CN217789657U

CN217789657U - Level conversion circuit for cradle head

Info

Publication number: CN217789657U
Application number: CN202221696712.8U
Authority: CN
Inventors: 郭宗奎; 杨恩飞; 刘继东; 高兆华
Original assignee: Shandong Feiyue Electronics Technology Co ltd
Current assignee: Shandong Feiyue Electronics Technology Co ltd
Priority date: 2022-07-04
Filing date: 2022-07-04
Publication date: 2022-11-11
Anticipated expiration: 2032-07-04

Abstract

The utility model provides a level shift circuit for cloud platform, when LDO power chip input is IN pin input high level, LDO power chip output high level, the triode switches on, triode collecting electrode output low level, the grid voltage of PMOS pipe also is the low level this moment, because the source electrode of PMOS pipe is the high level, grid voltage according to the PMOS pipe is less than the condition that switches on of source voltage, consequently, the PMOS pipe switches on, the level of PMOS pipe output end drain electrode output is another high level, microcontroller work this moment, therefore the LED lamp lights. The input of the IN pin of the input end of the LDO power supply chip is enabled to input a high level voltage, and the output of the last stage of circuit outputs another high level voltage, so that the level conversion function is realized. The LED lamp plays a role in indicating.

Description

Level conversion circuit for cradle head

Technical Field

The utility model relates to a cloud platform technical field, concretely relates to level conversion circuit for cloud platform.

Background

For the pan/tilt head, the more functions the pan/tilt head implements, the more chips the circuit board of the pan/tilt head needs, for example, the serial control chip ADM2587E needs to be added to implement serial control, and the L293DD needs to be added to implement zoom focusing of the lens, and so on. The power supply voltage of these chips is not a single voltage, and is 5V, 3.3V, 12V, or the like. The chips are connected together, so that the voltage difference between every two chips is caused, and the problem of level mismatch is caused, so that the normal operation of each chip is influenced.

Disclosure of Invention

The utility model discloses an overcome not enough of above technique, provide a level conversion circuit for cloud platform that can realize the level conversion of two kinds of differences.

The utility model overcomes the technical scheme that its technical problem adopted is:

a level shift circuit for a pan/tilt head, comprising:

an IN pin of the LDO power supply chip is connected to a power supply VCC _1, and a GND pin of the LDO power supply chip is grounded;

the base electrode of the triode is connected to the OUT pin of the LDO power supply chip through a magnetic bead, the collector electrode of the triode is connected to a power supply VCC _2 through a resistor III, and the emitter electrode of the triode is grounded;

a grid electrode of the PMOS tube is connected with a collector electrode of the triode, a source electrode of the PMOS tube is connected with a power supply VCC _2, a drain electrode of the PMOS tube is respectively connected with a VDD pin of the microcontroller, one end of a capacitor V and the anode of the LED lamp, and the other end of the capacitor V is grounded;

the negative pole of LED lamp is connected in microcontroller's PB0 pin, and microcontroller's VSS pin ground connection.

Preferably, the LDO power supply chip is an LT1117-3.3 type forward voltage stabilizing chip.

Preferably, the microcontroller is a GD32F303VET6 type microcontroller.

And furthermore, the LDO power supply further comprises a capacitor I and a capacitor III which are connected IN parallel, one end of the capacitor I and one end of the capacitor III which are connected IN parallel are connected to an IN pin of the LDO power supply chip, and the other end of the capacitor I and the other end of the capacitor III are grounded.

And one end of the capacitor II and one end of the capacitor IV which are connected in parallel are connected to an OUT pin of the LDO power supply chip, and the other end of the capacitor II and the other end of the capacitor IV which are connected in parallel are grounded.

Furthermore, the LDO power supply further comprises a resistor I and a resistor II, the base of the triode is connected to one end of the resistor I, the other end of the resistor I is connected to the OUT pin of the LDO power supply chip through a magnetic bead, one end of the resistor II is connected to the base of the triode, and the other end of the resistor II is grounded.

The utility model has the advantages that: when the input end of the LDO power supply chip is IN a high level, namely the IN pin inputs the high level, the output end of the LDO power supply chip outputs the high level, the triode is conducted, the collector of the triode outputs the low level, the grid voltage of the PMOS pipe is also the low level, the source electrode of the PMOS pipe is the high level, the grid voltage of the PMOS pipe is smaller than the conduction condition of the source voltage, the PMOS pipe is conducted, the level output by the drain electrode of the output end of the PMOS pipe is another high level, the microcontroller works at the moment, and the LED lamp is lightened. The input of the IN pin of the input end of the LDO power supply chip is realized, and the output of the last stage circuit outputs another high level voltage to play a role of level conversion. The LED lamp plays a role in indicating.

Drawings

FIG. 1 is a circuit diagram of the present invention;

in the figure, 1.LDO power supply chip 2, capacitor I3, capacitor II 4, capacitor III 5, capacitor IV 6, magnetic bead 7, resistor I8, resistor II 9, triode 10, resistor III 11, PMOS tube 12, capacitor V13, LED lamp 14 and microcontroller.

Detailed Description

The present invention will be further explained with reference to fig. 1.

A level shift circuit for a pan/tilt head, comprising: an IN pin of the LDO power supply chip 1 is connected to a power supply VCC _1, and a GND pin of the LDO power supply chip is grounded; a triode 9, the base of which is connected with the OUT pin of the LDO power supply chip 1 through a magnetic bead 6, the collector of which is connected with a power supply VCC _2 through a resistor III 10, and the emitter of which is grounded; a PMOS tube 11, the grid of which is connected to the collector of the triode, the source of which is connected to a power supply VCC _2, the drain of which is connected to the VDD pin of the microcontroller 14, one end of a capacitor V12 and the anode of the LED lamp 13, respectively, and the other end of the capacitor V12 is grounded; the cathode of the LED lamp 13 is connected to the PB0 pin of the microcontroller 14, and the VSS pin of the microcontroller 14 is grounded. When an external power supply system provides a high VCC _1 level to an input end of the LDO power supply chip 1, namely an IN pin, the voltage at the input end of the LDO power supply chip 1 is a high VCC _1 level, the LDO power supply chip 1 works, a high level voltage (for example, 3.3V) is output from an output end of the LDO power supply chip 1, a collector of the triode 9 is connected to the high VCC _2, the triode 9 is conducted, the collector of the triode 9 outputs a low level voltage (0V), and a gate voltage of the PMOS tube 11 is also a low level at the time. The conversion that the input end IN pin of the LDO power supply chip 1 inputs a high level of VCC _1 and the drain electrode of the output end of the PMOS tube outputs another high level of VCC _2 is realized. The LED lamp 13 plays a role IN indicating, the external power supply system is powered off due to human or other reasons, the original high level VCC _1 disappears, at this time, the input end (IN) of the LDO power supply chip 1 has no voltage input, which can be regarded as 0V, namely, the low level, the LDO power supply chip 1 does not work, the output end of the LDO power supply chip 1 has no voltage output, which can be regarded as the low level, the triode 9 is turned off, the collector of the triode 9 outputs the high level, at this time, the grid voltage of the PMOS tube 11 is also the high level, because the source electrode of the PMOS tube 11 is the high level, the PMOS tube 11 is turned off according to the condition that the grid voltage and the source voltage of the PMOS tube 11 are equal, therefore, the PMOS tube 11 is turned off, the level output by the drain electrode of the PMOS tube 11 is the low level, at this time, the microcontroller 14 cannot work, and therefore, the LED lamp 13 is turned off.

The transistor 9 is an NPN transistor, which functions as a switch. The magnetic beads 6 are used for filtering high-frequency interference in a line, and preventing high-frequency interference signals in voltage output by a front-stage circuit from being input into a rear-stage circuit to cause misoperation of the rear-stage circuit.

The capacitor V12 is a filter capacitor, the resistor III 10 is a pull-up resistor, and when the triode 9 is cut off, the output voltage of the triode 9 is pulled up to the power supply VCC.

Preferably, the LDO power supply chip 1 is an LT1117-3.3 type forward regulator chip. The microcontroller 14 is a GD32F303VET6 type microcontroller. Because the LT1117 series forward voltage stabilizing chip has two versions of adjustable output voltage and fixed output voltage, the version of the fixed output voltage used by the circuit uses less electronic components, the peripheral circuit is simple, and the cost is saved.

Furthermore, the LDO power supply further comprises a capacitor I2 and a capacitor III 4 which are connected IN parallel, one end of the capacitor I2 and one end of the capacitor III 4 which are connected IN parallel are connected to the IN pin of the LDO power supply chip 1, and the other end of the capacitor I2 and the other end of the capacitor III 4 which are connected IN parallel are grounded. The capacitor I2 and the capacitor III 4 are bypass capacitors and are also filter capacitors, so that ripple interference signals in the voltage input to the LDO power supply chip 1 are filtered.

Furthermore, the LDO power supply further comprises a capacitor II 3 and a capacitor IV 5 which are connected in parallel, one end of the capacitor II 3 and one end of the capacitor IV 5 which are connected in parallel are connected to an OUT pin of the LDO power supply chip 1, and the other end of the capacitor II 3 and the other end of the capacitor IV 5 which are connected in parallel are grounded. And the capacitor II 3 and the capacitor IV 5 are decoupling capacitors, namely ripple interference signals in the voltage output by the LDO power supply chip 1 are filtered.

Further, still include resistance I7 and resistance II 8, triode 9's base is connected in resistance I7's one end, and resistance I7's the other end connects in the OUT pin of LDO power chip 1 through magnetic bead 6, and resistance II 8's one end is connected in triode 9's base, and its other end ground connection. The resistor I7 is a current-limiting resistor, and the power consumption of the triode 9 is reduced. The resistor II 8 is a pull-down resistor, so that misoperation caused by noise can be prevented, the triode 9 is effectively grounded, and the triode 9 is cut off more reliably.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made without departing from the spirit and principle of the present invention shall fall within the protection scope of the present invention.

Claims

1. A level shift circuit for a pan/tilt head, comprising:

the pin of IN of the LDO power supply chip (1) is connected to a power supply VCC _1, and the pin of GND is grounded;

a triode (9), wherein the base electrode of the triode is connected with an OUT pin of the LDO power supply chip (1) through a magnetic bead (6), the collector electrode of the triode is connected with a power supply VCC _2 through a resistor III (10), and the emitter electrode of the triode is grounded;

the grid electrode of the PMOS tube (11) is connected to the collector electrode of the triode, the source electrode of the PMOS tube is connected to a power supply VCC-2, the drain electrode of the PMOS tube is respectively connected to a VDD pin of the microcontroller (14), one end of the capacitor V (12) and the anode of the LED lamp (13), and the other end of the capacitor V (12) is grounded;

the cathode of the LED lamp (13) is connected to a PB0 pin of the microcontroller (14), and a VSS pin of the microcontroller (14) is grounded.

2. The level shift circuit for a pan/tilt head according to claim 1, wherein: the LDO power supply chip (1) is an LT1117-3.3 type forward voltage stabilization chip.

3. The level shift circuit for a pan/tilt head of claim 1, wherein: the microcontroller (14) is a GD32F303VET6 type microcontroller.

4. The level shift circuit for a pan/tilt head of claim 1, wherein: the LDO power supply circuit also comprises a capacitor I (2) and a capacitor III (4) which are connected IN parallel, one end of the capacitor I (2) and one end of the capacitor III (4) which are connected IN parallel are connected to the IN pin of the LDO power supply chip (1), and the other end of the capacitor I (2) and the other end of the capacitor III (4) are grounded.

5. The level shift circuit for a pan/tilt head according to claim 1, wherein: the LDO power supply circuit also comprises a capacitor II (3) and a capacitor IV (5) which are connected in parallel, one end of the capacitor II (3) and one end of the capacitor IV (5) which are connected in parallel are connected to the OUT pin of the LDO power supply chip (1), and the other end of the capacitor II (3) and the other end of the capacitor IV (5) are grounded.

6. The level shift circuit for a pan/tilt head according to claim 1, wherein: still include resistance I (7) and resistance II (8), the base of triode (9) is connected in the one end of resistance I (7), and the other end of resistance I (7) connects in the OUT pin of LDO power chip (1) through magnetic bead (6), and the one end of resistance II (8) is connected in the base of triode (9), and its other end ground connection.