CN106291395A

CN106291395A - The loss phase undervoltage detection circuit of three-phase input power

Info

Publication number: CN106291395A
Application number: CN201510272315.6A
Authority: CN
Inventors: 巫昌圜; 王伟政; 罗吉胤
Original assignee: Hiwin Mikrosystem Corp
Current assignee: Hiwin Mikrosystem Corp; Hiwin Technologies Corp
Priority date: 2015-05-26
Filing date: 2015-05-26
Publication date: 2017-01-04

Abstract

The present invention provides the loss phase undervoltage detection circuit of a kind of three-phase input power, and it includes a half-wave rectifying circuit, a bleeder circuit, an optically coupled circuit and the digital signals processor sequentially connected.First with half-wave rectifying circuit by input power rectification, recycling divider resistance blood pressure lowering, and via the judgement signal of optically coupled circuit formation pulse wave form, calculate pulse wave by digital signals processor and be in the lasting time-histories of peak value to judge the loss phase situation of input power.The present invention can avoid the situation that electronic equipment is impaired because power supply is unstable.

Description

The loss phase undervoltage detection circuit of three-phase input power

Technical field

The present invention is relevant with circuit structure, the loss phase undervoltage detection circuit of a kind of three-phase input power.

Background technology

Pressing, electronic equipment needs the power supply receiving outside supply to start, but externally fed often has shakiness The problem of fixed situation, such as voltage instability or three phase mains loss phase, it will affect electronic equipment, even Cause damage, therefore have the prior art of some testing circuits to occur.

The first prior art is as disclosed by Chinese patent CN100403616, and input power is filtered by it After voltage and frequency be sampled, and be compared to judgment value with the value taken, to judge whether loss phase.The Two kinds of prior arts are as disclosed by Chinese patent CN102419400, and its detecting mode is by input power After filtered voltage, continuous sampling seven times, and compare the pressure reduction between each sub-sampling, in order to be confirmed whether Loss phase.But the sampling procedure of above two mode is the most complicated.

Third and fourth kind of prior art as disclosed by Chinese patent CN202710671 and CN203490298, It carries out the judgement of input power loss phase with three groups of optically coupled circuits, and has relatively costly doubt.And the 5th, Six kinds of prior arts are as disclosed by Chinese patent CN202111457 and CN203491679, and its needs make With six commutation diodes and a high-voltage electrolytic capacitor, in addition to relatively costly, the life-span of electrochemical capacitor Also it is the key factor considering cost.

The and for example loss phase detection mode disclosed by Chinese patent CN201707398 and CN101799520, its It is only capable of judging input power whether loss phase, does not possess the function that detecting is under-voltage.

Furthermore, Chinese patent CN203589705 discloses a kind of modular loss phase circuit for detecting, by fall Voltage rectifier, loss phase identification circuit, under-voltage protecting circuit and relay drive circuit control relay, with Reach protective effect.But this mode must utilize relay protecting system, and has the shortcoming that volume is bigger.

Summary of the invention

Present invention is primarily targeted at the loss phase undervoltage detection circuit providing a kind of three-phase input power, it will After three phase mains utilizes rectifies and utilizes divider resistance blood pressure lowering, then the work via optically coupled circuit Judge loss phase and under-voltage with sending signal for digital signals processor, it is to avoid electronic equipment is subject to because power supply shakiness Damage.

For reaching object defined above, the present invention by the following technical solutions:

A kind of loss phase undervoltage detection circuit of three-phase input power, it includes:

One half-wave rectifying circuit, it has three commutation diodes；

One bleeder circuit, after it is connected to half-wave rectifying circuit, in order to judge the voltage of input power；

One optically coupled circuit, it has two optical coupling detecting units；This optically coupled circuit is connected to this dividing potential drop After circuit, in order to form the judgement signal of pulse wave form；

One digital signals processor, after it is connected to this optically coupled circuit, in order to receive this judgement signal, It is in the lasting time-histories of peak value to judge the loss phase of input power by calculating pulse wave.

Judge two groups of input powers by described bleeder circuit and optical coupling detecting unit, if its voltage between Between 158V～413V, the most described bleeder circuit is judged as 220VAC；If its voltage between Between 413V～693V, the most described bleeder circuit is judged as 380VAC.

And the above-mentioned purpose of the present invention and advantage, the be not difficult detailed description from following selected embodiment and accompanying drawing In gain in-depth understanding.

Accompanying drawing explanation

Fig. 1 is the circuit framework schematic diagram of the present invention.

Fig. 2 is the loss phase testing process schematic diagram of the present invention.

Fig. 3 is the circuit framework schematic diagram of second embodiment of the invention.

Fig. 4 is the loss phase testing process schematic diagram of second embodiment of the invention.

Detailed description of the invention

Refer to Fig. 1, show the loss phase undervoltage detection circuit of three-phase input power provided by the present invention First embodiment, its include half-wave rectifying circuit 1, bleeder circuit 2, optically coupled circuit 3 and One digital signals processor 4.

Wherein, half-wave rectifying circuit 1 has three commutation diodes D1, D2, D3, for a three-phase electricity Stream L1, exports the waveform that its rectification is half waveshape after L2, L3 input.Bleeder circuit 2 is connected to After half-wave rectifying circuit 1, it forms with three divider resistance R1, R2, R3, the input electricity after rectification Source is in this blood pressure lowering, and judges its magnitude of voltage at this.

After optically coupled circuit 3 is connected to bleeder circuit 2, it has two optical coupling detecting unit U1, U2, in order to form the judgement signal of pulse wave form.Digital signals processor 4 is connected to optically coupled circuit 3 Afterwards, in order to receive this judgement signal, and by calculating the time-histories of pulse wave peak value to judge owing of input power Phase situation.

Collocation is referring to the testing process shown in Fig. 2, and the present embodiment, after by a three phase mains rectification, utilizes and divides Volt circuit 2 judges the magnitude of voltage after rectification, if the voltage after rectification is between 158V～413V, then sentences Break as 220VAC；If the voltage after rectification is between 413V～693V, then it is judged as 380VAC.

Then, after confirming the voltage of input power, according to the magnitude of voltage judged, optical coupling electricity is respectively enterd Optical coupling detecting unit U1, the U2 on road 3, to export the judgement signal of pulse wave form.This judgement signal is defeated After entering digital signals processor 4, this digital signals processor 4 calculates pulse wave and is in the lasting time-histories of peak value, And compare with built-in standard value, to detect this input power whether loss phase.Defeated with 220VAC/60Hz As a example by entering power supply, if pulse wave is in peak follow 1.6 milliseconds, then it is judged as without loss phase；If pulse wave has two kinds It is in the lasting time-histories (1.6 milliseconds and 7.2 milliseconds) of peak value, is then judged as owing a phase；If pulse wave is in peak Value continues 12.7 milliseconds, then be judged as owing biphase；If pulse wave is continuously in peak value, then it is judged as owing three-phase.

Above-mentioned testing result, if not being that then system there will be the warning message of loss phase, and limits without loss phase situation System operation electric current is until improving.If the loss phase state duration of input power is to exceeding setting value, then motor Will shut down, so as not to impaired.

The present invention also provides for second embodiment as shown in Figure 3, and it exists with the difference of above-mentioned first embodiment Circuit structure composed in bleeder circuit 2 '.In the present embodiment, bleeder circuit 2 ' is connected to halfwave rectifier electricity Between road 1 and optically coupled circuit 3, its with resistance R1～R4 connect composition, and three-phase current input and After rectified, judge magnitude of voltage via bleeder circuit 2 ', then according to the magnitude of voltage judged to select to drive Optical coupling detecting unit U1, U2 corresponding in optically coupled circuit 3, then the judgement news of output pulse wave form Number to digital signals processor 4, to judge the loss phase state of electric current.

Collocation is referring to the testing process shown in Fig. 4, and the present embodiment, after by a three phase mains rectification, utilizes and divides Volt circuit 2 ' judges the magnitude of voltage after rectification, if the voltage after rectification is between 158V～413V, then sentences Break as 220VAC；And if the voltage after rectification is between 413V～693V, then it is judged as 380VAC. Then pass through digital signals processor 4 to calculate pulse wave and be in the lasting time-histories of peak value, and with built-in standard value Relatively, this input power whether loss phase can be detected.

By described above, the present invention can complete input power with simple passive device and optically coupled circuit Loss phase and under-voltage detection function, and have that the number of components is less and lower-cost advantage.

But, the announcement of above example is in order to illustrate the present invention, and is not used to limit the present invention, therefore such as etc. The displacement of effect element must be subordinate to scope of the invention.

In sum, can make to know those skilled in the art and understand that the present invention really can reach object defined above, the most Meet the regulation of Patent Law, so file an application in accordance with the law.

Claims

1. the loss phase undervoltage detection circuit of three-phase input power, it is characterised in that include:

One half-wave rectifying circuit, it has three commutation diodes；

The loss phase undervoltage detection circuit of three-phase input power the most according to claim 1, its feature exists In, judge two groups of input powers by described bleeder circuit and optical coupling detecting unit, if its voltage between Between 158V～413V, the most described bleeder circuit is judged as 220VAC；If its voltage between Between 413V～693V, the most described bleeder circuit is judged as 380VAC.