CN211405583U

CN211405583U - Power supply for metering instrument

Info

Publication number: CN211405583U
Application number: CN201922235157.3U
Authority: CN
Inventors: 高建新; 谭华; 刘婷婷
Original assignee: Goldcard Smart Group Co Ltd
Current assignee: Goldcard Smart Group Co Ltd
Priority date: 2019-12-13
Filing date: 2019-12-13
Publication date: 2020-09-01
Anticipated expiration: 2029-12-13

Abstract

The utility model relates to a metering device power technical field, concretely relates to low-cost metering device power supply. The intelligent anti-backflow power supply is used for civil meters such as gas meters or water meters, a specific power supply comprises a power supply battery, the battery is connected with a main control unit and a valve driving circuit, the front end of the main control unit is connected with a voltage stabilizing chip U3, the front end of a voltage stabilizing chip U3 is connected with a power-down power supply module, and the front end of the power-down power supply module is further connected with an anti-backflow module to prevent the power supply from returning to the power supply module after the power supply fails. The problem of power supply of the valve after power failure of the system can be solved, and meanwhile, the valve has the advantage of saving cost.

Description

Power supply for metering instrument

Technical Field

The utility model relates to a metering device power technical field, concretely relates to low-cost metering device power supply.

Background

The metering instrument is used for metering daily energy such as gas, liquid and the like, is widely applied to thousands of households, is an important appliance for metering resources such as gas, water and the like, can realize a metering function, and also has a function of on-off gas supply. The valve is used as an important device for controlling the on-off of a measured medium, and the working performance of the valve directly influences the working performance of a product. The existing products directly cause economic loss of gas companies and gas safety of users due to unreliable valve performance.

In the existing product, most civil meter meters are powered by traditional dry batteries due to safety requirements, and the batteries have the defects of small battery capacity and short service life. The user needs to change the battery regularly, can lead to the whole operating system of metering device to fall the power among the battery change process, according to the design demand this moment, needs in time to preserve and close the valve operation current strapping table data.

When the existing product is uploaded in data communication or is opened, power-down operation is executed when a battery is replaced, a software query mode is used for judging that a period of time is needed for power failure of a power supply, in order to meet system requirements, a standby battery is usually designed, and during the period of power failure of a main battery, a standby lithium battery is started to maintain normal work of an MCU (microprogrammed control unit), so that a driving valve closing signal is provided for a valve closing circuit, the valve is ensured to be closed in time, and the valve closing function of the system is.

However, in the existing circuit design, the standby battery only provides electric energy for closing the valve, if the metering instrument is powered off in the valve opening process, if the standby lithium battery does not maintain the work of the MCU, a valve closing driving signal cannot be provided, and the valve has the risk of not being closed. Meanwhile, the product cost is improved to a certain extent by adding the standby battery through the existing design. And once the controller panel is damaged, the controller panel can be replaced by detaching the controller panel, and the maintainability is poor.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem, provide a measuring instrument power supply is used for measuring instrument's system power supply, can solve the system and fall the power supply problem of back valve, have the advantage of practicing thrift the cost simultaneously.

Specifically, the utility model discloses the scheme provides a metering device power supply, including power supply battery, main control unit and valve drive circuit are connected to the battery, the main control unit front end is connected with voltage regulation chip U3, voltage regulation chip U3 front end is connected with falls the power supply module, it still is connected with anti-module to fall the power supply module front end to prevent that the power falls behind the electricity and falls the power supply module electric energy and return and irritate.

In a further scheme, the power-down power supply module comprises an electrolytic capacitor C8 and an electrolytic capacitor C9 which are connected in parallel, and the cathodes of the electrolytic capacitor C8 and the electrolytic capacitor C9 are grounded.

In a further scheme, the anti-reverse module is a diode D2, and the cathode of the diode D2 is connected with the anodes of the electrolytic capacitors C8 and C9.

In a further scheme, the rear end of the power failure power supply module is connected with a valve closing drive circuit.

In a further scheme, a switch module is further connected between the power-down power supply module and the valve-closing driving circuit, the switch module comprises a triode Q1 and a triode Q2, an emitting electrode of the triode Q1 is connected with the positive electrode of an electrolytic capacitor C9, a collecting electrode of the triode Q1 is connected with the valve-closing driving circuit, a base set of the triode Q1 is connected with a collecting electrode of a triode Q2, and an emitting electrode of the triode Q2 is grounded.

In a further scheme, the front end of the reverse prevention module is also connected with a valve opening driving circuit, a diode D3 is connected between the valve opening driving circuit and the reverse prevention module, the anode of the diode D3 is connected with the reverse prevention module, and the cathode of the diode D3 is connected with the valve opening driving circuit.

In a further scheme, the battery is connected with a diode D1 and then is connected with the anode of a diode D2 through a voltage stabilizing chip U2.

In a further scheme, the cathode of the diode D1 is also connected with a communication module. The communication module may be NB communication, GPRS communication, or the like.

In a further scheme, a voltage stabilizing chip U1 is connected between the diode D1 and the communication module.

The beneficial effects of this utility scheme lie in:

1. the front end of the voltage stabilizing chip is connected with a power-down power supply module, and the front end of the power-down power supply module is also connected with an anti-reverse module to prevent the power return of the power-down power supply module after the power supply fails. Firstly, a power-down power supply module is added at the front end of the control unit, so that the work of the control unit can be guaranteed after the power supply is powered down, the work of a valve closing driving circuit can be guaranteed, and the valve closing action of a system after the power supply is powered down is guaranteed. Meanwhile, the anti-reverse module is arranged to prevent the power supply from being back-filled after the power supply is powered down, so that the power of the power-down power supply module cannot be transmitted to other places of the system and is only used for closing the valve, and the power supply is ensured.

2. The front end of the reverse prevention module is also connected with a valve opening driving circuit, a diode D3 is connected between the valve opening driving circuit and the reverse prevention module, the positive electrode of the diode D3 is connected with the reverse prevention module, and the negative electrode of the diode D3 is connected with the valve opening driving circuit. The power-down power supply circuit can not supply power to the valve opening driving circuit after the system is powered down, and the valve opening action is prevented.

3. The open valve and the close valve are mutually independent, so that the electric energy for closing the valve cannot be consumed when the open valve is opened, and the sufficiency of the electric energy for closing the valve is ensured.

Drawings

The present invention will be further explained with reference to the accompanying drawings:

FIG. 1 is a block diagram of a power supply system of the metering device of the present invention;

fig. 2 is the power supply circuit schematic diagram of the metering device of the present invention.

Detailed Description

The "front end" and "back end" of this embodiment are defined according to the flowing direction of the electrical signal stream when the system is working normally. For example, a power supply signal for normal operation of the system passes through the diode D2 after passing through the regulator chip U2, and the regulator chip U2 is considered to be located at the front end of the diode D2.

Specific as shown in fig. 1, fig. 2, the utility model discloses the scheme provides a metering device power supply, can be used to the power supply of gas table also can be used for the power supply of water gauge, and specific metering device power supply includes the power supply battery, and the battery is that four dry batteries establish ties also is 6V's power in this embodiment, main control unit and valve drive circuit are connected to the battery, the main control unit front end is connected with voltage stabilizing chip U3, voltage stabilizing chip U3 front end is connected with falls the power supply module, it still is connected with anti-module to fall the power supply module front end to fall the power supply module electric energy and return and irritate after preventing the power supply and fall the power supply. The power-down power supply module comprises an electrolytic capacitor C8 and an electrolytic capacitor C9 which are connected in parallel, and the cathodes of the electrolytic capacitor C8 and the electrolytic capacitor C9 are grounded. The anti-reverse module is a diode D2, and the cathode of the diode D2 is connected with the anodes of the electrolytic capacitor C8 and the electrolytic capacitor C9. And the rear end of the power failure power supply module is connected with a valve closing drive circuit. The power-down power supply circuit is characterized in that a switch module is further connected between the power-down power supply module and the valve closing driving circuit, the switch module comprises a triode Q1 and a triode Q2, an emitting electrode of the triode Q1 is connected with the positive electrode of an electrolytic capacitor C9, a collecting electrode of the triode Q1 is connected with the valve closing driving circuit, a base set of the triode Q1 is connected with a collecting electrode of a triode Q2, and an emitting electrode of the triode Q2 is grounded. The front end of the reverse prevention module is also connected with a valve opening driving circuit, a diode D3 is connected between the valve opening driving circuit and the reverse prevention module, the positive electrode of the diode D3 is connected with the reverse prevention module, and the negative electrode of the diode D3 is connected with the valve opening driving circuit. The battery is connected with a diode D1 and then is connected with the anode of a diode D2 through a voltage stabilizing chip U2. The cathode of the diode D1 is also connected with a communication module. And a voltage stabilizing chip U1 is also connected between the diode D1 and the communication module. In this embodiment, the functions of the voltage stabilization chips U1, U2, and U3 are all DC-DC functions to stabilize the voltage of the power supply, for example, the power supply is changed from 6V to 5V after passing through U2, and is changed from 5V to 3V after passing through U3. In this embodiment, the types of the voltage stabilization chips U1, U2, and U3 may be the same or different.

When the system works, the system supplies power normally, the power supply charges the electrolytic capacitors C8 and C9 under normal conditions and stores electric energy, when the battery is powered OFF due to battery replacement or other reasons, the electrolytic capacitors C8 and C9 discharge, due to the arrangement of the anti-reverse-filling diode D2, the electric energy of the electrolytic capacitors C8 and C9 can only supply power to the control unit and the valve closing driving circuit, the control chip drives the pin MCU-VAL-OFF to conduct the triode Q2, then the triode Q1 is conducted, and the electric energy transmission valve closing driving circuit realizes the closing of the valve. Meanwhile, due to the fact that the anti-reverse diode D2 is arranged, and the valve opening driving circuit is connected to the front end of the diode D2, electric energy cannot be transmitted to the valve opening driving circuit, and the valve cannot be opened after being closed. Other modules of the system cannot be divided into electric energy, and the valve closing is realized by the enough electric energy of the valve closing driving circuit.

The utility model discloses still left out the stand-by battery in the current design, realized the reduction of cost, and maintained the degree of difficulty, had the advantage of practicing thrift the cost.

In addition to the preferred embodiments described above, other embodiments of the present invention are also possible, and those skilled in the art can make various changes and modifications according to the present invention without departing from the spirit of the present invention, which should fall within the scope of the present invention defined by the appended claims.

Claims

1. The utility model provides a metering device power supply, includes the power supply battery, main control unit and valve drive circuit are connected to the battery, its characterized in that: the front end of the main control unit is connected with a voltage stabilizing chip U3, the front end of the voltage stabilizing chip U3 is connected with a power-down power supply module, and the front end of the power-down power supply module is also connected with an anti-reverse module to prevent the power return of the power-down power supply module after the power supply is powered down.

2. The power supply for a metering device of claim 1 wherein: the power-down power supply module comprises an electrolytic capacitor C8 and an electrolytic capacitor C9 which are connected in parallel, and the cathodes of the electrolytic capacitor C8 and the electrolytic capacitor C9 are grounded.

3. The power supply for a metering device of claim 2 wherein: the anti-reverse module is a diode D2, and the cathode of the diode D2 is connected with the anodes of the electrolytic capacitor C8 and the electrolytic capacitor C9.

4. The power supply for a metering device of claim 1 wherein: and the rear end of the power failure power supply module is connected with a valve closing drive circuit.

5. The power supply of a metering device of claim 4 wherein: the power-down power supply circuit is characterized in that a switch module is further connected between the power-down power supply module and the valve closing driving circuit, the switch module comprises a triode Q1 and a triode Q2, an emitting electrode of the triode Q1 is connected with the positive electrode of an electrolytic capacitor C9, a collecting electrode of the triode Q1 is connected with the valve closing driving circuit, a base set of the triode Q1 is connected with a collecting electrode of a triode Q2, and an emitting electrode of the triode Q2 is grounded.

6. The power supply for a metering device of claim 1 wherein: the front end of the reverse prevention module is also connected with a valve opening driving circuit, a diode D3 is connected between the valve opening driving circuit and the reverse prevention module, the positive electrode of the diode D3 is connected with the reverse prevention module, and the negative electrode of the diode D3 is connected with the valve opening driving circuit.

7. The power supply of a metering device of claim 3 wherein: the battery is connected with the diode D1 and then is connected with the anode of the diode D2 through the voltage stabilizing chip U2.

8. The power supply for a metering device of claim 7 wherein: the cathode of the diode D1 is also connected with a communication module.

9. The power supply for a metering device of claim 8 wherein: and a voltage stabilizing chip U1 is also connected between the diode D1 and the communication module.