DC to DC Converter Pulse Generation via Assistant Winding
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Solution Overview
Problem
The high cost of DC to DC converters is attributed to the expensive PWM circuit, which is necessary for generating pulse signals to control the transistor in the conversion process.
Innovation Solution
A DC to DC converter design that eliminates the need for a PWM circuit by using a pulse generating circuit with a diode, resistor, and capacitor to generate a negative pulse signal, allowing the assistant winding to operate in a flyback mode and control the transistor switching, thereby simplifying the configuration and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a PWM circuit is used to generate pulse signals for controlling the transistor, then the voltage conversion and transistor control functions are achieved, but the cost of the DC to DC converter increases significantly
Solution Approach 1:
The patent extracts and removes the PWM circuit from the DC to DC converter system. Instead of using a dedicated PWM circuit, the invention uses a simple RC circuit (resistor-capacitor) connected to the assistant winding to generate the necessary pulse signals. This extraction eliminates the expensive component while maintaining the essential control function through an alternative, simpler mechanism.
Solution Approach 2:
The patent replaces the expensive PWM circuit with inexpensive passive components (resistor and capacitor) that form a simple pulse generating circuit. These cheap components can be easily replaced or adjusted without significant cost impact, thereby reducing the overall manufacturing cost while still achieving the required pulse signal generation for transistor control.
2Ease of operation
If a PWM circuit is used for pulse signal generation, then precise transistor switching control is achieved, but the device complexity increases
Solution Approach 1:
The patent removes the complex PWM circuit from the system and replaces it with a simple RC circuit. The pulse signal generation function is extracted from the dedicated PWM circuit and implemented through the natural charging and discharging characteristics of the capacitor in the RC circuit, which is controlled by the assistant winding's voltage changes during transistor switching.
Solution Approach 2:
The RC circuit automatically generates the pulse signals needed for transistor control through its inherent electrical characteristics. The capacitor charges and discharges in response to the voltage changes from the assistant winding, self-generating the control pulses without requiring external control logic or complex circuitry. This self-service mechanism simplifies the overall 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
This design reduces the overall cost of the DC to DC converter by eliminating the need for an expensive PWM circuit while maintaining efficient voltage conversion and pulse signal generation, resulting in a more economical solution.
Implementation Method 1
The assistant winding 152 induces the primary winding 151, generates an operation voltage
Implementation Method 2
When the transistor 19 is switched off, the energy stored in the primary winding 151 of the transformer 15 transfers to the secondary winding 153
Data Source
AI summary
An exemplary DC to DC converter (2) includes a transistor (29), a first rectifying and filtering circuit (21), a pulse generating circuit (27) and a transformer (25). The first rectifying and filtering circuit transforms an external AC voltage to a first DC voltage. The transformer includes a primary winding (251), an assistant winding (252) connected with the primary winding in a flyback mode, and a secondary winding (253). The first DC voltage is connected to ground via the primary winding, the transistor in series. The pulse generating circuit includes a controlling terminal, a diode, a resistor, and a capacitor. One terminal of the assistant winding is connected to ground, and the other terminal of the assistant winding is connected to an anode of the diode. A cathode of the diode is connected to ground via the resistor and the capacitor in series. The controlling terminal is connected to gate electrode of the transistor.