KR-102962514-B1 - SWITCHED CAPACITOR VOLTAGE CONVERTER

KR102962514B1KR 102962514 B1KR102962514 B1KR 102962514B1KR-102962514-B1

Abstract

The present application relates to the field of electronic circuit technology and discloses a switched capacitor voltage converter comprising a loop regulator module, a clamping transistor, and a clamping circuit, wherein the loop regulator module monitors electrical parameters of an input terminal and an output terminal and outputs a voltage to the gate terminal of the clamping transistor according to the electrical parameters so that the voltage value of the output terminal is maintained at a target value, and the clamping circuit causes the voltage difference between the drain terminal and the source terminal of the clamping transistor to be smaller than the withstand voltage value of the clamping transistor. The present application reduces costs by reducing the area of the transistor while lowering the withstand voltage value of the clamping transistor by connecting a clamping circuit to both ends of the clamping transistor, thereby making the voltage difference between the drain terminal and the source terminal of the clamping transistor smaller than the withstand voltage value of the clamping transistor.

Inventors

자오 웨이

Assignees

사우스칩 세미컨덕터 테크놀로지 (상하이) 씨오., 엘티디.

Dates

Publication Date: 20260507
Application Date: 20230811
Priority Date: 20221124

Claims (15)

In a switched capacitor voltage converter, It includes a loop regulator module, a clamping transistor, and a clamping circuit, The gate terminal of the clamping transistor is connected to the voltage output terminal of the loop regulator module, the drain terminal of the clamping transistor is connected to the input terminal of the switched capacitor voltage converter, the source terminal of the clamping transistor is connected to the reference terminal of the switched capacitor voltage converter, and the clamping circuit is connected between the source terminal and the drain terminal of the clamping transistor. The loop regulator module monitors the electrical parameters of the input terminal of the switched capacitor voltage converter and the output terminal of the switched capacitor voltage converter, and outputs a voltage to the gate terminal of the clamping transistor according to the electrical parameters so that the voltage value of the output terminal is maintained at a target value. The clamping circuit above ensures that the voltage difference between the drain terminal and the source terminal of the clamping transistor is less than or equal to the withstand voltage value of the clamping transistor, and The clamping circuit above includes a first resistor, a first gate control element, a first diode, and a first transistor, and The negative electrode of the first gate control element is connected to the drain terminal of the clamping transistor, and the positive electrode of the first gate control element is connected to the source terminal of the clamping transistor through the first resistor. A switched capacitor voltage converter characterized in that the positive terminal of the first diode is connected to the drain terminal of the clamping transistor, the negative terminal of the first diode is connected to the drain terminal of the first transistor, the source terminal of the first transistor is connected to the gate terminal of the clamping transistor, and the gate terminal of the first transistor is connected to the positive terminal of the first gate control element.
In Article 1, A switched capacitor voltage converter characterized in that the first gate control element is a Zener diode, a diode connected in series, or a transistor connected in series.
In paragraph 1, The first gate control element is n transistors connected in series, n≥2, and n is a positive integer, A switched capacitor voltage converter characterized in that the drain terminal and gate terminal of the first transistor are both connected to the drain terminal of the clamping transistor, the source terminal of the previous transistor is connected to the drain terminal and gate terminal of the next transistor, the source terminal of the nth transistor is connected to the first resistor, and the previous transistor is any transistor among the n transistors excluding the nth transistor.
In Article 1, The first gate control element is n diodes connected in series, n≥2, and n is a positive integer, A switched capacitor voltage converter characterized in that the positive terminal of the first diode is connected to the drain terminal of the clamping transistor, the negative terminal of the previous diode is connected to the positive terminal of the next diode, the negative terminal of the nth diode is connected to the first resistor, and the previous diode is any diode among the n diodes excluding the nth diode.
In a switched capacitor voltage converter, It includes a loop regulator module, a clamping transistor, and a clamping circuit, The gate terminal of the clamping transistor is connected to the voltage output terminal of the loop regulator module, the drain terminal of the clamping transistor is connected to the input terminal of the switched capacitor voltage converter, the source terminal of the clamping transistor is connected to the reference terminal of the switched capacitor voltage converter, and the clamping circuit is connected between the source terminal and the drain terminal of the clamping transistor. The loop regulator module monitors the electrical parameters of the input terminal of the switched capacitor voltage converter and the output terminal of the switched capacitor voltage converter, and outputs a voltage to the gate terminal of the clamping transistor according to the electrical parameters so that the voltage value of the output terminal is maintained at a target value. The clamping circuit above ensures that the voltage difference between the drain terminal and the source terminal of the clamping transistor is less than or equal to the withstand voltage value of the clamping transistor, and The clamping circuit above includes a second resistor, a second gate control element, a second diode, and a second transistor, and The positive electrode of the second gate control element is connected to the source terminal of the clamping transistor, and the negative electrode of the second gate control element is connected to the drain terminal of the clamping transistor through the second resistor. A switched capacitor voltage converter characterized in that the negative terminal of the second diode is connected to the gate terminal of the clamping transistor, the positive terminal of the second diode is connected to the drain terminal of the second transistor, the source terminal of the second transistor is connected to the drain terminal of the clamping transistor, and the gate terminal of the second transistor is connected to the negative terminal of the second gate control element.
In Article 5, A switched capacitor voltage converter characterized in that the second gate control element is a Zener diode, a diode connected in series, or a transistor connected in series.
In Article 5, The second gate control element is n transistors connected in series, n≥2, and n is a positive integer, A switched capacitor voltage converter characterized in that the source terminals of the first transistor are all connected to the second resistor, the drain terminal and gate terminal of the previous transistor are all connected to the source terminal of the next transistor, the drain terminal and gate terminal of the nth transistor are all connected to the source terminal of the clamping transistor, and the previous transistor is any transistor among the n transistors excluding the nth transistor.
In Article 5, The second gate control element is n diodes connected in series, n≥2, and n is a positive integer, A switched capacitor voltage converter characterized in that the positive terminal of the first diode is connected to the second resistor, the negative terminal of the previous diode is connected to the positive terminal of the next diode, the negative terminal of the nth diode is connected to the source terminal of the clamping transistor, and the previous diode is any diode among the n diodes excluding the nth diode.
In any one of paragraphs 1 through 8, A switched capacitor voltage converter further comprising a switched capacitor voltage conversion circuit connected between the reference terminal and the output terminal, wherein the reference terminal is an input terminal of the switched capacitor voltage conversion circuit.
In Article 9, A switched capacitor voltage converter characterized in that the above switched capacitor voltage conversion circuit is a dual switched capacitor voltage conversion circuit with a ratio of 2:1.
In Article 10, The above switched capacitor voltage conversion circuit includes a first branch circuit, one end of which is connected to the reference terminal and the other end of which is grounded, and a second branch circuit, one end of which is connected to the reference terminal and the other end of which is grounded. The first branch circuit comprises a first switched capacitor and, in order, a first switching transistor, a second switching transistor, a third switching transistor, and a fourth switching transistor connected in series, wherein the second switching transistor and the third switching transistor connected in series are connected in parallel with the first switched capacitor, and the second branch circuit comprises a second switched capacitor and, in order, a fifth switching transistor, a sixth switching transistor, a seventh switching transistor, and an eighth switching transistor connected in series, wherein the sixth switching transistor and the seventh switching transistor connected in series are connected in parallel with the second switched capacitor. A switched capacitor voltage converter characterized in that the first connection point of the first branch circuit and the second connection point of the second branch circuit are both connected to the output terminal, the first connection point is a connection point between the second switching transistor and the third switching transistor, and the second connection point is a connection point between the sixth switching transistor and the seventh switching transistor.
In Article 11, The apparatus further includes a first substrate switching module and a second substrate switching module, wherein the first substrate switching module is connected to the substrate of the second switching transistor, and when the switched capacitor voltage converter is in an operating state, the substrate of the second switching transistor is connected to the output terminal, and when the switched capacitor voltage converter is in an operating state, the substrate of the second switching transistor is grounded. A switched capacitor voltage converter characterized in that the second substrate switching module is connected to the substrate of the sixth switching transistor, and when the switched capacitor voltage converter is in an operating state, the substrate of the sixth switching transistor is connected to the output terminal, and when the switched capacitor voltage converter is in an operating state, the substrate of the sixth switching transistor is grounded.
In Article 9, A switched capacitor voltage converter characterized in that the input terminal of the above switched capacitor voltage conversion circuit is grounded through a reference capacitor.
In any one of paragraphs 1 through 8, A switched capacitor voltage converter characterized in that the output terminal is grounded through an output capacitor, and the output capacitor is connected in parallel with an output resistor.
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Description

Switched Capacitor Voltage Converter This application relates to the field of electronic circuit technology, and in particular to switched capacitor voltage converters. Referring to FIG. 1, in a conventional switched capacitor voltage converter, a transistor (QA) is connected between an input terminal and a reference terminal (PMID), and the substrate of the transistor (QA) is connected to the source terminal of the transistor (QA), that is, connected to the reference terminal (PMID), and the conduction direction of the parasitic diode of the transistor (QA) is from the reference terminal (PMID) toward the input terminal, so that the input terminal and the output terminal of the switched capacitor voltage converter are completely blocked. When the switched capacitor voltage converter is operated, the loop regulator module monitors the difference between the output voltage (VOUT) and the corresponding target value, the difference between the input current (IBUS) and the corresponding target value, or the difference between other parameters and the corresponding target value, and can regulate the voltage (QA_GT) at the gate terminal of the transistor (QA), thereby regulating the voltage difference between the reference terminal (PMID) and the input terminal. A change in the voltage at the reference terminal (PMID) can cause a change in the output voltage (VOUT), input current (IBUS), or other parameters, so that the output voltage (VOUT), input current (IBUS), or other parameters are maintained at the corresponding target value. The structure of the switched capacitor voltage converter described above has the disadvantage that the area of such a transistor is large and the cost is high because the withstand voltage value of the transistor (QA) must exceed the maximum value of the input voltage (VBUS). In order to more clearly explain the embodiments of the present application or the technical solution according to the prior art, we will briefly introduce the attached drawings that should be referenced when describing the embodiments of the present application. However, the following attached drawings are merely some embodiments of the present application, and it is obvious that a person skilled in the art can derive other drawings from these drawings without creative effort. FIG. 1 is a circuit diagram of a conventional switched capacitor voltage converter according to an embodiment of the present application. FIG. 2 is a circuit diagram of a switched capacitor voltage converter according to an embodiment of the present application. FIG. 3 is a circuit diagram of two clamping circuits according to an embodiment of the present application. FIG. 4 is a diagram showing the connection relationship of a series-connected transistor and a series-connected diode according to an embodiment of the present application. Hereinafter, a technical solution according to an embodiment of the present application will be described clearly and completely with reference to the attached drawings. Of course, the described embodiment is merely a part of the embodiment, not the entire embodiment of the present application. Based on the embodiment of the present application, all other embodiments obtained by a person skilled in the art without creative effort will fall within the scope of protection of the present application. FIG. 1 is a circuit diagram of a conventional switched capacitor voltage converter, wherein the input terminal of the switched capacitor voltage converter is connected to an input voltage (VBUS) and the output terminal of the switched capacitor voltage converter is connected to an output voltage (VOUT), for example, the input voltage (VBUS) is about 10V and the output voltage (VOUT) is about 5V. The switched capacitor voltage converter satisfies two requirements: a) when the switched capacitor voltage converter is stopped, the input terminal and the output terminal are blocked in both directions, and b) the output voltage (VOUT), input current (IBUS), or other parameters can be adjusted so that the output voltage (VOUT), input current (IBUS), or other parameters are maintained at their corresponding target values. A dual switched capacitor voltage converter circuit with a ratio of 2:1 is connected between the reference terminal (PMID) and the output terminal of the switched capacitor voltage converter, wherein the substrate of the switching transistor (Q1A), the substrate of the switching transistor (Q3A), the substrate of the switching transistor (Q4A), the substrate of the switching transistor (Q1B), the substrate of the switching transistor (Q3B), and the substrate of the switching transistor (Q4B) are all connected to their respective source terminals, and the substrates of the switching transistor (Q2A) and the switching transistor (Q2B) are connected to the substrate switching module (BD SW). When the switched capacitor voltage converter operates normally, the BD SW module connects the substrate of the swi