The switch manufacturer will introduce to you the common sense of circuit today. Detailed details will be introduced below. I hope you will pay attention to us and support us for a long time.
The heat resistance test of the switch is placed at 85 +2 C for 96 hours, and then at normal room temperature for 1 hour. Requirements: No abnormal appearance, meet the mechanical and electrical performance. The cloth was placed at 40+_2 C for cold resistance test. After 96 hours in 90-96% environment, the sample is tested in normal environment for 1 hour. Its characteristics are stable performance, easy to use and low cost. It can be used for power cut-off and switching-on, and also for converting gears of recorders. Especially when a high-power regulated power supply is constructed, its volume is much smaller than that of a linear power supply under the same output power, and its cost is also significantly reduced. Taking the early 20KHZ switching power supply as an example, compared with the performance of linear power supply, it can be seen that many technical indicators of switching power supply are better than linear power supply.
At present, the switching frequency of the switch has been increased to more than 1 OOKHZ, where C is the bypass capacitor. The RST terminal phase silicon of MCP1321 and MCU. When + 5V voltage of DC power socket is lower than + 29V or higher than + 5.8v, mcp1321 will reset immediately. The I/O port of MCP 1321 continuously sends negative pulses to the WDl end of MCP 1321. The watchdog timer is reset regularly. Once the program runs away, the RST signal from the self-locking switch MCP l321 can reset the MCP. R2 t is the internal pull-up resistance at WDI end and R is the external pull-up resistance at RST end.
(1) Understand the basic components of the circuit and the role of each part, understand the rated value of electrical equipment and the working state of the circuit: familiar with the basic concepts of circuit model and lumped parameter circuit; master the difference between ideal circuit components and actual components: firmly grasp the volt-ampere characteristics of linear components: understand the concepts and characteristics of ideal voltage source and ideal current source: familiar with the power supply model and reality The correspondence of power supply is related to the equivalent interchange method between power supply models, and grasps the differences between the concepts of electric energy and electric power. Understand the thermal response of current, understand the application of thermal effect of current in practical engineering and real life.
(2) understand the contents and extended applications of Kirchhoff's current and voltage laws, and master the methods and skills of applying the two law to analyze complex circuits.
(3) grasp the importance of the voltage and current reference positive direction in circuit analysis and the connection with the actual direction of voltage and current, understand the superposition law and the steps and application occasions of Thevenin's analysis circuit, and use them to analyze and calculate the circuit.
I. Requirements for Ability Development
(l) Through teaching experiments and practical links, understand the necessity and importance of strictly abiding by electrical operation rules and regulations, understand laboratory operation rules, cultivate good working habits, and have preliminary skills of experimental operation.
(2) having the skills of using circuit box and digital multimeter.
(3) It has the measurement skills of voltage, current and resistance, and the ability to find out the cause of experimental error in the experiment.
(4) Have the ability to draw up experimental steps to verify KCL KVL law. Insulating shoes must be worn well when working, and live work is strictly prohibited under normal circumstances.
2. In the climbing operation, two or more persons must be brought with safety helmet, safety measures should be taken on the site of power consumption, good grounding of all electrical equipment should be made, problems should be found and repaired in time, and live operation shall not be allowed.
3. The power supply should be cut off during inspection, and the "No Closing" sign should be hung up.
4. Power transmission during overhaul must be carefully checked to ensure that there are no problems before power transmission can be achieved.
5. In order to discover abnormal situations, we must first find out the causes and strictly prohibit power transmission without finding out the causes, so as to avoid serious consequences.
6. All kinds of machinery and equipment are strictly prohibited from overloading operation and have the right to stop power supply in violation of safety operation rules.
Seventh, on-site transmission machinery must achieve one machine and one gate, and it is strictly prohibited to use one gate for multiple purposes.
8. Be responsible for regular testing of derrick limit, lightning rod device and leakage switch. If failure is found, it must be replaced in time.
9. Effective first aid measures should be taken immediately in case of personal electric shock.
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