Induction heating circuit capable of adaptively adjusting power

Abstract

The utility model relates to an induction heating circuit capable of adaptively adjusting power, and the circuit comprises a sine wave inverse module which is used for converting a DC voltage inputted by a power supply end into a sine AC voltage; the temperature measuring module is used for detecting the temperature of the heated object in real time and generating a temperature signal, and the temperature signal carries a temperature numerical value; the temperature comparison module is used for comparing the temperature value with a preset temperature threshold value to obtain a comparison result; the regulation control module is used for generating a control signal for regulating power based on the comparison result; and the induction heating module is used for adjusting the sine alternating-current voltage according to the control signal and heating a heated object under the action of the adjusted sine alternating-current voltage. The circuit voltage is adjusted through the adjusting control module according to the comparison condition of the actual temperature and the needed temperature, and the problem that the accuracy of induction heating is low is effectively solved.

Description

Technical Field

[0001] This application relates to the technical field of induction heating, and in particular to an induction heating circuit with adaptively adjustable power. Background Technology

[0002] Induction heating relies on the law of electromagnetic induction, which states that when a conductor passes through a changing magnetic field, an alternating induced current is generated inside the conductor. This induced current passes through a coil, generating a changing magnetic field. The alternating magnetic field produces eddy currents, which, through resistive losses, achieve the heating effect. Eddy currents are circular currents formed inside the conductor by the induced current. Their direction and magnitude change with the alternating current supply. The magnitude of the eddy currents is related to the conductor material, conductor shape, and the rate of change of the magnetic field.

[0003] The temperature control requirements for induction heating using eddy currents vary depending on the specific process. Traditionally, the heating power is adjusted manually, which relies heavily on the technician's expertise in controlling the temperature during the process. This can easily lead to issues such as untimely power adjustment or failure to select the appropriate power, resulting in lower accuracy of induction heating. Utility Model Content

[0004] To improve the problem of low accuracy in induction heating, this application provides an induction heating circuit with adaptively adjustable power.

[0005] The induction heating circuit with adaptive power adjustment provided in this application adopts the following technical solution:

[0006] An adaptively adjustable power induction heating circuit includes:

[0007] The sine wave inverter module is used to convert the DC voltage input to the power supply terminal into a sinusoidal AC voltage.

[0008] The temperature measurement module is used to detect the temperature of the heated object in real time and generate a temperature signal, which carries a temperature value.

[0009] The temperature comparison module is used to compare the temperature value with a preset temperature threshold in real time to obtain the comparison result.

[0010] An adjustment and control module is used to generate a control signal for adjusting power based on the comparison result and adjust the sinusoidal AC voltage according to the control signal.

[0011] The induction heating module is used to heat the object being heated under the action of the adjusted sinusoidal AC voltage.

[0012] By adopting the above technical solution, the DC voltage is first converted into a sinusoidal AC voltage by the sinusoidal inverse module, and then the object to be heated is heated with the rated initial power. At the same time, the temperature measurement module detects the temperature of the object to be heated in real time, and the temperature comparison module compares the temperature value with the temperature threshold in real time. Then, the adjustment and control module generates a corresponding control signal based on the comparison result and adjusts the magnitude of the sinusoidal AC voltage according to the control signal. Finally, the induction heating module heats the object to be heated by the adjusted sinusoidal AC voltage.

[0013] Therefore, the induction heating circuit of this application can accelerate the heating speed by increasing the voltage when the temperature of the heated object has not reached the temperature threshold, i.e., the required temperature, or maintain the current rated voltage to continue heating; while when the temperature of the heated object is close to or reaches the temperature threshold, the heating speed is slowed down by decreasing the voltage, so as to keep the temperature of the heated object as stable as possible.

[0014] In summary, this application significantly improves the temperature stability of the heated object and realizes automatic adjustment of circuit voltage to regulate heating power according to the temperature of the heated object, greatly improving the problem of low accuracy of induction heating.

[0015] In one specific implementation scheme, a signal amplification module is further included, connected to the temperature measurement module and the temperature comparison module, for amplifying the amplitude of the temperature signal.

[0016] By adopting the above technical solution, the signal amplification module enables the temperature signal to be better transmitted in the circuit, and the temperature value information carried in the temperature signal is not easily submerged, which improves the accuracy of the induction heating circuit in adjusting the heating power of the circuit according to the temperature value to a certain extent.

[0017] In one specific implementation scheme, an abnormality warning module is also included, which is connected to the temperature measurement module and is used to issue a temperature warning when the temperature value exceeds a preset maximum temperature threshold.

[0018] By adopting the above technical solution, an early warning can be issued when the induction heating circuit fails to adjust the circuit heating power in a timely manner for some reason, so that personnel can detect and remedy the situation in time.

[0019] In one specific implementation scheme, a gating switch module is also included, connected between the power supply terminal and the sine wave inverse module. The induction heating circuit is controlled by the gating switch module to select to connect the first path or the second path.

[0020] The first path is used to detect the temperature of the heated object in real time through the temperature measurement module and generate a temperature signal;

[0021] The second path is used to issue a temperature warning when the temperature value exceeds the maximum temperature threshold via the anomaly warning module.

[0022] By adopting the above technical solution, the first path only detects the temperature of the heated object in real time, while the second path can both detect the temperature and provide early warnings based on the temperature. The two can be switched according to actual needs. That is, the second path can be selected when personnel are not available to pay attention, and the first path can be selected when personnel are observing to reduce energy consumption.

[0023] In one specific implementation, the power supply terminal includes a first power supply and a second power supply; the gating switch module includes a first switch and a second switch, the control terminal of the first switch is connected to the first power supply to form the first path; the control terminal of the second switch is connected to the second power supply to form the second path; both the first power supply and the second power supply are connected to the sine wave inverse module.

[0024] In one specific implementation, the temperature measurement module includes a first resistor and a thermistor, which are connected in series between the gating switch module and ground.

[0025] In one specific implementation, the adjustment control module includes a manual submodule and an automatic submodule. The manual submodule is used to generate a control signal for adjusting power based on parameters manually input according to the comparison result, and the automatic submodule is used to automatically generate a control signal for adjusting power based on the comparison result.

[0026] By adopting the above technical solution, the induction heating circuit of this application can realize both manual control and intelligent automatic control, and can adapt to various needs.

[0027] In one specific implementation, the temperature measurement module provides the measurement voltage through a first input node, and the sine wave inverse module provides the sinusoidal AC voltage through a second input node.

[0028] In one specific implementation, the temperature comparison module includes a temperature comparator. The inverting input of the temperature comparator is connected to the first input node via a control switch, the non-inverting input of the temperature comparator is connected to the second input node via a second resistor, and the output of the temperature comparator is connected to the non-inverting input via a third resistor and a fourth resistor in sequence.

[0029] In summary, this application includes at least one of the following beneficial technical effects:

[0030] 1. This application significantly improves the temperature stability of the heated object;

[0031] 2. It realizes the automatic adjustment of circuit voltage to regulate heating power according to the temperature of the heated object, which greatly improves the problem of low accuracy of induction heating;

[0032] 3. It enables free switching between manual control and intelligent automatic control, and can adapt to various needs. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of an adaptively adjustable power induction heating circuit according to an embodiment of this application.

[0034] Explanation of reference numerals in the attached diagram: 1. Sine wave inversion module; 2. Temperature measurement module; 3. Temperature comparison module; 4. Adjustment and control module; 41. Manual sub-module; 42. Automatic sub-module; 5. Induction heating module; 6. Signal amplification module; 7. Anomaly warning module; 8. Selection switch module; 81. First switch; 82. Second switch. Detailed Implementation

[0035] The following detailed description of an adaptively adjustable power induction heating circuit according to this application, in conjunction with all the accompanying drawings, provides further insight.

[0036] This application discloses an induction heating circuit with adaptively adjustable power.

[0037] Reference Figure 1 An adaptive power-adjustable induction heating circuit includes a sine wave inversion module 1, a temperature measurement module 2, a temperature comparison module 3, an adjustment and control module 4, an induction heating module 5, a signal amplification module 6, an abnormality warning module 7, and a gating switch module 8.

[0038] Reference Figure 1 The sine wave inversion module 1 is used to convert the DC voltage input to the power supply terminal into a sinusoidal AC voltage. In this embodiment, the power supply terminal includes a first power supply and a second power supply, and both the first power supply and the second power supply are connected to the sine wave inversion module 1. The sine wave inversion module 1 provides a sinusoidal AC voltage through the second input node.

[0039] Reference Figure 1 The temperature measurement module 2 is used to detect the temperature of the heated object in real time and generate a temperature signal. In this embodiment, the temperature signal carries a temperature value. The temperature measurement module 2 includes a first resistor and a thermistor, which are connected in series between the selector switch module 8 and ground. The temperature measurement module 2 provides a measurement voltage through a first input node.

[0040] Reference Figure 1The temperature comparison module 3 is used to compare the temperature value with the preset temperature threshold in real time to obtain the comparison result. The temperature comparison module 3 includes a temperature comparator. The inverting input terminal of the temperature comparator is connected to the first input node through a control switch. The non-inverting input terminal of the temperature comparator is connected to the second input node through a second resistor. The output terminal of the temperature comparator is positively fed back to the non-inverting input terminal through a third resistor and a fourth resistor.

[0041] In this embodiment, the temperature threshold is the required temperature that the heated object needs to reach through heating; the comparison results include the heated object's temperature being lower than the required temperature and the heated object's temperature being close to or reaching the required temperature.

[0042] It is important to note that comparators, as crucial electronic devices, are widely used in electronic circuit design. They achieve voltage comparison based on nonlinear equality relationships, thereby converting analog signals into digital signals. Their core structure consists of a comparator, a positive feedback circuit, and a voltage regulator circuit. The positive feedback circuit and voltage regulator circuit are designed to ensure that the comparator outputs digital signals within an accurate range. In practical applications, due to unavoidable manufacturing errors in electronic components and environmental influences, the input voltages of the comparator are not perfectly equal, causing changes in the output level to not reflect the actual input signal in a timely manner. By placing a resistor at the comparator's output, the rate of change of the output level can be effectively reduced, thus slowing down the comparator's response and making it more stable and reliable.

[0043] In this embodiment, the output of the temperature comparator is connected to the non-inverting input in sequence through a third resistor and a fourth resistor to form positive feedback. The main function of these resistors is to prevent circuit oscillation. Simultaneously, the third resistor at the output is used to improve the output stability of the comparator. When the voltage connected to the non-inverting input is higher than the voltage connected to the inverting input, the comparator outputs a high level; when the voltage connected to the non-inverting input is lower than the voltage connected to the inverting input, the comparator outputs a low level. In this embodiment, the effective level state of the output voltage is a high level state, and the ineffective level state is a low level state.

[0044] Reference Figure 1 The adjustment control module 4 is used to generate a control signal for adjusting power based on the comparison result and adjust the sinusoidal AC voltage according to the control signal. The adjustment control module 4 includes a manual submodule 41 and an automatic submodule 42. The manual submodule 41 is used to generate the control signal for adjusting power based on parameters manually input according to the comparison result, and the automatic submodule 42 is used to automatically generate the control signal for adjusting power based on the comparison result. The manual submodule 41 and the automatic submodule 42 can be activated simultaneously and can also be freely switched.

[0045] It should be noted that the control signals generated in the manual submodule 41 have a higher priority than the control signals generated in the automatic submodule 42. Therefore, personnel can adjust the power of the induction heating circuit through the manual submodule 41 at any time when parameters need to be changed. In addition, when personnel are busy, the automatic submodule 42 can realize the automatic adjustment of the induction heating circuit; while when personnel are observing, the induction heating circuit can be manually adjusted through the manual submodule 41 to achieve energy saving.

[0046] In this embodiment, the adjustment control module 4 mainly adjusts the heating power by adjusting the magnitude of the sinusoidal AC voltage in the induction heating circuit. The sinusoidal AC voltage changes according to the temperature change of the heated object detected by the temperature measurement module 2.

[0047] When the comparison result obtained by the temperature comparison module 3 is that the temperature of the heated object is lower than the required temperature, the control signal issued by the adjustment control module 4 is to increase the sinusoidal AC voltage; when the comparison result is that the temperature of the heated object is close to or reaches the required temperature, the control signal issued by the adjustment control module 4 is to maintain or decrease the current sinusoidal AC voltage according to the degree of closeness between the temperature of the heated object and the required temperature.

[0048] Reference Figure 1 The induction heating module 5 is used to heat the object being heated under the action of an adjusted sinusoidal AC voltage.

[0049] Reference Figure 1 The signal amplification module 6 is connected to the temperature measurement module 2 and the temperature comparison module 3 to amplify the amplitude of the temperature signal. As a result, the temperature value information carried in the temperature signal is not easily lost, which improves the accuracy of the induction heating circuit in adjusting the heating power of the circuit according to the temperature value to a certain extent.

[0050] Reference Figure 1 The abnormal warning module 7, connected to the temperature measurement module 2, is used to issue a temperature warning when the temperature value exceeds a preset maximum temperature threshold. The maximum temperature threshold can be manually input; in this embodiment, 100 degrees Celsius is used as an example. In this embodiment, the abnormal warning module 7 primarily uses LEDs to emit light for temperature warning.

[0051] Reference Figure 1A selection switch module 8 is connected between the power supply terminal and the sine wave inverse module 1. The selection switch module 8 includes a first switch 81 and a second switch 82. The control terminal of the first switch 81 is connected to the first power supply, forming a first path; the control terminal of the second switch 82 is connected to the second power supply, forming a second path. The induction heating circuit is controlled by the selection switch module 8 to select and connect to either the first path or the second path. The first path is used to detect the temperature of the heated object in real time through the temperature measurement module 2 and generate a temperature signal; the second path is used to issue a temperature warning through the abnormal warning module 7 when the temperature value exceeds the maximum temperature threshold.

[0052] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An induction heating circuit with adaptively adjustable power, characterized in that, include: The sine wave inverse module (1) is used to convert the DC voltage input at the power supply terminal into a sinusoidal AC voltage; Temperature measurement module (2) is used to detect the temperature of the heated object in real time and generate a temperature signal, the temperature signal carrying a temperature value; The temperature comparison module (3) is used to compare the temperature value with the preset temperature threshold in real time to obtain the comparison result; The adjustment control module (4) is used to generate a control signal for adjusting power based on the comparison result and adjust the sinusoidal AC voltage according to the control signal; The induction heating module (5) is used to heat the object to be heated under the action of the adjusted sinusoidal AC voltage.

2. The induction heating circuit according to claim 1, characterized in that, It also includes a signal amplification module (6), which is connected to the temperature measurement module (2) and the temperature comparison module (3) to amplify the amplitude of the temperature signal.

3. The induction heating circuit according to claim 2, characterized in that, It also includes an abnormal warning module (7), which is connected to the temperature measurement module (2) and is used to issue a temperature warning when the temperature value exceeds the preset maximum temperature threshold.

4. The induction heating circuit according to claim 3, characterized in that, It also includes a gating switch module (8), which is connected between the power supply terminal and the sine wave inverse module (1). The induction heating circuit is controlled by the gating switch module (8) to select to connect the first path or the second path. The first path is used to detect the temperature of the heated object in real time through the temperature measurement module (2) and generate a temperature signal; The second path is used to issue a temperature warning when the temperature value exceeds the maximum temperature threshold via the abnormal warning module (7).

5. The induction heating circuit according to claim 4, characterized in that, The power supply terminal includes a first power supply and a second power supply; the selection switch module (8) includes a first switch (81) and a second switch (82), the control terminal of the first switch (81) is connected to the first power supply to form the first path; the control terminal of the second switch (82) is connected to the second power supply to form the second path; the first power supply and the second power supply are both connected to the sine wave inverse module (1).

6. The induction heating circuit according to claim 4, characterized in that, The temperature measurement module (2) includes a first resistor and a thermistor, and the first resistor (21) and the thermistor (22) are connected in series between the gating switch module (8) and ground.

7. The induction heating circuit according to claim 1, characterized in that, The adjustment control module (4) includes a manual submodule (41) and an automatic submodule (42). The manual submodule (41) is used to generate a control signal for adjusting power based on parameters manually input according to the comparison result. The automatic submodule (42) is used to automatically generate a control signal for adjusting power based on the comparison result.

8. The induction heating circuit according to claim 1, characterized in that, The temperature measurement module (2) provides the measurement voltage through the first input node, and the sine wave inverse module (1) provides the sinusoidal AC voltage through the second input node.

9. The induction heating circuit according to claim 8, characterized in that, The temperature comparison module (3) includes a temperature comparator. The inverting input terminal of the temperature comparator is connected to the first input node through a control switch. The non-inverting input terminal of the temperature comparator is connected to the second input node through a second resistor. The output terminal of the temperature comparator is connected to the non-inverting input terminal in sequence through a third resistor and a fourth resistor.

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