DCDC converter load transient response circuit for improving peak current mode
A peak current mode, load transient technology, applied in related fields, can solve problems such as poor transient response, achieve the effect of increasing frequency, improving transient response, and suppressing the amplitude of overshoot
Active Publication Date: 2020-11-24
SG MICRO
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- Application Information
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Problems solved by technology
The peak current mode DCDC converter is a more commonly used power conversion technology realized by current mode control. It obtains better dynamic performance and higher output accuracy through the combination of current sampling circuit, error amplifier, PWM comparator and oscillator. etc., but the inventors found that the peak current mode DCDC converter in the prior art has poor transient response when there is a load jump
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Embodiment Construction
[0017] Below with the accompanying drawings ( Figure 1-Figure 4 ) to illustrate the present invention.
[0018] figure 1 It is a structural schematic diagram of an improved load transient response circuit of a peak current mode DCDC converter implementing the present invention. figure 2 It is the effect diagram of load transient response implementing the circuit of the present invention. image 3 It is a structural schematic diagram of the oscillator adjustment circuit used in the implementation of the present invention. Figure 4 It is a structural schematic diagram of another oscillator adjustment circuit used in the implementation of the present invention. Such as Figure 1 to Figure 4 As shown, a circuit for improving the load transient response of a peak current mode DCDC converter includes a control logic circuit, a comparator Comp and an oscillator OSC, and the output terminal of the comparator Comp is connected to the first input terminal of the control logic cir...
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The invention discloses a DCDC converter load transient response circuit for improving a peak current mode. The transient response of the DCDC converter during load jump can be improved, so that the fluctuation of the output voltage or the uprush and undershoot amplitudes can be better reduced. The DCDC converter load transient response circuit is characterized in that: the circuit comprises a control logic circuit, a comparator and an oscillator, the output end of the comparator is connected with the first input end of the control logic circuit; the positive input end of the comparator is connected with the output end of the error amplifier; the output end of the oscillator is connected with the second input end of the control logic circuit, an oscillator adjusting circuit is arranged between the input end of the oscillator and the output end of the error amplifier, the negative input end of the error amplifier is connected with the output voltage end, and the positive input end of the error amplifier is connected with the reference voltage end.
Description
technical field [0001] The present invention relates to peak current mode DCDC converter load jump transient response technology, in particular to an improved peak current mode DCDC converter load transient response circuit, by adding an oscillator adjustment circuit between the output terminal of the error amplifier and the oscillator The switching frequency control signal output by the oscillator is changed to improve the transient response of the DCDC converter when the load jumps, so as to better reduce the amplitude of the overshoot or undershoot when the output voltage fluctuates. Background technique [0002] A DCDC converter is a circuit that converts a DC input voltage into another DC voltage value and then outputs it. The peak current mode DCDC converter is a more commonly used power conversion technology realized by current mode control. It obtains better dynamic performance and higher output accuracy through the combination of current sampling circuit, error ampl...
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Login to View More IPC IPC(8): H02M3/158H02M1/14
CPCH02M3/158H02M1/14
Inventor 王宇
Owner SG MICRO