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electrical conversion

A technology of electrical conversion and capacitors, applied in the field of electrical conversion, which can solve the problems of complexity and cost, difficulty in supplying capacitors, and low power factor

Active Publication Date: 2019-10-08
PULSIV LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is difficult to supply such capacitors in some applications
[0003] The power factor of structures of this type outlined earlier is therefore generally relatively low, for example in the interval 0.3 to 0.6
Furthermore, if used in medium to high voltage applications, especially in applications where the associated loads have to be switched, the generation of harmonics would necessitate the provision of additional circuitry to suppress such harmonics, which would impose Additional complexity and cost

Method used

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Embodiment Construction

[0014] first reference figure 1 , shows an electrical conversion device 10 comprising a bridge rectifier 12 having an input side 14 connected to an AC power source 16 and an output side 18 . A switched capacitor line 20 is connected across the output side 18 .

[0015] The switched capacitor line 20 includes a capacitor 22 , a charging branch 24 (by which charging of the capacitor 22 can occur) and a switched discharging branch 26 (by which the capacitor can be discharged to supply a load 28 ).

[0016] The charging branch 24 includes a transistor 30 whose collector is connected to the high output line or side 18 a through a resistor 32 and whose emitter is connected to the capacitor 22 through a diode 34 . The base of transistor 30 is held at a level controlled by a Zener diode 36 and a resistor 38 connected between high output line 18a and ground line 18b.

[0017] Switched discharge branch 26 includes a suitable switch 40 and diode 42 . The switch 40 may comprise, for ex...

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Abstract

Devices and methods for use in electrical conversion are described. The device comprises a bridge rectifier (12) having an input side (14) and an output side (18), and a switched capacitor line (20) connected across the output side (18) of said rectifier (12), wherein the switch The capacitor line (20) includes a capacitor (22), a charge branch (24) and a switch discharge branch (26), and wherein the charge branch (24) integrates a transistor (30), which is controlled to switch on the transistor (30) Maintains a substantially constant charge current during turn-on.

Description

technical field [0001] The present invention relates to methods and apparatus for use in the conversion or rectification of AC power to provide a DC output. The arrangement may form part of a power supply, eg for an electrical or electronic device. Background technique [0002] The use of a bridge rectifier for rectifying an AC signal to produce a varying DC output is known. One disadvantage associated with using a bridge rectifier is that the DC output varies wildly, essentially between the peak input AC magnitude and zero. A common technique to reduce output signal variation is to provide a smoothing capacitor connected across the output of the bridge rectifier, which charges and discharges in use to smooth the output signal. While providing such a smoothing capacitor works satisfactorily in many applications, there can still be significant output variation or ripple. Furthermore, capacitors generally have to be relatively large in terms of their capacitance and their s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/42
CPCH02M1/4208H02M1/4266H02M1/12H02M1/15H02M7/06Y02B70/10H02M1/4283
Inventor M·艾哈迈德
Owner PULSIV LTD