Actuator's heater under a kind of ice-cold environment
Technical field
The utility model relates to actuator's heater under a kind of ice-cold environment, belongs to low temperature environment specific automation control field.
Background technology
Along with automation control and monitoring, for example, in the extensive application of the low temperature such as food, medicine field (refrigerator car), the reliability of actuator and time between overhauls(TBO) become the important indicator of its whole system.Actuator is used for a long time in Low-temperature Ice cold environment, and its surface and inner easy frosting are even freezing, thereby cause destabilizing factor and fault.
Utility model content
The deficiency that the utility model exists for prior art, actuator's heater under a kind of ice-cold environment is provided, easily frosting is even freezing in low temperature environment to have solved traditional actuator, and inhomogeneous, the temperature or high or low of heating arrangements heating in the past, thereby the problem of initiation destabilizing factor and fault.
The technical scheme that the utility model solves the problems of the technologies described above is as follows: actuator's heater under a kind of ice-cold environment, comprise heater circuit, heater strip and actuator, described actuator is provided with a temperature feedback detecting element, described temperature feedback detecting element is connected with described heater circuit, described heater circuit comprises power supply terminal, heater strip binding post, power supply chip and temperature-control circuit, described power supply chip one end and supply terminals sub-connection, the other end is connected with temperature-control circuit and heater strip binding post, give temperature-control circuit and the power supply of heater strip binding post, described heater strip binding post is electrically connected with heater strip.
Further, described temperature-control circuit comprises the given module of temperature, feed back amplifying module, comparator, the given module of described temperature, feed back amplifying module are connected with two inputs of described comparator respectively, the output of described comparator is connected with a PWM controller, on described PWM controller, be connected with an overrun control, the described overrun control other end is connected with a heater strip electronic switch, and described heater strip electronic switch is connected with described heater strip binding post.
Further, described temperature feedback detecting element is temperature sensor.
Further, described overrun control is 555 timers.
Further, described heater strip electronic switch is metal-oxide-semiconductor or transistor.
The beneficial effects of the utility model are: the utility model is simple and reasonable, homogeneous heating, can be for actuator heats in low temperature, carry out temperature acquisition and be sent to temperature-control circuit by temperature feedback detecting element, carry out accuracy controlling according to ambient temperature, make actuator carry out work in suitable temperature all the time, ensured the high reliability of actuator in low temperature environment, effectively reduce actuator's generation probability of fault at work.
Brief description of the drawings
Fig. 1 is operating state connection diagram of the present utility model;
Fig. 2 is the structural framing schematic diagram of the utility model heater circuit;
Wherein, 1, heater circuit; 2, heater strip; 3, actuator; 4, temperature feedback detecting element; 5, power supply terminal; 6, heater strip binding post; 7, power supply chip; 8, temperature-control circuit; 81, the given module of temperature; 82, feed back amplifying module; 83, comparator; 84, PWM controller; 85, overrun control; 86, heater strip electronic switch.
Embodiment
Below in conjunction with accompanying drawing, principle of the present utility model and feature are described, example, only for explaining the utility model, is not intended to limit scope of the present utility model.
Actuator's 3 heaters under a kind of ice-cold environment, comprise heater circuit 1, heater strip 2 and actuator 3, described actuator 3 is provided with a temperature feedback detecting element 4, described temperature feedback detecting element 4 is connected with described heater circuit 1, described heater circuit 1 comprises power supply terminal 5, heater strip binding post 6, power supply chip 7 and temperature-control circuit 8, described power supply chip 7 one end are connected with power supply terminal 5, the other end is connected with temperature-control circuit 8 and heater strip binding post 6, power to temperature-control circuit 8 and heater strip binding post 6, described heater strip binding post 6 is electrically connected with heater strip 2.
Described temperature-control circuit 8 comprises the given module 81 of temperature, feed back amplifying module 82, comparator 83, the given module 81 of described temperature, feed back amplifying module 82 are connected with two inputs of described comparator 83 respectively, the output of described comparator 83 is connected with a PWM controller 84, on described PWM controller 84, be connected with an overrun control 85, described overrun control 85 other ends are connected with a heater strip electronic switch 86, and described heater strip electronic switch 86 is connected with described heater strip binding post 6.
Described temperature feedback detecting element 4 is temperature sensor.
Described overrun control 85 is 555 timers.
Described heater strip electronic switch 86 is metal-oxide-semiconductor or transistor.
In the utility model, power supply chip 7 is DC/DC power supply chip 7.
The course of work of the present utility model is as follows:
The utility model is in the time of work, input 24V direct current at power supply terminal 5, power supply terminal 5 is connected with power supply chip 7, power to heater circuit 1 and heater strip 2 by power supply chip 7, temperature feedback detecting element 4 detects the residing temperature of actuator 3, and by temperature Real-time Feedback to the feed back amplifying module 82 in heater circuit 1, feed back amplifying module 82 amplifies signal, carry out signal comparison with the given module 81 of temperature by comparator 83, comparator 83 by the signal feedback after relatively to PWM controller 84, analog signal is changed into digital signal by PWM controller 84, and digital signal is sent to overrun control 85, heater strip electronic switch 86 is controlled, thereby heating time and the temperature of regulation and control heater strip 2, heater strip 2 is connected with actuator 3, thereby heat up for actuator 3 by heater strip 2, guarantee actuator 3 works at suitable temperature.
The foregoing is only preferred embodiment of the present utility model, not in order to limit the utility model, all within spirit of the present utility model and principle, any amendment of doing, be equal to replacement, improvement etc., within all should being included in protection range of the present utility model.