CN204028032U - A kind of inner container of electric water heater corrosion detection circuitry - Google Patents
A kind of inner container of electric water heater corrosion detection circuitry Download PDFInfo
- Publication number
- CN204028032U CN204028032U CN201420415368.XU CN201420415368U CN204028032U CN 204028032 U CN204028032 U CN 204028032U CN 201420415368 U CN201420415368 U CN 201420415368U CN 204028032 U CN204028032 U CN 204028032U
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- circuit
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- chip microcomputer
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- voltage collection
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Abstract
The utility model provides a kind of inner container of electric water heater corrosion detection circuitry, it is characterized in that: the constant current source that the voltage collection circuit of being controlled by on-off circuit and the magnesium rod of take are load is connected in parallel; Single-chip microcomputer outputs a control signal to the duty that on-off circuit is adjusted voltage collection circuit; Voltage collection circuit is connected with amplifying circuit, the magnitude of voltage that voltage collection circuit gathers current source loads two ends amplifies and exports described single-chip microcomputer to by described amplifying circuit, and the magnitude of voltage that single-chip microcomputer amplifies input by detection judges whether the inner bag of electric heater is corroded.After the utility model utilizes magnesium rod to switch on, in corrosion process, resistance value constantly becomes large principle, the resistance value of variation is changed into the magnitude of voltage of real-time change, and adopt software to judge that this magnitude of voltage is whether in predefined scope, if magnitude of voltage is larger than predefined, judge that magnesium rod is about to approach exhaustion, inner bag is corroded, otherwise inner bag is not corroded.
Description
Technical field
The utility model relates to a kind of testing circuit, relates in particular to a kind of testing circuit whether being corroded for detection of inner container of electric water heater, belongs to electric circuit inspection technical field.
Background technology
At present; storage-type electric water heater all adopts enamel inner container or stainless steel inner container substantially; for prevent enamel inner container or stainless steel inner container in long-term use procedure because there is the phenomenon of leaking in corrosion; magnesium rod is installed conventionally in inner bag; the ion characteristic of magnesium is more active than inner bag metal material; in corrosion process, can replace inner bag to be consumed by preferential corrosion, namely in the mode of sacrificial anode magnesium rod, inner bag be carried out to anti-corrosion protection.Conventionally the serviceable life that each magnesium rod designs when dispatching from the factory is roughly the same, but due to various places water quality, the otherness of the factors such as the quality of liner material and environment for use, is also not quite similar the spending rate of magnesium rod.If magnesium rod approach exhaustion and not changing in time, inner bag will be corroded and produce leak, if too early replacing magnesium is excellent, can cause waste, therefore, needs at present the Expenditure Levels that a kind of testing circuit detects magnesium rod in water heater liner badly.
Utility model content
In order to solve the deficiency in background technology, the purpose of this utility model is to overcome the defect of background technology, and a kind of inner container of electric water heater corrosion detection circuitry is provided, and can detect accurately the Expenditure Levels of magnesium rod in water heater liner after use.
For achieving the above object, the technical solution adopted in the utility model is: the constant current source that the voltage collection circuit of being controlled by on-off circuit and the magnesium rod of take are load is connected in parallel;
Whether described on-off circuit is connected with single-chip microcomputer, control described voltage collection circuit work by the described on-off circuit of exporting to of described single-chip microcomputer;
Described voltage collection circuit is connected with amplifying circuit, described voltage collection circuit gathers the magnitude of voltage at the load magnesium rod two ends of described constant current source, export to after described amplifying circuit amplifies and feed back to described single-chip microcomputer, the magnitude of voltage that described single-chip microcomputer feeds back by detection judges whether the inner bag of electric heater is corroded.
In preferred embodiment of the utility model, further comprise that described voltage collection circuit is the magnesium rod pure resistor element circuit forming in parallel with a resistor.
In preferred embodiment of the utility model, further comprise and in described amplifying circuit, comprise the first differential amplifier, the second amplifier; The positive terminal pin of the first differential amplifier and negative phase end pin are connected to respectively the two ends of described voltage collection circuit pressure drop by two input resistances, the forward end pin of the first differential amplifier is also connected to its output terminal by the first feedback resistance, the in-phase end of output terminal second amplifier of the first amplifier connects, the negative phase end of the second amplifier is connected to its output terminal by the second feedback resistance, and the output terminal of the second amplifier is connected to described single-chip microcomputer.
In preferred embodiment of the utility model, further comprise that described on-off circuit comprises a switch triode, the base stage of described switch triode is connected with described single-chip microcomputer by current-limiting resistance, and collector is connected with analog power by a relay, emitter be connected in analog.
In preferred embodiment of the utility model, further comprise and between described voltage collection circuit and amplifying circuit, be also connected with filtering circuit.
Usefulness of the present utility model is: after the utility model utilizes magnesium rod to switch on, in corrosion process, resistance value constantly becomes large principle, the resistance value constantly changing is changed into the magnitude of voltage of real-time change, by voltage collection circuit, gather the magnitude of voltage of this real-time change, adopt software decision voltage value whether in predefined scope, if it is larger than predefined magnitude of voltage to gather the magnitude of voltage coming, judge that magnesium rod is about to approach exhaustion, inner bag is corroded, need to change as early as possible magnesium rod, otherwise inner bag is not corroded, without changing magnesium rod, voltage collection circuit is the magnesium rod pure resistor element circuit forming in parallel with a resistor, can guarantee that the load circuit of high precise current source when magnesium rod approach exhaustion is equivalent to open a way is still in channel status, be unlikely to damage constant current source, so that the continuous firing the utility model circuit structure that affects whole testing circuit is simple, cost is low, magnitude of voltage accuracy of detection is high.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
Fig. 1 is the testing circuit figure of the utility model preferred embodiment.
In figure: 10, voltage collection circuit, 20, constant current source, 30, on-off circuit, 40, single-chip microcomputer, 50, amplifying circuit, 60, filtering circuit.
Fig. 2 is voltage collection circuit in the utility model
In figure: 101, parallel resistance, 102, magnesium rod.
Embodiment
In order to make those skilled in the art person understand better the utility model scheme, and above-mentioned purpose of the present utility model, feature and advantage can be become apparent more, below in conjunction with embodiment and embodiment accompanying drawing, the utility model is described in further detail.
As shown in Figure 1, a kind of inner container of electric water heater corrosion detection circuitry, the voltage collection circuit 10 of being controlled by on-off circuit 30 (magnesium rod) is connected in parallel for the constant current source 20 of load, after magnesium rod is communicated with, its electric current is steady current, and along with magnesium rod is corroded, the resistance value of magnesium rod itself becomes large, it is large that the voltage difference at its two ends also becomes gradually, constantly becomes large magnitude of voltage (voltage collection circuit 10) and input to amplifying circuit 50.
Whether on-off circuit 30 is connected with single-chip microcomputer 40, receives the output signal of cause single-chip microcomputer 40, control voltage collection circuit 10 work by on-off circuit 30;
Voltage collection circuit 10 is connected with amplifying circuit 50, the magnitude of voltage (voltage collection circuit 10) that constant current source 20 produces by magnesium rod exports single-chip microcomputer 40 to after amplifying circuit 50 amplifies, and the magnitude of voltage size after single-chip microcomputer 40 amplifies by detection judges whether the inner bag of electric heater is corroded.
Principle of work of the present utility model is such: the magnitude of voltage (voltage collection circuit 10) that constant current source 20 produces by magnesium rod, the magnitude of voltage of this variation exports single-chip microcomputer 40 to after amplifying by the differential comparison with reference voltage again after amplifying processing, single-chip microcomputer 40 compares the magnitude of voltage of input and predefined magnitude of voltage, if be greater than predefined magnitude of voltage, judge that magnesium rod is about to approach exhaustion, inner bag is corroded, need to change as early as possible magnesium rod, if be less than predefined magnitude of voltage, judge that magnesium rod will not soon run out of, inner bag is not corroded.
Voltage collection circuit of the present utility model is the magnesium rod pure resistor element circuit forming in parallel with a resistor (voltage collection circuit 10), and by high precise current source 20, two ends produce voltage, complete voltage acquisition.When magnesium rod approach exhaustion is equivalent to open a way in circuit, the circuit in parallel with it still can guarantee that whole voltage collection circuit is in channel status, avoid using magnesium rod as unique load, the situation of damaging constant current source when magnesium rod approach exhaustion open circuit occurs, and guarantees the continuous firing of whole testing circuit.Concrete, in described amplifying circuit, comprise the first differential amplifier U1B, the second amplifier U1A; Positive terminal pin 5 and the negative phase end pin 6 of the first differential amplifier U1B are connected to respectively ends A, the B of described voltage collection circuit pressure drop by two input resistance R4, R3, the forward end pin 5 of the first differential amplifier U1B is also connected to its output terminal 7 by the first feedback resistance R5, the in-phase end 3 of the output terminal 7 second amplifier U1A of the first differential amplifier U1B connects, the output terminal 1 that the negative phase end 2 of the second amplifier U1A is connected to its output terminal 1, the second amplifier U1A by the second feedback resistance R7, R8 is connected to described single-chip microcomputer 40.
The change in voltage collecting in reference voltage and Acquisition Circuit 10 in real work is all very little, in order to drive the work of follow-up single-chip microcomputer 40 and the variation of load both end voltage value to be entered to accurate reflection, the first differential amplifier U1B is by the magnitude of voltage differential amplification output gathering, the second amplifier U1A again amplifies the magnitude of voltage after the first differential amplifier U1B differential amplification output and exports single-chip microcomputer 40 to, to drive 40 pairs of magnitudes of voltage of single-chip microcomputer to identify judgement.
Concrete, described on-off circuit 30 comprises a switch triode Q1, and the base stage of described switch triode Q1 is connected with single-chip microcomputer 40 by a current-limiting resistance R9, and collector is connected with analog power VDD by a relay K 1, and emitter is connected with GND in analog.When single-chip microcomputer 40 is given base stage one low level of switch triode Q1, switch triode Q1 conducting, relay K 1 adhesive conducting, the short circuit of magnesium rod, does not at this moment have pressure drop on voltage collection circuit 10, otherwise, when single-chip microcomputer 40 is given base stage one high level of switch triode Q1, switch triode Q1 cut-off, relay K 1 disconnects, and constant current source 20 becomes loop by magnesium clavate, two ends at magnesium rod (voltage collection circuit 10) produce pressure drop, complete voltage acquisition.
In order to improve the accuracy of detection of testing circuit, between voltage collection circuit 10 and amplifying circuit 50, be also connected with filtering circuit 60, described filtering circuit is the filtering of typical direct earth capacitance formula, filtering inputs to the alternating component in the signal of the first differential amplifier U1B, reduce ripple value, in order to avoid ripple causes the distortion of follow-up amplifying signal after amplifying, thereby affect the precision of testing circuit.
Above-described embodiment is preferably embodiment of the utility model; but embodiment of the present utility model is not limited by the examples; other any do not deviate from change, the modification done under Spirit Essence of the present utility model and principle, substitutes, combination, simplify and all should be equivalent substitute mode, within being included in protection domain of the present utility model.Therefore, protection domain of the present utility model should be as the criterion with the protection domain that claim was defined.
Claims (5)
1. an inner container of electric water heater corrosion detection circuitry, is characterized in that: the constant current source (20) that the voltage collection circuit (10) of being controlled by on-off circuit (30) and the magnesium rod of take are load is connected in parallel;
Whether described on-off circuit (30) is connected with single-chip microcomputer (40), by the described on-off circuit (30) that exports to of described single-chip microcomputer (40), controlled described voltage collection circuit (10) and worked;
Described voltage collection circuit (10) is connected with amplifying circuit (50), described voltage collection circuit (10) gathers the magnitude of voltage at the load magnesium rod two ends of described constant current source (20), export to after described amplifying circuit (50) amplifies and feed back to described single-chip microcomputer (40), the magnitude of voltage that described single-chip microcomputer (40) feeds back by detection judges whether the inner bag of electric heater is corroded.
2. a kind of inner container of electric water heater corrosion detection circuitry according to claim 1, is characterized in that: described voltage collection circuit (10) is the magnesium rod pure resistor element circuit forming in parallel with a resistor.
3. a kind of inner container of electric water heater corrosion detection circuitry according to claim 2, is characterized in that: in described amplifying circuit, comprise the first differential amplifier (U1B), the second amplifier (U1A), the positive terminal pin (5) of the first differential amplifier (U1B) passes through two input resistance (R4 with negative phase end pin (6), R3) be connected to respectively the two ends (A of described voltage collection circuit pressure drop, B), the forward end pin (5) of the first differential amplifier (U1B) is also connected to its output terminal (7) by the first feedback resistance (R5), the positive terminal (3) of output terminal (7) second amplifiers (U1A) of the first differential amplifier (U1B) connects, the negative phase end (2) of the second amplifier (U1A) is by the second feedback resistance (R7, R8) be connected to its output terminal (1), the output terminal (1) of the second amplifier (U1A) is connected to described single-chip microcomputer (40).
4. a kind of inner container of electric water heater corrosion detection circuitry according to claim 2, it is characterized in that: described on-off circuit (30) comprises a switch triode (Q1), the base stage of described switch triode (Q1) is connected with described single-chip microcomputer (40) by current-limiting resistance (R9), collector is connected with analog power (VDD) by a relay (K1), and emitter is connected with (GND) in analog.
5. a kind of inner container of electric water heater corrosion detection circuitry according to claim 1, is characterized in that: between described voltage collection circuit (10) and amplifying circuit (50), be also connected with filtering circuit (60).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420415368.XU CN204028032U (en) | 2014-07-25 | 2014-07-25 | A kind of inner container of electric water heater corrosion detection circuitry |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420415368.XU CN204028032U (en) | 2014-07-25 | 2014-07-25 | A kind of inner container of electric water heater corrosion detection circuitry |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204028032U true CN204028032U (en) | 2014-12-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420415368.XU Expired - Fee Related CN204028032U (en) | 2014-07-25 | 2014-07-25 | A kind of inner container of electric water heater corrosion detection circuitry |
Country Status (1)
| Country | Link |
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| CN (1) | CN204028032U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104833081A (en) * | 2015-05-25 | 2015-08-12 | 山东新基德电器有限公司 | Water heater having anode bar loss detection prompting function and control method thereof |
-
2014
- 2014-07-25 CN CN201420415368.XU patent/CN204028032U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104833081A (en) * | 2015-05-25 | 2015-08-12 | 山东新基德电器有限公司 | Water heater having anode bar loss detection prompting function and control method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141217 Termination date: 20150725 |
|
| EXPY | Termination of patent right or utility model |