TWI842143B - Switch module with an automatic switching function according to load and method thereof - Google Patents
Switch module with an automatic switching function according to load and method thereof Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 11
- 230000005669 field effect Effects 0.000 claims description 8
- 239000004065 semiconductor Substances 0.000 claims description 6
- 229910044991 metal oxide Inorganic materials 0.000 claims description 4
- 150000004706 metal oxides Chemical class 0.000 claims description 4
- 229910002601 GaN Inorganic materials 0.000 description 10
- 238000010586 diagram Methods 0.000 description 4
- JMASRVWKEDWRBT-UHFFFAOYSA-N Gallium nitride Chemical compound [Ga]#N JMASRVWKEDWRBT-UHFFFAOYSA-N 0.000 description 2
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Description
本發明涉及一種自動切換開關模組,尤指是一種提升電源供應器效率的自動切換開關模組。The present invention relates to an automatic switching switch module, and in particular to an automatic switching switch module for improving the efficiency of a power supply.
當電源供應器因應不同應用需求時,例如不同負載,輸出的效率也會有所不同;又,電源供應器開關在導通及截止之間,會有切換損耗(switching loss)和導通損耗(conduction loss),使得輸出效率變差;據此,如何提升電源供應器的輸出品質和效率,此乃待須解決之問題。When a power supply responds to different application requirements, such as different loads, the output efficiency will also be different. In addition, when the power supply switch is turned on and off, there will be switching loss and conduction loss, which will reduce the output efficiency. Therefore, how to improve the output quality and efficiency of the power supply is a problem that needs to be solved.
有鑒於上述的問題,本發明人係依據多年來從事相關行業的經驗,針對自動切換開關模組進行改進;緣此,本發明之主要目的在於提供一種提升電源供應器的輸出品質和效率的根據負載自動切換開關模組及方法。In view of the above problems, the inventors have made improvements to the automatic switching switch module based on their experience in the relevant industry over the years. Therefore, the main purpose of the present invention is to provide a load-based automatic switching switch module and method that improves the output quality and efficiency of a power supply.
為達上述的目的,本發明之根據負載自動切換開關模組及方法主要藉由一第一比較器和一第二比較器基於一第一電阻和一第二電阻的分壓、及一源極電阻的電壓,自動判斷負載輕重載,並輸出一電壓控制訊號;再藉由複數個電晶體基於前述電壓控制訊號,接收一閘極輸入訊號,並選擇導通一第一開關或一第二開關,其中,第一開關為一氮化鎵場效電晶體(Gallium Nitride Field-Effect Transistor, GaN FET),而第二開關為一金氧半場效電晶體(Metal-Oxide-Semiconductor Field-Effect Transistor, MOSFET)。To achieve the above-mentioned purpose, the load-based automatic switching switch module and method of the present invention mainly uses a first comparator and a second comparator to automatically judge whether the load is light or heavy based on the voltage division of a first resistor and a second resistor and the voltage of a source resistor, and outputs a voltage control signal; then, a plurality of transistors receive a gate input signal based on the aforementioned voltage control signal and select to turn on a first switch or a second switch, wherein the first switch is a gallium nitride field-effect transistor (Gallium Nitride Field-Effect Transistor, GaN FET), and the second switch is a metal-oxide-semiconductor field-effect transistor (Metal-Oxide-Semiconductor Field-Effect Transistor, MOSFET).
當重載時,第一比較器輸出電壓控制訊號給一第一電晶體和一第二電晶體,如此,GaN電晶體可基於外部的一閘極輸入信號,控制本身導通或截止,從而根據GaN切換損耗和導通損耗較小的特性,提升電源供應器重載時的效率;又,當輕載時,第二比較器輸出電壓控制訊號給一第三電晶體和一第四電晶體,如此,MOSFET電晶體可基於外部的閘極輸入信號,控制本身導通或截止,從而根據MOSFET電晶體驅動損失較小的特性,提升電源供應器輕載時的效率。When the load is heavy, the first comparator outputs a voltage control signal to a first transistor and a second transistor, so that the GaN transistor can control itself to be turned on or off based on an external gate input signal, thereby improving the efficiency of the power supply when the load is heavy according to the characteristics of GaN with small switching loss and conduction loss; and when the load is light, the second comparator outputs a voltage control signal to a third transistor and a fourth transistor, so that the MOSFET transistor can control itself to be turned on or off based on an external gate input signal, thereby improving the efficiency of the power supply when the load is light according to the characteristics of the MOSFET transistor with small driving loss.
為使 貴審查委員得以清楚了解本發明之目的、技術特徵及其實施後之功效,茲以下列說明搭配圖示進行說明,敬請參閱。In order to enable you to clearly understand the purpose, technical features and effects of this invention after implementation, the following description is provided with illustrations for your reference.
請參閱「圖1」,係為本發明之電路方塊示意圖,如圖所示,本發明之根據負載自動切換的開關模組可包含一控制電路1、一驅動電路2、一開關電路3、及一源極電阻Rs,上述各電路和元件可整合為晶片,但不以此為限;其中,控制電路1電性連接一電路電壓V
cc和一源極端點S,驅動電路2電性連接一閘極端點G,開關電路3電性連接一汲極端點D,且源極電阻Rs電性連接源極端點S。
Please refer to "Figure 1", which is a schematic diagram of the circuit block of the present invention. As shown in the figure, the switch module of the present invention that automatically switches according to the load may include a
請參閱「圖2」,係為本發明之根據負載自動切換開關模組電路圖,如圖所示,控制電路1包含一第一比較器11、一第二比較器12、一第一電阻R1、及一第二電阻R2,第一比較器11具有一第一反向輸入端、一第一非反向輸入端、及一第一輸出端;又,第二比較器12具有一第二反向輸入端、一第二非反向輸入端、及一第二輸出端,其中,第一電阻R1一端電性連接電路電壓V
cc,另一端電性連接第一反向輸入端、第二非反向輸入端、及第二電阻R2,第二電阻R2另一端電性連接源極端點S和源極電阻Rs,源極電阻Rs另一端電性連接第一非反向輸入端和第二反向輸入端,如此,控制電路1可基於內部電阻的分壓、及外部電阻產生的電壓,自動判斷負載輕重載,從而產生控制訊號。
Please refer to "FIG. 2", which is a circuit diagram of the load automatic switching switch module of the present invention. As shown in the figure, the
請續參閱「圖2」,驅動電路2包含一第一電晶體Tr1、一第二電晶體Tr2、一第三電晶體Tr3、及一第四電晶體Tr4,第一電晶體Tr1和第二電晶體Tr2相互串聯,第一電晶體Tr1的射極電性連接第一輸出端,第一電晶體Tr1的集極電性連接第二電晶體Tr2的集極,第二電晶體Tr2的射極電性連接源極端點S,而第一電晶體Tr1的基極和第二電晶體Tr2的基極電性連接閘極端點G;又,第三電晶體Tr3和第四電晶體Tr4相互串聯,第三電晶體Tr3的射極電性連接第二輸出端,第三電晶體Tr3的集極電性連接第四電晶體Tr4的集極,第四電晶體Tr4的射極電性連接源極端點S,而第三電晶體Tr3的基極和第四電晶體Tr4的基極電性連接閘極端點G,如此,驅動電路2根據控制電路1傳輸的控制訊號,接收閘極端點G輸入的輸入信號,從而驅動開關電路3。Please continue to refer to "Figure 2", the
請續參閱「圖2」,開關電路3包含一第一開關31、及一第二開關32,第一開關31和第二開關32相互並聯,且兩者汲極電性連接汲極端點D,兩者源極電性連接源極電阻Rs,而第一開關31的閘極電性連接第一電晶體Tr1和第二電晶體Tr2的集極,第二開關32的閘極電性連接第三電晶體Tr3和第四電晶體Tr4的集極,其中,第一開關31為一GaN電晶體,第二開關32為一金氧半場效電晶體,如此,開關電路3根據驅動電路2傳輸的驅動訊號,選擇控制第一開關31或第二開關32。Please continue to refer to "Figure 2". The
請參閱「圖3」,係為本發明之根據負載自動切換開關方法流程圖,如圖所示,本發明之根據負載自動切換開關的方法,其步驟如下:Please refer to "FIG. 3", which is a flow chart of the method for automatically switching a switch according to a load of the present invention. As shown in the figure, the method for automatically switching a switch according to a load of the present invention has the following steps:
判斷輕重載S1:控制電路1藉由第一比較器11、第二比較器12,基於電路內部電阻的分壓、及電路外部電阻產生的電壓,自動判斷負載輕重載,並輸出一電壓控制訊號;更進一步細說,內部電阻的分壓係由電路電壓V
cc對第一電阻R1和第二電阻R2進行分壓,控制電路1藉由用第一比較器11和第二比較器12,基於第二電阻R2的分壓和源極電阻Rs所產生的電壓,隨著輕重載的變化,自動選擇由第一輸出端或第二輸出端輸出電壓控制訊號。
Determine whether the load is light or heavy S1: The
切換內部開關S2:驅動電路2藉由第一電晶體Tr1、第二電晶體Tr2、第三電晶體Tr3、及第四電晶體Tr4,基於電壓控制訊號,將自閘極端點G接收的一閘極輸入訊號傳送至開關電路3,以選擇導通第一開關31或第二開關32,其中,第一開關31為GaN電晶體,第二開關32為金氧半場效電晶體。Switching the internal switch S2: The
在一實施例中,當電路整體負載為重載時,源極電阻Rs的電壓大於第二電阻R2的分壓,故第一比較器11輸出電壓控制訊號給第一電晶體Tr1和第二電晶體Tr2,第一開關31(GaN電晶體)因而可接受外部輸入的閘極輸入信號,從而導通或截止,如此,由於GaN電晶體的切換及導通損失較小,因此可提升電路在重載時的效率。In one embodiment, when the circuit is overloaded, the voltage of the source resistor Rs is greater than the voltage divided by the second resistor R2, so the
在一實施例中,當電路整體負載為輕載時,源極電阻Rs的電壓小於第二電阻R2的分壓,故第二比較器12輸出電壓控制訊號給第三電晶體Tr3和第四電晶體Tr4,第二開關32(MOSFET電晶體)因而可接受外部輸入的閘極輸入信號,從而導通或截止,如此,由於MOSFET電晶體的驅動損失較小,因此可提升電路在輕載時的效率。In one embodiment, when the overall load of the circuit is light, the voltage of the source resistor Rs is less than the divided voltage of the second resistor R2, so the
由上所述可知,本發明之根據負載自動切換的開關模組及方法,藉由第一比較器和第二比較器基於第一電阻和第二電阻的分壓、及源極電阻的電壓,自動判斷負載輕重載,並輸出電壓控制訊號;再藉由複數個電晶體基於前述電壓控制訊號,接收閘極輸入訊號以選擇導通GaN電晶體或MOSFET電晶體,如此,在電路輕重載時,可根據不同電晶體的特性,提升電源供應器輕重載時的輸出品質和效率;本發明其據以實施後,確實可以達到提供一種提升電源供應器的輸出品質和效率的根據負載自動切換開關模組及方法之目的。As described above, the switch module and method for automatic switching according to load of the present invention automatically judge whether the load is light or heavy based on the voltage division of the first resistor and the second resistor and the voltage of the source resistor by the first comparator and the second comparator, and output a voltage control signal; then, a plurality of transistors receive a gate input signal based on the aforementioned voltage control signal to select a GaN transistor or a MOSFET transistor to be turned on. In this way, when the circuit is light or heavy loaded, the output quality and efficiency of the power supply under light or heavy load can be improved according to the characteristics of different transistors; after the present invention is implemented, it can indeed achieve the purpose of providing a switch module and method for automatic switching according to load that improves the output quality and efficiency of the power supply.
唯,以上所述者,僅為本發明之較佳之實施例而已,並非用以限定本發明實施之範圍;任何熟習此技藝者,在不脫離本發明之精神與範圍下所作之均等變化與修飾,皆應涵蓋於本發明之專利範圍內。However, the above description is only a preferred embodiment of the present invention and is not intended to limit the scope of the present invention. Any equivalent changes and modifications made by a person skilled in the art without departing from the spirit and scope of the present invention should be included in the patent scope of the present invention.
綜上所述,本發明係具有「產業利用性」、「新穎性」與「進步性」等專利要件;申請人爰依專利法之規定,向 鈞局提起發明專利之申請。In summary, this invention has the patent requirements of "industrial applicability", "novelty" and "progress"; the applicant has filed an application for invention patent with the Jun Bureau in accordance with the provisions of the Patent Law.
1 控制電路 11 第一比較器
12 第二比較器
2 驅動電路
3 開關電路 31 第一開關
32 第二開關
R1 第一電阻 R2 第二電阻
Rs 源極電阻
Tr1 第一電晶體 Tr2 第二電晶體
Tr3 第三電晶體 Tr4 第四電晶體
S 源極端點 G 閘極端點
D 汲極端點
V
cc電路電壓
1
圖1,為本發明之電路方塊示意圖。 圖2,為本發明之根據負載自動切換開關模組電路圖。 圖3,為本發明之根據負載自動切換開關方法流程圖。 Figure 1 is a schematic diagram of the circuit block of the present invention. Figure 2 is a circuit diagram of the switch module that automatically switches according to the load of the present invention. Figure 3 is a flow chart of the method for automatically switching the switch according to the load of the present invention.
11 第一比較器 12 第二比較器
31 第一開關 32 第二開關
R1 第一電阻 R2 第二電阻
Rs 源極電阻
Tr1 第一電晶體 Tr2 第二電晶體
Tr3 第三電晶體 Tr4 第四電晶體
S 源極端點 G 閘極端點
D 汲極端點
V
cc電路電壓
11
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US20220158535A1 (en) | 2019-04-12 | 2022-05-19 | Rohm Co., Ltd. | Linear Power Supply Circuit and Source Follower Circuit |
Patent Citations (1)
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US20220158535A1 (en) | 2019-04-12 | 2022-05-19 | Rohm Co., Ltd. | Linear Power Supply Circuit and Source Follower Circuit |
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