JP2008226002A - Power control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the output of any necessary zero cross signal even when voltage drop is generated. <P>SOLUTION: This power adjusting device is provided with a zero cross signal output circuit 16 for outputting the zero cross signal of an AC power supply voltage; a phase control circuit 17 for outputting a phase control signal based on a triangular wave signal and a temperature control signal generated based on the zero cross signal; and a triac 19 for outputting load currents corresponding to the trigger signal of the phase control signal. The zero cross signal output circuit is provided with a zero cross signal output control part 31 which starts the output of the zero cross signal when the AC power supply voltage from +potential to -potential becomes a minus side set voltage threshold or less, and ends the output when an inversion voltage from -potential to +potential becomes a plus side set voltage threshold or more, and starts the output of the zero cross signal when the inversion voltage from +potential to -potential becomes the minus side set voltage threshold or less, and ends the output when the AC power supply from -potential to +potential becomes the plus side set voltage threshold or more. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a power adjustment device that outputs a desired load current by controlling the phase of an AC power supply voltage, for example.

  FIG. 6 is a block diagram showing a schematic configuration inside a conventional power adjustment apparatus.

  6 is disposed between the AC power supply 2 and the load circuit 3 and controls the phase of the AC power supply voltage from the AC power supply 2 through the input terminal 101 to adjust the temperature of the temperature regulator 4. In response to the signal, a desired load current corresponding to the AC power supply voltage of the load power supply 3A (AC power supply 2) inside the load circuit 3 is supplied and output to the load 3B inside the load circuit 3 through the output terminal 102 (for example, Patent Document 1).

  The power adjustment apparatus 100 includes a transformer circuit 103 that outputs an AC power supply voltage from the AC power supply 2 through an input terminal 101 as a transformer, and a full wave that performs full-wave rectification on both positive and negative output voltages that are output by the transformer circuit 103. From the rectifier circuit 104, a power supply circuit 105 that supplies power to the entire power conditioner 100 based on the both-side output voltage that is full-wave rectified by the full-wave rectifier circuit 104, that is, the full-wave rectifier voltage, A zero-cross signal output circuit 106 that detects the zero phase of the AC power supply voltage and outputs a zero-cross signal based on the full-wave rectified voltage, and generates a triangular wave signal based on the zero-cross signal from the zero-cross signal output circuit 106 The phase of the AC power supply voltage is controlled based on this triangular wave signal and the temperature adjustment signal of 4 mA to 20 mA of the temperature regulator 4. A phase control circuit 107 that outputs a control signal, a trigger circuit 108 that outputs a trigger signal corresponding to the phase control signal, a triac 109 that outputs a load current corresponding to an AC power supply voltage corresponding to the trigger signal, and the load A snubber circuit 110 that suppresses overvoltage of the current and outputs the load current to the load circuit 3 through the output terminal 102 and a frequency determination circuit 111 that determines the power supply frequency of the AC power supply 2 are provided.

  FIG. 7 is a timing chart showing the processing operation of the power adjustment apparatus 100 until a desired load current is generated and output from the AC power supply voltage.

  The full-wave rectifier circuit 104 generates a full-wave rectified voltage B by full-wave rectifying the AC power supply voltage (both sides output voltage) A from the AC power supply 2 through the input terminal 101.

  The zero cross signal output circuit 106 uses the frequency determination result of the frequency determination circuit 111, and of the full wave rectified voltage B, the full wave rectified voltage B that shifts from a high potential to a low potential is fixed on the plus side near the zero phase. When the voltage threshold is lower than the threshold voltage, the output of the zero cross signal C is started. When the full wave rectified voltage B of the full wave rectified voltage B, which shifts from the low potential to the high potential, exceeds the positive fixed voltage threshold, The output of the signal C is terminated.

  The phase control circuit 107 generates a triangular wave signal every half cycle of the AC power supply voltage by a charge / discharge circuit composed of a resistor, a capacitor and the like using the zero cross signal C as a trigger. The generation of the triangular wave signal D is started in accordance with the output end timing, the generation of the triangular wave signal D is ended in accordance with the output start timing of the next zero cross signal C, and the triangular wave signal D is generated and output. Thus, the phase control signal F corresponding to the time width of the intersection of the triangular wave signal D and the temperature adjustment signal E of the temperature controller 4 is output.

  Further, the trigger circuit 108 outputs a trigger signal G corresponding to the phase control signal F. As a result, the triac 109 outputs a load current H corresponding to the trigger signal G. Note that the output amount of the load current H is to adjust a desired output amount according to the temperature adjustment signal E of the temperature regulator 4.

As described above, according to the conventional power conditioner 100, the zero cross signal C is generated based on the full wave rectified voltage B obtained by full wave rectification of the stable AC power supply voltage A and the positive fixed voltage threshold value. A triangular wave signal D is generated based on the triangular wave signal D, a phase control signal F corresponding to the temperature adjustment signal E of the temperature regulator 4 is output based on the triangular wave signal D, and a trigger signal G corresponding to the phase control signal F is supported. Since the load current H corresponding to the AC power supply voltage is output, the desired load current H corresponding to the temperature adjustment signal E from the temperature controller 4 is supplied to the load circuit 3 from the stable AC power supply voltage A. can do.
Japanese Patent Laying-Open No. 2005-346475 (see paragraph numbers “0054” to “0057” and FIGS. 18 and 19)

  However, in such a conventional power adjustment device 100, the zero-cross signal output circuit 106 uses the full-wave rectified voltage B that shifts from a high potential to a low potential among the full-wave rectified voltages B as the positive fixed voltage threshold value. The output of the zero cross signal C is started when the frequency becomes below, and when the full wave rectified voltage B of the full wave rectified voltage B that shifts from the low potential to the high potential becomes equal to or higher than the positive fixed voltage threshold, By terminating the output, a zero cross signal C is generated, and based on this zero cross signal C, a triangular wave signal D serving as a reference for phase control is generated. For example, the AC power source of the AC power source 2 is used overseas. In a region where the voltage is unstable, as shown in FIG. 8, for example, a large voltage drop α occurs in the AC power supply voltage A due to the influence of voltage distortion or noise, and the full-wave rectified voltage B is generated by the generation of the voltage drop α. Positive side fixing If the voltage threshold value is not reached, an unnecessary zero cross signal β is output at a timing other than the output timing of the true zero cross signal C. Therefore, in the half cycle period of the AC power supply voltage due to the influence of this unnecessary zero cross signal β. A plurality of triangular wave signals are generated, and the normal phase control cannot be performed due to the disturbance of the triangular wave signals. As a result, the output amount of the desired load current H according to the temperature adjustment signal E cannot be obtained. .

  In addition, considering the voltage drop α of the AC power supply voltage, it is possible to simply lower the positive fixed voltage threshold, but if the positive fixed voltage threshold is lowered too much, the time width of the zero cross signal becomes extremely narrow. There is a risk of false firing at the time of commutation in which the next half cycle of the AC power supply voltage is fully turned on.

  The present invention has been made in view of the above points, and the object of the present invention is to ensure the occurrence of false firing at the time of commutation even when voltage drop occurs due to voltage distortion of the AC power supply voltage or noise. To provide a power adjustment device that can reliably prevent unnecessary zero-crossing signal output and ensure normal phase control of the AC power supply voltage, thereby obtaining a desired load current amount. It is in.

  To achieve the above object, the power adjustment device of the present invention detects a zero phase of an AC power supply voltage and outputs a zero cross signal, and generates a triangular wave signal based on the zero cross signal. Based on the triangular wave signal and the command signal, phase control means for outputting a phase control signal for controlling the phase of the AC power supply voltage, trigger signal output means for outputting a trigger signal corresponding to the phase control signal, and the trigger signal And a switching control element that outputs a load current corresponding to an alternating current power supply voltage corresponding to the above, wherein the zero cross signal output means shifts from a positive potential to a negative potential in the alternating current power supply voltage. When the AC power supply voltage falls below the negative set voltage threshold value near the zero phase, the output of the zero cross signal is started and the polarity of the AC power supply voltage is inverted. When the polarity reversal voltage that shifts from a negative potential to a positive potential exceeds the positive set voltage threshold value near the zero phase, the output of the zero cross signal is terminated, and the positive polarity reversal voltage When the polarity reversal voltage that shifts from a potential to a negative potential falls below the negative side set voltage threshold, the zero cross signal starts to be output, and the AC power source that shifts from a negative potential to a positive potential among the AC power supply voltages A zero cross signal output control means is provided for terminating the output of the zero cross signal when the voltage becomes equal to or greater than the plus side set voltage threshold.

  Therefore, according to the power adjustment device of the present invention, when the AC power supply voltage that shifts from the positive potential to the negative potential among the AC power supply voltages becomes equal to or lower than the negative set voltage threshold value near the zero phase, the zero cross signal When the polarity reversal voltage that shifts from a negative potential to a positive potential among the polarity reversal voltages of the AC power supply voltage is equal to or higher than the positive set voltage threshold value near the zero phase, the zero cross signal is output. When the polarity reversal voltage that shifts from the positive potential to the negative potential is equal to or lower than the negative side set voltage threshold, the output of the zero cross signal is started and the AC power supply voltage is When the AC power supply voltage that shifts from a negative potential to a positive potential becomes equal to or higher than the positive side set voltage threshold, the output of the zero cross signal is terminated. Therefore, even if a voltage drop occurs in the AC power supply voltage, it is possible to reliably prevent unnecessary zero-cross signal output while reliably preventing the occurrence of false firing during commutation. Normal phase control of the voltage is ensured, and as a result, a desired load current amount can be obtained.

  Further, in the power adjustment device of the present invention, the zero cross signal output control means is configured such that the AC power supply voltage that shifts from a positive potential to a negative potential among the AC power supply voltages is equal to or less than a negative set voltage threshold value near the zero phase. And whether or not the AC power supply voltage that shifts from the negative potential to the positive potential is greater than or equal to the positive set voltage threshold value near the zero phase in the AC power supply voltage. A voltage determining means for determining whether or not the polarity reversal voltage that shifts from a negative potential to a positive potential among the polarity reversal voltages of the AC power supply voltage is equal to or greater than the positive-side set voltage threshold; The polarity reversal voltage for determining whether or not the polarity reversal voltage that shifts from the positive potential to the negative potential is equal to or lower than the negative side set voltage threshold. When the AC power supply voltage that shifts from the positive potential to the negative potential by the determination means and the voltage determination means falls below the negative side set voltage threshold, the output of the first comparator signal is started, and the positive potential is increased from the negative potential. When the AC power supply voltage that shifts to a potential becomes greater than or equal to the positive-side set voltage threshold, the first comparator signal output means for terminating the output of the first comparator signal and the negative potential at the polarity reversal voltage determination means When the polarity reversal voltage that shifts from the positive potential to the positive potential exceeds the positive set voltage threshold, the output of the second comparator signal is terminated, and the polarity reversal voltage that shifts from the positive potential to the negative potential is set to the negative side A second comparator signal output means for starting the output of the second comparator signal when the voltage is equal to or lower than a voltage threshold; And, may be output the zero-cross signal in the AND condition of the outputs of said second comparator signal of the first comparator signal.

  Therefore, according to the power adjustment device of the present invention, when the AC power supply voltage that shifts from the positive potential to the negative potential by the voltage determination unit becomes equal to or lower than the negative side set voltage threshold, the first comparator signal is output. When the AC power supply voltage that starts and shifts from the minus potential to the plus potential becomes equal to or higher than the plus side set voltage threshold value, the output of the first comparator signal is terminated, and the polarity inversion voltage determining means determines the minus voltage. When the polarity reversal voltage that shifts from the potential to the positive potential is equal to or greater than the positive side set voltage threshold, the output of the second comparator signal is terminated, and the polarity reversal voltage that shifts from the positive potential to the negative potential is When the voltage falls below a set voltage threshold, the output of the second comparator signal is started, and the output of the first comparator signal is Since the zero cross signal is output under the AND condition with the output of the second comparator signal, even if a voltage drop occurs in the AC power supply voltage, it is ensured that erroneous firing during commutation occurs. While preventing, the output of an unnecessary zero cross signal is surely prevented to ensure the normal phase control of the AC power supply voltage, and as a result, a desired load current amount can be obtained.

  Further, in the power adjustment device of the present invention, the zero cross signal output means is configured such that the full-wave rectified voltage that shifts from a high potential to a low potential among the full-wave rectified voltages of the AC power supply voltage is a plus near the zero phase. When the threshold voltage is equal to or lower than the fixed side voltage threshold value, the output of the correction zero cross signal is started, and the full wave rectified voltage that shifts from the low potential to the high potential is equal to or higher than the positive fixed voltage threshold value. A correction zero-cross signal output control means for terminating the output of the correction zero-cross signal, and the phase control means outputs the zero-cross signal and the correction zero-cross signal output of the zero-cross signal output control means. You may make it have a triangular wave signal production | generation means which produces | generates the said triangular wave signal based on the said correction | amendment zero cross signal of a control means.

  Therefore, according to the power adjustment device of the present invention, the full-wave rectified voltage that shifts from a high potential to a low potential among the full-wave rectified voltages of the AC power supply voltage is less than or equal to the positive fixed voltage threshold value near the zero phase. Then, the output of the correction zero cross signal is started, and when the full wave rectified voltage that shifts from the low potential to the high potential among the full wave rectified voltages becomes equal to or greater than the positive fixed voltage threshold, the correction zero cross signal Since the output of the signal is terminated, the triangular wave signal is generated based on the zero cross signal of the zero cross signal output control means and the correction zero cross signal of the correction zero cross signal output control means. Even if the zero cross signal is generated at a timing slightly later than the true zero cross timing, use the conventional zero cross signal based on the full-wave rectified voltage, that is, the correction zero cross signal. The occurrence of false firing at the commutation can be reliably prevented.

  Further, in the power adjustment device of the present invention, the triangular wave signal generation means starts generating the triangular wave signal according to the output end timing of the zero cross signal, and according to the output start timing of the correction zero cross signal. Then, the generation of the triangular wave signal may be terminated.

  Therefore, according to the power adjustment device of the present invention, the generation of the triangular wave signal is started according to the output end timing of the zero cross signal, and the generation of the triangular wave signal is started according to the output start timing of the correction zero cross signal. Since the triangular wave signal does not cross the true zero cross timing, the occurrence of false firing at the time of commutation can be reliably prevented.

  In order to achieve the above object, the power adjustment device of the present invention detects a zero phase of the AC power supply voltage and outputs a zero cross signal, and generates a triangular wave signal based on the zero cross signal. A phase control means for outputting a phase control signal for controlling the phase of the AC power supply voltage based on the triangular wave signal and the command signal; a trigger signal output means for outputting a trigger signal corresponding to the phase control signal; and And a switching control element that outputs a load current corresponding to the AC power supply voltage corresponding to the trigger signal, wherein the zero cross signal output means shifts from a negative potential to a positive potential in the AC power supply voltage. When the AC power supply voltage to be exceeded becomes the first plus side set voltage threshold value near the zero phase, the plus potential side zero cross signal is output as the zero cross signal. And the output of the positive potential side zero cross signal is terminated and the AC power supply voltage is increased when the first positive side set voltage threshold value is exceeded and the second positive side set voltage threshold value near the zero phase is reached. When the AC power supply voltage that shifts from the positive potential to the negative potential becomes equal to or lower than the first negative side set voltage threshold value near the zero phase, the output of the negative potential side zero cross signal is started as the zero cross signal. The zero cross signal output control means for terminating the output of the negative potential side zero cross signal when the negative side set voltage threshold value is less than or equal to 1 minus side set voltage threshold value and below the second negative side set voltage threshold value near the zero phase. After the output of the positive potential side zero cross signal, the signal output control means is configured to output the first positive side until the output of the negative potential side zero cross signal is completed. The voltage threshold value determining operation of the constant voltage threshold value and the second positive side set voltage threshold value is prohibited, and after the output of the negative potential side zero cross signal is finished, the first negative side signal is output until the output of the positive potential side zero cross signal is finished. The voltage threshold value judgment operation of the side set voltage threshold value and the second minus side set voltage threshold value is prohibited.

  Therefore, according to the power adjustment device of the present invention, when the AC power supply voltage that shifts from the negative potential to the positive potential among the AC power supply voltages becomes equal to or higher than the first positive side set voltage threshold value near the zero phase, The output of the positive potential side zero cross signal is started as a cross signal, and when the positive potential side zero cross signal is equal to or higher than the first positive side set voltage threshold and equal to or higher than the second positive side set voltage threshold near the zero phase, When the output is terminated and the AC power supply voltage that shifts from the positive potential to the negative potential is equal to or lower than the first negative set voltage threshold value in the vicinity of the zero phase, the zero cross signal is set to the negative potential side. When the output of the zero crossing signal is started and becomes equal to or less than the first minus side set voltage threshold value and below the second minus side set voltage threshold value near the zero phase, The output of the negative potential side zero cross signal is terminated, and after the output of the positive potential side zero cross signal is terminated, the output of the first plus side set voltage threshold and the second are continued until the output of the negative potential side zero cross signal is terminated. The voltage threshold determination operation of the plus side set voltage threshold is prohibited, and after the output of the minus potential side zero cross signal is finished, the first minus side set voltage threshold and the first threshold value are output until the output of the plus potential side zero cross signal is finished. Since the voltage threshold judgment operation for the minus side set voltage threshold is prohibited, even if a drop voltage is generated in the AC power supply voltage, it is possible to prevent the occurrence of false firing at the time of commutation and After the output of the signal is completed, the output of the unnecessary zero cross signal is reliably prevented by reversing the polarity of the set voltage threshold until the output of the next zero cross signal is completed. To ensure proper phase control, as a result, it is possible to output a desired load current.

  Further, in the power adjustment device of the present invention, the zero cross signal output means is configured such that the full-wave rectified voltage that shifts from a high potential to a low potential among the full-wave rectified voltages of the AC power supply voltage is a plus near the zero phase. When the threshold voltage is equal to or lower than the fixed side voltage threshold value, the output of the correction zero cross signal is started, and the full wave rectified voltage that shifts from the low potential to the high potential is equal to or higher than the positive fixed voltage threshold value. A correction zero-cross signal output control means for terminating the output of the correction zero-cross signal, and the phase control means outputs the zero-cross signal and the correction zero-cross signal output of the zero-cross signal output control means. You may make it have a triangular wave signal production | generation means which produces | generates the said triangular wave signal based on the said correction | amendment zero cross signal of a control means.

  Therefore, according to the power adjustment device of the present invention, the full-wave rectified voltage that shifts from a high potential to a low potential among the full-wave rectified voltages of the AC power supply voltage is less than or equal to the positive fixed voltage threshold value near the zero phase. Then, the output of the correction zero cross signal is started, and when the full wave rectified voltage that shifts from the low potential to the high potential among the full wave rectified voltages becomes equal to or greater than the positive fixed voltage threshold, the correction zero cross signal Since the output of the signal is terminated, the triangular wave signal is generated based on the zero cross signal of the zero cross signal output control means and the correction zero cross signal of the correction zero cross signal output control means. Even if the zero cross signal is generated at a timing slightly later than the true zero cross timing, use the conventional zero cross signal based on the full-wave rectified voltage, that is, the correction zero cross signal. The occurrence of false firing at the commutation can be reliably prevented.

  Further, in the power adjustment device of the present invention, the triangular wave signal generation means starts generating the triangular wave signal according to the output end timing of the zero cross signal, and according to the output start timing of the correction zero cross signal. Then, the generation of the triangular wave signal may be terminated.

  Therefore, according to the power adjustment device of the present invention, the generation of the triangular wave signal is started according to the output end timing of the zero cross signal, and the generation of the triangular wave signal is started according to the output start timing of the correction zero cross signal. Since the triangular wave signal does not cross the true zero cross timing, the occurrence of false firing at the time of commutation can be reliably prevented.

  According to the power adjustment device of the present invention configured as described above, when the AC power supply voltage that shifts from the positive potential to the negative potential among the AC power supply voltages becomes equal to or lower than the negative-side set voltage threshold value near the zero phase, When the output of the cross signal is started and the polarity inversion voltage that shifts from the negative potential to the positive potential among the polarity inversion voltages of the AC power supply voltage becomes equal to or higher than the positive side set voltage threshold value near the zero phase, the zero cross signal The output of the zero cross signal is started when the polarity reversal voltage that shifts from the positive potential to the negative potential becomes equal to or lower than the negative side set voltage threshold. When the AC power supply voltage that shifts from a negative potential to a positive potential among the voltages becomes equal to or higher than the positive side set voltage threshold, the zero cross signal is output. Therefore, even if a voltage drop occurs in the AC power supply voltage, it is possible to reliably prevent unnecessary zero cross signal output while reliably preventing false firing during commutation. Normal phase control of the power supply voltage is ensured, and as a result, a desired load current amount can be obtained.

  The power adjustment apparatus according to the first embodiment of the present invention will be described below based on the drawings. FIG. 1 is a block diagram showing a schematic configuration inside the power adjustment apparatus according to the first embodiment of the present invention.

  1 is arranged between the AC power supply 2 and the load circuit 3, and controls the phase of the AC power supply voltage from the AC power supply 2 through the input terminal 11 to generate a temperature adjustment signal of the temperature regulator 4. Accordingly, a desired load current corresponding to the AC power supply voltage of the load power supply 3A (AC power supply 2) in the load circuit 3 is supplied to the load 3B in the load circuit 3 through the output terminal 12.

  The power adjustment apparatus 1 includes a transformer circuit 13 that outputs an AC power supply voltage from the AC power supply 2 through an input terminal 11 as a transformer, and a full-wave rectifier that performs full-wave rectification on both the positive and negative output voltages output by the transformer circuit 13. A rectifier circuit 14, a power supply circuit 15 that supplies power to the entire power conditioner 1 based on a double-sided output voltage that is full-wave rectified by the full-wave rectifier circuit 14, that is, a full-wave rectified voltage, and a zero phase of the AC power supply voltage , And generates a triangular wave signal based on the zero cross signal from the zero cross signal output circuit 16, and outputs the triangular wave signal and the temperature regulator 4 from 4 mA to 4 mA. A phase control circuit 17 for outputting a phase control signal for controlling the phase of the AC power supply voltage based on the temperature adjustment signal of 20 mA, and a trigger corresponding to the phase control signal. A trigger circuit 18 that outputs a signal, a triac 19 that outputs a load current corresponding to the AC power supply voltage corresponding to the trigger signal, an overvoltage of the load current is suppressed, and the load current is supplied to the load circuit 3 through the output terminal 12. And a frequency determination circuit 21 for determining the power supply frequency of the AC power supply 2.

  FIG. 2 is a block diagram showing a schematic configuration inside the zero cross signal output circuit 16 according to the first embodiment.

  The zero cross signal output circuit 16 shown in FIG. 2 includes a zero cross signal output control unit 31 that drives and controls the output start timing and output end timing of the zero cross signal of the AC power supply voltage based on the output voltage of the transformer circuit 13. A correction zero cross signal output control unit 32 for driving and controlling the output start timing and output end timing of the correction zero cross signal for the AC power supply voltage based on the output voltage of the wave rectification circuit 14, that is, the full wave rectification voltage. ing.

  The zero cross signal output control unit 31 includes a voltage determination unit 31A that determines the AC power supply voltage, that is, the output voltage of the transformer circuit 13 with a set voltage threshold value near zero phase, and the polarity inversion voltage of the AC power supply voltage, that is, the transformer circuit 13 A polarity reversal voltage determination unit 31B that determines a polarity reversal voltage with a set voltage threshold value near zero phase; a first comparator signal output unit 31C that outputs a first comparator signal based on a determination result of the voltage determination unit 31A; Based on the determination result of the polarity reversal voltage determination unit 31B, the second comparator signal output unit 31D that outputs the second comparator signal, the first comparator signal output and the second comparator of the first comparator signal output unit 31C. And an AND circuit 31E that outputs a zero cross signal under an AND condition of the second comparator signal output of the signal output unit 31D.

  The voltage determination unit 31A determines whether the output voltage that shifts from the positive potential to the negative potential among the output voltages of the transformer circuit 13 is equal to or lower than the negative set voltage threshold value (−0.1 V) near the zero phase. At the same time, it is determined whether or not the output voltage that shifts from the minus potential to the plus potential among the output voltages is equal to or greater than the plus side set voltage threshold (+4.7 V) near the zero phase.

  The polarity reversal voltage determination unit 31B determines whether or not the polarity reversal voltage that shifts from the negative potential to the positive potential among the polarity reversal voltages of the transformer circuit 13 is equal to or higher than the positive set voltage threshold (+4.7 V) near zero phase. And whether or not the polarity reversal voltage that shifts from the positive potential to the negative potential is equal to or lower than the negative set voltage threshold (−0.1 V) near the zero phase. .

  In the first comparator signal output unit 31C, when the output voltage that shifts from the plus potential to the minus potential among the output voltages of the transformer circuit 13 in the voltage determination unit 31A becomes equal to or less than the minus side set voltage threshold (−0.1V). The output of the first comparator signal is started, and the output voltage that shifts from the negative potential to the positive potential among the output voltages of the transformer circuit 13 at the voltage determination unit 31A is greater than or equal to the positive set voltage threshold (+4.7 V). Then, the output of the first comparator signal is terminated.

  In the second comparator signal output unit 31D, the polarity reversal voltage that shifts from the positive potential to the negative potential among the polarity reversal voltages of the transformer circuit 13 in the polarity reversal voltage determination unit 31B is a negative set voltage threshold (−0.1V). ) When the following occurs, the output of the second comparator signal is started, and the polarity inversion voltage that shifts from the minus potential to the plus potential among the polarity inversion voltages of the transformer circuit 13 in the polarity inversion voltage determination unit 31B is the plus side set voltage. When the threshold value (+4.7 V) or more is reached, the output of the second comparator signal is terminated.

  The AND circuit 31E outputs a zero cross signal according to the AND condition of the output of the first comparator signal of the first comparator signal output unit 31C and the output of the second comparator signal of the second comparator signal output unit 31D. Is.

  In addition, the correction zero-cross signal output control unit 32 sets the full-wave rectified voltage that shifts from the high potential to the low potential out of the full-wave rectified voltage of the full-wave rectifier circuit 14 to be equal to or less than the positive fixed voltage threshold value near the zero phase. Then, the output of the correction zero-cross signal is started, and when the full-wave rectified voltage that shifts from the low potential to the high potential among the full-wave rectified voltage exceeds the positive side fixed voltage threshold, the correction zero-cross signal is output. It ends. The correction zero-cross signal output control unit 32 corresponds to the zero-cross signal output circuit 106 described in the prior art.

  The phase control circuit 17 generates a triangular wave signal that generates a triangular wave signal serving as a reference for phase control based on the zero cross signal of the zero cross signal output control unit 31 and the correction zero cross signal of the correction zero cross signal output control unit 32. Using the frequency determination result of the unit 17A and the frequency determination circuit 21, a phase control signal corresponding to the time width of the intersection of the triangular wave signal generated by the triangular wave signal generation unit 17A and the temperature adjustment signal of the temperature controller 4 is obtained. And a phase control unit 17B for outputting.

  The triangular wave signal generation unit 17A is an AC charging / discharging circuit configured by resistors, capacitors, and the like, triggered by the zero cross signal of the zero cross signal output control unit 31 and the correction zero cross signal of the correction zero cross signal output control unit 32. A triangular wave signal is generated every half cycle of the power supply voltage, and the generation of the triangular wave signal is started in accordance with the output end timing of the zero cross signal of the zero cross signal output control unit 31, and the correction zero cross signal output control is performed. The triangular wave signal is generated by terminating the generation of the triangular wave signal in accordance with the output start timing of the correction zero cross signal of the unit 32. The reason for using the zero cross signal and the correction zero cross signal in the triangular wave signal generation unit 17A is that the zero cross signal output from the zero cross signal output control unit 31 is output at a timing slightly beyond the true zero cross timing. Therefore, if the generation of the triangular wave signal is started according to the output start timing of the zero cross signal, and the generation of the triangular wave signal is terminated at the output end timing of the next zero cross signal, the triangular wave signal is true. Since there is a possibility of erroneous firing at the time of commutation across the zero cross timing, the timing to end the generation of the triangular wave signal is about 0.3 m to 0.5 m seconds earlier than the true zero cross timing. Using the correction zero cross signal output start timing, the triangular wave signal does not straddle the true zero cross timing, and erroneous firing at the time of commutation is reliably prevented. It is.

  The trigger circuit 18 outputs a trigger signal corresponding to the phase control signal of the phase control circuit 17.

  The triac 19 outputs a load current corresponding to the trigger signal, suppresses the overvoltage of the load current by the snubber circuit 20, and supplies and outputs the load current that suppresses the overvoltage to the load circuit 3 through the output terminal 12. It is. The output amount of the load current is to adjust a desired output amount according to the temperature adjustment signal of the temperature controller 4.

  The power adjustment device described in claim 1 is the power adjustment device 1, the zero cross signal output means is the zero cross signal output circuit 16, the phase control means is the phase control circuit 17, the trigger signal output means is the trigger circuit 18, and the switching control element is The triac 19, the zero cross signal output control means is the zero cross signal output control section 31, the voltage determination means is the voltage determination section 31A, the polarity inversion voltage determination means is the polarity inversion voltage determination section 31B, and the first comparator signal output means is the first. The comparator signal output section 31C, the second comparator signal output means is the second comparator signal output section 31D, the correction zero cross signal output control means is the correction zero cross signal output control section 32, and the triangular wave signal generation means is the triangular wave signal. This corresponds to the generation unit 17A.

  Next, the operation of the power adjustment apparatus 1 showing the first embodiment will be described. FIG. 3 is a timing chart showing the processing operation until the triangular wave signal is generated and output from the AC power supply voltage of the power adjustment apparatus 1 according to the first embodiment.

  Assume that a voltage drop α occurs in the AC power supply voltage from the AC power supply 2.

  The voltage determination unit 31 </ b> A obtains the output voltage K through the transformer circuit 13 based on the AC power supply voltage J from the AC power supply 2.

  Similarly, the polarity inversion voltage determination unit 31 </ b> B obtains the polarity inversion voltage L of the output voltage K through the transformer circuit 13 based on the AC power supply voltage J from the AC power supply 2.

  The voltage determination unit 31A determines whether or not the output voltage K that shifts from the positive potential to the negative potential among the output voltages K of the transformer circuit 13 has become equal to or lower than the negative side set voltage threshold (−0.1 V). It is determined whether or not the output voltage K that shifts from the minus potential to the plus potential is equal to or higher than the plus side set voltage threshold (+4.7 V).

  The first comparator signal output unit 31C outputs the first comparator signal M when the output voltage K that shifts from the positive potential to the negative potential is equal to or lower than the negative side set voltage threshold (−0.1 V) in the voltage determination unit 31A. The output is started, and when the output voltage K that shifts from the negative potential to the positive potential is equal to or higher than the positive side set voltage threshold (+4.7 V) in the voltage determination unit 31A, the output of the first comparator signal M is ended. Become.

  Further, the polarity reversal voltage determination unit 31B determines whether or not the polarity reversal voltage L that shifts from the positive potential to the negative potential among the polarity reversal voltages L of the transformer circuit 13 is equal to or lower than the negative side set voltage threshold (−0.1 V). And whether or not the polarity reversal voltage L that shifts from the minus potential to the plus potential is equal to or higher than the plus side set voltage threshold (+4.7 V).

  When the polarity reversal voltage L that shifts from the positive potential to the negative potential is equal to or lower than the negative side set voltage threshold (−0.1 V) in the polarity reversal voltage determination unit 31B, the second comparator signal output unit 31D When the output of the signal N is started and the polarity inversion voltage L that shifts from the minus potential to the plus potential in the polarity inversion voltage determination unit 31B becomes equal to or higher than the plus side set voltage threshold (+4.7 V), the second comparator signal N The output will be terminated.

  The AND circuit 31E outputs a zero cross signal P under the AND condition when the output of the first comparator signal M of the first comparator signal output unit 31C and the output of the second comparator signal N of the second comparator signal output unit 31D are AND conditions. Will do. As a result, even if the voltage drop α occurs in the AC power supply voltage, unnecessary zero cross signal output can be prevented due to the influence of the voltage drop α.

  Further, the correction zero-cross signal output control unit 32 has a full-wave rectified voltage that shifts from a high potential to a low potential among the full-wave rectified voltages of the full-wave rectifier circuit 14 as described in the prior art. When the positive-side fixed voltage threshold is not reached, the output of the correction zero cross signal Q is started, and the full-wave rectified voltage that shifts from the low potential to the high potential among the full-wave rectified voltages is not less than the positive-side fixed voltage threshold. The output of the correction zero cross signal Q is terminated.

  Then, the triangular wave signal generation unit 17A in the phase control circuit 17 starts generating the triangular wave signal R according to the output end timing of the zero cross signal P, and the triangular wave signal according to the output start timing of the correction zero cross signal Q. By terminating the generation of R, even if a voltage drop α occurs in the AC power supply voltage J, an accurate triangular wave signal R is generated and output without being affected by the voltage drop α.

  As a result, the phase control unit 17B in the phase control circuit 17 outputs a phase control signal based on the triangular wave signal R generated by the triangular wave signal generation unit 17A and the temperature adjustment signal of the temperature regulator 4, and passes through the trigger circuit 18. A trigger signal corresponding to the phase control signal is output. The triac 19 supplies and outputs a desired load current to the load circuit 3 through the output terminal 13 in accordance with the trigger signal.

  According to the first embodiment, when the output voltage K of the transformer circuit 13 that shifts from the positive potential to the negative potential in the voltage determination unit 31A becomes equal to or lower than the negative side set voltage threshold (−0.1 V), the first comparator. When the output of the rate signal M is started and the output voltage K that shifts from the minus potential to the plus potential becomes equal to or higher than the plus side set voltage threshold (+4.7 V), the output of the first comparator signal M is terminated and the polarity voltage When the polarity reversal voltage L of the output voltage K, which shifts from the positive potential to the negative potential in the determination unit 31B, becomes equal to or lower than the negative side set voltage threshold (−0.1 V), the output of the second comparator signal N is started. When the polarity reversal voltage L that shifts from the negative potential to the positive potential becomes equal to or higher than the positive side set voltage threshold (+4.7 V), the output of the second comparator signal N is terminated, and the first comparator Since the zero cross signal P of the zero cross signal output control unit 31 is output under the AND condition of the output of the rate signal M and the output of the second comparator signal N, a voltage drop α is generated in the AC power supply voltage J. Even so, it is possible to ensure the normal phase control of the AC power supply voltage J by reliably preventing the output of an unnecessary zero cross signal while reliably preventing the occurrence of false firing at the time of commutation. Load current amount can be obtained.

  Further, according to the first embodiment, the generation of the triangular wave signal R is started according to the output end timing of the zero cross signal P of the zero cross signal output control unit 31, and the correction zero cross signal output control unit 32 Since the generation of the triangular wave signal R is terminated and the triangular wave signal R is generated and output in accordance with the output start timing of the correction zero cross signal Q, the timing at which the zero cross signal P is slightly delayed from the true zero cross timing. Even if it is generated by the above, the conventional zero cross signal based on the full wave rectified voltage, that is, the output start timing of the correction zero cross signal Q is used, so that the triangular wave signal R does not straddle the true zero cross timing. Therefore, it is possible to reliably prevent the occurrence of false ignition during commutation. As a result, even if the voltage drop α occurs in the AC power supply voltage J, the desired load current can be output while ensuring the normal phase control of the AC power supply voltage J without being affected by the voltage drop α. .

  In the first embodiment, the zero cross formed by the voltage determination unit 31A, the polarity inversion voltage determination unit 31B, the first comparator signal output unit 31C, the second comparator signal output unit 31D, and the AND circuit 31E. The signal output control unit 31 is used to output the zero cross signal P under the AND condition of the first comparator signal M and the second comparator signal N. The embodiment in this case will be described as a second embodiment.

(Embodiment 2)
FIG. 4 is a block diagram showing a schematic configuration inside the zero cross signal output circuit 16A and the phase control circuit 17 which are the main parts of the power adjustment apparatus 1 showing the second embodiment, and FIG. 5 shows the second embodiment. It is a timing chart which shows the processing operation until it produces | generates and outputs a zero cross signal from the alternating current power supply voltage of the electric power adjustment apparatus 1 shown. The same components as those of the power adjustment apparatus 1 shown in FIG.

  As shown in FIG. 5, the zero-cross signal output control unit 41 in the zero-cross signal output circuit 16A shown in FIG. 4 has a double-side output voltage that shifts from a negative potential to a positive potential among the both-side output voltages S of the transformer circuit 13. When S becomes equal to or higher than the first positive set voltage threshold near zero phase, the output of the positive potential zero cross signal T is started, and the second positive set voltage equal to or higher than the first positive set voltage threshold and near zero phase. When the threshold value is exceeded, the output of the positive potential side zero cross signal T is terminated, and among the both side output voltages S of the transformer circuit 13, the both side output voltage S that shifts from the positive potential to the negative potential is the first negative value near the zero phase. When the voltage becomes equal to or lower than the first set voltage threshold, the output of the negative potential side zero cross signal U is started, and the second negative set voltage threshold equal to or lower than the first negative set voltage threshold and near the zero phase. When the bottom, is to terminate the output of the negative potential side zero cross signal U.

  The zero cross signal output control unit 41 also outputs the first plus side set voltage threshold and the second plus side until the output of the next minus potential side zero cross signal U is finished after the output of the plus potential side zero cross signal T is finished. The voltage threshold determination operation of the set voltage threshold is prohibited, and after the output of the minus potential side zero cross signal U is finished, the first minus side set voltage threshold value and the second minus voltage side zero cross signal T are finished until the output of the next plus potential side zero cross signal T is finished. The voltage threshold determination operation of the minus side set voltage threshold is prohibited.

  The zero cross signal output control unit 41 outputs the negative potential side zero cross signal U by inverting the polarity and outputs the polarity inversion output and the positive potential side zero cross signal T as the zero cross signal V.

  The zero cross signal output control means described in the claims corresponds to the zero cross signal output control unit 41.

  Next, the operation of the power adjustment apparatus 1 according to the second embodiment will be described with reference to FIG.

  Assume that a voltage drop α occurs in the AC power supply voltage S from the AC power supply 2.

  The zero-cross signal output control unit 41, when the two-sided output voltage S that shifts from the minus potential to the plus potential among the both-side output voltages S of the transformer circuit 13 becomes equal to or higher than the first plus-side set voltage threshold, When the output of T is started and the both-side output voltage S becomes equal to or higher than the second positive side set voltage threshold, the output of the positive potential side zero cross signal T is ended.

  The zero cross signal output control unit 41 ends the output of the next negative potential side zero cross signal U after the output of the positive potential side zero cross signal T based on the both-side output voltage S that shifts from the negative potential to the positive potential. Until the voltage threshold determination operation of the first plus side set voltage threshold and the second plus side set voltage threshold is prohibited, that is, only the voltage threshold judgment operation of the first minus side set voltage threshold and the second minus side set voltage threshold is performed. Will be executed. As a result, even if the voltage drop α occurs in the AC power supply voltage S, unnecessary zero cross signal output can be prevented due to the influence of the voltage drop α.

  The zero cross signal output control unit 41 also sets the negative potential side zero when the both side output voltage S that shifts from the plus potential to the minus potential among the both side output voltages S of the transformer circuit 13 becomes equal to or less than the first minus side set voltage threshold. When the output of the cross signal U is started and the both-side output voltage S becomes equal to or lower than the second negative side set voltage threshold, the output of the negative potential side zero cross signal U is ended.

  The zero cross signal output control unit 41 ends the output of the next positive potential side zero cross signal T after the end of the output of the negative potential side zero cross signal U based on the both-side output voltage S that shifts from the positive potential to the negative potential. Until the first negative set voltage threshold and the second negative set voltage threshold are prohibited, that is, only the first positive set voltage threshold and the second positive set voltage threshold are determined. Will be executed. As a result, even if the voltage drop α occurs in the AC power supply voltage S, unnecessary zero cross signal output can be prevented due to the influence of the voltage drop α.

  Then, the zero cross signal output control unit 41 inverts the polarity of the negative potential side zero cross signal U so that the negative side zero cross signal U and the plus side zero cross signal T whose polarity is inverted correspond to the AC power supply voltage. The zero cross signal V is output.

  As a result, the triangular wave signal generation unit 17A of the phase control circuit 17 starts generating the triangular wave signal according to the output end timing of the zero cross signal V, and the correction zero cross signal output control unit 32 outputs the correction zero cross signal. The generation of the triangular wave signal is terminated according to the output start timing, and the triangular wave signal is generated. Then, the phase control unit 17B in the phase control circuit 17 outputs a phase control signal based on the triangular wave signal generated by the triangular wave signal generation unit 17A and the temperature adjustment signal of the temperature regulator 4, and performs phase control through the trigger circuit 18. A trigger signal corresponding to the signal is output. As a result, the triac 19 supplies and outputs a desired load current to the load circuit 3 through the output terminal 13 in accordance with the trigger signal.

  According to the second embodiment, when the both-side output voltage S of the transformer circuit 13 that shifts from the minus potential to the plus potential becomes equal to or higher than the first plus side set voltage threshold, the output of the plus potential side zero cross signal T is started. When the both-side output voltage S becomes equal to or greater than the second plus-side set voltage threshold, the output of the plus potential-side zero cross signal T is terminated and the both-side output voltage S that shifts from the plus potential to the minus potential is set to the first minus side setting. Output of the negative potential side zero cross signal U is started when the voltage threshold value is below the threshold value, and output of the negative potential side zero cross signal U is ended when the output voltage S on both sides becomes equal to or lower than the second negative side set voltage threshold value. The output of the potential side zero cross signal T and the polarity inversion output of the negative potential side zero cross signal U are output as the zero cross signal V, and the positive potential side zero cross signal T After the output is finished, the voltage threshold determination operation of the first plus side set voltage threshold and the second plus side set voltage threshold is prohibited until the output of the next minus potential side zero cross signal U is finished. Since the output of the first negative side set voltage threshold and the second negative side set voltage threshold is prohibited until the output of the next positive potential side zero cross signal T is finished, the AC power supply Even if the voltage drop α occurs in the voltage, the set voltage is maintained until the output of the next zero-cross signal V is finished after the output of the zero-cross signal V is finished, while reliably preventing the occurrence of false firing at the time of commutation. By reversing the polarity of the threshold, it is possible to reliably prevent unnecessary zero-cross signal output and to ensure normal phase control of the AC power supply voltage. As a result, a desired load current can be output.

  Furthermore, according to the second embodiment, the generation of the triangular wave signal is started in accordance with the output end timing of the zero cross signal V of the zero cross signal output control circuit 41, and the correction of the correction zero cross signal output control circuit 32 is started. Since the generation of the triangular wave signal is terminated and the triangular wave signal is generated in accordance with the output start timing of the zero cross signal Q, the zero cross signal V is generated at a timing slightly delayed from the true zero cross timing. However, by using the output start timing of the conventional zero cross signal based on the full-wave rectified voltage, that is, the correction zero cross signal Q, the triangular wave signal does not cross the true zero cross timing. It is possible to reliably prevent the occurrence of false firing. As a result, even if the voltage drop α occurs in the AC power supply voltage J, the desired load current can be output while ensuring the normal phase control of the AC power supply voltage J without being affected by the voltage drop α. .

  In the above embodiment, an example in which the triac 19 is used as a switching control element has been described, but it goes without saying that the same effect can be obtained even if a thyristor is used.

  According to the power adjustment device of the present invention, when the AC power supply voltage that shifts from the positive potential to the negative potential is less than or equal to the negative set voltage threshold value near the zero phase, the output of the zero cross signal is started. Among the polarity inversion voltages of the AC power supply voltage, when the polarity inversion voltage that shifts from a minus potential to a plus potential is equal to or greater than the plus side set voltage threshold value near the zero phase, the output of the zero cross signal is terminated, and When the polarity reversal voltage that shifts from a positive potential to a negative potential within the polarity reversal voltage falls below the negative side set voltage threshold, the output of the zero cross signal is started. Since the output of the zero cross signal is terminated when the AC power supply voltage that shifts to the potential is equal to or higher than the positive side set voltage threshold, Even if a voltage drop occurs in the AC power supply voltage, it is possible to prevent the occurrence of false firing at the time of commutation, and to prevent the output of unnecessary zero cross signals, and to control the normal phase of the AC power supply voltage. As a result, a desired load current amount can be obtained, which is useful for a power adjustment device in a temperature adjustment system that adjusts the temperature of a heater in a semiconductor manufacturing process, for example.

It is a block diagram which shows schematic structure inside the power adjustment device which shows the 1st Embodiment of this invention. It is a block diagram which shows schematic structure inside the zero cross signal output circuit and phase control circuit which are the principal parts of the power adjustment device which shows 1st Embodiment. It is a timing chart which shows the processing operation until it produces | generates a triangular wave signal from the alternating current power supply voltage inside the power adjustment device which shows 1st Embodiment. It is a block diagram which shows schematic structure inside the zero cross signal output circuit and phase control circuit which are the principal parts of the power adjusting device which shows 2nd Embodiment. It is a timing chart which shows the processing operation until it produces | generates a zero cross signal from the alternating current power supply voltage inside the power conditioner which shows 2nd Embodiment. It is a block diagram which shows schematic structure inside the conventional power conditioner. It is a timing chart which shows the processing operation until it outputs load current from the alternating current power supply voltage inside the conventional power conditioner. It is a timing chart which shows the processing operation until it outputs load current from the alternating current power supply voltage at the time of voltage drop occurrence in the conventional power conditioner.

Explanation of symbols

1 Power adjustment device 16 Zero cross signal output circuit (zero cross signal output means)
17 Phase control circuit (phase control means)
17A Triangular wave signal generator (triangular wave signal generator)
18 Trigger circuit (trigger signal output means)
19 Triac (switching control element)
31 Zero cross signal output control unit (zero cross signal output control means)
31A Voltage determination unit (voltage determination means)
31B Polarity reversal voltage determination unit (polarity reversal voltage determination means)
31C First comparator signal output unit (first comparator signal output means)
31D Second comparator signal output unit (second comparator signal output means)
31E AND circuit (zero cross signal output control means)
32. Correction zero cross signal output control section (correction zero cross signal output control means)
41 Zero cross signal output control unit (zero cross signal output control means)

Claims (7)

Zero cross signal output means for detecting a zero phase of the AC power supply voltage and outputting a zero cross signal; generating a triangular wave signal based on the zero cross signal; and based on the triangular wave signal and the command signal, the phase of the AC power supply voltage A phase control means for outputting a phase control signal for controlling the trigger, a trigger signal output means for outputting a trigger signal corresponding to the phase control signal, and a switching control for outputting a load current corresponding to the AC power supply voltage corresponding to the trigger signal A power adjustment device having an element,
The zero cross signal output means includes
Among the AC power supply voltages, when the AC power supply voltage that shifts from a positive potential to a negative potential is equal to or lower than the negative side set voltage threshold value near the zero phase, the output of the zero cross signal is started, and the polarity of the AC power supply voltage When the polarity inversion voltage that shifts from a minus potential to a plus potential among the inversion voltages is equal to or higher than the plus side set voltage threshold value near the zero phase, the output of the zero cross signal is terminated,
When the polarity reversal voltage that shifts from a positive potential to a negative potential within the polarity reversal voltage becomes equal to or lower than the negative side set voltage threshold, the output of the zero cross signal is started. An electric power adjustment apparatus comprising: zero cross signal output control means for ending output of the zero cross signal when the AC power supply voltage that shifts to a positive potential becomes equal to or higher than the positive side set voltage threshold value. The zero cross signal output control means includes
It is determined whether or not the AC power supply voltage that shifts from a positive potential to a negative potential within the AC power supply voltage is equal to or lower than a negative-side set voltage threshold value near the zero phase. Voltage determining means for determining whether or not the AC power supply voltage that shifts from a potential to a positive potential is greater than or equal to a positive set voltage threshold value near the zero phase;
It is determined whether or not the polarity reversal voltage that shifts from a negative potential to a positive potential among the polarity reversal voltages of the AC power supply voltage is greater than or equal to the positive-side set voltage threshold, and among the polarity reversal voltages, the plus Polarity reversal voltage determination means for determining whether or not the polarity reversal voltage that shifts from a potential to a negative potential is equal to or lower than the negative side set voltage threshold
When the AC power supply voltage that shifts from the plus potential to the minus potential by the voltage determination means becomes equal to or lower than the minus side set voltage threshold, the output of the first comparator signal is started, and the minus potential is shifted to the plus potential. A first comparator signal output means for terminating the output of the first comparator signal when the AC power supply voltage is equal to or greater than the positive set voltage threshold;
When the polarity inversion voltage that shifts from the minus potential to the plus potential by the polarity inversion voltage determining means becomes equal to or greater than the plus side set voltage threshold, the output of the second comparator signal is terminated, and the plus potential is changed to the minus potential. A second comparator signal output means for starting the output of the second comparator signal when the polarity reversal voltage to be transferred becomes equal to or lower than the negative side set voltage threshold;
2. The power adjustment apparatus according to claim 1, wherein the zero cross signal is output under an AND condition of an output of the first comparator signal and an output of the second comparator signal. The zero cross signal output means includes
When the full-wave rectified voltage that shifts from a high potential to a low potential out of the full-wave rectified voltage of the AC power supply voltage is equal to or less than the positive fixed voltage threshold value near the zero phase, the correction zero-cross signal is output. The correction zero-cross signal output that terminates the output of the correction zero-cross signal when the full-wave rectification voltage that shifts from a low potential to a high potential becomes equal to or greater than the positive fixed voltage threshold. Having control means,
The phase control means includes
A triangular wave signal generating means for generating the triangular wave signal based on the zero cross signal of the zero cross signal output control means and the correcting zero cross signal of the correcting zero cross signal output control means. Item 3. The power adjustment device according to Item 1 or 2. The triangular wave signal generating means includes
The generation of the triangular wave signal is started according to the output end timing of the zero cross signal, and the generation of the triangular wave signal is ended according to the output start timing of the correction zero cross signal. 3. The power adjustment device according to 3. Zero cross signal output means for detecting a zero phase of the AC power supply voltage and outputting a zero cross signal; generating a triangular wave signal based on the zero cross signal; and based on the triangular wave signal and the command signal, the phase of the AC power supply voltage A phase control means for outputting a phase control signal for controlling the trigger, a trigger signal output means for outputting a trigger signal corresponding to the phase control signal, and a switching control for outputting a load current corresponding to the AC power supply voltage corresponding to the trigger signal A power adjustment device having an element,
The zero cross signal output means includes
When the AC power supply voltage that shifts from a negative potential to a positive potential among the AC power supply voltages becomes greater than or equal to a first positive side set voltage threshold value near the zero phase, an output of a positive potential side zero cross signal is output as the zero cross signal. Start, when the first positive side set voltage threshold or higher and the second positive side set voltage threshold near the zero phase is exceeded, the output of the positive potential side zero cross signal is terminated,
When the AC power supply voltage that shifts from a positive potential to a negative potential among the AC power supply voltages is equal to or lower than a first negative set voltage threshold value near the zero phase, an output of a negative potential side zero cross signal is output as the zero cross signal. And zero cross signal output control means for ending the output of the negative potential side zero cross signal when the first negative side set voltage threshold value is less than or equal to the second negative side set voltage threshold value near the zero phase. And
This zero cross signal output control means
After the output of the positive potential side zero cross signal, the voltage threshold determination operation of the first positive side set voltage threshold and the second positive side set voltage threshold is prohibited until the output of the negative potential side zero cross signal is ended. After the output of the negative potential side zero cross signal, the voltage threshold value judgment operation of the first negative side set voltage threshold and the second negative side set voltage threshold is prohibited until the output of the positive potential side zero cross signal is ended. A power adjustment device characterized by that. The zero cross signal output means includes
When the full-wave rectified voltage that shifts from a high potential to a low potential out of the full-wave rectified voltage of the AC power supply voltage is equal to or less than the positive fixed voltage threshold value near the zero phase, the correction zero-cross signal is output. The correction zero-cross signal output that terminates the output of the correction zero-cross signal when the full-wave rectification voltage that shifts from a low potential to a high potential becomes equal to or greater than the positive fixed voltage threshold. Having control means,
The phase control means includes
A triangular wave signal generating means for generating the triangular wave signal based on the zero cross signal of the zero cross signal output control means and the correcting zero cross signal of the correcting zero cross signal output control means. Item 6. The power adjustment device according to Item 5. The triangular wave signal generating means includes
The generation of the triangular wave signal is started according to the output end timing of the zero cross signal, and the generation of the triangular wave signal is ended according to the output start timing of the correction zero cross signal. 6. The power adjustment device according to 6.

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