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Control circuit for DC-DC current transformer and method thereof

A technology of DC-DC and control circuits, which is applied in the direction of logic circuits using specific components, conversion equipment with intermediate conversion to AC, logic circuits using basic logic circuit components, etc., which can solve the limitations of circuit dynamic response performance and circuit structure. Complicated, slow response and other issues, to achieve the effect of improving light load efficiency, no compensation network, fast dynamic response

Active Publication Date: 2010-06-09
CHENGDU MONOLITHIC POWER SYST
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  • Claims
  • Application Information

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Problems solved by technology

However, these two control methods often require an error amplifier to amplify the difference between the sampled value of the output voltage of the main circuit and the reference voltage value, the circuit structure is complex, and a suitable compensation network is required to ensure the stability of the system; The dynamic response performance of the system will be limited by the system bandwidth, and the response speed is slow

Method used

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  • Control circuit for DC-DC current transformer and method thereof
  • Control circuit for DC-DC current transformer and method thereof
  • Control circuit for DC-DC current transformer and method thereof

Examples

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Embodiment Construction

[0027] figure 1 It is a control circuit 100 and a main circuit diagram for a DC-DC converter circuit according to the present invention. Such as figure 1 As shown, the main circuit of the DC-DC converter includes the main switching tube M 1 , Freewheeling switch tube M 2 , inductance L and capacitance C O . Among them, the main switching tube M 1 The drain of the DC-DC converter receives the input V IN , whose source is connected to the freewheeling switch M 2 The drain and one end of the inductor L; the other end of the inductor L is connected to the capacitor C O One end of the terminal, this terminal is also the output terminal V of this DC-DC converter O ; Freewheeling switch tube M 2 source and capacitor C O The other end of the ground; the main switch tube M 1 The gate and freewheeling switch M 2 The gate of is connected to the two output terminals of the driving circuit 60 of the control circuit 100 . It should be noted that the DC-DC converter is used here...

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Abstract

The invention provides a control circuit for a DC-DC current transformer and a control method thereof; the control circuit comprises a self-adaption constant time breakover control circuit, a voltage feedback circuit, a minimum turn-off time control circuit, a logic circuit, a reverse current comparison circuit and a driving circuit; the control circuit has rapid dynamic response and self-adaption constant breakover time of a main circuit switching tube, and the circuit is simple without compensating network.

Description

technical field [0001] The present invention relates to a converter circuit, in particular, the present invention relates to an adaptive constant on-time DC-DC converter circuit. Background technique [0002] DC-DC converter circuits usually have multiple control methods. Among them, voltage mode control and current mode control are the two most common control methods. However, these two control methods often require an error amplifier to amplify the difference between the sampled value of the output voltage of the main circuit and the reference voltage value, the circuit structure is complex, and a suitable compensation network is required to ensure the stability of the system; The dynamic response performance of the system will be limited by the system bandwidth, and the response speed is slow. [0003] Therefore, it is necessary to propose a control circuit and method for a DC-DC converter with fast dynamic response, simple and no compensation network. Contents of the...

Claims

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Application Information

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IPC IPC(8): H02M3/22H03K4/08H03K19/173
CPCH02M3/158
Inventor 欧阳茜
Owner CHENGDU MONOLITHIC POWER SYST
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