Controller and method for generating jitter in constant current mode of power converter

A power converter, constant current control technology, applied in the direction of output power conversion devices, electrical components, etc., to achieve the effect of reducing peak energy

Active Publication Date: 2017-03-01
LEADTREND TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the constant current mode of the power converter, if the voltage jitter on the primary side of the power converter is used to generate the jitter of the switching period of the power switch, the jitter of the switching period of the power switch will be suppressed by the above-mentioned negative feedback cycle eliminate

Method used

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  • Controller and method for generating jitter in constant current mode of power converter
  • Controller and method for generating jitter in constant current mode of power converter
  • Controller and method for generating jitter in constant current mode of power converter

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Embodiment Construction

[0043] Please refer to figure 1 and figure 2 , figure 1 is a schematic diagram illustrating a controller 100 that generates jitter in a constant current mode of a power converter for an embodiment of the present invention, and figure 2 It is a schematic diagram for explaining the primary side current IPRI, the voltage VD, the gate control signal GCS, the secondary side current ISEC, the discharge time TDIS and the period T of the gate control signal GCS. Such as figure 1 As shown, the controller 100 includes a current pin 102 , an auxiliary pin 104 , a constant current control unit 106 and a control signal generation unit 108 . The current pin 102 is used to receive the primary side voltage VPRI determined according to the primary side current IPRI flowing through the power converter and a resistor R; the auxiliary pin 104 is used to receive an auxiliary winding AUX of the related power converter. The voltage VD, wherein the voltage VD is generated by the voltage dividin...

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Abstract

The invention discloses a controller for generating jitter in a constant-current mode of a power converter and a method thereof. The controller comprises a current pin, an auxiliary pin, a constant-current control unit and a control signal generation unit. The current pin is used for receiving a primary-side voltage decided according to a primary-side current flowing through the power converter and a resistance. The auxiliary pin is used for receiving a voltage of an auxiliary winding of the power converter. The constant-current control unit is used for generating an adjustment signal according to the primary-side voltage, a discharging time of the voltage, and a reference voltage, wherein the reference voltage has an amount of voltage jitter within a predetermined range. The control signal generation unit is used for adjusting the cycle of a gate control signal according to the adjustment signal. Therefore, the controller of the invention can enable the cycle of the gate control signal to jitter in a constant-current mode of the power converter so as to disperse energy and reduce peak energy of electromagnetic interference.

Description

technical field [0001] The invention relates to a controller and method for generating jitter in a power converter, especially to a controller and method for generating jitter in a constant current mode of the power converter. Background technique [0002] In the constant current mode of the power converter, the controller used to control the power switch on the primary side of the power converter includes a peak controller, a discharge time detector, a constant current controller, and a voltage-controlled oscillator (voltage-controlled oscillator). , VCO), and these devices can be applied to the constant current mode operation of the power converter, so that the current obtained by the output load is approximately a predetermined constant current. [0003] The peak controller is effective to cause the highest peak current flowing through the secondary winding of the power converter to be a predetermined value. The discharge time detector generates a discharge signal throug...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/44
Inventor 黄于芸沈逸伦
Owner LEADTREND TECH
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