CN210670660U - Common cathode semiconductor luminotron drive circuit - Google Patents

Abstract

The utility model aims at providing a common cathode semiconductor luminotron drive circuit, including multichannel transistor drive unit, multichannel charge-discharge circuit, sharing electric capacity C, sharing diode D, common cathode luminotron, top tube transistor, low tube transistor, beneficial effect lies in this drive circuit and is used for common cathode luminotron, and peripheral device is few, and the circuit is simple, the stable performance, and multichannel common cathode luminotron does not influence each other, and effectual solution drive module is bulky, with high costs, the complicated scheduling problem of structure, is favorable to the miniaturized design of multi-wire laser.

Description

Common cathode semiconductor luminotron drive circuit

Technical Field

The utility model relates to a semiconductor laser technical field, in particular to common cathode semiconductor luminotron drive circuit.

Background

In recent years, pulse semiconductor lasers have been widely used in many fields such as laser radar and laser ranging, and in a semiconductor laser in a short pulse operating mode, a discharge process of an energy storage element is generally adopted to drive a laser diode to emit light, which has the defects of large generated pulse peak value driving current, fast rising edge, small duty ratio and low average power. At present general semiconductor laser independently gives out light, be not convenient for the miniaturization and the low cost of laser instrument, the appearance of sharing cathode laser pipe has brought hope for laser radar's miniaturization, the switch tube that traditional sharing cathode laser drive circuit used is PMOS pipe or NMOS pipe, there is the lectotype few when using the PMOS pipe, the comparatively complicated problem of drive circuit, drive circuit is high pressure bootstrapping drive usually when using the NMOS pipe, and drive circuit's device can cause harmful effects to the laser pipe discharge circuit.

Therefore, it is desirable to design a novel common cathode semiconductor light emitting tube driving circuit to solve the above problems.

SUMMERY OF THE UTILITY MODEL

In view of the above, an embodiment of the present invention provides a common cathode semiconductor light emitting tube driving circuit.

The utility model aims at providing a common cathode semiconductor luminotron drive circuit, which comprises a plurality of paths of transistor drive units, a plurality of paths of charge-discharge loops, an energy storage unit, a diode unit, a transistor unit, a common cathode semiconductor luminotron unit and a reverse inhibition unit;

the multi-channel transistor driving unit is used for controlling the on and off time sequence of a plurality of transistors in the multi-channel charge and discharge loop.

Further, the energy storage unit comprises a capacitor C;

the transistor unit comprises the upper transistor;

the common cathode semiconductor luminous tube unit is composed of a common cathode semiconductor luminous tube;

the reverse suppressing unit comprises the lower transistor;

furthermore, the lower transistor can be one or more of a diode, an MOSFET and a triode, and forms a discharge loop with the upper transistor, the common cathode light-emitting tube and the capacitor C, so that each discharge loop operates independently and mutual interference is avoided.

The beneficial effects of the utility model reside in that this drive circuit is used for common cathode luminotron, and peripheral device is few, and the circuit is simple, the stable performance, and multichannel common cathode luminotron does not influence each other, and effectual solution drive module is bulky, with high costs, the complicated scheduling problem of structure, is favorable to the miniaturized design of multi-line laser.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.

Fig. 1 is a schematic diagram of a common cathode emission tube driving circuit according to embodiment 1 of the present invention.

Fig. 2 is a schematic diagram of a common cathode emission tube driving circuit according to embodiment 2 of the present invention.

HV is variable high voltage, C is an energy storage capacitor, D is a diode, DL1, DL2, dl3.., DLn is a common cathode light emitting tube, Q1, Q2, Q3 …, Qn, and Qn +1 are transistors, and the multi-channel transistor driving units are transistor driving unit 1, transistor driving unit 2, transistor driving unit 3 …, and transistor driving unit n, respectively.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Example one

Fig. 1 is a schematic diagram of a common cathode emission tube driving circuit according to embodiment 1 of the present invention.

A common cathode semiconductor luminotron drive circuit comprises a multi-channel transistor drive unit, a multi-channel charge-discharge loop, an energy storage unit, a diode unit, a transistor unit, a common cathode semiconductor luminotron unit and a reverse suppression unit;

the following describes a common cathode semiconductor light emitting tube driving circuit according to the present invention in detail with reference to specific embodiments.

The variable high voltage HV forms a charging circuit through a capacitor C and a diode D and is used as a charging loop driven by a plurality of paths of light emitting tubes, when the variable voltage HV is conducted, the capacitor C is charged through the diode D, wherein the capacitor C is an energy storage capacitor, the whole circuit only uses one capacitor, and the diode D is used as a shared diode of the whole circuit;

the upper transistor Q1, the light-emitting tube LD1, the capacitor C and the lower transistor Q2 form one path of a multi-path discharge loop, when the capacitor discharges, the variable high voltage HV is turned off, the lower transistor Q2 is turned on firstly, and the source electrode and the drain electrode of the lower transistor Q2 are approximately short-circuited due to small on-resistance, so that the source electrode of the upper transistor Q1 is equivalent to ground, a high-side bootstrap circuit is not needed at the moment, only the low-side drive Q1 is needed, and at the moment, the capacitor C lights the light-emitting tube LD1 through the upper transistor Q1 to perform; similarly, the nth discharge loop is composed of an upper tube transistor Qn, a common capacitor C, a light emitting tube LDn and a lower tube transistor Qn +1, the lower tube transistor Qn +1 is firstly turned on to ground the source electrode of the upper tube Qn, and then the upper tube transistor Qn is turned on, and the energy storage capacitor C rapidly discharges the light emitting tube LDn through Qn.

Example two

Fig. 2 is a schematic diagram of a common cathode emission tube driving circuit according to embodiment 2 of the present invention.

The variable high voltage HV forms a charging circuit through a capacitor C and a diode D and is used as a charging loop for driving a plurality of paths of light emitting tubes, when the variable voltage HV is conducted, the capacitor C is charged through the diode D, wherein the capacitor C is an energy storage capacitor, a plurality of paths of semiconductor light emitting tube driving circuits in the driving circuit are provided with a plurality of energy storage capacitors C, and the diode D is used as a shared diode of the whole circuit;

the upper transistor Q1, the light-emitting tube LD1, the capacitor C and the lower transistor Q2 form one path of a multi-path discharge loop, when the capacitor discharges, the variable high voltage HV is turned off, the lower transistor Q2 is turned on firstly, and the source electrode and the drain electrode of the lower transistor Q2 are approximately short-circuited due to small on-resistance, so that the source electrode of the upper transistor Q1 is equivalent to ground, a high-side bootstrap circuit is not needed at the moment, only the low-side drive Q1 is needed, and at the moment, the capacitor C lights the light-emitting tube LD1 through the upper transistor Q1 to perform; similarly, the nth discharge loop is composed of an upper tube transistor Qn, a common capacitor C, a light emitting tube LDn and a lower tube transistor Qn +1, the lower tube transistor Qn +1 is firstly turned on to ground the source electrode of the upper tube Qn, and then the upper tube transistor Qn is turned on, and the energy storage capacitor C rapidly discharges the light emitting tube LDn through Qn.

To sum up, the embodiment of the present invention provides a common cathode semiconductor light emitting diode driving circuit.

The present invention has been explained by using specific embodiments, and the explanation of the above embodiments is only used to help understand the method and the core idea of the present invention; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the specific implementation and application scope, to sum up, the content of the present specification should not be understood as the limitation of the present invention.

Claims (3)

1. A common cathode semiconductor light emitting tube driving circuit is characterized in that,

the device comprises a multi-channel transistor driving unit, a multi-channel charge-discharge loop, an energy storage unit, a diode unit, a transistor unit, a common cathode semiconductor light emitting tube unit and a reverse suppression unit;

each charging loop in the multi-path charging and discharging loop comprises a capacitor C, an upper transistor Q1 and a diode D, wherein one end of the capacitor C is connected with the drain electrode of the upper transistor Q1, the other end of the capacitor C is connected with the common cathode of a light-emitting tube, and one end of the diode D is connected with the common cathode of the light-emitting tube and the other end of the diode D is connected with GND;

one of the multi-path charging and discharging loop comprises an upper transistor Q1, a lower transistor Q2 and a capacitor C, wherein the source electrode of the upper transistor Q1 is connected with the anode of a light emitting tube, one end of the lower transistor Q2 is connected with the anode of the light emitting tube, the other end of the lower transistor Q2 is connected with GND, and one end of the capacitor C is connected with the drain electrode of the upper transistor Q1 and is connected with the common cathode of the light emitting tube.

2. A common cathode semiconductor light emitting tube driving circuit according to claim 1,

the multi-path charge-discharge loop comprises one or more capacitors C;

the energy storage unit comprises a capacitor C;

the transistor unit comprises the upper transistor;

the reverse suppressing unit comprises the lower transistor;

the multi-channel transistor driving unit is used for controlling the on and off time sequence of a plurality of transistors in the multi-channel charge and discharge loop.

3. A common cathode semiconductor light emitting tube driving circuit according to claim 1, wherein the reverse suppressing unit comprises a combination of one or more of MOSFET tube, transistor, and diode.

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