Based on discussion on several common elevator door lock circuits with software, this paper points out some hidden peril of the accident in such circuits, and designs a circuit using PLC.
常见的电梯门锁安全电路中，门锁继电器在多种情况下都可能产生误动作，存在事故隐患。
This paper gives a detailed analysis of the principle of the phase lock circuit, one of the most important parts of the QF1052B Standard Signal Generator and provides some methods of checking it.
本文详细分析了QF1052B型标准信号发生器锁相环部分的基本组成及其工作原理，并提出了对此部分电路的检测方法。
The digital realization of monostable circuit and extraction of bit-synchronous signal with digital phase lock loop are also introduced in detail.
对于其中的单稳态电路的数字化和数字锁相环提取位同步信号也进行了详细的设计说明。
In the new scheme proposed, the phase lock loop is avoided and the digital logical circuit is used.
该方案利用信号自身的特性，采用数字逻辑设计，有效避免了性能不高的锁相环的使用。
The circuits used are Chua 'circuit and phase lock loop.
所用的电路为蔡氏电路和锁相环电路。
Smart circuit design provides internal data protection. When the data are burnt within the hardware lock, the operator will break.
智能型线路设计，提供有内部数据安全保护措施，当硬件锁内部数据烧录动作完成后，工作人员会将。
This paper mainly discusses the design and the application of the IGBT phase lock control circuit controlled by the induction heating power supply.
本文主要介绍IGBT锁相控制电路在感应加热电源控制系统中的设计和应用。
Guaranteed condition: If any invalid card is read, the circuit in the lock can still function properly with no damage.
保证条件：接触任何非法卡，锁内电路不会损坏，仍能正常使用。
This system is also equipped with "PILOTONE" and the latest "NOISE LOCK" dual-squelch circuit that will eliminate the random noise interference when the receiver is at its standby state.
本系统装备有“PILOTONE”和最新的“噪音锁”双重消杂音电路，当接收器在它的待命状态时，它可消除随机的噪音干扰。
Owing to the peculiarities of the PLC Ladder Logic graphic, there may well be the possibilities of the invalidation in the electric chain lock on the circuit.
由于该系列PL C解算梯形图流程的特殊性，容易引起控制电路中电气联锁环节的失效。
It can control the stepper motor to change the pressure of the relay, and the A/D circuit samples the signal of the pressure sensor and then acquires the lock or alarm value after processing.
该校验仪通过步进电机对密度继电器压力进行调节，并通过模数转换电路采集压力传感器的输出，实现对密度继电器报警及闭锁压力的测量。
In this paper we discuss how it works about touch switch, to analyse and compare some typical touch switch circuits, to give a detector circuit on two-point 'touch-electronic lock.
本文讨论了触摸开关的工作原理，分析比较了几种典型的触摸开关单元电路，给出双点触摸式电子锁探头设计的一个方案。
This paper introduces an auto-alarming electronic cipher lock system designed with the AT89C2051 monolithic integrated circuit.
介绍了一种应用AT89C2051单片机设计的防盗自动报警电子密码锁系统。
The phase-lock technique is widely used in many fields, such as modulation and demodulation circuit and frequency synthesizer circuit.
锁相技术在调制和解调、频率合成电路等很多领域应用极其广泛。
The phase lock loop is a feedback control system that makes two telecommunication signals' phase synchronization, suitable to the synchronous trigger circuit of the convertor device.
锁相环路是完成两个电信号相位同步的反馈控制系统，适宜于变流装置的同步触发电路之中。
This paper discusses the influence of mixer on the phase lock-loop (PLL) circuit of a local oscillator. In mixer, local signal is produced by the PLL circuit.
本文讨论了采用锁相环路作为本振信号的混频器对本振锁相环路的影响。
We design an advanced secret code lock based on PIC16C57 chip micro computer, and present the hardware circuit diagram and some software flow charts.
利用单片机PIC1 6c5 7设计了一种高级密码锁电路，给出了硬件电路图及部分软件流程图。
For the signals are very weak, the lock-in amplifier is employed to extract the signals in the circuit design. It can inhabit the noise in the most and maximize the signal-to-noise.
在电路设计上采用锁相放大器来提取微弱信号，最大限度的抑制噪声，提高系统的信噪比。
The electronic cipher lock is a electronic products, which control the mechanical switch by the control circuit or chip when you input a password.
电子密码锁是一种通过密码输入来控制电路或是芯片工作，从而控制机械开关的闭合，完成开锁、闭锁任务的电子产品。
The household garage password lock switch designed this time is made of the launch controller circuit, the receiving circuit, and driving circuit;
本次设计的家用车库开关密码锁控制器由发射电路，接收电路，和驱动电路组成；
Therefore, the frequency synthesizer works in millimeter wave band is mostly designed and realized by the way of indirect phase lock frequency synthesis, based on specific integrated circuit.
广泛采用的直接数字式频率合成方法，却面临输出频率上限难以提高和输出杂散的难以抑制两个难题。
The principle of phase lock loop and its application in the motor power-measuring system are introduced, furthermore the design and analysis of the circuit for constant speed control are provided.
介绍了摊铺机行驶控制系统的基本要求，以单边行驶回路为例探讨了其工作原理； 根据摊铺机对行驶速度的要求，分析了恒速控制技术，探讨了行驶系统控制方式。
The principle of phase lock loop and its application in the motor power-measuring system are introduced, furthermore the design and analysis of the circuit for constant speed control are provided.
介绍了摊铺机行驶控制系统的基本要求，以单边行驶回路为例探讨了其工作原理； 根据摊铺机对行驶速度的要求，分析了恒速控制技术，探讨了行驶系统控制方式。
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