CN109471013A - For the pulse testing method of the bandwidth of HCNR200 linear optical coupling isolation circuit - Google Patents
For the pulse testing method of the bandwidth of HCNR200 linear optical coupling isolation circuit Download PDFInfo
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- CN109471013A CN109471013A CN201811273474.8A CN201811273474A CN109471013A CN 109471013 A CN109471013 A CN 109471013A CN 201811273474 A CN201811273474 A CN 201811273474A CN 109471013 A CN109471013 A CN 109471013A
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- isolation circuit
- optical coupling
- linear optical
- bandwidth
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/2801—Testing of printed circuits, backplanes, motherboards, hybrid circuits or carriers for multichip packages [MCP]
- G01R31/281—Specific types of tests or tests for a specific type of fault, e.g. thermal mapping, shorts testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- General Physics & Mathematics (AREA)
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- Microelectronics & Electronic Packaging (AREA)
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- Optical Communication System (AREA)
Abstract
The present invention provides a kind of pulse testing method of bandwidth for HCNR200 linear optical coupling isolation circuit, and its step are as follows: one: selection HCNR200 linear optical coupling isolation circuit is simultaneously configured；Two: building test macro used in test isolation circuit bandwidth；Three: bandwidth test is carried out to HCNR200 linear optical coupling isolation circuit；Four: HCNR200 linear optical coupling isolation circuit bandwidth test data is handled and analyzed；Pass through above step, it is tested for the bandwidth of HCNR200 linear optical coupling isolation circuit, using tested isolation circuit to the relationship between the response rising time and the bandwidth of circuit-under-test of pulse signal, the advantage for playing pulse signal frequency characteristic achievees the purpose that the bandwidth for testing HCNR200 linear optical coupling isolation circuit.The ability of transmission high-frequency signal is isolated in reflection HCNR200 linear optical coupling device in practical applications.
Description
Technical field
The present invention be directed to the pulse testing methods of the bandwidth of HCNR200 linear optical coupling isolation circuit.Mainly for by
The actual needs for the isolation circuit transmission high-frequency signal that HCNR200 linear optical coupling is constituted, transmits the isolation circuit that device is constituted
The ability of high-frequency signal carries out test evaluation, to show that the isolation circuit of device is able to maintain that the signal frequency model of steady operation
It encloses.
Background technique
HCNR200 is a kind of typical linear optical coupling, be it is a kind of infrared light emission device and infrared optical receiving set part with
And signal processing circuit etc. is encapsulated in the device in same tube socket.Input electrical signal makes hair diode (LED) shine, light-receiving
Device receives optical signal and is converted into electric signal and exports.The conversion and output of " electrical-optical-electrical " are realized with this, light is as transmission
Medium, realize the electrical isolation of input terminal and output end, thus HCNR200 Linear optocoupler there is signal unidirectionally to input,
The features such as input/output terminal electrical isolation, strong antijamming capability, high transmission efficiency.Compared with common optical coupler, HCNR200 linear light
Coupling increase has light to receive feed circuit, can be with the size of feedback regulation input signal, therefore has input and output in a linear relationship
The characteristics of, the analog voltage of consecutive variations can be exported.
HCNR200 linear optical coupling is widely used in signal-isolated transmission circuit due to its excellent performance.In high frequency
Bandwidth is to measure the important indicator of circuit transmission high-frequency signal ability during signal-isolated transmission.Bandwidth refers to HCNR200
The intrinsic passband of linear optical coupling isolation transmission circuit, i.e. output power of circuit reduce the pervious frequency bandwidth of half.Bandwidth
Characterization isolation circuit is capable of the signal frequency range of steady operation.
The isolation circuit bandwidth test of linear optocoupler, what is applied at present is sweep check method, is mainly divided following
Step carries out:
(1) isolation circuit of HCNR200 linear optical coupling is connected under special environmental condition；
(2) regulation amplitude, the sinusoidal signal of frequency is added in isolation circuit input terminal, it is defeated with oscillograph test isolation circuit
The voltage peak-to-peak value of signal is denoted as V outmax；
(3) frequency for increasing input signal, makes the amplitude of output signal become 0.7Vmax, the frequency of signal is denoted as at this time
f1, the as bandwidth of the isolation circuit of HCNR200 linear optical coupling.
By the above testing procedure it can be found that sweep check method needs an additional swept signal source, and frequency sweep is needed to believe
The bandwidth in number source is 10 times or more of isolation circuit bandwidth to be measured.The bandwidth of HCNR200 linear optical coupling isolation circuit is
1.5MHz, it is therefore desirable to which the bandwidth of swept signal source proposes higher requirement in 15MHz or more, to swept signal source.Simultaneously
Frequency sweep method needs the signal of repeatedly input different frequency, and test process is relatively complicated.
Therefore the present invention proposes the pulse test method for being directed to HCNR200 linear optical coupling isolation circuit.High frequency is not needed
Swept signal source, but strobe pulse signal source；Do not need the input signal of multiple additional different frequency, but an additional arteries and veins
Input signal is rushed, while analyzing the response curve of the output of isolation circuit and the relationship of bandwidth just obtains the bandwidth of isolation circuit,
So that test is simpler convenient, low in cost.
Summary of the invention
1) purpose
The object of the present invention is to provide a kind of pulse test sides of bandwidth for HCNR200 linear optical coupling isolation circuit
Method obtains the bandwidth of HCNR200 linear optical coupling isolation circuit, i.e. linear optical coupling isolation circuit can be with the frequency model of steady operation
It encloses, thus transmittability of the accurate response HCRNR200 linear optical coupling isolation circuit for high-frequency signal.
2) technical solution
The present invention is a kind of pulse test method of bandwidth for HCNR200 linear optical coupling isolation circuit, and step is such as
Under:
Step 1: selection HCNR200 linear optical coupling isolation circuit is simultaneously configured；
First search the isolation circuit in HCNR200 linear optical coupling databook, the inexpensive analogue type isolation electricity of selection high speed
Road；
Then the isolation circuit of selection is configured；Protracting circuit structure chart simultaneously makes the inexpensive analogue type isolation of high speed
The printed circuit board (i.e. PCB circuit board) of circuit；Resistance, triode and HCNR200 linear optical coupling are welded to PCB circuit board
On；The HCNR200 linear optical coupling is dual-inline package (i.e. DIP8), the collector of 1 connecting triode Q2N3904 of pin；
Pin 2 connects 5V DC voltage source；Pin 3 connects R1 resistance, and the resistance value of R1 is 68K Ω；Pin 4,5 connects ground wire；Pin 6 connects
Connect the base stage of triode Q2N3906；Pin 7,8 is vacant；
Step 2: test macro used in test isolation circuit bandwidth is built；The test macro by pulse signal source,
HCNR200 linear optical coupling isolation circuit, oscillograph, 5V voltage source and computer composition；
The wherein signal output end connection of the input terminal and pulse signal source of isolation circuit to be measured, the output of pulse signal source
The channel probe of end connection oscillograph, the two channels probe of the output end connection oscillograph of isolation circuit to be measured, general-purpose interface
Bus (i.e. GPIB) connects clock and computer, and GPIB line connects oscillograph and computer；Using 5V voltage source to isolation electricity
Road powers so that they can work normally；
Step 3: bandwidth test is carried out to HCNR200 linear optical coupling isolation circuit；Pulse signal source parameter is adjusted first,
Then clock is adjusted to signal and exports (output) state, made pulse signal by isolation circuit to be measured, use oscillograph
Collect the input signal of isolation circuit and the response signal waveform of isolation circuit；
Wherein signal source regulative mode manually adjusts and computer regulated two ways:
Manually adjust: the rising time that pulse signal is arranged (according to the ability of pulse signal source, rises within 10ns
It is the smaller the better along the time), pulse width 10us, delay time 5us, starting amplitude are 0V, the selection gist of highest amplitude
Voltage range as defined in HCNR200 linear optical coupling databook, setting pulse signal highest amplitude are 5V；
Computer regulated: realizing control of the computer to pulse signal source using generic command (i.e. IEEE488.2 instruction),
Parameter is inputted on interactive interface makes the rising time of pulse signal within 10ns, pulse width 10us, when delay
Between be 5us, starting amplitude is 0V, voltage range as defined in the selection gist HCNR200 linear optical coupling databook of highest amplitude,
Setting pulse signal highest amplitude is 5V, control clock output；
Step 4: HCNR200 linear optical coupling isolation circuit bandwidth test data is handled and is analyzed；For step 3
The response curve of the middle collected isolation circuit of oscillograph chooses response signal amplitude and rises to time note corresponding when 10%
For t1, the amplitude time corresponding when rising to 90% is denoted as t2；
Be tested HCNR200 linear optical coupling isolation circuit is to the response rising time of pulse signal
τr=t2-t1
In formula: τrTo be tested HCNR200 linear optical coupling isolation circuit to the response rising time of pulse signal；
When pulse signal passes through HCNR200 linear optical coupling isolation circuit, become since the loss of high fdrequency component generates waveform
Change and be embodied on response curve rising time, by the transformational analysis of time domain and frequency domain, responds rising time and circuit
Bandwidth have following relationship:
In formula:
B is the isolation circuit bandwidth of HCNR200 linear optical coupling device；
It can thus be concluded that the bandwidth of HCNR200 linear optical coupling isolation circuit；
By above step, when using HCNR200 linear optical coupling isolation circuit to the response signal rising edge of pulse signal
Between relationship between the bandwidth of circuit, play the advantage of pulse signal frequency characteristic, reached test HCNR200 linear optical coupling
The purpose of the bandwidth of isolation circuit；The signal of transmission can be isolated in practical application for test HCNR200 linear optical coupling
Frequency range has important reference significance；The present invention does not need external high-frequency signal source for sweep check to produce
Raw high_frequency sine wave signal, but tested using pulse signal source, testing cost can be saved；Multiple frequency sweep is replaced to obtain
The complex steps of the bandwidth of HCNR200 linear optical coupling isolation circuit, by the input of pulsatile once signal and a response signal
Analysis can obtain the bandwidth of HCNR200 linear optical coupling isolation circuit, it is simpler convenient.
3) advantage and effect
The present invention provides a kind of pulse testing method of bandwidth for HCNR200 linear optical coupling isolation circuit.The invention
Advantage is: for sweep check, not needing external high-frequency signal source to generate high_frequency sine wave signal, but uses arteries and veins
It rushes signal source to be tested, testing cost can be saved；Multiple frequency sweep is replaced to obtain the band of HCNR200 linear optical coupling isolation circuit
Wide complex steps can obtain HCNR200 linear light by the input of pulsatile once signal and the analysis of a response signal
The bandwidth of coupling isolation circuit is simpler convenient.
Detailed description of the invention
The inexpensive analogue type isolation circuit of Fig. 1 HCNR200 high speed.
Fig. 2 the method for the invention flow chart.
Fig. 3 present invention tests connection figure.
Fig. 4 pulse signal source setting of the present invention.
Symbol code name is described as follows in figure:
Vcc1It is 5V voltage source
Vcc2It is 5V voltage source
VinIt is pulse signal
VoutIt is the response signal of HCNR200 linear optical coupling isolation circuit
LED is light emitting diode
PD1 is photodiode
PD2 is photodiode
R1-R7 is resistance
Q1-Q4 is triode
Specific implementation method
Test method described in the invention is tested by taking the HCNR200 linear optical coupling that TI company produces as an example.Selection
Pulse signal source be Keysight company production 33500B series waveform generator, circuit-under-test is HCNR200 linear light
The high speed low cost analogue type isolation circuit (as shown in Figure 1) of coupling, oscillograph use the TBS2000 model oscillography of Imtech
Device.
The present invention is a kind of pulse test method of bandwidth for HCNR200 linear optical coupling isolation circuit, flow chart
As shown in Fig. 2, its specific implementation step is as follows:
Step 1: selection HCNR200 linear optical coupling isolation circuit is simultaneously configured.
Search the isolation circuit in HCNR200 databook, the inexpensive analogue type isolation circuit of selection high speed.It uses
Altium Designer Software on Drawing circuit diagram simultaneously makes pcb board, includes triode, resistance and line by required component
Property optocoupler HCNR200 be welded on pcb board, pin 1 connects the collector of Q2N3904；Pin 2 connects 5V DC power supply；Pipe
Foot 3 connects R1 resistance, and R1 resistance value is 68K Ω；Pin 4,5 connects ground wire；The base stage of the connection of pin 6 Q2N3906；Pin 7,8 is empty
It sets.
Step 2: test macro used in test isolation circuit bandwidth is built.Test macro is believed by 33500B series of pulses
Number source, HCNR200 linear optical coupling isolation circuit, the oscillograph of TBS2000 model, 5V voltage source and computer composition.
Test macro used in test isolation circuit bandwidth is built according to system shown in Figure 3 structure.Wherein isolation electricity to be measured
The input terminal on road is connect with the output end of pulse signal source 33500B, and the channel probe of TBS2000 oscillograph is isolated with to be measured
The input terminal of circuit connects, and two channels probe is connect with the output end of isolation circuit to be measured, connects 33500B pulse with GPIB line
Source and computer connect TBS2000 oscillograph and computer with GPIB line.It can to isolation circuit power supply using 5V voltage source
It is enough to work normally.
Step 3: carrying out bandwidth test to HCNR200 linear optical coupling isolation circuit, first adjusting pulse signal source parameter,
Then clock is adjusted to output state, makes pulse signal by isolation circuit to be measured, collect isolation using oscillograph
Circuit input signal and isolation circuit response signal waveform.
Pulse signal source parameter is adjusted according to method shown in Fig. 4, wherein signal source regulative mode is manually adjusted and calculated
Machine adjusts two ways.
Manually adjust: by pulse along the rise time be adjusted to 8.4ns (pulse of 33500B series of pulses signal source it is most short on
Rise the time), pulse width 10us, delay time 5us, according to voltage model as defined in HCNR200 linear optical coupling databook
It encloses, selecting starting amplitude is 0V, output amplitude 5V.
Computer regulated: computer and signal source interactive interface are produced using Labview, in Labview interactive interface
Input response parameter make pulse along the rise time be 8.4ns (33500B series of pulses signal source pulse most short rising when
Between), pulse width 10us, delay time 5us, according to voltage range as defined in HCNR200 linear optical coupling databook, choosing
Selecting starting amplitude is 0V, output amplitude 5V, and control signal source is exported.
Step 4: using the function for the reading rise time that the oscillograph of TBS2000 model has, it can be observed that isolation
The rise time of the response signal of circuit is 220.7ns.Then
τr=220.7ns
Relationship between curve rise time and circuit pass band according to response, obtains:
Then the bandwidth for obtaining the isolation circuit of HCNR200 Linear optocoupler is 1.585MHz.
Claims (3)
1. a kind of pulse test method of the bandwidth for HCNR200 linear optical coupling isolation circuit, it is characterised in that: its step is such as
Under:
Step 1: selection HCNR200 linear optical coupling isolation circuit is simultaneously configured；
First search the isolation circuit in HCNR200 linear optical coupling databook, the inexpensive analogue type isolation circuit of selection high speed；
Then the isolation circuit of selection is configured；Protracting circuit structure chart simultaneously makes the inexpensive analogue type isolation circuit of high speed
Printed circuit board, that is, PCB circuit board；Resistance, triode and HCNR200 linear optical coupling are welded in PCB circuit board；It should
HCNR200 linear optical coupling is dual-inline package, that is, DIP8, the collector of 1 connecting triode Q2N3904 of pin；Pin 2 connects
Connect 5V DC voltage source；Pin 3 connects R1 resistance；Pin 4,5 connects ground wire；The base stage of 6 connecting triode Q2N3906 of pin；Pipe
Foot 7,8 is vacant；
Step 2: test macro used in test isolation circuit bandwidth is built；The test macro is by pulse signal source, HCNR200
Linear optical coupling isolation circuit, oscillograph, 5V voltage source and computer composition；
Wherein the signal output end connection of the input terminal and pulse signal source of isolation circuit to be measured, the output end of pulse signal source connect
Connect the channel probe of oscillograph, the two channels probe of the output end connection oscillograph of isolation circuit to be measured, general purpose interface bus
That is GPIB connection clock and computer, GPIB line connect oscillograph and computer；It is powered using 5V voltage source to isolation circuit
So that they can work normally；
Step 3: bandwidth test is carried out to HCNR200 linear optical coupling isolation circuit；Pulse signal source parameter is adjusted first, then
Clock is adjusted to signal output state, makes pulse signal by isolation circuit to be measured, collects isolation electricity using oscillograph
The input signal on road and the response signal waveform of isolation circuit；
Step 4: HCNR200 linear optical coupling isolation circuit bandwidth test data is handled and is analyzed；For showing in step 3
The response curve of the collected isolation circuit of wave device, selection response signal amplitude time corresponding when rising to 10% are denoted as
t1, the amplitude time corresponding when rising to 90% is denoted as t2；
Be tested HCNR200 linear optical coupling isolation circuit is to the response rising time of pulse signal
τr=t2-t1
In formula: τrTo be tested HCNR200 linear optical coupling isolation circuit to the response rising time of pulse signal；
When pulse signal passes through HCNR200 linear optical coupling isolation circuit, since the loss of high fdrequency component generates waveform variation simultaneously
It is embodied on response curve rising time, by the transformational analysis of time domain and frequency domain, responds the band of rising time and circuit
Width has following relationship:
In formula: B is the isolation circuit bandwidth of HCNR200 linear optical coupling device；
Thus the bandwidth of HCNR200 linear optical coupling isolation circuit is obtained；
By above step, using HCNR200 linear optical coupling isolation circuit to the response signal rising time of pulse signal with
Relationship between the bandwidth of circuit plays the advantage of pulse signal frequency characteristic, has reached test HCNR200 linear optical coupling isolation
The purpose of the bandwidth of circuit；Test HCNR200 linear optical coupling can be isolated in practical application the frequency of the signal of transmission
Range has important reference significance；The present invention does not need external high-frequency signal source for sweep check to generate height
Frequency sine-wave signal, but tested using pulse signal source, testing cost can be saved；Multiple frequency sweep is replaced to obtain
The complex steps of the bandwidth of HCNR200 linear optical coupling isolation circuit, by the input of pulsatile once signal and a response signal
Analysis can obtain the bandwidth of HCNR200 linear optical coupling isolation circuit, it is simpler convenient.
2. a kind of pulse test method of bandwidth for HCNR200 linear optical coupling isolation circuit according to claim 1,
It is characterized by:
It is dual-inline package, that is, DIP8 in the HCNR200 linear optical coupling described in step 1, pin 3 connects R1 electricity
Resistance, the resistance value of the R1 are 68K Ω.
3. a kind of pulse test method of bandwidth for HCNR200 linear optical coupling isolation circuit according to claim 1,
It is characterized by:
Adjusting pulse signal source parameter described in step 3, signal source regulative mode manually adjusts and computer regulated
Two ways:
It manually adjusts: the rising time of pulse signal being set within 10ns (according to the ability of pulse signal source, when rising edge
Between it is the smaller the better), pulse width 10us, delay time 5us, starting amplitude be 0V, the selection gist of highest amplitude
Voltage range as defined in HCNR200 linear optical coupling databook, setting pulse signal highest amplitude are 5V；
Computer regulated: control of the computer to pulse signal source is realized using generic command, that is, IEEE488.2 instruction, in interaction
Parameter is inputted on interface makes the rising time of pulse signal within 10ns, pulse width 10us, and delay time is
5us, starting amplitude are 0V, voltage range as defined in the selection gist HCNR200 linear optical coupling databook of highest amplitude, setting
Pulse signal highest amplitude is 5V, control clock output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811273474.8A CN109471013A (en) | 2018-10-30 | 2018-10-30 | For the pulse testing method of the bandwidth of HCNR200 linear optical coupling isolation circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811273474.8A CN109471013A (en) | 2018-10-30 | 2018-10-30 | For the pulse testing method of the bandwidth of HCNR200 linear optical coupling isolation circuit |
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