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Constant-current control circuit, switching regulator, integrated circuit and constant-current control method

A technology of constant current control circuit and switching regulator, which is applied in the direction of control/regulation system, regulation of electric variables, conversion of DC power input to DC power output, etc. Multiple ports etc.

Inactive Publication Date: 2014-06-04
NANJING SILERGY SEMICON TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] but, figure 1 The switching regulator shown needs to set sampling resistors and RC filters in order to sample the output current, which makes the external circuit more complex and has a larger number of components, and at the same time, the input ports of the control circuit are also more

Method used

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  • Constant-current control circuit, switching regulator, integrated circuit and constant-current control method
  • Constant-current control circuit, switching regulator, integrated circuit and constant-current control method
  • Constant-current control circuit, switching regulator, integrated circuit and constant-current control method

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Embodiment Construction

[0083] The present invention is described below based on examples, but the present invention is not limited to these examples. In the following detailed description of the invention, some specific details are set forth in detail. The present invention can be fully understood by those skilled in the art without the description of these detailed parts. In order not to obscure the essence of the present invention, well-known methods, procedures, procedures, components and circuits have not been described in detail.

[0084] Additionally, those of ordinary skill in the art will appreciate that the drawings provided herein are for illustrative purposes and are not necessarily drawn to scale.

[0085] Meanwhile, it should be understood that in the following description, "circuit" refers to a conductive loop formed by at least one element or sub-circuit through electrical connection or electromagnetic connection. When an element or circuit is said to be "connected to" another eleme...

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Abstract

The invention discloses a constant-current control circuit, a switching regulator, an integrated circuit and a constant-current control method. The constant-current control circuit is applied to the switching regulator. The switching regulator comprises an upper power switch and a lower power switch. The constant-current control circuit comprises a switching current sampling circuit, a compensating signal generation circuit and a switch control signal generation circuit, wherein the switching current sampling circuit is used for sampling currents flowing through the upper power switch and / or the lower power switch and outputting switching current sampling signals; the compensating signal generation circuit is used for generating compensating signals according to the duty ratio of the switching current sampling signals to switch control signals or multiple switching current sampling signals; the switch control signal generation circuit is used for generating the switch control signals according to the compensating signals. By means of the scheme, the complexity of an external circuit of the switching regulator can be lowered, the number of devices can be reduced, and the number of input ports of the control circuit is reduced at the same time.

Description

technical field [0001] The present invention relates to power electronics technology, in particular to a constant current control circuit, a switching regulator, an integrated circuit and a constant current control method, in particular to a constant current control circuit, a switching regulator, an integrated circuit and a constant current control method for a rechargeable battery charger. flow control method. Background technique [0002] A constant current switching regulator can output a constant current, which can be applied to battery chargers and other occasions. [0003] In order to realize the constant current control for the switching regulator, it is necessary to sample the output current. figure 1 It is a schematic circuit diagram of an existing constant current switching regulator. Such as figure 1 As shown, the switching regulator 10 includes an upper power switch S1, a lower power switch S2, an energy storage inductor L B and power output capacitor C O ....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/156
Inventor 程帅
Owner NANJING SILERGY SEMICON TECH CO LTD
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