Apr 13

block diagram of voltage regulator

Tiny , 20:15 , Default , Comments(0) , Trackbacks(0) , Reads(181) , Via Original Large | Medium | Small

In the current automotive electronics has become the measure of the international advanced level car under the premise of the important criteria, countries race to develop this industry, the continuous application of high technology to improve the electric performance car, in order to gain a larger market. It is in such an environment to stimulate and promote the automotive industry continues to move forward.
As we all know, poor stability and short life is the common problem of auto voltage regulator, regulator could lead to the instability of the generator output voltage, so that the vehicle electrical equipment, there is a big power supply voltage fluctuations, which on the whole vehicles is detrimental to the normal operation of the circuit, while also reducing power consumption did not prepare for life. Regulator short life will not only bring economic burden on the stability of the generator output voltage is negative.
The voltage regulator into a monolithic CMOS integrated circuit design, thus reducing the volume of the regulator, and alternator so that it can produce together. This will not only enhance the stability of the regulator to improve vehicle quality of power supply, effectively extending the service life of automotive electronic equipment, but also to adapt to the current size of small car alternator output power trends. At the same time the design is also adapted to the current regulator, "high-performance, multi-function, high power, long life," the pursuit of goals.
1 circuit and structure
Automotive regulator block diagram shown in Figure 1.
When the car started to join the input voltage, reference voltage source available to the internal reference voltage generating circuit; error amplifier receiving the output voltage signal; over-current protection circuit output current of power tube sampling; thermal protection circuit check circuit temperature; error amplifier, over- current protection and thermal protection safety zone together into the power tube circuit, when one of them as long as there is an unusual phenomenon, the regulator will be turned off, played to adjust the voltage and protection.
2 Circuit Design
2.1 front-end reference
The design of the chip front-end reference voltage circuit to provide a source of the power supply voltage and temperature are very stable in terms of follow-up reference voltage to the differential comparator circuit for comparing the difference with the sampling circuit output voltage from the generator compared to control the generator output, the circuit shown in Figure 2. Figure 2, M1, M2, M5 form current mirror, so that current flow through the three are equal, all I; M3, M4 formed voltage clamp circuit, so that A, B two voltage consistent. Mirror current source and voltage clamp circuit together form a PTAT source, with its positive temperature coefficient to compensate for the negative temperature coefficient of PN junction, resulting in essentially no change in reference voltage with temperature.
2.2 The differential comparator circuit
Differential comparator function is to control circuit voltage reference from the front-end reference voltage and the voltage generator to compare samples. When the generator output voltage below 14 V, the field current regulator to work properly, flow through the generator rotor winding excitation current rapid increase in generator output voltage is rapidly increased. When the generator output voltage reaches 14 V, the differential output voltage sufficient to drive the subsequent adjustment of the excitation current control circuit controls the gate control ground, its gate current points away, reducing the generator stator winding excitation current action, which reduces the power machine output voltage reaches the voltage regulation function. The circuit shown in Figure 3.
block diagram of voltage regulator

Output ripple voltage of the alternator has a more straight DC voltage pulse, shown in Figure 2 u. Figure 2 shows the three-phase full-wave rectified waveform and ABc overlapped each phase output waveform, is clear that the peak of the pulse of the mediums is the average voltage. Alternator alternator output voltage proportional to the induced electromotive force E, the induced emf E is proportional to the flux per pole and the generator speed, l 'is: E,. CE = Cr in, l so. When the generator speed n changes, corresponding changes in the magnetic circular per pole to achieve the purpose of maintaining the voltage constant, and each very much depends on the flux in the generator field winding current size, so the change in speed, as long as the automatic adjustment of the generator field winding current of the generator output voltage can be kept constant. Voltage regulator is to use the principle of generator voltage regulator. Voltage regulator works as a logical network 3 Gang box below. Alternator load and speed changes, etc. will cause the output voltage changes. Voltage regulator is off through the field winding current, adjust the excitation flux to compensate for the change, so that it can maintain the rating allows for fluctuations within the For example,   3.5%. 12V on all the systems. Generator power to the load requirements to maintain generator output voltage is 14v output characteristics, often used (13.5 ~ 14.5) V the voltage. If indiscriminately 4 shows, the voltage regulator is excitation current control to regulate the output voltage changes. However, even after the generator is rectified, "30, a cover 20 removed to find j leave 10O voltage regulator block diagram of Figure 3, n110" 120304050   100n (r / mirll Figure 4 straight generator power to the load curve of the DC output The role of regulators to make the actual output waveform shown in Figure 2. electromagnetic vibration mechanical voltage regulator, except bulky, contact Easy ablation, magnetic and mechanical inertia of inertia, the fatal drawback is that the output ripple voltage pulse peak amplitude large. To address and overcome these shortcomings. using non-contact, non-magnetic high-speed switching inertia and mechanical inertia of the electronic voltage regulator to reduce output ripple voltage alternator pulse peak amplitude. Figure 5 electronic voltage regulator Schematic electronic excitation coil voltage regulator basic circuit shown in Figure 5. When the AC generator speed to accelerate, the output value is higher than the default value. then connected through the hurricane transistors T: base, allowing all the excitation current is passed. Thus the output voltage to increase. when it reaches the preset voltage, the voltage regulator diode D. to turn, R. / R: is a simple voltage divider used to set the voltage for the diode. assumptions for voltage is 14.0V, the diode turns on, transistor T. turn, this product transistor T: on the Ground of the, T: is off, the magnetizing current will be cut off, the output voltage will drop. This in turn will diode D. stop conduction, T. deadline, T: another turn. so keep T as a switch, the diode absorbs the magnetic field from the excitation coil back EMF. ignored the plot is now widely used 6 IC (1c) voltage regulator circuit. with coating technology, will gather in a porcelain of different components, the core control part of an integrated circuit, the output common Darlington. While the overall principle and power regulator IC voltage regulator in Figure 6 Principle Figure 55 *
Bobby
2013/05/04 13:47
the theory of integrated voltage limiters is very elementary. between the input and . abstract: a typical block diagram showing the power path in a basic power supply for .
Adonis
2013/05/12 17:20
integrated voltage limiters for automotive applications - maxim
Franklin
2013/05/12 18:57
power supply block diagram. power supply block diagram with voltage regulator. zener diode . zener diode as voltage regulator (unloaded) consider the operation of .
Nigel
2013/05/17 02:57
lesson 35: zener diodes
Rodney
2013/05/17 09:47
can mean the collection of different voltage regulators that supply many different voltages . show the typical average current of the block during talk time and the typical .
Vic
2013/05/21 03:34
http://www.commsdesign.com/printablearticle/;jsessionid=14uycb0
Jared
2013/06/04 05:59
the function of the voltage regulator is to maintain. if the reason for switching modes . voltage regulator. figure 1-43.-voltage regulator, block diagram. 1 .
Denise
2013/06/10 07:58
figure 1-43.-voltage regulator, block diagram.
Burnell
2013/06/12 09:30
austriamicrosystems introduces a 400ma low input voltage ultra-low-dropout regulator (ldo) with a minimum input voltage of 1.2v.
Isabel
2013/06/18 20:56
as1371- low input voltage low drop out regulator (ldo .
Meredith
2013/06/24 06:26
a voltage regulator includes an input terminal for receiving a power input having a first . 2 illustrates a block diagram showing a voltage regulator in accordance with some .
Isaac
2013/07/12 16:26
self-referencing voltage regulator
Myron
2013/07/13 09:04
provided is a voltage regulator in which a rush current of an output circuit can be limited and a rise time of an output voltage is short. the voltage regulator
Constance
2013/08/25 23:07
voltage regulator - us7511464
Cherie
2013/08/31 21:37
the block diagram of our first example, the isl12026 is shown in . the block diagram of our second example uses the isl6002 to provide a voltage reference.
Jocelyn
2013/09/19 12:55
embedded.com - choosing and using bypass capacitors (part 3 of 3)
April
2013/09/24 20:01
see the wiring diagram above ("rough schematic of engine wiring") for . alternator with external voltage regulator. this wiring diagram is courtesy of "speedy jim, .
Dave
2013/10/04 09:22
alternator wiring
Helen
2013/10/08 08:26
a device comprises an active-pull-up stage and an active-pull-down stage. the device receives at least one reference voltage and provides an regulated output
Neil
2013/10/24 14:16
voltage regulator - us7265607
Judith
2013/10/25 20:17
the output of the voltage regulator must have the same electrical characteristics. as a . this basic system is shown in the block diagram of figure 6-1.
Nigel
2013/10/30 02:32
ch. 6 - chargers & voltage regulators (332kb)
Helen
2013/11/01 01:07
the dropout operation of the standby regulator is maintained down to 3 v input supply voltage. the block circuit diagram of the reset circuit is shown in figure 6.
Madge
2013/11/07 08:00
stmicroelectronics | very low drop voltage regulator - l4925
Ben
2013/11/08 17:01
osev block diagram. page 1 of 1. june 19, 2009. chris jones. legend: high . voltage regulator, microcontroller, can. transceiver, adc, dacs, amplifiers, power .
Tammy
2013/11/12 06:14
osev block diagram
Nelson
2013/11/13 02:22
switching voltage regulators work by periodically storing energy in the magnetic field of . the output voltage as a function of duty cycle is shown in the diagram, and may .
Tommy
2013/11/20 21:35
switching regulator overview
Pearl
2013/11/22 01:00
figure 1. block diagram of the 3-terminal series voltage reference. design equations for . figure 2. block diagram of the 2-terminal shunt voltage reference.
Reg
2013/11/24 11:16
series or shunt voltage reference? - maxim
Alston
2013/11/24 22:21
application block diagrams. switching regulator simulator. package . is there a way to prevent the output voltage from increasing at low current load? .
Bob
2013/12/05 17:47
faq - voltage regulators
Mick
2013/12/08 05:27
1.0 given a block diagram, describe the operation of a typical voltage regulator. 1.2 given a block diagram of a typical voltage regulator, describe the function of each .
Josie
2013/12/11 19:34
module 11 voltage regulators
Olga
2013/12/15 04:12
a short tutorial on how automotive alternators and ac to dc charging systems work. the regulator uses the control voltage input to control the amount of field current input .
Margaret
2013/12/22 05:05
understanding alternators, how alternators work
Mignon
2013/12/22 08:15
voltage regulator. the voltage regulator uses an isolated collector vertical pnp . the block circuit diagram of the reset circuit is shown in figure 7.
Eleanore
2013/12/25 00:08
stmicroelectronics | multifunction very low drop voltage .
Aaron
2013/12/28 09:25
the voltage regulator circuit gets the +12 v voltage present on the . block diagram of a pwm controller usually found on the cpu voltage regulator .
Bevis
2014/01/01 12:00
everything you need to know about the motherboard voltage .
Antonia
2014/01/01 14:07
regulator provides an output voltage of 5.3 v at room temperature and can supply . block diagram of linear voltage. regulator in figure 2. 2. 2. 1. 2. k. n. v. r .
Lon
2014/01/01 17:12
a high-temperature, high-voltage linear regulator in 0.8-um .
Gawen
2014/01/02 15:44
here's a simplified block diagram of a standard linear regulator, from national semiconductor's application . op-amp, a couple of transistors, a voltage reference, and a few .
Cleveland
2014/01/25 20:16
op-amp based linear regulators
Heidiadalheid
2014/01/27 08:43
a leading designer and manufacturer of high performance analog solutions . the as1360 low-power, positive voltage regulator was designed to deliver up to 250ma .
Madeline
2014/02/05 11:41
as1360 / ldos / power management / products / home .
Adelaide
2014/02/08 16:31
voltage regulator. low noise front ends. mics low noise front end . this block diagram depicts a typical circuit design for ground-based radar systems.
Ira
2014/02/18 03:43
block diagrams
Maureen
2014/02/18 23:55
the regulator is active, providing the nominal supply voltage of 2.5v . shows the function principle of vreg_3v3 by means of a block diagram.
Regina
2014/02/19 17:04
vreg_3v3 block user guide v02.04
Aaron
2014/02/22 20:23
μf or more, and a voltage detector that monitors the output/input voltage of the regulator. the block diagram of the regulator block is shown below.
Natalie
2014/03/02 02:21
data sheet (pdf)
Hugo
2014/03/06 10:08
you knew the alternator voltage regulator would stop working again so you would replace it at your earliest . figure 6: basic block diagram of an alternator voltage regulator .
Hiram
2014/03/10 01:11
embedded.com - designing a microcontroller-driven alternator .
Blake
2014/03/10 06:48
voltage detectors. voltage regulators. switching regulators (dc-dc . application block diagrams. technical support. switching regulator simulator. package .
Quincy
2014/03/11 21:59
sii ic sitemap, voltage detector, switching regulator .
Lucy
2014/03/23 01:22
voltage of the internal power supply in which power is shut down is generated from voltage of an external power supply by using a regulator circuit.
Katherleen
2014/03/23 01:42
semiconductor device - patent application - capable of .
Rosa
2014/04/01 09:57
a typical analog voltage regulator is illustrated in the block diagram above and incorporates the following: . field of which is excited by the voltage regulator, so that the .
Elwin
2014/04/07 19:40
generator voltage regulation functional block diagram
Add a comment

Nickname

Site URI

Email

:
Enable HTML Enable UBB Enable Emots Hidden Remember [Login] [Register]