CN115833574A - Negative voltage converter capable of eliminating resonance and semiconductor chip - Google Patents

Negative voltage converter capable of eliminating resonance and semiconductor chip Download PDF

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Publication number
CN115833574A
CN115833574A CN202211608929.3A CN202211608929A CN115833574A CN 115833574 A CN115833574 A CN 115833574A CN 202211608929 A CN202211608929 A CN 202211608929A CN 115833574 A CN115833574 A CN 115833574A
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switch
control
voltage
electrically connected
tube
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陈鑫
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Shanghai Southchip Semiconductor Technology Co Ltd
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Shanghai Southchip Semiconductor Technology Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

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Abstract

The embodiment of the application provides a negative voltage converter and a semiconductor chip capable of eliminating resonance. The negative voltage converter capable of eliminating resonance comprises: the circuit comprises a switch component, a switch component control circuit, a voltage conversion control circuit and an inductor; input voltage is connected to voltage conversion control circuit's first end electricity, voltage conversion control circuit's second end electricity connects the voltage output end of negative voltage converter, voltage conversion control circuit's third end electricity connection switch assembly's first end and the first end of inductance, switch assembly's second end and the second end of inductance all ground connection, input voltage is connected to switch assembly control circuit's first end electricity, switch assembly control circuit's second end electricity connection switch assembly's control end, switch assembly control circuit's control end electricity connection enable signal. The resonance-cancelable negative voltage converter can cancel the LC resonance in the negative voltage converter.

Description

Negative voltage converter capable of eliminating resonance and semiconductor chip
Technical Field
The embodiment of the application relates to the technical field of negative voltage conversion, in particular to a negative voltage converter capable of eliminating resonance and a semiconductor chip.
Background
The negative voltage converter can convert an input voltage into a negative output voltage, wherein the input voltage generally comes from a single lithium battery, the voltage of the single lithium battery is generally about 4V, and the output voltage ranges from-1V to-6V. When the inductor current in the negative voltage converter is 0, the connection between the inductor and the output end of the negative voltage converter can be disconnected, so as to avoid the inductor current reversal, and at this time, the negative voltage converter is in a Discontinuous Conduction Mode (DCM) state.
In the prior art, if the load of the negative voltage converter is always large, the inductive current is also always large, and the inductive current ripple cannot be reduced below 0A in the whole working period of the negative voltage converter, so that other actions cannot be triggered; if the load of the negative voltage converter is a medium-light load, the inductor current ripple may be reduced to below 0A, so that the connection between the inductor and the output terminal of the negative voltage converter is broken, and the energy remaining in the inductor may form an LC resonance phenomenon, resulting in a high-frequency ringing waveform.
However, in some environment-sensitive application scenarios, the high-frequency ringing waveform in the negative voltage converter may cause electromagnetic interference, and the electromagnetic interference may cause some application problems, i.e., the high-frequency ringing waveform is not expected to exist, and therefore, it is desirable to provide a negative voltage converter capable of reducing the high-frequency ringing waveform, i.e., a negative voltage converter capable of eliminating LC resonance.
Disclosure of Invention
In view of the above problems, embodiments of the present application provide a negative voltage converter and a semiconductor chip that can cancel resonance, which can cancel LC resonance in the negative voltage converter.
In a first aspect, an embodiment of the present application provides a negative voltage converter capable of eliminating resonance, including: the circuit comprises a switch component, a switch component control circuit, a voltage conversion control circuit and an inductor;
the first end of the voltage conversion control circuit is electrically connected with an input voltage, the second end of the voltage conversion control circuit is electrically connected with the voltage output end of the negative voltage converter, the third end of the voltage conversion control circuit is electrically connected with the first end of the switch component and the first end of the inductor, the second end of the switch component and the second end of the inductor are both grounded, the first end of the switch component control circuit is electrically connected with the input voltage, the second end of the switch component control circuit is electrically connected with the control end of the switch component, and the control end of the switch component control circuit is electrically connected with an enable signal;
the switch component control circuit is used for conducting the input voltage and the control end of the switch component when the enable signal is a first level signal; the first level signal is a signal generated when LC resonance exists at the first end of the inductor;
the switch assembly is used for conducting the first end of the inductor and the ground under the action of the input voltage.
In some embodiments, the switching assembly control circuit comprises: the first switch tube, the second switch tube, the third switch tube and the fourth switch tube;
the control end electricity of first switch tube is connected enable signal, the first end electricity of first switch tube is connected input voltage, the second end electricity of first switch tube is connected switch assembly's control end with the first end of second switch tube, the second end electricity of second switch tube is connected the first end of third switch tube with the control end of fourth switch tube, the control end electricity of third switch tube is connected the first end of fourth switch tube, the second end of third switch tube with the equal electricity of second end of fourth switch tube is connected voltage output end.
In some embodiments, the third terminal of the switching element control circuit is electrically connected to the voltage output terminal;
the switch component control circuit is further configured to disconnect the connection between the input voltage and the control end of the switch component and to connect the control end of the switch component and the voltage output end when the enable signal is a second level signal; wherein the second level signal is a signal generated when there is no LC resonance at the first end of the inductor;
the switch assembly is further used for disconnecting the first end of the inductor from the ground under the action of the output voltage.
In some embodiments, the switching assembly control circuit further comprises: a fifth switching tube, a sixth switching tube and a phase inverter;
the control end of the fifth switch tube and the input end of the phase inverter are electrically connected with the enable signal, the first end of the fifth switch tube is electrically connected with the input voltage, the second end of the fifth switch tube is electrically connected with the first end of the sixth switch tube, the second end of the sixth switch tube is electrically connected with the first end of the fourth switch tube, and the output end of the phase inverter is electrically connected with the control end of the first switch tube.
In some embodiments, the negative voltage converter that cancels resonance further comprises: a clamp circuit;
the first end of the clamping circuit is electrically connected with the control end of the second switching tube and the control end of the sixth switching tube, and the second end of the clamping circuit is electrically connected with the voltage output end.
In some embodiments, the switch assembly comprises: a seventh switching tube and an eighth switching tube;
the first end of the seventh switch tube is electrically connected with the first end of the eighth switch tube, the second end of the seventh switch tube is electrically connected with the first end of the inductor, the second end of the eighth switch tube is grounded, and the control end of the seventh switch tube and the control end of the eighth switch tube are both electrically connected with the second end of the first switch tube.
In some embodiments, the seventh switching tube comprises a first parasitic diode, and the eighth switching tube comprises a second parasitic diode;
the negative electrode of the first parasitic diode is electrically connected with the negative electrode of the second parasitic diode, the positive electrode of the first parasitic diode is electrically connected with the first end of the inductor, and the positive electrode of the second parasitic diode is grounded.
In some embodiments, the voltage conversion control circuit comprises: a first control switch and a second control switch;
the first end of the first control switch is electrically connected with the input voltage, the second end of the first control switch is electrically connected with the first end of the second control switch and the first end of the inductor, and the second end of the second control switch is electrically connected with the voltage output end;
the negative voltage converter further includes: the input end of the enable signal generating circuit is electrically connected with the control end of the first control switch and the control end of the second control switch, and the output end of the enable signal generating circuit is electrically connected with the control end of the switch component control circuit;
the enable signal generating circuit is configured to generate the first level signal when the control voltage of the first control switch is a first voltage and the control voltage of the second control switch is a second voltage; the first control switch is in a cut-off state under the action of the first voltage, and the second control switch is in a cut-off state under the action of the second voltage.
In some embodiments, the negative voltage converter that cancels resonance further comprises: a first comparator and a control logic circuit;
a first input end of the first comparator is electrically connected with a first end of the inductor, a second input end of the first comparator is electrically connected with the voltage output end, an output end of the first comparator is electrically connected with a first end of the control logic circuit, and a second end of the control logic circuit is electrically connected with a control end of the voltage conversion control circuit;
the first comparator is used for outputting a disconnection control signal when the current of the inductor is 0;
and the control logic circuit is used for disconnecting the second end of the voltage conversion control circuit and the third end of the voltage conversion control circuit based on the disconnection control signal.
In some embodiments, the negative voltage converter that cancels resonance further comprises an error amplifier and a second comparator;
the first input end of the error amplifier is electrically connected with the voltage output end, the second input end of the error amplifier is electrically connected with reference voltage, the output end of the error amplifier is electrically connected with the first input end of the second comparator, the second input end of the second comparator is electrically connected with a triangular wave signal, and the output end of the second comparator is electrically connected with the third end of the control logic circuit;
the error amplifier is used for generating an amplified error voltage based on the reference voltage and an output voltage;
the second comparator is configured to generate a pulse modulation signal based on the amplified error voltage and the triangular wave signal.
In a second aspect, an embodiment of the present application provides a semiconductor chip, including: the first aspect provides any negative voltage converter that cancels resonance.
In the technical scheme of the embodiment of the application, the negative voltage converter capable of eliminating resonance comprises a switch component, a switch component control circuit, a voltage conversion control circuit and an inductor; the first end of the voltage conversion control circuit is electrically connected with input voltage, the second end of the voltage conversion control circuit is electrically connected with the voltage output end of the negative voltage converter, the third end of the voltage conversion control circuit is electrically connected with the first end of the switch component and the first end of the inductor, the second end of the switch component and the second end of the inductor are both grounded, the first end of the switch component control circuit is electrically connected with the input voltage, the second end of the switch component control circuit is electrically connected with the control end of the switch component, and the control end of the switch component control circuit is electrically connected with an enable signal; the input voltage and the control end of the switch component can be conducted through the switch component control circuit when the enabling signal is a first level signal, wherein the first level signal is a signal generated when LC resonance exists at the first end of the inductor; the switch component can conduct the first end of the inductor and the ground under the action of the input voltage, so that the energy remaining in the inductor forms a low-resistance path to the ground through the switch component, the energy remaining in the inductor can be fully discharged to the ground, an obvious LC resonance phenomenon cannot occur, and LC resonance in the negative voltage converter can be eliminated.
The foregoing description is only an overview of the technical solutions of the embodiments of the present application, and the embodiments of the present application can be implemented according to the content of the description in order to make the technical means of the embodiments of the present application more clearly understood, and the detailed description of the present application is provided below in order to make the foregoing and other objects, features, and advantages of the embodiments of the present application more clearly understandable.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1A is a timing diagram of a heavy-load lower negative voltage converter according to an embodiment of the present disclosure;
fig. 1B is a timing diagram of a low negative voltage converter with a medium-light load according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a negative voltage converter capable of eliminating resonance according to an embodiment of the present disclosure;
fig. 3 is a schematic diagram of a partial structure of a negative voltage converter capable of eliminating resonance according to an embodiment of the present application;
FIG. 4 is an equivalent circuit diagram of the negative voltage converter capable of eliminating resonance shown in FIG. 3 at a first level signal;
fig. 5 is a schematic diagram of a partial structure of another negative voltage converter capable of eliminating resonance according to an embodiment of the present application;
FIG. 6 is an equivalent circuit diagram of the negative voltage converter with resonance elimination shown in FIG. 5 under a second level signal;
fig. 7 is a schematic structural diagram of another negative voltage converter capable of eliminating resonance according to an embodiment of the present application;
fig. 8 is a schematic structural diagram of another negative voltage converter capable of eliminating resonance according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "including" and "having," and any variations thereof in the description and claims of this application and the description of the figures are intended to cover a non-exclusive inclusion.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase "embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
Furthermore, the terms "first," "second," and the like in the description and claims of the present application or in the above-described drawings are used for distinguishing between different objects and not necessarily for describing a particular sequential order, and may explicitly or implicitly include one or more of the features.
In the description of the present application, unless otherwise expressly specified or limited, the terms "connected" or "connecting" are to be construed broadly, e.g., "connected" or "connected" of a circuit arrangement may mean, in addition to physical connection, electrical connection or signal connection, e.g., direct connection, i.e., physical connection, indirect connection via at least one intervening element, as long as electrical continuity is achieved, or communication between two elements; signal connection may refer to signal connection through a medium, such as radio waves, in addition to signal connection through circuitry.
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.
Fig. 1A is a timing diagram of a lower negative voltage converter under a heavy load according to an embodiment of the present disclosure, and fig. 1B is a timing diagram of a lower negative voltage converter under a medium-light load according to an embodiment of the present disclosure, as shown in fig. 1A and fig. 1B, GHS is a control voltage of an upper switch tube in the negative voltage converter, IL is an inductor current in the negative voltage converter, ZCD is a control signal of a lower switch tube generated by the negative voltage converter based on the inductor current IL, and SW is a voltage signal at a connection point a of the inductor, the upper switch tube, and the lower switch tube.
If the load of the negative voltage converter is a heavy load, as shown in fig. 1A, when the control voltage GHS of the upper switching tube is pulled high, the inductor current IL continuously increases, and the voltage signal SW at the connection point a is maintained at a high level; when the control voltage GHS of the upper switch tube is pulled low, the inductor current IL gradually decreases, and during the increase and decrease of the inductor current IL, the inductor current IL is maintained to be greater than 0A, and the voltage signal SW at the connection point a is maintained at a low level. Therefore, in the whole working period, the inductive current IL is always large, the ripple of the inductive current IL cannot be reduced to be below 0A, the control signal ZCD of the lower switching tube is always 0, and other actions cannot be triggered.
If the load of the negative voltage converter is a medium-light load, as shown in fig. 1B, when the control voltage GHS of the upper switching tube is pulled high, the inductor current IL continuously increases, and the voltage signal SW at the connection point a is maintained at a high level; when the control voltage GHS of the upper switch tube is pulled low, the inductor current IL gradually decreases until it decreases to 0A and remains at 0A. Before the inductor current IL drops to 0A, the voltage signal SW at the connection point a is maintained at a low level; when the inductor current IL drops to 0A, the control signal ZCD of the lower switch tube is pulled to a high level, that is, the lower switch tube is turned off, and LC resonance is formed between the energy remaining in the inductor L and the parasitic capacitance of the connection point a, and the voltage signal SW at the connection point a at this time is an LC resonance signal, that is, a high-frequency ringing waveform appears.
In some environment-sensitive application scenarios, the high-frequency ringing waveform may cause unwanted electromagnetic interference, thereby causing some application problems. For example, in a display scene, the electromagnetic radiation interference caused by the high-frequency ringing waveform affects the display effect, and therefore, it is desirable to provide a negative voltage converter capable of eliminating the LC resonance.
Fig. 2 is a schematic structural diagram of a negative voltage converter capable of eliminating resonance according to an embodiment of the present application, and as shown in fig. 2, the negative voltage converter 100 capable of eliminating resonance includes: a switching element 110, a switching element control circuit 120, a voltage conversion control circuit 130, and an inductance L.
The first end of the voltage conversion control circuit 130 is electrically connected to the input voltage Vin, the second end of the voltage conversion control circuit 130 is electrically connected to the voltage output end OUT of the negative voltage converter 100 capable of eliminating resonance, the third end of the voltage conversion control circuit 130 is electrically connected to the first end of the switch component 110 and the first end of the inductor L, the second end of the switch component 110 and the second end of the inductor L are both grounded, the first end of the switch component control circuit 120 is electrically connected to the input voltage Vin, the second end of the switch component control circuit 120 is electrically connected to the control end of the switch component 110, and the control end of the switch component control circuit 120 is electrically connected to the enable signal EN.
The switching element control circuit 120 is configured to turn on the input voltage Vin and the control terminal of the switching element 110 when the enable signal EN is the first level signal; the first level signal is a signal generated when the first end of the inductor L has LC resonance. The switch element 110 is configured to conduct the first end of the inductor L and the ground under the action of the input voltage Vin.
Illustratively, as shown in fig. 2, the voltage conversion control circuit 130 includes: the first end of the first control switch MHS is electrically connected with the input voltage Vin, the second end of the first control switch MHS is electrically connected with the first end of the second control switch MLS and the first end of the inductor L, and the second end of the second control switch MLS is electrically connected with the voltage output end OUT.
As shown in fig. 2, the first terminal of the first control switch MHS is the first terminal of the voltage conversion control circuit 130, the first terminal of the first control switch MHS is electrically connected to the input voltage Vin, and the first terminal of the voltage conversion control circuit 130 is electrically connected to the input voltage Vin. The second terminal of the second control switch MLS is electrically connected to the second terminal of the voltage conversion control circuit 130, the second terminal of the second control switch MLS is electrically connected to the voltage output terminal OUT of the negative voltage converter 100 capable of eliminating resonance, and the second terminal of the voltage conversion control circuit 130 is electrically connected to the voltage output terminal OUT. A connection point between the second terminal of the first control switch MHS and the first terminal of the second control switch MLS is a third terminal of the voltage conversion control circuit 130, the second terminal of the first control switch MHS is electrically connected to the first terminal of the second control switch MLS and the first terminal of the inductor L, and then the third terminal of the voltage conversion control circuit 130 is electrically connected to the first terminal of the switch assembly 110 and the first terminal of the inductor L.
The second end of the inductor L is grounded to the upper plate of the output capacitor Cout, and the lower plate of the output capacitor Cout is electrically connected to the voltage output terminal OUT. If the first control switch MHS is turned on and the second control switch MLS is turned off, the input voltage Vin and the first end of the inductor L may be turned on, the current direction is that the input voltage Vin flows to the ground through the inductor L, the current direction of the inductor L flows to the second end of the inductor L through the first end of the inductor L, and the inductor L may store energy, that is, the inductor L is in a charging state. If the first control switch MHS is turned off and the second control switch MLS is turned on, the first end of the inductor L and the power output terminal OUT can be turned on, and the current direction of the inductor L cannot change suddenly, so that the current direction of the inductor L still flows from the first end of the inductor L to the second end of the inductor L, that is, the current of the inductor L flows from the voltage output terminal OUT to the ground through the inductor L. Thus, the lower plate of the output capacitor Cout is discharged, and a negative voltage, i.e., the output voltage Vout, can be output at the voltage output terminal OUT.
With continued reference to fig. 2, the switching element control circuit 120 may receive the enable signal EN, wherein the enable signal EN is a first level signal when the LC resonance exists at the first end of the inductor L, for example, the first level signal is a low level signal. Under the action of the first level signal, the switching element control circuit 120 may turn on a first terminal of the switching element control circuit 120 and a second terminal of the switching element control circuit 120. Since the first terminal of the switch device control circuit 120 is electrically connected to the input voltage Vin and the second terminal of the switch device control circuit 120 is electrically connected to the control terminal of the switch device 110, under the action of the first level signal, the switch device control circuit 120 may turn on the input voltage Vin and the control terminal of the switch device 110, that is, may provide the input voltage Vin to the control terminal of the switch device 110.
The switching element 110 may conduct the first terminal of the switching element 110 and the second terminal of the switching element 110 under the action of the input voltage Vin. Since the first terminal of the switch element 110 is electrically connected to the first terminal of the inductor L, and the second terminal of the switch element 110 is grounded, the switch element 110 can conduct the first terminal of the inductor L and the ground under the action of the input voltage Vin.
In summary, when the LC resonance exists at the first end of the inductor L, the switch device control circuit 120 may turn on the input voltage Vin and the control end of the switch device 110, so as to turn on the first end of the switch device 110 and the second end of the switch device 110, and further turn on the first end of the inductor L and the ground. In this way, the energy remaining in the inductor L forms a low-impedance path to the ground through the switching component 110, and the energy remaining in the inductor L is all discharged to the ground, so that no obvious LC resonance phenomenon occurs, and the LC resonance is eliminated.
In the embodiment of the application, the negative voltage converter capable of eliminating resonance comprises a switch component, a switch component control circuit, a voltage conversion control circuit and an inductor; the first end of the voltage conversion control circuit is electrically connected with input voltage, the second end of the voltage conversion control circuit is electrically connected with the voltage output end of the negative voltage converter, the third end of the voltage conversion control circuit is electrically connected with the first end of the switch component and the first end of the inductor, the second end of the switch component and the second end of the inductor are both grounded, the first end of the switch component control circuit is electrically connected with the input voltage, the second end of the switch component control circuit is electrically connected with the control end of the switch component, and the control end of the switch component control circuit is electrically connected with an enable signal; the control circuit of the switch component can conduct the input voltage and the control end of the switch component when the enable signal is a first level signal, wherein the first level signal is a signal generated when LC resonance exists at the first end of the inductor; the switch component can conduct the first end of the inductor and the ground under the action of the input voltage, so that the energy remaining in the inductor forms a low-resistance path to the ground through the switch component, the energy remaining in the inductor can be fully discharged to the ground, an obvious LC resonance phenomenon cannot occur, and LC resonance in the negative voltage converter can be eliminated.
In some implementations, fig. 3 is a schematic diagram of a partial structure of a negative voltage converter capable of eliminating resonance according to an embodiment of the present application, and fig. 3 is a schematic diagram of a switching element control circuit 120 based on the embodiment shown in fig. 2, and includes: the circuit comprises a first switching tube Q1, a second switching tube Q2, a third switching tube Q3 and a fourth switching tube Q4.
The control end of the first switch tube Q1 is electrically connected to the enable signal EN, the first end of the first switch tube Q1 is electrically connected to the input voltage Vin, the second end of the first switch tube Q1 is electrically connected to the control end of the switch component 110 and the first end of the second switch tube Q2, the second end of the second switch tube Q2 is electrically connected to the first end of the third switch tube Q3 and the control end of the fourth switch tube Q4, the control end of the third switch tube Q3 is electrically connected to the first end of the fourth switch tube Q4, and the second end of the third switch tube Q3 and the second end of the fourth switch tube Q4 are electrically connected to the voltage output end OUT.
For example, fig. 4 is an equivalent circuit diagram of the negative voltage converter capable of eliminating resonance shown in fig. 3 under a first level signal, as shown in fig. 4, if the enable signal EN is the first level signal, the first switch tube Q1 may receive the first level signal, and under the effect of the first level signal, two ends of the first switch tube Q1 are conducted. The first end of the first switch tube Q1 is electrically connected to the input voltage Vin, the second end of the first switch tube Q1 is electrically connected to the first end of the second switch tube Q2, and the input voltage Vin is conducted with the first end of the second switch tube Q2.
The control end of the second switching tube Q2 is electrically connected with a clamping voltage V CLP At a clamping voltage V CLP Under the action of (1), two ends of the second switch tube Q2 are conducted, and a second end of the second switch tube Q2 is electrically connectedWhen the control end of the fourth switching tube Q4 is connected, the input voltage Vin is conducted with the control end of the fourth switching tube Q4, that is, the voltage Vin is input to the control end of the fourth switching tube Q4. Under the action of the input voltage Vin, two ends of the fourth switching tube Q4 are conducted, and since the first end of the fourth switching tube Q4 is electrically connected to the control end of the third switching tube Q3 and the second end of the fourth switching tube Q4 is electrically connected to the voltage output end OUT, the control end of the third switching tube Q3 is conducted with the negative output voltage Vout, that is, the negative output voltage Vout is provided to the control end of the third switching tube Q3.
Under the action of the negative output voltage Vout, the two ends of the third switching tube Q3 are disconnected, and since the first end of the third switching tube Q3 is electrically connected to the second end of the second switching tube Q2 and the second end of the third switching tube Q3 is electrically connected to the voltage output terminal OUT, the second end of the second switching tube Q2 is disconnected from the output voltage Vout.
In summary, if the enable signal EN is the first level signal, the switch device control circuit 120 can turn on the input voltage Vin and the first end of the second switch Q2, and turn off the connection between the first end of the second switch Q2 and the output voltage Vout. In addition, the first end of the second switch Q2 is electrically connected to the control end of the switch element 110, so that the voltage at the control end of the switch element 110 can be pulled up to the input voltage Vin, and the two ends of the switch element 110 are conducted, and the first end of the inductor L is conducted with the ground.
In some implementations, with continued reference to fig. 2 and 3, the third terminal of the switching element control circuit 120 is electrically connected to the voltage output terminal Vout.
The switching element control circuit 120 is further configured to disconnect the connection between the input voltage Vin and the control terminal of the switching element 110 and turn on the control terminal of the switching element 110 and the voltage output terminal OUT when the enable signal EN is the second level signal; the second level signal is a signal generated when there is no LC resonance at the first end of the inductor L. The switch assembly 110 is further configured to disconnect the first end of the inductor L from ground under the action of the output voltage.
For example, when there is no LC resonance at the first end of the inductor L, the enable signal EN received by the switching element control circuit 120 is a second level signal, for example, the second level signal is a low level signal. Under the action of the second level signal, the switching element control circuit 120 may disconnect the first terminal of the switching element control circuit 120 from the second terminal of the switching element control circuit 120, and simultaneously turn on the third terminal of the switching element control circuit 120 from the second terminal of the switching element control circuit 120. Since the third terminal of the switching device control circuit 120 is electrically connected to the output voltage Vout, under the action of the second level signal, the switching device control circuit 120 can turn on the output voltage Vout and the control terminal of the switching device 110, and turn off the connection between the input voltage Vin and the control terminal of the switching device 110, that is, can provide the output voltage Vout to the control terminal of the switching device 110.
The switching element 110 may disconnect the first terminal of the switching element 110 from the second terminal of the switching element 110, i.e. disconnect the first terminal of the inductor L from ground, under the action of the output voltage Vout. In this way, when there is no LC resonance at the first end of the inductor L, the switching element control circuit 120 may disconnect the input voltage Vin from the control end of the switching element 110 and turn on the output voltage Vout from the control end of the switching element 110, so as to disconnect the connection between the first end of the switching element 110 and the second end of the switching element 110, and further disconnect the direct connection between the first end of the inductor L and the ground, so that the energy at the first end of the inductor L flows to the ground through the inductor L.
In some implementations, fig. 5 is a schematic diagram of a partial structure of another negative voltage converter capable of eliminating resonance according to an embodiment of the present application, and the switching element control circuit 120 further includes: a fifth switching tube Q5, a sixth switching tube Q6 and an inverter 121.
The control end of the fifth switch tube Q5 and the input end of the phase inverter 121 are both electrically connected to enable signal EN, the first end of the fifth switch tube Q5 is electrically connected to input voltage Vin, the second end of the fifth switch tube Q5 is electrically connected to the first end of the sixth switch tube Q6, the second end of the sixth switch tube Q6 is electrically connected to the first end of the fourth switch tube Q4, and the output end of the phase inverter 121 is electrically connected to the control end of the first switch tube Q1.
For example, fig. 6 is an equivalent circuit schematic diagram of the negative voltage converter capable of eliminating resonance shown in fig. 5 under a second level signal, as shown in fig. 6, if the enable signal EN is the second level signal, the inverter 121 may receive the second level signal, invert the second level signal, and output the inverted second level signal to the control terminal of the first switch Q1, and under the action of the inverted signal of the second level signal, the two terminals of the first switch Q1 are disconnected, that is, the connection between the input voltage Vin and the control terminal of the switch element 110 is disconnected. For example, the second level signal is a low level signal, the inverter 121 converts the low level signal into a high level signal, and the two ends of the first switch tube Q1 are disconnected under the action of the high level signal.
The fifth switching tube Q5 may receive the second level signal, and under the effect of the second level signal, two ends of the fifth switching tube Q5 are conducted. The first end of the fifth switching tube Q5 is electrically connected to the input voltage Vin, the second end of the fifth switching tube Q5 is electrically connected to the first end of the sixth switching tube Q6, and the input voltage Vin is conducted with the first end of the sixth switching tube Q6.
The control end of the sixth switching tube Q6 is electrically connected with a clamping voltage V CLP At a clamping voltage V CLP Under the action of the third switch Q3, two ends of the sixth switch Q6 are conducted, and the second end of the sixth switch Q6 is electrically connected to the control end of the third switch Q3, so that the input voltage Vin is conducted with the control end of the third switch Q3, that is, the voltage Vin is input to the control end of the third switch Q3. Under the action of the input voltage Vin, the two ends of the third switching tube Q3 are conducted, and since the first end of the third switching tube Q3 is electrically connected to the control end of the fourth switching tube Q4 and the second end of the third switching tube Q3 is electrically connected to the voltage output end OUT, the control end of the fourth switching tube Q4 is conducted with the negative output voltage Vout, that is, the negative output voltage Vout is provided to the control end of the third switching tube Q3.
Under the action of the negative output voltage Vout, the two ends of the fourth switching tube Q4 are disconnected, i.e. the output voltage Vout is electrically disconnected from the first end of the fourth switching tube Q4. The second end of the sixth switching tube Q6 is electrically connected to the first end of the fourth switching tube Q4, and both ends of the sixth switching tube Q6 are connected, so that the input voltage Vin is connected to the first end of the fourth switching tube Q4. In this way, the voltage of the first terminal of the fourth transistor Q4 is pulled up to the input voltage Vin, i.e. the voltage of the control terminal of the third transistor Q3 is pulled up to the input voltage Vin.
Under the action of the input voltage Vin, two ends of the third switching tube Q3 are conducted, that is, the second end of the second switching tube Q2 and the output voltage Vout can be conducted; in addition, at the clamping voltage V CLP Under the action of the second switch Q2, the two ends of the second switch Q2 are conducted, so as to conduct the output voltage Vout and the second end of the second switch Q2, i.e. conduct the output voltage Vout and the control end of the switch element 110.
To sum up, if the enable signal EN is the second level signal, the switch device control circuit 120 may disconnect the connection between the input voltage Vin and the first end of the second switch Q2, and turn on the first end of the second switch Q2 and the output voltage Vout, and may pull down the voltage of the control end of the switch device 110 to the output voltage Vout, thereby disconnecting the first end of the switch device 110 and the second end of the switch device 110, and further disconnecting the connection between the first end of the inductor L and the ground.
In some embodiments, the clamping voltage V CLP The negative voltage converter 100 capable of eliminating resonance, which can be generated by the clamping circuit 140, as shown in fig. 3 and 5, further includes: and a first end of the clamping circuit 140 is electrically connected to the control end of the second switching tube Q2 and the control end of the sixth switching tube Q6, and a second end of the clamping circuit 140 is electrically connected to the voltage output end OUT.
Illustratively, as shown in fig. 3 and 5, the clamping circuit 140 includes a resistor Rs and a clamping switch DZ, a first end of the resistor Rs is electrically connected to the input voltage Vin, a second end of the resistor R2 is electrically connected to a negative electrode of the clamping switch DZ, a control end of the second switch Q2, and a control end of the sixth switch Q6, and a positive electrode of the clamping switch DZ is electrically connected to the voltage output terminal Vout. Thus, the cathode voltage of the clamping switch tube DZ is the clamping voltage V CLP The positive electrode voltage of the clamp switching tube DZ is Vout.
The clamping switch tube DZ can be, for example, a zener diode, and a reverse voltage is applied across the zener diode, and the reverse breakdown voltage of the zener diode is 5.5V, then V CLP Vout =5.5V. The threshold voltages of the second switch transistor Q2 and the sixth switch transistor Q6 are generally equal to about 0.7V, and thenThe maximum voltage difference between the control end and the second end of the third switching tube Q3 is 5.5V-0.7v =4.8v, and the maximum voltage difference between the control end and the second end of the fourth switching tube Q4 is 4.8V, so that the third switching tube Q3 and the fourth switching tube Q4 can both adopt currently-used 5V semiconductor devices.
It should be noted that fig. 3 and 5 only exemplarily show that the clamping circuit 140 includes the resistor Rs and the clamping switch DZ, and in other embodiments, the resistor Rs may be replaced by the current source Ib.
In some embodiments, referring to fig. 3-6, the switch assembly 110 includes: a seventh switching tube Q7 and an eighth switching tube Q8, wherein the first end of the seventh switching tube Q7 is electrically connected to the first end of the eighth switching tube Q8, the second end of the seventh switching tube Q7 is electrically connected to the first end of the inductor L, the second end of the eighth switching tube Q8 is grounded, and the control end of the seventh switching tube Q7 and the control end of the eighth switching tube Q8 are both electrically connected to the second end of the first switching tube Q1.
Illustratively, as shown in fig. 3 to 6, the second terminal of the seventh switching tube Q7 is the first terminal of the switching component 110, and the second terminal of the eighth switching tube Q8 is the second terminal of the switching component 110, so that the first terminal of the inductor L is grounded through the seventh switching tube Q7 and the eighth switching tube Q8 in sequence. If the second end of the first switch Q1 is connected to the input voltage Vin, the voltage at the control end of the seventh switch Q7 and the voltage at the control end of the eighth switch Q8 are both pulled up to the input voltage Vin, and at this time, the seventh switch Q7 and the eighth switch Q8 are both connected, as shown in fig. 4, the energy remaining at the first end of the inductor L flows to the ground through the seventh switch Q7 and the eighth switch Q8 in sequence.
If the second end of the first switch Q1 is conducted with the output voltage Vout, the voltage of the control end of the seventh switch Q7 and the voltage of the control end of the eighth switch Q8 are both pulled down to the output voltage Vout, at this time, the seventh switch Q7 and the eighth switch Q8 are both turned off, and as shown in fig. 6, the energy of the first end of the inductor L flows to the ground through the inductor L.
In some embodiments, referring to fig. 3 to 6, the seventh switching tube Q7 includes a first parasitic diode D1, and the eighth switching tube Q8 includes a second parasitic diode D2, wherein a cathode of the first parasitic diode D1 is electrically connected to a cathode of the second parasitic diode D2, an anode of the first parasitic diode D1 is electrically connected to the first end of the inductor L, and an anode of the second parasitic diode D2 is grounded.
Illustratively, during the charging process of the inductor L, the voltage at the first end of the inductor L is gradually pulled high, and the positive electrode of the first parasitic diode D1 is electrically connected to the first end of the inductor L, so that the voltage at the positive electrode of the first parasitic diode D1 is pulled high, and the first parasitic diode D1 is turned on. However, the anode of the second parasitic diode D2 is grounded, the cathode of the second parasitic diode D2 is electrically connected to the cathode of the first parasitic diode D1, and the cathode voltage of the second parasitic diode D2 is higher than the anode voltage, so that the second parasitic diode D2 is disconnected, thereby preventing the energy stored in the inductor L from being discharged to the ground during the charging process of the inductor L, and ensuring the normal operation of the negative voltage converter capable of eliminating the resonance.
In some embodiments, fig. 7 is a schematic structural diagram of another negative voltage converter capable of eliminating resonance according to the present embodiment, and fig. 7 is a schematic structural diagram of the negative voltage converter 100 capable of eliminating resonance according to the embodiment shown in fig. 2, further including: and an enable signal generating circuit 150, wherein an input terminal of the enable signal generating circuit 150 is electrically connected to the control terminal of the first control switch MHS and the control terminal of the second control switch MLS, and an output terminal of the enable signal generating circuit 150 is electrically connected to the control terminal of the switching element control circuit 120.
An enable signal generating circuit 150 for generating a first level signal when a control voltage of the first control switch MHS is a first voltage and a control voltage of the second control switch MLS is a second voltage; under the action of the first voltage, the first control switch MHS is in an off state, and under the action of the second voltage, the second control switch MLS is in an off state.
Illustratively, the first voltage is a high voltage, the second voltage is a low voltage, the first control switch MHS is turned on by the high voltage, and the second control switch MLS is turned off by the low voltage. The enable signal generating circuit 150 may receive a first voltage and a second voltage, and generate the enable signal EN as a first level signal when the first voltage is a high voltage and the second voltage is a low voltage. Under the action of the first level signal, the first terminal of the switch component control circuit 120 and the second terminal of the switch component control circuit 120 are conducted.
In the embodiment of the present application, only the first switching tube Q1, the fifth switching tube Q5, and the first control switch MHS are PMOS, and the second switching tube Q2, the third switching tube Q3, the fourth switching tube Q4, the sixth switching tube Q6, the seventh switching tube Q7, the eighth switching tube Q8, and the second control switch MLS are NMOS. In another embodiment, the first switching tube Q1, the fifth switching tube Q5 and the first control switch MHS may be NMOS, and the second switching tube Q2, the third switching tube Q3, the fourth switching tube Q4, the sixth switching tube Q6, the seventh switching tube Q7, the eighth switching tube Q8 and the second control switch MLS may be PMOS.
In some embodiments, fig. 8 is a schematic structural diagram of another negative voltage converter capable of eliminating resonance according to an embodiment of the present application, and fig. 8 is a schematic structural diagram of the negative voltage converter 100 capable of eliminating resonance based on the embodiment shown in fig. 2, further including: a first comparator COMP1 and a control logic circuit 160.
A first input end of the first comparator COMP1 is electrically connected to the first end of the inductor L, a second input end of the first comparator COMP1 is electrically connected to the voltage output end OUT, an output end of the first comparator COMP1 is electrically connected to the first end of the control logic circuit 160, and a second end of the control logic circuit 160 is electrically connected to the control end of the voltage conversion control circuit 130.
The first comparator COMP1 is configured to output a turn-off control signal when the current of the inductor L is 0. And a control logic circuit 160 for disconnecting the second terminal of the voltage conversion control circuit 130 and the third terminal of the voltage conversion control circuit 130 based on the disconnection control signal.
For example, as shown in fig. 8, the first comparator COMP1 may receive the inductor current IL and output a positive pulse signal, i.e., an off control signal, when the inductor current IL is 0A. The control logic circuit 160 may receive the off control signal and control the two terminals of the second control switch MLS to be turned off based on the off control signal, that is, control the second terminal of the voltage conversion control circuit 130 and the third terminal of the voltage conversion control circuit 130 to be turned off, so as to prevent the inductor current IL from reversing.
In some embodiments, with continued reference to fig. 8, the negative voltage converter 100 that can cancel resonance further includes an error amplifier EA and a second comparator COMP2.
The first input end of the error amplifier EA is electrically connected to the voltage output end OUT, the second input end of the error amplifier EA is electrically connected to the reference voltage Vset, the output end of the error amplifier EA is electrically connected to the first input end of the second comparator COMP2, the second input end of the second comparator COMP2 is electrically connected to the triangular wave signal Vramp, and the output end of the second comparator COMP2 is electrically connected to the third end of the control logic circuit 130.
An error amplifier EA for generating an amplified error voltage V based on the reference voltage Vset and the output voltage Vout EA . A second comparator COMP2 for amplifying the error voltage V EA And the triangular wave signal Vramp generates a pulse modulation signal PWM.
Illustratively, as the output voltage Vout is stepped to a negative voltage, the output voltage Vout is fed back into the error amplifier EA. The error amplifier EA may determine an error voltage Vout-Vset between the output voltage Vout and the reference voltage using the reference voltage Vset as a reference voltage, and amplify the error voltage Vout-Vset to obtain an amplified error voltage V between the output voltage Vout and the reference voltage EA . The second comparator COMP2 may receive the amplified error voltage V EA And based on the amplified error voltage V EA And the difference value of the triangular wave signal Vramp generates a pulse modulation signal PWM, wherein the pulse modulation signal PWM can control the on duty ratio of the first control switch MHS and the second control switch MLS, thereby playing the role of regulating the output voltage Vout.
For example, when the output voltage Vout is lower than the reference voltage Vset, the amplified error voltage V output from the error amplifier EA EA The duty ratio of the pulse modulation signal PWM outputted by the second comparator COMP2 becomes low due to the low-voltage, so that the output voltage Vout is increased to reach a feedback balance point, and a relatively stable output voltage is obtainedVoltage Vout.
The embodiment of the present application further provides a semiconductor chip, which includes the negative voltage converter 100 capable of eliminating resonance provided in any of the above embodiments.
Illustratively, by integrating the negative voltage converter 100 capable of eliminating resonance provided by any of the above embodiments into a semiconductor chip, the volume of the negative voltage converter 100 capable of eliminating resonance can be reduced, which is beneficial to the miniaturization development of the negative voltage converter 100 capable of eliminating resonance.
The semiconductor chip provided by the embodiment of the present application includes the negative voltage converter 100 capable of eliminating resonance provided by any of the above embodiments, and has the same functional blocks and beneficial effects as the negative voltage converter 100 capable of eliminating resonance, and details are not repeated here.
The above disclosure is only for the specific embodiments of the present application, but the embodiments of the present application are not limited thereto, and any variations that can be considered by those skilled in the art are intended to fall within the scope of the present application.
The word "comprising" as used herein does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The application may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means can be embodied by one and the same item of hardware. The use of first, second, third, etc. does not denote any order, and the words may be interpreted as names. The steps in the above embodiments should not be construed as limiting the order of execution unless specified otherwise.
The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.

Claims (11)

1. A negative voltage converter capable of eliminating resonance, comprising: the circuit comprises a switch component, a switch component control circuit, a voltage conversion control circuit and an inductor;
the first end of the voltage conversion control circuit is electrically connected with an input voltage, the second end of the voltage conversion control circuit is electrically connected with the voltage output end of the negative voltage converter, the third end of the voltage conversion control circuit is electrically connected with the first end of the switch assembly and the first end of the inductor, the second end of the switch assembly and the second end of the inductor are both grounded, the first end of the switch assembly control circuit is electrically connected with the input voltage, the second end of the switch assembly control circuit is electrically connected with the control end of the switch assembly, and the control end of the switch assembly control circuit is electrically connected with an enable signal;
the switch component control circuit is used for conducting the input voltage and the control end of the switch component when the enable signal is a first level signal; the first level signal is a signal generated when LC resonance exists at the first end of the inductor;
the switch assembly is used for conducting the first end of the inductor and the ground under the action of the input voltage.
2. The negative voltage converter of claim 1, wherein the switching component control circuit comprises: the first switching tube, the second switching tube, the third switching tube and the fourth switching tube;
the control end electricity of first switch tube is connected enable signal, the first end electricity of first switch tube is connected input voltage, the second end electricity of first switch tube is connected switch assembly's control end with the first end of second switch tube, the second end electricity of second switch tube is connected the first end of third switch tube with the control end of fourth switch tube, the control end electricity of third switch tube is connected the first end of fourth switch tube, the second end of third switch tube with the equal electricity of second end of fourth switch tube is connected voltage output end.
3. The negative voltage converter of claim 2, wherein the third terminal of the switching element control circuit is electrically connected to the voltage output terminal;
the switch component control circuit is further configured to disconnect the connection between the input voltage and the control end of the switch component and to connect the control end of the switch component and the voltage output end when the enable signal is a second level signal; wherein the second level signal is a signal generated when there is no LC resonance at the first end of the inductor;
the switch assembly is further used for disconnecting the first end of the inductor from the ground under the action of the output voltage.
4. The negative voltage converter of claim 3, wherein the switching component control circuit further comprises: a fifth switching tube, a sixth switching tube and a phase inverter;
the control end of the fifth switch tube and the input end of the phase inverter are electrically connected with the enable signal, the first end of the fifth switch tube is electrically connected with the input voltage, the second end of the fifth switch tube is electrically connected with the first end of the sixth switch tube, the second end of the sixth switch tube is electrically connected with the first end of the fourth switch tube, and the output end of the phase inverter is electrically connected with the control end of the first switch tube.
5. The negative voltage converter of claim 4, further comprising: a clamp circuit;
the first end of the clamping circuit is electrically connected with the control end of the second switching tube and the control end of the sixth switching tube, and the second end of the clamping circuit is electrically connected with the voltage output end.
6. The negative voltage converter of any one of claims 2-5, wherein the switching assembly comprises: a seventh switching tube and an eighth switching tube;
the first end of the seventh switch tube is electrically connected with the first end of the eighth switch tube, the second end of the seventh switch tube is electrically connected with the first end of the inductor, the second end of the eighth switch tube is grounded, and the control end of the seventh switch tube and the control end of the eighth switch tube are both electrically connected with the second end of the first switch tube.
7. The negative voltage converter of claim 6, wherein the seventh switching tube comprises a first parasitic diode, and the eighth switching tube comprises a second parasitic diode;
the negative electrode of the first parasitic diode is electrically connected with the negative electrode of the second parasitic diode, the positive electrode of the first parasitic diode is electrically connected with the first end of the inductor, and the positive electrode of the second parasitic diode is grounded.
8. The negative voltage converter of any one of claims 2-5, wherein the voltage conversion control circuit comprises: a first control switch and a second control switch;
the first end of the first control switch is electrically connected with the input voltage, the second end of the first control switch is electrically connected with the first end of the second control switch and the first end of the inductor, and the second end of the second control switch is electrically connected with the voltage output end;
the negative voltage converter further includes: the input end of the enable signal generating circuit is electrically connected with the control end of the first control switch and the control end of the second control switch, and the output end of the enable signal generating circuit is electrically connected with the control end of the switch component control circuit;
the enable signal generating circuit is configured to generate the first level signal when the control voltage of the first control switch is a first voltage and the control voltage of the second control switch is a second voltage; the first control switch is in a cut-off state under the action of the first voltage, and the second control switch is in a cut-off state under the action of the second voltage.
9. The negative voltage converter of any one of claims 1-5, further comprising: a first comparator and a control logic circuit;
a first input end of the first comparator is electrically connected with a first end of the inductor, a second input end of the first comparator is electrically connected with the voltage output end, an output end of the first comparator is electrically connected with a first end of the control logic circuit, and a second end of the control logic circuit is electrically connected with a control end of the voltage conversion control circuit;
the first comparator is used for outputting a disconnection control signal when the current of the inductor is 0;
and the control logic circuit is used for disconnecting the second end of the voltage conversion control circuit and the third end of the voltage conversion control circuit based on the disconnection control signal.
10. The negative voltage converter of claim 9, further comprising an error amplifier and a second comparator;
the first input end of the error amplifier is electrically connected with the voltage output end, the second input end of the error amplifier is electrically connected with reference voltage, the output end of the error amplifier is electrically connected with the first input end of the second comparator, the second input end of the second comparator is electrically connected with a triangular wave signal, and the output end of the second comparator is electrically connected with the third end of the control logic circuit;
the error amplifier is used for generating an amplified error voltage based on the reference voltage and an output voltage;
the second comparator is configured to generate a pulse modulation signal based on the amplified error voltage and the triangular wave signal.
11. A semiconductor chip comprising the negative voltage converter of any one of claims 1-10.
CN202211608929.3A 2022-12-14 2022-12-14 Negative voltage converter capable of eliminating resonance and semiconductor chip Pending CN115833574A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211608929.3A CN115833574A (en) 2022-12-14 2022-12-14 Negative voltage converter capable of eliminating resonance and semiconductor chip

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211608929.3A CN115833574A (en) 2022-12-14 2022-12-14 Negative voltage converter capable of eliminating resonance and semiconductor chip

Publications (1)

Publication Number Publication Date
CN115833574A true CN115833574A (en) 2023-03-21

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CN202211608929.3A Pending CN115833574A (en) 2022-12-14 2022-12-14 Negative voltage converter capable of eliminating resonance and semiconductor chip

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Country Link
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