DC power supply, also known as DC r

DC power supply, also known as DC regulator. It's mostly an alternating voltage supply voltage when the output voltage or load resistance AC power supply voltage, direct output voltage regulator can maintain stability. The voltage regulator parameters stability, ripple coefficient and response speed. The former indicates input voltage variation on the output voltage. Ripple factor expressed in nominal operating conditions, the size of the output voltage of the AC component; the latter represents the input voltage or load changes abruptly, the voltage returns to normal time required. DC power supply continuous conductivity type and sub-type switch categories. The former by the frequency transformer single-phase or three-phase AC voltage is changed to the appropriate value, and then rectified, filtered to obtain unstable DC power supply, and then the voltage regulator circuit to obtain a stable voltage (or current). This power line is simple, small ripple, mutual interference, but the volume is large, supplies and more inefficient (often less than 40% to 60%). The latter change adjustment element (or switch) off time than to regulate the output voltage to reach regulation. Such small power consumption, efficiency up to 85%, but the drawback is the large ripple, large mutual interference. Therefore, the rapid development since the 1980s. From the work can be divided into: ① controlled rectifier. By changing the thyristor conduction time to adjust the output voltage. ② Chopper. Input DC voltage is unstable, to change the switch circuit off than getting a one-way pulsating DC, and then filtered to obtain a stable DC voltage. ③ transformer type. First by the unstable DC voltage inverter converts high-frequency alternating current, and then by the transformer, rectifier, filter, resulting from new DC output voltage sampling, feedback control of the inverter frequency, to stabilize the output DC voltage.
5.5 temperature sensing circuit
5.5.1 Analysis of temperature detection program
Because ultrasound is also part of the speed of sound, so in the transmission path will be affected by external factors such as temperature, in order to obtain more precise distance between the sensor and the surface, the temperature sensor detects ambient temperature conditions at the time, and converted to the corresponding the ultrasonic velocity using this rate to calculate the distance you can get more accurate distance. So adding a temperature sensor in the whole system to detect the temperature of the prevailing circumstances.
5.5.2 Introduction to digital temperature sensor DS18B20
DS18B20 American DALLAS company launched a single-bus digital temperature chip [8]. He has a unique single bus interface mode, only use one port will be able to achieve two-way communication with the MCU. Digital signal outputs the signal to improve noise immunity and temperature measurement accuracy. His wide operating voltage range (3.0 ~ 5.5 V), you can use an external power supply, can also be used parasitic power mode, that is, when the bus DQ is high, the signal energy to steal DS18B20 supply. He also negative features, power polarity reverse, DS18B20 will not pick the wrong line and burned, but does not work. It can be programmed to achieve the 9 to 12-bit conversion accuracy temperature setting. Setting higher the resolution, the required temperature data conversion time longer, in practical applications to the resolution and conversion time tradeoff.
5.5.3 DS18B20 structure and circuit
DS18B20 with 3 feet T0-92 package, shaped like a transistor, but also 8-pin SOIC package, as well as 6 feet TSOC package. Temperature range of -55 ~ + 125 ℃, in the range of -10 ~ 85 ℃, an accuracy of ± 0.5 ℃. Each DS18B20 chip ROM is stored in a 64-bit ID number: 8 before the product type number, followed by 48 of the device itself is serial number of the last eight in front 56 cyclic redundancy check code. Because of its parasitic power mode power supply can be used. Thus, it can also mount on a bus with multiple DS18B20, multi-point temperature measurement system.

結果 (中文) 1:

直流电源供应器，也称为直流稳压器。大多是交变的电压电源电压时的输出电压或负载电阻交流电源供电电压，直接输出电压调节器可以维持稳定。电压调节器参数稳定、 纹波系数和响应速度。前者表示输入的电压变化对输出电压。纹波系数表示在额定工况下，输出电压的交流分量; 大小后者突然表示输入的电压或负载变化，电压返回到所需的正常时间。直流电源连续电导率类型和子类型切换类别。前者由工频变压器单相或三相交流电压是更改为适当的值，然后纠正，筛选获得不稳定直流电源供应器，然后电压调节器电路以获得稳定的电压 （或电流）。此电源线是简单、 小波纹、 相互干扰，但体积大，用品和效率越低 （通常小于 40%至 60%)。后者的变化调整元素 （或交换机） 关闭时间比来调节输出电压，达到调节。这种小功率消耗，效率达 85%，但缺点是大纹波，大型的相互干扰。因此，自 20 世纪 80 年代以来的快速发展。从工作可分为 ︰ ① 控制整流器。通过改变晶闸管导通时间来调节输出电压。② 斩波器。输入直流电压不稳定，若要更改开关电路比单向脉动直流，然后再过滤以获得稳定的直流电压。③ 变压器类型。首先由不稳定的直流电压型逆变器转换的高频交变电流，然后由变压器、 整流、 滤波，引起新的直流输出电压采样、 反馈控制的逆变频率，来稳定输出直流电压。5.5 temperature sensing circuit5.5.1 Analysis of temperature detection programBecause ultrasound is also part of the speed of sound, so in the transmission path will be affected by external factors such as temperature, in order to obtain more precise distance between the sensor and the surface, the temperature sensor detects ambient temperature conditions at the time, and converted to the corresponding the ultrasonic velocity using this rate to calculate the distance you can get more accurate distance. So adding a temperature sensor in the whole system to detect the temperature of the prevailing circumstances.5.5.2 Introduction to digital temperature sensor DS18B20DS18B20 American DALLAS company launched a single-bus digital temperature chip [8]. He has a unique single bus interface mode, only use one port will be able to achieve two-way communication with the MCU. Digital signal outputs the signal to improve noise immunity and temperature measurement accuracy. His wide operating voltage range (3.0 ~ 5.5 V), you can use an external power supply, can also be used parasitic power mode, that is, when the bus DQ is high, the signal energy to steal DS18B20 supply. He also negative features, power polarity reverse, DS18B20 will not pick the wrong line and burned, but does not work. It can be programmed to achieve the 9 to 12-bit conversion accuracy temperature setting. Setting higher the resolution, the required temperature data conversion time longer, in practical applications to the resolution and conversion time tradeoff.5.5.3 DS18B20 structure and circuitDS18B20 with 3 feet T0-92 package, shaped like a transistor, but also 8-pin SOIC package, as well as 6 feet TSOC package. Temperature range of -55 ~ + 125 ℃, in the range of -10 ~ 85 ℃, an accuracy of ± 0.5 ℃. Each DS18B20 chip ROM is stored in a 64-bit ID number: 8 before the product type number, followed by 48 of the device itself is serial number of the last eight in front 56 cyclic redundancy check code. Because of its parasitic power mode power supply can be used. Thus, it can also mount on a bus with multiple DS18B20, multi-point temperature measurement system.

結果 (中文) 3:

直流电源，又称直流稳压电源。它主要是一个交流电压电源电压时，输出电压或负载电阻交流电源电压，直接输出电压调节器可以保持稳定。电压调节器参数的稳定性、纹波系数和响应速度。前者表示输出电压的输入电压变化。在额定工作条件下，输出电压的大小表示在额定工作条件下，后者表示输入电压或负载变化突然，电压返回到正常的时间要求。直流电源连续导电型和分型开关类。前者由频率变换为单相或三相交流电压变为适当的值，然后再整流、滤波后得到不稳定的直流电源，然后将电压调节器电路获得稳定的电压（或电流）。该电源线简单、纹波小、相互干扰大，但体积大、耗材少，效率更高（通常不到40%到60%）。后者改变调整元件（或开关）的时间比调节输出电压达到调节。这种小功率消耗，效率高达85%，但缺点是大纹波，大的相互干扰。因此，自上世纪80年代以来的快速发展。从工作可分为：①可控整流器。通过改变晶闸管的导通时间来调节输出电压。②斩波器。输入直流电压是不稳定的，改变开关电路，而不是得到一个单向脉动直流，然后过滤，以获得稳定的直流电压。③变压器型。首先由不稳定的直流电压逆变器转换为高频交流电，然后由变压器、整流、滤波，产生新的直流输出电压采样、反馈控制的逆变器频率，以稳定输出直流电压。5.5温度传感电路5.5.1分析温度检测程序由于超声波也是声速的一部分，所以在传输路径上也会受到外部因素的影响，如温度，以获得更精确的距离传感器和表面，温度传感器检测环境温度条件的时间，并转换到相应的超声波速度，利用这个速度来计算距离，你可以得到更准确的距离。因此，在整个系统中加入一个温度传感器，以检测当时情况的温度。5.5.2介绍DS18B20数字温度传感器美国达拉斯公司推出的DS18B20单总线数字温度芯片[ 8 ]。他拥有独特的单总线接口模式，只有一个端口可以实现双向通信与单片机。数字信号输出的信号，提高噪声免疫力和温度测量精度。他的工作电压范围宽（3 ~ 5.5 V），你可以使用外接电源，也可以使用寄生电源模式，即，当总线是高，信号能量偷DS18B20供电。他还负功能，电源极性反转，DS18B20不会接错线而烧毁，但不能正常工作。它可以编程实现9至12位转换精度温度设定。设置较高的分辨率，所需的温度数据转换时间较长，在实际应用中的分辨率和转换时间的权衡。5.5.3 DS18B20的结构和电路DS18B20和3脚t0-92包，形状像一个晶体管，而且8引脚SOIC封装，以及6英尺TSOC封装。温度范围为55～125～10～85～～，准确度为±0.5。每个DS18B20芯片ROM存储在一个64位的身份证号码：8，在产品种类数量，其次是48的设备本身是在前56循环冗余校验码的最后八个序列号。因为它的寄生电源供电方式可以使用。因此，它也可以安装在总线的多传感器、多点温度测量系统。