Switched Capacitor Power Supply for Low-Bus-Voltage Actuation
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Solution Overview
Problem
Conventional power supply circuits for electromagnetic actuators in circuit breakers fail to reliably provide sufficient energy at low bus voltages, necessitating large-capacitance capacitors that occupy excessive space due to high voltage requirements.
Innovation Solution
A power supply circuit with a switching mechanism that controls the connection of a large-capacitance capacitor to the bus circuit based on voltage fluctuations, using a control circuit and switches to manage charging and discharging, allowing for a low-voltage withstanding capacitor with reduced size and increased reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large-capacitance capacitor is used to provide sufficient energy at low bus voltages, then the reliability of electromagnetic actuator actuation is improved, but the volume of the capacitor increases
Solution Approach 1:
The patent applies the dynamics principle by making the capacitor configuration changeable through switching mechanisms. The system dynamically reconfigures capacitor connections (series/parallel) based on bus voltage levels, allowing the same physical capacitors to provide different equivalent capacitances and voltage ratings. This enables large energy storage capability when needed while using smaller physical capacitors, thereby improving actuation reliability without proportionally increasing capacitor volume.
Solution Approach 2:
The patent changes the electrical parameters (capacitance and voltage rating) of the capacitor system by altering its connection configuration. By switching between series and parallel connections, the system changes the equivalent capacitance and voltage rating parameters dynamically. This allows the capacitor to adapt to different operating conditions, providing sufficient energy at low voltages while maintaining compact size through parameter transformation rather than physical size increase.
2Stability of the object's composition
If a large-capacitance capacitor is connected in parallel to the bus to stabilize voltage, then the bus voltage stability is improved, but the device complexity increases
Solution Approach 1:
The patent segments the capacitor system into multiple independent capacitor units that can be individually controlled and switched. Instead of using a single large capacitor or permanently connecting all capacitors in parallel, the system divides the energy storage function across multiple segments that can be independently managed. This segmentation allows for simplified control logic where switches connect or disconnect specific segments based on voltage conditions, stabilizing bus voltage while avoiding the complexity of continuously adjustable single-capacitor systems.
Solution Approach 2:
The patent implements periodic action through voltage-threshold-based switching control. The control system periodically monitors bus voltage and switches capacitor connections when voltage thresholds are exceeded or fallen below. This periodic monitoring and switching action maintains bus voltage stability within acceptable ranges without requiring continuous complex regulation, simplifying the overall control architecture while achieving stable voltage performance.
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 ensures reliable actuation of electromagnetic actuators at low bus voltages while significantly reducing the physical size of the capacitors required, optimizing space utilization in electrical devices.
Implementation Method 1
a first capacitor C1 connected in series with the first switch S1; a voltage sampling device 16 configured to detect a voltage of the first capacitor C1 and/or a power supply bus to which the power supply circuit is connected
Implementation Method 2
a voltage sampling device 16 configured to detect a voltage of the first capacitor C1 and/or a power supply bus to which the power supply circuit is connected
Implementation Method 3
an electromagnetic actuator, an electromagnetic actuation assembly can operate responsive to receiving a control instruction from a controller
Data Source
AI summary
The present disclosure relates to a power supply circuit and an electrical device. The power supply circuit includes: a first switch; a first capacitor connected in series with the first switch; a voltage sampling device configured to detect a voltage of the first capacitor and/or a power supply bus to which the power supply circuit is connected; and a control circuit configured to output a control signal based on the detected voltage, wherein the first switch is configured to be switched on or off based on the control signal. In this way, a low-voltage withstanding capacitor with a large capacitance can be achieved in the power supply circuit by switching out the capacitor when the power supply bus voltage is high and switching in the capacitor to assist in power supply when the power supply bus voltage is low.