CN202425143U - LED drive circuit and LED lamp - Google Patents

Abstract

The utility model discloses an LED driving circuit and an LED lamp. The LED driving circuit includes a rectifier module, a light source module and a constant current diode. The constant current diode is connected in series with the light source module. The constant current diode can output a constant current in a wide voltage range and has a high dynamic impedance. Therefore, when the power supply voltage in the circuit is unstable, the circuit current can be ensured to be stable, and a stable current can be provided for the light source module, so that the light source module is in an optimal working state and provides lighting for the user. The LED lamp of the utility model includes the above-mentioned LED driving circuit. The LED driving circuit replaces the existing LED driving circuit. The LED lamp saves the driver in structure, so that the volume of the LED lamp is reduced, the structure is simpler, and the cost is also reduced.

Description

LED drive circuit and LED lamp

technical field

The utility model relates to an LED lamp, in particular to an LED driving circuit and an LED lamp.

Background technique

LED (Light Emitting Diode, Light Emitting Diode) is a solid-state semiconductor device that can directly convert electricity into light. At present, LED light sources are gradually replacing incandescent and fluorescent light sources with the characteristics of long life, no pollution, and high luminous efficiency. However, in LED lighting circuits, no matter what kind of power supply it is impossible to directly supply power to LEDs. If you want to use LED as a lighting source, you must solve the problem of LED power drive. Therefore, the existing LED lamps all have a driver for driving the LED, which increases the manufacturing cost of the LED lamp and increases the volume of the LED lamp.

Moreover, the temperature coefficient of the P-N junction of the LED is negative, and the barrier potential of the LED decreases when the temperature rises. Therefore, the LED cannot be directly powered by a voltage source, and current limiting measures must be taken. Otherwise, as the temperature of the LED increases during operation, the current will increase and the LED will be damaged. At the same time, the ratio of the current flowing through the LED to the luminous flux of the LED is also nonlinear. The luminous flux of the LED increases with the increase of the current flowing through the LED, but it is not proportional. The later the luminous flux increases, the less it will be. Therefore, the LED should work at a fixed current value with relatively high luminous efficiency. However, small fluctuations in voltage will cause large fluctuations in current.

Therefore, it is necessary to design a circuit that can keep the current flowing through the LED and make the structure of the LED lamp simple.

Contents of the invention

The technical problem to be solved by the utility model is: to propose an LED driving circuit and an LED lamp, replace the existing LED driving circuit with the LED driving circuit, and save the driver in the structure of the LED lamp, so that the volume of the LED lamp is reduced, and the structure Easier and less costly.

The utility model proposes an LED driving circuit, which includes a rectification module for rectifying the input alternating current, at least one light source module connected at both ends of the rectification module, and a constant The current constant current diode in the circuit, the anode of the rectification module is connected to the anode of the constant current diode; one of the light source modules is connected in series with one of the constant current diodes, and the light source modules are connected in parallel with each other.

Preferably, the input AC power is input to the rectification module after passing through a fuse and a piezoresistor for protecting the circuit.

Preferably, it also includes a filtering module for filtering the pulsating component in the unidirectional pulsating direct current voltage to output a smooth direct current voltage.

Preferably, the filter module includes a filter capacitor and a bleeder resistor, and the filter capacitor and the bleeder resistor are connected in parallel at both ends of the light source module.

Preferably, the light source module includes one or more LED light emitters, the LED light emitters are connected in series or in parallel, and the rectification module includes a rectifier bridge.

The utility model further proposes an LED lamp, which includes a circuit board connected to an external power supply through wires and an LED drive circuit, the LED drive circuit is arranged on the circuit board, and the LED drive circuit includes a rectifier for rectifying the input alternating current module, at least one light source module connected at both ends of the rectifier module, and a constant current diode connected between the rectifier module and the light source module for constant current in the circuit, the anode of the rectifier module is connected to the constant current The anode of the current diode is connected; one of the light source modules is connected in series with one of the constant current diodes, and the light source modules are connected in parallel with each other.

Preferably, the input AC power is input to the rectification module after passing through a fuse and a piezoresistor for protecting the circuit.

Preferably, the LED driving circuit further includes a filtering module for filtering out the pulsating component in the unidirectional pulsating DC voltage to output a smooth DC voltage.

Preferably, the filter module includes a filter capacitor and a bleeder resistor, and the filter capacitor and the bleeder resistor are connected in parallel at both ends of the light source module.

Preferably, the light source module includes one or more LED light emitters, the LED light emitters are connected in series or in parallel, and the rectification module includes a rectifier bridge.

The LED driving circuit of the utility model includes a rectifier module, a light source module and a constant current diode, the constant current diode is connected in series with the light source module, the constant current diode can output a constant current in a wide voltage range, and has a high dynamic impedance, Therefore, when the power supply voltage in the circuit is unstable, it can ensure the stability of the circuit current, provide a stable current for the light source module, make the light source module in the best working state, and provide lighting for users. The LED lamp of the present invention includes the above-mentioned LED driving circuit. The LED driving circuit replaces the existing LED driving circuit. The structure of the LED lamp does not require a driver, so that the volume of the LED lamp is reduced, the structure is simpler, and the cost is also reduced.

Description of drawings

Fig. 1 is a block diagram of the LED drive circuit in the first and second embodiments of the LED drive circuit of the present invention and an embodiment of the LED lamp;

Fig. 2 is a first embodiment of the LED driving circuit of the present invention and a diagram of the LED driving circuit in an embodiment of the LED lamp;

Fig. 3 is the LED driving circuit diagram in the second embodiment of the LED driving circuit of the present invention;

Fig. 4 is a schematic structural diagram of an LED lamp in an embodiment of the LED lamp of the present invention.

The realization of the purpose of the utility model, functional characteristics and advantages will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

Detailed ways

It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.

Referring to Fig. 1 and Fig. 2, propose the first embodiment of the LED driving circuit of the present invention, comprise the rectifying module 30 that rectifies the alternating current input from external power source 10, be connected at the rectifying module 30 two ends a light source module 50 and connect A constant current diode D1 is used between the rectifier module 30 and the light source module 50 to stabilize the current in the circuit. The anode of the rectifier module 30 is connected to the anode of the constant current diode D1, and the light source module 50 is connected in series with the constant current diode D1. The rectification module 30 includes a rectification bridge D0. The light source module 50 includes a plurality of LED luminous bodies L, and the LED luminous bodies L are connected to each other in series. The LED driving circuit also includes a circuit protection module 20, the circuit protection module 20 includes a fuse F1 and a varistor Rv for circuit protection, and the input AC power is input to the rectification module 30 after passing through the fuse F1 and the varistor Rv. The fuse F1 will be blown when the circuit is short-circuited, and acts as a short-circuit protection for the circuit. The varistor Rv can suppress transient overvoltage. When the voltage in the circuit is less than a certain threshold, the varistor Rv is equivalent to an insulator, and the current flowing through it is extremely small, which has no adverse effect on the normal operation of the circuit; When the voltage is greater than a certain threshold, the current flowing through it is extremely large, and the varistor Rv can pull down the excessive voltage to prevent the circuit from being damaged by excessive voltage, so that the subsequent circuit can work in a safe range.

The input AC power is rectified by the rectifier bridge D0, and then passes through a filtering module 40 for filtering the pulsating component in the unidirectional pulsating DC voltage to output a smooth DC voltage. The filter module 40 is connected in parallel with both ends of the light source module 50 . The filter module 40 includes a filter capacitor C1 and a bleeder resistor R2 , and the filter capacitor C1 and the bleeder resistor R2 are connected in parallel at both ends of the light source module 50 . The input alternating current passes through the rectification module 30 and the filter module 40 to output smooth direct current, and the direct current passes through the constant current diode D1, and the constant current diode D1 can output a constant current in a wide voltage range and has a high dynamic impedance, so When the power supply voltage supply in the circuit is unstable, it can ensure the stability of the circuit current, provide a stable current for the light source module 50, make the LED illuminant L of the light source module 50 in the best working state, and provide illumination for users.

Referring to Fig. 1 and Fig. 3, the second embodiment of the LED driving circuit of the present invention is proposed. This embodiment is basically the same as the first embodiment of the LED driving circuit, and the main difference is that the LED driving circuit includes several light sources The module 50 and several constant current diodes D1 connected in series with the light source module 50, one light source module 50 is connected in series with one constant current diode D1, and the light source modules 50 are connected in parallel with each other. Multiple light source modules 50 can emit light at the same time, even if one of the light source modules 50 is damaged, other light source modules 50 can continue to emit light. The effect of this embodiment is basically the same as that of the first embodiment of the LED driving circuit.

Referring to Fig. 1, Fig. 2 and Fig. 4, an embodiment of the LED lamp of the present invention is proposed, which includes a cylindrical heat sink 60, a circuit board 80 arranged on the upper end surface of the heat sink 60, and a cover on the light outlet. Shade 70. The circuit board 80 is connected to the external power source 10 through wires, and an LED driving circuit is arranged on the circuit board 80 . The LED drive circuit includes a rectifier module 30 for rectifying the input alternating current, a light source module 50 connected to both ends of the rectifier module 30, and a constant current diode connected between the rectifier module 30 and the light source module 50 for constant current in the circuit D1, the anode of the rectifier module 30 is connected to the anode of the constant current diode D1, and the light source module 50 is connected in series with the constant current diode D1. The rectification module 30 includes a rectification bridge D0. The light source module 50 includes a plurality of LED luminous bodies L, and the LED luminous bodies L are connected to each other in series. The LED driving circuit also includes a fuse F1 and a piezoresistor Rv for circuit protection, and the input AC power is input to the rectification module 30 after passing through the fuse F1 and the piezoresistor Rv. The fuse F1 will be blown when the circuit is short-circuited, and acts as a short-circuit protection for the circuit. The varistor Rv can suppress transient overvoltage. When the voltage in the circuit is less than a certain threshold, the varistor Rv is equivalent to an insulator, and the current flowing through it is extremely small, which has no adverse effect on the normal operation of the circuit; When the voltage is greater than a certain threshold, the current flowing through it is extremely large, and the varistor Rv can pull down the excessive voltage to prevent the circuit from being damaged by excessive voltage, so that the subsequent circuit can work in a safe range.

The input AC power is rectified by the rectifier bridge D0, and then passes through a filtering module 40 for filtering the pulsating component in the unidirectional pulsating DC voltage to output a smooth DC voltage. The filter module 40 is connected in parallel with both ends of the light source module 50 . The filter module 40 includes a filter capacitor C1 and a bleeder resistor R2 , and the filter capacitor C1 and the bleeder resistor R2 are connected in parallel at both ends of the light source module 50 . The input alternating current passes through the rectification module 30 and the filter module 40 to output smooth direct current, and the direct current passes through the constant current diode D1, and the constant current diode D1 can output a constant current in a wide voltage range and has a high dynamic impedance, so When the power supply voltage supply in the circuit is unstable, it can ensure the stability of the circuit current, provide a stable current for the light source module 50, make the LED illuminant L of the light source module 50 in the best working state, and provide illumination for users.

Therefore, the LED driving circuit replaces the existing LED driving circuit, and the structure of the LED lamp does not require a driver, so that the volume of the LED lamp is reduced, the structure is simpler, and the cost is also reduced.

The above descriptions are only preferred embodiments of the present utility model, and are not therefore limiting the patent scope of the present utility model. Any equivalent structure or equivalent process transformation made by using the specification of the utility model and the contents of the accompanying drawings may be directly or indirectly used in Other relevant technical fields are all included in the patent protection scope of the present utility model in the same way.

Claims (10)

1. led drive circuit; It is characterized in that; Comprise the alternating current to input carry out the rectification module of rectification, be connected at least one light source module at said rectification module two ends and be connected said rectification module and said light source module between be used for the current regulator diode of constant this circuit electric current, the positive pole of said rectification module is connected with the positive pole of said current regulator diode; Said current regulator diode of a said light source module series connection, parallel with one another between the said light source module.

2. led drive circuit according to claim 1 is characterized in that, the alternating current of input is the said rectification module of input after the fuse that is used for protective circuit, piezo-resistance.

3. led drive circuit according to claim 2 is characterized in that, comprises that also one is used for the filtration module of the flutter component of the unidirectional pulsating dc voltage of elimination with the output smoothing direct voltage.

4. led drive circuit according to claim 3 is characterized in that said filtration module comprises filter capacitor and bleeder resistance, said filter capacitor and the said bleeder resistance two ends at said light source module parallel with one another.

5. according to each described led drive circuit in the claim 1 to 4, it is characterized in that said light source module comprises one or more LED luminous elements, serial or parallel connection connects between the said LED luminous element, and said rectification module comprises rectifier bridge.

6. LED lamp; Comprise the circuit board and the led drive circuit that are connected with external power source through lead; It is characterized in that; Said led drive circuit is arranged on said circuit board; Said led drive circuit comprise the alternating current to input carry out the rectification module of rectification, be connected at least one light source module at said rectification module two ends and be connected said rectification module and said light source module between be used for the current regulator diode of constant this circuit electric current, the positive pole of said rectification module is connected with the positive pole of said current regulator diode; Said current regulator diode of a said light source module series connection, parallel with one another between the said light source module.

7. LED lamp according to claim 6 is characterized in that, the alternating current of input is the said rectification module of input after the fuse that is used for protective circuit, piezo-resistance.

8. LED lamp according to claim 7 is characterized in that, said led drive circuit comprises that also one is used for the filtration module of the flutter component of the unidirectional pulsating dc voltage of elimination with the output smoothing direct voltage.

9. LED lamp according to claim 8 is characterized in that said filtration module comprises filter capacitor and bleeder resistance, said filter capacitor and the said bleeder resistance two ends at said light source module parallel with one another.

10. according to each described LED lamp in the claim 6 to 9, it is characterized in that said light source module comprises one or more LED luminous elements, serial or parallel connection connects between the said LED luminous element, and said rectification module comprises rectifier bridge.

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