CN105572523A - AC detection circuit - Google Patents
AC detection circuit Download PDFInfo
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- CN105572523A CN105572523A CN201410529678.9A CN201410529678A CN105572523A CN 105572523 A CN105572523 A CN 105572523A CN 201410529678 A CN201410529678 A CN 201410529678A CN 105572523 A CN105572523 A CN 105572523A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
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Abstract
The invention provides an AC detection circuit. The AC detection circuit is characterized in that a first current-limiting resistor used for connection with an AC live wire is provided; an optical coupler is used for connection with an AC zero wire, and is connected with a first current-limiting resistor; a second current-limiting resistor and a first capacitor are connected with the optical coupler; the other end of the second current-limiting resistor is connected with an anode of a logical power supply, and the other end of the first capacitor is connected with the grounding end of the logic power supply, and is connected with an output end used for connection with a load element; during the normal working of the AC, the output end is used to output DC high level; during the cut-off of the optical coupler caused by the power off or the default phase of the AC, the output end is used to output DC low level. The AC detection circuit is advantageous in that the problems such as misjudgement of the possible power off state of the system or the detection of the accidental default phase state of the three-phase AC can be solved; the circuit structure is simple, the occupied system resource is less, the costs are low, and the reliability is high.
Description
Technical field
The present invention relates to electric and electronic technical field, particularly relate to a kind of testing circuit of alternating current.
Background technology
Configuring in the AC-DC module or other system being provided with accumulator, the unscheduled events such as ac main circuit sky cut-offs out may allow system be mistaken for and exchange and have a power failure, the system decision-making is caused to be slipped up, influential system safe operation, therefore need the state-detection of carrying out alternating current at ac power input end subsidiary loop, thus judge whether that real interchange has a power failure.
It is carry out alternating voltage detection based on transformer that the method that can be used in realizing AC outage status detection function at present mainly contains two kinds: one, and two is carry out three-phase alternating current pile defection based on direct current optocoupler.The former is the isolation and the no-load voltage ratio that utilize transformer, exports and obtains ac small signal, through ADC conversion, carrys out real-time output AC voltage value, needs analog quantity to detect.The latter is the isolation and the transfer ratio that utilize direct current optocoupler, exports half-wave pulse signal, judges the state of three-phase alternating current, needs to use pulse width and detects and frequency detecting technology, or builds comparer and obtain judged result according to reference level value.
Knowing scene with presence or absence of AC-powered state for only needing, all there is circuit structure complexity, takies the shortcoming that systems axiol-ogy resource is many, reliability is low, cost is high in above-mentioned two kinds of existing detection schemes.Therefore, the testing circuit of a kind of simple and flexible, cost are low, reliability is high alternating current is provided to provide.
Summary of the invention
In order to overcome the above-mentioned problems in the prior art, the invention provides a kind of testing circuit of alternating current, the power down mode erroneous judgement that the system that solves is possible, or the problem that the unexpected non-full-phase state of three-phase alternating current detects, simplify the structure simultaneously, reduce the cost of testing circuit.
In order to solve the problems of the technologies described above, the present invention adopts following technical scheme:
According to an aspect of the embodiment of the present invention, provide a kind of testing circuit of alternating current, comprising:
For the first current-limiting resistance be connected with interchange live wire;
For being connected with interchange zero line, and the optocoupler be connected with described first current-limiting resistance;
The second current-limiting resistance be connected with described optocoupler and the first electric capacity, the other end of described second current-limiting resistance connects the positive pole of a logic power, the described other end of the first electric capacity is connected with the earth terminal of logic power, and connects for the output terminal be connected with load elements with one;
Wherein, when described alternating current normally works, described output terminal exports a direct current high level;
When described AC outage or phase shortage make described optocoupler end, described output terminal exports a direct current low level.
Wherein, the testing circuit of this alternating current also comprises: a load elements, and described load elements is connected between described output terminal and the earth terminal of logic power.
Wherein, when described alternating current normally works, the pressure reduction of live wire and zero line is non-vanishing when making described optocoupler conducting, and output terminal exports a direct current high level; When described alternating current normally works, the pressure reduction of live wire and zero line is zero when described optocoupler is ended, is that described load elements is powered, makes output terminal export a direct current high level by described first electric capacity.
Wherein, described optocoupler comprises: the first port, the second port, the 3rd port and the 4th port;
And described first port is connected with described first current-limiting resistance;
Described second port is connected with described second current-limiting resistance;
Described 3rd port is connected with described first electric capacity, load elements and output terminal respectively;
Described 4th port is used for being connected with interchange zero line.
Wherein, it is the light emitting diode of two reverse parallel connections between first port of described optocoupler and the 4th port, wherein the negative pole of the first light emitting diode is connected with the positive pole of the second light emitting diode, and as the first port of described optocoupler, the positive pole of the first light emitting diode is connected with the negative pole of the second light emitting diode, and as the 4th port of described optocoupler;
Second port of described optocoupler is the collector of phototriode;
3rd port of described optocoupler is the emitter of described phototriode;
Wherein, the negative pole of described first light emitting diode is connected with described first current-limiting resistance, and the positive pole of described first light emitting diode is connected with interchange zero line;
The collector of described phototriode is connected with the second current-limiting resistance;
The emitter of described phototriode is connected with described first electric capacity, load elements and output terminal;
When described alternating current normally works, the pressure reduction of live wire and zero line is non-vanishing when making the LEDs ON of described two reverse parallel connections, electric current in phototriode is excited to flow to emitter from collector, for described load elements provides electric current, described first electric capacity charges, and output terminal exports a direct current high level;
When described alternating current normally works, the pressure reduction of live wire and zero line is zero when the light emitting diode of two reverse parallel connections is ended, described phototriode cut-off, and described first capacitor discharge provides electric current for described load elements, and described output terminal exports a direct current high level;
When described AC outage or phase shortage make the light emitting diode of two reverse parallel connections end, described phototriode cut-off, described output terminal exports a direct current low level.
Wherein, it is the light emitting diode of two reverse parallel connections between first port of described optocoupler and the 4th port, wherein the negative pole of the first light emitting diode is connected with the positive pole of the second light emitting diode, and as the first port of described optocoupler, the positive pole of the first light emitting diode is connected with the negative pole of the second light emitting diode, and as the 4th port of described optocoupler;
Second port of described optocoupler is the collector of phototriode;
3rd port of described optocoupler is the emitter of described phototriode;
Wherein, the negative pole of described first light emitting diode is connected with described first current-limiting resistance, and the positive pole of described first light emitting diode is connected with interchange zero line;
The collector of described phototriode is connected with the second current-limiting resistance;
The emitter of described phototriode is connected with described load elements and output terminal;
Described first electric capacity is connected between the positive pole of logic power and output terminal;
When described alternating current normally works, the pressure reduction of live wire and zero line is non-vanishing when making the LEDs ON of described two reverse parallel connections, electric current in phototriode is excited to flow to emitter from collector, described first capacitor discharge, for described load elements provides electric current, output terminal exports a direct current high level;
When described alternating current normally works, the pressure reduction of live wire and zero line is zero when the light emitting diode of two reverse parallel connections is ended, described phototriode cut-off, logic power positive pole by for described first capacitor charging for described load elements provides electric current, described output terminal exports a direct current high level;
When described AC outage or phase shortage make the light emitting diode of two reverse parallel connections end, described phototriode cut-off, described output terminal exports a direct current low level.
Wherein, described optocoupler comprises two direct current optocouplers in parallel, wherein,
First direct current optocoupler comprises: the 3rd light emitting diode, the first phototriode;
Second direct current optocoupler comprises: the 4th light emitting diode, the second phototriode;
Wherein, the positive pole of described 3rd light emitting diode is connected with the negative pole of described first current-limiting resistance and the 4th light emitting diode, the negative pole of the 3rd light emitting diode and the positive pole of described 4th light emitting diode with exchange zero line and be connected;
First phototriode is all connected with described second current-limiting resistance with the collector of the second phototriode, and emitter is all connected with described load elements and output terminal;
Described first electric capacity is connected between the earth terminal of logic power and output terminal;
When described alternating current normally works, the pressure reduction of live wire and zero line is non-vanishing when making described 3rd light emitting diode or the 4th LEDs ON, electric current in the first phototriode or the second phototriode is excited to flow to emitter from collector, for described load elements provides electric current, described first electric capacity charges, and output terminal exports a direct current high level;
When described alternating current normally works, the pressure reduction of live wire and zero line is 0 when the 3rd light emitting diode and the 4th light emitting diode are ended, described first phototriode and the cut-off of the second phototriode, described first capacitor discharge provides electric current for described load elements, and described output terminal exports a direct current high level;
When described AC outage or phase shortage make the 3rd light emitting diode and the 4th light emitting diode end, described first phototriode and the cut-off of the second phototriode, described output terminal exports a direct current low level.
Wherein, described load elements is TTL, cmos logic gate circuit or direct current optocoupler.
Wherein, the transient state withstand voltage of described first current-limiting resistance and transient power value and input power match.
Wherein, the resistance value of described second current-limiting resistance is less than the resistance value of described load elements.
The invention has the beneficial effects as follows:
The testing circuit of the alternating current of the embodiment of the present invention, when alternating current normally works and the pressure reduction of live wire and zero line is non-vanishing, optocoupler is in conducting state, because optocoupler has voltage isolation and one-way conduction characteristic, so alternating current can by full-wave rectification, and then making the first capacitance energy storage and filtering, alternating current converts DC small signal to the most at last, exports stable direct current high level from output terminal; When alternating current normally works and the pressure reduction of live wire and zero line is zero, optocoupler is in cut-off state, and the first electric capacity is that load elements is powered, and makes output terminal export a direct current high level equally.When alternating current occurs to have a power failure, optocoupler ends, and output terminal exports a direct current low level, so by judging that the logic level of output terminal can judge whether alternating current there occurs power down mode.
So the testing circuit structure of the alternating current of the embodiment of the present invention is simple, applying flexible, and reliability is high, and antijamming capability is strong, and export isolated insulation between input, cost is low.In addition, satisfy the demand and carry out the system of single-phase AC state-detection, by simple repeated combination, just can realize the detection of three-phase alternating current state.
Accompanying drawing explanation
Fig. 1 represents the first electric capacity and the circuit theory diagrams be logically connected in the testing circuit of the alternating current of the embodiment of the present invention;
Fig. 2 represents the circuit theory diagrams that in the testing circuit of the alternating current of the embodiment of the present invention, the first electric capacity is connected with the positive pole of logic power;
Fig. 3 represents that in the testing circuit of the alternating current of the embodiment of the present invention, optocoupler is the circuit theory diagrams of the direct current optocoupler of two input end parallel connections;
Fig. 4 represents the input and output oscillogram of the testing circuit of the alternating current of the embodiment of the present invention.
Wherein in figure: R1, the first current-limiting resistance; D1, optocoupler; D101, the first port; D102, the second port; D103, the 3rd port; D104, the 4th port; R2, the second current-limiting resistance; C1, the first electric capacity; RL, load elements; L, live wire; N, zero line; The positive pole of VCC, logic power; Vo, output terminal; D2, the first direct current optocoupler; D3, the second direct current optocoupler; L1, the first light emitting diode; L2, the second light emitting diode; L3, the 3rd light emitting diode; L4, the 4th light emitting diode; J1, the first phototriode; J2, the second phototriode.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, describe the present invention below in conjunction with the accompanying drawings and the specific embodiments.
Embodiments of the invention disclose a kind of testing circuit of alternating current, comprising:
For the first current-limiting resistance R1 be connected with interchange live wire L;
For being connected with interchange zero line N, and the optocoupler D1 be connected with described first current-limiting resistance R1;
The the second current-limiting resistance R2 be connected with described optocoupler D1 and the first electric capacity C1, the other end of described second current-limiting resistance R2 connects the positive pole VCC of a logic power, the other end of the first electric capacity C1 is connected with the earth terminal of logic power, and connects for the output end vo be connected with load elements RL with one;
Wherein, when described alternating current normally works, described output end vo exports a direct current high level;
When described AC outage or phase shortage make described optocoupler D1 end, described output end vo exports a direct current low level.
In the testing circuit of the alternating current of the embodiment of the present invention, the first current-limiting resistance R1 is unsuitable excessive, and then makes input current also can not be too little, ensure that the transfer ratio of circuit.Because optocoupler D1 has voltage isolation and one-way conduction characteristic, so alternating current by full-wave rectification, and then can make the first electric capacity C1 energy storage and filtering, alternating current converts DC small signal to the most at last, exports stable direct current high level from output end vo.
Alternatively, the testing circuit of the alternating current of the embodiment of the present invention, also comprises a load elements RL, and described load elements RL is connected between described output end vo and the earth terminal of logic power.
Alternatively, when alternating current normally works, the pressure reduction of live wire L and zero line N is non-vanishing when making described optocoupler D1 conducting, and output end vo exports a direct current high level; When described alternating current normally works, the pressure reduction of live wire L and zero line N is zero when described optocoupler D1 is ended, is that described load elements RL powers, makes output end vo export a direct current high level by described first electric capacity C1.In addition, if alternating current occurs to have a power failure or phase shortage, then optocoupler D1 ends, and output end vo exports a direct current low level, so by judging that the logic level of output end vo can judge whether alternating current there occurs power down mode.
Alternatively, optocoupler D1 comprises: the first port D101, the second port D102, the 3rd port D103 and the 4th port D104;
Wherein, described first port D101 is connected with described first current-limiting resistance R1;
Described second port D102 is connected with described second current-limiting resistance R2;
Described 3rd port D103 is connected with the first electric capacity C1, described load elements RL and output end vo respectively;
Described 4th port D104 is used for being connected with interchange zero line N.
Alternatively, as shown in Figure 1, it is the light emitting diode of two reverse parallel connections between the first port D101 of described optocoupler D1 and the 4th port D104, wherein the negative pole of the first light emitting diode L1 is connected with the positive pole of the second light emitting diode L2, and as the first port D101 of described optocoupler D1, the positive pole of the first light emitting diode L1 is connected with the negative pole of the second light emitting diode L2, and as the 4th port D104 of described optocoupler D1;
The second port D102 of described optocoupler D1 is the collector of phototriode;
The 3rd port D103 of described optocoupler D1 is the emitter of described phototriode;
Wherein, the negative pole of described first light emitting diode L1 is connected with described first current-limiting resistance R1, and the positive pole of described first light emitting diode L1 is connected with interchange zero line N;
The collector of described phototriode is connected with the second current-limiting resistance R2;
The emitter of described phototriode is connected with described first electric capacity C1, load elements RL and output end vo;
When described alternating current normally works, the pressure reduction of live wire L and zero line N is non-vanishing when making the LEDs ON of described two reverse parallel connections, electric current in phototriode is excited to flow to emitter from collector, for described load elements RL provides electric current, described first electric capacity C1 charges, and output end vo exports a direct current high level;
When described alternating current normally works, the pressure reduction of live wire L and zero line N is zero when the light emitting diode of two reverse parallel connections is ended, described phototriode cut-off, described first electric capacity C1 discharges for described load elements RL provides electric current, and described output end vo exports a direct current high level;
When described AC outage or phase shortage make the light emitting diode of two reverse parallel connections end, described phototriode cut-off, described output end vo exports a direct current low level.
The testing circuit of the alternating current in the embodiment of the present invention, optocoupler D1 is for exchanging optocoupler, if the voltage of the live wire L of alternating current is greater than the voltage of zero line N, optocoupler D1 conducting, and the first light emitting diode L1 of optocoupler D1 inside is luminous, then excite photosensitive triode ON, namely produce by the electric current of collector to emitter in phototriode, this electric current is that the first electric capacity C1 charges, and powers to load elements RL, and now output end vo exports direct current high level; If the voltage of the zero line N of alternating current is greater than the voltage of live wire L, the second light emitting diode L2 of optocoupler D1 inside is luminous equally, and exciting light triode produces by the electric current of collector to emitter, and then exports direct current high level from output end vo.
In addition, because alternating current exists the situation of zero crossing, then optocoupler D1 there will be cut-off situation, as long as but the capacity of the first electric capacity C1 reaches enough requirements, and the resistance value of the second current-limiting resistance R2 is much smaller than the resistance value of load elements RL, voltage then on the first electric capacity C1 and ripple, in ac zero-crossing point and scope that after just maintaining between the optocoupler D1 off period, level logic circuit requires, realize the voltage stabilizing of direct current high level and export.
When alternating current occurs to have a power failure or phase shortage, then optocoupler D1 is in cut-off state, but the electricity that the first electric capacity C1 stores can not make the electric current keeping in load elements RL continuing, namely the voltage of output end vo can drop to low level, so by judging that output end vo outputs direct current low level and can judge to there occurs power failure or phase shortage.
Alternatively, as shown in Figure 2, it is the light emitting diode of two reverse parallel connections between the first port D101 of described optocoupler D1 and the 4th port D104, wherein the negative pole of the first light emitting diode L1 is connected with the positive pole of the second light emitting diode L2, and as the first port D101 of described optocoupler D1, the positive pole of the first light emitting diode L1 is connected with the negative pole of the second light emitting diode L2, and as the 4th port D104 of described optocoupler D1;
The second port D102 of described optocoupler D1 is the collector of phototriode;
The 3rd port D103 of described optocoupler D1 is the emitter of described phototriode;
Wherein, the negative pole of described first light emitting diode L1 is connected with described first current-limiting resistance R1, and the positive pole of described first light emitting diode L1 is connected with interchange zero line N;
The collector of described phototriode is connected with the second current-limiting resistance R2;
The emitter of described phototriode is connected with described load elements RL and output end vo;
Described first electric capacity C1 is connected between the positive pole VCC of logic power and output end vo;
When described alternating current normally works, the pressure reduction of live wire L and zero line N is non-vanishing when making the LEDs ON of described two reverse parallel connections, electric current in phototriode is excited to flow to emitter from collector, described first electric capacity C1 discharges, for described load elements RL provides electric current, output end vo exports a direct current high level;
When described alternating current normally works, the pressure reduction of live wire L and zero line N is zero when the light emitting diode of two reverse parallel connections is ended, described phototriode cut-off, the positive pole VCC of logic power is by providing electric current for described first electric capacity C1 is charged as described load elements RL, and described output end vo exports a direct current high level;
When described AC outage or phase shortage make the light emitting diode of two reverse parallel connections end, described phototriode cut-off, described output end vo exports a direct current low level.
As shown in Figure 2, the first electric capacity C1 is connected between the positive pole VCC of logic power and output end vo, then when the pressure reduction of live wire L and zero line N is non-vanishing, and optocoupler D1 conducting, the first electric capacity C1 is discharged by the second current-limiting resistance R2; When the pressure reduction of live wire L and zero line N is zero, between the optocoupler D1 off period, the first electric capacity C1 is in charged state, and provides afterflow and regulated voltage level to load elements RL.Now, as long as the velocity of discharge of the first electric capacity C1 is faster than charging rate, output end vo still can be made to export stable direct current high level.And if generation exchanges power failure or phase shortage, then optocoupler D1 ends, and then can export a direct current low level from output end vo.
Alternatively, optocoupler D1 comprises two direct current optocouplers in parallel, wherein,
First direct current optocoupler D2 comprises: the 3rd light emitting diode L3, the first phototriode J1;
Second direct current optocoupler D3 comprises: the 4th light emitting diode L4, the second phototriode J2;
Wherein, the positive pole of described 3rd light emitting diode L3 is connected with the negative pole of described first current-limiting resistance R1 and the 4th light emitting diode L4, the negative pole of the 3rd light emitting diode L3 and the positive pole of described 4th light emitting diode L4 with exchange zero line N and be connected;
First phototriode J1 is all connected with described second current-limiting resistance R2 with the collector of the second phototriode J2, and emitter is all connected with described load elements RL and output end vo;
Described first electric capacity C1 is connected between the earth terminal of logic power and output end vo;
When described alternating current normally works, the pressure reduction of live wire L and zero line N is non-vanishing when making described 3rd light emitting diode L3 or the 4th light emitting diode L4 conducting, electric current in the first phototriode J1 or the second phototriode J2 is excited to flow to emitter from collector, for described load elements RL provides electric current, described first electric capacity C1 charges, and output end vo exports a direct current high level;
When described alternating current normally works, the pressure reduction of live wire L and zero line N is 0 when the 3rd light emitting diode L3 and the 4th light emitting diode L4 is ended, described first phototriode J1 and the second phototriode J2 ends, described first electric capacity C1 discharges for described load elements RL provides electric current, and described output end vo exports a direct current high level;
When described AC outage or phase shortage make the 3rd light emitting diode L3 and the 4th light emitting diode L4 end, described first phototriode J1 and the second phototriode J2 ends, and described output end vo exports a direct current low level.
As shown in Figure 3, the other end ground connection of the first electric capacity C1, and the input end reverse parallel connection of the first direct current optocoupler D2 and the second direct current optocoupler D3, and be connected with the zero line N of alternating current respectively at the first current-limiting resistance R1, and the output end vo of the first direct current optocoupler D2 and the second direct current optocoupler D3 is in parallel, and be connected with the first electric capacity C1 with the second current-limiting resistance R2 respectively.
When alternating current normally works, as shown in Figure 3, if the voltage of the live wire L of alternating current is greater than the voltage of zero line N, then the 3rd light emitting diode L3 is luminous, then excite in the first phototriode J1 and flow through electric current, and make the first electric capacity C1 carry out being charged as load elements RL to provide electric current, and output end vo exports a direct current high level; Be understandable that, when the voltage of the zero line N of alternating current is greater than the voltage of live wire L, the 4th light emitting diode L4 is luminous, and output end vo can be made equally to export a direct current high level.And when ac zero-crossing point, due to the first electric capacity C1 storing electricity, so now the first electric capacity C1 is that load elements RL powers, as long as same first electric capacity C1 capacity is enough, the resistance value of the second current-limiting resistance R2 is much smaller than the resistance value of load elements RL, and output end vo will realize the voltage stabilizing of direct current high level and export.
When interchange point occurs to have a power failure or phase shortage, then the 3rd light emitting diode L3 and the 4th light emitting diode L4 all ends, and described first phototriode J1 and the second phototriode J2 also all ends, and described output end vo then exports a direct current low level.
As shown in Figure 4, represented by dotted arrows is with the alternating current 220V voltage signal of input, solid line represents output voltage when logic power is 5V, the detection electric current of the interchange of the embodiment of the present invention converts the interchange of input to DC signal output, in the ac zero-crossing point moment because there is dead band, but because the existence of the first electric capacity C1, make this direct current signal directly can carry out Logic judgment.
Alternatively, load elements RL is TTL, cmos logic gate circuit or direct current optocoupler, certainly, is also not limited in this to load elements RL.
Alternatively, the transient state withstand voltage of the first current-limiting resistance R1 and transient power value and input power match, and namely will reach the required value of input power.
Alternatively, the resistance value of the second current-limiting resistance R2 is less than the resistance value of described load elements RL, makes the energy being greater than the electric discharge of optocoupler D1 blocking interval at optocoupler D1 conduction period rechargeable energy, and then can export stable direct current high level at output end vo.
Above-described is the preferred embodiment of the present invention; should be understood that the ordinary person for the art; can also make some improvements and modifications not departing under principle prerequisite of the present invention, these improvements and modifications are also in protection scope of the present invention.
Claims (10)
1. a testing circuit for alternating current, is characterized in that, comprising:
For the first current-limiting resistance be connected with interchange live wire;
For being connected with interchange zero line, and the optocoupler be connected with described first current-limiting resistance;
The second current-limiting resistance be connected with described optocoupler and the first electric capacity, the other end of described second current-limiting resistance connects the positive pole of a logic power, the described other end of the first electric capacity is connected with the earth terminal of logic power, and connects for the output terminal be connected with load elements with one;
Wherein, when described alternating current normally works, described output terminal exports a direct current high level;
When described AC outage or phase shortage make described optocoupler end, described output terminal exports a direct current low level.
2. the testing circuit of alternating current according to claim 1, is characterized in that, also comprises a load elements, and described load elements is connected between described output terminal and the earth terminal of logic power.
3. the testing circuit of alternating current according to claim 1, is characterized in that, when described alternating current normally works, the pressure reduction of live wire and zero line is non-vanishing when making described optocoupler conducting, and output terminal exports a direct current high level; When described alternating current normally works, the pressure reduction of live wire and zero line is zero when described optocoupler is ended, is that described load elements is powered, makes output terminal export a direct current high level by described first electric capacity.
4. the testing circuit of alternating current according to claim 3, is characterized in that, described optocoupler comprises: the first port, the second port, the 3rd port and the 4th port;
Wherein, described first port is connected with described first current-limiting resistance;
Described second port is connected with described second current-limiting resistance;
Described 3rd port is connected with described first electric capacity, load elements and output terminal respectively;
Described 4th port is used for being connected with interchange zero line.
5. the testing circuit of alternating current according to claim 4, is characterized in that,
It is the light emitting diode of two reverse parallel connections between first port of described optocoupler and the 4th port, wherein the negative pole of the first light emitting diode is connected with the positive pole of the second light emitting diode, and as the first port of described optocoupler, the positive pole of the first light emitting diode is connected with the negative pole of the second light emitting diode, and as the 4th port of described optocoupler;
Second port of described optocoupler is the collector of phototriode;
3rd port of described optocoupler is the emitter of described phototriode;
Wherein, the negative pole of described first light emitting diode is connected with described first current-limiting resistance, and the positive pole of described first light emitting diode is connected with interchange zero line;
The collector of described phototriode is connected with the second current-limiting resistance;
The emitter of described phototriode is connected with described first electric capacity, load elements and output terminal;
When described alternating current normally works, the pressure reduction of live wire and zero line is non-vanishing when making the LEDs ON of described two reverse parallel connections, electric current in phototriode is excited to flow to emitter from collector, for described load elements provides electric current, described first electric capacity charges, and output terminal exports a direct current high level;
When described alternating current normally works, the pressure reduction of live wire and zero line is zero when the light emitting diode of two reverse parallel connections is ended, described phototriode cut-off, and described first capacitor discharge provides electric current for described load elements, and described output terminal exports a direct current high level;
When described AC outage or phase shortage make the light emitting diode of two reverse parallel connections end, described phototriode cut-off, described output terminal exports a direct current low level.
6. the testing circuit of alternating current according to claim 4, is characterized in that,
It is the light emitting diode of two reverse parallel connections between first port of described optocoupler and the 4th port, wherein the negative pole of the first light emitting diode is connected with the positive pole of the second light emitting diode, and as the first port of described optocoupler, the positive pole of the first light emitting diode is connected with the negative pole of the second light emitting diode, and as the 4th port of described optocoupler;
Second port of described optocoupler is the collector of phototriode;
3rd port of described optocoupler is the emitter of described phototriode;
Wherein, the negative pole of described first light emitting diode is connected with described first current-limiting resistance, and the positive pole of described first light emitting diode is connected with interchange zero line;
The collector of described phototriode is connected with the second current-limiting resistance;
The emitter of described phototriode is connected with described load elements and output terminal;
Described first electric capacity is connected between the positive pole of logic power and output terminal;
When described alternating current normally works, the pressure reduction of live wire and zero line is non-vanishing when making the LEDs ON of described two reverse parallel connections, electric current in phototriode is excited to flow to emitter from collector, described first capacitor discharge, for described load elements provides electric current, output terminal exports a direct current high level;
When described alternating current normally works, the pressure reduction of live wire and zero line is zero when the light emitting diode of two reverse parallel connections is ended, described phototriode cut-off, logic power positive pole by for described first capacitor charging for described load elements provides electric current, described output terminal exports a direct current high level;
When described AC outage or phase shortage make the light emitting diode of two reverse parallel connections end, described phototriode cut-off, described output terminal exports a direct current low level.
7. the testing circuit of alternating current according to claim 4, is characterized in that, described optocoupler comprises two direct current optocouplers in parallel, wherein,
First direct current optocoupler comprises: the 3rd light emitting diode, the first phototriode;
Second direct current optocoupler comprises: the 4th light emitting diode, the second phototriode;
Wherein, the positive pole of described 3rd light emitting diode is connected with the negative pole of described first current-limiting resistance and the 4th light emitting diode, the negative pole of the 3rd light emitting diode and the positive pole of described 4th light emitting diode with exchange zero line and be connected;
First phototriode is all connected with described second current-limiting resistance with the collector of the second phototriode, and emitter is all connected with described load elements and output terminal;
Described first electric capacity is connected between the earth terminal of logic power and output terminal;
When described alternating current normally works, the pressure reduction of live wire and zero line is non-vanishing when making described 3rd light emitting diode or the 4th LEDs ON, electric current in the first phototriode or the second phototriode is excited to flow to emitter from collector, for described load elements provides electric current, described first electric capacity charges, and output terminal exports a direct current high level;
When described alternating current normally works, the pressure reduction of live wire and zero line is 0 when the 3rd light emitting diode and the 4th light emitting diode are ended, described first phototriode and the cut-off of the second phototriode, described first capacitor discharge provides electric current for described load elements, and described output terminal exports a direct current high level;
When described AC outage or phase shortage make the 3rd light emitting diode and the 4th light emitting diode end, described first phototriode and the cut-off of the second phototriode, described output terminal exports a direct current low level.
8. the testing circuit of the alternating current according to any one of claim 1-7, is characterized in that, described load elements is TTL, cmos logic gate circuit or direct current optocoupler.
9. the testing circuit of the alternating current according to any one of claim 1-7, is characterized in that, the transient state withstand voltage of described first current-limiting resistance and transient power value and input power match.
10. the testing circuit of the alternating current according to any one of claim 1-7, is characterized in that, the resistance value of described second current-limiting resistance is less than the resistance value of described load elements.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410529678.9A CN105572523A (en) | 2014-10-09 | 2014-10-09 | AC detection circuit |
| PCT/CN2015/071560 WO2015184832A1 (en) | 2014-10-09 | 2015-01-26 | Alternating current detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410529678.9A CN105572523A (en) | 2014-10-09 | 2014-10-09 | AC detection circuit |
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| CN105572523A true CN105572523A (en) | 2016-05-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410529678.9A Pending CN105572523A (en) | 2014-10-09 | 2014-10-09 | AC detection circuit |
Country Status (2)
| Country | Link |
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| CN (1) | CN105572523A (en) |
| WO (1) | WO2015184832A1 (en) |
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Application publication date: 20160511 |