CN115087168A - Drive circuit and electronic device - Google Patents

Drive circuit and electronic device Download PDF

Info

Publication number
CN115087168A
CN115087168A CN202210751466.XA CN202210751466A CN115087168A CN 115087168 A CN115087168 A CN 115087168A CN 202210751466 A CN202210751466 A CN 202210751466A CN 115087168 A CN115087168 A CN 115087168A
Authority
CN
China
Prior art keywords
feedback
module
circuit
resistor
switch
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202210751466.XA
Other languages
Chinese (zh)
Inventor
彭亚平
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shenzhen Angstrong Technology Co ltd
Original Assignee
Shenzhen Angstrong Technology Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shenzhen Angstrong Technology Co ltd filed Critical Shenzhen Angstrong Technology Co ltd
Priority to CN202210751466.XA priority Critical patent/CN115087168A/en
Publication of CN115087168A publication Critical patent/CN115087168A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/345—Current stabilisation; Maintaining constant current
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/04—Processes or apparatus for excitation, e.g. pumping, e.g. by electron beams
    • H01S5/042—Electrical excitation ; Circuits therefor
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/04—Processes or apparatus for excitation, e.g. pumping, e.g. by electron beams
    • H01S5/042—Electrical excitation ; Circuits therefor
    • H01S5/0428—Electrical excitation ; Circuits therefor for applying pulses to the laser

Landscapes

  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Optics & Photonics (AREA)
  • Electronic Switches (AREA)

Abstract

The application belongs to the technical field of electronic circuits, and particularly relates to a driving circuit and electronic equipment, wherein the driving circuit comprises a driving module, a switch module and a front-end feedback module, the driving module is used for accessing the voltage of an input power supply and outputting constant current to a load according to feedback, the switch module is connected with the load and the driving module, the input end of the switch module is used for accessing a control signal and switching on or switching off a power supply loop of the load according to the control signal, the front-end feedback module is connected with the driving module, the input end of the front-end feedback module is used for accessing the control signal, the front-end feedback module is used for providing a front-end feedback signal according to the control signal, and the output of the driving module is maintained in a preset range when the load is not switched on. The problem that peak spike current is generated at the moment of load connection due to the hysteresis of output feedback of a traditional driving circuit is solved.

Description

Drive circuit and electronic device
Technical Field
The application belongs to the technical field of electronic circuits, and particularly relates to a driving circuit and electronic equipment.
Background
A Vertical Cavity Surface Emitting Laser (VCSEL) in the 3D structured light technology is a commonly used semiconductor laser in the 3D structured light technology, the semiconductor laser works by direct injection of carriers, and the stability of the injected current has a direct and obvious influence on the output of the laser, so the VCSEL driving technology generally adopts a constant current driving mode, and generally requires high stability of the output current, small surge impact current, and small ripple.
The VCSEL is driven by using a constant current driving chip, a switching circuit is generally required to be added to convert a continuous driving signal of the constant current driving chip into a pulse driving signal, and the constant current driving chip generally obtains a feedback voltage through a feedback resistor to output a constant current. The adjustment process of the constant current according to the feedback has hysteresis, so that peak burr current is generated when a chip drives a switch to act, the instantaneous peak burr large current seriously reduces the reliability and the service life of the VCSEL, and meanwhile, certain impact can be caused to a power supply system.
Disclosure of Invention
In view of this, embodiments of the present application provide a driving circuit and an electronic device, which aim to solve the problem that a peak glitch current is generated at a load turn-on instant of a conventional driving circuit due to a hysteresis of output feedback.
A first aspect of an embodiment of the present application provides a driving circuit, including: the driving module is used for accessing input voltage and outputting constant current to a load according to a feedback signal; the switch module is connected with the load and the driving module, the input end of the switch module is used for accessing a control signal, the switch module is used for switching on a power supply loop of the load when the control signal is in a first state, providing the feedback signal to the driving module, and switching off the power supply loop of the load when the control signal is in a second state; the input end of the pre-feedback module is used for accessing the control signal, outputting a pre-feedback signal to the driving module when the control signal is in a second state, and stopping outputting the pre-feedback signal when the control signal is in a first state; the driving module is further used for maintaining the output of the load within a preset range according to the pre-feedback signal when a power supply loop of the load is not switched on.
In one embodiment, the voltage amplitude of the pre-feedback signal is in a range of 0.9 times to 1.1 times the voltage amplitude of the feedback signal.
In one embodiment, the pre-feedback module comprises a first switch circuit, an impedance matching circuit and a voltage division circuit; the impedance matching circuit is connected between the input end of the pre-feedback module and the control end of the first switch circuit in series, the voltage division circuit is connected between the first conducting end of the first switch circuit and the feedback end of the driving module in series, and the second conducting end of the first switch circuit is connected with a voltage regulator; the impedance matching circuit is used for matching the voltage of the control end of the first switch circuit, the voltage division circuit is used for configuring the voltage amplitude of the pre-feedback signal, and the first switch circuit is used for providing the pre-feedback signal for maintaining stable output for the driving module when the power supply loop of the load is disconnected under the control of the control signal.
In one embodiment, the first switch circuit comprises a first switch tube, the impedance matching circuit comprises a matching resistor, and the voltage dividing circuit comprises a voltage dividing resistor; the matching resistor is connected between the input end of the front feedback module and the control end of the first switch tube in series, the divider resistor is connected between the first conducting end of the first switch tube and the feedback end of the driving module in series, and the second conducting end of the first switch tube is connected with the voltage regulator.
In one embodiment, the first switch tube is a PNP type triode or a PMOS tube.
In one embodiment, the switch module comprises a second switch tube, a first resistor and a second resistor; a first conduction end of the second switching tube is connected with the load, a second conduction end of the second switching tube is connected with the driving module, a control end of the second switching tube is connected with a first end of the first resistor and a first end of the second resistor, a second end of the first resistor is used for accessing the control signal, and a second end of the second resistor is grounded; the second switch tube is used for being conducted when the control signal is in the first state and being cut off when the control signal is in the first state.
In one embodiment, the second switch tube is an NMOS tube.
In one embodiment, the driving module comprises a constant current driving chip; and a feedback pin of the constant current driving chip is connected with the switch module and the pre-feedback module, an input pin of the constant current driving chip is used for accessing the input voltage, and an output pin of the constant current driving chip is used for outputting the constant current.
In one embodiment, the driving module further comprises a first feedback resistor, a second feedback resistor and a third feedback resistor; the first end of the first feedback resistor is connected with a feedback pin of the constant current driving chip, the second end of the first feedback resistor is connected with the switch module, and the second feedback resistor and the third feedback resistor are connected in parallel and then connected in series between the second end of the first feedback resistor and the ground.
A second aspect of embodiments of the present application provides an electronic device, including the driving circuit provided in the first aspect of embodiments of the present application, wherein the load is a laser light source or an LED light source.
This application compares beneficial effect with traditional technical scheme is: through the arrangement of the front feedback module, when the switch module is not connected with a power supply loop of a load, namely the load stops working and cannot provide a feedback signal to the driving module, the front feedback module provides a front feedback signal to the driving module, so that the driving module can enable the output of the driving module to be maintained within a preset range according to the front feedback signal, and thus when the switch module is connected with the power supply loop of the load, no burr current can be generated in the output of the driving module, and the problem that the driving circuit with feedback generates peak burr current in the moment of load connection due to output feedback hysteresis is solved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic diagram of a driving circuit according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of a driving circuit according to another embodiment of the present disclosure;
fig. 3 is a schematic circuit diagram of a driving circuit according to an embodiment of the present disclosure.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, refer to an orientation or positional relationship illustrated in the drawings for convenience in describing the present application and to simplify description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present application.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
Referring to fig. 1, in a first aspect of the present invention, a driving circuit 10 is provided, where the driving circuit 10 is connected to a load 20 and is used for driving the load 20, and the driving circuit 10 includes a driving module 100, a switching module 200 and a feedback module 300. The driving module 100 is configured to receive an input voltage of the input power VCC and output a constant current to the load 20 according to a feedback signal, where the feedback is a feedback voltage of the driving module 100 to the output of the load 20.
The switch module 200 is connected to the load 20 and the driving module 100, an input end of the switch module 200 is configured to receive a control signal, when the control signal is in a first state, the switch module 200 turns on a power supply loop of the load 20, that is, the load 20 starts to operate, and provides a feedback signal to the driving module 100, and when the control signal is in a second state, the switch module 200 turns off the power supply loop of the load 20, that is, the load 20 stops operating. The feedforward module 300 is connected to the driving module 100, an input end of the feedforward module 300 is configured to access a control signal, output a feedforward signal to the driving module 100 when the control signal is in the second state, and stop outputting the feedforward signal when the control signal is in the first state, where the feedforward signal is configured to maintain an output of the driving module 100 within a preset range when a power supply loop of the load 20 is not turned on.
It can be understood that the control signals received by the input terminal of the switch module 200 and the input terminal of the feedforward module 300 are the same control signal, when the load 20 stops working, the switch module 200 cannot provide the feedback voltage to the driving module 100, that is, the feedback voltage of the driving module 100 is zero, and at this time, the feedforward module 300 may provide a feedforward signal to the driving module 100, so that the output of the driving module 100 is maintained within the preset range.
In the driving circuit 10 provided in the first aspect of the embodiment of the present application, by providing the pre-feedback module 300, when the switch module 200 is not connected to the power supply loop of the load 20, that is, when the load 20 stops working and cannot provide a feedback signal to the driving module 100, the pre-feedback module 300 provides a pre-feedback signal to the driving module 100, so that the driving module 100 can maintain its output within a preset range according to the pre-feedback signal, and thus when the switch module 200 is connected to the power supply loop of the load 20, no spike current occurs in the output of the driving module 100, and the problem that the driving circuit with feedback generates a peak spike current at the moment of connecting the load 20 due to the hysteresis of the output feedback is solved.
In one embodiment, the first state is a high signal state and the second state is a low signal state.
In an embodiment, the voltage amplitude of the feedforward signal is in a range of 0.9-1.1 times of the voltage amplitude of the feedback signal, the voltage amplitude of the feedforward signal provided by the feedforward module 300 to the driving module 100 is consistent with the voltage amplitude of the feedback signal after the switching module 200 switches on the load 20 to start operating, and it can be understood that, in the actual operation of the driving circuit 10, the voltage amplitude of the feedforward signal may not be exactly equal to the voltage amplitude of the feedback signal when the load 20 normally operates, and the voltage amplitude of the feedforward signal may fluctuate to a certain extent, so that the driving module 100 can provide the voltage within a range that the load 20 bears according to the feedforward signal within the range, and the service life of the load 20 is not damaged.
Referring to fig. 2, in an embodiment, the feedforward module 300 includes a first switch circuit 320, an impedance matching circuit 310 and a voltage divider circuit 330. The impedance matching circuit 310 is connected in series between the input terminal of the feedforward module 300 and the control terminal of the first switch circuit 320, the voltage dividing circuit 330 is connected in series between the first conducting terminal of the first switch circuit 320 and the feedback terminal fed of the driving module 100, and the second conducting terminal of the first switch circuit 320 is connected to the voltage regulator VDD. The first switch circuit 320 is configured to provide a feedforward signal for maintaining a stable output to the driving module 100 when a power supply loop of the load 20 is disconnected under control of the control signal, the impedance matching circuit 310 is configured to match a voltage magnitude of a control terminal of the first switch circuit 320, and the voltage dividing circuit 330 is configured to configure a voltage magnitude of the feedforward signal to a feedback terminal fed of the driving module 100, that is, a voltage magnitude of the feedforward signal required by a user may be adjusted by adjusting a resistance value of the voltage dividing circuit 330.
Referring to fig. 3, in an embodiment, the first switch circuit 320 includes a first switch Q1, the impedance matching circuit 310 includes a matching resistor R1, and the voltage divider circuit 330 includes a voltage divider resistor R2.
The matching resistor R1 is connected in series between the input terminal of the feedforward module 300 and the control terminal of the first switch tube Q1, the voltage dividing resistor R2 is connected in series between the first conducting terminal of the first switch tube Q1 and the feedback terminal fed of the driving module 100, and the second conducting terminal of the first switch tube Q1 is connected to the voltage regulator VDD. The matching resistor R1 is configured to stabilize the voltage at the control end of the first switching tube Q1, the first switching tube Q1 is configured to be turned off when the control signal of the input end PWM is a high level signal and to be turned on when the control signal of the input end PWM is a low level signal, and the voltage dividing resistor R2 is configured to configure the voltage amplitude of the feedforward signal, that is, the voltage amplitude of the feedforward signal required by the user can be adjusted by adjusting the resistance of the voltage dividing circuit 330.
Referring to fig. 3, in an embodiment, the first switch Q1 is a PNP transistor. Referring to fig. 3, the base of the first switching tube Q1 is connected to the input terminal of the feedforward module 300 through the matching resistor R1, that is, is used for accessing the control signal of the input terminal PWM, the collector of the first switching tube Q1 is connected to the feedback terminal fed of the driving module 100 through the voltage dividing resistor R2, and the emitter of the first switching tube Q1 is connected to the voltage regulator VDD. In some embodiments, the regulated voltage supply VDD is, for example, 1.8V. It is understood that, in some embodiments, the first switching transistor Q1 may also be a PMOS transistor.
Referring to fig. 3, in an embodiment, the switch module 200 includes a second switch Q2, a first resistor and a second resistor. A first conduction end of the second switch tube Q2 is connected to the load 20, a second conduction end of the second switch tube Q2 is connected to the driving module 100, a control end of the second switch tube Q2 is connected to a first end of the first resistor R3 and to a first end of the second resistor R4, a second end of the first resistor R3 is used for receiving a control signal of the input PWM, and a second end of the second resistor R4 is grounded. The second switch Q2 is used for being turned on when the control signal of the input end PWM is a high level signal and being turned off when the control signal of the input end PWM is a low level signal.
Referring to fig. 3, in an embodiment, the second switch Q2 is an NMOS transistor. Referring to fig. 3, the drain of the second switch Q2 is connected to the cathode of the load 20, the source of the second switch Q2 is connected to the driving module 100, and the gate of the second switch Q2 is connected to the first end of the first resistor R3 and to the first end of the second resistor R4.
It should be noted that, since the second switch tube Q2 is an NMOS tube, when the control signal of the input PWM is a high level signal, it is turned off when the control signal of the input PWM is a low level signal, and the first switch tube Q1 is a PNP type triode, and the first switch tube Q1 is turned off when the control signal of the input PWM is a high level signal, and is turned on when the control signal of the input PWM is a low level signal, so that the switch module 200 and the feedforward module 300 are controlled by the same control signal, when the switch module 200 does not turn on the load 20 to start operating, the first switch tube Q1 of the feedforward module 300 is turned on to provide a feedforward signal to the feedback end fed of the driving module 100, when the switch module 200 turns on, the driving module 100 will not generate a peak glitch current due to no feedback signal at the feedback end fed, and the load 20 starts operating, the feedforward module 300 stops providing the feedforward signal. The same control signal is used to enable the circuit to be controlled more easily, and the switch module 200 and the pre-feedback module 300 are prevented from being controlled by two control signals respectively, so that the circuit conflicts are prevented, and the stability of the circuit is improved.
Referring to fig. 3, in an embodiment, the driving module 100 includes a constant current driving chip 110. The feedback pin FB of the constant current driving chip 110 is connected to the switch module 200 and the pre-feedback module 300, the input pin VIN of the constant current driving chip 110 is used for accessing an input voltage of the input power VCC, and the output pin LX of the constant current driving chip 110 is used for outputting a constant current to drive the load 20.
Referring to fig. 3, in an embodiment, the driving module 100 further includes a first feedback resistor R5, a second feedback resistor R6, and a third feedback resistor R7. The first end of the first feedback resistor R5 is connected to the feedback pin FB of the constant current driving chip 110, the second end of the first feedback resistor R5 is connected to the switch module 200, and the second feedback resistor R6 and the third feedback resistor R7 are connected in parallel and then connected in series between the second end of the first feedback resistor R5 and the ground. The first feedback resistor R5, the second feedback resistor R6 and the third feedback resistor R7 divide the voltage to provide a feedback voltage to the feedback pin FB of the constant current driving chip 110.
Referring to fig. 3, in an embodiment, the driving module 100 further includes an input inductor L1, an input capacitor C1, an output inductor L2, and an output capacitor C3. The input inductor L1 is connected in series between the input terminal VIN of the constant current driving chip 110 and the input power VCC, the input capacitor C1 is connected in series between the input terminal VIN of the constant current driving chip 110 and the ground, the input inductor L1 and the input capacitor C1 are used for stably outputting the input voltage of the constant current driving chip 110, the first end of the output inductor L2 is connected to the output terminal LX of the constant current driving chip 110, the second end of the output inductor L2 is connected to the positive electrode of the load 20, the output capacitor C3 is connected in series between the second end of the output inductor L2 and the ground, the output inductor L2 is used for storing energy and stabilizing the output current, and the output capacitor C3 plays a role in filtering.
Further, referring to fig. 3, the enable pin EN of the constant current driving chip 110 is connected in series with the resistor R9 for receiving an enable signal of the constant current driving chip 110 or receiving a pulse signal DIM for adjusting the magnitude of the output current of the constant current driving chip 110, in an embodiment, the load 20 is a Light Emitting load 20, such as a Light Emitting Diode (LED), a laser, a fluorescent lamp, and the like, and the pulse signal DIM can adjust the brightness of the load 20. A capacitor C5 is also connected in series between the pin BS and the output pin LX of the constant current driving chip 110, and the capacitor C5 is a bootstrap capacitor of the constant current driving chip 110. The capacitor C2 is connected in series between the enable pin EN of the constant current driving chip 110 and the ground, and the capacitor C2 plays a role in filtering. The capacitor C4 is connected in series between the second terminal of the output inductor L2 and ground, and the capacitor C4 performs a filtering function like the output capacitor C3.
In order to better explain the operation principle of the driving circuit 10 provided in the embodiment of the present application, the following description is made in conjunction with the actual operation of the circuit.
Referring to fig. 3, when the control signal of the input PWM is at a low level, the gate of the second switching tube Q2 is at a low level, the second switching tube Q2 is turned off, the load 20 does not work, the feedback pin FB of the constant current driving chip 110 cannot obtain a feedback signal, meanwhile, the emitter of the first switching tube Q1 is connected to the 1.8V regulator VDD, the control signal of the input PWM connected to the base of the first switching tube Q1 is at a low level, the first switching tube Q1 is turned on, the voltage of the regulator VDD is divided by Q1, R2, R5, R6 and R7 to form a pre-feedback signal at the feedback pin FB of the constant current driving chip 110, and the pre-feedback signal can be consistent with the feedback signal when the load 20 normally works by adjusting the resistance of R2, and the voltage output by the driving chip 110 at this time is also matched with the load 20 due to the existence of the pre-feedback signal, when the control signal of the PWM input is at a high level, the second switch Q2 is turned on, the load 20 starts to work, the feedback pin FB of the constant current driver chip 110 obtains a normal feedback signal, and meanwhile, the first switch Q1 is turned off, and the feedforward module 300 stops outputting the feedforward signal. Before and after the second switching tube Q2 is switched on, the output voltage of the constant current driving chip 110 is always matched with the load 20, and the driving module 100 does not generate peak spike current because the feedback end fed of the driving module has no feedback signal, so that the driving module 100 provides voltage within the bearing range of the load 20, the service life of the load 20 is not damaged, the service life and the reliability of the load 20 are improved, and the impact on an external power supply system is reduced.
In the driving circuit 10 provided in the first aspect of the embodiment of the present application, by providing the pre-feedback module 300, when the switch module 200 is not connected to the power supply loop of the load 20, that is, when the load 20 stops working and cannot provide a feedback signal to the driving module 100, the pre-feedback module 300 provides a pre-feedback signal to the driving module 100, so that the driving module 100 can maintain its output within a preset range according to the pre-feedback signal, and thus when the switch module 200 is connected to the power supply loop of the load 20, no spike current occurs in the output of the driving module 100, and the problem that the driving circuit with feedback generates a peak spike current at the moment of connecting the load 20 due to the hysteresis of the output feedback is solved.
A second aspect of the embodiments of the present application provides an electronic device, which includes the driving circuit 10 provided in the first aspect of the embodiments of the present application, wherein the load 20 is a laser light source or an LED light source. In some embodiments, load 20 is a Vertical Cavity Surface Emitting Laser (VCSEL).
The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.

Claims (10)

1. A driver circuit, comprising:
the driving module is used for accessing input voltage and outputting constant current to a load according to a feedback signal;
the switch module is connected with the load and the driving module, the input end of the switch module is used for accessing a control signal, the switch module is used for switching on a power supply loop of the load when the control signal is in a first state, providing the feedback signal to the driving module, and switching off the power supply loop of the load when the control signal is in a second state; and
the input end of the pre-feedback module is used for accessing the control signal, outputting a pre-feedback signal to the driving module when the control signal is in a second state, and stopping outputting the pre-feedback signal when the control signal is in a first state;
the driving module is further used for maintaining the output of the load within a preset range according to the pre-feedback signal when a power supply loop of the load is not switched on.
2. The drive circuit of claim 1, wherein the voltage amplitude of the feedforward signal is in the range of 0.9 to 1.1 times the voltage amplitude of the feedback signal.
3. The drive circuit of claim 1, wherein the pre-feedback module comprises a first switching circuit, an impedance matching circuit, and a voltage divider circuit;
the impedance matching circuit is connected between the input end of the pre-feedback module and the control end of the first switch circuit in series, the voltage division circuit is connected between the first conducting end of the first switch circuit and the feedback end of the driving module in series, and the second conducting end of the first switch circuit is connected with a voltage regulator;
the impedance matching circuit is used for matching the voltage of the control end of the first switch circuit, the voltage dividing circuit is used for configuring the voltage amplitude of the pre-feedback signal, and the first switch circuit is used for providing the pre-feedback signal for maintaining stable output for the driving module when the power supply loop of the load is disconnected under the control of the control signal.
4. The driving circuit of claim 3, wherein the first switching circuit comprises a first switching tube, the impedance matching circuit comprises a matching resistor, and the voltage dividing circuit comprises a voltage dividing resistor;
the matching resistor is connected between the input end of the front feedback module and the control end of the first switch tube in series, the divider resistor is connected between the first conducting end of the first switch tube and the feedback end of the driving module in series, and the second conducting end of the first switch tube is connected with the voltage regulator.
5. The driving circuit as claimed in claim 4, wherein the first switch tube is a PNP type triode or a PMOS tube.
6. The driving circuit of claim 1, wherein the switching module comprises a second switching tube, a first resistor and a second resistor;
a first conduction end of the second switching tube is connected with the load, a second conduction end of the second switching tube is connected with the driving module, a control end of the second switching tube is connected with a first end of the first resistor and a first end of the second resistor, a second end of the first resistor is used for accessing the control signal, and a second end of the second resistor is grounded;
the second switch tube is used for being conducted when the control signal is in the first state and being cut off when the control signal is in the first state.
7. The driving circuit as claimed in claim 6, wherein the second switch tube is an NMOS tube.
8. The drive circuit according to any one of claims 1 to 7, wherein the drive module includes a constant current drive chip;
and a feedback pin of the constant current driving chip is connected with the switch module and the pre-feedback module, an input pin of the constant current driving chip is used for accessing the input voltage, and an output pin of the constant current driving chip is used for outputting the constant current.
9. The drive circuit of claim 8, wherein the drive module further comprises a first feedback resistor, a second feedback resistor, and a third feedback resistor;
the first end of the first feedback resistor is connected with a feedback pin of the constant current driving chip, the second end of the first feedback resistor is connected with the switch module, and the second feedback resistor and the third feedback resistor are connected in parallel and then connected in series between the second end of the first feedback resistor and the ground.
10. An electronic device comprising the drive circuit according to any one of claims 1 to 9, wherein the load is a laser light source or an LED light source.
CN202210751466.XA 2022-06-29 2022-06-29 Drive circuit and electronic device Pending CN115087168A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210751466.XA CN115087168A (en) 2022-06-29 2022-06-29 Drive circuit and electronic device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210751466.XA CN115087168A (en) 2022-06-29 2022-06-29 Drive circuit and electronic device

Publications (1)

Publication Number Publication Date
CN115087168A true CN115087168A (en) 2022-09-20

Family

ID=83255443

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202210751466.XA Pending CN115087168A (en) 2022-06-29 2022-06-29 Drive circuit and electronic device

Country Status (1)

Country Link
CN (1) CN115087168A (en)

Similar Documents

Publication Publication Date Title
CN111670609B (en) Light emitting element drive control device and light emitting element drive circuit device
US5041739A (en) Substrate potential generating circuit
US11362646B1 (en) Variable current drive for isolated gate drivers
US7675240B2 (en) Light emitting diode circuit having even current
US20230275397A1 (en) Pulsed laser diode driver
US20220182004A1 (en) Updating control parameters of a gate driver during operation
CN114499181B (en) Drive circuit, light emitting circuit and display device
US20210273470A1 (en) Driving circuit for switch and battery control circuit using the same
US11768276B2 (en) Laser emitting circuit and lidar
TW201926868A (en) Voltage compensation circuit of power converter
CN112805587A (en) Laser emission circuit and laser radar
US20070018194A1 (en) Driving circuit
EP3592117B1 (en) Protective circuit and led driving circuit
CN115087168A (en) Drive circuit and electronic device
US10548190B1 (en) Negative voltage rail
CN111130321A (en) Single-power-supply negative-voltage power switch tube driving circuit
CN217693775U (en) Current-limiting constant current circuit composed of discrete devices
US20210313823A1 (en) Charging device supporting power delivery
CN210518926U (en) Drive circuit for optical communication
CN107302303B (en) Control circuit for reducing output voltage ripple, driving power supply and television
CN211352536U (en) Constant current load circuit, backlight adjusting circuit, driving board card and electronic equipment
CN110690893A (en) High-frequency driving system
KR100303439B1 (en) Rush Current Reduction Circuit and Switching Mode Power Supply Using It
CN215576338U (en) Analog controller
CN112996184B (en) Solid-state light source dimming control circuit and projector applying same

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination