CN217215947U - Positive and negative voltage protection circuit and active pen - Google Patents
Positive and negative voltage protection circuit and active pen Download PDFInfo
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- CN217215947U CN217215947U CN202220176579.7U CN202220176579U CN217215947U CN 217215947 U CN217215947 U CN 217215947U CN 202220176579 U CN202220176579 U CN 202220176579U CN 217215947 U CN217215947 U CN 217215947U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
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Abstract
The utility model discloses a positive and negative voltage protection circuit and an active pen, wherein the circuit comprises a voltage stabilization control circuit, a first switch circuit, a second switch circuit, an input terminal anode, an input terminal cathode, an output terminal anode and an output terminal cathode; the positive pole of the input end is respectively connected with the voltage stabilization control circuit and the first switch circuit, the first switch circuit is connected with the voltage stabilization control circuit, the first switch circuit is connected with the positive pole of the output end, the negative pole of the input end is respectively connected with the voltage stabilization control circuit and the second switch circuit, the second switch circuit is connected with the voltage stabilization control circuit, and the second switch circuit is connected with the negative pole of the output end; the voltage stabilizing control circuit determines the connection and disconnection of the first switch circuit and the second switch circuit according to the voltages of the anode of the input end and the cathode of the input end. The utility model provides an insert too big voltage or reverse voltage and influence initiative pen life's problem when owing to initiative pen charges.
Description
Technical Field
The utility model relates to a protection circuit field, in particular to positive negative voltage protection circuit and initiative pen.
Background
The service life of the active pen is related to the voltage accessed during the working process of the active pen, and the active pen is damaged when the accessed voltage is too large or the reverse voltage is accessed, so that the service life of the active pen is shortened.
The existing active pen charging interface lacks a protection circuit, and the active pen may be connected with excessive voltage or reverse voltage when being charged, so that the service life of the active pen is influenced.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a positive negative voltage protection circuit and initiative pen, aim at solving because the problem that inserts too big voltage or reverse voltage and influence initiative pen life when the initiative pen charges.
In order to achieve the above object, the utility model provides a positive negative voltage protection circuit is used for the interface that charges, include: the voltage stabilizing control circuit comprises a voltage stabilizing control circuit, a first switch circuit, a second switch circuit, an input end anode, an input end cathode, an output end anode and an output end cathode;
the input ends of the voltage stabilization control circuit and the first switch circuit are respectively connected with the positive electrode of the input end, the controlled end of the first switch circuit is connected with the voltage stabilization control circuit, the output end of the first switch circuit is connected with the positive electrode of the output end, the input ends of the voltage stabilization control circuit and the second switch circuit are respectively connected with the negative electrode of the input end, the controlled end of the second switch circuit is connected with the voltage stabilization control circuit, and the output end of the second switch circuit is connected with the negative electrode of the output end;
when the positive pole and the negative pole of the input end are connected with a forward voltage, the voltage stabilizing control circuit controls the second switch circuit to be switched on, and when the input end of the positive and negative voltage protection circuit is connected with a reverse voltage, the voltage stabilizing control circuit controls the second switch circuit to be switched off;
when the voltage value of the positive pole and the negative pole of the input end are connected in the positive direction and the negative pole of the input end are lower than the clamping voltage of the voltage stabilizing control circuit, the voltage stabilizing control circuit controls the first switch circuit to be switched on, and when the voltage value of the positive pole and the negative pole of the input end are connected in the positive direction and the negative pole of the positive voltage protection circuit are higher than the clamping voltage of the voltage stabilizing control circuit, the voltage stabilizing control circuit controls the first switch circuit to be switched off.
Optionally, the voltage stabilizing control circuit includes a first resistor, a second resistor, a third resistor, a first diode and a first MOS transistor, the anode of the input terminal is connected to the first end of the first resistor, the first end of the second resistor and the source of the first MOS transistor, the second end of the first resistor, the second end of the second resistor and the gate of the first MOS transistor are interconnected to the cathode of the first diode, the anode of the first diode and the first end of the third resistor are grounded, and the second end of the third resistor is connected to the drain of the first MOS transistor.
Optionally, the first switch circuit includes a second MOS transistor, the second MOS transistor is a P-type MOS transistor, a source of the second MOS transistor is connected to the input terminal anode, a drain of the second MOS transistor is connected to the output terminal anode, and a gate of the second MOS transistor is connected to the drain of the first MOS transistor.
Optionally, the second switch circuit includes a third MOS transistor, the third MOS transistor is an N-type MOS transistor, a drain of the third MOS transistor is connected to the negative electrode of the input terminal, a source of the third MOS transistor is connected to the negative electrode of the output terminal, and a gate of the third MOS transistor is connected to the cathode of the first diode.
Optionally, the positive and negative voltage protection circuit further includes a fourth MOS transistor and a fifth MOS transistor, the fourth MOS transistor is a P-type MOS transistor, the fifth MOS transistor is an N-type MOS transistor, a gate of the fourth MOS transistor is connected to a gate of the second MOS transistor, a source of the fourth MOS transistor is connected to a drain of the second MOS transistor, a drain of the fourth MOS transistor is connected to a source of the second MOS transistor, a gate of the fifth MOS transistor is connected to a gate of the third MOS transistor, a source of the fifth MOS transistor is connected to a drain of the third MOS transistor, and a drain of the fifth MOS transistor is connected to a source of the third MOS transistor.
Optionally, the positive-negative voltage protection circuit further includes a second diode, an anode of the second diode is connected to the cathode of the input terminal, and the second diode is connected to the anode of the input terminal.
Optionally, the positive and negative voltage protection circuit further includes a voltage stabilizing unit;
the voltage stabilizing unit comprises a first capacitor and a fourth resistor, wherein a first end of the first capacitor and a first end of the fourth resistor are connected with the anode of the output end, and a second end of the first capacitor and a second end of the fourth resistor are grounded.
The utility model provides an initiative pen, initiative pen includes as above the positive and negative voltage protection circuit.
The utility model discloses a set up steady voltage control circuit, first switch circuit, second switch circuit, input positive pole, input negative pole, output positive pole and output negative pole, the input positive pole respectively with steady voltage control circuit reaches the input of first switch circuit is connected, the controlled end of first switch circuit with steady voltage control circuit is connected, the output of first switch circuit with the output positive pole is connected, the input negative pole respectively with steady voltage control circuit and the input of second switch circuit is connected, the controlled end of second switch circuit with steady voltage control circuit is connected, the output of second switch circuit with the output negative pole is connected; the positive pole and the negative pole of the input end are used for accessing voltage, when the accessed voltage is inconsistent with the corresponding polarity of the input end, when the input end is reversely connected with voltage, the voltage stabilizing control circuit controls the second switch circuit to be switched off, the positive and negative voltage protection circuit is not conducted, no voltage is output from the output end, when the connected voltage is consistent with the corresponding polarity of the input end, when the input end is positively connected with voltage, the voltage-stabilizing control circuit controls the second switch circuit to be conducted, when the connected voltage value is higher than the clamping voltage of the voltage-stabilizing control circuit, the voltage-stabilizing control circuit controls the first switch circuit to be turned off, the positive and negative voltage protection circuit is not conducted, the output end has no voltage output, when the input end is positively connected and the connected voltage value is lower than the clamping voltage of the voltage stabilization control circuit, the first switch circuit and the second switch circuit are conducted, the negative voltage protection circuit is conducted, and the output end outputs voltage. Compared with a charging interface without protection voltage in the background technology, the protection circuit avoids the influence on the service life of the active pen due to the access of excessive voltage or reverse voltage in the charging process.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic diagram of functional modules of an embodiment of the positive and negative voltage protection circuit of the present invention;
fig. 2 is a schematic circuit diagram of an embodiment of the positive and negative voltage protection circuit of the present invention.
The reference numbers illustrate:
| reference numerals | Name(s) | Reference numerals | Name(s) |
| 10 | Voltage |
20 | |
| 30 | Second switch circuit | R1-R3 | First resistor-third resistor |
| D1-D2 | First diode-second diode | C1 | First capacitor |
| Q1-Q4 | First MOS transistor-fourth MOS transistor |
The realization, the functional characteristics and the advantages of the utility model are further explained by combining the embodiment and referring to the attached drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that, if directional indications (such as upper, lower, left, right, front and rear … …) are involved in the embodiments of the present invention, the directional indications are only used for explaining the relative position relationship between the components, the motion situation, etc. under a certain posture (as shown in the drawings), and if the certain posture is changed, the directional indications are changed accordingly.
In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is 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 at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
The utility model provides a positive negative voltage protection circuit is applicable to in the interface that charges.
The existing active pen charging interface lacks a protection circuit, and the active pen may be connected with excessive voltage or reverse voltage when being charged, so that the service life of the active pen is influenced.
Referring to fig. 1, in an embodiment of the present invention, the positive-negative voltage protection circuit is used for a charging interface, including: the voltage stabilizing control circuit comprises a voltage stabilizing control circuit 10, a first switch circuit 20, a second switch circuit 30, an input end anode, an input end cathode, an output end anode and an output end cathode;
the input ends of the voltage stabilization control circuit 10 and the first switch circuit 20 are respectively connected with the positive electrode of the input end, the controlled end of the first switch circuit 20 is connected with the voltage stabilization control circuit 10, the output end of the first switch circuit 20 is connected with the positive electrode of the output end, the input ends of the voltage stabilization control circuit 10 and the second switch circuit 30 are respectively connected with the negative electrode of the input end, the controlled end of the second switch circuit 30 is connected with the voltage stabilization control circuit 10, and the output end of the second switch circuit 30 is connected with the negative electrode of the output end;
when the positive electrode and the negative electrode of the input end are connected with a forward voltage, the voltage stabilizing control circuit 10 controls the second switch circuit 30 to be switched on, and when the input end of the positive and negative voltage protection circuit is connected with a reverse voltage, the voltage stabilizing control circuit 10 controls the second switch circuit 30 to be switched off;
when the voltage value of the positive pole and the negative pole of the input end are accessed in the forward direction and is lower than the clamping voltage of the voltage stabilizing control circuit 10, the voltage stabilizing control circuit 10 controls the first switch circuit 20 to be switched on, and when the voltage value of the positive pole and the negative pole of the input end are accessed in the forward direction and is higher than the clamping voltage of the voltage stabilizing control circuit 10, the voltage stabilizing control circuit 10 controls the first switch circuit 20 to be switched off.
Specifically, when the input terminals of the positive and negative voltage protection circuits are reversely connected, the second switch circuit 30 is turned off, and no voltage is output from the positive and negative voltage protection circuits; when the input end of the positive and negative voltage protection circuit is positively connected and the input voltage is higher than the clamping voltage of the voltage stabilization control circuit 10, the first switch circuit 20 is turned off, the second switch circuit 30 is turned on, and no voltage is output from the positive and negative voltage protection circuit; when the input end of the positive and negative voltage protection circuit is connected positively and the input voltage is lower than the clamping voltage of the voltage stabilization control circuit 10, the first switch circuit 20 is turned on, the second switch circuit 30 is turned on, and the positive and negative voltage protection circuit outputs voltage.
In the present embodiment, the first switch circuit 20 and the second switch circuit 30 are used to control the output of the voltage at the input terminal, and the positive and negative voltage protection circuit outputs the voltage when the first switch circuit 20 and the second switch circuit 30 are simultaneously turned on.
The voltage stabilization control circuit 10 is configured to receive a voltage at an input end, control the first switch circuit 20 and the second switch circuit 30 to be turned on and off according to a magnitude and a polarity of a voltage value at two ends of the voltage stabilization control circuit 10, and turn off the second switch circuit 30 when the voltage received at two ends of the voltage stabilization control circuit 10 is inconsistent with a polarity corresponding to the input end, that is, when the input end is reversely connected, and a clamp voltage exists inside the voltage stabilization control circuit 10; when the voltage received at the two ends of the voltage stabilizing control circuit 10 is consistent with the corresponding polarity of the input end, that is, the input end is connected positively; when the input terminal access voltage is smaller than the clamp voltage, the first switch circuit 20 is turned on, and when the input terminal access voltage is larger than the clamp voltage, the first switch circuit 20 is turned off.
The voltage stabilization control circuit 10 is suitable for the working state of reverse breakdown, the internal structure of the voltage stabilization control circuit 10 cannot be damaged by reverse breakdown, the clamping voltage of the voltage stabilization control circuit 10 can determine the maximum value of the accessible voltage of the positive and negative voltage protection circuit, the larger the clamping voltage is, the larger the maximum value of the accessible voltage of the input end can be, the clamping voltage of the voltage stabilization control circuit 10 can be preset, the size of the preset voltage value is determined by the internal structure of the voltage stabilization control circuit 10 and the specification of components, the range of the accessible voltage of the positive and negative voltage protection circuit can be changed by changing the preset voltage value, and therefore the application in different scenes can be met.
In the working principle of this embodiment, the first switch circuit 20 and the second switch circuit 30 are used to control the output of the positive and negative voltage protection circuit, the output of the input end voltage can be controlled by controlling the on and off of the first switch circuit 20 and the second switch circuit 30, the voltage stabilization control circuit 10 is used to receive the input end voltage of the positive and negative voltage protection circuit, the voltage stabilization control circuit 10 controls the on and off of the first switch circuit 20 and the second switch circuit 30 according to the magnitude and polarity of the connected voltage, i.e. the magnitude and polarity of the input end voltage of the positive and negative voltage protection circuit, the output of the positive and negative voltage protection circuit can be determined, when the input end of the positive and negative voltage protection circuit is reversely connected, the second switch circuit 30 is turned off, the positive and negative voltage protection circuit has no voltage output, when the input end of the positive and negative voltage protection circuit is positively connected, the second switch circuit 30 is turned on, the output of the positive and negative voltage protection circuit is determined by the first switch circuit 20, when the voltage at the input end of the positive and negative voltage protection circuit is higher than the clamping voltage, the first switch circuit 20 is switched off, no voltage is output by the positive and negative voltage protection circuit, when the voltage at the input end of the positive and negative voltage protection circuit is lower than the clamping voltage, the first switch circuit 20 is switched on, the positive and negative voltage protection circuit outputs the voltage, the clamping voltage can be preset, and the range of the forward access voltage of the input end of the positive and negative voltage protection circuit can be determined by setting the clamping voltage value.
When the positive and negative voltage protection circuit works, when the input end of the positive and negative voltage protection circuit is connected with a reverse voltage, the second switch circuit 30 is switched off, no voltage is output by the positive and negative voltage protection circuit, when the forward voltage connected with the input end of the positive and negative voltage protection circuit is higher than the clamping voltage of the voltage stabilization control circuit 10, the first switch circuit 20 is switched off, no voltage is output by the positive and negative voltage protection circuit, when the forward voltage connected with the input end of the positive and negative voltage protection circuit is lower than the clamping voltage of the voltage stabilization control circuit 10, the first switch circuit 20 and the second switch circuit 30 are switched on, and the positive and negative voltage protection circuit outputs voltage.
The utility model discloses a set up steady voltage control circuit 10, first switch circuit 20, second switch circuit 30, the positive, input negative pole, the positive and output negative pole of input, the positive of input respectively with steady voltage control circuit 10 reaches the input of first switch circuit 20 is connected, the controlled end of first switch circuit 20 with steady voltage control circuit 10 is connected, the output of first switch circuit 20 with the positive connection of output, the negative pole of input respectively with steady voltage control circuit 10 and the input of second switch circuit 30 is connected, the controlled end of second switch circuit 30 with steady voltage control circuit 10 is connected, the output of second switch circuit 30 with the output negative pole is connected; the input end positive pole and the input end negative pole are used for accessing voltage, when the accessed voltage is inconsistent with the corresponding polarity of the input end, namely the input end is accessed with the voltage reversely, the voltage stabilization control circuit 10 controls the second switch circuit 30 to be switched off, the positive and negative voltage protection circuit is not switched on, the output end has no voltage output, when the accessed voltage is consistent with the corresponding polarity of the input end, namely the input end is accessed with the voltage forwardly, the voltage stabilization control circuit 10 controls the second switch circuit 30 to be switched on, when the accessed voltage value is higher than the clamping voltage of the voltage stabilization control circuit 10, the voltage stabilization control circuit 10 controls the first switch circuit 20 to be switched off, the positive and negative voltage protection circuit is not switched on, the output end has no voltage output, when the input end is accessed with the voltage value being lower than the clamping voltage of the voltage stabilization control circuit 10, the first switch circuit 20 and the second switch circuit 30 are switched on, and the negative voltage protection circuit is switched on, the output end outputs voltage. Compared with a charging interface without protection voltage in the background art, the protection circuit is arranged, and the problem that the service life of the active pen is influenced by access of excessive voltage or reverse voltage in the charging process of the active pen is avoided.
Referring to fig. 1 and 2, in an embodiment, the voltage regulation control circuit 10 includes a first resistor R1, a second resistor R2, a third resistor R3, a first diode D1 and a first MOS transistor Q1, the positive electrode of the input terminal is respectively connected to the first end of the first resistor R1, the first end of the second resistor R2 and the source of the first MOS transistor Q1, the second end of the first resistor R1, the second end of the second resistor R2 and the gate of the first MOS transistor Q1 are interconnected to the cathode of the first diode D1, the anode of the first diode D1 and the first end of the third resistor R3 are grounded, and the second end of the third resistor R3 is connected to the drain of the first MOS transistor Q1.
In this embodiment, the clamping voltage of the regulator control circuit 10 is the sum of the clamping voltage of the first diode D1 and the threshold voltage of the first MOS transistor Q1, the first diode D1 is a zener diode, when the first diode D1 breaks down in the reverse direction, the internal structure of the diode is not damaged, the first diode D1 is used to control the second switch circuit 30, the reverse voltage is connected to the input end of the positive/negative voltage protection circuit, the first diode D1 is turned on, the second switch circuit 30 is turned off, the forward voltage is connected to the input end of the positive/negative voltage protection circuit, the first diode D1 is turned off, the second switch circuit 30 is turned on, the first MOS transistor Q1 is used to control the first switch circuit 20, when the voltage value connected in the forward direction of the input end is lower than the clamping voltage of the first diode D1, the first MOS transistor Q1 is not turned on, when the voltage value connected in the forward direction of the input end is lower than the clamping voltage of the regulator control circuit 10, meanwhile, when the voltage value of the input end forward direction is higher than the clamping voltage of the voltage stabilizing control circuit 10, the first MOS transistor Q1 is turned on, the first switch circuit 20 is turned on, and when the voltage value of the input end forward direction is higher than the clamping voltage of the first diode D1, the first MOS transistor Q1 is turned on, and the first switch circuit 20 is turned off.
Referring to fig. 1 and 2, in an embodiment, the first switch circuit 20 includes a second MOS transistor Q2, the second MOS transistor Q2 is a P-type MOS transistor, a source of the second MOS transistor Q2 is connected to the positive input terminal, a drain of the second MOS transistor Q2 is connected to the positive output terminal, and a gate of the second MOS transistor Q2 is connected to the drain of the first MOS transistor Q1.
In this embodiment, the gate of the second MOS transistor Q2 is the controlled terminal of the first switch circuit 20, when the gate of the second MOS transistor Q2 is connected to a high level, the first switch circuit 20 is turned on, and when the gate of the second MOS transistor Q2 is connected to a low level, the first switch circuit 20 is turned off.
Referring to fig. 1 and 2, in an embodiment, the second switch circuit 30 includes a third MOS transistor Q3, the third MOS transistor Q3 is an N-type MOS transistor, a drain of the third MOS transistor Q3 is connected to the negative terminal of the input terminal, a source of the third MOS transistor Q3 is connected to the negative terminal of the output terminal, and a gate of the third MOS transistor Q3 is connected to the cathode of the first diode D1.
In this embodiment, the gate of the third MOS transistor Q3 is the controlled terminal of the second switch circuit 30, when the gate of the second MOS transistor Q2 is connected to a high level, the second switch circuit 30 is turned on, and when the gate of the third MOS transistor Q3 is connected to a low level, the second switch circuit 30 is turned off.
Referring to fig. 2, in an embodiment, the positive-negative voltage protection circuit further includes a fourth MOS transistor Q4 and a fifth MOS transistor, the fourth MOS transistor Q4 is a P-type MOS transistor, the fifth MOS transistor is an N-type MOS transistor, a gate of the fourth MOS transistor Q4 is connected to a gate of the second MOS transistor Q2, a source of the fourth MOS transistor Q4 is connected to a drain of the second MOS transistor Q2, a drain of the fourth MOS transistor Q4 is connected to a source of the second MOS transistor Q2, a gate of the fifth MOS transistor Q3 is connected to a gate of the third MOS transistor Q3, a source of the fifth MOS transistor Q3 is connected to a drain of the third MOS transistor Q3, and a drain of the fifth MOS transistor Q3 is connected to a drain of the third MOS transistor Q3.
In the embodiment, the fourth MOS transistor Q4 is connected in parallel with the second MOS transistor Q2, and the fifth MOS transistor is connected in parallel with the third MOS transistor Q3, so as to reduce the impedance of the MOS transistors and reduce the power loss.
Referring to fig. 2, in an embodiment, the positive-negative voltage protection circuit further includes a second diode D2, an anode of the second diode D2 is connected to the negative terminal of the input terminal, and the second diode D2 is connected to the positive terminal of the input terminal.
In this embodiment, the second diode D2 is a bidirectional ESD diode, which is used for electrostatic protection of a circuit, and electrostatic discharge may damage sensitive semiconductors and integrated circuits, and the bidirectional ESD diode has symmetric positive and negative breakdown voltages, and can protect the circuit through positive and negative signals when the positive and negative voltage protection circuit is connected to a forward voltage and a reverse voltage.
Referring to fig. 2, in an embodiment, the positive and negative voltage protection circuit further includes a voltage stabilizing unit;
the voltage stabilizing unit comprises a first capacitor C1 and a fourth resistor R4, wherein a first end of the first capacitor C1 and a first end of the fourth resistor R4 are interconnected with the anode of the output end, and a second end of the first capacitor C1 and a second end of the fourth resistor R4 are grounded.
In this embodiment, the first capacitor C1 is a filter capacitor for filtering an alternating current portion of the output voltage of the positive-negative voltage protection circuit, the fourth resistor R4 is a discharge resistor, and the fourth resistor R4 is connected in parallel with the first capacitor C1, so that the first capacitor C1 is charged and discharged along with the power supply fluctuation, and the parallel connection of the fourth resistor R4 absorbs the charged and discharged energy, thereby enabling the circuit to operate stably.
The utility model provides an initiative pen.
This initiative pen includes as above positive and negative voltage protection circuit, and above-mentioned embodiment is referred to this positive and negative voltage protection circuit's concrete structure, because the utility model discloses initiative pen has adopted the whole technical scheme of above-mentioned all embodiments, consequently has all beneficial effects that the technical scheme of above-mentioned embodiment brought at least, and the repeated description is no longer given here.
The above is only the optional embodiment of the present invention, and not therefore the limit to the patent scope of the present invention, all the concepts of the present invention utilize the equivalent structure transformation of the content of the specification and the attached drawings, or the direct/indirect application in other related technical fields is included in the patent protection scope of the present invention.
Claims (8)
1. A positive and negative voltage protection circuit for a charging interface, comprising: the voltage stabilizing control circuit comprises a voltage stabilizing control circuit, a first switch circuit, a second switch circuit, an input end anode, an input end cathode, an output end anode and an output end cathode;
the input ends of the voltage stabilization control circuit and the first switch circuit are respectively connected with the positive electrode of the input end, the controlled end of the first switch circuit is connected with the voltage stabilization control circuit, the output end of the first switch circuit is connected with the positive electrode of the output end, the input ends of the voltage stabilization control circuit and the second switch circuit are respectively connected with the negative electrode of the input end, the controlled end of the second switch circuit is connected with the voltage stabilization control circuit, and the output end of the second switch circuit is connected with the negative electrode of the output end;
when the positive pole and the negative pole of the input end are connected with forward voltage, the voltage stabilizing control circuit controls the second switch circuit to be switched on, and when the input end of the positive and negative voltage protection circuit is connected with reverse voltage, the voltage stabilizing control circuit controls the second switch circuit to be switched off;
when the voltage value of the positive pole and the negative pole of the input end are connected in the positive direction and the negative pole of the input end are lower than the clamping voltage of the voltage stabilizing control circuit, the voltage stabilizing control circuit controls the first switch circuit to be switched on, and when the voltage value of the positive pole and the negative pole of the input end are connected in the positive direction and the negative pole of the positive voltage protection circuit are higher than the clamping voltage of the voltage stabilizing control circuit, the voltage stabilizing control circuit controls the first switch circuit to be switched off.
2. The positive-negative voltage protection circuit of claim 1, wherein the voltage regulation control circuit comprises a first resistor, a second resistor, a third resistor, a first diode and a first MOS transistor, the positive electrode of the input terminal is respectively connected to the first terminal of the first resistor, the first terminal of the second resistor and the source of the first MOS transistor, the second terminal of the first resistor, the second terminal of the second resistor and the gate of the first MOS transistor are interconnected to the cathode of the first diode, the anode of the first diode and the first terminal of the third resistor are grounded, and the second terminal of the third resistor is connected to the drain of the first MOS transistor.
3. The positive-negative voltage protection circuit as claimed in claim 2, wherein the first switch circuit includes a second MOS transistor, the second MOS transistor is a P-type MOS transistor, a source of the second MOS transistor is connected to the positive terminal of the input terminal, a drain of the second MOS transistor is connected to the positive terminal of the output terminal, and a gate of the second MOS transistor is connected to the drain of the first MOS transistor.
4. The positive-negative voltage protection circuit of claim 3, wherein the second switch circuit comprises a third MOS transistor, the third MOS transistor is an N-type MOS transistor, a drain of the third MOS transistor is connected to the cathode of the input terminal, a source of the third MOS transistor is connected to the cathode of the output terminal, and a gate of the third MOS transistor is connected to the cathode of the first diode.
5. The positive-negative voltage protection circuit according to claim 4, further comprising a fourth MOS transistor and a fifth MOS transistor, wherein the fourth MOS transistor is a P-type MOS transistor, the fifth MOS transistor is an N-type MOS transistor, a gate of the fourth MOS transistor is connected to a gate of the second MOS transistor, a source of the fourth MOS transistor is connected to a drain of the second MOS transistor, a drain of the fourth MOS transistor is connected to a source of the second MOS transistor, a gate of the fifth MOS transistor is connected to a gate of the third MOS transistor, a source of the fifth MOS transistor is connected to a drain of the third MOS transistor, and a drain of the fifth MOS transistor is connected to a source of the third MOS transistor.
6. The positive-negative voltage protection circuit of claim 5, further comprising a second diode, an anode of the second diode being connected to the negative terminal of the input terminal, the second diode being connected to the positive terminal of the input terminal.
7. The positive-negative voltage protection circuit according to claim 6, wherein the positive-negative voltage protection circuit further comprises a voltage stabilization unit;
the voltage stabilizing unit comprises a first capacitor and a fourth resistor, wherein the first end of the first capacitor and the first end of the fourth resistor are interconnected with the anode of the output end, and the second end of the first capacitor and the second end of the fourth resistor are grounded.
8. Active pen, characterized in that it comprises a positive and negative voltage protection circuit according to any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220176579.7U CN217215947U (en) | 2022-01-24 | 2022-01-24 | Positive and negative voltage protection circuit and active pen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220176579.7U CN217215947U (en) | 2022-01-24 | 2022-01-24 | Positive and negative voltage protection circuit and active pen |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217215947U true CN217215947U (en) | 2022-08-16 |
Family
ID=82794833
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220176579.7U Active CN217215947U (en) | 2022-01-24 | 2022-01-24 | Positive and negative voltage protection circuit and active pen |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217215947U (en) |
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2022
- 2022-01-24 CN CN202220176579.7U patent/CN217215947U/en active Active
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