RU2700291C1 - Secondary pulse power supply of fiber-optic gyroscope - Google Patents

Abstract

FIELD: physics; instrumentation.

SUBSTANCE: invention relates to the field of gyroscopic instrument-making and is intended to provide power to fiber-optic gyroscopes (FOG), which are part of gimballess inertial navigation systems (GINS) of aircrafts. FOG secondary pulse power supply relates to "DC-DC" class of converters. Secondary pulse power supply of fiber-optic gyroscope comprises input filter, pulse voltage stabilizer, first and second converters, first and second power pulse transformers, pulse transformer, start-up circuit, first, second, third, fourth, fifth and sixth rectifiers, first, second, third, fourth, fifth and sixth output filters, first, second, third, fourth, fifth and sixth linear stabilizers.

EFFECT: technical result is higher reliability and interference immunity of circuit.

1 cl, 6 dwg

Description

The invention relates to the field of gyroscopic instrumentation and is intended to provide power to fiber optic gyroscopes (FOG), which are part of the strapdown inertial navigation systems of aircraft (LA). The secondary VOG switching power supply belongs to the class of “DC-DC” converters or the secondary power supply.

VOG consists of two functional units - an optical unit and a processing unit. The optical unit is designed to convert one physical quantity - the angular velocity of rotation, into another - an electrical signal. The processing unit generates a phase modulating signal for controlling the optical unit, detects the useful component of the output signal of the optical unit, converts its amplitude to a digital code and performs code correction to improve the accuracy of measuring angular velocity.

A VOG power supply device based on the PN9S voltage converter is known (PN9S voltage converter. Schematic diagram. PIKV.436731.020E3. PNPPK, Perm, 2016). This device provides power to the optical unit and the FOG processing unit. The voltage converter is made on the basis of unified power modules (on microcircuits) for the processing unit and a linear integral stabilizer for the optical unit. To decouple from each other the power sources of the optical unit and the processing unit along the start-up circuit in order to increase the noise immunity of the circuit, an optocoupler is used, which is triggered after the OFF_PWR signal is removed from the optical unit.

The disadvantage of this device is the presence of a direct connection between the input and output buses, which, in general, reduces the noise immunity of the device.

The closest analogue is a secondary switching power supply (International Rectifier ARM28XXT series hybrid - high reliability 1 mega-rad hardened DC / DC converter, www.irf.com) containing an input filter, a high-frequency converter with voltage stabilization function, a voltage feedback node with galvanic isolation, power transformer, three channel rectifiers, three output filters.

This device is implemented in unified power modules of domestic (for example, MDM series “Alexander Electric”) and foreign production (“International Rectifier” series ARM28XXT). However, the known device has inherent disadvantages due to the fact that it uses the method of group voltage stabilization (feedback signal is removed only from the output of the main channel). The main disadvantage of this structure is the low voltage stability of the additional channels. Depending on the load current of the main channel, the output voltage of the remaining channels can vary significantly due to changes in the voltage drop across the rectifier diodes and transformer windings. In addition, unified converters operate at different generation frequencies, which increases the level of output voltage ripples and reduces the noise immunity of the circuit.

For the operation of the FOG processing unit, five voltage sources are required that are not connected via common buses to the power supply of the optical unit.

The optical unit provides an electrical signal to turn on the power of the processing unit only after the laser module has been warmed up (in the optical unit) to the required temperature. Since the magnitude of the pulses of the input current of the amplifier does not exceed a few nanoamperes, of a duration of about two tens of nanoseconds and a frequency of at least hundreds of megahertz, it is necessary to ensure high noise immunity of the electrical circuit of the optical unit and to galvanically separate the power supply of the optical unit and the processing unit.

The technical problem lies in the creation of a reliable and noise-resistant secondary pulse-type FOG power supply under the influence of external factors of ionizing radiation on the aircraft.

The technical results to which the invention is directed are to increase the reliability and noise immunity, with galvanically separated power supply of the optical unit and the processing unit.

These technical results are achieved in that in the secondary VOG switching power supply containing an input filter, the input of which is the first input of the secondary VOG switching power supply, the first power pulse transformer, the first rectifier and the first output filter, the second rectifier and the output filter connected in series connected in series with the third rectifier and output filter, it is new that a second impulse power transform is additionally introduced torus, pulse transformer, first and second voltage converters, starting circuit, fourth, fifth and sixth rectifiers and output filters, first, second, third, fourth fifth and sixth linear stabilizers, a pulse voltage regulator, the input of which is connected to the output of the input filter, and the output is connected through the first voltage converter to the input of the first power pulse transformer and to the first input of the second voltage converter, the output of which is connected to the input of the second power pulse trans a formator, the first, second, third, fourth and fifth outputs of which are connected respectively to the inputs of the second, third, fourth, fifth and sixth rectifiers, the outputs of the fourth, fifth and sixth rectifiers are connected respectively to the inputs of the fourth, fifth and sixth output filters, the outputs of the first, the second, third, fourth, fifth and sixth output filters are connected respectively to the inputs of the first, second, third, fourth, fifth and sixth linear stabilizers, the outputs of which are respectively the first m, the second, third, fourth, fifth and sixth outputs of the secondary VOG pulse power supply, while the output of the first linear stabilizer is connected to the first input of the start-up circuit, the second input of which is connected to the second output of the first power pulse transformer, and the third input is the second input VOG secondary switching power supply, the output of the starting circuit is connected via a pulse transformer to the second input of the second voltage converter.

To ensure galvanic isolation of the output channels from the primary power source, the secondary VOG switching power supply includes a high-frequency link for converting direct voltage to alternating current: the first and second power pulse transformers. The inverse transformation (rectification and voltage filtering) is carried out at the transformer output.

The first output of the secondary VOG switching power supply is designed to power the optical unit. The remaining outputs of the secondary switching power supply VOG are designed to power the processing unit.

In order to provide power to the processing unit, an additional voltage stabilizer, a second power pulse transformer, a pulse transformer (low-power, decoupling), first and second voltage converters, a starting circuit, fourth, fifth and sixth rectifiers and output filters, first, second, third, the fourth, fifth and sixth linear stabilizers, from the outputs of which five supply voltages are formed for the processing unit. The power supply to the processing unit is switched on by a start-up circuit, to which the supply voltage comes from the output of the first linear stabilizer, rectangular pulses from the first power transformer and the power-on signal (On) from the optical unit.

Improving the reliability of the secondary VOG switching power supply is achieved by using pulsed transformer junctions between the input and output circuits of the optical unit and the processing unit via common buses and a start signal, thereby reducing the amplitude of high-frequency noise voltages in the microcircuit power supply circuits, and thereby increasing the noise immunity of VOG operation.

The power supply of the optical unit and the processing unit are decoupled, moreover, are supplied sequentially one after another. When the input voltage of 27 V is applied, the voltage for the optical unit is first generated, and then, when an external control signal is received (after heating the laser module in the optical unit), the secondary supply voltage is supplied to the processing unit.

Improving the quality of stabilization of the output voltages is achieved through the use of several circuits sequentially connected one after another. An input filter is installed at the input of the VOG power supply, then a step-down switching voltage regulator is included in series, which reduces the ripple of the input voltage and increases the current in the load. Then, to ensure galvanic isolation of the input from the output, the first voltage converter is used, loaded on the first power pulse transformer, from the output winding of which the pulse voltage is converted by rectifiers, the output filter into a constant voltage. The final voltage stabilization is performed by the output linear stabilizers. To isolate the power supply of the optical unit and the processing unit along the switching circuit, a third low-power pulse transformer controlled by a start-up circuit was used. All this together increases the reliability of the device.

In FIG. 1 is a structural diagram of a secondary switching power supply of VOG. In FIG. 2 shows an embodiment of an input filter circuit and a pulse voltage stabilizer; FIG. 3 shows an embodiment of a circuit of the first voltage converter and a power pulse transformer; FIG. 4 shows an embodiment of a circuit of a second voltage converter and a power pulse transformer; FIG. 5 shows an embodiment of a circuit of a third low-power pulse transformer and a starting circuit, FIG. 6 shows an embodiment of the circuit of each rectifier, each output filter and each linear stabilizer.

The secondary switching power supply VOG (Fig. 1) contains an input filter 1, a pulse voltage regulator 2, the first 3 and second 4 voltage converters, the first 5 and second 6 power, pulse transformers, pulse transformer 7, start-up circuit 8, first 9, second 10, third 11, fourth 12, fifth 13 and sixth 14 rectifiers, first 15, second 16, third 17, fourth 18, fifth 19 and sixth 20 output filters, first 21, second 22, third 23, fourth 24, fifth 25 and sixth 26 linear stabilizers.

The input (Pit) of the input filter 1 is the first input of the secondary VOG switching power supply, and the output is connected to the input of the pulse voltage stabilizer 2, the output of which is connected to the input of the first voltage converter 3 and to the first input of the second voltage converter 4. The output of the first voltage converter 3 is connected to the first connected pulse power transformer 5, the first rectifier 9, the first output filter 15 and the first linear stabilizer 21, the output of which is connected to the first input (U1) of the triggering circuit 8. The second input (F1) of the start-up circuit 8 is connected to the second output of the first power pulse transformer 5. The third input (On) of the start-up circuit 8 is the second input of the secondary VOG switching power supply, and the output of the start-up circuit 8 is connected via the pulse transformer 7 to the second input of the second converter 4 voltage, the output of which is connected to the input of the second power pulse transformer 6. The first, second, third, fourth and fifth outputs of the second power pulse transformer 6 are connected respectively to the inputs of the second about 10, third 11, fourth 12, fifth 13 and sixth 14 rectifiers. The outputs of the second 10, third 11, fourth 12, fifth 13 and sixth 14 rectifiers are connected respectively to the inputs of the second 16, third 17, fourth 18, fifth 19 and sixth 20 output filters, the outputs of which are connected respectively to the inputs of the second 22, third 23, fourth 24, fifth 25 and sixth 26 linear stabilizers. The outputs of the first 21, second 22, third 23, fourth 24, fifth 25 and sixth 26 linear stabilizers are respectively the first, second, third, fourth, fifth and sixth outputs of the secondary switching power supply VOG.

The input filter 1 (Fig. 2) can be performed on capacitors C1-C11, transformer T1 and inductor L1. The input filter 1 is designed to reduce the amplitude of the ripple of the input voltage of the VOG.

Switching voltage stabilizer 2 (Fig. 2) may include resistors R1-R19, transistors VT1, VT2, diodes VD1 - VD4, transistor assemblies D1 - D3, capacitors C12 - C17, chokes L2, L3, Zener diode VD5. Switching voltage stabilizer 2 reduces the input voltage to 12 V and increases the allowable load current.

The first voltage converter 3 (Fig. 3) can be performed on the L4 inductor, DA1 chip, resistors R14, R20 - R22, R29 - R31, R37 - R40, capacitors C18, C20, C22, C24, C26, C28, C30 - C35 transistors VT2, VT3. The first converter 3 converts the DC voltage to the pulse to provide galvanic isolation of the power supply of the optical unit and the processing unit.

The first power pulse transformer 5 (Fig. 3) is made on transformer T2 from a ferrite ring M2500NM7-58 K16 × 10 × 4.5 mm in size. The primary windings of T2 contain 80 turns of wires, each with a diameter of 0.35 mm, and secondary - 30 turns, each with a diameter of 0.35 mm.

The second voltage converter 4 and the pulse power transformer 6 (Fig. 4) can be performed on the inductor L5, resistors R15, R32, R33, capacitors C19, C21, C23, C25, C27, C29, transistors VT4, VT5 and transformer T4 made of ferrite rings М2500НМ7-58 К28 × 16 × 9 mm. The primary windings of T4 contain 80 turns of wires, each with a diameter of 0.35 mm, and all secondary windings of 60 turns, each with a diameter of 0.25 mm. The second Converter 4 converts the DC voltage to pulse to provide galvanic isolation of the power supply of the optical unit and the processing unit.

Startup circuit 8 and low-power pulse transformer 7 (Fig. 5). can be performed on: transistor assemblies D4, D5, diodes VD6 - VD9, resistors R23 - R28, R34 - R36 and transformer T3 type TIL3V. The start-up circuit 8 includes power to the processing unit and provides galvanic isolation of the optical unit and the processing unit through the control circuit.

Each (first 9, second 10, third 11, fourth 12, fifth 13 and sixth 14) rectifier (Fig. 6) may include: diodes VD10, VD11, resistors R42, R48, capacitors C37. Each rectifier is designed to convert AC voltage to DC voltage.

Each (first 15, second 16, third 17, fourth 18, fifth 19 and sixth 20) output filter (Fig. 6) can be performed on capacitors C43, C49. Each filter reduces output voltage ripple.

Each (first 21, second 22, third 23, fourth 24, fifth 25 and sixth 26) linear stabilizer (Fig. 6) can be performed on a DA3 chip, resistors R54, R60, capacitors C55, C61. Each linear stabilizer sets the amplitude of the output voltage and the permissible load current, and also additionally reduces the ripple of the output voltage.

The secondary switching power supply VOG works as follows.

From the input filter 1, a supply voltage of 27 V is supplied to the pulse voltage regulator 2. Switching voltage stabilizer 2 generates a stable output voltage of 12 V, which is supplied to the first 3 and second 4 voltage converters. The first 3 and second 4 voltage converters provide power to the optical unit and the processing unit, respectively. Transistors VT2, VT3 of the first voltage converter 3 alternately connect the primary windings of the first power pulse transformer 5 to the output of the pulse voltage stabilizer 2, providing the conversion of DC voltage to AC. From the second power transformer 5, the alternating voltage is supplied to the first rectifier 9, then to the first output filter 15 and the first linear stabilizer 21. Thus, after applying an external voltage, the power of the optical unit is formed. The second voltage converter 4 is in standby mode (power to the processing unit is not generated).

When applying an external constant signal (On) to turn on the power of the processing unit in the start-up circuit 8, transistors D4.A, D5.A open, and the power of the optical side (U1) is supplied to the midpoint of the primary winding of a low-power pulse transformer 7, which is necessary for galvanic isolation power supply of the optical unit and the processing unit along the trigger circuit. From the second output of the first power pulse transformer 5, a sequence of rectangular pulses (F1) is supplied to the second input of the triggering circuit 8. Triggering pulses through the triggering circuit 8 are supplied to a low-power, pulse transformer 7. As a result, from the low-power pulse transformer 7, the control pulses through resistors R32, R33 are supplied to the second input of the second voltage converter 4 - gates of transistors VT4 and VT5. The second voltage converter 4 provides an alternating connection of the primary windings of the second power pulse transformer 6 to the output of the pulse voltage stabilizer 2, as a result of which an alternating voltage is formed on the secondary windings of the second power pulse transformer 6. The second power pulse transformer 6 contains the required number of secondary windings from which the alternating voltage is supplied to the rectifiers 10, ..., 14, output filters 16, ..., 20 and linear stabilizers 22, ..., 26.

Claims (1)

A secondary pulsed power supply of a fiber-optic gyroscope containing an input filter, the input of which is the first input of a secondary pulsed power supply of a fiber-optic gyroscope, serially connected to a first power pulse transformer, a first rectifier and a first output filter, serially connected to a second rectifier and output filter connected third rectifier and output filter, characterized in that a second power pulse transformer is additionally introduced a transformer, a pulse transformer, first and second voltage converters, a starting circuit, fourth, fifth and sixth rectifiers and output filters, first, second, third, fourth fifth and sixth linear stabilizers, a pulse voltage regulator, the input of which is connected to the output of the input filter, and the output is connected through the first voltage converter to the input of the first power pulse transformer and to the first input of the second voltage converter, the output of which is connected to the input of the second power pulse the descriptor, the first, second, third, fourth and fifth outputs of which are connected respectively to the inputs of the second, third, fourth, fifth and sixth rectifiers, the outputs of the fourth, fifth and sixth rectifiers are connected respectively to the inputs of the fourth, fifth and sixth output filters, the outputs of the first, the second, third, fourth, fifth and sixth output filters are connected respectively to the inputs of the first, second, third, fourth, fifth and sixth linear stabilizers, the outputs of which are respectively the second, third, fourth, fifth and sixth outputs of the secondary switching power supply of the fiber-optic gyroscope, while the output of the first linear stabilizer is connected to the first input of the trigger circuit, the second input of which is connected to the second output of the first power pulse transformer, and the third input is the second input of the secondary switching power supply of the fiber-optic gyroscope, the output of the triggering circuit is connected via a pulse transformer to the second input of the second voltage converter.

Images