CN210461871U - Safety circuit and gas heater - Google Patents
Safety circuit and gas heater Download PDFInfo
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- CN210461871U CN210461871U CN201921184180.8U CN201921184180U CN210461871U CN 210461871 U CN210461871 U CN 210461871U CN 201921184180 U CN201921184180 U CN 201921184180U CN 210461871 U CN210461871 U CN 210461871U
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Abstract
The utility model provides a safety circuit and gas heater, this safety circuit includes: the driving circuit comprises a driving tube, a capacitor, a first resistor, a second resistor and a third resistor, wherein the first end of the driving tube is connected with one end of the capacitor, the other end of the capacitor is connected with one end of the third resistor, and the other end of the third resistor is used as a signal input end and is connected with a controller; the second end of the driving tube is connected with one end of a first resistor, the other end of the first resistor is used for connecting a power supply, and the second end is used as a signal output end and is connected with a solenoid valve driving unit; the third end of the driving tube is grounded, and the two ends of the second resistor are respectively connected with the first end and the third end of the driving tube. According to the technical scheme of the utility model, can guarantee gas solenoid valve driven definite state and closed state when the software control logic of water heater breaks down to can improve gas water heater's security and reliability etc..
Description
Technical Field
The utility model relates to a gas heater technical field especially relates to a safety circuit and gas heater.
Background
The control circuit in the existing gas water heater mainly controls the conduction or the closing of the triode through a pin of the controller to control the electromagnetic valve driving unit of the gas water heater, and then the gas electromagnetic valve of the gas water heater is switched on or off.
The normal work of the gas water heater needs to be controlled by combining software, however, in the actual application process, once software fails, the state of a pin of the controller is uncertain, if the state is high level or low level, the output of a triode is further caused to be low level or high level, namely, the triode is in an uncertain state, and finally the switching state of the gas electromagnetic valve is in an uncertain state, so that certain potential safety hazard is brought.
SUMMERY OF THE UTILITY MODEL
In view of this, the present invention provides a safety circuit and a gas water heater, which can solve the problem of keeping the gas solenoid valve closed all the time when software fails.
The utility model provides a safety circuit, include: the driving circuit comprises a driving tube, a capacitor, a first resistor and a second resistor, wherein the first end of the driving tube is connected with one end of the capacitor, and the other end of the capacitor is used as a signal input end and is connected with a controller;
the second end of the driving tube is connected with one end of the first resistor, the other end of the first resistor is used for connecting a power supply, and the second end is used as a signal output end and is connected with an electromagnetic valve driving unit;
the third end of the driving tube is grounded, and the two ends of the second resistor are respectively connected with the first end and the third end of the driving tube.
Further, in the above safety circuit, the method further includes: and one end of the third resistor is used as the signal input end, and the other end of the third resistor is connected with the other end of the capacitor.
Further, in the above safety circuit, the method further includes: and the fourth resistor is positioned between the first resistor and the second end of the driving tube, and a potential point between the fourth resistor and the first resistor is used as the signal output end.
Further, in the above safety circuit, the method further includes: one end of the fifth resistor is connected with the first end of the driving tube, and the other end of the fifth resistor is connected with one end of the second resistor and the one end of the capacitor respectively.
Further, in the above safety circuit, the method further includes: and the protection tubes are connected to two ends of the second resistor in parallel.
Further, in the above safety circuit, the method further includes: and the first end of the electromagnetic valve driving unit is connected with the signal output end, the second end of the electromagnetic valve driving unit is connected with the power supply, and the third end of the electromagnetic valve driving unit is used for connecting an electromagnetic valve.
Further, in the above safety circuit, the signal input at the signal input terminal is a sine wave, a rectangular wave or a pulse width modulation signal with an adjustable duty ratio.
Further, in the above safety circuit, the driving transistor is a triode or an MOS transistor.
Further, in the safety circuit, the protection tube is a voltage regulator tube or a diode.
Another embodiment of the utility model provides a gas water heater, including controller, safety circuit, solenoid valve drive unit and the gas solenoid valve that connects gradually, wherein, safety circuit adopts foretell safety circuit.
The embodiment of the utility model has the following advantage:
the capacitor used for passing through the alternating current resistor is additionally arranged in front of the control end of the driving pipe, and the state of the driving pipe is controlled by the alternating signal, so that when the software control logic of the water heater breaks down, the determined state and the closed state of the driving of the gas electromagnetic valve can be ensured, and the safety, the reliability and the like of the gas water heater can be improved.
In order to make the aforementioned and other objects, features and advantages of the present invention more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 shows a first schematic diagram of a safety circuit according to an embodiment of the present invention;
fig. 2 shows a first application diagram of a safety circuit according to an embodiment of the present invention;
fig. 3 shows a second schematic diagram of the safety circuit according to the embodiment of the present invention;
fig. 4 shows a schematic diagram of a second application of the safety circuit according to an embodiment of the present invention;
FIG. 5 illustrates the waveform of the safety circuit of an embodiment of the present invention under normal conditions of a gas water heater;
fig. 6A and 6B respectively show two waveforms of the safety circuit of the embodiment of the present invention under the abnormal condition of the gas water heater.
Description of the main element symbols:
100-a safety circuit; q1-drive tube; c1-capacitance; r1 — first resistance; r2 — second resistance;
r3 — third resistance; r4-fourth resistor; r5-fifth resistor; d1-diode.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly on" another element, there are no intervening elements present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the templates herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Example 1
Referring to fig. 1, the present embodiment provides a safety circuit 100, which can be applied to a gas water heater, and the safety circuit 100 can effectively ensure a certain state of driving a gas solenoid valve and a closing state of the solenoid valve when a software control logic of the water heater fails, so as to improve safety and reliability of the water heater. The safety circuit 100 is described in detail below.
As shown in fig. 1, the safety circuit 100 includes a driving transistor Q1, a capacitor C1, a first resistor R1, and a second resistor R2, wherein a first end of the driving transistor Q1 is connected to one end of the capacitor C1, and the other end of the capacitor C1 is used as a signal input end for connecting to a controller. The second end of the driving tube Q1 is connected to one end of the first resistor R1, and the other end of the first resistor R1 is used for connecting a power supply. The second end of the driving pipe Q1 is used as a signal output end and is connected with a solenoid valve driving unit; the third terminal of the driving transistor Q1 is grounded, wherein two terminals of the second resistor R2 are respectively connected to the first terminal and the third terminal of the driving transistor Q1. It is understood that the first resistor R1 and the second resistor R2 both function to limit current.
In this embodiment, the signal input at the signal input end may include but is not limited to a sine wave, a sawtooth wave, a rectangular wave, or the like, wherein the square wave is a special rectangular wave; a triangular wave is a special sawtooth wave. Of course, the input control signal may also be a pulse width modulation signal (i.e., PWM signal) with an adjustable duty ratio, or the like. It is understood that the input signal is an alternating signal except for direct current, i.e. the driving tube Q1 can be controlled by the capacitor C1.
The driving pipe Q1 is used for adding driving capability to the signal input by the controller and converting the signal into a control signal for controlling the solenoid valve driving unit. Exemplarily, the driving transistor Q1 may include, but is not limited to, a transistor, a MOS transistor, and the like, wherein the transistor is further divided into an NPN transistor and a PNP transistor; the MOS tube is divided into a P-channel MOS tube and an N-channel MOS tube.
Further, as shown in fig. 1, the safety circuit 100 further includes a third resistor R3, one end of the third resistor R3 is used as the signal input terminal, and the other end is connected to the other end of the capacitor C1. It is understood that the third resistor R3 is located between the controller and the driving transistor Q1, and mainly functions as a voltage divider, and of course, if the voltage of the input signal is too large, the third resistor R3 may also function to protect the driving transistor Q1.
For example, as shown in fig. 2, when the driving transistor Q1 is an NPN transistor, the first terminal, the second terminal and the third terminal of the driving transistor Q1 correspond to the base, the collector and the emitter of the NPN transistor, respectively. Then, the base of the NPN type triode is connected in sequence with the capacitor C1 and the third resistor R3, and the other end of the third resistor R3 will be used as a signal input end; the collector of the NPN type triode is used as a signal output end, namely, a signal for controlling the electromagnetic valve driving unit is output; while its emitter is grounded.
Optionally, as shown in fig. 3, the safety circuit 100 further includes a fourth resistor R4, the fourth resistor R4 is located between the first resistor R1 and the second end of the driving tube Q1, wherein an arbitrary potential point between the fourth resistor R4 and the first resistor R1 is used as a signal output end, i.e., a control signal for controlling the solenoid valve driving unit is output from between the fourth resistor R4 and the first resistor R1. It can be understood that the fourth resistor R4 mainly functions as a voltage divider, and when the driving tube Q1 is turned on, the solenoid valve driving unit can be more reliably turned on or off due to the voltage divider of the fourth resistor R4.
Optionally, the safety circuit 100 further includes a fifth resistor R5, one end of the fifth resistor R5 is connected to the first end of the driving transistor Q1, and the other end of the fifth resistor R5 is connected to one end of the second resistor R2 and the one end of the capacitor C1, respectively. It can be understood that the fifth resistor R5 plays a role in limiting current and protecting, and can prevent the driving transistor Q1 from being damaged when the voltage signal inputted by the controller is too large or transient spike voltage occurs.
Optionally, the safety circuit 100 further includes a protection tube connected in reverse parallel to two ends of the second resistor R2, which is also understood to be reversely disposed at the first end and the third end of the driving tube Q1. Preferably, the protection tube may be a voltage regulator tube or a diode. For example, as shown in fig. 4, the protection tube is a diode D1 disposed in a reverse direction.
It can be understood that the voltage across the first terminal and the third terminal of the driving transistor Q1 can be a stable voltage value by arranging the inverted protection tube, i.e. it acts as a limiter, so as to prevent the driving transistor Q1 from being broken down and damaged when the input signal is too large.
Optionally, as shown in fig. 3, the safety circuit 100 further includes a solenoid valve driving unit, wherein a first end of the solenoid valve driving unit is connected to the signal output end, that is, a first end of the solenoid valve driving unit is respectively connected to the first resistor R1 and the fourth resistor R4; the second end of the electromagnetic valve driving unit is connected with a power supply, and the third end of the electromagnetic valve driving unit is used for connecting an electromagnetic valve. In this embodiment, the electromagnetic valve driving unit is used for driving and controlling a gas electromagnetic valve in a water heater. Exemplarily, the electromagnetic valve driving unit mainly comprises a driving circuit formed by a triode or an MOS transistor, wherein the triode is further divided into an NPN-type triode and a PNP-type triode; the MOS tube is divided into a P-channel MOS tube and an N-channel MOS tube.
For example, as shown in fig. 4, if the solenoid driving unit is a P-channel MOS transistor Q2, the first terminal, the second terminal and the third terminal of the solenoid driving unit correspond to the gate, the source and the drain of the P-channel MOS transistor Q2, respectively. Then, the grid is connected with the signal output end and used for receiving the output control signal; the source electrode is connected with a power supply and used for providing required working voltage; the drain electrode is connected with the gas electromagnetic valve and used for executing opening or closing operation according to the control signal.
As an alternative, as shown in fig. 3, the safety circuit 100 further includes a controller, and a control pin of the controller is connected to the other end of the capacitor C1. Of course, if the safety circuit 100 includes the third resistor R3, the control pin of the controller will be connected to the other end of the third resistor R3. The controller may be, for example, a different type of single chip or micro control chip, etc.
The operation of the safety circuit 100 in a gas water heater will now be explained.
When the gas water heater works normally, the controller inputs an alternating signal, and the capacitor C1 has the alternating current characteristic, so that the alternating signal can pass through and conduct or close the driving pipe Q1 to enable the electromagnetic valve driving unit to drive the gas electromagnetic valve to be opened or closed, and the normal control process is achieved.
When the software of the gas water heater breaks down, the control pin of the controller is in a level uncertain state, possibly a low level or a high level, because the capacitor C1 has a DC resistance characteristic, the high level or the low level cannot pass through, the driving pipe Q1 keeps a closed state at the moment, and the electromagnetic valve driving unit cannot drive the gas electromagnetic valve to be opened, so that the reliability, the safety and the like of the gas water heater under the condition of the fault can be ensured.
Exemplarily, based on the safety circuit 100 of fig. 2, fig. 5, 6A and 6B show waveform diagrams of test points in the safety circuit 100 under normal conditions and in the event of a failure of a water heater, respectively.
When the software control logic of the water heater is normal, as shown in fig. 5, a PWM waveform a output from the signal input terminal can be detected, the voltage amplitude is 5V, and the duty ratio is 60%. The waveform b is the waveform of the end of the capacitor C1 close to the drive tube Q1. It can be seen that the PWM signal can be passed through the capacitor C1 and input into the first terminal of the drive tube Q1. The waveform c is the waveform of the control signal outputted through the driving tube Q1, i.e. the output waveform of the second end of the driving tube Q1. It can be seen that waveform c for controlling the solenoid valve driving unit is the same frequency as waveform a.
When the software control logic of the water heater is abnormal, as shown in fig. 6A, when it is detected that the signal input end outputs a high level signal, the voltage amplitude is 5V, and the waveform b is the waveform of the end of the capacitor C1 close to the driving tube Q1. It can be seen that the high level of current cannot pass through the capacitor C1, and the waveform b will always be low; accordingly, the waveform c driving the second end of the tube Q1 will continue to output a high level.
As shown in fig. 6B, when it is detected that the signal input terminal outputs a low level signal, whose voltage amplitude is 0V, the waveform B of the end of the capacitor C1 close to the driving tube Q1 will always detect a low level; accordingly, the waveform c driving the second end of the tube Q1 will continue to output a high level.
The safety circuit provided by the embodiment is applied to the water heater, and can effectively solve the problems that when the software control logic of the water heater breaks down, the gas electromagnetic valve is driven to be always in a determined level state, the closing state of the gas electromagnetic valve is guaranteed, and the like, so that the reliability, the safety and the like of the gas water heater can be improved.
Example 2
Referring to fig. 1, the present embodiment provides a gas water heater, which includes a safety circuit for controlling an open or close state of a gas electromagnetic valve in the gas water heater. The safety circuit 100 in embodiment 1 can be used as the safety circuit.
Exemplarily, the safety circuit 100 includes a driving tube Q1, a capacitor C1, a first resistor R1, and a second resistor R2, wherein a first end of the driving tube Q1 is connected to one end of the capacitor C1, and another end of the capacitor C1 is used as a signal input end for connecting to a controller; a second end of the driving pipe Q1 is connected with one end of the first resistor R1, the other end of the first resistor R1 is used for connecting a power supply, and the second end is used as a signal output end for connecting a solenoid valve driving unit; the third end of the driving tube Q1 is grounded, and two ends of the second resistor R2 are respectively connected with the first end and the third end of the driving tube Q1.
It is to be understood that the safety circuit in the gas water heater of the present embodiment corresponds to the safety circuit in embodiment 1, and the alternatives in embodiment 1 are also applicable to the present embodiment, so that the detailed description is omitted here.
In all examples shown and described herein, any particular value should be construed as merely exemplary, and not as a limitation, and thus other examples of example embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
The above-described embodiments are merely illustrative of several embodiments of the present invention, which are described in detail and specific, but not intended to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention.
Claims (10)
1. A safety circuit, comprising: the driving circuit comprises a driving tube, a capacitor, a first resistor and a second resistor, wherein the first end of the driving tube is connected with one end of the capacitor, and the other end of the capacitor is used as a signal input end and is connected with a controller;
the second end of the driving tube is connected with one end of the first resistor, the other end of the first resistor is used for connecting a power supply, and the second end is used as a signal output end and is connected with an electromagnetic valve driving unit;
the third end of the driving tube is grounded, and the two ends of the second resistor are respectively connected with the first end and the third end of the driving tube.
2. The safety circuit of claim 1, further comprising: and one end of the third resistor is used as the signal input end, and the other end of the third resistor is connected with the other end of the capacitor.
3. The safety circuit of claim 1, further comprising: and the fourth resistor is positioned between the first resistor and the second end of the driving tube, and a potential point between the fourth resistor and the first resistor is used as the signal output end.
4. The safety circuit of claim 1, further comprising: one end of the fifth resistor is connected with the first end of the driving tube, and the other end of the fifth resistor is connected with one end of the second resistor and the one end of the capacitor respectively.
5. The safety circuit of claim 1, further comprising: and the protection tubes are connected to two ends of the second resistor in parallel.
6. The safety circuit of claim 1, further comprising: and the first end of the electromagnetic valve driving unit is connected with the signal output end, the second end of the electromagnetic valve driving unit is connected with the power supply, and the third end of the electromagnetic valve driving unit is used for connecting an electromagnetic valve.
7. The safety circuit according to claim 1, wherein the signal input from the signal input terminal is a sine wave, a sawtooth wave, a rectangular wave or a pulse width modulation signal with adjustable duty ratio.
8. The safety circuit according to claim 1, wherein the driving transistor is a triode or a MOS transistor.
9. The safety circuit according to claim 5, wherein the protection tube is a voltage regulator tube or a diode.
10. A gas water heater comprising a safety circuit according to any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921184180.8U CN210461871U (en) | 2019-07-25 | 2019-07-25 | Safety circuit and gas heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921184180.8U CN210461871U (en) | 2019-07-25 | 2019-07-25 | Safety circuit and gas heater |
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| Publication Number | Publication Date |
|---|---|
| CN210461871U true CN210461871U (en) | 2020-05-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921184180.8U Active CN210461871U (en) | 2019-07-25 | 2019-07-25 | Safety circuit and gas heater |
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| CN (1) | CN210461871U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110307379A (en) * | 2019-07-25 | 2019-10-08 | 深圳市享往科技有限公司 | A kind of safety circuit and gas heater |
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2019
- 2019-07-25 CN CN201921184180.8U patent/CN210461871U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110307379A (en) * | 2019-07-25 | 2019-10-08 | 深圳市享往科技有限公司 | A kind of safety circuit and gas heater |
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