Power Supply Control Apparatus for Fixed Switching Speed
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Solution Overview
Problem
The existing power supply control apparatuses for batteries face challenges in maintaining a fixed switching speed from OFF to ON regardless of parasitic capacitor capacitance, leading to varying switching loss and electromagnetic wave frequency bands, and require frequent adjustments of components like resistors or capacitors for different loads, increasing development costs.
Innovation Solution
A power supply control apparatus with a semiconductor switch, a second semiconductor switch, a resistor, a diode, and a voltage output unit that maintains a fixed switching speed from OFF to ON by controlling the differential voltage between the semiconductor switch's control end and the output voltage, independent of parasitic capacitor capacitance, using a resistor and diode configuration to manage voltage thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a semiconductor switch is used to control power supply from a DC power supply to a load, then power supply control is achieved, but the switching speed varies depending on parasitic capacitor capacitance, causing varying switching loss and electromagnetic wave frequency bands
Solution Approach 1:
The voltage output unit pre-charges the parasitic capacitor before the semiconductor switch turns ON. By preparing the voltage in advance through the resistor and voltage output unit, the capacitor is already charged to the required level, enabling the switch to turn ON quickly without delay, thus maintaining consistent switching speed and reducing switching loss.
Solution Approach 2:
The invention dynamically adjusts the output voltage of the voltage output unit based on the required switching performance. By changing the voltage parameter output by the voltage output unit, the charging speed of the parasitic capacitor is optimized, ensuring consistent switching speed across different operating conditions and reducing switching loss.
2Speed
If component values like resistors or capacitors are adjusted for different loads to maintain fixed switching speed, then switching performance is optimized, but development costs increase due to frequent adjustments
Solution Approach 1:
The voltage output unit dynamically adjusts its output voltage based on the operating conditions and load requirements. This dynamic adjustment eliminates the need for manual component changes, as the system automatically adapts to different loads while maintaining consistent switching speed, thereby reducing development complexity and costs.
Solution Approach 2:
The system performs self-adjustment through the voltage output unit, which automatically modifies its output to maintain optimal switching performance. This self-service capability eliminates the need for external component adjustments for different loads, simplifying the development process and reducing costs.
3Speed
If the DC power supply continuously supplies large amounts of electric power to the parasitic capacitor, then the semiconductor switch can be quickly switched from OFF to ON, but the voltage at the control end may exceed the ON threshold prematurely
Solution Approach 1:
The voltage output unit incorporates feedback control to monitor the voltage at the control end of the semiconductor switch. Based on this feedback, the voltage output unit adjusts its output to charge the parasitic capacitor at the optimal rate, ensuring the voltage reaches the ON threshold at the right moment without exceeding it prematurely, thus maintaining both switching speed and control 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 configuration ensures a consistent switching speed from OFF to ON, reducing the need for frequent component adjustments and lowering development costs by stabilizing switching loss and electromagnetic wave frequency bands across varying loads.
Implementation Method 1
a diode having an anode connected to the control end of the semiconductor switch, and a cathode connected to the control end of the second semiconductor switch
Implementation Method 2
a resistor connected between one end of the power supply path on a current input side and the control end of the second semiconductor switch
Implementation Method 3
the DC power supply is connected to a control end of the semiconductor switch via a switch. When the semiconductor switch is switched from OFF to ON, the switch is switched from OFF to ON. Thus, electric power is supplied from the DC power supply to a parasitic capacitor with an end connected to the control end
Data Source
AI summary
In a power supply control apparatus, when a semiconductor switch is switched ON, a charging circuit increases a base voltage. A first switch is ON if a differential voltage obtained by subtracting a gate voltage from a base voltage is at least a first reference voltage, and is OFF if the differential voltage is smaller than the first reference voltage. If the first switch is ON, a battery or a capacitor charges parasitic capacitors of the semiconductor switch.