CN202119820U

CN202119820U - Electric energy meter capable of detecting uncapping in power cut state

Info

Publication number: CN202119820U
Application number: CN2011202244981U
Authority: CN
Inventors: 贾燕生; 刘衡; 田仲平; 吴斌
Original assignee: SHENZHEN WISMEI TECHNOLOGY CO LTD
Current assignee: SHENZHEN WISMEI TECHNOLOGY CO LTD
Priority date: 2011-06-29
Filing date: 2011-06-29
Publication date: 2012-01-18
Anticipated expiration: 2021-06-29

Abstract

The utility model discloses an electric energy meter capable of detecting uncapping in a power cut state, which comprises an end cap, an internal single chip microcomputer, an interrupted awaking port and a grounding resistor, and is characterized by further comprising an end cap detecting switch, one end of the end cap detecting switch is connected with the interrupted awaking port and the grounding resistor, the other end of the end cap detecting switch is connected with a power source [VBAT (voltage of battery)], the end cap detecting switch is mounted at the position of the end cap and is switched on when the end cap is opened in the power cut state, and the single chip microcomputer is awaked for confirming and recording uncapping relevant events. The electric energy meter enables uncapping to be detected timely, can record date and time of uncapping occurring in the power cut state, and is not limited by power cut time and capable of effectively meeting requirements of electric power departments. A super capacitor and charge-discharge circuits on the periphery of the super capacitor are omitted, and accordingly device varieties are decreased while cost is reduced, and distribution of a PCB (printed circuit board) is more convenient.

Description

Can under power down mode, detect the electric energy meter of uncapping

Technical field

The utility model relates to a kind of anti-electricity-theft electric energy meter.

Background technology

Along with rapid development of economy, human more and more to demands for energy, the energy is also just more and more precious,

It is requisite when wherein electric energy is people's daily life and all trades and professions production.A few peoples to be arranged in order paying tariff less in some zone, to have used various electricity filching means, caused loss to country.Many stealing modes all are earlier to take the ammeter of scene operation apart end cap, and then illegal table internal wiring mode and the components and parts of changing, and recover original-pack to the ammeter end cap again, reach to let ammeter measure less to let again simultaneously power department purpose inconspicuous.

Each power department has all proposed many anti-electricity-theft technical requirements to electric energy meter when the buying electric energy meter at present.Electric energy meter on the market has also all possessed the function of beginning lid warning and logout basically; But great majority are just can not realize this function in power failure, the ammeter operate as normal, and are then powerless for the beginning lid electricity filching behavior that under having a power failure, takes place.

The exploitation of minority electric energy meter, manufacturing enterprise have released the electric energy meter that can detect the beginning lid situation that under having a power failure, takes place; Testing circuit is seen shown in Figure 2, and sort circuit mainly is a charge storage of having utilized super capacitor and discharge and recharge function, when electric energy meter when the civil power operate as normal is arranged; Power supply charges to super capacitor in the table; If end cap is opened under having a power failure, then can causes end cap switch S 1 closure on the circuit board, thereby make the super capacitor discharge; When sent a telegram here next time by the time, the single-chip microcomputer in the electric energy meter just can be judged the beginning lid situation that taken place through port V3.But sort circuit has significant limitation, it is longer that at first super capacitor discharges and recharges the time, has caused delay that single-chip microcomputer judges and untimely; The 2nd, the beginning lid that has a power failure and take place down can't write down the time on date at that time; The 3rd, super capacitor has characteristics such as self discharge, and power off time is long, and super capacitor also can have been put electricity, and whether end cap was opened single-chip microcomputer therebetween with regard to no longer judgement has a power failure when sent a telegram here next time, in order to avoid erroneous judgement; The 4th, the components and parts cost is higher.

The utility model content

The purpose of the utility model is the deficiency to existing electrical energy meter anti-theft electricity, beginning lid detection, provides a kind of power down mode with better function, that accommodation is wider, cost is lower, device resource makes full use of to detect the electric energy meter of uncapping down.

The utility model provides thisly can detect the electric energy meter of uncapping under power down mode; Comprise single-chip microcomputer in end cap, the table, interrupt waking up port and stake resistance; It is characterized in that also comprising the end cap detector switch, an end of this end cap detector switch wakes port up with the interruption of electric energy meter and is connected with stake resistance, and the other end of end cap detector switch is connected with power supply (VBAT); This end cap detector switch is installed in end caps; The end cap detector switch was connected when the end cap that is used to have a power failure was uncapped, and woke single-chip microcomputer up, the affirmation of the dependent event of uncapping and record.

Said power supply (VBAT) produces primary power (V3P3) by the power circuit in the electric energy meter and provides or provided by battery.

Because the utility model has made full use of device resource; The beginning lid is detected in time; The beginning that also can writing down has a power failure takes place is down covered the time on date at that time, and does not receive the restriction of power off time length, can well satisfy the requirement of power department; Owing to removed super capacitor and peripheral charge-discharge circuit thereof, make also when having reduced cost therefore that part category reduces, the PCB layout is convenient.

Description of drawings

Fig. 1 is the circuit diagram that detects the electric energy meter of uncapping under the utility model power down mode.

Fig. 2 is the circuit diagram that existing electric energy meter detects the electric energy meter of uncapping.

Embodiment

The utility model comprises single-chip microcomputer and end cap detector switch S1 in end cap, the table, and end cap detector switch S1 is installed in end caps.The end that can know end cap detector switch S1 from Fig. 1 wakes port PB up with the interruption of electric energy meter and is connected with stake resistance R8, and the other end of end cap detector switch is connected with power supply VBAT.Power supply VBAT is provided by the generation of the power circuit in electric energy meter primary power V3P3 or battery provides, and adopts mains-supplied when at ordinary times civil power being arranged, and does not use battery; To prolong battery serviceable life; After outside civil power power down, adopt powered battery, for single-chip microcomputer provides power supply.

The concrete working method of the utility model is following:

When outside civil power was added on the electric energy meter, the power circuit in the electric energy meter produced primary power V3P3, and V3P3 is input to the VBAT port of single-chip microcomputer.End cap covers when tight at ordinary times, and the end cap detector switch breaks off, and the PB input port of single-chip microcomputer is a low level.When end cap was opened, the end cap detector switch was closed at once, and the PB port of single-chip microcomputer becomes high level, and single-chip microcomputer can inquire at once, and then record and warning.End cap lid is tight at ordinary times, and after outside civil power power down, the power circuit in the electric energy meter does not have primary power V3P3, and at this moment, microcontroller power supply is provided by battery, and single-chip microcomputer is in sleep state to save the energy content of battery, and VBAT is a high level always.The PB input port of single-chip microcomputer has the interruption arousal function.If this moment, end cap under power down mode was opened; The end cap detector switch is closed at once, and the PB input port of single-chip microcomputer becomes high level, and the variation of this level is a rising edge; Can wake single-chip microcomputer up; After single-chip microcomputer is reaffirmed end cap switch and PB level, note at that time time on date and mark, continue sleep.When incoming call next time, single-chip microcomputer just sent sound and light alarm, and the tripping relay, and prompting was opened at the power down mode bottom end cover, and can inquire information such as at that time time on date, number of times.

Claims

1. an ability detects the electric energy meter of uncapping under power down mode; Comprise single-chip microcomputer in end cap, the table, interrupt waking up port and stake resistance; It is characterized in that also comprising the end cap detector switch, an end of this end cap detector switch wakes port up with the interruption of electric energy meter and is connected with stake resistance, and the other end of end cap detector switch is connected with power supply (VBAT); This end cap detector switch is installed in end caps; The end cap detector switch was connected when the end cap that is used to have a power failure was uncapped, and woke single-chip microcomputer up, the affirmation of the dependent event of uncapping and record.

2. according to claim 1ly can under power down mode, detect the electric energy meter of uncapping, it is characterized in that said power supply (VBAT) produces primary power (V3P3) by the power circuit in the electric energy meter and provides or provided by battery.