CN213073192U - Low-power-consumption constant-current control circuit - Google Patents
Low-power-consumption constant-current control circuit Download PDFInfo
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- CN213073192U CN213073192U CN202022329852.9U CN202022329852U CN213073192U CN 213073192 U CN213073192 U CN 213073192U CN 202022329852 U CN202022329852 U CN 202022329852U CN 213073192 U CN213073192 U CN 213073192U
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Abstract
The utility model discloses a low-power consumption constant current control circuit, second switch unit is connected to its second comparator output, through the invariant of second switch unit control load current. The second comparator directly gets electricity from the bus through the second reference generation module to guarantee working voltage of the second comparator, so that the problem that power consumption is too large due to too high voltage of the main power constant current control module caused by getting electricity from the low potential end of the load is avoided, power consumption of the circuit is effectively reduced through a mode of getting electricity from the bus, and high efficiency of the circuit is achieved. The utility model provides a pair of low-power consumption constant current control circuit solves the existing because of the prior artJFET and POWER MOS of traditional linear chip are integrated together, and chip is from VLED‑The end is powered, so that the problem of efficiency reduction of a main power loop chip is solved, and the working efficiency of the LED driving circuit is effectively improved. The utility model discloses the effect is showing, is suitable for extensive popularization.
Description
Technical Field
The utility model relates to a LED drive circuit technical field, in particular to, control circuit of low-power consumption constant current.
Background
LED (Light Emitting Diode) lighting is widely used because of its advantages of high brightness, high efficiency, long life, etc. In recent years, with the progress of society, there is a higher demand for LED lighting, and a high PF (Power Factor), no stroboflash, and high efficiency are required, thereby reducing damage to human eyes and improving the utilization rate of energy.
At present, the traditional LED driving is realized by matching two independent linear chips, and one chip is used as a charging loop to realize high PF; the other chip is used as a main power constant current loop to realize no stroboflash (as shown in fig. 1 to 5), the traditional LED drive circuit mainly comprises a power supply, a capacitor and an LED, a JFET (Junction Field-Effect Transistor) and a POWERMOS (Junction Field Effect Transistor) of the traditional linear chip are integrated, and the chip needs to be driven by a secondary VLED-The terminal is powered, and the obtained voltage is higher than the minimum working voltage V required by the normal work of the chipSTThe chip can work normally, and VSTGenerally far higher than the voltage V of the chip in normal operationG-VTHVoltage of the bus-bar trough, V, to eliminate stroboscopic effectsINMust be greater than VLED+VSTPower consumption P of the main power loop chipLOSS＝ILED×VLED-＝ILED×VSTThis will undoubtedly result in more losses on the main power loop chip, resulting in reduced efficiency.
In view of the above problems, it is desirable to design a solution to the problem of the prior art that since the JFET and POWERMOS of the conventional linear chip are integrated, the chip needs to be driven from VLED-The end gets electricity, which causes the problem of the efficiency reduction of the main power loop chip.
SUMMERY OF THE UTILITY MODEL
To address the above-mentioned shortcomings, the present invention provides a control circuit with low power consumption and constant current, which is used to solve the problem of the prior art that the JFET and power mos of the conventional linear chip are integrated, and the chip needs to be driven from VLED-The end gets electricity, which causes the problem of the efficiency reduction of the main power loop chip.
The utility model provides a low-power consumption constant current control circuit includes rectifier module, load and main power constant current control module, main power constant current control module includes second comparator, second benchmark production module and second switch unit, wherein the second benchmark production module inserts the generating line power and provides the second benchmark reference value for the second comparator; and the second comparator acquires the load electric signal and compares the load electric signal with the second reference value so as to control the second switch unit to work.
Preferably, the charging circuit constant current control module further comprises a first comparator, a first reference generation module and a first switch unit, wherein the first reference generation module is connected to the bus power supply and provides a first reference value for the first comparator;
the charging loop constant current control module is connected with an energy storage module, and the energy storage module and the charging loop constant current control module are connected to two ends of the rectification module;
the first comparator acquires the electrical signal of the energy storage module and compares the electrical signal with the first reference value so as to control the first switch unit to work;
the low potential end of the energy storage module is grounded through a diode, the anode of the diode is grounded, and the cathode of the diode is connected with the energy storage module.
Preferably, the main power constant current control module and the charging loop constant current control module use the same reference generation module.
Preferably, the reference generation module comprises a junction field effect transistor, a voltage conversion unit, a bandgap reference unit and a reference voltage unit, wherein the junction field effect transistor takes power from a bus and provides voltage to the voltage conversion unit; the voltage conversion unit converts the bus voltage into working voltage; the band-gap reference unit converts the working voltage into zero temperature coefficient voltage; the reference voltage unit acquires a preset reference value from the zero temperature coefficient voltage.
Preferably, the reference generating module further comprises an over-temperature protection module, and the over-temperature protection module sets the output value of the reference voltage unit to zero when the temperature is higher than a preset value.
Preferably, the second switch unit and the first switch unit are both MOS transistors, and the MOS transistors operate in a saturation region state.
Preferably, a diode is arranged between the charging loop constant current control module and the energy storage module, the diode is used for preventing current from flowing backwards, and the diode enables the current to be conducted in a single direction from the energy storage module to the charging loop constant current control module.
According to the above technical scheme, the utility model provides a pair of low-power consumption constant current control circuit, second switch unit is connected to its second comparator output, through the invariant of second switch unit control load current. The second comparator directly gets electricity from the bus through the second benchmark generation module and guarantees its operating voltage, thereby avoids getting the too big problem of main power constant current control module's voltage too high power consumption that leads to from load low potential end, and the mode of getting electricity from the bus effectively reduces the power consumption of circuit, realizes the high efficiency of circuit, increase of service life simultaneously. The utility model provides a what prior art existed is because JFET and POWER MOS of traditional linear chip are integrated together, and the chip need be followed VLED-The end is powered, so that the efficiency of the main power loop chip is reduced, the working efficiency of the LED driving circuit is effectively improved, and the LED driving circuit is suitable for wide popularization.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a circuit block diagram of a conventional LED driver circuit;
FIG. 2 is a first waveform diagram illustrating the operation of the conventional LED driving circuit shown in FIG. 1;
FIG. 3 is a second waveform diagram illustrating the operation of the conventional LED driving circuit shown in FIG. 1;
FIG. 4 is a third waveform diagram illustrating the operation of the conventional LED driving circuit shown in FIG. 1;
FIG. 5 is a waveform diagram illustrating the operation of the conventional LED driving circuit shown in FIG. 1;
fig. 6 is a circuit block diagram of a low power consumption constant current control circuit provided in an embodiment of the present invention;
FIG. 7 is a first waveform diagram illustrating the operation of the low power consumption constant current control circuit shown in FIG. 6;
fig. 8 is a second operating waveform diagram of a low-power constant current control circuit shown in fig. 6;
fig. 9 is a third operating waveform diagram of a low-power constant current control circuit shown in fig. 6;
fig. 10 is a fourth waveform diagram illustrating the operation of the low-power constant current control circuit shown in fig. 6.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 6, a specific embodiment of a low power consumption constant current control circuit according to the present invention will now be described. The low-power-consumption constant-current control circuit comprises a rectifying module, a load and a main power constant-current control module, wherein the main power constant-current control module comprises a second comparator, a second reference generation module and a second switch unit, and the second reference generation module is connected to a bus power supply and provides a second reference value for the second comparator; the second comparator obtains the load electric signal and compares the load electric signal with a second reference value, and then the second switch unit is controlled to work. And the second comparator controls the second switch to be switched on and off according to the sampling signal and the reference signal so as to maintain the constant current of the load LED module.
Referring to fig. 1, in the conventional method, the LED negative terminal is powered, and at this time, the voltage of the LED negative terminal must be higher than the minimum working voltage of the chip, but the minimum working voltage of the chip is higher than the voltage of the LED negative terminal. When the voltage of the negative terminal of the LED is lower than the minimum working voltage of the chip, the chip normally works to cause stroboflash, and therefore the trough voltage of the bus is required to be larger than the sum of the LED load voltage and the minimum working voltage of the chip. Please refer to fig. 7 to 10 together, compare with prior art, the utility model discloses thereby with the chip through the generating line directly get the electricity avoid getting the too high problem of consumption of voltage that leads to the main power constant current control module from load low potential end, only need guarantee that switch tube grid voltage and switch tube open the voltage difference and be less than LED negative terminal voltage and just can realize not having the stroboflash, the chip power supply does not receive the restriction of LED negative terminal voltage this moment, effectively reduces the consumption, increases substantially system efficiency, increase of service life.
In this embodiment, the low-power-consumption constant-current control circuit further includes a charging loop constant-current control module, where the charging loop constant-current control module includes a first comparator, a first reference generation module, and a first switch unit, where the first reference generation module is connected to the bus power supply and provides a first reference value for the first comparator; the charging loop constant current control module is connected with an energy storage module, and the energy storage module and the charging loop constant current control module are connected to two ends of the rectifying module; the first comparator obtains the electrical signal of the energy storage module and compares the electrical signal with a first reference value so as to control the first switch unit to work; the low potential end of the energy storage module is grounded through a diode, the anode of the diode is grounded, and the cathode of the diode is connected with the energy storage module.
The energy storage module is controlled to charge and discharge through the charging loop constant current control module, when the rectified input voltage is larger than the voltage of the energy storage module, the energy storage module enters a charging process, at the moment, the rectifying module, the energy storage module and the charging loop constant current control module form a charging loop, a charging and discharging generation circuit generates current from a bus to a grounding end, the current can be constant current or current which changes along with the change of certain voltage or certain current in a driving circuit, and the magnitude of the charging current of the energy storage module can be controlled through the charging loop constant current control module; when the rectified input voltage is smaller than the charging voltage of the energy storage module, the energy storage module enters a discharging process, at the moment, the energy storage module, the LED load, the main power constant current control module and the charging loop constant current control module form a discharging loop, and a current grounding end in the charging loop constant current control module points to the direction of a bus.
When the bus voltage is greater than the voltage of the energy storage module, the bus voltage charges the energy storage module and provides load current at the same time, and when the bus voltage is less than the voltage of the energy storage module, the controlled load is supplied with power through the energy storage module, so that the controlled load is supplied with power stably, and ripples are eliminated. Particularly for the LED load, the voltage of the energy storage module is always slightly larger than the load voltage of the LED load, and no stroboflash can be realized. In addition, the charging current of the energy storage module 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 waveform consistency of the alternating current input current and the alternating current input voltage is improved, and the PF is improved. Wherein the energy storage module can be a capacitor.
When the voltage of the rectified bus is greater than the voltage at the two ends of the capacitor, the first switch unit is conducted to generate current in the direction from the bus to the grounding end, the rectifying module, the capacitor and the switch unit form a charging loop, and the LED load and the capacitor are powered by the voltage of the bus; when the rectified bus voltage is smaller than the capacitor C1When the voltage at two ends is applied, the first switch unit is turned off and the diode D1Generating a current in a direction from a ground terminal to a bus, a capacitor, an LED load, a load current control circuit, and a diode D1Forming a discharge circuit consisting of a capacitor C1Power is supplied to the LED load. The first switch unit and the second switch unit can be NMOS or PMOS electronic elements.
In this embodiment, the main power constant current control module and the charging loop constant current control module use the same reference generation module. The reference generation module comprises a junction field effect transistor, a voltage conversion unit, a band gap reference unit and a reference voltage unit, wherein the junction field effect transistor takes electricity from a bus and provides voltage for the voltage conversion unit; the voltage conversion unit converts the bus voltage into a chip working voltage; the band gap reference unit converts the working voltage of the chip into zero temperature coefficient voltage; the reference voltage unit acquires a preset reference value from the zero temperature coefficient voltage. The reference generation module further comprises an over-temperature protection module, and the over-temperature protection module is used for setting the output value of the reference voltage unit to be zero when the temperature is higher than a preset value. Compared with the prior art, the setting mode omits a reference generation module, and the cost is greatly saved.
The preset reference value comprises VREF1And VREF2The first comparator receives VREF1The voltage signal is compared with the voltage in the voltage signal, and then a control signal is output to control the first switch unit to be switched on or switched off; the second comparator receives VREF2The voltage signal is compared with the voltage in the voltage signal, and then the control signal is output to control the second switch unit to be switched on or switched off. The second switch unit and the first switch unit are MOS tubes which work in a saturation region state. The reference generation module further comprises an over-temperature protection module, the over-temperature protection module can be an independent JFET, and is not limited to the independent JFET in practice, and all the functions of the related performance of the over-temperature protection module are within the protection scope of the present application file as long as the functions can be realized.
In this embodiment, a diode is disposed between the charging loop constant current control module and the energy storage module, the diode is configured to prevent current from flowing backwards, and the diode enables the current to be conducted in one direction from the energy storage module toward the charging loop constant current control module.
Referring to fig. 1 to fig. 10, a specific embodiment of a low power consumption constant current control method according to the present invention will be described. The control method of the low-power constant current specifically comprises the following steps: the reference generating module obtains a reference value from the bus electricity taking, and the reference value respectively provides a reference for the main power constant current control module and the charging loop constant current control module.
The reference value comprises a first reference value and a second reference value, the second comparator controls the second switch unit to work according to the second reference value and the load electric signal, and the first comparator controls the first switch unit to work according to the first reference value and the energy storage module electric signal.
The specific steps of the second benchmark generating module for obtaining the second benchmark reference value from the bus electricity acquisition comprise: after electricity is taken from the bus, the bus voltage is converted into the chip working voltage through the voltage conversion unit and is provided for the band gap reference module, the chip working voltage is converted into the zero temperature coefficient voltage through the band gap reference module, and then the reference voltage unit generates a reference value.
The specific implementation steps can be as follows:
secondary reference generating module secondary bus VINGetting power and providing a second reference value V for the positive input terminal of the second comparatorREF2；
The negative input end of the second comparator obtains a second comparison value from the load;
the second comparator is based on a second reference value VREF2And the second comparison value controls the second switching unit POWERMOS2 to operate.
Slave bus V of first reference generation moduleINGetting power and providing a first reference value V for the positive input terminal of the first comparatorREF1；
The negative input end of the first comparator obtains a first comparison value from the energy storage module;
the first comparator is based on a first reference value VREF1And the first comparison value controls the first switching unit POWERMOS1 to operate.
The specific steps of the first comparator for controlling the first switch unit to work comprise:
when the rectified bus voltage is greater than the voltage at the two ends of the energy storage module, the first comparator controls the first switch unit to be conducted, and the energy storage module is charged;
when the rectified bus voltage is smaller than the voltage at the two ends of the energy storage module, the first comparator controls the first switch unit to be switched off, the diode is in one-way conduction, and the energy storage module discharges.
The second switching unit is operated in the saturation region, i.e. satisfies VG2-VTH≤VLED-In which V isLED-Is the voltage, V, at the low potential end of the LED moduleG2Is the gate voltage of the second switching unit, VTHThe on-voltage of the second switch unit is ensured, so that the LED has no stroboflash.
The power consumption of the main power constant current control module is PLOSS＝ILED×VLED-＝ILED×(VG2-VTH) In which ILEDTo pass through the LED moduleThe current of (2).
In this embodiment, the main power constant current control module and the charging loop constant current control module use the same reference generation module; the standard generation module obtains electricity from the bus and obtains a first standard reference value and a second standard reference value; the reference generation module transmits the first reference value to the first comparator and transmits the second reference value to the second comparator.
In the embodiment, an independent JFET is integrated in the controller, the JFET takes power from a bus, the power supply of a chip is not limited by the voltage of an LED-end, and the POWERMOS module ensures VG2-VTH≤VLED-The power consumption P of a main power loop chip without stroboflash can be realizedLOSS＝ILED×VLED-＝ILED×(VG2-VTH) And (V)G2-VTH) The voltage is far less than the minimum working voltage V of the traditional linear chipSTThereby greatly improving the working efficiency of the system. The method solves the problems existing in the prior art that since the JFET and POWER MOS of the traditional linear chip are integrated together, the chip needs to be VLED-The end is powered, so that the problem of efficiency reduction of a main power loop chip is solved, and the working efficiency of the LED driving circuit is effectively improved.
The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same or similar parts among the embodiments are referred to each other. Details not described in the embodiments of the present invention belong to the prior art known to those skilled in the art.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (7)
1. A low-power-consumption constant-current control circuit comprises a rectifying module, a load and a main power constant-current control module, and is characterized in that the main power constant-current control module comprises a second comparator, a second reference generation module and a second switch unit, wherein the second reference generation module is connected to a bus power supply and provides a second reference value for the second comparator; and the second comparator acquires a load electric signal and compares the load electric signal with the second reference value so as to control the second switch unit to work.
2. The low-power-consumption constant-current control circuit according to claim 1, further comprising a charging loop constant-current control module, wherein the charging loop constant-current control module comprises a first comparator, a first reference generation module and a first switch unit, wherein the first reference generation module is connected to a bus power supply and provides a first reference value for the first comparator;
the charging loop constant current control module is connected with an energy storage module, and the energy storage module and the charging loop constant current control module are connected to two ends of the rectification module;
the first comparator acquires the electrical signal of the energy storage module and compares the electrical signal with the first reference value so as to control the first switch unit to work;
the low potential end of the energy storage module is grounded through a diode, the anode of the diode is grounded, and the cathode of the diode is connected with the energy storage module.
3. The low-power-consumption constant-current control circuit as claimed in claim 2, wherein the main power constant-current control module and the charging loop constant-current control module use the same reference generation module.
4. The low-power-consumption constant-current control circuit according to claim 3, wherein the reference generation module comprises a junction field effect transistor, a voltage conversion unit, a bandgap reference unit and a reference voltage unit, wherein the junction field effect transistor takes power from a bus and supplies voltage to the voltage conversion unit; the voltage conversion unit converts the bus voltage into working voltage; the band-gap reference unit converts the working voltage into zero temperature coefficient voltage; the reference voltage unit acquires a preset reference value from the zero temperature coefficient voltage.
5. The low-power-consumption constant-current control circuit according to claim 4, wherein the reference generation module further comprises an over-temperature protection module, and the over-temperature protection module is configured to set the output value of the reference voltage unit to zero when the temperature is higher than a preset value.
6. The low-power-consumption constant-current control circuit according to any one of claims 2 to 5, wherein the second switch unit and the first switch unit are MOS transistors, and the MOS transistors operate in a saturation region.
7. A low-power-consumption constant-current control circuit according to any one of claims 2 to 5, wherein a diode is arranged between the charging loop constant-current control module and the energy storage module, the diode is used for preventing current backflow, and the diode enables current to conduct in one direction from the energy storage module to the charging loop constant-current control module.
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| CN202022329852.9U CN213073192U (en) | 2020-10-19 | 2020-10-19 | Low-power-consumption constant-current control circuit |
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| CN202022329852.9U CN213073192U (en) | 2020-10-19 | 2020-10-19 | Low-power-consumption constant-current control circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112105123A (en) * | 2020-10-19 | 2020-12-18 | 美芯晟科技（北京）有限公司 | Low-power-consumption constant-current control circuit and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112105123A (en) * | 2020-10-19 | 2020-12-18 | 美芯晟科技（北京）有限公司 | Low-power-consumption constant-current control circuit and method |
| CN112105123B (en) * | 2020-10-19 | 2024-01-23 | 美芯晟科技(北京)股份有限公司 | Low-power-consumption constant-current control circuit and method |
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Address after: Room 01, 10 / F, block a, Tiangong building, No.30 Xueyuan Road, Haidian District, Beijing Patentee after: Meixinsheng Technology (Beijing) Co.,Ltd. Address before: Room 01, 10 / F, block a, Tiangong building, No.30 Xueyuan Road, Haidian District, Beijing Patentee before: MAXIC TECHNOLOGY (BEIJING) Co.,Ltd. |