CN211557577U - Constant current output control system - Google Patents
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- CN211557577U CN211557577U CN202020419177.6U CN202020419177U CN211557577U CN 211557577 U CN211557577 U CN 211557577U CN 202020419177 U CN202020419177 U CN 202020419177U CN 211557577 U CN211557577 U CN 211557577U
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Abstract
The utility model discloses a constant current output control system, relate to the electronic technology field, the positive pole of power is connected with the input of voltage stabilizing module, voltage stabilizing module's output is connected through eighth resistance R8 and transistor M1's gate, transistor M1's source electrode connects the negative pole of first power through third resistance R3, transistor M1's source electrode is connected with control module's input through fifth resistance R5, control module's output is connected through the grid of thirty-four resistance R34 with transistor M1, transistor M1's drain electrode is connected with voltage monitoring module's input through eleventh resistance R11, voltage monitoring module's output connects the optical coupling component through first diode D1, the positive pole of first power is connected with the positive pole of load, eleventh resistance R11 is connected with the negative pole of load with transistor M1's junction. The utility model has the advantages that: the circuit has the advantages of simple structure, low cost, high efficiency and no EMI interference.
Description
Technical Field
The utility model relates to the field of electronic technology, concretely relates to constant current output control system.
Background
The LED lighting technology is developed rapidly by virtue of the characteristics of high efficiency, energy conservation and long service life, but the requirements are brought to a driving power supply of the LED lighting technology due to the semiconductor characteristics of the LED lighting technology: firstly, in the power problem, in order to increase luminous flux, enough power needs to be injected into an LED chip, but the temperature rise of the LED cannot be too high, otherwise the service life and the luminous efficiency are influenced, and because the LED is a diode and has a negative temperature characteristic, only the stable voltage is not enough, and constant current control must be provided; secondly, the LED illumination needs a plurality of LED tubes in series or in parallel. The discrete parameters are an important problem, and manufacturers cannot achieve consistency, so that the problem can be overcome only on a driving power supply, and one lamp is required to be provided with one power supply or one lamp is required to be provided with a plurality of power supply modules to meet the requirement; thirdly, if one of the LEDs is broken, the work of the whole light string is influenced or even extinguished no matter the LEDs are connected in series or in parallel, and an independent protection circuit is needed; fourth, the cost is high, and due to the discreteness and lighting effect, an independent power supply or a plurality of module power supplies are needed for control (especially multiplexed output), which adds higher cost to the lighting system. Of course, there is a corresponding demand for the multi-port constant current output charging technology, and the same problem is faced.
Fig. 1 is a schematic diagram of 2-path output of an LED power supply, an AC input passes through an EMI filter network, and then sequentially passes through a PFC power, a DC/DC conversion, and a BUCK circuit to perform a DC output, a control circuit is connected to the PFC power and the DC/DC conversion, the whole power supply finally generates an output through three-stage conversion, a PFC power factor correction circuit is provided at a front stage, a LLC half-bridge resonance generates a DC output at a rear stage, a BUCK circuit is provided at a third stage to realize 2-path constant current output, and 31V 3A is output at both stages to respectively control two chips of a street lamp. The preceding stage circuit generally has no problem, mainly is the following BUCK circuit, and the EMI problem is troublesome, and is limited by the size of the whole power supply, the higher size of the BUCK working efficiency is reduced, the constant current method is to use the resistance to detect current on the input bus, and because of the continuous working mode, the switch tube and the diode all have the switch loss and the reverse recovery loss, the efficiency of this stage can only be about 96%, and the EMI interference is quite serious, and the switching frequency of 350KHz makes the radiation problem almost impossible to solve, and can only be solved by putting the whole power supply into the metal shell of the street lamp, to sum up, the shortcomings of the BUCK circuit are as follows: the cost is high, the circuit is complex, the efficiency is low, the EMI problem is serious, and a new scheme is adopted.
SUMMERY OF THE UTILITY MODEL
Solves the technical problem
To the above-mentioned shortcoming that prior art exists, the utility model provides a constant current output control system can solve the current BUCK circuit of being applied to the constant current output circuit of illumination charging system's inefficiency, with high costs, the circuit is complicated, the serious problem of EMI problem effectively.
Technical scheme
In order to achieve the above purpose, the utility model discloses a following technical scheme realizes:
a constant current output control system comprising: a first power supply, a voltage stabilizing module, an eighth resistor R8, a first transistor M1, a third resistor R3, a fifth resistor R5, a control module, a thirty-fourth resistor R34, an eleventh resistor R11, a voltage monitoring module, and a first diode D1, wherein the anode of the first power supply is connected with the input end of the voltage stabilizing module, the output end of the voltage stabilizing module is connected with the gate of the first transistor M1 through the eighth resistor R8, the source of the first transistor M1 is connected with the cathode of the first power supply through the third resistor R3, the source of the first transistor M1 is connected with the input end of the control module through the fifth resistor R5, the output end of the control module is connected with the gate of the first transistor M1 through the thirty-fourth resistor R34, the drain of the first transistor M1 is connected with the input end of the voltage monitoring module through the eleventh resistor R11, the output end of the voltage detecting module is connected with the optical coupling element through the first diode D1, the anode of the first power source is connected to the anode of the load, and the connection point of the eleventh resistor R11 and the first transistor M1 is connected to the cathode of the load.
Furthermore, the voltage stabilizing module comprises a first resistor R1, a second resistor R2, a first triode Q1, a second power supply, a first voltage regulator tube Z1 and a first capacitor C1, wherein the base of the first triode Q1 is connected with the positive electrode of the first power supply through the first resistor R1, the emitter of the first triode Q1 is connected with the positive electrode of the first power supply through the second resistor R2, the cathode of the first voltage regulator tube Z1 is connected with the base of the first triode Q1, the anode of the first voltage regulator tube Z1 is grounded through a third dodecaresistor R32, the emitter of the first triode Q1 is connected with the gate of the first transistor M1 through an eighth resistor R8, one end of the first capacitor C1 is connected with the emitter of the first triode Q1, the other end of the first capacitor C1 is grounded, and the emitter of the first triode 1 is the output terminal of the voltage stabilizing module.
Furthermore, the control module comprises a first operational amplifier a, a seventh resistor R7, a second capacitor C2, a fourth resistor R4, a sixth resistor R6 and a seventeenth resistor R17, the seventh resistor R7 is connected in series with the second capacitor C2, the non-series end of the second capacitor C2 is connected with the inverting end of the first operational amplifier a, the non-series end of the seventh resistor R7 is connected with the output end of the first operational amplifier a, the inverting end of the first operational amplifier a is connected with the source of the first transistor M1 through a fifth resistor R5, the non-series end of the first operational amplifier a is connected with one end of the fourth resistor R4, one end of the sixth resistor R6 and one end of the seventeenth resistor R17, the other end of the fourth resistor R4 is grounded, the other ends of the sixth resistor R6 and the seventeenth resistor R17 are connected with the second power supply through a gate of the first operational amplifier a fourteenth resistor R34 and a gate of the first operational amplifier a fourteenth transistor M1, the inverting terminal of the first operational amplifier A is the input terminal of the control module, and the output terminal of the first operational amplifier A is the output terminal of the control module.
Furthermore, the voltage monitoring module includes a second operational amplifier B, a sixteenth resistor R16, a thirteenth resistor R13, a fourteenth resistor R14, a third capacitor C3, a twelfth resistor R12, and a second voltage regulator tube Z2, a drain of the first transistor M1 is connected to an inverting terminal of the second operational amplifier B through an eleventh resistor R11, an output terminal of the second operational amplifier B is connected to the optical coupler element through a first diode D1, an inverting terminal of the second operational amplifier B is connected to the second power supply through a sixteenth resistor R16 and a thirteenth resistor R13 connected in parallel, a fourteenth resistor R14 is connected in series to the third capacitor C3, a non-series terminal of the third capacitor C3 is connected to the inverting terminal of the second operational amplifier B, a non-series terminal of the fourteenth resistor R14 is connected to the output terminal of the second operational amplifier B, one end of the twelfth resistor R12 is connected to the inverting terminal of the second operational amplifier B, the cathode of the second voltage-regulator tube Z2 is connected with the series connection point of the inverting end of the second operational amplifier B and the eleventh resistor R11, the other end of the twelfth resistor R12 and the anode of the second voltage-regulator tube Z2 are grounded, the inverting end of the second operational amplifier B is the input end of the voltage monitoring module, and the output end of the second operational amplifier B is the output end of the voltage monitoring module.
Furthermore, the voltage regulator further includes a tenth resistor R10, a fifteenth resistor R15, a thirty-sixth resistor R36, a thirty-seventh resistor R37, a second transistor M2, a thirty-third resistor R33, and a ninth resistor R9, two ends of the fifteenth resistor R15 are respectively connected to two ends of a source and a drain of the first transistor M1, a drain of the second transistor M2 is connected to a gate of the first transistor M1, a gate of the second transistor M2 is connected to a source of the first transistor M1 through a thirty-sixteenth resistor 36, two ends of the tenth resistor R10 are respectively connected to the gate and the source of the first transistor M2, two ends of the thirty-seventh resistor R37 are respectively connected to the gate and the source of the second transistor M2, one end of the ninth resistor R9 is connected to the second power supply, the other end of the ninth resistor R9 is connected to an output terminal of the voltage regulator module, and two ends of the thirty-third resistor R33 are grounded.
Furthermore, the third resistor R3 is a constant current detection resistor.
Furthermore, the first transistor M1 is an N-type MOS transistor.
Furthermore, the first operational amplifier a is an LM2904 chip.
Further, the first power supply is 36V.
Advantageous effects
Adopt the utility model provides a technical scheme compares with known public technique, has following beneficial effect:
1. the utility model discloses with first power through first triode Q1 and stabilivolt Z1, resistance R1, R2 carry on after the steady voltage produce voltage about 15V, through resistance R8 drive transistor M1 simultaneously, transistor M1 switches on, if OUT1+, OUT 1-connect the LED load, then have the electric current to flow through the LED load through transistor M1, resistance R3 to the negative pole of first power, form complete return circuit; when current flows through the resistor R3, voltage is generated on the resistor R3, the current is sent to the inverting terminal of the first operational amplifier A through the resistor R5 and is compared with a reference voltage from regulated 15V after voltage division through the resistor R6 and the resistor R4, the output terminal of the first operational amplifier A controls the grid of the transistor M1, the voltage of the conduction voltage drop Vds of the transistor M1 is controlled to change to achieve the effect of voltage division of load voltage, so that the LED load current is kept constant, a voltage monitoring signal is added to the drain electrode of the transistor M1 and is sent to an optical coupling element to control the primary working frequency to adjust the output voltage of the constant current control system, if the conduction voltage drop Vds of the transistor M1 rises, the voltage of the inverting terminal of the second operational amplifier B rises through the resistor R11, and when the inverting terminal of the second operational amplifier B exceeds the inverting terminal, the output terminal of the second operational amplifier outputs low potential for pulling, the output voltage is reduced, so that the Vds is reduced after the LED load, the Vds is maintained unchanged, and the control purpose is achieved; through the opto-coupler element end that feeds back to primary limit is got to the monitoring adjustment signal for no matter how the load changes, the voltage on transistor M1 can follow this change and feed back to primary limit for the voltage drop of transistor M1 can not exceed the value of injecing, thereby realizes the function of constant current, and the circuit structure of this system is simple simultaneously, with low costs, and is efficient, and does not have EMI interference problem.
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 invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
Fig. 1 is a schematic diagram of a conventional constant current output control system;
fig. 2 is a circuit diagram of a constant current output control system according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings in the embodiments of the present invention are combined below to clearly and completely describe the technical solutions in the embodiments of the present invention. It is to be understood that the embodiments described are only some of the embodiments of the present invention, and not all of them. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
The present invention will be further described with reference to the following examples.
Examples
As shown in fig. 2, a constant current output control system includes: the LED driving circuit comprises a first power source Vf, a voltage stabilizing module, a resistor R8, a transistor M1, a resistor R3, a resistor R5, a control module, a resistor R34, a resistor R11, a voltage monitoring module and a diode D1, wherein a positive pole Vf + of the power source is connected with an input end of the voltage stabilizing module, an output end of the voltage stabilizing module is connected with a grid G of a transistor M1 through a resistor R8, a source S of the transistor M1 is connected with a negative pole Vf of the power source through a resistor R3, a source S of a transistor M1 is connected with an input end of the control module through a resistor R5, an output end of the control module is connected with a grid G of a transistor M1 through a resistor R34, a drain D of a transistor M1 is connected with an input end of the voltage monitoring module through a resistor R11, an output end of the voltage detecting module is connected with an optical coupling element P through a diode D1, a positive pole Vf + of the power source is connected with a positive pole of, wherein the coupling element P corresponds to the primary side of the constant current control system.
Specifically, the voltage stabilizing module comprises a resistor R1, a resistor R2, a triode Q1, a second power supply, a voltage stabilizing tube Z1 and a capacitor C1, wherein the base electrode of the triode Q1 is connected with the positive electrode Vf + of the power supply through a resistor R1, the emitter electrode of the triode Q1 is connected with the positive electrode Vf + of the power supply through a resistor R2, the cathode of the voltage stabilizing tube Z1 is connected with the base electrode of the triode Q1, the anode of the voltage stabilizing tube Z1 is grounded through a resistor R32, the emitter electrode of the triode Q1 is connected with the gate G of the transistor M1 through a resistor R8, one end of the capacitor C1 is connected with the emitter electrode of the triode Q1, the other end of the capacitor C1 is grounded, and the emitter electrode of the triode Q1 is the.
The control module comprises an operational amplifier A, a resistor R7, a capacitor C2, a resistor R4, a resistor R6 and a resistor R17, wherein the resistor R7 is connected with a capacitor C2 in series, the non-series end of the capacitor C2 is connected with the inverting end of the operational amplifier A, the non-series end of the resistor R7 is connected with the output end of the operational amplifier A, the inverting end of the operational amplifier A is connected with the source S of the transistor M1 through a resistor R5, the non-series end of the operational amplifier A is connected with one end of the resistor R4, one end of the resistor R6 and one end of the resistor R17, the other end of the resistor R4 is grounded, the other ends of the resistor R6 and the resistor R17 are connected with a second power supply through a resistor R34, the output end of the operational amplifier A is connected with the gate of the transistor M1 through the resistor R34, the inverting end of the operational amplifier A is the input end of. Wherein the second power supply is 2.5V.
The voltage monitoring module comprises an operational amplifier B, a resistor R16, a resistor R13, a resistor R14, a capacitor C3, a resistor R12 and a voltage regulator tube Z2, the drain of a transistor M1 is connected with the inverting terminal of the operational amplifier B through a resistor R11, the output terminal of the operational amplifier B is connected with an optical coupling element P through a diode D1, the inverting terminal of the operational amplifier B is connected with a second power supply through a resistor R16 and a resistor R13 which are connected in parallel, a resistor R14 is connected with the capacitor C3 in series, the non-series terminal of a capacitor C3 is connected with the inverting terminal of the operational amplifier B, the non-series terminal of the resistor R14 is connected with the output terminal of the operational amplifier B, one end of the resistor R12 is connected with the inverting terminal of the operational amplifier B, the cathode of the voltage regulator tube Z2 is connected with the inverting terminal of the operational amplifier B and the series point of the resistor R11, the other end of the resistor R12 and the anode of the voltage regulator tube Z2 are grounded, the output end of the operational amplifier B is the output end of the voltage monitoring module.
The voltage stabilizing module further comprises a resistor R10, a resistor R15, a resistor R36, a resistor R37, a transistor M2, a resistor R33 and a resistor R9, two ends of the resistor R15 are respectively connected with two ends of a source and a drain of the transistor M1, a drain of the transistor M2 is connected with a gate of the transistor M1, a gate of the transistor M2 is connected with a source of the transistor M1 through the resistor 36, two ends of the resistor R10 are respectively connected with a gate and a source of the transistor M1, two ends of the resistor R37 are respectively connected with a gate and a source of the transistor M2, one end of the resistor R9 is connected with the second power supply, the other end of the resistor R9 is connected with an output end of the voltage stabilizing module, and two ends of the resistor R.
The resistor R3 is a constant current detection resistor, the transistor M1 is an N-type MOS (metal oxide semiconductor) transistor, the operational amplifier A and the operational amplifier B are LM2904 chips, the power Vf is 36V, and the second power is 2.5V.
The specific working principle is as follows: the power Vf is regulated by a triode Q1, a voltage regulator Z1, a resistor R1 and a resistor R2 to generate a voltage of about 15V, meanwhile, a transistor M1 is driven by the resistor R8, the transistor M1 is conducted, and if OUT1+ and OUT1 are connected with an LED load, current flows through the LED load to the negative electrode Vf-of the power through a transistor M1 and a resistor R3 to form a complete loop; when current flows through a resistor R3, voltage is generated on a resistor R3, the current is sent to the inverting terminal of an operational amplifier A through a resistor R5 and is compared with a reference voltage from regulated 15V after voltage division through a resistor R6 and a resistor R4, the output terminal of the operational amplifier A controls the grid of a transistor M1, the voltage of conduction voltage drop Vds of a transistor M1 is changed through control to play a role of dividing the load voltage, so that the LED load current is kept constant, a voltage monitoring signal is added to the drain electrode of the transistor M1 and is sent to an optical coupler element to control primary working frequency to adjust the output voltage of a constant current control system, if the conduction voltage drop of the transistor M1 rises by Vds, the voltage of the Vds enables the inverting terminal voltage of the operational amplifier B to rise through a resistor R11, and when the inverting terminal of the operational amplifier exceeds the inverting terminal, the output terminal of the operational amplifier B outputs low potential to pull the optical coupler to reduce the output voltage, vds is reduced after the LED load is passed, so that Vds is kept unchanged, and the control purpose is achieved; through the opto-coupler element end that feeds back to primary limit is got to the monitoring adjustment signal for no matter how the load changes, the voltage on transistor M1 can follow this change and feed back to primary limit for the voltage drop of transistor M1 can not exceed the value of injecing, thereby realizes the function of constant current, and the circuit structure of this system is simple simultaneously, with low costs, and is efficient, and does not have EMI interference problem.
The input voltage is 100V-240V, the power factor requirement is 0.95, the two paths output 31V 3A, the input 230V rated load efficiency is more than 90%, and the safety requirement of the lighting technology is met. By adopting a new scheme, under the input condition of 115V, the total efficiency is close to 90 percent; and the light efficiency is good, and the constant current characteristic is less influenced by temperature.
The constant current control system can control multi-path constant current output, a double-tube forward working mode is adopted for DC conversion, a magnetic amplification technology or a synchronous switch tube is inserted in front of an energy storage inductor, a feedback signal of a transistor is used for directly controlling an operational amplifier or the synchronous switch tube, multi-path constant current control can be realized, other resistors are added at the output end of a voltage stabilizing module to drive a transistor control module, and the feedback signal is fed back to a coupling element P through a voltage monitoring module, namely fed back to the primary side of a constant current circuit, wherein the double-tube forward working mode is adopted for DC conversion, and discrete influence of loads can not be received.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (9)
1. A constant current output control system, comprising: a first power supply, a voltage stabilizing module, an eighth resistor R8, a first transistor M1, a third resistor R3, a fifth resistor R5, a control module, a thirty-fourth resistor R34, an eleventh resistor R11, a voltage monitoring module, and a first diode D1, wherein the anode of the first power supply is connected with the input end of the voltage stabilizing module, the output end of the voltage stabilizing module is connected with the gate of the first transistor M1 through the eighth resistor R8, the source of the first transistor M1 is connected with the cathode of the first power supply through the third resistor R3, the source of the first transistor M1 is connected with the input end of the control module through the fifth resistor R5, the output end of the control module is connected with the gate of the first transistor M1 through the thirty-fourth resistor R34, the drain of the first transistor M1 is connected with the input end of the voltage monitoring module through the eleventh resistor R11, the output end of the voltage detecting module is connected with the optical coupling element through the first diode D1, the anode of the first power source is connected to the anode of the load, and the connection point of the eleventh resistor R11 and the first transistor M1 is connected to the cathode of the load.
2. The constant current output control system as claimed in claim 1, wherein the voltage stabilizing module comprises a first resistor R1, a second resistor R2, a first triode Q1, a second power supply, a first voltage regulator tube Z1, a first capacitor C1, a base of the first triode Q1 is connected with an anode of the first power supply through the first resistor R1, an emitter of the first triode Q1 is connected with an anode of the first power supply through the second resistor R2, a cathode of the first voltage regulator tube Z1 is connected with a base of the first triode Q1, an anode of the first voltage regulator tube Z1 is grounded through a third twelve resistor R32, an emitter of the first triode Q1 is connected with a gate of the first transistor M1 through an eighth resistor R8, one end of the first capacitor C1 is connected to an emitter of the first transistor Q1, the other end of the first capacitor C1 is grounded, and the emitter of the first transistor Q1 is an output end of the regulator module.
3. The constant current output control system according to claim 1, wherein the control module comprises a first operational amplifier a, a seventh resistor R7, a second capacitor C2, a fourth resistor R4, a sixth resistor R6 and a seventeenth resistor R17, the seventh resistor R7 is connected in series with the second capacitor C2, the non-series end of the second capacitor C2 is connected with the inverting end of the first operational amplifier a, the non-series end of the seventh resistor R7 is connected with the output end of the first operational amplifier a, the inverting end of the first operational amplifier a is connected with the source of the first transistor M1 through a fifth resistor R5, the non-series end of the first operational amplifier a is connected with one end of the fourth resistor R48, one end of the sixth resistor R6 and one end of the seventeenth resistor R17, the other end of the fourth resistor R632 is grounded, the other ends of the sixth resistor R6 and the seventeenth resistor R17 are connected with the gate of the first operational amplifier M1 through a second resistor R68692, and the output end of the first operational amplifier R1 is connected with the gate of the first operational amplifier M The inverting terminal of the first operational amplifier a is the input terminal of the control module, and the output terminal of the first operational amplifier a is the output terminal of the control module.
4. The constant current output control system as claimed in claim 1, wherein the voltage monitoring module comprises a second operational amplifier B, a sixteenth resistor R16, a thirteenth resistor R13, a fourteenth resistor R14, a third capacitor C3, a twelfth resistor R12, and a second voltage regulator Z2, the drain of the first transistor M1 is connected with the inverting terminal of the second operational amplifier B through an eleventh resistor R11, the output terminal of the second operational amplifier B is connected with the optical coupling element through a first diode D1, the non-series terminal of the second operational amplifier B is connected with the output terminal of the second operational amplifier B through a sixteenth resistor R16 and a thirteenth resistor R13 which are connected in parallel, a fourteenth resistor R14 is connected with the third capacitor C3 in series, the non-series terminal of the third capacitor C3 is connected with the inverting terminal of the second operational amplifier B, the non-series terminal of the fourteenth resistor R14 is connected with the output terminal of the second operational amplifier B, one end of the twelfth resistor R12 is connected with the non-series terminal of the inverting terminal of the second operational amplifier B, the cathode of the second voltage-regulator tube Z2 is connected with the series connection point of the inverting end of the second operational amplifier B and the eleventh resistor R11, the other end of the twelfth resistor R12 and the anode of the second voltage-regulator tube Z2 are grounded, the inverting end of the second operational amplifier B is the input end of the voltage monitoring module, and the output end of the second operational amplifier B is the output end of the voltage monitoring module.
5. The constant current output control system according to claim 1, further comprising a tenth resistor R10, a fifteenth resistor R15, a thirty-sixth resistor R36, a thirty-seventh resistor R37, a second transistor M2, two ends of a thirty-third resistor R33, a ninth resistor R9 and a fifteenth resistor R15 are respectively connected with two ends of a source and a drain of the first transistor M1, a drain of the second transistor M2 is connected with a gate of the first transistor M1, a gate of the second transistor M2 is connected with a source of the first transistor M1 through a thirty-sixth resistor 36, two ends of the tenth resistor R10 are respectively connected with a gate and a source of the first transistor, two ends of a thirty-seventh resistor R37 are respectively connected with a gate and a source of the second transistor M2, one end of the ninth resistor R9 is connected with the second power supply, the other end of the ninth resistor R9 is connected with an output end of the voltage stabilizing module, and two ends of the thirty-third resistor R33 are grounded.
6. The constant current output control system according to claim 1, wherein the third resistor R3 is a constant current detection resistor.
7. The constant-current output control system according to claim 1, wherein the first transistor M1 is an N-type MOS transistor.
8. The constant-current output control system according to claim 3, wherein the first operational amplifier A is an LM2904 chip.
9. A constant current output control system according to claim 1, wherein the first power supply is 36V.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020419177.6U CN211557577U (en) | 2020-03-27 | 2020-03-27 | Constant current output control system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020419177.6U CN211557577U (en) | 2020-03-27 | 2020-03-27 | Constant current output control system |
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| CN211557577U true CN211557577U (en) | 2020-09-22 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113453405A (en) * | 2021-07-16 | 2021-09-28 | 芯知微(上海)电子科技有限公司 | LED drive circuit and LED lamp |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113453405A (en) * | 2021-07-16 | 2021-09-28 | 芯知微(上海)电子科技有限公司 | LED drive circuit and LED lamp |
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Effective date of registration: 20221228 Address after: No. 225, Wuqing West 3rd Road, Wuhou District, Chengdu, Sichuan 610000 Patentee after: Chengdu Fangong Technology Co.,Ltd. Address before: 518000 1708, Development Center Building, No. 2010, Renmin South Road, Luohu Community, Nanhu Street, Luohu District, Shenzhen, Guangdong Patentee before: SHENZHEN LANSE QIYUAN DEVELOPMENT Co.,Ltd. |
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Granted publication date: 20200922 |