Electronic Ballast: Scheme 2х36

Electronic ballast is a device that includes fluorescent lamps. The models differ in terms of nominal voltage, resistance and overload. Modern devices are capable of operating in an economical mode. The ballasts are connected via controllers. As a rule, they are of the electrode type. Also, the connection diagram of the model assumes the use of an adapter.

Standard Device Diagram

Schemes of electronic ballasts of fluorescent lamps include a set of transceivers. Contacts for models are of a commutated type. A typical device consists of capacitors with a capacity of up to 25 pF. The regulators in the devices can be of the operating or conductor type. Stabilizers in ballasts are installed through the plate. To maintain the operating frequency, the device has a tetrode. The choke in this case is fixed through the rectifier.

Low efficiency devices

Electronic ballast (2х36 circuit) of low efficiency is suitable for 20W lamps. The standard scheme includes a set of expansion transceivers. The threshold voltage at them is 200 V. Thyristor in devices of this type is used on the plate. The comparator is struggling with overloads. Many models use a converter that operates at a frequency of 35 Hz. To increase the voltage, a tetrode is used. In addition, adapters for connecting ballasts are used.

High efficiency devices

Electronic ballast (connection diagram is shown below) has one transistor with an output to the plate. The threshold voltage of the element is 230 V. For the overloads, a comparator is used which operates at low frequencies. These devices are well suited for lamps up to 25 W. Stabilizers are often used with variable transistors.

In many circuits, converters are used, and their operating frequency is 40 Hz. However, it can increase with increasing overload. It is also worth noting that ballasts use dinistors for rectifying the voltage. Regulators are often installed behind transceivers. Operational taxes give a frequency of not more than 30 Hz.

15 W device

The electronic ballast (2 x 36 circuit) for 15 W lamps is assembled with integrated transceivers. Thyristors in this case are fixed through a throttle. Also worth noting that there are modifications on the open adapters. They are distinguished by high conductivity, but they operate at a low frequency. Condensers are used only with comparators. The nominal voltage during operation reaches 200 V. Insulators are used only at the beginning of the circuit. Stabilizers are used with a variable regulator. The conductivity of the element is not less than 5 microns.

20 W model

The electronic circuit of the electronic ballast for lamps of 20 W implies the use of an expansion transceiver. Transistors are commonly used in different capacities. At the beginning of the circuit, they are set to 3 pF. In many models, the conductivity index reaches 70 microns. At the same time, the sensitivity coefficient is not greatly reduced. Condensers in the circuit are used with an open regulator. The operating frequency is lowered through the comparator. In this case, the rectification of the current is due to the operation of the converter.

If we consider circuits on phase transceivers, then there are four capacitors. The capacity at them starts from 40 pF. The operating frequency of the ballast is maintained at 50 Hz. Triodes for this purpose are used on operating regulators. To reduce the sensitivity factor, you can find different filters. Rectifiers are often used on the lining and are installed behind the throttle. The conductivity of the ballast depends primarily on the threshold voltage. The controller type is also taken into account.

Ballast circuit for 36 W

The electronic ballast (2 x 36 circuit) for 36W lamps has an expansion transceiver. The device is connected via an adapter. If to speak about indicators of ballasts, the nominal voltage is equal to 200 W. Insulators for devices are suitable for low conductivity.

Also, the 36W electronic ballast circuit includes capacitors with a capacity of 4 pF. Thyristors are often installed behind filters. To control the operating frequency, there are regulators. Many models use two rectifiers. The operating frequency for ballasts of this type is a maximum of 55 Hz. In this case, the overload can greatly increase.

Ballast T8

Electronic ballast T8 (the circuit is shown below) has two transistors with low conductivity. The models use only contact thyristors. Condensers at the beginning of the circuit are of large capacity. It is also worth noting that ballasts are produced on contactor stabilizers. Many models support high voltage. The coefficient of thermal losses is about 65%. The comparator is set at a frequency of 30 Hz and a conductivity of 4 μ. The triode for it is selected with a cover and an insulator. The device is switched on via an adapter.

Using transistors MJE13003A

The electronic ballast (2х36 circuit) with MJE13003A transistors includes only one converter, which is behind the throttle. Models use a contactor of a variable type. The operating frequency of the ballasts is 40 Hz. In this case, the threshold voltage at overloads is 230 V. The triode in devices is of the pole type. Many models have three rectifiers with a conductivity of 5 microns. Disadvantage of the device with MJE13003A transit can be considered high thermal losses.

Using transistors N13003A

Ballasts with these transistors are valued for good conductivity. They have a small coefficient of heat loss. The standard circuit of the device includes a wired converter. The throttle in this case is used with an overlay. Many models have low conductivity, but the operating frequency is 30 Hz. Comparators for modifications are selected on a wave condenser. Regulators are suitable only for operating type. In total, the device has two relays, and contactors are installed behind the throttle.

The use of transistors KT8170A1

The ballast on the transistor KT8170A1 consists of two transceivers. The models have three filters for impulse noise. The rectifier is responsible for turning on the transceiver, which operates at a frequency of 45 Hz. Models use only variable type transducers. They operate at a threshold voltage of 200 V. These devices are great for 15W lamps. The triodes in the controllers are of the output type. The overload indicator can vary, and this is primarily due to the capacity of the relay. Also remember the capacitance of the capacitors. If we consider wire models, then the above parameter for the elements should not exceed 70 pF.

The use of transistors KT872A

Schematic diagram of electronic ballast on transistors KT872A assumes the use of only variable transducers. The bandwidth is about 5 microns, but the operating frequency can vary. The transceiver for ballast is selected with an expander. Many models use several capacitors of different capacities. At the beginning of the chain, the elements with the plates are applied. It is also worth noting that the triode can be installed in front of the throttle. Conductivity in this case will be 6 microns, and the operating frequency will not be above 20 Hz. At a voltage of 200 V, the ballast will have an overload of about 2 A. To solve problems with reduced sensitivity, stabilizers on the expanders are used.

Application of single-pole dinistors

Electronic ballast (2х36 circuit) with single-pole diodistors is able to work with an overload of over 4 A. The disadvantage of such devices is a high coefficient of heat losses. The modification scheme includes two low-conductivity transceivers. The models have an operating frequency of about 40 Hz. Conductors are attached to the throttle, and the relay is installed only with a filter. It is also worth noting that ballasts have a conductor transistor.

The capacitor is used in low and high capacity. At the beginning of the chain, 4 pF elements are applied. The resistance in this area is about 50 ohms. Also it is necessary to pay attention to the fact that insulators are used only with filters. The threshold voltage for ballasts at power-up is approximately 230 V. Thus, the models can be used for lamps of different power.

Scheme with bipolar DC

Bipolar dinistors primarily provide high conductivity in the elements. Electronic ballast (2x36 circuit) is made with components on the switches. In this case, the regulators are of the operating type. The standard circuit of the device includes not only a thyristor, but also a set of capacitors. The transceiver is of a capacitive type and has a high conductivity. The operating frequency of the element is 55 Hz.

The main problem of the devices is low sensitivity at high overloads. It is also worth noting that triodes are only able to operate at an increased frequency. Thus, the lamps often flash, and this is caused by overheating of the capacitors. To solve this problem, filters are installed on the ballasts. However, they are not always able to cope with overloads. In this case, it is necessary to take into account the amplitude of jumps in the network.