切换式电源转换器电路
By employing a ramp signal generation mechanism independent of input voltage in the switching power converter, the output voltage changes are dynamically adapted, solving the problems of insufficient stability and poor load transient response performance in the prior art, and achieving high efficiency, stability and fast response of the system.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- POWERX SEMICONDUCTOR CORPORATION
- Filing Date
- 2025-07-31
- Publication Date
- 2026-07-17
AI Technical Summary
Existing switching power converters in COT control architecture are sensitive to input voltage, resulting in insufficient stability. Especially under high output voltage and dynamic load conditions, the Q value is abnormal, affecting the load transient response performance and increasing circuit complexity and power consumption.
A ramp signal generation mechanism independent of input voltage is adopted. The first and second circuit modules generate a first signal component and a second signal component that are not affected by the input voltage, respectively. These components are combined with the DC component signal to form a ramp signal, which dynamically adapts to changes in output voltage and maintains the stability of the control loop and the transient response performance of the load.
It improves system stability, maintains a reasonable Q value range, reduces circuit complexity and power consumption, and enhances load transient response performance, making it suitable for high-performance applications such as mobile devices and processor power supply.
Smart Images
Figure CN224520919U_ABST
Abstract
Claims
1. A switched power converter circuit, comprising: Include: A power supply stage circuit is used to generate an output voltage from an output terminal based on an input voltage; A control circuit, coupled to the power stage circuit, is used to generate a control signal based on a ramp signal and a DC component signal to control the power stage circuit. A ramp signal generator, coupled to the output terminal of the control circuit and the power supply stage circuit, is used to generate the ramp signal. The ramp signal generator includes: A first circuit module is configured to generate a first current based on the output voltage and a working cycle of the control signal, the first current charging or discharging an energy storage unit to determine a first signal component of the ramp signal; and A second circuit module is used to convert the output voltage into a second signal component of the ramp signal; and A DC acquisition module is used to receive the output voltage and acquire the DC component of the output voltage to generate the DC component signal.
2. The switched power converter circuit of claim 1, wherein, The first circuit module includes: A current source is used to generate the first current based on the output voltage; A switching element is coupled between the current source and the control circuit to control the conduction state of the current source to the control circuit according to the working cycle of the control signal. as well as The energy storage unit has one end coupled between the switching element and the control circuit, and the other end coupled to a ground terminal or the output terminal.
3. The switched power converter circuit of claim 2, wherein, The current source is an active current source that converts the output voltage into the first current according to a conversion factor.
4. The switched power converter circuit of claim 2, wherein, The current source is a resistor, and the resistor is coupled between the output terminal and the switching element.
5. The switched power converter circuit of claim 1, wherein, The energy storage unit includes a capacitor or includes a capacitor and a resistor connected in series.
6. The switched power converter circuit of claim 1, wherein, The second circuit module is a resistor, one end of which is coupled to the output terminal, and the other end is coupled to the first circuit module and the control circuit.
7. The switched power converter circuit of claim 1, wherein, The control circuit includes: An on-time generator, coupled to the power stage circuit, is used to generate the control signal based on a comparison result; and A comparator, coupled to the first circuit module, the second circuit module, the DC acquisition module, and a reference voltage, is used to compare the sum of the first signal component, the second signal component, and the DC component signal of the ramp signal with the reference voltage, or to compare the sum of the first signal component and the second signal component of the ramp signal with the DC component signal, so as to generate the comparison result.
8. The switched power converter circuit of claim 7, wherein, The DC acquisition module includes: An error amplifier is used to compare the output voltage with the reference voltage to produce an error result; The DC acquisition module generates the DC component signal based on the error result and outputs the DC component signal to the comparator.
9. The switching power converter circuit as described in claim 1, characterized in that, The first circuit module does not receive the input voltage to determine the first signal component of the ramp signal.
10. The switched power converter circuit of claim 1, wherein, The first current is proportional to the output voltage and the duty cycle.