Dimming abnormal sound filtering power supply circuit and power supply device

Abstract

The utility model discloses a dimming abnormal sound filtering power supply circuit and a power supply device, comprising a rectification filtering module, a power supply modulation module and a low-pass filtering module, the input end of the rectification filtering module is used for being connected with a power supply, and the power supply modulation module comprises a power adjusting unit, a control unit and a sampling feedback unit. A voltage transformation assembly is arranged in the power adjusting unit, the input end of the power adjusting unit is connected with the output end of the rectification filtering module, and the output end of the power adjusting unit is used for being connected with a dimming load. The sampling end of the sampling feedback unit is connected with the output end of the power adjusting unit so as to be used for detecting a feedback signal representing output voltage, and the output end of the sampling feedback unit is connected with the control unit. The control unit is connected with the controlled end of the power adjusting unit to control the power adjusting unit to operate according to a feedback signal, the low-pass filtering module is connected with the sampling feedback unit to filter ripples of the feedback signal, and according to the design, abnormal noise is reduced, and power supply operation is stable and reliable.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic circuits, and particularly relates to a dimming abnormal sound filtering power supply circuit and a power supply device. Background Art

[0002] The existing dimming circuit generally includes a power supply driving circuit, a dimmer and a lamp. The power supply driving circuit can be a switching power supply circuit, and a voltage transformation component is arranged in the switching power supply circuit. The input voltage is transformed through the voltage transformation component to form a supply voltage and provided to the lamp load. Most dimmers perform PWM dimming on the LED lamp, and the dimming frequency ranges from 200HZ to 20KHZ. The supply voltage is provided to the dimmer, and the dimmer chops the supply voltage to obtain a PWM waveform to dim the LED lamp.

[0003] However, due to the PWM dimming of the dimmer, there will be a dimming signal with a fixed frequency. The frequencies corresponding to different dimmers range from 200HZ to 20KHZ. During dimming, this signal will generate a ripple signal, which is consistent with the dimming frequency. This ripple signal may invade the power supply driving circuit side, and the superposition of the ripple signals will cause the voltage transformation component to generate noises such as whistling. Summary of the Utility Model

[0004] The utility model aims to at least solve one of the technical problems existing in the prior art. For this purpose, the utility model provides a dimming abnormal sound filtering power supply circuit and a power supply device, which can reduce abnormal sounds and ensure stable and reliable power supply operation.

[0005] A dimming abnormal sound filtering power supply circuit according to an embodiment of the first aspect of the utility model includes: a rectification and filtering module, the input end of which is used to connect to a power supply; a power modulation module, including a power adjustment unit, a control unit and a sampling and feedback unit. A voltage transformation component is arranged in the power adjustment unit. The input end of the power adjustment unit is connected to the output end of the rectification and filtering module, and the output end of the power adjustment unit is used to connect to a dimming load. The sampling end of the sampling and feedback unit is connected to the output end of the power adjustment unit to detect a feedback signal representing the output voltage. The output end of the sampling and feedback unit is connected to the control unit, and the control unit is connected to the controlled end of the power adjustment unit to control the operation of the power adjustment unit according to the feedback signal; a low-pass filtering module, connected to the sampling and feedback unit to filter the ripple of the feedback signal.

[0006] A dimming abnormal sound filtering power supply circuit according to an embodiment of the utility model has at least the following beneficial effects:

[0007] The dimming abnormal noise filtering power supply circuit of the present utility model, the control unit controls the power adjustment unit to modulate the input voltage provided by the rectification and filtering module to form an output voltage. The sampling feedback unit samples the output voltage and forms a feedback signal to be provided to the control unit. The control unit controls the power adjustment unit according to the feedback signal, thereby controlling the magnitude of the output voltage. The output voltage is provided to the dimming load. The dimming load may generate a ripple signal during the dimming process. The ripple signal is superimposed on the output voltage and invades the power adjustment module. The low-pass filtering module can filter the ripple of the feedback signal. This design reduces abnormal noise and the power supply operation is stable and reliable.

[0008] According to some embodiments of the present utility model, the sampling feedback unit includes a resistive voltage dividing component and an optocoupler. The head end of the resistive voltage dividing component is connected to the output end of the power adjustment unit. The tail end of the resistive voltage dividing component is grounded. The voltage dividing end of the resistive voltage dividing component is connected to the light emitting component of the optocoupler. The light receiving component of the optocoupler is connected to the control unit. The low-pass filtering module is connected to the resistive voltage dividing component.

[0009] According to some embodiments of the present utility model, the resistive voltage dividing component includes resistor R4 and resistor R7. One end of resistor R4 is respectively connected to the output end of the power adjustment unit and the low-pass filtering module. The other end of resistor R4 is respectively connected to one end of resistor R7 and the light emitting component of the optocoupler. The other end of resistor R7 is grounded.

[0010] According to some embodiments of the present utility model, the dimming abnormal noise filtering power supply circuit further includes a voltage stabilizing unit. The sampling feedback unit further includes resistor R3. The other end of resistor R4 is respectively connected to one end of resistor R3 and the voltage stabilizing unit. The other end of resistor R3 is respectively connected to one end of resistor R7 and the light emitting component of the optocoupler.

[0011] According to some embodiments of the present utility model, the voltage stabilizing unit includes voltage stabilizing diode ZD1. The cathode of voltage stabilizing diode ZD1 is respectively connected to the other end of resistor R4 and one end of resistor R3.

[0012] According to some embodiments of the present utility model, the low-pass filtering module includes capacitor C4, resistor R8, resistor R9 and resistor R11. One end of resistor R9 is respectively connected to one end of resistor R4 and the output end of the power adjustment unit. The other end of resistor R9 is respectively connected to one end of capacitor C4 and one end of resistor R8. The other end of resistor R8 is connected to one end of resistor R11. The other end of resistor R11 and the other end of capacitor C4 are grounded.

[0013] According to some embodiments of the present utility model, the sampling feedback unit further includes a capacitor C2, a resistor R6, a resistor R10, and a precision voltage regulator. The negative pole of the precision voltage regulator is respectively connected to one end of the capacitor C2 and the other end of the resistor R7. The other end of the capacitor C2 is connected to one end of the resistor R6. The other end of the resistor R6 is respectively connected to the other end of the resistor R8, one end of the resistor R11, one end of the resistor R10, and the controlled end of the precision voltage regulator. The other end of the resistor R10 is grounded.

[0014] According to some embodiments of the present utility model, the power regulation unit further includes a semiconductor switching tube and a rectification unit. The transformer assembly includes a first winding and a second winding that are mutually coupled. The switching tube is connected to the first winding to form at least part of a drive branch. The output end of the rectification and filtering module is connected to the drive branch. The second winding is connected to the input end of the rectification unit. The output end of the rectification unit is used to be connected to a dimming load. The control unit is connected to the controlled end of the switching tube.

[0015] The power supply device according to the second aspect embodiment of the present utility model includes the dimming abnormal sound filtering power supply circuit disclosed in any of the above embodiments.

[0016] The power supply device according to the embodiments of the present utility model has at least the following beneficial effects:

[0017] The power supply device of the present utility model applies the dimming abnormal sound filtering power supply circuit disclosed in any of the above embodiments, reduces abnormal sound, and the power supply operation is stable and reliable.

[0018] The additional aspects and advantages of the present utility model will be partially given in the following description, partially will become obvious from the following description, or will be understood through the practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present utility model will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, wherein:

[0020] Figure 1 is the principle block diagram of one embodiment of the dimming abnormal sound filtering power supply circuit of the present utility model;

[0021] Figure 2 is the circuit schematic diagram of one embodiment of the dimming abnormal sound filtering power supply circuit of the present utility model.

[0022] Reference Signs:

[0023] Rectification and filtering module 100; power modulation module 200; power regulation unit 210; control unit 220; sampling and feedback unit 230; resistive voltage dividing component 231; optocoupler 232; precision voltage stabilizer 233; low-pass filtering module 300; voltage regulation unit 400; dimmable load 500. Detailed implementation manners

[0024] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation to the present utility model.

[0025] In the description of the present utility model, it should be understood that for the orientation description, such as the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model 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, and therefore should not be construed as a limitation to the present utility model.

[0026] In the description of the present utility model, the meaning of "several" is one or more, the meaning of "multiple" is two or more, and understandings such as "greater than", "less than", "exceeding", etc. do not include the present number, and understandings such as "above", "below", "within", etc. include the present number. If there is a description of "first" and "second", it is only for the purpose of distinguishing technical features and should not be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0027] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", "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 or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0028] Such as Figure 1 、 Figure 2As shown in the figure, a dimming abnormal noise filtering power supply circuit according to an embodiment of the first aspect of the present invention includes a rectifying and filtering module 100, a power modulation module 200, and a low-pass filtering module 300. The input end of the rectifying and filtering module 100 is used to connect to a power supply. The power modulation module 200 includes a power adjustment unit 210, a control unit 220, and a sampling and feedback unit 230. A voltage transformation component is provided in the power adjustment unit 210. The input end of the power adjustment unit 210 is connected to the output end of the rectifying and filtering module 100. The output end of the power adjustment unit 210 is used to connect to a dimming load 500. The sampling end of the sampling and feedback unit 230 is connected to the output end of the power adjustment unit 210 to detect a feedback signal representing the output voltage. The output end of the sampling and feedback unit 230 is connected to the control unit 220. The control unit 220 is connected to the controlled end of the power adjustment unit 210 to control the operation of the power adjustment unit 210 according to the feedback signal. The low-pass filtering module 300 is connected to the sampling and feedback unit 230 to filter out the ripple of the feedback signal.

[0029] Wherein, the rectifying and filtering module 100 includes a rectifying component and a filtering component. The rectifying component is a full-wave rectifier bridge or a half-wave rectifier bridge. The filtering component is a filtering capacitor. The rectifying and filtering module 100 rectifies and filters the alternating current output by the power supply, and then provides it to the power modulation module 200. The rectifying and filtering module 100 may further include a fuse. The input end of the rectifying component is connected to the power supply through the fuse.

[0030] In some embodiments of the present invention, the power modulation module 200 may be a conventional switching power supply module. The power adjustment unit 210 further includes a semiconductor switching tube and a rectifying unit (not shown in the figure). The voltage transformation component includes a first winding and a second winding that are mutually coupled. The switching tube is connected to the first winding to form at least part of a driving branch. The output end of the rectifying and filtering module 100 is connected to the driving branch. The second winding is connected to the input end of the rectifying unit. The output end of the rectifying unit is used to connect to the dimming load 500. The control unit 220 is connected to the controlled end of the switching tube.

[0031] The switching tube may be a triode or a MOS tube. The rectifying unit may be a full-wave rectifier bridge or a half-wave rectifier bridge composed of diodes.

[0032] The dimming abnormal sound filtering power supply circuit of the present utility model, the control unit 220 controls the power adjustment unit 210 to modulate the input voltage provided by the rectification and filtering module 100 to form an output voltage. The sampling feedback unit 230 samples the output voltage and forms a feedback signal to be provided to the control unit 220. The control unit 220 controls the power adjustment unit 210 according to the feedback signal, thereby controlling the magnitude of the output voltage. The output voltage is provided to the dimming load 500. The dimming load 500 may generate a ripple signal during the dimming process. The ripple signal is superimposed on the output voltage and invades the power supply adjustment module. The low-pass filtering module 300 can filter out the ripple of the feedback signal. This design reduces abnormal sound and the power supply operation is stable and reliable.

[0033] In some embodiments of the present utility model, the sampling feedback unit 230 includes a resistive voltage dividing component 231 and an optocoupler 232. The head end of the resistive voltage dividing component 231 is connected to the output end of the power adjustment unit 210. The tail end of the resistive voltage dividing component 231 is grounded. The voltage dividing end of the resistive voltage dividing component 231 is connected to the light emitting component of the optocoupler 232. The light receiving component of the optocoupler 232 is connected to the control unit 220. The low-pass filtering module 300 is connected to the resistive voltage dividing component 231.

[0034] The resistive voltage dividing component 231 divides the output voltage for sampling to form a feedback signal that can represent the magnitude of the output voltage. The optocoupler 232 isolates the interference signal. The optocoupler 232 forms a level signal according to the feedback signal to be provided to the control unit 220, and can prevent the interference signal from invading the control unit 220.

[0035] Specifically, the resistive voltage dividing component 231 includes a resistor R4 and a resistor R7. One end of the resistor R4 is respectively connected to the output end of the power adjustment unit 210 and the low-pass filtering module 300. The other end of the resistor R4 is respectively connected to one end of the resistor R7 and the light emitting component of the optocoupler 232. The other end of the resistor R7 is grounded.

[0036] In some embodiments of the present utility model, as Figure 2 shown, the dimming abnormal sound filtering power supply circuit further includes a voltage stabilizing unit 400. The sampling feedback unit 230 further includes a resistor R3. The other end of the resistor R4 is respectively connected to one end of the resistor R3 and the voltage stabilizing unit 400. The other end of the resistor R3 is respectively connected to one end of the resistor R7 and the light emitting component of the optocoupler 232.

[0037] The voltage stabilizing unit 400 can stabilize the output loop of the output voltage. Cooperating with the low-pass filtering module 300 can further filter out the ripple signal and improve the stability of the output voltage and the feedback signal.

[0038] Specifically, the voltage stabilizing unit 400 includes a voltage stabilizing diode ZD1, and the cathode of the voltage stabilizing diode ZD1 is respectively connected to the other end of the resistor R4 and one end of the resistor R3.

[0039] In some embodiments of the present invention, as Figure 2 shown, the low-pass filtering module 300 includes a capacitor C4, resistors R8, R9, and R11. One end of the resistor R9 is respectively connected to one end of the resistor R4 and the output end of the power regulation unit 210. The other end of the resistor R9 is respectively connected to one end of the capacitor C4 and one end of the resistor R8. The other end of the resistor R8 is connected to one end of the resistor R11, and the other end of the resistor R11 and the other end of the capacitor C4 are grounded.

[0040] In some embodiments of the present invention, as Figure 2 shown, the sampling feedback unit 230 further includes a capacitor C2, resistors R6, R10, and a precision voltage stabilizing source 233. The negative pole of the precision voltage stabilizing source 233 is respectively connected to one end of the capacitor C2 and the other end of the resistor R7. The other end of the capacitor C2 is connected to one end of the resistor R6. The other end of the resistor R6 is respectively connected to the other end of the resistor R8, one end of the resistor R11, one end of the resistor R10, and the controlled end of the precision voltage stabilizing source 233. The other end of the resistor R10 is grounded.

[0041] The power supply device according to the second aspect embodiment of the present invention includes the dimming abnormal sound filtering power supply circuit disclosed in any of the above embodiments.

[0042] The power supply device of the present invention applies the dimming abnormal sound filtering power supply circuit disclosed in any of the above embodiments, reduces abnormal sound, and the power supply operation is stable and reliable.

[0043] The technical features of the above embodiments can be combined arbitrarily. For the sake of brief description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0044] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and purposes of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A dimming abnormal noise filtering power supply circuit, characterized in that, Comprising: A rectifying and filtering module, the input end of which is used to connect to a power supply. A power modulation module, including a power adjustment unit, a control unit, and a sampling and feedback unit. A voltage transformation component is arranged in the power adjustment unit. The input end of the power adjustment unit is connected to the output end of the rectifying and filtering module. The output end of the power adjustment unit is used to connect to a dimming load. The sampling end of the sampling and feedback unit is connected to the output end of the power adjustment unit to detect a feedback signal representing the output voltage. The output end of the sampling and feedback unit is connected to the control unit, and the control unit is connected to the controlled end of the power adjustment unit to control the operation of the power adjustment unit according to the feedback signal. A low-pass filtering module, connected to the sampling and feedback unit to filter out the ripple of the feedback signal.

2. The dimming abnormal noise filtering power supply circuit according to claim 1, characterized in that: The sampling and feedback unit includes a resistive voltage dividing component and an optocoupler. The head end of the resistive voltage dividing component is connected to the output end of the power adjustment unit. The tail end of the resistive voltage dividing component is grounded. The voltage dividing end of the resistive voltage dividing component is connected to the light-emitting component of the optocoupler. The light-receiving component of the optocoupler is connected to the control unit. The low-pass filtering module is connected to the resistive voltage dividing component.

3. The dimming abnormal noise filtering power supply circuit according to claim 2, characterized in that: The resistive voltage dividing component includes resistor R4 and resistor R7. One end of resistor R4 is respectively connected to the output end of the power adjustment unit and the low-pass filtering module. The other end of resistor R4 is respectively connected to one end of resistor R7 and the light-emitting component of the optocoupler. The other end of resistor R7 is grounded.

4. A dimming abnormal noise filtering power supply circuit according to claim 3, characterized in that, It further includes a voltage stabilizing unit. The sampling and feedback unit further includes resistor R3. The other end of resistor R4 is respectively connected to one end of resistor R3 and the voltage stabilizing unit. The other end of resistor R3 is respectively connected to one end of resistor R7 and the light-emitting component of the optocoupler.

5. A dimming abnormal noise filtering power supply circuit according to claim 4, wherein, The voltage stabilizing unit includes zener diode ZD1. The cathode of zener diode ZD1 is respectively connected to the other end of resistor R4 and one end of resistor R3.

6. The dimming abnormal noise filtering power supply circuit according to claim 3, characterized in that The low-pass filtering module includes capacitor C4, resistor R8, resistor R9, and resistor R11. One end of resistor R9 is respectively connected to one end of resistor R4 and the output end of the power adjustment unit. The other end of resistor R9 is respectively connected to one end of capacitor C4 and one end of resistor R8. The other end of resistor R8 is connected to one end of resistor R11. The other end of resistor R11 and the other end of capacitor C4 are grounded.

7. A dimming abnormal noise filtering power supply circuit according to claim 6, characterized in that, The sampling and feedback unit further includes capacitor C2, resistor R6, resistor R10, and a precision voltage stabilizing source. The negative pole of the precision voltage stabilizing source is respectively connected to one end of capacitor C2 and the other end of resistor R7. The other end of capacitor C2 is connected to one end of resistor R6. The other end of resistor R6 is respectively connected to the other end of resistor R8, one end of resistor R11, one end of resistor R10, and the controlled end of the precision voltage stabilizing source. The other end of resistor R10 is grounded.

8. A dimming abnormal noise filtering power supply circuit according to claim 1, characterized in that, The power adjustment unit further includes a semiconductor switching tube and a rectification unit. The voltage transformation component includes a first winding and a second winding that are mutually coupled. The switching tube is connected to the first winding to form at least part of a driving branch. The output end of the rectification and filtering module is connected to the driving branch. The second winding is connected to the input end of the rectification unit. The output end of the rectification unit is used to be connected to a dimming load. The control unit is connected to the controlled end of the switching tube.

9. A power supply device, characterized in that, It includes the dimming abnormal sound filtering power supply circuit according to any one of claims 1-8.

Images