JPH0346233Y2

JPH0346233Y2 -

Info

Publication number: JPH0346233Y2
Application number: JP13279680U
Authority: JP
Priority date: 1980-09-17
Filing date: 1980-09-17
Publication date: 1991-09-30
Also published as: JPS5754681U

Description

【考案の詳細な説明】本考案は電磁ポンプのスロースタート回路に関
するものである。[Detailed Description of the Invention] The present invention relates to a slow start circuit for an electromagnetic pump.

従来の電磁ポンプを用いた給湯機においては、
着火時の音が非常に大きい。その原因は、第１図
の如く、電源１と電磁ポンプ２とダイオード３の
閉回路からなつており、従つてスイツチ４を閉じ
ると、電磁ポンプは即座に動作しはじめ、瞬間的
に規定の油噴霧圧力になるために、油の流量も最
も最初から多くなり、着火時に大きな音となつ
た。このような着火時の音を低くするために、着
火時には、油噴霧の圧力を低くおさえ、着火させ
その後、徐々に圧力を上昇させ規定の圧力にする
事が目的である。 In water heaters using conventional electromagnetic pumps,
The sound when ignited is very loud. The cause of this is, as shown in Figure 1, a closed circuit consisting of a power supply 1, an electromagnetic pump 2, and a diode 3. Therefore, when the switch 4 is closed, the electromagnetic pump immediately begins to operate, instantly discharging the specified amount of oil. Due to the spray pressure, the oil flow rate also increased from the very beginning, making a loud noise when ignited. In order to reduce the noise during ignition, the purpose is to keep the pressure of the oil spray low during ignition, and after ignition, gradually increase the pressure to a specified pressure.

本考案は、着火時はポンプの吐出圧力を低くし
ておき、これを徐々に高くするために、電磁ポン
プと直列にしたサイリスタの導通角を徐々に大き
くするものである。 In the present invention, the discharge pressure of the pump is kept low at the time of ignition, and in order to gradually increase the discharge pressure, the conduction angle of the thyristor connected in series with the electromagnetic pump is gradually increased.

第２図は、本考案の実施例の回路図である。即
ち、電源１、電磁ポンプ２、サイリスタ３及びス
イツチ４は閉回路をなしている。スイツチ４とポ
ンプ２の接続点ａ点より、抵抗５は、ｂ点でゼナ
ーダイオード６のカソード側で接続されており、
そのアノード側は、前記サイリスタ３のカソード
と電源１の接続点ｃ点に接続されている。ｂ点か
らは、ｂ点をアノードとしたダイオード７を、そ
のカソード側には容量の大きいコンデンサ８を接
続し、その接続点をｆ点とする。コンデンサ８か
ら接続点ｄ点とｃ点側に抵抗９を接続する。また
ｂ点からはｂ点をアノードとする第２のダイオー
ド１０を、そのカソード側には抵抗１１を接続し
容量の小さいコンデンサ１２をｃ点側と抵抗１１
との間に接続しその接続点をｅ点とする。 FIG. 2 is a circuit diagram of an embodiment of the present invention. That is, the power source 1, electromagnetic pump 2, thyristor 3, and switch 4 form a closed circuit. From the connection point a of the switch 4 and the pump 2, the resistor 5 is connected to the cathode side of the zener diode 6 at the point b.
Its anode side is connected to a connection point c between the cathode of the thyristor 3 and the power source 1. From point b, a diode 7 with the anode at point b is connected to the cathode side of the diode 7, and a capacitor 8 with a large capacity is connected to the cathode side, and the connection point is defined as point f. A resistor 9 is connected from the capacitor 8 to the connection points d and c. Also, from point b, connect a second diode 10 with point b as its anode, connect a resistor 11 to its cathode side, connect a capacitor 12 with a small capacitance to point c side, and connect resistor 11 to its cathode side.
and let the connection point be point e.

前記ｄ点ｅ点を比較増幅器（オペアンプ）１５
の入力側に接続し、その出力をサイリスタ３のゲ
ートに接続する。なおダイオード７のカソードｆ
点とｃ点にはｆ−ｃ間の電圧を平滑にするコンデ
ンサ１３を接続する。 A comparison amplifier (op-amp) 15 compares the point d and the point e.
and its output is connected to the gate of thyristor 3. Note that the cathode f of diode 7
A capacitor 13 is connected between points f and c to smooth the voltage between f and c.

また、コンデンサ１２の放電回路として、ダイ
オード１４をダイオード１０と極性が異なるよう
に抵抗１１と直列にｂ−ｅ間に接続する。オペア
ンプ１５の電源は、ダイオード７のカソード側に
正の電源端子、ｃ点に負側電源端子を接続する。 Further, as a discharge circuit for the capacitor 12, a diode 14 is connected in series with the resistor 11 between be and e so that the polarity is different from that of the diode 10. The power supply for the operational amplifier 15 is connected to a positive power terminal on the cathode side of the diode 7 and a negative power terminal to the point c.

本考案の動作は、スイツチ４を閉じると、交流
電源１は抵抗５及びポンプ２に印加される。この
ため、コンデンサ１３は抵抗５とダイオード７と
により、１サイクルで充電されて、ゼナーダイオ
ード６の両端の電圧Vzと同じ電圧になる。 The operation of the present invention is such that when the switch 4 is closed, the AC power source 1 is applied to the resistor 5 and the pump 2. Therefore, the capacitor 13 is charged by the resistor 5 and the diode 7 in one cycle, and becomes the same voltage as the voltage Vz across the Zener diode 6.

第３図は、コンデンサ１３の電圧が一定になつ
てからの特性を示している。一方、コンデンサ８
は容量が大きいので、すぐには充電されず、その
ため、ｄ点は最初はｂ点と同じ電圧であるが、
徐々に抵抗９を通つて充電されるためにｄ点の電
位は降下する。 FIG. 3 shows the characteristics after the voltage of the capacitor 13 becomes constant. On the other hand, capacitor 8
Since has a large capacity, it is not charged immediately, so point d initially has the same voltage as point b, but
Since it is gradually charged through the resistor 9, the potential at point d drops.

その様子が第３図の１点鎖線C₈の如くであり、
抵抗９の両端の電圧である。 The situation is shown in the dashed line _C8 in Figure 3.
This is the voltage across the resistor 9.

この降下特性は、数秒かかつてゼナーダイオー
ド６の電圧VzよりOVになるまで続く。すなわち
この時間がスロースタートの時間となる。 This drop characteristic continues for several seconds or until the voltage of the Zener diode 6 becomes OV below Vz. In other words, this time becomes the slow start time.

次に、ゼナーダイオード６の両端の電圧は、電
源回路ａ側がのときは、抵抗５→ｂ点→ゼナー
ダイオード６→ｃ点と電流が流れるため、ゼナー
ダイオード６の両端はゼナーダイオード固有のゼ
ナー電圧となる。次にｃ側がのときにはゼナー
ダイオード６はシヨートになるので、その両端に
は全く電圧が発生せず、OVとなる。この様子は
第３図のVzのような台形とOVが交互に組み合わ
さつた波形となる。 Next, when the voltage across the zener diode 6 is on the power supply circuit a side, a current flows from the resistor 5 → point b → zener diode 6 → point c, so both ends of the zener diode 6 are connected to the zener diode. It becomes a unique zener voltage. Next, when the c side is , the zener diode 6 becomes short, so no voltage is generated across it, resulting in OV. This situation results in a waveform in which trapezoids and OV are alternately combined like Vz in Figure 3.

ゼナーダイオード６の両端の台形の電圧が発生
すると、コンデンサ１２にはダイオード１０→抵
抗１１→ｅ点と充電され、その波形は第３図の
C₁₂の２点鎖線のように、ａ点側がになつてか
ら上昇するような波形になる。 When a trapezoidal voltage is generated across the Zener diode 6, the capacitor 12 is charged from the diode 10 to the resistor 11 to point e, and its waveform is shown in FIG.
As shown by the two-dot chain line of C ₁₂ , the waveform becomes such that the point a side becomes , and then rises.

以上のようにコンデンサ１２の充電特性は交流
電源１の１サイクルの間のａ点側が正のときは充
電波形となりｃ点側が正のときはOVをノコギリ
波のような形となる。 As described above, the charging characteristic of the capacitor 12 is such that when the point a is positive during one cycle of the AC power source 1, the charging waveform is positive, and when the point c is positive, the OV is in the form of a sawtooth wave.

この電圧が１点鎖線のC₈の波形と一致し、そ
れより電圧が高くなつたときに、オペアンプ１５
は出力高になるため、サイリスタ３はターンオン
する。そしてポンプ２がONする。このときには
C₈の特性がまだ高いために、第１のパルスの終
り頃であり小さな波形Vp₁となる。次にｃ側が
になるとダイオード１４のためにコンデンサ１２
の電荷は放電され、その両端ｅ−ｃ間はOVにな
る。そして第２のパルスのときは、もう一度ゼナ
ーダイオード６の両端に電圧が加わり、コンデン
サ１２に再び充電が開始される。ｅ点電位が上昇
して、コンデンサ８の端子ｄ点はさらに降下して
いるので、前回より速めにオペアンプ１５は出力
を出す。 When this voltage matches the waveform of _C8 shown by the dashed dotted line and the voltage becomes higher than that, the operational amplifier 15
Since the output becomes high, the thyristor 3 is turned on. Then pump 2 turns on. At this time
Since the characteristic of C ₈ is still high, a small waveform Vp ₁ occurs near the end of the first pulse. Next, when the c side becomes, the capacitor 12 is connected to the diode 14.
The charge is discharged, and the voltage between both ends e and c becomes OV. Then, at the time of the second pulse, voltage is once again applied across the Zener diode 6, and charging of the capacitor 12 is started again. Since the potential at the point e has increased and the potential at the terminal d of the capacitor 8 has further fallen, the operational amplifier 15 outputs an output faster than the previous time.

よつてサイリスタ３の導通角は大きくなり、ポ
ンプの波形Vp₂はVp₁より大きくなる。 Therefore, the conduction angle of the thyristor 3 becomes large, and the pump waveform Vp ₂ becomes larger than Vp ₁ .

さらに第３パルスのように、特性C₈がさらに
降下すると、特性C₁₂との交点t₃は大きくなり、
従つて導通角はVp₃のように大きくなり、電磁ポ
ンプに大きな電圧が印加される。 Furthermore, as in the third pulse, when the characteristic C ₈ falls further, the intersection point t ₃ with the characteristic C ₁₂ becomes larger,
Therefore, the conduction angle becomes large, such as Vp ₃ , and a large voltage is applied to the electromagnetic pump.

以上の如く、コンデンサ８と抵抗９のラインは
スロースタートの開始から終了までの時間を決定
するものであり、抵抗１１のコンデンサ１２のラ
インは、スロースタート開始時のポンプの吐出圧
力の大きさを決定するものである。 As mentioned above, the line between the capacitor 8 and the resistor 9 determines the time from the start to the end of the slow start, and the line between the resistor 11 and the capacitor 12 determines the magnitude of the pump discharge pressure at the start of the slow start. It is up to you to decide.

以上説明したように本考案によれば次のような
効果が期待できる。 As explained above, according to the present invention, the following effects can be expected.

１本考案の如く、ポンプが初期一定時間、低い
吐出圧力のため、着火時の着火音が非常に低く
なるため使用環境へ与える影響が少なくなる。1. As in the present invention, since the pump has a low discharge pressure for an initial period of time, the ignition noise at the time of ignition is very low, so the impact on the usage environment is reduced.

２ポンプの吐出圧力が着火時に低いので、油の
流速も低く従つて着火性がよくなる。2. Since the discharge pressure of the pump is low at the time of ignition, the flow rate of oil is also low, which improves ignition performance.

３本考案の回路では、ゼナー電圧でカツトして
いるため、電源電圧の影響が殆んどない。3 In the circuit of the present invention, there is almost no influence from the power supply voltage because the voltage is cut off by the zener voltage.

４欠点としては、50Hzと60Hzとでパルスの巾が
異なるため、スタート時点での吐出圧力が異な
ることはあるが、これを50Hzと60Hzの中間をと
つておけば、さほど問題になるようなことはな
い。4. The disadvantage is that the pulse width is different between 50Hz and 60Hz, so the discharge pressure at the start may be different, but if you set this to the middle between 50Hz and 60Hz, this will not be a problem. There isn't.

[Brief explanation of the drawing]

第１図は従来例を示す回路図、第２図は本考案
の一実施例を示す回路図、第３図は同動作説明図
である。１……電源、２……電磁ポンプ、３……サイリ
スタ、４……スイツチ、６……ゼナーダイオー
ド、１３……コンデンサ、１５……比較増巾器。 FIG. 1 is a circuit diagram showing a conventional example, FIG. 2 is a circuit diagram showing an embodiment of the present invention, and FIG. 3 is an explanatory diagram of the same operation. 1... Power source, 2... Electromagnetic pump, 3... Thyristor, 4... Switch, 6... Zener diode, 13... Capacitor, 15... Comparison amplifier.

Claims

[Scope of utility model registration request]

A closed circuit consisting of an AC power source, a first resistor, and a Zener diode is constructed, and a first diode with a polarity different from that of the Zener diode, a second resistor, and a first capacitor are connected to both ends of the Zener diode. connecting a series circuit connected at a point, and connecting a second diode having a polarity opposite to that of the first diode in parallel to the series circuit of the first diode and the second resistor;
The charging rate of the first capacitor is set to a constant so that it is charged within a half cycle of the AC power supply, and a third diode and a second capacitor are connected in parallel with the Zener diode and have opposite polarity. A series circuit is provided in which smoothing capacitors are connected in series, and a third capacitor with a large capacity and a third resistor are connected in parallel with the second capacitor at point d, and the charging speed of the third capacitor is Select a constant that takes several seconds, use the points e and d as inputs of a comparator amplifier, configure a closed circuit with the AC power supply, electromagnetic pump, and thyristor, and connect the output of the comparator amplifier to the gate of the thyristor. A slow start circuit for an electromagnetic pump.