Pulse Generation Circuit for HVIC Abnormality Signal Transmission
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Solution Overview
Problem
Conventional high-voltage integrated circuits (HVICs) face challenges in distinguishing and transmitting different types of abnormality signals, such as overheat, overcurrent, and voltage drop, from the high-side circuit to the low-side circuit, due to the level-down circuit's inability to differentiate these signals effectively, leading to inadequate signal transmission when the high-side power supply voltage drops.
Innovation Solution
Incorporating a pulse generation circuit that detects voltage drops in the high-side circuit and adjusts the frequency of the pulse signal sent to the level-down circuit, thereby distinguishing and transmitting abnormality signals more effectively by modulating the pulse frequency and width based on the high-side power supply voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a level-down circuit is used to transmit abnormality signals from the high-side circuit to the low-side circuit, then abnormality notification is achieved, but the circuit cannot distinguish between different types of abnormality signals
Solution Approach 1:
The patent applies periodic action by using pulse signals with different duty ratios to represent different abnormality types. The pulse generation circuit generates periodic pulse signals where the duty ratio (ratio of pulse width to period) varies depending on the detected abnormality type, allowing the low-side circuit to distinguish between different abnormalities through duty cycle detection while maintaining reliable notification through the periodic pulse transmission mechanism.
2Loss of energy
If the high-side power supply voltage drops, then power consumption is reduced, but signal transmission to the low-side circuit becomes inadequate
Solution Approach 1:
The patent applies dynamics by making the pulse signal characteristics adaptive to the power supply voltage conditions. The pulse generation circuit dynamically adjusts the pulse width and duty ratio based on the detected high-side power supply voltage level. When voltage drops occur, the circuit generates pulses with higher duty ratios to ensure sufficient signal transmission capability while maintaining lower overall power consumption through intermittent operation of PMOS elements.
Solution Approach 2:
The patent applies parameter changes by varying the pulse signal parameters (width, frequency, duty ratio) according to the power supply voltage conditions. The pulse generation circuit changes these parameters dynamically to maintain signal transmission reliability across different voltage levels, ensuring that the low-side circuit can reliably detect abnormality signals even when the high-side power supply voltage drops.
3Reliability
If the level-down circuit operates continuously to ensure signal transmission, then communication reliability is maintained, but energy wastage increases
Solution Approach 1:
The patent applies periodic action by implementing intermittent operation of the PMOS elements in the level-down circuit. Instead of continuous operation, the circuit uses periodic pulse signals to transmit information, allowing the PMOS elements to switch on and off in sync with the pulse generation. This periodic operation maintains communication reliability during active transmission while significantly reducing energy consumption during idle periods.
Solution Approach 2:
The patent applies self-service by enabling the pulse generation circuit to automatically control the timing and duration of PMOS element operation. The circuit generates pulses only when abnormality detection is required, and the PMOS elements self-regulate their operation based on the pulse signal timing, eliminating the need for continuous monitoring or control while maintaining reliable communication when needed.
Data Source
AI summary
A semiconductor element drive apparatus for driving first and second semiconductor elements connected to a half-bridge circuit at respectively an upper-level side and a lower-level side of the half-bridge circuit. The semiconductor element drive apparatus includes a high-side circuit and a low-side circuit for respectively driving the first and second semiconductor elements. The high-side circuit includes a voltage drop detection unit that detects an abnormal voltage drop of a voltage of a main power supply, a pulse generation circuit that generates a pulse signal, a frequency of which is decreased in response to the abnormal voltage drop detected by the voltage drop detection unit, and a level-down circuit that receives the pulse signal from the pulse generation circuit, generates an abnormality signal, and transmits the abnormality signal to the low-side circuit, to thereby notify the low-side circuit of the abnormal voltage drop in the high-side circuit.