Laser distance measuring controller and laser distance measuring equipment

Abstract

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

Description

Technical Field

[0001] The present invention relates to the technical field of laser distance measurement, and in particular to a laser distance measurement controller and a laser distance measurement device. Background Art

[0002] In recent years, Direct Time of Flight (dTOF) technology has been increasingly widely used in fields such as unmanned driving, LiDAR, and machine vision, and is considered to be one of the most accurate, reliable, and effective distance measurement methods in the future. The principle of dTOF technology is that a laser pulse is emitted from a laser transmitter, reflected by an object, and reaches a laser receiver, which records the round-trip flight time of the laser pulse and uses it to perform precise distance measurement.

[0003] At present, the laser ranging controller commonly used in dTOF technology generally includes a control module for sending a pulse control signal to the driving module of the laser emitter. The control module enables the driving module to output a driving signal to the laser emitter by sending a pulse control signal to the driving module arranged outside the chip. The laser emitter is powered by a high voltage supply outside the chip and performs laser emission according to the driving signal. The inventor has found through research that: since the existing laser ranging controller cannot integrate the driving module of the laser emitter and the power supply module of the laser emitter, but needs to separately manufacture the laser ranging controller, the driving module of the laser emitter and the power supply module, the hardware cost of the laser ranging is relatively high. Therefore, there is an urgent need for a technology that can integrate the driving function and the power supply function of the laser emitter into the laser ranging controller in a reliable manner to reduce the hardware cost of the laser ranging. Summary of the invention

[0004] In view of the above problems, the object 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 hardware cost of laser ranging.

[0005] In order to achieve the above object, an embodiment of the present invention provides a laser ranging controller, which includes a driving module and a control module for sending a pulse control signal to the driving module; the driving module includes:

[0006] A clock signal generating circuit, which is used to output a clock signal under the enabling control of the control module;

[0007] A charge pump circuit, whose input end is used to be connected to a low-level voltage, whose control end is connected to the output end of the clock signal generating circuit, and which is used to charge with the clock signal to increase the low-level voltage to a high-level voltage required by the laser emitter, and whose output end is used to be connected to the anode of the laser emitter;

[0008] A pulse signal generating circuit, whose input end is connected to the pulse control signal output end of the control module, and is used to output a pulse signal of corresponding pulse width according to the pulse control signal;

[0009] a driving circuit, whose input end is connected to the output end of the pulse signal generating circuit, and is used to form a driving voltage for the laser emitter according to the pulse signal, and whose output end is used to be connected to the cathode of the laser emitter; and,

[0010] The electrostatic discharge circuit is connected between the output end of the charge pump circuit, the output end of the drive circuit and the ground, and is used to form an electrostatic discharge loop.

[0011] As an improvement of the above solution, the clock signal generating circuit includes a ring oscillator and a first level shifting circuit;

[0012] The ring oscillator is used to output a clock signal of a first voltage under the enabling control of the control module;

[0013] The input end of the first level shift circuit is connected to the output end of the ring oscillator, the output end of the first level shift circuit is connected to the input end of the charge pump circuit, and the first level shift circuit is used to shift the level of the clock signal to a second voltage.

[0014] As an improvement of the above solution, the pulse signal generating circuit includes a pulse signal generator and a second level shift circuit;

[0015] The input end of the pulse signal generator is connected to the pulse control signal output end of the control module, and is used to output a pulse signal of a first voltage corresponding to the pulse width according to the pulse control signal;

[0016] 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 driving circuit, and the second level shift circuit is used to shift the level of the pulse signal to a second voltage.

[0017] As an improvement to the above scheme, the power supply voltages of both the clock signal generating circuit and the pulse signal generating circuit are lower than the power supply voltage of the driving circuit; and the power supply voltage of the driving circuit is lower than the output voltage of the charge pump circuit.

[0018] As an improvement of the above solution, the driving circuit includes a pre-driving circuit and a switching circuit;

[0019] The pre-driving circuit has an input end connected to the output end of the pulse signal generating circuit, and an output end connected to the input end of the switch circuit, and is used to pre-drive the switch circuit according to the pulse signal;

[0020] The output end of the switch circuit is used to be connected to the cathode of the laser emitter.

[0021] As an improvement of the above scheme, the switching circuit includes a first switching tube; the input end of the first switching tube is connected to the output end of the pre-driving circuit, the ground end of the first switching tube is grounded, and the output end of the first switching tube is used to connect to the cathode of the laser emitter.

[0022] As an improvement of the above solution, the first switch tube is a high-voltage NMOS tube.

[0023] 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;

[0024] 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;

[0025] 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;

[0026] A cathode of the second electrostatic protection diode circuit is connected to the output end of the driving circuit, and an anode of the second electrostatic protection diode circuit is grounded.

[0027] 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;

[0028] 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-oxide NMOS tube, and the source and drain of the first thick-oxide NMOS tube are grounded; the source of the first thick-oxide PMOS tube is connected to the output end of the charge pump circuit, the gate of the first thick-oxide PMOS tube is connected between the resistor and the capacitor, the drain of the first thick-oxide PMOS tube is connected to the drain of the second thick-oxide NMOS tube, the gate of the second thick-oxide NMOS tube is connected between the resistor and the gate of the first thick-oxide NMOS tube, and the source of the second thick-oxide NMOS tube is grounded; the drain of the third thick-oxide NMOS tube is connected to the output end of the charge pump circuit, the gate of the third thick-oxide NMOS tube is connected between the drain of the first thick-oxide PMOS tube and the drain of the second thick-oxide NMOS tube, and the source of the third thick-oxide NMOS tube is grounded.

[0029] Another embodiment of the present invention provides a laser ranging device, which includes a laser ranging controller as described in any of the above solutions.

[0030] 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:

[0031] 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 increase the low-level voltage to the high-level voltage required by the laser emitter, thereby realizing the integration of a power supply function in the laser ranging controller; by integrating a pulse signal generating circuit and a driving circuit in the laser ranging controller, the driving circuit can use the pulse control signal generated by the pulse signal generating circuit to form a driving voltage for the laser emitter, thereby realizing the integration of a driving function in the laser ranging controller; in addition, when the above circuits are integrated in the laser ranging controller to realize the integration of a driving function and a power supply function, 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 electrostatic discharge circuit forms an electrostatic discharge loop between the charge pump circuit, the driving circuit and the ground, thereby ensuring that the circuit of the entire laser ranging controller is more reliable. From the above analysis, it can be seen that the embodiment of the present invention can integrate the driving function and power supply function of the laser emitter into the laser ranging controller in a reliable manner, thereby eliminating the need to separately configure an independent chip including the driving module and power supply module of the laser emitter, thereby reducing the hardware cost of laser ranging. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solution of the present invention, the drawings required for use in the implementation mode will be briefly introduced below. Obviously, the drawings described below are only some implementation modes of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0033] Figure 1 It is a circuit architecture diagram of a laser ranging controller provided by one embodiment of the present invention;

[0034] Figure 2 is a schematic diagram of the circuit structure of a ring oscillator provided by an embodiment of the present invention;

[0035] Figure 3 is a schematic diagram of the circuit structure of a level shift circuit provided by an embodiment of the present invention;

[0036] Figure 4 1 is a schematic diagram of a circuit structure of a pulse signal generator provided by an embodiment of the present invention;

[0037] Figure 5 1 is a schematic diagram of the circuit structure of an adjustable delay module provided in one embodiment of the present invention;

[0038] Figure 6 It is a circuit structure schematic diagram of an electrostatic discharge circuit provided in one embodiment of the present invention. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] The terms "first", "second", etc. in the specification and claims are only used for the purpose of describing the same technical features, and are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated, nor necessarily describing an order or time sequence. The terms are interchangeable where appropriate. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0041] In addition, reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with 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.

[0042] See also Figure 1An 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 to output a clock signal under the enable control of the control module 1; the charge pump circuit 21, whose input end is used to connect with a low-level voltage, whose control end is connected with the output end of the clock signal generating circuit 20, is used to charge with the clock signal to increase the low-level voltage to the high-level voltage required by the laser emitter 3, and whose output end is used to connect with the anode of the laser emitter 3. Among them, 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 charge with the clock signal generated by the clock signal to generate an electrical output clock signal to increase the low-level voltage to the high-level voltage required by the laser emitter 3, thereby realizing the integration of a power supply function in the laser ranging controller 100. In addition, the pulse signal generating circuit 22 has an input end connected to the pulse control signal output end of the control module 1, and is used to output a pulse signal of a corresponding pulse width according to the pulse control signal; the driving circuit 23 has an input end connected to the output end of the pulse signal generating circuit 22, and is used to form a driving voltage for the laser emitter 3 according to the pulse signal, and its output end is used to be connected to the cathode of the laser emitter 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 use the pulse control signal generated by the pulse signal generating circuit 22 to form the driving voltage for the laser emitter 3, thereby realizing the integration of a driving function in the laser ranging controller 100. When the above circuit is integrated in 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 electrostatic discharge circuit 24 is integrated in the laser ranging controller 100, and the electrostatic discharge circuit 24 is connected between the output end of the charge pump circuit 21, the output end of the drive circuit 23 and the ground. The electrostatic discharge circuit 24 is used to form an electrostatic discharge loop between the charge pump circuit 21, the drive circuit 23 and the ground, so as to ensure that the circuit of the entire laser ranging controller 100 is more reliable.

[0043] Specifically, the working principle of this embodiment is as follows: when the laser ranging controller 100 needs to drive the laser emitter 3 outside the chip to perform laser emission, the control module 1 enables the clock signal generating circuit 20, and the clock signal generating circuit 20 outputs a clock signal; at this time, the charge pump circuit 21 uses the clock signal to generate an electrically output clock signal for charging, so as to increase the low-level voltage to the high-level voltage required by the laser emitter 3, and to supply power to the anode of the laser emitter 3; at the same time, the control module 1 sends a pulse control signal to the pulse generating circuit, so that the pulse generating circuit works and outputs a pulse signal corresponding to the pulse width according to the pulse control signal, and the drive circuit 23 forms a drive voltage of the laser emitter 3 according to the pulse signal to drive the cathode of the laser emitter 3, and finally enables the laser emitter 3 to perform laser emission. In the process of the laser ranging controller 100 driving the laser emitter 3 to work, the electrostatic discharge circuit 24 forms an electrostatic discharge loop between the charge pump circuit 21, the drive circuit 23 and the ground, thereby ensuring the robustness of the entire circuit.

[0044] In summary, the embodiment of the present invention can integrate the driving function and power supply function of the laser emitter 3 into the laser ranging controller 100 in a reliable manner, thereby eliminating the need to separately configure an independent chip including the driving module 2 and the power supply module of the laser emitter 3, thereby reducing the hardware cost of laser ranging.

[0045] As one example, see Figure 1 The clock signal generating circuit 20 includes a ring oscillator 200 and a first level shift circuit 201; the ring oscillator 200 is used to output a clock signal of a first voltage under the enable control of the control module 1; the input end of the first level shift circuit 201 is connected to the output end of the ring oscillator 200, the output end of the first level shift circuit 201 is connected to the input end of the charge pump circuit 21, and the first level shift circuit 201 is used to shift the level of the clock signal to a second voltage.

[0046] In this embodiment, when the laser ranging controller 100 needs to drive the laser emitter 3 outside the chip to perform laser emission, the control module 1 enables the ring oscillator 200, so that the ring oscillator 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 and boosting work. As an example, the first voltage is 1.5V, the second voltage is 3.3V, and the output third voltage of the charge pump circuit 21 is 5V.

[0047] In addition, see, for example, Figure 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, see Figure 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, a second NMOS transistor N2 and a NOT gate circuit NG1; the gates of the first PMOS transistor P1 and the first NMOS transistor N1 are both connected to a low level voltage, the drain of the first PMOS transistor P1 is connected to the drain of the first NMOS transistor N1, the source of the NMOS transistor is grounded, the source of the first PMOS transistor P1 is connected to the drain of the second PMOS transistor P2; the source of the second PMOS transistor P2 is connected to the source of the third PMOS transistor P3, the gate of the third PMOS transistor P3 is connected between the drain of the first PMOS transistor P1 and the drain of the first NMOS transistor N1, the drain of the third PMOS transistor P3 is grounded, and the drain of the first PMOS transistor P1 is connected to the drain of the second PMOS transistor P2. The source of the fourth PMOS tube P4 is connected, the drain of the fourth PMOS tube P4 is connected to the drain of the second NMOS tube N2, and the drains of the fourth PMOS tube P4 and the second NMOS tube N2 are connected to the input end of the charge pump circuit 21; the source of the second NMOS tube N2 is grounded; the gate of the second PMOS tube P2 is connected between the drain of the fourth PMOS tube P4 and the drain of the second NMOS tube N2; the gate of the third PMOS tube P3 is connected between the drain of the first PMOS tube P1 and the drain of the first NMOS tube N1; the input end of the NOT gate circuit NG1 is connected to the gates of the first PMOS tube P1 and the first NMOS tube N1, and the output end of the NOT gate circuit NG1 is connected to the gates of the fourth PMOS tube P4 and the second NMOS tube N2.

[0048] As one example, see Figure 1 The pulse signal generating circuit 22 includes a pulse signal generator 220 and a second level shift circuit 221; the input end of the pulse signal generator 220 is connected to the pulse control signal output end of the control module 1, and is used to output a pulse signal of a first voltage and a corresponding pulse width according to the pulse control signal; the input end of the second level shift circuit 221 is connected to the output end of the pulse signal generator 220, and the output end of the second level shift circuit 221 is connected to the input end of the driving circuit 23, and the second level shift circuit 221 is used to shift the level of the pulse signal to a second voltage that matches the operation of the driving circuit 23.

[0049] In this embodiment, when the laser ranging controller 100 needs to drive the laser emitter 3 outside the chip to perform laser emission, the control module 1 sends a pulse control signal to the pulse signal generator 220 to control the operation of the pulse signal generator 220, and the pulse signal generator 220 outputs a pulse signal of a first voltage corresponding to the pulse width according to the pulse control signal; and the second level shift circuit 221 shifts the level of the pulse signal to a second voltage that matches the operation of the drive circuit 23, so that the drive circuit 23 works normally. As an example, the first voltage is 1.5V and the second voltage is 3.3V. It can be understood that the circuit structure of the second level shift circuit 221 can refer to the circuit structure of the first level shift circuit 201 in the above embodiment, and will not be repeated here.

[0050] In addition, see, for example, Figure 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 end of the adjustable delay module 2200 is connected to the pulse width control signal end of the control module 1, the pulse trigger signal end of the adjustable delay module 2200 is connected to the pulse trigger signal end of the control module 1, and 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 to perform pulse signal triggering according to the pulse trigger signal sent by the control module 1, and the adjustable delay module 2200 is used to output a pulse signal of corresponding pulse width according to the pulse width control signal sent by the control module 1, and the adjustable delay module 2200 finally outputs a pulse signal of corresponding pulse width under the triggering of the pulse trigger signal. For more details, see Figure 5The adjustable delay module 2200 includes a plurality of PMOS tube circuits 22001 connected in parallel, a plurality of NMOS tube circuits 22002 connected in parallel, a main PMOS tube P7, a main NMOS tube N7 and a capacitor C1; the PMOS tube circuit 22001 includes a pair of PMOS tubes P6 and a resistor, the gate of the pair of PMOS tubes P6 is connected to the pulse width control signal terminal of the control module 1, the source of the pair of PMOS tubes P6 is connected to a voltage source, and the drain of the pair of PMOS tubes P6 is connected to the source of the main PMOS tube P7; the NMOS tube circuit 22002 includes a pair of NMOS The auxiliary NMOS tube N6 and the resistor, the gate of the auxiliary NMOS tube N6 is connected to the pulse width control signal end of the control module 1, the source of the auxiliary NMOS tube N6 is grounded, and the drain of the auxiliary NMOS tube N6 is connected to the source of the main NMOS tube N7; the gate of the main PMOS tube P7 and the gate of the main NMOS tube N7 are both connected to the pulse trigger signal end of the control module 1, the drain of the main PMOS tube P7 and the drain of the main NMOS tube N7 are both connected to the input end of the drive circuit 23, 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.

[0051] In this embodiment, when the laser ranging controller 100 needs to drive the laser emitter 3 outside the chip to perform laser emission, the control module 1 sends a pulse width control signal and a pulse trigger signal to the pulse signal generator 220. The pulse trigger signal Pulse_trig controls the on-off of the main NMOS tube N7 and the main PMOS tube P7, and the pulse width control signal Pulse_ctrl1~Pulse_ctrln changes the size of the charging current of the capacitor C1C0, thereby finally obtaining a pulse signal of the required width. Therefore, this embodiment can adjust the pulse width according to the needs of laser ranging by being able to realize controllable pulse width, thereby changing the luminous power of the laser emitter 3 to meet the TOF ranging performance requirements.

[0052] As one embodiment, the power supply voltages of the clock signal generating circuit 20 and the pulse signal generating circuit 22 are both lower than the power supply voltage of the driving circuit 23; the power supply voltage of the driving circuit 23 is lower than the output voltage of the charge pump circuit 21. For example, the power supply voltages of the clock signal generating circuit 20 and the pulse signal generating circuit 22 are both 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. For more details, see Figure 1The pulse signal generator 220 and the ring oscillator 200 are in the first power domain 80 of the laser ranging controller, the driving circuit 23 is in the second power domain 81 of the laser ranging controller, and the charge pump circuit 21 and the power clamp circuit 240 are in the third power domain 82 of the laser ranging controller.

[0053] As one example, see Figure 1 , the driving circuit 23 includes a pre-driving circuit 230 and a switch circuit 231; the pre-driving circuit 230, whose input end is connected to the output end of the pulse signal generating circuit 22, and whose output end is connected to the input end of the switch circuit 231, is used to pre-drive the switch circuit 231 according to the pulse signal; the output end of the switch circuit 231 is used to be connected to the cathode of the laser emitter 3. 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 switch circuit 231 so that the switch circuit 231 is closed and outputs the driving voltage of the laser emitter 3.

[0054] For example, see Figure 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-driving circuit 230, the ground end of the first switch tube N1 is grounded, and the output end of the first switch tube N1 is used to connect to the cathode of the laser emitter 3. Specifically, the first switch tube N1 is a high-voltage NMOS tube. Of course, the first switch tube N1 can also be a triode or a PMOS tube, etc., which is not specifically limited here.

[0055] As one example, see Figure 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 cathode of the first electrostatic protection diode circuit 241 is connected to the output end of the charge pump circuit 21, and the anode of the first electrostatic protection diode circuit 241 is connected to the output end of the drive circuit 23; the cathode of the second electrostatic protection diode circuit 242 is connected to the output end of the drive circuit 23, and the anode of the second electrostatic protection diode circuit 242 is grounded.

[0056] In this embodiment, the power supply clamping circuit 240 clamps the peak value of the output voltage of the charge pump circuit 21 at a predetermined level, the first electrostatic protection diode circuit 241 forms an electrostatic discharge circuit between the charge pump circuit 21 and the output end of the drive circuit 23, and the second electrostatic protection diode circuit 242 forms an electrostatic discharge circuit between the output end of the drive circuit 23 and the ground, thereby ensuring the robustness of the entire circuit.

[0057] For example, see Figure 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.

[0058] For example, see Figure 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, 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, the other end of the resistor is connected to the gate of the first thick-gate oxide NMOS transistor N8, the source and drain of the first thick-gate oxide 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, the gate of the first thick-gate oxide PMOS transistor P8 is connected between the resistor and the capacitor C1, and the first thick-gate oxide PMOS transistor P8 is connected to the output end of the charge pump circuit 21. The drain of a thick-gate oxide PMOS tube P8 is connected to the drain of the second thick-gate oxide NMOS tube N9, the gate of the second thick-gate oxide NMOS tube N9 is connected between the resistor and the gate of the first thick-gate oxide NMOS tube N8, and the source of the second thick-gate oxide NMOS tube N9 is grounded; the drain of the third thick-gate oxide NMOS tube N10 is connected to the output end of the charge pump circuit 21, the gate of the third thick-gate oxide NMOS tube N10 is connected between the drain of the first thick-gate oxide PMOS tube P8 and the drain of the second thick-gate oxide NMOS tube N9, and the source of the third thick-gate oxide NMOS tube N10 is grounded.

[0059] In this embodiment, the power clamp circuit 240 uses a high-voltage MOS tube with thick gate oxide, thus providing a main discharge path for the electrostatic current from the high-voltage output of the charge pump circuit 21 to the ground. If a traditional power clamp circuit 240 with thin gate oxide is used, the device cannot withstand the high voltage, which can easily cause device breakdown and damage, ultimately causing the entire circuit structure to fail.

[0060] Another embodiment of the present invention provides a laser ranging device, which includes the laser ranging controller 100 as described in any of the above solutions.

[0061] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the art within the technical scope disclosed in the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A laser ranging controller, characterized in that: It includes a driving module and a control module for sending a pulse control signal to the driving module; the driving module includes: A clock signal generating circuit, which is used to output a clock signal under the enabling control of the control module; A charge pump circuit, whose input end is connected to the output end of the clock signal generating circuit, and is used to charge using the clock signal to increase the low-level voltage to the high-level voltage required by the laser emitter, and whose output end is used to be connected to the anode of the laser emitter; A pulse signal generating circuit, whose input end is connected to the pulse control signal output end of the control module, and is used to output a pulse signal of corresponding pulse width according to the pulse control signal of the control module; a driving circuit, whose input end is connected to the output end of the pulse signal generating circuit, and is used to form a driving voltage for the laser emitter according to the pulse signal, and whose output end is used to be connected to the cathode of the laser emitter; and, An electrostatic discharge circuit, connected between the output end of the charge pump circuit, the output end of the drive circuit and the ground, and used to form an electrostatic discharge loop; The clock signal generating circuit includes a ring oscillator and a first level shift circuit; The ring oscillator is used to output 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 to the output end of the ring oscillator, the output end of the first level shift circuit is connected to the input end of the charge pump circuit, and the first level shift circuit is used to shift the level of the clock signal to a second voltage.

2. The laser ranging controller according to claim 1, characterized in that: The pulse signal generating circuit comprises a pulse signal generator and a second level shift circuit; The input end of the pulse signal generator is connected to the pulse control signal output end of the control module, and is used to output a pulse signal of a first voltage corresponding to the pulse width 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 driving circuit, and the second level shift circuit is used to shift the level of the pulse signal to a second voltage.

3. The laser distance measurement controller according to claim 1, characterized in that: The power supply voltages of both the clock signal generating circuit and the pulse signal generating circuit are lower than the power supply voltage of the driving circuit; and the power supply voltage of the driving circuit is lower than the output voltage of the charge pump circuit.

4. The laser distance measurement controller according to claim 1, characterized in that: The driving circuit includes a pre-driving circuit and a switching circuit; The pre-driving circuit has an input end connected to the output end of the pulse signal generating circuit, and an output end connected to the input end of the switch circuit, and is used to pre-drive the switch circuit according to the pulse signal; The output end of the switch circuit is used to be connected to the cathode of the laser emitter.

5. The laser distance measurement controller according to claim 4, characterized in that: 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-driving circuit, the ground end of the first switch tube is grounded, and the output end of the first switch tube is used to connect to the cathode of the laser emitter.

6. The laser distance measurement controller according to claim 5, characterized in that: The first switch tube is a high-voltage NMOS tube.

7. The laser distance measurement controller according to claim 1, characterized in that: 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; A cathode of the second electrostatic protection diode circuit is connected to the output end of the driving circuit, and an anode of the second electrostatic protection diode circuit is grounded.

8. The laser distance measurement controller according to claim 7, characterized in that: The power clamp circuit comprises 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-oxide NMOS tube, and the source and drain of the first thick-oxide NMOS tube are grounded; the source of the first thick-oxide PMOS tube is connected to the output end of the charge pump circuit, the gate of the first thick-oxide PMOS tube is connected between the resistor and the gate of the first thick-oxide NMOS tube, the drain of the first thick-oxide PMOS tube is connected to the drain of the second thick-oxide NMOS tube, the gate of the second thick-oxide NMOS tube is connected between the resistor and the gate of the first thick-oxide NMOS tube, and the source of the second thick-oxide NMOS tube is grounded; the drain of the third thick-oxide NMOS tube is connected to the output end of the charge pump circuit, the gate of the third thick-oxide NMOS tube is connected between the drain of the first thick-oxide PMOS tube and the drain of the second thick-oxide NMOS tube, and the source of the third thick-oxide NMOS tube is grounded.

9. A laser ranging device, characterized in that: It comprises a laser ranging controller as described in any one of claims 1-8.

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