CN201233543Y - Simple temperature controller detection circuit - Google Patents
Simple temperature controller detection circuit Download PDFInfo
- Publication number
- CN201233543Y CN201233543Y CNU2008200950517U CN200820095051U CN201233543Y CN 201233543 Y CN201233543 Y CN 201233543Y CN U2008200950517 U CNU2008200950517 U CN U2008200950517U CN 200820095051 U CN200820095051 U CN 200820095051U CN 201233543 Y CN201233543 Y CN 201233543Y
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- temperature controller
- resistance
- triode
- circuit
- testing circuit
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- Control Of Resistance Heating (AREA)
Abstract
The utility model discloses a detection circuit of a simple temperature controller, which comprises a heater and a temperature controller, wherein, one end of the heater is mutually connected with one end of the temperature controller, and the other end of the heater and the other end of the temperature controller are connected to the live wire and the zero line of the output terminal of an AC power supply respectively; and the output terminal of the AC power supply is further connected with a rectifier/filter circuit which is further provided with a triode; the base electrode of the triode is connected between the temperature controller and the heater via at least one divider resistor, the emitter electrode thereof is grounded, and the collector electrode thereof, as a signal output terminal, is connected to the interface of a single-chip; and the base electrode is further grounded via a pull-down resistor. The detection circuit can conveniently detect the on/off state of the temperature controller, therefore, the detection circuit is simple, feasible and low in cost.
Description
Technical field
The utility model relates to the temperature controller detection technique, relates in particular to a kind of simple and easy temperature controller testing circuit.
Background technology
In the control circuit of electric equipment products, temperature controller is a kind of application device very widely, therefore, often needs to realize the control to heating element in the circuit by detecting the state of temperature controller.How do not increase cost, simplify under the situation of circuit as far as possible, realizing the variation of its function, is that the electric equipment products devisers are devoted to the problem studied always.
The utility model content
Technical problem to be solved in the utility model is: a kind of simple and easy temperature controller testing circuit is provided, and the temperature controller that this circuit can detect in the circuit easily is in unlatching or closed condition, simple possible, with low cost.
For solving the problems of the technologies described above, the utility model adopts following technical scheme:
A kind of simple and easy temperature controller testing circuit includes well heater, temperature controller, the live wire that an end interconnects, the other end is connected respectively to ac power output and the zero line of described well heater and temperature controller; The output terminal of described AC power also is connected with a current rectifying and wave filtering circuit, and, this circuit also is provided with a triode, the base stage of described triode by at least one divider resistance be connected between described temperature controller and the well heater, grounded emitter, collector then be connected to an one-chip machine port as signal output part, and described base stage is also by a drop-down resistance eutral grounding.
The beneficial effects of the utility model are:
Embodiment of the present utility model is by utilizing the current rectifying and wave filtering circuit effect in the circuit, and a triode generation of the end connection detection signal at temperature controller is in unlatching or closed condition thereby detect temperature controller easily, and simple possible is with low cost.
Below in conjunction with accompanying drawing the utility model is described in further detail.
Description of drawings
Fig. 1 is the circuit theory diagrams of an embodiment of the present utility model.
Fig. 2 is transistor base voltage signal synoptic diagram when temperature controller is closed among the embodiment of the present utility model.
Fig. 3 is transistor base voltage signal synoptic diagram when temperature controller disconnects among the embodiment of the present utility model.
Embodiment
With reference to figure 1, present embodiment mainly includes heater H EATER1, temperature controller S1, live wire end ACL that an end interconnects, the other end is connected respectively to ac power output and the zero line side ACN of described heater H EATER1 and temperature controller S1; The output terminal of described AC power also is connected with a current rectifying and wave filtering circuit; The resistance-capacitance depressurization circuit C1 and the R2 of the zero line input end that described current rectifying and wave filtering circuit includes the rectifier bridge that is made of four diode D1, D2, D3, D4, be arranged on described rectifier bridge and be connected voltage stabilizing diode Z1 between two output terminals of described rectifier bridge in parallel and two output terminals of filter capacitor C2 and C3 and described rectifier bridge also connect direct supply and ground respectively, wherein, also be parallel with a discharge resistance R1 on the capacitor C 1.
In addition, this circuit also is provided with a triode TR1, the base stage of described triode TR1 by divider resistance R5, R6 be connected between described temperature controller S1 and the heater H EATER1, grounded emitter, collector then be connected to an one-chip machine port I/O2 as signal output part by resistance R 4; And described base stage also also is connected with direct supply by a pull-up resistor R3 by the collector of drop-down resistance R 7 ground connection, described triode.
During specific implementation, the main flow supply voltage is that the resistance of 5V, divider resistance R5, R6 is 510K Ω in the present embodiment; The R7 resistance of described pull down resistor is 30K Ω.
Describe the circuit working principle of present embodiment below in detail.
(1) when temperature controller S1 was closed, the base voltage of triode TR1 was V
ACN* (R7/ (R5+R6+R7)), with reference to figure 2, under the effect of current rectifying and wave filtering circuit, V
ACNVoltage output signal with respect to ground GND is a square-wave signal.Therefore, triode TR1 is at V
ACNPositive half cycle conducting, negative half period end.At this moment, under the effect of the direct supply of triode TR1 collector and pull-up resistor R3, the output voltage of signal output part I/02 is a square-wave signal.
(2) when temperature controller S1 disconnects, the base voltage of triode TR1 is V
ACL* (R7/ (R5+R6+R7+R
HEATER1)), with reference to figure 3, under the effect of current rectifying and wave filtering circuit, V
ACLVoltage output signal with respect to ground is a sine wave signal.All the time under the situation less than its forward voltage, triode TR1 remains cut-off state at triode TR1 base voltage, and at this moment, under the effect of the direct supply of triode TR1 collector and pull-up resistor R3, the output voltage of signal output part I/02 is a high level.
During specific implementation, R
HEATER1Value can ignore with respect to (R5+R6+R7), when S1 disconnects, suitably choose the resistance of resistance R 7, make voltage on the resistance R 7 greater than the forward voltage of triode TR1, TR1 is ended, in the present embodiment, base-on voltage with triode is that 0.7V considers, with reference to figure 3, with V
ACLFor 5.8V calculates, the resistance that can get resistance R 7 should be less than 123K Ω.For guaranteeing that triode TR1 reliably ends, the total voltage of desirable resistance (R5+R6+R7) is that 25V considers, according to (R7/ (510k+510k+R7)) * 25=0.7V, the resistance that then gets resistance R 7 is 30K Ω.
In sum, in the present embodiment, when S1 was closed, the output voltage signal of signal output part I/02 was a square-wave signal; When S1 disconnected, the output voltage signal of signal output part I/02 was a high level signal.Therefore, the waveform of the output voltage signal by detection signal output terminal I/02 can judge that temperature controller is in closure or off-state.
The above is a preferred implementation of the present utility model; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the utility model principle; can also make some improvements and modifications, these improvements and modifications also are considered as protection domain of the present utility model.
Claims (5)
1, a kind of simple and easy temperature controller testing circuit includes well heater, temperature controller, the live wire that an end interconnects, the other end is connected respectively to ac power output and the zero line of described well heater and temperature controller; The output terminal of described AC power also is connected with a current rectifying and wave filtering circuit, it is characterized in that:
This circuit also is provided with a triode, the base stage of described triode by at least one divider resistance be connected between described temperature controller and the well heater, grounded emitter, collector then be connected to an one-chip machine port as signal output part, and described base stage is also by a drop-down resistance eutral grounding.
2, simple and easy temperature controller testing circuit as claimed in claim 1, it is characterized in that the resistance-capacitance depressurization circuit of the zero line input end that described current rectifying and wave filtering circuit includes the rectifier bridge that is made of four diodes, be arranged on described rectifier bridge and be connected voltage stabilizing diode between two output terminals of described rectifier bridge in parallel and two output terminals of filter capacitor and described rectifier bridge also connect direct supply and ground respectively.
3, simple and easy temperature controller testing circuit as claimed in claim 2 is characterized in that, the collector of described triode also is connected with direct supply by a pull-up resistor.
4, as each described simple and easy temperature controller testing circuit among the claim 1-3, it is characterized in that, be connected with two divider resistances between the base stage of described triode and temperature controller, the well heater, and the resistance of described two divider resistances is the resistance of 510K Ω, described pull down resistor less than 123K Ω.
5, simple and easy temperature controller testing circuit as claimed in claim 4 is characterized in that, the resistance of described pull down resistor is 30K Ω.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200950517U CN201233543Y (en) | 2008-06-24 | 2008-06-24 | Simple temperature controller detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200950517U CN201233543Y (en) | 2008-06-24 | 2008-06-24 | Simple temperature controller detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201233543Y true CN201233543Y (en) | 2009-05-06 |
Family
ID=40619924
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200950517U Expired - Fee Related CN201233543Y (en) | 2008-06-24 | 2008-06-24 | Simple temperature controller detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201233543Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107491064A (en) * | 2017-10-14 | 2017-12-19 | 厦门芯阳科技股份有限公司 | A kind of water pump concatenation temperature controller control circuit and temperature controller condition detection method |
-
2008
- 2008-06-24 CN CNU2008200950517U patent/CN201233543Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107491064A (en) * | 2017-10-14 | 2017-12-19 | 厦门芯阳科技股份有限公司 | A kind of water pump concatenation temperature controller control circuit and temperature controller condition detection method |
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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: 20090506 Termination date: 20170624 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |