Universal HVAC Controller Circuit for PWM and DC Motor Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
HVAC systems require different types of proportional control signals for variable-speed motors, leading to the need for dedicated circuitry and connectors on control boards, increasing costs and reducing flexibility.
Innovation Solution
A proportional control signal circuit (PCSC) that receives a pulse width modulated (PWM) signal and generates either a PWM or DC signal based on an integration signal, allowing a single controller to operate both types of motors without dedicated connectors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dedicated connectors and circuitry are provided for each type of variable-speed motor, then motor control reliability is improved, but device complexity and cost increase
Solution Approach 1:
The patent implements a universal controller that can operate with multiple types of variable-speed motors (PWM-controlled and DC-controlled) through a single output connector. The controller includes a proportional control signal circuit that can generate different types of control signals based on the connected motor type, eliminating the need for dedicated connectors and circuitry for each motor type while maintaining reliable control.
2Adaptability or versatility
If dedicated connectors are provided for different motor types, then motor control adaptability is improved, but manufacturing cost increases
Solution Approach 1:
The controller is designed with a universal output connector that can work with different motor types. The proportional control signal circuit automatically adapts to generate appropriate control signals (PWM or DC) based on the connected motor type, eliminating the need for multiple dedicated connectors and reducing manufacturing complexity and cost.
Solution Approach 2:
The controller changes its output signal parameters (from PWM to DC or vice versa) based on the detected motor type. This parameter adaptation allows a single connector design to serve multiple motor types, reducing manufacturing costs while maintaining versatility.
3Measurement precision
If multiple dedicated connectors are used, then control signal precision is improved, but ease of operation deteriorates
Solution Approach 1:
The universal output connector eliminates the need for users to determine which specific connector to use for different motor types. The controller automatically detects the motor type and provides the appropriate control signal through the single connector, simplifying installation while maintaining precise control through the adaptive proportional control signal circuit.
Data Source
AI summary
The disclosure provides a proportional control signal circuit (PCSC), an HVAC controller employing the same and an HVAC system including the HVAC controller. In one embodiment, the PCSC includes: (1) a signal input configured to receive a pulse width modulated signal, (2) a control input configured to receive an integration signal, (3) a signal output and (4) control circuitry, coupled to the signal input, the control input and the signal output, configured to provide either the pulse width modulated signal or a DC signal to the signal output based on the integration signal.