CN114527472A - Laser ranging controller and laser ranging equipment - Google Patents

Abstract

The invention discloses a laser ranging controller and laser ranging equipment, wherein the laser ranging controller comprises a driving module and a control module used for sending a pulse control signal to the driving module; the driving module includes: a clock signal generating circuit for outputting a clock signal; a charge pump circuit for charging with the clock signal to raise the low level voltage to a high level voltage required by a laser transmitter; a pulse signal generating circuit for outputting a pulse signal corresponding to a pulse width according to the pulse control signal; the driving circuit is used for forming a driving voltage of the laser emitter according to the pulse signal, and the output end of the driving circuit is connected with the cathode of the laser emitter; and the electrostatic discharge circuit is used for forming an electrostatic discharge loop. The invention can integrate the driving function and the power supply function of the laser transmitter into the laser ranging controller in a reliable mode and reduce the hardware cost of laser ranging.

Description

Laser ranging controller and laser ranging equipment

technical field

The invention relates to the technical field of laser ranging, in particular to a laser ranging controller and a laser ranging device.

Background technique

In recent years, Direct Time of Flight (dTOF) technology has been more and more widely used in the fields of unmanned driving, lidar and machine vision, and is considered to be one of the most accurate, reliable and effective ranging methods in the future. one. The principle of dTOF technology is: the laser pulse is sent from the laser transmitter, reflected by the object and then reaches the laser receiver, and the flight time of the laser pulse round trip is recorded and used for accurate ranging.

At present, the commonly used laser ranging controller in dTOF technology generally includes a control module for sending a pulse control signal to the driving module of the laser transmitter. The laser transmitter outputs a driving signal, and the laser transmitter supplies power by means of high voltage externally, and performs laser emission work according to the driving signal. The inventors have found through research that: because the existing laser ranging controller cannot integrate the driving module of the laser transmitter and the power supply module of the laser transmitter, it is necessary to separately manufacture the laser ranging controller and the driver of the laser transmitter. module and power supply module, so the hardware cost of laser ranging is relatively high. Therefore, there is an urgent need for a technology that can integrate the driving function and power supply function of the laser transmitter into the laser ranging controller in a reliable manner, so as to reduce the hardware cost of the laser ranging.

SUMMARY OF THE INVENTION

In view of the above problems, the purpose of the present invention is to provide a laser ranging controller and a laser ranging device, which can integrate the driving function and power supply function of the laser transmitter into the laser ranging controller in a reliable manner, and reduce the laser The hardware cost of ranging.

In order to achieve the above object, an embodiment of the present invention provides a laser ranging controller, which includes a drive module and a control module for sending a pulse control signal to the drive module; the drive module includes:

a clock signal generating circuit, which is used for outputting a clock signal under the enabling control of the control module;

a charge pump circuit, whose input terminal is connected to a low-level voltage, and its control terminal is connected to the output terminal of the clock signal generating circuit, which is used to charge the low-level voltage with the clock signal Raised to the high level voltage required by the laser transmitter, the output of which is used to connect with the anode of the laser transmitter;

a pulse signal generating circuit, the input terminal of which is connected to the pulse control signal output terminal of the control module, and is used for outputting a pulse signal corresponding to the pulse width according to the pulse control signal;

a driving circuit, the input terminal of which is connected to the output terminal of the pulse signal generating circuit, which is used for forming the driving voltage of the laser transmitter according to the pulse signal, and the output terminal is used for connecting with the cathode of the laser transmitter ;and,

The electrostatic discharge circuit is connected between the output end of the charge pump circuit, the output end of the driving circuit and the ground, and is used to form an electrostatic discharge circuit.

As an improvement of the above solution, the clock signal generation circuit includes a ring oscillator and a first level shift circuit;

The ring oscillator is used for outputting a clock signal of a first voltage under the enabling control of the control module;

The input end of the first level shift circuit is connected with the output end of the ring oscillator, the output end of the first level shift circuit is connected with the input end of the charge pump circuit, and the first level shift circuit is connected with the input end of the charge pump circuit. A bit circuit is used to level shift the clock signal to a second voltage.

As an improvement of the above scheme, the pulse signal generating circuit includes a pulse signal generator and a second level shift circuit;

The input end of the pulse signal generator is connected with the pulse control signal output end of the control module, which is used for outputting the pulse signal corresponding to the pulse width and the first voltage according to the pulse control signal;

The input end of the second level shift circuit is connected to the output end of the pulse signal generator, the output end of the second level shift circuit is connected to the input end of the drive circuit, and the second level shift circuit A bit circuit is used to level shift the pulse signal to a second voltage.

As an improvement of the above solution, the power supply voltage of both the clock signal generating circuit and the pulse signal generating circuit is smaller than the power supply voltage of the driving circuit; the power supply voltage of the driving circuit is smaller than the output voltage of the charge pump circuit .

As an improvement of the above scheme, the drive circuit includes a pre-drive circuit and a switch circuit;

the input end of the pre-driving circuit is connected to the output end of the pulse signal generating circuit, and the output end is connected to the input end of the switch circuit, which is used for pre-driving the switch circuit according to the pulse signal;

The output end of the switch circuit is used for connecting with the cathode of the laser transmitter.

As an improvement to the above solution, the switch circuit includes a first switch tube; the input end of the first switch tube is connected to the output end of the pre-drive circuit, the ground end of the first switch tube is grounded, and the first switch tube is grounded. The output end of a switch tube is used for connecting with the cathode of the laser transmitter.

As an improvement of the above solution, the first switch transistor is a high-voltage NMOS transistor.

As an improvement of the above solution, the electrostatic discharge circuit includes a power clamp circuit, a first electrostatic protection diode circuit and a second electrostatic protection diode circuit;

One end of the power clamp circuit is connected to the output end of the charge pump circuit, and the other end of the power clamp circuit is grounded;

The cathode of the first electrostatic protection diode circuit is connected to the output end of the charge pump circuit, and the anode of the first electrostatic protection diode circuit is connected to the output end of the drive circuit;

The cathode of the second electrostatic protection diode circuit is connected to the output end of the drive circuit, and the anode of the second electrostatic protection diode circuit is grounded.

As an improvement of the above solution, the power clamp circuit includes a first thick gate oxide NMOS tube, a second thick gate oxide NMOS tube, a third thick gate oxide NMOS tube, a first thick gate oxide PMOS tube and a resistor;

One end of the resistor is connected to the output end of the charge pump circuit, the other end of the resistor is connected to the gate of the first thick gate oxide NMOS transistor, and the source of the first thick gate oxide NMOS transistor and The drain is grounded; the source of the first thick gate oxide PMOS transistor is connected to the output end of the charge pump circuit, and the gate of the first thick gate oxide PMOS transistor is connected to both the resistor and the capacitor between, the drain of the first thick gate oxide PMOS transistor is connected to the drain of the second thick gate oxide NMOS transistor, and the gate of the second thick gate oxide NMOS transistor is connected to the resistor and the Between the gates of the first thick gate oxide NMOS transistor, the source of the second thick gate oxide NMOS transistor is grounded; the drain of the third thick gate oxide NMOS transistor and the output end of the charge pump circuit connection, the gate of the third thick gate oxide NMOS transistor is connected between the drain of the first thick gate oxide PMOS transistor and the drain of the second thick gate oxide NMOS transistor, the third thick gate oxide NMOS transistor The source of the thick gate oxide NMOS transistor is grounded.

Another embodiment of the present invention provides a laser ranging device, which includes the laser ranging controller described in any of the above solutions.

Compared with the prior art, the laser ranging controller and the laser ranging device provided by the embodiments of the present invention have at least one of the following advantages:

By integrating a clock signal generating circuit and a charge pump circuit in the laser ranging controller, the charge pump circuit can use the clock signal to generate an electrical output clock signal for charging, so as to boost the low-level voltage to the laser The high-level voltage required by the transmitter can realize the integration of the power supply function in the laser ranging controller; by integrating the pulse signal generating circuit and the driving circuit in the laser ranging controller, the driving circuit can utilize The pulse control signal generated by the pulse signal generating circuit forms the driving voltage of the laser transmitter, so as to realize the integration of the driving function in the laser ranging controller; in addition, when the laser ranging controller is integrated with the above-mentioned In order to avoid the influence of static electricity generated between the circuits of the integrated laser ranging controller on the entire circuit, an electrostatic discharge circuit is integrated in the laser ranging controller, so that the The electrostatic discharge circuit forms an electrostatic discharge circuit between the charge pump circuit, the drive circuit and the ground, ensuring that the entire laser ranging controller circuit is more reliable. It can be seen from the above analysis that the embodiment of the present invention can integrate the driving function and power supply function of the laser transmitter into the laser ranging controller in a reliable manner, so that there is no need to configure a separate chip including the driving module of the laser transmitter and the power supply module. , reducing the hardware cost of laser ranging.

Description of drawings

In order to illustrate the technical solutions of the present invention more clearly, the following will briefly introduce the accompanying drawings used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention, which are common in the art. As far as technical personnel are concerned, other drawings can also be obtained based on these drawings without any creative effort.

1 is a schematic diagram of a circuit structure of a laser ranging controller according to an embodiment of the present invention;

2 is a schematic diagram of a circuit structure of a ring oscillator provided by an embodiment of the present invention;

3 is a schematic diagram of a circuit structure of a level shift circuit provided by an embodiment of the present invention;

4 is a schematic diagram of a circuit structure of a pulse signal generator provided by an embodiment of the present invention;

5 is a schematic diagram of a circuit structure of an adjustable delay module provided by an embodiment of the present invention;

FIG. 6 is a schematic diagram of a circuit structure of an electrostatic discharge circuit provided by an embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Wherein, the terms first, second, etc. in the description and the claims are only used for the description purpose of distinguishing the same technical features, and should not be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features, Nor is an order or chronological order necessarily described. Terms are interchangeable under appropriate circumstances. Thus, a feature delimited with "first", "second" may expressly or implicitly include at least one of that feature.

Furthermore, reference herein to an "embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor a separate or alternative embodiment that is mutually exclusive of other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

Referring to FIG. 1, an embodiment of the present invention provides a laser ranging controller 100, which includes a driving module 2 and a control module 1 for sending a pulse control signal to the driving module 2; the driving module 2 includes: A clock signal generating circuit 20 , a charge pump circuit 21 , a pulse signal generating circuit 22 , a driving circuit 23 and an electrostatic discharge circuit 24 . The clock signal generating circuit 20 is used for outputting a clock signal under the enable control of the control module 1; the input end of the charge pump circuit 21 is used to connect with a low level voltage, and the control end thereof is connected to the charge pump circuit 21. The output terminal of the clock signal generating circuit 20 is connected to the clock signal for charging to raise the low-level voltage to the high-level voltage required by the laser transmitter 3, and its output terminal is used to connect with the The anode of the laser transmitter 3 is connected. Wherein, by integrating the clock signal generating circuit 20 and the charge pump circuit 21 in the laser ranging controller 100, the charge pump circuit 21 can use the clock signal to generate an electrical output clock signal for charging, so as to charge the low The level voltage is raised to the high level voltage required by the laser transmitter 3 , so that the power supply function is integrated in the laser ranging controller 100 . In addition, the input end of the pulse signal generating circuit 22 is connected to the pulse control signal output end of the control module 1, which is used for outputting a pulse signal corresponding to the pulse width according to the pulse control signal; the drive circuit 23, Its input end is connected with the output end of the pulse signal generating circuit 22 , which is used to form the driving voltage of the laser transmitter 3 according to the pulse signal, and its output end is used for connecting with the cathode of the laser transmitter 3 ; By integrating the pulse signal generating circuit 22 and the driving circuit 23 in the laser ranging controller 100, the driving circuit 23 can utilize the pulse control signal generated by the pulse signal generating circuit 22 to form the laser transmitter 3 Therefore, the driving function is integrated in the laser ranging controller 100 . When the above-mentioned circuit is integrated into the laser ranging controller 100 to realize the integrated driving function and power supply function, in order to avoid the influence of static electricity generated between the circuits of the integrated laser ranging controller 100 on the entire circuit, the The laser ranging controller 100 integrates the electrostatic discharge circuit 24, and the electrostatic discharge circuit 24 is connected to the output terminal of the charge pump circuit 21, the output terminal of the driving circuit 23 and the ground. During this time, the electrostatic discharge circuit 24 is used to form an electrostatic discharge circuit between the charge pump circuit 21 , the driving circuit 23 and the ground, so as to ensure that the circuit of the entire laser ranging controller 100 is more reliable.

Specifically, the working principle of this embodiment is as follows: when the laser ranging controller 100 needs to drive the off-chip laser transmitter 3 to perform laser emission, the control module 1 enables the clock signal generating circuit 20, so the The clock signal generation circuit 20 outputs a clock signal; at this time, the charge pump circuit 21 uses the clock signal to generate an electrical output clock signal for charging, so as to raise the low-level voltage to the required level of the laser transmitter 3 high-level voltage, and supply power to the anode of the laser transmitter 3; at the same time, the control module 1 sends a pulse control signal to the pulse generation circuit, so that the pulse generation circuit works and according to the pulse control signal A pulse signal corresponding to the pulse width is output, and the driving circuit 23 forms a driving voltage of the laser transmitter 3 according to the pulse signal at this time to drive the cathode of the laser transmitter 3, and finally makes the laser transmitter 3 Carry out laser emission work. When the laser ranging controller 100 drives the laser transmitter 3 to work, the electrostatic discharge circuit 24 forms an electrostatic discharge circuit between the charge pump circuit 21 , the driving circuit 23 and the ground, thereby ensuring that the entire circuit has robustness.

To sum up, the embodiment of the present invention can integrate the driving function and power supply function of the laser transmitter 3 into the laser ranging controller 100 in a reliable manner, so that it is not necessary to separately configure a driving module 2 including the laser transmitter 3 and a power supply module. The independent chip reduces the hardware cost of laser ranging.

As an example, referring to FIG. 1 , the clock signal generation circuit 20 includes a ring oscillator 200 and a first level shift circuit 201 ; the ring oscillator 200 is used for enabling control in the control module 1 The lower output is a clock signal of the first voltage; the input end of the first level shift circuit 201 is connected to the output end of the ring oscillator 200, and the output end of the first level shift circuit 201 is connected to the charge The input terminal of the pump circuit 21 is connected, and the first level shift circuit 201 is used for shifting the level of the clock signal to a second voltage.

In this embodiment, when the laser ranging controller 100 needs to drive the off-chip laser transmitter 3 to perform laser emitting work, the control module 1 enables the ring oscillator 200 to make the ring oscillator 3 200 works and outputs a clock signal with a fixed frequency after the oscillation is stable; and the first level shift circuit 201 shifts the level of the clock signal to the second voltage at this time, so that the charge pump circuit 21 performs Normal charging boost works. As an example, the first voltage is 1.5V, the second voltage is 3.3V, and the third output voltage of the charge pump circuit 21 is 5V.

In addition, as an example, referring to FIG. 2 , the ring oscillator 200 is a ring circuit composed of an odd number of NOT gates, and the output of the ring circuit is two levels generated by continuous oscillation, thereby forming a clock signal. As an example, referring to FIG. 3 , the first level shift circuit 201 includes a first PMOS transistor P1 , a second PMOS transistor P2 , a third PMOS transistor P3 , a fourth PMOS transistor P4 , a first NMOS transistor N1 , and a second PMOS transistor P3 . NMOS transistor N2 and NOT gate circuit NG1; the gates of the first PMOS transistor P1 and the first NMOS transistor N1 are connected to a low-level voltage, and the drain of the first PMOS transistor P1 is connected to the The drain of the first NMOS transistor N1 is connected, the source of the NMOS transistor is grounded, and the source of the first PMOS transistor P1 is connected to the drain of the second PMOS transistor P2; The source is connected to the source of the third PMOS transistor P3, and the gate of the third PMOS transistor P3 is connected to both the drain of the first PMOS transistor P1 and the drain of the first NMOS transistor N1 In between, the drain of the third PMOS transistor P3 is connected to the source of the fourth PMOS transistor P4, the drain of the fourth PMOS transistor P4 is connected to the drain of the second NMOS transistor N2, so The drains of the fourth PMOS transistor P4 and the second NMOS transistor N2 are connected to the input end of the charge pump circuit 21; the source of the second NMOS transistor N2 is grounded; the second PMOS transistor P2 The gate is connected between the drain of the fourth PMOS transistor P4 and the drain of the second NMOS transistor N2; the gate of the third PMOS transistor P3 is connected to the drain of the first PMOS transistor P1 between the first NMOS transistor N1 and the drain of the first NMOS transistor N1; the input end of the NOT gate circuit NG1 is connected to the gates of the first PMOS transistor P1 and the first NMOS transistor N1, the The output terminal of the gate circuit NG1 is connected to the gates of both the fourth PMOS transistor P4 and the second NMOS transistor N2.

As an example, referring to FIG. 1 , the pulse signal generating circuit 22 includes a pulse signal generator 220 and a second level shift circuit 221 ; the input terminal of the pulse signal generator 220 is connected to the control module 1 The pulse control signal output terminal is connected, which is used for outputting a pulse signal corresponding to the pulse width and the first voltage according to the pulse control signal; the input terminal of the second level shift circuit 221 is connected to the pulse signal generator 220. The output end of the second level shift circuit 221 is connected to the input end of the drive circuit 23, and the second level shift circuit 221 is used to shift the level of the pulse signal to the same level as the The driving circuit 23 operates to match the second voltage.

In this embodiment, when the laser ranging controller 100 needs to drive the off-chip laser transmitter 3 to perform laser emission, the control module 1 sends a pulse control signal to the pulse signal generator 220 to control the The pulse signal generator 220 works, and the pulse signal generator 220 outputs a pulse signal corresponding to the pulse width and is the first voltage according to the pulse control signal; and the second level shift circuit 221 will The level of the pulse signal is shifted to a second voltage matching the operation of the driving circuit 23 , so that the driving circuit 23 operates normally. As an example, the first voltage is 1.5V, and the second voltage is 3.3V. It can be understood that, for the circuit structure of the second level shift circuit 221 , reference may be made to the circuit structure of the first level shift circuit 201 in the foregoing embodiment, and details are not described herein again.

In addition, as an example, referring to FIG. 4 , the pulse control signal sent by the control module 1 to the pulse signal generator 220 includes a pulse width control signal and a pulse trigger signal, and the pulse signal generator 220 includes an adjustable delay Module 2200; the pulse width control signal terminal of the adjustable delay module 2200 is connected to the pulse width control signal terminal of the control module 1, and the pulse trigger signal terminal of the adjustable delay module 2200 is connected to the control module 1 The output end of the adjustable delay module 2200 is connected to the input end of the drive circuit 23; the adjustable delay module 2200 is used for the pulse trigger signal sent by the control module 1 Carry out the pulse signal triggering work, the adjustable delay module 2200 is used to output the pulse signal corresponding to the pulse width according to the pulse width control signal sent by the control module 1, and the adjustable delay module 2200 is triggered by the pulse trigger signal. , and finally output the pulse signal corresponding to the pulse width. More specifically, referring to FIG. 5 , the adjustable delay module 2200 includes several PMOS transistor circuits 22001 connected in parallel, several NMOS transistor circuits 22002 connected in parallel, the main PMOS transistor P7, the main NMOS transistor N7 and the capacitor C1; The PMOS transistor circuit 22001 includes a secondary PMOS transistor P6 and a resistor, the gate of the secondary PMOS transistor P6 is connected to the pulse width control signal terminal of the control module 1, and the source of the secondary PMOS transistor P6 is connected to a voltage The source of the secondary PMOS transistor P6 is connected to the source of the main PMOS transistor P7; the NMOS transistor circuit 22002 includes a secondary NMOS transistor N6 and a resistor, and the gate of the secondary NMOS transistor N6 is connected to the source of the primary PMOS transistor P7. The pulse width control signal terminal of the control module 1 is connected, the source of the auxiliary NMOS transistor N6 is grounded, and the drain of the auxiliary NMOS transistor N6 is connected to the source of the main NMOS transistor N7; the main PMOS transistor P7 The gate of the main NMOS transistor N7 and the gate of the main NMOS transistor N7 are both connected to the pulse trigger signal terminal of the control module 1, and the drain of the main PMOS transistor P7 and the drain of the main NMOS transistor N7 are both connected to The input end of the drive circuit 23 is connected, one end of the capacitor C1 is connected to the input end of the drive circuit 23 , and the other end of the capacitor C1 is grounded.

In this embodiment, when the laser ranging controller 100 needs to drive the off-chip laser transmitter 3 to perform laser emission, the control module 1 sends a pulse width control signal and a pulse to the pulse signal generator 220 Trigger signal, the pulse trigger signal Pulse_trig controls the on-off of the main NMOS transistor N7 and the main PMOS transistor P7, and the pulse width control signals Pulse_ctrl1~Pulse_ctrln change the size of the charging current to the capacitor C1C0, so as to finally obtain the required width of the pulse signal. Therefore, in this embodiment, the pulse width can be controlled, and the pulse width can be adjusted according to the requirements of laser ranging, and then the luminous power of the laser transmitter 3 can be changed to meet the performance requirements of TOF ranging.

As an example, the power supply voltage of both the clock signal generating circuit 20 and the pulse signal generating circuit 22 is lower than the power supply voltage of the driving circuit 23; the power supply voltage of the driving circuit 23 is lower than that of the charge pump the output voltage of the circuit 21 . For example, the power supply voltage of the clock signal generating circuit 20 and the pulse signal generating circuit 22 is 1.5V, the power supply voltage of the driving circuit 23 is 3.3V, and the output voltage of the charge pump circuit 21 is 5V . Specifically, referring to FIG. 1 , the pulse signal generator 220 and the ring oscillator 200 are in the first power supply domain 80 of the laser ranging controller, and the driving circuit 23 is in the laser ranging controller. In the second power domain 81 of the controller, the charge pump circuit 21 and the power clamp circuit 240 are in the third power domain 82 of the laser ranging controller.

As an example, referring to FIG. 1 , the drive circuit 23 includes a pre-drive circuit 230 and a switch circuit 231 ; the input end of the pre-drive circuit 230 is connected to the output end of the pulse signal generating circuit 22 , and its input end is connected to the output end of the pulse signal generating circuit 22 , which The output terminal is connected to the input terminal of the switch circuit 231 , which is used to pre-drive the switch circuit 231 according to the pulse signal; the output terminal of the switch circuit 231 is used to connect to the cathode of the laser transmitter 3 . Wherein, when the pre-driving circuit 230 receives the pulse signal from the pulse signal generating circuit 22, the pre-driving circuit 230 forms a driving voltage according to the pulse signal, and the driving voltage is applied to the switching circuit 231 so that the The switch circuit 231 is closed to output the driving voltage of the laser transmitter 3 .

As an example, referring to FIG. 1 , the switch circuit 231 includes a first switch tube N1 ; the input end of the first switch tube N1 is connected to the output end of the pre-driver circuit 230 , and the first switch tube N1 The ground terminal is grounded, and the output terminal of the first switch tube N1 is used for connecting with the cathode of the laser transmitter 3 . Specifically, the first switch transistor N1 is a high-voltage NMOS transistor. Of course, the first switch transistor N1 may also be a triode or a PMOS transistor, which is not specifically limited herein.

As an example, referring to FIG. 1 , the electrostatic discharge circuit 24 includes a power clamp circuit 240 , a first electrostatic protection diode circuit 241 and a second electrostatic protection diode circuit 242 ; one end of the power clamp circuit 240 is connected to the output end of the charge pump circuit 21, and the other end of the power clamp circuit 240 is grounded; the negative electrode of the first electrostatic protection diode circuit 241 is connected to the output end of the charge pump circuit 21, and the first electrostatic protection diode circuit 241 is connected to the output end of the charge pump circuit 21. The anode of an electrostatic protection diode circuit 241 is connected to the output terminal of the driving circuit 23; the cathode of the second electrostatic protection diode circuit 242 is connected to the output terminal of the driving circuit 23, and the second electrostatic protection diode circuit 242 The positive pole is grounded.

In this embodiment, the power supply clamping circuit 240 clamps the peak value of the output voltage of the charge pump circuit 21 to a predetermined level, and the first electrostatic protection diode circuit 241 is in the charge pump circuit. 21 and the output end of the drive circuit 23 form an electrostatic discharge circuit, the second electrostatic protection diode circuit 242 forms an electrostatic discharge circuit between the output end of the drive circuit 23 and the ground, so as to ensure the entire circuit robustness.

As an example, referring to FIG. 6 , the first electrostatic protection diode circuit 241 includes a first electrostatic protection diode ESD1, and the second electrostatic protection diode circuit 242 includes a second electrostatic protection diode ESD2.

As an example, referring to FIG. 6 , the power clamp circuit 240 includes a first thick gate oxide NMOS transistor N8, a second thick gate oxide NMOS transistor N9, a third thick gate oxide NMOS transistor N10, and a first thick gate oxide PMOS transistor P8 and a resistor; one end of the resistor is connected to the output end of the charge pump circuit 21, and the other end of the resistor is connected to the gate of the first thick gate oxide NMOS transistor N8, the first thick gate oxide The source and drain of the NMOS transistor N8 are grounded; the source of the first thick gate oxide PMOS transistor P8 is connected to the output end of the charge pump circuit 21 , and the gate of the first thick gate oxide PMOS transistor P8 is connected to Between the resistor and the capacitor C1, the drain of the first thick gate oxide PMOS transistor P8 is connected to the drain of the second thick gate oxide NMOS transistor N9. The gate of the NMOS transistor N9 is connected between the resistor and the gate of the first thick gate oxide NMOS transistor N8, the source of the second thick gate oxide NMOS transistor N9 is grounded; The drain of the gate oxide NMOS transistor N10 is connected to the output end of the charge pump circuit 21, and the gate of the third thick gate oxide NMOS transistor N10 is connected to the drain of the first thick gate oxide PMOS transistor P8 and the Between the drains of the second thick gate oxide NMOS transistor N9, the source of the third thick gate oxide NMOS transistor N10 is grounded.

In this embodiment, the power clamp circuit 240 uses a high-voltage MOS transistor with thick gate oxide, thus providing a main discharge path for the electrostatic current output from the high-voltage output of the charge pump circuit 21 to the ground. In the power clamp circuit 240 of the gate oxide, the device cannot withstand high voltage, which is likely to cause breakdown and damage of the device, and eventually the entire circuit structure will fail.

Another embodiment of the present invention provides a laser ranging device, which includes the laser ranging controller 100 described in any of the above solutions.

The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited to this. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, All should be included within the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims (10)

1. A laser ranging controller is characterized by comprising a driving module and a control module used for sending pulse control signals to the driving module; the driving module includes:

a clock signal generating circuit for outputting a clock signal under the enable control of the control module;

the input end of the charge pump circuit is used for being connected with a low-level voltage, the control end of the charge pump circuit is connected with the output end of the clock signal generating circuit, the charge pump circuit is used for charging by using the clock signal so as to raise the low-level voltage to a high-level voltage required by a laser transmitter, and the output end of the charge pump circuit is used for being connected with the anode of the laser transmitter;

the input end of the pulse signal generating circuit is connected with the pulse control signal output end of the control module and is used for outputting a pulse signal corresponding to the pulse width according to the pulse control signal;

the input end of the driving circuit is connected with the output end of the pulse signal generating circuit, the driving circuit is used for forming driving voltage of the laser emitter according to the pulse signal, and the output end of the driving circuit is connected with the cathode of the laser emitter; and a process for the preparation of a coating,

and the electrostatic discharge circuit is connected among the output end of the charge pump circuit, the output end of the drive circuit and the ground and is used for forming an electrostatic discharge loop.

2. The laser ranging controller of claim 1, wherein the clock signal generation circuit comprises a ring oscillator and a first level shift circuit;

the ring oscillator is used for outputting a clock signal of a first voltage under the enabling control of the control module;

the input end of the first level shift circuit is connected with the output end of the ring oscillator, the output end of the first level shift circuit is connected with the input end of the charge pump circuit, and the first level shift circuit is used for shifting the level of the clock signal to a second voltage.

3. The laser ranging controller according to claim 1, wherein the pulse signal generating circuit comprises a pulse signal generator and a second level shifting circuit;

the input end of the pulse signal generator is connected with the pulse control signal output end of the control module and used for outputting a pulse signal which corresponds to the pulse width and is a first voltage according to the pulse control signal;

the input end of the second level shift circuit is connected with the output end of the pulse signal generator, the output end of the second level shift circuit is connected with the input end of the driving circuit, and the second level shift circuit is used for shifting the level of the pulse signal to a second voltage.

4. The laser ranging controller according to claim 1, wherein power supply voltages of both the clock signal generating circuit and the pulse signal generating circuit are smaller than a power supply voltage of the driving circuit; the power supply voltage of the driving circuit is less than the output voltage of the charge pump circuit.

5. The laser range finder controller of claim 1, wherein the drive circuit comprises a pre-drive circuit and a switch circuit;

the input end of the pre-driving circuit is connected with the output end of the pulse signal generating circuit, the output end of the pre-driving circuit is connected with the input end of the switching circuit, and the pre-driving circuit is used for pre-driving the switching circuit according to the pulse signal;

and the output end of the switching circuit is used for being connected with the cathode of the laser emitter.

6. The laser range finder controller of claim 5, wherein the switching circuit comprises a first switching tube; the input end of the first switch tube is connected with the output end of the pre-driving circuit, the grounding end of the first switch tube is grounded, and the output end of the first switch tube is used for being connected with the cathode of the laser emitter.

7. The laser ranging controller according to claim 6, wherein the first switch tube is a high voltage NMOS tube.

8. The laser ranging controller of claim 1, wherein the electrostatic discharge circuit comprises a power clamp circuit, a first electrostatic protection diode circuit, and a second electrostatic protection diode circuit;

one end of the power supply clamping circuit is connected with the output end of the charge pump circuit, and the other end of the power supply clamping circuit is grounded;

the negative electrode of the first electrostatic protection diode circuit is connected with the output end of the charge pump circuit, and the positive electrode of the first electrostatic protection diode circuit is connected with the output end of the drive circuit;

the negative electrode of the second electrostatic protection diode circuit is connected with the output end of the driving circuit, and the positive electrode of the second electrostatic protection diode circuit is grounded.

9. The laser ranging controller according to claim 8, wherein the power supply clamp circuit comprises a first thick gate oxide NMOS transistor, a second thick gate oxide NMOS transistor, a third thick gate oxide NMOS transistor, a first thick gate oxide PMOS transistor and a resistor;

one end of the resistor is connected with the output end of the charge pump circuit, the other end of the resistor is connected with the grid electrode of the first thick-grid oxide NMOS tube, and the source electrode and the drain electrode of the first thick-grid oxide NMOS tube are grounded; the source electrode of the first thick gate oxygen PMOS tube is connected with the output end of the charge pump circuit, the grid electrode of the first thick gate oxygen PMOS tube is connected between the resistor and the capacitor, the drain electrode of the first thick gate oxygen PMOS tube is connected with the drain electrode of the second thick gate oxygen NMOS tube, the grid electrode of the second thick gate oxygen NMOS tube is connected between the resistor and the grid electrode of the first thick gate oxygen NMOS tube, and the source electrode of the second thick gate oxygen NMOS tube is grounded; the drain electrode of the third thick gate oxide NMOS tube is connected with the output end of the charge pump circuit, the grid electrode of the third thick gate oxide NMOS tube is connected between the drain electrode of the first thick gate oxide PMOS tube and the drain electrode of the second thick gate oxide NMOS tube, and the source electrode of the third thick gate oxide NMOS tube is grounded.

10. A laser ranging device comprising a laser ranging controller as claimed in claims 1-9.

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