CN110198581A - A kind of current driver of high efficiency multichannel - Google Patents
A kind of current driver of high efficiency multichannel Download PDFInfo
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- CN110198581A CN110198581A CN201910334607.6A CN201910334607A CN110198581A CN 110198581 A CN110198581 A CN 110198581A CN 201910334607 A CN201910334607 A CN 201910334607A CN 110198581 A CN110198581 A CN 110198581A
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/40—Details of LED load circuits
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
- H05B47/10—Controlling the light source
Abstract
The present invention relates to a kind of current drivers of high efficiency multichannel, for realizing the current loading of driving single channel or multi-channel, realize that the mode of electric current driving is different from the fixed output voltage of tradition, the present invention passes through the selection between detection load voltage and multichannel, while the driving of the electric current needed for meeting, it realizes the automatic adjusument of output voltage, and then improves entire drive efficiency.The current driving circuit includes that reference voltage generates unit, exports current regulation unit, channel selection unit, switch power converter unit.The driving current information of external setting-up generates cell processing by reference voltage, generates the reference signal of output electric current, control the output electric current in each channel；Channel selection unit detects load information simultaneously, and the load information after screening is then fed back to switch power converter, adjusts the output voltage of the invention, so that it is not only met the demand of output electric current driving, but also improve the efficiency of entire driver.
Description
Technical field
The present invention relates to a kind of drives of the electric current of the current driver field of current source loads more particularly to high efficiency multichannel
Dynamic device.
Background technique
Electric current driving is most basic in integrated circuit, one of most common concept, it provides electricity required for output loading
Stream.It is widely used in industrial production, scientific research and sphere of life, especially power supply, and multichannel charger and LED shine
Bright field also proposed new demand to power supply, multichannel high-efficient rate is a kind of as people are to the height requirement of the system integration
The direction of mainstream, in addition in LED illumination System, constant current mode driving is a kind of current the most widely used applied topology, with
Lighting power, display area and the increase displayed contrast, the research of multi-channel current driver gradually paid attention to.Usually
Meet driving current load, fixed voltage is set and realizes the purpose.However, with manufacturing process, temperature and driving current
The influence that output equivalent is loaded of the factors such as size so that different channels export connected equivalent load can difference it is very big,
If driving current needed for the mode for continuing to use fixed output voltage meets output, sufficiently high fixed output is needed in design
Voltage covers above-mentioned variation bring equivalent load deviation, and system effectiveness can be made to bring loss.Therefore in order to improve system effectiveness,
Guarantee the electric current driving of multichannel simultaneously, the load lower terminal voltage in each channel will be detected, and it is logical that simultaneous selection goes out maximum load
The Voltage Feedback in road returns the generation circuit of output voltage, and output voltage is made to meet voltage value necessary to driving current, thus real
Adaptive behavior of the existing current driver according to loading condition automatic adjustment output voltage, obtains the efficiency of entire current driver
To optimization.
Summary of the invention
The present invention provides a kind of current driver circuits of high efficiency multichannel, can be realized the electricity of single channel to multichannel
Stream driving, load device output electric current can accurately be set, and imitate entire driver by the adaptive mode of output voltage
Rate is promoted.
A kind of current driver circuits of high efficiency multichannel of the present invention, including reference voltage generate unit, defeated
Current regulation unit out, channel selection unit, switch power converter unit.
Wherein reference voltage generates the reference signal that unit generates output electric current and voltage, determines output electric current and output electricity
Pressure, the reference voltage for exporting electric current are input from the outside information and convert, and output voltage refers to the reference electricity by output electric current
Laminated adds fixed voltage voltage relevant to output electric current to generate, so that output voltage be made to adapt to different input currents automatically
Setting, reach higher efficiency；
It exports current regulation unit and passes through output current reference signal, operational amplifier, current sampling resistor, output electric current
The components such as adjustment pipe make output electric current flow through external loading with constant current mode, and output current value is approximately equal to output current reference electricity
Pressure is divided by sampling resistor；Export the current regulating circuit that current regulation unit includes one or more channels, every channel current tune
(x is pair by economize on electricity routing operational amplifier, output adjustment pipe NM_x (x is corresponding channel), output current sampling resistor Rsen_x
The channel answered) three parts composition；Wherein each channel operation amplifier forward end is all connected with same signal, i.e. reference voltage generates single
The output current reference signal that member generates, operational amplifier negative phase end and the source and sampling resistor Rsen_x mono- for adjusting pipe NM_x
End links together, sampling resistor Rsen_x other end ground connection；The drain terminal of adjustment pipe NM_x is connected with one end of output loading.
In the case of entire driver the operation is stable, output current regulation unit can make the output electric current in each channel can
Realize the value of setting, which is approximately equal to reference voltage and generates output current reference signal and sampling resistor that unit generates
The ratio of Rsen_x.
Channel selection unit adjusts the detection of pipe NM_x drain terminal voltage by the electric current to channel each in current regulation unit,
Maximum load channel information is selected, and the information is fed back into switch power converter as output voltage sampled signal；
Above-mentioned sampled signal is input to Switching Power Supply conversion converter, combines output voltage reference signal, puts via error
Big device is converted to the duty cycle signals for adjusting output stage driver turn-on time, finally by output voltage stabilization to required voltage
Value, because output voltage is related to output current reference with reference to generating, output voltage under driver stable state can be provided most
The output electric current in heavy load channel, while avoiding output voltage is excessively high system effectiveness is caused excessively to be lost.What is either used opens
Powered-down source converter unit, or relative to output voltage caused by setting electric current value, the two means can bring efficiency
It is obviously improved, and has higher electric current setting accuracy；Additionally, due to the adaptive characteristic of output voltage, make application spirit of the invention
It is living, it is convenient.
Detailed description of the invention
The functional block diagram of Fig. 1 high efficiency multi-channel current driver；
The preferred embodiment circuit diagram of Fig. 2 output current regulation unit；
The preferred embodiment circuit diagram of Fig. 3 output voltage part.
Specific embodiment
Technical solution of the present invention is described further with reference to the accompanying drawing.It has focused solely on as shown in the figure and understands each section
Principle explanation.
Fig. 1 is the functional block diagram of high efficiency multi-channel current driver of the present invention, illustrates the current driver of multichannel
The basic structure of circuit, the circuit can drive to the constant electric current of the load offer in each channel in the steady state, wherein external
One terminator actuator output voltage VO UT of load, (x is to correspond to the output Vdr_x in another termination each channel of current adjustment unit
Channel).
As shown in Figure 1, the current driving circuit of high efficiency multichannel of the present invention includes that reference voltage generates unit U1,
Export current regulation unit U2, channel selection unit U3, switch power converter unit U4.
With reference to Fig. 3, wherein reference voltage generates unit U1 and mainly generates two signals, i.e. output current reference Vref and defeated
The reference signal Vref+Vmg of voltage out exports the reference of electric current by outside respectively to determine output electric current and output voltage
The information of setting carries out scale operation realization via the unit, and the reference of output voltage is folded by the reference information of output electric current
Add a fixed voltage or voltage relevant to output electric current to realize, guarantees the output voltage of current driver under stable state by every
Pressure drop can satisfy the demand that output current regulation unit U3 is worked normally after the load in a channel；
Fig. 2 is the circuit diagram of the output current regulation unit U2 in Fig. 1, output can be made negative by the circuit present invention
It carries current work current value of output loading under constant current mode, stable state and is approximately equal to output current reference voltag divided by sampling electricity
Resistance.Wherein the current regulating circuit in each channel by operational amplifier OPA_x (x is corresponding channel), adjust by output in the unit
Homogeneous tube NM_x (x is corresponding channel), output current sampling resistor Rsen_x (x is corresponding channel) three parts are constituted.Its
In each channel operation amplifier forward direction terminate same signal, which generates the output of unit U1 from reference voltage shown in Fig. 3
Current reference signal Vref；The source and the one end sampling resistor Rsen_x of operational amplifier negative phase end and adjustment pipe NM_x connect
It is connected together, resistance other end ground connection；The drain terminal of adjustment pipe NM_x is connected with one end of output loading.
The adjustment pipe NM_x drain terminal voltage signal Vdr_x that each channel current adjusts circuit had both connected one end of load, simultaneously
It is connected to channel selection unit U3 to detect the pressure drop at the connect equivalent load impedance both ends in each channel, and selects maximum negative
The lower terminal voltage for carrying channel feeds back to switch power converter U4, with reference to the connection of Fig. 3 channel selection unit U3, is selected
Signal Vdr_x characterizes the lower terminal voltage of maximum load, when being also able to reflect output voltage information under stable state, when output voltage makes this
When the Vdr_x in channel meets the needs of corresponding channel current regulation unit, the current regulation function in other channels can equally be expired
Foot, and then improve system effectiveness.
The above-mentioned described drain terminal voltage detecting for exchanging homogeneous tube NM_x is not limited solely to the selection in maximum load channel and
It realizes, other detections adjustment pipe NM_x operating characteristics, realizes the methods of similar functions also within scope of the claims.
In Fig. 1 Switching Power Supply conversion converter U4 by receive maximum load channel lower terminal voltage Vdr_x signal and
The reference signal of output voltage, reference and external setting-up by output voltage stabilization to required voltage value, due to output voltage
Output current information it is related, it had both been able to satisfy the driving current in maximum load channel, while avoiding output voltage is excessively high from causing
System effectiveness is excessively lost.
Include one illustrative embodiment of internal circuit of switch power converter U4 in Fig. 3, is switched in the example
Power adapter has been configured to the mode of synchronous buck, and designer in use can be according to the feelings of input and output voltage
Condition uses the Switching Power Supply of different topology structure.And details necessary to illustrate this explanation is shown only in the example,
In include error amplifier U41 and correlation RC compensation network, duty cycle adjustment unit U42, power tube gate drivers U43, by
Output stage driver, output inductor Lout and the output capacitor Cout of power tube PM31 and PM32 composition.By channel selecting
The maximum load channel voltage signal Vdr_x (x is corresponding channel) and output voltage reference signal that Unit selection goes out are put by error
Big device receives, and generates the control signal of duty cycle adjustment, while R1, C1, C2 and error amplifier U41 are configured to PI compensation together
Network realizes that loop stability compensation, the output of error amplifier U41 are completed via duty cycle adjustment device U42 to duty cycle signals
Adjustment, power tube drive element of the grid U43 receives duty cycle signals adjusted and simultaneously drives output stage driver, by PM31,
NM31 constitute output stage driver and outputting inductance Lout and output capacitance Cout under the control of duty cycle signals, complete from
Energy transfer of the input voltage VIN to output voltage VO UT, voltage needed for exporting maximum load.
It is referred to according to the reasonable setting output voltage of application, system effectiveness can be directly affected.Excessively high output voltage meeting
Efficiency is reduced, it is too low to bring challenges to the design of output current adjustment unit, or even influence output driving current.It is experienced
Designer the reference of suitable output voltage can be set, largely according to the working condition of output current regulation unit
Improve entire drive efficiency.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, all former in design of the invention
Then, within technical solution, any modification, equivalent substitution, improvement and etc. done are all contained in the scope of the present invention.
Claims (10)
1. a kind of current driver of high efficiency multichannel, which is characterized in that the current driver mainly includes reference voltage
Unit, output current regulation unit, channel selection unit, switch power converter unit are generated, reference voltage generates unit
Input signal is accessed by outside, generates the reference signal of current driver output electric current and output voltage, and reference voltage generates
The output of unit is separately connected switch power converter unit and output current regulation unit, and output current regulation unit connects respectively
Connect one end of each channel external loading, while interface channel selecting unit, channel selection unit is by each channel external loading information
Reference voltage is fed back to after screening and generates unit, and the output of switch power converter is connected to other the one of each channel external loading
End；Wherein:
The reference voltage generates unit by the processing to external information, generates the reference letter of output electric current and output voltage
Number, determine the output electric current and output voltage of current driver；
The output current regulation unit includes the current regulating circuit of single channel or multi-channel, and current regulating circuit passes through output
Current reference signal and operational amplifier, the components such as current sampling resistor make output load current be in constant current in the steady state
Mode, the current value of output loading are approximately equal to the reference voltage of output electric current divided by sampling resistor；
The channel selection unit selects load largest passages by adjusting pipe drain terminal voltage detecting to current regulating circuit
Lower terminal voltage is output voltage sample information and feeds back to switch power converter；
The switch power converter is by the sampling to maximum external loading lower terminal voltage, by output voltage stabilization to required
The output current information of voltage value, output voltage values and external setting-up is related, and then output voltage increases for output loading increase, output
Then output voltage reduces load reduction, and the current-limiting function for being both able to satisfy maximum load channel in this way is normal, while being unlikely to export
Overtension brings the excessive loss of efficiency.
2. current driver according to claim 1, which is characterized in that the reference voltage generates unit, determines output
The reference signal of electric current is generated by the driving current information of external demand by processing；Determine the reference signal of output voltage by defeated
The reference signal of electric current is superimposed a voltage and generates out, and institute's superimposed voltage is not only limited to fixed voltage, is also possible to and exports
The relevant voltage value of electric current.
3. current driver according to claim 1, which is characterized in that the output current regulation unit includes one
Or the current regulating circuit in multiple channels, every channel current adjust circuit mainly by operational amplifier, output adjustment pipe NM_x (x
For corresponding channel), output current sampling resistor Rsen_x (x be corresponding channel) three parts constitute；Wherein each channel operation
Amplifier forward end is all connected with same signal, i.e. reference voltage generates the output current reference signal that unit generates；Operation amplifier
The source and output one end current sampling resistor Rsen_x of device negative phase end and adjustment pipe NM_x link together, and export current sample
Resistance Rsen_x other end ground connection；The drain terminal of adjustment pipe NM_x is connected with one end of output loading.
4. according to claim 1 with current driver described in 3 it is further characterized in that, each channel of the current regulating circuit
Output current sampling resistor Rsen_x resistance value is equal and keep matching, and the adjustment pipe NM_x in each channel is equal sized and keeps
Match, the operation amplifier circuit in each channel is identical.
5. according to claim 1 with current driver described in 4, it is further characterized in that, the current regulating circuit controls electric current
The output electric current in each channel in driver, under the stable state that works, output current value is by output current reference signal and output electric current
Sampling resistor Rsen_x is determined, is approximately equal to the voltage of output current reference signal and is exported the ratio of current sampling resistor Rsen_x
Value.
6. current driver according to claim 1, which is characterized in that the channel selection unit is by maximum load channel
It selects, and the lower terminal voltage of the channel load is fed back into the switch power converter unit, participate in output voltage
Control.
7. according to claim 1 with current driver described in 6, which is characterized in that the channel selection unit, maximum load
The method of channel selecting is that the drain terminal voltage by the adjustment pipe NM_x in channel each in the current regulation unit detects,
Maximum load channel is selected, and the lower terminal voltage of the corresponding load in the channel is fed back into the switch power converter unit.
8. according to claim 1 with 7 current drivers, which is characterized in that the channel selection unit, the realization of function
Mode is not limited only to detect the drain terminal voltage of each channel adjustment pipe NM_x, other such as detect NM_x working condition or size of current
In realizing that the mode of similar functions is all contained in.
9. current driver according to claim 1, which is characterized in that the switch power converter unit includes:
Error amplifier, duty cycle adjustment device, power tube gate driving circuit, output stage driver and outputting inductance capacitor；Wherein:
The error amplifier circuit, circuit feature, which is to amplify, generates output voltage caused by unit as reference voltage
Reference signal and by channel selection unit feedback maximum load channel low side low pressure difference, when the maximum load detected
Lower terminal voltage be higher than reference voltage generate unit output voltage reference signal when, error amplifier output reduce, work as detection
When the lower terminal voltage of the maximum load arrived generates the output voltage reference of unit lower than reference voltage, error amplifier output is risen
It is high.The partial circuit undertakes the function of loop compensation simultaneously, and purpose makes output voltage stabilization；
The duty cycle adjustment device receives the output voltage signal of error amplifier and generates the pulse letter of controlled duty cycle
Number, the duty ratio of output signal keeps same phase with the output voltage of error amplifier, and output voltage error amplifier is increased, accounted for
Sky increases than the output signal duty ratio of adjuster, conversely, output voltage error amplifier reduces, duty cycle adjustment device output letter
Number duty ratio reduce；
The power tube gate driving circuit, circuit feature are to connect the output signal of duty cycle adjustment device, handle and be somebody's turn to do
Signal becomes two paths of signals, increases the driving capability of duty cycle adjustment device output signal, respectively drives output stage drive circuit
PM31 and NM31；
The output stage drive circuit, circuit feature are to be made of PM31 and NM31, connection power tube gate driving electricity
The current path to charge from input voltage to output inductor is realized in the output on road；
The output inductor is connected between the output and output voltage of output stage driver, switching voltage signal is converted
At current signal；
The output capacitor, is connected between output voltage and ground.
10. current driver according to claim 1, which is characterized in that the switch power converter unit, by referring to
The maximum load information that the output voltage reference signal and channel selection unit that voltage generating unit generates are selected is via error
After amplifier, output signal regulating switch power supply duty ratio；Its feature two is that electricity will be inputted by the adjusting of duty cycle signals
The output voltage of conversion cost invention is pressed, and is connected to one end of each channel external loading.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910334607.6A CN110198581A (en) | 2019-04-24 | 2019-04-24 | A kind of current driver of high efficiency multichannel |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910334607.6A CN110198581A (en) | 2019-04-24 | 2019-04-24 | A kind of current driver of high efficiency multichannel |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113271008A (en) * | 2021-04-15 | 2021-08-17 | 合肥工业大学 | Multi-channel fast response inductive load controllable current driving device |
| CN113708728A (en) * | 2021-10-21 | 2021-11-26 | 常州欣盛半导体技术股份有限公司 | Channel operational amplifier circuit capable of automatically reducing steady-state current |
| CN113783408A (en) * | 2021-09-17 | 2021-12-10 | 合肥美的电冰箱有限公司 | Power module control method and device, power equipment, electric appliance and storage medium |
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| CN113271008A (en) * | 2021-04-15 | 2021-08-17 | 合肥工业大学 | Multi-channel fast response inductive load controllable current driving device |
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| CN113783408A (en) * | 2021-09-17 | 2021-12-10 | 合肥美的电冰箱有限公司 | Power module control method and device, power equipment, electric appliance and storage medium |
| CN113708728A (en) * | 2021-10-21 | 2021-11-26 | 常州欣盛半导体技术股份有限公司 | Channel operational amplifier circuit capable of automatically reducing steady-state current |
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