CN205304388U

CN205304388U - Detection circuit

Info

Publication number: CN205304388U
Application number: CN201521100120.5U
Authority: CN
Inventors: 朱海东; 仇军
Original assignee: Suzhou Mai Li Electrical Appliances Co Ltd
Current assignee: Suzhou Mai Li Electrical Appliances Co Ltd
Priority date: 2015-12-25
Filing date: 2015-12-25
Publication date: 2016-06-08
Anticipated expiration: 2025-12-25

Abstract

The utility model relates to a detection circuit, including two voltage comparater integrated circuit U3 and a parallelly connected optoelectronic coupler U1 and the 2nd optoelectronic coupler U2, wherein, an optoelectronic coupler U1's 1 foot is connected with first electric capacity C1, 2 feet and is connected with first resistance R1, and the 2nd optoelectronic coupler U2's 1 foot is connected with second electric capacity C2, 2 feet are connected with second resistance R2, and an optoelectronic coupler U1 and the 2nd optoelectronic coupler U2's 4 feet pass through third electric capacity C3 ground connection, an optoelectronic coupler U1 and the 2nd optoelectronic coupler U2's 3 feet pass through a RC parallel circuit ground connection with two voltage comparater integrated circuit U3's an input. The utility model discloses a detection circuit detects the commercial power state to the switching of load power supply be can carry out according to the testing result, dependable performance and simple structure, with low costs are makeed.

Description

A kind of testing circuit

Technical field

This utility model relates to civil power inversion handoff technique, particularly relates to a kind of testing circuit in civil power inversion switching.

Background technology

Uninterrupted power source (UninterruptiblePowerSystem/UninterruptiblePowerSupply, it is called for short UPS) it is that accumulator is connected with main frame, by modular circuits such as main frame inverters by the system equipment of converting direct-current power into alternating-current power. It is mainly used in providing stable, continual supply of electric power to single computer, computer network system or other power electronic equipment such as electromagnetic valve, pressure transmitter etc.

UPS generally includes accumulator, storage battery charge controller, inverter, civil power inversion switch controller, when, after civil power power-off, by civil power inversion switch controller, inverter being outputted to load supplying end, for load supplying. Civil power inversion switch controller structure complexity on the market, relatively costly at present, and reliability is low.

Utility model content

The purpose of this utility model is in that to provide a kind of testing circuit, switches for civil power inversion, to solve the problem of civil power inversion switching poor reliability in prior art.

This utility model provides a kind of testing circuit, including twin voltage comparator integrated circuit U3 and the first photoelectrical coupler U1 in parallel and the second photoelectrical coupler U2, wherein, 1 foot of the first photoelectrical coupler U1 is connected to the first electric capacity C1,2 feet are connected to the first resistance R1,1 foot of the second photoelectrical coupler U2 is connected to the second electric capacity C2,2 feet are connected to the second resistance R2, and 4 feet of the first photoelectrical coupler U1 and the second photoelectrical coupler U2 pass through the 3rd electric capacity C3 ground connection; One input of 3 feet of the first photoelectrical coupler U1 and the second photoelectrical coupler U2 and twin voltage comparator integrated circuit U3 is by a RC parallel circuit ground connection.

Further, another input of twin voltage comparator integrated circuit U3 passes through the 2nd RC parallel circuit ground connection, and is connected by the 3rd resistance R3 and 5V voltage; The outfan of twin voltage comparator integrated circuit U3 is connected by the 4th resistance R4 and 5V voltage, and by the 5th resistance R5 and external connection.

Adopting above-mentioned technical solutions of the utility model to provide the benefit that: by testing circuit, city's electricity condition to be detected, such that it is able to carry out the switching of load supplying according to testing result so that dependable performance, and simple in construction, cost are low.

Accompanying drawing explanation

Fig. 1 is the electrical block diagram of a kind of testing circuit of the present utility model;

Fig. 2 is the application schematic diagram of a kind of testing circuit of the present utility model.

Detailed description of the invention

For making the purpose of this utility model embodiment, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in this utility model embodiment, technical scheme in this utility model embodiment is clearly and completely described, obviously, described embodiment is a part of embodiment of this utility model, rather than whole embodiments.

The utility model discloses a kind of testing circuit, this testing circuit is for civil power inversion switching, as shown in Figure 1, this testing circuit includes twin voltage comparator integrated circuit U3 and the first photoelectrical coupler U1 in parallel and the second photoelectrical coupler U2, wherein, 1 foot of the first photoelectrical coupler U1 is connected to the first electric capacity C1,2 feet are connected to the first resistance R1,1 foot of the second photoelectrical coupler U2 is connected to the second electric capacity C2,2 feet are connected to the second resistance R2, and 4 feet of the first photoelectrical coupler U1 and the second photoelectrical coupler U2 pass through the 3rd electric capacity C3 ground connection; One input of 3 feet of the first photoelectrical coupler U1 and the second photoelectrical coupler U2 and twin voltage comparator integrated circuit U3 is by a RC parallel circuit (circuit being made up of R11, C11) ground connection. Another input of twin voltage comparator integrated circuit U3 passes through the 2nd RC parallel circuit (circuit being made up of R22, C22) ground connection, and is connected by the 3rd resistance R3 and 5V voltage; The outfan of twin voltage comparator integrated circuit U3 is connected by the 4th resistance R4 and 5V voltage, and by the 5th resistance R5 and external connection.

Fig. 2 is the application schematic diagram of a kind of testing circuit of the present utility model, as in figure 2 it is shown, in the present embodiment, AC_IN connects mains electricity input end, and inverter connects inverter output end, and ACOUT is loading interfaces, P5, P6 are power input interface, and P4 is that inverter output controls interface, civil power input (P1) contact relay normally-closed contact (K1_2, K2_2), inverter exports (P2) relay termination normally opened contact (K1_3, K2_3), power detection circuit detection city of city electricity condition, when civil power is normal, positive half cycle voltage AC_IN_L returns to AC_IN_N through C2, R2, conducting light Rhizoma Nelumbinis U2, + 5V voltage arrives U32 foot through light Rhizoma Nelumbinis U2, and now U32 foot is high level, and U32 foot voltage is higher than U33 foot voltage, U31 foot output high level, this signal is sent to Micro-processor MCV detection port, negative half period voltage AC_IN_N is through C1, light Rhizoma Nelumbinis U11 foot, 2 feet, R1 returns to AC_IN_L, conducting light Rhizoma Nelumbinis U1, + 5V voltage arrives U32 foot through light Rhizoma Nelumbinis U1, now U32 foot is high level, U32 foot voltage is higher than U33 foot voltage, U31 foot output high level, this signal is sent to Micro-processor MCV detection port, after microprocessor accepts information, microprocessor sets low I/0 foot, 2 feet, audion Q1 is not turned on, relay K 1, K2 is switched to normally-closed contact, civil power AC_IN_L passes through relay K 1 normally-closed contact 2, 1 foot arrives AC_L, civil power AC_IN_N passes through relay K 2 normally-closed contact 2, 1 foot arrives AC_N, realizing civil power is load supplying, complete inversion to switch to civil power. assignment 19 foot is high level simultaneously, and this high level, through R8,1 foot of light Rhizoma Nelumbinis U4,2 feet, turns on light Rhizoma Nelumbinis U4, thereby through P4 port controlling inverter duty, forbids that inverter exports.When civil power power-off, light Rhizoma Nelumbinis U1, U2 is in not on-state, now 2 feet of U3 are low level, the level of 3 feet of U3 is higher than the level of 2 feet, thus the 1 foot output low level of U3, this signal is sent to MCU and detects port, after microprocessor accepts information, set high I/0 foot, 2 feet, audion Q1 turns on, relay K 1, K2 is switched to normally opened contact, inversion output INV_L is by relay K 1 normally opened contact 3, 1 foot arrives AC_L, inversion output INV_N is by relay K 2 normally opened contact 3, 1 foot arrives AC_N, realize inversion and be output as load supplying, complete civil power to switch to inversion.

A kind of testing circuit that this utility model provides is by detecting city's electricity condition, such that it is able to carry out the switching of load supplying according to testing result so that dependable performance, and simple in construction, cost are low.

Last it is noted that various embodiments above is only in order to illustrate the technical solution of the utility model, it is not intended to limit; Although this utility model being described in detail with reference to foregoing embodiments, it will be understood by those within the art that: the technical scheme described in foregoing embodiments still can be modified by it, or wherein some or all of technical characteristic is carried out equivalent replacement; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the scope of each embodiment technical scheme of this utility model.

Claims

1. a testing circuit, it is characterized in that, the first photoelectrical coupler and the second photoelectrical coupler including twin voltage comparator integrated circuit and parallel connection, 1 foot of described first photoelectrical coupler is connected to the first electric capacity, 2 feet are connected to the first resistance, 1 foot of described second photoelectrical coupler is connected to the second electric capacity, 2 feet are connected to the second resistance, and 4 feet of described first photoelectrical coupler and the second photoelectrical coupler pass through the 3rd capacity earth; One input of 3 feet of described first photoelectrical coupler and the second photoelectrical coupler and described twin voltage comparator integrated circuit is by a RC parallel circuit ground connection.

2. a kind of testing circuit according to claim 1, it is characterised in that another input of described twin voltage comparator integrated circuit passes through the 2nd RC parallel circuit ground connection, and is connected with 5V voltage by the 3rd resistance; The outfan of described twin voltage comparator integrated circuit is connected with 5V voltage by the 4th resistance, and by the 5th resistance and external connection.