CN215647490U

CN215647490U - Current regulating circuit and LED driving power supply

Info

Publication number: CN215647490U
Application number: CN202121019657.4U
Authority: CN
Inventors: 雷显灿
Original assignee: SHENZHEN LONGYUN LIGHTING ELECTRIC APPLIANCES CO Ltd
Current assignee: SHENZHEN LONGYUN LIGHTING ELECTRIC APPLIANCES CO Ltd
Priority date: 2021-05-13
Filing date: 2021-05-13
Publication date: 2022-01-25
Anticipated expiration: 2031-05-13

Abstract

The utility model discloses a current regulating circuit and an LED driving power supply, wherein the current regulating circuit is connected with an LED driver, the current regulating circuit comprises a voltage division module and a regulating module, and the LED driver comprises a dimming pin; the voltage division module is connected with the dimming pin and is used for dividing the voltage of the dimming pin; the adjusting module is connected with the voltage dividing module and used for adjusting the voltage dividing proportion of the voltage dividing module so as to adjust the voltage of the dimming pin; according to the utility model, the voltage division ratio of the voltage division module is adjusted through the switch module, so that the output current of the LED driver can be effectively adjusted, the same LED driver can be configured with various different output currents, and the types of LED driving are effectively reduced.

Description

Current regulating circuit and LED driving power supply

Technical Field

The utility model relates to the technical field of LEDs, in particular to a current regulating circuit and an LED driving power supply.

Background

At present, the development of LED illumination is rapidly advanced, and an LED light source does not have a standard pattern similar to a fluorescent tube, so that the appearance structure of an LED lamp is various. The LED light sources are combined with various different voltages or currents, the LED lamp market is enriched, meanwhile, the LED driving is diversified, and the production difficulty and the inventory pressure of enterprises are increased. Great demands are made on the types of LED driving, but the existing LED driving power supply cannot realize multiple output currents in the same driving configuration, so that the application scenarios of the LED light source are limited.

Thus, the prior art has yet to be improved and enhanced.

SUMMERY OF THE UTILITY MODEL

In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a current regulation circuit and an LED driving power supply, which can effectively solve the problem that a plurality of output currents are configured in the same driver, thereby effectively reducing the types of LED driving.

In order to achieve the purpose, the utility model adopts the following technical scheme:

a current regulation circuit is connected with an LED driver, the current regulation circuit comprises a voltage division module and a regulation module, and the LED driver comprises a dimming pin;

the voltage division module is connected with the dimming pin and is used for dividing the voltage of the dimming pin;

the adjusting module is connected with the voltage dividing module and used for adjusting the voltage dividing proportion of the voltage dividing module so as to adjust the voltage of the dimming pin.

In the current adjusting circuit, the voltage dividing module comprises a plurality of voltage dividing resistors connected in parallel, one end of each voltage dividing resistor is connected with the dimming pin, and the other end of each voltage dividing resistor is connected with the adjusting module.

In the current regulating circuit, the regulating module comprises a plurality of switches which are in one-to-one correspondence with the voltage dividing resistors; one end of each switch is connected with the other end of the corresponding divider resistor, and the other end of each switch is grounded.

In the current regulating circuit, the switch is a dial switch.

An LED driving power supply comprises an LED driver, an LED lamp string and the current regulating circuit; the LED driver is respectively connected with the LED lamp string and the current regulating circuit.

In the LED driving power supply, the LED driver comprises a driving chip and a switch module, the driving chip is connected with the switch module, and the switch module is also connected with the LED lamp string; the driving chip is used for outputting a switching-on signal or a switching-off signal to the switch module according to the dimming signal and controlling the switch module to provide current for the LED lamp string; the switch module is used for being switched on according to the conducting signal or being switched off according to the disconnecting signal.

In the LED driving power supply, the switch module comprises a resistor, an inductor, a switch tube, a diode and a capacitor; one end of the resistor is connected with the first end of the switch tube and the 6 th pin of the driving chip, the other end of the resistor is grounded, the second end of the switch tube is connected with the 7 th pin of the driving chip, the third end of the switch tube is connected with one end of the inductor and the anode of the diode, the cathode of the diode is connected with the anode of the LED lamp string and one end of the capacitor, and the other end of the inductor and the other end of the capacitor are connected with the cathode of the LED lamp string.

In the LED driving power supply, the switch tube comprises an MOS tube, the first end of the switch tube is the source electrode of the MOS tube, the second end of the switch tube is the grid electrode of the MOS tube, and the third end of the switch tube is the drain electrode of the MOS tube.

Compared with the prior art, the current regulating circuit and the LED driving power supply are provided by the utility model, the current regulating circuit is connected with the LED driver, the current regulating circuit comprises a voltage division module and a regulating module, and the LED driver comprises a dimming pin; the voltage division module is connected with the dimming pin and is used for dividing the voltage of the dimming pin; the adjusting module is connected with the voltage dividing module and used for adjusting the voltage dividing proportion of the voltage dividing module so as to adjust the voltage of the dimming pin; according to the utility model, the voltage division ratio of the voltage division module is adjusted through the switch module, so that the output current of the LED driver can be effectively adjusted, the same LED driver can be configured with various different output currents, and the types of LED driving are effectively reduced.

Drawings

Fig. 1 is a block diagram of an LED driving power supply provided by the present invention;

FIG. 2 is a schematic circuit diagram of a current regulation circuit in the LED driving power supply according to the present invention;

fig. 3 is a schematic circuit diagram of a first embodiment of a current regulating circuit in an LED driving power supply according to the present invention.

FIG. 4 is a schematic circuit diagram of an LED driver in the LED driving power supply provided by the present invention;

fig. 5 is a diagram illustrating a relationship between a voltage of a dimming pin and an output current of the LED driving power supply according to the present invention.

Detailed Description

The utility model provides a current regulating circuit and an LED driving power supply, which can effectively solve the problem that the same driver is configured with various output currents.

In order to make the objects, technical solutions and effects of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.

Referring to fig. 1, the LED driving power supply provided by the present invention includes an LED driver 20, an LED string 10 and a current regulating circuit 30; the LED driver 20 is connected to the LED string 10 and the current adjusting circuit 30, wherein the LED driver 20 is configured to control on/off of the LED string 10, and the current adjusting circuit 30 is configured to adjust an output current of the LED driver 20 when the LED driver 20 controls the LED string 10 to be turned on, so as to configure different currents for the LED string 10, and effectively reduce types of LED driving.

In specific implementation, the current adjusting circuit 30 includes a voltage dividing module 31 and an adjusting module 32, the LED driver 20 includes a dimming pin, and the voltage dividing module 31 is connected to the dimming pin and configured to divide a voltage of the dimming pin; the adjusting module 32 is connected to the voltage dividing module 31, and is configured to adjust a voltage dividing ratio of the voltage dividing module 31 to adjust a voltage of the dimming pin; in the utility model, the voltage of the dimming pin is divided by the voltage dividing module 31, and the divided voltage is adjusted by the adjusting module 32 correspondingly, so that the voltage of the dimming pin, that is, the output current of the LED driver 20 is adjusted, and the effect of configuring various different output currents is achieved.

Further, referring to fig. 2, the voltage dividing module 31 includes a plurality of voltage dividing resistors connected in parallel, which are R01, R02, … … and R0M, one end of each voltage dividing resistor is connected to the dimming pin, and the other end of each voltage dividing resistor is connected to the adjusting module 32; in this embodiment, the output current of the dimming pin can be effectively adjusted by setting the voltage dividing resistor with a pull-down function at the dimming pin.

Further, the adjusting module 32 includes a plurality of switches respectively K1, K2, … …, and KX corresponding to the voltage dividing resistors one to one; one end of each switch is connected with the other end of the corresponding divider resistor, and the other end of each switch is grounded; in this embodiment, the switch is a dial switch, and when the dial switch is turned on, the divider resistors connected to the dial switch become the access circuits, so that the number of the divider resistor access circuits can be set by setting the switching state of each dial switch, and the function of adjusting the voltage division ratio of the voltage division module 31 is sequentially realized, so as to subsequently adjust the output current of the LED driver 20.

For easy understanding, please refer to fig. 3, in this embodiment, the operation process of the current regulating circuit 30 is described by taking two voltage dividing resistors and two dial switches as an example; that is, in the first embodiment of the present invention, the two voltage dividing resistors are R01 and R02, the dial switches connected to the two voltage dividing resistors in a one-to-one correspondence are K1 and K2, the dial switch K controls whether the voltage dividing resistor R01 is connected to the circuit, and the dial switch K2 controls whether the voltage dividing resistor R02 is connected to the circuit, wherein a filter resistor R00 is disposed in the interface corresponding to the dimming pin; when the dial switches K1 and K2 are both turned off, the output current of the LED driver 20 is an initial current, which is at most I0; when the dial switch K1 is turned on and K2 is turned off, the output current of the LED driver 20 is I1 — I0 × R01/(R00+ R01), where R01 and R00 correspond to the resistances of the voltage dividing resistor R01 and the filter resistor R00, respectively, and the magnitude of the current I1 can be adjusted by setting the resistance of the voltage dividing resistor R01; when the dial switch K1 is turned off and K2 is turned on, the output current of the LED driver 20 is I2 — I0 × R02/(R00+ R02), where R02 is the resistance of the voltage dividing resistor R02, and the magnitude of the current I2 can be adjusted by setting the resistance of the voltage dividing resistor R02; when the dial switches K1 and K2 are both turned on, and both voltage dividing resistors are connected to the circuit, the output current I3 of the LED driver 20 is I0 × R01R02/(R01+ R02)/(R00+ R01R02/(R01+ R02)), and the magnitude of the current I3 can be adjusted by setting the resistance values of the voltage dividing resistors R01 and R02; therefore, the configuration of four currents can be realized by setting two voltage dividing resistors and two dial switches, so that the corresponding LED driver 20 can configure the LED lamp strings 10 with four different output current requirements, and if various current configurations are required, the configuration can be realized according to the number of the voltage dividing resistors and the dial switches. The utility model can realize the configuration of various currents through a plurality of voltage dividing resistors and dial switches, effectively reduces the configuration types of the LED driver 20 and reduces the production cost.

Further, referring to fig. 1 and fig. 4, the LED driver 20 includes a driving chip 21 and a switch module 22, the driving chip 21 is connected to the switch module 22, and the switch module 22 is further connected to the LED string 10; the driving chip 21 is configured to output a turn-on signal or a turn-off signal to the switch module 22 according to the dimming signal, and control the switch module 22 to provide current for the LED light string 10; the switch module 22 is configured to be turned on according to the on signal or turned off according to the off signal; the model of the driving chip 21 in this embodiment is BP2879, wherein the dimming pin of the LED driver 20 is also the DIM pin of the driving chip 21; the output current of the driving chip can receive a signal of a DIM pin to perform analog dimming, the DIM pin is suspended when the driving chip is not dimmed, the maximum level of the DIM pin is controlled to be 1.8V inside the driving chip, and specifically, the relationship between the voltage of the DIM pin and the output current Iout is shown in FIG. 5; the switch module 22 is controlled to be switched on or switched off by the driving chip 21 according to an external dimming signal, so that the on/off of the LED lamp string 10 is effectively controlled, and when the driving chip 21 controls the LED lamp string 10 to be switched on, the dimming pin is connected with the current adjusting circuit 30, so that the output current can be effectively adjusted, the same LED driver 20 can be configured with various different output currents, the LED lamp strings 10 with various different currents are further configured, the configuration types of the LED driver 20 are effectively reduced, and the production cost is reduced.

Further, the switch module 22 includes a resistor R1, an inductor N1, a switch transistor Q1, a diode D1, and a capacitor C1; one end of the resistor R1 is connected to the first end of the switch Q1 and the 6 th pin of the driver chip 21, the other end of the resistor R1 is grounded, the second end of the switch Q1 is connected to the 7 th pin of the driver chip 21, the third end of the switch Q1 is connected to one end of the inductor N1 and the anode of the diode D1, the cathode of the diode D1 is connected to the anode of the LED light string 10 and one end of the capacitor C1, the other end of the inductor N1 and the other end of the capacitor C1 are both connected to the cathode of the LED light string 10, in this embodiment, the switch Q1 is an MOS transistor, the switch Q1 includes an MOS transistor, the first end of the switch Q1 is a source of the MOS transistor, the second end of the switch Q1 is a gate of the MOS transistor, the third end of the switch Q1 is a drain of the MOS transistor, and the driver chip 21 is turned on or turned off by controlling the MOS transistor, the control of the on and off of the LED lamp string 10 can be effectively realized.

The present invention also provides a current regulating circuit, which is not described in detail herein since the current regulating circuit is described in detail above.

In summary, according to the current regulation circuit and the LED driving power supply provided by the present invention, the current regulation circuit is connected to the LED driver, the current regulation circuit includes a voltage division module and a regulation module, and the LED driver includes a dimming pin; the voltage division module is connected with the dimming pin and is used for dividing the voltage of the dimming pin; the adjusting module is connected with the voltage dividing module and used for adjusting the voltage dividing proportion of the voltage dividing module so as to adjust the voltage of the dimming pin; according to the utility model, the voltage division ratio of the voltage division module is adjusted through the switch module, so that the output current of the LED driver can be effectively adjusted, the same LED driver can be configured with various different output currents, and the types of LED driving are effectively reduced.

It should be understood that the technical solutions and the inventive concepts according to the present invention may be equally replaced or changed by those skilled in the art, and all such changes or substitutions should fall within the protection scope of the appended claims.

Claims

1. A current regulation circuit is connected with an LED driver, and is characterized in that the current regulation circuit comprises a voltage division module and a regulation module, and the LED driver comprises a dimming pin;

2. The circuit of claim 1, wherein the voltage divider module comprises a plurality of voltage divider resistors connected in parallel, one end of each of the voltage divider resistors is connected to the dimming pin, and the other end of each of the voltage divider resistors is connected to the adjustment module.

3. The current regulating circuit according to claim 2, wherein the regulating module comprises a plurality of switches in one-to-one correspondence with the voltage dividing resistors; one end of each switch is connected with the other end of the corresponding divider resistor, and the other end of each switch is grounded.

4. The current regulating circuit of claim 3, wherein the switch is a dip switch.

5. An LED driving power supply, comprising an LED driver, an LED string and a current regulating circuit according to any one of claims 1 to 4; the LED driver is respectively connected with the LED lamp string and the current regulating circuit.

6. The LED driving power supply according to claim 5, wherein the LED driver comprises a driving chip and a switch module, the driving chip is connected with the switch module, and the switch module is further connected with the LED lamp string; the driving chip is used for outputting a switching-on signal or a switching-off signal to the switch module according to the dimming signal and controlling the switch module to provide current for the LED lamp string; the switch module is used for being switched on according to the conducting signal or being switched off according to the disconnecting signal.

7. The LED driving power supply according to claim 6, wherein the switch module comprises a resistor, an inductor, a switch tube, a diode and a capacitor; one end of the resistor is connected with the first end of the switch tube and the 6 th pin of the driving chip, the other end of the resistor is grounded, the second end of the switch tube is connected with the 7 th pin of the driving chip, the third end of the switch tube is connected with one end of the inductor and the anode of the diode, the cathode of the diode is connected with the anode of the LED lamp string and one end of the capacitor, and the other end of the inductor and the other end of the capacitor are connected with the cathode of the LED lamp string.

8. The LED driving power supply according to claim 7, wherein the switching tube comprises an MOS tube, the first end of the switching tube is a source electrode of the MOS tube, the second end of the switching tube is a gate electrode of the MOS tube, and the third end of the switching tube is a drain electrode of the MOS tube.