1, capacitor charging principle When the capacitor is connected to the DC voltage source, the capacitor will be charged, as shown in Figure 1. FIG. 1a) capacitor notAre charged, so plates A and B have an equal number of free electrons. When the switch is closed, as shown in FIG. 1b), the power supply moves the free electrons from plate A through the circuit to plate B, as indicated by the arrow in the figure.
2, LED3 as to be charged, saturated, trickle charging triple indication. Polarity recognition circuit. This section consists of R12 and LEDl (TEST red polarity indicator). The protection circuit is composed of Q3 and R7 and other components. Let's say the battery's polarity is reversed. LED1 will light up, warning should switch the switch K, in order to charge normally.
3. The principle circuit diagram of the mobile phone charging bank is as follows: 1MS in the figure is a toggle switch: dial up for lighting. The middle gear is the lighting disconnect position and the charging position, and the charging output and power lamp are downward for the charger. LED4 ~ LED7 are high brightness emitting diodes used as lighting. LED2 green LED as battery charging indicator. LED3 is used for power monitoring indication and lighting when charging with mains electricity.
4, mobile phone charger circuit diagram and schematic diagram: the circuit is mainly composed of oscillation circuit, charging circuit, voltage protection circuit, etc., its input voltage AC220V, 50/60Hz, 40mA, output voltage DC2V, output current in 150mA~180mA. Before charging, first connect the battery to be charged, and see if the test light on the charger panel is on. If the light is on, the polarity is correct and the power can be switched on to charge. VDQ1 and other components constitute the voltage regulator.
5, the commonly used electric vehicle charger can be roughly divided into two kinds according to the circuit structure. The control chip of the first charger is generally TL494 as the core, which promotes two 13007 high-voltage triodes. With LM324 (4 operational amplifiers), three-stage charging is realized. There is also a uThe c3842 drives the single-tube switching power supply of the FET, and works with the LM358 dual operational amps to realize the three-stage charging mode. Circuit principle According to the physical mapping of Jiateng brand charger circuit principle is shown in Figure 1.
6, mobile phone charger circuit and schematic diagram: the circuit is mainly composed of oscillation circuit, charging circuit, voltage protection circuit, etc., its input voltage AC220V, 50/60Hz, 40mA, output voltage DC2V, output current in 150mA~180mA. Before charging, first connect the battery to be charged, and see if the test light on the charger panel is on. Ruoliang, indicates that the polarity is correct and can be connected to the power supply for charging.
1, home choose Canon inkjet printer home use, there is no right file to deal with, choose Canon inkjet printer is more suitable. Canon's color inkjet prints at 25 sheets per minute, which is much faster than HP's. In terms of price, Canon color inkjet printers sell for about 200 yuan. Is a lot of homesThe court can accept the price.
2. For laser printers, users who pay attention to complete functions and cost-effective can choose Bento M6208W/P3022DWS/M7160DW and other models. The HP 126NW embodies the dual advantages of technology and price with its number one sales for many consecutive years, while the M232dw's automatic double-sided and wireless capabilities make it more practical. For economical printing needs, Meow machine P2 has become an ideal choice for error printing at a price of about 200 yuan.
3, Canon printer home which model is good Canon MX728 CanonThe MX728 printer is a series of printers with both printing and fax functions. This printer has the function of wireless printing, but also can realize automatic double-sided printing; The appearance of the new piano black box design, placed in any location in the home is a beautiful scenery.
4, HP printer as a well-known electronic brand, its printer products are mainly positioned in the middle and low-end market. These printers typically respond quickly, consume low power, and have a high market share. The relatively low cost of replacing cartridges makes them excellent in terms of cost performance. Canon printer Canon
1, HP IPM17-TP Z170 motherboard The motherboard is Z170 chip, 1151 CPU interface, with HDMI two interfaces, the motherboard supports USB3 and SATA3. The most special is that the motherboard also has two M.2 ports, which can plug in an M.2 WIFI network card and an M.2 SSD hard disk at the same time. Let your computer go crazy. This board is brand new stock and has not been used. No packaging and accessories, a box of 12 pieces of packaging!!With a file.
2, basically can not be used, you are the old motherboard of LGA775, G41 is the best model in the LGA775 interface, the general memory maximum support DDR3 1333, DDR3 1600 is the new stripes, the ICH7 chipset compatibility is very bad, or you can be compatible with 1600, But it automatically drops to 1333, which makes no sense, or the blue disc is incompatible.
3, because the router is logged in through the web, so your computer must be installed browser, I use 175 hereBrowser, of course, you must also know your own router login address and login account password, otherwise you can not log in, as shown in the 175 browser address bar enter your login address, enter the router account password in the pop-up window.
1, the main circuit of the inverter can be divided into two categories: voltage type is the voltage source of the DC conversion to AC inverter, DC circuit filter is capacitance; The current mode is a converter that converts the DC of the current source into AC, and the DC loop filter is the inductor.
2, the frequency converter is used to change the frequency and amplitude of the AC motor power supply, so as to change the period of its moving magnetic field, to achieve the purpose of smooth control of the motor speed. The emergence of frequency converter makes the complicated speed control simple, and the combination of frequency converter and AC squirrel cage induction motor replaces most of the work that can only be completed by DC motor, reduces the volume, reduces the maintenance rate, and makes the transmission technology develop to a new stage.
3, inverter is a power electronic device, mainly used to change the frequency of alternating current, detailed as follows: Working principle: inverter is mainly composed of rectifiers, filters, inverters andThe controller is composed. The rectifier converts the input alternating current into direct current, which is then smoothed by a filter. The inverter converts the smoothed direct current back to alternating current, but the frequency can be adjusted by a controller.
4, Variable frequencyDrive (VFD) is the application of frequency conversion technology and microelectronics technology, by changing the motor working power supply frequency to control AC motor power control equipment. It is mainly composed of rectifier, filter, inverter, brake unit, drive unit, detection unit and micro-processing unit. Frequency converter yuveryMany protection functions, such as over current, over voltage, overload protection, etc.
5, frequency converter is the application of frequency conversion technology and microelectronics technology, by changing the motor working power supply frequency to control the AC motor power control equipment. Frequency by the internal IGBT to adjust the output power supply voltage and frequency, according to the actual needs of the motor to provide the required power supply voltage, and then achieve the purpose of energy saving, speed regulation, in addition, the inverter has a lot of protection functions, such as over current, over voltage, overload protection and so on.
6, the frequency converter is the application of frequency conversion technology and microelectronics technology, by changing the motorA power control device used as a power supply frequency to control an AC motor. The inverter is mainly composed of rectifier (AC to DC), filter, inverter (DC to AC), brake unit, drive unit, detection unit and micro-processing unit.
1, A-share listed companies semiconductor driver chip leading stock crystal Fengmingyuan is currently in A structuralRising trend, volatility structure is relatively stable, according to big data statistics, the main chip is about 68%, the main control ratio is about 748%; Trend research can use the combination of 20-day moving average and 30-day moving average to take the 30-day moving average as a long-short reference. 2, Take semiconductor chip stocks as an example, data show that the chip index rose 292% in the second week of May, the next week after a slight adjustment will open a wave of sharp rise. In the past month, the chip index has risen by 2445%. In this regard, the GF fund believes that in the short term, the shortage of stock prices under the imbalance of supply and demand in the semiconductor industry will benefit domestic semiconductor factoriesBusiness, the industry boom is high; In the long run, leading companies may offer better investment value.
3, photovoltaic industry single crystal furnace leader, the third generation of semiconductor chip equipment dark horse stock, stable growth of performance At present, the third generation of semiconductors compared to the first generation, the second generation of materials is relatively excellent, and the third generation of semiconductors and foreign gap is relatively small, so the country hopes to put the third generation of semiconductors mentioned the height of the 14th Five-Year strategy, while the market has the view that, The third generation of semiconductors is expected to become an overtaking opportunity in the development curve of China's semiconductor industry.