Power supply voltage monitoring circuit of multi-power supply system

Abstract

The invention discloses a power supply voltage monitoring circuit of a multi-power supply system, and the power supply voltage monitoring circuit comprises a control and driving network, a first power supply output control network and a second power supply monitoring network, the control and driving network outputs a driving signal Vdr according to a feedback signal Vfb of the first power supply output control network and a signal of a key; the first power supply output control network controls the output of a first power supply V1 according to the signal of the Vdr and the working state of an optocoupler, and outputs the feedback signal Vfb; and the second power supply monitoring network monitors the voltage of a second power supply V2. The control and driving network, the first power supply output control network and the second power supply monitoring network realize closed loop of voltage monitoring of V2 and output control of V1. The power supply voltage monitoring circuit of the multi-power supply system is suitable for voltage monitoring application of a multi-power supply system, particularly suitable for voltage monitoring application of a multi-power supply system with positive and negative voltages, can be embedded into a hardware system of a whole machine, can also be independently used as a module, and is simple in circuit structure, low in cost and high in response speed.

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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