Voltage regulation circuit

Abstract

The present application discloses a voltage regulation circuit, comprising a reference voltage adjustment module, a comparison element, and a supply voltage adjustment module. The reference voltage adjustment module has a first end connected to an adjustment control element, and a second end connected to the comparison element; the reference voltage adjustment module adjusts a target reference voltage on the basis of a control signal sent by the adjustment control element, and outputs the adjusted reference voltage by means of the second end; the comparison element has a first input end connected to a supply voltage of a target element, a second input end connected to the adjusted reference voltage, and an output end connected to the supply voltage adjustment module; the comparison element outputs a comparison result by means of the output end; and the supply voltage adjustment module adjusts the supply voltage on the basis of the comparison result.

Description

voltage regulator circuit

[0001] Cross-references

[0002] This application claims priority to the Chinese patent application filed with the China Patent Office on February 26, 2024, with application number 202410211697.0 and application name “Voltage Regulating Circuit”. The entire contents of the application are incorporated by reference into this application. Technical Field

[0003] The present application relates to the field of electronic technology, and in particular to a voltage regulating circuit. Background Art

[0004] For systems using constant voltage, linear constant current regulation, the supply voltage provided to the light source module is a preset constant voltage and is not adjustable. A light source module consists of multiple light-emitting elements connected in series. Due to different batches of light-emitting elements, the voltage specifications of these light-emitting elements may vary. This difference in light-emitting element voltage specifications results in a certain range of voltage drops across the light source module.

[0005] A constant supply voltage may cause a large voltage drop on the linear constant current regulation circuit used for the light source module. The ineffective voltage drop leads to a large power loss in the linear constant current regulation circuit, low overall system efficiency, and low luminous efficiency of the light source module. Summary of the Invention

[0006] The purpose of the embodiments of the present application is to provide a voltage regulating circuit.

[0007] In a first aspect, a voltage regulation circuit is provided, comprising a reference voltage adjustment module, a comparison element, and a supply voltage adjustment module, wherein the reference voltage adjustment module has a first end connected to an adjustment control element and a second end connected to the comparison element, and the reference voltage adjustment module adjusts a target reference voltage based on a control signal sent by the adjustment control element, and outputs the adjusted reference voltage through the second end; the comparison element has a first input end connected to the supply voltage of the target element, a second input end connected to the adjusted reference voltage, and an output end connected to the supply voltage adjustment module, and the comparison element outputs a comparison result through the output end; and the supply voltage adjustment module adjusts the supply voltage based on the comparison result.

[0008] Optionally, the reference voltage adjustment module includes a switch unit and a resistor unit, the switch unit having a first end connected to the adjustment control element and a second end connected to the resistor unit, and the switch unit is turned on or off based on a control signal sent by the adjustment control element; the resistor unit having a first end connected to the switch unit, a second end connected to the target reference voltage, and a third end connected to the second input end of the comparison element, and the resistor unit forms a corresponding resistance when the switch unit is turned on and off to determine the adjusted reference voltage connected to the second input end of the comparison element.

[0009] Optionally, the resistance unit includes a first resistor, a second resistor and a third resistor, the first end of the first resistor is connected to the target reference voltage, the second end of the first resistor is respectively connected to the first end of the second resistor, the first end of the third resistor, and the second input end of the comparison element; the second end of the second resistor is grounded; and the second end of the third resistor is connected to the second end of the switch unit.

[0010] Optionally, the switch unit includes a MOS transistor, a gate of the MOS transistor is connected to the adjustment control element, a drain of the MOS transistor is connected to the second end of the third resistor, and a source of the MOS transistor is grounded.

[0011] Optionally, the control signal is a PWM pulse signal, and the adjusted reference voltage is determined by the period and duty cycle of the PWM pulse signal, and a resistance structure formed when the PWM pulse signal controls the switch unit to be turned on and off.

[0012] Optionally, when the PWM pulse signal controls the switch unit to be turned off, the third resistor is disconnected, and the voltage at the second end of the first resistor is When the PWM pulse signal controls the switch unit to be turned on, the second resistor and the third resistor are connected in parallel, and the voltage at the second end of the first resistor is The adjusted reference voltage Wherein, Vref represents the target reference voltage, R4 represents the first resistor, R7 represents the second resistor, R6 represents the third resistor, R0 is the parallel resistance of the second resistor and the third resistor, T represents the period of the PWM pulse signal, and D represents the duty cycle of the PWM pulse signal.

[0013] Optionally, the reference voltage adjustment module further includes: a filtering unit connected between the third terminal of the resistance unit and the second input terminal of the comparison element, and configured to filter the adjusted reference voltage output by the resistance unit.

[0014] Optionally, the filtering unit includes: a fourth resistor, a first end of which is connected to the second end of the first resistor, and a second end of which is connected to the second input end of the comparison element; a first capacitor, a first end of which is connected to the second end of the fourth resistor, and a second end of which is grounded; and a second capacitor, a first end of which is connected to the first end of the fourth resistor, and a second end of which is grounded.

[0015] Optionally, the supply voltage adjustment module includes an optocoupler element, a voltage control unit and a voltage adjustment unit, wherein the optocoupler element has a first end connected to the output end of the comparison element and a second end connected to the voltage control unit, and the optocoupler element is turned on or off based on the comparison result output by the comparison element to transmit the comparison result to the voltage control unit; the voltage control unit is connected to the voltage adjustment unit and is used to send a control signal to the voltage adjustment unit based on the comparison result; and the voltage adjustment unit adjusts the supply voltage based on the control signal.

[0016] Optionally, the target element comprises an LED light source having a plurality of LEDs connected in series. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0018] FIG1 is a structural block diagram of a voltage regulating circuit according to an embodiment of the present application.

[0019] FIG2 is a structural block diagram of a constant voltage linear constant current regulation system according to an embodiment of the present application.

[0020] FIG3 is a circuit diagram of a constant voltage linear constant current regulation system according to an embodiment of the present application. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. The figure numbers in this application are only used to distinguish the various steps in the scheme and are not used to limit the execution order of the various steps. The specific execution order is subject to the description in the specification.

[0022] In order to solve the problems existing in the related art, an embodiment of the present application provides a voltage regulating circuit. As shown in Figure 1, the voltage regulating circuit 160 includes a reference voltage adjustment module 1620, a comparison element 1640 and a supply voltage adjustment module 1660. The reference voltage adjustment module 1620 has a first end connected to the adjustment control element and a second end connected to the comparison element 1640. The reference voltage adjustment module 1620 adjusts the target reference voltage based on the control signal sent by the adjustment control element and outputs the adjusted reference voltage through the second end; the comparison element 1640 has a first input end connected to the supply voltage of the target element, a second input end connected to the adjusted reference voltage, and an output end connected to the supply voltage adjustment module 1660. The comparison element 1640 outputs a comparison result through the output end; the supply voltage adjustment module 1660 adjusts the supply voltage based on the comparison result.

[0023] 2 , the voltage regulating circuit 160 is applied to a constant voltage linear constant current regulating system 100 , which is a system for regulating a target element 110 using a constant voltage linear constant current. The power supply voltage provided to the target element 110 is a preset constant voltage.

[0024] As shown in FIG2 , the constant-voltage linear constant-current regulation system 100 includes a linear constant-current regulation circuit 120, an adjustment control element 140, and a voltage regulating circuit 160. The linear constant-current regulation circuit 120 has a first end connected to the target element 110 and a second end connected to the adjustment control element 140. The linear constant-current regulation circuit 120 feeds back its own voltage drop to the adjustment control element 140. The adjustment control element 140 has a first end connected to the linear constant-current regulation circuit 120 and a second end connected to the voltage regulating circuit 160. The adjustment control element 140 sends a control signal to the voltage regulating circuit 160 based on the voltage drop. The voltage regulating circuit 160 is connected to the adjustment control element 140. The voltage regulating circuit 160 adjusts the preset constant voltage supplied to the target element 110 based on the control signal.

[0025] The target element 110 can be any type of light source module, and the linear constant current adjustment circuit 120 dims the light source module based on the linear constant current. The target element 110 is connected to a preset constant voltage, which serves as a power supply voltage to power the target element 110.

[0026] The voltage input terminal of the linear constant current regulation circuit 120 is connected to the target element 110 . The regulation control element 140 adjusts the supply voltage of the target element 120 based on the voltage drop to adjust the voltage at the voltage input terminal of the linear constant current regulation circuit 120 .

[0027] The voltage at the voltage input end of the linear constant current adjustment circuit 120 is the difference between the power supply voltage and the voltage of the target element, and the voltage drop across the linear constant current adjustment circuit 120 is the difference between the voltage at the voltage input end of the linear constant current adjustment circuit 120 and the voltage at the voltage output end of the linear constant current adjustment circuit 120.

[0028] The voltage at the voltage input terminal of the linear constant current regulation circuit 120 is the voltage obtained by dividing the preset constant supply voltage by the target device 110. For example, if the supply voltage is V0 and the voltage of the target device 110 is V1, the voltage at the voltage input terminal of the linear constant current regulation circuit 120 is (V0-V1). The voltage at the voltage output terminal of the linear constant current regulation circuit 120 is typically a preset value, such as V2. The voltage drop across the linear constant current regulation circuit 120 is ΔV = (V0-V1)-V2.

[0029] If the target element 110 corresponds to light source modules from different batches and with different voltage specifications, the voltage V1 of the target element 110 may vary, resulting in a certain range of voltage V1. Since the target element 110's supply voltage V0 is constant, variations in voltage V1 cause variations in the voltage drop ΔV across the linear constant current regulation circuit 120. A particularly large voltage drop ΔV across the linear constant current regulation circuit results in greater losses in the linear constant current regulation circuit, reducing the overall efficiency of the constant voltage linear constant current regulation system.

[0030] For example, the voltage specification range of a single target light-emitting diode (LED) is 2.9V-3.3V. This means a single LED might have a voltage specification of 2.9V-3.0V, 3.0V-3.1V, 3.1V-3.2V, or 3.2V-3.3V. The voltage drop of this type of LED has a certain range, with the difference between the highest and lowest voltages being 0.4V. If 10 LEDs of this type are connected in series, the maximum voltage difference reaches 4V.

[0031] Assuming the linear constant current regulator circuit provides a constant current of 360mA and a normal operating voltage drop of 0.9V, for a light source module consisting of 10 LEDs of this type connected in series, the voltage required to achieve the lowest parallel voltage is 2.9*10+0.9=29.9V, and the voltage required to achieve the highest parallel voltage is 3.3*10+0.9=33.9V. If the supply voltage provided to this light source module is 35V, when the lowest parallel voltage is used, the ineffective voltage drop across the linear constant current regulator circuit is 35-29.9=5.1V, resulting in a power loss of P=V*I=5.1*0.36=1.836W. Such losses are unavoidable in the linear constant current regulator circuit and can only be dissipated as heat.

[0032] Therefore, in the embodiment of the present application, the voltage drop module 1220 determines the voltage drop ΔV on the linear constant current adjustment circuit 120 by obtaining the voltage at the voltage input end and the voltage at the voltage output end of the linear constant current adjustment circuit 120, and the feedback module 1240 feeds back the voltage drop to the adjustment control element 140.

[0033] Optionally, the voltage input terminal of the linear constant current adjustment circuit 120 is connected to the target element 110 , and the adjustment control element 140 adjusts the supply voltage of the target element 110 based on the voltage drop to adjust the voltage of the voltage input terminal of the linear constant current adjustment circuit 120 .

[0034] The adjustment control element 140 further adjusts the preset constant supply voltage V0 provided to the target element 110 to reduce the loss caused by a large voltage drop ΔV across the linear constant current adjustment circuit 120 .

[0035] In an exemplary embodiment, the adjustment control element 140 can be used to: if the voltage drop is greater than the operating voltage drop of the linear constant current adjustment circuit 120, send a control signal to the voltage regulation circuit 160 to adjust the preset constant voltage V0 to decrease; if the voltage drop is less than the operating voltage drop of the linear constant current adjustment circuit 120, send a control signal to the voltage regulation circuit 160 to adjust the preset constant voltage to increase.

[0036] When the adjustment control unit 140 receives the voltage drop from the linear constant current dimming circuit 120, it compares it with a preset voltage drop threshold to determine whether the supply voltage V0 needs to be adjusted. If adjustment is required, it sends a control signal corresponding to the duty cycle to set the required adjusted supply voltage, and combines with the voltage regulation circuit 160 to achieve voltage adjustment. The adjustment control unit 140 can be implemented by a single-chip microcomputer.

[0037] The linear constant current regulation circuit 120 operates based on the principle of linear constant current. The linear constant current regulation circuit 120 itself has an operating voltage drop ΔV1 required for normal operation. The voltage drop ΔV of the linear constant current regulation circuit 120, determined by the voltage drop module 1220 based on the voltage input and voltage output of the linear constant current regulation circuit 120, may be greater than or less than the operating voltage drop ΔV1 required for normal operation. For example, if the voltage V1 of the target components 110 of the corresponding batch is within a relatively low voltage range, resulting in a relatively large voltage drop ΔV of the linear constant current regulation circuit 120, the voltage drop ΔV may be greater than the operating voltage drop ΔV1. If the voltage V1 of the target components 110 of the corresponding batch is within a relatively high voltage range, resulting in a relatively small voltage drop ΔV of the linear constant current regulation circuit 120, the voltage drop ΔV may be less than the operating voltage drop ΔV1.

[0038] If the voltage drop ΔV of the linear constant current regulation circuit 120 is greater than the operating voltage drop ΔV1, this will result in significant losses in the linear constant current regulation circuit 120. In this case, the adjustment control element 140 needs to lower the preset constant voltage connected to the target element 110, and thus sends a control signal to the voltage regulation circuit 160 to adjust the preset constant voltage. Thus, by supplying power to the target element 110 based on the reduced constant voltage, the voltage drop ΔV across the linear constant current regulation circuit 120 can be reduced, thereby reducing losses in the linear constant current regulation circuit 120 and improving the overall efficiency of the constant-voltage linear constant current regulation system.

[0039] If the voltage drop ΔV of the linear constant current regulation circuit 120 is less than the operating voltage drop ΔV1, the linear constant current regulation circuit 120 will not function properly. In this case, the adjustment control element 140 needs to increase the preset constant voltage connected to the target element 110, and sends a control signal to the voltage regulation circuit 160 to increase the preset constant voltage. As a result, the target element 110 is powered based on the increased constant voltage, which can increase the voltage drop ΔV across the linear constant current regulation circuit 120 to the operating voltage drop, thereby enabling the linear constant current regulation circuit 120 to function properly.

[0040] The supply voltage of the target element 110 is typically adjusted only once. After the target element 110 reaches the appropriate supply voltage, the supply voltage is subsequently maintained constant, and power is supplied to the target element at a constant level. Thus, supplying power to the target element at the adjusted constant voltage allows the linear constant current regulation circuit 120 to operate normally with minimal losses, significantly improving the overall efficiency of the constant voltage, linear constant current regulation system.

[0041] Optionally, the control signal is a pulse width modulation (PWM) pulse signal, and the voltage regulation circuit adjusts the preset constant voltage V0 based on the PWM pulse signal. The adjustment control element 140 can determine an adjusted supply voltage for constant voltage power supply to the target element 110 based on the voltage drop ΔV of the linear constant current adjustment circuit 120, thereby determining a PWM pulse signal corresponding to the duty cycle, and the voltage regulation circuit performs voltage adjustment.

[0042] The voltage regulating circuit 160 adjusts the magnitude of the preset constant voltage supplied to the target component 110 based on the PWM pulse signal sent by the adjustment control component 140 .

[0043] In one embodiment, the voltage regulating circuit 160 may be implemented as a switch resistor circuit, and the preset constant voltage supplied to the target element 110 is adjusted by adjusting the resistance value based on the duty cycle of the PWM pulse signal.

[0044] 3 , in an exemplary embodiment, a reference voltage adjustment module 1620 of the voltage regulation circuit 160 has a first terminal connected to the adjustment control element 140 and a second terminal connected to the comparison element U1A. Reference voltage adjustment module 1620 adjusts the target reference voltage Vref based on a control signal sent by the adjustment control element 140 and outputs the adjusted reference voltage through a second terminal. Comparison element U1A has a first input terminal 2 connected to the supply voltage V0 of the target element 110, a second input terminal 3 connected to the adjusted reference voltage, and an output terminal 1 connected to the supply voltage adjustment module. Comparison element U1A outputs a comparison result through output terminal 1, and the supply voltage adjustment module adjusts the supply voltage V0 based on the comparison result.

[0045] In the embodiment of Figure 3 , comparison element U1A is a comparator. The first input terminal 2 of the comparator is the negative input terminal (IN-), the second input terminal 3 of the comparator is the positive input terminal (IN+), and the output terminal 3 corresponds to the comparator's OUT1. The voltage connected to the first input terminal 2 is the supply voltage V0 divided by resistors R1 and R2. The supply voltage V0 provided to the target component 110 is collected in real time and compared with the adjusted reference voltage connected to the second input terminal 3, allowing the supply voltage adjustment module to adjust the supply voltage V0.

[0046] Optionally, the reference voltage adjustment module includes a switch unit and a resistor unit, the switch unit having a first end connected to the adjustment control element and a second end connected to the resistor unit, and the switch unit is turned on or off based on a control signal sent by the adjustment control element; the resistor unit having a first end connected to the switch unit, a second end connected to the target reference voltage, and a third end connected to the second input end of the comparison element, and the resistor unit forms a corresponding resistance when the switch unit is turned on and off to determine the adjusted reference voltage connected to the second input end of the comparison element.

[0047] In one embodiment, in combination with Figure 3, the resistance unit includes a first resistor R4, a second resistor R7 and a third resistor R6, the first end of the first resistor R4 is connected to the target reference voltage Vref, the second end of the first resistor R4 is respectively connected to the first end of the second resistor R7, the first end of the third resistor R6, and the second input end 3 of the comparison element U1A; the second end of the second resistor R7 is grounded; and the second end of the third resistor R6 is connected to the second end of the switch unit.

[0048] In one embodiment, the switch unit includes a MOS transistor, a gate of the MOS transistor is connected to the adjustment control element, a drain of the MOS transistor is connected to the second end of the third resistor R6, and a source of the MOS transistor is grounded.

[0049] 3 , the gate of the MOS transistor Q1 is connected to a terminal of the adjustment control element 140 outputting the PWM pulse signal PWM_Vset, the drain of the MOS transistor Q1 is connected to the second terminal of the third resistor R6 , and the source of the MOS transistor is grounded to SGND.

[0050] The control signal of the adjustment control element 140 is a PWM pulse signal, and the adjusted reference voltage is determined by the period and duty cycle of the PWM pulse signal and the resistance structure formed when the PWM pulse signal controls the switch unit to be turned on and off.

[0051] In an exemplary embodiment, when the PWM pulse signal controls the switch unit to be turned off, the third resistor R6 is disconnected, and the voltage at the second end of the first resistor R4 is When the PWM pulse signal controls the switch unit to be turned on, the second resistor R7 and the third resistor R6 are connected in parallel, and the voltage at the second end of the first resistor R4 is The adjusted reference voltage Wherein, Vref represents the target reference voltage, R4 represents the first resistor, R7 represents the second resistor, R6 represents the third resistor, R0 is the parallel resistance of the second resistor and the third resistor, T represents the period of the PWM pulse signal, and D represents the duty cycle of the PWM pulse signal.

[0052] The adjustment control element 140 emits a PWM pulse signal including a high level and a low level according to a certain duty cycle within a period T, thereby correspondingly turning on and off the switch unit within a period T, so that the resistance unit forms a corresponding resistance structure when it is turned on and off, respectively, and obtains the voltage after adjusting the target reference voltage Vref within each period T, and outputs it to the second input terminal 3 of the comparison element.

[0053] In order to stabilize the adjusted reference voltage signal input to the second input terminal 3 of the comparison element U1A, the reference voltage adjustment module further includes: a filtering unit connected between the third terminal of the resistance unit and the second input terminal 3 of the comparison element U1A, for filtering the adjusted reference voltage output by the resistance unit.

[0054] 3 , the filtering unit includes: a fourth resistor R5, a first end of which is connected to the second end of the first resistor R4, and a second end of which is connected to the second input terminal 3 of the comparison element U1A; a first capacitor C1, a first end of which is connected to the second end of the fourth resistor R5, and a second end of which is grounded; and a second capacitor C2, a first end of which is connected to the first end of the fourth resistor R5, and a second end of which is grounded.

[0055] In conjunction with Figure 3, in one embodiment, the supply voltage adjustment module includes an optocoupler element U2, a voltage control unit 30 and a voltage adjustment unit 20, the optocoupler element U2, a first end is connected to the output end 3 of the comparison element U1A, and a second end is connected to the voltage control unit 30, the optocoupler element U2 is turned on or off based on the comparison result output by the comparison element U1A to transmit the comparison result to the voltage control unit 30; the voltage control unit 30 is connected to the voltage adjustment unit 20, and is used to send a control signal to the voltage adjustment unit 20 based on the comparison result; the voltage adjustment unit 20 adjusts the supply voltage V0 based on the control signal.

[0056] The optocoupler element U2 is used to turn on or off based on the comparison result output by the comparison element U1A. For example, the comparison element U1A compares the power supply voltage V0 currently connected to the input terminal with the reference voltage and outputs a high level or a low level, which corresponds to turning off or on the optocoupler element U2. The power supply voltage V0 is divided by the resistor R10 to supply power to the optocoupler element U2. The linear constant current adjustment circuit 120, the encryption protocol circuit 150, the adjustment control element 140, the comparison element U1A, etc. are powered by the power supply voltage VCC. The voltage control unit 30 can determine whether to increase or decrease the current power supply voltage V0 based on the feedback current received when the optocoupler element U2 is turned on and off, and send the adjusted PWM pulse signal to the voltage adjustment unit 20 by adjusting the duty cycle of the PWM pulse signal to control the voltage adjustment unit 20 to adjust the output power supply voltage V0.

[0057] In the embodiment of the present application, the voltage adjustment unit 20 may be an isolated DC-DC converter circuit configured to convert the voltage of the DC power obtained after the AC input undergoes EMI filtering and bridge rectification by the rectifier module 10 to obtain a supply voltage V0 suitable for the target component 110. After the voltage adjustment unit 20 transmits a PWM pulse signal, the supply voltage V0 is adjusted based on the PWM pulse signal before being provided to the target component 110.

[0058] Therefore, after the constant-voltage linear constant-current dimming system is powered on and supplies power to the target element 110 with the initial preset constant supply voltage V0, the linear constant current adjustment circuit 120 connected to the target element 110 obtains its own voltage drop and feeds it back to the adjustment control element 140. The adjustment control element 140 sends a PWM pulse signal to the reference voltage adjustment module 1620 of the voltage regulation circuit 160 based on the voltage drop. The reference voltage adjustment module 1620 adjusts the reference voltage Vref input to the second input terminal 3 of the comparison element U1A based on the PWM pulse signal, and compares it with the supply voltage V0 currently collected at the first input terminal 2 of the comparison element U1A. The optocoupler element U2, the voltage control unit 30 and the voltage adjustment unit 20 match and adjust the current supply voltage V0 of the target element 110 based on the comparison result, so as to adjust the voltage supplied to the target element based on the different voltage specifications of the target element, thereby reducing the invalid voltage drop on the linear constant current adjustment circuit and reducing the power loss on the linear constant current adjustment circuit, thereby improving the overall efficiency of the constant-voltage linear constant current adjustment system and improving the luminous efficiency of the light source module.

[0059] In one embodiment, the linear constant current adjustment circuit 120 also includes: a status detection module, which is used to detect the working status of the target element by detecting the current on the linear constant current adjustment circuit; the feedback module 1240 is also used to feed back the corresponding status information to the adjustment control element when the status detection module detects that the working status of the target element is a short circuit state or an open circuit state, so that the adjustment control element reports a fault based on the status information.

[0060] The linear constant current adjustment circuit 120 is connected to the target element 110. The current on the linear constant current adjustment circuit 120 can reflect the working status of the target element 110. For example, if the linear constant current adjustment circuit 120 does not receive current, it means that the target element 110 is open-circuited; if the linear constant current adjustment circuit 120 receives too much current, it means that the target element 110 is short-circuited.

[0061] The status detection module can detect whether the working status of the target element 110 is open or short-circuited. Both open and short circuits are abnormal states. The working status of the target element 110 can be fed back to the adjustment control element 140 through the feedback module 1240, so that the adjustment control element 140 can report faults based on the status information.

[0062] In one embodiment, the linear constant current adjustment circuit 120 further includes: an information acquisition module for acquiring component information of the target component; the feedback module 1240 is further used to feed back the component information to the adjustment control component so that the adjustment control component records the component information.

[0063] For example, if the target component is a light source module, the component information includes the light source model, production batch, production date, supplier, etc. The component information of the target component 110 can be obtained through the information acquisition module, and the component information can be used for background data analysis and statistics. The component information of the target component 110 can be fed back to the adjustment control component 140 through the feedback module 1240, so that the adjustment control component 140 can record based on the component information and feed it back to the background.

[0064] Based on the solution provided in the above embodiment, optionally, the target component 110 includes an LED light source having multiple LEDs connected in series, and the linear constant current adjustment circuit 120 includes a linear constant current dimming circuit for dimming the LED light source. The LED light source can be a monochromatic LED light source including a group of LEDs connected in series, or a multicolor LED light source including multiple groups of LEDs connected in series. Correspondingly, the component information of the LED light source obtained by the information acquisition module includes one or more of the following: the model, production batch, production date, and supplier of the LED light source.

[0065] 3 , target element 110 includes multiple light sources of different colors. Each color light source is composed of multiple series-connected LEDs emitting the corresponding color. For example, M series-connected color light-emitting diodes CLED1-CLEDM, M series-connected blue light-emitting diodes BLED1-BLEDM, M series-connected white light-emitting diodes WLED1-WLEDM, and M series-connected red light-emitting diodes RLED1-RLEDM. These four color light sources are connected in parallel. A supply voltage V0 powers the corresponding LED light sources formed by these parallel-connected light sources.

[0066] In the embodiment of FIG. 3 , the linear constant current adjustment circuit 120 is a linear constant current dimming circuit for dimming an LED light source. The voltage input terminal of the linear constant current dimming circuit 120 is connected to the LED light source. Thus, the supply voltage V0 is divided by the LED light source to obtain the voltage at the voltage input terminal of the linear constant current dimming circuit 120. In FIG. 3 , the voltage output terminal SGND of the linear constant current dimming circuit 120 is grounded, and the voltage at the voltage output terminal of the linear constant current dimming circuit 120 is 0. Therefore, the voltage drop across the linear constant current dimming circuit 120 can be calculated as the difference between the supply voltage V0 and the voltage of the LED light source. The voltage drop across the linear constant current dimming circuit 120 varies due to the constant supply voltage V0 of the LED light source and the different voltage specifications of the light-emitting diodes in the LED light source.

[0067] The adjustment control element 140 is further configured to send a corresponding dimming signal to the linear constant current adjustment circuit 120 based on a user's dimming control instruction, so that the linear constant current adjustment circuit 120 dims the LED light source based on the dimming signal.

[0068] In an exemplary embodiment, the linear constant current adjustment circuit 120 further includes: a dimming module for dimming the LED light source according to a dimming signal; and the feedback module 1240 is further configured to receive the dimming signal sent by the adjustment control element based on a user's dimming control instruction.

[0069] The constant-voltage, linear, and constant-current adjustment system of the present application can be used for constant-voltage, linear, and constant-current dimming of LED light sources, including adjusting the color and / or color temperature of the LED light source. In this embodiment, the adjustment control element 140 sends a dimming signal to the feedback module 1240 of the linear constant-current adjustment circuit 120, and the dimming module of the linear constant-current adjustment circuit 120 dims the LED light source. The dimming signal can be a return-to-zero dimming signal, and the dimming module performs corresponding dimming / light mixing by analyzing the meaning represented by the return-to-zero dimming signal.

[0070] The adjustment control element 140 can be a single-chip microcomputer, which communicates with the remote control of the user-controlled target element 110 through the wireless control module interface 170 (see Figure 3), thereby receiving the dimming control instructions sent by the user's remote control through the wireless control module interface 170, and sending a corresponding dimming signal to the feedback module 1240 of the linear constant current adjustment circuit 120 based on the user's dimming control instructions.

[0071] Optionally, the feedback module 1240 of the linear constant current regulating circuit 120 is connected to the regulating control element 140 via a single bidirectional communication line, thereby achieving bidirectional data transmission between the linear constant current regulating circuit 120 and the regulating control element 140.

[0072] In combination with Figure 3, based on the solution provided in the above embodiment, optionally, the constant voltage linear constant current adjustment system 100 also includes: an encryption protocol circuit 150, connected between the linear constant current adjustment circuit 120 and the adjustment control element 140, for obtaining the voltage drop ΔV of the linear constant current adjustment circuit 120 itself and feeding it back to the adjustment control element 140.

[0073] The encryption protocol circuit 150 has already performed a handshake protocol with the linear constant current regulation circuit 120 and the regulation control element 140, and can be used to transfer data between the linear constant current regulation circuit 120 and the regulation control element 140. The encryption protocol circuit 150 can be regarded as a shortened version of the microcontroller, which is set up based on cost considerations.

[0074] In one embodiment, the encryption protocol circuit 150 can be used to: transmit the acquisition instruction sent by the adjustment control element 140 to the linear constant current adjustment circuit 120 to instruct the linear constant current adjustment circuit 120 to feed back the voltage drop ΔV to the encryption protocol circuit 120, and the acquisition instruction is sent by the adjustment control element 140 to the encryption protocol circuit 150 after the constant voltage linear constant current adjustment system 100 is powered on.

[0075] In the above embodiment, the encryption protocol circuit 150 actively obtains the voltage drop ΔV from the linear constant current regulation circuit 120 based on the instruction of the adjustment control element 140. After the circuits or devices of the constant voltage linear constant current regulation system 100 are powered on, the adjustment control element 140 adjusts the supply voltage of the target element 110 based on the voltage drop ΔV across the linear constant current regulation circuit 120.

[0076] Of course, in other embodiments, the encryption protocol circuit 150 may also actively send an acquisition instruction to the linear constant current adjustment circuit 120 based on pre-configuration, and transmit the voltage drop of the linear constant current adjustment circuit 120 in response to the acquisition instruction to the adjustment control element 140.

[0077] In one embodiment, the encryption protocol circuit 150 is connected to the linear constant current adjustment circuit 120 via a first communication line, and the encryption protocol circuit 150 is connected to the adjustment control element 140 via a second communication line. Optionally, the first communication line and the second communication line are single lines that implement bidirectional communication lines.

[0078] In an exemplary embodiment, the feedback module 1240 of the linear constant current adjustment circuit 120 is connected to the adjustment control element 140 through a preset encryption protocol circuit 150, one end of the preset encryption protocol circuit 150 is connected to the feedback module 1240 through a first communication line for bidirectional communication, and the other end of the preset encryption protocol circuit 150 is connected to the adjustment control element 140 through a second communication line for bidirectional communication.

[0079] Therefore, the encryption protocol circuit 150 can transmit acquisition instructions, voltage drop on the linear constant current adjustment circuit 120, status information and component information of the target component 110, and dimming signals and other data between the linear constant current adjustment circuit 120 and the adjustment control element 140 through the first communication line and the second communication line.

[0080] In an embodiment of the present application, the reference voltage is adjusted by the reference voltage adjustment module based on the received control signal, the comparison element outputs a comparison result based on the adjusted reference voltage and the current supply voltage of the target element, and the supply voltage adjustment module adjusts the supply voltage of the target element based on the comparison result. Therefore, when different batches of target elements result in different voltage specifications, the overall efficiency of the constant-voltage linear constant-current adjustment system can be improved by adjusting the voltage supplied to the target element.

[0081] The linear constant current adjustment circuit feeds back its own voltage drop to the adjustment control element, and the adjustment control element sends a control signal to the voltage regulation circuit based on the voltage drop. The voltage regulation circuit adjusts the preset constant voltage supplied to the target element connected to the linear constant current adjustment circuit based on the control signal. Therefore, when different batches of target elements lead to different voltage specifications, the voltage supplied to the target element can be adjusted to reduce the invalid voltage drop on the linear constant current adjustment circuit of the constant voltage linear constant current adjustment system, reduce the power loss on the linear constant current adjustment circuit, and thereby improve the overall efficiency of the system and the luminous efficiency of the light source module.

[0082] It should be noted that, in this document, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or apparatus comprising the element.

[0083] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of this application, ordinary technicians in this field can also make many forms without departing from the purpose of this application and the scope of protection of the claims, all of which are within the protection of this application.

Claims

1. A voltage regulating circuit, comprising a reference voltage adjusting module, a comparison element and a supply voltage adjusting module, The reference voltage adjustment module has a first terminal connected to the adjustment control element and a second terminal connected to the comparison element, and the reference voltage adjustment module adjusts the target reference voltage based on the control signal sent by the adjustment control element and outputs the adjusted reference voltage through the second terminal; The comparison element has a first input terminal connected to the supply voltage of the target element, a second input terminal connected to the adjusted reference voltage, an output terminal connected to the supply voltage adjustment module, and the comparison element outputs a comparison result through the output terminal; The supply voltage adjustment module adjusts the supply voltage based on the comparison result.

2. The circuit according to claim 1, wherein The reference voltage adjustment module includes a switch unit and a resistor unit. The switch unit has a first end connected to the adjustment control element and a second end connected to the resistance unit, and the switch unit is turned on or off based on a control signal sent by the adjustment control element; The resistance unit has a first end connected to the switch unit, a second end connected to the target reference voltage, and a third end connected to the second input end of the comparison element. The resistance unit forms a corresponding resistance when the switch unit is turned on and off to determine the adjusted reference voltage connected to the second input end of the comparison element.

3. The circuit according to claim 2, wherein The resistance unit includes a first resistor, a second resistor and a third resistor, The first end of the first resistor is connected to the target reference voltage, and the second end of the first resistor is connected to the first end of the second resistor, the first end of the third resistor, and the second input end of the comparison element respectively; The second end of the second resistor is grounded; The second end of the third resistor is connected to the second end of the switch unit.

4. The circuit according to claim 3, wherein The switch unit includes a MOS transistor, a gate of the MOS transistor is connected to the adjustment control element, a drain of the MOS transistor is connected to the second end of the third resistor, and a source of the MOS transistor is grounded.

5. The circuit according to claim 3 or 4, wherein: The control signal is a PWM pulse signal, and the adjusted reference voltage is determined by the period and duty cycle of the PWM pulse signal, and the resistance structure formed when the PWM pulse signal controls the switching unit to be turned on and off.

6. The circuit according to claim 5, wherein When the PWM pulse signal controls the switch unit to turn off, the third resistor is disconnected, and the voltage at the second end of the first resistor is When the PWM pulse signal controls the switch unit to be turned on, the second resistor and the third resistor are connected in parallel, and the voltage at the second end of the first resistor is The adjusted reference voltage Wherein, Vref represents the target reference voltage, R4 represents the first resistor, R7 represents the second resistor, R6 represents the third resistor, R0 is the parallel resistance of the second resistor and the third resistor, T represents the period of the PWM pulse signal, and D represents the duty cycle of the PWM pulse signal.

7. The circuit according to claim 3 or 4, wherein: The reference voltage adjustment module further includes: The filtering unit is connected between the third terminal of the resistance unit and the second input terminal of the comparison element, and is used for filtering the adjusted reference voltage output by the resistance unit.

8. The circuit according to claim 7, wherein The filtering unit comprises: a fourth resistor, having a first end connected to the second end of the first resistor and a second end connected to the second input end of the comparison element; a first capacitor, having a first end connected to the second end of the fourth resistor and a second end grounded; The second capacitor has a first end connected to the first end of the fourth resistor and a second end grounded.

9. The circuit according to claim 1, wherein The power supply voltage adjustment module includes an optical coupler element, a voltage control unit and a voltage adjustment unit. The optical coupling element has a first end connected to the output end of the comparison element and a second end connected to the voltage control unit, and the optical coupling element is turned on or off based on the comparison result output by the comparison element to transmit the comparison result to the voltage control unit; The voltage control unit is connected to the voltage adjustment unit and is used to send a control signal to the voltage adjustment unit based on the comparison result; The voltage adjustment unit adjusts the supply voltage based on the control signal.

10. The circuit of claim 1, wherein The target element includes an LED light source having a plurality of LEDs connected in series.

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