CN210195920U - Preheating timer - Google Patents
Preheating timer Download PDFInfo
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- CN210195920U CN210195920U CN201920716046.1U CN201920716046U CN210195920U CN 210195920 U CN210195920 U CN 210195920U CN 201920716046 U CN201920716046 U CN 201920716046U CN 210195920 U CN210195920 U CN 210195920U
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Abstract
The application discloses preheat timer, including power module, singlechip, preheating control module, wherein: the input end of the power supply module is connected with direct-current voltage, and when the direct-current voltage is within a preset voltage range, the output end of the power supply module outputs stable voltage; when the direct current voltage exceeds the protection voltage, the output end of the power supply module stops outputting the voltage; the power supply end of the single chip microcomputer is connected with the output end of the power supply module, and a control signal with preset time duration is output to the preheating control module, so that the preheating control module drives the preheating circuit. The timing precision far higher than that of a resistance-capacitance circuit can be realized by outputting a control signal with preset duration through the singlechip; the power supply module carries out power supply protection, can output stable voltage in a preset voltage range and stop outputting the voltage after exceeding the protection voltage, so that the singlechip losing power supply does not output control signals to the preheating control module any more, and the stability and the safety in the aspect of power supply of the whole preheating timer are ensured.
Description
Technical Field
The utility model relates to a device start field, in particular to preheat timer.
Background
The preheating timer is used for heating a preheating plug in a short time before the engine of the vehicle is started so as to raise the ambient temperature to realize normal starting of the engine. The existing preheating timer generally adopts a 555 timing chip, and performs certain time timing treatment through resistance-capacitance charging and discharging after electrification.
However, the application environment of the preheating timer is complex, and the capacitance and resistance in the circuit are easily affected by the environment and the number of times of use, so that the timing precision is deteriorated, and the anti-interference capability of the circuit with simple functionality is weak, and components may be failed in the complex environment, so that the performance of the product is reduced or the preheating timer is damaged.
Therefore, how to provide a solution to the above technical problems is a problem to be solved by those skilled in the art.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model aims at providing a preheat timer stable safety, higher, the timing accuracy of precision. The specific scheme is as follows:
a preheating timer comprises a power module, a single chip microcomputer and a preheating control module, wherein:
the input end of the power supply module is connected with direct-current voltage, and when the direct-current voltage is within a preset voltage range, the output end of the power supply module outputs stable voltage; when the direct current voltage exceeds the protection voltage, the output end of the power supply module stops outputting the voltage;
and the power supply end of the single chip microcomputer is connected with the output end of the power supply module and outputs a control signal with preset time duration to the preheating control module, so that the preheating control module drives the preheating circuit.
Preferably, the power module includes a first diode, a second diode, a first zener diode, a first capacitor, a first triode, a PNP-type second triode, a first resistor, a second resistor, and a third resistor, wherein:
the anode of the first diode is connected with the direct-current voltage, and the cathode of the first diode is connected with the collector of the first triode, the first end of the first resistor and the first end of the second resistor; the second end of the first resistor is connected with the cathode of the second diode and the first end of the third resistor; the second end of the second resistor is connected with the cathode of the first voltage-stabilizing diode and the transmitter of the second triode; the anode of the second diode is connected with the base electrode of the second triode; the base electrode of the first triode is connected with the collector electrode of the second triode, and the emitter electrode of the first triode is connected with the first end of the first capacitor to serve as the output end of the power supply module; and the anode of the first voltage stabilizing diode, the second end of the third resistor and the second end of the first capacitor are grounded.
Preferably, the preheating control module specifically includes:
the first preheating control unit receives a first control signal through a first signal output end of the single chip microcomputer;
and the second preheating control unit receives a second control signal through a second signal output end of the singlechip.
Preferably, the first warm-up control unit includes:
the first end of the fourth resistor is connected with the first signal output end;
a third diode having an anode connected to a second end of the fourth resistor;
the negative electrode of the fourth diode is connected with the output end of the power supply module;
the base electrode of the third triode is connected with the negative electrode of the third diode, the collector electrode of the third triode is connected with the positive electrode of the fourth diode, and the emitter electrode of the third triode is grounded;
the first end of the fifth resistor is connected with the base electrode of the third triode, and the second end of the fifth resistor is grounded;
the two ends of the coil are respectively connected with the two ends of the fourth diode;
the anode of the fifth diode is connected with the first preheating control output end, and the cathode of the fifth diode is connected with the first end of the normally open contact of the relay;
the second preheating control unit includes:
the first end of the sixth resistor is connected with the second signal output end;
a sixth diode having an anode connected to a second end of the sixth resistor;
the base electrode of the fourth triode is connected with the negative electrode of the sixth diode, the collector electrode of the fourth triode is connected with the second end of the normally-open contact, and the emitter electrode of the fourth triode is grounded;
the first end of the seventh resistor is grounded with the base electrode and the second end of the fourth triode;
the anode of the second voltage stabilizing diode is grounded, and the cathode of the second voltage stabilizing diode is connected with the collector of the fourth triode;
and the anode of the seventh diode is connected with the second preheating control output end, and the cathode of the seventh diode is connected with the collector of the fourth triode.
Preferably, the power module further comprises a conversion chip;
the first end of the first capacitor is used as a first voltage output port of the power module and is connected with the input end of the conversion chip, and the output end of the conversion chip is used as a second voltage output port of the power module.
Preferably, a cathode of the fourth diode is connected to the first voltage output port;
and the power supply end of the singlechip is connected with the second voltage output port.
Preferably, the warm-up timer further includes:
the first test end is connected with the negative electrode of the seventh diode, the second test end is connected with the collector electrode of the fourth triode, and the current detection module is used for sending sampling current to the first input end of the single chip microcomputer;
and when the sampling current exceeds a preset current, the singlechip stops outputting the control signal.
Preferably, the warm-up timer further includes:
the power supply end is connected with the output end of the power supply module, and the temperature detection module sends the ambient temperature to the second input end of the single chip microcomputer;
the single chip microcomputer determines the preset time according to the environment temperature;
and when the ambient temperature exceeds a preset temperature, the singlechip stops outputting the control signal.
Preferably, the warm-up timer further includes:
when receiving an electric lock signal, the electric lock signal detection module sends an electric lock detection signal to a third input end of the single chip microcomputer;
and when the electric lock detection signal is received, the singlechip stops outputting the control signal.
Preferably, when the preheating control module includes the first preheating control unit and the second preheating control unit, the electric lock signal detection module specifically includes an eighth diode, a ninth diode, a twelfth diode, a fifth triode, an eighth resistor, a ninth resistor, a tenth resistor, and an eleventh resistor; wherein:
the anode of the eighth diode is used as the input end of the electric lock signal detection module to receive the electric lock signal;
the cathode of the eighth diode is connected with the first end of the ninth resistor and the base of the fifth triode through the eighth resistor;
a second end of the ninth resistor and an emitter of the fifth triode are both grounded;
a first end of the tenth resistor is connected to the output end of the power supply module, and a second end of the tenth resistor is connected to the collector of the fifth triode and the third input end;
the anode of the eighth diode is connected with the anode of the ninth diode and the anode of the twelfth diode through the eleventh resistor;
the negative electrode of the ninth diode is connected with the negative electrode of the third diode;
and the cathode of the twelfth pole tube is connected with the cathode of the sixth diode.
The application discloses preheat timer, including power module, singlechip, preheating control module, wherein: the input end of the power supply module is connected with direct-current voltage, and when the direct-current voltage is within a preset voltage range, the output end of the power supply module outputs stable voltage; when the direct current voltage exceeds the protection voltage, the output end of the power supply module stops outputting the voltage; and the power supply end of the single chip microcomputer is connected with the output end of the power supply module and outputs a control signal with preset time duration to the preheating control module, so that the preheating control module drives the preheating circuit. The timing precision far higher than that of a resistance-capacitance circuit can be realized by outputting a control signal with preset duration through the singlechip; the power supply module carries out power supply protection, can output stable voltage in a preset voltage range and stop outputting the voltage after exceeding the protection voltage, so that the singlechip losing power supply does not output control signals to the preheating control module any more, and the stability and the safety in the aspect of power supply of the whole preheating timer are ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a structural distribution diagram of a preheating timer according to an embodiment of the present invention;
fig. 2 is a structural distribution diagram of a specific preheating timer according to an embodiment of the present invention;
fig. 3 is a structural distribution diagram of a specific preheating timer according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The embodiment of the utility model discloses preheat timer, it is shown to refer to fig. 1, including power module 1, singlechip 2 preheats control module 3, wherein:
the input end of the power supply module 1 is connected with a Direct Current (DC) voltage, and when the DC voltage is within a preset voltage range, the output end of the power supply module 1 outputs a stable voltage; when the direct current voltage DC exceeds the protection voltage, the output end of the power supply module 1 stops outputting the voltage;
the power supply end of the single chip microcomputer 2 is connected with the output end of the power supply module 1, and outputs a control signal with preset duration to the preheating control module 3, so that the preheating control module 3 drives the preheating circuit 4.
It can be understood that, based on a specific circuit design, the power module 1 can output a stable voltage as long as the DC voltage DC is within a certain voltage range, and therefore, the preheat timer in this embodiment has the characteristic of supplying a wide voltage of the power supply, a preset voltage range of the DC voltage DC is usually selected to be 8-36V, the stable voltage output by the power module 1 is maintained at a constant value, that is, the power supply voltage required by the single chip microcomputer 2 is usually selected to be 5V, and the protection voltage is equal to or slightly higher than the highest value of the preset voltage range, and the value thereof can be determined to be 40V. When the protection voltage is exceeded, the power supply module 1 stops supplying power, and the preheating timer is prevented from being damaged by overhigh voltage.
Further, when the power supply end of the single chip microcomputer 2 is connected with the voltage, the single chip microcomputer outputs a control signal to the preheating control module 3 through internal program control, the acting time of the preheating circuit 4 driven by the preheating control module 3 is the preset time of the control signal, that is to say, the single chip microcomputer 2 realizes the timing function of the preheating timer through the fact that the length of the accurate control signal is the preset time. Since the control precision of the single chip microcomputer 2 to time is obviously higher than that of a resistance-capacitance circuit in the prior art, the embodiment can realize more accurate preheating timing than that in the prior art.
Further, the preheating circuit 4 specifically includes a preheating plug for heating the actual environment; the preheating control module 3 is a control circuit of the preheating circuit, and includes a resistance-capacitance circuit, a switching tube, etc. when the preheating control module 3 receives a control signal, the internal circuit path of the circuit is changed to operate the preheating circuit 4.
The application discloses preheat timer, including power module, singlechip, preheating control module, wherein: the input end of the power supply module is connected with direct-current voltage, and when the direct-current voltage is within a preset voltage range, the output end of the power supply module outputs stable voltage; when the direct current voltage exceeds the protection voltage, the output end of the power supply module stops outputting the voltage; and the power supply end of the single chip microcomputer is connected with the output end of the power supply module and outputs a control signal with preset time duration to the preheating control module, so that the preheating control module drives the preheating circuit. The timing precision far higher than that of a resistance-capacitance circuit can be realized by outputting a control signal with preset duration through the singlechip; the power supply module carries out power supply protection, can output stable voltage in a preset voltage range and stop outputting the voltage after exceeding the protection voltage, so that the singlechip losing power supply does not output control signals to the preheating control module any more, and the stability and the safety in the aspect of power supply of the whole preheating timer are ensured.
The embodiment of the utility model discloses specific preheat timer, for last embodiment, further explanation and optimization have been made to technical scheme to this embodiment. See in particular fig. 2:
the power module 1 includes a first diode D1, a second diode D2, a first zener diode Z1, a first capacitor C1, a first triode Q1, a PNP-type second triode Q2, a first resistor R1, a second resistor R2, and a third resistor R3, where:
the anode of the first diode D1 is connected with the direct-current voltage DC, and the cathode thereof is connected with the collector of the first triode Q1, the first end of the first resistor R1 and the first end of the second resistor R2; a second end of the first resistor R1 is connected with a cathode of the second diode D2 and a first end of the third resistor R3; a second end of the second resistor R2 is connected with the cathode of the first voltage-stabilizing diode Z1 and the transmitter of the second triode Q2; the anode of the second diode D2 is connected with the base of the second triode Q2; the base electrode of the first triode Q1 is connected with the collector electrode of the second triode Q2, and the emitter electrode of the first triode Q1 is connected with the first end of the first capacitor C1 to serve as the output end of the power module 1; the anode of the first zener diode Z1, the second end of the third resistor R3, and the second end of the first capacitor C1 are all grounded.
It can be understood that the PNP transistor and the NPN transistor have different current characteristics, in this embodiment, the second transistor Q2 must be of the PNP type, and the remaining transistors are generally of the NPN type, so that the following effects can be achieved: through the cooperation of the first resistor R1, the second resistor R2, the third resistor R3, the second diode D2, the first voltage-stabilizing diode Z1 and the second triode Q2, when the direct-current power supply DC is within a preset voltage range, the second triode Q2 is conducted, then the first triode Q1 is conducted, and due to the effects of the first voltage-stabilizing diode Z1 and the first capacitor C1, the transmitter of the first triode Q1 outputs a stable voltage with a constant value; when the direct-current power supply DC exceeds the protection voltage, the first resistor R1, the second resistor R2, the third resistor R3, the second diode D2 and the first voltage-stabilizing diode Z1 control the second triode Q2 to be cut off, and further the first triode Q1 is cut off, at the moment, the power supply module 1 cuts off the power supply path of the direct-current power supply DC to other modules of the preheating timer, and other modules are protected from overvoltage.
Further, the power module 1 may further include a converting chip U1, wherein a first end of the first capacitor C1 is connected to the input terminal Vin of the converting chip U1 as a first voltage output port V1 of the power module 1, and an output terminal Vout of the converting chip U1 is connected to the second voltage output port V2 of the power module 1.
It will be appreciated that the power module 1 can now provide two levels of voltages V1 and V2 to power the different required modules within the preheat timer.
Specifically, a specific pin in the conversion chip U1 needs to be grounded, and a voltage stabilizing capacitor may be added between the second output port V2 and the ground terminal to ensure that the output voltage of the second voltage output port V2 is stable.
Further, the preheating control module 3 specifically includes:
the first preheating control unit 31 receiving the first control signal through the first signal output terminal out1 of the single chip microcomputer 2;
and a second preheating control unit 32 receiving the second control signal through a second signal output terminal out2 of the single chip microcomputer 2.
It can be understood that, the two preheating control units of the first preheating control unit 31 and the second preheating control unit 32 can be independently controlled by the first control signal and the second control signal respectively, and at this time, when any one preheating control unit has a problem, the other preheating control unit does not affect the function of the preheating circuit; the circuits of the preheating control units can have relevance, and once one preheating control unit fails, the other preheating control unit stops working at the same time.
Specifically, the first warm-up control unit 31 may include:
a fourth resistor C4 having a first terminal connected to the first signal output terminal out 1;
a third diode D3 having an anode connected to a second terminal of the fourth resistor C4;
a fourth diode D2 having a cathode connected to the output terminal of the power module 1;
a third triode Q3 with a base connected with the cathode of the third diode D3, a collector connected with the anode of the fourth diode D2 and an emitter grounded;
a fifth resistor R5, the first end of which is connected with the base of the third triode Q3 and the second end of which is grounded;
a relay K with two ends of the coil respectively connected with two ends of a fourth diode D4;
the anode of the fifth diode D5 is connected with the first preheating control output end, and the cathode of the fifth diode D5 is connected with the first end of the normally open contact of the relay K;
specifically, the second warm-up control unit 32 may include:
a sixth resistor R6 having a first end connected to the second signal output terminal out 2;
a sixth diode D6 having an anode connected to the second end of the sixth resistor R6;
the base electrode of the fourth triode Q4 is connected with the negative electrode of the sixth diode D6, the collector electrode of the fourth triode Q4 is connected with the second end of the normally open contact of the relay K, and the emitter electrode of the fourth triode Q4 is grounded;
a seventh resistor R7, the first end of which is grounded with the base of the fourth triode Q4 and the second end of which is grounded;
a second voltage-stabilizing diode Z2 with the anode grounded and the cathode connected with the collector of the fourth triode Q4;
and the anode of the seventh diode D7 is connected with the second preheating control output end, and the cathode of the seventh diode D7 is connected with the collector of the fourth triode Q4.
Further, the cathode of the fourth diode D4 is connected to the first voltage output port V1; and the power supply end of the singlechip 2 is connected with a second voltage output port V2.
It can be understood that the power module 1 in the present embodiment is known to be capable of providing two levels of stable voltages, so if the voltage required by the relay K is different from the power supply voltage of the single chip microcomputer 2, the two levels of stable voltages can be obtained through the conversion chip U1. In this embodiment, the power supply voltage of the single chip 2 is 5V, which is provided by the output terminal Vout of the conversion chip U1, i.e., the second voltage output port V2, and the voltage required by the relay K is 12V, which is provided by the first voltage output port V1. Besides the voltage setting in this embodiment, the specific power supply voltage required by the single chip microcomputer 2 and the relay K may also be other voltage values, the power supply voltage of the single chip microcomputer 2 may also be provided by the first voltage output port V1, and the voltage required by the relay K is correspondingly provided by the second voltage output port V2.
When the single chip microcomputer 2 outputs a high-level first control signal to the first preheating control unit 31, the third triode Q3 is conducted by utilizing the cooperation of the fourth resistor R4 and the fifth resistor R5, the coil of the relay K is electrified, so that the normally open contact is closed, meanwhile, the second preheating control unit 32 receives a high-level second control signal, similarly, the fourth triode Q4 is conducted by the cooperation of the sixth resistor R6 and the seventh resistor R7, at this time, the first preheating control output end generates a driving current of a corresponding preheating circuit between the normally open contact of the relay K and the fourth triode Q4 and the ground end, and the second preheating control output end generates a driving current of a corresponding preheating circuit between the fourth triode Q4 and the ground end.
If the single chip microcomputer 2 stops outputting the first control signal and the second control signal, the third triode Q3 and the fourth triode Q4 are both cut off, the normally open contact of the relay K is disconnected, no driving current is generated, and the preheating circuit stops working.
It is obvious that there is a relationship between the first preheat control unit 31 and the second preheat control unit 32 in this embodiment, and once the second preheat control unit 32 fails, the fourth transistor Q4 is normally short-circuited, and the driving current of the first preheat control unit 31 also disappears.
It is understood that the specific circuit of the first preheating control unit 31 may also refer to the second preheating control unit 32, the specific circuit of the second preheating control unit 32 may also refer to the first preheating control unit 31, and the specific circuits of the two preheating control units may also be other circuits besides the present embodiment, which is not limited herein.
Further, the preheat timer may further include:
the current detection module 5 is connected with the negative electrode of the seventh diode D7 at the first test end, is connected with the collector of the fourth triode Q4 at the second test end, and sends sampling current to the first input end in1 of the singlechip 2;
when the sampling current exceeds the preset current, the singlechip 2 stops outputting the control signal.
Wherein the control signal here includes a first control signal and a second control signal.
It can be understood that, in the present embodiment, the current detection module 5 and the single chip microcomputer 2 are used to add the overcurrent protection to the preheating timer, and when the sampling current of the preheating control module 3 exceeds the preset current, the single chip microcomputer 2 is used to stop the driving of the preheating control module 3 to the preheating circuit 4, so as to protect the circuit inside the preheating timer from being affected by the large current.
Specifically, the current detection module 5 is generally implemented by a resistance-capacitance circuit, and the specific circuit connection relationship may refer to fig. 2, or other circuit modules capable of implementing the current sampling function may be selected.
The embodiment of the utility model discloses specific preheat timer, for last embodiment, further explanation and optimization have been made to technical scheme to this embodiment. Referring specifically to fig. 3, the preheat timer further includes:
the power supply end is connected with the output end of the power supply module 1, and the temperature detection module 6 is used for sending the ambient temperature to a second input end in2 of the singlechip 2;
the singlechip 2 determines preset time according to the ambient temperature;
when the ambient temperature exceeds the preset temperature, the single chip microcomputer 2 stops outputting the control signal.
The specific circuit of the temperature detection module 6 may refer to the prior art, and is not described herein again.
It is understood that the preset temperature is actually the warning temperature of the preheat timer, and is generally selected to be 100 ℃ to protect the preheat timer and the external device circuit.
It can be understood that the preset time duration is set by the single chip microcomputer 2, and can also be a numerical value correspondingly determined according to the environment temperature, and considering that the higher the environment temperature is, the smaller the preheating temperature difference required by the engine is, and the shorter the operation time duration of the preheating circuit 4 is, the single chip microcomputer 2 determines the preset time duration according to the environment temperature, so that the preheating circuit 4 can operate to the environment temperature to be the effective temperature, the time and energy consumption of preheating are saved, the efficiency of the engine starting process is improved, and meanwhile, the phenomenon that the preheating timer and external equipment are damaged due to the overlong heating time of the preheating circuit 4 is avoided. Usually, the preset time range of the single chip microcomputer 2 is between 0 and 12 seconds, the corresponding relation between the environment temperature and the preset time should be stored in the single chip microcomputer 2, the corresponding relation is generally represented by various forms such as a relation corresponding table and a relation function, and the specific form and numerical parameter are determined by field tests, the parameters of the preheating circuit 4, the precision of the temperature detection module 6, the precision range of the preset time and the like.
Further, the preheating timer further comprises:
when receiving the electric lock signal, the electric lock signal detection module 7 sends an electric lock detection signal to a third input end in3 of the single chip microcomputer 2;
when receiving the electric lock detection signal, the single chip microcomputer 2 stops outputting the control signal.
It can be understood that, when the external device sends the electric lock signal to the electric lock signal detection module 7, except stopping the single chip microcomputer 2 from outputting the control signal, the preheating control module 3 can be directly controlled by the electric lock signal detection module 7, and actually the occurrence of the electric lock signal takes the control of the single chip microcomputer 2 on the preheating control module 3, that is, in the midway of the single chip microcomputer 2 outputting the control signal according to the preset duration, if the third input terminal in3 receives the electric lock detection signal, the output of the control signal is immediately stopped, and the electric lock signal detection module 7 controls the preheating control module 3 until the external device stops sending the electric lock signal to the electric lock signal detection module 7.
Specifically, when the preheating control module 3 includes the first preheating control unit 31 and the second preheating control unit 32, the electric lock signal detection module 7 specifically includes an eighth diode D8, a ninth diode D9, a twelfth diode D10, a fifth triode Q5, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, and an eleventh resistor R11; wherein:
the anode of the eighth diode D8 is used as the input end of the electric lock signal detection module 7 to receive the electric lock signal;
the cathode of the eighth diode D8 is connected to the first end of the ninth resistor R9 and the base of the fifth transistor Q5 through an eighth resistor R8;
the second end of the ninth resistor R9 and the emitter of the fifth triode Q5 are both grounded;
a first end of the tenth resistor R10 is connected to the output end of the power module 1, and a second end of the tenth resistor R10 is connected to the collector of the fifth triode Q5 and the third input end in 3;
the anode of the eighth diode D8 is connected to the anode of the ninth diode D9 and the anode of the twelfth diode D10 through an eleventh resistor R11;
the cathode of the ninth diode D9 is connected to the cathode of the third diode Q3;
the cathode of the twelfth diode D10 is connected to the cathode of the sixth diode D6.
It can be understood that, the specific circuit of the electric lock signal detection module 7 can achieve the effect of capturing the control right of the single chip microcomputer 2 to the preheating control module 3.
The output end of the power module connected to the tenth resistor R10 is determined by the voltage required by the internal circuit of the electric lock signal detection module 7, and is generally the same as the power supply voltage of the single chip microcomputer 2, and the voltage output port same as the voltage output port of the single chip microcomputer 2 is selected.
It can be understood that, the above-mentioned embodiment has realized various kinds of protection to preheating timer through various kinds of modules, for example, carry out overvoltage protection through power module 1, carry out overcurrent protection through current detection module 5 and singlechip 2, carry out temperature protection through temperature detection module 6, directly stop preheating control module 3 to preheating circuit 4's drive through electric lock signal detection module 7, specifically can divide into and stop outputting two kinds of thinking of preheating control module 3, direct control preheating control module 3 through controlling singlechip 2 to the control signal of high level.
Because the stable comprehensive protection characteristic of preheating timer in this embodiment can adapt to complicated operational environment, can the wide application in functional vehicles such as fork truck. In actual operation, according to the complexity of working conditions, related matching elements are added to realize the selective combination of the modules, and the safety and stability of the preheating timer and external equipment are ensured.
Besides the protection, other protection circuits can be supplemented to realize related protection, and the specific protection module can refer to the prior art.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, scheme, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, scheme, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, scheme, article or apparatus that comprises the element.
The preheating timer provided by the present invention is described in detail above, and the principle and the implementation of the present invention are explained by applying a specific example, and the description of the above example is only used to help understanding the scheme and the core idea of the present invention; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the specific implementation and application scope, to sum up, the content of the present specification should not be understood as the limitation of the present invention.
Claims (10)
1. The utility model provides a preheat timer which characterized in that, includes power module, singlechip, preheating control module, wherein:
the input end of the power supply module is connected with direct-current voltage, and when the direct-current voltage is within a preset voltage range, the output end of the power supply module outputs stable voltage; when the direct current voltage exceeds the preset voltage range, the output end of the power supply module stops outputting voltage;
and the power supply end of the single chip microcomputer is connected with the output end of the power supply module and outputs a control signal with preset time duration to the preheating control module, so that the preheating control module drives the preheating circuit.
2. The preheat timer of claim 1, wherein the power module comprises a first diode, a second diode, a first zener diode, a first capacitor, a first transistor, a second transistor of PNP type, a first resistor, a second resistor, and a third resistor, wherein:
the anode of the first diode is connected with the direct-current voltage, and the cathode of the first diode is connected with the collector of the first triode, the first end of the first resistor and the first end of the second resistor; the second end of the first resistor is connected with the cathode of the second diode and the first end of the third resistor; the second end of the second resistor is connected with the cathode of the first voltage-stabilizing diode and the transmitter of the second triode; the anode of the second diode is connected with the base electrode of the second triode; the base electrode of the first triode is connected with the collector electrode of the second triode, and the emitter electrode of the first triode is connected with the first end of the first capacitor to serve as the output end of the power supply module; and the anode of the first voltage stabilizing diode, the second end of the third resistor and the second end of the first capacitor are grounded.
3. The preheat timer of claim 2, wherein the preheat control module particularly comprises:
the first preheating control unit receives a first control signal through a first signal output end of the single chip microcomputer;
and the second preheating control unit receives a second control signal through a second signal output end of the singlechip.
4. The preheat timer of claim 3, wherein the first preheat control unit comprises:
the first end of the fourth resistor is connected with the first signal output end;
a third diode having an anode connected to a second end of the fourth resistor;
the negative electrode of the fourth diode is connected with the output end of the power supply module;
the base electrode of the third triode is connected with the negative electrode of the third diode, the collector electrode of the third triode is connected with the positive electrode of the fourth diode, and the emitter electrode of the third triode is grounded;
the first end of the fifth resistor is connected with the base electrode of the third triode, and the second end of the fifth resistor is grounded;
the two ends of the coil are respectively connected with the two ends of the fourth diode;
the anode of the fifth diode is connected with the first preheating control output end, and the cathode of the fifth diode is connected with the first end of the normally open contact of the relay;
the second preheating control unit includes:
the first end of the sixth resistor is connected with the second signal output end;
a sixth diode having an anode connected to a second end of the sixth resistor;
the base electrode of the fourth triode is connected with the negative electrode of the sixth diode, the collector electrode of the fourth triode is connected with the second end of the normally-open contact, and the emitter electrode of the fourth triode is grounded;
the first end of the seventh resistor is grounded with the base electrode and the second end of the fourth triode;
the anode of the second voltage stabilizing diode is grounded, and the cathode of the second voltage stabilizing diode is connected with the collector of the fourth triode;
and the anode of the seventh diode is connected with the second preheating control output end, and the cathode of the seventh diode is connected with the collector of the fourth triode.
5. The preheat timer of claim 4, wherein the power module further comprises a conversion chip;
the first end of the first capacitor is used as a first voltage output port of the power module and is connected with the input end of the conversion chip, and the output end of the conversion chip is used as a second voltage output port of the power module.
6. The preheat timer of claim 5,
the cathode of the fourth diode is connected with the first voltage output port;
and the power supply end of the singlechip is connected with the second voltage output port.
7. The preheat timer of claim 4, further comprising:
the first test end is connected with the negative electrode of the seventh diode, the second test end is connected with the collector electrode of the fourth triode, and the current detection module is used for sending sampling current to the first input end of the single chip microcomputer;
and when the sampling current exceeds a preset current, the singlechip stops outputting the control signal.
8. The preheat timer according to any one of claims 1 to 7, further comprising:
the power supply end is connected with the output end of the power supply module, and the temperature detection module sends the ambient temperature to the second input end of the single chip microcomputer;
the single chip microcomputer determines the preset time according to the environment temperature;
and when the ambient temperature exceeds a preset temperature, the singlechip stops outputting the control signal.
9. The preheat timer of claim 8, further comprising:
when receiving an electric lock signal, the electric lock signal detection module sends an electric lock detection signal to a third input end of the single chip microcomputer;
and when the electric lock detection signal is received, the singlechip stops outputting the control signal.
10. The preheat timer of claim 4, further comprising:
when receiving an electric lock signal, the electric lock signal detection module sends an electric lock detection signal to a third input end of the single chip microcomputer;
the electric lock signal detection module specifically comprises an eighth diode, a ninth diode, a twelfth diode, a fifth triode, an eighth resistor, a ninth resistor, a tenth resistor and an eleventh resistor; wherein:
the anode of the eighth diode is used as the input end of the electric lock signal detection module to receive the electric lock signal;
the cathode of the eighth diode is connected with the first end of the ninth resistor and the base of the fifth triode through the eighth resistor;
a second end of the ninth resistor and an emitter of the fifth triode are both grounded;
a first end of the tenth resistor is connected to the output end of the power supply module, and a second end of the tenth resistor is connected to the collector of the fifth triode and the third input end;
the anode of the eighth diode is connected with the anode of the ninth diode and the anode of the twelfth diode through the eleventh resistor;
the negative electrode of the ninth diode is connected with the negative electrode of the third diode;
and the cathode of the twelfth pole tube is connected with the cathode of the sixth diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920716046.1U CN210195920U (en) | 2019-05-17 | 2019-05-17 | Preheating timer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920716046.1U CN210195920U (en) | 2019-05-17 | 2019-05-17 | Preheating timer |
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| CN210195920U true CN210195920U (en) | 2020-03-27 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110017233A (en) * | 2019-05-17 | 2019-07-16 | 杭叉集团股份有限公司 | A kind of preheating timer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110017233A (en) * | 2019-05-17 | 2019-07-16 | 杭叉集团股份有限公司 | A kind of preheating timer |
| CN110017233B (en) * | 2019-05-17 | 2024-02-27 | 杭叉集团股份有限公司 | Preheating timer |
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