Constant-power driving circuit and lamp

Abstract

The utility model discloses a constant power driving circuit and a lamp, the constant power driving circuit comprises a voltage dividing module, a control module and at least one adjusting module, the voltage dividing module is connected with the control module and a power supply, the control module is connected with the adjusting module and the power supply, and each adjusting module is connected with a light-emitting device; the voltage division module is used for carrying out voltage division on the power supply to obtain first voltage; the control module is used for generating an adjusting signal according to the first voltage; and the adjusting module is used for adjusting the output current according to the adjusting signal, so that the light-emitting device works under the constant power. In the embodiment of the invention, the stability of the lighting effect and the service life of the light-emitting device can be maintained.

Description

Technical Field

[0001] The present application relates to the technical field of electronic circuits, and in particular to a constant power drive circuit and a lamp. Background Art

[0002] In lighting technology, light emitting diode (LED) lamps are widely used in various lighting occasions. Constant current drive circuits can ensure the stability and service life of LED lamps by providing constant current. However, in practical applications, when the grid voltage fluctuates greatly, the constant current drive circuit cannot effectively adapt to the voltage change, causing the output power of the LED lamp to fluctuate, thereby affecting the lighting effect and service life of the LED lamp. Utility Model Content

[0003] The embodiments of the present application disclose a constant power driving circuit and a lamp, which are used to adjust the output current according to the input voltage so as to enable the light emitting device to operate at constant power.

[0004] In a first aspect, an embodiment of the present application discloses a constant power driving circuit, including a voltage dividing module, a control module and at least one regulating module, wherein:

[0005] The voltage dividing modules are respectively connected to the control module and the power supply, the control module is respectively connected to the regulating module and the power supply, and each regulating module is connected to a light emitting device;

[0006] A voltage dividing module, used for dividing the power supply to obtain a first voltage;

[0007] A control module, configured to generate an adjustment signal according to the first voltage;

[0008] The regulating module is used to regulate the output current according to the regulating signal so that the light emitting device operates at a constant power.

[0009] As a possible implementation, the constant power driving circuit further includes a power supply module, wherein:

[0010] The power supply module is connected to the control module and the power supply respectively;

[0011] The power supply module is used to convert a first DC signal provided by a power supply into a second DC signal, and supply power to the control module according to the second DC signal, wherein the voltage of the first DC signal is greater than the voltage of the second DC signal.

[0012] As a possible implementation, the voltage divider module includes a first resistor and a second resistor, wherein: one end of the first resistor is respectively connected to one end of the second resistor and the control module, the other end of the first resistor is connected to a power supply, and the other end of the second resistor is grounded.

[0013] As a possible implementation manner, the voltage dividing module further includes a first capacitor, and the first capacitor and the second resistor are connected in parallel.

[0014] As a possible implementation, the adjustment module includes a third resistor, a fourth resistor and a first switching device, wherein: one end of the third resistor is respectively connected to one end of the fourth resistor and the first end of the first switching device, the second end of the first switching device is connected to the light-emitting device, the other end of the fourth resistor and the third end of the first switching device are respectively grounded, and the other end of the third resistor is connected to the control module.

[0015] As a possible implementation, the regulating module further includes a fifth resistor, wherein: one end of the fifth resistor is connected to the second end of the first switching device, and the other end of the fifth resistor is connected to the light-emitting device.

[0016] As a possible implementation, the regulating module further includes an anti-static suppression diode, wherein: one end of the anti-static suppression diode is connected to the second end of the first switching device, and the other end of the anti-static suppression diode is grounded.

[0017] As a possible implementation, the power supply module includes an energy storage filter unit and a low voltage difference linear regulator, wherein: the low voltage difference linear regulator is respectively connected to the energy storage filter unit and the power supply, and the energy storage filter unit is connected to the control module; the low voltage difference linear regulator is used to convert the first DC signal into a third DC signal; the energy storage filter unit is used to filter high-frequency noise in the third DC signal to obtain a second DC signal.

[0018] As a possible implementation manner, the power supply module further includes a fourth capacitor, wherein: one end of the fourth capacitor is respectively connected to the low voltage difference linear regulator and the power supply, and the other end of the fourth capacitor is grounded.

[0019] In a second aspect, an embodiment of the present application discloses a lamp, comprising at least one light-emitting device and the constant power driving circuit disclosed in the first aspect.

[0020] In the embodiment of the present application, the constant power driving circuit includes a voltage dividing module, a control module and at least one regulating module, wherein: the voltage dividing module is respectively connected to the control module and the power supply, the control module is respectively connected to the regulating module and the power supply, and each regulating module is connected to a light-emitting device; the voltage dividing module is used to divide the power supply to obtain a first voltage; the control module is used to generate a regulating signal according to the first voltage; the regulating module is used to adjust the output current according to the regulating signal so that the light-emitting device works at a constant power. It can be seen that the voltage dividing module can adjust the voltage of the power supply to a more suitable first voltage, the control module can generate a regulating signal according to the first voltage, that is, the regulating signal can be dynamically adjusted according to the change of the first voltage, and the regulating module can adjust the current of the light-emitting device controlled by it according to the regulating signal, which can ensure that even when the input voltage fluctuates, the light-emitting device can work at a constant power, thereby maintaining the stability of the lighting effect and the service life of the light-emitting device. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 is a structural schematic diagram of a lamp disclosed in an embodiment of the present application;

[0023] Figure 2 It is a structural schematic diagram of a constant power driving circuit disclosed in an embodiment of the present application;

[0024] Figure 3 It is a structural schematic diagram of another constant power driving circuit disclosed in an embodiment of the present application;

[0025] Figure 4 It is a structural schematic diagram of a voltage divider module disclosed in an embodiment of the present application;

[0026] Figure 5 is a structural schematic diagram of another voltage divider module disclosed in an embodiment of the present application;

[0027] Figure 6 It is a structural schematic diagram of a regulating module disclosed in an embodiment of the present application;

[0028] Figure 7 It is a structural schematic diagram of another regulating module disclosed in an embodiment of the present application;

[0029] Figure 8 It is a structural schematic diagram of another adjustment module disclosed in the embodiment of the present application;

[0030] Fig. 9 It is a structural schematic diagram of a power supply module disclosed in an embodiment of the present application;

[0031] Fig.10 It is a structural schematic diagram of another power supply module disclosed in an embodiment of the present application;

[0032] Fig.11 It is a schematic diagram of the structure of another lamp disclosed in an embodiment of the present application. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

[0034] The embodiments of the present application disclose a constant power driving circuit and a lamp, which are used to adjust the output current according to the input voltage so as to realize the light emitting device to work at a constant power.

[0035] In order to better understand the embodiments of the present application, the relevant technologies of the embodiments of the present application are described below.

[0036] See also Figure 1 , Figure 1 Schematic diagram of the structure of a lamp disclosed in the embodiment of the present application. Figure 1 As shown, the lamp may include a power supply, a constant current driving circuit and a light emitting device, wherein the power supply is connected to the light emitting device through the constant current driving circuit. The power supply may provide necessary electrical energy to drive the light emitting device. The constant current driving circuit may ensure that the current flowing to the light emitting device remains constant, thereby ensuring the stability of the light emitting device.

[0037] However, if the voltage of the power supply exceeds the preset processing range, certain components in the constant current drive circuit (such as resistors, capacitors, voltage regulators, etc.) need to be replaced or adjusted to match the new voltage requirements to adapt to the voltage change.

[0038] In order to solve the above problems, the present application designs a constant power driving circuit, including a voltage dividing module, a control module and at least one regulating module, wherein: the voltage dividing module is respectively connected to the control module and the power supply, the control module is respectively connected to the regulating module and the power supply, and each regulating module is connected to a light-emitting device; the voltage dividing module is used to divide the power supply to obtain a first voltage; the control module is used to generate a regulating signal according to the first voltage; the regulating module is used to adjust the output current according to the regulating signal, so that the light-emitting device works at a constant power. It can be seen that the voltage dividing module can adjust the voltage of the power supply to a more suitable first voltage, the control module can generate a regulating signal according to the first voltage, that is, the regulating signal can be dynamically adjusted according to the change of the first voltage, and the regulating module can adjust the current of the light-emitting device controlled by it according to the regulating signal, which can ensure that even when the input voltage fluctuates, the light-emitting device can work at a constant power, thereby maintaining the stability of the lighting effect and the service life of the light-emitting device.

[0039] See also Figure 2 , Figure 2 Schematic diagram of a constant power drive circuit disclosed in an embodiment of the present application. Figure 2 As shown, the constant power driving circuit may include a voltage dividing module, a control module and at least one regulating module.

[0040] The voltage dividing modules are respectively connected to the control module and the power supply, the control module is respectively connected to the regulating module and the power supply, and each regulating module is connected to a light emitting device.

[0041] The input end of the voltage divider module is connected to the positive input end of the power supply, and the negative input end of the power supply is grounded, and the voltage divider module can divide the power supply to obtain the first voltage, that is, the voltage divider module can reduce the voltage of the power supply to the first voltage.

[0042] The output end of the voltage divider module is connected to the signal input end of the control module. The control module can receive the first voltage from the voltage divider module through the signal input end, and the control module can generate an adjustment signal according to the first voltage. The signal output end of the control module is connected to the input end of the adjustment module, and the control module can send the adjustment signal to the adjustment module through the signal output end. The adjustment module can adjust the output current according to the adjustment signal so that the light-emitting device works at a constant power.

[0043] Since the first voltage is a voltage division of the voltage of the power supply, the first voltage is positively correlated with the voltage of the power supply. Since the first voltage is positively correlated with the voltage of the power supply, when the voltage of the power supply changes, the first voltage will also change. It can be seen that the first voltage increases as the voltage of the power supply increases, and decreases as the voltage of the power supply decreases. The power supply of the light-emitting device is the product of the power supply current of the light-emitting device and the power supply voltage. When the voltage of the power supply increases, the power supply voltage of the light-emitting device increases. In order to ensure that the power supply power of the light-emitting device remains constant, the control module can generate a first adjustment signal according to the first voltage, so that the adjustment module can reduce the power supply current of the light-emitting device according to the first adjustment signal. When the voltage of the power supply decreases, the power supply voltage of the light-emitting device decreases. In order to ensure that the power supply power of the light-emitting device remains constant, the control module can generate a second adjustment signal according to the first voltage, so that the adjustment module can increase the power supply current of the light-emitting device according to the second adjustment signal.

[0044] It can be seen that when the voltage of the power supply increases, the power supply current of the light-emitting device is reduced, and when the voltage of the power supply decreases, the power supply current of the light-emitting device is increased, so as to ensure that the power supply power of the light-emitting device remains constant.

[0045] It should be understood that the connection in the present application may be an electrical connection.

[0046] exist Figure 2 The described constant power driving circuit includes a voltage divider module, a control module and at least one adjustment module, wherein: the voltage divider module is respectively connected to the control module and the power supply, the control module is respectively connected to the adjustment module and the power supply, and each adjustment module is connected to a light-emitting device; the voltage divider module is used to divide the power supply to obtain a first voltage; the control module is used to generate an adjustment signal according to the first voltage; the adjustment module is used to adjust the output current according to the adjustment signal, so that the light-emitting device works at a constant power. It can be seen that the voltage divider module can adjust the voltage of the power supply to a more suitable first voltage, the control module can generate an adjustment signal according to the first voltage, that is, the adjustment signal can be dynamically adjusted according to the change of the first voltage, and the adjustment module can adjust the current of the light-emitting device controlled by it according to the adjustment signal, which can ensure that even when the input voltage fluctuates, the light-emitting device can work at a constant power, thereby maintaining the stability of the lighting effect and the service life of the light-emitting device.

[0047] See also Figure 3 , Figure 3 is a schematic diagram of another constant power driving circuit disclosed in an embodiment of the present application. Figure 3 The constant power drive circuit shown is composed of Figure 2 The constant power drive circuit shown is optimized. Figure 3 As shown, the constant power driving circuit may further include a power supply module.

[0048] The power supply module is connected to the control module and the power supply respectively.

[0049] Since the operating voltage required by the control module is different from the voltage provided by the power supply, in order to ensure that the control module can work normally, the power supply module can convert the first DC signal provided by the power supply into a second DC signal, and then the control module can be powered according to the second DC signal. The voltage of the first DC signal is greater than the voltage of the second DC signal. For example, assuming that the voltage provided by the power supply is 24V, and the operating voltage required by the control module is 3.3V, the power supply module can convert the 24V DC signal provided by the power supply (i.e., the first DC signal) into a 3.3V DC signal (i.e., the second DC signal), and then the control module can be powered according to the 3.3V DC signal to ensure that the control module can work normally.

[0050] See also Figure 4 , Figure 4 Schematic diagram of a voltage divider module disclosed in the embodiment of the present application. Figure 4 As shown, the voltage dividing module may include a first resistor R1 and a second resistor R2.

[0051] One end of the first resistor R1 is respectively connected to one end of the second resistor R2 and the control module, the other end of the first resistor R1 is connected to a power supply, and the other end of the second resistor R2 is grounded.

[0052] When the voltage of the power supply changes, the voltage at point A can be changed by voltage division by the first resistor R1 and the second resistor R2 to obtain a first voltage.

[0053] The first voltage can be expressed as follows:

[0054]

[0055] Wherein, V2 represents the first voltage, V1 represents the voltage of the power supply, R1 represents the resistance value of the first resistor R1, and R2 represents the resistance value of the first resistor R2.

[0056] It can be seen from the above formula that the first voltage is proportional to the voltage of the power supply.

[0057] See also Figure 5 , Figure 5 is a schematic diagram of the structure of another voltage divider module disclosed in the embodiment of the present application. Figure 5 The voltage divider module shown is composed of Figure 4 The voltage divider module shown is optimized. Figure 5 As shown, the voltage dividing module may further include a first capacitor C1. The first capacitor C1 is connected in parallel with a second resistor R2.

[0058] The first capacitor C1 connected in parallel to the second resistor R2 can stabilize the voltage. The first capacitor C1 can store charge and release it when needed, helping to balance the peaks and valleys in the voltage, thereby providing a more stable voltage output. The first capacitor C1 can also filter out high-frequency noise in the DC signal.

[0059] See also Figure 6 , Figure 6 Schematic diagram of a structure of a regulating module disclosed in the embodiment of the present application. Figure 6 As shown, the regulating module may include a third resistor R3, a fourth resistor R4 and a first switch device Q1.

[0060] One end of the third resistor R3 is respectively connected to one end of the fourth resistor R4 and the first end of the first switch device Q1, the second end of the first switch device Q1 is connected to the light-emitting device, the other end of the fourth resistor R4 and the third end of the first switch device Q1 are respectively grounded, and the other end of the third resistor R3 is connected to the control module.

[0061] The first switch device Q1 may be a metal oxide semiconductor (MOS) tube, or other devices with equivalent functions. Figure 6 The description is made by taking the first switch device Q1 as a MOS tube as an example.

[0062] When the first switch device Q1 is a MOS tube, the gate of the MOS tube is the first end of the first switch device Q1, the drain of the MOS tube is the second end of the first switch device Q1, and the source of the MOS tube is the third end of the first switch device Q1.

[0063] The control module may be a microcontroller unit (MCU). Since P=V*I, where P is power, V is voltage, and I is current, in order to ensure constant power, the MCU may generate a regulation signal according to the first voltage so that the regulation module regulates the current according to the regulation signal. The regulation signal may be a pulse width modulation (PWM) signal.

[0064] When the MCU detects that the first voltage is higher than the preset voltage, the MCU can generate a first adjustment signal for reducing the output current according to the first voltage, such as reducing the duty cycle of the PWM signal to reduce the on-time of the first switching device Q1; when the MCU detects that the first voltage is lower than the preset voltage, the MCU can generate a second adjustment signal for increasing the output current according to the first voltage, such as increasing the duty cycle of the PWM signal to increase the on-time of the first switching device Q1, so that the light-emitting device operates at constant power.

[0065] See also Figure 7 , Figure 7 It is a structural schematic diagram of another adjustment module disclosed in an embodiment of the present application. Figure 7 The regulation module shown consists of Figure 6 The regulation module shown in the figure is optimized. Figure 7 As shown, the regulating module may further include a fifth resistor R5.

[0066] One end of the fifth resistor R5 is connected to the second end of the first switch device Q1 , and the other end of the fifth resistor R5 is connected to the light emitting device.

[0067] The fifth resistor R5 is used as a current limiting resistor to protect the light emitting device connected thereto, prevent excessive current from flowing through the light emitting device, and avoid damage to the light emitting device due to current overload.

[0068] See also Figure 8 , Figure 8 is a structural diagram of another regulating module disclosed in the embodiment of the present application. Figure 8 The regulation module shown consists of Figure 7 The regulation module shown is optimized. Figure 8 As shown,

[0069] The regulating module may further include an anti-static suppression diode ED1 .

[0070] One end of the anti-static suppression diode ED1 is connected to the second end of the first switch device Q1 , and the other end of the anti-static suppression diode ED1 is grounded.

[0071] The electrostatic charge can be introduced into the ground terminal through the anti-static suppression diode ED1, so as to protect the first switch device Q1 from the influence of electrostatic discharge, thereby avoiding damage to sensitive components in the circuit.

[0072] See also Fig. 9 , Fig. 9 Schematic diagram of a power supply module disclosed in the embodiment of the present application. Fig. 9 As shown, the power supply module includes an energy storage filter unit and a low voltage drop linear regulator.

[0073] The low voltage difference linear regulator is connected to the energy storage filter unit and the power supply respectively, and the energy storage filter unit is connected to the control module.

[0074] The low voltage drop linear regulator can convert the first DC signal into a third DC signal. When the first DC signal is unstable, the low voltage drop linear regulator can provide an accurate and stable third DC signal, which can provide an accurate and stable operating voltage for the control module.

[0075] The energy storage filter unit can filter high-frequency noise in the third DC signal to obtain a second DC signal. The energy storage filter unit can store energy in the circuit and release it quickly when needed. The power supply can be kept stable when the power supply is momentarily insufficient or the load increases suddenly. The energy storage filter unit can also smooth out the peaks and drops in the power supply voltage to provide a more stable voltage output.

[0076] In some embodiments, the energy storage filter unit may include a second capacitor C2 and a third capacitor C3. One end of the second capacitor C2 is connected to the low voltage drop linear regulator and the control module respectively, and the other end of the second capacitor C2 is grounded. The third capacitor C3 is connected in parallel with the second capacitor C2.

[0077] Among them, the capacitance values ​​of the second capacitor C2 and the third capacitor C3 are different. The second capacitor C2 has a larger capacitance value, which can filter out low-frequency noise, smooth the lower frequency components in the voltage ripple, and provide a larger energy storage for the circuit, so that the voltage can be maintained stable when the instantaneous load changes. The third capacitor C3 has a smaller capacitance value, which can filter out high-frequency noise, handle higher frequency spikes, and respond quickly to high-frequency changes.

[0078] Exemplarily, the second capacitor C2 may be a capacitor with a capacitance value ranging from microfarad level to millifarad level, and the third capacitor C3 may be a capacitor with a capacitance value ranging from picofarad level to nanofarad level.

[0079] It should be understood that the second capacitor C2 may include one capacitor or multiple capacitors. When the second capacitor C2 includes multiple capacitors, the second capacitor C2 may be formed by connecting the multiple capacitors in parallel. The third capacitor C3 may include one capacitor or multiple capacitors. When the third capacitor C3 includes multiple capacitors, the third capacitor C3 may be formed by connecting the multiple capacitors in parallel.

[0080] See also Fig.10 , Fig.10 is a schematic diagram of the structure of another power supply module disclosed in the embodiment of the present application. Fig.10 The power supply module shown consists of Fig. 9 The power supply module shown is optimized. Fig.10 As shown, the power supply module may further include a fourth capacitor C4.

[0081] One end of the fourth capacitor C4 is connected to the low voltage drop linear regulator and the power supply respectively, and the other end of the fourth capacitor C4 is grounded.

[0082] The fourth capacitor C4 can not only be used as a filtering element to protect the low voltage dropout linear regulator from the influence of input voltage fluctuations, but also be used as an energy storage element to provide voltage support when the power supply is temporarily unstable.

[0083] The present application embodiment discloses a lamp, please refer to Fig.11 , Fig.11 is a schematic diagram of the structure of another lamp disclosed in the embodiment of the present application. Fig.11 As shown, the lamp may include at least one light emitting device and a constant power driving circuit. Fig.11 Take the example of a lamp comprising a light emitting device.

[0084] The detailed description of the constant power driving circuit may refer to the above description.

[0085] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A constant power driving circuit, characterized in that: It includes a voltage dividing module, a control module and at least one regulating module, wherein: The voltage dividing modules are respectively connected to the control module and the power supply, the control modules are respectively connected to the regulating modules and the power supply, and each regulating module is connected to a light emitting device; The voltage dividing module is used to divide the power supply to obtain a first voltage; The control module is used to generate a regulation signal according to the first voltage; The regulating module is used to regulate the output current according to the regulating signal so that the light emitting device operates at a constant power.

2. The constant power driving circuit according to claim 1, characterized in that: The constant power driving circuit further includes a power supply module, wherein: The power supply module is connected to the control module and the power supply respectively; The power supply module is used to convert the first DC signal provided by the power supply into a second DC signal, and supply power to the control module according to the second DC signal, wherein the voltage of the first DC signal is greater than the voltage of the second DC signal.

3. The constant power driving circuit according to claim 1, characterized in that: The voltage divider module includes a first resistor and a second resistor, wherein: One end of the first resistor is respectively connected to one end of the second resistor and the control module, the other end of the first resistor is connected to a power supply, and the other end of the second resistor is grounded.

4. The constant power driving circuit according to claim 3, characterized in that: The voltage dividing module further includes a first capacitor, and the first capacitor and the second resistor are connected in parallel.

5. The constant power driving circuit according to claim 1, characterized in that: The regulating module includes a third resistor, a fourth resistor and a first switch device, wherein: One end of the third resistor is respectively connected to one end of the fourth resistor and the first end of the first switching device, the second end of the first switching device is connected to the light-emitting device, the other end of the fourth resistor and the third end of the first switching device are respectively grounded, and the other end of the third resistor is connected to the control module.

6. The constant power driving circuit according to claim 5, characterized in that: The regulating module further includes a fifth resistor, wherein: One end of the fifth resistor is connected to the second end of the first switch device, and the other end of the fifth resistor is connected to the light emitting device.

7. The constant power driving circuit according to claim 6, characterized in that: The regulating module also includes an anti-static suppression diode, wherein: One end of the anti-static suppression diode is connected to the second end of the first switch device, and the other end of the anti-static suppression diode is grounded.

8. The constant power driving circuit according to claim 2, characterized in that: The power supply module includes an energy storage filter unit and a low voltage drop linear regulator, wherein: The low voltage difference linear regulator is connected to the energy storage filter unit and the power supply respectively, and the energy storage filter unit is connected to the control module; The low voltage drop linear regulator is used to convert the first direct current signal into a third direct current signal; The energy storage filter unit is used to filter high-frequency noise in the third direct current signal to obtain a second direct current signal.

9. The constant power driving circuit according to claim 8, characterized in that: The power supply module further includes a fourth capacitor, wherein: One end of the fourth capacitor is connected to the low voltage drop linear regulator and the power supply respectively, and the other end of the fourth capacitor is grounded.

10. A lamp, characterized in that: The invention comprises at least one light emitting device and a constant power driving circuit as claimed in any one of claims 1 to 9.

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