DC-DC Power Supply Control Circuit for Low-Voltage Protection
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Solution Overview
Problem
Existing DC-DC power supplies experience repeated turn-on and turn-off cycles due to fluctuations in input voltage near the minimum working voltage, causing instability and potential damage to load circuits, with no effective solution currently available to address this issue.
Innovation Solution
A DC-DC power supply control circuit incorporating a voltage stabilizing diode, resistors, and triodes or field effect transistors, where the resistance values of the resistors are specifically chosen to manage the input voltage, preventing the power supply from turning on or off excessively by adjusting the enable end voltage through the turn-on or turn-off of the transistors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the DC-DC power supply operates without voltage fluctuation protection, then the power supply can turn on normally, but the power supply repeatedly turns on and off when input voltage fluctuates near the minimum working voltage, causing output voltage instability and potential load damage
Solution Approach 1:
The control circuit proactively detects when the input voltage is near the minimum working voltage threshold and preemptively disables the power supply before voltage fluctuations can occur. The voltage stabilizing diode and resistor network monitor the input voltage and trigger the disable signal in advance, preventing the harmful on-off cycling before it starts.
Solution Approach 2:
The patent introduces a control circuit as an intermediary between the input voltage source and the DC-DC power supply. This control circuit, comprising voltage stabilizing diodes, resistors, and transistors, mediates the connection by monitoring input voltage and conditionally enabling/disabling the power supply based on voltage thresholds, thus isolating the load from voltage fluctuations.
2Reliability
If a control circuit is added to prevent repeated turn-on and turn-off, then the power supply stability is improved, but the device complexity increases
Solution Approach 1:
The control circuit is segmented into distinct functional modules: voltage detection (voltage stabilizing diode), signal conditioning (resistor network), and switching control (transistor pair). Each component has a specific function, making the overall circuit easier to design, analyze, and implement while achieving the reliability goal.
Solution Approach 2:
The control circuit is self-regulating through the inherent properties of the voltage stabilizing diode and resistor network. The circuit automatically detects voltage conditions and triggers the appropriate disable signal without requiring external control logic or microcontrollers, simplifying the overall system while 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
This solution effectively prevents frequent turn-on and turn-off cycles of the DC-DC power supply, ensuring stable operation by automatically switching off the power supply at low voltages and only turning it back on when the voltage reaches the normal working level, thus protecting the load circuit from voltage fluctuations.
Implementation Method 1
a negative electrode end of the voltage stabilizing diode is connected with an output end of the DC-DC power supply, and a positive electrode end of the voltage stabilizing diode is connected with a base electrode of the first triode
Data Source
Figure 1~2
AI summary
A DC-DC power supply control circuit and an electronic device are provided, wherein the DC-DC power supply control circuit comprises: a voltage stabilizing diode (1), a first resistor (2), a second resistor (3), a third resistor (4), a first triode (5) and a second triode (6); two ends of the first resistor (2) are connected with an input end (7) of the DC-DC power supply and an enable end (8) of the DC-DC power supply respectively; two ends of the second resistor (3) are connected with the enable end (8) of the DC-DC power supply and a collector of the second triode (6); a base electrode and an emitting electrode of the second triode (6) are connected with a collector of the first triode (5) and the ground respectively; a negative electrode end and a positive electrode end of the voltage stabilizing diode (1) are connected with an output end (9) of the DC-DC power supply and a base electrode of the first triode (5) respectively; two ends of the third resistor (4) are connected with the base electrode of the first triode (5) and the ground respectively; and an emitting electrode of the first triode (5) is grounded, thereby achieving a low-voltage automatic switch-off protection of the DC-DC power supply.