CN2741246Y

CN2741246Y - Monochip computer controlled shock-proof wall device of drinking machine

Info

Publication number: CN2741246Y
Application number: CN 200420074365
Authority: CN
Inventors: 谭启仁
Original assignee: Individual
Current assignee: Individual
Priority date: 2004-06-23
Filing date: 2004-06-23
Publication date: 2005-11-16
Anticipated expiration: 2014-06-23

Abstract

The utility model relates to an electricity preventing wall device for drinking machines, which is controlled by a single-chip microcomputer and belongs to the technology application field of the single-chip microcomputer, particularly the electricity preventing wall technology which can protect personal safety when an earth wire and the basic insulation of the drinking machine fail simultaneously. The utility model is composed of a null earth wire electrical potential difference detecting device, a central processing unit and a relay executive circuit which are connected in order. The utility model is characterized in that a transformer or a resistance-capacity pressure reducing circuit is arranged between the earth wire and the null wire, and I/O input ports of the single-chip microcomputer are connected through a switching tube. The single-chip microcomputer receives the voltage difference signals between the null wire and the earth wire, and the earth and the power supply of the drinking machine are cut off in real time when the earth wire is provided with electricity. The utility model is suitable for every controlling way of every kind of drinking machine, and the aim of the electricity preventing wall technology provided by the utility model is to protect the personal safety under the condition of unreliable earthing or failed earth wire.

Description

The electricity-preventing wall device that monolithic processor controlled water dispenser is general

Anti-electric wall technology when technical field the invention belongs to microchip technology field and is particularly related to water dispenser heater ground wire and basic insulation and lost efficacy simultaneously.

Background technology is well-known, and it must be reliably that the water dispenser product standard requires the ground connection in the user family, and the standard plug that the band ground wire also is housed in its product is for linking to each other good with assurance ground connection with ground wire in the socket.And in China, power utilization environment is poor, and the ground connection of many buildings is insecure, or even lack.In this case, qualified water dispenser can not guarantee user's safety.The anti-electric wall technology that the invention relates to is special in China's actual conditions, is intended to guarantee under unsafe power utilization environment user's safety.And before the invention applying date, water dispenser does not have the personal safety protector that cut off ground wire and water dispenser heating unit power when ground wire and basic insulation lost efficacy simultaneously in real time, brings potential safety hazard for the user who does not have good earth.

The purpose of summary of the invention the invention is exactly to overcome the shortcoming that the above-mentioned prior art of water dispenser exists, providing a kind of had when this water dispenser heater ground wire and basic insulation lost efficacy simultaneously, can cut off the power supply of ground wire and water dispenser heater in real time, even under dangerous power utilization environment, also can guarantee user's safety.The relay circuit of the invention guarantees that simultaneously water dispenser recovers or do not influence normal use when ground wire is not charged.

The invention solves the technical scheme that its technical problem adopts: the invention is provided with cross-over connection in ground wire E _INAnd the potential difference detecting device between zero line N (1), this device provides ground wire normal or charged logical signal to central processing unit (2) I/O input port, and central processing unit (2) is by the break-make of I/O output port control relay executive circuit.Relay executive circuit (3) is by drive circuit Q ₁, Q ₂And relay J ₁, J ₂Form, be serially connected with ground wire E respectively at its normally-closed contact, normally opened contact _IN, E _OUTAnd water dispenser heating unit power L _IN, L _OUTRelay executive circuit (3) is controlled by central processing unit (2), cuts off being serially connected in relay J when ground wire electrification ₁, J ₂Ground wire and electrical appliance power supply.Under normal circumstances, the relay normally-closed contact is guaranteed ground wire E _IN, E _OUTAnd electrical appliance power supply L _IN, L _OUTConnection.

The advantage of the invention is simple in structure, highly versatile, being suitable for all kinds of water dispensers peaces changes, effect is obvious, does not influence the use under the ground wire normal condition, its central processing unit also can with water dispenser single chip machine controlling circuit shared resource.

Description of drawings Fig. 1 is the circuit structure block diagram of the invention.Wherein (1) is that zero grounding potential difference detector set (2) is central processing unit, and (3) carry out electrical equipment for relay.

Fig. 2 is the electrical schematic diagram of the invention.E among the figure _INBe ground wire end of incoming cables, E _OUTBe the ground wire leading-out terminal, promptly link to each other with water dispenser heater earth terminal; L _INBe live wire end of incoming cables, L _OUTBe the live wire leading-out terminal, promptly link to each other with water dispenser heater live wire end; N is a zero line, and 12V is the 12V DC power supply.

Embodiment the invention embodiment central processing unit adopts PIC16C54 (PIC16C57) chip microprocessor able to programme, and as previously mentioned, this chip microprocessor can be shared with the single chip machine controlling circuit of water dispenser.Cross-over connection is in zero line N and ground wire E _INBetween potential difference detecting device by transformer T or resistance-capacitance circuit R ₁C ₁(among Fig. 2 shown in the dotted line) step-down, D ₁～D ₄Diode rectification, capacitor C _O, voltage-stabiliser tube the DW voltage stabilizing circuit and the switching tube Q that form _OForm switching tube Q _OBe connected in central processing unit I/O input port, I/O output port control relay executive circuit Q ₁, Q ₂, J ₁, J ₂The relay normally-closed contact connects ground wire E _INAnd E _OUT, normally opened contact connects water dispenser heater L _INAnd L _OUT

Operation principle summary: the water dispenser heater under the situation that ground connection and basic insulation lost efficacy simultaneously, zero line N and ground wire E _INBetween voltage between 36V-220V, cross-over connection is in zero line N and ground wire E _INOn transformer reduction voltage circuit or resistance-capacitance depressurization circuit produce the 1.5-6V dc pulse voltage by rectification circuit, make switching tube Q _OConducting is to central processing unit output low level signal.Q in the relay executive circuit ₁, Q ₂Be respectively J ₁, x ₂Drive circuit.When the I/O output makes Q ₁Or Q ₂During for low level, the actuating of relay disconnects the ground wire E that is connected on its normally-closed contact _INAnd E _OUTAnd the L of normally opened contact (being normally-closed contact during work) _INAnd L _OUT

Claims

1, the general electricity-preventing wall device of a kind of monolithic processor controlled water dispenser comprises potential difference detecting device, central processing unit and relay executive circuit; It is characterized in that the potential difference detecting device cross-over connection between ground wire and zero line, and be connected that single-chip microcomputer central processing unit I/O output port is connected with the relay executive circuit with single-chip microcomputer central processing unit I/O input port.

2, the general electricity-preventing wall device of monolithic processor controlled water dispenser according to claim 1, it is characterized in that the potential difference detecting device of cross-over connection between ground wire and zero line is by transformer or resistance-capacitance circuit step-down, diode rectification, electric capacity, voltage-stabiliser tube and switching tube are formed, and the switching tube output is connected with single-chip microcomputer central processing unit I/O input port.

3, the general electricity-preventing wall device of monolithic processor controlled water dispenser according to claim 1, it is characterized in that the single-chip microcomputer central processing unit is a programmable microprocessor, its I/O port is connected with the relay executive circuit with potential difference detecting device respectively, switching tube is controlled by the I/O output port of central processing unit in the described relay executive circuit, relay is controlled by switching tube, and control connection is in the break-make of the ground wire and the heating unit power of relay respectively.

4, the general electricity-preventing wall device of monolithic processor controlled water dispenser according to claim 1, it is characterized in that central processing unit can with the central processing unit shared resource in the water dispenser control circuit.