Power Supply Voltage Monitoring Circuit for Multiple Power Supply Systems

Abstract

The invention discloses a power supply voltage monitoring circuit of a multi-power supply system, which includes a control and drive network, a first power supply output control network and a second power supply monitoring network. The control and drive network is based on the feedback signal Vfb of the first power supply output control network, and the signal of the button key, and output the driving signal Vdr; the first power supply output control network controls the output of the first power supply V1 according to the signal of Vdr and the working state of the optocoupler, and outputs the feedback signal Vfb; the second power supply monitoring network realizes the control of the second Voltage monitoring of power supply V2. The control and driving network, the first power output control network and the second power monitoring network realize the closed loop of voltage monitoring of V2 and output control of V1. The present invention is suitable for voltage monitoring applications in multi-power supply systems, especially for voltage monitoring applications in multi-power supply systems with positive and negative voltages. It can be embedded in the hardware system of the whole machine, or can be used independently as a module. The circuit structure is simple and the cost is low. quick response.

Description

technical field [0001] The invention relates to a power supply voltage monitoring circuit, in particular to a power supply voltage monitoring circuit of a multi-power supply system. Background technique [0002] The electronic information industry is an important industry related to the development of the national economy. Electronic equipment has higher and higher requirements for stability and reliability. In many electronic systems, there are multiple working power supplies, and even multiple positive and negative voltage power supplies. In these In a multi-power supply system, there are often strict requirements on the power-on and power-off sequence of each power supply. For example, in some +5V and -48V working systems, it is required that after the -48V is powered off, the +5V must be powered off immediately, otherwise there will be a risk of damaging the system. [0003] For electronic systems with multiple working power supplies that require power-on and power-off ...

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Problems solved by technology

[0003] For electronic systems with multiple working power supplies that require power-on and power-on sequences, the commonly used voltage monitoring methods in the industry are resistor dividers, comparators, programmable device MCUs, etc., which are more suitable for systems with multiple positive voltage power supplies. , for a system with multiple positive and negative voltage power supplies, the design is more complicated, the cost is higher, and it is not easy to be used independently as a module; on the other hand, the programmable device MCU has a certain response delay, and its response speed cannot be compared with high-speed hardware circuit compared to

[0004] Therefore, at present, for electronic systems with multiple working power supplies, especially electronic systems with positive and negative voltage power supplies at the same time, and electronic systems that have power-on and power-on timing requirements for each power supply, there is no better power supply voltage monitoring method, which cannot meet the high requirements of the electronic system. reliability requirements

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