Dimmer and lamp thereof

Abstract

The present invention relates to a dimmer and a lamp thereof. The dimmer includes a rectifier filter module, a 5V voltage regulator module, a dimming control module, a wireless receiving module, an overcurrent detection module and a single-chip control module; the overcurrent detection module includes a control chip, a sampling circuit for collecting circuit current values, an operational amplifier circuit for calculating the sampled current signal and a comparison circuit for comparing the current signal with a set current value; the signal output end of the control chip is connected to the detection signal input end of the single-chip control module. The overcurrent detection module of the dimmer obtains the current of the lamp and compares it with the set current to know whether the lamp is in a short-circuit state. When the lamp is in a short-circuit state, the single-chip control module disconnects the connection with the dimming control module, that is, disconnects the connection between the dimmer and the lamp, so that the dimmer will not be damaged when the lamp is short-circuited.

Description

Technical Field

[0001] The present invention relates to the field of power dimming control, and more particularly to a dimmer and a lamp thereof. Background Art

[0002] At present, there are multiple dimming technologies for dimmers used in lamps, one of which is a dimmer that can control dimming through wireless signals. This type of dimmer can be dimmed remotely using a remote control, and there is no need to wire the dimmer, so it is more convenient to use. For example, the patent document with application number "CN201520755307.2" discloses a wireless dimming controller for LED lamps, which includes a power circuit module, a wireless receiving module, a single-chip control module and a dimming control module. The power circuit module outputs a rectified high voltage to the dimming control module and is connected to the lamp, and outputs a low voltage to the wireless receiving module and the single-chip control module through a low-voltage voltage stabilizing circuit. After the single-chip control module receives the control signal from the wireless receiving module, it outputs a PWM signal to the dimming control module to adjust the brightness of the lamp.

[0003] However, the above dimmer lacks detection and feedback of current signals. If a short circuit occurs in the lamp, the current of the dimmer will be overloaded, and the dimmer will be directly damaged, making the dimmer unusable. Summary of the invention

[0004] In order to overcome the problem in the prior art that a short circuit of a lamp may cause damage to a dimmer, the present invention provides a dimmer that detects the current in the circuit. When a short circuit occurs in the lamp, the dimmer stops outputting signals to avoid damage to the dimmer.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a dimmer can be used in lamps, lighting fixtures and other furniture lighting appliances, including a rectifier and filter module, a 5V voltage regulator module connected to the rectifier and filter module, a dimming control module connected to the rectifier and filter module, a wireless receiving module connected to the 5V voltage regulator module, an overcurrent detection module connected to the 5V voltage regulator module and a single-chip control module connected to the 5V voltage regulator module; the output end of the wireless receiving module is connected to the dimming signal input end of the single-chip control module, and the rectifier and filter module and the dimming control module are used to be connected to the lamp; the overcurrent detection module includes a control chip, a sampling circuit for collecting circuit current value, an operational amplifier circuit for operating the sampled current signal and a comparison circuit for comparing the current signal with a set current value; the signal output end of the control chip is connected to the detection signal input end of the single-chip control module.

[0006] The control chip sets a reference current value, which can be the rated current value of the lamp. After acquiring the working current of the lamp, the sampling circuit transmits the current signal to the operational amplifier circuit, which amplifies the current signal and transmits it to the control chip. The comparison circuit compares the preset reference current and the working current. When the working current is larger than the preset reference current, it indicates that the lamp is in a short-circuit state. The control chip outputs a high level to the microcontroller control module, causing the microcontroller control module to stop outputting signals to the dimming control module, thereby disconnecting the dimmer from the lamp. Even if a short circuit occurs in the lamp, the dimmer can be disconnected in time, so the lamp can avoid damage due to current overload.

[0007] Preferably, the sampling circuit includes a first sampling resistor R4 and a second sampling resistor R5 connected in parallel, one end of the first sampling resistor R4 is connected to the dimming control module and the current signal sampling point, and the other end is connected to the control chip and grounded. The dimming control module is connected to the lamp, so after the dimming control module and the control chip are connected through two parallel sampling resistors, current sampling is performed at the connection point where the parallel resistor and the dimming control module are connected, and the detected current value is the current value of the lamp.

[0008] Preferably, the operational amplifier circuit includes a third sampling resistor R11 connected to the sampling point and a first amplifier resistor R12 and a second amplifier resistor R13 connected in series to the control chip, and the input end of the second amplifier resistor R13 is connected to the output end of the third sampling resistor R11 and grounded. The third sampling resistor R11 is one of the branches of the operation method circuit, and is connected to the sampling point to obtain the current value of the lamp. The current value is amplified by adjusting the resistance values ​​of the first amplifier resistor R12 and the second amplifier resistor R13, and then recognized by the control chip, so that the control chip can obtain a clear current value of the lamp.

[0009] Preferably, the operational amplifier circuit further includes a voltage stabilizing diode ZD1 and a polarized capacitor C13 connected in parallel between the second amplifying resistor R13 and the third sampling resistor R11. The voltage stabilizing diode and the limiting capacitor filter the sampled lamp current value to prevent the lamp current value from being too high and causing damage to the overcurrent detection module.

[0010] Preferably, the output end of the second amplifying resistor R13 is connected to the control chip; the first amplifying resistor R12 and the second amplifying resistor R13 are both adjustable resistors. By adjusting the resistance of the first amplifying resistor R12 and the second amplifying resistor R13, the amplification level of the operational amplifier circuit can be adjusted.

[0011] Preferably, the comparison circuit includes a first reference resistor R9 and a second reference resistor R10, the input end of the first reference resistor is connected to the output end of the 5V voltage regulator module and the first reference capacitor C11, and the other end of the first reference capacitor C11 is grounded; the input end of the second reference resistor R10 is connected to the output end of the first reference resistor R9 and the control chip, and the output end is connected to the first sampling resistor R4.

[0012] Preferably, the comparison circuit further includes a second reference capacitor having one end connected to the input end of the first reference resistor R9 and the other end connected to the output end of the second reference resistor R10.

[0013] Preferably, the rectifier and filter module includes a bridge rectifier circuit and a half-wave rectifier circuit, the half-wave rectifier circuit is connected to the 5V voltage regulator module through the rectifier capacitor C1, and the output end of the bridge rectifier circuit is used to connect to the lamp. The power supply connected to the rectifier and filter module can be the mains power, and the bridge rectifier circuit is a full-wave rectifier, which can supply the mains power to the lamp. However, the mains power has an uncontrollable boost problem, which can easily cause the rectifier capacitor C1 to be damaged, making the 5V voltage regulator module unable to work, because the power supply is half-wave rectified by the half-wave rectifier circuit to reduce its voltage and avoid damage to the rectifier capacitor C1.

[0014] A lamp is also provided, comprising an LED lamp, wherein the LED lamp is connected to the above-mentioned dimmer, the output end of the bridge rectifier circuit is connected to the input end of the LED lamp, and the output end of the LED lamp is connected to the dimming control module.

[0015] Compared with the prior art, the beneficial effect of the present invention is that the overcurrent detection module of the dimmer obtains the current of the lamp and compares it with the set current to determine whether the lamp is in a short-circuit state. When the lamp is in a short-circuit state, the single-chip microcomputer control module disconnects the connection with the dimming control module, that is, disconnects the connection between the dimmer and the lamp, so that the dimmer will not be damaged when the lamp is short-circuited. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a module connection diagram of a dimmer of the present invention;

[0017] Figure 2 It is a circuit structure schematic diagram of a dimmer of the present invention;

[0018] Figure 3 It is a circuit structure schematic diagram of the overcurrent detection module of the present invention;

[0019] Figure 4 It is a schematic diagram of the circuit structure of the rectifier and filter module of the present invention;

[0020] Figure 5 It is a schematic diagram of module connection of a lamp of the present invention. DETAILED DESCRIPTION

[0021] The drawings are only for illustrative purposes and cannot be construed as limiting the present invention. To better illustrate the present embodiment, some parts of the drawings may be omitted, enlarged, or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions may be omitted in the drawings. The positional relationships described in the drawings are only for illustrative purposes and cannot be construed as limiting the present invention.

[0022] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "long", "short" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, they are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limitations on this patent. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0023] The technical solution of the present invention is further described in detail below through specific embodiments and in conjunction with the accompanying drawings:

[0024] Example 1

[0025] like Figure 1-2 The figure shows an embodiment of a dimmer, including a rectifier and filter module, a 5V voltage regulator module connected to the rectifier and filter module, a dimming control module connected to the rectifier and filter module, a wireless receiving module connected to the 5V voltage regulator module, an overcurrent detection module connected to the 5V voltage regulator module and a single-chip control module connected to the 5V voltage regulator module; the output end of the wireless receiving module is connected to the dimming signal input end of the single-chip control module, and the rectifier and filter module and the dimming control module are used to be connected to the lamp; the overcurrent detection module includes a control chip, a sampling circuit for collecting circuit current value, an operational amplifier circuit for operating the sampled current signal and a comparison circuit for comparing the current signal with a set current value; the signal output end of the control chip is connected to the detection signal input end of the single-chip control module.

[0026] like Figure 3 As shown, the control chip is IC1, which has 8 pins in total, among which pin 8 is the power input terminal, and pin 1 is connected to the microcontroller control module to output high and low level signals.

[0027] Specifically, the sampling circuit includes a first sampling resistor R4 and a second sampling resistor R5 connected in parallel, one end of the first sampling resistor R4 is connected to the dimming control module and the current signal sampling point, and the other end is connected to the No. 4 pin of the control chip IC1 and grounded. The dimming control module is connected to the lamp, so after the dimming control module and the control chip are connected through two parallel sampling resistors, current sampling is performed at the connection point where the parallel resistor and the dimming control module are connected, and the detected current value is the current value of the lamp.

[0028] The operational amplifier circuit includes a third sampling resistor R11, a first amplifying resistor R12, a second amplifying resistor R13, a voltage stabilizing diode ZD1 and a polar capacitor C13. The input end of the third sampling resistor R11 is connected to the sampling point, and the output end is connected to the input end of the voltage stabilizing diode ZD1 and the positive end of the polar capacitor C13 and then connected to pin 5 of the control chip IC1. The output end of the voltage stabilizing diode ZD1 and the negative end of the polar capacitor C13 are connected to the input end of the second amplifying resistor R13 and grounded; the output end of the second amplifying resistor R13 is connected to the input end of the first amplifying resistor R12 and pin 6 of the control chip IC1; the output end of the first amplifying resistor R12 is connected to pin 7 of the control chip IC1 and connected to the feedback point of the overcurrent detection module. Pin 3 of the control chip is also connected to the feedback point, that is, pin 3 of the control chip is connected to the output end of the first amplifying resistor R12.

[0029] The circuit where the third sampling resistor R11 is located is connected to the lamp current, and the lamp current is filtered by the voltage stabilizing diode ZD1 and the polarized capacitor C13, and then amplified by the first amplifying resistor R12 and the second amplifying resistor R13 to be recognized by the control chip.

[0030] The comparison circuit includes a first reference resistor R9, a second reference resistor R10, a first reference capacitor C11 and a second reference capacitor C12, the input end of the first reference resistor is connected to the output end of the 5V voltage regulator module and the first reference capacitor C11, and the other end of the first reference capacitor C11 is grounded; the input end of the second reference resistor R10 is connected to the output end of the first reference resistor R9 and the pin 2 of the control chip IC1, and the output end is connected to the first sampling resistor R4. One end of the second reference capacitor C12 is connected to the input end of the first reference resistor R9, and the other end is connected to the output end of the second reference resistor R10.

[0031] The working principle or workflow of the present invention: This embodiment is suitable for dimming various lamps, lighting fixtures and household lighting appliances with an input voltage of 85V-265V and a power of less than 1500W. A reference current value is set in the control chip IC1, and the current value can be the rated current value of the lamp. After obtaining the working current of the lamp, the sampling circuit transmits the current signal to the operational amplifier circuit, and the operational amplifier circuit amplifies the current signal and transmits it to the control chip. The comparison circuit compares the preset reference current and the working current. When the working current is larger than the preset reference current, it indicates that the lamp is in a short-circuit state. The control chip outputs a high level to the single-chip control module, so that the single-chip control module stops the signal output to the dimming control module, thereby disconnecting the dimmer from the lamp. Even if a short circuit occurs in the lamp, the dimmer can be disconnected in time, so the lamp can avoid damage due to current overload.

[0032] The beneficial effects of this embodiment are as follows: the overcurrent detection module of the dimmer obtains the current of the lamp and compares it with the set current to determine whether the lamp is in a short-circuit state. When the lamp is in a short-circuit state, the single-chip control module disconnects the connection with the dimming control module, that is, disconnects the connection between the dimmer and the lamp, so that the dimmer will not be damaged when the lamp is short-circuited.

[0033] Example 2

[0034] like Figure 4 Another embodiment of a dimmer is shown. The difference between this embodiment and embodiment 1 is that the rectification and filtering module is further limited.

[0035] Specifically, the rectifier and filter module includes a bridge rectifier circuit and a half-wave rectifier circuit. The half-wave rectifier circuit is connected to the 5V voltage regulator module through the rectifier capacitor C1, and the output end of the bridge rectifier circuit is used to connect to the lamp. The power supply connected to the rectifier and filter module can be AC ​​power. The bridge rectifier circuit is a full-wave rectifier, which can supply AC power to the lamp. However, there is an uncontrollable voltage boost problem in the AC power supply, which can easily cause damage to the rectifier capacitor C1, making the 5V voltage regulator module unable to work, because the power supply is half-wave rectified by the half-wave rectifier circuit to reduce its voltage and avoid damage to the rectifier capacitor C1.

[0036] Example 3

[0037] like Figure 5 An embodiment of a lamp is shown, including an LED lamp, the LED lamp is connected to the dimmer of embodiment 1 or 2, the output end of the bridge rectifier circuit is connected to the input end of the LED lamp, and the output end of the LED lamp is connected to the dimming control module.

[0038] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A dimmer, comprising a rectifier and filter module, a 5V voltage regulator module connected to the rectifier and filter module, a dimming control module connected to the rectifier and filter module, a wireless receiving module connected to the 5V voltage regulator module, and a single-chip microcomputer control module connected to the 5V voltage regulator module; the output end of the wireless receiving module is connected to the dimming signal input end of the single-chip microcomputer control module, the rectifier and filter module and the dimming control module are used to connect to a lamp, characterized in that: It also includes an overcurrent detection module connected to the 5V voltage stabilizing module; the overcurrent detection module includes a control chip, a sampling circuit for collecting the current value of the circuit, an operational amplifier circuit for operating the sampled current signal, and a comparison circuit for comparing the current signal with the set current value; the signal output end of the control chip is connected to the detection signal input end of the single-chip control module; The sampling circuit includes a first sampling resistor R4 and a second sampling resistor R5 connected in parallel, one end of the first sampling resistor R4 is connected to the dimming control module and the current signal sampling point, and the other end is connected to the control chip and grounded; and the other end of the first sampling resistor R4 is connected to pin 4 of the IC1 chip and grounded; The operational amplifier circuit includes a third sampling resistor R11 connected to the sampling point and a first amplifying resistor R12 and a second amplifying resistor R13 connected in series to the control chip, the input end of the second amplifying resistor R13 is connected to the output end of the third sampling resistor R11 and is grounded; the input end of the third sampling resistor R11 is connected to the sampling point, and the output end is connected to the input end of the voltage stabilizing diode ZD1 and the positive end of the polarized capacitor C13 and then connected to the pin 5 of the control chip IC1; the output end of the second amplifying resistor R13 is connected to the input end of the first amplifying resistor R12 and the pin 6 of the control chip IC1; the output end of the first amplifying resistor R12 is connected to the pin 7 of the control chip IC1 and is connected to the feedback point of the overcurrent detection module, and the pin 3 of the control chip IC1 is also connected to the feedback point; The operational amplifier circuit further includes a voltage stabilizing diode ZD1 connected between the second amplifying resistor R13 and the third sampling resistor R11; The voltage stabilizing diode ZD1 is connected in parallel with a polarity capacitor C13; the comparison circuit includes a first reference resistor R9 and a second reference resistor R10, the input end of the first reference resistor R9 is connected to the output end of the 5V voltage stabilizing module and the first reference capacitor C11, and the other end of the first reference capacitor C11 is grounded; the input end of the second reference resistor R10 is connected to the output end of the first reference resistor R9 and pin 2 of the control chip IC1, and the output end is connected to the first sampling resistor R4; when the single-chip microcomputer control module detects that pin 1 of the IC1 chip outputs a high-level signal, it disconnects from the dimming control module.

2. A dimmer according to claim 1, characterized in that: The output end of the second amplifying resistor R13 is connected to the control chip; the first amplifying resistor R12 and the second amplifying resistor R13 are both resistors with adjustable resistance values.

3. A dimmer according to claim 1, characterized in that: The comparison circuit further includes a second reference capacitor having one end connected to the input end of the first reference resistor R9 and the other end connected to the output end of the second reference resistor R10.

4. A dimmer according to any one of claims 1 to 3, characterized in that: The rectification and filtering module includes a bridge rectifier circuit and a half-wave rectifier circuit. The half-wave rectifier circuit is connected to a 5V voltage stabilizing module via a rectifier capacitor C1. The output end of the bridge rectifier circuit is used to connect to a lamp.

5. A lamp, comprising an LED lamp, characterized in that: The LED lamp is connected to the dimmer according to claim 4, the output end of the bridge rectifier circuit is connected to the input end of the LED lamp, and the output end of the LED lamp is connected to the dimming control module.

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