CN115864830A - Negative-pressure two-removal switching circuit and equipment terminal - Google Patents
Negative-pressure two-removal switching circuit and equipment terminal Download PDFInfo
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- CN115864830A CN115864830A CN202310112881.5A CN202310112881A CN115864830A CN 115864830 A CN115864830 A CN 115864830A CN 202310112881 A CN202310112881 A CN 202310112881A CN 115864830 A CN115864830 A CN 115864830A
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Abstract
The application relates to a negative pressure two-division conversion circuit and an equipment terminal, wherein the negative pressure two-division conversion circuit comprises a basic negative pressure generating unit, a negative pressure two-division conversion unit and a port gating control unit, and the negative pressure two-division conversion circuit is used for respectively gating a first end and a third end of the basic negative pressure generating unit and forming a passage between the two corresponding ports under a first group of gating control signals so as to charge the basic negative pressure generating unit and output target negative pressure by using a second end of the negative pressure two-division conversion unit; and then according to the second group of gating control signals, the second end and the fourth end of the basic negative pressure generating unit, and the first end and the third end of the negative pressure two-division converting unit are respectively gated and sequentially connected to form a passage, so that the basic negative pressure generating unit discharges and charges the negative pressure two-division converting unit, and the third end of the negative pressure two-division converting unit gates and outputs the target negative pressure at the moment, so that the symmetrical requirement of a traditional negative pressure two-division converting circuit is not needed, and the ripple wave of the output voltage is reduced.
Description
Technical Field
The application relates to the field of voltage conversion, in particular to a negative-voltage two-removing conversion circuit and an equipment terminal.
Background
The charge pump can perform high-efficiency voltage conversion on input voltage, and the principle is that the flying capacitor is used for storing charge energy of the input voltage, and then nodes at two ends of the flying capacitor are switched at proper switching frequency through the switching tube, so that the voltage conversion can be completed.
The conventional negative-voltage-divided-two charge pump is characterized in that two flying capacitors with the same capacitance value are connected in series to perform series voltage division so as to realize the voltage-divided-two function, however, if the input voltage is perfectly subjected to voltage-divided-two, the capacitance values of two capacitors which are symmetrical and the charging and discharging period which are symmetrical are usually required, if the symmetrical conditions are not met, the absolute value of the voltage of the intermediate node of the capacitor series body is not equal to half of the input voltage any more, and the ripple of the target output voltage of the negative-voltage-divided-two charge pump is overlarge at the moment.
Disclosure of Invention
In view of this, the present application provides a negative voltage divide-by-two converting circuit and a device terminal, which can reduce the ripple value corresponding to the target output voltage.
A negative voltage divide-by-two conversion circuit, comprising:
the first end of the basic negative voltage generating unit is used for connecting an input voltage during gating, the second end of the basic negative voltage generating unit is used for grounding during gating, only one end of the first end and the second end of the basic negative voltage generating unit is gated at any moment, and the third end of the basic negative voltage generating unit is used for grounding during gating of the first end of the basic negative voltage generating unit.
The first end of the negative voltage divide-by-two conversion unit is electrically connected with the fourth end of the basic negative voltage generation unit during gating, the second end of the negative voltage divide-by-two conversion unit is used for outputting target negative voltage during gating, the third end of the negative voltage divide-by-two conversion unit is used for outputting target negative voltage during gating of the first end of the negative voltage divide-by-two conversion unit, the fourth end of the negative voltage divide-by-two conversion unit is used for being grounded during gating of the second end of the negative voltage divide-by-two conversion unit, only one end of the first end and the second end of the negative voltage divide-by-two conversion unit is gated at any moment, and the target negative voltage is half of the input voltage.
And the port gating control unit is respectively and electrically connected with the respective control ends of the basic negative pressure generation unit and the negative pressure two-division conversion unit and is used for respectively outputting corresponding gating control signals to the basic negative pressure generation unit and the negative pressure two-division conversion unit.
According to the first group of gating control signals, the first end and the third end of the basic negative pressure generating unit are gated respectively and form a passage between the two corresponding ports so as to charge the basic negative pressure generating unit, and the second end and the fourth end of the negative pressure dividing and two converting unit are gated respectively and form a passage between the two corresponding ports so as to discharge the negative pressure dividing and two converting unit.
According to the second group of gating control signals, the second end and the fourth end of the basic negative pressure generating unit, and the first end and the third end of the negative pressure two-division converting unit are respectively gated and sequentially connected to form a passage, so that the basic negative pressure generating unit discharges and the negative pressure two-division converting unit charges.
In one embodiment, the basic negative pressure generating unit includes:
the first end of the first switch switching unit is used for connecting an input voltage when switching gating, the second end of the first switch switching unit is used for grounding when switching gating, and only one end of the first end and the second end of the first switch switching unit is gated at any moment.
And the first end of the first capacitor is electrically connected with the third end of the first switch switching unit.
The first end of the first switch unit is electrically connected with the first capacitor, and the second end of the first switch unit is grounded.
The control ends of the first switch switching unit and the first switch unit are respectively electrically connected with the port gating control unit.
In one embodiment, the first switching unit includes:
and the first end of the second switch unit is used for accessing the input voltage, and the second end of the second switch unit is electrically connected with the first end of the first capacitor.
And the first end of the third switching unit is electrically connected with the first end of the first capacitor, and the second end of the third switching unit is grounded.
The control ends of the second switch unit and the third switch unit are respectively electrically connected with the port gating control unit.
In one embodiment, the first switch unit adopts an NMOS tube.
In one embodiment, the second switch unit adopts a PMOS tube, and the third switch unit adopts an NMOS tube.
In one embodiment, the negative pressure divide-by-two converting unit includes:
and the first end of the second switch switching unit is electrically connected with the second end of the first capacitor when switching gating, and the second end of the second switch switching unit is used as a first voltage output end and outputs the converted voltage when gating.
And the first end of the second capacitor is electrically connected with the third end of the second switch switching unit.
And the first end of the third switch switching unit is electrically connected with the second end of the second capacitor, the second end of the third switch switching unit is used as a second voltage output end and outputs the converted voltage when switching gating, and the third end of the third switch switching unit is used for grounding when switching gating.
The control ends of the second switch switching unit and the third switch switching unit are respectively electrically connected with the port gating control unit.
In one embodiment, the second switching unit includes:
and a first end of the fourth switch unit is electrically connected with the fourth end of the basic negative pressure generating unit, and a second end of the fourth switch unit is electrically connected with the first end of the second capacitor.
And the first end of the fifth switch unit is electrically connected with the first end of the second capacitor, and the second end of the fifth switch unit is used for outputting the target negative voltage when the corresponding switch is switched on.
The control ends of the fourth switch unit and the fifth switch unit are respectively electrically connected with the port gating control unit.
In one embodiment, the third switch switching unit includes:
and a first end of the sixth switch unit is used for outputting the target negative pressure when the corresponding switch is switched on, and a second end of the sixth switch unit is used for being electrically connected with the second capacitor.
And a first end of the seventh switch unit is electrically connected with the second capacitor, and a second end of the seventh switch unit is grounded.
And the respective control ends of the sixth switching unit and the seventh switching unit are respectively electrically connected with the port gating control unit.
In one embodiment, the fourth switching unit, the fifth switching unit, the sixth switching unit and the seventh switching unit all adopt NMOS switching tubes.
An equipment terminal comprises the negative voltage two-division switching circuit.
In the negative voltage divide-by-two converting circuit, a first end of the basic negative voltage generating unit is used for connecting an input voltage during gating, a second end of the basic negative voltage generating unit is used for grounding during gating, the first end and the second end of the basic negative voltage generating unit only have one end for gating at any moment, a third end of the basic negative voltage generating unit is used for grounding during gating of the first end of the basic negative voltage generating unit, a first end of the negative voltage divide-by-two converting unit is used for being electrically connected with a fourth end of the basic negative voltage generating unit during gating, a second end of the negative voltage divide-by-two converting unit is used for outputting a target negative voltage during gating, a third end of the negative voltage divide-by-two converting unit is used for outputting the target negative voltage during gating of the first end of the negative voltage divide-by-two converting unit, a fourth end of the negative voltage divide-by-two converting unit is used for grounding during gating of the second end of the negative voltage divide-by-two converting unit, and the first end and the second end of the negative voltage divide-by-two converting unit only have one end for gating at any moment, the target negative pressure is half of the input voltage, the port gating control unit is respectively and electrically connected with the control ends of the basic negative pressure generating unit and the negative pressure dividing and converting unit and is used for respectively outputting corresponding gating control signals to the basic negative pressure generating unit and the negative pressure dividing and converting unit, according to the first group of gating control signals, the first end and the third end of the basic negative pressure generating unit are respectively gated and form a passage between the corresponding two ports so as to charge the basic negative pressure generating unit, the second end and the fourth end of the negative pressure dividing and converting unit are respectively gated and form a passage between the corresponding two ports so as to discharge the negative pressure dividing and converting unit, according to the second group of gating control signals, the second end, the fourth end of the basic negative pressure generating unit, the first end and the third end of the negative pressure dividing and converting unit are respectively gated and sequentially connected into a passage, the negative pressure divide-by-two conversion circuit is used for respectively gating the first end and the third end of the basic negative pressure generation unit and forming a passage between the two corresponding ports under a first group of gating control signals so as to charge the basic negative pressure generation unit and output target negative pressure by the second end of the negative pressure divide-by-two conversion unit; then according to a second group of gating control signals, a second end, a fourth end, a first end and a third end of the negative pressure two-division conversion unit of the basic negative pressure generation unit are respectively gated and sequentially connected to form a passage, so that the basic negative pressure generation unit discharges and charges the negative pressure two-division conversion unit, the third end of the negative pressure two-division conversion unit gates and outputs target negative pressure, namely the target negative pressure of the negative pressure two-division conversion unit is always half of the input voltage and keeps unchanged, when the load is relatively small, the negative pressure two-division conversion unit can be controlled to be in a discharging state for a long time by adjusting the cycle duration of the first group of gating control signals and the second gating control signals, the negative pressure two-division conversion unit is only adjusted to be in a charging state when the corresponding target negative pressure is insufficient, the switching frequency of the whole negative pressure two-division conversion circuit is reduced, and the ripple value of the corresponding target negative pressure can be controlled by controlling the charging duration of the negative pressure two-division conversion unit; when the load is relatively large, full-time energy supply output of the target negative pressure can be achieved, the ripple of the target negative pressure is equal to half of the ripple value of the traditional negative pressure except the two charge pumps, namely the traditional negative pressure is not needed to be used for the symmetrical requirement of the two conversion circuits, and the ripple of the output voltage is reduced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a circuit block diagram of a negative voltage divide-by-two conversion circuit provided in an embodiment of the present application;
fig. 2 is a schematic circuit structure diagram of a negative voltage divide-by-two conversion circuit according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application are clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. Based on the embodiments in the present application. The following embodiments and their technical features may be combined with each other without conflict.
As shown in fig. 1, a negative voltage divide-by-two converting circuit 100 is provided, the negative voltage divide-by-two converting circuit 100 includes: a basic negative pressure generating unit 110, a negative pressure divide-by-two converting unit 120, and a port gating control unit 130.
The first end 1a of the basic negative voltage generation unit 110 is used for accessing an input voltage during gating, the second end 1b of the basic negative voltage generation unit 110 is used for grounding during gating, only one end of the first end 1a and the second end 1b of the basic negative voltage generation unit 110 is gated at any time, and the third end 1c of the basic negative voltage generation unit 110 is used for grounding during gating of the first end 1a of the basic negative voltage generation unit 110.
The first end 2a of the negative voltage divide-by-two converting unit 120 is used for being electrically connected with the fourth end 1d of the basic negative voltage generating unit 110 during gating, the second end 2b of the negative voltage divide-by-two converting unit 120 is used for outputting a target negative voltage during gating, the third end 2c of the negative voltage divide-by-two converting unit 120 is used for outputting the target negative voltage during gating of the first end 2a of the negative voltage divide-by-two converting unit 120, the fourth end 2d of the negative voltage divide-by-two converting unit 120 is used for being grounded during gating of the second end 2b of the negative voltage divide-by-two converting unit 120, only one end of the first end 2a and the second end 2b of the negative voltage divide-by-two converting unit 120 is gated at any moment, and the target negative voltage is half of the input voltage.
The port gating control unit 130 is electrically connected to respective control terminals of the basic negative pressure generating unit 110 and the negative pressure two-division converting unit 120, and is configured to output corresponding gating control signals to the basic negative pressure generating unit 110 and the negative pressure two-division converting unit 120, respectively.
According to the first group of gating control signals, the first end 1a and the third end of the basic negative voltage generation unit 110 are respectively gated and form a passage between the two corresponding ports so as to charge the basic negative voltage generation unit 110, and the second end 2b and the fourth end of the negative voltage two-division conversion unit 120 are respectively gated and form a passage between the two corresponding ports so as to discharge the negative voltage two-division conversion unit 120.
According to the second group of gate control signals, the second terminal 1b and the fourth terminal 1d of the basic negative voltage generation unit 110 and the first terminal 2a and the third terminal 2c of the negative voltage divide-by-two conversion unit 120 are respectively gated and sequentially connected to form a path, so that the basic negative voltage generation unit 110 discharges and the negative voltage divide-by-two conversion unit 120 charges.
When the first group strobe control signal operates, the port strobe control unit 130 transmits the first group strobe control signal to the control terminal of the basic negative voltage generation unit 110 and the control terminal of the negative voltage divide-by-two conversion unit 120, respectively.
When the second gating control signal operates, the port gating control unit 130 sends the second gating control signal to the control terminal 1e of the basic negative voltage generating unit 110 and the control terminal 2e of the negative voltage divide-by-two converting unit 120, respectively.
It should be noted that, the control terminal 1e of the basic negative pressure generating unit 110 and the control terminal 2e of the negative pressure divide-by-two converting unit 120 may each include a plurality of ports, and for convenience, in fig. 1, the control terminal of the basic negative pressure generating unit 110 is only denoted by 1e, and the control terminal of the negative pressure divide-by-two converting unit 120 is denoted by 2e.
When the first end 1a of the basic negative voltage generation unit 110 is connected to the input voltage, the third end 1c of the basic negative voltage generation unit 110 is grounded, the second end 1b of the basic negative voltage generation unit 110 is not gated, and since the third end 1c of the basic negative voltage generation unit 110 is grounded, a path is formed between the first end 1a and the third end 1c of the basic negative voltage generation unit 110, and the basic negative voltage generation unit 110 is equivalent to charging.
When the basic negative voltage generating unit 110 is charged, the second terminal 2b of the negative voltage divide-by-two converting unit 120 gates and outputs the target negative voltage, the fourth terminal 2d of the negative voltage divide-by-two converting unit 120 is grounded, the second terminal 2b and the fourth terminal 2d of the negative voltage divide-by-two converting unit 120 form a path, the negative voltage divide-by-two converting unit 120 discharges, and the second terminal 2b of the negative voltage divide-by-two converting unit 120 outputs the target negative voltage.
When the second end 1b of the basic negative pressure generating unit 110 is grounded, the first end 1a of the basic negative pressure generating unit 110 and the first end 1c of the basic negative pressure generating unit 110 are not gated, the first end 2a of the negative pressure divide-by-two converting unit 120 is gated and electrically connected with the fourth end 1d of the basic negative pressure generating unit 110, the third end 2c of the negative pressure divide-by-two converting unit 120 outputs the target negative pressure, at this time, the second end 1b and the fourth end 1d of the basic negative pressure generating unit 110, the first end 2a and the third end 2c of the negative pressure divide-by-two converting unit 120 are respectively gated and sequentially connected to form a passage, so that the basic negative pressure generating unit 110 discharges and charges the negative pressure divide-by-two converting unit 120, and at this time, the third end of the negative pressure divide-by-two converting unit 120 is gated and outputs the target negative pressure.
The negative voltage divide-by-two converting circuit 100 charges the basic negative voltage generating unit 110 by gating the first terminal and the third terminal of the basic negative voltage generating unit 110 and forming a path between the two corresponding ports by using the first group of gating control signals, and divides the second terminal of the second converting unit 120 by using the negative voltage to output the target negative voltage; then according to the second group of gating control signals, the second end 1b, the fourth end 1d of the basic negative pressure generating unit 110, the first end 2a of the negative pressure divide-by-two converting unit 120 and the third end 2c are respectively gated and sequentially connected to form a channel, so that the basic negative pressure generating unit 110 discharges and the negative pressure divide-by-two converting unit 120 charges, at this time, the third end of the negative pressure divide-by-two converting unit 120 gates and outputs a target negative pressure, namely, the target negative pressure of the negative pressure divide-by-two converting unit 120 is always half of the input voltage and remains unchanged, when the load is relatively small, the negative pressure divide-by-two converting unit 120 can be controlled to be in a discharging state for a long time by adjusting the cycle duration of the first group of gating control signals and the second gating control signals, only when the corresponding output target negative pressure is insufficient, the negative pressure divide-by-two converting unit 120 is adjusted to be in a charging state, the switching frequency of the whole negative pressure divide-by controlling the charging duration of the negative pressure divide-by-two converting unit 120 can be controlled to control the ripple value of the target negative pressure; when the load is relatively large, full-time energy supply output of the target negative pressure can be achieved, the ripple of the target negative pressure is equal to half of the ripple value of the traditional negative pressure divided by the two charge pumps, namely the traditional negative pressure is not required to divide the symmetry requirement of the two conversion circuits 100, and the ripple of the output voltage is reduced on the whole.
In one embodiment, as shown in fig. 2, the basic negative pressure generating unit 110 includes: a first switch switching unit 111, a first capacitor C1, and a first switch unit 112.
The first terminal of the first switch switching unit 111 is used for accessing an input voltage when switching gating, the second terminal of the first switch switching unit 111 is used for grounding when switching gating, and only one terminal of the first terminal and the second terminal of the first switch switching unit 111 is gated at any time.
The first end of the first capacitor C1 is electrically connected to the third end of the first switch switching unit 111.
The first end of the first switch unit 112 is electrically connected to the first capacitor C1, the second end of the first switch unit 112 is grounded, and the control end of the first switch unit 112 is electrically connected to the port gating control unit 130.
In this embodiment, the first terminal of the first switch switching unit 111 corresponds to the first terminal 1a of the basic negative voltage generating unit 110, the second terminal of the first switch switching unit 111 corresponds to the second terminal 1b of the basic negative voltage generating unit 110, the second terminal of the first switch unit 112 corresponds to the third terminal 1C of the basic negative voltage generating unit 110, the second terminal of the first capacitor C1 corresponds to the fourth terminal 1d of the basic negative voltage generating unit 110, and the control terminal 1e of the basic negative voltage generating unit 110 includes respective control terminals of the first switch switching unit 111 and the first switch unit 112.
In this embodiment, when the first terminal of the first switch switching unit 111 switches the gate to access the input voltage, the second terminal of the first switch unit 112 is grounded, and at this time, the first capacitor C1 is charged and stores energy until the voltages at the two terminals of the first capacitor C1 are the same as the input voltage, and at this time, the fourth terminal 1d of the basic negative voltage generating unit 110 (i.e., the second terminal of the first capacitor C1) is not electrically connected to the first terminal 2a of the negative voltage divided by two converting unit 120, i.e., the first terminal 2a of the negative voltage divided by two converting unit 120 is not gated; the second terminal 2b and the fourth terminal 2d of the negative voltage divide-by-two converting unit 120 form a path so that the negative voltage divide-by-two converting unit 120 performs discharging.
Similarly, when the second terminal of the first switch switching unit 111 is grounded, the first capacitor C1 and the first terminal 2a and the third terminal 2C of the negative voltage divide-by-two converting unit 120 are respectively gated and sequentially connected to form a path, so that the basic negative voltage generating unit 110 discharges and the negative voltage divide-by-two converting unit 120 charges.
The first capacitor C1 is an energy storage element, and through the cooperation of the first switch switching unit 111, the first capacitor C1 and the first switch unit 112, the target negative voltage of the negative voltage-divided-by-two conversion unit 120 is always half of the input voltage and remains unchanged, thereby reducing the ripple of the output voltage.
In one embodiment, as shown in fig. 2, the first switch switching unit 111 includes: a second switching unit 113 and a third switching unit 114.
A first end of the second switch unit 113 is used for receiving an input voltage, and a second end of the second switch unit 113 is electrically connected to a first end of the first capacitor C1.
A first end of the third switching unit 114 is electrically connected to the first end of the first capacitor C1, and a second end of the third switching unit 114 is grounded.
In this embodiment, the control terminals of the second switch unit 113 and the third switch unit 114 are electrically connected to the port gating control unit 130, respectively.
In one embodiment, as shown in fig. 2, the first switch unit 112 employs an NMOS transistor N1.
In this embodiment, the first terminal of the first switch unit 112 is a drain of the NMOS transistor N1, the second terminal of the first switch unit 112 is a source of the NMOS transistor N1, and the control terminal of the first switch unit 112 is a gate of the NMOS transistor N1.
In one embodiment, as shown in fig. 2, the second switching unit 113 employs a PMOS transistor P1, and the third switching unit 114 employs an NMOS transistor N2.
In this embodiment, the first end of the PMOS transistor of the second switch unit 113 is the source of the PMOS transistor P1, the second end of the PMOS transistor of the second switch unit 113 is the drain of the PMOS transistor P1, the control end of the second switch unit 113 is the gate of the PMOS transistor P1, and the gate of the PMOS transistor P1 is electrically connected to the port gating control unit 130.
In this embodiment, the first end of the third switching unit 114 is a source of the NMOS transistor N2, the second end of the third switching unit 114 is a drain of the NMOS transistor N2, the control end of the first switching unit 114 is a gate of the NMOS transistor N2, and the gate of the NMOS transistor N2 is electrically connected to the port gating control unit 130.
In this embodiment, the charge and discharge states of the first capacitor C1 are switched by the cooperation of the PMOS transistor P1 and the NMOS transistor N2.
In one embodiment, as shown in fig. 2, the negative voltage divide-by-two converting unit 120 includes a second switching unit 121, a second capacitor C2, and a third switching unit 122.
The first end of the second switch switching unit 121 is used to be electrically connected to the second end of the first capacitor C1 when switching gating, and the second end of the second switch switching unit 121 is used as a first voltage output end and outputs the converted voltage when gating.
The first end of the second capacitor is electrically connected to the third end of the second switch unit 121.
The first end of the third switching unit 122 is electrically connected to the second end of the second capacitor, the second end of the third switching unit 122 is used as a second voltage output end and outputs the converted voltage when switching the gate, and the third end of the third switching unit 122 is used for grounding when switching the gate.
The control terminals of the second switch switching unit 121 and the third switch switching unit 122 are electrically connected to the port gating control unit 130, respectively.
In this embodiment, the control terminal 2e of the negative voltage divide-by-two converting unit 120 includes respective control terminals of the second switch switching unit 121 and the third switch switching unit 122.
In one embodiment, as shown in fig. 2, the second switching unit 121 includes a fourth switching unit 121a and a fifth switching unit 121b.
A first terminal of the fourth switching unit 121a is electrically connected to the fourth terminal 1d of the basic negative voltage generating unit 110, and a second terminal of the fourth switching unit 121a is electrically connected to the first terminal of the second capacitor.
A first end of the fifth switch unit 121b is electrically connected to the first end of the second capacitor, and a second end of the fifth switch unit 121b is used for outputting the target negative voltage when the corresponding switch is turned on.
In one embodiment, as shown in fig. 2, the third switching unit 122 includes a sixth switching unit 122a and a seventh switching unit 122b.
A first end of the sixth switching unit 122a is configured to output a target negative voltage when the corresponding switch is turned on, and a second end of the sixth switching unit 122a is configured to be electrically connected to the second capacitor;
the first terminal of the seventh switch unit 122b is electrically connected to the second capacitor, and the second terminal of the seventh switch unit 122b is grounded.
The control terminals of the sixth switching unit 122a and the seventh switching unit 122b are electrically connected to the port gating control unit 130, respectively.
In one embodiment, as shown in fig. 2, the fourth switching unit 121a, the fifth switching unit 121b, the sixth switching unit 122a and the seventh switching unit 122b all employ NMOS switching tubes, where the fourth switching unit 121a is represented by an NMOS tube N3, the fifth switching unit 121b is represented by an N4, the sixth switching unit 122a is represented by an N5, and the seventh switching unit 122b is represented by an N6.
In this embodiment, the first end of the fourth switching unit 121a is a drain of the NMOS transistor N3, the second end of the fourth switching unit 121a is a source of the NMOS transistor N3, the control end of the fourth switching unit 121a is a gate of the NMOS transistor N3, and the gate of the NMOS transistor N3 is electrically connected to the port gating control unit 130.
In this embodiment, the first end of the fifth switch unit 121b is the drain of the NMOS transistor N4, the second end of the fifth switch unit 121b is the source of the NMOS transistor N4, the control end of the fifth switch unit 121b is the gate of the NMOS transistor N4, and the gate of the NMOS transistor N4 is electrically connected to the port gating control unit 130.
In this embodiment, the first end of the sixth switching unit 122a is a source of the NMOS transistor N5, the second end of the sixth switching unit 122a is a drain of the NMOS transistor N5, the control end of the sixth switching unit 122a is a gate of the NMOS transistor N5, and the gate of the NMOS transistor N5 is electrically connected to the port gating control unit 130.
In this embodiment, the first end of the seventh switch unit 122b is the source of the NMOS transistor N6, the second end of the seventh switch unit 122b is the drain of the NMOS transistor N6, the control end of the seventh switch unit 122b is the gate of the NMOS transistor N6, and the gate of the NMOS transistor N6 is electrically connected to the port gating control unit 130.
For convenience of illustration, the connections between the gates of the switching tubes and the port gating control unit 130 are not directly shown in fig. 2.
In this embodiment, the charging and discharging states of the second capacitor C2 are switched by the cooperation of the switching tubes.
In another embodiment, as shown in fig. 2, a negative voltage divide-by-two converter circuit 100 is provided, the negative voltage divide-by-two converter circuit 100 comprising: the basic negative voltage generating unit 110, the negative voltage divide-by-two converting unit 120 and the port gating control unit 130, the basic negative voltage generating unit 110 includes a first switch switching unit 111, a first capacitor C1 and a first switch unit 112, the first switch switching unit 111 includes: the first switch unit 112 adopts an NMOS transistor N1, the second switch unit 113 adopts a PMOS transistor P1, the third switch unit 114 adopts an NMOS transistor N2, the negative voltage divide-by-two converting unit 120 includes a second switch switching unit 121, a second capacitor C2 and a third switch switching unit 122, the second switch switching unit 121 includes a fourth switch unit 121a and a fifth switch unit 121b, the third switch switching unit 122 includes a sixth switch unit 122a and a seventh switch unit 122b, and the fourth switch unit 121a, the fifth switch unit 121b, the sixth switch unit 122a and the seventh switch unit 122b all adopt NMOS switch transistors.
The first group of gating control signals comprise grid control signals of an NMOS tube N1, grid control signals of a PMOS tube P1, grid control signals of an NMOS tube N4 and a NMOS tube N6 at the moment, the grid control signals of the PMOS tube P1 are low-level signals, the grid control signals of the NMOS tube N1, the NMOS tube N4 and the NMOS tube N6 are all high-level signals, at the moment, the NMOS tube N1, the NMOS tube N4 and the NMOS tube N6 work, the PMOS tube P1 works, and the rest of the switch tubes do not work.
The second group of gating control signals comprise grid control signals of an NMOS tube N2, grid control signals of an NMOS tube N3 and grid control signals of an NMOS tube N5, the grid control signals of the NMOS tube N2, the NMOS tube N3 and the NMOS tube N5 are all high-level signals, at the moment, the NMOS tube N2, the NMOS tube N3 and the NMOS tube N5 work, and the rest of switch tubes do not work.
An equipment terminal comprises the negative voltage divide-by-two conversion circuit 100.
The division of each unit in the negative voltage two-division switching circuit 100 is only for illustration, and in other embodiments, the negative voltage two-division switching circuit 100 may be divided into different units as needed to complete all or part of the functions of the negative voltage two-division switching circuit 100. For the specific limitation of the negative voltage-divided-by-two conversion circuit 100, reference may be made to the above limitation of the method, and details are not described herein again.
That is, the above embodiments are only examples of the present application, and not intended to limit the scope of the present application, and all equivalent structures or equivalent flow transformations made by the contents of the specification and drawings of the present application, such as mutual combination of technical features between the embodiments, or direct or indirect application to other related technical fields, are included in the scope of the present application.
In addition, structural elements having the same or similar characteristics may be identified by the same or different reference numerals. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
In this application, the word "for example" is used to mean "serving as an example, instance, or illustration". Any embodiment described herein as "for example" is not necessarily to be construed as preferred or advantageous over other embodiments. The previous description is provided to enable any person skilled in the art to make and use the present application. In the foregoing description, various details have been set forth for the purpose of explanation.
It will be apparent to one of ordinary skill in the art that the present application may be practiced without these specific details. In other instances, well-known structures and processes are not shown in detail to avoid obscuring the description of the present application with unnecessary detail. Thus, the present application is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed herein.
Claims (10)
1. A negative voltage two-removing switching circuit is characterized by comprising:
the first end of the basic negative pressure generating unit is used for accessing an input voltage during gating, the second end of the basic negative pressure generating unit is used for grounding during gating, only one end of the first end and the second end of the basic negative pressure generating unit is gated at any moment, and the third end of the basic negative pressure generating unit is used for grounding during gating of the first end of the basic negative pressure generating unit;
the first end of the negative-pressure-divided-two conversion unit is electrically connected with the fourth end of the basic negative-pressure generation unit during gating, the second end of the negative-pressure-divided-two conversion unit is used for outputting a target negative pressure during gating, the third end of the negative-pressure-divided-two conversion unit is used for outputting the target negative pressure during gating of the first end of the negative-pressure-divided-two conversion unit, the fourth end of the negative-pressure-divided-two conversion unit is used for grounding during gating of the second end of the negative-pressure-divided-two conversion unit, only one end of the first end and the second end of the negative-pressure-divided-two conversion unit is gated at any moment, and the target negative pressure is half of the input voltage;
the port gating control unit is respectively and electrically connected with the respective control ends of the basic negative pressure generation unit and the negative pressure two-division conversion unit and is used for respectively outputting corresponding gating control signals to the basic negative pressure generation unit and the negative pressure two-division conversion unit;
according to a first group of gating control signals, a first end and a third end of the basic negative pressure generating unit are gated respectively and form a passage between the two corresponding ports so as to charge the basic negative pressure generating unit, and a second end and a fourth end of the negative pressure two-division converting unit are gated respectively and form a passage between the two corresponding ports so as to discharge the negative pressure two-division converting unit;
according to a second group of gating control signals, the second end and the fourth end of the basic negative pressure generating unit, and the first end and the third end of the negative pressure two-division converting unit are respectively gated and sequentially connected to form a passage, so that the basic negative pressure generating unit discharges and the negative pressure two-division converting unit charges.
2. The negative voltage divide-by-two conversion circuit of claim 1, wherein the basic negative voltage generating unit comprises:
the first end of the first switch switching unit is used for accessing the input voltage when switching gating, the second end of the first switch switching unit is used for grounding when switching gating, and only one end of the first end and the second end of the first switch switching unit is gated at any moment;
a first end of the first capacitor is electrically connected with a third end of the first switch switching unit;
a first end of the first switch unit is electrically connected with the first capacitor, and a second end of the first switch unit is grounded;
the control ends of the first switch switching unit and the first switch unit are respectively electrically connected with the port gating control unit.
3. The negative voltage divide-by-two converting circuit according to claim 2, wherein the first switch switching unit comprises:
a first end of the second switch unit is used for connecting the input voltage, and a second end of the second switch unit is electrically connected with the first end of the first capacitor;
a first end of the third switching unit is electrically connected with the first end of the first capacitor, and a second end of the third switching unit is grounded;
the control ends of the second switch unit and the third switch unit are respectively electrically connected with the port gating control unit.
4. The negative voltage divide-by-two converting circuit of claim 2, wherein the first switch unit adopts an NMOS transistor.
5. The negative voltage divide-by-two switching circuit according to claim 3, wherein the second switching unit employs a PMOS transistor, and the third switching unit employs an NMOS transistor.
6. The negative voltage divide-by-two converting circuit according to claim 2, wherein the negative voltage divide-by-two converting unit comprises:
a first end of the second switch switching unit is used for being electrically connected with a second end of the first capacitor when switching gating, and the second end of the second switch switching unit is used as a first voltage output end and outputs converted voltage when gating;
a first end of the second capacitor is electrically connected with a third end of the second switch switching unit;
a first end of the third switch switching unit is electrically connected with a second end of the second capacitor, the second end of the third switch switching unit is used as a second voltage output end and outputs the converted voltage when switching gating, and a third end of the third switch switching unit is used for grounding when switching gating;
the control ends of the second switch switching unit and the third switch switching unit are respectively electrically connected with the port gating control unit.
7. The negative voltage divide-by-two conversion circuit of claim 6, wherein the second switch switching unit comprises:
a first end of the fourth switching unit is electrically connected with the fourth end of the basic negative voltage generation unit, and a second end of the fourth switching unit is electrically connected with the first end of the second capacitor;
a fifth switch unit, a first end of which is electrically connected to the first end of the second capacitor, and a second end of which is used for outputting the target negative voltage when the corresponding switch is turned on;
and the control ends of the fourth switch unit and the fifth switch unit are respectively electrically connected with the port gating control unit.
8. The negative voltage divide-by-two conversion circuit according to claim 7, wherein the third switch switching unit includes:
a sixth switch unit, a first end of which is used for outputting the target negative voltage when the corresponding switch is turned on, and a second end of which is used for being electrically connected with the second capacitor;
a seventh switch unit, a first end of which is electrically connected to the second capacitor, and a second end of which is grounded;
and the respective control ends of the sixth switching unit and the seventh switching unit are electrically connected with the port gating control unit respectively.
9. The negative voltage divide-by-two converting circuit of claim 8, wherein the fourth, fifth, sixth and seventh switching units all employ NMOS switching tubes.
10. An equipment terminal, characterized in that it comprises a negative voltage divide-by-two converting circuit according to any one of claims 1 to 9.
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| CN202310112881.5A CN115864830B (en) | 2023-02-15 | 2023-02-15 | Negative pressure divides two conversion circuit and equipment terminal |
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| CN202310112881.5A CN115864830B (en) | 2023-02-15 | 2023-02-15 | Negative pressure divides two conversion circuit and equipment terminal |
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| CN115864830B CN115864830B (en) | 2023-06-02 |
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