CN209824074U - Non-isolated dimming constant current power supply and control system - Google Patents
Non-isolated dimming constant current power supply and control system Download PDFInfo
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Abstract
The utility model provides a non-isolation dimming constant current power supply and control system, non-isolation dimming constant current power supply include power control IC, little the control unit MCU and transformer. The micro control unit MCU receives a dimming control signal from a user, analyzes dimming power corresponding to the dimming control signal, generates a linear dimming mode control signal if the dimming power is greater than preset power, and generates an intermittent mode control signal if the dimming power is less than the preset power; when the power supply control IC works in a linear light modulation mode, the received PWM signal is converted into a linear voltage signal, the output current Io of the load LED is adjusted by using the linear voltage signal, when the power supply control IC works in an intermittent mode, a frequency signal in a preset range is generated according to the received PWM signal and is supplied to the transformer, and the output current Io of the load LED is adjusted by using the received PWM signal. By combining the linear dimming mode and the intermittent dimming mode, the noise which can be perceived by human ears produced by the transformer in the constant-current power supply is effectively eliminated.
Description
Technical Field
The utility model relates to the field of lighting technology, especially, relate to a non-isolation constant current power supply and control system of adjusting luminance.
Background
With the continuous development of lighting technology, people have higher and higher requirements on lighting. Currently, in order to increase the dimming depth, PWM (Pulse Width Modulation) dimming is generally adopted, and when the PWM is high, the power circuit of the circuit operates, and when the PWM is low, the power circuit of the circuit stops operating. Because the PWM dimming frequency is within the range that human ears can perceive, the vibration sound production of the transformer is also within the range that human ears perceive, and the noise is usually eliminated by adopting the transformer impregnation and dispensing methods, which can only reduce the noise, but cannot eliminate the noise fundamentally, and human ears can still hear the sound produced by the power supply. In addition, open circuit protection is adopted for the circuit, the traditional power supply can realize open circuit protection restart, and repeated restart can cause ignition and combustion of the load light source plate.
SUMMERY OF THE UTILITY MODEL
In view of the above, the present invention has been made to provide a non-isolated dimming constant current power supply and control system that overcomes or at least partially solves the above problems.
According to one aspect of the present invention, there is provided a non-isolated dimming constant current power supply, comprising a power control IC, a micro control unit MCU and a transformer, which are respectively connected to the power control IC, wherein,
the micro control unit MCU is configured to receive a dimming control signal from a user, generate a corresponding PWM signal and a working mode control signal according to the dimming control signal, and send the PWM signal and the working mode control signal to the power supply control IC;
when the dimming power corresponding to the dimming control signal is greater than the preset power, the Micro Control Unit (MCU) generates a linear dimming mode control signal; when the dimming power corresponding to the dimming control signal is smaller than the preset power, generating an intermittent mode control signal;
if the power supply control IC receives a linear dimming mode control signal, the power supply control IC works in a linear dimming mode, converts the received PWM signal into a linear voltage signal, and adjusts the output current Io of the load LED by using the linear voltage signal; and if the intermittent mode control signal is received, working in an intermittent mode, generating a frequency signal in a preset range according to the received PWM signal, providing the frequency signal to the transformer, and adjusting the output current Io of the load LED by using the received PWM signal.
Optionally, the MCU has a first communication port, a PWM port, and a receiving port, and is configured to receive a dimming control signal from a user through the receiving port, generate a corresponding PWM signal and a working mode control signal according to the dimming control signal, send the PWM signal to the power control IC through the PWM port, and send the working mode control signal to the power control IC through the first communication port;
the power supply control IC is provided with a PWM pin connected with the PWM port and a communication pin in communication connection with the first communication port, the PWM pin is used for receiving the PWM signal, and the communication pin is used for receiving the working mode control signal.
Optionally, the device further comprises a driving resistor R1 and a switching element, wherein,
the power supply control IC comprises a driving pin GD, the driving pin GD is connected with one end of the driving resistor R1, and the other end of the driving resistor R1 is connected with the switch element; the switching element is connected with one end of the primary side of the transformer, and the other end of the primary side of the transformer is connected with the negative electrode of the load LED;
the power supply control IC operates in an intermittent mode, and transmits a generated frequency signal in a preset range to the switching element through the driving resistor R1, and the switching element supplies the frequency signal to the transformer.
Optionally, the switching element comprises a power field effect transistor MOS;
the grid electrode of the power field effect transistor MOS is connected with the driving resistor R1, the source electrode is grounded, and the drain electrode is connected with one end of the primary side of the transformer.
Optionally, the LED lighting circuit further comprises a voltage dividing resistor R2 and a voltage dividing resistor R3, one end of the voltage dividing resistor R3 is connected to a negative electrode of the load LED, the other end of the voltage dividing resistor R2 is connected to the ground, and the other end of the voltage dividing resistor R2 is connected to the ground;
the power control IC comprises a first detection pin, wherein the first detection pin is connected to a connection point of a voltage division resistor R2 and a voltage division resistor R3 and is configured to be used for detecting the divided voltage of the voltage division resistor R2 and then comparing the divided voltage with a preset reference voltage Vref, if the divided voltage of the voltage division resistor R2 obtained through comparison is larger than the preset reference voltage Vref, the switching element is controlled to be in a cut-off state, and the current cut-off state is kept within a preset time.
Optionally, an RC integration circuit is integrated in the power control IC, the power control IC operates in a linear dimming mode, converts the received PWM signal into a linear voltage signal through the RC integration circuit, and if the duty ratio of the PWM signal is increased, the value of the converted linear voltage signal is increased, the preset reference voltage Vref is increased, and the output current Io of the load LED is increased.
Optionally, the switch further comprises a resistor R4, one end of the resistor R4 is connected to the switching element, and the other end is grounded;
the first detection pin of the power supply control IC detects the output voltage of the load LED by detecting the voltage division of the voltage division resistor R2;
the power supply control IC comprises a CS pin which is connected with the ungrounded end of the resistor R4, and the power supply control IC works in a linear dimming mode to detect the average current of the load LED by detecting the peak current on the resistor R4 by using the CS pin;
the power supply control IC determines the output power of the load LED using the output voltage and the average current of the load LED.
Optionally, the switch further comprises a resistor R4, one end of the resistor R4 is connected to the switching element, and the other end is grounded;
the first detection pin of the power supply control IC detects the output voltage of the load LED by detecting the voltage division of the voltage division resistor R2;
the power supply control IC comprises a CS pin and is connected with the ungrounded end of the resistor R4, the power supply control IC works in an intermittent mode, the CS pin is used for detecting the peak voltage on the resistor R4, the peak voltage on the resistor R4 is amplified and is processed by the RC integrating circuit, and then the average current of the load LED is calculated;
the power supply control IC determines the output power of the load LED using the output voltage and the average current of the load LED.
Optionally, the device further comprises a resistor R4, a resistor R5 connected in series with the resistor R4;
the first detection pin of the power supply control IC detects the output voltage of the load LED by detecting the voltage division of the voltage division resistor R2;
the power supply control IC comprises a second detection pin, the second detection pin is connected to a connection point of the resistor R4 and the resistor R5, the voltage division of the resistor R5 is detected, and after the voltage division of the resistor R5 is amplified, the average current of the load LED is calculated;
the power supply control IC determines the output power of the load LED using the output voltage and the average current of the load LED.
Optionally, the method further comprises: the interface is respectively connected with the MCU and the external control end;
the micro control unit MCU receives the dimming control signal sent by a user through the external control end through the interface;
the power supply control IC sends the output power of the load LED to the MCU; and the micro control unit MCU is used for transmitting the received output power of the load LED to the external control end through the interface.
Optionally, the interface is connected to the power control IC, and the power control IC detects a fault state of each device connected thereto, and sends the detected fault state to the external control terminal through the interface.
Optionally, the interface and the external control terminal are both provided with a wireless communication module, and the MCU receives the dimming control signal from the external control terminal through the wireless communication module in the interface and transmits the output power of the load LED to the external control terminal.
Optionally, the external control terminal includes a mobile terminal.
According to another aspect of the present invention, there is provided a control system comprising an interface, an external control terminal, a load LED, the non-isolated dimming constant current power supply of any of the above embodiments, wherein,
the interface is respectively connected with the external control end and the non-isolated dimming constant current power supply;
the non-isolated dimming constant current power supply is provided with an input end and an output end, the input end is connected with a power supply, and the output end is connected with the load LED and is configured to provide constant current for the load LED;
the non-isolated dimming constant current power supply is further configured to receive the dimming control signal sent by a user through the external control terminal through the interface so as to adjust the output current Io of the load LED by using the dimming control signal; and determining the output power of the load LED by detecting the output voltage and the average current of the load LED, and sending the output power of the load LED to the external control end through the interface.
In the embodiment of the utility model, the micro control unit MCU in the non-isolated dimming constant current power supply adopts a linear dimming mode when the dimming power corresponding to the dimming control signal is greater than the preset power by receiving the dimming control signal provided by the user; and when the dimming power corresponding to the dimming control signal is smaller than the preset power, an intermittent dimming mode is adopted, and the working frequency of the transformer is controlled to be within the preset frequency range. The noise which can be sensed by human ears produced by the transformer in the constant current power supply is effectively eliminated by combining a linear dimming mode and an intermittent dimming mode. Moreover, the intermittent dimming mode can effectively increase the dimming depth of the power supply and improve the lighting experience of a user.
Further, since the operating frequency of the power supply cannot be increased without limit, the loss of the component will be increased due to an excessively high frequency, and the EMI (electromagnetic Interference) performance of the power supply will also be deteriorated. Therefore, by adjusting the operating frequency of the transformer to the preset frequency range, the good EMI performance and the good efficiency characteristic of the power circuit can also be maintained.
The above description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented according to the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more obvious and understandable, the following detailed description of the present invention is given.
The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 shows a schematic diagram of a partial structure of a non-isolated dimming constant current power supply according to an embodiment of the present invention;
fig. 2 shows a schematic diagram of a partial structure of a non-isolated dimming constant current power supply according to another embodiment of the present invention;
fig. 3 shows a schematic structural diagram of a control system according to an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
In order to solve the technical problem, an embodiment of the utility model provides a non-isolation constant current power supply that adjusts luminance. Fig. 1 shows a schematic structural diagram of a non-isolated dimming constant current power supply according to an embodiment of the present invention. Referring to fig. 1, the non-isolated dimming constant current power supply includes a micro control unit MCU, a micro control unit MCU connected to the power control IC, and a transformer T1. Wherein,
the micro control unit (mcu) is configured to receive a dimming control signal from a user, generate a corresponding PWM (pulse Width modulation) signal and a working mode control signal according to the dimming control signal, and send the PWM signal and the working mode control signal to the power control IC.
In this embodiment, the MCU generates a linear dimming mode control signal when the dimming power corresponding to the dimming control signal is greater than the preset power, and generates an intermittent mode control signal when the dimming power corresponding to the dimming control signal is less than the preset power.
And the power supply control IC works in the linear dimming mode when receiving the linear dimming mode control signal, converts the received PWM signal into a linear voltage signal, adjusts the output current Io of the load LED by using the linear voltage signal, works in the discontinuous mode when receiving the discontinuous mode control signal, generates a frequency signal in a preset range according to the received PWM signal, supplies the frequency signal to the transformer T1, and adjusts the output current Io of the load LED by using the received PWM signal.
The embodiment of the utility model provides an in, little the control signal that adjusts luminance that little the control unit MCU provided through the analysis user in the non-isolation constant current power supply that adjusts luminance, the mode that adopts linear dimming when the power of adjusting luminance that the control signal that adjusts luminance corresponds is greater than preset power adopts the mode of intermittent dimming when the power of adjusting luminance that the control signal that adjusts luminance corresponds is less than preset power to the operating frequency of control transformer is located preset frequency range. The noise which can be sensed by human ears produced by the transformer in the constant current power supply is effectively eliminated by combining a linear dimming mode and an intermittent dimming mode. Moreover, the intermittent dimming mode can effectively increase the dimming depth of the power supply and improve the lighting experience of a user. Further, since the operating frequency of the power supply cannot be increased without limit, the loss of the component will be increased due to an excessively high frequency, and the EMI (electromagnetic Interference) performance of the power supply will also be deteriorated. Therefore, by adjusting the operating frequency of the transformer to the preset frequency range, the good EMI performance and the good efficiency characteristic of the power circuit can also be maintained.
In an embodiment of the present invention, with continued reference to fig. 1, the MCU has a first communication port A, PWM, port B, and a receiving port C. The micro control unit MCU is configured to receive a dimming control signal from a user by using the receiving port C, generate a corresponding PWM signal and a working mode control signal according to the dimming control signal, transmit the PWM signal to the power supply control IC through the PWM port B, and transmit the working mode control signal to the power supply control IC through the first communication port A.
And the power supply control IC is provided with a PWM pin D connected with the PWM port B and a communication pin E in communication connection with the first communication port A, and receives a PWM signal by using the PWM pin D and receives an operating mode control signal by using the communication pin E.
The utility model relates to an embodiment, still integrated RC integrating circuit (not shown in the figure) in the power control IC, the power control IC work is under the linear mode of adjusting luminance, can convert received PWM signal into linear voltage signal through RC integrating circuit, when the little the control unit MCU according to user's the duty cycle increase of the PWM signal of adjusting luminance control signal control its production, it is corresponding, the linear voltage signal value that power control IC obtained according to the PWM signal conversion that increases also increases, thereby make and predetermine the increase of reference voltage Vref, and then, the increase of control load LED's output current Io. In this embodiment, preset reference voltage Vref is the voltage value that sets up in power control IC inside in advance, the embodiment of the utility model provides a do not restrict its concrete numerical value. The signal output by the RC integrating circuit in this embodiment may be proportional to the time integral of the signal input thereto.
The embodiment of the utility model provides a through the reference voltage Vref that changes decision output current to output current Io can be adjusted. In this embodiment, the non-isolated dimming constant current power supply further includes a resistor R4, one end of the resistor R4 is connected to the switching element Q1 (e.g., the source of the power field effect transistor MOS), and the other end is grounded. Since the power supply is operating in critical mode, the output current Io is Vref/2R 4.
In this embodiment, the inductance value L of the transformer T1 is calculated as L ═ Ui ═ D/(Ip ×) F, where Ui is the power input voltage, Uo is the power output voltage, D is the duty ratio of the power control IC driving power fet MOS, and F is the operating frequency of the transformer T1. Further, when the peak current Ip at the resistor R4 becomes Vref/R4, it is found that when Vref is small, the Ip value becomes small and the F frequency becomes high. However, the operating frequency of the power supply cannot be increased without limit, and the MOS loss is increased due to the too high frequency, the MOS generates heat greatly, and the EMI performance of the power supply is deteriorated. Therefore, it is necessary that when the frequency of the transformer T1 increases to a certain extent, the reference voltage cannot be changed any more, and that good EMI performance and good efficiency characteristics of the circuit are maintained.
The embodiment of the utility model provides an adopt intermittent type mode of adjusting luminance when being less than preset power through the power of adjusting luminance that the control signal that adjusts luminance corresponds (for low power), adjust load LED's output current to maintain transformer T1 work and predetermineeing frequency range, for example work is being greater than 20 KHz's frequency range, at this moment, transformer T1 can not send the noise that the human ear can the perception.
With reference to fig. 1, in an embodiment of the present invention, the non-isolated dimming constant current power supply further includes a driving resistor R1 and a switching element Q1 (such as a power field effect transistor MOS in fig. 1), wherein the power control IC includes a driving pin GD, one end of the driving resistor R1 is connected, and the other end of the driving resistor R1 is connected to the switching element Q1. The switching element Q1 is connected to one end of the primary side of the transformer T1, and the other end of the primary side of the transformer T1 is connected to the cathode of the load LED. When the power control IC operates in the discontinuous mode, the generated frequency signal of the preset range may be transmitted to the switching element Q1 through the driving resistor R1, the frequency applied to the switching element Q1 is the operating frequency of the transformer T1, and thus, the switching element Q1 may supply the frequency signal to the transformer T1.
In this embodiment, the switching element Q1 may be a power fet MOS, the gate of the power fet MOS is connected to the driving resistor R1, the drain of the power fet MOS is connected to one end of the primary side of the transformer T1 (i.e., the 10 end of the transformer T1), and the source of the power fet MOS is grounded via the resistor R4. The terminal 6 of the transformer T1 is connected with the cathode of the load LED, and the terminal 3 is grounded. In addition, in this embodiment, the load LED may be formed by combining a plurality of LEDs, such as a combination of LEDs connected in series or in parallel, and the embodiment of the present invention does not specifically limit this.
Traditional power can control output open circuit under some circumstances for protecting load LED, and the power constantly restarts, and repeated restart can cause the phenomenon that the light source board of load LED appears striking sparks to lead to load LED's light source board burning easily. In order to solve the problem, the utility model discloses constant current power supply adopts the dead mode of open circuit lock to avoid restarting the phenomenon of striking sparks. And when the power supply is turned on again, the power-off restart is required.
Continuing to refer to fig. 1, the utility model discloses non-isolation dimming constant current power supply of embodiment can also include divider resistance R2, divider resistance R3, and the load LED negative pole is connected to divider resistance R3 one end, and divider resistance R2, divider resistance R2 other end ground connection are connected to the other end.
The power control IC further comprises a first detection pin G, the first detection pin G is connected to a connection point of the voltage dividing resistor R2 and the voltage dividing resistor R3 and is configured to detect the divided voltage of the voltage dividing resistor R2 and then compare the divided voltage with a preset reference voltage Vref, if the divided voltage of the voltage dividing resistor R2 obtained through comparison is larger than the preset reference voltage Vref, the power control IC enters an open-circuit protection state, the switch element Q1 is controlled to be in a cut-off state, and the current cut-off state is kept within a preset time. When the loaded LED is open, VLED+＝VLED-。
In this embodiment, the preset time may be set to any time period, which may be set to be longer, so that the power supply control IC is always in the open-circuit protection state after entering the open-circuit protection state and before the next power-on restart, and the time is cleared after the power-off restart, so that the power supply circuit enters the normal operating state.
Therefore, the embodiment of the utility model provides a through the dead power of lock when the load is opened a way to cut off load LED to the return circuit of ground, for load LED has relieved bad striking sparks, avoided the phenomenon of burning on fire.
By adopting the traditional power supply circuit, a user cannot intuitively know the output power and the power consumption condition of the load LED. The embodiment of the utility model provides a can be through real-time supervision load LED's voltage and electric current in order to realize the output real-time supervision to load LED, improved user's use and experienced. Three ways of monitoring the output power of the load LED will be described separately below.
In a first mode
With continued reference to fig. 1, resistor R4 has one end connected to switching element Q1 (e.g., the source of power fet MOS) and the other end connected to ground. The first detection pin G of the power control IC detects the voltage divided by the voltage dividing resistor R2 to detect the output voltage of the load LED. Assuming that the voltage value obtained by voltage division of the voltage dividing resistor R2 is V1, the formula is usedThe voltage value V of Vled-can be calculatedled-, in turn, by the formula Vo＝Vin-Vled-And calculating to obtain the output voltage of the load LED. Wherein, VinIs the input voltage of a constant current source, VoIs the output voltage of the constant current power supply.
In this embodiment, the power control IC further has a CS pin connected to the ungrounded end of the resistor R4, and the power control IC operates in the linear dimming mode to detect the average current Io of the load LED through the CS pin by detecting the peak current Ip on the resistor R4. In this embodiment, the peak current on resistor R4Average current of loaded LED
Further, the power supply control IC may determine the output power P of the load LED using the output voltage and the average current of the load LED, wherein the output power P of the load LED is Vo Io.
Mode two
With continued reference to fig. 1, in this mode, resistor R4 has one end connected to switching element Q1 (e.g., the source of power fet MOS) and the other end connected to ground. The first detection pin G of the power control IC detects the voltage divided by the voltage dividing resistor R2 to detect the output voltage of the load LED. The way of calculating the output voltage of the load LED may be as described above.
In this embodiment, the power control IC also has a CS pin, and is connected to the ungrounded end of the resistor R4, and the power control IC operates in the discontinuous mode, detects the peak voltage of the resistor R4 by using the CS pin, amplifies the peak voltage of the resistor R4, and calculates the average current of the load LED by using the formula I-V/R after the peak voltage is processed by the RC integrating circuit.
Further, the power supply control IC may determine the output power P of the load LED using the output voltage and the average current of the load LED, wherein the output power P of the load LED is Vo Io.
Mode III
Referring to fig. 1 and 2, in this embodiment, a resistor R5 is further disposed in the non-isolated dimming constant current power supply, one end of the resistor R4 is connected to the switching element Q1 (e.g., the source of the power field effect transistor MOS), the other end is connected to the resistor R5, and the other end of the resistor R5 is grounded. The first detection pin G of the power control IC detects the voltage divided by the voltage dividing resistor R2 to detect the output voltage of the load LED. The way of calculating the output voltage of the load LED may be as described above.
In this embodiment, the power control IC is further provided with a second detection pin H, the second detection pin H is connected to a connection point of the resistor R4 and the resistor R5, and the average current of the load LED is calculated by detecting the voltage division of the resistor R5 and amplifying the detected voltage division of the resistor R5.
Further, the power supply control IC may determine the output power P of the load LED using the output voltage and the average current of the load LED, wherein the output power P of the load LED is Vo Io.
In an embodiment of the present invention, the non-isolated dimming constant current power supply is further provided with an interface, and the interface is connected to the MCU and the external control terminal (not shown in fig. 1).
And the micro control unit MCU receives the dimming control signal sent by the user through the external control end through the interface. And the power supply control IC sends the calculated output power of the load LED to the micro control unit MCU, and then the micro control unit MCU sends the received output power of the load LED to an external control end through an interface.
In this embodiment, the external control end may be a removable device, such as a mobile terminal, or a non-removable device, such as a computer. The external control end is provided with a corresponding client, and the received output power of the load LED can be displayed in a display interface of the client.
The utility model discloses in another embodiment, still be provided with on the power control IC and send pin I, send pin I can also with interface connection, the power control IC is through the fault state that detects each device rather than being connected to can send the fault state that detects to external control end through the interface. Of course, the external control end may use the corresponding client to show the fault state of the power supply.
As described above, the external control terminal can implement signal transmission with the power control IC and the MCU through the interface, and the signal transmission mode may be a wired transmission mode or a wireless transmission mode.
For example, if the signal is transmitted by using a wireless transmission method, the wireless communication module may be provided in each of the interface and the external control terminal. Furthermore, the micro control unit MCU receives the dimming control signal from the external control terminal through the wireless communication module in the interface and transmits the output power of the load LED to the external control terminal. And the power supply control IC sends the failure state of the power supply to the external control end through the wireless communication module in the interface.
In this embodiment, wireless communication module can adopt wireless wifi module, bluetooth module etc. the embodiment of the utility model provides a do not do specific restriction to this.
In the embodiment of the present invention, the non-isolated dimming constant current power supply further includes a diode D1 and a capacitor C1. The anode of the diode D1 is connected with the drain of the MOS tube, the cathode is connected with the cathode of the load LED, the anode of the capacitor C1 is connected with the anode of the load LED, and the cathode of the capacitor C1 is connected with the cathode of the load LED.
When the switching element Q1 is turned on, the output current of the load LED flows from the positive electrode of the load LED to the negative terminal, flows through the transformer T1 to the switching element Q1, and flows through the resistor R4 to the ground terminal. When the control switching element Q1 is turned off, the transformer T1 is reversed, and the output current of the load LED flows from the negative electrode of the load LED to the transformer T1 and then to the positive electrode of the load LED through the diode D1.
Based on the same utility model design, the embodiment of the utility model provides a control system is still provided, see fig. 3, control system 10 includes non-isolation dimming constant current power supply 11, interface 12, external control end 13, load LED in the arbitrary embodiment of above. Wherein,
and the interface 12 is respectively connected with the external control terminal 13 and the non-isolated dimming constant current power supply 11.
The non-isolated dimming constant current power supply 11 has an input terminal (not shown in fig. 3) connected to a power supply (not shown in fig. 3) and an output terminal (not shown in fig. 3) connected to the load LED and configured to provide a constant current to the load LED.
The non-isolated dimming constant current power supply 11 is further configured to receive a dimming control signal sent by a user through the external control terminal 13 through the interface 12, so as to adjust the magnitude of the output current Io of the load LED by using the dimming control signal. The non-isolated dimming constant current power supply 11 calculates the output power of the load LED by detecting the output voltage and the average current of the load LED, and further transmits the output power of the load LED to the external control terminal 13 through the interface 12.
The external control terminal 13 can realize signal transmission between the non-isolated dimming constant current power supply 11 through the interface 12, and the signal transmission mode may be a wired transmission mode or a wireless transmission mode. For example, if adopt wireless transmission mode to transmit signal, then can be through setting up wireless communication module respectively in interface 12 and external control end 13, wireless communication module can adopt wireless wifi module, bluetooth module etc. the embodiment of the utility model provides a do not do specific restriction to this.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments can be modified or some or all of the technical features can be equivalently replaced within the spirit and principles of the present invention; such modifications and substitutions do not depart from the scope of the present invention.
Claims (14)
1. A non-isolated dimming constant current power supply comprises a power supply control IC, a micro control unit MCU and a transformer which are respectively connected with the power supply control IC,
the micro control unit MCU is configured to receive a dimming control signal from a user, generate a corresponding PWM signal and a working mode control signal according to the dimming control signal, and send the PWM signal and the working mode control signal to the power supply control IC;
the micro control unit MCU generates a linear dimming mode control signal when the dimming power corresponding to the dimming control signal is greater than the preset power; when the dimming power corresponding to the dimming control signal is smaller than the preset power, generating an intermittent mode control signal;
if the power supply control IC receives a linear dimming mode control signal, the power supply control IC works in a linear dimming mode, converts the received PWM signal into a linear voltage signal, and adjusts the output current Io of the load LED by using the linear voltage signal; and if the intermittent mode control signal is received, working in an intermittent mode, generating a frequency signal in a preset range according to the received PWM signal, providing the frequency signal to the transformer, and adjusting the output current Io of the load LED by using the received PWM signal.
2. The non-isolated dimmed constant current power supply according to claim 1,
the micro control unit MCU is provided with a first communication port, a PWM port and a receiving port, and is configured to receive a dimming control signal from a user by using the receiving port, generate a corresponding PWM signal and a working mode control signal according to the dimming control signal, transmit the PWM signal to the power supply control IC through the PWM port, and transmit the working mode control signal to the power supply control IC through the first communication port;
the power supply control IC is provided with a PWM pin connected with the PWM port and a communication pin in communication connection with the first communication port, the PWM pin is used for receiving the PWM signal, and the communication pin is used for receiving the working mode control signal.
3. The non-isolated dimming constant current power supply according to claim 1 or 2, further comprising a driving resistor R1, a switching element, wherein,
the power supply control IC comprises a driving pin GD, the driving pin GD is connected with one end of the driving resistor R1, and the other end of the driving resistor R1 is connected with the switch element; the switching element is connected with one end of the primary side of the transformer, and the other end of the primary side of the transformer is connected with the negative electrode of the load LED;
the power supply control IC operates in an intermittent mode, and transmits a generated frequency signal in a preset range to the switching element through the driving resistor R1, and the switching element supplies the frequency signal to the transformer.
4. The non-isolated dimming constant current power supply of claim 3, wherein the switching element comprises a power field effect transistor (MOS),
the grid electrode of the power field effect transistor MOS is connected with the driving resistor R1, and the drain electrode of the power field effect transistor MOS is connected with one end of the primary side of the transformer.
5. The non-isolated dimming constant current power supply according to claim 3, further comprising a voltage dividing resistor R2 and a voltage dividing resistor R3, wherein one end of the voltage dividing resistor R3 is connected with the negative electrode of the load LED, the other end of the voltage dividing resistor R2 is connected with the ground, and the other end of the voltage dividing resistor R2 is connected with the ground;
the power control IC comprises a first detection pin, wherein the first detection pin is connected to a connection point of a voltage division resistor R2 and a voltage division resistor R3 and is configured to be used for detecting the divided voltage of the voltage division resistor R2 and then comparing the divided voltage with a preset reference voltage Vref, if the divided voltage of the voltage division resistor R2 obtained through comparison is larger than the preset reference voltage Vref, the switching element is controlled to be in a cut-off state, and the current cut-off state is kept within a preset time.
6. The non-isolated dimming constant current power supply according to claim 1 or 2, wherein an RC integration circuit is integrated in the power control IC, the power control IC operates in a linear dimming mode, converts the received PWM signal into a linear voltage signal through the RC integration circuit, and if the duty ratio of the PWM signal is increased, the value of the converted linear voltage signal is increased, the preset reference voltage Vref is increased, and the output current Io of the load LED is increased.
7. The non-isolated dimming constant current power supply of claim 5, further comprising a resistor R4, wherein one end of the resistor R4 is connected to the switching element, and the other end is grounded;
the first detection pin of the power supply control IC detects the output voltage of the load LED by detecting the voltage division of the voltage division resistor R2;
the power supply control IC comprises a CS pin which is connected with the ungrounded end of the resistor R4, and the power supply control IC works in a linear dimming mode to detect the average current of the load LED by detecting the peak current on the resistor R4 by using the CS pin;
the power supply control IC determines the output power of the load LED using the output voltage and the average current of the load LED.
8. The non-isolated dimming constant current power supply of claim 5, further comprising a resistor R4, wherein one end of the resistor R4 is connected to the switching element, and the other end is grounded;
the first detection pin of the power supply control IC detects the output voltage of the load LED by detecting the voltage division of the voltage division resistor R2;
the power supply control IC comprises a CS pin and is connected with the ungrounded end of the resistor R4, the power supply control IC works in an intermittent mode, the CS pin is used for detecting the peak voltage on the resistor R4, the peak voltage on the resistor R4 is amplified and is processed by an RC integrating circuit, and then the average current of the load LED is obtained through calculation;
the power supply control IC determines the output power of the load LED using the output voltage and the average current of the load LED.
9. The non-isolated dimming constant current power supply of claim 5, further comprising a resistor R4, a resistor R5 in series with the resistor R4;
the first detection pin of the power supply control IC detects the output voltage of the load LED by detecting the voltage division of the voltage division resistor R2;
the power supply control IC comprises a second detection pin, the second detection pin is connected to a connection point of the resistor R4 and the resistor R5, the voltage division of the resistor R5 is detected, and after the voltage division of the resistor R5 is amplified, the average current of the load LED is calculated;
the power supply control IC determines the output power of the load LED using the output voltage and the average current of the load LED.
10. The non-isolated dimming constant current power supply of any one of claims 5 and 7-9, further comprising:
the interface is respectively connected with the MCU and the external control end;
the micro control unit MCU receives the dimming control signal sent by a user through the external control end through the interface;
the power supply control IC sends the output power of the load LED to the MCU; and the micro control unit MCU is used for transmitting the received output power of the load LED to the external control end through the interface.
11. The non-isolated dimmed constant current power supply according to claim 10,
the interface is connected with the power supply control IC, the power supply control IC detects the fault state of each device connected with the power supply control IC, and the detected fault state is sent to the external control end through the interface.
12. The non-isolated dimming constant current power supply according to claim 10, wherein a wireless communication module is arranged in each of the interface and the external control terminal, and the MCU receives the dimming control signal from the external control terminal through the wireless communication module in the interface and transmits the output power of the load LED to the external control terminal.
13. The non-isolated dimmed constant current power supply according to claim 10, wherein the external control terminal comprises a mobile terminal.
14. A control system comprising an interface, an external control terminal, a load LED, the non-isolated dimming constant current power supply of any one of claims 1-13,
the interface is respectively connected with the external control end and the non-isolated dimming constant current power supply;
the non-isolated dimming constant current power supply is provided with an input end and an output end, the input end is connected with a power supply, and the output end is connected with the load LED and is configured to provide constant current for the load LED;
the non-isolated dimming constant current power supply is further configured to receive the dimming control signal sent by a user through the external control terminal through the interface so as to adjust the output current Io of the load LED by using the dimming control signal; and determining the output power of the load LED by detecting the output voltage and the average current of the load LED, and sending the output power of the load LED to the external control end through the interface.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822042535.1U CN209824074U (en) | 2018-12-06 | 2018-12-06 | Non-isolated dimming constant current power supply and control system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822042535.1U CN209824074U (en) | 2018-12-06 | 2018-12-06 | Non-isolated dimming constant current power supply and control system |
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| CN209824074U true CN209824074U (en) | 2019-12-20 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109413805A (en) * | 2018-12-06 | 2019-03-01 | 欧普照明股份有限公司 | The non-isolated light modulation constant-current supply of one kind and control system |
-
2018
- 2018-12-06 CN CN201822042535.1U patent/CN209824074U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109413805A (en) * | 2018-12-06 | 2019-03-01 | 欧普照明股份有限公司 | The non-isolated light modulation constant-current supply of one kind and control system |
| CN109413805B (en) * | 2018-12-06 | 2024-04-09 | 欧普照明股份有限公司 | Non-isolated dimming constant-current power supply and control system |
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