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Zero cross detection circuit for synchronous buck converter

A technology of zero-crossing detection circuit and synchronous step-down, which is applied in the direction of instruments, measuring devices, and measuring electrical variables, etc. It can solve the problems that the detection deviation cannot be accurately offset, and achieve the effects of easy implementation, simple circuit structure, and improved accuracy

Active Publication Date: 2017-09-05
拓尔微电子股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional zero-crossing detection does not compensate or introduces a fixed offset voltage Vos in the zero-crossing comparator to compensate, which cannot accurately offset the detection deviation caused by the delay of the zero-crossing comparator A

Method used

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  • Zero cross detection circuit for synchronous buck converter
  • Zero cross detection circuit for synchronous buck converter
  • Zero cross detection circuit for synchronous buck converter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] like image 3 As shown, a zero-crossing detection circuit for a synchronous step-down converter includes a zero-crossing comparator A and a multiplier, and the inverting input terminal of the zero-crossing comparator A is connected to the synchronous Tube M L The non-inverting input terminal of the zero-crossing comparator A is connected to the output terminal Vos of the multiplier, and the output terminal of the zero-crossing comparator A is connected to the input terminal of the driving circuit of the synchronous step-down converter, and the output terminal of the multiplier The first input terminal is connected to the voltage output terminal VOUT of the synchronous step-down converter, and the second input terminal of the multiplier is connected to a positive temperature coefficient current source Iptat.

[0027] In this specific embodiment, the multiplier includes PNP transistors M2-M5, NMOS transistors M0-M1 and resistors R0-R1, the emitter of the PNP transistor M...

Embodiment 2

[0032] The difference between this embodiment and Embodiment 1 is that the specific circuit structure of the multiplier is different, specifically, such as Figure 4 As shown, the multiplier includes NPN transistor M2, NPN transistor M3, PNP transistor M4, NPN transistor M5, NMOS transistor M0, PMOS transistor M1 and resistors R0-R1, the emitter of the NPN transistor M2 is grounded, and the NPN transistor M2 The collector of the triode M2 ​​and the gate of the PMOS transistor M1 are connected to the output end of the first current mirror 1, the source series resistor R0 of the NMOS transistor M0 is grounded, and the gate of the NMOS transistor M0 is connected to the synchronous step-down converter. The voltage output terminal VOUT of the NMOS transistor M0 is connected to the input terminal of the first current mirror 1, the power supply terminal of the first current mirror 1 is connected to the power supply VCC, the base of the NPN transistor M2 and the emitter of the NPN tran...

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Abstract

The invention relates to the field of buck converters, in particular to a zero cross detection circuit for a synchronous buck converter. The zero cross detection circuit for the synchronous buck converter comprises a zero cross comparator and a binary multiplier; two input ends of the zero cross comparator are connected with an output end of the binary multiplier and a drain electrode of a synchronous tube of the synchronous buck converter respectively, and an output end of the zero cross comparator is connected with an input end of a driving circuit of the synchronous buck converter; a first input end of the binary multiplier is connected with a voltage output end of the synchronous buck converter, and a second input end of the binary multiplier is connected with a positive temperature coefficient current source. According to the zero cross detection circuit for the synchronous buck converter, deviation of zero cross detection caused by the temperature of the synchronous buck converter and the set output voltage is fully considered, and precision of the zero cross detection is improved.

Description

technical field [0001] The invention belongs to the field of step-down converters, in particular to a zero-crossing detection circuit for synchronous step-down converters. Background technique [0002] In recent years, with the development of China's economy and the rise of the electronics industry, the rapid popularization of consumer electronics products, especially portable electronic devices, has made power supply technology tend to be characterized by high power, high energy efficiency, and high integration. DC converters are widely used in power management systems due to their high efficiency. [0003] The synchronous step-down converter in the DC converter has two working modes: connected conduction mode (CCM) and discontinuous conduction mode (DCM). In the discontinuous conduction mode, a zero-crossing detection circuit is required to detect whether the inductor current is zero-crossing. When the inductor current is detected to be zero, the synchronous tube is turne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/175
CPCG01R19/175Y02B70/10
Inventor 许超群易俊
Owner 拓尔微电子股份有限公司
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