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Synchronous boost DCDC circuit with automatic clamping output and protection method thereof

A technology of synchronous boost and output voltage, applied in the output power conversion device, the conversion of DC power input to DC power output, electrical components, etc. The effect of sacrificing efficiency

Pending Publication Date: 2022-02-11
JIAXING HEROIC ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But the large capacitance added to Pout will increase the cost and the volume of the system solution

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  • Synchronous boost DCDC circuit with automatic clamping output and protection method thereof
  • Synchronous boost DCDC circuit with automatic clamping output and protection method thereof

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Embodiment Construction

[0031] The following description serves to disclose the present invention to enable those skilled in the art to carry out the present invention. The preferred embodiments described below are only examples, and those skilled in the art can devise other obvious variations. The basic principles of the present invention defined in the following description can be applied to other embodiments, variations, improvements, equivalents and other technical solutions without departing from the spirit and scope of the present invention.

[0032] In the preferred embodiment of the present invention, those skilled in the art should note that the inductive loads, portable devices, etc. involved in the present invention can be regarded as prior art.

[0033] preferred embodiment.

[0034] The present invention discloses a synchronous step-up DCDC circuit with automatic clamping output, which is used for real-time detection of the output voltage of the output terminal and automatic clamping prot...

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Abstract

The invention discloses a synchronous boost DCDC circuit with automatic clamping output and a protection method thereof. The synchronous boost DCDC circuit with automatic clamping output is used for detecting the output voltage of an output end in real time and carrying out automatic clamping protection on the output voltage, and comprises a first voltage comparator, a second voltage comparator, a first double-input AND gate, a low-side switching tube, an inverter, a double-input OR gate, a second double-input AND gate, a high-side rectifying tube, a resistor R12, a resistor R13 and a resistor R14. According to the synchronous boost DCDC circuit with the automatic clamping output and the protection method thereof disclosed by the invention, the defect that when a synchronous boost DCDC chip is used for supplying power to an inductive load on current equipment, the voltage of the output end Pout of the synchronous boost DCDC is raised, so that the synchronous boost DCDC and other circuits supplied with power by the output end Pout are damaged is overcome.

Description

technical field [0001] The invention belongs to the technical field of analog integrated circuits, and in particular relates to a synchronous boost DCDC circuit with automatic clamp output and a synchronous boost DCDC protection method with automatic clamp output. Background technique [0002] In recent years, portable devices have been used more and more widely, and most of these devices are powered by lithium batteries. The maximum voltage of a single-cell lithium battery is 4.2V. In order to meet the needs of system power supply, most portable devices will use a DCDC boost chip to increase the system power supply voltage, such as boosting to 5~7V. The load of DCDC output Pout is various. If the load is inductive, such as a motor or a speaker, the system will encounter the current of the inductive load flowing to the output terminal Pout of the DCDC when the system is working, resulting in a high Pout voltage, Pout If the voltage is too high, it will damage the DCDC and o...

Claims

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Application Information

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IPC IPC(8): H02M3/156H02M1/34
CPCH02M3/156H02M1/34
Inventor 沈林峰殷明卢伟超史佳卉
Owner JIAXING HEROIC ELECTRONICS TECH