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Cross-mode high-low-voltage compensation circuit

A compensation circuit, high and low voltage technology, applied in the field of switching power supply, to achieve a simple effect

Active Publication Date: 2015-04-22
SHENZHEN SUNMOON MICROELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] Therefore, it is necessary to propose an effective technical solution to solve the problem that the system can maintain the consistency of the maximum output power under the conditions of continuous mode and discontinuous mode

Method used

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  • Cross-mode high-low-voltage compensation circuit

Examples

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Embodiment Construction

[0025] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0026] In order to achieve the purpose of the present invention, the embodiment of the present invention proposes a cross-mode high and low voltage compensation circuit, including a sampling module, an operation module and a comparison module,

[0027] The sampling module is used to sample the electrical signal on the current detection resistor to obtain the reference signal D1;

[0028] The operation module is used to perform operations on the reference signal D1 and the following signal D2 to obtain the product of (D1+D2) and (D1-D2); ...

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Abstract

An embodiment of the invention provides a cross-mode high-low-voltage compensation circuit which comprises a sampling module, an operation module and a comparison module. The sampling module is used for sampling an electric signal on a current sensing resistor to obtain a reference signal D1. The operation module is used for operating the reference signal D1 and a reference signal D2 to obtain product of (D1+D2) and (D1-D2). The comparison module is used for comparing the product of the (D1+D2) and (D1-D2) with a reference value D0 and outputting limit current to control and enable EN_OSC to control starting of a power metal oxide semi-conductor field effect transistor (MOSFET) switch tube. By controlling the maximum variable quantity of inductive current in a primary winding of a transformer, the maximum output power in two working modes of a current continuous mode and a current interrupted mode is kept constant.

Description

technical field [0001] The invention relates to the technical field of switching power supplies, in particular, the invention relates to a cross-mode high and low voltage compensation circuit. Background technique [0002] In the application field of the current-mode PWM switching power supply, it is required that the maximum output power of the system be consistent within a wide voltage (for example, 85V-265V) input range. figure 1 It is a traditional current-mode PWM chip flyback application system. Under normal working conditions, the system compares the detection output with the TL431 error discharger, and obtains the FB signal through the optocoupler feedback, and then the FB signal and the peak current are realized through the PWM_COMP comparator. PWM control. When the output load intensifies, the OC_COMP comparator works, which limits the maximum output power of the system, thereby protecting the system. In this application circuit, the sense resistor R S After the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/315
Inventor 李照华谢靖林道明赵春波王乐康
Owner SHENZHEN SUNMOON MICROELECTRONICS