DC-DC Converting Circuit Voltage Limiting for Stable Charging
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Solution Overview
Problem
Existing DC-DC converting circuits in small electronic devices often have overlapping functions and inefficiencies, particularly in charging batteries, due to the lack of effective voltage limiting and current regulation, leading to increased power consumption and heat emission.
Innovation Solution
A DC-DC converting circuit with a voltage converter, output voltage regulator, voltage limiter, current sensor, and driving signal generator that regulates output voltage and current, and includes a voltage limiter to maintain the voltage of control signals below a threshold, ensuring stable charging and efficient power management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple DC-DC converting circuits are used to provide different voltage conversion functions, then the adaptability of the power management system is improved, but the device complexity and circuit area increase
Solution Approach 1:
The patent implements a single DC-DC converting circuit that can perform multiple voltage conversion functions (5.5V to 25V, 5V to 4.2V, etc.) by using a controllable switching mechanism. The circuit can be configured to operate in different conversion modes through control signals that adjust the switching timing and duty cycle, eliminating the need for multiple separate converter circuits while maintaining full functional coverage.
Solution Approach 2:
The patent employs dynamic control of the switching element within the DC-DC converter, where the switching timing and duration are adjusted based on the desired conversion mode. This dynamic configuration allows the same hardware circuit to adapt its behavior for different voltage conversion requirements, providing versatility without increasing physical circuit complexity.
2Reliability
If voltage limiting is not implemented in the control signal, then the circuit operation is simpler, but the reliability and stability of charging deteriorate when output voltage is low
Solution Approach 1:
The patent introduces a voltage limiting circuit as an intermediary component between the output voltage regulator and the driving signal generator. This limiting circuit clamps the control signal voltage to a maximum threshold value, preventing excessive control signals from causing instability during low output voltage conditions (such as battery charging). The voltage limiter acts as a protective mediator that ensures reliable operation without significantly complicating the overall control architecture.
3Ease of operation
If the output voltage is allowed to drop below regulated value during battery charging, then the ease of operation is improved, but the loss of energy increases due to unstable current
Solution Approach 1:
The patent implements a feedback control mechanism where the output voltage regulator continuously monitors the output voltage and adjusts the control signal accordingly. When the output voltage drops during battery charging, the regulator detects this deviation and modifies the driving signal to restore proper voltage levels, preventing energy loss from unstable current while maintaining ease of battery charging operation.
Data Source
AI summary
A direct current (DC)-DC converting circuit includes a voltage converter generating a regulation current in response to a driving signal and generating an output voltage and an output current; an output voltage regulator regulating the output voltage and outputting a first control signal; a voltage limiter limiting a voltage value of the first control signal below a threshold value; a current sensor sensing an intensity of the regulation current and generating a second control signal having a voltage value corresponding to a value of the sensed intensity; and a driving signal generator generating the driving signal based on the first and second control signals, the first control signal having the voltage value below the threshold value.