CN213990125U - Bidirectional overcurrent protection device of bidirectional DC/DC converter - Google Patents
Bidirectional overcurrent protection device of bidirectional DC/DC converter Download PDFInfo
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- CN213990125U CN213990125U CN202023196751.5U CN202023196751U CN213990125U CN 213990125 U CN213990125 U CN 213990125U CN 202023196751 U CN202023196751 U CN 202023196751U CN 213990125 U CN213990125 U CN 213990125U
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Abstract
The utility model discloses a two-way overcurrent protection device of two-way DC converter, including current sampling unit, voltage comparison unit, PWM ripples generating element, logic processing unit and switching device drive unit, current sampling unit concatenates respectively on preceding stage inverter circuit, rear rectifier circuit's generating line, and two current sampling units are equallyd divide and are do not connected with voltage comparison unit electricity, and voltage comparison unit is connected with logic processing unit, switching device drive unit electricity in proper order, and PWM ripples generating element is connected with logic processing unit electricity. Respectively collecting bidirectional bus current and outputting corresponding voltage signals; and comparing the voltage signal with a set voltage value to judge whether the voltage signal is over-current or not and outputting a corresponding level signal, and driving the power switching device after the output level signal and the PWM waveform are subjected to logic processing and isolated and amplified. The overcurrent protection circuit can timely perform hardware protection on the generated overcurrent fault, and avoid the damage of a switching device caused by overcurrent.
Description
Technical Field
The utility model relates to an overcurrent protection technical field, concretely relates to two-way overcurrent protection device of two-way DC converter.
Background
A bidirectional DC/DC converter is a power electronic converter that can allow electric energy to flow between two levels of direct voltage. In the charging mode, the direct current bus voltage can be accurately converted into the voltage value required by the battery pack, and in the discharging mode, the battery pack voltage can be converted into the direct current bus voltage. The method is widely applied to the fields of renewable energy power generation systems, UPS systems, direct current electric automobiles, aging equipment of electronic products and the like, wherein energy needs to flow in two directions.
A bidirectional DC/DC converter is usually composed of a full bridge circuit composed of fully controlled switching devices. When the conditions of load short circuit, failure of a power device, bridge arm misconduction and the like occur, output overcurrent faults can be caused, the faults occur in short time and are high in destructiveness, potential safety hazards can be generated in the serious condition, and overcurrent protection is needed. The existing overcurrent protection technology generally adopts switching devices such as fuses, relays and the like to realize hardware protection, and the scheme is simple but the cost is higher.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical defects, the technical proposal adopted by the utility model is to provide a bidirectional overcurrent protection device of a bidirectional DC/DC converter, which is arranged between a direct current side and a load side, comprises a preceding stage inverter circuit, an isolation transformer and a subsequent stage rectifier circuit which are connected in sequence, and also comprises a current sampling unit, a voltage comparison unit, a PWM wave generation unit, a logic processing unit and a switching device driving unit, the current sampling units are respectively connected in series on the buses of the preceding stage inverter circuit and the succeeding stage rectifier circuit, the two current sampling units are respectively electrically connected with the voltage comparison unit, the voltage comparison unit is electrically connected with the logic processing unit and the switching device driving unit in sequence, the PWM wave generation unit is electrically connected with the logic processing unit, the switching device driving unit is electrically connected with power switching devices in the front stage inverter circuit and the rear stage rectifier circuit.
The current sampling unit is used for respectively collecting bus currents of the preceding stage inverter circuit and the subsequent stage rectifier circuit and outputting voltage signals corresponding to the collected currents to the voltage comparison unit; the voltage comparison unit is used for comparing the received voltage signal with a set voltage value to judge whether the voltage is over-current or not and outputting a corresponding level signal to the logic processing unit; the PWM wave generating unit is used for outputting PWM waveforms to the logic processing unit; the logic processing unit is used for processing the received level signal and the PWM waveform and outputting a processing signal to the switching device driving unit; and the switching device driving unit is used for driving the power switching devices of the front stage inverter circuit and the rear stage rectifier circuit after the received processing signals are isolated and amplified.
Further, the preceding stage inverter circuit comprises a direct current side support capacitor, a first bridge power conversion unit and an inductor, and the subsequent stage rectifier circuit comprises a load side support capacitor and a second bridge power conversion unit; the direct-current side supporting capacitor, the first bridge type power conversion unit, the inductor, the isolation transformer, the second bridge type power conversion unit and the load side supporting capacitor are sequentially connected.
Further, the first bridge power conversion unit includes a first power switch device, a second power switch device, a third power switch device, and a fourth power switch device, and the second bridge power conversion unit includes a fifth power switch device, a sixth power switch device, a seventh power switch device, and an eighth power switch device.
Further, the current sampling unit is a hall current sensor.
Further, the logic processing unit is an and gate logic processing chip.
Compared with the prior art the utility model discloses technical scheme's beneficial effect does:
the utility model provides a pair of two-way overcurrent protection method of two-way DC/DC converter utilizes behind current detection and the processing circuit, can in time carry out hardware protection to the overcurrent fault who takes place, avoid overflowing because of load or bridge arm short circuit overflows and cause the switching device to damage to play the effect of protection two-way DC/DC converter switching device, carry out two-way overcurrent protection to two-way DC/DC converter simultaneously, the hardware processing is fast, have the reliability high, moreover, the steam generator is simple in structure, cost characteristics such as lower relatively.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural block diagram of a bidirectional overcurrent protection apparatus of a bidirectional DC/DC converter according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a bidirectional DC/DC converter according to an embodiment of the present invention;
fig. 3 is a schematic circuit diagram of a current sampling unit according to an embodiment of the present invention;
fig. 4 is a schematic circuit diagram of a voltage comparison unit according to an embodiment of the present invention;
fig. 5A is a schematic circuit diagram of a logic processing unit and a switching device driving unit corresponding to the first bridge power conversion unit according to an embodiment of the present invention;
fig. 5B is a schematic circuit diagram of a logic processing unit and a switching device driving unit corresponding to the second bridge power conversion unit according to an embodiment of the present invention.
The reference numbers are as follows:
1. the device comprises a current sampling unit, a voltage comparison unit, a PWM wave generation unit, a logic processing unit, a switching device driving unit, a pre-stage inverter circuit, a post-stage rectifier circuit, a pre-stage inverter circuit, a post-stage inverter circuit, a first bridge power conversion unit, a second bridge power conversion unit and a second bridge power conversion unit, wherein the current sampling unit 2, the voltage comparison unit 3, the PWM wave generation unit, the logic processing unit 4, the switching device driving unit, the pre-stage inverter circuit, the isolation transformer, the post-stage rectifier circuit, the post-stage inverter circuit, the first bridge power conversion unit, the second bridge power conversion unit and the second bridge power conversion unit are arranged in parallel.
Detailed Description
The invention will be further explained with reference to the drawings and the specific embodiments.
Example 1
Referring to fig. 1-5, the present invention provides a bidirectional overcurrent protection device for a bidirectional DC/DC converter, the direct current voltage-limiting circuit is arranged between a direct current side and a load side and comprises a preceding stage inverter circuit 10, an isolation transformer 20 and a subsequent stage rectifier circuit 30 which are sequentially connected, a current sampling unit 1, a voltage comparison unit 2, a PWM wave generation unit 3, a logic processing unit 4 and a switching device driving unit 5, wherein the current sampling unit 1 is respectively connected in series with buses of the preceding stage inverter circuit 10 and the subsequent stage rectifier circuit 30, the two current sampling units 1 are respectively and electrically connected with the voltage comparison unit 2, the voltage comparison unit 2 is sequentially and electrically connected with the logic processing unit 4 and the switching device driving unit 5, the PWM wave generation unit 3 is electrically connected with the logic processing unit 4, and the switching device driving unit 5 is electrically connected with power switching devices in the preceding stage inverter circuit 10 and the subsequent stage rectifier circuit 30.
The current sampling unit 1 is used for respectively collecting bus currents of the preceding stage inverter circuit 10 and the subsequent stage rectifier circuit 30 and outputting voltage signals corresponding to the collected currents to the voltage comparison unit 2; the voltage comparison unit 2 is used for comparing the received voltage signal with a set voltage value to judge whether the voltage is over-current or not and outputting a corresponding level signal to the logic processing unit 4; a PWM wave generating unit 3 for outputting a PWM waveform to the logic processing unit 4; a logic processing unit 4 for processing the received level signal and PWM waveform and outputting the processed signal to the switching device driving unit 5; and the switching device driving unit 5 is used for driving the power switching devices of the front stage inverter circuit 10 and the rear stage rectifier circuit 30 after the received processing signal is subjected to isolation and amplification.
Specifically, the current sampling unit 1 is a hall current sensor. The logic processing unit 4 is an and gate logic processing chip. The voltage comparison unit 2 can send the overcurrent signal to the logic processing unit 4 in time, and the logic processing unit 4 blocks the PWM signal in time when receiving the overcurrent signal, so that overcurrent protection is completed.
Preferably, the front stage inverter circuit 10 includes a dc-side support capacitor, a first bridge power conversion unit 40, and an inductor, and the rear stage rectifier circuit 20 includes a load-side support capacitor and a second bridge power conversion unit 50; the dc-side support capacitor, the first bridge power conversion unit 40, the inductor, the isolation transformer 20, the second bridge power conversion unit 50, and the load-side support capacitor are connected in sequence.
Specifically, the first bridge power conversion unit 40 includes a first power switch Q1, a second power switch Q2, a third power switch Q3 and a fourth power switch Q4, and the second bridge power conversion unit 50 includes a fifth power switch Q5, a sixth power switch Q6, a seventh power switch Q7 and an eighth power switch Q8.
FIG. 2 shows a topology of a typical bidirectional DC/DC converter, where Vdc is the DC side voltage; vba is the battery side voltage; c1 and C2 are respectively support capacitors; Q1-Q8 are power switches; t is a high-frequency isolation transformer; l is transformer leakage inductance; MIa, MIb are current sampling units 1.
As shown in fig. 3, a signal processing circuit is integrated in the current sampling unit 1, the current sampling unit 1 collects current signals through the hall current sensor, and when a measured current passes through a primary pin of the hall current sensor, a corresponding voltage signal is output at an output end. Wherein U1 and U2 are Hall current sensors; the capacitors C1, C2, C5 and C6 are decoupling capacitors.
As shown in fig. 4, the current sampling unit 1 outputs corresponding voltage signals through diodes D1-D4. The resistor R1, the resistor R3, the resistor R2 and the resistor R4 respectively form a voltage division circuit, the comparison voltage value is set by changing the resistance value of the voltage division resistor, so that the voltage equivalent to the voltage corresponding to the current measurement value is obtained, and the accuracy and precision of comparison are guaranteed. The resistor R5, the capacitor C3, the resistor R6 and the capacitor C4 are respectively pulled down to be grounded, so that false triggering is prevented; comparators U3A, U3B; the capacitor C7 and the capacitor C8 are decoupling capacitors; the resistor R7, the resistor R8, the resistor R9 and the triode Q1 form a switch circuit, in a normal state, the triode Q1 is cut off, the output end is at a high level, when the comparator overturns to output the high level, the triode Q1 is conducted, and the output end is at a low level.
As shown in fig. 5A and 5B, and gate logic chips U4A, U4B, U4C, U4D, U9A, U9B, U9C, U9D; the optical coupling isolation driving chips are U5-U8 and U10-U13; the resistors R10-R17 are current-limiting resistors; the capacitors C9-C18 are decoupling capacitors; and the voltage comparison output signal and the PWM signal are processed by AND gate logic, and are transmitted to the optical coupler for isolation and amplification to drive the power switch device.
The utility model provides a two-way overcurrent protection device of two-way DC converter, the theory of operation as follows: collecting bus currents of a front-stage inverter circuit and a rear-stage rectifier circuit respectively through Hall current sensors and outputting voltage signals corresponding to the collected currents to a voltage comparison unit 2; the voltage comparison unit 2 compares the output voltage signal with a set voltage value to judge whether the voltage is over-current or not, and outputs a corresponding level signal to the AND logic chip; the output level signal and the PWM waveform are subjected to AND gate logic processing and then isolated and amplified to drive a power switch device of a preceding stage inverter circuit and a subsequent stage rectifier circuit; when overcurrent is judged, the voltage comparison unit 2 outputs level inversion and outputs an overcurrent protection signal to the gate logic chip, and the gate logic chip blocks the PWM signal.
It is above only the utility model discloses a preferred embodiment, the utility model discloses a scope of protection does not only confine above-mentioned embodiment, the all belongs to the utility model discloses a technical scheme under the thinking all belongs to the utility model discloses a scope of protection. It should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (5)
1. The utility model provides a two-way overcurrent protection device of two-way DC/DC converter, its setting is between direct current side and load side, including preceding stage inverter circuit (10), isolation transformer (20) and back stage rectifier circuit (30) that connect gradually, its characterized in that: the power supply circuit is characterized by further comprising a current sampling unit (1), a voltage comparison unit (2), a PWM (pulse-width modulation) wave generation unit (3), a logic processing unit (4) and a switching device driving unit (5), wherein the current sampling unit (1) is respectively connected in series with buses of a preceding stage inverter circuit (10) and a subsequent stage rectifier circuit (30), the two current sampling units (1) are respectively and electrically connected with the voltage comparison unit (2), the voltage comparison unit (2) is sequentially and electrically connected with the logic processing unit (4) and the switching device driving unit (5), the PWM wave generation unit (3) is electrically connected with the logic processing unit (4), and the switching device driving unit (5) is electrically connected with power switching devices in the preceding stage inverter circuit (10) and the subsequent stage rectifier circuit (30);
the current sampling unit (1) is used for respectively collecting bus currents of the preceding stage inverter circuit (10) and the subsequent stage rectifier circuit (30) and outputting voltage signals corresponding to the collected currents to the voltage comparison unit (2); the voltage comparison unit (2) is used for comparing the received voltage signal with a set voltage value to judge whether the voltage is over-current or not and outputting a corresponding level signal to the logic processing unit (4); the PWM wave generating unit (3) is used for outputting a PWM waveform to the logic processing unit (4); the logic processing unit (4) is used for processing the received level signal and the PWM waveform and outputting a processing signal to the switching device driving unit (5); and the switching device driving unit (5) is used for driving power switching devices of a front stage inverter circuit (10) and a rear stage rectifier circuit (30) after the received processing signals are isolated and amplified.
2. The bidirectional overcurrent protection device of the bidirectional DC/DC converter according to claim 1, wherein: the front-stage inverter circuit (10) comprises a direct-current side supporting capacitor, a first bridge type power conversion unit (40) and an inductor, and the rear-stage rectifier circuit (30) comprises a load side supporting capacitor and a second bridge type power conversion unit (50); the direct-current side support capacitor, the first bridge type power conversion unit (40), the inductor, the isolation transformer (20), the second bridge type power conversion unit (50) and the load side support capacitor are sequentially connected.
3. The bidirectional overcurrent protection device of the bidirectional DC/DC converter according to claim 2, wherein: the first bridge type power conversion unit (40) comprises a first power switch device, a second power switch device, a third power switch device and a fourth power switch device, and the second bridge type power conversion unit (50) comprises a fifth power switch device, a sixth power switch device, a seventh power switch device and an eighth power switch device.
4. The bidirectional overcurrent protection device of the bidirectional DC/DC converter according to claim 1, wherein: the current sampling unit (1) is a Hall current sensor.
5. The bidirectional overcurrent protection device of the bidirectional DC/DC converter according to claim 1, wherein: the logic processing unit (4) is an AND gate logic processing chip.
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| CN202023196751.5U CN213990125U (en) | 2020-12-25 | 2020-12-25 | Bidirectional overcurrent protection device of bidirectional DC/DC converter |
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| CN202023196751.5U CN213990125U (en) | 2020-12-25 | 2020-12-25 | Bidirectional overcurrent protection device of bidirectional DC/DC converter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112636306A (en) * | 2020-12-25 | 2021-04-09 | 国网智慧能源交通技术创新中心(苏州)有限公司 | Bidirectional overcurrent protection method and device of bidirectional DC/DC converter |
| WO2023202128A1 (en) * | 2022-04-19 | 2023-10-26 | Oppo广东移动通信有限公司 | Overcurrent protection circuit, control method, dc-dc converter, and electronic device |
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- 2020-12-25 CN CN202023196751.5U patent/CN213990125U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112636306A (en) * | 2020-12-25 | 2021-04-09 | 国网智慧能源交通技术创新中心(苏州)有限公司 | Bidirectional overcurrent protection method and device of bidirectional DC/DC converter |
| WO2023202128A1 (en) * | 2022-04-19 | 2023-10-26 | Oppo广东移动通信有限公司 | Overcurrent protection circuit, control method, dc-dc converter, and electronic device |
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Address after: 215000 201, building 6, 78 Keling Road, science and Technology City, Suzhou high tech Zone, Suzhou City, Jiangsu Province Patentee after: Guolian Smart Energy Transportation Technology Innovation Center (Suzhou) Co.,Ltd. Address before: 215000 201, building 6, 78 Keling Road, science and Technology City, Suzhou high tech Zone, Suzhou City, Jiangsu Province Patentee before: STATE GRID SMART ENERGY TRAFFIC TECHNOLOGY INNOVATION CENTER (SUZHOU) Co.,Ltd. |
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