CN201583604U - Portable electrical measurement device with diode testing functions - Google Patents
Portable electrical measurement device with diode testing functions Download PDFInfo
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- CN201583604U CN201583604U CN 200920157851 CN200920157851U CN201583604U CN 201583604 U CN201583604 U CN 201583604U CN 200920157851 CN200920157851 CN 200920157851 CN 200920157851 U CN200920157851 U CN 200920157851U CN 201583604 U CN201583604 U CN 201583604U
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Abstract
A portable electrical measurement device with diode testing functions comprises at least one of a voltage measurement circuit, a current measurement circuit and a resistance measurement circuit, and further comprises a circuit for testing diodes at one step. The circuit for testing diodes at one step comprises an alternating current signal generating circuit, a connecting component and a diode testing circuit, wherein the alternating current signal generating circuit utilizes direct current signals to generate alternating currents, the connecting component comprises a first contact and a second contact which are respectively connected with two leads of a to-be-tested diode, an output end of the alternating current signal generating circuit is connected with the first contact and the second contact so as to apply the alternating current signals onto the first contact and the second contact, and the diode testing circuit is connected with the first contact and the second contact so as to detect performance of the to-be-tested diode which is connected to the first contact and the second contact. The portable electrical measurement device adopts the alternating current signals to test diodes, can complete test of the diodes with a single step, and then brings more convenience to use.
Description
[technical field]
The application's one side is relevant a kind of portable electrical measurement with diode test function.
[technical background]
Multimeter is a kind of electronic measuring instrument that integrates multiple function, is widely used in measuring electric parameters such as electric current, voltage, resistance, electric capacity, electricity frequency.
Also not having at present can pacing amount diode (especially light emitting diode) polarity or the multimeter of forward voltage.Utilize existing multimeter to need two steps just can detect the polarity of diode: at first, resistance test shelves at multimeter, the anodal probe pen of multimeter is contacted with first pin of diode, the negative pole probe pen of multimeter is contacted with second pin of diode, record one first resistance value; Then, the anodal probe pen of multimeter is contacted with second pin of diode, the negative pole probe pen of multimeter is contacted with first pin of diode, record one second resistance value.If first resistance value is less than second resistance value, first pin is the negative pole of diode so, and greater than second resistance value, second pin is the negative pole of diode so as if first resistance value.The polarity of utilizing existing multimeter test diode is comparatively complicated, same, utilizes the forward voltage of existing multimeter measuring diode can't guarantee that also a step finishes measurement.
Because the specialized equipment of test diode is comparatively expensive and not portable, and except polarity test and forward voltage measurement, most of general users do not need other test functions of these specialized equipments.Therefore, be necessary to provide a kind of can a pacing amount diode polarity or/and the portable electrical measurement of forward voltage.
[utility model content]
The application's one side is relevant a kind of portable electrical measurement with diode test function, especially about a kind of portable electrical measurement, especially about a kind of portable electrical measurement with function of step detection light emitting diode with function of step detection diode.
Portable electrical measurement has voltage measurement, resistance measurement and current measurement function one of at least.
Further, portable electrical measurement has voltage measurement, resistance measurement and current measurement function.
The inventor finds if detect the polarity or the forward voltage of diode with direct current signal, because the unilateral conduction of diode, may need to carry out twice test and could obtain the result, wherein, in this twice test, respectively measured diode is connected in testing circuit by reverse direction.In the application's one side, the inventor adopts the alternating current signal detection diode.Because AC signal comprises positive signal part and negative signal part, no matter measured diode is connected in testing circuit with what direction, in the normal prerequisite of measured diode just, must there be one in this two parts of signals and can forms the loop by measured diode, therefore, pacing examination diode becomes possibility.
The application's one side provides a kind of portable electrical measurement, comprises that tension measuring circuit, current measurement circuit and resistance measuring circuit are one of at least.Portable electrical measurement also comprises the circuit of step detection diode, and this circuit comprises: AC signal generating circuit, utilize direct current signal to produce AC signal; Coupling assembling comprises first contact and second contact, is respectively applied for two pins that connect measured diode, and wherein, the output terminal of AC signal generating circuit is connected with this first contact and second contact AC signal is put on this first contact and second contact; And the diode test circuit, be connected with first contact and second contact, be connected in the measured diode of first contact and second contact with detection.Coupling assembling is the web member that measured diode is connected to diode detecting circuit, and it comprises that two are respectively applied for the contact that connects the measured diode pin.
In one embodiment, the diode test circuit is a polarity detection circuit, itself and coupling assembling and AC signal generating circuit output terminal polyphone.In one embodiment, polarity detection circuit comprises: the first unidirectional turning circuit is connected with first light-emitting component on this first unidirectional turning circuit; And the second unidirectional turning circuit, be connected with second light-emitting component on this second unidirectional turning circuit, wherein, this first unidirectional turning circuit and this second unidirectional turning circuit reverse parallel connection.In one embodiment, first light-emitting component and second light-emitting component are light emitting diode.
In another embodiment, the diode test circuit is the forward voltage metering circuit, and it is in parallel with coupling assembling, the pressure drop when being connected in the measured diode forward conduction of first contact and second contact with measurement between first contact and second contact.In one embodiment, the forward voltage metering circuit comprises filtering circuit, to eliminate because of the influence to the forward voltage measurement of the electric signal of measured diode open circuit.Further, in one embodiment, portable electrical measurement also comprises a public connection, and filtering circuit and this public connection will be introducing this public connection because of the electric signal of measured diode open circuit.Further, in one embodiment, filtering circuit comprises first switch, second switch, the 3rd diode and the 4th diode, wherein, be connected along circuit one among first end of first switch and second switch and first contact and second contact near the AC signal generating circuit drive end, second end of first switch is connected with the negative pole of the 3rd diode, second end of second switch is connected with the positive pole of the 4th diode, the positive pole of the 3rd diode is connected with the negative pole of the 4th diode, the negative pole of the positive pole of the 3rd diode and the 4th diode and public connection.Further, in one embodiment, portable electrical measurement, also comprise a display control circuit, with control survey result's demonstration, the output terminal of forward voltage metering circuit all is connected with this display control circuit with the output terminal of tension measuring circuit, current measurement circuit and resistance measuring circuit.
In one embodiment, AC signal generating circuit is connected with a battery web member, and the direct current signal that utilizes the battery be connected in the battery web member to supply with produces AC signal.
The application provides a kind of portable electrical measurement on the other hand, and it comprises that tension measuring circuit, current measurement circuit and resistance measuring circuit are one of at least.Portable electrical measurement also comprises: first AC signal generating circuit, utilize direct current signal to produce first AC signal; First coupling assembling comprises first contact and second contact, be respectively applied for two pins that connect measured diode, the output terminal of first AC signal generating circuit is connected with second contact first AC signal is put on first contact and second contact with first contact; Polarity detection circuit is connected with second contact with first contact, is connected in the polarity of the measured diode of first contact and second contact with detection; Second AC signal generating circuit utilizes direct current signal to produce second AC signal; Second coupling assembling comprises the 3rd contact and the 4th contact, be respectively applied for two pins that connect measured diode, the output terminal of second AC signal generating circuit is connected with the 4th contact second AC signal is put on the 3rd contact and the 4th contact with the 3rd contact; And the forward voltage metering circuit, be connected the pressure drop at its two ends when being connected in the measured diode forward conduction of the 3rd contact and the 4th contact with detection with the 4th contact with the 3rd contact.
In one embodiment, polarity detection circuit and the series connection of first coupling assembling, the forward voltage metering circuit is in parallel with second coupling assembling.
In one embodiment, polarity detection circuit comprises: the first unidirectional turning circuit is connected with first light-emitting component on this first unidirectional turning circuit; And the second unidirectional turning circuit, be connected with second light-emitting component on this second unidirectional turning circuit, wherein, this first unidirectional turning circuit and this second unidirectional turning circuit reverse parallel connection.Further, in one embodiment, first light-emitting component and second light-emitting component are light emitting diode.
In one embodiment, the forward voltage metering circuit also comprises filtering circuit, to eliminate because of the influence to the forward voltage measurement of the electric signal of measured diode open circuit.Further, in one embodiment, portable electrical measurement also comprises a public connection, and filtering circuit and this public connection will be introducing this public connection because of the electric signal of measured diode open circuit.Further, in one embodiment, filtering circuit comprises first switch, second switch, the 3rd diode and the 4th diode, wherein, be connected along circuit one among first end of first switch and second switch and described the 3rd contact and the 4th contact near the described second AC signal generating circuit drive end, second end of first switch is connected with the negative pole of the 3rd diode, second end of second switch is connected with the positive pole of the 4th diode, the positive pole of the 3rd diode is connected with the negative pole of the 4th diode, the negative pole of the positive pole of the 3rd diode and the 4th diode and described public connection.
In one embodiment, portable electrical measurement also comprises the first public connection and second public the connection, the circuit and the first public connection that the circuit and the second public connection of the series connection of the first AC signal generating circuit output terminal and first coupling assembling, the second AC signal generating circuit output terminal and second coupling assembling are connected.
In one embodiment, first AC signal generating circuit comprises an isolating transformer.
In one embodiment, tension measuring circuit is connected with the 4th contact with the 3rd contact, is connected in the pressure drop at the circuit-under-test two ends of the 3rd contact and the 4th contact with measurement.
In one embodiment, first and second AC signal generating circuits are connected with a battery web member, and the direct current signal that utilizes the battery be connected in the battery web member to supply with produces first and second AC signal respectively.
The application adopts the AC signal test diode, can finish the test to diode a step.
Measured diode can be a light emitting diode.
Portable electrical measurement of the present utility model can comprise the combination in any of above-mentioned feature.By hereinafter to detailed description of the present utility model and with reference to corresponding accompanying drawing, to clearly illustrate above-mentioned and other purposes, feature and advantage of the present utility model, wherein, accompanying drawing as the disclosed part of the utility model with the form of the embodiment principle of the present utility model of having explained in detail.
[description of drawings]
Fig. 1 is the functional block diagram that a step of portable electrical measurement is detected the circuit of diode polarity among the application one embodiment.
Fig. 2 is the functional block diagram of the circuit of a pacing amount diode drop of portable electrical measurement among another embodiment of the application.
Fig. 3 is the functional block diagram of portable electrical measurement among another embodiment of the application.
Fig. 4 is the functional block diagram of portable electrical measurement among another embodiment of the application.
Fig. 5 a is the circuit diagram of diode polarity test circuit among the application one embodiment.
Fig. 5 b is the circuit diagram of diode polarity test circuit among another embodiment of the application.
Fig. 6 is the structural representation of portable electrical measurement front panel among the application one embodiment.
Fig. 7 is the circuit diagram of sensor circuit among the application one embodiment.
Fig. 8 is the circuit diagram of the tension measuring circuit in the forward voltage metering circuit among the application one embodiment.
[embodiment]
When accompanying drawings the application's embodiment,, can adopt specific term in the following description for the application's technical scheme fully, clearly is described.But adopt purpose and unrestricted the application's of these particular term spirit and protection domain, and these particular term should comprise the technical characterictic that all are equal to.Not only comprise direct connection such as " connection ", also comprise connection by other circuit components.
Please join Fig. 1, the circuit 10 that a step of the portable electrical measurement among the application one embodiment is detected diode polarity comprises AC signal generating circuit 11, contact 12 and 13, diode polarity detection circuit 14 and battery 15.Wherein, AC signal generating circuit 11 utilizes direct current signal to produce AC signal.Contact 12 and 13 is used to connect two pins of measured diode, and contact 12 and 13 is connected with the output terminal of AC signal generating circuit 11, and the AC signal that AC signal generating circuit 11 is produced puts on contact 12 and 13.Contact in diode polarity detection circuit 14 and contact 12 and 13, be connected in the polarity and the state of the diode of contact 12 and 13 with measurement.In one embodiment, AC signal generating circuit 11 is connected with battery 15, and the direct current signal that utilizes battery 15 to supply with produces AC signal.
AC signal generating circuit 11 can be any circuit that utilizes direct current signal to produce AC signal.
Please join Fig. 2, the circuit 20 of a pacing amount diode drop of the portable electrical measurement among another embodiment of the application comprises AC signal generating circuit 21, contact 22 and 23, diode drop metering circuit 24 and battery 25.Wherein, AC signal generating circuit 21 utilizes direct current signal to produce AC signal.Contact 22 and 23 is used to connect two pins of measured diode, and contact 22 and 23 is connected with the output terminal of AC signal generating circuit 21, and the AC signal that AC signal generating circuit 21 is produced puts on contact 22 and 23.Diode drop metering circuit 24 and contact 22 and 23 parallel connections, the pressure drop when being connected in the diode forward conducting of contact 22 and 23 between the contact 22 and 23 with measurement.In one embodiment, AC signal generating circuit 21 is connected with battery 25, and the direct current signal that utilizes battery 25 to supply with produces AC signal.Known to the industry those skilled in the art, portable electrical measurement generally can not be installed on battery in the battery compartment when selling, the AC signal generating circuit that is to say the application's this moment is not connected with battery, therefore, exactly, AC signal generating circuit 21 is to be connected with battery feed circuit.
Please join Fig. 3, the circuit 30 of the portable electrical measurement one pacing examination diode among another embodiment of the application comprises AC signal generating circuit 31, contact 32 and 33, diode polarity detection circuit 34, battery 35 and diode drop metering circuit 36.Wherein, AC signal generating circuit 31 utilizes direct current signal to produce AC signal.Contact 32 and 33 is used to connect two pins of measured diode, and contact 32 and 33 is connected with the output terminal of AC signal generating circuit 31, and the AC signal that AC signal generating circuit 31 is produced puts on contact 32 and 33.Contact in diode polarity detection circuit 34 and contact 32 and 33, be connected in the polarity and the state of the diode of contact 32 and 33 with measurement.Diode drop metering circuit 36 and contact 32 and 33 parallel connections, the pressure drop when being connected in the diode forward conducting of contact 32 and 33 between the contact 32 and 33 with measurement.In one embodiment, AC signal generating circuit 31 is connected with battery 35, and the direct current signal that utilizes battery 35 to supply with produces AC signal.
Please join Fig. 4, be the functional block diagram of portable electrical measurement 100 among the application one embodiment.Portable electrical measurement 100 comprises battery connecting terminal 101 and 102, microprocessor 103, contact 105-111, the first public connection 113, holding circuit 115, tension measuring circuit 117, current measurement circuit 119, resistance measuring circuit 121, switch 123-127.Portable electrical measurement 100 also comprises 129, the second public connection 131 of first AC signal generating circuit, polarity detection circuit 133, contact 135 and 137.Portable electrical measurement 100 also comprises second AC signal generating circuit 139, switch 141, forward voltage metering circuit 143 and switch 145.In one embodiment, battery connecting terminal 101 and 102 is two contacts of a battery coupling assembling.
Holding circuit 115 protection is by its each circuit that is connected with contact 105-111, makes these circuit avoid destruction by the high-intensity electrical signals of contact 105-111 introducing.In one embodiment, contact 105-111 is the probe pen slot of portable electrical measurement 100, is used to connect probe pen.
In one embodiment, contact 111 publicly is connected 113 and connects with first, and the electric signal that can introduce circuit-under-test by contact 109 and contact 111 is connected in the voltage at the circuit-under-test two ends of contact 109 and 111 to tension measuring circuit 117 with measurement.An electric signal can be put on electric signal that circuit-under-test introduces circuit-under-test simultaneously to resistance measuring circuit 121 by contact 109 and contact 111, be connected in the resistance of the circuit-under-test of contact 109 and 111 with measurement.The electric signal that can introduce circuit-under-test by contact 105/107 and contact 111 is to current measurement circuit 119, to measure the electric current of circuit-under-test.In one embodiment, contact 105 is used to measure big electric current with contact 111, and such as greater than 400mA, contact 107 is used to measure little electric current with contact 111, such as less than 400mA.Known to the industry those skilled in the art, the quantity of contact with and and each circuit between annexation can be provided with according to demand, more than being provided with only is for embodiment of the application is described fully.
Can select measurement function by the switch (as switch 123-127,128,141 and 145) that links to each other with each measurement function.Wherein, these switches can be mechanical switch, as knob switch, also can be digital switchs, as diaphragm type switch etc.
Existing multiple voltage metering circuit, resistance measuring circuit and current measurement circuit before the application, therefore, the application no longer gives unnecessary details these circuit.
In one embodiment, battery connecting terminal 102 and V
SsConnect, wherein V
SsBe power ground.Battery connecting terminal 101 can be connected with the both positive and negative polarity of a battery respectively with 102, but perhaps a plurality of batteries of serial or parallel connection between the battery connecting terminal 101 and 102, with to each circuit supply.In one embodiment, battery connecting terminal 101 is connected with the positive pole of battery, and battery connecting terminal 102 is connected with the negative pole of battery.
Microprocessor 103 is connected with battery connecting terminal 101, by the powered battery that is connected in battery connecting terminal 101 and 102.Microprocessor 103 receives the output signal of each metering circuit, and according to the duty gating of portable electrical measurement 100 one road signal wherein, and control display device (such as LCDs) (not shown) shows measured value.Microprocessor 103 also can show the type of measured value according to the duty control display device of portable electrical measurement 100, such as showing " V ", show the forward voltage that the current demonstration measured value of " LED TEST " expression is LED to represent that current demonstration measured value is a magnitude of voltage.
First AC signal generating circuit 129 produces the required AC signal of test by the powered battery that is connected in battery connecting terminal 101 and 102.First AC signal generating circuit 129 comprises inverter circuit 1291, isolating transformer 1293, rectification circuit 1295 and AC driving circuit 1297.Inverter circuit 1291 will be converted into alternating current by the direct current that battery is supplied with, and supply alternating currents by isolating transformer 1293 to rectification circuit 1295.Rectification circuit 1295 will be converted into two opposite polarity direct currents by the alternating current that isolating transformer 1293 is supplied with, and export it to AC driving circuit 1297.AC driving circuit 1297 utilizes two opposite polarity direct currents of input to produce ac square wave and export it to polarity detection circuit 133.Wherein, the reference edge of rectification circuit 1295 publicly is connected 131 and connects with second.AC signal by 129 outputs of first AC signal generating circuit can form the loop via polarity detection circuit 133, contact 135, contact 137 and the second public connection 131.
Second AC signal generating circuit 139 comprises AC signal generating circuit 1391 and resistance 1393.AC signal generating circuit 1391 is converted to alternating current by the powered battery that is connected in battery connecting terminal 101 and 102 with direct current, measures power supply by resistance 1393 for forward voltage, and resistance 1393 is used for the dividing potential drop current limliting.The reference edge of AC signal generating circuit 1391 publicly is connected 113 and connects with first.When switch 141 closures, and contact 109 is connected with the two pins of a measured diode respectively with 111, the AC signal that AC signal generating circuit 1391 produces can be passed through resistance 1393, contact 109, measured diode, contact 111 and the first public connection 113 successively and be formed the loop, if measured diode is a light emitting diode, this circuit can drive tested lumination of light emitting diode.Because the avalanche effect of light emitting diode, under the prerequisite that keeps lumination of light emitting diode, raising or reduction power source voltage are little for the pressure drop affects at light emitting diode two ends.That is to say,,, can probably determine its forward voltage V by the pressure drop of measuring tested light emitting diode two ends to drive tested lumination of light emitting diode as long as voltage is adjusted in the certain limit
FBecause contact 111 publicly is connected 113 and connects with first, during the measured diode forward conduction, the pressure drop that contact 109 and the first public electric potential difference that is connected between 113 are measured diode.Therefore, as long as the electromotive force at 109 places, contact is drawn, contact 109 and the first public electric potential difference that is connected between 113 can obtain the pressure drop of measured diode when measuring the measured diode forward conduction.
In one embodiment, be connected with contact 109 when measured diode is anodal, its negative pole is connected with contact 111, the forward voltage that records be on the occasion of; When measured diode oppositely connected, the forward voltage that records was a negative value.In a word, no matter be that forward connects or the reverse measured diode that connects, can both a pacing get its forward voltage.
Forward voltage metering circuit 143 comprises sensor circuit 161 and tension measuring circuit 163.Sensor circuit 161 is according to the direction control tension measuring circuit 163 of the pressure drop at measured diode two ends.
In another embodiment, can replace resistance 1393 by variable resistor, so, can be by regulating the drive current that variable-resistance resistance is regulated tested light emitting diode, to measure all size positive voltage of light emitting diode more accurately.
Please join Fig. 5 a, be the circuit diagram of the application's one embodiment Semi-polarity testing circuit 133.Polarity detection circuit 133 comprises the light emitting diode 1331 and 1333 of two reverse parallel connections, and the resistance 1335 of connecting with the light emitting diode 1331 and 1333 of these two parallel connections is used for the dividing potential drop current limliting.The reference edge of AC driving circuit 1297 publicly is connected 131 and connects with second, and its drive end is connected with light emitting diode 1331 and 1333.The light emitting diode 1331 and 1333 of AC driving circuit 1297, reverse parallel connection, resistance 1335, contact 135 publicly are connected 131 on same loop with 137 and second.Two pins of measured diode are connected with contact 135 and 137 respectively, just can judge the polarity and the quality of measured diode according to the state of light emitting diode 1331 and 1333.Known to the industry those skilled in the art, polarity detection circuit 133 can be located at any one position in the loop.Please join Fig. 5 b, polarity detection circuit 133 two ends publicly are connected 131 and connect with second with contact 137 respectively.
The resistance of resistance 1335 is fixed, and the alternating voltage kept stable of first AC signal generating circuit, 129 outputs may can only be suitable for the test of the polarity of forward operating voltage light emitting diode within the specific limits so.If the forward operating voltage of tested light emitting diode is bigger, and working properly, but light emitting diode 1331 and 1333 may be all not luminous when tested, thereby cause flase drop to survey.In another embodiment, available variable resistor replaces resistance 1335, regulates drive current by regulating this variable-resistance resistance, thereby is suitable for the test of different size light emitting diode.
Please join following table 1, if light emitting diode 1331 is luminous, light emitting diode 1333 is not luminous, and then the pin that is connected with contact 135 of measured diode is a positive pole.If light emitting diode 1331 is not luminous, light emitting diode 1333 is luminous, and then the pin that is connected with contact 135 of measured diode is a negative pole.If light emitting diode 1331 and 1333 is all luminous, measured diode punch through damage is described then.If light emitting diode 1331 and 1333 is not luminous, the measured diode damage of having opened circuit is described then.
| 1331 | 1333 | Polarity/quality |
| Luminous | Not luminous | The pin that is connected with |
| Not luminous | Luminous | The pin that is connected with |
| Luminous | Luminous | Punch through damage |
| Not luminous | Not luminous | The damage of opening circuit |
Table 1
In another embodiment, light emitting diode 1331 and 1333 also can replace with the light-emitting component and the diode of series connection.
Please join Fig. 6, be the panel synoptic diagram of portable electrical measurement 100.The panel of portable electrical measurement 100 is provided with diode pin slot 135a and 137a, respectively the contact 135 and 137 in the corresponding diagram 4.Also be provided with the light emitting diode 1331 and 1333 among pilot lamp 1331a and 1333a difference corresponding diagram 5a and the 5b on the panel of portable electrical measurement 100.In one embodiment, pilot lamp 1331a is located at diode pin slot 135a below, and pilot lamp 1333a is located at diode pin slot 137a below.So, detecting the diode polarity chron, be inserted in the corresponding diode pin of luminous pilot lamp slot in the pin of measured diode for anodal, the user judges that polarity is very easy to.
The application's polarity detection circuit and forward voltage metering circuit are particularly useful for testing light emitting diode.
Please join Fig. 7, sensor circuit 161 comprises resistance 1611, electric capacity 1613, first comparer 1615 and second comparer 1617.The electromotive force at 109 places, contact is directed to first end of resistance 1611, and second end of resistance 1611 is connected with the inverting input of the in-phase input end of first comparer 1615 and second comparer 1617.One end of electric capacity 1613 is connected with second end of resistance 1611, and its other end publicly is connected 113 and connects with first.Resistance 1611 and electric capacity 1613 constitute low-pass filter circuit, will be converted to comparatively stable direct current signal from the AC signal at 109 places, contact and import first comparer 1615 and second comparer 1617 again.The inverting input of first comparer 1615 is imported first datum, and the normal phase input end of second comparer 1617 is imported second datum.
In one embodiment, if the signal of the normal phase input end of first comparer 1615 and second comparer 1617 is less than the signal of inverting input, first comparer 1615 and second comparer 1617 send first signal.If the signal of the normal phase input end of first comparer 1615 and second comparer 1617 is greater than the signal of inverting input, first comparer 1615 and second comparer 1617 send secondary signal.If the signal of the normal phase input end of first comparer 1615 and second comparer 1617 equals the signal of inverting input, then first comparer 1615 and second comparer 1617 send the 3rd signal.The signal that first comparer 1615 and second comparer 1617 send is used to control tension measuring circuit 163.
In one embodiment, the square wave of AC signal generating circuit 1391 output ± 15V.If the positive pole of measured diode is connected with contact 109, the signal of importing first comparer, 1615 in-phase input ends and second comparer, 1617 inverting inputs so is measured diode two ends pressure drop (on the occasion of) and the mean value of-15V, the absolute value of forward voltage of supposing measured diode is less than 15V, and then this mean value is less than 0.Opposite, if the negative pole of measured diode is connected with contact 109, this mean value is greater than 0 so.If inner open circuit of measured diode or reverse breakdown, then this mean value is 0 (in one embodiment, in fact this mean value equals the electromotive force of the first public connection, and has a slight deviation between this electromotive force and 0).In one embodiment, wish to prevent that the signal of first comparer, 1615 in-phase input ends equates with first datum, the signal of second comparer, 1617 inverting inputs equates with second datum, prevents that promptly first comparer 1615 and second comparer 1617 from sending the 3rd signal.Thereby first datum is set to the level of one a little higher than first public connection 113 electromotive forces, such as a level that is higher than the first public connection 113 electromotive force 0.5V.And second datum is set to a level that is lower than first public connection 113 electromotive forces slightly, such as a level that is lower than the first public connection 113 electromotive force 0.5V.So, under measured diode prerequisite working properly, if the positive pole of measured diode is connected with contact 109, first comparer 1615 sends first signal, and second comparer 1617 sends secondary signal; If the negative pole of measured diode is connected with contact 109, then first comparer 1615 sends secondary signal, and second comparer 1617 sends first signal.If measured diode is damaged, then first comparer 1615 and second comparer 1617 all send first signal.
Being provided with of first datum and second datum can be adjusted according to the scope of the positive voltage of light emitting diode that is suitable for.
In another embodiment, also the function that a comparer is realized sensor circuit 161 can only be set.Such as the reference signal that equals first public connection 113 place's level at one of this comparer in-phase input end and reverse input end input one level, another input end is then imported the electric signal of being introduced by 109 places, contact.First signal and the secondary signal of utilizing this comparer to send are controlled tension measuring circuit 163.Known to the industry those skilled in the art, also have various directions to send the circuit of control signal with control tension measuring circuit 163 by judgement contact 109 and 111 two ends pressure drops, give unnecessary details no longer one by one at this.
Please join Fig. 8, tension measuring circuit 163 comprises the switch 201 and resistance 203,205 of series connection successively, the switch 207 and the resistance 209,211 of series connection successively, and wherein, the output terminal of sensor circuit 161 is connected with switch 201 and 207, with gauge tap 201 and 207.Tension measuring circuit 163 also comprises two diode in series 213 and 215, and wherein, the negative pole of diode 213 is connected with resistance 203 and 205, and the positive pole of diode 213 is connected with the negative pole of diode 215, and the positive pole of diode 215 is connected with resistance 209 and 211.The positive pole of diode 213 is connected 113 jointly with the negative pole and first of diode 215 and connects.Tension measuring circuit 163 also comprises the divider resistance 217 and 219 of series connection, and wherein, divider resistance 219 is a variable resistor.Resistance 205 and 211 is connected with divider resistance 217, and resistance 219 and first is connected 113 jointly and connects.
In one embodiment, the signal controlling that switch 201 is sent by second comparer 1617, the signal controlling that switch 207 is sent by first comparer 1615.Closure when switch 201 and 207 receives respectively secondary signal (being that the in-phase input end signal is greater than the inverting input signal) from second comparer 1617 and first comparer 1615 disconnects when switch 201 and 207 receives respectively first signal (being that the in-phase input end signal is less than the inverting input signal) from second comparer 1617 and first comparer 1615.Be connected with contact 109 when measured diode is anodal, first comparer 1615 sends first signal, and second comparer 1617 sends secondary signal, switch 201 closures, and switch 207 disconnects.When the negative pole of measured diode is connected with contact 109, first comparer 1615 sends secondary signal, and second comparer 1617 sends first signal, and switch 201 disconnects switch 207 closures.Damage when measured diode, first comparer 1615 and second comparer 1617 all send first signal, and switch 201 and switch 207 all disconnect, and measured value is shown as 0.
Tension measuring circuit 163 also comprises operational amplifier 221, resistance 223, potentiometer 225 and resistance 227-231.Resistance 205 is connected with the positive input terminal of operational amplifier 221 with 211, will introduce operational amplifier 221 by the electric signal that 109 places, contact introduce.Can regulate the voltage of input operational amplifier 221 by the resistance of regulating divider resistance 219.Resistance 223, potentiometer 225 and resistance 227 are connected successively, and its two ends add the operating voltage of operational amplifier 221, and in one embodiment, its two ends are connected with battery connecting terminal 101,102 respectively.Wherein, first pin of potentiometer 225 is connected with resistance 223, and second pin of potentiometer 225 is connected with resistance 227.The 3rd pin of potentiometer 225 is connected with the negative input end of operational amplifier 221 by resistance 229, to regulate the electromotive force of operational amplifier 221 negative input ends.The 3rd pin of potentiometer 225 is connected with the output terminal of operational amplifier 221 by resistance 229 and resistance 231 successively, and resistance 231 is used to adjust the enlargement factor of operational amplifier.
Suppose that measured diode is working properly, when the positive pole of measured diode is connected with contact 109, switch 201 closures, switch 207 disconnects, and the AC signal of second AC signal generating circuit, 139 outputs has only positive half cycle can pass through measured diode.When the AC signal of second AC signal generating circuit 139 output during at positive half cycle, 109 electric signal of introducing pass through the positive input terminal of switch 201 and resistance 203 and 205 input operational amplifiers 221 successively from the contact.When the AC signal of second AC signal generating circuit 139 output during at negative half period, because the unilateal conduction characteristic of diode, can't form the loop, the electromotive force at 109 places, contact equals the value of AC signal negative half period, this signal also can be introduced into tension measuring circuit 163, but finally this signal is introduced into the first public connection 113 through switch 201, resistance 203 and diode 213 successively and eliminates.
When the negative pole of measured diode is connected with contact 109, switch 201 disconnects, switch 207 closures, and the AC signal of second AC signal generating circuit, 139 outputs has only negative half period can pass through measured diode.When the AC signal of second AC signal generating circuit 139 output during at negative half period, 109 electric signal of introducing pass through the positive input terminal of switch 207 and resistance 209 and 211 input operational amplifiers 221 successively from the contact.When the AC signal of second AC signal generating circuit 139 output during at positive half cycle, the electromotive force at 109 places, contact equals the value of the positive half cycle of AC signal, this signal also can be introduced into tension measuring circuit 163, but finally this signal is introduced into the first public connection 113 through switch 207, resistance 209 and diode 215 successively and eliminates.
The effect of switch 201, switch 207, diode 213 and diode 215 is to remove in the AC signal that second AC signal generating circuit 139 exported because of the influence to the forward voltage measurement of the half cycle signal of measured diode open circuit.Therefore, this partial circuit can be described as filtering circuit.Except that embodiment shown in Figure 8, any other circuit with this function all can be applicable to this.
In addition, as long as the waveform of the half cycle AC signal of being opened a way is certain, also can go out the actual pressure drop at measured diode two ends by specific algorithm computation.
Operational amplifier 221 exports it to microprocessor 103 after the signal that receives is amplified, and microprocessor 103 control display device show measured value that should signal.Herein, this measured value is the forward voltage drop of measured diode, approaches its forward operating voltage V
FIf the positive pole of measured diode is connected with contact 109, then the display device demonstration on the occasion of, otherwise the demonstration negative value.Therefore, utilize the application's portable electrical measurement, can obtain the forward operating voltage of measured diode by single measurement, very easy to use.From the above, also can utilize the forward voltage measurement function of the portable electrical measurement of the application to judge the polarity of measured diode: display device show on the occasion of, show that then the pin that is connected with contact 109 is the positive pole of measured diode; Display device shows negative value, shows that then the pin that is connected with contact 109 is the negative pole of measured diode.
Owing to adopt the forward voltage of ac signal measurement diode, the signal of finally delivering to microprocessor 103 is a undulating quantity, can in microprocessor 103, perhaps between microprocessor 103 and tension measuring circuit 163, low-pass filter circuit be set, steady with what keep measured value to show.
The amplification of 221 pairs of input signals of above operational amplifier comprises dwindling or amplify input signal.
In one embodiment, the first public connection 113 with second public be connected 131 separate.Detect the diode polarity chron the user, hand is easy to touch the pin of measured diode.If have high-intensity electrical signals to introduce portable electrical measurement 100 from contact 105-111 this moment, because the first separate public connection 113 publicly is connected 131 with second, and the isolation of isolating transformer 1293, this high-intensity electrical signals can not be directed to the user and cause danger, thus the security that has improved portable electrical measurement 100 greatly.
In another embodiment, the first public connection 113 publicly is connected 131 and connects with second.Wherein, the first public connection 113 publicly is connected 131 for signal ground with second.
In one embodiment, the test of the polarity test of diode and forward voltage is by same AC signal generating circuit power supply.
In another embodiment, polarity test circuit and an AC signal generating circuit and two are used to be connected the contact series connection of the pin of measured diode, and the forward voltage metering circuit is then in parallel with this two contact, thereby realizes one-shot measurement polarity and forward voltage.
In one embodiment, the dry cell of polyphone two joint 1.5V between the battery connecting terminal 101 and 102.First AC signal generating circuit 129 is exported the ac square wave of 15V, is used to detect the polarity of tested light emitting diode.The alternating current of second AC signal generating circuit, 139 output 15V is used to detect tested positive voltage of light emitting diode.Please join following table 2, be the portable electrical measurement of the utilizing the application measured value to the positive voltage of light emitting diode of three different sizes, its error is no more than 10%.
| Specification | The forward measured value | Error | Reverse measured value | Error |
| 1.7V | 1.64V | 3.5％ | -1.58V | 7.1％ |
| 3V | 2.98V | 0.7％ | -2.94V | 2％ |
| 5.8V | 6.01V | 3.6％ | -5.99V | 3.3％ |
Table 2
As long as driving voltage is adjusted to the tested lumination of light emitting diode of enough drivings, the forward voltage metering circuit just can be used for measuring positive voltage of light emitting diode.
Also can be applicable to the test of triode behind the portable electrical measurement Change In Design with the application.
As from the foregoing, target of the present utility model realizes completely effectively.Above-mentioned each embodiment only is for 26S Proteasome Structure and Function principle of the present utility model is described, its purpose be not be used to disclose all in the spirit and scope of claim to modification, transformation that the application made and substitute.Known to the industry those skilled in the art, under the guidance of the application's spirit, can make various changes and adjustment, but these change and adjust still within the application's the scope that spirit contained at the circuit of the embodiment of the present application.
Claims (23)
1. portable electrical measurement comprises that tension measuring circuit, current measurement circuit and resistance measuring circuit one of at least, is characterized in that, it comprises that also a step detects the circuit of diode, and this circuit comprises:
AC signal generating circuit utilizes direct current signal to produce AC signal,
Coupling assembling, comprise first contact and second contact, be respectively applied for two pins that connect measured diode, wherein, the output terminal of described AC signal generating circuit is connected with this first contact and second contact described AC signal being put on this first contact and second contact, and
The diode test circuit is connected with described first contact and second contact, is connected in the measured diode of first contact and second contact with detection.
2. portable electrical measurement as claimed in claim 1 is characterized in that, described diode test circuit is a polarity detection circuit.
3. portable electrical measurement as claimed in claim 2 is characterized in that, described polarity detection circuit and described coupling assembling and AC signal generating circuit output terminal polyphone.
4. portable electrical measurement as claimed in claim 3 is characterized in that, described polarity detection circuit comprises:
The first unidirectional turning circuit is connected with first light-emitting component on this first unidirectional turning circuit, and
The second unidirectional turning circuit is connected with second light-emitting component on this second unidirectional turning circuit, wherein, and this first unidirectional turning circuit and this second unidirectional turning circuit reverse parallel connection.
5. portable electrical measurement as claimed in claim 4 is characterized in that, described first light-emitting component and second light-emitting component are light emitting diode.
6. portable electrical measurement as claimed in claim 1 is characterized in that, described diode test circuit is the forward voltage metering circuit.
7. portable electrical measurement as claimed in claim 6, it is characterized in that, described forward voltage metering circuit is in parallel with described coupling assembling, the pressure drop when being connected in the measured diode forward conduction of first contact and second contact with measurement between first contact and second contact.
8. portable electrical measurement as claimed in claim 7 is characterized in that, described forward voltage metering circuit also comprises filtering circuit, to eliminate because of the influence to the forward voltage measurement of the electric signal of measured diode open circuit.
9. portable electrical measurement as claimed in claim 8 is characterized in that, it also comprises a public connection, and described filtering circuit and this public connection will be introducing this public connection because of the electric signal of tested light-emitting diode open-circuit.
10. portable electrical measurement as claimed in claim 9, it is characterized in that, described filtering circuit comprises first switch, second switch, the 3rd diode and the 4th diode, wherein, be connected along circuit one among first end of first switch and second switch and described first contact and second contact near described AC signal generating circuit drive end, second end of first switch is connected with the negative pole of the 3rd diode, second end of second switch is connected with the positive pole of the 4th diode, the positive pole of the 3rd diode is connected with the negative pole of the 4th diode, the negative pole of the positive pole of the 3rd diode and the 4th diode and described public connection.
11. portable electrical measurement as claimed in claim 6, it is characterized in that, it also comprises a display control circuit, with control survey result's demonstration, the output terminal of described forward voltage metering circuit all is connected with this display control circuit with the output terminal of described tension measuring circuit, current measurement circuit and resistance measuring circuit.
12. portable electrical measurement as claimed in claim 1 is characterized in that, it also comprises a battery coupling assembling, and described AC signal generating circuit is connected with this battery coupling assembling.
13. a portable electrical measurement, it comprises that tension measuring circuit, current measurement circuit and resistance measuring circuit one of at least, is characterized in that, it also comprises the circuit of pacing examination diode, and this circuit comprises:
First AC signal generating circuit utilizes direct current signal to produce first AC signal,
First coupling assembling comprises first contact and second contact, be respectively applied for two pins that connect measured diode, the output terminal of first AC signal generating circuit is connected with second contact so that described first AC signal is put on first contact and second contact with first contact
Polarity detection circuit is connected with second contact with first contact, is connected in the polarity of the measured diode of first contact and second contact with detection,
Second AC signal generating circuit utilizes direct current signal to produce second AC signal,
Second coupling assembling comprises the 3rd contact and the 4th contact, be respectively applied for two pins that connect measured diode, the output terminal of second AC signal generating circuit is connected with the 4th contact so that described second AC signal is put on the 3rd contact and the 4th contact with the 3rd contact
And the forward voltage metering circuit, be connected the pressure drop at its two ends when being connected in the measured diode forward conduction of the 3rd contact and the 4th contact with detection with the 4th contact with the 3rd contact.
14. portable electrical measurement as claimed in claim 13 is characterized in that, described polarity detection circuit and the series connection of first coupling assembling, and described forward voltage metering circuit is in parallel with second coupling assembling.
15. portable electrical measurement as claimed in claim 14 is characterized in that, described polarity detection circuit comprises:
The first unidirectional turning circuit is connected with first light-emitting component on this first unidirectional turning circuit, and
The second unidirectional turning circuit is connected with second light-emitting component on this second unidirectional turning circuit, wherein, and this first unidirectional turning circuit and this second unidirectional turning circuit reverse parallel connection.
16. portable electrical measurement as claimed in claim 15 is characterized in that, described first light-emitting component and second light-emitting component are light emitting diode.
17. portable electrical measurement as claimed in claim 13 is characterized in that, described forward voltage metering circuit also comprises filtering circuit, to eliminate because of the influence to the forward voltage measurement of the electric signal of measured diode open circuit.
18. portable electrical measurement as claimed in claim 17 is characterized in that, it also comprises a public connection, and described filtering circuit and this public connection will be introducing this public connection because of the electric signal of measured diode open circuit.
19. portable electrical measurement as claimed in claim 18, it is characterized in that, described filtering circuit comprises first switch, second switch, the 3rd diode and the 4th diode, wherein, be connected along circuit one among first end of first switch and second switch and described the 3rd contact and the 4th contact near the described second AC signal generating circuit drive end, second end of first switch is connected with the negative pole of the 3rd diode, second end of second switch is connected with the positive pole of the 4th diode, the positive pole of the 3rd diode is connected with the negative pole of the 4th diode, the negative pole of the positive pole of the 3rd diode and the 4th diode and the described first public connection.
20. portable electrical measurement as claimed in claim 14, it is characterized in that, it also comprises the first public connection and second public the connection, the circuit and the first public connection that the circuit and the second public connection of the series connection of the first AC signal generating circuit output terminal and first coupling assembling, the second AC signal generating circuit output terminal and second coupling assembling are connected.
21. portable electrical measurement as claimed in claim 13 is characterized in that, described first AC signal generating circuit comprises an isolating transformer.
22. portable electrical measurement as claimed in claim 13 is characterized in that, described tension measuring circuit is connected with the 4th contact with the 3rd contact, is connected in the pressure drop at the circuit-under-test two ends of the 3rd contact and the 4th contact with measurement.
23. portable electrical measurement as claimed in claim 13 is characterized in that, it also comprises a battery coupling assembling, and described first AC signal generating circuit is connected with this battery coupling assembling with second AC signal generating circuit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200920157851 CN201583604U (en) | 2009-06-03 | 2009-06-03 | Portable electrical measurement device with diode testing functions |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200920157851 CN201583604U (en) | 2009-06-03 | 2009-06-03 | Portable electrical measurement device with diode testing functions |
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| CN201583604U true CN201583604U (en) | 2010-09-15 |
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| CN 200920157851 Expired - Lifetime CN201583604U (en) | 2009-06-03 | 2009-06-03 | Portable electrical measurement device with diode testing functions |
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| CN102680845A (en) * | 2012-05-04 | 2012-09-19 | 深圳市连硕设备技术有限公司 | Polarity determining device of direct plug-in type two-pin semiconductor |
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| CN102680845B (en) * | 2012-05-04 | 2014-11-26 | 深圳连硕自动化科技有限公司 | Polarity determining device of direct plug-in type two-pin semiconductor |
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| CN105067946B (en) * | 2015-07-16 | 2019-09-10 | 上海博泽电机有限公司 | Device and motor positive and negative anodes recognition methods for the identification of motor positive and negative anodes |
| CN105067946A (en) * | 2015-07-16 | 2015-11-18 | 上海博泽电机有限公司 | Apparatus and method for recognizing positive and negative electrodes of motor |
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| CN109068254A (en) * | 2018-07-06 | 2018-12-21 | 郑州大学 | A kind of voice coil polarity test device based on ergonomics in safety |
| CN109856524A (en) * | 2019-02-19 | 2019-06-07 | 无锡英迪芯微电子科技股份有限公司 | Voltage measurement method and tension measuring circuit |
| CN109856524B (en) * | 2019-02-19 | 2021-04-13 | 无锡英迪芯微电子科技股份有限公司 | Voltage measurement method and voltage measurement circuit |
| US20220116103A1 (en) * | 2020-10-09 | 2022-04-14 | Schweitzer Engineering Laboratories, Inc. | Wireless radio repeater for electric power distribution system |
| US11973566B2 (en) * | 2020-10-09 | 2024-04-30 | Schweitzer Engineering Laboratories, Inc. | Wireless radio repeater for electric power distribution system |
| CN114113705A (en) * | 2021-11-23 | 2022-03-01 | 中车大连机车车辆有限公司 | Diode terminal strip with self-detection fault state and detection circuit thereof |
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Effective date of registration: 20160512 Address after: Washington State Patentee after: Fluke Corp. Address before: 200335, building 6, building 4, 280 Lane Road, Changning District, Shanghai Patentee before: Danaher (Shanghai) Industrial Instruments Technology Research and Development Co., Ltd. |
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Granted publication date: 20100915 |