A power supply circuit for satellite-borne infrared detector

Abstract

The present invention discloses a power supply circuit of a satellite-borne infrared detector, comprising an input power supply, a main output power supply module, a timing control circuit and a detector load, wherein the input power supply is respectively connected to the main output power supply module and the timing control circuit; the main output power supply module is connected to the first detector load, the timing control circuit is composed of N-level timing control circuits connected in series, and the N-level timing control circuits are respectively connected to the second to M-th detector loads, wherein M‑N=1, N≥1; the timing control circuit comprises a clamping circuit, a voltage divider circuit and a voltage divider output power supply module; the output of the main power output module is also respectively connected to the voltage divider power supply output modules of each level of the timing control circuit. The power supply circuit of the satellite-borne infrared detector described in the present invention adopts an integrated, miniaturized and modular design, has the advantages of flexibility, high efficiency, simple operation, etc., and can effectively improve the reliability of use and extend the service life.

Description

Technical Field

[0001] The invention relates to the technical field of infrared information acquisition, and in particular to a power supply circuit of a satellite-borne infrared detector. Background Art

[0002] All objects emit thermal radiation related to their temperature and characteristics. The thermal radiation of room temperature objects is mostly in the infrared band. Infrared detectors convert invisible infrared radiation into measurable signals. They can detect, identify, analyze and control the infrared information of the detection target. They are the core key components for completing photoelectric conversion in aerospace remote sensing instruments and equipment. Once launched into space, it is almost impossible to maintain, repair and replace them. Infrared detectors extend the response cutoff wavelength, form working conditions, and reduce background noise. Most of them need to work at low temperatures. The radiation of the infrared instrument's own optical system and supporting structure is the main source of stray light. Therefore, for infrared instruments that detect weak targets, the optical system and related components need to be cooled to a certain degree to effectively reduce the background photon flux and reduce the background noise. Therefore, in practical applications, the sensitive components of the detector need to be placed under low temperature conditions to improve the performance of the detector. In the prior art, satellite-borne infrared detectors generally work in a low-temperature environment of 50K-100K. In this low-temperature environment, the requirements for the functions and structures of the detector's sensitive elements and integrated circuits are extremely strict, and higher requirements are also placed on the detector power supply method. The startup and shutdown of each detector element are often in a sequence. If the sequence is disordered, it will affect the internal configuration of the detector and easily destroy the normal operation of the detector and its infrared remote sensor in a low-temperature environment. In the prior art, the infrared detector elements of satellite-borne remote sensors mostly use a multi-level time-sharing sequential power-up and power-down power supply method. The input power of this power supply method is usually realized by a combination of multiple power modules, relays, and external control timing signals; however, in the prior art, the power modules used in satellite-borne remote sensors are usually very large in size, and multiple power modules occupy more space, resulting in a significant increase in the size of the remote sensor or even the satellite. In addition, the output efficiency of this multi-power module design is extremely low, and the relay has problems such as limited mechanical switch life and poor reliability, resulting in a short service life of the infrared detector. In addition, this power supply method also requires the addition of a complex control timing interface for external control of the timing signal. During ground testing, the sequence often does not meet the use requirements due to human operation, resulting in detector failure and other problems. Summary of the invention

[0003] To solve the above problems, the present invention proposes a power supply circuit and control method for a satellite-borne infrared detector, which realizes the integrated, miniaturized and modular design of the power supply circuit of the satellite-borne infrared detector. The power supply circuit is flexible, efficient, and easy to operate, and can effectively improve the reliability of use and extend the service life.

[0004] To this end, the present invention adopts the following technical solutions:

[0005] A power supply circuit for a satellite-borne infrared detector, such as Figure 1 As shown, it includes an input power supply, a main output power supply module, a timing control circuit and a detector load, and is characterized in that: the input power supply is respectively connected to the main output power supply module and the timing control circuit; the main output power supply module is connected to the first detector load, the timing control circuit is composed of the first level, the second level, ..., the N-1th level, and the Nth level timing control circuits connected in series, and the first level, the second level, ..., the N-1th level, and the Nth level timing control circuits are respectively connected to the second, ..., the M-1th, and the Mth detector loads, wherein MN=1, N≥1; the timing control circuit includes a clamping circuit, a voltage divider circuit and a voltage divider output power module; the input power is step-by-step regulated by the clamping circuit and the voltage divider circuit of each level of the timing control circuit, so as to obtain the enabling voltage threshold required for the operation of each level of the detector load, and then transmitted to the connected detector load through the voltage divider output power module; the output of the main power output module is also respectively connected to the voltage divider power output modules of each level of the timing control circuit.

[0006] The clamping circuit is composed of a voltage-stabilizing diode D and a resistor R; the voltage-dividing circuit is composed of a resistor R′, a resistor R″ and a capacitor C; during the detector load power-on process, the main output power module is kept in a power-on state, the input power input timing control circuit is input, the clamping circuit resistor R and the voltage-dividing circuit resistor R′ and the resistor R″ of each level of the timing control circuit are adjusted, and the voltage is gradually reduced from the first level of the timing control circuit to the Nth level of the timing control circuit according to a fixed voltage reduction amplitude, so that the power-on slope of each level of the timing control circuit is K1>K2>……>K N-1 >K N , wherein K1, K2, ..., K N-1 , K N They are the power-on slopes of the sequential control circuits from the 1st to the Nth level respectively; thereby obtaining the enabling voltage threshold required for the power-on operation of each level of detector load, and then transmitting it to the connected detector load through the voltage-dividing output power module.

[0007] Wherein, the clamping circuit is composed of a voltage stabilizing diode D and a resistor R; the voltage divider circuit is composed of a resistor R′, a resistor R″ and a capacitor C; during the power-off process of the detector load, the main output power module is kept in a powered-on state, the input power input timing control circuit is input, the clamping circuit resistor R and the voltage divider circuit resistor R′ and the resistor R″ of each level of the timing control circuit are adjusted, and the voltage is gradually increased from the Nth level of the timing control circuit to the first level of the timing control circuit according to a fixed boost amplitude, so that the power-off slope K′ of each level of the timing control circuit is N >K′ N-1> ... > K'2 > K'1, wherein K' N , K′ N-1 , ..., K′2, K′1 are respectively the power-off slopes of the sequential control circuits from the Nth stage to the 1st stage, thereby obtaining the enabling voltage threshold required for the power-off operation of each level of detector load, and then transmitting it to the connected detector load through the voltage-dividing output power supply module.

[0008] The present invention adopts the above technical scheme, adopts a single input power module, and performs integrated, miniaturized and modular design, with small space occupation requirements, which can effectively save the volume of remote sensors and satellites; at the same time, the voltage is adjusted step by step through the clamping circuit and the voltage divider circuit of the timing control circuit, so as to obtain the enabling voltage threshold required for the detector load to work, and then transmitted to the satellite-borne detector loads at each level through the voltage divider output power module, so as to realize the time-sharing sequential power-on and reverse power-off functions of multiple loads, automatic control, flexibility, high efficiency, simple operation, and no need to set up a complicated control timing interface circuit externally for external control of the timing signal, which reduces the possibility of many ground test failures and ensures the reliability and life of the satellite-borne detector load in orbit. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 This is a schematic diagram of the structure of the power supply circuit of the satellite-borne infrared detector.

[0010] Figure 2 It is a schematic diagram of the power supply circuit of the satellite-borne infrared detector in a specific implementation manner.

[0011] Figure 3 It is a schematic diagram of the relationship between voltage and time when the power supply circuit of the satellite-borne infrared detector controls power on and off in a specific implementation manner. DETAILED DESCRIPTION

[0012] In order to make the purpose, features and advantages of the present invention clearer, a specific implementation of the present invention is described in more detail. In the following description, many specific details are elaborated to facilitate a full understanding of the present invention, but the present invention can be implemented in many other ways different from the description. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0013] according to Figure 1The power supply circuit of the satellite-borne infrared detector of the present invention is shown. The following is a specific implementation description taking the satellite-borne infrared detector loads that need to be powered as M=4 as an example. For this purpose, the timing control circuit is designed to include N=3-level timing control circuits connected in series. The main output power module is connected to the first detector load, and the 3-level timing control circuits are respectively connected to the second detector load, the third detector load and the fourth detector load. The clamping circuit is composed of a voltage-stabilizing diode D and a resistor R; the voltage divider circuit is composed of a resistor R′, a resistor R″ and a capacitor C; the output of the main power output module is also connected to the voltage divider power output modules of each level respectively. The timing control circuit includes a clamping circuit, a voltage divider circuit and a voltage divider output power module; the input power is step-by-step regulated by the clamping circuit and the voltage divider circuit of each level of the timing control circuit, so as to obtain the enabling voltage threshold required for the operation of each level of the detector load, and then transmitted to the connected detector load through the voltage divider output power module; the output of the main power output module is also respectively connected to the voltage divider power output modules of each level of the timing control circuit.

[0014] The enabling voltage thresholds required for the first, second and third detector loads to work are E1, E2 and E3 respectively, where E1>E2>E 3。

[0015] Wherein, the clamping circuit is composed of a voltage-stabilizing diode D and a resistor R; the voltage-dividing circuit is composed of a resistor R′, a resistor R″ and a capacitor C; during the power-on process of the detector load, the main output power supply module is kept in a power-on state, the input power input timing control circuit is input, the clamping circuit resistor R and the voltage-dividing circuit resistor R′ and the resistor R″ of each level of the timing control circuit are adjusted, and the voltage is gradually reduced from the first level of the timing control circuit to the third level of the timing control circuit according to a fixed voltage reduction amplitude, so that the power-on slope of each level of the timing control circuit is K1>K2>K3, wherein K1, K2, and K3 are the power-on slopes of the timing control circuits from the first level to the third level respectively; thereby obtaining the enabling voltage threshold required for the power-on operation of each level of the detector load, and then transmitting it to the connected detector load through the voltage-dividing output power supply module.

[0016] Wherein, the clamping circuit is composed of a voltage-stabilizing diode D and a resistor R; the voltage-dividing circuit is composed of a resistor R′, a resistor R″ and a capacitor C; during the power-off process of the detector load, the main output power supply module is kept in a power-on state, the input power input timing control circuit is input, the clamping circuit resistor R and the voltage-dividing circuit resistor R′ and the resistor R″ of each level of the timing control circuit are adjusted, and the voltage is gradually boosted from the third level of the timing control circuit to the first level of the timing control circuit according to a fixed boost amplitude, so that the power-off slope of each level of the timing control circuit is K′3>K′2>K′1, wherein K′3, K′2, and K′1 are respectively the power-off slopes of the timing control circuits from the third level to the first level, thereby obtaining the enabling voltage threshold required for the power-off operation of each level of the detector load, and then transmitted to the connected detector load through the voltage-dividing output power supply module.

[0017] by Figure 2 For example, during the power-on process of the detector load, the input power supply voltage is given to the timing control circuit and the main output power supply module MSK5130 (i.e., U1), and the main output power supply module MSK5130 is connected to the first detector load; the timing control circuit is composed of three-level timing control circuits connected in series, wherein the timing control circuit includes a clamping circuit, a voltage divider circuit and a voltage divider output power supply module, and the clamping circuit is composed of a voltage zener diode D and a resistor R; the voltage divider circuit is composed of a resistor R′, a resistor R″ and a capacitor C, and the output of the voltage divider circuit is connected to the enable EN terminal of MSK5130 in the power management circuit. The input and enable EN of the first MSK5130 (i.e., U1) are connected together; the inputs of the second MSK5130 (i.e., U2), the third MSK5130 (i.e., U3) and the fourth MSK5130 (i.e., U4) are connected to the output of the first MSK5130 (i.e., U1).

[0018] The input power supply voltage is given to the timing control circuit and the main output power supply module MSK5130 (i.e., U1), and the main output power supply module MSK5130 (i.e., U1) is kept in a powered-on state. The input power supply input timing control circuit adjusts the clamp circuit resistance R and the voltage divider circuit resistance R′ and the resistance R″ of each level of the timing control circuit, and keeps the main output power module in a powered-on state. The input power supply input timing control circuit adjusts the clamp circuit resistance R and the voltage divider circuit resistance R′ and the resistance R″ of each level of the timing control circuit, and performs step-by-step voltage reduction from the first level of the timing control circuit to the third level of the timing control circuit according to a fixed voltage reduction amplitude, so that the power-on slope K1 of each level of the timing control circuit is greater than K2 and greater than K3, wherein K1, K2, and K3 are respectively the power-on slopes of the timing control circuits from the first level to the third level; thereby obtaining the enabling voltage threshold required for the power-on operation of the detector load at each level, and then transmitting it to the connected detector load through the voltage divider output power supply module. The voltage divider circuit sets different voltage thresholds according to the enable voltage of the MSK5130 in each level of the voltage divider output power module. When this threshold is reached, the enable voltage of the MSK5130 is met. Figure 3As shown, the first-stage timing control circuit meets the working enable voltage of MSK5130 (U2) in the first-stage voltage-dividing output power module only when the threshold value V1 is reached, and the power-on time is t1; the second-stage timing control circuit meets the working enable voltage of MSK5130 (U3) in the second-stage voltage-dividing output power module only when the threshold value V2 is reached, and the power-on time is t2; the third-stage timing control circuit meets the working enable voltage of MSK5130 (U3) in the third-stage voltage-dividing output power module only when the threshold value V3 is reached. 5130 (U4) working enable voltage, at this time the power-on time is t3; wherein, V1<V2<V3, each level of voltage threshold can be changed by adjusting the resistance (R′, R″) of each level of voltage divider circuit and the size of the capacitor C, the charge and discharge of the bypass capacitor in the voltage divider circuit has the effect of extending the power-on interval; during the power-on process, the threshold of each level of voltage is different, and the power-on time is also different, so t1<t2<t3; that is, U2 starts working first, U3 starts working second, and U4 starts working last. Then it starts to work; at this time, the power-on interval is in the millisecond level (tens of milliseconds to hundreds of milliseconds). Similarly, during the power-off process, the voltage is given to the timing control circuit and the main output power module MSK5130 (i.e. U1), keeping the main output power module MSK5130 (i.e. U1) in the power-on state, and the input power input timing control circuit is gradually boosted through the 3rd, 2nd, and 1st level timing control circuits. The boost range is about 3V to 4V. This boost can be adjusted according to the resistance (R, R′, R″), and the voltage is divided into During the power-off process, the timing control circuit maintains the power-off slope K′3>K′2>K′1 of the divided timing control circuit, wherein K′3, K′2, and K′1 are respectively the power-off slopes of the divided timing control circuit from level 3 to level 1, and the power-off enabling voltage threshold required for each onboard detector load is obtained. The voltage divider circuit sets different voltage thresholds according to the enabling voltage of the MSK5130 in each level of the voltage divider output power module. When this threshold is reached, the enabling voltage of the MSK5130 is satisfied. Figure 3As shown, the third-stage timing control circuit meets the working enable voltage of MSK5130 (U4) in the third-stage voltage-dividing output power module only when the threshold value V'3 is reached, and the power-off time is t'3; the second-stage timing control circuit meets the working enable voltage of MSK5130 (U3) in the second-stage voltage-dividing output power module only when the threshold value V'2 is reached, and the power-off time is t'2; the first-stage timing control circuit meets the working enable voltage of MSK5130 (U4) in the first-stage voltage-dividing output power module only when the threshold value V'1 is reached, and the power-off time is t'2. The moment of power-on is t′1; wherein, V′3>V′2>V′1, the voltage threshold of each level can be changed by adjusting the resistance (R′, R″) and the capacitance C of each level of the voltage divider circuit, and the charging and discharging of the bypass capacitor in the voltage divider circuit has the effect of extending the power-off interval; in the power-off process, the threshold value of each level of voltage is different, and the power-off moment is also different, so t′3>t′2>t′1; U4 starts to power off first, then U3, then U2, and finally U1; at this time, the power-off interval is in milliseconds (tens of milliseconds to hundreds of milliseconds).

[0019] The present invention controls the power-on and power-off sequence of MSK5130 (U1-U4) in the main output power supply module and the voltage-dividing output power supply module, thereby realizing the function of controlling multiple power supplies to have the power-on sequence in time-sharing order and the power-off sequence in reverse order. A single input power supply module is adopted for integrated, miniaturized and modular design, which requires little space and can effectively save the volume of remote sensors and satellites. The present invention is flexible, efficient and easy to operate, and does not require the external setting of complicated control timing interface circuits for external control of timing signals, thereby reducing the possibility of many ground test failures and ensuring the reliability and life of the on-orbit operation of the satellite-borne detector load.

[0020] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A power supply circuit for a satellite-borne infrared detector, comprising an input power supply, a main output power supply module, a timing control circuit and a detector load, characterized in that: The input power supply is respectively connected to the main output power supply module and the timing control circuit; the main output power supply module is connected to the first detector load, the timing control circuit is composed of the first level, the second level, ..., the N-1th level, and the Nth level timing control circuits connected in series, and the first level, the second level, ..., the N-1th level, and the Nth level timing control circuits are respectively connected to the second, ..., the M-1th, and the Mth detector loads, wherein MN=1, N≥1; the timing control circuit includes a clamping circuit, a voltage divider circuit and a voltage divider output power supply module; the input power is step-by-step regulated by the clamping circuit and the voltage divider circuit of each level of the timing control circuit, so as to obtain the enabling voltage threshold required for the operation of each level of the detector load, and then transmitted to the connected detector load through the voltage divider output power supply module; the output of the main power output module is also respectively connected to the voltage divider power supply output modules of each level of the timing control circuit.

2. The power supply circuit of a satellite-borne infrared detector according to claim 1, characterized in that: The clamping circuit in the timing control circuit is composed of a voltage-stabilizing diode D and a resistor R; the voltage-dividing circuit is composed of a resistor R′, a resistor R″ and a capacitor C; during the detector load power-on process, the main output power module is kept in a power-on state, the input power is input to the timing control circuit, the clamping circuit resistor R and the voltage-dividing circuit resistor R′ and the resistor R″ of each level of the timing control circuit are adjusted, and the voltage is gradually reduced from the first level of the timing control circuit to the Nth level of the timing control circuit according to a fixed voltage reduction amplitude, so that the power-on slope of each level of the timing control circuit is K1>K2>……>K N-1 >K N , wherein K1, K2, ..., K N-1 , K N They are the power-on slopes of the sequential control circuits from the 1st to the Nth level respectively; thereby obtaining the enabling voltage threshold required for the power-on operation of each level of detector load, and then transmitting it to the connected detector load through the voltage-dividing output power module.

3. The power supply circuit of a satellite-borne infrared detector according to claim 2, characterized in that: During the power-off process of the detector load, the main output power module is kept in the power-on state, the input power input timing control circuit is input, the clamping circuit resistance R and the voltage divider circuit resistance R′ and the resistance R″ of each level of the timing control circuit are adjusted, and the voltage is gradually increased from the Nth level of the timing control circuit to the first level of the timing control circuit according to the fixed boost amplitude, so that the power-off slope K of each level of the timing control circuit is ′ N >K ′ N-1 >……>K ′ 2>K ′ 1, wherein the K ′ N , K ′ N-1 ,……,K ′ 2. K ′ 1 are the power-off slopes of the sequential control circuits from the Nth stage to the 1st stage, thereby obtaining the enabling voltage thresholds required for the power-off operation of the detector loads at each stage, which are then transmitted to the connected detector loads through the voltage-dividing output power supply module.

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