Lighting lamp protection driving circuit

Abstract

The utility model relates to the field of electronic circuits, and provides an illuminating lamp protection driving circuit, which comprises a first power supply, a power supply driving module, a second power supply, a standby circuit breaking module and an LED lamp group, the first power supply is connected with the input end of the power supply driving module, and the power supply driving module is used for controlling the voltage of the first power supply after the voltage of the first power supply is regulated. The first power supply is used for supplying power to the LED lamp set, the first end of the standby circuit breaking module is connected with the output end of the power supply driving module, the second end of the standby circuit breaking module is connected with the LED lamp set, the second power supply is connected with the control end of the standby circuit breaking module, and during working, the second power supply is powered on and controls the standby circuit breaking module to be switched on, so that the power supply driving module supplies power to the LED lamp set. In a standby state, the second power supply loses power, and the standby circuit breaking module is controlled to be disconnected, so that the LED lamp group is prevented from forming a loop; the utility model can prevent the lamp bead from slightly lighting, thereby improving the user experience.

Description

Technical Field

[0001] The utility model relates to the field of electronic circuits, and more specifically, to a protection driving circuit for a lighting lamp. Background Art

[0002] LEDs are known as the fourth-generation lighting sources or green light sources, which have the characteristics of energy saving, environmental protection, long lifespan, and small size, and can be widely used in various fields such as indication, display, decoration, backlight, general lighting, and urban night scenery. LED lamps are powered by a power supply driving circuit. Traditional non-isolated LED driving power supplies are grounded, specifically, the heat dissipation plate of the lamp is grounded. Parasitic capacitances are generated by the lamp beads and the heat dissipation plate of the lamp itself. Therefore, in the standby state with the light off (which means the main power supply is still powered), the input of the non-isolated power supply will form a leakage current path through the non-isolated driving power supply and the parasitic capacitance in the lamp. The leakage current flows through the LED lamp beads. In this case, the lamp beads will show a short-term faint glow when the light is turned off. Usually, this situation where the lamp beads still faintly glow after the light is turned off is called "ghost fire", resulting in extremely poor user experience. Summary of the Utility Model

[0003] The problem solved by the utility model is how to provide a driving circuit that can prevent the lamp beads from faintly glowing in the standby state with the LED lamp turned off.

[0004] To solve the above problem, the utility model provides a protection driving circuit for a lighting lamp, including: a first power supply, a power supply driving module, a second power supply, a standby open-circuit module, and an LED lamp group. The first power supply is connected to the input end of the power supply driving module. The power supply driving module is used to adjust the voltage of the first power supply and then supply power to the LED lamp group. The first end of the standby open-circuit module is connected to the output end of the power supply driving module, and the second end is connected to the LED lamp group. The second power supply is connected to the control end of the standby open-circuit module. During operation, when the second power supply is powered on, it controls the standby open-circuit module to conduct, enabling the power supply driving module to supply power to the LED lamp group. During standby, when the second power supply loses power, it controls the standby open-circuit module to disconnect, preventing the LED lamp group from forming a loop.

[0005] Further, the LED lamp group includes a first light-emitting diode and a second light-emitting diode connected in series.

[0006] Further, the power supply driving module includes a power supply driving chip, a first MOS transistor, a third diode, a first inductor, a first capacitor and a second capacitor. The first capacitor and the second capacitor are polarized capacitors. The drain of the first MOS transistor is connected to the first power supply and the positive electrode of the first capacitor respectively, the source is connected to the first end of the first inductor and the cathode of the third diode respectively, and the gate is connected to the power supply driving chip. The negative electrode of the first capacitor is grounded. The second end of the first inductor is connected to the positive electrode of the second capacitor, the negative electrode of the second capacitor is connected to the anode of the third diode, and the anode of the third diode is grounded through a first resistor.

[0007] Further, a third capacitor is further included, and the first power supply is grounded through the third capacitor.

[0008] Further, the standby open - circuit module includes a first thyristor optocoupler, a first voltage - stabilizing diode and a second MOS transistor. The first pin of the first thyristor optocoupler is connected to the second power supply, the second pin is grounded, the third pin is connected to the first power supply, and the fourth pin is connected to the first voltage - stabilizing diode through a third resistor and a fourth resistor in sequence. The first pin and the second pin of the first thyristor optocoupler are the ports of the positive and negative electrodes of the light - emitting diode inside the first thyristor optocoupler, and the third pin and the fourth pin of the first thyristor optocoupler are the ports of both ends of the thyristor inside the first thyristor optocoupler. The gate of the second MOS transistor is connected to the first voltage - stabilizing diode, the drain is connected to the positive electrode of the second capacitor, and the source is connected to the positive electrode of the LED lamp group.

[0009] Further, the standby open - circuit module further includes a fourth diode. The anode of the fourth diode is connected to the negative electrode of the LED lamp group, and the cathode is grounded through the first resistor.

[0010] Further, the standby open - circuit module further includes an RC parallel circuit, and the RC parallel circuit is connected in parallel across both ends of the first voltage - stabilizing diode.

[0011] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0012] In the light - on state: The second power supply supplies power to the light - emitting diode in the first thyristor optocoupler. The light - emitting diode conducts, the thyristor in the thyristor optocoupler conducts, the first voltage - stabilizing diode clamps the voltage, the gate of the second MOS transistor has voltage, the second MOS transistor conducts, the fourth diode conducts, and the first power supply supplies power to the light - emitting diodes in the LED lamp group through the power supply driving module, and the lamp beads of the light - emitting diodes emit light normally;

[0013] In the state of turning off the light and standby (which means the power module still has power): the second power supply does not supply power, the light-emitting diode in the first thyristor optocoupler is cut off, the thyristor in the first thyristor optocoupler is turned off, the first voltage regulator diode does not work, and the second MOS transistor is cut off. Therefore, even if the lamp beads and the heat dissipation plate of the lamp fixture generate parasitic capacitance themselves, in the state of turning off the light and standby, since the loop is disconnected, a weak leakage current will not be generated in the circuit. Therefore, the leakage current generated between the first power supply and the lamp fixture housing (the housing is connected to the ground) in the standby state of the LED driving power supply can be eliminated, thereby preventing the "ghost fire" phenomenon and improving the user experience. Description of the Drawings

[0014] Figure 1 It is a schematic diagram of the overall principle structure of an embodiment of the present invention;

[0015] Figure 2 It is a schematic diagram of the overall circuit principle of an embodiment of the present invention. Detailed Embodiments

[0016] In order to make the above objects, features, and advantages of the present invention more obvious and understandable, the following will describe the specific embodiments of the present invention in detail with reference to the accompanying drawings.

[0017] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "set", "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0018] In the description of this specification, the descriptions referring to terms such as "embodiment", "one embodiment", and "one embodiment mode" mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or embodiment mode are included in at least one embodiment or embodiment mode of the present invention. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or embodiment mode. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or embodiment modes.

[0019] Such as Figure 1As shown in the figure, the present utility model provides a protection driving circuit for a lighting lamp, comprising: a first power supply, a power supply driving module, a second power supply, a standby open circuit module, and an LED lamp group. The first power supply is connected to the input end of the power supply driving module. The power supply driving module is used to regulate the voltage of the first power supply and then supply power to the LED lamp group. The first end of the standby open circuit module is connected to the output end of the power supply driving module, and the second end is connected to the LED lamp group. The second power supply is connected to the control end of the standby open circuit module. During operation, when the second power supply is powered on, it controls the standby open circuit module to conduct, enabling the power supply driving module to supply power to the LED lamp group. During standby, when the second power supply loses power, it controls the standby open circuit module to disconnect, preventing the LED lamp group from forming a loop.

[0020] It should be noted that the first power supply is the main power supply. In the state of turning off the light and standby, the first power supply still has power and does not supply power to the subsequent lamps through the power supply driving module. The second power supply is used to supply power to the standby open circuit module. The second power supply can be obtained by voltage conversion from the first power supply or can be supplied independently. The second power supply can be controlled by a control chip or a switch. In the standby state, the connection between the power supply and the second power supply is synchronously cut off, making the second power supply in a power-off state, and then enabling the standby open circuit module. The LED lamp group can be composed of multiple light-emitting diodes. In Figure 2 the example, the LED lamp group is composed of two light-emitting diodes, namely the first light-emitting diode D1 and the second light-emitting diode D2.

[0021] In an embodiment of the present utility model, as Figure 2 shown in the figure, the power supply for supplying power to the subsequent LED lamp group includes a first power supply HV and a power supply driving module. The power supply driving module includes a power supply driving chip, a first MOS transistor Q1, a third diode D3, a first inductor L5, a first capacitor C1, and a second capacitor C2. The first capacitor C1 and the second capacitor C2 are polarized capacitors. The drain of the first MOS transistor Q1 is respectively connected to the first power supply HV and the positive electrode of the first capacitor C1. The source is respectively connected to the first end of the first inductor L5 and the cathode of the third diode D3. The gate is connected to the power supply driving chip. HO is the control signal of the power supply driving chip for the first MOS transistor Q1. The negative electrode of the first capacitor C1 is grounded. The second end of the first inductor L1 is connected to the positive electrode of the second capacitor C2. The negative electrode of the second capacitor C2 is connected to the anode of the third diode D3. The anode of the third diode D3 is grounded through a first resistor R1.

[0022] In this embodiment, the first inductor L5 and the second capacitor C2 play a role in energy storage. The first inductor L5 can store energy when the first MOS transistor Q1 is turned on and discharge in the reverse direction when the first MOS transistor Q1 is turned off. By varying the given control signal HO, the charge and discharge state of the circuit can be adjusted, thereby changing the positive terminal voltage of the second capacitor C2. The positive terminal voltage of the second capacitor C2 is the output voltage of the subsequent stage. In the existing circuit, the output voltage is usually directly connected to the subsequent stage LED lamp group, so that the voltage regulation and stabilization of the LED lamp group can be achieved. The first resistor R1 is arranged in the lamp group loop to play a role in current limiting and protection.

[0023] However, when directly outputting the output voltage of the subsequent stage to the LED lamp group through the power supply driving module, in the standby state, the power supply driving module does not work, but the first power supply HV still has electricity and has a corresponding potential difference with the ground. Moreover, the lamp beads and the heat dissipation plate of the lamp fixture will generate parasitic capacitance by themselves, which is equivalent to the LED lamp group being connected to the ground through the parasitic capacitance. In this way, the generated leakage current forms a loop through the power supply driving module, the lamp beads, and the parasitic capacitance. Therefore, it is necessary to disconnect this loop during standby to avoid the generation of the ghost fire phenomenon.

[0024] In an embodiment of the present utility model, as Figure 2As shown, a standby open circuit module is provided between the power supply driving module and the LED lamp group. The standby open circuit module includes a second power supply VCC and a first silicon-controlled optocoupler U1. The first silicon-controlled optocoupler U1 includes a light-emitting diode and a silicon-controlled rectifier inside. One end of the fifth resistor R5 is connected to the second power supply VCC, and the other end of the fifth resistor R5 is connected to the anode of the light-emitting diode of the silicon-controlled optocoupler U1. When the light is on, the second power supply VCC is powered on to provide a low voltage for the light-emitting diode of the first silicon-controlled optocoupler U1, so that the light-emitting diode of the first silicon-controlled optocoupler U1 conducts. In the standby state with the light off, the second power supply VCC is not powered, so that the light-emitting diode of the first silicon-controlled optocoupler U1 is cut off, and the cathode of the light-emitting diode inside the first silicon-controlled optocoupler U1 is grounded. One pin of the silicon-controlled rectifier in the first silicon-controlled optocoupler U1 is connected to the first power supply HV, and the other pin is connected to the cathode of the first zener diode ZD1 after being connected in series with the fourth resistor R4 and the third resistor R3. The cathode of the first zener diode ZD1 is also connected to the gate of the second MOS transistor Q2, and the anode of the first zener diode ZD1 is connected to the source of the second MOS transistor Q2. An RC parallel circuit is connected in parallel between the anode and the cathode of the first zener diode. Specifically, the RC parallel circuit includes a second resistor R2 and a fifth capacitor C5 connected in parallel. One end of the RC parallel circuit is connected to the line between the third resistor R3 and the cathode of the first zener diode ZD1, and the other end of the RC parallel circuit is connected to the anode of the first zener diode ZD1. The first zener diode ZD1 plays a clamping role, and can provide a stable conduction voltage for the gate of the second MOS transistor Q2 when the second power supply VCC is powered on, so that the second MOS transistor Q2 conducts. In the standby state with the light off, the second power supply VCC is not powered, and the second MOS transistor Q2 is in an off state, blocking the leakage current.

[0025] The drain of the second MOS transistor Q2 is connected to the positive electrode of the second capacitor C2, and the source is connected to the anode of the first light-emitting diode D1 for lighting. The cathode of the second light-emitting diode D2 is connected to the anode of the fourth diode D4, and the cathode of the fourth diode D4 is connected back to the power supply module. When the light is on, a loop is formed among the second MOS transistor Q2, the second capacitor C2, the fourth diode D4, the first light-emitting diode D1 and the second light-emitting diode D2, so that the first light-emitting diode D1 and the second light-emitting diode D2 are normally lit.

[0026] In this embodiment, a fourth capacitor C4 is also connected between the source of the second MOS transistor Q2 and the anode of the fourth diode Q4. The fourth capacitor C4 is connected in parallel with both the first light-emitting diode D1 and the second light-emitting diode D2 for lighting. The function of the fourth capacitor C4 is to act as a bypass capacitor and play a role in bypass decoupling.

[0027] Although the present disclosure is disclosed as above, the scope of protection of the present disclosure is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present disclosure, and these changes and modifications will all fall within the scope of protection of the present utility model.

Claims

1. A lighting protection drive circuit, characterized in that, Comprising: A first power supply, a power supply driving module, a second power supply, a standby open-circuit module, and an LED lamp group. The first power supply is connected to the input end of the power supply driving module. The power supply driving module is used to adjust the voltage of the first power supply and then supply power to the LED lamp group. The first end of the standby open-circuit module is connected to the output end of the power supply driving module, and the second end is connected to the LED lamp group. The second power supply is connected to the control end of the standby open-circuit module. During operation, the second power supply is powered on to control the standby open-circuit module to conduct, enabling the power supply driving module to supply power to the LED lamp group. During standby, the second power supply loses power to control the standby open-circuit module to disconnect, preventing the LED lamp group from forming a loop.

2. The lighting protection drive circuit according to claim 1, wherein The LED lamp group includes a first light-emitting diode and a second light-emitting diode connected in series.

3. The lighting protection drive circuit according to claim 1, wherein The power supply driving module includes a power supply driving chip, a first MOS transistor, a third diode, a first inductor, a first capacitor, and a second capacitor. The first capacitor and the second capacitor are polar capacitors. The drain of the first MOS transistor is respectively connected to the first power supply and the positive electrode of the first capacitor. The source is respectively connected to the first end of the first inductor and the cathode of the third diode. The gate is connected to the power supply driving chip. The negative electrode of the first capacitor is grounded. The second end of the first inductor is connected to the positive electrode of the second capacitor. The negative electrode of the second capacitor is connected to the anode of the third diode. The anode of the third diode is grounded through a first resistor.

4. The lighting protection drive circuit according to claim 3, characterized in that, It further includes a third capacitor. The first power supply is connected to the ground wire through the third capacitor.

5. The lighting protection driving circuit according to claim 4, characterized in that The standby open-circuit module includes a first thyristor optocoupler, a first voltage regulator diode, and a second MOS transistor. The first pin of the first thyristor optocoupler is connected to the second power supply, the second pin is grounded, the third pin is connected to the first power supply, and the fourth pin is sequentially connected to the first voltage regulator diode through a third resistor and a fourth resistor. The first pin and the second pin of the first thyristor optocoupler are the ports of the positive and negative electrodes of the light-emitting diode inside the first thyristor optocoupler. The third pin and the fourth pin of the first thyristor optocoupler are the ports of both ends of the thyristor inside the first thyristor optocoupler. The gate of the second MOS transistor is connected to the first voltage regulator diode, the drain is connected to the positive electrode of the second capacitor, and the source is connected to the positive electrode of the LED lamp group.

6. The lighting protection driving circuit according to claim 5, wherein The standby open-circuit module further includes a fourth diode. The anode of the fourth diode is connected to the negative electrode of the LED lamp group, and the cathode is grounded through the first resistor.

7. The lighting protection drive circuit according to claim 6, characterized in that, The standby open-circuit module further includes an RC parallel circuit. The RC parallel circuit is connected in parallel across both ends of the first voltage regulator diode.

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