CN109491436A - A kind of digital loaded self-adaptive constant-flow driver - Google Patents
A kind of digital loaded self-adaptive constant-flow driver Download PDFInfo
- Publication number
- CN109491436A CN109491436A CN201811598205.9A CN201811598205A CN109491436A CN 109491436 A CN109491436 A CN 109491436A CN 201811598205 A CN201811598205 A CN 201811598205A CN 109491436 A CN109491436 A CN 109491436A
- Authority
- CN
- China
- Prior art keywords
- module
- resistance
- amplifier
- input terminal
- output
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
- G05F1/565—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
- G05F1/565—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor
- G05F1/569—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor for protection
- G05F1/573—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor for protection with overcurrent detector
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Automation & Control Theory (AREA)
- Amplifiers (AREA)
Abstract
A kind of digital loaded self-adaptive constant-flow driver of the invention belongs to the technical field of electronic equipment, and primary structure has single-chip microcontroller (1), D/A converter module (2), power output module (3), load judgment module (4), delay compensation module (5), voltage tracking module (6) and power failure protection module (8) etc..The present invention can actively adapt to the variation of load at work, with high-efficient, adaptive load range is wide, highly-safe, high reliability.
Description
Technical field
The invention belongs to the technical fields of electronic equipment.In particular to a kind of digital loaded self-adaptive constant-flow driver.
Background technique
Constant-current source is in many fields such as LED drives, laser drives, sensor driving, the drivings of various glow discharge sources
Inside there is important application.The basic principle of constant-current source circuit be usually utilize the nonlinear characteristic of triode or field-effect tube with
And profound and negative feedbck technology, make the control for exporting current controlled voltage processed, the electricity of load is kept flow through when loading and changing
It flows constant.In constant-current source circuit, the stability of electric current and the efficiency of circuit are two vital parameters.
It is Chinese patent " a kind of number filed in this seminar on September 5th, 2016 with the immediate prior art of the present invention
(application number: 2016108010566), which increases a feedback to formula program controlled constant current source " on the basis of common constant-current source
Ring, and digital PID control is utilized, effectively increase the stability of output electric current and the reliability of circuit work.But
As other prior art constant-current source circuits, which there is a problem of to adaptive load ability difference.Specifically, a perseverance
Current source circuit can only drive a kind of load of fixation, or only allow to be supported on very a small range variation, cause when loading and increasing
The triode of control electric current enters saturation region, and then causes maximum output current to decline rapidly (can not to continue to keep controlled
Ground output constant current), and so that triode is entered under-voltage area when the load decreases and (because load is small, load what both ends generated
Voltage is also small, referred to as under-voltage in the art), since triode and load exist together in a series loop, and triode right and wrong
Linear unit, therefore the reduction of load voltage causes triode to automatically take on the extra voltage in circuit, and then leads to triode
Internal power consumption steeply rises, and the internal power consumption of triode belongs to " by-product " of circuit, and to the evil of system hundred, none is sharp: a side
The increase of facial canal power consumption can be such that tube temperature sharply increases and increase the risk (service life of lowering apparatus) that pipe is burnt out, separately
On the one hand power supply cannot be adjusted in time when the load causes the efficiency of entire circuit to be greatly lowered, this is by constant current
It is very unfavorable when source is for mobile device.Because when working on a mobile platform, in order to guarantee the cruise duration of system, effect
Rate is often the Xiang Zhibiao for needing emphasis to consider.In addition, there is no overcurrent power-off to protect in technical solution disclosed in above-mentioned patent
Protective function will lead to the wind that output electric current is more than limitation electric current (generally maximum safe current) when current limliting Module Fail
Load or the damage of instrument are caused in danger.
Therefore existing constant current source technology also needs to be optimized.
Summary of the invention
The technical problem to be solved by the present invention is to provide the digital load of one kind certainly for disadvantage of the existing technology
It adapts to constant-flow driver and is capable of the parameter of auto-adjusting circuit itself when load impedance changes, to adapt to the resistance of load
Resistance keeps high efficiency, and has the function of overcurrent power-off protection.
Specific technical solution of the invention is:
A kind of digital loaded self-adaptive constant-flow driver, structure have single-chip microcontroller 1, D/A converter module 2, power output mould
Block 3, input module 9, display module 10, analog-to-digital conversion module 11, power management module 13 and front panel 14；It is characterized in that,
There are also load judgment module 4, delay compensation module 5, voltage tracking module 6, overcurrent judgment module 7, power failure protection modules 8 for structure
With reference voltage module 12；Wherein, single-chip microcontroller 1 turns with display module 10, input module 9, analog-to-digital conversion module 11, digital-to-analogue respectively
Change the mold block 2 be connected, D/A converter module 2 is connected with power output module 3, power output module 3 respectively with analog-to-digital conversion module
11, load judgment module 4, overcurrent judgment module 7 are connected, and reference voltage module 12 is connected with load judgment module 4, load judgment
Module 4 is connected with delay compensation module 5, and delay compensation module 5 is connected with voltage tracking module 6, voltage tracking module 6 and power
Output module 3 be connected, overcurrent judgment module 7 is connected with power failure protection module 8, power failure protection module 8 respectively with power output mould
Block 3 is connected with voltage tracking module 6；Power management module 13 is the circuit that mains AC can be converted into DC voltage, is
Each module provides tri- kinds of DC voltages of Vcc, Vcc/2, Vdd；
The structure of the power output module 3 are as follows: one end of the switch of relay EK1 is as power output module 3
First input terminal, is denoted as port PWR-in1, the drain electrode of another termination field-effect tube Q1, and the as power output module 3
One output end is denoted as port PWR-out1, and a termination power Vdd of the coil of relay EK1, the other end is as power output
Second input terminal of module 3 is denoted as port PWR-in2, and the grid of field-effect tube Q1 is connected with the output end of amplifier U1A, source
Second output end of the pole as power output module 3, is denoted as port PWR-out2, and a termination amplifier U1A's of resistance R1 is same
Phase input terminal, and the third input terminal as power output module 3 are denoted as port PWR-in3, the other end conduct of resistance R1
4th input terminal of power output module 3, is denoted as port PWR-in4, is connected with the output end of D/A converter module 2；Amplifier
The inverting input terminal of U1A is connected with one end of one end of capacitor C1 and resistance R2, the output of the other end and amplifier U1A of capacitor C1
End is connected, the output of one end, the end of slide wire and amplifier U1B of slide rheostat W1 of the other end and slide rheostat W1 of resistance R2
End is connected, and the other end of slide rheostat W1 is connected with one end of resistance R3, and the reverse phase of the other end and amplifier U1B of resistance R3 is defeated
Enter end to be connected with one end of resistance R4, the other end ground connection of resistance R4, the non-inverting input terminal and one end phase of resistance Rs of amplifier U1B
Connect, and the third output end as power output module 3, is denoted as port PWR-out3, the other end ground connection of resistance Rs；
The structure of the load judgment module 4 are as follows: the non-inverting input terminal of amplifier U2A as load judgment module 4
One input terminal, is denoted as port Vjdg-in1, is connected with the port PWR-out1 of power output module 3, the reverse phase of amplifier U2A is defeated
Enter end to be connected with one end of the output end of amplifier U2A and resistance R5, the other end of resistance R5 and one end of resistance R6 and amplifier U3A
Non-inverting input terminal be connected, the other end of resistance R6 ground connection, the one of the output end of amplifier U3A and one end of resistance R8 and resistance R9
End be connected, the other end of resistance R8 is connected with one end of the inverting input terminal of amplifier U3A and resistance R7, the other end of resistance R7 and
The inverting input terminal of amplifier U2B is connected with the output end of amplifier U2B, and the non-inverting input terminal of amplifier U2B is as load judgment module 4
Second input terminal, be denoted as port Vjdg-in2, be connected with the port PWR-out2 of power output module 3, resistance R9's is another
One end is connected with the non-inverting input terminal of one end of resistance R10 and amplifier U3B, another termination power Vcc/2 of resistance R10, amplifier
The output end of U3B is connected with one end of resistance R12, and the output end as load judgment module 4, is denoted as port Vjdg-out,
It is connected with the input terminal of delay compensation module 5, one end phase of the other end of resistance R12 and the inverting input terminal of amplifier U3B and R11
Even, the other end of resistance R11 is connected with the inverting input terminal of the output end of amplifier U4B and amplifier U4B, and amplifier U4B's is same mutually defeated
Enter end to be connected with the end of slide wire of slide rheostat W2, one end ground connection of slide rheostat W2, the other end is as load judgment module 4
Third input terminal, be denoted as port Vjdg-in3, be connected with the output end of reference voltage module 12；
The structure of the reference voltage module 12 are as follows: a termination power Vcc of resistance R37, the other end and two pole of pressure stabilizing
The cathode of pipe D2 is connected with one end of slide rheostat W5, the anode of zener diode D2 and another termination of slide rheostat W5
The end of slide wire on ground, slide rheostat W5 is connected with the non-inverting input terminal of amplifier U7B, the inverting input terminal and amplifier U7B of amplifier U7B
Output end be connected, and the output end of module 12 as the reference voltage is denoted as port Vref-out, with load judgment module 4
Port Vjdg-in3 is connected；
The structure of the delay compensation module 5 are as follows: one end of resistance R13 is connected with one end of resistance R18, and as prolonging
When compensating module 5 input terminal, be denoted as port Vdly-in, be connected with the port Vjdg-out of load judgment module 4, resistance R13
The other end be connected with one end of the inverting input terminal of amplifier U4A and resistance R15, the non-inverting input terminal of amplifier U4A and resistance R14
One end be connected, another termination power Vcc/2 of resistance R14, the output end and resistance of the other end of resistance R15 and amplifier U4A
One end of R16 is connected, the other end of resistance R16 and one end, one end of resistance R21 and the anti-phase input of amplifier U5A of resistance R17
End is connected, and the other end of resistance R17 is connected with the output end of amplifier U5A, and the output end as delay compensation module 5, is denoted as
Port Vdly-out is connected with second input terminal of voltage tracking module 6, and the non-inverting input terminal of amplifier U5A is with resistance R22's
One end is connected, and the other end of resistance R22 is connected with power Vcc/2, the other end of resistance R21 and one end, the capacitor C2 of resistance R20
One end be connected with the output end of amplifier U5B, the anti-phase input of the other end of the other end of resistance R20 and capacitor C2, amplifier U5B
The other end of end and resistance R18 are connected, the non-inverting input terminal of a termination amplifier U5B of resistance R19, another termination Vcc/2；
The structure of the voltage tracking module 6 is termination power Vcc/2 of resistance R23, the other end and amplifier U6A
Reverse input end be connected, the non-inverting input terminal of amplifier U6A is connected with one end of one end of resistance R24, resistance R25, resistance R24
The other end be connected with the output end of amplifier U6A, the other end of resistance R25 is connected with the output end of amplifier U6B, resistance R26's
One end is connected with the output end of amplifier U6A, and the other end is connected with the reverse input end of amplifier U6B；One end of resistance R27 and amplifier
The noninverting input of U6B is connected, another termination power Vcc/2；One end of capacitor C3 and one end of resistance R28 are with amplifier U6B's
Reverse input end is connected, and the other end is connected with the output end of amplifier U6B, one end phase of the output end and resistance R29 of amplifier U6B
Even, the other end of resistance R29 is connected with the non-inverting input terminal of amplifier U7A, and first input as voltage tracking module 6
End, is denoted as port Vflw-in1, is connected with second output end of power failure protection module 8；One end of resistance R30 and amplifier U7A
Noninverting input be connected, second input terminal of the other end as voltage tracking module 6 is denoted as port Vflw-in2, and prolongs
When compensating module 5 port Vdly-out be connected；One end of resistance R31 is connected with the reverse input end of amplifier U7A, another termination
Power Vcc/2；The output end of amplifier U7A is connected with the grid of field-effect tube Q2, and the drain electrode of field-effect tube Q2 connects power Vcc, source
Pole connects one end of inductance L1 and the cathode of diode D1, the plus earth of diode D1, the other end and electrolytic capacitor of inductance L1
The anode of C4, the anode of electrolytic capacitor C5, one end of capacitor C6, one end of capacitor C7 are connected, and as voltage tracking module 6
Output end, be denoted as port Vflw-out, be connected with the port PWR-in1 of power output module 3；The cathode of electrolytic capacitor C4,
The other end of the cathode of electrolytic capacitor C5, the other end of capacitor C6 and capacitor C7 is grounded；
The structure of the overcurrent judgment module 7 is that the noninverting input of amplifier U9A is as the defeated of overcurrent judgment module 7
Enter end, is denoted as port OC-in, is connected with the port PWR-out3 of power output module 3；One end of resistance R35 is with amplifier U9A's
Reverse input end is connected, other end ground connection；One end of resistance R36 is connected with the reverse input end of amplifier U9A, the other end and sliding
One end of rheostat W3 is connected；The other end and end of slide wire of slide rheostat W3 and the output end of amplifier U9A and amplifier U9B's is same
It is connected to input terminal；A termination power Vdd of slide rheostat W4, other end ground connection, the reversed input of end of slide wire and amplifier U9B
End is connected；Output end of the output end of amplifier U9B as overcurrent judgment module 7, is denoted as port OC-out, with power failure protection module
Input terminal be connected；
The structure of the power failure protection module 8 is that two input terminals of NAND gate U8A are connected, and is denoted as port BRK-in,
As the input terminal of power failure protection module 8, be connected with the output end of overcurrent judgment module 7, the output of NAND gate U8A termination with it is non-
An input terminal of door U8B, the output end of another input termination NAND gate U8C of NAND gate U8B, the output of NAND gate U8B
The grid of an input terminal and field-effect tube Q3 of NAND gate U8C is terminated, another input termination capacitor C8's of NAND gate U8C
One end of one end and resistance R33, one end of another termination switch K1 of resistance R33 and one end of resistance R32, resistance R32's is another
The other end of one termination power Vdd, switch K1 and the other end of capacitor C8 are grounded；The source electrode of field-effect tube Q3 is grounded, resistance
First output end of the one end of R34 as power failure protection module 8, is denoted as port BRK-out1, and with power output module 3
Port PWR-in2 is connected, the drain electrode of another termination field-effect tube Q3 of resistance R34, and second as power failure protection module 8
Output end, is denoted as port BRK-out2, port BRK-out2 simultaneously with the port PWR-in3 of power output module 3 and voltage with
The port Vflw-in1 of track module 6 is connected；
The structure of the front panel 14 includes: liquid crystal display 1401, power switch 1402, display select button
1403, alternator indicator 1404, output alternator indicator 1405, parameter regulation knob 1406, reset button 1407, electric current are limited
Output indicator 1408, current output terminal mouth 1409.
In a kind of digital loaded self-adaptive constant-flow driver of the invention, the power Vcc, power Vcc/2, electricity
Source Vdd distinguishes preferred 48V, 24V and 5V.
In a kind of digital loaded self-adaptive constant-flow driver of the invention, the circuit of the delay compensation module 5
Parameter is preferably as follows: resistance R13, R14 4K, R15 40K, R16, R21 20K, R17, R20 10K, R18, R19 1K,
R22 is 5.1K, and capacitor C2 is 5PF.
Single-chip microcontroller 1, D/A converter module 2, analog-to-digital conversion module 11, input module 9, display module 10 and power management mould
Block 13 is the prior art, carries out conventional design according to actual needs.
The utility model has the advantages that
1, the present invention is cooperated using load judgment module, delay compensation module and voltage tracking module, realizes electric current
Source is to the adaptive of load impedance, so that load impedance, in wide variation, the device of the invention can be safe and stable, high
The work of effect ground.
2, the present invention is in design (calculated) load judgment module, and using special non-destructive testing technology, neither influencing, power is defeated
The output electric current of module does not influence to realize effective judgement to load variation under the premise of actual loading again out.
3, the present invention has overcurrent power-off protection function, when exporting electric current more than preset safety value, cuts off function rapidly
The current supply circuit of rate output module, and the control signal of power output module and voltage tracking module is locked to 0 simultaneously, it is real
Now to the multi-faceted protection of system, the safety of system is substantially increased.
4, power-off protection of the invention uses unidirectional trigger mechanism, once power-off protection is triggered, after needing debugging
Hand-reset could normally export electric current, to prevent power failure protection module perseveration near safety value, further improve
The safety of system.
Detailed description of the invention
Fig. 1 is overall structure diagram of the invention.
Fig. 2 is front panel schematic layout pattern of the invention.
Fig. 3 is the schematic diagram of power output module 3 of the invention.
Fig. 4 is the schematic diagram of load judgment module 4 of the invention.
Fig. 5 is the schematic diagram of delay compensation module 5 of the invention.
Fig. 6 is the schematic diagram of voltage tracking module 6 of the invention.
Fig. 7 is the schematic diagram of overcurrent judgment module 7 of the invention.
Fig. 8 is the schematic diagram of power failure protection module 8 of the invention.
Fig. 9 is the schematic diagram of reference voltage module 12 of the invention.
Specific embodiment
The working principle of the invention is described further below by specific embodiment, parameter marked in attached drawing is
The preferred parameter that each embodiment is selected, rather than the limitation of the protection scope to this patent.
The overall structure of the invention of embodiment 1
Overall structure of the invention is as shown in Figure 1, have single-chip microcontroller 1, D/A converter module 2, power output module 3, load
Judgment module 4, delay compensation module 5, voltage tracking module 6, overcurrent judgment module 7, power failure protection module 8, input module 9,
Display module 10, analog-to-digital conversion module 11, reference voltage module 12, power management module 13 and front panel 14；Wherein, single-chip microcontroller
1 is connected with display module 10, input module 9, analog-to-digital conversion module 11, D/A converter module 2 respectively, D/A converter module 2 with
Power output module 3 is connected, and power output module 3 judges mould with analog-to-digital conversion module 11, load judgment module 4, overcurrent respectively
Block 7 is connected, and reference voltage module 12 is connected with load judgment module 4, and load judgment module 4 is connected with delay compensation module 5, prolongs
When compensating module 5 be connected with voltage tracking module 6, voltage tracking module 6 is connected with power output module 3, overcurrent judgment module 7
It is connected with power failure protection module 8, power failure protection module 8 is connected with power output module 3 and voltage tracking module 6 respectively；Power supply
Management module 13 is the circuit that mains AC can be converted into DC voltage, provides Vcc, Vcc/2, Vdd tri- kinds for each module
DC voltage.
The power output module of the invention of embodiment 2
The basic circuit diagram of the power output module 3 as shown in figure 3, one end of the switch of relay EK1 as function
First input terminal of rate output module 3, is denoted as port PWR-in1, the drain electrode of another termination field-effect tube Q1, and as power
First output end of output module 3, is denoted as port PWR-out1, a termination power Vdd of the coil of relay EK1, another
Second input terminal as power output module 3 is held, is denoted as port PWR-in2, the grid of field-effect tube Q1 is with amplifier U1A's
Output end is connected, and second output end of the source electrode as power output module 3 is denoted as port PWR-out2, one end of resistance R1
The non-inverting input terminal of amplifier U1A, and the third input terminal as power output module 3 are connect, port PWR-in3, resistance are denoted as
Four input terminal of the other end of R1 as power output module 3, is denoted as port PWR-in4, defeated with D/A converter module 2
Outlet is connected；The inverting input terminal of amplifier U1A is connected with one end of one end of capacitor C1 and resistance R2, the other end of capacitor C1 with
The output end of amplifier U1A is connected, one end of the other end of resistance R2 and slide rheostat W1, the end of slide wire of slide rheostat W1 and
The output end of amplifier U1B is connected, and the other end of slide rheostat W1 is connected with one end of resistance R3, the other end and fortune of resistance R3
The inverting input terminal for putting U1B is connected with one end of resistance R4, the other end of resistance R4 ground connection, the non-inverting input terminal of amplifier U1B with
One end of resistance Rs is connected, and the third output end as power output module 3, is denoted as port PWR-out3, resistance Rs's
Other end ground connection.
Power output module converts voltage to corresponding output under the control for the voltage that D/A converter module 2 exports
Electric current is extremely loaded by the output of current output terminal mouth 1409 of front panel 14.
The load judgment module of the invention of embodiment 3
The schematic circuit of the load judgment module 4 is as shown in figure 4, the non-inverting input terminal of amplifier U2A is sentenced as load
First input terminal of disconnected module 4, is denoted as port Vjdg-in1, is connected with the port PWR-out1 of power output module 3, amplifier
The inverting input terminal of U2A is connected with one end of the output end of amplifier U2A and resistance R5, the other end of resistance R5 and the one of resistance R6
End is connected with the non-inverting input terminal of amplifier U3A, the other end ground connection of resistance R6, the output end of amplifier U3A and one end of resistance R8
It is connected with one end of resistance R9, the other end of resistance R8 is connected with one end of the inverting input terminal of amplifier U3A and resistance R7, resistance
The other end of R7 is connected with the output end of the inverting input terminal of amplifier U2B and amplifier U2B, the non-inverting input terminal conduct of amplifier U2B
Second input terminal of load judgment module 4, is denoted as port Vjdg-in2, the port PWR-out2 phase with power output module 3
Even, the other end of resistance R9 is connected with the non-inverting input terminal of one end of resistance R10 and amplifier U3B, another termination electricity of resistance R10
The output end of source Vcc/2, amplifier U3B are connected with one end of resistance R12, and the output end as load judgment module 4, are denoted as holding
Mouthful Vjdg-out, is connected with the input terminal of delay compensation module 5, the other end of resistance R12 and the inverting input terminal of amplifier U3B and
One end of R11 is connected, and the other end of resistance R11 is connected with the inverting input terminal of the output end of amplifier U4B and amplifier U4B, amplifier
The non-inverting input terminal of U4B is connected with the end of slide wire of slide rheostat W2, and one end ground connection of slide rheostat W2, the other end is as negative
The third input terminal for carrying judgment module 4, is denoted as port Vjdg-in3, is connected with the output end of reference voltage module 12.
When the load that the present invention is driven changes, since present invention output is constant current, load two will lead to
End voltage changes, and the field-effect tube in power output module 3 itself is shared since its non-linear behavior can then adjust
Voltage, therefore (i.e. power is defeated by port Vjdg-in1, Vjdg-in2 detection both ends field-effect tube Q1 for the load judgment module 4
Port PWR-out1 and PWR-out2 in module 3 out) voltage change realize to load variation judgement: load become larger when,
It loads both end voltage to increase, and then the voltage at the both ends Q1 becomes smaller；When load becomes smaller, load both end voltage becomes smaller, Q1 both end voltage
Then become larger.Since Q1 and load are in together in an output loop, flow through the electric current of Q1 minor change can all influence it is defeated
The stability of the electric current extremely loaded out, therefore requirement cannot influence to flow through the electricity of Q1 as far as possible when detecting on Q1 both end voltage
Stream, load judgment module 4 of the invention had both guaranteed that the detection to Q1 both end voltage reached using the design of high impedance non-destructive testing
Very high degree of precision, and guarantee not influence to flow through the electric current of Q1 completely when detection voltage.The voltage at the both ends Q1 detected and port
Reference voltage (coming from reference voltage module 12) at Vjdg-in3 is compared and asks poor, and difference determines rear class voltage-tracing
The module voltage to be adjusted.
The reference voltage module of the invention of embodiment 4
The schematic circuit of the reference voltage module 12 as shown in figure 9, the reference voltage module 14 structure are as follows:
A termination power Vcc of resistance R37, the other end are connected with one end of the cathode of zener diode D2 and slide rheostat W5, surely
The other end of the anode and slide rheostat W5 of pressing diode D2 is grounded, and the end of slide wire of slide rheostat W5 is same with amplifier U7B's
Phase input terminal is connected, and the inverting input terminal of amplifier U7B is connected with the output end of amplifier U7B, and module 12 as the reference voltage
Output end is denoted as port Vref-out, is connected with the port Vjdg-in3 of load judgment module 4.
The delay compensation module of the invention of embodiment 5
Since there are delay effects for inductance, the capacitance network in the voltage tracking module 6 of rear class, in load judgment mould
Block 4 detects that the final voltage tracking module 6 that changes to of load makes inevitably certain prolong is adaptively adjusted
When, therefore this invention takes compensation of delay designs, eliminate the delay by delay compensation module 5, make voltage tracking module 6
Voltage adaptation adjustment is completely in the detection of load judgment module 4 to work asynchronously, to realize accurate effective control.It is described
Delay compensation module 5 schematic circuit as shown in figure 5, one end of resistance R13 is connected with one end of resistance R18, and as prolonging
When compensating module 5 input terminal, be denoted as port Vdly-in, be connected with the port Vjdg-out of load judgment module 4, resistance R13
The other end be connected with one end of the inverting input terminal of amplifier U4A and resistance R15, the non-inverting input terminal of amplifier U4A and resistance R14
One end be connected, another termination power Vcc/2 of resistance R14, the output end and resistance of the other end of resistance R15 and amplifier U4A
One end of R16 is connected, the other end of resistance R16 and one end, one end of resistance R21 and the anti-phase input of amplifier U5A of resistance R17
End is connected, and the other end of resistance R17 is connected with the output end of amplifier U5A, and the output end as delay compensation module 5, is denoted as
Port Vdly-out is connected with second input terminal of voltage tracking module 6, and the non-inverting input terminal of amplifier U5A is with resistance R22's
One end is connected, and the other end of resistance R22 is connected with power Vcc/2, the other end of resistance R21 and one end, the capacitor C2 of resistance R20
One end be connected with the output end of amplifier U5B, the anti-phase input of the other end of the other end of resistance R20 and capacitor C2, amplifier U5B
The other end of end and resistance R18 are connected, the non-inverting input terminal of a termination amplifier U5B of resistance R19, another termination Vcc/2.
The voltage tracking module of the invention of embodiment 6
The schematic circuit of the voltage tracking module 6 as shown in fig. 6, resistance R23 termination power Vcc/2, it is another
End is connected with the reverse input end of amplifier U6A, non-inverting input terminal and one end of resistance R24, one end of resistance R25 of amplifier U6A
It is connected, the other end of resistance R24 is connected with the output end of amplifier U6A, the output end phase of the other end and amplifier U6B of resistance R25
Even, one end of resistance R26 is connected with the output end of amplifier U6A, and the other end is connected with the reverse input end of amplifier U6B；Resistance R27
One end be connected with the noninverting input of amplifier U6B, another termination power Vcc/2；One end of capacitor C3 and one end of resistance R28
It is connected with the reverse input end of amplifier U6B, the other end is connected with the output end of amplifier U6B, the output end and resistance of amplifier U6B
One end of R29 is connected, and the other end of resistance R29 is connected with the non-inverting input terminal of amplifier U7A, and as voltage tracking module 6
First input terminal, is denoted as port Vflw-in1, is connected with second output end of power failure protection module 8；One end of resistance R30
It is connected with the noninverting input of amplifier U7A, second input terminal of the other end as voltage tracking module 6 is denoted as port Vflw-
In2 is connected with the port Vdly-out of delay compensation module 5；One end of resistance R31 is connected with the reverse input end of amplifier U7A,
Another termination power Vcc/2；The output end of amplifier U7A is connected with the grid of field-effect tube Q2, and the drain electrode of field-effect tube Q2 connects electricity
Source Vcc, source electrode connect one end of inductance L1 and the cathode of diode D1, the plus earth of diode D1, the other end of inductance L1 with
The anode of electrolytic capacitor C4, the anode of electrolytic capacitor C5, one end of capacitor C6, one end of capacitor C7 are connected, and as voltage
The output end of tracking module 6 is denoted as port Vflw-out, is connected with the port PWR-in1 of power output module 3；Electrolytic capacitor
The cathode of C4, the cathode of electrolytic capacitor C5, the other end of capacitor C6 and capacitor C7 the other end be grounded.
Voltage tracking module 6 is output to power output mould after automatically adjusting the voltage vcc that power management module 13 provides
The port PWR-in1 of block 3, the power voltage of the electric current output loop as power output module 3, the voltage can follow load
Variation, when load changes, so that redundancy or not will not both occur because of load reduction in the voltage PWR-in1 of port at
Can be insufficient because load becomes larger, it works in always " critical state ", ensure that the maximal efficiency of whole system.
The overcurrent judgment module of the invention of embodiment 7
The schematic circuit of the overcurrent judgment module 7 is as shown in fig. 7, the noninverting input of amplifier U9A is sentenced as overcurrent
The input terminal of disconnected module 7, is denoted as port OC-in, is connected with the port PWR-out3 of power output module 3；One end of resistance R35
It is connected with the reverse input end of amplifier U9A, other end ground connection；One end of resistance R36 is connected with the reverse input end of amplifier U9A,
The other end is connected with one end of slide rheostat W3；The other end and end of slide wire of slide rheostat W3 and the output end of amplifier U9A
And the noninverting input of amplifier U9B is connected；A termination power Vdd of slide rheostat W4, other end ground connection, end of slide wire and amplifier
The reverse input end of U9B is connected；Output end of the output end of amplifier U9B as overcurrent judgment module 7, is denoted as port OC-out,
It is connected with the input terminal of power failure protection module.
The module real-time detection power output module output current value, and with the (sliding of You Tuzhong of the safety value of setting
Rheostat W4 setting) it is compared, when the electric current of reality output is more than the safety value of setting, can be exported by port OC-out
Over-current signal executes de-energizing actions for triggering power failure protection module 8.
The power failure protection module 8 of the invention of embodiment 8
The schematic circuit of power failure protection module 8 of the invention is as shown in figure 8, two input terminals of NAND gate U8A are connected, note
It is connected as the input terminal of power failure protection module 8 with the output end of overcurrent judgment module 7 for port BRK-in, NAND gate U8A
Output termination NAND gate U8B an input terminal, NAND gate U8B another input termination NAND gate U8C output end, with
The grid of an input terminal and field-effect tube Q3 of the output termination NAND gate U8C of NOT gate U8B, another of NAND gate U8C are defeated
Enter one end of termination capacitor C8 and one end of resistance R33, the one of one end of another termination switch K1 of resistance R33 and resistance R32
End, another termination power Vdd of resistance R32, the other end of switch K1 and the other end of capacitor C8 are grounded；Field-effect tube Q3's
Source electrode ground connection, first output end of the one end of resistance R34 as power failure protection module 8 are denoted as port BRK-out1, and and function
The port PWR-in2 of rate output module 3 is connected, the drain electrode of another termination field-effect tube Q3 of resistance R34, and as power-off protection
Second output end of module 8 is denoted as port BRK-out2, port BRK-out2 while the port with power output module 3
PWR-in3 is connected with the port Vflw-in1 of voltage tracking module 6.
" over-current signal " of the module real-time monitoring overcurrent judgment module 7 can be touched when over-current signal effectively (high level)
De-energizing actions are sent out, i.e. control field-effect tube Q3 conducting, port BRK-out1 and the port PWR-in2 phase in power output module 3
Even, the relay EK1 in power output module 3 will be triggered to disconnect switch, cuts off the energy source in output current loop；And
Port BRK-out2 is connected with the port Vflw-in1 of the port PWR-in3 of power output module 3, voltage tracking module 6 simultaneously,
Make voltage at port PWR-in3, port Vflw-in1 while being restricted to 0, at the same cut off power output module 3 and voltage with
The control voltage of track module 6 further improves the validity and safety of power-off.Power failure protection module 8 also takes simultaneously
Unidirectional irreversible triggering mode, even if power-off signal disappears, will not be stood once power-off signal occurs triggering de-energizing actions
It carves and releases off-position, but need to release by manually actuated switch K1 (reset button 1407 i.e. on front panel 14)
Off-position, to prevent trigger signal from triggering repeatedly in safety value Near The Critical Point.
The front panel of the invention of embodiment 9
The structure of the front panel 14 is as shown in Figure 2, comprising: liquid crystal display 1401, power switch 1402, display choosing
Select button 1403, limitation alternator indicator 1404, output alternator indicator 1405, parameter regulation knob 1406, reset button
1407, electric current output indicator 1408, current output terminal mouth 1409.
The liquid crystal display 1401 is connected by display module 10 with single-chip microcontroller 1, for the limit of display system setting
The actual current value (being switched over by 1403 control single chip computer of display select button) of current value or power output module output processed,
The power switch 1402 is the battery main switch of whole device, and the display select button 1403 is aobvious for switchable liquid crystal
Information shown by display screen 1401, the limitation alternator indicator 1404, output alternator indicator 1405 are two luminous two
Pole pipe is used to refer to liquid crystal display 1401 currently it is shown that limitation electric current still exports electric current, the parameter regulation rotation
Button 1406 is a rotary encoder, parameter needed for being used to input to single-chip microcontroller, and the reset button 1407 is described breaks
Switch K1 in electric protection module 8 is used to reset system worked well after debugging when power-off protection occurs in system,
The current output terminal mouth 1409 is the interface of a two-phase, positive and negative electrode respectively with the port PWR- in power output module 3
Out2, port PWR-out3 are connected, and the electric current for generating the present apparatus is exported to the load for needing constant current to drive.When system just
Often work, when having electric current output, electric current output indicator 1408 is bright.
Claims (3)
1. a kind of digital loaded self-adaptive constant-flow driver, single-chip microcontroller (1), D/A converter module (2), power output module
(3), input module (9), display module (10), analog-to-digital conversion module (11), power management module (13) and front panel (14)；Its
It is characterized in that, there are also load judgment module (4), delay compensation module (5), voltage tracking modules (6), overcurrent judgment module for structure
(7), power failure protection module (8) and reference voltage module (12),；Wherein, single-chip microcontroller (1) respectively with display module (10), input
Module (9), analog-to-digital conversion module (11), D/A converter module (2) are connected, D/A converter module (2) and power output module (3)
Be connected, power output module (3) respectively with analog-to-digital conversion module (11), load judgment module (4), overcurrent judgment module (7) phase
Even, reference voltage module (12) is connected with load judgment module (4), load judgment module (4) and delay compensation module (5) phase
Even, delay compensation module (5) is connected with voltage tracking module (6), and voltage tracking module (6) is connected with power output module (3),
Overcurrent judgment module (7) is connected with power failure protection module (8), power failure protection module (8) respectively with power output module (3) and electricity
Tracking module (6) are pressed to be connected；Power management module (13) is the circuit that mains AC can be converted into DC voltage, is each mould
Block provides tri- kinds of DC voltages of Vcc, Vcc/2, Vdd；
The structure of the power output module (3) are as follows: one end of the switch of relay EK1 is as power output module (3)
First input terminal, is denoted as port PWR-in1, the drain electrode of another termination field-effect tube Q1, and as power output module (3)
First output end, is denoted as port PWR-out1, a termination power Vdd of the coil of relay EK1, and the other end is defeated as power
Second input terminal of module (3) out is denoted as port PWR-in2, the output end phase of the grid and amplifier U1A of field-effect tube Q1
Even, second output end of the source electrode as power output module (3) is denoted as port PWR-out2, a termination amplifier of resistance R1
The non-inverting input terminal of U1A, and the third input terminal as power output module (3), are denoted as port PWR-in3, resistance R1's
Four input terminal of the other end as power output module (3), is denoted as port PWR-in4, defeated with D/A converter module (2)
Outlet is connected；The inverting input terminal of amplifier U1A is connected with one end of one end of capacitor C1 and resistance R2, the other end of capacitor C1 with
The output end of amplifier U1A is connected, one end of the other end of resistance R2 and slide rheostat W1, the end of slide wire of slide rheostat W1 and
The output end of amplifier U1B is connected, and the other end of slide rheostat W1 is connected with one end of resistance R3, the other end and fortune of resistance R3
The inverting input terminal for putting U1B is connected with one end of resistance R4, the other end of resistance R4 ground connection, the non-inverting input terminal of amplifier U1B with
One end of resistance Rs is connected, and the third output end as power output module (3), is denoted as port PWR-out3, resistance Rs
The other end ground connection；
The structure of the load judgment module (4) are as follows: the non-inverting input terminal of amplifier U2A as load judgment module (4)
One input terminal, is denoted as port Vjdg-in1, is connected with the port PWR-out1 of power output module (3), the reverse phase of amplifier U2A
Input terminal is connected with one end of the output end of amplifier U2A and resistance R5, the other end of resistance R5 and one end of resistance R6 and amplifier
The non-inverting input terminal of U3A is connected, the other end ground connection of resistance R6, the output end of amplifier U3A and one end of resistance R8 and resistance R9
One end be connected, the other end of resistance R8 is connected with one end of the inverting input terminal of amplifier U3A and resistance R7, and resistance R7's is another
End is connected with the output end of the inverting input terminal of amplifier U2B and amplifier U2B, and the non-inverting input terminal of amplifier U2B is as load judgment
Second input terminal of module (4), is denoted as port Vjdg-in2, is connected with the port PWR-out2 of power output module (3), electricity
The other end of resistance R9 is connected with the non-inverting input terminal of one end of resistance R10 and amplifier U3B, another termination power of resistance R10
The output end of Vcc/2, amplifier U3B are connected with one end of resistance R12, and the output end as load judgment module (4), are denoted as holding
Mouth Vjdg-out, is connected with the input terminal of delay compensation module (5), the other end of resistance R12 and the inverting input terminal of amplifier U3B
It is connected with one end of R11, the other end of resistance R11 is connected with the inverting input terminal of the output end of amplifier U4B and amplifier U4B, fortune
The non-inverting input terminal for putting U4B is connected with the end of slide wire of slide rheostat W2, one end ground connection of slide rheostat W2, other end conduct
The third input terminal of load judgment module (4), is denoted as port Vjdg-in3, the output end phase with reference voltage module (12)
Even；
The structure of the reference voltage module (12) are as follows: a termination power Vcc of resistance R37, the other end and zener diode
The cathode of D2 is connected with one end of slide rheostat W5, the anode of zener diode D2 and another termination of slide rheostat W5
The end of slide wire on ground, slide rheostat W5 is connected with the non-inverting input terminal of amplifier U7B, the inverting input terminal and amplifier U7B of amplifier U7B
Output end be connected, and the output end of module (12) as the reference voltage is denoted as port Vref-out, with load judgment module
(4) port Vjdg-in3 is connected；
The structure of the delay compensation module (5) are as follows: one end of resistance R13 is connected with one end of resistance R18, and as delay
The input terminal of compensating module (5), is denoted as port Vdly-in, is connected with the port Vjdg-out of load judgment module (4), resistance
The other end of R13 is connected with one end of the inverting input terminal of amplifier U4A and resistance R15, the non-inverting input terminal and resistance of amplifier U4A
One end of R14 is connected, another termination power Vcc/2 of resistance R14, the other end of resistance R15 and the output end and electricity of amplifier U4A
The one end for hindering R16 is connected, and the other end of resistance R16 and the reverse phase of one end of resistance R17, one end of resistance R21 and amplifier U5A are defeated
Entering end to be connected, the other end of resistance R17 is connected with the output end of amplifier U5A, and the output end as delay compensation module (5),
It is denoted as port Vdly-out, is connected with second input terminal of voltage tracking module (6), the non-inverting input terminal and electricity of amplifier U5A
The one end for hindering R22 is connected, and the other end of resistance R22 is connected with power Vcc/2, the other end of resistance R21 and the one of resistance R20
It holds, one end of capacitor C2 is connected with the output end of amplifier U5B, the other end of resistance R20 and the other end, the amplifier U5B of capacitor C2
Inverting input terminal and resistance R18 the other end be connected, resistance R19 one termination amplifier U5B non-inverting input terminal, another termination
Vcc/2；
The structure of the voltage tracking module (6) is that termination power Vcc/2 of resistance R23, the other end is with amplifier U6A's
Reverse input end is connected, and the non-inverting input terminal of amplifier U6A is connected with one end of one end of resistance R24, resistance R25, resistance R24's
The other end is connected with the output end of amplifier U6A, and the other end of resistance R25 is connected with the output end of amplifier U6B, and the one of resistance R26
End is connected with the output end of amplifier U6A, and the other end is connected with the reverse input end of amplifier U6B；One end of resistance R27 and amplifier
The noninverting input of U6B is connected, another termination power Vcc/2；One end of capacitor C3 and one end of resistance R28 are with amplifier U6B's
Reverse input end is connected, and the other end is connected with the output end of amplifier U6B, one end phase of the output end and resistance R29 of amplifier U6B
Even, the other end of resistance R29 is connected with the non-inverting input terminal of amplifier U7A, and first input as voltage tracking module (6)
End, is denoted as port Vflw-in1, is connected with second output end of power failure protection module (8)；One end of resistance R30 and amplifier
The noninverting input of U7A is connected, and second input terminal of the other end as voltage tracking module (6) is denoted as port Vflw-in2,
It is connected with the port Vdly-out of delay compensation module (5)；One end of resistance R31 is connected with the reverse input end of amplifier U7A, separately
One termination power Vcc/2；The output end of amplifier U7A is connected with the grid of field-effect tube Q2, and the drain electrode of field-effect tube Q2 connects power supply
Vcc, source electrode connect one end of inductance L1 and the cathode of diode D1, the plus earth of diode D1, the other end and electricity of inductance L1
Solve the anode of capacitor C4, the anode of electrolytic capacitor C5, one end of capacitor C6, capacitor C7 one end be connected, and as voltage with
The output end of track module (6), is denoted as port Vflw-out, is connected with the port PWR-in1 of power output module (3)；Electrolysis electricity
The other end for holding the cathode of C4, the cathode of electrolytic capacitor C5, the other end of capacitor C6 and capacitor C7 is grounded；
The structure of the overcurrent judgment module (7) is that the noninverting input of amplifier U9A is as the defeated of overcurrent judgment module (7)
Enter end, is denoted as port OC-in, is connected with the port PWR-out3 of power output module (3)；One end of resistance R35 and amplifier U9A
Reverse input end be connected, the other end ground connection；One end of resistance R36 is connected with the reverse input end of amplifier U9A, the other end and cunning
One end of dynamic rheostat W3 is connected；The other end and end of slide wire of slide rheostat W3 and the output end of amplifier U9A and amplifier U9B's
Noninverting input is connected；A termination power Vdd of slide rheostat W4, other end ground connection, end of slide wire are reversed defeated with amplifier U9B's
Enter end to be connected；Output end of the output end of amplifier U9B as overcurrent judgment module (7), is denoted as port OC-out, with power-off protection
One input terminal of module is connected；
The structure of the power failure protection module (8) is that two input terminals of NAND gate U8A are connected, and are denoted as port BRK-in, is made
For the input terminal of power failure protection module (8), be connected with the output end of overcurrent judgment module (7), the output of NAND gate U8A termination with
An input terminal of NOT gate U8B, the output end of another input termination NAND gate U8C of NAND gate U8B, NAND gate U8B's is defeated
The grid of an input terminal and field-effect tube Q3 of NAND gate U8C, another input termination capacitor C8 of NAND gate U8C are terminated out
One end and resistance R33 one end, one end of another termination switch K1 of resistance R33 and one end of resistance R32, resistance R32's
The other end of another termination power Vdd, switch K1 and the other end of capacitor C8 are grounded；The source electrode of field-effect tube Q3 is grounded, electricity
First output end of the one end as power failure protection module (8) for hindering R34, is denoted as port BRK-out1, and with power output mould
The port PWR-in2 of block (3) is connected, the drain electrode of another termination field-effect tube Q3 of resistance R34, and as power failure protection module
(8) second output end is denoted as port BRK-out2, port BRK-out2 while the port with power output module (3)
PWR-in3 is connected with the port Vflw-in1 of voltage tracking module (6)；
The structure of the front panel (14) includes: liquid crystal display (1401), power switch (1402), display select button
(1403), alternator indicator (1404), output alternator indicator (1405), parameter regulation knob (1406), reset button are limited
(1407), electric current output indicator (1408), current output terminal mouth (1409).
2. a kind of digital loaded self-adaptive constant-flow driver according to claim 1, which is characterized in that the power supply
Vcc, power Vcc/2, power supply Vdd are respectively 48V, 24V and 5V.
3. a kind of digital loaded self-adaptive constant-flow driver according to claim 1, which is characterized in that the delay
The circuit parameter of compensating module (5) is as follows: resistance R13, R14 4K, R15 40K, R16, R21 20K, R17, R20 10K,
R18, R19 1K, R22 5.1K, capacitor C2 are 5pF.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811598205.9A CN109491436B (en) | 2018-12-26 | 2018-12-26 | Digital load self-adaptive constant current driver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811598205.9A CN109491436B (en) | 2018-12-26 | 2018-12-26 | Digital load self-adaptive constant current driver |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109491436A true CN109491436A (en) | 2019-03-19 |
| CN109491436B CN109491436B (en) | 2020-10-20 |
Family
ID=65712081
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811598205.9A Expired - Fee Related CN109491436B (en) | 2018-12-26 | 2018-12-26 | Digital load self-adaptive constant current driver |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109491436B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4357574A (en) * | 1979-05-21 | 1982-11-02 | Takamisawa Cybernetics Co., Ltd. | Loading apparatus for testing a power supply |
| CN101540476A (en) * | 2009-04-07 | 2009-09-23 | 吉林大学 | Constant current driver of digital semiconductor laser |
| CN105375579A (en) * | 2015-12-09 | 2016-03-02 | 百色学院 | Bidirectional DC (Direct Current)-DC (Direct Current) converter for battery energy storage device |
| CN106444945A (en) * | 2016-09-05 | 2017-02-22 | 吉林大学 | Digital program-control constant current source |
-
2018
- 2018-12-26 CN CN201811598205.9A patent/CN109491436B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4357574A (en) * | 1979-05-21 | 1982-11-02 | Takamisawa Cybernetics Co., Ltd. | Loading apparatus for testing a power supply |
| CN101540476A (en) * | 2009-04-07 | 2009-09-23 | 吉林大学 | Constant current driver of digital semiconductor laser |
| CN105375579A (en) * | 2015-12-09 | 2016-03-02 | 百色学院 | Bidirectional DC (Direct Current)-DC (Direct Current) converter for battery energy storage device |
| CN106444945A (en) * | 2016-09-05 | 2017-02-22 | 吉林大学 | Digital program-control constant current source |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109491436B (en) | 2020-10-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102005718B (en) | Protector for electronic load and electronic load system | |
| CN105181542A (en) | Intelligent environment monitoring instrument | |
| CN109613952A (en) | A kind of loaded self-adaptive constant current generation circuit | |
| CN109634345A (en) | A kind of program control type loaded self-adaptive time variant voltage constant current source module | |
| CN109491436A (en) | A kind of digital loaded self-adaptive constant-flow driver | |
| CN109713564A (en) | A kind of impedance self-adaptive laser diode drive | |
| CN109343637A (en) | A kind of voltage-tracing type constant-current source device | |
| CN109445506A (en) | A kind of Portable voltage following-up type constant current source module | |
| CN109474177A (en) | A kind of digital loaded self-adaptive time variant voltage constant-current source circuit | |
| CN109656297A (en) | A kind of program control type loaded self-adaptive constant current source module | |
| CN209625074U (en) | A kind of Portable voltage following-up type constant current source module | |
| CN109412001A (en) | A kind of digital high efficiency laser pumping source | |
| CN109412005A (en) | A kind of program control type high efficiency laser pump (ing) source module | |
| CN109358696A (en) | A kind of loaded self-adaptive time variant voltage constant-current source circuit | |
| CN109491441A (en) | A kind of loaded self-adaptive constant current source module | |
| CN205015391U (en) | Medical stand -by power supply voltage detecting early warning circuit | |
| CN208239920U (en) | A kind of computer power | |
| CN109659811A (en) | A kind of digital impedance self-adaptive laser diode drive | |
| CN109358695A (en) | A kind of loaded self-adaptive constant-current source device | |
| CN203274949U (en) | Over-temperature detection and protection circuit of current transformer | |
| CN109524876A (en) | A kind of program control type impedance self-adaptive laser diode drive module | |
| CN202795622U (en) | Light-controlled type door magnetic sensor | |
| CN217902334U (en) | Voltage range monitoring circuit based on voltage reference device | |
| CN109459652A (en) | Off-mode judgement and closedown method, detection circuit, power-supply management system | |
| CN109412002A (en) | A kind of high efficiency laser pump (ing) source device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20201020 Termination date: 20211226 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |