CN209895208U - Controllable linear voltage stabilizer - Google Patents
Controllable linear voltage stabilizer Download PDFInfo
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- CN209895208U CN209895208U CN201921047151.7U CN201921047151U CN209895208U CN 209895208 U CN209895208 U CN 209895208U CN 201921047151 U CN201921047151 U CN 201921047151U CN 209895208 U CN209895208 U CN 209895208U
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Abstract
The utility model discloses a controllable type linear voltage regulator, include: the source electrode of the first field effect switching tube is connected with an input voltage source, and the drain electrode of the first field effect switching tube is connected with a load and used for controlling the on-off of the voltage stabilizer; the output end of the driving circuit is connected with the grid electrode of the first field effect switching tube and is used for controlling the conduction and/or the disconnection of the first field effect switching tube; the driving circuit comprises a micro voltage converter, a voltage input pin of the micro voltage converter is connected with an input voltage source, and a voltage output pin of the micro voltage converter is connected with an input end of the current reduction type protection circuit; the output end of the current reduction type protection circuit is connected with the grid electrode of the first field effect switching tube. The switching control part of the voltage stabilizer is changed, the switching control design is changed into a design that only the switching control is carried out, the grid electrode of the field effect switching tube is driven by the driving circuit provided with the current reduction type protection circuit, a completely controlled mode which can be switched off and opened is realized, the function that the output is controlled by the switch is realized, and the intelligent control of a power supply system is further matched.
Description
Technical Field
The utility model relates to a switching power supply technical field, concretely relates to controllable type linear voltage regulator of dilatation.
Background
The power stabilizer is an energy-saving product developed for stabilizing alternating voltage according to the western european technology. When the voltage fluctuation of the external power supply network or the load fluctuation causes the voltage fluctuation, the stability of the output voltage can be automatically kept.
As shown in fig. 1, the conventional power regulator stabilizes the output voltage by means of the bounce of the relay, and when the grid voltage fluctuates, the power regulator automatically corrects the circuit to start, so that the internal relay acts to force the output voltage to be kept near the set value.
SUMMERY OF THE UTILITY MODEL
In view of this, the embodiment of the present invention provides a controllable linear voltage regulator, including:
the source electrode of the first field effect switching tube is connected with an input voltage source, and the drain electrode of the first field effect switching tube is connected with a load and used for controlling the on-off of the voltage stabilizer;
the output end of the driving circuit is connected with the grid electrode of the first field effect switching tube and is used for controlling the conduction and/or the disconnection of the first field effect switching tube;
the driving circuit comprises a micro voltage converter, a voltage input pin of the micro voltage converter is connected with an input voltage source, and a voltage output pin of the micro voltage converter is connected with an input end of the current reduction type protection circuit; the output end of the current reduction type protection circuit is connected with the grid electrode of the first field effect switching tube.
Optionally, the method further comprises: and the second field effect switching tube is connected with the first field effect switching tube in parallel, the source electrode of the second field effect switching tube is connected with an input voltage source, the drain electrode of the second field effect switching tube is connected with a load, and the grid electrode of the second field effect switching tube is connected with the output end of the driving circuit.
Optionally, the current reduction type protection circuit includes:
the first field effect switch tube is an N-channel power MOS tube and is used for replacing an adjusting tube;
the R pole of the first TL431 is connected with the K pole of the first TL431, the A pole of the first TL431 is grounded, and one end of the K pole of the first TL431 is connected with a first resistor and a second resistor in series;
a K pole of the second TL431 is connected with one end, far away from the first TL431, of the second resistor, an R pole of the second TL431 is connected with an R pole of the first TL341 through a sliding rheostat, and an A pole of the second TL431 is grounded;
the K pole of the second TL431 is also connected with the grid of the first field effect switch tube.
Optionally, the method further comprises:
the VO pin of the input end of the first photoelectric coupler is connected with a 12V direct-current power supply, the GND pin is grounded, the first pin of the output end of the first photoelectric coupler is connected with the source electrode of the first field-effect switch tube, and the second pin of the output end of the first photoelectric coupler is connected with the A pole of the second TL431 and used for isolating and controlling the on-off of the first field-effect switch tube and/or the second field-effect switch tube.
Optionally, the method further comprises:
and the VO pin of the input end of the second photoelectric coupler is connected with a 12V direct-current power supply, the GND pin is grounded, the first pin of the output end of the second photoelectric coupler is connected with the voltage output pin of the miniature voltage converter, and the second pin of the output end of the second photoelectric coupler is connected with one end, far away from the first TL431, of the first resistor and is used for isolating and controlling the on-off of the first field-effect switch tube and/or the second field-effect switch tube.
Optionally, the VO pin of the input end of the first photocoupler is connected with the GND pin of the input end of the second photocoupler.
Optionally, the GND pin of the input end of the first photocoupler is connected with the output end of the line stabilization control circuit.
Optionally, the method further comprises: and the at least one external driving circuit is connected with the grid electrode of the first field effect switching tube.
Has the advantages that:
1. the switching control part of the voltage stabilizer is changed, the switching control design is changed into a design that only the switching control is carried out, the grid electrode of the field effect switching tube is driven by the driving circuit provided with the current reduction type protection circuit, a completely controlled mode which can be switched off and opened is realized, the function that the output is controlled by the switch is realized, and the intelligent control of a power supply system is further matched.
2. The output power capacity expansion is realized by connecting a plurality of switching tubes in parallel and controlling the switching tubes by the same drive, and further power capacity expansion can be realized by externally connecting the switching tubes, so that the power consumption of a single tube is reduced, and the reliability of the voltage stabilizer is improved.
3. From TL431U1And U2The combination of (A) and (B) constituting a flow reductionThe adjusting tube of the protective circuit reduces VBE2So as to achieve the purpose of reducing the Rd power consumption.
4. The output of the drive circuit is isolated and controlled by adopting the photoelectric coupler, so that the isolation between the external control and the existing circuit is realized without mutual influence.
Drawings
The features and advantages of the invention will be more clearly understood by reference to the accompanying drawings, which are schematic and should not be understood as imposing any limitation on the invention, in which:
FIG. 1 is a circuit schematic of a prior art voltage regulator;
fig. 2 is a schematic circuit diagram of a controllable linear regulator according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a current reducing protection circuit of a controllable linear regulator according to an embodiment of the present invention;
fig. 4 is a graph showing a relationship between an output current and an output voltage of a current reduction type protection circuit according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a current reducing protection circuit of another controllable linear regulator 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 embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present invention.
An embodiment of the utility model provides a controllable type linear voltage regulator, as shown in fig. 2, including first field effect switch pipe V1 and drive circuit: the source electrode of the first field effect switching tube V1 is connected with an input voltage source, and the drain electrode is connected with a load and used for controlling the on-off of the voltage stabilizer; the output end of the driving circuit is connected with the grid electrode of the first field effect switching tube V1 and is used for controlling the conduction and/or the disconnection of the field effect switching tube; the driving circuit comprises a micro voltage converter, a voltage input pin of the micro voltage converter is connected with an input voltage source, and a voltage output pin of the micro voltage converter is connected with an input end of the current reduction type protection circuit; the output end of the current reduction type protection circuit is connected with the grid of the first field effect switch tube V1.
In the embodiment, the current reducing protection circuit is adopted, compared with the current limiting protection circuit, the current reducing protection circuit does not burn the adjusting tube when the output end is in short circuit, and compared with the current stopping protection circuit, the current reducing protection circuit can recover power supply without turning off the power supply again after the fault is eliminated after the output end is in short circuit. Fig. 3 is a current reducing protection circuit diagram, and the gate of the field effect transistor BG1 is connected with an error amplifier. When the output current reaches the maximum output current, the load is increased, and the output current is not increased but reduced. The larger the load, the smaller the output current, which is the characteristic of the current reduction type protection circuit. The output current versus output voltage relationship is shown in fig. 4. Wherein, error amplification: if the circuit is used as a voltage stabilizing source (with a current reducing type protection function), the accessed error amplification signal is a signal obtained by sampling output voltage and amplifying the sampled output voltage in an inverted phase.
The switching control part of the voltage stabilizer is changed, the switching control design is changed into a design that only the switching control is carried out, the grid electrode of the field effect switching tube is driven by the driving circuit provided with the current reduction type protection circuit, a completely controlled mode which can be switched off and opened is realized, the function that the output is controlled by the switch is realized, and the intelligent control of a power supply system is further matched.
As an optional implementation, further comprising: and the second field effect switch tube V2 is connected with the first field effect switch tube V1 in parallel, the source electrode of the second field effect switch tube V2 is connected with an input voltage source, the drain electrode is connected with a load, and the grid electrode is connected with the output end of the driving circuit.
In the embodiment, a plurality of switching tubes are connected in parallel, the switching tubes are controlled by the same drive, output power expansion is realized, further power expansion can be realized through the external switching tubes, single-tube power consumption is reduced, and the reliability of the voltage stabilizer is improved.
As an alternative embodiment, the current reduction type protection circuit includes: the first field effect switch tube is an N-channel power MOS tube and is used for replacing an adjusting tube; the R pole of the first TL431 is connected with the K pole of the first TL431, the A pole of the first TL431 is grounded, and one end of the K pole of the first TL431 is connected with a first resistor and a second resistor in series; a K pole of the second TL431 is connected with one end, far away from the first TL431, of the second resistor, an R pole of the second TL431 is connected with an R pole of the first TL341 through a sliding rheostat, and an A pole of the second TL431 is grounded; the K-pole of the second TL431 is also connected to the gate of the first field effect switch V1.
In the present embodiment, in order to improve the circuit efficiency, the conduction loss of the tuning tube can be reduced. An adjusting tube in the basic current reduction type protection circuit is changed into an N-channel power MOS tube from an original power triode. The conduction voltage drop of a power triode is generally large, taking a commonly used high-power triode 2N3055 as an example, the conduction voltage drop is typically 1.1V, and when the triode is completely conducted, if Io is 40A, Pw is 44W; the on-resistance of the power MOS transistor is only a few m omega to a few tens m omega, taking FB190SA10 as an example,
rds (on) is 0.0065 Ω, when the field tube is fully conducted, if Io is 40A, Pw is 10.4W.
In an embodiment, the controllable linear regulator adopts the current reduction type protection circuit shown in fig. 5, BG1 is a first field effect switch tube, and the gate of the switch tube BG1 shown in fig. 5 is connected to an error amplifier.
To improve circuit efficiency, the sampling resistance R may be reduceddThe power consumption of (2). Can be reduced by reducing VBE2To reduce Rd"BG 2" in the improved current reducing type protection circuit is represented by TL431U1And U2In order to reduce VBE2So as to achieve the purpose of reducing the Rd power consumption. TL431 has the characteristics of high stability, high gain and good consistency, VREFRated at 2.5V, V of TL431 of the same batchREFThe difference being about a few millivolts to a dozen millivolts, i.e. equivalentVBE2≈VREFVZ is about a few millivolts to a dozen millivolts. It can be seen that the equivalent V isBE2Will allow the sampling resistance R to be reduceddThe gain is small and the efficiency of the power supply is greatly improved.
As an optional implementation, further comprising:
the VO pin of the input end of the first photoelectric coupler is connected with a 12V direct-current power supply, the GND pin is grounded, the first pin of the output end of the first photoelectric coupler is connected with the source electrode of the first field-effect switch tube V1, and the second pin of the output end of the first photoelectric coupler is connected with the A pole of the second TL431 and used for isolating and controlling the on-off of the first field-effect switch tube and/or the second field-effect switch tube V2.
In this embodiment, the first photocoupler is used for isolating and controlling the output of the driving circuit, so as to realize the isolation between the external control and the existing circuit without mutual influence.
As an optional implementation, further comprising:
and the VO pin of the input end of the second photoelectric coupler is connected with a 12V direct-current power supply, the GND pin is grounded, the first pin of the output end of the second photoelectric coupler is connected with the voltage output pin of the miniature voltage converter, and the second pin of the output end of the second photoelectric coupler is connected with one end, far away from the first TL431, of the first resistor and is used for isolating and controlling the on-off of the first field-effect switch tube and/or the second field-effect switch tube V2.
In this embodiment, the second photocoupler is used for isolating and controlling the output of the driving circuit, so as to realize the isolation between the external control and the existing circuit without mutual influence.
In an alternative embodiment, the VO pin of the input terminal of the first photocoupler is connected to the GND pin of the input terminal of the second photocoupler.
In this embodiment, the input terminal of the first photocoupler is connected in series with the input terminal of the second photocoupler, so that wiring is reduced and the structure is simple.
As an alternative embodiment, the GND pin of the input terminal of the first photocoupler is connected with the output terminal of the line stabilization control circuit.
In this embodiment, the input terminal of the first photoelectric coupler is connected to the output terminal of the linear voltage stabilization control circuit, so as to ensure the voltage stability of the input terminal of the first photoelectric coupler. The linear stability control has the function of realizing the switch control of the linear voltage stabilizer and can be flexibly applied to each controllable direct current shunt.
As an optional implementation, further comprising: and the at least one external driving circuit is connected with the grid electrode of the first field effect switching tube.
In this embodiment, as shown in fig. 2, the plurality of external driving circuits realize parallel connection of the plurality of field effect transistors, thereby realizing power capacity expansion of the linear regulator.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope defined by the appended claims.
Claims (8)
1. A controllable linear regulator, comprising:
the source electrode of the first field effect switching tube is connected with an input voltage source, and the drain electrode of the first field effect switching tube is connected with a load and used for controlling the on-off of the voltage stabilizer;
the output end of the driving circuit is connected with the grid electrode of the first field effect switching tube and is used for controlling the conduction and/or the disconnection of the first field effect switching tube;
the driving circuit comprises a micro voltage converter, a voltage input pin of the micro voltage converter is connected with the input voltage source, and a voltage output pin of the micro voltage converter is connected with the input end of the current reduction type protection circuit; and the output end of the current reduction type protection circuit is connected with the grid electrode of the first field effect switching tube.
2. The controllable linear regulator of claim 1, further comprising: and the second field effect switching tube is connected with the first field effect switching tube in parallel, the source electrode of the second field effect switching tube is connected with an input voltage source, the drain electrode of the second field effect switching tube is connected with a load, and the grid electrode of the second field effect switching tube is connected with the output end of the driving circuit.
3. The controllable linear regulator of claim 1, wherein the current reduction type protection circuit comprises:
the first field effect switch tube is an N-channel power MOS tube and is used for replacing an adjusting tube;
the R pole of the first TL431 is connected with the K pole of the first TL431, the A pole of the first TL431 is grounded, and one end of the K pole of the first TL431 is connected with a first resistor and a second resistor in series;
a K pole of the second TL431 is connected to one end of the second resistor far from the first TL431, an R pole of the second TL431 is connected to an R pole of the first TL341 through a sliding rheostat, and an a pole of the second TL431 is grounded;
the K pole of the second TL431 is also connected with the grid electrode of the first field effect switch tube.
4. The controllable linear regulator of claim 3, further comprising:
the VO pin of the input end of the first photoelectric coupler is connected with a 12V direct-current power supply, the GND pin is grounded, the first pin of the output end of the first photoelectric coupler is connected with the source electrode of the first field-effect switch tube, and the second pin of the output end of the first photoelectric coupler is connected with the A pole of the second TL431 and is used for isolating and controlling the on-off of the first field-effect switch tube and/or the second field-effect switch tube.
5. The controllable linear regulator of claim 4, further comprising:
and a VO pin at the input end of the second photoelectric coupler is connected with a 12V direct-current power supply, a GND pin is grounded, a first pin at the output end of the second photoelectric coupler is connected with a voltage output pin of the miniature voltage converter, and a second pin at the output end of the second photoelectric coupler is connected with one end, far away from the first TL431, of the first resistor and is used for isolating and controlling the on-off of the first field-effect switch tube and/or the second field-effect switch tube.
6. The controllable linear regulator according to claim 5, wherein the VO pin of the input terminal of the first photocoupler is connected to the GND pin of the input terminal of the second photocoupler.
7. The voltage regulator according to claim 6, wherein the GND pin of the input terminal of the first optocoupler is coupled to the output terminal of the line stability control circuit.
8. The controllable linear regulator of claim 1, further comprising: and the at least one external driving circuit is connected with the grid electrode of the first field effect switching tube.
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| CN201921047151.7U CN209895208U (en) | 2019-07-06 | 2019-07-06 | Controllable linear voltage stabilizer |
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| CN201921047151.7U CN209895208U (en) | 2019-07-06 | 2019-07-06 | Controllable linear voltage stabilizer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111665896A (en) * | 2020-06-24 | 2020-09-15 | 西安微电子技术研究所 | Controllable low-voltage-difference high-power voltage stabilizing circuit of optical isolating switch |
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2019
- 2019-07-06 CN CN201921047151.7U patent/CN209895208U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111665896A (en) * | 2020-06-24 | 2020-09-15 | 西安微电子技术研究所 | Controllable low-voltage-difference high-power voltage stabilizing circuit of optical isolating switch |
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