CN212183769U - LED power supply current linear steady-state increasing circuit - Google Patents

LED power supply current linear steady-state increasing circuit Download PDF

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CN212183769U
CN212183769U CN202021338627.5U CN202021338627U CN212183769U CN 212183769 U CN212183769 U CN 212183769U CN 202021338627 U CN202021338627 U CN 202021338627U CN 212183769 U CN212183769 U CN 212183769U
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power supply
current
circuit
led
resistor
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邓建伟
孔令潮
程雪玲
袁光志
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Foshan Nanhai Hongba Electronics Co ltd
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Abstract

The utility model discloses a linear steady increase circuit of LED power supply current, which comprises a power supply unit and a linear constant current control unit, wherein the power supply unit is used for supplying power to the linear constant current control unit; the linear constant current control unit comprises a signal voltage control circuit and a constant current output circuit, wherein the signal voltage control circuit outputs a voltage signal for controlling the current of the LED load D2; the constant current output circuit is used for linearly controlling the current of an LED load D2 and comprises a triode Q1 and a triode Q2, and two ends of the LED load D2 are respectively connected to collectors of a triode Q1 and a triode Q2. The utility model discloses a triode work is in the region of amplification, and the size of collector current only receives the principle of the influence of base current size, converts the LED current control of collecting electrode into the current control of base, realizes that LED supply current's linearity is steady to be increased.

Description

LED power supply current linear steady-state increasing circuit
Technical Field
The utility model relates to a LED power field, concretely relates to LED power supply current linear steady increase circuit.
Background
The LED is widely applied to the fields of illumination, display and the like due to the characteristics of energy conservation, high efficiency, low cost, small volume, high brightness and the like. When the LED is used, the brightness of the LED is required to be changed according to different environments and different requirements. The brightness of the LED is mainly determined by current, and within a certain range, the brightness of the LED and the current are in a linear relationship. Therefore, by accurately controlling the current, the brightness of the LED can be accurately adjusted
The traditional method for adjusting the brightness of the LED through the current is to connect a potentiometer in parallel to a sampling resistor of a main circuit, and change the magnitude of the current by changing the resistance of the potentiometer. However, the resistance value of the sampling resistor is often small, and the resistance value is not easy to control, so that the current adjusting range is small, and the adjusting precision is low.
In order to solve the above problems, the prior art has been improved by a few people in the art, and patent CN207460563U proposes an LED analog dimming circuit, in which the current is changed by adjusting the resistance of a resistor, so as to change the brightness of an LED. However, the method has the advantages of simple circuit and low cost, but the adjustment precision is low, and the linear adjustment cannot be realized.
Patent CN202634821U proposes a current-adjustable LED driving power supply, which changes the current reference voltage by adjusting a potentiometer, so as to change the voltage across the resistor, and finally achieve the purpose of adjusting the current.
The method has the disadvantages of low precision, high cost and complex circuit, and cannot realize linear adjustment of the current of the LED.
Therefore, the existing LED power supply needs to be further improved, the problem of linear adjustment of LED current is solved, high-precision and linear LED current control is realized, and high-precision and linear LED brightness control is further realized.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a LED power supply current linear steady increase circuit of high accuracy, linear current control.
In order to achieve the purpose, the utility model adopts the following technical scheme: the LED power supply current linear stabilizing and increasing circuit comprises a power supply unit and a linear constant current control unit, wherein the power supply unit is used for supplying power to the linear constant current control unit; the linear constant current control unit comprises a signal voltage control circuit and a constant current output circuit, wherein:
the signal voltage control circuit is connected with the constant current output circuit through an electric signal, the signal voltage control circuit comprises a voltage reduction and voltage stabilization circuit, and the direct current power supply outputs a voltage signal for controlling the current of the LED load D2 after passing through the voltage reduction and voltage stabilization circuit;
the constant current output circuit is used for linearly controlling the current of an LED load D2 and comprises a triode Q1 and a triode Q2, two ends of the LED load D2 are respectively connected to collectors of a triode Q1 and a triode Q2, and an emitter of the Q2 is connected with a potentiometer RP 2.
Preferably, the voltage reduction and stabilization circuit comprises a chip LM317, a capacitor C1, a capacitor C2, a resistor R1 and a potentiometer RP1, wherein the capacitors C1 and C2 are connected in parallel and then connected with a pin 1 of the LM 317; the resistor R1 is connected between pin 2 and pin 3 of the LM 317; one end of the potentiometer RP1 is connected with the pin 2 of the LM317, and the other end is connected with the resistor R1; and the pin 3 of the LM317 is connected with the constant current output circuit.
Preferably, the voltage U output by the LM317 pin 3OThe relationship between the resistor R1 and the potentiometer RP1 is:
Figure BDA0002577551490000021
wherein R isp1Is the resistance, R, of potentiometer RP11Is the resistance of resistor R1.
Preferably, the constant current output circuit further comprises an operational amplifier U1A and an operational amplifier U1B, the LM317 pin 3 is connected with the non-inverting input terminal of the operational amplifier U1A, the output terminal of the operational amplifier U1A is connected with the base of a triode Q1, the collector of the triode Q1 is connected with a positive direct current power supply, and the emitter is connected with the base of a triode Q2; the emitter of the triode Q2 is connected with the inverting input end of the operational amplifier U1B and the potentiometer RP2, the other end of the potentiometer RP2 is grounded and connected with the resistor R3, the other end of the resistor R3 is connected with the non-inverting input end of the operational amplifier U1B and the resistor R2, and the resistor R2 is connected with the output end of the operational amplifier U1B and then connected with the inverting input end of the channel of the operational amplifier U1A.
Preferably, the operational amplifier U1A and the operational amplifier U1B are LM358 amplifiers.
Preferably, the current flowing through LED load D2 is as follows:
Figure BDA0002577551490000031
wherein R isp2Is the resistance, R, of potentiometer RP22Is the resistance of resistor R2, R3Is the resistance of resistor R3.
Preferably, the power supply unit is powered by a +15V direct current power supply single power supply.
Preferably, the power supply unit comprises a MAX766 chip, and the MAX766 chip is used for converting a +15V voltage into a-15V voltage to supply negative electricity to the operational amplifiers U1A and U1B.
Has the advantages that:
1. the utility model realizes the linear control of the voltage signal by utilizing the voltage reduction and voltage stabilization circuit, thereby realizing the linear control of the LED power supply current, and having good linear control effect and high precision;
2. the utility model discloses a triode work is in the region of amplification, and the size of collector current only receives the principle of the influence of base current size, converts the LED current control of collecting electrode into the current control of base, and the rethread realizes the linear control to the electric current to the linear control of voltage to realize that the linearity of LED supply current steadily increases.
Drawings
Fig. 1 is a schematic diagram of the signal voltage control circuit in the linear steady increase circuit of the LED power supply current.
Fig. 2 is a schematic diagram of a constant current output circuit in the linear steady-state increasing circuit of the LED power supply current.
Fig. 3 is an electronic circuit schematic diagram of the power supply unit in the LED power supply current linear steady-state circuit of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments, but the scope of the present invention is not limited to the following specific embodiments.
As shown in fig. 1 to 3, the LED power supply current linear stabilizing circuit includes a power supply unit and a linear constant current control unit, where the power supply unit is used to supply power to the linear constant current control unit; the linear constant current control unit comprises a signal voltage control circuit and a constant current output circuit, wherein:
the signal voltage control circuit is connected with the constant current output circuit through an electric signal, the signal voltage control circuit comprises a voltage reduction and voltage stabilization circuit, and the direct current power supply outputs a voltage signal for controlling the current of an LED load D2 (hereinafter referred to as LED) after passing through the voltage reduction and voltage stabilization circuit;
referring to fig. 1, the voltage reduction and stabilization circuit includes a chip LM317(LM317 is an adjustable 3-terminal positive voltage regulator, which can provide a current exceeding 1.5 amperes in an output voltage range of 1.2 volts to 37 volts), a capacitor C1, a capacitor C2, a resistor R1, and a potentiometer RP1 (the potentiometer is one of variable resistors, and generally consists of a resistor body and a rotating or sliding system, i.e., a movable contact moves on the resistor body to obtain a partial voltage output), where the capacitors C1 and C2 are connected in parallel and then connected to pin 1 of LM 317; the resistor R1 is connected between pin 2 and pin 3 of the LM 317; one end of the potentiometer RP1 is connected with the pin 2 of the LM317, and the other end is connected with the resistor R1; and the pin 3 of the LM317 is connected with the constant current output circuit. After the 15V direct-current power supply passes through a voltage reduction and stabilization circuit composed of an LM317, a resistor, a capacitor, a potentiometer and the like, the output voltage is used as a voltage signal for controlling the current of the LED, and the linear control of the output voltage is realized by adjusting the resistance of the potentiometer.
Referring to fig. 2, the constant current output circuit is used for linearly controlling the current of an LED load D2, and includes a transistor Q1 and a transistor Q2, two ends of the LED load D2 are respectively connected to collectors of a transistor Q1 and a transistor Q2, and an emitter of the Q2 is connected to a potentiometer RP 2.
Specifically, the constant current output circuit further comprises an operational amplifier U1A and an operational amplifier U1B (hereinafter referred to as operational amplifier a and operational amplifier B), and the operational amplifier U1A and the operational amplifier U1B adopt an LM358 operational amplifier (LM358 is a dual operational amplifier); the LM317 pin 3 is connected with the positive phase input end of an operational amplifier U1A, the output end of the operational amplifier U1A is connected with the base electrode of a triode Q1, the collector electrode of the triode Q1 is connected with a positive direct current power supply, and the emitter electrode is connected with the base electrode of a triode Q2; the emitter of the triode Q2 is connected with the inverting input end of the operational amplifier U1B and the potentiometer RP2, the other end of the potentiometer RP2 is grounded and connected with the resistor R3, the other end of the resistor R3 is connected with the non-inverting input end of the operational amplifier U1B and the resistor R2, and the resistor R2 is connected with the output end of the operational amplifier U1B and then connected with the inverting input end of the channel of the operational amplifier U1A. The triode Q1 works in the amplifying region and adopts the connection method of a common collector amplifying circuit, the current of the emitter is 1+ beta times of the current of the base electrode, and the effect of current amplification is achieved. The current amplified by the triode Q1 flows to the base electrode of the triode Q2, the triode Q2 works in an amplifying region, the connection method of a common collector amplifying circuit is adopted, and the current of a collector almost only depends on the current of the base electrode and is beta times of the current of the base electrode. Within a certain range, the change of the resistance of the collector of the triode Q2 does not influence the change of the current, the current of the collector is only influenced by the base current, and the effect of constant current of the load can be realized only by keeping the base current unchanged. Therefore, the LED is connected with the collector of the triode, and the current of the collector can be linearly controlled only by linearly controlling the current of the base of the triode Q2, so that the linear control of the LED current is realized.
Referring to fig. 3, the power supply unit is powered by a +15V dc power supply single power supply, and the 15V dc power supply can directly supply positive power to the operational amplifier and reverse-bias the collector of the triode. Meanwhile, the power supply unit comprises a MAX766 chip (MAX766 is a reverse polarity switching regulator manufactured by Meixin corporation), and a 15V direct-current power supply forms a-15V voltage after passing through a DC-DC conversion circuit controlled by the MAX766 to provide negative electricity for the operational amplifiers U1A and U1B.
The circuit principle of the utility model is as follows:
generation of negative voltage
The positive voltage of the 15V DC power supply flows through a DC-DC conversion circuit composed of MAX766 and the like, and then the output voltage is-15V. The input voltage of the MAX766 is 3V to 16V, and the output voltage is-14.4V to-16.6V. The input voltage can be directly provided by a 15V direct-current power supply, and the output voltage meets the requirement of negative-voltage power supply of the operational amplifier.
Implementation of a linear control voltage signal
After the 15V direct-current power supply passes through a voltage reduction and stabilization circuit composed of an LM317 and the like, the output voltage is used as a voltage signal for controlling the current of the LED, and the output voltage is controlled by adjusting the resistance of a potentiometer. Output voltage UOThe relation between the resistance R1 and the resistance RP1 of the resistor RP1 access circuit is as follows:
Figure BDA0002577551490000061
wherein, UREFRepresents the reference voltage, U, of LM317REFBetween 1.2V and 1.3V, generally 1.25V; i isAJDRepresents the regulated current, I, of LM317AJDLess than 100 muA; rp1Is the resistance, R, of potentiometer RP11Is the resistance of resistor R1 when RP1When not particularly large, I is often ignoredAJD*RP1The size of (2). Thus the output voltage UOThe relation between the resistance R1 and the resistance RP1 of the resistor RP1 access circuit is as follows:
Figure BDA0002577551490000062
Rp2is the resistance, R, of potentiometer RP22Is the resistance of resistor R2, R3Is the resistance of resistor R3.
Implementation of constant current
The transistors Q1 and Q2 work in an amplifying area by adopting the connection method of a common collector amplifying circuit. The triode Q1 plays a role in current amplification, and the load capacity of the circuit is improved. The base current signal is amplified by 1+ beta times by Q1 and then is connected to the base of the triode Q2. The LED load D2 is connected at the collector of the triode Q2, because the triode Q2 works in the amplification region, the collector current is not influenced by the LED within a certain range, and the collector current is only related to the base current, so as long as the base current is controlled to be unchanged, the collector current is unchanged, and the current flowing through the LED is unchanged, thereby realizing constant current.
Principle of current control
After the output circuit is controlled by the linear voltage, the voltage U is outputOThe positive phase input end and the negative phase input end of the operational amplifier A are virtually short-circuited, so that the operational amplifier A is connected with the power supply
Figure BDA0002577551490000071
UANFor the inverse voltage of the operational amplifier A, UAPIs the positive phase voltage of the operational amplifier a. The inverting input terminal of the operational amplifier A is connected with R2, R2 is connected with R3 and the non-inverting input terminal of the operational amplifier B, and R3 is grounded, so that:
Figure BDA0002577551490000072
wherein, UBPRepresenting the positive phase voltage, U, of the operational amplifier BR3Representing the voltage across resistor R3.
And because the positive phase input end and the negative phase input end of the operational amplifier B are virtually short-circuited, the following steps are carried out:
Figure BDA0002577551490000073
wherein, UBNRepresenting the reverse phase voltage of the op-amp B.
The inverting input terminal of the operational amplifier B is connected with the RP2, and the other end of the RP2 is grounded, so that:
Figure BDA0002577551490000074
wherein, URP2Representing the value of the voltage across the potentiometer RP 2.
Current flowing through potentiometer RP 2:
Figure BDA0002577551490000075
one end of the potentiometer RP2 is connected to the emitter of the transistor Q2, so the emitter current:
Figure BDA0002577551490000076
wherein, I2eRepresenting the current value, I, in the reflector of transistor Q22bRepresenting the current value, I, in the base of a transistor Q22cRepresenting the current value in the collector of transistor Q2.
The collector current is then:
Figure BDA0002577551490000081
because of the base current I2bIs generally much smaller than the collector current I2eTherefore, can be approximately considered
Figure BDA0002577551490000082
Then:
Figure BDA0002577551490000083
when the input voltage changes, the emitter current of the transistor Q2I2eWill also vary linearly, the collector current I2cA linear change will also occur. Thereby achieving linear control of the current through the LED. The current flowing through the LED is:
Figure BDA0002577551490000084
wherein R isp2Is the resistance, R, of potentiometer RP22Is the resistance of resistor R2, R3Is the resistance value of the resistor R3.
Therefore, within a certain range, as long as R1, R2, R3, RP1、RP2It is determined that the current flowing through the LED is also determined. When R1, R2, R3 and RP2At a certain time, output current IOAnd a resistor RP1In a linear relationship, the output current can be linearly controlled by changing the resistance of the potentiometer RP1 connected into the circuit. Through the pairs of R1, R2, R3 and RP1、RP2The range of the current flowing through the LED can be adjusted by reasonable matching. The invention adopts two potentiometers to adjust the current, linear adjustment is carried out through RP1, nonlinear adjustment is carried out through RP2, and the current size and range can be flexibly adjusted by matching with the resistance values of R1, R2 and R3, so that the invention has higher flexibility and stronger applicability.
Generally speaking, compared with the prior art, the utility model, the advantage is as follows:
the LED current control of the collector is converted into the current control of the base by adopting the principle that the triode works in an amplification region and the size of the collector current is only influenced by the size of the base current, and then the linear control of the current is realized by the linear control of the voltage, so that the linear stable increase of the LED power supply current is realized.
Linear control of the voltage signal is achieved through the LM317, linear control of the LED power supply current is achieved, the linear control effect is good, and the accuracy is high.
The direct-current power supply can directly supply power to the LED, the triode is enabled to be reversely biased, positive power is supplied to the operational amplifier, negative power is supplied to the operational amplifier through MAX766, voltage signals for controlling LED current are converted through LM317, the direct-current power supply is multifunctional, power cost is saved, influence of power factors is small, and applicability is strong.
By utilizing the operating characteristics of the operational amplifier, the current of the LED can be linearly controlled, and in addition, the voltage distribution condition can be changed through the resistance values of the resistors R2 and R3, and the magnitude of the current can be changed through changing the resistance value of the resistor RP2, so that the nonlinear adjustment is carried out. By utilizing various adjusting modes, the LED current can be regulated and controlled in multiple stages, the adjusting range of the LED current is enlarged, the LED current is adjusted according to actual requirements, and the flexibility and the adaptability of the circuit are enhanced.
Variations and modifications to the above-described embodiments may occur to those skilled in the art, in light of the above teachings and teachings. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the present invention should fall within the protection scope of the claims of the present invention. In addition, although specific terms are used in the specification, the terms are used for convenience of description and do not limit the utility model in any way.

Claims (8)

  1. The LED power supply current linear stabilizing and increasing circuit is characterized by comprising a power supply unit and a linear constant current control unit, wherein the power supply unit is used for supplying power to the linear constant current control unit; the linear constant current control unit comprises a signal voltage control circuit and a constant current output circuit, wherein:
    the signal voltage control circuit is connected with the constant current output circuit through an electric signal, the signal voltage control circuit comprises a voltage reduction and voltage stabilization circuit, and the direct current power supply outputs a voltage signal for controlling the current of the LED load D2 after passing through the voltage reduction and voltage stabilization circuit;
    the constant current output circuit is used for linearly controlling the current of an LED load D2 and comprises a triode Q1 and a triode Q2, two ends of the LED load D2 are respectively connected to collectors of a triode Q1 and a triode Q2, and an emitter of the Q2 is connected with a potentiometer RP 2.
  2. 2. The LED power supply current linear stabilizing circuit of claim 1, wherein the voltage reduction and stabilizing circuit comprises a chip LM317, a capacitor C1, a capacitor C2, a resistor R1 and a potentiometer RP1, wherein the capacitors C1 and C2 are connected in parallel and then connected with a pin 1 of the LM 317; the resistor R1 is connected between pin 2 and pin 3 of the LM 317; one end of the potentiometer RP1 is connected with the pin 2 of the LM317, and the other end is connected with the resistor R1; and the pin 3 of the LM317 is connected with the constant current output circuit.
  3. 3. The LED power supply current linear stabilizing circuit as claimed in claim 2, wherein the voltage U output from the LM317 pin 3 isOThe relationship between the resistor R1 and the potentiometer RP1 is:
    Figure FDA0002577551480000011
    wherein R isP1Is the resistance, R, of potentiometer RP11Is the resistance of resistor R1.
  4. 4. The LED power supply current linear regulator circuit according to claim 2, wherein the constant current output circuit further comprises an operational amplifier U1A and an operational amplifier U1B, pin 3 of the LM317 is connected to the non-inverting input terminal of the operational amplifier U1A, the output terminal of the operational amplifier U1A is connected to the base terminal of a transistor Q1, the collector terminal of a transistor Q1 is connected to the positive dc power supply, and the emitter terminal is connected to the base terminal of a transistor Q2; the emitter of the triode Q2 is connected with the inverting input end of the operational amplifier U1B and the potentiometer RP2, the other end of the potentiometer RP2 is grounded and connected with the resistor R3, the other end of the resistor R3 is connected with the non-inverting input end of the operational amplifier U1B and the resistor R2, and the resistor R2 is connected with the output end of the operational amplifier U1B and then connected with the inverting input end of the channel of the operational amplifier U1A.
  5. 5. The LED power supply current linear stabilizing circuit as claimed in claim 4, wherein the operational amplifier U1A and operational amplifier U1B adopt LM358 amplifier.
  6. 6. The LED power supply current linear stabilizing circuit as claimed in claim 4, wherein the current flowing through the LED load D2 is as follows:
    Figure FDA0002577551480000021
    wherein R isp2Is the resistance, R, of potentiometer RP22Is the resistance of resistor R2, R3Is the resistance of resistor R3.
  7. 7. The LED power supply current linear stabilizing circuit as claimed in claim 1, wherein the power supply unit adopts a +15V direct current power supply single power supply for power supply.
  8. 8. The LED power supply current linear stabilizing circuit as claimed in claim 4, wherein the power supply unit comprises a MAX766 chip, the MAX766 chip being used for converting +15V voltage into-15V voltage to provide negative electricity for the operational amplifiers U1A and U1B.
CN202021338627.5U 2020-07-09 2020-07-09 LED power supply current linear steady-state increasing circuit Active CN212183769U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115033045A (en) * 2022-04-29 2022-09-09 武汉湃威光电科技有限公司 APD-TIA TO aging system
CN117374725A (en) * 2023-12-05 2024-01-09 成都光创联科技有限公司 Burst mode laser drive control circuit and method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115033045A (en) * 2022-04-29 2022-09-09 武汉湃威光电科技有限公司 APD-TIA TO aging system
CN117374725A (en) * 2023-12-05 2024-01-09 成都光创联科技有限公司 Burst mode laser drive control circuit and method
CN117374725B (en) * 2023-12-05 2024-03-19 成都光创联科技有限公司 Burst mode laser drive control circuit and method

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