What Is a Selenium Rectifier?

Rectifier (English: rectifier) is a device that converts AC power to DC power. It can be used to supply power and detect radio signals. Rectifiers can be made of vacuum tubes, pilot tubes, solid-state silicon semiconductor diodes, mercury arcs, etc. In contrast, a device that converts DC power to AC power is called an inverter.

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Rectifier (English: rectifier) converts alternating current into

A rectifier is a rectifier device, which is simply a device that converts alternating current (AC) into direct current (DC). It has two main functions:
First, change the alternating current (AC) into direct current (DC) and supply it to the load after filtering or to the inverter;
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Today, the industry s energy-saving lamps and

1. Input Current Total Harmonic Distortion (THD)

The THD of the input current of the 6-pulse rectifier should be less than 33% at the full-load input current of the 6-pulse rectifier; using an input filter can reduce the input current distortion to 10%.

The THD of the input current of the 12-pulse rectifier should be less than 10% at the full load of the 12-pulse rectifier. The input filter can reduce the total harmonic distortion of the input current to 5%.

2. AC input current limit

The rectifier / charger should have an AC input current limiting circuit, which generally limits the AC input current to 115% of the full load input current. When the generator set is powered (at this time the rectifier will receive an external low-voltage signal, which is determined to be powered by the generator set), the AC input current should be limited to 100% of the full load input current.

3 Battery charging current limit

The rectifier / charger should have a battery charge current limiting circuit that limits the battery charge current to 15% of the UPS's rated output capacity (KW). When the generator set is powered (when receiving an external low voltage signal), the battery charging current should be limited to zero.

4 Battery charge voltage temperature compensation

When a remote temperature detector is used, the rectifier / charger should automatically adjust the battery float charge voltage (generally at 5mv / pc / ). Generally, the floating charge voltage of the battery is 2.25V / only, and the termination voltage is 1.67V / only. Therefore, the DC bus voltage is N × 2.25V, N × 1.67V (N is the number of batteries) when the floating charge and termination voltage are respectively .

5. Gradual increase in input power

The rectifier / charger shall have the capability to limit the initial power requirement to 20% of the rated load and gradually increase the input power to 100% of the rated capacity within a 10-second interval. In a redundant UPS system, the input time of each rectifier / charger should be delayed by 5 to 300 seconds to reduce the impact on the generator set.

6. Input isolation switch

The rectifier / charger should have input isolation switch and be protected. The isolating switch should be able to provide both the load current and the battery recharge current, and can withstand large short-circuit currents.

7. DC filter

The rectifier / charger should have an output filter to minimize the ripple voltage applied to the battery. The AC ripple voltage of the rectifier's DC output voltage should be less than 1% of the floating charge voltage (RMS). The filter should fully ensure that the DC output voltage of the rectifier / charger meets the requirements of the inverter when the battery is not connected.

8. Recharging the battery

In addition to powering the load, the rectifier / charger should be able to restore the battery's discharge power to 95% within 10 times the discharge time. After the battery is recharged, the rectifier / charger should keep the battery in a fully charged state until the next discharge.

The simplest of all rectifier categories is the diode rectifier. In the simplest form, the diode rectifier does not provide any means to control the value of the output current and voltage. In order to be suitable for industrial processes, the output value must be controllable within a certain range. This control can be accomplished by applying a mechanical so-called on-load tap changer. As a typical case, the on-load tap changer is

Very close in design to the diode rectifier is

Difference between ballast and rectifier

A device that converts AC power to DC power is called a rectifier.

According to the rectifier used, it can be divided into mechanical, tube and semiconductor types.

The simplest voltage doubling (double) method is to use two sets of simple half-wave rectification to point the opposite

The main application of the rectifier is to convert AC power to

Rectifiers commonly use three types of cooling: natural cooling, pure fan cooling, natural cooling and fan cooling. Natural cooling has no mechanical failure and high reliability; no air flow, less dust, which is good for heat dissipation; no noise and so on. Pure fan cooling has light equipment and low cost. The combination of fans and natural cooling has the characteristics of effectively reducing the size and weight of the device, the long life of the fan, and the strong fault self-adaptation ability. ^[3]