CN211630073U

CN211630073U - Online voltage numerical control circuit

Info

Publication number: CN211630073U
Application number: CN202020446026.XU
Authority: CN
Inventors: 唐裕海; 肖创易
Original assignee: Shenzhen Laserfleet Space Technology Co ltd
Current assignee: Shenzhen Laserfleet Space Technology Co ltd
Priority date: 2020-03-31
Filing date: 2020-03-31
Publication date: 2020-10-02
Anticipated expiration: 2030-03-31

Abstract

The utility model provides an online voltage numerical control circuit, which comprises an output unit, a voltage supply unit and a numerical control unit; the output unit adopts a low-voltage-drop linear voltage stabilizer U2 and a peripheral circuit, the voltage supply unit comprises a voltage-stabilizing output power supply for outputting set voltage, the numerical control unit is served by an intelligent device U1, an I/O port of the intelligent device U1 is respectively connected with a set voltage-dropping end of the low-voltage-drop linear voltage stabilizer U2, the set voltage output by the voltage-stabilizing output power supply is connected with an input end V2 of the low-voltage-drop linear voltage stabilizer U2_ｉｎSaid low step-down linearityThe output end of the voltage regulator U2 outputs the required voltage according to the assignment value of the I/O port of the numerical control unit. The utility model discloses in, the output of low dropout linear voltage regulator U2 satisfies the requirement of laser instrument to input voltage according to the multiple voltage of assignment output of the IO port of numerical control unit.

Description

Online voltage numerical control circuit

Technical Field

The utility model relates to an online voltage numerical control circuit.

Background

Laser communication is a communication method for transmitting information using laser light. The laser is a novel light source and has the characteristics of high brightness, strong directivity, good monochromaticity, strong coherence, strong anti-electromagnetic interference capability, large communication capacity, high safety, no need of laying communication optical cables and the like.

In laser communication, the laser optical power regulating circuit regulates the intensity of emitted light output by the laser in a mode of controlling the input power supply voltage of the laser so as to achieve the purpose of controlling the output optical power of the laser.

At present, a circuit for controlling an output voltage generally adopts a voltage numerical control circuit, and chinese patent publication No. CN 207265868U discloses an output voltage control circuit, which is a dual-voltage numerical control voltage-stabilized power supply circuit, and includes: the output unit, supply and press the unit and numerical control unit; the output unit is used for outputting a first voltage value and a second voltage value; the voltage supply unit is used for providing a voltage source required by the output unit to output the second voltage value; the numerical control unit is used for enabling the output unit to output the first voltage value or the second voltage value through the output of the numerical control signal. The double-voltage numerical control voltage-stabilized power supply circuit has two voltages which can not meet the requirement of a laser on input voltage.

Disclosure of Invention

The utility model discloses can not satisfy the not enough of laser instrument to input voltage's requirement to present voltage numerical control circuit output voltage number, provide an online voltage numerical control circuit.

The utility model discloses realize that its technical purpose technical scheme is: an online voltage numerical control circuit comprises an output unit, a voltage supply unit and a numerical control unit; the output unit adopts a low-voltage-drop linear voltage stabilizer U2 and a peripheral circuit, the voltage supply unit comprises a voltage-stabilizing output power supply for outputting set voltage, the numerical control unit is served by an intelligent device U1, an I/O port of the intelligent device U1 is respectively connected with a set voltage-dropping end of the low-voltage-drop linear voltage stabilizer U2, the set voltage output by the voltage-stabilizing output power supply is connected with an input end V2 of the low-voltage-drop linear voltage stabilizer U2_ｉｎThe output end of the low-voltage-drop linear voltage regulator U2 is assigned according to the I/O port of the numerical control unitAnd outputting the required voltage.

The utility model discloses in, the output of low dropout linear voltage regulator U2 satisfies the requirement of laser instrument to input voltage according to the multiple voltage of assignment output of the IO port of numerical control unit.

Further, in the above-mentioned online voltage numerical control circuit: the low-voltage-drop linear voltage stabilizer U2 adopts a TPS7A8300 device manufactured by TI company, and a peripheral circuit of the TPS7A8300 device comprises a resistor R1, a resistor R2, a capacitor C1 and a capacitor C2; an SNS pin of a device with the model number of TPS7A8300 is connected with an Out pin, a PG pin is connected with the Out pin through a resistor R1, an FB pin is respectively connected with the Out pin and the ground through a capacitor C1 and a resistor R2, and an NR/SS pin is grounded through a capacitor C2.

Further, in the above-mentioned online voltage numerical control circuit: the voltage-stabilizing output power supply outputs 6.5V to V of a device with the model of TPS7A8300_inAnd (7) a pin.

Further, in the above-mentioned online voltage numerical control circuit: the intelligent device U1 is a control type device for generating I/O signals and comprises an FPGA or an MCU.

The present invention will be described in more detail with reference to the accompanying drawings and examples.

Drawings

Fig. 1 is a schematic diagram of an online voltage digital control circuit according to embodiment 1 of the present invention.

Fig. 2 is the utility model discloses embodiment 2 online voltage numerical control circuit schematic diagram.

Detailed Description

The embodiment is a line voltage numerical control circuit, which is applied to a laser optical power regulating circuit in laser communication. The method adopts a mode of controlling the input power supply voltage of the laser to adjust the intensity of the emitted light output by the laser so as to achieve the purpose of controlling the output light power of the laser.

As shown in fig. 1: the output unit of the embodiment adopts a low-voltage drop linear voltage regulator U2 and a peripheral circuit, the voltage supply unit comprises a voltage-stabilizing output power supply for outputting set voltage, the numerical control unit is served by an intelligent device U1, and an I/O port of the intelligent device U1 is divided intoIs connected with the set voltage reduction end of the low voltage reduction linear voltage regulator U2, and the set voltage output by the voltage stabilization output power supply is connected with the input end V of the low voltage reduction linear voltage regulator U2_ｉｎAnd the output end of the low-voltage-drop linear voltage regulator U2 outputs the required voltage according to the assignment of the I/O port of the numerical control unit.

In this embodiment, the low dropout linear regulator U2 adopts a device of model number TPS7a8300 manufactured by TI company, and a peripheral circuit of the device of model number TPS7a8300 includes a resistor R1, a resistor R2, a capacitor C1, and a capacitor C2; an SNS pin of a device with the model number of TPS7A8300 is connected with an Out pin, a PG pin is connected with the Out pin through a resistor R1, an FB pin is respectively connected with the Out pin and the ground through a capacitor C1 and a resistor R2, and an NR/SS pin is grounded through a capacitor C2.

As shown in fig. 1: in the figure, U1 can be a control type device such as an FPGA or an MCU, and the output end of a control interface is connected with a corresponding I/O port; the I/O port control types include, but are not limited to, high, low, floating, etc.

When the I/O port is thrown high, the output voltage is 1.8V, Vout and less than or equal to 5V.

The output voltage Vout = GND when the I/O port is thrown low.

When the I/O port is empty, the online resistance value is infinite.

U2 in FIG. 1 is a TPS7A8300 device manufactured by Texas Instruments.

As shown in fig. 1, when the Vin pin terminal of U2 inputs 6.5V power, U2 enters a standby state. Namely: when the U1 digital control I/O-0 port outputs Vout = GND or floating, the U2 turns off the voltage output to enter a standby state.

When the U1 numerical control I/O-0 port outputs a voltage of 1.8V, Vout and 5.5V, the U2 enters a working state and fixedly outputs a voltage of 2.2V; the output voltage value thereof changes according to the resistance value change of R2; the output voltage value calculation formula at this time is as follows: vout =0.8 × (1+ 12100/R2); if more real-time change voltage values need to be obtained through online control, the output value of the numerical control I/O port of the U1 can be adjusted according to the requirement to adjust the output voltage value of the U2, and at the moment, the U2 output voltage value calculation formula is as follows: vout =0.8 × (1+12100/R2) + U1 numerical control I/O port variation corresponding value. The U1 numerical control I/O port is shown in Table 1 corresponding to the increased value of the U2 voltage output.

TABLE 1 summary of U2 voltage increases for U1 NC I/O ports

The U1 numerical control I/O port variation corresponds to the U2 voltage output value as shown in Table 2:

from table 2, the output voltage range of U2 is: 2.2-5.2V, and taking 0.05V as the minimum unit of the minimum added value to obtain different online real-time voltage values.

The output value of the U1 numerical control I/O port is changed or combined in different ways, so that the output voltage value of the U2 is changed, and the purpose of controlling the output light power of the laser is achieved.

In the circuit of embodiment 2, if a lower initial voltage value is required, when the output of the U2 initial value is started from the lowest initial value of the U2 chip, the U1 digital control I/O port changes and the corresponding U2 voltage output value is shown in table 3: the superposition (the lowest initial value of the chip U2 in the present circuit, factory set, is 0.8V) is shown in FIG. 2.

TABLE 3

Table 3 a table two of the U2 voltage output values corresponding to the U1 numerical control I/O port variation is available according to table 3, and the U2 output voltage value range is: 0.8-3.95V, and the lowest added value takes 0.05V as the minimum unit to obtain different online real-time voltage values, and in circuits with different requirements, the output values of the U1 numerical control I/O port are changed or combined in different ways, so that the purpose of outputting the voltage at will is achieved.

Claims

1. An online voltage numerical control circuit comprises an output unit, a voltage supply unit and a numerical control unit; the method is characterized in that: the output unit adopts a low-voltage-drop linear voltage stabilizer U2 and a peripheral circuit, the voltage supply unit comprises a voltage-stabilized output power supply for outputting set voltageThe numerical control unit is served by an intelligent device U1, an I/O port of the intelligent device U1 is respectively connected with a set step-down end of a low step-down linear voltage regulator U2, and the set voltage output by the voltage-stabilizing output power supply is connected with an input end V2 of the low step-down linear voltage regulator U2_ｉｎAnd the output end of the low-voltage-drop linear voltage regulator U2 outputs the required voltage according to the assignment of the I/O port of the numerical control unit.

2. The on-line voltage numerical control circuit of claim 1, characterized in that: the low-voltage-drop linear voltage stabilizer U2 adopts a TPS7A8300 device manufactured by TI company, and a peripheral circuit of the TPS7A8300 device comprises a resistor R1, a resistor R2, a capacitor C1 and a capacitor C2; an SNS pin of a device with the model number of TPS7A8300 is connected with an Out pin, a PG pin is connected with the Out pin through a resistor R1, an FB pin is respectively connected with the Out pin and the ground through a capacitor C1 and a resistor R2, and an NR/SS pin is grounded through a capacitor C2.

3. The on-line voltage numerical control circuit of claim 2, wherein: the voltage-stabilizing output power supply outputs 6.5V to V of a device with the model of TPS7A8300_inAnd (7) a pin.

4. The on-line voltage numerical control circuit of claim 1, 2 or 3, characterized in that: the intelligent device U1 is a control type device for generating I/O signals and comprises an FPGA or an MCU.