Bypass Circuitry for On-Chip Voltage Regulator Heat Reduction
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Solution Overview
Problem
Driver circuits for external power switches generate significant heat due to power losses in voltage regulators, necessitating additional heat sinks that increase size and cost.
Innovation Solution
The integration of bypass circuitry external to the driver circuit offloads power dissipation from the voltage regulator, using bypass resistors and diodes to redirect current and reduce heat generation within the driver circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a voltage regulator is used to generate logic voltage from supply voltage in the driver circuit, then the logic components can operate with stable voltage, but significant heat is generated in the voltage regulator requiring additional heat sinks
Solution Approach 1:
The patent extracts the power dissipation function from the integrated driver circuit by introducing an external bypass circuit. The bypass circuit comprises a bypass resistor connected in parallel with the voltage regulator, allowing excess current to flow externally where heat can be dissipated without affecting the integrated circuit's thermal constraints.
Solution Approach 2:
The bypass resistor acts as an intermediary element that mediates between the voltage regulator and ground. It provides an alternative current path that carries the difference between the regulator current and the logic component current, effectively transferring the heat generation function to an external component.
2Temperature
If additional heat sinks are added to dissipate heat from the voltage regulator, then thermal constraints are managed, but the size and cost of the driver circuit increase
Solution Approach 1:
The patent removes the heat dissipation requirement from the integrated driver circuit package by extracting the power dissipation function to an external bypass circuit. This eliminates the need for additional heat sinks within the driver circuit package, maintaining compact size and reducing package costs.
Solution Approach 2:
The bypass resistor is implemented as a simple, inexpensive external component that can be easily replaced if needed. This approach is more cost-effective than integrating complex thermal management solutions into the driver circuit package.
3Temperature
If bypass circuitry is used to offload power dissipation externally, then heat generation in the driver circuit is reduced, but the circuit arrangement becomes more complex
Solution Approach 1:
The patent segments the power dissipation function from the driver circuit functionality. The bypass circuit is designed as a separate, simple module with just a resistor and optionally a diode, making the added complexity minimal and localized to an external component rather than integrated into the driver circuit.
Solution Approach 2:
The bypass circuit is applied locally at specific points in the circuit where current diversion is needed. The bypass resistor is connected in parallel with the voltage regulator, creating a localized current division that precisely targets the heat generation issue without affecting other parts of the driver circuit.
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 approach eliminates the need for additional heat sinks, reducing thermal constraints and costs while maintaining efficient power delivery to logic components, thereby enhancing the cost-effectiveness of the driver circuit.
Implementation Method 1
the bypass circuitry is configured to offload power dissipation from the driver circuit to the bypass circuitry
Implementation Method 2
using bypass resistors and diodes to redirect current
Data Source
Figure 1
Figure 2~3
AI summary
The present document relates to the reduction of heat generated within an integrated circuit. In particular, the present document relates to the reduction of heat generated in driver circuits comprising voltage regulators. A circuit arrangement (100, 200) is described. The circuit arrangement (110, 200) comprises a driver circuit (110, 210) configured to generate a control signal for driving a power switch (105, 205). The driver circuit (110, 210) comprises a voltage regulator (114) configured to generate a second voltage from a supply voltage; a drive unit (116, 216) configured to generate the control signal based on the supply voltage and configured to provide the control signal to a control interface (112, 212) of the driver circuit (110, 210); and a logic component (115, 215) operating at the second voltage and drawing a second current, and configured to control the drive unit (116, 216). Furthermore, the circuit arrangement (100, 200) comprises bypass circuitry (120, 220) coupled at an input to the control interface (112, 212) and configured to provide at an output at least part of the second current to the logic component (115, 215).