CN216981508U - Negative voltage protection circuit of phased array radar antenna - Google Patents
Negative voltage protection circuit of phased array radar antenna Download PDFInfo
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- CN216981508U CN216981508U CN202122986349.5U CN202122986349U CN216981508U CN 216981508 U CN216981508 U CN 216981508U CN 202122986349 U CN202122986349 U CN 202122986349U CN 216981508 U CN216981508 U CN 216981508U
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Abstract
The utility model discloses a negative voltage protection circuit of a phased array radar antenna, and belongs to the technical field of phased array radar antennas. The power amplifier comprises a leakage voltage power supply, a grid voltage power supply, a load switch, a negative voltage monitor and a power amplifier; the drain voltage power supply and the grid voltage power supply are respectively used for providing drain voltage and grid voltage required by work for the power amplifier; the negative voltage monitor is connected with the output end of the grid voltage power supply and is used for monitoring the grid voltage output by the grid voltage power supply; the load switch is connected with the output end of the leakage voltage power supply and is used for starting or disconnecting the power supply of the subsequent load; the negative voltage monitor is in signal connection with the load switch, monitors the voltage value of the grid voltage and outputs a reset signal to control the on and off of the load switch. The negative voltage protection circuit adopts a full hardware circuit design, monitors the under-voltage abnormality of the grid voltage through the negative voltage monitor, and directly controls the load switch to supply power to the subsequent load when the abnormality occurs, thereby ensuring the normal work of the power amplifier and preventing the power amplifier from being burnt.
Description
Technical Field
The utility model relates to the field of phased array antennas, in particular to a negative voltage protection circuit of a phased array radar antenna.
Background
A phased array antenna is an antenna that changes the shape of a pattern by controlling the feeding phase of a radiating element in the array antenna. In order to increase the detection distance and accuracy of the antenna, an effective means is to increase the radiation power of a single antenna radiation unit, and a problem that a high-power amplifier (hereinafter referred to as a power amplifier) is required to be added at the final stage of the antenna, and the high-power amplifier is usually manufactured by using a GaAs or GaN process, so that a leakage voltage and a grid voltage are required to be supplied for power, generally, the leakage voltage is a positive voltage source, and the grid voltage is a negative voltage source. When the power amplifier works, leakage voltage (ampere-level large current) and grid voltage (microampere-level small current) must exist at the same time, and if grid voltage does not exist due to factors such as poor instantaneous connection or power failure connected in front in the working process, the leakage voltage power supply current is very large directly, and devices are easily burnt instantly. Therefore, a safe and reliable protection circuit is needed to ensure the normal operation of the power amplifier. The current circuit structure needs to realize power supply control of grid voltage leakage voltage, generally needs to carry out program design through a controller, and causes waste of software resources, so that the application provides a phased array radar antenna negative pressure protection circuit realized by a full hardware circuit.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the problems of the phased array radar antenna in the prior art, and provides a negative pressure protection circuit of the phased array radar antenna, so that the power amplifier of the phased array radar antenna is protected to keep a stable working state in the processes of starting, working, shutting down and the like, the power amplifier is prevented from being burnt by heat, and the circuit structure is realized by a full-hardware circuit, so that software resources can be saved.
In order to achieve the above object, the technical solution of the present invention is as follows:
a negative voltage protection circuit of a phased array radar antenna is characterized by comprising a leakage voltage power supply, a grid voltage power supply, a load switch, a negative voltage monitor and a power amplifier; the output ends of the drain voltage power supply and the grid voltage power supply are respectively connected with a drain electrode and a grid electrode of the power amplifier; the negative voltage monitor is connected with the output end of the grid voltage power supply and is used for monitoring the output voltage of the grid voltage power supply; the negative pressure monitor is in signal connection with the load switch, and the load switch is connected to the output end of the leakage voltage power supply and used for starting or disconnecting the power supply of the power amplifier under the control of the negative pressure monitor.
The grid piezoelectric source and drain voltage source is connected with the external interface, and the grid piezoelectric source and drain voltage source is connected with the external interface.
Furthermore, the device also comprises an auxiliary power supply, wherein the input end of the auxiliary power supply is connected with an external interface, and the output end of the auxiliary power supply is connected with the negative pressure monitor and the load switch.
Furthermore, the physical interface of the external interface is in the form of an external cable, a connector or a printed board.
Furthermore, the leakage voltage power supply, the grid voltage power supply and the auxiliary power supply all use a linear voltage stabilizer to convert external high-voltage power supply input through an external interface into low-voltage power supply output required by a rear-end load.
Further, the linear voltage regulator is an LDO converter or a DC-DC converter.
Further, the load switch adopts an NCP45521 type controllable load power switch.
The utility model has the beneficial effects that:
1. the negative pressure protection circuit is realized by adopting a full hardware circuit, an additional controller is not needed to realize the control function, the software resource can be saved, when the grid voltage is overhigh and other common faults exist in the power supply path, the negative pressure monitor can quickly detect the faults and directly control the load switch to be closed in time through the reset signal, the external output is cut off, and the influence on the front-end input power supply is avoided;
2. the negative pressure protection circuit can accurately control the set negative pressure threshold;
3. the negative-pressure protection circuit uses the power module with higher conversion efficiency and lower ripple noise as the type selection of the direct-current converter, and provides higher power output while having smaller volume;
4. the negative pressure protection circuit uses the logic gate and the integrated chip circuit as functional components, can be integrated in a product with a smaller volume, and reduces the volume and the weight of the phased array radar antenna.
Drawings
In order to clearly illustrate the differences between the negative voltage protection circuit according to the utility model and the prior art solutions, the following brief description of the utility model and the drawings needed for describing the prior art will be given. It is obvious that the references to the drawings are only to some embodiments of the utility model and should not be considered as limiting the scope, from which other related drawings can be derived by a person skilled in the art without inventive effort.
Fig. 1 is a block diagram showing the connections of a negative voltage protection circuit according to an embodiment of the present invention.
In the figure:
11. external interface, 12, auxiliary power supply, 13, leakage voltage power supply, 14, grid voltage power supply, 15, negative voltage monitor, 16, load switch, 17 and power amplifier.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is specifically noted that the following examples are only for illustrating how the present invention is embodied, and are not intended to limit the scope of the present invention. Likewise, the following examples are only some but not all examples of the present invention, and all other examples obtained by one of ordinary skill in the art without any inventive step are within the scope of the present invention.
Example 1
The embodiment provides a negative voltage protection circuit of a phased array radar antenna, which comprises a leakage voltage power supply 13, a grid voltage power supply 14, a load switch 16, a negative voltage monitor 15 and a power amplifier 17; the output ends of the drain voltage power supply 13 and the grid voltage power supply 14 are respectively connected with the drain electrode and the grid electrode of the power amplifier; the negative voltage monitor 15 is connected to the output end of the grid voltage power supply 14 and is used for monitoring the output voltage of the grid voltage power supply; the negative pressure monitor 15 is in signal connection with a load switch 16, and the load switch 16 is connected to the output end of the leakage voltage power supply and used for starting or cutting off the power supply of the power amplifier under the direct control of the negative pressure monitor 15.
The negative pressure protection circuit in the utility model is realized by adopting a full hardware circuit, so that the software resource can be saved, when the common faults of grid voltage overhigh and the like exist in a power supply channel, the negative pressure monitor can quickly detect the faults and directly control the load switch to be closed in time through the reset signal, the external output is cut off, and the influence on a front-end input power supply is avoided.
Example 2
The utility model provides a negative voltage protection circuit of a phased array radar antenna, which is used for power protection of the phased array radar antenna. The phased array radar antenna assembly comprises a radio frequency CMOS chip and the negative pressure protection circuit, wherein the radio frequency CMOS chip is a main functional assembly of the array surface, an input power supply of the radio frequency CMOS chip is connected with the power supply output of the negative pressure protection circuit, and the negative pressure protection circuit is used for supplying power to the radio frequency CMOS chip.
In this embodiment, the negative voltage protection circuit realizes that the external high voltage power supply is converted into the internal low voltage power supply, and simultaneously realizes the grid voltage monitoring and the microprocessor program software control of the internal power amplifier of the array surface through the discrete component and the integrated circuit, thereby realizing the negative voltage protection function of combining software and hardware of the power amplifier. While realizing effective work, the device realizes accurate control and reduces the weight and volume of the product.
Fig. 1 is a block diagram illustrating a negative pressure protection system according to an embodiment of the present invention. This embodiment is based on this utility model power management design technology designed phased array radar antenna negative pressure protection circuit. The circuit comprises an external interface 11, an auxiliary power supply 12, a leakage voltage power supply 13, a grid voltage power supply 14, a negative pressure monitor 15, a load switch 16 and a power amplifier 17.
The external interface 11 is a positive high voltage and a negative high voltage input in a certain voltage range, and the physical interface form of the external interface can be one or more combinations of external cables, connectors, printed circuit boards, wiring and other structures, and is used for providing power input for the phased array radar antenna power circuit.
The auxiliary power supply 12 is built using passive devices (including but not limited to resistors, capacitors, fuses, discharge tubes, thyristors, etc.) and integrated circuits. For converting an external high-voltage power input through the input external interface 11 into a low-voltage power output required by a back-end component, for example, in this embodiment, the voltage required for operation is provided by the following components of the negative voltage monitor 15 and the load switch 16. In this embodiment, the auxiliary power supply 12 may be an integrated circuit chip of LTC1963 type.
The leakage voltage power supply 13 uses a LDO converter (including but not limited to LDO, and may also be other conversion circuit, such as DC-DC converter, etc.) as a main functional component, and also uses a passive device (including but not limited to resistor, capacitor, fuse, discharge tube, thyristor, etc.) to build a DC converter circuit, which is used to convert an external high voltage power input inputted through the input external interface 11 into a low voltage power output required by a back end component. During design, the component power supply with a large power requirement uses the DC-DC switching power supply module as a functional main body to provide power for the array surface power component according to the specific requirements of the back end component. Aiming at the power supply requirement with strict ripple wave requirement, the required 'clean' power supply is provided by cascading low noise and high PSRR (noise rejection ratio) linear voltage regulators. The dc converter circuit may have multiple positive power supplies at the same time, depending on the situation. Each direct current converter is provided with an enable switch which can be turned on and off according to an external logic control signal, so that the direct current converters can be controlled by a time sequence control circuit and a threshold circuit and can be directly turned off when necessary. In this embodiment, the leakage voltage power supply 13 may be an integrated circuit chip of LTC1963 type.
The gate voltage power supply 14 uses an LDO converter (including but not limited to LDO, and may also be other conversion circuit, such as a DC-DC converter, or a Charge Pump) as a main functional component, and further uses a passive device (including but not limited to a resistor, a capacitor, a fuse, a discharge tube, a thyristor, etc.) to build a DC converter circuit, which is used to convert an external high voltage negative power input inputted through the input external interface 11 into a low voltage negative power output required by a back end component, for example, to supply power to the gate voltage of the power amplifier 17. In this embodiment, the gate voltage power supply 14 may be an integrated circuit chip of LTC1983 type.
The negative pressure monitor 15 uses an integrated circuit as a main monitoring device of the low-voltage ground negative pressure power supply, monitors the low negative pressure (i.e. the grid voltage required by the operation of the power amplifier 17) converted by the grid voltage power supply 14 in real time, outputs a hardware reset signal when the grid voltage is under-voltage or over-voltage abnormal, directly controls the load switch 16 to be closed immediately, and does not supply power to the back end component any more. In this embodiment, the negative voltage monitor 15 may be an integrated circuit chip of LTC2909 type.
The load switch 16 is controlled by the negative pressure monitor 15, and the load switch 16 can be turned off or on in time. The power amplifier comprises a related circuit breaking and discharging closing structural component, and when the power amplifier normally works, a load switch 16 is normally opened under the control of a voltage monitor 15, so that a leakage voltage power supply 13 outputs a low-positive voltage power supply to a leakage voltage power supply end of a power amplifier 17; meanwhile, the discharge closing component is in a failure state and does not play a discharge role. When the negative pressure monitor 15 detects an abnormal state (the grid voltage is too high), the load switch 16 is controlled to be closed, a channel between the power output of the leakage voltage power supply 13 and the power amplifier 17 is cut off, meanwhile, the closed discharge component enters a rapid discharge state, and the residual electric energy of the power supply path is rapidly discharged through the discharge resistor and the discharge field effect tube, so that the situation that the grid voltage is too high (even possibly 0V) while the leakage voltage power supply still exists in the power amplifier 17 is avoided, and the effect of avoiding the failure (damage) of the power amplifier 17 is achieved. In this embodiment, the load switch 16 may be a controllable load power switch of the NCP45521 type.
The working principle of the specific implementation circuit is as follows:
the external interface 11 supplies power to the auxiliary power supply 12 and the leakage voltage power supply 13, and the auxiliary power supply 12 supplies power to the negative pressure monitor 15 and the load switch 16 through voltage conversion; after the negative voltage monitor 15 starts to supply power, the output voltage of the grid voltage power supply 14 is monitored according to the voltage set value of the monitoring point, a reset signal is given to be high level under the condition that the grid voltage is overhigh, and an enabling pin of a rear-stage load switch 16 is opened; the leakage voltage power supply 13 is supplied to a load switch 16 through voltage conversion, and the load switch 16 is controlled by a negative pressure monitor 15 to supply leakage voltage power to a power amplifier 17. Meanwhile, the external interface 11 supplies power to the grid voltage power supply 14, and the grid voltage power supply 14 supplies grid voltage power to the power amplifier 17 through voltage conversion.
In the embodiments provided in the present invention, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described embodiments are merely illustrative, and the division of a module or unit is merely a logical division of functions, and there may be other divisions when implemented, for example, a plurality of components may be combined or may be integrated into another system. In addition, the connections between the illustrated components may be made through various types of external cables, connectors, printed circuit board traces, and the like, and are not limited to a specific connection type.
It will be evident to those skilled in the art that the present application is not limited to the details of the foregoing illustrative embodiments, and that the design techniques described herein may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and any reference signs shall not be construed as limiting the claims concerned.
Therefore, the above description is only a partial embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent devices or equivalent processes performed by the present invention, or directly or indirectly applied to other related technical fields, which are all included in the present invention, are also included in the scope of the present invention.
Claims (7)
1. A negative voltage protection circuit of a phased array radar antenna is characterized by comprising a leakage voltage power supply (13), a grid voltage power supply (14), a load switch (16), a negative voltage monitor (15) and a power amplifier (17); the output ends of the drain voltage power supply (13) and the grid voltage power supply (14) are respectively connected with the drain electrode and the grid electrode of the power amplifier (17); the negative pressure monitor (15) is connected to the output end of the grid voltage power supply (14) and is used for monitoring the output voltage of the grid voltage power supply (14); the negative pressure monitor (15) is in signal connection with a load switch (16), and the load switch (16) is connected to the output end of the leakage voltage power supply (13) and used for starting or disconnecting the power supply of the power amplifier (17) under the control of the negative pressure monitor (15).
2. The negative voltage protection circuit of the phased array radar antenna according to claim 1, further comprising an external interface (11), wherein the external interface (11) is used for providing positive high voltage and negative high voltage of external input, and the input ends of the grid voltage power supply (14) and the leakage voltage power supply (13) are connected with the external interface (11).
3. The negative voltage protection circuit of the phased array radar antenna according to claim 2, further comprising an auxiliary power supply (12), wherein an input terminal of the auxiliary power supply (12) is connected to the external interface (11), and an output terminal of the auxiliary power supply is connected to the negative voltage monitor (15) and the load switch (16).
4. The negative voltage protection circuit of a phased array radar antenna according to claim 2, characterized in that the physical interface of the external interface (11) is in the form of an external cable, connector or printed board trace.
5. The negative voltage protection circuit of the phased array radar antenna, according to claim 3, wherein the leakage voltage power supply (13), the grid voltage power supply (14) and the auxiliary power supply (12) all use a linear regulator to convert an external high voltage power supply input through the external interface (11) into a low voltage power supply output required by a back end load.
6. The negative voltage protection circuit of claim 5, wherein the linear regulator is an LDO converter or a DC-DC converter.
7. The negative voltage protection circuit for a phased array radar antenna according to claim 1, characterized in that the load switch (16) is a NCP45521 type controllable load power switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122986349.5U CN216981508U (en) | 2021-12-01 | 2021-12-01 | Negative voltage protection circuit of phased array radar antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122986349.5U CN216981508U (en) | 2021-12-01 | 2021-12-01 | Negative voltage protection circuit of phased array radar antenna |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216981508U true CN216981508U (en) | 2022-07-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122986349.5U Active CN216981508U (en) | 2021-12-01 | 2021-12-01 | Negative voltage protection circuit of phased array radar antenna |
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| Country | Link |
|---|---|
| CN (1) | CN216981508U (en) |
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2021
- 2021-12-01 CN CN202122986349.5U patent/CN216981508U/en active Active
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