Form the main circuit structure of the power frequency synchronous freewheeling control three-phase AC chopper, and the working principle will not be described in detail.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a power frequency synchronization follow current control device of an AC chopper circuit. The AC chopper circuit comprises a chopping switch IGBT component, a power frequency synchronization follow current control device body Q, a follow current switch component, a filter inductor L, a filter capacitor C and a load RL. Follow current control signal voltage output by the power frequency synchronization follow current control device body Q is only identical with alternating current input in the chopping switch IGBT component in power frequency. Self-inductance current of the load RL and self-inductance current of the filter inductor L are obtained through a closed circuit formed by a follow current switch T1 switched on in each positive semicircle and a follow current switch T2 switched on in each negative semicircle after each switching off of the chopping switch IGBT component. By means of the power frequency synchronization follow current control device, AC chopping does not need a dead time, in-time follow current without a time difference is achieved between a follow current start time and a chopping shutoff time.

Description

technical field [0001] The invention relates to the technical field of AC chopping and voltage regulation of mains power, and relates to a power frequency synchronous freewheeling control device for an AC chopping circuit. Background technique [0002] AC chopping is the best technical form to realize the voltage regulation and transformation of mains electricity, and its circuit structure diagram is shown in figure 1 , including a chopping switch assembly 1, a chopping and freewheeling control device 2, a freewheeling switch assembly 3, a filter inductor 4, a filter capacitor 5, and a load 6. Due to the effect of inductive reactance, the induced current that will be formed when the filter inductor 4 and the load 6 are turned off after each turn-on of the chopper switch component 1 needs to provide a path for the induced current to continue to flow, that is, the chopper switch component 1 The subsequent circuit is connected in parallel with the freewheeling switch assembly ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H02M5/293
CPCH02M5/293H02M1/0003
Inventor 韩亚兰
Owner 韩亚兰