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Two-way direct current power supply circuit with overvoltage and undervoltage protection function and method

A protection function, overvoltage and undervoltage technology, applied in emergency protection circuit devices, protection against overvoltage, protection against undervoltage or no voltage, etc., can solve problems such as lack of pure hardware reliability

Inactive Publication Date: 2020-06-23
SHENZHEN ZIDOO TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has the following disadvantages: when the two power supplies are connected at the same time, it is not possible to arbitrarily designate which one is the main power supply, only the one with the higher voltage is the main power supply
However, this method has the following disadvantages: it is often necessary to add a single-chip microcomputer MCU to control, so that software development is required, and there is no high reliability of pure hardware

Method used

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  • Two-way direct current power supply circuit with overvoltage and undervoltage protection function and method
  • Two-way direct current power supply circuit with overvoltage and undervoltage protection function and method
  • Two-way direct current power supply circuit with overvoltage and undervoltage protection function and method

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Embodiment 1

[0040] see Figure 1 to Figure 3 . The present invention provides a two-way DC power supply circuit with overvoltage and undervoltage protection functions, including a first DC power supply 10, a second DC power supply 20, a first isolation circuit 30, a first MOS circuit 40, a voltage comparison circuit 50 and Switch control circuit 60; wherein, the first DC power supply is electrically connected to the first isolation circuit, and the first isolation circuit is used to isolate the first DC power supply and the second DC power supply; the first DC power supply, the second DC power supply The DC power supply is also electrically connected to the first MOS circuit respectively. When the first DC power supply is not powered on, the first MOS circuit is turned on, and the second DC power supply supplies power; when the first DC power supply is powered on, the first The MOS circuit is closed, and the first DC power supply supplies power; the first isolation circuit and the first ...

Embodiment 2

[0064] The circuit of the present invention can realize: in the case of 2-way DC power supply, under-voltage protection for 2-way power supply, and over-voltage protection for 2-way power supply at the same time, when the 2-way power supply is powered at the same time, the circuit of the present invention can also Designate one of the power supplies as the priority power supply; specifically:

[0065] The adapter power supply terminal isolation circuit uses a diode element to realize voltage isolation between POE and adapter.

[0066] The other power supply is controlled by using the first MOS tube circuit at the POE end. When the adapter is not powered on, the first MOS tube is turned on to use the POE power supply; when the adapter is powered on, the first MOS tube is turned off. The power supply of POE is disconnected, so that only the adapter can provide voltage power supply.

[0067] The DC-DC / LDO with a wide input voltage is used as the power supply and reference voltag...

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Abstract

The invention discloses a two-way direct-current power supply circuit with an overvoltage and undervoltage protection function. The two-way direct-current power supply circuit comprises a first direct-current power supply, a second direct-current power supply, a first isolation circuit, a first MOS circuit, a voltage comparison circuit and a switch control circuit. The first direct-current power supply is electrically connected with the first isolation circuit, the first direct-current power supply and the second direct-current power supply are also electrically connected with the first MOS circuit respectively, and the first isolation circuit and the first MOS circuit are electrically connected with the voltage comparison circuit. The voltage comparison circuit is electrically connected with the switch control circuit, the voltage comparison circuit outputs electric signals to the switch control circuit according to the states of the first direct-current power supply and the second direct-current power supply, and the switch control circuit controls opening and closing of the whole circuit according to the received electric signals. According to the invention, two-path direct current power supply can be realized, under-voltage protection and over-voltage protection functions are realized, one path can be preferably selected as a main power supply, and the circuit matched by adopting a pure hardware device method has higher reliability.

Description

technical field [0001] The invention relates to a product with POE and an adapter for simultaneous power supply, a battery-powered product and an adapter for simultaneous use, especially audio and video products, and in particular to a two-way DC power supply circuit and method with overvoltage and undervoltage protection functions. Background technique [0002] At present, some products integrate POE (Power Over Ethernet, active Ethernet) power supply, and then also need the adapter to supply power at the same time, and there will be two power supplies at the same time. [0003] In order to select one of the two power supplies, an existing method is: in a circuit with two DC power supplies, two diodes are used to directly isolate the two power supplies, so that two different DC power supplies can be connected. However, this method has the following disadvantages: when the two power supplies are connected at the same time, it is not possible to arbitrarily designate which on...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26H02H3/20H02H3/24H02J9/06
CPCH02H7/268H02H3/207H02H3/202H02H3/243H02J9/061
Inventor 余强
Owner SHENZHEN ZIDOO TECH CO LTD