Voltage selection circuit, chip and electronic equipment

Abstract

The embodiment of the utility model provides a voltage selection circuit, a chip and electronic equipment, the voltage selection circuit comprises a voltage selection module, the first input end of the voltage selection module is connected with a first voltage signal, and the second input end of the voltage selection module is connected with a second voltage signal; the grounding selection module comprises a first grounding unit and a second grounding unit, the control end of the first grounding unit is connected with the second output end of the voltage selection module, and the control end of the second grounding unit is connected with the first output end of the voltage selection module; and the first output end and the second output end of the voltage selection module are connected with the hysteresis module so as to increase the grounding jump voltage of the first grounding unit and the second grounding unit. The phenomenon that the output voltage signal fluctuates abnormally when the first voltage signal is close to the second voltage signal can be avoided.

Description

Technical Field

[0001] The present application relates to the technical field of integrated circuits, and in particular to a voltage selection circuit, a chip and an electronic device. Background Art

[0002] At present, when multiple voltage sources are involved in the circuit, it is often necessary to select a high-voltage input voltage signal as the power supply voltage signal to improve the driving ability of the circuit. In the related art, two PMOS tubes are usually used to respectively access the two voltage signals V01 and V02, and a certain PMOS tube is selected to be turned on through the voltage difference between the voltage signal V01 and the voltage signal V02 to output the corresponding voltage signal, so that the output voltage signal can be used as the power supply voltage signal.

[0003] However, when the voltage values ​​of the two voltage signals are close, due to the jitter of the voltage signals, there will be a period of time when the actual voltage value of the voltage signal V01 is greater than the actual voltage value of the voltage signal V02, and a period of time when the actual voltage value of the voltage signal V01 is less than the actual voltage value of the voltage signal V02. This causes the two PMOS tubes to be turned on and off, causing abnormal fluctuations in the power supply voltage signal. Utility Model Content

[0004] In view of the above problems, the embodiments of the present application provide a voltage selection circuit, a chip and an electronic device to solve the above technical problems.

[0005] In a first aspect, an embodiment of the present application provides a voltage selection circuit, including:

[0006] A voltage selection module, wherein a first input terminal of the voltage selection module is connected to a first voltage signal, and a second input terminal of the voltage selection module is connected to a second voltage signal;

[0007] A grounding selection module, the grounding selection module includes a first grounding unit and a second grounding unit, the control end of the first grounding unit is connected to the second output end of the voltage selection module, and the control end of the second grounding unit is connected to the first output end of the voltage selection module;

[0008] When the voltage value of the first voltage signal is greater than the voltage value of the second voltage signal, the first output terminal of the voltage selection module outputs the first voltage signal, and the second grounding unit controls the second output terminal of the voltage selection module to be grounded;

[0009] When the voltage value of the second voltage signal is greater than the voltage value of the first voltage signal, the second output terminal of the voltage selection module outputs the second voltage signal, and the first grounding unit controls the first output terminal of the voltage selection module to be grounded;

[0010] The voltage selection circuit further includes a hysteresis module, and the first output terminal and the second output terminal of the voltage selection module are connected to the hysteresis module to increase the ground jump voltage of the first ground unit and the second ground unit.

[0011] In a second aspect, an embodiment of the present application further provides a chip, comprising the above-mentioned voltage selection circuit.

[0012] In a third aspect, an embodiment of the present application further provides an electronic device, comprising the above-mentioned chip or voltage selection circuit.

[0013] In the present application, when the first voltage signal is close to the second voltage signal, causing the voltage selection module to switch back and forth between the two states of outputting the first voltage signal at the first output end and grounding the second output end, and grounding the first output end and outputting the second voltage signal at the second output end, since the first output end and the second output end of the voltage selection module are connected to the hysteresis module, the hysteresis module can increase the grounding jump voltage of the first grounding unit and the second grounding unit, thereby enhancing the ability of the first grounding unit and the second grounding unit to maintain a grounded state, and when the first voltage signal is close to the second voltage signal, the first grounding unit and the second grounding unit will not change their grounded / ungrounded working states due to voltage fluctuations, ultimately avoiding the phenomenon of abnormal fluctuations in the power supply voltage signal when the first voltage signal is close to the second voltage signal.

[0014] These and other aspects of the present application will become more clearly understood in the description of the following embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 A schematic diagram showing a two-choice voltage selection circuit in the related art

[0017] Figure 2 A schematic diagram of a voltage selection circuit provided in an embodiment of the present application is shown.

[0018] Figure 3 A circuit diagram of a voltage selection circuit provided in an embodiment of the present application is shown.

[0019] Figure 4 Another circuit schematic diagram of the voltage selection circuit provided in an embodiment of the present application is shown.

[0020] Figure 5Another circuit schematic diagram of the voltage selection circuit provided in an embodiment of the present application is shown.

[0021] Figure 6 Another circuit schematic diagram of the voltage selection circuit provided in an embodiment of the present application is shown.

[0022] Figure 7 Another circuit schematic diagram of the voltage selection circuit provided in an embodiment of the present application is shown.

[0023] Figure 8 Another circuit schematic diagram of the voltage selection circuit provided in an embodiment of the present application is shown.

[0024] Fig. 9 Another circuit schematic diagram of the voltage selection circuit provided in an embodiment of the present application is shown.

[0025] Fig.10 Another circuit schematic diagram of the voltage selection circuit provided in an embodiment of the present application is shown.

[0026] Fig.11 Another circuit schematic diagram of the voltage selection circuit provided in an embodiment of the present application is shown.

[0027] Among them, 10 is a voltage selection module, 20 is a grounding selection module, 21 is a first grounding unit, 22 is a second grounding unit, 30 is a hysteresis module, and 40 is an output selection module;

[0028] A first voltage signal V1, a second voltage signal V2, a first input terminal IN1, a second input terminal IN2, a first output terminal OUT1, and a second output terminal OUT2;

[0029] A first high potential conduction transistor MN1, a second high potential conduction transistor MN2, a third high potential conduction transistor MN3, a fourth high potential conduction transistor MN4, a first low potential conduction transistor MP1, a second low potential conduction transistor MP2, a third low potential conduction transistor MP3, and a fourth low potential conduction transistor MP4. DETAILED DESCRIPTION

[0030] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0031] In order to enable those skilled in the art to better understand the solutions of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present application.

[0032] In the embodiments of the present application, it should be noted that, in this article, relational terms such as first and second, etc. are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations.

[0033] Moreover, the terms "comprises," "comprising," or any other variation thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0034] In the description of the embodiments of the present application, words such as "example" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "example" or "for example" in the embodiments of the present application is not to be interpreted as being more preferred or having more advantages than another embodiment or design. The use of words such as "example" or "for example" is intended to present relative concepts in a clear manner.

[0035] In addition, the "plurality" in the embodiments of the present application refers to two or more than two. In view of this, in the embodiments of the present application, "plurality" can also be understood as "at least two". "At least one" can be understood as one or more, for example, one, two or more. For example, including at least one means including one, two or more, and there is no limit on which ones are included. For example, including at least one of A, B and C, then A, B, C, A and B, A and C, B and C, or A, B and C can be included.

[0036] It should be noted that in the embodiments of the present application, "connection" can be understood as electrical connection, and the connection between two electrical components can be a direct or indirect connection between the two electrical components. For example, the connection between A and B can be either a direct connection between A and B or an indirect connection between A and B through one or more other electrical components.

[0037] The first pole / first end of each transistor used in the embodiments of the present application is one of the source and the drain, and the second pole / second end of each transistor is the other of the source and the drain. Since the source and drain of the transistor can be symmetrical in structure, the source and drain thereof can be structurally indistinguishable, that is, the first pole / first end and the second pole / second end of the transistor in the embodiments of the present application can be structurally indistinguishable. Exemplarily, in the case where the transistor is a P-type transistor, the first pole / first end of the transistor is the source, and the second pole / second end is the drain; exemplarily, in the case where the transistor is an N-type transistor, the first pole / first end of the transistor is the drain, and the second pole / second end is the source.

[0038] In the circuit structure provided in the embodiments of the present application, the first node, the second node and other nodes do not represent actual existing components, but represent the junction points of related couplings in the circuit diagram, that is, these nodes are nodes formed by the equivalent junction points of related couplings in the circuit diagram.

[0039] At present, when a circuit involves multiple voltage sources for power supply, it is often necessary to select a high voltage input voltage signal as the power supply voltage signal to improve the driving ability of the circuit. Figure 1 , Figure 1 A schematic diagram of a two-choice voltage selection circuit in the related art is shown, and the two-choice voltage selection circuit includes a first PMOS tube P1 and a second PMOS tube P2, the source of the first PMOS tube P1 is connected to the voltage signal V01, the gate of the first PMOS tube P1 is connected to the voltage signal V02, the source of the second PMOS tube P1 is connected to the voltage signal V02, the gate of the second PMOS tube P1 is connected to the voltage signal V01, and the source of the first PMOS tube P1 is connected to the drain of the second PMOS tube P2.

[0040] When the voltage value of the voltage signal V01 is greater than the voltage value of the voltage signal V02, due to the low potential conduction characteristic of the PMOS tube, the first PMOS tube P1 is turned on and the second PMOS tube P2 is in a cut-off state, so the voltage signal V01 with a larger voltage value is output at the common source end of the first PMOS tube P1 and the second PMOS tube P2; conversely, when the voltage value of the voltage signal V02 is greater than the voltage value of the voltage signal V01, due to the low potential conduction characteristic of the PMOS tube, the second PMOS tube P2 is turned on and the first PMOS tube P1 is in a cut-off state, so the voltage signal V02 with a larger voltage value is output at the common source end of the first PMOS tube P1 and the second PMOS tube P2.

[0041] It can be seen that the above two-choose-one voltage selection circuit selects a certain PMOS tube to be turned on by the voltage difference between the voltage signal V01 and the voltage signal V02, thereby outputting the corresponding voltage signal. However, when the voltage values ​​of the two voltage signals are close, due to the jitter of the voltage signal, there will be a period of time when the actual voltage value of the voltage signal V01 is greater than the actual voltage value of the voltage signal V02, and a period of time when the actual voltage value of the voltage signal V01 is less than the actual voltage value of the voltage signal V02, which causes the two PMOS tubes to be turned on and off, resulting in abnormal fluctuations in the power supply voltage signal.

[0042] To this end, the present application provides a voltage selection circuit, a chip and an electronic device, which are described in detail below.

[0043] First, see Figure 2 , Figure 2 A schematic diagram of a voltage selection circuit in an embodiment of the present application is shown, wherein the voltage selection circuit includes:

[0044] A voltage selection module 10, wherein a first input terminal IN1 of the voltage selection module 10 is connected to a first voltage signal V1, and a second input terminal IN2 of the voltage selection module 10 is connected to a second voltage signal V2;

[0045] The grounding selection module 20 includes a first grounding unit 21 and a second grounding unit 22 . The control end of the first grounding unit 21 is connected to the second output end OUT2 of the voltage selection module 10 , and the control end of the second grounding unit 22 is connected to the first output end OUT1 of the voltage selection module 10 .

[0046] Specifically, the voltage selection module 10 has a first input terminal IN1, a second input terminal IN2, a first output terminal OUT1 and a second output terminal OUT2. The first input terminal IN1 of the voltage selection module 10 is connected to the first voltage signal V1, and the first input terminal IN1 and the first output terminal OUT1 can be conducted, so that the first output terminal OUT1 can output the first voltage signal V1; the second input terminal IN2 of the voltage selection module 10 is connected to the second voltage signal V2, and the second input terminal IN2 and the second output terminal OUT2 can be conducted, so that the second output terminal OUT2 can output the second voltage signal V2.

[0047] Among them, the voltage selection module 10 can select the one with higher voltage between the first voltage signal V1 and the second voltage signal V2 for output. For example, when the voltage value of the first voltage signal V1 is greater than the voltage value of the second voltage signal V2, the first input terminal IN1 and the first output terminal OUT1 are connected, and the second input terminal IN2 and the second output terminal OUT2 are disconnected, so that the first output terminal OUT1 of the voltage selection module 10 outputs the first voltage signal V1; conversely, when the voltage value of the second voltage signal V2 is greater than the voltage value of the first voltage signal V1, the first input terminal IN1 and the first output terminal OUT1 are disconnected, and the second input terminal IN2 and the second output terminal OUT2 are connected, so that the second output terminal OUT2 outputs the second voltage signal V2.

[0048] As an example, see Figure 3 , Figure 3 A circuit schematic diagram of a voltage selection circuit in an embodiment of the present application is shown, wherein the voltage selection module 10 includes a first low potential conduction transistor MP1, a second low potential conduction transistor MP2, a comparator COMP and an inverter INV, the first end of the first low potential conduction transistor MP1 is used as the first input end IN1 of the voltage selection module 10 to connect to the first voltage signal V1, the second end of the first low potential conduction transistor MP1 is used as the first output end OUT1 of the voltage selection module 10, the first end of the second low potential conduction transistor MP2 is used as the second input end IN2 of the voltage selection module 10 to connect to the second voltage signal V2, and the second end of the second low potential conduction transistor MP2 is used as the second output end OUT2 of the voltage selection module 10; the inverting input end of the comparator COMP is connected to the first voltage signal V1, the non-inverting input end of the comparator COMP is connected to the second voltage signal V2, the output end of the comparator COMP is connected to the control end of the first low potential conduction transistor MP1, and the output of the comparator COMP is connected to the control end of the second low potential conduction transistor MP2 via the inverter INV.

[0049] When the voltage value of the first voltage signal V1 is greater than the voltage value of the second voltage signal V2, the output end of the comparator COMP outputs a low-level signal, the first low-potential conduction transistor MP1 is turned on, and the second low-potential conduction transistor MP2 is in a cut-off state due to the action of the inverter INV, thereby realizing that the first output end OUT1 of the voltage selection module 10 outputs the first voltage signal V1 with a higher voltage; conversely, when the voltage value of the second voltage signal V2 is greater than the voltage value of the first voltage signal V1, the output end of the comparator COMP outputs a high-level signal, the first low-potential conduction transistor MP1 is in a cut-off state, and the second low-potential conduction transistor MP2 is turned on due to the action of the inverter INV, thereby realizing that the second output end OUT2 of the voltage selection module 10 outputs the second voltage signal V2 with a higher voltage.

[0050] It is understandable that the voltage selection module 10 is not limited to the above embodiment. For example, the first low potential conduction transistor MP1 and the second low potential conduction transistor MP2 may be replaced with other transistors such as NMOS transistors, IGBT transistors or triodes.

[0051] The grounding selection module 20 includes a first grounding unit 21 and a second grounding unit 22. The input end of the first grounding unit 21 is connected to the first output end OUT1 of the voltage selection module 10, the output end of the first grounding unit 21 is grounded, and the control end of the first grounding unit 21 is connected to the second output end OUT2 of the voltage selection module 10; the input end of the second grounding unit 22 is connected to the second output end OUT2 of the voltage selection module 10, the output end of the second grounding unit 22 is grounded, and the control end of the second grounding unit 22 is connected to the first output end OUT1 of the voltage selection module 10.

[0052] Among them, the grounding selection module 20 can control one of the first output terminal OUT1 and the second output terminal OUT2 of the voltage selection module 10 to be grounded, while the other is not grounded, so as to ensure that the output voltage is a voltage signal with a higher voltage. For example, when the voltage value of the first voltage signal V1 is greater than the voltage value of the second voltage signal V2, the first output terminal OUT1 of the voltage selection module 10 outputs the first voltage signal V1, and the second grounding unit 22 controls the second output terminal OUT2 of the voltage selection module 10 to be grounded; conversely, when the voltage value of the second voltage signal V2 is greater than the voltage value of the first voltage signal V1, the second output terminal OUT2 of the voltage selection module 10 outputs the second voltage signal V2, and the first grounding unit 21 controls the first output terminal OUT1 of the voltage selection module 10 to be grounded. That is to say, when the grounding selection module 20 is working, one of the first output terminal OUT1 and the second output terminal OUT2 of the voltage selection module 10 is always grounded, while the other is not grounded, so as to avoid the phenomenon that the first output terminal OUT1 and the second output terminal OUT2 of the voltage selection module 10 output voltage signals at the same time.

[0053] As an example, see Figure 4 , Figure 4Another circuit schematic diagram of the voltage selection circuit in an embodiment of the present application is shown, wherein the first grounding unit 21 includes a first high potential conduction transistor MN1, and the second grounding unit 22 includes a second high potential conduction transistor MN2; the first end of the first high potential conduction transistor MN1 is connected to the first output end OUT1 of the voltage selection module 10, the second end of the first high potential conduction transistor MN1 is grounded, and the control end of the first high potential conduction transistor MN1 is connected to the second output end OUT2 of the voltage selection module 10; the first end of the second high potential conduction transistor MN2 is connected to the second output end OUT2 of the voltage selection module 10, the second end of the second high potential conduction transistor MN2 is grounded, and the control end of the second high potential conduction transistor MN2 is connected to the first output end OUT1 of the voltage selection module 10.

[0054] Specifically, when the voltage value of the first voltage signal V1 is greater than the voltage value of the second voltage signal V2, the first output terminal OUT1 of the voltage selection module 10 outputs the first voltage signal V1 as a high level, and the second output terminal OUT2 of the voltage selection module 10 has no signal output as a low level, and the first high potential conduction transistor MN1 is in a cut-off state, so that the first output terminal OUT1 of the voltage selection module 10 is not grounded and normally outputs the first voltage signal V1, and the second high potential conduction transistor MN2 is in a conducting state, so that the second output terminal OUT2 of the voltage selection module 10 is normally grounded; On the contrary, when the voltage value of the second voltage signal V2 is greater than the voltage value of the first voltage signal V1, the second output terminal OUT2 of the voltage selection module 10 outputs the second voltage signal V2 as a high level, and the first output terminal OUT1 of the voltage selection module 10 has no signal output as a low level, so the second high-potential conduction transistor MN2 is in a cut-off state, so that the second output terminal OUT2 of the voltage selection module 10 is not grounded and normally outputs the second voltage signal V2, and the first high-potential conduction transistor MN1 is in a conducting state, so that the second output terminal OUT2 of the voltage selection module 10 is normally grounded.

[0055] It is understandable that the grounding selection module 20 is not limited to the above-mentioned embodiment. Figure 3 and Figure 4 Combined, so that Figure 3 The output of the comparator COMP is Figure 4 The control ends of the first high potential conduction transistor MN1 and the second high potential conduction transistor MN2 are connected, and an inverter is used to turn on one of the first high potential conduction transistor MN1 and the second high potential conduction transistor MN2, while the other is turned off.

[0056] It should be noted that the high-potential turn-on transistor referred to in the embodiments of the present application (for example, the first high-potential turn-on transistor MN1, the second high-potential turn-on transistor MN2, etc.) may refer to an NMOS tube, and the low-potential turn-on transistor referred to in the embodiments of the present application (for example, the first low-potential turn-on transistor MP1, the second low-potential turn-on transistor MP2, etc.) may refer to a PMOS tube, but is not limited to this. For example, the high-potential turn-on transistor may also be an IGBT tube including an N-channel, and the low-potential turn-on transistor may also be an IGBT tube including a P-channel.

[0057] During the operation of the voltage selection circuit, when the first voltage signal V1 is close to the second voltage signal V2, the first output terminal OUT1 and the second output terminal OUT2 of the voltage selection module 10 will alternately output the first voltage signal V1 and the second voltage signal V2, causing the abnormal fluctuation of the output voltage signal. For example, taking the voltage of the first voltage signal V1 as 6.2V and the second voltage signal V2 as 6.1V, due to voltage fluctuation, the actual voltage value of the first voltage signal V1 is 6.2V in a short time, and the actual voltage value of the second voltage signal V2 is 6.1V, so that the voltage value of the first voltage signal V1 is less than the second voltage signal V2 in a short time, thereby causing the voltage selection module 10 to switch back and forth between the two states of outputting the first voltage signal V1 at the first output terminal OUT1 and grounding the second output terminal OUT2, and the first output terminal OUT1 being grounded and the second output terminal OUT2 outputting the second voltage signal V2.

[0058] In the embodiment of the present application, the voltage selection circuit of the present application further includes a hysteresis module 30. The first output terminal OUT1 and the second output terminal OUT2 of the voltage selection module 10 are connected to the hysteresis module 30. Therefore, the hysteresis module 30 can increase the ground jump voltage of the first ground unit 21 and the second ground unit 22. For example, taking the voltage of the above-mentioned first voltage signal V1 as 6.2V and the second voltage signal V2 as 6.1V as an example, the ground jump voltage of the first ground unit 21 and the second ground unit 22 is set to 0.15V when the ground jump voltage of the hysteresis module 30 is set. Due to voltage fluctuations, the actual voltage value of the first voltage signal V1 in a short period of time is 6.2V, and the actual voltage value of the second voltage signal V2 is 6.1V. The first voltage signal V1 and the second voltage signal V2 are The voltage difference between the first grounding unit 21 and the second grounding unit 22 cannot reach the grounding jump voltage of the first grounding unit 21 and the second grounding unit 22. Therefore, the first grounding unit 21 will not change the first output terminal OUT1 of the voltage selection module 10 from an ungrounded state to a grounded state, and the second grounding unit 22 will not change the second output terminal OUT2 of the voltage selection module 10 from a grounded state to an ungrounded state, that is, the ability of the first grounding unit 21 and the second grounding unit 22 to maintain a grounded / ungrounded state is enhanced. When the first voltage signal V1 is close to the second voltage signal V2, the first grounding unit 21 and the second grounding unit 22 will not change their working states due to voltage fluctuations, and finally avoid the phenomenon of abnormal fluctuation of the output voltage signal when the first voltage signal V1 is close to the second voltage signal V2.

[0059] It should be noted that the grounding jump voltage of the first grounding unit 21 in the present application refers to: the first grounding unit 21 controls the first output terminal OUT1 of the voltage selection module 10 to change from an ungrounded state to a threshold voltage corresponding to a grounded state, that is, the actual voltage difference between the second voltage signal V2 and the first voltage signal V1 needs to be greater than the grounding jump voltage to achieve the switching of the output voltage; and the grounding jump voltage of the second grounding unit 22 refers to the second grounding unit 22 controls the second output terminal OUT2 of the voltage selection module 10 to change from an ungrounded state to a threshold voltage corresponding to a grounding turntable, that is, the actual voltage difference between the first voltage signal V1 and the second voltage signal V2 needs to be greater than the grounding jump voltage to achieve the switching of the output voltage.

[0060] As an example, see Figure 5 , Figure 5Another circuit schematic diagram of the voltage selection circuit in an embodiment of the present application is shown, wherein the hysteresis module 30 includes a third high potential conduction transistor MN3 and a fourth high potential conduction transistor MN4; the first end of the third high potential conduction transistor MN3 is connected to the first output end OUT1 of the voltage selection module 10, the second end of the third high potential conduction transistor MN3 is grounded, and the control end of the third high potential conduction transistor MN3 is connected to the second output end OUT2 of the voltage selection module 10; the first end of the fourth high potential conduction transistor MN4 is connected to the second output end OUT2 of the voltage selection module 10, the second end of the fourth high potential conduction transistor MN4 is grounded, and the control end of the fourth high potential conduction transistor MN4 is connected to the first output end OUT1 of the voltage selection module 10.

[0061] Taking the case where the voltage value of the first voltage signal V1 is greater than the voltage value of the second voltage signal V2 under normal circumstances as an example, under normal circumstances, the control ends of the first high potential conduction transistor MN1 and the third high potential conduction transistor MN3 are at a low level and are in a cut-off state, and the control ends of the second high potential conduction transistor MN2 and the fourth high potential conduction transistor MN4 are at a high level and are in a conduction state. If the voltage value of the second voltage signal V2 is greater than the voltage value of the first voltage signal V1 due to voltage fluctuations, since the third high potential conduction transistor MN3 is cut off and the fourth high potential conduction transistor MN4 is turned on, at this time, the fourth high potential conduction transistor MN4 strengthens the grounding ability of the second high potential conduction transistor MN2, and the second voltage signal V2 needs to be larger to simultaneously turn on the first high potential conduction transistor MN1 and the third high potential conduction transistor MN3 and complete the output voltage switching process.

[0062] On the contrary, under normal circumstances, the voltage value of the second voltage signal V2 is greater than the voltage value of the first voltage signal V1. If the voltage value of the first voltage signal V1 is greater than the voltage value of the second voltage signal V2 due to voltage fluctuations, the third high-potential conduction transistor MN3 strengthens the grounding capability of the first high-potential conduction transistor MN1, and the first voltage signal V1 needs to be larger in order to simultaneously turn on the second high-potential conduction transistor MN2 and the fourth high-potential conduction transistor MN4 and complete the output voltage switching process.

[0063] Therefore, in the above embodiment, by setting a third high potential turn-on transistor MN3 in parallel with the first high potential turn-on transistor MN1, and setting a fourth high potential turn-on transistor MN4 in parallel with the second high potential turn-on transistor MN2, the ground jump voltage of the first grounding unit 21 and the second grounding unit 22 can be increased, thereby avoiding the phenomenon of abnormal fluctuation of the output voltage signal when the first voltage signal V1 is close to the second voltage signal V2.

[0064] As another example, see Figure 6, Figure 6 Another circuit schematic diagram of the voltage selection circuit in an embodiment of the present application is shown, wherein the hysteresis module 30 includes a hysteresis module including multiple first parallel transistors Mn1, multiple first switches S1, multiple second parallel transistors Mn2 and multiple second switches S2; the control end of the first parallel transistor Mn1 is connected to the second output end of the voltage selection module, and the first end of the first parallel transistor Mn1 is connected to the first output end of the voltage selection module; the first switch S1 corresponds to the first parallel transistor Mn1 one by one, one end of the first switch S1 is connected to the second end of the first parallel transistor Mn1, and the other end is grounded; the control end of the second parallel transistor Mn2 is connected to the first output end of the voltage selection module, and the first end of the second parallel transistor Mn2 is connected to the second output end of the voltage selection module; the second switch S2 corresponds to the second parallel transistor Mn2 one by one, one end of the second switch S2 is connected to the second end of the first parallel transistor Mn1, and the other end is grounded.

[0065] It should be noted that, when the number of the first switch S1 and the second switch S2 closed is more, the number of the first parallel transistors Mn1 connected in parallel with the first high potential conduction transistor MN1 is more, and the number of the first parallel transistors Mn1 connected in parallel with the second high potential conduction transistor MN1 is more; conversely, when the number of the first switch S1 and the second switch S2 closed is less, the number of the first parallel transistors Mn1 connected in parallel with the first high potential conduction transistor MN1 is less, and the number of the first parallel transistors Mn1 connected in parallel with the second high potential conduction transistor MN1 is less. Therefore, by controlling the number of the first switch S1 and the second switch S2 closed, the hysteresis capability of the hysteresis module 30 can be changed, that is, the hysteresis module 30 can be changed to increase the size of the ground jump voltage of the first ground unit 21 and the second ground unit 22, so that the size of the ground jump voltage of the first ground unit 21 and the second ground unit 22 is adjustable to adapt to the fluctuation amplitude of the first voltage signal V1 and the second voltage signal V2 in the actual scenario and achieve the best hysteresis effect.

[0066] In some embodiments of the present application, see Figure 7 , Figure 7 Another circuit schematic diagram of the voltage selection circuit in an embodiment of the present application is shown, wherein the voltage selection circuit also includes an output selection module 40; the output selection module 40 is connected to the first output terminal OUT1 of the voltage selection module 10, and the output selection module 40 is connected to the second output terminal OUT2 of the voltage selection module 10; wherein the output selection module 40 selects the higher voltage of the first voltage signal V1 and the second voltage signal V2 for output according to the voltage difference between the first output terminal OUT1 and the second output terminal OUT2 of the voltage selection module 10.

[0067] It should be noted that, from the two-choice voltage selection circuit in the aforementioned related technology, it can be seen that the two-choice voltage selection circuit selects a PMOS tube to be turned on through the voltage difference between the voltage signal V01 and the voltage signal V02 to output the corresponding voltage signal. When the voltage signal V01 is close to the voltage signal V02, the turned-on PMOS tube is very likely to work in the linear region and have a larger resistance, which leads to the problem of low power supply efficiency. In the embodiment of the present application, since one of the first output terminal OUT1 and the second output terminal OUT2 of the voltage selection module 10 must output a voltage signal and the other is grounded, the output selection module 40 in the embodiment of the present application actually selects the higher voltage of the first voltage signal V1 and the second voltage signal V2 for output based on the voltage difference between the first voltage signal V1 and the ground terminal or the voltage difference between the second voltage signal V2 and the ground terminal. Therefore, the transistor in the output selection module 40 can operate in the saturation region and have a smaller resistance. Compared with the two-to-one voltage selection circuit in the related art, it can avoid the first voltage signal V1 and the second voltage signal V2 being close to each other, causing the transistor in the voltage selection module 10 to operate in the linear region and have a larger resistance, thereby reducing the power supply efficiency.

[0068] As an example, see Figure 8 , Figure 8 Another circuit schematic diagram of the voltage selection circuit in the embodiment of the present application is shown, wherein the output selection module 40 includes a third low potential conduction transistor MP3 and a fourth low potential conduction transistor MP4; the first end of the third low potential conduction transistor MP3 is connected to the first voltage signal V1, the control end of the third low potential conduction transistor MP3 is connected to the second output end OUT2 of the voltage selection module 10, the control end of the fourth low potential conduction transistor MP4 is connected to the first output end OUT1 of the voltage selection module 10, the first end of the fourth low potential conduction transistor MP4 is connected to the second voltage signal V2, and the second end of the third low potential conduction transistor MP3 is connected to the second end of the fourth low potential conduction transistor MP4.

[0069] Taking the case where the voltage value of the first voltage signal V1 is greater than the voltage value of the second voltage signal V2 as an example, the first output terminal OUT1 of the voltage selection module 10 outputs the first voltage signal V1 (high level signal), and the second output terminal OUT2 of the voltage selection module 10 is grounded (outputs a low level signal). Therefore, for the third low potential conduction transistor MP3 and the fourth low potential conduction transistor MP4, the source and gate voltage difference of the third low potential conduction transistor MP3 is the voltage difference between the first voltage signal V1 and the ground terminal, and the source and gate voltage difference of the fourth low potential conduction transistor MP4 is the voltage difference between the second voltage signal V2 and the first voltage signal V1. Therefore, it can be ensured that the third low potential conduction transistor MP3 operates in the saturation region and has a smaller resistance, thereby reducing the voltage drop of the first voltage signal V1 passing through the third low potential conduction transistor MP3, and ultimately improving the power supply efficiency of the voltage selection circuit.

[0070] As another example, see Fig. 9 , Fig. 9 Another circuit diagram of the voltage selection circuit in the embodiment of the present application is shown, wherein: Fig. 9 and Figure 8 The difference is that the first end of the third low potential conduction transistor MP3 is connected to the first output end OUT1 of the voltage selection module 10 , and the first end of the fourth low potential conduction transistor MP4 is connected to the second output end OUT2 of the voltage selection module 10 .

[0071] Similarly, taking the voltage value of the first voltage signal V1 as greater than the voltage value of the second voltage signal V2 as an example, for the third low potential conduction transistor MP3 and the fourth low potential conduction transistor MP4, the source and gate voltage difference of the third low potential conduction transistor MP3 is the voltage difference between the first voltage signal V1 and the ground terminal, and the source and gate voltage difference of the fourth low potential conduction transistor MP4 is the voltage difference between the ground terminal and the first voltage signal V1. In other words, Figure 8 The difference is that the voltage difference between the source and the gate of the third low potential conduction transistor MP3 and the fourth low potential conduction transistor MP4 is the voltage difference of the first voltage signal V1 / the second voltage signal V2 relative to the ground terminal, so it can ensure that the third low potential conduction transistor MP3 is fully turned on and the fourth low potential conduction transistor MP4 is fully turned off, thereby avoiding the phenomenon that the third low potential conduction transistor MP3 and the fourth low potential conduction transistor MP4 are abnormally turned on / off due to voltage fluctuations when the first voltage signal V1 is close to the second voltage signal V2.

[0072] In some embodiments of the present application, see Fig.10 , Fig.10Another circuit schematic diagram of the voltage selection circuit in an embodiment of the present application is shown, wherein the voltage selection module 10 includes a first low potential conduction transistor MP1 and a second low potential conduction transistor MP2; the first end of the first low potential conduction transistor MP1 is connected to the first voltage signal V1, and the second end of the first low potential conduction transistor MP1 is connected to the first grounding unit 21; the first end of the second low potential conduction transistor MP2 is connected to the second voltage signal V2, and the second end of the second low potential conduction transistor MP2 is connected to the second grounding unit 22; the control end of the first low potential conduction transistor MP1 is connected to the second end of the second low potential conduction transistor MP2, and the control end of the second low potential conduction transistor MP2 is connected to the second end of the first low potential conduction transistor MP1.

[0073] Specifically, in the initial state, the first low potential conduction transistor MP1 and the second low potential conduction transistor MP2 are in a weak conduction state. When the voltage value of the first voltage signal V1 is greater than the voltage value of the second voltage signal V2, the voltage at the second end of the first low potential conduction transistor MP1 will be greater than the voltage at the second end of the second low potential conduction transistor MP2. Since the control end of the first low potential conduction transistor MP1 is connected to the second end of the second low potential conduction transistor MP2, and the control end of the second low potential conduction transistor MP2 is connected to the second end of the first low potential conduction transistor MP1, the second low potential conduction transistor MP2 will be cut off and the first low potential conduction transistor MP1 will be turned on. In other words, when the voltage value of the second voltage signal V2 is greater than the voltage value of the first voltage signal V1, the voltage at the second end of the second low potential conduction transistor MP2 will be greater than the voltage at the second end of the first low potential conduction transistor MP1. Since the control end of the first low potential conduction transistor MP1 is connected to the second end of the second low potential conduction transistor MP2, and the control end of the second low potential conduction transistor MP2 is connected to the second end of the first low potential conduction transistor MP1, the first low potential conduction transistor MP1 will be cut off and the second low potential conduction transistor MP2 will be turned on, thereby finally achieving the purpose of the voltage selection module 10 selecting an output with a higher voltage value between the first voltage signal V1 and the second voltage signal V2.

[0074] In some embodiments of the present application, see Fig.11 , Fig.11 Another circuit diagram of the voltage selection circuit in the embodiment of the present application is shown. Fig.10 The difference is that the substrate of the third low potential conduction transistor MP3 is connected to the drain, and the substrate of the fourth low potential conduction transistor MP4 is also connected to the drain, which is beneficial to prevent leakage caused by damage of the third low potential conduction transistor MP3 and the fourth low potential conduction transistor MP4.

[0075] The embodiment of the present application also provides a chip, which includes the above-mentioned voltage selection circuit. A chip (Integrated Circuit, IC) is also called a chip, and the chip can be, but is not limited to, a SOC (System on Chip) chip or a SIP (system in package) chip. Since the chip in the embodiment of the present application is provided with the voltage selection circuit of the above-mentioned embodiment, it has all the beneficial effects of the above-mentioned voltage selection circuit, which will not be repeated here.

[0076] The embodiment of the present application also provides an electronic device, which includes a device body and a chip as described above provided in the device body. The electronic device may be, but is not limited to, a weight scale, a body fat scale, a nutrition scale, an infrared electronic thermometer, a pulse oximeter, a human body composition analyzer, a mobile power supply, a wireless charger, a fast charger, a car charger, an adapter, a display, a USB (Universal Serial Bus) docking station, a stylus, a true wireless headset, a car central control screen, a car, a smart wearable device, a mobile terminal, and a smart home device. Smart wearable devices include, but are not limited to, smart watches, smart bracelets, and cervical massagers. Mobile terminals include, but are not limited to, smart phones, laptops, tablet computers, and POS (point of sales terminal). Smart home devices include, but are not limited to, smart sockets, smart rice cookers, smart sweepers, and smart lights.

[0077] The above are only preferred embodiments of the present application, and are not intended to limit the present application in any form. Although the present application has been disclosed as above with preferred embodiments, it is not intended to limit the present application. Any technical personnel in the field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present application. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application are still within the scope of the technical solution of the present application.

Claims

1. A voltage selection circuit, characterized in that: include: A voltage selection module, wherein a first input terminal of the voltage selection module is connected to a first voltage signal, and a second input terminal of the voltage selection module is connected to a second voltage signal; A grounding selection module, the grounding selection module comprising a first grounding unit and a second grounding unit, the control end of the first grounding unit is connected to the second output end of the voltage selection module, and the control end of the second grounding unit is connected to the first output end of the voltage selection module; When the voltage value of the first voltage signal is greater than the voltage value of the second voltage signal, the first output terminal of the voltage selection module outputs the first voltage signal, and the second grounding unit controls the second output terminal of the voltage selection module to be grounded; When the voltage value of the second voltage signal is greater than the voltage value of the first voltage signal, the second output terminal of the voltage selection module outputs the second voltage signal, and the first grounding unit controls the first output terminal of the voltage selection module to be grounded; The voltage selection circuit further includes a hysteresis module, and a first output terminal and a second output terminal of the voltage selection module are connected to the hysteresis module to increase the grounding jump voltage of the first grounding unit and the second grounding unit.

2. The voltage selection circuit according to claim 1, characterized in that: The first grounding unit includes a first high potential conduction transistor, and the second grounding unit includes a second high potential conduction transistor; The first end of the first high potential conduction transistor is connected to the first output end of the voltage selection module, the second end of the first high potential conduction transistor is grounded, and the control end of the first high potential conduction transistor is connected to the second output end of the voltage selection module; The first end of the second high potential conduction transistor is connected to the second output end of the voltage selection module, the second end of the second high potential conduction transistor is grounded, and the control end of the second high potential conduction transistor is connected to the first output end of the voltage selection module.

3. The voltage selection circuit according to claim 2, characterized in that: The hysteresis module includes a third high potential conduction transistor and a fourth high potential conduction transistor; The first end of the third high potential conduction transistor is connected to the first output end of the voltage selection module, the second end of the third high potential conduction transistor is grounded, and the control end of the third high potential conduction transistor is connected to the second output end of the voltage selection module; The first end of the fourth high potential conduction transistor is connected to the second output end of the voltage selection module, the second end of the fourth high potential conduction transistor is grounded, and the control end of the fourth high potential conduction transistor is connected to the first output end of the voltage selection module.

4. The voltage selection circuit according to claim 2, characterized in that: The hysteresis module includes a plurality of first parallel transistors, a plurality of first switches, a plurality of second parallel transistors, and a plurality of second switches; The control end of the first parallel transistor is connected to the second output end of the voltage selection module, and the first end of the first parallel transistor is connected to the first output end of the voltage selection module; The first switch corresponds to the first parallel transistor in a one-to-one manner, one end of the first switch is connected to the second end of the first parallel transistor, and the other end is grounded; The control end of the second parallel transistor is connected to the first output end of the voltage selection module, and the first end of the second parallel transistor is connected to the second output end of the voltage selection module; The second switches correspond to the second parallel transistors in a one-to-one manner. One end of the second switch is connected to the second end of the first parallel transistor, and the other end of the second switch is grounded.

5. The voltage selection circuit according to claim 1, characterized in that: The voltage selection circuit also includes an output selection module; The output selection module is connected to the first output terminal of the voltage selection module, and the output selection module is connected to the second output terminal of the voltage selection module; The output selection module selects the one with a higher voltage between the first voltage signal and the second voltage signal as the output according to the voltage difference between the first output terminal and the second output terminal of the voltage selection module.

6. The voltage selection circuit according to claim 5, characterized in that: The output selection module includes a third low potential conduction transistor and a fourth low potential conduction transistor; The control end of the third low potential conduction transistor is connected to the second output end of the voltage selection module, the control end of the fourth low potential conduction transistor is connected to the first output end of the voltage selection module, and the second end of the third low potential conduction transistor is connected to the second end of the fourth low potential conduction transistor.

7. The voltage selection circuit according to claim 6, characterized in that: The first terminal of the third low potential conduction transistor is connected to the first voltage signal, and the first terminal of the fourth low potential conduction transistor is connected to the second voltage signal; or The first end of the third low potential conduction transistor is connected to the first output end of the voltage selection module, and the first end of the fourth low potential conduction transistor is connected to the second output end of the voltage selection module.

8. The voltage selection circuit according to any one of claims 1 to 7, characterized in that: The voltage selection module includes a first low potential conduction transistor and a second low potential conduction transistor; A first terminal of the first low potential conduction transistor is connected to the first voltage signal, and a second terminal of the first low potential conduction transistor is connected to the first grounding unit; A first terminal of the second low potential conduction transistor is connected to the second voltage signal, and a second terminal of the second low potential conduction transistor is connected to the second grounding unit; The control end of the first low potential conduction transistor is connected to the second end of the second low potential conduction transistor, and the control end of the second low potential conduction transistor is connected to the second end of the first low potential conduction transistor.

9. A chip, characterized in that: The method comprises a voltage selection circuit as claimed in any one of claims 1 to 8.

10. An electronic device, characterized in that: Comprising the chip as claimed in claim 9.

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