CN215912255U

CN215912255U - Drive signal amplification circuit and lamp

Info

Publication number: CN215912255U
Application number: CN202122283988.5U
Authority: CN
Inventors: 古念松; 冉成斌; 张才富
Original assignee: NVC Lighting Technology Corp
Current assignee: NVC Lighting Technology Corp
Priority date: 2021-09-18
Filing date: 2021-09-18
Publication date: 2022-02-25
Anticipated expiration: 2031-09-18

Abstract

The application discloses a driving signal amplifying circuit and a lamp, wherein the circuit comprises a driving IC (integrated circuit), and the driving IC comprises at least one signal driving end, and the signal driving end is used for outputting a PWM (pulse width modulation) driving signal; the signal amplification module comprises a first MOS tube, a second MOS tube, a half-bridge driving sub-circuit and a third MOS tube; the grid electrode of the first MOS tube is connected with the signal driving end, and the source electrode and the drain electrode are connected between a power supply end and a grounding end; the grid electrode of the second MOS tube is connected between a power supply end and the drain electrode of the first MOS tube; the control end of the half-bridge drive sub-circuit is connected between a power supply end and the drain electrodes of the first MOS tube and the second MOS tube, and the output end of the half-bridge drive sub-circuit is connected with the grid electrode of the third MOS tube; and the source electrode and the drain electrode of the third MOS tube are connected between the driving end and the grounding end. The embodiment of the application can solve the problem that the PWM driving signal driving capability of part of the driving ICs is insufficient, improves the universality of the driving ICs and the rear-stage MOS switch, and further reduces the cost of components.

Description

Drive signal amplification circuit and lamp

Technical Field

The application relates to the field of lamp illumination, in particular to a driving signal amplifying circuit and a lamp.

Background

LED lighting fixtures are a tool that our daily lives use to illuminate. The LED lamp needs to drive the IC to output a PWM signal to control the lighting effect of the LED in the working process. In the existing LED lamp product, a PWM signal of a general driver IC is directly connected to a MOS switch at a subsequent stage to drive the MOS switch for on-off control.

However, part of integrated ICs (such as an MCU, a color temperature switching IC, a control IC, etc.) used by a power supply in an LED lamp at present has limited driving capability, and the output PWM signal voltage is low and cannot reach the turn-on voltage of a mainstream MOS transistor in the market, so that a specific type of driving IC and an MOS switch need to be selected for matching, otherwise, the MOS switch at the rear stage may not be normally turned on, and the problem related to driving failure of the lamp is likely to occur.

Therefore, the universality of the existing driving component is low, and the cost of the component is improved.

SUMMERY OF THE UTILITY MODEL

The application provides a drive signal amplifier circuit and lamps and lanterns can improve drive signal amplification effect, and then improves the commonality of drive components and parts.

The application discloses a drive signal amplifying circuit, which comprises a drive IC, a signal amplifying module and a drive end,

the driving IC comprises at least one signal driving end, and the signal driving end is used for outputting a PWM driving signal;

the signal amplification module comprises a first MOS tube, a second MOS tube, a half-bridge drive sub-circuit and a third MOS tube;

the grid electrode of the first MOS tube is connected with the signal driving end, and the source electrode and the drain electrode are connected between a power supply end and a grounding end;

the grid electrode of the second MOS tube is connected between the power supply end and the drain electrode of the first MOS tube, and the source electrode and the drain electrode of the second MOS tube are connected in parallel with the source electrode and the drain electrode of the first MOS tube;

the control end of the half-bridge drive sub-circuit is connected between the power supply end and the drain electrodes of the first MOS tube and the second MOS tube, and the output end of the half-bridge drive sub-circuit is connected with the grid electrode of the third MOS tube;

and the source electrode and the drain electrode of the third MOS tube are connected between the driving end and the grounding end.

In an embodiment, the first MOS transistor and the second MOS transistor both employ N-channel MOS transistors.

In one embodiment, the half-bridge driving sub-circuit further comprises a diode, wherein the anode of the diode is connected with the power supply end, and the cathode of the diode is connected with the control end of the half-bridge driving sub-circuit.

In one embodiment, a first voltage dividing resistor is disposed between the cathode of the diode and the control terminal of the half-bridge driving sub-circuit.

In an embodiment, the signal driving terminal of the driving IC is synchronized with a signal phase of the control terminal of the third MOS transistor.

In one embodiment, a second voltage-dividing resistor is arranged between the power supply end and the drain of the first MOS transistor;

a third voltage dividing resistor is arranged between the power supply end and the drain electrode of the second MOS tube;

the grid electrode of the second MOS tube is connected between the first voltage dividing resistor and the drain electrode of the first MOS tube.

In an embodiment, the second voltage-dividing resistor is connected to the drain of the first MOS transistor through a fourth voltage-dividing resistor.

The application also discloses a lamp which comprises an LED light source and a driving signal amplifying circuit which is connected with the LED light source and drives the LED light source to work;

wherein the drive signal amplification circuit is the drive signal amplification circuit as described in any one of the above.

By the above, in the drive signal amplification circuit and the lamp, the first MOS transistor, the second MOS transistor and the half-bridge drive sub-circuit are connected and matched, so that the PWM drive signal output by the drive IC can be amplified by using lower hardware cost, the situation that the drive capability of the PWM drive signal of part of the drive IC is insufficient is solved, the universality of the drive IC and the rear-stage MOS switch is improved, and the cost of components is reduced.

Drawings

Fig. 1 is a schematic structural diagram of a driving signal amplifying circuit according to an embodiment of the present disclosure.

Fig. 2 is a schematic structural diagram of a lamp provided in the embodiment of the present application.

Detailed Description

The following detailed description of the preferred embodiments of the present application, taken in conjunction with the accompanying drawings, will make the advantages and features of the present application more readily appreciated by those skilled in the art, and thus will more clearly define the scope of the invention. In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

Referring to fig. 1, fig. 1 illustrates a structure of a lamp with a replaceable lampshade provided in an embodiment of the present application.

As shown in fig. 1, the present application discloses a driving signal amplifying circuit including a driving IC, a signal amplifying module, and a driving terminal V-.

The driving IC comprises at least one signal driving terminal OUT1, and the signal driving terminal OUT1 is used for outputting a PWM driving signal. The driver IC may be an MCU (micro controller Unit), a color temperature switching IC in an LED lamp, or a control IC that can control other controllable components, and the present application is not limited thereto.

The signal amplification module comprises a first MOS tube Q1, a second MOS tube Q2, a half-bridge driving sub-circuit and a third MOS tube Q5.

The gate of the first MOS transistor Q1 is connected to the signal driving terminal OUT1 of the driving IC, and the source and the drain are connected between the power terminal and the ground terminal. The gate of the second MOS transistor Q2 is connected between the power source terminal and the drain of the first MOS transistor Q1, and the source and drain of the second MOS transistor Q2 are connected in parallel with the source and drain of the first MOS transistor Q1. Specifically, the source of the second MOS transistor Q2 is connected to the source of the first MOS transistor Q1, the drain of the second MOS transistor Q2 is connected to the drain of the first MOS transistor Q1, and the second MOS transistor Q2 is controlled by the first MOS transistor Q1 to be turned on or off.

Thereby realize the amplification to drive signal through the cooperation of first MOS pipe Q1 and second MOS pipe Q2, and adopt the MOS pipe can improve PWM drive signal's transmission reliability.

In an embodiment, the first MOS transistor Q1 and the second MOS transistor Q2 both use N-channel MOS transistors, so that devices of uniform type can be used, and the cost is further reduced.

Specifically, a second voltage-dividing resistor R2 is provided between the power supply terminal and the drain of the first MOS transistor Q1, a third voltage-dividing resistor R3 is provided between the power supply terminal and the drain of the second MOS transistor Q2, and the gate of the second MOS transistor Q2 is connected between the first voltage-dividing resistor R1 and the drain of the first MOS transistor Q1. Furthermore, the second voltage-dividing resistor R2 is connected to the drain of the first MOS transistor Q1 through a fourth voltage-dividing resistor R4 and the gate of the second MOS transistor Q2. By providing the voltage dividing resistor and the connection method, the operational reliability between the first MOS transistor Q1 and the second MOS transistor Q2 can be improved.

The control end of the half-bridge drive sub-circuit is connected between a power supply end and the drain electrodes of the first MOS tube Q1 and the second MOS tube Q2, and the output end of the half-bridge drive sub-circuit is connected with the grid electrode of the third MOS tube Q5; the source and drain of the third MOS transistor Q5 are connected between the driving terminal V-and ground. The drain of the third MOS transistor Q5 is connected to the driving terminal V-, and the drain of the third MOS transistor Q5 is connected to the ground terminal, for driving the lower stage circuit to operate.

Specifically, the half-bridge driving sub-circuit is composed of a first transistor Q3 and a second transistor Q4, so as to achieve the effect of signal amplification. The collector of the first triode Q3 is connected to the power supply terminal, the emitter of the first triode Q3 is connected to the emitter of the second triode Q4, and the base of the first triode Q3 is connected between the second MOS transistor Q2 and the power supply terminal.

In order to improve the signal transmission reliability of the circuit, the driving signal amplifying circuit further comprises a diode, wherein the anode of the diode is connected with a power supply end, and the cathode of the diode is connected with the control end of the half-bridge driving sub-circuit. In an embodiment, with reference to fig. 1, the anode of the diode may be connected between the third voltage dividing resistor R3 and the drain of the second MOS transistor Q2, and a first voltage dividing resistor R1 is disposed between the cathode of the diode and the control terminal of the half-bridge driving sub-circuit. In another embodiment, the diode may be replaced by a resistor, i.e. a resistor is connected between the supply terminal and the half-bridge driver sub-circuit.

Of course, the specific use of the diode or the resistor, and the specific parameters of the diode and the resistor can be set according to the actual situation.

During the operation of the driving signal amplifying circuit, the signal driving terminal OUT1 of the driving IC outputs a PWM driving signal, which has a relatively low voltage amplitude. When the PWM driving signal is at a high level, the first MOS transistor Q1 is turned on, and the second MOS transistor Q2 is turned off. During this time, the first transistor Q3 of the half-bridge driving sub-circuit is turned on, the second transistor Q4 is turned off, and the third MOS transistor Q5 is driven to be turned on. When the potential of the PWM driving signal is low, the first MOS transistor Q1 is turned off, and the second MOS transistor Q2 is turned on. During this period, the first transistor Q3 of the half-bridge driving sub-circuit is turned off, the second transistor Q4 is turned on, and the third MOS transistor Q5 is driven to be turned off.

The above control mode makes the phase of the signal output by the output terminal OUT2 of the half-bridge driving sub-circuit and the phase of the signal of the PWM driving signal output by the signal driving terminal OUT1 of the driving IC synchronized, and inputs the synchronized signal to the control terminal of the third MOS transistor Q5. The phase of the signal output by the third MOS transistor Q5 is also driven by the half-bridge driving sub-circuit to be synchronous with the phase of the signal of the PWM driving signal output by the signal driving terminal OUT1 of the driving IC, so that the synchronous amplification effect of the PWM driving signal is realized.

It should be noted that, the specific hardware model and parameters of the components in the driving signal amplification circuit need to be set according to the actual application process, and the hardware model and parameters of the components are not limited in the present application.

From the above, the drive signal amplification circuit of this application, through the cooperation of being connected between first MOS pipe Q1, second MOS pipe Q2 and the half-bridge drive sub-circuit for can utilize lower hardware cost to carry out signal amplification to the PWM drive signal that drive IC exported, solve the not enough condition of partial drive IC's PWM drive signal driving capability, improve the commonality of drive IC and back level MOS switch, and then reduced the cost of components and parts.

Referring to fig. 2, a structure of a lamp provided in an embodiment of the present application is shown.

As shown in fig. 2, the lamp includes an LED light source and a driving signal amplifying circuit connected to the LED light source and driving the LED light source. For avoiding redundancy, the driving signal amplifying circuit is the driving signal amplifying circuit described in any one of the above items.

The number of the LED light sources can be 1 or more than 1, and the LED light sources are driven by a driving board comprising a driving signal amplifying circuit. The driver Board may further include functional modules such as a power supply Circuit and a color temperature control Circuit, and may be implemented by using a PCB (Printed Circuit Board) or an FPC (Flexible Printed Circuit Board). In addition, the lamp can also comprise external structural components such as a shell, and the specific implementation scheme of the driving board and the functional module contained in the driving board can be determined according to the actual product function.

When the lamp is applied to the driving signal amplifying circuit in any one of the embodiments, the universality of the driving IC and the rear stage MOS switch can be improved, and the hardware cost of the driving signal amplifying circuit and the whole lamp can be further reduced.

The embodiments of the present application have been described in detail with reference to the drawings, but the present application is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present application within the knowledge of those skilled in the art.

Claims

1. A driving signal amplifying circuit is characterized by comprising a driving IC, a signal amplifying module and a driving end,

2. The driving signal amplifying circuit according to claim 1, wherein the first MOS transistor and the second MOS transistor are both N-channel MOS transistors.

3. The drive signal amplification circuit of claim 1 further comprising a diode, an anode of the diode being connected to the power supply terminal, and a cathode of the diode being connected to the control terminal of the half-bridge drive sub-circuit.

4. The driving signal amplifying circuit of claim 3, wherein a first voltage dividing resistor is provided between the cathode of the diode and the control terminal of the half-bridge driving sub-circuit.

5. The driving signal amplifying circuit according to claim 1, wherein the signal driving terminal of the driving IC is phase-synchronized with the signal of the control terminal of the third MOS transistor.

6. The drive signal amplification circuit of claim 4, wherein:

a second voltage-dividing resistor is arranged between the power supply end and the drain electrode of the first MOS tube;

7. The driving signal amplifying circuit according to claim 6, wherein the second voltage dividing resistor is connected to the gate of the second MOS transistor through a fourth voltage dividing resistor.

8. A lamp is characterized by comprising an LED light source and a driving signal amplifying circuit which is connected with the LED light source and drives the LED light source to work;

wherein the drive signal amplification circuit is the drive signal amplification circuit according to any one of claims 1 to 7.