JP2010143690A - Capacity determining device of storage battery and regenerative power processing device having the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a capacity determining device of a storage battery without requiring a load resistance of large capacity for discharging the storage battery in a short time with an optional electric current and a DC switching device for connecting the load resistance to the storage battery. <P>SOLUTION: An elevator control device is provided with an induction heating device having a second inverter for converting a direct current of a DC circuit into an alternating current and an induction heater for consuming electric power by converting the power into heat by inducing an induced current in a heating element, and when evaluating the capacity of the storage battery provided in the elevator control device, makes the electric current flow to the induction heater from the storage battery by inputting an electric current command to the second inverter, detects the terminal voltage of the storage battery at that time, and determines as abnormal when terminal voltage is a reference voltage or less by comparing the detected terminal voltage with the reference voltage. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a storage battery capacity determination device that determines the capacity of a storage battery included in an elevator control device, and a regenerative power processing device including the same.

  The conventional storage battery capacity determination device detects the storage battery terminal voltage, discharge current, and temperature when the storage battery is discharged for a short time, and determines the remaining capacity of the storage battery from each detected value. The terminal voltage when the storage battery is discharged for a certain period of time with a specific constant current is estimated from the discharge characteristics when the battery is discharged for a short time with an arbitrary current, and compared with a determination reference value prepared in advance with the estimated terminal voltage ( For example, see Patent Document 1).

  According to this storage battery capacity determination device, the storage battery remaining capacity can be accurately determined by reducing the influence of the change in the terminal voltage due to the storage battery temperature and the change in the terminal voltage due to the discharge current value, which greatly affects the accuracy of the storage battery remaining capacity determination. can do.

JP-A-9-227050

  However, the storage battery capacity determination device as described above requires a large load resistance for discharging the storage battery with an arbitrary current for a short time and a DC switch for connecting the load resistance to the storage battery. There was a problem of increasing the size.

  The present invention has been made to solve the above-described problems, and includes a load resistor having a large capacity for discharging the storage battery with an arbitrary current for a short time and a DC switch for connecting the load resistance to the storage battery. An object of the present invention is to provide an unnecessary storage battery capacity determination device.

  In the storage battery capacity determination device according to the present invention, an alternating current obtained by converting a direct current converted from the power of the alternating current power source by the first inverter is input to the motor that drives the load, and is separately input to the first inverter. A capacity determination device for a storage battery that evaluates the capacity of a storage battery that supplies direct current power, a restraining means for restraining the motor, a power supply smoothing capacitor connected in parallel to the first inverter, and the power smoothing A second inverter composed of at least one switching element connected in parallel to the capacitor and converting direct current to alternating current; and at least one coil connected to the second inverter; And a heating element provided at a position where the magnetic flux generated by the coil passes, and at the same time, an incentive to consume regenerative power from the motor. An induction heating device having a heater, a second regenerative command means for flowing a current from the storage battery to the induction heater by inputting a current command to the second inverter, and the current command when the current command is generated The terminal voltage of the storage battery is detected, and a voltage detection means for generating a voltage detection signal is compared with the voltage detection signal and the reference voltage signal, and when the voltage detection signal is equal to or lower than the reference voltage signal, it is determined as abnormal. An abnormality determination means.

  The effect of the storage battery capacity determination device according to the present invention is that when the regenerative power is large, the AC power is disconnected from the induction heater that consumes a part of the regenerative power, and the current is passed from the storage battery while the motor is stopped. Thus, the presence or absence of abnormality is determined based on the terminal voltage of the storage battery, so that a dedicated load resistor and a DC switch for opening and closing the load resistor are not required.

Embodiment 1 FIG.
A storage battery capacity determination device according to Embodiment 1 of the present invention will be described with reference to FIGS. FIG. 1 is an overall configuration diagram showing a capacity determination device for a storage battery according to Embodiment 1 of the present invention. FIG. 2 is a block diagram of the induction heating apparatus according to Embodiment 1 of the present invention. FIG. 3 is a schematic diagram of the induction heater according to Embodiment 1 of the present invention. FIG. 4 is a detailed view of the first inverter shown in FIG. FIG. 5 is a current or voltage waveform of each part of the capacity determination device for a storage battery according to Embodiment 1 of the present invention.
As shown in FIG. 1, the elevator control device 20 drives the motor 5 to rotate the sheave 7 of the hoist and raise or lower the car 11. One end of the rope 9 hung on the sheave 7 is fixed to the car 11, and the other end of the rope 9 is fixed to the counterweight 13. A brake 6 for restraining and releasing the sheave 7 is provided.

  The elevator control device 20 takes in the three-phase alternating current through the power switch 53a, rectifies the three-phase alternating current and converts it into direct current, the smoothing capacitor 23 that smoothes the obtained direct current, and the direct current is variable. It is generated in parallel with the smoothing capacitor 23 and the inverter 25 that drives the three-phase synchronous motor 5 by converting the voltage variable frequency to alternating current, and is generated from the motor 5 as in the case where the car 11 is lowered with a rated load. And an induction heating device 80 that consumes regenerative power.

In addition, the elevator control device 20 includes a storage battery 51 connected to the output of the rectifier 21 via a determination switch 53b interlocked with the power switch 53a. The determination switch 53b is closed in the case of determining the capacity of the storage battery 51 and in the case of a power failure, and is normally opened, and the power switch 53a is in the case of determining the capacity of the storage battery 51 and in the case of a power failure. It is open and normally closed.
When determining the capacity of the storage battery 51, the power switch 53a is opened, the determination switch 53b is closed, the brake switch 8 is opened, and the sheave 7 is restrained by the brake 6. .

As shown in FIG. 2, the induction heating device 80 includes an input filter circuit 82 composed of an inductor and a capacitor for suppressing fluctuations in voltage and current generated in the smoothing capacitor 23, and direct current of several kHz to several hundred KHz. A second inverter 84 for driving the induction heater composed of at least one or more switching elements, which is converted into alternating current of the degree and supplied to the induction heater 88, the induction heater 88, and the induction heater 88. And a resonance circuit 83 composed of one or more inductors and / or capacitors connected in series or in parallel.
In addition, as an element which comprises the 2nd inverter 84 for driving the induction heater 88, what kind of element may be used if it has switching functions, such as MOSFET, IGBT, thyristor, and a diode.
Further, the input filter circuit 82 may not be used when voltage fluctuation or current fluctuation generated in the smoothing capacitor 23 does not affect the smoothing capacitor 23 itself or other circuits.

As shown in FIG. 3, the induction heater 88 includes a heating element 220 mainly made of metal, a coil 221 for passing magnetic flux through the heating element 220, and a terminal 222 for connecting an external circuit to the coil 221. It consists of.
In the induction heater 88, the heating element 220 and the coil 221 are separated, and power is supplied to the heating element 220 in a non-contact manner. Further, the heating element 220 is a lump of metal such as iron, and it is less necessary to protect it from the outside air or mechanical shock than a resistor. For this reason, the heating element 220 can be brought into direct contact with air without the need for a base or an exterior.

Then, the elevator control device 20 generates a current command signal for driving the first inverter 25, and the deviation between the first current detection value obtained by detecting the current flowing through the motor 5 from the first current detector 29 and the current command signal. The first motor command unit 31 that controls the first inverter 25 via the first switch 71 and the first regeneration command unit 33 that generates a voltage command signal that drives the second inverter 84 are provided.
Then, the voltage detector 36 detects the voltage of the DC circuit 15 to generate a voltage detection signal, and the first regeneration command unit 33 turns on the second inverter 84 when the DC voltage value becomes higher than a predetermined threshold value. When turned on and lower than the threshold, the second inverter 84 is turned off.
The first switch 71 and the second switch 73 are turned on to the b side when determining the capacity of the storage battery, and are turned on to the a side in a normal case.
In addition, the voltage detector 36, the 1st regeneration command part 33, the 1st switch 73, and the induction heating apparatus 80 are collectively called a regenerative electric power processing apparatus. This regenerative power processing device is consumed by the induction heating device 80 to protect the control device 20 of the elevator when the voltage of the DC circuit 15 becomes higher than a predetermined threshold due to the power regenerated by the motor 5.

The capacity determination device 60 of the storage battery detects the current flowing through the connection line between the rectifier 21 and the first inverter 25 and generates the second current detection signal, and from the storage battery 51 during the determination. A direct current command unit 61 that generates a direct current command signal for supplying the maximum value of the direct current to be supplied, and a second regeneration that turns on / off the second inverter 84 via the second switch 73 by the direct current command signal. A command unit 67 and a second motor command unit 69 for turning on / off the transistors Tr1 to Tr6 of the first inverter 25 via the first switch 71 by a direct current command signal are provided. Here, at the time of determination, either one of the second regeneration command unit 67 or the second motor command unit 69 is operated from the storage battery 51 so that a current flows to the motor 5 or the induction heater 88.
The direct current command signal generated from the direct current command unit 61 is required for the car 11 to travel at a speed of about 1/10 of the rated speed with a 120% load when the three-phase alternating current power source e fails. A direct current is supplied to the first inverter 25.

  The abnormality determination unit 75 compares the voltage detection signal that has detected the voltage of the storage battery 51 with the reference voltage signal, determines that the voltage detection signal is equal to or lower than the reference voltage signal, and determines that the display 77 has an abnormality. indicate.

As shown in FIGS. 4 and 5, the second motor command unit 69 avoids a short circuit and applies a DC chopper voltage at which the motor 5 does not rotate to the motor 5 to cause a DC current to flow. , One of the upper transistors Tr1 to Tr3 and the lower transistors Tr4 to Tr6 which are different from each other in the W phase are selected and turned on / off as a pair.
Further, by changing the transistors that are turned on / off when a predetermined time has elapsed, for example, the upper transistor Tr1 and the lower transistor Tr6 are turned on / off in the time zone ta, and the upper transistors Tr2, One cycle is to turn on and off the lower transistor Tr5 and turn on and off the upper transistor Tr3 and the lower transistor Tr4 in the time zone tc. Thereby, the thermal burden of each transistor Tr1-Tr6 is reduced.

The operation of the storage battery capacity determination device 60 configured as described above will be described with reference to FIGS.
First, the case where an electric current is passed through the induction heater 88 will be described.
At the time of determination, the power switch 53a is opened to cut off the three-phase alternating current e, and the determination switch 53b is turned on to connect the storage battery 51 in parallel with the smoothing capacitor 23.
The brake switch 8 is opened and the sheave 7 is restrained by the brake 6. The first switch 71 and the second switch 73 are turned on to the b side, the DC current command signal generated from the DC current command unit 61 is turned on via the second regeneration command unit 67 and the second switch 73, and the second inverter 84 is turned on. The chopper current is passed through the induction heater 88 as shown in FIG.
The voltage detector 36 detects the terminal voltage of the storage battery 51 and inputs a voltage detection signal to the abnormality determination unit 75.
The abnormality determination unit 75 compares the voltage detection signal with the reference voltage signal, determines that the voltage detection signal is equal to or lower than the reference voltage signal, and displays an abnormality on the display 77.

Next, a case where a current is supplied to the motor 5 will be described.
At the time of determination, the power switch 53a is opened to cut off the three-phase alternating current e, and the determination switch 53b is turned on to connect the storage battery 51 in parallel with the smoothing capacitor 23.
The brake switch 8 is opened and the sheave 7 is restrained by the brake 6. The first switch 71 and the second switch 73 are turned to the b side, and the DC current command signal generated from the DC current command unit 61 is transferred to the inverter 25 via the second motor command unit 69 and the first switch 71. As shown in FIG. 5C, the chopper voltage is applied to the motor 5 as shown in FIG. The voltage detector 36 detects the terminal voltage of the storage battery 51 and inputs a voltage detection signal to the abnormality determination unit 75.
The abnormality determination unit 75 compares the voltage detection signal with the reference voltage signal, determines that the voltage detection signal is equal to or lower than the reference voltage signal, and displays an abnormality on the display 77.

  In the storage battery capacity determination device 60 according to Embodiment 1 of the present invention, the three-phase alternating current from the three-phase alternating current power source e is once converted into direct current, and the converted direct current is converted into alternating current of a voltage-available frequency. Of the storage battery that drives the load by rotating the motor 5 that is converted by 25 and rotated by the converted alternating current with the direct current from the storage battery 51 by the alternating current of the voltage capable frequency converted by the first inverter 25. This is a capacity determination device 60.

  The capacity determination device 60 of the storage battery is connected to the brake 6 that restrains the motor 5, the smoothing capacitor 23 connected in parallel to the first inverter 25, the parallel connection to the smoothing capacitor 23, and converts direct current into alternating current. For this purpose, the second inverter 84 is composed of a switching element, and the coil is connected to the second inverter 84 and a heating element is provided at a position where the magnetic flux generated in the coil passes.

  In addition, an induction heating device 80 having an induction heater 88 that consumes regenerative power from the motor 5, and a direct current command unit 61 that drives the second inverter 84 by a current command to flow a current from the storage battery 51 to the induction heater 88. And a voltage detector 36 for detecting a terminal voltage of the storage battery 51 when the current command is generated, and generating a voltage detection signal, and comparing the voltage detection signal with the reference voltage signal to obtain a voltage detection signal. And an abnormality determination unit 75 that determines that the signal is equal to or lower than the reference voltage signal.

According to the storage battery capacity determination device 60 described above, in the determination, the brake switch 8 is opened, the sheave 7 is restrained by the brake 6, and the motor 5 connected to the sheave 7 is stopped, and the storage battery is The discharge current specified by 51 is passed through the induction heater 88, the terminal voltage of the storage battery 51 is detected by the voltage detector 36, and the abnormality determination unit 75 compares the voltage detection signal with the reference voltage signal to detect the voltage. If the signal is below the reference voltage signal, it is determined as abnormal.
As a result, current is passed from the storage battery 51 to the induction heater 88 to determine the presence / absence of an abnormality based on the terminal voltage of the storage battery 51, so that a dedicated load resistance and a DC switch for opening and closing the load resistance are unnecessary. Become.
In addition, since the electric power is converted into heat in the induction heater 88 and consumed, the volume can be reduced as compared with the case where electric current is supplied to the resistor and electric power is converted into heat.

Embodiment 2. FIG.
In the storage battery capacity determination device according to the first embodiment described above, the current supplied from the storage battery 51 flows to either the induction heater 88 or the motor 5, but the storage battery according to the second embodiment of the present invention. In this capacity determination apparatus, the current supplied from the storage battery 51 is caused to flow through both the induction heater 88 and the motor 5, thereby reducing the thermal burden on the induction heater 88 and the motor 5.
A storage battery capacity determination device according to Embodiment 2 of the present invention will be described with reference to FIG. FIG. 6 is an overall configuration diagram of an elevator according to Embodiment 2 of the present invention. In FIG. 6, the same reference numerals as those in FIG.
In FIG. 6, the storage battery capacity determination device 160 uses the direct current command signal to send the motor direct current command signal to be sent to the motor 5 and the resistance direct current command signal to be sent to the induction heater 88 to the heat capacity of the motor 5 and the inverter 25. A distributor 65 that distributes the heat capacity of the induction heater 88 and the second inverter 84 in consideration of the heat capacity is provided.

The operation of the storage battery capacity determination device 160 configured as described above will be described with reference to FIGS.
Now, the power switch 53 a is opened and the determination switch 53 b is closed to connect the storage battery 51 in parallel with the smoothing capacitor 23. The brake switch 8 is opened and the motor 5 is restrained by the brake 6. The first switch 71 and the second switch 73 are turned on to the b side.
A direct current command signal generated from the direct current command unit 61 is input to the distributor 65. The distributor 65 generates a motor DC current command signal and a resistance DC current command signal, and the motor DC current command signal passes through the second motor command unit 69 and the first switch 71 to the transistor of the first inverter 25 as shown in FIG. As shown in FIG. 5C, the chopper voltage is applied to the motor 5 as shown in FIG.

  On the other hand, the resistance direct current command signal is input to the second inverter 84 via the second regeneration command section 67 and the second switch 73, and the second inverter 84 is turned on / off to the induction heater 88 as shown in FIG. As shown in FIG. The voltage detector 36 detects the terminal voltage of the storage battery 51 and inputs a voltage detection signal to the abnormality determination unit 75. The abnormality determination unit 75 compares the voltage detection signal with the reference voltage signal, determines that the voltage detection signal is equal to or lower than the reference voltage signal, and displays an abnormality on the display 77.

  The capacity determination device 160 for a storage battery according to Embodiment 2 of the present invention converts the three-phase alternating current from the three-phase alternating current power source e into direct current, and then converts the converted direct current into alternating current having a variable voltage and frequency. 25, and the motor 5 rotated by the converted alternating current is rotated by rotating the direct current from the storage battery 51 with the alternating current of the voltage capable frequency converted by the first inverter 25 in the event of a power failure or the like. It is an apparatus for determining the capacity of the storage battery 51 to be driven.

  The storage battery capacity determination device 160 is connected to the brake 6 that restrains the motor 5 in the event of a power failure, the smoothing capacitor 23 connected in parallel to the first inverter 25, the parallel connection to the smoothing capacitor 23, and the direct current to alternating current. And a heating element connected to the second inverter 84 and provided at a position where the magnetic flux generated in the coil passes.

  In addition, an induction heating device 80 having an induction heater 88 that consumes regenerative power from the motor 5, and a direct current command unit 61 that drives the second inverter 84 by a current command to flow a current from the storage battery 51 to the induction heater 88. And a voltage detector 36 for detecting a terminal voltage of the storage battery 51 when the current command is generated, and generating a voltage detection signal, and comparing the voltage detection signal with the reference voltage signal to obtain a voltage detection signal. And an abnormality determination unit 75 that determines that the signal is equal to or lower than the reference voltage signal.

According to the capacity determination device, a current is passed from the storage battery 51 to the motor 5 and the induction heater 88 to detect the terminal voltage of the storage battery 51 by the voltage detector 36, and the abnormality determination unit 75 detects the voltage detection signal and the reference voltage signal. And the voltage detection signal is determined to be abnormal if it is equal to or lower than the reference voltage signal.
As a result, current is passed from the storage battery 51 to the motor 5 and the induction heater 88 to determine whether there is an abnormality based on the terminal voltage of the storage battery 51. While becoming unnecessary, the temperature rise of the motor 5 and the induction heater 88 can be suppressed.

Embodiment 3 FIG.
FIG. 7 is a schematic diagram of an induction heater according to Embodiment 3 of the present invention.
The elevator control device according to Embodiment 3 of the present invention is different from the elevator control device according to Embodiment 1 of the present invention, except for the induction heating device. Additional description will be omitted.

  The rated power in induction heater 88 according to Embodiment 1 is determined by the heat resistant temperature of the wire of coil 221 used for power feeding. The coil 221 generates heat due to radiation from the heating element 220, heat transfer through a medium such as air between the coil 221 and the heating element 220, power loss of the coil itself, and the like. Therefore, if the heat transfer between the coil 221 and the heating element 220 can be reduced, the temperature of the heating element 220 can be melted or deformed, or the electrical characteristics change (change in magnetic susceptibility when the Curie point is exceeded). If the phenomenon such as) does not occur, it may be any number of times.

In order to reduce the heat transfer between the coil 221 and the heating element 220, the heat transfer coefficient of the medium between them may be reduced. Therefore, in the induction heater 88B according to Embodiment 3 of the present invention, as shown in FIG. 7, the coil 221 and the heating element 220 are used to reduce the heat transfer coefficient of the medium between the coil 221 and the heating element 220. A plate-like heat insulating material 230 is inserted between the two. As the heat insulating material 230, glass wool, rock wool, phenol foam, polystyrene foam or the like may be used as long as it has a low heat transfer coefficient and can withstand the temperature of the heating element 220.
Thus, by inserting the plate-shaped heat insulating material 230 between the coil 221 and the heating element 220, the rated power of the induction heater 88B can be increased.

It is a block diagram of the elevator by which the storage battery capacity determination apparatus which concerns on Embodiment 1 of this invention was arrange | positioned. It is a block diagram of the induction heating apparatus which concerns on Embodiment 1 of this invention. It is a schematic diagram of the induction heater which concerns on Embodiment 1 of this invention. It is a circuit diagram of the inverter which concerns on Embodiment 1 of this invention. It is the time series data of the command signal of a 2nd inverter, the electric current of an induction heater, the signal applied to the grid of the transistor of a 1st inverter, the motor voltage, and the electric current which flows into a storage battery. It is a block diagram of the elevator by which the storage battery capacity determination apparatus which concerns on Embodiment 2 of this invention was arrange | positioned. It is a schematic diagram of the induction heater which concerns on Embodiment 3 of this invention.

Explanation of symbols

  5 motor, 6 brake, 7 sheave, 8 brake switch, 9 rope, 11 cage, 13 counterweight, 15 DC circuit, 20 control device, 21 rectifier, 23 smoothing capacitor, 25 inverter, 29 current detector, 31 1st Motor command unit, 33 First regeneration command unit, 34 Current detector, 36 Voltage detector, 51 Storage battery, 53a Power switch, 53b Judgment switch, 60 Capacity judgment device, 61 DC current command unit, 65 Distributor, 67 Second Regenerative command unit, 69 Second motor command unit, 71 First switch, 73 Second switch, 75 Abnormality determination unit, 77 Display, 80 Induction heating device, 82 Input filter circuit, 83 Resonance circuit, 84 Second inverter, 88 , 88B induction heater, 160 capacity determination device, 220 heating element, 221 coil, 222 terminal, 230 Insulating material, e Three-phase AC power source, ta, tb, tc time zone, Tr1, Tr2, Tr3 upper transistor, Tr4, Tr5, Tr6 lower transistor.

Claims (5)

Evaluation of the capacity of the storage battery that supplies the DC power that is separately input to the first inverter to the motor that drives the load while the AC that has been converted from the DC power once converted by the first inverter is input again A capacity determination device for a storage battery,
Restraining means for restraining the motor;
A power supply smoothing capacitor connected in parallel to the first inverter;
A second inverter connected in parallel to the power source smoothing capacitor and configured to convert at least one switching element for converting direct current to alternating current;
Induction having an induction heater connected to the second inverter and comprising at least one coil and a heating element provided at a position where a magnetic flux generated by the coil passes, and consuming regenerative power from the motor A heating device;
A second regenerative command means for passing a current from the storage battery to the induction heater by inputting a current command to the second inverter;
Voltage detection means for detecting a terminal voltage of the storage battery when the current command is generated and generating a voltage detection signal;
An abnormality determination means for comparing the voltage detection signal with a reference voltage signal and determining an abnormality when the voltage detection signal is equal to or lower than the reference voltage signal;
A capacity determination device for a storage battery, comprising:   The apparatus according to claim 1, further comprising second motor command means for causing a designated discharge current to flow from the storage battery to the motor and keeping the motor stopped even if the discharge current flows. Storage battery capacity determination device. The first inverter has first to third upper semiconductor switch means and first to third lower semiconductor switch means respectively corresponding to three-phase phases;
The first upper semiconductor switch means and the first lower semiconductor switch means, the second upper semiconductor switch means and the second lower semiconductor switch means, and the third upper semiconductor switch means and the third lower semiconductor switch means. Are connected in series,
The second motor command means turns on and off the first upper semiconductor switch means and the second lower semiconductor switch means, and then turns on and off the second upper semiconductor switch means and the third lower semiconductor switch means. The capacity determination device for a storage battery according to claim 2.   The induction heating according to any one of claims 1 to 3, further comprising: an induction heater; and a resonance circuit having at least one of one or more inductors or capacitors connected in series or in parallel to the induction heater. A regenerative power processing apparatus comprising the apparatus.   The regenerative power processing apparatus according to claim 4, wherein a heat insulating material is provided between the coil of the induction heater and the heating element.

Images