CN205680030U - Low-power consumption mu balanced circuit - Google Patents
Low-power consumption mu balanced circuit Download PDFInfo
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- CN205680030U CN205680030U CN201620563264.2U CN201620563264U CN205680030U CN 205680030 U CN205680030 U CN 205680030U CN 201620563264 U CN201620563264 U CN 201620563264U CN 205680030 U CN205680030 U CN 205680030U
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Abstract
The utility model discloses a kind of low-power consumption mu balanced circuit, described mu balanced circuit includes adjustment unit, sampling unit and feedback control unit, and wherein, described adjustment unit receives an input voltage, adjusts output one output voltage；Described sampling unit is sampled from output voltage and is exported a sampled voltage signal；Described feedback control unit, according to the sampled voltage signal of described sampling unit, controls described adjustment unit and carries out Voltage Cortrol, in order to regulated output voltage.Device used by the utility model is few, simple in construction, small scale, and power consumption is extremely low.
Description
Technical Field
The utility model relates to an electronic circuit, specifically speaking relates to a miniature low-power consumption voltage stabilizing circuit.
Background
In the field of analog electronic circuit technology, a voltage regulator circuit is a circuit that can maintain an output voltage constant even when an input voltage, a load, an ambient temperature, circuit parameters, and the like change, and the circuit can provide a stable dc power supply and is widely used in various electronic devices. According to application scenes and precision requirements, the voltage stabilizing circuit has various circuit structures and different costs.
In order to achieve stable voltage output, the conventional voltage stabilizing circuit usually needs more devices, often from dozens to dozens of devices, and in order to enable the devices to work, the working power consumption of the conventional voltage stabilizing circuit is high, and the working current at least exceeds one hundred microamperes (uA).
Some voltage stabilizing circuits are realized by adopting integrated circuit chips, and have complex process and relatively high cost.
For consumer electronic products powered by small-capacity button batteries, the voltage of the battery is greatly changed in the normal use process and is limited by the capacity of the battery, so that the power consumption of a voltage stabilizing circuit applicable to the battery cannot be too large. And because of the cost of the product, the cost of the required low-power consumption voltage stabilizing circuit cannot be too high. However, the current voltage regulator circuit has either excessive power consumption (operating current of hundreds of microamperes (uA)) or excessive cost, and thus there is a need in the industry for a voltage regulator circuit with low cost and low power consumption to supply power to such small-capacity button cell power supply consumer electronic products.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model lies in, to prior art's not enough, provide a voltage stabilizing circuit small-size, low-cost, low-power consumption.
In order to solve the technical problem, the utility model provides a voltage stabilizing circuit, include:
the input end of the adjusting unit is a voltage input end, the output end of the adjusting unit is a voltage output end, and the adjusting unit comprises an adjusting control end;
the sampling unit is connected with the voltage output end and samples and outputs a sampling voltage signal from the output voltage; and
and the input end of the feedback control unit is connected with the sampling unit, the output end of the feedback control unit is connected with the adjustment control end of the adjustment unit, and the adjustment unit adjusts the voltage according to the control signal of the feedback control unit so as to stabilize the output voltage.
Wherein the feedback control unit includes:
the inverting circuit is connected with the sampling unit and used for outputting a voltage signal with the variation opposite to that of the sampling voltage signal according to the input sampling voltage signal; and
and the control circuit is connected with the phase inverting circuit and outputs a control signal to the adjustment control end of the adjustment unit according to the voltage signal from the phase inverting circuit.
The adjusting unit comprises a first transistor, wherein an emitter or a collector of the first transistor serves as an input end to receive input voltage, the collector or the emitter serves as a voltage output end, and a base serves as an adjusting control end to receive a control signal from the control circuit.
Further, the inverter circuit includes a second transistor, and the control circuit includes a third transistor; wherein,
the base electrode of the second transistor serves as an input end to receive a sampling voltage signal of a sampling unit, and the collector electrode of the second transistor serves as an output end to output a voltage signal with the variation opposite to that of the sampling voltage signal to the base electrode of the third transistor;
the base of the third transistor receives the voltage signal which is sent by the collector of the second transistor and has the opposite variation of the sampled voltage signal, and the current signal with the opposite variation of the current to the variation of the sampled voltage is provided to the base of the first transistor through the collector.
Preferably, the control circuit further comprises a current limiting resistor connected between the collector of the third transistor and the base of the first transistor.
In addition, the second transistor and the third transistor are the same type of transistor, and the first transistor is of the opposite type to the second and third transistors.
The transistor is an NPN type transistor or a PNP type transistor.
The sampling unit comprises a plurality of series resistors, and a sampling voltage signal is output at the connection position of the series resistors.
According to the technical scheme, the utility model has the advantages that the number of used devices is small, and the overall structure is simple and the scale is small through the ingenious design; in a system with low load capacity requirement, a special voltage stabilizing source chip can be replaced, so that the cost can be greatly reduced. Moreover, the power consumption of the voltage stabilizing circuit provided by the utility model is extremely low, the working current can be less than 5 microamperes, and the working current of the chip adopted by the prior art is about hundreds of microamperes, so that the power consumption of the voltage stabilizing circuit of the utility model is one tenth of the power consumption of the prior art; in this way, a more permanent power supply can be provided for such consumer electronics products as smart cups.
Drawings
Fig. 1 is a schematic block diagram of a voltage stabilizing circuit according to the present invention;
fig. 2 is a schematic block diagram of the feedback control unit according to the present invention;
FIG. 3 is a schematic circuit diagram of an embodiment of the present invention;
FIG. 4 is a schematic circuit diagram of another embodiment of the present invention; and
fig. 5 is a schematic circuit diagram of another embodiment of the present invention.
Detailed Description
As shown in fig. 1, the present invention provides a schematic block diagram of a voltage regulator circuit. The voltage stabilizing circuit comprises: the device comprises an adjusting unit 1, a sampling unit 2 and a feedback control unit 3. The adjusting unit 1 receives an input voltage Vin, and adjusts and outputs an output voltage Vout. The sampling unit 2 samples and outputs a sampling voltage signal from the output voltage Vout. The feedback control unit 3 controls the adjusting unit to adjust the voltage according to the sampling voltage signal of the sampling unit, so as to stabilize the output voltage.
As shown in fig. 2, the feedback control unit 3 specifically includes an inverter circuit 31 and a control circuit 32, where the inverter circuit 31 is configured to output a voltage signal with a variation opposite to that of the sampling voltage signal according to the input sampling voltage signal. The control circuit 32 outputs a control signal to the adjustment unit for adjusting the output voltage according to the voltage signal from the inverter circuit.
The utility model discloses in, come the adjustment unit with adjustment output voltage through the control of feedback control unit to reach the purpose of steady voltage. The present invention will be described in detail with reference to the following examples.
As shown in FIG. 3, the voltage regulator circuit shown in FIG. 3 includes three transistors, wherein the first transistor Q0The PNP transistor is used as a regulation unit, and an emitter of the PNP transistor is connected with an input voltage Vin, and a collector of the PNP transistor is connected with an output voltage Vout. Its base electrode passes through the resistor R0And a third transistor Q1Collector electrode connection of, Q1Is an NPN type transistor. Third transistor Q1As a control circuit, its base and a second transistor Q2Is connected to the collector of the collector and is connected to the collector via a resistor R1The input terminal Vin is connected. Second transistor Q2And as a free resistor R2、R3The sampling points of the sampling cells being connected in series, i.e. the second transistor Q2Is connected with the connection point of the two resistors. The output voltage Vout is connected to one end of the series circuit, and the ground is connected to the other end. Second transistor Q2And a third transistor Q1The emitter of (2) is grounded.
In normal operation, the sampling series circuit takes out the voltage from the output terminal Vout as the second transistor Q2Providing a base voltage and current, the second transistor Q2 is in an amplified state. Considering that the resistance between the base and the emitter of the third transistor Q1 is very large, the collector of the second transistor Q2 may be directly connected withThe base of the third transistor Q1 is connected such that the base current is supplied directly to the third transistor Q1; of course, in order to obtain a wider adjustment range, a current limiting resistor Rx may be connected in series between the collector of the second transistor Q2 and the base of the third transistor Q1, and then a base current may be supplied to the third transistor Q1, so that the third transistor Q1 is ensured to be in an amplification state regardless of whether the current limiting resistor Rx is added, as shown in fig. 4.
Suppose that the third transistor Q is1Is n, the third transistor Q1Has a collector current n times that of the base as the first transistor Q0Is sufficient to make the first transistor Q0And is in a saturated conducting state. At this time, the first transistor Q0Like an electronic switch, the input and output are turned on.
With respect to current limiting resistor RXThe selection principle of the resistance value range is as follows: second transistor Q2Collector voltage of (1) through a resistor RXAfter enable third transistor Q1The amplification state is turned on. Typically in the range of (5K-50K), i.e. an adjustable amplitude is guaranteed.
When the input voltage Vin fluctuates and becomes high, the instantaneous output rises, the current in the sampling circuit rises, the voltage of the sampling point rises, and the second transistor Q is caused2And thus the collector current, resulting in the second transistor Q2Tube voltage drop U ofCELowering, i.e. lowering the collector potential, results in a third transistor Q1Is reduced, and correspondingly, the third transistor Q1Is reduced, i.e. the first transistor Q0The base current of (2) is reduced, the first transistor Q0Tube voltage drop U ofCEAnd (4) increasing. Thus, the output voltage Vout can be kept constant. That is, by adjusting the first transistor Q0The tube voltage drop of (2) counteracts the fluctuation of the output voltage.
Similarly, when the input voltage Vin becomes low, the current and voltage variation processes in the circuit are opposite to the above processes, and are not described herein again.
As can be seen from the above description, the second transistor Q2The voltage variation of the collector is opposite to the variation of the sampled voltage signal, i.e. the second transistor Q2The output is a circuit with the opposite variation of the sampling signal. By the signal with the opposite variation, the third transistor Q1In response to the first transistor Q0Since the collector current variation of the transistor is inversely proportional to the voltage variation of the tube voltage drop, the first transistor Q can be controlled0The tube voltage drop variation is opposite to the variation of the sampling signal, thereby achieving the functions of voltage regulation and voltage stabilization.
In this embodiment, the transistors may be replaced by NPN transistors or PNP transistors. As shown in fig. 5.
In the present invention, according to the circuit characteristics, the third transistor Q is ignored because the current is too small1When the base and the emitter of the voltage stabilizing circuit are in the branch current, the main current of the whole voltage stabilizing circuit is as follows:
Icc＝I1+I23,
as shown in fig. 2, wherein:
(1)I1＝(Vin-VQ2CE)/R1 (2)I23＝Vout/(R2+R3)
if Vin is 4-7V, and when R1R 2R 3Mohm, R3R 450Kohm, R0When the voltage-stabilizing output voltage is about 3.3 volts when 50Kohm is reached, the working current of the whole voltage-stabilizing circuit can be as low as 2-3uA, that is, compared with the prior art, the power consumption is reduced by tens of times, and if the resistance value is increased in the same proportion, the power consumption can be further reduced. In the specific use process, the device model can be adjusted correspondingly according to different device models.
Because the utility model provides a voltage stabilizing circuit scale is little, all electronic components in the unit number, obviously have the advantage of low-power consumption, therefore be the power supply device of low-power consumption product ideal, like intelligent drinking cup, hydrogen-rich water cup and other contain the drinking cup of electronic function, car key, remote controller, laser pen, portable flashlight, portable player, recording pen (ware), little and exquisite low-power consumption standby products such as miniature camera head, specially adapted button cell power supply system.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included within the protection scope of the present invention.
Claims (8)
1. A voltage regulator circuit, comprising:
the input end of the adjusting unit is a voltage input end, the output end of the adjusting unit is a voltage output end, and the adjusting unit comprises an adjusting control end;
the sampling unit is connected with the voltage output end and samples and outputs a sampling voltage signal from the output voltage;
it is characterized by also comprising:
and the input end of the feedback control unit is connected with the sampling unit, the output end of the feedback control unit is connected with the adjustment control end of the adjustment unit, and the adjustment unit adjusts the voltage according to the control signal of the feedback control unit so as to stabilize the output voltage.
2. The voltage regulator circuit of claim 1, wherein the feedback control unit comprises:
the inverting circuit is connected with the sampling unit and used for outputting a voltage signal with the variation opposite to that of the sampling voltage signal according to the input sampling voltage signal; and
and the control circuit is connected with the phase inverting circuit and outputs a control signal to the adjustment control end of the adjustment unit according to the voltage signal from the phase inverting circuit.
3. The voltage regulator circuit of claim 2 wherein the regulation unit includes a first transistor having an emitter or collector that receives the input voltage as an input, a collector or emitter that receives the voltage output, and a base that receives the control signal from the control circuit as the regulation control.
4. The voltage regulator circuit of claim 3 wherein the inverting circuit includes a second transistor, and the control circuit includes a third transistor; wherein,
the base electrode of the second transistor serves as an input end to receive a sampling voltage signal of a sampling unit, and the collector electrode of the second transistor serves as an output end to output a voltage signal with the variation opposite to that of the sampling voltage signal to the base electrode of the third transistor;
the base of the third transistor receives the voltage signal which is sent by the collector of the second transistor and has the opposite variation of the sampled voltage signal, and the current signal with the opposite variation of the current to the variation of the sampled voltage is provided to the base of the first transistor through the collector.
5. The voltage regulator circuit of claim 4 wherein the control circuit further comprises a current limiting resistor coupled between the collector of the third transistor and the base of the first transistor.
6. The voltage regulation circuit of claim 4 or 5 wherein the second and third transistors are the same type of transistor, the first transistor being of the opposite type to the second and third transistors.
7. The voltage regulator circuit of claim 6 wherein the transistor is an NPN transistor or a PNP transistor.
8. The voltage regulator circuit of claim 6 wherein the sampling unit includes a plurality of series resistors, a sampled voltage signal being output at the series resistor connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620563264.2U CN205680030U (en) | 2016-06-13 | 2016-06-13 | Low-power consumption mu balanced circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620563264.2U CN205680030U (en) | 2016-06-13 | 2016-06-13 | Low-power consumption mu balanced circuit |
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| CN205680030U true CN205680030U (en) | 2016-11-09 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105912062A (en) * | 2016-06-13 | 2016-08-31 | 深圳市瀚索科技开发有限公司 | Low-power-consumption voltage stabilizing circuit and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105912062A (en) * | 2016-06-13 | 2016-08-31 | 深圳市瀚索科技开发有限公司 | Low-power-consumption voltage stabilizing circuit and method |
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Granted publication date: 20161109 |
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| CF01 | Termination of patent right due to non-payment of annual fee |