CN211606883U - LED drive circuit, LED circuit and lamp - Google Patents
LED drive circuit, LED circuit and lamp Download PDFInfo
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- CN211606883U CN211606883U CN201922327541.6U CN201922327541U CN211606883U CN 211606883 U CN211606883 U CN 211606883U CN 201922327541 U CN201922327541 U CN 201922327541U CN 211606883 U CN211606883 U CN 211606883U
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Abstract
The utility model discloses a LED drive circuit, LED circuit and lamps and lanterns, this LED drive circuit, include: the device comprises a load current control circuit, a rectifying module, an energy storage device, a charging path and a first one-way conduction device; the charging path includes: the charging current control module and the second one-way conduction device; the current flowing directions of the first one-way conduction device and the second one-way conduction device are opposite; one end of the energy storage device is connected with the input end of the rectification module, and the two ends of the charging path and the first one-way conduction device are respectively connected with one end of the energy storage device and the grounding end of the rectification module; one end of the load current control circuit is connected with the grounding end of the rectifying module, and the other end of the load current control circuit is used for being connected with the LED load; and the charging current control module is used for controlling the conduction of the energy storage device and the second one-way conduction device and controlling the charging current of the energy storage device in the charging process of the energy storage device. Ripple waves in the circuit can be eliminated, and no stroboflash is achieved.
Description
Technical Field
The utility model relates to a LED drive circuit, LED circuit and lamps and lanterns.
Background
The LED light source is based on a light emitting diode and has the advantages of low-voltage power supply, low energy consumption, strong applicability, high stability, short response time, no environmental pollution, multicolor luminescence and the like. With the continuous development of LED technology, LED light sources are widely used, and scenes such as markets, factories, and houses use a large number of LED light sources as illumination or decoration, and adjust the brightness of the LED light sources as needed to provide comfortable illumination.
Currently, LED driving needs to meet certain performance requirements, for example, referring to the LED driving circuit shown in fig. 1, the LED driving circuit includes: the LED light source control circuit comprises a rectification module connected with an AC input power supply, an LED light source connected with the rectification module, a power control module connected with the LED light source and a capacitor connected with the LED light source in parallel. Referring to fig. 2, the LED driving circuit has good symmetry between the ac input voltage and the ac input current, and a high Power Factor (PF), and can reduce or eliminate harmonic pollution to the Power grid. However, the driving circuit with high PF cannot solve the problem of stroboflash, will cause damage to human eyes when in use, and cannot well meet the requirement of LED illumination.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a can realize high PF of LED light source, do not have stroboscopic LED drive circuit, LED circuit and lamps and lanterns to satisfy the drive demand of actual LED light source.
As the utility model discloses a first aspect of the embodiment, the embodiment of the utility model provides a LED drive circuit is provided, include: the device comprises a load current control circuit, a rectifying module, an energy storage device, a charging path and a first one-way conduction device;
the charging path includes: the charging current control module and the second one-way conduction device; the current flowing directions of the first unidirectional conducting device and the second unidirectional conducting device are opposite;
one end of the energy storage device is connected with the input end of the rectification module, and the two ends of the charging path and the first one-way conduction device are respectively connected with one end of the energy storage device and the grounding end of the rectification module; one end of the load current control circuit is connected with the grounding end of the rectifying module, and the other end of the load current control circuit is used for being connected with an LED load;
and the charging current control module is used for controlling the conduction of the energy storage device and the second one-way conduction device and controlling the charging current of the energy storage device in the charging process of the energy storage device.
In some optional embodiments, the charging current control module includes a first controlled switching tube and a first switching control module, and the first switching control module is configured to control on/off and current when the first controlled switching tube is turned on.
In some optional embodiments, the LED driving circuit further includes: a protection circuit;
and the protection circuit is connected with a circuit formed by connecting the first controlled switching tube and the second one-way conduction device in series and is connected with the first one-way conduction device in parallel.
In some optional embodiments, the first switch control module comprises a first operational amplifier;
the positive phase input end of the first operational amplifier is used for being connected with a first reference voltage, and the negative phase input end of the first operational amplifier is connected with the current output end of the first controlled switching tube; the output end of the first operational amplifier is connected with the control end of the first controlled switch tube.
In some optional embodiments, the first controlled switching tube is an NMOS tube, and the current output end of the first controlled switching tube refers to a source electrode of the NMOS tube, or,
the first controlled switch tube is a bipolar transistor, and the current output end of the first controlled switch tube refers to an emitter of the bipolar transistor.
In some optional embodiments, the first switch control module further comprises: the first current source, the second resistor, the third resistor, the second controlled switch tube and the third controlled switch tube;
the first current source is connected in series with the second resistor and then connected in parallel with a charging loop formed by the energy storage device and the first controlled switch tube;
the positive phase input end of the first operational amplifier is connected between a current source and the second resistor;
the drain electrode of the third controlled switching tube is connected with the rectified input voltage through the third resistor, or the drain electrode of the third controlled switching tube is used for being connected with the output end of the LED load through the third resistor;
the second controlled switch tube and the third controlled switch tube are connected to form a current mirror.
In some optional embodiments, the charging current control module comprises at least one fourth resistor.
In some optional embodiments, the first unidirectional conducting device comprises at least one first diode; the second unidirectional conducting device comprises at least one second diode.
In some optional embodiments, the load current control circuit is a linear control circuit, a buck-type circuit, a fly-back-type circuit, or a boost-type circuit.
As a second aspect of the embodiments of the present invention, an embodiment of the present invention provides a LED circuit, including a LED load and any one of the above-mentioned LED driving circuits.
As the third aspect of the embodiment of the utility model provides a LED lamp, including foretell LED circuit.
The embodiment of the utility model provides an above-mentioned technical scheme's beneficial effect includes at least:
the embodiment of the utility model provides an above-mentioned LED drive circuit, the AC input power supply who connects through rectifier module utilizes busbar voltage to be the characteristics that the sine wave changes, carries out charge-discharge for an energy storage device. The charging current of the energy storage device is controlled by the charging current control module, so that the voltage of the energy storage device can provide stable working voltage for a load, when the bus voltage is greater than the voltage of the energy storage device, the bus voltage charges the energy storage device and provides load current at the same time, and when the bus voltage is less than the voltage of the energy storage device, the LED load is powered by the energy storage device, so that the controlled load is stable in power supply, ripples are eliminated, and no stroboflash can be realized. In addition, the charging current of the energy storage device is used as a part of the alternating current input current, the alternating current input current and the alternating current input voltage can be in a common symmetry axis relation, the width of the alternating current input current is greatly widened when the energy storage device is charged, the waveform consistency of the alternating current input current and the alternating current input voltage is improved, and the PF is improved.
Drawings
FIG. 1 is a schematic diagram of a prior art LED driving circuit;
FIG. 2 is a schematic diagram of the waveform variation of current with voltage in the LED driving circuit shown in FIG. 1;
fig. 3 is a first schematic structural diagram of a driving circuit according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a driving circuit according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram three of a driving circuit according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a driving circuit according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of current and voltage waveforms in the driving circuit shown in FIG. 6;
fig. 8 is a schematic structural diagram of a driving circuit according to an embodiment of the present invention;
FIG. 9 is a schematic diagram of current and voltage waveforms in the driving circuit shown in FIG. 8;
fig. 10 is a schematic structural diagram six of a driving circuit according to an embodiment of the present invention;
fig. 11 is a seventh schematic structural diagram of a driving circuit according to an embodiment of the present invention;
fig. 12 is a schematic structural diagram eight of a driving circuit according to an embodiment of the present invention;
fig. 13 is a schematic structural diagram nine of a driving circuit according to an embodiment of the present invention;
fig. 14 is a schematic structural diagram ten of a driving circuit according to an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
In order to solve LED drive circuit among the prior art and can not satisfy high PF and do not have stroboscopic problem, the embodiment of the utility model provides a LED drive circuit, it is shown with reference to fig. 3, this LED drive circuit, include: the LED load current control circuit comprises a load current control circuit, a rectifying module, an energy storage device, a charging path and a first one-way conduction device, wherein the load current control circuit is used for controlling the connected LED load current;
the charging path includes: the charging current control module and the second one-way conduction device; the current flowing directions of the first one-way conduction device and the second one-way conduction device are opposite;
the rectifying module is connected with an alternating current input power supply AC, one end of the energy storage device is connected with the input end of the rectifying module, and the two ends of the charging path and the first one-way conduction device are respectively connected with one end of the energy storage device and the grounding end of the rectifying module; one end of the load current control circuit is connected with the grounding end of the rectifying module, and the other end of the load current control circuit is used for being connected with the LED load;
and the charging current control module is used for controlling the conduction of the energy storage device and the second one-way conduction device and controlling the charging current of the energy storage device in the charging process of the energy storage device.
In one embodiment, referring to fig. 3, the energy storage device may be a capacitor C1, the first unidirectional conducting device includes at least one first diode D1, and the second unidirectional conducting device includes at least one second diode D2.
The embodiment of the utility model provides a LED drive circuit is through the electric current that charges for the energy storage device to the magnitude of voltage at control energy storage device both ends, the voltage of this energy storage device is used for guaranteeing LED load stable operation. Because the forward conduction voltage VD1 of first diode D1 and the forward conduction voltage VD2 of second diode D2, far be less than the voltage value at energy storage device both ends, therefore, in the embodiment of the utility model discloses, in order to simplify the description complexity of embodiment, though theoretically, when the input voltage after the rectification is greater than the voltage of energy storage device and the forward conduction voltage VD2 sum of second diode D2, charge to energy storage device, and when the input voltage after the rectification is less than the difference between the forward conduction voltage VD1 of energy storage device voltage and first diode D1, energy storage device discharges, in the embodiment of the utility model, when simplifying to be when the input voltage after the rectification is greater than energy storage device's charging voltage, energy storage device gets into the charging process, when the input voltage after the rectification is less than energy storage device's charging voltage, energy storage device gets into the discharging process. In the charging process, the rectifying module, the energy storage device and the charging path form a charging loop, the current can be constant current or current which changes along with the change of certain voltage or current in the driving circuit, and the current in the charging loop of the energy storage device is controlled by the charging current control module; in the discharging process, the energy storage device, the LED load, the load current control circuit and the first one-way conduction device form a discharging loop. The first current path and the second current path realize the path of selective discharging and charging, and can play the roles of preventing current from flowing backwards and electric leakage.
The embodiment of the utility model provides an above-mentioned LED drive circuit, the AC input power supply who connects through rectifier module utilizes busbar voltage to be the characteristics that the sine wave changes, carries out charge-discharge for an energy storage device. The charging current of the energy storage device is controlled by the charging current control module, so that the energy storage device can provide stable working voltage for a load, when the bus voltage is greater than the voltage of the energy storage device, the bus voltage charges the energy storage device and provides load current at the same time, and when the bus voltage is less than the voltage of the energy storage device, the LED load is powered by the energy storage device, so that the controlled load is stable in power supply, ripples are eliminated, and no stroboflash can be realized. In addition, the charging current of the energy storage device is used as a part of the alternating current input current, the alternating current input current and the alternating current input voltage can be in a common symmetry axis relation, the width of the alternating current input current is greatly widened when the energy storage device is charged, the waveform consistency of the alternating current input current and the alternating current input voltage is improved, and the PF is improved.
The following describes in detail a specific implementation of the present invention through several specific embodiments:
example one
In some optional embodiments, the LED driving circuit further comprises: a protection circuit;
and the protection circuit is connected with a circuit formed by connecting the first controlled switching tube and the second one-way conduction device in series and is connected with the first one-way conduction device in parallel.
In one embodiment, as shown with reference to FIG. 4, the protection circuit includes at least one protection resistor RPThe protective resistor RPAnd a circuit connected with the charging current control module in series is connected with the first one-way conduction device in parallel. Through the protective resistor RPThe charging current control module can be protected, and the charging current control module is prevented from being damaged by instantaneous high voltage caused by bus distortion and other factors.
As an embodiment of the present invention, it may be that the charging current control module includes a first controlled switch tube and a first switch control module, and the first switch control module is used for controlling the on-off and the current when conducting of the first controlled switch tube. More specifically, the first controlled switch transistor may be an NMOS transistor M1. Referring to fig. 5, the at least one resistor is a current sampling resistor R1. The alternating current input power supply is connected with a rectifying module, the rectifying module is connected with a capacitor C1, a capacitor C1 is connected with the drain electrode of an NMOS tube M1, the source electrode of the NMOS tube M1 is connected with a current sampling resistor R1, the grid electrode of the NMOS tube M1 is connected with the first switch control module, the current sampling resistor R1 is connected with a second diode D2, a first diode D1 is connected in parallel with two ends of a series circuit formed by the NMOS tube M1, the current sampling resistor R1 and the second diode D2, and the LED load and load current control circuitAfter being connected, the rectifier module and the current loop are formed. In the LED drive circuit, when the bus voltage V is rectifiedINWhen the voltage is higher than the voltage at two ends of the capacitor C1, the rectifier module, the LED load and the load current control circuit form an LED load charging loop, the first switch control module controls the conduction of the NMOS tube M1, the rectifier module, the capacitor C1, the NMOS tube M1, the current sampling resistor R1 and the second diode D2 form a charging loop, and the rectified bus voltage V is used for charging the LED load charging loopINPower is supplied to the LED load and capacitor C1; when rectified bus voltage VINWhen the voltage of the capacitor C1 is lower than the voltage of the two ends, the first switch control module controls the NMOS tube M1 to be switched off, the capacitor C1, the LED load, the load current control circuit and the first diode D1 form a discharge loop, and the capacitor C1 supplies power to the LED load.
In a specific embodiment, the load current control circuit includes an operational amplifier and a load controlled switch transistor, the load controlled switch transistor may be an NMOS transistor M0, wherein a drain of the NMOS transistor M0 is connected to a controlled load, an output terminal of the operational amplifier is connected to a gate of the NMOS transistor M0, and a source of the NMOS transistor M0 is connected to a resistor RCSAnd the operational amplifier is connected to the negative phase input end of the operational amplifier, and the positive phase input end of the operational amplifier is connected with the reference voltage.
It is required to explain, in the embodiment of the utility model, load current control circuit specific implementation mode can refer to other structural style that realize LED load current control among the prior art, its specific circuit implementation mode the embodiment of the utility model provides an do not do strictly limit here, as long as can realize in the circuit current control's requirement can, in the embodiment of the utility model, no longer describe repeatedly.
It should be noted that, in the driving circuit shown in fig. 5, the first controlled switch transistor is an NMOS transistor only as a specific implementation manner of the embodiment of the present invention, and the first controlled switch transistor may also be another current control switch transistor, for example, a bipolar transistor BJT (not shown in the figure), as long as the current can be controlled, so that a charging loop is formed when the capacitor C1 is charged.
Example two
Based on the driving circuit described in the first embodiment, further, the first switch control module in the embodiment of the present invention includes a first operational amplifier;
the positive phase input end of the first operational amplifier is used for being connected with a first reference voltage, and the negative phase input end of the first operational amplifier is connected with the current output end of the first controlled switching tube; the output end of the first operational amplifier is connected with the control end of the first controlled switch tube.
When the first controlled switch tube is an NMOS tube, the current output end of the first controlled switch tube refers to the source electrode of the NMOS tube.
When the first controlled switching tube can also be a bipolar transistor, the current output end of the first controlled switching tube refers to an emitter of the bipolar transistor.
In the following, a detailed description is made by a specific embodiment, referring to the LED driving circuit shown in fig. 6, an ac input power is connected to a rectifying module, the rectifying module is connected to an LED load, the LED load is connected to a load current control circuit, the load current control circuit includes a second operational amplifier and a load-controlled switching tube, the load-controlled switching tube may be an NMOS tube M0, wherein a drain of the NMOS tube M0 is connected to the LED load, an output end of the second operational amplifier AMP2 is connected to a gate of the NMOS tube M0, and a source of the NMOS tube M0 is connected to a resistor R0CSAnd is also connected to the negative input terminal of the second operational amplifier AMP2, and the positive input terminal of the second operational amplifier AMP2 is connected to the second reference voltage VREF 2. The rectifying module is connected with a capacitor C1, the capacitor C1 is connected with the drain electrode of an NMOS tube M1, the source electrode of the NMOS tube M1 is connected with the current sampling resistor R1 and is also connected with the negative phase input end of the first operational amplifier AMP1, the current sampling resistor R1 is connected with the anode of a second diode D2, the cathode of the second diode D2 is grounded, the cathode of a first diode D1 is connected between the capacitor C1 and the drain electrode of the NMOS tube M1, and the anode of the first diode D1 is grounded. The grid electrode of the NMOS tube M1 is connected with the output end of the first operational amplifier AMP 1; the non-inverting input terminal of the first operational amplifier AMP1 is connected to a first reference voltage VREF 1.
In the embodiment of the present invention, the negative phase input terminal of the first operational amplifier AMP1 is connected to the source of the NMOS transistor M1 and the current sampling resistor R1, so that the current regulation can be realized through the regulation of the current sampling resistor R1, and the current control when the energy storage device is charged is realized.
In the embodiment of the present invention, the first reference voltage VREF1 can be a constant value, and the current I generated by the current generation circuitchargeVREF1/R1 is a constant value. The second reference voltage VREF2 may also be a constant value, and the load current ILED＝VREF2/RCSAlso a constant value. The rectifier module is a full-bridge rectifier bridge, and the relation between the rectified AC input current and the rectified AC input current is as follows: i lac | ═ IINAnd I isIN＝Icharge+ILED。
Referring to FIGS. 6 and 7, VC1VD1 and VD2 are forward conduction voltages of diodes D1 and D2, respectively, which are voltages at both ends of the capacitor C1, | Vac | is an ac rectified input voltage, and a waveform of the ac rectified input voltage | Vac | is a half-wave sine wave. When | Vac | is greater than VC1+ VD2, the current generated by the current generating circuitchargeCharging capacitor C1; when | Vac | is less than VC1VD1, the charging process is finished, VD1 is conducted in the forward direction, and the capacitor C1 discharges the LED load until | Vac | is larger than V againC1+ VD2, so cycling, usually VC1Is much larger than the diode forward conduction voltage, which is ignored in the following description for simplicity of analysis. Referring to FIG. 7, T1 indicates that the capacitor C1 is in a charging phase, where | Vac | is greater than VC1Capacitor C1 is in a charged state due to IchargeIs a constant current, then the voltage VC1Is linearly increased, the voltage V of the capacitor C1 in the charging phaseC1Has a variation of Δ VC1＝ (IchargeT1)/C1; t2 shows that the capacitor C1 is in the discharging stage due to the load current ILEDIs a constant value, so voltage VC1Is in a linear descending state, and the voltage V of the capacitor C1 in a discharging stageC1Has a variation of Δ VC1＝(ILEDT2)/C1. When the charging and discharging states of the capacitor C1 are stable, the voltage V of the charging stateC1The variation and the voltage V of the discharge stateC1The amount of change is equal to each other,i.e. conservation of charge is achieved, at which time: (I)charge*T1)/C1＝(ILEDT2)/C1, i.e. Icharge*T1＝ILEDT2, i.e. Icharge＝ILEDT2/T1. Since the ac rectified input voltage | Vac | is periodically varied and has a period Tvac, if the voltage period of the ac rectified input voltage | Vac | is stable, the charging time T1 and the discharging time T2 of the capacitor C1 are also periodic, and the sum of the charging time and the discharging time is equal to the period Tvac of the ac input voltage, i.e., T1+ T2. From the above analysis, it can be easily found that the load voltage V is dependent onLEDAnd a load current ILEDCan be determined by setting Δ VC1Adjusting capacitor C1 and charging current IchargeCan realize VC1≥VLED+VOPWherein V isOPIs the minimum operating voltage of the load current control circuit. It can be seen that the input current I behind the bridgeINThe characteristics are as follows: when | Vac | is less than VC1When, IINZero when | Vac | is greater than VC1When, IIN＝Icharge+ILED. For the controlled load, due to VC1≥VLED+VOP，ILEDIs always a constant value, and is VREF2/RCSEspecially for the LED load, no ripple current is ensured in the LED load, and no stroboflash is realized. Because the capacitor is stable in charging and discharging cycles, it is easy to obtain that the charging current of the energy storage device is used as a part of the alternating input current in one cycle of the alternating input voltage Vac, the alternating input current and the alternating input voltage can be in a common symmetry axis relationship, the width of the alternating input current is greatly widened when the energy storage device is charged, the waveform consistency of the alternating input current and the alternating input voltage is improved, and the PF is improved.
EXAMPLE III
Based on the second embodiment of the driving circuit, the first reference voltage VREF1 may also be changed with a control amount in the circuit, so that the current generated in the current generating circuit is changed accordingly.
As an embodiment of the present invention, on the basis of the driving circuit shown in fig. 6, referring to fig. 8, the first reference voltage is a variable voltage, specifically, the first switch control module may further include: the current source IREF1, the second resistor R2, the third resistor R3, the second controlled switch tube and the third controlled switch tube; for example, the second controlled switch tube and the third controlled switch tube may be NMOS tubes M2 and M3 of the same specification. Wherein:
the current source IREF1 is connected in series with the second resistor R2 and then connected in parallel with a charging loop formed by the capacitor C1 and the NMOS tube M1;
a non-inverting input terminal of the first operational amplifier AMP1 is connected between the current source and the second resistor R2;
the drain electrode of the NMOS tube M3 is connected with the rectified bus voltage V through a third resistor R3INAnd the NMOS transistor M2 and the NMOS transistor M3 are connected to constitute a current mirror.
Referring to fig. 8 and 9, the current I generated by the current generation circuit in the present embodimentchargeAs the bus voltage changes. Specifically, in fig. 8 and 9, the current source IREF1 may be connected to the second resistor R2, and the first reference voltage VREF1 may be generated at the second resistor R2. When the ac input voltage Vac is low, the NMOS transistor M3 is not turned on, the current Icomp flowing through the current mirror is zero, the first reference voltage VERF1 is IREF1 × R2, and the current I generated by the current generation circuit is zerochargeIs VERF 1/R1. In the process of increasing the input voltage | Vac | after the ac rectification, the NMOS transistors M2 and M3 are turned on, the current Icomp increases, the first reference voltage VERF1 is (IREF1-Icomp) × R2, and the current I generated by the current generation circuitchargeIs (IREF1-Icomp) R2/R1. The higher the ac rectified input voltage | Vac |, the larger Icomp, and the smaller the first reference voltage VERF 1.
Referring to FIG. 9, if the current I generated by the current generation circuitchargeConstant, alternating input voltage varies during circuit operation, e.g. when the alternating input voltage Vac increases, due to constant charging current and LED current, and Icharge*T1＝ILEDT2, according to the principle of conservation of charge, T1 and T2 should remain unchanged after the system is stabilizedThe increase of the input voltage results in VC1Also increases, then V will be createdC1And VLED+VOPIncrease in the difference (V)C1Greater than VLED+VOP) Causing a reduction in power supply efficiency. On the contrary, when the AC rectified input voltage Vac is reduced, VC1Also decreases, resulting in VC1Less than VLED+VOPAt this time VC1The load cannot be supplied with enough working current, and the output current will have ripples, which causes stroboscopic effect. By means of the illustrated drive circuit, the current I generated by the current generating circuitchargeThe current I generated by the current generation circuit varies with the variation of the bus voltage when the AC input voltage Vac increaseschargeDecrease, then V can be madeC1Still remains close to VLED+VOPThereby keeping the power supply efficiency at a high level at all times. When the AC input voltage Vac is reduced, the current I generated by the current generation circuitchargeIncreasing, then V can be madeC1Is always slightly larger than VLED+VOPAnd output current is ensured to have no ripple, so that stroboflash is avoided, and the power supply efficiency is always kept at a higher level.
Note that V in FIG. 9C1Has a variation tendency of only VC1Schematic diagram of variation, in practice VC1The change in (c) may be a curve with an upward and downward trend.
Of course, the driving circuit shown in fig. 8 is only one specific embodiment in which the first reference voltage VREF1 changes with the change of the rectified bus voltage in the circuit, and in other embodiments, the first reference voltage VREF1 may also change with the change of other control quantities in the circuit, for example, referring to fig. 10, the drain of the NMOS transistor M3 shown in fig. 8 is connected to the output end of the controlled load through the third resistor R3, and under the condition that the connection mode of other circuits is not changed, the first reference voltage VREF1 may change with the change of the difference value between the rectified bus voltage and the load voltage in the circuit, so as to achieve the same technical effect as the driving circuit shown in fig. 8.
Example four
In one embodiment, the charging current control module of the charging path in the driving circuit may include at least one fourth resistor; the first unidirectional conducting device in the driving circuit comprises at least one first diode D1 and the second unidirectional conducting device in the charging path comprises at least one second diode D2. Referring to fig. 11, the first diode D1 is connected in parallel with the series circuit of the fourth resistor R4 and the diode D2.
As a specific implementation manner of the embodiment of the present invention, this energy storage device can be the electric capacity C1, and the rectifier module connects ac input power before, connects electric capacity C1's one end behind the rectifier module, and electric capacity C1's the other end is connected the fourth resistance R4 of electric current production circuit, utilizes ac input voltage to be the characteristics of sinusoidal wave, realizes carrying out the charging of specific time to electric capacity C1. The current generation circuit can make the voltage across the capacitor C1 reach a certain value VC1Then automatically stopping charging; after the charging stops, the capacitor C1 discharges the LED load through the diode D1, so that the LED load is provided with basically stable voltage, no ripple exists in the circuit, no stroboflash can be realized, and meanwhile, the sum of the charging current and the load current of the capacitor C1 and the alternating current input voltage are in a public symmetry axis relation in a single period, so that the PF of the driving circuit is high. In some alternative embodiments, the fourth resistor R4 may be a variable resistor.
In the LED driving circuits in the first to fourth embodiments, the load current control circuit may be a linear control circuit or a switching control circuit, such as a buck-type circuit shown in fig. 12, a fly-back-type circuit shown in fig. 13, or a boost-type circuit shown in fig. 14. Because the circuit implementation mode of other parts of the LED drive circuit including above-mentioned switch type control circuit is similar with above-mentioned embodiment, specific implementation mode can refer to the detailed description in embodiment one to embodiment four, and, it is to be explained, the utility model discloses in the embodiment, constant current control module's specific implementation mode can refer to other structural modes of realizing controlled load constant current control among the prior art, its specific circuit implementation mode the utility model discloses do not do strictly limit here in the embodiment, as long as can realize in the circuit constant current control's requirement can, the utility model discloses in the embodiment, no longer describe repeatedly.
Based on the same utility model concept, the embodiment of the utility model provides a still provides a LED circuit, including LED load and the LED drive circuit that describes in the above-mentioned embodiment.
With regard to the LED circuit in the above embodiments, the specific manner of performing operation and implementation of the LED driving circuit therein has been described in detail in the above first to fourth embodiments, and will not be elaborated herein.
Based on the same utility model concept, the embodiment of the utility model provides a still provide a LED lamp, including foretell LED circuit.
With regard to the LED lamp in the above embodiments, the specific manner of implementing the operation and implementation of the LED driving circuit of the LED circuit has been described in detail in the first to fourth embodiments, and will not be elaborated herein.
It will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (11)
1. An LED driver circuit comprising: load current control circuit and rectifier module, its characterized in that still includes: the energy storage device, the charging path and the first one-way conduction device;
the charging path includes: the charging current control module and the second one-way conduction device; the current flowing directions of the first unidirectional conducting device and the second unidirectional conducting device are opposite;
one end of the energy storage device is connected with the output end of the rectification module, and the two ends of the charging path and the first one-way conduction device are respectively connected with one end of the energy storage device and the grounding end of the rectification module; one end of the load current control circuit is connected with the grounding end of the rectifying module, and the other end of the load current control circuit is used for being connected with an LED load;
and the charging current control module is used for controlling the conduction of the energy storage device and the second one-way conduction device and controlling the charging current of the energy storage device in the charging process of the energy storage device.
2. The LED driving circuit according to claim 1, wherein the charging current control module comprises a first controlled switch tube and a first switch control module, and the first switch control module is configured to control on/off and current when the first controlled switch tube is turned on.
3. The LED driving circuit according to claim 2, further comprising: a protection circuit;
and the protection circuit is connected with a circuit formed by connecting the first controlled switching tube and the second one-way conduction device in series and is connected with the first one-way conduction device in parallel.
4. The LED driving circuit according to claim 2 or 3, wherein the first switch control module comprises a first operational amplifier;
the positive phase input end of the first operational amplifier is used for being connected with a first reference voltage, and the negative phase input end of the first operational amplifier is connected with the current output end of the first controlled switching tube; the output end of the first operational amplifier is connected with the control end of the first controlled switch tube.
5. The LED driving circuit as claimed in claim 4, wherein the first controlled switch transistor is an NMOS transistor, the current output terminal of the first controlled switch transistor is the source of the NMOS transistor, or,
the first controlled switch tube is a bipolar transistor, and the current output end of the first controlled switch tube refers to an emitter of the bipolar transistor.
6. The LED drive circuit of claim 4, wherein the first switch control module further comprises: the first current source, the second resistor, the third resistor, the second controlled switch tube and the third controlled switch tube;
the first current source is connected in series with the second resistor and then connected in parallel with a charging loop formed by the energy storage device and the first controlled switch tube;
the positive phase input end of the first operational amplifier is connected between a current source and the second resistor;
the drain electrode of the third controlled switching tube is connected with the rectified input voltage through the third resistor, or the drain electrode of the third controlled switching tube is used for being connected with the output end of the LED load through the third resistor;
the second controlled switch tube and the third controlled switch tube are connected to form a current mirror.
7. The LED driving circuit according to claim 1, wherein the charging current control module comprises at least one fourth resistor.
8. The LED driver circuit according to any of claims 1-3, 5-7, wherein the first unidirectional conducting device comprises at least one first diode; the second unidirectional conducting device comprises at least one second diode.
9. The LED driver circuit according to any of claims 1-3 and 5-7, wherein the load current control circuit is a linear control circuit, a buck-type circuit, a fly-back-type circuit or a boost-type circuit.
10. An LED circuit comprising an LED load and the LED driver circuit of any one of claims 1-9.
11. An LED lamp comprising the LED circuit of claim 10.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922327541.6U CN211606883U (en) | 2019-12-20 | 2019-12-20 | LED drive circuit, LED circuit and lamp |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201922327541.6U CN211606883U (en) | 2019-12-20 | 2019-12-20 | LED drive circuit, LED circuit and lamp |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113015288A (en) * | 2019-12-20 | 2021-06-22 | 美芯晟科技（北京）有限公司 | LED drive circuit, related circuit and device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113015288A (en) * | 2019-12-20 | 2021-06-22 | 美芯晟科技（北京）有限公司 | LED drive circuit, related circuit and device |
| CN113015288B (en) * | 2019-12-20 | 2024-02-09 | 美芯晟科技(北京)股份有限公司 | LED drive circuit, related circuit and device |
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