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Constant On-time Controller for SMPS with Inductor Current Slope Compensation

A technology of fixed on-time and switching power supply, which is applied in control/regulation system, output power conversion device, DC power input conversion to DC power output, etc. It can solve DC bias, high power supply accuracy requirements, and difficult to meet output Voltage high-precision technical indicators and other issues, to achieve the effect of eliminating DC bias

Inactive Publication Date: 2016-07-06
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this control method has a disadvantage that there is a DC bias problem. Because some electronic devices, such as computers, have high requirements on the accuracy of the power supply, and due to the characteristics of fixed on-time control, the output voltage must be greater than the reference voltage. This necessarily results in a DC offset between the average value of the output voltage and the reference voltage
Therefore, the traditional fixed on-time control method is difficult to meet the high-precision technical specifications of the output voltage

Method used

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  • Constant On-time Controller for SMPS with Inductor Current Slope Compensation
  • Constant On-time Controller for SMPS with Inductor Current Slope Compensation
  • Constant On-time Controller for SMPS with Inductor Current Slope Compensation

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Embodiment Construction

[0017] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is carried out on the premise of the technical solution of the present invention, and detailed implementation and specific operation process are given, but the protection scope of the present invention is not limited to the following embodiments.

[0018] Such as figure 2 As shown, a switching power supply fixed on-time controller with inductive current slope compensation, the switching power supply includes a MOSFET switch tube S, a power diode D, a filter inductor L, a filter capacitor C, and an equivalent series connection of the filter capacitor Resistance r ESR and load R, the filter inductor current is i L , the filter capacitor voltage is v c , the voltage across the equivalent series resistance is v ESR , the load current is i o ; The fixed on-time controller includes an RS flip-flop 1, a time delayer 2 and a compa...

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Abstract

The invention relates to a fixed on-time controller for a switch power supply and with an inductance and current slope compensation function. The switch power supply comprises an MOSFE switching tube and a filter inductor, the fixed on-time controller comprises an RS trigger, a time delayer and a comparator, the time delayer is connected with the RS trigger, the output end of the RS trigger is connected with the MOSFE switching tube, the input end of the RS trigger is connected with the output end of the comparator, one input end of the comparator is connected with the output end of the switch power supply, the other input end of the comparator is connected with a direct-current bias correction circuit, the direct-current bias correction circuit comprises a subtracter, an inductance and current feedback bypass and reference voltage, one end of the substrater is connected with the comparator, and the other end of the substrater is connected with the inductance and current feedback bypass and the reference voltage. Compared with the prior art, the fixed on-time controller has the advantages of precisely controlling output voltage and the like.

Description

technical field [0001] The invention relates to a switching power supply, in particular to a fixed on-time controller of the switching power supply with inductive current slope compensation. Background technique [0002] With the rapid development of mobile devices, DC-DC choppers as their power management systems, that is, switching power supplies, must meet the following technical requirements: (1) low output voltage; (2) high output voltage accuracy; (3) small size; (4) When the output load is transient, the transient overshoot of the output voltage is small. The above requirements put forward higher requirements on the steady-state and dynamic characteristics of the switching power supply, and pose new challenges to the control method of the switching power supply. Among them, the traditional fixed on-time control method is widely used in switching power supplies because it meets the basic requirements of stability, dynamic performance and simplicity. Traditional fixed ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/157
Inventor 赵晋斌刘争光屈克庆
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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