阅读说明：本技术 一种接触器的节电及快速释放控制电路的控制方法 (Control method of power-saving and quick-release control circuit of contactor ) 是由 李新文 周学 彭体康 杨文英 于 2019-09-26 设计创作，主要内容包括：本发明提出一种接触器的节电及快速释放控制电路的控制方法,接触器控制器在上电时直接将用户控制电压整流后加载在线圈上,延时后等接触器完全吸合再用电子开关将线圈切到低压隔离电源供电,实现节电保持；掉电时通过继电器切断保持电路,切断线圈续流回路,实现快速释放。本发明提出一种接触器的节电及快速释放控制电路的控制方法可以适用于交流供电型、直流供电型及交直流通用接触器,降低其线圈发热,从而降低能耗与温升。(The invention provides a control method of a power-saving and quick-release control circuit of a contactor, wherein a contactor controller directly rectifies user control voltage and then loads the rectified voltage on a coil when the contactor is powered on, and after time delay, the contactor is completely closed, and then an electronic switch is used for switching the coil to a low-voltage isolation power supply for power supply, so that power-saving maintenance is realized; when the power is off, the holding circuit is cut off through the relay, and the coil follow current loop is cut off, so that the quick release is realized. The invention provides a control method of an electricity-saving and quick-release control circuit of a contactor, which is applicable to alternating current power supply type, direct current power supply type and alternating current and direct current universal contactors and reduces coil heating of the contactors, thereby reducing energy consumption and temperature rise.)

1. A control method of a power-saving and quick-release control circuit of a contactor is characterized in that: the method comprises the following steps:

1) when power is on: the rectified large voltage is directly connected into a coil of the contactor, so that the contactor is electrified and quickly closed;

2) time delay: after the circuit is delayed, the large voltage is cut off through a switch S1, and a coil of the contactor is switched to a low-voltage isolation power supply mode, so that the energy-saving maintenance of the contactor is realized;

3) when power is lost: and the relay is adopted to cut off the power supply and the coil, so that the contactor is quickly released.

2. The method of claim 1, wherein the method further comprises the steps of: the high voltage directly drives a contactor coil, the contactor coil is connected with a first solid-state electronic device in series, and the first solid-state electronic device is in a conducting state during attraction; the first solid-state electronic device is a full-control device such as a high-power MOS tube, an IGBT, a SIC-MOS and the like.

3. The method of claim 2, wherein the step of controlling the power saving and quick release control circuit comprises the steps of: after the power-on time delay, the driving circuit works to switch the coil of the contactor to a low-voltage isolation power supply, the time delay circuit adopts an RC time delay circuit, the driving circuit comprises a second solid-state electronic device, and the second solid-state electronic device is an MOS type triode or a special driving chip; the low-voltage isolation power supply comprises a switch type isolation power supply module, a linear type isolation power supply module and a transformer step-down rectification module.

4. A method of controlling a power saving and quick release control circuit for a contactor as claimed in claim 3, wherein: the output end of the low-voltage isolation power supply is connected with one end of the contactor coil through a diode and a normally open contact of a relay, and the output end of the low-voltage isolation power supply is connected with the other end of the contact coil.

5. A method of controlling a power saving and quick release control circuit for a contactor as claimed in claim 3, wherein: the delay circuit and the driving circuit are powered by adopting a single rectifier bridge.

6. A method of controlling a power saving and quick release control circuit for a contactor as claimed in claim 3, wherein: the relay is an electromagnetic relay, and the power supply of the electromagnetic relay comprises independent rectifier bridge power supply or independent power supply or optical coupler power supply; and the normally open contact of the electromagnetic relay is connected into the coil of the contactor in series with the output end of the low-voltage isolation power supply '+'.

7. The method of claim 6, wherein the step of controlling the power saving and quick release control circuit comprises the steps of: and the other group of normally open contacts of the electromagnetic relay is connected among the time delay circuit, the drive circuit and the independent rectifier bridge in series, and the normally closed contacts of the electromagnetic relay are connected to the voltage stabilizing pipe sides of the time delay circuit and the drive circuit in parallel.

Technical Field

The invention provides a contactor driving and power-saving holding circuit which can be suitable for alternating current power supply type, direct current power supply type and alternating current and direct current universal contactors and can effectively shorten the release time of the contactors.

Background

The AC/DC contactor mainly controls electric equipment such as motors, transformers and lighting, and plays an important role in the life and economic development of people. Heat loss is one of the important sources of heating of the contactor housing and contacts. How to effectively reduce the heat loss of the contactor and improve the utilization efficiency of the electric energy has become the current hot research field. The energy consumption in the contactor becomes a heating source, and mainly comprises three parts, including heating generated by coil holding current, heating generated by contact resistance and arc transient heat. In which contact heat generation and arc heat generation are difficult to fundamentally improve or there is a limit. While the coil heating can achieve a significant effect of decreasing by the power of 2 by reducing the current while holding. Therefore, the invention mainly controls the contactor coil to keep heating, and reduces the heating of the coil while ensuring the contactor to keep stability, thereby reducing energy consumption and temperature rise.

The drive circuit of the contactor mainly controls the coil current, adjusts the size of the yoke iron in the contactor to the attraction force of the armature iron, controls the on-off of the contactor contact, the attraction of the contactor needs certain attraction voltage, the coil needs larger attraction current, but when the contactor is maintained to be attracted, the holding current on the coil is smaller than the current needed when the contactor is attracted, the design of the miniature power-saving drive circuit of the direct current drive type contactor can effectively control the coil current, so that the energy-saving effect is achieved, and the miniature power-saving drive circuit has strong practical significance.

Disclosure of Invention

【1】 Technical problem to be solved

The invention provides a comprehensive type power-saving control method for power-on driving, power-saving keeping and power-down quick release of a contactor, which can be suitable for alternating current power supply type, direct current power supply type and alternating current and direct current universal contactors, and reduces coil heating of the contactors, thereby reducing energy consumption and temperature rise.

【2】 Technical scheme for solving problems

The invention provides a control method of an electricity-saving and quick-release control circuit of a contactor, which comprises the following steps:

1) when power is on: the rectified large voltage is directly connected into a coil of the contactor, so that the contactor is electrified and quickly closed;

2) time delay: after the circuit is delayed, the large voltage is cut off through a switch S1, and a coil of the contactor is switched to a low-voltage isolation power supply mode, so that the energy-saving maintenance of the contactor is realized;

3) when power is lost: and the relay is adopted to cut off the power supply and the coil, so that the contactor is quickly released.

Further, the large voltage directly drives a contactor coil, the contactor coil is connected with a first solid-state electronic device in series, and the first solid-state electronic device is in a conducting state during attraction; the first solid-state electronic device is a full-control device such as a high-power MOS tube, an IGBT, a SIC-MOS and the like.

Further, after the power-on delay, the driving circuit works to switch the contactor coil to a low-voltage isolation power supply, the delay circuit adopts an RC delay circuit, the driving circuit comprises a second solid-state electronic device, and the second solid-state electronic device is an MOS type triode or a special driving chip; the low-voltage isolation power supply comprises a switch type isolation power supply module, a linear type isolation power supply module and a transformer step-down rectification module.

Furthermore, the output end of the low-voltage isolation power supply "+" is connected with one end of the coil of the contactor through a diode and a normally open contact of a relay, and the output end of the low-voltage isolation power supply "-" is connected with the other end of the contact coil.

Furthermore, the delay circuit and the driving circuit adopt independent rectifier bridges for power supply.

Furthermore, the relay is an electromagnetic relay, and the power supply of the electromagnetic relay comprises independent rectifier bridge power supply or independent power supply or optical coupler power supply; and the normally open contact of the electromagnetic relay is connected into the coil of the contactor in series with the output end of the low-voltage isolation power supply '+'.

Furthermore, another group of normally open contacts of the electromagnetic relay is connected in series between the delay circuit, the drive circuit and the single rectifier bridge, and the normally closed contacts of the electromagnetic relay are connected to the voltage stabilizing pipe sides of the delay circuit and the drive circuit.

【3】 Advantageous effects

The invention provides a control method of an electricity-saving and quick-release control circuit of a contactor, which is applicable to alternating current power supply type, direct current power supply type and alternating current and direct current universal contactors and reduces coil heating of the contactors, thereby reducing energy consumption and temperature rise.

Drawings

FIG. 1 is a schematic block diagram of the present invention;

FIG. 2 is a circuit diagram of a fast release scheme of the present invention;

FIG. 3 is a second circuit diagram of the fast release scheme of the present invention;

FIG. 4 is a diagram of an embodiment employing a fast release scheme two and transistor switching;

FIG. 5 illustrates a first embodiment of a circuit 1 employing a fast release scheme and transistor switching;

FIG. 6 shows a first embodiment of a circuit 2 employing a fast release scheme and transistor switching;

FIG. 7 is a circuit for implementing the first fast release scheme and the driver chip switching.

Detailed Description

The following describes embodiments of the present invention in detail with reference to the accompanying drawings.

Referring to fig. 1 to 7, the method for controlling a power saving and quick release control circuit of a contactor according to the present invention includes the following steps:

1) when power is on: the rectified large voltage is directly connected into a coil of the contactor, so that the contactor is electrified and quickly closed;

2) time delay: after the circuit is delayed, the large voltage is cut off through a switch S1, and a coil of the contactor is switched to a low-voltage isolation power supply mode, so that the energy-saving maintenance of the contactor is realized;

3) when power is lost: and the relay is adopted to cut off the power supply and the coil, so that the contactor is quickly released.

In the example, the large voltage directly drives a contactor coil, the contactor coil is connected with a first solid-state electronic device in series, and the first solid-state electronic device is in a conducting state when attracting; the first solid-state electronic device is a full-control device such as a high-power MOS tube, an IGBT, a SIC-MOS and the like.

In this example, after the power-on delay, the driving circuit works to switch the contactor coil to the low-voltage isolation power supply, the delay circuit adopts an RC delay circuit, the driving circuit includes a second solid-state electronic device, and the second solid-state electronic device is an MOS type triode or a special driving chip; the low-voltage isolation power supply comprises a switch type isolation power supply module, a linear type isolation power supply module and a transformer step-down rectification module.

In this example, the output end of the low voltage isolation power supply "+" is connected with one end of the contactor coil through a diode and a normally open contact of a relay, and the output end of the low voltage isolation power supply "-" is connected with the other end of the contact coil.

In this example, the delay circuit and the driving circuit are powered by separate rectifier bridges.

In the example, the relay is an electromagnetic relay, and the power supply of the electromagnetic relay comprises a single rectifier bridge power supply or an independent power supply or an optical coupler power supply; and the normally open contact of the electromagnetic relay is connected into the coil of the contactor in series with the output end of the low-voltage isolation power supply '+'.

In this example, another set of normally open contacts of the electromagnetic relay is connected in series between the delay circuit, the driving circuit and the separate rectifier bridge, and the normally closed contacts of the electromagnetic relay are incorporated into the voltage stabilizing pipe sides of the delay circuit and the driving circuit.

The fast release circuit of the present invention is described in detail with reference to the above embodiments, with reference to fig. 2-3:

1) as shown in fig. 2, the relay is directly adopted to realize quick release; after full-bridge rectification, external input voltage is reduced in voltage through a resistor FR1 and then is connected to a quick release relay coil FJ1, and parameters of the resistor FR1 and a direct current relay coil FJ1 are determined by three parameters of pull-in voltage, release voltage and rated working voltage of a contactor; for example, when the relay FJ1 is rated at 110V, the resistance values of the coils of the resistors FR1 and FJ1 are optionally equal, at this time, the pull-in voltage and the release voltage of the contactor are about 2 times of the pull-in voltage and the release voltage of the relay FJ1, the capacitor FC1 is used for rectifying the input voltage when the driving voltage is alternating current, the 100Hz armature vibration when the voltage on the relay FJ1 is close to the release voltage is prevented, the FD5 is used for limiting the release overvoltage of the FJ1 relay, the contact side of the relay FJ1 is connected with an RC buffer circuit in parallel (formed by connecting a resistor FR2 and a nonpolar capacitor FC2 in series), the extremely high overvoltage when the contact of the FJ1 opens a coil FK of the contactor is prevented, this overvoltage may be reflected to the gate of switch S3 shown in fig. 1, causing S3 to repeatedly turn on and off, affecting its lifetime and reliability, the resistor FR3 connected in parallel with the FJ1 contact is a resistor with an extremely large resistance and is used for providing a discharge loop for the FC 2.

2) As shown in fig. 3, the quick release circuit is composed of a low-voltage power supply U1, an optocoupler U2 and a relay FJ 1; when the power is on, external control voltage (alternating current or direct current) passes through the full-bridge FD1-FD4, the optocoupler U2 is conducted, and a coil of the relay FJ1 is powered by the power supply U1 and is attracted; when the power is off, the external control voltage (alternating current or direct current) disappears, the optocoupler U2 is turned off, the coil of the relay FJ1 is powered off, the FJ1 contact is rapidly opened, and the coil FK of the contactor is rapidly powered off and released.

The power-saving driving circuit of the present invention will be described in detail with reference to the above embodiments, with reference to fig. 4 to 7:

1) as shown in fig. 4, when power is turned on, an input control voltage (ac or dc) is rectified into a dc (hereinafter referred to as VAA) by the capacitors C3, the common mode inductor L1, and the voltage dependent resistors MOV through D3, D4, D10, and D11; VAA is applied to the switch Q1 and the contactor coil K1 (at this time, Q1 is off, no current flows to K1, and the contactor does not start operating); VAA is applied to the low voltage isolated power supply U3, causing U3 to output a low voltage dc voltage.

2) As shown in fig. 4, the input control voltage (ac or dc) is rectified into dc by D6, D7, D10, D11, and rectified by capacitor C4.

3) As shown in fig. 4, when the input control voltage (ac or dc) is established, power source U1 is powered. Meanwhile, direct current voltage is rectified through full bridges D1, D2, D10 and D11, an optocoupler U2 is conducted, a coil of a J1 relay is electrified, and a contact of a J1 relay is closed.

4) As shown in fig. 4, after the relay contact J1 is closed, a dc voltage (hereinafter referred to as VBB) is established at the K pole of D9 through the resistor R4 and the voltage regulator tube D9. VBB is divided by R5 and R8, and then is added to the grid of a switch Q1 to turn on Q1, and rectified direct current voltage VAA is added to a coil of a contactor K1 to pull in the contactor.

5) Referring to fig. 4, VBB charges the capacitor C6 through the resistor R6, and after a certain time, the voltage of the capacitor C6 reaches the gate-on voltage of the switch Q2, the switch Q2 is turned on to pull the gate voltage of the switch Q1 low, and the switch Q1 is turned off. The dc voltage VAA is cut off from the contactor coil K1.

6) As shown in fig. 4, at the same time, because the contact of the relay J1 is closed, the low-voltage isolation power supply U3 directly supplies power to the coil K1 of the contactor through the diode D6 and the contact J1, and the contactor is in a holding state.

7) As shown in fig. 4, when power is off, since J1 is opened rapidly, the contactor coil K1 has no free-wheeling loop, the coil current rapidly drops to 0, and the contactor starts to release. The specific process is illustrated in fig. 3.

8) As shown in fig. 4, TVS1 prevents coil overvoltage from breaking down Q1, and TVS2 prevents Q1 gate voltage from being too high to cause Q1 breakdown.

9) Fig. 5 is different from fig. 4 in that the fast release circuit adopts the scheme shown in fig. 2, and the specific process is illustrated in fig. 2.

10) As shown in fig. 6, it is different from fig. 5 in that a normally closed contact of a relay J1 is connected in parallel to two sides of a zener diode D9; the power-on switch has the advantages that the J1 is opened without rebound when the power is on, and the switch Q1 cannot be switched on or off by mistake.

11) As shown in fig. 7, it differs from fig. 6 in that the driving circuit of the switch Q1 uses a dedicated driving chip, such as IR 4427S; the advantages are that the gate voltage of the switch Q1 has a steep falling edge, the Q1 is turned off rapidly, and the dynamic power consumption is low. Therefore, the margin of the switch Q1 can be selected to be smaller, and the overall circuit reliability is higher.

The invention provides a control method of an electricity-saving and quick-release control circuit of a contactor, which is applicable to alternating current power supply type, direct current power supply type and alternating current and direct current universal contactors and reduces coil heating of the contactors, thereby reducing energy consumption and temperature rise.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the technical principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.