CN109152158A - A kind of constant pressure that can adapt to output and input variation automatically turns constant-current drive circuit - Google Patents
A kind of constant pressure that can adapt to output and input variation automatically turns constant-current drive circuit Download PDFInfo
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Abstract
The present invention discloses a kind of constant pressure that can adapt to output and input variation automatically and turns constant-current drive circuit, including constant voltage circuit, signal feedback circuit and constant-current circuit；The constant voltage circuit, signal feedback circuit and constant-current circuit are using total topological structure on the spot；The signal feedback circuit acquires and handles the bus of constant-current circuit and the pressure difference signal of load, then exports to constant voltage circuit, constant voltage circuit could be adjusted to the work of matching constant-current circuit to the busbar voltage of output.The innovation of the invention consists in that being cooperated by constant voltage circuit, signal feedback circuit, current regulating circuit, dynamic adjusts in real time, regardless of how input voltage and output loading voltage change, allow power consumption and constant current to be in steady state, safeguards system is in highest efficiency and working condition always always.
Description
Technical field
The invention belongs to LED power driving, all kinds of constant pressures to turn constant-current circuit technical field, and in particular to a kind of to fit automatically
The constant pressure that variation should be output and input turns constant-current drive circuit.
Background technique
It is higher and higher to the cost, efficiency and stability requirement of LED driving with the high speed development of LED illumination；Linearly
Constant current driving is congenital just to have the advantages such as Ultra Low Cost, more light-modulating modes, multichannel output, few peripheral components, therefore deep
By the favor in market, but be also accompanied by simultaneously it is some be difficult to solve the problems, such as, such as cannot realize simultaneously high PFC without stroboscopic, cannot
Meet the defects of low THD is required, is excessively poor to the adaptation range of input voltage and output voltage, overall efficiency is uncontrollable allow people again
Love is hated again, and concrete condition existing for these defects is exemplified below:
1, the case where when input voltage changes；It is 200Vac output loading 250V as reference to set input medium voltage,
As the every raising 10V of input voltage, this will all generate loss of the corresponding every 10V for 4% or so, and input voltage is increased to 240V,
The loss that additional will generate 16% or so additional will generate 24% or more loss, input electricity when input voltage is increased to 260V
High corresponding loss of continuing rising is pressed to continue to increase.Very big challenge will be all brought to entire circuit per increased loss and will not be known
Factor.Otherwise input voltage is lower than 200V, therefore linear constant current architectural mechanisms cause to have will be unable to because input voltage persistently reduces
Full conducting LED load, appearance output LED current is smaller and smaller to be entered non-constant current state and causes lamp dimmed.
2, the case where when output voltage changes；To set input 200Vac output loading 250V voltage as reference, because at present
Most LED lamp beads cause the every reduction 10V of output voltage that will produce because of temperature raising VF reduction or LED lamp bead VF disunity on the market
Raw corresponding 4% or so loss, for output voltage the 220V the case where, loss will additionally generate 12%；Otherwise lamp bead constant temperature
When being lower, output voltage is persistently got higher on the basis of 250V, therefore linear constant current architectural mechanisms lead to not fully on LED and bear
It carries, also will appear the output LED current non-constant current state of smaller and smaller entrance and cause lamp dimmed.
3, due to the structure feature of linear constant current, single segment structure or multi-segment structure are either used, is being realized without stroboscopic
When function, it cannot guarantee PFC and total current harmonic requirement；When realizing high PFC or low THD, and it cannot be guaranteed without stroboscopic.If
To meet these requirements simultaneously, that has to increase a voltage conversion circuit, the alternating current of front become one it is constant
The problem of direct current is given to linear constant current circuit again, in this way can be with effective solution input voltage range, PFC, THD, but for
For output loading range, this problem is fundamentally resolved not yet again without solution, that final efficiency.
Summary of the invention
In order to solve the above problems existing in the present technology, it is an object of that present invention to provide it is a kind of can adapt to automatically input and
The constant pressure of output variation turns constant-current drive circuit.The present invention is solved perfectly input voltage and output loading range cann't be solved
Problem, with Ultra Low Cost, simple and reliable, functions expanding is abundant, the unrestricted topological structure of power realizes above-mentioned purpose.
The technical scheme adopted by the invention is as follows:
A kind of constant pressure that can adapt to output and input variation automatically turns constant-current drive circuit, including constant voltage circuit, signal are anti-
Current feed circuit and constant-current circuit；
The constant voltage circuit, signal feedback circuit and constant-current circuit are using total topological structure on the spot；
The signal feedback circuit acquires and handles the bus of constant-current circuit and the pressure difference signal of load, then exports to perseverance
Volt circuit, constant voltage circuit could be adjusted to the work of matching constant-current circuit to the busbar voltage of output.
Preferably, the constant voltage circuit includes the constant pressure module connecting with positive polarity and cathode, is parallel to constant pressure mould
First resistor R1 and second resistance R2 between the voltage output end and ground of block, constant pressure module are equipped with output voltage and adjust pin,
Output voltage adjustment pin is connected to the node VSNC between first resistor R1 and second resistance R2；
The load connect the voltage output end of constant pressure module with one end after constant-current circuit series connection and the other end is grounded, signal
Node and signal output end between the sampling end connection load of feed circuit and constant-current circuit are connected to first resistor R1 and the
Node VSNC between two resistance R2；
The signal feedback circuit is responsible for sampling the bus of constant-current circuit and the pressure difference signal of load, then will setting
Pressure difference signal be output to node VCNS carry out Signal averaging, then export to constant voltage circuit output voltage adjust pin.
Preferably, the driving circuit is multi-channel driving circuit, multi-channel driving circuit includes constant voltage circuit and more
A channel, each channel include concatenated load and constant-current circuit, and the node between concatenated load and constant-current circuit passes through one
A signal feedback circuit is connected to the node VSNC between first resistor R1 and second resistance R2.
Preferably, the Signal averaging mechanism function of the multi-channel driving circuit are as follows: VSNC=V (R2)+V1+V2
+ ... Vn, V (R2) they are constant voltage circuit original output voltage sampled signal, and V1 is the bus in channel 1 and the pressure difference signal of load, V2
For the bus in channel 2 and the pressure difference signal of load, Vn is the bus of channel n and the pressure difference signal of load.
Preferably, the constant-current circuit includes the first metal-oxide-semiconductor of drain electrode with load connection, output end and the first metal-oxide-semiconductor
First operational amplifier of connection, the inverting input terminal of the first operational amplifier are grounded by constant current resistance RS, and the first operation is put
The normal phase input end of big device is connect with external control signal VREF, and the source electrode of the first metal-oxide-semiconductor is grounded also by constant current resistance RS.
Preferably, the signal feedback circuit includes signal sampling module, signal processing module and signal output module；
The signal sampling module is responsible for sampling bus and the pressure difference signal of load；
The signal processing module handles the pressure difference signal of the bus of acquisition and load；
The pressure difference signal biography of setting is output to node VCNS and carries out Signal averaging by the signal output module, is then exported
Output voltage to constant voltage circuit adjusts pin.
Preferably, the signal feedback circuit includes one end connection sampling end and the third electricity of other end ground connection after series connection
R3 and the 4th resistance R4 is hindered, the first capacitor C1 and first zener diode ZD1 in parallel with the 4th resistance R4 after in parallel, and string
One or two pole of node and other end connection signal output end after connection between one end connection 3rd resistor R3 and the 4th resistance R4
Pipe D1 and the 5th resistance R5.
Preferably, the signal feedback circuit include it is in sequential series after one end connection sampling end and other end ground connection the
Six resistance R6, the second diode D2 and the second optical coupler U1-2, one end connect between the 6th resistance R6 and the second diode D2
Node and the second capacitor C2, rear one end connection VDD in sequential series of other end ground connection and the first optical coupler U1- of other end ground connection
1, the node and the other end between the 7th resistance R7 and third capacitor C3 and one end connection the 7th resistance R7 and third capacitor C3
The third diode D3 of connection signal output end.
Preferably, the signal feedback circuit includes that output end is connect by the 4th diode D4 with signal output end
Second operational amplifier, one end connect the 8th resistance of the normal phase input end of second operational amplifier and other end connection sampling end
R8, the 9th resistance R9 and the second pressure stabilizing of the normal phase input end of one end connection second operational amplifier and other end ground connection after parallel connection
Diode ZD2, one end connect the anti-phase input of the output end of second operational amplifier and other end connection second operational amplifier
The tenth resistance R10 at end, the fourth capacitor C4 in parallel with the tenth resistance R10 and one end connect the anti-of second operational amplifier
The eleventh resistor R11 of control signal VREF outside phase input terminal and other end connection.
Preferably, the signal feedback circuit includes one end connection sampling end and the other end are grounded after connecting the 12
Resistance R12 and thirteenth resistor R13, signal input part connect the node between twelfth resistor R12 and thirteenth resistor R13
MCU, the signal output end of rear one end connection MCU in sequential series and the 5th diode D5, the 14th resistance R14 of other end ground connection
With the node after the 5th capacitor C5, and series connection between one end connection the 14th resistance R14 and the 5th capacitor C5 and the other end connects
Meet the 15th resistance R15 and the 6th diode D6 of the signal output end of signal feedback circuit.
The invention has the benefit that
1, real the innovation of the invention consists in that being cooperated by constant voltage circuit, signal feedback circuit, current regulating circuit
When dynamic adjust, regardless of how input voltage and output loading voltage change, power consumption and constant current is allowed be in steady state always, guarantor
Barrier system is in highest efficiency and working condition always.
2, signal feedback circuit of the invention dexterously samples bus and the pressure difference of load very much, then by setting
The node VCNS that pressure difference signal is given to constant voltage circuit part carries out Signal averaging and adjusts busbar voltage, to guarantee bus and bear
The constant of pressure difference is carried, can guarantee the high-efficiency operation of system well.
3, the present invention bus ceiling voltage is also limited by node VCNS divider resistance, allow system power loop always
In safely controllable range.
4, the present invention sets the pressure difference of bus and load by circuit parameter, proof load can be in reason always well
The constant current state thought can reach extraordinary no strobe effect if it is LED load.
5, the present invention can flexibly realize the types of applications in the channel n+1, such as: single channel light modulation, Double-way light regulating color-temperature regulating, RGB
Three tunnels dim color-temperature regulating, the various intelligent dimming modes such as the light modulation of tetra- tunnel RGBW and the light modulation toning of the road two-way+RGB5, circuit structure
Succinctly, flexibly.
6, the voltage range of input and output of the present invention is wide, and the input of 85-305V ultra-wide alternating voltage may be implemented, be less than 500V
Load output, effective over various application occasions.
7, present invention band load current capacity is big, and power density is big, and circuit is small in size, under identical system bulk, than passing
The power of system is twice above, and the types of applications in 400W may be implemented, and is particularly suitable for some ultra-small volumes, powerful answers
With.
8, constant voltage circuit part of the invention usually has boosting, buck or the triple modes of decompression and isolation, non-isolated
Equal topological structures, to meet different output loading requirements, while high performance requirements may be implemented: the PFC of superelevation (is greater than
0.97) it is all kinds of to can satisfy the whole world for, ultralow THD (total current harmonic wave is less than 10%), ultrafast input voltage dynamic adjustment capability
Harsh authentication requesting.
Detailed description of the invention
Fig. 1 is the electrical block diagram of the present invention-embodiment 2.
Fig. 2 is the electrical block diagram of the present invention-embodiment 3.
Fig. 3 is the first electrical block diagram of 6 signal feedback circuit of the present invention-embodiment.
Fig. 4 is second of electrical block diagram of 7 signal feedback circuit of the present invention-embodiment.
Fig. 5 is the third electrical block diagram of 8 signal feedback circuit of the present invention-embodiment.
Fig. 6 is the 4th kind of electrical block diagram of 9 signal feedback circuit of the present invention-embodiment.
Fig. 7 is a kind of electrical block diagram of booster circuit of 10 constant voltage circuit of the present invention-embodiment.
Specific embodiment
With reference to the accompanying drawing and specific embodiment the present invention is further elaborated.
Embodiment 1:
A kind of constant pressure that can adapt to output and input variation automatically of the present embodiment turns constant-current drive circuit, including constant pressure electricity
Road, signal feedback circuit and constant-current circuit.
Constant voltage circuit, signal feedback circuit and constant-current circuit using topological structure on the spot altogether, be conducive to system control and
Stablize, EMC interference is effectively reduced.
The logic control relation of driving circuit belongs to closed-loop control: signal feedback circuit acquires and handles the mother of constant-current circuit
Then the pressure difference signal of line and load is exported to constant voltage circuit, constant voltage circuit could be adjusted to match to the busbar voltage of output
The work of constant-current circuit.
Embodiment 2:
As shown in Figure 1, a kind of constant pressure that can adapt to output and input variation automatically of the present embodiment turns constant-current drive circuit,
Including constant voltage circuit, signal feedback circuit and constant-current circuit, on the basis of embodiment 1, constant voltage circuit, signal feedback circuit and
The specific connection structure of constant-current circuit are as follows:
Constant voltage circuit includes the constant pressure module connecting with positive polarity and cathode, the voltage output end for being parallel to constant pressure module
First resistor R1 and second resistance R2 between ground, constant pressure module are equipped with output voltage and adjust pin, which is connected to the
Node VSNC between one resistance R1 and second resistance R2；
Load voltage output end and the other end ground connection that constant pressure module is connect with one end after constant-current circuit series connection, signal feedback
Node and signal output end between the sampling end connection load of circuit and constant-current circuit are connected to the electricity of first resistor R1 and second
Hinder the node VSNC between R2.
The logic closed loop control process of above-mentioned driving circuit are as follows:
Signal feedback circuit samples constant-current circuit, is handled and exported, and signal feedback circuit is the core of entire loop
Center portion point, signal feedback circuit are responsible for sampling the bus of constant-current circuit and the pressure difference signal of load, then by the pressure of setting
Difference signal is output to node VCNS and carries out Signal averaging, then exports to the output voltage of constant voltage circuit and adjusts pin, constant pressure electricity
Road could be adjusted to the work of matching constant-current circuit to the busbar voltage of output；
Output voltage adjusts pin in no constant-current circuit feedback signal, and the output voltage of constant voltage circuit is only by the first electricity
The ratio for hindering R1 and second resistance R2 determines；When there is constant-current circuit feedback signal, the pressure difference signal and first of bus and load
Signal at the intermediate node VSNC of resistance R1 and second resistance R2 is overlapped (analog signal superposition), the output electricity of constant voltage circuit
Pressure is no longer determined that therefore, the operation of constant-current circuit can directly affect mother by the ratio of first resistor R1 and second resistance R2
The size of line voltage can very well realize that the pressure difference of bus and load keeps a steady state value at this time, guarantee system
High-efficiency operation.
In addition, divider resistance, that is, first resistor R1 effect of output voltage adjustment pin is the bus highest electricity of limitation
Pressure, allows the power loop of system to be in safely controllable range always.
Embodiment 3:
As shown in Fig. 2, a kind of constant pressure that can adapt to output and input variation automatically of the present embodiment turns constant-current drive circuit,
Including constant voltage circuit and multiple signal feedback circuits and constant-current circuit, on the basis of embodiment 2, multiple channels in parallel, often
A channel includes concatenated load and constant-current circuit, and the node between concatenated load and constant-current circuit is fed back by a signal
Circuit connection is to the node VSNC between first resistor R1 and second resistance R2.
The present embodiment realizes the application of multichannel, and either 2 channels or N number of channel, the signal of each paths is anti-
Current feed circuit can all be overlapped the node VSNC that respective pressure difference signal is fed back between first resistor R1 and second resistance R2
Processing, as long as there is the signal of any paths to change, the adjustment that constant voltage circuit can be made to respond.
Embodiment 4:
A kind of constant pressure that can adapt to output and input variation automatically of the present embodiment turns constant-current drive circuit, in embodiment 3
On the basis of, the present embodiment illustrates the Signal averaging mechanism of multichannel.
Mechanism function is that VSNC=V (R2)+V1+V2+ ... Vn, V (R2) are constant voltage circuit original output voltage sampled signal,
V1 is the bus in channel 1 and the pressure difference signal of load, and V2 is the bus in channel 2 and the pressure difference signal of load, and Vn is the mother of channel n
The pressure difference signal of line and load.
Since the output voltage sampling node voltage of constant voltage circuit is constant, so can reflect out it from above-mentioned formula
Superposition processing relationship:
The pressure difference signal that certain channel provides is bigger, and bus adjustment is just based on the channel.Above-mentioned superposition processing relationship is to negative
It carries voltage adaptive and multichannel application brings great expansion, this is also a core of the patented technology.
For some defects that linear constant current scheme at present on the market is faced, the present invention through the foregoing embodiment 1,2,
3 or 4 have carried out comprehensive improvement, first the circuit can be directed to different input voltages, such as 85-305Vac alternating current or
Direct current boosts to 450Vac by constant voltage circuit, and perhaps lifting is pressed onto 200V or is only depressured to 50V；It is born for different
Carry voltage, such as 450V, 200V, 50V, under these voltage conditions can Auto-matching busbar voltage, so that bus and load is begun
The pressure difference of a design requirement is kept eventually, this constant pressure difference can pass through the letter of signal feedback circuit according to requirements
Number sampling module is freely arranged, such as constant 10V, 20V etc., and this pressure difference is exactly loss in efficiency part, this pressure difference is smaller, is
The efficiency of system will be higher；For example pressure differential resetting is 10V, load current 200mA, then the power invariability lost at this time is
0.4W no longer changes with input voltage and load voltage and is changed, thus the energy consumption of loss by signal feedback circuit come
It keeps a firm hand on, greatly reduces the temperature of related elements and complete machine, improve the stability and service life of complete machine, opposite two
Grade Switching Power Supply or single- stage PFC+go for stroboscopic circuit, volume and cost all further decrease.
Embodiment 5:
A kind of constant pressure that can adapt to output and input variation automatically of the present embodiment turns constant-current drive circuit, in embodiment 2
On the basis of, the signal feedback circuit of the present embodiment includes: signal sampling module, signal processing module and signal output module；
Signal sampling module is responsible for sampling bus and the pressure difference signal of load, and signal processing module is by the mother of acquisition
Line and the pressure difference signal of load are handled, and the pressure difference signal biography of setting is output to node VCNS and carries out letter by signal output module
Number superposition, then export to constant voltage circuit output voltage adjust pin.
Constant voltage circuit could be adjusted to the work of matching constant-current circuit to the busbar voltage of output.
Embodiment 6:
As shown in figure 3, a kind of constant pressure that can adapt to output and input variation automatically of the present embodiment turns constant-current drive circuit,
On the basis of embodiment 5, the present embodiment distance illustrates the first circuit structure of signal feedback circuit.
Signal feedback circuit includes one end connection sampling end and the electricity of 3rd resistor R3 and the 4th of other end ground connection after series connection
R4 is hindered, one end connects after the first capacitor C1 and the first zener diode ZD1 in parallel with the 4th resistance R4, and series connection after in parallel
Node and the first diode D1 of other end connection signal output end and the 5th electricity between 3rd resistor R3 and the 4th resistance R4
Hinder R5.
Above-mentioned signal feedback circuit is the form of most direct analog signal sampling and output, the electricity of 3rd resistor R3 and the 4th
Resistance R4 carries out partial pressure current limliting processing to signal, and the pressure difference signal of different voltages value is acquired according to different parameters setting, and first is steady
Pressure diode ZD1 does a clamper to the pressure difference signal of acquisition, and first capacitor C1 does an integral smooth processing to pressure difference signal,
4th resistance R4 is further continued for current limliting voltage division processing to pressure difference signal, and first diode D1 prevents the voltage signal of VSNC from reversely flowing into
Signal feedback circuit guarantees that the signal flow of signal feedback circuit keeps one-way, and is unlikely to upset the voltage signal of VSNC
With the normal work of signal feedback circuit.
Embodiment 7:
As shown in figure 4, a kind of constant pressure that can adapt to output and input variation automatically of the present embodiment turns constant-current drive circuit,
On the basis of embodiment 5, the present embodiment distance illustrates second of circuit structure of signal feedback circuit.
Signal feedback circuit includes rear one end connection sampling end in sequential series and the 6th resistance R6 of other end ground connection, second
Diode D2 and the second optical coupler U1-2, one end connect the node between the 6th resistance R6 and the second diode D2 and another termination
The second capacitor C2 on ground, it is in sequential series after one end connection VDD and the first optical coupler U1-1, the 7th resistance R7 of other end ground connection and
Node and other end connection signal output end between third capacitor C3 and one end connection the 7th resistance R7 and third capacitor C3
Third diode D3.
The pressure difference signal of sampling end is isolated as far as possible by optocoupler and is transmitted to above-mentioned signal feedback circuit, and the 6th R6 pairs of resistance
Pressure difference signal carries out current limliting and partial pressure, and the size of current of optical coupler is adjusted by adjusting the resistance sizes of the 6th resistance R6, the
Two capacitor C2 are signal filtering, also the speed of the capacitance size adjustment dynamic responding speed of adjustable second capacitor C2, second
Diode D2 mainly provides a constant voltage, and the first optical coupler U1-1 and the second optical coupler U1-2 are while transmitting signal
Carry out electrical isolation, the 7th resistance R7 and third capacitor C3 divide the signal that optical coupler is sent again, current limliting and filtering
Smoothing processing, then the property unidirectional by third diode D3, fully transmission is gone over.
Embodiment 8:
As shown in figure 5, a kind of constant pressure that can adapt to output and input variation automatically of the present embodiment turns constant-current drive circuit,
On the basis of embodiment 5, the present embodiment distance illustrates the third circuit structure of signal feedback circuit.
Signal feedback circuit includes that output end passes through the second operation amplifier that the 4th diode D4 is connect with signal output end
Device, one end connects the 8th resistance R8 of the normal phase input end of second operational amplifier and other end connection sampling end, in parallel latter
The normal phase input end of end connection second operational amplifier and the 9th resistance R9 and the second zener diode ZD2 of other end ground connection,
One end connects the tenth electricity of the output end of second operational amplifier and the inverting input terminal of other end connection second operational amplifier
Hinder R10, the fourth capacitor C4 in parallel with the tenth resistance R10 and one end connect the inverting input terminal of second operational amplifier and
The eleventh resistor R11 of control signal VREF outside other end connection.
Above-mentioned signal feedback circuit carries out signal sampling and processing by amplifier, can effectively reduce signal sampling module pair
The influence of end signal is sampled, while also preferably influence of the isolation sampling end to output end signal.The electricity of 8th resistance R8 and the 9th
Resistance R9 carries out partial pressure adjustment to signal；Second zener diode ZD2 carries out the bypass of clamper and negative-going signal, the 4th electricity to signal
Appearance C4 is integrating capacitor, is responsible for that signal smoothing is filtered, and the tenth resistance R10, eleventh resistor R11 and VREF are with reference to electricity
Pressure and magnification ratio adjustment, the amplification factor of adjustment signal；4th diode D4 prevents the voltage signal of VSNC from reversely flowing into fortune
It puts, and is unlikely to upset VSNC signal.
Embodiment 9:
As shown in fig. 6, a kind of constant pressure that can adapt to output and input variation automatically of the present embodiment turns constant-current drive circuit,
On the basis of embodiment 5, the present embodiment distance illustrates the 4th kind of circuit structure of signal feedback circuit.
Signal feedback circuit includes one end connection sampling end and the twelfth resistor R12 and the tenth of other end ground connection after series connection
Three resistance R13, signal input part connects the MCU of the node between twelfth resistor R12 and thirteenth resistor R13, in sequential series
The signal output end of one end connection MCU and the 5th diode D5, the 14th resistance R14 and the 5th capacitor of other end ground connection afterwards
Node and other end connection signal after C5, and series connection between one end connection the 14th resistance R14 and the 5th capacitor C5 are fed back
15th resistance R15 of the signal output end of circuit and the 6th diode D6.
Above-mentioned MCU uses MDT10F272.
Above-mentioned signal feedback circuit is realized by single-chip microprocessor MCU；MCU, which samples analog signal and handles, to be transformed into
Then high-precision digital signal provides corresponding PWM value, the 5th diode D5, the 14th by internal logic operation again
This pwm signal is converted to analog signal again by the integrating circuit of resistance R14 and the 5th capacitor C5 composition, because VSNC can only be to mould
Quasi- signal is effective；Also preferably influence of the isolation sampling end to signal output end signal in this way, while MCU carries out multiplicity to signal
Logic analysis and processing, expand application range significantly, twelfth resistor R12 and thirteenth resistor R13 divide signal
Pressure adjustment, the 5th diode D5 effect are to guarantee the signal uniline conducting of MCU output, guarantee the integrality of output signal, the tenth
Four resistance R14 and the 5th capacitor C5 are integral smooth circuit, and digital signal is then converted into analog signal；15 resistance R15 are
Current limliting divides adjustment circuit, and the 6th diode D6 is the voltage signal reverse flow for preventing VSNC, and is unlikely to upset VSNC letter
Number.
Embodiment 10:
As shown in fig. 7, a kind of constant pressure that can adapt to output and input variation automatically of the present embodiment turns constant-current drive circuit,
On the basis of embodiment 9, the present embodiment illustrates a kind of boost circuit structure of constant voltage circuit.
The PWM value of signal feedback circuit output is input to constant voltage circuit from DRNA node to change busbar voltage.
Embodiment 11:
A kind of constant pressure that can adapt to output and input variation automatically of the present embodiment turns constant-current drive circuit, in embodiment 2
On the basis of, the present embodiment illustrates a kind of circuit structure of constant-current circuit.
Constant-current circuit includes the first metal-oxide-semiconductor of drain electrode with load connection, the first operation that output end is connect with the first metal-oxide-semiconductor
The inverting input terminal of amplifier, the first operational amplifier is grounded by constant current resistance RS, the positive input of the first operational amplifier
It holds and is connect with external control signal VREF, the source electrode of the first metal-oxide-semiconductor is grounded also by constant current resistance RS.
The present invention is not limited to above-mentioned optional embodiment, anyone can show that other are various under the inspiration of the present invention
The product of form, however, make any variation in its shape or structure, it is all to fall into the claims in the present invention confining spectrum
Technical solution, be within the scope of the present invention.
Claims (10)
1. a kind of constant pressure that can adapt to output and input variation automatically turns constant-current drive circuit, it is characterised in that: including constant pressure electricity
Road, signal feedback circuit and constant-current circuit；
The constant voltage circuit, signal feedback circuit and constant-current circuit are using total topological structure on the spot；
The signal feedback circuit acquires and handles the bus of constant-current circuit and the pressure difference signal of load, then exports to constant pressure electricity
Road, constant voltage circuit could be adjusted to the work of matching constant-current circuit to the busbar voltage of output.
2. a kind of constant pressure that can adapt to output and input variation automatically according to claim 1 turns constant-current drive circuit,
Be characterized in that: the constant voltage circuit includes the constant pressure module connecting with positive polarity and cathode, the voltage for being parallel to constant pressure module
First resistor R1 and second resistance R2 between output end and ground, constant pressure module are equipped with output voltage and adjust pin, output voltage
Adjustment pin is connected to the node VSNC between first resistor R1 and second resistance R2；
The load connect the voltage output end of constant pressure module with one end after constant-current circuit series connection and the other end is grounded, signal feedback
Node and signal output end between the sampling end connection load of circuit and constant-current circuit are connected to the electricity of first resistor R1 and second
Hinder the node VSNC between R2；
The signal feedback circuit is responsible for sampling the bus of constant-current circuit and the pressure difference signal of load, then by the pressure of setting
Difference signal is output to node VCNS and carries out Signal averaging, then exports to the output voltage of constant voltage circuit and adjusts pin.
3. a kind of constant pressure that can adapt to output and input variation automatically according to claim 2 turns constant-current drive circuit,
Be characterized in that: the driving circuit is multi-channel driving circuit, and multi-channel driving circuit includes constant voltage circuit and multiple channels, often
A channel includes concatenated load and constant-current circuit, and the node between concatenated load and constant-current circuit is fed back by a signal
Circuit connection is to the node VSNC between first resistor R1 and second resistance R2.
4. a kind of constant pressure that can adapt to output and input variation automatically according to claim 3 turns constant-current drive circuit,
It is characterized in that: the Signal averaging mechanism function of the multi-channel driving circuit are as follows: VSNC=V (R2)+V1+V2+ ... Vn, V
It (R2) is constant voltage circuit original output voltage sampled signal, V1 is the bus in channel 1 and the pressure difference signal of load, and V2 is channel 2
The pressure difference signal of bus and load, Vn are the bus of channel n and the pressure difference signal of load.
5. a kind of constant pressure that can adapt to output and input variation automatically according to claim 2 turns constant-current drive circuit,
Be characterized in that: the constant-current circuit includes the first metal-oxide-semiconductor of drain electrode with load connection, output end connect with the first metal-oxide-semiconductor the
The inverting input terminal of one operational amplifier, the first operational amplifier is grounded by constant current resistance RS, and the first operational amplifier is just
Phase input terminal is connect with external control signal VREF, and the source electrode of the first metal-oxide-semiconductor is grounded also by constant current resistance RS.
6. a kind of constant pressure that can adapt to output and input variation automatically according to claim 2 turns constant-current drive circuit,
Be characterized in that: the signal feedback circuit includes signal sampling module, signal processing module and signal output module；
The signal sampling module is responsible for sampling bus and the pressure difference signal of load；
The signal processing module handles the pressure difference signal of the bus of acquisition and load；
The pressure difference signal biography of setting is output to node VCNS and carries out Signal averaging by the signal output module, is then exported to perseverance
The output voltage of volt circuit adjusts pin.
7. a kind of constant pressure that can adapt to output and input variation automatically according to claim 6 turns constant-current drive circuit,
Be characterized in that: the signal feedback circuit includes one end connection sampling end and the 3rd resistor R3 and the of other end ground connection after series connection
Four resistance R4, one end after the first capacitor C1 and the first zener diode ZD1 in parallel with the 4th resistance R4, and series connection after in parallel
Connect the node between 3rd resistor R3 and the 4th resistance R4 and the first diode D1 of other end connection signal output end and the
Five resistance R5.
8. a kind of constant pressure that can adapt to output and input variation automatically according to claim 6 turns constant-current drive circuit,
Be characterized in that: the signal feedback circuit includes the 6th resistance of rear one end connection sampling end in sequential series and other end ground connection
R6, the second diode D2 and the second optical coupler U1-2, one end connect the 6th resistance R6 and the second diode D2 between node and
The second the capacitor C2, rear one end connection VDD in sequential series and the first optical coupler U1-1 of other end ground connection, the 7th of other end ground connection
Node and other end connection letter between resistance R7 and third capacitor C3 and one end connection the 7th resistance R7 and third capacitor C3
The third diode D3 of number output end.
9. a kind of constant pressure that can adapt to output and input variation automatically according to claim 6 turns constant-current drive circuit,
Be characterized in that: the signal feedback circuit includes that output end passes through the second operation that the 4th diode D4 is connect with signal output end
Amplifier, one end connects the 8th resistance R8 of the normal phase input end of second operational amplifier and other end connection sampling end, in parallel
The normal phase input end of one end connection second operational amplifier and the 9th resistance R9 and the second zener diode of other end ground connection afterwards
ZD2, one end connect the of the output end of second operational amplifier and the inverting input terminal of other end connection second operational amplifier
The anti-phase input of ten resistance R10, the fourth capacitor C4 in parallel with the tenth resistance R10 and one end connection second operational amplifier
The eleventh resistor R11 of control signal VREF outside end and other end connection.
10. a kind of constant pressure that can adapt to output and input variation automatically according to claim 6 turns constant-current drive circuit,
Be characterized in that: the signal feedback circuit includes one end connection sampling end and the twelfth resistor R12 of other end ground connection after series connection
With thirteenth resistor R13, signal input part connects the MCU of the node between twelfth resistor R12 and thirteenth resistor R13, suitable
The signal output end of one end connection MCU and the 5th diode D5, the 14th resistance R14 and the 5th of other end ground connection after secondary series connection
Node and other end connection signal after capacitor C5, and series connection between one end connection the 14th resistance R14 and the 5th capacitor C5
15th resistance R15 of the signal output end of feed circuit and the 6th diode D6.
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| CN201811326497.0A CN109152158B (en) | 2018-11-08 | 2018-11-08 | Constant voltage-to-constant current driving circuit capable of automatically adapting to input and output changes |
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| CN110231846A (en) * | 2019-06-10 | 2019-09-13 | 西安微电子技术研究所 | A kind of power module feedback control circuit difunctional with constant current and constant pressure |
| CN110312347A (en) * | 2019-08-02 | 2019-10-08 | 厦门亚锝电子科技有限公司 | A kind of constant current constant voltage LED drive circuit |
| CN111163564A (en) * | 2020-01-10 | 2020-05-15 | 东莞锐视光电科技有限公司 | Method for stably controlling current in light source |
| CN111629490A (en) * | 2020-07-07 | 2020-09-04 | 中科慧远视觉技术（洛阳）有限公司 | Current-adjustable and PWM (pulse-width modulation) strobe frequency controlled constant-current driving circuit and control method |
| CN113141693A (en) * | 2020-01-17 | 2021-07-20 | 深圳市明微电子股份有限公司 | Linear constant current control circuit and light source system |
| CN113286398A (en) * | 2021-05-31 | 2021-08-20 | 深圳市必易微电子股份有限公司 | Load driving circuit and driving method |
| CN115800746A (en) * | 2023-01-30 | 2023-03-14 | 海的电子科技(苏州)有限公司 | Hard feedback load voltage compensation circuit and method |
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| CN115800746A (en) * | 2023-01-30 | 2023-03-14 | 海的电子科技(苏州)有限公司 | Hard feedback load voltage compensation circuit and method |
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