A dual HRPWM driven half-bridge anti-common circuit and method

By using a combination module of resistor R1 and AND gate chip U1 in the digital power supply, a low-cost dual HRPWM drive half-bridge anti-compete circuit was implemented, which solved the problem of large current ripple in the lithium battery charging and discharging test of the earlier TI C2000 series DSP, improved the power supply output quality and reduced the cost.

CN117134753BActive Publication Date: 2026-07-17FUJIAN NEBULA ELECTRONICS CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
FUJIAN NEBULA ELECTRONICS CO LTD
Filing Date
2023-07-14
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

In existing technologies, digital power supplies using TI's earlier C2000 series DSPs cannot simultaneously reduce charging and discharging current ripple during lithium battery charging and discharging tests, resulting in large current ripple, posing safety hazards and incurring high costs. Furthermore, optimization effects by reducing switching frequency or increasing inductance are limited.

Method used

An anti-common-pass module composed of resistor R1 and AND gate chip U1 combines a PWM signal with HRPWM function and a PWM signal without HRPWM function. The HRPWM signal is output to MOSFET Q1 through resistor R1. The AND gate chip U1 performs AND operation on the signal and outputs a signal with HRPWM function and dead time to MOSFET Q2, thereby realizing HRPWM control of the charging and discharging direction.

Benefits of technology

While reducing the charging and discharging current ripple of the digital power supply, it avoids the risk of common connection between the upper and lower bridge arms, reduces the cost of the DSP, improves the power output quality, and avoids the impact of current ripple on the temperature rise of the lithium battery.

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Abstract

This invention provides a dual HRPWM drive half-bridge anti-compete circuit and method in the field of digital power supply technology. The circuit includes a DSP, an anti-compete module, and a half-bridge topology. The anti-compete module includes a resistor R1, a capacitor C1, and an AND gate chip U1. The half-bridge topology includes a capacitor C2, a capacitor C3, an inductor L1, a MOSFET Q1, and a MOSFET Q2. One end of the resistor R1 is connected to the HRPWM1A pin of the DSP, and the other end is connected to the gate (G) of the MOSFET Q1. Pin 1 of the AND gate chip U1 is connected to the HRPWM2A pin of the DSP, pin 2 is connected to the PWM1B pin of the DSP, pin 3 is grounded, pin 4 is connected to the gate (G) of the MOSFET Q2, and pin 5 is connected to the capacitor C1. One end of the capacitor C2 is connected to the drain (D) of the MOSFET Q1, and the other end is connected to the source (S) of the MOSFET Q2 and the capacitor C3. One end of the inductor L1 is connected to the source (S) of the MOSFET Q1 and the drain (D) of the MOSFET Q2, and the other end is connected to the capacitor C3. The advantage of this invention is that it achieves low-cost reduction of current ripple during digital power supply charging and discharging.
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