CN113364299A - Self-adaptive fire detection voltage generation circuit and fire detection equipment - Google Patents
Self-adaptive fire detection voltage generation circuit and fire detection equipment Download PDFInfo
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- CN113364299A CN113364299A CN202110712262.0A CN202110712262A CN113364299A CN 113364299 A CN113364299 A CN 113364299A CN 202110712262 A CN202110712262 A CN 202110712262A CN 113364299 A CN113364299 A CN 113364299A
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- 230000033228 biological regulation Effects 0.000 claims description 8
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23M—CASINGS, LININGS, WALLS OR DOORS SPECIALLY ADAPTED FOR COMBUSTION CHAMBERS, e.g. FIREBRIDGES; DEVICES FOR DEFLECTING AIR, FLAMES OR COMBUSTION PRODUCTS IN COMBUSTION CHAMBERS; SAFETY ARRANGEMENTS SPECIALLY ADAPTED FOR COMBUSTION APPARATUS; DETAILS OF COMBUSTION CHAMBERS, NOT OTHERWISE PROVIDED FOR
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- F23M11/04—Means for supervising combustion, e.g. windows
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Abstract
The utility model relates to a self-adaptation is examined thermal voltage and is produced circuit and examine fire equipment, this circuit include voltage adjustment circuit, voltage output circuit, feedback signal processing circuit and controller, voltage adjustment circuit connection director and voltage output circuit, feedback signal processing circuit connection director and voltage output circuit, voltage output circuit is used for connecting and examines the fire device. The output voltage of the voltage output circuit is detected through the feedback signal processing circuit, the obtained sampling voltage is sent to the controller, the controller adjusts the voltage transmitted to the voltage output circuit by the voltage adjusting circuit according to the sampling voltage, so that the output voltage of the voltage output circuit is within a preset range, the stability of the fire detection voltage provided for the fire detection device is ensured, and the use reliability is improved.
Description
Technical Field
The application relates to the technical field of electrical equipment, in particular to a self-adaptive fire detection voltage generation circuit and fire detection equipment.
Background
Flame detection circuits are widely used in gas systems, and the principle of a flame detection circuit is that a flame voltage generation circuit generates an alternating high-voltage signal, and when a flame exists, because flame ions have the characteristic of unidirectional conduction, current is generated, and the current generates a voltage on a detection element. When no flame exists, the loop is incomplete, no current is generated, and no voltage is generated on the detection element. The presence of a flame can be determined by using a detection circuit to detect the presence of a voltage across the sensing element.
The traditional fire detection voltage generation circuit is designed by adopting unified parameters, and the fire detection voltage generation circuit can hardly generate higher fire detection voltage. In addition, depending on the use environment and the use time, the characteristics of the device itself may change to some extent, and the ignition voltage generated by the ignition voltage generating circuit may decrease. The traditional fire detection voltage generation circuit has the defect of low use reliability.
Disclosure of Invention
Therefore, it is necessary to provide a self-adaptive fire detection voltage generation circuit and fire detection equipment for solving the problem of low detection reliability of the conventional fire detection voltage generation circuit, so that the effect of effectively improving the detection reliability can be achieved.
A self-adaptive fire detection power generation circuit comprises a voltage adjusting circuit, a voltage output circuit, a feedback signal processing circuit and a controller, wherein the voltage adjusting circuit is connected with the controller and the voltage output circuit;
the feedback signal processing circuit is used for detecting the output voltage of the voltage output circuit to obtain a sampling voltage and sending the sampling voltage to the controller, and the controller is used for adjusting the voltage transmitted to the voltage output circuit by the voltage adjusting circuit according to the sampling voltage so as to enable the output voltage of the voltage output circuit to be within a preset range.
In one embodiment, the voltage regulation circuit includes a boost topology module and a buck topology module, the boost topology module connects the controller and the voltage output circuit, and the buck topology module connects the controller and the voltage output circuit.
In one embodiment, the boost topology module comprises an inductor Lu1, a diode Du1 and a switch tube Qu1, a control end of the switch tube Qu1 is connected to the controller, a first end of the switch tube Qu1 is connected to an anode of the diode Du1, a second end of the switch tube Qu1 is grounded, a cathode of the diode Du1 is connected to the voltage output circuit, one end of the inductor Lu1 is connected to an anode of the diode Du1, and the other end of the inductor Lu1 is connected to a power supply end.
In one embodiment, the voltage regulation circuit further includes a switch Qu3 and a resistor Rc3, a control terminal of the switch Qu3 is connected to the controller through the resistor Rc3, a first terminal of the switch Qu3 is connected to a power supply terminal, and a second terminal of the switch Qu3 is connected to an anode of the diode Du1 through the inductor Lu 1.
In one embodiment, the buck topology module includes a switch Qu2, a diode Du2 and an inductor Lu2, a control terminal of the switch Qu2 is connected to the controller, a first terminal of the switch Qu2 is connected to a power supply terminal, a second terminal of the switch Qu2 is connected to a cathode of the diode Du2 and one terminal of the inductor Lu2, the other terminal of the inductor Lu2 is connected to a cathode of the diode Du1, and an anode of the diode Du2 is grounded.
In one embodiment, the voltage regulation circuit further includes a resistor R6 and a resistor R7, the resistor R6 and the resistor R7 are connected in series, a common end of the resistor R6 is connected to the cathode of the diode Du1, and the other end of the resistor R7 is grounded.
In one embodiment, the voltage adjustment circuit further includes a capacitor C2, one end of the capacitor C2 is connected to the cathode of the diode Du1, and the other end of the capacitor C2 is grounded.
In one embodiment, the voltage output circuit includes a resistor R1, a switch tube Q1 and a transformer T1, the transformer T1 includes a primary winding, an auxiliary winding and a secondary winding, one end of the primary winding is connected to the voltage regulation circuit, the other end of the primary winding is connected to the first end of the switch tube Q1, one end of the auxiliary winding is connected to the voltage regulation circuit through the resistor R1, the other end of the auxiliary winding is connected to the control end of the switch tube Q1, the secondary winding is connected to the fire detection device, the first end of the switch tube Q1 is connected to the feedback signal processing circuit, and the second end of the switch tube Q1 is grounded.
In one embodiment, the feedback signal processing circuit comprises a diode D1, a capacitor C1, a resistor R4 and a resistor R5, the resistor R4 and the resistor R5 are connected in series, a common end of the resistor R4 is connected with a cathode of the diode D1, the other end of the resistor R5 is grounded, an anode of the diode D1 is connected with the voltage output circuit, one end of the capacitor C1 is connected with a cathode of the diode D1, and the other end of the capacitor C1 is grounded.
Fire detection equipment comprises the self-adaptive fire detection voltage generation circuit.
Above-mentioned self-adaptation is examined thermal voltage and is produced circuit and examine fire equipment detects voltage output circuit's output voltage through feedback signal processing circuit, obtains sampling voltage and sends to the controller, and the controller adjusts voltage adjustment circuit according to sampling voltage and carries the voltage to voltage output circuit to make voltage output circuit's output voltage in predetermineeing the within range, thereby guarantee to provide the stability of examining fire voltage of examining fire device, improved the reliability of use.
Drawings
Fig. 1 is a schematic diagram of a structure of an adaptive fire detection voltage generation circuit in an embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
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 herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It will be understood that spatial relationship terms, such as "under", "below", "beneath", "below", "over", "above", and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements or features described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary terms "under" and "under" can encompass both an orientation of above and below. In addition, the device may also include additional orientations (e.g., rotated 90 degrees or other orientations) and the spatial descriptors used herein interpreted accordingly.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or be connected to the other element through intervening elements. The "connection" in the following embodiments is understood as "electrical connection", "communication connection", or the like if the connected circuits, modules, units, or the like have electrical signals or data transmission therebetween.
As used herein, the singular forms "a", "an" and "the" may include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises/comprising," "includes" or "including," etc., specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof. Also, the terminology used in this specification includes any and all combinations of the associated listed items.
In one embodiment, an adaptive pilot power voltage generation circuit is provided and is suitable for providing a pilot power voltage for flame detection in a gas system. As shown in fig. 1, the adaptive fire-detecting voltage generating circuit 100 includes a voltage adjusting circuit 110, a voltage output circuit 120, a feedback signal processing circuit 130 and a controller, the voltage adjusting circuit 110 is connected to the controller and the voltage output circuit 120, the feedback signal processing circuit 130 is connected to the controller and the voltage output circuit 120, and the voltage output circuit 120 is used for connecting a fire-detecting device. The feedback signal processing circuit 130 is configured to detect an output voltage of the voltage output circuit 120 to obtain a sampling voltage, and send the sampling voltage to the controller, and the controller is configured to adjust a voltage transmitted to the voltage output circuit 120 by the voltage adjusting circuit 110 according to the sampling voltage, so that the output voltage of the voltage output circuit 120 is within a preset range.
The controller may specifically adopt a main control chip. The specific value of the preset range is not unique and can be adjusted according to actual requirements. The voltage regulator circuit 110 processes the external power source, and the processed voltage is transmitted to the voltage output circuit 120, and the voltage output circuit 120 generates the fire detection voltage and outputs the fire detection voltage to the fire detection device. The feedback signal processing circuit 130 performs sampling detection on the output voltage of the voltage output circuit 120, generates a corresponding sampling voltage, and sends the sampling voltage to the main control chip, and the main control chip controls the voltage adjusting circuit 110 to adjust the amplitude of the output voltage according to the sampling voltage, so that the output voltage of the voltage output circuit 120 is within a preset range. For example, when the output voltage of the voltage output circuit 120 exceeds the upper limit of the preset range, the main control chip may control the voltage adjustment circuit 110 to decrease the amplitude of the transmission voltage; when the output voltage of the voltage output circuit 120 is lower than the lower limit of the preset range, the main control chip may control the voltage adjusting circuit 110 to increase the amplitude of the transmission voltage, so as to adjust the output voltage of the voltage output circuit 120.
In one embodiment, the voltage regulation circuit 110 includes a boost topology module 112 and a buck topology module 114, the boost topology module 112 connecting the controller and the voltage output circuit 120, the buck topology module 114 connecting the controller and the voltage output circuit 120. Specifically, when the output voltage of the voltage output circuit 120 is too low, the main control chip sends a PWM (Pulse Width Modulation) signal to the boost topology module 112, and the boost topology module 112 is utilized to increase the amplitude of the voltage transmitted to the voltage output circuit 120; when the output voltage of the voltage output circuit 120 is too high, the main control chip sends a PWM signal to the step-down topology module 114, and the step-down topology module 114 is used to reduce the amplitude of the voltage transmitted to the voltage output circuit 120.
It is understood that in other embodiments, the voltage adjustment circuit 110 may include only the boost topology module 112 or the buck topology module 114. If the voltage adjusting circuit 110 only includes the boost topology module 112, the main control chip utilizes the boost topology module 112 to increase the amplitude of the voltage transmitted to the voltage output circuit 120 when the output voltage of the voltage output circuit 120 is too low. If the voltage adjusting circuit 110 only includes the step-down topology module 114, the main control chip utilizes the step-down topology module 114 to reduce the amplitude of the voltage transmitted to the voltage output circuit 120 when the output voltage of the voltage output circuit 120 is too high.
The adaptive fire detection voltage generating circuit 100 detects the output voltage of the voltage output circuit 120 through the feedback signal processing circuit 130 to obtain a sampling voltage, and sends the sampling voltage to the controller, and the controller adjusts the voltage transmitted to the voltage output circuit 120 by the voltage adjusting circuit 110 according to the sampling voltage to enable the output voltage of the voltage output circuit 120 to be within a preset range, so that the stability of the fire detection voltage provided for the fire detection device is ensured, and the use reliability is improved.
The specific structure of the boost topology module 112 is not exclusive, and in one embodiment, as shown in fig. 1, the boost topology module 112 includes an inductor Lu1, a diode Du1, and a switch Qu1, a control terminal of the switch Qu1 is connected to the controller, a first terminal of the switch Qu1 is connected to an anode of the diode Du1, a second terminal of the switch Qu1 is grounded, a cathode of the diode Du1 is connected to the voltage output circuit 120, one end of the inductor Lu1 is connected to an anode of the diode Du1, and the other end of the inductor Lu1 is connected to a power supply terminal. The inductor Lu1 is specifically an energy storage inductor, and the diode Du1 is specifically a freewheeling diode. The switch Qu1 may be a triode or a MOS transistor, in this embodiment, the switch Qu1 is an NPN-type triode, with a base as a control terminal, a collector as a first terminal, and an emitter as a second terminal.
Further, in an embodiment, the voltage adjustment circuit 110 further includes a switch Qu3 and a resistor Rc3, a control terminal of the switch Qu3 is connected to the controller through the resistor Rc3, a first terminal of the switch Qu3 is connected to a power supply terminal, and a second terminal of the switch Qu3 is connected to an anode of the diode Du1 through an inductor Lu 1. In this embodiment, the switching tube Qu3 may also be a triode or an MOS tube, and the switching tube Qu3 is a PNP-type triode, with a base as a control terminal, an emitter as a first terminal, and a collector as a second terminal.
Likewise, the specific structure of the buck topology module 114 is not exclusive, and in an embodiment, with continued reference to fig. 1, the buck topology module 114 includes a switch Qu2, a diode Du2, and an inductor Lu2, a control terminal of the switch Qu2 is connected to the controller, a first terminal of the switch Qu2 is connected to a power supply terminal, a second terminal of the switch Qu2 is connected to a cathode of the diode Du2 and one terminal of the inductor Lu2, the other terminal of the inductor Lu2 is connected to a cathode of the diode Du1, and an anode of the diode Du2 is grounded. The inductor Lu2 is specifically an energy storage inductor, and the diode Du2 is specifically a freewheeling diode. The switch tube Qu2 may also be a triode or an MOS transistor, in this embodiment, the switch tube Qu2 is a PNP-type triode, with a base as a control terminal, an emitter as a first terminal, and a collector as a second terminal.
In addition, the voltage adjusting circuit 110 may further include a resistor Rc1 and a resistor Rc2, a control terminal of the switching tube Qu1 is connected to the controller through the resistor Rc1, and a control terminal of the switching tube Qu2 is connected to the controller through the resistor Rc 2.
In one embodiment, the voltage adjustment circuit 110 further includes a resistor R6 and a resistor R7, the resistor R6 and the resistor R7 are connected in series, the common terminal is connected to the controller, the other terminal of the resistor R6 is connected to the cathode of the diode Du1, and the other terminal of the resistor R7 is grounded.
Further, in an embodiment, the voltage adjustment circuit 110 further includes a capacitor C2, one end of the capacitor C2 is connected to the cathode of the diode Du1, and the other end of the capacitor C2 is grounded.
Specifically, a PWM1 port of the master control chip is connected with a control end of a switch tube Qu1 through a resistor Rc1, an I/O port of the master control chip is connected with a control end of the switch tube Qu3 through a resistor Rc3, a PWM2 port of the master control chip is connected with a control end of the switch tube Qu2 through a resistor Rc2, an A/D1 port of the master control chip is connected with a common end of a resistor R6 and a resistor R7, and an A/D2 port of the master control chip is connected with the feedback signal processing circuit 130.
The boost topology module 112 is controlled by the I/O port and the PWM1 port of the master chip, and the buck topology module 114 is controlled by the PWM2 port of the master chip. When the voltage needs to be adjusted up, the I/O port is set to an active level (in this embodiment, the active level of the I/O port is a low level, and the inactive level is a high level), the PWM2 port is set to an inactive level (in this embodiment, the inactive level of the PWM2 port is a high level), and then the PWM1 port outputs a PWM signal, that is, a voltage value higher than the power supply voltage can be output, the voltage can be sampled through the resistor R6 and the resistor R7, and the output voltage can be stabilized by adjusting the PWM signal of the PWM1 port according to the sampling result; when the voltage needs to be reduced, the I/O port is set to an inactive level, the PWM1 port is set to an inactive level (in this embodiment, the inactive level of the PWM1 port is set to a low level), then the PWM2 port outputs a PWM signal, that is, a voltage value lower than the power supply voltage can be output, and the output voltage can be stabilized by adjusting the PWM signal at the PWM2 port according to the feedback result of the resistor R6 and the resistor R7.
The specific structure of the voltage output circuit 120 is not exclusive, and in one embodiment, as shown in fig. 1, the voltage output circuit 120 includes a resistor R1, a switching tube Q1, and a transformer T1, and the transformer T1 includes a primary winding N1, an auxiliary winding N2, and a secondary winding N3, wherein the primary winding N1 and the secondary winding N3 are located on opposite sides, and the auxiliary winding N2 is located on the same side as the primary winding N1. One end of the primary winding N1 is connected with the voltage adjusting circuit 110, the other end of the primary winding N1 is connected with the first end of the switch tube Q1, one end of the auxiliary winding N2 is connected with the voltage adjusting circuit 110 through a resistor R1, the other end of the auxiliary winding N2 is connected with the control end of the switch tube Q1, the secondary winding N3 is connected with the fire detection device, the first end of the switch tube Q1 is connected with the feedback signal processing circuit 130, and the second end of the switch tube Q1 is grounded.
Specifically, the primary winding N1 and the resistor R1 are both connected to the cathode of the diode Du1 in the voltage regulator circuit 110. The switching transistor Q1 may also be a triode or a MOS transistor, in this embodiment, the switching transistor Q1 is an NPN-type triode, with a base as a control terminal, a collector as a first terminal, and an emitter as a second terminal. The fire detection device specifically comprises a resistor R2, a resistor R3 and a detection circuit. One end of the secondary winding N3 is connected with the resistor R2, the other end is connected with one end of the resistor R3, the other end of the resistor R3 is connected with the casing of the tested device, and the detection circuit is connected with the two ends of the resistor R3. The voltage output circuit 120 outputs a flame detection voltage, and the detection circuit determines whether there is a flame based on the presence or absence of a voltage across the detection element (i.e., resistor R3). Specifically, the voltage output circuit 120 generates an alternating high voltage signal in the secondary winding N3, and when a flame is present, a current will be generated due to the unidirectional conduction of flame ions, which flow from one end of the secondary winding N3 through the current limiting resistor R2, the flame, the housing, the sensing element back to the other end of the secondary winding N3, and the current will generate a voltage across the sensing element. When no flame exists, the loop is incomplete, no current is generated, and no voltage is generated on the detection element. The presence of a flame can be determined by using a detection circuit to detect the presence of a voltage across the sensing element.
In one embodiment, as shown in fig. 1, the feedback signal processing circuit 130 includes a diode D1, a capacitor C1, a resistor R4, and a resistor R5, wherein the resistor R4 and the resistor R5 are connected in series, and a common end is connected to the controller, the other end of the resistor R4 is connected to a cathode of the diode D1, the other end of the resistor R5 is grounded, an anode of the diode D1 is connected to the voltage output circuit 120, one end of the capacitor C1 is connected to a cathode of the diode D1, and the other end of the capacitor C1 is grounded. The common end of the resistor R4 and the resistor R5 is connected to the A/D2 port of the main control chip, and the anode of the diode D1 is connected to the first end of the switch tube Q1 in the voltage output circuit 120.
Specifically, the output voltage of the secondary winding N3 is in a winding ratio relationship with the output voltage of the primary winding N1. The higher the output voltage of the primary winding N1, the higher the output voltage of the secondary winding N3, that is, the higher the ignition voltage generated by the adaptive ignition voltage generating circuit. The voltage at the first terminal of the switching tube Q1 is equal to the supply voltage minus the output voltage of the primary winding N1. Therefore, the voltage at the first end of the switching tube Q1 reflects the output voltage of the secondary winding N3.
The feedback signal processing circuit 130 receives a feedback signal from the first terminal of the switching transistor Q1, rectifies the alternating voltage at the first terminal of the switching transistor Q1 into a direct current voltage through the diode D1 and the capacitor C1, and the direct current voltage is positively correlated with the magnitude of the feedback signal received at the first terminal of the switching transistor Q1. Then the direct current voltage is divided by a resistor R4 and a resistor R5, the direct current voltage is reduced to a voltage which is sampled by an A/D2 port of a proper main control chip and then is input into the main control chip, and the sampling voltage of the A/D2 port of the main control chip is in proportion to the rectified direct current voltage. Therefore, the voltage sampled at the A/D2 port may reflect the voltage at the first terminal of the switch transistor Q1. Further, the A/D2 port sample voltage may reflect the output voltage of the secondary winding N3.
In one embodiment, there is also provided a fire detection apparatus including the adaptive fire detection voltage generation circuit 100 described above. In addition, the fire detection equipment can also comprise a fire detection device. The fire detection device comprises a resistor R2, a resistor R3 and a detection circuit. One end of the secondary winding N3 is connected with the resistor R2, the other end is connected with one end of the resistor R3, the other end of the resistor R3 is connected with the casing of the tested device, and the detection circuit is connected with the two ends of the resistor R3.
According to the fire detection equipment, the output voltage of the voltage output circuit 120 is detected through the feedback signal processing circuit 130, the obtained sampling voltage is sent to the controller, the controller adjusts the voltage transmitted to the voltage output circuit 120 by the voltage adjusting circuit 110 according to the sampling voltage, so that the output voltage of the voltage output circuit 120 is in a preset range, the stability of the fire detection voltage provided for the fire detection device is ensured, and the use reliability is improved.
In order to better understand the adaptive fire detection voltage generation circuit and the fire detection device, the following detailed description is provided with reference to specific embodiments.
For the heat detecting power voltage generating circuit, if the generated heat detecting power voltage is high, the voltage generated on the detecting element will be large, and the voltage is easier to detect by the detecting circuit. However, because of the discreteness of the characteristics of the components, the conventional fire detection voltage generation circuit is designed by adopting uniform parameters, and the generation of high fire detection voltage is difficult to ensure. In addition, depending on the use environment and the use time, the characteristics of the device itself may change to some extent, and the ignition voltage generated by the ignition voltage generating circuit may decrease. Based on this, this application provides a take feedback to examine thermal voltage generation circuit based on voltage adjustment, can overcome the discreteness of components and parts characteristic in the circuit, and along with the change of different components and parts characteristics of service environment and time.
As shown in fig. 1, in the adaptive fire-detecting voltage generating circuit with feedback based on voltage adjustment, the output of the voltage adjusting circuit 110 is connected to a power supply, a feedback signal is taken from a first end of a switching tube Q1 and is input into the feedback signal processing circuit 130, and then a signal is taken from the feedback signal processing circuit 130 and is input into an a/D2 port of a main control chip for sampling. For convenience of understanding, the following description will be made by taking a transistor as an example of each of the switching tube Qu1, the switching tube Qu2, the switching tube Qu3, and the switching tube Q1.
Specifically, the structure of the voltage adjustment circuit 110 is as follows:
the emitter of the triode Qu3 is connected with a power supply, the collector of the triode Qu3 is connected with one end of an energy storage inductor Lu1, the other end of the energy storage inductor Lu1 is connected with the cathode of a freewheeling diode Du1 and is connected with the collector of the triode Qu1, the cathode of the freewheeling diode Du1 is connected with one end (positive pole) of an output (electrolytic) capacitor C2, the other end (negative pole) of the output (electrolytic) capacitor C2 is connected with a power ground, the emitter of the triode Qu1 is connected with the power ground, the base of the triode Qu3 is connected with one end of a resistor Rc3, and the other end of the Rc3 is connected with an I/O port of a main control chip.
The base of the transistor Qu1 is connected with one end of a resistor Rc1, and the other end of the resistor Rc1 is connected with a PWM port PWM1 of the main control chip. An emitting electrode of the triode Qu2 is connected with a power supply, a collector electrode of the triode Qu2 is connected with one end of an energy storage inductor Lu2 and is connected with a cathode of a fly-wheel diode Du2, the other end of the energy storage inductor Lu2 is connected with one end (positive electrode) of an output (electrolytic) capacitor C2, and an anode of the fly-wheel diode Du2 is connected with the power supply ground. The base of the transistor Qu2 is connected with one end of a resistor Rc2, and the other end of the resistor Rc2 is connected with a PWM port PWM2 of the main control chip. The feedback signal is taken out from one end of an output (electrolytic) capacitor C2 connected with a freewheeling diode Du1, and is connected with one end of a resistor R6, the other end of the resistor R6 is connected with one end of a resistor R7, and the other end of the resistor R7 is connected with the power ground. A signal is taken out from the connection point of the resistor R6 and the resistor R7 and is input to the A/D1 port of the main control chip.
The structure of the voltage output circuit 120 is as follows:
one end of the resistor R1 is connected to the cathode of the diode Du1, the other end is connected to one end of the auxiliary winding N2 of the transformer T1, and the other end of the auxiliary winding N2 is connected to the base of the transistor Q1. One end of a primary winding N1 of the transformer T1 is connected with the cathode of the current diode Du1, the other end is connected with the collector of the triode Q1, and the emitter of the triode Q1 is grounded.
The structure of the feedback signal processing circuit 130 is as follows:
a feedback signal is taken from the collector of the triode Q1 and is connected to the anode of the diode D1, the cathode of the diode D1 is connected with one end (anode) of the (electrolytic) capacitor C1, and the other end (cathode) of the (electrolytic) capacitor C1 is connected with the power ground; one end of a resistor R4 is connected with one end of an (electrolytic) capacitor C1 connected with a diode D1, the other end of the resistor R4 is connected with one end of a resistor R5, and the other end of the resistor R5 is connected with a power ground; a signal is taken out from the connection point of the resistor R4 and the resistor R5 and is input to the A/D2 port of the main control chip.
The voltage adjusting circuit 110 consists of a voltage boosting topology and a voltage reducing topology, the voltage boosting topology is controlled by an I/O port of the main control chip and a PWM (pulse-width modulation) port 1 of the main control chip, and the voltage reducing topology is controlled by a PWM port 2 of the main control chip; when the voltage needs to be adjusted up, the I/O port is set to be at an active level (in this example, the active level of the I/O port is at a low level, and the inactive level is at a high level), the PWM port PWM2 is set to be at an inactive level (in this example, the inactive level of the PWM2 port is at a high level), and then the PWM port PWM1 outputs a PWM signal, namely a voltage value higher than the power supply voltage can be output, the voltage can be sampled through the resistor R6 and the resistor R7, and the output voltage can be stabilized by adjusting the PWM signal of the PWM1 according to the sampling result; when the voltage needs to be reduced, the I/O port is set to be at an invalid level, the PWM1 port is set to be at an invalid level (in the example, the invalid level of the PWM1 port is at a low level), then the PWM2 port outputs a PWM signal, namely, a voltage value lower than the power supply voltage can be output, and the output voltage can be stabilized by adjusting the PWM signal of the PWM2 according to the feedback result.
The feedback signal processing circuit 130 takes a feedback signal from the collector of the triode Q1, rectifies the alternating voltage of the collector of the triode Q1 into a direct current voltage through the diode D1 and the capacitor C1, divides the voltage through the resistor R4 and the resistor R5, reduces the direct current voltage to a voltage suitable for sampling at the a/D2 port of the main control chip, and inputs the voltage into the main control chip.
The fire detection generating circuit generates an alternating high-voltage signal on a secondary winding N3 of the transformer T1, and generates voltage on the detection element if flame exists; if no flame exists, no voltage is generated on the detection element; the detection circuit judges whether flame exists or not by detecting whether voltage exists on the detection element or not.
It is understood that the output voltage of the secondary winding N3 is in winding ratio relation with the output voltage of the primary winding N1, and the higher the output voltage of the primary winding N1 is, the higher the output voltage of the secondary winding N3 is, i.e., the higher the ignition voltage generated by the ignition voltage generating circuit is. The collector voltage of transistor Q1 is equal to the supply voltage minus the output voltage of primary winding N1. In summary, the voltage at the collector of the transistor Q1 reflects the output voltage of the secondary winding N3.
The feedback signal processing circuit takes a feedback signal from the collector of the triode Q1, rectifies the alternating voltage of the collector of the triode Q1 into a direct-current voltage through the diode D1 and the filtering of the capacitor C1, and the direct-current voltage is positively correlated with the magnitude of the feedback signal taken by the collector of the triode Q1. And then, the direct current voltage is reduced to a voltage which is suitable for being sampled by the A/D2 port of the main control chip after being divided by the resistor R4 and the resistor R5, and then the voltage is input into the main control chip, and the sampling voltage of the A/D2 port of the main control chip is in proportion to the rectified direct current voltage. In summary, the sampled voltage at the a/D2 port may reflect the collector voltage of transistor Q1.
From the above, the sampled voltage at the a/D2 port may reflect the output voltage of the secondary winding N3.
The voltage across the primary winding N1 is positively correlated with the voltage at the junction of the secondary winding N1 and the resistor R1, and when the voltage is higher, the output voltage of the primary winding N1 is higher; when this voltage is low, the voltage of the primary winding N1 is low. By controlling the boost topology, a voltage value higher than or equal to the power supply voltage can be output; by controlling the buck topology, a voltage value that is less than or equal to the supply voltage can be output, i.e., the output voltage can be made adjustable up or down the supply voltage using the voltage adjustment circuit 110.
The method comprises the steps of setting an upper limit of the fire detection voltage (the fire detection voltage is too high and is likely to damage devices, and the fire detection voltage is not higher and better in terms of circuit stability), setting a lower limit of the fire detection voltage, sampling the voltage of the feedback signal processing circuit 130 from an A/D2 port in real time, calculating to obtain the corresponding fire detection voltage, and reducing the voltage through controlling a voltage reduction topology if the calculated fire detection voltage is higher than the upper limit, so that the fire detection voltage is reduced. And if the calculated ignition voltage is lower than the lower limit, the voltage is increased by controlling the boost topology, so that the ignition voltage is increased. By using the above strategy, the fire detection voltage output by the circuit can be controlled within a reasonable range.
Above-mentioned take feedback to examine thermal voltage generation circuit based on voltage adjustment, overcome the discreteness of components and parts characteristic in the circuit, guarantee to examine thermal voltage generation circuit and can both produce higher voltage of examining fire. The circuit also overcomes the change of the characteristics of components in the circuit along with the different use environments and time, so that the fire detection voltage generation circuit can always generate higher fire detection voltage.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A self-adaptive fire detection power generation circuit is characterized by comprising a voltage adjusting circuit, a voltage output circuit, a feedback signal processing circuit and a controller, wherein the voltage adjusting circuit is connected with the controller and the voltage output circuit;
the feedback signal processing circuit is used for detecting the output voltage of the voltage output circuit to obtain a sampling voltage and sending the sampling voltage to the controller, and the controller is used for adjusting the voltage transmitted to the voltage output circuit by the voltage adjusting circuit according to the sampling voltage so as to enable the output voltage of the voltage output circuit to be within a preset range.
2. The adaptive thermal power generation circuit of claim 1, wherein the voltage regulation circuit comprises a boost topology module and a buck topology module, the boost topology module connecting the controller and the voltage output circuit, the buck topology module connecting the controller and the voltage output circuit.
3. The adaptive thermal power generation circuit according to claim 2, wherein the boost topology module comprises an inductor Lu1, a diode Du1 and a switch tube Qu1, a control terminal of the switch tube Qu1 is connected to the controller, a first terminal of the switch tube Qu1 is connected to an anode of the diode Du1, a second terminal of the switch tube Qu1 is grounded, a cathode of the diode Du1 is connected to the voltage output circuit, one end of the inductor Lu1 is connected to an anode of the diode Du1, and the other end of the inductor Lu1 is connected to a power supply terminal.
4. The adaptive fire-detecting voltage generation circuit according to claim 3, wherein the voltage regulation circuit further comprises a switch Qu3 and a resistor Rc3, a control terminal of the switch Qu3 is connected to the controller through the resistor Rc3, a first terminal of the switch Qu3 is connected to a power supply terminal, and a second terminal of the switch Qu3 is connected to an anode of the diode Du1 through the inductor Lu 1.
5. The adaptive thermal power generation circuit according to claim 3, wherein the buck topology module comprises a switch tube Qu2, a diode Du2 and an inductor Lu2, a control terminal of the switch tube Qu2 is connected to the controller, a first terminal of the switch tube Qu2 is connected to a power supply terminal, a second terminal of the switch tube Qu2 is connected to a cathode of the diode Du2 and one terminal of the inductor Lu2, the other terminal of the inductor Lu2 is connected to a cathode of the diode Du1, and an anode of the diode Du2 is grounded.
6. The adaptive fire detection voltage generation circuit according to claim 3, wherein the voltage adjustment circuit further comprises a resistor R6 and a resistor R7, the resistor R6 and the resistor R7 are connected in series and a common terminal is connected to the controller, the other terminal of the resistor R6 is connected to the cathode of the diode Du1, and the other terminal of the resistor R7 is connected to ground.
7. The adaptive fire detection voltage generation circuit according to claim 3, wherein the voltage adjustment circuit further comprises a capacitor C2, one end of the capacitor C2 is connected to the cathode of the diode Du1, and the other end of the capacitor C2 is grounded.
8. The adaptive fire detection voltage generation circuit according to claim 1, wherein the voltage output circuit comprises a resistor R1, a switch Q1 and a transformer T1, the transformer T1 comprises a primary winding, an auxiliary winding and a secondary winding, one end of the primary winding is connected to the voltage adjustment circuit, the other end of the primary winding is connected to the first end of the switch Q1, one end of the auxiliary winding is connected to the voltage adjustment circuit through the resistor R1, the other end of the auxiliary winding is connected to the control end of the switch Q1, the secondary winding is connected to the fire detection device, the first end of the switch Q1 is connected to the feedback signal processing circuit, and the second end of the switch Q1 is grounded.
9. The adaptive fire detection voltage generation circuit according to claim 1, wherein the feedback signal processing circuit comprises a diode D1, a capacitor C1, a resistor R4 and a resistor R5, the resistor R4 and the resistor R5 are connected in series, a common end of the resistor R4 and the resistor R3538 is connected to the controller, the other end of the resistor R4 is connected to a cathode of the diode D1, the other end of the resistor R5 is grounded, an anode of the diode D1 is connected to the voltage output circuit, one end of the capacitor C1 is connected to a cathode of the diode D1, and the other end of the capacitor C1 is grounded.
10. A fire detection device comprising an adaptive fire detection voltage generation circuit according to any one of claims 1 to 9.
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| CN202110712262.0A CN113364299A (en) | 2021-06-25 | 2021-06-25 | Self-adaptive fire detection voltage generation circuit and fire detection equipment |
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| CN202110712262.0A CN113364299A (en) | 2021-06-25 | 2021-06-25 | Self-adaptive fire detection voltage generation circuit and fire detection equipment |
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