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Saw tooth wave generator of boost-buck power supply converter and method

A technology of power converters and sawtooth waves, which is applied in the direction of pulse generation, output power conversion devices, electrical components, etc., can solve the problems of inconvenient buck-boost power converters and immediate response of error signals

Inactive Publication Date: 2011-05-11
RICHTEK TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the error amplifier needs to be compensated to satisfy the stability of the power converter 10, the closed loop and the compensator 18 will prevent the error signal VEA from responding immediately when the input voltage Vin changes, so that the output voltage Vout returns to the original set value
[0003] Therefore, there are above-mentioned inconveniences and problems in the known buck-boost power converters.

Method used

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  • Saw tooth wave generator of boost-buck power supply converter and method
  • Saw tooth wave generator of boost-buck power supply converter and method
  • Saw tooth wave generator of boost-buck power supply converter and method

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Embodiment Construction

[0096] The present invention will be further described below with reference to the embodiments and the accompanying drawings.

[0097] see now image 3 , image 3 The relationship between the duty cycle Dbuck and the buck sawtooth signal SAWbuck when the buck-boost power converter operates in the buck mode is shown. As shown in the figure, the waveform 40 is the buck sawtooth signal SAWbuck, and the waveform 42 is the error The signals VEA and VH are the peak values ​​of the step-down sawtooth wave signal SAWbuck, and VL is the valley value of the step-down sawtooth wave signal SAWbuck. according to image 3 The similar triangles ABC and ADE in the

[0098] Vout / Vin=Dbuck=(VEA-VL) / (VH-VL) Equation 1

[0099] It can be seen from formula 1 that when the input voltage Vin changes, if you want the output voltage Vout and the error signal VEA to remain unchanged, you can adjust the valley value VL and peak value VH of the step-down sawtooth wave signal SAWbuck, and then change ...

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Abstract

The invention discloses a method for generating saw tooth wave signals in a boost-buck power supply converter. The boost-buck power supply converter is used for converting an input voltage into an output voltage. The method is characterized by comprising the following steps of: 1, detecting the input voltage; and 2, providing a first saw tooth wave signal and a second saw tooth wave signal according to the input voltage, wherein the peak value of the first saw tooth wave signal is changed together with the input voltage, and the valley value of the second saw tooth wave signal is changed together with the input voltage. A saw tooth wave generator of the boost-buck power supply converter and the saw tooth wave signal generating method have the advantage of quickly responding to stabilize the output voltage when the input voltage is changed.

Description

technical field [0001] The present invention relates to a power converter, in particular to a sawtooth wave generator of a buck-boost power converter and a method thereof. Background technique [0002] figure 1 The conventional buck-boost power converter 10 is shown, wherein the power stage 12 converts the input voltage Vin into the output voltage Vout to the load RL according to the signals PWM1 and PWM2, the output voltage Vout is divided by the resistors R1 and R2 to generate the feedback signal VFB, and the error amplifier 20 Amplifies the difference between the feedback signal VFB and the reference voltage Vref to generate the error signal VEA. In order to stabilize the overall system, the compensator 18 provides the sawtooth wave signal SAWbuck and SAWboost from the sawtooth generator 22, and the comparators 14 and 16 according to the error signal VEA And sawtooth wave signals SAWbuck and SAWboost generate signals PWM1 and PWM2. figure 2 show figure 1 The waveform ...

Claims

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Application Information

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IPC IPC(8): H02M1/08H03K4/08
Inventor 陈科宏黄柄境何心欣
Owner RICHTEK TECH
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