Power Converter Inductor Current Waveform Convergence
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional power converters face challenges in balancing energy distribution when operating without an equivalent series resistor, leading to noise generation and inefficiencies in ultrasonic and pulse frequency modulation modes, especially when dealing with light loads and human hearing frequency ranges.
Innovation Solution
A power converter design that includes a switch circuit, controller circuit, and driver circuit, utilizing a reference voltage supplying circuit with a comparator, capacitors, resistors, and current sources to converge the inductor current waveform without an equivalent series resistor, allowing for flexible circuit design and improved energy balance across different operating modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If an equivalent series resistor is disposed in the conventional power converter, then energy balance is improved, but ripple of output voltage increases and output voltage decreases more
Solution Approach 1:
The patent removes the equivalent series resistor from the conventional power converter circuit. By extracting this component, the design achieves better energy balance while avoiding the harmful effects of voltage ripple and excessive voltage drop that the resistor caused in traditional designs.
Solution Approach 2:
The patent changes the operating parameters by switching between ultrasonic working mode and pulse frequency modulation mode. This parameter change allows the system to achieve energy balance without requiring an equivalent series resistor, thereby eliminating the associated ripple and voltage drop issues.
2Object-affected harmful factors
If the upper bridge switch is turned on early to increase switching frequency, then audio frequency noise is pushed out of human hearing range, but energy imbalance occurs without equivalent series resistor
Solution Approach 1:
The patent employs parameter changes by transitioning between ultrasonic working mode (where switching frequency exceeds human hearing range) and pulse frequency modulation mode. This dynamic parameter adjustment achieves noise suppression while maintaining energy balance through the controller's coordinated control of bridge switches, eliminating the need for equivalent series resistors.
3Adaptability or versatility
If multi-layer ceramic capacitor is disposed to improve circuit flexibility, then design flexibility is improved, but equivalent series resistor approaches zero causing energy imbalance
Solution Approach 1:
The patent extracts the equivalent series resistor from the circuit by using multi-layer ceramic capacitors with near-zero ESR. Combined with the controller's ultrasonic working mode and pulse frequency modulation capability, this extraction achieves both design flexibility and energy balance without the traditional resistor.
4Device complexity
If equivalent series resistor is not disposed, then circuit simplicity is improved, but non-ideal delay characteristic causes energy dispersion
Solution Approach 1:
The patent maintains circuit simplicity by omitting the equivalent series resistor while compensating for the resulting energy dispersion through parameter changes. The controller dynamically adjusts operating modes (ultrasonic working mode and pulse frequency modulation) and coordinates bridge switch timing to achieve energy balance in the absence of the resistor.
Data Source
AI summary
A power converter is provided. A driver circuit is connected between a controller circuit and a switch circuit. The switch circuit is connected to an inductor. The inductor is connected in series with a first capacitor and grounded through the first capacitor. A first comparison input terminal of a first comparator is connected to an output terminal between the inductor and the first capacitor. A second comparison input terminal of the first comparator is grounded through a second capacitor. The controller circuit outputs a control signal for controlling the driver circuit to drive the switch circuit according to a comparison signal outputted by the first comparator. A reference current source provides a reference current to the second capacitor. A first terminal of a first resistor is connected to the second capacitor. A second terminal of the first resistor is coupled to a reference potential.