JP3551477B2 - Switch control device - Google Patents

Description

【００３８】
そして、減電圧期間Ｔ_０ が経過して図３のｔｙになると、ステップＳ１１を肯定で通過してステップＳ７に移行し、通常の開放制御の場合と同様、制御信号Ｓ１をオフレベルに保ってトランジスタ１２をオフし、電磁コイル２ａの印加電圧を消失して開閉器２を開放する。
【００３９】
したがって、投入中の開閉器２を開放するときに、電磁コイル２ａの印加電圧が投入電圧Ｅ_１ より十分低い保持電圧Ｅ_２ 程度になり、従来装置の場合のような過大な開放サージの発生が防止され、トランジスタ１２，１６等の周辺回路部品の開放サージによる破損が防止され、信頼性が向上する。
【００４０】
そして、減電圧期間Ｔ_０ の制御信号Ｓ１のパルス周期は、前記実施例のように一定周期に設定しする代わりに、時間とともに長周期に可変してもよく、この場合は電磁コイル２ａの印加電圧が図３の破線▲１▼に示すように、実線▲２▼の一定周期の場合より滑らかに減少変化し、破損防止等が一層効果的に行える。
【００４１】
また、前記実施例では半導体スイッチ素子をトランジスタにより形成したが、半導体スイッチ素子がサイリスタ等の場合にも適用できるのは勿論である。
【００４２】
つぎに、前記実施例ではトランジスタ１２を介した主電源に基づくコンデンサ２０の充放電により、いわゆる自己バイアス制御でトランジスタ１６のスイッチングを制御したが、例えば制御部１からトランジスタ１６のベースに制御信号を供給してトランジスタ１６のスイッチングを制御してもよい。
そして、構成の簡素化等を図るときは、トランジスタ１６を省いてもよい。
【００４３】
つぎに、前記実施例においては、制御部１をマイクロコンピュータにより形成し、いわゆるソフトウエア処理で開閉器２を開閉制御したが、例えば、制御部１をゲート回路、タイマ回路等により形成し、いわゆるハードウエア処理により開閉器２を開閉制御するようにしてもよい。
【００４４】
また、平滑フィルタ１４等の構成は実施例に限定されるものではない。
そして、直流電気保持式の種々の開閉器の制御に適用できるのは勿論であり、この場合、主電源１３の電圧，減電圧期間Ｔ_０ 等は開閉器の特性等に応じて設定すればよい。
【００４５】
【発明の効果】
本発明は、以上説明したように構成されるため、以下に記載する効果を奏する。
制御部１の投入電圧制御により開閉器２の電磁コイル２ａに投入電圧が印加される開閉器２の投入中に開放制御が発生すると、制御切換手段により即時に投入電圧制御から非常開放制御に切換わり、開放制御手段により所定期間半導体スイッチ素子（トランジスタ１２）をスイッチングして電磁コイル２ａの印加電圧をほぼ保持電圧に減圧した後、半導体スイッチ素子をオフして電磁コイル２ａの給電を停止し、開閉器２を開放したため、半導体スイッチ素子がオフして開閉器２が開放する直前の電磁コイル２ａの印加電圧が投入電圧からほぼ保持電圧に減圧され、従来の投入電圧に伴う過大な逆サージの発生が防止され、この逆サージによる周辺部品の破損が防止されて信頼性が向上する。
【図面の簡単な説明】
【図１】本発明の開閉器制御装置の１実施例の結線図である。
【図２】図１の制御部の動作説明用のフローチャートである。
【図３】図１の動作説明用のタイミングチャートである。
【図４】従来装置の制御部の動作説明用のフローチャートである。
【図５】従来装置の動作説明用のタイミングチャートである。
【符号の説明】
１ 制御部
２ 開閉器
２ａ 電磁コイル
１２ 半導体スイッチ素子としてのトランジスタ
１４ 平滑フィルタ[0001]
[Industrial applications]
The present invention relates to a switch control device that controls the opening and closing of a DC electric holding switch.
[0002]
[Prior art]
Conventionally, this type of electric holding type switch is closed by being turned on by a relatively large input voltage, and thereafter, the applied voltage is reduced to a holding voltage and kept in a closed state.
Therefore, the conventional switch control device for controlling the opening and closing of the electric holding switch is configured as described below.
[0003]
Next, a conventional switch control device will be described with reference to FIG. 1 corresponding to one embodiment of the present invention.
FIG. 1 shows a case in which opening and closing control is performed by software processing of a computer. When triggered by power supply, a control unit 1 of a microcomputer operates an internal processing unit (CPU) 1a to execute an opening and closing control program stored in a ROM 1b. Is always executed using the working and information storage RAM 1c.
[0004]
The opening and closing control program conventionally formed by steps S ₁ to S ₉ shown in FIG. 4, the control unit 1 in step S ₁ of this program will be the first on the instruction command input wait ( "ON" command) (standby) .
[0005]
At t1, the switch 2 to be controlled, such as an AC circuit breaker, is turned on, the information switch 3 is pressed, and the contact signal of the "ON" command of the switch 3 is given to the input interface 1d of the control unit 1. is the, moves to put the voltage control of step S ₂ through a positive step S ₁ (Y), continuously supplying an oN signal from the output interface 1d on the light emitting diodes 4a of the photocoupler 4 for isolation, The diode 4a is turned on and held.
[0006]
When the diode 4a is turned on, the phototransistor 4b of the photocoupler 4 is turned on. At this time, since the diodes 5 and 6 are turned off, for example, the auxiliary power supply 7 of DC 15V is connected via the resistor 8, the collector and the emitter of the transistor 4b. This is supplied to the base of a drive control transistor 9 connected in Darlington to this transistor 4b, and this transistor 9 is turned on.
[0007]
Further, since the diode 10 is off, the auxiliary power supply 7 generates an on-level control signal S1 shown in FIG. The voltage is applied to the base of the main transistor 12 as an element, and the main transistor 12 turns on.
[0008]
The transistor 12 has a collector connected to the positive electrode of a main power supply 13 of, for example, DC 200 V, and an emitter connected to the smoothing reactor 15 of the smoothing filter 14, the electromagnetic coil 2a of the switch 2, and the collector and emitter of an auxiliary transistor 16 for opening and closing control. The power supply is connected to the negative electrode of the main power supply 13 via the power supply 13 and is provided between the main power supply 13 and the electromagnetic coil 2a.
[0009]
When the transistor 12 is turned on, the diodes 5, 6, and 10 are turned on, and the driving power supply for the transistors 4b and 9 is switched from the auxiliary power supply 7 to the main power supply 13. 12 keeps on.
[0010]
Further, the main power supply 13 via the reactor 15 is injected into the integrating capacitor 17 and also into the time constant capacitor 20 via the diode 18 and the resistor 19, and the charging of the capacitor 20 causes the charging through the resistor 21. Thus, an on-level control signal S2 shown in FIG. 5 is applied to the base of the transistor 16, and the transistor 16 is turned on.
[0011]
Then, when the transistor 16 is turned on, the electromagnetic coil 2a is energized and driven by the main power supply 13 via the reactor 15.
[0012]
At this time, since the transistor 12 is turned on continuously, substantially larger-on voltage E ₁ corresponding to the voltage of the main power supply 13 is applied to the electromagnetic coil 2a as shown in FIG. 5, application of the charged voltage E ₁ As a result, the switch 2 is turned on at t2 with the main circuit contact 2b closed.
[0013]
The auxiliary contact 2c of the switch 2 is closed in conjunction with the closing of the main circuit contact 2b, and a contact signal for closing the contact 2c is supplied to the input interface 1d as a closing completion signal of the switch 2. .
[0014]
When the control unit 1 confirms the introduction of switch 2 With the introduction completion signal, the process proceeds to the holding voltage control in step S ₅ of FIG. 4, a pulse signal from a continuous on signal to the signal supplied to the light emitting diodes 4a Then, the control signal S1 at the base of the transistor 12 is switched to a periodic pulse signal.
[0015]
By this signal switching, the transistor 12 shifts from continuous ON to switching, and the main power supply 13 is turned on and off by this switching.
[0016]
Further, the pulse output of the emitter of the transistor 12 caused by the interruption is smoothed by the reactor 15 and the capacitor 17, and the energy of the reactor 15 is released via the flywheel diode 22 during the off period of the transistor 12, so that the switch 2 , A DC power supply reduced to a holding voltage E ₂ (≪E ₁ ) of, for example, 24 V necessary for maintaining the turned-on state.
[0017]
Then, by the DC power supply of the holding voltage E _2, decompressed switch 2 is electrically charged state applied voltage to the holding voltage E ₂ from the input voltage E ₁ of which the electromagnetic coil 2a kept transistor 16 is in the ON state Is held.
[0018]
Next, the opening operation to t3, is in operation switch 3 made pressed, the "OFF" command contact signal of the switch 3 is applied to the input interface 1d, the control unit 1 is affirmative step S ₆ in FIG. 4 in through shifts to open control step S _7.
[0019]
When the open control is performed, the control unit 1 immediately stops the supply of the ON signal to the light emitting diode 4a, turns off the transistors 4b and 9, fixes the control signal S1 at the off level, and turns off the transistor 12.
[0020]
When the transistor 12 is turned off, the voltage applied to the electromagnetic coil 2a decreases with a time constant based on the reactor 15, the capacitor 17, the resistor 23, and the like and disappears, the main circuit contact 2b opens, and the switch 2 opens. .
[0021]
When the transistor 12 is turned off, the electric charge of the capacitor 20 is discharged with a time constant based on the capacitor 20, the resistors 21 and 24, etc., and after a certain time period, the transistor 16 is turned off to open the current path of the electromagnetic coil 2a. 2, the opening time limit is regulated.
[0022]
Further, when the switch 2 is opened, the auxiliary contact 2c is opened in conjunction with the opening of the main circuit contact 2b, and a contact signal for opening the contact 2c is supplied to the input interface 1d as an opening completion signal of the switch 2. .
[0023]
Since normally the "OFF""ON" command is not generated immediately after the occurrence of the command, the control unit 1 proceeds to step S ₉ through a negative step S ₈ of FIG. 4, the this step S ₉ When the opening completion signal to confirm the opening of the switch 2, the flow returns to the command wait step S _1.
In FIG. 1, reference numerals 25 to 27 denote diodes used for preventing reverse surge and the like, and reference numeral 28 denotes a current limiting resistor.
[0024]
[Problems to be solved by the invention]
In the case of the above-mentioned conventional switch control device, when the opening control of the switch 2 is generated by the "off" command, the transistor 12 is immediately turned off and the energization of the electromagnetic coil 2a is stopped. opening control of the switch 2 is generated by the "oFF" command to the tx during supply period of t1~t2 of Figure 5 which control is performed, the opening control in step S ₇ through a positive step S ₃ in Fig. 4 shifts when the transistor 12 is turned off, because the voltage applied just before the electromagnetic coil 2a is large charged voltage E _1, excessive opening surge based on stored energy, such as electromagnetic coil 2a is generated, the surge As a result, there is a problem that the transistors 12, 16 and the like are damaged and the reliability cannot be improved.
[0025]
SUMMARY OF THE INVENTION It is an object of the present invention to prevent the occurrence of an excessive reverse surge due to the stoppage of the control of the closing voltage when the opening control occurs during the closing of the switch of the DC electric holding type.
[0026]
[Means for Solving the Problems]
In order to achieve the above object, in the switching control device of the present invention, the control unit includes a control switching unit that immediately switches from the closing voltage control to the emergency opening control by the occurrence of the opening control of the switch during the closing voltage control. Opening control means for switching the semiconductor switch element for a predetermined period by emergency opening control to reduce the voltage applied to the electromagnetic coil of the switch to substantially the holding voltage, and then turning off the semiconductor switch element to open the switch. .
[0027]
[Action]
In the case of the switch control device of the present invention configured as described above, when opening control occurs during closing of the switch in which closing voltage is applied to the electromagnetic coil of the switch by closing voltage control, the control switching means immediately The control is switched from the closing voltage control to the emergency release control.
[0028]
When switching to the emergency opening control, the opening control means switches the semiconductor switching element for a predetermined period to reduce the voltage applied to the electromagnetic coil to substantially the holding voltage, and then turns off the semiconductor switching element to supply power to the electromagnetic coil. Stop and open the switch.
[0029]
Therefore, when the semiconductor switch element is turned off and the switch is opened, the voltage applied to the electromagnetic coil immediately before the switch is sufficiently lower than the applied voltage, and the occurrence of the conventional excessive reverse surge is prevented.
[0030]
【Example】
One embodiment will be described with reference to FIGS.
In FIG. 1, the difference from the conventional device is that the switching control program held in the ROM 1b of the control unit 1 is changed, and the control unit 1 is supplied with the switching voltage immediately by the occurrence of the switching control of the switch 2 during the switching voltage control. and control switching means for switching the emergency release control from the control, the emergency release control, turning off the transistor 12 after depressurizing the voltage applied to the electromagnetic coil 2a to approximately hold voltage E ₂ by switching the transistor 12 as a predetermined time period a semiconductor switching element And the opening control means for opening the switch 2.
[0031]
Then, when triggered by power supply, the control unit 1 executes an open / close control program for the ROM 1b.
This program is formed by the step S1~S11 in Figure 2, typically, in step S1~S9 corresponding to step _S 1 to S ₉ in FIG. 4, a conventional apparatus similar to put the voltage control, the holding voltage control, opening control Execute
[0032]
Next, a case will be described in which the opening control based on the “OFF” command occurs while the switch 2 is being turned on.
First, when the closing operation is performed at t1 as in the conventional apparatus, the control unit 1 shifts to the closing voltage control in step S2 in FIG. 2 based on the operation signal of the “ON” command of the switch 3, and turns on the ON shown in FIG. The transistor 12 is continuously turned on by the level control signal S1.
[0033]
Further, the transistor 16 is turned on by the on-level control signal S2 shown in FIG.
Then, tx of FIG. 3 in the switch 2 is turned on the transistor 12 and 15 turned voltage E ₁ to the electromagnetic coil 2a is turned on is applied, the operation signal "OFF" command switch 3 is generated, the control By the switching means, the control unit 1 immediately switches from the closing voltage control to the emergency release control, passes step S3 of FIG. 2 in the affirmative, and proceeds to step S10.
[0034]
At this time, the control unit 1 changes the signal supplied to the light emitting diode 4a to the holding pulse signal by the emergency opening control of the opening control unit, as in the case of the holding voltage control, and changes the control signal S1 to the period as shown in FIG. The transistor 12 is switched by switching to a typical pulse signal.
[0035]
Then, step S10, pre-reduced voltage period T _{0 (a} predetermined period) is continued with setting the switching transistor 12 by S11 in the timer operation, almost to the holding voltage E ₂ as shown the voltage applied to the electromagnetic coil 2a in Figure 3 Reduce pressure.
[0036]
Incidentally, reduced voltage period T _0, the DC resistance component of the electromagnetic coil 2a, Rd the reactance component, when Lx, is obtained and set from the equation discharge characteristics of the number of the next 1.
[0037]
(Equation 1)

[0038]
Then, at ty of 3 with the passage of reduced voltage period T _0, the process proceeds to step S7 through the step S11 in the affirmative, as in the case of normal opening control, keeping the control signal S1 to the OFF level The transistor 12 is turned off, the voltage applied to the electromagnetic coil 2a disappears, and the switch 2 is opened.
[0039]
Therefore, when opening the switch 2 in the up, become sufficiently low holding voltage E about ₂ than the applied voltage is turned voltage E ₁ of the electromagnetic coil 2a, the occurrence of an excessive opening surges, such as in the conventional apparatus This prevents the peripheral circuit components such as the transistors 12 and 16 from being damaged by the open surge, thereby improving the reliability.
[0040]
The pulse period of the control signal S1 of reduced voltage period T _0, instead of setting a fixed period as the embodiments may be varied to the long period with time, applied in this case electromagnetic coil 2a As shown by the broken line (1) in FIG. 3, the voltage decreases and changes more smoothly than in the case of the constant period of the solid line (2), and damage prevention and the like can be performed more effectively.
[0041]
Further, in the above-described embodiment, the semiconductor switch element is formed by a transistor. However, it is needless to say that the present invention can be applied to a case where the semiconductor switch element is a thyristor or the like.
[0042]
Next, in the above-described embodiment, the switching of the transistor 16 is controlled by so-called self-bias control by charging and discharging the capacitor 20 based on the main power supply via the transistor 12. For example, a control signal is transmitted from the control unit 1 to the base of the transistor 16. It may be supplied to control the switching of the transistor 16.
In order to simplify the configuration, the transistor 16 may be omitted.
[0043]
Next, in the above-described embodiment, the control unit 1 is formed by a microcomputer, and the switch 2 is controlled to open and close by so-called software processing. For example, the control unit 1 is formed by a gate circuit, a timer circuit, and the like. The switching of the switch 2 may be controlled by hardware processing.
[0044]
The configuration of the smoothing filter 14 and the like is not limited to the embodiment.
Then, can be applied to the control of the various switches of the DC electric-held is of course, in this case, the voltage of the main power supply 13, the voltage reduction period T ₀ and the like may be set according to the characteristics of the switch .
[0045]
【The invention's effect】
The present invention is configured as described above, and has the following effects.
When the closing voltage is applied to the electromagnetic coil 2a of the switch 2 according to the closing voltage control of the control unit 1 and the opening control occurs during closing of the switch 2, the control switching unit immediately switches from the closing voltage control to the emergency opening control. Instead, after switching the semiconductor switch element (transistor 12) for a predetermined period of time by the opening control means to reduce the voltage applied to the electromagnetic coil 2a to substantially the holding voltage, the semiconductor switch element is turned off and the power supply to the electromagnetic coil 2a is stopped. Since the switch 2 is opened, the applied voltage of the electromagnetic coil 2a immediately before the semiconductor switch element is turned off and the switch 2 is opened is reduced from the applied voltage to almost the holding voltage, and the excessive reverse surge caused by the conventional applied voltage is reduced. Generation is prevented, and damage to peripheral components due to the reverse surge is prevented, thereby improving reliability.
[Brief description of the drawings]
FIG. 1 is a connection diagram of a switch control device according to an embodiment of the present invention.
FIG. 2 is a flowchart for explaining the operation of a control unit in FIG. 1;
FIG. 3 is a timing chart for explaining the operation of FIG. 1;
FIG. 4 is a flowchart for explaining the operation of a control unit of the conventional device.
FIG. 5 is a timing chart for explaining the operation of the conventional device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Control part 2 Switch 2a Electromagnetic coil 12 Transistor 14 as a semiconductor switch element Smoothing filter

Claims (1)

A semiconductor switch element that is provided between a DC power supply and an electromagnetic coil of a DC electric holding switch and that interrupts the DC power supply by driving control of a control unit; And a smoothing filter for supplying
When the switch is turned on, the semiconductor switch element is continuously turned on to apply a turn-on voltage to the electromagnetic coil by turning-on voltage control of the control unit,
After closing the switch, the control unit switches from the closing voltage control to the holding voltage control,
By the holding voltage control, the semiconductor switch element is switched to reduce the voltage applied to the electromagnetic coil to a holding voltage,
A switch control device that closes and holds the switch by applying the holding voltage to the electromagnetic coil until open control of the switch occurs,
In the control unit,
Control switching means for immediately switching from the closing voltage control to the emergency opening control upon occurrence of the opening control of the switch during the closing voltage control,
Opening control means for switching the semiconductor switch element for a predetermined period of time to reduce the voltage applied to the electromagnetic coil to substantially the holding voltage and then turning off the semiconductor switch element to open the switch by the emergency opening control. Switchgear control device provided.

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