CN209330421U - A kind of low temperature liquid crystal heating control circuit with burn-out-proof protection - Google Patents

A kind of low temperature liquid crystal heating control circuit with burn-out-proof protection Download PDF

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Publication number
CN209330421U
CN209330421U CN201821545153.4U CN201821545153U CN209330421U CN 209330421 U CN209330421 U CN 209330421U CN 201821545153 U CN201821545153 U CN 201821545153U CN 209330421 U CN209330421 U CN 209330421U
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heating
liquid crystal
low temperature
chip microcontroller
temperature liquid
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朱伟燕
王磊
王海川
王洪杰
徐铁山
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Zhengzhou Smartgen Technology Co Ltd
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Zhengzhou Smartgen Technology Co Ltd
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Abstract

The utility model provides a kind of low temperature liquid crystal heating control circuit with burn-out-proof protection, is applied to diesel engine generator set controller, comprising: single-chip microcontroller, control heating module, connector J1 and burn-out-proof protective module;The burn-out-proof protective module is connected to the delivery outlet of the single-chip microcontroller;The input terminal of the connector J1 is connected to the end battery supply B+ by the normal open switch of the relay K1, and the output end of the connector J1 connects the output end of the control heating module by the heating sheet of low temperature liquid crystal;The control heating module is connected to the pwm pulse delivery outlet of the single-chip microcontroller;When low temperature liquid crystal temperature is lower than -7 DEG C, the single-chip microcontroller exports pwm pulse to computer heating control command input LCD_Heating_CTR_O;When low temperature liquid crystal temperature is heated up to be greater than 0 DEG C, the single-chip microcontroller exports low level;When low temperature liquid crystal temperature is higher than 45 DEG C, the single-chip microcontroller exports low level to the heating out code input terminal LCD_Heating_OFF.

Description

A kind of low temperature liquid crystal heating control circuit with burn-out-proof protection
Technical field
The utility model relates to low temperature liquid crystal heating arts, specifically, relate to a kind of low temperature with burn-out-proof protection Liquid crystal heating control circuit.
Background technique
With the development of society, the application of diesel generating set and range are more and more extensive, in cold low-temperature region It is middle also to become normality using diesel generating set.And the use environment of common controller of diesel generator set low temperature liquid crystal is only It is -25 DEG C~+70 DEG C, therefore designs a kind of low temperature liquid crystal that can operate at -40 DEG C~+70 DEG C and become and be necessarily required to, still, When designing heating control circuit, it is also necessary to consider the problems of such as burn-out-proof protection.
In order to solve the above problems, people are seeking always a kind of ideal technical solution.
Utility model content
The purpose of this utility model is in view of the deficiencies of the prior art, to provide a kind of design science, practical, knot Structure is simple, the low temperature liquid crystal heating control circuit easy to use with burn-out-proof protection.
To achieve the goals above, the technical scheme adopted by the utility model is a kind of low temperature with burn-out-proof protection Liquid crystal heating control circuit, be applied to diesel engine generator set controller, comprising: single-chip microcontroller, control heating module, connector J1 and Burn-out-proof protective module;
The burn-out-proof protective module includes relay K1, diode D1, resistance R1 and triode Q1;The triode Q1's Collector is connected to power supply end by the coil of the relay K1, and the diode D1 is connected in parallel on the line of the relay K1 The base stage at the both ends of circle, the emitter ground connection of the triode Q1, the triode Q1 is closed by the resistance R1 as heating Close the delivery outlet that command input LCD_Heating_OFF is connected to the single-chip microcontroller;
The input terminal of the connector J1 is connected to the end battery supply B+ by the normal open switch of the relay K1, described The output end of connector J1 connects the output end of the control heating module by the heating sheet of low temperature liquid crystal;
The control heating module includes resistance R2 and triode Q2;The base stage of the triode Q2 passes through the resistance R2 It is connected to the pwm pulse delivery outlet of the single-chip microcontroller as computer heating control command input LCD_Heating_CTR_O, described three The emitter of pole pipe Q2 is grounded, and the collector of the triode Q1 connects the company as the output end of the control heating module Connect the output end of device J1;
The single-chip microcontroller is connected with the temperature detecting module for detecting low temperature liquid crystal temperature;
When low temperature liquid crystal temperature is lower than -7 DEG C, the single-chip microcontroller exports pwm pulse to computer heating control command input LCD_Heating_CTR_O;When low temperature liquid crystal temperature is heated up to be greater than 0 DEG C, the single-chip microcontroller exports low level;
When low temperature liquid crystal temperature is higher than 45 DEG C, the single-chip microcontroller is to the heating out code input terminal LCD_ Heating_OFF exports low level.
Based on above-mentioned, the single-chip microcontroller model STM32F103ZET6.
The utility model has substantive features and progress compared with the prior art, and the utility model is by relay K1, two poles Pipe D1, resistance R1 and triode Q1 composition burn-out-proof protect circuit, by resistance R2 and triode Q2 composition control heater circuit, low In warm environment, after normal connection power supply, is controlled by single-chip microcontroller, low temperature liquid crystal is heated, make low temperature liquid crystal in low-temperature condition It can work normally, circuit structure is simple, safe and reliable, and with design science, practical, structure is simple, easy to use Advantage.
Detailed description of the invention
Fig. 1 is the circuit theory schematic diagram of the utility model.
Specific embodiment
Below by specific embodiment, the technical solution of the utility model is described in further detail.
As shown in Figure 1, a kind of low temperature liquid crystal heating control circuit with burn-out-proof protection, is applied to the control of diesel engine unit Device processed, comprising: single-chip microcontroller STM32F103ZET6, control heating module, connector and burn-out-proof protective module;
The burn-out-proof protective module includes relay K1, diode D1, resistance R1 and triode Q1;The triode Q1's Collector is connected to power supply end by the coil of the relay K1, and the diode D1 is connected in parallel on the line of the relay K1 The base stage at the both ends of circle, the emitter ground connection of the triode Q1, the triode Q1 is closed by the resistance R1 as heating Close the delivery outlet that command input LCD_Heating_OFF is connected to the single-chip microcontroller;
The input terminal of the connector J1 is connected to the end battery supply B+ by the normal open switch of the relay K1, described The output end of connector J1 connects the output end of the control heating module by the heating sheet of low temperature liquid crystal;
The control heating module includes resistance R2 and triode Q2;The base stage of the triode Q2 passes through the resistance R2 It is connected to the pwm pulse delivery outlet of the single-chip microcontroller as computer heating control command input LCD_Heating_CTR_O, described three The emitter of pole pipe Q2 is grounded, and the collector of the triode Q1 connects the company as the output end of the control heating module Connect the output end of device J1.
The course of work of the utility model is as follows:
Power supply is battery supply B+ power supply.Connector J1 is connected to the heating sheet of low temperature liquid crystal.
The positive B+ of 1 foot (common end) the connection cell voltage of relay K1,3 feet (normally opened output end) of relay K1 are even 1 foot of connecting connector J1, vacantly, 4 feet of relay K1 connect power supply+5.0V and two to 2 feet (normally closed output end) of relay K1 2 feet of pole pipe D1,1 foot of the 5 feet connection diode D1 of relay K1 and 1 foot (collector) of triode Q1,2 feet of resistance R1 As computer heating control command input LCD_Heating_CTR_O, 2 feet (base stage) of the 1 foot connecting triode Q1 of resistance R1, three 3 feet (emitter) of pole pipe Q1 are grounded.The output of computer heating control command input LCD_Heating_CTR_O connection single-chip microcontroller Mouthful.
Single-chip microcontroller acquires low temperature liquid crystal temperature in real time.When power supply power supply is normal, single-chip microcontroller export high level to heat close 2 feet (base stage) of command input LCD_Heating_OFF, triode Q1 are high level, and triode Q1 is connected, at this time relay 5 feet of K1 are low level, and 4 feet of relay K1 meet+5.0V, and 4 feet and 5 feet of relay K1 have electric current to pass through, the 1 of relay K1 Foot (common end) can be attracted immediately to 3 feet (normally opened output end), the 1 foot connection of battery supply B+ and connector J1.Work as Low Temperature Liquid When brilliant temperature is greater than 45 DEG C, single-chip microcontroller exports low level to heating out code input terminal LCD_Heating_OFF, triode Q1 2 feet (base stage) be low level, triode Q1 cut-off, 4 feet of relay K1 and 5 foot no currents pass through, 1 foot of relay K1 (common end) can be pull-in on 2 feet (normally closed output end), and relay K1 is failure to actuate, and battery B+ is not turned on connector J1, entirely Heater circuit disconnects.
When the triode Q2 for controlling heater circuit is burnt out, triode Q2 can not control computer heating control instruction by single-chip microcontroller Input terminal LCD_Heating_CTR_O is turned off, and at this moment can also be continued to low temperature liquid crystal continuous heating, the temperature of low temperature liquid crystal Rise, when the temperature that single-chip microcontroller collects low temperature liquid crystal is greater than 45 DEG C, is closed and referred to heating by single-chip microcontroller output low level Input terminal LCD_Heating_OFF is enabled to turn off relay K1, turns off entire heater circuit, to realize the function of burn-out-proof protection Energy.
The effect of diode D1 is: relay coil shutdown transient, its both ends can generate very big voltage, it is likely that damage Bad coil, the component being connected also can be breakdown.But diode D1 is connected at relay coil both ends, it can be so that it be produced A raw circuit (be equivalent to when power-off and connect root shorting stub at coil both ends), the energy for storing coil are released, i.e. two poles Pipe plays the role of afterflow.
For the heating progress of real-time control low temperature liquid crystal, while too fast damage low temperature liquid crystal is heated in order to prevent.It is described Computer heating control command input LCD_Heating_CTR_O connects the pwm pulse delivery outlet of the single-chip microcontroller, and the single-chip microcontroller connects It is connected to the temperature detecting module for detecting low temperature liquid crystal temperature;When the low temperature liquid crystal temperature is lower than -7 DEG C, the monolithic Machine exports pwm pulse to computer heating control command input LCD_Heating_CTR_O;When low temperature liquid crystal temperature is heated up to be greater than 0 DEG C when, the single-chip microcontroller exports low level.
It is exported specifically, the computer heating control command input LCD_Heating_CTR_O is connected to having for single-chip microcontroller The delivery outlet of pwm pulse function, single-chip microcontroller acquire low temperature liquid crystal temperature in real time.If low temperature liquid crystal temperature is less than -7 DEG C, monolithic The pwm pulse signal in machine output 1.2us period heats low temperature liquid crystal.It is attracted in relay K1,1 foot (common end) is attracted In the case where 3 feet (normally opened output end): when the pulse signal of output is high level, triode Q2 conducting, battery is electric at this time The electric current of source B+ passes through triode Q2 to ground after flowing through the heating sheet of low temperature liquid crystal by connector J1, carries out to low temperature liquid crystal Heating;When the pulse signal of output is low level, 2 feet (base stage) base stage of triode Q2 is low level, and triode Q2 ends, This circuit is obstructed, does not heat to low temperature liquid crystal, and entire heater circuit disconnects.If low temperature liquid crystal temperature is heated up to be greater than 0 DEG C, single-chip microcontroller exports low level, and 2 feet (base stage) base stage of triode Q2 is low level at this time, and triode Q2 cut-off, this circuit is not It is logical, low temperature liquid crystal is not heated, entire heater circuit disconnects.
In the utility model, heating sheet built in low temperature liquid crystal is realized normally in low-temperature condition by heating its heating sheet The function of work.
Finally it should be noted that: above embodiments are only to illustrate the technical solution of the utility model rather than limit it System;Although the utility model has been described in detail with reference to the preferred embodiment, those of ordinary skill in the art should Understand: specific implementation of the utility model can still be modified or is equally replaced to some technical characteristics It changes;Without departing from the spirit of technical solutions of the utility model, should all cover in the claimed technical solution of the utility model In range.

Claims (2)

1. a kind of low temperature liquid crystal heating control circuit with burn-out-proof protection, is applied to diesel engine generator set controller, feature It is, comprising: single-chip microcontroller, control heating module, connector J1 and burn-out-proof protective module;
The burn-out-proof protective module includes relay K1, diode D1, resistance R1 and triode Q1;The current collection of the triode Q1 Pole is connected to power supply end by the coil of the relay K1, and the diode D1 is connected in parallel on the coil of the relay K1 Both ends, the emitter ground connection of the triode Q1, the base stage of the triode Q1, which is closed by the resistance R1 as heating, to be referred to Input terminal LCD_Heating_OFF is enabled to be connected to the delivery outlet of the single-chip microcontroller;
The input terminal of the connector J1 is connected to the end battery supply B+, the connection by the normal open switch of the relay K1 The output end of device J1 connects the output end of the control heating module by the heating sheet of low temperature liquid crystal;
The control heating module includes resistance R2 and triode Q2;The base stage of the triode Q2 passes through the resistance R2 conduct Computer heating control command input LCD_Heating_CTR_O is connected to the pwm pulse delivery outlet of the single-chip microcontroller, the triode The emitter of Q2 is grounded, and the collector of the triode Q1 connects the connector as the output end of the control heating module The output end of J1;
The single-chip microcontroller is connected with the temperature detecting module for detecting low temperature liquid crystal temperature;
When low temperature liquid crystal temperature is lower than -7 DEG C, the single-chip microcontroller exports pwm pulse to computer heating control command input LCD_ Heating_CTR_O;When low temperature liquid crystal temperature is heated up to be greater than 0 DEG C, the single-chip microcontroller exports low level;
When low temperature liquid crystal temperature is higher than 45 DEG C, the single-chip microcontroller is to the heating out code input terminal LCD_Heating_ OFF exports low level.
2. the low temperature liquid crystal heating control circuit according to claim 1 with burn-out-proof protection, it is characterised in that: the list Piece machine model STM32F103ZET6.
CN201821545153.4U 2018-09-21 2018-09-21 A kind of low temperature liquid crystal heating control circuit with burn-out-proof protection Active CN209330421U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201821545153.4U CN209330421U (en) 2018-09-21 2018-09-21 A kind of low temperature liquid crystal heating control circuit with burn-out-proof protection

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201821545153.4U CN209330421U (en) 2018-09-21 2018-09-21 A kind of low temperature liquid crystal heating control circuit with burn-out-proof protection

Publications (1)

Publication Number Publication Date
CN209330421U true CN209330421U (en) 2019-08-30

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN201821545153.4U Active CN209330421U (en) 2018-09-21 2018-09-21 A kind of low temperature liquid crystal heating control circuit with burn-out-proof protection

Country Status (1)

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CN (1) CN209330421U (en)

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