JP2011130563A - High-voltage power supply and ring laser gyro device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To realize a small-sized, low-cost, high-voltage power supply for multi-voltage output wherein fluctuation in output voltage that is not feedback controlled can also be compensated. <P>SOLUTION: The high-voltage power supply generates multiple high voltages on the secondary side using a single transformer and feeds back an output voltage from one high-voltage output terminal on the secondary side to the primary side and thereby carries out PWM control. The power supply includes a control voltage generation unit that outputs a control signal indicating a state of fluctuation in output voltage from the other high-voltage output terminal on the secondary side and a load control unit that is connected to the one high-voltage output terminal and, when any fluctuation in an output voltage from the other high-voltage output terminal is detected, changes a load to reduce an output voltage from the one high-voltage output terminal in a following manner. When an output voltage from the other high-voltage output terminal fluctuates, PWM control is carried out to compensate for the fluctuation in output voltage from the one high-voltage output terminal. In addition, fluctuation in output voltage from the other high-voltage output terminal is also compensated. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a high voltage power supply apparatus, and more particularly to a ring laser gyro apparatus.

  The ring laser gyro uses two high-voltage power supplies, + HV (about +280 V) for driving a mirror transducer that changes the optical path length, and -HV (about -600 V) for applying a cathode. As a configuration method of these two power sources, there are a method of using separate power sources and a method of generating two voltages using a single transformer. However, in the case of a method using separate power sources, the apparatus becomes large and the cost increases. Therefore, a method using one transformer is common.

  FIG. 7 shows a functional configuration example of a conventional high-voltage power supply apparatus 10 that generates two voltages using one transformer. The high voltage power supply device 10 includes a power feeding unit 11, a transformer 12, and a PWM control unit 13. The power supply unit 11 supplies, for example, a voltage of +15 V to the primary side of the transformer 12. The transformer 12 boosts the input voltage to the primary side and outputs it to the secondary side. The transformer 12 has two outputs, and the winding ratio is determined so that one output voltage is -HV and the other output voltage is + HV. Each voltage output from the transformer 12 is actually rectified by a diode, smoothed by an LC filter, and output to the outside as a DC voltage. A voltage from the power supply unit 11 is input to the primary side of the transformer 12 and a PWM waveform generated by the PWM control unit 13 is input. The PWM controller 13 feeds back the -HV voltage output from the transformer 12, compares this with a reference value, and controls the pulse width of the PWM waveform that is output so that the voltage value of -HV becomes constant.

  FIG. 8 shows a configuration example of a ring laser gyro apparatus 20 using the high voltage power supply apparatus 10. The ring laser gyro device 20 includes a high voltage power supply device 10, a control voltage generation unit 21, a mirror transducer 22, a gyro block 23, a photodiode 24, a discharge current control unit 25, a discharge unit 26, and a discharge current reading resistor 27. A reference voltage Vref of the discharge unit 26 is applied as an anode voltage to the gyro block 23 via the discharge current reading resistor 27, and −HV output from the transformer 12 is applied as a cathode voltage via the discharge current control unit 25. As a result, plasma discharge is generated, the laser medium is excited, and two laser beams in opposite directions oscillate in a ring shape in the gyro. The discharge current control unit 25 controls the amount of discharge current into the gyro by controlling the cathode voltage to be applied according to the discharge current value obtained from the voltage drop amount at the discharge current reading resistor 27. The laser light in the gyro block 23 is detected by the photodiode 24, and the intensity of the light is converted into the intensity of the current and output to the control voltage generation unit 21. The control voltage generation unit 21 is a part that generates a drive voltage for the mirror transducer 22 used for controlling the optical path length in the gyro. For example, as shown in FIG. 9, a carrier wave generator 21a, a current-voltage conversion amplifier 21b, and a multiplier 21c. And an integrator 21d, an amplifier 21e, and an adder 21f. The current input from the photodiode 24 is converted into a voltage by the current-voltage conversion amplifier 21b, and is multiplied by the carrier wave generated by the carrier wave generator 21a in the multiplier 21c. The integrator 21d integrates the output of the multiplier 21c, and outputs a value in the range of + 6.5V to + 8.5V, for example, centering on the reference value + 7.5V according to the output value of the multiplier 21c. The amplifier 21e receives + HV output from the transformer 12 and the output voltage of the integrator 21d, and converts the voltage according to the output voltage of the integrator 21d. For example, when the output voltage of the integrator 21d is + 7.5V (reference value), the integrator output is smaller than the reference value, such as 140V, 280V when + 6.5V, and 0V when + 8.5V. In some cases, a higher voltage is output, and on the other hand, a lower voltage is output if the voltage is higher. The adder 21f adds the output from the amplifier 21e and the carrier wave generated by the carrier wave generator 21a, and outputs the result as a drive voltage for the mirror transducer 22. The mirror transducer 22 is driven in accordance with the drive voltage input from the control voltage generation unit 21. For example, in the case of the integrator 21d illustrated above, the mirror transducer 22 is driven so that the optical path length is shortened when the drive voltage is increased. As the light path becomes smaller, the optical path length is increased and the light amount in the gyro is controlled to be maximized.

Japanese National Patent Publication No. 8-507194

  In the conventional high-voltage power supply device 10, −HV is fed back to the PWM control unit 13 so as to be constant, but + HV is not controlled, and −HV and + HV have no voltage. Since the power consumption is also different, + HV fluctuates. The following problems occur when + HV fluctuates. For example, when + HV is reduced, the mirror transducer drive voltage obtained by converting + HV is also reduced. As the drive voltage decreases, the amount of change in the mirror transducer decreases, thereby changing the laser oscillation frequency, resulting in an increase in the detected angular velocity error. When the drive voltage is further reduced, the lock-in control of the two laser beams performed together with the optical path length control becomes impossible in advance, so that the random walk of the angular velocity error is deteriorated by several times at the maximum. Such an error can be eliminated by returning the mirror transducer to the neutral position (referred to as reset). However, since oscillation stops at the time of reset, it becomes impossible to measure several tens of milliseconds until the mirror transducer is stabilized. As described above, the + HV fluctuation causes a problem that an error in the detected angular velocity is increased and frequent measurement is impossible. The problem caused by + HV fluctuations can be improved to some extent by reducing the tolerance of power supply components to reduce fluctuations, or designing with a margin to allow for fluctuations. New problems such as increase in power consumption and power consumption.

  The object of the present invention is to solve such problems, based on the structure of a conventional high-voltage power supply device that can be realized in a small size and at a low cost. An object of the present invention is to realize a high-voltage power supply device that can compensate for fluctuations.

  The high voltage power supply device of the present invention generates a plurality of high voltages on the secondary side using a single transformer, and feeds back the output voltage from the first high voltage output terminal on the secondary side to the primary side. A high voltage power supply apparatus that stabilizes an output voltage from the first high voltage output terminal by performing PWM control, and includes a control voltage generation unit and a load control unit.

  The control voltage generation unit outputs a control signal representing a fluctuation state of the output voltage from the second high voltage output terminal on the secondary side.

  When the load control unit is connected to the first high voltage output terminal and detects a decrease in the output voltage from the second high voltage output terminal, the load control unit changes the load to change the load from the first high voltage output terminal. The output voltage is also tracked down.

  When the output voltage from the second high voltage output terminal decreases, PWM control is performed to compensate for the decrease in the output voltage from the first high voltage output terminal, and the second high voltage It also compensates for the drop in output voltage from the output terminal.

  According to the configuration of the present invention, on the basis of the configuration of the conventional high voltage power supply device, the high voltage power supply device capable of compensating for the fluctuation of the output voltage that is not subjected to the output voltage control by feedback by adding a simple function is reduced in size. And it can be realized at low cost.

FIG. 2 is a block diagram illustrating an example of a functional configuration of a high voltage power supply apparatus 100. The figure which shows the structural example of the load control part 121. FIG. The figure which shows the structural example of the load control part 122. FIG. The block diagram which shows the function structural example of the ring laser gyro apparatus 200. FIG. FIG. 3 is a block diagram illustrating a functional configuration example of a control voltage generation unit 210. FIG. 3 is a block diagram showing a functional configuration example of a ring laser gyro apparatus 300. The block diagram which shows the function structural example of the conventional high voltage power supply device 10. FIG. The block diagram which shows the function structural example of the conventional ring laser gyro apparatus 20. FIG. The block diagram which shows the function structural example of the conventional control voltage generation part 21. FIG.

[First Embodiment]
FIG. 1 shows an example of a functional configuration of a high voltage power supply device 100 of the present invention. The high voltage power supply device 100 is obtained by adding a control voltage generation unit 110 and a load control unit 120 to the conventional high voltage power supply device 10. In the following description, the voltage reference value is described as 7.5 V, but other voltage values may be used. Moreover, although the output voltage of a high voltage power supply device is demonstrated in the case of two, three or more may be sufficient.

  As described above, the high voltage power supply device 10 outputs two high voltages + HV and −HV from the transformer 12 and feeds back −HV to the PWM control unit 13 to stabilize −HV.

  The control voltage generator 110 monitors the + HV variation state where the voltage is not stabilized, and outputs a control signal representing the variation state. The load control unit 120 is connected to the −HV high voltage output terminal of the transformer 12, and when the fluctuation of the + HV output voltage is detected by the control signal, the output voltage of −HV is also tracked by changing the load. Fluctuate. The changed -HV is fed back to the PWM control unit 13, and -HV is stabilized.

  A specific configuration example of the load control unit 120 is shown in FIG. In the configuration of FIG. 2, the control voltage generator 110 outputs a control signal voltage larger than a predetermined reference value when + HV is not lowered, and from the predetermined reference value when + HV is lowered. It is assumed that a small control signal voltage is output.

  The load control unit 121 illustrated in FIG. 2 includes a voltage dividing circuit 121a and a current control circuit 121b including a Pch FET. When a control signal voltage larger than a predetermined reference value (7.5V) is input to the voltage dividing circuit 121a, the voltage divided (for example, 1/3) by the resistors R1 and R2 is larger than 2.5V. In this case, since the impedance between the drain and source of the Pch FET is close to infinity, no current flows from the high voltage output terminal of -HV to the current control circuit 121b. On the other hand, when a control signal voltage smaller than a predetermined reference value 7.5V is input to the voltage dividing circuit 121a, the divided voltage becomes smaller than 2.5V. In this case, since the impedance between the drain and the source of the Pch FET is also reduced, a current flows between the drain and the source. Since the current flows in this manner, the power consumption of -HV is increased, and as a result, the output voltage of -HV is lowered. Therefore, the voltage drop of -HV is compensated by PWM control. In this PWM control, the duty ratio of the pulse is increased, and as a result, the power of the secondary winding on the + HV side of the transformer 12 is increased, so that the voltage of + HV is also increased and the voltage drop is compensated.

[Second Embodiment]
FIG. 3 shows another embodiment of the load control unit 120 in FIG. The load control unit 122 illustrated in FIG. 3 includes a voltage dividing circuit 122a and a current control circuit 122b including a PNP transistor. The voltage dividing circuit 122a is an inverting amplifier including an operational amplifier, a resistor R1, and a resistor R2. The power supply voltage is a single power supply operation of 15V, and the reference voltage is 7.5V. When a control signal voltage larger than a predetermined reference value (7.5V) of the control signal voltage is input to such a voltage dividing circuit 122a, the output of the inverting amplifier is output because the reference voltage of the voltage dividing circuit 122a is 7.5V. The voltage is 7.5V or less. At this time, the voltage between the base and the emitter of the PNP transistor of the power supply control circuit 122b becomes lower than 0.6V due to the resistance voltage division composed of R3 and R4, so that no current flows through the PNP transistor, so that the load control No current flows from the section 122 toward the high voltage output terminal of -HV. On the other hand, when a control signal voltage smaller than a predetermined reference value 7.5V is input to the voltage dividing circuit 122a, the output voltage of the inverting amplifier becomes larger than 0V. When the emitter voltage of the PNP transistor becomes about 0.6 V due to the resistance voltage division composed of R3 and R4, a current flows from R3, the PNP transistor through R5 toward the high voltage output terminal of -HV. Since the current flows in this manner, the power consumption of -HV is increased, and as a result, the output voltage of -HV is lowered. Therefore, the voltage drop of -HV is compensated by PWM control. In this PWM control, the duty ratio of the pulse is increased, and as a result, the power of the secondary winding on the + HV side of the transformer 12 is increased, so that the voltage of + HV is also increased and the voltage drop is compensated.

  In the above description, the case where the voltage stabilization by the PWM control using the feedback voltage is performed is -HV. However, the object for which the voltage stabilization by the PWM control using the feedback voltage is performed is + HV. It is possible to set the object of control according to the present invention to -HV by a similar method. The same applies to the following application examples.

  As described above, according to the present invention, based on the configuration of the conventional high-voltage power supply device with two voltage outputs, it is possible to compensate for fluctuations in the output voltage that is not subjected to output voltage control by feedback by adding a simple function. A high-voltage power supply device can be realized in a small size and at a low cost.

[First application example]
FIG. 4 shows a functional configuration example of a ring laser gyro apparatus 200 incorporating the high voltage power supply apparatus 100 of the present invention. The ring laser gyro apparatus 200 has the same configuration as that of the conventional ring laser gyro apparatus 20 shown in FIG. 8 except that the control voltage generation unit 21 is replaced with a control voltage generation unit 210 and a load control unit 120 is added. The unit 120 is the same as that of the first embodiment. (In the following description of the operation, the case where the load control unit 121 shown in FIG. 2 is used will be described. However, the same applies when the load control unit 122 is used. Effects can be obtained).

  FIG. 5 shows a functional configuration example of the control voltage generator 210. The control voltage generation unit 210 embodies the configuration of the control voltage generation unit 110 of the first embodiment. The control voltage generation unit 210 is the same as the conventional control voltage generation unit 21 shown in FIG. 9 including the processing contents of each component, but only in that the control signal is taken out as the output of the integrator 21d. Different.

  In the ring laser gyro apparatus 200, when + HV input to the amplifier 21e is sufficiently larger than the driving voltage of the mirror transducer, the optical path length is optimally controlled and the laser light quantity is maximized. Therefore, the output of the integrator 21d is larger than the reference value 7.5V, and the control voltage divided by the resistance in the load control unit 121 is larger than 2.5V. In this case, since the impedance between the drain and source of the Pch FET is close to infinity, no current flows from the load control unit 121 to the high voltage output terminal of −HV. On the other hand, when + HV becomes small and becomes a voltage close to the driving voltage of the mirror transducer, the current taken out by the photodiode 24 also becomes small. Therefore, the output of the integrator 21d eventually becomes smaller than the reference value 7.5V, and the load The control voltage divided by resistance in the control unit 121 is also smaller than 2.5V. In this case, since the impedance between the drain and the source of the PchFET is also reduced, a current flows between the drain and the source toward the high voltage output terminal of -HV. Since the current flows in this manner, the power consumption of -HV is increased, and as a result, the output voltage of -HV is lowered. Therefore, the voltage drop of -HV is compensated by PWM control. In this PWM control, the duty ratio of the pulse is increased, and as a result, the power of the secondary winding on the + HV side of the transformer 12 is increased, so that the voltage of + HV is also increased and the voltage drop is compensated.

  As described above, according to the present invention, based on the configuration of a conventional ring laser gyro device, a ring laser gyro device incorporating a high voltage power supply device capable of compensating for + HV voltage fluctuations by adding a simple function, It can be realized at a small size and at a low cost.

[Second application example]
FIG. 6 shows a functional configuration example of the ring laser gyro apparatus 300 of the present invention. In this example, unlike the first application example, -HV is controlled so that the discharge current value becomes constant. Therefore, + HV is not constant, but is stabilized at a voltage value that makes the discharge current value constant. The The ring laser gyro apparatus 300 includes a power supply unit 11, a transformer 12, a PWM control unit 13, a control voltage generation unit 210, a load control unit 120, a mirror transducer 22, a gyro block 23, a photodiode 24, a discharge unit 26, and a discharge current reading resistor. 27, an integrator 310, and an inverting amplifier 320. Among these, the components other than the integrator 310 and the inverting amplifier 320 are the same as the components of the ring laser gyro apparatus 200 of the present invention shown in FIG. In other words, the discharge current control unit 25 is replaced with an integrator 310 and an inverting amplifier 320 on the components.

  In the ring laser gyro apparatus 200, the discharge current control unit 25 obtains the discharge current value from the voltage drop amount in the discharge current reading resistor 27, and controls the discharge current amount by changing the cathode voltage based on this value. In the gyro apparatus 300, by changing the output of the integrator 310 based on the voltage after the voltage drop in the discharge current reading resistor 27, the duty ratio of the PWM control unit 13 is controlled to change -HV, which is directly applied. Apply to the cathode. Specifically, the following processing is performed. First, the integrator 310 integrates the difference between the voltage after the voltage drop in the discharge current reading resistor 27 and the reference value connected to the integrator 310. Here, the reference value is set in advance based on a desired amount of discharge current. At this time, when it becomes larger than the desired amount of discharge current, the voltage after the voltage drop in the discharge current reading resistor 27 becomes smaller than the reference value. For this reason, the output of the integrator 310 increases, but the output decreases conversely through the inverting amplifier 320, and when this is input to the PWM control unit 13, the PWM control unit 13 decreases the duty ratio of the pulse. To work. When the duty ratio decreases, the output voltages + HV and -HV on the secondary side of the transformer 12 both decrease. As a result, the cathode voltage is reduced, and the discharge current is also reduced. In this way, the discharge current can be controlled. The + HV fluctuation compensation method is the same as that of the ring laser gyro 200.

  According to the configuration of the ring laser gyro apparatus 300 described above, the accuracy of the discharge current control is slightly inferior to that of the ring laser gyro apparatus 200, but the apparatus is small and low because the configuration does not include the discharge current control unit 25 having a complicated configuration. Cost can be reduced.

10, 100 High voltage power supply device 20, 200, 300 Ring laser gyro device 121a, 122a Voltage dividing circuit 121b, 122b Current control circuit

Claims (4)

By generating a plurality of high voltages on the secondary side using a single transformer and performing PWM control by feeding back the output voltage from the first high voltage output terminal on the secondary side to the primary side, A high voltage power supply device that stabilizes an output voltage from one high voltage output terminal,
A control voltage generating unit that receives an output voltage from the second high-voltage output terminal on the secondary side and outputs a control signal indicating a fluctuation state of the voltage;
The first high-voltage output terminal is connected to the first high-voltage output terminal, and when a drop in the output voltage from the second high-voltage output terminal is detected by the control signal, the load is changed to change the first high-voltage output terminal. A load control unit that also decreases the output voltage from
With
When the output voltage from the second high voltage output terminal decreases, the PWM control is performed to compensate for the decrease in the output voltage from the first high voltage output terminal, and the second high voltage output terminal. A high-voltage power supply device that compensates for a drop in the output voltage from the voltage output terminal. The high voltage power supply device according to claim 1,
The load control unit
A voltage dividing circuit for dividing the control signal;
A current control circuit for controlling an output current by changing a load of the first high-voltage output terminal according to the divided control signal;
A high-voltage power supply device comprising:   A ring laser gyro apparatus comprising the high-voltage power supply apparatus according to claim 1. A ring laser gyro apparatus according to claim 3,
A mirror transducer as a drive mechanism for adjusting the optical path length of the ring laser gyro;
A photodiode that detects the laser light in the ring laser gyro and takes out the intensity as the strength of the current;
With
The control voltage generator is
A carrier generator for generating a carrier;
A current-voltage conversion amplifier that converts the output current into a voltage and outputs the voltage; and
A multiplier for multiplying the output of the current-voltage conversion amplifier by the carrier wave;
An integrator for integrating the output of the multiplier and outputting the control signal;
An amplifier that adjusts and outputs the intensity of the output voltage from the other high-voltage output terminal according to the value of the control signal;
An adder for adding the output of the amplifier and the carrier wave and outputting the drive voltage of the mirror transducer;
A ring laser gyro apparatus comprising:

Images