CN207586783U - A kind of electronic device for current source control - Google Patents
A kind of electronic device for current source control Download PDFInfo
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- CN207586783U CN207586783U CN201721359860.XU CN201721359860U CN207586783U CN 207586783 U CN207586783 U CN 207586783U CN 201721359860 U CN201721359860 U CN 201721359860U CN 207586783 U CN207586783 U CN 207586783U
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Abstract
The utility model discloses a kind of electronic devices for current source control, belong to current source control technology field.The electronic device for current source control of the utility model, including sequentially connected switch power module, current switch module, load blocks and load switch control module, close loop negative feedback control module is further included for when the load switch control module output current conductivity control signal, control the switch power module output constant current, when the load switch control module output current turns off control signal, the switch power module output constant voltage is controlled.The electronic device for current source control of the utility model is switched by controlling switch power module between constant current output pattern and constant pressure output mode, it can adapt to the dynamic change of load, so that switch power module is always worked under specific slave mode, be conducive to the switching of the steady high-speed switch of load.
Description
Technical field
The utility model is related to a kind of electronic devices for current source control, belong to current source control technology field.
Background technology
Current source is a widely used component in circuit, is the common driving power of current sensitive load.Electric current
Responsive type loads, and is common in Light-emitting diode LED, laser diode LD etc., driving power is required to provide in the operating condition steady
Fixed electric current output, stable voltage is provided rather than more common voltage source like that.In fact, current sensitive load requirement
Driving power can be adaptively adjusting output voltage with ensure electric current output stabilization, to overcome the variation of circuit environment, do
It disturbs or even the influence of load resistance variations itself.
Since the mainstream technology of current power supply is Switching Power Supply, most common way is to connect one on loaded line
Then a linear current control unit realizes current control by closed loop feedback signal, and Switching Power Supply be then operated in it is constant
Under the pattern of voltage output, do not influenced by load switch control signal.As shown in Figure 1, linear current control unit usually may be used
To be triode, Darlington transistor etc., the size of loaded line electric current is controlled by closed loop feedback signal, when current sensitive is born
When load needs switching manipulation, such linear current control unit can accomplish relatively good switching speed, can usually accomplish that 10 is micro-
Below second.But the defects of maximum of Fig. 1 schemes, is that the efficiency of entire circuit is not high.Linear current control unit is in order to limit
The electric current of load, it is necessary to consume a big chunk of the power output of Switching Power Supply in vain.To realize more high energy efficiency, it should
Switching Power Supply is provided directly as the pattern of Current Negative Three-Point Capacitance, and Switching Power Supply is allowed to be operated under the pattern of constant current, but this
The speed of Switching Power Supply responding to switch control under pattern is very slow, and an independent switching device is needed quickly to be opened to realize thus
The operation of pass, as shown in Fig. 2 schemes.After the greatest problem of Fig. 2 schemes is switch off current, the working condition of Switching Power Supply is no longer
Normally, the moment that next primary current is caused to be opened, Switching Power Supply will adapt to load circuit again, this can undergo one it is very abnormal
Process just reach stable state.This is because after circuit becomes open circuit from normal load, it is equivalent to load and becomes infinitely great, electricity
The working mechanism in stream source fails immediately, and the working condition of Switching Power Supply necessarily changes, and this state can't be naturally
Lower primary current is suitble to open the requirement of momentary load.When switch off current, if the working strength of Switching Power Supply is also reduced to 0, that
When lower primary current is opened, it is very slow that the electric current of load establishes speed, as shown in Figure 10 a；If the working strength of Switching Power Supply is inclined
It is high, then when electric current is opened, the electric current of load will be there are one overshooting, as shown in fig. lob.Only properly design current turns off
When Switching Power Supply working condition, be likely to realize electric current steady unlatching, make load electric current quickly establish reach setting value
And it does not overshoot.
In order to which Switching Power Supply is allowed to be operated in a most rational state in switch off current, to ensure that lower primary current is opened as possible
Load circuit can be opened steadily when logical, number of patent application：201010505708.4 sampling hold circuit is employed in, passes through sampling
Holding circuit makes Switching Power Supply be operated under memory state.The essence of the patent is exactly to be imitated by the memory of sampling hold circuit
Should, Switching Power Supply is allowed to be always held at working condition when electric current is opened, during switch off current, sampling hold circuit provides a vacation
Negative-feedback signal, and genuine negative-feedback signal has been cut off.But Switching Power Supply is ignorant, still with for negative-feedback signal
Continuous and effective.But in fact, the patented technology can not reach ideal effect, current over pulse phenomenon is still suffered from.This is
Because after switch off current, the load of circuit becomes unloaded, and the working strength of Switching Power Supply does not adjust at this time, may result in
More energy accumulations, the output voltage hurricane for making Switching Power Supply are high.
Utility model content
The purpose of this utility model is to provide it is a kind of for current source control electronic device include switch power module,
Current switch module, load blocks, load switch control module and close loop negative feedback control module, close loop negative feedback control mould
Root tuber exports control signal feedback closed loop negative-feedback signal to switch power module according to load switch control module, so as to control
Switch power module switches between constant current output pattern and constant pressure output mode, can adapt to the dynamic change of load so that
Switch power module is always worked under specific slave mode, is conducive to the switching of the steady high-speed switch of load.
It is as follows that the utility model provides technical solution：
On the one hand, the utility model provides a kind of electronic device for current source control, is opened including sequentially connected
Powered-down source module, current switch module, load blocks and the load switch control module being connect with current switch module, it is special
Sign is, further includes close loop negative feedback control module, and the close loop negative feedback control module connects the Switching Power Supply mould respectively
Block and the load switch control module, for when the load switch control module output current conductivity control signal, control
The switch power module output constant current is made, when the load switch control module output current turns off control signal,
Control the switch power module output constant voltage.
An embodiment according to the present utility model, the close loop negative feedback control module include current operator and feed back submodule
Block, voltage operational feedback submodule and selection control switch submodule, the current operator feedback submodule connect the switch
Power module and the selection control switch submodule, the voltage operational feedback submodule are set to the switch power module
Between the selection control switch submodule, the selection control switch submodule connects the switch power module, described
Load switch control module connects the voltage operational feedback submodule and selection control switch submodule respectively；
When the load switch control module output current conductivity control signal, the current operator feedback submodule warp
The selection control switch submodule provides current closed-loop negative-feedback signal, the current switch mould to the switch power module
Block is in the conduction state, and the switch power module exports constant current；
When the load switch control module output current turns off control signal, the voltage operational feedback submodule warp
The selection control switch submodule provides voltage close loop negative-feedback signal, the current switch mould to the switch power module
Block is off state, and the switch power module exports constant voltage.
Another embodiment according to the present utility model, the voltage operational feedback submodule include：
Voltage measurement unit is connect with the switch power module, for measuring the real-time work of the switch power module
Make voltage value；
Voltage sample and holding unit are set between the voltage measurement unit and the voltage error arithmetic element,
For the control signal adjustment operating mode exported according to the load switch control module and to the voltage error operation list
First output voltage sampled value/voltage retention value；
Voltage error arithmetic element is connect respectively with the voltage measurement unit and the voltage sample with holding unit,
It is surveyed for the voltage sample value/voltage retention value and the voltage measurement unit of the voltage sample and holding unit output
The real-time working voltage of amount is worth to voltage close loop negative-feedback signal, and is sent to the switch power module.
Another embodiment according to the present utility model, the voltage sample include with holding unit：
Signal receiving subelement is controlled, for receiving the control signal of the load switch control module output；
Control process subelement, for controlling sampling subelement according to the control signal of reception and keeping subelement
Work；
Subelement is sampled, the real-time working voltage for sampling the output of the voltage measurement unit is worth to described
Voltage sample value；
Subelement is kept, the voltage retention value is worth to for the voltage sample according to previous stage；
Subelement is exported, for exporting the voltage sample value/voltage retention value to the voltage error arithmetic element.
When the control signal controls signal for the current lead-through, the voltage sample is in sampling with holding unit
Pattern；When the control signal controls signal for the switch off current, the voltage sample is in holding unit and keeps mould
Formula.
Another embodiment according to the present utility model, the voltage sample and holding unit include ADC analog-digital converters,
DAC digital analog converters and logic controller, the ADC analog-digital converters connect the voltage measurement unit, the DAC digital-to-analogues
Converter connects the voltage error arithmetic element and the ADC analog-digital converters, the input terminal of the logic controller respectively
The load switch control signaling module is connected, output terminal connects the ADC analog-digital converters and DAC digital analog converters respectively,
When the control signal controls signal for the current lead-through, the logic controller controls the ADC moduluses
Converter works, and the real-time working voltage that the ADC analog-digital converters acquisition voltage measurement unit exports is worth to described
Voltage sample value；
When the control signal controls signal for the switch off current, the logic controller controls the DAC digital-to-analogues
Converter works, and DAC digital analog converters voltage sample according to previous stage is worth to the voltage retention value.
Another embodiment according to the present utility model, the voltage sample include analog switch, energy storage with holding unit
Capacitor and output stage driver, the input terminal of the analog switch connect the voltage measurement unit and the load respectively
Switch control signal module, the output terminal of the analog switch drive respectively with the energy-storage capacitor and the output stage
Device, the energy-storage capacitor are connect with the output stage driver, and the output stage driver connects the voltage error operation
Unit,
When the control signal controls signal for the current lead-through, the analog switch controls the energy-storage capacitor
The real-time working voltage for recording voltage measurement unit input is worth to voltage sample value, and the output stage driver is to described
Energy-storage capacitor charges；
When the control signal controls signal for the switch off current, the analog switch controls the energy-storage capacitor
The voltage sample according to previous stage is worth to the voltage retention value, and the output stage driver prevents the storage capacitor
Device discharges.
Another embodiment according to the present utility model, the voltage error arithmetic element include：
Receiving subelement, for receiving the voltage sample and voltage sample value/voltage retention value of holding unit output
The real-time working voltage value measured with the voltage measurement unit；
Comparing subunit is worth to for the voltage sample value/voltage retention value and the real-time working voltage
The voltage close loop negative-feedback signal；
Transmission sub-unit, for sending the voltage close loop negative-feedback signal to the switch power module.
Another embodiment according to the present utility model, the current operator feedback submodule include：
Current measuring unit is connected in series with the load blocks, is adopted for sampling the acquisition of the electric current of the load blocks
Sample voltage value；
Current reference value cell, for providing preset reference voltage value；
Current error arithmetic element, respectively with the current measuring unit, the current reference value cell and the choosing
Control switch submodule connection is selected, current closed-loop negative-feedback is worth to for the sample voltage value and the reference voltage
Signal, and it is sent to the switch power module.
Another embodiment according to the present utility model, the current switch module are field-effect tube or triode.
The utility model has the advantages that：
The electronic device for current source control of the utility model includes switch power module, current switch module, bears
Module, load switch control module and close loop negative feedback control module are carried, close loop negative feedback control module is according to load switch
Control module exports control signal feedback closed loop negative-feedback signal to switch power module, so as to which switch power module be controlled to exist
Switch between constant current output pattern and constant pressure output mode, specifically when load switch control module output current conducting control letter
Number when, control switch power module output constant current, when load switch control module output current turn off control signal when, control
Switch power module processed exports constant voltage.
The electronic device construction for current source control of the utility model is simple, and close loop negative feedback control module is according to negative
Load switch control module exports control signal feedback closed loop negative-feedback signal to switch power module, and switch power module is negative
Switch between two kinds of operating modes rather than single operating mode under the control of load switch control signal, can adapt to bear
The dynamic change of the load and closed loop feedback signal of switch power module is effective always so that switch power module always works in bright
Under true slave mode, be conducive to the switching of the high-speed switch of load, therefore, it is possible to realize that load current is quick and steadily opens
It closes.
Description of the drawings
Fig. 1 is the structure diagram of the one embodiment for the electronic device for being currently used for current source control；
Fig. 2 is the structure diagram of second embodiment of the electronic device for being currently used for current source control；
Fig. 3 is the structural frames of the first embodiment of the electronic device for current source control of the utility model；
Fig. 4 is the structural frames of the second embodiment of the electronic device for current source control of the utility model；
Fig. 5 is the structural frames of the 3rd embodiment of the electronic device for current source control of the utility model；
Fig. 6 is the voltage sample of the electronic device for current source control of the utility model and the first reality of holding unit
Apply a structure diagram；
Fig. 7 is the voltage sample of the electronic device for current source control of the utility model and the second reality of holding unit
Apply a structure diagram；
Fig. 8 is the voltage sample of the electronic device for current source control of the utility model and the third reality of holding unit
Apply a structure diagram；
Fig. 9 is an implementation of the voltage error arithmetic element of the electronic device for current source control of the utility model
Example structure diagram；
Figure 10 is the switching characteristic curve graph that current source controls electronic device：Figure 10 a control electronics dress for existing current source
Put the switching characteristic curve graph of first embodiment；Figure 10 b are that existing current source controls the switch of electronic device second embodiment special
Linearity curve figure；Figure 10 c are that the current source of the utility model controls the switching characteristic curve graph of electronic device.
Specific embodiment
In order to make the technical problems, technical solutions and advantages to be solved by the utility model clearer, below in conjunction with attached drawing
And specific embodiment is described in detail.
On the one hand, as shown in figure 3, the utility model embodiment provides a kind of electronic device for current source control,
It connect including sequentially connected switch power module 10, current switch module 20, load blocks 30 and with current switch module
Load switch control module 40, further include close loop negative feedback control module 50, close loop negative feedback control module connects out respectively
Powered-down source module and load switch control module, for when load switch control module output current turns off control signal, controlling
Switch power module processed exports constant current, when load switch control module output current turns off control signal, control switch
Power module exports constant voltage.
The electronic device for current source control of the utility model embodiment includes switch power module, current switch mould
Block, load blocks, load switch control module and close loop negative feedback control module, close loop negative feedback control module is according to load
Switch control module exports control signal feedback closed loop negative-feedback signal to switch power module, so as to control Switching Power Supply mould
Block switches between constant current output pattern and constant pressure output mode, specifically when the conducting control of load switch control module output current
During signal processed, control switch power module output constant current, when load switch control module output current turns off control signal
When, control switch power module output constant voltage.The electronic device knot for current source control of the utility model embodiment
Structure is simple, and close loop negative feedback control module controls signal feedback closed loop negative-feedback signal according to the output of load switch control module
To switch power module, switch power module switches under the control of load switch control signal between two kinds of operating modes,
Rather than single operating mode, it can adapt to the dynamic change of load and the closed loop feedback signal of switch power module have always
Effect so that switch power module is always worked under specific slave mode, is conducive to the switching of the high-speed switch of load, because
This, can realize that load current is quick and steadily switchs.
One as above-described embodiment is for example, as shown in figure 4, the close loop negative feedback control of the utility model embodiment
Molding block 50 includes current operator feedback submodule 51, voltage operational feedback submodule 52 and selection control switch submodule 53,
Current operator feeds back submodule connecting valve power module and selection control switch submodule, voltage operational feedback submodule setting
Between switch power module and selection control switch submodule, selection control switch submodule connecting valve power module is born
Load switch control module connects voltage operational feedback submodule and selection control switch submodule respectively；
When load switch control module output current conductivity control signal, the current operator feedback chosen control of submodule
It switchs submodule and provides current closed-loop negative-feedback signal to switch power module, current switch module is in the conduction state, switch
Power module exports constant current；
When load switch control module output current turns off control signal, the voltage operational feedback chosen control of submodule
It switchs submodule and provides voltage close loop negative-feedback signal to switch power module, current switch module is off state, switchs
Power module exports constant voltage.
It is anti-that the close loop negative feedback control module of the utility model embodiment includes current operator feedback submodule, voltage operational
Present submodule and selection control switch submodule, when load switch control module output current conductivity control signal, selection control
Current operator feedback submodule is connected to switch power module by system switch submodule, and is provided electric current to switch power module and closed
Ring negative-feedback signal, current switch module is in the conduction state at this time, switch power module output constant current；Work as load switch
During control module output current shutdown control signal, voltage operational feedback submodule is connected to out by selection control switch submodule
Powered-down source module, and voltage close loop negative-feedback signal is provided to switch power module, current switch module is off state, opens
Powered-down source module exports constant voltage.The close loop negative feedback control module of the utility model embodiment is simple in structure, passes through selection
Control signal behavior control negative voltage feedback/electric current that control switch submodule is exported according to load switch control module is born instead
Feedback, switches so as to fulfill switch power module between two kinds of operating modes, can adapt to the dynamic change of load and so that opens
Powered-down source module is always worked under specific slave mode, is conducive to the switching of the high-speed switch of load, therefore can be realized
Load current is quick and steadily switchs.
As above-described embodiment another for example, as shown in figure 5, the voltage operational of the utility model embodiment is anti-
Feedback submodule 52 includes：
Voltage measurement unit 521, connect with switch power module, for measuring the real-time working voltage of switch power module
Value；
Voltage sample and holding unit 522, are set between voltage measurement unit and voltage error arithmetic element, for root
Operating mode is adjusted according to the control signal of load switch control module output and is sampled to voltage error arithmetic element output voltage
Value/voltage retention value；
Voltage error arithmetic element 523, connect respectively with voltage measurement unit and voltage sample with holding unit, for than
The real-time working electricity measured compared with the voltage sample value/voltage retention value and voltage measurement unit of voltage sample and holding unit output
Pressure is worth to voltage close loop negative-feedback signal, and be sent to switch power module.
The voltage operational feedback submodule of the utility model embodiment includes voltage measurement unit, voltage sample with keeping single
Member and voltage error arithmetic element, it is simple in structure.The voltage operational feedback submodule of the utility model embodiment is switching
Power module is operated in sampling configuration, voltage sample and holding unit sampling switch power module when being operated in constant current output pattern
Actual output voltage, holding pattern is operated in when switch power module is operated in constant pressure output mode, to Switching Power Supply mould
Block provides the close loop negative feedback signal for keeping voltage.
As above-described embodiment another for example, as shown in fig. 6, the voltage sample of the utility model embodiment with
Holding unit 522 includes：
Signal receiving subelement 5221 is controlled, for receiving the control signal of load switch control module output；
Control process subelement 5222 for the control signal control sampling subelement according to reception and keeps subelement
Work；
Subelement 5223 is sampled, the real-time working voltage for the output of sampled voltage measuring unit is worth to voltage sample
Value；
Subelement 5224 is kept, voltage retention value is worth to for the voltage sample according to previous stage；
Subelement 5225 is exported, for voltage error arithmetic element output voltage sampled value/voltage retention value.
When signal is controlled to control signal for current lead-through, voltage sample is in sampling configuration with holding unit；Work as control
When signal controls signal for switch off current, voltage sample is in holding pattern with holding unit.
The voltage sample of the utility model embodiment includes control signal receiving subelement, control process with holding unit
Unit, sampling subelement keep subelement and output subelement, simple in structure, according to the load switch control module of reception
The control letter signal control sampling subelement of output and the work for keeping subelement so that voltage sample is in not with holding unit
Same operating mode, when signal is controlled to control signal for current lead-through, voltage sample is in sampling configuration with holding unit；Work as control
When signal processed controls signal for switch off current, voltage sample is in holding pattern with holding unit.
As above-described embodiment another for example, as shown in fig. 7, the voltage sample of the utility model embodiment with
Holding unit includes ADC analog-digital converters 5221 ', DAC digital analog converters 5222 ' and logic controller 5223 ', ADC moduluses
Converter connects voltage measurement unit 521 ', and DAC digital analog converters connect voltage error arithmetic element 523 ' and ADC moduluses respectively
Converter, the input terminal connection load switch control signaling module 40 ' of logic controller, output terminal connect ADC moduluses and turn respectively
Parallel operation and DAC digital analog converters,
When signal is controlled to control signal for current lead-through, logic controller control ADC analog-digital converter work, ADC moulds
The real-time working voltage of number converter collection voltages measuring unit output is worth to voltage sample value；
When signal is controlled to control signal for switch off current, logic controller control DAC digital analog converter work, DAC numbers
Mode converter is worth to voltage retention value according to previous stage voltage sample.
The voltage sample of the utility model embodiment and holding unit include ADC analog-digital converters, DAC digital analog converters with
And logic controller, switch power module and load blocks it is separated when, keep the output voltage of switch power module not
Become, specifically include：When being connected between switch power module and load blocks switch power module is acquired with ADC analog-digital converters
The operating voltage measured value of output, switch power module and load blocks it is separated when, with DAC digital analog converters continue by
The operating voltage measured value of previous stage expresses the input terminal in voltage error arithmetic element, at the same time, by Switching Power Supply mould
The source of the closed loop feedback signal of block is switched to the output of voltage error arithmetic element, that is, is switched to voltage close loop negative-feedback letter
Number.
As above-described embodiment another for example, as shown in figure 8, the voltage sample of the utility model embodiment with
Holding unit includes analog switch 5221 ", energy-storage capacitor 5223 " and output stage driver 5222 ", the input of analog switch
Connection voltage measurement unit 521 " and load switch control signaling module 40 " respectively at end, the output terminal of analog switch respectively with storage
Energy capacitor and output stage driver, energy-storage capacitor are connect with output stage driver, and output stage driver connection voltage misses
Difference operation unit 523 ",
When signal is controlled to control signal for current lead-through, analog switch control energy-storage capacitor recording voltage measuring unit
The real-time working voltage of input is worth to voltage sample value, and output stage driver charges to energy-storage capacitor；
When signal is controlled to control signal for switch off current, analog switch controls energy-storage capacitor according to previous stage voltage
Sampling is worth to voltage retention value, and output stage driver prevents energy-storage capacitor from discharging.
The voltage sample of the utility model embodiment includes analog switch, energy-storage capacitor and output stage with holding unit
Driver, switch power module and load blocks it is separated when, the output voltage for keeping switch power module is constant, specifically
Including：Between switch power module and load blocks be connected when allow energy-storage capacitor store electric energy, switch power module with
Load blocks it is separated when, by the expression of the voltage of energy-storage capacitor voltage error arithmetic element input terminal, at the same time,
The source of the closed loop feedback signal of switch power module is switched to the output of voltage error arithmetic element, that is, is switched to voltage and closes
Ring negative-feedback signal.
As above-described embodiment another for example, as shown in figure 9, the utility model embodiment voltage error fortune
Unit 523 is calculated to include：
Receiving subelement 5231, for voltage sample value/voltage retention value of receiving voltage sampling and holding unit output
The real-time working voltage value measured with voltage measurement unit；
Comparing subunit 5232 is worth to voltage for comparison voltage sampled value/voltage retention value and real-time working voltage
Close loop negative feedback signal；
Transmission sub-unit 5233, for sending voltage close loop negative-feedback signal to switch power module.
As above-described embodiment another for example, as shown in figure 5, the current operator of the utility model embodiment is anti-
Feedback submodule 51 includes：
Current measuring unit 511, is connected in series with load blocks, and sampled voltage is obtained for sampling the electric current of load blocks
Value；
Current reference value cell 512, for providing preset reference voltage value；
Current error arithmetic element 513 switchs respectively with current measuring unit, current reference value cell and selection control
Submodule connects, and current closed-loop negative-feedback signal is worth to, and be sent to switch for comparing sample voltage value and reference voltage
Power module.
The utility model embodiment current operator feedback submodule include current measuring unit, current reference value cell and
Current error arithmetic element provides Current Negative Three-Point Capacitance letter when being connected between switch power module and load blocks to switch module
Number, sample voltage value is obtained by the electric current of power measurement unit real-time sampling load blocks, passes through current error operation list
Member relatively sample voltage value and reference voltage are worth to current closed-loop negative-feedback signal and are sent to switch power module so that open
Powered-down source module adjustment output voltage keeps constant current output.
As above-described embodiment another for example, the utility model embodiment current switch module be field-effect
Pipe or triode.
The above is the preferred embodiment of the utility model, it is noted that for the ordinary skill of the art
For personnel, under the premise of principle described in the utility model is not departed from, several improvements and modifications can also be made, these improvement
The scope of protection of the utility model is also should be regarded as with retouching.
Claims (9)
1. a kind of electronic device for current source control including sequentially connected switch power module, current switch module, is born
Carry module and the load switch control module being connect with current switch module, which is characterized in that further include close loop negative feedback control
Molding block, the close loop negative feedback control module connect the switch power module and the load switch control module respectively,
For when the load switch control module output current conductivity control signal, controlling the switch power module output constant
Electric current when the load switch control module output current turns off control signal, controls the switch power module output permanent
Constant voltage.
2. a kind of electronic device for current source control according to claim 1, which is characterized in that the closed loop is born instead
It presents control module and includes current operator feedback submodule, voltage operational feedback submodule and selection control switch submodule, it is described
Current operator feedback submodule connects the switch power module and the selection control switch submodule, and the voltage operational is anti-
Feedback submodule is set between the switch power module and the selection control switch submodule, selection control switch
Module connects the switch power module, the load switch control module connect respectively the voltage operational feedback submodule and
Selection control switch submodule；
When the load switch control module output current conductivity control signal, described in the current operator feedback submodule warp
Selection control switch submodule provides current closed-loop negative-feedback signal to the switch power module, at the current switch module
In conducting state, the switch power module exports constant current；
When the load switch control module output current turns off control signal, described in the voltage operational feedback submodule warp
Selection control switch submodule provides voltage close loop negative-feedback signal to the switch power module, at the current switch module
In off state, the switch power module exports constant voltage.
A kind of 3. electronic device for current source control according to claim 2, which is characterized in that the voltage operational
Feedback submodule includes：
Voltage measurement unit is connect with the switch power module, for measuring the real-time working of switch power module electricity
Pressure value；
Voltage sample and holding unit are set between the voltage measurement unit and the voltage error arithmetic element, are used for
It is according to the control signal adjustment operating mode of load switch control module output and defeated to the voltage error arithmetic element
Go out voltage sample value/voltage retention value；
Voltage error arithmetic element connect with holding unit with the voltage measurement unit and the voltage sample, is used for respectively
Compare voltage sample value/voltage retention value of the voltage sample and holding unit output and the voltage measurement unit measures
Real-time working voltage is worth to voltage close loop negative-feedback signal, and is sent to the switch power module.
A kind of 4. electronic device for current source control according to claim 3, which is characterized in that the voltage sample
Include with holding unit：
Signal receiving subelement is controlled, for receiving the control signal of the load switch control module output；
Control process subelement, for controlling sampling subelement according to the control signal of reception and keeping the work of subelement
Make；
Subelement is sampled, the real-time working voltage for sampling the output of the voltage measurement unit is worth to the voltage
Sampled value；
Subelement is kept, the voltage retention value is worth to for the voltage sample according to previous stage；
Subelement is exported, for exporting the voltage sample value/voltage retention value to the voltage error arithmetic element.
When the control signal controls signal for the current lead-through, the voltage sample is in sampling mould with holding unit
Formula；When the control signal controls signal for the switch off current, the voltage sample is in holding pattern with holding unit.
A kind of 5. electronic device for current source control according to claim 3 or 4, which is characterized in that the voltage
Sampling includes ADC analog-digital converters, DAC digital analog converters and logic controller, the ADC analog-digital converters with holding unit
The voltage measurement unit is connected, the DAC digital analog converters connect the voltage error arithmetic element and the ADC moulds respectively
Number converter, the input terminal of the logic controller connect the load switch control signaling module, and output terminal connects institute respectively
ADC analog-digital converters and DAC digital analog converters are stated,
When the control signal controls signal for the current lead-through, the logic controller controls the ADC analog-to-digital conversions
Device works, and the real-time working voltage that the ADC analog-digital converters acquire the voltage measurement unit output is worth to the voltage
Sampled value；
When the control signal controls signal for the switch off current, the logic controller controls the DAC digital-to-analogue conversions
Device works, and DAC digital analog converters voltage sample according to previous stage is worth to the voltage retention value.
A kind of 6. electronic device for current source control according to claim 3 or 4, which is characterized in that the voltage
Sampling includes analog switch, energy-storage capacitor and output stage driver, the input terminal point of the analog switch with holding unit
Do not connect the voltage measurement unit and load switch control signaling module, the output terminal of the analog switch respectively with institute
Energy-storage capacitor and the output stage driver are stated, the energy-storage capacitor is connect with the output stage driver, described defeated
Go out grade driver and connect the voltage error arithmetic element,
When the control signal controls signal for the current lead-through, the analog switch controls the energy-storage capacitor record
The real-time working voltage of voltage measurement unit input is worth to voltage sample value, and the output stage driver is to the energy storage
Capacitor charges；
When the control signal controls signal for the switch off current, the analog switch control the energy-storage capacitor according to
Voltage sample described in previous stage is worth to the voltage retention value, and the output stage driver prevents the energy-storage capacitor from putting
Electricity.
A kind of 7. electronic device for current source control according to claim 3 or 4, which is characterized in that the voltage
Error op unit includes：
Receiving subelement, for receiving voltage sample value/voltage retention value of the voltage sample and holding unit output and institute
State the real-time working voltage value of voltage measurement unit measurement；
Comparing subunit is worth to described for the voltage sample value/voltage retention value and the real-time working voltage
Voltage close loop negative-feedback signal；
Transmission sub-unit, for sending the voltage close loop negative-feedback signal to the switch power module.
8. according to a kind of any electronic devices controlled for current source of claim 2-4, which is characterized in that the electricity
Stream operation feedback submodule includes：
Current measuring unit is connected in series with the load blocks, and sampling electricity is obtained for sampling the electric current of the load blocks
Pressure value；
Current reference value cell, for providing preset reference voltage value；
Current error arithmetic element is controlled respectively with the current measuring unit, the current reference value cell and the selection
System switch submodule connection, current closed-loop negative-feedback letter is worth to for the sample voltage value and the reference voltage
Number, and it is sent to the switch power module.
9. according to a kind of any electronic devices controlled for current source of claim 1-4, which is characterized in that the electricity
It is field-effect tube or triode to flow switch module.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721359860.XU CN207586783U (en) | 2017-10-21 | 2017-10-21 | A kind of electronic device for current source control |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721359860.XU CN207586783U (en) | 2017-10-21 | 2017-10-21 | A kind of electronic device for current source control |
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| CN207586783U true CN207586783U (en) | 2018-07-06 |
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| CN201721359860.XU Withdrawn - After Issue CN207586783U (en) | 2017-10-21 | 2017-10-21 | A kind of electronic device for current source control |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108683416A (en) * | 2018-07-25 | 2018-10-19 | 上海艾为电子技术股份有限公司 | A kind of load switch control circuit |
| CN109696938A (en) * | 2017-10-21 | 2019-04-30 | 国神光电科技（上海）有限公司 | A kind of electronic device and control method for current source control |
-
2017
- 2017-10-21 CN CN201721359860.XU patent/CN207586783U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109696938A (en) * | 2017-10-21 | 2019-04-30 | 国神光电科技（上海）有限公司 | A kind of electronic device and control method for current source control |
| CN109696938B (en) * | 2017-10-21 | 2023-11-03 | 国神光电科技（上海）有限公司 | Electronic device for current source control and control method |
| CN108683416A (en) * | 2018-07-25 | 2018-10-19 | 上海艾为电子技术股份有限公司 | A kind of load switch control circuit |
| CN108683416B (en) * | 2018-07-25 | 2023-09-15 | 上海艾为电子技术股份有限公司 | Load switch control circuit |
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