CN108831798B - Magnetic latching relay driving device for intelligent ammeter - Google Patents
Magnetic latching relay driving device for intelligent ammeter Download PDFInfo
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- CN108831798B CN108831798B CN201810725601.7A CN201810725601A CN108831798B CN 108831798 B CN108831798 B CN 108831798B CN 201810725601 A CN201810725601 A CN 201810725601A CN 108831798 B CN108831798 B CN 108831798B
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- 239000003990 capacitor Substances 0.000 description 11
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
- H01H47/02—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay
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Abstract
The invention belongs to the technical field of relay driving circuits, and relates to a magnetic latching relay driving device for an intelligent ammeter, wherein a main structure comprises a Control chip UW1, a load switch REWL1, a micro Control unit MCU, a power end RVCC, a power end MHVDD, a resistor RW1, a resistor RW2 and a resistor RW3, the magnetic latching relay driving device has the advantages of high voltage resistance, large driving current and stable performance, a TVS (transient voltage Control) tube can be eliminated, the resistor RW1, the resistor RW2 and the resistor RW3 all adopt current limiting resistors, a 7 th pin and an 8 th pin of the micro Control unit MCU respectively transmit a closing Control signal connector_on_control and a tripping Control signal connector_off_control to an A end and a B end of the Control chip UW1, and the OA end and the OB end of the Control chip UW1 respectively transmit a closing Control signal connector_on_control and a tripping Control signal connector_off_control to a closing Control signal input end and a tripping Control signal input end of the load switch REWL1, and the load switch RE1 performs a closing action or tripping action; the circuit has the advantages of simple structure, high reliability and integration, less element number, low design difficulty and low cost.
Description
Technical Field
The invention belongs to the technical field of relay driving circuits, relates to a magnetic latching relay driving device for an intelligent ammeter, provides a thought for a switching power supply scheme with wide input and high reliability, and is suitable for three-phase meters and terminal occasions with too high input voltage in a transformer area.
Background
A relay (english name) is an electric control device, and is an electric appliance that generates a predetermined step change in a controlled variable in an electric output circuit when a change in an input variable (excitation variable) reaches a predetermined requirement. It has an interactive relationship between the control system (also called input loop) and the controlled system (also called output loop). It is commonly used in automated control circuits and is actually an "automatic switch" that uses a small current to control the operation of a large current. Therefore, the circuit plays roles of automatic regulation, safety protection, circuit switching and the like. The magnetic latching relay is used as one of relays, and has automatic on-off function to a circuit, unlike a common electromagnetic relay, the normally-closed normally-open function of the magnetic latching relay is completely dependent on the function of permanent magnet steel, and the switching state is switched by triggering a certain amount of pulse electric signals. Therefore, the magnetic latching relay has the characteristics of electricity saving, environment friendliness, stable performance, small volume and large bearing capacity, and is superior to an electromagnetic relay in performance. The existing driving circuit of the magnetic latching relay mostly consists of a diode, a triode, a resistor and a capacitor, for example: the driving circuit of the magnetic latching relay disclosed in China patent 201720942218.8 comprises a control circuit connected to the output end of a driving chip, wherein the input end of the driving chip is connected with a singlechip, the control circuit comprises a triode connected to the driving chip, the output end of the driving chip is connected with the base electrode of the triode, the collector electrode of the triode is connected with a +15V power supply, the emitter electrode of the triode is connected with one end of a magnetic latching coil through an electrolytic capacitor, and the other end of the magnetic latching coil is grounded; the low-power consumption magnetic latching relay driving circuit disclosed in China patent 201721234952.5 comprises a first driving chip, a delay module and a second driving chip, wherein the output end of the first driving chip is connected with a first branch and a second branch, the delay module and the second driving chip are sequentially arranged on the first branch, the first branch is connected with the S end of a relay coil, the second branch is connected with the R end of the relay coil, and push-pull circuits for outputting high-power alternating current signals are integrated in the first driving chip and the second driving chip; the driving circuit of the magnetic latching relay disclosed in China patent 201220065737.8 comprises an H-bridge driving circuit consisting of 2 NPN triodes and 2 PNP triodes, wherein one end of the H-bridge driving circuit is connected with a power supply, the other end of the H-bridge driving circuit is grounded, the driving circuit further comprises a first switching triode and a second switching triode, the base electrode of the first switching triode is connected with a first signal end, the collector electrode and the emitter electrode of the first switching triode are connected between one side driving end of the H-bridge driving circuit and the ground in series, the base electrode of the second switching triode is connected with a second signal end, and the collector electrode and the emitter electrode of the second switching triode are connected between the other side driving end of the H-bridge driving circuit and the ground in series; the magnetic latching relay driving circuit for the three-phase electric energy meter disclosed in Chinese patent 201220153251.X comprises composite triodes U1-U5, resistors R1-R14, composite diodes D1 and D2, an electrolytic capacitor C1 and a capacitor C2; the 1 pin and the 4 pin of the composite triode U3 are connected to a voltage VCC, the 2 pin and the 5 pin of the composite triode U3 are respectively connected to the voltage VCC through resistors R7 and R10, and the 3 pin and the 6 pin of the composite triode U3 are respectively connected to GND through resistors R13 and R14; the 6 pin of the composite triode U3 is connected to the 2 pin of the composite triode U4 through a resistor R1, the 6 pin of the composite triode U3 is connected to the 5 pin of the composite triode U4 through a resistor R6, the 1 pin and the 4 pin of the composite triode U4 are connected to the GND pin of the composite triode U4, the 3 pin of the composite triode U4 is connected to the 5 pin of the composite triode U2 through a resistor R2, the 3 pin of the composite triode U4 is connected to the 2 pin of the composite triode U2 through a resistor R3, the 1 pin and the 4 pin of the composite triode U2 are connected to the VCC pin, the 3 pin and the 6 pin of the composite triode U2 are connected, the 3 pin of the composite triode U2 is connected to the 2 pin of the composite triode U1 through a resistor R5, the 1 pin and the 4 pin of the composite triode U1 are connected to the VCC pin, and the 3 pin and the 6 pin of the composite triode U2 are connected to the VCC pin of the composite triode U4; the 3 pin of the composite triode U3 is connected to the 5 pin of the composite triode U5 through a resistor R11, the 3 pin of the composite triode U3 is connected to the 2 pin of the composite triode U5 through a resistor R12, the 1 pin and the 4 pin of the composite triode U5 are connected to GND, and the 3 pin and the 6 pin of the composite triode U5 are connected and connected with the 3 pin of the composite triode U2; the magnetic latching relay driving circuit disclosed in China patent 201220265062.1 comprises a connecting circuit formed by interconnecting a relay and an MCU control chip in an electronic electric energy meter, wherein the connecting circuit comprises a level conversion circuit and a negative voltage relay driving circuit which are mutually connected, the MCU control chip and the relay driving circuit are respectively connected with a positive direct current power supply and a negative direct current power supply which are obtained after positive half-cycle rectification and voltage stabilization of a transformer output power supply, the level conversion circuit comprises triodes Q4 and Q4a, resistors R1, R1a, R2 and R2a, and the negative voltage relay driving circuit comprises resistors R3, R3a, R4 and R4a, and triodes Q1, Q1a, Q2a, Q3 and Q3a; the driving circuit of the magnetic latching relay disclosed in China patent 201420730057.2 comprises a driving signal input end, polar capacitors C1 and C2 and switches K1 and K2, wherein the capacitor C1 and the capacitor C2 are connected in series, direct-current voltage is applied between the capacitor C1 and the capacitor C2, a contact point between the capacitor C1 and the capacitor C2 is connected with one end of a coil of a relay RY1, the other end of the coil of the relay RY1 is connected with a high voltage end of the direct-current voltage through the switch K1 and is connected with a low voltage end of the direct-current voltage through the switch K2, the driving signal input end is respectively connected with a control end of the switch K1 and a control end of the switch K2, the driving signal input end inputs a driving signal to control the switch K1 to be turned from being turned into being turned off, and the switch K2 is turned on at the same time when the switch K1 is turned off; the improved magnetic latching relay driving circuit of the electric energy meter disclosed in China patent 201020245700.4 comprises switching triodes, a current limiting resistor and a pull-down resistor, wherein the switching triodes form a bridge driving circuit, the current limiting resistor and the pull-down resistor are connected in parallel and then are connected with the base electrode of the switching triodes, and a diode is connected between the collector electrode and the emitter electrode of each switching triode in parallel, so that reverse current flows through the diode. All have the component that adopts more, the design is comparatively complicated, and the component cost is higher, and the PCB (printed circuit board) board cloth board area that the component is more and lead to is big, has taken up the originally limited space of ammeter to the degree of difficulty in the layout space in the design ammeter has been increased.
The schematic diagram of the relay driving circuit in the prior art is shown in fig. 1, and the relay driving circuit consists of a signal input port, a driving circuit and a signal output port. The signal input ports comprise a normally open contact input port (connector_on_control) of the relay and a normally closed contact input port (connector_off_control) of the relay; the normally open contact input port of the relay is connected to the base electrode of a first NPN triode (QW 31) through a first current limiting resistor (RW 32), and the base electrode of the first NPN triode (QW 31) is connected to a first pull-down resistor (RW 33); the normally-closed contact input port of the relay is connected to the base electrode of a second NPN triode (QW 33) through a fourth current limiting resistor (RW 36), and the base electrode of the second NPN triode (QW 33) is connected to a second pull-down resistor (RW 37); the driving circuit comprises a normally open contact input driving circuit and a normally closed contact input driving circuit. The normally open contact input driving circuit is formed by connecting a collector electrode of a first NPN triode (QW 31) to a base electrode of a second PNP triode (QW 32) through a second current limiting resistor (RW 35). The emitter of the second PNP triode (QW 32) is connected with the positive electrode (RVCC) of the power supply, and the collector is connected with the signal output port (connector_off_in). An emitter of the first NPN triode (QW 31) is connected with a power supply negative electrode (GND); the normally-closed contact input driving circuit is connected to the base electrode of the first PNP triode (QW 30) through a third current limiting resistor (RW 31) by the collector electrode of the second NPN triode (QW 33). The emitter of the first PNP triode (QW 30) is connected with the positive electrode (RVCC) of the power supply, the collector is connected with the signal output port (connector_on_in), and the emitter of the second NPN triode (QW 33) is connected with the negative electrode (GND) of the power supply; the signal output port comprises a connector_on_in input end and a connector_off_in input end, and the connector_on_in input end is connected with the collector electrode of the first NPN triode (QW 31); the connector_off_in input is terminated at the collector of the second NPN triode (QW 33); in addition, the peak voltage is discharged to a relay output port (REW 1) through a TVS tube (DW 33), so that a relay coil is protected; the voltage amplitudes at the connector_on_in output and the connector_off_in output are limited by diodes DW31 and DW32, protecting the transistors of the drive circuit. The reliability model can show that the components among the modules and in the modules of the predicted product are of a reliable serial structure, when the life distribution of each module is exponential distribution, the life of the system also obeys the exponential distribution, the total failure rate lambda s of the system is the sum of the failure rates of each module, and the mathematical model is expressed as follows:
the failure rate prediction model of the components is as follows:wherein: />Is the expected value of the failure rate of work; />Is the basic failure rate; />Respectively, are substances influencing failure rateA series of correction coefficients such as a quantity factor, an environmental factor, a temperature factor, an electric stress factor and the like;
the reliability mathematical model of the system is as follows:wherein: />Is the total failure rate; />The failure rate of the operation of the jth component of the ith module unit; n is the number of module units representing product division; mi is the total number of components representing the ith module unit;
MTTF refers to the average on-time before a product fails, referred to as the average no-failure on-time:。
in general, the smaller the total number of components, the lower the failure rate and the higher the reliability. Therefore, the magnetic latching relay driving device for the intelligent ammeter, which has high integration level and small number of elements, is developed and designed to reduce cost, has good social value and economic benefit and has wide application prospect.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and the technical problems of a relay control circuit of a discrete device, and designs a magnetic latching relay driving device for a smart electric meter, which reduces design difficulty and cost, reduces layout area and improves reliability of circuits and products on the premise of higher integration level and less number of elements.
In order to achieve the above object, the main structure of the magnetic latching relay driving device for a smart meter according to the present invention includes a control chip UW1, a load switch REWL1, a micro control unit MCU, a power supply terminal RVCC, a power supply terminal MHVDD, a resistor RW1, a resistor RW2, and a resistor RW3; the load switch REWL1 comprises a closing control signal input end and a tripping control signal input end; the main body structure of the control chip UW1 comprises an OB end, a GND end, an A end, an OA end, a VDD end and a B end, wherein the OB end of the control chip UW1 is electrically connected with a tripping control signal input end of a load switch REWL1, the GND end of the control chip UW1 is grounded, the A end of the control chip UW1 is connected with a 7 th pin of a micro control unit MCU, a resistor RW1 is connected in series between the A end of the control chip UW1 and the 7 th pin of the micro control unit MCU, the OA end of the control chip UW1 is connected with a closing control signal input end of the load switch REWL1, the VDD end of the control chip UW1 is connected with a power end MHVDD through a power end RVCC, a resistor RW3 is connected in series between the power end RVCC and the power end MHVDD, the B end of the control chip UW1 is connected with an 8 th pin of the micro control unit MCU, and a resistor RW2 is connected in series between the B end of the control chip UW1 and the 8 th pin of the micro control unit MCU.
The control chip UW1 is a relay driving chip AL868, is integrated with a high-speed follow current diode, has the advantages of high voltage resistance, high driving current and stable performance, and can cancel a TVS (transient voltage suppression) tube; the resistors RW1, RW2 and RW3 are current limiting resistors.
When the magnetic latching relay driving device for the intelligent ammeter is used, the 7 th pin of the MCU transmits a closing Control signal connector_on_control to the A end of the Control chip UW1, the OA end of the Control chip UW1 transmits the closing Control signal connector_on_control to the closing Control signal input end of the load switch REWL1, and the load switch REWL1 performs closing action; the 8 th pin of the micro Control unit MCU transmits a tripping Control signal connector_off_control to the B end of the Control chip UW1, the OB end of the Control chip UW1 transmits the tripping Control signal connector_off_control to the tripping Control signal input end of the load switch REWL1, and the load switch REWL1 performs tripping operation.
Compared with the prior art, the Control chip UW1 uses the relay driving chip AL868, integrates the high-speed freewheeling diode, has the advantages of high clamping reverse voltage function, high withstand voltage, high driving current and stable performance, can cancel the TVS tube, the resistors RW1, RW2 and RW3 adopt current limiting resistors, the 7 th pin and the 8 th pin of the micro Control unit MCU respectively transmit a closing Control signal connector_on_control and a tripping Control signal connector_off_control to the A end and the B end of the Control chip UW1, the OA end and the OB end of the Control chip UW1 respectively transmit a closing Control signal connector_on_control and a tripping Control signal connector_off_control to the closing Control signal input end and the tripping Control signal input end of the load switch REWL1, and the load switch REWL1 carries out closing action or tripping action; the circuit has the advantages of simple structure, high reliability and integration, less element number, low design difficulty and cost and small occupied cloth surface area.
Drawings
Fig. 1 is a schematic diagram of a driving circuit structure of a relay according to the prior art.
Fig. 2 is a schematic circuit diagram of a relay driving device according to the present invention.
Detailed Description
The invention is further described below by way of examples and with reference to the accompanying drawings.
Examples
The main structure of the magnetic latching relay driving device for the intelligent ammeter comprises a control chip UW1, a load switch REWL1, a micro control unit MCU, a power supply end RVCC, a power supply end MHVDD, a resistor RW1, a resistor RW2 and a resistor RW3; the load switch REWL1 comprises a closing control signal input end and a tripping control signal input end; the main body structure of the control chip UW1 comprises an OB end, a GND end, an A end, an OA end, a VDD end and a B end, wherein the OB end of the control chip UW1 is electrically connected with a tripping control signal input end of a load switch REWL1, the GND end of the control chip UW1 is grounded, the A end of the control chip UW1 is connected with a 7 th pin of a micro control unit MCU, a resistor RW1 is connected in series between the A end of the control chip UW1 and the 7 th pin of the micro control unit MCU, the OA end of the control chip UW1 is connected with a closing control signal input end of the load switch REWL1, the VDD end of the control chip UW1 is connected with a power end MHVDD through a power end RVCC, a resistor RW3 is connected in series between the power end RVCC and the power end MHVDD, the B end of the control chip UW1 is connected with an 8 th pin of the micro control unit MCU, and a resistor RW2 is connected in series between the B end of the control chip UW1 and the 8 th pin of the micro control unit MCU.
The control chip UW1 related to the embodiment is a relay driving chip AL868, is integrated with a high-speed freewheeling diode, has the advantages of a clamping reverse voltage function, high withstand voltage, large driving current and stable performance, and can cancel a TVS tube; the resistors RW1, RW2 and RW3 are current limiting resistors.
When the magnetic latching relay driving device for the smart meter according to the embodiment is used, the 7 th pin of the micro Control unit MCU transmits a closing Control signal connector_on_control to the A end of the Control chip UW1, the OA end of the Control chip UW1 transmits the closing Control signal connector_on_control to the closing Control signal input end of the load switch REWL1, and the load switch REWL1 performs closing operation; the 8 th pin of the micro Control unit MCU transmits a tripping Control signal connector_off_control to the B end of the Control chip UW1, the OB end of the Control chip UW1 transmits the tripping Control signal connector_off_control to the tripping Control signal input end of the load switch REWL1, and the load switch REWL1 performs tripping operation.
Claims (2)
1. The magnetic latching relay driving device for the intelligent ammeter is characterized in that the main structure comprises a control chip UW1, a load switch REWL1, a micro control unit MCU, a power supply end RVCC, a power supply end MHVDD, a resistor RW1, a resistor RW2 and a resistor RW3; the load switch REWL1 comprises a closing control signal input end and a tripping control signal input end; the main body structure of the control chip UW1 comprises an OB end, a GND end, an A end, an OA end, a VDD end and a B end, wherein the OB end of the control chip UW1 is electrically connected with a tripping control signal input end of a load switch REWL1, the GND end of the control chip UW1 is grounded, the A end of the control chip UW1 is connected with a 7 th pin of a micro control unit MCU, a resistor RW1 is connected in series between the A end of the control chip UW1 and the 7 th pin of the micro control unit MCU, the OA end of the control chip UW1 is connected with a closing control signal input end of the load switch REWL1, the VDD end of the control chip UW1 is connected with a power end MHVDD through a power end RVCC, a resistor RW3 is connected in series between the power end RVCC and the power end MHVDD, the B end of the control chip UW1 is connected with an 8 th pin of the micro control unit MCU, and a resistor RW2 is connected in series between the B end of the control chip UW1 and the 8 th pin of the micro control unit MCU; when the micro Control unit MCU is used, the 7 th pin of the micro Control unit MCU transmits a closing Control signal connector_on_control to the A end of the Control chip UW1, the OA end of the Control chip UW1 transmits the closing Control signal connector_on_control to the closing Control signal input end of the load switch REWL1, and the load switch REWL1 performs closing operation; the 8 th pin of the micro Control unit MCU transmits a tripping Control signal connector_off_control to the B end of the Control chip UW1, the OB end of the Control chip UW1 transmits the tripping Control signal connector_off_control to the tripping Control signal input end of the load switch REWL1, and the load switch REWL1 performs tripping operation.
2. The magnetic latching relay driving device for the intelligent ammeter according to claim 1, wherein the control chip UW1 is a relay driving chip AL868, is integrated with a high-speed freewheel diode, has the advantages of a clamping reverse voltage function, high withstand voltage, large driving current and stable performance, and can cancel a TVS tube; the resistors RW1, RW2 and RW3 are current limiting resistors.
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| CN201810725601.7A CN108831798B (en) | 2018-07-04 | 2018-07-04 | Magnetic latching relay driving device for intelligent ammeter |
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| CN201810725601.7A CN108831798B (en) | 2018-07-04 | 2018-07-04 | Magnetic latching relay driving device for intelligent ammeter |
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| CN108831798B true CN108831798B (en) | 2023-12-08 |
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| CN109412570A (en) * | 2018-11-26 | 2019-03-01 | 深圳和而泰智能控制股份有限公司 | A kind of switch driving circuit, controller and electronic equipment |
| CN112748690A (en) * | 2021-01-07 | 2021-05-04 | 朱丽萍 | Magnetic latching relay drive circuit for medical equipment |
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| US6784629B2 (en) * | 2002-08-26 | 2004-08-31 | Sang J. Choi | Dual function solid state relay |
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| JP2008210638A (en) * | 2007-02-26 | 2008-09-11 | Matsushita Electric Works Ltd | Switch and automatic photoelectric flashing device |
| CN101127282A (en) * | 2007-06-08 | 2008-02-20 | 西安交通大学 | Intelligent AC contactor control unit based on current-variable control |
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