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Compensating controller of PWM converter and PWM control circuit

A technology for compensating controllers and control circuits, applied in control/regulation systems, output power conversion devices, instruments, etc., can solve the problems of increasing the complexity of the external circuit of the chip and occupying the PCB area.

Active Publication Date: 2011-01-19
BCD (SHANGHAI) MICRO ELECTRONICS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0022] At the same time, it increases the complexity of the external circuit of the chip and occupies the PCB area.

Method used

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  • Compensating controller of PWM converter and PWM control circuit
  • Compensating controller of PWM converter and PWM control circuit
  • Compensating controller of PWM converter and PWM control circuit

Examples

Experimental program
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Embodiment Construction

[0041] The technical problem to be solved by the present invention is to provide a controller and a PWM control circuit for compensating the relationship between the maximum output power of a PWM converter and the input voltage by using a triangular wave.

[0042] In order to more clearly illustrate the principles of the embodiments of the present invention or the technical solutions in the prior art, the following combined figure 1 Be specific.

[0043] see figure 2 , which is a circuit diagram of a PWM control circuit applied to a compensation controller of a PWM converter according to an embodiment of the present invention.

[0044] The compensation controller 200 for a PWM converter described in the embodiment of the present invention is used in a PWM control circuit.

[0045] The input voltage Vin supplies power to the VCC terminal of the compensation controller 200 after passing through the resistor 101 . The current of the secondary winding of the transformer 109 is...

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PUM

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Abstract

The invention relates to a compensating controller of PWM converter, use in a PWM control circuit. The compensating controller includes: the terminal S of an RS trigger receives a square wave generated by an oscillator, the terminal R of the RS trigger receives the output signal of an and gate, and the terminal Q of the trigger is an output terminal; a sawtooth wave after a triangular wave generated by the oscillator is processed by a processor is accumulated with an induced voltage, and the result after accumulation is sent to an overcurrent comparator; the output terminal of the overcurrentcomparator is connected with the input terminal of the and gate; the other input terminal of the and gate is connected with the output terminal of a PWM comparator; and the two signals received by the PWM comparator are respectively a feedback network signal and a signal that the triangular wave is superimposed after the induced voltage is subject to and processing.

Description

technical field [0001] The invention relates to the technical field of PWM controllers, in particular to a controller and a compensation circuit for compensating the relationship between the maximum output power and input voltage of a PWM converter. Background technique [0002] PWM control technology is widely used in various switching power supply controllers to provide suitable working voltage and current for different circuit modules. In order to protect the power supply itself and the load, the PWM controller integrates various protection functions, such as over-voltage protection (OVP), over-current protection (OCP), over-temperature protection (OTP) protection, etc. Among them, cycle-by-cycle over-current protection (OCP) is also used to limit the maximum output power of the converter when the output is overloaded and short-circuited. [0003] When the PWM converter output current reaches the set over-current protection point, the PWM controller will turn off the out...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/338
Inventor 应征
Owner BCD (SHANGHAI) MICRO ELECTRONICS LTD