CN210381317U

CN210381317U - Ceramic heating device

Info

Publication number: CN210381317U
Application number: CN201921260904.2U
Authority: CN
Inventors: 卓明宗; 温进坤
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-08-06
Filing date: 2019-08-06
Publication date: 2020-04-21
Anticipated expiration: 2029-08-06

Abstract

A ceramic heating device is suitable for a voltage source and comprises a ceramic heating unit, a current sensing unit, a switch unit and a control unit. The ceramic heating device controls the switch unit to be conducted or not conducted through the control unit, so that the ceramic heating unit receives the operating current to heat; detecting the magnitude of the operating current through the current sensing unit to generate an output signal; the control unit controls the switch unit to be conducted or not conducted according to the output signal, so that a real-time detection and protection mechanism can be realized.

Description

Ceramic heating device

Technical Field

The utility model relates to a device generates heat, especially indicate a pottery device that generates heat with overheat protection mechanism.

Background

A ceramic heating device is a device for heating by using a Positive Temperature Coefficient (PTC) ceramic heating sheet, and is widely applied to devices such as a bathroom heater, an indoor electric heater, and the like. The existing ceramic heating device adopts a temperature sensor to detect the temperature of the ceramic heating sheet, such as the temperature of the shell of the ceramic heating sheet, so that the device breaks down and is powered off to ensure the safety of a user. For example, when the air duct of the bathroom heater unit is blocked or the motor fails, and the heated warm air cannot be blown out smoothly, the temperature of the ceramic heating plate of the heater unit is increased, and at this time, the temperature detected by the temperature sensor is judged by a control unit (such as a microcontroller) to exceed a critical value, and then the control unit sends a control signal to disconnect the ceramic heating plate to continue to receive current and stop heating. Similarly, when the temperature of the indoor electric heater is abnormally increased due to the fact that the indoor electric heater is covered by clothes or quilts, the same monitoring and protecting mechanism is also adopted. However, the conventional method of monitoring by using a temperature sensor not only detects the temperature of the housing of the ceramic heating plate indirectly, but also is prone to damage due to frequent switch actions. Therefore, there is room for improvement in the monitoring and protection mechanism of the conventional ceramic heat generating device.

Disclosure of Invention

An object of the utility model is to provide a pottery device that generates heat with overheat protection mechanism.

Therefore, according to the utility model provides a ceramic heating device is applicable to the voltage source to contain ceramic heating unit, current sensing unit, switch unit, and the control unit.

The ceramic heating unit is electrically connected with the voltage source to receive the operation current so as to generate heat. The current sensing unit is electrically connected between the voltage source and the ceramic heating unit to detect the magnitude of the operating current received by the ceramic heating unit, and further generate a corresponding output signal.

The switch unit is electrically connected between the voltage source and the ceramic heating unit, comprises a first end electrically connected with the voltage source, a second end electrically connected with the ceramic heating unit, and a control end for receiving a control signal, and controls the first end and the second end to be conducted or not to be conducted according to the control signal.

The control unit is electrically connected with the current sensing unit and the switch unit and receives the output signal from the current sensing unit so as to control the conduction or non-conduction between the first end and the second end of the switch unit.

In other embodiments, the ceramic heat generating device further includes an alarm unit electrically connected to the control unit, and when the control unit generates the control signal to make the switch unit control the first end and the second end to be not conducted, the alarm unit is controlled to issue an alarm notification, where the alarm notification includes at least one of an alarm sound and an alarm light.

The utility model discloses a profitable effect lies in: the control unit controls the switch unit to be not conducted according to the operating current measured by the current sensing unit so as to stop providing the operating current for the ceramic heating unit, so that the ceramic heating device can be prevented from being permanently damaged.

Drawings

FIG. 1 is a block diagram illustrating one embodiment of a ceramic heat generating device of the present invention; and

fig. 2 is a graph illustrating the correspondence between the operating current and the temperature of a ceramic heat generating unit according to the embodiment.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings and examples.

Before the present invention is described in detail, it should be noted that in the following description, like elements are represented by like reference numerals.

Referring to fig. 1, an embodiment of the ceramic heating device of the present invention is suitable for a voltage source VIN, and includes a ceramic heating unit 2, a current sensing unit 3, a switch unit 4, a control unit 1, and an alarm unit 5.

The switch unit 4 includes a first terminal 41, a second terminal 42 electrically connected to the switch unit 4, and a control terminal 43 electrically connected to the control unit 1 for receiving a control signal, and controlling the first terminal 41 and the second terminal 42 to be conducted or not conducted according to the control signal, for example, according to a voltage value or a logic value of the control signal. The switch unit 4 is, for example, a relay, but not limited thereto.

The ceramic heating unit 2 is electrically connected to the voltage source VIN and the switch unit 4, and receives an operating current from the voltage source VIN when the first terminal 41 and the second terminal 42 of the switch unit 4 are turned on, so as to generate heat. The ceramic heating unit 2 includes at least one ceramic heating sheet, and when the operation current flows through the at least one ceramic heating sheet, the at least one ceramic heating sheet generates heat to cause temperature rise. Referring to fig. 2, fig. 2 exemplarily plots a corresponding relationship between an operation current and a temperature of the ceramic heat generating unit 2.

The current sensing unit 3 is electrically connected between the voltage source VIN and the first end 41 of the switch unit 4 to detect the magnitude of the operating current received by the ceramic heating unit 2, so as to generate a corresponding output signal. For example, the current sensing unit 3 converts the detected magnitude of the operating current into a voltage value representing the output signal, but not limited thereto.

The alarm unit 5 is electrically connected to the control unit 1 and is controlled to issue an alarm notification. The alarm notification includes a warning sound or a warning light, or the warning sound and the warning light. The alarm unit 5 is, for example, a buzzer and a light emitting element.

The control unit 1 is electrically connected to the current sensing unit 3 and the control terminal 43 of the switch unit 4, and generates the control signal to enable the switch unit 4 to control the conduction between the first terminal 41 and the second terminal 42, and receives the output signal from the current sensing unit 3 to obtain the magnitude of the operating current. More specifically, after the ceramic heating device is turned on, the control unit 1 turns on the switch unit 4 through the control signal, and the control unit 1 records or stores the magnitude of the operating current according to the output signal every predetermined time period, for example, 1 second, or other time duration, for example, less than 10 seconds, but not limited thereto.

When the control unit 1 determines that the magnitude of the operating current is smaller than a threshold after being turned on for a predetermined time after being turned on, the control unit generates the control signal to make the switch unit 4 control the first terminal 41 and the second terminal 42 to be non-conductive. The predetermined time after the turn-on is, for example, 10 seconds. The post-activation threshold is relative to a maximum value of the magnitude of the operating current, the post-activation threshold being, for example, 25% of the maximum value. In other words, the control unit 1 determines whether the ceramic heating device is abnormal by determining the magnitude of the operating current at the time point of 10 seconds after the ceramic heating device is turned on, and controls the switch unit 4 to be turned off when the abnormal is determined, so that the ceramic heating unit 2 stops heating without receiving the operating current, and controls the alarm unit 5 to give the alarm notification to warn the surrounding user that the ceramic heating device is abnormal.

When the control unit 1 determines that a slope value of the operating current along with the time change is less than or equal to zero and determines that the operating current is less than a set threshold, the control unit generates the control signal to make the switch unit 4 control the first terminal 41 and the second terminal 42 to be non-conductive. In the previous example, the control unit 1 calculates the slope value every 1 second, for example, the current magnitudes of the operating current at 1 second, 2 second and 3 second are 1450mA, 1500mA and 1300mA, the calculation results of the slope value at 2 second and 3 second are 50mA/sec, -200mA/sec, and the slope value at 3 second is less than or equal to zero. The set threshold is equal to a maximum value of the magnitude of the operating current multiplied by a predetermined factor, the predetermined factor being between 0 and 1, preferably between 0.6 and 0.7.

In the present embodiment, the control unit 1 prestores the maximum value of the magnitude of the operating current, and referring to fig. 2, the maximum value is 1500mA, the predetermined coefficient is, for example, 0.7, and the set threshold is 1050 mA. During the heating process of the ceramic heating unit 2 after being turned on, the temperature rises from room temperature to a set temperature (the set temperature is less than or equal to 200 ℃), and at this time, the corresponding operating current is less than the maximum value (i.e. 1500 mA). When the ceramic heating device is abnormal, the temperature of the ceramic heating unit 2 continuously rises from 200 degrees to 225 degrees, for example, at this time, the slope value is negative and the operating current (i.e., 850mA) is smaller than the set threshold value (i.e., 1050mA), the control unit 1 controls the switch unit 4 to be non-conductive, so that the ceramic heating unit 2 stops heating without receiving the operating current any more, and controls the alarm unit 5 to send the alarm notification to warn the surrounding user that the ceramic heating device is abnormal.

In other embodiments, the control unit 1 may also obtain the maximum value of the operating current according to the received output signal. For example, the control unit 1 updates the maximum value of the operating current at any time according to the output signal, and referring to fig. 2, in the process of heating up the ceramic heating unit 2 after being turned on, for example, from room temperature to 200 degrees, at this time, the control unit 1 can update the maximum value as the obtained operating current gradually increases. On the other hand, when the ceramic heating device is abnormal, the temperature of the ceramic heating unit 2 is continuously increased from 200 degrees to 225 degrees, and the corresponding operating current is also decreased from 1500mA to 850mA, however, the maximum value is still maintained at the maximum value (i.e. 1500mA), and the set threshold value is also maintained at 1050 mA.

Further, it is to be noted that: in the present embodiment, the operation current is not limited to a direct current or an alternating current, and can be implemented accordingly. Moreover, in other embodiments, the current sensing unit 3 and the switch unit 4 can also be electrically connected at different positions, as long as the current sensing unit 3 is electrically connected between the voltage source VIN and the ceramic heating unit 2 to detect the magnitude of the operating current, and the switch unit 4 is electrically connected between the voltage source VIN and the ceramic heating unit 2 to control the ceramic heating unit 2 to receive or not receive the operating current.

To sum up, the utility model discloses do not need temperature-sensing ware to listen the temperature of ceramic heating unit, but utilize the physical characteristics of ceramic heating piece itself, for example because of wind channel blockage or motor trouble at bathroom electric fan heater, or indoor electric heater is covered by clothing or cotton-wadded quilt for the temperature of ceramic heating piece is after exceeding its physical temperature, and the phenomenon that the electric current of consumption can suddenly drop. Therefore, when the control unit determines that the slope value is negative and the operating current is smaller than the set threshold value through the operating current measured by the current sensing unit, the control unit controls the switch unit to stop providing the operating current to the ceramic heating unit so as to prevent the ceramic heating device from being permanently damaged, and also controls the alarm unit to give an alarm, so that the purpose of the present invention can be achieved.

The above description is only an example of the present invention, and the scope of the present invention should not be limited thereby, and all the simple equivalent changes and modifications made in the claims and the description of the present invention are also included in the scope of the present invention.

Claims

1. A ceramic heating device adapted for use with a voltage source, comprising: the ceramic heat generating device includes:

the ceramic heating unit is electrically connected with the voltage source to receive the operation current so as to heat;

the current sensing unit is electrically connected between the voltage source and the ceramic heating unit to detect the magnitude of the operating current received by the ceramic heating unit so as to generate a corresponding output signal;

the switch unit is electrically connected between the voltage source and the ceramic heating unit, comprises a first end electrically connected with the voltage source, a second end electrically connected with the ceramic heating unit and a control end for receiving a control signal, and controls the first end and the second end to be conducted or not to be conducted according to the control signal; and

and the control unit is electrically connected with the current sensing unit and the switch unit and receives the output signal from the current sensing unit so as to control the conduction or non-conduction between the first end and the second end of the switch unit.

2. The ceramic heat-generating device according to claim 1, characterized in that: the ceramic heating device further comprises an alarm unit which is electrically connected with the control unit, when the control unit generates the control signal to enable the switch unit to control the first end and the second end to be not conducted, the alarm unit is controlled to send out an alarm notice, and the alarm notice comprises at least one of warning sound and warning light.