Non-isolated constant current circuit

Abstract

The utility model discloses a non-isolated constant current circuit, which comprises a rectifying and filtering unit, a power supply unit and a detection unit, the rectifying and filtering unit is connected with commercial power, rectifies and filters the commercial power and outputs direct current to the power supply unit; the power supply unit stores power and outputs direct current to electric equipment; the detection unit is electrically connected with the power supply unit and used for detecting and limiting the current value of the direct current. Therefore, commercial power is rectified and filtered into 100Hz direct current by adopting the bridge rectifier, energy is stored and supplied by the inductor, non-isolated constant-current power supply is realized for the lamp, the cost is low, the lamp can be independently configured, and the lamp can operate after being connected to the commercial power. And a detection chip is also arranged to detect and limit the output direct current, so that the current value is maintained within the allowable range of the load, and stable operation of the lamp is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of lamp driving power supplies, in particular to a non-isolated constant current circuit. Background Art

[0002] In the field of residential lighting, in addition to main lights used for decorative accessories and providing primary illumination, there are also a variety of other types of lamps, such as scattered non-main lights, spotlights for area lighting, aisle lights, and induction lights. These lamps have a wide range of uses and are used in large quantities. If these lamps are equipped with dedicated isolated power supplies like the main lights, it would be costly and cumbersome to assemble and debug. If multiple lamps are powered by the same driver, while it is convenient to install and debug, there is also the risk that if the driver fails, all lamps will go out or even be damaged. Utility Model Content

[0003] The utility model discloses a non-isolated constant current circuit, which specifically includes the following contents.

[0004] Rectification and filtering unit, power supply unit and detection unit;

[0005] The rectifying and filtering unit is connected to the mains, rectifying and filtering the mains and outputting direct current to the power supply unit;

[0006] The power supply unit stores electricity and outputs direct current to the power-consuming equipment;

[0007] The detection unit is electrically connected to the power supply unit and is used to detect and limit the current value of the direct current.

[0008] Preferably, the rectifier and filter unit includes a mains interface ACIN, a capacitor F1, a capacitor F2, a capacitor F3, a capacitor F4, a capacitor F5, a capacitor F6, a capacitor F7, a capacitor F8, a resistor RV1, a resistor RV2, a resistor RV3, a rectifier chip DB1 and a capacitor CBB1.

[0009] Preferably, capacitor F1, capacitor F2, capacitor F3, capacitor F4, capacitor F5, capacitor F6, capacitor F7, capacitor F8, resistor RV1, resistor RV2, resistor RV3, rectifier chip DB1 and capacitor CBB1 constitute a rectifier bridge stack, which rectifies the AC power input from the AC power interface ACIN and converts it into 100Hz DC power.

[0010] Preferably, the capacitor CBB1 filters the DC power and outputs it to the power supply unit.

[0011] Preferably, the power supply unit includes an inductor L1, a capacitor EC1, a diode D2 and an output interface J1.

[0012] Preferably, the DC power output by the capacitor CBB1 charges the inductor L1 and the capacitor EC1.

[0013] Preferably, the inductor L1 is used to output direct current to the output interface J1 when the diode D2 is turned on.

[0014] Preferably, the detection unit includes a detection chip U1 , whose pin 4 is connected to the output interface J1 via a resistor R1 , and whose pins 5 and 6 are connected to the output end of the inductor L1 .

[0015] Preferably, the seventh pin of the detection chip U1 is an output current detection pin, which is used to detect and limit the current value of the direct current.

[0016] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0017] A bridge rectifier is used to filter the mains power into 100Hz DC, which is then fed by inductive energy storage. This provides a non-isolated constant-current power supply to the lamp. This is a low-cost, standalone configuration that allows the lamp to operate simply by connecting to the mains. A detection chip is also included to monitor and limit the output DC power, keeping the current within the load's allowable range and ensuring stable lamp operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 This is a circuit principle diagram of a non-isolated constant current circuit disclosed in an embodiment of the present utility model. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0021] See also Figure 1 , the non-isolated constant current circuit may include the following contents.

[0022] Rectification and filtering unit, power supply unit and detection unit;

[0023] The rectifier and filter unit is connected to the mains, rectifies and filters the mains, and outputs DC power to the power supply unit;

[0024] The power supply unit stores electricity and outputs direct current to the power-consuming equipment;

[0025] The detection unit is electrically connected to the power supply unit and is used for detecting and limiting the current value of the direct current.

[0026] Here, a rectifier bridge is used to rectify and filter the mains power into 100Hz DC power, and the inductor stores energy to provide non-isolated constant current power supply to the lamp. This is low-cost and can be configured independently for the lamp. The lamp can be operated by connecting to the mains.

[0027] A detection chip is also provided to detect and limit the output DC power, so that the current value is maintained within the allowable range of the load, ensuring stable operation of the lamp.

[0028] In this embodiment, the rectifier and filter unit includes a mains interface ACIN, capacitors F1, F2, F3, F4, F5, F6, F7, F8, resistors RV1, RV2, RV3, a rectifier chip DB1, and a capacitor CBB1.

[0029] In this embodiment, capacitor F1, capacitor F2, capacitor F3, capacitor F4, capacitor F5, capacitor F6, capacitor F7, capacitor F8, resistor RV1, resistor RV2, resistor RV3, rectifier chip DB1 and capacitor CBB1 constitute a rectifier bridge stack, which rectifies the AC power input by the AC power interface ACIN and converts it into 100Hz DC power.

[0030] In this embodiment, the capacitor CBB1 filters the DC power and outputs it to the power supply unit.

[0031] Here, after being rectified by the rectifier bridge and filtered by capacitor CBB1, the DC voltage is input into the power supply unit and waits to be supplied to the lamp for operation.

[0032] In this embodiment, the power supply unit includes an inductor L1 , a capacitor EC1 , a diode D2 , and an output interface J1 .

[0033] In this embodiment, the DC power output by the capacitor CBB1 charges the inductor L1 and the capacitor EC1.

[0034] In this embodiment, the inductor L1 is used to output direct current to the output interface J1 when the diode D2 is turned on.

[0035] In this embodiment, the detection unit includes a detection chip U1 , whose pin 4 is connected to the output interface J1 via a resistor R1 , and whose pins 5 and 6 are connected to the output end of the inductor L1 .

[0036] In this embodiment, the seventh pin of the detection chip U1 is an output current detection pin, which is used to detect and limit the current value of the direct current.

[0037] Here, although the non-isolated mode is adopted to supply power to the load, the detection chip U1 detects the output DC current value in real time, ensures that the DC current is suitable for the load, and provides sufficient safety performance.

[0038] Compared with the prior art, the embodiments of the utility model have the following beneficial effects:

[0039] The rectifier bridge is used to rectify and filter the commercial power into 100Hz DC power, and the inductance is used to store energy to supply power, and the non-isolated constant current power supply is realized for the lamp, the cost is low, the lamp can be independently configured, and the lamp can run after being connected to the commercial power. The detection chip is arranged to detect and limit the output DC current, so that the current value is maintained within the allowable range of the load, and the stable operation of the lamp is ensured.

Claims

1. A non-isolated constant current circuit, characterized in that: include: Rectification and filtering unit, power supply unit and detection unit; The rectifying and filtering unit is connected to the mains, rectifying and filtering the mains and outputting direct current to the power supply unit; The power supply unit stores electricity and outputs direct current to the power-consuming equipment; The detection unit is electrically connected to the power supply unit and is used to detect and limit the current value of the direct current.

2. A non-isolated constant current circuit according to claim 1, characterized in that: include: The rectifier and filter unit includes a mains interface ACIN, capacitors F1, F2, F3, F4, F5, F6, F7, F8, resistors RV1, RV2, RV3, a rectifier chip DB1, and a capacitor CBB1.

3. A non-isolated constant current circuit according to claim 2, characterized in that: include: Capacitor F1, capacitor F2, capacitor F3, capacitor F4, capacitor F5, capacitor F6, capacitor F7, capacitor F8, resistor RV1, resistor RV2, resistor RV3, rectifier chip DB1 and capacitor CBB1 form a rectifier bridge stack, which rectifies the AC power input by the AC power interface ACIN and converts it into 100Hz DC power.

4. A non-isolated constant current circuit according to claim 3, characterized in that: include: The capacitor CBB1 filters the DC power and outputs the filtered DC power to the power supply unit.

5. A non-isolated constant current circuit according to claim 4, characterized in that: include: The power supply unit includes an inductor L1 , a capacitor EC1 , a diode D2 , and an output interface J1 .

6. A non-isolated constant current circuit according to claim 5, characterized in that: include: The DC power output by capacitor CBB1 charges inductor L1 and capacitor EC1.

7. The non-isolated constant current circuit according to claim 6, characterized in that: include: The inductor L1 is used to output direct current to the output interface J1 when the diode D2 is turned on.

8. The non-isolated constant current circuit according to claim 7, characterized in that: include: The detection unit includes a detection chip U1 , whose pin 4 is connected to the output interface J1 via a resistor R1 , and whose pins 5 and 6 are connected to the output end of the inductor L1 .

9. The non-isolated constant current circuit according to claim 8, characterized in that: include: Pin 7 of the detection chip U1 is an output current detection pin, which is used to detect and limit the current value of the DC power.

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