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Rectification and filtering method and circuit

A rectifier filter circuit, rectifier filter technology, applied in electrical components, irreversible AC power input into DC power output, output power conversion device and other directions, can solve the problem of insufficient use of filter capacitors, small cost and space occupation and other problems, to achieve the effect of reducing weight, saving area and improving utilization rate

Inactive Publication Date: 2015-06-03
MORNSUN GUANGZHOU SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0032] In view of this, the purpose of the present invention is to solve the problems of insufficient utilization of filter capacitors, high cost, and large space occupation in existing rectification and filtering circuits under a wide input voltage range, and to provide a rectification and filtering method that can provide a wide range of input voltages. Provide different rectification methods in different voltage ranges to reduce the requirements for filter capacitors, improve the utilization rate of filter capacitor capacitance and withstand voltage, and achieve relatively low cost and small footprint

Method used

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  • Rectification and filtering method and circuit
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  • Rectification and filtering method and circuit

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no. 1 example

[0081] Figure 10 Shows the circuit schematic diagram of the rectification and filtering circuit of the first embodiment of the present invention, a rectification and filtering circuit, including an integrated or connected by discrete diodes (D1, D2, D3, D4 in the figure) to form a known bridge Rectifier 100, the positive output end of the bridge rectifier is the output positive terminal of the rectification filter circuit, the negative output end of the bridge rectifier is the output negative terminal of the rectification filter circuit; the rectification filter circuit includes a first switch S1 and capacitors C1, Capacitor C2, the two ends of capacitor C1 are respectively connected to the output positive terminal of bridge rectifier and the positive pole of capacitor C2, and the two ends of capacitor C2 are respectively connected to the negative pole of capacitor C1 and the output negative terminal of bridge rectifier; one end of switch S1 is connected to the AC Either end ...

no. 2 example

[0098] One disadvantage of the above-mentioned first embodiment is that the circuit cannot automatically select a suitable rectification method according to the change of the input voltage, which limits its scope of application to a certain extent. The second embodiment is implemented to improve this deficiency, and an appropriate rectification method can be selected according to the change of the input voltage.

[0099] Figure 12 It is the schematic block diagram of the rectifying and filtering circuit of the second embodiment of the present invention, and is also the schematic block diagram of the third, fourth, and fifth embodiments; as a further improvement of the above technical solution, the difference between this embodiment and the first embodiment is that , the rectification filter circuit also includes a voltage detection control circuit 102, when it is detected that the input AC voltage is lower than the preset value, the first switch S1 is controlled to be closed;...

no. 3 example

[0115] Figure 14 A schematic circuit diagram of the rectification and filtering circuit of the third embodiment of the present invention is shown. This embodiment is an improvement made on the basis of the second embodiment, and the only difference from the second embodiment lies in the structure of the voltage detection control circuit 102 . In this embodiment, the voltage detection control circuit 102 is still in the first working mode, which is to detect the voltage peak value of the AC input voltage. The voltage detection control circuit 102 includes: resistors R1, R2, R3, R4, capacitor C3, diode D5, Zener diodes D6, D7, NPN transistors T1, T2. The connection relationship of the voltage detection control circuit 102 is as follows: the anode of the diode D5 is used as the voltage detection input positive 109, the cathode of the diode D5 is connected to one end of the resistor R1, and at the same time connected to one end of the capacitor C3, and the other end of the resis...

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Abstract

The invention discloses a rectification and filtering circuit, which comprises a bridge rectification part, a first switch, a first capacitor, a second capacitor and a voltage detection control circuit, wherein the first and second capacitors are connected in series; the voltage detection control circuit is used for detecting input voltage and controlling the first switch; the positive end of the first capacitor and the negative end of the second capacitor are positive and negative output terminals of the rectification and filtering circuit respectively; one end of an on / off contact of the first switch is connected with the series connection point of the first and second capacitors, and the other end of the on / off contact is connected with alternating current input end, and is also connected with the positive input end of the voltage detection control circuit; the negative end of the voltage detection control circuit is connected with the negative output terminal, the first output end of the voltage detection control circuit is connected to the control end of the first switch, and the power supply end of the voltage detection control circuit is connected with the anode of an auxiliary power supply; the voltage detection control circuit has a preset value, and is used for controlling the first switch to be turned on when input voltage is detected to be smaller than the preset value, and controlling the first switch to be turned off when the input voltage is detected to be more than the preset value. According to the rectification and filtering circuit, the filter capacity of wide-range input voltage in a low-voltage interval can be greatly reduced, the rectification and filtering circuit is low in implementation cost, and small space is occupied.

Description

technical field [0001] The invention relates to a low-power AC-DC switching power supply, in particular to a rectifying and filtering method and circuit for the low-power and wide-voltage input AC-DC switching power supply. Background technique [0002] Industrial and civil power supply generally adopt AC power supply, and most AC power equipment in industry, such as motors, use three-phase AC power. In daily life, single-phase electricity is mostly used, also known as lighting electricity. figure 1 What is shown is the domestic single-phase alternating current that changes according to the sinusoidal law over time, called alternating sinusoidal voltage, and the time required for one change is called the cycle of alternating voltage, represented by T. The 220V in the industry refers to rms, with a peak value of Times the effective value, that is: [0003] 220 V × 2 = 311.1 V ………………...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/14
CPCH02M1/14H02M7/06
Inventor 陈宁
Owner MORNSUN GUANGZHOU SCI & TECH