Airborne direct-current dual-power-supply switching circuit

Abstract

The invention discloses an airborne direct-current dual-power-supply switching circuit. The airborne direct-current dual-power-supply switching circuit comprises an airborne direct-current main power supply, a main power supply power loop, a main power supply switching loop, an airborne direct-current slave power supply, a slave power supply power loop, a slave power supply switching loop and a load. The main power supply power loop is arranged between the airborne DC main power supply and the load, and the slave power supply power loop is arranged between the airborne DC slave power supply and the load. And the main power supply switching loop and the slave power supply switching loop are jointly used for controlling the on-off of the main power supply power loop and the slave power supply power loop. Wherein the main power supply power loop and the slave power supply power loop have different on-off states. The beneficial effects of the invention are that the method achieves the purpose of not interrupting power supply during the switching of the airborne DC dual power supplies in the prior art, and also can solve the problem of mutual feedback of the dual power supplies when the voltages of the dual power supplies are close.

Description

Technical Field

[0001] The invention relates to an airborne direct current dual power supply fast switching circuit. Background Art

[0002] With the development of aviation technology, safe and reliable flight has become a top priority. Many key devices inside the aircraft are equipped with multiple redundant systems. In these systems, power outages still often cause equipment to fail to work, which becomes a hidden danger to flight safety. Therefore, it is inevitable to develop technology that does not interrupt power supply during power switching.

[0003] Among them, the uninterruptible power supply technology adopted by the DC dual power supply switching is generally to connect the main power supply and the slave power supply to the anodes of two diodes respectively, and the cathodes of the two diodes are connected together, and then connected to the load. The above circuit has the characteristics of simple structure and can avoid the problem of mutual feedback between the dual power supplies. However, in addition to the loss of the diode conduction voltage drop, in fact, when the dual power supply voltages are close, the two power supplies will supply power to the load at the same time. Therefore, in some occasions, the above circuit is not suitable for use. Therefore, it is urgent to design a new type of airborne DC dual power supply switching uninterruptible power supply circuit to solve the above problems. Summary of the invention

[0004] The purpose of the present invention is to solve the problem of the prior art in which an uninterrupted power supply is achieved when an airborne DC dual power supply is switched, and to solve the problem of mutual feedback between the dual power supplies when the dual power supply voltages are close, thereby providing a novel airborne DC dual power supply switching circuit.

[0005] In order to achieve this purpose, the technical solution of the present invention is as follows: an airborne DC dual power supply switching circuit, comprising: an airborne DC main power supply, a main power supply power circuit, a main power supply switching circuit, an airborne DC slave power supply, a slave power supply power circuit, a slave power supply switching circuit, and a load, wherein the main power supply power circuit is between the airborne DC main power supply and the load, and the slave power supply power circuit is between the airborne DC slave power supply and the load, and the main power supply switching circuit and the slave power supply switching circuit are used together to control the on and off of the main power supply power circuit and the slave power circuit; wherein the main power supply power circuit and the slave power circuit have different on and off states.

[0006] As a preferred solution of the airborne DC dual power supply switching circuit, the main power supply power circuit includes: a P-type MOS tube Q1, a D terminal of the P-type MOS tube Q1 is connected to the airborne DC main power supply, an S terminal of the P-type MOS tube Q1 is connected to the load, and a G terminal of the P-type MOS tube Q1 receives a control signal from the main power supply switching circuit.

[0007] As a preferred solution of the airborne DC dual power supply switching circuit, the slave power supply circuit includes: P-type MOS tubes Q2 and Q3, the S terminal of the P-type MOS tube Q2 is connected to the airborne DC slave power supply. The D terminal of the P-type MOS tube Q2 is connected to the D terminal of the P-type MOS tube Q3, the S terminal of the P-type MOS tube Q3 is connected to the load, the G terminal of the P-type MOS tube Q2 receives the control signal from the slave power supply circuit, and the G terminal of the P-type MOS tube Q3 receives the control signal from the master power supply circuit.

[0008] As a preferred solution of the airborne DC dual power supply switching circuit, the main power supply switching circuit includes: NPN transistor Q5, resistors R1, R2, R3, R4, the slave power supply switching circuit includes: NPN transistors Q6 and Q7, resistors R5, R6, R7 and R8, the airborne DC main power supply is respectively connected to the first end of the resistor R2, the first end of the resistor R4, the first end of the resistor R5 and the G end of the P-type MOS tube Q3, the second end of the resistor R2 is respectively connected to the first end of the resistor R3 and the base of the NPN transistor Q5, and the collector of the NPN transistor Q5 is respectively connected to the first end of the resistor R3 and the base of the NPN transistor Q5. The first end of the resistor R1 and the G end of the P-type MOS transistor Q1 are connected separately, the second end of the resistor R1 is connected to the S end of the P-type MOS transistor Q1, the second end of the resistor R3, the second end of the resistor R4, and the emitter of the NPN-type transistor Q5 are all grounded, the onboard DC power supply is respectively connected to the first end of the resistor R7 and the first end of the resistor R8, the second end of the resistor R7 is respectively connected to the collector of the NPN-type transistor Q6 and the base of the NPN-type transistor Q7, the base of the NPN-type transistor Q6 is connected to the second end of the resistor R5 and the first end of the resistor R6. The second end of the resistor R6 is grounded, the collector of the NPN-type transistor Q6 and the emitter of the NPN-type transistor Q7 are both grounded, and the second end of the resistor R8 is respectively connected to the G end of the P-type MOS transistor Q2 and the collector of the NPN-type transistor Q7. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a structural schematic diagram of the airborne DC dual power supply switching circuit of the present invention.

[0010] Figure 2 It is a schematic diagram of the structure of the main power supply power circuit and the slave power supply power circuit of the present invention.

[0011] Figure 3 The present invention is a schematic diagram of the specific structure of an onboard DC dual power supply switching circuit. DETAILED DESCRIPTION

[0012] The present invention is further described in detail below by means of specific embodiments connected with the accompanying drawings. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0013] See also Figure 1 , shown in the figure is an airborne DC dual power supply switching circuit. The airborne DC dual power supply switching circuit includes: an airborne DC main power supply, a main power supply power circuit, a main power supply switching circuit, an airborne DC slave power supply, a slave power supply power circuit, a slave power supply switching circuit, a load, etc.

[0014] There is a main power circuit between the onboard DC main power supply and the load. There is a slave power circuit between the onboard DC slave power supply and the load. The main power switching circuit and the slave power switching circuit are used together to control the on and off of the main power circuit and the slave power circuit. Among them, the main power circuit and the slave power circuit have different on and off states. That is, if the main power circuit is connected, the slave power circuit is disconnected, and the load is powered by the onboard DC main power supply. Or, if the slave power circuit is connected, the main power circuit is disconnected, and the load is powered by the onboard DC slave power supply. Therefore, the onboard DC main power supply and the onboard DC slave power supply are switched to achieve the purpose of uninterrupted power supply.

[0015] Specifically, see Figure 2 The main power supply circuit includes: a P-type MOS tube Q1. The D terminal of the P-type MOS tube Q1 is connected to the onboard DC main power supply. The S terminal of the P-type MOS tube Q1 is connected to the load. The G terminal of the P-type MOS tube Q1 receives a control signal from the main power supply switching circuit. The slave power supply circuit includes: P-type MOS tubes Q2 and Q3. The S terminal of the P-type MOS tube Q2 is connected to the onboard DC slave power supply. The D terminal of the P-type MOS tube Q2 is connected to the D terminal of the P-type MOS tube Q3. The S terminal of the P-type MOS tube Q3 is connected to the load. The G terminal of the P-type MOS tube Q2 receives a control signal from the slave power supply circuit. The G terminal of the P-type MOS tube Q3 receives a control signal from the main power supply circuit. The P-type MOS tubes Q1, Q2, and Q3 can solve the heating problem of circuit power devices well due to their small on-resistance.

[0016] For further details, see Figure 3, the main power switching circuit includes: NPN transistor Q5, resistors R1, R2, R3, R4. The slave power switching circuit includes: NPN transistors Q6 and Q7, resistors R5, R6, R7 and R8. The onboard DC main power supply is respectively connected to the first end of the resistor R2, the first end of the resistor R4, the first end of the resistor R5 and the G end of the P-type MOS tube Q3. The second end of the resistor R2 is respectively connected to the first end of the resistor R3 and the base of the NPN transistor Q5. The collector of the NPN transistor Q5 is respectively connected to the first end of the resistor R1 and the G end of the P-type MOS tube Q1. The second end of the resistor R1 is connected to the S end of the P-type MOS tube Q1. The second end of the resistor R3, the second end of the resistor R4, and the emitter of the NPN transistor Q5 are all grounded. The onboard DC slave power supply is respectively connected to the first end of the resistor R7 and the first end of the resistor R8. The second end of the resistor R7 is connected to the collector of the NPN transistor Q6 and the base of the NPN transistor Q7 respectively. The base of the NPN transistor Q6 is connected to the second end of the resistor R5 and the first end of the resistor R6. The second end of the resistor R6 is grounded. The collector of the NPN transistor Q6 and the emitter of the NPN transistor Q7 are both grounded. The second end of the resistor R8 is connected to the G end of the P-type MOS tube Q2 and the collector of the NPN transistor Q7 respectively.

[0017] The main power switching circuit uses the NPN transistor Q5 to control the on-off of the main power circuit Q1, and uses the resistor R4 to control the on-off of the P-type MOS transistor Q3. The slave power switching circuit uses the NPN transistor Q7 to control the on-off of the P-type MOS transistor Q2. The on-off state of the NPN transistor Q6 is controlled by the voltage state of the onboard DC main power supply, and the NPN transistor Q7 is controlled by the NPN transistor Q6 to solve the switching of the onboard DC dual power switching circuit.

[0018] The above only expresses the implementation mode of the present invention, and its description is relatively specific and detailed, but it cannot be understood as limiting the scope of the invention patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be based on the attached claims.

Claims

1. An airborne DC dual power supply switching circuit, characterized in that: include: An airborne DC main power supply, a main power supply power circuit, a main power supply switching circuit, an airborne DC slave power supply, a slave power supply power circuit, a slave power supply switching circuit, and a load. The main power supply power circuit is between the airborne DC main power supply and the load, and the slave power supply power circuit is between the airborne DC slave power supply and the load. The main power supply switching circuit and the slave power supply switching circuit are used together to control the on / off of the main power supply power circuit and the slave power supply power circuit; wherein the main power supply power circuit and the slave power supply power circuit have different on / off states.

2. The airborne DC dual power supply switching circuit according to claim 1, characterized in that: The main power supply power circuit includes: a P-type MOS tube Q1, a D terminal of the P-type MOS tube Q1 is connected to the onboard DC main power supply, an S terminal of the P-type MOS tube Q1 is connected to the load, and a G terminal of the P-type MOS tube Q1 receives a control signal from the main power supply switching circuit.

3. The airborne DC dual power supply switching circuit according to claim 2, characterized in that: The slave power circuit includes: P-type MOS transistors Q2 and Q3, the S terminal of the P-type MOS transistor Q2 is connected to the onboard DC slave power supply, the D terminal of the P-type MOS transistor Q2 is connected to the D terminal of the P-type MOS transistor Q3, the S terminal of the P-type MOS transistor Q3 is connected to the load, the G terminal of the P-type MOS transistor Q2 receives a control signal from the slave power circuit, and the G terminal of the P-type MOS transistor Q3 receives a control signal from the master power circuit.

4. The airborne DC dual power supply switching circuit according to claim 3, characterized in that: The main power switching circuit includes: NPN transistor Q5, resistors R1, R2, R3, R4, the slave power switching circuit includes: NPN transistors Q6 and Q7, resistors R5, R6, R7 and R8, the onboard DC main power supply is respectively connected to the first end of the resistor R2, the first end of the resistor R4, the first end of the resistor R5 and the G end of the P-type MOS tube Q3, the second end of the resistor R2 is respectively connected to the first end of the resistor R3 and the base of the NPN transistor Q5, the collector of the NPN transistor Q5 is respectively connected to the first end of the resistor R1 and the G end of the P-type MOS tube Q1, the second end of the resistor R1 is connected to the S end of the P-type MOS tube Q1, the resistor The second end of R3, the second end of the resistor R4, and the emitter of the NPN transistor Q5 are all grounded, the onboard DC power supply is respectively connected to the first end of the resistor R7 and the first end of the resistor R8, the second end of the resistor R7 is respectively connected to the collector of the NPN transistor Q6 and the base of the NPN transistor Q7, the base of the NPN transistor Q6 is connected to the second end of the resistor R5 and the first end of the resistor R6, the second end of the resistor R6 is grounded, the collector of the NPN transistor Q6 and the emitter of the NPN transistor Q7 are both grounded, and the second end of the resistor R8 is respectively connected to the G end of the P-type MOS tube Q2 and the collector of the NPN transistor Q7.

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