Segmented two-stage driving circuit and lighting apparatus

Abstract

The present application relates to the technical field of lighting driving circuits, and provides a segmented two-stage drive circuit and a lighting apparatus. The circuit comprises: a rectifying module, configured to be connected to a mains supply; a booster module, connected to an output end of the rectifying module; a voltage regulating module, connected to an output end of the booster module; an input voltage detection module, connected to an input end of the booster module; and a segmented regulation feedback module, connected to the input voltage detection module, the segmented regulation feedback module being connected to a controlled end of the booster module. The segmented regulation feedback module generates a segmented signal of a corresponding voltage value level on the basis of a range segment of an input voltage of the booster module, so that an output voltage level of the booster module corresponds to the segmented signal, to achieve the effect that the output voltage level of the booster module is dynamically changed in segments. When the input voltage is relatively small, the output voltage level of the booster module is low, so that the switch loss of a switch transistor in the booster module and the voltage regulating module can be reduced, and the electrical energy utilization efficiency can be improved.

Description

Segmented secondary driving circuit and lighting device

[0001] Cross-reference to Related Applications

[0002] This application claims priority to Chinese Patent Application No. 2024207122511, filed on April 8, 2024, entitled “A Segmented Secondary Driving Circuit and Lighting Device”, and Chinese Patent Application No. 2024104178134, filed on April 8, 2024, entitled “A Segmented Secondary Driving Circuit and Lighting Device”, which are incorporated by reference in their entirety. TECHNICAL FIELD

[0003] The present application relates to the technical field of lighting driving circuit, in particular to a segmented secondary driving circuit and lighting device. BACKGROUND

[0004] Due to the advantages of good lighting effect and high efficiency, LED lighting is widely used in various scenes. LED lighting devices usually include a driving circuit and a lighting element. In the driving circuit, a secondary topology architecture of a boost circuit and a voltage regulation circuit is widely used. The boost circuit in the front stage boosts the voltage, and the voltage regulation circuit in the rear stage adjusts the output voltage of the boost circuit to a voltage range suitable for the operation of the lighting element.

[0005] When the boost circuit is working normally, the output voltage cannot be too low, and there needs to be a minimum voltage difference between the input voltage and the output voltage, i.e., the output voltage of the boost circuit needs to exceed the minimum voltage difference threshold of the input voltage. In the conventional technology, considering the fluctuation of the power grid, the alternating current voltage provided by the power grid is 220V±20%, i.e., the maximum error of the alternating current fluctuation is 264V, and the peak voltage of 264V alternating current is 264×√2=373V. In addition to the minimum voltage difference threshold, the output voltage of the boost circuit is usually set to 400V to ensure that the boost circuit can work normally.

[0006] However, the switching loss of the switch tube increases as the voltage increases. In the case where the output voltage of the boost circuit is fixedly set to a high value, the switch tubes in the boost circuit and the voltage regulation circuit have high switching loss, which leads to an increase in power loss and is not conducive to improving the efficiency. SUMMARY

[0007] The present application provides a segmented secondary driving circuit and lighting device to solve the defects of high switching loss and low efficiency in the secondary driving circuit in the conventional technology.

[0008] The present application provides a segmented secondary driving circuit, comprising:

[0009] a rectifier module, an input end of the rectifier module being configured to be connected with commercial power;

[0010] a boost module, an input end of the boost module being connected with an output end of the rectifier module;

[0011] a voltage regulating module, an input end of the voltage regulating module being connected with an output end of the boost module, and an output end of the voltage regulating module being configured to be connected with a load;

[0012] an input voltage detection module, connected with the input end of the boost module;

[0013] a segmented regulation feedback module, an input end of the segmented regulation feedback module being connected with the input voltage detection module, the segmented regulation feedback module being connected with a controlled end of the boost module, and the segmented regulation feedback module being configured to generate a segmented signal, the segmented signal being configured to control an output voltage level of the boost module;

[0014] wherein the segmented signal has voltage values of at least two levels, and the voltage values of the segmented signal correspond to range segments of an input voltage detected by the input voltage detection module.

[0015] According to the segmented secondary driving circuit provided by the present application, the segmented regulation feedback module comprises a control unit, a parallel resistance adjusting unit and a voltage dividing unit, the control unit is connected with the input voltage detection module and the parallel resistance adjusting unit respectively, the voltage dividing unit is connected with the controlled end of the boost module, the parallel resistance adjusting unit is connected with the voltage dividing unit, and the parallel resistance adjusting unit is configured to change a voltage dividing resistance value of the voltage dividing unit.

[0016] According to the segmented secondary driving circuit provided by the present application, the control unit comprises a hysteresis comparison subunit, the hysteresis comparison subunit is connected with the input voltage detection module, the hysteresis comparison subunit is provided with a voltage rising trigger threshold value and a voltage falling trigger threshold value, and the voltage rising trigger threshold value is not equal to the voltage falling trigger threshold value.

[0017] According to the segmented secondary driving circuit provided by the present application, the voltage dividing unit comprises a first voltage dividing resistor and a second voltage dividing resistor, one end of the first voltage dividing resistor is connected with the output end of the boost module, the other end of the first voltage dividing resistor is connected with the controlled end of the boost module, one end of the second voltage dividing resistor and the parallel resistance adjusting unit respectively, and the other end of the second voltage dividing resistor is grounded.

[0018] According to the segmented secondary driving circuit provided in the application, the parallel resistance adjusting unit comprises at least one set of resistance adjusting circuit, the resistance adjusting circuit comprises a switch tube and a parallel resistance, one end of the parallel resistance is connected with the controlled end of the voltage boosting module, the other end of the first voltage dividing resistance and one end of the second voltage dividing resistance respectively, the other end of the parallel resistance is connected with one end of the switch tube, the other end of the switch tube is grounded, and the control unit is connected with the controlled end of the switch tube.

[0019] According to the segmented secondary driving circuit provided in the application, the resistance adjusting circuit further comprises a pull-down resistance, one end of the pull-down resistance is connected with the control unit and the controlled end of the switch tube respectively, and the other end of the pull-down resistance is grounded.

[0020] According to the segmented secondary driving circuit provided in the application, the resistance adjusting circuit further comprises a current limiting resistance, and the control unit is connected with the controlled end of the switch tube through the current limiting resistance.

[0021] According to the segmented secondary driving circuit provided in the application, the input voltage detection module comprises a filter capacitor, a third voltage dividing resistance and a fourth voltage dividing resistance, one end of the filter capacitor is connected with the input end of the voltage boosting module and one end of the third voltage dividing resistance respectively, the other end of the third voltage dividing resistance is connected with the fourth voltage dividing resistance and the segmented adjustment feedback module respectively, and the other end of the filter capacitor and the other end of the fourth voltage dividing resistance are grounded.

[0022] According to the segmented secondary driving circuit provided in the application, the input voltage detection module further comprises a diode, the anode of the diode is connected with the input end of the voltage boosting module, and the cathode of the diode is connected with one end of the filter capacitor and one end of the third voltage dividing resistance respectively.

[0023] The application further provides a lighting device, which comprises the above segmented secondary driving circuit and a lighting member, and the output end of the voltage adjusting module is connected with the lighting member.

[0024] The application provides a segmented two-stage driving circuit and a lighting device, and has at least the following beneficial effects: the rectifier module rectifies the commercial power and transmits the rectified commercial power to the voltage boosting module, the voltage boosting module boosts the input voltage and transmits the boosted voltage to the voltage regulating module, the voltage regulating module adjusts the voltage to a range suitable for driving the load, and the load such as the lighting piece is normally driven. Meanwhile, the input voltage detection module detects the input voltage of the voltage boosting module, the segmented adjusting feedback module generates a corresponding segmented signal according to the range of the input voltage detected by the input voltage detection module, the voltage level of the segmented signal is related to the voltage range of the input voltage, and the output voltage of the voltage boosting module is determined according to the voltage level of the controlled end, that is, the voltage level of the segmented signal corresponds to the output voltage level of the voltage boosting module. Therefore, the segmented adjusting feedback module generates a segmented signal with a corresponding voltage level based on the range of the input voltage of the voltage boosting module, so that the output voltage level of the voltage boosting module corresponds to the segmented signal, and the output voltage level of the voltage boosting module is segmented and dynamically changed. In the case that the range of the input voltage is small, the output voltage level of the voltage boosting module is low, which is beneficial to reducing the switching loss of the switch tube in the voltage boosting module and the voltage regulating module, and improving the power utilization efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0026] Fig. 1 is a structural block diagram of one of the embodiments of the segmented two-stage driving circuit provided by the application;

[0027] Fig. 2 is a circuit diagram of one of the embodiments of the segmented two-stage driving circuit provided by the application;

[0028] Fig. 3 is a circuit diagram of another embodiment of the segmented two-stage driving circuit provided by the application.

[0029] Reference signs: rectifier module 100; voltage boosting module 200; voltage regulating module 300; input voltage detection module 400; segmented adjusting feedback module 500; control unit 510; parallel resistance regulating unit 520; resistance regulating circuit 521; voltage dividing unit 530. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme of the present application will be described clearly and completely below in combination with the drawings in the present application. Obviously, the described embodiments are some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0031] The segmented secondary driving circuit of the present application will be described below in combination with Figures 1-3, which comprises:

[0032] a rectifier module 100, an input end of the rectifier module 100 being configured to be connected with commercial power;

[0033] a boost module 200, an input end of the boost module 200 being connected with an output end of the rectifier module 100;

[0034] a voltage regulation module 300, an input end of the voltage regulation module 300 being connected with an output end of the boost module 200, and an output end of the voltage regulation module 300 being configured to be connected with a load;

[0035] an input voltage detection module 400, connected with an input end of the boost module 200;

[0036] a segmented regulation feedback module 500, an input end of the segmented regulation feedback module 500 being connected with the input voltage detection module 400, the segmented regulation feedback module 500 being connected with a controlled end of the boost module 200, and the segmented regulation feedback module 500 being configured to generate a segmented signal, the segmented signal being configured to control an output voltage level of the boost module 200;

[0037] wherein the segmented signal has voltage values of at least two levels, 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.

[0038] The rectifier module 100 transmits the rectified commercial power to the boost module 200, the boost module 200 transmits the boosted input power to the voltage regulation module 300 after boosting processing, and the voltage regulation module 300 adjusts the voltage to a range suitable for driving the load, so as to realize the function of driving the load, such as lighting, to work normally. At the same time, the input voltage detection module 400 detects the input voltage of the boost module 200, the segmented regulation feedback module 500 generates the corresponding segmented signal according to the range segment to which the input voltage detected by the input voltage module belongs, the voltage level of the segmented signal is related to the voltage value range in which the input voltage is located, and the output voltage of the boost module 200 is determined according to the voltage value of the controlled end, i.e. the voltage level of the segmented signal corresponds to the output voltage level of the boost module 200.

[0039] In this way, by segmenting the range based on the input voltage of the boost module 200, the segmented signal corresponding to the voltage level is generated by the segmented feedback module 500, so that the boost module 200 outputs a voltage level corresponding to the segmented signal, and the output voltage level of the boost module 200 is dynamically segmented, and in the case that the input voltage belongs to a smaller range, the output voltage level of the boost module 200 is low, which is beneficial to reduce the switching loss of the switch tube in the boost module 200 and the voltage regulating module 300, and improve the efficiency of the use of electric energy.

[0040] In order to facilitate 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 in the range segment below 240V, the voltage value of the segmented signal is the first level, such as 5V, which corresponds to the output voltage level of the boost module 200 being 350V; when the input voltage of the boost module 200 is in the range segment above 240V, the voltage value of the segmented signal is the second level, such as 10V, which corresponds to the output voltage level of the boost module 200 being 400V. In this way, the output voltage of the boost module 200 can be dynamically segmented. The above is only an example for illustration, and in actual application, the segmented signal can include more voltage value levels, and correspondingly, the output voltage level of the boost module 200 can also be more.

[0041] In some embodiments of the present application, the boost module 200 can be an embodiment including a Boost circuit or a power factor correction PFC circuit with a boost function, and a single-chip microcomputer, a PFC control chip and the like; the voltage regulating module 300 can be an embodiment including an isolated flyback voltage regulating circuit, a non-isolated flyback voltage regulating circuit or a buck voltage regulating circuit, and the like, to realize the function of regulating the output voltage of the boost module 200, so as to meet the demand of the rated working voltage of the lighting device.

[0042] It can be understood that the boost module 200 and the voltage regulating module 300 include a switch tube, as shown in FIGS. 2 and 3, the boost module 200 includes a switch tube Q1; the switch tube can also be integrated in a chip, as shown in FIG. 2, and 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 selected as a chip with a model number of BP3337D, which has a switch tube integrated inside.

[0043] Referring to FIG. 2 and FIG. 3, in some embodiments of the segmented secondary driving circuit, the segmented regulation feedback module 500 comprises a control unit 510, a parallel resistance adjusting unit 520, and a voltage dividing unit 530, the control unit 510 is connected with the input voltage detection module 400 and the parallel resistance adjusting unit 520 respectively, the voltage dividing unit 530 is connected with the controlled end of the voltage boosting module 200, the parallel resistance adjusting unit 520 is connected with the voltage dividing unit 530, and the parallel resistance adjusting unit 520 is configured to change the voltage dividing resistance of the voltage dividing unit 530.

[0044] The control unit 510 controls the parallel resistance adjusting unit 520 to change the voltage dividing resistance according to the input voltage detected by the input voltage detection module 400, and the voltage input to the controlled end of the voltage boosting module 200 by the voltage dividing unit 530 will also change due to the change of the voltage dividing resistance, thereby realizing the segmented signal with voltage levels. In this way, the voltage formed by the voltage dividing unit 530 changes in the form of levels by changing the resistance in parallel, that is, the segmented signal is generated, and the voltage levels of the segmented signal are stable and reliable due to the stable and reliable change of the voltage dividing resistance caused by parallel connection.

[0045] For the case that the segmented signal has multiple voltage levels, the parallel resistance adjusting unit 520 can be connected with a corresponding number of resistors, for example, one resistor for the first level and two resistors for the second level, so that the voltage dividing resistance corresponds to the voltage levels of the segmented signal.

[0046] In some embodiments of the segmented secondary driving circuit, the control unit 510 comprises a hysteresis comparison subunit, which is connected with the input voltage detection module 400, and 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.

[0047] In consideration of the fluctuation of the input voltage, in order to avoid the input voltage fluctuating between the two range interval values, causing the control unit 510 to frequently control the parallel resistance adjusting unit 520 to act. By including a hysteresis comparison subunit in the control unit 510, when the input voltage detected by the input voltage detection module 400 rises more than the voltage rise trigger threshold, the hysteresis comparison subunit causes the control unit 510 to control the parallel resistance adjusting unit 520 to change the voltage division resistance value, and when the input voltage drops, it needs to be less than the voltage drop trigger threshold, the hysteresis comparison subunit will cause the control unit 510 to control the parallel resistance adjusting unit 520 to cancel the change of the voltage division resistance value. In this way, the control of the parallel resistance adjusting unit 520 is action and cancellation action corresponding to the voltage rise trigger value, the voltage drop trigger value, that is, the voltage value corresponding to the action and cancellation action is different, and 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 adjusting unit 520 to act or cancel the action, so as to avoid the frequent action of the parallel resistance adjusting unit 520 caused by the voltage fluctuation.

[0048] It can be understood that for the case of more than two voltage value levels of the segmented signal, the hysteresis comparison subunit needs to correspond to the voltage value level, that is, for each voltage value level of the segmented signal, a corresponding voltage rise trigger threshold and a voltage drop trigger threshold need to be set, so that for each voltage value level, the voltage will not frequently jump due to voltage fluctuation.

[0049] The control unit 510 can be an embodiment including a single-chip microcomputer, an embedded chip and the like. The hysteresis comparison subunit in the control unit 510 can be an embodiment of a Schmitt trigger and the like. In the process of rising of the input voltage, the Schmitt trigger outputs a high level when the voltage is greater than the voltage rise trigger threshold, and in the process of falling of the input voltage, the Schmitt trigger outputs a low level when the voltage is less than the voltage drop trigger threshold. In this way, as long as the fluctuation amplitude of the input voltage is less than the difference between the voltage rise trigger threshold and the voltage drop trigger threshold, the output level of the Schmitt trigger will not change, and the control unit 510 can be avoided from frequently controlling the parallel resistance adjusting unit 520 to act due to the fluctuation of the input voltage.

[0050] In some embodiments, when the control unit 510 includes a single-chip microcomputer, an embedded chip and the like having processing function, the hysteresis comparison subunit can also have a function program in the processing function device to realize the same function as the Schmitt trigger.

[0051] Referring to FIG. 2 and FIG. 3, in some embodiments of the segmented secondary driving circuit, the voltage dividing unit 530 comprises a first voltage dividing resistor R1 and a second voltage dividing resistor R2, one end of the first voltage dividing resistor R1 is connected with the output end of the voltage boosting module 200, the other end of the first voltage dividing resistor R1 is connected with the controlled end of the voltage boosting module 200, one end of the second voltage dividing resistor R2 and the parallel resistance adjusting unit 520 respectively, and the other end of the second voltage dividing resistor R2 is grounded.

[0052] One end of the first voltage dividing resistor R1 is connected with the output end of the voltage boosting module 200 as a voltage source for voltage division, the first voltage dividing resistor R1 and the second voltage dividing resistor R2 form a voltage dividing circuit to divide the voltage of the output end of the voltage boosting module 200 to form a segmented signal input to the controlled end of the voltage boosting module 200, and the control unit 510 changes the resistance value of the voltage dividing circuit by controlling the parallel connection of the parallel resistance adjusting unit 520 and the second voltage dividing resistor R2, so as to change the voltage level of the segmented signal.

[0053] Referring to FIG. 2 and FIG. 3, in some embodiments of the segmented secondary driving circuit, the parallel resistance adjusting unit 520 comprises at least one set of resistance adjusting circuit 521, the resistance adjusting circuit 521 comprises a switch tube Q2 and a parallel resistor R7, one end of the parallel resistor R7 is connected with the controlled end of the voltage boosting module 200, the other end of the first voltage dividing resistor R1 and one end of the second voltage dividing resistor R2 respectively, the other end of the parallel resistor R7 is connected with one end of the switch tube Q2, the other end of the switch tube Q2 is grounded, and the control unit 510 is connected with the controlled end of the switch tube Q2.

[0054] The control unit 510 controls the switch tube Q2 in the resistance adjusting circuit 521, when the switch tube Q2 is turned on, one end of the parallel resistor R7 is connected with one end of the second voltage dividing resistor R2, and the other end of the parallel resistor R7 is equivalent to being grounded with 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 resistance value of the lower resistor of the voltage dividing circuit is reduced, and the voltage level of the segmented signal input to the controlled end of the voltage boosting module 200 is also reduced; when the switch tube Q2 is cut 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 resistance value of the lower resistor of the voltage dividing circuit is increased, and the voltage level of the segmented signal is increased. In this way, the control unit 510 controls the turn-on and cut-off of the switch tube Q2 to generate the segmented signal.

[0055] The switch tube Q2 can be an embodiment of a MOS tube, an IGBT tube or other switching function device.

[0056] It can be understood that by setting multiple groups of resistance adjusting circuits 521, the control unit 510 controls the number of parallel resistors R7 in parallel with the second voltage dividing resistor R2 according to the size of the input voltage, so that the segmented signal corresponds to multiple voltage value levels.

[0057] Referring to FIGS. 2 and 3, in some embodiments of the segmented secondary driving circuit of the present application, the resistance adjusting circuit 521 further comprises a pull-down resistor R6, one end of the pull-down resistor R6 is connected to the control unit 510 and the controlled end of the switch tube Q2 respectively, and the other end of the pull-down resistor R6 is grounded.

[0058] By setting 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 remains at a low level, avoiding the case of the switch tube Q2 being mistakenly turned on, which is conducive to making the segmented signal more stable.

[0059] Referring to FIGS. 2 and 3, in some embodiments of the segmented secondary driving circuit of the present application, the resistance adjusting circuit 521 further comprises 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.

[0060] By setting the current limiting resistor R5, it can prevent the current flowing from the control unit 510 to the controlled end of the switch tube Q2 from being too large, which is conducive to reducing control loss and improving the reliability of the circuit.

[0061] Referring to FIGS. 2 and 3, in some embodiments of the segmented secondary driving circuit of the present application, the input voltage detection module 400 comprises 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 connected to the input end of the voltage boosting module 200 and one end of the third voltage dividing resistor R3 respectively, the other end of the third voltage dividing resistor R3 is connected to the fourth voltage dividing resistor R4 and the segmented adjustment feedback module 500 respectively, and the other end of the filter capacitor C1 and the other end of the fourth voltage dividing resistor R4 are grounded.

[0062] The input voltage detection module 400 detects the input voltage of the voltage boosting module 200. Since the rectifier module 100 rectifies the mains voltage, it is usually a half-wave signal with voltage fluctuation. By setting the filter capacitor C1, the input voltage is filtered to form a more stable voltage, and then the third voltage dividing resistor R3 and the fourth voltage dividing resistor R4 form a voltage dividing circuit to divide the input voltage, so as to convert the voltage value to a suitable size voltage range, and form a detection voltage transmitted to the control unit 510 in the segmented adjustment feedback module 500, so as to achieve the function of detecting the input voltage of the voltage boosting module 200, and the circuit structure is simple and easy to implement.

[0063] Referring to FIG. 2 and FIG. 3, in some embodiments of the segmented secondary driving circuit provided in the present application, the input voltage detection module 400 further comprises a diode D1, an anode of the diode D1 is connected with an input end of the voltage boosting module 200, and a cathode of the diode D1 is connected with one end of the filter capacitor C1 and one end of the third voltage dividing resistor R3 respectively.

[0064] In order to avoid the stored energy of the filter capacitor C1 being output reversely to the voltage boosting module 200, the current flow direction is limited by the diode D1, which is beneficial to protect the voltage boosting module 200 and improve the reliability.

[0065] The lighting device provided in the present application is described below, and the lighting device described below can be correspondingly referred to the segmented secondary driving circuit described above.

[0066] The present application further provides a lighting device, comprising the segmented secondary driving circuit described above, and further comprising a lighting element, wherein an output end of the voltage regulating module 300 is connected with the lighting element.

[0067] The rectifier module 100 rectifies the commercial power and transmits the rectified commercial power to the voltage boosting module 200, the voltage boosting module 200 boosts the input voltage and transmits the boosted voltage to the voltage regulating module 300, the voltage regulating module 300 adjusts the voltage to a range suitable for driving the lighting element, so that the lighting element can work normally and realize the lighting function. Meanwhile, the input voltage detection module 400 detects the input voltage of the voltage boosting module 200, 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 detection module, the voltage level of the segmented signal is related to the voltage range where the input voltage is located, and the output voltage of the voltage boosting module 200 is determined according to the voltage level of the controlled end, i.e. the voltage level of the segmented signal corresponds to the output voltage level of the voltage boosting module 200. In this way, the segmented adjustment feedback module 500 generates the segmented signal with the corresponding voltage level based on the range segment of the input voltage of the voltage boosting module 200, so that the output voltage level of the voltage boosting module 200 corresponds to the segmented signal, achieving the effect that the output voltage level of the voltage boosting module 200 dynamically changes in segments. In the case that the range segment of the input voltage is small, the output voltage level of the voltage boosting module 200 is low, which is beneficial to reduce the switching loss of the switching tubes in the voltage boosting module 200 and the voltage regulating module 300, and improve the energy utilization efficiency.

[0068] In the description of the present application, it should be understood that the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0069] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, different embodiments or examples described in the present specification and the features of different embodiments or examples can be combined and combined by those skilled in the art without contradiction.

[0070] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A segmented secondary drive circuit, comprising: A rectifier module, wherein an input end of the rectifier module is configured to be connected to the mains; A boost module, wherein the input end of the boost module is connected to the output end of the rectifier module; a voltage regulating module, wherein an input end of the voltage regulating module is connected to an output end of the boost module, and an output end of the voltage regulating module is configured 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 an input end of the segmented regulation feedback module is connected to the input voltage detection module, the segmented regulation feedback module is connected to a controlled end of the boost module, and the segmented regulation feedback module is configured to generate a segmented signal, and the segmented signal is configured to control the output voltage level of the boost module; The segmented signal has at least two levels of voltage values, and the voltage values ​​of the segmented signal correspond to the range of the input voltage detected by the input voltage detection module.

2. A segmented two-stage drive circuit according to claim 1, wherein: 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 configured to change the voltage divider resistance value of the voltage divider unit.

3. A segmented two-stage drive circuit according to claim 2, wherein: 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 rising trigger threshold and a voltage falling trigger threshold, and the voltage rising trigger threshold is not equal to the voltage falling trigger threshold.

4. A segmented two-stage drive circuit according to claim 2, wherein: 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-stage driving circuit according to claim 4, wherein: The parallel resistance adjustment unit includes at least one group of resistance adjustment circuits, which include a switching 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 switching tube. The other end of the switching tube is grounded. The control unit is connected to the controlled end of the switching tube.

6. A segmented two-stage driving circuit according to claim 5, wherein: 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. A segmented two-stage driving circuit according to claim 5, wherein: The resistance adjustment circuit further includes a current limiting resistor, and the control unit is connected to the controlled end of the switch tube via the current limiting resistor.

8. The segmented two-stage driving circuit according to claim 1, wherein: 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, wherein: 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. Lighting devices, including: 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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