CN109062304A - A kind of constant current load circuit and a kind of electronic load and related system - Google Patents
A kind of constant current load circuit and a kind of electronic load and related system Download PDFInfo
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
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Abstract
The invention discloses a kind of constant current load circuits and a kind of electronic load and related system.Wherein constant current load circuit, comprising: main operational amplifier, gate driving, MOS device and current detecting unit；Main operational amplifier, non-inverting input terminal ground connection, inverting input terminal are connected to the first DA output end through input resistance and are connected to current detecting unit through feedback resistance, and output end connects gate driving；The grid of MOS device connects gate driving, and drain electrode connects tested one pole of power supply, and source electrode connects current detecting unit；Current detecting unit one end ground connection, one end of ground connection connect another pole of tested power supply.It can be realized Constant Current Load, tested power supply protected not to be damaged；It is safe and reliable simultaneously, no bias current, when tested power supply is without exporting, also no-load current and external bias voltage.
Description
Technical field
The present invention relates to electronic testing instrument field, in particular to a kind of constant current load circuit and a kind of electronic load and phase
Relationship system.
Background technique
When to DC/DC power module parameter testing, need to export to tested power supply as defined in load, load can with resistance and
Constant-current source is realized.It is reliable that payload security is done with resistance, but export electric current to change with output voltage, and adjust difficulty, no
It is suitble to the requirement tested automatically；When being loaded with active constant-current source, load current is constant, PLC technology, but constant-current source is in quilt
It will appear the voltage opposite with tested power supply output polarity when surveying power supply without output, be easily damaged tested power module.
As it can be seen that either doing load when testing tested power supply with resistance or being loaded with constant-current source, all deposited
In shortcoming, it is not able to satisfy the needs of power safety test, cannot achieve the PLC technology of load current, it cannot be guaranteed that negative
It carries electric current not change with the variation of tested electric power output voltage, both cannot achieve constant current.
Summary of the invention
In view of the above problems, it proposes on the present invention overcomes the above problem or at least be partially solved in order to provide one kind
State a kind of constant current load circuit and a kind of electronic load and related system of problem.
In a first aspect, the embodiment of the present invention provides a kind of constant current load circuit, comprising: main operational amplifier, gate driving,
MOS device and current detecting unit；
The main operational amplifier, non-inverting input terminal ground connection, it is defeated that inverting input terminal through input resistance Rs is connected to the first DA
Outlet and current detecting unit is connected to through feedback resistance Rf, output end connects the gate driving；
The grid of the MOS device connects the gate driving, and drain electrode connects tested one pole of power supply, and source electrode connects electric current inspection
Survey unit；
Current detecting unit one end ground connection, one end of ground connection connects another pole of the tested power supply.
In some alternative embodiments, the MOS device, comprising: N-channel MOS pipe MOS1 and P-channel metal-oxide-semiconductor MOS2,
Concatenated diode D1 and D2；
The MOS1 is connected with the grid of the MOS2, and connect with the gate driving；
The MOS1 is connected with the source electrode of the MOS2, and connect with the current detecting unit；
The cathode of D1 and MOS1 drain electrode connect, and anode and the MOS2 drain electrode of D2 connects, and the anode of D1 is with D2's
Cathode is connected, and connect with tested one pole of power supply.
In some alternative embodiments, the first DA output end includes: the first DAC conversion module；
Described first DAC conversion module one end connects number bus, and the other end connects the input resistance Rs.
In some alternative embodiments, the gate driving includes:
NPN triode, PNP triode, resistance R3 and resistance R4；
The grounded collector of the collector of the NPN triode and the PNP triode；
The base stage of the base stage and PNP triode of the one end resistance R3 and NPN triode connects, and the other end is put with the main operation
The output end connection of big device；
The emitter of the emitter and PNP triode of the one end resistance R4 and NPN triode connects, the other end and the MOS
The grid of device connects.
In some alternative embodiments, the constant current load circuit further includes following amplifier unit, is used for the electricity
The boost in voltage of stream detection unit input exports after reverse phase.
It is in some alternative embodiments, described that follow amplifier unit include: operational amplifier U, feedback resistance R2 and defeated
Enter resistance R1；
The inverting input terminal of the operational amplifier U is connected by feedback resistance R2 with its output end, homophase input termination
Ground, output end are connect with feedback resistance Rf；
The one end the input resistance R1 is connect with the current detecting unit, and the other end is anti-with the operational amplifier U's
The connection of phase input terminal.
Second aspect, the embodiment of the present invention provide a kind of electronic load, comprising:
In some alternative embodiments, comprising: main operational amplifier, gate driving, MOS device, current detecting unit,
Gating switch and switch control unit；
The main operational amplifier, non-inverting input terminal ground connection, inverting input terminal are connected to gating switch through input resistance Rs
And it is connected to current detecting unit through feedback resistance Rf, output end connects the gate driving；
The grid of the MOS device connects the gate driving, and drain electrode connects tested one pole of power supply, and source electrode connects electric current inspection
Survey unit；
Current detecting unit one end ground connection, one end of ground connection connects another pole of the tested power supply；
The switch control unit input terminal connects tested power supply, the 2nd DA output end and the 3rd DA output end, output end
According to the input signal of input terminal control the gating switch coupling cock control unit feedback network or connection the first DA it is defeated
Outlet.
In some alternative embodiments, the first DA output end includes the first DAC conversion module, the first DAC
Conversion module one end connects number bus, and the other end connect or breaks with the gating switch under switch control unit control
It opens.
In some alternative embodiments, the switch control unit includes: comparator and multiplier；
The multiplier input is separately connected the 3rd DA output end and tested power supply, and output end connects comparator；
The comparator non-inverting input terminal connects the 2nd DA output end, and inverting input terminal connects multiplier, output end connection
Gating switch.
In some alternative embodiments, the 2nd DA output end includes the 2nd DAC conversion module, the 2nd DAC
Conversion module one end connects number bus, and the other end connects the non-inverting input terminal of the comparator；
The 3rd DA output end includes the 3rd DAC conversion module, and described 3rd DAC conversion module one end connects the number
Word bus, the other end connect the multiplier.
In some alternative embodiments, the MOS device includes: N-channel MOS pipe MOS1 and P-channel metal-oxide-semiconductor MOS2,
Concatenated diode D1 and D2；
The MOS1 is connected with the grid of the MOS2, and connect with the gate driving；
The MOS1 is connected with the source electrode of the MOS2, and connect with the current detecting unit；
The cathode of D1 and MOS1 drain electrode connect, and anode and the MOS2 drain electrode of D2 connects, and the anode of D1 is with D2's
Cathode is connected, and connect with tested one pole of power supply.
In some alternative embodiments, the gate driving includes:
NPN triode, PNP triode, resistance R3 and resistance R4；
The grounded collector of the collector of the NPN triode and the PNP triode；
The base stage of the base stage and PNP triode of the one end resistance R3 and NPN triode connects, and the other end is put with the main operation
The output end connection of big device；
The emitter of the emitter and PNP triode of the one end resistance R4 and NPN triode connects, the other end and the MOS
The grid of device connects.
In some alternative embodiments, the electronic load further includes following amplifier unit, for examining the electric current
It surveys the boost in voltage of unit input, export after reverse phase.
It is in some alternative embodiments, described that follow amplifier unit include: operational amplifier U, feedback resistance R2 and defeated
Enter resistance R1；
The inverting input terminal of the operational amplifier U is connected by feedback resistance R2 with its output end, homophase input termination
Ground, output end are connect with feedback resistance Rf；
The one end the input resistance R1 is connect with the current detecting unit, and the other end is anti-with the operational amplifier U's
The connection of phase input terminal.
The third aspect, the embodiment of the present invention provide a kind of power parameter test macro, comprising: tested power supply and any of the above-described
The electronic load.
In some alternative embodiments, the switch control unit judges whether the output voltage of the tested power supply reaches
To rated output voltage, when tested electric power output voltage is not up to rated output voltage, controls the gating switch connection and open
Close the feedback network of control unit；When tested electric power output voltage reaches rated output voltage, the gating switch is controlled, is cut
Change to the first DA output end of connection.
The beneficial effect of above-mentioned technical proposal provided in an embodiment of the present invention includes at least:
1, constant current load circuit and electronic load provided in an embodiment of the present invention are controlled using the output of main operational amplifier
The grid voltage of MOS device, MOS device according to the grid voltage of input terminal come the drain current of control output end, to realize
Constant Current Load.Safe and reliable simultaneously, the drain electrode of MOS device is without bias supply, and power supply is provided by the output for being tested power supply, when tested
When power supply is without output, also no-load current and external bias voltage, will not be damaged to protect and be tested power supply.
2, constant current load circuit and electronic load provided in an embodiment of the present invention, metal-oxide-semiconductor, P ditch of the MOS device by N-channel
Road metal-oxide-semiconductor, concatenated diode D1 and D2 composition, so that the drain electrode of MOS device is connect with the positive or negative pole of tested power supply
Can, it is easy to use, safe.
3, electronic load provided in an embodiment of the present invention is constant-resistance electronics when choosing, which opens up connection, connects switch control unit
Load；When choosing, which opens up connection, connects the first DA output end, the drain electrode of MOS device is loaded to tested power supply output constant current, protects quilt
Power supply is surveyed not to be damaged.
Detailed description of the invention
Attached drawing is used to provide further understanding of the present invention, and constitutes part of specification, with reality of the invention
It applies example to be used to explain the present invention together, not be construed as limiting the invention.In the accompanying drawings:
Fig. 1 is constant current load circuit figure described in the embodiment of the present invention one；
Fig. 2 is the V-I performance diagram of metal-oxide-semiconductor；
Fig. 3 is the specific implementation circuit diagram of constant current load circuit described in the embodiment of the present invention one；
Fig. 4 is the structural schematic diagram of electronic load described in the embodiment of the present invention two；
Fig. 5 is the specific implementation structural schematic diagram of electronic load described in the embodiment of the present invention two.
Specific embodiment
Exemplary embodiments of the present disclosure are described in more detail below with reference to accompanying drawings.Although showing the disclosure in attached drawing
Exemplary embodiment, it being understood, however, that may be realized in various forms the disclosure without should be by embodiments set forth here
It is limited.On the contrary, these embodiments are provided to facilitate a more thoroughly understanding of the present invention, and can be by the scope of the present disclosure
It is fully disclosed to those skilled in the art.
To solve the above-mentioned problems, the embodiment of the present invention provides a kind of constant current load circuit and a kind of electronic load and related
System when being used for power supply class device detection, can be realized Constant Current Load, and tested power supply is protected not to be damaged；It is safe and reliable simultaneously,
Without bias current, when tested power supply is without output, also no-load current and external bias voltage.
Embodiment one
Shown in referring to Fig.1, the constant current load circuit of the offer of the embodiment of the present invention one, comprising: main operational amplifier, grid drive
Dynamic, MOS device and current detecting unit；The wherein non-inverting input terminal ground connection of main operational amplifier, inverting input terminal is through input electricity
Resistance Rs is connected to the first DA output end and is connected to current detecting unit through feedback resistance Rf, and output end connects gate driving；MOS
The grid G of device connects gate driving, and drain D connects tested one pole of power supply, and source S connects current detecting unit；Current detecting
Unit one end ground connection, one end of ground connection connect another pole of tested power supply.
Grid voltage of the above-mentioned constant current load circuit using the output control MOS device of main operational amplifier, MOS device root
Carry out the drain current of control output end according to the grid voltage of input terminal, to realize Constant Current Load.Wherein, the drain electrode of MOS device
Without bias supply, power supply is provided by the output for being tested power supply, and the power supply of tested power supply is provided by power output end；When power supply exports
When end is without output, it is tested power supply without output, MOS device also no-load current and external bias voltage, to protect tested power supply
It will not be damaged.
According to V-I characteristic of the MOS device under the control of different grid voltages, (about etc. to a given drain voltage VD
In grid voltage VDS) and drain current ID, there can be a corresponding grid voltage VGS.Referring to shown in Fig. 2, for example, setting VD
=5V, ID=10A, corresponding grid voltage VGS is between 5.0V to 6V.Another characteristic of MOS device is drain current ID
Equal to source current IS, drain current ID can be detected in the source electrode of MOS device using this characteristic.
Electric current IS is converted into voltage by current detecting unit, because the closed-loop control characteristic of operational amplifier, main operation are put
The voltage that big device exports current detecting unit is as feedback quantity and the voltage of setting (the voltage Vda of the first DA output end output)
Operation, the grid voltage variation of the output control MOS device of main operational amplifier, is finally setting drain current ID stabilization
Value, and become constant current state.
Electric current in this constant current state meets following formula:
ID=Vda* (Rf/Rs) * B (1)
In above formula (1), parameter B is the voltage conversion coefficient of current detecting unit, is a constant.Resistance Rf and Rs are also
Constant, therefore ID only changes with Vda.As long as setting Vda, corresponding ID is obtained, to realize ID PLC technology.
The electric current ID polarity different problems required for being tested the output of power supply opposed polarity, as long as selecting opposite polarity
Metal-oxide-semiconductor, while invert the polarity of Vda.
In one embodiment, it can be, referring to shown in Fig. 3, above-mentioned MOS device includes: N-channel MOS pipe MOS1 and P ditch
Road metal-oxide-semiconductor MOS2, concatenated diode D1 and D2；MOS1 is connected with the grid G of MOS2, and connect with gate driving；MOS1 and
The source S of MOS2 is connected, and connect with current detecting unit；The cathode of D1 is connect with MOS1 drain D, and anode and the MOS2 of D2 leaks
The anode of pole D connection, D1 is connected with the cathode of D2, and connect with tested one pole of power supply.
When MOS device connection be the anode of tested power supply when, acted on by the admittance of D1 and the baffle of D2, electric current only exists
MOS1 circulation, MOS2 disconnects in circuit, and the voltage Vda of the first DA output end output is positive, therefore the drain electrode of MOS1 is to quilt
It surveys power supply and exports negative sense Constant Current Load, at this point, load outputs 1 are low potential output end, load outputs 2 are high potential output
End；
When MOS device connection be the cathode of tested power supply when, acted on by the admittance of D2 and the baffle of D1, electric current only exists
MOS2 circulation, MOS1 disconnects in circuit, and the voltage Vda of the first DA output end output is negative, therefore the drain electrode of MOS2 is to quilt
It surveys power supply and exports positive Constant Current Load, at this point, load outputs 1 are high potential output end, load outputs 2 are low potential output
End.
Above-mentioned load outputs 1 can be the output pin of measured device, correspondingly, load outputs 2 are measured device
Ground pin.
Constant current load circuit provided in this embodiment, easy to use, the drain electrode of MOS device and the anode of tested power supply or negative
Pole connection；It when tested power supply reaches rated output, is loaded to tested power supply output constant current, tested power supply is protected not damaged
It is bad.
In one embodiment, it can be, referring to shown in Fig. 3, the first DA output end includes the first DAC conversion module；The
One DAC conversion module one end connects number bus, and the other end connects input resistance Rs.Number bus is used to convert to the first DAC
Module sends digital signal, and the control signal from number bus is converted to an analog voltage by the first DAC conversion module
Vda, the analog voltage Vda and feedback voltage that main operational amplifier is inputted according to the first DAC conversion module carry out operation, output
The variation of the grid voltage of MOS device is controlled by gate driving, to control the drain electrode output constant current load of MOS device.
In one embodiment, it can be, referring to shown in Fig. 3, gate driving includes: NPN triode, PNP triode, electricity
Hinder R3 and resistance R4；The collector of NPN triode and the grounded collector of PNP triode；The one end resistance R3 and NPN triode
Base stage is connected with the base stage of PNP triode, the output end connection of the other end and main operational amplifier；The one end resistance R4 and NPN tri-
The emitter of pole pipe is connected with the emitter of PNP triode, the grid connection of the other end and MOS device.
Since the electric current IS for flowing through current detecting unit under normal conditions is smaller, therefore the conversion voltage of current detecting unit
VIsout value is also smaller, and the computational accuracy of main operational amplifier will receive influence；There are also the conversion electricity of current detecting unit output
The analog voltage Vda phase that pressure VIsout is exported with the first DA output end is opposite.Therefore in one embodiment, it can be,
Referring to shown in Fig. 3, above-mentioned constant current load circuit can also include following amplifier unit, the electricity for inputting current detecting unit
After pressing VIsout boosting, reverse phase, Vis is exported.Following amplifier unit may include: operational amplifier U, feedback resistance R2 and input
Resistance R1；The inverting input terminal of operational amplifier U is connected by feedback resistance R2 with its output end, non-inverting input terminal ground connection, defeated
Outlet is connect with feedback resistance Rf；The one end input resistance R1 is connect with current detecting unit, and the other end is anti-with operational amplifier U's
The connection of phase input terminal.
The electric current for flowing through current detecting unit meets following formula:
In above formula (2), b is the voltage conversion coefficient of current detecting unit, and R1/R2, Rf/Rs are resistance ratios, are normal
Amount.Therefore I only changes with Vda.As long as setting Vda, corresponding I is obtained.
As Vda=0, can be released by operational amplifier working principle: VIsout=Vf=Vdas=0, wherein VIsout
The conversion output voltage of current detecting unit, Vf and Vdas are the voltage at the both ends resistance Rf and Rs respectively.As Vda=0, Rs and
The voltage at the both ends Rf is also 0, that is, Vis=0, so, VIsout is also 0, therefore releases electric current I=0.
Such as current detecting unit is 0~20A, and as I=+/- 20A, VIsout=+/- 4V (b=0.2), Vda output
For 0~+/- 10V, suitable resistance R1, R2, Rf, Rs are selected, so that I=- /+Vda*2.Then, the first DAC conversion module is set
Output voltage Vda, so that it may constant load current of the setting from -20A to+20A, setting accuracy depend primarily on resistance precision and
The digit of first DAC conversion module.
Embodiment two
Referring to shown in Fig. 4, electronic load provided by Embodiment 2 of the present invention, comprising: main operational amplifier, gate driving,
MOS device, current detecting unit, gating switch and switch control unit；The non-inverting input terminal of main operational amplifier is grounded, reverse phase
Input terminal is connected to gating switch through input resistance Rs and is connected to current detecting unit through feedback resistance Rf, and output end connects grid
Pole driving；The grid G of MOS device connects gate driving, and drain D connects tested one pole of power supply, and source S connects current detecting list
Member；Current detecting unit one end ground connection, one end of ground connection connect another pole of tested power supply；The connection of switch control unit input terminal
Tested power supply, the 2nd DA output end and the 3rd DA output end, output end control gating switch according to the input signal of input terminal and connect
The first DA output end of feedback network or connection of logical switch control unit.
When choosing, which opens up connection, connects switch control unit, electronic load provided in an embodiment of the present invention is constant-resistance Electronic Negative
It carries；When choosing, which opens up connection, connects the first DA output end, working principle is as described in above-described embodiment one, and the drain electrode of MOS device is to quilt
Survey the load of power supply output constant current.
In one embodiment, it can be, the first DA output end includes the first DAC conversion module, the first DAC conversion module
One end connects number bus, and the other end connects or disconnects under switch control unit control with gating switch.
Electronic load provided in this embodiment can reach when being used for power supply class device detection in tested electric power output voltage
It is not only easy to use to specified preceding output constant-resistance load, the output constant current load after tested electric power output voltage reaches specified, but also energy
Tested power supply is protected not to be damaged in test.
Switch control unit can control gating switch by following manner and select connection switch control unit or the first DA
Output end:
In one embodiment, it can be, referring to Figure 5, switch control unit includes: comparator and multiplier；Multiply
Multiplier input terminal is separately connected the 3rd DA output end and tested power supply, and output end connects comparator；Comparator non-inverting input terminal connects
The 2nd DA output end is connect, inverting input terminal connects multiplier, and output end connects gating switch.
In one embodiment, it can be, the 2nd DA output end includes the 2nd DAC conversion module, the 2nd DAC conversion module
One end connects number bus, and the other end connects the non-inverting input terminal of comparator；3rd DA output end includes the 3rd DAC modulus of conversion
Block, the 3rd DAC conversion module one end connect number bus, and the other end connects multiplier.
The output voltage of analog voltage Vx and tested power supply that above-mentioned multiplier is used to input the 3rd DAC conversion module
Vout is multiplied, and result Vw is exported；Above-mentioned comparator be used for compare the 2nd DAC conversion module input analog voltage Vref and
The Vw of multiplier input, passes through connecting or disconnecting for output control gating switch and the first DAC conversion module.When tested power supply is defeated
When Vout is changed by 0 volt to rated value out, the electric current of load circuit is flowed through by following formula:
I=Vw*A=(Vx*Vout) * (Rf/Rs) * B formula (3)
In above formula (3), A and Vx are constant, and electric current I=0 when Vout=0 is increased, load with the output voltage of tested power supply
Output electric current increase.Curent change amplitude can be changed by setting Vx.
Simplified formula (3) obtains:
I*A=Vout formula (4)
Therefore the output voltage Vout of electric current I and tested electric current meets Ohm's law:
R*I=V formula (5)
When Vw is less than Vref, comparator controls gating switch and the first DAC conversion module is in and disconnects shape by output
State, electronic load are equivalent to a resistance, load for constant-resistance；When Vw is more than or equal to Vref, comparator exports reverse phase, control choosing
It opens up pass and is in connection status with the first DAC conversion module, electronic load becomes constant current state；Above-mentioned Vref is less than Vda.
In one embodiment, it can be, above-mentioned electronic load can also include following amplifier unit, for examining electric current
It surveys the boost in voltage of unit input, export after reverse phase.
The above-mentioned specific implementation structure for following amplifier unit, MOS device and gate driving has been described in detail in example 1
It crosses, is not repeated herein.
Based on the same inventive concept, the embodiment of the present invention also provides a kind of power parameter test macro, comprising: tested power supply
With any electronic load as described in embodiment two.
In one embodiment, it can be, switch control unit judges whether the output voltage of tested power supply reaches specified
Output voltage controls gating switch coupling cock control unit when tested electric power output voltage is not up to rated output voltage
Feedback network, electronic load to tested power supply output constant-resistance load；When tested electric power output voltage reaches rated output voltage
When, control gating switch is switched to the first DA output end of connection, and electronic load is loaded to tested power supply output constant current.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
Mind and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (10)
1. a kind of constant current load circuit characterized by comprising main operational amplifier, gate driving, MOS device and electric current inspection
Survey unit；
The main operational amplifier, non-inverting input terminal ground connection, inverting input terminal are connected to the first DA output end through input resistance Rs
And it is connected to current detecting unit through feedback resistance Rf, output end connects the gate driving；
The grid of the MOS device connects the gate driving, and drain electrode connects tested one pole of power supply, and source electrode connects the electric current inspection
Survey unit；
Current detecting unit one end ground connection, one end of ground connection connects another pole of the tested power supply.
2. constant current load circuit as described in claim 1, which is characterized in that the MOS device, comprising: N-channel MOS pipe
MOS1 and P-channel metal-oxide-semiconductor MOS2, concatenated diode D1 and D2；
The MOS1 is connected with the grid of the MOS2, and connect with the gate driving；
The MOS1 is connected with the source electrode of the MOS2, and connect with the current detecting unit；
The cathode of D1 and MOS1 drain electrode connect, and anode and the MOS2 drain electrode of D2 connects, the cathode of the anode and D2 of D1
It is connected, and is connect with tested one pole of power supply.
3. constant current load circuit as described in claim 1, which is characterized in that the gate driving includes:
NPN triode, PNP triode, resistance R3 and resistance R4；
The grounded collector of the collector of the NPN triode and the PNP triode；
The base stage of the base stage and PNP triode of the one end resistance R3 and NPN triode connects, the other end and the main operational amplifier
Output end connection；
The emitter of the emitter and PNP triode of the one end resistance R4 and NPN triode connects, the other end and the MOS device
Grid connection.
4. constant current load circuit as described in any one of claims 1-3, which is characterized in that the constant current load circuit further includes
Amplifier unit is followed, is exported after the boost in voltage, reverse phase for inputting the current detecting unit；
It is described that follow amplifier unit include: operational amplifier U, feedback resistance R2 and input resistance R1；
The inverting input terminal of the operational amplifier U is connected by feedback resistance R2 with its output end, non-inverting input terminal ground connection, defeated
Outlet is connect with feedback resistance Rf；
The one end the input resistance R1 is connect with the current detecting unit, and the reverse phase of the other end and the operational amplifier U is defeated
Enter end connection.
5. a kind of electronic load characterized by comprising main operational amplifier, gate driving, MOS device, current detecting list
Member, gating switch and switch control unit；
The main operational amplifier, non-inverting input terminal ground connection, inverting input terminal are connected to gating switch and warp through input resistance Rs
Feedback resistance Rf is connected to current detecting unit, and output end connects the gate driving；
The grid of the MOS device connects the gate driving, and drain electrode connects tested one pole of power supply, and source electrode connects current detecting list
Member；
Current detecting unit one end ground connection, one end of ground connection connects another pole of the tested power supply；
The switch control unit input terminal connects tested power supply, the 2nd DA output end and the 3rd DA output end, output end according to
The input signal of input terminal controls the first DA output end of feedback network or connection of the gating switch coupling cock control unit.
6. electronic load as claimed in claim 5, which is characterized in that the first DA output end includes the first DAC modulus of conversion
Block, described first DAC conversion module one end connect number bus, the other end under switch control unit control with the choosing
Pass is opened up to connect or disconnect；
Or,
The 2nd DA output end includes the 2nd DAC conversion module, and described 2nd DAC conversion module one end connects number bus,
The other end connects the non-inverting input terminal of the comparator；
Or,
The 3rd DA output end includes the 3rd DAC conversion module, and the 3rd DAC conversion module one end connection number is total
Line, the other end connect the multiplier.
7. electronic load as claimed in claim 5, which is characterized in that the switch control unit includes: comparator and multiplication
Device；
The multiplier input is separately connected the 3rd DA output end and tested power supply, and output end connects comparator；
The comparator non-inverting input terminal connects the 2nd DA output end, and inverting input terminal connects multiplier, output end connection gating
Switch.
8. electronic load as claimed in claim 5, which is characterized in that the MOS device includes: N-channel MOS pipe MOS1 and P
Channel MOS tube MOS2, concatenated diode D1 and D2；
The MOS1 is connected with the grid of the MOS2, and connect with the gate driving；
The MOS1 is connected with the source electrode of the MOS2, and connect with the current detecting unit；
The cathode of D1 and MOS1 drain electrode connect, and anode and the MOS2 drain electrode of D2 connects, the cathode of the anode and D2 of D1
It is connected, and is connect with tested one pole of power supply.
9. such as the described in any item electronic loads of claim 5-8, which is characterized in that the electronic load further includes following amplifier
Unit exports after the boost in voltage, reverse phase for inputting the current detecting unit；
It is described that follow amplifier unit include: operational amplifier U, feedback resistance R2 and input resistance R1；
The inverting input terminal of the operational amplifier U is connected by feedback resistance R2 with its output end, non-inverting input terminal ground connection, defeated
Outlet is connect with feedback resistance Rf；
The one end the input resistance R1 is connect with the current detecting unit, and the reverse phase of the other end and the operational amplifier U is defeated
Enter end connection.
10. a kind of power parameter test macro, comprising: tested power supply and the electronic load as described in claim 5-9 is any；
The switch control unit judges whether the output voltage of the tested power supply reaches rated output voltage, in tested power supply
When output voltage is not up to rated output voltage, the feedback network of the gating switch coupling cock control unit is controlled；Work as quilt
When survey electric power output voltage reaches rated output voltage, the gating switch is controlled, is switched to the first DA output end of connection.
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| CN113472321A (en) * | 2021-06-07 | 2021-10-01 | 杭州领挚科技有限公司 | Constant current pulse source |
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| CN115776231A (en) * | 2022-12-26 | 2023-03-10 | 深圳市诚金晖精密机械有限公司 | High-precision power supply circuit for testing electronic equipment |
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