51 Research and Design, Electronic Engineers website - Embedded Systems, MCU, DSP, EDA, Test and Measurement, Components, Communications, Power, Microelectronics, Semiconductors

Friday, April 24th, 2009 at 20:00 | No comments

Categories: Power Supply

Tags: Battery charger, PWM controller

Short Content: Abstract: This article introduced produces one kind of new charge component MAX1757 constitution 1~3 lithium ion battery charger's principle of work and the charging-up by MAXIM Corporation, based on this and has given this battery charger's work flow and the parameter establishment; Finally elaborated the PWM controller's principle of work and in the charging-up function briefly. This product already applied in some charge examines in the platform. Key word: Intelligent battery charger; MAX1757; PWM controller  Abstract: This ...

Thursday, April 16th, 2009 at 01:59 | No comments

Categories: Power Supply

Tags: Battery charger

Short Content: 1 lithium battery charge way outline    The commonly used secondary battery has the nickel cadmium cell, the nickel hydrogen battery, the lithium battery and so on many kinds of types. Take at present in the portable digital product the most common lithium battery as the example, the lithium battery has the high energy density, the volume is small, the weight is light, the life is long, non-memory effect as well as pollution of the environment and so on many merits, ...

Wednesday, April 15th, 2009 at 15:59 | No comments

Categories: Power Supply

Tags: Battery charger, hard, Soft switch, Switching power supply

Short Content: Abstract: First introduced the soft switch and the hard switch's elementary knowledge, then gives the electric train accessory power supply newest 10kVA battery charger's main circuit design, introduced and analyzes this kind of new battery charger soft switch to realize the method and the design matters needing attention, this product through national Ministry of Railways's each experiment, moved in official clear Qinghai-Tibet Highway's each new train.Key word: Charge; Soft switch; Hard switch; Accessory power supply 0 introductions    The modern electric ...

Sunday, April 5th, 2009 at 07:08 | No comments

Categories: Power Supply

Tags: Battery charger, connection, handset, overvoltage protection, USB

Short Content: China information industrial department issued "the YD/T 1591-2006 mobile communication handset battery charger and the connection specification and the test method" the standard already enforced, estimated that this action will reduce battery charger's quantity which largely China every year and the new handset sold together, thus reduced the handset overall material cost, and reduced abandons the environmental pollution which the electronic installation brought. The YD/T 1591 standards involve two major parts, respectively is the mobile communication handset side (i.e. ...

Friday, April 3rd, 2009 at 05:08 | No comments

Categories: Power Supply

Tags: Battery charger, Non-Y electric capacity, Transformer

Short Content:    In the switching power supply, the electric current which and the voltage fast change the power component high frequency breakover/shutdown's operation causes produces the high voltage and the electric current peak has the EMI primary cause. Adds the cushion absorbing circuit to be advantageous in reduces EMI, but will have excessively many power losses, will increase the part quantity, the PCB size and the system cost. 　　Usually in the situation, front end the system must add the filtration and ...

Wednesday, March 18th, 2009 at 21:26 | No comments

Categories: Power Supply

Tags: Battery charger, PIC16F676

Short Content: Abstract: Has analyzed the nickel hydrogen battery charge management system management system's design demand, proposed one kind uses the voltage, the temperature and the time carries on the integrated management the charge management plan. Has designed based on the PIC16F676 new flexible charge system, simultaneously has given this system's software and hardware design method.Key word: PIC16F676; Battery; Battery charger        Along with the technical development, are getting more and more to the portable instruments and meters' demand. And designs the ...

Wednesday, March 18th, 2009 at 06:26 | No comments

Categories: Power Supply

Tags: Battery charger, Rechargeable battery, single plane

Short Content: The rechargeable battery already became now the electronic products one kind of standard power source, specially mobile equipment: On notebook, palm navascope, handset and so on. These products need to consume the power is getting bigger and bigger, but may the rechargeable battery capacity rate of rise not be able to meet their need by far. The power loss grows the primary cause is the equipment function enhancement, for example: Digital cameras and handset's function conformity, notebook higher operating speed ...

Monday, February 23rd, 2009 at 14:02 | No comments

Categories: Power Supply

Tags: Battery charger, pipeline clearer

Short Content: Introduction 　　Because the lead-acid battery maintenance is simple, the low in price, the power supply are reliable, the service life is long, widespread achievement automobile, airplane, steamboat and so on motor vehicle or power set's start power source, also, in each kind needs to supply power uninterruptedly the electronic installation and in the portable instruments and meters serves as some electric appliances and control loop's work power source. Along with the economical development, the large capacity accumulator cell's application increases ...

Thursday, February 19th, 2009 at 00:02 | No comments

Categories: Power Supply

Tags: Battery, Battery charger, HPWM

Short Content:     At present, the application quite widespread rapid charge rate management chip basically has two types. One kind is a monolithic integrated circuit, another kind is the rapid charge rate management specific IC. Chengdu country leaps the micro electron Limited company success to develop section of nickel hydrogen/nickel cadmium cell rapid charge rate intelligence management chip - - GM6801. This chip's exterior base pin control function is programmable, does not need the exterior controller support, causes the charging-up examination control ...

Saturday, February 7th, 2009 at 07:53 | No comments

Categories: Power Supply

Tags: Battery charger, counter-violent, LM5021, Portable

Short Content: 1 LM5021 pin function < ?XML:NAMESPACE PREFIX = O />     LM5021 uses SOP-8 and the DIP-8 seal, pin arrangement as shown in Figure 1, each pin's function is as follows:     The COMP:PWM control input end, the COMP end interior meets on a 5kQ resistor to pull to the 5V power source. By output feedback voltage after light pair isolation controls.     VIN: The internal bias electric circuit input end, after this end input voltage achieves the threshold ...