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Nonlinear slope compensation circuit irrelevant to temperature

A slope compensation and nonlinear technology, applied in the field of slope compensation, can solve problems such as aggravated compensation, insufficient compensation system instability, aggravated compensation problems, etc., to achieve stable and reliable operation, good temperature stability, and simple circuit implementation.

Active Publication Date: 2015-02-18
南京国博电子股份有限公司
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Problems solved by technology

If the compensation voltage has a positive temperature coefficient, the problem of overcompensation will be exacerbated at high temperatures, and at low temperatures it may be insufficiently compensated and the system may become unstable; if the compensation voltage has a negative temperature coefficient, it may be insufficiently compensated at high temperatures or exacerbated overcompensation under conditions

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Embodiment Construction

[0018] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0019] figure 1 A logical block diagram of the present invention is shown. like figure 1 As shown, the present invention includes: a linear voltage generating circuit, a nonlinear voltage generating circuit, a reference voltage source IB and a reference current source VR. The linear voltage generating circuit and the nonlinear voltage generating circuit are sequentially connected. The linear voltage generating circuit converts the power tube switch control signal DH into a linear ramp signal VC under the cooperation of the reference current source IB, and outputs the linear ramp signal VC to the nonlinear voltage generating circuit. Under the cooperation of the reference voltage source VR, the nonlinear generating circuit generates a nonlinear voltage Vramp for slope compensation. The generated nonlinear voltage Vramp has the characteris...

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Abstract

The invention discloses a nonlinear slope compensation circuit irrelevant to temperature. The nonlinear slope compensation circuit comprises a linear voltage generation circuit, a nonlinear voltage generation circuit, a reference current source and a reference voltage source, wherein in cooperation with the reference current source, the linear voltage generation circuit converts a switching control signal of a power tube into a linear slope signal and outputs the linear slope signal to the nonlinear voltage generation circuit; in cooperation with the reference voltage source, the nonlinear voltage generation circuit converts the linear slope signal into nonlinear slope compensation voltage irrelevant to the temperature. The nonlinear slope compensation circuit has the advantages that the slope factor of a slope can be increased along with the increase of duty ratio, the problem of over-compensation under the condition of low duty ratio caused by the compensation of the slope with the fixed slope factor is reduced, and the compensation accuracy is improved; moreover, the output compensated voltage is irrelevant to the temperature, the temperature stability is high, and the circuit is easy to implement and is stable and reliable to work.

Description

technical field [0001] The invention relates to a slope compensation technology of a peak current mode control chip, in particular to a nonlinear slope compensation circuit. Background technique [0002] Switching power supplies are widely used in portable electronic devices, and their control methods can be divided into two types: voltage mode and current mode. The current mode can be divided into peak current mode (PCM, Peak Current Mode) and average current mode (ACM, Average Current Mode). Both the peak current mode and the average current mode can work respectively in the inductor current continuous mode (CCM, Current Continuous Mode) and the inductor current discontinuous mode (DCM, Discontinuous Current Mode). [0003] The peak current mode is the most widely used control mode. Its main advantages are: 1. It can realize the current control function cycle by cycle and has a fast dynamic response capability; 2. The entire feedback loop can be simplified into a first-or...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/567
Inventor 范建林刘迎迎史训南朱波徐义强
Owner 南京国博电子股份有限公司
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