CN101770247B - Portable power-frequency constant current source device - Google Patents
Portable power-frequency constant current source device Download PDFInfo
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- CN101770247B CN101770247B CN 201010033314 CN201010033314A CN101770247B CN 101770247 B CN101770247 B CN 101770247B CN 201010033314 CN201010033314 CN 201010033314 CN 201010033314 A CN201010033314 A CN 201010033314A CN 101770247 B CN101770247 B CN 101770247B
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims abstract description 48
- 229910052744 lithium Inorganic materials 0.000 claims abstract description 48
- 238000005070 sampling Methods 0.000 claims abstract description 11
- 239000003990 capacitor Substances 0.000 claims description 58
- 238000006243 chemical reaction Methods 0.000 claims description 19
- 230000002093 peripheral effect Effects 0.000 claims description 9
- 238000012544 monitoring process Methods 0.000 claims description 6
- 239000013078 crystal Substances 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 4
- 239000004973 liquid crystal related substance Substances 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 2
- 101100156949 Arabidopsis thaliana XRN4 gene Proteins 0.000 description 1
- 101100215777 Schizosaccharomyces pombe (strain 972 / ATCC 24843) ain1 gene Proteins 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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Abstract
The invention relates to a portable power-frequency constant current source device comprising a control circuit, a liquid crystal display (LCD) with a touch screen, a constant current output circuit, an output current sampling circuit, a lithium battery and a DC-DC converting circuit, wherein the LED with the touch screen is bidirectionally connected with the control circuit, the output end of the control circuit is connected with the input end of the constant current output circuit, and the output current sampling circuit is connected with the output end of the constant current output circuit after connected with a load in series; the output end of the output current sampling circuit is respectively connected with the corresponding input ends of the control circuit and the constant current output circuit; and the lithium battery is used for respectively providing power for the control circuit, the constant current output circuit and the DC-DC converting circuit, and the DC-DC converting circuit is used for respectively providing power for the control circuit and the LED with the touch screen. The portable power-frequency constant current source device has the advantages of small size, light weight and portability and can flexibly set the amplitude and the frequency of output current, thereby providing convenience for the examining and repairing work of electric power subsystems.
Description
Technical field
The present invention relates to a kind of portable power-frequency constant current source device, belong to the constant current source technical field, be applicable to the electric system maintenance.
Background technology
In the electric system service work, often need reliable and stable constant current source.What constant-current device application at present was maximum is hand or digital interchange constant flow regulation equipment, adopts an automatic coupling voltage regulator usually, controls output current through number or digital control regulation voltage.Though present digital constant current source is less than the volume of hand constant current source, is not easy to carry, moreover needs external power supply.
Summary of the invention
Technical matters to be solved by this invention provides a kind of volume portable power-frequency constant current source device little, in light weight, easy to use.
The technical solution adopted for the present invention to solve the technical problems:
The present invention includes LCD, constant current output circuit, output current sample circuit, lithium battery and the DC-DC change-over circuit of control circuit, band touch-screen; The LCD of said band touch-screen is connected with control circuit is two-way, the input end of the output termination constant current output circuit of said control circuit, said output current sample circuit and the output terminal that is connected on said constant current output circuit after load is connected; The output terminal of said output current sample circuit connects the respective input of said control circuit and constant current output circuit respectively; Said lithium battery is respectively said control circuit, constant current output circuit and DC-DC change-over circuit power supply is provided, and the LCD that said DC-DC change-over circuit is respectively said control circuit and band touch-screen provides power supply.
The present invention also includes charger.
The invention has the beneficial effects as follows that volume is little, in light weight, be easy to carry, can set output current amplitude and frequency flexibly, for the power subsystem service work provides convenience.
Description of drawings
Fig. 1 is a theory diagram of the present invention.
Fig. 2 is the circuit theory diagrams of control circuit.
Fig. 3 is the circuit theory diagrams of constant current output circuit and output current sample circuit.
Fig. 4 is the circuit theory diagrams of DC-DC change-over circuit.
Embodiment
Embodiment by shown in Fig. 1-4 can know that it includes LCD, constant current output circuit, output current sample circuit, lithium battery and the DC-DC change-over circuit of control circuit, band touch-screen; The LCD of said band touch-screen is connected with control circuit is two-way, the input end of the output termination constant current output circuit of said control circuit, said output current sample circuit and the output terminal that is connected on said constant current output circuit after load is connected; The output terminal of said output current sample circuit connects the respective input of said control circuit and constant current output circuit respectively; Said lithium battery is respectively said control circuit, constant current output circuit and DC-DC change-over circuit power supply is provided, and the LCD that said DC-DC change-over circuit is respectively said control circuit and band touch-screen provides power supply.
Present embodiment also includes charger.
Said lithium battery is made up of the first lithium battery E1 to the, three lithium battery E3; The positive terminal of the said first lithium battery E1 is VB, its minus earth; The said second lithium battery E2 is composed in series positive and negative voltage source by two lithium batteries, and its positive voltage terminal is VP+, and its negative voltage side is VP-, the node ground connection of two lithium batteries of said series connection; Said the 3rd lithium battery E3 is the backup battery of single-chip microcomputer U1.
Said control circuit is made up of single-chip microcomputer U1 and peripheral cell thereof, constant current output drive signal treatment circuit, output current sampled signal treatment circuit, lithium battery voltage observation circuit;
Said single-chip microcomputer U1 adopts the mixed signal single-chip microcomputer, and its model is C8051F410, and the peripheral cell of said single-chip microcomputer U1 is made up of crystal Y1-Y2, capacitor C 1-C7, resistance R 1, inductance L 1, socket J1 and jumper switch JP1; Said socket J1 is single-chip microcomputer U1 and the gang socket of the LCD of band touch-screen, inductance L 1 is connected on the series filtering circuit that capacitor C 2 is formed+5V and ground between, the node of inductance L 1 and capacitor C 2 connects 1 pin and 8 pin of single-chip microcomputer U1; The 3rd lithium battery E3 is connected between 3 pin and ground of single-chip microcomputer U1; Crystal Y1 is connected between 4 pin and 5 pin of single-chip microcomputer U1 through jumper switch JP1;
Said constant current output drive signal treatment circuit is made up of second order active low-pass filter and digital regulation resistance U3; Said second order active low-pass filter is made up of resistance R 2-R4, capacitor C 8-C10, integrated package U2B; Output terminal 17 pin of said single-chip microcomputer U1 connect positive input terminal 5 pin of integrated package U2B successively through resistance R 3, resistance R 4, output terminal 7 pin of said integrated package U2B connect input end 5 pin of digital regulation resistance U3, and 7 pin of integrated package U2B are connected with 6 pin; Output terminal 6 pin of said digital regulation resistance U3 are the input end A ' that the A point connects constant current output circuit, and the 1-3 pin of said digital regulation resistance U3 connects 15 pin of single-chip microcomputer U1,12 pin, 14 pin respectively;
Said output current sampled signal treatment circuit is made up of gain-programmed amplifier U4 and two adding circuits; First adding circuit is made up of resistance R 5-R7, capacitor C 12; Resistance R 6 be connected on after resistance R 7 is connected+5V and ground between; One end B ' of resistance R 5 meets the output terminal B of said output current sample circuit; Input end 2 pin of the said gain-programmed amplifier U4 of another termination of resistance R 5, the node of resistance R 6 and resistance R 7 connects input end 2 pin of gain-programmed amplifier U4, and capacitor C 12 is parallelly connected with resistance R 7; Second adding circuit that produces reference signal is made up of resistance R 8-R10, impact damper U2A; Resistance R 8 be connected on after resistance R 9 is connected+5V and ground between; The node of resistance R 8 and resistance R 9 connects positive input terminal 3 pin of impact damper U2A; Output terminal 1 pin of impact damper U2A connects another input end 3 pin of gain-programmed amplifier U4, and 1 pin of impact damper U2A is connected with 2 pin; Resistance R 10 is parallelly connected with resistance R 9; The control input end 5-7 pin of gain-programmed amplifier U4 connects 16 pin, 14 pin, 12 pin of single-chip microcomputer U1 respectively;
Said lithium battery voltage observation circuit is made up of first to the 3rd observation circuit, the voltage of the said first monitoring circuit monitors VB, and it is made up of resistance R 12-R13, capacitor C 14; Resistance R 12 be connected between VB and the ground after resistance R 13 is connected, resistance R 12 and the node of resistance R 13 connect 20 pin of single-chip microcomputer U1, capacitor C 14 is parallelly connected with resistance R 13; The voltage of said second monitoring circuit monitors VP-and+5V, it is made up of resistance R 27-R29, capacitor C 24; Resistance R 27-R29 is star-like connection, and its node connects 21 pin of single-chip microcomputer U1, another termination+5V of resistance R 27, and another termination VP-of resistance R 28, the other end ground connection of resistance R 29, capacitor C 24 is parallelly connected with resistance R 29; The voltage of said the 3rd monitoring circuit monitors VP+, it is made up of resistance R 30-R31, capacitor C 25; Resistance R 30 be connected between VP+ and the ground after resistance R 31 is connected, resistance R 30 and the node of resistance R 31 connect 22 pin of single-chip microcomputer U1, capacitor C 25 is parallelly connected with resistance R 31.
Said constant current output circuit is made up of great current operation amplifier U5 and peripheral cell resistance R 14-R17 thereof, capacitor C 15-C19, diode D1-D2, the second lithium battery E2, K switch 2-K3; Output terminal 6 pin that the input end 4 foot meridian capacitor C15 of said great current operation amplifier U5 meet digital regulation resistance U3 are the A point, and output terminal 1 pin of great current operation amplifier U5 is connected the back and is the continuous current output terminal with 2 pin; The V+ end of great current operation amplifier U5 is held through the VP+ that K switch 2 meets the second lithium battery E2, and the V-end of great current operation amplifier U5 connects the VP-end of the second lithium battery E2 through K switch 3; Capacitor C 17 is connected between the V-end and ground of great current operation amplifier U5, and capacitor C 18 is connected between the V+ end and ground of great current operation amplifier U5; The output compensation branch road that resistance R 17 and capacitor C 19 are composed in series is connected between output terminal 1 pin and ground of great current operation amplifier U5, and diode D1 is connected between 1 pin and 5 pin of great current operation amplifier U5; Diode D2 is connected between 1 pin and 10 pin of great current operation amplifier U5; One end ground connection of resistance R 14, its other end is connected with the node of capacitor C 15 with 4 pin of great current operation amplifier U5; Resistance R 15 is connected between 6 pin and 8 pin of great current operation amplifier U5 with the output overcurrent protection threshold circuit that capacitor C 16 parallelly connected backs are formed;
6 pin of said great current operation amplifier U5 connect the VP-end of the second lithium battery E2.
Said output current sample circuit is made up of sampling resistor R18; Sampling resistor R18 be connected between output terminal 1 pin and ground of great current operation amplifier U5 after load RL connects; A road of the Node B of sampling resistor R18 and load RL meets the input end B ' of first adding circuit, and its another road connects 3 pin of great current operation amplifier U5.
Said DC-DC change-over circuit is made up of DC-DC conversion and control chip U6 and peripheral cell resistance R 19-R21 thereof, capacitor C 21-C22, the first lithium battery E1, K switch 1, input filter circuit, output filter circuit, power indicating circuit, feedback circuit; Said input filter circuit is made up of inductance L 2, capacitor C 20, the minus earth of the first lithium battery E1; Be connected on the two ends of the first lithium battery E1 after K switch 1, inductance L 2, capacitor C 20 are connected successively, the node of inductance L 2 and capacitor C 20 connects input end 7 pin of DC-DC conversion chip U6;
Said output filter circuit is made up of diode D3, inductance L 3, capacitor C 23; Inductance L 3 be connected between output terminal 14 pin and ground of DC-DC conversion chip U6 after capacitor C 23 is connected, diode D3 is connected between 14 pin and ground of DC-DC conversion chip U6; Output terminal 14 pin of DC-DC conversion chip U6 link to each other with 15 pin;
Said power indicating circuit is made up of resistance R 22-R23, LED 1; Resistance R 22, resistance R 23, LED 1 back of connecting successively is parallelly connected with capacitor C 23, and the node of resistance R 22 and resistance R 23 is+output terminal of 5V;
Said feedback circuit is made up of resistance R 24-R26, is connected on after resistance R 24-R26 connects successively between the node and ground of inductance L 3 and capacitor C 23, and the node of resistance R 25 and resistance R 26 connects 2 pin of DC-DC conversion chip U6;
The bootstrapping branch road that resistance R 21 and capacitor C 22 are composed in series is connected between 15 pin and 16 pin of DC-DC conversion chip U6;
Resistance R 20 is connected between 3 pin and 6 pin of DC-DC conversion chip U6 with the frequency setting loop that capacitor C 21 parallelly connected backs are formed, and the 3-5 pin of DC-DC conversion chip U6 connects mutually.
The course of work of present embodiment:
1, the course of work (see figure 2) of control circuit:
Control circuit shown in Figure 2 is a core with mixed signal single-chip microcomputer U1 (C8051F410), utilizes its built-in DAC and ADC to realize waveform generation and measurement function respectively.The sinusoidal signal that DAC produces converts sine voltage signal with P0.0 (the 17th pin) output of current forms from U1 into through resistance R 2, and the second order active low-pass filter filtering noise of being made up of R3, R4, C9, C10 and U2B then obtains clean sine voltage signal.This signal obtains the constant current source drive signal through digital regulation resistance U3 (MCP41010) dividing potential drop, and intrinsic standoff ratio through the control of SPI interface, is realized the adjustment drive signal amplitude by U1, thus the purpose of control constant current source output current amplitude.From the AC signal of sampling resistor R18 through first adding circuit that R5-R7 forms with+migrated to the DC level of 1V after 5V mixes.The DC voltage that second adding circuit of being made up of R5-R10 produces 1V is connected to gain-programmed amplifier U4 after operational amplifier U2A buffering the 3rd pin is signal as a reference.Like this, current detection signal by R11 and C13 filtering, is delivered to the input end AIN1 (the 19th pin) of the built-in ADC of U1 at last after U4 amplifies.Can calculate current value and deliver to the LCD demonstration by the AD transformation result.The voltage VB of the first lithium battery E1 is connected to the AIN2 input end of the built-in ADC of U11 after R12, R13 dividing potential drop, single-chip microcomputer U1 can monitor the voltage of the first lithium battery E1, provides low capacity prompt.J1 is the interface socket of the LCD of connecting band touch-screen, comprises SPI interface signal and 5V power supply.
2, the course of work (see figure 3) of constant current output circuit and output current sample circuit:
In Fig. 3, add that by great current operation amplifier U5 (OPA549S) peripheral components constitutes.The voltage signal of input is added to the positive input terminal (the 4th pin) of U5 after the Hi-pass filter of C15 and R14 formation removes direct current signal.The output of U5 provides electric current to load RL, and this electric current arrives ground through sampling resistor R18.The R18 upper end is connected to the negative input end (the 3rd pin) of U5, realizes the constant current source function.The R18 upper end is connected to the input end B ' of output current sampled signal treatment circuit simultaneously, and R15 and C16 set the output overcurrent protection threshold value of U5.D1 and D2 are as the output port protection, and R17 and C19 are the output compensating circuit.C17-C18 is an electrical power by-pass electric capacity.
3, the course of work (see figure 4) of DC-DC change-over circuit:
The DC-DC change-over circuit uses the voltage transitions of the first lithium battery E1 for the LCD that is fit to control circuit and band touch-screen 5V voltage, circuit shown in Figure 4 is a core with DC-DC conversion and control chip U6 (NCP3173PW), works in the BUCK pattern.The first lithium battery E1 voltage is added to the input filter circuit that is made up of L2, C20 through K switch 1, is connected to the input end (the 7th pin) of U6 then.Obtain direct current 5V power supply behind the output filter circuit of the pwm switching signal of U6 output via D3, L3, C23 formation, output voltage values is by the parameter determining of feedback branch R24-R26.R26 sets the overcurrent protection threshold value, and R20 and C21 set oscillation frequency, and R21 and C22 constitute the bootstrapping branch road.The effect of R22 is to debug for ease, and R23 and LED1 form power indicating circuit.
Claims (1)
1. a portable power-frequency constant current source device is characterized in that said device includes LCD, constant current output circuit, output current sample circuit, lithium battery and the DC-DC change-over circuit of control circuit, band touch-screen; The LCD of said band touch-screen is connected with control circuit is two-way, the input end of the output termination constant current output circuit of said control circuit, said output current sample circuit and the output terminal that is connected on said constant current output circuit after load is connected; The output terminal of said output current sample circuit connects the respective input of said control circuit and constant current output circuit respectively; Said lithium battery is respectively said control circuit, constant current output circuit and DC-DC change-over circuit power supply is provided, and the LCD that said DC-DC change-over circuit is respectively said control circuit and band touch-screen provides power supply;
Said device also includes charger;
Said lithium battery is made up of the first lithium battery E1 to the, three lithium battery E3; The positive terminal of the said first lithium battery E1 is VB, its minus earth; The said second lithium battery E2 is composed in series positive and negative voltage source by two lithium batteries, and its positive voltage terminal is VP+, and its negative voltage side is VP-, the node ground connection of two lithium batteries of said series connection; Said the 3rd lithium battery E3 is the backup battery of single-chip microcomputer U1;
Said control circuit is made up of single-chip microcomputer U1 and peripheral cell thereof, constant current output drive signal treatment circuit, output current sampled signal treatment circuit, lithium battery voltage observation circuit;
Said single-chip microcomputer U1 adopts the mixed signal single-chip microcomputer, and its model is C8051F410, and the peripheral cell of said single-chip microcomputer U1 is made up of crystal Y1-Y2, capacitor C 1-C7, resistance R 1, inductance L 1, socket J1 and jumper switch JP1; Said socket J1 is single-chip microcomputer U1 and the gang socket of the LCD of band touch-screen, inductance L 1 is connected on the series filtering circuit that capacitor C 2 is formed+5V and ground between, the node of inductance L 1 and capacitor C 2 connects 1 pin and 8 pin of single-chip microcomputer U1; The 3rd lithium battery E3 is connected between 3 pin and ground of single-chip microcomputer U1; Crystal Y1 is connected between 4 pin and 5 pin of single-chip microcomputer U1 through jumper switch JP1;
Said constant current output drive signal treatment circuit is made up of second order active low-pass filter and digital regulation resistance U3; Said second order active low-pass filter is made up of resistance R 2-R4, capacitor C 8-C10, integrated package U2B; Output terminal 17 pin of said single-chip microcomputer U1 connect positive input terminal 5 pin of integrated package U2B successively through resistance R 3, resistance R 4, output terminal 7 pin of said integrated package U2B connect input end 5 pin of digital regulation resistance U3, and 7 pin of integrated package U2B are connected with 6 pin; Output terminal 6 pin of said digital regulation resistance U3 are the input end A ' that the A point connects constant current output circuit, and the 1-3 pin of said digital regulation resistance U3 connects 15 pin of single-chip microcomputer U1,12 pin, 14 pin respectively;
Said output current sampled signal treatment circuit is made up of gain-programmed amplifier U4 and two adding circuits; First adding circuit is made up of resistance R 5-R7, capacitor C 12; Resistance R 6 be connected on after resistance R 7 is connected+5V and ground between; One end B ' of resistance R 5 meets the output terminal B of said output current sample circuit; Input end 2 pin of the said gain-programmed amplifier U4 of another termination of resistance R 5, the node of resistance R 6 and resistance R 7 connects input end 2 pin of gain-programmed amplifier U4, and capacitor C 12 is parallelly connected with resistance R 7; Second adding circuit that produces reference signal is made up of resistance R 8-R10, impact damper U2A; Resistance R 8 be connected on after resistance R 9 is connected+5V and ground between; The node of resistance R 8 and resistance R 9 connects positive input terminal 3 pin of impact damper U2A; Output terminal 1 pin of impact damper U2A connects another input end 3 pin of gain-programmed amplifier U4, and 1 pin of impact damper U2A is connected with 2 pin; Resistance R 10 is parallelly connected with resistance R 9; The control input end 5-7 pin of gain-programmed amplifier U4 connects 16 pin, 14 pin, 12 pin of single-chip microcomputer U1 respectively;
Said lithium battery voltage observation circuit is made up of first to the 3rd observation circuit, the voltage of the said first monitoring circuit monitors VB, and it is made up of resistance R 12-R13, capacitor C 14; Resistance R 12 be connected between VB and the ground after resistance R 13 is connected, resistance R 12 and the node of resistance R 13 connect 20 pin of single-chip microcomputer U1, capacitor C 14 is parallelly connected with resistance R 13; The voltage of said second monitoring circuit monitors VP-and+5V, it is made up of resistance R 27-R29, capacitor C 24; Resistance R 27-R29 is star-like connection, and its node connects 21 pin of single-chip microcomputer U1, another termination+5V of resistance R 27, and another termination VP-of resistance R 28, the other end ground connection of resistance R 29, capacitor C 24 is parallelly connected with resistance R 29; The voltage of said the 3rd monitoring circuit monitors VP+, it is made up of resistance R 30-R31, capacitor C 25; Resistance R 30 be connected between VP+ and the ground after resistance R 31 is connected, resistance R 30 and the node of resistance R 31 connect 22 pin of single-chip microcomputer U1, capacitor C 25 is parallelly connected with resistance R 31;
Said constant current output circuit is made up of great current operation amplifier U5 and peripheral cell resistance R 14-R17 thereof, capacitor C 15-C19, diode D1-D2, the second lithium battery E2, K switch 2～K3; Output terminal 6 pin that the input end 4 foot meridian capacitor C15 of said great current operation amplifier U5 meet digital regulation resistance U3 are the A point, and output terminal 1 pin of great current operation amplifier U5 is connected the back and is the continuous current output terminal with 2 pin; The V+ end of great current operation amplifier U5 is held through the VP+ that K switch 2 meets the second lithium battery E2, and the V-end of great current operation amplifier U5 connects the VP-end of the second lithium battery E2 through K switch 3; Capacitor C 17 is connected between the V-end and ground of great current operation amplifier U5, and capacitor C 18 is connected between the V+ end and ground of great current operation amplifier U5; The output compensation branch road that resistance R 17 and capacitor C 19 are composed in series is connected between output terminal 1 pin and ground of great current operation amplifier U5, and diode D1 is connected between 1 pin and 5 pin of great current operation amplifier U5; Diode D2 is connected between 1 pin and 10 pin of great current operation amplifier U5; One end ground connection of resistance R 14, its other end is connected with the node of capacitor C 15 with 4 pin of great current operation amplifier U5; Resistance R 15 is connected between 6 pin and 8 pin of great current operation amplifier U5 with the output overcurrent protection threshold circuit that capacitor C 16 parallelly connected backs are formed;
6 pin of said great current operation amplifier U5 connect the VP-end of the second lithium battery E2;
Said output current sample circuit is made up of sampling resistor R18; Sampling resistor R18 be connected between output terminal 1 pin and ground of great current operation amplifier U5 after load RL connects; A road of the Node B of sampling resistor R18 and load RL meets the input end B ' of first adding circuit, and its another road connects 3 pin of great current operation amplifier U5;
Said DC-DC change-over circuit is made up of DC-DC conversion and control chip U6 and peripheral cell resistance R 19-R21 thereof, capacitor C 21-C22, the first lithium battery E1, K switch 1, input filter circuit, output filter circuit, power indicating circuit, feedback circuit; Said input filter circuit is made up of inductance L 2, capacitor C 20, the minus earth of the first lithium battery E1; Be connected on the two ends of the first lithium battery E1 after K switch 1, inductance L 2, capacitor C 20 are connected successively, the node of inductance L 2 and capacitor C 20 connects input end 7 pin of DC-DC conversion chip U6;
Said output filter circuit is made up of diode D3, inductance L 3, capacitor C 23; Inductance L 3 be connected between output terminal 14 pin and ground of DC-DC conversion chip U6 after capacitor C 23 is connected, diode D3 is connected between 14 pin and ground of DC-DC conversion chip U6; Output terminal 14 pin of DC-DC conversion chip U6 link to each other with 15 pin;
Said power indicating circuit is made up of resistance R 22-R23, LED 1; Resistance R 22, resistance R 23, LED 1 back of connecting successively is parallelly connected with capacitor C 23, and the node of resistance R 22 and resistance R 23 is+output terminal of 5V;
Said feedback circuit is made up of resistance R 24-R26, is connected on after resistance R 24-R26 connects successively between the node and ground of inductance L 3 and capacitor C 23, and the node of resistance R 25 and resistance R 26 connects 2 pin of DC-DC conversion chip U6;
The bootstrapping branch road that resistance R 21 and capacitor C 22 are composed in series is connected between 15 pin and 16 pin of DC-DC conversion chip U6;
Resistance R 20 is connected between 3 pin and 6 pin of DC-DC conversion chip U6 with the frequency setting loop that capacitor C 21 parallelly connected backs are formed, and the 3-5 pin of DC-DC conversion chip U6 connects mutually.
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| CN 201010033314 CN101770247B (en) | 2010-01-07 | 2010-01-07 | Portable power-frequency constant current source device |
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| CN 201010033314 CN101770247B (en) | 2010-01-07 | 2010-01-07 | Portable power-frequency constant current source device |
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| CN101770247B true CN101770247B (en) | 2012-12-19 |
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| CN106125813A (en) * | 2016-08-01 | 2016-11-16 | 河北大学 | A kind of high stability constant-current source of portable wide amount limit |
| CN106527561B (en) * | 2017-01-04 | 2018-07-17 | 西南应用磁学研究所 | A kind of high-efficiency magnetic tuning device driving circuit of tracking with voltage |
| CN109992153B (en) * | 2019-03-06 | 2024-02-13 | 上海熙顺电气有限公司 | Direct-current linear power supply digital touch screen |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1858964A (en) * | 2005-10-27 | 2006-11-08 | 华为技术有限公司 | Circuit system for providing stable voltage variable constant current output |
| CN101221454A (en) * | 2007-12-04 | 2008-07-16 | 南京大学 | Direct current bias constant-current supply |
| CN201638098U (en) * | 2010-01-07 | 2010-11-17 | 石家庄供电公司 | Portable power-frequency constant current source device |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1858964A (en) * | 2005-10-27 | 2006-11-08 | 华为技术有限公司 | Circuit system for providing stable voltage variable constant current output |
| CN101221454A (en) * | 2007-12-04 | 2008-07-16 | 南京大学 | Direct current bias constant-current supply |
| CN201638098U (en) * | 2010-01-07 | 2010-11-17 | 石家庄供电公司 | Portable power-frequency constant current source device |
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