CN215706135U - Dual-power switching system and satellite vehicle-mounted equipment - Google Patents
Dual-power switching system and satellite vehicle-mounted equipment Download PDFInfo
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- CN215706135U CN215706135U CN202120815498.2U CN202120815498U CN215706135U CN 215706135 U CN215706135 U CN 215706135U CN 202120815498 U CN202120815498 U CN 202120815498U CN 215706135 U CN215706135 U CN 215706135U
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Abstract
The utility model relates to a dual power supply switching system and satellite vehicle-mounted equipment, wherein when a control unit receives a control instruction of an upper computer and needs signal transmission, the control unit sends an enabling opening instruction to open a first power supply assembly and close a second power supply assembly; when the signal is required to be received, the control unit sends an enabling opening instruction to open the second power supply assembly and close the first power supply assembly, so that the alternate work of the signal transmitting circuit and the signal receiving circuit is realized. The technical scheme provided by the utility model is simple to deploy and convenient to operate, reduces the manual investment due to no need of manual monitoring, avoids the problem of misoperation caused by manual operation, and has the advantages of higher reliability, good user experience and high satisfaction.
Description
Technical Field
The utility model relates to the technical field of power supply of satellite vehicle-mounted equipment, in particular to a dual-power switching system and satellite vehicle-mounted equipment.
Background
The Beidou vehicle-mounted equipment is mainly used for real-time navigation, quick positioning, accurate time service, position reporting and short message communication services, and a power supply main body of the Beidou vehicle-mounted equipment is generally a battery or a generator. In the prior art, the Beidou vehicle-mounted equipment realizes signal transmission and signal reception through manually controlling a power switch, and has the problems of complex operation, large power consumption and easiness in causing misoperation.
Taking the second Beidou vehicle-mounted equipment as an example, the second Beidou vehicle-mounted equipment needs to transmit and receive signals of ground vehicle-mounted equipment, and a transmitting switch needs to be manually turned on and a receiving switch is turned off when the signals are transmitted; when receiving signals, the transmitting switch needs to be manually closed, and the receiving switch is opened.
Thus, the operation is complicated and the error is easy to occur. For example, when the signal transmitting switch is turned off and the signal receiving switch is not turned on, the vehicle-mounted communication equipment cannot receive the signal, which may result in failure of real-time navigation and accurate positioning of the vehicle-mounted weaponry during driving.
SUMMERY OF THE UTILITY MODEL
In view of this, the present invention provides a dual power switching system and a satellite vehicle-mounted device, so as to solve the problems of complicated operation and easy error in power supply control of the vehicle-mounted device in the prior art.
According to a first aspect of embodiments of the present invention, there is provided a dual power supply switching system, including:
an upper computer is arranged on the main body,
the first power supply assembly is used for supplying power to the signal transmitting circuit;
the second power supply assembly is used for supplying power to the signal receiving circuit;
and the control unit is connected with the upper computer and controls the first power supply assembly and the second power supply assembly to be opened or closed through enabling so as to switch the working states of the signal transmitting circuit and the signal receiving circuit.
Preferably, the system further comprises:
the first output voltage sampling unit and/or the first output current sampling unit;
the control unit detects the output voltage and/or the output current of the first power supply assembly through the first output voltage sampling unit and/or the first output current sampling unit.
Preferably, the system further comprises:
the second output voltage sampling unit and/or the second output current sampling unit;
the control unit detects the output voltage and/or the output current of the second power supply assembly through the second output voltage sampling unit and/or the second output current sampling unit.
Preferably, the first power supply component comprises:
the voltage of the transformer T1 is,
a switch module, an enabling module and an overvoltage protection module are arranged on the primary winding side of the transformer T1;
a voltage stabilizing module and a filtering module are arranged on the secondary winding side of the transformer T1;
the switch module is externally connected with a power supply and is connected with the enabling module; the enabling module is connected with the control unit and used for enabling and controlling the on-off of the switch module; the overvoltage protection module is used for controlling the output voltage of the switch module to be within a threshold range of the input voltage of the transformer T1;
the voltage stabilizing module is used for reducing the output voltage of the transformer T1 into the working voltage of the signal transmitting circuit; and the filtering module is used for removing burrs and spikes in the output voltage of the transformer T1.
Preferably, the overvoltage protection module comprises:
the chip IC2 is a chip on which, among other things,
the pin No. 1 of the chip IC2 is connected with the pin No. 2 through a resistor R46 and a capacitor C60 which are connected in parallel; the No. 3 pin is grounded through a capacitor C63, a resistor R55, a resistor R56 and a resistor R57 which are connected in parallel; pin No. 4 is grounded through a capacitor C64 and is connected with the base electrode of a triode Q7; the base electrode of the triode Q7 is connected with the No. 3 pin of the chip IC2 through a capacitor C65 and is connected with the No. 8 pin of the chip IC2 through a pull-up resistor R51; an emitter of the triode Q7 is connected with a pin No. 3 of the chip IC2 through a resistor R58; pin 6 of the chip IC2 is connected with the grid of the MOS tube Q5 through a resistor R52, the grid of the MOS tube Q5 is grounded through a resistor R53, the drain is connected with the terminal 13 of the transformer T1, and the source is grounded through a resistor R56; pin 7 of the chip IC2 is connected with the switch module through a diode D6; the pin 8 of the chip IC2 passes through the resistors R47 and R48 connected in parallel and then is connected to the terminal 2 of the transformer T1 through the resistor R40 connected in series.
Preferably, the switch module includes:
a positive end of an external power supply anode, a negative end of an external power supply cathode, and triodes Q1 and Q2, wherein,
the positive terminal is connected with the No. 2 terminal of the transformer T1 through an inductor L2, and is grounded through a capacitor C52; the base of Q1 is connected with the positive terminal through a resistor R38 and an inductor L2, and is also connected with the collector of Q2; the collector of the Q1 is connected with the positive terminal through an inductor L2 and is also connected with the VIN terminal of the enabling module; the emitter of the Q1 is connected with a diode D6 of the overvoltage protection module through a resistor R39, and is also connected with the base of the Q2; the emitter of Q2 is connected to diode D6 of the overvoltage protection module, and the collector of Q2 is connected to ground through diode D7.
Preferably, the enabling module comprises:
comparator IC2A, and comparator IC2B, wherein,
the non-inverting input end of the IC2A is connected with the enable end EN1 of the control unit through a resistor R63 and a diode D10 which are connected in series, is connected with the VIN end of the switch module through a resistor R61, and is grounded through a capacitor C69 and a resistor R69 which are connected in parallel; an inverting input of IC2A coupled to a non-inverting input of IC 2B; a feedback resistor R59 is connected between the non-inverting input end and the output end of the IC2A in a bridging manner;
the non-inverting input end of the IC2B is connected with the No. 8 pin of the chip IC2 in the overvoltage protection module through a resistor R71, and is grounded through a capacitor C71 and a resistor R74 which are connected in parallel; the inverting input end of the IC2B is grounded through a capacitor C73 and a resistor R75 which are connected in parallel; the output terminal of the IC2B is connected to the output terminal of the U1 through the series-connected diodes D11 and D12, and to the inverting input terminal of the IC2B through the series-connected diodes D11 and D12 and the feedback resistor R76.
Preferably, the voltage stabilizing module includes:
MOS transistors Q3, Q4, Q6, wherein,
the gate of the Q3 is connected with the terminal No. 10 of the transformer T1, the source is grounded and is connected with the terminal No. 10 of the transformer T1 through a resistor R42, and the drain is connected with the terminal No. 8 of the transformer T1; a resistor R41 and a capacitor C58 are connected in series between the drain and the source of the Q3, and a voltage V0 is output; the gate of the Q4 is connected with the terminal No. 8 of the transformer T1 through a resistor R45, and is grounded through a resistor R44, the drain is connected with the terminal No. 4 of the transformer T1, and the source is grounded; the gate of Q6 is connected to terminal No. 11 of transformer T1 through diode D9 and resistor R49 in parallel, while connected to terminal No. 4 of transformer T1 through resistor R50; the drain of Q6 is grounded through capacitor C62, and the source is connected with the No. 4 terminal of T1;
further comprising: an inductor L1, capacitors C54, C57, C55, C56 and a diode D8 which are connected in parallel,
the parallel circuit is connected in series with an inductor L1 and then connected between the drain and the source of the MOS transistor Q3 to output a voltage of +/-28V; the input end of the inductor L1 is externally connected with a power supply VCC through a diode D5 and is grounded through a capacitor C51.
Preferably, the filtering module includes:
a TVS diode U11, wherein,
the resistors R65 and R73 are grounded after being connected in series, one end of the resistor after being connected in series is connected with the voltage output end of plus or minus 28V, and the other end of the resistor is grounded; the resistors R67 and R72 are connected in series and then grounded, one end of the series resistor is connected with the voltage output end of plus or minus 28V, and the other end of the series resistor is grounded.
According to a second aspect of the embodiments of the present invention, there is provided a satellite vehicle-mounted device including:
the dual power supply switching system is provided.
The technical scheme provided by the embodiment of the utility model can have the following beneficial effects:
when the control unit receives a control instruction of the upper computer and needs signal transmission, the control unit sends an enabling opening instruction to open the first power supply assembly and close the second power supply assembly; when the signal is required to be received, the control unit sends an enabling opening instruction to open the second power supply assembly and close the first power supply assembly, so that the alternate work of the signal transmitting circuit and the signal receiving circuit is realized. The technical scheme provided by the utility model is simple to deploy and convenient to operate, reduces the manual investment due to no need of manual monitoring, avoids the problem of misoperation caused by manual operation, and has the advantages of higher reliability, good user experience and high satisfaction.
In addition, it can be understood that, in the technical scheme provided in this embodiment, the switching between signal transmission and signal reception is realized by controlling the power supply of the transmission signal and the reception signal through the dual power supply switching system, when the transmission signal circuit works, the reception signal circuit does not work, and similarly, when the reception signal circuit works, the transmission signal does not work, but in the manual switch switching mode in the prior art, two power supplies are working, one power supply is working with load, and the other power supply is working without load.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the utility model, as claimed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the utility model and together with the description, serve to explain the principles of the utility model.
FIG. 1 is a schematic block diagram illustrating a dual power supply switching system in accordance with an exemplary embodiment;
FIG. 2 is a circuit schematic of a first output current sampling unit shown in accordance with an exemplary embodiment;
FIG. 3 is a circuit schematic of a first output voltage sampling unit shown in accordance with an exemplary embodiment;
fig. 4A to 4B are circuit schematic diagrams illustrating a communication circuit in which a single chip microcomputer of the control unit communicates with an upper computer according to an exemplary embodiment;
FIG. 5 is a circuit schematic of an overvoltage protection module of a first power supply component shown in accordance with an exemplary embodiment;
FIG. 6 is a circuit schematic of a switch module of a first power supply assembly shown in accordance with an exemplary embodiment;
FIG. 7 is a circuit schematic of an enable module of a first power supply component shown in accordance with an exemplary embodiment;
FIG. 8 is a circuit schematic of a voltage regulation module of a first power supply component shown in accordance with an exemplary embodiment;
FIG. 9 is a circuit schematic of a filtering module of a first power supply assembly shown in accordance with an exemplary embodiment;
fig. 10 is a flowchart illustrating the operation of the dual power supply switching system of the beidou No. three onboard device according to an exemplary embodiment.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the utility model, as detailed in the appended claims.
FIG. 1 is a schematic block diagram illustrating a dual power supply switching system, as shown in FIG. 1, including:
an upper computer (11) is arranged on the machine,
a first power supply assembly 12 for supplying power to the signal transmission circuit 15;
a second power supply unit 13 for supplying power to the signal receiving circuit 16;
and the control unit 14 is connected with the upper computer 11 and controls the first power supply component 12 and the second power supply component 13 to be turned on or off by enabling, so that the working states of the signal transmitting circuit 15 and the signal receiving circuit 16 are switched.
In fig. 1, reference numeral 10 denotes a power supply externally connected to the first power supply unit and the second power supply unit, and the power supply 10 may be a battery or a generator rectifying bus.
It should be noted that the technical solution provided in this embodiment is applicable to various application scenarios requiring alternate working of signal transmission and signal reception, including but not limited to: the power supply system supplies power to Beidou vehicle-mounted equipment, GPS vehicle-mounted equipment, GLONASS vehicle-mounted equipment, Galileo vehicle-mounted equipment and the like.
Preferably, the technical scheme provided by the embodiment is particularly suitable for an application scene of supplying power to the Beidou third vehicle-mounted equipment.
It can be understood that, in the technical scheme provided by this embodiment, when the control unit receives the control instruction of the upper computer and needs to transmit a signal, the control unit sends an enable-to-open instruction to open the first power supply assembly and close the second power supply assembly; when the signal is required to be received, the control unit sends an enabling opening instruction to open the second power supply assembly and close the first power supply assembly, so that the alternate work of the signal transmitting circuit and the signal receiving circuit is realized. The technical scheme provided by the embodiment is simple to deploy and convenient to operate, manual investment is reduced due to no need of manual monitoring, the problem of misoperation caused by manual operation is avoided, reliability is higher, user experience is good, and satisfaction is high.
In addition, it can be understood that, in the technical scheme provided in this embodiment, the switching between signal transmission and signal reception is realized by controlling the power supply of the transmission signal and the reception signal through the dual power supply switching system, when the transmission signal circuit works, the reception signal circuit does not work, and similarly, when the reception signal circuit works, the transmission signal does not work, but in the manual switch switching mode in the prior art, two power supplies are working, one power supply is working with load, and the other power supply is working without load.
Referring to fig. 1, preferably, the system further comprises:
a first output voltage sampling unit 17, and/or a first output current sampling unit 18;
the control unit 14 detects the output voltage and/or the output current of the first power supply module 12 through the first output voltage sampling unit 17 and/or the first output current sampling unit 18.
In a specific practice, the first output voltage sampling unit 17 may be a backward-flow diode component, and the first output current sampling unit 18 may be a sampling resistor.
Preferably, the system further comprises:
a second output voltage sampling unit 19, and/or a second output current sampling unit 20;
the control unit 14 detects the output voltage and/or the output current of the second power supply module 13 through the second output voltage sampling unit 19 and/or the second output current sampling unit 20.
It can be understood that the first output voltage sampling unit 17 is provided for the first power supply assembly, and/or the first output current sampling unit 18 is provided for the second power supply assembly, and/or the second output voltage sampling unit 19 is provided for the second power supply assembly, and/or the second output current sampling unit 20 is provided for monitoring the output voltage and/or the output current of the first power supply assembly 12 and the second power supply assembly 13 and uploading the output voltage and/or the output current to the upper computer through the control unit, so as to prompt the satellite vehicle-mounted device to output a voltage and/or current fault code.
Specifically, when the output voltage of the first power supply assembly exceeds or is lower than the voltage set value +/-0.5V, the output voltage of the first power supply assembly is judged to be in a fault state, the control unit sends the fault state of the output voltage of the first power supply assembly back to the upper computer, and the upper computer prompts a fault code of the output voltage of the first power supply assembly of the satellite vehicle-mounted equipment.
Further, when the output voltage of the second power supply assembly exceeds or is lower than the voltage set value +/-0.5V, the output voltage of the second power supply assembly is in a fault state, the control unit sends the fault state of the output voltage of the second power supply assembly back to the upper computer, and the upper computer outputs a fault code of the output voltage of the second power supply assembly of the satellite vehicle-mounted equipment.
Specifically, when the output current of the first power supply module exceeds the normal full-load working current by 1.2 times, the output current is judged to be in a fault state, the control unit sends the fault state of the output current of the first power supply module back to the upper computer, and the upper computer outputs a fault code of the output current of the first power supply module of the satellite vehicle-mounted equipment.
Further, when the output current of the second power supply assembly exceeds the normal full-load working current by 1.2 times, the output current is judged to be in a fault state, the control unit sends the fault state of the output current of the second power supply assembly back to the upper computer, and the upper computer outputs a fault code of the output current of the second power supply assembly of the satellite vehicle-mounted equipment.
It should be noted that, in a specific practice, the control unit may adopt a single chip microcomputer, a DSP processor, an FPGA controller, a PLC controller, or the like.
Preferably, the control unit adopts a single chip microcomputer with the model number of STM32F407VGT 6.
In a specific practice, the second output voltage sampling unit 19 may be a backward-flow diode component, and the second output current sampling unit 20 may be a sampling resistor.
In particular practice, the internal circuit structure of the first output current sampling unit 18 and the second output current sampling unit 20 may be the same. For better understanding of the first output current sampling unit 18 and the second output current sampling unit 20 provided in the present application, a schematic circuit diagram of the first output current sampling unit 18 is taken as an example to describe a specific implementation manner of the output current sampling unit.
Referring to fig. 2, fig. 2 shows a schematic circuit diagram of the first output current sampling unit 18, and as can be seen from fig. 2, the first output current sampling unit 18 includes:
two cascaded sampling modules of identical construction, wherein,
a first sampling module comprising: the chip U2 has, among other things,
a second sampling module comprising: the chip U3 has, among other things,
It should be noted that, since the operating voltage of the signal transmitting circuit 15 is ± 28V and the operating voltage of the signal receiving circuit 16 is ± 20V, when the second output current sampling unit 20 is connected, the terminals of the control unit 20V are respectively connected correspondingly.
In a specific practice, the internal circuit structures of the first output voltage sampling unit 17 and the second output voltage sampling unit 19 may be the same. In order to better understand the first output voltage sampling unit 17 and the second output voltage sampling unit 19 provided in the present application, a schematic circuit diagram of the first output voltage sampling unit 17 is taken as an example to describe a specific implementation manner of the output voltage sampling unit.
Referring to fig. 3, fig. 3 shows a schematic circuit diagram of the first output voltage sampling unit 17, and as can be seen from fig. 3, the first output voltage sampling unit 17 includes:
the non-inverting input terminals of the amplifiers D3 and D3 are connected with the VOUT 28V terminal of the control unit through a resistor, and are grounded through a resistor; the inverting input of D3 is connected to the output, which is connected to the 28V TEST terminal of the control unit.
It should be noted that, since the operating voltage of the signal transmitting circuit 15 is ± 28V and the operating voltage of the signal receiving circuit 16 is ± 20V, when the second output voltage sampling unit 19 is connected, the terminals of the control unit of 20V are connected correspondingly.
In a specific practice, the communication circuit for communicating the single chip microcomputer of the control unit with the upper computer is shown in fig. 4A and 4B, wherein a chip U9 in fig. 4A is a network interface chip of a model LAN8720, and is used for completing hardware communication between the network port and the single chip microcomputer; the transformer in fig. 4B is model HR911105A and is used to achieve electrical isolation of the portal input and output. Since fig. 4A and 4B are conventional circuits, the detailed circuit structure is not described herein.
In particular practice, the internal circuit structure of the first power supply component 12 and the second power supply component 13 may be identical. For a better understanding of the first power supply component 12 and the second power supply component 13 provided in the present application, a specific implementation of the first power supply component will now be described by taking as an example a schematic circuit diagram of the first power supply component 12.
Preferably, the first power supply component comprises:
the voltage of the transformer T1 is,
a switch module, an enabling module and an overvoltage protection module are arranged on the primary winding side of the transformer T1;
a voltage stabilizing module and a filtering module are arranged on the secondary winding side of the transformer T1;
the switch module is externally connected with a power supply and is connected with the enabling module; the enabling module is connected with the control unit and used for enabling and controlling the on-off of the switch module; the overvoltage protection module is used for controlling the output voltage of the switch module to be within a threshold range of the input voltage of the transformer T1;
the voltage stabilizing module is used for reducing the output voltage of the transformer T1 into the working voltage of the signal transmitting circuit; and the filtering module is used for removing burrs and spikes in the output voltage of the transformer T1.
Referring to fig. 5, preferably, the overvoltage protection module includes:
the chip IC2 is a chip on which, among other things,
the pin No. 1 of the chip IC2 is connected with the pin No. 2 through a resistor R46 and a capacitor C60 which are connected in parallel; the No. 3 pin is grounded through a capacitor C63, a resistor R55, a resistor R56 and a resistor R57 which are connected in parallel; pin No. 4 is grounded through a capacitor C64 and is connected with the base electrode of a triode Q7; the base electrode of the triode Q7 is also connected with the No. 3 pin of the chip IC2 through a capacitor C65 and connected with the No. 8 pin of the chip IC2 through a pull-up resistor R51; an emitter of the triode Q7 is connected with a pin No. 3 of the chip IC2 through a resistor R58; pin 6 of the chip IC2 is connected with the grid of the MOS tube Q5 through a resistor R52, the grid of the MOS tube Q5 is grounded through a resistor R53, the drain is connected with the terminal 13 of the transformer T1, and the source is grounded through a resistor R56; pin 7 of chip IC2 is connected to the switch module through diode D6 (see fig. 6); pin 8 of the chip IC2 passes through the parallel resistors R47 and R48, and then is connected to terminal 2 of the transformer T1 through the series resistor R40 (see fig. 6).
It will be appreciated that the overvoltage protection module shown in fig. 5 is primarily used to protect the voltage of the external power source from overvoltage.
Referring to fig. 6, preferably, the switch module includes:
a positive end of an external power supply anode, a negative end of an external power supply cathode, and triodes Q1 and Q2, wherein,
the positive terminal is connected with the No. 2 terminal of the transformer T1 through an inductor L2, and is grounded through a capacitor C52; the base of Q1 is connected with the positive terminal through a resistor R38 and an inductor L2, and is also connected with the collector of Q2; the collector of the Q1 is connected with the positive terminal through an inductor L2 and is also connected with the VIN terminal of the enabling module; the emitter of the Q1 is connected with a diode D6 of the overvoltage protection module through a resistor R39, and is also connected with the base of the Q2; the emitter of Q2 is connected to diode D6 of the overvoltage protection module, and the collector of Q2 is connected to ground through diode D7.
It can be understood that the switch module shown in fig. 6 mainly functions to control whether the power of the external power source is output to the transformer T1 for transformation.
Referring to fig. 7, preferably, the enabling module includes:
comparator IC2A, and comparator IC2B, wherein,
the non-inverting input end of the IC2A is connected with the enable end EN1 of the control unit through a resistor R63 and a diode D10 which are connected in series, is connected with the VIN end of the switch module through a resistor R61, and is grounded through a capacitor C69 and a resistor R69 which are connected in parallel; an inverting input of IC2A coupled to a non-inverting input of IC 2B; a feedback resistor R59 is connected between the non-inverting input end and the output end of the IC2A in a bridging manner;
the non-inverting input end of the IC2B is connected with the No. 8 pin of the chip IC2 in the overvoltage protection module through a resistor R71, and is grounded through a capacitor C71 and a resistor R74 which are connected in parallel; the inverting input end of the IC2B is grounded through a capacitor C73 and a resistor R75 which are connected in parallel; the output terminal of the IC2B is connected to the output terminal of the U1 through the series-connected diodes D11 and D12, and to the inverting input terminal of the IC2B through the series-connected diodes D11 and D12 and the feedback resistor R76.
Referring to fig. 8, preferably, the voltage stabilization module includes:
MOS transistors Q3, Q4, Q6, wherein,
the gate of the Q3 is connected with the terminal No. 10 of the transformer T1, the source is grounded and is connected with the terminal No. 10 of the transformer T1 through a resistor R42, and the drain is connected with the terminal No. 8 of the transformer T1; a resistor R41 and a capacitor C58 are connected in series between the drain and the source of the Q3, and a voltage V0 is output; the gate of the Q4 is connected with the terminal No. 8 of the transformer T1 through a resistor R45, and is grounded through a resistor R44, the drain is connected with the terminal No. 4 of the transformer T1, and the source is grounded; the gate of Q6 is connected to terminal No. 11 of transformer T1 through diode D9 and resistor R49 in parallel, while connected to terminal No. 4 of transformer T1 through resistor R50; the drain of Q6 is grounded through capacitor C62, and the source is connected with the No. 4 terminal of T1;
further comprising: an inductor L1, capacitors C54, C57, C55, C56 and a diode D8 which are connected in parallel,
the parallel circuit is connected in series with an inductor L1 and then connected between the drain and the source of the MOS transistor Q3 to output a voltage of +/-28V; the input end of the inductor L1 is externally connected with a power supply VCC through a diode D5 and is grounded through a capacitor C51.
It can be understood that the voltage stabilizing module shown in fig. 8 mainly functions to control the output voltage to be stabilized within the operating range of the load circuit.
It should be noted that, when the control unit enables the first power supply module to be turned on or off, the signal transmitting circuit may generate some back-sink current to enter the first power supply module, which may damage the internal components of the first power supply module, and in order to maintain the output voltage of the first power supply module and prevent the back-sink current, the diode D8 is connected to the output of the first power supply module.
Referring to fig. 9, preferably, the filtering module includes:
a TVS diode U11, wherein,
the resistors R65 and R73 are grounded after being connected in series, one end of the resistor after being connected in series is connected with the voltage output end of plus or minus 28V, and the other end of the resistor is grounded; the resistors R67 and R72 are connected in series and then grounded, one end of the series resistor is connected with the voltage output end of plus or minus 28V, and the other end of the series resistor is grounded.
It can be understood that the filtering module shown in fig. 9 mainly functions to filter out spikes and glitches in the output signal, so that the voltage output to the load is more stable.
A satellite vehicle-mounted device is shown according to an exemplary embodiment, comprising:
the dual power supply switching system is provided.
It should be noted that the technical solution provided in this embodiment is applicable to various satellite vehicle-mounted devices, including but not limited to: big dipper vehicle-mounted equipment, GPS vehicle-mounted equipment, GLONASS vehicle-mounted equipment, Galileo vehicle-mounted equipment etc..
Preferably, the technical scheme that this embodiment provided is particularly useful for big dipper No. three mobile unit.
In order to better understand the technical scheme provided by the embodiment, taking the beidou No. three vehicle-mounted device as an example, the working principle of the dual power supply switching system is explained as follows:
(1) when ground mobile unit need receive big dipper signal, send the received signal instruction through the host computer and give dual power supply switching system, dual power supply switching system makes second power supply module work through opening second power supply module and closing the enabling signal of first power supply module, simultaneously, makes first power supply module out of work.
(2) When ground vehicle-mounted equipment needs to transmit a ground signal to the Beidou satellite, a transmitting signal instruction is sent to the dual-power switching system through the upper computer, the dual-power switching system enables the first power supply assembly to work through closing the second power supply assembly and opening an enabling signal of the first power supply assembly, and meanwhile, the second power supply assembly does not work.
Referring to fig. 10, when the dual power supply switching system is applied to the third beidou car-mounted device, the battery or the generator rectifying bus serves as an input power supply, the control unit receives an instruction of the upper computer to perform performance control on the first power supply assembly and the second power supply assembly, the operation is performed according to the requirements of the actual car-mounted device, real-time navigation and time service can be realized, position report and short message communication can also be realized, and the control unit can intelligently switch the first power supply assembly and the second power supply assembly to control signal transmission and signal reception. When using the dual power supply switching system of this embodiment to the power supply of No. three on-vehicle communication equipment of big dipper, specific working process includes:
and step S1, the vehicle-mounted equipment is powered on and initialized. In the power-on initialization process, a battery or a generator rectifying bus supplies power to a single chip microcomputer of a control unit through a power converter, after the control unit is initialized, whether an upper computer sends an instruction is monitored all the time, if the instruction of the upper computer is not received, the single chip microcomputer of the control unit is in an inquiry state all the time, instruction signals of the upper computer are waited all the time, at the moment, a first power supply assembly and a second power supply assembly do not receive an enabling instruction of the single chip microcomputer of the control unit, the first power supply assembly and the second power supply assembly are in a non-action state, and power consumption does not exist.
Step S2, in the process of real-time navigation or accurate time service, when the upper computer sends a real-time navigation or accurate time service instruction, the singlechip of the control unit enables the first power supply assembly and closes the second power supply assembly after inquiring the real-time navigation or accurate time service instruction, and the signal transmitting circuit transmits a signal through the transmitting antenna to communicate with the Beidou satellite III; the second power supply assembly receives a singlechip closing instruction of the control unit, and at the moment, the second power supply assembly does not output voltage, and the signal receiving circuit does not work; after the single chip microcomputer of the control unit enables the first power supply assembly, the output voltage and the output current of the first power supply assembly are monitored, the monitored output voltage and output current information are transmitted back to the upper computer, and the upper computer can obtain the working state information of the first power supply assembly.
Step S3, in the process of position report and short message communication, when the upper computer sends a position report or a short message communication instruction, the singlechip of the control unit inquires the position report or the short message communication instruction, the singlechip of the control unit enables the second power supply assembly and closes the first power supply assembly, and the signal receiving circuit receives the position report and the short message information of the Beidou third satellite through the receiving antenna; the first power supply assembly receives a singlechip closing instruction of the control unit, and at the moment, the first power supply assembly does not output voltage, and the signal transmitting circuit does not work; after the singlechip of the control unit enables the second power supply assembly, the output voltage and the output current of the second power supply assembly are monitored, the monitored output voltage and output current information are transmitted back to the upper computer, and the upper computer can obtain the working state information of the second power supply assembly.
It should be noted that the start standby power of the third beidou vehicle-mounted device is about 5W, the output voltage of the first power supply assembly is 28V, the maximum output power is 150W, the output voltage of the second power supply assembly is 20V, and the maximum output power is 60W. When the vehicle-mounted equipment is in real-time navigation or accurate teaching, after the control unit enables the first power supply assembly, the single chip microcomputer of the control unit detects that the output voltage of the first power supply assembly is 28 +/-0.5V and the output current is within 5.5A, the control unit judges that the first power supply assembly works in a normal state, and if the output voltage and the output current are not within the range, the control unit considers that the first power supply assembly works in an abnormal state; similarly, when the vehicle-mounted device is in a position report or short message communication, after the control unit enables the second power supply assembly, the single chip microcomputer of the control unit detects that the output voltage of the second power supply is 20 +/-0.5V and the output current is within 3A, the control unit judges that the second power supply assembly works in a normal state, and if the output voltage and the output current are not within the range, the control unit judges that the second power supply assembly works in an abnormal state; the control unit uploads the output voltage fault or output current fault information of the first power supply assembly or the second power supply assembly to the upper computer for maintenance personnel to overhaul and maintain.
It can be understood that, in the technical scheme provided by this embodiment, when the control unit receives the control instruction of the upper computer and needs to transmit a signal, the control unit sends an enable-to-open instruction to open the first power supply assembly and close the second power supply assembly; when the signal is required to be received, the control unit sends an enabling opening instruction to open the second power supply assembly and close the first power supply assembly, so that the alternate work of the signal transmitting circuit and the signal receiving circuit is realized. The technical scheme provided by the embodiment is simple to deploy and convenient to operate, manual investment is reduced due to no need of manual monitoring, the problem of misoperation caused by manual operation is avoided, reliability is higher, user experience is good, and satisfaction is high.
In addition, it can be understood that, in the technical scheme provided in this embodiment, the switching between signal transmission and signal reception is realized by controlling the power supply of the transmission signal and the reception signal through the dual power supply switching system, when the transmission signal circuit works, the reception signal circuit does not work, and similarly, when the reception signal circuit works, the transmission signal does not work, but in the manual switch switching mode in the prior art, two power supplies are working, one power supply is working with load, and the other power supply is working without load.
It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments.
It should be noted that the terms "first," "second," and the like in the description of the present invention are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Further, in the description of the present invention, the meaning of "a plurality" means at least two unless otherwise specified.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A dual power switching system, comprising:
an upper computer is arranged on the main body,
the first power supply assembly is used for supplying power to the signal transmitting circuit;
the second power supply assembly is used for supplying power to the signal receiving circuit;
and the control unit is connected with the upper computer and controls the first power supply assembly and the second power supply assembly to be opened or closed through enabling so as to switch the working states of the signal transmitting circuit and the signal receiving circuit.
2. The system of claim 1, further comprising:
the first output voltage sampling unit and/or the first output current sampling unit;
the control unit detects the output voltage and/or the output current of the first power supply assembly through the first output voltage sampling unit and/or the first output current sampling unit.
3. The system of claim 1, further comprising:
the second output voltage sampling unit and/or the second output current sampling unit;
the control unit detects the output voltage and/or the output current of the second power supply assembly through the second output voltage sampling unit and/or the second output current sampling unit.
4. The system of claim 1, wherein the first power supply component comprises:
the voltage of the transformer T1 is,
a switch module, an enabling module and an overvoltage protection module are arranged on the primary winding side of the transformer T1;
a voltage stabilizing module and a filtering module are arranged on the secondary winding side of the transformer T1;
the switch module is externally connected with a power supply and is connected with the enabling module; the enabling module is connected with the control unit and used for enabling and controlling the on-off of the switch module; the overvoltage protection module is used for controlling the output voltage of the switch module to be within a threshold range of the input voltage of the transformer T1;
the voltage stabilizing module is used for reducing the output voltage of the transformer T1 into the working voltage of the signal transmitting circuit; and the filtering module is used for removing burrs and spikes in the output voltage of the transformer T1.
5. The system of claim 4, wherein the overvoltage protection module comprises:
the chip IC2 is a chip on which, among other things,
the pin No. 1 of the chip IC2 is connected with the pin No. 2 through a resistor R46 and a capacitor C60 which are connected in parallel; the No. 3 pin is grounded through a capacitor C63, a resistor R55, a resistor R56 and a resistor R57 which are connected in parallel; pin No. 4 is grounded through a capacitor C64 and is connected with the base electrode of a triode Q7; the base electrode of the triode Q7 is connected with the No. 3 pin of the chip IC2 through a capacitor C65 and is connected with the No. 8 pin of the chip IC2 through a pull-up resistor R51; an emitter of the triode Q7 is connected with a pin No. 3 of the chip IC2 through a resistor R58; pin 6 of the chip IC2 is connected with the grid of the MOS tube Q5 through a resistor R52, the grid of the MOS tube Q5 is grounded through a resistor R53, the drain is connected with the terminal 13 of the transformer T1, and the source is grounded through a resistor R56; pin 7 of the chip IC2 is connected with the switch module through a diode D6; the pin 8 of the chip IC2 passes through the resistors R47 and R48 connected in parallel and then is connected to the terminal 2 of the transformer T1 through the resistor R40 connected in series.
6. The system of claim 5, wherein the switch module comprises:
a positive end of an external power supply anode, a negative end of an external power supply cathode, and triodes Q1 and Q2, wherein,
the positive terminal is connected with the No. 2 terminal of the transformer T1 through an inductor L2, and is grounded through a capacitor C52; the base of Q1 is connected with the positive terminal through a resistor R38 and an inductor L2, and is also connected with the collector of Q2; the collector of the Q1 is connected with the positive terminal through an inductor L2 and is also connected with the VIN terminal of the enabling module; the emitter of the Q1 is connected with a diode D6 of the overvoltage protection module through a resistor R39, and is also connected with the base of the Q2; the emitter of Q2 is connected to diode D6 of the overvoltage protection module, and the collector of Q2 is connected to ground through diode D7.
7. The system of claim 6, wherein the enabling module comprises:
comparator IC2A, and comparator IC2B, wherein,
the non-inverting input end of the IC2A is connected with the enable end EN1 of the control unit through a resistor R63 and a diode D10 which are connected in series, is connected with the VIN end of the switch module through a resistor R61, and is grounded through a capacitor C69 and a resistor R69 which are connected in parallel; an inverting input of IC2A coupled to a non-inverting input of IC 2B; a feedback resistor R59 is connected between the non-inverting input end and the output end of the IC2A in a bridging manner;
the non-inverting input end of the IC2B is connected with the No. 8 pin of the chip IC2 in the overvoltage protection module through a resistor R71, and is grounded through a capacitor C71 and a resistor R74 which are connected in parallel; the inverting input end of the IC2B is grounded through a capacitor C73 and a resistor R75 which are connected in parallel; the output terminal of the IC2B is connected to the output terminal of the U1 through the series-connected diodes D11 and D12, and to the inverting input terminal of the IC2B through the series-connected diodes D11 and D12 and the feedback resistor R76.
8. The system of claim 7, wherein the voltage regulation module comprises:
MOS transistors Q3, Q4, Q6, wherein,
the gate of the Q3 is connected with the terminal No. 10 of the transformer T1, the source is grounded and is connected with the terminal No. 10 of the transformer T1 through a resistor R42, and the drain is connected with the terminal No. 8 of the transformer T1; a resistor R41 and a capacitor C58 are connected in series between the drain and the source of the Q3, and a voltage V0 is output; the gate of the Q4 is connected with the terminal No. 8 of the transformer T1 through a resistor R45, and is grounded through a resistor R44, the drain is connected with the terminal No. 4 of the transformer T1, and the source is grounded; the gate of Q6 is connected to terminal No. 11 of transformer T1 through diode D9 and resistor R49 in parallel, while connected to terminal No. 4 of transformer T1 through resistor R50; the drain of Q6 is grounded through capacitor C62, and the source is connected with the No. 4 terminal of T1;
further comprising: an inductor L1, capacitors C54, C57, C55, C56 and a diode D8 which are connected in parallel,
the parallel circuit is connected in series with an inductor L1 and then connected between the drain and the source of the MOS transistor Q3 to output a voltage of +/-28V; the input end of the inductor L1 is externally connected with a power supply VCC through a diode D5 and is grounded through a capacitor C51.
9. The system of claim 8, wherein the filtering module comprises:
a TVS diode U11, wherein,
pin 1 of U11 is connected with + 28V voltage output end, and is grounded through resistor R62 and reference voltage source connected in series, wherein, U12 model is TLV431, and is conducted when it exceeds 2.5V; the No. 2 pin is grounded through a resistor R68, a capacitor C68 and a capacitor C70 which are connected in series; the No. 3 pin is connected with the No. 2 pin of the chip IC2 in the overvoltage protection module through a capacitor C66 and a resistor R60 which are connected in parallel, and is grounded through a resistor R64; the No. 4 pin is connected with the No. 8 pin of the chip IC2 in the overvoltage protection module and is grounded through a capacitor C67;
the resistors R65 and R73 are grounded after being connected in series, one end of the resistor after being connected in series is connected with the voltage output end of plus or minus 28V, and the other end of the resistor is grounded; the resistors R67 and R72 are connected in series and then grounded, one end of the series resistor is connected with the voltage output end of plus or minus 28V, and the other end of the series resistor is grounded.
10. A satellite vehicle-mounted device, characterized by comprising:
the dual power switching system of any one of claims 1-9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120815498.2U CN215706135U (en) | 2021-04-20 | 2021-04-20 | Dual-power switching system and satellite vehicle-mounted equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120815498.2U CN215706135U (en) | 2021-04-20 | 2021-04-20 | Dual-power switching system and satellite vehicle-mounted equipment |
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