JPH0250717B2 - - Google Patents
Info
- Publication number
- JPH0250717B2 JPH0250717B2 JP57092607A JP9260782A JPH0250717B2 JP H0250717 B2 JPH0250717 B2 JP H0250717B2 JP 57092607 A JP57092607 A JP 57092607A JP 9260782 A JP9260782 A JP 9260782A JP H0250717 B2 JPH0250717 B2 JP H0250717B2
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- voltage
- current
- output
- commutation failure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000006243 chemical reaction Methods 0.000 claims description 12
- 238000001514 detection method Methods 0.000 claims description 11
- 238000010438 heat treatment Methods 0.000 claims description 2
- 230000006698 induction Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 5
- 230000007423 decrease Effects 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/505—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means
- H02M7/515—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means using semiconductor devices only
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Description
【発明の詳細な説明】
本発明は、直流出力電圧の制御が可能な順変換
部の出力を受けて逆変換動作を行う誘導加熱用電
流形高周波インバータ装置、特にその転流失敗検
出回路に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a current-source high-frequency inverter device for induction heating that performs a reverse conversion operation upon receiving the output of a forward conversion unit capable of controlling a DC output voltage, and particularly to a commutation failure detection circuit thereof. It is.
負荷にＬ，Ｃ共振回路を有する電流形高周波イ
ンバータの主回路構成を第１図に示す。図におい
て、１はサイリスタの純ブリツジ回路を用いた順
変換部、２はこの順変換路１の出力端間に接続し
たダイオード、３は直流リアクトル、４は始動回
路、５は逆変換部で、ブリツジ接続したサイリス
タ５ａ〜５ｄからなる。６は負荷で、リアクトル
６ａとコンデンサ６ｂの並列回路（Ｌ，Ｃ共振回
路）を有する。７はインバータ部（逆変換部）５
の入力電圧、つまり端子P1，Ｎ間の電圧VINを
入力とする単相整流回路、８はこの単相整流回路
７の出力端間に発光部を接続したフオトカプラ
で、この受光部が電源（＋15V）に接続されると
ともに、転流失敗検出信号出力端に接続される。
即ち、電圧VCFが零か、（＋）15Vかによつて転
流の正否が検出される。 Figure 1 shows the main circuit configuration of a current source high frequency inverter with L and C resonant circuits in the load. In the figure, 1 is a forward conversion section using a pure bridge circuit of a thyristor, 2 is a diode connected between the output ends of this forward conversion path 1, 3 is a DC reactor, 4 is a starting circuit, and 5 is an inverse conversion section. It consists of bridge-connected thyristors 5a to 5d. 6 is a load, which has a parallel circuit (L, C resonant circuit) of a reactor 6a and a capacitor 6b. 7 is an inverter section (inverse conversion section) 5
A single-phase rectifier circuit that receives the input voltage of , that is, the voltage VIN between terminals P 1 and N, 8 is a photocoupler with a light-emitting part connected between the output terminals of this single-phase rectifier circuit 7, and this light-receiving part is connected to the power supply ( +15V) and the commutation failure detection signal output terminal.
That is, whether the commutation is correct or not is detected depending on whether the voltage VCF is zero or (+)15V.
このように電流形高周波インバータには端子
P1，Ｎ間の電圧が零になつたことをもつて転流
失敗と判断する回路が逆変換部５の保護機能の一
つとして付加されており、転流失敗検出時には逆
変換動作を停止させている。 In this way, current source high frequency inverters have terminals.
A circuit that determines commutation failure when the voltage between P 1 and N becomes zero is added as one of the protection functions of the inverse converter 5, and stops the inverse conversion operation when a commutation failure is detected. I'm letting you do it.
しかしながら、上記のような回路構成では始動
時あるいは低出力時に問題がある。この点を第２
図の波形図を参照しながら説明する。始動時ある
いは低出力時には順変換部１の出力、つまり端子
Ｐ，Ｎ間の電圧VDC、電圧VCF、電圧VIV、インバ
ータ出力電圧VL及び負荷電流ILは第２図に示すよ
うな波形となり、電圧VDCは零Vの期間が生じる。
この期間、逆変換部５のサイリスタ５ａ〜５ｄに
ゲート信号を加えても、VDC＝０なので、負荷電
流ILは減少していき、遂には途切れて電流が零の
期間T1が発生する。この期間はVDC＝VIC＝０で
あり、転流失敗と判断され、逆変換動作が停止さ
れる。即ち、直流電流が断続する状態は転流失敗
と誤まつて判断されることになり、始動時あるい
は低出力時には動作が不安定となる。 However, the above-described circuit configuration has problems at startup or at low output. This is the second point.
This will be explained with reference to the waveform diagram in the figure. At startup or at low output, the output of the forward converter 1, that is, the voltage V DC between terminals P and N, the voltage VCF , the voltage V IV , the inverter output voltage V L , and the load current I L have waveforms as shown in Figure 2. Therefore, a period in which the voltage V DC is 0 V occurs.
During this period, even if a gate signal is applied to the thyristors 5a to 5d of the inverse converter 5, since V DC = 0, the load current I L decreases, and finally stops, and a period T 1 in which the current is zero occurs. . During this period, V DC =V IC =0, it is determined that commutation has failed, and the inverse conversion operation is stopped. That is, a state in which the DC current is intermittent is mistakenly determined to be a commutation failure, and the operation becomes unstable at startup or at low output.
なお、電流の途切れを防止するには直流リアク
トルのリアクタンスを大きくすればよいが、不経
済になる。 Note that in order to prevent interruption of the current, it is possible to increase the reactance of the DC reactor, but this becomes uneconomical.
本発明は上記のような問題点を解消するために
なされたもので、直流電流が断続する期間は、負
荷回路の自由共振電圧をP1−Ｎ間に供給し、P1
−Ｎ間が短絡状態になつたときのみ転流失敗と判
断する回路構成とすることによつて、始動時ある
いは低出力時にも正確に転流失敗を検出すること
ができ、常時安定運転が可能な電流形高周波イン
バータ装置を提供することを目的とする。以下、
本発明を第３図の実施例に基づいて詳細に説明す
る。 The present invention has been made to solve the above-mentioned problems, and during the period when the DC current is intermittent, the free resonance voltage of the load circuit is supplied between P 1 and N.
By configuring the circuit to determine commutation failure only when -N is short-circuited, commutation failure can be accurately detected even during startup or low output, allowing stable operation at all times. The purpose of the present invention is to provide a current-source high-frequency inverter device. below,
The present invention will be explained in detail based on the embodiment shown in FIG.
第３図は本発明の一実施例を示すもので、第１
図と同一構成部分には同一符号を付している。単
相整流回路７の入力端を検出抵抗９を介して端子
P1，Ｎに接続することは本実施例でも同様であ
るが、インバータ出力電圧VLを検出する変圧器
１１を設け、その出力を整流回路１２で整流した
後、限流抵抗１３及び検出抵抗９を介して単相整
流回路７の入力端に加えている。即ち、本実施例
では直流電流が断続する期間、負荷の自由共振電
圧をP1−Ｎ間に供給し、P1−Ｎ間が短絡状態に
なつたときのみを転流失敗と判断して転流失敗検
出信号を発生する回路構成としている。 FIG. 3 shows one embodiment of the present invention.
Components that are the same as those in the figures are given the same reference numerals. The input end of the single-phase rectifier circuit 7 is connected to the terminal via the detection resistor 9.
The connections to P 1 and N are the same in this embodiment, but a transformer 11 is provided to detect the inverter output voltage V L , and after the output is rectified by a rectifier circuit 12, a current limiting resistor 13 and a detection resistor are connected. 9 to the input terminal of the single-phase rectifier circuit 7. That is, in this embodiment, the free resonant voltage of the load is supplied between P 1 and N during the period when the DC current is intermittent, and commutation is determined to have failed only when P 1 and N become short-circuited. The circuit is configured to generate a flow failure detection signal.
次に、動作について述べる。始動時あるいは低
出力時には第４図に示すように順変換部１の出力
電圧VDCが断続するようになり、電流ILが途切れ
る。このとき、インバータ出力電圧VLは自由振
動を続けており、この電圧が変圧器１１で低電圧
に変圧され、整流回路１２で整流された後、抵抗
１３及び９を介して整流回路７の入力端に加わ
る。この電圧は端子P1，Ｎ間にも加わることに
なり、電流ILが途切れる期間T2は、電圧VIV波形
は第４図に示すように電圧VLの全波整流波形と
なる。従つて、電圧VCFはT2期間でも論理レベル
「１」（＋15）となることなく、零（Ｖ）に維持さ
れる。即ち、直流電流がが断続しても、転流失敗
であると誤検出されるおそれがなくなる。 Next, the operation will be described. At the time of starting or at low output, the output voltage V DC of the forward converter 1 becomes intermittent as shown in FIG. 4, and the current I L is interrupted. At this time, the inverter output voltage V L continues to freely oscillate, and this voltage is transformed to a low voltage by the transformer 11, rectified by the rectifier circuit 12, and then input to the rectifier circuit 7 via resistors 13 and 9. Add to the edge. This voltage is also applied between the terminals P 1 and N, and during the period T 2 in which the current I L is interrupted, the voltage V IV waveform becomes a full-wave rectified waveform of the voltage V L as shown in FIG. Therefore, the voltage V CF does not reach the logic level "1" (+15) even during the T 2 period and is maintained at zero (V). That is, even if the DC current is intermittent, there is no possibility that commutation failure will be erroneously detected.
一方、実際に転流失敗が生じた場合には、第５
図に示すように電圧VLが急速に低減して消失す
る形で自由振動したとしても、転流失敗によつて
端子P1，Ｎ間が短絡状態となるので、入力電圧
VIVが零となる。この結果、フオトカプラ８の出
力端電圧VCFが（＋）15V、つまりレベル「１」
となり、転流失敗検出信号が発生する。 On the other hand, if a commutation failure actually occurs, the fifth
As shown in the figure, even if the voltage V L oscillates freely in such a way that it rapidly decreases and disappears, the commutation failure causes a short circuit between terminals P 1 and N, so the input voltage
V IV becomes zero. As a result, the output terminal voltage V CF of photocoupler 8 is (+)15V, that is, level "1".
As a result, a commutation failure detection signal is generated.
以上のように本発明によれば、始動時、低出力
時に直流電流が断続することによつて生じるイン
バータ入力電圧・零と実際の転流失敗によつて生
じる入力電圧零とが区別されるようになり、直流
電流の断続が発生しても安定な運転が行われる。
また、電流の途切れをなくすようなるべく大きな
リアクタンス値としていた直流リアクトルは小形
のものですむようになり、小形化・低廉化が図れ
る。 As described above, according to the present invention, it is possible to distinguish between the inverter input voltage of zero, which occurs due to intermittent DC current during startup or low output, and the input voltage of zero, which occurs due to actual commutation failure. This ensures stable operation even when DC current is interrupted.
In addition, the DC reactor, which had a reactance value as large as possible to eliminate interruptions in current, can now be made smaller, making it possible to reduce the size and cost.
第１図は従来の電流形高周波インバータの回路
図、第２図は同インバータの始動時、低出力時に
おける不安定動作を説明するための波形図、第３
図は本発明の一実施例を示す回路図、第４図及び
第５図は同実施例の動作説明のための波形図であ
る。
１……順変換部、３……直流リアクトル、５…
…逆変換部、５ａ〜５ｄ……サイリスタ、６……
負荷、７……単相整流回路、８……フオトカプ
ラ、９……検出抵抗、１１……変圧器、１２……
整流回路、１３……限流抵抗。
Figure 1 is a circuit diagram of a conventional current-source high-frequency inverter, Figure 2 is a waveform diagram to explain the unstable operation of the same inverter at startup and low output, and Figure 3
The figure is a circuit diagram showing an embodiment of the present invention, and FIGS. 4 and 5 are waveform diagrams for explaining the operation of the embodiment. 1... Forward conversion unit, 3... DC reactor, 5...
...Inverse conversion section, 5a to 5d...Thyristor, 6...
Load, 7...Single-phase rectifier circuit, 8...Photocoupler, 9...Detection resistor, 11...Transformer, 12...
Rectifier circuit, 13... current limiting resistor.
Claims (1)
を受けて逆変換動作を行う誘導加熱用の電流形高
周波インバータ装置において、逆変換部の直流入
力電圧を検出する回路と、インバータ出力電圧を
検出する回路と、前記両検出回路から入力を受
け、両検出回路の出力が共に零のとき転流失敗と
判別して転流失敗検出信号を発生する回路とを備
えた電流形高周波インバータ装置。1 In a current-source high-frequency inverter device for induction heating that performs inverse conversion operation in response to the output of a forward conversion unit that can control the DC output voltage, a circuit that detects the DC input voltage of the inversion unit and a circuit that detects the inverter output voltage are used. A current source high frequency inverter device comprising: a detection circuit; and a circuit that receives input from both of the detection circuits, determines commutation failure when both outputs of both detection circuits are zero, and generates a commutation failure detection signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57092607A JPS58212373A (en) | 1982-05-31 | 1982-05-31 | Current type high frequency inverter device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57092607A JPS58212373A (en) | 1982-05-31 | 1982-05-31 | Current type high frequency inverter device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58212373A JPS58212373A (en) | 1983-12-10 |
| JPH0250717B2 true JPH0250717B2 (en) | 1990-11-05 |
Family
ID=14059124
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57092607A Granted JPS58212373A (en) | 1982-05-31 | 1982-05-31 | Current type high frequency inverter device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58212373A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5629618B2 (en) * | 2011-03-23 | 2014-11-26 | 東芝三菱電機産業システム株式会社 | AC motor control device |
-
1982
- 1982-05-31 JP JP57092607A patent/JPS58212373A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58212373A (en) | 1983-12-10 |
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