Compensation Circuit for Constant Output Voltage Precision
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Solution Overview
Problem
Existing compensation circuits for constant output voltage in power management integrated circuits face challenges in maintaining precision and efficiency, particularly in reducing standby power dissipation and accommodating variations in input voltage, leading to increased static error and power loss.
Innovation Solution
A compensation circuit comprising a current source, controllable current source, logic NOT gate, CV loop control module, and input voltage detection module, which regulates the compensation current based on the control voltage and switching frequency to adjust the feedback voltage and output voltage, ensuring precise constant output voltage and minimizing power dissipation by changing the flow direction of the compensation current at different load intervals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a compensation circuit is used to improve output voltage precision, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The compensation circuit automatically adjusts the feedback voltage based on the control voltage from the error amplifier, without requiring external intervention or complex control logic. The controllable current source self-regulates to compensate for voltage drops, making the system self-correcting and reducing the need for additional complex control mechanisms.
Solution Approach 2:
The circuit changes the feedback voltage parameter dynamically based on the control voltage level. By adjusting the feedback voltage in response to load changes (represented by control voltage variations), the system maintains precise output voltage without requiring a completely complex control architecture.
2Manufacturing precision
If compensation current is increased to reduce static error, then manufacturing precision is improved, but power loss increases
Solution Approach 1:
The compensation current is made dynamic rather than static. The controllable current source adjusts its output current based on the control voltage, which varies with load conditions. This dynamic adjustment ensures that compensation current is optimized for each operating point, reducing unnecessary power dissipation while maintaining voltage precision.
Solution Approach 2:
The circuit changes the compensation current parameter in response to varying load conditions. By monitoring the control voltage and adjusting the compensation current accordingly, the system maintains precise voltage regulation while minimizing power loss across different operating points.
3Use of energy by moving object
If the flow direction of compensation current is changed to reduce standby power dissipation, then use of energy is improved, but device complexity increases
Solution Approach 1:
The compensation current flow direction is periodically adjusted based on operating conditions. During standby or light-load conditions, the circuit reverses or reduces the compensation current flow to minimize power dissipation. This periodic adjustment is automatically controlled by the relationship between control voltage and compensation current, without requiring complex switching control logic.
Solution Approach 2:
The circuit automatically determines when to reverse or reduce compensation current flow based on the control voltage level. The controllable current source self-regulates its current direction and magnitude in response to load conditions, eliminating the need for external control signals or complex switching mechanisms.
Data Source
AI summary
A compensation circuit for constant output voltage is disclosed. The compensation circuit comprises a current source, a first switch, a controllable current source, a second switch, a logic NOT gate, a CV loop control module, and an input voltage detection module. The compensation circuit ensures a normal start-up, and substantially no additional power dissipation of the converter is generated at no load. Furthermore, the compensation circuit adjusts a compensation current according to at least one of a detected input voltage of the power supply converter and a working mode of the transformer, to obtain better precision of constant output voltage. The compensation circuit can be applied to occasions where extremely small standby input power dissipation or extremely high precision of constant output voltage is required.