CN113993243B - High-voltage constant-current driving circuit and method - Google Patents
High-voltage constant-current driving circuit and method Download PDFInfo
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- CN113993243B CN113993243B CN202111286089.9A CN202111286089A CN113993243B CN 113993243 B CN113993243 B CN 113993243B CN 202111286089 A CN202111286089 A CN 202111286089A CN 113993243 B CN113993243 B CN 113993243B
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/345—Current stabilisation; Maintaining constant current
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/36—Circuits for reducing or suppressing harmonics, ripples or electromagnetic interferences [EMI]
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
- H05B45/3725—Switched mode power supply [SMPS]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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Abstract
The invention relates to a high-voltage constant-current driving circuit which comprises a rectifier bridge stack, a filter circuit and a switch module which are sequentially and electrically connected with the rectifier bridge stack, an LED lamp string and an energy storage module which are electrically connected with the switch module, and a current limiting module which is electrically connected with the LED lamp string and the energy storage module; the rectifier bridge stack is used for rectifying high-voltage alternating current input into half-wave direct current voltage output; the filter circuit is used for filtering the half-wave direct-current voltage; the switch module is used for controlling the current flow direction of the LED lamp string; the switch module comprises a first switch, and a second switch, a third switch and a fourth switch which are electrically connected with the first switch. The invention can improve the driving efficiency of the LED light source, reduce the peak ripple current, increase the current conduction angle in the half-wave period, flexibly control the serial connection quantity of the LED lamps, and divide the excess voltage by the energy storage module, thereby meeting the actual application requirements.
Description
Technical Field
The invention relates to the technical field of integrated circuit design, in particular to a high-voltage constant-current driving circuit and a method.
Background
In an urban landscape lighting lamp using an LED as a light source, in order to pursue high cost performance, an LED driving circuit generally adopts a simplest driving mode, namely, the LED light sources are connected in series for a certain number, and then a current limiting resistor is connected in series to prevent the LED light sources from being burnt out by overcurrent. And then the rectified high-voltage commercial power is connected to directly light the LED lamp. Although the driving mode can save the cost of using a switching power supply and a constant current driver, the driving mode also brings a plurality of defects to the use of the LED light source: the peak current ripple flowing through the LED light source is too large, so that the service life of the light source is shortened; if the resistance value of the current limiting resistor is increased, the output current becomes smaller, the output power cannot meet the requirement, meanwhile, the current conduction angle becomes smaller, the current conduction time becomes shorter, and the flicker of the light source is easily caused; if the resistance value of the current limiting resistor is reduced, the current peak ripple is too large, and the light emitting efficiency of the light source can be influenced by the too large LED peak ripple, so that the light efficiency is reduced.
Disclosure of Invention
In order to solve the above problems, an object of the present invention is to provide a high-voltage constant-current driving circuit and method capable of improving the driving efficiency of an LED light source, reducing peak ripple current, and increasing the current conduction angle in a half-wave period.
A high-voltage constant-current driving circuit comprises a rectifier bridge stack, a filter circuit and a switch module which are sequentially and electrically connected with the rectifier bridge stack, an LED lamp string and an energy storage module which are electrically connected with the switch module, and a current limiting module which is electrically connected with the LED lamp string and the energy storage module; the rectifier bridge stack is used for rectifying high-voltage alternating current input into half-wave direct current voltage output; the filter circuit is used for filtering the half-wave direct-current voltage; the switch module is used for controlling the current flow direction of the LED lamp string; the switch module comprises a first switch, and a second switch, a third switch and a fourth switch which are electrically connected with the first switch.
In addition, the high-voltage constant-current driving circuit provided by the invention can also have the following additional technical characteristics:
further, the energy storage module comprises a second capacitor and a third capacitor which are sequentially connected; the upper electrode plate of the second capacitor is electrically connected with a node formed by the second switch and the third switch, and the upper electrode plate of the third capacitor is electrically connected with a node formed by the fourth switch and the lower electrode plate of the second capacitor.
Further, the current limiting module comprises a first resistor and a second resistor; the first end of the first resistor is electrically connected with the LED lamp string, the first end of the second resistor is electrically connected with the lower polar plate of the third capacitor, and the second ends of the first resistor and the second resistor are grounded.
Another embodiment of the present invention provides a high-voltage constant-current driving method applied to the above-mentioned high-voltage constant-current driving circuit, the method includes:
detecting the voltage amplitude of half-wave direct current voltage, and dividing the half-wave voltage into a plurality of voltage partitions according to the rising stage and the falling stage of the voltage;
and selecting the conduction state of each switch in the switch module according to the voltage partition, and controlling the current flow direction in the LED lamp string.
Further, the plurality of voltage partitions are respectively: a1, A2, A3, A4;
in the voltage rising stage, the voltage amplitude U of the half-wave direct-current voltage is A1 partition when the voltage amplitude U of the half-wave direct-current voltage meets the condition Vf < = U < = V1, and the voltage amplitude U of the half-wave direct-current voltage is A2 partition when the voltage amplitude U of the half-wave direct-current voltage meets the condition V1< U < = V2;
in the voltage dropping stage, the voltage amplitude U of the half-wave direct-current voltage is the A3 partition when the voltage amplitude U of the half-wave direct-current voltage meets the condition V1< U < V2; the voltage amplitude U of the half-wave direct-current voltage meets the condition Vf < = U < = V1 and is A4 partition; v1 is the direct current input voltage of the maximum allowable peak current of the LED lamp string, V2 is the peak voltage after half-wave rectification, and Vf is the conduction voltage drop of the LED lamp string.
Further, the method for controlling the current flow direction in the LED string comprises the steps of:
in the partition A1, when the voltage amplitude U meets the condition Vf < = U < = V1, the second switch and the third switch are opened, the first switch and the fourth switch are closed, and the first current path and the second current path are conducted;
in the partition A2, when the voltage amplitude U meets the condition V1< U < = V2, the first switch and the third switch are turned off, the second switch and the fourth switch are turned off, and the third current path and the fourth current path are turned on;
in the partition A3, when the voltage amplitude U meets the condition V1< U < V2, the first switch, the second switch and the fourth switch are turned off, the third switch is turned on, and the fifth current path is turned on;
in the partition A4, when the voltage amplitude U satisfies the condition Vf < =u < =v1, the second switch and the third switch are opened, the first switch and the fourth switch are closed, and the first current path and the second current path are turned on.
Further, the first current path comprises a first switch, an LED lamp string and a first resistor which are sequentially communicated, the second current path comprises a first switch, a fourth switch, a third capacitor and a second resistor which are sequentially communicated, when the voltage amplitude U reaches V1, the first current in the first current path is cut off after reaching a peak value, the second current in the second current path is cut off, the third capacitor stores energy, and the second resistor limits current; where peak imax= (V1-Vf)/R1.
Further, the third current path comprises a second switch, a second capacitor, a fourth switch, an LED lamp string and a first resistor which are sequentially communicated, the fourth current path comprises the second switch, the second capacitor, a third capacitor and the second resistor which are sequentially communicated, the capacitor voltage at two ends of the third capacitor is always kept larger than the Vf value, the voltage exceeding V1 is loaded on the first capacitor, the first capacitor performs energy storage and voltage division, and meanwhile part of fourth current in the fourth current path flows through the second capacitor and the third capacitor to charge the third capacitor so as to maintain the change of the voltage at two ends of the LED lamp string; wherein the third capacitance c3= (V2-V1) C2/V1.
Further, the fifth current path comprises a third capacitor, a second capacitor, a third switch, an LED lamp string, a first resistor and a second resistor which are sequentially communicated, when the capacitor voltage summation at two ends of the second capacitor and the third capacitor reaches the peak voltage V2, the LED lamp string is powered by the second capacitor and the third capacitor energy storage capacitor, and the first resistor and the second resistor are used for limiting current.
Further, when the voltage U drops to U < = V1, the first current path and the second current path are turned on again, and the current flowing through the LED lamp string starts from the peak value and gradually becomes smaller until the voltage U is smaller than the Vf value, and the current is cut off.
The high-voltage constant-current driving circuit comprises a rectifier bridge pile, a filter circuit and a switch module which are sequentially and electrically connected with the rectifier bridge pile, an LED lamp string and an energy storage module which are electrically connected with the switch module, and a current limiting module which is electrically connected with the LED lamp string and the energy storage module; the rectifier bridge is used for rectifying high-voltage alternating current input into half-wave direct current voltage output; the filter circuit is used for filtering the half-wave direct-current voltage; the switch module is used for controlling the current flow direction of the LED lamp string; the switch module comprises a first switch, and a second switch, a third switch and a fourth switch which are electrically connected with the first switch. The invention can improve the driving efficiency of the LED light source, reduce the peak ripple current, increase the current conduction angle in the half-wave period, flexibly control the serial connection quantity of the LED lamps, and divide the excess voltage by the energy storage module, thereby meeting the actual application requirements.
Drawings
Fig. 1 is a circuit diagram of a high-voltage constant-current driving circuit according to an embodiment of the present invention;
FIG. 2 is a flow chart of a high-voltage constant-current driving method according to an embodiment of the present invention;
FIG. 3 is a voltage partition diagram of a high-voltage constant-current driving circuit according to an embodiment of the present invention;
fig. 4 is a current flow chart of a partition A1 in the high-voltage constant-current driving circuit according to the embodiment of the present invention;
fig. 5 is a current flow chart of a partition A2 in the high-voltage constant-current driving circuit according to the embodiment of the present invention;
fig. 6 is a current flow chart of a partition A3 in the high-voltage constant-current driving circuit according to the embodiment of the present invention;
fig. 7 is a waveform diagram of a current flowing through an LED string in the high-voltage constant-current driving circuit according to an embodiment of the present invention.
The invention will be further described in the following detailed description in conjunction with the above-described figures.
Detailed Description
In order that the objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings. Several embodiments of the invention are presented in the figures. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "mounted" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," "upper," "lower," and the like are used herein for descriptive purposes only and not to indicate or imply that the apparatus or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the invention.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
The maximum value of the low-oscillation amplitude node oscillation signal of the existing basic single-pin crystal oscillator is limited by the power supply voltage, so that the power supply noise can deteriorate the phase noise to a large extent; the minimum value of the high-oscillation amplitude node oscillation signal can only be indirectly limited by the limit of VSS, but the minimum value of the high-oscillation amplitude node oscillation signal is far lower than VSS, so that an ESD circuit is frequently triggered, and latch-up is easy to occur.
Based on the above problems, as shown in fig. 1, an embodiment of the present invention discloses a high-voltage constant-current driving circuit, which includes a rectifier bridge BD1, a filter circuit and a switch module electrically connected with the rectifier bridge BD1 in sequence, an LED string and an energy storage module electrically connected with the switch module, and a current limiting module electrically connected with the LED string and the energy storage module. The rectifier bridge BD1 is configured to rectify a high-voltage ac input into a half-wave dc voltage and output the half-wave dc voltage; the filter circuit is used for filtering the half-wave direct-current voltage; and the switch module is used for controlling the current flow direction of the LED lamp string. The second end 2 and the first end 1 of the rectifying bridge BD1 are respectively electrically connected with the L end and the N end of the high-voltage alternating current, the third end 3 of the rectifying bridge is electrically connected with the switch module, and the fourth end of the rectifying bridge is grounded 4. The filter circuit comprises a first capacitor C1, the first capacitor C1 is a filter capacitor, an upper polar plate of the filter capacitor is electrically connected with a third end 3 of the rectifier bridge stack BD1, and a lower polar plate of the filter capacitor is grounded.
Further, the switch module includes a first switch K1, a second switch K2, a third switch K3, and a fourth switch K4. The node formed by the first end of the first switch K1 and the first end of the second switch K2 is electrically connected with the third end 3 of the rectifier bridge BD1, the second end of the second switch K2 is electrically connected with the second end of the third switch K3, and the node formed by the first end of the third switch K3 and the first end of the fourth switch K4 is electrically connected with the second end of the first switch K1.
Further, the LED lamp string comprises a first LED lamp LED1, a second LED lamp LED2, a third LED lamp LED3, a fourth LED lamp LED4 and a fifth LED lamp LED5 which are sequentially connected. The first end of the first LED lamp LED1 is electrically connected to the second end of the first switch K1 and the node formed by the first end of the third switch K3 and the first end of the fourth switch K4. It will be appreciated that in other embodiments, the number of the LED lamps may be adjusted according to actual requirements.
Further, the energy storage module comprises a second capacitor C2 and a third capacitor C3 which are sequentially connected. The upper electrode plate of the second capacitor C2 is electrically connected to a node formed by the second end of the second switch K2 and the second end of the third switch K3, and the upper electrode plate of the third capacitor C3 is electrically connected to a node formed by the second end of the fourth switch K4 and the lower electrode plate of the second capacitor C2.
Further, the current limiting module includes a first resistor R1 and a second resistor R2. The first end of the first resistor R1 is electrically connected with the LED string, the first end of the second resistor R2 is electrically connected with the lower electrode plate of the third capacitor C3, and the second ends of the first resistor R1 and the second resistor R2 are grounded.
It will be appreciated that the present invention is in the half-wave rectified voltage rise phase: when the detected input voltage is smaller than a certain threshold value, namely the current is smaller than the rated peak current of the LED lamp string, the switch module guides the current to flow through the LED lamp string; when the input voltage is detected to be higher than a certain rated threshold value, namely, the current is higher than the rated peak current of the LED lamp string, the switch module guides the current to flow through the energy storage module, the energy storage module plays roles of energy storage and voltage division, and meanwhile, the current flowing through the LED lamp string is continuously conducted. In the half-wave rectified voltage drop phase: when the input voltage is detected to be higher than a certain rated threshold value, the switch module cuts off the external input voltage, and the energy storage module is conducted to supply power; when the detected input voltage is smaller than a certain threshold value, the switch module is connected with the external input voltage, and current directly flows through the LED lamp string.
The invention provides a high-voltage constant-current driving circuit which comprises a rectifier bridge stack, a filter circuit and a switch module which are sequentially and electrically connected with the rectifier bridge stack, an LED lamp string and an energy storage module which are electrically connected with the switch module, and a current limiting module which is electrically connected with the LED lamp string and the energy storage module; the rectifier bridge stack is used for rectifying high-voltage alternating current input into half-wave direct current voltage output; the filter circuit is used for filtering the half-wave direct-current voltage; the switch module is used for controlling the current flow direction of the LED lamp string; the switch module comprises a first switch, and a second switch, a third switch and a fourth switch which are electrically connected with the first switch. The invention can improve the driving efficiency of the LED light source, reduce the peak ripple current, increase the current conduction angle in the half-wave period, flexibly control the serial connection quantity of the LED lamps, and divide the excess voltage by the energy storage module, thereby meeting the actual application requirements.
As shown in fig. 2, a flow chart of a high-voltage constant-current driving method provided by the invention is shown, and the method comprises steps S21 to S22:
step S21, detecting the voltage amplitude of the half-wave direct-current voltage, and dividing the half-wave voltage into a plurality of voltage partitions according to the rising stage and the falling stage of the voltage.
Referring to fig. 3, the voltage partitions are respectively: a1, A2, A3, A4. In particular, the method comprises the steps of,
in the voltage rising stage, the voltage amplitude U of the half-wave direct-current voltage is A1 partition when the voltage amplitude U of the half-wave direct-current voltage meets the condition Vf < = U < = V1, and the voltage amplitude U of the half-wave direct-current voltage is A2 partition when the voltage amplitude U of the half-wave direct-current voltage meets the condition V1< U < = V2;
in the voltage dropping stage, the voltage amplitude U of the half-wave direct-current voltage is the A3 partition when the voltage amplitude U of the half-wave direct-current voltage meets the condition V1< U < V2; the voltage amplitude U of the half-wave direct-current voltage meets the condition Vf < = U < = V1 and is A4 partition; v1 is the direct current input voltage of the maximum allowable peak current of the LED lamp string, V2 is the peak voltage after half-wave rectification, and Vf is the conduction voltage drop of the LED lamp string.
And S22, selecting the conduction state of each switch in the switch module according to the voltage partition, and controlling the current flow direction in the LED lamp string.
Specifically, in the partition A1, when the voltage amplitude U satisfies the condition Vf < = U < = V1, the second switch K2 and the third switch K3 are opened, the first switch K1 and the fourth switch K4 are closed, and the first current path I1 and the second current path I2 are turned on;
in the partition A2, when the voltage amplitude U meets the condition V1< U < = V2, the first switch K1 and the third switch K3 are opened, the second switch K2 and the fourth switch K4 are closed, and the third current path I3 and the fourth current path I4 are conducted;
in the partition A3, when the voltage amplitude U meets the condition V1< U < V2, the first switch K1, the second switch K2 and the fourth switch K4 are opened, the third switch K3 is closed, and the fifth current path I5 is opened;
in the partition A4, when the voltage amplitude U satisfies the condition Vf < =u < =v1, the second switch K2 and the third switch K3 are turned off, the first switch K1 and the fourth switch K4 are turned on, and the first current path I1 and the second current path I2 are turned on.
Further, referring to fig. 4, the first current path I1 includes a first switch K1, an LED light string and a first resistor R1 that are sequentially connected, the second current path I2 includes a first switch K1, a fourth switch K4, a third capacitor C3 and a second resistor R2 that are sequentially connected, when the voltage amplitude U reaches V1, a first current in the first current path I1 is cut off after reaching a peak value, a second current in the second current path I2 is cut off, the third capacitor C3 stores energy, and the second resistor R2 limits current. It can be understood that, first, the second current path is turned on, the second current flows through the capacitor C3, when the voltage of C3 exceeds the Vf value of the LED string, the first current path is turned on, the first current flows through the LED string, the first resistor R1 plays a role in current limiting, the first current gradually rises along with the voltage rise, when the voltage amplitude U reaches V1, the first current is turned off after reaching the peak value Imax, and the second current is turned off; the capacitor C3 is used for storing energy, and the resistor R2 is used for limiting current.
Further, referring to fig. 5, the third current path I3 includes a second switch K2, a second capacitor C2, a fourth switch K4, an LED lamp string and a first resistor R1 that are sequentially connected, the fourth current path I4 includes the second switch K2, the second capacitor C2, the third capacitor C3 and the second resistor R2 that are sequentially connected, the capacitor voltage at two ends of the third capacitor C3 is always greater than Vf, the voltage exceeding V1 is loaded on the first capacitor C1, the function of energy storage and voltage division is achieved, the first capacitor C1 performs energy storage and voltage division, and meanwhile, part of the fourth current in the fourth current path I4 flows through the second capacitor C and the third capacitor C3, and charges the third capacitor C3 to maintain the voltage change at two ends of the LED lamp string.
Further, referring to fig. 6, the fifth current path I5 includes a third capacitor C3, a second capacitor C2, a third switch K3, an LED lamp string, a first resistor R1 and a second resistor R2 that are sequentially connected, and when the capacitor voltages at two ends of the second capacitor C2 and the third capacitor C3 add up to the peak voltage V2, the LED lamp string is powered by the capacitor energy storage capacitor of the second capacitor C2 and the third capacitor C3, and the first resistor R1 and the second resistor R2 perform current limiting.
In the partition A4, when the voltage U drops to U < = V1, the switches K2 and K3 are opened, the switches K1 and K4 are closed, the first current path and the second current path are turned on again, the current flowing through the LED lamp string starts from the peak value Imax and gradually becomes smaller until the voltage U is smaller than the Vf value, and the current is cut off.
Referring to fig. 7, the present invention is in the half-wave rectified voltage rising phase: when the detected input voltage is smaller than a certain threshold value, namely the current is smaller than the rated peak current of the LED lamp string, the switch module guides the current to flow through the LED lamp string; when the input voltage is detected to be higher than a certain rated threshold value, namely, the current is higher than the rated peak current of the LED lamp string, the switch module guides the current to flow through the energy storage module, the energy storage module plays roles of energy storage and voltage division, and meanwhile, the current flowing through the LED lamp string is continuously conducted. In the half-wave rectified voltage drop phase: when the input voltage is detected to be higher than a certain rated threshold value, the switch module cuts off the external input voltage, and the energy storage module is conducted to supply power; when the detected input voltage is smaller than a certain threshold value, the switch module is connected with the external input voltage, and current directly flows through the LED lamp string.
Specifically, assuming that the voltage drop of the LED string is Vf, the rated allowable maximum current is Imax; the current limiting resistor is R1, wherein r1=r2, and the R1 parameter can be selected and determined according to requirements in consideration of the working efficiency of the circuit. From the formula imax= (V1-Vf)/R1, v1= (R1 x Imax) +vf; a rectified half-wave peak voltage v2= V2*U effective value; is determined by the current input voltage effective value U. Calculating a formula f=1/(2pi RC) by an RC filter circuit, wherein f is the cut-off frequency of the RC filter circuit, the half-wave frequency rectified by a rectifier bridge BD1 is 100Hz, f is reduced to about 10 times in order to allow lower frequency to pass through the circuit, and if f is f1=100/10, the capacitance value C2=1/(2pi Rf1) is calculated; the value of the capacitor C3 is expressed by the formula c2/c3=v1/(V2-V1), and c3= (V2-V1) ×c2/V1 can be obtained.
The invention provides a high-voltage constant-current driving method, which is used for detecting the voltage amplitude of half-wave direct-current voltage and dividing the half-wave voltage into four voltage partitions according to the rising stage and the falling stage of the voltage; and selecting the conduction state of each switch in the switch module according to the voltage partition, and controlling the current flow direction in the LED lamp string. The invention can improve the driving efficiency of the LED light source, reduce the peak ripple current, increase the current conduction angle in the half-wave period, flexibly control the serial connection quantity of the LED lamps, and divide the excess voltage by the energy storage module, thereby meeting the actual application requirements.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The foregoing examples illustrate only a few embodiments of the invention and are described in detail herein without thereby limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (10)
1. The high-voltage constant-current driving circuit is characterized by comprising a rectifier bridge stack, a filter circuit and a switch module which are sequentially and electrically connected with the rectifier bridge stack, an LED lamp string and an energy storage module which are electrically connected with the switch module, and a current limiting module which is electrically connected with the LED lamp string and the energy storage module; the rectifier bridge stack is used for rectifying high-voltage alternating current input into half-wave direct current voltage output; the filter circuit is used for filtering the half-wave direct-current voltage; the switch module is used for controlling the current flow direction of the LED lamp string; the switch module comprises a first switch, a second switch, a third switch and a fourth switch, wherein the second switch, the third switch and the fourth switch are electrically connected with the first switch;
the second end and the first end of the rectifier bridge stack are respectively and electrically connected with the L end and the N end of the high-voltage alternating current, the third end of the rectifier bridge stack is electrically connected with the switch module, and the fourth end of the rectifier bridge stack is grounded;
the filter circuit comprises a first capacitor, wherein the first capacitor is a filter capacitor, an upper polar plate of the filter capacitor is electrically connected with a third end of the rectifier bridge stack, and a lower polar plate of the filter capacitor is grounded;
a node formed by the first end of the first switch and the first end of the second switch is electrically connected with a third end of the rectifier bridge stack, the second end of the second switch is electrically connected with a second end of the third switch, and a node formed by the first end of the third switch and the first end of the fourth switch is electrically connected with a second end of the first switch;
the LED lamp string comprises a first LED lamp, a second LED lamp, a third LED lamp, a fourth LED lamp and a fifth LED lamp which are sequentially connected, wherein the first end of the first LED lamp is electrically connected with a node formed by the second end of the first switch and the first end of the third switch and the first end of the fourth switch;
in the half-wave rectified voltage rise phase: when the detected input voltage is smaller than a certain threshold value, namely the current is smaller than the rated peak current of the LED lamp string, the switch module guides the current to flow through the LED lamp string; when the input voltage is detected to be higher than a certain rated threshold value, namely, the current is higher than the rated peak current of the LED lamp string, the switch module guides the current to flow through the energy storage module, the energy storage module plays roles of energy storage and voltage division, and meanwhile, the current flowing through the LED lamp string is continuously conducted;
in the half-wave rectified voltage drop phase: when the input voltage is detected to be higher than a certain rated threshold value, the switch module cuts off the external input voltage, and the energy storage module is conducted to supply power; when the detected input voltage is smaller than a certain threshold value, the switch module is connected with the external input voltage, and current directly flows through the LED lamp string.
2. The high-voltage constant-current driving circuit according to claim 1, wherein the energy storage module comprises a second capacitor and a third capacitor which are sequentially connected; the upper electrode plate of the second capacitor is electrically connected with a node formed by the second switch and the third switch, and the upper electrode plate of the third capacitor is electrically connected with a node formed by the fourth switch and the lower electrode plate of the second capacitor.
3. The high voltage constant current driving circuit according to claim 2, wherein the current limiting module comprises a first resistor and a second resistor; the first end of the first resistor is electrically connected with the LED lamp string, the first end of the second resistor is electrically connected with the lower polar plate of the third capacitor, and the second ends of the first resistor and the second resistor are grounded.
4. A high-voltage constant-current driving method, characterized by being applied to the high-voltage constant-current driving circuit as claimed in any one of claims 1 to 3, comprising:
detecting the voltage amplitude of half-wave direct current voltage, and dividing the half-wave direct current voltage into a plurality of voltage partitions according to the rising stage and the falling stage of the voltage;
and selecting the conduction state of each switch in the switch module according to the voltage partition, and controlling the current flow direction in the LED lamp string.
5. The method according to claim 4, wherein the plurality of voltage partitions are respectively: a1, A2, A3, A4;
in the voltage rising stage, the voltage amplitude U of the half-wave direct-current voltage is A1 partition when the voltage amplitude U of the half-wave direct-current voltage meets the condition Vf < = U < = V1, and the voltage amplitude U of the half-wave direct-current voltage is A2 partition when the voltage amplitude U of the half-wave direct-current voltage meets the condition V1< U < = V2;
in the voltage dropping stage, the voltage amplitude U of the half-wave direct-current voltage is the A3 partition when the voltage amplitude U of the half-wave direct-current voltage meets the condition V1< U < V2; the voltage amplitude U of the half-wave direct-current voltage meets the condition Vf < = U < = V1 and is A4 partition; v1 is the direct current input voltage of the maximum allowable peak current of the LED lamp string, V2 is the peak voltage after half-wave rectification, and Vf is the conduction voltage drop of the LED lamp string.
6. The method of claim 5, wherein selecting the on state of each switch in the switch module according to the voltage partition, and controlling the current flow direction in the LED string comprises:
in the partition A1, when the voltage amplitude U meets the condition Vf < = U < = V1, the second switch and the third switch are opened, the first switch and the fourth switch are closed, and the first current path and the second current path are conducted;
in the partition A2, when the voltage amplitude U meets the condition V1< U < = V2, the first switch and the third switch are turned off, the second switch and the fourth switch are turned off, and the third current path and the fourth current path are turned on;
in the partition A3, when the voltage amplitude U meets the condition V1< U < V2, the first switch, the second switch and the fourth switch are turned off, the third switch is turned on, and the fifth current path is turned on;
in the partition A4, when the voltage amplitude U satisfies the condition Vf < =u < =v1, the second switch and the third switch are opened, the first switch and the fourth switch are closed, and the first current path and the second current path are turned on.
7. The method of claim 6, wherein the first current path comprises a first switch, an LED string and a first resistor which are sequentially connected, the second current path comprises a first switch, a fourth switch, a third capacitor and a second resistor which are sequentially connected, when the voltage amplitude U reaches V1, the first current in the first current path is cut off after reaching a peak value, the second current in the second current path is cut off, the third capacitor stores energy, and the second resistor limits current; where peak imax= (V1-Vf)/R1.
8. The method of claim 6, wherein the third current path comprises a second switch, a second capacitor, a fourth switch, an LED string and a first resistor which are sequentially communicated, the fourth current path comprises a second switch, a second capacitor, a third capacitor and a second resistor which are sequentially communicated, the capacitor voltage at two ends of the third capacitor is always kept larger than Vf value, the voltage exceeding V1 is loaded on the first capacitor, the first capacitor stores and divides energy, and meanwhile, part of the fourth current in the fourth current path flows through the second capacitor and the third capacitor to charge the third capacitor so as to maintain the voltage change at two ends of the LED string; wherein the third capacitance c3= (V2-V1) C2/V1.
9. The method of claim 6, wherein the fifth current path comprises a third capacitor, a second capacitor, a third switch, an LED string, a first resistor and a second resistor, which are sequentially connected, and when the sum of the capacitor voltages at two ends of the second capacitor and the third capacitor reaches the peak voltage V2, the LED string is powered by the second capacitor and the third capacitor energy storage capacitor, and the first resistor and the second resistor perform current limiting.
10. The method according to claim 7, wherein when the voltage U drops to U < = V1, the first current path and the second current path are turned back on, and the current flowing through the LED string starts from a peak value and gradually decreases until the voltage U is smaller than Vf, and the current is turned off.
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| CN113993243A (en) | 2022-01-28 |
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