Pulse Transformer Power Supply Circuit for Wide Input Voltage Charging
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Solution Overview
Problem
Existing charging devices face challenges in providing a continuously adjustable direct current output due to the fixed turns ratio of pulse transformers, which limits their adaptability to different power supplies and requires a narrow voltage range from the power supply.
Innovation Solution
A power supply circuit is introduced, comprising a transformer circuit with a pulse transformer and a switch control circuit, and a first power supply conversion circuit that adjusts the voltage on the secondary winding of the pulse transformer to be within a preset range, using step-up and step-down units to ensure voltage stability across varying power supply conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a pulse transformer with fixed turns ratio is used for voltage modulation, then the circuit structure is simple, but the adaptability to different power supplies is poor and the output voltage adjustable range is limited
Solution Approach 1:
The patent introduces a dynamic voltage adjustment mechanism by adding a first power supply conversion circuit that can convert the voltage from the pulse transformer secondary winding to be within a preset voltage range. This converts the static fixed-ratio transformer system into a dynamic system that can adapt to different input voltages and maintain stable output, thereby improving adaptability without significantly increasing circuit complexity.
Solution Approach 2:
The patent changes the voltage parameter through the first power supply conversion circuit, which adjusts the secondary winding voltage to within a preset range. This parameter conversion enables the system to handle different power supply voltages (e.g., 100V/220V AC) and maintain consistent output voltage, resolving the contradiction between simple circuit structure and adaptability to different power supplies.
2Device complexity
If a pulse transformer with fixed turns ratio is used, then the circuit structure is simple, but the output voltage adjustable range is limited
Solution Approach 1:
The patent transforms the fixed output voltage system into a dynamic adjustable system by introducing the first power supply conversion circuit. This circuit enables continuous voltage adjustment within a preset range, allowing the output voltage to be flexibly controlled according to different charging requirements while maintaining a relatively simple overall circuit structure.
Solution Approach 2:
The first power supply conversion circuit serves multiple functions: it converts the pulse transformer secondary voltage to a preset range, enables continuous voltage adjustment for different charging protocols (such as PD protocol), and ensures stable output voltage. This multi-functional component expands the output voltage adjustable range without proportionally increasing circuit complexity.
3Reliability
If the power supply voltage fluctuates greatly or is too low or too high, then the charging device may fail to operate properly, but adding voltage conversion circuits increases device complexity
Solution Approach 1:
The patent implements prior cushioning by pre-configuring the first power supply conversion circuit to handle voltage fluctuations before they affect the output. This circuit is designed to accommodate a wide range of input voltages and automatically adjust the output voltage to within the preset range, providing protection against voltage instability without requiring complex control mechanisms.
Solution Approach 2:
The patent employs feedback control through the first power supply conversion circuit, which continuously monitors the secondary winding voltage and adjusts it to maintain output within the preset voltage range. This feedback mechanism ensures reliable operation under varying power supply conditions while keeping the control logic relatively simple, thus improving reliability without excessive increase in device complexity.
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
The solution enhances the adaptability of charging devices to different power supplies by ensuring a stable and adjustable output voltage, thereby improving the charging efficiency and compatibility with various electronic devices.
Implementation Method 1
a primary winding of the pulse transformer is connected to a power supply and the switch control circuit, and the switch control circuit is used to modulate a voltage on the primary winding into a pulse voltage
Implementation Method 2
the switch control circuit is used to modulate a voltage on the primary winding into a pulse voltage
Data Source
AI summary
Provided by the present disclosure are a power supply circuit and a charging device. The power supply circuit comprises a pulse transformer circuit and a first power supply conversion circuit. The pulse transformer circuit comprises a pulse transformer and a switch control circuit; a primary winding of the pulse transformer is connected to a power supply and is connected to the switch control circuit, and the switch control circuit is used to modulate the voltage on the primary winding into a pulse voltage; and the input terminal of the first power supply conversion circuit is connected to a secondary winding of the pulse transformer, and is used to transform the voltage on the secondary winding of the pulse transformer into a first preset voltage range when the voltage outputted by the secondary winding exceeds the first preset voltage range, and then output the voltage.