JP3662085B2 - Constant voltage device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a constant voltage device, and more particularly to a constant voltage device dedicated to single-phase illumination.
[0002]
[Prior art]
In recent years, an increasing number of stores use a large amount of lighting equipment over a long period of time, such as 24-hour convenience stores and large discount stores.
[0003]
By the way, it has been proved that lighting fixtures such as fluorescent tubes and incandescent lamps have the highest illumination efficiency near 190V and have a long lifetime. However, the above-mentioned store is supplied with an input voltage of about 200 to 220 V constantly changing. As a result, these stores have problems such as not only wasteful use of electric energy in the lighting fixtures but also a short life of the lighting fixtures.
[0004]
[Problems to be solved by the invention]
The present invention has been made in order to solve the above-described conventional problems, and an object of the present invention is to be able to efficiently consume power energy and extend the life of a lighting fixture. The object is to provide a voltage device.
[0005]
[Means for Solving the Problems]
The constant voltage device of the present invention comprises a sliding winding connected in parallel between the voltage lines in a single-phase three-wire circuit comprising two voltage lines and one neutral line between the voltage lines. electric slider and consisting slider to obtain a continuous slide to voltage drop along the sliding Domaki line; during one of the voltage lines and the slider of the two voltage lines A multi-turn transformer comprising a connected primary winding and two secondary windings respectively connected in series to two voltage lines; a feedback circuit for detecting an output voltage between the two voltage lines; A control circuit for comparing the detected voltage from the feedback circuit with a set voltage to calculate a correction value and outputting a command signal; sliding the slider of the electric slider in the correction direction by the command signal from the control circuit; An electronically controlled AC motor to be operated; and . In addition, a limit switch is provided at one end of the sliding winding of the electric slider, and an emergency automatic commercial switching circuit is provided between the limit switch and the primary winding, so that the slider of the electric slider is worn. When the current stops flowing in the primary winding of the compound transformer, the slider is activated to operate the limit switch, and then the emergency automatic commercial switching circuit is activated to operate the two voltage lines. It is characterized by providing a commercial voltage between them.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a circuit diagram for explaining the operating principle of the constant voltage device according to the present invention. The primary winding is b, the secondary winding is a, and both ends of the secondary winding a are input terminals R. In a multi-winding transformer connected in series between output terminals r, when a primary voltage of Y volts is applied to the primary winding b side, a voltage of Y × a / b volts is applied to the input voltage X (between the input terminals R and T Voltage). Therefore, if the output voltage (voltage between the output terminals r and t) is K, the relational expression K = X−Ya / b is established. According to this relational expression, X and Y are linear functions proportional to K. Therefore, even if the input voltage X fluctuates, the output voltage K is made constant by interlocking the primary voltage Y. Is possible.
[0007]
FIG. 2 shows an embodiment of the constant voltage device of the present invention based on the above operating principle, wherein R, N and T are input terminals of the single-phase three-wire circuit constant voltage device, and r, n and t Is an output terminal, a voltage line between terminals R-r and T-t, and a neutral line between terminals N-n.
[0008]
Reference numeral 1 denotes an electric slider, and both ends of the sliding winding 1a are connected to both voltage lines from the input terminals R and T. The slider 1b of the electric slider 1 is continuously driven to slide along the sliding winding 1a by an electronically controlled AC motor 2.
[0009]
Reference numeral 3 denotes a multi-winding transformer, which includes a primary winding 3a, secondary windings 3b and 3c, an iron core 3d, and the like. Both ends of the primary winding 3a are connected to the voltage line from the input terminal R and the slider 1b. Further, both end portions of the secondary winding 3b are connected in series to a power line between the input terminal R and the output terminal r. Furthermore, both ends of the secondary winding 3c are connected in series to a power line between the input terminal T and the output terminal t.
[0010]
A feedback circuit 4 detects the output voltage K between the output terminals r and t, and outputs the detected voltage value to the control circuit 5. The control circuit 5 compares the desired output voltage set by the output voltage arbitrary setting circuit 6 with the output voltage K detected by the feedback circuit 4 to calculate a correction value, and the electronic control AC motor 2 Is output as a command signal.
[0011]
Reference numeral 7 denotes an emergency automatic commercial switching circuit which is activated when the limit switch 8 is activated.
[0012]
Next, the operation of the constant voltage device of the above embodiment will be described. A commercial voltage that fluctuates at about 200 to 220 volts is applied between the input terminals R and T, and this input voltage is dropped in advance by the electric slider 1 so that the primary winding 3a of the compound transformer 3 is primary. Give as voltage.
[0013]
In the compound transformer 3, a secondary voltage is induced in the secondary windings 3b and 3c based on the primary voltage applied to the primary winding 3a. The output voltage between the secondary windings 3 b and 3 c is detected by the feedback circuit 4, and the detected value is output to the control circuit 5.
[0014]
On the other hand, the set voltage set in the output voltage arbitrary setting circuit 6 is set to an arbitrary value between 186 and 198 volts, for example, and is compared with the detected value from the feedback circuit 4 in the control circuit 5. A correction value is calculated.
[0015]
When the detected voltage from the feedback circuit 4 is higher than the set voltage, a command signal is output to the electronic control motor 2 so that the voltage applied to the primary winding 3a is lowered, and the sliding of the electric slider 1 is performed. The child 1b is moved upward in FIG.
[0016]
When the detected voltage from the feedback circuit 4 is lower than the set voltage, a command signal is output to the electronic control motor 2 so as to increase the voltage applied to the primary winding 3a, and the sliding of the electric slider 1 is performed. The child 1b is moved downward in FIG.
[0017]
As described above, the output voltage K between the output terminals r and t is constantly monitored by the feedback circuit 4, and the slider 1b of the electric slider 1 is applied to the sliding winding 1a so as to maintain a predetermined set voltage. Slide along.
[0018]
When the carbon of the slider 1b of the electric slider 1 reaches an extreme wear state due to long-term operation, and as a result, no current flows between P-Q, and the constant voltage control as described above becomes impossible. In this case, the slider 1b of the electric slider 1 operates to quickly operate the limit switch 8. When the limit switch 8 is activated, the emergency automatic commercial switching circuit 7 is activated, and a current flows between the primary windings 3a of the multi-turn transformer 3 to switch to the commercial bypass circuit.
[0019]
【The invention's effect】
1)
Since 200V between R and T is used as the primary winding, and the secondary winding 10-16V is formed on the same iron core, it is possible to reduce the weight, reduce the installation space, and reduce the price by using a multi-winding transformer. it can.
2)
The combination of the electric slider and the compound winding transformer is configured to maintain the desired voltage by electronic control. In particular, not only is it possible to prevent wasteful use of power energy, but also the life of the luminaire is extended. can do.
3)
Since the constant voltage device of the present invention is exclusively intended to lower the commercial voltage, it is possible to reduce the size.
4)
If the slider of the electric slider becomes extremely worn due to long-term maintenance, and the primary side of the multi-winding transformer becomes open and becomes uncontrollable, the primary side of the multi-winding transformer is quickly short-circuited by the dry contact of the limit switch. Since it is configured to switch to the commercial bypass, the crash safety can be effectively achieved.
[Brief description of the drawings]
FIG. 1 is a circuit diagram illustrating the operating principle of a constant voltage device of the present invention.
FIG. 2 is a circuit diagram showing an embodiment of the constant voltage device of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Electric slider 1a Winding 1b Slider terminal 2 Electronically controlled AC motor 3 Compound transformer 3a Primary winding 3b Secondary winding 3c Secondary winding 3d Iron core 4 Feedback circuit 5 Control circuit 6 Output voltage arbitrary setting circuit 7 Automatic in emergency Commercial switching circuit 8 Limit switch a Secondary winding b Primary winding K Output voltage N Input terminal n Output terminal R Input terminal r Output terminal T Input terminal t Output terminal X Input voltage Y Primary voltage

Claims (2)

In a single-phase three-wire circuit comprising two voltage lines and one neutral line between the voltage lines, a sliding winding (1a) connected in parallel between the voltage lines, and the sliding winding line (1a) continuously sliding motorized slider (1) comprising a slider to obtain a voltage drop (1b) in the along; one of the voltage lines and the sliding of the two voltage lines A multi-winding transformer (3 ) composed of a primary winding (3a) connected between the child (1b) and two secondary windings (3b, 3c) connected in series to two voltage lines, respectively. ) ;; a feedback circuit (4) for detecting an output voltage between the two voltage lines; and a detection value from the feedback circuit (4) is compared with a set voltage to calculate a correction value and output a command signal control circuitry (5); said control circuit slider of the electric slider by a command signal from the (5) (1) (1b) A constant voltage device comprising: an electronically controlled AC motor (2) that slides in a correcting direction.   A limit switch (8) is provided at one end of the sliding winding (1a) of the electric slider (1), and an emergency automatic commercial switching circuit is provided between the limit switch (8) and the primary winding (3a). (7) is provided, and when the slider (1b) of the electric slider (1) is worn and no current flows through the primary winding (3a) of the multi-turn transformer (3), the slider (1) 1b) is activated to activate the limit switch (8), and then the emergency automatic commercial switching circuit (7) is activated to provide a commercial voltage between the two voltage lines. The constant voltage device according to claim 1.

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