Dimmable LED lamp circuit without electric contact

Abstract

The utility model discloses a dimmable LED lamp circuit without an electric contact, which comprises a wireless receiving circuit, a control circuit, a driving circuit and an LED light emitting circuit, and is characterized in that the wireless receiving circuit comprises a receiving coil and is used for converting electric energy generated by the receiving coil into direct-current voltage; the maximum value of the direct-current voltage is smaller than the working voltage of the LED light-emitting circuit, the control circuit is used for controlling the driving circuit to convert the direct-current voltage accessed by the driving circuit into corresponding direct current and driving the LED light-emitting circuit to emit light, a time threshold value is set at the position of the control circuit, and the control circuit can further detect whether the receiving coil generates electric energy or not. When the receiving coil does not generate electric energy for a short time within a time threshold, the magnitude of the direct current output by the driving circuit is controlled to change; the dimmable LED lamp circuit without the electric contact has the advantages that the dimmable LED lamp without the electric contact is realized by adopting the dimmable LED lamp circuit without the electric contact, and the dimmable LED lamp can be dimmed even if an adjusting switch is not arranged.

Description

Technical Field

[0001] The utility model relates to a dimmable LED lamp circuit, in particular to a dimmable LED lamp circuit without electrical contacts. Background Art

[0002] LED lamps without electrical contacts are often used in combination with wireless power supply modules. Although there is no electrode contact between these two electrical devices, namely the LED lamp without electrical contacts and the wireless power supply module, the LED lamp without electrical contacts can receive the electrical energy emitted by the wireless power supply module to drive the LED light-emitting body inside it to emit light.

[0003] In the existing wireless power supply module, a transmitting coil is provided inside. A receiving coil is provided inside the LED lamp without electrical contact. The wireless power supply module converts the voltage it accesses into a high-frequency changing current to drive the electromagnetic signal emission of the transmitting coil inside it. When the receiving coil inside the LED lamp without electrical contact approaches the transmitting coil inside the wireless power supply device, the receiving coil can sense the electromagnetic signal emitted by the transmitting coil to generate electrical energy. At this time, after the LED lamp without electrical contact converts this electrical energy, it drives the LED light-emitting body inside it to emit light.

[0004] Since there are no problems such as electric leakage and electrode corrosion at the electrode contact points in the LED lamp without electrical contacts, which affect safety and service life, it has been widely used in application scenarios with a humid environment. However, in order to ensure its sealing and waterproof performance, the existing LED lamp without electrical contact usually does not have an adjustment switch on its surface, so it does not have a dimming function, resulting in a relatively single light-emitting mode. Summary of the Invention

[0005] The technical problem to be solved by the utility model is to provide a dimmable LED lamp circuit without electrical contacts with a dimming function. The dimmable LED lamp without electrical contacts implemented by using the dimmable LED lamp circuit without electrical contacts can be dimmed even without an adjustment switch.

[0006] The technical solution adopted by the present invention to solve the above-mentioned technical problems is: a dimmable LED lamp circuit without electrical contacts, comprising a wireless receiving circuit, a control circuit, a driving circuit and an LED light-emitting circuit. The wireless receiving circuit includes a receiving coil for sensing the electromagnetic signal generated by the transmitting coil of a wireless power supply device to generate electrical energy. The wireless receiving circuit is used to convert the electrical energy generated by the receiving coil into a DC voltage and output it to the control circuit and the driving circuit. The maximum DC voltage output by the wireless receiving circuit is less than the operating voltage of the LED light-emitting circuit. The control circuit is used to control the driving circuit to convert the DC voltage connected to it into a corresponding DC current to drive the LED light-emitting circuit to emit light. The control circuit is provided with a time threshold. The control circuit can also detect whether the receiving coil is generating electrical energy. When the receiving coil does not generate electrical energy for a short period of time less than the time threshold, the control circuit controls the DC current output by the driving circuit to change, thereby changing the luminous intensity of the LED light-emitting circuit.

[0007] The LED light-emitting circuit has a positive pole and a negative pole, the wireless receiving circuit has a positive output terminal, a negative output terminal and a power-on status terminal, the power-on status terminal of the wireless receiving circuit is used to output an electrical signal indicating whether the receiving coil generates electrical energy, and the positive output terminal and the negative output terminal of the wireless receiving circuit are used to output a DC voltage obtained by converting the electrical energy generated by the receiving coil. The control circuit has a positive pole, a negative pole, a detection terminal and an output terminal, and the drive circuit has a positive pole, a negative pole, a control terminal and an output terminal. The positive pole of the LED light-emitting circuit is connected to the output terminal of the drive circuit, the control terminal of the drive circuit is connected to the output terminal of the control circuit, the detection terminal of the control circuit is connected to the power-on status terminal of the wireless receiving circuit, the positive pole of the drive circuit, the positive pole of the control circuit are connected to the positive output terminal of the wireless receiving circuit, and the negative pole of the LED light-emitting circuit, the negative pole of the drive circuit, the negative pole of the control circuit and the negative output terminal of the wireless receiving circuit are connected.

[0008] The wireless receiving circuit also includes a first capacitor, a second capacitor and a first diode, the second capacitor is an electrolytic capacitor, the first diode is a rectifier diode, one end of the receiving coil, one end of the first capacitor and the positive electrode of the first diode are connected, and the connection end is the power-on state end of the wireless receiving circuit, the negative electrode of the first diode is connected to the positive electrode of the second capacitor, and the connection end is the positive output end of the wireless receiving circuit, the other end of the receiving coil, the other end of the first capacitor and the negative electrode of the second capacitor are connected, and the connection end is the negative output end of the wireless receiving circuit.

[0009] The control circuit includes a first integrated circuit of model S4165M, a first resistor, a second resistor, a third resistor, a third capacitor and a fourth capacitor. One end of the first resistor is the detection end of the control circuit, and the other end of the first resistor is connected to the CLK pin of the first integrated circuit. One end of the second resistor is the positive pole of the control circuit, and the other end of the second resistor, one end of the third capacitor, the VCC pin and the SET2 pin of the first integrated circuit are connected. One end of the fourth capacitor, one end of the third resistor and the SET1 pin of the first integrated circuit are connected. The other end of the third resistor, the other end of the third capacitor, the other end of the fourth capacitor and the GND pin of the first integrated circuit are connected, and the connection end is the negative pole of the control circuit. The PWM pin of the first integrated circuit is the output end of the control circuit.

[0010] The drive circuit includes a second integrated circuit of model BP1808, a second diode, a fifth capacitor, a sixth capacitor, a seventh capacitor, an eighth capacitor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor and an inductor. The second diode is a rectifier diode, and the fifth capacitor is an electrolytic capacitor. One end of the inductor is connected to the positive pole of the fifth capacitor, and the connection end is the positive pole of the drive circuit. The other end of the inductor, the positive pole of the second diode and the SW pin of the second integrated circuit are connected. The negative pole of the second diode, one end of the fifth resistor, one end of the sixth resistor, one end of the eighth capacitor and the VOUT pin of the second integrated circuit are connected. The other end of the fifth resistor is connected to the CS pin of the second integrated circuit, and the connection end is the output end of the drive circuit. The other end of the sixth resistor, one end of the seventh resistor and the OVP pin of the second integrated circuit are connected. One end of the fourth resistor is connected to the COMP pin of the second integrated circuit. The other end of the fourth resistor and one end of the sixth capacitor are connected. One end of the seventh capacitor is connected to the VDD pin of the second integrated circuit. The negative pole of the fifth capacitor, the other end of the sixth capacitor, the other end of the seventh capacitor, the other end of the eighth capacitor, the other end of the seventh resistor and the GND pin of the second integrated circuit are connected, and the connection end is the negative pole of the drive circuit. The PWM pin of the second integrated circuit is the control end of the drive circuit.

[0011] Compared with the prior art, the advantage of the present invention is that by setting a time threshold at the control circuit, the control circuit can also detect whether the receiving coil generates electrical energy, and when the receiving coil does not generate electrical energy for a short period of time less than the time threshold, the DC current output by the control driving circuit is changed, so that the luminous intensity of the LED light-emitting circuit changes. By operating the power switch of the wireless power supply module or changing the distance between the receiving coil and the transmitting coil of the wireless power supply module, the state of the receiving coil generating electrical energy can be controlled. Therefore, the dimmable LED lamp without electrical contacts implemented by the dimmable LED lamp circuit without electrical contacts of the present invention can be dimmed even without an additional adjustment switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a structural block diagram of the dimmable LED lamp circuit without electrical contacts of the present invention;

[0013] Figure 2 This is a circuit diagram of a dimmable LED lamp circuit without electrical contacts of the present invention. DETAILED DESCRIPTION

[0014] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0015] Example 1: Figure 1 As shown, a dimmable LED lamp circuit without electrical contacts includes a wireless receiving circuit, a control circuit, a drive circuit and an LED light-emitting circuit. The wireless receiving circuit includes a receiving coil T1 for sensing the electromagnetic signal generated by the transmitting coil of the wireless power supply device to generate electrical energy. The wireless receiving circuit is used to convert the electrical energy generated by the receiving coil T1 into a DC voltage and output it to the control circuit and the drive circuit. The maximum DC voltage output by the wireless receiving circuit is less than the operating voltage of the LED light-emitting circuit. The control circuit is used to control the drive circuit to convert the DC voltage it receives into a corresponding DC current to drive the LED light-emitting circuit to emit light. A time threshold is set at the control circuit. The control circuit can also detect whether the receiving coil T1 is generating electrical energy. When the receiving coil T1 does not generate electrical energy for a short period of time less than the time threshold, the control circuit controls the DC current output by the drive circuit to change, thereby changing the luminous intensity of the LED light-emitting circuit.

[0016] In this embodiment, the state of the receiving coil T1 generating electrical energy can be controlled by operating the power switch of the wireless power supply module or changing the distance between the receiving coil T1 and the transmitting coil of the wireless power supply module. Therefore, the dimmable LED lamp without electrical contacts implemented by the dimmable LED lamp circuit without electrical contacts of this embodiment can be dimmed by operating the power switch of the wireless power supply module or moving its position, even without an additional adjustment switch.

[0017] Embodiment 2: This embodiment is basically the same as Embodiment 1, with the difference that: in this embodiment, the LED lighting circuit has a positive electrode and a negative electrode, the wireless receiving circuit has a positive output terminal, a negative output terminal, and a power connection status terminal. The power connection status terminal of the wireless receiving circuit is used to output an electrical signal indicating whether the receiving coil T1 generates electrical energy. Between the positive output terminal and the negative output terminal of the wireless receiving circuit, a DC voltage obtained by converting the electrical energy generated by the receiving coil T1 is output. The control circuit has a positive electrode, a negative electrode, a detection terminal, and an output terminal. The driving circuit has a positive electrode, a negative electrode, a control terminal, and an output terminal. The positive electrode of the LED lighting circuit is connected to the output terminal of the driving circuit. The control terminal of the driving circuit is connected to the output terminal of the control circuit. The detection terminal of the control circuit is connected to the power connection status terminal of the wireless receiving circuit. The positive electrodes of the driving circuit, the control circuit, and the positive output terminal of the wireless receiving circuit are connected. The negative electrodes of the LED lighting circuit, the driving circuit, the control circuit, and the negative output terminal of the wireless receiving circuit are connected.

[0018] In the contactless dimmable LED lamp circuit of this embodiment, when the receiving coil T1 generates electrical energy, the power connection status terminal of the wireless receiving circuit outputs an electrical signal with a non-zero magnitude. When the receiving coil T1 does not generate electrical energy, the power connection status terminal of the wireless receiving circuit outputs an electrical signal with a magnitude of zero. When the electrical signal received by the detection terminal of the control circuit changes from a non-zero magnitude to a zero magnitude and then from a zero magnitude to a non-zero magnitude, if the time when the electrical signal has a zero magnitude is less than the time threshold, it indicates that the receiving coil T1 has a short-term situation of not generating electrical energy within less than the time threshold. The electrical signal output by the output terminal of the control circuit changes relative to the electrical signal output when the magnitude was non-zero the previous time, and the magnitude of the DC current output by the control driving circuit changes. If the time when the electrical signal has a zero magnitude is greater than or equal to the time threshold, then when the electrical signal changes from a zero magnitude to a non-zero magnitude, the electrical signal output by the output terminal of the control circuit is the same as the electrical signal output when the magnitude was non-zero the previous time.

[0019] The working principle of the contactless dimmable LED lamp circuit in this embodiment is as follows: When the receiving coil T1 does not generate electrical energy, there is no DC voltage output between the positive output terminal and the negative output terminal of the wireless receiving circuit, that is, the magnitude of the output DC voltage is zero. At this time, the DC voltage connected between the positive and negative poles of the driving circuit is zero, and the DC current output at its output terminal is zero, so the LED lighting circuit does not emit light. When the receiving coil T1 generates electrical energy, the wireless receiving circuit outputs a DC voltage between its positive output terminal and negative output terminal. The positive and negative poles of the control circuit are connected to the DC voltage output between the positive output terminal and negative output terminal of the wireless receiving circuit, and a corresponding electrical signal is output at its output terminal. The positive and negative poles of the driving circuit are connected to the DC voltage output between the positive output terminal and negative output terminal of the wireless receiving circuit, and under the control of the electrical signal connected to its control terminal, the voltage connected between its positive and negative poles is converted into a corresponding DC current and output at its output terminal to drive the LED lighting circuit to emit light. During the process of the LED lighting circuit emitting light, if the wireless power supply module is briefly powered off (the power-off time is less than the time threshold), at this time its transmitting coil briefly stops transmitting electromagnetic signals, or the receiving coil T1 moves with the movement of the contactless dimmable LED lamp, changing from being able to sense the electromagnetic signals transmitted by the transmitting coil to being unable to sense the electromagnetic signals transmitted by the transmitting coil for a short time (less than the time threshold), and then changing to being able to sense the electromagnetic signals transmitted by the transmitting coil again. When the receiving coil T1 changes from being unable to sense the electromagnetic signals transmitted by the transmitting coil to being able to sense the electromagnetic signals transmitted by the transmitting coil again, the wireless receiving circuit will output an electrical signal with a magnitude of zero at its power connection status terminal, the electrical signal output at the output terminal of the control circuit will change correspondingly, the control terminal of the driving circuit is connected to the corresponding electrical signal, the magnitude of the DC current output at the output terminal of the driving circuit changes, and the light intensity of the LED lighting circuit changes, realizing dimming.

[0020] Embodiment 3: This embodiment is basically the same as Embodiment 2, except that: In this embodiment, as Figure 2 shown, the wireless receiving circuit further includes a first capacitor C1, a second capacitor C2, and a first diode D1. The second capacitor C2 is an electrolytic capacitor, and the first diode D1 is a rectifier diode. One end of the receiving coil T1, one end of the first capacitor C1, and the positive pole of the first diode D1 are connected, and the connection end is the power connection status terminal of the wireless receiving circuit. The negative pole of the first diode D1 and the positive pole of the second capacitor C2 are connected, and the connection end is the positive output terminal of the wireless receiving circuit. The other end of the receiving coil T1, the other end of the first capacitor C1, and the negative pole of the second capacitor C2 are connected, and the connection end is the negative output terminal of the wireless receiving circuit.

[0021] Embodiment 4: This embodiment is basically the same as Embodiment 2, except that: In this embodiment, as Figure 2As shown in the figure, the control circuit includes a first integrated circuit U1 of model S4165M, a first resistor R1, a second resistor R2, a third resistor R3, a third capacitor C3, and a fourth capacitor C4. One end of the first resistor R1 is the detection end of the control circuit, and the other end of the first resistor R1 is connected to the CLK pin of the first integrated circuit U1. One end of the second resistor R2 is the positive pole of the control circuit, and the other end of the second resistor R2, one end of the third capacitor C3, the VCC pin and the SET2 pin of the first integrated circuit U1 are connected. One end of the fourth capacitor C4, one end of the third resistor R3 and the SET1 pin of the first integrated circuit U1 are connected. The other end of the third resistor R3, the other end of the third capacitor C3, the other end of the fourth capacitor C4 and the GND pin of the first integrated circuit U1 are connected, and the connection end is the negative pole of the control circuit. The PWM pin of the first integrated circuit U1 is the output end of the control circuit.

[0022] In this embodiment, the control circuit has a memory function of the state before power-off after its positive and negative poles are powered off. When powered on next time, the electrical signal output by its output end is the electrical signal output when the LED lighting circuit emits light.

[0023] Embodiment 5: This embodiment is basically the same as Embodiment 2, except that: in this embodiment, as Figure 2 shown, the drive circuit includes a second integrated circuit of model BP1808, a second diode D2, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, and an inductor L1. The second diode D2 is a rectifier diode, and the fifth capacitor C5 is an electrolytic capacitor. One end of the inductor L1 is connected to the positive pole of the fifth capacitor C5, and the connection end is the positive pole of the drive circuit. The other end of the inductor L1, the positive pole of the second diode D2 and the SW pin of the second integrated circuit are connected. The negative pole of the second diode D2, one end of the fifth resistor R5, one end of the sixth resistor R6, one end of the eighth capacitor C8 and the VOUT pin of the second integrated circuit are connected. The other end of the fifth resistor R5 is connected to the CS pin of the second integrated circuit, and the connection end is the output end of the drive circuit. The other end of the sixth resistor R6, one end of the seventh resistor R7 and the OVP pin of the second integrated circuit are connected. One end of the fourth resistor R4 is connected to the COMP pin of the second integrated circuit, and the other end of the fourth resistor R4 is connected to one end of the sixth capacitor C6. One end of the seventh capacitor C7 is connected to the VDD pin of the second integrated circuit. The negative pole of the fifth capacitor C5, the other end of the sixth capacitor C6, the other end of the seventh capacitor C7, the other end of the eighth capacitor C8, the other end of the seventh resistor R7 and the GND pin of the second integrated circuit are connected, and the connection end is the negative pole of the drive circuit. The PWM pin of the second integrated circuit is the control end of the drive circuit.

[0024] In this embodiment, the driving circuit uses a PWM signal for dimming, which has the advantage of a large dimming depth.

Claims

1. A dimmable LED lamp circuit without electrical contacts, comprising a wireless receiving circuit, a control circuit, a drive circuit, and an LED light-emitting circuit, wherein the wireless receiving circuit includes a receiving coil for sensing an electromagnetic signal generated by a transmitting coil of a wireless power supply device to generate electrical energy, the wireless receiving circuit is configured to convert the electrical energy generated by the receiving coil into a DC voltage and output it to the control circuit and the drive circuit, wherein the maximum DC voltage output by the wireless receiving circuit is less than the operating voltage of the LED light-emitting circuit, the control circuit is configured to control the drive circuit to convert the DC voltage received therein into a corresponding DC current, thereby driving the LED light-emitting circuit to emit light, and is characterized in that A time threshold is set at the control circuit. The control circuit can also detect whether the receiving coil generates electrical energy, and when the receiving coil briefly stops generating electrical energy within a time shorter than the time threshold, it controls the magnitude of the direct current output by the drive circuit to change, so that the light-emitting intensity of the LED lighting circuit changes.

2. The dimmable LED lamp circuit without electrical contacts according to claim 1, characterized in that The LED lighting circuit has a positive electrode and a negative electrode. The wireless receiving circuit has a positive output terminal, a negative output terminal, and a power connection status terminal. The power connection status terminal of the wireless receiving circuit is used to output an electrical signal indicating whether the receiving coil generates electrical energy. The direct current voltage obtained by converting the electrical energy generated by the receiving coil is output between the positive output terminal and the negative output terminal of the wireless receiving circuit. The control circuit has a positive electrode, a negative electrode, a detection terminal, and an output terminal. The drive circuit has a positive electrode, a negative electrode, a control terminal, and an output terminal. The positive electrode of the LED lighting circuit is connected to the output terminal of the drive circuit. The control terminal of the drive circuit is connected to the output terminal of the control circuit. The detection terminal of the control circuit is connected to the power connection status terminal of the wireless receiving circuit. The positive electrode of the drive circuit, the positive electrode of the control circuit, and the positive output terminal of the wireless receiving circuit are connected. The negative electrode of the LED lighting circuit, the negative electrode of the drive circuit, the negative electrode of the control circuit, and the negative output terminal of the wireless receiving circuit are connected.

3. An adjustable light LED lamp circuit without electrical contacts according to claim 2, characterized in that The wireless receiving circuit further includes a first capacitor, a second capacitor, and a first diode. The second capacitor is an electrolytic capacitor, and the first diode is a rectifying diode. One end of the receiving coil, one end of the first capacitor, and the positive electrode of the first diode are connected, and the connection end is the power connection status terminal of the wireless receiving circuit. The negative electrode of the first diode is connected to the positive electrode of the second capacitor, and the connection end is the positive output terminal of the wireless receiving circuit. The other end of the receiving coil, the other end of the first capacitor, and the negative electrode of the second capacitor are connected, and the connection end is the negative output terminal of the wireless receiving circuit.

4. The adjustable light LED lamp circuit without electrical contacts according to claim 2, characterized in that The control circuit includes a first integrated circuit of model S4165M, a first resistor, a second resistor, a third resistor, a third capacitor, and a fourth capacitor. One end of the first resistor is the detection terminal of the control circuit, and the other end of the first resistor is connected to the CLK pin of the first integrated circuit. One end of the second resistor is the positive electrode of the control circuit, and the other end of the second resistor, one end of the third capacitor, the VCC pin and the SET2 pin of the first integrated circuit are connected. One end of the fourth capacitor, one end of the third resistor, and the SET1 pin of the first integrated circuit are connected. The other end of the third resistor, the other end of the third capacitor, the other end of the fourth capacitor, and the GND pin of the first integrated circuit are connected, and the connection end is the negative electrode of the control circuit. The PWM pin of the first integrated circuit is the output terminal of the control circuit.

5. The adjustable light LED lamp circuit without electrical contacts according to claim 2, characterized in that The described drive circuit includes a second integrated circuit of model BP1808, a second diode, a fifth capacitor, a sixth capacitor, a seventh capacitor, an eighth capacitor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, and an inductor. The second diode is a rectifier diode, and the fifth capacitor is an electrolytic capacitor. One end of the inductor is connected to the positive electrode of the fifth capacitor, and the connection end is the positive electrode of the drive circuit. The other end of the inductor, the positive electrode of the second diode, and the SW pin of the second integrated circuit are connected. The negative electrode of the second diode, one end of the fifth resistor, one end of the sixth resistor, one end of the eighth capacitor, and the VOUT pin of the second integrated circuit are connected. The other end of the fifth resistor is connected to the CS pin of the second integrated circuit, and the connection end is the output end of the drive circuit. The other end of the sixth resistor, one end of the seventh resistor, and the OVP pin of the second integrated circuit are connected. One end of the fourth resistor is connected to the COMP pin of the second integrated circuit. The other end of the fourth resistor is connected to one end of the sixth capacitor. One end of the seventh capacitor is connected to the VDD pin of the second integrated circuit. The negative electrode of the fifth capacitor, the other end of the sixth capacitor, the other end of the seventh capacitor, the other end of the eighth capacitor, the other end of the seventh resistor, and the GND pin of the second integrated circuit are connected, and the connection end is the negative electrode of the drive circuit. The PWM pin of the second integrated circuit is the control end of the drive circuit.

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