Drive Circuit Temperature Protection via Detection Diode
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Solution Overview
Problem
Current drive circuits lack effective protection mechanisms for drive chips against abnormal temperatures, which can lead to damage or burning due to internal failures or external high temperatures.
Innovation Solution
A drive circuit is designed with a detection diode, power supply circuit, acquisition circuit, detection circuit, and control circuit to monitor and control the drive chip's temperature, stopping the drive signal when temperatures exceed or fall below threshold values, thereby preventing damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If voltage or current protection mechanisms are implemented for the drive chip, then the drive chip is protected from voltage or current damage, but the drive chip remains vulnerable to temperature-related damage
Solution Approach 1:
A detection diode is introduced as an intermediary component to indirectly monitor the drive chip's temperature. The diode's voltage drop characteristics change with temperature, providing a temperature indicator without directly contacting or interfering with the drive chip's internal structure. This allows temperature protection without compromising the existing voltage/current protection mechanisms.
Solution Approach 2:
The patent replaces direct thermal sensing mechanisms with an electrical measurement approach. Instead of using physical temperature sensors that would add complexity, the system uses the electrical characteristics (voltage drop) of the detection diode to infer temperature, substituting mechanical/thermal detection with electrical measurement for simplicity and integration.
2Reliability
If temperature monitoring and protection mechanisms are added to the drive circuit, then the drive chip is protected from temperature damage, but the device complexity increases
Solution Approach 1:
The detection diode serves multiple functions: it acts as both a protection mechanism component and a temperature sensor. The same diode structure used for voltage/current protection is leveraged for temperature monitoring, eliminating the need for separate dedicated temperature sensing hardware and reducing overall circuit complexity.
Solution Approach 2:
The detection diode utilizes its own electrical characteristics (voltage drop) to provide temperature information. The diode's inherent temperature-dependent voltage drop is exploited as the sensing mechanism, requiring no additional active components or complex circuitry. The system uses the diode's self-characteristic to achieve both protection and monitoring functions.
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 effectively protects the drive chip from temperature-related damage by ensuring it operates only within normal temperature ranges, preventing overheating or underheating.
Implementation Method 1
a detection diode, included in the drive chip; a power supply circuit, configured to provide a constant power supply for the detection diode; an acquisition circuit, configured to acquire an electrical signal related to a voltage across the detection diode and a current flowing through the detection diode
Data Source
AI summary
A drive circuit and a display device are provided. A detection diode is included in a drive chip of the drive circuit. An acquisition circuit may acquire an electrical signal related to a voltage across the detection diode and a current flowing through the detection diode. A detection circuit may obtain an internal temperature of the drive chip based on the electrical signal acquired by the acquisition circuit. A control circuit may control the drive chip based on the internal temperature of the drive chip obtained by the detection circuit. When the detecting circuit detects that the internal temperature of the drive chip is greater than a maximum threshold temperature or less than a minimum threshold temperature, the acquisition circuit controls the drive chip to stop outputting a drive signal.