Solar light tower
Solar
light tower is efficient and delivers high performance light tower, giving
workers good visibility while allowing sites to increase sustainability with
zero COâ‚‚ emissions and zero noise, zero operating
costs (diesel fuel, maintenance, labor), it is 100% renewable energy, stronger
structure can load more power solar panels and batteries, patented rotating
mechanism can adjust angle of solar panel to best align with the sun's location
to achieve maximum solar yield.
A solar light tower is a portable lighting system that is powered by solar energy. It consists of a tall tower structure with multiple LED lights mounted on top. The tower is equipped with solar panels that capture sunlight and convert it into electricity, which is stored in batteries for later use.
In addition, there are more types of light tower for you to choose from: LED Light Tower, Traditional Light Tower, and Hydraulic Light Tower, Solar Light Tower, etc
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Solar light towers are commonly used in various applications where temporary lighting is needed, such as construction sites, events, emergency response situations, and remote areas without access to electricity. They provide bright and reliable illumination without the need for fuel or grid power, making them environmentally friendly and cost-effective.
These light towers are typically designed to be easily transportable and can be set up quickly. They are also equipped with features like automatic dusk-to-dawn sensors, motion sensors, and remote control operation for convenience and energy efficiency. Overall, solar light towers offer a sustainable and efficient lighting solution for various outdoor applications.
Watchdog circuit design based on complex programmable logic device technology
With the rapid advancement of modern electronic technology, microprocessor-based electronic devices have become widely integrated into various sectors of national production. As these devices grow more powerful and their software architectures become increasingly complex, the length of instruction codes expands, and the likelihood of system malfunctions—such as program "runaway" or module "deadlocks"—increases significantly due to environmental interference. To address this challenge, a common solution is to implement a hardware watchdog circuit. This circuit forces the system to reset and return to its initialization routine whenever it becomes unresponsive.
As Complex Programmable Logic Devices (CPLDs) are now extensively used in the design of various instruments and systems, they offer a flexible alternative to traditional dedicated watchdog circuits. Since CPLDs can emulate almost any logic function, integrating a watchdog circuit directly into the CPLD not only reduces costs but also minimizes design risks. The following sections describe the design of a watchdog circuit using CPLD technology.
**2 Working Principle**
CPLD stands for Complex Programmable Logic Device, known for its high efficiency, minimal internal delay, and predictable timing. These features make it ideal for implementing counters, control circuits, and state machines. The core component of a watchdog circuit is a timing counter. By leveraging the capabilities of CPLD, the watchdog function can be effectively realized.
The watchdog circuit consists of three main components: a frequency divider, a timing counter, and a reset circuit. A 32768Hz square wave clock is first fed into the frequency divider, which reduces the frequency to 1024Hz. This divided signal is then passed to the timing counter, where it is compared against a preset value. If the CPU fails to reset the CS terminal within the specified time, the counter reaches the set value, triggering a high-level signal that activates the reset circuit. For example, with an MCS51 microcontroller, a reset pulse longer than 10ms ensures a reliable system reset.
**3 Circuit Design**
Xilinx's CPLD devices are widely adopted due to their robust design platform, secure encryption, and comprehensive product lineup. Taking the X95 series as an example, we will explore the implementation of a watchdog circuit.
**3.1 Frequency Dividing Circuit**
This circuit is implemented using the COUNT5 macrocell in Figure 1. It uses a 5-bit binary counter to divide the 32768Hz input signal by 32, resulting in a 1024Hz square wave with a period of approximately 1ms. The simulation waveform demonstrates the operation of this stage.
**3.2 Counting Timing Circuit**
This is the core of the watchdog circuit, implemented using the COMP macrocell. It includes an 8-bit counter, an 8-bit register, and an 8-bit comparator. Initially, the register is set to 0FFH. When the 1024Hz signal is counted, the comparator checks if the count matches the register value. Upon matching, a high-level reset signal is generated, disabling further counting and activating the reset circuit. The simulation shows how this process works.
**3.3 Reset Delay Circuit**
This circuit, implemented using the DELAY12MS macrocell, ensures that the reset signal remains high for at least 10ms, guaranteeing a stable system reset. After the delay, the reset signal clears all counters, ending the reset cycle. The simulation illustrates the timing behavior of this stage.
**4 Conclusion**
This design has been successfully implemented in several products. Integrating the watchdog function into a CPLD device not only improves system reliability but also eliminates the need for separate watchdog components, reducing both cost and design complexity.