阅读说明：本技术 一种能够实现零电位位置自动切换的切换开关 (Change-over switch capable of realizing automatic zero potential position change-over ) 是由 刘海涛 徐宏林 张�浩 于 2019-10-21 设计创作，主要内容包括：本发明公开了一种能够实现零电位位置自动切换的切换开关电路,所述切换开关电路包括一个NMOS管、一个PMOS管,所述切换开关电路用于对至少一个正压模块和至少一个负压模块进行供电控制,所述NMOS管的源极与所述PMOS管的源极相连,并连接至“零电位”处；所述NMOS管的栅极和所述PMOS管的栅极相连,并连接至供电输入支路,所述NMOS管的发射极输出给所述正压模块的接地输入端,所述PMOS管的发射极输出给所述负压模块的正输入端。(The invention discloses a change-over switch circuit capable of realizing automatic change-over of a zero potential position, which comprises an NMOS (N-channel metal oxide semiconductor) tube and a PMOS (P-channel metal oxide semiconductor) tube, wherein the change-over switch circuit is used for carrying out power supply control on at least one positive voltage module and at least one negative voltage module, and a source electrode of the NMOS tube is connected with a source electrode of the PMOS tube and is connected to a zero potential position; the grid electrode of the NMOS tube is connected with the grid electrode of the PMOS tube and is connected to a power supply input branch, the emitting electrode of the NMOS tube is output to the grounding input end of the positive voltage module, and the emitting electrode of the PMOS tube is output to the positive input end of the negative voltage module.)

1. A change-over switch circuit capable of realizing automatic switching of a zero potential position is characterized by comprising an NMOS tube and a PMOS tube,

the switching circuit is used for controlling power supply of at least one positive voltage module and at least one negative voltage module, and the source electrode of the NMOS tube is connected with the source electrode of the PMOS tube and is connected to a zero potential; the grid electrode of the NMOS tube is connected with the grid electrode of the PMOS tube and is connected to a power supply input branch, the emitting electrode of the NMOS tube is output to the grounding input end of the positive voltage module, and the emitting electrode of the PMOS tube is output to the positive input end of the negative voltage module.

2. The switch circuit capable of automatically switching between zero potential positions according to claim 1, wherein the power supply input branch is further connected to the positive input terminal of the positive voltage module and the negative input terminal of the negative voltage module respectively.

3. The switcher circuit capable of realizing automatic zero potential position switching according to claim 1, wherein the power supply input branch inputs a positive level or a negative level.

4. The transfer switch circuit capable of realizing automatic zero-potential position transfer according to claim 1, wherein the positive voltage module supplies a positive voltage during normal operation, and the negative voltage module supplies a negative voltage during normal operation.

5. The switcher circuit capable of realizing automatic zero-potential position switching according to claim 1, wherein an absolute value of a turn-on voltage of the NMOS transistor and the PMOS transistor is smaller than an absolute value of an input voltage of a power supply input branch.

6. A method for variably supplying positive and negative voltages using the transfer switch circuit of claim 1, the method comprising: the method comprises the steps of providing an indefinite positive and negative input voltage for a power supply input branch, and simultaneously connecting the power supply input branch to a positive input end of a positive pressure module and a negative input end of a negative pressure module; connecting the source electrode of the NMOS tube with the source electrode of the PMOS tube and connecting the source electrodes to a zero potential; connecting the grid electrode of the NMOS tube with the grid electrode of the PMOS tube and connecting the grid electrodes to a power supply input branch circuit; outputting the emitter of the NMOS tube to the grounding input end of the positive voltage module; the emitting electrode of the PMOS tube is output to the positive input end of the negative voltage module, and when the power supply input branch circuit inputs positive voltage, the switch switching circuit switches zero potential to the emitting electrode of the NMOS tube so as to cut off the PMOS tube; when the power supply input branch circuit inputs negative voltage, the switch switching circuit switches zero potential to the emitting electrode of the PMOS tube so as to cut off the NMOS tube.

7. The method of claim 6, wherein the positive module and the negative module provide a positive voltage for normal operation of the positive module and a negative voltage for normal operation of the negative module.

8. The method of claim 6, wherein an absolute value of a turn-on voltage of the NMOS and PMOS transistors is less than an absolute value of a supply input branch input voltage.

9. A power amplification driver for driving a plurality of target modules, wherein the target modules include a positive voltage module and a negative voltage module, and the power amplification driver includes the switcher circuit as claimed in claim 1.

Technical Field

The invention relates to the field of electricity, in particular to a control switch capable of realizing automatic switching of a zero potential position.

Background

In integrated circuit design, there is a working condition that a chip can support two types of positive and negative voltage power supplies. Under the condition, when the chip needs to be loaded with positive voltage or negative voltage for power supply, the potential connection between the corresponding internal power supply and the ground can be automatically switched, so that the positive voltage module and the negative voltage module can normally and safely work or be switched off, and the damage of the corresponding modules caused by the fact that the positive voltage module or the negative voltage module is mistakenly connected to a power supply with opposite polarity is avoided.

However, the existing circuits capable of realizing positive-voltage and negative-voltage power supply often adopt redundant designs or design complicated safety protection mechanisms to avoid reverse connection of polarities. For example, the existing bridge circuits and the like are often complex in structure, relatively many devices are needed, the cost is high, and the robustness is poor.

In the design of an integrated circuit, how to realize corresponding functions in a simplest way is the key to reduce the power consumption and the cost of a chip and improve the overall performance of the chip. Therefore, the conventional method for identifying positive and negative voltage power supply is not economical and effective enough in realizing high-integration, low-power-consumption and low-cost integrated circuit design due to large scale and complexity.

Disclosure of Invention

In view of the above problems in the prior art, it is desirable to provide a simple switching circuit capable of accurately and rapidly switching a zero potential position.

The invention has smart structure, only two different MOS tubes are skillfully matched with the positive pressure module and the negative pressure module, the zero potential position can be switched, and whether positive pressure power supply or negative pressure power supply is adopted, the positive pressure module and the negative pressure module always work as the correctly connected module, thereby realizing the effective protection of the positive pressure module and the negative pressure module.

The circuit is characterized by comprising an NMOS (N-channel metal oxide semiconductor) tube and a PMOS (P-channel metal oxide semiconductor) tube, wherein the change-over switch circuit is used for controlling power supply of at least one positive voltage module and at least one negative voltage module, and the source electrode of the NMOS tube is connected with the source electrode of the PMOS tube and is connected to a zero potential; the grid electrode of the NMOS tube is connected with the grid electrode of the PMOS tube and is connected to a power supply input branch, the emitting electrode of the NMOS tube is output to the grounding input end of the positive voltage module, and the emitting electrode of the PMOS tube is output to the positive input end of the negative voltage module.

In a preferred implementation manner, the power supply input branch is further connected to the positive input end of the positive pressure module and the negative input end of the negative pressure module respectively.

In another preferred implementation, the supply input branch inputs a positive level or a negative level.

In another preferred implementation manner, the power supply voltage is a positive value when the positive voltage module works normally, and the power supply voltage is a negative value when the negative voltage module works normally. The positive voltage module is a module which is distinguished according to different power supply voltages in working, wherein the positive voltage module refers to that the power supply voltage is a positive value (such as +5V) in normal working, and correspondingly refers to the ground (0V); the negative voltage module indicates that the power supply voltage is negative (e.g., -5V) in normal operation, and the corresponding reference is ground (0V).

In another preferred implementation manner, an absolute value of a turn-on voltage of the NMOS transistor and the PMOS transistor is smaller than an absolute value of an input voltage of the power supply input branch.

In another aspect, the present invention provides a method for performing a positive and negative voltage indefinite power supply by using the changeover switch circuit, the method comprising: the method comprises the steps of providing an indefinite positive and negative input voltage for a power supply input branch, and simultaneously connecting the power supply input branch to a positive input end of a positive pressure module and a negative input end of a negative pressure module; connecting the source electrode of the NMOS tube with the source electrode of the PMOS tube and connecting the source electrodes to a zero potential; connecting the grid electrode of the NMOS tube with the grid electrode of the PMOS tube and connecting the grid electrodes to a power supply input branch circuit; outputting the emitter of the NMOS tube to the grounding input end of the positive voltage module; the emitting electrode of the PMOS tube is output to the positive input end of the negative voltage module, and when the power supply input branch circuit inputs positive voltage, the switch switching circuit switches zero potential to the emitting electrode of the NMOS tube so as to cut off the PMOS tube; when the power supply input branch circuit inputs negative voltage, the switch switching circuit switches zero potential to the emitting electrode of the PMOS tube so as to cut off the NMOS tube.

In a preferred implementation manner, the positive voltage module and the negative voltage module are modules in which the power supply voltage is a positive value when the positive voltage module normally works, the power supply voltage is a negative value when the negative voltage module normally works, and the negative voltage is distinguished according to the difference of the power supply voltages when the negative voltage module normally works, the positive voltage module refers to a module in which the power supply voltage is a positive value (for example +5V) when the positive voltage module normally works, and the power supply voltage is correspondingly referred to as ground (0V); the negative voltage module indicates that the power supply voltage is negative (e.g., -5V) in normal operation, and the corresponding reference is ground (0V).

In another preferred implementation manner, an absolute value of a turn-on voltage of the NMOS transistor and the PMOS transistor is smaller than an absolute value of an input voltage of the power supply input branch. Advantageous effects

The level control switch circuit of the invention can automatically switch the supply path of the zero potential level according to the plus or minus of the loaded voltage when the chip loads the voltage. When positive voltage (+ V) is used for supplying power, the zero potential (0) is used as the ground of the positive voltage module, and the positive voltage (+ V) is used as the power supply for the positive voltage module; when negative voltage (-V) supplies power, the zero potential (0) is used as a negative voltage module 'power supply', and the negative voltage (-V) is used as 'ground' for the negative voltage module.

When the power supply voltage is switched between positive voltage and negative voltage, the invention automatically realizes the automatic switching of zero potential between the ground of the positive voltage module and the power of the negative voltage module without adding other complex level judgment circuit modules, and can cut off the other circuit module which does not need to work, thereby protecting the circuit module from being damaged by improper power supply. The invention has simple structure, skillfully and greatly reduces the circuit switching cost and improves the switching efficiency.

Drawings

FIG. 1 is a diagram of a level control switch and a control circuit according to the present invention;

FIG. 2 is a diagram illustrating the operation of the diverter switch of FIG. 1 with positive power;

fig. 3 is a diagram of the operating state of the diverter switch shown in fig. 1 when the diverter switch is powered under negative pressure.

Detailed Description

The present invention will be described in further detail with reference to examples and drawings, but the present invention is not limited thereto.

The structure of the changeover switch circuit capable of realizing automatic changeover of the zero potential position in this embodiment is shown in fig. 1.

To better illustrate the solution in this embodiment, fig. 1 is appended with two schematic units, namely a positive voltage module and a negative voltage module, wherein the respective supply potential is required to be higher than the respective ground potential regardless of the positive voltage module and the negative voltage module, i.e. VDDP > VSSP is required for the positive voltage module and VDDN > VSSN is required for the negative voltage module. The positive pressure module and the negative pressure module are distinguished according to different power supply voltages during working, the positive pressure module refers to that the power supply voltage is a positive value (such as +5V) during normal working, and the corresponding reference is the ground (0V); the negative voltage module indicates that the power supply voltage is negative (e.g., -5V) in normal operation, and the corresponding reference is ground (0V).

The invention is mainly applied to a circuit which simultaneously comprises a positive pressure module and a negative pressure module, and requires that the positive pressure module and the negative pressure module can automatically work according to the power supply condition, and the condition that the voltage reversely adds and damages the modules can not occur. For example, in the field of power amplification driver application, there are two types of N-type and P-type power amplification driving types, and the driving voltage required by the power amplification driving types is just positive or negative.

The level control switch circuit of this embodiment includes 1 NMOS and 1 PMOS transistor each, and has 2 input ports (ports 5 and 6) and 4 output ports (ports 1, 2, 3, and 4). The 2 input ports are respectively a power supply level input (port 5) and a zero potential input (port 6), and the 4 outputs are respectively a power supply for the positive voltage module (port 3, which may also be called positive voltage module positive input), a power supply for the positive voltage module (port 1, which may also be called positive voltage module negative input or positive voltage module zero potential input), a power supply for the negative voltage module (port 2, which may also be called negative voltage module positive input or negative voltage module zero potential input), and a power supply for the negative voltage module (port 4, which may also be called negative voltage module negative input).

A control switch circuit is formed by an NMOS tube and a PMOS tube, the source electrodes (S) of the NMOS tube and the PMOS tube are connected and connected to a zero potential input end (port 6); and connecting the grid electrodes (G) of the NMOS tube and the PMOS tube and connecting the grid electrodes (G) to a chip power supply level end (a port 5). The gate (G) of the NMOS is the output port 3 and is connected to the "power" (VDDP) of the positive voltage module, and the gate (G) of the PMOS is the output port 4 and is connected to the "ground" (VSSN) of the negative voltage module. The NMOS other end output (port 1) is connected to the positive module's "ground" (VSSP), and the PMOS other end output (port 2) is connected to the negative module's "power" (VDDN).

The switching process of the changeover switch circuit in the present embodiment is described in detail below.

The following description will be given taking as an example a circuit in which the level of the power supply input branch at the port 5 is switched between a positive voltage (+ V) and a negative voltage (-V).

1. When the supply voltage is positive (+ V), as shown in fig. 2:

the grid of the NMOS tube is connected with the + V input end of the power supply branch, and the source of the NMOS tube is connected with the zero potential input end, so the grid-source voltage difference V of the NMOS tube_GS＝V_G-V_S＝+V>V_{th_n}In which V is_{th_n}The threshold starting voltage of the NMOS tube is a positive value, so that the NMOS tube is conducted; the grid of the PMOS tube is also connected with the input end V + of the power supply branch, the source of the PMOS tube is connected with the input end of zero potential, and the grid-source voltage difference V of the PMOS tube at the moment_GS＝V_G-V_S>0>V_{th_p}The starting condition (V) of PMOS is not satisfied_GS<V_{th_p}) In which V is_{th_p}The threshold turn-on voltage of the PMOS transistor is a negative value, so that the PMOS is turned off. So "zero potential" is connected from port 6 to port 1, i.e. zero potential is switched from its original position to the NMOS transistor emitter, while port 2 is disconnected.

At the moment, the positive voltage module VDDP is connected to the port 3 of the switch circuit, namely the input end of the power supply branch circuit, namely + V; VSSP is connected to port 1 of the switch circuit, i.e., ground potential 0, and VDDP > VSSP is secured so that it can operate normally.

And the negative pressure module is in an integral turn-off state because the PMOS tube is disconnected, namely the port 2 of the switching circuit is disconnected, the VDDN of the negative pressure module is in an open circuit and is not connected, and even if the VSSN is connected to the input end of the power supply branch circuit, the negative pressure module cannot work.

2. When the supply voltage is negative (-V), as shown in fig. 3:

the grid of the PMOS tube is connected with the input end-V of the power supply branch, the source of the PMOS tube is connected with the input end of zero potential, and the grid-source voltage difference V of the PMOS tube_GS＝V_G-V_S＝-V<V_{th_p}In which V is_{th_p}The threshold value starting voltage of the PMOS tube is a negative value, so that the PMOS is conducted; at this time, the gate-source voltage difference V of NMOS_GS＝V_G-V_S<0<V_{th_n}The NMOS ON condition (V) is not satisfied_GS>V_{th_n}) In which V is_{th_n}The threshold turn-on voltage of the NMOS transistor is positive, so that the NMOS is turned off. So "zero potential" is connected from port 6 to port 2, i.e. zero potential is switched from its original position to the PMOS transistor emitter, while port 1 is disconnected.

At this time, the negative voltage module VDDN is connected to the port 2 of the switch circuit, namely 0 potential; VSSN is connected to port 4 of the switching circuit, i.e. potential-V, ensuring VDDN > VSSN and therefore functioning properly.

And the positive voltage module is in an open circuit and has no connection because the switch circuit port 1 is disconnected, so that the positive voltage module cannot work even if VDDP is connected and is in an integral turn-off state.

The above process is repeated when the voltage at the input of the supply branch transitions from negative to positive again, and is not described in detail here.

In summary, the level control switch circuit of the present embodiment can automatically switch the power supply or the ground through the positive and negative changes of the power supply voltage, thereby realizing the control of the power supply/ground of the subsequent positive voltage/negative voltage circuit and ensuring the normal operation and the turn-off of the positive voltage/negative voltage circuit.

While the principles of the invention have been described in detail in connection with the preferred embodiments thereof, it will be understood by those skilled in the art that the foregoing embodiments are merely illustrative of exemplary implementations of the invention and are not limiting of the scope of the invention. The details of the embodiments are not to be interpreted as limiting the scope of the invention, and any obvious changes, such as equivalent alterations, simple substitutions and the like, based on the technical solution of the invention, can be interpreted without departing from the spirit and scope of the invention.