CN107681464A - A kind of power circuit - Google Patents
A kind of power circuit Download PDFInfo
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- CN107681464A CN107681464A CN201710781076.6A CN201710781076A CN107681464A CN 107681464 A CN107681464 A CN 107681464A CN 201710781076 A CN201710781076 A CN 201710781076A CN 107681464 A CN107681464 A CN 107681464A
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- voltage
- modular converters
- sample module
- input
- current
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/04—Processes or apparatus for excitation, e.g. pumping, e.g. by electron beams
- H01S5/042—Electrical excitation ; Circuits therefor
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- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Optics & Photonics (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention discloses a kind of power circuit, including：DC DC modular converters, voltage sample module, current sample module and MCU control module, voltage sample module and current sample module are connected to the feedback input end of DC DC modular converters, and MCU control module is connected with voltage sample module and current sample module；Input power is converted to default constant voltage constant current power by DC DC modular converters；Voltage sample module simulation samples the output voltage signal of DC DC modular converters, and the isolation of analog sampling value is fed back into DC DC modular converters；Current sample module simulation samples the output current signal of DC DC modular converters, isolates after analog sampling value is amplified and feeds back to DC DC modular converters；MCU control module, for changing the sampled value of voltage sample module or the output of current sample module, to adjust the voltage or electric current steady state value of the output of DC DC modular converters, there is provided a kind of adjustable constant-voltage constant.
Description
Technical field
The present invention relates to technical field of circuit design, more particularly to a kind of power circuit.
Background technology
Laser scanning type projecting apparatus has that caloric value is small, the high advantage of energy conversion rate, is projected compared to digital micromirror elements
For instrument, it can effectively solve the problem that projecting apparatus scalds problem excessively existing for using for a long time.Laser driver need of work-adjustable
Constant voltage constant current power, because the brightness of laser diode can be adjusted according to on-the-spot test environment, brightness etc. in production line test, this
Adjustable range is larger, and required constant current is from hundreds of milliamperes to several amperes, however, in existing constant-current supply, constant-current transistor
Source and FET-constant current source are easily affected by temperature, output current deficiency, and voltage can not be constant adjustable, integrated operational amplifier constant current source
Although output current is not affected by temperature, when electric current adjusts on a large scale, conversion efficiency is low, therefore, it is necessary to designs a kind of conversion
The power supply that efficiency high, driving force are strong, outputting current steadily and feedback speed are fast.
The content of the invention
In view of the problem of prior art laser diode drive power supply can not meet to require, it is proposed that one kind of the invention
Power circuit, to overcome above mentioned problem or to solve the above problems at least in part.
To achieve these goals, present invention employs following technical scheme：
A kind of power circuit, the circuit include：DC-DC modular converters, voltage sample module, current sample module and MCU
The feedback that control module, the voltage sample module and the current sample module are connected to the DC-DC modular converters is defeated
Enter end, the MCU control module is connected with the voltage sample module and the current sample module；
The DC-DC modular converters, for input power to be converted into default constant voltage constant current power, export makes to load
With；
The voltage sample module, for the output voltage signal of DC-DC modular converters described in analog sampling, simulation is adopted
Feedback input end of the sample value isolation and amplifier to the DC-DC modular converters；
The current sample module, for the output current signal of DC-DC modular converters described in analog sampling, simulation is adopted
Feedback input end of the isolation and amplifier to the DC-DC modular converters after sample value amplification；
The MCU control module, for changing the sampling of the voltage sample module or current sample module output
Value, to adjust the voltage or electric current of the DC-DC modular converters output.
Alternatively, the voltage sample module includes the first sampling resistor, the first digital regulation resistance, the first operation amplifier
Device, the first diode, the first feedback resistance and the first feedback capacity；
One end of first sampling resistor connects the out-put supply of the DC-DC modular converters, described in other end connection
One fixing end of the first digital regulation resistance and the in-phase input end of first operational amplifier, first digital regulation resistance
Sliding end ground connection, the inverting input of first operational amplifier is connected with output end, the positive pole of first diode
Connecting the output end of first operational amplifier, negative pole connects the feedback input end of the DC-DC modular converters, and described first
Feedback resistance and first feedback capacity are connected in parallel between the feedback input end and ground of the DC-DC modular converters；
First digital regulation resistance is connected with the MCU control module, and the MCU control module is by changing described
The resistance of one digital regulation resistance changes the sampled value of the voltage sample module output.
Alternatively, the voltage sample module also includes the first electric capacity, one end connection described first of first electric capacity
The fixing end that digital regulation resistance is connected with the first sampling resistor, the other end ground connection of first electric capacity.
Alternatively, the current sample module includes：Second sampling resistor, the second digital regulation resistance, in-phase amplifier,
Two operational amplifiers, the second diode, the second feedback resistance and the second feedback capacity；
Second sampling resistor is connected in the out-put supply negative line of the DC-DC modular converters, its one end ground connection,
The other end connects the input of the in-phase amplifier, and the output end of the in-phase amplifier connects second digital regulation resistance
A fixing end, second digital regulation resistance another fixing end ground connection, second operational amplifier it is same mutually defeated
Enter the sliding end that end connects second digital regulation resistance, inverting input and the output end of second operational amplifier connect
Connect, the positive pole of second diode connects the output end of second operational amplifier, and negative pole connects the DC-DC moduluss of conversion
The feedback input end of block, second feedback resistance and second feedback capacity are connected in the DC-DC modular converters in parallel
Feedback input end and ground between；
Second digital regulation resistance is connected with the MCU control module, and the MCU control module is by changing described
The resistance of two digital regulation resistances changes the sampled value of the current sample module output.
Alternatively, the current sample module also includes the second electric capacity, one end connection described second of second electric capacity
The sliding end of digital regulation resistance, the other end ground connection of second electric capacity.
Alternatively, the power circuit also includes power module, for providing work for the first or second operational amplifier
Power supply, the power module include：LDO chips and some filter capacitors；
The input of the LDO chips is connected with the input power, output end and the first or second operational amplifier
Power end is connected, and earth terminal ground connection, the input and output end of the LDO chips are grounded by some filter capacitors.
Alternatively, the power module also includes pressure unit, and the pressure unit includes triode, first resistor, the
Three electric capacity and the first voltage-regulator diode；
The colelctor electrode of the triode connects the input power, and colelctor electrode is connected with base stage by the 3rd resistor,
3rd electric capacity and first voltage-regulator diode are connected in parallel between the transistor base and ground, first voltage stabilizing
The negative pole of diode connects the transistor base, plus earth, and the emitter stage of the triode connects the defeated of the LDO chips
Enter end.
Alternatively, the power module also includes power supply instruction unit, the power supply instruction unit include current-limiting resistance and
Light emitting diode, one end of the current-limiting resistance connect the output end of the LDO chips, and the other end connects the light emitting diode
Positive pole, the light emitting diode negative pole ground connection.
Alternatively, the DC-DC modular converters include：DC-DC conversion chips, inductance, the second voltage-regulator diode and some
Filter capacitor；
The inputs of the DC-DC conversion chips connects the input power, output end connect the inductance one end and
The negative pole of second voltage-regulator diode, the other end of the inductance connects as out-put supply positive pole to be loaded, and described second is steady
Press diode plus earth, if the input of the DC-DC conversion chips and the inductance connection load one end by
Dry filter capacitor ground connection.
Alternatively, the power circuit also includes resettable fuse, and the resettable fuse is connected on the input
On the transmission line of power supply.
In summary, the beneficial effects of the present invention are：
Using DC-DC modular converters, and by voltage sample module and current sample module simulation sampling and outputting voltage and
Output current, the feedback input end that sampled analog value isolation is fed back to DC-DC modular converters are defeated with constant DC-DC modular converters
The voltage or electric current gone out, power supply conversion efficiency is high, and output current scope is big, and signal feedback speed is fast, and isolation feedback reduces
Influence of the feedback input end to sampled value, improves the stability of output voltage and electric current, while increases MCU control module, just
Connected in expanding, realize the voltage x current that out-put supply is controlled using host computer etc..
Brief description of the drawings
Fig. 1 is a kind of power circuit composition frame chart that one embodiment of the invention provides；
Fig. 2 is that a kind of power circuit that one embodiment of the invention provides does not include digital regulation resistance and MCU control module
Circuit connection diagram；
Fig. 3 is the digital regulation resistance of embodiment illustrated in fig. 2 and the circuit connection diagram of MCU control module.
Embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing to embodiment party of the present invention
Formula is described in further detail.
The present invention technical concept be：Using DC-DC modular converters so that input power is converted into constant voltage constant current power, and
Isolate instead by voltage sample module and current sample module simulation sampling and outputting voltage and output current, and by analog sampling value
The feedback input end of DC-DC modular converters is fed to constant voltage and electric current, the power supply conversion efficiency of circuit is high, output current model
Enclose greatly, and signal feedback speed is fast, and analog sampling value is fed back to the feedback input end of DC-DC modular converters after isolation,
Influence of the feedback input end to sampling module sampled value is also reduced, improves the stability of output voltage and electric current, while this
Circuit also add MCU control module, be easy to expand connection, realization easily accurately controls output using host computer digital device
The voltage x current of power supply.
Fig. 1 is a kind of power circuit composition frame chart that one embodiment of the invention provides, as shown in figure 1, a kind of power supply is electric
Road, the power circuit include：DC-DC modular converters 110, voltage sample module 120, current sample module 130 and MCU control moulds
Block 140, voltage sample module 120 and current sample module 130 are connected to the feedback input end of DC-DC modular converters 110,
MCU control module 140 is connected with voltage sample module 120 and current sample module 130.
DC-DC modular converters 110, for input power to be converted into default constant voltage constant current power, export makes to load
With, the load can be laser diode, it is of course also possible to be that other need the load of constant voltage constant current power, it is no longer superfluous herein
State.
Voltage sample module 120, for the output voltage signal of analog sampling DC-DC modular converters 110, by analog sampling
It is worth isolation and amplifier to the feedback input end of DC-DC modular converters 110, to adjust the output voltage of DC-DC modular converters 110.
Current sample module 130, for the output current signal of analog sampling DC-DC modular converters 110, by analog sampling
For isolation and amplifier to the feedback input end of DC-DC modular converters 110, the output for adjusting DC-DC modular converters 110 is electric after value amplification
Stream.
MCU control module 140, the sampled value exported for changing voltage sample module 120 or current sample module 130,
To adjust the voltage or electric current steady state value of the output of DC-DC modular converters 110.
By the voltage of voltage sample module 120 and the analog sampling DC-DC modular converters 110 of current sample module 130 and
Current signal, and obtained analog sampling value is fed back into DC-DC modular converters 110 through isolation, it is not necessary to by analog quantity and
The conversion of digital quantity, and isolate feedback and also reduce influence of the feedback input end resistance to sample circuit so that voltage x current is adopted
Sample is more accurate, so as to provide the stability of the output supply voltage of DC-DC modular converters 110 and electric current, meanwhile, pass through increase
MCU control module, can be with the convenient expansion for realizing circuit, so as to connect by interfaces such as USB, RS232 of MCU control module
The digitizers such as host computer accurately, conveniently adjust the voltage and circuit steady state value of the out-put supply of DC-DC modular converters 110.
Fig. 2 and Fig. 3 is a kind of circuit connection diagram for power circuit that one embodiment of the invention provides, in figure, DC-
DC modular converters 110 include：DC-DC conversion chips U5, inductance L1, the second voltage-regulator diode D5 and some filter capacitors.
DC-DC conversion chips U5 input Vin connection input powers, specifically in fig. 2, Vin ends are connected to power supply company
Device J1 1 pin, U5 output end SW connection inductance L1 one end and the second voltage-regulator diode D5 negative pole are connect, inductance L1's is another
End specifically in fig. 2, is connected to coad connector J2 1 pin, the second voltage-regulator diode as the connection load of out-put supply positive pole
D5 plus earth, DC-DC conversion chips U5 input is grounded by filter capacitor C13 and C14 to be filtered, and passes through filter capacitor
C12 is connected to the filtering of VC ends, and one end of inductance L1 connections load is grounded by filter capacitor C15 and C16 to be filtered.Wherein, DC-DC turns
It is XL4015 voltage-dropping type conversion chips to change chip U5, and energy conversion efficiency is high, it is possible to provide high current.
Voltage sample module 120 include the first sampling resistor R7, the first digital regulation resistance R1 ', the first operational amplifier U2,
First diode D1, the first feedback resistance R5 and the first feedback capacity C9.
The out-put supply of first sampling resistor R7 one end connection DC-DC modular converters 110, the numeral of other end connection first
A potentiometer R1 ' fixing end and the first operational amplifier U2 in-phase input end, the first digital regulation resistance U2 sliding end
Ground connection (embodiment illustrated in fig. 2, fixing end below the first digital regulation resistance R1 ' and sliding end connect together use), the first fortune
The inverting input for calculating amplifier U2 is connected with output end, therefore the first operational amplifier U2 forms a voltage follower, is led to
Cross impedance conversion, reduce feedback input end resistance R5 to R7 and R1 ' composition sample circuit influence, realize to analog sampling value
Isolation and amplifier, the first diode D1 positive pole connects the first operational amplifier U2 output end, and D1 negative pole connection DC-DC turns
The feedback input end of block 110 is changed the mold, i.e. chip U5 FB ends, the first feedback resistance R5 and the first feedback capacity C9 is connected in parallel
Between the feedback input end and ground of DC-DC modular converters 110.
First digital regulation resistance R1 ' is connected with MCU control module 140, and MCU control module 140 is by changing the first numeral
Potentiometer R1 ' resistance changes the sampled value of the output of voltage sample module 120, to adjust DC-DC conversion chip U5 out-put supplies
Voltage constant value.Specifically, the second digital regulation resistance R1 ' clock pins SCLK_Voltage, strobe pin SYNC_
Voltage and data pin DIN_Voltage connects an input and output pin of MCU control module 140 respectively.
The also one end including the first electric capacity C17, the first electric capacity C17 of voltage sample module 120 connects the first digital regulation resistance
The fixing end that R1 ' is connected with the first sampling resistor R7, the first electric capacity C17 other end ground connection.Electric capacity C17 is low capacity electricity
Hold, with filter out the first digital regulation resistance R1 ' slide caused by high-frequency noise, improve the stability of output voltage.
Current sample module 130 includes：Second sampling resistor R8, the second digital regulation resistance R2 ', in-phase amplifier, second
Operational amplifier U3, the second diode D4, the second feedback resistance R5 and the second feedback capacity C9, i.e.,：Real shown in Fig. 2 and Fig. 3
Apply in example, voltage sample module 120 and current sample module 130 share feedback resistance R5 and feedback capacity C9.
Second sampling resistor R8 is connected in the out-put supply negative line of DC-DC modular converters 110, specifically shown in Fig. 2
In circuit, R8 is connected between coad connector J2 2 pin and ground, and R8 connections J2 one end is additionally coupled to the defeated of in-phase amplifier
Enter end, the in-phase amplifier is made up of resistance R3, R4, R6 and electric capacity C8, C11 of operational amplifier U4 and its periphery, same mutually to put
The output end of big device connects a second digital regulation resistance R2 ' fixing end, the second digital regulation resistance R2 ' another fixing end
Ground connection, the second operational amplifier U3 in-phase input end connect the second digital regulation resistance R2 ' sliding end, the second operational amplifier
U3 inverting input is connected with output end, forms a voltage follower, to realize the isolation and amplifier to analog sampling value, the
Two diode D4 positive pole connects the second operational amplifier U3 output end, and the feedback of negative pole connection DC-DC modular converters 110 is defeated
Enter and hold FB, the second feedback resistance R5 and the second feedback capacity C9 be connected in parallel the feedback input ends of DC-DC modular converters 110 with
Between ground.
Second digital regulation resistance R2 ' is connected with MCU control module 140, and MCU control module 140 is by changing the second numeral
Potentiometer R2 ' resistance changes the sampled value of the output of current sample module 130, to adjust DC-DC conversion chip U5 out-put supplies
Electric current steady state value.Specifically, the second digital regulation resistance R1 ' clock pins SCLK_Current, strobe pin SYNC_
Current and data pin DIN_Current connects an input and output pin of MCU control module 140 respectively.
The also one end including the second electric capacity C10, the second electric capacity C10 of current sample module 130 connects the second digital regulation resistance
R2 ' sliding end, the second electric capacity C10 other end ground connection.Second electric capacity C10 is also low capacity electric capacity, to filter out the second numeral
High-frequency noise caused by potentiometer R2 ' slips, improve the stability of R2 ' output sampled values.
Wherein, the specific connected mode of in-phase amplifier is：Resistance R4 one end concatenation operation amplifier U4's is same mutually defeated
Enter end, the input of the resistance R4 other end as in-phase amplifier, resistance R3 one end ground connection, other end concatenation operation amplifies
Device U4 inverting input and resistance R6 one end, the R6 other end concatenation operation amplifiers U4 of resistance output end, and computing
Also connected by frequency compensation capacitance C11 between the inverting input and output end of amplifier, improved together with introducing phase compensation
The amplitude-frequency and phase-frequency characteristic of phase amplifier.The multiplication factor of the in-phase amplifier is higher, can reduce system to sampling resistor R8 work(
The requirement of consumption and volume, while improve system output current control range.
According to the circuit connection diagram shown in Fig. 2 and Fig. 3, the operation principle for introducing this power circuit is as follows：
Resistance R7 and digital regulation resistance R1 ' forms the voltage sampling circuit in parallel with load, digital regulation resistance R1 ' both sides
Voltage passes through the voltage follower isolation and amplifier that operational amplifier U2 is formed to diode D1 positive poles as sampled analog value；Electricity
R8 and load in series sampled current signals are hindered, current signal are converted into voltage signal, the voltage signal is through operational amplifier U4
It is added in after the in-phase amplifier amplification of composition in digital regulation resistance R2 ' two fixing ends, digital regulation resistance R2 ' sliding end electricity
Pressure as the sampled analog value after partial pressure, the voltage follower isolation and amplifier formed by operational amplifier U3 to diode D4 just
Pole, diode D1, D4 feed back to the superposition of sampled signal that U2, U3 feed back chip U5 feedback input end FB, diode D1 and
D4 plays the effect for preventing from pouring in down a chimney, and the big person of voltage is worked to chip U5 FB ends in the signal that U2 and U3 feed back, so as to play
The effect of constant pressure and flow：As the sampled voltage signal V of U2 feedbacksu2When larger, the voltage on resistance R5 is (Vu2-VD1)(VD1For D1
On pressure drop), now U5 output supply voltage it is constant can be by changing the first digital regulation resistance in setting value, the steady state value
R1 ' resistance changes, and now U5 output current can be in the range of maximum output current with access load change.Similarly, if
The current sampling signal V of U3 feedbacksU3Larger, then the voltage on resistance R5 is (Vu3-VD4)(VD4For the pressure drop on D4), now U5
The source current of output is constant can be changed in setting value, the steady state value by changing the second digital regulation resistance R2 ' resistance, this
When U5 output voltage can in the range of maximum output voltage with access load change.
The power circuit also includes power module, for being provided for the first operational amplifier U2 or the second operational amplifier U3
Working power, power module include：LDO chips U1 and some filter capacitors.
LDO chips U1 input is connected with input power, i.e., is connected with connector J1 1 pin, output end and the first fortune
Amplifier U2 or the second operational amplifier U3 power end connection, U1 earth terminal ground connection are calculated, LDO chips U1 input passes through
Filter capacitor C3 ground connection filtering, U1 output end are grounded by filter capacitor C4 and C5.Certainly, the computing of in-phase amplifier is formed
Amplifier U4 can also use the power module to power.Preferably, in operational amplifier U2, U3 and U4 power end, also lead to respectively
Cross filter capacitor C1, C7 and C6 and carry out ground connection filtering, to improve the stability of operating voltage.
On the basis of above-described embodiment, power module also includes pressure unit, and pressure unit includes triode Q1, the first electricity
Hinder R1, the 3rd electric capacity C2 and the first voltage-regulator diode D2.
Triode Q1 colelctor electrode connection input power, colelctor electrode are connected with base stage by 3rd resistor R1, the 3rd electric capacity
C2 and the first voltage-regulator diode D2 are connected in parallel between triode Q1 base stage and ground, and the first voltage-regulator diode D2 negative pole connects
Connect triode Q1 base stage, D2 plus earth, triode Q1 emitter stage connection LDO chips U1 input.
The operation principle of the pressure unit is as follows：
Voltage-regulator diode D2 is operated in breakdown conditions, by triode Q1 base voltage clamper in preset voltage value, so that
Triode Q1 emitter stages export the voltage stabilization to U1 near preset voltage value, so as to the big ditty automatically according to input voltage
Triode Q1 colelctor electrodes are saved with launching the pressure drop of interpolar, the excessive heating of pressure drop on LDO chips U1 is avoided, reduces U1 power consumption.
Preferably, power module also includes power supply instruction unit, and power supply instruction unit includes current-limiting resistance R2 and luminous two
Pole pipe D3, current-limiting resistance R2 one end connection LDO chips U1 output end, other end connecting luminous diode D3 positive pole, hair
Optical diode D3 negative pole ground connection, by light emitting diode D3 light on and off come the whether upper electricity of indicating circuit.
As shown in Fig. 2 the power circuit also includes resettable fuse F1, resettable fuse F1 is connected on input power
Transmission line on, the self-protection when over-current phenomenon avoidance occurs in system, the self-recovery at the end of over-current phenomenon avoidance, electric conduction again
Road.
This power circuit uses DC-DC modular converters as core, and energy conversion efficiency is high, and chip caloric value is few, effectively anti-
Only power circuit overheats, wide input voltage range：DC8V~DC36V, output voltage range can be between DC1.25V~DC32V
Linear adjustable, highest output current is more than 3A, can meet the light intensity of high power laser diode linearly adjustable demand, this circuit
Changed in the absence of the digital quantity and analog quantity of complexity, circuit composition is simple, it is only necessary to resistance, electric capacity, inductance and operational amplifier
, also, be used in combination by operational amplifier and digital regulation resistance and form backfeed loop, feedback speed is fast, and isolates feedback
The stability of feedback signal is improved, further increases the constant performance of this power circuit out-put supply, by increasing MCU controls
Molding block, circuit expansion can be also conveniently realized, be connected with host computer etc., receive digital controlled signal, adjustment digital regulation resistance
Resistance, carry out the accurate voltage and current steady state value for controlling out-put supply.
The foregoing is only a specific embodiment of the invention, under the above-mentioned teaching of the present invention, those skilled in the art
Other improvement or deformation can be carried out on the basis of above-described embodiment.It will be understood by those skilled in the art that above-mentioned tool
The purpose of the present invention is simply preferably explained in body description, and protection scope of the present invention should be defined by scope of the claims.
Claims (10)
1. a kind of power circuit, it is characterised in that the power circuit includes：DC-DC modular converters, voltage sample module, electric current
Sampling module and MCU control module, the voltage sample module and the current sample module are connected to the DC-DC conversions
The feedback input end of module, the MCU control module are connected with the voltage sample module and the current sample module；
The DC-DC modular converters, for input power to be converted into default constant voltage constant current power, export and used to load；
The voltage sample module, for the output voltage signal of DC-DC modular converters described in analog sampling, by analog sampling value
Feedback input end of the isolation and amplifier to the DC-DC modular converters；
The current sample module, for the output current signal of DC-DC modular converters described in analog sampling, by analog sampling value
Feedback input end of the isolation and amplifier to the DC-DC modular converters after amplification；
The MCU control module, for changing the sampled value of the voltage sample module or current sample module output, with
Adjust the voltage or electric current of the DC-DC modular converters output.
2. power circuit as claimed in claim 1, it is characterised in that the voltage sample module include the first sampling resistor,
First digital regulation resistance, the first operational amplifier, the first diode, the first feedback resistance and the first feedback capacity；
One end of first sampling resistor connects the out-put supply of the DC-DC modular converters, other end connection described first
One fixing end of digital regulation resistance and the in-phase input end of first operational amplifier, the cunning of first digital regulation resistance
Moved end is grounded, and the inverting input of first operational amplifier is connected with output end, the positive pole connection of first diode
The output end of first operational amplifier, negative pole connect the feedback input end of the DC-DC modular converters, first feedback
Resistance and first feedback capacity are connected in parallel between the feedback input end and ground of the DC-DC modular converters；
First digital regulation resistance is connected with the MCU control module, and the MCU control module is by changing first number
The resistance of word potentiometer changes the sampled value of the voltage sample module output.
3. power circuit as claimed in claim 2, it is characterised in that the voltage sample module also includes the first electric capacity, institute
The one end for stating the first electric capacity connects the fixing end that first digital regulation resistance is connected with the first sampling resistor, first electric capacity
The other end ground connection.
4. power circuit as claimed in claim 1, it is characterised in that the current sample module includes：Second sampling resistor,
Second digital regulation resistance, in-phase amplifier, the second operational amplifier, the second diode, the second feedback resistance and the second feedback electricity
Hold；
Second sampling resistor is connected in the out-put supply negative line of the DC-DC modular converters, its one end ground connection, another
End connects the input of the in-phase amplifier, and the output end of the in-phase amplifier connects the one of second digital regulation resistance
Individual fixing end, another fixing end ground connection of second digital regulation resistance, the in-phase input end of second operational amplifier
The sliding end of second digital regulation resistance is connected, the inverting input of second operational amplifier is connected with output end, institute
The positive pole for stating the second diode connects the output end of second operational amplifier, and negative pole connects the DC-DC modular converters
Feedback input end, second feedback resistance and second feedback capacity are connected in the anti-of the DC-DC modular converters in parallel
Present between input and ground；
Second digital regulation resistance is connected with the MCU control module, and the MCU control module is by changing second number
The resistance of word potentiometer changes the sampled value of the current sample module output.
5. power circuit as claimed in claim 4, it is characterised in that the current sample module also includes the second electric capacity, institute
The one end for stating the second electric capacity connects the sliding end of second digital regulation resistance, the other end ground connection of second electric capacity.
6. the power circuit as described in claim any one of 2-5, it is characterised in that the power circuit also includes power supply mould
Block, for providing working power for the first or second operational amplifier, the power module includes：LDO chips and some filtering
Electric capacity；
The input of the LDO chips is connected with the input power, output end and the power supply of the first or second operational amplifier
End connection, earth terminal ground connection, the input and output end of the LDO chips are grounded by some filter capacitors.
7. power circuit as claimed in claim 6, it is characterised in that the power module also includes pressure unit, the drop
Pressure unit includes triode, first resistor, the 3rd electric capacity and the first voltage-regulator diode；
The colelctor electrode of the triode connects the input power, and colelctor electrode is connected with base stage by the 3rd resistor, described
3rd electric capacity and first voltage-regulator diode are connected in parallel between the transistor base and ground, the pole of the first voltage stabilizing two
The negative pole of pipe connects the transistor base, plus earth, and the emitter stage of the triode connects the input of the LDO chips
End.
8. power circuit as claimed in claim 7, it is characterised in that the power module also includes power supply instruction unit, institute
Stating power supply instruction unit includes current-limiting resistance and light emitting diode, and one end of the current-limiting resistance connects the defeated of the LDO chips
Go out end, the other end connects the positive pole of the light emitting diode, the negative pole ground connection of the light emitting diode.
9. power circuit as claimed in claim 1, it is characterised in that the DC-DC modular converters include：DC-DC changes core
Piece, inductance, the second voltage-regulator diode and some filter capacitors；
The inputs of the DC-DC conversion chips connects the input power, and output end connects one end of the inductance and described
The negative pole of second voltage-regulator diode, the other end of the inductance connects as out-put supply positive pole to be loaded, second voltage stabilizing two
One end of the plus earth of pole pipe, the input of the DC-DC conversion chips and inductance connection load passes through some filters
Ripple capacity earth.
10. power circuit as claimed in claim 1, it is characterised in that the power circuit also includes resettable fuse, institute
Resettable fuse is stated to be connected on the transmission line of the input power.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710781076.6A CN107681464A (en) | 2017-09-01 | 2017-09-01 | A kind of power circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710781076.6A CN107681464A (en) | 2017-09-01 | 2017-09-01 | A kind of power circuit |
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| CN109270026A (en) * | 2018-12-14 | 2019-01-25 | 河北大学 | A kind of near-infrared receives and launch control unit |
| CN114460875A (en) * | 2021-12-30 | 2022-05-10 | 深圳市辰卓科技有限公司 | Power supply circuit and camera testing device |
| CN116682338A (en) * | 2023-06-16 | 2023-09-01 | 昆山迈致治具科技有限公司 | Voltage control circuit and universal screen test board |
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