Digital dimming power supply control circuit

Abstract

The utility model relates to the technical field of dimming power supplies, and discloses a digital dimming power supply control circuit capable of realizing multi-voltage / multi-current switching, which comprises an AC (Alternating Current)-DC (Direct Current) circuit (200) for converting an AC signal into a DC signal, a DC-DC circuit (300), a dimming circuit (400), a dimming signal detection circuit (720) and an MCU (Microprogrammed Control Unit) circuit (800), the MCU circuit (800) regulates and outputs at least one path of PWM pulse signal according to the dimming signal; the MCU circuit (800) is used for controlling the on / off state of the DC-to-DC circuit (300); the dimming circuit (400) is used for receiving the DC signal after voltage boosting or voltage reduction processing, the dimming circuit (400) is used for receiving a PWM pulse signal, the output end of the dimming circuit (400) is connected with a load, and the power of the load is controlled according to the input PWM pulse signal.

Description

Technical Field

[0001] The utility model relates to the technical field of dimming power supply, and more specifically to a digital dimming power supply control circuit. Background Art

[0002] Common ways of LED dimming are pulse width modulation dimming (PWM Dimming) and analog dimming (Analog Dimming). Among them, analog dimming adjusts the brightness of the lamp by changing the amplitude of the LED lamp current. Obviously, the larger the current, the brighter the LED; the smaller the current, the dimmer the LED.

[0003] At present, when analog control is adopted, the power output is adjusted by changing the amplitude of the power supply output voltage or current, and the voltage is reduced by adjusting the resistance. Since it is designed as a fixed function, users cannot freely switch between constant voltage output and constant current output on the same product. The constant voltage output and constant current output are not integrated, and the output voltage or current cannot be freely selected, for example: the constant voltage output is fixed at 12V, or fixed at 24V, or fixed at 36V, or fixed at 48V. Summary of the invention

[0004] The technical problem to be solved by the utility model is that, in view of the defect in the prior art that the user cannot freely switch between constant voltage output and constant current output on the same product mentioned above, a digital dimming power supply control circuit capable of realizing multi-voltage / multi-current switching is provided.

[0005] The technical solution adopted by the utility model to solve the technical problem is to construct a digital dimming power supply control circuit, which has:

[0006] An AC to DC circuit is arranged at the front end of the control circuit, and is used to receive an input AC signal and convert the AC signal into a DC signal;

[0007] A DC-to-DC circuit, one input end of which is coupled to the output end of the AC-to-DC circuit, for receiving the DC signal and performing a voltage step-up or voltage step-down process on the DC signal;

[0008] A dimming circuit, whose power input terminal is connected to the output terminal of the DC-to-DC circuit, and is used to receive the DC signal after voltage boost or voltage reduction processing;

[0009] A dimming signal detection circuit, whose input end is used to receive an input dimming signal;

[0010] An MCU circuit, whose first input terminal is connected to the output terminal of the dimming signal detection circuit, is used to receive the dimming signal, and regulate and output at least one PWM pulse signal according to the dimming signal;

[0011] The first output terminal of the MCU circuit is connected to the other input terminal of the DC-to-DC circuit, and the MCU circuit is used to output a control level, and the control level is used to control the on / off state of the DC-to-DC circuit;

[0012] An input terminal of the dimming circuit is coupled to the second output terminal of the MCU circuit for receiving the PWM pulse signal.

[0013] The output end of the dimming circuit is connected to a load, and the power of the load is controlled according to the input PWM pulse signal.

[0014] In some embodiments, a phase-cut signal detection circuit is further included.

[0015] The detection end of the phase-cut signal detection circuit is connected to one end of the AC-DC converter circuit, and is used to receive the phase-cut signal flowing through the AC-DC converter circuit.

[0016] The output end of the phase-cut signal detection circuit is connected to the second input end of the MCU circuit, and is used to receive the phase-cut signal and determine the duration of the low state and the high state of the phase-cut signal.

[0017] In some embodiments, a carrier signal detection circuit is further included.

[0018] The detection end of the carrier signal detection circuit is connected to one end of the AC to DC circuit, and is used to receive the carrier signal flowing through the AC to DC circuit.

[0019] The output end of the carrier signal detection circuit is connected to the third input end of the MCU circuit, and is used to receive the carrier signal and determine the frequency of the carrier signal.

[0020] In some embodiments, an external dimmer is also included.

[0021] The external dimmer is used to receive a dimming signal input from the outside.

[0022] The output end of the external dimmer is connected to the input end of the dimming signal detection circuit for receiving the dimming signal.

[0023] In some embodiments, the external dimmer includes a DALI dimmer, a DMX dimmer, a PWM dimmer, a 0-10 volt dimmer, a 1-10 volt dimmer, a wireless radio frequency dimmer, or a PUSH dimmer.

[0024] In some embodiments, a voltage detection circuit is further included.

[0025] The input end of the voltage detection circuit is connected to an output end of the DC-to-DC circuit to obtain a voltage signal output by the DC-to-DC circuit.

[0026] The output end of the voltage detection circuit is coupled to a feedback end of the MCU circuit for receiving the voltage signal.

[0027] In some embodiments, a current detection circuit is further included.

[0028] The input end of the current detection circuit is connected to the other output end of the DC-to-DC circuit, and is used to obtain the current signal output by the DC-to-DC circuit.

[0029] The output end of the current detection circuit is coupled to another feedback end of the MCU circuit for receiving the current signal.

[0030] In some embodiments, an NFC module is also included.

[0031] The NFC module is used to detect peripheral radio frequency signals.

[0032] The output end of the NFC module is connected to the input end of the MCU circuit for receiving the radio frequency signal.

[0033] In some embodiments, a multi-position switch is also included.

[0034] The multi-position switch is used to obtain a switch signal.

[0035] The output end of the multi-position switch is connected to the input end of the MCU circuit for receiving the switch signal.

[0036] In the digital dimming power supply control circuit described in the utility model, it includes an AC to DC circuit that converts the AC signal into a DC signal, a DC to DC circuit, a dimming circuit, a dimming signal detection circuit and an MCU circuit, wherein the MCU circuit controls and outputs at least one PWM pulse signal according to the dimming signal; the MCU circuit is used to control the on / off state of the DC to DC circuit; the dimming circuit is used to receive the DC signal after boost or buck processing, the dimming circuit is used to receive the PWM pulse signal, the output end of the dimming circuit is connected to the load, and the power of the load is controlled according to the input PWM pulse signal. Compared with the prior art, by processing the digital signal by the MCU circuit to adjust the power output, a more accurate and complex control strategy can be achieved, and the constant voltage output and the constant current output are integrated to achieve multi-voltage switchable and multi-current switchable; when switching different constant voltage outputs, the output power is full power output, and the power is maximized. When the user switches different output voltages, the same power load can also be used to improve the utilization rate of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0038] Figure 1 It is a framework diagram of an embodiment of a digital dimming power supply control circuit provided by the utility model. DETAILED DESCRIPTION

[0039] In order to have a clearer understanding of the technical features, purposes and effects of the present utility model, the specific implementation methods of the present utility model are now described in detail with reference to the accompanying drawings.

[0040] like Figure 1 As shown, in the first embodiment of the digital dimming power supply control circuit of the utility model, the digital dimming power supply control circuit 10 includes an EMC circuit 100, an AC to DC circuit 200, a DC to DC circuit 300, a dimming circuit 400, a phase-cutting signal detection circuit 500, a carrier signal detection circuit 600, an external dimmer 710, a dimming signal detection circuit 720, an MCU circuit 800, a voltage detection circuit 810 and a voltage detection circuit 820;

[0041] The EMC circuit 100 is used to receive a voltage signal input from the mains and eliminate common-mode interference in the voltage signal to improve the quality of the power supply;

[0042] The AC to DC circuit 200 is used to convert an AC signal into a DC signal, which can be directly or indirectly operably coupled to the output of the rectifier module, and the DC filter can be configured to filter interference, noise and / or a signal of a given frequency from the rectified DC power received by the previous digital rectifier module;

[0043] The rectifier modules may also include isolation elements, such as conditioning diodes and DC blocking diodes wherein each module may be configured to provide a digital rectifier module with a given desired degree of waveform conditioning;

[0044] The DC-DC converter 300 is used to convert an input high-voltage DC signal into a low-voltage DC signal, or convert a low-voltage DC signal into a high-voltage DC signal. The DC-DC converter 300 is directly or indirectly operably coupled to the output of the front-stage DC filter. The DC-DC converter can be configured to receive the rectified DC current from the front-stage DC filter; and one or more high-frequency PWM pulse signals from the front-stage MCU circuit 800. The DC-DC converter can be configured to convert the rectified DC power from a first voltage and / or current level to a second voltage and / or current level based on the PWM pulse signal, and output the DC power to the dimming circuit 400;

[0045] The output DC power may be based at least in part on the duty cycle of the PWM pulse signal received from the PWM module. The MCU may be a linear or switching converter, a buck converter, or a boost converter for this purpose.

[0046] For example: converting a 48V input to a constant voltage output of 12V, or

[0047] Fixed output 24V, or

[0048] Fixed output 36V;

[0049] Or convert the input of 12V-36V to a constant voltage output of 48V or more, and realize several switching outputs;

[0050] The dimming circuit 400 is used to receive the PWM pulse signal and adjust the power of the load through the PWM pulse signal, which can improve the load current / voltage to an intensity that allows deeper low-intensity dimming;

[0051] The phase-cut signal detection circuit 500 may be configured to suppress surges and isolate internal and external noise from the waveform of the phase-cut AC signal, and based thereon generate a rectified DC power and a rectified phase-cut signal, and feed the phase-cut signal back to the MCU circuit 800;

[0052] The phase-cut signal detection circuit 500 may be configured with a zero-crossing detection and timer module.

[0053] Zero-crossing detection detects when the voltage of a waveform rises or falls to zero.

[0054] The timer module may be configured to sample the rectified phase-cut signal at a sampling frequency specified by the MCU circuit 800;

[0055] The carrier signal detection circuit 600 can load the current signal flowing through the AC-to-DC circuit 200 onto a high-frequency signal of a certain frequency. When the high-frequency signal of the ordinary signal is not loaded, the amplitude of the high-frequency signal is fixed. After loading, the amplitude changes with the change of the ordinary signal (amplitude modulation), and phase modulation or frequency modulation can also be performed.

[0056] The external dimmer 710 is used to input a dimming signal;

[0057] The dimming signal detection circuit 720 is used to receive the dimming signal and then feed the dimming signal back to the MCU circuit 800;

[0058] The MCU circuit 800 is the core of the control circuit, and it outputs at least one PWM pulse signal and one control level signal according to the input dimming signal.

[0059] The PWM pulse signal can act on the dimming circuit 400 to control its on / off state and conduction angle.

[0060] The control level signal may act on the DC-to-DC circuit 300 to control its conduction and convert the input high voltage DC signal into a low voltage DC signal;

[0061] The voltage detection circuit 810 is used to obtain the voltage signal output by the DC-to-DC circuit 300 and feed the voltage signal back to the MCU circuit 800, which then adjusts the duty cycle of the PWM pulse signal according to the fed-back voltage signal;

[0062] The voltage detection circuit 820 is used to obtain the current signal output by the DC-to-DC circuit 300 and feed the current signal back to the MCU circuit 800, which then adjusts the duty cycle of the PWM pulse signal according to the fed-back current signal;

[0063] Specifically, the AC to DC circuit 200 is configured at the front end of the control circuit, and is used to receive the AC signal input through the EMC circuit 100, and convert the AC signal into a DC signal, and then output it to the subsequent circuit (such as the DC to DC circuit 300, the phase signal detection circuit 500 and the carrier signal detection circuit 600);

[0064] Furthermore, an input terminal of the DC-to-DC circuit 300 is coupled to the output terminal of the AC-to-DC circuit 200 for receiving a DC signal and performing a voltage-boosting or voltage-reducing process on the DC signal to output a voltage or current signal suitable for use by a load;

[0065] The power input terminal of the dimming circuit 400 is connected to the output terminal of the DC-to-DC circuit 300, and is used to receive the DC signal after the boost or buck process.

[0066] Further, the input end of the dimming signal detection circuit 720 is used to receive the input dimming signal;

[0067] The first input terminal of the MCU circuit 800 is connected to the output terminal of the dimming signal detection circuit 720, and is used to receive the dimming signal, and to adjust and output at least one PWM pulse signal according to the dimming signal;

[0068] The first output terminal of the MCU circuit 800 is connected to the other input terminal of the DC-to-DC circuit 300. The MCU circuit 800 is used to output a control level.

[0069] When the control level is high, the DC-to-DC circuit 300 is controlled to be turned on.

[0070] When the control level is low, the DC-to-DC circuit 300 is controlled to be turned off;

[0071] Further, an input terminal of the dimming circuit 400 is coupled to the second output terminal of the MCU circuit 800 for receiving the PWM pulse signal. The MCU circuit 800 can control the working state of the dimming circuit 400 by adjusting the duty cycle of the PWM pulse signal, for example, 100%→70%, 100%→50% or 100%→10%; or

[0072] 10%→60%, 30%→80% or 500%→100%;

[0073] The output end of the dimming circuit 400 is connected to the load, and controls the power of the load according to the input PWM pulse signal.

[0074] For example, the PWM pulse signal may be directly or directly operatively coupled to a communication module, the PWM pulse signal may receive a control signal or other signal from a remote source via the communication module, and adjust its PWM pulse signal output in response to the signal;

[0075] The PWM pulse signal may generate a PWM control signal based solely on an input from a remote source, the PWM pulse signal representing an intensity less than the maximum intensity of the rectified DC power, and if the PWM pulse signal is a control signal received from a communication module, the waveform has sufficient power to achieve 60% of the maximum intensity, then the PWM pulse signal (e.g., it represents a desired dimming intensity, e.g., a dimming intensity of 60% of the maximum intensity of the rectified DC power) may output a PWM pulse signal representing an intensity of approximately 60% of the maximum intensity of the rectified DC power;

[0076] It should be noted that the MCU circuit 800 at least includes a microcontroller unit (MCU) directly or indirectly operably coupled to the output of the digital rectifier module, and the MCU may include a processor core, a memory, and one or more programmable input / output ports;

[0077] In some cases, the MCU may also include additional components, such as an analog-to-digital converter (ADC) component and one or more interrupt controls;

[0078] Wherein, the MCU can be configured to act as a current bleeder to improve the load current to an intensity that allows deeper low-intensity dimming, especially when the rectified DC power received from the upstream digital rectifier module has a relatively low intensity;

[0079] The MCU may be configured to utilize cascade dimming when dimming the rectified DC power, thereby providing improved dimming results for the transmitter(s), particularly when the output intensity 10 of the rectified DC power received from the upstream digital rectification module is relatively low.

[0080] By using the present technical solution, the power output is adjusted by processing the digital signal through the MCU circuit 800, so that a more accurate and complex control strategy can be implemented, and the constant voltage output and the constant current output are integrated to achieve multi-voltage switchability and multi-current switchability; when switching different constant voltage outputs, the output power is output at full power to maximize power utilization. When users switch different output voltages, they can also use the same power load, thereby improving product utilization.

[0081] In some embodiments, a phase-cut signal detection circuit 500 is further included, wherein a detection end of the phase-cut signal detection circuit 500 is connected to one end of the AC-DC converter 200 to receive a phase-cut signal flowing through the AC-DC converter 200.

[0082] The output terminal of the phase-cut signal detection circuit 500 is connected to the second input terminal of the MCU circuit 800 for receiving the phase-cut signal and determining the duration of the low state and the high state of the phase-cut signal.

[0083] For example, a PWM pulse signal is generated based on each of the low value and the high value of the phase cutting signal. This generation can be provided by a PWM module inside the MCU circuit 800. As described above, DC power is generated based on the rectified DC power and the PWM pulse signal, and the DC power is supplied to the solid-state transmitter.

[0084] The low value is compared with the half cycle of the rectified phase-cut signal, and the high value is compared with the half cycle of the rectified phase-cut signal. If the low value exceeds the acceptable low value, the low value is reset with the accepted low value, and if the high value exceeds the acceptable high value, the high value is reset with the accepted high value.

[0085] In some embodiments, a carrier signal detection circuit 600 is further included, wherein the power carrier is a communication method unique to the power system, and the power carrier communication refers to the use of existing power lines to transmit analog or digital signals at high speed through carriers;

[0086] Specifically, the detection end of the carrier signal detection circuit 600 is connected to one end of the AC to DC circuit 200 to receive the carrier signal flowing through the AC to DC circuit 200.

[0087] The output end of the carrier signal detection circuit 600 is connected to the third input end of the MCU circuit 800 for receiving the carrier signal and determining the frequency of the carrier signal, and then adjusting the level state of the control signal or the duty cycle of the PWM signal according to the frequency.

[0088] In some embodiments, an external dimmer 710 is further included, which is configured to receive a dimming signal input from an external source.

[0089] The output end of the external dimmer 710 is connected to the input end of the dimming signal detection circuit 720 for receiving the dimming signal.

[0090] The external dimmer 710 includes a DALI dimmer, a DMX dimmer, a PWM dimmer, a 0-10 volt dimmer, a 1-10 volt dimmer, a wireless radio frequency dimmer, or a PUSH dimmer.

[0091] Among them, the wireless radio frequency can be 303Mhz, 315Mhz, 433Mhz, Zigbee, Bluetooth, Wifi, and Z-Wave.

[0092] In some embodiments, a voltage detection circuit 810 is further included, which is used to obtain a voltage signal when the load is working.

[0093] Specifically, an input terminal of the voltage detection circuit 810 is connected to an output terminal of the DC-to-DC circuit 300 to obtain a voltage signal output by the DC-to-DC circuit 300.

[0094] The output terminal of the voltage detection circuit 810 is coupled to a feedback terminal of the MCU circuit 800 for receiving a voltage signal. The MCU circuit 800 adjusts the level state of the control signal or the duty cycle of the PWM signal according to the feedback voltage signal.

[0095] In some embodiments, a voltage detection circuit 820 is further included, which is used to obtain a current signal when the load is working.

[0096] Specifically, the input end of the voltage detection circuit 820 is connected to the other output end of the DC-to-DC circuit 300 to obtain the current signal output by the DC-to-DC circuit 300.

[0097] The output terminal of the voltage detection circuit 820 is coupled to another feedback terminal of the MCU circuit 800 for receiving a current signal. The MCU circuit 800 adjusts the level state of the control signal or the duty cycle of the PWM signal according to the feedback current signal.

[0098] In some embodiments, an NFC module 900 is also included, which is used to detect peripheral radio frequency signals and enable data exchange when the two devices are close to each other.

[0099] The output end of the NFC module 900 is connected to the input end of the MCU circuit 800 for receiving a radio frequency signal, and the MCU circuit 800 implements data interaction according to the fed-back radio frequency signal.

[0100] In some embodiments, a multi-position switch 900 is further included, which is used to obtain a switch signal.

[0101] The output end of the multi-speed switch 900 is connected to the input end of the MCU circuit 800 for receiving a switch signal. The MCU circuit 800 adjusts the working state of the load according to the input switch signal.

[0102] This technical solution has the following effects:

[0103] 1. Adopt digital control technology, and adjust the power output by processing digital signals through MCU, which can realize more precise and complex control strategies;

[0104] 2. Constant voltage output and constant current output are integrated to achieve multi-voltage and multi-current switching; the application is more extensive, and the same product can be adapted to more lamps;

[0105] 3. When switching different constant voltage outputs, the output power can reach full power output to maximize power utilization. When users switch different output voltages, they can also use the same power load to improve product utilization.

[0106] The embodiments of the utility model are described above in conjunction with the accompanying drawings, but the utility model is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the enlightenment of the utility model, ordinary technicians in this field can also make many forms without departing from the scope of protection of the utility model and the claims, which all fall within the protection of the utility model.

Claims

1. A digital dimming power supply control circuit, characterized in that: have: An AC to DC circuit is arranged at the front end of the control circuit, and is used to receive an input AC signal and convert the AC signal into a DC signal; A DC-to-DC circuit, one input end of which is coupled to the output end of the AC-to-DC circuit, for receiving the DC signal and performing a voltage step-up or voltage step-down process on the DC signal; A dimming circuit, whose power input terminal is connected to the output terminal of the DC-to-DC circuit, and is used to receive the DC signal after voltage boost or voltage reduction processing; A dimming signal detection circuit, whose input end is used to receive an input dimming signal; An MCU circuit, whose first input terminal is connected to the output terminal of the dimming signal detection circuit, is used to receive the dimming signal, and regulate and output at least one PWM pulse signal according to the dimming signal; The first output terminal of the MCU circuit is connected to the other input terminal of the DC-to-DC circuit, and the MCU circuit is used to output a control level, and the control level is used to control the on / off state of the DC-to-DC circuit; An input terminal of the dimming circuit is coupled to the second output terminal of the MCU circuit for receiving the PWM pulse signal. The output end of the dimming circuit is connected to a load, and the power of the load is controlled according to the input PWM pulse signal.

2. The digital dimming power supply control circuit according to claim 1, characterized in that: It also includes a phase-cut signal detection circuit, The detection end of the phase-cut signal detection circuit is connected to one end of the AC-DC converter circuit, and is used to receive the phase-cut signal flowing through the AC-DC converter circuit. The output end of the phase-cut signal detection circuit is connected to the second input end of the MCU circuit, and is used to receive the phase-cut signal and determine the duration of the low state and the high state of the phase-cut signal.

3. The digital dimming power supply control circuit according to claim 1, characterized in that: Also includes a carrier signal detection circuit, The detection end of the carrier signal detection circuit is connected to one end of the AC to DC circuit, and is used to receive the carrier signal flowing through the AC to DC circuit. The output end of the carrier signal detection circuit is connected to the third input end of the MCU circuit, and is used to receive the carrier signal and determine the frequency of the carrier signal.

4. The digital dimming power supply control circuit according to any one of claims 1 to 3, characterized in that: Also includes external dimmer, The external dimmer is used to receive a dimming signal input from the outside. The output end of the external dimmer is connected to the input end of the dimming signal detection circuit for receiving the dimming signal.

5. The digital dimming power supply control circuit according to claim 4, characterized in that: The external dimmer includes a DALI dimmer, a DMX dimmer, a PWM dimmer, a 0-10 volt dimmer, a 1-10 volt dimmer, a wireless radio frequency dimmer, or a PUSH dimmer.

6. The digital dimming power supply control circuit according to any one of claims 1 to 3, characterized in that: Also includes voltage detection circuit, The input end of the voltage detection circuit is connected to an output end of the DC-to-DC circuit to obtain a voltage signal output by the DC-to-DC circuit. The output end of the voltage detection circuit is coupled to a feedback end of the MCU circuit for receiving the voltage signal.

7. The digital dimming power supply control circuit according to any one of claims 1 to 3, characterized in that: Also includes current detection circuit, The input end of the current detection circuit is connected to the other output end of the DC-to-DC circuit, and is used to obtain the current signal output by the DC-to-DC circuit. The output end of the current detection circuit is coupled to another feedback end of the MCU circuit for receiving the current signal.

8. The digital dimming power supply control circuit according to any one of claims 1 to 3, characterized in that: Also includes NFC module, The NFC module is used to detect peripheral radio frequency signals. The output end of the NFC module is connected to the input end of the MCU circuit for receiving the radio frequency signal.

9. The digital dimming power supply control circuit according to any one of claims 1 to 3, characterized in that: Also includes a multi-position switch, The multi-position switch is used to obtain a switch signal. The output end of the multi-position switch is connected to the input end of the MCU circuit for receiving the switch signal.

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