Voltage adjustable power supply system

Abstract

The invention relates to the technical field of electric power and particularly discloses a voltage adjustable power supply system which comprises a superior power supply, a first direct-current step-down transformer, a plurality of linear voltage stabilizers, acquirers and a controller, wherein the acquirers are respectively connected with the linear voltage stabilizers and are used for acquiringelectric signals output from the linear voltage stabilizers and used for generating acquired signals which are combined corresponding to different situations of the electric signals output from the linear voltage stabilizers; the controller is connected with the acquirers and is used for receiving, generating and outputting a control signal according to the acquired signals; the first direct-current step-down transformer comprises a control input end; the control input end is connected with the controller and is used for receiving and adjusting a first preset voltage according to the controlsignal; the voltage value of the adjusted first preset voltage is the maximum value of rated working voltages of the linear voltage stabilizers operated in real time. Due to the adoption of the system, power consumption of the power supply system can be reduced, and thus the service life of the power supply system can be prolonged.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to an adjustable voltage power supply system. Background technique [0002] Linear regulators use transistors or FETs operating in their linear region to subtract excess voltage from the applied input voltage to produce a regulated output voltage. Its products provide excellent performance in small packages, and provide value-added features such as thermal overload protection, safety current limit, and shutdown mode can greatly reduce power consumption. [0003] However, in some power systems, linear regulators with different rated operating voltages may be used, and these linear regulators need to share the same DC buck, so the traditional method is to output the voltage of the DC buck The value is maintained at a constant value high enough, which will cause the output voltage of the DC buck to remain at a high value even when only a small number of linear regulators wit...

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Problems solved by technology

[0003] However, in some power systems, linear regulators with different rated operating voltages may be used, and these linear regulators need to share the same DC buck, so the traditional method is to output the voltage of the DC buck The value is maintained at a constant value high enough, which will cause the output voltage of the DC buck to remain at a high value even when only a small number of linear regulators with a small rated operating voltage are operating, resulting in a loss of power consumption Waste, in severe cases, will damage the circuit, resulting in reduced circuit life

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