CN209327890U - A kind of voltage regulator circuit, power supply and electrical equipment - Google Patents
A kind of voltage regulator circuit, power supply and electrical equipment Download PDFInfo
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- CN209327890U CN209327890U CN201822205901.0U CN201822205901U CN209327890U CN 209327890 U CN209327890 U CN 209327890U CN 201822205901 U CN201822205901 U CN 201822205901U CN 209327890 U CN209327890 U CN 209327890U
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Abstract
The utility model relates to a kind of voltage regulator circuits, power supply and electrical equipment, the voltage regulator circuit includes LDO module, output voltage detection module, reference voltage output module and voltage comparison module, the Input voltage terminal of LDO module is for connecting power supply device, the output voltage terminal of LDO module is arranged in output voltage detection module, for detecting the output voltage of LDO module, output voltage detection module connects the input terminal of voltage comparison module with the output end of reference voltage output module, the end GND of the output end connection LDO module of voltage comparison module, the error for the reference voltage that the actual output voltage and reference voltage output module detected according to output voltage detection module provides accordingly adjusts the output voltage of LDO module.The utility model reduces the output voltage fluctuation of LDO module, improves the accuracy of LDO module output voltage according to the output voltage of LDO module and the corresponding output voltage for adjusting LDO module of the difference of reference voltage.
Description
Technical field
The utility model relates to a kind of voltage regulator circuit, power supply and electrical equipments, belong to power electronics field.
Background technique
Electrical equipment, such as sensor, generally by low-dropout regulator (the also referred to as low pressure on electronic control unit ECU
Difference linear constant voltage regulator, referred to as LDO) power supply is provided.But only by LDO output voltage, voltage output is not smart enough
Really, it and is affected by temperature, output voltage easily occur the case where larger fluctuation, and then causes sensor power supply unstable, output
Signal is affected.
Utility model content
The purpose of the utility model is to provide a kind of voltage regulator circuit, power supply and electrical equipments, for only being mentioned by LDO
Power supply source causes the problem of output voltage is inaccurate, and output voltage is easy to appear fluctuation.
In order to solve the above technical problems, the utility model provides a kind of voltage regulator circuit, including LDO module, output voltage
Detection module, reference voltage output module and voltage comparison module, the Input voltage terminal of the LDO module is for connecting charger
The output voltage terminal of the LDO module is arranged in part, the output voltage detection module, for detecting the output electricity of LDO module
Pressure, the output voltage detection module connect the input of the voltage comparison module with the output end of reference voltage output module
End, the output end of the voltage comparison module connect the end GND of the LDO module, are detected according to output voltage detection module
Actual output voltage and reference voltage output module provide reference voltage error accordingly adjust LDO module output electricity
Pressure.
In order to solve the above technical problems, the utility model additionally provides a kind of power supply, including voltage regulator circuit and use
In providing the power supply device of input voltage, the voltage regulator circuit includes that LDO module, output voltage detection module, reference voltage are defeated
Module and voltage comparison module out, the Input voltage terminal of the LDO module connect the power supply device, the output voltage detection
The output voltage terminal of the LDO module is arranged in module, for detecting the output voltage of LDO module, the output voltage detection
Module connects the input terminal of the voltage comparison module with the output end of reference voltage output module, the voltage comparison module
Output end connects the end GND of the LDO module, the actual output voltage detected according to output voltage detection module and benchmark electricity
The error for the reference voltage that pressure output module provides accordingly adjusts the output voltage of LDO module.
In order to solve the above technical problems, the utility model additionally provide a kind of electrical equipment, including electrical equipment ontology with
And the power supply for powering for electrical equipment ontology, the power supply include voltage regulator circuit and input electricity for providing
The power supply device of pressure, the voltage regulator circuit include LDO module, output voltage detection module, reference voltage output module and voltage
Comparison module, the Input voltage terminal of the LDO module connect the power supply device, and the output voltage detection module is arranged in institute
The output voltage terminal for stating LDO module, for detecting the output voltage of LDO module, the output voltage detection module and benchmark electricity
The output end of pressure output module connects the input terminal of the voltage comparison module, and the output end of the voltage comparison module connects institute
The end GND of LDO module is stated, the actual output voltage detected according to output voltage detection module and reference voltage output module mention
The error of the reference voltage of confession accordingly adjusts the output voltage of LDO module, and the output voltage terminal of the LDO module is for being electrically connected institute
State electrical equipment ontology.
The beneficial effects of the utility model are: detected by the output voltage to LDO module, and will test
The output voltage of LDO module is compared with reference voltage, according to the difference between the output voltage and reference voltage of LDO module
The corresponding output voltage for adjusting LDO module mentions so that the output voltage of LDO module, which is less prone to, fluctuates larger situation
The high accuracy of LDO module output voltage.
As the further improvement of circuit, power supply and equipment, in order to provide accurate reference voltage, the reference voltage is defeated
Module is that a reference voltage exports branch out, and one end of the reference voltage output branch connects the input of the LDO module
Voltage end, other end ground connection, the reference voltage output branch road are provided with current-limiting resistance and source of stable pressure device, the source of stable pressure
The pressure stabilizing end of device is the output end of the reference voltage output module.
As the further improvement of circuit, power supply and equipment, in order to which the output voltage to LDO module is accurately detected,
The output voltage detection module is a partial pressure branch, and one end of the partial pressure branch connects the output electricity of the LDO module
Pressure side, other end ground connection, partial pressure branch road string are equipped at least two divider resistances, and the partial pressure end divided in branch is described
The output end of output voltage detection module.
As the further improvement of circuit, power supply and equipment, electric current flows backward the LDO mould into LDO module in order to prevent
The output voltage terminal of block is provided with the diode for preventing electric current from reversely flowing into LDO module.
As the further improvement of circuit, power supply and equipment, in order to improve LDO module output voltage detected value it is accurate
Property, each divider resistance of partial pressure branch road is Low Drift Temperature resistance.
Detailed description of the invention
Fig. 1 is the structural block diagram of the utility model voltage regulator circuit；
Fig. 2 is the circuit diagram of the utility model voltage regulator circuit.
Specific embodiment
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and specifically
The present invention will be further described in detail for embodiment.
Voltage regulator circuit embodiment:
A kind of voltage regulator circuit is present embodiments provided, corresponding structural block diagram is as shown in Figure 1, include LDO module, output
Voltage detection module, reference voltage output module and voltage comparison module.Wherein, the Input voltage terminal Vin of LDO module is for connecting
Power supply device is connect, the output voltage terminal Vout of LDO module is arranged in output voltage detection module, for detecting the defeated of LDO module
Voltage out, output voltage detection module connect the input terminal of voltage comparison module with the output end of reference voltage output module, electricity
Press the end GND of the output end connection LDO module of comparison module, the actual output voltage detected according to output voltage detection module
The error of the reference voltage provided with reference voltage output module accordingly adjusts the output voltage of LDO module.
Specifically, the reference voltage is defeated as shown in Fig. 2, reference voltage output module is that a reference voltage exports branch
The Input voltage terminal Vin of one end connection LDO module U2 of out branch, other end ground connection, the Input voltage terminal Vin of LDO module U2
For connecting power supply device.Reference voltage output branch road is provided with current-limiting resistance R1 and source of stable pressure device U1, current-limiting resistance
R1 plays the role of flow-limiting voltage-stabilizing, and the pressure stabilizing end of source of stable pressure device U1 is the output end of benchmark voltage output module.The benchmark
Voltage output module is influenced smaller by temperature change, accurate reference voltage can be provided, to guarantee that LDO module U2's is steady
Fixed output.
As other embodiments, in the case where guaranteeing to export stable reference voltage, reference voltage output module
Other circuits existing in the prior art or module can be used, such as ready-made reference voltage chip can be used.
Output voltage detection module is a partial pressure branch, divides the output voltage of one end connection LDO module U2 of branch
Hold Vout, other end ground connection.The partial pressure branch road string is equipped with the divider resistance R2 and divider resistance R3 for playing partial pressure effect, partial pressure
The series connection point of resistance R2 and divider resistance R3 constitute the partial pressure end in the partial pressure branch, and the partial pressure end is as entire output voltage
The output end of detection module.In order to improve voltage detecting precision, temperature change is avoided to examine the output voltage Vdd of LDO module U2
The influence of measured value, to guarantee that LDO module U2's stablizes output, divider resistance R2 and divider resistance R3 are Low Drift Temperature resistance.For
Prevent electric current from flowing backward into LDO module U2, to realize the counnter attack connection function of output voltage, the output voltage terminal of LDO module U2
Vout is provided with the diode D1 for preventing electric current from reversely flowing into LDO module U2.For the output voltage to LDO module U2
Vdd is filtered, and the output voltage terminal Vout of LDO module U2 is also connected with ground capacity C1.
As other embodiments, dividing branch and going here and there the number of the divider resistance set on the road may be integer greater than 2,
It can according to need and be configured, detected for the output voltage Vdd to LDO module U2.Certainly, which detects
Module is also possible to other voltage detection devices existing in the prior art, such as can be voltage sensor.
Voltage comparison module includes an operational amplifier U3, and the non-inverting input terminal of operational amplifier U3 connects reference voltage
The output end of output module, inverting input terminal connect the output end of output voltage detection module, and output end connects LDO module
The end GND of U2.
The working principle of above-mentioned voltage regulator circuit are as follows: output voltage detection module detects the output voltage of LDO module,
And the output voltage values that will test are conveyed to voltage comparison module.Voltage comparison module by the output voltage values detected with
The reference voltage of reference voltage output module output is compared, and exports mould when the output voltage of LDO module is greater than reference voltage
When the reference voltage of block output, then the voltage of voltage comparison module output reduces, so that the output voltage of LDO module is controlled
It reduces；When the output voltage of LDO module is less than the reference voltage of reference voltage output module output, then voltage comparison module is defeated
Voltage out increases, so that the controlled raising of the output voltage of LDO module.
It should be noted that two input terminals of operational amplifier U3 and output voltage detection module and reference voltage export
Connection relationship between module is determined by the integrated circuit of LDO inside modules.As other embodiments, for reality
The non-inverting input terminal of operational amplifier U3 can also be connected output voltage and detect mould by the voltage regulation result of existing above-mentioned voltage regulator circuit
The output end of block, inverting input terminal connect the output end of benchmark voltage output module.
Above-mentioned voltage regulator circuit is avoided by increasing some simple common electronic devices on the basis of LDO module
Increased costs caused by new device are purchased, by reference voltage, the output voltage of Low Drift Temperature resistance adjustment LDO module, can be realized
Small, output voltage is influenced with anti-reverse power connection, by temperature change and fluctuates power supply small, that output voltage accuracy is high, is kept away
Exempt from influence of the temperature change to output voltage, solved the problems, such as the temperature drift of LDO module, ensure that output voltage in wide temperature range
Stablize, the sensor for being suitble to required precision high, which is powered, to be used, or in temperature change compared with the sensor power supply under overall situation.
Power supply embodiment:
A kind of power supply is present embodiments provided, including voltage regulator circuit and for providing the charger of input voltage
Part, the power supply device is for being electrically connected voltage regulator circuit, for providing input power to voltage regulator circuit.Wherein, the power supply device in addition to
Except controller (such as ECU), it can also be other voltage source devices, such as can be direct-flow storage battery.Due to pressure stabilizing electricity
The specific structure and working principle on road are described in detail in voltage regulator circuit embodiment, and details are not described herein again.
Electrical equipment embodiment:
Present embodiments provide a kind of electrical equipment, including electrical equipment ontology and for supplying for the electrical equipment ontology
The power supply of electricity, the electrical equipment ontology can be the electrical equipments such as sensor.Since the power supply is above-mentioned
It is described in power supply embodiment, details are not described herein again.
Finally it should be noted that above embodiments are merely to illustrate the technical solution of the utility model rather than protect to it
The limitation of range, although the application is described in detail referring to above-described embodiment, those of ordinary skill in the art
It should be appreciated that those skilled in the art can still carry out various changes after reading the application to the specific embodiment of application, repair
Change perhaps equivalent replacement but these change, modification or equivalent replacement, the claims of the utility model it
It is interior.
Claims (10)
1. a kind of voltage regulator circuit, which is characterized in that including LDO module, output voltage detection module, reference voltage output module and
Voltage comparison module, the Input voltage terminal of the LDO module is for connecting power supply device, the output voltage detection module setting
In the output voltage terminal of the LDO module, for detecting the output voltage of LDO module, the output voltage detection module and base
The output end of quasi- voltage output module connects the input terminal of the voltage comparison module, and the output end of the voltage comparison module connects
The end GND of the LDO module is connect, the actual output voltage detected according to output voltage detection module and reference voltage export mould
The error for the reference voltage that block provides accordingly adjusts the output voltage of LDO module.
2. voltage regulator circuit according to claim 1, which is characterized in that the reference voltage output module is a benchmark electricity
One end of pressure output branch, the reference voltage output branch connects the Input voltage terminal of the LDO module, and the other end is grounded,
The reference voltage output branch road is provided with current-limiting resistance and source of stable pressure device, and the pressure stabilizing end of the source of stable pressure device is described
The output end of reference voltage output module.
3. voltage regulator circuit according to claim 1 or 2, which is characterized in that the output voltage detection module is one point
Branch is pressed, one end of the partial pressure branch connects the output voltage terminal of the LDO module, other end ground connection, the partial pressure branch
Upper string is equipped at least two divider resistances, divides the output end that the partial pressure end in branch is the output voltage detection module.
4. voltage regulator circuit according to claim 1 or 2, which is characterized in that the output voltage terminal of the LDO module is provided with
For preventing electric current from reversely flowing into the diode of LDO module.
5. voltage regulator circuit according to claim 3, which is characterized in that each divider resistance of partial pressure branch road is Low Drift Temperature
Resistance.
6. a kind of power supply, including voltage regulator circuit and for providing the power supply device of input voltage, which is characterized in that described
Voltage regulator circuit includes LDO module, output voltage detection module, reference voltage output module and voltage comparison module, the LDO mould
The Input voltage terminal of block connects the power supply device, and the output electricity of the LDO module is arranged in the output voltage detection module
Pressure side, for detecting the output voltage of LDO module, the output end of the output voltage detection module and reference voltage output module
The input terminal of the voltage comparison module is connected, the output end of the voltage comparison module connects the end GND of the LDO module,
The mistake for the reference voltage that the actual output voltage and reference voltage output module detected according to output voltage detection module provides
The poor corresponding output voltage for adjusting LDO module.
7. power supply according to claim 6, which is characterized in that the reference voltage output module is a benchmark electricity
One end of pressure output branch, the reference voltage output branch connects the Input voltage terminal of the LDO module, and the other end is grounded,
The reference voltage output branch road is provided with current-limiting resistance and source of stable pressure device, and the pressure stabilizing end of the source of stable pressure device is described
The output end of reference voltage output module.
8. power supply according to claim 6 or 7, which is characterized in that the output voltage detection module is one point
Branch is pressed, one end of the partial pressure branch connects the output voltage terminal of the LDO module, other end ground connection, the partial pressure branch
Upper string is equipped at least two divider resistances, divides the output end that the partial pressure end in branch is the output voltage detection module.
9. power supply according to claim 6 or 7, which is characterized in that the output voltage terminal of the LDO module is provided with
For preventing electric current from reversely flowing into the diode of LDO module.
10. a kind of electrical equipment, the power supply including electrical equipment ontology and for powering for electrical equipment ontology is special
Sign is that the power supply is power supply described in any one of claim 6-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822205901.0U CN209327890U (en) | 2018-12-25 | 2018-12-25 | A kind of voltage regulator circuit, power supply and electrical equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822205901.0U CN209327890U (en) | 2018-12-25 | 2018-12-25 | A kind of voltage regulator circuit, power supply and electrical equipment |
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| Publication Number | Publication Date |
|---|---|
| CN209327890U true CN209327890U (en) | 2019-08-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822205901.0U Active CN209327890U (en) | 2018-12-25 | 2018-12-25 | A kind of voltage regulator circuit, power supply and electrical equipment |
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| Country | Link |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021135349A1 (en) * | 2019-12-31 | 2021-07-08 | 圣邦微电子（北京）股份有限公司 | Low-dropout linear regulator and control circuit thereof |
| CN113176801A (en) * | 2021-04-13 | 2021-07-27 | 合肥松豪电子科技有限公司 | Circuit for preventing LDO circuit from reversely leaking electricity |
| CN114489216A (en) * | 2022-04-14 | 2022-05-13 | 深圳市赛元微电子有限公司 | Protection circuit applied to LDO (low dropout regulator) |
-
2018
- 2018-12-25 CN CN201822205901.0U patent/CN209327890U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021135349A1 (en) * | 2019-12-31 | 2021-07-08 | 圣邦微电子（北京）股份有限公司 | Low-dropout linear regulator and control circuit thereof |
| CN113176801A (en) * | 2021-04-13 | 2021-07-27 | 合肥松豪电子科技有限公司 | Circuit for preventing LDO circuit from reversely leaking electricity |
| CN114489216A (en) * | 2022-04-14 | 2022-05-13 | 深圳市赛元微电子有限公司 | Protection circuit applied to LDO (low dropout regulator) |
| CN114489216B (en) * | 2022-04-14 | 2022-06-24 | 深圳市赛元微电子有限公司 | Protection circuit applied to LDO (low dropout regulator) |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 450061 Yudao Road, Guancheng District, Zhengzhou City, Henan Province Patentee after: Yutong Bus Co.,Ltd. Address before: 450061 Yudao Road, Guancheng District, Zhengzhou City, Henan Province Patentee before: ZHENGZHOU YUTONG BUS Co.,Ltd. |
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| CP01 | Change in the name or title of a patent holder |