Bistable relay using passive precise action parameter control chip

Abstract

A bistable relay utilizing a passive precise action parameter control chip comprises an action coil loop and a reset coil loop which are of the same structure, the action coil loop or the reset coil loop comprises a voltage division sampling circuit, a passive precise action parameter control chip, an MOSFET and a relay, the voltage division sampling circuit carries out voltage division sampling on input end voltage, and the passive precise action parameter control chip is connected with the relay. The passive precise action parameter is input to a VT port of the control chip, and a GT port of the passive precise 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 a relay coil, and the relay acts; the passive precise action parameter control chip is stable in performance, the dispersion degree of VT is low, the action value of the relay can be precisely set, and precise control over the action value of the action coil and the action value of the reset coil is achieved. According to the utility model, accurate setting of the operating value and the operating time can be realized without adding a power supply for occasions with strict requirements on the operating value and the operating time of the bistable relay.

Description

TECHNICAL FIELD

[0001] The utility model relates to the bistable relay of passive precision action parameter control chip. Especially about the control of relay action coil voltage, the control of reset coil voltage, the control of relay action coil time, the control of reset coil time, the running of relay after starting, the protection of relay control loop. BACKGROUND

[0002] The control of power system to electric appliance and even to power grid needs to have definite and strict limitation to the action range and action time range of relay, and with the improvement of the requirement of control system stability, the given action range is more and more narrow. For the occasion needing contact expansion or signal isolation of control loop, due to the small volume of electromagnetic relay and the limited number of output contacts, multiple relays need to be connected in series or parallel to meet the requirement. Since the action values of action coil and reset coil of bistable relay itself exist dispersion, if the bistable relay is used in combined series application, the uncertainty of action coil and reset coil action value is greater. If the parallel scheme of bistable relay is used, due to different voltage levels, relays with different voltages are needed, and at present, the relay manufacturers such as Tyco, Panasonic and Omron generally have the highest voltage level of coil 60VDC, and for the occasion with voltage above 60V, power resistor needs to be used for voltage division. Long-term operation will cause great power consumption of both bistable relay and voltage division resistor, and the service life of bistable relay coil and voltage division resistor will be reduced.

[0003] At present, before the relays of various relay manufacturers are shipped, only the upper limit of bistable relay action coil and reset coil, i.e. the reliable action voltage of relay, is detected, and the lower limit is not detected, which leads to wide action range and great dispersion of bistable relay. Before the product is put into operation, the complex intelligent system is used to select the action range of relay before processing, and then the action parameter matching with voltage division resistor is carried out, and after processing, the action value still does not meet the standard. For the occasion with high requirement of action time, the action range of relay is selected before processing, and then the action parameter matching with voltage division resistor is carried out, and after processing, the action time still does not meet the standard. The defective products selected out are mostly replaced with relays under the condition of ensuring normal power consumption of relay and voltage division resistor, which leads to large waste of raw materials and increase of labor cost of enterprise.

[0004] Therefore, the optimization of control loop of bistable relay needs to accurately control the action parameters of action coil and reset coil of bistable relay, but cannot increase auxiliary power supply and microprocessor, which has become the key problem of the industry, and the green running with reduced power consumption has gradually become the hot spot of the industry. CONTENT OF UTILITY MODEL

[0005] The utility model discloses a kind of bistable relay device using passive precision action parameter control chip.

[0006] The utility model discloses a kind of bistable relay using passive precision action parameter control chip, including the same construction action coil loop and reset coil loop, action coil or reset coil loop includes voltage division sampling circuit, passive precision action parameter control chip, MOSFET and relay, voltage division sampling circuit is sampled to input end voltage, and input is to the VT port of control chip, passive precision action parameter control chip GT port connects MOSFET control end;MOSFET is turned on to provide negative power supply for relay coil, relay action;Using passive precision action parameter control chip performance stability, VT's discrete degree is low, can accurately set the action value of relay, realizes the accurate control of action coil and reset coil action value.It can effectively control the discrete degree of action coil and reset coil action value of bistable relay in this way.

[0007] For the occasion needing delay, capacitor is connected in parallel at the VT input end of passive precision action parameter control chip, accurate relay action delay can be obtained, the precision of delay is irrelevant to the parameter of relay itself, only related to the delay precision of chip and the size of the capacitance value of parallel capacitor, so that the delay precision of relay can be well controlled, and then consistency can be reliably guaranteed.

[0008] Through action coil, reset coil voltage division circuit, input voltage is divided, and input is to VT port, when the voltage of VT port is greater than set value, drive GT port output PWM signal, and drive MOSFET to turn on, provide negative power supply for the negative end of relay coil, drive relay action;For the starting stage of relay, to ensure that relay can reliably act, PWM output 100% duty ratio waveform, relay starts quickly;After relay starting stage, relay enters action stage, PWM output can guarantee the PWM waveform of reliable action of relay, reduce the power consumption of bistable relay and voltage division resistance loop, realize the low-power operation of relay action stage, achieve green operation.

[0009] Usually in direct current application scene, direct current relay will be selected, in alternating current application scene, alternating current relay is selected, to facilitate design, front end adopts rectifier bridge plus capacitor filter scheme, whether direct current loop or alternating current loop is unified to use direct current relay, in alternating current input loop, relay works in starting stage, input waveform is steamed bun wave, need to be connected in series with a diode and voltage division resistance at input port VIN pin, to reduce the starting power consumption of passive precision relay control chip.

[0010] At the same time, the thermistor is connected in series and the voltage-dependent resistor is connected in parallel in the circuit for double protection, improving the anti-interference ability of the product and meeting the EMC four-level requirements of the power industry. The fast power starting circuit composed of the resistor R, the MOS and the diode D is started quickly, and the starting speed is adjusted by the external capacitor of the VDD port, so that the VDD is finally stabilized at the voltage that can be reliably driven by the MOS. In order to provide reliable working power supply for the internal circuit and the MOS drive, the LDO device is arranged in the chip to provide stable working power supply.

[0011] The relay coil is an inductive circuit, and inrush current will occur in the starting stage, so the PH comparator specially arranged is used to judge the integrity of the relay coil circuit in the starting stage. In the relay action stage, the PL comparator specially arranged is used to judge the integrity of the relay coil circuit. PH and PL are non-essential control parts, and if the relay coil circuit does not need to be monitored, the sampling circuit can not be selected, and the pin can be directly pulled down.

[0012] According to the above, the control device of the low-power bistable relay is obtained. The action value of the bistable relay can be accurately controlled. The utility model solves the problem that the action value of the bistable relay itself has relatively large dispersion, especially when the relay is used in series combination, the uncertainty of the action value is larger. The voltage of the VT of the utility model is accurately controlled by the sampling circuit to control the threshold value of the action voltage, and the consistency of the action voltage in the production process is ensured. The utility model solves the problem of different action voltage ranges in different application scenarios with the least devices and the lowest cost. Especially, the utility model avoids the work of a large number of relay parameter configurations in the production process of the bistable relay and the secondary parameter configuration work caused by the parameter drift of the relay after processing, effectively solves the parameter configuration problem in the process of using the bistable relay in series or parallel, greatly simplifies the production process and time, and realizes the green operation of the relay in the action stage.

[0013] The utility model mainly solves the problem that the action value discreteness of the bistable relay itself is relatively big, especially when the relay combination is applied in series, the uncertainty of the action value is bigger. Based on the passive precision relay control chip of the applicant, the voltage of VT accurately controls the threshold value of the action voltage through the sampling circuit, and can ensure the consistency of the action voltage in the production process, and solve the different action voltage ranges in different application scenarios; the bistable relay action time can be adjusted and controlled, this unit mainly needs the delay occasion, the VT input end of the passive precision control chip is connected with the capacitor, and the accurate delay of the bistable relay action can be obtained, the delay precision is irrelevant to the parameters of the relay itself, and is only related to the delay precision of the chip and the capacitance value of the capacitor, so the delay precision of the relay can be well controlled, and the consistency can be reliably ensured; the bistable relay runs at low power consumption, the unit mainly outputs the corresponding PWM waveform through the PWM generator, and controls the bistable relay to open out through the MOSFET driving unit; the duty cycle of the PWM waveform output by the PWM generator is used to reduce the power consumption of the bistable relay and the voltage dividing resistor in the running stage, realizes the low-power running in the relay action stage, and achieves green running. The utility model is applied to the occasions with strict requirements on the action value and action time of the bistable relay, the action value and action time can be accurately set without increasing the power supply, the running power consumption of the bistable relay and the voltage dividing resistor can be reduced in the stable running stage of the product, and the one-time qualification rate of the relay product and the low-power running in the stable stage of the product can be realized.

[0014] Advantages: the utility model overcomes the complicated parameter adjustment of the existing bistable relay control circuit: the action value and action time discreteness of the relay itself is big, and it is very difficult to produce and configure parameters for the relay in the occasions with high requirements on the action value and action time; the utility model can accurately set the action value and action time in the occasions with strict requirements on the action value and action time of the relay without increasing the power supply, and can realize the one-time qualification rate of the relay product. The low-power running in the relay action stage is realized, and green running is achieved. According to the low-power bistable relay control method realized by the utility model embodiment, the action characteristics of the whole relay are no longer affected by the action characteristics of the relay itself, and the accurate control of the action value and action time of the bistable relay is completely solved. A large amount of equipment investment and a large amount of screening work before processing can be reduced. The low-power running of the relay circuit is realized, and contribution is made to energy saving and emission reduction.

[0015] Moreover, since the discrete degree of the action value of the relay itself is large, and for the occasions requiring high action value, the production and parameter configuration of the relay are very difficult or cannot be configured. The utility model makes that for the occasions requiring strict action value and action time of the relay, the accurate setting of the action value and action time can be realized without increasing the power supply, and the one-time yield of all relay products can be realized. At the same time, the power consumption of the relay action stage is reduced, and green operation is achieved.

[0016] The utility model makes that for the occasions requiring strict action value and action time of the bistable relay, the complex circuit of the prior art for processing this problem is solved, the accurate setting of the action value and action time can be realized without increasing the power supply, and the one-time yield of all relay products can be realized. At the same time, the power consumption of the bistable relay and the voltage dividing resistor in the stable operation stage can be reduced, the one-time yield of all relays in series or parallel mode and the low power consumption operation in the stable stage of the product can be realized, the utility model can realize the one-time yield of all relay products. The utility model selects the DC relay in all application places, and even in the AC application scene, the utility model can be applied. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1A 、 Figure 1B It is respectively action coil control loop reset coil control loop, and it is the application principle drawing of two sets of action value accurate control low power consumption bistable relay. The bistable relay needs two coil control loops. DETAILED DESCRIPTION

[0018] The following through the implementation case, and cooperate with the attached Figure 1A 、 1B The content of the utility model is explained in detail.

[0019] The following description enumerates the cases and introduces the basic concepts of the utility model, and is not intended to limit the content of the utility model. The actual scope of invention should be defined according to the scope of claims.

[0020] The external start signal supports a pulse signal or a long-term signal. When the SET external start contact is closed, a positive power supply is provided for the relay SET coil, and a power supply is also provided for the passive precision relay control chip, and the chip internally completes rapid charging. Since the chip supports a wide range of input power supplies (including AC and DC), different types of chips do not need to be used for circuits of different voltage levels. The input voltage is divided by the SET voltage dividing circuit and input to the VT11 port. When the voltage at the VT11 port is greater than the set value, the passive precision action parameter control chip drives the GT11 port to output a PWM signal and drives the MOSFET11 to turn on, providing a negative power supply for the negative end of the relay SET coil, driving the relays RL11A and RL12A to act and remain. At this time, the SET external start contact is opened, and when the sampling voltage at the VT11 port is less than the return threshold, the GT11 stops outputting, the MOSFET11 is turned off, and the relay contact does not change due to the opening of the external SET start contact. At this time, the RESET external start contact is closed, providing a positive power supply for the relay RESET coil, and a power supply is also provided for the passive precision relay control chip, and the chip internally completes rapid charging. The input voltage is divided by the RESET voltage dividing circuit and input to the VT21 port. When the voltage at the VT21 port is greater than the set value, the passive precision action parameter control chip drives the GT21 port to output a PWM signal and drives the MOSFET21 to turn on, providing a negative power supply for the negative end of the relay RESET coil, driving the relays RL21A and RL22A to reset, and the contact returns and remains. At this time, the RESET external start contact is opened, and when the sampling voltage at the VT21 port is less than the return threshold, the GT21 stops outputting, the MOSFET21 is turned off, and the relay contact does not change due to the opening of the external RESET start contact.

[0021] To reduce the startup power consumption of the passive precision relay control chip, a diode D15 and a voltage dividing resistor R14 are connected in series at the VIN11 pin in the SET circuit, and a diode D25 and a voltage dividing resistor R24 are connected in series at the VIN21 pin in the RESET circuit.

[0022] In both the action circuit and the reset circuit, after the relay enters the action stage, the GT11 (GT21) outputs a PWM waveform that can ensure reliable action of the relay, reducing the power consumption of the bistable relay and the voltage dividing resistor circuit, achieving low-power operation in the relay action stage, and achieving green operation.

[0023] In order to keep the stability of control, when the VT voltage drops, the chip is provided with a return coefficient, only when the voltage of VT is lower than the return voltage threshold, the PWM will stop outputting and enter the under-voltage protection mode. The chip has stable performance, low VT discrete degree, can accurately set the action value of the relay, and realizes accurate control of the action value. In this way, the discrete degree of the action value of the relay can be effectively controlled.

[0024] For occasions requiring delay control, a capacitor can be connected in parallel with the input end of VT, so as to obtain accurate relay action delay. The delay accuracy is irrelevant to the parameters of the relay itself, but only related to the delay accuracy of the chip and the capacitance value. In this way, the delay accuracy of the relay can be well controlled, and the consistency can be reliably guaranteed.

[0025] Usually in the DC application scene, a DC relay is selected, and in the AC application scene, an AC relay is selected. In order to facilitate design, a rectifier bridge and a filtering scheme are adopted in the front end. Whether it is a DC loop or an AC loop, a DC relay is used. In the AC input loop, the relay works in the starting stage, the input waveform is a steamed bun wave, a diode D15 (D25) and a voltage dividing resistor R14 (R24) need to be connected in series at the input port VIN pin, so as to reduce the starting power consumption of the passive precision relay control chip. At the same time, a thermistor RN1 (RN21) is connected in series and a voltage-dependent resistor RV1 (RV21) is connected in parallel in the loop for double protection, so as to improve the anti-interference ability of the product and meet the EMC four-level requirements of the power industry.

[0026] The above only describes preferred embodiments of the present application, and it should be pointed out that for ordinary skilled persons in the technical field, some improvements and refinements can be made without departing from the principles of the present application. These improvements and refinements should also be considered within the protection scope of the present application.

Claims

1. A bistable relay for controlling a chip with passive precision motion parameters, characterized by that, The action coil loop and the reset coil loop have the same structure, and each of the action coil loop and the reset coil loop comprises a voltage dividing sampling circuit, a passive precision action parameter control chip, a MOSFET and a relay, the voltage dividing sampling circuit samples the voltage at the input end and inputs the voltage to a VT port of the control chip, and a GT port of the passive precision action parameter control chip is connected to a control end of the MOSFET; after the MOSFET is turned on, the relay coil is provided with a negative power supply, and the relay is actuated; the passive precision action parameter control chip has stable performance and low VT discrete degree, can accurately set the action value of the relay, and realizes accurate control of the action values of the action coil and the reset coil.

2. The bistable relay of claim 1, wherein, A capacitor is connected to the VT input end of the passive precision action parameter control chip to obtain accurate delay of the action of the action coil and the reset coil.

3. The bistable relay of claim 1, wherein, The input loop is provided with double protection of series connection of a thermistor and parallel connection of a pressure-sensitive resistor.

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