CN106533142B - Anti-backflow circuit - Google Patents
Anti-backflow circuit Download PDFInfo
- Publication number
- CN106533142B CN106533142B CN201610906068.5A CN201610906068A CN106533142B CN 106533142 B CN106533142 B CN 106533142B CN 201610906068 A CN201610906068 A CN 201610906068A CN 106533142 B CN106533142 B CN 106533142B
- Authority
- CN
- China
- Prior art keywords
- circuit
- resistor
- controllable switch
- detection
- current
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
- H02M1/32—Means for protecting converters other than automatic disconnection
-
- 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
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0009—Devices or circuits for detecting current in a converter
Abstract
The utility model relates to the field of power supply circuits, in particular to a backflow prevention circuit. The device comprises a detection circuit, a comparison circuit and a controllable switch; the detection circuit is arranged between the source power supply and the power conversion circuit, and two input ends of the comparison circuit are respectively connected with two ends of the detection circuit; the output of the comparison circuit is connected with the control end of the controllable switch; one end of the controllable switch is connected with the output end of the backflow prevention circuit, and the other end of the controllable switch is grounded. The anti-backflow circuit for the voltage module of the voltage analyzer mainly detects the current direction on the detection circuit, the current flows forward, and no action is generated by the anti-backflow circuit. When the upper current is reversed, the current is conducted under the action of the operational amplifier to release the reversed current to the ground, so that the circuit is effectively prevented from being damaged when the reversed current occurs to the power supply power conversion module.
Description
Technical Field
The utility model relates to the field of power supply testing, in particular to a backflow prevention circuit.
Background
Typically, in performing dc power related tests, engineers must pool and configure multiple instruments to accomplish dc power and measurement tasks. When performing these complex tasks, multiple test instruments may be connected simultaneously, increasing the risk of error; for this reason, engineers may choose to automatically test far more complex than manual testing, but automated testing tasks, while reducing human error, further add to the effort of writing and debugging programs to research and development engineers that have already been overloaded with work.
The appearance of the DC power supply analyzer avoids the use of multiple devices by engineers and complicated debugging before testing. The power analyzer can measure the current flowing into the DUT through its built-in current dynamic measurement capability without the need for such sensors as current probes and shunts; the direct current power supply analyzer does not need to develop control and measurement programs, all functions and measurement are integrated in the same equipment, and a PC, a driver and software are not needed, which is equivalent to reducing the workload related to setting by more than 90%; the user can complete the direct current power supply and measurement test task only in 2 days by using the independent test equipment, and can complete the test in 5 minutes by using the direct current power supply analyzer.
In general, a universal meter module, an oscilloscope module, an arbitrary waveform generation module, a data recording module and a plurality of direct current power supply modules are integrated in the direct current power supply analyzer, wherein the plurality of direct current power supply modules with different output powers are certainly one of the most core devices of the power supply analyzer, and in some cases, a current backflow situation occurs in a power conversion circuit in the power supply module, and serious current backflow can cause device damage.
Disclosure of Invention
The utility model aims to provide a power module backflow preventing circuit for processing backflow current when current flows backward, aiming at the situation that current backflow occurs in a power conversion circuit of each power module in a direct current power supply analyzer.
In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:
an anti-backflow circuit comprises a detection circuit, a comparison circuit and a controllable switch; the detection circuit is arranged between the source power supply and the power conversion circuit, and two input ends of the comparison circuit are respectively connected with two ends of the detection circuit; the output of the comparison circuit is connected with the control end of the controllable switch; one end of the controllable switch is connected with the output end of the backflow prevention circuit, and the other end of the controllable switch is grounded.
Specifically, the detection circuit comprises a detection resistor; the comparison circuit comprises an operational amplifier which,
the first end of the detection resistor is connected with the power input end; the second end of the detection resistor is connected with the power conversion circuit through a first inductor and a second inductor which are connected in parallel;
the second end of the detection resistor is connected with the first input end of the operational amplifier through a first resistor and a second resistor which are sequentially connected in series; the first end of the detection resistor is connected with the second input end of the operational amplifier through a third resistor.
The output end of the operational amplifier is connected with the control end of the controllable switch through a fourth resistor;
the source electrode of the controllable switch is simultaneously connected with the second end of the detection resistor, and the first inductor and the second inductor which are connected in parallel through the fifth resistor.
The drain electrode of the controllable switch is grounded through a sixth resistor; the first end of the detection resistor is grounded through a diode, a seventh resistor, an eighth resistor and a ninth resistor which are connected in series.
The first input end of the operational amplifier is also connected with the source electrode of the controllable switch through a first capacitor, a second capacitor and a tenth resistor which are sequentially connected in series; the second capacitor and the tenth resistor connected in series are also connected in parallel with the eleventh resistor.
In summary, due to the adoption of the technical scheme, the beneficial effects of the utility model are as follows:
the anti-backflow circuit for the voltage module of the voltage analyzer mainly detects the current direction on the detection circuit, the current flows forward, and no action is generated by the anti-backflow circuit. When the upper current is reversed, the current is conducted under the action of the operational amplifier to release the reversed current to the ground, so that the circuit is effectively prevented from being damaged when the reversed current occurs to the power supply power conversion module.
Drawings
Fig. 1 is a schematic structural view of the present utility model.
Fig. 2 is a circuit diagram of an embodiment of the present utility model.
Detailed Description
The present utility model will be described in detail with reference to the accompanying drawings.
The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.
Example 1: as shown in fig. 1, the present embodiment provides a backflow prevention circuit, which includes a detection circuit 1, a comparison circuit 2, and a controllable switch 3; the detection circuit 1 is arranged between the source power supply Vss and the power conversion circuit, and two input ends of the comparison circuit 2 are respectively connected with two ends of the detection circuit 1; the output of the comparison circuit 2 is connected with the control end of the controllable switch 3; one end of the controllable switch 3 is connected with the output end of the backflow prevention circuit, and the other end of the controllable switch is grounded.
Example 2: as shown in fig. 2, in this embodiment, the detection circuit includes a detection resistor; the comparison circuit comprises an operational amplifier;
the first end of the detection resistor R266 is connected with the power input end; the second end of the detection resistor R266 is connected with a first controllable switch, a third controllable switch, a fifth controllable switch and a seventh controllable switch in the control circuit through a first inductor L11 and a second inductor L12 which are connected in parallel;
the second end of the detection resistor R266 is connected with the first input end of the operational amplifier through a first resistor R268 and a second resistor R271 which are sequentially connected in series; the first end of the detection resistor R266 is connected with the second input end of the operational amplifier through a third resistor R273.
The output end of the operational amplifier is connected with the control end of the controllable switch Q20 through a fourth resistor R272;
the source of the controllable switch Q20 is simultaneously connected with the second end of the detection resistor R266 and the first inductor L11 and the second inductor L12 connected in parallel through the fifth resistor R269.
The drain electrode of the controllable switch Q20 is grounded through a sixth resistor R274; the first end of the detection resistor R266 is further grounded through a diode D47 and a seventh resistor R276, an eighth resistor R277, and a ninth resistor R278 connected in series.
The first input end of the operational amplifier U34 is also connected with the source electrode of the controllable switch Q20 through a first capacitor C198, a second capacitor C199 and a tenth resistor R270 which are sequentially connected in series; the second capacitor C199 and the tenth resistor R270 connected in series are also connected in parallel with the eleventh resistor R267.
The anti-backflow circuit mainly detects the direction of current on the detection resistor R266, the current flows forward, and no action is generated by the anti-backflow circuit. When the current on R266 is reversed, Q20 is turned on under the action of op-amp U34 to release the reverse current to ground.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model.
Claims (1)
1. The anti-backflow circuit is characterized by comprising a detection circuit, a comparison circuit and a controllable switch; the detection circuit is arranged between the source power supply and the power conversion circuit, and two input ends of the comparison circuit are respectively connected with two ends of the detection circuit; the output of the comparison circuit is connected with the control end of the controllable switch; one end of the controllable switch is connected with the output end of the backflow prevention circuit, and the other end of the controllable switch is grounded; the detection circuit comprises a detection resistor; the comparison circuit comprises an operational amplifier which,
the first end of the detection resistor is connected with the power input end; the second end of the detection resistor is connected with the power conversion circuit through a first inductor and a second inductor which are connected in parallel; the second end of the detection resistor is connected with the first input end of the operational amplifier through a first resistor and a second resistor which are sequentially connected in series; the first end of the detection resistor is connected with the second input end of the operational amplifier through a third resistor;
the output end of the operational amplifier is connected with the control end of the controllable switch through a fourth resistor;
the source electrode of the controllable switch is connected with the power conversion circuit through a fifth resistor, a first inductor and a second inductor which are connected in parallel; the drain electrode of the controllable switch is grounded through a sixth resistor;
the first end of the detection resistor is grounded through a diode, a seventh resistor, an eighth resistor and a ninth resistor which are connected in series;
the first input end of the operational amplifier is also connected with the source electrode of the controllable switch through a first capacitor, a second capacitor and a tenth resistor which are sequentially connected in series; the second capacitor and the tenth resistor connected in series are also connected in parallel with the eleventh resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610906068.5A CN106533142B (en) | 2016-10-18 | 2016-10-18 | Anti-backflow circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610906068.5A CN106533142B (en) | 2016-10-18 | 2016-10-18 | Anti-backflow circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106533142A CN106533142A (en) | 2017-03-22 |
| CN106533142B true CN106533142B (en) | 2023-05-26 |
Family
ID=58332259
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610906068.5A Active CN106533142B (en) | 2016-10-18 | 2016-10-18 | Anti-backflow circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106533142B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107069902A (en) * | 2017-06-22 | 2017-08-18 | 安徽锐能科技有限公司 | power supply circuit for battery management system |
| CN109167413A (en) * | 2018-10-11 | 2019-01-08 | 佛山职业技术学院 | A kind of anti-reverse and anti-back flow circuit of battery charging |
| JP7151574B2 (en) * | 2019-03-20 | 2022-10-12 | 横河電機株式会社 | Power system and power supply |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103294098A (en) * | 2012-02-29 | 2013-09-11 | 精工电子有限公司 | Voltage regulator |
| CN104965110A (en) * | 2014-10-30 | 2015-10-07 | 深圳市盛弘电气股份有限公司 | Power tube lossless current detection circuit and method |
Family Cites Families (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3446654B2 (en) * | 1999-04-02 | 2003-09-16 | 株式会社村田製作所 | Switching power supply |
| JP4442226B2 (en) * | 2004-01-05 | 2010-03-31 | 富士電機システムズ株式会社 | Synchronous rectifier circuit and power converter |
| JP5145763B2 (en) * | 2007-05-11 | 2013-02-20 | 株式会社リコー | Synchronous rectification type switching regulator |
| CN102053567B (en) * | 2010-10-19 | 2013-03-13 | 北京星网锐捷网络技术有限公司 | Safety power-on time sequence control circuit system |
| CN104205591B (en) * | 2012-02-24 | 2016-10-26 | 三菱电机株式会社 | Power on-off circuit |
| CN103001491A (en) * | 2012-11-19 | 2013-03-27 | 电子科技大学 | Digital frequency jitter circuit |
| CN103904620B (en) * | 2012-12-28 | 2018-09-14 | 南京中兴软件有限责任公司 | A kind of DC supply input counnter attack fills circuit and method |
| CN203331936U (en) * | 2013-05-31 | 2013-12-11 | 佛山肆强科技有限公司 | Decoding circuit for non-halogen lamp serving as automobile lamp |
| CN103715917B (en) * | 2014-01-20 | 2016-06-22 | 电子科技大学 | A kind of capacity voltage dropping circuit |
| CN104092388A (en) * | 2014-06-17 | 2014-10-08 | 昆山弗尔赛能源有限公司 | Synchronous rectifying BOOST circuit with reverse current prevention |
| CN204481679U (en) * | 2015-03-10 | 2015-07-15 | 南京微盟电子有限公司 | A kind of current-limiting circuit of voltage-mode PWM type synchronous boost dc-dc |
| CN105262485B (en) * | 2015-11-13 | 2018-05-04 | 成都前锋电子仪器有限责任公司 | A kind of wideband generative circuit for radio general measuring instrument RF local oscillator circuit |
| CN105244864B (en) * | 2015-11-18 | 2018-03-02 | 四川汇源光通信有限公司 | Counnter attack fills protection circuit |
| CN206060522U (en) * | 2016-10-18 | 2017-03-29 | 成都前锋电子仪器有限责任公司 | A kind of anti-back flow circuit |
-
2016
- 2016-10-18 CN CN201610906068.5A patent/CN106533142B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103294098A (en) * | 2012-02-29 | 2013-09-11 | 精工电子有限公司 | Voltage regulator |
| CN104965110A (en) * | 2014-10-30 | 2015-10-07 | 深圳市盛弘电气股份有限公司 | Power tube lossless current detection circuit and method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106533142A (en) | 2017-03-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106533142B (en) | Anti-backflow circuit | |
| US9696353B2 (en) | Measuring power consumption of circuit component operating in run mode | |
| US11360139B2 (en) | Method for testing a power module | |
| CN105680860B (en) | Improve the circuit and method of microcontroller A/D conversion accuracy | |
| CN101750564A (en) | Multi-core cable tester | |
| CN105629052B (en) | Chip power-consumption real-time detection method | |
| CN103576000A (en) | Inductance test circuit | |
| CN104297619A (en) | Testing device for chip input and output pin | |
| CN104101777A (en) | Power test device | |
| Jeong et al. | Built-in self-test for stability measurement of low dropout regulator | |
| CN106291065B (en) | Voltage sampling circuit | |
| US11668733B2 (en) | Multi-stage current measurement architecture | |
| CN108627551B (en) | Data acquisition system for ERT stumpage flaw detection device and hardware circuit thereof | |
| CN215678646U (en) | Test system of PWM circuit | |
| Janković et al. | Microcontroller power consumption measurement based on PSoC | |
| CN206060522U (en) | A kind of anti-back flow circuit | |
| RU2548577C1 (en) | Stand for inspection, test and analysis of computer power supply units | |
| CN205301547U (en) | Electronic load device with self -learning wave form function | |
| CN206074674U (en) | A kind of voltage sample circuit | |
| CN104090153A (en) | Detection system and detection method of liquid crystal module multi-channel power supply | |
| CN109061524B (en) | Power supply test circuit and method | |
| CN101918851B (en) | Voltage measurement unit with minimized common mode errors | |
| CN206114872U (en) | False load circuit | |
| CN203414549U (en) | Ultra-low power test power meter | |
| CN203909137U (en) | Liquid crystal module group multipath power supply detection system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |