Control circuit, signal conversion circuit and control method
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Solution Overview
Problem
Current driver board circuits for compressors in applications like refrigerators consume significant standby power, especially when operating below a certain frequency threshold, as the microcontroller continues to operate even when the compressor stops, leading to inefficiencies.
Innovation Solution
A control circuit with an enable module that switches the microcontroller to a sleep state when the input signal frequency is below a predetermined threshold, reducing power consumption by disconnecting the power supply and preventing unnecessary operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the microcontroller continues to operate when the input signal frequency is below the threshold, then the control function is maintained, but the standby power consumption increases
Solution Approach 1:
The microcontroller's operational state is dynamically adjusted based on the input signal frequency. When frequency is below threshold, the controller enters sleep mode; when above threshold, it transitions to operational mode. This dynamic state change resolves the contradiction by adapting the controller's activity level to actual operational needs.
Solution Approach 2:
The patent changes the operational parameters of the microcontroller based on the input signal frequency parameter. By monitoring frequency and transitioning between sleep and operational states, the system optimizes power consumption while maintaining control reliability when needed.
2Use of energy by stationary object
If the microcontroller enters sleep state when frequency is below threshold, then power consumption is reduced, but the response time to resume operation increases
Solution Approach 1:
The system performs preliminary monitoring of the input signal frequency even in sleep state. The enable module continuously detects frequency conditions and prepares to activate the microcontroller immediately when the threshold is exceeded, eliminating startup delays while maintaining low power consumption during sub-threshold conditions.
3Speed
If the microcontroller operates continuously, then the control responsiveness is maintained, but the energy efficiency deteriorates
Solution Approach 1:
Instead of continuous operation, the microcontroller operates periodically based on input signal frequency conditions. The enable module periodically monitors frequency and triggers controller activation only when frequency exceeds the threshold, achieving energy-efficient periodic control rather than continuous operation.
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 reduces standby power consumption by ensuring the microcontroller only operates when the compressor is active, thereby minimizing energy usage during idle conditions.
Implementation Method 1
a voltage conversion unit, an enable terminal of the voltage conversion unit being connected to the output end of the switch unit so as to receive the enable signal, and an output terminal of the voltage conversion unit being connected to a power supply input terminal of the controller
Implementation Method 2
the charging/discharging loop comprises a first resistor and a first capacitor connected in series, wherein one end of the first resistor is connected to the input unit, and the first capacitor is connected between a control terminal of the switch unit and ground
Data Source
AI summary
A control circuit, a signal conversion circuit and a control method are disclosed. The control circuit includes a controller, which controls a load circuit according to a received input signal; and an enable module, which is connected to the controller and enables the controller on the basis of a frequency of the input signal, wherein the controller is caused to be in an operational state so as to control the load circuit according to the input signal when the frequency is higher than a predetermined threshold, and the controller is caused to be in a sleep state and thus not control the load circuit according to the input signal when the frequency is lower than the predetermined threshold.