TW201410079A - High-frequency heating apparatus and frequency control method thereof - Google Patents
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本發明係關於一種加熱裝置及其頻率控制方法，特別關於一種高周波加熱裝置及其頻率控制方法。 The present invention relates to a heating device and a frequency control method thereof, and more particularly to a high frequency heating device and a frequency control method thereof.
傳統工業用高周波裝置可產生一交變磁場，進而加熱一導磁物體，然而由於傳統高周波裝置只能固定在某一操作頻率，而無法達到物體之不同深度加熱的效果。若要選擇物體的加熱區段，則需要購買不同頻率範圍的高周波裝置，因而大幅提高成本。 Conventional industrial high-frequency devices can generate an alternating magnetic field and heat a magnetically permeable object. However, since the conventional high-frequency device can only be fixed at a certain operating frequency, the effect of heating at different depths of the object cannot be achieved. To select a heating section of an object, it is necessary to purchase a high-frequency device of a different frequency range, thereby greatly increasing the cost.
此外，習知高周波裝置亦無法達到： In addition, the conventional high frequency device can not reach:
(1)在大電流下，有多頻段的切換。 (1) Under high current, there are multiple frequency bands to switch.
(2)無寬頻操作範圍。 (2) No broadband operating range.
(3)固定頻率加熱。 (3) Fixed frequency heating.
(4)固定電流加熱。 (4) Fixed current heating.
(5)固定溫度加熱。 (5) Heating at a fixed temperature.
因此，如何提供一種高周波加熱裝置及其頻率控制方法，能夠擴充高周波加熱裝置的功能，進而提升其產品競爭力及應用性，實為當前重要課題之一。 Therefore, how to provide a high-frequency heating device and its frequency control method, which can expand the function of the high-frequency heating device, thereby improving its product competitiveness and applicability, is one of the current important topics.
有鑑於上述課題，本發明之目的為提供一種能夠擴充高周波加熱裝置的功能之高周波加熱裝置及其頻率控制 方法。 In view of the above problems, an object of the present invention is to provide a high-frequency heating device capable of expanding the function of a high-frequency heating device and its frequency control method.
為達上述目的，依據本發明之一種高周波加熱裝置包含一數位控制模組、一高周波模組、一高壓電容切換模組、一高頻變壓器以及一線圈模組。數位控制模組輸出一調變訊號。高周波模組依據調變訊號產生一高周波訊號。高壓電容切換模組具有複數電容單元且各電容單元之等效電容係不相同，高壓電容切換模組依據該高周波訊號產生一功率訊號。高頻變壓器依據功率訊號產生一交流驅動訊號。線圈模組與高頻變壓器電性連接，並依據交流驅動訊號產生一交變磁場。 To achieve the above object, a high frequency heating device according to the present invention comprises a digital control module, a high frequency module, a high voltage capacitor switching module, a high frequency transformer and a coil module. The digital control module outputs a modulation signal. The high frequency module generates a high frequency signal based on the modulation signal. The high-voltage capacitor switching module has a plurality of capacitor units and the equivalent capacitances of the capacitor units are different. The high-voltage capacitor switching module generates a power signal according to the high-cycle signal. The high frequency transformer generates an AC drive signal based on the power signal. The coil module is electrically connected to the high frequency transformer and generates an alternating magnetic field according to the alternating current driving signal.
在一實施例中，高周波加熱裝置更包含一切換單元，其與高壓電容切換模組耦接以切換該等電容單元。 In one embodiment, the high-frequency heating device further includes a switching unit coupled to the high-voltage capacitor switching module to switch the capacitor units.
在一實施例中，高周波模組包含一全橋電路。 In one embodiment, the high frequency module includes a full bridge circuit.
在一實施例中，調變訊號為一責任週期控制訊號、一頻率控制訊號或一電壓控制訊號。 In one embodiment, the modulation signal is a duty cycle control signal, a frequency control signal, or a voltage control signal.
在一實施例中，高周波加熱裝置更包含一感測單元，其係與數位控制模組及高頻變壓器電性連接，並感測一電流或一頻率。 In one embodiment, the high-frequency heating device further includes a sensing unit electrically connected to the digital control module and the high-frequency transformer, and sensing a current or a frequency.
在一實施例中，高周波加熱裝置更包含另一感測單元，係與該數位控制模組電性連接，並感測一溫度。 In one embodiment, the high-frequency heating device further includes another sensing unit electrically connected to the digital control module and sensing a temperature.
為達上述目的，本發明亦揭露一種頻率控制方法，其係應用於如上所述之高周波加熱裝置，並包含：一掃頻步驟，以取得對應其中一電容單元之一頻率範圍；一第一比較步驟，比較一輸入值與一偵測值；依據第一比較步驟之 結果決定是否進行一第二比較步驟，第二比較步驟包含判斷偵測值或偵測值所對應的頻率是否落在頻率範圍內；依據第二比較步驟之結果決定是否進行一誤差分布計算；以及依據誤差分布計算決定是否調整一調變訊號以調整頻率範圍。 In order to achieve the above object, the present invention also discloses a frequency control method, which is applied to the high-frequency heating device as described above, and includes: a frequency sweeping step to obtain a frequency range corresponding to one of the capacitor units; a first comparison step Comparing an input value with a detection value; according to the first comparison step The result determines whether to perform a second comparison step, the second comparing step includes determining whether the frequency corresponding to the detected value or the detected value falls within the frequency range; determining whether to perform an error distribution calculation according to the result of the second comparing step; According to the error distribution calculation, it is determined whether to adjust a modulation signal to adjust the frequency range.
在一實施例中，掃頻步驟之掃頻方向係由高頻至低頻。 In one embodiment, the sweeping direction of the sweeping step is from high frequency to low frequency.
在一實施例中，輸入值包含一頻率值、一溫度值、或一電流值。 In an embodiment, the input value comprises a frequency value, a temperature value, or a current value.
在一實施例中，若第二比較步驟之結果為是，則將調變訊號之頻率調高一增加值。增加值例如為1kHz。 In one embodiment, if the result of the second comparison step is YES, the frequency of the modulation signal is increased by an increased value. The added value is, for example, 1 kHz.
在一實施例中，誤差分布計算係包含：對偵測值進行一預設量的取樣；以及若該等取樣的偵測值或其對應的頻率落在頻率範圍之上達一預設比例，則調高該調變訊號之一責任週期。 In an embodiment, the error distribution calculation includes: performing a predetermined amount of sampling on the detected value; and if the detected value of the sample or the corresponding frequency falls above a frequency range by a predetermined ratio, Increase the duty cycle of one of the modulation signals.
在一實施例中，誤差分布計算係包含：對偵測值進行一預設量的取樣；若該等取樣的偵測值或其對應的頻率落在頻率範圍之下達一預設比例時，則調低該調變訊號之一責任週期。 In an embodiment, the error distribution calculation includes: performing a predetermined amount of sampling on the detected value; if the detected value of the sample or the corresponding frequency falls below a frequency range by a predetermined ratio, Reduce the duty cycle of one of the modulation signals.
承上所述，在本發明之高周波加熱裝置及其頻率控制方法中，高壓電容切換模組具有複數不同等效電容之電容單元，進而能達到多頻段切換與寬頻操作範圍，並可藉此產生不同的功率訊號，以驅動線圈模組產生不同頻率的交變磁場，藉此能控制一物體的加熱深度，進而增加產品應 用性。此外，本發明之高周波加熱裝置可讓使用者輸入一輸入值，且輸入值可與一偵測值比較而進行回授控制，輸入值可以是電流、溫度或頻率，進而達到定電流、定溫或定頻之控制。此外，本發明之頻率控制方法能藉由一誤差分布計算調整一頻率範圍，進而能達到精準的控制。 As described above, in the high-frequency heating device and the frequency control method thereof, the high-voltage capacitor switching module has a plurality of capacitor units with different equivalent capacitances, thereby achieving multi-band switching and wide-band operation range, and thereby generating Different power signals are used to drive the coil module to generate alternating magnetic fields of different frequencies, thereby controlling the heating depth of an object, thereby increasing the product Use sex. In addition, the high-frequency heating device of the present invention allows the user to input an input value, and the input value can be compared with a detected value for feedback control, and the input value can be current, temperature or frequency, thereby achieving constant current and constant temperature. Or the control of fixed frequency. In addition, the frequency control method of the present invention can adjust a frequency range by an error distribution calculation, thereby achieving precise control.
以下將參照相關圖式，說明依本發明較佳實施例之一種高周波加熱裝置及其頻率控制方法，其中相同的元件將以相同的參照符號加以說明。 DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a high-frequency heating device and a frequency control method thereof according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings, wherein the same elements will be described with the same reference numerals.
圖1為本發明較佳實施例之一種高周波加熱裝置1的方塊示意圖，其中，高周波加熱裝置1包含一數位控制模組11、一高周波模組12、一高壓電容切換模組13、一高頻變壓器14以及一線圈模組15。高周波加熱裝置1可應用於工程領域、醫療領域、或其他領域之加熱應用。例如，當應用於醫療領域時，可與一電磁熱治療針(electromagnetic thermotherapy needle)配合使用；高周波加熱裝置1產生一交變磁場，以致***一患病組織內之電磁熱治療針產生一渦電流而發熱，進而燒灼患病組織而達到治療之效。由於本實施例之高周波加熱裝置1可產生不同的頻率的交變磁場，故可控制加熱的深度；其中，當高頻時可產生淺層磁場，當低頻時可產生深層磁場，而決定不同的加熱深度。 1 is a block diagram of a high-frequency heating device 1 according to a preferred embodiment of the present invention. The high-frequency heating device 1 includes a digital control module 11, a high-frequency module 12, a high-voltage capacitor switching module 13, and a high frequency. Transformer 14 and a coil module 15. The high-frequency heating device 1 can be applied to heating applications in the engineering field, the medical field, or other fields. For example, when applied to the medical field, it can be used in conjunction with an electromagnetic thermotherapy needle; the high-frequency heating device 1 generates an alternating magnetic field, so that an electromagnetic heat treatment needle inserted into a diseased tissue generates an eddy current. The fever, and then burn the diseased tissue to achieve therapeutic effects. Since the high-frequency heating device 1 of the present embodiment can generate an alternating magnetic field of different frequencies, the depth of heating can be controlled; wherein, when the high frequency is high, a shallow magnetic field can be generated, and when the low frequency is generated, a deep magnetic field can be generated, and the difference is determined. Heating depth.
數位控制模組11係輸出一調變訊號SM。數位控制模 組11可由一數位訊號處理器(digital signal processing,DSP)來實現。數位控制模組11所輸出的調變訊號SM可例如為一責任週期控制訊號、一頻率控制訊號或一電壓控制訊號，亦即藉由不同的責任週期、頻率或電壓來控制調變訊號SM的強度。 The digital control module 11 outputs a modulation signal S M . The digital control module 11 can be implemented by a digital signal processing (DSP). The modulation signal S M outputted by the digital control module 11 can be, for example, a duty cycle control signal, a frequency control signal or a voltage control signal, that is, the modulation signal S is controlled by different duty cycles, frequencies or voltages. The strength of M.
高周波模組12與數位控制模組11電性連接並依據調變訊號SM產生一高周波訊號SHF。高周波模組12可包含一全橋電路，其包含複數電晶體開關元件，並藉由調變訊號SM對該等電晶體開關元件進行切換而產生高周波訊號SHF。高周波訊號SHF相對而言為高壓低電流之訊號。 The high-frequency module 12 is electrically connected to the digital control module 11 and generates a high-cycle signal S HF according to the modulation signal S M . The high-frequency module 12 can include a full-bridge circuit including a plurality of transistor switching elements, and switching the transistor switching elements by the modulation signal S M to generate a high-cycle signal S HF . The high frequency signal S HF is relatively high voltage and low current signal.
高壓電容切換模組13具有複數電容單元131，且各電容單元131之等效電容係不相同。高壓電容切換模組13與高周波模組12電性連接並依據高周波訊號SHF產生一功率訊號SP。另外，本實施例之高周波加熱裝置1可更包含一切換單元16，其係與高壓電容切換模組13耦接以切換該等電容單元131接收高周波訊號SHF。藉由切換單元16切換具有不同電容值之電容單元131，可使本實施例之高周波加熱裝置1達到多頻段切換以及在中高頻段，例如30k~300kHz之寬頻操作範圍。圖2為本實施例之高周波加熱裝置1之多頻段之寬頻操作範圍的示意圖。於此係以6個電容單元131為例，故可達到6頻段切換效能，且操作範圍從30k至300kHz。由於本實施例屬串聯諧振，故皆操作在各頻段之右半平面。 The high-voltage capacitor switching module 13 has a plurality of capacitor units 131, and the equivalent capacitances of the capacitor units 131 are different. The high-voltage capacitor switching module 13 is electrically connected to the high-frequency module 12 and generates a power signal S P according to the high-cycle signal S HF . In addition, the high-frequency heating device 1 of the present embodiment may further include a switching unit 16 coupled to the high-voltage capacitor switching module 13 to switch the capacitor units 131 to receive the high-cycle signal S HF . By switching the capacitor unit 131 having different capacitance values by the switching unit 16, the high-frequency heating device 1 of the present embodiment can achieve multi-band switching and a wide-band operating range in the middle-high frequency band, for example, 30k to 300 kHz. FIG. 2 is a schematic diagram showing the wide frequency operation range of the multi-band of the high-frequency heating device 1 of the present embodiment. In this case, the six capacitor units 131 are taken as an example, so that the 6-band switching performance can be achieved, and the operation range is from 30k to 300kHz. Since this embodiment is a series resonance, it operates in the right half plane of each frequency band.
高頻變壓器14與高壓電容切換模組13電性連接，並 依據功率訊號SP產生一交流驅動訊號SA。本實施例不限制高頻變壓器14所輸出之交流驅動訊號SA之範圍，其可依據實際需求而改變。相對而言，交流驅動訊號SA為低壓高電流之訊號。 The high frequency transformer 14 is electrically connected to the high voltage capacitor switching module 13 and generates an AC driving signal S A according to the power signal S P . This embodiment does not limit the range of the AC drive signal S A outputted by the high frequency transformer 14, which may be changed according to actual needs. Relatively speaking, the AC drive signal S A is a low voltage and high current signal.
線圈模組15與高頻變壓器14電性連接，並依據交流驅動訊號SA產生一交變磁場MA。本實施例不限制線圈模組15之線圈的種類、數量及結構，這些皆可依實際需求而改變。 Coil module 15 is electrically connected to the high frequency transformer 14, and S A according to AC driving signal to produce an alternating magnetic field M A. This embodiment does not limit the type, number, and structure of the coils of the coil module 15, and these may be changed according to actual needs.
此外，本實施例之高周波加熱裝置1可更包含一感測單元17，其係與數位控制模組11及高頻變壓器14電性連接，並可例如感測一電流、一頻率或其組合。另外，本實施例之高周波加熱裝置1可更包含另一感測單元18，其係與數位控制模組11電性連接，並感測一溫度，例如感測高周波加熱裝置1所加熱之一加熱體之溫度，並可將具有溫度資訊之偵測值回傳至數位控制模組11以進行回授控制，而達到定溫控制目的。當然，高周波加熱裝置1可同時包含感測單元17、18或僅包含二者之其中之一。 In addition, the high-frequency heating device 1 of the present embodiment may further include a sensing unit 17 electrically connected to the digital control module 11 and the high-frequency transformer 14, and may, for example, sense a current, a frequency, or a combination thereof. In addition, the high-frequency heating device 1 of the present embodiment may further include another sensing unit 18 electrically connected to the digital control module 11 and sensing a temperature, for example, sensing one of the heating of the high-frequency heating device 1 The temperature of the body, and the detected value with temperature information can be transmitted back to the digital control module 11 for feedback control to achieve the purpose of constant temperature control. Of course, the high-frequency heating device 1 can contain both the sensing unit 17, 18 or only one of them.
其中，感測單元17所包含之電流及頻率感測元件例如為霍爾元件或是電阻式電路，而感測單元18所包含之溫度感測元件例如為熱電耦或熱敏電阻。於此，感測單元17係與高頻變壓器14之二次側電性連接為例，且其所感測到之一偵測值係回傳至數位控制模組11，以進行回授控制。藉由感測單元17、18所造成的回授控制可使高周波加熱裝置1具有定電流、定溫或定頻之控制。感測單元17 可包含一A/D轉換器(Analog to Digital Converter)以將偵測值數位化傳送至數位控制模組11。 The current and frequency sensing component included in the sensing unit 17 is, for example, a Hall component or a resistive circuit, and the temperature sensing component included in the sensing unit 18 is, for example, a thermocouple or a thermistor. Here, the sensing unit 17 is electrically connected to the secondary side of the high-frequency transformer 14, and one of the detected values is returned to the digital control module 11 for feedback control. The feedback control by the sensing units 17, 18 enables the high-frequency heating device 1 to have constant current, constant temperature or fixed frequency control. Sensing unit 17 An A/D converter (Analog to Digital Converter) may be included to digitally transmit the detected value to the digital control module 11.
圖3為本發明較佳實施例之一種頻率控制方法的流程圖，其係應用於如上所述之高周波加熱裝置1。 3 is a flow chart of a frequency control method according to a preferred embodiment of the present invention, which is applied to the high-frequency heating device 1 as described above.
首先，頻率控制方法包含一掃頻步驟S101，其係取得對應其中一電容單元之一頻率範圍。當使用者一開始使用高周波加熱裝置1時，必會切換或使用一電容單元，而該電容單元具有一較佳之操作頻率範圍，故先藉由一掃頻步驟以取得對應該電容單元之該頻率範圍。於此，頻率範圍例如：當較佳的操作頻率為f時，則頻率範圍為fL與fH之間，fL=f-1kHz，fH=f+1kHz。藉由掃頻步驟，可使高周波加熱裝置1能快速並穩定開機，由於系統不可操作於共振頻率的左半平面一電容性負載，因此掃頻範圍是由高頻往低頻(例如從300kHz往下掃頻)進行掃描偵測；此法可使系統操作於共振頻率的右半平面一電感性負載，藉此避免系統操作於諧振點及電容性時產生之錯誤。 First, the frequency control method includes a frequency sweeping step S101, which is performed to obtain a frequency range corresponding to one of the capacitor units. When the user initially uses the high-frequency heating device 1, the capacitor unit must be switched or used, and the capacitor unit has a preferred operating frequency range. Therefore, a frequency sweeping step is first used to obtain the frequency range corresponding to the capacitor unit. . Here, the frequency range is, for example, when the preferred operating frequency is f, then the frequency range is between f L and f H , f L = f-1 kHz, f H = f + 1 kHz. By means of the frequency sweeping step, the high-frequency heating device 1 can be quickly and stably turned on. Since the system is incapable of operating a capacitive load in the left half plane of the resonant frequency, the sweep frequency range is from high frequency to low frequency (for example, from 300 kHz down). Sweep) scan detection; this method allows the system to operate on the right half of the resonant frequency, an inductive load, thereby avoiding errors in the system operating at the resonance point and capacitance.
然後，頻率控制方法包含一第一比較步驟S102，其係比較一輸入值與一偵測值。輸入值係由使用者所輸入的值，其可例如包含一頻率值、一溫度值、或一電流值，可分別依據定頻控制、定溫控制或定電流控制之需求而輸入。在本實施例中係以輸入值為電流值為例。而偵測值係藉由感測單元17所偵測的值，其亦可包含一頻率值或一電流值以對應輸入值。於此，當輸入值與偵測值(以電流值為例)相等時，則可穩定輸出交流驅動訊號SA進而產生 所需要的交變磁場MA，而此交變磁場MA可導致固定的電流產生於所要加熱的加熱體上，而達到定電流控制。同樣的原則可應用於定溫及定頻控制，於此不再贅述。 Then, the frequency control method includes a first comparison step S102, which compares an input value with a detection value. The input value is a value input by the user, and may include, for example, a frequency value, a temperature value, or a current value, which may be input according to requirements of fixed frequency control, constant temperature control, or constant current control, respectively. In the present embodiment, the input value is a current value. The detected value is a value detected by the sensing unit 17, and may also include a frequency value or a current value to correspond to the input value. In this case, when the input value is equal to the detected value (for example, the current value), the AC drive signal S A can be stably outputted to generate the required alternating magnetic field M A , and the alternating magnetic field M A can cause the fixed The current is generated on the heating body to be heated to achieve constant current control. The same principle can be applied to constant temperature and fixed frequency control, and will not be described here.
若第一比較步驟之結果為否，即偵測值實質不等於輸入值，則進行一第二比較步驟S103，其係包含判斷偵測值或偵測值所對應的頻率是否落在頻率範圍內。若第二比較步驟S103之結果為是，則將調變訊號SM之頻率調高一增加值(步驟S104)，再進行第一比較步驟S102。增加值例如但不限於1kHz。由於調變訊號SM改變了，故感測單元17所感測的偵測值及偵測值所對應的頻率f亦改變，並使得頻率範圍fL~fH亦隨之改變。 If the result of the first comparison step is no, that is, the detection value is not substantially equal to the input value, then a second comparison step S103 is performed, which includes determining whether the frequency corresponding to the detection value or the detection value falls within the frequency range. . If the result of the second comparison step S103 is YES, the frequency of the modulation signal S M is increased by an increase value (step S104), and the first comparison step S102 is performed. The added value is for example but not limited to 1 kHz. Since the modulation signal S M is changed, the detected value and the detected frequency f of the sensing unit 17 also change, and the frequency range f L ~f H also changes.
接著，若第二比較步驟之結果為否，即偵測值所對應的頻率不落在頻率範圍內，則決定進行一誤差分布計算S105。 Then, if the result of the second comparison step is no, that is, the frequency corresponding to the detected value does not fall within the frequency range, then an error distribution calculation S105 is determined.
誤差分布計算係包含：對偵測值進行一預設量的取樣；若該等取樣的偵測值或其對應的頻率落在該頻率範圍fL~fH之上達一預設比例，則調高該調變訊號之一責任週期(步驟S106)；以及若該等取樣的偵測值或其對應的頻率落在該頻率範圍fL~fH之下達一預設比例時，則調低該調變訊號之一責任週期(步驟S107)。於此，預設量例如為100或其他數字。圖4A及圖4B為誤差分布計算的示意圖。請參照圖4A所示，若該等取樣的偵測值或其對應的頻率落在該頻率範圍fL~fH之下達一預設比例(例如但不限於70%)，則調低該調變訊號之一責任週期。就物理意 義來說，取樣的偵測值或其對應的頻率落在該頻率範圍fL~fH之下代表電流太大，所以調低該調變訊號之一責任週期，以使電流變小。 The error distribution calculation includes: performing a predetermined amount of sampling on the detected value; if the detected value of the sample or its corresponding frequency falls within the frequency range f L ~f H by a predetermined ratio, then adjusting Increasing one of the duty cycle of the modulation signal (step S106); and if the detected value of the sample or its corresponding frequency falls below the frequency range f L ~f H by a predetermined ratio, then lowering the One of the duty cycle of the modulation signal (step S107). Here, the preset amount is, for example, 100 or other numbers. 4A and 4B are schematic diagrams of error distribution calculation. Referring to FIG. 4A, if the detected values of the samples or their corresponding frequencies fall below the frequency range f L ~f H by a predetermined ratio (for example, but not limited to 70%), the adjustment is lowered. One of the duty cycle of the change signal. In the physical sense, the detected value of the sample or its corresponding frequency falls below the frequency range f L ~ f H to indicate that the current is too large, so the duty cycle of one of the modulation signals is lowered to make the current smaller. .
請參照圖4B所示，若該等取樣的偵測值或其對應的頻率落在該頻率範圍fL~fH之上達一預設比例(例如但不限於70%)，則調高該調變訊號之一責任週期。就物理意義來說，取樣的偵測值或其對應的頻率落在該頻率範圍fL~fH之上代表電流太小，所以調高該調變訊號之一責任週期，以使電流變大。當然，藉由上述調變訊號的調整，亦使得頻率範圍改變。 Referring to FIG. 4B, if the detected values of the samples or their corresponding frequencies fall within the frequency range f L ~f H by a predetermined ratio (for example, but not limited to 70%), the adjustment is raised. One of the duty cycle of the change signal. In the physical sense, the detected value of the sample or its corresponding frequency falling within the frequency range f L ~ f H represents that the current is too small, so the duty cycle of one of the modulation signals is increased to increase the current. . Of course, the frequency range is also changed by the adjustment of the above-mentioned modulation signal.
在調高或調低調變訊號之後，再進行第一比較步驟S102。 After the modulation signal is turned up or down, the first comparison step S102 is performed.
若該等取樣的偵測值或其對應的頻率落在該頻率範圍fL~fH內達一預設比例(即誤差未超出範圍)，則再次改變調變訊號，例如將調變訊號SM之頻率調高一增加值(步驟S104)。 If the detected values of the samples or their corresponding frequencies fall within the frequency range f L ~f H by a predetermined ratio (ie, the error does not exceed the range), then the modulation signal is changed again, for example, the modulation signal S The frequency of M is increased by an added value (step S104).
依據上述，誤差分布計算S105所導致的頻率範圍調整可視為一粗調，而改變調變訊號S104可視為一微調。藉此可使本發明之頻率控制方法能精準地達到定溫、定電流或定頻之控制。 According to the above, the frequency range adjustment caused by the error distribution calculation S105 can be regarded as a coarse adjustment, and the change modulation signal S104 can be regarded as a fine adjustment. Thereby, the frequency control method of the present invention can accurately achieve the control of constant temperature, constant current or fixed frequency.
綜上所述，在本發明之高周波加熱裝置及其頻率控制方法中，高壓電容切換模組具有複數不同等效電容之電容單元，進而能達到多頻段切換與寬頻操作範圍，並可藉此產生不同的功率訊號，以驅動線圈模組產生不同頻率的交 變磁場，藉此能控制一物體的加熱深度，進而增加產品應用性。此外，本發明之高周波加熱裝置可讓使用者輸入一輸入值，且輸入值可與一偵測值比較而進行回授控制，輸入值可以是電流、溫度或頻率，進而達到定電流、定溫或定頻之控制。此外，本發明之頻率控制方法能藉由一誤差分布計算調整一頻率範圍，進而能達到精準的控制。 In summary, in the high-frequency heating device and the frequency control method thereof, the high-voltage capacitor switching module has a plurality of capacitor units with different equivalent capacitances, thereby achieving multi-band switching and wide-band operation range, and thereby generating Different power signals to drive the coil module to produce different frequencies The magnetic field is changed, thereby controlling the heating depth of an object, thereby increasing product applicability. In addition, the high-frequency heating device of the present invention allows the user to input an input value, and the input value can be compared with a detected value for feedback control, and the input value can be current, temperature or frequency, thereby achieving constant current and constant temperature. Or the control of fixed frequency. In addition, the frequency control method of the present invention can adjust a frequency range by an error distribution calculation, thereby achieving precise control.
以上所述僅為舉例性，而非為限制性者。任何未脫離本發明之精神與範疇，而對其進行之等效修改或變更，均應包含於後附之申請專利範圍中。 The above is intended to be illustrative only and not limiting. Any equivalent modifications or alterations to the spirit and scope of the invention are intended to be included in the scope of the appended claims.
1‧‧‧高周波加熱裝置 1‧‧‧High frequency heating device
11‧‧‧數位控制模組 11‧‧‧Digital Control Module
12‧‧‧高周波模組 12‧‧‧High Frequency Module
13‧‧‧高壓電容切換模組 13‧‧‧High Voltage Capacitor Switching Module
131‧‧‧電容單元 131‧‧‧Capacitor unit
14‧‧‧高頻變壓器 14‧‧‧High frequency transformer
15‧‧‧線圈模組 15‧‧‧ coil module
16‧‧‧切換單元 16‧‧‧Switch unit
17、18‧‧‧感測單元 17, 18‧‧‧ Sensing unit
MA‧‧‧交變磁場 M A ‧‧‧ alternating magnetic field
SA‧‧‧交流驅動訊號 S A ‧‧‧AC drive signal
SHF‧‧‧高周波訊號 S HF ‧‧‧High Frequency Signal
SM‧‧‧調變訊號 S M ‧‧‧ modulated signal
SP‧‧‧功率訊號 S P ‧‧‧Power signal
S101~S107‧‧‧頻率控制方法的步驟 Steps of the S101~S107‧‧‧ frequency control method
圖1為本發明較佳實施例之一種高周波加熱裝置的方塊示意圖；圖2為本發明較佳實施例之高周波加熱裝置之多頻段之寬頻操作範圍的示意圖；圖3為本發明較佳實施例之一種頻率控制方法的流程圖；以及圖4A及圖4B為本發明較佳實施例之誤差分布計算的示意圖。 1 is a block diagram of a high-frequency heating device according to a preferred embodiment of the present invention; FIG. 2 is a schematic diagram showing a wide-band operating range of a multi-band of a high-frequency heating device according to a preferred embodiment of the present invention; FIG. 3 is a preferred embodiment of the present invention. A flowchart of a frequency control method; and FIGS. 4A and 4B are schematic diagrams of error distribution calculations in accordance with a preferred embodiment of the present invention.
1‧‧‧高周波加熱裝置 1‧‧‧High frequency heating device
11‧‧‧數位控制模組 11‧‧‧Digital Control Module
12‧‧‧高周波模組 12‧‧‧High Frequency Module
13‧‧‧高壓電容切換模組 13‧‧‧High Voltage Capacitor Switching Module
131‧‧‧電容單元 131‧‧‧Capacitor unit
14‧‧‧高頻變壓器 14‧‧‧High frequency transformer
15‧‧‧線圈模組 15‧‧‧ coil module
16‧‧‧切換單元 16‧‧‧Switch unit
17、18‧‧‧感測單元 17, 18‧‧‧ Sensing unit
MA‧‧‧交變磁場 M A ‧‧‧ alternating magnetic field
SA‧‧‧交流驅動訊號 S A ‧‧‧AC drive signal
SHF‧‧‧高周波訊號 S HF ‧‧‧High Frequency Signal
SM‧‧‧調變訊號 S M ‧‧‧ modulated signal
SP‧‧‧功率訊號 S P ‧‧‧Power signal
Claims (13)
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| TWI615169B (en) * | 2016-11-16 | 2018-02-21 | 財團法人金屬工業研究發展中心 | Electromagnetic thermotherapy estimation system and electromagnetic thermotherapy estimation method |
| TWI625070B (en) * | 2016-12-22 | 2018-05-21 | Prec Machinery Research&Development Center | Induction heating frequency adjustment device |
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| CN107442923A (en) * | 2017-04-01 | 2017-12-08 | 上海浦雄实业有限公司 | A kind of current control system of high-frequency welding equipment |
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| KR940004040B1 (en) * | 1991-10-24 | 1994-05-11 | 주식회사 금성사 | Load testing circuit of induction heating cooker |
| CN1220898A (en) * | 1997-12-25 | 1999-06-30 | 白善信 | Thermal electromagnetic therapeutic instrument |
| JPH11224769A (en) * | 1998-02-06 | 1999-08-17 | Hitachi Hometec Ltd | High-frequency heating device |
| JP3772071B2 (en) * | 2000-05-12 | 2006-05-10 | 株式会社リコー | Fixing device using inverter circuit for induction heating |
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