Segmented two-stage driving circuit and lighting device

Abstract

The utility model provides a segmented two-stage drive circuit and a lighting device, and relates to the technical field of lighting drive circuits, and the circuit comprises a rectification module which is used for being connected with commercial power; the boosting module is connected with the output end of the rectifying module; the voltage regulating module is connected with the output end of the boosting module; the input voltage detection module is connected with the input end of the boosting module; and the segmented adjustment feedback module is connected with the input voltage detection module, and the segmented adjustment feedback module is connected with the controlled end of the boost module. Based on the range of the input voltage of the boost module, the feedback module is adjusted in a segmented mode to generate the segmented signals of the corresponding voltage value grades, so that the output voltage grades of the boost module correspond to the segmented signals, the effect that the output voltage grades of the boost module dynamically change in a segmented mode is achieved, and under the condition that the input voltage is small, the output voltage grade of the boost module changes dynamically. The output voltage level of the boost module is low, so that the switching loss of switching tubes in the boost module and the voltage regulating module is reduced, and the utilization efficiency of electric energy is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lighting drive circuits, and in particular to a segmented secondary drive circuit and a lighting device. Background Art

[0002] LED lighting is widely used in various scenarios due to its advantages of good lighting effect and high efficiency. LED lighting devices usually include a driving circuit and a lighting component, in which a two-stage topology architecture of a boost circuit and a voltage regulator circuit is widely used in the driving circuit. The boost circuit part of the front stage boosts the voltage, and the voltage regulator circuit part of the rear stage adjusts the boost output voltage to a voltage range suitable for the operation of the lighting component.

[0003] When the boost circuit is working normally, the output voltage cannot be too low, and a minimum voltage difference is required between the input voltage and the output voltage, that is, the output voltage of the boost circuit needs to exceed the minimum voltage difference threshold of the input voltage. In the prior art, considering the fluctuation of the mains power grid, the AC voltage provided by the grid is 220V±20%, that is, the maximum AC fluctuation error is 264V, and the peak voltage of 264V AC is 264×√2=373V. In addition to the minimum voltage difference threshold, the output voltage of the boost circuit is usually set at 400V DC to ensure that the boost circuit can work normally.

[0004] However, the switching loss of the switch tube will increase as the voltage increases. When the output voltage of the boost circuit is fixed at a higher value, the switch tubes in the boost circuit and the voltage regulation circuit will have higher switching losses, resulting in increased energy loss, which is not conducive to improving efficiency. Utility Model Content

[0005] The utility model provides a segmented secondary driving circuit and a lighting device, which are used to solve the defects of large switch loss and low efficiency in the secondary driving circuit in the prior art.

[0006] The utility model provides a segmented two-level driving circuit, comprising:

[0007] A rectifier module, the input end of which is used to be connected to the mains;

[0008] A boost module, the input end of the boost module is connected to the output end of the rectifier module;

[0009] A voltage regulating module, wherein the input end of the voltage regulating module is connected to the output end of the boost module, and the output end of the voltage regulating module is used to be connected to a load;

[0010] An input voltage detection module connected to the input end of the boost module;

[0011] A segmented regulation feedback module, wherein the input end of the segmented regulation feedback module is connected to the input voltage detection module, the segmented regulation feedback module is connected to the controlled end of the boost module, and the segmented regulation feedback module is used to generate a segmented signal, and the segmented signal is used to control the output voltage level of the boost module;

[0012] The segmented signal has at least two levels of voltage values, and the voltage value of the segmented signal corresponds to the range segment to which the input voltage detected by the input voltage detection module belongs.

[0013] According to a segmented secondary drive circuit provided by the utility model, the segmented regulation feedback module includes a control unit, a parallel resistance adjustment unit and a voltage divider unit, the control unit is respectively connected to the input voltage detection module and the parallel resistance adjustment unit, the voltage divider unit is connected to the controlled end of the boost module, the parallel resistance adjustment unit is connected to the voltage divider unit, and the parallel resistance adjustment unit is used to change the voltage divider resistance value of the voltage divider unit.

[0014] According to a segmented secondary drive circuit provided by the utility model, the control unit includes a hysteresis comparison subunit, the hysteresis comparison subunit is connected to the input voltage detection module, the hysteresis comparison subunit is provided with a voltage rising trigger threshold and a voltage falling trigger threshold, and the voltage rising trigger threshold is not equal to the voltage falling trigger threshold.

[0015] According to a segmented secondary drive circuit provided by the utility model, the voltage dividing unit includes a first voltage dividing resistor and a second voltage dividing resistor, one end of the first voltage dividing resistor is connected to the output end of the boost module, the other end of the first voltage dividing resistor is respectively connected to the controlled end of the boost module, one end of the second voltage dividing resistor and the parallel resistance adjustment unit, and the other end of the second voltage dividing resistor is grounded.

[0016] According to a segmented secondary drive circuit provided by the utility model, the parallel resistance adjustment unit includes at least one group of resistance adjustment circuits, the resistance adjustment circuit includes a switch tube and a parallel resistor, one end of the parallel resistor is respectively connected to the controlled end of the boost module, the other end of the first voltage-dividing resistor and one end of the second voltage-dividing resistor, the other end of the parallel resistor is connected to one end of the switch tube, the other end of the switch tube is grounded, and the control unit is connected to the controlled end of the switch tube.

[0017] According to a segmented secondary drive circuit provided by the utility model, the resistance adjustment circuit also includes a pull-down resistor, one end of the pull-down resistor is respectively connected to the control unit and the controlled end of the switch tube, and the other end of the pull-down resistor is grounded.

[0018] According to a segmented two-level driving circuit provided by the utility model, the resistance adjustment circuit further includes a current limiting resistor, and the control unit is connected to the controlled end of the switch tube through the current limiting resistor.

[0019] According to a segmented secondary drive circuit provided by the utility model, the input voltage detection module includes a filter capacitor, a third voltage-dividing resistor and a fourth voltage-dividing resistor, one end of the filter capacitor is respectively connected to the input end of the boost module and one end of the third voltage-dividing resistor, the other end of the third voltage-dividing resistor is respectively connected to the fourth voltage-dividing resistor and the segmented adjustment feedback module, and the other end of the filter capacitor and the other end of the fourth voltage-dividing resistor are grounded.

[0020] According to a segmented secondary drive circuit provided by the utility model, the input voltage detection module also includes a diode, the anode of the diode is connected to the input end of the boost module, and the cathode of the diode is respectively connected to one end of the filter capacitor and one end of the third voltage-dividing resistor.

[0021] The utility model also provides a lighting device, comprising: the above-mentioned segmented two-level driving circuit, and also comprising a lighting component, and the output end of the voltage regulating module is connected to the lighting component.

[0022] The utility model provides a segmented secondary drive circuit and lighting device, which have at least the following beneficial effects: the rectifier module rectifies the city power and transmits it to the boost module, the boost module boosts the input power and transmits it to the voltage regulating module, the voltage regulating module adjusts the voltage to a suitable range for driving the load, and realizes the function of driving the load, such as the lighting component, to work normally. At the same time, the input voltage of the boost module is detected by the input voltage detection module, and the segmented adjustment feedback module generates a corresponding segmented signal according to the range segment to which the input voltage detected by the input voltage module belongs. The voltage value level of the segmented signal is related to the voltage value range of the input voltage, and the output voltage of the boost module is determined according to the voltage value of the controlled end, that is, the voltage value level of the segmented signal corresponds to the output voltage level of the boost module. In this way, through the range segment based on the input voltage of the boost module, the segmented regulation feedback module generates a segmented signal of the corresponding voltage value level, so that the output voltage level of the boost module corresponds to the segmented signal, thereby achieving the effect of segmented dynamic change of the output voltage level of the boost module. When the range segment to which the input voltage belongs is small, the output voltage level of the boost module is low, which is beneficial to reducing the switching loss of the switching tube in the boost module and the voltage regulation module, and improving the energy utilization efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 This is a structural block diagram of one embodiment of a segmented secondary drive circuit provided by the utility model;

[0025] Figure 2 This is a circuit diagram of one embodiment of a segmented secondary drive circuit provided by the utility model;

[0026] Figure 3 The utility model provides a circuit diagram of another embodiment of a segmented secondary drive circuit.

[0027] Reference numerals:

[0028] The rectifier module 100 , the boost module 200 , the voltage regulating module 300 , the input voltage detection module 400 , the segmented regulation feedback module 500 , the control unit 510 , the parallel resistance regulating unit 520 , the resistance regulating circuit 521 , and the voltage dividing unit 530 . DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solutions and advantages of this application clearer, the technical solutions in this application will be clearly and completely described below in conjunction with the drawings in this application. Obviously, the described embodiments are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0030] Combine the following Figure 1-Figure 3 A segmented secondary driving circuit of the present application is described, comprising:

[0031] A rectifier module 100, wherein the input end of the rectifier module 100 is used to be connected to the mains;

[0032] A boost module 200, wherein the input end of the boost module 200 is connected to the output end of the rectifier module 100;

[0033] A voltage regulating module 300, wherein the input end of the voltage regulating module 300 is connected to the output end of the boost module 200, and the output end of the voltage regulating module 300 is used to be connected to a load;

[0034] An input voltage detection module 400 connected to the input end of the boost module 200;

[0035] A segmented regulation feedback module 500, wherein the input end of the segmented regulation feedback module 500 is connected to the input voltage detection module 400, the segmented regulation feedback module 500 is connected to the controlled end of the boost module 200, and the segmented regulation feedback module 500 is used to generate a segmented signal, and the segmented signal is used to control the output voltage level of the boost module 200;

[0036] The segmented signal has at least two levels of voltage values, and the voltage values ​​of the segmented signal correspond to the range segment to which the input voltage detected by the input voltage detection module 400 belongs.

[0037] The rectifier module 100 rectifies the city power and transmits it to the boost module 200. The boost module 200 boosts the input power and transmits it to the voltage regulating module 300. The voltage regulating module 300 adjusts the voltage to a suitable range for driving the load, thereby driving the load, such as the lighting device, to work normally. At the same time, the input voltage of the boost module 200 is detected by the input voltage detection module 400. The segmented adjustment feedback module 500 generates a corresponding segmented signal according to the range segment to which the input voltage detected by the input voltage module belongs. The voltage value level of the segmented signal is related to the voltage value range of the input voltage. The output voltage of the boost module 200 is determined according to the voltage value of the controlled end, that is, the voltage value level of the segmented signal corresponds to the output voltage level of the boost module 200.

[0038] In this way, by using the range segment based on the input voltage of the boost module 200, the segmented regulation feedback module 500 generates a segmented signal of the corresponding voltage value level, so that the output voltage level of the boost module 200 corresponds to the segmented signal, thereby achieving the effect of segmented dynamic change of the output voltage level of the boost module 200. When the range segment to which the input voltage belongs is small, the output voltage level of the boost module 200 is low, which is beneficial to reducing the switching loss of the switching tube in the boost module 200 and the voltage regulation module 300, and improving the energy utilization efficiency.

[0039] In order to facilitate the understanding of the segmented signal, an example is given for illustration. In some embodiments of the present application, when the input voltage of the boost module 200 is within the range below 240V, the voltage value of the segmented signal is the first level, such as 5V, which correspondingly makes the output voltage level of the boost module 200 350V; when the input voltage of the boost module 200 is within the range above 240V, the voltage value level of the segmented signal is the second level, such as 10V, which correspondingly makes the output voltage level of the boost module 200 400V. In this way, the output voltage of the boost module 200 can be dynamically segmented. The above is just an example. In actual application, the segmented signal can include more voltage value levels, and the output voltage level of the boost module 200 can also be more correspondingly.

[0040] In some embodiments of the present application, the boost module 200 may be an implementation of a circuit having a boost function, such as a Boost circuit or a power factor correction PFC circuit, and devices such as a single-chip microcomputer and a PFC control chip; the voltage regulating module 300 may be an implementation of a circuit including an isolated flyback voltage regulating circuit, a non-isolated flyback voltage regulating circuit or a step-down Buck voltage regulating circuit, to achieve the function of regulating the output voltage of the boost module 200 so that the output driving voltage meets the rated operating voltage requirement of the lighting component.

[0041] It is understandable that the boost module 200 and the voltage regulating module 300 include switch tubes, such as Figure 2 and Figure 3 As shown, the boost module 200 includes a switch tube Q1; the switch tube may also be integrated in the chip, such as Figure 2 As shown, in some embodiments of the present application, when the voltage regulating module 300 adopts a flyback voltage regulating circuit, the flyback control chip in the flyback voltage regulating circuit can be a chip of model BP3337D with an internal integrated switch tube.

[0042] refer to Figure 2 and Figure 3 In some embodiments of a segmented secondary drive circuit of the present application, the segmented regulation feedback module 500 includes a control unit 510, a parallel resistance adjustment unit 520 and a voltage divider unit 530, the control unit 510 is respectively connected to the input voltage detection module 400 and the parallel resistance adjustment unit 520, the voltage divider unit 530 is connected to the controlled end of the boost module 200, the parallel resistance adjustment unit 520 is connected to the voltage divider unit 530, and the parallel resistance adjustment unit 520 is used to change the voltage divider resistance value of the voltage divider unit 530.

[0043] The control unit 510 controls the parallel resistance adjustment unit 520 to change the voltage-dividing resistance of the voltage-dividing resistor according to the input voltage detected by the input voltage detection module 400. Due to the change in the voltage-dividing resistance, the voltage input from the voltage-dividing unit 530 to the controlled end of the boost module 200 will also change accordingly, thereby realizing the generation of a segmented signal with a voltage value level. In this way, by changing the resistance value in parallel, the voltage value formed by the voltage-dividing unit 530 changes in the form of a level, that is, a segmented signal is generated. Since the change in the voltage-dividing resistance value is very stable and reliable due to the parallel connection, the voltage value level of the segmented signal can also be stable and reliable.

[0044] For the case where the segmented signal has multiple voltage value levels, the parallel resistance adjustment unit 520 can be formed by incorporating a corresponding number of resistors, such as one resistor in parallel for the first level and two resistors in parallel for the second level, so that the voltage-dividing resistance value corresponds to the voltage value level of the segmented signal.

[0045] In some embodiments of a segmented secondary drive circuit of the present application, the control unit 510 includes a hysteresis comparison subunit, which is connected to the input voltage detection module 400, and the hysteresis comparison subunit is provided with a voltage rising trigger threshold and a voltage falling trigger threshold, and the voltage rising trigger threshold is not equal to the voltage falling trigger threshold.

[0046] Considering the impact of input voltage fluctuation, in order to avoid the input voltage fluctuating between the interval values ​​of the two range segments, causing the control unit 510 to frequently control the parallel resistance adjustment unit 520 to act. The control unit 510 includes a hysteresis comparison subunit. When the input voltage detected by the input voltage detection module 400 rises and is greater than the voltage rise trigger threshold, the hysteresis comparison subunit enables the control unit 510 to control the parallel resistance adjustment unit 520 to change the voltage-dividing resistance value. When the input voltage drops, it needs to be less than the voltage drop trigger threshold. The hysteresis comparison subunit will enable the control unit 510 to control the parallel resistance adjustment unit 520 to cancel the change of the voltage-dividing resistance value. In this way, the control of the parallel resistance adjustment unit 520 to act and cancel the action corresponds to the voltage rise trigger value and the voltage drop trigger value, respectively, that is, the action and the cancellation action correspond to different voltage values. When the fluctuation amplitude of the input voltage does not cross the voltage rise trigger threshold and the voltage drop trigger threshold, the control unit 510 will not control the parallel resistance adjustment unit 520 to act or cancel the action, so as to avoid the situation where the parallel resistance adjustment unit 520 frequently acts due to voltage fluctuation.

[0047] It can be understood that for the case where the segmented signal has more than two voltage value levels, the hysteresis comparison subunit needs to correspond to the voltage value levels, that is, for each voltage value level of the segmented signal, a corresponding voltage rising trigger threshold and a voltage falling trigger threshold need to be set so that each voltage value level will not frequently jump due to voltage fluctuations.

[0048] The control unit 510 can be an implementation of devices including a single-chip microcomputer, an embedded chip, etc. The hysteresis comparison subunit in the control unit 510 can be an implementation of devices such as a Schmitt trigger. During the process of input voltage rising, the Schmitt trigger outputs a high level when the voltage is greater than the voltage rising trigger threshold, and during the process of input voltage falling, the Schmitt trigger outputs a low level when the voltage is less than the voltage falling trigger threshold. In this way, as long as the fluctuation amplitude of the input voltage is less than the difference between the voltage rising trigger threshold and the voltage falling trigger threshold, the output level of the Schmitt trigger will not change, thereby avoiding the control unit 510 from frequently controlling the parallel resistance adjustment unit 520 to operate due to input voltage fluctuations.

[0049] In some embodiments, when the control unit 510 includes a device with processing functions such as a single-chip microcomputer and an embedded chip, the hysteresis comparison subunit may also have a functional program in the processing function device to achieve the same function as the Schmitt trigger.

[0050] refer to Figure 2 and Figure 3 In some embodiments of a segmented secondary drive circuit of the present application, the voltage dividing unit 530 includes a first voltage dividing resistor R1 and a second voltage dividing resistor R2, one end of the first voltage dividing resistor R1 is connected to the output end of the boost module 200, the other end of the first voltage dividing resistor R1 is respectively connected to the controlled end of the boost module 200, one end of the second voltage dividing resistor R2 and the parallel resistance adjustment unit 520, and the other end of the second voltage dividing resistor R2 is grounded.

[0051] One end of the first voltage-dividing resistor R1 is connected to the output end of the boost module 200 as a voltage source for voltage division. The voltage-dividing circuit formed by the first voltage-dividing resistor R1 and the second voltage-dividing resistor R2 divides the output voltage of the boost module 200 to form a segmented signal input to the controlled end of the boost module 200. The control unit 510 changes the voltage-dividing resistance value of the voltage-dividing circuit by controlling the parallel resistance adjustment unit 520 to be connected in parallel with the second voltage-dividing resistor R2, thereby causing the segmented signal to change to different voltage value levels.

[0052] refer to Figure 2 and Figure 3 In some embodiments of a segmented secondary drive circuit of the present application, the parallel resistance adjustment unit 520 includes at least one group of resistance adjustment circuits 521, and the resistance adjustment circuit 521 includes a switch tube Q2 and a parallel resistor R7, one end of the parallel resistor R7 is respectively connected to the controlled end of the boost module 200, the other end of the first voltage-dividing resistor R1, and one end of the second voltage-dividing resistor R2, the other end of the parallel resistor R7 is connected to one end of the switch tube Q2, the other end of the switch tube Q2 is grounded, and the control unit 510 is connected to the controlled end of the switch tube Q2.

[0053] The control unit 510 controls the switch tube Q2 in the resistance adjustment circuit 521. When the switch tube Q2 is turned on, one end of the parallel resistor R7 is connected to one end of the second voltage-dividing resistor R2, and the other end of the parallel resistor R7 is equivalent to being grounded like the second voltage-dividing resistor R2, that is, the parallel resistor R7 and the second voltage-dividing resistor R2 are equivalent to being connected in parallel, so that the voltage-dividing resistance of the lower resistor of the voltage-dividing circuit is reduced, and the voltage value level of the segmented signal input to the controlled end of the boost module 200 will also decrease; when the switch tube Q2 is turned off, it can be considered that the second voltage-dividing resistor R2 is connected in parallel with a resistor with infinite resistance, that is, the second voltage-dividing resistor R2 has no parallel resistor R7, the voltage-dividing resistance of the lower resistor of the voltage-dividing circuit increases, and the voltage value level of the segmented signal increases. In this way, the control unit 510 generates a segmented signal by controlling the on and off of the switch tube Q2.

[0054] The switch tube Q2 may be implemented as a device with a switch function such as a MOS tube, an IGBT tube, etc.

[0055] It is understandable that by providing multiple groups of resistance adjustment circuits 521, the control unit 510 controls the number of parallel resistors R7 connected in parallel with the second voltage-dividing resistor R2 according to the magnitude of the input voltage, so that the segmented signal can correspond to multiple voltage value levels.

[0056] refer to Figure 2 and Figure 3 In some embodiments of a segmented secondary drive circuit of the present application, the resistance adjustment circuit 521 also includes a pull-down resistor R6, one end of the pull-down resistor R6 is respectively connected to the control unit 510 and the controlled end of the switch tube Q2, and the other end of the pull-down resistor R6 is grounded.

[0057] By providing the pull-down resistor R6, when the control unit 510 does not output a high level to drive the switch tube Q2 to turn on, the controlled end of the switch tube Q2 can maintain a low level state, thereby avoiding the switch tube Q2 from being mis-turned on, which is conducive to making the segmented signal more stable.

[0058] refer to Figure 2 and Figure 3 In some embodiments of a segmented two-level driving circuit of the present application, the resistance adjustment circuit 521 further includes a current limiting resistor R5, and the control unit 510 is connected to the controlled end of the switch tube Q2 through the current limiting resistor R5.

[0059] By providing the current limiting resistor R5, it is possible to prevent the control unit 510 from causing an excessive current to flow to the controlled end of the switch tube Q2, which is beneficial to reducing control loss and improving circuit reliability.

[0060] refer to Figure 2 and Figure 3In some embodiments of a segmented secondary drive circuit of the present application, the input voltage detection module 400 includes a filter capacitor C1, a third voltage-dividing resistor R3 and a fourth voltage-dividing resistor R4, one end of the filter capacitor C1 is respectively connected to the input end of the boost module 200 and one end of the third voltage-dividing resistor R3, the other end of the third voltage-dividing resistor R3 is respectively connected to the fourth voltage-dividing resistor R4 and the segmented adjustment feedback module 500, and the other end of the filter capacitor C1 and the other end of the fourth voltage-dividing resistor R4 are grounded.

[0061] The input voltage detection module 400 detects the input voltage of the boost module 200. Since the rectifier module 100 rectifies the AC power, it is usually a half-wave signal with voltage fluctuations. By providing a filter capacitor C1, the input voltage is filtered to form a more stable voltage, and then the input voltage is divided by a voltage divider circuit formed by a third voltage divider resistor R3 and a fourth voltage divider resistor R4 to convert the voltage value into a voltage range of a suitable size, forming a detection voltage that is transmitted to the control unit 510 in the segmented adjustment feedback module 500, thereby achieving the function of detecting the input voltage of the boost module 200. The circuit structure is simple and easy to implement.

[0062] refer to Figure 2 and Figure 3 In some embodiments of a segmented secondary drive circuit of the present application, the input voltage detection module 400 also includes a diode D1, the anode of the diode D1 is connected to the input end of the boost module 200, and the cathode of the diode D1 is respectively connected to one end of the filter capacitor C1 and one end of the third voltage-dividing resistor R3.

[0063] In order to prevent the electric energy stored in the filter capacitor C1 from being outputted in reverse to the boost module 200 , the diode D1 is used to limit the flow direction of the current, which is beneficial to protecting the boost module 200 and improving reliability.

[0064] The lighting device provided in the present application is described below. The lighting device described below and the segmented secondary driving circuit described above can be referenced to each other.

[0065] The present application also provides a lighting device, comprising: the above-mentioned segmented two-level driving circuit, and also comprising a lighting component, and the output end of the voltage regulating module 300 is connected to the lighting component.

[0066] The rectifier module 100 rectifies the city power and transmits it to the boost module 200. The boost module 200 boosts the input power and transmits it to the voltage regulating module 300. The voltage regulating module 300 adjusts the voltage to a range suitable for driving the lighting components, so that the lighting components can work normally and realize the lighting function. At the same time, the input voltage of the boost module 200 is detected by the input voltage detection module 400. The segmented adjustment feedback module 500 generates a corresponding segmented signal according to the range segment of the input voltage detected by the input voltage module. The voltage value level of the segmented signal is related to the voltage value range of the input voltage. The output voltage of the boost module 200 is determined according to the voltage value of the controlled end, that is, the voltage value level of the segmented signal corresponds to the output voltage level of the boost module 200. In this way, by using the range segment based on the input voltage of the boost module 200, the segmented regulation feedback module 500 generates a segmented signal of the corresponding voltage value level, so that the output voltage level of the boost module 200 corresponds to the segmented signal, thereby achieving the effect of segmented dynamic change of the output voltage level of the boost module 200. When the range segment to which the input voltage belongs is small, the output voltage level of the boost module 200 is low, which is beneficial to reducing the switching loss of the switching tube in the boost module 200 and the voltage regulation module 300, and improving the energy utilization efficiency.

[0067] In the description of the present application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present application, "plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0068] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0069] 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 deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A segmented two-stage drive circuit, characterized in that: include: A rectifier module, the input end of which is used to be connected to the mains; A boost module, the input end of the boost module is connected to the output end of the rectifier module; A voltage regulating module, wherein the input end of the voltage regulating module is connected to the output end of the boost module, and the output end of the voltage regulating module is used to be connected to a load; An input voltage detection module connected to the input end of the boost module; A segmented regulation feedback module, wherein the input end of the segmented regulation feedback module is connected to the input voltage detection module, the segmented regulation feedback module is connected to the controlled end of the boost module, and the segmented regulation feedback module is used to generate a segmented signal, and the segmented signal is used to control the output voltage level of the boost module; The segmented signal has at least two levels of voltage values, and the voltage value of the segmented signal corresponds to the range segment to which the input voltage detected by the input voltage detection module belongs.

2. A segmented two-level driving circuit according to claim 1, characterized in that: The segmented regulation feedback module includes a control unit, a parallel resistance adjustment unit and a voltage divider unit. The control unit is connected to the input voltage detection module and the parallel resistance adjustment unit respectively. The voltage divider unit is connected to the controlled end of the boost module. The parallel resistance adjustment unit is connected to the voltage divider unit. The parallel resistance adjustment unit is used to change the voltage divider resistance value of the voltage divider unit.

3. A segmented two-level driving circuit according to claim 2, characterized in that: The control unit includes a hysteresis comparison subunit, which is connected to the input voltage detection module. The hysteresis comparison subunit is provided with a voltage rise trigger threshold and a voltage drop trigger threshold, and the voltage rise trigger threshold is not equal to the voltage drop trigger threshold.

4. A segmented two-level driving circuit according to claim 2, characterized in that: The voltage dividing unit includes a first voltage dividing resistor and a second voltage dividing resistor, one end of the first voltage dividing resistor is connected to the output end of the boost module, the other end of the first voltage dividing resistor is respectively connected to the controlled end of the boost module, one end of the second voltage dividing resistor and the parallel resistance adjustment unit, and the other end of the second voltage dividing resistor is grounded.

5. A segmented two-level driving circuit according to claim 4, characterized in that: The parallel resistance adjustment unit includes at least one group of resistance adjustment circuits, which include a switch tube and a parallel resistor, one end of the parallel resistor is respectively connected to the controlled end of the boost module, the other end of the first voltage-dividing resistor and one end of the second voltage-dividing resistor, the other end of the parallel resistor is connected to one end of the switch tube, the other end of the switch tube is grounded, and the control unit is connected to the controlled end of the switch tube.

6. A segmented two-level driving circuit according to claim 5, characterized in that: The resistance adjustment circuit further includes a pull-down resistor, one end of which is connected to the control unit and the controlled end of the switch tube respectively, and the other end of which is grounded.

7. The segmented two-level driving circuit according to claim 5, characterized in that: The resistance adjustment circuit also includes a current limiting resistor, and the control unit is connected to the controlled end of the switch tube through the current limiting resistor.

8. The segmented two-level driving circuit according to claim 1, characterized in that: The input voltage detection module includes a filter capacitor, a third voltage-dividing resistor and a fourth voltage-dividing resistor. One end of the filter capacitor is respectively connected to the input end of the boost module and one end of the third voltage-dividing resistor, the other end of the third voltage-dividing resistor is respectively connected to the fourth voltage-dividing resistor and the segmented adjustment feedback module, and the other end of the filter capacitor and the other end of the fourth voltage-dividing resistor are grounded.

9. A segmented two-level driving circuit according to claim 8, characterized in that: The input voltage detection module further includes a diode, an anode of the diode is connected to the input end of the boost module, and a cathode of the diode is respectively connected to one end of the filter capacitor and one end of the third voltage-dividing resistor.

10. A lighting device, characterized in that: include: The segmented two-level driving circuit according to any one of claims 1 to 9 further comprises a lighting component, and the output end of the voltage regulating module is connected to the lighting component.

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