Temperature controller

Abstract

The utility model discloses a temperature controller, which is characterized by comprising a power interface, a silicon controlled rectifier unit, a first relay, a second relay, a heating device and a central control unit, the power interface is connected with an external power supply; the power interface supplies power to the heating device through a series branch of the silicon controlled unit and the first relay. The second relay is connected to the two ends of the series branch of the silicon controlled unit and the first relay in parallel. The central control unit is respectively connected with the control ends of the silicon controlled unit, the first relay and the second relay and respectively controls the on and off of the silicon controlled unit, the first relay and the second relay. According to the utility model, the service life of the silicon controlled rectifier can be effectively prolonged, and problems caused by short-circuit faults or open-circuit faults of the silicon controlled rectifier are avoided.

Description

Technical Field

[0001] The utility model belongs to the field of intelligent temperature control, and particularly relates to a temperature controller. Background Art

[0002] Traditional temperature controllers adopt a single thyristor scheme, where a separate thyristor is used to complete the output control of the heating device. The thyristor is connected to the power supply circuit of the heating device, and by controlling the conduction time of the thyristor, the working time of the heating device is controlled, so as to achieve the effect of controlling the heating temperature.

[0003] The disadvantages of such a scheme are that, on the one hand, the thyristor will generate a large amount of heat under high-power heating, which is not conducive to the service life of the thyristor; on the other hand, when a short-circuit fault occurs in the thyristor, continuous heating will occur, which may cause potential safety hazards, and when an open-circuit fault occurs, heating will stop, and the heating device cannot guarantee normal operation.

[0004] In view of this, a new temperature control device needs to be proposed to solve the above problems. Summary of the Utility Model

[0005] To solve the problems commonly existing in the prior art, the utility model proposes a temperature controller, which can effectively improve the service life of the thyristor and avoid the problems caused by short-circuit faults or open-circuit faults of the thyristor.

[0006] The technical solution adopted by the utility model is as follows:

[0007] A temperature controller, characterized by comprising: a power supply interface, a thyristor unit, a first relay, a second relay, a heating device and a central control unit;

[0008] The power supply interface is used to connect to an external power supply;

[0009] The power supply interface provides power for the heating device through a series branch of the thyristor unit and the first relay, and the second relay is connected in parallel at both ends of the series branch of the thyristor unit and the first relay;

[0010] The central control unit is respectively connected to the control ends of the thyristor unit, the first relay and the second relay, and respectively controls the closing and opening of the thyristor unit, the first relay and the second relay.

[0011] Further, it further comprises a temperature sensor, and the temperature sensor is connected to the central control unit.

[0012] Further, the temperature sensor is a thermistor.

[0013] Further, it further includes a power supply module, which is respectively connected to the power interface and the central control unit and is used to convert an external power supply into a DC power supply required by the central control unit.

[0014] Further, the external power supply is an AC power supply, and the thyristor unit includes a bidirectional thyristor.

[0015] Further, the thyristor unit is a solid-state relay.

[0016] Further, the heating device is a resistance wire.

[0017] Further, the heating device is a heating lamp.

[0018] Further, the heating device is a graphene heating pad.

[0019] The beneficial effects of the present utility model are as follows:

[0020] Based on the original temperature control circuit with a single thyristor, in the branch containing the thyristor unit, a first relay is connected in series to form a first branch with the thyristor and the relay. Additionally, a second branch including a second relay is connected in parallel to the first branch. In this way, the second branch can be used to supply power to the heating device in the high-power heating state, and the first branch can be used to supply power to the heating device in the low-power heating state, effectively improving the service life of the thyristor. Also, when a short-circuit fault occurs in the thyristor, the heating device can be powered by controlling the first relay, and when an open-circuit fault occurs in the thyristor, the heating device can be powered by controlling the second relay, avoiding problems caused by thyristor faults. Description of the Drawings

[0021] Figure 1 is a schematic structural diagram of an embodiment of a temperature controller of the present utility model.

[0022] In the figure:

[0023] 1 - power interface, 2 - thyristor unit, 3 - first relay, 4 - second relay, 5 - heating device, 6 - central control unit, 7 - temperature sensor, 8 - power supply module. Detailed Embodiments

[0024] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Apparently, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present application.

[0025] The terms "first", "second", and "third" in this application are only for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity or order of the indicated technical features. All directional indications (such as up, down, left, right, front, back...) in the embodiments of this application are only used to explain the relative positional relationship or movement situation between components in a specific posture (as shown in the drawings); it should be noted that when a component is referred to as "fixed to", "disposed on", "connected to" another component, it can be directly on the other component or there may also be intermediate components. When a component is considered to be "connected" to another component, it can be directly connected to the other component, or there may be one or more intermediate components therebetween. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for illustrative purposes and do not represent the only implementation.

[0026] See Figure 1 , an embodiment of the temperature controller proposed by the present utility model includes: a power supply interface 1, a thyristor unit 2, a first relay 3, a second relay 4, a heating device 5, and a central control unit 6.

[0027] The power supply interface 1 is used to connect to an external power supply. The power supply interface 1 supplies power to the heating device 5 through a series branch of the thyristor unit 2 and the first relay 3, and the second relay 4 is connected in parallel at both ends of the series branch of the thyristor unit 2 and the first relay 3. The central control unit 6 is respectively connected to the control terminals of the thyristor unit 2, the first relay 3, and the second relay 4, and respectively controls the closing and opening of the thyristor unit 2, the first relay 3, and the second relay 4.

[0028] Based on the original temperature control circuit with a single thyristor, in the embodiment of the present utility model, a first relay 3 is connected in series in the branch containing the thyristor unit 2 to form a first branch of a thyristor plus a relay, and a second branch including a second relay 4 is separately connected in parallel on the first branch. In this way, the service life of the thyristor can be effectively improved, and the problems caused by short - circuit or open - circuit faults of the thyristor can be avoided.

[0029] The specific working logic is as follows: in the high - power working state, the second relay 4 is in the closed state and the first relay 3 is in the open state. The heating device 5 is directly powered by the second relay 4, which can heat up faster and can also prevent the thyristor unit 2 from being damaged due to excessive heat generation in the high - power working state; while in the low - power working state, the second relay 4 is in the open state and the first relay 3 is in the closed state. At this time, the heat generation amount of the heating device 5 is controlled by the thyristor unit 2. For example, by controlling the conduction duration, conduction frequency, or conduction angle of the thyristor unit 2 to control the power supply period of the heating device 5, and further control the heat generation amount of the heating device 5.

[0030] When a short - circuit fault occurs in the thyristor unit 2, the second relay 4 can be controlled to be in an open state, and the first relay 3 can be controlled to be closed or opened according to the control of the central control unit 6 to control the power - on time of the heating device 5, thereby controlling the calorific value of the heating device; when an open - circuit fault occurs in the thyristor unit 2, the first relay 3 can be controlled to be in an open state, and the second relay 4 can be controlled to be closed or opened according to the control of the central control unit 6 to control the power - on time of the heating device, thereby controlling the calorific value of the heating device 5.

[0031] In some embodiments, a temperature sensor 7 is further included, and the temperature sensor 7 is connected to the central control unit 6. The actual temperature status can be real - time fed back to the central control unit 6 through the temperature sensor 7 to select a suitable heating power control mode. When the preset temperature is much higher than the actual temperature, a high - power working state can be adopted to rapidly increase the temperature; when the preset temperature is close to the actual temperature, a low - power working state can be adopted to prevent over - temperature.

[0032] In some embodiments, the temperature sensor 7 is a thermistor.

[0033] In some embodiments, a power supply module 8 is further included. The power supply module 8 is respectively connected to the power interface 1 and the central control unit 6, and is used to convert the external power supply into the DC power supply required by the central control unit 6.

[0034] In some embodiments, the external power supply is an AC power supply, and the thyristor unit 2 includes a bidirectional thyristor.

[0035] In some embodiments, the thyristor unit 2 is a solid - state relay (SSR).

[0036] In some embodiments, the heating device 5 is a resistance wire.

[0037] In some embodiments, the heating device 5 is a heating lamp.

[0038] In some embodiments, the heating device 5 is a graphene heating pad.

[0039] The utility model is not limited to the above - mentioned optional embodiments. Anyone can obtain other various forms of products under the inspiration of the utility model. However, no matter what changes are made in its shape or structure, as long as the technical solutions fall within the scope defined by the claims of the utility model, they are all within the protection scope of the utility model.

Claims

1. A temperature controller, characterized in that: include: A power interface, a thyristor unit, a first relay, a second relay, a heating device and a central control unit; The power interface is used to connect to an external power source; The power interface provides power to the heating device through a series branch of the thyristor unit and the first relay, and the second relay is connected in parallel to both ends of the series branch of the thyristor unit and the first relay; The central control unit is connected to the control ends of the thyristor unit, the first relay and the second relay respectively, and controls the closing and opening of the thyristor unit, the first relay and the second relay respectively.

2. A temperature controller according to claim 1, characterized in that: It also includes a temperature sensor, which is connected to the central control unit.

3. A temperature controller according to claim 2, characterized in that: The temperature sensor is a thermistor.

4. A temperature controller according to claim 1, characterized in that: It also includes a power supply module, which is connected to the power interface and the central control unit respectively and is used to convert the external power supply into a DC power supply required by the central control unit.

5. A temperature controller according to claim 1, characterized in that: The external power source is an alternating current power source, and the thyristor unit includes a bidirectional thyristor.

6. A temperature controller according to claim 1, characterized in that: The thyristor unit is a solid-state relay.

7. A temperature controller according to claim 1, characterized in that: The heating device is a resistance wire.

8. A temperature controller according to claim 1, characterized in that: The heating device is a heating lamp.

9. A temperature controller according to claim 1, characterized in that: The heating device is a graphene heating pad.

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