CN109669504B - TL431 application power supply line structure, voltage stabilizing method and application - Google Patents

TL431 application power supply line structure, voltage stabilizing method and application Download PDF

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Publication number
CN109669504B
CN109669504B CN201910009273.5A CN201910009273A CN109669504B CN 109669504 B CN109669504 B CN 109669504B CN 201910009273 A CN201910009273 A CN 201910009273A CN 109669504 B CN109669504 B CN 109669504B
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voltage
triode
resistor
tube
power supply
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CN109669504A (en
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刘红霞
王凯
李翠
许拴拴
王俊峰
王英武
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Xian Microelectronics Technology Institute
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    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/10—Regulating voltage or current
    • G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
    • G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0045—Converters combining the concepts of switch-mode regulation and linear regulation, e.g. linear pre-regulator to switching converter, linear and switching converter in parallel, same converter or same transistor operating either in linear or switching mode
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0083—Converters characterised by their input or output configuration

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Automation & Control Theory (AREA)
  • Control Of Voltage And Current In General (AREA)
  • Control Of Electrical Variables (AREA)

Abstract

The invention relates to a TL431 applied power supply line structure, a voltage stabilizing method and application.A input voltage end is connected with one end of a current limiting resistor R3, a triode Q2 collector and an MOS transistor Q1 drain; the other end of the current-limiting resistor R3 is connected with the cathode of a voltage regulator tube Z1 and the base electrode of a triode Q2, the anode of the voltage regulator tube Z1 is grounded, the emitter of the triode Q2 is connected with one end of a resistor R4, and the other end of the resistor R4 is connected with the grid of an MOS tube Q1 and the output end of a three-end programmable precision reference source U1; the anode of the three-terminal programmable precision reference source U1 is grounded, the reference terminal is connected with one end of a sampling resistor R1 and one end of a sampling resistor R2, the other end of the sampling resistor R2 is grounded, the other end of the sampling resistor R1 is connected with the source electrode of an MOS tube Q1, and the source electrode of the MOS tube Q1 is a power supply terminal in the system. The output voltage can be stabilized by adjusting the cathode of the three-terminal programmable precision reference source U1. The problem of limitation of input voltage in a TL431 typical application power supply line is solved.

Description

TL431 application power supply line structure, voltage stabilizing method and application
Technical Field
The invention belongs to the field of power supply lines, and particularly relates to a TL431 application power supply line structure, a voltage stabilizing method and application.
Background
The power supply line is usually used for supplying power to the circuits of each control function unit in the electronic system, and is a necessary condition for the normal operation of each function unit of the electronic system. Electronic engineers have paid much attention to power supply lines in electronic systems, such as a linear regulator power supply line structure and a constant current power supply line structure, which are the most common. In the aspect of device application, the three-end programmable precision reference source (TL431) has a simple structure due to the characteristics of programmable control of output voltage, built-in reference source and the like. The TL431 has been studied in relatively many applications in the power supply line, and the currently available TL431 application power supply lines are roughly classified into the following types.
FIG. 1 is one of the typical application lines of a series regulator formed by TL431 with current limitingThe circuit comprises a resistor R1, a three-terminal programmable precision reference source U1, a triode P1, a capacitor C1, a sampling resistor R2 and a sampling resistor R3, wherein the chip U1 is TL 431. When the circuit is in operation, the input voltage VinThe current limiting resistor R1 provides working current for U1, and the output voltage is sampled by the sampling resistors R2 and R3 and then input to the REF end of U1, namely point B. Thus the output end VoutCan be fed back to the output terminal a point of U1 through the sampling resistor R2 and the sampling resistor R3. The voltage at the point A controls the base of the transistor P1 to adjust the voltage V of the transistor P1 in real timeceSo that the output end VoutThe voltage of the capacitor is stabilized. The circuit structure has the advantages of simple structure, stable output voltage and output voltage Vout＝(1+R2/R3)VB(ii) a The disadvantage is that the input voltage at the input is limited, Vin(max)≤36V。
Fig. 2 shows a second typical application circuit of a series regulator composed of TL431, and the second typical application circuit is composed of a current limiting resistor R1, a three-terminal programmable precision reference source U1, a MOS transistor P1, a capacitor C1, and sampling resistors R2 and R3, where U1 is TL 431. When the circuit is in operation, the input voltage VinThe current limiting resistor R1 provides working current for the chip U1, and the output voltage is sampled by the resistors R2 and R3 and then input to the REF end of U1, namely the point B. Thus, the output terminal VoutCan be fed back to the output terminal a point of U1 through the sampling resistors R2 and R3. The voltage at the point A controls the gate voltage of the MOS transistor P1 to adjust the voltage V of the MOS transistor P1 in real timeDSSo that the output end VoutThe voltage of the capacitor is stabilized. The circuit structure has the advantages of simple structure, stable output voltage and output voltage Vout＝(1+R2/R3)VB(ii) a The disadvantage is that the input voltage at the input is limited, Vin(max)≤36V。
It can be seen that the power supply line for the conventional TL431 has a simple structure, but has a common disadvantage that the input voltage (V) of the power supply linein) The power supply range of the TL431 cannot be exceeded, which is a limitation for the power supply line of the TL431 application, and limits the application range of the TL431 power supply line.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a TL431 application power supply line structure, a voltage stabilizing method and application, solves the problem of limitation of input voltage in a TL431 typical application power supply line, and can be applied to an electronic system with the input voltage ranging from 20V to 50V and 80V to 120V.
The invention is realized by the following technical scheme:
a TL431 application power supply line structure comprises a voltage regulator tube Z1, a sampling resistor R1, a sampling resistor R2, a current limiting resistor R3, a resistor R4, a triode Q2, an MOS tube Q1 and a three-terminal programmable precision reference source U1;
the input voltage end is connected with one end of the current-limiting resistor R3, the collector of the triode Q2 and the drain of the MOS transistor Q1; the other end of the current-limiting resistor R3 is connected with the cathode of a voltage regulator tube Z1 and the base electrode of a triode Q2, the anode of the voltage regulator tube Z1 is grounded, the emitter of the triode Q2 is connected with one end of a resistor R4, and the other end of the resistor R4 is connected with the grid of an MOS tube Q1 and the output end of a three-end programmable precision reference source U1; the anode of the three-terminal programmable precision reference source U1 is grounded, the reference terminal is connected with one end of a sampling resistor R1 and one end of a sampling resistor R2, the other end of the sampling resistor R2 is grounded, the other end of the sampling resistor R1 is connected with the source electrode of an MOS tube Q1, and the source electrode of the MOS tube Q1 is a power supply terminal in the system.
Preferably, the transistor Q2 is a transistor with a withstand voltage of 80V, and the MOS transistor Q1 is a MOS transistor with a withstand voltage of 100V.
Based on the power supply line structure, when the input voltage is smaller than the voltage stabilization value of a voltage stabilizing tube Z1, the input voltage directly provides current for the base electrode of a triode Q2 after passing through a current limiting resistor R3, the voltage stabilizing tube Z1 does not work, the emitting electrode of the triode Q2 is positively biased, the collecting electrode is reversely biased, and a triode Q2 works in an amplifying area to provide required working current for TL 431; after the output voltage passes through the sampling resistor R1 and the sampling resistor R2, the change of the output voltage is reflected to the reference end of the three-end programmable precision reference source U1, and further the grid-source voltage of the MOS tube Q1 can be changed by changing the cathode of the three-end programmable precision reference source U1, the drain-source voltage of the MOS tube Q1 is adjusted, and the output voltage is stabilized; when the input voltage is greater than the voltage stabilization value of a voltage stabilizing tube Z1, the cathode voltage of the voltage stabilizing tube Z1 is stabilized at the voltage stabilization value of a voltage stabilizing tube Z1, the emitting electrode of the triode Q2 is forward biased, the collecting electrode of the triode Q2 is reverse biased, and the triode Q2 works in an amplification region; the part of the voltage of which the input voltage is greater than the voltage-stabilizing value of the voltage-stabilizing tube Z1 falls on a collector and an emitter of the triode Q2, and the output voltage passes through the sampling resistor R1 and the sampling resistor R2, and then the drain-source voltage of the MOS tube Q1 is adjusted by changing the cathode of the three-terminal programmable precision reference source U1, so that the output voltage is stabilized.
The TL431 is applied to an electronic system with an input range of 20V-50V by applying a power supply line structure.
Preferably, the electronic system is a DC/DC converter.
The TL431 is applied to the power supply line structure and applied to an electronic system with an input range of 80V-120V.
Preferably, the electronic system is a DC/DC converter.
Compared with the prior art, the invention has the following beneficial technical effects:
according to the TL431 power supply circuit structure, by arranging a voltage regulator tube Z1 and a triode Q2, when the input voltage is larger than the voltage regulation value of a voltage regulator tube Z1, the cathode voltage of the voltage regulator tube Z1 is stabilized at the stable value of the voltage regulator tube Z1, the emitting electrode of a triode Q2 is forward biased, the collecting electrode of the triode Q2 is reverse biased, and the triode Q2 works in an amplification area; the partial voltage of which the input voltage is greater than the regulated voltage value of the voltage regulator tube Z1 falls on the collector and the emitter of the triode Q2, so that the limitation of the input voltage range of the triode Q2 by the working voltage range of the TL431 device is overcome, and the input voltage range of the triode Q2 is widened. By adjusting the internal devices Q1 and Q2, the present invention can be applied to electronic systems with higher or wider input voltage ranges. The invention has been applied to DC/DC modules with input voltages in the range of 20V to 50V and in the range of 80V to 120V. The invention solves the problem of limitation of input voltage in a TL431 typical application power supply line, enables the TL431 typical application power supply line to be suitable for a wider input voltage range, and greatly widens the application range of the TL431 power supply line.
Drawings
FIG. 1 is one of the power supply lines for a conventional TL431 application;
FIG. 2 shows a second conventional power supply line for TL 431;
FIG. 3 is a TL431 application supply line configuration of the present invention;
FIG. 4 is an example of one of the power supply lines of a prior art TL431 application;
FIG. 5 is an example of a second power supply line for a conventional TL431 application;
FIG. 6 shows an example of a TL431 power supply line configuration in accordance with the present invention.
Detailed Description
The present invention will now be described in further detail with reference to specific examples, which are intended to be illustrative, but not limiting, of the invention.
The TL431 disclosed by the invention adopts a power supply line structure, so that the limitation of the input voltage range of a TL431 device to the working voltage range is overcome, and the input voltage range is widened. By adapting the internal components, the invention can be applied even in electronic systems with a higher or wider input voltage range.
The power supply line structure designed in the invention is shown in fig. 3 and comprises a voltage regulator tube Z1, a sampling resistor R1, a sampling resistor R2, a current limiting resistor R3, a resistor R4, a triode Q2, a MOS tube Q1 and a three-terminal programmable precision reference source U1. The three-terminal programmable precision reference source U1 is TL 431. VinThe port being an input voltage terminal, VoutThe port is a system internal power supply end. The input voltage is connected with one end of the current-limiting resistor R3, the collector of the triode Q2 and the drain of the MOS transistor Q1. The other end of the current-limiting resistor R3 is connected with the cathode of the voltage regulator tube Z1 and the base of the triode Q2. The anode of the zener tube Z1 is grounded. The emitter of the transistor Q2 is connected to one end of the resistor R4. The other end of the resistor R4 is connected with the gate of the MOS transistor Q1 and the output end of the three-terminal programmable precision reference source U1, namely the cathode of the TL 431. The anode of the three-terminal programmable precision reference source U1 is grounded, the reference terminal is connected with the sampling resistor R1 and the sampling resistor R2, and the other end of the sampling resistor R2 is grounded. The other end of the sampling resistor R1 is connected with the source electrode of the MOS transistor Q1, namely VoutAnd the port is the power supply end inside the system.
The specific working mode is as follows: the input voltage of the input voltage end is connected with a voltage regulator tube Z1 after passing through a current limiting resistor R3. The regulated value of the regulator tube Z1 should be a certain voltage value less than 36V. When V isinInput voltage of portWhen the voltage value of the voltage regulator tube Z1 is smaller than the voltage regulation value of the voltage regulator tube Z1, the input voltage directly provides current for the base electrode of the triode Q2 after passing through the current limiting resistor R3, and the voltage regulator tube Z1 does not work. At this time, the emitter of the transistor Q2 is forward biased, the collector is reverse biased, and the transistor Q2 operates in the amplification region to provide the required operating current for the TL 431. VoutAfter the output voltage of the port passes through the sampling resistor R1 and the sampling resistor R2, the voltage V is converted into the voltage VoutThe change of the output voltage of the port is reflected to the reference end of the three-end programmable precision reference source U1, and the grid-source voltage of the MOS tube Q1 is changed by changing the cathode of the three-end programmable precision reference source U1, namely the level of the output end of the three-end programmable precision reference source U1, and the drain-source voltage of the MOS tube Q1 is adjusted to achieve stable VoutThe output voltage of the port. When V isinWhen the input voltage of the port is larger than the stabilized value of the voltage regulator tube Z1, the voltage of the point A is stabilized at the stabilized value of the voltage regulator tube Z1. At this time, the emitter of the transistor Q2 is forward biased, the collector is reverse biased, and the transistor Q2 operates in the amplification region. The emitter voltage of transistor Q2 is the base voltage minus the junction voltage of an emitter junction. VinThe partial voltage of the input voltage of the port, which is larger than the regulated voltage value of the regulator tube Z1, falls on the collector and the emitter of the triode Q2. VoutAfter the output voltage of the port passes through the sampling resistor R1 and the sampling resistor R2, the drain-source voltage of the MOS transistor Q1 is adjusted through the three-terminal programmable precision reference source U1 so as to achieve stable VoutThe output voltage of the port. In addition, the transistor Q2 with different withstand voltages can be selected according to different input voltage ranges.
Fig. 4, 5 and 6 show one of the TL431 applied power supply lines and two of the TL431 applied power supply lines described in the background art and application examples of the power supply circuit configuration of the present invention, respectively, and the power supply line loss comparison is shown in table 1.
TABLE 1 losses in the supply line
Figure BDA0001936597040000061
Example 1
The invention is applied to an electronic system with an input range of 20V-50V, and the typical input voltage is 28V, output voltage 15V and output power 30W. In this application, the zener diode Z1 has a zener voltage value of 24V. When V isinWhen the input voltage of the port is less than 24V, the input voltage directly provides current for the base electrode of the triode Q2 after passing through the current limiting resistor R3, and the voltage regulator tube Z1 does not work. At this time, the emitter of the transistor Q2 is forward biased, the collector is reverse biased, and the transistor Q2 works in an amplification region to provide the required working current for the three-terminal programmable precision reference source U1. VoutAfter the output voltage of the port passes through the sampling resistor R1 and the sampling resistor R2, the voltage V is converted into the voltage VoutThe change of the output voltage of the port is reflected to the reference end of the programmable precision reference source U1, and the cathode of the programmable precision reference source U1 is changed, so that the level of the output end of the programmable precision reference source U1 can be programmed, the grid-source voltage of the MOS tube Q1 is changed, the drain-source voltage of the MOS tube is adjusted, and the purpose of stabilizing V is achievedoutThe output voltage of the port. When V isinWhen the input voltage of the port increases to more than 24V, the voltage at point a stabilizes at 24V. At this time, the emitter of the transistor Q2 is forward biased, the collector is reverse biased, and the transistor Q2 operates in the amplification region. The emitter voltage of transistor Q2 is the base voltage minus the junction voltage of an emitter junction. VinThe voltage at the input of the port above 24V falls on the collector and emitter of transistor Q2. VoutAfter the output voltage of the port passes through the sampling resistor R1 and the sampling resistor R2, the drain-source voltage of the MOS transistor is adjusted through the chip U1 to achieve stable VoutThe output voltage of the port.
Example 2
The structure of the present invention is also applied to a DC/DC converter having an input range of 80V to 120V, and the use method is the same as that of embodiment 1.
In addition, the transistor Q2 with different withstand voltages can be selected according to different input voltage ranges. For example, when the input voltage range of the electronic system is 20V to 50V, the transistor with the withstand voltage of 80V is selected as Q2, and the MOS transistor with the withstand voltage of 100V is selected as Q1, so that the safety and reliability of the electronic system are fully considered.
The novel TL431 power supply line structure is put into military DC/DC converter designs of 20V-50V series and 80V-120V series, solves the input voltage limitation of TL431 series voltage regulators and widens the application range of the TL431 series voltage regulators.
The TL431 application power supply line structure solves the problem of limitation of input voltage in a TL431 typical application power supply line, enables the TL431 application power supply line structure to be suitable for a wider input voltage range, and greatly widens the application range of the TL431 application power supply line.

Claims (7)

1. A TL431 application power supply line structure is characterized by comprising a voltage regulator tube Z1, a sampling resistor R1, a sampling resistor R2, a current limiting resistor R3, a resistor R4, a triode Q2, an MOS tube Q1 and a three-terminal programmable precision reference source U1;
the input voltage end is connected with one end of the current-limiting resistor R3, the collector of the triode Q2 and the drain of the MOS transistor Q1; the other end of the current-limiting resistor R3 is connected with the cathode of a voltage regulator tube Z1 and the base electrode of a triode Q2, the anode of the voltage regulator tube Z1 is grounded, the emitter of the triode Q2 is connected with one end of a resistor R4, and the other end of the resistor R4 is connected with the grid of an MOS tube Q1 and the output end of a three-end programmable precision reference source U1; the anode of the three-terminal programmable precision reference source U1 is grounded, the reference terminal is connected with one end of a sampling resistor R1 and one end of a sampling resistor R2, the other end of the sampling resistor R2 is grounded, the other end of the sampling resistor R1 is connected with the source electrode of an MOS tube Q1, and the source electrode of the MOS tube Q1 is a power supply terminal in the system.
2. The power feeding line structure of TL431 of claim 1 wherein transistor Q2 is 80V withstanding voltage transistor and MOS transistor Q1 is 100V withstanding voltage MOS transistor.
3. A voltage stabilization method of a TL431 applied power supply line is characterized in that based on the power supply line structure of claim 1 or 2, when the input voltage is smaller than the voltage stabilization value of a voltage stabilizing tube Z1, the input voltage directly provides current for the base electrode of a triode Q2 after passing through a current limiting resistor R3, the voltage stabilizing tube Z1 does not work, the emitting electrode of the triode Q2 is positively biased, the collecting electrode is reversely biased, and a triode Q2 works in an amplifying area to provide required working current for the TL 431; after the output voltage passes through the sampling resistor R1 and the sampling resistor R2, the change of the output voltage is reflected to the reference end of the three-end programmable precision reference source U1, and further the grid-source voltage of the MOS tube Q1 can be changed by changing the cathode of the three-end programmable precision reference source U1, the drain-source voltage of the MOS tube Q1 is adjusted, and the output voltage is stabilized; when the input voltage is greater than the voltage stabilization value of a voltage stabilizing tube Z1, the cathode voltage of the voltage stabilizing tube Z1 is stabilized at the voltage stabilization value of a voltage stabilizing tube Z1, the emitting electrode of the triode Q2 is forward biased, the collecting electrode of the triode Q2 is reverse biased, and the triode Q2 works in an amplification region; the part of the voltage of which the input voltage is greater than the voltage-stabilizing value of the voltage-stabilizing tube Z1 falls on a collector and an emitter of the triode Q2, and the output voltage passes through the sampling resistor R1 and the sampling resistor R2, and then the drain-source voltage of the MOS tube Q1 is adjusted by changing the cathode of the three-terminal programmable precision reference source U1, so that the output voltage is stabilized.
4. The use of the TL431 application power line structure of claim 1 or 2, characterized by its application in electronic systems with input range of 20V to 50V.
5. The use of the TL431 supply line structure of claim 4 where the electronic system is a DC/DC converter.
6. The use of the TL431 application power line structure of claim 1, wherein the application is in an electronic system with an input range of 80V to 120V.
7. The use of the TL431 supply line structure of claim 6 where the electronic system is a DC/DC converter.
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CN110445395A (en) * 2019-08-13 2019-11-12 苏州格远电气有限公司 Wide-voltage range direct current input switch power supply
CN112531647B (en) * 2020-12-10 2022-03-01 东风汽车集团有限公司 Linear voltage-stabilized power supply circuit applied to automobile electronic controller
CN113075951A (en) * 2021-04-07 2021-07-06 无锡市欧瑞杰电子科技有限公司 Pre-voltage stabilizing circuit and power supply

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CN101308391A (en) * 2008-06-27 2008-11-19 深圳市麦格米特驱动技术有限公司 High precision low pressure difference linear voltage-stabilizing circuit
CN201215989Y (en) * 2008-06-23 2009-04-01 青岛海信电器股份有限公司 Voltage stabilizing circuit and television set having the voltage stabilizing circuit
CN103545803A (en) * 2013-10-31 2014-01-29 广东威创视讯科技股份有限公司 Protective device of equipment power source interface circuit
CN206099293U (en) * 2016-06-12 2017-04-12 广东金莱特电器股份有限公司 High voltage input protection circuit

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Publication number Priority date Publication date Assignee Title
CN201215989Y (en) * 2008-06-23 2009-04-01 青岛海信电器股份有限公司 Voltage stabilizing circuit and television set having the voltage stabilizing circuit
CN101308391A (en) * 2008-06-27 2008-11-19 深圳市麦格米特驱动技术有限公司 High precision low pressure difference linear voltage-stabilizing circuit
CN103545803A (en) * 2013-10-31 2014-01-29 广东威创视讯科技股份有限公司 Protective device of equipment power source interface circuit
CN206099293U (en) * 2016-06-12 2017-04-12 广东金莱特电器股份有限公司 High voltage input protection circuit

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