CN213662021U

CN213662021U - Constant-current constant-voltage LED driving power supply

Info

Publication number: CN213662021U
Application number: CN202022973238.6U
Authority: CN
Inventors: 童毅
Original assignee: Zhuhai Nixon Electronic Technology Co ltd
Current assignee: Zhuhai Nixon Electronic Technology Co ltd
Priority date: 2020-12-11
Filing date: 2020-12-11
Publication date: 2021-07-09
Anticipated expiration: 2030-12-11

Abstract

The utility model discloses a constant current and constant voltage LED driving power supply, which comprises a rectification module, a transformation module, a voltage transformation module, a control driving module, an output module, a current sampling module, a voltage sampling module, a constant current and constant voltage control module and an isolation feedback module; the rectification module, the transformation module and the output module are electrically connected in sequence, and the control driving module is electrically connected with the transformation module; the input end of the current sampling module is electrically connected with the output module, the output end of the current sampling module is electrically connected with the constant-current constant-voltage control module, the input end of the voltage sampling module is electrically connected with the output module, and the output end of the voltage sampling module is electrically connected with the constant-current constant-voltage control module; the constant-current and constant-voltage control module, the isolation feedback module and the control driving module are electrically connected in sequence. The utility model discloses a LED drive power supply can realize constant current and constant voltage output simultaneously.

Description

Constant-current constant-voltage LED driving power supply

Technical Field

The utility model belongs to the technical field of the LED drive power supply technique and specifically relates to a constant current constant voltage LED drive power supply.

Background

The LED driving power is a power converter that converts an original power into a specific voltage and current to drive an LED to emit light, and is widely used in various LED lighting devices. The LED driving power supply mainly comprises a constant current type driving mode and a constant voltage type driving mode, the current output by the constant current type driving circuit is constant, the output direct current voltage changes within a certain range along with the difference of the resistance value of a load, after various parameters in the constant voltage type driving circuit are determined, the output voltage is fixed, and the output current changes along with the increase and decrease of the load. The LED driving power supply in the prior art is difficult to realize constant current and constant voltage control at the same time.

SUMMERY OF THE UTILITY MODEL

The utility model provides a constant current constant voltage LED drive power supply can realize constant current and constant voltage output simultaneously.

In order to solve the above problem, the utility model adopts the following technical scheme:

a constant-current constant-voltage LED driving power supply comprises a rectifying module, a converting module, a voltage transformation module, a control driving module, an output module, a current sampling module, a voltage sampling module, a constant-current constant-voltage control module and an isolation feedback module; the rectification module, the transformation module and the output module are electrically connected in sequence, and the control driving module is electrically connected with the transformation module; the input end of the current sampling module is electrically connected with the output module, the output end of the current sampling module is electrically connected with the constant-current constant-voltage control module, the input end of the voltage sampling module is electrically connected with the output module, and the output end of the voltage sampling module is electrically connected with the constant-current constant-voltage control module; the constant-current and constant-voltage control module, the isolation feedback module and the control driving module are electrically connected in sequence.

Preferably, the constant current and constant voltage control module comprises a chip SEA 05.

Preferably, the voltage sampling module includes a first voltage-dividing resistor and a second voltage-dividing resistor, the forward output end of the voltage transformation module, the first voltage-dividing resistor, the second voltage-dividing resistor and the ground end are electrically connected in sequence, and one end of the first voltage-dividing resistor, which is electrically connected to the second voltage-dividing resistor, is electrically connected to pin 3 of the SEA 05.

Preferably, the current sampling module includes an output current sampling unit and an inverse current sampling unit.

Preferably, the output current sampling unit includes a first sampling resistor, and two ends of the first sampling resistor are electrically connected to the negative output end of the voltage transformation module and the 4 pins of the SEA 05.

Preferably, the reverse current sampling unit comprises a second sampling resistor, a third sampling resistor, a capacitor C41 and a capacitor C36; the negative output end of the voltage transformation module, the second sampling resistor, the third sampling resistor, the capacitor C41, the capacitor C36 and the ground end are electrically connected in sequence; one end of the second sampling resistor, which is electrically connected with the third sampling resistor, is electrically connected with pin 1 of the SEA05 chip.

Preferably, the isolation feedback module comprises a photoelectric coupler, and a positive input end of the photoelectric coupler and a pin 6 of the chip SEA05 are both electrically connected with the power module.

Preferably, the power supply module comprises a triode Q6, a resistor R41, a capacitor C27 and a voltage regulator tube D15, wherein a collector of the triode Q6 is electrically connected with the positive output end of the voltage transformation module, a base of the triode Q6, a voltage regulator tube D15 and a ground end are electrically connected in sequence, an emitter of the triode Q6, the capacitor C27 and the ground end are electrically connected in sequence, and two ends of the resistor R41 are respectively and electrically connected with a collector and a base of the triode Q6.

Preferably, the output module includes a bridge rectifier unit, a filter unit and a voltage stabilizer unit.

Preferably, the voltage stabilizing unit includes a first voltage stabilizing diode, a second voltage stabilizing diode and a resistor R55, and the positive output end of the transformer module, the first voltage stabilizing diode, the second voltage stabilizing diode, the resistor R55 and the negative output end of the transformer module are electrically connected in sequence.

The utility model discloses following beneficial effect has: the utility model discloses a current value of current sampling module detection LED drive power supply output to detect the magnitude of voltage of LED drive power supply output through voltage sampling module, the current value and the magnitude of voltage that detect are handled the back by constant current constant voltage control module, constant current constant voltage control module produces feedback signal, feedback signal feeds back to the control drive module of LED drive power supply primary part through keeping apart feedback module, change the control signal who exports transform module with drive control drive module, thereby obtain the LED drive signal of constant current and constant voltage.

Drawings

Fig. 1 is a schematic structural diagram of a constant current and constant voltage LED driving power supply according to an embodiment of the present invention;

fig. 2 is a schematic circuit diagram of a part of a constant current and constant voltage LED driving power supply according to an embodiment of the present invention.

Detailed Description

The present disclosure provides the following description with reference to the accompanying drawings to assist in a comprehensive understanding of various embodiments of the disclosure as defined by the claims and their equivalents. The description includes various specific details to aid understanding, but such details are to be regarded as exemplary only. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the various embodiments described herein can be made without departing from the scope and spirit of the present disclosure. Moreover, descriptions of well-known functions and constructions may be omitted for clarity and conciseness.

The terms and words used in the following description and claims are not limited to the literal meanings, but are used by the inventors to enable a clear and consistent understanding of the disclosure. Accordingly, it will be apparent to those skilled in the art that the following descriptions of the various embodiments of the present disclosure are provided for illustration only and not for the purpose of limiting the disclosure as defined by the appended claims and their equivalents.

The terms "having," "may have," "including," or "may include" used in various embodiments of the present disclosure indicate the presence of the respective functions, operations, elements, etc., disclosed, but do not limit additional one or more functions, operations, elements, etc. Furthermore, it is to be understood that the terms "comprises" or "comprising," when used in various embodiments of the present disclosure, are intended to specify the presence of stated features, integers, operations, elements, components, or groups thereof, but do not preclude the presence or addition of one or more other features, integers, operations, elements, components, or groups thereof.

Although terms such as "first" and "second" used in various embodiments of the present disclosure may modify various elements of the various embodiments, the terms do not limit the corresponding elements. For example, these terms do not limit the order and/or importance of the corresponding elements. These terms may be used to distinguish one element from another. For example, the first user equipment and the second user equipment both indicate user equipment, and may indicate different user equipment. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of the various embodiments of the present disclosure.

It will be understood that when an element (e.g., a first element) is "electrically connected" to another element (e.g., a second element), the element can be directly electrically connected to the other element or intervening elements (e.g., a third element) may be present.

An embodiment of the utility model provides a constant current constant voltage LED drive power supply, as shown in fig. 1, it includes rectifier module 2, transform module 3, vary voltage module 4, control drive module 6, output module 5, current sampling module 7, voltage sampling module 8, constant current constant voltage control module 9 and isolation feedback module 10. The rectification module 2, the transformation module 3, the transformation module 4 and the output module 5 are electrically connected in sequence, and the control driving module 6 is electrically connected with the transformation module 3. The input end of the rectification module 2 is used for being electrically connected with the mains supply 1 and converting an alternating current signal of the mains supply 1 into a direct current signal, and the rectification module 2 can be a bridge rectifier circuit. The control driving module 6 outputs a PWM control signal to the transforming module 3, and controls the transforming module 3 to be turned on or off according to a preset frequency, so as to change the voltage value input to the transforming module 4. The transformation module 4 may be a transformer, the secondary output of the transformation module includes a positive output end and a negative output end, the output module 5 is electrically connected to the positive output end and the negative output end of the transformation module 4, and the output module 5 outputs constant-current and constant-voltage LED driving signals.

The input end of the current sampling module 7 is electrically connected with the output module 5 to detect the current value of the output end, and the output end of the current sampling module 7 is electrically connected with the constant current and constant voltage control module 9 to input the detected current value to the constant current and constant voltage control module 9. The input end of the voltage sampling module 8 is electrically connected with the output module 5 to detect the voltage value of the output end, and the output end of the voltage sampling module 8 is electrically connected with the constant current and constant voltage control module 9 to input the detected voltage value to the constant current and constant voltage control module 9. The constant current and constant voltage control module 9, the isolation feedback module 10 and the control driving module 6 are electrically connected in sequence, the constant current and constant voltage control module 9 generates a feedback signal according to the collected current value and voltage value, the feedback signal is fed back to the control driving module 6 through the isolation feedback module 10, and the control driving module 6 changes the control signal output to the conversion module 3, so that the LED driving signal output by the output module 5 keeps constant current and constant voltage.

In one embodiment, the constant current and voltage control module 9 includes a chip SEA05, and SEA05 is a highly integrated constant current and voltage regulation controller, and has the advantages of large working voltage range, high control precision, and less peripheral components. As shown in fig. 2, pin 6 of the chip SEA05 is connected to a dc power supply, pin 2 is connected to ground,

pins

1 and 4 collect current, pin 3 collects voltage, and pin 5 outputs a feedback signal.

In an embodiment, the voltage sampling module 8 includes a first voltage-dividing resistor R58 and a second voltage-dividing resistor R60, the forward output terminal of the transformer module 4, the first voltage-dividing resistor R58, the second voltage-dividing resistor R60 and the ground terminal are electrically connected in sequence to form a voltage-dividing circuit, one end of the first voltage-dividing resistor R58 electrically connected to the second voltage-dividing resistor R60 is electrically connected to pin 3 of the SEA05, pin 3 of the SEA05 acquires the voltage value of the second voltage-dividing resistor R60, and according to a voltage calculation formula of the voltage-dividing circuit, the voltage value of the second voltage-dividing resistor R60 and the voltage value of the output terminal are in a proportional relationship, so that the voltage value of the output terminal can be acquired, and after being processed by a transport amplifier inside the SEA05, a preset voltage adjustment setting value is output.

In one embodiment, the current sampling module 7 includes an output current sampling unit and an inverse current sampling unit, the current value collected by the output current sampling unit is input to pin 4 of the SEA05 chip, the current value collected by the inverse current sampling unit is input to pin 1 of the SEA05 chip, the two collected current values are processed by another transport amplifier inside the SEA05 chip, and the two internal operational amplifiers are output in a common open drain mode.

In an embodiment, the output current sampling unit includes a first sampling resistor R51, and two ends of the first sampling resistor R51 are electrically connected to the negative output terminal of the voltage transformation module 4 and the 4 pins of the SEA05, respectively, so as to sample the current value of the output terminal.

In an embodiment, the reverse current sampling unit includes a second sampling resistor R56, a third sampling resistor R61, a capacitor C41, and a capacitor C36, the negative output end of the voltage transformation module 4, the second sampling resistor R56, the third sampling resistor R61, the capacitor C41, the capacitor C36, and the ground end are electrically connected in sequence, one end of the second sampling resistor R56, which is electrically connected to the third sampling resistor R61, is electrically connected to the 1 pin of the chip SEA05, and the reverse current is collected by sensing a voltage.

In one embodiment, the isolation feedback module 10 includes a photocoupler U3, a 4 pin of the photocoupler is electrically connected to the control driving module 6, a forward input terminal (pin 1) of the photocoupler and a 6 pin of the chip SEA05 are both electrically connected to the power module, and both the photocoupler and the chip SEA05 are powered by the same power module, which can simplify the circuit structure.

In one embodiment, the power module includes a transistor Q6, a resistor R41, a capacitor C27, and a voltage regulator D15, wherein a collector of the transistor Q6 is electrically connected to the positive output terminal of the voltage transformation module 4, a base of the transistor Q6, a voltage regulator D15, and a ground terminal are electrically connected in sequence, an emitter of the transistor Q6, the capacitor C27, and the ground terminal are electrically connected in sequence, and two ends of the resistor R41 are electrically connected to a collector and a base of the transistor Q6, respectively. The base electrode of the triode Q6 is connected with a high level signal through the resistor R41, so that the triode is conducted, a voltage signal output by the forward output end of the transformation module 4 is used as a photoelectric coupler and a current source of the chip SEA05, namely, the output voltage of the output end is used as a voltage source, no additional power supply equipment is needed, and the whole circuit structure is simplified.

In one embodiment, the output module 5 includes a bridge rectifier unit, a filter unit, and a voltage regulator unit, and further includes an output interface J2, where the output interface J2 outputs an LED driving signal.

In one embodiment, the bridge rectifier unit is a rectifier bridge formed by four schottky diodes (two diodes D12 and two diodes D11), and the filter unit is an LC filter circuit. The voltage stabilizing unit comprises a first voltage stabilizing diode D22, a second voltage stabilizing diode D21 and a resistor R55, and the positive output end of the transformation module 4, the first voltage stabilizing diode D22, the second voltage stabilizing diode D21, the resistor R55 and the negative output end of the transformation module 4 are electrically connected in sequence.

The foregoing is a more detailed description of the present invention that is presented in conjunction with specific embodiments, and it is not to be understood that the specific embodiments of the present invention are limited to these descriptions. To the utility model belongs to the technical field of ordinary technical personnel, do not deviate from the utility model discloses under the prerequisite of design, can also make a plurality of simple deductions or replacement.

Claims

1. A constant current constant voltage LED drive power supply which characterized in that: the device comprises a rectification module, a transformation module, a voltage transformation module, a control driving module, an output module, a current sampling module, a voltage sampling module, a constant current and constant voltage control module and an isolation feedback module; the rectification module, the transformation module and the output module are electrically connected in sequence, and the control driving module is electrically connected with the transformation module; the input end of the current sampling module is electrically connected with the output module, the output end of the current sampling module is electrically connected with the constant-current constant-voltage control module, the input end of the voltage sampling module is electrically connected with the output module, and the output end of the voltage sampling module is electrically connected with the constant-current constant-voltage control module; the constant-current and constant-voltage control module, the isolation feedback module and the control driving module are electrically connected in sequence.

2. The constant-current constant-voltage LED driving power supply according to claim 1, characterized in that: the constant-current and constant-voltage control module comprises a chip SEA 05.

3. The constant-current constant-voltage LED driving power supply according to claim 2, characterized in that: the voltage sampling module comprises a first voltage-dividing resistor and a second voltage-dividing resistor, the forward output end, the first voltage-dividing resistor, the second voltage-dividing resistor and the ground end of the voltage transformation module are electrically connected in sequence, and one end of the first voltage-dividing resistor, which is electrically connected with the second voltage-dividing resistor, is electrically connected with the 3 pins of the chip SEA 05.

4. The constant-current constant-voltage LED driving power supply according to claim 2, characterized in that: the current sampling module comprises an output current sampling unit and an inverse current sampling unit.

5. The constant-current constant-voltage LED driving power supply according to claim 4, wherein: the output current sampling unit comprises a first sampling resistor, and two ends of the first sampling resistor are respectively and electrically connected with the negative output end of the voltage transformation module and the 4 pins of the chip SEA 05.

6. The constant-current constant-voltage LED driving power supply according to claim 4, wherein: the reverse current sampling unit comprises a second sampling resistor, a third sampling resistor, a capacitor C41 and a capacitor C36; the negative output end of the voltage transformation module, the second sampling resistor, the third sampling resistor, the capacitor C41, the capacitor C36 and the ground end are electrically connected in sequence; one end of the second sampling resistor, which is electrically connected with the third sampling resistor, is electrically connected with pin 1 of the SEA05 chip.

7. The constant-current constant-voltage LED driving power supply according to claim 2, characterized in that: the isolation feedback module comprises a photoelectric coupler, and the positive input end of the photoelectric coupler and the 6 pins of the chip SEA05 are electrically connected with the power module.

8. The constant-current constant-voltage LED driving power supply according to claim 7, wherein: the power supply module comprises a triode Q6, a resistor R41, a capacitor C27 and a voltage regulator tube D15, wherein a collector of the triode Q6 is electrically connected with a forward output end of the transformation module, a base of the triode Q6, a voltage regulator tube D15 and a ground end are electrically connected in sequence, an emitter of the triode Q6, the capacitor C27 and the ground end are electrically connected in sequence, and two ends of the resistor R41 are respectively and electrically connected with a collector and a base of the triode Q6.

9. The constant-current constant-voltage LED driving power supply according to any one of claims 1 to 6, characterized in that: the output module comprises a bridge rectifier unit, a filter unit and a voltage stabilizing unit.

10. The constant-current constant-voltage LED driving power supply according to claim 9, wherein: the voltage stabilizing unit comprises a first voltage stabilizing diode, a second voltage stabilizing diode and a resistor R55, and the positive output end of the transformation module, the first voltage stabilizing diode, the second voltage stabilizing diode, the resistor R55 and the negative output end of the transformation module are electrically connected in sequence.