CN104142024A - Water heater - Google Patents
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- CN104142024A CN104142024A CN201310165037.5A CN201310165037A CN104142024A CN 104142024 A CN104142024 A CN 104142024A CN 201310165037 A CN201310165037 A CN 201310165037A CN 104142024 A CN104142024 A CN 104142024A
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Abstract
The invention provides a water heater. The water heater comprises a loop current detection device. The loop current detection device comprises a loop self-detection unit which is connected with the loop so as to detect whether the loop is connected reversely or not, and therefore the problem that the detection device is connected reversely can be solved. Particularly, the loop is mainly composed of a first input end, a second input end and a sampling resistor, and a voltage stabilization providing unit is connected to the loop self-detection unit so as to provide a reference voltage, used for detecting whether the loop is connected reversely or not, for the loop self-detection unit. In addition, when the first input end is externally connected with a water heater shell, and the second input end is externally connected with a magnesium rod of the water heater, the loop self-detection unit can detect whether the magnesium rod is used up or not by judging whether the input voltage is larger than a preset alarm threshold value or not.
Description
[technical field]
The present invention relates to household electrical appliance, relate to especially a kind of water heater that comprises loop current checkout gear.
[background technology]
Conventionally Domestic water storage formula electric heater water heater is attached in the inner bag of storage-type electric water heater water heater in a large number in order to prevent scale, incrustation scale, and the general way of sacrificing magnesium rod that adopts is utilized magnesium rod to discharge magnesium ion and alleviated scale, the corrosion of incrustation scale to inner bag.Once magnesium rod is exhausted, if do not change in time and just easily cause inner bag corrosion or heating tube corrosion failure, can shorten service life of a machine on the one hand, also can cause on the other hand electric leakage dangerous, cause personal injury accidents.
The mode of the detection electric heater water heater magnesium rod consumption adopting is at present mainly that producer provides after-sale service, regularly visit and carry out the consumption of magnesium rod and detect and change magnesium rod and also get rid of hidden danger, but because different user is different to the frequency of utilization of electric heater water heater, therefore magnesium rod depletion rate is also not quite similar, therefore the mode regularly detecting might not detect magnesium rod and run out of, just need to repeatedly send someone to detect, human cost be higher.
Although there are some can automatically detect the device that water heater magnesium rod consumes in prior art, these devices are normally by detecting the mode of loop current, when detecting, be easy to cause two input terminations of checkout gear anti-, thereby cannot detect the magnesium rod consumption of water heater.Same similarly connect anti-situation and also may occur on the checkout gear of other types in water heater.
[summary of the invention]
In view of this, the invention provides a kind of water heater, so that avoid checkout gear to connect anti-problem.
Concrete technical scheme is as follows:
A water heater, comprises loop current checkout gear, and described loop current checkout gear comprises whether be connected to detect loop with loop connect anti-loop self-test unit.
One preferred embodiment according to the present invention, described loop current checkout gear also comprises: sampling resistor and voltage stabilizing provide unit;
Loop mainly consists of first input end, the second input and described sampling resistor, and described voltage stabilizing provides unit to be connected to described loop self-test unit to think that described loop self-test unit provides and detect described loop and whether connect anti-reference voltage.
One preferred embodiment according to the present invention, described loop current checkout gear also comprises: input signal control module, signal amplification unit and alarm unit;
Described input signal control module is controlled the break-make in described loop;
When described circuit communication, the electric current in loop forms voltage signal through described sampling resistor, input the voltage input signal in described loop and the signal of described reference voltage and after the amplification of described signal amplification unit, input described loop self-test unit, described loop self-test unit drives described alarm unit to report to the police according to testing result.
One preferred embodiment according to the present invention, described voltage stabilizing provides unit to comprise the first bleeder circuit and voltage follower, and described reference voltage is that the voltage division signal of being exported by described the first bleeder circuit produces through described voltage follower.
One preferred embodiment according to the present invention, described voltage stabilizing provides unit also to comprise filter capacitor, and one end of described filter capacitor is connected to the common node of the output of described the first bleeder circuit and the input of described voltage follower, other end ground connection.
One preferred embodiment according to the present invention, described input signal control module comprises: the switch in parallel with described sampling resistor or relay.
One preferred embodiment according to the present invention, described the second input is internally connected to described voltage stabilizing to be provided in the common node of the output of unit and the positive input of described signal amplification unit, described first input end is internally connected to the reverse input end of described signal amplification unit, and the two ends of described sampling resistor connect respectively described first input end and described the second input.
One preferred embodiment according to the present invention, if the voltage of inputting described loop self-test unit through described signal amplification unit in test process is greater than described reference voltage, described loop self-test unit detects described first input end and the second input termination is anti-.
One preferred embodiment according to the present invention, described first input end externally connects water heater housing, and described the second input externally connects the magnesium rod of water heater;
If input the voltage of described loop self-test unit, be greater than default alarm threshold value, described loop self-test unit detects magnesium rod and exhausts.
One preferred embodiment according to the present invention, described water heater housing is described water heater liner.
One preferred embodiment according to the present invention, described loop self-test unit comprises MCU.
One preferred embodiment according to the present invention, described alarm unit comprises display screen and/or the buzzer that described MCU connects.
One preferred embodiment according to the present invention, described loop self-test unit comprises: the second bleeder circuit, the first comparator, the second comparator, PNP triode, NPN triode (65), the tenth resistance (68), the 11 resistance (69), the 12 resistance (70), the 13 resistance (71) and the 18 resistance (74);
The output of described signal amplification unit is connected to the common node of the reverse input end of described the first comparator and the positive input of the second comparator, the output of described the second bleeder circuit is connected to the positive input of described the first comparator, and the reverse input end of described the second comparator is connected to the common node that described voltage stabilizing provides the output of unit and the positive input of described signal amplification unit;
The output of described the first comparator is by the 18 resistance eutral grounding, one end of described the 13 resistance is connected to the base stage of described PNP triode, the other end is connected to the common node of output and described the 18 resistance of described the first comparator, and the colelctor electrode of described PNP triode is connected to supply voltage by the 12 resistance;
The output of described the second comparator is connected to the base stage of described NPN triode by the 11 resistance, the output of described the second comparator and the common node of described the 11 resistance are connected to the common node of colelctor electrode and described the 12 resistance of described PNP triode, the grounded emitter of described NPN triode; One end of described the tenth resistance is connected to the common node of the base stage of described the 11 resistance and described NPN triode, other end ground connection.
One preferred embodiment according to the present invention, described alarm unit comprises: the first light emitting diode, the second light emitting diode, the 14 resistance and the 15 resistance;
One end of the second light emitting diode is connected to the emitter stage of PNP triode by the 14 resistance, the other end of described the second light emitting diode connects supply voltage;
One end of described the first light emitting diode is by the 15 resistance being connected to the colelctor electrode of described NPN triode, and the other end of described the first light emitting diode connects supply voltage.
As can be seen from the above technical solutions, in the included current sensing means of water heater provided by the invention, comprised and detected loop and whether connect anti-loop self-test unit, thereby can avoid checkout gear to connect anti-problem.
[accompanying drawing explanation]
A kind of schematic diagram of the loop current checkout gear that Fig. 1 provides for the embodiment of the present invention;
The another kind of schematic diagram of the loop current checkout gear that Fig. 2 provides for the embodiment of the present invention;
The structure chart of the loop current checkout gear that Fig. 3 provides for the embodiment of the present invention one;
The structure chart of the loop current checkout gear that Fig. 4 provides for the embodiment of the present invention two.
[specific embodiment]
In order to make the object, technical solutions and advantages of the present invention clearer, below in conjunction with the drawings and specific embodiments, describe the present invention.
Water heater provided by the present invention comprises loop current checkout gear, can be used in whether loop current is connect to reverse-examination survey, this function completing with loop-coupled loop self-test unit in loop current checkout gear, in addition, this loop self-test unit can also, for whether water heater magnesium rod is exhausted and detected, will be described in detail in subsequent embodiment.
A kind of schematic diagram of the loop current checkout gear that Fig. 1 provides for the embodiment of the present invention, as shown in Figure 1,
This loop detector comprises: loop self-test unit 0, sampling resistor 2 and voltage stabilizing provide unit 3.
Wherein, loop mainly consists of first input end 01, the second input 02 and sampling resistor 2, and voltage stabilizing provides unit 3 to be connected to loop self-test unit 0 to think that loop self-test unit 0 provides and detect loop and whether connect anti-reference voltage.
In order to facilitate loop self-test unit 0 whether to connect anti-detection for loop, can first by a signal amplifier, to signal, first amplify, by the output of signal amplifier and reference voltage are compared to judge whether loop connects instead.The structure chart of this situation can be as shown in Figure 2, and now loop current checkout gear comprises loop self-test unit 0, and input signal control module 1, sampling resistor 2, voltage stabilizing provide unit 3, signal amplification unit 4 and alarm unit 5.
The break-make that wherein input signal control module 1 is controlled by first input end 01, the second input 02 and loop that sampling resistor 2 forms, when first input end 01 and the second input 02 access water heater, the circuit communication that first input end 01, the second input 02 and sampling resistor 2 form, the electric current in loop forms voltage signal through sampling resistor 2.
The signal of the voltage input signal of input circuit (being the voltage signal of first input end 01) and reference voltage is (being output voltage V out) input circuit self-test unit 0 after the amplification of signal amplification unit 4, and alarm unit 5 is reported to the police according to the testing result of loop self-test unit 0.
Voltage stabilizing provides unit 3 whether to connect anti-reference voltage for loop self-test unit 0 provides detection loop, and when there is no voltage input signal, output voltage V out also can be fixed on certain voltage.
Whether loop self-test unit 0 connects instead for detection of loop on the one hand, for example, when loop self-test unit 0 judges that Vout is greater than reference voltage, judges first input end 01 and the second input 02 connects instead.In addition, if this loop self-test unit 0 consumes detection for carrying out the magnesium rod of water heater, first input end 01 is externally connected to water heater housing, such as water heater liner, the second input 02 externally connects the magnesium rod of water heater, via the control of input signal control module 1, magnesium rod and the sampling resistor 2 of water heater liner, water heater have just formed loop like this, and electric current forms voltage signal through sampling resistor 2.Voltage stabilizing provides unit 3 whether to connect anti-reference voltage for loop self-test unit 0 provides detection loop, and the voltage input signal of input circuit and the signal of reference voltage amplify and form Vout input circuit self-test unit 0 via signal amplifier 4.When Vout is greater than default alarm threshold value, loop self-test unit 0 detects magnesium rod and exhausts, and alarm unit 5 is reported to the police and indicated the magnesium rod of water heater to exhaust.Below in conjunction with following two embodiment, the possible structure of above-mentioned loop current checkout gear is described in detail.
Embodiment mono-,
The structure chart of the loop current checkout gear that Fig. 3 provides for the embodiment of the present invention one, in the loop current checkout gear shown in this embodiment, externally correct being connected to of terminal XS1: I pin is first input end 01, it externally connects water heater liner, the II pin of terminal XS1 is the second input 02, and it externally connects the magnesium rod of water heater.
The reverse input end (being connected to the inverting input of operational amplifier 44 in Fig. 3 through the 5th resistance 41) that connects signal amplification unit 4 in 01 pair of first input end, being internally connected to voltage stabilizing provides in the common node of the output of unit 3 and the positive input of signal amplification unit 4.That is to say that the magnesium rod of water heater liner and water heater is by terminal XS1 place in circuit.Input signal control module 1 in the present embodiment is the normally closed switch in parallel with sampling resistor 2, when in detected state, this normally closed switch 1 is pressed, and water heater liner, magnesium rod and sampling resistor 2 just form a loop, and the electric current in loop just forms voltage signal through sampling resistor.Wherein the two ends of sampling resistor 2 connect respectively first input end 01 and the second input 02, and value can be 40 Ω～65 Ω, in embodiments of the present invention preferred 56 Ω.
As shown in Figure 3, the voltage stabilizing shown in the first bleeder circuit 31 and voltage follower 32 pie graphs 1 provides unit 3, and wherein the voltage division signal of the first bleeder circuit 31 outputs produces reference voltage through voltage follower 32.Voltage follower mainly plays buffer action, prevents that loop current from pouring in down a chimney to the first bleeder circuit 31, stable reference voltage.
Wherein the first bleeder circuit 31 comprises the first resistance 34 and the second resistance 35, a termination supply voltage Vcc of the first resistance 34 wherein, another termination second resistance 35, the second resistance 35 1 termination first resistance 34, other end ground connection.The common node output voltage division signal of the first resistance 34 and the second resistance 35 is to voltage follower 32.The first resistance 34 and the second resistance 35 can be set conventionally and make the reference voltage producing in Vcc/2 left and right, preferably the first resistance 34 is 47K Ω, and the second resistance 35 is 22K Ω.
As shown in Figure 3, voltage follower 32 is comprised of the 3rd resistance 36, the 4th resistance 37 and operational amplifier 38, and wherein the value of the 3rd resistance 36 equates with the 4th resistance 37, is preferably 10K Ω.In addition preferably, also have a filter capacitor 33, its one end is connected to the common node of the output of the first bleeder circuit 31 and the input of voltage follower 32, other end ground connection.The value of this filter capacitor 33 is less than or equal to 10uF and is greater than 1uF, in embodiments of the present invention preferred 10uF.
Signal amplification unit 4 is comprised of the 5th resistance 41, the 6th resistance 42, the 7th resistance 43 and operational amplifier 44 in the present embodiment, wherein the 5th resistance 41 one end connect first input end 01, the negative input of other end concatenation operation amplifier 44, the 6th resistance 42 one end connect the output of voltage follower 32 and the common node of the second input 02, the positive input of other end concatenation operation amplifier 44.Conventionally the ratio of choosing the 7th resistance 43 and sampling resistor 2 is less than 30, the value of the 6th resistance 42 approximates the value of the 7th resistance 43 the 5th resistance 41 in parallel, preferably the value of the 7th resistance 43 is 200K Ω, the value 10K Ω of the 5th resistance 41, and the value of the 6th resistance 42 is 10K Ω.
The output voltage V out of signal amplification unit 4 is:
wherein Vref is reference voltage,
r1 is the value of the first resistance 34, and R2 is the value of the second resistance 35, the value that I is loop current, and R8 is 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.Visible:
1), when input signal control module 1 control loop disconnects at ordinary times, I is that 0, Vout is reference voltage.
2) if signal accesses mistake, first input end 01 and the second input 02 have connect instead, and first input end 01 externally connects the magnesium rod of water heater, and the second input 02 is connection water heater liner externally, and I is less than zero, and Vout is greater than reference voltage.Utilize this feature, the loop self-test unit 0 that connects described signal amplification unit 4 can detect first input end 01 and whether the second input 02 connects instead, if Vout is greater than reference voltage, explanation connects anti-.
3) if signal access is correct, first input end 01 externally connects water heater liner, and the second input 02 externally connects the magnesium rod of water heater, and Vout is less than reference voltage.Along with the consumption of magnesium rod, I reduces gradually, and Vout increases gradually, and when magnesium rod exhausts, Vout increases to default alarm threshold value.The loop self-test unit 0 that connects described signal amplification unit 4 is when judging Vout and be greater than default alarm threshold value, and the magnesium rod that detects water heater exhausts.
In the present embodiment one, the following structure of loop self-test unit 0 concrete employing: the second bleeder circuit 61, the first comparator 62, the second comparator 63, PNP triode 64, NPN triode 65, the tenth resistance the 68, the 11 resistance the 69, the 12 resistance the 70, the 13 resistance 71 and the 18 resistance 74.As shown in Figure 3, specifically annexation is as follows:
The output of signal amplification unit 4 is connected to the common node of the reverse input end of the first comparator 62 and the positive input of the second comparator 63, the output of the second bleeder circuit 61 is connected to the positive input of the first comparator 62, and the reverse input end of the second comparator 63 is connected to the common node of the output of voltage follower 32 and the positive input of signal amplification unit 4.
The output of the first comparator 62 is by the 18 resistance 74 ground connection, one end of the 13 resistance 71 is connected to the base stage of PNP triode 64, the other end is connected to first output of comparator 62 and the common node of the 18 resistance 74, and the colelctor electrode of PNP triode 64 is connected to supply voltage by the 12 resistance 70.
The output of the second comparator 63 is connected to the base stage of NPN triode 65 by the 11 resistance 69, second output of comparator 63 and the common node of the 11 resistance 69 are connected to the common node of colelctor electrode and the 12 resistance 70 of PNP triode 64, the grounded emitter of NPN triode 65; One end of the tenth resistance 68 is connected to the common node of the base stage of the 11 resistance 69 and NPN triode 65, other end ground connection.
The second above-mentioned bleeder circuit 61 as shown in Figure 3, by the 16 resistance 75 and the 17 resistance 76, formed, by regulating the value of 16 resistance 75 and the 17 resistance 76 that the input voltage of the positive input of the first comparator 62 can be set, thereby realize the adjusting of default alarm threshold value.
Alarm unit 5 comprises: the first light emitting diode 66, the second light emitting diode the 67, the 14 resistance 72 and the 15 resistance 73.Wherein one end of the second light emitting diode 67 connects the emitter stage of PNP triode 64 by the 14 resistance 72, and the other end of the second light emitting diode 67 connects supply voltage.One end of the first light emitting diode 66 is by the 15 resistance 73 being connected to the colelctor electrode of NPN triode 65, and 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 02 is correct, in testing process, suppose that the alarm threshold value arranging by the 16 resistance 75 and the 17 resistance 76 is Vth, the input voltage of the positive input of the first comparator 62 is Vth, the alarm procedure of alarm unit 5 is specially: along with the consumption of magnesium rod, loop current I reduces gradually, Vout increases gradually, when magnesium rod exhausts, Vout increases to over Vth, the first comparator 62 output low levels, the second comparator 63 output low levels, now PNP triode 64 conductings, the second light emitting diode 67 is bright, 65 cut-offs of NPN triode, the first light emitting diode 66 goes out.
If signal access mistake, be that first input end 01 and the second input 02 have connect instead, first input end 01 externally connects the magnesium rod of water heater, the second input 02 externally connects water heater liner, I is less than zero, Vout is greater than reference voltage, alarm unit 5 accesses wrong testing process for signal: the first comparator 62 output low levels, the second comparator 63 output high level, now PNP triode 64 cut-offs, the second light emitting diode 67 goes out, 65 conductings of NPN triode, and the first light emitting diode 66 is bright.
Aspect value, 16 resistance 75 are relevant with arranging of alarm threshold value with the 17 resistance 76 values, and preferably the value of 16 resistance 75 is 47K Ω, and the value of the 17 resistance 76 is 16K Ω.When the selection of the tenth resistance 68 and the 11 resistance 69 will make the second comparator 63 output high level, 65 conductings of NPN triode.Preferably the value of the tenth resistance 68 and the 11 resistance 69 is 2.2K Ω.The 14 resistance 72 and the 15 resistance 73 are current-limiting resistance, preferably the value of the 14 resistance 72 and the 15 resistance 73 is 510 Ω, the 12 resistance 70 and the 18 resistance 74 are pull-up resistor, and preferably the value of the 12 resistance 70 and the 18 resistance 74 is 2K Ω.The 13 resistance 71 is base resistance, and preferably the value of the 13 resistance 71 is 2.2K Ω.The preferred BC847 of NPN triode 65, the preferred BC858 of PNP triode 65.
Embodiment bis-,
The structure chart of the loop current checkout gear that Fig. 4 provides for the embodiment of the present invention two, the difference that the loop current checkout gear shown in the present embodiment and embodiment mono-provide is following 2 points:
Input signal control module 1 in one, the present embodiment is the relay in parallel with sampling resistor 2, as shown in Figure 4, relay one termination supply voltage Vcc2, when not carrying out magnesium rod consumption detection, the closing of contact; When carrying out magnesium rod consumption detection, the contact of MCU control relay disconnects, thereby further controls the break-make in water heater liner, magnesium rod and loop that sampling resistor 2 forms.Further, between MCU and relay, can be connected with relay drive circuit (scheming not shown).
Two, the loop self-test unit 0 in the present embodiment comprises microcontroller 51, and alarm unit 5 comprises display screen 52 and the buzzer 53 that MCU51 connects, and wherein display screen 52 and buzzer 53 can be selected an existence, also can exist simultaneously.In the process of test signal access, MCU51 arranges reference voltage, and in MCU51 write-in program, if Vout is greater than reference voltage, MCU51 judges first input end 01 and the second input 02 connects instead, MCU51 drives buzzer 53 to report to the police, or by display screen 52 reminding user signal access mistakes.
If first input end 01 and the second input 02 access are correct, when carrying out magnesium rod consumption detection, by MCU51, alarm threshold value is set, and in MCU51 write-in program, when Vout is greater than alarm threshold value, the magnesium rod that MCU51 detects water heater exhausts, and drives buzzer 53 to report to the police, or by display screen 52 reminding user to replace magnesium rods.Here alarm threshold value can adopt experiment value or empirical value.
MCU51 exhausts when wrong with signal access magnesium rod being detected, can drive buzzer 53 to produce different sound and report to the police, or by display screen 52, carry out different promptings and show.
Other each unit are identical with embodiment mono-, do not repeat them here.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of making, be equal to replacement, improvement etc., within all should being included in the scope of protection of the invention.
Claims (14)
1. a water heater, is characterized in that, comprises loop current checkout gear, and described loop current checkout gear comprises whether be connected to detect described loop with loop connect anti-loop self-test unit (0).
2. water heater according to claim 1, is characterized in that, described loop current checkout gear also comprises: sampling resistor (2) and voltage stabilizing provide unit (3);
Loop mainly consists of first input end (01), the second input (02) and described sampling resistor (2), and described voltage stabilizing provides unit (3) to be connected to described loop self-test unit (0) to think that described loop self-test unit (0) provides and detect described loop and whether connect anti-reference voltage.
3. water heater according to claim 2, is characterized in that, described loop current checkout gear also comprises: input signal control module (1), signal amplification unit (4) and alarm unit (5);
Described input signal control module (1) is controlled the break-make in described loop;
When described circuit communication, the electric current in loop forms voltage signal through described sampling resistor (2), input the voltage input signal in described loop and the signal of described reference voltage and after the amplification of described signal amplification unit (4), input described loop self-test unit (0), described loop self-test unit (0) drives described alarm unit (5) to report to the police according to testing result.
4. according to the water heater described in claim 2 or 3, it is characterized in that, described voltage stabilizing provides unit (3) to comprise the first bleeder circuit (31) and voltage follower (32), and described reference voltage is that the voltage division signal of being exported by described the first bleeder circuit (31) produces through described voltage follower (32).
5. water heater according to claim 4, it is characterized in that, described voltage stabilizing provides unit (3) also to comprise filter capacitor (33), one end of described filter capacitor (33) is connected to the common node of the output of described the first bleeder circuit (31) and the input of described voltage follower (32), other end ground connection.
6. water heater according to claim 3, is characterized in that, described input signal control module (1) comprising: switch or the relay in parallel with described sampling resistor (2).
7. water heater according to claim 3, it is characterized in that, described the second input (02) is internally connected to described voltage stabilizing to be provided in the common node of the output of unit (3) and the positive input of described signal amplification unit (4), described first input end (01) is internally connected to the reverse input end of described signal amplification unit (4), and the two ends of described sampling resistor (2) connect respectively described first input end (01) and described the second input (02).
8. water heater according to claim 7, it is characterized in that, if the voltage of inputting described loop self-test unit (0) through described signal amplification unit (4) in test process is greater than described reference voltage, described loop self-test unit (0) detects described first input end (01) and the second input (02) connects instead.
9. water heater according to claim 3, is characterized in that, described first input end (01) externally connects water heater housing, and described the second input (02) externally connects the magnesium rod of water heater;
If input the voltage of described loop self-test unit (0), be greater than default alarm threshold value, described loop self-test unit (0) detects magnesium rod and exhausts.
10. water heater according to claim 9, is characterized in that, described water heater housing is described water heater liner.
11. according to the water heater described in claim 3 or 9, it is characterized in that, described loop self-test unit (0) comprises MCU(51).
12. water heaters according to claim 11, is characterized in that, described alarm unit (5) comprises described MCU(51) display screen (52) and/or the buzzer (53) that connect.
13. according to the water heater described in claim 3 or 9, it is characterized in that, described loop self-test unit (0) comprising: the second bleeder circuit (61), the first comparator (62), the second comparator (63), PNP triode (64), NPN triode (65), the tenth resistance (68), the 11 resistance (69), the 12 resistance (70), the 13 resistance (71) and the 18 resistance (74);
The output of described signal amplification unit (4) is connected to the common node of the reverse input end of described the first comparator (62) and the positive input of the second comparator (63), the output of described the second bleeder circuit (61) is connected to the positive input of described the first comparator (62), and the reverse input end of described the second comparator (63) is connected to the common node that described voltage stabilizing provides the output of unit (3) and the positive input of described signal amplification unit (4);
The output of described the first comparator (62) is by the 18 resistance (74) ground connection, one end of described the 13 resistance (71) is connected to the base stage of described PNP triode (64), the other end is connected to the common node of output and described the 18 resistance (74) of described the first comparator (62), and the colelctor electrode of described PNP triode (64) is connected to supply voltage by the 12 resistance (70);
The output of described the second comparator (63) is connected to the base stage of described NPN triode (65) by the 11 resistance (69), the output of described the second comparator (63) and the common node of described the 11 resistance (69) are connected to the common node of colelctor electrode and described the 12 resistance (70) of described PNP triode (64), the grounded emitter of described NPN triode (65); One end of described the tenth resistance (68) is connected to the common node of the base stage of described the 11 resistance (69) and described NPN triode (65), other end ground connection.
14. water heaters according to claim 13, is characterized in that, described alarm unit (5) comprising: the first light emitting diode (66), the second light emitting diode (67), the 14 resistance (72) and the 15 resistance (73);
One end of the second light emitting diode (67) is connected to the emitter stage of PNP triode (64) by the 14 resistance (72), the other end of described the second light emitting diode (67) connects supply voltage;
One end of described the first light emitting diode (66) is by the 15 resistance (73) being connected to the colelctor electrode of described NPN triode (65), and the other end of described the first light emitting diode (66) connects supply voltage.
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| CN201310165037.5A CN104142024B (en) | 2013-05-07 | 2013-05-07 | A kind of water heater |
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| CN201310165037.5A CN104142024B (en) | 2013-05-07 | 2013-05-07 | A kind of water heater |
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| CN104142024B CN104142024B (en) | 2018-08-07 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106092181A (en) * | 2016-06-03 | 2016-11-09 | 珠海格力电器股份有限公司 | Water heater and detection device and method thereof |
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| 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 |
| KR101526189B1 (en) * | 2013-12-30 | 2015-06-05 | 롯데알미늄 주식회사 | Fire detection apparatus in a boiler and voltage controll method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106092181A (en) * | 2016-06-03 | 2016-11-09 | 珠海格力电器股份有限公司 | Water heater and detection device and method thereof |
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