DC‐DC converters are needed to efficiently convert between different voltage levels within the electrical
architecture of LFP (Large Format Printing) products. Traditionally, analog solutions have been presented to
implement the controller of the converter, but this solution presents several limitations in terms of flexibility,
To overcome these limitations, digital solutions, for instance based in a MCU (microcontroller) are being
proposed, since new applications in the field of power electronics can be targeted with MCUs at a very
competitive cost, due to the advances of these devices not only in terms of computational and memory
features, but also in terms of embedded peripherals such as comparators, DACs, operational amplifiers, etc.
When a DC‐DC Boost Converter is controlled with a PCMC (Peak Current Mode Control) scheme, subharmonic
oscillations can occur. To overcome this issue, slope‐compensation must be implemented, which consists of
adding an additional slope to the sensed inductor current signal. When the inductor current is sensed on the
HS (High‐Side), it is preferred to implement the slope compensation by subtracting this additional slope to the
control signal. In more advanced MCUs, sawtooth generators are usually embedded in the DAC channels
employed for the control signal generation, so that slope‐compensation can be easily implemented. However,
these MCUs are usually out of scope when low‐cost is targeted.
In consequence, this works presents a simple electronic solution to implement slope‐compensation by
subtracting a sawtooth signal from the control signal, mainly based in a capacitor and a discharge current
source. Three possible implementations are presented for the current source, trading‐off complexity, and
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INC, HP, "SAWTOOTH GENERATOR CIRCUIT TO APPLY SLOPE-COMPENSATION ON CONTROL SIGNAL FOR DC-DC CONVERTER UNDER DIGITAL PCMC SCHEME", Technical Disclosure Commons, (October 12, 2021)