XXX-X-XXXX-XXXX-X/XX/$XX.00 ©20XX IEEE
Innovative Under- and Overvoltage Protection
Technology for Aerospace SAR Power Supply
Keyong GE
Application Satellite Power System
Department
Shanghai Institute of Space Power-
Sources
Shanghai, China
keyong_ge@163.com
Yang ZHAO
Application Satellite Power System
Department
Shanghai Institute of Space Power-
Sources
Shanghai, China
zy18217403668@163.com
Chuanzhou SHI
Application Satellite Power System
Department
Shanghai Institute of Space Power-
Sources
Shanghai, China
529170429@qq.com
Chao WANG
Application Satellite Power System
Department
Shanghai Institute of Space Power-
Sources
Shanghai, China
570296862@qq.com
Lijuan LIU
Space Science Power System
Department
Shanghai Institute of Space Power-
Sources
Shanghai, China
liulijuan36@126.com
Abstract—The input under- and overvoltage protection
(UOVP) is an indispensable component for the aerospace
Synthetic Aperture Radar (SAR) power supply system to
prevent the damage caused by a power bus failure. This paper
proposes an innovative input under- and overvoltage
protection technology, which is suitable for Aerospace SAR
Power supply. This technology integrates the input under-
and overvoltage protection function into the distribution
switch control, which greatly reduces the number of
components. At the same time, its fault interlock technology
can avoid damage caused by the oscillation, which is
generated by repeated restarts near the protection threshold.
The protection technology has great advantages in reducing
system cost and improving circuit reliability of aerospace
SAR.
Keywords—Under- and overvoltage protection; Aerospace
synthetic aperture radar system; Power Supply
I. INTRODUCTION
With the increasing demand for power supply, the high
voltage technic (above 100 Volts) has been widely used in
aerospace synthetic aperture radar (SAR) system[1]. As the
voltage increases, an effective input under- and overvoltage
protection circuit is indispensable to the power supply and
distribution system, which can prevent the damage to
components and electrical equipment caused by abnormal
supply voltage.
Traditional over- and undervoltage protection circuits
are generally composed of comparators, reference voltages
and switches[2,3]. Both the comparator and the reference
voltage require a low voltage power supply, so that an
auxiliary power converter must be applied, which
complicates the circuit structure. At the same time, the
prices of aerospace-grade radiation-resistant integrated
circuits are very expensive, which is not suitable for the
mass application. The switching threshold voltage of
MOSFETs is used in [4] as the reference voltage for under-
and overvoltage protection, but the switching threshold
voltage of MOSFET is significantly affected by temperature
[5], so that its consistency is difficult to guarantee. In
addition, the conventional UOVP circuits provides a
reversable protection, which often leads the system into an
unstable work mode nearby the protection point [6]. This
severely threatens the safety and reliability of the SAR
system.
In order to solve the above mentioned problems, this
paper provides a new type of integrated under-and
overvoltage protection technology for aerospace SAR
system. The technology realizes both of the undervoltage
and overvoltage protection for spaceflight power supply
system in one single circuit. In this circuit, the power
distribution switching MOSFET is turned off when the input
bus suffers ether an under- or an overvoltage, and it will not
be reconducted until the input bus is cut off and restarted,
which can avoid the oscillation at the protection point and
improve the operational reliability of the SAR system.
Meanwhile, the circuit structure is simple and the price of
employed components is cheap, which is beneficial to the
miniaturization and cost reduction of the SAR power supply
system.
II. THEORETICAL ANALYSIS
The new type of UOVP circuit consists of three parts as
shown in Fig. 1.
Vin+
R1
R2
R3
R4
R5
R6
R7
R8
R9
R10
R11
R12
Q1
Q2
Q3
Q4
D1
D2
D3
D4
D5
D6
D7
D8
D9
C1
C2
C3
GND
Main Circuit of
Power Supply
R13
(
I
)
(
II
)
(
III
)
(I): Over- and undervoltage protection point detection unit
(II): Interlock circuit
(III): Power switch control circuit and the residual voltage detection circuit
SW
Fig. 1 Diagram of the new type UOVP circuit
The part (I) is the over- and undervoltage protection
point detection circuit. The circuit includes resistors R
1
, R
2
,
R
13
, Zener diodes D
1
, D
3
and switching diode D
2
, which
determine the protection voltage threshold. The
undervoltage protection point V
u
is calculated by the divider
2022 3rd China International SAR Symposium (CISS) | 979-8-3503-9871-7/22/$31.00 ©2022 IEEE | DOI: 10.1109/CISS57580.2022.9971155
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