CN105700611A - Adjustable constant current electronic load - Google Patents
Adjustable constant current electronic load Download PDFInfo
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- CN105700611A CN105700611A CN201610157178.6A CN201610157178A CN105700611A CN 105700611 A CN105700611 A CN 105700611A CN 201610157178 A CN201610157178 A CN 201610157178A CN 105700611 A CN105700611 A CN 105700611A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
- G05F1/565—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor
- G05F1/569—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor for protection
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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
- G01R31/282—Testing of electronic circuits specially adapted for particular applications not provided for elsewhere
- G01R31/2829—Testing of circuits in sensor or actuator systems
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Abstract
The invention discloses an adjustable constant current electronic load which comprises M adjustable constant current branches. Each adjustable constant current branch comprises a liner voltage stabilizer and N shunt branches formed by series connection of power resistors and switches, the input end of the liner voltage stabilizer is connected with the output end of a to-be-measured driving circuit, and the output voltage end of the liner voltage stabilizer is connected with the ground connection end through each shunt branch. When the number of the power resistors connected to the output voltage end of the liner voltage stabilizer is unchanged, according to the characteristics of constant output voltage of the liner voltage stabilizer, an output current of the liner voltage stabilizer is also constant, and an input current of the liner voltage stabilizer is also constant according to the characteristics that the output current of the liner voltage stabilizer is equal to the input current of the liner voltage stabilizer. Therefore, no matter what changes occur to the input voltage of the liner voltage stabilizer, the input current of the liner voltage stabilizer is kept constant, and thus a constant current function is achieved. Through regulation of the switches, the number of the power resistors connected to the output voltage end of the liner voltage stabilizer is controlled, and the constant current value is adjusted.
Description
Technical field
The present invention relates to electronic load technical field, in particular, relate to a kind of adjustable constant-flow electronic load。
Background technology
Along with vehicle intellectualized development, Vehicle Electronic Control module gets more and more, and for ensureing the reliability of car load, first needs to ensure the reliability of Vehicle Electronic Control module。It is known that there is multiple drive circuit in Vehicle Electronic Control module, this drive circuit is also part most important, the most flimsy, when Vehicle Electronic Control module is carried out reliability demonstration, the checking of its drive circuit is particularly important。
Traditional verification method is directly to be connected in series in drive circuit to be measured using the power resistor as electronic load, when arranging the change of the input voltage of Vehicle Electronic Control module of this drive circuit to be measured, the output voltage of drive circuit to be measured also changes therewith, according to U=IR (R is definite value) it can be seen that the driving electric current in drive circuit to be measured also changes therewith。Therefore, traditional verification method can not realize the checking of the constant drive current to drive circuit to be measured, also cannot realize under different voltage conditions the checking of same driving electric current to drive circuit to be measured, therefore cannot meet the designing requirement to product。
To sum up, how to design a kind of when input voltage changes, the electronic load of output constant current hold, it is achieved the checking to the constant drive current of drive circuit to be measured, for the reliability testing of Vehicle Electronic Control module, have very important significance。
Summary of the invention
In view of this, the present invention provides a kind of adjustable constant-flow electronic load, to realize the checking of the constant drive current to drive circuit。
A kind of adjustable constant-flow electronic load, including: M adjustable constant-flow branch road, each input of described adjustable constant-flow branch road is connected with the outfan of drive circuit to be measured, and M is positive integer, and described adjustable constant-flow branch road includes:
Linear voltage regulator and N number of diverter branch, described diverter branch includes the power resistor and the switch that are connected in series, and N is positive integer；
The input of described linear voltage regulator is connected with the outfan of described drive circuit to be measured as the input of described adjustable constant-flow branch road, the output voltage terminal of described linear voltage regulator connects earth terminal by each described diverter branch, and the grounding ports of described linear voltage regulator connects earth terminal。
Preferably, also include: overvoltage crowbar；
The input of described overvoltage crowbar is connected with the outfan of described drive circuit to be measured; the outfan of described overvoltage crowbar is connected with the input of described linear voltage regulator, and described overvoltage crowbar is for limiting the input voltage maximum operating voltage less than described linear voltage regulator of described linear voltage regulator。
Preferably, described excess voltage protection includes:
First reference voltage circuit, bleeder circuit, the first comparator circuit and first control circuit；
The input of described first reference voltage circuit is connected with the outfan of described drive circuit to be measured, the outfan of described first reference voltage circuit is connected with the positive input terminal of described first comparator circuit, and described first reference voltage circuit is for exporting the first reference voltage to described first comparator circuit；
The input of described bleeder circuit is connected with the outfan of described drive circuit to be measured, the outfan of described bleeder circuit is connected with the negative input end of described first comparator circuit, described bleeder circuit for carrying out dividing potential drop to the voltage of the output of described drive circuit to be measured, and exports the voltage after dividing potential drop to described first comparator circuit；
Described first comparator circuit is for comparing the voltage after described dividing potential drop and described first reference voltage, when the voltage after described dividing potential drop is lower than described first reference voltage, and described first comparator circuit output high level；When the voltage after described dividing potential drop is higher than described first reference voltage, described first comparator circuit output low level；
The input of described first control circuit is connected with the outfan of described drive circuit to be measured, the end that controls of described first control circuit is connected with the outfan of described first comparator circuit, the outfan of described first control circuit is connected with the input of described linear voltage regulator, when described first comparator circuit output high level, described first control circuit normal operation；When described first comparator circuit output low level, described first control circuit disconnects the connection between the outfan of described drive circuit to be measured, it is achieved the overvoltage protection to described linear voltage regulator。
Preferably, also include: circuit overcurrent protection；
The input of described circuit overcurrent protection is connected with the outfan of described drive circuit to be measured; the outfan of described circuit overcurrent protection is connected with the input of described linear voltage regulator, and described circuit overcurrent protection is for limiting the input current the highest input current less than described linear voltage regulator of described linear voltage regulator。
Preferably, described circuit overcurrent protection includes:
Second reference voltage circuit, sensor circuit, the second comparator circuit and second control circuit；
The input of described second reference voltage circuit is connected with the outfan of described drive circuit to be measured, the outfan of described second reference voltage circuit is connected with the positive input terminal of described second comparator circuit, and described second reference voltage circuit is for exporting the second reference voltage to described second comparator circuit；
The input of described sensor circuit is connected with the outfan of described drive circuit to be measured, the outfan of described sensor circuit is connected with the negative input end of described second comparator circuit, described sensor circuit for converting voltage signal to by the current signal that described drive circuit to be measured exports, and voltage output extremely described second comparator that will be converted to；
Described second comparator circuit is for comparing described voltage and described second reference voltage, when described voltage is lower than described second reference voltage, and described second comparator circuit output high level；When described voltage is higher than described second reference voltage, described second comparator circuit output low level；
The input of described second control circuit is connected with the outfan of described drive circuit to be measured, the end that controls of described second control circuit is connected with the outfan of described second comparator circuit, the outfan of described second control circuit is connected with the input of described linear voltage regulator, when described second comparator circuit output high level, described second control circuit normal operation；When described second comparator circuit output low level, described second control circuit disconnects the connection between the outfan of described drive circuit to be measured, it is achieved the overcurrent protection to described linear voltage regulator。
Preferably, also include: radiating module；
Described radiating module is as the fixing parts of described linear voltage regulator and described power resistor, for described linear voltage regulator and described power resistor are dispelled the heat。
Preferably, described linear voltage regulator is low pressure difference linear voltage regulator。
Can be seen that from above-mentioned technical scheme, the invention provides a kind of adjustable constant-flow electronic load, including M adjustable constant-flow branch road, each adjustable constant-flow branch road include linear voltage regulator and N number of by power resistor and switch be connected in series the diverter branch formed, the input of linear voltage regulator is connected with the outfan of drive circuit to be measured, and the output voltage terminal of linear voltage regulator connects earth terminal by each diverter branch。When accessing the quantity of power resistor of linear stabilizer output voltage end and being constant, according to the characteristic that linear stabilizer output voltage is constant, the output electric current of linear voltage regulator is also constant, exports, according to linear voltage regulator, the characteristic that electric current is equal with input current, and the input current of linear voltage regulator is also constant。Therefore, no matter whether the input voltage of linear voltage regulator changes, and the input current of linear voltage regulator all keeps constant, thus realizing constant current function；By regulating switch, control to access the power resistor quantity of linear stabilizer output voltage end, it is achieved the adjustment to constant current numerical value。Therefore, adjustable constant-flow electronic load provided by the invention can realize the checking of the constant drive current to drive circuit, thus solving the problems of the prior art。
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, the accompanying drawing used required in embodiment or description of the prior art will be briefly described below, apparently, accompanying drawing in the following describes is only embodiments of the invention, for those of ordinary skill in the art, under the premise not paying creative work, it is also possible to obtain other accompanying drawing according to the accompanying drawing provided。
Fig. 1 is the circuit diagram of a kind of adjustable constant-flow electronic load disclosed in the embodiment of the present invention；
Fig. 2 is the circuit diagram of the disclosed another kind of adjustable constant-flow electronic load of the embodiment of the present invention；
Fig. 3 is the circuit diagram of a kind of overvoltage crowbar disclosed in the embodiment of the present invention；
Fig. 4 is the circuit diagram of a kind of current foldback circuit disclosed in the embodiment of the present invention。
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments。Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under not making creative work premise, broadly fall into the scope of protection of the invention。
The embodiment of the invention discloses a kind of adjustable constant-flow electronic load, to realize the checking of the constant drive current to drive circuit。
Referring to Fig. 1, the circuit diagram of a kind of adjustable constant-flow electronic load disclosed in the embodiment of the present invention, adjustable constant-flow electronic load includes:
M adjustable constant-flow branch road 01, the input of each adjustable constant-flow branch road 01 is connected with the outfan of drive circuit 02 to be measured, and M is positive integer, and adjustable constant-flow branch road 01 includes:
Linear voltage regulator 001 and N number of diverter branch 002, the power resistor R that diverter branch 002 includes being connected in series is positive integer with switch K, N；
The input of linear voltage regulator 001 is connected with the outfan of drive circuit 02 to be measured as the input of adjustable constant-flow branch road 01, the output voltage terminal of linear voltage regulator 001 links earth terminal by each diverter branch 002, and the grounding ports of linear voltage regulator 001 connects earth terminal。
It should be noted that linear voltage regulator 001 has the characteristic that output voltage is constant, there is the characteristic that output electric current is equal with input current simultaneously。
In Fig. 1, when all of switch K all closes, according to the characteristic that linear voltage regulator 001 output voltage is constant, it is assumed that the output voltage of linear voltage regulator 001 is Vout1, the output electric current I of linear voltage regulator 001out1=N × Vout1÷ R, exports, according to linear voltage regulator 001, the characteristic that electric current is equal with input current, then the input current I of linear voltage regulator 001in=Iout1。
When adjustable constant-flow Electronic Negative is loaded with M identical adjustable constant-flow branch road 01 parallel connection, the input current I=M × I of adjustable constant-flow electronic loadin, i.e. I=M × N × Vout1÷ R, now input current I is the maximum constant-current of this adjustable constant-flow electronic load。
By regulating M × N number of switch K, control to access the quantity of power resistor R of linear voltage regulator 001 output voltage terminal, the input current I of adjustable constant-flow electronic load can be realized from Vout1÷ R to M × N × Vout1Adjustment between ÷ R。
In summary it can be seen, adjustable constant-flow electronic load provided by the invention, including M adjustable constant-flow branch road 01, each adjustable constant-flow branch road 01 include linear voltage regulator 001 and N number of by power resistor R and switch K be connected in series the diverter branch 002 formed, the input of linear voltage regulator 001 is connected with the outfan of drive circuit 02 to be measured, and the output voltage terminal of linear voltage regulator 001 connects earth terminal by each diverter branch 002。When accessing the quantity of power resistor R of linear voltage regulator 001 output voltage terminal and being constant, according to the characteristic that linear voltage regulator 001 output voltage is constant, the output electric current of linear voltage regulator 001 is also constant, exporting, according to linear voltage regulator 001, the characteristic that electric current is equal with input current, the input current of linear voltage regulator 001 is also constant。Therefore, no matter whether the input voltage of linear voltage regulator 001 changes, and the input current of linear voltage regulator 001 all keeps constant, thus realizing constant current function；By regulating switch K, control to access the power resistor R quantity of linear voltage regulator 001 output voltage terminal, it is achieved the adjustment to constant current numerical value。Therefore, adjustable constant-flow electronic load provided by the invention can realize the checking of the constant drive current to drive circuit, thus solving the problems of the prior art。
For optimizing above-described embodiment further, referring to Fig. 2, the circuit diagram of a kind of adjustable constant-flow electronic load that another embodiment of the present invention provides, on the basis of embodiment illustrated in fig. 1, also include: overvoltage crowbar 03；
The input of overvoltage crowbar 03 is connected with the outfan of drive circuit 02 to be measured; the outfan of overvoltage crowbar 03 is connected with the input of linear voltage regulator 001, and overvoltage crowbar 03 is for limiting the input voltage maximum operating voltage less than linear voltage regulator 001 of linear voltage regulator 001。
For further illustrating the operation principle of overvoltage crowbar 03, referring to Fig. 3, the circuit diagram of a kind of overvoltage crowbar that the embodiment of the present invention provides, overvoltage crowbar 03 includes:
First reference voltage circuit 031, bleeder circuit the 032, first comparator circuit 033 and first control circuit 034；
Wherein:
The input of the first reference voltage circuit 031 is connected with the outfan of drive circuit 02 to be measured, the outfan of the first reference voltage circuit 031 and the positive input terminal of the first comparator circuit 033 connect, and the first reference voltage circuit 031 is for exporting the first reference voltage to the first comparator circuit 033；
It should be noted that the first reference voltage is not higher than the maximum operating voltage of linear voltage regulator 001。
The input of bleeder circuit 032 is connected with the outfan of described drive circuit 02 to be measured, the outfan of bleeder circuit 032 and the negative input end of the first comparator circuit 033 connect, bleeder circuit 032 for carrying out dividing potential drop to the voltage of the output of described drive circuit 02 to be measured, and exports the voltage after dividing potential drop to the first comparator circuit 033；
First comparator circuit 033 is for comparing the voltage after described dividing potential drop and described first reference voltage, and when the voltage after described dividing potential drop is lower than described first reference voltage, the first comparator circuit 033 exports high level；When the voltage after described dividing potential drop is higher than described first reference voltage, the first comparator circuit 033 output low level；
The input of first control circuit 034 is connected with the outfan of described drive circuit to be measured, the outfan controlling end and the first comparator circuit 033 of first control circuit 034 connects, the outfan of first control circuit 034 is connected with the input of linear voltage regulator 001, when the first comparator circuit 033 exports high level, first control circuit 034 normal operation；When the first comparator circuit 033 output low level, first control circuit 034 disconnects the connection between the outfan of described drive circuit to be measured, it is achieved the overvoltage protection to linear voltage regulator 001。
Concrete, the first reference voltage circuit 031 includes: resistance R1 and stabilivolt D1；
One end of resistance R1 is connected with the outfan of drive circuit 02 to be measured as the input of the first reference voltage circuit 031, the other end of resistance R1 connects the negative electrode of stabilivolt D1, the anode of stabilivolt D1 connects earth terminal, and the common port of resistance R1 and stabilivolt D1 connects the positive input terminal of the first comparator circuit 033 as the outfan of the first reference voltage circuit 031。
Bleeder circuit 032 includes: the first divider resistance R2 and the second divider resistance R3；
One end of first divider resistance R2 connects the outfan of drive circuit 02 to be measured, the other end of the first divider resistance R2 connects earth terminal by the second divider resistance R3, and the common port of the first divider resistance R2 and the second divider resistance R3 connects as the outfan of bleeder circuit 032 and the negative input end of the first comparator circuit 033。
First comparator circuit 033 includes: comparator UIC1, feedback resistance R4 and resistance R5；
The negative input end of comparator UIC1 is connected with the outfan of bleeder circuit 032, the outfan of the positive input terminal of comparator UIC1 and the first reference voltage circuit 031 connects, and the first reference voltage that comparator UIC1 exports for the voltage after the dividing potential drop that exported by bleeder circuit 032 and the first reference voltage circuit 031 compares；
One end of feedback resistance R4 is connected with the positive input terminal of comparator UIC1, and the other end of feedback resistance R4 is connected with the outfan of comparator UIC1；
One end of resistance R5 is connected with the outfan of comparator UIC1, and the other end of resistance R5 is connected with the control end of first control circuit 034 as the outfan of the first comparator circuit 033。
First control circuit 034 includes: metal-oxide-semiconductor Q1, audion Q2, resistance R7 and resistance R6；
The input of metal-oxide-semiconductor Q1 is connected with the outfan of drive circuit 02 to be measured, and the outfan of metal-oxide-semiconductor Q1 is connected with the input of linear voltage regulator 001, and the end that controls of metal-oxide-semiconductor Q1 connects earth terminal by resistance R6, the audion Q2 being connected in series；
One end of resistance R7 connects the input of metal-oxide-semiconductor Q1, and the other end of resistance R7 connects the common port of metal-oxide-semiconductor Q1 and resistance R6；
The end that controls of audion Q2 connects the outfan of the first comparator circuit 033。
When the first comparator circuit 033 exports high level, audion Q2 turns on, and metal-oxide-semiconductor Q1 turns on, first control circuit 034 normal operation；When the first comparator circuit 033 output low level, audion Q2 closes, and metal-oxide-semiconductor Q1 closes, and first control circuit 034 disconnects the connection between the outfan of described drive circuit to be measured, it is achieved the overvoltage protection to linear voltage regulator 001。
For optimizing above-described embodiment further, also include: circuit overcurrent protection 04；
The input of circuit overcurrent protection 04 is connected with the outfan of drive circuit 02 to be measured; the outfan of circuit overcurrent protection 04 is connected with the input of linear voltage regulator 001, and circuit overcurrent protection 04 is for limiting the input current the highest input current less than linear voltage regulator 001 of linear voltage regulator 001。
For further illustrating the operation principle of circuit overcurrent protection 04, referring to Fig. 4, the circuit diagram of a kind of circuit overcurrent protection that the embodiment of the present invention provides, circuit overcurrent protection 04 includes:
Second reference voltage circuit 041, sensor circuit the 042, second comparator circuit 043 and second control circuit 044；
Wherein:
The input of the second reference voltage circuit 041 is connected with the outfan of drive circuit 02 to be measured, the outfan of the second reference voltage circuit 041 and the positive input terminal of the second comparator circuit 043 connect, and the second reference voltage circuit 041 is for exporting the second reference voltage to the second comparator circuit 043；
It should be noted that the second reference voltage is not higher than the maximum operating voltage of linear voltage regulator 001。
The input of sensor circuit 042 is connected with the outfan of drive circuit 02 to be measured, the outfan of sensor circuit 042 and the negative input end of the second comparator circuit 043 connect, sensor circuit 042 for converting voltage signal to by the current signal that drive circuit 02 to be measured exports, and exports the voltage being converted to the second comparator 043；
Second comparator 043 compares for voltage and the second reference voltage exported by sensor circuit 042, and when described voltage is lower than described second reference voltage, the second comparator circuit 043 exports high level；When described voltage is higher than described second reference voltage, the second comparator circuit 043 output low level；
The input of second control circuit 044 is connected with the outfan of drive circuit 02 to be measured, the outfan controlling end and the second comparator circuit 043 of second control circuit 044 connects, the outfan of second control circuit 044 is connected with the input of linear voltage regulator 001, when the second comparator circuit 043 exports high level, second control circuit 044 normal operation；When the second comparator circuit 043 output low level, second control circuit 044 disconnects the connection between the outfan of drive circuit to be measured 02, it is achieved the overcurrent protection to linear voltage regulator 001。
Concrete, the second reference voltage circuit 041 includes: resistance R8 and stabilivolt D2；
One end of resistance R8 is connected with the outfan of drive circuit 02 to be measured as the input of the second reference voltage circuit 041, the other end of resistance R8 connects the negative electrode of stabilivolt D2, the anode of stabilivolt D2 connects earth terminal, and the common port of resistance R8 and stabilivolt D1 connects the positive input terminal of the second comparator circuit 043 as the outfan of the second reference voltage circuit 041。
Sensor circuit 042 selects Hall element。
Second comparator circuit 043 includes: comparator UIC2, feedback resistance R9 and resistance R10；
The negative input end of comparator UIC2 is connected with the outfan of sensor circuit 042, the positive input terminal of comparator UIC2 and the outfan of the second reference voltage circuit 041 connect, and comparator UIC2 compares for outfan second reference voltage of the voltage exported by sensor circuit 042 and the second reference voltage circuit 041；
One end of feedback resistance R9 is connected with the positive input terminal of comparator UIC2, and the other end of feedback resistance R9 is connected with the outfan of comparator UIC2；
One end of resistance R10 is connected with the outfan of comparator UIC2, and the other end of resistance R10 is connected with the control end of second control circuit 044 as the outfan of the second comparator circuit 043。
Second control circuit 044 includes: metal-oxide-semiconductor Q3, audion Q4, resistance R11 and resistance R12；
The input of metal-oxide-semiconductor Q3 is connected with the outfan of drive circuit 02 to be measured, and the outfan of metal-oxide-semiconductor Q3 is connected with the input of linear voltage regulator 001, and the end that controls of metal-oxide-semiconductor Q3 connects earth terminal by resistance R12, the audion Q4 being connected in series；
One end of resistance R11 connects the input of metal-oxide-semiconductor Q3, and the other end of resistance R11 connects the common port of metal-oxide-semiconductor Q3 and resistance R12；
The end that controls of audion Q4 connects the outfan of the second comparator circuit 043。
When the second comparator circuit 043 exports high level, audion Q4 turns on, and metal-oxide-semiconductor Q3 turns on, second control circuit 044 normal operation；When the second comparator circuit 043 output low level, audion Q4 closes, and metal-oxide-semiconductor Q3 closes, and the second comparator circuit 043 disconnects the connection between the outfan of described drive circuit to be measured, it is achieved the overcurrent protection to linear voltage regulator 001。
Preferably, linear voltage regulator 001 is low pressure difference linear voltage regulator。
For optimizing above-described embodiment further, also include: radiating module (not shown)；
Radiating module is as the fixing parts of linear voltage regulator 001 with power resistor R, for linear voltage regulator 001 and power resistor R are dispelled the heat。
Preferably, radiating module selects heat sink。
Wherein, the quantity basis of heat sink is actually needed and determines, for instance, when selecting a piece of heat sink, all of for adjustable constant-flow electronic load linear voltage regulator 001 and power resistor R can be arranged on this heat sink；When selecting the heat sink with adjustable constant-flow branch road 01 equal number, each heat sink arranges the linear voltage regulator 001 in an adjustable constant-flow branch road 01 and all power resistor R, and the present invention does not limit at this。
Finally, it can further be stated that, in this article, the relational terms of such as first and second or the like is used merely to separate an entity or operation with another entity or operating space, and not necessarily requires or imply the relation that there is any this reality between these entities or operation or sequentially。And, term " includes ", " comprising " or its any other variant are intended to comprising of nonexcludability, so that include the process of a series of key element, method, article or equipment not only include those key elements, but also include other key elements being not expressly set out, or also include the key element intrinsic for this process, method, article or equipment。When there is no more restriction, statement " including ... " key element limited, it is not excluded that there is also other identical element in including the process of described key element, method, article or equipment。
In this specification, each embodiment adopts the mode gone forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar portion mutually referring to。
Described above to the disclosed embodiments, makes professional and technical personnel in the field be capable of or uses the present invention。The multiple amendment of these embodiments be will be apparent from for those skilled in the art, and generic principles defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments。Therefore, the present invention is not intended to be limited to the embodiments shown herein, and is to fit to the widest scope consistent with principles disclosed herein and features of novelty。
Claims (7)
1. an adjustable constant-flow electronic load, it is characterised in that including: M adjustable constant-flow branch road, each input of described adjustable constant-flow branch road is connected with the outfan of drive circuit to be measured, and M is positive integer, and described adjustable constant-flow branch road includes:
Linear voltage regulator and N number of diverter branch, described diverter branch includes the power resistor and the switch that are connected in series, and N is positive integer；
The input of described linear voltage regulator is connected with the outfan of described drive circuit to be measured as the input of described adjustable constant-flow branch road, the output voltage terminal of described linear voltage regulator connects earth terminal by each described diverter branch, and the grounding ports of described linear voltage regulator connects earth terminal。
2. adjustable constant-flow electronic load according to claim 1, it is characterised in that also include: overvoltage crowbar；
The input of described overvoltage crowbar is connected with the outfan of described drive circuit to be measured; the outfan of described overvoltage crowbar is connected with the input of described linear voltage regulator, and described overvoltage crowbar is for limiting the input voltage maximum operating voltage less than described linear voltage regulator of described linear voltage regulator。
3. adjustable constant-flow electronic load according to claim 2, it is characterised in that described excess voltage protection includes:
First reference voltage circuit, bleeder circuit, the first comparator circuit and first control circuit；
The input of described first reference voltage circuit is connected with the outfan of described drive circuit to be measured, the outfan of described first reference voltage circuit is connected with the positive input terminal of described first comparator circuit, and described first reference voltage circuit is for exporting the first reference voltage to described first comparator circuit；
The input of described bleeder circuit is connected with the outfan of described drive circuit to be measured, the outfan of described bleeder circuit is connected with the negative input end of described first comparator circuit, described bleeder circuit for carrying out dividing potential drop to the voltage of the output of described drive circuit to be measured, and exports the voltage after dividing potential drop to described first comparator circuit；
Described first comparator circuit is for comparing the voltage after described dividing potential drop and described first reference voltage, when the voltage after described dividing potential drop is lower than described first reference voltage, and described first comparator circuit output high level；When the voltage after described dividing potential drop is higher than described first reference voltage, described first comparator circuit output low level；
The input of described first control circuit is connected with the outfan of described drive circuit to be measured, the end that controls of described first control circuit is connected with the outfan of described first comparator circuit, the outfan of described first control circuit is connected with the input of described linear voltage regulator, when described first comparator circuit output high level, described first control circuit normal operation；When described first comparator circuit output low level, described first control circuit disconnects the connection between the outfan of described drive circuit to be measured, it is achieved the overvoltage protection to described linear voltage regulator。
4. adjustable constant-flow electronic load according to claim 1, it is characterised in that also include: circuit overcurrent protection；
The input of described circuit overcurrent protection is connected with the outfan of described drive circuit to be measured; the outfan of described circuit overcurrent protection is connected with the input of described linear voltage regulator, and described circuit overcurrent protection is for limiting the input current the highest input current less than described linear voltage regulator of described linear voltage regulator。
5. adjustable constant-flow electronic load according to claim 4, it is characterised in that described circuit overcurrent protection includes:
Second reference voltage circuit, sensor circuit, the second comparator circuit and second control circuit；
The input of described second reference voltage circuit is connected with the outfan of described drive circuit to be measured, the outfan of described second reference voltage circuit is connected with the positive input terminal of described second comparator circuit, and described second reference voltage circuit is for exporting the second reference voltage to described second comparator circuit；
The input of described sensor circuit is connected with the outfan of described drive circuit to be measured, the outfan of described sensor circuit is connected with the negative input end of described second comparator circuit, described sensor circuit for converting voltage signal to by the current signal that described drive circuit to be measured exports, and voltage output extremely described second comparator that will be converted to；
Described second comparator circuit is for comparing described voltage and described second reference voltage, when described voltage is lower than described second reference voltage, and described second comparator circuit output high level；When described voltage is higher than described second reference voltage, described second comparator circuit output low level；
The input of described second control circuit is connected with the outfan of described drive circuit to be measured, the end that controls of described second control circuit is connected with the outfan of described second comparator circuit, the outfan of described second control circuit is connected with the input of described linear voltage regulator, when described second comparator circuit output high level, described second control circuit normal operation；When described second comparator circuit output low level, described second control circuit disconnects the connection between the outfan of described drive circuit to be measured, it is achieved the overcurrent protection to described linear voltage regulator。
6. adjustable constant-flow electronic load according to claim 1, it is characterised in that also include: radiating module；
Described radiating module is as the fixing parts of described linear voltage regulator and described power resistor, for described linear voltage regulator and described power resistor are dispelled the heat。
7. adjustable constant-flow electronic load according to claim 1, it is characterised in that described linear voltage regulator is low pressure difference linear voltage regulator。
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| CN114035100A (en) * | 2021-12-03 | 2022-02-11 | 深圳市鼎阳科技股份有限公司 | Steady-state output control method for electronic load and electronic load |
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| CN105700611B (en) | 2017-11-14 |
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Effective date of registration: 20200108 Address after: 400023, No. 260, Jianxin East Road, Jiangbei District, Chongqing Patentee after: Chongqing Chang'an Automobile Co., Ltd. Address before: 400023, No. 260, Jianxin East Road, Jiangbei District, Chongqing Co-patentee before: Chongqing Chang'an New Energy Automobile Co., Ltd. Patentee before: Chongqing Chang'an Automobile Co., Ltd. |