Ask a question about the transformer charging the car 5

First of all, it is necessary to understand that the best way to charge the battery is pulsating DC, and the larger the pulsation amplitude, the better, such as half-wave rectification and bridge rectification. If you can confirm that your DC12V does not have a filter capacitor, it can be used to charge the car battery.

The power amplifier can be used with the battery direct current, not the charging power supply, because the charging voltage is a pulsating DC voltage, there is no filtering, if it is used to supply power to the power amplifier, the horn will emit a buzzing AC sound.

1. It is not recommended to use AC220 to DC12V transformer to charge the battery, generally the battery charging voltage needs to exceed 12V, if you directly use the 12V transformer to charge the 12V battery, it may not be charged or the charging is very slow, and it is not good for the battery.

2, AC220V, 100A transformer, its maximum output power is 1200W, normally the power of the car audio should be smaller than this power, so there should be no need for parallel batteries.

Agree with the statement upstairs, the charging voltage of the battery charging, the car audio can be directly powered by DC12V power supply, and at the same time it is not necessary to put on the battery, and the battery will cause unnecessary power loss, and the battery itself is not good, the car audio does not need so much power, one or two hundred W is enough!

If the car power amplifier is Class AB, the current at 20A is generally enough, and if it is Class D, it is slightly larger, and the battery is enough.

Most of the car charging circuits are buck circuits composed of 34063, and the output voltage can be changed by changing the voltage of the sampling point of the 5th pin.

The car charger belongs to the regulated circuit, and the output voltage will not change with the change of the input voltage within the nominal range, otherwise it is not called the regulated power supply.

The working voltage range of 34063 is very wide, if you ignore the voltage drop of the circuit, as long as the input voltage is higher than 5V, it can work normally, and the actual circuit can output 5V voltage stably by about 1V higher than 5V.

Selection of transformer type. Transformers can be divided into dry-type transformers and oil-immersed transformers. The type of charger (station) transformer can be selected according to the actual situation of the project.

It is recommended that the charger (station) transformer adopt SC (epoxy resin casting encapsulated) dry-type transformer. Epoxy dry-type transformer has good electrical and mechanical properties, high heat resistance level, and is a reliable and safe environmental protection, energy-saving new product, which can adapt to a variety of harsh environments.

Selection of the number of transformers. The number of transformers should be selected to meet the requirements of the load for the reliability of power supply. If centralized charging is adopted, and then a battery store is set up in the community (the operation mode is similar to that of a water station to deliver drinking water), it is necessary to choose two transformers to ensure the high reliability of the charging station.

If the charger (station) is more common like a gas station, only l transformers are needed, and the reduction in the reliability of the charging station is compensated by the number of charging stations. If a charger (station) is built in a residential area, it can be considered to use a residential distribution transformer instead of a separate transformer to reduce investment.

Selection of transformer wiring. According to Article 1 of the Code for the Design of Power Supply and Distribution Systems, in the low-voltage power grid of TN and 1RR grounding types, it is recommended to use the distribution transformer of the DYRM wiring group. The explanation of the provisions states that the dynnll wiring is beneficial for suppressing higher harmonics.

The charging station is of the TT grounding type, so the transformer is DYNLL wired.

capacity, i.e. the charging power of the battery car;

Rated voltage, rated current.

The duty cycle of the circuit is only a reference for the design of the transformer, because the duty cycle needs to be considered comprehensively in the design of the transformer to determine whether there will be overvoltage or overcurrent. If there is an overvoltage, the core will be saturated and the ratio will fail. If the current is overcurrent, the transformer may burn out.

People are talking about high-frequency transformers, magnetic cores, in fact, you can find electric vehicle chargers on the Internet, transformer data, it is estimated that you can find a lot of chargers, charger circuit diagrams, and circuits of large factories can be used for reference