CN104142024B - A kind of water heater - Google Patents
A kind of water heater Download PDFInfo
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- CN104142024B CN104142024B CN201310165037.5A CN201310165037A CN104142024B CN 104142024 B CN104142024 B CN 104142024B CN 201310165037 A CN201310165037 A CN 201310165037A CN 104142024 B CN104142024 B CN 104142024B
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Abstract
The present invention provides a kind of water heater, including loop current detection device, the loop current detection device includes being connect with circuit to detect the whether reversed circuit self-test unit in the circuit, so as to the problem for avoiding detection device reversed.Specifically, circuit is mainly made of first input end, the second input terminal and the sampling resistor, and the voltage stabilizing provides unit and is connected to the circuit self-test unit to provide the detection circuit whether reversed reference voltage for the circuit self-test unit.In addition, working as first input end external connection water heater housing, when the magnesium stick of the second input terminal external connection water heater, whether voltage of the circuit self-test unit by judging input can detect whether magnesium stick exhaust more than preset alarm threshold value.
Description
【Technical field】
The present invention relates to household electrical appliance, a kind of particularly water heater including loop current detection device.
【Background technology】
Scale, incrustation scale are largely attached to storage-type electric water heater to usual Domestic water storage formula electric heater water heater in order to prevent
It is general using the method for sacrificing magnesium stick in the liner of water heater, magnesium ion is discharged using magnesium stick to alleviate scale, incrustation scale to liner
Corrosion.Magnesium stick is once exhausted, if being easy for causing liner corrosion or heating tube corrosion failure without replacing in time, one
Aspect can shorten service life of a machine, on the other hand can also cause danger of hazardous electrical discharges, cause personal injury accidents.
At present using detection electric heater water heater magnesium rod consumption by the way of be mainly producer provide after-sale service, periodically
Progress magnesium stick consumption of visiting, which detects and replaces magnesium stick, also excludes hidden danger, but the use due to different user to electric heater water heater
Frequency is different, therefore magnesium stick depletion rate is also not quite similar, therefore the mode of periodic detection may not be able to detect that magnesium stick disappears
It has consumed, it is necessary to repeatedly send someone to be detected, human cost is higher.
Although there is some that can detect the device of water heater magnesium rod consumption automatically in the prior art, these devices are typically logical
The mode of measure loop electric current is crossed, two input terminals for easily causing detection device when detecting are reversed, to detect
The magnesium stick of water heater consumes.Same similar reversed situation is also possible to be happened at other kinds of detection device in water heater
On.
【Invention content】
In view of this, the present invention provides a kind of water heater, in order to the problem for avoiding detection device reversed.
Specific technical solution is as follows：
A kind of water heater, including loop current detection device, the loop current detection device include connect with circuit with
The whether reversed circuit self-test unit of measure loop.
According to a preferred embodiment of the invention, the loop current detection device further includes：Sampling resistor and voltage stabilizing carry
For unit；
Circuit is mainly made of first input end, the second input terminal and the sampling resistor, and the voltage stabilizing provides unit and connects
It is connected to the circuit self-test unit and detects the whether reversed reference voltage in the circuit to be provided for the circuit self-test unit.
According to a preferred embodiment of the invention, the loop current detection device further includes：Input signal control unit,
Signal amplification unit and alarm unit；
The input signal control unit controls the break-make in the circuit；
When the circuit communication, the electric current in circuit forms voltage signal by the sampling resistor, inputs the circuit
Voltage input signal and the reference voltage signal inputted after the amplification of the signal amplification unit circuit from
Unit is examined, the circuit self-test unit drives the alarm unit alarm according to testing result.
According to a preferred embodiment of the invention, it includes the first bleeder circuit and voltage follow that the voltage stabilizing, which provides unit,
Device, the reference voltage are that the voltage division signal exported by first bleeder circuit is generated by the voltage follower.
According to a preferred embodiment of the invention, it further includes filter capacitor that the voltage stabilizing, which provides unit, the filter capacitor
One end be connected to the common node of the output end of first bleeder circuit and the input terminal of the voltage follower, the other end
Ground connection.
According to a preferred embodiment of the invention, the input signal control unit includes：It is in parallel with the sampling resistor
Switch or relay.
According to a preferred embodiment of the invention, second input terminal is internally connected to the voltage stabilizing and provides the defeated of unit
For outlet in the common node of the positive input of the signal amplification unit, the first input end is internally connected to the letter
The both ends of the reverse input end of number amplifying unit, the sampling resistor are separately connected the first input end and second input
End.
According to a preferred embodiment of the invention, if being returned during the test by signal amplification unit input is described
The voltage of road self-test unit is more than the reference voltage, then the circuit self-test unit detects the first input end and second
Input terminal is reversed.
According to a preferred embodiment of the invention, the first input end external connection water heater housing, described second is defeated
Enter to hold the magnesium stick of external connection water heater；
If the voltage for inputting the circuit self-test unit is more than preset alarm threshold value, the circuit self-test unit detection
Go out magnesium stick to exhaust.
According to a preferred embodiment of the invention, the water heater housing is the water heater liner.
According to a preferred embodiment of the invention, the circuit self-test unit includes MCU.
According to a preferred embodiment of the invention, the alarm unit includes display screen and/or the buzzing of the MCU connections
Device.
According to a preferred embodiment of the invention, the circuit self-test unit includes：Second bleeder circuit, first are compared
Device, the second comparator, PNP triode, NPN triode（65）, the tenth resistance（68）, eleventh resistor（69）, twelfth resistor
（70）, thirteenth resistor（71）With the 18th resistance（74）；
The output end of the signal amplification unit is connected to the reverse input end and the second comparator of the first comparator
Positive input common node, the output end of second bleeder circuit is connected to the positive input of the first comparator
End, the reverse input end of second comparator are connected to the voltage stabilizing and provide the output end of unit and the signal amplification unit
Positive input common node；
The output end of the first comparator is connected to institute by the 18th resistance eutral grounding, one end of the thirteenth resistor
The base stage of PNP triode is stated, the other end is connected to the common section of the output end and the 18th resistance of the first comparator
The collector of point, the PNP triode is connected to supply voltage by twelfth resistor；
The output end of second comparator is connected to the base stage of the NPN triode by eleventh resistor, and described
The common node of the output end of two comparators and the eleventh resistor is connected to the collector of the PNP triode and described the
The common node of 12 resistance, the emitter ground connection of the NPN triode；One end of tenth resistance is connected to the described tenth
The common node of one resistance and the base stage of the NPN triode, other end ground connection.
According to a preferred embodiment of the invention, the alarm unit includes：First light emitting diode, the second light-emitting diodes
Pipe, the 14th resistance and the 15th resistance；
One end of second light emitting diode is connected to the emitter of PNP triode, second hair by the 14th resistance
The other end of optical diode connects supply voltage；
One end of first light emitting diode by being connected to the collector of the NPN triode to the 15th resistance,
The other end of first light emitting diode connects supply voltage.
As can be seen from the above technical solutions, it is contained in the current sensing means included by water heater provided by the invention
The whether reversed circuit self-test unit of measure loop, so as to the problem for avoiding detection device reversed.
【Description of the drawings】
Fig. 1 is a kind of schematic diagram of loop current detection device provided in an embodiment of the present invention；
Fig. 2 is another schematic diagram of loop current detection device provided in an embodiment of the present invention；
Fig. 3 is the structure chart for the loop current detection device that the embodiment of the present invention one provides；
Fig. 4 is the structure chart of loop current detection device provided by Embodiment 2 of the present invention.
【Specific implementation mode】
To make the objectives, technical solutions, and advantages of the present invention clearer, right in the following with reference to the drawings and specific embodiments
The present invention is described in detail.
Water heater provided by the present invention includes loop current detection device, can be used in being made whether to connect to loop current
Reverse-examination is surveyed, and the function in loop current detection device with loop-coupled circuit self-test unit by completing, in addition to this, this time
Road self-test unit can also be used to be detected to whether magnesium stick in water heater exhausts, and will in detail be retouched in subsequent embodiment
It states.
Fig. 1 is a kind of schematic diagram of loop current detection device provided in an embodiment of the present invention, as shown in Figure 1,
The loop detector includes：Circuit self-test unit 0, sampling resistor 2 and voltage stabilizing provide unit 3.
Wherein, circuit is mainly made of first input end 01, the second input terminal 02 and sampling resistor 2, and voltage stabilizing provides unit 3
Circuit self-test unit 0 is connected to provide measure loop whether reversed reference voltage for circuit self-test unit 0.
In order to facilitate circuit self-test unit 0 for the whether reversed detection in circuit, can be amplified first by a signal
Device is first amplified signal, judges whether circuit connects by the way that the output of signal amplifier to be compared to reference voltage
Instead.The structure chart of such case can be with as shown in Fig. 2, loop current detection device includes circuit self-test unit 0 at this time, input be believed
Number control unit 1, sampling resistor 2, voltage stabilizing provide unit 3, signal amplification unit 4 and alarm unit 5.
The wherein control of input signal control unit 1 is made of first input end 01, the second input terminal 02 and sampling resistor 2
The break-make in circuit, when first input end 01 and the second input terminal 02 access water heater, first input end 01,02 and of the second input terminal
The electric current of the circuit communication that sampling resistor 2 forms, circuit forms voltage signal by sampling resistor 2.
The voltage input signal of input circuit（That is the voltage signal of first input end 01）Pass through with the signal of reference voltage
After the amplification of signal amplification unit 4（That is output voltage Vout）Input circuit self-test unit 0, alarm unit 5 is according to circuit self-test
The testing result of unit 0 is alarmed.
It is that circuit self-test unit 0 provides measure loop whether reversed reference voltage that voltage stabilizing, which provides unit 3, in no voltage
When input signal, output voltage Vout can also be fixed on certain voltage.
Whether self-test unit 0 one side in circuit is reversed for measure loop, such as when circuit self-test unit 0 judges that Vout is big
In reference voltage, then judge that first input end 01 and the second input terminal 02 are reversed.In addition to this, if the circuit self-test unit
The 0 magnesium stick consumption detection for carrying out water heater, then by 01 external connection water heater housing of first input end, in such as water heater
Courage, the magnesium stick of 02 external connection water heater of the second input terminal, in this way via the control of input signal control unit 1, in water heater
Courage, the magnesium stick of water heater and sampling resistor 2 are formed circuit, and electric current forms voltage signal by sampling resistor 2.Voltage stabilizing carries
For unit 3 be circuit self-test unit 0 provide measure loop whether reversed reference voltage, the voltage input signal of input circuit and
The signal of reference voltage is amplified to form Vout input circuits self-test unit 0 via signal amplifier 4.It is preset when Vout is more than
Alarm threshold value when, circuit self-test unit 0 detects that magnesium stick exhausts, alarm unit 5 carry out police instruction water heater magnesium stick consumption
To the greatest extent.The above-mentioned possible structure of loop current detection device is described in detail with reference to following two embodiments.
Embodiment one,
Fig. 3 is the structure chart for the loop current detection device that the embodiment of the present invention one provides, and is returned shown in the embodiment
In the current sensing means of road, terminal XS1 is externally correctly connected as：I feet are first input end 01, in external connection water heater
The II feet of courage, terminal XS1 are the second input terminal 02, the magnesium stick of external connection water heater.
Reverse input end of the first input end 01 to interior connection signal amplifying unit 4（It is connected by the 5th resistance 41 in Fig. 3
To the inverting input of operational amplifier 44）, internally it is connected to output end and signal amplification unit 4 that voltage stabilizing provides unit 3
In the common node of positive input.That is the magnesium stick of water heater liner and water heater accesses circuit by terminal XS1.This
Input signal control unit 1 in embodiment is the normally closed switch in parallel with sampling resistor 2, and when in detecting state, this is often
Make and break closes 1 and is pressed, and water heater liner, magnesium stick and sampling resistor 2 just constitute a circuit, and the electric current in circuit passes through sampling resistor
With regard to forming voltage signal.The both ends of wherein sampling resistor 2 are separately connected first input end 01 and the second input terminal 02, and value can be with
For the Ω of 40 Ω~65, preferably 56 Ω in embodiments of the present invention.
As shown in Figure 3, the first bleeder circuit 31 and voltage follower 32 constitute voltage stabilizing shown in Fig. 1 and provide unit 3,
The voltage division signal of wherein the first bleeder circuit 31 output generates reference voltage by voltage follower 32.Voltage follower mainly rises
Buffer action prevents loop current from pouring in down a chimney to the first bleeder circuit 31, stable reference voltage.
Wherein the first bleeder circuit 31 includes first resistor 34 and second resistance 35, and a termination of wherein first resistor 34 supplies
Piezoelectric voltage Vcc, another termination second resistance 35, second resistance 35 1 terminate first resistor 34, other end ground connection.First resistor 34
Voltage division signal is exported to voltage follower 32 with the common node of second resistance 35.First resistor 34 and second can be usually set
Resistance 35 is so that the reference voltage generated is in Vcc/2 or so, and preferably first resistor 34 is 47K Ω, and second resistance 35 is 22K Ω.
As shown in figure 3, voltage follower 32 is made of 3rd resistor 36, the 4th resistance 37 and operational amplifier 38, wherein
The value of 3rd resistor 36 is equal with the 4th resistance 37, preferably 10K Ω.Additionally preferably, there is also a filter capacitor 33,
One end is connected to the common node of the output end of the first bleeder circuit 31 and the input terminal of voltage follower 32, other end ground connection.
The value of the filter capacitor 33 is less than or equal to 10uF and is more than 1uF, in embodiments of the present invention preferred 10uF.
Signal amplification unit 4 is by the 5th resistance 41, the 6th resistance 42, the 7th resistance 43 and operation amplifier in the present embodiment
Device 44 forms, wherein 41 one end of the 5th resistance connects first input end 01, the other end connects the negative sense input of operational amplifier 44
End, 42 one end of the 6th resistance connect the common node of the output end and the second input terminal 02 of voltage follower 32, other end connection
The positive input of operational amplifier 44.The ratio for usually choosing the 7th resistance 43 and sampling resistor 2 is less than 30, the 6th resistance 42
Value be approximately equal to the value of the 5th resistance 41 in parallel of the 7th resistance 43, the preferably value of the 7th resistance 43 is 200K Ω, the 5th electricity
The value of the value 10K Ω of resistance 41, the 6th resistance 42 are 10K Ω.
The output voltage Vout of signal amplification unit 4 is：Voltage on the basis of wherein Vref,R1 is the value of first resistor 34, and R2 is the value of second resistance 35, and I is taking for loop current
Value, R8 are the value of sampling resistor 2, and R7 is the value of the 7th resistance 43, and R5 is the value of the 5th resistance 41.It can be seen that：
1）When usually 1 control loop of input signal control unit disconnects, voltage on the basis of I 0, Vout.
2）If signal accesses mistake, i.e. first input end 01 and the second input terminal 02 is reversed, and first input end 01 is right
It is outer connection water heater magnesium stick, 02 external connection water heater liner of the second input terminal, then I be less than zero, Vout be more than reference voltage.
Using this feature, connecting the circuit self-test unit 0 of the signal amplification unit 4, can to detect first input end 01 and second defeated
Whether reversed enter end 02, if Vout is more than reference voltage, illustrates reversed.
3）If signal access is correct, i.e. 01 external connection water heater liner of first input end, the second input terminal 02 is externally
The magnesium stick of water heater is connected, then Vout is less than reference voltage.With the consumption of magnesium stick, I is gradually reduced, and Vout gradually increases, when
When magnesium stick exhausts, Vout increases to preset alarm threshold value.The circuit self-test unit 0 for connecting the signal amplification unit 4 exists
When judging that Vout is more than preset alarm threshold value, detect that the magnesium stick of water heater exhausts.
In the present embodiment one, circuit self-test unit 0 is specifically used with lower structure：Second bleeder circuit 61, first are compared
Device 62, the second comparator 63, PNP triode 64, NPN triode 65, the tenth resistance 68, eleventh resistor 69, twelfth resistor
70, thirteenth resistor 71 and the 18th resistance 74.As shown in Figure 3, specific connection relation is as follows：
The output end of signal amplification unit 4 be connected to first comparator 62 reverse input end and the second comparator 63 just
To the common node of input terminal, the output end of the second bleeder circuit 61 is connected to the positive input of first comparator 62, and second
The reverse input end of comparator 63 is connected to the output end of voltage follower 32 and being total to for the positive input of signal amplification unit 4
Same node.
The output end of first comparator 62 is grounded by the 18th resistance 74, and one end of thirteenth resistor 71 is connected to PNP
The base stage of triode 64, the other end are connected to the common node of the output end and the 18th resistance 74 of first comparator 62, PNP tri-
The collector of pole pipe 64 is connected to supply voltage by twelfth resistor 70.
The output end of second comparator 63 is connected to the base stage of NPN triode 65 by eleventh resistor 69, and second compares
The output end of device 63 is connected to the collector and twelfth resistor 70 of PNP triode 64 with the common node of eleventh resistor 69
Common node, the emitter ground connection of NPN triode 65；One end of tenth resistance 68 is connected to eleventh resistor 69 and tri- poles NPN
The common node of the base stage of pipe 65, other end ground connection.
Above-mentioned the second bleeder circuit 61 passes through tune as shown in figure 3, be made of the 16th resistance 75 and the 17th resistance 76
Save 16 resistance 75 and the 17th resistance 76 value can be arranged first comparator 62 positive input input voltage, from
And realize the adjusting of preset alarm threshold value.
Alarm unit 5 includes：First light emitting diode 66, the second light emitting diode 67, the 14th resistance 72 and the 15th
Resistance 73.Wherein one end of the second light emitting diode 67 by the 14th resistance 72 connect PNP triode 64 emitter, second
The other end of light emitting diode 67 connects supply voltage.One end of first light emitting diode 66 is by connecting the 15th resistance 73
To the collector of NPN triode 65, the other end of the first light emitting diode 66 connects supply voltage.
If the input of first input end 01 and the second input terminal 02 is correct, in detection process, it is assumed that pass through the 16th
Resistance 75 and the alarm threshold value of the 17th resistance 76 setting are Vth, the i.e. input voltage of the positive input of first comparator 62
For Vth, then the alarm procedure of alarm unit 5 is specially：With the consumption of magnesium stick, loop current I is gradually reduced, and Vout gradually increases
Greatly, when magnesium stick exhausts, Vout increases above Vth, then first comparator 62 exports low level, and the second comparator 63 exports low
Level, the conducting of PNP triode 64 at this time, the second light emitting diode 67 is bright, and NPN triode 65 is ended, the first light emitting diode 66
It goes out.
If signal accesses mistake, i.e. first input end 01 and the second input terminal 02 is reversed, and first input end 01 is external
Connect water heater magnesium stick, 02 external connection water heater liner of the second input terminal, then I be less than zero, Vout be more than reference voltage, report
Alert unit 5 accesses wrong detection process for signal：First comparator 62 exports low level, and the second comparator 63 exports height
Level, at this time PNP triode 64 end, the second light emitting diode 67 goes out, and NPN triode 65 is connected, the first light emitting diode 66
It is bright.
In terms of value, 16 resistance 75 and 76 value of the 17th resistance are related with the setting of alarm threshold value, and preferably 16
The value of resistance 75 is 47K Ω, and the value of the 17th resistance 76 is 16K Ω.The selection of tenth resistance 68 and eleventh resistor 69
When the second comparator 63 being made to export high level, NPN triode 65 is connected.It is preferred that the tenth resistance 68 and eleventh resistor 69 take
Value is 2.2K Ω.14th resistance 72 and the 15th resistance 73 are current-limiting resistance, the 72 and the 15th electricity of preferably the 14th resistance
The value of resistance 73 is 510 Ω, and twelfth resistor 70 and the 18th resistance 74 are pull-up resistor, preferably twelfth resistor 70 and the
The value of 18 resistance 74 is 2K Ω.Thirteenth resistor 71 is base resistance, and preferably the value of thirteenth resistor 71 is 2.2K Ω.
65 preferred BC847 of NPN triode, 65 preferred BC858 of PNP triode.
Embodiment two,
Fig. 4 is the structure chart of loop current detection device provided by Embodiment 2 of the present invention, circuit shown in the present embodiment
Current sensing means is provided with embodiment one the difference is that following two points：
Input signal control unit 1 in one, the present embodiment is the relay in parallel with sampling resistor 2, such as Fig. 4 institutes
Showing, relay one terminates supply voltage Vcc2, when consuming detection without magnesium stick, contact closure；It is examined when carrying out the consumption of magnesium stick
When survey, the contact that MCU controls relay disconnects, and is constituted back to further control water heater liner, magnesium stick and sampling resistor 2
The break-make on road.Further, relay drive circuit can be connected between MCU and relay（It is not shown）.
Secondly, the circuit self-test unit 0 in the present embodiment include microcontroller 51, alarm unit 5 includes MCU51 companies
The display screen 52 and buzzer 53 connect, wherein display screen 52 and buzzer 53 can select a presence, can also exist simultaneously.It is surveying
Reference voltage, and the write-in program in MCU51 is arranged in MCU51 during trial signal accesses, if Vout is more than reference voltage,
Then MCU51 judges that first input end 01 and the second input terminal 02 are reversed, and MCU51 drives buzzer 53 to alarm, or by aobvious
Display screen 52 reminds subscriber signal to access mistake.
If first input end 01 and the second input terminal 02 access correctly, when carrying out the consumption detection of magnesium stick, pass through MCU51
Alarm threshold value, and the write-in program in MCU51 are set, and when Vout is more than alarm threshold value, MCU51 detects the magnesium stick of water heater
It exhausts, driving buzzer 53 is alarmed, or reminds user to replace magnesium stick by display screen 52.Here reality may be used in alarm threshold value
Test value or empirical value.
MCU51 can drive buzzer 53 to generate different sound when detecting that magnesium stick is exhausted with signal access mistake
It alarms, or different promptings is carried out by display screen 52 and is shown.
Other each units are identical with embodiment one, and details are not described herein.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
With within principle, any modification, equivalent substitution, improvement and etc. done should be included within the scope of protection of the invention god.
Claims (13)
1. a kind of water heater, which is characterized in that including loop current detection device, the loop current detection device includes and returns
Road is connected to detect the whether reversed circuit self-test unit (0) in the circuit,
The loop current detection device further includes：Sampling resistor (2) and voltage stabilizing provide unit (3)；
Circuit is mainly made of first input end (01), the second input terminal (02) and the sampling resistor (2), and the voltage stabilizing provides
Unit (3) is connected to the circuit self-test unit (0) and detects whether the circuit connects to be provided for the circuit self-test unit (0)
Anti- reference voltage.
2. water heater according to claim 1, which is characterized in that the loop current detection device further includes：Input letter
Number control unit (1), signal amplification unit (4) and alarm unit (5)；
The input signal control unit (1) controls the break-make in the circuit；
When the circuit communication, the electric current in circuit forms voltage signal by the sampling resistor (2), inputs the circuit
The signal of voltage input signal and the reference voltage inputs the circuit certainly after the amplification of the signal amplification unit (4)
Unit (0) is examined, the circuit self-test unit (0) drives alarm unit (5) alarm according to testing result.
3. water heater according to claim 1 or 2, which is characterized in that it includes the first partial pressure that the voltage stabilizing, which provides unit (3),
Circuit (31) and voltage follower (32), the reference voltage are the voltage division signal warps exported by first bleeder circuit (31)
Cross the voltage follower (32) generation.
4. water heater according to claim 3, which is characterized in that it further includes filter capacitor that the voltage stabilizing, which provides unit (3),
(33), one end of the filter capacitor (33) is connected to the output end of first bleeder circuit (31) and the voltage follower
(32) common node of input terminal, other end ground connection.
5. water heater according to claim 2, which is characterized in that the input signal control unit (1) includes：With it is described
The switch or relay of sampling resistor (2) parallel connection.
6. water heater according to claim 2, which is characterized in that second input terminal (02) is internally connected to described steady
Pressure is provided in the common node of the output end of unit (3) and the positive input of the signal amplification unit (4), and described first is defeated
Enter the reverse input end that end (01) is internally connected to the signal amplification unit (4), the both ends of the sampling resistor (2) connect respectively
Connect the first input end (01) and second input terminal (02).
7. water heater according to claim 6, which is characterized in that if passing through the signal amplification unit during the test
(4) voltage for inputting the circuit self-test unit (0) is more than the reference voltage, then the circuit self-test unit (0) detects
The first input end (01) and the second input terminal (02) are reversed.
8. water heater according to claim 2, which is characterized in that first input end (01) the external connection water heater shell
Body, the magnesium stick of the second input terminal (02) external connection water heater；
If the voltage for inputting the circuit self-test unit (0) is more than preset alarm threshold value, circuit self-test unit (0) inspection
Magnesium stick is measured to exhaust.
9. water heater according to claim 8, which is characterized in that the water heater housing is the water heater liner.
10. the water heater according to claim 2 or 8, which is characterized in that the circuit self-test unit (0) includes MCU
(51)。
11. water heater according to claim 10, which is characterized in that the alarm unit (5) includes that the MCU (51) connects
The display screen (52) and/or buzzer (53) connect.
12. the water heater according to claim 2 or 8, which is characterized in that the circuit self-test unit (0) includes：Second point
Volt circuit (61), first comparator (62), the second comparator (63), PNP triode (64), NPN triode (65), the tenth resistance
(68), eleventh resistor (69), twelfth resistor (70), thirteenth resistor (71) and the 18th resistance (74)；
The output end of the signal amplification unit (4) is connected to the reverse input end of the first comparator (62) and second and compares
The output end of the common node of the positive input of device (63), second bleeder circuit (61) is connected to the first comparator
(62) positive input, the reverse input end of second comparator (63) are connected to the voltage stabilizing and provide the defeated of unit (3)
The common node of outlet and the positive input of the signal amplification unit (4)；
The output end of the first comparator (62) is grounded by the 18th resistance (74), one end of the thirteenth resistor (71)
It is connected to the base stage of the PNP triode (64), the other end is connected to the output end of the first comparator (62) and described the
The collector of the common node of 18 resistance (74), the PNP triode (64) is connected to power supply by twelfth resistor (70)
Voltage；
The output end of second comparator (63) is connected to the base of the NPN triode (65) by eleventh resistor (69)
Pole, the output end of second comparator (63) are connected to tri- poles the PNP with the common node of the eleventh resistor (69)
Manage the common node of the collector and the twelfth resistor (70) of (64), the emitter ground connection of the NPN triode (65)；Institute
The one end for stating the tenth resistance (68) is connected to the common section of the eleventh resistor (69) and the base stage of the NPN triode (65)
Point, other end ground connection.
13. water heater according to claim 12, which is characterized in that the alarm unit (5) includes：First light-emitting diodes
Manage (66), the second light emitting diode (67), the 14th resistance (72) and the 15th resistance (73)；Second light emitting diode (67)
One end is connected to the emitter of PNP triode (64) by the 14th resistance (72), second light emitting diode (67) it is another
One end connects supply voltage；One end of first light emitting diode (66) is described by being connected to the 15th resistance (73)
The other end of the collector of NPN triode (65), first light emitting diode (66) connects supply voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310165037.5A CN104142024B (en) | 2013-05-07 | 2013-05-07 | A kind of water heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310165037.5A CN104142024B (en) | 2013-05-07 | 2013-05-07 | A kind of water heater |
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| Publication Number | Publication Date |
|---|---|
| CN104142024A CN104142024A (en) | 2014-11-12 |
| CN104142024B true CN104142024B (en) | 2018-08-07 |
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| CN201310165037.5A Expired - Fee Related CN104142024B (en) | 2013-05-07 | 2013-05-07 | A kind of water heater |
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| CN106092181B (en) * | 2016-06-03 | 2018-08-14 | 珠海格力电器股份有限公司 | Water heater and detection device and method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6646237B2 (en) * | 2002-03-05 | 2003-11-11 | Daniel Liu | Safety control circuit for electric water heater |
| CN101638787A (en) * | 2008-07-29 | 2010-02-03 | 维恩克（鹤壁）镁基材料有限公司 | Sacrificial magnesium alloy anode with external resistor |
| CN101907672A (en) * | 2010-06-30 | 2010-12-08 | 常熟市立得电器有限公司 | Earth wire electrification detection device for earth leakage protective device of electric water heater |
| CN202303957U (en) * | 2011-10-31 | 2012-07-04 | 本科电器有限公司 | Electric water heater with anode stub use-up alarm indication function |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| KR101526189B1 (en) * | 2013-12-30 | 2015-06-05 | 롯데알미늄 주식회사 | Fire detection apparatus in a boiler and voltage controll method thereof |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6646237B2 (en) * | 2002-03-05 | 2003-11-11 | Daniel Liu | Safety control circuit for electric water heater |
| CN101638787A (en) * | 2008-07-29 | 2010-02-03 | 维恩克（鹤壁）镁基材料有限公司 | Sacrificial magnesium alloy anode with external resistor |
| CN101907672A (en) * | 2010-06-30 | 2010-12-08 | 常熟市立得电器有限公司 | Earth wire electrification detection device for earth leakage protective device of electric water heater |
| CN202303957U (en) * | 2011-10-31 | 2012-07-04 | 本科电器有限公司 | Electric water heater with anode stub use-up alarm indication function |
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| CN104142024A (en) | 2014-11-12 |
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