Power Converter Capacitor Segmentation for Fast Mode Transition
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Solution Overview
Problem
Conventional power converters face challenges in minimizing standby power consumption due to long response times and excessive stress on switching devices when transitioning between enable and disable modes, primarily because of the use of large-capacity capacitors.
Innovation Solution
The power converter incorporates a PWM control module with external and internal switches, a disable regulator, and capacitors of varying capacities to manage voltage thresholds and signals, allowing for efficient switching between enable and disable modes, thereby reducing power consumption and stress on devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a large-capacity capacitor is used to supply power to the main circuit, then the power supply stability is improved, but the response time increases and excessive stress is generated on the switching device
Solution Approach 1:
The patent divides the capacitor into two separate capacitors: a first capacitor connected to the VCC pin and a second capacitor connected to the DIS pin. This segmentation allows each capacitor to have optimized capacity for its specific function, eliminating the need for a single large-capacity capacitor and thereby reducing response time while maintaining power supply stability.
Solution Approach 2:
The patent introduces an intermediary circuit involving the first external switch, second external switch, and two capacitors that mediate between the power supply and the PWM control module. This intermediary mechanism enables controlled charging and discharging paths, allowing the system to maintain stable power supply while achieving faster response times during mode transitions.
2Stability of the object's composition
If a large-capacity capacitor is used to supply power to the main circuit, then the power supply stability is improved, but the stress on the switching device increases
Solution Approach 1:
By segmenting the single large capacitor into two smaller capacitors (first capacitor for VCC pin, second capacitor for DIS pin), the patent reduces the stress on the switching device during mode transitions. Each capacitor handles a portion of the power management task, distributing the electrical stress and preventing excessive current surges through the switching device.
Solution Approach 2:
The intermediary circuit with two external switches and two capacitors acts as a buffer between the power supply and the switching device. This intermediary mechanism controls the charging and discharging paths, preventing direct high-stress current flow through the switching device while maintaining stable power supply to the main circuit.
3Ease of operation
If the capacitor completely discharges the charged voltage to enter enable mode from disable mode, then the mode transition is achieved, but the response time becomes long
Solution Approach 1:
The patent segments the capacitor function into two independent capacitors with separate control paths. The first capacitor supplies power to VCC pin while the second capacitor manages the DIS pin. This segmentation allows the system to transition between disable and enable modes without requiring complete discharge of a large capacitor, significantly reducing response time while maintaining operational capability.
Solution Approach 2:
The intermediary circuit involving two external switches and two capacitors provides controlled transition paths between disable and enable modes. Instead of requiring complete discharge of a large capacitor, the intermediary mechanism enables faster mode switching through controlled charging and discharging of smaller capacitors, reducing response time while maintaining ease of operation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enables a short response time for transitioning between modes while minimizing power consumption, reducing stress on switching devices and optimizing power management.
Implementation Method 1
a first capacitor that is connected in parallel to one side of the first external switch, a second external switch configured to provide an enable signal, with one side of the second external switch connected to a DIS pin of the PWM control module and the other side of the second external switch connected to the ground, and a second capacitor that is connected in parallel to one side of the second external switch
Data Source
AI summary
A power converter according to examples reduces standby power consumption. The power converter includes a rectifier configured to rectify AC power into DC power, a transformer configured to output power by converting a voltage of DC power rectified by the rectifier, a PWM control module configured to control an output power by switching a power switching device connected to the transformer, a first external switch configured to provide a disable signal, a first capacitor that is connected in parallel to one side of the first external switch, a second external switch configured to provide an enable signal, and a second capacitor that is connected in parallel to one side of the second external switch.