CN204205943U - A kind of power circuit based on LM1117 family chip - Google Patents
A kind of power circuit based on LM1117 family chip Download PDFInfo
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- CN204205943U CN204205943U CN201420504878.4U CN201420504878U CN204205943U CN 204205943 U CN204205943 U CN 204205943U CN 201420504878 U CN201420504878 U CN 201420504878U CN 204205943 U CN204205943 U CN 204205943U
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Abstract
The utility model discloses a kind of power circuit based on LM1117 family chip, comprise LM1117-3.3 power supply chip, 500 milliamperes of fuse F500L250V, 10u/10V courage electric capacity, 220uF/25V straight cutting alminium electrolytic condenser, 100 ohmic semiconductor resistance, 1k ohmic semiconductor resistance etc., described power input connects+5V working power, described power output end provides the stable operating voltage of+3.3V for digital servosystem, described LM117 chip is the linear voltage regulator integrated chip of the adjustable output of three ends, power circuit output voltage range based on LM117 is 1.2V to 3.7V, load current is 1.5A to the maximum, this circuit construction of electric power is simple, with low cost, antijamming capability is strong, reliably complete the conversion of supply voltage from+5V to+3.3V, effectively avoid the system failure that power pollution causes.
Description
Technical field
The invention belongs to applied power electronics technical field, particularly relate to a kind of+3.3V power circuit based on LM1117 family chip.
Background technology
The servomechanism that it is core controller that digital servosystem refers to computer (comprising microcontroller chip).Along with the fast development of computer technology, improving constantly of automatic technology, to servomechanism it is also proposed precision higher, respond requirement faster, in addition, managing servomechanism to realize higher controller and to control, also requirement can carry out information exchange with higher controller.These function analog circuits realize both uneconomical, more difficult again.Along with the development of microsystem and relevant control technology, the control precision of digital servosystem, response speed, adaptive capacity to environment are all more outstanding, and volume is little, easy to operate.Meanwhile, microcontroller chip can form various function generator easily, can simulate various nonlinear element in automatic control system exactly, and the quality of control system obtains very large lifting.In addition, when hardware configuration cannot change, the revisable characteristic of software flexible can be utilized to realize different control programs.In summary, digital servo system control system is relative to simulation following control system, and various functions has had obvious improvement, and this also impels all technical of following control system to be greatly improved.So under the prerequisite ensureing reliability, digital servosystem progressively replaces simulating servomechanism in a lot of occasion, and this is the inexorable trend of development in science and technology.So be very necessary to the research of digital servosystem.
Power supply is indispensable important component part in digital servosystem, and the quality of power system design directly determines the success or failure of system.Meanwhile, the pollution of power supply often brings various fault to system.Therefore the high power supply of strong interference immunity, reliability is designed concerning very important raising systematic function.System generally need 7 road power supply: D5V (numeral) ,+3.3V ,+7.5 ,-7.5V ,+3.3V, AVCC5V (simulation) ,-5V.System generally adopts+5V DC power supply or USB line to power, and obtains above various magnitude of voltage respectively by buck or boost mode.System each road voltage needs to be obtained through various boosting, reduction voltage circuit by total input voltage, and conventional power-switching circuit can be divided into LDO linear voltage regulator and DC/DC switching regulator two kinds.
Summary of the invention
The defect existed for above-mentioned prior art and deficiency, the purpose of this utility model is, a kind of+3.3V power circuit based on LM1117 family chip is provided, the circuit construction of electric power that the utility model proposes is simple, with low cost, antijamming capability is strong, reliably complete the conversion of supply voltage from+5V to+3.3V, effectively avoid the system failure that power pollution causes.
In order to realize above-mentioned task, the utility model adopts following technical solution:
Based on a power circuit for LM1117 family chip, it is characterized in that, comprise power supply chip, filter capacitor, capacitance, steady resistance, current-limiting resistance, fuse; Described filter capacitor comprise first, second, the 5th filter capacitor, described steady resistance comprises the first, the 3rd steady resistance, and described capacitance comprises the 3rd, the 4th capacitance, and described current-limiting resistance comprises the second, the 4th current-limiting resistance; The input (1) of described power supply chip (L) is connected with power input (Vin) by fuse (F1), the first steady resistance (R1); First filter capacitor (C1) is connected between power input (Vin) and ground, and the second filter capacitor (C2) is connected between the input (1) of power supply chip (L) and ground; Second current-limiting resistance (R2) is connected with the 3rd capacitance (C3), the upper end of the second current-limiting resistance (R2) is connected with the input (1) of power supply chip (L), and the lower end of the 3rd capacitance (C3) is connected to the ground; The earth terminal (0) of described power supply chip (L) is by the 3rd steady resistance (R3) ground connection, the output (2) of power supply chip (L) is connected with power output end (Vout), and the idle end (3) of power supply chip (L) is connected with output (2); 4th current-limiting resistance (R4) is connected with the 4th capacitance (C4), the upper end of the 4th current-limiting resistance (R4) is connected with the output (2) of power supply chip (L), and the lower end of the 4th capacitance (C4) is connected to the ground; 5th filter capacitor (C5) is connected between the output (2) of power supply chip (L) and ground.
Be somebody's turn to do in the power circuit based on LM1117 family chip, described power input (Vin) connects+5V power supply; Described power supply chip (L) model is the linear voltage regulator of LM1117-3.3; Described first, second, the 5th filter capacitor (C1, C2, C5) select the tantalum electric capacity of 10 μ F/10V; Described the 3rd, the 4th capacitance (C3, C4) selects 220 μ F/25V straight cutting alminium electrolytic condensers; Described first, the 3rd steady resistance (R1, R3) selects 1k Ω semiconductor resistor; Described second, the 4th current-limiting resistance (R2, R4) selects the semiconductor resistor of 100 Ω; 500 milliamperes of fuse F500L250V selected by described fuse (F1).
The invention has the beneficial effects as follows:
A kind of+3.3V power circuit based on LM1117 family chip, use power supply chip, filter capacitor, capacitance, steady resistance, current-limiting resistance, fuse etc., adopt LDO linear voltage-stabilizing circuit that total for+5V input power is reduced to+3.3V, again+3.3V is reduced to 1.2V by LDO linear voltage-stabilizing circuit, for FPGA and related peripherals part are powered.
The input and output voltage difference of LDO linear voltage regulator is lower, and has the feature such as low ripple and low output noise.LDO linear voltage regulator is linked into Switching regulator output, can active power filtering be realized and greatly can improve the precision of voltage regulation of output voltage, do not affect the efficiency of power-supply system simultaneously, suppression ripple voltage can also be played, eliminate the effect [24] of AC noise.Meanwhile, LDO chip area is less, and without the need to the components and parts such as inductance, bulky capacitor, peripheral circuit is also fairly simple, is conducive to simplifying PCB surface and amasss, reduces electromagnetic radiation.Its shortcoming is that conversion efficiency is low, and carrying load ability is more weak, and when input and output voltage pressure reduction is larger, heating is serious.
It is LM1117-3.3, LM1117 series right and wrong low pressure difference linear voltage regulators usually that+5V turns 1.2V circuit LDO linear voltage regulator used, and maximum output current can reach 800mA, can provide stable working power to FPGA.LM1117 series pressurizer can provide current limit and heat protection function.Circuit comprises the band gap reference voltage that 1 Zener regulates, to guarantee that the precision of output voltage is within ± 1%.Input, the output of chip all should add some electric capacity, to ensure stability and the reliability of circuit working.Meanwhile, electric capacity type selecting should be noted that its withstand voltage, preferably reserves enough surpluses.At the input and output side of this voltage conversion circuit, capacitance have employed 220 μ F/25V straight cutting alminium electrolytic condensers, and for isolated DC voltage, coupling, filtering AC signal, by-passing signal etc., ensure that the stability of output voltage.Filter capacitor selects the tantalum electric capacity of 10 μ F/10V, compares electrochemical capacitor, and tantalum electric capacity has lower equivalent series resistance, equivalent series inductance, can obtain transient response speed and better filter effect faster.
This circuit construction of electric power is simple, with low cost, antijamming capability strong, reliably completes the conversion of supply voltage from+5V to+3.3V, effectively avoids the system failure that power pollution causes.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments the utility model is further explained explanation.
Fig. 1 is the structure chart of this 3.3V power circuit, wherein power supply chip (L) linear voltage regulator that is LM1117-3.3; C1, C2, C5 are first, second, the 5th filter capacitor; C3, C4 are the 3rd, the 4th capacitance; R1, R3 are the first, the 3rd steady resistance; Described R2, R4 are the second, the 4th current-limiting resistance; F1 is fuse.
Embodiment
Fig. 1 is the structure chart of this 3.3V power circuit, is made up of power supply chip, filter capacitor, capacitance, steady resistance, current-limiting resistance, fuse etc.; The input (1) of described power supply chip (L) is connected with power input (Vin) by fuse (F1), the first steady resistance (R1); First filter capacitor (C1) is connected between power input (Vin) and ground, and the second filter capacitor (C2) is connected between the input (1) of power supply chip (L) and ground; Second current-limiting resistance (R2) is connected with the 3rd capacitance (C3), the upper end of the second current-limiting resistance (R2) is connected with the input (1) of power supply chip (L), and the lower end of the 3rd capacitance (C3) is connected to the ground; The earth terminal (0) of described power supply chip (L) is by the 3rd steady resistance (R3) ground connection, the output (2) of power supply chip (L) is connected with power output end (Vout), and the idle end (3) of power supply chip (L) is connected with output (2); 4th current-limiting resistance (R4) is connected with the 4th capacitance (C4), the upper end of the 4th current-limiting resistance (R4) is connected with the output (2) of power supply chip (L), and the lower end of the 4th capacitance (C4) is connected to the ground; 5th filter capacitor (C5) is connected between the output (2) of power supply chip (L) and ground; Described power supply chip (L) model is the linear voltage regulator of LM1117-3.3; Described first, second, the 5th filter capacitor (C1, C2, C5) select the tantalum electric capacity of 10 μ F/10V; Described the 3rd, the 4th capacitance (C3, C4) selects 220 μ F/25V straight cutting alminium electrolytic condensers; Described first, the 3rd steady resistance (R1, R3) selects 1k Ω semiconductor resistor; Described second, the 4th current-limiting resistance (R2, R4) selects the semiconductor resistor of 100 Ω; 500 milliamperes of fuse F500L250V selected by described fuse (F1).
The circuit construction of electric power that the utility model proposes is simple, with low cost, antijamming capability strong, reliably completes the conversion of supply voltage from+5V to+3.3V, effectively avoids the system failure that power pollution causes.
Claims (2)
1. based on a power circuit for LM1117 family chip, it is characterized in that, comprise power supply chip, filter capacitor, capacitance, steady resistance, current-limiting resistance, fuse; Described filter capacitor comprise first, second, the 5th filter capacitor, described steady resistance comprises the first, the 3rd steady resistance, and described capacitance comprises the 3rd, the 4th capacitance, and described current-limiting resistance comprises the second, the 4th current-limiting resistance; The input (1) of described power supply chip (L) is connected with power input (Vin) by fuse (F1), the first steady resistance (R1); First filter capacitor (C1) is connected between power input (Vin) and ground, and the second filter capacitor (C2) is connected between the input (1) of power supply chip (L) and ground; Second current-limiting resistance (R2) is connected with the 3rd capacitance (C3), the upper end of the second current-limiting resistance (R2) is connected with the input (1) of power supply chip (L), and the lower end of the 3rd capacitance (C3) is connected to the ground; The earth terminal (0) of described power supply chip (L) is by the 3rd steady resistance (R3) ground connection, the output (2) of power supply chip (L) is connected with power output end (Vout), and the idle end (3) of power supply chip (L) is connected with output (2); 4th current-limiting resistance (R4) is connected with the 4th capacitance (C4), the upper end of the 4th current-limiting resistance (R4) is connected with the output (2) of power supply chip (L), and the lower end of the 4th capacitance (C4) is connected to the ground; 5th filter capacitor (C5) is connected between the output (2) of power supply chip (L) and ground.
2. a kind of power circuit based on LM1117 family chip as claimed in claim 1, it is characterized in that, described power input (Vin) connects+5V power supply; Described power supply chip (L) model is the linear voltage regulator of LM1117-3.3; Described first, second, the 5th filter capacitor (C1, C2, C5) select the tantalum electric capacity of 10 μ F/10V; Described the 3rd, the 4th capacitance (C3, C4) selects 220 μ F/25V straight cutting alminium electrolytic condensers; Described first, the 3rd steady resistance (R1, R3) selects 1k Ω semiconductor resistor; Described second, the 4th current-limiting resistance (R2, R4) selects the semiconductor resistor of 100 Ω; 500 milliamperes of fuse F500L250V selected by described fuse (F1).
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| CN201420504878.4U CN204205943U (en) | 2014-09-03 | 2014-09-03 | A kind of power circuit based on LM1117 family chip |
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| CN201420504878.4U CN204205943U (en) | 2014-09-03 | 2014-09-03 | A kind of power circuit based on LM1117 family chip |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108724193A (en) * | 2018-06-29 | 2018-11-02 | 南京航空航天大学 | A kind of multi-joint bio-robot control system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108724193A (en) * | 2018-06-29 | 2018-11-02 | 南京航空航天大学 | A kind of multi-joint bio-robot control system |
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