Technology News

1. At present, mobile phone chargers can be divided into single slot shape and Dual Chamber of chargers, chargers are being single-channel two-channel attacks. Two-channel charger in addition to slow charge, fast charge, discharge and nickel-cadmium, nickel-hydrogen laptop battery and charge a standard feature, there are some products with automatic temperature control and voltage control, to prevent the filling of new features, thus consumption Who should be inclined to choose Dual Chamber of chargers.

     2. With the increasing variety of mobile phones, various models for different chargers, power is not the size of the same port, which can not be used interchangeably, has brought inconvenience to consumers. Standard charger is that you can connect all the phone at the bottom outlet (port) of the charger pavilion battery. Moreover, the production of mobile power for the port will apply to the unified standard charger specifications. In this way, consumers will not have to phone each other at the same time to buy a new charger. Thus, from the sit-in charger to the portable, such as the development of Dual Chamber at the same time, also began to standardize the general direction of development.

     3. Standby power consumption of mobile phone chargers to reduce gradually become the Chargers in the design process an important part. Compared to the previous chargers, the future production of the products will improve the function at the same time further reducing its own standby power consumption F2024A . In order to achieve this objective, can design a judgement whether the AC adapter connected load (phone) IC, when not connected load, the AC adapter DC output side (two circuits) switch to high-impedance circuits. This measure can be adopted to substantially reduce standby consumption of two circuit current (can reach tens of μ A). In addition, the exchange can also enter the 100 V (a circuit) circuit in the switch settings. Not connected load, through the switch circuit to reduce supply to the DC output side (two circuits), thereby reducing power consumption.

     4. Now on the market most of the charger, only lithium batteries or nickel-hydrogen batteries, but with the development of the market, automatic identification of two F2024B  charging and the corresponding process of the charger is gradually occupy the mainstream. Can automatically distinguish between lithium batteries or nickel-hydrogen battery Zuochong can “to prevent the discharge of lithium wrong moves” if the rechargeable lithium battery when not carefully Zuochong according to the “release button,” can identify good Zuochong is out Lithium batteries, it will not do discharge movements of the poor while不管三七二十一Zuochong conduct discharge, which will result in the impairment of lithium F2299A life.

In many automotive systems, the monitor is an important function of monitoring the battery voltage to the laptop battery voltage circuit to maintain the system within the acceptable scope of work. Monitor can monitor the input from two sides: the internal or external adjustment settings. Built-in threshold will allow users to directly control input pins with the monitoring of the power link, without any external components. However, the monitoring threshold must choose built-in form. These choices are often based on the almost standard logic supply (5 V below) and therefore are often not suitable for battery monitoring. In addition, if the control input pin directly connected to the battery, it must withstand 60 V peak voltage.

For these reasons, adjustable external input is usually a better choice. Enter the adjustment of fixed threshold is relatively low, at around 0.5 V, but it is high impedance input, it can be monitored with the power to connect a resistor divider pavilion battery. The divider of these resistors can be set in any high voltage monitoring threshold. External divider also provides a flexible, and that is devoted to the study of the system (for example: regardless of the minimum working voltage to 9.5 V or only up to 10 V) to match the power to choose an acceptable range. Divider in the more protected the resistance will monitor the importation of its load dump or other abnormal conditions of the incident from the impact of current damage.

Batteries may need to monitor the importation of over-voltage F2024B  detection or under-voltage conditions. In both cases very easily, and will weaken the function of the system. The basic monitor is often only available under-voltage monitoring. If the pressure monitoring threshold set up independent of the under-voltage threshold, the two independent adjustable resistor divider external input is usually to be used to detect under-voltage or over-voltage. Even in normal operation, the vehicle power supply may also have a large number of high-frequency components, such as when they come from at-fault for the wiper motor and load, such as car headlights, alternator output generated by the ripple and various forms of EMI. Monitor treatment in the form of high-frequency content can seriously affect the effectiveness of the monitor. For example, the scope of work close to the edge of the AC generator power supply ripple is undesirable, because it could lead to thousands of microprocessor reset pin-hyuk of frequency hopping. To some extent, the use of monitoring the retardation threshold can solve this problem. This is often not an ideal solution, because retardation threshold accuracy equivalent to the decline, which will shorten the start-up time or to relax the components of the scope of power.

Bellows also available through reduction of overtime to ease the way, this is often the monitor. When a F2299A  power supply from outside the scope of work to convert the scope of the work at the power good instructions before the Monitor will wait for a period of the scheduled time. If the power in the overtime period of any de facto again from the scope of work, overtime will be reset, and the next voltage to re-enter the work began. Timer can be avoided from the output of high-frequency than any of the overtime. On the other hand, the timer can also cycle through overtime and delayed the start-up and recovery system, in order to achieve a balance must be on the power play and the characteristics of the microprocessor. Some monitors can be provided to adjust the overtime period, in order to achieve a given system optimization of the compromise, while others were from the factory-programmed and fixed overtime (normally 200 ms), which can save users external components of the set-up time.

Finally, the majority of modules will continue through short-term transient voltage in more than their normal scope of work under the conditions of work, which mainly depend on local supply bypass capacitor. In addition, the acceptability of this transient period with the amplitude often change. For example, a Pavilion DV1000 battery system may have to 2 V interference in the operation under the conditions of 50 s, or 1 V interference in the running 100 s. For this reason, many monitors can provide some input interference filters, in response to interference in the energy supply, not just its amplitude.

    The last two months suddenly ultra-low power circuit from the interest, just two days before the company has a small project, the need to design a 1.5 v battery boost circuit. Output to 3.3 v 100MA. Of course, boost the election integrated circuit DC / DC Rafah, the external components  more less more best . Mind immediately thought of MAXIM, MAXIM fact, there are several things kind of performance in the industry is really good. Samples of applications is also extremely convenient. I chose a MAX1674, the importation of 1.1 to 5.5 v, output 3.3 v, no-load current is about 16 uA, performance or very good manner. Samples of hand immediately thermal transfer. After the actual measurement, 1.55 v input voltage unladen 60 uA, SHDN model 10 uA, 10uA appears to be tantalum capacitor leakage, it is the no-load current 50 uA, or very large (I think, in fact DC / DC chips now This is the manufacturing level). Circuit decided to increase it to be transformed. To make no-load current of less than 3 uA

Consider the characteristics of resistance is the most effective way to study signal transmission along the transmission line when the signal itself to see what. To simplify the discussion purposes, assume that laptop battery transmission line for the microwave transmission band (microstrip) type, and signal transmission lines spread along the transmission line when the entire cross-section of the line.

The transmission line to join the range of 1 V step signal. Step 1 V is a signal of the batteries, access by the front end, connected in the signal path between the lines and return. Connected to the inspiron battery in the moment, the signal voltage of electricity will be the speed of light in the medium of the road, speed is usually about six inches / ns (signal why the road so quickly, but not nearly the speed of electronic dissemination of about 1 cm / s, this is another topic , Not further described here). Of course, here the signal still has a conventional definition, the definition signal for the signal lines and access roads to return to the voltage difference, always by measuring the transmission line with the approach of any of the signal to return to the voltage difference between the access road to get.

Signal transmission lines along the direction to six inches / ns the forward speed of transmission. In the process of signal transmission will encounter any kind of situation? » In the beginning of the 10 ps time intervals Inspiron 6000 battery , signal transmission lines along the road direction of the 0.06 inches the distance. The assumption that time locked in this moment, to consider the situation of transmission lines. This section of road in the distance, the signal transmission for this section of transmission line and the corresponding approaches the signal to return to a stable channel established between the rate of 1 V to the constant signal. This means that this section of the road in the transmission line and the corresponding return to the path has been the accumulation of additional positive charge and the additional negative charge to create the stable voltage. It is precisely these differences in charge between the two conductors to establish and maintain a stable 1 V voltage signal, and the conductor of the voltage stability between the two conductors on the signal has been established between a capacitor.

Transmission lines at this moment before the waves behind the signal transmission line is not clear signal to be transmitted over Inspiron 700m battery , thus remain with the return signal pathway between the voltage to zero. In the next 10 ps time intervals, signal transmission lines along the road will be a certain distance, continue to spread the signal will result in another 0.06 inches for the length of the transmission line with the corresponding signal to return to establish a pathway between the 1 V Signal voltage. To achieve this, the need for the signal line into a certain amount of positive charge, as well as the return signal pathway into an equal number of negative charge. Signal transmission lines along the dissemination of 0.06 inches each in length, there will be more positive charge into the signal line, there will be more negative charge into the return signal pathway. Every 10 ps time interval, there will be another section of transmission line was charging to 1 V, will also signal transmission lines along the forward direction to continue to spread.

These charges come from » The answer is from the signal source, that is, we used to provide step-signal transmission line connecting in front of the Inspiron 5100 battery . With the signal transmission lines of communication, the signal for transmission through the transmission line charge to ensure that the process of signal transmission lines and went back to signal path between the establishment and maintenance from 1 V voltage. Every 10 ps time interval, signal transmission lines in the dissemination of certain distance from the power supply system and learn a certain amount of charge δ Q. Battery for a period of time interval δ t in the field to provide a certain amount of charge δ Q, formed a constant on the current signal. Is the current signal from the battery into the line, while the same size of the negative current will flow through the return signal path.

Access road running through a negative signal to return to current signal into line with the current size is exactly the same Inspiron 8200 battery. Moreover, in the position before the wave signal, AC current flows through the line by the signal pathway and signal a return to the capacitor, completed a signal loop.

PMP or smart phones in the use of hard disk drives to promote a key factor is the need for large capacity and easy to read / write to the compact storage media. To PMP as an example, it can usually from the AC adapter, USB cable or lithium-ion laptop battery-powered; However, for these power between the power path management is a challenging technical problems.

DC / DC converters Another common problem is, how wide input voltage range under one in the scope of the regulated output. To help more clearly explained this issue, we are to adopt the 3.3 V power rail, from a single lithium-ion inspiron laptop battery-powered PMP as an example. When using a conventional lithium - cobalt oxide cathode battery, its discharge voltage from 4.2 V to 3.0 V. However, the system needs a power rail of 3.3 V fixed output. Thus, the output voltage may sometimes be higher, lower or in a lithium-ion battery input voltage range.

To solve such problems is the traditional method of using single-ended primary inductance converter (SEPIC), or to use buck / boost converter. Whether the input voltage above, below or equal to the output voltage, this converter will provide a fixed output voltage. However, in a SEPIC converter, there are some major shortcomings Inspiron 8100 battery:

● because of the need to use a number of large bulky inductor or transformer, which led to the design of the complex;
● control loop is very complicated, but in lithium-ion Inspiron 4000 battery applications common wide input voltage range of conditions difficult to achieve stability;
● solution footprint, but also difficult;
● conversion efficiency low, usually around 75 percent to 80 percent more;
● at a higher output power levels will be under the conditions of overheating problems.

A more effective method is a single-inductor-type converters, such converter control through four internal switch to achieve the buck, boost and 100 percent duty cycle work. This four switch buck - boost Inspiron 600m battery converter has the advantage of easy to design, high-power density, and because of a synchronous drive capability, but also to the efficient work.