CN2109630U - Energy saver for AC contactor, relay and electromagnet - Google Patents

Abstract

The utility model discloses an energy-saving device of AC contactor, relay, electro-magnet, by one-way silicon controlled rectifier, electric capacity, resistance etc. constitute, characterized by D₁Anode connected to T anode, D₁The cathode is connected with one end of RO, the other end of RO is connected with C₁Positive electrode of (2), R₂And D₃Is connected to the positive pole of R₂Another end of (1) and R₁One end of ₃Is connected with the cathode of T, R₁Another end of (1) and C₁Negative electrode and D₂Is connected to the anode D₂The cathode of (2) is connected with the control electrode of T.

Description

Power saving device for ac contactor, relay and electromagnetic iron

The utility model relates to a kind of power electronic circuit, and it has two inputs and two outputs.If with the input termination AC power of this power electronic circuit, with the coil of its output termination A.C. contactor (or relay, electromagnet), coil is energy-conservation when working just to make A.C. contactor (or relay, electromagnet).Furtherly, the utility model relates to a kind of energy-saving appliance of exciting curent being provided for A.C. contactor (or relay, electromagnet).

Widely used A.C. contactor in the industrial production (or relay, electromagnet), the general direct use alternating current of its coil, copper loss, iron loss and reactive loss etc. are bigger during operation, in order to reduce these losses, people have designed the energy-saving appliance that the coil for A.C. contactor (or relay, electromagnet) uses, realize becoming AC coil and be DC operation, thus economize on electricity significantly.The technology of existing this respect is owing to used transformer, or bulky capacitor, or high-power resistance, thus volume is big or circuit in have the element of heating.For example the patent No. is to have used transformer in 89211957.8 the Chinese patent, the patent No. is in 91203365.7 the Chinese patent, relevant power circuit can't use highly sensitive controllable silicon, thereby in the silicon controlled circuits for triggering, can't use the bigger resistance current limliting of resistance, make that this resistance power consumption is big, so not only heating, and the resistance volume of selecting for use is bigger.

The purpose of this utility model is: overcome above-mentioned existing in prior technology deficiency, do not use transformer, do not need in the silicon controlled circuits for triggering, to use high-power resistance by using highly sensitive controllable silicon, make the energy-saving appliance volume of A.C. contactor, relay, electromagnet little, no heater element.

The utility model discloses the energy-saving appliance of a kind of novel A.C. contactor, relay, electromagnet, and it is made of high sensitivity one-way SCR, decompression capacitor, dropping resistor, full-wave rectification bridge and thyristor gating circuit five parts.Decompression capacitor is with in parallel with the high sensitivity one-way SCR again after dropping resistor is connected, the negative electrode of high sensitivity one-way SCR connects an input of full-wave rectification bridge, one end of another input termination AC power of full-wave rectification bridge, the anode of another termination high sensitivity one-way SCR of AC power.When using this energy-saving appliance, two outputs of full-wave rectification bridge are received two terminals of A.C. contactor (or relay, electromagnet) coil respectively.This energy-saving appliance work time-division starts and two stages of sticking, behind power turn-on, thyristor gating circuit provides enough trigger currents for the control utmost point of high sensitivity one-way SCR, make its conducting, AC power is by giving two supplying power for input end of full-wave rectification bridge after the high sensitivity one-way SCR halfwave rectifier like this, two outputs of full-wave rectification bridge give that the coil of A.C. contactor (or relay, electromagnet) provides still is the d. c. voltage signal of AC power through halfwave rectifier, makes A.C. contactor (or relay, electromagnet) adhesive.After guaranteeing reliable startup a period of time, thyristor gating circuit reduces the trigger current that the control utmost point to the high sensitivity one-way SCR provides automatically, make the high sensitivity one-way SCR not trigger and turn-off, so just finished the automatic conversion that starts to the sticking stage.The sticking stage is because the high sensitivity one-way SCR is in off state, AC power will be by could giving full-wave rectification bridge two supplying power for input end after decompression capacitor and the dropping resistor step-down, thereby full-wave rectification bridge two outputs give that the coil of A.C. contactor (or relay, electromagnet) provides can be the lower direct voltage of amplitude.For dropping resistor is not generated heat, therefore its resistance is selected very for a short time, be that voltage drop on the dropping resistor is very little, voltage should fall in large quantities at the decompression capacitor two ends like this, as long as the value of decompression capacitor and dropping resistor is reasonable, just can make sticking in the stage direct current by coil both little of meeting the demands, dropping resistor can not generate heat again.At sticking in the stage, the product of the effective value of AC supply voltage and its output current effective value (being apparent power) when not adding energy-saving appliance below 1/5, promptly energy-saving effect is up to more than 80%.Below in conjunction with accompanying drawing the utility model is described further.

The power electronic circuit shown between a1, a2 two ends and b1, the b2 two ends is circuit theory diagrams of the present utility model among Fig. 1.

V among Fig. 1 represents AC supply voltage, and L represents the coil of A.C. contactor (or relay, electromagnet).

What Fig. 2 represented is after the K switch among Fig. 1 is closed (promptly connecting AC power), the voltage schematic diagram at the coil L two ends among Fig. 1.The startup stage that wherein t1 representing, t2 represents the sticking stage.

Referring to Fig. 1, C2 represents decompression capacitor, and R3 represents dropping resistor, and T represents the high sensitivity one-way SCR, and S represents the full-wave rectification bridge that is made of four diodes of D4～D7. Thyristor gating circuit among the figure is made of diode D1, current-limiting resistance R0, electrochemical capacitor C1, diode D2, Zener diode D3 and two discharge resistance R1, R2. Silicon controlled control circuit connects like this: the anode of D1 connects the anode of T, and the negative electrode of D1 connects the end of R0, and the other end of R0 is connected with the end of the positive pole of C1, R2 and the positive pole of D3, the other end of R2 and the end of R1, the negative pole of D3 and the negative electrode phase of T Connect, the other end of R1 is connected with the anode of the negative pole of C1 and D2, and the negative electrode of D2 connects the control utmost point of T. Before K switch is closed, C1 by with R1, the discharge loop discharge that R2 forms, make the voltage at C1 two ends become 0, after K switch is closed the connection alternating current, a1 is positive a2 when negative, be formed on the loop that the control utmost point of T produces trigger current by negative electrode → D4 of the control utmost point → T of a1 → D1 → R0 → C1 → D2 → T → L → D7 → a2, make the T triggering and conducting, charge to C1 simultaneously, when a1 is timing for negative a2, T ends owing to having added back-pressure, along with the charging of C1, voltage between C1 positive pole and the negative pole is increasing, when this voltage during near the voltage stabilizing value of D3, because the shunting action of D3, even a1 is that positive a2 is for negative, the triggering loop of T can not produce enough trigger currents and make the T conducting in the control extremely of T, be that T ends fully after this, plugged begins to end fully during this period of time for aforesaid the startup stage to T, in this stage, the voltage that is added on the L is the DC voltage of alternating voltage after the T halfwave rectifier, and its waveform is shown in the t1 among Fig. 2. Referring to Fig. 1, after T ended fully, namely sticking was in the stage again, and AC power is by decompression capacitor C2 and dropping resistor R3 step-down, and again through full-wave rectification bridge S, the voltage that is added in the L two ends is the littler full-wave direct current voltage of amplitude, and its waveform is shown in the t2 among Fig. 2. In the course of work of whole circuit, the magnitude of voltage at C1 two ends can not be higher than the voltage stabilizing value of D3, as long as D3 selects the little Zener diode of voltage stabilizing value like this, C1 both end voltage value is just very little, therefore C1 can select the very low electrochemical capacitor of withstand voltage, thereby makes the volume of C1 very little. Because T is highly sensitive controllable silicon, therefore, the conducting trigger current value that needs is very little, and namely the value of R0 can be very big, square is directly proportional according to ohmically power consumption and resistance both end voltage value, and be inversely proportional to this principle as can be known with its resistance, the increase of R0 makes the power consumption on the R0 very little, and namely R0 can select low power resistance, R0 does not only generate heat like this, and volume is little.

Compared with prior art, the advantage of this utility model is: 1, do not use transformer, also do not use the very big capacitor of volume, so that the circuit volume of this energy-saving appliance is little, cost is low. 2, owing to adopt the high sensitivity controllable silicon, so that the current-limiting resistance resistance in the thyristor gating circuit is very greatly and this resistance is not generated heat optional, thereby avoided occurring in the energy-saving appliance element of heating.

Embodiment 1:

See circuit shown in Figure 1, supply voltage V is for exchanging 380V, and L is 40A, and coil voltage is for exchanging the ac contactor coil of 380V.R0：620KΩ／0.25W，R1：10KΩ／0.125W，R2：33KΩ／0.125W，R3：11Ω／0.5W，C1：1μf／16V，C2：0.22μf／630V，D1：IN4006，D2：IN4148，D3：RD2.0E，D4～D7：IN4006，T：FOR3G。

Claims (2)

1, a kind of A.C. contactor, relay, the energy-saving appliance of electromagnet, by one-way SCR T, decompression capacitor C2, dropping resistor R3, full-wave rectification bridge S and thyristor gating circuit five parts constitute, wherein, thyristor gating circuit is by diode D1, current-limiting resistance RO, electrochemical capacitor C1, diode D2, voltage stabilizing didoe D3 and two discharge resistance R1, R2 constitutes, of the present utility model being characterised in that, thyristor gating circuit connects like this: the anode of D1 connects the anode of T, the negative electrode of D1 connects the end of RO, the other end of RO and the positive pole of C1, the end of R2 and the positive pole of D3 are connected, the end of the other end of R2 and R1, the negative pole of D3 is connected with the negative electrode of T, the other end of R1 is connected with the anode of the negative pole of C1 and D2, and the negative electrode of D2 connects the control utmost point of T.

2, the energy-saving appliance of A.C. contactor according to claim 1, relay, electromagnet is characterized in that, one-way SCR T is highly sensitive one-way SCR.