A resonantable negative voltage converter and semiconductor chip

Abstract

The embodiment of the present application provides a negative voltage converter capable of eliminating resonance and a semiconductor chip. The negative voltage converter capable of eliminating resonance comprises a switching component, a switching component control circuit, a voltage conversion control circuit and an inductor; a first end of the voltage conversion control circuit is electrically connected with an input voltage, a second end of the voltage conversion control circuit is electrically connected with a voltage output end of the negative voltage converter, a third end of the voltage conversion control circuit is electrically connected with a first end of the switching component and a first end of the inductor, a second end of the switching component and a second end of the inductor are both grounded, a first end of the switching component control circuit is electrically connected with the input voltage, a second end of the switching component control circuit is electrically connected with a control end of the switching component, and a control end of the switching component control circuit is electrically connected with an enable signal. The negative voltage converter capable of eliminating resonance can eliminate LC resonance in the negative voltage converter.

Description

Technical Field

[0001] This application relates to the field of negative voltage conversion technology, and more particularly to a negative voltage converter and semiconductor chip that can eliminate resonance. Background Technology

[0002] A negative voltage converter can convert an input voltage into a negative output voltage. The input voltage typically comes from a single lithium battery, with the voltage of the battery usually around 4V. The output voltage range is -1V to -6V. When the inductor current in the negative voltage converter is zero, the connection between the inductor and the output terminal of the negative voltage converter can be disconnected to prevent the inductor current from reversing. At this time, the negative voltage converter is in discontinuous conduction mode (DCM).

[0003] In the existing technology, if the load of the negative voltage converter is always relatively large, the inductor current will also be relatively large. During the entire working cycle of the negative voltage converter, the inductor current ripple will not drop below 0A, so it will not trigger other actions. If the load of the negative voltage converter is a medium or light load, the inductor current ripple may drop below 0A, causing the connection between the inductor and the output terminal of the negative voltage converter to be broken. This will cause the residual energy in the inductor to form an LC resonance phenomenon, resulting in a high-frequency ringing waveform.

[0004] However, in some environmentally sensitive applications, the high-frequency ringing waveform in the negative voltage converter can cause electromagnetic interference, which can lead to some application problems. The presence of high-frequency ringing waveform is undesirable. Therefore, there is an urgent need to propose a negative voltage converter that can reduce high-frequency ringing waveform, that is, a negative voltage converter that can eliminate LC resonance. Summary of the Invention

[0005] In view of the above problems, embodiments of this application provide a negative voltage converter and semiconductor chip that can eliminate resonance, thereby eliminating LC resonance in the negative voltage converter.

[0006] In a first aspect, embodiments of this application provide a negative voltage converter capable of eliminating resonance, comprising: a switching component, a switching component control circuit, a voltage conversion control circuit, and an inductor;

[0007] The first terminal of the voltage conversion control circuit is electrically connected to the input voltage, the second terminal of the voltage conversion control circuit is electrically connected to the voltage output terminal of the negative voltage converter, the third terminal of the voltage conversion control circuit is electrically connected to the first terminal of the switching assembly and the first terminal of the inductor, the second terminal of the switching assembly and the second terminal of the inductor are both grounded, the first terminal of the switching assembly control circuit is electrically connected to the input voltage, the second terminal of the switching assembly control circuit is electrically connected to the control terminal of the switching assembly, and the control terminal of the switching assembly control circuit is electrically connected to the enable signal.

[0008] The switching component control circuit is used to turn on the input voltage and the control terminal of the switching component when the enable signal is a first level signal; wherein, the first level signal is a signal generated when there is LC resonance at the first end of the inductor;

[0009] The switching assembly is used to connect the first terminal of the inductor to ground under the action of the input voltage.

[0010] In some embodiments, the switching component control circuit includes: a first switching transistor, a second switching transistor, a third switching transistor, and a fourth switching transistor;

[0011] The control terminal of the first switch is electrically connected to the enable signal, the first terminal of the first switch is electrically connected to the input voltage, the second terminal of the first switch is electrically connected to the control terminal of the switch assembly and the first terminal of the second switch, the second terminal of the second switch is electrically connected to the first terminal of the third switch and the control terminal of the fourth switch, the control terminal of the third switch is electrically connected to the first terminal of the fourth switch, and the second terminals of both the third and fourth switches are electrically connected to the voltage output terminal.

[0012] In some embodiments, the third terminal of the switch assembly control circuit is electrically connected to the voltage output terminal;

[0013] The switching component control circuit is further configured to disconnect the connection between the input voltage and the control terminal of the switching component when the enable signal is a second level signal, and to connect the control terminal of the switching component and the voltage output terminal; wherein, the second level signal is a signal generated when there is no LC resonance at the first terminal of the inductor;

[0014] The switching assembly is also used to disconnect the connection between the first terminal of the inductor and ground under the action of the output voltage.

[0015] In some embodiments, the switching component control circuit further includes: a fifth switching transistor, a sixth switching transistor, and an inverter;

[0016] The control terminal of the fifth switch and the input terminal of the inverter are both electrically connected to the enable signal. The first terminal of the fifth switch is electrically connected to the input voltage. The second terminal of the fifth switch is electrically connected to the first terminal of the sixth switch. The second terminal of the sixth switch is electrically connected to the first terminal of the fourth switch. The output terminal of the inverter is electrically connected to the control terminal of the first switch.

[0017] In some embodiments, the resonant-eliminating negative voltage converter further includes: a clamping circuit;

[0018] The first terminal of the clamping circuit is electrically connected to the control terminal of the second switch and the control terminal of the sixth switch, and the second terminal of the clamping circuit is electrically connected to the voltage output terminal.

[0019] In some embodiments, the switching assembly includes a seventh switching transistor and an eighth switching transistor;

[0020] The first terminal of the seventh switch is electrically connected to the first terminal of the eighth switch, the second terminal of the seventh switch is electrically connected to the first terminal of the inductor, the second terminal of the eighth switch is grounded, and the control terminals of the seventh and eighth switches are both electrically connected to the second terminal of the first switch.

[0021] In some embodiments, the seventh switch includes a first parasitic diode, and the eighth switch includes a second parasitic diode;

[0022] The negative terminal of the first parasitic diode is electrically connected to the negative terminal of the second parasitic diode, the positive terminal of the first parasitic diode is electrically connected to the first terminal of the inductor, and the positive terminal of the second parasitic diode is grounded.

[0023] In some embodiments, the voltage conversion control circuit includes: a first control switch and a second control switch;

[0024] The first terminal of the first control switch is electrically connected to the input voltage, the second terminal of the first control switch is electrically connected to the first terminal of the second control switch and the first terminal of the inductor, and the second terminal of the second control switch is electrically connected to the voltage output terminal;

[0025] The negative voltage converter further includes an enable signal generation circuit, wherein the input terminal of the enable signal generation circuit is electrically connected to the control terminal of the first control switch and the control terminal of the second control switch, and the output terminal of the enable signal generation circuit is electrically connected to the control terminal of the switch assembly control circuit.

[0026] The enable signal generation circuit is used 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; wherein, under the action of the first voltage, the first control switch is in the off state, and under the action of the second voltage, the second control switch is in the off state.

[0027] In some embodiments, the resonant-eliminating negative voltage converter further includes: a first comparator and control logic circuitry;

[0028] The first input terminal of the first comparator is electrically connected to the first terminal of the inductor, the second input terminal of the first comparator is electrically connected to the voltage output terminal, the output terminal of the first comparator is electrically connected to the first terminal of the control logic circuit, and the second terminal of the control logic circuit is electrically connected to the control terminal of the voltage conversion control circuit.

[0029] The first comparator is configured to output a disconnect control signal when the current in the inductor is 0.

[0030] The control logic circuit is used to disconnect the second terminal and the third terminal of the voltage conversion control circuit based on the disconnection control signal.

[0031] In some embodiments, the resonant-eliminating negative voltage converter further includes an error amplifier and a second comparator;

[0032] The first input terminal of the error amplifier is electrically connected to the voltage output terminal, the second input terminal of the error amplifier is electrically connected to the reference voltage, the output terminal of the error amplifier is electrically connected to the first input terminal of the second comparator, the second input terminal of the second comparator is electrically connected to the triangular wave signal, and the output terminal of the second comparator is electrically connected to the third terminal of the control logic circuit.

[0033] The error amplifier is used to generate an amplified error voltage based on the reference voltage and the output voltage;

[0034] The second comparator is used to generate a pulse modulation signal based on the amplified error voltage and the triangular wave signal.

[0035] Secondly, embodiments of this application provide a semiconductor chip, including: any of the resonant-eliminating negative voltage converters provided in the first aspect.

[0036] In the technical solution of this application embodiment, the resonant-eliminating negative voltage converter includes a switching component, a switching component control circuit, a voltage conversion control circuit, and an inductor. The first terminal of the voltage conversion control circuit is electrically connected to the input voltage, the second terminal is electrically connected to the voltage output terminal of the negative voltage converter, and the third terminal is electrically connected to the first terminal of the switching component and the first terminal of the inductor. The second terminals of both the switching component and the inductor are grounded. The first terminal of the switching component control circuit is electrically connected to the input voltage, the second terminal is electrically connected to the control terminal of the switching component, and the control terminal is electrically connected to an enable signal. The switching component control circuit can conduct the input voltage and the control terminal of the switching component when the enable signal is a first-level signal. The first-level signal is the signal generated when LC resonance exists at the first terminal of the inductor. Under the action of the input voltage, the switching component can conduct the first terminal of the inductor to ground. Thus, the residual energy in the inductor forms a low-resistance path to ground through the switching component, and all the residual energy in the inductor is discharged to the ground, preventing significant LC resonance and eliminating LC resonance in the negative voltage converter.

[0037] The above description is merely an overview of the technical solutions of the embodiments of this application. In order to better understand the technical means of the embodiments of this application and to implement them in accordance with the contents of the specification, and to make the above and other objects, features and advantages of the embodiments of this application more obvious and understandable, specific implementation methods of this application are described below. Attached Figure Description

[0038] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1A A timing diagram of a heavy-load negative voltage converter provided for an embodiment of this application;

[0040] Figure 1B A timing diagram of a low-to-medium load negative voltage converter provided for an embodiment of this application;

[0041] Figure 2 A schematic diagram of a negative voltage converter capable of eliminating resonance is provided in an embodiment of this application;

[0042] Figure 3 A partial structural schematic diagram of a negative voltage converter capable of eliminating resonance, provided for an embodiment of this application;

[0043] Figure 4 for Figure 3 The diagram shows the equivalent circuit of a negative voltage converter that can eliminate resonance under the first level signal.

[0044] Figure 5 A partial structural schematic diagram of another resonant-eliminating negative voltage converter provided in an embodiment of this application;

[0045] Figure 6 for Figure 5 The diagram shows the equivalent circuit of a resonant-eliminating negative voltage converter under the second-level signal.

[0046] Figure 7 A schematic diagram of another resonant-eliminating negative voltage converter provided in an embodiment of this application;

[0047] Figure 8 This is a schematic diagram of another negative voltage converter capable of eliminating resonance, provided as an embodiment of this application. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0049] Unless otherwise defined, 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 pertains; the terminology used herein in the specification of the application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims and drawings of this application are intended to cover non-exclusive inclusion.

[0050] The term "embodiment" as used herein means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of the phrase "embodiment" in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0051] Furthermore, the terms "first," "second," etc., in the specification and claims of this application or in the aforementioned drawings are used to distinguish different objects rather than to describe a specific order, and may explicitly or implicitly include one or more of the features.

[0052] In the description of this application, unless otherwise expressly specified and limited, the terms "connected" and "connected" shall be interpreted broadly. For example, "connected" or "connected" in circuit structure can refer not only to physical connection, but also to electrical connection or signal connection. For example, it can be a direct connection, i.e., a physical connection, or an indirect connection through at least one intermediate element, as long as the circuit is connected. It can also refer to the internal connection of two elements. Signal connection can refer not only to signal connection through circuit, but also to signal connection through a medium, such as radio waves.

[0053] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.

[0054] Figure 1A A timing diagram of a heavy-load negative voltage converter provided in an embodiment of this application. Figure 1B A timing diagram of a low-to-medium load negative voltage converter provided in an embodiment of this application is shown below. Figure 1A and Figure 1B As shown, GHS is the control voltage of the upper switch in the negative voltage converter, IL is the inductor current in the negative voltage converter, ZCD is the control signal of the lower switch generated by the negative voltage converter based on the inductor current IL, and SW is the voltage signal at the connection point A of the inductor, the upper switch and the lower switch.

[0055] If the load of the negative voltage converter is a heavy load, such as Figure 1A As shown, when the control voltage GHS of the upper switching transistor is high, the inductor current IL continuously increases, and the voltage signal SW at connection point A remains at a high level. When the control voltage GHS of the upper switching transistor is low, the inductor current IL gradually decreases. Throughout the increase and decrease of the inductor current IL, it remains greater than 0A, and the voltage signal SW at connection point A remains at a low level. Thus, throughout the entire operating cycle, the inductor current IL remains relatively large, and the ripple of the inductor current IL will not decrease below 0A. Therefore, the control signal ZCD of the lower switching transistor remains 0, and no other actions are triggered.

[0056] If the load of the negative voltage converter is a medium to light load, such as Figure 1BAs shown, when the control voltage GHS of the upper switch is pulled high, the inductor current IL continues to increase, and the voltage signal SW at connection point A remains at a high level. When the control voltage GHS of the upper switch is pulled low, the inductor current IL gradually decreases until it drops to 0A and remains at 0A. Before the inductor current IL drops to 0A, the voltage signal SW at connection point A remains at a low level. When the inductor current IL drops to 0A, the control signal ZCD of the lower switch is pulled high, that is, the lower switch is turned off. The residual energy in the inductor L and the parasitic capacitance at connection point A will form an LC resonance phenomenon. At this time, the voltage signal SW at connection point A is the LC resonance signal, that is, a high-frequency ringing waveform appears.

[0057] In some environmentally sensitive applications, high-frequency ringing waveforms can introduce unwanted electromagnetic interference, leading to application problems. For example, in display applications, electromagnetic interference from high-frequency ringing waveforms can affect display performance. Therefore, there is an urgent need to develop a negative voltage converter that can eliminate LC resonance.

[0058] Figure 2 This is a schematic diagram of a negative voltage converter capable of eliminating resonance, provided as an embodiment of this application. Figure 2 As shown, the resonant-eliminating negative voltage converter 100 includes: a switching assembly 110, a switching assembly control circuit 120, a voltage conversion control circuit 130, and an inductor L.

[0059] Specifically, the first terminal of the voltage conversion control circuit 130 is electrically connected to the input voltage Vin, the second terminal of the voltage conversion control circuit 130 is electrically connected to the voltage output terminal OUT of the negative voltage converter 100 that can eliminate resonance, 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 terminal of the switch assembly 110 and the second terminal of the inductor L are both grounded, the first terminal of the switch assembly control circuit 120 is electrically connected to the input voltage Vin, the second terminal of the switch assembly control circuit 120 is electrically connected to the control terminal of the switch assembly 110, and the control terminal of the switch assembly control circuit 120 is electrically connected to the enable signal EN.

[0060] The switching component control circuit 120 is used to turn on the input voltage Vin and the control terminal of the switching component 110 when the enable signal EN is a first-level signal; wherein, the first-level signal is the signal generated when there is LC resonance at the first end of the inductor L. The switching component 110 is used to connect the first end of the inductor L to ground under the action of the input voltage Vin.

[0061] For example, such as Figure 2As shown, the voltage conversion control circuit 130 includes: a first control switch MHS and a second control switch MLS. The first terminal of the first control switch MHS is electrically connected to the input voltage Vin. 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. The second terminal of the second control switch MLS is electrically connected to the voltage output terminal OUT.

[0062] like Figure 2 As shown, 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 therefore 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 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 that can eliminate resonance, and therefore the second terminal of the voltage conversion control circuit 130 is electrically connected to the voltage output terminal OUT. The connection point between the second terminal of the first control switch MHS and the first terminal of the second control switch MLS is the 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 therefore 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.

[0063] The second terminal of inductor L and the upper plate of output capacitor Cout are grounded, and the lower plate of output capacitor Cout is electrically connected to the voltage output terminal OUT. If the first control switch MHS is on and the second control switch MLS is off, the input voltage Vin can be connected to the first terminal of inductor L. The current flows from the input voltage Vin through inductor L to ground, and from the first terminal of inductor L to the second terminal. Inductor L can store energy, i.e., it is in a charging state. If the first control switch MHS is off and the second control switch MLS is on, the first terminal of inductor L and the power output terminal OUT can be connected. Since the current direction of inductor L cannot change abruptly, the current direction of inductor L is still from the first terminal to the second terminal, i.e., the current flows from the voltage output terminal OUT through inductor L to ground. In this way, the lower plate of output capacitor Cout is discharged, and a negative voltage, Vout, can be output at the voltage output terminal OUT.

[0064] See also Figure 2The switching component control circuit 120 can receive an enable signal EN. When there is LC resonance at the first end of the inductor L, the received enable signal EN is a first-level signal, for example, a low-level signal. Under the action of the first-level signal, the switching component control circuit 120 can turn on its first and second terminals. Since the first terminal of the switching component control circuit 120 is electrically connected to the input voltage Vin, and the second terminal of the switching component control circuit 120 is electrically connected to the control terminal of the switching component 110, under the action of the first-level signal, the switching component control circuit 120 can turn on the input voltage Vin and the control terminal of the switching component 110, that is, it can provide the input voltage Vin to the control terminal of the switching component 110.

[0065] Under the influence of the input voltage Vin, the switching assembly 110 can conduct both its first and second terminals. Since the first terminal of the switching assembly 110 is electrically connected to the first terminal of the inductor L, and the second terminal of the switching assembly 110 is grounded, under the influence of the input voltage Vin, the switching assembly 110 can conduct the first terminal of the inductor L to ground.

[0066] In summary, when LC resonance exists at the first terminal of inductor L, the switch component control circuit 120 can conduct the input voltage Vin and the control terminal of switch component 110, thereby conducting the first and second terminals of switch component 110, and consequently connecting the first terminal of inductor L to ground. Thus, the residual energy in inductor L forms a low-resistance path to ground through switch component 110, and all the residual energy in inductor L is discharged to the ground, preventing significant LC resonance and effectively eliminating LC resonance.

[0067] In this embodiment, the resonant-eliminating negative voltage converter includes a switching component, a switching component control circuit, a voltage conversion control circuit, and an inductor. The first terminal of the voltage conversion control circuit is electrically connected to the input voltage, the second terminal is electrically connected to the voltage output terminal of the negative voltage converter, and the third terminal is electrically connected to the first terminal of the switching component and the first terminal of the inductor. The second terminals of both the switching component and the inductor are grounded. The first terminal of the switching component control circuit is electrically connected to the input voltage, and the second terminal is electrically connected to the control terminal of the switching component. The control terminal of the switching component control circuit is electrically connected to an enable signal. When the enable signal is a first-level signal, the switching component control circuit can conduct the input voltage and the control terminal of the switching component. The first-level signal is the signal generated when LC resonance exists at the first terminal of the inductor. Under the action of the input voltage, the switching component can conduct the first terminal of the inductor to ground. Thus, the residual energy in the inductor forms a low-resistance path to ground through the switching component, and all the residual energy in the inductor is discharged to the ground, preventing significant LC resonance and eliminating LC resonance in the negative voltage converter.

[0068] In some implementations, Figure 3 This is a partial structural schematic diagram of a negative voltage converter capable of eliminating resonance, provided in an embodiment of this application. Figure 3 for Figure 2 Based on the embodiment shown, the switch component control circuit 120 includes: a first switch Q1, a second switch Q2, a third switch Q3, and a fourth switch Q4.

[0069] Specifically, the control terminal of the first switch Q1 is electrically connected to the enable signal EN, the first terminal of the first switch Q1 is electrically connected to the input voltage Vin, the second terminal of the first switch Q1 is electrically connected to the control terminal of the switch assembly 110 and the first terminal of the second switch Q2, the second terminal of the second switch Q2 is electrically connected to the first terminal of the third switch Q3 and the control terminal of the fourth switch Q4, the control terminal of the third switch Q3 is electrically connected to the first terminal of the fourth switch Q4, and the second terminals of the third switch Q3 and the fourth switch Q4 are both electrically connected to the voltage output terminal OUT.

[0070] For example, Figure 4 for Figure 3 The equivalent circuit diagram of the resonant-eliminating negative voltage converter shown is as follows: Figure 4 As shown, if the enable signal EN is a first-level signal, the first switch Q1 can receive the first-level signal, and under the action of the first-level signal, the two ends of the first switch Q1 are turned on. The first end of the first switch Q1 is electrically connected to the input voltage Vin, and the second end of the first switch Q1 is electrically connected to the first end of the second switch Q2, so the input voltage Vin and the first end of the second switch Q2 are turned on.

[0071] The control terminal of the second switching transistor Q2 is electrically connected to the clamping voltage V. CLP At clamping voltage V CLP Under the influence of the input voltage Vin, the two ends of the second switch Q2 are turned on. The second end of the second switch Q2 is electrically connected to the control terminal of the fourth switch Q4, so the input voltage Vin is connected to the control terminal of the fourth switch Q4, that is, the voltage Vin is input to the control terminal of the fourth switch Q4. Under the influence of the input voltage Vin, the two ends of the fourth switch Q4 are turned on. Since the first end of the fourth switch Q4 is electrically connected to the control terminal of the third switch Q3, and the second end of the fourth switch Q4 is electrically connected to the voltage output terminal OUT, the control terminal of the third switch Q3 is connected to the negative output voltage Vout, that is, the negative output voltage Vout is provided to the control terminal of the third switch Q3.

[0072] Under the influence of the negative output voltage Vout, the two ends of the third switch Q3 are disconnected. Since the first end of the third switch Q3 is electrically connected to the second end of the second switch Q2, and the second end of the third switch Q3 is electrically connected to the voltage output terminal OUT, the second end of the second switch Q2 is disconnected from the output voltage Vout.

[0073] In summary, if the enable signal EN is a first-level signal, the switching component control circuit 120 can conduct the input voltage Vin to the first terminal of the second switching transistor Q2 and disconnect the connection between the first terminal of the second switching transistor Q2 and the output voltage Vout. Furthermore, the first terminal of the second switching transistor Q2 is electrically connected to the control terminal of the switching component 110. Therefore, the voltage at the control terminal of the switching component 110 can be pulled up to the input voltage Vin, thereby conducting the two ends of the switching component 110, and consequently connecting the first terminal of the inductor L to ground.

[0074] In some implementations, see also Figure 2 and Figure 3 The third terminal of the switch component control circuit 120 is electrically connected to the voltage output terminal Vout.

[0075] The switch assembly control circuit 120 is further configured to disconnect the connection between the input voltage Vin and the control terminal of the switch assembly 110 when the enable signal EN is a second-level signal, and to connect the control terminal and the voltage output terminal OUT of the switch assembly 110; wherein, the second-level signal is the signal generated when there is no LC resonance at the first terminal of the inductor L. The switch assembly 110 is further configured to disconnect the connection between the first terminal of the inductor L and ground under the action of the output voltage.

[0076] For example, when there is no LC resonance at the first end of inductor L, the enable signal EN received by the switch component control circuit 120 is a second-level signal, for example, a low-level signal. Under the action of the second-level signal, the switch component control circuit 120 can disconnect the connection between the first and second ends of the switch component control circuit 120, while simultaneously turning on the third and second ends of the switch component control circuit 120. Since the third end of the switch component control circuit 120 is electrically connected to the output voltage Vout, under the action of the second-level signal, the switch component control circuit 120 can turn on the output voltage Vout and the control terminal of the switch component 110, and disconnect the connection between the input voltage Vin and the control terminal of the switch component 110, that is, it can provide the output voltage Vout to the control terminal of the switch component 110.

[0077] Under the action of the output voltage Vout, the switching component 110 can disconnect the connection between its first and second terminals, i.e., disconnect the first terminal of inductor L from ground. Thus, when there is no LC resonance at the first terminal of inductor L, the switching component control circuit 120 can disconnect the input voltage Vin and the control terminal of switching component 110 while connecting the output voltage Vout and the control terminal of switching component 110. This disconnects the connection between the first and second terminals of switching component 110, and further disconnects the direct connection between the first terminal of inductor L and ground, allowing energy at the first terminal of inductor L to flow to ground through inductor L.

[0078] In some implementations, Figure 5 The schematic diagram of a partial structure of another resonant-eliminating negative voltage converter provided in this application embodiment shows that the switching component control circuit 120 further includes: a fifth switch Q5, a sixth switch Q6, and an inverter 121.

[0079] The control terminal of the fifth switch Q5 and the input terminal of the inverter 121 are both electrically connected to the enable signal EN. The first terminal of the fifth switch Q5 is electrically connected to the input voltage Vin. The second terminal of the fifth switch Q5 is electrically connected to the first terminal of the sixth switch Q6. The second terminal of the sixth switch Q6 is electrically connected to the first terminal of the fourth switch Q4. The output terminal of the inverter 121 is electrically connected to the control terminal of the first switch Q1.

[0080] For example, Figure 6 for Figure 5 The diagram shown is an equivalent circuit diagram of a resonant-eliminating negative voltage converter under the second-level signal, as follows: Figure 6As shown, if the enable signal EN is a second-level signal, the inverter 121 can receive the second-level signal, invert it, and output it to the control terminal of the first switch Q1. Under the action of the inverted second-level signal, the two ends of the first switch Q1 are disconnected, that is, the connection between the input voltage Vin and the control terminal of the switching assembly 110 is broken. For example, if the second-level signal is a low-level signal, the inverter 121 converts the low-level signal to a high-level signal. Under the action of the high-level signal, the two ends of the first switch Q1 are disconnected.

[0081] The fifth switch Q5 can receive a second-level signal. Under the action of the second-level signal, the two ends of the fifth switch Q5 are turned on. The first end of the fifth switch Q5 is electrically connected to the input voltage Vin, and the second end of the fifth switch Q5 is electrically connected to the first end of the sixth switch Q6. Thus, the input voltage Vin and the first end of the sixth switch Q6 are turned on.

[0082] The control terminal of the sixth switching transistor Q6 is electrically connected to the clamping voltage V. CLP At clamping voltage V CLP Under the influence of the input voltage Vin, the sixth switch Q6 is turned on. The second terminal of the sixth switch Q6 is electrically connected to the control terminal of the third switch Q3, thus the input voltage Vin is connected to the control terminal of the third switch Q3, meaning a voltage Vin is input to the control terminal of the third switch Q3. Under the influence of the input voltage Vin, the third switch Q3 is turned on. Since the first terminal of the third switch Q3 is electrically connected to the control terminal of the fourth switch Q4, and the second terminal of the third switch Q3 is electrically connected to the voltage output terminal OUT, the control terminal of the fourth switch Q4 is connected to the negative output voltage Vout, meaning a negative output voltage Vout is provided to the control terminal of the third switch Q3.

[0083] Under the influence of the negative output voltage Vout, the fourth switch Q4 is disconnected, thus breaking the electrical connection between the output voltage Vout and the first terminal of the fourth switch Q4. The second terminal of the sixth switch Q6 is electrically connected to the first terminal of the fourth switch Q4, and the sixth switch Q6 is turned on. Therefore, the input voltage Vin is turned on by the first terminal of the fourth switch Q4. Consequently, the voltage at the first terminal of the fourth switch Q4 is pulled up to the input voltage Vin, meaning the voltage at the control terminal of the third switch Q3 is also pulled up to the input voltage Vin.

[0084] Under the influence of the input voltage Vin, the third switch Q3 is turned on, which in turn turns on the second terminal of the second switch Q2 and the output voltage Vout; in addition, under the clamping voltage V CLP Under the action of the second switch Q2, the two ends of the second switch Q2 are turned on, which can turn on the output voltage Vout and the second end of the second switch Q2, that is, turn on the output voltage Vout and the control terminal of the switch assembly 110.

[0085] In summary, if the enable signal EN is a second-level signal, the connection between the input voltage Vin and the first terminal of the second switch Q2 can be disconnected through the switch component control circuit 120, and the first terminal of the second switch Q2 and the output voltage Vout can be turned on, which can pull the voltage of the control terminal of the switch component 110 down to the output voltage Vout, thereby disconnecting the first terminal and the second terminal of the switch component 110, and then disconnecting the connection between the first terminal of the inductor L and ground.

[0086] In some embodiments, the clamping voltage V CLP This can be generated by clamping circuit 140, such as Figure 3 and Figure 5 As shown, the negative voltage converter 100 that can eliminate resonance also includes a clamping circuit 140. The first terminal of the clamping circuit 140 is electrically connected to the control terminal of the second switch Q2 and the control terminal of the sixth switch Q6, and the second terminal of the clamping circuit 140 is electrically connected to the voltage output terminal OUT.

[0087] For example, such as Figure 3 and Figure 5 As shown, the clamping circuit 140 includes a resistor Rs and a clamping switch DZ. The first terminal of resistor Rs is electrically connected to the input voltage Vin. The second terminal of resistor Rs is electrically connected to the negative terminal of the clamping switch DZ, the control terminal of the second switch Q2, and the control terminal of the sixth switch Q6. The positive terminal of the clamping switch DZ is electrically connected to the voltage output terminal Vout. Thus, the negative voltage of the clamping switch DZ is the clamping voltage V. CLP The positive voltage of the clamping switch transistor DZ is Vout.

[0088] The clamping switch DZ can be, for example, a Zener diode. A reverse voltage is applied across the Zener diode, and its reverse breakdown voltage is 5.5V. Therefore, V... CLP -Vout = 5.5V. The threshold voltages of the second switch Q2 and the sixth switch Q6 are generally about 0.7V. Therefore, the maximum voltage difference between the control terminal of the third switch Q3 and the second terminal is 5.5V - 0.7V = 4.8V, and the maximum voltage difference between the control terminal of the fourth switch Q4 and the second terminal is 4.8V. Thus, both the third switch Q3 and the fourth switch Q4 can be made of commonly used 5V semiconductor devices.

[0089] It should be noted that, Figure 3 and Figure 5 The clamping circuit 140 shown is only an example of a resistor Rs and a clamping switch DZ. In other embodiments, the resistor Rs may be replaced with a current source Ib.

[0090] In some embodiments, see Figures 3 to 6As shown, the switching assembly 110 includes a seventh switch Q7 and an eighth switch Q8, wherein the first terminal of the seventh switch Q7 is electrically connected to the first terminal of the eighth switch Q8, the second terminal of the seventh switch Q7 is electrically connected to the first terminal of the inductor L, the second terminal of the eighth switch Q8 is grounded, and the control terminals of the seventh switch Q7 and the eighth switch Q8 are both electrically connected to the second terminal of the first switch Q1.

[0091] For example, such as Figures 3 to 6 As shown, the second terminal of the seventh switch Q7 is the first terminal of the switching assembly 110, and the second terminal of the eighth switch Q8 is also the second terminal of the switching assembly 110. Thus, the first terminal of the inductor L is grounded sequentially through the seventh switch Q7 and the eighth switch Q8. The control terminals of both the seventh switch Q7 and the eighth switch Q8 are control terminals of the switching assembly 110. If the second terminal of the first switch Q1 is connected to the input voltage Vin, then the voltage at the control terminals of both the seventh switch Q7 and the eighth switch Q8 is pulled high to the input voltage Vin. At this time, both the seventh switch Q7 and the eighth switch Q8 are turned on. Figure 4 As shown, the energy remaining at the first end of the inductor L flows to ground sequentially through the seventh switch Q7 and the eighth switch Q8.

[0092] If the second terminal of the first switch Q1 is turned on with the output voltage Vout, then the voltage at the control terminal of the seventh switch Q7 and the control terminal of the eighth switch Q8 are both pulled down to the output voltage Vout. At this time, both the seventh switch Q7 and the eighth switch Q8 are turned off. Figure 6 As shown, the energy at the first end of inductor L flows to ground through inductor L.

[0093] In some embodiments, see Figures 3 to 6 As shown, the seventh switch Q7 includes a first parasitic diode D1, and the eighth switch Q8 includes a second parasitic diode D2. The negative terminal of the first parasitic diode D1 is electrically connected to the negative terminal of the second parasitic diode D2, the positive terminal of the first parasitic diode D1 is electrically connected to the first terminal of the inductor L, and the positive terminal of the second parasitic diode D2 is grounded.

[0094] For example, during the charging process of inductor L, the voltage at the first terminal of inductor L gradually increases. The positive terminal of the first parasitic diode D1 is electrically connected to the first terminal of inductor L, thus increasing the voltage at the positive terminal of the first parasitic diode D1, causing it to conduct. However, the positive terminal of the second parasitic diode D2 is grounded, and the negative terminal of the second parasitic diode D2 is electrically connected to the negative terminal of the first parasitic diode D1. Therefore, the voltage at the negative terminal of the second parasitic diode D2 is higher than the voltage at the positive terminal, causing it to disconnect. This prevents the energy stored in inductor L from being released to ground during charging, ensuring the normal operation of the resonant-eliminating negative voltage converter.

[0095] In some embodiments, Figure 7 This is a schematic diagram of another resonant-eliminating negative voltage converter provided in an embodiment of this application. Figure 7 for Figure 2 Based on the embodiment shown, the resonant-eliminating negative voltage converter 100 further includes an enable signal generation circuit 150, wherein the input terminal of the enable signal generation 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 the output terminal of the enable signal generation circuit 150 is electrically connected to the control terminal of the switch assembly control circuit 120.

[0096] The enable signal generation circuit 150 is used to generate a first level signal when the control voltage of the first control switch MHS is a first voltage and the control voltage of the second control switch MLS is a second voltage; wherein, under the action of the first voltage, the first control switch MHS is in the off state, and under the action of the second voltage, the second control switch MLS is in the off state.

[0097] For example, when the first voltage is high and the second voltage is low, the first control switch MHS is turned on under the high voltage and the second control switch MLS is turned off under the low voltage. The enable signal generation circuit 150 can receive the first and second voltages. When the first voltage is high and the second voltage is low, the generated enable signal EN is a first-level signal. Under the action of the first-level signal, the first terminal and the second terminal of the switch component control circuit 120 are connected.

[0098] It should be noted that, in this embodiment, only the first switch Q1, the fifth switch Q5, and the first control switch MHS are PMOS transistors, and the second switch Q2, the third switch Q3, the fourth switch Q4, the sixth switch Q6, the seventh switch Q7, the eighth switch Q8, and the second control switch MLS are NMOS transistors. In other embodiments, the first switch Q1, the fifth switch Q5, and the first control switch MHS can be NMOS transistors, and the second switch Q2, the third switch Q3, the fourth switch Q4, the sixth switch Q6, the seventh switch Q7, the eighth switch Q8, and the second control switch MLS can be PMOS transistors.

[0099] In some embodiments, Figure 8 This is a schematic diagram of another resonant-eliminating negative voltage converter provided in an embodiment of this application. Figure 8 for Figure 2 Based on the embodiment shown, the resonant-eliminating negative voltage converter 100 further includes a first comparator COMP1 and a control logic circuit 160.

[0100] The first input terminal of the first comparator COMP1 is electrically connected to the first terminal of the inductor L, the second input terminal of the first comparator COMP1 is electrically connected to the voltage output terminal OUT, the output terminal of the first comparator COMP1 is electrically connected to the first terminal of the control logic circuit 160, and the second terminal of the control logic circuit 160 is electrically connected to the control terminal of the voltage conversion control circuit 130.

[0101] The first comparator COMP1 outputs a disconnect control signal when the current in inductor L is 0. The control logic circuit 160 disconnects the connection between the second and third terminals of the voltage conversion control circuit 130 based on the disconnect control signal.

[0102] For example, such as Figure 8 As shown, the first comparator COMP1 can receive the inductor current IL and output a positive pulse signal, i.e., a disconnection control signal, when the inductor current IL is 0A. The control logic circuit 160 can receive this disconnection control signal and control the two ends of the second control switch MLS to disconnect based on the disconnection control signal, i.e., control the second and third ends of the voltage conversion control circuit 130 to disconnect, thereby preventing the inductor current IL from reversing.

[0103] In some embodiments, see continue to see Figure 8 The resonant-eliminating negative voltage converter 100 also includes an error amplifier EA and a second comparator COMP2.

[0104] Specifically, the first input terminal of the error amplifier EA is electrically connected to the voltage output terminal OUT, the second input terminal of the error amplifier EA is electrically connected to the reference voltage Vset, the output terminal of the error amplifier EA is electrically connected to the first input terminal of the second comparator COMP2, the second input terminal of the second comparator COMP2 is electrically connected to the triangular wave signal Vramp, and the output terminal of the second comparator COMP2 is electrically connected to the third terminal of the control logic circuit 130.

[0105] Error amplifier EA is used to generate an amplified error voltage V based on the reference voltage Vset and the output voltage Vout. EA The second comparator, COMP2, is used to base the amplified error voltage V. EA The triangular wave signal Vramp generates a pulse modulation signal PWM.

[0106] For example, as the output voltage Vout gradually becomes negative, it is fed back into the error amplifier EA. The error amplifier EA uses the reference voltage Vset as a reference voltage to determine the error voltage Vout-Vset between the output voltage Vout and the reference voltage. This error voltage Vout-Vset is then amplified to obtain the amplified error voltage V between the output voltage Vout and the reference voltage.EA The second comparator COMP2 can receive the amplified error voltage V. EA And based on the amplified error voltage V EA The difference between the signal and the triangular wave signal Vramp generates a pulse modulation signal PWM. The pulse modulation signal PWM can control the duty cycle of the first control switch MHS and the second control switch MLS, thereby regulating the output voltage Vout.

[0107] For example, when the output voltage Vout is lower than the reference voltage Vset, the amplified error voltage V output by the error amplifier EA will be... EA The lowering of the duty cycle of the pulse modulation signal (PWM) output by the second comparator COMP2 causes the duty cycle of the PWM signal to decrease, thereby increasing the output voltage Vout to reach a feedback equilibrium point and thus obtaining a relatively stable output voltage Vout.

[0108] This application also provides a semiconductor chip, which includes the resonant-eliminating negative voltage converter 100 provided in any of the above embodiments.

[0109] For example, integrating the resonant-eliminating negative voltage converter 100 provided in any of the above embodiments into a semiconductor chip can reduce the size of the resonant-eliminating negative voltage converter 100, which is beneficial to the miniaturization of the resonant-eliminating negative voltage converter 100.

[0110] The semiconductor chip provided in this application includes the resonant-eliminating negative voltage converter 100 provided in any of the above embodiments, and has the same functional modules and beneficial effects as the resonant-eliminating negative voltage converter 100, which will not be described again here.

[0111] The above-disclosed embodiments are merely specific examples of this application. However, the embodiments of this application are not limited thereto, and any variations that can be conceived by those skilled in the art should fall within the protection scope of this application.

[0112] The term "comprising" as used in this application does not exclude the presence of elements or steps not listed in the claims. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. This application can be implemented by means of hardware comprising several different elements and by means of a suitably programmed computer. In the unit claims listing several means, several units of these means may be embodied by the same item of hardware. The use of "first," "second," and "third," etc., does not indicate any order and should be interpreted as names. Unless otherwise specified, the steps in the above embodiments should not be construed as limiting the order of execution.

[0113] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A negative voltage converter capable of eliminating resonance, characterized in that, include: Switching components, switching component control circuits, voltage conversion control circuits, and inductors; The first terminal of the voltage conversion control circuit is electrically connected to the input voltage, the second terminal of the voltage conversion control circuit is electrically connected to the voltage output terminal of the negative voltage converter, the third terminal of the voltage conversion control circuit is electrically connected to the first terminal of the switching assembly and the first terminal of the inductor, the second terminal of the switching assembly and the second terminal of the inductor are both grounded, the first terminal of the switching assembly control circuit is electrically connected to the input voltage, the second terminal of the switching assembly control circuit is electrically connected to the control terminal of the switching assembly, and the control terminal of the switching assembly control circuit is electrically connected to the enable signal. The switching component control circuit is used to turn on the input voltage and the control terminal of the switching component when the enable signal is a first level signal; wherein, the first level signal is a signal generated when there is LC resonance at the first end of the inductor; The switching assembly is used to connect the first terminal of the inductor to ground under the action of the input voltage; The switching component control circuit includes: a first switching transistor, a second switching transistor, a third switching transistor, and a fourth switching transistor; The control terminal of the first switch is electrically connected to the enable signal, the first terminal of the first switch is electrically connected to the input voltage, the second terminal of the first switch is electrically connected to the control terminal of the switch assembly and the first terminal of the second switch, the second terminal of the second switch is electrically connected to the first terminal of the third switch and the control terminal of the fourth switch, the control terminal of the third switch is electrically connected to the first terminal of the fourth switch, and the second terminals of both the third and fourth switches are electrically connected to the voltage output terminal.

2. The negative voltage converter according to claim 1, characterized in that, The third terminal of the control circuit of the switching assembly is electrically connected to the voltage output terminal; The switching component control circuit is further configured to disconnect the connection between the input voltage and the control terminal of the switching component when the enable signal is a second level signal, and to connect the control terminal of the switching component and the voltage output terminal; wherein, the second level signal is a signal generated when there is no LC resonance at the first terminal of the inductor; The switching assembly is also used to disconnect the connection between the first terminal of the inductor and ground under the action of the output voltage.

3. The negative voltage converter according to claim 2, characterized in that, The switching assembly control circuit further includes: a fifth switching transistor, a sixth switching transistor, and an inverter; The control terminal of the fifth switch and the input terminal of the inverter are both electrically connected to the enable signal. The first terminal of the fifth switch is electrically connected to the input voltage. The second terminal of the fifth switch is electrically connected to the first terminal of the sixth switch. The second terminal of the sixth switch is electrically connected to the first terminal of the fourth switch. The output terminal of the inverter is electrically connected to the control terminal of the first switch.

4. The negative voltage converter according to claim 3, characterized in that, Also includes: Clamping circuit; The first terminal of the clamping circuit is electrically connected to the control terminal of the second switch and the control terminal of the sixth switch, and the second terminal of the clamping circuit is electrically connected to the voltage output terminal.

5. The negative voltage converter according to any one of claims 1-4, characterized in that, The switching assembly includes: a seventh switching transistor and an eighth switching transistor; The first terminal of the seventh switch is electrically connected to the first terminal of the eighth switch, the second terminal of the seventh switch is electrically connected to the first terminal of the inductor, the second terminal of the eighth switch is grounded, and the control terminals of the seventh and eighth switches are both electrically connected to the second terminal of the first switch.

6. The negative voltage converter according to claim 5, characterized in that, The seventh switch includes a first parasitic diode, and the eighth switch includes a second parasitic diode; The negative terminal of the first parasitic diode is electrically connected to the negative terminal of the second parasitic diode, the positive terminal of the first parasitic diode is electrically connected to the first terminal of the inductor, and the positive terminal of the second parasitic diode is grounded.

7. The negative voltage converter according to any one of claims 1-4, characterized in that, The voltage conversion control circuit includes: a first control switch and a second control switch; The first terminal of the first control switch is electrically connected to the input voltage, the second terminal of the first control switch is electrically connected to the first terminal of the second control switch and the first terminal of the inductor, and the second terminal of the second control switch is electrically connected to the voltage output terminal; The negative voltage converter further includes an enable signal generation circuit, wherein the input terminal of the enable signal generation circuit is electrically connected to the control terminal of the first control switch and the control terminal of the second control switch, and the output terminal of the enable signal generation circuit is electrically connected to the control terminal of the switch assembly control circuit. The enable signal generation circuit is used 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; wherein, under the action of the first voltage, the first control switch is in the off state, and under the action of the second voltage, the second control switch is in the off state.

8. The negative voltage converter according to any one of claims 1-4, characterized in that, Also includes: First comparator and control logic circuit; The first input terminal of the first comparator is electrically connected to the first terminal of the inductor, the second input terminal of the first comparator is electrically connected to the voltage output terminal, the output terminal of the first comparator is electrically connected to the first terminal of the control logic circuit, and the second terminal of the control logic circuit is electrically connected to the control terminal of the voltage conversion control circuit. The first comparator is configured to output a disconnect control signal when the current in the inductor is 0. The control logic circuit is used to disconnect the second terminal and the third terminal of the voltage conversion control circuit based on the disconnection control signal.

9. The negative voltage converter according to claim 8, characterized in that, It also includes an error amplifier and a second comparator; The first input terminal of the error amplifier is electrically connected to the voltage output terminal, the second input terminal of the error amplifier is electrically connected to the reference voltage, the output terminal of the error amplifier is electrically connected to the first input terminal of the second comparator, the second input terminal of the second comparator is electrically connected to the triangular wave signal, and the output terminal of the second comparator is electrically connected to the third terminal of the control logic circuit. The error amplifier is used to generate an amplified error voltage based on the reference voltage and the output voltage; The second comparator is used to generate a pulse modulation signal based on the amplified error voltage and the triangular wave signal.

10. A semiconductor chip, characterized in that, Includes the negative voltage converter according to any one of claims 1-9.

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