Parameter Setting Circuit for Power Conversion Apparatus
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Solution Overview
Problem
Conventional parameter setting circuits for power conversion apparatuses face challenges in accurately generating a setting current due to uncertainties in internal resistor values, leading to deviations in current values and increased manufacturing costs from requiring multiple pins and circuit structures.
Innovation Solution
A parameter setting circuit with a switch unit, internal parameter adjustment unit, and setting unit, which includes a comparator and variable resistor, adjusts the resistance value or current based on comparison results to achieve a predetermined parameter ratio, ensuring accurate generation of a setting current using a single pin connection to the external setting impedor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If an internal resistor is serially coupled to an external setting impedor to generate a setting current, then the circuit structure is simple, but the current value deviates due to inaccurate resistance value determination
Solution Approach 1:
The patent implements a feedback mechanism where the generated setting current is fed back to the parameter setting circuit through the external setting impedor. The circuit continuously adjusts the internal resistor value based on the feedback signal to maintain the predetermined parameter ratio, thereby compensating for resistance value deviations and ensuring accurate current generation without increasing circuit complexity
Solution Approach 2:
The patent dynamically changes the resistance value of the internal resistor based on feedback from the external setting impedor. By adjusting the resistor parameter in real-time to maintain the predetermined parameter ratio, the system achieves accurate current generation while keeping the circuit structure simple
2Measurement precision
If different pins are provided in the parameter setting circuit to be coupled to specific voltage and external setting impedor, then current generation accuracy is improved, but manufacturing cost increases
Solution Approach 1:
The patent makes a single pin serve multiple functions by coupling it to both the specific voltage and the external setting impedor simultaneously. This multi-functional pin design achieves accurate current generation through feedback while avoiding the need for multiple separate pins, thereby reducing manufacturing cost
Solution Approach 2:
The patent merges the functions of multiple pins into a single pin by establishing a circuit configuration where one pin is coupled to both the specific voltage source and the external setting impedor. This consolidation maintains measurement precision while simplifying the physical structure and reducing manufacturing cost
Data Source
AI summary
A method for generating a current adapted to a parameter setting circuit is provided. The parameter setting circuit is coupled to an external setting impedor. The external setting impedor is coupled to an external voltage and outputs a first current. The method for generating the current includes the following steps. A reference voltage and an end voltage of a reference resistor are compared to get a comparison result. The end voltage is adjusted according to a comparison result. A setting parameter is obtained according to the adjusted end voltage. A setting current is generated according to a compensation current. The compensation current is related to a first current and the setting parameter. In addition, a parameter setting circuit of a power conversion apparatus is also provided.