Current source adjusting circuit and method
By using a current source regulation circuit of a low-voltage MOS shunt and a low-voltage current source connected in series in aerospace power supplies, the problem of difficulty in adjusting high-voltage and high-power loads in the existing technology is solved, and the high-voltage output is controlled by low-voltage devices, which is suitable for high-power density applications of new aerospace equipment.
Patent Information
- Application Number
- CN202411888491.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-20
- Publication Date
- 2025-03-28
AI Technical Summary
When existing aerospace power supplies face the diversified load characteristics of new high-precision aerospace equipment, it is difficult to effectively adjust the current to meet the needs of high-voltage and high-power loads, and the method of increasing the voltage level is limited by the insulation spacing and device voltage withstand value.
The current source regulation circuit consisting of a low-voltage MOS shunt, a current limiting inductor and a diode is used to control the high voltage output of the low-voltage current sources CS1 and CS2 connected in series.
It realizes the use of low-voltage devices to output high-voltage buses, which is suitable for high-power density applications of aerospace power supplies, reducing the difficulty and cost of thermal control of the whole satellite system.
Smart Images
Figure CN119717979A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a space power supply, and in particular to a current source regulating circuit and method. Background Art
[0002] Conventional sequential shunt circuits such as Figure 1 As shown, the shunt tube M1 (SI-MOS) is responsible for regulating the power of the windsurfing board SA1 and is controlled by a unified controller. When the energy is sufficient, M1 short-circuits the energy of SA1 to the ground. When energy is needed, M1 is disconnected to allow SA1 to discharge to the bus through the inductor L1 and the diode D1. This topology has been fully applied to the current 100V and 42V bus PCUs.
[0003] With the development and expansion of aerospace technology and applications, especially the requirements of new high-precision aerospace equipment, the load characteristics of spacecraft are becoming more diversified. The new generation of aerospace equipment represented by space reconnaissance, monitoring, early warning and space security, such as high temporal and spatial resolution radar satellites, multi-payload integrated satellites, etc., has the characteristics of multiple high-voltage and high-power payloads coexisting, instantaneous ultra-high power, and high repetition frequency. PCU (spacecraft power controller) is one of the heavier components in the whole satellite. Higher power density means lower weight, which effectively reduces the difficulty and cost of the whole satellite system design.
[0004] Increasing power can be achieved by increasing current or voltage. The means of increasing current will be limited by the current-carrying capacity and thermal design of the PCB itself, while the means of increasing voltage level will be limited by the reduction of insulation spacing under vacuum and low atmospheric pressure and the withstand voltage value of the device itself. The problem of increased heat generation caused by increasing current level can only be solved by enhancing heat dissipation measures, which will only increase the thermal control volume and control difficulty of the entire satellite. However, with the rapid development of insulation means and insulation materials, it has become possible to increase the voltage level of the entire satellite.
[0005] The excellent performance of aerospace-grade high-power SI-MOS is widely used in applications with a voltage level of 100V. The maximum power of a single S3R is 1.8kW. In 2012, ESA proposed a plan to increase the satellite bus to 300V. The bus solution at this voltage can effectively reduce the size of the electric propulsion power supply (PPU) as a secondary power source, and allow satellites to use higher-power electric propulsion.
[0006] When the output current remains unchanged, the bus voltage is increased to 300V, and the maximum output power of a single S3R can be increased to 5.4kW. Taking the MOS produced by the domestic 771 as an example, as shown in Table 1, the drain-source voltage, drain-source resistance and drain-source continuous current of the MOS model that can be selected for 300V bus applications are significantly reduced compared to the MOS tube performance in 100V applications, and are not suitable for high-voltage and high-power applications. Therefore, if low-voltage devices can be used to output high voltage, it is more suitable for current aerospace power applications.
[0007] Table 1 MOS tube performance comparison table
[0008] Summary of the invention
[0009] In order to solve the problems in the prior art, the present invention provides a current source regulation circuit and method.
[0010] The present invention provides a current source regulation circuit, comprising a low-voltage MOS shunt tube M1, a current limiting inductor L1 and a diode D1, and also comprising a low-voltage current source CS1 and a low-voltage current source CS2 connected in series, one end of the low-voltage current source CS1 is grounded, the other end of the low-voltage current source CS1 is connected to one end of the low-voltage current source CS2, the other end of the low-voltage current source CS2 is connected to the anode of the diode, the cathode of the diode D1 is connected to a bus, the gate of the low-voltage MOS shunt tube M1 is connected to the output end of a controller, the source of the low-voltage MOS shunt tube M1 is grounded, the drain of the low-voltage MOS shunt tube M1 is connected to one end of the current limiting inductor L1, and the other end of the current limiting inductor L1 is connected between the low-voltage current source CS1 and the low-voltage current source CS2.
[0011] As a further improvement of the present invention, the current source regulation circuit further includes a bus capacitor C BUS , the cathode of the diode D1 and the bus capacitor C BUS One end of the bus capacitor C BUS The other end is grounded.
[0012] As a further improvement of the present invention, the low-voltage current source CS1 and the low-voltage current source CS2 are both 150V current sources.
[0013] As a further improvement of the present invention, the low-voltage MOS shunt tube M1 adopts a space-grade high-power SI-MOS tube.
[0014] The present invention also provides a current source regulation method, which enables a low voltage device to control a high voltage output through the current source regulation circuit.
[0015] As a further improvement of the present invention, when the low-voltage MOS shunt tube M1 is turned off, the low-voltage current source CS1 and the low-voltage current source CS2 are output to the bus through the diode D1, and the bus voltage is equal to the sum of the voltages of the low-voltage current source CS1 and the low-voltage current source CS2. At this time, the voltage on the low-voltage MOS shunt tube M1 is equal to the voltage of the low-voltage current source CS1; when the low-voltage MOS shunt tube M1 is turned on, the low-voltage current source CS1 is short-circuited to the ground through the current-limiting inductor L1 and the low-voltage MOS shunt tube M1. At this time, the voltage of the low-voltage current source CS1 is a short-circuit voltage, the bus voltage is equal to the sum of the voltages of the low-voltage current source CS1 and the low-voltage current source CS2, which is less than the bus voltage, the diode D1 is reversely cut off, and the low-voltage current source CS2 operates in an open circuit state.
[0016] The beneficial effects of the present invention are: providing a current source regulation circuit and method, using a simple and efficient shunt topology, using a low-voltage MOS to control the output of a high-voltage bus, and being more suitable for current aerospace power supply applications. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other solutions can be obtained based on these drawings without paying creative work.
[0018] Figure 1 It is a traditional sequential shunt circuit diagram.
[0019] Figure 2 It is a circuit diagram of a current source regulating circuit of the present invention.
[0020] Figure 3 This is the simulation waveform. DETAILED DESCRIPTION
[0021] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.
[0022] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.
[0023] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.
[0024] The present invention will be further described below in conjunction with the accompanying drawings and specific implementation methods.
[0025] The specific implementation method of the S3R solution for achieving high voltage output with low voltage devices is as follows: Figure 2 As shown, a current source regulation circuit includes a low-voltage MOS shunt tube M1, a current limiting inductor L1 and a diode D1, and also includes a low-voltage current source CS1 and a low-voltage current source CS2 connected in series, one end of the low-voltage current source CS1 is grounded, the other end of the low-voltage current source CS1 is connected to one end of the low-voltage current source CS2, the other end of the low-voltage current source CS2 is connected to the anode of the diode, the cathode of the diode D1 is connected to the bus, the gate of the low-voltage MOS shunt tube M1 is connected to the output end of the controller, the source of the low-voltage MOS shunt tube M1 is grounded, the drain of the low-voltage MOS shunt tube M1 is connected to one end of the current limiting inductor L1, and the other end of the current limiting inductor L1 is connected between the low-voltage current source CS1 and the low-voltage current source CS2.
[0026] The current source regulation circuit also includes a bus capacitor C BUS , the cathode of the diode D1 and the bus capacitor C BUS One end of the bus capacitor C BUS The other end is grounded.
[0027] The low voltage current source CS1 and the low voltage current source CS2 are both 150V current sources.
[0028] The low-voltage MOS shunt tube M1 is a space-grade high-power SI-MOS tube.
[0029] A current source regulation method realizes low voltage device controlling high voltage output through the current source regulation circuit.
[0030] When the low-voltage MOS shunt tube M1 is turned off, the low-voltage current sources CS1 and CS2 are output to the bus through the diode D1, and the bus voltage can be equal to the sum of the two (150V*2). At this time, the voltage on the low-voltage MOS shunt tube M1 should be equal to the voltage value of CS1; when the low-voltage MOS shunt tube M1 is turned on, the low-voltage current source CS1 is short-circuited to the ground through the current-limiting inductor L1 and the low-voltage MOS shunt tube M1. At this time, the voltage of the low-voltage current source CS1 is a short-circuit voltage (<1V), the voltage value of CS2+CS1 is less than the bus voltage value, the diode D1 is reversely cut off, and CS2 works in an open circuit state.
[0031] The output end of the controller is connected to the gate of the low-voltage MOS shunt tube M1, and the input end of the controller is respectively connected to the MEA signal and the REF signal. The judgment and conduction of the low-voltage MOS shunt tube M1 can be controlled by a unified controller. MEA is the abbreviation of Main Error Amplifer, the main error amplifier, the MEA signal is the main error amplifier signal, and the REF signal is the reference signal.
[0032] Simulation verification data:
[0033] The voltage stress on the low voltage MOS shunt tube M1 is as follows: Figure 3 As shown, the bus output voltage is 300V, but the maximum voltage between the drain and source of M1 is only 160V. The bus can be regulated by using the LCS7583U2RH of 771 factory mentioned above.
[0034] The current source regulation circuit and method provided by the present invention have the following advantages:
[0035] 1. Control the high voltage output through a low voltage device (i.e. low voltage MOS shunt tube M1);
[0036] 2. The shunt system has high reliability and high power density output.
[0037] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.
Claims
1. A current source regulation circuit, comprising a low voltage MOS shunt tube M1, a current limiting inductor L1 and a diode D1, characterized in that: It also includes a low-voltage current source CS1 and a low-voltage current source CS2 connected in series, one end of the low-voltage current source CS1 is grounded, the other end of the low-voltage current source CS1 is connected to one end of the low-voltage current source CS2, the other end of the low-voltage current source CS2 is connected to the anode of the diode, the cathode of the diode D1 is connected to the bus, the gate of the low-voltage MOS shunt tube M1 is connected to the output end of the controller, the source of the low-voltage MOS shunt tube M1 is grounded, the drain of the low-voltage MOS shunt tube M1 is connected to one end of the current limiting inductor L1, and the other end of the current limiting inductor L1 is connected between the low-voltage current source CS1 and the low-voltage current source CS2.
2. The current source regulating circuit according to claim 1, characterized in that: The current source regulation circuit also includes a bus capacitor C BUS , the cathode of the diode D1 and the bus capacitor C BUS One end of the bus capacitor C BUS The other end is grounded.
3. The current source regulating circuit according to claim 1, characterized in that: The low voltage current source CS1 and the low voltage current source CS2 are both 150V current sources.
4. The current source regulating circuit according to claim 1, characterized in that: The low-voltage MOS shunt tube M1 is a space-grade high-power SI-MOS tube.
5. A current source regulation method, characterized in that: The current source regulating circuit according to any one of claims 1 to 4 is used to realize that a low voltage device controls a high voltage output.
6. The current source regulation method according to claim 5, characterized in that: When the low-voltage MOS shunt tube M1 is turned off, the low-voltage current source CS1 and the low-voltage current source CS2 are output to the bus through the diode D1, and the bus voltage is equal to the sum of the voltages of the low-voltage current source CS1 and the low-voltage current source CS2. At this time, the voltage on the low-voltage MOS shunt tube M1 is equal to the voltage of the low-voltage current source CS1; when the low-voltage MOS shunt tube M1 is turned on, the low-voltage current source CS1 is short-circuited to the ground through the current-limiting inductor L1 and the low-voltage MOS shunt tube M1. At this time, the voltage of the low-voltage current source CS1 is a short-circuit voltage, the bus voltage is equal to the sum of the voltages of the low-voltage current source CS1 and the low-voltage current source CS2, which is less than the bus voltage, the diode D1 is reversely cut off, and the low-voltage current source CS2 works in an open circuit state.