CN216928400U - Monostable relay using passive accurate motion parameter control chip - Google Patents

Abstract

A monostable relay using a passive accurate motion parameter control chip comprises a voltage division sampling circuit, the passive accurate motion parameter control chip, an MOSFET and a relay, wherein the voltage division sampling circuit carries out voltage division sampling on the voltage of an input end and inputs the voltage to a VT port of the control chip, and a GT port of the passive accurate motion parameter control chip is connected with a control end of the MOSFET; after the MOSFET is conducted, a negative power supply is provided for the relay coil, and the relay acts. The control chip has stable performance and low VT dispersion, and can accurately set the action value of the relay to realize the accurate control of the action value; therefore, the dispersion of the action value of the relay can be effectively controlled. The utility model can realize the accurate setting of the action value and the action time without increasing a power supply on the occasion that the action value and the action time of the monostable relay have strict requirements.

Description

Monostable relay using passive accurate motion parameter control chip

Technical Field

The utility model relates to a monostable relay using a passive precise action parameter control chip. In particular, the relay control system is used for controlling the relay action voltage, the relay action time, the reduced power consumption operation after the relay is started and the protection of a relay control loop.

Background

For a highly reliable control situation, there are clear and severe limitations on the operating range and operating time range of the relay, and the given operating range becomes narrower as the requirements for stability of the control system increase. For the occasions where a control loop needs contact expansion or signal isolation, the electromagnetic relay is small in size and limited in output contact number, and a plurality of relays are required to be connected in series or in parallel to meet the requirements. If the relay series connection mode is adopted, because the dispersion of the action value of the relay is larger, particularly when the relay combination is applied in series, the uncertainty of the action value is larger. If the parallel connection scheme of the relay is adopted, because of different voltage levels, the relays with different voltages are needed, at present, relay manufacturers such as Taike, Panasonic and Ohlong have the highest voltage level of a coil of 110VDC, and for the occasions with the voltage of more than 110V, a power resistor is needed to divide the voltage, the relay and the voltage divider resistor can generate large power consumption after long-term operation, and the service lives of the relay and the voltage divider resistor can be reduced after a long time.

Whether the relay is a monostable relay or a bistable relay, before each manufacturer leaves a factory, only the upper limit, namely the reliable action voltage of the relay, is detected, and the lower limit is not detected, so that the action range of the relay is very wide, and the dispersion is very large. At present, the product is before going on the production line, the complex intelligent system who adopts earlier carries out the action scope screening of relay before processing, then carry out the action parameter with divider resistance and match, the condition that the action value can not satisfy the standard still exists after the processing, especially bistable relay, the action scope of action coil is required to be satisfied promptly, the action scope of resetting the coil is required to be satisfied simultaneously again, it is difficult to add up to find suitable divider resistance, can carry out secondary action parameter to the defective work and match, change divider resistance promptly, the relay even, until the product is qualified, lead to monostable relay to have very big quality bottleneck.

For the occasion with higher requirement on the action time, the action range of the relay is screened before processing, then the action parameter is matched with the divider resistor, and the condition that the action time does not meet the standard still exists after processing. The defective products screened out are mostly used for replacing the relay under the condition that the normal power consumption of the relay and the divider resistor is ensured, so that a large amount of raw materials of an enterprise are wasted, and the labor cost is increased.

Therefore, the optimization of the control loop of the monostable and bistable relays needs to accurately control the action parameters of the relays, but the problem that an auxiliary power supply and a microprocessor cannot be added is a key solution of the industry, and meanwhile, the green operation of reducing the power consumption is gradually an industrial hotspot.

CN2021111201339 of the present applicant, a passive precise operation parameter control chip for relay, includes a power supply unit, which supports a wide power supply range of other units, covering the working voltage range of the relay; an internal LDO unit is connected, and the internal supply voltage of other units is supported by the regulated output voltage through VDD voltage; the three voltage sensors and the comparator unit output starting and locking signals of the PWM generator; a PWM generator for outputting a control waveform; the CMOS driving unit is used for matching and driving with the CMOS; and the PWM generator waveform duty ratio control unit is used for connecting and controlling the duty ratio of the PWM waveform output by the PWM generator. This utility model provides a control technique of relay that the integrity of power consumption operation, control circuit falls behind can accurate control, action after not having auxiliary power supply, action value and action time and keep watch on. However, the subsequent technologies need to be innovated and designed, especially for special occasions of some monostable and bistable relays and the like, the circuit is complex and low in performance in the prior art, the control method and the control device of the monostable and bistable relays can be realized by using the chip of the applicant, and the defects in the prior art are overcome.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a monostable relay device utilizing a passive accurate action parameter control chip.

The technical scheme of the utility model is that the monostable relay utilizing the passive accurate action parameter control chip comprises a voltage division sampling circuit, the passive accurate action parameter control chip, an MOSFET and a relay, wherein the voltage division sampling circuit carries out voltage division sampling on the voltage of an input end and inputs the voltage to a VT port of the control chip, and a GT port of the passive accurate action parameter control chip is connected with a control end of the MOSFET; after the MOSFET is conducted, a negative power supply is provided for the relay coil, and the relay acts. The action value of the relay can be accurately set by utilizing the stable performance of the control chip and the low dispersion of VT, so that the accurate control of the action value is realized; therefore, the dispersion of the action value of the relay can be effectively controlled.

For the occasion needing time delay, the VT input end of the passive precise action parameter control chip is connected with a capacitor in parallel, so that the precise time delay of the relay action can be obtained, the time delay precision is irrelevant to the parameters of the relay, and is only relevant to the time delay precision of the chip and the capacitance value of the parallel capacitor, so that the time delay precision of the relay can be well controlled, and the consistency can be reliably ensured.

When the voltage of the VT port is larger than a set value, the GT port is driven to output a PWM signal and drive the MOSFET to be conducted, a negative power supply is provided for the negative end of the relay coil, and the relay is driven to act; in the starting stage of the relay, in order to ensure the reliable action of the relay, the PWM outputs a waveform with 100 percent duty ratio, and the relay is quickly started; after the relay starts the stage, the relay enters the action stage, PWM outputs the PWM waveform that can guarantee the relay to reliably act, reduces the power consumption of monostable relay and divider resistance return circuit, realizes the power consumption operation that reduces of relay action stage, reaches green operation.

Generally, in a direct current application scene, a direct current relay is selected, in an alternating current application scene, an alternating current relay is selected, for convenience of design, a rectifier bridge and capacitance filtering scheme is adopted at the front end, the direct current relay is uniformly adopted in both a direct current loop and an alternating current loop, in an alternating current input loop, the relay works in a starting stage, an input waveform is a steamed bread wave, and a diode and a divider resistor need to be connected in series with a pin of an input port VIN to reduce starting power consumption of a passive precision relay control chip.

Meanwhile, the thermistor and the piezoresistor are connected in series in the loop for double protection, so that the anti-interference capability of the product is improved, and the EMC four-level requirement of the power industry is met. The fast power supply starting loop formed by the resistor R, MOS and the diode D is started fast, the starting speed is adjusted by the external capacitor of the VDD port, and finally the VDD is stabilized on the voltage which can be reliably driven by the MOS; the LDO device is arranged in the chip to provide a stable working power supply.

The relay coil is an inductance loop, inrush current can appear in the starting stage, at the moment, the inrush current must be avoided, and a specially-arranged PH comparator is used for judging the integrity of the relay coil loop in the starting stage. In the relay action stage, the relay can be stabilized at a constant current, and a PL comparator is specially arranged for judging the integrity of a relay coil loop in the relay action stage. PH and PL are unnecessary control parts, if the relay coil loop does not need to be monitored, a sampling loop is not selected, and the pin is pulled down directly.

The control device of the low-power consumption monostable relay is obtained according to the method. The action value of the monostable relay can be accurately controlled, the problem that the dispersion of the action value of the monostable relay is large, particularly, the uncertainty of the action value is larger when the relay combination is applied in series is solved, the voltage of VT of the monostable relay can accurately control the threshold value of the action voltage through a sampling circuit, the consistency of the action voltage in the production process can be ensured, and different action voltage ranges under different application scenes can be solved; the utility model realizes the accurate control of important parameters of the relay by using the least devices and the lowest cost. Particularly, the method avoids a large amount of relay parameter configuration work in the production process of the monostable relay and secondary parameter configuration work caused by parameter drift of the subsequent electric appliance after processing, and effectively solves the parameter configuration problem in the serial or parallel use process of the monostable and bistable relays. The production process and time are greatly simplified; and the green operation of reducing power consumption in the action stage of the relay is realized.

The utility model mainly solves the problem that the uncertainty of the action value is larger when the relay combination is applied in series because the dispersion of the action value of the monostable relay is larger. Based on the passive precise relay control chip of the applicant, the voltage of VT accurately controls the threshold value of the action voltage through a sampling circuit, can ensure the consistency of the action voltage in the production process, and simultaneously solves different action voltage ranges under different application scenes; the action time of the monostable relay can be regulated, the unit is mainly used for occasions needing time delay, a capacitor is connected in parallel with a VT input end of a passive precision control chip, so that accurate time delay of the monostable relay action can be obtained, the time delay precision is irrelevant to the parameters of the relay and is only relevant to the time delay precision of the chip and the capacitance value of the capacitor, the time delay precision of the monostable relay can be well controlled, and the consistency can be reliably ensured; the monostable relay runs with low power consumption, the unit mainly outputs corresponding PWM waveform through a PWM generator, and then controls the monostable relay to be turned on and off through the MOSFET driving unit; the PWM generator outputs the duty ratio of the PWM waveform to reduce the power consumption of the monostable relay and the divider resistor in the operation stage, thereby realizing the reduced power consumption operation of the relay in the action stage and achieving the green operation. The utility model is applied to the occasions with strict requirements on the action value and the action time of the monostable relay, can realize the accurate setting of the action value and the action time without increasing a power supply, can reduce the operation power consumption of the monostable relay and the divider resistor in the stable operation stage, and can realize the primary qualification rate of products in a mode of connecting a plurality of relays in series or in parallel and the low power consumption operation in the stable operation stage of the products. Has the advantages that: the utility model overcomes the defects of the existing monostable and bistable relay control circuit that the parameter adjustment is complicated: because the dispersion of the action value and the action time of the relay is large, and the requirement on the action value and the action time is high, the production and the parameter configuration of the relay are very difficult; the utility model can realize the accurate setting of the action value and the action time without increasing a power supply on the occasion with strict requirements on the action value and the action time of the relay, and can realize the one-time qualification rate of all relay products. Meanwhile, the power consumption reduction operation of the relay in the action stage is realized, and the green operation is achieved. According to the control method of the low-power consumption monostable relay, which is realized by the embodiment of the utility model, the action characteristic of the whole relay is not influenced by the action characteristic of the relay, and the accurate control of the action value and the action time of the monostable relay is thoroughly solved. Can reduce a large amount of equipment investment and a large amount of screening work before processing. Meanwhile, the power consumption reduction operation of the relay loop is realized, and the contribution to energy conservation and emission reduction is made.

In addition, because the dispersion of the action value of the relay is large, and the requirement of the action value is high, the production and parameter configuration of the relay are very difficult or impossible. The utility model can realize the accurate setting of the action value and the action time without increasing a power supply on the occasion with strict requirements on the action value and the action time of the relay, and can realize the one-time qualification rate of all relay products. Meanwhile, the power consumption reduction operation of the relay in the action stage is realized, and the green operation is achieved.

The utility model can realize the precise setting of the action value and the action time of the monostable relay on the occasion with strict requirements on the action value and the action time of the monostable relay, solves the complex loop for processing the problem in the prior art, can reduce the operation power consumption of the monostable relay and the divider resistor in the stable operation stage of the product, can realize the one-time qualification rate of the product in a serial connection mode or a parallel connection mode of all relays and the low-power-consumption operation in the stable operation stage of the product, and can realize the one-time qualification rate of all relay products. The utility model can be applied to all application occasions by selecting the direct current relay even under the alternating current application scene.

Drawings

FIG. 1: the application schematic diagram of the low-power consumption monostable intermediate relay with accurately controlled action value is illustrated.

Detailed Description

The following describes the present invention in detail by way of an embodiment with reference to fig. 1.

The following description sets forth examples and descriptions that are presented to illustrate the principles of the utility model and are not intended to limit the scope of the utility model. The scope of the actual utility model should be defined in accordance with the scope of the claims.

FIG. 1: the application schematic diagram of the low-power consumption monostable intermediate relay with accurately controlled action value is illustrated.

And an externally started signal contact is closed, power is supplied to the RL1A and RL2A coils, meanwhile, power is supplied to a passive precision relay control chip, and the inside of the chip is rapidly charged. Since the chip supports a wide range of input power supplies (both ac and dc), there is no need to use different models of chips for different voltage class loops.

At the moment, the VT port judges whether the input voltage meets the action voltage standard of the relay or not through the sampling circuit, and the control precision at the moment is determined by the precision of the VT comparator and is not influenced by the action value of the relay. And if the sampling value is greater than the threshold value of the VT comparator, the GT port output is driven to drive the MOSFET to be conducted, and the MOSFET is conducted to provide a negative power supply for the relay coil to act. The RL1A, RL2A coils are controlled simultaneously.

After the relay enters the action stage, PWM outputs PWM waveforms capable of ensuring reliable action of the relay, power consumption of the monostable relay and a voltage dividing resistor loop is reduced, power consumption reduction operation of the relay in the action stage is achieved, and green operation is achieved.

For the input end VT comparator, when the input end VT comparator is larger than the set threshold value, the GT outputs, in order to ensure the stable operation of the relay, the VT comparator is provided with a hysteresis characteristic, only when the sampling voltage is lower than the return value threshold value, the GT stops leading out, thereby the relay is also provided with a good hysteresis characteristic.

The passive precision relay control chip of the applicant is utilized, the internal voltage sensor and the comparator unit, namely the VT detection unit, are the relay excitation voltage detection unit, when the voltage of the external voltage division loop is greater than the threshold value of VT, the GT port is driven to output the PWM signal and drive the MOSFET to be conducted, and the MOSFET is conducted to provide a negative power supply for the relay coil, so that the relay acts.

In order to maintain the stability of control, when the VT voltage drops, the chip is provided with a return coefficient, and only when the VT voltage is lower than a return voltage threshold value, the PWM stops outputting and enters an undervoltage protection mode. The dispersion of the VT with stable chip performance is low, the action value of the relay can be accurately set, and the accurate control of the action value is realized; therefore, the dispersion of the action value of the relay can be effectively controlled.

For the occasion needing delay control, a capacitor can be connected in parallel with the input end of the VT, so that accurate delay of relay action can be obtained, the delay precision is irrelevant to the parameters of the relay and is only relevant to the delay precision and the capacitance value of a chip, the delay precision of the relay can be well controlled, and the consistency can be reliably ensured.

Generally, in a direct current application scene, a direct current relay is selected, in an alternating current application scene, an alternating current relay is selected, for convenience of design, a rectifier bridge and filtering scheme is adopted at the front end, the direct current relay is uniformly adopted in both a direct current loop and an alternating current loop, in an alternating current input loop, the relay works in a starting stage, an input waveform is a steamed bread wave, and a diode D5 and a voltage division resistor R4 need to be connected in series with a pin of an input port VIN to reduce starting power consumption of a passive precision relay control chip. Meanwhile, the thermistor RN1 and the shunt varistor RV1 are connected in series in a loop to carry out double protection, so that the anti-interference capability of the product is improved, and the EMC four-level requirement of the power industry is met.

The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the utility model and these are intended to be within the scope of the utility model.

Claims (3)

1. A monostable relay using a passive accurate motion parameter control chip is characterized by comprising a voltage division sampling circuit, the passive accurate motion parameter control chip, an MOSFET and a relay, wherein the voltage division sampling circuit carries out voltage division sampling on input end voltage and inputs the voltage to a VT port of the control chip, and a GT port of the passive accurate motion parameter control chip is connected with a control end of the MOSFET; after the MOSFET is switched on, a negative power supply is provided for a relay coil, the relay acts, and the action value of the relay can be accurately set by utilizing the stable performance of a control chip and the low dispersion of VT, so that the accurate control of the action value is realized; therefore, the dispersion of the action value of the relay can be effectively controlled.

2. The monostable relay according to claim 1, characterized in that a capacitor is connected in parallel to the VT input of the passive precise operation parameter control chip to obtain a precise relay operation delay.

3. The monostable relay according to claim 1, characterised in that a series thermistor, parallel varistor for double protection is connected in the input circuit.

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