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Control circuit, electronic device, and method for controlling power supply

A technology for controlling circuits and power supplies, applied in the direction of high-efficiency power electronic conversion, control/regulation systems, electrical components, etc., can solve problems such as reduction

Active Publication Date: 2015-05-20
CYPRESS SEMICON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This reduces the overshoot ΔVoa of the output voltage Voa

Method used

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  • Control circuit, electronic device, and method for controlling power supply
  • Control circuit, electronic device, and method for controlling power supply
  • Control circuit, electronic device, and method for controlling power supply

Examples

Experimental program
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no. 1 example

[0042] The first embodiment will refer to Figure 1 to Figure 5 be described.

[0043] Such as figure 1 As shown, the step-down DC-DC converter 1 includes a conversion unit 2 and a control circuit 3 . The conversion unit 2 receives an input voltage Vi and generates an output voltage Vo lower than the input voltage Vi. The control circuit 3 controls the conversion unit 2 .

[0044] The internal configuration of the transformation unit 2 will now be described.

[0045]The main transistor T1 and the synchronous transistor T2 are connected in series between an input terminal Pi supplied with an input voltage Vi having a voltage lower than the input voltage Vi and a low-potential power supply line (ground in this example). potential. The main transistor T1 and the synchronous transistor T2 are N-channel metal oxide semiconductor (MOS) transistors.

[0046] The transistor T1 has a first terminal (drain) connected to the input terminal Pi and a second terminal (source) connect...

no. 2 example

[0094] A second embodiment of the invention will refer to Figure 6 to Figure 12 be described. The step-down DC-DC converter 1a of the second embodiment differs from the converter of the first embodiment in that it operates in a pulse frequency modulation (PFM) mode (or pulse skipping (skip) mode) in a steady state. operation, and deactivates synchronous transistor T2 when reverse flow of coil current IL is detected in PFM mode. Differences from the first embodiment will be described below. those with Figure 1 to Figure 5 Elements that are the same as corresponding elements shown in will be given similar or identical reference numerals. These elements will not be described in detail.

[0095] Such as Image 6 As shown, both terminals of the synchronous transistor T2 are connected to the reverse current detection comparator 15 . The inverting input terminal of the comparator 15 is connected to the drain of the transistor T2. The non-inverting input terminal of the compa...

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PUM

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Abstract

A control circuit arranged in a power supply including first and second switches to control an output voltage of the power supply. The control circuit includes a first control circuit that switches the first and second switches in a complementary manner in accordance with a comparison result of a first reference voltage and a feedback voltage corresponding to the output voltage of the power supply. A first comparison circuit compares the output voltage or feedback voltage with a second reference value. A second comparison circuit compares a coupling point current flowing through a coupling point between the first and second switches with a third reference value. A second control circuit disables complementary switching of the first and second switches in accordance with an output signal from the first comparison circuit and enables the complementary switching in accordance with an output signal of the second comparison circuit.

Description

technical field [0001] Embodiments of the present invention relate to a control circuit, electronic equipment and method for controlling a power supply. Background technique [0002] Step-down switching DC-DC converters (DC-DC converters) are used to supply power voltages to various electronic devices. Such DC-DC converters generally include rectifiers that reduce rectification losses by performing synchronous rectification. A switching element such as a metal oxide semiconductor (MOS) transistor may be used as the rectifier. [0003] Figure 22 A conventional step-down DC-DC converter 4 with synchronous rectification is shown. The step-down DC-DC converter 4 includes a main transistor T11, a synchronous transistor T12, a coil L11, a smoothing capacitor C11, and a control circuit 5 for controlling the activation and activation of the transistors T11 and T12 in a substantially complementary manner. Inactivation. [0004] The step-down DC-DC converter 4 alternately activat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/155
CPCH02M3/1588H02M3/1566Y02B70/10
Inventor 栉田幸一郎二村一好熊谷正雄
Owner CYPRESS SEMICON CORP