CN111181241A - Bidirectional conversion circuit for dual-source power supply - Google Patents
Bidirectional conversion circuit for dual-source power supply Download PDFInfo
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- CN111181241A CN111181241A CN201911401060.3A CN201911401060A CN111181241A CN 111181241 A CN111181241 A CN 111181241A CN 201911401060 A CN201911401060 A CN 201911401060A CN 111181241 A CN111181241 A CN 111181241A
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- power supply
- switching unit
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- relay
- power
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/061—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for DC powered loads
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- Direct Current Feeding And Distribution (AREA)
Abstract
The invention discloses a conversion circuit for switching power supply between a first power supply and a second power supply, which comprises: a power supply changeover switch configured to output a changeover instruction; the switching circuit comprises a first switching unit and a second switching unit, wherein the first switching unit and the second switching unit are configured to switch power supply of a first power supply and a second power supply according to a switching instruction, so that the switching circuit has a first circuit configuration and a second circuit configuration; and the power supply indicating module is configured to indicate the current power supply for supplying power to the power supply bus. The switching circuit provided by the invention realizes the smooth switching of the dual-source bidirectional power supply of the power supply system, can effectively solve the problems of short-time power supply interruption and voltage and current fluctuation in the switching process of the dual-source power supply, improves the traditional smooth switching process realized by an uninterrupted power supply into the seamless smooth switching realized by an energy storage capacitor and a time delay relay, reduces the development cost of the direct switching of the dual-source power supply of the power supply system, simplifies the control mode and improves the reliability of the switching circuit.
Description
Technical Field
The invention belongs to the field of electrical engineering, and particularly relates to a smooth-power-supply bidirectional conversion circuit for double-source power supply.
Background
With the continuous development of the electrification degree of the modern industry, the scale of a power supply system is continuously enlarged, and the complexity of the system is increased day by day. Especially in the fields of aviation, aerospace, navigation and other industrial national defense technologies in recent years, the development of multiple electrification and full electrification is greatly improved, and the development direction becomes the mainstream development direction in the future.
Along with the electrification process in the technical industry field, the electrical load becomes more and more complex, and the requirements on the power supply quality and the power supply reliability of the system are higher and higher. A strong power supply system is established and becomes a very key ring for future electrification popularization, and the stability and the anti-interference performance of various loads can be ensured only by a reliable power supply system.
An important means for improving the reliability of a power supply system is to increase the redundancy of system power supply, i.e., ensure the multisource of the power supply system and prevent the instability of the whole system caused by the reduction of the reliability of a single power supply. Two or more power supply sources are introduced to be connected in parallel for power supply in the electrical system design in the industrial national defense technology fields of aviation, aerospace, navigation and the like, so that the power supply reliability of the system is ensured. In the parallel design of power supplies, the most important technical problem is to ensure the stability of power supply switching between power supplies. The more complex the electrical load in the system, the higher the adaptability and reliability of the power supply conversion device. The power supply conversion circuit is used as the core content of the design of the power supply device and is the guarantee of multi-source redundant power supply. Therefore, in the design process of the power supply circuit, the stability of smooth switching between system power supplies is satisfied functionally, and the reliability of frequent switching is ensured by simplifying the design of the circuit, which brings a plurality of technical problems in the development process.
Disclosure of Invention
In order to solve the technical problem, the invention provides a smooth-power-supply bidirectional conversion circuit for dual-source power supply, which is used for avoiding short-time power supply interruption and voltage and current fluctuation in the switching process from a main power supply to a switching power supply or from the switching power supply to the main power supply.
The invention provides a bidirectional conversion circuit for double power supplies, which comprises a first power supply, a second power supply, a power supply change-over switch, a first switching unit, a second switching unit and a power supply indicating module. The first switching unit and the second switching unit are both composed of a preceding stage control relay and a subsequent stage power supply relay. The preceding stage power supply control relay in the first switching unit is a relay with a delayed turn-on function. Before the power supply change-over switch is closed, the second power supply is disconnected with the power supply bus, the first power supply is connected with the power supply bus through the first switching unit to supply power to the power utilization load, after the power supply change-over switch is closed, the first power supply is disconnected with the power supply bus, and the second power supply is connected with the power supply bus through the second switching unit to supply power to the power utilization load.
When a first power supply supplies power to a power supply bus, a normally closed contact of a preceding stage control relay in a first switching unit is closed, the first power supply supplies power to a control end of a rear stage power supply relay in the first switching unit through an input end of the preceding stage control relay in the first switching unit and the normally closed contact of the preceding stage control relay, a normally open contact of the rear stage power supply relay in the first switching unit is closed, and the first power supply supplies power to the power supply bus through an input end of the rear stage power supply relay in the first switching unit and the normally open contact of the rear stage power supply relay.
At the same time, the normally closed contact of the preceding stage control relay in the second switching unit is closed, the first power supply charges a capacitor connected in parallel with the control end of the subsequent stage power supply relay in the second switching unit through the normally closed contact of the preceding stage control relay in the second switching unit and the input end, and t0After time, the capacitor voltage reaches the action voltage of the relay, the normally closed contact of the rear-stage power supply relay in the second switching unit is closed, and the second power supply is disconnected with the power supply bus.
The power supply bus supplies power to the light emitting diode in the first power supply indicating circuit through the input end of the preceding stage control relay in the second switching unit and the normally closed contact of the preceding stage control relay; and the light emitting diode in the first power supply indicating circuit is lightened, so that the first power supply supplies power to the power supply bus at the moment.
Further, when the first power supply is switched into the second power supply to supply power to the power supply bus, the second power supply is electrified, and the second power supply and the power supply bus are kept in a disconnected state at the moment. The power supply change-over switch is closed, the first power supply supplies power to the control end of the preceding stage control relay in the second switching unit through the power supply change-over switch, the normally open contact of the preceding stage control relay in the second switching unit is disconnected, the first power supply disconnects power to the control end of the rear stage power supply relay in the second switching unit, the capacitor connected with the control end of the rear stage power supply relay in the second switching unit in parallel starts to discharge, t1After time, the capacitor voltage is reduced to the release voltage of the relay, the normally closed contact of the rear power supply relay in the second switching unit is closed, and the second power supply supplies power to the power supply bus through the input end and the normally closed contact of the rear power supply relay in the second switching unit.
Meanwhile, the first power supply supplies power to the first switching unit through the power supply switching switchThe control end of the preceding stage control relay in the first switching unit supplies power, and the preceding stage control relay in the first switching unit delays the time t2And when the time acts, the normally closed contact is disconnected, the first power supply is disconnected to supply power to the control end of the rear-stage power supply relay in the first switching unit, the normally open contact of the rear-stage power supply relay in the first switching unit is disconnected, and the first power supply is disconnected to supply power to the power supply bus.
The power supply bus supplies power to the light emitting diode in the second power supply indicating circuit through the input end of the preceding stage control relay in the second switching unit and the normally open contact of the preceding stage control relay; and the light emitting diode in the second power supply indicating circuit is lightened, so that the second power supply supplies power to the power supply bus at the moment.
Furthermore, when the second power supply is switched into the first power supply to supply power to the power supply bus, the power supply change-over switch is switched off, the normally closed contact of the preceding stage control relay in the first switching unit is switched on to supply power to the control end of the power supply relay in the first switching unit, the normally open contact of the power supply relay in the first switching unit is switched on, and the first power supply is switched on to supply power to the power supply bus. Meanwhile, a normally closed contact of a preceding stage control relay in the second switching unit is switched on to charge a capacitor at a control end of a subsequent stage power supply relay in the second switching unit, and t0After the time, the normally open contact of the rear-stage power supply relay in the second switching unit is switched on, the normally closed contact is switched off, and the second power supply is switched off to supply power to the power supply bus. And the light emitting diode in the first power supply indicating circuit is lightened, so that the first power supply supplies power to the power supply bus at the moment.
Further, in the process of switching the first power supply to the second power supply, t1Less than t2And the second power supply is ensured to supply power to the power supply bus in front, and the first power supply is disconnected to supply power to the power supply bus in back.
The bidirectional power supply conversion circuit for the double power supplies can realize bidirectional switching from the first power supply to the second power supply and from the second power supply to the first power supply. The charge-discharge characteristic of the capacitor is utilized in the circuit design to ensure that the switched power supply is firstly connected with the power supply bus and then disconnected with the bus before switching in the switching process, thereby ensuring that the power supply bus supplies power uninterruptedly and stably in the switching process. Meanwhile, the energy storage characteristic of the capacitor is utilized to make up the defects that the time delay relay can only realize power-on time delay connection and can not realize power-off time delay disconnection, and the stability of the two-way switching process is ensured. The circuit simplifies the complexity of system control and can effectively reduce the economic cost of the traditional power supply conversion device.
The circuit provided by the invention fully utilizes the characteristic that the voltage changes along with time in the process of charging and discharging the capacitor, and is matched with the relay with the time delay function to realize the smooth conversion of the double-source bidirectional power supply of the power supply system. The invention can effectively solve the problems of short-time power supply interruption and voltage and current fluctuation in the double-source power supply switching process, improves the traditional smooth switching process realized by an uninterruptible power supply into seamless smooth switching realized by an energy storage capacitor and a time delay relay, reduces the development cost of direct switching of double power supplies of a power supply system, simplifies the control mode and improves the reliability of a switching circuit.
Drawings
FIG. 1 is a schematic diagram of a bi-directional power conversion circuit for dual power supplies according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a bus voltage curve during a transition from a first power source to a second power source in accordance with an embodiment of the present invention;
fig. 3 is a schematic diagram of a bus voltage curve during a transition from the second power source to the first power source according to an embodiment of the invention.
Detailed Description
The present invention is described in detail below with reference to a preferred embodiment thereof.
As shown in fig. 1, the dual-source bidirectional power supply smooth conversion circuit provided by the present invention includes a main power source (i.e., a first power source), a switching power source (i.e., a second power source), a power supply switch, a main battery power supply switching relay set (i.e., a first switching unit), a switching power supply switching relay set (i.e., a second switching unit), and a power supply switching indication module. The main power supply and the switching power supply are both 28V, and the main power supply switching relay group and the switching power supply switching relay group are respectively composed of a front-stage control relay and a rear-stage power supply relay. The secondary power supply relays K1 and K2 are JQX-2115M-028 electromagnetic relays, the action voltage (max) of the relays is 20V within the full temperature range, and the release voltage (min) of the relays is 1.5V. The main power supply pre-stage control relay K3 selects JSB-93M-027-11-0.35s-II delay relay, the delay on-time is 0.35s, and the switching power supply pre-stage control relay K4 selects JQC-2105M-028 electromagnetic relay. Before the power supply change-over switch S1 is closed, the switching power supply is disconnected with the power supply bus, the main power supply is connected with the power supply bus through the K2 relay to supply power to the electric load, after the power supply change-over switch is closed, the main power supply is disconnected with the power supply bus, and the switching power supply is connected with the power supply bus through the K1 relay to supply power to the electric load.
When the main power supply is used for supplying power, the normally closed contact of the front stage control relay K3 of the main power supply switching relay group is closed, the main power supply supplies power to the control end of the rear stage power supply relay K2 of the main power supply switching relay group through the input end (4) of the relay K3 and the normally closed contact (5) of the input end, the normally open contact of the relay K2 is closed, and the main power supply supplies power to the power supply bus through the input ends (1) and (3) of the relay K2 and the normally open contacts (2).
Meanwhile, a normally closed contact of a front stage control relay K4 of the switching power supply switching relay group is closed, a main power supply charges a capacitor C1 connected in parallel with a control end of a rear stage power supply relay K1 of the switching power supply switching relay group through a normally closed contact (2) of a relay K4 and an input end (1), the capacitance value of the capacitor C1 is 470 muF, the resistance value of a series resistor R0 is 330 omega, the voltage of two ends of the capacitor reaches 20V after 0.45s according to a capacitor charging and discharging formula, namely the action voltage of the relay K1, the normally closed contact of the relay K1 is closed, and the switching power supply is disconnected with a power supply bus.
The power supply bus supplies power to a light-emitting diode V4 in the main power supply indicating circuit through an input end (4) of a pre-stage control relay K4 of a switching power supply switching relay group and a normally closed contact (5) of the pre-stage control relay; light emitting diode V4 lights indicating that power is being supplied to the power bus from the main power supply at this time.
When the main power supply is switched to the switching power supply to supply power to the power supply bus, the switching power supply is electrified, and the switching power supply and the power supply bus are kept in a disconnected state at the moment. The power supply changeover switch S1 is closed, the main power supply supplies power to the control end of a front stage control relay K4 of the switching power supply switching relay group through the power supply changeover switch S1, a normally open contact of the relay K4 is disconnected, the main power supply is disconnected to supply power to the control end of a rear stage power supply relay K1 of the switching power supply switching relay group, a capacitor C1 connected with the control end of a relay K1 in parallel starts to discharge, after 0.2S, the capacitor voltage is reduced to 1.5V, namely the release voltage of the relay K1, a normally closed contact of the relay K1 is closed, and the input ends (1) and (4) of the switching power supply relay K1 and normally closed contacts (2) and (5) of the switching power supply relay K.
Meanwhile, the main power supply supplies power to the control end of the front stage control relay K3 of the main power supply switching relay group through the power supply switching switch S1, the relay K3 acts in a delayed mode for 0.35S, the normally closed contact is disconnected, the main power supply is disconnected to supply power to the control end of the rear stage power supply relay K2 of the main power supply switching relay group, the normally open contact of the relay K2 is disconnected, and the main power supply is disconnected to supply power to the power supply bus.
The power supply bus supplies power to a light-emitting diode V5 in the switching power supply indicating circuit through an input end (4) of a preceding stage control relay K4 of a switching power supply switching relay group and a normally open contact (6) of the preceding stage control relay; light emitting diode V5 lights indicating that power is being supplied to the supply bus by the switching power supply at this time.
Further, when the switching power supply is switched to the main power supply, the power supply switching switch S1 is switched off, the normally closed contact of the preceding stage control relay K3 of the main power supply switching relay group is switched on to supply power to the control end of the main power supply switching relay group K2, the normally open contact of the relay K2 is closed, and the main power supply is switched on to supply power to the power supply bus. Meanwhile, a normally closed contact of a front stage control relay K4 of the switching power supply switching relay group is switched on to charge a capacitor C1 at the control end of a rear stage power supply relay K1 of the switching power supply switching relay group, after 0.45s, the voltage at two ends of the capacitor reaches 20V, namely the action voltage of the relay K1, the normally closed contact of the relay K1 is closed, and the switching power supply is disconnected with a power supply bus. Light emitting diode V5 is off and V4 is on, indicating that power is being supplied to the power bus from the main power supply at this time.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and the design method of the present invention is also applicable to the design of the multi-source and multi-directional switching circuit, and the present invention may be implemented by additionally modifying the above modules, or replacing the above modules with technical equivalents, for example: adding further optimized modules, and the like. Therefore, structural equivalents made by using the description and drawings of the present invention or by directly or indirectly applying to other related arts are all included in the scope of the present invention.
Claims (9)
1. A bidirectional conversion circuit for switching power supply between a first power supply and a second power supply, wherein the first power supply is connected in parallel with the second power supply, and positive terminals of the first power supply and the second power supply are connected to a power supply bus through the bidirectional conversion circuit, the bidirectional conversion circuit comprising:
a power supply changeover switch configured to output a changeover instruction;
the first switching unit and the second switching unit are configured to switch power supply of the first power supply and the second power supply according to the switching instruction, so that the conversion circuit has a first circuit configuration and a second circuit configuration; and
and the power supply indicating module is configured to indicate the current power supply for supplying power to the power supply bus.
2. The conversion circuit according to claim 1, wherein the first switching unit and the second switching unit are each composed of a preceding stage control relay and a succeeding stage power supply relay.
3. The conversion circuit according to claim 2, wherein the preceding stage control relay in the first switching unit is a relay having a time-delay turn-on function.
4. The conversion circuit of any of claims 1-3,
in the first circuit configuration, the power supply changeover switch is turned off, and the power supply indicating module indicates the first power supply to supply power to the power supply bus;
in the second circuit configuration, the power supply changeover switch is closed, and the power supply indicating module indicates the second power supply to supply power to the power supply bus.
5. The conversion circuit according to claim 4, wherein, in the first circuit configuration, the first power supply supplies power to the control terminal of the subsequent power supply relay in the first switching unit through the input terminal of the preceding stage control relay in the first switching unit and its normally closed contact, the normally open contact of the subsequent power supply relay in the first switching unit is closed, and the first power supply supplies power to the power supply bus through the input terminal of the subsequent power supply relay in the first switching unit and its normally open contact;
normally closed contact closure of preceding stage control relay in the second switching unit, first power passes through normally closed contact and the input of preceding stage control relay in the second switching unit to with the parallelly connected electric capacity of back level power supply relay control end in the second switching unit charges, the normally closed contact closure of back level power supply relay in the second switching unit, the second power with power supply bus disconnection.
6. The switching circuit according to claim 4, wherein in the second circuit configuration, the first power supply supplies power to the control terminal of the preceding stage control relay in the second switching unit through the power supply changeover switch, the normally open contact of the preceding stage control relay in the second switching unit is opened, the first power supply cuts off power supply to the control terminal of the subsequent stage power supply relay in the second switching unit, the normally closed contact of the subsequent stage power supply relay in the second switching unit is closed, and the second power supply supplies power to the power supply bus through the input terminal of the subsequent stage power supply relay in the second switching unit and the normally closed contact thereof;
the first power supply supplies power to the control end of the preceding stage control relay in the first switching unit through the power supply changeover switch, the normally closed contact of the preceding stage control relay in the first switching unit is disconnected, the first power supply is disconnected to the power supply of the control end of the rear stage power supply relay in the first switching unit, and the normally open contact of the rear stage power supply relay in the first switching unit is disconnected, so that the first power supply is disconnected to the power supply bus.
7. The switching circuit according to claim 5 or 6, wherein the power supply indication module comprises a first power supply indication circuit and a second power supply indication circuit, and both the first power supply indication circuit and the second power supply indication circuit are composed of a light emitting diode and a current limiting resistor.
8. The switching circuit according to claim 7, wherein in the first circuit configuration, the power supply bus supplies power to a light emitting diode in the first power supply indication circuit through an input terminal of a preceding stage control relay in the second switching unit and a normally closed contact thereof; in the second circuit configuration, the power supply bus supplies power to the light emitting diode in the second power supply indication circuit through the input end of the preceding stage control relay in the second switching unit and the normally open contact thereof.
9. The switching circuit of claim 8, wherein the control terminals of the first power supply, the second power supply, and all relays and the supply bus are common negative.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911401060.3A CN111181241A (en) | 2019-12-31 | 2019-12-31 | Bidirectional conversion circuit for dual-source power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911401060.3A CN111181241A (en) | 2019-12-31 | 2019-12-31 | Bidirectional conversion circuit for dual-source power supply |
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| Publication Number | Publication Date |
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| CN111181241A true CN111181241A (en) | 2020-05-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201911401060.3A Pending CN111181241A (en) | 2019-12-31 | 2019-12-31 | Bidirectional conversion circuit for dual-source power supply |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111756284A (en) * | 2020-06-17 | 2020-10-09 | 江西洪都航空工业集团有限责任公司 | Dual-channel aircraft generator control device with dual-redundancy design |
-
2019
- 2019-12-31 CN CN201911401060.3A patent/CN111181241A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111756284A (en) * | 2020-06-17 | 2020-10-09 | 江西洪都航空工业集团有限责任公司 | Dual-channel aircraft generator control device with dual-redundancy design |
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Application publication date: 20200519 |
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| WD01 | Invention patent application deemed withdrawn after publication |