CN2359623Y - Electric water heater with earth leakage protective device - Google Patents
Electric water heater with earth leakage protective device Download PDFInfo
- Publication number
- CN2359623Y CN2359623Y CN 98250102 CN98250102U CN2359623Y CN 2359623 Y CN2359623 Y CN 2359623Y CN 98250102 CN98250102 CN 98250102 CN 98250102 U CN98250102 U CN 98250102U CN 2359623 Y CN2359623 Y CN 2359623Y
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- CN
- China
- Prior art keywords
- triode
- microcomputer
- resistance
- coil
- protective device
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- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The utility model relates to an electric water heater, which especially overcomes the defect that the existing electric water heater is not easy to discover the faults of leakage protectors. The utility model comprises a water tank, a main circuit and a control circuit, wherein, the control circuit comprises a leakage protector, an amplifier, a comparator, a microcomputer and an executive circuit, wherein, the leakage protector has a self-inspection coil which is connected with a power supply; the microcomputer controls the power supply of the self-inspection coil to be switched on and switched off. The executive circuit is connected with the microcomputer; the execution circuit controls a power supply of the main circuit to be switched on and switched off. The utility model continuously carries out self-inspection to the leakage protector, and is capable of discovering the faults of the leakage protector. The utility model has the advantage of safe use.
Description
The utility model relate to a kind of for shower, wash one's face and rinse one's mouth and other washing provides the electric heater of hot water.
Electric heater comprises water tank and electric heating system, and electric heating system generally adopts the 220V alternating current that the water in the water tank is heated.In case in use leak electricity, just might cause the user to get an electric shock, even cause personal injury.Therefore, existing electric heater generally all is equipped with earth leakage protective device.But these earth leakage protective devices break down easily, might not shield when producing electric leakage.So existing electric heater still has electric leakage to produce the possibility of getting an electric shock in use.
The purpose of this utility model is that a kind of electric heater that can carry out self check to earth leakage protective device is provided.
This product is to realize like this with novel purpose, the electric heater of band earth leakage protective device comprises water tank and electric heating system, and electric heating system is made up of main circuit and control circuit, its special character is that control circuit comprises earth leakage protective device, amplifier, comparator, microcomputer and executive circuit; Earth leakage protective device is connected with zero line with the live wire of main circuit; The magnetic test coil of earth leakage protective device is connected with amplifier input terminal, and the output of amplifier is connected with the input of comparator, and the output of comparator is connected with microcomputer; Earth leakage protective device also has the self check coil, and the self check coil is connected with power supply, the switching on and off of the power supply of microcomputer control self check coil; Executive circuit is connected with microcomputer, the switching on and off of the power supply of executive circuit control main circuit.
Earth leakage protective device is connected with zero line with the live wire of main circuit respectively; if main circuit does not have leaky; then flowing to the electric current of live wire and the electric current of outflow zero line should equate; equal and opposite in direction, the direction in the magnetic field that the electric current of live wire and the electric current of zero line produce in earth leakage protective device respectively are opposite; total magnetic field is zero in earth leakage protective device, so there is not induced electromotive force to produce in magnetic test coil.If main circuit produces leaky, the electric current that then flows to live wire is unequal with the electric current that flows out zero line, produces magnetic field in the earth leakage protective device, produces induced electromotive force in magnetic test coil.When the self check coil has electric current to flow through, can simulate leaky, in earth leakage protective device, produce magnetic field, make and produce induced electromotive force in the magnetic test coil.Amplifier is used for the signal of telecommunication of magnetic test coil output is amplified.Voltage signal and a fixed voltage that comparator is used for pair amplifier output compare, and export a high level or low level.The microcomputer working procedure receives the output signal of comparator, and this signal is carried out analysis and judgement; Send control signal to the self check coil at interval by certain hour, the simulation leaky; Send control signal to executive circuit, be switched on or switched off the power supply of main circuit by executive circuit.
One end and the resistance R of self check coil of the present utility model
5An end connect resistance R
5The other end be connected with positive source; The other end of self check coil and triode N
2Colelctor electrode connect triode N
2Grounded emitter, triode N
2Base stage and resistance R
4An end connect resistance R
4The other end be connected with the I/O mouth of microcomputer.
Triode N
2Be a switch triode, it is equivalent to one by micro-processor controlled switch.Triode N
2The power supply of self check coil is switched on during conducting.Triode N
2When ending, the power supply of self check coil is disconnected.
Executive circuit of the present utility model comprises triode N
1, triode P and relay K; Triode N
1Base stage and resistance R
2An end connect resistance R
2The other end be connected triode N with the I/O mouth of microcomputer
1Grounded emitter, colelctor electrode and resistance R
3An end connect; Resistance R
3The other end be connected with the base stage of triode P, the emitter stage of triode P is connected with positive source, colelctor electrode is connected with an end of the coil of relay K; An end and the resistance R of the other end of the coil of relay K and thermal fuse-link S
1An end connect the other end ground connection of thermal fuse-link S; Resistance R
1The other end and the I/O mouth and the voltage-stabiliser tube Z of microcomputer
1An end connect voltage-stabiliser tube Z
1Other end ground connection; The normally opened contact K-1 of relay K is connected in the live wire of power supply of main circuit.
The utility model is owing to have the self check coil, and microcomputer can send control signal to the self check coil by certain time interval, makes the self check coil by certain time interval energising simulation leaky.If magnetic test coil can produce induced electromotive force, comparator will be exported corresponding electric leakage signal, and microcomputer is judged this signal, learns that earth leakage protective device is working properly.If magnetic test coil can not produce induced electromotive force, comparator can not be exported corresponding electric leakage signal, and microcomputer is learnt that earth leakage protective device breaks down, and sent corresponding alarm signal after judging.The utility model is compared with existing electric heater, can constantly carry out self check to earth leakage protective device, breaks down if find earth leakage protective device, can send alarm signal, has improved safety in utilization of the present utility model, the generation of the phenomenon that prevents from effectively to get an electric shock.
Below in conjunction with accompanying drawing embodiment of the present utility model is described in detail.
Fig. 1 is the circuit block diagram of control circuit of the present utility model.
Fig. 2 is the circuit diagram of control circuit of the present utility model.
Fig. 3 is the circuit diagram of main circuit of the present utility model.
Present embodiment is a kind of electric heater, and it comprises water tank and electric heating system, and electric heating system is made up of main circuit and control circuit.As depicted in figs. 1 and 2, control circuit comprises earth leakage protective device B, amplifier, comparator, microcomputer IC and executive circuit.The single-chip microcomputer 68HC705SR3CP that microcomputer IC adopts U.S. Motorola Inc. to produce.Earth leakage protective device B has live wire coil n
1, zero line coil n
2, magnetic test coil n
3With self check coil n
4, live wire coil n
1Be connected in the live wire of power supply of main circuit zero line coil n
2Be connected in the zero line of power supply of main circuit.Magnetic test coil n
3Output be connected with amplifier input terminal, the output of amplifier is connected with the input of comparator, the output of comparator is connected with the IRQ pin of microcomputer.Comparator is a voltage comparator.Self check coil n
4An end and resistance R
5An end connect resistance R
5The other end be connected with the positive pole of dc source.The other end of self check coil and triode N
2Colelctor electrode connect triode N
2Grounded emitter, base stage and resistance R
4An end connect resistance R
4The other end and the PC of microcomputer IC
5Pin connects.Executive circuit comprises triode N
1, triode P and relay K.Triode N
1Base stage and resistance R
2An end connect resistance R
2The other end and the PC of microcomputer
4Pin connects.Triode N
1Grounded emitter, colelctor electrode and resistance R
3An end connect resistance R
3The other end be connected with the base stage of triode P.The emitter stage of triode P is connected with the positive pole of dc source, and colelctor electrode is connected with an end of the coil of relay K, an end and the resistance R of the other end of the coil of relay K and thermal fuse-link S
1An end connect the other end ground connection of thermal fuse-link S.Resistance R
1The other end and the PC of microcomputer IC
3Pin and voltage-stabiliser tube Z
1An end connect voltage-stabiliser tube Z
1Other end ground connection.As shown in Figure 3, main circuit comprises electrothermal tube HL.The live wire L of alternating current 220V power supply is connected with the end of the normally opened contact K-1 of relay K, the other end of normally opened contact K-1 and live wire coil n
1A end connect live wire coil n
1B end and temperature controller T
1An end connect temperature controller T
1The other end be connected with the end of electrothermal tube HL.The other end of electrothermal tube HL and temperature controller T
2An end connect temperature controller T
2The other end and zero line coil n
2C end connect zero line coil n
2D end be connected with the end of the normally opened contact K-2 of relay K, the other end of normally opened contact K-2 is connected with the zero line of alternating current 220V power supply.
During operate as normal, the PC of microcomputer IC
4Pin output high level, triode N
1With P conducting, relay K adhesive, the normally opened contact K-1 of relay K and K-2 closure, the power supply of main circuit is switched on.If there is not leaky in the main circuit, then flow to live wire coil n
1Electric current with flow to zero line coil n
2Electric current equate.Live wire coil n
1The magnetic field and the zero line coil n that produce
2The magnetic field equal and opposite in direction, the direction that produce are opposite, and the magnetic field among the whole earth leakage protective device B is zero, magnetic test coil n
3In the electronic heat of not inducting, magnetic test coil n
3Output voltage be 0, the output voltage of amplifier is zero, the comparator output low level.If leaky is arranged in the main circuit, then flow to live wire coil n
1Electric current with flow to zero line coil n
2Electric current unequal.Produce magnetic field among the earth leakage protective device B, magnetic test coil n
3The middle induced electromotive force that produces.Magnetic test coil n
3Output voltage after amplifier amplifies, input comparator.Comparator with input voltage and a fixed voltage relatively after, to IRQ pin output high level.After microcomputer IC receives this level, learn the main circuit electric leakage, its PC
4The pin output low level, triode N
1End with P, relay K discharges, and normally opened contact K-1 and K-2 disconnect the power supply of main circuit.The PC of microcomputer IC
5Pin is every high level pulse signal of kind output in 10 fens, triode N
2Conducting, self check coil n
4In power supply be switched on self check coil n
4In earth leakage protective device B, produce magnetic field.If earth leakage protective device B is working properly, at magnetic test coil n
3In will produce induced electromotive force, comparator output high level, microcomputer IC learns that through judging earth leakage protective device is working properly.If earth leakage protective device breaks down, the PC of microcomputer IC
5Behind the pin output high level pulse signal, magnetic test coil n
3In do not produce induced electromotive force, comparator is output low level still.Microcomputer IC learns that earth leakage protective device B produces fault, by the respective pin output alarm signal through after judging.Thermal fuse-link S is placed in the inner bag of water tank, if lack of water generation dry combustion method phenomenon in the water tank, thermal fuse-link S will be fused, and relay K discharges, and normally opened contact K-1 and K-2 disconnect the power supply of main circuit, play a protective role.Resistance R
1With voltage-stabiliser tube Z
1Together to the PC of microcomputer IC
3Pin shields, when thermal fuse-link S fuses, and PC
3Be not subjected to too much influence.
Claims (4)
1, the electric heater of band earth leakage protective device comprises water tank and electric heating system, and electric heating system is made up of main circuit and control circuit, it is characterized in that, control circuit comprises earth leakage protective device, amplifier, comparator, microcomputer and executive circuit; Earth leakage protective device is connected with zero line with the live wire of main circuit; The magnetic test coil of earth leakage protective device is connected with amplifier input terminal, and the output of amplifier is connected with the input of comparator, and the output of comparator is connected with microcomputer; Earth leakage protective device also has the self check coil, and the self check coil is connected with power supply, the switching on and off of the power supply of microcomputer control self check coil; Executive circuit is connected with microcomputer, the switching on and off of the power supply of executive circuit control main circuit.
2, electric heater according to claim 1 is characterized in that, an end of self check coil and resistance (R
5) an end connect resistance (R
5) the other end be connected with positive source; The other end of self check coil and triode (N
2) colelctor electrode connect triode (N
2) grounded emitter, triode (N
2) base stage and resistance (R
4) an end connect resistance (R
4) the other end be connected with the I/O mouth of microcomputer.
3, electric heater according to claim 1 and 2 is characterized in that, executive circuit comprises triode (N
1), triode (P) and relay (K); Triode (N
1) base stage and resistance (R
2) an end connect resistance (R
2) the other end be connected triode (N with the I/O mouth of microcomputer
1) grounded emitter, colelctor electrode and resistance (R
3) an end connect; Resistance (R
3) the other end be connected with the base stage of triode (P), the emitter stage of triode (P) is connected with positive source, colelctor electrode is connected with an end of the coil of relay (K); One end of the other end of the coil of relay (K) and thermal fuse-link (S) and resistance (R
1) an end connect the other end ground connection of thermal fuse-link (S); Resistance (R
1) the other end and the I/O mouth and the voltage-stabiliser tube (Z of microcomputer
1) an end connect voltage-stabiliser tube (Z
1) other end ground connection; The normally opened contact (K-1) of relay (K) is connected in the live wire of power supply of main circuit.
4, electric heater according to claim 3 is characterized in that, the normally opened contact (K-2) of relay (K) is connected in the zero line of power supply of main circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98250102 CN2359623Y (en) | 1998-12-08 | 1998-12-08 | Electric water heater with earth leakage protective device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 98250102 CN2359623Y (en) | 1998-12-08 | 1998-12-08 | Electric water heater with earth leakage protective device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2359623Y true CN2359623Y (en) | 2000-01-19 |
Family
ID=33994671
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 98250102 Expired - Fee Related CN2359623Y (en) | 1998-12-08 | 1998-12-08 | Electric water heater with earth leakage protective device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2359623Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104142439A (en) * | 2013-05-08 | 2014-11-12 | 博西华电器（江苏）有限公司 | Household appliance |
-
1998
- 1998-12-08 CN CN 98250102 patent/CN2359623Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104142439A (en) * | 2013-05-08 | 2014-11-12 | 博西华电器（江苏）有限公司 | Household appliance |
| CN104142439B (en) * | 2013-05-08 | 2018-06-05 | 博西华电器（江苏）有限公司 | Household electrical appliance |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |