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Power Factor Improvement Circuit

A power factor improvement and circuit technology, which is applied in the field of power factor improvement circuits, can solve problems such as inability to improve power factor converters, and achieve the effect of improving efficiency

Active Publication Date: 2019-03-19
SANKEN ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it cannot be controlled with a power factor improving converter alone

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] figure 1 It is a circuit diagram of the power factor improvement circuit of Embodiment 1 of this invention. exist figure 1 In the power factor improvement circuit of Embodiment 1 shown, the filter 2 removes noise and the like included in the AC voltage from the AC power supply 1 . The full-wave rectification circuit DB rectifies the AC voltage from the filter 2 and outputs it to both ends of the capacitor C1.

[0025] A series circuit of a reactor L, a switching element Q1, and a current detection resistor R1 is connected to both ends of the capacitor C1. The switching element Q1 is formed of a MOSFET, and a series circuit of a diode D1 and a capacitor C2 is connected between the drain and the source of the switching element Q1.

[0026] A series circuit of a resistor R2 and a resistor R3 is connected to both ends of the capacitor C2. The reactor L is composed of a main winding La and an auxiliary winding Lb that are electromagnetically coupled to each other. One en...

Embodiment 2

[0034] The PFC control unit 10 of Embodiment 2 performs the following steps when the load is light Figure 4 action shown. That is, in the case of Figure 4 When the input voltage Vin shown in (a) is low, the PFC control unit 10 is Figure 4 As shown in (b), the switching element Q1 is controlled four times, and when the input voltage Vin is high, the PFC control unit 10 is as follows: Figure 4 As shown in (c), one jump control is performed on the switching element Q1.

Embodiment 3

[0036] Figure 5 It is a detailed circuit diagram of the PFC control part in the heavy load of the power factor improvement circuit of Example 3 of this invention. The power factor improvement circuit of Embodiment 3 is image 3 A specific example of the PFC control unit 10 is shown.

[0037] Figure 5 The PFC control section 10a shown has: current sources I1, I2, capacitors C11, C12, flip-flop circuits FF1, FF2, comparators CP1, CP2, transistors Q11, Q12, "AND" circuits AND 1, AND 2, ZCD( Zero-cross current detector) 12, delay circuit 13, one-shot circuit 14, counter 15, jump circuit 16, falling edge one-shot circuit 17, operational amplifier OTA1, and reference voltage Vr.

[0038]The non-inverting terminal of the operational amplifier OTA1 is connected to the reference voltage Vr, and the inverting terminal is connected to the FB terminal. The operational amplifier OTA1 and the reference voltage Vr form an error amplifier of the output voltage. In addition, the capacito...

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PUM

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Abstract

The present invention provides a power factor improvement circuit capable of independent control and improved efficiency. The power factor improvement circuit rectifies the AC voltage and converts it into a DC voltage, switches the DC voltage through a series circuit of a reactor and a switching element, and rectifies and smoothes the regenerative energy of the reactor to obtain a specified output voltage. The circuit has: a bottom conduction setting part, which sets the conduction timing according to the bottom when the voltage at both ends of the switching element is attenuated and vibrates; a conduction time setting part, which sets the conduction of the switching element according to the output voltage time; and a bottom jump control section which, when the ratio of the on-time set by the on-time setting section to the regenerative period of the current flowing through the reactor when the switching element is off, makes the switching element Quasi-resonance is performed, and when the ratio exceeds a predetermined value, the switching element is turned on when the first bottom jumps once and reaches the next bottom.

Description

technical field [0001] The invention relates to a power factor improving circuit, in particular to the output voltage control of the power factor improving circuit at light load. Background technique [0002] For example, Patent Document 1 describes a switching power supply device comprising a combination of a power factor improving converter and a DC / DC converter. This switching power supply device includes a load state detection unit that detects a state of a load in a DC / DC converter. When the load state detecting unit detects that the load state of the DC / DC converter is a light load, the DC / DC converting unit outputs a light load detection signal to the power factor improving converter, and the power factor improving converter lowers the frequency. Thereby, the efficiency at the time of light load can be improved. [0003] [Patent Document 1]: Japanese Patent Laid-Open No. 2014-131455 [0004] However, in existing power factor improving circuits, a combination of a p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/42
CPCH02M1/4258H02M1/4225Y02B70/10Y02P80/10H02M1/0032H02M1/0058
Inventor 大竹修寺泽阳一古越隆一
Owner SANKEN ELECTRIC CO LTD