CN201425921Y - Electromagnetic relay zero-crossing switch circuit - Google Patents

Abstract

The utility model discloses an electromagnetic relay zero-crossing switch circuit, which is characterized by comprising an intelligent control chip, a trace detection circuit and an AC sampling circuit, wherein the intelligent control chip is respectively connected with the outputs of the trace detection circuit and the AC sampling circuit and controls the output of the electromagnetic relay; theAC sampling circuit is used for detecting the input AC voltage signal, the trace detection circuit is used for detecting the contact switch signal of the electromagnetic relay, and the intelligent control chip is used for collecting, storing and computing the input AC voltage signal and the contact switch signal of the electromagnetic relay and for controlling the switch of the electromagnetic relay. The utility model solves the problems of the sparking and EMI of the electromagnetic relay through the circuit self-learning, improves the service life of the relay, and reduces the production cost of the circuit design.

Description

An electromagnetic relays zero switch circuit

FIELD

The present invention belongs to the technical field of electronic circuits, and particularly to a zero-crossing electrical solenoid switch circuit. Background technique

A control circuit electrically band collar bucket, electric water heaters, ovens, air conditioners, refrigerators and other appliances used in most high-power electromagnetic relay control, and the relay switch is the ignition process of the relay contacts killer, greatly reducing the life of the relay and also brought EMI interference.

The applicant has submitted on this issue ignition relay had been about to solve the problem of zero trigger circuit

Patent application, reference may be made Patent ZL 2006 2 0039011.1, the present patent application is based on a first improvement, the thyristor is removed, reducing the cost, not only can achieve the same purpose, but also can accommodate more relays .

SUMMARY

The object of the present invention is disclosed for improving the service life of the electromagnetic relay, an electromagnetic interference EMI solve the zero-crossing relay switch circuit.

Aspect of the present invention is an electromagnetic relays zero switch circuit comprising intelligent control chip, the tracking detection circuit and a sampling circuit AC, the smart controller chip is connected to the tracking and detection

Circuit and the AC output sampling circuit, the control output of the electromagnetic relay, wherein: said sampling circuit for detecting AC input AC voltage signal; a detection circuit for the tracking electromagnetic relay contact switch signal detection; the smart chip for controlling the opening of the input AC voltage signal and the electromagnetic relay contacts

OFF signal acquisition, storage and computation, and a switch for controlling the electromagnetic relay.

The alternating current sampling circuit of a resistor and a capacitor two three parallel circuit in series with a resistor. The three resistor values ​​10KQ, two capacitor values ​​0.01 li F, a resistor value 1MQ. The tracking and detection circuit consists of two series resistors and four capacitors in parallel circuit with three resistors. The value of resistor four 10KQ, three values ​​of the capacitor 0.01 u F, two resistor values ​​1MQ. What follows is a brief description on the principles of the present invention technical solution. A mechanical electromagnetic relay is an electromagnetic switch, which is the basic principle when the power to the coil, which will generate a magnetic field of the armature from a normally closed to normally open suction down contact to the contact, as is the metal contact, so relay has very low on-resistance characteristics, it can be used in applications where high power control.

But also because the electromagnetic relay on and off are mechanical action, so that when a relay is powered from the switch while moving to the other side will take some time, which is the operation time of the operation time of the relay, the general power relay 5 about -30mS, but also has a large individual differences, this time for electrical work in general is no effect, but this will not lead to the alignment voltage zero crossing on and off the load current is caused by switching surges grid will cause interference, which is the relay has been unable to solve the problem, some of the products developed using the relay control of a relay base is calculation of the average pull-in time, then the zero crossing ahead some time to open the relay, so the basic part can make switching action is too close to zero, but considering individual differences, did not really solve the problem.

Further control of the electromagnetic relay when the high voltage at the moment a large current will tend to switch on the switching arcing contact, which is generally seen ignition phenomena, electrical wear occurs at this time, and this is much wear more than mechanical wear, resulting in an electrical relay life far less than their mechanical life and electrical life are generally 5 - 10 million, while the purely mechanical life in general can reach more than one million times, for a lot of people are committed to the industry electron interrupter, generally use arc chute, or an electronic RC crowbar to extinguish the arc crowbar.

For the above problem, the technical solution of the present invention in advance in front of the zero crossing time for a power relay solenoid, if this time is exactly equal to the operation time of the relay, the relay contacts can just pull the zero crossing. For different types of electromagnetic relays, the relay or different individuals of the same, or even the same individual or different driving voltages external conditions such as temperature, there are large differences in the operation time. Since the same can not advance to all relays, the technical solution of the present invention to track each time the relay contacts or disconnection detection or pull off the real time data into the IC, it is stored calculated to correct the amount in advance, so as to advance an amount equal to just let the operating time to achieve zero trigger. Meanwhile, the present invention does not require additional circuitry extinguishing device.

The utility model self-learning circuit in a way to solve the electromagnetic relay ignition problems and EMI problems and improve the life of the relay, reducing design and manufacturing cost of the circuit.

FIG 4 is an embodiment of the electromagnetic relay embodiment according to the present invention a zero-crossing module switch circuit 2 is a functional block diagram of the electromagnetic relay of the present invention, a zero-crossing switching circuit schematic embodiment of FIG.

Detailed ways

Below in conjunction with the accompanying drawings, the present invention is further described particular embodiment. In the present invention, the circuit stores therein in advance a first open relay default initial value of the amount, in turn relays the signal received after the first, according to advance default open relay, then the relay contacts is detected pull real time, exactly if zero crossing, the next to continue to control the advance, and the general relay bursts will pull a little time lag or advance, the IC will use this in advance and stored in the IC lag time, for correcting the calculated weighted advance, advance is reduced, then add the hysteresis, the second on the time to open the relay after the correction, the same if not disposed of just over zero, then if the advance or lag correction amount in advance, so a few times to complete tracking, after the zero crossing will be the relay pull. The process of closing and opening the same.

1, the electromagnetic relays zero switch circuit module includes an intelligent control chip, the tracking detection circuit and a sampling circuit AC, wherein AC sampling circuit for detecting, tracking and detection circuit of the AC input voltage signal for the electromagnetic relay detection, intelligent control chip contact switch signal for acquiring, storing, and calculating the electromagnetic alternating voltage signal and the relay contact switch signal, and a switch for controlling the input of the electromagnetic relay. The main relay control circuit completion signal acquisition, storage, calculation, output processing, the AC resistance can be only one sampling circuit, may be added to secure a resistor and a capacitor, and tracking the sampling circuit may have the same configuration with the sampling circuit AC , and all of the current relay can be used to drive a relay DC market.

As shown, in FIG. 2 PTI U1 is a dedicated control chip, the core control circuit controls the coordination of the other circuits; R1, R3 and C2 zero-crossing information is used to collect AC power, R2, R4, and C3 is a relay contact operating state detection circuit for detecting whether the relay has zero crossing pull or off, according to the information in the IC pull adjustment control; R5, Q1 and D1 is the relay coil driver circuit for controlling the relay or disconnected. Cl is the power supply filter capacitor IC. Sampling the AC circuit by the resistor R3 and the capacitor C2 is a parallel circuit in series with a resistor R1, a resistor R3 in 10KQ, the capacitor C2 has the value 0.01 u F, resistors Rl values ​​1M Q. Tracking and detection circuit by the resistor R4 and the capacitor C3 is connected in parallel circuit in series with a resistor R2, resistor R4 value 10KQ, values ​​of 0.01uF capacitor C3, resistor R2 value 1MQ.

In summary, the technical solution of the present invention is to achieve a method for self-learning type relays zero switch circuit by the intelligent control IC, a circuit composed of AC sampling, tracking and detection circuit, a load relay and the like, wherein the intelligent control circuit Company Some or all of the circuit ASIC, which is the core of the system, will make the determination gives a drive signal phase, and the current state of the AC signal after receiving the relay control instruction to open or close the relay. AC sampling circuit responsible for sampling a phase alternating current; tracking the sampling operation state detecting circuit of the relay contacts, to confirm there is no real pull. Using the principle of the present embodiment to automatically learn the tracking pull-in operation of the relay time delay switch according to the relay itself, to give the corresponding advance way to achieve electromagnetic relays zero switch. Aspect of the present invention without further attachment means, automatically adapt to various relays, relays individual differences no longer a problem.

6

Claims (5)

1. An electromagnetic relays zero switch circuit comprising intelligent control chip, the tracking detection circuit and a sampling circuit AC, the intelligent control chip connected to the tracking detection circuit and the AC output of the sampling circuit respectively, the control output of the electromagnetic relay, wherein: said sampling circuit for detecting an AC input AC voltage signal; a detection circuit for detecting said tracking electromagnetic relay contact switch signal; the smart chip for controlling the said input collection, storage and computation of the electromagnetic alternating voltage signal and the relay contact switch signal, and a switch for controlling the electromagnetic relay.

2, the electromagnetic relay as claimed in claim 1 represented by the zero crossing switching circuit, characterized in that the alternating sampling circuit of a resistor and a capacitor two three parallel circuit in series with a resistor.

3, shown an electromagnetic relay as claimed in claim 2, zero-crossing switching circuit, characterized in that said three resistor values ​​10KQ, two capacitor values ​​0.01 F, a resistor value 1MQ.

4, the electromagnetic relay as claimed in claim 1 represented by the zero crossing switching circuit, wherein the tracking detection circuit two four series resistor and a capacitor and a parallel circuit of three resistors.

5, the electromagnetic relay as claimed in claim 4 illustrated zero-crossing switching circuit, wherein said resistor four values ​​10KQ, three values ​​of the capacitor 0.01 u F, two resistor values ​​1MQ.