JP6074589B2 - Blower - Google Patents

Description

  The present invention relates to reduction of power consumption of a smoothing circuit without causing a three-phase unbalanced state in a blower used by connecting to any two wires of commercial three-phase alternating current such as factory equipment and commercial equipment.

  Conventionally, a blower used by connecting to any two wires of this type of commercial three-phase alternating current is a smoothing circuit that converts a single-phase alternating current extracted from the three-phase alternating current into a direct current voltage, and is connected to a smoothing capacitor. A method is known in which a charging current having a narrow angle is smoothed by a reactor and the conduction angle of the charging current is increased.

  Hereinafter, the blower will be described with reference to FIGS. 7, 8, and 9.

As shown in FIG. 7 (a), a blower 103 connected as a single phase to a single-phase AC power source 102 between any two wires of a commercial three-phase AC power source 101 used in factory facilities, commercial facilities, etc. As shown in FIG. 7B, the fan motor 106 is driven by the inverter 105 with the DC voltage V output from the smoothing circuit 104 that converts the AC voltage into the DC voltage. Here, full-wave rectification of the single-phase AC power supply 102 is performed by the diode bridge 107, and the charging current Ic charged in the smoothing capacitor 108 is generated by the reactor 109 connected between the single-phase AC voltage 102 and the diode bridge 107. It is smooth. The electrical relationship will be described with reference to the operation waveform example shown in FIG. 8. The case where the reactor 109 is not inserted is shown in FIG. 8A and is shown by a dotted line that is full-wave rectified by the diode bridge 107. A solid line represents the DC voltage V of the smoothing capacitor 108 that is charged and discharged according to the full-wave rectified voltage waveform E and the operation of the fan motor 106. The charging current Ic at this time is steeple, and the portion indicated by “a” has a voltage drop near the peak value of the sine wave of the single-phase AC voltage 102 due to the impedance of the wiring in the middle of the single-phase AC power supply 102. Shows a distorted state. On the other hand, the state of the smoothing circuit 104 in which the reactor 109 is inserted is shown in FIG. 8B. By inserting the reactor 109, the charging current I _CL to the smoothing capacitor 108 is widened and the peak value is also lowered. It becomes a shape, the conspicuous voltage drop of the single-phase AC power supply 102 is suppressed, the sine wave waveform is maintained, and the commercial three-phase AC power supply 101 is in a balanced state.

  In addition, some washing and drying machines that are not this type of blower but have a reactor in a smoothing circuit that converts single-phase alternating current to direct current voltage bypass the charging current that flows through the reactor at light loads (for example, patents) Reference 1).

  Hereinafter, it will be described with reference to FIG.

  As shown in the figure, a light load with a small power supply harmonic current flowing through the single-phase AC power supply 102 in a case where the power consumption of the load that satisfies the power supply harmonic current regulation (for example, IEC610003-2) is small without using the reactor 109 is small. When the current detection means 110 determines the state, the switching element 111 connected in parallel to the reactor 109 is turned on, so that the charging current flowing through the reactor 109 is diverted to the switching element 111 to cause the resistance of the reactor 109 The power loss consumed by the components is suppressed.

Japanese Patent No. 4847551

  In such a conventional blower used by connecting to a single-phase AC voltage between any two wires of commercial three-phase AC, it is inevitable that the waveform near the peak value of the sine wave of this single-phase AC voltage is disturbed. In addition, the inter-phase voltage of the commercial three-phase alternating current is disturbed. This can be a cause of malfunctions of equipment connected to the commercial three-phase AC system, for example, generation of abnormal noise from an industrial three-phase AC induction motor that directly inputs a three-phase voltage. Therefore, it has been required to operate without disturbing the waveform near the peak value of the sine wave of the single-phase AC voltage.

  In addition, when the conventional technology is applied to a blower that is used by connecting to any two wires of commercial three-phase alternating current, the reactor provided in the smoothing circuit is always connected when it is determined to be in a heavy load state. It will become the composition. Since the reactor is always connected, the waveform distortion near the peak value of the sine wave of the single-phase AC voltage is suppressed, the sine wave waveform is maintained, and the commercial three-phase AC is balanced. . However, current always flows through the reactor, and power is constantly consumed by the resistance component of the reactor, and there has been a problem that the recent demand for power saving has not been sufficiently met.

  SUMMARY OF THE INVENTION The present invention solves the above-described conventional problems, and an object thereof is to provide a blower having a simple configuration that achieves low power consumption while maintaining the balance of a commercial three-phase AC power supply.

  In order to achieve this object, the present invention converts a single-phase AC voltage connected to any two wires of commercial three-phase AC into a DC voltage using a full-wave rectifier bridge circuit and a smoothing capacitor. A smoothing circuit that includes a reactor for smoothing a charging current to the smoothing capacitor, and a switch element is connected in parallel to both ends of the reactor to detect a voltage zero-cross point of the single-phase AC voltage The electronic control device includes a detecting means for detecting, a frequency determining means for detecting the frequency of the single-phase AC voltage based on a signal of the detecting means, and a switch element driving means for opening or closing the switch element. In accordance with the frequency determined by the determining means, a reactor energization start phase with respect to the voltage zero cross point at which the switch element is opened, and the switch element A storage unit that pre-sets and stores a reactor energization stop phase for the voltage zero cross point that is closed, and based on the information in the storage unit, the switching element driving means for each half cycle of the single-phase AC voltage The switch element is opened or closed, and the reactor is energized during the reactor energization start phase and the reactor energization stop phase within a half cycle of the single-phase AC voltage. This achieves the intended purpose.

  Further, the instantaneous value of the DC voltage smoothed by the smoothing capacitor is detected, and the DC voltage is switched from the reduced state of the DC voltage due to the discharging state of the smoothing capacitor to the charged state from the full-wave rectified voltage by the diode bridge. A DC voltage detecting means for detecting a charging transition point that is in an increased state and a measuring means for measuring a charging transition phase from the charging transition point are provided in an electronic control device, and the voltage zero cross point of the single-phase AC voltage is The charge transition phase measured by the measuring means is compared with the reactor energization start phase, and if the charge transition phase is earlier than the reactor energization start phase, the switch element is opened at the reactor energization start phase, and this charge transition phase Is slower than the reactor energization start phase, the operation of closing the switch element is performed within a half cycle of the single-phase AC voltage. Is obtained by and performing the Oite the switching element driving unit, thereby it is to achieve the intended purpose.

  Further, the switch element having a parasitic diode in the opposite direction between the main electrode terminals of the switch element is characterized in that the intended purpose is achieved.

  According to the present invention, an air blower equipped with a smoothing circuit that is connected to any two wires of a commercial three-phase alternating current and converts a single-phase alternating current voltage into a direct current voltage using a full-wave rectifier bridge circuit and a smoothing capacitor. A detecting means for detecting a voltage zero cross point of the single-phase AC voltage, comprising a reactor for smoothing the charging current to the smoothing capacitor, and connecting a switching element in parallel to both ends of the reactor, and the detecting means The electronic control device is provided with a frequency determining means for detecting the frequency of the single-phase AC voltage based on the signal of the above and a switch element driving means for opening or closing the switch element, according to the frequency determined by the frequency determining means. A reactor energization start phase with respect to the voltage zero crossing point at which the switch element is opened, and the voltage zero crossing at which the switch element is closed. And a storage unit that pre-sets and stores the reactor energization stop phase for the point, and the switch element driving means opens or closes the switch element for each half cycle of the single-phase AC voltage based on information stored in the storage unit. By closing the reactor energization start phase and the reactor energization stop phase within a half cycle of the single-phase AC voltage, the switch drive means is configured to perform energization to the reactor. In each half cycle of the single-phase AC voltage, the reactor is energized according to the phase with respect to the voltage zero-cross point of the single-phase AC voltage to suppress waveform distortion near the preset peak value of the sine wave of the single-phase AC voltage. Since the reactor can be energized only during an effective period, it is possible to suppress unnecessary power consumption in the reactor even under heavy load conditions. It is possible to obtain.

The block diagram of the air blower of Embodiment 1 of this invention ((a) The figure connected to the commercial three-phase alternating current power supply, (b) The figure which shows the structure of an air blower) Same control block diagram Figure of the same operation waveform example The block diagram of the air blower of Embodiment 2 of this invention. Same control block diagram Diagram of the same operation waveform example ((a) Waveform at heavy load, (b) Waveform at light load) Block diagram of a conventional blower ((a) diagram showing connection to a commercial three-phase AC power source, (b) diagram showing the configuration of the blower) FIG. 7 is a diagram of a conventional operation waveform example ((a) when the reactor is not inserted, (b) a diagram showing a state of the smoothing circuit with the reactor inserted) Block diagram of another conventional blower

  A blower according to claim 1 of the present invention is a smoothing circuit that converts a single-phase AC voltage to a DC voltage using a full-wave rectifier bridge circuit and a smoothing capacitor, connected to any two wires of a commercial three-phase AC. A detecting device for detecting a voltage zero-cross point of the single-phase AC voltage by providing a reactor for smoothing a charging current to the smoothing capacitor, and connecting a switching element in parallel to both ends of the reactor. And a frequency judgment means for detecting the frequency of the single-phase AC voltage based on a signal from the detection means, and a switch element driving means for opening or closing the switch element. According to the determined frequency, the reactor energization start phase with respect to the voltage zero cross point at which the switch element is opened, and the switch element is closed. A storage unit that pre-sets and stores a reactor energization stop phase with respect to the recording zero cross point, and the switching element driving means is configured to switch the switching element for each half cycle of the single-phase AC voltage based on information stored in the storage unit. Is opened or closed, and the reactor is energized during the reactor energization start phase and the reactor energization stop phase within a half cycle of the single-phase AC voltage. As a result, the switch driving means performs energization to the reactor by the phase with respect to the voltage zero-cross point of the single-phase AC voltage every half cycle of the single-phase AC voltage, and sets the peak of the sine wave of the preset single-phase AC voltage. Since it is possible to energize the reactor only during a period in which the waveform distortion near the value is effective, unnecessary power consumption in the reactor is suppressed even under heavy load conditions. There is an effect of reducing the power consumption of the blower while maintaining the balance of the power source.

Further, the instantaneous value of the DC voltage smoothed by the smoothing capacitor is detected, and the DC voltage is switched from the reduced state of the DC voltage due to the discharging state of the smoothing capacitor to the charged state from the full-wave rectified voltage by the diode bridge. A DC voltage detecting means for detecting a charging transition point that is in an increased state and a measuring means for measuring a charging transition phase from the charging transition point are provided in an electronic control device, and the voltage zero cross point of the single-phase AC voltage is The charge transition phase measured by the measuring means is compared with the reactor energization start phase, and if the charge transition phase is earlier than the reactor energization start phase, the switch element is opened at the reactor energization start phase, and this charge transition phase Is slower than the reactor energization start phase, the operation of closing the switch element is performed within a half cycle of the single-phase AC voltage. It may be configured that performed by Oite the switching element driving means. As a result, the switch driving means performs energization to the reactor by the phase with respect to the voltage zero-cross point of the single-phase AC voltage every half cycle of the single-phase AC voltage, and sets the peak of the sine wave of the preset single-phase AC voltage. When the energization of the reactor is performed only during the period in which the waveform distortion near the value is suppressed, and the charge transition phase is later than the reactor energization start phase, the charging current of the smoothing capacitor is small and the load is low. Therefore, in a light load state that does not affect the waveform distortion in the vicinity of the peak value of the sine wave of the single-phase AC voltage, unnecessary power consumption in the reactor is suppressed by bypassing all the energization to the reactor to the switch element. As a result, the power consumption of the blower can be reduced while maintaining the balance of the commercial three-phase AC power supply.

Alternatively, a switch element having a parasitic diode in the reverse direction between the main power supply terminals may be used. As a result, since a circulation circuit of the parasitic diode and the reactor is naturally formed, the electrical energy accumulated in the reactor is safely discharged even when the wiring of the reactor is broken.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
As shown in FIG. 1 and FIG. 2, the blower 1 is connected to a single-phase AC voltage 102 between any two wires of a commercial three-phase AC power source 101 used for factory facilities, commercial facilities, and the like. The inside of the blower 1 includes a smoothing circuit 2 that converts an AC voltage into a DC voltage and outputs it, an inverter 105 that generates an arbitrary AC voltage, a fan motor 106 as a blower, and a voltage zero cross of a single-phase AC voltage 102. The electronic control device 4 is provided with an AC voltage zero cross detection means 3 for detecting a point.

  The smoothing circuit 2 includes a diode bridge 5 for full-wave rectifying the single-phase AC voltage 102, a smoothing capacitor 6 for smoothing the full-wave rectified full-wave rectified voltage E1 to a DC voltage V1, and a positive output side of the diode bridge 5. The current smoothing reactor 7 is connected to the smoothing capacitor 6.

  A collector terminal of a PNP bipolar transistor 8 is connected as a switching element to a terminal on the smoothing capacitor 6 side of the reactor 7, and an emitter terminal of the PNP bipolar transistor 8 is connected to the other terminal of the reactor 7. . The electronic control unit 4 includes a transistor driving means 9 that opens or closes, that is, turns on or off, the PNP-type bipolar transistor 8 connected in parallel to both ends of the reactor 7 as described above. Here, the negative potential of the smoothing circuit 2 is set to the GND potential 10 as the reference potential of the electronic control unit 4.

Further, as shown in FIG. 2, in addition to the AC voltage zero-cross detection means 3 and the transistor drive means 9, the electronic control unit 4 determines whether the commercial frequency of the single-phase AC voltage 102 is 50 Hz or 60 Hz. The determination means 11, the 1st timer means 12 which measures the phase which starts electricity supply to the reactor 7, and the 2nd timer means 13 which measures the phase which stops electricity supply to the reactor 7 are provided. In addition, the electronic control unit 4 includes a reactor energization start phase storage unit 14 in which a reactor energization start phase θ _on , which is a phase from a voltage zero crossing point at which energization of the reactor 7 is started, and an energization to the reactor 7. the also includes reactor energization stop phase memory 15 set in advance to store the reactor deenergization phase theta _off is the phase of stopping.

The AC voltage zero-cross detection means 3 generates a zero-cross interrupt signal S ₀ at the voltage zero-cross point of the single-phase AC voltage 102 and transmits it to the AC power frequency judgment means 11, the first timer means 12 and the second timer means 13. is there.

The AC power source frequency determination means 11 transmits the commercial frequency information S _f of the single-phase AC voltage 102 determined from the cycle of the zero cross interrupt signal S ₀ to the reactor energization start phase storage unit 14 and the reactor energization stop phase storage unit 15. It is.

Reactor energization start phase memory 14, the off time t _off the first timer means is a timing signal for turning off the PNP type bipolar transistor 8 as a preset stored reactor energization start phase theta _on based on the frequency information S _f 12 is transmitted.

The reactor energization stop phase storage unit 15 uses the second timer means to turn on time t _on which is a timing signal for turning on the PNP-type bipolar transistor 8 as the reactor energization stop phase θ _off that is preset and stored based on the frequency information S _f. 13 to be transmitted.

The first timer means 12 transmits a count up signal t _off-up for the voltage zero cross point to the transistor driving means 9 using the zero cross interrupt signal S ₀ and the off time t _off .

The second timer means 13 transmits a count up signal t _on-up for the voltage zero cross point to the transistor drive means 9 using the zero cross interrupt signal S ₀ and the on time t _on .

According to such a configuration, the AC power supply frequency determination means 11 determines whether the commercial frequency f of the single-phase AC voltage 102 is 50 Hz or 60 Hz from the cycle in which the zero-cross interrupt signal S ₀ is sent for each voltage zero-cross point. doing.

First timer means 12, start the timer counting operation by the zero-crossing interrupt signal S ₀ transmitted to the timer counts up and reaches the OFF time point t _off, which is transmitted from the reactor energization start phase memory 14. That is, the first timer unit 12 measures the reactor energization start phase θ _on with respect to the voltage zero cross point by the timer count up, and transmits the count up signal t _off-up to the transistor driving unit 9.

The second timer means 13, start the timer counting from zero cross interrupt signal S ₀ sent to the timer counts up and reaches the ON time t _on transmitted from the reactor energization stop phase memory 15. That is, the second timer means 13 measures the reactor energization stop phase θ _off with respect to the voltage zero cross point by the timer count up, and transmits the count up signal t _on-up to the transistor driving means 9.

When the count up signal t _off-up is transmitted to the transistor driving means 9, the PNP bipolar transistor 8 is turned off, and the reactor 7 is a smoothing capacitor in a smoothed state with a wide conduction angle at the reactor energization start phase θ _on. A charging current I _C1 to 6 flows. When the count up signal t _on-up is transmitted to the transistor driving means 9, the PNP bipolar transistor 8 is turned on, thereby bypassing the reactor 7 at the reactor energization stop phase θ _off , and the PNP bipolar transistor 8, the charging current I _C1 for the remaining period of the charging period to the smoothing capacitor 6 flows.

As described above, the charging current I _C1 to the smoothing capacitor 6 becomes a waveform that is sufficiently smoothed by the reactor 7 in the vicinity of the peak value of the sine wave of the single-phase AC voltage 102, and bypasses the reactor 7 after the off time t _off. It flows to the PNP type bipolar transistor 8.

At this time, since the electric energy accumulated in the reactor 7 is temporarily released even after the PNP bipolar transistor 8 is turned on, the charging current I _C1 flowing to the smoothing capacitor 6 is between the reactor 7 and the PNP bipolar in the meantime. This is a combined current of the current flowing through the transistor 8.

FIG. 3 shows an example of the above operation waveform. In the voltage waveform, what is indicated by a dotted line is a full-wave rectified waveform E1 obtained by full-wave rectifying the single-phase AC voltage 102 by the diode bridge 5, and is indicated by a solid line. What is the DC voltage V1 charged and discharged by the smoothing capacitor 6. Here, the A part is a voltage zero cross point of the full-wave rectified waveform E 1 and also a voltage zero cross point of the single-phase AC voltage 102. In the current waveform, the solid line indicates the charging current I _C1 flowing through the smoothing capacitor 6, and the broken line indicates the virtual charging current I ′ _L1 flowing through the reactor 7 when there is no PNP-type bipolar transistor 8.

As described above, from the intersection B portion of the charging current I _C1 and the virtual charging current I ′ _L1 that is the point at which the electric energy accumulated in the reactor 7 has been released to the point C portion where the virtual charging current I ′ _L1 ends. The period t _d is a period in which the current flowing through the reactor 7 due to the PNP bipolar transistor 8 being turned on is suppressed.

  In addition, since the parasitic diode 8a exists between the collector and the emitter of the PNP type bipolar transistor 8 as a switching element, even if the wiring to both ends of the reactor 7 is broken, the electric energy accumulated in the reactor 7 is lost. Discharge occurs in the circulation circuit of the reactor 7 and the parasitic diode 8a.

Further, the reactor 7 is inserted between the positive output side of the diode bridge 5 and the smoothing capacitor 6 to form the PNP bipolar transistor 8 as a switching element, so that the base current I _B toward the GND potential 10 of the smoothing circuit 2 is obtained. Can be turned on or off.

  As described above, the transistor drive means controls the energization timing of the reactor by the phase of the single-phase AC voltage with respect to the voltage zero cross point. Thereby, energization to the reactor is performed only during a period in which waveform distortion in the vicinity of the peak value of the sine wave of the single-phase AC voltage set in advance is effective within a half cycle of the single-phase AC voltage. it can. In this way, by passing a charging current to the smoothing capacitor through the reactor, a gradual current waveform having a wide conduction angle is prevented from generating a waveform distortion near the peak value of the sine wave of the single-phase AC voltage, while the period td is reached. The energization of the reactor can be stopped and the power consumption can be reduced. Therefore, it is possible to provide a blower that reduces power consumption while maintaining the balance of a commercial three-phase AC power supply.

  In addition, since a PNP bipolar transistor is used as the switching element, a circulation circuit of a parasitic diode and a reactor existing between the collector and the emitter of the PNP bipolar transistor is naturally formed. In the unlikely event that the wiring of the reactor is broken, it is possible to provide a blower having a simple circuit configuration that can safely discharge the electrical energy accumulated in the reactor.

  In addition, by inserting a reactor between the positive output side of the diode bridge and the smoothing capacitor and selecting a PNP bipolar transistor as the switching element, the PNP type can be realized with a simple circuit configuration using the GND potential of the smoothing circuit as a reference voltage. Bipolar transistors can be driven. Therefore, a blower having a simple circuit configuration can be provided.

  In the embodiment, the PNP type bipolar transistor is provided as the switching element. However, there is no difference in operational effect even when the P channel type MOS-FET is used.

(Embodiment 2)
In the present embodiment, an electronic control device 16 is provided for the electronic control device 4 of the first embodiment. In addition, about the same component as Embodiment 1, the detailed description is abbreviate | omitted using the same code | symbol.

  In the electronic control device 16, the AC voltage zero cross detection means 3 and the reactor energization start phase storage unit 14 of the electronic control device 4 are replaced with an AC voltage zero cross detection means 17 and a reactor energization start phase storage unit 18.

  As shown in FIGS. 4 and 5, the electronic control unit 16 detects the instantaneous value of the DC voltage V1 of the smoothing capacitor 6, and uses the diode bridge 5 based on the decrease state of the DC voltage V1 accompanying the discharge state of the smoothing capacitor 6. DC voltage detecting means 19 for detecting a charging transition point where the DC voltage V1 is increased by switching to the charged state from the full-wave rectified voltage E1 is connected in parallel between the terminals of the smoothing capacitor 6.

Further, the electronic control unit 16 includes a third timer unit 20 as a measuring unit that determines a charging transition phase θ _sh that is a phase of the charging transition point of the DC voltage V1, and a reactor energization start phase θ _{on of the} charging transition phase θ _sh. The off-time comparison means 21 for comparing the early / late relationship with respect to is newly provided.

The AC voltage zero-cross detection means 17 generates a zero-cross interrupt signal S ₀ at the voltage zero-cross point of the single-phase AC voltage 102, and the AC power frequency determination means 11, the first timer means 12, the second timer means 13, and the third timer means. 20 is transmitted.

The reactor energization start phase storage unit 18 sets an off time t _off which is a timing signal for turning off the PNP bipolar transistor 8 as the reactor energization start phase θ _on which is preset and stored based on the frequency information S _f. 21 is transmitted.

When the DC voltage detection means 19 determines a charging transition point at which the DC voltage V1 is increased from a decrease state, the DC voltage detection means 19 immediately transmits a charge transition signal S _sh to the third timer means 20.

The third timer means 20 transmits the count up signal t _sh as the charge transition phase θ _sh for the voltage zero cross point to the off-time comparison means 21 using the zero cross interrupt signal S ₀ and the charge transition signal S _sh .

The off time comparing means 21 compares the count up signal t _sh with the off time t _off and transmits the off time t _off to the first timer means 12 only when the count up signal t _sh ≦ the off time t _off is established. Is.

  Thereby, in the driving load fluctuation state in which the power consumption largely fluctuates depending on the operation state of the fan motor 106, the charging / discharging state of the smoothing capacitor 6 varies greatly depending on the driving load fluctuation state. FIG. 6 shows an example of the operating waveform that fluctuates.

FIG. 6A shows an example of an operation waveform in a state where the operation load state of the fan motor 106 is a heavy load state and the charging current I _C2 increases to the smoothing capacitor 6.

In the voltage waveform, the dotted line shows the full-wave rectified waveform E1 obtained by full-wave rectifying the single-phase AC voltage 102 with the diode bridge 5, and the solid line shows the DC voltage charged and discharged by the smoothing capacitor 6. V1 indicates a charge / discharge state. In the current waveform, the solid line indicates the charging current I _C2 flowing through the smoothing capacitor 6, and the broken line indicates the virtual charging current I ′ _L2 flowing through the reactor 7 when there is no PNP-type bipolar transistor 8. It is.

FIG. 6B shows an example of an operation waveform in a state where the operation load state of the fan motor 106 is a light load state and the charging current I _C3 to the smoothing capacitor 6 is reduced. In the voltage waveform, the dotted line shows the full-wave rectified waveform E1 obtained by full-wave rectifying the single-phase AC voltage 102 with the diode bridge 5, and the solid line shows the DC voltage charged and discharged by the smoothing capacitor 6. V1. In the current waveform, the solid line indicates the charging current I _C3 to the smoothing capacitor 6. Here, the A part is a voltage zero cross point of the full-wave rectified waveform E 1 and also a voltage zero cross point of the single-phase AC voltage 102.

  This will be described below using these operation waveform examples.

When the operation load state of the fan motor 106 is a heavy load state, the discharge of the DC voltage V1 of the smoothing capacitor 6 is accelerated. Therefore, as shown in FIG. It approaches the voltage zero cross point of the AC voltage 102 and is earlier than the reactor energization start phase θ _on .

Since the DC voltage detecting means 19 detects the instantaneous value of the DC voltage V1, it can detect the charging transition point where the DC voltage V1 changes from the discharging state to the charging state. A signal S _sh is transmitted to the third timer means 20.

The third timer means 20 starts the timer count operation from the sent zero cross interrupt signal S _0, receives the charge transition signal S _sh , counts up the timer, measures the charge transition phase θ _sh with respect to the voltage zero cross point, and counts The up signal t _sh is transmitted to the off time comparing means 21. Here, since the count up signal t _sh is earlier than the off time t _off of the reactor energization start phase storage unit 18, the count up signal t _sh ≦ off time t _off is established, and the off time comparison means 21 _off is transmitted to the first timer means 12.

The first timer means 12 starts the timer count operation from the sent zero-cross interrupt signal S ₀ , but does not reach the off time t _off and therefore does not count up the timer, and outputs the count up signal t _off-up to the transistor drive means. Do not send to 9.

Thus, since the transistor driving means 9 does not turn off the PNP bipolar transistor 8, the PNP bipolar transistor 8 continues to be turned on, and the charging current I _C2 to the smoothing capacitor 6 bypasses the reactor 7 to the PNP bipolar transistor 8. It will flow.

After a while, the first timer means 12 counts up the timer after the off time t _off has elapsed, and transmits a count up signal t _off-up to the transistor driving means 9, which is connected to the PNP bipolar device. The transistor 8 is turned off.

Then, the charging current I _C2 to the smoothing capacitor 6 starts to flow only to the reactor 7 in the reactor energization start phase θ _on , and the charging current I _C2 flowing due to the potential difference between the full-wave rectified waveform E1 and the DC voltage V1 is a single-phase AC. The waveform near the peak of the sine wave of voltage 102 flows in a smooth state with a wide conduction angle without distortion.

Soon after, the second timer means 13 starting the timer count operation from the transmitted zero-cross interrupt signal S ₀ counts up the timer when the on-time t _on is reached, and outputs the count up signal t _on-up to the transistor driving means 9. Send to.

Here, the transistor drive means 9 turns on the PNP bipolar transistor 8 in the reactor energization stop phase θ _off , bypasses the reactor 7, and charges the PNP bipolar transistor 8 with the charging current I for the remaining period of the charging period. _C2 will flow.

Even after the PNP-type bipolar transistor 8 is turned on, the electric energy stored in the reactor 7 is temporarily released, so that the charging current I _C2 flowing to the smoothing capacitor 6 is applied to the reactor 7 and the PNP-type bipolar transistor 8 during that time. It is a composite current of the flowing current.

On the other hand, as shown in FIG. 6B, when the operation load state of the fan motor 106 is a light load state, the discharge of the DC voltage V1 of the smoothing capacitor 6 is delayed, and the charge transition point at which the discharge changes to the charge state is It moves away from the voltage zero cross point of the single-phase AC voltage 102, and becomes later than the reactor energization start phase θ _on .

The third timer means 20 whose timer count operation has started from the zero-cross interrupt signal S ₀ receives the charge transition signal S _sh from the DC voltage detection means 19 and counts up the timer, and the charge transition that is the phase from the voltage zero-cross point. The phase θ _sh is measured, and the count up signal t _sh is transmitted to the off-time comparing means 21.

Here, since the count up signal t _sh is later than the off time t _off of the reactor energization start phase storage unit 18, the count up signal t _sh > the off time t _off , and the off time comparison unit 21 performs the off time t _off. Is not transmitted to the first timer means 12.

The first timer means 12 cannot perform the timer count up operation because the off time t _off does not come, and does not transmit the count up signal t _off-up to the transistor driving means 9.

That is, since the transistor drive means 9 does not operate even after the reactor energization start phase θ _on has passed, the PNP bipolar transistor 8 continues to be turned on, and the charging current I _C3 of the smoothing capacitor 6 bypasses the reactor 7. The current flows through the PNP bipolar transistor 8.

In addition, the second timer means 13 starting the timer count operation from the sent zero-cross interrupt signal S ₀ counts up the timer when the on-time t _on is reached, and measures the reactor energization stop phase θ _off with respect to the voltage zero-cross point. The count up signal t _on-up is transmitted to the transistor driving means 9.

Here, since the PNP bipolar transistor 8 is already turned _on , the transistor driving means 9 turns on the PNP bipolar transistor 8 by the count up signal t _on-up . Does not occur.

Thus, when the fan motor 106 is in a light load state, the charging current I _C3 to the smoothing capacitor 6 continues to flow to the PNP bipolar transistor 8 while always bypassing the reactor 7. The current I _C3 does not always flow.

As described above, in the heavy load state of the fan motor 106, the point D of the count up signal t _{sh from which} the virtual charging current I ′ _L2 before the off time t _off flows, the period t _d1 of the off time t _off , and the on time t _The point F part where the virtual charging current I ′ _L2 finishes flowing from the intersection E part of the charging current I _C1 and the virtual charging current I ′ _L2 that is the point where the electric energy accumulated in the reactor 7 has been released as described above after the _on. The period t _d2 until is a period in which the charging current I _C2 to the smoothing capacitor 6 flowing through the reactor 7 is suppressed. As a result, in the electronic control unit 16, the transistor driving means 9 operates the PNP bipolar transistor 8, and the energization timing to the reactor 7 is controlled by the phase of the single-phase AC voltage 102 with respect to the voltage zero cross point.

In this way, the reactor can be energized only during a period during which the waveform distortion near the peak value of the sine wave of the preset single-phase AC voltage is suppressed within the half cycle of the single-phase AC voltage. In this way, by passing a charging current to the smoothing capacitor through the reactor, a waveform having a wide conduction angle and a gradual current waveform having a wide conduction angle is prevented from being generated in the vicinity of the peak value of the sine wave of the single-phase AC voltage. _d1 and during said period of time t _d2, stopping the power supply to the reactor, it is possible to reduce power consumption. Therefore, it is possible to provide a blower that reduces power consumption while maintaining the balance of a commercial three-phase AC power supply.

In the light load state of the fan motor 106, the PNP bipolar transistor 8 can be immediately turned on by the DC voltage detection means 19 within a half cycle of the single-phase AC voltage, and the charging current I _C3 to the smoothing capacitor 6 is Therefore, it always flows through the PNP bipolar transistor 8 bypassing the reactor 7. That is, in the light load state where the power consumption of the load that satisfies the power supply harmonic current regulation (for example, IEC610003-2) is small without using the reactor, the reactor does not cause waveform distortion near the sine wave peak value of the single-phase AC voltage. The power loss consumed by the resistance component can be suppressed. Therefore, it is possible to provide a blower that reduces power consumption while maintaining the balance of a commercial three-phase AC power supply.

  Since the PNP bipolar transistor 8 is used as the switching element, a circulation circuit of the parasitic diode 8a existing between the collector and the emitter of the PNP bipolar transistor 8 and the reactor 7 is naturally formed. In the unlikely event that the wiring to both ends of the reactor is broken, it is possible to provide a blower having a simple circuit configuration that can safely discharge the electric energy accumulated in the reactor.

Further, the reactor 7 is inserted between the positive output side of the diode bridge 5 and the smoothing capacitor 6 to form the PNP bipolar transistor 8 as a switching element, so that the base current I _B toward the GND potential 10 of the smoothing circuit 2 is obtained. To turn on or off the PNP bipolar transistor 8. The PNP bipolar transistor can be driven with a simple circuit configuration using the GND potential of the smoothing circuit as a reference voltage. Therefore, a blower having a simple circuit configuration can be provided.

  In the embodiment, the PNP type bipolar transistor is provided as the switching element. However, there is no difference in operational effect even when the P channel type MOS-FET is used.

A blower according to the present invention is provided with a smoothing circuit that converts a single-phase AC voltage to a DC voltage using a full-wave rectifier bridge circuit and a smoothing capacitor, connected to any two wires of a commercial three-phase AC. Comprising a reactor for smoothing the charging current to the smoothing capacitor,
Detection means for detecting a voltage zero cross point of the single-phase AC voltage by connecting switching elements in parallel to both ends of the reactor, and frequency determination means for detecting the frequency of the single-phase AC voltage based on a signal of the detection means And a switching element driving means for opening or closing the switching element in the electronic control device, and a reactor energization start phase for the voltage zero cross point at which the switching element is opened according to the frequency determined by the frequency determination means And a storage unit that pre-sets and stores the reactor energization stop phase with respect to the voltage zero cross point that closes the switch element, and based on the information of the storage unit, for each half cycle of the single-phase AC voltage, The reactor within the half cycle of the single-phase AC voltage when the switch element driving means opens or closes the switch element. The switch driving means is configured to energize the reactor every half cycle of the single-phase AC voltage by energizing the reactor between the power start phase and the reactor energization stop phase. The reactor is energized only during a period that has an effect of suppressing waveform distortion in the vicinity of the peak value of the sine wave of the single-phase AC voltage that is set in advance according to the phase of the single-phase AC voltage with respect to the voltage zero-cross point. Since it is possible to suppress unnecessary power consumption in the reactor even under heavy load conditions, it is possible to reduce the power consumption of the blower while maintaining the balance of the commercial three-phase AC power supply. A machine with a smoothing circuit that converts the AC voltage of a single-phase AC power supply device connected to any two wires of commercial three-phase AC power supply such as facilities and commercial facilities into DC voltage and outputs it , For example, it is useful as an air conditioner or a switching power supply or the like.

DESCRIPTION OF SYMBOLS 1 Blower 2 Smoothing circuit 3 AC voltage zero cross detection means 4 Electronic controller 5 Diode bridge 6 Smoothing capacitor 7 Reactor 8 PNP type bipolar transistor 8a Parasitic diode 9 Transistor drive means 10 GND potential 11 AC power supply frequency judgment means 12 First timer means 13 Second timer means 14 Reactor energization start phase storage section 15 Reactor energization stop phase storage section 16 Electronic controller 17 AC voltage zero cross detection means 18 Reactor energization start phase storage section 19 DC voltage detection means 20 Third timer means 21 Off time comparison means DESCRIPTION OF SYMBOLS 101 Commercial three-phase alternating current power supply 102 Single phase alternating current voltage 103 Blower 104 Smoothing circuit 105 Inverter 106 Fan motor 107 Diode bridge 108 Smoothing capacitor 109 Reactor 110 Current detection means 111 Switch element

Claims (3)

Connected to any two wires of commercial three-phase AC,
A blower device including a smoothing circuit that converts a single-phase AC voltage into a DC voltage using a full-wave rectifier bridge circuit and a smoothing capacitor,
A reactor for smoothing the charging current to the smoothing capacitor;
A switch element is connected in parallel to both ends of the reactor,
Detection means for detecting a voltage zero-cross point of the single-phase AC voltage, frequency determination means for detecting the frequency of the single-phase AC voltage based on a signal of the detection means, and switch element driving means for opening or closing the switch element Equipped with an electronic control unit,
A reactor energization start phase for the voltage zero cross point at which the switch element is opened and a reactor energization stop phase for the voltage zero cross point at which the switch element is closed are set in advance according to the frequency determined by the frequency determining means. A storage unit that has been stored,
Based on the information in the storage unit, for each half cycle of the single-phase AC voltage, the switch element driving means opens or closes the switch element, and the reactor energization start phase within the half cycle of the single-phase AC voltage A blower characterized by energizing a reactor during a reactor energization stop phase. An instantaneous value of the DC voltage smoothed by the smoothing capacitor is detected, and the DC voltage increasing state is switched from the reduced state of the DC voltage accompanying the discharging state of the smoothing capacitor to the charging state from the full-wave rectified voltage by the diode bridge. The electronic control device comprises a DC voltage detection means for detecting a charging transition point and a measuring means for measuring a charging transition phase from the charging transition point,
The charging transition phase measured by the measuring means with respect to the voltage zero-cross point of the single-phase AC voltage is compared with the reactor energization start phase. If this charging transition phase is earlier than the reactor energization start phase, the reactor energization start is started. The switch element driving means performs an operation of opening the switch element at a phase and closing the switch element if the charge transition phase is later than the reactor energization start phase within a half cycle of the single-phase AC voltage. The blower according to claim 1. The blower according to claim 1 or 2, wherein the switch element has a parasitic diode in a reverse direction between the main electrode terminals of the switch element.

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