CN109039092B - Voltage detection circuit and bidirectional converter using same - Google Patents
Voltage detection circuit and bidirectional converter using same Download PDFInfo
- Publication number
- CN109039092B CN109039092B CN201811099244.4A CN201811099244A CN109039092B CN 109039092 B CN109039092 B CN 109039092B CN 201811099244 A CN201811099244 A CN 201811099244A CN 109039092 B CN109039092 B CN 109039092B
- Authority
- CN
- China
- Prior art keywords
- voltage
- circuit
- resistor
- detection circuit
- bidirectional converter
- 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
- 230000002457 bidirectional effect Effects 0.000 title claims abstract description 64
- 238000001514 detection method Methods 0.000 title claims abstract description 53
- 238000005070 sampling Methods 0.000 claims abstract description 60
- 238000004804 winding Methods 0.000 claims abstract description 33
- 239000003990 capacitor Substances 0.000 claims description 33
- 239000003381 stabilizer Substances 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 8
- 229910052744 lithium Inorganic materials 0.000 description 6
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 5
- 238000004146 energy storage Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 150000002641 lithium Chemical class 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
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
- 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
- H02M3/33569—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 having several active switching elements
- H02M3/33576—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 having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
- H02M3/33584—Bidirectional converters
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0084—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring voltage only
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
-
- 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
- H02M1/0006—Arrangements for supplying an adequate voltage to the control circuit of converters
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
The invention discloses a voltage detection circuit and a bidirectional converter applying the same, wherein an auxiliary winding of a transformer in the bidirectional converter is used for providing working voltage for a voltage sampling circuit, and output voltage of the bidirectional converter only clamps a voltage division loop of the voltage sampling circuit, so that the voltage sampling circuit obtains information of the output voltage when the bidirectional converter works and feeds back the information to a primary side through an optocoupler for overvoltage control. When the bidirectional converter does not work, the voltage sampling circuit does not work because the auxiliary winding does not work, and the output voltage is only released in the form of leakage current through the diode, so that the energy loss of the voltage sampling circuit on the output side is greatly reduced. The voltage detection circuit can realize overvoltage protection of the output side of the converter when the converter works, greatly reduce energy loss of the output side of the converter when the converter does not work, improve the utilization rate of energy of the output side, improve the performance of the circuit and have higher application value.
Description
Technical Field
The present invention relates to a voltage detection circuit, and more particularly to a voltage detection circuit with extremely low leakage current.
Background
As lithium battery and supercapacitor technologies develop more and more, lithium batteries and supercapacitors are widely used in energy storage systems. Because the single voltages of the lithium battery and the super capacitor are lower, in order to obtain higher voltage and larger energy, a plurality of lithium batteries/super capacitors are required to be combined in series-parallel so as to meet the actual application demands. In practical application, the system is managed in the form of a lithium battery pack or a super capacitor pack, and basically controls the charging/discharging current. Then, in order to improve the utilization rate of the stored energy and to prolong the life of the energy storage system, energy balance needs to be performed between the groups, and voltage needs to be detected in the balancing process, so as to prevent the lithium battery group or the super capacitor group from being in overvoltage danger. Currently, in order to improve the energy utilization rate, an equalization technology in an energy storage system generally adopts a bidirectional converter, and belongs to an active equalization circuit. In the application occasions of part of energy storage systems, especially standby energy storage systems, the output voltage of the bidirectional converter is required to be extremely small in leakage current and not to be over-voltage when the bidirectional converter is in idle load, so that the energy of the output side cannot be released in a heat energy mode due to large leakage current, and the problem that the bidirectional converter cannot be over-voltage damaged when the bidirectional converter is in idle load or hot plug is solved. However, these two requirements cannot be met simultaneously with existing output voltage sampling techniques.
There are some bidirectional converter products on the market, whose output side voltage sampling mode is shown in fig. 1, including a sampling resistor network and an optocoupler feedback network, and when the bidirectional converter is not working (system is needed), the sampling resistor network and the optocoupler feedback network are connected in parallel at the output end, so that the energy of the output side is always consumed, and is released in a thermal mode. Resulting in the energy stored on the output side not being well utilized, reducing the overall performance of the system. The scheme can solve the problem of overvoltage of the output side of the no-load or equalization process when the bidirectional converter works, but can not solve the problem that the bidirectional converter requires extremely small leakage current of the output side when the bidirectional converter does not work.
In summary, when the output voltage of the bidirectional converter is sampled, the existing method is difficult to meet the requirement of system performance, so that the application range of the method is limited.
Disclosure of Invention
In view of the above, the technical problem solved by the invention is to overcome the defects of the prior method, and provide a voltage detection circuit and a bidirectional converter applying the same, which not only can ensure that the bidirectional converter has an overvoltage detection function during normal operation, but also can ensure that the leakage current of the output side of the bidirectional converter is extremely small during non-operation, and can meet the actual application requirements, especially for some demanding standby power occasions.
The technical scheme for solving the technical problems is as follows:
a voltage detection circuit is used for realizing output voltage sampling of a converter and comprises a voltage sampling circuit and an optocoupler feedback circuit;
the voltage sampling circuit comprises a second resistor and a third resistor, one end of the second resistor is used as a voltage sampling end of the voltage sampling circuit, the other end of the second resistor is connected with one end of the third resistor in series, and the other end of the third resistor is used as a negative electrode of a voltage input end of the voltage detection circuit;
the optocoupler feedback circuit is used for processing the sampled voltage signals and then feeding back and outputting the processed voltage signals, and consists of an optocoupler, a fourth resistor, a three-terminal voltage stabilizer and a first capacitor, wherein one end of the fourth resistor is connected with the anode of the optocoupler light-emitting diode, and the cathode of the optocoupler light-emitting diode is connected with the cathode of the three-terminal voltage stabilizer and one end of the first capacitor; the anode of the three-terminal voltage regulator is connected with the cathode of the voltage input end of the voltage detection circuit, and the reference end of the three-terminal voltage regulator and the other end of the first capacitor are connected with the series connection point of the second resistor and the third resistor; the collector and the emitter of the triode of the optocoupler are respectively used as two feedback output ends of the voltage detection circuit;
preferably, the transformer also comprises an auxiliary power supply, a first resistor and a first diode, wherein the auxiliary power supply is composed of an auxiliary winding of a transformer in the converter, a second diode and a second capacitor and is used for providing power supply for the voltage sampling circuit; the same-name end of the auxiliary winding of the transformer is connected with the anode of a second diode, the cathode of the second diode is connected with one end of a second capacitor, and the connection point is used as the positive electrode of an auxiliary power supply and is simultaneously connected with the other end of a fourth resistor and one end of a first resistor; the other end of the second capacitor is connected with an auxiliary winding synonym end of the transformer, and the connection point is used as the negative electrode of an auxiliary power supply and is connected with the negative electrode of the voltage input end of the voltage detection circuit; the other end of the first resistor is connected with the anode of the first diode and one end of the second resistor, and the connection point is the voltage sampling end of the voltage sampling circuit; the cathode of the first diode is used as the positive electrode of the voltage input end of the voltage detection circuit.
The invention also provides a bidirectional converter applying the voltage detection circuit, which comprises a main power circuit and a control and drive circuit; the main power circuit comprises a transformer, wherein the transformer comprises three windings, namely a primary winding, a secondary winding and an auxiliary winding, a control end of the main power circuit is connected with a control end of a control and drive circuit, and a current sampling end of the drive and control circuit is connected with the main power circuit and used for detecting current information of the main power circuit;
preferably, the bidirectional converter further comprises the voltage detection circuit, and two feedback output ends of the voltage detection circuit are respectively connected with two input ends of the control and driving circuit; the positive electrode of the voltage input end of the voltage detection circuit is connected with the positive electrode of the voltage output end of the bidirectional converter, and the negative electrode of the voltage input end of the voltage detection circuit is connected with the negative electrode of the voltage output end of the bidirectional converter;
when the bidirectional converter works, the auxiliary power supply provides power supply voltage for the voltage sampling circuit, the voltage sampling circuit samples the voltage of the voltage output end of the bidirectional converter, the sampled voltage signal is processed and fed back to the control and driving circuit through the optocoupler feedback circuit, and when the sampled output voltage exceeds the set voltage, overvoltage protection is started; when the bidirectional converter is not operated, the voltage detection circuit is not operated, and the voltage output end of the bidirectional converter releases energy by the leakage current of the first diode in the voltage detection circuit.
Preferably, the control and driving circuit is constituted by a control chip.
The scheme provided by the invention has the advantages that the working principle is described in detail in the specific embodiment, and the defect of voltage sampling in the prior art is overcome by integrating the working principle of the invention, and the invention has the beneficial effects that:
(1) The voltage detection circuit can judge the overvoltage signal of the output side excessively accurately and feed back the overvoltage signal to the primary side, so that the output overvoltage protection function is realized;
(2) The voltage detection circuit is applied to the bidirectional converter, and when the bidirectional converter does not work, the output side only consumes the energy of the output side by the extremely small diode leakage current, so that the utilization rate of the energy of the output side is greatly improved.
Drawings
FIG. 1 is a schematic diagram of a prior art voltage sampling circuit;
FIG. 2 is a schematic diagram of a voltage detection circuit according to the present invention;
fig. 3 is a circuit diagram of a bidirectional converter according to the present invention, and is also an application of the voltage detection circuit according to the present invention in a bidirectional converter circuit topology.
Detailed Description
The invention is characterized in that: the auxiliary winding of a transformer in the bidirectional converter is utilized to provide a power supply for the voltage sampling circuit, the voltage of the sampling end of the voltage sampling circuit is clamped at vo+VF through a diode D1 (wherein Vo is the output voltage of the bidirectional converter, VF is the forward conduction voltage drop of the diode D1), so that the sampling of the output voltage of the converter is realized, and a sampling output voltage signal is fed back to the primary side of the bidirectional converter through an optocoupler feedback circuit to control; when the converter does not work due to the system requirement, the voltage detection circuit does not work, and the output side of the converter only discharges by the leakage current of the diode D1 due to the existence of the diode D1, and the leakage current of the diode is generally extremely small (for example, the leakage current of the switching diode BAS16 is 1uA@25 ℃), compared with the existing voltage sampling scheme that the resistor sampling network is directly connected in parallel with the output side, the invention can greatly reduce the energy consumption of the voltage sampling network to the output side and greatly improve the energy utilization rate of the output side.
The present invention will be described below with reference to the drawings and examples. 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 invention.
Fig. 2 is a schematic diagram of a voltage detection circuit according to the present invention, including a transformer auxiliary winding N3, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a diode D1, a diode D2, a capacitor C1, a capacitor C2, an optocoupler U1, and a three-terminal voltage regulator U2, where the connection relationship is: the same-name end of the auxiliary winding N3 of the transformer is connected with the anode of the diode D2, the cathode of the diode D2 is connected with one end of the capacitor C2, the other end of the capacitor C2 is connected with the different-name end of the auxiliary winding N3 of the transformer, the connecting point is also connected with the voltage input end cathode of the voltage detection circuit, the cathode of the diode D2 is also connected with one end of the resistor R4 and one end of the resistor R1, the other end of the resistor R1 is connected with the anode of the light coupler U1 through the anode of the diode D1, the cathode of the light coupler U1 is connected with one end of the capacitor C1 and the cathode of the three-terminal voltage stabilizer U2, the anode of the three-terminal voltage stabilizer U2 is connected with one end of the resistor R3 and the voltage input end cathode of the voltage detection circuit, the other end of the resistor R3 is connected between the resistor R1 and the diode D1 after being connected with the resistor R2 in series, the other end of the resistor C1 and the reference end of the three-terminal voltage stabilizer U1 are connected with the series points of the resistor R2 and the resistor R3, and the collector and emitter of the triode of the light coupler U1 are respectively feedback output ends of the voltage detection circuit.
In the circuit, the diode D2 is a rectifying diode, the capacitor C2 is a filtering capacitor, the capacitor C2 and the diode D2 are used for rectifying and filtering, the transformer auxiliary winding N3 provides a stable power supply for the voltage sampling circuit, the resistor R2 and the resistor R3 are sampling resistors, the connection point of the resistor R1 and the diode D1 is a sampling port of the voltage sampling circuit, one end of the resistor R2 is connected with the sampling port, sampling of output voltage is achieved, and an output voltage signal obtained through sampling is fed back to the feedback output end through the optical coupler U1.
In addition, the invention also provides a bidirectional converter applying the voltage detection circuit, as shown in fig. 3, the bidirectional converter comprises a main power circuit, a control and drive circuit and a voltage detection circuit. The connection relation of each circuit is as follows:
the main power circuit comprises a transformer T1, a resistor R5, capacitors C3-C5 and power tubes Q1-Q4, wherein the transformer T1 comprises a primary winding N1, a secondary winding N2 and an auxiliary winding N3, the auxiliary winding N3 is an auxiliary winding in the voltage detection circuit, and one end of the capacitor C3 is connected to the synonym end of the primary winding N1 and is used as a positive electrode vin+ of a voltage input end of the bidirectional converter for receiving input voltage; the other end of the capacitor C3 is connected with the drain electrode of the power tube Q1; the source electrode of the power tube Q1 is connected with the homonymous end of the primary winding N1 and is simultaneously connected with the drain electrode of the power tube Q2; the source electrode of the power tube Q2 is connected with one end of the resistor R5 and is used as a current sampling port Vi of the control and drive circuit for current sampling of the bidirectional converter; the other end of the resistor R5 is used as a voltage input end negative electrode Vin-of the bidirectional converter; the drain electrode of the power tube Q3 is connected with one end of the capacitor C5 and is used as the negative electrode Vo-of the voltage output end of the bidirectional converter; the source electrode of the power tube Q3 is connected with the source electrode of the power tube Q4 and is simultaneously connected with the heteronymous end of the secondary winding N2; the homonymous end of the secondary winding N2 is connected with one end of a capacitor C4 and is simultaneously connected with the other end of the capacitor C5, and the secondary winding N2 is used as the positive electrode vo+ of the voltage output end of the bidirectional converter; the other end of the capacitor C4 is connected with the drain electrode of the power tube Q4. The grid electrode of the power tube Q1 is connected with a control end Vg1 of the control and drive circuit; the grid electrode of the power tube Q2 is connected with a control end Vg2 of the control circuit and the drive circuit; the grid electrode of the power tube Q3 is connected with a control end Vg3 of the control circuit and the drive circuit; the grid electrode of the power tube Q4 is connected with a control end Vg4 of the control circuit and the drive circuit; the collector and emitter of the triode of the optocoupler U1 in the voltage detection circuit are respectively connected to the input end of the control and driving circuit, the positive electrode of the voltage input end of the voltage detection circuit is connected with the positive electrode vo+ of the voltage output end of the bidirectional converter, and the negative electrode of the voltage input end of the voltage detection circuit is connected with the negative electrode Vo-of the voltage output end of the bidirectional converter.
The control and drive circuit is composed of a singlechip and a drive chip (such as SI 8235), and the control and drive functions of the whole system are completed.
The operation principle of the voltage detection circuit of the present embodiment applied to the bidirectional converter to realize voltage sampling is described as follows with reference to fig. 2 and 3:
(1) When the bidirectional converter works, the current information of a main power circuit of the bidirectional converter is obtained by detecting the voltage of the end of the resistor R5, and the bidirectional converter is controlled by the control and drive circuit; the transformer auxiliary winding N3 is rectified and filtered through a diode D2 and a capacitor C2 to obtain a stable auxiliary power supply, and the stable auxiliary power supply is used for providing a power supply for the voltage sampling circuit; the voltage output end anode vo+ of the bidirectional converter clamps the voltage of the sampling end of the voltage sampling circuit to vo+VF through a diode D1 (namely, the anode voltage of the diode D1 can reflect the output voltage), the current of the primary side of the photocoupler U1 is controlled through an integrator formed by a three-terminal voltage stabilizer U2 and a capacitor C1 by the partial pressure of a resistor R2 and a resistor R3, and then a sampling output voltage signal is fed back to the primary side; when the output sampling voltage exceeds the set overvoltage protection threshold, the current flowing through the diode inside the optocoupler is larger, so that the voltage of the collector electrode of the triode of the optocoupler U1 is lowered. The control and drive circuit executes an overvoltage protection mechanism on the bidirectional converter by collecting the voltage of the triode collector of the optocoupler, so that the function of overvoltage protection on the output side is realized, namely, overvoltage protection is started; meanwhile, the auxiliary power supply simultaneously provides working voltage for the light emitting diode in the optical coupler and the three-terminal voltage stabilizer U2, so that the output voltage of the bidirectional converter is only clamped by the voltage sampling circuit, and energy is not consumed basically.
(2) When the system needs the bidirectional converter to be out of operation, the transformer T1 does not transmit energy, namely the auxiliary winding N3 does not transmit energy, so that the voltage sampling circuit is out of operation; in this stage, the voltage output end of the bidirectional converter releases energy in the form of leakage current through the diode D2, and the leakage current (uA stage) of the diode is extremely small, so that the voltage sampling circuit has extremely small influence on the energy loss of the output voltage.
In summary, the voltage detection circuit of the invention can ensure that the bidirectional converter has an overvoltage detection function during normal operation and can ensure that the leakage current of the output side of the bidirectional converter is extremely small during non-operation, thereby meeting the actual application requirements, especially for some demanding standby power occasions.
The above is only a preferred embodiment of the present invention, and alterations and modifications may be made to the above-described specific embodiment by those skilled in the art to which the present invention pertains. Therefore, the voltage detection circuit of the present invention is not limited to the bidirectional converter disclosed and described above, but can be applied to other types of converters for realizing overvoltage protection and voltage sampling functions, and it should be understood by those skilled in the art that modifications and variations of the present invention are also within the scope of the claims of the present invention without departing from the spirit and scope of the present invention. In addition, although specific terms are used in the present specification, these terms are for convenience of description only and do not limit the present invention in any way.
Claims (3)
1. A voltage detection circuit is used for realizing output voltage sampling of a converter and comprises a voltage sampling circuit and an optocoupler feedback circuit;
the voltage sampling circuit comprises a second resistor and a third resistor, one end of the second resistor is used as a voltage sampling end of the voltage sampling circuit, the other end of the second resistor is connected with one end of the third resistor in series, and the other end of the third resistor is used as a negative electrode of a voltage input end of the voltage detection circuit;
the optocoupler feedback circuit is used for processing the sampled voltage signals and then feeding back and outputting the processed voltage signals, and consists of an optocoupler, a fourth resistor, a three-terminal voltage stabilizer and a first capacitor, wherein one end of the fourth resistor is connected with the anode of the optocoupler light-emitting diode, and the cathode of the optocoupler light-emitting diode is connected with the cathode of the three-terminal voltage stabilizer and one end of the first capacitor; the anode of the three-terminal voltage regulator is connected with the cathode of the voltage input end of the voltage detection circuit, and the reference end of the three-terminal voltage regulator and the other end of the first capacitor are connected with the series connection point of the second resistor and the third resistor; the collector and the emitter of the triode of the optocoupler are respectively used as two feedback output ends of the voltage detection circuit;
the method is characterized in that: the auxiliary power supply is composed of an auxiliary winding of a transformer in the converter, a second diode and a second capacitor and is used for providing a power supply for the voltage sampling circuit; the same-name end of the auxiliary winding of the transformer is connected with the anode of a second diode, the cathode of the second diode is connected with one end of a second capacitor, and the connection point is used as the positive electrode of an auxiliary power supply and is simultaneously connected with the other end of a fourth resistor and one end of a first resistor; the other end of the second capacitor is connected with an auxiliary winding synonym end of the transformer, and the connection point is used as the negative electrode of an auxiliary power supply and is connected with the negative electrode of the voltage input end of the voltage detection circuit; the other end of the first resistor is connected with the anode of the first diode and one end of the second resistor, and the connection point is the voltage sampling end of the voltage sampling circuit; the cathode of the first diode is used as the positive electrode of the voltage input end of the voltage detection circuit.
2. A bi-directional converter employing the voltage detection circuit of claim 1, comprising a main power circuit and a control and drive circuit; the main power circuit comprises a transformer, wherein the transformer comprises three windings, namely a primary winding, a secondary winding and an auxiliary winding, a control end of the main power circuit is connected with a control end of a control and drive circuit, and a current sampling end of the drive and control circuit is connected with the main power circuit and used for detecting current information of the main power circuit;
the method is characterized in that: the bidirectional converter further comprises the voltage detection circuit of claim 1, wherein two feedback output ends of the voltage detection circuit are respectively connected with two input ends of the control and drive circuit; the positive electrode of the voltage input end of the voltage detection circuit is connected with the positive electrode of the voltage output end of the bidirectional converter, and the negative electrode of the voltage input end of the voltage detection circuit is connected with the negative electrode of the voltage output end of the bidirectional converter;
when the bidirectional converter works, the auxiliary power supply provides power supply voltage for the voltage sampling circuit, the voltage sampling circuit samples the voltage of the voltage output end of the bidirectional converter, the sampled voltage signal is processed and fed back to the control and driving circuit through the optocoupler feedback circuit, and when the sampled output voltage exceeds the set voltage, overvoltage protection is started; when the bidirectional converter is not operated, the voltage detection circuit is not operated, and the voltage output end of the bidirectional converter releases energy by the leakage current of the first diode in the voltage detection circuit.
3. The bi-directional converter of claim 2 wherein: the control and driving circuit is composed of a control chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811099244.4A CN109039092B (en) | 2018-09-20 | 2018-09-20 | Voltage detection circuit and bidirectional converter using same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811099244.4A CN109039092B (en) | 2018-09-20 | 2018-09-20 | Voltage detection circuit and bidirectional converter using same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109039092A CN109039092A (en) | 2018-12-18 |
| CN109039092B true CN109039092B (en) | 2024-01-16 |
Family
ID=64617132
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811099244.4A Active CN109039092B (en) | 2018-09-20 | 2018-09-20 | Voltage detection circuit and bidirectional converter using same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109039092B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110069026B (en) * | 2019-03-26 | 2022-03-25 | 柳州埃锡科技有限公司 | Self-adaptive IO monitor |
| CN110261661B (en) * | 2019-04-18 | 2022-06-14 | 矽力杰半导体技术(杭州)有限公司 | Current detection circuit and power converter |
| CN111146960B (en) * | 2020-01-19 | 2021-06-08 | 矽力杰半导体技术(杭州)有限公司 | Detection circuit and switching converter using same |
| CN114442519B (en) * | 2021-12-20 | 2023-09-22 | 南京铁道职业技术学院 | Rail vehicle slides trouble analog system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105207488A (en) * | 2015-10-26 | 2015-12-30 | 广州金升阳科技有限公司 | Loop control circuit of fly-back switching power supply and fly-back switching power supply adopting loop control circuit |
| CN107251397A (en) * | 2015-02-23 | 2017-10-13 | 三美电机株式会社 | Power supply semiconductor device |
| CN208890651U (en) * | 2018-09-20 | 2019-05-21 | 广州金升阳科技有限公司 | A kind of voltage detecting circuit and the reversible transducer using the circuit |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003033025A (en) * | 2001-07-19 | 2003-01-31 | Densei Lambda Kk | Switching power supply unit |
| US7616459B2 (en) * | 2005-12-07 | 2009-11-10 | Active-Semi, Inc. | System and method for a primary feedback switched mode power supply |
| US7755915B2 (en) * | 2006-12-01 | 2010-07-13 | Innocom Technology (Shenzhen) Co., Ltd. | Power supply circuit with at least one feedback circuit feeding operating state of transformer back to pulse width modulation circuit thereof |
| US8059429B2 (en) * | 2009-12-31 | 2011-11-15 | Active-Semi, Inc. | Using output drop detection pulses to achieve fast transient response from a low-power mode |
| CN102944723B (en) * | 2012-12-04 | 2015-02-18 | 成都芯源***有限公司 | Voltage detection circuit and voltage detection method |
| US9368961B2 (en) * | 2013-01-08 | 2016-06-14 | Power Integrations, Inc. | Overvoltage protection circuit |
| CN106300983B (en) * | 2015-05-26 | 2018-07-24 | 福州瑞芯微电子股份有限公司 | A kind of inverse-excitation type switch power-supply input voltage measurement device and method |
| JP6569414B2 (en) * | 2015-09-15 | 2019-09-04 | 富士電機株式会社 | Switching power supply |
| US10148188B2 (en) * | 2016-09-06 | 2018-12-04 | Fairchild Semiconductor Corporation | Clamp voltage detection and over-voltage protection for power supply topologies |
| CN108254614B (en) * | 2016-12-29 | 2020-04-24 | 比亚迪股份有限公司 | Switching power supply and voltage sampling circuit thereof |
-
2018
- 2018-09-20 CN CN201811099244.4A patent/CN109039092B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107251397A (en) * | 2015-02-23 | 2017-10-13 | 三美电机株式会社 | Power supply semiconductor device |
| CN105207488A (en) * | 2015-10-26 | 2015-12-30 | 广州金升阳科技有限公司 | Loop control circuit of fly-back switching power supply and fly-back switching power supply adopting loop control circuit |
| CN208890651U (en) * | 2018-09-20 | 2019-05-21 | 广州金升阳科技有限公司 | A kind of voltage detecting circuit and the reversible transducer using the circuit |
Non-Patent Citations (2)
| Title |
|---|
| 刘汉忠 ; 葛红宇 ; 张建华 ; .基于LD7670芯片的DC/DC电源模块设计.低压电器.2011,(第10期),全文. * |
| 张庆华 ; 卢广锋 ; 龙兴武 ; .一种高频高压单片开关电源的设计.电子技术应用.2007,(第07期),全文. * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109039092A (en) | 2018-12-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109039092B (en) | Voltage detection circuit and bidirectional converter using same | |
| WO2021008271A1 (en) | Battery management system awakening method and awakening system | |
| WO2022041890A1 (en) | Switching value acquisition circuit and method | |
| CN103490628B (en) | A kind of single-phase high-gain boost converter | |
| CN104201744A (en) | Equalizing charge circuit and battery pack | |
| CN102904454A (en) | Efficient insulation DC (direct-current) converter system in photovoltaic power generation system | |
| CN103840670A (en) | Energy-saving type high-frequency switching power source | |
| CN208890651U (en) | A kind of voltage detecting circuit and the reversible transducer using the circuit | |
| CN201160228Y (en) | Commercial power supplementary charging controller of extra-low-power consumption solar energy photovoltaic system | |
| CN102122891A (en) | Absorption feedback circuit for transformer leakage inductance energy | |
| CN211579660U (en) | Active equalization control system for energy storage battery | |
| CN109324222A (en) | Quick detection of power loss system and method based on reverse exciting topological | |
| CN103066888A (en) | Photovoltaic module with self compensating function | |
| CN209767213U (en) | Super capacitor energy storage system and power management system based on super capacitor energy storage system | |
| CN109066952B (en) | Low-self-consumption control circuit, solar controller and solar power generation system | |
| CN113346567B (en) | Lithium ion storage battery monomer active equalization circuit for carrying | |
| CN211351695U (en) | Output overcurrent protection circuit of high accuracy secondary control | |
| CN111277024A (en) | Active equalization control system and method for energy storage battery | |
| CN109450222B (en) | Switching power supply control IC energy supply circuit | |
| CN103795400B (en) | High-precision sampling circuit based on VICOR module | |
| CN201726329U (en) | Constant-voltage and constant-current power circuit | |
| CN106911167B (en) | Unidirectional active equalization circuit for energy storage | |
| CN103036440B (en) | Normal shock reset circuit for low voltage input | |
| CN202231478U (en) | Photovoltaic power source management device | |
| CN219611402U (en) | Constant-current constant-voltage battery charging circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | 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 |