Switching Power Supply Compensation Circuit Reducing Silicon Area
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Solution Overview
Problem
Conventional compensation circuits in switching power supplies require large silicon chip areas due to large compensation capacitors, leading to increased production costs and complex circuit control.
Innovation Solution
A compensation circuit comprising a transconductance amplifier, a switching circuit, and a charging circuit, where the switching circuit is controlled by a switch control circuit to charge a compensation capacitor discontinuously, allowing for a reduced capacitor size without external connections, thus minimizing chip area and simplifying control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a large compensation capacitor is used in the conventional compensation circuit, then the control accuracy is maintained, but the silicon chip area occupied increases and production costs increase
Solution Approach 1:
The patent applies periodic action by using a switching circuit to charge and discharge the compensation capacitor in periodic pulses rather than maintaining a continuous large capacitor. The switch control circuit generates periodic control signals that cause the compensation capacitor to charge during specific intervals and discharge during others, achieving the same control effect with a much smaller capacitor size, thus reducing silicon chip area while maintaining control accuracy
Solution Approach 2:
The patent changes the operating parameters of the compensation circuit by introducing a switching mechanism that operates at high frequency. Instead of using a large capacitor with continuous charging, the system uses a smaller capacitor with periodic charging controlled by the switch control circuit. This parameter change allows the compensation function to be achieved with reduced capacitance value, thereby reducing the silicon chip area occupied
2Measurement precision
If a large compensation capacitor is used in the conventional compensation circuit, then the control accuracy is maintained, but the production costs increase
Solution Approach 1:
By implementing periodic charging and discharging of a smaller compensation capacitor through the switching circuit, the patent reduces the capacitor size required. This reduction in component size and value directly lowers production costs while the controlled periodic operation maintains the necessary control accuracy for the switching power supply
Solution Approach 2:
The patent changes the capacitance parameter from a large fixed value to a smaller value that is dynamically managed through switching control. This parameter change reduces the cost of the compensation capacitor and associated circuitry, making the power supply more cost-effective while preserving control performance through the switching mechanism
3Area of stationary object
If the compensation capacitor size is reduced, then the silicon chip area is reduced, but the control accuracy may be compromised
Solution Approach 1:
The patent incorporates feedback control through the switch control circuit that monitors the charging and discharging of the compensation capacitor. This feedback mechanism ensures that despite the reduced capacitor size, the control accuracy is maintained by dynamically adjusting the switching timing and duration to achieve the desired compensation effect, preventing any loss of control precision
Solution Approach 2:
The periodic switching action compensates for the reduced capacitor size by concentrating the charging current into specific time intervals. The switch control circuit regulates the periodic charging process to ensure that the compensation capacitor, though smaller, still provides sufficient compensation effect to maintain control accuracy in the switching power supply
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
This approach reduces the silicon chip area occupied by the compensation capacitor, decreases production costs, and maintains control accuracy by adjusting the transconductance coefficient, while eliminating the need for extra pins and simplifying circuit implementation.
Implementation Method 1
a transconductance amplifier configured to receive a reference signal and a feedback signal, and to generate an amplifier output signal according to a difference between the reference signal and the feedback signal
Implementation Method 2
a charging circuit coupled to the switching circuit, where the charging circuit is configured to be charged by the amplifier output signal in response to the control signal, and to generate a compensation signal therefrom
Data Source
AI summary
Disclosed are compensation circuits for a switching power supply. In one embodiment, a compensation circuit can include: (i) a transconductance amplifier configured to receive a reference signal and a feedback signal, and to generate an amplifier output signal according to a difference between the reference signal and the feedback signal; (ii) a switching circuit configured to receive the amplifier output signal, where the switching circuit is controllable by a control signal from a switch control circuit; and (iii) a charging circuit coupled to the switching circuit, where the charging circuit is configured to be charged by the amplifier output signal in response to the control signal, and to generate a compensation signal therefrom.