Switching voltage stabilization circuit and voltage feedback circuit as well as voltage feedback method of voltage feedback circuit

A switching voltage regulation and voltage feedback technology, applied in electrical components, regulating electrical variables, instruments, etc., can solve the problems affecting the normal operation of the load, output voltage changes, large line losses and voltage drops, etc.

Active Publication Date: 2012-12-19
CHENGDU MONOLITHIC POWER SYST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the output wire is long or the wire diameter is small, the output wire between the switching power supply and the load has a large line resistance (such as in the charger solution), and the output current will generate a large voltage when it flows through the output

Method used

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  • Switching voltage stabilization circuit and voltage feedback circuit as well as voltage feedback method of voltage feedback circuit
  • Switching voltage stabilization circuit and voltage feedback circuit as well as voltage feedback method of voltage feedback circuit
  • Switching voltage stabilization circuit and voltage feedback circuit as well as voltage feedback method of voltage feedback circuit

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Embodiment Construction

[0018] Specific embodiments of the present invention will be described in detail below, and it should be noted that the embodiments described here are only for illustration, not for limiting the present invention. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one of ordinary skill in the art that these specific details need not be employed to practice the present invention. In other instances, well-known circuits, materials or methods have not been described in detail in order to avoid obscuring the present invention.

[0019] Throughout this specification, reference to "one embodiment," "an embodiment," "an example," or "example" means that a particular feature, structure, or characteristic described in connection with the embodiment or example is included in the present invention. In at least one embodiment. Thus, appearances of the phrases "in on...

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Abstract

The invention discloses a switching voltage stabilization circuit and a voltage feedback circuit as well as a voltage feedback method of the voltage feedback circuit. The switching voltage stabilization circuit comprises a switching circuit for converting input voltage into output voltage and output current; the voltage feedback circuit comprises a resistance voltage sharing circuit for sampling the output voltage, a line loss detection circuit and a controlled current source circuit; a compensation control signal is supplied to the output end of the line loss detection circuit and is in direct proportion to the output current; the controlled current source circuit is provided with a control end, a grounding end and an output end; the control end is coupled to the output end of the line loss detection circuit and receives the compensation control signal; the grounding end is grounded; the output end supplies compensation current; and the output end of the resistance voltage sharing circuit is connected with the output end of the controlled current source circuit to supply feedback voltage which represents backward output voltage.

Description

technical field [0001] The invention mainly relates to a switching power supply, and more particularly relates to a switching voltage stabilizing circuit with a line loss compensation function, a voltage feedback circuit and a voltage feedback method thereof. Background technique [0002] Today, most electronic devices require switching power supplies to provide DC voltage to power them. When the switching power supply supplies power to the load, the sampling of the output voltage is used as the feedback voltage of the control circuit, and after the error amplification of the feedback voltage, the turn-on and turn-off time of the switch tube is adjusted to achieve a constant output voltage. However, when the output wire is long or the wire diameter is small, the output wire between the switching power supply and the load has a large line resistance (such as in the charger solution), and the output current will generate a large voltage when it flows through the output wire. ...

Claims

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Application Information

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IPC IPC(8): H02M3/06H02M3/335
Inventor 王斯然
Owner CHENGDU MONOLITHIC POWER SYST
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