Temperature control method for heat source

Abstract

The invention discloses a temperature control method for a heat source, and belongs to the technical field of temperature control. Voltage is applied to two ends of a heat source with certain impedance, so that current flows through the heat source to generate heat; reading the corresponding temperature of the heat source under the condition of required specific energy and spectrum from the lookup table; and determining the resistance corresponding to the temperature according to the resistance-temperature characteristic curve of the heat source. According to the resistance-temperature characteristic curve of the heat source made of the material, the current flowing through the heat source is controlled, so that the resistance of the heat source is adjusted to a resistance value corresponding to the required temperature, and the heat source is controlled at the specific temperature. According to the method, contact type detection on the temperature of the heat source is not needed, the temperature of the heat source can be accurately adjusted according to actual requirements, and the temperature of the heat source can be controlled at a stable value by controlling current.

Description

Technical Field

[0001] The present invention relates to the technical field of temperature control, and in particular to a temperature control method for a heat source. Background Art

[0002] When a heat source is heated, it will generate heat and spectrum, and the spectrum and heat generated are related to the material of the heat source itself (different materials), such as Figure 1 As shown in the figure, for a heat source made of a specific material, the spectrum frequencies generated at different temperatures are different, and the amount of heat generated is also different.

[0003] In practical applications, a heat source is often required to generate a spectrum of a specific wavelength, such as 3000μm. Under this wavelength spectrum, if the heat source is required to generate a specific required energy, its temperature must be controlled at the temperature corresponding to this energy. This temperature is generally several hundred degrees and is difficult to measure using a thermometer or other device. Therefore, it is difficult to achieve stable temperature control at the required value. Summary of the Invention

[0004] The object of the present invention is to provide a temperature control method for a heat source to solve the problems in the background technology.

[0005] To solve the above technical problems, the present invention provides a method for controlling the temperature of a heat source, comprising:

[0006] By applying a voltage across a heat source with a certain impedance, current flows through the heat source to generate heat;

[0007] According to the resistance-temperature characteristic curve of the heat source, the resistance of the heat source is adjusted to a resistance value corresponding to a desired temperature, so as to control the heat source at the specific temperature.

[0008] In one possible implementation, the resistance of the heat source is adjusted by:

[0009] According to the obtained voltage difference ΔV between the two ends of the heat source or one section of the heat source and the current I flowing through the heat source, the current resistance value R=ΔV / I of the heat source is obtained;

[0010] The current I flowing through the heat source or the voltage applied to both ends of the heat source is adjusted to change the temperature of the heat source, thereby adjusting the resistance R of the heat source.

[0011] In one possible implementation, the resistance of the heat source is adjusted by:

[0012] The resistance value R' of the temperature measuring resistor is obtained by obtaining the voltage difference ΔV' on the temperature measuring resistor located near the heat source and the current I' flowing through the temperature measuring resistor. The current I flowing through the heat source is adjusted to change the temperature of the heat source, thereby adjusting the resistance R' of the temperature measuring resistor.

[0013] In one possible implementation, the method further includes:

[0014] Reading from a lookup table the temperature corresponding to the heat source when radiating a specific energy and spectrum;

[0015] The resistance corresponding to the temperature is determined based on the resistance-temperature characteristic curve of the heat source or temperature measuring resistor.

[0016] In one feasible implementation, the functions of reading the lookup table and controlling the adjustment current or voltage are implemented by digital control logic.

[0017] In one feasible embodiment, the digital control logic controls a controllable current source by driving a current-type DAC to adjust the current flowing through the heat source; or the digital control logic controls a controllable voltage source by driving a voltage-type DAC to adjust the voltage loaded across the heat source.

[0018] In a feasible implementation, the controllable current source is a current source or a current sink.

[0019] In a feasible implementation, the current-mode DAC includes N current sources, and each current source is independently connected to or not connected to the output terminal of the current-mode DAC.

[0020] In one feasible implementation, the digital control logic reads a lookup table from a storage module, or implements the lookup table in the digital control logic using logic.

[0021] In one feasible embodiment, the lookup table includes but is not limited to the temperature-spectrum-energy characteristics of heat sources of various materials, the resistance-temperature characteristic curves of heat sources of various materials, the control target temperature, resistance, and other relevant functional parameters of the heat source.

[0022] In a feasible implementation, the storage module includes but is not limited to a non-volatile memory, a register or other devices capable of implementing a storage function.

[0023] In a feasible implementation, the storage module is configured externally via a digital interface.

[0024] In a feasible implementation, the voltage difference between the two ends of the heat source or one section of the heat source is detected by an ADC.

[0025] In a feasible implementation, the voltage difference across the temperature measuring resistor is detected by an ADC.

[0026] In one possible embodiment, the heat source includes a resistor, an infrared radiation medium, or other medium that generates heat and emits a spectrum when current passes through it.

[0027] The present invention provides a method for controlling the temperature of a heat source. The method applies a voltage across a heat source with a certain impedance, causing current to flow through the heat source, thereby generating heat. The temperature corresponding to the heat source under the desired specific energy and spectrum is read from a lookup table. The resistance corresponding to the temperature is determined based on the resistance-temperature characteristic curve of the heat source. Based on the resistance-temperature characteristic curve of the heat source material, the current flowing through the heat source is controlled, and the resistance of the heat source is adjusted to the resistance value corresponding to the desired temperature, thereby achieving control of the heat source at a specific temperature. The method of the present invention does not require contact detection of the heat source temperature, can accurately adjust the heat source temperature according to actual needs, and can control the heat source temperature at a stable value by controlling the current. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0029] Figure 1 It is a schematic diagram of the temperature-spectrum-energy characteristics of the heat source.

[0030] Figure 2 It is a schematic diagram of the principle of an embodiment of the temperature control method of the heat source provided by the present invention.

[0031] Figure 3 It is a schematic diagram showing the principle of another embodiment of the temperature control method of the heat source provided by the present invention.

[0032] Figure 4 It is a structural diagram of the current-mode DAC provided by the present invention. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making any creative efforts shall fall within the scope of protection of this application.

[0034] The present invention provides a method for controlling the temperature of a heat source. The main operating steps are: applying a voltage across a heat source having a certain impedance to cause current to flow through the heat source; when current flows through the heat source, the temperature of the heat source rises and falls with the magnitude of the current, and the resistance of the heat source also changes with the rise and fall of the temperature; if the heat source is made of a certain material, there is a specific relationship between its resistance and temperature, namely, an RT (resistance-temperature) curve. Based on the specific RT curve of a heat source made of a specific material, the resistance of the heat source is adjusted to the resistance value corresponding to the desired temperature to achieve control of the heat source at a specific temperature.

[0035] like Figure 2 As shown, in this embodiment, the method for adjusting the resistance of the heat source is: detecting the voltage difference ΔV at both ends of the heat source or one section of the heat source through the ADC, and setting the current I flowing through the heat source through the controllable current source to obtain the current resistance value R=ΔV / I of the heat source; or detecting the voltage difference ΔV' of the temperature measuring resistor located near the heat source and the current I' flowing through the temperature measuring resistor through the ADC to obtain the resistance value R'=ΔV' / I' of the temperature measuring resistor; adjusting the current I flowing through the heat source to change the temperature of the heat source, thereby adjusting the resistance R' of the temperature measuring resistor, the material of the temperature measuring resistor can be the same as or similar to that of the heat source; or directly measuring the resistance value of the heat source in real time through a resistance tester, all of which fall within the scope of protection of the present invention. The temperature of the heat source is changed by adjusting the current flowing through the heat source through a controllable current source, or by adjusting the voltage loaded at both ends of the heat source through a controllable voltage source. At this time, the resistance value of the heat source also increases or decreases with the change in temperature. The current flowing through the heat source or the voltage loaded at both ends of the heat source is adjusted according to the detected heat source resistance value, so that the heat source resistance is controlled at the required resistance value.

[0036] Furthermore, the temperature corresponding to the heat source of the material radiating a specific energy and spectrum is first read from the lookup table through digital control logic, such as Figure 1 As shown, for example, if the heat source emits a spectrum with a wavelength of 3000μm and the energy is 500KeV, then the temperature of the heat source needs to be controlled to T1; then the resistance value corresponding to the temperature T1 is determined based on the RT curve of the material heat source; then the digital control logic drives the current-type DAC to control the controllable current source to adjust the current flowing through the heat source, or the digital control logic drives the voltage-type DAC to control the controllable voltage source to adjust the voltage loaded on both ends of the heat source, so that the temperature of the heat source changes, thereby adjusting the resistance R of the heat source. Furthermore, the controllable current source can be a Sink-type current (pulling current) or a Source-type current (sinking current), which is not limited here and is within the scope of the present invention.

[0037] The lookup table can be directly implemented in the data logic control using logic, or the lookup table can be stored in a storage module. The parameters of the lookup table include, but are not limited to, the temperature-spectrum-energy characteristics of various heat source materials, the RT characteristics of various heat source materials, the control target temperature, resistance, and other relevant functional parameters of the heat source. After determining the material of the heat source, the digital control logic reads the lookup table and determines the temperature value that needs to be stabilized based on the specified wavelength and energy emitted by the heat source of that specific material. The resistance value that needs to be controlled is then determined based on the RT characteristic curve of the heat source of that material. The storage module can be a non-volatile memory or register, or other device capable of performing storage functions. In addition, the storage module is configured externally via a digital interface.

[0038] like Figure 4 The figure shows a schematic diagram of the structure of a current-mode DAC, which includes n current sources. Each current source can be independently connected to or disconnected from the output end of the current-mode DAC through a switch to adjust the current size.

[0039] There is no specific limitation on the heat source above. The heat source can be a resistor, an infrared radiation medium, or other media that generate heat and emit a spectrum when current passes through. They are also within the scope of protection of the present invention and are not listed here one by one.

[0040] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0041] The above embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art could make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A method for controlling the temperature of a heat source, characterized in that: include: By applying a voltage across a heat source with a certain impedance, current flows through the heat source to generate heat; According to the resistance-temperature characteristic curve of the heat source, the resistance of the heat source is adjusted to a resistance value corresponding to a desired temperature, so as to control the heat source at the specific temperature.

2. The temperature control method of the heat source according to claim 1, wherein: The resistance of the heat source was adjusted as follows: According to the obtained voltage difference ΔV between the two ends of the heat source or one section of the heat source and the current I flowing through the heat source, the current resistance value R=ΔV / I of the heat source is obtained; The current I flowing through the heat source or the voltage applied to both ends of the heat source is adjusted to change the temperature of the heat source, thereby adjusting the resistance R of the heat source.

3. The temperature control method of a heat source according to claim 1, wherein: The resistance of the heat source was adjusted as follows: The resistance value R' of the temperature measuring resistor is obtained by obtaining the voltage difference ΔV' on the temperature measuring resistor located near the heat source and the current I' flowing through the temperature measuring resistor. The current I flowing through the heat source is adjusted to change the temperature of the heat source, thereby adjusting the resistance R' of the temperature measuring resistor.

4. The method for controlling the temperature of a heat source according to claim 2 or 3, wherein: The method further comprises: Reading from a lookup table the temperature corresponding to the heat source when radiating a specific energy and spectrum; The resistance corresponding to the temperature is determined based on the resistance-temperature characteristic curve of the heat source or temperature measuring resistor.

5. The temperature control method of the heat source according to claim 4, characterized in that: The functions of reading the lookup table and controlling the current or voltage are realized through digital control logic.

6. The method for controlling the temperature of a heat source according to claim 5, wherein: The digital control logic controls the controllable current source by driving the current-type DAC to adjust the current flowing through the heat source; or the digital control logic controls the controllable voltage source by driving the voltage-type DAC to adjust the voltage loaded at both ends of the heat source.

7. The method for controlling the temperature of a heat source according to claim 6, wherein: The controllable current source is a current source or a current sink.

8. The method for controlling the temperature of a heat source according to claim 6, wherein: The current-mode DAC includes N current sources, and each current source is independently connected to or disconnected from the output terminal of the current-mode DAC.

9. The method for controlling the temperature of a heat source according to claim 5, wherein: The digital control logic reads the lookup table from the storage module, or implements the lookup table in the digital control logic using logic.

10. The method for controlling the temperature of a heat source according to claim 9, wherein: The lookup table includes but is not limited to temperature-spectrum-energy characteristics of heat sources of various materials, resistance-temperature characteristic curves of heat sources of various materials, control target temperature, resistance, and other relevant functional parameters of the heat source.

11. The method for controlling the temperature of a heat source according to claim 9, wherein: The storage module includes but is not limited to a non-volatile memory, a register or other devices capable of implementing a storage function.

12. The method for controlling the temperature of a heat source according to claim 9, wherein: The storage module is configured externally via a digital interface.

13. The method for controlling the temperature of a heat source according to claim 2, wherein: The voltage difference between the two ends of the heat source or one section of the heat source is detected by ADC.

14. The method for controlling the temperature of a heat source according to claim 3, wherein: The voltage difference between the two ends of the temperature measuring resistor is detected by ADC.

15. The method for controlling the temperature of a heat source according to claim 1, wherein: The heat source includes a resistor, an infrared radiation medium, or other medium that generates heat and emits a spectrum when an electric current passes through it.

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