CN2566514Y - Earth leakage and short-circuit overcurrent double protector for electric water heater - Google Patents
Earth leakage and short-circuit overcurrent double protector for electric water heater Download PDFInfo
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- CN2566514Y CN2566514Y CN 02268285 CN02268285U CN2566514Y CN 2566514 Y CN2566514 Y CN 2566514Y CN 02268285 CN02268285 CN 02268285 CN 02268285 U CN02268285 U CN 02268285U CN 2566514 Y CN2566514 Y CN 2566514Y
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Abstract
The utility model relates to a double protector for leakage, short circuit, and over current of an electric water heater, which belongs to the technical field of the electric water heater. The double protector for leakage, short circuit, and over current of an electric water heater is composed of a power supply, an electric heating circuit, a leakage detecting unit, a control unit, an alarm unit, and an executing unit; a short circuit and over current detecting unit is also installed on power supply wires, and the short circuit and over current detecting unit is connected with the control unit, the power supply, and the electric heating circuit; the short circuit and over current detecting unit is composed of a current mutual inductor, a bridge rectifier circuit, a current/voltage switching circuit, a clamping protection circuit, and a voltage comparing circuit; the current/voltage switching circuit is composed of resistors R1, R2 and a capacitor C1; the clamping protection circuit is composed of diodes D5; the voltage comparing circuit is composed of resistors R3 and R4, an integrated circuit IC1, and a resistor R5; the integrated circuit IC1 is composed of operational amplifiers. Not only the utility model is provided with leakage protection, but also the utility model is provided with short circuit and over current protection, so that the utility model has a function of double protection. With reliability and safety, the utility model can be used for the household electric water heater and various electric water heaters with the similar purpose.
Description
Technical field
The utility model belongs to the electric heater technical field, more particularly relates to the improvement of electric heater protective circuit.
Background technology
Existing electric heater has mostly been adorned earth leakage protective device.This device will be cut off the electricity supply when detecting leakage current automatically, establishes body safety with the protection people.Publication number be CN2380873's " all-weather solar-energy water-heater " disclose a kind of like this water heater that has earth leakage circuit-breaker.
But Gu name Si Yi, earth leakage protective device only just can play when electric leakage and cut off the electricity supply, guarantees safe effect.For the overcurrent that factors such as the short circuit that causes such as factors such as insulation damages or aging circuits, overload or overvoltage cause, existing electric heater there is no more reliable, safer protective device except being provided with fuse.
The purpose of this utility model; just be to overcome above-mentioned shortcoming and defect; provide a kind of and not only be provided with earth leakage protective, and be provided with short circuit, overcurrent protection, have more reliable, the safer electric heater electric leakage of double protection functions and short circuit, overcurrent double protecting device.
Summary of the invention
In order to achieve the above object, the utility model by the power supply and the electric heating circuit of electric heater, be installed in detection of electrical leakage unit on the power line of power supply and electric heating circuit, the control unit that is connected with power supply and electric heating circuit with the detection of electrical leakage unit, the alarm unit that is connected with power supply and electric heating circuit with control unit and constituted with the performance element that power supply and electric heating circuit are connected with control unit.Short circuit, over-current detection unit also are installed on the power line of power supply and electric heating circuit, and short circuit, over-current detection unit also link to each other with power supply and electric heating circuit with control unit.
Short circuit, over-current detection unit are made up of the current transformer on the power line that is installed in power supply and electric heating circuit, the bridge rectifier that is connected with current transformer, the current/voltage-converted circuit that is connected with bridge rectifier, the clamping protective circuit that is connected with the current/voltage-converted circuit and the voltage comparator circuit that is connected with clamping protective circuit.Voltage comparator circuit also is connected with control unit.
The current/voltage-converted circuit is made up of resistance R 1, R2 and capacitor C 1.The negative pole of diode D2 and D4 is connected its other end ground connection in one end of resistance R 1 and an end of resistance R 2 and the bridge rectifier.In the other end of resistance R 2 and the clamping protective circuit in the positive pole of diode D5 and the voltage comparator circuit inverting input 2 of integrated circuit (IC) 1 be connected, and through capacitor C 1 ground connection.
Clamping protective circuit is made up of diode D5.The inverting input 2 of IC1 is connected in the other end of the positive pole of D5 and resistance R 2 and the voltage comparator circuit, and its negative pole is connected with power Vcc.
Voltage comparator circuit is made up of resistance R 3 and R4, integrated circuit (IC) 1, resistance R 5, one end of resistance R 3 is connected with power Vcc, its other end is connected with the normal phase input end 3 of IC1 and through R4 ground connection, the output 1 of IC1 is connected with the input/output terminal I/O of control unit through resistance R 5.
Integrated circuit (IC) 1 is made up of operational amplifier.Can adopt models such as LM358, HA-5144, EL2444C.
Current transformer of the present utility model is used for big electric current is converted to little electric current in proportion for detecting.It is direct current that bridge rectifier is used for the electric main rectification.The current/voltage-converted circuit is used for that direct current is converted to voltage signal voltage supplied comparison circuit to be compared and compares.Clamping protective circuit is used to limit the maximum of voltage signal to be compared, in order to avoid damage voltage comparator circuit.Voltage comparator circuit is used to provide reference voltage, and voltage signal to be compared is compared with it, sends comparative result to control unit.Control unit sends instruction reports to the police alarm unit, makes performance element cut off the electricity supply, finish the protection task simultaneously.
One phase of single phase alternating current power supply (L or N) is passed the coil of current transformer TA2.The current transformer induction detects load current, and through rectification, current/voltage-converted, delivers to voltage comparator circuit and reference voltage (set point) and compare.When load current during greater than set point, comparator output high level OVER-C is to the corresponding I/O port one of control unit.Control unit output control signal, performance element is cut off the electricity supply.For the input of the integrated circuit (IC) 1 that prevents voltage comparator circuit is subjected to high-tension impact failure, be provided with clamping protective circuit.When the voltage signal to be compared that converts to when load current was higher than the control power source voltage Vcc, diode D5 conducting clamped down on the current potential of the inverting input 2 of integrated circuit (IC) 1 in the control power source voltage Vcc, thereby had played the purpose of protection integrated circuit (IC) 1.
Task of the present utility model comes to this and finishes.
The utility model not only is provided with earth leakage protective, and is provided with short circuit, overcurrent protection, has double protection functions, thereby more reliable, safer.And can further protect other indoor household electrical appliance to exempt from damage.Its line construction is simple, and production cost is low, and it is reliable to be active in one's movements.It can be widely used in the various electric heaters of family expenses and similar applications.
Description of drawings
Fig. 1 is a circuit block diagram of the present utility model.
Fig. 2 is circuit theory diagrams of the present utility model.
Shown in Figure 1, circuit of the present utility model is made of power supply and electric heating circuit 1, detection of electrical leakage unit 2, control unit 3, alarm unit 4 and performance element 5.Short circuit, over-current detection unit 7 also are installed on the power line 6.The AC power incoming line one mutually by electromagnetic induction, with the induction by current that wherein flows through coil, send into short circuit, over-current detection unit 7 compares with reference voltage to current transformer TA2.When the AC load circuit opens circuit or during over current fault, the electric current in the coil of current transformer TA2 increases.If this electric current is greater than set point (good reference voltage in advance promptly converts), then short circuit, over-current detection unit 7 output high level are to control unit 3 corresponding I/O mouths, and control unit 3 is by performance element 5 output control signals, with dump.
Shown in Figure 2, short circuit of the present utility model, over-current detection unit 7 are made up of the current transformer TA2 on the power line 6 that is installed in power supply and electric heating circuit 1, bridge rectifier, current/voltage-converted circuit, clamping protective circuit and voltage comparator circuit.Voltage comparator circuit also is connected with control unit 3.The current/voltage-converted circuit is made up of resistance R 1, R2 and capacitor C 1.Clamping protective circuit is made up of diode D5.Voltage comparator circuit is made up of resistance R 3 and R4, integrated circuit (IC) 1, resistance R 5.Integrated circuit (IC) 1 is made up of operational amplifier.The annexation of each components and parts as shown.
Embodiment
Embodiment of the present utility model 1 is as follows: a kind of electric heater electric leakage and short circuit, overcurrent double protecting device.It is made of power supply and electric heating circuit, detection of electrical leakage unit, control unit, alarm unit and performance element.Short circuit, over-current detection unit also are installed on the power line, and it also links to each other with power supply and electric heating circuit with control unit.Short circuit, over-current detection unit are made up of current transformer, bridge rectifier, current/voltage-converted circuit, clamping protective circuit and voltage comparator circuit.The current/voltage-converted circuit is made up of resistance R 1, R2 and capacitor C 1.Clamping protective circuit is made up of diode D5.Voltage comparator circuit is made up of resistance R 3 and R4, integrated circuit (IC) 1, resistance R 5.Integrated circuit (IC) 1 is made up of operational amplifier.
Claims (9)
1. an electric heater leaks electricity and short circuit; the overcurrent double protecting device; it is by the power supply and the electric heating circuit of electric heater; be installed in the detection of electrical leakage unit on the power line of power supply and electric heating circuit; the control unit that is connected with power supply and electric heating circuit with the detection of electrical leakage unit; the alarm unit that is connected with power supply and electric heating circuit with control unit and constitute with the performance element that power supply and electric heating circuit are connected with control unit; it is characterized in that on the power line of said power supply and electric heating circuit short circuit being installed also; over-current detection unit, short circuit; over-current detection unit also links to each other with power supply and electric heating circuit with control unit.
2. according to the described electric heater electric leakage of claim 1 and short circuit, overcurrent double protecting device; it is characterized in that said short circuit, over-current detection unit are made up of the current transformer on the power line that is installed in power supply and electric heating circuit, the bridge rectifier that is connected with current transformer, the current/voltage-converted circuit that is connected with bridge rectifier, the clamping protective circuit that is connected with the current/voltage-converted circuit and the voltage comparator circuit that is connected with clamping protective circuit, voltage comparator circuit also is connected with control unit.
3. according to the described electric heater electric leakage of claim 2 and short circuit, overcurrent double protecting device; it is characterized in that said current/voltage-converted circuit is made up of resistance R 1, R2 and capacitor C 1; the negative pole of diode D2 and D4 is connected in one end of resistance R 1 and an end of resistance R 2 and the bridge rectifier; in its other end ground connection, the other end of resistance R 2 and clamping protective circuit in the positive pole of diode D5 and the voltage comparator circuit inverting input 2 of integrated circuit (IC) 1 be connected and through capacitor C 1 ground connection.
4. according to claim 2 or 3 described electric heater electric leakages and short circuit, overcurrent double protecting device; it is characterized in that said clamping protective circuit is made up of diode D5; the inverting input 2 of IC1 is connected in the other end of the positive pole of D5 and resistance R 2 and the voltage comparator circuit, and its negative pole is connected with power Vcc.
5. according to claim 2 or 3 described electric heater electric leakages and short circuit, overcurrent double protecting device; it is characterized in that said voltage comparator circuit is made up of resistance R 3 and R4, integrated circuit (IC) 1, resistance R 5; one end of resistance R 3 is connected with power Vcc; its other end is connected with the normal phase input end 3 of IC1 and through R4 ground connection, the output 1 of IC1 is connected with the input/output terminal I/O of control unit through resistance R 5.
6. according to the described electric heater electric leakage of claim 4 and short circuit, overcurrent double protecting device; it is characterized in that said voltage comparator circuit is made up of resistance R 3 and R4, integrated circuit (IC) 1, resistance R 5; one end of resistance R 3 is connected with power Vcc; its other end is connected with the normal phase input end 3 of IC1 and through R4 ground connection, the output 1 of IC1 is connected with the input/output terminal I/O of control unit through resistance R 5.
7. according to claim 3 or 6 described electric heater electric leakages and short circuit, overcurrent double protecting device, it is characterized in that said integrated circuit (IC) 1 is made up of operational amplifier.
8. according to the described electric heater electric leakage of claim 4 and short circuit, overcurrent double protecting device, it is characterized in that said integrated circuit (IC) 1 is made up of operational amplifier.
9. according to the described electric heater electric leakage of claim 5 and short circuit, overcurrent double protecting device, it is characterized in that said integrated circuit (IC) 1 is made up of operational amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02268285 CN2566514Y (en) | 2002-07-10 | 2002-07-10 | Earth leakage and short-circuit overcurrent double protector for electric water heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02268285 CN2566514Y (en) | 2002-07-10 | 2002-07-10 | Earth leakage and short-circuit overcurrent double protector for electric water heater |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2566514Y true CN2566514Y (en) | 2003-08-13 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02268285 Expired - Fee Related CN2566514Y (en) | 2002-07-10 | 2002-07-10 | Earth leakage and short-circuit overcurrent double protector for electric water heater |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2566514Y (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100445645C (en) * | 2005-09-12 | 2008-12-24 | 陈伟明 | Automatic gas safety protecting method |
| CN102904210A (en) * | 2012-10-08 | 2013-01-30 | 广东美的电器股份有限公司 | Leakage protection method, leakage protection device and water heater |
| CN104546354A (en) * | 2013-10-14 | 2015-04-29 | 深圳市科曼医疗设备有限公司 | Infant incubator and power equipment working state detecting method thereof |
| CN104739239A (en) * | 2015-03-25 | 2015-07-01 | 张新建 | Water dispenser with power outage tripping protection function |
| CN104833098A (en) * | 2015-05-14 | 2015-08-12 | 芜湖美的厨卫电器制造有限公司 | Heating control method and heating control system of electric water heater and electric water heater |
| CN109254223A (en) * | 2018-11-07 | 2019-01-22 | 深圳市众祥安全科技有限公司 | Leak electricity short-circuit detection method, open circuit protection equipment, monitoring center, system |
| CN118100097A (en) * | 2024-04-19 | 2024-05-28 | 深圳市嘉力电气技术有限公司 | Intelligent UV power output ground short-circuit protection circuit |
-
2002
- 2002-07-10 CN CN 02268285 patent/CN2566514Y/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100445645C (en) * | 2005-09-12 | 2008-12-24 | 陈伟明 | Automatic gas safety protecting method |
| CN102904210A (en) * | 2012-10-08 | 2013-01-30 | 广东美的电器股份有限公司 | Leakage protection method, leakage protection device and water heater |
| CN104546354A (en) * | 2013-10-14 | 2015-04-29 | 深圳市科曼医疗设备有限公司 | Infant incubator and power equipment working state detecting method thereof |
| CN104546354B (en) * | 2013-10-14 | 2017-05-17 | 深圳市科曼医疗设备有限公司 | Infant incubator and power equipment working state detecting method thereof |
| CN104739239A (en) * | 2015-03-25 | 2015-07-01 | 张新建 | Water dispenser with power outage tripping protection function |
| CN104833098A (en) * | 2015-05-14 | 2015-08-12 | 芜湖美的厨卫电器制造有限公司 | Heating control method and heating control system of electric water heater and electric water heater |
| CN109254223A (en) * | 2018-11-07 | 2019-01-22 | 深圳市众祥安全科技有限公司 | Leak electricity short-circuit detection method, open circuit protection equipment, monitoring center, system |
| CN118100097A (en) * | 2024-04-19 | 2024-05-28 | 深圳市嘉力电气技术有限公司 | Intelligent UV power output ground short-circuit protection circuit |
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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 |