JP2011097822A - Pwm cyclo (r) converter device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the following problems of a PWM cyclo (R) converter device to be used for a lift or the like: when a storage battery is used as an emergency power source, a large regenerative power generated by a motor cannot be received completely, and a charging circuit is required when a large-capacity capacitor is used. <P>SOLUTION: In an emergency, an electric accumulator (8) is connected between a pair of lines of three lines constituting an input three-phase line, and a capacitor (9) for power regeneration is connected between another pair of lines of the three lines, so that a bidirectional switch module (7) performs PWM control in such a way that the electric accumulator (8) is connected with the motor (3) during powering, and the bidirectional switch module (7) performs PWM control in such a way that the capacitor (9) for power regeneration is connected with the motor (3) during power regeneration, to receive the regenerative power produced during regenerative operation of the motor (3) by the capacitor (9) for power regeneration. In addition, the capacitor (9) for power regeneration is charged by the electric accumulator (8). <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a PWM cycloconverter device that directly connects each phase of a power supply and each phase on the output side with a bidirectional switch having a self-extinguishing capability, and performs PWM control of an AC output voltage in accordance with an output voltage command.

  In a PWM cycloconverter device applied to a conventional elevator system or the like, the operation is switched to an emergency power supply in order to continue operation even when an abnormality such as a phase failure, power failure, or power imbalance occurs in the power supply. There is something.

A conventional elevator system using a PWM cycloconverter device is connected to a three-phase AC power supply, and is composed of a drive device for the elevator, a motor, and an elevator machine. Further, a storage battery or a large-capacity capacitor or an emergency A single-phase AC power supply or a three-phase AC power supply device is provided as an AC power supply for use.
The elevator drive device includes a power switch, a power failure detection circuit, an input power phase detection circuit, an emergency power phase detection circuit, a fixed phase information generation circuit, a phase detection circuit switch setting device, a phase detection circuit switch, and The PWM cycloconverter device includes an input filter, an input power supply level detection circuit, a control controller, a gate driver, and a bidirectional switch module.
With the above configuration, the PWM cycloconverter device applied to the conventional elevator system receives power from various types of emergency power supplies without changing the main circuit configuration when the three-phase AC power supply fails. Emergency operation was possible. (For example, refer to Patent Document 1.)

JP 2001-294378 A (page 5-6, FIG. 1)

In a PWM cycloconverter device applied to a conventional elevator drive device or the like, the PWM cycloconverter device can perform a power regeneration operation.For example, when a large regenerative power is generated from the motor such as when the elevator car is descending, The power is regenerated to the power source.
When a storage battery is used as an emergency DC power supply, the power is directly regenerated in the storage battery, so the storage battery may not be able to absorb all the regenerative power.
When a large-capacity capacitor is used as an emergency DC power supply, it is possible to absorb all regenerative power by appropriately selecting the capacitor capacity, but a separate capacitor charging circuit is required.
Therefore, the present invention has been made in view of such problems, and even if large regenerative power is generated during regenerative operation, it can be absorbed, and an emergency DC power supply that does not require a special charging circuit An object of the present invention is to provide a PWM cycloconverter device using the above.

  In order to achieve the above object, a PWM cycloconverter device according to one aspect of the present invention has an input side connected to a three-wire power source, an output side connected to a three-phase motor, and connects the three-wire power source and the three-phase motor. A bidirectional switch module consisting of nine bidirectional switches, an input power supply level detection circuit that detects the voltage value input from the three-wire power supply and outputs the input voltage value, and detects the phase of the three-wire power supply and input power supply An input power supply phase detection circuit that outputs a phase, a fixed phase information generation circuit that generates and outputs a plurality of fixed phase information, and selects any one of a plurality of fixed phase information according to a control switching signal, and an emergency A phase detection circuit that switches between the input power supply phase and the selected fixed phase information and inputs either to the control controller according to the power supply switching signal. Comprises a changeover switch, wherein in response to emergency power switching signal, the controller for generating and outputting an on-off signal of the bidirectional switch module while switching PWM method.

  In the PWM cycloconverter device according to the above aspect, the control controller preferably has a three-phase alternating current input three based on the input voltage value and the input power supply phase which are the outputs of the input power supply level detection circuit in response to the emergency power supply switching signal. ON / OFF signal is generated by the PWM method of the phase AC output, or is turned ON / OFF by the PWM method of the DC input three-phase AC output based on either the input voltage value and the first fixed phase information or the second fixed phase information. Switch whether to generate a signal.

  In the PWM cycloconverter device according to the above aspect, the output current detection circuit for detecting the output current of the bidirectional switch module, the output voltage command output by the controller, and the output current detection output by the output current detection circuit A power running regeneration determination circuit that generates a power running regeneration determination signal based on the value, the control switching signal is a power running regeneration determination signal, and the fixed phase information generation circuit, when the power running regeneration determination signal determines the power running state, When the first fixed phase information representing one line of the three-wire power supply is selected and the power running regeneration determination signal determines the regeneration state, the second fixed phase information representing the other one line between the three-wire power supply Select.

  In the PWM cycloconverter device according to the one aspect described above, preferably, the three-wire power source is a three-phase AC power source, and both terminals of the storage battery are connected between one of the three wires, and between the other one wire. Equipped with a three-wire DC power supply that connects both terminals of the regenerative capacitor, and a power switcher that switches between a three-phase AC power supply and a three-wire DC power supply. The controller outputs an emergency power switch signal to the power switcher. In response to the emergency power switching signal, the power switcher switches between the three-phase AC power source and the three-wire DC power source, and in response to the emergency power switching signal, the three-phase AC power input three-phase is input. Whether the on / off signal is generated by the AC output PWM method or the on / off signal is generated by the DC input three-phase AC output PWM method that uses the voltage of the three-wire DC power supply as input. In other words, the first fixed phase information is phase information representing the line between the two terminals of the storage battery, and the second fixed phase information is phase information representing the line between the two terminals of the regenerative capacitor. is there.

  In the PWM cycloconverter device according to the one aspect described above, preferably, the PWM cycloconverter device includes a power supply abnormality detection circuit that detects abnormality of the three-phase AC power supply and outputs a power supply abnormality detection signal, and the emergency power supply switching signal is a power supply abnormality detection signal, When a power supply abnormality signal is not output, the power supply switcher switches to a three-phase AC power supply. When a power supply abnormality detection signal is output, the power supply switcher switches to a three-wire DC power supply. When the signal is not output, an on / off signal is generated by the PWM method of the three-phase AC input and three-phase AC output using the voltage of the three-phase AC power supply as input. When the abnormality detection signal is not output, the three-wire DC power supply An on / off signal is generated by a PWM method of a DC input three-phase AC output using a voltage as an input.

  In the PWM cycloconverter device according to the one aspect described above, preferably, when charging the regenerative capacitor, the control controller connects three sets of three input phases and one output phase in the bidirectional switch module. A bidirectional switch set consisting of three bidirectional switches, all bidirectional switch sets turning off the bidirectional switch connected to the input phase connected to the common connection point of the storage battery and the regenerative capacitor, and at least one of both The two bidirectional switches connected to the other two input phases are turned on together in the bidirectional switch set.

  According to the PWM cycloconverter device of the present invention, the storage battery and the capacitor connected to the other phase other than the phase to which the storage battery is connected are used as the emergency power source, and the bidirectional switch of the PWM cycloconverter device is powered. By turning on so that the storage battery and motor are connected during operation, and by connecting the capacitor and motor during regenerative operation, the capacitor absorbs the regenerative power during motor regenerative operation, and the capacitor charging circuit It becomes possible to make it unnecessary.

Elevator drive device system block diagram of the present invention Circuit connection diagram of matrix converter when emergency power supply of the present invention is connected Regenerative capacitor 9 charging operation Bidirectional switch connection of matrix converter during power running Bidirectional switch connection of matrix converter during regenerative operation

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

  FIG. 1 is a circuit configuration diagram showing an embodiment of the present invention. The present invention relates to a conventional PWM cycloconverter applied to a system using a storage battery as an emergency power source in a drive system that drives a load that generates regenerative power such as an elevator, an output current detection circuit 16 and a power running regeneration discrimination circuit. 17 is added, the negative terminal of the regenerative capacitor is connected to the negative terminal of the storage battery, and the positive terminal is connected to the remaining one phase of the input three phases where the storage battery is not connected.

1, a PWM cycloconverter device 2 according to the present invention includes an input filter 6, an input power supply level detection circuit 10, a power supply abnormality detection circuit 11, a controller 13, an input power supply phase detection circuit 14, a fixed phase information generation circuit 15, an output current. The detection circuit 16, the power running regeneration determination circuit 17, the phase detection circuit changeover switch 18, and the bidirectional switch module 7 are configured. Also, the input side of the PWM cycloconverter device 2 is connected to a power switch 5, a three-phase AC power source 1, a regenerative capacitor 9 and a storage battery 8 connected in series. A motor 3 is connected to the output side of the PW dice converter device 2, and the motor 3 drives a load device 4 that generates regenerative power, such as an elevator machine.

The three-phase AC power source 1 is connected to a bidirectional switch module 7 via a power switch 5 and an input filter 6. The bidirectional switch module 7 connects nine combinations between the three-phase voltage (R, S, T) of the three-phase AC power source 1 input via the input filter 6 and the three-phase output voltage. It consists of a bidirectional switch. The output of the bidirectional switch module 7 is connected to each phase of the motor 3. Here, the input filter 6 is provided in order to attenuate the high-frequency component accompanying switching of the bidirectional switch module and prevent it from flowing out to the three-phase AC power source 1. Examples of bidirectional switches include two reverse voltage blocking IGBTs connected in anti-parallel, two anti-parallel connections of IGBT and diode, and series connection in which IGBT collectors or emitters are connected. Or two or more serially connected bodies in which IGBTs and diodes are connected in series with each other in the forward direction, but are not limited thereto.

The input power supply level detection circuit 10 detects the voltage value of each phase of the three-phase voltage input to the input filter 6. The input power supply phase detection circuit 14 detects a two-phase voltage among the three-phase voltages of the three-phase AC power supply 1, inputs the detected voltage value to, for example, a PLL, and the phase of the three-phase voltage of the three-phase AC power supply 1. Is determined as the input power supply phase. The fixed phase information generation circuit 15 is set in advance as to which phase of the input three phases the storage battery 8 and the regenerative capacitor 9 that are emergency power supplies are connected to. This set phase will be described later. When the storage battery 8 and the regenerative dendener 9 are used as power sources, the phase to which the storage battery 8 is connected or the phase to which the regenerative capacitor 9 is connected is determined according to the power running regeneration determination signal output from the power running regeneration determination circuit 17. Information is output to the phase detection circuit selector switch 18. As an example of the operation of the circuit power supply abnormality detection circuit 11, the voltage of the three-phase AC power supply 1 is detected, the detected voltage value is converted into a two-phase voltage by three-phase two-phase conversion, and the amplitude of the voltage is calculated from the two-phase voltage. In addition, the detected voltage value is further input to the PLL to obtain the frequency. A power failure occurs when the voltage amplitude thus obtained is smaller than the preset voltage value, a phase loss occurs when the fluctuation rate of the voltage amplitude is greater than or equal to the preset value, and the difference between the obtained frequency and the preset rated frequency. There is an example of detecting an abnormality of the three-phase AC power supply 1 by setting the power supply frequency abnormality when the value is equal to or greater than a preset value, but detecting an abnormality of the power supply that interferes with the operation of the PWM cycloconverter device. If so, it is not limited to this example. When the detected power supply abnormality occurs, the power supply abnormality detection circuit 11 outputs a power supply abnormality detection signal to the power supply switch 5 and the phase detection circuit switch 18. In addition, it is selected whether to use an emergency power supply with a separate operating tool, etc., and an operation signal indicating the selection result is input to the PWM cycloconverter device by an input / output device or IO device, and a power supply abnormality detection signal and logic A signal indicating that an emergency power supply is required may be used as an emergency power supply switching signal instead of the power supply abnormality detection signal, for example, a summed signal may be used instead of the power supply abnormality detection signal. In the above description, the value set in advance is set by a numerical value setter or the like (not shown), and the PWM cycloconverter device is configured by connecting the numerical value setter or the like to the PWM cycloconverter device 2 via a communication line or the like (not shown). 2 makes it possible to use the set value.

The control controller 13 takes in setting values such as the speed for the motor 3 set by a setting device (not shown) or a setting operation tool through an IO device or communication device (not shown), and based on these setting values, a known value is obtained. A voltage command for the motor 3 is generated by a vector control law or a V / F control law. Further, the controller 13 uses the PWM method of the PWM cycloconverter to determine the voltage based on the voltage value of each phase input from the power supply level detection circuit 10 and the phase input from the input power supply phase detection circuit 14 or the fixed phase information 15. A gate signal for driving each bidirectional switch of the bidirectional switch module 7 is output from the command to the gate driver 12. Details of the operation for generating the gate signal will be described later. The gate drive 12 drives each bidirectional switch of the bidirectional switch module 7 based on the gate signal input from the controller 13.

The power switch 5 outputs the three-phase output (R, S, T) from the three-phase AC power source 1 to the bidirectional switch module 7 through the input filter 6 as it is when no power failure detection signal is input. When the power supply abnormality detection signal is input, the voltage of the storage battery 8 and the regenerative capacitor 9 is switched from the voltage of the three-phase AC power supply where the abnormality has occurred and is input to the bidirectional switch module via the input filter 6. .
The phase detection circuit selector switch 18 selects and outputs the phase information from the input power supply phase detection circuit 14 to the controller 13 when the power supply abnormality detection signal is not input, and the power supply abnormality detection signal is input. In this case, the fixed phase information that is output from the fixed phase information generation circuit 15 is selected and output to the controller 13.

Based on the input voltage value output from the input power supply level detection circuit 10 and the input power supply phase output from the phase detection circuit changeover switch 18, the controller 13 controls the gate of each bidirectional switch of the bidirectional switch module 7. When the signal is turned on and off, and the power supply abnormality detection signal is not input, the gate signal of the bidirectional switch module 7 is generated so that the bidirectional switch module 7 performs the three-phase AC input three-phase AC output operation. When the power supply abnormality detection signal is input, the bidirectional switch module according to the input voltage value output from the input power supply level detection circuit 10 and the fixed phase information output from the phase detection circuit changeover switch 18 Generates a gate signal for the bidirectional switch module 7 so that 7 performs a DC input three-phase AC output operation.Generation of the gate signal of the bidirectional switch module 7 when the power supply abnormality detection signal is not input is performed by various known PWM methods of a known three-phase AC input three-phase AC output PWM cycloconverter.

The PWM method of this three-phase AC input three-phase AC output is selected from the three line voltages with the line voltage having the maximum amplitude at that phase from the input power supply phase detected as an example. A bidirectional switch that outputs a line voltage is selected, and an on / off signal is determined for the bidirectional switch. Then, the actual value of the selected line voltage is calculated by subtracting the two phase voltages from the input voltage value output from the input power supply level detection circuit 10, and the voltage command at that time relative to the value of the line voltage is calculated. The time ratio for outputting the output voltage is obtained in one cycle of the PWM control in proportion to the ratio. The time (pulse width) for which the selected bidirectional switch is turned on in one PWM control cycle is determined by multiplying the time of one PWM control cycle by the time ratio. In another example, in order to improve the input current waveform, a line voltage other than the line voltage having the maximum amplitude in one cycle of PWM control is output, and two or more different voltages are output in one cycle of PWM control. A PWM method for time-division output and a circuit in which a PWM converter and an inverter are connected by a DC circuit are virtually provided, and an on / off signal for the PWM converter and the inverter is created from the input power supply phase and voltage command, and the corresponding PWM Although there is a PWM method for turning on and off the bidirectional switch of the cycloconverter, the present invention may be this PWM method.

  Next, the operation of the present invention when a power supply abnormality detection signal is input and connected to an emergency power supply will be described. FIG. 2 shows an example of the circuit configuration of the PWM cycloconverter when the emergency power supply of the present invention is connected. SRU, SSU, STU, SRV, SSV, STV, SRW, SSW, STW are bidirectional switches. There are nine bidirectional switches on the module. When connected to the emergency power supply, the bidirectional switch module 7 supplies power running power from the storage battery 8 to the motor 3 when performing power running operation, and regenerates from the motor 3 to the regeneration capacitor 9 when performing regenerative operation. Accumulate power.

When an emergency power supply is connected as shown in FIG. 2, the regenerative capacitor 9 may not accumulate electric charges, such as before starting operation. At this time, the voltage of the regenerative capacitor 9 is 0V, and the input power level The S-phase and T-phase voltages detected by the detection circuit 10 are also 0V. In this case, a means for charging the regeneration capacitor 9 is required. When charging the regenerative capacitor 9, the controller 13 outputs a gate signal to the gate driver 12 so that the bidirectional switch of the bidirectional switch module 7 is in one of the following seven switching states.
(1) SRU: ON, SSU: OFF, STU: ON, SRV: OFF, SSV: OFF, STV: OFF, SRW: OFF,
SSW: OFF, STW: OFF
(2) SRU: OFF, SSU: OFF, STU: OFF, SRV: ON, SSV: OFF, STV: ON, SRW: OFF,
SSW: OFF, STW: OFF
(3) SRU: Off, SSU: OFF, STU: OFF, SRV: OFF, SSV: OFF, STV: OFF, SRW: ON,
SSW: OFF, STW: ON
(4) SRU: ON, SSU: OFF, STU: ON, SRV: ON, SSV: OFF, STV: ON, SRW: OFF,
SSW: OFF, STW: OFF
(5) SRU: OFF, SSU: OFF, STU: OFF, SRV: ON, SSV: OFF, STV: ON, SRW: ON,
SSW: OFF, STW: ON
(6) SRU: ON, SSU: OFF, STU: ON, SRV: OFF, SSV: OFF, STV: OFF, SRW: ON,
SSW: OFF, STW: ON
(7) SRU: ON, SSU: OFF, STU: ON, SRV: ON, SSV: OFF, STV: ON, SRW: ON,
SSW: OFF, STW: ON
These seven switching states equivalently create the circuit shown in FIG. 3, which is a charging circuit in which a storage battery and a capacitor are connected in parallel and the capacitor 9 is charged with the polarity shown in FIG. Compared with the connection diagram of the nine bidirectional switches shown in FIG. 2, the circuit by the switches SR, SS, ST of FIG. 3 actually has three three phases that connect each phase of the input three phases and one phase of the output. It can be seen that three sets of circuits are connected in parallel by bidirectional switch groups (SRU, SSU, STU), (SRV, SSV, STV), and (SRW, SSW, STW). The seven switching states shown in the equivalent circuit shown in FIG. 3 open at least one switch connected to the input phase connected to the common connection point of the storage battery 8 and the capacitor 9 in all three bidirectional switch sets. The two bidirectional switches connected to the input phase other than the input phase connected to the common connection point by one bidirectional switch set are both closed. With these switching states, the voltage of the storage battery 8 is applied to the regenerative capacitor 9, and the regenerative capacitor 9 is charged with the polarity shown in FIG. The number of bidirectional switches to close two bidirectional switches is determined so that the charging current of the regenerative capacitor takes into account the current rating of the bidirectional switch so that no current exceeding the current rating flows in the bidirectional switch. do it. In the switching states (1) to (7), for example, all of the bidirectional switch sets are opened as in (SRV, SSV, STV) and (SRW, SSW, STW) in (1). Some include a bidirectional switch set. Of the bidirectional switches included in these bidirectional switch sets, one of the two switches other than the bidirectional switch connected to the common connection point of the storage battery 8 and the capacitor 9 may be closed. In the example of bidirectional switch set (SRV, SSV, STV) in (1), either SRV or STV may be closed. This is because even if these switches are closed, a new closed circuit is not generated, and the charging circuit of the storage battery is not different from that in the switching state shown in (1).

Next, the case where the emergency power supply after the regeneration capacitor 9 is charged will be described. When the power abnormality detection signal is input, the phase detection circuit selector switch 18 outputs the fixed phase information generation circuit 15 to the controller 13. As an example of the fixed phase information, information indicating which phase of the input three phases the storage battery 8 and the regenerative capacitor 9 are connected to is replaced with a phase. The storage battery 8 and the regenerative capacitor 9 are connected between any of the R phase, S phase, and T phase of the three-phase AC power source 1 by the power switch 5. As an example of the fixed phase information, a phase output from the input power supply phase detection circuit 14 when the phase voltage of the R phase becomes a positive or negative maximum value is expressed between the R phase and the S phase. Similarly, the phase between the S phase and the T phase is represented by a phase output from the input voltage phase detection circuit 14 when the phase voltage of the S phase has a positive or negative maximum value, and between the T phase and the R phase. Is expressed as a phase output from the input voltage detection circuit when the phase voltage of the T phase has a positive or negative maximum value. In the case of FIG. 2, since the positive terminal of the storage battery 8 is connected to the R phase and the negative terminal is connected to the S phase, the fixed phase information about the storage battery 8 is the input voltage phase when the phase voltage of the R phase is a positive maximum value. The phase is output from the detection circuit 14. Further, since the negative terminal of the regenerative capacitor 9 is connected to the S phase and the positive terminal is connected to the T phase, the phase information about the regenerative capacitor 9 is that the phase voltage of the S phase is the negative maximum value. In this case, the phase is output from the input phase detection circuit 14. In this way, the fixed phase information is a combination of three combinations of the R phase and S phase, the S phase and T phase, and the T phase and R phase among the above three input phases, and whether each is positive maximum or negative maximum. It may be an encoded signal for identifying a total of six states shown.

For the determination of power running and regeneration, the output current detection value obtained by detecting the output current of the PWM cycloconverter by the output current detection circuit 16 and the output voltage command originally calculated by the controller 13 are input to the power running regeneration discrimination circuit 17. Thus, the power running regeneration determination circuit 17 performs the operation. The power running regeneration determination circuit 17 outputs a power running regeneration determination signal to the controller 13 and the fixed phase information generation circuit 15 based on the determination result.
The power running regeneration discrimination circuit 17 obtains the phase difference between the output voltage and the output current from the output phase voltage command and the output current detection value. In order to obtain the phase difference φ, the power running regeneration discriminating circuit 17 converts each of the three-phase output phase voltage command and the three-phase output current detection value by generally known three-phase → two-phase (dq axis) conversion. A vector conversion circuit for converting into a vector quantity on dq coordinates is provided, and this vector conversion circuit outputs an output voltage vector converted from the output phase voltage command and an output current vector converted from the output current detection value. Since the phase difference φ is an angle formed by these two vectors, the power running regeneration determination circuit 17 includes a phase difference calculation circuit that calculates an angle formed by the two vectors. As a specific example, the phase angle θ of the output voltage and output current is defined below. Here, X represents a vector of voltage, current, etc., and either an output voltage vector or an output current vector generally holds and may be either. The _{X d} is d-axis component of the vector X, the _{X q} represents the q-axis component of the vector X.
When X _d ≧ 0 and X _q ≧ 0, θ = sin ⁻¹ (X _d / √ (X _d ² + X _q ² ))
When X _d ≧ 0, X _q <0 or X _d <0, X _q <0, θ = π−sin ⁻¹ (X _d / √ (X _d ² + X _q ² ))
When Xd <0 and Xq ≧ 0, θ = 2π + sin ⁻¹ (X _d / √ (X _d ² + X _q ² ))

The phase angle θ described above is an angle formed by the vector X and the d-axis. If the phase angle θ obtained for the output current and the output voltage is θi _out and θv _out , respectively, the levels of the output voltage and the output current are obtained. The phase difference φ can be obtained by Expression (1).
φ = θv _out −θi _out (1)
The phase difference calculation circuit calculates the phase difference φ between the output voltage and the output current according to equation (1). The power running regeneration determination circuit 17 includes a phase difference determination unit, and the phase difference determination unit determines whether the PWM cycloconverter is in a power running operation or a regenerative operation by the following determination method.
-2π ≦ φ ≦ (−3/2) π, −π / 2 ≦ φ ≦ π / 2, (3/2) π ≦ φ ≦ 2π Power running (−3/2) π <φ <−π / 2, π / 2 <φ <(3/2) π Regenerative operation

In addition, it is selected whether to use the storage battery 8 or the regenerative capacitor 9 as an emergency power source with an operating tool or the like provided separately, and an operation signal indicating the selection result is output to the PWM cycloconverter device by the input / output device or the IO device. As a control switching signal, a selection signal for selecting whether to use the storage battery 8 or the regenerative capacitor 9 is used, for example, using a logical sum of the power running regeneration determination signal instead of the power supply abnormality detection signal. The power running regeneration determination signal may be used instead of the power running regeneration determination signal.

  FIG. 4 shows a connection diagram of the bidirectional switch of the bidirectional switch module 7 that is turned on / off by the gate drive signal output by the controller 13 when it is determined that the power running operation is performed by the power running regeneration determination signal. In the figure, the bidirectional switch indicated by the solid line is turned on and off, and the switch indicated by the dotted line is always turned off. SRU is a bidirectional switch for connecting the positive side of the storage battery 8 and the U phase of the motor 3, and SRV and SRW are also bidirectional switches for connecting the V phase and W phase of the motor 3, respectively. SSU is a bidirectional switch for connecting the negative side of the storage battery 8 and the U phase of the motor 3, and SSV and SSW are also bidirectional switches for connecting the V phase and W phase of the motor 3, respectively. Only these six bidirectional switches are turned on / off by the gate drive signal output from the controller 13, so that the motor 3 is connected only to the storage battery 8, and the PWM control of the voltage output to the motor 3 is performed based on the voltage of the storage battery 8. Done. The above gate drive signal operation is performed by selecting and outputting the line voltage having the maximum amplitude from the PWM method of the three-phase AC input three-phase AC output PWM cycloconverter when the above-described power supply abnormality detection signal is not input. In the PWM method, the phase of the input voltage is equal to the operation of the gate drive signal when the line voltage between the R phase and the S phase is the maximum and the phase voltage of the R phase is a positive value. When the fixed phase information generation circuit 15 determines that the power running is based on the power regeneration discrimination signal, the fixed phase information for the storage battery 8 has the maximum line voltage between the R phase and the S phase and the phase of the R phase. The phase at which the voltage is a positive value (example of first fixed phase information) is output to the phase detection circuit selector switch 18. Therefore, the controller 13 switches the PWM method to a PWM method (an example of a PWM method of a DC input three-phase AC output) that selects and outputs a line voltage having the maximum amplitude, and outputs a phase from the fixed phase information generation circuit 15. Based on the fixed phase information input via the detection circuit changeover switch 18 and the voltage value of the storage battery 8 calculated by subtraction from the input voltage value output from the input power supply level detection circuit 10, the on / off signal of the bidirectional switch is Generate.

  FIG. 5 shows a connection diagram of the bidirectional switch of the bidirectional switch module 7 that is turned on / off by the gate drive signal output from the controller 13 when it is determined that the regenerative operation is based on the power running regeneration determination signal. As in FIG. 4, the bidirectional switch indicated by the solid line is turned on and off, and the switch indicated by the dotted line is always off. SRT is a bidirectional switch for connecting the positive side of the regenerative capacitor 9 and the U phase of the motor 3, and STV and STW are also bidirectional switches for connecting the V phase and W phase of the motor 3, respectively. . SSU is a bidirectional switch for connecting the negative side of the regenerative capacitor 9 and the U phase of the motor 3, and SSV and SSW are also bidirectional switches for connecting the V phase and W phase of the motor 3, respectively. . Only these six bidirectional switches are turned on / off by a gate drive signal output from the controller 13, whereby the motor 3 is connected to the regenerative capacitor 9 and the voltage output to the motor 3 based on the voltage of the regenerative capacitor 9. PWM control is performed. The above gate drive signal operation is performed by selecting and outputting the line voltage having the maximum amplitude from the PWM method of the three-phase AC input three-phase AC output PWM cycloconverter when the above-described power supply abnormality detection signal is not input. In the PWM method, the phase of the input voltage is equal to the operation of the gate drive signal when the line voltage between the S phase and the T phase is the maximum and the phase voltage of the S phase is a negative value. When the fixed phase information generation circuit 15 determines that regeneration is based on the power regeneration determination signal, the fixed phase information generation circuit 15 has a phase (second fixed phase) in which the phase voltage of the S phase becomes a negative value as the fixed phase information about the regeneration capacitor 9 described above. Example of phase information) is output to the phase detection circuit changeover switch 18. Therefore, the controller 13 selects the line voltage having the maximum amplitude and outputs it from the fixed phase information generation circuit 15 via the phase detection circuit changeover switch 18 by the PWM method in which the line voltage having the maximum amplitude is selected and output as in the case of the power running described above. ON / OFF of the bidirectional switch on the basis of the fixed phase information input and the voltage value of the regenerative capacitor 9 calculated by subtraction from the input voltage value output from the input voltage value that is the output of the input power supply level detection circuit 10 Generate a signal.

  Note that the PWM method for DC input and three-phase output specifies a bidirectional switch that connects the two phases corresponding to the line and the output three-phase if the direct line voltage input line is specified without using phase information. Alternatively, the time ratio for outputting the output voltage may be obtained based on the ratio of the voltage command to the DC voltage value calculated from the input power supply level detection circuit 10. In this case, the fixed phase information generated by the fixed phase information generation circuit 15 is a combination of three combinations of the R phase and the S phase, the S phase and the T phase, and the T phase and the R phase among the three input phases. It may be an encoded signal that identifies a total of six states indicating maximum or negative maximum.

With the above configuration, the PWM cycloconverter device of the present invention performs the three-phase input / three-phase output operation when the power supply abnormality has not occurred, and when the power supply abnormality has occurred, only the storage battery 8 is used during powering. In use, during regeneration, only the regenerative capacitor 9 is used to absorb the regenerative power, and the DC input three-phase AC output operation can be performed. Further, when the regenerative capacitor 9 is not charged, the storage battery 8 It is also possible to charge the regenerative capacitor 9.

DESCRIPTION OF SYMBOLS 1 3 phase alternating current power supply 2 Elevator drive device 3 Motor 4 Load device 5 Power supply switch 6 Input filter 7 Bidirectional switch module 8 Storage battery 9 Regenerative capacitor 10 Input power supply level detection circuit 11 Power supply abnormality detection circuit 12 Gate driver 13 Control controller 14 Input power phase detection circuit 15 Fixed phase information generation circuit 16 Output current detection circuit 17 Power regeneration discrimination circuit 18 Phase detection circuit changeover switch 19 Emergency power supply phase detection circuit 20 Phase detection circuit switch setting device 21 Emergency three-phase AC power supply 22 Emergency single-phase AC power supply 23 Large capacitor 24 Input filter reactor 25 Input filter capacitor

Claims (6)

The input side is connected to a three-wire power source, the output side is connected to a three-phase motor,
A bidirectional switch module comprising nine bidirectional switches connecting the three-wire power source and the three-phase motor;
An input power supply level detection circuit that detects a voltage value input from the three-wire power supply and outputs an input voltage value;
An input power supply phase detection circuit that detects the phase of the three-wire power supply and outputs an input power supply phase;
A fixed phase information generation circuit that generates and outputs a plurality of fixed phase information, and selects any one of the plurality of fixed phase information according to a control switching signal;
In response to an emergency power supply switching signal, the input power supply phase and the selected fixed phase information are switched, and a phase detection circuit selector switch that inputs either to the control controller;
And a controller that generates and outputs an on / off signal of the bidirectional switch module while switching a PWM method in accordance with the emergency power supply switching signal. In response to the emergency power supply switching signal, the control controller performs the on / off in a three-phase AC input three-phase AC output PWM method based on an input voltage value that is an output of the input power supply level detection circuit and the input power supply phase. Whether to generate a signal, or to generate the on / off signal by a PWM method of a DC input three-phase AC output based on the input voltage value and either the first fixed phase information or the second fixed phase information The PWM cycloconverter device according to claim 1, wherein the PWM cycloconverter device is switched. An output current detection circuit for detecting an output current of the bidirectional switch module;
A power running regeneration determination circuit that generates a power running regeneration determination signal based on an output voltage command output by the controller and an output current detection value output by the output current detection circuit;
The control switching signal is the power running regeneration determination signal, and the fixed phase information generation circuit, when the power running regeneration determination signal determines a power running state, represents the first line between the one line of the three-wire power source. 2. The fixed phase information is selected, and when the power running regeneration determination signal determines the regeneration state, the second fixed phase information representing the distance between the other one line of the three-wire power source is selected. Or a PWM cycloconverter device according to 2; The three-wire power source is a three-wire AC power source and a storage battery both terminals connected between the one of the three wires, and a regenerative capacitor both terminals connected between the other one wire. A DC power source, and a power source switching device that switches and outputs the three-phase AC power source and the three-wire DC power source,
The controller outputs the emergency power switching signal to the power switching unit, and switches the three-phase AC power source and the three-wire DC power source by the power switching unit according to the emergency power switching signal. Depending on the switching signal, the on-off signal is generated by the PWM method of the three-phase AC input and the three-phase AC output that receives the voltage of the three-phase AC power source, or the voltage of the three-wire DC power source is input. Whether to generate the on-off signal by the PWM method of the DC input three-phase AC output is switched, the first fixed phase information is phase information representing the line between the two terminals of the storage battery, the first 4. The PWM according to claim 1, wherein the fixed phase information of 2 is phase information representing a line connection between both terminals of the regenerative capacitor. 5. Cycloconverter device. A power supply abnormality detection circuit that detects abnormality of the three-phase AC power supply and outputs a power supply abnormality detection signal,
The emergency power supply switching signal is the power supply abnormality detection signal. When the power supply abnormality signal is not output, the power supply switcher switches to the three-phase AC power supply, and when the power supply abnormality detection signal is output. When the power switch is switched to the three-wire DC power source, and the controller does not output the abnormality detection signal, the three-phase AC input three-phase AC output using the voltage of the three-phase AC power source as an input The on / off signal is generated by the PWM method, and when the abnormality detection signal is not output, the on / off signal is generated by the PWM method of the DC input three-phase AC output using the voltage of the three-wire DC power supply as an input. The PWM cycloconverter device according to claim 4, wherein: The control controller is a bidirectional switch composed of three bidirectional switches for connecting each phase of the input three phases and one phase of the output, which are in three pairs in the bidirectional switch module, when charging the regenerative capacitor. In a set, all bidirectional switch sets turn off the bidirectional switch connected to the input phase connected to the common connection point of the storage battery and the regenerative capacitor, and at least one bidirectional switch set and the other two inputs 5. The PWM cycloconverter device according to claim 4, wherein both of the two bidirectional switches connected to the phase are turned on.

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