Dynamic power supply system capable of changing operating power with input signal

Abstract

The invention relates to a dynamic power supply system capable of changing operating power with an input signal. The dynamic power supply system comprises a signal input circuit, two power supply control circuits and a voltage follower circuit. Each of the power supply control circuits is electrically connected to the signal input circuit and the voltage follower circuit. The power supply controlcircuits output different operating power signals to the voltage follower circuit according to different input voltage signals received from the signal input circuit, so that the dynamic power supplysystem of the invention can generate a corresponding dynamic operating power range based on different input voltage signals to achieve an effect of dynamically changing the operating power. Thus, thevoltage follower circuit can be replaced according to requirements without being limited by the input voltage signal, thereby achieving a purpose of improving circuit characteristics.

Description

technical field [0001] The invention relates to a power supply system, in particular to a dynamic power supply system which can change the working power according to the input signal. Background technique [0002] A traditional voltage follower circuit (Voltage follower circuit) includes an operational amplifier (Operational Amplifier, OP, OPA, hereinafter referred to as OPA). Through the OPA and its circuit connection relationship, the output voltage signal of the OPA is equal to the input voltage signal. This can be applied to power systems that require the output voltage to be equal to the input voltage. [0003] At present, there are OPAs with different specifications on the market, including offset voltage (Voltage Offset, Vos, hereinafter referred to as Vos), input bias current (Input Bias Current, Ib, hereinafter referred to as Ib), offset drift voltage (Voltage Offset drift, Vos drift, hereinafter Referred to as Vos drift) and operating power range, limited by the i...

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Problems solved by technology

[0003] At present, there are OPAs with different specifications on the market, including offset voltage (Voltage Offset, Vos, hereinafter referred to as Vos), input bias current (Input Bias Current, Ib, hereinafter referred to as Ib), offset drift voltage (Voltage Offset drift, Vos drift, hereinafter Referred to as Vos drift) and operating power range, limited by the influence of OPA specifications, OPA with good characteristics generally has a small operating power range (such as ±5.5V), when using a large input voltage signal, it is impossible to choose a small operating power specification OPA with better characteristics causes the circuit characteristics of the voltage follower circuit to fail to improve

[0004] When choosing an OPA with better characteristics and specifications, it usually has a small operating power supply range and can only operate in a small input voltage range. The input voltage operating range is limited by the common-mode voltage (Common-Mode Voltage, V CM ) specification characteristics, when the input voltage signal exceeds the common-mode voltage, the output voltage of the OPA will not reach the voltage following point, and when the input voltage signal exceeds the working power supply, the input voltage signal will enter the voltage limit state

[0005] When the input voltage signal of the OPA requires a signal with a large voltage operating range, it is necessary to select an OPA with a large operating power range, but the OPA with a large operating power range generally has poor (high) Vos characteristics, poor (high) Ib, characteristics and poor (high) Vos drift characteristics, in the selection of components, the specifications are limited by adapting to the component specifications

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