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Step-down DC-DC converter system

A technology of DC-DC and converter, applied in the field of step-down DC-DC converter system, can solve the problem that the output voltage VOUT cannot be guaranteed, and achieve the effect of large system output voltage and stable system output voltage

Pending Publication Date: 2017-11-21
LEN TECH LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] It can be seen from formula (2) that when VIN is small, MAX_HS / TS is relatively small, and the output voltage VOUT at this time will not be guaranteed

Method used

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Embodiment 2

[0082] combine Figure 11 , to describe Embodiment 2 of the present invention in detail, but does not limit the claims of the present invention in any way.

[0083] In order to further control the first capacitor charging control circuit so that it starts working only when the MOS transistor needs to be forced to be turned on to ensure that the first capacitor is fully charged, an improvement is made on the basis of Embodiment 1, as Figure 11As shown, in the system structure shown in Embodiment 1, a voltage comparator is added, the non-inverting input terminal of the voltage comparator inputs the threshold voltage BST_THRSH, the inverting input terminal is connected to the voltage at both ends of the first capacitor, and the output terminal is charged with the first capacitor The enable signal input terminal of the control circuit is connected, and the value of the threshold voltage BST_THRSH should be at least greater than the threshold voltage of the upper MOS transistor. ...

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Abstract

The invention relates to the technical field of step-down DC-DC converters and particularly relates to a step-down DC-DC converter system, which comprises an upper MOS transistor, an upper MOS transistor driving circuit, a lower MOS transistor, a lower MOS transistor driving circuit, a first capacitor, an inductor, a switch, a power supply, a dead time control circuit, a feedback control circuit, a second capacitor, a first capacitor charging control circuit and a pulse integrating circuit, wherein the feedback control circuit is used for generating PWM control signals; when the duty cycle of the PWM control signals is close to or equal to 100%, the first capacitor charging control circuit is used for generating a switching signal to control the conduction time and the conduction frequency of the lower MOS transistor, and thus, the first capacitor is charged and enough voltage is acquired to ensure normal switching control on the upper MOS transistor by the upper MOS transistor driving circuit. The first capacitor charging control circuit is used to enable the first capacitor to have enough charging time when the duty cycle is large or equal to 100%, and control on the upper MOS transistor by the system is thus ensured.

Description

technical field [0001] The invention relates to the technical field of step-down DC-DC converters, in particular to a step-down DC-DC converter system. Background technique [0002] Among the existing step-down DC-DC converter control methods, PWM control is widely used due to its advantages of high conversion efficiency and output voltage ripple, especially in applications with restrictions on specific harmonic frequencies, generally fixed Frequency PWM control. [0003] The control principle of the step-down DC-DC converter with fixed-frequency PWM control is: to control the output voltage by chopping the input voltage and controlling the duty cycle. Such as figure 1 As shown, it is an existing commonly used step-down DC-DC converter circuit structure. The power devices of the upper and lower half bridges usually use N-type MOSFETs at the same time, and the conduction of the upper tube HS_NFET and the lower tube LS_NFET is basically complementary. State, that is, when t...

Claims

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Application Information

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IPC IPC(8): H02M3/07
CPCH02M3/07H02M3/072Y02B70/10
Inventor 陈劲泉陆玮倪川
Owner LEN TECH LTD
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