Constant current control LED power supply

Abstract

The utility model discloses a constant current control LED power supply, which relates to the technical field of LED power supplies, and comprises a power supply module used for electric energy processing and power supply; the power supply detection module is used for detecting the power supply state of the power module; the constant-current driving module is used for performing constant-current driving control on the LED module when receiving the feedback signal output by the signal transmission module; the driving detection module is used for judging whether the constant-current driving module works abnormally or not, and controlling the signal transmission module to perform signal switching and controlling the standby driving module to be electrified when the constant-current driving module drives abnormally; the standby driving module is used for driving the illumination work of the LED module through the signal transmission module, and the signal transmission module is used for switching a transmitted signal channel; and the LED module is used for illumination work and current detection. The LED power supply with constant current control can maintain the illumination control of the LED module when a driving fault occurs, thereby improving the illumination work efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of LED power supplies, and specifically relates to an LED power supply with constant current control. Background Technique

[0002] With the increasing popularity of LED lighting nowadays, as the life support of LEDs, LED power supplies have also received more and more attention. LED power supplies in the prior art generally adopt the method of being powered by a constant current power supply, and constant current regulation is performed by a relevant constant current driver. However, when the constant current driver fails to drive the LED to work properly when powered on, it will cause the LED to be unable to perform normal lighting work, so there is room for improvement. Content of the Utility Model

[0003] The embodiment of the utility model provides an LED power supply with constant current control to solve the problems raised in the above background technique.

[0004] To achieve the above object, the utility model provides the following technical solutions:

[0005] An LED power supply with constant current control includes: a power supply module, a power supply detection module, a constant current drive module, a drive detection module, a standby drive module, a signal transmission module, and an LED module;

[0006] The power supply module is used to access alternating current energy, step down, rectify, regulate the voltage, and filter the alternating current energy and output a direct current voltage regulation;

[0007] The power supply detection module is connected to the power supply module and is used to isolate and detect the direct current voltage regulation and output a first control signal when receiving the direct current voltage regulation;

[0008] The constant current drive module is connected to the power supply module and the signal transmission module and is used to regulate the voltage of the direct current voltage regulation and output a first electric energy, and output a first pulse signal when receiving the first electric energy and the first feedback signal transmitted by the signal transmission module;

[0009] The drive detection module is connected to the power supply detection module and the constant current drive module and is used to isolate and detect the first pulse signal and output a second control signal when not receiving the first pulse signal and receiving the first control signal;

[0010] The standby drive module is connected to the constant current drive module, the drive detection module, and the signal transmission module and is used to receive the second control signal and output a second pulse signal when receiving the first electric energy and the first feedback signal transmitted by the signal transmission module;

[0011] A signal transmission module, connected to the LED module, is configured to transmit a first pulse signal to the LED module and transmit a first feedback signal output by the LED module to the constant current drive module. When receiving a second control signal, it transmits a second pulse signal to the LED module and transmits the first feedback signal to the backup drive module;

[0012] An LED module, connected to the power supply module, is configured to perform lighting work when receiving the first pulse signal or the second pulse signal transmitted by the signal transmission module, and sample the working current and output a first feedback signal when performing lighting work.

[0013] As a further solution of the present utility model: The power supply module includes a power interface, a power processing device, and a first capacitor; the power supply detection module includes a first resistor, a first optocoupler, a first power supply, and a second resistor;

[0014] Preferably, the first end and the second end of the power interface are respectively connected to the first end and the second end of the power processing device. The third end of the power processing device is connected to the first end of the first capacitor and connected to the first end of the first optocoupler through the first resistor. The fourth end of the power processing device, the second end of the first capacitor, and the second end of the first optocoupler are all grounded. The third end of the first optocoupler is connected to the first power supply. The fourth end of the first optocoupler is connected to the drive detection module and the first end of the second resistor, and the second end of the second resistor is grounded.

[0015] As a further solution of the present utility model: The constant current drive module includes a third resistor, a first diode, a second capacitor, and a first driver;

[0016] Preferably, the cathode of the first diode is connected to one end of the second capacitor and the third end of the first driver and connected to the first end of the first capacitor through the third resistor. The anode of the first diode, the other end of the second capacitor, and the second end of the first driver are all grounded. The fourth end and the first end of the first driver are connected to the signal transmission module.

[0017] As a further solution of the present utility model: The backup drive module includes a first power transistor and a second driver;

[0018] Preferably, the drain of the first power transistor is connected to the cathode of the first diode. The source of the first power transistor is connected to the third end of the second driver. The second end of the second driver is grounded. The fourth end and the first end of the second driver are connected to the signal transmission module. The gate of the first power transistor is connected to the drive detection module.

[0019] As a further solution of the present utility model: The signal transmission module includes a second power supply, a fourth resistor, a first switching transistor, and a first analog switch;

[0020] Preferably, the first end, tenth end, third end, and eighth end of the first analog switch are respectively connected to the fourth end of the first driver, the first end of the first driver, the fourth end of the second driver, and the eighth end of the second driver. The twelfth end and the thirteenth end of the first driver are both connected to the collector of the first switching transistor and connected to the second power supply through the fourth resistor. The base of the first switching transistor is connected to the fifth end and the sixth end of the first analog switch and connected to the gate of the first power transistor and the drive detection module through the eighth resistor. The emitter of the first switching transistor is grounded. The second end of the first driver is connected to the fourth end of the first driver, and the eleventh end of the first driver is connected to the ninth end of the first driver.

[0021] As a further solution of the present invention: The LED module includes a first LED module, a second power transistor, and a fifth resistor;

[0022] Preferably, the first end of the first LED module is connected to the first end of the first capacitor, the second end of the first LED module is connected to the drain of the second power transistor, the source of the second power transistor is connected to the eleventh end of the first analog switch and grounded through the fifth resistor, and the gate of the second power transistor is connected to the second end of the first analog switch.

[0023] As a further solution of the present invention: The drive detection module includes a sixth resistor, a second optocoupler, a seventh resistor, a third power supply, and a first logic chip;

[0024] Preferably, the first end of the second optocoupler is connected to the fourth end of the first driver through the sixth resistor, the second end of the second optocoupler is grounded, the third end of the second optocoupler is connected to the A end of the first logic chip and connected to the third power supply through the seventh resistor, the fourth end of the second optocoupler is grounded, the B end of the first logic chip is connected to the first end of the second resistor, and the F end of the first logic chip is connected to the gate of the first power transistor.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows: The constant-current controlled LED power supply of the present invention uses the constant-current drive module to perform constant-current regulation on the electric energy output after being processed by the power supply module according to the feedback signal output by the LED module, so as to meet the constant-current drive of the LED module. At the same time, the power supply detection module cooperates with the drive detection module to judge whether the constant-current drive module is driving normally under the power supply state of the power supply module. If the driving work is not carried out, the feedback signal is transmitted to the standby drive module through the signal transmission module, and the drive control of the LED module is completed through the standby drive module, maintaining the lighting control of the LED module and improving the lighting work efficiency. Description of the Drawings

[0026] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments of the present invention. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0027] Figure 1 It is a schematic block diagram of the principle of a constant current controlled LED power supply provided by an example of the present invention.

[0028] Figure 2 It is a circuit diagram of a constant current controlled LED power supply provided by an example of the present invention.

[0029] Figure 3 It is a connection circuit diagram of the drive detection module provided by an example of the present invention. Detailed implementation manners

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0031] In one embodiment, please refer to Figure 1 , a constant current controlled LED power supply includes: a power supply module 1, a power supply detection module 2, a constant current drive module 3, a drive detection module 4, a standby drive module 5, a signal transmission module 6, and an LED module 7;

[0032] Specifically, the power supply module 1 is used to access AC electrical energy, perform step-down, rectification, voltage regulation, and filtering on the AC electrical energy, and output a DC regulated voltage;

[0033] The power supply detection module 2 is connected to the power supply module 1 and is used to perform isolation detection on the DC regulated voltage and output a first control signal when receiving the DC regulated voltage;

[0034] The constant current drive module 3 is connected to the power supply module 1 and the signal transmission module 6, and is used to perform voltage regulation on the DC regulated voltage and output a first electrical energy. When receiving the first electrical energy and the first feedback signal transmitted by the signal transmission module 6, it outputs a first pulse signal;

[0035] The drive detection module 4 is connected to the power supply detection module 2 and the constant current drive module 3, and is used to perform isolation detection on the first pulse signal and output a second control signal when not receiving the first pulse signal and receiving the first control signal;

[0036] Standby drive module 5, connected to the constant current drive module 3, drive detection module 4 and signal transmission module 6, is used to receive the second control signal and output a second pulse signal when receiving the first electric energy and the first feedback signal transmitted by the signal transmission module 6;

[0037] Signal transmission module 6, connected to the LED module 7, is used to transmit the first pulse signal to the LED module 7 and transmit the first feedback signal output by the LED module 7 to the constant current drive module 3. When receiving the second control signal, it transmits the second pulse signal to the LED module 7 and transmits the first feedback signal to the standby drive module 5;

[0038] LED module 7, connected to the power supply module 1, is used to perform lighting work when receiving the first pulse signal or the second pulse signal transmitted by the signal transmission module 6, and when performing lighting work, sample the working current and output the first feedback signal.

[0039] In a specific embodiment, the above-mentioned power supply module 1 can adopt a power supply circuit composed of a power supply interface, a power supply processing device and a capacitor, which can access AC electric energy and perform step-down, rectification, voltage regulation and filtering processing on the AC electric energy; the above-mentioned power supply detection module 2 can adopt a power supply detection circuit composed of an optocoupler, a resistor and a power supply, which can detect the power supply state of the power supply module 1; the above-mentioned constant current drive module 3 can adopt a constant current drive circuit composed of a resistor, a diode and a constant current driver, which can perform constant current regulation processing on the input electric energy according to the signal transmitted by the signal transmission module 6; the above-mentioned drive detection module 4 can adopt a drive detection circuit composed of an optocoupler, a resistor, a logic chip, etc., which can perform isolation detection on the signal output by the constant current drive module 3 and judge the state of the signal output by the constant current drive module 3 when the power supply detection module 2 detects that the power supply module 1 is in a powered state; the above-mentioned standby drive module 5 can adopt a standby drive circuit composed of a constant current driver and a power transistor, which can perform standby constant current regulation processing on the input electric energy; the above-mentioned signal transmission module 6 can adopt a signal transmission circuit composed of an analog switch, a triode, a resistor, etc., which can transmit the signals output by the constant current drive module 3, the standby drive module 5 and the LED module 7; the above-mentioned LED module 7 can adopt an LED circuit composed of a power transistor, a resistor and an LED module group to perform constant current control, lighting control and current sampling.

[0040] In another embodiment, please refer to Figure 1 、 Figure 2 and Figure 3 The power supply module 1 includes a power supply interface, a power supply processing device and a first capacitor C1; the power supply detection module 2 includes a first resistor R1, a first optocoupler U1, a first power supply VCC1 and a second resistor R2;

[0041] Specifically, the first end and the second end of the power interface are respectively connected to the first end and the second end of the power processing device. The third end of the power processing device is connected to the first end of the first capacitor C1 and is connected to the first end of the first optocoupler U1 through the first resistor R1. The fourth end of the power processing device, the second end of the first capacitor C1, and the second end of the first optocoupler U1 are all grounded. The third end of the first optocoupler U1 is connected to the first power supply VCC1, and the fourth end of the first optocoupler U1 is connected to the drive detection module 4 and the first end of the second resistor R2, and the second end of the second resistor R2 is grounded.

[0042] In a specific embodiment, the above-mentioned power processing device can be a power processing circuit composed of a transformer, a rectifier, a capacitor, and a voltage regulator to achieve the step-down, rectification, filtering, and voltage regulation of AC electrical energy; the above-mentioned first optocoupler U1 can be a PC817 optocoupler.

[0043] Further, the constant current drive module 3 includes a third resistor R3, a first diode D1, a second capacitor C2, and a first driver IC1;

[0044] Specifically, the cathode of the first diode D1 is connected to one end of the second capacitor C2 and the third end of the first driver IC1 and is connected to the first end of the first capacitor C1 through the third resistor R3. The anode of the first diode D1, the other end of the second capacitor C2, and the second end of the first driver IC1 are all grounded. The fourth end and the first end of the first driver IC1 are connected to the signal transmission module 6.

[0045] In a specific embodiment, the above-mentioned third resistor R3, first diode D1, and second capacitor C2 perform rectification and filtering work; the above-mentioned first driver IC1 can be a QX7136 chip.

[0046] Further, the backup drive module 5 includes a first power transistor Q1 and a second driver IC2;

[0047] Specifically, the drain of the first power transistor Q1 is connected to the cathode of the first diode D1, the source of the first power transistor Q1 is connected to the third end of the second driver IC2, the second end of the second driver IC2 is grounded, the fourth end and the first end of the second driver IC2 are connected to the signal transmission module 6, and the gate of the first power transistor Q1 is connected to the drive detection module 4.

[0048] In a specific embodiment, the above-mentioned first power transistor Q1 can be an N-channel field effect transistor; the above-mentioned second driver IC2 can be a QX7136 chip.

[0049] Further, the signal transmission module 6 includes a second power supply VCC2, a fourth resistor R4, a first switching transistor V1, and a first analog switch IC3;

[0050] Specifically, the first terminal, tenth terminal, third terminal, and eighth terminal of the first analog switch IC3 are respectively connected to the fourth terminal of the first driver IC1, the first terminal of the first driver IC1, the fourth terminal of the second driver IC2, and the eighth terminal of the second driver IC2. The twelfth terminal and the thirteenth terminal of the first driver IC1 are both connected to the collector of the first switching transistor V1 and are connected to the second power supply VCC2 through the fourth resistor R4. The base of the first switching transistor V1 is connected to the fifth terminal and the sixth terminal of the first analog switch IC3 and is connected to the gate of the first power transistor Q1 and the drive detection module 4 through the eighth resistor. The emitter of the first switching transistor V1 is grounded. The second terminal of the first driver IC1 is connected to the fourth terminal of the first driver IC1, and the eleventh terminal of the first driver IC1 is connected to the ninth terminal of the first driver IC1.

[0051] In a specific embodiment, the above-mentioned first analog switch IC3 can be selected as a CD4066 chip; the above-mentioned first switching transistor V1 can be selected as an NPN type triode.

[0052] Further, the LED module 7 includes a first LED module, a second power transistor Q2, and a fifth resistor R5;

[0053] Specifically, the first terminal of the first LED module is connected to the first terminal of the first capacitor C1, the second terminal of the first LED module is connected to the drain of the second power transistor Q2, the source of the second power transistor Q2 is connected to the eleventh terminal of the first analog switch IC3 and is grounded through the fifth resistor R5, and the gate of the second power transistor Q2 is connected to the second terminal of the first analog switch IC3.

[0054] In a specific embodiment, the above-mentioned second power transistor Q2 can be selected as an N-channel field effect transistor; the above-mentioned fifth resistor R5 performs current sampling.

[0055] Further, the drive detection module 4 includes a sixth resistor R6, a second optocoupler U2, a seventh resistor R7, a third power supply VCC3, and a first logic chip IC4;

[0056] Specifically, the first terminal of the second optocoupler U2 is connected to the fourth terminal of the first driver IC1 through the sixth resistor R6, the second terminal of the second optocoupler U2 is grounded, the third terminal of the second optocoupler U2 is connected to the A terminal of the first logic chip IC4 and is connected to the third power supply VCC3 through the seventh resistor R7, the fourth terminal of the second optocoupler U2 is grounded, the B terminal of the first logic chip IC4 is connected to the first terminal of the second resistor R2, and the F terminal of the first logic chip IC4 is connected to the gate of the first power transistor Q1.

[0057] In a specific embodiment, the above-mentioned second optocoupler U2 can be selected as a PC817 optocoupler; the above-mentioned first logic chip IC4 can be selected as an AND gate chip.

[0058] In a constant-current controlled LED power supply according to this embodiment, AC electrical energy is accessed through a power interface, and the power processing device performs step-down, rectification, filtering, and voltage regulation on the AC electrical energy. At the same time, the first optocoupler U1 conducts, causing the B terminal of the first logic chip IC4 to become high level. The third resistor R3, the first diode D1, and the second capacitor C2 further perform voltage regulation and filtering operations to supply power to the first driver IC1. The second power supply VCC2 triggers the twelfth and thirteenth terminals of the first analog switch IC3 to become high level through the fourth resistor R4. The first and second terminals of the first analog switch IC3 conduct, and the tenth and eleventh terminals conduct. The current signal sampled by the fifth resistor R5 is transmitted to the first terminal of the first driver IC1. The fourth terminal of the first driver IC1 outputs a first pulse signal and drives the conduction of the second power transistor, enabling the first LED module to perform lighting work. If the fourth terminal of the first driver IC1 does not output the first pulse signal, the second optocoupler U2 will cut off, causing the A terminal of the first logic chip IC4 to become high level. The F terminal of the first logic chip IC4 outputs a high level and controls the conduction of the first power transistor Q1. The first switch transistor V1 conducts, and the sixth and fifth terminals of the first analog switch IC3 become high level. At this time, the signal sampled by the fifth resistor R5 is transmitted to the first terminal of the second driver IC2 through the first analog switch IC3. The second pulse signal output by the fourth terminal of the second driver IC2 is transmitted to the second power transistor through the first analog switch IC3 to maintain the lighting work of the first LED module.

[0059] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and without departing from the spirit or basic characteristics of the present invention, the present invention can be implemented in other specific forms. Therefore, in any regard, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claimed rights.

[0060] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An LED power supply with constant current control, characterized in that the LED power supply with constant current control includes: a power supply module, a power supply detection module, a constant current drive module, a drive detection module, a standby drive module, a signal transmission module, and an LED module; the power supply module is used to access AC electrical energy, step down, rectify, regulate voltage, and filter the AC electrical energy and output a DC regulated voltage; the power supply detection module is connected to the power supply module, and is used to isolate and detect the DC regulated voltage and output a first control signal when receiving the DC regulated voltage; the constant current drive module is connected to the power supply module and the signal transmission module, and is used to regulate the DC regulated voltage and output a first electrical energy, and output a first pulse signal when receiving the first electrical energy and the first feedback signal transmitted by the signal transmission module; the drive detection module is connected to the power supply detection module and the constant current drive module, and is used to isolate and detect the first pulse signal and output a second control signal when not receiving the first pulse signal and receiving the first control signal; the standby drive module is connected to the constant current drive module, the drive detection module, and the signal transmission module, and is used to receive the second control signal and output a second pulse signal when receiving the first electrical energy and the first feedback signal transmitted by the signal transmission module; the signal transmission module is connected to the LED module, and is used to transmit the first pulse signal to the LED module and transmit the first feedback signal output by the LED module to the constant current drive module, and when receiving the second control signal, transmit the second pulse signal to the LED module and transmit the first feedback signal to the standby drive module; the LED module is connected to the power supply module, and is used to perform lighting work when receiving the first pulse signal or the second pulse signal transmitted by the signal transmission module, and sample the working current and output a first feedback signal when performing lighting work.

2. The constant-current controlled LED power supply according to claim 1, wherein The power supply module includes a power supply interface, a power supply processing device, and a first capacitor; the power supply detection module includes a first resistor, a first optocoupler, a first power supply, and a second resistor; The first end and the second end of the power supply interface are respectively connected to the first end and the second end of the power supply processing device. The third end of the power supply processing device is connected to the first end of the first capacitor and is connected to the first end of the first optocoupler through the first resistor. The fourth end of the power supply processing device, the second end of the first capacitor, and the second end of the first optocoupler are all grounded. The third end of the first optocoupler is connected to the first power supply. The fourth end of the first optocoupler is connected to the drive detection module and the first end of the second resistor, and the second end of the second resistor is grounded.

3. The constant current controlled LED power supply according to claim 2, characterized in that, The constant current drive module includes a third resistor, a first diode, a second capacitor, and a first driver; The cathode of the first diode is connected to one end of the second capacitor and the third end of the first driver and is connected to the first end of the first capacitor through the third resistor. The anode of the first diode, the other end of the second capacitor, and the second end of the first driver are all grounded. The fourth end and the first end of the first driver are connected to the signal transmission module.

4. The constant-current controlled LED power supply according to claim 3, characterized in that, The standby drive module includes a first power transistor and a second driver; The drain of the first power transistor is connected to the cathode of the first diode. The source of the first power transistor is connected to the third terminal of the second driver. The second terminal of the second driver is grounded. The fourth and first terminals of the second driver are connected to the signal transmission module. The gate of the first power transistor is connected to the drive detection module.

5. The constant-current controlled LED power supply according to claim 4, wherein, The signal transmission module includes a second power supply, a fourth resistor, a first switching transistor, and a first analog switch. The first, tenth, third, and eighth terminals of the first analog switch are respectively connected to the fourth terminal of the first driver, the first terminal of the first driver, the fourth terminal of the second driver, and the eighth terminal of the second driver. The twelfth and thirteenth terminals of the first driver are both connected to the collector of the first switching transistor and are connected to the second power supply through the fourth resistor. The base of the first switching transistor is connected to the fifth and sixth terminals of the first analog switch and is connected to the gate of the first power transistor and the drive detection module through the eighth resistor. The emitter of the first switching transistor is grounded. The second terminal of the first driver is connected to the fourth terminal of the first driver. The eleventh terminal of the first driver is connected to the ninth terminal of the first driver.

6. The constant-current controlled LED power supply according to claim 5, wherein, The LED module includes a first LED module, a second power transistor, and a fifth resistor. The first terminal of the first LED module is connected to the first terminal of the first capacitor. The second terminal of the first LED module is connected to the drain of the second power transistor. The source of the second power transistor is connected to the eleventh terminal of the first analog switch and is grounded through the fifth resistor. The gate of the second power transistor is connected to the second terminal of the first analog switch.

7. The constant-current controlled LED power supply according to claim 6, characterized in that, The drive detection module includes a sixth resistor, a second optocoupler, a seventh resistor, a third power supply, and a first logic chip. The first terminal of the second optocoupler is connected to the fourth terminal of the first driver through the sixth resistor. The second terminal of the second optocoupler is grounded. The third terminal of the second optocoupler is connected to the A terminal of the first logic chip and is connected to the third power supply through the seventh resistor. The fourth terminal of the second optocoupler is grounded. The B terminal of the first logic chip is connected to the first terminal of the second resistor. The F terminal of the first logic chip is connected to the gate of the first power transistor.

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