CN104793096A - Working state detection circuit of electronic device - Google Patents
Working state detection circuit of electronic device Download PDFInfo
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- CN104793096A CN104793096A CN201510161445.2A CN201510161445A CN104793096A CN 104793096 A CN104793096 A CN 104793096A CN 201510161445 A CN201510161445 A CN 201510161445A CN 104793096 A CN104793096 A CN 104793096A
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Abstract
The invention relates to a circuit detection technology, and discloses a working state detection circuit of an electronic device. The working state detection circuit comprises a first voltage source, a sampling sub circuit and a voltage recognizing sub circuit. The input end of the sampling sub circuit is connected to the first voltage source, and the output end of the sampling sub circuit is connected to the first input end of the voltage recognizing sub circuit and the first power supply receiving end of the electronic device. The output end of the sampling sub circuit outputs sampled voltages; the voltage recognizing sub circuit outputs voltage recognition signals according to the sampled voltages; the voltage recognition signals indicate the working state of the electronic device. The working state detection circuit for the electronic device can monitor the working state of the electronic device in real time to determine disconnection of the electronic device and is simple to produce, accurate in detection and low in cost.
Description
Technical field
The present invention relates to electric circuit inspection technology, particularly a kind of Working state checking circuit of electron device.
Background technology
In in powerful frequency converter, require very high to the precision, error, response time etc. detecting electric current, generally select Closed Loop Hall.Its principle of work is magnetic balance type, i.e. the magnetic field that produces of primary current, and the magnetic field produced by the electric current of a secondary coil is compensated, and makes hall device be in the duty detecting Zero flux all the time.When the magnetic field that former secondary offset current produces reaches balance in magnetic core, and when the former limit of known sensor and the secondary coil number of turn, by measuring the size of secondary offset current IM, the value of primary current IN can be extrapolated, thus achieve the isolation measurement of primary current.
But if Hall element and external interface line break in using, namely Hall element is in improper duty, and frequency converter because doing to current system conditions error in judgement the control made mistake, thus can cause larger loss.Existing testing circuit there is no method and simply detects whether Closed Loop Hall breaks.
Summary of the invention
The object of the present invention is to provide a kind of Working state checking circuit of electron device, can the duty of Real-Time Monitoring electron device to determine whether it breaks, realize simple, to detect accurately and cost is lower.
For solving the problems of the technologies described above, embodiments of the present invention provide a kind of Working state checking circuit of electron device, comprise: the first voltage source, sampling electronic circuit and voltage identification electronic circuit, the input end of described sampling electronic circuit is connected to described first voltage source, the output terminal of described sampling electronic circuit is connected to the first input end of described voltage identification electronic circuit and the first power supply receiving end of electron device, and the output terminal of described sampling electronic circuit exports sampled voltage; Described voltage identification electronic circuit is according to described sampled voltage output voltage identification signal, and wherein, described voltage identification signal represents the duty of described electron device.
Embodiment of the present invention in terms of existing technologies, the output terminal of described sampling electronic circuit is connected to the first input end of described voltage identification electronic circuit and the first power supply receiving end of electron device, the output terminal of described sampling electronic circuit exports sampled voltage, the sampled voltage output voltage identification signal that described voltage identification electronic circuit exports according to described sampling electronic circuit, described voltage identification signal represents the duty of described electron device.Thus, Working state checking circuit can the duty of Real-Time Monitoring electron device to determine whether it breaks, realize simple, to detect accurately and cost is lower.
In addition, the Working state checking circuit of described electron device also comprises the second voltage source, described second voltage source is connected to the second source receiving end of described electron device, and wherein, the voltage swing that described second voltage source and described first voltage source provide is equal and direction is contrary; Described second voltage source is connected to the second source receiving end of described electron device by a sectional pressure element.Thus, be connected to the first voltage source corresponding with the sectional pressure element of the second voltage source, operating voltage electron device being had comparatively balance.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the Working state checking circuit according to first embodiment of the invention electron device;
Fig. 2 is the circuit diagram of the Working state checking circuit according to second embodiment of the invention electron device;
Fig. 3 is the circuit diagram of the Working state checking circuit according to third embodiment of the invention electron device;
Fig. 4 is the circuit diagram of the Working state checking circuit according to four embodiment of the invention electron device.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, the embodiments of the present invention are explained in detail.But, persons of ordinary skill in the art may appreciate that in each embodiment of the present invention, proposing many ins and outs to make reader understand the application better.But, even without these ins and outs with based on the many variations of following embodiment and amendment, each claim of the application technical scheme required for protection also can be realized.
First embodiment of the present invention relates to a kind of Working state checking circuit of electron device, and wherein this electron device is Closed Loop Hall; But the concrete kind of present embodiment to electron device does not impose any restrictions.As shown in Figure 1, Working state checking circuit mainly comprise the first voltage source V+, sampling electronic circuit 10, reference voltage electronic circuit 11 and voltage identification electronic circuit 12.The input end P of sampling electronic circuit 10
10-1be connected to the first voltage source V+, sampling electronic circuit 10 output terminal P
10-2be connected to the first input end P of voltage identification electronic circuit 12
12-1, the output terminal P of sampling electronic circuit 10
10-2also for being connected to the first power supply receiving end of Closed Loop Hall.The input end P of reference voltage electronic circuit 11
11-1be connected to the first voltage source V+, the output terminal P of reference voltage electronic circuit 11
11-2be connected to the second input end P of voltage identification electronic circuit 12
12-2.
In present embodiment, sampling electronic circuit 10 comprises a sectional pressure element and a protective resistance R1.This sectional pressure element is such as diode D1, and the positive pole of diode D1 and negative pole are respectively the input end P of sampling electronic circuit 10
10-1with output terminal P
10-2, the negative pole of diode D1 exports sampled voltage V
s.Protective resistance R1 is parallel to the two poles of the earth of diode D1, and when damaging to prevent diode, Working state checking circuit cannot work.
Preferably, Working state checking circuit also comprises resistance R3, and resistance R3 two ends are connected to negative pole (the output terminal P of electronic circuit 10 of namely sampling of diode D1
10-2) with the first input end P of voltage identification electronic circuit 12
12-1, wherein, resistance R3 plays impedance matching effect.
Preferably, Working state checking circuit also comprises electric capacity C1, and the two ends of electric capacity C1 are connected to the first input end P of voltage identification electronic circuit 12
12-1with earth terminal, wherein, electric capacity C1 strobes.
In present embodiment, reference voltage electronic circuit 11 comprises resistance R4, resistance R5 and electric capacity C2.The first end of resistance R4 and the second end are respectively the input end P of reference voltage electronic circuit 11
11-1with output terminal P
11-2.That is, the first end of resistance R4 and the second end be connected to the first voltage source V+with the second input end P of voltage identification electronic circuit 12
12-2.The first end of resistance R5 is connected to second end of resistance R4, the second end ground connection of resistance R5; Electric capacity C2 is also connected to the two ends of resistance R5.The output terminal P of reference voltage electronic circuit 11
11-2output reference voltage V
rto voltage identification electronic circuit 12.
In present embodiment, voltage identification electronic circuit 12 comprises comparer U1, resistance R2, pull-up power supply VCC and comparer working power VDD.The inverting input of comparer U1 and in-phase input end are respectively the first input end P of voltage identification electronic circuit 12
12-1with the second input end P
12-2; The output terminal of comparer U1 is the output terminal P of voltage identification electronic circuit 12
12-3, for output voltage identification signal BK_HALL.The output terminal of comparer U1 is connected to pull-up power supply VCC by resistance R2; The working power pin of comparer U1 is connected to comparer working power VDD.Wherein, the concrete numerical value of resistance R2, pull-up power supply VCC and comparer working power VDD sets according to the normal need of work of comparer U1.
Preferably, Working state checking circuit also comprises electric capacity C3, and the two ends of electric capacity C3 are connected to output terminal and the earth terminal of comparer U1, and wherein, electric capacity C3 strobes.But the specific implementation of present embodiment to voltage identification electronic circuit does not impose any restrictions, voltage identification electronic circuit can also be made up of other electron device, as long as can realize the recognition function to sampled voltage.
In present embodiment, Working state checking circuit also comprise the second voltage source V-, the second source receiving end of the second voltage source V-be connected to Closed Loop Hall.Wherein, the second voltage source V-equal with the voltage swing of the first voltage source V+provide and direction is contrary.
Preferably, Working state checking circuit also comprises a sectional pressure element, the second source receiving end of the second voltage source V-be connected to by this sectional pressure element Closed Loop Hall.This sectional pressure element be such as the negative pole of diode D2, diode D2 be connected to the second voltage source V-, the positive pole of diode D2 is connected to the second source receiving end of Closed Loop Hall.Wherein, diode D2 and diode D1 forms corresponding relation, that is, it is after-applied in first, second power supply receiving end of Closed Loop Hall that the voltage that the first voltage source and the second voltage source export produces same pressure drop, thus operating voltage Closed Loop Hall being had comparatively balance.
In present embodiment, Working state checking circuit also comprises a plug-in unit CN1, the output terminal P of sampling electronic circuit 10
10-2(negative pole of diode D1) is integrated in plug-in unit CN1 with the positive pole of diode D2, and Working state checking circuit is connected to Closed Loop Hall by this plug-in unit CN1.Thus, make the connection between Working state checking circuit and Closed Loop Hall convenient.
The following is the specification in conjunction with related elements, illustrate the principle of work of the Working state checking circuit of present embodiment.But the component specification of present embodiment to the following stated does not impose any restrictions, and is only and illustrates.
In present embodiment, the measurement range of Closed Loop Hall is ± 800A, and power supply is ± 15V, and when Closed Loop Hall normally works, electrical source consumption electric current is 20mA ~ 120mA.That is, the voltage of the first voltage source V+provide is set to+15V, and the voltage of the second voltage source V-provide is set to-15V.Comparer working power VDD is set to+24V, and pull-up power supply VCC is set to+5V.The resistance of resistance R2 is set to 3k Ω, and the resistance of resistance R4 is set to 100 Ω, and the resistance of resistance R5 is set to 10k Ω.The model of diode D1 is SS14, and comparer U1 model is LM393ADRG3.
Then, reference voltage V
rfor:
When the duty of Closed Loop Hall is normal, the electric current flowing through diode D1 is 20mA ~ 120mA, and now according to the specifications of the model SS14 of diode D1, its pressure drop is 0.27V ~ 0.37V.
Then, sampled voltage V
sthere is the first partial pressure value: V
s=(V+)-V
1=15-V
1∈ (14.67,14.77), wherein, this first partial pressure value is essentially a partial pressure range.
Now, V
s<V
r(inverting input of comparer U1 receives sampled voltage V
s, the in-phase input end of comparer U1 receives reference voltage V
r), therefore, the voltage identification signal BK_HALL that comparer U1 exports is high level, represents that Closed Loop Hall is in normal duty.
When the duty of Closed Loop Hall is improper, namely Closed Loop Hall cannot work because of broken string, and the electric current now flowing through diode D1 is about 0, and namely diode D1 does not produce pressure drop;
Then, sampled voltage V
sthere is the second partial pressure value: V
s=V+=15V.
Now, V
s>V
r, therefore, the voltage identification signal BK_HALL that comparer U1 exports is low level, and represent that Closed Loop Hall is in improper duty, namely Closed Loop Hall cannot work because of broken string.
Present embodiment does not impose any restrictions for above-mentioned judgment mode; In other embodiment, when the in-phase input end of comparer U1 and inverting input are respectively the first input end P of voltage identification electronic circuit 12
12-1with the second input end P
12-2time, that is, the in-phase input end of comparer U1 receives reference voltage V
r, the inverting input of comparer U1 receives sampled voltage V
sthen, voltage identification signal BK_HALL represents when being low level that Closed Loop Hall is in normal duty, represents that Closed Loop Hall is in improper duty (Closed Loop Hall broken string) when voltage identification signal BK_HALL is high level.
Second embodiment of the present invention relates to a kind of Working state checking circuit of Closed Loop Hall, as shown in Figure 2.Second embodiment is roughly the same with the first embodiment, key distinction part is: in second embodiment of the invention, sampling electronic circuit only comprises a divider resistance R6, and the two ends of this divider resistance R6 are respectively input end and the output terminal of this sampling electronic circuit.Wherein, this divider resistance is ohm level, and its concrete numerical value can set according to actual needs.
3rd embodiment of the present invention relates to a kind of Working state checking circuit of Closed Loop Hall, as shown in Figure 3.3rd embodiment is roughly the same with the first embodiment, and key distinction part is: in third embodiment of the invention, and Working state checking circuit omits electric capacity C1, C3 and resistance R3; Sampling electronic circuit 10 only comprises a sectional pressure element, and this sectional pressure element is such as diode D1; Voltage identification electronic circuit 12 comprises differential amplification unit 121 and triode Q1, the in-phase input end of differential amplification unit 121 and inverting input are respectively first input end and second input end of voltage identification electronic circuit 12, the output terminal of differential amplification unit 121 is connected to the base stage of triode Q1, the output terminal of the current collection of triode Q1 very voltage identification electronic circuit.
Specifically, voltage identification electronic circuit 12 comprises operational amplifier U2, comparer working power VDD and resistance R7, R8, R9, R10.One end of resistance R7 is connected to the in-phase input end of operational amplifier U2 and the other end is the first input end of voltage identification electronic circuit 12; One end of resistance R8 is connected to the inverting input of operational amplifier U2 and the other end is the second input end of voltage identification electronic circuit 12; Between the inverting input that resistance R9 is connected across operational amplifier U2 and output terminal; The in-phase input end of operational amplifier U2 is also by resistance R10 ground connection; The working power pin of operational amplifier U2 is connected to comparer working power VDD.In actual, voltage identification electronic circuit 12 also comprises pull-up power supply VCC and resistance R11, and the collector of triode Q1 is connected to pull-up power supply VCC by resistance R11, the grounded emitter of triode Q1.
Each resistance value in present embodiment is as follows, R7=R8=10K Ω, R9=R10=100K Ω, R11=3K Ω, and wherein, R7, R8, R9, R10 and U2 constitute typical differential amplifier circuit; Then, the output voltage of differential amplification unit 121 is:
but the value of present embodiment to each resistance does not impose any restrictions, and those skilled in the art can set according to actual needs.Specific works process is as follows:
When the duty of Closed Loop Hall is normal: diode D1 normally, and pressure drop is 0.27V ~ 0.37V;
Sampled voltage V
sthere is the first partial pressure value: V
s=(V+)-V
1=15-V
1∈ (14.67,14.77), wherein, this first partial pressure value is essentially a partial pressure range.
Now, V
s<V
r(in-phase input end of differential amplification unit 121 receives sampled voltage V
s, the inverting input of differential amplification unit 121 receives reference voltage V
r, wherein, reference voltage V
rfor:
), that is, the differential input voltage of differential amplification unit 121 is: Δ V=V
s-V
r=∈ (-0.18 ,-0.08)
Because operational amplifier U2 is single power supply, can not export negative pressure, now the output voltage of differential amplification unit 121 is: V
o=0, then triode Q1 not conducting; The voltage identification signal BK_HALL that the collector of triode Q1 exports is pulled upward to VCC by resistance R11, exports high level, represents that Closed Loop Hall is in normal duty.
When the duty of Closed Loop Hall is improper, D1 does not have electric current to flow through substantially, and pressure drop is almost 0;
Sampled voltage V
sthere is the second partial pressure value: V
s=V+=15V;
Now, V
s>V
r, namely the differential input voltage of differential amplification unit 121 is: Δ V=V
s-V
r=0.15V;
Thus the output voltage of differential amplification unit 121 is:
that is, the output voltage V of the differential amplification unit 121 received due to the base stage of triode Q1
obe greater than the forward voltage 0.7V of triode Q1, triode Q1 conducting.Therefore, the voltage identification signal BK_HALL that the collector of triode Q1 exports is pulled down to ground by triode Q1, output low level, and represent that Closed Loop Hall is in improper duty, namely Closed Loop Hall cannot work because of broken string.
4th embodiment of the present invention relates to a kind of Working state checking circuit of Closed Loop Hall, as shown in Figure 4.4th embodiment is roughly the same with the 3rd embodiment, and key distinction part is: in four embodiment of the invention, and Working state checking circuit eliminates reference voltage electronic circuit; The inverting input of differential amplification unit 121 is the first input end of voltage identification electronic circuit 12, and the in-phase input end of differential amplification unit 121 is the second input end of voltage identification electronic circuit 12 and is connected to the input end (i.e. the positive pole of diode D1) of sampling electronic circuit 11.
Each resistance value in present embodiment is as follows, R7=R8=10K Ω, R9=R10=30K Ω, R11=3K Ω, and wherein, R7, R8, R9, R10 and U2 constitute typical differential amplifier circuit; Then, the output voltage of differential amplification unit 121 is:
but the value of present embodiment to each resistance does not impose any restrictions, and those skilled in the art can set according to actual needs.Specific works process is as follows:
When the duty of Closed Loop Hall is normal: diode D1 normally, and pressure drop is 0.27V ~ 0.37V, and namely the differential input voltage of differential amplification unit 121 is: Δ V ∈ (0.27,0.37)
Then, the minimum output voltage of differential amplification unit 121 is:
due to the output voltage V of the differential amplification unit 121 that the base stage of triode Q1 receives
obe greater than the forward voltage 0.7V of triode Q1, triode Q1 conducting.Therefore, the voltage identification signal BK_HALL that the collector of triode Q1 exports is pulled down to ground by triode Q1, exports as low level, represents that Closed Loop Hall is in normal duty.
When the duty of Closed Loop Hall is improper: D1 does not have electric current to flow through substantially, and pressure drop is almost 0, the differential input voltage of differential amplification unit 121 is Δ V=0;
Now, the maximum output voltage of differential amplification unit 121 is V
o(max) 0.7V is far smaller than, triode Q1 not conducting.Therefore, the voltage identification signal BK_HALL that the collector of triode Q1 exports is pulled upward to VCC by resistance R11, exports as high level, and represent that Closed Loop Hall is in improper duty, namely Closed Loop Hall cannot work because of broken string.
Persons of ordinary skill in the art may appreciate that the respective embodiments described above realize specific embodiments of the invention, and in actual applications, various change can be done to it in the form and details, and without departing from the spirit and scope of the present invention.
Claims (11)
1. a Working state checking circuit for electron device, is characterized in that, comprises:
First voltage source, sampling electronic circuit and voltage identification electronic circuit, the input end of described sampling electronic circuit is connected to described first voltage source, the output terminal of described sampling electronic circuit is connected to the first input end of described voltage identification electronic circuit and the first power supply receiving end of electron device, and the output terminal of described sampling electronic circuit exports sampled voltage;
Described voltage identification electronic circuit is according to described sampled voltage output voltage identification signal, and wherein, described voltage identification signal represents the duty of described electron device.
2. the Working state checking circuit of electron device according to claim 1, it is characterized in that, described Working state checking circuit also comprises reference voltage electronic circuit, the input end of described reference voltage electronic circuit is connected to described first voltage source, the output terminal of described reference voltage electronic circuit is connected to the second input end of described voltage identification electronic circuit, the output terminal output reference voltage of described reference voltage electronic circuit, described voltage identification electronic circuit exports described voltage identification signal according to described sampled voltage and described reference voltage.
3. the Working state checking circuit of electron device according to claim 2, it is characterized in that, when the duty of described electron device is normal, described sampled voltage has the first partial pressure value, when the duty of described electron device is improper, described sampled voltage has the second partial pressure value, and described reference voltage is greater than described first partial pressure value and is less than described second partial pressure value.
4. the Working state checking circuit of electron device according to claim 3, it is characterized in that, described voltage identification electronic circuit comprises comparer, the inverting input of described comparer and in-phase input end are respectively first input end and second input end of described voltage identification electronic circuit, and the output terminal of described comparer is the output terminal of described voltage identification electronic circuit;
When the duty of described electron device is normal, described voltage identification signal is high level, and when the duty of described electron device is improper, described voltage identification signal is low level.
5. the Working state checking circuit of electron device according to claim 3, is characterized in that,
Described voltage identification electronic circuit comprises differential amplification unit and triode, the in-phase input end of described differential amplification unit and inverting input are respectively first input end and second input end of described voltage identification electronic circuit, the output terminal of described differential amplification unit is connected to the base stage of described triode, the output terminal of the very described voltage identification electronic circuit of current collection of described triode;
When the duty of described electron device is normal, described voltage identification signal is high level, and when the duty of described electron device is improper, described voltage identification signal is low level.
6. the Working state checking circuit of electron device according to claim 1, is characterized in that,
The input end of described sampling electronic circuit is also connected to the second input end of described voltage identification electronic circuit;
Described voltage identification electronic circuit comprises differential amplification unit and triode, the inverting input of described differential amplification unit and in-phase input end are respectively first input end and second input end of described voltage identification electronic circuit, the output terminal of described differential amplification unit is connected to the base stage of described triode, the output terminal of the very described voltage identification electronic circuit of current collection of described triode;
When the duty of described electron device is normal, described voltage identification signal is low level, and when the duty of described electron device is improper, described voltage identification signal is high level.
7. the Working state checking circuit of electron device as claimed in any of claims 1 to 6, is characterized in that, described sampling electronic circuit comprises a sectional pressure element, and the two ends of described sectional pressure element are respectively input end and the output terminal of described sampling electronic circuit.
8. the Working state checking circuit of electron device according to claim 7, is characterized in that, described sectional pressure element is diode, and the positive pole of described diode and negative pole are respectively input end and the output terminal of described sampling electronic circuit.
9. the Working state checking circuit of electron device according to claim 7, is characterized in that, described sectional pressure element is divider resistance.
10. the Working state checking circuit of electron device according to claim 1, it is characterized in that, the Working state checking circuit of described electron device also comprises the second voltage source, described second voltage source is connected to the second source receiving end of described electron device, wherein, the voltage swing that provides of described second voltage source and described first voltage source is equal and direction is contrary.
The Working state checking circuit of 11. electron devices according to claim 10, is characterized in that, described second voltage source is connected to the second source receiving end of described electron device by a sectional pressure element.
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|---|---|---|---|
| CN201510161445.2A CN104793096A (en) | 2015-04-07 | 2015-04-07 | Working state detection circuit of electronic device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510161445.2A CN104793096A (en) | 2015-04-07 | 2015-04-07 | Working state detection circuit of electronic device |
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ID=53558066
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Application publication date: 20150722 |