Apparatus for regulating a bias-voltage of a switching power supply

A technology of bias voltage and switch adjustment, which is applied in the direction of adjusting electrical variables, conversion equipment without intermediate conversion to AC, control/regulation systems, etc., and can solve problems such as power loss

Pending Publication Date: 2021-06-08
SILANNA ASIA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As an example, for a power supply with an adjustable output voltage of 3 to 21V (7:1 variation), if a bias voltage of 12V is required, the voltage across the windings will have a range of 12V to 84V. Unfortunately, in this example , the overvoltage of the winding would need to be dropped across the entire circuit to generate the bias voltage, such as, for example, with a low dropout (“LDO”) regulator, and power would be lost (e.g., as heat)
Typically the power loss will be equal to the voltage drop times the current across the circuit

Method used

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  • Apparatus for regulating a bias-voltage of a switching power supply
  • Apparatus for regulating a bias-voltage of a switching power supply
  • Apparatus for regulating a bias-voltage of a switching power supply

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Embodiment Construction

[0018] In the following description, the same reference numerals are used to identify the same elements. Furthermore, the drawings are intended to illustrate key features of the exemplary embodiments in a diagrammatic manner. The drawings are not intended to depict every feature of actual implementations nor relative dimensions of the depicted elements, and are not drawn to scale.

[0019] The invention discloses a device for adjusting the bias voltage of a switching power supply. The device includes a cascode amplifier, a feedback circuit, and a bias regulator circuit. The cascode amplifier includes a common-gate transistor and a common-source transistor, wherein the source of the common-gate transistor is in signal communication with the drain of the common-source transistor. The feedback circuit is in signal communication with the source of the common-gate transistor and the drain of the common-source transistor, and the bias regulator circuit is in signal communication w...

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Abstract

An apparatus for regulating a bias-voltage of a switching power supply is disclosed. The apparatus includes a cascode amplifier, feedback-circuit, and bias-regulator circuit. The cascode amplifier includes a common-gate transistor and common-source transistor, where a source of the common-gate transistor is in signal communication with a drain of the common-source transistor. The feedback-circuit is in signal communication with the source of the common-gate transistor and the drain of the common-source transistor and the bias-regulator circuit is in signal communication with a gate of the common-source transistor, a gate of the common-gate transistor, and the feedback-circuit. The feedback-circuit receives a drain-voltage from the drain of the common-source transistor and produces a feedback-voltage and the bias-regulator circuit is configured to receive the feedback-voltage and produce and regulate the bias-voltage. A gate-voltage is produced from the bias-voltage and the gate-voltage is injected into the gate of the common-gate transistor.

Description

[0001] related application [0002] This application claims the benefit of U.S. Nonprovisional Patent Application No. 16 / 178,426, entitled "Apparatus for Regulating Bias Voltage of a Switching Power Supply," filed November 1, 2018, which is incorporated by reference for all purposes way incorporated into this article. Background technique [0003] Today, the presence and use of electrodynamic devices has become commonplace. Modern power supplies are used to power or recharge many of these electric electronic devices. In charging applications, it may be necessary to adjust the power output of these supplies. For example, USB-PD power supplies typically have a power output that is adjustable and varies from about 3 to 21 volts ("V"). Many of these types of power supplies are offline switching power supplies. [0004] Conventional off-line power supplies have operational requirements that depend on bias voltages for proper operation including start-up and steady state. Speci...

Claims

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Application Information

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IPC IPC(8): H02M3/156H02M1/08H02M1/00
CPCG05F1/461G05F1/575G05F1/618H02M3/33507H02M1/08H02M3/156H02M1/0003H02M3/07H02M1/0045
InventorS.I.小霍奇
OwnerSILANNA ASIA