CN101452015A - Low power consumption isolation detection circuit for detecting high-pressure AC and detecting method thereof - Google Patents
Low power consumption isolation detection circuit for detecting high-pressure AC and detecting method thereof Download PDFInfo
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- CN101452015A CN101452015A CNA2007101712130A CN200710171213A CN101452015A CN 101452015 A CN101452015 A CN 101452015A CN A2007101712130 A CNA2007101712130 A CN A2007101712130A CN 200710171213 A CN200710171213 A CN 200710171213A CN 101452015 A CN101452015 A CN 101452015A
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Abstract
The invention discloses a low power dissipation insulation testing circuit used for testing HVAC and a testing method thereof. The circuit includes a HVAC signal source, two current insulation transmission modules connected in parallel and a low voltage testing module, also comprises a sampling capacitance, which is connected with the HVAC signal source after being connected with the two current insulation transmission modules in parallel, wherein the low voltage testing module is connected with the output ends of the two current insulation transmission modules. The inventive low power dissipation insulation testing circuit used for testing HVAC converts voltage signals of the HVAC into capacitive current signals through capacitive loads, then isolatively transmits the current signals to the low voltage signal processing module through the insulation transmission modules, and tests the HVAC signals. During the process, the capacitive loads of the alternating voltage does not waste energy, the inventive signal sampling circuit does not waste energy for obtaining capacitance current signals.
Description
Technical field
The present invention relates to the isolation detection circuit and the detection method thereof of the signal of the alternating current in a kind of electronic applications, particularly a kind of low-power consumption isolation detection circuit and detection method thereof that is used to detect High Level AC Voltage.
Background technology
At present, for the detection of High Level AC Voltage with isolate circuit commonly used in the output and have two kinds, a kind of is to isolate and High Level AC Voltage is changed into low-voltage AC by transformer 1 to give the circuit that comparer 2 detects output signal again, be illustrated in figure 1 as basic circuit schematic diagram by transformer 1 isolation detection, this circuit is to utilize transformer 1 to isolate transformation high-voltage AC signal is converted to low-voltage signal as seen from Figure 1, testing circuit by low pressure detects the respective point in the low-voltage signal then, thereby detects corresponding high-voltage alternating electric signal.There is loss in the transformer of using in this circuit, has caused circuit loss.Second method is that a voltage signal that exchanges is become current signal by resistance sampling, and the testing circuit that is transferred to low pressure by light-coupled isolation is handled and detected current signal again, detects the high-voltage alternating crossover point signal.Be illustrated in figure 2 as by resistance connection light-coupled isolation High Level AC Voltage, handle conversion process to detect corresponding point by the testing circuit 3 of low pressure again.Optocoupler 11,12 needs certain electric current just can make its transmission ratio realize linearity in this circuit, promptly transmit constant rate, this electric current formation then input high pressure realizes by corresponding resistance R 1 and R2 step-down, so resistance R 1 in this circuit and R2 are can not value too little, get I=U/R by ohm theorem, so ohmically voltage and current is synchronous, its electric current variation tendency is followed change in voltage, shown in the change curve of voltage and current among Fig. 3.So the power consumption that electric current in the sample circuit and voltage product form is mainly born by resistance R 1 and R2, has caused the loss of circuit.In the method because the same-phase of voltage and current, after current delivery, the detection correspondence of optocoupler 11,12 output currents the detection of input High Level AC Voltage.
Summary of the invention
The objective of the invention is in order to overcome the deficiencies in the prior art, a kind of low-power consumption isolation detection circuit and detection method thereof that is used to detect High Level AC Voltage is provided, it can reduce the wastage.
A kind of technical scheme that realizes above-mentioned purpose is: a kind of low-power consumption isolation detection circuit that is used to detect High Level AC Voltage, comprise a high-voltage AC signal source, two electric current isolated transmission module that are connected in parallel and a low pressure detection module, also comprise a sampling capacitor, this sampling capacitor is connected in series with the electric current isolated transmission module of described two parallel connections and then is connected with the high-voltage AC signal source, and described low pressure detection module is connected with the output terminal of two electric current isolated transmission module.
The above-mentioned low-power consumption isolation detection circuit that is used to detect High Level AC Voltage, wherein, one in described two electric current isolated transmission module that are connected in parallel can be replaced by diode, and described low pressure detection module is connected with the output terminal of another electric current isolated transmission module.
The above-mentioned low-power consumption isolation detection circuit that is used to detect High Level AC Voltage; wherein; also comprise a protective resistance; this protective resistance and sampling capacitor and the electric current isolated transmission module that is connected in parallel and the diode back that is connected in series is connected with the high-voltage AC signal source, and described low pressure detection module is connected with the output terminal of electric current isolated transmission module.
Above-mentioned any one is used to detect the low-power consumption isolation detection circuit of High Level AC Voltage, and wherein, described electric current isolated transmission module is an optocoupler that is made of light emitting diode and phototriode.
The another kind of technical scheme that realizes above-mentioned purpose is: a kind of method that is used to detect the low-power consumption isolation detection of High Level AC Voltage, be executed in the low-power consumption isolation detection circuit that above-mentioned being used to detects High Level AC Voltage, and may further comprise the steps:
Switch process is converted to the capacitance current signal with high-voltage AC signal;
Transmitting step is transferred to low-pressure side with above-mentioned capacitance current signal;
Handle and detect step, the above-mentioned current signal that is transferred to low-pressure side is handled and detected.
The above-mentioned method that is used to detect the low-power consumption isolation detection of High Level AC Voltage, wherein, described switch process is by capacitive load ac voltage signal to be converted to the capacitance current signal; Described transmitting step is by the electric current isolated transmission module on high-tension side capacitance current signal to be transferred to low-pressure side; It is that the current signal that will be transferred to low-pressure side is judged the parameter of high-voltage AC signal by the detection of low pressure detection module and with this that described processing detects step.
Owing to adopted be used to detect the low-power consumption isolation detection circuit of High Level AC Voltage and the technical scheme of detection method thereof of the present invention, promptly the voltage signal of High Level AC Voltage is changed into the current signal of electric capacity by capacitive load, again this current signal is isolated current signal the signal processing module that is transferred to low pressure by isolated transmission module, and therefrom detect high-voltage AC signal, in this process, the capacitive load of alternating voltage is loss of energy not, so the acquisition of signal sampling circuit of the present invention " capacitance current signal " does not need loss of energy, eliminated the energy loss that realizes the AC signal isolation detection circuit in the prior art, and the detection degree of accuracy is improved also.
Description of drawings
Fig. 1 is used to detect the schematic diagram of the isolation detection circuit of High Level AC Voltage for prior art a kind of;
Fig. 2 is used to detect the schematic diagram of the isolation detection circuit of High Level AC Voltage for the another kind of prior art;
Fig. 3 is the change curve of the voltage and current signal of the testing circuit detection among Fig. 2;
Fig. 4 is the schematic diagram that is used to detect the low-power consumption isolation detection circuit of High Level AC Voltage of the present invention;
Fig. 5 is the change curve of the voltage and current signal that testing circuit of the present invention detects among Fig. 4;
Fig. 6 is the schematic diagram of the most preferred embodiment of the low-power consumption isolation detection circuit that is used to detect High Level AC Voltage of the present invention;
Fig. 7 is the schematic diagram of second kind of embodiment of the low-power consumption isolation detection circuit that is used to detect High Level AC Voltage of the present invention;
Fig. 8 is the change curve of the voltage and current signal that testing circuit of the present invention detects among Fig. 6,7.
Embodiment
In order to understand technical scheme of the present invention better, below by embodiment particularly and be described in detail in conjunction with the accompanying drawings:
See also Fig. 4, it among the figure low-power consumption isolation detection circuit that is used to detect High Level AC Voltage of the present invention, comprise tested high-voltage AC signal source AC, a sampling capacitor C2, two electric current isolated transmission module 11,12, a low pressure detection module 3, sampling capacitor C2, two electric current isolated transmission module 11,12, a low pressure detection module 3 sampling capacitor C2 and two electric current isolated transmission module that are connected in parallel, 11,12 series connection backs are connected with high-voltage AC signal source AC, and low pressure detection module 3 is connected with the output terminal of two electric current isolated transmission module 11,12.
Electric current isolated transmission module 11,12 is an optocoupler that is made of light emitting diode and phototriode, also can be the circuit module that other has similar isolation and current delivery function.
See also Fig. 6 again, be first embodiment that is used to detect the low-power consumption isolation detection circuit of High Level AC Voltage of the present invention among the figure, it is replaced an electric current isolated transmission module 12 in two in the foregoing circuit electric current isolated transmission module that are connected in parallel 11,12 by diode D1.The circuit of this embodiment comprises tested high-voltage AC signal source AC, a sampling capacitor C2, electric current isolated transmission module 11, a diode D1 and a low pressure detection module 3, wherein, sampling capacitor C2 is connected in series with diode D1 with the electric current isolated transmission module 11 that is connected in parallel and then is connected with high-voltage AC signal source AC, and low pressure detection module 3 is connected with the output terminal of electric current isolated transmission module 11.
See also Fig. 7 again; among the figure second embodiment that is used to detect the low-power consumption isolation detection circuit of High Level AC Voltage of the present invention; it comprises tested high-voltage AC signal source AC, a protective resistance R1, a sampling capacitor C2, electric current isolated transmission module 11, a diode D1 and a low pressure detection module 3; wherein; protective resistance R1 and sampling capacitor C2 and the electric current isolated transmission module 11 that is connected in parallel and the diode D1 back that is connected in series is connected with high-voltage AC signal source AC, and low pressure detection module 3 is connected with the output terminal of electric current isolated transmission module 11.The effect of protective resistance R1 is that holding circuit may be damaged circuit in the moment that powers on; this protective resistance R1 can be alleviated the instantaneous high pressure of powered on moment; just often little at circuit owing to its resistance, so its relation influence to AC signal and output current in the circuit is very little, can ignore.
The principle of work that is used to detect the low-power consumption isolation detection circuit of High Level AC Voltage of the present invention is as seen from Figure 4, the input current of optocoupler diode is that capacitor C 2 by series connection with it realizes in the testing circuit of the present invention, the forward voltage required owing to the light emitting diode of optocoupler is very little, corresponding relation influence to current signal on the capacitor C 2 in this testing circuit and ac input signal is very little, can ignore and not remember, be easy analysis, when analytic signal, ignore optocoupler, the forward voltage of ignoring the optocoupler diode so, establish input voltage U so, the capacitive reactance of electric capacity (or being called reactance) is
(wherein j is the imaginary part unit in the complex representation method, ω=2 π f, and f is a frequency input signal, domestic civilian High Level AC Voltage is 50HZ at present), get electric current by ohm theorem
Have this current formula as can be known input voltage and electric current have 90 ° phase differential, and be 90 ° of electric current leading voltages, it exchanges curve map as shown in Figure 5, positive negative indication direction among the figure.Learn by Fig. 5, when voltage by peak P when zero point, H changed, corresponding electric current by zero point P ' change i.e. electric current arrival peak H ' when voltage arrives zero crossing H to peak H '.Because optocoupler input and output electric current trend unanimity, thus 90 ° of leading input ac voltage signals of optocoupler output current, thus obtained the phase place of input voltage signal by the output current phase place.And the frequency of the corresponding input voltage signal of the frequency of optocoupler output current has promptly obtained frequency of input voltage.If the input voltage effective value is Vin, capacitance current is that the input current of optocoupler is Iin, and the optocoupler output current is Iout, and the optocoupler transfer ratio is CTR, is defined by CTR
Know,
Get Vin=Zc*Iin by above-mentioned ohm theorem, thereby obtain the amplitude of input ac voltage
, wherein f is the frequency of input exchange signal, c is the value of sampling capacitor C2.Therefore can obtain the phase place of AC-input voltage signal by optocoupler output current wave information, frequency and amplitude (effective value), in addition, the input exchange signal sample circuit is a capacitive load, do not produce loss, phase relation from electric current and voltage, electric current and voltage-phase differ 90 °, its active power is zero, small power consumption only when appearring intersecting in voltage and current, nonzero value takes place, can ignore than almost with the power consumption of the circuit of prior art, circuit of the present invention so just can be lossless at sample circuit or the situation of little loss under all parameters of output signal after the isolate high-voltage alternating electric signal that obtains importing: amplitude, phase place and frequency.
The electric current isolation module of two tunnel parallel connections among Fig. 4 transmits the positive half cycle and the negative half period of current signal in the electric capacity respectively, because AC signal is clocklike, as long as have the half period even the signal in 1/4 cycle just can detect whole signals, testing circuit of the present invention as shown in Figure 6, be alternating current to be isolated transmission, detect an example of a zero crossing of half period of input AC electricity by optocoupler 11.Fig. 6 diode D1 effect is the too big inverse current path that provides that punctures of reverse voltage that bears for light emitting diode in the optocoupler 11 after avoiding alternating current oppositely, if flowing through the electric current of optocoupler light emitting diode is Id, the electric current that flows through diode D1 is Id1, as shown in Figure 8, when input voltage by the C point when the D point changes, have electric current I d to flow through in the optocoupler light emitting diode, to shown in the curve of D ', this moment, the electric current I d1 of diode D1 was 0 to its variation tendency as C ' among the figure; When input voltage by the D point when the E point changes, have electric current I d1 to flow through among the diode D1, its variation tendency is as D among Fig. 8 " to E " curve shown in, this moment, the electric current I d of optocoupler light emitting diode was 0.Light emitting diode interworking in the one-period that AC-input voltage changes in diode D1 and the optocoupler 11, therefore testing circuit shown in Figure 6 is an one-way transmission.
Voltage owing to diode D1 conducting in the testing circuit shown in Figure 6 is very little, the major part of input voltage is shared by capacitor C 2, and capacitor C 2 is non-energy dissipation device, so AC signal can be ignored by the loss ratio of the very little and present testing circuit of loss loss in the process of optocoupler transmission.
Fig. 7 is an improvement on Fig. 6 circuit, also can on the circuit of Fig. 4, increase this resistance, its effect is to prevent to be added to above the current module and to damage device at the instantaneous pressure that powers on, can not want this resistance after the operate as normal, in the side circuit, the very for a short time capacitive reactance that is far smaller than sampling capacitor C2 of this resistance, thus very little to influence circuit, when analysis circuit, can ignore and not remember.
A kind of method that is used to detect the low-power consumption isolation detection of High Level AC Voltage of the present invention is executed in the low-power consumption isolation detection circuit that above-mentioned being used to detects High Level AC Voltage, may further comprise the steps:
Switch process is by capacitive load C2 ac voltage signal to be converted to the capacitance current signal;
Transmitting step is by electric current isolated transmission module 11,12 on high-tension side capacitance current signal to be transferred to low-pressure side;
Handle and detect step, the current signal that is transferred to low-pressure side is judged the parameter of high-voltage AC signal by 3 detections of low pressure detection module and with this.
Those of ordinary skill in the art will be appreciated that, above embodiment is used for illustrating the present invention, and be not to be used as limitation of the invention, as long as in connotation scope of the present invention, all will drop in claims scope of the present invention variation, the modification of the above embodiment.
Claims (7)
1. low-power consumption isolation detection circuit that is used to detect High Level AC Voltage, comprise a high-voltage AC signal source, two electric current isolated transmission module that are connected in parallel and a low pressure detection module, it is characterized in that, also comprise a sampling capacitor, this sampling capacitor is connected in series with the electric current isolated transmission module of described two parallel connections and then is connected with the high-voltage AC signal source, and described low pressure detection module is connected with the output terminal of two electric current isolated transmission module.
2. the low-power consumption isolation detection circuit that is used to detect High Level AC Voltage according to claim 1, it is characterized in that, one in described two electric current isolated transmission module that are connected in parallel can be replaced by diode, and described low pressure detection module is connected with the output terminal of another electric current isolated transmission module.
3. the low-power consumption isolation detection circuit that is used to detect High Level AC Voltage according to claim 1 and 2; it is characterized in that; also comprise a protective resistance; this protective resistance and sampling capacitor and the electric current isolated transmission module that is connected in parallel and the diode back that is connected in series is connected with the high-voltage AC signal source, and described low pressure detection module is connected with the output terminal of electric current isolated transmission module.
4. the low-power consumption isolation detection circuit that is used to detect High Level AC Voltage according to claim 1 and 2 is characterized in that, described electric current isolated transmission module is an optocoupler that is made of light emitting diode and phototriode.
5. the low-power consumption isolation detection circuit that is used to detect High Level AC Voltage according to claim 3 is characterized in that, described electric current isolated transmission module is an optocoupler that is made of light emitting diode and phototriode.
6. a method that is used to detect the low-power consumption isolation detection of High Level AC Voltage is executed in the low-power consumption isolation detection circuit that above-mentioned being used to detects High Level AC Voltage, may further comprise the steps:
Switch process is converted to the capacitance current signal with high-voltage AC signal;
Transmitting step is transferred to low-pressure side with above-mentioned capacitance current signal;
Handle and detect step, the above-mentioned current signal that is transferred to low-pressure side is handled and detected.
7. the method that is used to detect the low-power consumption isolation detection of High Level AC Voltage according to claim 6 is characterized in that described switch process is by capacitive load ac voltage signal to be converted to the capacitance current signal; Described transmitting step is by the electric current isolated transmission module on high-tension side capacitance current signal to be transferred to low-pressure side; It is that the current signal that will be transferred to low-pressure side is judged the parameter of high-voltage AC signal by the detection of low pressure detection module and with this that described processing detects step.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101712130A CN101452015A (en) | 2007-11-29 | 2007-11-29 | Low power consumption isolation detection circuit for detecting high-pressure AC and detecting method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2007101712130A CN101452015A (en) | 2007-11-29 | 2007-11-29 | Low power consumption isolation detection circuit for detecting high-pressure AC and detecting method thereof |
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| CNA2007101712130A Pending CN101452015A (en) | 2007-11-29 | 2007-11-29 | Low power consumption isolation detection circuit for detecting high-pressure AC and detecting method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106291217A (en) * | 2016-08-18 | 2017-01-04 | 四川泛华航空仪表电器有限公司 | The method of monitoring aerial ignition device high-voltage charge and discharge road fault |
| CN109828140A (en) * | 2019-02-15 | 2019-05-31 | 杭州老板电器股份有限公司 | Electric current value calculating method, device and electronic equipment |
| CN110535458A (en) * | 2019-07-16 | 2019-12-03 | 青岛乾程科技股份有限公司 | A kind of signal rate Amplification and insulation transmission circuit |
| CN113614552A (en) * | 2019-03-28 | 2021-11-05 | 泰瑞达公司 | Test system supporting backward compliance |
-
2007
- 2007-11-29 CN CNA2007101712130A patent/CN101452015A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106291217A (en) * | 2016-08-18 | 2017-01-04 | 四川泛华航空仪表电器有限公司 | The method of monitoring aerial ignition device high-voltage charge and discharge road fault |
| CN106291217B (en) * | 2016-08-18 | 2023-08-01 | 四川泛华航空仪表电器有限公司 | Method for monitoring faults of high-voltage charge-discharge circuit of aviation igniter |
| CN109828140A (en) * | 2019-02-15 | 2019-05-31 | 杭州老板电器股份有限公司 | Electric current value calculating method, device and electronic equipment |
| CN109828140B (en) * | 2019-02-15 | 2021-09-24 | 杭州老板电器股份有限公司 | Current value calculation method and device and electronic equipment |
| CN113614552A (en) * | 2019-03-28 | 2021-11-05 | 泰瑞达公司 | Test system supporting backward compliance |
| CN110535458A (en) * | 2019-07-16 | 2019-12-03 | 青岛乾程科技股份有限公司 | A kind of signal rate Amplification and insulation transmission circuit |
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Open date: 20090610 |