CN106879118A - A kind of condensance balanced type multi-channel LED drive circuit - Google Patents
A kind of condensance balanced type multi-channel LED drive circuit Download PDFInfo
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- CN106879118A CN106879118A CN201710197919.8A CN201710197919A CN106879118A CN 106879118 A CN106879118 A CN 106879118A CN 201710197919 A CN201710197919 A CN 201710197919A CN 106879118 A CN106879118 A CN 106879118A
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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
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/10—Controlling the intensity of the light
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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Abstract
The present invention proposes a kind of condensance balanced type multi-channel LED drive circuit, including direct-current input power supplying, half bridge switching circuit, resonant inductance, resonant capacitance, shunt inductance, transformer, variable capacitance circuit, balancing capacitance module, LED string module, feedback control module and constant frequency control module.N LED string load is parallel-connected to the primary side of transformer in LED string module after being connected with n balancing capacitance in balancing capacitance module respectively, constant frequency control module is responsible for controlling the conducting and shut-off of half bridge switching circuit breaker in middle pipe, the secondary output voltage and primary resonant electric current of feedback control module sampling transformer, the signal for producing control variable capacitance circuit breaker in middle pipe afterwards is compared with required reference voltage.The fixed half-bridge switch frequency of the present invention, by adjusting equivalent tank electric capacity come controlled output, makes load impedance characteristic not influenceed by switching frequency, both realizes automatic current equalizing, and with LED string open circuit protecting function.
Description
Technical field
It is more particularly to a kind of that electricity is balanced using condensance the present invention relates to a kind of multi-channel LED driving power source field
The multi-channel LED drive circuit of stream.
Background technology
LED has the advantages that high efficiency, long-life and energy-conservation, is used widely in various lighting fields.But due to
LED characteristics and encapsulation technology, the brightness that single LEDs lamp bead can be provided in itself is subject to certain restrictions, it is necessary to pass through to increase
LED lamp bead quantity is come the brightness needed for obtaining.
Although it is identical to be connected in series the electric current that can ensure to flow through each lamp bead, under large-power occasions, it is sometimes desirable to several
The even more big output of hectowatt, the quantity of lamp bead is greatly increased, it is difficult to obtain a larger output voltage.Using multichannel simultaneously
Connection connection can solve the problems, such as that driving voltage is excessive, and facilitate follow-up maintenance, but in order to reach consistent luminous intensity, respectively
The conversion efficiency of current difference and system between passage needs to pay close attention to,
The content of the invention
In order to overcome the above-mentioned deficiencies of the prior art, driven the invention provides a kind of condensance balanced type multi-channel LED
Dynamic circuit, equilibrium and efficiency for solving great power LED power supply multichannel output current, it is ensured that each LED lamp bead luminous intensity
Unanimously.
The present invention is realized using following technical scheme.
A kind of condensance balanced type multi-channel LED drive circuit, it include direct-current input power supplying, half bridge switching circuit,
Resonant inductance, resonant capacitance, shunt inductance, transformer, variable capacitance circuit, balancing capacitance module, LED string module, feedback
Control module and constant frequency control module；First input of the half bridge switching circuit connects the positive pole of direct-current input power supplying,
Second input connects the negative pole of direct-current input power supplying, and two output ends connect resonant inductance and tunable capacitor circuit respectively
One end, the other end of resonant inductance is connected with one end of resonant capacitance, after primary side and the shunt inductance of transformer are connected in parallel
Same Name of Ends be connected with the other end of resonant capacitance, the other end is connected to the other end of variable capacitance circuit；In LED string module
N LED string load is parallel-connected to transformer after being connected with n balancing capacitance in balancing capacitance module one to one respectively
Primary side, n >=1；Constant frequency control module is responsible for controlling the conducting and shut-off, feedback control mould of half bridge switching circuit breaker in middle pipe
Block sample transformer secondary output voltage and primary resonant electric current, compare with required reference voltage afterwards produce control can power transformation
The signal of capacitive circuit breaker in middle pipe.
Further, half bridge switching circuit inside includes two N-channel MOS switching tubes, that is, go up switching tube and lower switching tube；
First diode and first electric capacity are respectively the body diode and output capacitance of switching tube, second diode and second
Individual electric capacity is respectively the body diode and output capacitance of lower switching tube；The drain electrode of upper switching tube is being connected to direct-current input power supplying just
Pole, source electrode is connected with the drain electrode of lower switching tube, one end of resonant inductance, and the drain electrode of lower switching tube is negative with direct-current input power supplying
The grid of pole, primary ground terminal connection, upper switching tube and lower switching tube is connected respectively to two output ends of constant frequency control module.
Further, variable capacitance circuit inside includes two N-channel MOS switching tubes and reference capacitance, two N-channels
MOS switch pipe is left-handed opening pipe and right switching tube；3rd diode and the 4th diode is respectively left-handed opening pipe and the right side is opened
Close the body diode of pipe；Left-handed opening pipe is connected with the drain electrode of right switching tube, in the source electrode and half bridge switching circuit of left-handed opening pipe
Lower switching tube source electrode connection, the source electrode of right switching tube is connected with the other end of transformer primary.
Further, balancing capacitance inside modules include n model identical balancing capacitance, n >=1, n balancing capacitance
The Same Name of Ends that one end all exports with transformer secondary output be connected, the other end of each balancing capacitance distinguish one to one with LED string mould
The positive input terminal connection of each LED string load in block.
Further, LED string inside modules include the load of n group LEDs string, the negative input end of each lamp string load with change
The other end of the secondary output of depressor, secondary ground terminal connection.
Further, three inputs of feedback control module are respectively resonance current sampling end, transformer secondary output output
Voltage sample end, reference voltage input terminal, the grid of 2 output ends respectively with two switching tubes in variable capacitance circuit are connected.
Further, constant frequency control module exports fixed frequency, the control signal of fixed duty cycle to half bridge switching circuit,
Half bridge switching circuit is adjusted to direct-current input power supplying, and output periodic rectangular ripple is by resonant inductance, resonant capacitance, variable
The resonant tank of condenser network composition, is exported by transformer coupled to secondary, and balancing capacitance module and LED string module constitute n
Individual LED string load channel, secondary by transformer provides energy, and constant frequency control module makes two switches in half bridge switching circuit
The fixed switching frequency of pipe holding, secondary output voltage and primary resonant electric current that feedback control module passes through transformer of sampling,
Compare with required reference voltage and produce afterwards two signals of switching tube in control variable capacitance circuit, adjust variable capacitance circuit
Equivalent capacitance value, i.e. total resonant capacitance and resonant frequency of regulating loop, according to the voltage transfering function of circuit, secondary output
Voltage also changes therewith, the current value needed for finally giving each channel LED lamp string load.
As described above, condensance balanced type multi-channel LED drive circuit of the present invention, with following beneficial effect
Really：
(1) circuit can realize Sofe Switch, smaller switching tube using half-bridge logical link control (LLC) resonant topology under any loading condition
Switching loss, improve circuit conversion efficiency.
(2) using the method for fixed resonance topological switching frequency, each channel load (including balancing capacitance and LED string) is made
Characteristic keeps constant, simplifies the complexity of system fading margin.
(3) by adjusting the equivalent capacity of variable capacitance circuit (4), so as to change the resonant frequency of system, can reach
The function of output voltage is adjusted, can ensure that the current value of other passages is constant in load open circuit again.
Brief description of the drawings
Fig. 1 is circuit block diagram of the invention；
Fig. 2 is constant frequency control module internal frame diagram of the invention；
Fig. 3 is feedback control module internal frame diagram of the invention；
Fig. 4 is the connection diagram of LED string of the invention；
Fig. 5 is the circuit diagram of one embodiment of the invention；
Fig. 6 is main oscillogram in Fig. 5 embodiments.
Specific embodiment
Embodiments of the invention are described in detail below in conjunction with the accompanying drawings, so that of the invention can a little be more easy to feature
In being readily appreciated by one skilled in the art.
Fig. 1, Fig. 2, Fig. 3 and Fig. 4 are referred to, the embodiment of the present invention includes：
A kind of condensance balanced type multi-channel LED drive circuit, including：Direct-current input power supplying Vin, half bridge switching circuit
1st, resonant inductance Lr, resonant capacitance Cr, shunt inductance Lm, transformer T1, variable capacitance circuit 3, balancing capacitance module 5, LED
String module 6, feedback control module 3, constant frequency control module 2.
As shown in Fig. 2 constant frequency control module include pierce circuit, 2 amplifying circuits, 2 fixed dead-zone circuits,
2 buffers.First output end of pierce circuit is connected with the input of first amplifying circuit OP1, amplifying circuit OP1's
Output end is connected to first input of fixed dead-zone circuit, and the output of fixed dead-zone circuit is by first buffer Buf1
Afterwards as the first output port VQ1 of constant frequency control module, similarly, the second output end of pierce circuit is amplified with second
It is defeated as the second of constant frequency control module after circuit OP, second fixed dead-zone circuit, second buffer Buf2 are sequentially connected in series
Go out and hold VQ2, two signals of output end are symmetrical in a cycle, and with fixed identical dead band.
As shown in figure 3, feedback control module includes peak detection circuit, error amplifying circuit, first comparator CMP1, saw
Tooth ripple module, the second comparator CMP2, zero cross detection circuit, two logical AND gates.Current sample end Isense and zero passage detection
The input connection of circuit, positive output end Vp, the negative output terminal Vn of zero cross detection circuit respectively with the first logical AND gate Gate1,
One end connection of the second logical AND gate Gate2, two other ends of logical AND gate connect with the output end EN2 of the second comparator
Connect, the positive input terminal ground connection of first comparator CMP1, output of the negative input end with current sample end after taking absolute value is connected, defeated
Go out to hold EN1 to be connected with sawtooth waveforms module, control the sawtooth waveforms for producing to be connected to the negative input end of the second comparator CMP2, voltage is adopted
The one end of sample end Vsense with the first feedback resistance Rf1 after peak detection circuit is connected, the other end of the first feedback resistance Rf1
Negative input end, one end of the second feedback resistance Rf2 with error amplifier EA1, one end of the first feedback capacity Cf1 are connected, the
One end of two feedback capacity Cf2 is connected with the other end of the second feedback resistance Rf2, the other end and the second comparator CMP2 positive inputs
End, the other end of the first feedback capacity Cf1, error amplifier EA1 output ends connection, the positive input terminal of error amplifier EA1 with
Reference voltage end Vref is connected.
As shown in figure 4, the load of LED string includes rectifier circuit, output filter capacitor, LED strip.LED lamp bead series connection connects
Anode, negative electrode after connecing positive pole respectively with output filter capacitor Con, negative pole are connected, first negative electrode and of diode Dn1
Two negative electrodes of diode Dn2, the positive pole connections of output filter capacitor Con, anode are connected with the negative electrode of the 3rd diode Dn3
Negative pole, the 4th of the positive input terminal for being loaded as LED string afterwards, the 3rd anode of diode Dn3 and output filter capacitor Con
Individual diode Dn4 anode connection, the negative electrode of the 4th diode Dn4 be connected with the anode of second diode Dn2 after conduct
The negative input end of LED string load.By output filter capacitor Con voltage regulation filterings after the rectified bridge rectification of input signal, finally for
LED string provides the operating current of stabilization.
By taking 3 channel LED lamp strings as an example, as shown in Figure 5.Born with first LED string first one end of balancing capacitance Cb1
The positive input terminal connection of load, the positive input terminal that second one end of balancing capacitance Cb2 loads with second LED string is connected, the
The positive input terminal that three one end of balancing capacitance Cb3 load with the 3rd LED string is connected, and another of three balancing capacitances is equal
The secondary output Same Name of Ends of transformer T1 is connected to, the negative input end of three LED string loads is connected with secondary ground terminal.
When circuit normal work, the electric current in each LED string is
iLEDn=Vo/(Xcbn+RLEDn)
Wherein, iLEDnRepresent the n-th channel LED lamp string load electric current, the primary output voltage of Vo indication transformers T1,
XcbnRepresent n-th impedance of balancing capacitance, RLEDnRepresent the equiva lent impedance of the n-th channel LED lamp string load, Xcbn=k*RLEDn, k
≥4.And the impedance of balancing capacitance is relevant with the switching frequency fs of half bridge switching circuit, it is
The switching frequency of the fixed half-bridge resonance topology of the present invention, then balancing capacitance and the equiva lent impedance of LED string load are equal
It is constant.The voltage transfering function of circuit is as follows,
Wherein, XLeqIt is load equivalent to the equiva lent impedance of transformer T1 primary sides, XLmIt is the impedance of shunt inductance Lm,
XLeq||XLmRepresent two parallel connections of impedance, XLrIt is the impedance of resonant inductance, XCrIt is the impedance of resonant capacitance, Xca_eqExpression can
Become the equiva lent impedance of condenser network, except Xca_eqOutward, remaining parameter is fixed value, by the equivalent electric for adjusting variable capacitance circuit
Capacitance, you can obtain required output voltage values.And the equivalent capacitance value of variable capacitance circuit is
Wherein, Ca is the reference capacitance in variable capacitance circuit, and θ is two conductings of switching tube in variable capacitance circuit
Angle, pi/2≤θ ＜ π.
Refering to Fig. 6, the electric current loaded by first passage LED string is differed about with the output voltage phase of transformer T1
90 °, when each balancing capacitance takes identical parameters Cb, the electric current of each channel LED lamp string load is
ILED≈Vo·j2πfsCb
When certain channel LED lamp string is loaded to be disconnected, load equivalent changes to the equiva lent impedance of transformer T1 primary sides
Become, but by adjusting the equivalent capacity of variable capacitance circuit, output voltage is kept constant, you can to ensure other channel LED lamps
The current value for loading of going here and there is constant, it is to avoid loss LED string.
Summary, a kind of condensance balanced type multi-channel LED drive circuit of the present invention, with following beneficial
Effect：1) circuit can realize Sofe Switch using half-bridge logical link control (LLC) resonant topology under any loading condition, and smaller switching tube is opened
Loss is closed, the conversion efficiency of circuit is improved；2) using the method for fixed resonance topological switching frequency, make each channel load (including
Balancing capacitance and LED string) characteristic keep it is constant, simplify system fading margin complexity.3) by adjusting variable capacitance circuit (4)
Equivalent capacity, so as to change the resonant frequency of system, the function of regulation output voltage can be reached, again can be in load open circuit
Ensure that the current value of other passages is constant.
It will be appreciated by those skilled in the art that a kind of condensance balanced type multi-channel LED disclosed in this invention drives
Circuit, can make various improvement on the basis of present invention is not departed from.Therefore protection scope of the present invention should be by institute
The content of attached claims determines.
Claims (7)
1. a kind of condensance balanced type multi-channel LED drive circuit, it is characterised in that including direct-current input power supplying (Vin), half
Bridge switch circuit (1), resonant inductance (Lr), resonant capacitance (Cr), shunt inductance (Lm), transformer (T1), variable capacitance circuit
(4), balancing capacitance module (5), LED string module (6), feedback control module (3) and constant frequency control module (2)；The half-bridge
The positive pole of first input connection direct-current input power supplying (Vin) of on-off circuit (1), second input connection direct current input
The negative pole of power supply, two output ends connect one end of resonant inductance (Lr) and tunable capacitor circuit (4), resonant inductance (Lr) respectively
The other end be connected with one end of resonant capacitance (Cr), after the primary side of transformer (T1) is connected in parallel with shunt inductance (Lm)
Same Name of Ends is connected with the other end of resonant capacitance (Cr), and the other end is connected to the other end of variable capacitance circuit (4)；LED string
N LED string load is in parallel after being connected with n balancing capacitance in balancing capacitance module (5) one to one respectively in module (6)
It is connected to the primary side of transformer (T1), n >=1；Constant frequency control module (2) is responsible for control half bridge switching circuit (1) breaker in middle pipe
Conducting with shut-off, feedback control module (3) sampling transformer (T1) secondary output voltage (Vo) and primary resonant electric current
(ir) signal for producing control variable capacitance circuit (4) breaker in middle pipe afterwards, is compared with required reference voltage.
2. condensance balanced type multi-channel LED drive circuit according to claim 1, it is characterised in that half-bridge switch
Include two N-channel MOS switching tubes (Q1, Q2) inside circuit (1), that is, go up switching tube (Q1) and lower switching tube (Q2)；First
Diode (DQ1) and first electric capacity (C1) are respectively the body diode and output capacitance of switching tube (Q1), second two pole
Pipe (DQ2) and second electric capacity (C2) are respectively the body diode and output capacitance of lower switching tube (Q2)；Upper switching tube (Q1)
Drain electrode is connected to the positive pole of direct-current input power supplying (Vin), source electrode and the drain electrode of lower switching tube (Q2), one end of resonant inductance (Lr)
Connection, the drain electrode of lower switching tube (Q2) and the negative pole of direct-current input power supplying (Vin), primary ground terminal are connected, upper switching tube (Q1) and
The grid of lower switching tube (Q2) is connected respectively to two output ends of constant frequency control module (2).
3. condensance balanced type multi-channel LED drive circuit according to claim 1, it is characterised in that variable capacitance
Include two N-channel MOS switching tubes (S1, S2) and reference capacitance (Ca), two N-channel MOS switching tubes inside circuit (4)
(S1, S2) is left-handed opening pipe (S1) and right switching tube (S2)；3rd diode (DS1) and the 4th diode (DS2) are respectively
It is left-handed opening pipe (S1) and the body diode of right switching tube (S2)；Left-handed opening pipe (S1) is connected with the drain electrode of right switching tube (S2)
Connect, the source electrode of left-handed opening pipe (S1) is connected with the source electrode of the lower switching tube (Q2) in half bridge switching circuit (1), right switching tube (S2)
Source electrode be connected with the other end of transformer (T1) primary side.
4. condensance balanced type multi-channel LED drive circuit according to claim 1, it is characterised in that balancing capacitance
Include n model identical balancing capacitance (Cb1, Cb2 ... Cbn) inside module (5), n >=1, n one end of balancing capacitance all with
The Same Name of Ends connection of the secondary output of transformer (T1), the other end of each balancing capacitance respectively one to one with LED string module (6)
In the load of each LED string positive input terminal connection.
5. condensance balanced type multi-channel LED drive circuit according to claim 1, it is characterised in that LED string mould
Block (6) is internal including the load of n group LEDs string, and the negative input end of each lamp string load is another with the secondary output of transformer (T1)
End, secondary ground terminal connection.
6. condensance balanced type multi-channel LED drive circuit according to claim 1, it is characterised in that feedback control
Three inputs of module (3) are respectively resonance current sampling end, transformer (T1) secondary output voltage sampling end, reference voltage
Input, the grid of 2 output ends respectively with two switching tubes (S1, S2) in variable capacitance circuit (4) is connected.
7. the condensance balanced type multi-channel LED drive circuit according to any one of claim 1~6, it is characterised in that
Constant frequency control module (2) exports fixed frequency, the control signal of fixed duty cycle and gives half bridge switching circuit (1), half-bridge switch electricity
Road (1) is adjusted to direct-current input power supplying (Vin), and output periodic rectangular ripple is by resonant inductance (Lm), resonant capacitance
(Cr), the resonant tank of variable capacitance circuit (4) composition, secondary output (Vo), balancing capacitance mould are coupled to by transformer (T1)
Block (5) and LED string module (6) constitute n LED string load channel, and secondary by transformer (T1) provides energy, constant frequency control
Two switching tubes keep fixed switching frequency (fs), feedback control module (3) during molding block (2) makes half bridge switching circuit (1)
By the secondary output voltage (Vo) and primary resonant electric current (ir) of transformer of sampling (T1), with required reference voltage (Vref)
Two signals of switching tube in control variable capacitance circuit (4), the equivalent capacity of regulation variable capacitance circuit (4) are produced more afterwards
Value, i.e. total resonant capacitance of regulating loop and resonant frequency (fr), according to the voltage transfering function of circuit, secondary output voltage
(Vo) also change therewith, the current value needed for finally giving each channel LED lamp string load.
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| CN201710197919.8A CN106879118B (en) | 2017-03-29 | 2017-03-29 | A kind of condensance balanced type multi-channel LED driving circuit |
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| CN201710197919.8A CN106879118B (en) | 2017-03-29 | 2017-03-29 | A kind of condensance balanced type multi-channel LED driving circuit |
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| CN106879118A true CN106879118A (en) | 2017-06-20 |
| CN106879118B CN106879118B (en) | 2018-10-09 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108521694A (en) * | 2018-03-29 | 2018-09-11 | 电子科技大学 | A kind of LED half-bridge circuits of band feedback frequency-conversion constant-current driving |
| CN109121252A (en) * | 2018-09-25 | 2019-01-01 | 深圳市中州远光照明科技有限公司 | A kind of LED drive power |
| CN109121253A (en) * | 2018-09-26 | 2019-01-01 | 深圳市中州远光照明科技有限公司 | A kind of adjustable voltage LED drive power and driving method |
| CN111147020A (en) * | 2020-01-16 | 2020-05-12 | 张雁 | High-power LC oscillating circuit |
| CN113328805A (en) * | 2021-05-13 | 2021-08-31 | 李刚 | Wireless non-contact free space optical communication system |
| CN113329538A (en) * | 2021-04-25 | 2021-08-31 | 南京中感微电子有限公司 | LED drive circuit |
| CN114285314A (en) * | 2021-12-30 | 2022-04-05 | 吉林大学 | High-stability pulse current source based on single chip microcomputer control |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108521694A (en) * | 2018-03-29 | 2018-09-11 | 电子科技大学 | A kind of LED half-bridge circuits of band feedback frequency-conversion constant-current driving |
| CN108521694B (en) * | 2018-03-29 | 2023-09-22 | 电子科技大学 | LED half-bridge circuit with feedback variable-frequency constant-current drive |
| CN109121252A (en) * | 2018-09-25 | 2019-01-01 | 深圳市中州远光照明科技有限公司 | A kind of LED drive power |
| CN109121253A (en) * | 2018-09-26 | 2019-01-01 | 深圳市中州远光照明科技有限公司 | A kind of adjustable voltage LED drive power and driving method |
| CN111147020A (en) * | 2020-01-16 | 2020-05-12 | 张雁 | High-power LC oscillating circuit |
| CN113329538A (en) * | 2021-04-25 | 2021-08-31 | 南京中感微电子有限公司 | LED drive circuit |
| CN113328805A (en) * | 2021-05-13 | 2021-08-31 | 李刚 | Wireless non-contact free space optical communication system |
| CN113328805B (en) * | 2021-05-13 | 2022-09-13 | 李刚 | Wireless non-contact free space optical communication system |
| CN114285314A (en) * | 2021-12-30 | 2022-04-05 | 吉林大学 | High-stability pulse current source based on single chip microcomputer control |
| CN114285314B (en) * | 2021-12-30 | 2023-09-12 | 吉林大学 | High-stability pulse current source based on single chip microcomputer control |
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| Publication number | Publication date |
|---|---|
| CN106879118B (en) | 2018-10-09 |
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