Charging Device Dynamic Frequency Control Wide Voltage Range
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Solution Overview
Problem
Conventional charging devices struggle to output charging power with high accuracy across a wide voltage range of tens to hundreds of volts due to non-linearity in duty cycle control, especially at lower duty cycles, leading to increased production costs and device size when using high-speed or parallel elements.
Innovation Solution
A charging device with a control portion that adjusts the output interval of the control signal in addition to pulse width, allowing the converter to operate within a linear duty cycle range by lengthening the output interval as the charging voltage decreases, thereby maintaining accurate voltage output across the wide range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the duty cycle of the switching element is increased to raise charging voltage, then higher charging voltage is achieved, but the linearity of duty cycle over charging voltage is maintained only in a limited range
Solution Approach 1:
The invention dynamically adjusts the switching frequency of the converter portion based on the charging voltage level. When charging voltage is high, the switching frequency is increased to maintain the switching elements in a high-speed state where linearity is maintained. When charging voltage is low, the switching frequency is decreased to allow longer pulse widths that maintain linearity. This dynamic frequency adjustment resolves the contradiction between achieving high charging voltage and maintaining duty cycle linearity across the entire voltage range.
Solution Approach 2:
The invention changes the switching frequency parameter of the converter portion according to the charging voltage level. By adjusting this parameter dynamically, the system maintains optimal operating conditions for the switching elements across different voltage ranges, ensuring linearity is preserved whether operating at high or low charging voltages.
2Manufacturing precision
If expensive high-speed switching elements are used to maintain linearity at low duty cycles, then accurate low voltage output is achieved, but production cost increases
Solution Approach 1:
Instead of using expensive high-speed switching elements continuously, the invention dynamically adjusts the switching frequency to match the operating conditions. At low voltage levels, the switching frequency is reduced, allowing standard switching elements to operate within their linear range. This eliminates the need for expensive specialized components while maintaining accurate low voltage output.
Solution Approach 2:
The invention changes the operating frequency parameter to accommodate standard switching elements across the entire voltage range. By lowering the frequency requirement at low voltages, the system can use conventional, cost-effective components rather than expensive high-speed elements, thereby reducing production costs while maintaining manufacturing precision.
3Manufacturing precision
If multiple elements are used in parallel to achieve high-speed switching performance, then accurate low voltage output is achieved, but device size increases
Solution Approach 1:
The invention uses dynamic frequency adjustment to allow single switching elements to operate in their linear range at low voltages by reducing the switching frequency. This eliminates the need for parallel element configurations, thereby maintaining accurate low voltage output without increasing device size.
4Power
If the pulse width of control signal is narrowed to output low charging voltage, then desired low voltage value is achieved, but the converter portion cannot follow the control signal due to non-linearity
Solution Approach 1:
The invention dynamically adjusts the switching frequency downward when low charging voltage is required. This allows the control signal pulse width to be extended while maintaining the switching elements in a state where they can reliably follow the control signal. The frequency adjustment ensures that even at low voltages, the switching elements operate within their linear response range, maintaining reliability.
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
Enables the charging device to output charging power with high accuracy across a wide voltage range from tens to hundreds of volts, reducing production costs and device size by maintaining linearity in duty cycle operation.
Implementation Method 1
converts an alternating-current voltage, which is supplied externally, into a direct-current voltage by rectification and smoothing
Implementation Method 2
generates charging power at a desired voltage value by a converter portion stepping up or down the direct-current voltage
Data Source
AI summary
The present invention addresses the problem of providing a charging device capable of precisely outputting charging power to a battery or the like within a broad voltage range of tens-to-hundreds of volts. This charging device comprises: a converter unit that outputs a charging voltage to a battery and a control unit that outputs a control signal of a pulse width determined on the basis of the voltage value of the charging voltage to a switching element of the converter unit, thereby setting the switching element to a conducting state for only a time corresponding to the pulse width. The control unit changes the output interval for the control signal in accordance with the output interval for the control signal as the voltage value of the charging voltage decreases.