Thermal accounting requires information such as power loss, thermal resistance of the package, and ambient temperature. The power loss is calculated in the same way as the efficiency accounting, which is simply the value of the difference between the output input voltage and the input current. The thermal resistance should have a technical standard documented, and if it is not, it is necessary to ask the manufacturer. Basically, the thermal resistance and θja between the chip (junction) and the surrounding area (Ambient) are used. Although some ICs can provide the thermal resistance θjc to the outer shell, it is still necessary to find the thermal resistance to θja stopping. Finally, the ambient temperature, which can be calculated according to the rated value of the whole machine, such as 50°C. If the requirements are high, it is necessary to conduct actual measurements.
The idea is as follows: You can find the heat of the IC chip based on the power loss and thermal resistance, then add the surrounding temperature to find the temperature of the chip, and check whether the calculated Tj (chip temperature) does not have Tjmax (the maximum rating of the chip temperature). If Tjmax is exceeded, either condition must be changed. As explained in the preceding paragraph, not all of them can be used as standard, and they are limited depending on the output input voltage, output current, and ambient temperature.
Generally speaking, there should not be many cases that can change the input voltage or output voltage beyond the rating. It may be possible to reduce the load current (output current) as a way to deal with this. In this case, it is necessary to select the device that receives the power supply with low current consumption as much as possible. Another possible way is to lower the ambient temperature. For example, we can change from natural convection air cooling to fan cooling, improve cooling capacity if we already have fans, and re-evaluate convection. In addition, although there are ways to reduce thermal resistance and reduce power generation by installing heat sinks in linear voltage regulators, the cost and size of heat sinks must be a big discussion. In addition, from the viewpoint of improving power supply efficiency and reducing heat generation, we can consider using a switching regulator described in the next item.
|
More on that
|
Delixi circuit breaker operation failure
Operation failure is manifested by the dragging or misoperation of the circuit breaker. Because the most basic and important function of the high-voltage circuit breaker is to operate correctly and remove the fault of the power grid quickly. If the circuit breaker drags or malfunctions, it will pose a serious threat to the power grid, first of all: (1)) expand the scale of the incident, which may make the original ...
|
|
The cascade protection of Delixi circuit breaker
In the design of Delixi power distribution system, the selective cooperation between the upper and lower levels of the circuit breaker must have "selectivity, rapidity and sensitivity".
Selectivity is related to the cooperation of the upper and lower circuit breakers, and the speed and sensitivity are related to the maintenance of the characteristics of the appliance itself and the way the line operates ...
|
|
Ways to reduce the number of inverter repairs - Delixi
Inverter is a very ubiquitous equipment in modern workshops, this is a new type of equipment, the price is very noble, and the price of inverter repair is also very expensive, so in the process of using inverter, pay attention to the use of inverter, on the one hand, inverter, delay inverter ...
|
|
Delixi voltage regulator capacity and size calculation method
1. Single-phase circuit single-phase power supply - power supply with a single AC electromotive force. The fundamental power supply method for civil electricity. Single-phase load – A load that is powered by a single-phase power supply. Household appliances such as lights, televisions, and electric fans are generally single-phase loads. The accounting method is as follows:
a. When negative ...
|
|
The choice of circuit breaker for motor protection - Delixi
Class I refers to the circuit breaker, which is only used for maintenance and not for normal operation; The other is that circuit breakers are required together for maintenance and infrequent operation. In the latter case, the operating conditions and electrical life should be taken into account. The selection principles for circuit breakers for motor maintenance are as follows:
...
|
|
Delixi frequency converter E series precautions
1. Before the inverter device is in place and debugged, please tighten the components, especially the connecting bolts of the wire part, if not tightened, the connection will be heated and cause fire.
2. The on-site planning of the installation should be reasonable, and the excellent ventilation environment should be maintained.
3. The incoming and outgoing power lines of the inverter are not ...
|
|
Delixi low-voltage AC contactor can not be suction reason
AC contactor can sometimes be used for a long time can not be suction situation, although this is not a common problem of AC contactor, but AC contactor can not be suction will affect the efficiency of the operation and even damage the production equipment, with the equipment for too long, together without outstanding maintenance, are ...
|
|
Delixi inverter common problems
1. The pressure of Delixi inverter system is unstable and simple vibration?
Answer: The pressure of the system is unstable, which may be due to the following reasons:
A. There is a problem with the orientation of the pressure of the pressure sensor collection system, the pressure collection point is too close to the water pump outlet, and the pipeline pressure is affected by the water outlet ...
|
|
Delixi launched a series of new products of "product intelligence".
Delixi Electric launched a new "product intelligence" series of products, with outstanding quality and higher cost performance of professional competitiveness, to meet the green consumption demand for low-voltage electrical appliances in the field of construction and real estate, and promote China's low-voltage electrical profession into a new green development era. This "product wisdom" ...
|
|
The meaning of type B, type C, type D in circuit breaker - Delixi
In the circuit breaker model, the requirement clearly indicates the type of tripper trip characteristic curve, which is a very important parameter in the circuit breaker model expression. The type of trip is generally indicated before the circuit breaker has additional housing current.
For example...
|
|
Problems in the installation and use of Delixi voltage regulator
What is the voltage regulator can not be connected in parallel, the voltage regulator is not open for a long time, what will be the problem with the voltage regulator still open under normal voltage, is it said that the voltage regulator and the undervoltage lamp is not lit to clarify that the voltage regulator is normal?
Will a normally open regulator burn it out at normal voltage?
...
|
|
Delixi spare parts replacement cycle
1. Cooling fan (2-3 years)
As long as the inverter is in use, the cooling fan has always been running, so the cooling fan is generally a short-service life accessory, generally after the use of the cooling fan for 2-3 years, the bearings, balls, motors, etc. of the fan are seriously worn, and they need to be replaced.
|
|
Precautions for the use of Delixi leakage protector
1. If the two branch lines are connected, the current in the zero line flows to each other, which destroys the working current balance in the zero sequence current transformer and causes the leakage protector to malfunction. If you want to use the neutral line of the power branch line as the neutral line of the lighting branch line nearby, it will cause the leakage of the power branch line.
|
|
Delixi uses three-phase regulators need precautions
1. If the fuse is burned out, please approve the load equipment as soon as possible, make repairs in time, and restore power;
2. If you use a fixed amount of fuse, please use a regular line, and do not match it at will, so as not to cause ...
|
|
Debugging method of servo motor - Delixi
First: Initialize the parameters
Before wiring, initialize the parameters. On the control card: select the control method; Reset the PID parameter to zero; When the control card is powered on, the enabling signal is turned off by default; Save this status to ensure that this is the condition when the control card is powered on again.
The servo motor ...
|
|
After 12 years of political participation, Hu Chengzhong said frankly that he is most concerned about the livelihood of private enterprises
Since 2003, when he was first elected to the National People's Congress Committee, Hu Chengzhong, the current chairman of the executive president of Delixi Group, was re-elected as the National People's Congress Committee for two consecutive terms, and in 2018, he was once again elected as a representative of the people from all over the country.
|
|
Parameters of Delixi inverter speed controller
(1) Gain Parameter: The share gain of the speed manipulator. If the gain is too large, it may cause speed fluctuations.
(2) Integration time parameter: the integration time of the speed manipulator, that is, the change rate of the output signal of the manipulator under the deviation step signal. The shorter the integration moment ...
|
|
Delixi surge protector knowledge quiz
Many people don't know what a surge is, surge is also known as a surge or lightning protection maintainer, the first is to maintain the household electrical equipment when it rains and thunders to avoid being damaged by lightning, and when the lightning strikes high-voltage electricity is drained to the ground through the surge maintainer, it will not directly hit the electrical equipment ...
|
|
Delixi selects the rated parameters of the contactor
According to the controlled target and operating parameters such as voltage, current, power, frequency and operating system, the additional parameters of the contactor are determined.
1) The coil voltage of the contactor should generally be lower, so that the insulation requirements of the contactor can be reduced, and it is safer to use. But for the sake of the party ...
|
|
CDQ1F series PC-level excitation automatic transfer switch - Delixi
Delixi Electric's newly launched CDQ1F series PC-level excitation active transfer switch, with more complete specifications and stronger functions, the power-off time can be shortened to less than 0.1s, escorting the continuous use of electricity in important places!
CDQ1F Active ...
|
|
Contact
working hours
