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Power supply charging circuit of synchronous step-down power converter

A power converter and charging circuit technology, applied in the direction of adjusting electric variables, converting DC power input to DC power output, instruments, etc., can solve the problems of limited charging time of power supply VBOOST and difficulties in synchronous step-down power converters, etc. Achieve the effects of increasing charging time, large duty cycle, and fast recovery speed

Active Publication Date: 2017-07-25
SHANGHAI BEILING
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the limited time for the power supply charging circuit in the prior art to charge the power supply VBOOST of the upper tube drive circuit, resulting in the realization of a synchronous step-down power converter with a large duty cycle and a large load current. There are difficult defects, and a new power charging circuit is provided, which can realize a synchronous step-down power converter with a large duty cycle and a large load current

Method used

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  • Power supply charging circuit of synchronous step-down power converter
  • Power supply charging circuit of synchronous step-down power converter
  • Power supply charging circuit of synchronous step-down power converter

Examples

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Embodiment 1

[0024] like image 3 As shown, this embodiment provides a power supply charging circuit for a synchronous step-down power converter, the synchronous step-down power converter includes a power supply VBOOST of an upper tube drive circuit, and the power charging circuit includes an error amplifier and an adjustment Tube Mpass, the error amplifier is used to generate an error voltage to adjust the adjustment tube so that the value of the power supply VDD-R is close to the reference The value of the voltage VREF is used to charge the power supply VBOOST by the power supply VDD-R. In addition, the power supply charging circuit also includes a dynamic bias module (Dynamic Bias).

[0025] The error amplifier is also used to generate a first current based on the power supply VDD-R, generate a second current based on the reference voltage VREF, and transmit the first current and the second current to the dynamic bias module;

[0026] The dynamic bias module is used for dynamically amp...

Embodiment 2

[0032] image 3 The circuit shown is the same as Figure 4 The combination of the shown circuit further improves the ability of the power supply VDD-R to charge the power supply VBOOST of the upper tube drive circuit.

[0033] Figure 4A VDD-R control circuit with push-pull capability is shown, which includes two first and second current amplifiers GML and GMH whose bias currents are controlled, a second pass transistor Mpass that flows through a large current, and 3 current mirrors (respectively a first current mirror, a second current mirror and a third current mirror). Wherein, the first current mirror, the second current mirror and the third current mirror are transistors M1 and M2, transistors M3 and M4, and transistors M5 and M6, respectively.

[0034] When the down tube is turned on and the power supply VDD-R is lower than the reference voltage VREF, the first current amplifier is used to receive a control signal to enable, generate a first current much larger than t...

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Abstract

The invention provides a power supply charging circuit of a synchronous step-down type power converter. The power supply charging circuit includes an error amplifier, a compensating pipe and a dynamic biasing module. The power converter includes a power supply VBOOST of a top tube driving circuit. The error amplifier is intended for generating an error voltage adjustment so as to generate a power supply which is close to the reference voltage VREF and charge the VBOOST when the input power supply VDD-R of a down tube driving circuit is lower than or higher than a reference voltage VRER. The error amplifier is also used for generating a first current based on the power supply VDD-R, and generating a second current based on the reference voltage VREF, and transmitting the first current and the second current to the dynamic biasing module. The dynamic biasing module is intended for dynamically amplifying a biasing current of the error amplifier based on the current difference between the received second current and the first current, and increasing the capability of charging the power supply VBOOST by the power supply VDD-R.

Description

technical field [0001] The invention relates to a synchronous step-down power converter with a large duty cycle and a large load current, in particular to a power charging circuit of the synchronous step-down power converter. Background technique [0002] figure 1 It shows the system structure of the synchronous step-down power converter based on the bootstrap scheme, where the bootstrap is to generate a voltage higher than the input voltage VIN to drive the upper transistor. When the upper tube is turned on, the power supply VBOOST of the upper tube drive circuit is bootstrapped to a voltage higher than the input voltage VIN to drive the upper tube; when the upper tube is turned off and the lower tube is turned on, usually figure 2 The circuit shown charges the power supply VBOOST of the upper tube drive circuit. figure 2 The circuit shown includes an error amplifier Error Amplifier and an adjustment transistor Mpass that flows through a large current. The error amplif...

Claims

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Application Information

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IPC IPC(8): H02M3/155
Inventor 谢雪松孙彪常祥岭赵海亮陶园林
Owner SHANGHAI BEILING
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